Durability test board for automobile sunroof elastic sheet

Abstract

The invention, which belongs to the technical field of automobile sunroof elastic sheet testing, discloses an automobile sunroof elastic sheet durability test bench comprising a workbench, a support frame and a floating joint, and the workbench is provided with a product clamp. The supporting frame is installed on the workbench, an air cylinder is installed on the supporting frame, a lower pressing plate is arranged on the lower side of an air cylinder extending rod, and a threaded section is arranged at the end of the air cylinder extending rod. The floating connector is used for connecting the lower pressing plate and the air cylinder extension rod, and by means of the innovative design of the floating connector and the ingenious structure combination of the connecting cap and the connecting base, the characteristics of transverse insertion, threaded connection and rotation are included, and the fastening nut is matched, so that the height of the lower pressing plate is conveniently and accurately adjusted. For different types of elastic sheets with different heights, the device can be rapidly adjusted to a proper position, thereby ensuring that the elastic sheets are in an ideal stress state during testing, effectively simulating a real working condition, and greatly improving the accuracy and reliability of a test result.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive sunroof spring piece testing, and particularly to a durability testing platform for automotive sunroof spring pieces. Background Art

[0002] In the booming automotive industry today, automotive sunroofs have become standard equipment for many vehicle models, aiming to enhance the transparency of the interior space and the driving and riding comfort experience. As a key component to ensure the normal opening and closing of the sunroof, maintain good sealing performance, and buffer the movement impact, the quality and durability of the automotive sunroof spring piece are directly related to the performance of the automotive sunroof, and thus affect the user satisfaction of consumers. Therefore, strict and accurate durability testing of automotive sunroof spring pieces is an essential and important step in the automotive parts manufacturing process. In the field of automotive production, there are significant differences in the design, size, and structure of automotive sunroofs equipped with different vehicle models and brands, which directly leads to various types of automotive sunroof spring pieces. However, the downward pressing stroke of the lower pressing plate of most existing spring piece durability testing devices is preset and fixed. When testing spring pieces with a smaller size and a lower initial height, the downward pressing stroke may be too large, causing the spring pieces to be over-pressed and even damaged, affecting the accuracy of the test results and wasting test resources; while when testing spring pieces with a larger size and a higher initial height, the downward pressing stroke may be insufficient, unable to make the spring pieces reach the stress state required for normal operation, and also unable to effectively simulate the real working conditions to obtain reliable test results. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem that different types of spring pieces need to be pressed down by different distances as mentioned in the above background art.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A durability testing platform for automotive sunroof spring pieces, comprising a workbench, a support frame, and a floating joint. A product fixture is arranged on the workbench; the support frame is installed on the workbench, and a cylinder is installed on the support frame. A lower pressing plate is arranged on the lower side of the extending rod of the cylinder, and the end of the extending rod of the cylinder has a threaded section; the floating joint is used to connect the lower pressing plate and the extending rod of the cylinder. The floating joint includes a connecting cap and a connecting seat fixedly installed on the lower pressing plate. The connecting cap is horizontally moved and inserted into the connecting seat, and the connecting cap and the connecting seat are fixed longitudinally. The connecting cap is threadedly connected with the extending rod of the cylinder, and a fastening nut is arranged on the upper side of the connecting cap.

[0005] Preferably, the connecting cap includes a threaded cylinder and a first limiting part and a second limiting part fixed to the upper and lower ends of the threaded cylinder respectively. A through slot is formed in the connecting seat in the up-and-down direction, and a limiting groove recessed upward is formed on the lower surface of the connecting seat. The limiting groove communicates with the slot. The second limiting part is inserted into the limiting groove, and the connecting cap is longitudinally fixed to the connecting seat and the connecting cap can rotate, which is convenient for adjusting the height of the lower pressing plate.

[0006] Preferably, an auxiliary device is arranged on the upper side of the lower pressing plate. The auxiliary device includes auxiliary plates fixedly connected to the opposite surfaces of the first limiting part and the second limiting part. Rolling grooves are formed on the opposite surfaces of the two auxiliary plates. An upper arc plate and a lower arc plate are arranged on the connecting seat. A plurality of arc-shaped distributed balls are installed on both the upper arc plate and the lower arc plate. The upper sides of the balls are located in the rolling grooves. Through the cooperation of the balls and the rolling grooves, the rotation resistance of the connecting cap is small.

[0007] Preferably, the upper arc plate is connected to the connecting seat through an elastic member. The lower arc plate is fixedly connected to the connecting seat. The elastic member includes a rod body fixedly connected to the upper end of the upper arc plate. An elastic groove is formed in the connecting seat. The rod body is inserted into the elastic groove. A plate body is fixed to the lower end of the rod body. A first spring is sleeved on the rod body. The two ends of the first spring are respectively connected to the top wall of the elastic groove and the plate body. Through the elastic member, it is convenient to connect the connecting cap to the connecting seat.

[0008] Preferably, the moving distance of the upper arc plate is greater than the sum of the distances that the upper and lower balls protrude, which is convenient for the connecting cap to move into the connecting seat.

[0009] Preferably, a supporting component is arranged on the connecting seat. The supporting component includes symmetric support plates. The upper surfaces of the two support plates are in contact with the lower surface of the upper arc plate. The lower surfaces of the two support plates are in contact with the connecting seat. Inclined first guiding surfaces are formed at the opposite ends of the two supports. Symmetric extension plates are fixedly connected to the upper arc plate. Inclined second guiding surfaces are formed on the lower surfaces of the extension plates. Through the supporting component, the connecting cap can be stably supported.

[0010] Preferably, a side plate is fixedly connected to one side of the support plate, and a plurality of spaced protruding plates extend from the side plate.

[0011] Preferably, the supporting component further includes a bidirectional screw rotatably connected to the connecting seat, and the support plate is threadedly connected to the bidirectional screw.

[0012] Preferably, a movable auxiliary lifting member is provided on the support frame. The auxiliary lifting member includes a lifting frame which is slidably connected to the support frame. A fixing rod is fixedly connected to the lifting frame, and a lifting plate is slidably connected to the fixing rod. A second spring is sleeved on the fixing rod, and two ends of the second spring are respectively connected to the lifting plate and the lifting frame. An extension portion is provided on one side of the connecting seat, and the auxiliary lifting member reduces the resistance of the lower pressing plate to rise.

[0013] Preferably, a pressing plate is fixedly connected to one side of the lifting plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: With the innovative design of the floating joint and the delicate structural combination of the connecting cap and the connecting seat, including horizontal insertion, threaded connection and rotatable characteristics, and in cooperation with the fastening nut, the height of the lower pressing plate can be conveniently and accurately adjusted. Facing different types of elastic pieces with different heights, it can be quickly adjusted to a suitable position to ensure that the elastic piece is in an ideal stress state during testing, effectively simulating the real working condition, and greatly improving the accuracy and reliability of the test results; In the auxiliary device, the upper arc plate, the lower arc plate are matched with multiple arc-distributed balls and the corresponding rolling groove design, which support the connecting cap from multiple directions, increase the contact area, evenly disperse the pressure, not only ensure the structural stability, but also reduce the wear of components. The cooperation between the balls and the rolling grooves makes the rotation resistance of the connecting cap small. And through the liftable upper arc plate, the connecting cap and the connecting seat are connected without clearance, increasing the stability of the connection between the floating joint and the lower pressing plate; The movable auxiliary lifting member further optimizes the adjustment process. When it is necessary to adjust the height of the lower pressing plate, through the coordinated operation of the pressing plate, the lifting plate, the second spring and the extension portion of the connecting seat, the rising resistance is cleverly reduced, making the height adjustment easier and smoother. It not only saves the operation manpower, but also improves the test preparation efficiency and adapts to the high-intensity production and detection rhythm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the product fixture of the present invention.

[0018] Figure 3 It is a schematic diagram of the lower pressing plate of the present invention.

[0019] Figure 4 Schematic diagram of the floating joint of the present invention.

[0020] Figure 5 Schematic diagram of the lifting plate of the present invention.

[0021] Figure 6 Schematic diagram of the second spring and the fixing rod of the present invention.

[0022] Figure 7 Schematic diagram of the separation of the threaded barrel and the connecting seat of the present invention.

[0023] Figure 8 Schematic diagram of the limiting groove of the present invention.

[0024] Figure 9 Schematic diagram of the upper arc plate of the present invention.

[0025] Figure 10 Schematic diagram of the elastic member of the present invention.

[0026] Figure 11 Schematic diagram of the support plate and the first guiding surface of the present invention.

[0027] Figure 12 Schematic diagram of the position of the support plate after movement of the present invention.

[0028] Figure 13 Schematic diagram of the ball of the present invention.

[0029] Figure 14 Schematic diagram of the auxiliary plate of the present invention.

[0030] Figure 15 Schematic diagram of the alarm lamp process of the present invention.

[0031] Explanation of figure numbers: 1. Workbench; 11. Distance sensor; 12. Alarm lamp; 2. Support frame; 21. Linear bearing; 3. Floating joint; 31. Connecting cap; 311. Threaded barrel; 312. First limiting part; 313. Second limiting part; 32. Connecting seat; 321. Slot; 322. Limiting groove; 323. Extension part; 33. Fastening nut; 4. Product fixture; 5. Cylinder; 6. Lower pressing plate; 7. Guide rod; 8. Auxiliary device; 81. Auxiliary plate; 82. Rolling groove; 83. Upper arc plate; 831. Extension plate; 832. Second guiding surface; 84. Lower arc plate; 85. Ball; 86. Elastic member; 861. Rod body; 862. Plate body; 863. First spring; 87. Support member; 871. Support plate; 872. First guiding surface; 873. Side plate; 874. Protruding plate; 875. Bidirectional screw; 9. Auxiliary lifting member; 91. Lifting frame; 92. Fixing rod; 93. Lifting plate; 94. Second spring; 95. Pressing plate. Detailed implementation manners

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be used in other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present invention.

[0034] Those skilled in the art should understand that in the disclosure of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention in a simplified manner, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0035] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0036] Please refer to Figure 1 - Figure 15 , a durability test bench for an automotive sunroof elastic piece, including a workbench 1, a support frame 2, and a floating joint 3. A product fixture 4 is arranged on the workbench 1. As Figure 2 shown, the product fixture 4 fixes one end of the elastic piece, and the other end of the elastic piece is located below the lower pressing plate 6. The three elastic pieces from top to bottom are in the states before, during, and after downward pressing.

[0037] The support frame 2 is installed on the workbench 1. A cylinder 5 is installed on the support frame 2. A lower pressing plate 6 is arranged on the lower side of the extending rod of the cylinder 5. Two guide rods 7 are fixedly connected to the lower pressing plate 6. A linear bearing 21 is installed on the support frame 2. The guide rod 7 passes through the linear bearing 21. The linear bearing 21 enables the guide rod 7 to move linearly in the longitudinal direction. The end of the extending rod of the cylinder 5 has a threaded section.

[0038] The floating joint 3 is used to connect the lower pressing plate 6 and the extending rod of the air cylinder 5. The floating joint 3 can adjust the height of the lower pressing plate 6. The floating joint 3 includes a connecting cap 31 and a connecting seat 32 fixedly installed on the lower pressing plate 6. The connecting cap 31 is horizontally moved and inserted into the connecting seat 32. The connecting cap 31 and the connecting seat 32 are fixed longitudinally. The connecting cap 31 is threadedly connected to the extending rod of the air cylinder 5. The connecting cap 31 can rotate on the connecting seat 32. A fastening nut 33 is arranged on the upper side of the connecting cap 31, and the fastening nut 33 is used to fasten the connecting cap 31.

[0039] The connecting cap 31 includes a threaded cylinder 311 and a first limiting part 312 and a second limiting part 313 fixed at the upper and lower ends of the threaded cylinder 311 respectively. The threaded cylinder 311 has internal threads. A through slot 321 penetrating up and down is formed on the connecting seat 32. The slot 321 is used to accommodate the threaded cylinder 311. A limiting groove 322 recessed upward is formed on the lower surface of the connecting seat 32. The limiting groove 322 is communicated with the slot 321. The second limiting part 313 is inserted into the limiting groove 322. Both the slot 321 and the limiting groove 322 are U-shaped. The limiting groove 322 does not affect the rotation of the second limiting part 313. The first limiting part 312 is located above the connecting seat 32, and the second limiting part 313 is located in the limiting groove 322. Through the first limiting part 312 and the second limiting part 313, the threaded cylinder 311 can drive the connecting seat 32 to move up and down.

[0040] An auxiliary device 8 is arranged on the upper side of the lower pressing plate 6. The auxiliary device 8 includes auxiliary plates 81 fixedly connected to the opposite surfaces of the first limiting part 312 and the second limiting part 313. Rolling grooves 82 are formed on the opposite surfaces of the two auxiliary plates 81. The rolling grooves 82 are concave arcs. The rolling grooves 82 are connected end to end to form a ring. There are two rolling grooves 82 in this application. Of course, the required number can also be set according to needs. An upper arc plate 83 and a lower arc plate 84 are arranged on the connecting seat 32. A plurality of arc-distributed balls 85 are installed on both the upper arc plate 83 and the lower arc plate 84. The arc-shaped rolling grooves 82 increase the contact area of the balls 85, which is beneficial to the balls 85 supporting the threaded cylinder 311. Compared with point contact, arc contact is also beneficial to protecting the balls 85. Through the cooperation of the balls 85 and the rolling grooves 82, the rotation resistance of the connecting cap 31 is small. And through the liftable upper arc plate 83, the connecting cap 31 and the connecting seat 32 are connected without clearance, increasing the connection stability between the floating joint 3 and the lower pressing plate 6.

[0041] An installation groove is formed on the upper arc plate 83. The ball 85 is installed in the installation groove of the arc plate. There is a sealing plate in the installation groove. There are grooves on the sealing plate adapted to the ball 85. The sealing plate is fixedly connected in the installation groove, thus completing the connection between the ball 85 and the upper arc plate 83. The connection between the lower arc plate 84 and the ball 85 is the same.

[0042] The upper arc-shaped plate 83 is connected to the connecting seat 32 through an elastic member 86. The lower arc-shaped plate 84 is fixedly connected to the connecting seat 32. The elastic member 86 includes a rod body 861 with its upper end fixedly connected to the upper arc-shaped plate 83. An elastic groove is formed on the connecting seat 32. The rod body 861 is inserted into the elastic groove. A plate body 862 is fixed to the lower end of the rod body 861. A first spring 863 is sleeved on the rod body 861. Two ends of the first spring 863 are respectively connected to the top wall of the elastic groove and the plate body 862. The first spring 863 exerts a downward force on the plate body 862. When the supporting member 87 does not support the upper arc-shaped plate 83, the first spring 863 causes the upper arc-shaped plate 83 to descend, facilitating the insertion of the threaded cylinder 311.

[0043] Since the upper-side balls 85 are in contact with the upper-side rolling grooves 82 and the lower-side balls 85 are in contact with the lower-side rolling grooves 82, the moving distance of the upper arc-shaped plate 83 is greater than the sum of the protruding distances of the upper-side balls 85 and the lower-side balls 85. The protruding parts of the balls 85 are in contact with the rolling grooves 82. After the threaded cylinder 311 is inserted, the upper arc-shaped plate 83 rises, causing the upper-side and lower-side balls 85 to respectively abut against the corresponding rolling grooves 82.

[0044] A supporting member 87 is arranged on the connecting seat 32. The supporting member 87 stably supports the upper arc-shaped plate 83. The supporting member 87 includes symmetrical support plates 871. The upper surfaces of the two support plates 871 are in contact with the lower surface of the upper arc-shaped plate 83, and the lower surfaces of the two support plates 871 are in contact with the connecting seat 32. Inclined first guide surfaces 872 are formed at the opposite ends of the two supports. Symmetrical extension plates 831 are fixedly connected to the upper arc-shaped plate 83. Inclined second guide surfaces 832 are formed on the lower surfaces of the extension plates 831. The support plates 871 move to cause the extension plates 831 to rise. The extension plates 831 drive the upper arc-shaped plate 83 to rise, and the upper arc-shaped plate 83 drives the balls 85 to rise, thus enabling the balls 85 to be in contact with the rolling grooves 82.

[0045] One side of the support plate 871 is fixedly connected with a side plate 873. A plurality of spaced-apart protruding plates 874 extend from the side plate 873. After the upper arc-shaped plate 83 rises, the side plate 873 and the protruding plates 874 move to the lower side of the upper arc-shaped plate 83 and are in contact with the upper arc-shaped plate 83, thereby increasing the stability of the upper arc-shaped plate 83 after movement.

[0046] The supporting member 87 further includes a bidirectional screw 875 rotatably connected to the connecting seat 32. The support plates 871 are threadedly connected to the bidirectional screw 875. The bidirectional screw 875 causes the two support plates 871 to approach or separate from each other simultaneously.

[0047] A movable auxiliary lifting member 9 is provided on the support frame 2. The auxiliary lifting member 9 includes a lifting frame 91 which is slidably connected to the support frame 2. A fixing rod 92 is fixedly connected to the lifting frame 91. A lifting plate 93 is slidably connected to the fixing rod 92. There are two fixing rods 92, and a second spring 94 is sleeved on the fixing rods 92. The two fixing rods 92 enable the lifting plate 93 to stably lift in a straight line. The lifting plate 93 is slidably connected to the fixing rod 92 by extension. The two ends of the second spring 94 are respectively connected to the lifting plate 93 and the lifting frame 91. An extension portion 323 is provided on one side of the connecting seat 32. A pressing plate 95 is fixedly connected to one side of the lifting plate 93, and the pressing plate 95 facilitates pressing down the lifting plate 93. The lifting plate 93 is higher than the connecting seat 32 in the free state.

[0048] Further, in order to accurately adjust the height, a distance sensor 11, an alarm lamp 12, a control module and a control panel are provided on the support frame 2. A plurality of buttons are provided on the control panel. The control module is electrically connected to the distance sensor 11, the alarm lamp 12 and the control panel. The control module controls whether the alarm lamp 12 lights up through a relay. The control module is electrically connected to a memory. The control module, the control panel, the relay and the memory are not shown in the figure. Each button corresponds to a kind of shrapnel. For example, button one corresponds to shrapnel one. In the memory, the distance between the lower pressing plate 6 and the distance sensor 11 is d1, and the memory stores the position of the lower pressing plate 6 corresponding to each kind of shrapnel. When detecting shrapnel one, press button one. When the distance between the lower pressing plate 6 and the distance sensor 11 is d1, the distance sensor 11 feeds back to the control module, and the control module controls the relay according to the information in the memory to make the alarm lamp 12 energized and display green. The green color of the alarm lamp 12 indicates that the position of the lower pressing plate 6 is correct. When the lower pressing plate 6 moves to other positions, the alarm lamp 12 does not light up. The principle of the other buttons corresponding to the shrapnel is the same. The distance sensor 11, the alarm lamp 12, the control module, the control panel and the memory etc. equipped on the support frame 2 enable different operators to quickly and accurately complete the test preparation work. Even when facing complex and diverse shrapnel products, it can ensure the consistency and accuracy of the test conditions, and improve the overall test quality and efficiency.

[0049] For the connection between the connecting cap 31 and the connecting seat 32, first move the connecting cap 31 horizontally so that the threaded cylinder 311 enters the slot 321. At this time, the upper auxiliary plate 81 is located above the upper ball 85, and the lower auxiliary plate 81 is located below the lower ball 85. Then, rotate the bidirectional screw 875. The bidirectional screw 875 causes the two support plates 871 to approach each other. The two support plates 871 cause the extension plate 831 to rise. The extension plate 831 drives the upper arc plate 83 to rise. The upper arc plate 83 drives the rod body 861 to rise, and the first spring 863 is compressed. The ball 85 on the upper arc plate 83 contacts the rolling groove 82. At the same time, the ball 85 on the lower arc plate 84 contacts the rolling groove 82. After the upper surface of the support plate 871 contacts the lower surface of the upper arc plate 83, the support plate 871 continues to move, and then the side plate 873 and the protruding plate 874 can move to the lower side of the upper arc plate 83 and contact the upper arc plate 83.

[0050] When it is necessary to raise the lower pressing plate 6 to adapt to different elastic pieces, in order to reduce the resistance of the lower pressing plate 6 rising, press the pressing plate 95 to make the lifting plate 93 descend, and the second spring 94 is compressed. Then, move the lifting frame 91 so that the lifting plate 93 moves to the lower side of the extension part 323 of the connecting seat 32. Release the pressing plate 95 so that the lifting contacts the lower surface of the extension part 323. Then, rotate the fastening nut 33 to make the fastening nut 33 rise. Then, rotate the first limiting part 312. The first limiting part 312 drives the auxiliary plate 81, the threaded cylinder 311 and the second limiting part 313 to rotate together. By rotating the first limiting part 312 to rise, the connecting seat 32 is driven to rise. The connecting seat 32 drives the lower pressing plate 6 to rise, so as to adjust the height of the lower pressing plate 6. Then, rotate the fastening nut 33 again to fasten the threaded cylinder 311. During the rising process of the connecting seat 32, the second spring 94 exerts an upward force on the connecting seat 32 through the lifting plate 93, thereby reducing the resistance of the lower pressing plate 6 rising.

[0051] When it is necessary to lower the lower pressing plate 6 to adapt to different elastic pieces, the auxiliary lifting component 9 does not need to move. Directly rotate the first limiting part 312. The first limiting part 312 drives the auxiliary plate 81, the threaded cylinder 311 and the second limiting part 313 to rotate together. By rotating the first limiting part 312 to descend, the connecting seat 32 is driven to descend. The connecting seat 32 drives the lower pressing plate 6 to descend, so as to adjust the height of the lower pressing plate 6. Then, rotate the fastening nut 33 to descend and fasten the threaded cylinder 311 again.

[0052] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the above principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. An automotive sunroof spring durability test bench, characterized in that, Comprising: A workbench (1) provided with a product fixture (4) thereon; A support frame (2) installed on the workbench (1), a cylinder (5) installed on the support frame (2), a lower pressing plate (6) provided on the lower side of the extending rod of the cylinder (5), and a threaded section at the end of the extending rod of the cylinder (5); A floating joint (3) for connecting the lower pressing plate (6) and the extending rod of the cylinder (5), the floating joint (3) including a connecting cap (31) and a connecting seat (32) fixedly installed on the lower pressing plate (6), the connecting cap (31) being horizontally moved and inserted into the connecting seat (32), the connecting cap (31) and the connecting seat (32) being fixed longitudinally, the connecting cap (31) being threadedly connected to the extending rod of the cylinder (5), and a fastening nut (33) provided on the upper side of the connecting cap (31).

2. The durability test bench for the elastic piece of an automobile sunroof according to claim 1, wherein: The connecting cap (31) includes a threaded cylinder (311) and a first limiting portion (312) and a second limiting portion (313) fixed at the upper and lower ends of the threaded cylinder (311), a through slot (321) penetrating up and down is formed on the connecting seat (32), a limiting groove (322) recessed upward is formed on the lower surface of the connecting seat (32), the limiting groove (322) communicates with the slot (321), and the second limiting portion (313) is inserted into the limiting groove (322).

3. A durability test bench for automotive sunroof elastic pieces according to claim 2, characterized in that: An auxiliary device (8) is provided on the upper side of the lower pressing plate (6), the auxiliary device (8) includes auxiliary plates (81) fixedly connected to the opposite surfaces of the first limiting portion (312) and the second limiting portion (313), rolling grooves (82) are formed on the opposite surfaces of the two auxiliary plates (81), an upper arc plate (83) and a lower arc plate (84) are provided on the connecting seat (32), a plurality of arc-distributed balls (85) are installed on both the upper arc plate (83) and the lower arc plate (84), and the upper sides of the balls (85) are located in the rolling grooves (82).

4. The durability test bench for the elastic piece of an automobile sunroof according to claim 3, characterized in that: The upper arc plate (83) is connected to the connecting seat (32) through an elastic member (86), the lower arc plate (84) is fixedly connected to the connecting seat (32), the elastic member (86) includes a rod body (861) fixedly connected to the upper arc plate (83) at the upper end, an elastic groove is formed on the connecting seat (32), the rod body (861) is inserted into the elastic groove, a plate body (862) is fixed at the lower end of the rod body (861), a first spring (863) is sleeved on the rod body (861), and the two ends of the first spring (863) are respectively connected to the top wall of the elastic groove and the plate body (862).

5. The durability test bench for the elastic piece of an automobile sunroof according to claim 4, characterized in that: The moving distance of the upper arc plate (83) is greater than the sum of the protruding distances of the upper-side balls (85) and the lower-side balls (85).

6. The durability test bench for the elastic piece of an automobile sunroof according to claim 5, wherein: A support member (87) is provided on the connection seat (32). The support member (87) includes symmetric support plates (871). The upper surfaces of the two support plates (871) are in contact with the lower surface of the upper arc plate (83), the lower surfaces of the two support plates (871) are in contact with the connection seat (32), inclined guide surfaces one (872) are provided at the opposite ends of the two supports, symmetric extension plates (831) are fixedly connected to the upper arc plate (83), and inclined guide surfaces two (832) are provided on the lower surfaces of the extension plates (831).

7. An automotive sunroof shrapnel durability test bench according to claim 6, characterized in that: A side plate (873) is fixedly connected to one side of the support plate (871), and a plurality of spaced protrusion plates (874) extend from the side plate (873).

8. The durability test bench for the elastic piece of an automobile sunroof according to claim 7, characterized in that: The support member (87) further includes a bidirectional screw (875) rotatably connected to the connection seat (32), and the support plate (871) is threadedly connected to the bidirectional screw (875).

9. The durability test bench for the elastic piece of an automobile sunroof according to claim 1, wherein: A movable auxiliary lifting member (9) is provided on the support frame (2). The auxiliary lifting member (9) includes a lifting frame (91). The lifting frame (91) is slidably connected to the support frame (2). A fixed rod (92) is fixedly connected to the lifting frame (91). A lifting plate (93) is slidably connected to the fixed rod (92). A second spring (94) is sleeved on the fixed rod (92). The two ends of the second spring (94) are respectively connected to the lifting plate (93) and the lifting frame (91). An extension portion (323) is provided on one side of the connection seat (32).

10. A durability test bench for automotive sunroof shrapnel according to claim 9, characterized in that: A pressing plate (95) is fixedly connected to one side of the lifting plate (93).

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