An anti-bending strength detection device for automotive parts

Abstract

The present invention discloses a detection device for the anti-bending strength of automotive parts, specifically relating to the technical field of detection devices, including a detection base, a detection seat, a lifting unit, a connecting column, a floating column, and a limiting unit; a detection pressing block fixedly connected to the lower end of the floating column, and the detection pressing block is located directly above the detection seat; a triggering unit arranged on the detection seat, the triggering unit is located below the detection pressing block, and the triggering unit cooperates with the limiting unit to enable the floating column to slide freely within the connecting column. By setting the triggering unit and the limiting unit, when the pressure of the detection pressing block on the automotive part is too large, causing the downward bending angle of the automotive part to increase, the triggering unit will trigger the limiting unit to act, causing the locking and limiting effect of the limiting unit on the floating column to disappear, and then enabling the floating column to slide freely within the connecting column. In this way, the extrusion force of the detection pressing block on the automotive part quickly disappears, avoiding the automotive part from breaking due to an excessive bending angle.

Description

Technical Field

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

[0002] An automobile is a complex electromechanical hybrid system composed of tens of thousands of parts. There are a wide variety of parts, each with its own function, playing a unique role in the whole automobile. Usually, after the products are produced by automobile part manufacturers, it is necessary to detect the parts to ensure the reliability of product quality. Automobile manufacturers also need to test the matching performance of the parts after they are installed in the whole vehicle. Automobile parts mainly consist of eight major parts, including automotive steering system parts, automotive running gear parts, automotive electrical and instrument system parts, automotive lamps, automotive modification parts, engine parts, powertrain parts, and braking system parts. The detection items of automobile parts mainly consist of two major parts: the detection items of metal material parts and the detection items of polymer material parts. The main detection items of automotive metal material parts include anti-bending strength detection.

[0003] When the existing anti-bending strength detection of automotive parts detects the anti-bending strength of parts, a hydraulic rod is used to drive a pressing block to move and squeeze the parts. The piston rod of the hydraulic rod extends to a fixed stroke, and then it is observed whether the parts are bent. Since the materials of some parts are brittle to a certain extent, when the bending angle is large, the parts will break, and the broken parts may fly and cause potential safety hazards to personnel. In addition, the broken parts are not convenient for the staff to recycle for further detection of other parameters.

[0004] Therefore, to solve the above problems, a detection device for the anti-bending strength of automotive 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 detection device for the anti-bending strength of automotive parts. The technical problem to be solved by the present invention is that when the existing anti-bending strength detection device detects automotive parts, the materials of the automotive parts are brittle, prone to breakage, resulting in the flying of the broken parts, thus causing potential safety hazards and being inconvenient for recycling and detection.

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

[0007] A detection device for the anti-bending strength of automotive parts, including a detection base and a detection seat fixedly connected to the top surface of the detection base, further including:

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

[0009] A floating column coaxially passing through the bottom of the connecting column, the floating column freely slides within the connecting column, and a limiting unit for restricting 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, the detection pressing block is located directly above the detection seat;

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

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

[0013] Further, the lifting unit includes mounting columns vertically and fixedly connected to both sides of the top of the detection base, a top plate is commonly fixedly connected to the upper ends of the two mounting columns, a lifting oil cylinder is vertically mounted on the top of the top plate, and the piston rod of the lifting oil cylinder is connected to the connecting column.

[0014] Further, the limiting unit includes a protruding portion fixedly connected to the outer wall of the connecting column, a locking rod is horizontally passed through the protruding portion, the locking rod freely slides on the protruding portion, an annular card slot is coaxially opened on the periphery of the floating column, and one end of the locking rod passing into the connecting column is inserted into the annular card slot.

[0015] Further, a limiting pin is fixedly connected to the upper end of the floating column, a kidney-shaped hole for inserting the limiting pin is opened on the periphery of the connecting column, and the limiting pin freely slides vertically in the kidney-shaped hole.

[0016] Further, the triggering unit includes a fixed seat installed on the detection seat. A lifting rod vertically penetrates through the top of the fixed seat. The lifting rod slides freely on the fixed seat. A strip-shaped plate is horizontally and fixedly connected to the upper end of the lifting rod. A piston is fixedly connected to the lower end of the lifting rod. The piston slides freely within the fixed seat and divides the interior of the fixed seat into an upper communication cavity and a lower communication cavity from top to bottom in sequence. An air outlet and an air inlet are sequentially arranged on the outer wall of the fixed seat from top to bottom. One end of the protruding portion away from the connecting column is fixedly connected to a communicating portion. The interior of the communicating portion is hollow and communicates with the protruding portion. A trachea is installed at the top of the communicating portion. One end of the trachea away from the communicating portion is connected to the air outlet, so that the air outlet communicates with the interior of the communicating portion. A sealing assembly is arranged within the fixed seat. The sealing assembly is used to connect the upper communication cavity and the lower communication cavity. A driving assembly is arranged within the communicating portion. The driving assembly is used to drive the locking rod to move away from the annular card slot.

[0017] Further, the sealing assembly includes a fixed plug coaxially and fixedly connected within the fixed seat. The lower end surface of the fixed plug abuts against the upper end surface of the piston. A through hole for the free passage of the lifting rod is coaxially formed on the end surface of the fixed plug. A plurality of first communication grooves are formed on the end surface of the fixed plug. A second communication groove is formed on the end surface of the piston. The first communication grooves and the second communication groove are arranged staggeredly. A return spring is vertically installed within the fixed seat. The two ends of the return spring in the direction of its elastic force respectively and elastically abut against the upper end surface of the piston and the inner bottom wall of the fixed seat in a one-to-one correspondence.

[0018] Further, the driving assembly includes a floating plug coaxially engaged within the inner cavity of the communicating portion. The floating plug slides freely within the inner cavity of the communicating portion. An avoidance groove for the free passage of the locking rod is formed on the periphery of the floating plug. A sliding pin is fixedly connected to the end of the locking rod. A sliding groove for the insertion of the sliding pin is formed on the periphery of the floating plug. The length direction of the cross-sectional contour of the sliding groove forms an angle with the axial direction of the floating plug. A driving spring is vertically installed within the inner cavity of the communicating portion. The driving spring elastically abuts against the floating plug upward.

[0019] Further, an installation plate is connected to the side wall of the detection seat. A cylinder is horizontally installed on the side wall of the installation plate. The end of the cylinder rod of the cylinder is connected to a push plate.

[0020] Further, an installation groove is formed at the upper end of the floating column. A water bag column is installed within the installation groove. A communication hole is formed within the floating column. A communication cavity in the form of a through hole is formed at the bottom of the detection pressing block. The communication hole and the communication cavity communicate with each other. The water outlet of the water bag column communicates with the communication hole.

[0021] The technical effects and advantages of the present invention:

[0022] 1. By setting a trigger unit and a limit unit, when the pressure of the detection press block on the automotive part is too large, causing the downward bending angle of the automotive part to increase, the trigger unit will trigger the limit unit to act, causing the locking and limiting effect of the limit unit on the floating column to disappear, and then enabling the floating column to slide freely within the connecting column. This enables the extrusion force of the detection press block on the automotive part to quickly disappear, preventing the automotive part from breaking due to excessive bending angle.

[0023] 2. By setting a cylinder to drive the push plate to move towards the floating column, the automotive part is pushed to move on the detection seat, enabling the detection of other parts of the automotive part to improve the detection accuracy. Additionally, by setting a water sac column with marking liquid stored inside, when the floating column moves upward within the connecting column, the water sac column will be squeezed by the inner wall of the connecting column. As a result, the marking liquid in the water sac column enters the communication hole from the water outlet of the water sac column, and then enters the communication cavity from the communication hole, and is sprayed onto the surface of the detection position of the automotive part, marking the detection position of the automotive part, which facilitates subsequent in-depth detection and analysis of automotive parts with insufficient anti-bending strength by the staff.

[0024] 3. After the automotive part bends and deforms downward, a downward thrust is generated on the strip plate, causing the strip plate to drive the lifting rod to move downward. As a result, the fixed plug and the piston end face are separated from the abutted state, and the second communication groove of the fixed plug and the first communication groove of the piston are in a communicating state. Compressed air enters the upper communication cavity from the lower communication cavity, then enters the communication part through the air pipe, and generates a downward thrust on the floating plug. As a result, the sliding pin slides within the sliding groove and can drive the locking rod to move away from the floating column, causing the end of the locking rod to disengage from the inserted state in the annular card slot. Thus, the floating column can slide freely up and down within the connecting column, preventing the detection press block from exerting pressure on the surface of the automotive part and preventing the bending amplitude of the automotive part from increasing. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of a device for detecting the anti-bending strength of an automotive part in the present invention;

[0026] Figure 2 is Figure 1 a schematic structural diagram from a side view angle;

[0027] Figure 3 is Figure 2 a cross-sectional schematic diagram of a partial structure in;

[0028] Figure 4 is Figure 3 an enlarged schematic diagram of a partial structure at A in;

[0029] Figure 5 isFigure 3 An enlarged schematic view of the local structure at position B in the figure;

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

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

[0032] Figure 8 is Figure 7 A schematic cross-sectional view of a part of the structure in the figure.

[0033] The reference numerals are: 1, mounting column; 2, detection base; 3, detection seat; 4, strip plate; 5, idler roller; 6, push plate; 7, cylinder; 8, air pipe; 9, communication part; 10, mounting plate; 11, lifting oil cylinder; 12, connecting column; 13, floating column; 14, detection pressing block; 15, fixed seat; 16, lifting rod; 17, first communication groove; 18, fixed plug; 19, piston; 20, return spring; 21, lower communication cavity; 22, air inlet; 23, air outlet; 24, upper communication cavity; 25, kidney-shaped hole; 26, limit pin; 27, annular clamping groove; 28, locking rod; 29, sliding pin; 30, driving spring; 31, sliding groove; 32, clearance groove; 33, floating plug; 34, water bag column; 35, communication hole; 36, communication cavity. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figures 1-8 shown, in this embodiment, the following is disclosed: a device for detecting the anti-bending strength of automotive parts, including a detection base 2 and a detection seat 3 fixedly connected to the top surface of the detection base 2. A plurality of idler rollers 5 are horizontally and rotatably connected in rows on both sides of the top of the detection seat 3. The middle position of the top of the detection seat 3 is in a notch shape. On both sides of the top of the detection base 2, mounting columns 1 are vertically welded respectively. The upper ends of the two mounting columns 1 are commonly fixedly connected to a top plate 10. A lifting oil cylinder 11 is vertically installed on the top of the top plate 10. The piston rod of the lifting oil cylinder 11 is connected to a connecting column 12;

[0036] A floating column 13 is coaxially penetrated through the bottom of the connecting column 12. The floating column 13 can slide freely within the connecting column 12. A protruding portion is fixedly connected to the outer wall of the connecting column 12. A locking rod 28 is horizontally penetrated through the protruding portion. The locking rod 28 can slide freely on the protruding portion. An annular card slot 27 is coaxially formed on the periphery of the floating column 13. One end of the locking rod 28 penetrating into the connecting column 12 is inserted into the annular card slot 27. After the end of the locking rod 28 is inserted into the annular card slot 27, the floating column 13 will be in a longitudinally limited state. A detection pressing block 14 is welded to the lower end of the floating column 13. The detection pressing block 14 is located directly above the detection seat 3. In addition, a limit pin 26 is fixedly connected to the upper end of the floating column 13. A kidney-shaped hole 25 for inserting the limit pin 26 is formed on the periphery of the connecting column 12. The limit pin 26 can slide vertically and freely within the kidney-shaped hole 25. The sliding of the limit pin 26 within the kidney-shaped hole 25 prevents the floating column 13 from detaching from the connecting column 12;

[0037] A fixed seat 15 is installed at the notch portion of the detection seat 3. A lifting rod 16 is vertically penetrated through the top of the fixed seat 15. The lifting rod 16 can slide freely on the fixed seat 15. The upper end of the lifting rod 16 is horizontally and fixedly connected with a strip-shaped plate 4. The lower end of the lifting rod 16 is fixedly connected with a piston 19. The piston 19 can slide freely within the fixed seat 15 and divides the interior of the fixed seat 15 into an upper communication cavity 24 and a lower communication cavity 21 from top to bottom in sequence. An air outlet 23 and an air inlet 22 are successively arranged on the outer wall of the fixed seat 15 from top to bottom. One end of the protruding portion far from the connecting column 12 is fixedly connected with a communication portion 9. The interior of the communication portion 9 is hollow and is connected to the protruding portion. A trachea 8 is installed at the top of the communication portion 9. One end of the trachea 8 far from the communication portion 9 is connected to the air outlet 23, so that the air outlet 23 is in communication with the interior of the communication portion 9. The air inlet 22 is connected to an external compressed air pipeline through a pipeline. Compressed air in the compressed air pipeline enters the lower communication cavity 21 through the air inlet 22;

[0038] A fixed plug 18 is fixedly connected coaxially inside the fixed seat 15. The lower end face of the fixed plug 18 abuts against the upper end face of the piston 19. A through hole for the free passage of the lifting rod 16 is coaxially formed in the end face of the fixed plug 18. A plurality of first communication grooves 17 are formed in the end face of the fixed plug 18. A second communication groove is formed in the end face of the piston 19. The first communication grooves 17 and the second communication groove are arranged staggeredly. A return spring 20 is vertically installed inside the fixed seat 15. The two ends of the return spring 20 in the elastic force direction respectively and correspondingly elastically abut against the upper end face of the piston 19 and the inner bottom wall inside the fixed seat 15. An upward elastic abutting force is generated on the piston 19 through the return spring 20. In the initial state, the upper end face of the piston 19 and the lower end face of the fixed plug 18 are mutually abutted tightly, and the abutting surface is in a sealed state. Furthermore, the compressed air in the lower communication cavity 21 cannot enter the upper communication cavity 24. On the contrary, when the piston 19 moves downward, the upper end face of the piston 19 is separated from the state of abutting against the lower end face of the fixed plug 18. Furthermore, the first communication grooves 17 and the second communication groove can be communicated. The compressed air in the lower communication cavity 21 sequentially enters the upper communication cavity 24 through the second communication groove and the first communication grooves 17, and enters the inside of the communication part 9 from the air pipe 8;

[0039] A cylindrical floating plug 33 is coaxially engaged inside the cavity of the communication part 9. The floating plug 33 slides freely inside the cavity of the communication part 9. An avoidance groove 32 for the free passage of the locking rod 28 is formed on the periphery of the floating plug 33. A sliding pin 29 is fixedly connected to the end of the locking rod 28. A sliding groove 31 for inserting the sliding pin 29 is formed on the periphery of the floating plug 33. The length direction of the longitudinal section contour of the sliding groove 31 forms an angle with the axial direction of the floating plug 33. A driving spring 30 is vertically installed inside the cavity of the communication part 9. The driving spring 30 elastically abuts against the floating plug 33 upward. In the initial state, the driving spring 30 has an upward elastic abutting force on the floating plug 33. Furthermore, the floating plug 33 moves upward, causing the sliding pin 29 to slide in the sliding groove 31. Furthermore, the locking rod 28 is driven to move towards the inner side direction of the floating column 13, causing the end of the locking rod 28 to be inserted into the annular card slot 27. Furthermore, the downward movement of the floating column 13 is limited;

[0040] The side wall of the detection base 3 is connected with a mounting plate, on the side wall of the mounting plate is horizontally installed a cylinder 7, the end of the cylinder rod of the cylinder 7 is connected with a push plate 6, an installation groove is opened at the upper end of the floating column 13, a water bag column 34 is installed in the installation groove, a marking liquid is filled in the water bag column 34, the marking liquid has a certain pressure, so that the water bag column 34 is in a state of volume expansion, a communication hole 35 is opened in the floating column 13, a communication cavity 36 in the form of a through hole is opened at the bottom of the detection pressing block 14, and the longitudinal section of the communication cavity 36 is rectangular, the communication hole 35 and the communication cavity 36 are penetrated, the water outlet of the water bag column 34 is penetrated with the communication hole 35, when the end of the locking rod 28 is inserted into the annular clamping groove 27, the outer wall of the upper side of the water bag column 34 abuts against the inner top wall of the connecting column 12, so when the end of the locking rod 28 is disengaged from the inserted state with the annular clamping groove 27, due to the piston rod of the lifting oil cylinder 11 continuing to extend, the floating column 13 is relatively stationary with respect to the automotive component, while the connecting column 12 moves downward relative to the automotive component, thereby causing the water bag column 34 to be subjected to the abutting force of the inner top wall of the connecting column 12, the marking liquid in the water bag column 34 will flow into the communication hole 35 from the water outlet of the water bag column 34, enter the communication cavity 36 from the communication hole 35, and then spray from the mouth of the communication cavity 36 onto the surface of the detection position of the automotive component, and subsequent staff can calculate the bending angle of the automotive component according to the marked position.

[0041] The working principle of the present invention:

[0042] Clamping: Place the automotive component flat on the idler rollers 5 on both sides of the detection base 3, and the idler rollers 5 support the automotive component;

[0043] Detection: Start the lifting oil cylinder 11, the lifting oil cylinder 11 is controlled by an external control cabinet to extend its piston rod by a fixed stroke. During the extension of the piston rod of the lifting oil cylinder 11, the detection pressing block 14 will approach the surface of the automotive component and start to squeeze the surface of the automotive component. The length direction of the detection pressing block 14 is perpendicular to the length direction of the automotive component. When the detection pressing block 14 squeezes the automotive component, if the anti-bending strength of the automotive component does not meet the standard, the automotive component will produce a downward bending deformation, that is, the part of the automotive component in contact 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, and then the piston 19 is disengaged from the state of abutting against the end face of the fixed plug 18, thereby enabling the first communication groove 17 and the second communication groove to communicate, so that the compressed air in the lower communication cavity 21 sequentially enters the upper communication cavity 24 from the second communication groove and the first communication groove 17, and enters the inside of the communication 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 compressed air, the floating plug 33 will move downward, causing the sliding pin 29 to slide within the sliding groove 31 and slide from the lower side to the upper side in the length direction of the sliding groove 31. This can drive the locking rod 28 to move away from the floating column 13, enabling the floating column 13 to slide freely within the connecting column 12. Since the lifting oil cylinder 11 still has a downward movement tendency at this time, and the floating column 13 is relatively stationary relative to the surface of the automotive component, while the connecting column 12 is in a relatively moving state relative to the automotive component, the water bag column 34 is squeezed by the inner top wall of the connecting column 12. As a result, the marking liquid in the water bag column 34 surges into the communication hole 35 from the water outlet of the water bag column 34, enters the communication cavity 36 through the communication hole 35, and then sprays from the mouth of the communication cavity 36 onto the surface of the automotive component detection position. Subsequently, the staff can measure the bending angle of the automotive component based on the marked position. According to the marking liquid, the staff can determine that the bending resistance strength of the metal component does not meet the standard;

[0045] Reset: The staff activates the lifting oil cylinder 11. The piston rod of the lifting oil cylinder 11 shortens and drives the floating column 13 to move upward. At the same time, the air cylinder 7 is activated, and the piston rod of the air cylinder 7 extends, driving the push plate 6 to move, so that the push plate 6 pushes the metal component to move on the roller 5, enabling another part of the metal component to face the detection pressure block 14. At this time, the pressure on the strip plate 4 disappears, causing the return spring 20 to push the piston 19 upward, making the end face of the piston 19 and the end face of the fixed plug 18 in contact. This makes the pressure of the compressed air inside the upper communication cavity 24 and the communication part 9 the same. And at this time, the compressed air pressure on the floating plug 33 disappears, and the driving spring 30 will change from the compressed state to the extended state and drive the floating plug 33 to move upward. As a result, the sliding pin 29 moves in the reverse direction within the sliding groove 31 to the lower side of the sliding groove 31. And at this time, due to the action of gravity, the detection pressure block 14 will drive the floating column 13 to slide downward. When the limit pin 26 slides to the lower side of the kidney-shaped hole 25, the floating column 13 will no longer be able to continue to fall. At the same time, the annular card slot 27 and the locking rod 28 are in a corresponding state, causing the end of the locking rod 28 to slide towards the annular card slot 27 and re-engage into the annular card slot 27. Subsequently;

[0046] Change position for detection: To accurately detect the metal component and prevent different bending strengths due to different detection positions, after the above steps are completed, the lifting oil cylinder 11 is restarted, and other positions of the metal component are detected.

[0047] The following points should be noted: First, in the description of this application, it should be noted that unless otherwise specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or can be the internal connection of two components, and can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0048] Second, in the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

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

Claims

1. 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, characterized in that: Also includes: A lifting unit is arranged on the detection base, the lifting unit is driven and connected with a connecting column, and the connecting column is driven by the lifting unit to move vertically; A floating column is coaxially arranged at the bottom of the connecting column, the floating column slides freely in the connecting column, and a limiting unit is provided on the connecting column for limiting the vertical movement of the floating column; A detection pressing block fixedly connected to the lower end of the floating column, the detection pressing block is located directly above the detection seat; 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 limit unit to make the floating column slide freely in the connecting column; The limiting unit includes a protrusion fixed to the outer wall of the connecting column, a locking rod is horizontally penetrated on 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 penetrates into the connecting column and is inserted into the annular groove; The trigger unit includes a fixed seat installed on the detection seat, a lifting rod is vertically penetrated on the top of the fixed seat, the lifting rod slides freely on the fixed seat, and a strip plate is horizontally fixed to the upper end of the lifting rod, and a piston is fixed to the lower end of the lifting rod. The piston slides freely in the fixed seat and divides the interior of the fixed seat into an upper connecting chamber and a lower connecting chamber from top to bottom. The outer wall of the fixed seat is provided with an air outlet and an air inlet from top to bottom, and a connecting part is fixed to one end of the protrusion away from the connecting column. The connecting part is hollow inside and connected to the protrusion, and an air pipe is installed on the top of the connecting part, and one end of the air pipe away from the connecting part is connected to the air outlet, so that the air outlet is connected to the inside of the connecting part, and a sealing assembly is provided in the fixed seat, and the sealing assembly is used to connect the upper connecting chamber and the lower connecting chamber, and a driving assembly is provided in the connecting part, and the driving assembly is used to drive the locking rod to move in a direction away from the annular groove.

2. The device for testing the bending strength of automobile parts according to claim 1, characterized in that: Both sides of the top of the detection seat are connected with a plurality of rollers in rows and rotatably horizontally.

3. The device for testing the bending strength of automobile parts according to claim 1, characterized in that: 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.

4. The device for testing the bending strength of automobile parts according to claim 1, characterized in that: The upper end of the floating column is fixedly connected with a limit pin, and the periphery of the connecting column is provided with a waist-shaped hole for the limit pin to be inserted, and the limit pin can slide vertically and freely in the waist-shaped hole.

5. The device for testing the bending strength of automobile parts according to claim 1, characterized in that: The sealing assembly includes a fixed plug coaxially fixed in the fixed seat, the lower end face of the fixed plug abuts against the upper end face of the piston, the end face of the fixed plug is coaxially provided with a through hole for the free passage of the lifting rod, the end face of the fixed 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 fixed 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 fixed seat respectively and correspondingly.

6. The device for testing the bending strength of automobile parts according to claim 5, characterized in that: The driving assembly includes a floating plug coaxially engaged with the inner cavity of the connecting part. The floating plug can slide 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.

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

8. The device for testing the bending strength of automobile parts according to claim 7, characterized in that: 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 with the connecting hole.

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