Device for detecting bending strength of automobile parts

Abstract

The invention discloses an automobile part anti-bending strength detection device, and particularly relates to the technical field of detection devices, the automobile part anti-bending strength detection device comprises a detection base, a detection seat, a lifting unit, a connecting column, a floating column and a limiting unit; the detection pressing block is fixedly connected to the lower end of the floating column and is positioned right above the detection seat; and the trigger unit is arranged on the detection seat, is positioned below the detection pressing block, and is matched with the limiting unit, so that the floating column freely slides in the connecting column. Through the arrangement of the trigger unit and the limiting unit, when the pressure of the pressing block on the automobile part is detected to be too large, and the downward bending angle of the automobile part is increased, the trigger unit triggers the limiting unit to act, so that the locking and limiting effect of the limiting unit on the floating column disappears, and then the floating column can freely slide in the connecting column; in this way, the extrusion force of the detection pressing block on the automobile part disappears rapidly, and the automobile part is prevented from being broken due to the too large bending angle.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and more specifically, to a device for detecting the bending strength of automobile parts. Background Art

[0002] A car is a complex electromechanical hybrid system composed of tens of thousands of parts. There are many types of parts, but each has its own function and plays its own unique role in the overall car. Usually, auto parts manufacturers need to test the parts after the products are produced to ensure the reliability of product quality. Auto manufacturers also need to test the matching performance of the parts after they are installed in the whole vehicle. Auto parts are mainly composed of eight parts: automotive steering system parts, automotive running system parts, automotive electrical instrument system parts, automotive lamps, automotive modification parts, engine parts, transmission system parts, and brake system parts. The automotive parts testing project mainly consists of two parts: metal material parts testing project and polymer material parts testing project. The main testing project of automotive metal material parts includes bending strength testing.

[0003] In the existing bending strength test of automobile parts, the hydraulic rod drives the pressure block to move and squeeze the parts. The piston rod of the hydraulic rod is extended to a fixed stroke, and then the parts are observed to see if they are bent. Since the materials of some parts are brittle, the parts will break when the bending angle is large. The splashing of broken parts may pose a safety hazard to personnel. In addition, it is not convenient for staff to recycle the broken parts for further testing of other parameters.

[0004] Therefore, in order to solve the above problems, a device for detecting the bending strength of automobile parts is proposed. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a device for testing the bending strength of automobile parts. The technical problem to be solved by the present invention is that when the bending strength testing device in the prior art is used to test automobile parts, the materials of the automobile parts are relatively brittle and easily break, resulting in the splashing of broken parts, thereby creating a safety hazard and making it inconvenient to recycle and test.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for testing the bending strength of automobile parts, comprising a testing base and a testing seat fixed to the top surface of the testing base, and further comprising:

[0008] A lifting unit is arranged on the detection base, the lifting unit is drivingly connected to a connecting column, and the connecting column is driven by the lifting unit to move vertically;

[0009] A floating column coaxially penetrates the bottom of the connecting column, the floating column slides freely in the connecting column, and a limiting unit for limiting the vertical movement of the floating column is provided on the connecting column;

[0010] A detection pressing block fixedly connected to the lower end of the floating column, wherein the detection pressing block is located directly above the detection seat;

[0011] A trigger unit is arranged on the detection seat, the trigger unit is located below the detection pressing block, and the trigger unit cooperates with the limiting unit to enable the floating column to slide freely in the connecting column.

[0012] Furthermore, a plurality of rollers are horizontally rotatably connected in rows on both sides of the top of the detection seat.

[0013] Furthermore, the lifting unit includes mounting columns vertically fixed to both sides of the top of the detection base, the upper ends of the two mounting columns are commonly fixed with a top plate, a lifting cylinder is vertically installed on the top of the top plate, and the piston rod of the lifting cylinder is connected to the connecting column.

[0014] Furthermore, the limiting unit includes a protrusion fixed to the outer wall of the connecting column, a locking rod is horizontally passed through the protrusion, the locking rod slides freely on the protrusion, an annular groove is coaxially opened on the periphery of the floating column, and one end of the locking rod passes through the connecting column and is inserted into the annular groove.

[0015] Furthermore, a limit pin is fixedly connected to the upper end of the floating column, and a waist-shaped hole for the limit pin to be inserted into is provided at the periphery of the connecting column, and the limit pin can slide vertically and freely in the waist-shaped hole.

[0016] The cam is connected with a push rod at the top of the fixing seat, and the push rod slides freely on the fixing seat, and a strip plate is fixedly connected to the upper end of the lifting rod in the horizontal direction, and a piston is fixedly connected with the lower end of the lifting rod, and the piston slides freely in the fixing seat, and the interior of the fixing seat is divided into an upper connecting cavity and a lower connecting cavity from top to bottom in sequence, and an air outlet and an air inlet are arranged on the outer wall of the fixing seat in sequence from top to bottom, and a connecting portion is fixedly connected to the end of the protrusion away from the connecting column, and the interior of the connecting portion is hollow and connected with the protrusion, and an air pipe is installed on the top of the connecting portion, and one end of the air pipe away from the connecting portion is connected to the air outlet, so that the air outlet is connected with the interior of the connecting portion, and a sealing component is provided in the fixing seat, and the sealing component is used to connect the upper connecting cavity and the lower connecting cavity, and a driving component is provided in the connecting portion, and the driving component is used to drive the locking rod to move in a direction away from the annular groove.

[0017] Further, the sealing assembly includes a fixing plug coaxially fixed in the fixing seat, the lower end face of the fixing plug abuts against the upper end face of the piston, the end face of the fixing plug is coaxially provided with a through hole for the free passage of the lifting rod, the end face of the fixing plug is provided with a plurality of first connecting grooves, the end face of the piston is provided with a second connecting groove, the first connecting grooves and the second connecting grooves are staggered, and a return spring is vertically installed in the fixing seat, and the two ends of the return spring in the direction of elastic force elastically abut against the upper end face of the piston and the inner bottom wall of the fixing seat respectively and one by one.

[0018] Furthermore, the driving assembly includes a floating plug coaxially engaged with the inner cavity of the connecting part, the floating plug slides freely in the inner cavity of the connecting part, a clearance groove is provided on the periphery of the floating plug for the locking rod to pass freely, a sliding pin is fixed to the end of the locking rod, a sliding groove is provided on the periphery of the floating plug for the sliding pin to be inserted, the length direction of the longitudinal cross-sectional profile of the sliding groove forms an angle with the axial direction of the floating plug, a driving spring is vertically installed in the inner cavity of the connecting part, and the driving spring elastically presses the floating plug upward.

[0019] Furthermore, a mounting plate is connected to the side wall of the detection seat, a cylinder is horizontally mounted on the side wall of the mounting plate, and a push plate is connected to the end of the cylinder rod of the cylinder.

[0020] Furthermore, an installation groove is provided at the upper end of the floating column, a water bag column is installed in the installation groove, a connecting hole is provided in the floating column, a connecting cavity in the form of a through hole is provided at the bottom of the detection pressure block, the connecting hole and the connecting cavity are connected, and the water outlet of the water bag column is connected to the connecting hole.

[0021] Technical effects and advantages of the present invention:

[0022] 1. By setting the trigger unit and the limit unit, when the pressure of the detection pressure block on the automobile parts is too large, causing the angle of the automobile parts to bend downward to increase, the trigger unit will trigger the limit unit to act, so that the locking and limiting effect of the limit unit on the floating column disappears, and then the floating column can slide freely in the connecting column, so that the squeezing force of the detection pressure block on the automobile parts disappears quickly, avoiding the automobile parts from breaking due to excessive bending angle;

[0023] 2. By setting a cylinder to drive the push plate to move in the direction of the floating column, the automobile parts are pushed to move on the detection seat, so that other parts of the automobile parts can be detected to improve the detection accuracy. In addition, by setting a water bag column, a marking liquid is stored in the water bag column. When the floating column moves upward in the connecting column, the water bag column will be squeezed by the inner wall of the connecting column, so that the marking liquid in the water bag column enters the connecting hole from the water outlet of the water bag column, and enters the connecting cavity from the connecting hole, and then sprays onto the surface of the detection position of the automobile parts, so as to mark the detection position of the automobile parts, which is convenient for the staff to conduct in-depth detection and analysis of automobile parts whose anti-bending strength does not meet the standard in the future;

[0024] 3. The automobile parts are bent and deformed downward, thereby generating a downward thrust on the strip plate, so that the strip plate drives the lifting rod to move downward, thereby making the fixed plug and the piston end faces out of the state of abutting each other, and the second connecting groove of the fixed plug and the first connecting groove of the piston are in a connected state, so that the compressed air enters the upper connecting cavity from the lower connecting cavity, and then enters the connecting part from the air pipe, and generates a downward thrust on the floating plug, thereby making the sliding pin slide in the sliding groove, and can drive the locking rod to move away from the floating column, thereby making the end of the locking rod out of the state of being inserted in the annular groove, so that the floating column can slide freely up and down in the connecting column, thereby avoiding the detection pressure block from exerting pressure on the surface of the automobile parts and preventing the bending amplitude of the automobile parts from increasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a device for testing the bending strength of automobile parts in the present invention;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure from a side view angle;

[0027] Figure 3 for Figure 2 A schematic cross-sectional view of the middle structure;

[0028] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point A;

[0029] Figure 5 for Figure 3 A magnified schematic diagram of the local structure at B in the middle;

[0030] Figure 6 It is a schematic cross-sectional view of the structure after the fixing seat, the piston and the fixing plug are assembled in the present invention;

[0031] Figure 7 It is a schematic diagram of the structure after the floating column, the connecting column and the detection pressing block are assembled in the present invention;

[0032] Figure 8 for Figure 7 Schematic diagram of the cross-section of the middle structure.

[0033] The accompanying drawings are marked as follows: 1. mounting column; 2. detection base; 3. detection seat; 4. strip plate; 5. roller; 6. push plate; 7. cylinder; 8. air pipe; 9. connecting part; 10. mounting plate; 11. lifting cylinder; 12. connecting column; 13. floating column; 14. detection pressure block; 15. fixed seat; 16. lifting rod; 17. first connecting groove; 18. fixing plug; 19. piston; 20. reset spring; 21. lower connecting chamber; 22. air inlet; 23. air outlet; 24. upper connecting chamber; 25. waist-shaped hole; 26. limit pin; 27. annular groove; 28. locking rod; 29. ​​sliding pin; 30. driving spring; 31. sliding groove; 32. air avoidance groove; 33. floating plug; 34. water bag column; 35. connecting hole; 36. connecting chamber. DETAILED DESCRIPTION

[0034] 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.

[0035] like Figure 1-Figure 8 As shown, the present embodiment discloses: a device for testing the bending strength of automobile parts, comprising a testing base 2 and a testing base 3 fixed to the top surface of the testing base 2, a plurality of rollers 5 are connected in rows and rotatably horizontally on both sides of the top of the testing base 3, a notch is formed in the middle of the top of the testing base 3, mounting columns 1 are vertically welded on both sides of the top of the testing base 2, a top plate 10 is fixedly connected to the upper ends of the two mounting columns 1, a lifting cylinder 11 is vertically installed on the top of the top plate 10, and a piston rod of the lifting cylinder 11 is connected to a connecting column 12;

[0036] A floating column 13 is coaxially penetrated at the bottom of the connecting column 12, and the floating column 13 slides freely in the connecting column 12. A protrusion is fixedly connected to the outer wall of the connecting column 12, and a locking rod 28 is horizontally penetrated on the protrusion. The locking rod 28 slides freely on the protrusion. An annular groove 27 is coaxially opened on the periphery of the floating column 13. One end of the locking rod 28 penetrates into the connecting column 12 and is inserted into the annular groove 27. After the end of the locking rod 28 is inserted into the annular groove 27, The floating column 13 will be in a longitudinal limit state. A detection pressure block 14 is welded to the lower end of the floating column 13. The detection pressure block 14 is located directly above the detection seat 3. In addition, a limit pin 26 is fixed to the upper end of the floating column 13. A waist-shaped hole 25 for the limit pin 26 to be inserted is provided on the periphery of the connecting column 12. The limit pin 26 slides vertically and freely in the waist-shaped hole 25. The limit pin 26 slides in the waist-shaped hole 25, so that the floating column 13 will not be separated from the connecting column 12.

[0037] A fixed seat 15 is installed at the notch of the detection seat 3, and a lifting rod 16 is vertically penetrated on the top of the fixed seat 15. The lifting rod 16 slides freely on the fixed seat 15, and the upper end of the lifting rod 16 is horizontally fixed with a strip plate 4, and a piston 19 is fixed to the lower end of the lifting rod 16. The piston 19 slides freely in the fixed seat 15, and the interior of the fixed seat 15 is divided into an upper connecting chamber 24 and a lower connecting chamber 21 from top to bottom. The outer wall of the fixed seat 15 is provided with an air outlet 23 and an air inlet 22 from top to bottom, and the end of the protrusion away from the connecting column 12 is fixedly connected to a connecting portion 9, and the connecting portion 9 is hollow inside and connected to the protrusion. An air pipe 8 is installed on the top of the connecting portion 9, and the end of the air pipe 8 away from the connecting portion 9 is connected to the air outlet 23, so that the air outlet 23 is connected to the inside of the connecting portion 9, and the air inlet 22 is connected to an external compressed air pipeline through a pipeline, and the compressed air in the compressed air pipeline enters the lower connecting chamber 21 through the air inlet 22;

[0038] A fixed plug 18 is coaxially fixedly connected in the fixed seat 15, and the lower end surface of the fixed plug 18 is against the upper end surface of the piston 19. A through hole is coaxially opened on the end surface of the fixed plug 18 for the lifting rod 16 to pass freely. A plurality of first connecting grooves 17 are opened on the end surface of the fixed plug 18, and a second connecting groove is opened on the end surface of the piston 19. The first connecting groove 17 and the second connecting groove are staggered. A return spring 20 is vertically installed in the fixed seat 15, and the two ends of the return spring 20 in the elastic direction elastically press against the upper end surface of the piston 19 and the inner bottom wall of the fixed seat 15 respectively, and the return spring 20 generates a force on the piston 19. The upward elastic resisting force makes the upper end surface of the piston 19 and the lower end surface of the fixed plug 18 press against each other in the initial state, and the abutting surfaces are in a sealed state, so that the compressed air in the lower communicating chamber 21 cannot enter the upper communicating chamber 24. On the contrary, when the piston 19 moves downward, the upper end surface of the piston 19 is separated from the abutting state with the lower end surface of the fixed plug 18, so that the first communicating groove 17 and the second communicating groove can be connected, so that the compressed air in the lower communicating chamber 21 enters the upper communicating chamber 24 from the second communicating groove and the first communicating groove 17 in sequence, and enters the inside of the communicating portion 9 from the air pipe 8;

[0039] The inner cavity of the connecting portion 9 is coaxially engaged with a cylindrical floating plug 33, and the floating plug 33 slides freely in the inner cavity of the connecting portion 9. The floating plug 33 is provided with an escape groove 32 for the locking rod 28 to pass freely. A sliding pin 29 is fixedly connected to the end of the locking rod 28. The floating plug 33 is provided with a sliding groove 31 for the sliding pin 29 to be inserted into the outer cavity. The length direction of the longitudinal section profile of the sliding groove 31 forms an angle with the axial direction of the floating plug 33. A driving spring 30 is vertically installed in the inner cavity of the connecting portion 9. The driving spring 30 elastically presses the floating plug 33 upward. In the initial state, the driving spring 30 has an upward elastic pressing force on the floating plug 33, thereby causing the floating plug 33 to move upward, causing the sliding pin 29 to slide in the sliding groove 31, thereby driving the locking rod 28 to move toward the inner side of the floating column 13, so that the end of the locking rod 28 is inserted into the annular clamping groove 27, thereby limiting the downward movement of the floating column 13.

[0040] The side wall of the detection seat 3 is connected to a mounting plate, and a cylinder 7 is horizontally mounted on the side wall of the mounting plate. The end of the cylinder rod of the cylinder 7 is connected to a push plate 6. A mounting groove is provided at the upper end of the floating column 13, and a water sac column 34 is installed in the mounting groove. The water sac column 34 is filled with a marking liquid. The marking liquid has a certain pressure, so that the water sac column 34 is in a state of volume expansion. A connecting hole 35 is provided in the floating column 13, and a connecting cavity 36 in the form of a through hole is provided at the bottom of the detection pressure block 14, and the longitudinal section of the connecting cavity 36 is rectangular, the connecting hole 35 and the connecting cavity 36 are connected, and the water outlet of the water sac column 34 is connected with the connecting hole 35. When the end of the locking rod 28 is inserted into the annular groove 27, the water sac column 34 is The side outer wall abuts against the inner top wall of the connecting column 12, so that when the end of the locking rod 28 is out of the insertion state with the annular groove 27, the piston rod of the lifting cylinder 11 continues to extend, so that the floating column 13 and the automobile parts are relatively stationary, and the connecting column 12 moves downward relative to the automobile parts, so that the water bag column 34 will be subjected to the resistance force of the inner top wall of the connecting column 12, and the marking liquid in the water bag column 34 will flow into the connecting hole 35 from the water outlet of the water bag column 34, and enter the connecting cavity 36 from the connecting hole 35, and then spray from the mouth of the connecting cavity 36 to the surface of the detection position of the automobile parts. Subsequent staff can measure the bending angle of the automobile parts according to the marking position.

[0041] Working principle of the present invention:

[0042] Clamping: Place the automobile parts flat on the rollers 5 on both sides of the testing seat 3, and the rollers 5 support the automobile parts;

[0043] Detection: Start the lifting cylinder 11. The lifting cylinder 11 is controlled by an external control cabinet to extend the fixed stroke of its piston rod. During the extension of the piston rod of the lifting cylinder 11, the detection block 14 will approach the surface of the automobile parts and begin to squeeze the surface of the automobile parts. The length direction of the detection block 14 is perpendicular to the length direction of the automobile parts. When the detection block 14 squeezes the automobile parts, if the bending strength of the automobile parts does not meet the standard, the automobile parts will be bent downward, that is, the contact part of the automobile parts with the strip plate 4 will move downward. The strip plate 4 moves downward, which will drive the lifting rod 16 to move downward, so that the piston 19 can be driven to move downward relative to the fixed plug 18, so that the piston 19 and the fixed plug 18 are separated from the state of end surface abutment, so that the first connecting groove 17 and the second connecting groove can be connected, so that the compressed air in the lower connecting chamber 21 enters the upper connecting chamber 24 from the second connecting groove and the first connecting groove 17 in turn, and enters the inside of the connecting part 9 from the air pipe 8, and the compressed air will generate a downward thrust on the floating plug 33;

[0044] Protection: When the floating plug 33 is pushed downward by the compressed air, the floating plug 33 will move downward, so that the sliding pin 29 slides in the sliding groove 31, and slides from the lower side of the sliding groove 31 in the length direction to the upper side thereof, so that the locking rod 28 can be driven to move in the direction away from the floating column 13, so that the floating column 13 can slide freely in the connecting column 12. Since the lifting cylinder 11 is still moving downward at this time, and the floating column 13 is relatively stationary relative to the surface of the automobile parts, and the connecting column 12 is in a state of relative movement relative to the automobile parts, the water bag column 34 is squeezed by the top wall of the connecting column 12, so that the marking liquid in the water bag column 34 flows into the connecting hole 35 from the water outlet of the water bag column 34, and enters the connecting cavity 36 from the connecting hole 35, and then sprays from the mouth of the connecting cavity 36 to the surface of the detection position of the automobile parts. The subsequent staff can measure the bending angle of the automobile parts according to the marking position. According to the marking liquid, the staff can determine that the bending strength of the metal parts does not meet the standard;

[0045] Reset: The staff starts the lifting cylinder 11, the piston rod of the lifting cylinder 11 shortens, and drives the floating column 13 to move upward, and starts the cylinder 7 at the same time, the cylinder rod of the cylinder 7 extends, and then drives the push plate 6 to move, so that the push plate 6 pushes the metal parts to move on the roller 5, so that the other part of the metal parts faces the detection block 14. At this time, the pressure on the strip plate 4 disappears, so that the reset spring 20 pushes the piston 19 to move upward, so that the end face of the piston 19 and the end face of the fixed plug 18 are in a state of abutment, so that the pressure of the compressed air inside the upper connecting chamber 24 and the connecting part 9 is consistent, and at this time the floating When the compressed air pressure on the plug 33 disappears, the driving spring 30 will change from a compressed state to an extended state, and drive the floating plug 33 to move upward, thereby causing the sliding pin 29 to move in the opposite direction in the sliding groove 31 to the lower side of the sliding groove 31. At this time, due to the effect of gravity, the detection block 14 will drive the floating column 13 to slide downward. When the limit pin 26 slides to the lower side of the waist-shaped hole 25, the floating column 13 will not be able to continue to fall. At the same time, the annular groove 27 and the locking rod 28 are in a corresponding state, so that the end of the locking rod 28 slides toward the annular groove 27 and re-engages in the annular groove 27. Then;

[0046] Reposition detection: In order to accurately detect metal parts and prevent different bending strengths due to different detection positions, after the above steps are completed, the lifting cylinder 11 is restarted and other positions of the metal parts are detected.

[0047] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0048] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0049] Finally: The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the bending strength of automobile parts, comprising a testing base (2) and a testing seat (3) fixedly connected to the top surface of the testing base (2), characterized in that: Also includes: A lifting unit is arranged on the detection base (2), the lifting unit is drivingly connected to a connecting column (12), and the connecting column (12) is driven by the lifting unit to move vertically; a floating column (13) coaxially penetrated through the bottom of the connecting column (12), the floating column (13) freely sliding in the connecting column (12), and a limiting unit for limiting the vertical movement of the floating column (13) being provided on the connecting column (12); A detection pressing block (14) fixedly connected to the lower end of the floating column (13), wherein the detection pressing block (14) is located directly above the detection seat (3); A trigger unit is provided on the detection seat (3), the trigger unit is located below the detection pressing block (14), and the trigger unit cooperates with the limiting unit to enable the floating column (13) to slide freely in the connecting column (12).

2. The device for testing the bending strength of automobile parts according to claim 1, characterized in that: A plurality of rollers (5) are horizontally rotatably connected in rows on both sides of the top of the detection seat (3).

3. The device for testing the bending strength of automobile parts according to claim 1, characterized in that: The lifting unit comprises mounting columns (1) vertically fixed to both sides of the top of the detection base (2); the upper ends of the two mounting columns (1) are commonly fixed to a top plate (10); a lifting cylinder (11) is vertically installed on the top of the top plate (10); and the piston rod of the lifting cylinder (11) is connected to the connecting column (12).

4. The device for testing the bending strength of automobile parts according to claim 1, characterized in that: The limiting unit includes a protrusion fixed to the outer wall of the connecting column (12), a locking rod (28) is horizontally penetrated on the protrusion, and the locking rod (28) slides freely on the protrusion. The periphery of the floating column (13) is coaxially provided with an annular groove (27), and one end of the locking rod (28) penetrates into the connecting column (12) and is inserted into the annular groove (27).

5. The device for testing the bending strength of automobile parts according to claim 4, characterized in that: The upper end of the floating column (13) is fixedly connected to a limit pin (26), and the periphery of the connecting column (12) is provided with a waist-shaped hole (25) for the limit pin (26) to be inserted, and the limit pin (26) is vertically and freely slidable in the waist-shaped hole (25).

6. The device for testing the bending strength of automobile parts according to claim 5, characterized in that: The trigger unit comprises a fixed seat (15) mounted on the detection seat (3), a lifting rod (16) vertically penetrates the top of the fixed seat (15), the lifting rod (16) slides freely on the fixed seat (15), and the upper end of the lifting rod (16) is horizontally fixedly connected to a strip plate (4), and the lower end of the lifting rod (16) is fixedly connected to a piston (19), the piston (19) slides freely in the fixed seat (15), and the interior of the fixed seat (15) is divided into an upper connecting cavity (24) and a lower connecting cavity (21) from top to bottom, and the outer wall of the fixed seat (15) is provided with an air outlet (23) and an air inlet (22) from top to bottom, and the protrusion is far A connecting portion (9) is fixedly connected to one end away from the connecting column (12), the connecting portion (9) is hollow inside and is connected to the protruding portion, an air pipe (8) is installed on the top of the connecting portion (9), and the end of the air pipe (8) away from the connecting portion (9) is connected to the air outlet (23), so that the air outlet (23) is connected to the inside of the connecting portion (9), a sealing component is arranged in the fixing seat (15), and the sealing component is used to connect the upper connecting cavity (24) and the lower connecting cavity (21), and a driving component is arranged in the connecting portion (9), and the driving component is used to drive the locking rod (28) to move in a direction away from the annular groove (27).

7. The device for testing the bending strength of automobile parts according to claim 6, characterized in that: The sealing assembly comprises a fixed plug (18) coaxially fixed in the fixed seat (15), the lower end surface of the fixed plug (18) abuts against the upper end surface of the piston (19), the end surface of the fixed plug (18) is coaxially provided with a through hole for the free passage of the lifting rod (16), the end surface of the fixed plug (18) is provided with a plurality of first connecting grooves (17), the end surface of the piston (19) is provided with a second connecting groove, the first connecting grooves (17) and the second connecting grooves are staggered, and a return spring (20) is vertically installed in the fixed seat (15), and the two ends of the return spring (20) in the elastic force direction respectively elastically abut against the upper end surface of the piston (19) and the inner bottom wall of the fixed seat (15) in a one-to-one correspondence.

8. The device for testing the bending strength of automobile parts according to claim 7, characterized in that: The driving assembly includes a floating plug (33) coaxially engaged with the inner cavity of the connecting portion (9), the floating plug (33) slides freely in the inner cavity of the connecting portion (9), the periphery of the floating plug (33) is provided with a clearance groove (32) for the locking rod (28) to pass freely, the end of the locking rod (28) is fixedly connected with a sliding pin (29), the periphery of the floating plug (33) is provided with a sliding groove (31) for the sliding pin (29) to be inserted, the length direction of the longitudinal section profile of the sliding groove (31) forms an angle with the axial direction of the floating plug (33), and the inner cavity of the connecting portion (9) is vertically installed with a driving spring (30), and the driving spring (30) elastically presses the floating plug (33) upward.

9. The device for testing the bending strength of automobile parts according to claim 8, characterized in that: The side wall of the detection seat (3) is connected to a mounting plate, a cylinder (7) is horizontally mounted on the side wall of the mounting plate, and a push plate (6) is connected to the end of the cylinder rod of the cylinder (7).

10. The device for testing the bending strength of automobile parts according to claim 9, characterized in that: The upper end of the floating column (13) is provided with a mounting groove, a water bag column (34) is installed in the mounting groove, a connecting hole (35) is provided in the floating column (13), a connecting cavity (36) in the form of a through hole is provided at the bottom of the detection pressure block (14), the connecting hole (35) and the connecting cavity (36) are connected, and the water outlet of the water bag column (34) is connected with the connecting hole (35).

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