Column impact test vehicle positioning method and lifting appliance

Abstract

The invention discloses a column impact test vehicle positioning method and tool, and the method comprises the steps: setting a vehicle gear and a hand brake, and dismounting a tire diagonal bolt; connecting the top end of the sling with the crown block, arranging a sling chain at the bottom end of the sling, and fixedly connecting a bolt hole of a vehicle through the sling chain; adjusting the length of a lifting chain and a lifting included angle, and lifting the vehicle to a preset height; moving the vehicle to a preset position through the crown block, and rotating the vehicle to a preset angle; and fixing the vehicle at the preset position, and detaching the connection between the sling chain and the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of pole impact test auxiliary tools, and in particular to a pole impact test vehicle positioning method and a lifting device. Background Art

[0002] During the preparation process for a pillar impact test, the test vehicle is placed on a dedicated slide and the vehicle's front, rear, left, and right angles are measured. During the initial impact test, the vehicle undergoes adjustments in both the front and rear directions, requiring multiple people to rock the vehicle to ensure the required adjustments (this is only the first step of the adjustment process). Once the dummy is positioned, the vehicle undergoes a second collision position adjustment, repeating the first step to ensure the vehicle's collision position meets the test requirements. The dummy's position is difficult to maintain at this point, and adjusting the vehicle's position becomes even more challenging after the test vehicle has been tested twice. Without this method, work efficiency is low, test quality is poor, labor costs are high, and post-test analysis of the collision results is affected, leading to test failures and project delays.

[0003] The current state of the pole impact test method is as follows: Automakers use a towing device to collide the test vehicle with an obstacle avoidance vehicle for performance testing. Speed ​​and overlap area are referenced, and each manufacturer utilizes different techniques during the test preparation phase. The current method has shortcomings: During test preparation, the test vehicle must be transported by a forklift and placed on the test platform. During this process, the forklift is used to support the front axle and then the rear axle for centerline adjustment. This allows only a rough positioning of the test vehicle to ensure the approximate position of the side impact with the pole. A dummy is placed inside the test vehicle and positioned. After the dummy is positioned, the vehicle must be repositioned to meet test regulations. At this point, the vehicle's front-to-back position deviates. During this adjustment, a slide is placed under the wheels to facilitate forward, backward, left, and right movement. While pushing the vehicle, the dummy experiences significant sway, causing the position to deviate. The test platform is towed to the pole barrier for final position confirmation. After adjustments are complete, the test vehicle is pushed off the slide. The test vehicle is pushed to the collision position again. If the vehicle body is not in the correct position, the vehicle is adjusted until the collision position of the test vehicle meets the test requirements. Because the slide contains solidified grease, the grease in the slide will be squeezed out during the vehicle's positioning (slides are required on all four wheels to achieve front, rear, left, and right displacement of the vehicle), and the grease will stick to the ground (the grease is not easy to remove). During the test, the tire friction coefficient decreases. After the vehicle is hit by the obstacle avoidance vehicle during the test, it will cause lateral displacement, resulting in an inaccurate collision position between the test vehicle and the obstacle avoidance vehicle, causing the test failure. The test process requires a large number of personnel and high test costs. Many tasks are reciprocating, resulting in low work efficiency. Summary of the Invention

[0004] In order to solve at least one aspect of the above-mentioned technical problems, an embodiment of the present invention provides a method for positioning a vehicle for a pole impact test, including: setting the vehicle gear and handbrake, and removing the diagonal bolts of the tires; connecting the top of the sling and the overhead crane, and providing a lifting chain at the bottom of the sling, and fixing the bolt holes connected to the vehicle through the lifting chain; adjusting the length of the lifting chain and the lifting angle, and lifting the vehicle to a preset height; moving the vehicle to a preset position by the overhead crane, and rotating the vehicle to a preset angle; fixing the vehicle at the preset position, and removing the connection between the lifting chain and the vehicle.

[0005] Preferably, the lifting chain includes a chain body and a wheel connecting assembly, the wheel connecting assembly includes a connecting plate, a fastening screw and a bolt fixing sleeve, the top of the connecting plate is fixedly connected to the chain body, and a connecting hole corresponding to the diagonal bolt of the tire is opened on the connecting plate, and the fastening screw passes through the connecting hole and is fixedly connected to the bolt fixing sleeve.

[0006] Preferably, the lifting chain further comprises a connecting lifting ring, which comprises a lifting ring body and a fixing piece. A lifting ring opening is provided at the bottom of the lifting ring body, and fixing holes for connecting the fixing piece are provided on both sides of the lifting ring opening.

[0007] Preferably, the sling also includes a support frame and a chain hook. The support frame includes a top plate, a bottom plate, a support plate and a fixed plate arranged in parallel. The top plate and the bottom plate are arranged in parallel. The support plate is fixedly arranged between the top plate and the bottom plate. The fixed plate is arranged at both ends of the top plate and the bottom plate. The inner side of the fixed plate is fixedly connected to the top plate, the bottom plate and the support plate, and the outer side of the fixed plate is fixedly connected to the chain hook.

[0008] On the other hand, a vehicle positioning hoist for a pole impact test is provided, including: a support frame, the support frame adopts a left-right symmetrical structure, and the top midpoint of the support frame is used to connect to a crane; a chain hook, including a left hook and a right hook, and the left hook and the right hook are symmetrically arranged at both ends of the support frame; a lifting chain, the lifting chain includes a symmetrically arranged left lifting chain and a right lifting chain, the lifting chain includes a chain body and a wheel connecting assembly, the top of the chain body is connected to the chain hook, and the bottom end of the chain body is connected to the wheel connecting assembly, the wheel connecting assembly includes a connecting plate, a fastening screw and a bolt fixing sleeve, the top of the connecting plate is fixedly connected to the chain body, and a connecting hole corresponding to the diagonal bolt of the tire is opened on the connecting plate, and the fastening screw is fixedly connected to the bolt fixing sleeve through the connecting hole.

[0009] Preferably, the support frame includes a top plate, a bottom plate, a support plate and a fixed plate arranged in parallel. The top plate and the bottom plate are arranged in parallel. The support plate is fixedly arranged between the top plate and the bottom plate. The fixed plate is arranged at both ends of the top plate and the bottom plate. The inner side of the fixed plate is fixedly connected to the top plate, the bottom plate and the support plate, and the outer side of the fixed plate is fixedly connected to the chain hook.

[0010] Preferably, the fixing plate further comprises a reinforcing plate, the reinforcing plate is fixedly arranged on the outer side of the fixing plate, and the chain hook is fixedly arranged on the reinforcing plate.

[0011] Preferably, the left hook includes a left front hook and a left rear hook, the fixed plate further includes a partition plate, the partition plate is vertically arranged on the outside of the fixed plate, and the left front hook and the left rear hook are respectively arranged on both sides of the partition plate.

[0012] Preferably, the lifting chain also includes a connecting lifting ring, which includes a lifting ring body and a fixing piece. A lifting ring opening is provided at the bottom of the lifting ring body, and fixing holes for connecting the fixing piece are provided on both sides of the lifting ring opening. A connecting through hole corresponding to the fixing hole is provided on the connecting plate.

[0013] The vehicle positioning method and hoist for pole impact test of the embodiment of the present invention have the following technical effects: by using special instruments and a complete set of test methods, the operation of the test is standardized and the quality is improved to carry out the method development. The correct test position of the vehicle angle is solved by using protected special instruments, and the operation during the test is standardized by the sequence of methods. The speed measuring instrument of the collision test is placed to solve the correct speed measurement value. The combination of actual vehicle testing and actual operation methods can not only more realistically reflect the actual state during the actual vehicle collision, but also optimize the efficiency of test preparation, and complete the pole collision verification simply and quickly, while reducing the risk of damaging the bottom sensor and vehicle body structure with a forklift. The data obtained after the test is more detailed, which is conducive to the energy absorption performance analysis of the test vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and have no limiting effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0015] Figure 1 A schematic diagram showing an application scenario of a vehicle positioning method for a pole impact test according to an embodiment of the present invention is shown;

[0016] Figure 2 A schematic diagram showing the application process of the method for positioning a vehicle in a pole impact test according to an embodiment of the present invention is shown;

[0017] Figure 3 A schematic structural diagram of a vehicle positioning hanger for a pole impact test according to an embodiment of the present invention is shown;

[0018] Figure 4 A structural explosion diagram of a vehicle positioning hanger for a pole impact test according to an embodiment of the present invention is shown.

[0019] Figure numerals: 1. Top plate; 2. Bottom plate; 3. Support plate; 4. Fixed plate; 5. Reinforcement plate; 6. Partition plate; 7. Chain hook; 8. Connecting ring; 9. Connecting plate; 10. Fastening screw; 11. Bolt fixing sleeve 12. Chain body; 13. Lifting rope connecting buckle; 100. Lifting device; 200. Overhead crane; 300. Slide; 400. Track; 500. Obstacle avoidance body. DETAILED DESCRIPTION

[0020] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0021] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0022] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure proposes a method for positioning a vehicle for a pole impact test, including: setting the vehicle gear and handbrake, and removing the diagonal bolts of the tires; connecting the top of the sling 100 and the overhead crane 200, and providing a lifting chain at the bottom of the sling 100, and fixing the bolt holes connected to the vehicle through the lifting chain; adjusting the length of the lifting chain and the lifting angle, and lifting the vehicle to a preset height; moving the vehicle to a preset position by the overhead crane 200, and rotating the vehicle to a preset angle; fixing the vehicle at the preset position, and removing the connection between the lifting chain and the vehicle.

[0023] Specifically, if Figure 2 As shown, the pole impact test process includes: installing the positioning sling 100; installing the pole impact test fixture; laying the track 400 and placing the test slide 300 next to the obstacle avoidance body 500; adjusting the impact angle and position, and placing the test vehicle on the test bench; removing the auxiliary equipment and pushing the slide 300 to the starting point; and placing the test vehicle on the ground after the test. During the pole impact test, adjusting the impact angle and position, and placing the test vehicle on the test bench require adjusting and moving the test vehicle according to the test requirements to achieve the correct positioning.

[0024] When positioning the test vehicle, first set the test vehicle's gear to P and engage the parking brake to mechanically lock the vehicle. Remove the diagonal bolt caps on the test vehicle's tires, adjusting the position according to the vehicle's actual conditions (all independent decorative caps must be removed). Then, remove the diagonal bolts on the test vehicle's wheel hubs. By removing the diagonal bolts on the test wheel, a connection point for the hoist 100 is reserved.

[0025] like Figure 1 As shown, the crane 200 and the sling 100 are also included. The crane 200 includes a crossbeam, a longitudinal beam, a drive mechanism, and a lifting mechanism. The crossbeam and longitudinal beam are arranged perpendicular to each other. The drive mechanism is used to drive the crossbeam along the longitudinal beam and the sling 100 along the longitudinal beam. The lifting mechanism is used to connect the sling 100 to move in the vertical direction. The drive mechanism includes a drive motor, a brake, and a coupling to drive the crossbeam and sling 100. The lifting mechanism includes a lifting motor, a reducer, a drum, a brake, etc. The lifting motor is connected to the reducer via a coupling and a brake wheel. The output shaft of the reducer is connected to the drum around which the wire rope is wound. The other end of the wire rope is connected to the sling 100. In another embodiment, the overhead crane 200 includes a crossbeam, a longitudinal beam, a driving mechanism and a lifting trolley. The driving mechanism is used to drive the crossbeam to move along the length direction of the longitudinal beam. The lifting trolley is movably arranged on the crossbeam. The lifting trolley includes a rotating mechanism and a lifting mechanism. The rotating mechanism is used to control the rotation angle of the lifting trolley so as to control the rotation angle of the lifting rope extended from the lifting trolley. The lifting mechanism is used to control the length of the lifting rope extended from the lifting trolley so as to adjust the lifting height of the sling 100 machine connected to the test vehicle. The lifting rope extended from the lifting trolley is a steel wire rope connected to the output shaft of the lifting mechanism.

[0026] Connect the top of the sling 100 to the overhead crane 200, and connect the bottom of the lifting chain of the sling 100 to the diagonal bolt holes of the test vehicle to enable the overhead crane 200 to move the test vehicle. Connect the wire rope (lifting rope) of the sling 100 to the overhead crane 200 (the lifting capacity of the lifting rope is 5000 kg, and the lifting capacity of the lifting rope after folding in half is twice that of the original lifting rope). Extend the lifting chain to its maximum length to ensure the lifting angle (the smaller the angle, the greater the lifting capacity and the better the stability). When confirming that the lifting is possible, relevant personnel should evacuate the lifting area and have a colleague to provide guidance. Ensure the lifting height is less than 10 cm from the truck, and control the lifting handle so that two controls cannot be operated simultaneously.

[0027] According to the test requirements, the test vehicle is moved by controlling the driving mechanism and lifting mechanism of the overhead crane 200, hoisted onto the pallet truck or test track 400, rotated to the required test angle, and lowered onto the pallet truck or test track 400. The vehicle is then secured at a preset position on the pallet truck or test track 400, and the connection between the hoisting chain and the vehicle is removed.

[0028] In some embodiments, the lifting chain includes a chain body 12 and a wheel connection assembly, the wheel connection assembly includes a connecting plate 9, a fastening screw 10 and a bolt fixing sleeve 11, the top of the connecting plate 9 is fixedly connected to the chain body 12, and a connecting hole corresponding to the diagonal bolt of the tire is opened on the connecting plate 9, and the fastening screw 10 passes through the connecting hole and is fixedly connected to the bolt fixing sleeve 11.

[0029] Specifically, the chain body 12 is used for the steel wire rope of the lifting mechanism of the overhead crane 200. The bottom end of the chain body 12 is fixedly connected to the wheel connection assembly. The fastening screws 10 and the bolt fixing sleeve 11 of the vehicle connection assembly are installed in the original vehicle bolt holes and can be driven in with an electric gun (the torque of the electric gun is 110N-140N, which meets the bolt torque requirements).

[0030] In some embodiments, the lifting chain further includes a connecting lifting ring 8, which includes a lifting ring body and a fixing piece. A lifting ring opening is provided at the bottom of the lifting ring body, and fixing holes for connecting the fixing piece are provided on both sides of the lifting ring opening.

[0031] Specifically, the connecting ring 8 is used to connect the top of the chain body 12 and the sling 100, and the ring opening is used to be fixedly connected to the connecting plate 9, so that the fixing part passes through the fixing hole of the ring body and the connecting plate 9 in turn to achieve a fixed connection between the connecting ring 8 and the connecting plate 9.

[0032] In some embodiments, the sling 100 also includes a support frame and a chain hook 7. The support frame includes a top plate 1, a bottom plate 2, a support plate 3 and a fixed plate 4 arranged in parallel. The top plate 1 and the bottom plate 2 are arranged in parallel. The support plate 3 is fixedly arranged between the top plate 1 and the bottom plate 2. The fixed plate 4 is arranged at both ends of the top plate 1 and the bottom plate 2. The inner side of the fixed plate 4 is fixedly connected to the top plate 1, the bottom plate 2 and the support plate 3, and the outer side of the fixed plate 4 is fixedly connected to the chain hook 7.

[0033] Specifically, the support frame of the sling 100 adopts a rigid structure, and the plates of the support frame are fixed by welding or integrally formed by a casting process to increase its stability. The chain hook 7 is used to connect the support frame and the chain body 12.

[0034] On the other hand, a pole impact test vehicle positioning hanger 100 is provided, including: a support frame, the support frame adopts a left-right symmetrical structure, and the top midpoint of the support frame is used to connect the overhead crane 200; a chain hook 7, including a left hook and a right hook, and the left hook and the right hook are symmetrically arranged at both ends of the support frame; a lifting chain, the lifting chain includes a symmetrically arranged left lifting chain and a right lifting chain, the lifting chain includes a chain body 12 and a wheel connecting assembly, the top of the chain body 12 is connected to the chain hook 7, and the bottom end of the chain body 12 is connected to the wheel connecting assembly, the wheel connecting assembly includes a connecting plate 9, a fastening screw 10 and a bolt fixing sleeve 11, the top of the connecting plate 9 is fixedly connected to the chain body 12, and a connecting hole corresponding to the diagonal bolt of the tire is opened on the connecting plate 9, and the fastening screw 10 is fixedly connected to the bolt fixing sleeve 11 through the connecting hole.

[0035] Specifically, if Figure 2 As shown, the test fixture includes a test track 400, a test board, and an obstacle avoidance system. The test board is used to place the test vehicle, and the obstacle avoidance system is set at a preset position on the test track 400. The test board moves along the test track 400, and the test vehicle placed on it collides with the obstacle to complete the pole impact test. The overhead crane 200 is located above the test track 400 and is connected to the positioning hoist 100 to achieve the movement and positioning of the test vehicle.

[0036] The support frame is connected to the overhead crane 200, and its bilaterally symmetrical structure provides a balanced connection point. The left hook of the chain hook 7 is used to connect to the left lifting chain, and the right hook is used to connect to the right lifting chain. The right lifting chain is used to connect to the diagonal bolt hole of the wheel hub of the right wheel of the test vehicle, and the left lifting chain is used to connect to the diagonal bolt hole of the wheel hub of the left wheel of the test vehicle.

[0037] The left and right lifting chains adopt the same lifting chain structure. The lifting chains are connected to the support frame through the chain hook 7. The length of the chain body 12 of the lifting chain is set according to actual needs. The connecting plate 9 of the wheel connecting assembly adopts a curved plate mechanism. The curvature of the curved plate is the same as the curvature of the wheel hub, so that the connecting plate 9 fits the outer side of the wheel hub to increase stability. At the same time, it is convenient to pass the fastening screws 10 through the connecting holes on the connecting plate 9 and connect with the diagonal bolt holes on the wheel hub. The bolt fixing sleeve 11 is used to fix the fastening screws 10 to increase the stability of the connection between the connecting plate 9 and the wheel hub of the test vehicle.

[0038] In some embodiments, the support frame includes a top plate 1, a bottom plate 2, a support plate 3 and a fixed plate 4 arranged in parallel. The top plate 1 and the bottom plate 2 are arranged in parallel. The support plate 3 is fixedly arranged between the top plate 1 and the bottom plate 2. The fixed plate 4 is arranged at both ends of the top plate 1 and the bottom plate 2. The inner side of the fixed plate 4 is fixedly connected to the top plate 1, the bottom plate 2 and the support plate 3, and the outer side of the fixed plate 4 is fixedly connected to the chain hook 7.

[0039] Specifically, the top plate 1 and bottom plate 2 of the support frame are arranged in parallel, the support plate 3 is arranged vertically between the top plate 1 and the bottom plate 2, and two fixing plates 4 are arranged at both ends of the support frame, and the two fixing plates 4 are fixedly connected to the two ends of the top plate 1, the bottom plate 2 and the support plate 3 respectively. The top plate 1, the bottom plate 2, the support plate 3 and the fixing plate 4 of the support frame are fixed by welding, or in other embodiments, an integrated molding process is adopted to increase the stability of the support frame. The chain hooks 7 are symmetrically arranged at both ends of the support frame, and the connection point between the chain hooks 7 and the support frame is set on the fixing plate 4. The support frame has a symmetrical structure as a whole, and a sling connecting buckle 13 is set at the midpoint of the top plate 1 of the support frame. The sling connecting buckle 13 is used to provide a sling connection point between the support frame and the overhead crane 200.

[0040] In some embodiments, the fixing plate 4 further includes a reinforcing plate 5 , which is fixedly disposed on the outer side of the fixing plate 4 , and the chain hook 7 is fixedly disposed on the reinforcing plate 5 .

[0041] Specifically, the reinforcing plate 5 is a reinforcement structure fixedly arranged on the fixing plate 4, and the chain hook 7 is connected to the fixing plate 4 through the reinforcing plate. The chain hook 7 and the reinforcing plate are fixed by welding.

[0042] In some embodiments, the left side hook includes a left front hook and a left rear hook, and the fixed plate 4 also includes a partition plate 6, which is vertically arranged on the outside of the fixed plate 4, and the left front hook and the left rear hook are respectively arranged on both sides of the partition plate 6.

[0043] Specifically, the right hook also includes a right front hook and a right rear hook, and the right hook and the left hook are symmetrically arranged. The fixing plate 4 includes a left fixing plate and a right fixing plate, and the partition plate 6 includes a left partition plate and a right partition plate. The left partition plate is fixedly arranged on the left fixing plate, and the right partition plate is fixedly arranged on the right partition plate. The left left lifting chain includes a left front lifting chain and a left rear lifting chain, and the right right lifting chain includes a right front lifting chain and a right rear lifting chain. The left front lifting chain is connected to the left front hook, the left rear lifting chain is connected to the left rear hook, the right front lifting chain is connected to the right front hook, and the right rear lifting chain is connected to the right rear hook. The left front lifting chain, the left rear lifting chain, the right front lifting chain, and the right rear lifting chain are used to connect the left front wheel, the left rear wheel, the right front wheel, and the right rear wheel of the test vehicle, respectively.

[0044] In some embodiments, the lifting chain also includes a connecting lifting ring 8, which includes a lifting ring body and a fixing piece. A lifting ring opening is provided at the bottom of the lifting ring body, and fixing holes for connecting the fixing piece are provided on both sides of the lifting ring opening. A connecting through hole corresponding to the fixing hole is provided on the connecting plate 9.

[0045] Specifically, connecting rings 8 are provided at both ends of the chain body 12. The connecting ring 8 at the top end of the chain body 12 is used to connect the chain body 12 and the chain hook 7, and the ring 8 at the bottom end of the chain body 12 is used to connect the chain body 12 and the connecting plate 9. The ring opening is used to connect the chain body 12 in series. When the ring 8 is connected to the connecting plate 9, the ring opening and the top end of the connecting plate 9 are snapped together, so that the fixing holes on both sides of the ring opening are connected to the connecting through-holes opened at the top end of the connecting plate 9, so that the fixing parts pass through the fixing holes on one side of the ring opening, the connecting through-holes of the connecting plate 9, and the fixing holes on the other side of the ring opening in sequence to achieve a fixed connection.

[0046] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand this document.

Claims

1. A vehicle positioning method for a pole impact test, characterized in that: include: Set the vehicle gear and parking brake, and remove the diagonal bolts on the tires; Connect the top of the spreader and the overhead crane, set a lifting chain at the bottom of the spreader, and fix the bolt holes of the vehicle through the lifting chain; Adjust the length of the lifting chain and the lifting angle to lift the vehicle to the preset height; Move the vehicle to the preset position by the overhead crane and rotate the vehicle to the preset angle; Secure the vehicle at the preset position and remove the connection between the lifting chain and the vehicle.

2. The method according to claim 1, characterized in that The lifting chain includes a chain body and a wheel connection assembly. The wheel connection assembly includes a connecting plate, a fastening screw and a bolt fixing sleeve. The top of the connecting plate is fixedly connected to the chain body. The connecting plate is provided with a connecting hole corresponding to the diagonal bolt of the tire. The fastening screw passes through the connecting hole and is fixedly connected to the bolt fixing sleeve.

3. The method according to claim 2, characterized in that The lifting chain also includes a connecting lifting ring, which includes a lifting ring body and a fixing piece. A lifting ring opening is provided at the bottom of the lifting ring body, and fixing holes for connecting the fixing piece are provided on both sides of the lifting ring opening.

4. The method according to claim 3, characterized in that The sling also includes a support frame and a chain hook. The support frame includes a top plate, a bottom plate, a support plate and a fixed plate arranged in parallel. The top plate and the bottom plate are arranged in parallel. The support plate is fixedly arranged between the top plate and the bottom plate. The fixed plate is arranged at both ends of the top plate and the bottom plate. The inner side of the fixed plate is fixedly connected to the top plate, the bottom plate and the support plate, and the outer side of the fixed plate is fixedly connected to the chain hook.

5. A vehicle positioning sling for a pole impact test, characterized in that: include: The support frame adopts a bilaterally symmetrical structure, and the top midpoint of the support frame is used to connect the overhead crane; The chain hook comprises a left hook and a right hook, and the left hook and the right hook are symmetrically arranged at both ends of the support frame; The lifting chain includes a symmetrically arranged left lifting chain and a right lifting chain. The lifting chain includes a chain body and a wheel connecting assembly. The top end of the chain body is connected to the chain hook, and the bottom end of the chain body is connected to the wheel connecting assembly. The wheel connecting assembly includes a connecting plate, a fastening screw and a bolt fixing sleeve. The top of the connecting plate is fixedly connected to the chain body. The connecting plate is provided with connecting holes corresponding to the diagonal bolts of the tire. The fastening screws pass through the connecting holes and are fixedly connected to the bolt fixing sleeve.

6. The sling according to claim 5, characterized in that: The support frame includes a top plate, a bottom plate, a support plate and a fixed plate arranged in parallel. The top plate and the bottom plate are arranged in parallel. The support plate is fixedly arranged between the top plate and the bottom plate. The fixed plate is arranged at both ends of the top plate and the bottom plate. The inner side of the fixed plate is fixedly connected to the top plate, the bottom plate and the support plate, and the outer side of the fixed plate is fixedly connected to the chain hook.

7. The spreader according to claim 6, characterized in that: The fixing plate also includes a reinforcing plate, which is fixedly arranged on the outer side of the fixing plate, and the chain hook is fixedly arranged on the reinforcing plate.

8. The spreader according to claim 7, characterized in that: The left side hook includes a left front hook and a left rear hook, and the fixing plate also includes a partition plate, which is vertically arranged on the outer side of the fixing plate, and the left front hook and the left rear hook are respectively arranged on both sides of the partition plate.

9. The spreader according to claim 8, characterized in that: The lifting chain also includes a connecting lifting ring, which includes a lifting ring body and a fixing piece. A lifting ring opening is provided at the bottom of the lifting ring body, and fixing holes for connecting the fixing piece are provided on both sides of the lifting ring opening. Connecting through holes corresponding to the fixing holes are provided on the connecting plate.

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