CN211361283U

CN211361283U - Nut screwing device and nut screwing mechanism thereof

Info

Publication number: CN211361283U
Application number: CN201921880076.2U
Authority: CN
Inventors: 古小兵; 胡振华; 黄国君; 易钢杨
Original assignee: Yuanmeng Precision Technology Shenzhen Institute
Current assignee: Yuanmeng Precision Technology Shenzhen Institute
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-08-28
Anticipated expiration: 2029-11-01

Abstract

The utility model belongs to the technical field of the fastener, especially, relate to a twist nut device and twist nut mechanism thereof. The nut screwing mechanism comprises a mounting seat, a sleeve and a rotary driving piece, wherein the sleeve is mounted on the mounting seat and used for being matched with the nested nut, the rotary driving piece is used for driving the sleeve to rotate so as to provide screwing torque, a nested part used for being matched with the nested nut is arranged at one end, far away from the mounting seat, of the sleeve, a power output shaft of the rotary driving piece is in driving connection with the sleeve, and the sleeve is driven to rotate around the axis of the sleeve, so that the nested part drives the nut to rotate and screw the nut. The nut screwing operation is mechanized, the automation degree is high, the labor intensity of operators can be effectively reduced, and the operation efficiency is improved; in the process of screwing the nut, the screwing torque applied to the nut can be controlled by controlling the power output of the rotary driving piece, so that the screwing torque is matched with the torque required by screwing the nut, and the situation that the nut is damaged by overlarge torque or is not screwed in place by undersized torque is avoided when the nut is screwed.

Description

Nut screwing device and nut screwing mechanism thereof

Technical Field

The utility model belongs to the technical field of the fastener, especially, relate to a twist nut device and twist nut mechanism thereof.

Background

In the field of mechanical engineering, nuts are very common fasteners, which are often used in conjunction with bolts or screws; when the nut is used, the nut needs to be screwed down by means of external force, so that the fastening effect can be achieved. In the prior art, a hook head wrench is often adopted to perform screwing operation, and during operation, an operator holds the hook head wrench to manually screw a nut, so that the labor intensity of manual operation is high, and the operation efficiency is low. In addition, when the nut is screwed up manually, the screwing torque acting on the nut cannot be accurately controlled, and an operator judges whether the nut is screwed up or not by experience, so that the nut is often screwed up incompletely due to inaccurate prejudgment, or the nut is damaged by sliding threads due to excessive force application.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a twist nut device and twist nut mechanism thereof aims at solving prior art and adopts the manual nut intensity of labour of twisting of gib head spanner big, the low and technical problem who screws up the unable control of moment of torsion of operating efficiency.

In order to achieve the above object, the utility model adopts the following technical scheme: a nut screwing mechanism comprises a mounting seat, a sleeve and a rotary driving piece, wherein the sleeve is mounted on the mounting seat and used for being matched with a nested nut, the rotary driving piece is used for driving the sleeve to rotate so as to provide screwing torque, a nested portion used for being matched with the nested nut is arranged at one end, away from the mounting seat, of the sleeve, and a power output shaft of the rotary driving piece is in driving connection with the sleeve and is used for driving the sleeve to rotate around the axis of the sleeve, so that the nested portion drives the nut to rotate and screw the nut.

Furthermore, the nut screwing mechanism further comprises a transmission assembly, the transmission assembly comprises a driving gear, a driven gear and a transmission shaft, the driving gear is connected with a power output shaft of the rotary driving piece, and the nut screwing mechanism further comprises a driving gear, a driven gear and a transmission shaft

Driven gear with the driving gear meshing is connected, the transmission shaft with the sleeve all has relative first end and second end, nested portion set up in telescopic first end, driven gear cup joints in the first end of transmission shaft, telescopic second end with the second end of transmission shaft is connected.

Further, the mount pad includes mounting panel and installation section of thick bamboo, rotary driving spare install in on the mounting panel, the driving gear with driven gear rotate along the horizontal direction install in on the mounting panel, the mounting panel is just right driven gear's position department has seted up connect the hole, the installation section of thick bamboo is fixed in the below of mounting panel, the transmission shaft is worn to locate in the installation section of thick bamboo, the first end of transmission shaft is followed connect the hole wear out with driven gear cup joints, telescopic first end is followed the installation section of thick bamboo deviates from the tip of mounting panel stretches out, the transmission shaft can be in under the exogenic action in the installation section of thick bamboo along self axis direction reciprocating motion from top to bottom, thereby drive the sleeve reciprocating motion from top to bottom so that nested portion is nested or breaks away from the nut.

Further, the transmission assembly further comprises a spline nut, a first bearing and a second bearing, the first bearing is fixedly embedded in the connecting through hole, the spline nut is sleeved at the first end of the transmission shaft, the spline nut and the transmission shaft form a ball spline, the spline nut penetrates through the first bearing and is fixed with an inner ring of the first bearing, one end of the spline nut extends out of the mounting plate and is in key connection with the driven gear, the second bearing is fixedly embedded in the mounting barrel, and the other end of the spline nut extends out of the connecting through hole and is fixed with an inner ring of the second bearing so as to be rotatably connected with the mounting barrel through the second bearing.

Further, the second end of transmission shaft with telescopic second end is connected through the transmission connecting piece, the transmission connecting piece includes first connector, second connector and link, first connector connect in the second end of transmission shaft, the second connector connect in telescopic second end, the second connector passes through the link with first connector rotates to be connected, thereby makes the sleeve can be relative the transmission shaft rotates.

Furthermore, the lateral wall of the connecting joint is convexly provided with a first connecting shaft and a second connecting shaft which are arranged in a cross manner, the first connecting shaft is connected with the connecting joint in a rotating manner through the first connecting shaft, the second connecting shaft is connected with the connecting joint in a rotating manner through the second connecting shaft, and the first connecting shaft, the connecting joint and the second connecting joint form a universal joint structure together.

Furthermore, the nut screwing mechanism further comprises a positioning assembly for limiting the sleeve to be coaxially connected with the transmission shaft, the positioning assembly comprises an elastic positioning piece which is coaxially arranged with the transmission shaft and sleeved outside the transmission shaft, one end of the elastic positioning piece is connected with the transmission shaft, and the other end of the elastic positioning piece is connected with the sleeve and elastically pushes against the sleeve, so that the axis of the sleeve and the axis of the transmission shaft are kept coincident.

Furthermore, the elastic positioning element is a spring sleeved outside the transmission shaft, the positioning assembly further comprises a first spring fixing seat and a second spring fixing seat, the appearance profile of the positioning assembly is adapted to the first spring fixing seat and the second spring fixing seat of the installation cylinder, the first spring fixing seat is sleeved at the second end of the transmission shaft, the second spring fixing seat is sleeved at the second end of the sleeve, two ends of the spring are respectively embedded in the first spring fixing seat and the second spring fixing seat, the transmission shaft drives the first spring fixing seat and the second spring fixing seat to ascend to a preset position, and the first spring fixing seat and the second spring fixing seat are both contained in the installation cylinder.

Furthermore, the rotary driving part comprises a driving motor and a speed reducer, an output shaft of the driving motor is connected with an input shaft of the speed reducer, an output shaft of the speed reducer is connected with a rotating shaft of the driving gear, the speed reducer is installed on the installation plate through a speed reducer fixing seat, and the driving gear is contained in the speed reducer fixing seat.

The utility model provides an above-mentioned one or more technical scheme in the nut screwing mechanism have one of following technological effect at least: during the use, move the sleeve to making nested portion and nut nested connection, afterwards, restart the rotary driving piece and provide the tightening torque, the power output shaft drive sleeve of rotary driving piece is rotatory around self axis, and the sleeve is rotatory can drive the nut rotation of nesting in nested portion simultaneously to tighten the nut, it can to break away from the nut to move the sleeve to nested portion after the nut is tightened again. Therefore, the nut screwing mechanism can realize automatic screwing of the nut, the nut screwing operation is mechanized and has high automation degree, the labor intensity of operators can be effectively reduced, and the operation efficiency is improved; in addition, in the process of screwing the nut, the screwing torque applied to the nut can be controlled by controlling the power output magnitude of the rotary driving piece, the torque output magnitude of the rotary driving piece is set before operation, the rotary driving piece is matched with the torque required by screwing the nut, the rotary driving piece can be automatically stopped after the rotary driving piece drives the sleeve to act on the specified torque to the nut, the situation that the nut is damaged due to overlarge torque or the nut is not screwed in place due to undersize torque is avoided, the screwed nut is not easy to loosen, and the fastening connection is more stable and reliable.

The utility model discloses another technical scheme is: a nut screwing device comprises the nut screwing mechanism.

The utility model discloses a screw up nut device, owing to used foretell screw up nut mechanism, it can realize the automation mechanized operation that the nut was screwed up, thereby effectively reduce operation personnel's intensity of labour, improve the operating efficiency, and, it can also be through the power take off size of control rotary driving piece, thereby the screwing up moment of torsion for the nut is applyed in control, when screwing up the nut, can not appear because the too big damage nut of moment of torsion, or the too big not in place condition of screwing up of moment of torsion undersize nut, the nut after screwing up is difficult not hard up, fastening connection is more reliable and more stable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural view of a nut screwing mechanism provided in an embodiment of the present invention;

FIG. 2 is an exploded schematic view of the nut runner mechanism shown in FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 4 is a partially exploded schematic view of the nut runner mechanism shown in FIG. 1;

fig. 5 is a schematic view of the structure of a socket of the nut runner mechanism shown in fig. 1.

Wherein, in the figures, the respective reference numerals:

10-sleeve 11-nested part 20-rotary driving piece

21-power output shaft 22-driving motor 23-speed reducer

30-mounting seat 31-mounting plate 32-mounting cylinder

40-transmission assembly 41-driving gear 42-driven gear

43-transmission shaft 44-transmission connecting piece 45-spline nut

46-first bearing 47-second bearing 50-positioning assembly

51-elastic positioning piece 52-first spring fixing seat

53-second spring fixing seat 111-annular abutting wall 311-connecting through hole

431-anti-slip pin 441-first connector 442-second connector

443-connecting joint 2311-speed reducer fixing seat 4411-first connecting hole

4412 first connecting lug 4421 second connecting lug 4422 second connecting lug

4431-first connecting shaft 4432-second connecting shaft.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-5 are exemplary and intended to be used to illustrate the invention, but should not be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in fig. 1-5, an embodiment of the utility model provides a screw nut mechanism is applicable to and installs and overhauls etc. to the nut on the mechanical structure, is particularly useful for needing to use the nut that big moment of torsion could screw up, like the moment of torsion more than 150NM etc.. Specifically, the nut screwing mechanism comprises a mounting seat 30, a sleeve 10 which is mounted on the mounting seat 30 and is used for adapting to a nested nut, and a rotary driving piece 20 which is used for driving the sleeve 10 to rotate so as to provide screwing torque, wherein a nesting part 11 which is used for adapting to the nested nut is arranged at one end, away from the mounting seat 30, of the sleeve 10, and a power output shaft 21 of the rotary driving piece 20 is in driving connection with the sleeve 10 and is used for driving the sleeve 10 to rotate around the axis of the sleeve 10 so that the nesting part 11 drives the nut to rotate and screw the nut.

The utility model discloses screw up nut mechanism, during the use, remove sleeve 10 to making nested portion 11 and nut nested connection, afterwards, restart rotary driving piece 20 provides the tightening torque, and rotary driving piece 20's power output shaft 21 drives sleeve 10 rotatory around self axis, and sleeve 10 is rotatory can drive the nut rotation nested in nested portion 11 simultaneously to screw up the nut, move sleeve 10 to nested portion 11 after the nut is screwed up again and break away from the nut can. Therefore, the nut screwing mechanism can realize automatic screwing of the nut, the nut screwing operation is mechanized and has high automation degree, the labor intensity of operators can be effectively reduced, and the operation efficiency is improved; in addition, in the process of screwing the nut, the screwing torque applied to the nut can be controlled by controlling the power output magnitude of the rotary driving piece 20, the torque output magnitude of the rotary driving piece 20 is set before operation, so that the torque output magnitude is matched with the torque required by screwing the nut, after the rotary driving piece 20 drives the sleeve 10 to apply the specified torque to the nut, the rotary driving piece 20 can be automatically stopped, the situation that the nut is damaged due to overlarge torque or the nut is not screwed in place due to undersize torque can be avoided, the screwed nut is not easy to loosen, and the fastening connection is more stable and reliable.

Specifically, in the present embodiment, the rotary drive 20 may be a rotary drive 20 including a servo motor, etc., and when in use, the rotation speed of the servo motor is set according to the torque required for tightening the nut, so that the tightening torque can be automatically controlled to provide a torque suitable for tightening the nut.

More specifically, in the present embodiment, as shown in fig. 2 and 5, the nesting portion 11 is a groove recessed in the end of the sleeve 10 and capable of accommodating a nut, and an inner wall surface of the groove has an annular abutting wall 111 adapted to the shape of the nut, for example, when the nut to be screwed is a hexagon nut, the annular abutting wall 111 has six abutting wall surfaces corresponding to six side walls of the nut; thus, when the nut is nested in the nesting portion 11, the outer wall surface of the nut contacts the annular abutting wall 111, and when the sleeve 10 rotates, the nut abuts against the annular abutting wall 111 and can rotate along with the sleeve 10.

In another embodiment of the present invention, as shown in fig. 1, fig. 2 and fig. 3, the nut screwing mechanism further includes a transmission assembly 40, the rotary driving member 20 transmits the screwing torque to the sleeve 10 through the transmission assembly 40, specifically, the transmission assembly 40 includes a driving gear 41, a driven gear 42 and a transmission shaft 43, the driving gear 41 is connected to the power output shaft 21 of the rotary driving member 20, the driven gear 42 is engaged with the driving gear 41, the transmission shaft 43 and the sleeve 10 both have a first end and a second end which are opposite to each other, the nesting portion 11 is disposed at the first end of the sleeve 10, the driven gear 42 is sleeved at the first end of the transmission shaft 43, and the second end of the sleeve 10 is connected to the second end of the transmission shaft 43. Thus, when the rotary driving member 20 is started, the power output shaft 21 of the rotary driving member 20 rotates and drives the driving gear 41 to rotate, the driving gear 41 rotates and drives the driven gear 42 to rotate, the driven gear 42 drives the transmission shaft 43 to rotate around the self axis, and the transmission shaft 43 further drives the sleeve 10 to rotate around the self axis, so as to tighten the nut. The transmission structure is simple and compact, the whole volume of the tightening mechanism is reduced, the tightening torque is transmitted through the meshing of the driving gear 41 and the driven gear 42, and nuts needing different tightening torques can be realized by replacing the driving gear 41 and the driven gear 42 with different transmission ratios, so that the use is more flexible and convenient.

In another embodiment of the present invention, as shown in fig. 2 and 3, the mounting seat 30 includes a mounting plate 31 and a mounting tube 32, the rotary driving member 20 is installed on the mounting plate 31, the driving gear 41 and the driven gear 42 are installed on the mounting plate 31 along the horizontal direction, specifically, the driving gear 41 is installed on one side portion of the mounting plate 31, the driven gear 42 is installed on the other side portion of the mounting plate 31, the driven gear 42 and the driving gear 41 are arranged in the vertical direction in a staggered manner, so that the space above the driven gear 42 is free, and no interference with other objects is caused. Connecting hole 311 has been seted up to the position department that mounting panel 31 just right driven gear 42, the installation section of thick bamboo 32 is fixed in the below of mounting panel 31, transmission shaft 43 wears to locate in the installation section of thick bamboo 32, the first end of transmission shaft 43 is worn out from connecting hole 311 and is cup jointed with driven gear 42, the first end of sleeve 10 is nested portion 11 promptly and can be followed the installation section of thick bamboo 32 and deviate from the tip of mounting panel 31 and stretch out, transmission shaft 43 can be under the exogenic action along self axis direction reciprocating motion from top to bottom in being in installation section of thick bamboo 32, thereby drive sleeve 10 reciprocating motion from top to bottom so that nested portion 11 nest.

When the nut screwing mechanism of the present embodiment is used to perform a screwing operation, the transmission shaft 43 moves downward along its axis in the mounting cylinder 32 under the action of external force, and drives the first end of the sleeve 10 to move close to the nut, so that the nested portion 11 at the first end of the sleeve 10 nests the nut, otherwise, after the screwing operation is completed, the transmission shaft 43 drives the sleeve 10 to move reversely under the action of external force, so that the nested portion 11 is separated from the nut. Driven gear 42 top does not set up other structures, driven gear 42 top is reserved has enough big space and is used for installing the external drive piece that drive transmission shaft 43 reciprocated, external drive piece's setting does not receive the influence of other structures of tightening mechanism self, make the nut screwing mechanism of this embodiment can be better use with external equipment cooperation, and, can confirm through the driven gear 42 of changing different size of a dimension and reserve the suitable installation space of size, with the driving piece of matching different size of a volume, other original structures can not be interfered in the equipment repacking.

Specifically, in the present embodiment, as shown in fig. 2 to 4, the transmission assembly 40 further includes a spline nut 45, a first bearing 46 and a second bearing 47, the first bearing 46 is embedded and fixed in the connecting through hole 311, the driven gear 42 is sleeved outside the spline nut 45, the spline nut 45 is sleeved at the first end of the transmission shaft 43, and the spline nut 45 and the transmission shaft 43 form a ball spline; the spline nut 45 penetrates through the first bearing 46 and is fixed with the inner ring of the first bearing 46, one end of the spline nut 45 extends out of the mounting plate 31 and is in key connection with the driven gear 42, such as flat key connection and the like, the second bearing 47 is embedded in the mounting cylinder 32, and the other end of the spline nut 45 extends out of the connecting through hole 311 and is fixed with the inner ring of the second bearing 47 so as to be rotatably connected with the mounting cylinder 32 through the second bearing 47.

More specifically, in the present embodiment, as shown in fig. 2 to 4, the transmission shaft 43 is a spline shaft, the outer wall surface of the first end of the transmission shaft is uniformly provided with a plurality of rail protrusions (not shown) at intervals, for example, three rail protrusions are equally spaced at 120 degrees on the outer wall surface of the transmission shaft 43, six load ball rows are formed on the outer wall surface of the transmission shaft 43, and the balls at the corresponding positions of the spline nuts are clamped between the load ball rows at the left and right sides of the corresponding rail protrusions, so that the friction between the outer wall surface of the transmission shaft 43 and the outer wall surface of the spline nuts 45 can be reduced, thereby saving the external acting force for driving the transmission shaft 43 to. More specifically, a slip-off preventing pin 431 is further vertically connected to the middle portion of the transmission shaft 43, the length of the slip-off preventing pin 431 is greater than the outer diameter of the spline nut 45, and the slip-off preventing pin 431 can be used for preventing the transmission shaft 43 from being pulled out of the mounting cylinder 32 under the action of external force.

In another embodiment of the present invention, as shown in fig. 2 to 4, the second end of the transmission shaft 43 is connected to the second end of the sleeve 10 through a transmission connector 44, the transmission connector 44 includes a first connector 441, a second connector 442 and a connecting joint 443, the first connector 441 is connected to the second end of the transmission shaft 43, the second connector 442 is connected to the second end of the sleeve 10, and the second connector 442 is rotatably connected to the first connector 441 through the connecting joint 443. Thus, the sleeve 10 can rotate relative to the transmission shaft 43, when other objects are arranged around the nut, so that the nut screwing mechanism of the embodiment is inconvenient to integrally move right above the nut, the connection angle between the sleeve 10 and the transmission shaft 43 can be changed by rotating the sleeve 10, the sleeve 10 can move right above the nut at a proper angle, so that the nut can be nested in the nested part 11, then the rotary driving piece 20 is started, the screwing torque can still be transmitted to the nested part 11 of the sleeve 10 through the transmission connecting piece 44, and the situation that the torque cannot be transmitted due to the change of the connection angle between the sleeve 10 and the transmission shaft 43 is avoided; in addition, when the sleeve 10 moves to the nesting part 111 and is sleeved with the nut, the nut and the transmission shaft 43 are not concentric, and by arranging the transmission connecting piece 44, the sleeve 10 rotates to adjust the connecting angle between the sleeve 10 and the transmission shaft 43, the nut and the transmission shaft 43 rotate coaxially, the nut rotates more smoothly, and the tightening operation is more labor-saving and reliable.

Specifically, in the present embodiment, as shown in fig. 2 to 4, a first connecting shaft 4431 and a second connecting shaft 4432 are protruded from a side wall of the connecting joint 443 and are arranged in a crisscross manner, the first connecting head 441 is rotatably connected to the connecting joint 443 via the first connecting shaft 4431, the second connecting head 442 is rotatably connected to the connecting joint 443 via the second connecting shaft 4432, and the first connecting head 441, the connecting joint 443, and the second connecting head 442 together form a universal joint structure. In this way, the connecting joint 443 is rotatably connected to the first connecting head 441 by the first connecting shaft 4431 and can rotate around the first connecting shaft 4431, and the connecting joint 443 is rotatably connected to the second connecting head 442 by the second connecting shaft 4432 and can rotate around the second connecting shaft 4432, so that the sleeve 10 can rotate around the first connecting shaft 4431 and the second connecting shaft 4432. Specifically, two first connecting lugs 4412 which are oppositely arranged are protruded from the end of the second connecting head 442 facing the first connecting head 441, two first connecting holes 4411 through which the first connecting shaft 4431 is rotatably inserted are respectively formed in the two first connecting lugs 4412, two second connecting lugs 4422 which are oppositely arranged are protruded from the end of the first connecting head 441 facing the second connecting head 442, two second connecting holes 4421 through which the second connecting shaft 4432 is rotatably inserted are respectively formed in the two second connecting lugs 4422, and the hole axes of the first connecting hole 4411 and the second connecting hole 4421 are both perpendicular to the axis of the mounting cylinder 32.

In another embodiment of the present invention, as shown in fig. 1 to 4, the nut screwing mechanism further includes a positioning assembly 50 for limiting the coaxial connection between the sleeve 10 and the transmission shaft 43, the positioning assembly 50 includes an elastic positioning member 51 coaxially disposed with the transmission shaft 43 and sleeved outside the transmission shaft 43, one end of the elastic positioning member 51 is connected to the transmission shaft 43, and the other end of the elastic positioning member 51 is connected to the sleeve 10 and elastically supports the sleeve 10, so that the axis of the sleeve 10 and the axis of the transmission shaft 43 are kept coincident. In this way, when the tightening operation is not performed, that is, the socket 10 is always kept coaxial with the transmission shaft 43 in the initial state, the position of the socket 10 can be used as a positioning reference when the nut screwing mechanism of the present embodiment is assembled with other equipment, and when the nut screwing mechanism is moved, the socket 10 can be moved to a specified position more quickly by using this as a reference. In addition, when the socket 10 is rotatably connected to the transmission shaft 43 through the transmission connector 44, the socket 10 may shake during the moving process, at this time, the elastic positioning element 51 is disposed to push the socket 10, and during the moving process, the elastic positioning element 51 elastically restrains the socket 10 so that the socket cannot shake, thereby facilitating the fast and accurate movement of the socket 10, and enabling the nesting portion 11 to fast move to a position right above the nut.

Specifically, in the embodiment, as shown in fig. 2 to 4, the elastic positioning element 51 is a spring sleeved outside the transmission shaft 43, the positioning assembly 50 further includes a first spring fixing seat 52 and a second spring fixing seat 53, the outline of which is adapted to the installation cylinder 32, the first spring fixing seat 52 is sleeved at the second end of the transmission shaft 43, the second spring fixing seat 53 is sleeved at the second end of the sleeve 10, two opposite end portions of the elastic positioning element 51 are respectively embedded in the first spring fixing seat 52 and the second spring fixing seat 53, when the transmission shaft 43 drives the first spring fixing seat 52 and the second spring fixing seat 53 to ascend to the predetermined position, the first spring fixing seat 52 and the second spring fixing seat 53 are accommodated in the installation tube 32, and outer wall surfaces of the first spring fixing seat 52 and the second spring fixing seat 53 are both in contact with an inner wall surface of the installation tube 32 and can slide along the tube wall of the installation tube 32. So, when first spring fixing seat 52 and second spring fixing seat 53 were acceptd in installation section of thick bamboo 32, the position that sleeve 10 was located is the location reference position promptly, like this, set up first spring fixing seat 52 and second spring fixing seat 53 location installation elastic positioning element 51, elastic positioning element 51's dismouting is more convenient, and, first spring fixing seat 52 and second spring fixing seat 53 can also be to elastic positioning element 51 its auxiliary stay's effect, the combined action of three makes sleeve 10 better keep under initial condition with the coaxial setting of transmission shaft 43.

More specifically, when the nut screwing operation is started, the transmission shaft 43 moves towards the nut under the action of external force, and the transmission shaft 43 moves and simultaneously extrudes the first positioning piece mounting seat 52, the second positioning piece mounting seat 53 and the elastic positioning piece 51 together to be pulled out from the mounting cylinder 32, at this time, the sleeve 10 can rotate relative to the transmission shaft 43 again.

In another embodiment of the present invention, as shown in fig. 1 and fig. 2, the rotary driving member 20 includes a driving motor 22 and a speed reducer 23, an output shaft of the driving motor 22 is connected to an input shaft of the speed reducer 23, an output shaft of the speed reducer 23 is connected to a rotating shaft of the driving gear 41, the speed reducer 23 is fixedly mounted on the mounting plate 31 through a speed reducer fixing seat 2311, and the driving gear 41 is accommodated in the speed reducer fixing seat 2311. The speed reducer 23 can reduce the rotation speed of the drive motor 22 and increase the torque, so that the drive output power of the rotary drive member 20 can be set to be better matched with the tightening torque required by the nut.

Specifically, in the present embodiment, the driving motor 22 is preferably a servo motor, and the servo motor has the characteristics of small electromechanical time constant, high linearity, and the like, and can convert the received electric signal into an accurate angular displacement or angular velocity output, and the accuracy of the angular displacement or angular velocity output can reach 0.001 mm.

Another embodiment of the present invention further provides a nut runner (not shown) including the above nut runner mechanism.

The nut screwing device of the embodiment can realize the automatic nut screwing operation by using the nut screwing mechanism, thereby effectively reducing the labor intensity of operators and improving the operation efficiency, and can also control the screwing torque applied to the nut by controlling the power output of the rotary driving piece 20, so that the situation that the nut is damaged by overlarge torque or the nut is not screwed in place by undersize torque can not occur when the nut is screwed, the nut after being screwed is not easy to loosen, and the fastening connection is more stable and reliable.

In this embodiment, the nut screwing device further includes a driving mechanism for driving the transmission shaft 43 to reciprocate up and down along its axis direction, and the driving mechanism drives the transmission shaft 43 to move up and down in the mounting cylinder 32, so as to drive the sleeve 10 to move up and down to enable the nesting part 11 to nest or separate from the nut.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A nut screwing mechanism is characterized in that: the nut screwing device comprises a mounting seat, a sleeve and a rotary driving piece, wherein the sleeve is mounted on the mounting seat and used for being matched with a nested nut, the rotary driving piece is used for driving the sleeve to rotate so as to provide screwing torque, a nested part used for being matched with and nested with the nut is arranged at one end, far away from the mounting seat, of the sleeve, and a power output shaft of the rotary driving piece is in driving connection with the sleeve and used for driving the sleeve to rotate around the axis of the sleeve, so that the nested part drives the nut to rotate and screw the nut.

2. A nut runner mechanism as defined in claim 1, further comprising: the nut screwing mechanism further comprises a transmission assembly, the transmission assembly comprises a driving gear, a driven gear and a transmission shaft, the driving gear is connected with a power output shaft of the rotary driving piece, the driven gear is connected with the driving gear in a meshed mode, the transmission shaft and the sleeve are provided with a first end and a second end which are opposite to each other, the nesting portion is arranged at the first end of the sleeve, the driven gear is connected with the first end of the transmission shaft in a sleeved mode, and the second end of the sleeve is connected with the second end of the transmission shaft.

3. A nut runner mechanism as defined in claim 2, further comprising: the mount pad includes mounting panel and installation section of thick bamboo, rotary driving spare install in on the mounting panel, the driving gear with driven gear rotate along the horizontal direction install in on the mounting panel, the mounting panel is just right driven gear's position department has seted up connect the hole, the installation section of thick bamboo is fixed in the below of mounting panel, the transmission shaft is worn to locate in the installation section of thick bamboo, the first end of transmission shaft is followed connect the hole is worn out and with driven gear cup joints, telescopic first end is followed the installation section of thick bamboo deviates from the tip of mounting panel stretches out, the transmission shaft can be in under the exogenic action in the installation section of thick bamboo along self axis direction reciprocating motion from top to bottom, thereby drive reciprocating motion is so that nested portion is nested or breaks away from the nut from about the sleeve.

4. A nut runner mechanism as defined in claim 3, further comprising: the transmission assembly further comprises a spline nut, a first bearing and a second bearing, the first bearing is fixedly embedded in the connecting through hole, the spline nut is sleeved at the first end of the transmission shaft, the spline nut and the transmission shaft form a ball spline, the spline nut penetrates through the first bearing and is fixed with an inner ring of the first bearing, one end of the spline nut extends out of the mounting plate and is in key connection with the driven gear, the second bearing is fixedly embedded in the mounting barrel, and the other end of the spline nut extends out of the connecting through hole and is fixed with an inner ring of the second bearing so as to be rotatably connected with the mounting barrel through the second bearing.

5. A nut runner mechanism as defined in claim 4, further comprising: the second end of transmission shaft with telescopic second end is connected through the transmission connecting piece, the transmission connecting piece includes first connector, second connector and link, first connector connect in the second end of transmission shaft, the second connector connect in telescopic second end, the second connector passes through the link with first connector rotates and connects, thereby makes the sleeve can be relative the transmission shaft rotates.

6. A nut runner mechanism as defined in claim 5, further comprising: protruding the stretching of the lateral wall of link has first connecting axle and the second connecting axle that is the cross and lays, first connector passes through first connecting axle with the link rotates to be connected, the second connector passes through the second connecting axle with the link rotates to be connected, first connector the link reaches the second connector forms the universal joint structure jointly.

7. A nut screwing mechanism according to any one of claims 3 to 6, wherein: the nut screwing mechanism further comprises a positioning assembly used for limiting the sleeve to be coaxially connected with the transmission shaft, the positioning assembly comprises an elastic positioning piece which is coaxially arranged with the transmission shaft and sleeved outside the transmission shaft, one end of the elastic positioning piece is connected with the transmission shaft, the other end of the elastic positioning piece is connected with the sleeve and elastically pushes against the sleeve, and therefore the axis of the sleeve and the axis of the transmission shaft are kept coincident.

8. A nut runner mechanism as defined in claim 7, further comprising: the elastic positioning piece is sleeved with a spring outside the transmission shaft, the positioning assembly further comprises an outline adaptive to the first spring fixing seat and the second spring fixing seat of the installation barrel, the first spring fixing seat is sleeved at the second end of the transmission shaft, the second spring fixing seat is sleeved at the second end of the sleeve, two ends of the spring are respectively embedded in the first spring fixing seat and the second spring fixing seat, the transmission shaft drives the first spring fixing seat and the second spring fixing seat to ascend to a preset position, and the first spring fixing seat and the second spring fixing seat are both contained in the installation barrel.

9. A nut screwing mechanism according to any one of claims 3 to 6, wherein: the rotary driving piece comprises a driving motor and a speed reducer, an output shaft of the driving motor is connected with an input shaft of the speed reducer, an output shaft of the speed reducer is connected with a rotating shaft of the driving gear, the speed reducer is installed on the installation plate through a speed reducer fixing seat, and the driving gear is contained in the speed reducer fixing seat.

10. A nut runner comprising a nut runner mechanism as claimed in any one of claims 1 to 9.