CN111307428B

CN111307428B - Auxiliary tool for detecting trailer hook

Info

Publication number: CN111307428B
Application number: CN201911287889.5A
Authority: CN
Inventors: 储著成; 刘光宇
Original assignee: ANHUI QINGSONG TOOLS CO LTD
Current assignee: ANHUI QINGSONG TOOLS CO LTD
Priority date: 2019-12-15
Filing date: 2019-12-15
Publication date: 2021-09-03
Anticipated expiration: 2039-12-15
Also published as: CN111307428A

Abstract

The invention belongs to the technical field of automobile part detection, and particularly relates to a trailer hook detection auxiliary tool which comprises a test fixture and a loading unit, wherein the test fixture is used for fixing a thread end of a trailer hook, the loading unit is used for connecting a pull ring of the trailer hook, the test fixture is arranged on a workbench, the loading unit is arranged on a cross beam which reciprocates along the vertical direction, driving units used for driving the cross beam to move up and down are arranged at two ends of the cross beam, and the test fixture is assembled to enable an included angle between the trailer hook and the vertical direction to be adjusted at least between three angles of 0 degree, 5 degrees and 25 degrees. The trailer hook can be positioned at three stations of 0 degree, 5 degrees and 25 degrees, and the test detection requirements are met; the thread sleeve is matched with the tow hooks with different specifications, and then the thread sleeve is connected with the clamp body, so that the clamp body can fix the tow hooks with different specifications.

Description

Auxiliary tool for detecting trailer hook

Technical Field

The invention belongs to the technical field of automobile part detection, and particularly relates to a trailer hook detection auxiliary tool.

Background

According to the standard requirements of a light automobile traction device GB32087-215, tensile and compression tests of the light automobile traction device (trailer hook) at vertical, 5 degrees, 25 degrees and 30 degrees and non-national standard requirements of less than or equal to 40 degrees are required to be carried out, and whether the thread of the traction device, a pull rod and a pull ring are deformed or failed and deformation detection of an applied load point are judged. The test equipment in the prior art has a complex structure and is complex to operate, and a simple, efficient and reliable detection means is lacked.

Disclosure of Invention

The invention aims to provide a trailer hook detection auxiliary tool capable of realizing angle adjustment of a workpiece to be detected.

The technical scheme adopted by the invention is as follows:

the utility model provides a trailer hook detects assists utensil, is including the test fixture who is used for fixed trailer hook screw thread end to and be used for connecting the loading unit of trailer hook pull ring, test fixture installs on the workstation, loading unit installs on a crossbeam along vertical direction reciprocating motion, and the crossbeam both ends are equipped with the drive unit who is used for driving the crossbeam up-and-down motion, test fixture is assembled for making the contained angle that drags the hook and vertical direction adjust at least between 0 °, 5 °, 25 three angles.

The test fixture comprises a fixture body, wherein three threaded connecting parts are arranged on the fixture body, and the included angles between the axes of the three threaded connecting parts and the vertical direction are respectively 0 degree, 5 degree and 25 degree.

The test fixture further comprises a threaded sleeve, an internal thread matched with the thread of the trailer hook is arranged in a center hole of the threaded sleeve, and an external thread matched with the threaded connecting part is arranged on the outer annular surface of the threaded sleeve.

The bottom of the clamp body is provided with a sliding block, the sliding block and a sliding rail horizontally arranged on the workbench form sliding fit, a lead screw parallel to the sliding rail is rotatably arranged on the workbench, the lead screw and a nut block arranged on the clamp body form threaded fit, and one end of the lead screw is provided with a hand wheel.

The loading unit comprises a connecting seat, the connecting seat is detachably connected with the cross beam, a U-shaped connecting plate is arranged at the lower end of the connecting seat, pin holes are formed in two side walls of the U-shaped connecting plate, and pin shafts which are detachably arranged are arranged in the pin holes.

The test fixture comprises a fixed part, a sliding part and a telescopic part, wherein the sliding part is in sliding fit with the fixed part along an arc-shaped path, and the telescopic part is in sliding fit with the sliding part along the radial direction of the sliding path of the sliding part; and the telescopic part is provided with a connecting part for connecting the thread end of the trailer hook.

The fixed part comprises two vertical walls which are arranged in parallel at intervals, arc-shaped grooves are formed in the opposite side surfaces of the two vertical walls, the sliding part is positioned between the two vertical walls, and arc-shaped sliding blocks which are in sliding fit with the arc-shaped grooves are arranged on the two sides of the sliding part; the sliding part is connected with a driving block, an arc tooth surface is arranged on the driving block, and the arc center of the arc tooth surface is superposed with the arc center of the arc groove; and a first worm is further arranged between the two vertical walls, the first worm is in running fit with a support arranged between the two vertical walls, the first worm is meshed with the arc-shaped tooth surface, and a hand wheel is arranged at the end part of the worm.

Still be equipped with the second worm on the sliding part, the second worm rotates and sets up in the pars contractilis side, and the axis of second worm is parallel with the flexible route of pars contractilis, the pars contractilis is close to and is equipped with the straight tooth face with second worm meshing on a lateral wall of second worm, the one end protrusion of second worm sets up in the sliding part top surface, and is equipped with the flat axial region portion that is used for connecting the spanner on this bulge.

A fan-shaped scale plate is arranged on one vertical wall of the fixed part, the fan center of the fan-shaped scale plate is overlapped with the arc center of the arc-shaped groove, the fan center of the fan-shaped scale plate is provided with a centering mark, the arc edge of the fan-shaped scale plate is provided with an angle scale mark, and the sliding part is provided with a pointer arranged along the radial direction of the sliding path of the sliding part; the connecting portion is a threaded hole formed in the sliding portion, a threaded sleeve is arranged in the threaded hole, and an inner thread used for connecting a thread end of the trailer hook is arranged in a center hole of the threaded sleeve.

An automatic locking mechanism is arranged between the pin shaft and the U-shaped connecting plate and comprises a mounting seat, a trigger rod and a clamping plate, the mounting seat is fixedly connected with the outer side wall of the U-shaped connecting plate, the pin shaft is in sliding connection with the mounting seat, an annular clamping groove is formed in the pin shaft, the clamping plate is in sliding connection with the mounting seat along the direction perpendicular to the pin shaft, a semicircular clamping groove is formed in one end, close to the pin shaft, of the clamping plate, the diameter of the semicircular clamping groove is smaller than the diameter of the pin shaft and larger than the diameter of the groove bottom of the annular clamping groove, and when the pin shaft shrinks to the outer side of the U-shaped connecting plate, the semicircular clamping groove is opposite to the annular clamping groove; the trigger rod is connected with the mounting seat in a sliding mode along the direction parallel to the pin shaft, the trigger rod penetrates through the side wall of the U-shaped connecting plate, an inclined wedge block protruding between the two side walls of the U-shaped connecting plate is arranged at the end portion of the trigger rod, and when the towing hook pulling ring enters the space between the two side walls of the U-shaped connecting plate, the inclined wedge block can slide in the direction far away from the U-shaped connecting plate under the extrusion of the top end of the pulling ring; the extension plate is arranged on the clamping plate, the plate surface of the extension plate is parallel to the sliding direction of the clamping plate and is parallel to the sliding direction of the trigger rod, the extension plate is provided with a strip-shaped hole which is obliquely arranged, the trigger rod is provided with a guide pin which is fixedly connected with the trigger rod in a vertical mode, the guide pin and the strip-shaped hole form sliding fit, the clamping plate can be driven to slide towards the direction far away from the pin shaft when the trigger rod slides towards the direction far away from the U-shaped connecting plate, and the clamping plate can be driven to slide towards the direction close to the pin shaft when the trigger rod slides towards the direction close to the U-shaped connecting plate; a first pressure spring is arranged between the pin shaft and the mounting seat, and the first pressure spring is assembled to enable the elastic force of the first pressure spring to drive the pin shaft to slide in the direction close to the U-shaped connecting plate; and a second pressure spring is arranged between the trigger rod and the mounting seat, and the second pressure spring is assembled to enable the trigger rod to slide towards the direction close to the U-shaped connecting plate under the driving of the elasticity of the second pressure spring.

The invention has the technical effects that: the trailer hook can be positioned at three stations of 0 degree, 5 degrees and 25 degrees, and the test detection requirements are met; the thread sleeve is matched with the tow hooks with different specifications, and then the thread sleeve is connected with the clamp body, so that the clamp body can fix the tow hooks with different specifications.

Drawings

FIG. 1 is a schematic diagram of a test detection system for a pickup truck towing installation provided in accordance with an embodiment of the present invention;

fig. 2 is a schematic diagram of a workpiece positioning apparatus provided in embodiment 1 of the present invention;

fig. 3 is a perspective view of a workpiece positioning apparatus provided in embodiment 2 of the present invention;

fig. 4 is a perspective view of a workpiece positioning apparatus provided in embodiment 2 of the present invention, one of which is vertically hidden;

fig. 5 is a sectional view of a workpiece positioning apparatus provided in embodiment 2 of the present invention;

FIG. 6 is a cross-sectional view of a loading unit provided by an embodiment of the present invention;

FIG. 7 is a perspective view of a loading unit in one state provided by an embodiment of the present invention, with the mounting seat being symmetrically cut away;

FIG. 8 is a perspective view of another state of the loading unit provided by the embodiment of the present invention, in which the mounting seat is cut symmetrically;

fig. 9 is a perspective view of a loading host provided in embodiment 3 of the present invention;

FIG. 10 is a front view of a loading host provided in embodiment 3 of the present invention;

fig. 11 is a perspective view of an angle adjustment mechanism provided in embodiment 3 of the present invention.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.

As shown in fig. 1, a test detection system of a light vehicle traction device includes a loading host 10, a computer 20 and a data printer 30, where the loading host 10 includes a workbench 11, two vertical columns 12 located at two sides of the workbench 11, a top beam 13 arranged at top ends of the two vertical columns 12, and a cross beam 14 arranged between the two vertical columns 12 and reciprocating in a vertical direction, the workbench 11 is provided with a workpiece positioning device 40, a deformation detection unit 50 and a driving unit, the cross beam 14 is provided with a loading unit 60 and a load detection unit 70, the workpiece positioning device 40 is used to fix a workpiece to be detected, the loading unit 60 is used to apply a load to the workpiece, the driving unit is used to drive the loading unit 60 to reciprocate up and down, the load detection unit 70 is used to detect a load borne by the workpiece, the deformation detection unit 50 is used to detect a deformation of the workpiece, the driving unit is connected with a control signal output end of the computer 20, the load detection unit 70 and the deformation detection unit 50 are connected with a detection signal input end of the computer 20, and the data printer 30 is connected with a detection data output end of the computer 20. The invention utilizes the workpiece positioning device 40 to fix the workpiece to be tested, utilizes the loading device to simulate the real tension and compression working conditions of the workpiece, adopts the deformation detection unit 50 to detect the deformation of the workpiece under different stress states, and utilizes the computer 20 to establish the change relation between the load and the deformation, thereby realizing the automatic detection of the light automobile traction device and providing a reference basis for the design and the production of the light automobile traction device.

Example 1

As shown in fig. 2, this embodiment provides a specific implementation manner of a workpiece positioning device 40, where the workpiece positioning device 40 includes a test fixture for fixing a threaded end of a trailer hook, the test fixture includes a fixture body 41, three threaded connection portions are provided on the fixture body 41, and included angles between axes of the three threaded connection portions and a vertical direction are 0 °, 5 °, and 25 ° respectively; the test fixture further comprises a threaded sleeve 42, an internal thread matched with the thread of the trailer hook is arranged in a center hole of the threaded sleeve 42, and an external thread matched with the threaded connecting part is arranged on the outer ring surface of the threaded sleeve 42; the bottom of the clamp body 41 is provided with a sliding block, the sliding block and a sliding rail horizontally arranged on the workbench 11 form sliding fit, a lead screw parallel to the sliding rail is rotatably arranged on the workbench 11, the lead screw and a nut block arranged on the clamp body 41 form threaded fit, and one end of the lead screw is provided with a hand wheel. The trailer hook can be positioned at three stations of 0 degree, 5 degrees and 25 degrees, and the test detection requirements are met; in the embodiment, the thread bush 42 is used for matching the tow hooks with different specifications, and then the thread bush 42 is connected with the clamp body 41, so that the clamp body 41 can fix the tow hooks with different specifications, and the central hole of the thread bush 42 can be processed into various specifications according to the diameter of the thread end of the tow hook.

As shown in fig. 6, 7 and 8, this embodiment further provides a specific implementation manner of the loading unit 60, where the loading unit 60 includes a connection seat 61, the connection seat 61 is detachably connected to the cross beam 14, a U-shaped connection plate 62 is disposed at a lower end of the connection seat 61, pin holes 621 are disposed on two side walls of the U-shaped connection plate 62, and pin shafts 63 detachably disposed are disposed in the pin holes 621; the load detection unit 70 includes a load sensor 71 provided between the link base 61 and the cross member 14.

Specifically, an automatic locking mechanism is arranged between the pin shaft 63 and the U-shaped connecting plate 62, the automatic locking mechanism includes a mounting seat 63, a trigger rod 65 and a clamping plate 64, the mounting seat 63 is fixedly connected with the outer side wall of the U-shaped connecting plate 62, the pin shaft 63 is slidably connected with the mounting seat 63, an annular clamping groove 631 is arranged on the pin shaft 63, the clamping plate 64 is slidably connected with the mounting seat 63 along the direction perpendicular to the pin shaft 63, a semicircular clamping groove 641 is arranged at one end of the clamping plate 64 close to the pin shaft 63, the diameter of the semicircular clamping groove 641 is smaller than that of the pin shaft 63 and larger than the diameter of the groove bottom of the annular clamping groove 631, and when the pin shaft 63 is contracted outside the U-shaped connecting plate 62, the semicircular clamping groove 641 is opposite to the annular clamping groove 631; the trigger rod 65 is connected with the mounting base 63 in a sliding mode along the direction parallel to the pin shaft 63, the trigger rod 65 penetrates through the side wall of the U-shaped connecting plate 62, a wedge 651 convexly extending between the two side walls of the U-shaped connecting plate 62 is arranged at the end portion of the trigger rod 65, and when the pull ring of the towing hook 1 enters the space between the two side walls of the U-shaped connecting plate 62, the wedge 651 can slide in the direction away from the U-shaped connecting plate 62 under the extrusion of the top end of the pull ring; the clamping plate 64 is provided with an extension plate 66, the plate surface of the extension plate 66 is parallel to the sliding direction of the clamping plate 64 and parallel to the sliding direction of the trigger rod 65, the extension plate 66 is provided with a strip-shaped hole 661 which is obliquely arranged, the trigger rod 65 is provided with a guide pin 67 which is fixedly connected with the trigger rod 65 in a perpendicular mode, the guide pin 67 and the strip-shaped hole 661 form sliding fit, when the trigger rod 65 slides in a direction far away from the U-shaped connecting plate 62, the clamping plate 64 can be driven to slide in a direction far away from the pin 63, and when the trigger rod 65 slides in a direction near the U-shaped connecting plate 62, the clamping plate 64 can be driven to slide in a direction near the pin 63; a first pressure spring 68 is arranged between the pin 63 and the mounting seat 63, and the first pressure spring 68 is assembled so that the elasticity of the first pressure spring can drive the pin 63 to slide towards the direction close to the U-shaped connecting plate 62; a second compression spring 69 is arranged between the trigger rod 65 and the mounting seat 63, and the second compression spring 69 is assembled so that the elastic force thereof can drive the trigger rod 65 to slide towards the direction close to the U-shaped connecting plate 62. After tow the hook 1 and the installation of anchor clamps body 41 target in place, only need control loading unit 60 to descend and just can make loading unit 60 and the automatic block of pull ring of tow the hook 1, detect the back that finishes, only need operating personnel to pull out round pin axle 63 from pinhole 621, round pin axle 63 just can be locked automatically and detect next in order to wait in pinhole 621 outside, its theory of realization is: the initial station of the pin 63 is as shown in fig. 6 and 7, at this time, the pin 63 is located outside the groove body of the U-shaped connecting plate 62, the snap-gauge 64 is clamped in the annular snap-gauge 631 of the pin 63, and the inclined wedge 651 protrudes into the groove body of the U-shaped connecting plate 62; when the loading unit 60 moves downwards, a pull ring at the upper end of the trailer hook 1 extrudes a wedge 651, the wedge 651 pushes a clamping plate 64 to move upwards through a trigger rod 65 to unlock a pin 63, the pin 63 is bounced into a groove of the U-shaped connecting plate 62 under the action of a first pressure spring 68 and penetrates through the pull ring of the trailer hook 1, and the loading unit 60 is connected with the pull ring of the trailer hook 1; in the test process, the clamping plate 64 is propped by the pin shaft 63 and cannot move downwards, so that the trigger rod 65 cannot rebound to the groove body of the U-shaped connecting plate 62, and the influence of the inclined wedge 651 on the pull ring stress condition of the trailer hook 1 can be avoided; after the test is finished, the pin shaft 63 is pulled out by an operator, the loading unit 60 is separated from the trailer hook 1, the clamping plate 64 is bounced into the annular clamping groove 631 of the pin shaft 63, and meanwhile, the trigger rod 65 rebounds towards the U-shaped connecting plate 62, so that the whole device returns to the initial station.

In this embodiment, two ends of the cross beam 14 respectively form a thread fit with the screws arranged in the two vertical columns 12, and the driving unit includes a driving motor arranged below the workbench 11 and used for driving the screws in the vertical columns 12 to rotate. The deformation detection unit 50 is a dial indicator 51, the dial indicator 51 is installed on a universal bracket 52, and a base of the universal bracket 52 is fixedly connected with the workbench 11.

Example 2

As shown in fig. 3, 4 and 5, the present embodiment is different from embodiment 1 only in the implementation manner of the workpiece positioning device 40, specifically: the workpiece positioning device 40 comprises a test fixture for fixing the threaded end of the trailer hook 1; the test fixture comprises a fixed part 43, a sliding part 44 and a telescopic part 45, wherein the sliding part 44 is in sliding fit with the fixed part 43 along an arc-shaped path, and the telescopic part 45 is in sliding fit with the sliding part 44 along the radial direction of the sliding path of the sliding part 44; and a connecting part for connecting the thread end of the trailer hook 1 is arranged on the telescopic part 45.

The fixing part 43 comprises two vertical walls 431 which are arranged in parallel at intervals, arc-shaped grooves 432 are formed in the opposite side surfaces of the two vertical walls 431, the sliding part 44 is positioned between the two vertical walls 431, and arc-shaped sliding blocks 442 which are in sliding fit with the arc-shaped grooves 432 are arranged on the two sides of the sliding part 44; the sliding part 44 is connected with a driving block 441, the driving block 441 is provided with an arc tooth surface, and the arc center of the arc tooth surface is superposed with the arc center of the arc groove 432; a first worm 433 is further arranged between the two vertical walls 431, the first worm 433 is in running fit with a support arranged between the two vertical walls 431, the first worm 433 is meshed with the arc-shaped tooth surface, and a hand wheel is arranged at the end part of the first worm 433; the sliding portion 44 is further provided with a second worm 443, the second worm 443 is rotatably arranged beside the telescopic portion 45, an axis of the second worm 443 is parallel to a telescopic path of the telescopic portion 45, a side wall of the telescopic portion 45 close to the second worm 443 is provided with a straight tooth surface meshed with the second worm 443, one end of the second worm 443 protrudes out of a top surface of the sliding portion 44, the protruding portion is provided with a flat shaft portion for connecting a wrench, the arc tooth surface and the straight tooth surface mean that an overall extending path of the tooth surface is arc-shaped and straight, and is not limited to tooth shapes, and both the tooth shapes are groove-shaped helical teeth which are similar to the tooth shape of the worm and can be matched with the worm; a fan-shaped scale plate is arranged on one vertical wall 431 of the fixing part 43, the fan center of the fan-shaped scale plate is overlapped with the arc center of the arc-shaped groove 432, the fan center of the fan-shaped scale plate is provided with a centering mark, the arc edge of the fan-shaped scale plate is provided with an angle scale mark, and the sliding part 44 is provided with a pointer arranged along the radial direction of the sliding path of the sliding part 44; the connecting portion is a threaded hole formed in the sliding portion 44, a threaded sleeve 42 is arranged in the threaded hole, and an internal thread used for connecting a threaded end of the trailer hook 1 is arranged in a center hole of the threaded sleeve 42. In this embodiment, the tow hook 1 can be positioned at any angle within a certain range, and the tow hook 1 can realize detection of different angles only by once clamping, and the specific operation method is as follows: firstly, the trailer hook 1 is installed on the expansion part 45 by using the threaded sleeve 42, and then the second worm 443 is rotated to enable the pull ring of the trailer hook 1 to be opposite to the alignment mark of the fan-shaped scale plate, so that the pull ring of the trailer hook 1 is always in the same position when the angle of the trailer hook 1 is adjusted, the pull ring does not need to be disconnected with the loading unit 60, and the operation flow is simplified; after the telescopic portion 45 is adjusted, the inclination angle of the sliding portion 44 is adjusted through the first worm 433, the trailer hook 1 reaches a preset angle, then a test can be started, the worm mechanism has a self-locking function, the sliding block does not need to be locked generally, and if the sliding block is prone to shifting due to problems such as assembly accuracy in the test process, the sliding block can be locked through a locking mechanism.

Example 3

As shown in fig. 9, 10 and 11, the present embodiment is different from embodiment 1 only in the implementation manner of the loading unit 60 and the workpiece positioning device 40, specifically: the workpiece positioning device 40 comprises a fixed seat 46, wherein a fixed hole for fixing the threaded end of the trailer hook 1 is formed in the fixed seat 46, the axis of the fixed hole is vertically arranged, internal threads are formed in the inner wall of the fixed hole, a threaded sleeve 42 is arranged in the fixed hole, the outer annular surface of the threaded sleeve 42 is in threaded connection with the fixed hole, and the inner annular surface of the fixed sleeve is provided with internal threads for connecting the threaded end of the trailer hook 1; the loading host 10 further comprises a traction rope 80 and an angle adjusting mechanism 90, an intermediate cross beam 15 fixedly connected with the vertical upright post 12 is further arranged between the cross beam 14 and the workbench 11, the angle adjusting mechanism 90 is installed on the intermediate cross beam 15, one end of the traction rope 80 is connected with the loading unit 60, the other end of the traction rope passes through the angle adjusting mechanism 90 and is connected with an upper end pull ring of the trailer hook 1 on the fixed seat 46, the angle adjusting mechanism 90 comprises a wire inlet end and a wire outlet end, the traction rope 80 penetrates through from the wire outlet end, the wire inlet end is arranged right opposite to the loading unit 60 in the vertical direction, and the wire outlet end is movably arranged along the horizontal direction. The present embodiment enables the workpiece to maintain a fixed posture, and the detection of the workpiece under different stress states is realized by adjusting the loading angle of the loading unit 60, thereby simplifying the structure of the workpiece positioning device 40. And the operation is more flexible, but the embodiment can only be used for detecting the tensile strength of the workpiece.

Specifically, the angle adjusting mechanism 90 includes a fixed pulley 91, a first movable pulley 92 and a second movable pulley 93, the fixed pulley 91 is rotatably disposed on the middle cross beam 15, the first movable pulley 92 and the second movable pulley 93 are rotatably disposed on a sliding support 96, and the sliding support 96 is slidably connected with the middle cross beam 15 along the horizontal direction; the fixed pulley 91 is positioned at a wire inlet end, the second movable pulley 93 is positioned at a wire outlet end, and the traction rope 80 is sequentially wound around the fixed pulley 91, the first fixed pulley 91 and the second movable pulley 93; the first movable pulleys 92 and the second movable pulleys 93 are arranged on two sides below the fixed pulley 91 in a staggered mode, and the traction rope 80 between the fixed pulley 91 and the first movable pulley 92 and the traction rope 80 between the first movable pulley 92 and the second movable pulley 93 are horizontally arranged; a load sensor 71 is arranged on the traction rope 80 between the outgoing line end and the trailer hook 1; a swing rod 94 is pivoted on a rotating shaft of the second fixed pulley 91, a guide wheel 95 is rotatably arranged on the swing rod 94, the diameter of the guide wheel 95 is consistent with that of the second movable pulley 93, a pointer is arranged on the swing rod 94, the length direction of the pointer is collinear with the axis connecting line of the second movable pulley 93 and the guide wheel 95, a fan-shaped scale plate is arranged on the sliding support 96, the fan center of the fan-shaped scale plate is overlapped with the axis of the second movable pulley 93, and an angle scale mark is arranged at the arc top edge of the fan-shaped scale plate; the bottom of the sliding bracket 96 is provided with a sliding block which is in sliding fit with a horizontal sliding rail arranged on the middle cross beam 15; a screw rod parallel to the sliding direction of the sliding support 96 is rotatably arranged on the middle cross beam 15, the screw rod and a nut block arranged on the sliding support 96 form threaded fit, and a hand wheel is arranged at the end part of the screw rod; and a hook is arranged at one end of the hauling cable 80, which is used for connecting with a pull ring of the towing hook 1. The operator can adjust the traction angle of the traction rope 80 precisely by adjusting the horizontal position of the sliding support 96 and observing the reading of the sector scale plate.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.

Claims

1. The utility model provides a trailer hook detects assists utensil which characterized in that: the test fixture is arranged on a workbench, the loading unit is arranged on a cross beam which reciprocates along the vertical direction, driving units for driving the cross beam to move up and down are arranged at two ends of the cross beam, and the test fixture is assembled to enable the included angle between the trailer hook and the vertical direction to be adjusted at least between three angles of 0 degree, 5 degrees and 25 degrees; the test fixture comprises a fixed part, a sliding part and a telescopic part, wherein the sliding part is in sliding fit with the fixed part along an arc-shaped path, and the telescopic part is in sliding fit with the sliding part along the radial direction of the sliding path of the sliding part; the telescopic part is provided with a connecting part for connecting the thread end of the trailer hook; the fixed part comprises two vertical walls which are arranged in parallel at intervals, arc-shaped grooves are formed in the opposite side surfaces of the two vertical walls, the sliding part is positioned between the two vertical walls, and arc-shaped sliding blocks which are in sliding fit with the arc-shaped grooves are arranged on the two sides of the sliding part; the sliding part is connected with a driving block, an arc tooth surface is arranged on the driving block, and the arc center of the arc tooth surface is superposed with the arc center of the arc groove; and a first worm is further arranged between the two vertical walls, the first worm is in running fit with a support arranged between the two vertical walls, the first worm is meshed with the arc-shaped tooth surface, and a hand wheel is arranged at the end part of the worm.

2. The tow hook detection aid of claim 1, wherein: the loading unit comprises a connecting seat, the connecting seat is detachably connected with the cross beam, a U-shaped connecting plate is arranged at the lower end of the connecting seat, pin holes are formed in two side walls of the U-shaped connecting plate, and pin shafts which are detachably arranged are arranged in the pin holes.

3. The tow hook detection aid of claim 1, wherein: still be equipped with the second worm on the sliding part, the second worm rotates and sets up in the pars contractilis side, and the axis of second worm is parallel with the flexible route of pars contractilis, the pars contractilis is close to and is equipped with the straight tooth face with second worm meshing on a lateral wall of second worm, the one end protrusion of second worm sets up in the sliding part top surface, and is equipped with the flat axial region portion that is used for connecting the spanner on this bulge.

4. The tow hook detection aid of claim 1, wherein: a fan-shaped scale plate is arranged on one vertical wall of the fixed part, the fan center of the fan-shaped scale plate is overlapped with the arc center of the arc-shaped groove, the fan center of the fan-shaped scale plate is provided with a centering mark, the arc edge of the fan-shaped scale plate is provided with an angle scale mark, and the sliding part is provided with a pointer arranged along the radial direction of the sliding path of the sliding part; the connecting portion is a threaded hole formed in the sliding portion, a threaded sleeve is arranged in the threaded hole, and an inner thread used for connecting a thread end of the trailer hook is arranged in a center hole of the threaded sleeve.

5. The tow hook detection aid of claim 2, wherein: an automatic locking mechanism is arranged between the pin shaft and the U-shaped connecting plate and comprises a mounting seat, a trigger rod and a clamping plate, the mounting seat is fixedly connected with the outer side wall of the U-shaped connecting plate, the pin shaft is in sliding connection with the mounting seat, an annular clamping groove is formed in the pin shaft, the clamping plate is in sliding connection with the mounting seat along the direction perpendicular to the pin shaft, a semicircular clamping groove is formed in one end, close to the pin shaft, of the clamping plate, the diameter of the semicircular clamping groove is smaller than the diameter of the pin shaft and larger than the diameter of the groove bottom of the annular clamping groove, and when the pin shaft shrinks to the outer side of the U-shaped connecting plate, the semicircular clamping groove is opposite to the annular clamping groove; the trigger rod is connected with the mounting seat in a sliding mode along the direction parallel to the pin shaft, the trigger rod penetrates through the side wall of the U-shaped connecting plate, an inclined wedge block protruding between the two side walls of the U-shaped connecting plate is arranged at the end portion of the trigger rod, and when the towing hook pulling ring enters the space between the two side walls of the U-shaped connecting plate, the inclined wedge block can slide in the direction far away from the U-shaped connecting plate under the extrusion of the top end of the pulling ring; the extension plate is arranged on the clamping plate, the plate surface of the extension plate is parallel to the sliding direction of the clamping plate and is parallel to the sliding direction of the trigger rod, the extension plate is provided with a strip-shaped hole which is obliquely arranged, the trigger rod is provided with a guide pin which is fixedly connected with the trigger rod in a vertical mode, the guide pin and the strip-shaped hole form sliding fit, the clamping plate can be driven to slide towards the direction far away from the pin shaft when the trigger rod slides towards the direction far away from the U-shaped connecting plate, and the clamping plate can be driven to slide towards the direction close to the pin shaft when the trigger rod slides towards the direction close to the U-shaped connecting plate; a first pressure spring is arranged between the pin shaft and the mounting seat, and the first pressure spring is assembled to enable the elastic force of the first pressure spring to drive the pin shaft to slide in the direction close to the U-shaped connecting plate; and a second pressure spring is arranged between the trigger rod and the mounting seat, and the second pressure spring is assembled to enable the trigger rod to slide towards the direction close to the U-shaped connecting plate under the driving of the elasticity of the second pressure spring.