CN216846200U - Utensil is examined to shift fork of shifting for car - Google Patents

Abstract

The utility model discloses an utensil is examined to shift fork of car, which comprises a base, the base up end is provided with centre gripping subassembly and flexible distraction subassembly, the centre gripping subassembly includes hold-down mechanism and two support pieces of relative setting, support piece's upper end is provided with the bayonet socket, the bayonet socket of seting up on two support pieces flushes mutually, hold-down mechanism is provided with the hold-down piece, flexible distraction subassembly includes mount table and wedge-shaped flexible ejecting piece, the vertical activity of flexible ejecting piece sets up on the mount table, the mount table still is provided with the slider of lateral sliding, the slider cooperatees with flexible ejecting piece, be provided with the briquetting that is used for compressing tightly the fork foot of shift fork on the slider, the lower extreme of flexible ejecting piece is provided with the driving piece that drives its vertical removal; can carry out the fixed clamp to the shift fork axle sleeve that shifts through the centre gripping subassembly that sets up on the base and press from both sides tightly, simultaneously through the setting that compresses tightly piece and flexible subassembly that struts, can avoid examining the utensil and compress tightly the crush injury that causes to shift fork rigid.

Description

Utensil is examined to shift fork of shifting for car

Technical Field

The utility model relates to an utensil field is examined to the shift fork of shifting, concretely relates to utensil is examined to shift fork of shifting for car.

Background

Automobiles are widely used as important vehicles nowadays, and with the development of technologies, users have increasingly strict requirements on vehicle performance, especially on the handling performance of automobiles. The control of the automobile is mainly realized through the matching of the gearbox and the gear shifter, namely, the gear shifting of a speed changing phase is realized through the shifting of the gear shifter, so that the speed is switched by utilizing a differential ratio. The shifting fork of the automobile gear shifter is an important part of the associated speed reducer, and the speed reducer is controlled by shifting the shifting fork, so that the performance of the shifting fork is one of important influencing factors influencing the control performance of the automobile.

The shifting fork needs a plurality of steps and procedures in the processing, so that processing errors are easy to occur in a plurality of processing steps, and especially, the processing precision of the shifting fork can be influenced by the conditions of vibration, blockage and the like of equipment. Therefore, a series of detections are needed to be carried out on the shifting fork after the processing is finished, so that the qualification rate and the service life of the shifting fork are guaranteed. The detection function of the existing shifting fork detection tool is single, and the detection precision is low. Especially, the gear shifting fork is easy to be damaged in the process of clamping the gear shifting fork.

Based on above-mentioned reason, this application has provided a simple structure and can effectively reduce the car of work piece damage and examine utensil with shift fork of shifting.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the automobile gear shifting fork detection tool is simple in structure, convenient to use and capable of effectively reducing damage in the detection process.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve: a shifting fork checking fixture for an automobile comprises a base, wherein a clamping assembly and a flexible spreading assembly are arranged on the upper end surface of the base, the clamping assembly comprises a pressing mechanism and two supporting pieces which are oppositely arranged, wherein bayonets for mounting shift fork shaft sleeves are arranged at the upper ends of the supporting pieces, the bayonets arranged at the upper ends of the two supporting pieces are flush with each other, the pressing mechanism is provided with a pressing piece for pressing a shifting fork shaft sleeve, the flexible spreading component comprises a mounting table and a wedge-shaped flexible ejecting piece, the flexible ejection piece is vertically and movably arranged on the mounting table, the mounting table is also provided with a sliding block which slides transversely, the slider with flexible ejecting piece cooperate, the slider on be provided with the briquetting that is used for compressing tightly the shift fork foot of shifting, the lower extreme of flexible ejecting piece is provided with its vertical removal of drive piece.

Furthermore, the pressing mechanism comprises a first fixed column, a first hinge seat is arranged at the upper end of the first fixed column, the first hinge seat is hinged with one end of a first movable rod, the other end of the first movable rod is fixed with the pressing piece, the middle of the first movable rod is hinged with one end of a first intermediate rod, a first wrench is hinged on the first hinge seat, and the other end of the first intermediate rod is hinged with the first wrench; the advantage lies in can realizing the locking and the unblock that compress tightly the piece through the cooperation of the articulated seat of first spanner, second, first fly leaf and the first intermediate lever that sets up to the guarantee compresses tightly the reliable of a pair shift fork, only can realize locking and unblock through first spanner, improves hold-down mechanism's easy and simple to handle nature.

Furthermore, the pressing piece is detachably arranged at the front end of the first movable rod and is made of rubber; the advantage lies in can ensure the press mechanism through the piece that compresses tightly of the rubber material that sets up and the rigid counterbalance contact of shift fork in locking or unblock in-process to reliably ensure the integrality of shift fork, avoid weighing wounded.

Furthermore, sliding tables are arranged on two sides of the mounting table, the sliding block transversely slides along the sliding tables, an inclined surface is arranged at one end of the sliding block, which is matched with the flexible ejection piece, and the inclined surface is attached to the flexible ejection piece; the advantage lies in through the slip table that sets up and the gliding stability of guarantee slider, makes it slide along slip table length direction reliably, and the inclined plane that sets up simultaneously can ensure with the reliable laminating of wedge flexible ejecting piece when guaranteeing flexible ejecting piece rebound oppress the slider to both sides limit removal.

Furthermore, the sliding table is fixedly provided with a fixed rod along the length direction of the sliding table, a compression spring is sleeved outside the fixed rod, one end of the compression spring abuts against the sliding table, the other end of the compression spring abuts against the sliding block, and the sliding block is further provided with a limiting hole corresponding to the fixed rod; the advantage lies in can effectively ensure the laminating of slider and flexible ejecting piece through the pressure spring who sets up, thereby the slider that the in-process of guarantee flexible ejecting piece ordered about both sides in step struts to both sides and compresses tightly the shift fork foot of shifting.

Furthermore, the flexible ejection piece comprises a flexible cap and a connecting rod, the flexible cap is fixedly arranged at the upper end of the connecting rod, an installation groove is formed in the lower portion of the installation table, and the lower end of the connecting rod penetrates through the installation table and is located in the installation groove; the advantage lies in that the cooperation through the flexible cap that sets up and connecting rod can make flexible liftout piece vertical activity and upwards ejecting reliable.

Furthermore, the driving piece comprises a hinge rod and a hinge column, the hinge column is fixedly arranged on the upper end face of the base, one end of the hinge rod is hinged with the lower end of the connecting rod, and the middle of the hinge rod is hinged with the hinge column; the advantage lies in can upwards ejecting through the cooperation of the driving piece that sets up namely articulated pole and articulated post through the lever principle flexible ejecting piece.

Furthermore, the driving piece further comprises a locking mechanism, the locking mechanism comprises a second fixed column, a second hinged seat is arranged at the upper end of the second fixed column, the second hinged seat is hinged to one end of a second movable rod, the other end of the second movable rod is fixed to an auxiliary pressing piece, the auxiliary pressing piece is used for pressing the other end of the hinged rod, the middle of the second movable rod is hinged to one end of a second middle rod, a second wrench is hinged to the second hinged seat, and the other end of the second middle rod is hinged to the second wrench; the advantage lies in can realizing locking and the unblock to the hinge rod through the supplementary press mechanism that sets up to realize the locking of flexible ejecting piece after the rebound targets in place, only can realize the operation through the second spanner, simple and convenient and operate reliably.

Furthermore, two sides of the supporting piece which are oppositely arranged are provided with the baffle plates, one of the two baffle plates is provided with the auxiliary pressing mechanism, the auxiliary pressing mechanism comprises an auxiliary pressing rod, the auxiliary pressing rod penetrates through the baffle plates, the front end of the auxiliary pressing rod is provided with the pressing head, the outer side of the auxiliary pressing rod is provided with the auxiliary spring, and two ends of the auxiliary spring are respectively abutted against the baffle plates and the pressing head; the gear shifting fork shaft sleeve has the advantages that the baffle plate can play a role in limiting when the gear shifting fork shaft sleeve is installed, and can play a role in guiding installation, so that the operation reliability and efficiency of operators are improved; and the auxiliary pressing rod can axially press the shifting fork shaft sleeve, so that the transverse movement of the shifting fork shaft sleeve is further avoided.

Furthermore, a coaxial detection assembly is further arranged on the upper end face of the base and comprises two coaxial fixing columns which are oppositely arranged, flush mounting openings are formed in the upper ends of the coaxial fixing columns, mounting plates are arranged on two sides of each of the two coaxial fixing columns, test rods located on the same axis are arranged at the upper ends of the mounting plates, the test rods movably penetrate through the mounting plates, ball heads are arranged at the front ends of the test rods, sleeves are arranged at the rear ends of the test rods, and the sleeves are sleeved at the end portions of the shifting fork shaft sleeves; the advantage lies in can effectively improving the detection function that the shift fork examined the utensil through the coaxial determine module that sets up, integrates multiple functions promptly on same base, improves the detection efficiency that the shift fork examined the utensil, can carry out different performance detection at same station to reduce the cost of labor and the equipment cost of enterprise.

Compared with the prior art, the utility model discloses following beneficial effect has: can carry out the fixed clamp to the shift fork axle sleeve through the centre gripping subassembly that sets up on the base and press from both sides tightly, hold-down mechanism's the piece that compresses tightly adopts the rubber material to constitute simultaneously, can avoid compressing tightly the piece and rigidly compressing tightly and the crushing that causes the shift fork that shifts, further improve the life of shift fork in the in-service use. Still need fix the shift fork foot of shifting in the testing process of reality to prevent that it from rotating around the axis of the shift fork axle sleeve of shifting, this application is provided with flexible ejecting piece on the base, compresses tightly the shift fork foot of shifting through the cooperation drive briquetting of flexible ejecting piece and slider, realizes that the flexibility compresses tightly, avoids appearing the crushing, and easy operation makes things convenient for operating personnel to detect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described 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 that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the usage state of the present invention;

FIG. 2 is a schematic view of the overall structure of the present invention;

fig. 3 is a schematic view of the installation position of the clamping assembly of the present invention;

fig. 4 is a schematic structural view of the pressing mechanism of the present invention;

fig. 5 is a schematic structural view of the flexible spreading assembly of the present invention;

fig. 6 is a schematic sectional structure view of the mounting table of the present invention;

fig. 7 is a schematic structural view of a conventional shift fork.

Detailed Description

The present invention is described in further detail below with reference to fig. 1 to 7.

The following description is provided to disclose the invention and to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or position relative to one another as illustrated in the figures, which is intended merely to simplify the description of the present invention and does not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above terms are not to be considered as limiting.

1-7 a utensil is examined to shift fork for car, including base 1, 1 up end of base is provided with clamping component 2 and flexible subassembly 3 that struts, clamping component 2 includes hold-down mechanism 2.1 and two supports 2.2 of relative setting, the upper end of two supports 2.2 all is provided with the bayonet socket 2.21 that is used for installing shift fork axle sleeve 6.1, the bayonet socket 2.21 that two supports 2.2 upper ends were seted up flushes mutually to guarantee to shift fork 6 and install when examining the utensil keep the level. The pressing mechanism 2.1 is provided with a pressing piece 2.16 for pressing the shift fork shaft sleeve 6.1, and more specifically, the pressing mechanism 2.1 includes a first fixed column 2.11, the upper end of the first fixed column 2.11 is provided with a first hinged seat 2.12, the first hinged seat 2.12 is hinged to one end of a first movable rod 2.13, the other end of the first movable rod 2.13 is fixed to the pressing piece 2.16, preferably, the pressing piece 2.16 is detachably arranged at the front end of the first movable rod 2.13, the pressing piece 2.16 is made of rubber, and the rubber pressing piece can ensure that the pressing mechanism is in rigid abutting contact with the shift fork 6 in the locking or unlocking process, so that the integrity of the shift fork 6 is reliably ensured, and the pressing injury is avoided. Meanwhile, the middle part of the first movable rod 2.13 is hinged with one end of the first middle rod 2.14, the first hinged seat 2.12 is also hinged with a first wrench 2.15, and the other end of the first middle rod 2.14 is hinged with the first wrench 2.15; the locking and unlocking of the pressing piece 2.16 can be realized through the matching of the first wrench 2.15, the second hinge seat 4.4, the first movable plate and the first intermediate rod 2.14, so that the reliable pressing of the pressing piece 2.16 on the shift fork 6 is guaranteed, the locking and unlocking can be realized only through the first wrench 2.15, and the operation simplicity of the pressing mechanism 2.1 is improved.

For the simple and convenient quick location installation of guarantee shift fork, the both sides of the support piece 2.2 of above-mentioned relative setting all are provided with baffle 2.22, two one of baffle 2.22 is provided with supplementary hold-down mechanism 2.3, and supplementary hold-down mechanism 2.3 includes supplementary compressing tightly pole 2.31, and supplementary compressing tightly pole 2.31 runs through baffle 2.22, and supplementary compressing tightly pole 2.31's front end is provided with hold-down head 2.32, the outside of supplementary compressing tightly pole is provided with supplementary spring 2.34, supplementary spring 2.34's both ends offset with baffle 2.22, hold-down head 2.32 respectively, are provided with the handle 2.33 of anticreep and are convenient for tensile supplementary compressing tightly pole 2.31 at the other end of compressing tightly pole.

Need fix the clamp tightly to the shift fork foot 6.2 of C shape in the shift fork performance testing process of shifting, still can detect its C-shaped opening degree simultaneously, be provided with flexible subassembly 3 that struts for this reason on base 1. The flexible spreading component 3 comprises an installation platform 3.1 and a wedge-shaped flexible ejecting piece 3.9, the flexible ejecting piece 3.9 is vertically and movably arranged on the installation platform 3.1,

all be provided with slip table 3.3 in the both sides of mount table 3.1, slider 3.6 is along slip table 3.3 lateral sliding, slider 3.6 and flexible liftout 3.9 matched with one end are provided with the inclined plane, and the inclined plane is laminated with flexible liftout 3.9 mutually, still is provided with the briquetting 3.8 that is used for compressing tightly shift fork foot 6.2 on slider 3.6.

For the rigid pressure injury of improving the flexible pressure reliability that struts subassembly 3 and avoiding sliding gear shift fork, foretell flexible ejecting piece 3.9 includes flexible cap 3.91 and connecting rod 3.92, and flexible cap 3.91 is fixed to be set up in the upper end of connecting rod 3.92, and mounting groove 3.2 has been seted up to the lower part of mount table 3.1, and the lower extreme of connecting rod 3.92 runs through mount table 3.1 and is located mounting groove 3.2. The flexible cap 3.91 may be made of a softer material such as rubber, silicone, and elastic plastic.

Meanwhile, a driving piece and a locking mechanism 4 are arranged at the lower end of the connecting rod 3.92, the driving piece comprises a hinge rod 4.1 and a hinge column 4.2, the hinge column 4.2 is fixedly arranged on the upper end face of the base 1, one end of the hinge rod 4.1 is hinged with the lower end of the connecting rod 3.92, and the middle of the hinge rod 4.1 is hinged with the hinge column 4.2; the locking mechanism 4 comprises a second fixed column 4.3, a second hinged seat 4.4 is arranged at the upper end of the second fixed column 4.3, the second hinged seat 4.4 is hinged with one end of a second movable rod 4.5, the other end of the second movable rod 4.5 is fixed with an auxiliary pressing piece 4.7, the auxiliary pressing piece 4.7 is used for pressing the other end of the hinged rod 4.1, the middle part of the second movable rod 4.5 is hinged with one end of a second intermediate rod 4.6, a second wrench 4.8 is further hinged on the second hinged seat 4.4, and the other end of the second intermediate rod 4.6 is hinged with the second wrench 4.8; the auxiliary pressing machine mechanism can lock and unlock the hinged rod 4.1, so that the flexible ejection piece 3.9 can be locked after moving upwards in place, the operation can be realized only through the second wrench 4.8, and the operation is simple, convenient and reliable.

In order to ensure the reliable movement of the sliding block 3.6 on the sliding table 3.3, a fixed rod 3.4 is fixedly arranged on the sliding table 3.3 along the length direction of the sliding table, a compression spring 3.5 is sleeved outside the fixed rod 3.4, one end of the compression spring 3.5 is abutted against the sliding table 3.3, the other end of the compression spring is abutted against the sliding block 3.6, and the sliding block 3.6 is also provided with a limit hole 3.7 corresponding to the fixed rod 3.4; can effectively ensure the laminating of slider 3.6 and flexible ejecting 3.9 through the pressure spring 3.5 that sets up, thereby the slider 3.6 that the assurance flexible ejecting 3.9 ordered about both sides in step at the in-process of rebound struts to both sides and compresses tightly shift fork foot 6.2.

In order to improve the detection function and the detection efficiency of the shifting fork 6 detection tool, a coaxial detection assembly 5 is further arranged on the upper end face of the base 1, the coaxial detection assembly 5 comprises two coaxial fixing columns 5.1 which are oppositely arranged, flush mounting ports 5.2 are formed in the upper ends of the coaxial fixing columns 5.1, mounting plates 5.3 are arranged on two sides of each of the two coaxial fixing columns 5.1, testing rods 5.4 located on the same axis are arranged on the upper ends of the mounting plates 5.3, the testing rods 5.4 movably penetrate through the mounting plates 5.3, a ball head 5.5 is arranged at the front ends of the testing rods 5.4, a sleeve 5.6 is arranged at the rear ends of the testing rods 5.4, the sleeve 5.6 is sleeved on the end portion of the shifting fork shaft sleeve 6.1, a testing spring 5.7 can be arranged on the outer side of the testing rods 5.4, and two ends of the testing spring 5.7 are respectively abutted against the sleeve 5.6 and the mounting rods; can effectively improve the detection function that shift fork 6 examined the utensil through the coaxial determine module 5 that sets up, integrate multiple functions promptly on same base 1, improve the detection efficiency that shift fork 6 examined the utensil, can carry out different performance detection at same station to reduce the cost of labor and the equipment cost of enterprise.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the invention have been shown and described in the embodiments, and any variations or modifications of the embodiments of the invention are possible without departing from the principles.

Claims (10)

1. A shifting fork detection tool for an automobile comprises a base (1) and is characterized in that a clamping assembly (2) and a flexible opening assembly (3) are arranged on the upper end face of the base (1), the clamping assembly (2) comprises a pressing mechanism (2.1) and two supporting pieces (2.2) which are oppositely arranged, bayonets (2.21) for mounting shifting fork shaft sleeves (6.1) are arranged at the upper ends of the supporting pieces (2.2), the bayonets (2.21) formed at the upper ends of the two supporting pieces (2.2) are flush with each other, the pressing mechanism (2.1) is provided with a pressing piece (2.16) for pressing the shifting fork shaft sleeves (6.1), the flexible opening assembly (3) comprises a mounting table (3.1) and a wedge-shaped flexible ejecting piece (3.9), the flexible ejecting piece (3.9) is vertically and movably arranged on the mounting table (3.1), and a sliding block (3.6) which transversely slides is further arranged on the mounting table (3.1), slider (3.6) with flexible liftout piece (3.9) cooperate, slider (3.6) on be provided with briquetting (3.8) that are used for compressing tightly shift fork foot (6.2) of shifting, the lower extreme of flexible liftout piece (3.9) is provided with the driving piece of its vertical removal of drive.

2. The checking fixture for the shift fork of the automobile according to claim 1, wherein the pressing mechanism (2.1) comprises a first fixed column (2.11), a first hinged seat (2.12) is arranged at the upper end of the first fixed column (2.11), the first hinged seat (2.12) is hinged to one end of a first movable rod (2.13), the other end of the first movable rod (2.13) is fixed to a pressing piece (2.16), the middle of the first movable rod (2.13) is hinged to one end of a first intermediate rod (2.14), a first wrench (2.15) is further hinged to the first hinged seat (2.12), and the other end of the first intermediate rod (2.14) is hinged to the first wrench (2.15).

3. The checking fixture for the shift fork of the automobile according to claim 2, wherein the pressing member (2.16) is detachably arranged at the front end of the first movable rod (2.13), and the pressing member (2.16) is made of rubber.

4. The automobile gear shifting fork detection tool according to claim 1, wherein sliding tables (3.3) are arranged on two sides of the mounting table (3.1), the sliding block (3.6) transversely slides along the sliding tables (3.3), an inclined surface is arranged at one end, matched with the flexible ejection piece (3.9), of the sliding block (3.6), and the inclined surface is attached to the flexible ejection piece (3.9).

5. The automobile gear shifting fork detection tool according to claim 4, wherein the sliding table (3.3) is fixedly provided with a fixing rod (3.4) along the length direction of the sliding table, a compression spring (3.5) is sleeved outside the fixing rod (3.4), one end of the compression spring (3.5) abuts against the sliding table (3.3), the other end of the compression spring abuts against the sliding block (3.6), and the sliding block (3.6) is further provided with a limiting hole (3.7) corresponding to the fixing rod (3.4).

6. The checking fixture for the shift fork of the automobile according to claim 1, characterized in that the flexible ejection member (3.9) comprises a flexible cap (3.91) and a connecting rod (3.92), the flexible cap (3.91) is fixedly arranged at the upper end of the connecting rod (3.92), an installation groove (3.2) is formed in the lower portion of the installation table (3.1), and the lower end of the connecting rod (3.92) penetrates through the installation table (3.1) and is located in the installation groove (3.2).

7. The checking fixture for the shift fork of the automobile according to claim 6, wherein the driving member comprises a hinge rod (4.1) and a hinge post (4.2), the hinge post (4.2) is fixedly arranged on the upper end face of the base (1), one end of the hinge rod (4.1) is hinged to the lower end of the connecting rod (3.92), and the middle of the hinge rod (4.1) is hinged to the hinge post (4.2).

8. The automobile gear shifting fork detection tool according to claim 7, wherein the driving member further comprises a locking mechanism (4), the locking mechanism (4) comprises a second fixed column (4.3), a second hinged seat (4.4) is arranged at the upper end of the second fixed column (4.3), the second hinged seat (4.4) is hinged to one end of a second movable rod (4.5), the other end of the second movable rod (4.5) is fixed to an auxiliary pressing piece (4.7), the auxiliary pressing piece (4.7) is used for pressing the other end of the hinged rod (4.1), the middle of the second movable rod (4.5) is hinged to one end of a second intermediate rod (4.6), a second wrench (4.8) is further hinged to the second hinged seat (4.4), and the other end of the second intermediate rod (4.6) is hinged to the second wrench (4.8).

9. The automobile gear shifting fork detection tool according to claim 1, wherein two sides of the support piece (2.2) which are arranged oppositely are provided with baffle plates (2.22), one of the two baffle plates (2.22) is provided with an auxiliary pressing mechanism (2.3), the auxiliary pressing mechanism (2.3) comprises an auxiliary pressing rod (2.31), the auxiliary pressing rod (2.31) penetrates through the baffle plates (2.22), the front end of the auxiliary pressing rod (2.31) is provided with a pressing head (2.32), the outer side of the auxiliary pressing rod (2.31) is provided with an auxiliary spring, and two ends of the auxiliary spring are respectively abutted against the baffle plates (2.22) and the pressing head (2.32).

10. The automobile shift fork detection tool according to claim 1, characterized in that a coaxial detection assembly (5) is further arranged on the upper end surface of the base (1), the coaxial detection assembly (5) comprises two coaxial fixing columns (5.1) which are oppositely arranged, flush mounting ports (5.2) are formed in the upper ends of the coaxial fixing columns (5.1), mounting plates (5.3) are arranged on two sides of the two coaxial fixing columns (5.1), a test rod (5.4) located on the same axis is arranged at the upper end of each mounting plate (5.3), the test rod (5.4) movably penetrates through the mounting plates (5.3), a ball head (5.5) is arranged at the front end of each test rod (5.4), a sleeve (5.6) is arranged at the rear end of each test rod (5.4), and the sleeve (5.6) is sleeved on the end portion of a shift fork shaft sleeve (6.1).

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