An electric vehicle plastic parts impact test bench

Abstract

The present invention discloses an impact test bench for plastic parts of electric vehicles, which is applied to the technical field of impact test benches, and comprises a support assembly, wherein the support assembly comprises two groups of brackets, a top plate fixed on the two groups of brackets, a hook and a guide wheel 2 fixed below the top plate, the hook and the guide wheel 2 are respectively arranged on both sides of a connecting rod, one side of one group of the brackets is fixed with two groups of cameras, the two groups of cameras are arranged up and down, and the heights of the two groups of cameras are arranged equidistantly; a side plate fixed on the fixed plate, the side plate is arranged below the guide wheel 3, the side plate is connected with a rocker arm through rotation driving, a cylinder is fixed on the side of the rocker arm close to the sliding rod, and a lubrication gun is fixed on the output end of the cylinder. The present invention has the characteristics of being able to avoid the quality of the plastic parts affected by the change of the falling speed in advance through trial operation, and no manual lubrication is required to save manpower.

Description

Technical Field

[0001] The invention relates to the technical field of plastic parts impact test benches, in particular to an electric vehicle plastic parts impact test bench. Background Art

[0002] With the development of science and technology and the improvement of people's living standards, electric vehicles have become a more popular means of transportation. In order to reduce the cost and weight of electric vehicles, existing electric vehicles need to use more plastic parts, such as center covers, pedals, seat barrels, battery boxes, instrument covers, rear fenders, etc.

[0003] The quality of the above-mentioned plastic parts directly affects the service life and safety of electric vehicles. Therefore, for the plastic parts on the above-mentioned electric vehicles, it is necessary to perform impact testing on the plastic parts. During the testing, the existing impact test bench cannot determine whether its own impact speed is affected by the slide bar, nor can it automatically lubricate and oil, so the efficiency is low. Therefore, it is necessary to provide an electric vehicle plastic parts impact test bench that can be tested to avoid in advance the impact of changes in the landing speed on the quality of the punched plastic parts, and does not require manual lubrication to save manpower. Summary of the invention

[0004] The purpose of the present invention is to provide an electric vehicle plastic parts impact test bench to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an electric vehicle plastic parts impact test bench, comprising a support assembly, an impact assembly, a lifting drive assembly, a bearing assembly and a lubrication assembly, wherein the impact assembly is arranged in the support assembly, the lifting drive assembly is connected to the impact assembly, the bearing assembly is arranged below the support assembly, and the lubrication assembly is arranged on one side of the support assembly;

[0006] The support assembly includes two groups of brackets, a top plate fixed on the two groups of brackets, a hook and a guide wheel 2 fixed below the top plate, a connecting rod fixed in the middle of the top plate, a connecting plate fixed at the bottom of the connecting rod, the hook and the guide wheel 2 are respectively arranged on both sides of the connecting rod, and two groups of cameras are fixed on one side of one group of the brackets, the two groups of cameras are arranged up and down, and the heights of the two groups of cameras are arranged equidistantly;

[0007] The lubrication assembly includes a fixed plate fixed on the bracket and a guide wheel three fixed on the fixed plate, a side plate fixed on the fixed plate, the side plate is arranged below the guide wheel three, the side plate is connected to a rocker arm through a rotational drive, a cylinder is fixed on the side of the rocker arm close to the sliding rod, and a lubrication gun is fixed to the output end of the cylinder.

[0008] According to the above technical solution, the impact assembly includes a sliding rod fixed on both sides of a connecting plate, an impact plate arranged on the sliding rod, the impact plate and the sliding rod are connected by a linear bearing, two groups of mounting seats are fixed above the impact plate, a guide wheel is connected by a bearing between the two groups of mounting seats, a pad is fixed below the impact plate, an impact column is fixed on the pad, and a buffer pad is arranged on the impact column.

[0009] According to the above technical solution, a mounting shell is sleeved on the end of the cylinder, and a frame is fixedly connected between the mounting shell and the rocker arm.

[0010] According to the above technical solution, the lifting drive assembly includes a support plate and a rope fixed on one side of the bracket, the support plate is provided with a driving wheel, one end of the rope is wound around the driving wheel, the rope passes through guide wheel three, guide wheel two and guide wheel one in sequence, the other end of the rope is fixed to the hook, the driving wheel is fixedly connected with a driven gear, one side of the driven gear is meshed with a driving gear, one side of the driving gear is connected with a clutch, one side of the clutch is fixed with a motor drive, one side of the motor drive is fixed with a mounting plate one, and the mounting plate one is fixedly connected to the support plate.

[0011] According to the above technical solution, a mounting frame is fixed to one side of the support plate, a central plate is fixed to the mounting frame, a through slot one is opened on the central plate, a pull rod is arranged in the through slot one, the pull rod and the through slot one are connected by a bearing, a round head is arranged on the side of the pull rod close to the driving gear, and the round head is wrapped with rubber material.

[0012] According to the above technical solution, the bearing assembly includes a bearing platform fixed between two groups of brackets, a fixing block is fixed on the top of the bearing platform, a square groove is opened in the middle of the bearing platform, a lower mounting plate is fixed on the top of the fixing block, an upper mounting plate is fixed on the top of the lower mounting plate, the lower mounting plate and the upper mounting plate are fixed by threaded nuts, and two through grooves are opened on the lower mounting plate and the through grooves of the lower mounting plate and the upper mounting plate penetrate each other.

[0013] According to the above technical solution, a step is arranged above the second through slot on the lower mounting plate, a protrusion is arranged on the second through slot of the upper mounting plate, the protrusion matches the step, and a pressure sensor is arranged at the step of the second through slot on the lower mounting plate.

[0014] According to the above technical solution, the end of the sliding rod is fixed on the bearing platform, and a buffer spring is sleeved on the sliding rod and the bearing platform.

[0015] In addition, in order to achieve the above-mentioned purpose, the present application also provides a method for an electric vehicle plastic part impact test bench, the method is used for an electric vehicle plastic part impact test bench as described above, and the method comprises the following steps:

[0016] Step 1: Before impacting the plastic part, control the impact assembly to test run through the lifting drive assembly to determine whether the impact assembly's falling speed will change, and apply lubricating oil to the slide bar to prevent the change in falling speed from affecting the quality of the impacted plastic part;

[0017] Step 2: After the trial run is completed, install the plastic parts on the load-bearing assembly, and then start the impact assembly to work formally. When the impact assembly is working, the pressure change detected by the pressure sensor is used to determine whether the impact force is uniform;

[0018] Step 3: When inspecting plastic parts, the camera takes a picture of the surface of the plastic part and transmits it to the control system. The control system uses an internal program to determine whether the plastic part is deformed, thereby judging the quality of the plastic part.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are: the present invention, by providing an impact assembly and a bearing assembly, can be tested to avoid in advance the impact on the quality of the punched plastic parts caused by changes in the falling speed, and no manual lubrication is required to save manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a side schematic diagram of the overall structure of the present invention;

[0023] Figure 3 The present invention Figure 1 Schematic diagram of area A;

[0024] Figure 4 The present invention Figure 1 Schematic diagram of area B;

[0025] Figure 5 is a three-dimensional schematic diagram of the bearing assembly of the present invention;

[0026] Figure 6 is a two-dimensional schematic diagram of the bearing assembly of the present invention;

[0027] Figure 7 The present invention Figure 2 Schematic diagram of the C region;

[0028] In the figure: 1. bracket; 2. buffer spring; 3. slide bar; 4. top plate; 5. impact plate; 6. connecting plate; 7. guide wheel one; 8. bearing platform; 9. driving wheel; 10. rope; 11. camera; 12. fixing plate; 13. guide wheel three; 14. rocker arm; 15. cylinder; 16. lubrication gun; 17. connecting frame; 18. mounting shell; 19. side plate; 20. support plate; 21. driven gear; 22. mounting frame; 23. central plate; 24. pull rod; 25. mounting plate one; 26. motor drive; 27. clutch; 28. driving gear; 29. ​​fixing block; 30. upper mounting plate; 31. pad; 32. impact column; 33. lower mounting plate; 34. pressure sensor; 35. speed sensor. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1-7 The present invention provides a technical solution: an electric vehicle plastic part impact test bench, comprising a support assembly, an impact assembly, a lifting drive assembly, a bearing assembly and a lubrication assembly. The impact assembly is arranged in the support assembly, the lifting drive assembly is connected to the impact assembly, the bearing assembly is arranged below the support assembly, and the lubrication assembly is arranged on one side of the support assembly for lubricating the components on the impact assembly to improve the impact stability. When it is necessary to impact the electric vehicle plastic part, the plastic part is installed on the bearing assembly, the lifting drive assembly is closed to allow the impact assembly to fall freely to impact the plastic part on the bearing assembly, and the quality of the plastic part is judged.

[0031] The supporting assembly includes two groups of brackets 1, a top plate 4 fixed on the two groups of brackets 1, a hook and two guide wheels fixed under the top plate 4, a connecting rod fixed in the middle of the top plate 4, a connecting plate 6 fixed at the bottom of the connecting rod, the hook and the two guide wheels are respectively arranged on both sides of the connecting rod, and two groups of cameras 11 are fixed on one side of one group of brackets 1, the two groups of cameras 11 are arranged up and down, and the heights of the two groups of cameras 11 are equidistantly arranged.

[0032] The impact assembly includes a slide bar 3 fixed on both sides of a connecting plate 6, an impact plate 5 arranged on the slide bar 3, the impact plate 5 and the slide bar 3 are connected by a linear bearing, two groups of mounting seats are fixed above the impact plate 5, a guide wheel 7 is connected by a bearing between the two groups of mounting seats, a pad 31 is fixed below the impact plate 5, an impact column 32 is fixed on the pad 31, a buffer pad is arranged on the impact column 32, when the impact plate 5 falls freely on the slide bar 3, the impact column 32 impacts the surface of the plastic part, and a speed sensor 35 is fixed on one side of the impact plate 5.

[0033] The lubrication assembly includes a fixed plate 12 fixed on the bracket 1 and a guide wheel 3 13 fixed on the fixed plate 12, a side plate 19 fixed on the fixed plate 12, and the side plate 19 is arranged below the guide wheel 3 13. The side plate 19 is connected to a swing rod 14 through a rotation drive. A cylinder 15 is fixed on the side of the swing rod 14 close to the slide rod 3. A lubrication gun 16 is fixed on the output end of the cylinder 15. The rotation drive is started to drive the swing rod 14 to rotate so that the lubrication gun 16 is aimed at the slide rod 3. The output end of the cylinder 15 is extended to drive the lubrication gun 16 close to the slide rod 3. The lubrication gun 16 is turned on to facilitate lubrication of the slide rod 3.

[0034] The end of the cylinder 15 is covered with a mounting shell 18, and a connecting frame 17 is fixed between the mounting shell 18 and the rocker arm 14. The connecting frame 17 stabilizes the cylinder 15. When the slide rod 3 does not need to be lubricated, the rocker arm 14 is controlled to move away from the slide rod 3 through rotation drive to avoid affecting the operation of the impact assembly.

[0035] The lifting drive assembly includes a support plate 20 and a rope 10 fixed on one side of the bracket 1, the support plate 20 is provided with a driving wheel 9, one end of the rope 10 is wound around the driving wheel 9, the rope 10 passes through the guide wheel 3 13, the guide wheel 2 and the guide wheel 1 7 in sequence, the other end of the rope 10 is fixed to the hook, the driving wheel 9 is fixedly connected with a driven gear 21, one side of the driven gear 21 is meshed with a driving gear 28, one side of the driving gear 28 is connected with a clutch 27, one side of the clutch 27 is fixed with a motor drive 26, one side of the motor drive 26 is fixed with a mounting plate 1 25, and the mounting plate 1 25 is fixedly connected to the support plate 20; The starting motor drive 26 controls the clutch 27 to drive the driving gear 28 to rotate, and then drives the driven gear 21 to rotate, thereby controlling the driving wheel 9 to rotate and wind the rope 10 to hang the impact plate 5 above. When the impact plate 5 needs to work, the clutch 27 is closed so that the driving gear 28 is not affected by the motor drive 26. At this time, the impact plate 5 falls due to gravity, and the guide wheel 17 on the top of the impact plate 5 follows the fall, driving the rope 10 to move downward, and the driving wheel 9 is rotated by the action of the guide wheel 3 13 and the guide wheel 2. Since the clutch 27 is closed, the driving gear 28 is not restricted, so that the driving wheel 9 is not restricted and the rope 10 is driven.

[0036] A mounting frame 22 is fixed to one side of the support plate 20, and a central plate 23 is fixed to the mounting frame 22. A through slot 1 is opened on the central plate 23, and a pull rod 24 is arranged in the through slot 1. The pull rod 24 is connected to the through slot 1 by a bearing, and a tension mechanism (shown in the figure) is connected to the top of the pull rod 24. A round head is arranged on the side of the pull rod 24 close to the driving gear 28, and the round head is wrapped with rubber material. In order to ensure the stability of the impact plate 5 at the top so that it will not fall, when the impact plate 5 is at the top, the pull rod 24 is pulled by an external tension mechanism to rotate in the through slot 1 so that the round head at the end of the pull rod 24 contacts with the driving gear 28, which can resist the driving gear 28, and at the same time reduce the force on the clutch 27 to increase its service life.

[0037] The pulling mechanism is an existing cylinder or telescopic rod mechanism, and the pulling rod 24 can be pulled by starting the pulling mechanism.

[0038] The bearing assembly includes a bearing platform 8 fixed between two groups of brackets 1, a fixing block 29 is fixed on the top of the bearing platform 8, a square groove is opened in the middle of the bearing platform 8, a lower mounting plate 33 is fixed on the top of the fixing block 29, an upper mounting plate 30 is fixed on the top of the lower mounting plate 33, the lower mounting plate 33 and the upper mounting plate 30 are fixed by threaded nuts, and the lower mounting plate 33 and the upper mounting plate 30 are both provided with a through groove 2, and the through grooves of the lower mounting plate 33 and the upper mounting plate 30 penetrate each other;

[0039] A step is provided above the through slot 2 on the lower mounting plate 33, and a protrusion is provided on the through slot 2 of the upper mounting plate 30, and the protrusion matches the step, and a pressure sensor 34 is provided at the step of the through slot 2 on the lower mounting plate 33;

[0040] When the electric vehicle plastic parts need to be installed, the plastic parts are placed on the step of the lower mounting plate 33, and then the upper mounting plate 30 is covered on the lower mounting plate 33. At this time, the protrusions on the upper mounting plate 30 are in contact with the surface of the plastic parts, and finally the upper mounting plate 30 and the lower mounting plate 33 are fixed by threaded nuts. At this time, the plastic parts can be better fixed by matching the protrusions with the steps, and the threaded nuts can be prevented from being directly fixed on the plastic parts by matching the protrusions with the steps, which affects the quality of the plastic parts surface. After the plastic parts are fixed, the pressure sensor 34 will detect the current pressure, and then transmit it to the control system to record the pressure.

[0041] The end of the slide bar 3 is fixed on the bearing platform 8 , and a buffer spring 2 is sleeved on the slide bar 3 and the bearing platform 8 , so that the buffer spring 2 plays a buffering role on the impact plate 5 .

[0042] An electric vehicle plastic component impact test bench also includes a control system, which is electrically connected to a speed sensor 35 , a pressure sensor 34 and a camera 11 .

[0043] Working principle:

[0044] Before impacting plastic parts, the impact assembly is controlled by the lifting drive assembly to test run to determine whether the falling speed of the impact assembly will change, and lubricating oil is applied to the slide bar to prevent the change in the falling speed from affecting the quality of the impacted plastic parts.

[0045] Specifically, when the impact assembly falls, the falling speed of the impact plate 5 is detected by the speed sensor 35, and the change of the falling speed at different heights is identified by the camera 11, and the signal is transmitted to the control system. When it is identified that the speed of the impact plate 5 is decreasing and the decreasing speed passing through the upper camera 11 and the lower camera 11 becomes faster, it means that the lubrication degree on the slide bar 3 is low, indicating that there is an obstacle on the slide bar 3 affecting the falling speed of the impact plate 5, and the signal is transmitted to the staff for processing by the staff; when the speed of the impact plate 5 is decreasing and the decreasing speed passing through the upper camera 11 and the lower camera 11 becomes slower, it means that the lubrication degree on the slide bar 3 is medium. At this time, the lubrication assembly is controlled to rotate to the slide bar 3, and the lubrication gun 16 is controlled to lubricate the slide bar 3 without affecting the falling speed of the impact plate 5; when the falling speed of the impact plate 5 does not change, the subsequent impact work can be carried out directly. This step can avoid the quality of the plastic parts affected by the change of the falling speed in advance through trial operation, and no manual lubrication is required to save manpower.

[0046] After the trial run is over, the plastic part is installed on the bearing assembly, and then the impact assembly is started to work formally. When the impact assembly is working, the pressure change detected by the pressure sensor 34 is used to determine whether the impact force is uniform. Specifically, when the impact column 32 impacts the plastic part, it will exert pressure on the plastic part, and the pressure is transmitted to the protrusion and the step. Therefore, the pressure detected by the pressure sensor 34 will suddenly increase, and the signal is transmitted to the control system. At this time, it is determined whether the value of the sudden increase in pressure around the step is uniform. If the value of the pressure increase is uneven, it means that the impact force is uneven. There is a slight height deviation between the impact plate 5 and the slide bar 3 when it descends, resulting in the bottom surface of the impact column 32 not being able to contact the surface of the plastic part instantly, but first tilting and then contacting. This shows that the lubrication of the two groups of slide bars 3 near the plastic part is not handled well. At this time, the signal is transmitted to the lubrication component and the amount of lubricating oil applied is increased. The staff handles the lubrication of the slide bar 3 near the plastic part. After the impact is completed, the lifting drive component controls the impact component to move upward back to the initial position, which is convenient for subsequent detection of the surface shape of the plastic part.

[0047] When inspecting plastic parts, the camera 11 takes a picture of the surface of the plastic part and transmits it to the control system. The control system determines whether the plastic part is deformed or whether there are cracks on the surface through an internal program (the program is set by the staff and is prior art and will not be described in detail here). If the plastic part has not changed, it means that the quality of the plastic part is high. If the shape of the plastic part has changed and the pressure of the pressure sensor 34 has not changed, it means that the peripheral thickness of the plastic part has not changed when it is subjected to concentrated impact force, indicating that although the plastic part has good plasticity, its elastic deformation ability is poor. When the shape of the plastic part changes and the pressure value of the pressure sensor 34 changes, it means that the plastic part not only has poor plasticity but also poor elastic deformation ability, proving that the plastic part is a defective product.

[0048] It should be added that when the shape of the plastic part changes, the plastic part is left to stand for a period of time, and the camera 11 takes a picture of the surface of the plastic part again and transmits it to the control system to determine whether the plastic part has returned to its original state. If the shape of the plastic part can be restored to its original state, it means that the plastic part is elastically deformed, indicating that the quality of the plastic part is excellent and can proceed to the next process. If the shape of the plastic part has not yet been restored, it means that the plastic part is plastically deformed, proving that the quality of the plastic part is poor.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric vehicle plastic parts impact test bench, comprising a support assembly, an impact assembly, a lifting drive assembly, a bearing assembly and a lubrication assembly, characterized in that: The impact assembly is arranged in the support assembly, the lifting drive assembly is connected to the impact assembly, the bearing assembly is arranged below the support assembly, and the lubrication assembly is arranged on one side of the support assembly; The support assembly comprises two groups of brackets (1), a top plate (4) fixed on the two groups of brackets (1), a hook and two guide wheels fixed below the top plate (4), a connecting rod fixed in the middle of the top plate (4), a connecting plate (6) fixed at the bottom of the connecting rod, the hook and the two guide wheels are respectively arranged on both sides of the connecting rod, and two groups of cameras (11) are fixed on one side of one group of the brackets (1), the two groups of cameras (11) are arranged up and down, and the heights of the two groups of cameras (11) are arranged equidistantly; The lubrication assembly comprises a fixing plate (12) fixed on the bracket (1) and a guide wheel three (13) fixed on the fixing plate (12), a side plate (19) fixed on the fixing plate (12), the side plate (19) being arranged below the guide wheel three (13), a swing rod (14) being connected to the side plate (19) by rotational drive, a cylinder (15) being fixed on a side of the swing rod (14) close to the slide rod (3), and a lubrication gun (16) being fixed on an output end of the cylinder (15); The impact assembly comprises a slide bar (3) fixed on both sides of a connecting plate (6), an impact plate (5) arranged on the slide bar (3), the impact plate (5) and the slide bar (3) are connected via a linear bearing, two groups of mounting seats are fixed above the impact plate (5), a guide wheel (7) is connected between the two groups of mounting seats via bearings, a pad (31) is fixed below the impact plate (5), an impact column (32) is fixed on the pad (31), and a buffer pad is arranged on the impact column (32); The lifting drive assembly comprises a support plate (20) and a rope (10) fixed on one side of the support (1), the support plate (20) being provided with a driving wheel (9), one end of the rope (10) being wound around the driving wheel (9), the rope (10) passing through guide wheel three (13), guide wheel two and guide wheel one (7) in sequence, the other end of the rope (10) being fixed on a hook, the driving wheel (9) being fixedly connected with a driven gear (21), one side of the driven gear (21) being meshed with a driving gear (28), one side of the driving gear (28) being connected with a clutch (27), one side of the clutch (27) being fixed with a motor drive (26), one side of the motor drive (26) being fixed with a mounting plate one (25), the mounting plate one (25) being fixedly connected with the support plate (20); A mounting frame (22) is fixed to one side of the support plate (20), and a central plate (23) is fixed to the mounting frame (22). A through slot 1 is provided on the central plate (23), and a pull rod (24) is provided in the through slot 1. The pull rod (24) is connected to the through slot 1 by a bearing. A round head is provided on the side of the pull rod (24) close to the driving gear (28), and the round head is wrapped with rubber material.

2. The electric vehicle plastic parts impact test bench according to claim 1, characterized in that: The end of the cylinder (15) is covered with a mounting shell (18), and a frame (17) is fixedly connected between the mounting shell (18) and the rocker rod (14).

3. The electric vehicle plastic parts impact test bench according to claim 1, characterized in that: The bearing assembly comprises a bearing platform (8) fixed between two groups of brackets (1), a fixing block (29) is fixed on the top of the bearing platform (8), a square groove is provided in the middle of the bearing platform (8), a lower mounting plate (33) is fixed on the top of the fixing block (29), an upper mounting plate (30) is fixed on the top of the lower mounting plate (33), the lower mounting plate (33) and the upper mounting plate (30) are fixed by threaded nuts, the lower mounting plate (33) and the upper mounting plate (30) are both provided with two through grooves, and the through grooves of the lower mounting plate (33) and the upper mounting plate (30) penetrate each other.

4. The electric vehicle plastic parts impact test bench according to claim 3, characterized in that: A step is arranged above the second through slot on the lower mounting plate (33), a protrusion is arranged on the second through slot of the upper mounting plate (30), the protrusion matches the step, and a pressure sensor (34) is arranged at the step of the second through slot on the lower mounting plate (33).

5. The electric vehicle plastic parts impact test bench according to claim 4, characterized in that: The end of the slide bar (3) is fixed on the bearing platform (8), and a buffer spring (2) is sleeved on the slide bar (3) and the bearing platform (8).

6. A method for an electric vehicle plastic part impact test bench, using an electric vehicle plastic part impact test bench as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following specific steps: Step 1: Before impacting the plastic part, the impact assembly is controlled to run for trial by the lifting drive assembly to determine whether the falling speed of the impact assembly will change, and lubricating oil is applied to the slide bar (3) to prevent the change in the falling speed from affecting the quality of the impacted plastic part; Step 2: After the trial run is completed, the plastic part is installed on the bearing assembly, and the impact assembly is started to work formally. When the impact assembly is working, the pressure change detected by the pressure sensor (34) determines whether the impact force is uniform; Step 3: When inspecting the plastic part, the camera (11) takes a picture of the surface of the plastic part and transmits it to the control system. The control system determines whether the plastic part is deformed through an internal program, thereby determining the quality of the plastic part.

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