A traction system for heavy vehicle crash test

Abstract

The present invention discloses a traction system for a heavy-duty vehicle collision test, including a power assembly, a test track and a traction trolley; the power assembly is movably connected to the traction trolley through a traction rope, and the traction trolley pulls the vehicle to be tested to move on the test track; there is a set of power assembly and two groups of test tracks, and a traction trolley is arranged on each group of test tracks. The traction rope starts from the power assembly and passes through the two groups of test tracks in sequence and then returns to the power assembly to form a single-track and single-rope circular winding mode connected end to end. Beneficial effects: The present invention improves the test efficiency and the utilization rate of the equipment; the present invention eliminates the influence caused by the plastic deformation of the traction rope by respectively arranging mechanical tensioning devices at both ends of the test track, thereby improving the accuracy of the test data and the success rate of the test. The bearing box structure design improves the load-bearing capacity between the front and rear winch wheels, while reducing the difficulty of installation and commissioning of the equipment.

Description

Technical Field

[0001] The invention relates to a vehicle collision test device, in particular to a traction system for a heavy vehicle collision test, and belongs to the technical field of vehicle testing. Background Art

[0002] At present, there are dozens of real-car collision laboratories in China, with quite complete testing capabilities and technical levels, covering technical research from internal R&D of automobile enterprises, third-party testing and certification, and claims and loss assessment in the insurance industry, providing solid infrastructure support for improving the safety performance of Chinese car products. However, there is no collision test traction system for heavy-duty vehicles above 20 tons in China. Heavy-duty vehicle collision tests are mainly a series of regulatory tests conducted on highway protection facilities.

[0003] The test uses a traction system to tow a vehicle to collide with a protective facility at a certain speed, and uses several high-speed cameras pre-set in the collision zone to record the entire process of the vehicle entering and colliding, in order to detect the following main evaluation items of the protective facility: protective energy, blocking function, anti-intrusion performance, cushioning performance, guiding function and facility deformation process.

[0004] The heavy-duty vehicle collision traction system is an important technical infrastructure support system for highway safety infrastructure testing. The most important key units of the traction system are the winch powertrain and the hydraulic tensioning device of the traction rope. According to the highway guardrail safety performance evaluation standards, the traction speed and traction load of heavy-duty vehicles are much greater than the technical indicators of car traction. Therefore, the design indicators, mechanical structure schemes, manufacturing processes, installation and commissioning processes of the traction powertrain are very different from those of the car traction powertrain.

[0005] Since cars are lighter in weight, the acceleration distance required to accelerate from a standstill to the test speed is shorter, so the length of the traction track is usually about 100 meters. However, heavy vehicles are heavier and require a longer acceleration distance to accelerate from a standstill to the test speed. For example, a 20-ton vehicle requires a test track length of 400 meters within the towing rope and powertrain tolerance. A single set of test tracks also requires a towing rope to pass back and forth through the powertrain, and the collision test process for heavy vehicles is shorter, but the pre-preparation cycle is longer, ranging from a few days to more than ten days, and the investment cost of heavy vehicle collision test equipment is high. The problems that need to be solved for heavy vehicle collision tests are cost and efficiency issues.

[0006] In addition, the collision test of heavy vehicles also needs to consider the traction load and equipment installation height. Chinese patent CN105129686A discloses a traction and hydraulic tensioning device for automobile collision test, in which two sets of traction sheaves are respectively installed on the cast iron platform through two bearing seats, and the bearing seats and the cast iron platform are connected by positioning unloading keys. However, the traction load in the collision test of heavy vehicles is much greater than the traction index of cars. Therefore, the existing independent bearing seats cannot withstand the traction load in the collision test of heavy vehicles, which will cause the connection between the bearing seat and the cast iron platform to fail, and then cause the failure of the entire test system.

[0007] In order to meet the requirements of heavy-duty vehicle collision tests, the structural dimensions of the traction equipment will be larger than those of the car collision test equipment, the weight will be heavier, the total power success rate will be greater, and the traction rope will be longer, so on-site installation and debugging will be more difficult. Summary of the invention

[0008] Purpose of the invention: The purpose of the present invention is to provide a traction system for heavy vehicle collision test in view of the problems existing in the prior art. By improving the design of structural parameters such as the powertrain, bearing box and mounting platform, the requirements for traction load in heavy vehicle collision test are met, and the problem of difficult on-site installation and debugging of the equipment is solved.

[0009] Technical solution: A traction system for a heavy vehicle collision test, including a power assembly, a test track and a traction trolley; the power assembly is movably connected to the traction trolley through a traction rope, and the traction trolley pulls the vehicle to be tested to move on the test track; there is one power assembly and two groups of test tracks, and a traction trolley is arranged on each group of test tracks. The traction rope starts from the power assembly and passes through the two groups of test tracks in sequence and then returns to the power assembly to form a single-track and single-rope circular bypass method connected end to end.

[0010] In the present invention, the power assembly drives the traction trolley to run on the test track through the traction rope. The traction trolley pulls the vehicle to be tested on the test track to accelerate and run until the test. The traction trolley is separated from the traction rope, and the traction trolley and the vehicle to be tested enter the collision area together for the collision test. The present invention adopts a traction scheme in which a power assembly is equipped with two sets of test tracks with single ropes and single rails connected end to end and circling in a circular manner. The same round-trip traction rope can provide driving force for the two sets of test tracks respectively, which improves the utilization rate of the traction rope. A shared power assembly can realize the function of centralized control of separate traction. The two sets of test tracks are separately or simultaneously prepared for the collision test, which improves the test efficiency and the utilization rate of the equipment, thereby reducing the test cost.

[0011] Preferably, in order to eliminate the plastic deformation of the traction rope under high tension and avoid uncontrollable tensioning force, mechanical tensioning devices are respectively provided at both ends of the test track, and the traction rope passes through the mechanical tensioning device before entering and exiting the test track.

[0012] The present invention improves the accuracy of test data and the success rate of the test. The length of the traction rope for a heavy vehicle collision is much longer than that of the traction rope for a car collision traction system, and the tension of the traction rope is also much greater than that of a car traction. Under high tension, the traction rope will undergo plastic deformation, which will lead to an uncontrollable tension, resulting in inaccurate test data, and even serious test failure.

[0013] Preferably, in order to meet the requirements of traction load of heavy vehicles in collision tests, the power assembly includes a mounting platform, a drive motor, a front winch wheel, a rear winch wheel and a bearing box; the drive motor and the bearing box are respectively fixedly mounted on the mounting platform, the front winch wheel and the rear winch wheel are respectively and simultaneously rotatably mounted in the bearing box, and two sets of drive motors are respectively connected to the front winch wheel and the rear winch wheel. The dual winch wheel structure with dual drive motors can reduce the purchase cost of the drive motor, and can also reduce the overall weight and size of the power assembly; the integrated bearing box can offset the force between the front and rear winch wheels to form the internal force of the bearing box structure, avoiding the transmission of the traction load to the connection failure caused by the bearing seat and the mounting platform.

[0014] Optimum option: In order to meet the requirements of heavy-duty vehicle traction load in collision test and avoid excessive traction force causing the traction rope to slip, the front winch wheel is provided with 8 grooves, the rear winch wheel is provided with 7 grooves, and the traction rope is spirally interlaced in the grooves between the front winch wheel and the rear winch wheel in sequence. After design and calculation, a double winch wheel structure with an 8-groove front winch wheel and a 7-groove rear winch wheel is adopted, and the traction rope is spirally interlaced, which can meet the requirements of traction load of 20-60 tons heavy-duty vehicles without slipping.

[0015] Preferably, in order to facilitate the installation of the bearing box while meeting the strength requirements, the bearing box includes two sets of left-right symmetrical bearing box monomers, one bearing box monomer is provided with two parallel bearing mounting holes, the bearing box monomer includes a bearing box base and a bearing box upper seat, and the central axes of the two bearing mounting holes are simultaneously located on the interface between the bearing box base and the bearing box upper seat.

[0016] In order to meet the strength requirements, the volume and weight of the entire bearing box are large. Designing the bearing box into two sets of left-right symmetrical bearing box monomers can reduce the weight and facilitate the installation of the traction rope; each bearing box monomer is designed as an upper and lower split structure. First, the two bearing box bases are installed, and then the front winch wheel and the rear winch wheel are installed in the bearing mounting holes through bearings respectively. Finally, the bearing box base and the bearing box upper seat are fixed together. Only half the weight of the bearing box monomer needs to be lifted each time, which can further reduce the difficulty of installation.

[0017] Preferably, in order to accurately and reliably locate the distance between the two bearing box monomers, a limit shaft and an installation rod are provided between the two bearing box monomers, the limit shaft comprises a limit shaft body and installation shafts at both ends of the limit shaft body, the end faces on both sides of the limit shaft body are respectively in contact with the inner side faces of the two bearing box monomers, the installation shafts at both ends are respectively installed in the limit shaft holes of the two bearing box monomers, and the center axis of the limit shaft hole is located on the interface between the bearing box base and the bearing box upper seat; the installation rod passes through the left and right bearing box monomers respectively, and installation nuts are provided at both ends of the installation rod, and the installation nuts are connected to the ends of the installation rod extending out of the outside of the bearing box monomers; the bearing box base and the bearing box upper seat are respectively penetrated by installation rods and are symmetrically distributed on both sides of the limit shaft.

[0018] The limit shaft is connected to the bearing box monomers on both sides through the installation shaft. The diameter of the limit shaft body is larger than the diameter of the installation shaft. The end faces on both sides of the limit shaft body are respectively in contact with the inner side surfaces of the two bearing box monomers to limit the distance between the inner side surfaces. The installation shaft is located on the interface between the bearing box base and the bearing box upper seat, which is convenient for installation and debugging. Placing the limit shaft before the bearing box upper seat is closed can improve the efficiency of installation and debugging.

[0019] The installation rod passes through the bearing box monomers on both sides and tightens the bearing box monomers on both sides by installing nuts, which can improve the stability and reliability of the bearing box monomers on both sides maintaining the relative position; and the installation rods pass through the bearing box base and the bearing box upper seat respectively and are symmetrically distributed on both sides of the limit shaft, which can ensure that the inner side surfaces of the bearing box base and the bearing box upper seat are tightly fitted with the end faces on both sides of the limit shaft body, further improving the installation stability and reliability.

[0020] Preferably, in order to facilitate the installation and debugging of the drive motor and the bearing box, the upper surface of the installation platform is provided with a fastening connection groove, a center positioning groove and a lateral adjustment groove, and the bottom of the drive motor and the bearing box is provided with a T-shaped connection block, a center positioning block, a lateral adjustment device and a longitudinal adjustment device;

[0021] The center positioning block is installed at the bottom of the driving motor and the bearing box along the longitudinal direction, and the bottom of the center positioning block is inserted into the center positioning groove during installation;

[0022] The T-shaped connection block is installed in the fastening connection groove, and the drive motor and the bearing box are fixedly installed on the installation platform through the T-shaped connection block;

[0023] The lateral adjustment device is installed in the lateral adjustment slot, and a lateral adjustment bolt is provided on the top of the lateral adjustment device, and the adjustment bolt contacts the lateral side of the drive motor and the bearing box;

[0024] The longitudinal adjustment device is installed in the fastening connection groove, and a longitudinal adjustment bolt is provided on the top of the longitudinal adjustment device, and the longitudinal adjustment bolt is in contact with the longitudinal side surface of the driving motor and the bearing box;

[0025] The installation platform is provided with a horizontal adjustment screw hole, and the screw installed in the horizontal adjustment screw hole contacts the driving motor and the bottom of the bearing box.

[0026] Since the weight of the drive motor and the bearing box makes it difficult to move during the assembly process, the center positioning block and the center positioning groove can cooperate to achieve rapid longitudinal preliminary positioning during the assembly process, and the preliminary installation can be completed; the horizontality of the drive motor and the bearing box can be fine-tuned by horizontally adjusting the top screw in the top screw hole; the lateral and longitudinal position of the drive motor and the bearing box can be fine-tuned by the lateral adjustment device and the longitudinal adjustment device; finally, the precise connection between the drive motor and the front and rear winch wheels can be achieved.

[0027] Preferably, in order to adapt to the traction capacity of different working conditions, the tension of the traction rope needs to be controllably adjustable, and a hydraulic tensioning device is provided at the rear end of the power assembly, and the power assembly and the hydraulic tensioning device are connected by winding the traction rope;

[0028] The hydraulic tensioning device comprises a tensioning assembly mounting platform, a tensioning wheel assembly, a hydraulic tensioning guide rail and a hydraulic oil cylinder. The hydraulic tensioning guide rail is mounted on the tensioning assembly mounting platform. The hydraulic oil cylinder drives the tensioning wheel assembly to tighten the traction rope along the hydraulic tensioning guide rail.

[0029] The tension wheel assembly comprises a coaxial right tension wheel and a left tension wheel, and the traction rope passes through the rightmost groove of the front winch wheel, the rightmost groove of the rear winch wheel, the right tension wheel, the rightmost groove of the left side of the rear winch wheel, the second groove on the right side of the front winch wheel, the third groove on the right side of the rear winch wheel, the fourth groove on the right side of the front winch wheel, the leftmost groove of the rear winch wheel, the left tension wheel, the leftmost groove of the rear winch wheel, and finally exits the power assembly from the leftmost groove of the front winch wheel;

[0030] The groove of the right tension wheel is opposite to the rightmost groove of the rear winch wheel, and the groove of the left tension wheel is opposite to the leftmost groove of the rear winch wheel.

[0031] The present invention can provide accurate and stable tensioning force for the traction rope through the hydraulic cylinder, and the grooves of the left and right tensioning wheels are respectively opposite to the leftmost and rightmost grooves on the outermost side of the rear winch wheel. Regardless of the forward and reverse rotation of the driving motor, the tensioning force of the traction rope can be directly, effectively and accurately adjusted.

[0032] In order to provide the same or greater effective traction during forward and reverse rotation, the center axes of the right and left tension wheels are on the same horizontal plane as the center axis of the rear winch wheel, and the right and left tension wheels have the same diameter and are smaller than the diameter of the rear winch wheel groove.

[0033] The center axes of the right and left tension wheels are on the same horizontal plane as the center axis of the rear winch wheel and the right and left tension wheels have the same diameter, which can achieve the same tension force during forward and reverse rotation, thereby obtaining the same effective traction force, which is conducive to obtaining accurate comparative test data when conducting comparative tests on two test tracks. The diameters of the right and left tension wheels are smaller than the diameters of the grooves of the rear winch wheel, and the two outermost grooves of the rear winch wheel can form a larger wrap angle, thereby obtaining greater effective traction force.

[0034] Preferably, in order to withstand the reaction force of the extremely large traction rope tension on the guide rail mounting bracket, the bottom of the first and last ends of the hydraulic tensioning guide rail are respectively fixedly connected with the guide rail mounting bracket;

[0035] The tensioning assembly mounting platform includes a T-shaped mounting slot, a lower shear slot and a horizontal adjustment threaded hole; the bottom of the guide rail mounting bracket is provided with a T-shaped connecting block connection hole and an upper shear slot;

[0036] When the guide rail mounting bracket is connected to the mounting platform, a load-bearing key is provided between the upper shear groove and the lower shear groove, a T-shaped connecting block is provided between the T-shaped connecting block connecting hole and the T-shaped mounting groove, a horizontal top screw is provided in the horizontal adjustment threaded hole and is located at the bottom of the guide rail mounting bracket, and a longitudinal adjustment device is provided in the T-shaped mounting groove and is distributed on the left and right sides of the guide rail mounting bracket;

[0037] The cooperation between the load-bearing key and the upper shear groove and the lower shear groove bears the lateral shear force between the guide rail mounting bracket and the tensioning assembly mounting platform caused by the traction rope. The connection between the T-shaped mounting groove and the T-shaped connecting block realizes positioning. The horizontal top screw and the longitudinal adjustment device realize fine-tuning of the hydraulic tensioning device in the horizontal and longitudinal directions.

[0038] Two symmetrical long holes arranged in the vertical direction are arranged in the middle of the guide rail mounting bracket installed at the bottom of the front end of the hydraulic tensioning guide rail, and the two long holes are respectively opposite to the right tensioning wheel and the left tensioning wheel; the traction rope passing under the right tensioning wheel and the left tensioning wheel passes through the two long holes and is connected to the rear winch wheel;

[0039] The middle of the guide rail mounting brackets at the bottom of both ends of the hydraulic tensioning guide rail are both provided with mounting process holes.

[0040] The long hole can prevent the traction rope from becoming tangled or jumping when it is loose or tensioned, and the installation process hole is convenient for the traction rope to be installed, maintained, and observed.

[0041] Preferably, in order to constrain the position of the traction rope entering and exiting the power assembly and accurately measure the linear speed of the traction rope at the same time, a tachometer wheel assembly is provided at the front end of the power assembly, and the tachometer wheel assembly includes a right tachometer wheel, a left tachometer wheel and a tachometer wheel assembly bracket, and the tachometer wheel assembly bracket is installed at the front end of the bearing box, the right tachometer wheel is installed at the upper right corner of the tachometer wheel assembly bracket, and the left tachometer wheel is installed at the lower left corner of the tachometer wheel assembly bracket; the groove of the right tachometer wheel is opposite to the rightmost groove of the front winch wheel, and the groove of the left tachometer wheel is opposite to the leftmost groove of the front winch wheel, and the traction rope passes through the groove of the right tachometer wheel and the rightmost groove of the front winch wheel as well as the groove of the left tachometer wheel and the leftmost groove of the front winch wheel in an alternating manner up and down.

[0042] A set of speed measuring wheel assembly is installed on the front end face of the bearing box. The speed measuring wheel assembly can constrain the height and width of the traction rope at the entrance and exit of the front winch wheel, ensuring that the traction rope at the entrance and exit of the front winch wheel corresponds to a predetermined height, avoiding the rope tangling phenomenon at the entrance and exit, and measuring and feeding back the wheel speed by installing a speed measuring photoelectric encoder on the end face of the wheel axle to achieve closed-loop speed control.

[0043] Beneficial effects: The present invention adopts a set of power assembly equipped with two sets of test tracks with single ropes and single rails connected end to end in a circular traction scheme. The same reciprocating traction rope can provide driving force for the two sets of test tracks respectively, thereby improving the utilization rate of the traction rope. Sharing a set of power assembly can realize the function of centralized control of separate traction. The two sets of test tracks can carry out preliminary preparations for collision tests separately or simultaneously, thereby improving the test efficiency and the utilization rate of equipment, thereby reducing the test cost.

[0044] The present invention eliminates the influence caused by the plastic deformation of the traction rope by respectively arranging mechanical tensioning devices at both ends of the test track, thereby improving the accuracy of the test data and the test success rate.

[0045] The dual winch wheel structure with dual drive motors can reduce the purchase cost of the drive motor, and can also reduce the overall weight and size of the powertrain; the integrated bearing box can offset the force between the front and rear winch wheels to form a bearing box structure that withstands internal forces, thereby avoiding the transmission of traction loads to the bearing seat and the mounting platform, causing connection failure.

[0046] It adopts a double winch wheel structure with an 8-slot front winch wheel and a 7-slot rear winch wheel, and the traction rope is in a spiral staggered winding form, which can meet the traction load requirements of 20-60 tons heavy vehicles without slipping.

[0047] In order to meet the strength requirements, the volume and weight of the entire bearing box are large. Designing the bearing box into two sets of left-right symmetrical bearing box monomers can reduce the weight and facilitate the installation of the traction rope; each bearing box monomer is designed as an upper and lower split structure. First, the two bearing box bases are installed, and then the front winch wheel and the rear winch wheel are installed in the bearing mounting holes through bearings respectively. Finally, the bearing box base and the bearing box upper seat are fixed together. Only half the weight of the bearing box monomer needs to be lifted each time, which can further reduce the difficulty of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0049] Figure 1 It is a schematic diagram of the layout of the traction system of the present invention;

[0050] Figure 2 This is a schematic diagram of the traction rope circuit of the present invention;

[0051] Figure 3 It is a front view of the power assembly of the present invention;

[0052] Figure 4 A top view of the power assembly of the present invention;

[0053] Figure 5 It is a front view of the winding structure of the traction rope of the power assembly of the present invention;

[0054] Figure 6 A top view of the winding structure of the traction rope of the power assembly of the present invention;

[0055] Figure 7 A top view of the installation platform of the present invention;

[0056] Figure 8 It is a structural schematic diagram of a bearing box monomer of the present invention;

[0057] Fig. 9 It is a structural schematic diagram of the center positioning block of the present invention;

[0058] Fig.10 It is a structural schematic diagram of the longitudinal adjustment device of the present invention;

[0059] Fig.11 It is a structural schematic diagram of the limiting shaft of the present invention;

[0060] Fig.12 It is a structural schematic diagram of the hydraulic tensioning device of the present invention;

[0061] Fig.13 This is a schematic diagram of the structure of the tensioning assembly installation platform of the present invention;

[0062] Fig.14 A three-dimensional view of the guide rail mounting stand of the present invention;

[0063] Fig.15 This is a front view of the guide rail mounting stand of the present invention;

[0064] Fig.16 It is a schematic structural diagram of the tachometer wheel assembly of the present invention. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0068] like Figure 1 and 2As shown, a traction system for a heavy vehicle collision test includes a power assembly 1, a test track 2 and a traction trolley 3; the power assembly 1 is movably connected to the traction trolley 3 through a traction rope, and the traction trolley 3 pulls the vehicle to be tested to move on the test track 2; there is a set of power assembly 1 and two groups of test tracks 2, and a traction trolley 3 is arranged on each group of test tracks 2. The traction rope starts from the power assembly 1 and passes through the two groups of test tracks 2 in sequence and then returns to the power assembly 1 to form a single-track single-rope circular winding mode connected end to end.

[0069] In the present invention, the power assembly 1 drives the traction trolley 3 to run on the test track 2 through the traction rope. The traction trolley 3 pulls the vehicle to be tested on the test track 2 to accelerate and run until the test. The traction trolley 3 is separated from the traction rope, and the traction trolley 3 and the vehicle to be tested enter the collision area together for the collision test. The present invention adopts a traction scheme in which a power assembly 1 is equipped with two groups of test tracks 2 with single ropes and single rails connected end to end and circling in a circular manner. The same round-trip traction rope can provide driving force for the two groups of test tracks 2 respectively, thereby improving the utilization rate of the traction rope. The shared power assembly 1 can realize the function of centralized control of separate traction. The two groups of test tracks 2 are separately or simultaneously prepared for the collision test, thereby improving the test efficiency and the utilization rate of the equipment, thereby reducing the test cost.

[0070] In order to eliminate the plastic deformation of the traction rope under high tension and avoid uncontrollable tensioning force, mechanical tensioning devices 4 are respectively provided at both ends of the test track 2, and the traction rope passes through the mechanical tensioning device 4 before entering and exiting the test track 2.

[0071] The present invention improves the accuracy of test data and the success rate of the test. The length of the traction rope for a heavy vehicle collision is much longer than that of the traction rope for a car collision traction system, and the tension of the traction rope is also much greater than that of a car traction. Under high tension, the traction rope will undergo plastic deformation, which will lead to an uncontrollable tension, resulting in inaccurate test data, and even serious test failure.

[0072] like Figure 3 and 4 As shown, the power assembly 1 includes a mounting platform 11, a drive motor 12, a front winch wheel 13, a rear winch wheel 14 and a bearing box 15; the drive motor 12 and the bearing box 15 are respectively fixedly mounted on the mounting platform 11, and the front winch wheel 13 and the rear winch wheel 14 are respectively and simultaneously rotatably mounted in the bearing box 15, and two sets of drive motors 12 are respectively driven and connected to the front winch wheel 13 and the rear winch wheel 14.

[0073] The dual winch wheel structure with dual drive motors 12 can reduce the purchase cost of the drive motors, and can also reduce the overall weight and size of the power assembly 1; the integrated bearing box 15 can offset the force between the front and rear winch wheels to form the structure of the bearing box 15 to bear internal forces, thereby avoiding the traction load from being transmitted to the bearing seat 15 and the mounting platform 11, causing connection failure.

[0074] like Figure 5 and 6 In order to meet the requirements of the traction load of heavy vehicles in the collision test and avoid the slipping of the traction rope due to excessive traction, the front winch wheel 13 is provided with 8 grooves, and the rear winch wheel 14 is provided with 7 grooves. The traction rope is spirally interlaced in the grooves between the front winch wheel 13 and the rear winch wheel 14. After design and calculation, a double winch wheel structure with an 8-groove front winch wheel 13 and a 7-groove rear winch wheel 14 is adopted, and the traction rope is spirally interlaced, which can meet the requirements of the traction load of 20-60 tons heavy vehicles without slipping.

[0075] Calculation instructions for winch wrap angle:

[0076] Under the action of a specific traction rope tension, in order to increase the traction friction, the traction system power assembly uses two sets of winch hubs to achieve traction rope winch traction. The maximum effective traction force calculation method is as follows:

[0077]

[0078] in:

[0079] F0—initial tension of the traction rope controlled by the hydraulic tensioning assembly;

[0080] μ—friction coefficient between traction rope and wheel hub;

[0081] α—the contact angle between the traction rope and the wheel hub;

[0082] —Euler coefficients.

[0083] According to the formula, under the action of a specific tension force F0, the maximum effective traction force F emax As α increases, the Euler coefficient approaches 1. Theoretically, when α = ∞, the maximum effective traction F emax =2F0, but excessive pursuit of maximum effective traction will lead to an oversized axial dimension of the hub. Assuming μ = 0.1, when α = 11π (i.e., the traction rope contacts the hub for 5.5 turns), the Euler coefficient can reach 0.9. According to the double-hub traction rope winding scheme, when the front winch wheel 13 is provided with 8 grooves (effective contact between the rope wheels for 6 and a half turns) and the rear winch wheel 14 is provided with 7 grooves (effective contact between the rope wheels for 5 and a half turns), the total contact angle between the traction rope and the hub is α = 11π.

[0084] like Figure 5 , 6 As shown in 12, in order to adapt to the traction capacity of different working conditions, the tension of the traction rope needs to be controllably adjustable, and a hydraulic tensioning device 5 is provided at the rear end of the power assembly 1, and the power assembly 1 and the hydraulic tensioning device 5 are connected by winding a traction rope;

[0085] The hydraulic tensioning device 5 includes a tensioning assembly mounting platform 51, a tensioning wheel assembly 52, a hydraulic tensioning guide rail 53 and a hydraulic oil cylinder 54. The hydraulic tensioning guide rail 53 is mounted on the tensioning assembly mounting platform 51. The hydraulic oil cylinder 54 drives the tensioning wheel assembly 52 to tighten the traction rope along the hydraulic tensioning guide rail 53.

[0086] The tension wheel assembly 52 includes a coaxial right tension wheel 521 and a left tension wheel 522, and the traction rope passes through the rightmost groove of the front winch wheel 13, the rightmost groove of the rear winch wheel 14, the right tension wheel 521, the rightmost groove of the left side of the rear winch wheel 14, the second groove on the right side of the front winch wheel 13, the third groove on the right side of the rear winch wheel 14, the fourth groove on the right side of the front winch wheel 13, until the leftmost groove of the rear winch wheel 14, the left tension wheel 522, the leftmost groove of the rear winch wheel 14, and finally exits the power assembly 1 from the leftmost groove of the front winch wheel 13;

[0087] The groove of the right tension wheel 521 is opposite to the rightmost groove of the rear winch wheel 14 , and the groove of the left tension wheel 522 is opposite to the leftmost groove of the rear winch wheel 14 .

[0088] The present invention can provide accurate and stable tensioning force for the traction rope through the hydraulic cylinder 54, and the grooves of the left and right tensioning wheels are respectively opposite to the leftmost and rightmost grooves on the outermost side of the rear winch wheel 14. Regardless of the forward and reverse rotation of the drive motor 12, the tensioning force of the traction rope can be directly, effectively and accurately adjusted.

[0089] In order to provide the same or greater effective traction force during forward and reverse rotation, the center axes of the right tension wheel 521 and the left tension wheel 522 are on the same horizontal plane as the center axis of the rear winch wheel 14, and the right tension wheel 521 and the left tension wheel 522 have the same diameter and are smaller than the diameter of the groove of the rear winch wheel 14.

[0090] The central axes of the right tension wheel 521 and the left tension wheel 522 are on the same horizontal plane as the central axis of the rear winch wheel 14 and the right tension wheel 521 and the left tension wheel 522 have the same diameter, which can achieve the same tensioning force during forward and reverse rotation, thereby obtaining the same effective traction force, which is conducive to obtaining accurate comparative test data when performing comparative tests on two test tracks 2. The diameters of the right tension wheel 521 and the left tension wheel 522 are smaller than the diameter of the groove of the rear winch wheel 14, and the two outermost grooves of the rear winch wheel 14 can form a larger wrap angle, thereby obtaining a greater effective traction force.

[0091] like Figure 8 As shown, in order to facilitate the installation of the bearing box 15 while meeting the strength requirements, the bearing box 15 includes two sets of left-right symmetrical bearing box monomers, one bearing box monomer is provided with two parallel bearing mounting holes 151, the bearing box monomer includes a bearing box base 152 and a bearing box upper seat 153, and the central axes of the two bearing mounting holes 153 are simultaneously located on the interface between the bearing box base 152 and the bearing box upper seat 153.

[0092] In order to meet the strength requirements, the entire bearing box 15 is large in size and weight. Designing the bearing box 15 into two sets of left-right symmetrical bearing box monomers can reduce the weight and facilitate the installation of the traction rope; each bearing box monomer is designed to be an upper and lower split structure. First, the two bearing box bases 152 are installed, and then the front winch wheel 13 and the rear winch wheel 14 are respectively installed in the bearing mounting holes through bearings. Finally, the bearing box base 152 and the bearing box upper seat 153 are fixedly connected together. Only half the weight of the bearing box monomer needs to be lifted each time, which can further reduce the difficulty of installation.

[0093] like Figure 4 and 11 As shown, in order to accurately and reliably locate the distance between the two bearing box monomers, a limiting shaft 154 and an installation rod 155 are provided between the two bearing box monomers, the limiting shaft 154 includes a limiting shaft body 1541 and installation shafts 1542 at both ends of the limiting shaft body 1541, the end faces on both sides of the limiting shaft body 1541 are respectively in contact with the inner side faces of the two bearing box monomers, the installation shafts 1542 at both ends are respectively installed in the limiting shaft holes 1543 of the two bearing box monomers, and the center axis of the limiting shaft hole 1543 is located on the interface between the bearing box base 152 and the bearing box upper seat 153; the installation rod 155 passes through the left and right bearing box monomers respectively, and installation nuts 156 are provided at both ends of the installation rod 155, and the installation nuts 156 are connected to the ends of the installation rod 155 extending out of the outside of the bearing box monomers; the bearing box base 152 and the bearing box upper seat 153 are respectively penetrated and installed with installation rods 155 and are symmetrically distributed on both sides of the limiting shaft 154.

[0094] The limiting shaft 154 is connected to the bearing box monomers on both sides through the installation shaft 1542. The diameter of the limiting shaft body 1541 is larger than the diameter of the installation shaft 1542. The end faces on both sides of the limiting shaft body 1541 are respectively in contact with the inner side surfaces of the two bearing box monomers to limit the distance between the inner side surfaces; the installation shaft 1542 is located on the interface between the bearing box base 152 and the bearing box upper seat 153, which can facilitate installation and debugging. Placing the limiting shaft 1542 before the bearing box upper seat 153 is closed can improve the efficiency of installation and debugging.

[0095] The installation rod 155 passes through the bearing box monomers on both sides and is tightened by the installation nut 156, which can improve the stability and reliability of the bearing box monomers on both sides to maintain the relative position; and the installation rod 155 passes through the bearing box base 152 and the bearing box upper seat 153 respectively and is symmetrically distributed on both sides of the limiting shaft 154, which can ensure that the inner side surfaces of the bearing box base 152 and the bearing box upper seat 153 are tightly fitted with the end surfaces on both sides of the limiting shaft body 1541, further improving the installation stability and reliability.

[0096] like Figure 4 , 7 , 9 and 10, in order to facilitate the installation and commissioning of the drive motor 12 and the bearing box 15, the upper surface of the installation platform 11 is provided with a fastening connection groove 111, a center positioning groove 112 and a lateral adjustment groove 113, and the bottom of the drive motor 12 and the bearing box 15 is provided with a T-shaped connection block 16, a center positioning block 17, a lateral adjustment device 18 and a longitudinal adjustment device 19;

[0097] The center positioning block 17 is installed at the bottom of the driving motor 12 and the bearing box 15 along the longitudinal direction, and the bottom of the center positioning block 17 is inserted into the center positioning groove 112 during installation;

[0098] The bottom of the center positioning block 17 is provided with an installation guide cone surface and an installation threaded hole. The center positioning block 17 is connected to the bottom of the driving motor 12 and the bearing box 15 through the installation threaded hole, and is connected to the center positioning groove 112 on the upper surface of the installation platform 11 through the installation guide cone surface, which can improve the installation efficiency and facilitate alignment, and facilitate the rapid alignment of the two bearing box monomers in the longitudinal direction.

[0099] The T-shaped connection block 16 is installed in the fastening connection groove 111, and the drive motor 12 and the bearing box 15 are fixedly installed on the installation platform 11 through the T-shaped connection block 16;

[0100] The lateral adjustment device 18 is installed in the lateral adjustment slot 113, and a lateral adjustment bolt is provided on the top of the lateral adjustment device 18, and the adjustment bolt contacts the lateral side of the drive motor 12 and the bearing box 15;

[0101] The longitudinal adjustment device 19 is installed in the fastening connection groove 111, and a longitudinal adjustment bolt is provided on the top of the longitudinal adjustment device 19, and the longitudinal adjustment bolt is in contact with the longitudinal side surface of the drive motor 12 and the bearing box 15;

[0102] The bottom of the transverse adjustment device 18 and the longitudinal adjustment device 19 adopt a T-block structure, and are respectively provided with a locking top screw and an adjusting top screw. The locking top screw is fixed in the transverse adjustment groove 113 and the fastening connection groove 111 by tightening the top screw. The drive motor 12 and the bearing box 15 can be fine-tuned in the transverse and longitudinal directions by adjusting the top screw.

[0103] The installation platform 11 is provided with a horizontal adjustment screw hole 114 , and the screw installed in the horizontal adjustment screw hole 114 contacts the bottom of the driving motor 12 and the bearing box 15 .

[0104] Since the weight of the drive motor 12 and the bearing box 15 makes it difficult to move during the assembly process, the center positioning block 17 and the center positioning groove 112 can be used to achieve rapid longitudinal preliminary positioning during the assembly process, and the preliminary installation can be completed; the horizontality of the drive motor 12 and the bearing box 15 can be fine-tuned by horizontally adjusting the top screw in the top screw hole 114; the horizontal and vertical positions of the drive motor 12 and the bearing box 15 can be fine-tuned by the lateral adjustment device 18 and the longitudinal adjustment device 19; finally, the precise connection between the drive motor 12 and the front and rear winch wheels is achieved.

[0105] The tensioning assembly mounting platform 51 of the hydraulic tensioning device 5 also adopts the same mounting platform and adjusting device, which facilitates the installation and adjustment of the hydraulic tensioning device 5 .

[0106] like Figure 3 , 13 As shown in , 14 and 15, the tension assembly mounting platform 51 is made of cast iron blank by machining, and by splicing with the mounting platform 11 of the power assembly 1, the positioning and alignment between the power assembly 1 and the hydraulic tensioning device 5 can be accurately achieved. In order to withstand the reaction force of the extremely large traction rope tension on the guide rail mounting bracket 55, the guide rail mounting bracket 55 withstands the lateral shear force between the guide rail mounting bracket 55 and the tension assembly mounting platform 51 caused by the traction rope through the cooperation of the bearing key 56 with the upper shear groove 552 and the lower shear groove 512;

[0107] In order to facilitate the restraint, fixation, fine-tuning and alignment, and reaction force transmission of the hydraulic tensioning device 5, the tensioning assembly mounting platform 51 is provided with four T-shaped mounting grooves 511 and two lower shear grooves 512; the T-shaped mounting grooves 511 are used for fastening connection with the guide rail mounting bracket 55;

[0108] The bottom of the hydraulic tensioning guide rail 53 at both ends are respectively fixedly connected with a guide rail mounting bracket 55; the tensioning assembly mounting platform 51 includes a T-shaped mounting groove 511, a lower shear groove 512 and a horizontal adjustment threaded hole 513; a T-shaped connecting block connecting hole 551 and an upper shear groove 552 are provided at the bottom of the guide rail mounting bracket 55; when the guide rail mounting bracket 55 is connected to the mounting platform 51, a bearing key 56 is provided between the upper shear groove 552 and the lower shear groove 512, a T-shaped connecting block 16 is provided between the T-shaped connecting block connecting hole 551 and the T-shaped mounting groove 511, a horizontal top screw is provided in the horizontal adjustment threaded hole 513 and is located at the bottom of the guide rail mounting bracket 55, and a longitudinal adjustment device 19 is provided in the T-shaped mounting groove 511 and is distributed on the left and right sides of the guide rail mounting bracket 55;

[0109] The tension assembly mounting platform 51 and the guide rail mounting bracket 55 are connected through the upper shear groove 552 and the lower shear groove 512 and the bearing key 56 to transmit the tension of the traction rope. In addition, the bearing key 56 cooperates with the upper shear groove 552 and the lower shear groove 512 to realize the precise positioning of the two guide rail mounting brackets 55, ensuring the alignment of the bolt connection between the cast iron guide rail and the guide rail mounting bracket 55. In order to facilitate the fixing, leveling, equipment installation, lifting and transportation of the platform, the platform is provided with three types of holes, which are used as the platform fixing anchor bolt holes, the horizontal adjustment threaded holes 513, and the eyebolt threaded holes.

[0110] The hydraulic tensioning device 5 is provided with two welded guide rail mounting brackets 55 for supporting the hydraulic tensioning guide rail 53. The guide rail mounting bracket 55 is assembled and welded by a bottom plate, a longitudinal rib plate, a transverse rib plate, and a panel. After assembly welding, the bottom surface and the upper surface are milled, and a shear groove is milled on the bottom surface, which is connected to the tensioning assembly mounting platform 51 by means of a bearing key 56 to transmit the tension of the traction rope. Bolt holes are drilled on the bottom plate and the panel of the guide rail mounting bracket 55, and the longitudinal processing positioning of the hole system uses the shear groove as a unified reference, and the transverse processing positioning of the hole system uses the symmetric center line as a unified reference.

[0111] The guide rail mounting bracket 55 installed at the bottom of the front end of the hydraulic tensioning guide rail 53 is provided with two symmetrical long holes 553 arranged in the vertical direction in the middle, and the two long holes 553 are respectively opposite to the right tensioning wheel 521 and the left tensioning wheel 522; the traction rope passing under the right tensioning wheel 521 and the left tensioning wheel 522 passes through the two long holes 553 and is connected to the rear winch wheel 14; the guide rail mounting bracket 55 at the bottom of both ends of the hydraulic tensioning guide rail 53 is provided with installation process holes 554 in the middle. The long holes 553 can prevent the traction rope from being tangled and jumping when it is relaxed and tensioned, and the installation process holes 554 are convenient for the installation, maintenance and observation of the traction rope.

[0112] like Figure 5 , 6 As shown in Figures 16 and 17, in order to constrain the position of the traction rope entering and exiting the power assembly 1 and accurately measure the linear speed of the traction rope, a tachometer wheel assembly 6 is provided at the front end of the power assembly 1. The tachometer wheel assembly 6 includes a right tachometer wheel 61, a left tachometer wheel 62 and a tachometer wheel assembly bracket 63. The tachometer wheel assembly bracket 63 is installed at the front end of the bearing box 15.

[0113] The right speed measuring wheel 61 is installed at the upper right corner of the speed measuring wheel assembly bracket 63, and the left speed measuring wheel 62 is installed at the lower left corner of the speed measuring wheel assembly bracket 63;

[0114] The groove of the right tachometer wheel 61 is opposite to the rightmost groove of the front winch wheel 13, and the groove of the left tachometer wheel 62 is opposite to the leftmost groove of the front winch wheel 13. The traction rope passes through the groove of the right tachometer wheel 61 and the rightmost groove of the front winch wheel 13 as well as the groove of the left tachometer wheel 62 and the leftmost groove of the front winch wheel 13 in an alternating manner up and down.

[0115] A set of speed measuring wheel assembly 6 is installed on the front end face of the bearing box 15. The speed measuring wheel assembly 6 can constrain the height and width of the traction rope at the entrance and exit of the front winch wheel 13, ensuring that the traction rope at the entrance and exit of the front winch wheel corresponds to a predetermined height, avoiding the rope tangling phenomenon at the entrance and exit, and measuring and feeding back the wheel speed by installing a speed measuring photoelectric encoder on the end face of the wheel axle to achieve closed-loop speed control.

[0116] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0117] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A traction system for a heavy vehicle collision test, comprising a power assembly (1), a test track (2) and a traction trolley (3); the power assembly (1) is movably connected to the traction trolley (3) via a traction rope, and the traction trolley (3) tows the vehicle to be tested to move on the test track (2); the characteristics are: One powertrain (1) is equipped with two test tracks (2). A traction trolley (3) is provided on each set of test tracks (2), and the traction rope starts from the power assembly (1) and passes through the two sets of test tracks (2) in sequence and then returns to the power assembly (1), forming a single-track single-rope circular winding mode with the ends connected. The same reciprocating traction rope provides driving force for the two groups of test tracks (2) respectively, and a common power assembly (1) is used to realize the function of centralized control of separate traction. The two groups of test tracks (2) perform preliminary preparations for the collision test separately or simultaneously; The power assembly (1) comprises a mounting platform (11), a drive motor (12), a front hoisting wheel (13), a rear hoisting wheel (14) and a bearing box (15); the front hoisting wheel (13) and the rear hoisting wheel (14) are respectively and simultaneously rotatably mounted in the bearing box (15), and two sets of drive motors (12) are respectively connected to the front hoisting wheel (13) and the rear hoisting wheel (14) in a driving manner; The bearing box (15) comprises two sets of left-right symmetrical bearing box monomers, one bearing box monomer is provided with two parallel bearing mounting holes (151), the bearing box monomer comprises a bearing box base (152) and a bearing box upper seat (153), and the central axes of the two bearing mounting holes (151) are simultaneously located on the interface between the bearing box base (152) and the bearing box upper seat (153); A limiting shaft (154) and an installation rod (155) are provided between the two bearing box monomers. The limiting shaft (154) comprises a limiting shaft body (1541) and installation shafts (1542) at both ends of the limiting shaft body (1541). The end surfaces on both sides of the limiting shaft body (1541) are respectively in contact with the inner side surfaces of the two bearing box monomers. The installation shafts (1542) at both ends are respectively installed in the limiting shaft holes (1543) of the two bearing box monomers. The central axis of the limiting shaft hole (1543) is located at the bearing box base ( The mounting rod (155) is respectively passed through the left and right bearing box monomers, and mounting nuts (156) are provided at both ends of the mounting rod (155), and the mounting nuts (156) are connected to the ends of the mounting rod (155) extending out of the outer side of the bearing box monomer; the bearing box base (152) and the bearing box upper seat (153) are respectively passed through and installed with the mounting rod (155), and the mounting rods (155) are symmetrically distributed on both sides of the limit shaft (154) in the front and rear.

2. The traction system for heavy vehicle collision test according to claim 1, characterized in that: Mechanical tensioning devices (4) are respectively provided at both ends of the test track (2), and the traction rope passes through the mechanical tensioning devices (4) before entering and exiting the test track (2).

3. The traction system for heavy vehicle collision test according to claim 1, characterized in that: The driving motor (12) and the bearing box (15) are respectively fixedly mounted on the mounting platform (11).

4. The traction system for heavy vehicle collision test according to claim 3, characterized in that: The front winch wheel (13) is provided with 8 grooves, and the rear winch wheel (14) is provided with 7 grooves, and the traction rope is spirally interlaced and wound in the grooves between the front winch wheel (13) and the rear winch wheel (14) in sequence.

5. The traction system for heavy vehicle collision test according to claim 1, characterized in that: The upper surface of the mounting platform (11) is provided with a fastening connection groove (111), a center positioning groove (112) and a transverse adjustment groove (113); the bottom of the driving motor (12) and the bearing box (15) is provided with a T-shaped connection block (16), a center positioning block (17), a transverse adjustment device (18) and a longitudinal adjustment device (19); The center positioning block (17) is installed on the bottom of the driving motor (12) and the bearing box (15) along the longitudinal direction, and during installation, the bottom of the center positioning block (17) is inserted into the center positioning groove (112); The T-shaped connection block (16) is installed in the fastening connection groove (111), and the drive motor (12) and the bearing box (15) are fixedly installed on the installation platform (11) through the T-shaped connection block (16); The lateral adjustment device (18) is installed in the lateral adjustment groove (113), and a lateral adjustment bolt is provided on the top of the lateral adjustment device (18), and the adjustment bolt is in contact with the lateral side surface of the drive motor (12) and the lateral side surface of the bearing box (15) respectively; The longitudinal adjustment device (19) is installed in the fastening connection groove (111), and a longitudinal adjustment bolt is provided on the top of the longitudinal adjustment device (19), and the longitudinal adjustment bolt is respectively in contact with the longitudinal side surface of the drive motor (12) and the longitudinal side surface of the bearing box (15); The installation platform (11) is provided with a horizontal adjustment screw hole (114), and the screw installed in the horizontal adjustment screw hole (114) contacts the bottom of the drive motor (12) and the bottom of the bearing box (15) respectively.

6. The traction system for heavy vehicle collision test according to claim 4, characterized in that: A hydraulic tensioning device (5) is provided at the rear end of the power assembly (1), and the power assembly (1) and the hydraulic tensioning device (5) are connected by a traction rope. The hydraulic tensioning device (5) comprises a tensioning assembly mounting platform (51), a tensioning wheel assembly (52), a hydraulic tensioning guide rail (53) and a hydraulic oil cylinder (54); the hydraulic tensioning guide rail (53) is mounted on the tensioning assembly mounting platform (51); and the hydraulic oil cylinder (54) drives the tensioning wheel assembly (52) along the hydraulic tensioning guide rail (53) to tension the traction rope; The tension wheel assembly (52) comprises a coaxial right tension wheel (521) and a left tension wheel (522), and the traction rope passes through the rightmost groove of the front winch wheel (13), the rightmost groove of the rear winch wheel (14), the right tension wheel (521), the rightmost groove on the left side of the rear winch wheel (14), the second groove on the right side of the front winch wheel (13), the third groove on the right side of the rear winch wheel (14), the fourth groove on the right side of the front winch wheel (13), the leftmost groove of the rear winch wheel (14), the left tension wheel (522), the leftmost groove of the rear winch wheel (14), and finally exits the power assembly (1) from the leftmost groove of the front winch wheel (13); The groove of the right tension wheel (521) is opposite to the rightmost groove of the rear winch wheel (14), and the groove of the left tension wheel (522) is opposite to the leftmost groove of the rear winch wheel (14).

7. The traction system for heavy vehicle collision test according to claim 6, characterized in that: The central axes of the right tension wheel (521) and the left tension wheel (522) are on the same horizontal plane as the central axis of the rear winch wheel (14); the right tension wheel (521) and the left tension wheel (522) have the same diameter and are smaller than the diameter of the groove of the rear winch wheel (14).

8. The traction system for heavy vehicle collision test according to claim 4, characterized in that: A tachometer wheel assembly (6) is provided at the front end of the power assembly (1), the tachometer wheel assembly (6) comprising a right tachometer wheel (61), a left tachometer wheel (62) and a tachometer wheel assembly bracket (63), the tachometer wheel assembly bracket (63) being mounted at the front end of the bearing box (15). The right tachometer wheel (61) is mounted on the upper right corner of the tachometer wheel assembly bracket (63), and the left tachometer wheel (62) is mounted on the lower left corner of the tachometer wheel assembly bracket (63); The groove of the right speed measuring wheel (61) is opposite to the rightmost groove of the front winch wheel (13), and the groove of the left speed measuring wheel (62) is opposite to the leftmost groove of the front winch wheel (13). The traction rope passes through the groove of the right speed measuring wheel (61) and the rightmost groove of the front winch wheel (13) and the groove of the left speed measuring wheel (62) and the leftmost groove of the front winch wheel (13) in an alternating manner.

Images