Inspection bench for new energy passenger vehicle chassis

Abstract

The utility model belongs to the technical field of motor vehicle safety performance detection, and discloses an inspection bench for a new energy passenger vehicle chassis, which comprises a rack, a rear dynamometer, a bench-type hydraulic lifting device and a front dynamometer are sequentially mounted on the rack, the front dynamometer is mounted on the rack in a front-back sliding manner through a servo transmission device, and the bench-type hydraulic lifting device is mounted on the rack. The front end and the rear end of the front dynamometer are respectively connected with a front guide table and a rear guide table, the table type hydraulic lifting device comprises two lifting table groups which are arranged left and right, each lifting table group comprises a plurality of lifting tables which are sequentially arranged from back to front, and each lifting table is provided with a lifting control device; according to the utility model, a table-type hydraulic lifting structure is adopted to realize the position movement of the dynamometer, the support reliability of the test bench for the new energy passenger vehicle is ensured, the large-range axle distance adjustment requirement is met, one machine has multiple purposes, the cost investment of line expansion of the detection mechanism is reduced, and the test bench is suitable for popularization and application. And popularization of new energy vehicle electrical safety detection is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor vehicle safety performance detection technical field especially a kind of inspection bench for new energy passenger vehicle chassis. BACKGROUND

[0002] New energy passenger vehicle chassis dynamometer is a test device for measuring the performance of new energy passenger vehicles. New energy passenger vehicles have characteristics such as multi-motor independent drive and constant speed operation, which determine that all four wheels need to be detected at the same speed on the detection table body during new energy passenger vehicle detection.

[0003] Currently, the structures for adjusting the detection distance between the two dynamometers are mainly chain plate structures and cover plate overlapping structures, each with defects. The chain plate structure needs a large number of chain plates and transmission mechanisms to achieve the purpose of adjusting the detection distance, which not only has a very complex structure, but also has a very high cost of the entire chain plate structure, resulting in a huge cost investment for the expansion of the detection mechanism, which directly affects the implementation progress of the electrical safety detection of new energy passenger vehicles. Although the cover plate overlapping structure has a simple overall structure and a relatively low cost, the range of distance adjustment is greatly limited due to the setting of the middle overlapping cover plate, and it can only be applied to vehicles with an axle distance ranging from 2200mm to 3800mm. However, there are already many new energy passenger vehicles with an axle distance exceeding 3800mm or less than 2200mm, which cannot meet the detection needs of new energy passenger vehicles. SUMMARY

[0004] The main technical problem to be solved by the utility model is to provide an inspection bench for new energy passenger vehicle chassis, which uses a table type hydraulic lifting structure to realize the position movement of the dynamometer, ensures the reliability of the test bench in supporting new energy passenger vehicles, meets the wide-range axle distance adjustment needs, and can realize one machine with multiple uses, reduces the cost investment for the expansion of the detection mechanism, and is conducive to the promotion of electrical safety detection of new energy vehicles.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] An inspection bench for new energy passenger vehicle chassis includes a rack, the rack is sequentially installed with a rear dynamometer, a table type hydraulic lifting device and a front dynamometer, the front dynamometer is slidably installed on the rack through a servo transmission device, the front and rear ends of the front dynamometer are respectively connected with a front guide table and a rear guide table, the table type hydraulic lifting device includes two lifting table groups arranged left and right, each lifting table group includes a plurality of lifting tables arranged sequentially from rear to front, and each lifting table is provided with a lifting control device.

[0007] The following is a further optimization of the technical scheme by the utility model:

[0008] The two ends of the top of the frame are respectively fixed with a rear frame and a front frame, the rear frame and the front frame are jointly fixed with an intermediate cover plate, the rear dynamometer is fixed on the rear frame, the intermediate cover plate is arranged between the two lifting platform groups, the front dynamometer is fixedly installed on a sliding frame, and the sliding frame is slidably installed on the frame in the front-rear direction.

[0009] Further optimization: the servo drive device comprises a servo motor fixedly installed on the frame, a transmission screw rod rotatably installed on the frame, the transmission screw rod extending along the sliding direction of the sliding frame, the transmission screw rod being fixedly connected with the motor shaft of the servo motor, and a nut seat threadedly installed on the transmission screw rod and fixedly connected with the sliding frame.

[0010] Further optimization: the front end of the front guide table and the rear end of the rear guide table are both installed with a rotating link wheel.

[0011] Further optimization: the lifting platform comprises a bottom frame and a support table surface arranged in parallel, a scissor type support assembly is jointly installed between the support table surface and the bottom frame, one end of the lower end of the scissor type support assembly is rotatably installed on one end of the bottom frame through a hinge shaft, a hydraulic oil cylinder is jointly hingedly installed between the hinge shaft and the upper end of the scissor type support assembly, and the other end of the lower end of the scissor type support assembly is slidably installed on the other end of the bottom frame.

[0012] Further optimization: the lifting control device comprises an initial height signal switch, a limiting height signal switch and a locking assembly for locking the sliding end of the scissor type support assembly, the initial height signal switch is arranged in the middle of the end of the bottom frame which is not provided with the hinge shaft, and the limiting height signal switch and the locking assembly are both arranged on the rear side of the sliding end of the scissor type support assembly.

[0013] Further optimization: the locking assembly comprises a limiting rod, one end of the limiting rod away from the sliding end of the scissor type support assembly is hingedly installed on the bottom frame, a double-acting cylinder is jointly fixed between the other end of the limiting rod and the bottom frame, an upper locking rack is fixed on the free end of the limiting rod, a locking seat is fixed on the sliding end of the scissor type support assembly, a lower locking rack is fixed on the locking seat, and the lower locking rack is matched with the upper locking rack.

[0014] Further optimization: the scissor type support assembly comprises a first support arm and a second support arm arranged in cross, the middle of the first support arm and the middle of the second support arm are hingedly connected together, the upper ends of the first support arm and the second support arm are respectively hingedly installed on the two ends of the bottom of the support table surface, the lower end of the first support arm is rotatably connected with the bottom frame through a hinge shaft, and the lower end of the second support arm is slidably installed on the bottom frame.

[0015] Further optimization: the lower end of the second support arm is fixedly installed on a cross beam, the cross beam is arranged in parallel with the hinge shaft, a locking seat is installed on the cross beam, both ends of the cross beam are respectively fixedly provided with sliding seats, both inner walls of the chassis are respectively provided with sliding grooves, the sliding seats are slidingly installed in the corresponding sliding grooves, a limit height signal switch is arranged at the sliding end of one sliding groove, and a limiting rod is arranged at the sliding end of the other sliding groove.

[0016] The utility model discloses the above-mentioned technical scheme has the following beneficial effects:

[0017] 1、The utility model discloses the above-mentioned technical scheme, clever design, reasonable in structure adopt the table type hydraulic lifting structure, realize the wide range position adjustment of rear dynamometer, thereby satisfy the wide range wheel base adjustment demand of new energy passenger car inspection, realize one machine multi -use, and further effectively reduce the cost input of detection mechanism extension line, be favorable to the popularization of new energy vehicle electric safety detection.

[0018] 2、The overall structure of the inspection bench is simple, not only convenient to adjust, reliable in use, convenient for actual production application, and low in failure rate, reduces the maintenance cost in the early stage. DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0020] Figure 1 It is the schematic diagram of the overall structure in the embodiment of the utility model;

[0021] Figure 2 It is the top view schematic diagram of Figure 1 ;

[0022] Figure 3 It is the sectional view schematic diagram of Figure 2 A-A direction;

[0023] Figure 4 It is the sectional view schematic diagram of Figure 2 B-B direction;

[0024] Figure 5 It is the structural schematic diagram of lifting platform in the embodiment of the utility model.

[0025] In the figure: 1, frame; 11, rear frame; 12, front frame; 13, middle cover plate; 14, sliding frame; 2, front dynamometer; 3, lifting platform; 31, base frame; 32, support table; 33, hinged shaft; 34, hydraulic cylinder; 35, first support arm; 36, second support arm; 37, cross beam; 38, sliding seat; 39, sliding groove; 4, rear dynamometer; 5, servo drive; 51, servo motor; 52, transmission screw; 53, nut seat; 6, front guide table; 7, rear guide table; 8, lifting control device; 81, initial height signal switch; 82, limit height signal switch; 83, locking assembly; 831, limit rod; 832, double-acting cylinder; 833, upper locking rack; 834, locking seat; 835, lower locking rack; 9, rotating engagement wheel. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] Embodiment one

[0028] As Figures 1-4 Commonly shown, a new energy passenger vehicle chassis test bench, including frame 1, frame 1 is installed with rear dynamometer 4, table type hydraulic lifting device and front dynamometer 2 in proper order, front dynamometer 2 is installed on frame 1 through servo drive 5 sliding forward and backward, front and rear ends of front dynamometer 2 are connected with front guide table 6 and rear guide table 7 respectively, table type hydraulic lifting device includes two lifting platform groups arranged left and right, lifting platform group includes several lifting platforms 3 arranged from rear to front in proper order, lifting control device 8 is arranged on each lifting platform 3.

[0029] In the embodiment, the overall structure of the test bench is simple, and is not prone to failure or damage. Moreover, the flatness of the entire device is high, and the fluctuation of the new energy passenger vehicle driving on the test bench during the detection process is small, and the experience is good.

[0030] Among them, the two ends of the top of the frame 1 are respectively fixed with the rear frame 11 and the front frame 12, the front frame 12 and the rear frame 11 are jointly fixed with the middle cover plate 13, the rear dynamometer 4 is fixed on the rear frame 11, the middle cover plate 13 is arranged between the two lifting platform groups, the front dynamometer 2 is fixedly installed on a sliding frame 14, and the sliding frame 14 is slidingly installed on the frame 1 in the front-rear direction.

[0031] In the embodiment, the front dynamometer 2 and the rear dynamometer 4 both adopt the drum-type dynamometer that can be purchased on the market.

[0032] In the embodiment, the width of the front frame 11 is 500 mm.

[0033] In the embodiment, the width of the front guide table 6 and the rear guide table 7 is 580 mm.

[0034] The rear dynamometer 4 is fixed, and only the front dynamometer 2 is moved, the front dynamometer 2 is adjusted within 500 mm of the wheelbase size on the front frame 12, and the wheelbase size greater than 500 mm is adjusted through the take-off and landing lifting table 3.

[0035] As shown in Figs. 1 and 2, the lifting table 3 is arranged on the front frame 11 and the rear frame 10. Figure 3 and Figure 4 As shown in Figs. 1 and 2, the lifting table 3 is arranged on the front frame 11 and the rear frame 10.

[0036] In the embodiment, the servo motor 51 and the input end of the lifting table 3 can also be electrically connected to the output end of a control unit, the control unit calculates the driving distance of the servo motor 51 according to the wheelbase size of the vehicle to be detected, the pitch of the transmission screw 52, the current distance between the front dynamometer 2 and the rear dynamometer 4, and the height position of each lifting table 3, and sends instructions to control the lifting table 3 to rise and fall and the servo motor 51 to work, thereby completing the automatic adjustment of the wheelbase size.

[0037] The specific control process is as follows: first, the inspector inputs the wheelbase of the vehicle to be detected into the control unit, the control unit first calculates the distance to be adjusted according to the difference between the wheelbase size of the vehicle and the distance between the rear dynamometer 4 and the front dynamometer 2;

[0038] Then, the number of revolutions of the servo motor 51 is calculated according to the calculated adjustment distance, and the servo motor 51 is controlled to work to drive the front dynamometer 2 to move;

[0039] After that, the moving distance of the front dynamometer 2 is obtained in real time according to the number of revolutions of the servo motor 51, and when the predetermined adjustment distance is reached, the servo motor 51 is immediately controlled to stop working, thereby realizing the automatic adjustment of the inspection wheelbase;

[0040] Finally, the new energy passenger car drives onto the test bench to check and test the safety device.

[0041] Moreover, the transmission screw 52 is rotatably installed on the frame 1, the transmission screw 52 extends along the sliding direction of the sliding frame 14, the transmission screw 52 is fixedly connected with the motor shaft of the servo motor 51, the nut seat 53 is threadedly installed on the transmission screw 52, and the nut seat 53 is fixedly connected with the sliding frame 14.

[0042] In the embodiment, the transmission screw 52 and the nut seat 53 constitute a screw nut mechanism. In the embodiment, the transmission screw 52 and the nut seat 53 constitute a screw nut mechanism.

[0043] The position adjustment principle of the front dynamometer 2 is as follows: the motor shaft of the servo motor 51 rotates to drive the transmission screw rod 52 to rotate, the transmission screw rod 52 in rotation drives the nut seat 53 to move along the horizontal direction, thereby driving the sliding frame 14 to move forward and backward, so as to realize the position adjustment of the front dynamometer 2.

[0044] In the embodiment, the rear dynamometer 4 is fixed, and the front dynamometer 2 is driven by the servo transmission device 5 to approach or move away, so as to detect new energy passenger vehicles with different wheelbase, realize one machine with multiple uses, reduce the use cost, save the factory site, and the front dynamometer 2 can smoothly move with the sliding frame 14 to form effective support for the new energy passenger vehicle running on the test bench.

[0045] As shown in Figure 1 and Figure 2 , the front end of the front guide table 6 and the rear end of the rear guide table 7 are both installed with the rotating link wheel 9.

[0046] In the embodiment, the rear end of the front guide table 6 is fixedly connected with the front end of the front dynamometer 2, and the front end of the rear guide table 7 is fixedly connected with the rear end of the front dynamometer 2.

[0047] In the embodiment, the setting of the link wheel 9 facilitates the link of the front guide table 6 and the rear guide table 7 with the support table surface 32 of the other lifting table 3, and improves the smoothness of the movement of the front dynamometer 2.

[0048] When the front dynamometer 2 is in the maximum wheelbase position, the front end of the front guide table 6 is pressed against the front frame 12, and the rear end of the rear guide table 7 is pressed against the support table surface 32 of the lifting table 3; when the front dynamometer 2 is in the minimum wheelbase position, the rear end of the rear guide table 7 is pressed against the rear frame 11, and the front end of the front guide table 6 is pressed against the support table surface 32 of the lifting table 3; when the front dynamometer 2 is in other wheelbase positions, the front end of the front guide table 6 and the rear end of the rear guide table 7 are respectively pressed against different support table surfaces 32.

[0049] Therefore, the front guide table 6 and the rear guide table 7 are supported by the lifting table 3, the rear frame 11 and the front frame 12 to ensure the support reliability of the test bench for the new energy passenger vehicle, and the problem of severe bumping of the new energy passenger vehicle is avoided.

[0050] Embodiment two

[0051] The embodiment is basically the same as embodiment one, and the difference is that:

[0052] As shown in Figure 1 , Figure 3 and Figure 5As shown, the lifting platform 3 comprises a bottom frame 31 and a support platform 32 arranged in parallel, a scissor support assembly is arranged between the support platform 32 and the bottom frame 31, one end of the lower end of the scissor support assembly is rotatably connected to one end of the bottom frame 31 through a hinge shaft 33, a hydraulic cylinder 34 is hingedly connected between the hinge shaft 33 and the upper end of the scissor support assembly, and the other end of the lower end of the scissor support assembly is slidably connected to the other end of the bottom frame 31.

[0053] In this embodiment, the number of lifting platforms 3 in the lifting platform group is preferably 8.

[0054] In this embodiment, the width of the support platform 32 is 490 mm, and the length is 1130 mm.

[0055] In this embodiment, the lifting platform 3 is a scissor hydraulic lifter, and the left and right two are a group, the width of the front and rear two groups of lifting platforms 3 is equal to the width of the front dynamometer 2, and after the front dynamometer 2 moves, the lifting platform is raised to support the new energy passenger vehicle driving onto the test bench.

[0056] In this embodiment, the block type coordination between each lifting platform 3 is achieved, so that the adjustable wheelbase range of the utility model is 1600 mm to 4600 mm, the adjustable range is large, which not only meets the detection needs of all current new energy passenger vehicles, but also reserves enough space for increasing the wheelbase.

[0057] Taking the detection of Wuling NanoEV as an example, the wheelbase size of Wuling NanoEV is 1600 mm, at this time, the last section is maintained by the rear frame 11, the last 3 groups of lifting platforms 3 are lowered, the front dynamometer 2 is moved to the last side lifting platform 3 with the same height at this moment, and the front 5 groups of lifting platforms 3 are all raised (500 mm rear frame 11 + 1000 mm center distance between the front dynamometer 2 and the rear dynamometer 4 = 1500 mm, and the remaining 100 mm is adjusted in size by the 580 mm front guide platform 6 and the rear guide platform 7), which facilitates the support of the detection vehicle driving onto the test bench, thereby realizing the detection of the 1600 mm wheelbase vehicle.

[0058] Taking the detection of Dongfeng Kange T8 as an example, the wheelbase size of Dongfeng Kange T8 is 4198 mm, the first section is maintained by the front frame 12, the first 3 groups of lifting platforms 3 are lowered, the front dynamometer 2 is moved to the front, and the last 5 groups of lifting platforms 3 are raised, which facilitates the support of the detection vehicle, and realizes the detection of the 4198 mm wheelbase new energy passenger vehicle.

[0059] As Figure 5As shown, the lifting control device 8 comprises an initial height signal switch 81, a limit height signal switch 82 and a locking assembly 83 for locking the sliding end of the scissor support assembly, the initial height signal switch 81 is arranged at the middle of the chassis 31 at one end of which the hinge shaft 33 is not arranged, the limit height signal switch 82 and the locking assembly 83 are both arranged at the rear side of the sliding end of the scissor support assembly.

[0060] In the embodiment, the initial height signal switch 81 and the limit height signal switch 82 are both travel switches available on the market.

[0061] In the embodiment, the arrangement of the initial height signal switch 81, the limit height signal switch 82 and the locking assembly 83 effectively prevents the lifting of the lifting platform 3 from affecting the normal movement of the front dynamometer 2, thereby ensuring the accurate adjustment of the position of the front dynamometer 2.

[0062] Moreover, the locking assembly 83 comprises a limit rod 831, one end of the limit rod 831 is hingedly arranged on the chassis 31 away from the sliding end of the scissor support assembly, a double-acting cylinder 832 is fixed between the other end of the limit rod 831 and the chassis 31, an upper locking rack 833 is fixed on the free end of the limit rod 831, a locking seat 834 is fixed on the sliding end of the scissor support assembly, a lower locking rack 835 is fixed on the locking seat 834, and the lower locking rack 835 is adapted to the upper locking rack 833.

[0063] In the embodiment, the control unit can also be electrically connected with the hydraulic cylinders 34, the initial height signal switch 81, the limit height signal switch 82 and the double-acting cylinder 832 on the lifting platform 3.

[0064] The control unit controls the corresponding hydraulic cylinders 34 to act according to the wheelbase size of the vehicle to be detected and the position of the rear dynamometer 2, thereby driving the corresponding lifting platform 3 to rise or fall.

[0065] The initial height signal switch 81 and the limit height signal switch 82 are used for limit detection of the lifting position of the lifting platform 3, when the cross beam 37 hits the initial height signal switch 81, it proves that the lifting platform 3 has fallen to the lowest position, the initial height signal switch 81 feeds back a signal to the control unit to control the hydraulic cylinders 34 to stop the contraction action and remain, on the contrary, when the cross beam 37 hits the limit height signal switch 82, it proves that the lifting platform 3 has been raised to the set height, the limit height signal switch 82 feeds back a signal to the control unit to control the hydraulic cylinders 34 to stop the extension action and remain.

[0066] At this time, the height of the table top 32 supported on the lifting platform 3 allows the new energy passenger vehicle to pass, and the control unit sends a locking instruction to the double-acting cylinder 832, controls the double-acting cylinder 832 to perform a contraction action, the limiting rod 831 rotates downward, and the upper locking rack 833 is engaged with the lower locking rack 835, a mechanical locking action is completed, and the fixing of the lifting platform 3 is realized, so that the new energy passenger vehicle is stably and reliably supported.

[0067] In the embodiment, the control unit is added, and the automatic operation of the wheelbase adjustment work is realized, and the user does not need to intervene in the intermediate process.

[0068] As shown in Figure 3 and Figure 5 As shown in Figs. 1 and 2, the scissors type supporting assembly comprises a first supporting arm 35 and a second supporting arm 36 which are cross arranged, the middle parts of the first supporting arm 35 and the second supporting arm 36 are hingedly connected together, the upper end parts of the first supporting arm 35 and the second supporting arm 36 are respectively hingedly installed at two ends of the bottom of the supporting table top 32, the lower end part of the first supporting arm 35 is rotatably connected with the chassis 31 through a hinge shaft 33, and the lower end part of the second supporting arm 36 is slidingly installed on the chassis 31.

[0069] In addition, the lower end part of the second supporting arm 36 is fixedly installed on a cross beam 37 which is parallel to the hinge shaft 33, a locking seat 834 is installed on the cross beam 37, both end parts of the cross beam 37 are respectively fixedly installed with sliding seats 38, both inner walls of the chassis 31 are respectively provided with sliding grooves 39, the sliding seats 38 are slidingly installed in the corresponding sliding grooves 39, a limiting height signal switch 82 is arranged at the sliding end of one of the sliding grooves 39, and a limiting rod 831 is arranged at the sliding end of the other sliding groove 39.

[0070] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A test bench for new energy passenger vehicle chassis, comprising a rack (1), characterized in that, The rear dynamometer (4), the table type hydraulic lifting device and the front dynamometer (2) are sequentially arranged on the frame (1), the front dynamometer (2) is slidably arranged on the frame (1) through the servo transmission device (5), the front and rear ends of the front dynamometer (2) are respectively connected with the front guide table (6) and the rear guide table (7), the table type hydraulic lifting device comprises two lifting table groups arranged left and right, each lifting table group comprises a plurality of lifting tables (3) arranged from rear to front, and each lifting table (3) is provided with a lifting control device (8).

2. The test bench for new energy passenger vehicle chassis according to claim 1, characterized in that, The rear frame (11) and the front frame (12) are respectively arranged at the two ends of the top of the frame (1), the middle cover plate (13) is fixed between the front frame (12) and the rear frame (11), the rear dynamometer (4) is fixed on the rear frame (11), the middle cover plate (13) is arranged between the two lifting table groups, and the front dynamometer (2) is fixedly arranged on the sliding frame (14) and slidably arranged on the frame (1) in the front-rear direction.

3. The test bench for new energy passenger vehicle chassis according to claim 2, characterized in that, The servo transmission device (5) comprises a servo motor (51) fixedly arranged on the frame (1), a transmission screw rod (52) rotatably arranged on the frame (1), the transmission screw rod (52) extending along the sliding direction of the sliding frame (14), the transmission screw rod (52) fixedly connected with the motor shaft of the servo motor (51), and a nut seat (53) threadedly arranged on the transmission screw rod (52) and fixedly connected with the sliding frame (14).

4. The test bench for new energy passenger vehicle chassis according to claim 3, characterized in that, The front end of the front guide table (6) and the rear end of the rear guide table (7) are both provided with a rotating connecting wheel (9).

5. The test bench for new energy passenger vehicle chassis according to claim 2, characterized in that, The lifting table (3) comprises a bottom frame (31) and a support table (32) arranged in parallel, a scissor type support assembly is arranged between the support table (32) and the bottom frame (31), one end of the lower end of the scissor type support assembly is rotatably arranged on one end of the bottom frame (31) through a hinge shaft (33), a hydraulic oil cylinder (34) is arranged between the hinge shaft (33) and the upper end of the scissor type support assembly, and the other end of the lower end of the scissor type support assembly is slidably arranged on the other end of the bottom frame (31).

6. The test bench for new energy passenger vehicle chassis according to claim 5, characterized in that, The lifting control device (8) comprises an initial height signal switch (81), a limiting height signal switch (82) and a locking assembly (83) for locking the sliding end of the scissor type support assembly, the initial height signal switch (81) is arranged on the middle of the bottom frame (31) without the hinge shaft (33), and the limiting height signal switch (82) and the locking assembly (83) are both arranged on the rear side of the sliding end of the scissor type support assembly.

7. The test bench for new energy passenger vehicle chassis according to claim 6, characterized in that, The locking assembly (83) comprises a limiting rod (831) hingedly connected to the bottom frame (31) at one end away from the sliding end of the scissor support assembly, a double-acting cylinder (832) fixed between the other end of the limiting rod (831) and the bottom frame (31), an upper locking rack (833) fixed to the free end of the limiting rod (831), a locking seat (834) fixed to the sliding end of the scissor support assembly, a lower locking rack (835) fixed to the locking seat (834), and the lower locking rack (835) is adapted to the upper locking rack (833).

8. The test bench for new energy passenger vehicle chassis according to claim 7, characterized in that, The scissor support assembly comprises a first support arm (35) and a second support arm (36) arranged in cross, the middle portions of the first support arm (35) and the second support arm (36) are hingedly connected together, the upper ends of the first support arm (35) and the second support arm (36) are respectively hingedly installed at the two ends of the bottom of the support table (32), the lower end of the first support arm (35) is rotatably connected to the bottom frame (31) through a hinge shaft (33), and the lower end of the second support arm (36) is slidingly installed on the bottom frame (31).

9. The test bench for new energy passenger vehicle chassis according to claim 8, characterized in that, The lower end of the second support arm (36) is fixedly installed on a cross beam (37) arranged in parallel with the hinge shaft (33), the locking seat (834) is installed on the cross beam (37), the two ends of the cross beam (37) are respectively fixedly installed with sliding seats (38), the two inner walls of the bottom frame (31) are respectively provided with sliding grooves (39), the sliding seats (38) are slidingly installed in the corresponding sliding grooves (39), a limiting height signal switch (82) is arranged at the sliding end of one of the sliding grooves (39), and the limiting rod (831) is arranged at the sliding end of the other sliding groove (39).

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