JP6245944B2 - Reaction force receiver and tightening device equipped with the same - Google Patents

Description

  The present invention relates to a reaction force receiver used for tightening and tightening fastening members such as bolts and nuts, and a tightening device equipped with the reaction force receiver.

  2. Description of the Related Art As a tightening device used for tightening and loosening fastening members such as bolts and nuts, a two-shaft tightening device having an inner shaft and an outer shaft whose drive shafts rotate in reverse directions is known (for example, a patent) Reference 1).

  A socket for mounting a fastening member is attached to the inner shaft, and a reaction force receiver is provided on the outer shaft. The reaction force receiver is applied to a protrusion such as a fastening member already tightened in the vicinity of the fastening member so as to receive the reaction force generated at the time of tightening.

JP 2007-196377 A

  The outer shaft to which the reaction force receiver is attached has a lower rotational speed than the inner shaft. For this reason, in order to increase the efficiency of the tightening work, it is desirable to set the reaction force receiver as close to the projecting object as possible in the rotational direction when the tightening member is mounted on the socket. However, a user unfamiliar with the operation of the tightening machine considers that the reaction force receiver rotates in the same direction as the socket, and sets the reaction force receiver in the opposite position to the rotation direction with respect to the protruding object. There is.

  If the reaction force receiver is set in the reverse position in this manner, the reaction force receiver must rotate approximately one turn until the arm contacts the projection during tightening, which is useless for the tightening operation. It takes time.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a reaction force receiver and a tightening device including the same that can easily determine the rotational direction during a tightening operation.

In order to solve the above problems, the reaction force receiver of the present invention is
A reaction force receiver mounted on the outer shaft of the drive shaft in which the inner shaft and the outer shaft rotate in opposite directions,
An arm extending in a direction perpendicular to the axis of the drive shaft;
The arm is provided with a display indicating a rotation direction corresponding to the tightening / loosening direction.

  The display may be at least one selected from the group consisting of a character, a symbol, a figure, a pattern, and a color indicating the rotation direction of the arm according to the tightening direction.

  A cover having a buffering action is attached to the arm, and the display is attached to the cover.

According to the reaction force receiver of the present invention, it is possible to know the rotation direction of the reaction force receiver based on the indication of the rotation direction of the arm described according to the tightening / loosening direction. Therefore, by referring to this display, the user can set the reaction force receiver at the correct position.
Thereby, generation | occurrence | production of the useless time which arises by setting a reaction force receiver in a reverse position can be suppressed.

  In addition, by making the display of the reaction force reception correspond to the display of the forward / reverse switching switch, the display of the forward / reverse switching switch is referred to, and the reaction force reception is performed according to the display of the reaction force reception so as to correspond to the display. By setting, it is possible to prevent the reaction force receiver from being set in the reverse position.

  Further, since the buffer cover is attached to the reaction force receiving arm, it is possible to prevent the projecting object from being damaged by hitting the projecting object such as a fastening member to which the arm has already been tightened.

FIG. 1 is a schematic explanatory view of a tightening device according to an embodiment of the present invention. FIG. 2 is a block diagram of a tightening device according to an embodiment of the present invention. FIG. 3 is a view of the reaction force receiver as viewed from the rear side of the tightening machine. FIG. 4 is a view of the forward / reverse switching switch as viewed from the rear side of the tightening machine.

  1 and 2, a tightening machine 20 as a main body for tightening, a control device 30 for controlling the tightening machine 20, and a torque detection for measuring torque. An embodiment applied to a numerically controlled tightening device composed of a container 50 will be described. Note that the control device 30 may be configured such that part or all of the functions thereof are built into the loosening machine 20, and configured so that a part of the functions of the control device 30 is executed by an external PC or the like. May be.

  FIG. 1 is a diagram for explaining the outline of a tightening device 10 of the present invention, and FIG. 2 is a schematic block diagram of the tightening device 10. As shown in the figure, the tightening device 10 includes a tightening device 20 and a control device 30, and the tightening device 20 includes a torque detector 50 that detects torque acting on the socket.

<Loosening machine 20>
The loosening machine 20 is a two-shaft electric wrench with an inner shaft and an outer shaft 22 as a drive shaft, but if it is a two-shaft type, an impact wrench, impact driver, vibration / hammer drill, etc. Good.

  In the two-axis type tightening / loosening machine 20, an inner shaft and an outer shaft 22 that serve as a drive shaft 21 can be rotated in reverse to each other by a motor 24 built in a housing 23. The inner shaft and the outer shaft 22 can be connected to the motor 24 by a speed reduction mechanism 28 such as a planetary gear mechanism.

  The loosening machine 20 includes a socket to which a fastening member such as a bolt or a nut can be attached at the tip of the inner shaft. Further, as shown in FIGS. 1 and 3, a reaction force receiver 25 having an arm 25 a whose tip projects in a substantially vertical direction with respect to the axis of the drive shaft 21 is attached to the tip of the outer shaft 22. ing. The socket and the reaction force receiver can be integrated with or removable from the drive shaft 21.

  As shown in FIG. 3, the reaction force receiver 25 is provided with a cover 70 having a buffering action. For example, the cover 70 can be made of a resin material. The cover 70 is formed along the shape of the arm 25a. It is desirable that the cover 70 is detachable from the arm 25a and can be replaced when the cover 70 is damaged.

  The reaction force receiver 25 rotates in the reverse direction to the fastening direction of the fastening member. Accordingly, the cover 70 has a direction opposite to the fastening direction of the fastening member (indicated by an arrow A in FIG. 3), that is, if the fastening member is a normal screw, the fastening direction of the fastening member is clockwise. Therefore, the displays 71 and 72 composed of any one or a combination of one or more of a character, a symbol, a figure, a pattern, and a color indicating the rotation direction are attached to the preceding position when the counterclockwise rotation is made in the reverse direction.

  In FIG. 3, a “squeeze” 71 character is displayed at a position preceding when the reaction force receiver 25 tightens the fastening member. In addition, when the fastening member is rotated in the loosening direction, the characters “loosen” 72 are displayed at the position where the reaction force receiver 25 precedes.

  The indications 71 and 72 need only be able to identify the rotational direction of the reaction force receiver 25. For example, when the fastening member is tightened, the preceding position is “red” and the fastening member is rotated in the loosening direction. The position where the reaction force receiver 25 precedes may be painted in “blue”.

  Since these covers 71 and 72 may be used without the cover 70 attached, they may be directly attached to the arm 25a.

  The tightening machine 20 operates the trigger switch 26 shown in FIG. 1, receives a command from the control device 30 shown in FIG. 2, drives the motor 24, and rotates the drive shaft 21. Further, as shown in FIG. 1, the tightening / loosening machine 20 is provided with a forward / reverse switching switch 27, and by operating the forward / reverse switching switch 27, the rotation of the motor 24 is reversed to be engaged. The member can be tightened and loosened. The forward / reverse switching switch 27 can mechanically switch between normal rotation and reverse rotation of the drive shaft 21 by gear switching of the speed reduction mechanism 28, clutch operation, or the like. The forward / reverse switching switch 27 may be a switch that reverses the voltage supplied to the motor 24. FIG. 4 shows an embodiment in which a dial type switch knob is adopted as the forward / reverse switching switch 27, but a slide type switch knob can also be adopted.

  As shown in FIG. 4, the forward / reverse switching switch 27 is provided with a mark 80 indicating the switching position, and the mark 80 faces the housing 23 when the forward / reverse switching switch 27 is switched. The positions are provided with displays 81 and 82 indicating their functions.

  More specifically, the housing 23 is displayed with “squeeze” 81 at a position where the mark 80 faces when the forward / reverse switching switch 27 is switched to the tightening side, and the mark 80 faces when switched to the loose side. “Loose” 82 is indicated at the position to be moved. These displays 81 and 82 correspond to, and preferably match, the displays 71 and 72 attached to the arm 25a of the reaction force receiver 25. Thus, the user only has to set the reaction force receiver 25 close to the protrusion so that the displays 71 and 72 of the reaction force receiver 25 and the displays 81 and 82 of the forward / reverse switching switch 27 coincide with each other. Can be prevented.

  If the displays 71 and 72 of the arm 25a are color-coded, the displays 81 and 82 of the forward / reverse switching switch 27 may be color-coded so as to match the color coding.

<Torque detector 50>
The tightening machine 20 is provided with a torque detector 50 that detects torque acting on the socket. The torque detector 50 transmits a signal related to torque to the control device 30. As the torque detector 50, as shown in FIG. 1, a torque sensor 51 for directly detecting the tightening torque can be used between the drive shaft 21 and the socket. The torque acting on the socket may be detected from an electric system of the loosening machine 20, for example, a change in motor current. The torque acting on the socket may be converted from the rotation angle of the drive shaft 21, the motor 24, the speed reduction mechanism 28, and the like.

  When the torque detector 50 is attached to the drive shaft 21 as shown in FIG. 1, the torque detector 50 rotates integrally with the drive shaft 21, and cannot be connected to the control device 30 by wire. Therefore, as shown in FIG. 2, a signal relating to the tightening torque measured by the torque sensor 51 is amplified by the amplifier circuit 52, A / D converted by the A / D converter circuit 53, and input to the CPU 54. It is desired to wirelessly transmit via an RF (Radio Frequency) circuit 55 and an antenna 56. The power supply to the torque detector 50 can be performed by mounting a small battery on the torque detector 50.

  As a specific embodiment, the torque sensor 51 can be exemplified by a strain gauge attached to the outer shaft 22. As for the tightening torque acting on the outer shaft 22, the resistance change of the strain gauge is output as a voltage change.

<Control device 30>
As shown in FIG. 1, the control device 30 is electrically connected to the tightening machine 20 through a connection cable 60, and can communicate with the tightening machine 20 and supply power to the tightening machine 20. . Note that the control device 30 needs to be set and adjusted according to the performance and characteristics of the loosening machine 20. Therefore, if a different loosening machine 20 is connected to the control device 30, an erroneous measurement or the like may occur. For this reason, it is desirable that the connection cable 60 is directly connected to the loosening machine 20 and the control device 30 so as not to be inserted or removed.

  Further, the control device 30 can be connected to a commercial power source through a power cable 62 having a plug 61 connected to the tip.

  As a specific embodiment, the control device 30 incorporates a control means 32 shown in FIG. 2 in a box-type casing 31 as shown in FIG. The control unit 32 includes a CPU 34, a memory 35 such as a RAM and a ROM, and a control unit 33 mainly composed of various electronic components such as a D / A converter, and is realized by various programs stored in the memory 35. can do. In FIG. 2, functional blocks relating to typical functions realized by these connections are depicted. It should be understood that these functional blocks can be realized by hardware only, software only, or a combination thereof.

  As shown in FIG. 1, on one surface of the casing 31, a set torque display unit 40 that displays a set torque desired by the user, and a measured torque display unit 41 that displays a tightening torque measured by the torque detector 50. With Further, torque setting buttons 47 and 48 for increasing / decreasing the set torque by the user and a mode changeover switch 44 for switching the tightening mode are provided. Further, the casing 31 is provided with a torque setting range display 46 indicating a settable range of the setting torque of the tightening device 10.

  The set torque display unit 40 and the measured torque display unit 41 can be digital displays that employ LEDs, for example. These or any one of the display units can also serve as an error display unit for displaying an abnormality when any abnormality occurs in the tightening device 10. In FIG. 1, reference numeral 42 denotes a set torque sub display unit that displays the set torque when the torque setting buttons 47 and 48 are operated, and is formed smaller than the set torque display unit 40.

  The torque setting buttons 47 and 48 are a minus button 47 that decreases the set torque and a plus button 48 that increases the set torque. These torque setting buttons 47 and 48 can also be used as error release buttons by operating one of them when an abnormality occurs in the tightening device 10.

  The mode switch 44 is a switch for switching between two different tightening modes, and can adopt a push button type, a dial type, a slide type, or the like. In order to make it possible to visually recognize which tightening mode the mode change switch 44 is set to, a display unit for displaying the staying tightening mode is provided in the mode change switch 44 or at an appropriate position of the casing 31. . In the illustrated embodiment, the display unit is provided with an LED 45 that lights up corresponding to any of the tightening modes. The mode changeover switch 44 shown in the figure is configured so that the built-in LED 45 is turned on when one of the tightening modes is set. For example, it is possible to display the tightening mode staying at the above-described measured torque display unit 41 and the like and to switch the display when tightening is started. In this case, check the tightening mode during the tightening operation. I can't. Further, another operation is required to confirm the tightening mode. On the other hand, in the present invention, since the mode changeover switch 44 is lit, the fastening mode during the stay can be visually confirmed, and there is an advantage that erroneous operation and the like can be prevented.

  As shown in FIG. 1, the torque setting range display unit 46 indicates the upper limit and the lower limit of the set torque of the tightening device 10. As shown in FIG. 1, the torque setting range display unit 46 can be exemplified by the setting range stamped on a plate or printed on a seal and attached to the casing 31. Moreover, it can also be set as a digital display similarly to the said setting torque display part 40 grade | etc.,.

  As shown in FIG. 2, the control unit 33 constituting the control means 32 is connected to the display units 40, 41, 42, buttons 47, 78, and the mode changeover switch 44, and is tightened via the trigger switch 26. A motor drive circuit 36 for driving the motor 24 of the machine 20, an RF circuit 37 for wirelessly communicating with the torque detector 50, and an antenna 38 are connected. For example, the output adjustment of the motor 24 by the motor drive circuit 36 can be performed by phase control or PWM control.

  The memory 35 stores all programs for controlling the loosening machine 20. For example, in the memory 35, the set torque set by the user according to each tightening mode, the tightening program and various parameters according to each tightening mode, the tightening mode during the stay, the measured torque received and the setting The control amount of the motor drive circuit 36 for adjusting the output of the motor 24 based on the torque is stored.

  In the tightening / loosening device 10 configured as described above, when the fastening member is tightened, first, the forward / reverse switching switch 27 is rotated in the direction of arrow B in FIG. Set to the display. Next, the arm 25a is aligned so that the side of the “squeeze” 71 displayed is in contact with the protrusion with the shortest rotation distance, and the fastening member is attached to the socket. In this state, the trigger 24 may be operated to start the motor 24.

  As a result, the socket rotates in the tightening direction, and the reaction force receiver 25 rotates in the direction opposite to the tightening direction so as to abut against the protruding object, and can receive the reaction force generated by tightening the socket. In the reaction force receiver 25, the arm 25a abuts against the projecting object at the shortest rotation distance, so that unnecessary rotation of the reaction force receiver 25 can be suppressed, and the tightening operation can be shortened.

  When performing the loosening operation of the fastening member, first, the mark 80 of the forward / reverse switching switch 27 is set to the display of “loose” 82. Next, the arm 25a is positioned so that the side of the "relaxation" 72 of the arm 25a is in contact with the protrusion with the shortest rotation distance, and the fastening member is attached to the socket. In this state, the trigger 24 may be operated to start the motor 24.

  As a result, the socket rotates in the loosening direction, and the reaction force receiver 25 rotates in the direction opposite to the loosening direction and comes into contact with the protrusion, so that the reaction force generated by the loosening of the socket can be received. In the reaction force receiver 25, since the arm 25a abuts against the protrusion with the shortest rotation distance, unnecessary rotation of the reaction force receiver 25 can be suppressed as described above, and the tightening operation can be shortened. it can.

  In addition, since the arm 25a is provided with the cover 70 having a buffering action, it is possible to prevent the projecting object from being damaged or the arm 25a itself from being damaged.

  The above description is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

DESCRIPTION OF SYMBOLS 10 Loosening device 20 Loosening machine 25 Reaction force receiver 25a Arm 27 Forward / reverse switch 70 Cover 71, 72
81,82 display (forward / reverse switch)

Claims (4)

A reaction force receiver mounted on the outer shaft of the drive shaft in which the inner shaft and the outer shaft rotate in opposite directions,
An arm extending in a direction perpendicular to the axis of the drive shaft;
The arm is provided with a display indicating a rotation direction according to the tightening / loosening direction,
A reaction force receiver characterized by that. The display is at least one selected from the group consisting of a character, a symbol, a figure, a pattern, and a color indicating the rotation direction of the arm according to the tightening direction.
The reaction force receiver according to claim 1. A cover having a buffering action is attached to the arm, and the display is attached to the cover.
The reaction force receiver according to claim 1 or claim 2. A tightening device having a drive shaft in which an inner shaft and an outer shaft rotate in opposite directions,
The reaction force receiver according to any one of claims 1 to 3 is mounted on an outer shaft of the drive shaft,
It has a forward / reverse switching switch for switching the rotation of the drive shaft between the tightening direction and the loosening direction,
The forward / reverse switching switch has a display corresponding to the display indicating the rotation direction of the arm.
A tightening device characterized by that.

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