Wheel set of power battery test equipment

Abstract

The invention discloses a power battery test equipment wheel set. The power battery test equipment wheel set comprises a manual adjusting mechanism, a protection mechanism and a pulley, the pulley is used for changing the direction of the binding cable and assisting in binding the power battery; the manual adjusting mechanism is used for adjusting the pitching position of the pulley; the protection mechanism comprises a trigger assembly and a setting assembly, and the protection mechanism judges whether the power battery is loosened or not in a test through the trigger assembly and performs auxiliary tensioning on the pulley in combination with the setting assembly when the power battery is loosened. Through the arrangement of the protection mechanism, when some cables are loosened due to deformation and the like, the pulley can be pulled inwards, and therefore the purpose that auxiliary tensioning can still be achieved after binding is loosened is achieved; the whole device does not need to be matched with electronic equipment such as a sensor, and is more suitable for testing, verification and other environments with potential safety hazards.

Description

Technical Field

[0001] The present invention relates to the technical field of tools, and particularly to a wheel set of a power battery testing device. Background Art

[0002] With the popularization of new energy vehicles, the use of power batteries has become increasingly popular. Before being officially installed, power batteries need to undergo strict tests, such as charge and discharge tests, flipping tests, etc. During some tests, the battery needs to be fixed. When bundling with wire harnesses, it often needs to change the direction through pulleys. However, the current pulleys cannot adjust their angles according to actual situations, which may sometimes cause inconvenience in bundling. Moreover, the current pulleys cannot assist in tensioning. If tensioning can be assisted at the position of direction change, bundling can be completed better and faster. In addition, the current pulleys lack protection ability and cannot perform secondary tightening when loosening occurs. Summary of the Invention

[0003] The present invention aims at the problems existing in the prior art and provides a wheel set of a power battery testing device.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a wheel set of a power battery testing device, including a manual adjustment mechanism, a protection mechanism, and a pulley; the pulley is used to change the direction of the bundled cable and assist in bundling the power battery; the manual adjustment mechanism is used to adjust the pitching position of the pulley; the protection mechanism includes a trigger component and a setting component. The protection mechanism determines whether loosening occurs during the power battery test through the trigger component, and when loosening occurs, it combines with the setting component to assist in tightening the pulley.

[0005] Preferably, the manual adjustment mechanism includes a mounting member, an operating member, a ratchet wheel, and a main shaft. The mounting member includes a bottom plate and side plates on both sides. Lifting portions are provided at the ends of the side plates on both sides of the mounting member, and a lower clamping plate is provided at the middle position of the inner bottom plate of the mounting member. A through groove is provided on the lower clamping plate, and one end of a clamping spring guide rod is slidably disposed in the through groove. A lower clamping spring is wound around the clamping spring guide rod. One end of the lower clamping spring is fixedly connected to the lower clamping plate, and the other end is fixedly connected to a lower clamping block. At the same time, the lower clamping block is fixedly connected to the other end of the clamping spring guide rod. Both sides of the lower clamping block pass through corresponding sliding grooves provided on the side plates on both sides of the mounting member and extend outside the mounting member. A main shaft is rotatably provided between the side plates on both sides at the rear of the mounting member. Ratchet wheels fixedly connected thereto are provided on both sides of the main shaft. The ratchet wheels cooperate with the portions of the lower clamping blocks extending outside the mounting member and can be clamped by them. An operating member coaxial with the main shaft is rotatably provided outside the ratchet wheels. An upper clamping plate is fixedly provided at one end of the operating member away from the main shaft. An opening is provided on the upper clamping plate, and a protruding portion provided at the upper end of the auxiliary plate main body is slidably disposed in the opening. An upper clamping spring is also wound around the outside of the protruding portion. One end of the upper clamping spring is fixedly connected to the upper clamping plate, and the other end is fixedly connected to the auxiliary plate main body. Both sides of the auxiliary plate main body are slidably disposed in the slots on both sides of the operating member. Upper clamping blocks are respectively fixedly connected to both sides of the lower end of the auxiliary plate main body. The upper clamping blocks respectively cooperate with the corresponding ratchet wheels to clamp the ratchet wheels. An outer pushing portion for pushing the lower clamping block away from the ratchet wheel at a specific position is further provided at the end of the operating member. The lifting portion synchronously pushes the upper clamping block away from the ratchet wheel at this position. The protection mechanism is fixedly provided on the middle portion of the main shaft, and a handle is further fixedly provided at one end of the operating member away from the main shaft.

[0006] Preferably, the setting assembly of the protection mechanism includes a pulley seat, a setting shaft, a fixing rod, a spring seat, a spring, a guiding block, and a fixing seat. The setting shaft passes through a through hole provided in the middle of the main shaft and is slidably connected to the main shaft. The upper end of the setting shaft passes through the fixing seat and is threadedly connected to the fixing seat. Fixing rods are fixedly provided on both sides of the lower end of the fixing seat, and the lower ends of the fixing rods are fixedly connected to the main shaft. A spring seat is fixedly provided at the top of the setting shaft. One end of a spring is fixedly connected to the upper end of the spring seat, and the other end of the spring is fixedly connected to the lower end surface of the pulley seat. The pulley seat has a U-shaped structure. A through groove is provided at the bottom of the pulley seat, and one end of a guiding block is slidably connected in the through groove. The other end of the guiding block is fixedly connected to the upper end surface of the fixing seat. A screwing head is provided at the lower end of the setting shaft passing through the main shaft.

[0007] Preferably, the triggering assembly of the protection mechanism includes a main bevel gear, a sub-bevel gear, a triggering sleeve, a triggering shaft and a pulley shaft. The pulley shaft is rotatably arranged between the upper ends on both sides of the pulley seat. A pulley is fixedly arranged in the middle of the pulley shaft. Main bevel gears are fixedly arranged at both ends of the pulley. A separable sub-bevel gear is arranged below the main bevel gear. The sub-bevel gear is detachably arranged on the triggering shaft. A through hole for slidably connecting with the triggering shaft is arranged in the middle of the sub-bevel gear. A fixing pin for fixing the sub-bevel gear on the triggering shaft is also arranged on the sub-bevel gear. The triggering shaft passes through the through hole arranged at the bottom of the pulley seat. The lower end of the triggering shaft extends out of the pulley seat and a pin is arranged on the outside. The triggering shaft is rotatably connected with the pulley seat. A triggering sleeve is arranged on the outside of the lower end of the triggering shaft. The triggering sleeve is fixedly connected with the fixed seat. A plurality of uniformly distributed U-shaped grooves for the pin to move are arranged on the inner side of the triggering sleeve. The number of the U-shaped grooves corresponds to the number of the pins arranged on the outside of the triggering shaft.

[0008] Preferably, shielding pieces for preventing the binding cable from slipping out of both sides of the pulley are fixedly arranged on both sides of the pulley.

[0009] Preferably, the main bevel gear and the sub-bevel gear are replaced with different tooth ratios according to different situations so as to change the triggering difficulty.

[0010] The beneficial effects of the present invention are as follows:

[0011] 1. The wheel set of the present invention can complete the direction change of the binding cable through the pulley and assist in binding the power battery during the experimental test of the power battery. The initial position of the pulley can be adjusted through the manual adjustment mechanism, or the cable can be further tensioned through this mechanism after the binding is completed, so as to assist in fixing the power battery, thereby realizing multi-point tensioning and further improving the stability of the binding. 2. The setting of the protection mechanism can pull the pulley inward when some cables are deformed and loosened, so as to achieve the purpose of still being able to assist in tensioning after the binding is loosened. 3. The whole wheel set of the present invention does not need to cooperate with electronic devices such as sensors, and is more suitable for use in environments with potential safety hazards such as testing and verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the overall structural schematic diagram of a wheel set of a power battery testing device of the present invention;

[0013] Figure 2 is the overall structural schematic diagram of another angle of a wheel set of a power battery testing device of the present invention;

[0014] Figure 3 is Figure 1 the structural schematic diagram after removing some components;

[0015] Figure 4 It is the front view of a wheel set of a power battery testing device of the present invention;

[0016] Figure 5 It is the side view of a wheel set of a power battery testing device of the present invention;

[0017] Figure 6 It is the structural schematic diagram of the "trigger sleeve" of the present invention.

[0018] Among them, 10 - mounting piece, 11 - operating piece, 12 - lower clamping block, 13 - clamping spring guide rod, 14 - lower clamping spring, 15 - pulley, 16 - shielding piece, 17 - pulley seat, 18 - main bevel gear, 19 - secondary bevel gear, 20 - ratchet, 21 - main shaft, 22 - upper clamping block, 23 - upper clamping spring, 24 - trigger sleeve, 25 - trigger shaft, 26 - setting shaft, 27 - fixing rod, 28 - tension spring seat, 29 - tension spring, 30 - guiding block, 31 - outer pushing part, 32 - lifting part, 33 - lower clamping plate, 34 - upper clamping plate, 35 - auxiliary plate, 36 - handle, 37 - fixing seat, 38 - pulley shaft. Specific implementation manner

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0020] As Figures 1-6 shown, a wheel set of a power battery testing device includes a manual adjustment mechanism, a protection mechanism and a pulley 15; the pulley 15 is used to realize the direction change of the binding cable and assist in binding the power battery; the manual adjustment mechanism is used to adjust the pitching position of the pulley 15; the protection mechanism includes a trigger assembly and a setting assembly, and the protection mechanism judges whether there is looseness in the power battery test through the trigger assembly, and combines the setting assembly to assist in tightening the pulley 15 when looseness occurs.

[0021] The manual adjustment mechanism includes a mounting member 10, an operating member 11, a ratchet 20 and a spindle 21; the mounting member 10 includes a bottom plate and side plates on both sides, a lifting portion 32 is provided at the ends of the side plates on both sides of the mounting member 10, and a lower clamping plate 33 is provided at the middle position of the bottom plate inside the mounting member 10; a through groove is provided on the lower clamping plate 33, and one end of a clamping spring guide rod 13 is slidably provided in the through groove, and a lower clamping spring 14 is wound around the clamping spring guide rod 13; one end of the lower clamping spring 14 is fixedly connected to the lower clamping plate 33, and the other end is fixedly connected to the lower clamping block 12, and the lower clamping block 12 is fixedly connected to the other end of the positioning spring guide rod 13; the two sides of the lower clamping block 12 pass through the corresponding slide grooves set on the side plates on both sides of the mounting member 10 and extend out of the mounting member 10; a main shaft 21 is also rotatably set between the two side plates on the rear side of the mounting member 10, and ratchet wheels 20 fixedly connected thereto are set on both sides of the main shaft 21, and the ratchet wheels 20 cooperate with the part of the lower clamping block 12 extending out of the mounting member 10 and can be stuck therein; the ratchet wheels 21 0 is also rotatably provided with an operating member 11 coaxial with the main shaft 21 on the outer side, and an upper clamping plate 34 is fixedly provided on the end of the operating member 11 away from the main shaft 21; an opening is provided on the upper clamping plate 34, and a protrusion provided on the upper end of the main board of the auxiliary plate 35 is slidably provided in the opening, and an upper clamping spring 23 is also wound around the outer side of the protrusion; one end of the upper clamping spring 23 is fixedly connected to the upper clamping plate 34, and the other end is fixedly connected to the main board of the auxiliary plate 35; openings on both sides of the main board of the auxiliary plate 35 are slidably provided on both sides of the operating member 11 In the groove, upper clamping blocks 22 are fixedly connected to both sides of the lower end of the main board of the auxiliary plate 35; the upper clamping blocks 22 cooperate with the corresponding ratchet wheels 20 respectively to clamp the ratchet wheels 20; the end of the operating member 11 is also provided with an outward pushing portion 31 for pushing the lower clamping block 12 away from the ratchet wheel 20 at a specific position, and the lifting portion 32 simultaneously pushes the upper clamping block 22 away from the ratchet wheel 20 at this position; a protective mechanism is fixedly provided on the middle part of the main shaft 21, and a handle 36 is also fixedly provided on the end of the operating member 11 away from the main shaft 21. When it is necessary to drive the main shaft 21 to rotate and thus adjust the position of the protection mechanism, by pulling the handle 36, the operating member 11 drives the upper clamping block 22 to turn the ratchet 20 through the control auxiliary plate 35, thereby rotating the main shaft 21, and the operating member 11 can be reset after rotating an angle; during the resetting process, the ratchet 20 will be stuck by the lower clamping block 12, and the upper clamping block 22 will continuously reset along the inclined surface of the ratchet 20 under the action of the upper clamping spring 23; when the upper clamping block 22 drives the ratchet 20 to rotate, the lower clamping block 12 cannot clamp the ratchet 20; when it is necessary to reset the protection mechanism, the operating member 11 is opened to a horizontal state, at which time the lifting portion 32 will lift the upper clamping block 22, and the outward pushing portion 31 of the operating member 11 will simultaneously push the lower clamping block 12 away from the ratchet 20, at which time the ratchet 20 loses its restriction, and the position of the protection mechanism can be adjusted arbitrarily according to needs.

[0022] The setting component of the protection mechanism includes a pulley seat 17, a setting shaft 26, a fixing rod 27, a spring seat 28, a spring 29, a guiding block 30 and a fixing seat 37; the setting shaft 26 passes through a through hole provided in the middle of the main shaft 21 and is slidably connected to the main shaft 21, the upper end of the setting shaft 26 passes through the fixing seat 37 and is threadedly connected to the fixing seat 37; both sides of the lower end of the fixing seat 37 are fixedly provided with fixing rods 27, and the lower ends of the fixing rods 27 are fixedly connected to the main shaft 21; the top of the setting shaft 26 is fixedly provided with a spring seat 28, one end of the spring 29 is fixedly connected to the upper end of the spring seat 28, and the other end of the spring 29 is fixedly connected to the lower end face of the pulley seat 17; the pulley seat 17 is of a U-shaped structure, a through groove is provided at the bottom of the pulley seat 17, one end of the guiding block 30 is slidably connected in the through groove, and the other end of the guiding block 30 is fixedly connected to the upper end face of the fixing seat 37; a screwing head is provided at the lower end of the setting shaft 26 passing through the main shaft 21. When it is necessary to adjust the pulling force of the spring 29, the setting shaft 26 is rotated through the screwing head, so that the spring seat 28 moves to different positions to adjust the pulling force of the spring 29, and further the pulley seat 17 is kept in an inward contraction under the guiding action of the guiding block 30.

[0023] The triggering component of the protection mechanism includes a main bevel gear 18, a secondary bevel gear 19, a triggering sleeve 24, a triggering shaft 25, and a pulley shaft 38; the pulley shaft 38 is rotatably arranged between the upper ends on both sides of the pulley seat 17, and a pulley 15 is fixedly arranged in the middle of the pulley shaft 38; main bevel gears 18 are fixedly arranged at both ends of the pulley 15, a separable secondary bevel gear 19 is arranged below the main bevel gear 18, the secondary bevel gear 19 is detachably arranged on the triggering shaft 25, a through hole for slidably connecting with the triggering shaft 25 is arranged in the middle of the secondary bevel gear 19, and a fixing pin for fixing the secondary bevel gear 19 on the triggering shaft 25 is also arranged on the secondary bevel gear 19; the triggering shaft 25 passes through a through hole arranged at the bottom of the pulley seat 17, the lower end of the triggering shaft 25 extends outside the pulley seat 17 and a pin is arranged on the outside, and the triggering shaft 25 is rotatably connected with the pulley seat 17; a triggering sleeve 24 is arranged on the outside of the lower end of the triggering shaft 25, the triggering sleeve 24 is fixedly connected with the fixed seat 37, and a plurality of uniformly distributed U-shaped grooves for the pin to move are arranged on the inner side of the triggering sleeve 24, and the number of U-shaped grooves corresponds to the number of pins arranged on the outside of the triggering shaft 25. Initially, the pin is located at the upper end of the U-shaped groove. When the power battery is bound by the binding cable after being reversed by the pulley 15, the main bevel gear 18 is separated from the secondary bevel gear 19, and at this time, the protection mechanism will not be triggered. At this time, the pin at the end of the triggering shaft 25 is located at the upper end of the triggering sleeve 24, and the pulley seat 17 cannot slide up and down and is in a stable state. At this time, the power battery is firmly bound; then the secondary bevel gear 19 is slid to the top of the triggering shaft 25 and meshed with the main bevel gear 18, and the position of the secondary bevel gear 19 is fixed by the fixing pin; the magnitude of the inward force is set through the setting component. When the binding cable becomes loose, it will drive the pulley 15 to rotate by an angle. The rotation of the pulley 15 will cause the main bevel gear 18 to drive the secondary bevel gear 19 to make the pin on the triggering shaft 25 slide to the vertical positions on both sides of the U-shaped groove. At this time, the setting component will pull the pulley seat 17 to retract under the guiding action of the guiding block 30, thereby tightening the loose cable. When multiple sets of power battery test equipment wheels are tightened synchronously, the secondary fixing of the power battery can be well completed; the protection mechanism sets the pulling force through the setting component after the cable is bundled, and does not directly apply a pulling force to the cable when the triggering component is not triggered. The force of the cable bundle on the battery pack housing during the test is accurate. If the setting component directly pulls the pulley seat 17 to retract without triggering, the cable bundle will balance the pulling force of the setting component first during bundling, thereby affecting the test accuracy.

[0024] In one embodiment, shielding pieces 16 for preventing the binding cable from slipping out of both sides of the pulley 15 are fixedly arranged on both sides of the pulley 15.

[0025] In one embodiment, the main bevel gear 18 and the secondary bevel gear 19 are replaced with different tooth ratios according to different situations to change the triggering difficulty.

[0026] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A wheel set for power battery testing equipment, characterized in that: It comprises a manual adjustment mechanism, a protection mechanism and a pulley (15); the pulley (15) is used to change the direction of the binding cable and assist in binding the power battery; the manual adjustment mechanism is used to adjust the pitch position of the pulley (15); the protection mechanism comprises a trigger component and a setting component, the protection mechanism determines whether the power battery is loose during the test through the trigger component, and when looseness occurs, the pulley (15) is assisted in tightening in combination with the setting component.

2. A power battery testing equipment wheel assembly according to claim 1, characterized in that: The manual adjustment mechanism comprises a mounting member (10), an operating member (11), a ratchet (20) and a main shaft (21); the mounting member (10) comprises a bottom plate and side plates on both sides, and lifting portions (32) are arranged at the ends of the side plates on both sides of the mounting member (10), and a lower clamping plate (33) is arranged at the middle position of the bottom plate inside the mounting member (10); a through groove is arranged on the lower clamping plate (33), and one end of a clamping spring guide rod (13) is slidably arranged in the through groove, and a lower clamping spring (14) is wound around the clamping spring guide rod (13); one end of the lower clamping spring (14) is fixedly connected to the lower clamping plate (33), and the other end of the lower clamping spring (14) is fixedly connected to the lower clamping plate (33), and the other end of the lower clamping spring (14) is fixedly connected to the lower clamping plate (33). The end is fixedly connected to the lower clamping block (12), and the lower clamping block (12) is fixedly connected to the other end of the positioning spring guide rod (13); the two sides of the lower clamping block (12) pass through the corresponding sliding grooves arranged on the side plates on both sides of the mounting member (10) and extend out of the mounting member (10); a main shaft (21) is also rotatably arranged between the two side plates on the rear side of the mounting member (10), and ratchets (20) fixedly connected thereto are arranged on both sides of the main shaft (21), and the ratchet (20) cooperates with the part of the lower clamping block (12) extending out of the mounting member (10) and can be clamped by it; the outer side of the ratchet (20) is also rotatably arranged between the two side plates on the rear side of the mounting member (10). An operating member (11) coaxial with the main shaft (21) is movably provided, and an upper clamping plate (34) is fixedly provided on one end of the operating member (11) away from the main shaft (21); an opening is provided on the upper clamping plate (34), and a protrusion provided on the upper end of the main plate of the auxiliary plate (35) is slidably provided in the opening, and an upper clamping spring (23) is also wound around the outer side of the protrusion; one end of the upper clamping spring (23) is fixedly connected to the upper clamping plate (34), and the other end is fixedly connected to the main plate of the auxiliary plate (35); both sides of the main plate of the auxiliary plate (35) are slidably provided in the slots on both sides of the operating member (11), and the auxiliary plate ( 35) Upper clamping blocks (22) are fixedly connected to both sides of the lower end of the main board; the upper clamping blocks (22) cooperate with the corresponding ratchet wheels (20) to clamp the ratchet wheels (20); the end of the operating member (11) is also provided with an outward pushing portion (31) for pushing the lower clamping block (12) away from the ratchet wheel (20) at a specific position, and the lifting portion (32) simultaneously pushes the upper clamping block (22) away from the ratchet wheel (20) at this position; the protection mechanism is fixedly provided on the middle part of the main shaft (21), and a handle (36) is also fixedly provided on the end of the operating member (11) away from the main shaft (21).

3. A power battery testing equipment wheel assembly according to claim 2, characterized in that: When it is necessary to drive the main shaft (21) to rotate so as to adjust the position of the protection mechanism, the handle (36) is pulled to make the operating member (11) drive the upper clamping block (22) to turn the ratchet (20) by controlling the auxiliary plate (35), thereby rotating the main shaft (21), and the operating member (11) is reset after rotating an angle; during the reset process, the ratchet (20) is clamped by the lower clamping block (12), and the upper clamping block (22) is continuously moved along the inclined surface of the ratchet (20) on the upper clamping spring. (23); when the upper clamping block (22) drives the ratchet (20) to rotate, the lower clamping block (12) cannot clamp the ratchet (20); when it is necessary to reset the protection mechanism, the operating member (11) is opened to a horizontal state, at which time the lifting portion (32) lifts the upper clamping block (22), and the pushing portion (31) of the operating member (11) simultaneously pushes the lower clamping block (12) away from the ratchet (20), at which time the ratchet (20) is no longer restricted, and the position of the protection mechanism can be adjusted as required.

4. A power battery testing equipment wheel assembly according to claim 2, characterized in that: The setting assembly of the protection mechanism comprises a pulley seat (17), a setting shaft (26), a fixing rod (27), a tension spring seat (28), a tension spring (29), a guide block (30) and a fixing seat (37); the setting shaft (26) passes through a through hole provided in the middle of the main shaft (21) and is slidably connected to the main shaft (21); the upper end of the setting shaft (26) passes through the fixing seat (37) and is threadedly connected to the fixing seat (37); fixing rods (27) are fixedly provided on both sides of the lower end of the fixing seat (37); the lower end of the fixing rod (27) is connected to the main shaft (21) ) is fixedly connected; a tension spring seat (28) is fixedly arranged on the top of the setting shaft (26), the upper end of the tension spring seat (28) is fixedly connected to one end of a tension spring (29), and the other end of the tension spring (29) is fixedly connected to the lower end surface of the pulley seat (17); the pulley seat (17) is a U-shaped structure, and a through groove is arranged at the bottom of the pulley seat (17), one end of a guide block (30) is slidably connected in the through groove, and the other end of the guide block (30) is fixedly connected to the upper end surface of the fixed seat (37); the lower end of the setting shaft (26) passing through the main shaft (21) is provided with a screwing head.

5. A power battery testing equipment wheel assembly according to claim 4, characterized in that: When the tension of the tension spring (29) needs to be adjusted, the setting shaft (26) is rotated by a screwing head, so that the tension spring seat (28) moves to a different position, and the tension of the tension spring (29) is adjusted, thereby keeping the pulley seat (17) retracted under the guidance of the guide block (30).

6. A power battery testing equipment wheel assembly according to claim 4, characterized in that: The trigger assembly of the protection mechanism comprises a main bevel gear (18), a secondary bevel gear (19), a trigger sleeve (24), a trigger shaft (25) and a pulley shaft (38); the pulley shaft (38) is rotatably arranged between the upper ends of both sides of the pulley seat (17), and a pulley (15) is fixedly arranged in the middle of the pulley shaft (38); main bevel gears (18) are fixedly arranged at both ends of the pulley (15), a detachable secondary bevel gear (19) is arranged on the lower side of the main bevel gear (18), the secondary bevel gear (19) is detachably arranged on the trigger shaft (25), a through hole for sliding connection with the trigger shaft (25) is arranged in the middle of the secondary bevel gear (19), and the secondary bevel gear (19) is detachably arranged on the trigger shaft (25). 19) is also provided with a fixing pin for fixing the auxiliary bevel gear (19) to the trigger shaft (25); the trigger shaft (25) passes through a through hole provided at the bottom of the pulley seat (17); the lower end of the trigger shaft (25) extends out of the pulley seat (17) and is provided with a pin on the outer side; the trigger shaft (25) is rotatably connected to the pulley seat (17); a trigger sleeve (24) is provided on the outer side of the lower end of the trigger shaft (25); the trigger sleeve (24) is fixedly connected to the fixing seat (37); a plurality of evenly distributed U-shaped grooves for pin movement are provided on the inner side of the trigger sleeve (24); the number of the U-shaped grooves corresponds to the number of the pins provided on the outer side of the trigger shaft (25).

7. A power battery testing equipment wheel assembly according to claim 6, characterized in that: Initially, the pin is located at the upper end of the U-shaped groove. When the power battery is tied by the binding cable after the pulley (15) changes direction, the main bevel gear (18) and the auxiliary bevel gear (19) are separated. At this time, the protection mechanism will not be triggered. At this time, the pin at the end of the trigger shaft (25) is located at the upper end of the trigger sleeve (24). The pulley seat (17) cannot slide up and down and is in a stable state. At this time, the power battery is tied firmly; then the auxiliary bevel gear (19) is slid to the top of the trigger shaft (25) and is aligned with the main bevel gear (19). 8) meshing, fixing the position of the secondary bevel gear (19) by a fixing pin; setting the size of the retraction force by the setting component, when the binding cable becomes loose, it will drive the pulley (15) to rotate, and the rotation of the pulley (15) will cause the main bevel gear (18) to drive the secondary bevel gear (19) to make the pin on the trigger shaft (25) slide to the vertical positions on both sides of the U-shaped groove, at this time, the setting component will pull the pulley seat (17) to make it retract under the guidance of the guide block (30), thereby tightening the loose cable.

8. A power battery testing equipment wheel assembly according to any one of claims 1 to 7, characterized in that: Shielding plates (16) are fixedly arranged on both sides of the pulley (15) to prevent the bound cables from slipping out of the two sides of the pulley (15).

9. A power battery testing equipment wheel assembly according to claim 6, characterized in that: The main bevel gear (18) and the auxiliary bevel gear (19) are changed into different gear ratios according to different situations so as to change the difficulty of triggering.

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