Automobile bolt performance testing device

Abstract

The invention relates to the technical field of bolt detection, and discloses an automobile bolt performance testing device which comprises a universal tensile testing machine and further comprises an upper clamp body clamped and positioned by an upper jaw, a connecting cylinder is arranged on the outer wall of the upper clamp body, a notch for placing a bolt is formed in the connecting cylinder, a lower clamp body is arranged on the inner wall of the connecting cylinder in a sliding mode, and the lower clamp body is connected with the universal tensile testing machine. A plurality of first shock absorbers are evenly arranged on the bottom face of the lower clamp body, the other ends of the first shock absorbers are jointly connected with a bearing seat clamped and positioned by the lower jaw, a plurality of second shock absorbers are evenly arranged on the bottom face of the lower jaw, and the other ends of the second shock absorbers are jointly connected with a supporting seat. Telescopic rods are arranged at the four corners between the bottom face of the supporting seat and the top face of the base correspondingly, and a fixing assembly for synchronously positioning the four telescopic rods is further arranged on the base. According to the bolt stretching detection device, the axial stress during bolt stretching detection can be guaranteed, the impact force during stretching can be effectively buffered, and therefore the use quality requirement of the device is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt testing, in particular to a bolt performance testing device for automobiles. Background Art

[0002] Removable connections between automotive parts are usually achieved by bolting. To ensure production quality, bolts are generally inspected and subjected to a series of tensile strength tests during the bolt production process. Bolt tensile strength testing is an important test for evaluating bolt quality and performance. It mainly measures the tensile properties of bolts under tension, thereby evaluating the reliability and safety of bolts and ensuring that they can withstand the corresponding tensile loads without failure in actual applications.

[0003] When a bolt is subjected to a tensile strength test, it is usually performed on a universal tensile testing machine. During operation, the upper clamp and the lower clamp are first fixedly connected to the upper jaw and the lower jaw of the universal tensile testing machine respectively. Then the blocking pad is passed through the bolt to be tested and the blocking pad is abutted against the head of the bolt. The threaded end of the tail is then threadedly connected to the tension ring. Then the blocking pad and the tension ring are placed in the upper clamp and the lower clamp respectively. Finally, the rotation of the ball screw is controlled to drive the lifting seat to slide downward, and then the lower jaw on the lifting seat is driven downward to slide downward. At the same time, the lower clamp and the tension ring are driven downward to perform a tensile test on the bolt until the bolt breaks. The maximum tensile strength that the bolt can withstand is then obtained and displayed on the monitor through signal transmission technology.

[0004] During the above operation, a large impact force will be generated at the lower jaw at the moment the bolt is broken, which will have a large impact on the fitting of the lifting seat and the ball screw, affecting the smoothness of the lifting seat sliding control during long-term use. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above difficulties and provide a device for testing the performance of automobile bolts.

[0006] To solve the above technical problems, the present invention provides a technical solution: a device for testing the performance of automotive bolts, comprising a universal tensile testing machine, the universal tensile testing machine comprising a base, a support column, an upper jaw, a ball screw, a lifting seat, and a lower jaw, wherein the rotation of the ball screw drives the lifting seat to slide up and down, and the lower jaw is connected to the lifting seat and is controlled by the up and down sliding of the adjustment seat; It also includes an upper clamping body clamped and positioned by the upper jaw, a connecting cylinder is provided on the outer wall of the upper clamping body, a lower clamping body is slidably provided on the inner wall of the connecting cylinder, and the upper clamping body, the connecting cylinder and the lower clamping body are on the same axis, a plurality of shock absorbers are evenly provided on the bottom surface of the lower clamping body, the other ends of the plurality of shock absorbers are commonly connected to a bearing seat clamped and positioned by the lower jaw, and a guide rod is fixedly provided on the bearing seat to slide with the lower clamping body, and a limit seat is provided on the top surface of the guide rod; A plurality of shock absorbers 2 are evenly arranged on the bottom surface of the lower jaw, and the other ends of the plurality of shock absorbers 2 are commonly connected to a support seat. Telescopic rods are respectively provided at the four corners between the bottom surface of the support seat and the top surface of the base. A fixing assembly for synchronously positioning the four telescopic rods is also provided on the base. A linkage assembly is provided between the adjustment seat and the fixing assembly. When the adjustment seat slides upward to drive the lower jaw to clamp and position the bearing seat, the linkage assembly is driven to move and then the fixing assembly is driven to move to position the four telescopic rods.

[0007] As an improvement, the telescopic rod includes a cylinder fixed on the base and a movable rod sliding in the cylinder, the top surface of the movable rod is fixedly connected to the support seat, the fixing assembly includes a fixing seat arranged on the cylinder, and the fixing seats are respectively provided with positioning pins with a rebound function, and the movable rod is provided with a pin hole for the positioning pin to extend into, and the base is provided with an adjustment assembly for synchronously controlling the four positioning pins.

[0008] As an improvement, a bidirectional screw rod for controlling the movement of the adjustment assembly is rotatably provided on the base, the linkage assembly includes a small gear arranged on the bidirectional screw rod, a large gear engaged with the small gear is rotatably provided on the base, and a toothed plate engaged with the large gear is also slidably provided, a connecting rod is provided on the toothed plate, an adjusting cylinder fixedly connected to the adjustment seat is slidably provided on the connecting rod, and an adjustment assembly for positioning the adjusting cylinder and the connecting rod is provided on the support seat.

[0009] As an improvement, the adjustment assembly includes sliding rods respectively connected to the outer end faces of the positioning pins and slidingly engaged with the base, and the base is slidingly provided with wedge blocks that slide relative to or opposite to each other. The two sliding rods at the same end are respectively provided with matching blocks adapted to the wedge blocks at the opposite ends, and the two ends of the bidirectional screw rod are threaded with sliding seats that slide with the base, and the two wedge blocks are respectively fixedly connected to the corresponding sliding seats.

[0010] As an improvement, the adjustment assembly includes a mounting seat arranged on the adjusting cylinder, a movable pin is slidably inserted into the mounting seat, two pin holes are opened on the connecting rod for the movable pin to extend into, a movable seat is provided on the outer end surface of the movable pin and a slider is slidably provided in the movable seat, a connecting frame is provided on the support seat, an electric push rod is provided on the inner wall of the connecting frame, and the movable end of the electric push rod is connected to the slider.

[0011] As an improvement, the connecting tube is provided with a slot for placing a bolt, a protective door is slidably provided on the connecting tube for opening and closing the slot, and an arc-shaped guide rail is also provided for the sliding of the protective door.

[0012] As an improvement, there are two protective doors that cooperate with each other to open and close the slots, and a lock is provided between the two protective doors.

[0013] The beneficial effects of the present invention compared with the prior art are: 1. With the cooperation of the lower clamping body, shock absorber 1, bearing seat, guide rod and limit seat, as well as the cooperation of shock absorber 2, support seat, telescopic rod and fixing assembly, an elastic connection can be formed between the lower clamping body and bearing seat, as well as between the lower jaw and the base. When the lower jaw moves downward and breaks the bolt, the large impact force generated at this time will be distributed to the lower clamping body and the lower jaw. At this time, the impact force can be effectively buffered by the cooperation of shock absorber 1 and shock absorber 2, thereby avoiding the impact force on the joint between the lifting seat and the ball screw, ensuring its quality requirements for use; 2. Under the sliding cooperation of the upper clamping body, the connecting tube and the lower clamping body, the pre-installed blocking pad and the tension ring can be connected between the upper clamping body and the lower clamping body, and then the upper clamping body is fixedly connected to the upper jaw. The downward sliding position of the lower clamping body is limited by the blocking of the tension ring, and then the lower jaw is controlled to slide upward to fix the bearing seat. In this way, the verticality requirement of the bolt can be guaranteed by its own gravity, thereby ensuring the axial force of the bolt under test during the tensile test; 3. Under the action of the linkage component and the fixed component, when the lower jaw is clamped and positioned on the bearing seat, the linkage component is driven to move, and then the fixed component is driven to move to perform synchronous positioning operations on the four telescopic rods, thereby improving the operation convenience of the device; 4. With the cooperation of the bidirectional screw, sliding seat, wedge block, matching block, sliding rod and positioning pin, the four telescopic rods can be positioned synchronously, thereby improving the convenience of the device in positioning the telescopic rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0016] Figure 3 It is a structural schematic diagram of the cooperation among the upper clamping body, the connecting tube and the lower clamping body in the present invention.

[0017] Figure 4 It is a schematic diagram of the internal structure of the upper clamping body, the connecting tube and the lower clamping body in the present invention.

[0018] Figure 5 It is a partial structural schematic diagram of the present invention.

[0019] Figure 6 It is a partial structural schematic diagram of the present invention.

[0020] Figure 7 This invention Figure 6 Enlarged view of point A in the middle.

[0021] Figure 8 It is a structural schematic diagram of the adjustment component in the present invention.

[0022] As shown in the figure: 1. Universal tensile testing machine; 111. Base; 112. Support column; 113. Upper jaw; 114. Ball screw; 115. Lifting seat; 116. Lower jaw; 117. Adjusting seat; 211. Upper clamping body; 212. Connecting cylinder; 213. Notch; 214. Lower clamping body; 215. Shock absorber 1; 216. Bearing seat; 217. Guide rod; 218. Limiting seat; 311. Shock absorber 2; 312. Support seat; 313. Telescopic rod; 3131. Cylinder; 3132. Moving rod; 4. Fixing assembly ;411, fixed seat;412, positioning pin;5, linkage assembly;511, small gear;512, large gear;513, tooth plate;514, connecting rod;515, adjusting cylinder;6, adjusting assembly;611, sliding rod;612, wedge block;613, matching block;711, bidirectional screw rod;712, sliding seat;8, adjustment assembly;811, mounting seat;812, moving pin;813, moving seat;814, slider;815, connecting frame;816, electric push rod;9, blocking pad;10, bolt to be measured;11, tension ring. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] Combined with attachment Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4As shown, a bolt performance testing device for automobiles includes a universal tensile testing machine 1, which is composed of a base 111, a support column 112, an upper jaw 113, a ball screw 114, a lifting seat 115 and a lower jaw 116. The rotation of the ball screw 114 drives the lifting seat 115 to slide up and down. The lower jaw 116 is connected to the lifting seat 115 and is controlled by the up and down sliding of the internal adjustment seat 117 in conjunction with the wedge structure to control the closing and opening of the lower jaw 116. The up and down sliding of the adjustment seat 117 is controlled by the extension and contraction of the electric cylinder. When the bolt 10 to be tested is subjected to a tensile test, the downward sliding of the lifting seat 115 and the lower jaw 116 is controlled. After the bolt 10 to be tested is broken, its maximum tensile value is displayed on a display through signal transmission technology. The above features belong to the prior art. The main improvement of the present application is that a special buffer mechanism is designed to deal with the instantaneous impact force generated by the bolt 10 to be tested when it is tensile broken. The upper clamp body 211 is clamped and positioned by the upper jaw 113. A groove for placing the blocking pad 9 is provided at the center position of the upper clamp body 211. A connecting tube 212 is provided on the outer wall of the upper clamp body 211, and a notch 213 for placing a bolt is provided on the connecting tube 212. A lower clamp body 214 is slidably provided on the inner wall of the connecting tube 212. The upper clamp body 211, the connecting tube 212 and the lower clamp body 214 are on the same axis. A plurality of shock absorbers 215 are evenly provided on the bottom surface of the lower clamp body 214. The shock absorber 215 is a damping shock absorber in the prior art. A return spring 1 is sleeved on the outer side of the shock absorber 215. There are four shock absorbers 215 in number and they are equidistantly distributed along the circumferential direction of the lower clamping body 214. The other ends of the four shock absorbers 215 are commonly connected to a bearing seat 216 clamped and positioned by the lower jaw 116. In order to drive the lower clamping body 214 to slide downward synchronously during the downward sliding of the positioned bearing seat 216, a guide rod 217 that slides with the lower clamping body 214 is fixed on the bearing seat 216. The top surface of the guide rod 217 is provided with a limit seat 218 that abuts against the bottom wall of the lower clamping body 214. The bottom surface of the lower jaw 116 is evenly fixed with a plurality of shock absorbers 2 311, and the other ends of the plurality of shock absorbers 2 311 are commonly connected to a support seat 312. The number of the plurality of shock absorbers 2 311 is four and they are located at the four corners of the bottom surface of the lower jaw 116. A return spring 2 is sleeved on each shock absorber 2 311. The shock absorber 2 311 is a damping shock absorber in the prior art. In order to be compatible with the up and down sliding adjustment of the lower jaw 116 and to ensure that the plurality of shock absorbers 2 311 can play a buffering role when the lower jaw 116 is subjected to a downward impact force, telescopic rods are respectively provided at the four corners between the bottom surface of the support seat 312 and the top surface of the base 111 313. A fixing assembly 4 for synchronously positioning the four telescopic rods 313 is further provided on the base 111. By positioning the four telescopic rods 313, a rigid connection can be formed between the support seat 312 and the base 111, so that when the lower jaw 116 is subjected to a downward impact force, it can be effectively buffered by multiple shock absorbers 311. In order to conveniently control the fixing assembly 4, a linkage assembly 5 is provided between the adjustment seat 117 and the fixing assembly 4. When the adjustment seat 117 slides upward to drive the lower jaw 116 to clamp the bearing seat 216 for positioning, it drives the linkage assembly 5 to move and then drives the fixing assembly 4 to move to position the four telescopic rods 313.

[0025] When the upper clamp body 211 is lowered, the upper clamp body 214 is tightened, and the lower clamp body 214 is tightened. Finally, the ball screw 114 is controlled to rotate to drive the lifting seat 115 to slide downward, and then drive the lower jaw 116 and the bearing seat 216 to slide downward. Under the action of the guide rod 217 and the limit seat 218, the lower clamping body 214 is driven to slide downward to test the tensile strength of the bolt 10 to be tested until the bolt 10 to be tested is broken. At the moment the bolt 10 to be tested is broken, a large impact force will be generated and distributed to the lower clamping body 214 and the lower jaw 116. At this time, the impact force of the lower clamping body 214 and the lower jaw 116 is buffered by the shock absorber 1 215 and the shock absorber 2 311 respectively, thereby avoiding the influence of the large impact force on the fitting part of the lifting seat 115 and the ball screw 114, and ensuring its use quality requirements.

[0026] Combined with attachment Figure 5 , Attachment Figure 6 , Attachment Figure 7 and attached Figure 8 As shown, the telescopic rod 313 includes a cylinder 3131 fixedly set on the base 111 and a moving rod 3132 sliding in the cylinder 3131, the top surface of the moving rod 3132 is fixedly connected to the support seat 312, and the fixing assembly 4 includes a fixing seat 411 set on the cylinder 3131, and a positioning pin 412 with a rebound function is respectively provided in the fixing seat 411, and a pin hole 1 for the positioning pin 412 to extend into is opened on the moving rod 3132. Under the cooperation of the positioning pin 412 and the pin hole 1, the moving rod 3132 is fixedly connected to the cylinder 3131, so that when the lower jaw 116 is subjected to impact force, it can be buffered by the shock absorber 2 311. The base 111 is provided with an adjustment assembly 6 for synchronously controlling the four positioning pins 412; The base 111 is provided with a two-way screw rod 711 for controlling the movement of the adjustment assembly 6. The linkage assembly 5 includes a small gear 511 provided on the two-way screw rod 711. The base 111 is provided with a large gear 512 that meshes with the small gear 511 and is also provided with a toothed plate 513 that meshes with the large gear 512. A support frame that slides with the toothed plate 513 is fixed on the base 111. A connecting rod 514 is provided on the toothed plate 513. An adjusting cylinder 515 that is fixedly connected to the adjustment seat 117 is provided on the connecting rod 514. The connecting rod 514 and the adjusting cylinder are fixedly provided with a connecting rod 514. The sliding fit of 515 can drive the adjusting cylinder 515 to slide up and down on the connecting rod 514 during the up and down sliding process of the lower jaw 116, so as not to affect the state of the connecting rod 514 and the tooth plate 513. The support seat 312 is provided with an adjustment component 8 for positioning the adjusting cylinder 515 and the connecting rod 514. By positioning the adjusting cylinder 515 and the connecting rod 514, the adjusting cylinder 515 and the connecting rod 514 can be driven to slide synchronously during the up and down sliding process of the adjusting seat 117, and then the tooth plate 513 can be driven to slide up and down.

[0027] The working principle of the linkage assembly 5 is that in the initial state, the adjustment cylinder 515 and the connecting rod 514 are released from the positioning, the moving rod 3132 and the cylinder 3131 are released from the positioning, and when the lower jaw 116 moves upward, the support seat 312 is driven to move upward synchronously, so that the moving rod 3132 extends upward in the cylinder 3131, and at the same time, the adjustment cylinder 515 slides on the connecting rod 514. When the lower jaw 116 slides upward to the connection point of the bearing seat 216, the adjustment assembly 8 is first controlled to move to fix the adjustment cylinder 515 and the connecting rod 514, and then the adjustment seat 1 is controlled. 17 slides upward, driving the lower jaw 116 to clamp the bearing seat 216. The upward sliding of the adjustment seat 117 will drive the adjustment cylinder 515, the connecting rod 514 and the tooth plate 513 to slide upward synchronously. The upward sliding of the tooth plate 513 drives the large gear 512 to rotate, and then drives the small gear 511 to rotate, and then drives the two-way screw rod 711 to rotate, thereby controlling the action of the adjustment component 6. With the cooperation of the large gear 512 and the small gear 511, the number of rotations of the small gear 511 can be increased, and the number of rotations of the two-way screw rod 711 can be increased at the same time.

[0028] Combined with attachment Figure 5 and attached Figure 8 As shown, the adjustment assembly 6 includes sliding rods 611 respectively connected to the outer end faces of the positioning pins 412 and slidingly matched with the base 111, and the base 111 is slidingly provided with wedge blocks 612 that slide relative to or opposite to each other, and the two sliding rods 611 at the same end are provided with matching blocks 613 adapted to the wedge blocks 612 at the opposite ends, and the two ends of the bidirectional screw rod 711 are threadedly provided with sliding seats 712 that slide with the base 111, and the two wedge blocks 612 are respectively fixedly connected to the corresponding sliding seats 712.

[0029] The working principle of the adjustment component 6 is that when the bidirectional screw rod 711 rotates, it drives the sliding seats 712 at both ends to slide back to back, and then drives the wedge blocks 612 at both ends to slide back to back. Under the action of the wedge blocks 612 and the matching blocks 613, the two sliding rods 611 on the same side are driven to slide back to back, and then the two positioning pins 412 on the same side are driven to slide back to back and cooperate with the corresponding pin holes, so that the four moving rods 3132 can be synchronously fixedly connected to the corresponding cylinders 3131, thereby performing synchronous positioning operations on the four telescopic rods 313.

[0030] Combined with attachment Figure 6 and attached Figure 7As shown, the adjustment assembly 8 includes a mounting seat 811 provided on the adjustment cylinder 515, a movable pin 812 is slidably penetrated in the mounting seat 811, and a pin hole 2 for the movable pin 812 to extend into is provided on the connecting rod 514. Under the cooperation of the movable pin 812 and the pin hole 2, the adjustment cylinder 515 can be fixedly connected to the connecting rod 514. A movable seat 813 is provided on the outer end surface of the movable pin 812. A T-shaped slide groove is provided on the movable seat 813 along the height direction and a matching slider 814 is slidably provided in the T-shaped slide groove. A connecting frame 815 is provided on the support seat 312. An electric push rod 816 is provided on the inner wall of the connecting frame 815, and the movable end of the electric push rod 816 is connected to the slider 814. The sliding connection between the movable seat 813 and the slider 814 can not affect the electric push rod 816 when the adjusting cylinder 515 slides up and down with the adjusting seat 117. The slider 814 is driven to slide by the extension and contraction of the electric push rod 816, and then the movable seat 813 and the movable pin 812 are mobilized to slide, so that the movable pin 812 and the pin hole 2 are matched or separated, thereby fixing or releasing the fixing operation of the adjusting cylinder 515 and the connecting rod 514.

[0031] Combined with attachment Figure 3 As shown, in order to prevent the debris at the fracture from splashing outward when the tested bolt 10 is broken, a protective door 219 is slidingly provided on the connecting cylinder 212 for opening and closing the slot 213, and an arc-shaped guide rail 220 is also provided for the sliding of the protective door 219. There are two protective doors 219 that cooperate with the slot 213 to open and close. A lock is also provided between the two protective doors 219 to fix the two together, and the two protective doors 219 are fixedly connected by the lock.

[0032] When the present invention is implemented, the bearing seat 216 is first placed vertically on a workbench with a hole, and then the blocking pad 9 and the tension ring 11 are connected to the bolt 10 to be tested, the protective door 219 is opened, and the blocking pad 9 is placed in the groove in the upper clamp body 211. Then the staff holds the upper clamp body 211 and fixes it to the upper jaw 113. Then the lifting seat 115 and the lower jaw 116 are controlled to slide upward so that the lower jaw 116 slides to the connection point of the bearing seat 216. The upward sliding of the adjustment seat 117 is controlled to drive the lower jaw 116 to clamp the bearing seat 216, and at the same time drive the linkage assembly 5 to move, and then drive the fixing assembly 4 to perform synchronous positioning operation on the four telescopic rods 313. Then close the protective door 219, and finally control the ball screw 114 to rotate and drive the lifting seat 115 to slide downward, and then drive the lower jaw 116 and the bearing seat 216 to slide downward, and under the action of the guide rod 217 and the limit seat 218, drive the lower clamping body 214 to slide downward and stretch, and test the tensile strength of the bolt 10 to be tested until the bolt 10 to be tested is broken. At the moment the bolt 10 to be tested is broken, a large impact force will be generated and distributed to the lower clamping body 214 and the lower jaw 116. At this time, the impact force of the lower clamping body 214 and the lower jaw 116 is buffered by the shock absorber 1 215 and the shock absorber 2 311 respectively, thereby avoiding the influence of the large impact force on the fitting part of the lifting seat 115 and the ball screw 114, and ensuring its quality requirements during long-term use.

[0033] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above and, without departing from the purpose of the present invention, designs structures and embodiments similar to the technical solution without creatively designing, they shall fall within the scope of protection of the present invention.

Claims

1. A bolt performance testing device for automobiles, comprising a universal tensile testing machine (1), wherein the universal tensile testing machine (1) is composed of a base (111), a support column (112), an upper jaw (113), a ball screw (114), a lifting seat (115) and a lower jaw (116), wherein the rotation of the ball screw (114) drives the lifting seat (115) to slide up and down, and the lower jaw (116) is connected to the lifting seat (115) and the closing and opening operation of the lower jaw (116) is controlled by the up and down sliding of the adjustment seat (117), characterized in that: It also includes an upper clamping body (211) clamped and positioned by the upper jaw (113), a connecting tube (212) is provided on the outer wall of the upper clamping body (211), a lower clamping body (214) is slidably provided on the inner wall of the connecting tube (212), a plurality of shock absorbers (215) are evenly provided on the bottom surface of the lower clamping body (214), the other ends of the plurality of shock absorbers (215) are commonly connected to a bearing seat (216) clamped and positioned by the lower jaw (116), and a guide rod (217) is fixed on the bearing seat (216) and is slidably matched with the lower clamping body (214), and a limit seat (218) is provided on the top surface of the guide rod (217); A plurality of shock absorbers (311) are evenly arranged on the bottom surface of the lower jaw (116), and the other ends of the plurality of shock absorbers (311) are commonly connected to a support seat (312). Telescopic rods (313) are respectively provided at the four corners between the support seat (312) and the base (111). A fixing assembly (4) for synchronously positioning the four telescopic rods (313) is also provided on the base (111). A linkage assembly (5) is provided between the adjustment seat (117) and the fixing assembly (4). When the adjustment seat (117) slides upward to drive the lower jaw (116) to clamp and position the bearing seat (216), the linkage assembly (5) is driven to move and then the fixing assembly (4) is driven to move to position the four telescopic rods (313).

2. The automobile bolt performance testing device according to claim 1, characterized in that: The telescopic rod (313) includes a cylinder (3131) fixedly arranged on the base (111) and a moving rod (3132) sliding in the cylinder (3131). The top surface of the moving rod (3132) is fixedly connected to the support seat (312). The fixing assembly (4) includes a fixing seat (411) arranged on the cylinder (3131). The fixing seat (411) is respectively provided with a positioning pin (412) with a rebound function. The moving rod (3132) is provided with a pin hole for the positioning pin (412) to extend into. The base (111) is provided with an adjustment assembly (6) for synchronously controlling the four positioning pins (412).

3. The automobile bolt performance testing device according to claim 2, characterized in that: A bidirectional screw rod (711) for controlling the movement of the adjustment assembly (6) is rotatably provided on the base (111), the linkage assembly (5) includes a small gear (511) arranged on the bidirectional screw rod (711), a large gear (512) meshing with the small gear (511) is rotatably provided on the base (111), and a toothed plate (513) meshing with the large gear (512) is also slidably provided on the base (111), a connecting rod (514) is provided on the toothed plate (513), an adjustment cylinder (515) fixedly connected to the adjustment seat (117) is slidably provided on the connecting rod (514), and an adjustment assembly (8) for positioning the adjustment cylinder (515) and the connecting rod (514) is provided on the support seat (312).

4. The automobile bolt performance testing device according to claim 2 or 3, characterized in that: The adjustment assembly (6) includes sliding rods (611) respectively connected to the outer end surfaces of the positioning pins (412) and slidingly matched with the base (111), the base (111) is slidingly provided with wedge blocks (612) that slide relative to or opposite to each other, and the two sliding rods (611) at the same end are provided with matching blocks (613) adapted to the wedge blocks (612) at the opposite ends, and the two ends of the bidirectional screw rod (711) are threadedly provided with sliding seats (712) that slide with the base (111), and the two wedge blocks (612) are respectively fixedly connected to the corresponding sliding seats (712).

5. The automobile bolt performance testing device according to claim 3, characterized in that: The adjustment assembly (8) includes a mounting seat (811) arranged on the adjustment cylinder (515), a movable pin (812) is slidably inserted into the mounting seat (811), a connecting rod (514) is provided with two pin holes for the movable pin (812) to extend into, a movable seat (813) is provided on the outer end surface of the movable pin (812), and a slider (814) is slidably provided in the movable seat (813), a connecting frame (815) is provided on the support seat (312), an electric push rod (816) is provided on the inner wall of the connecting frame (815), and the movable end of the electric push rod (816) is connected to the slider (814).

6. The automobile bolt performance testing device according to claim 1, characterized in that: The connecting tube (212) is provided with a notch (213) for placing a bolt, and a protective door (219) is slidably provided on the connecting tube (212) for opening and closing the notch (213), and is also provided with an arc-shaped guide rail (220) for the protective door (219) to slide.

7. The automobile bolt performance testing device according to claim 6, characterized in that: There are two protective doors (219) that cooperate with each other to open and close the notch (213), and a lock is provided between the two protective doors (219).

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