Pressure measuring device for automobile spring detection

Abstract

The invention relates to the technical field of spring detection, and particularly discloses a pressure measuring device for automobile spring detection, which comprises a transversely arranged base, a conveying seat is arranged on the base, a closed-loop conveying assembly is arranged in the conveying seat, and a plurality of carrier plates are connected to the closed-loop conveying assembly. A spring sleeve rod perpendicular to the conveying direction is arranged above the carrying plate, the rear end of the spring sleeve rod is connected with a limiting disc, a connecting pin shaft is fixedly arranged on the limiting disc, a first gear is arranged at the end of the connecting pin shaft, and a connecting block rotationally connected with the connecting pin shaft is arranged at the rear end of the upper surface of the carrying plate. According to the automobile spring pressure detection device, assembly line type efficient detection of automobile spring pressure is achieved, the safety in the automobile spring detection process is improved, a good detection effect is achieved, in addition, the automobile spring can be accurately located under the annular pressing plate before pressure measurement, the pressure measurement work is completed by keeping the automobile spring in a vertical standing state, and the detection efficiency is improved. And the accuracy of automobile spring pressure detection is improved.

Description

Technical Field

[0001] The invention relates to the technical field of spring detection, and in particular discloses a pressure measuring device for automobile spring detection. Background Art

[0002] As an important component of the automobile chassis, the spring needs to be tested for fatigue resistance and pressure after its preparation to ensure the performance of the final product. Among them, the spring fatigue test is usually carried out by random sampling, while the spring pressure test requires a comprehensive test. The existing equipment for spring pressure testing has a relatively simple structure, which consists of a base, a hydraulic cylinder, a pressure plate and a pressure detection system. During the spring pressure measurement process, the spring is placed on the upper surface of the base, and then the hydraulic cylinder pushes the pressure plate downward to gradually compress the spring. During the gradual compression of the spring, the pressure value is measured at the feedback of the pressure detection system.

[0003] For example, the invention patent with announcement number CN108572039A discloses a spring pressure detection device, including a base, a first supporting leg and a second supporting leg are respectively provided on the top of the base, the first supporting leg is located directly in front of the second supporting leg and a test ruler is provided on the front of the first supporting leg, the top of the first supporting leg and the top of the second supporting leg are both fixedly connected to the bottom of the top seat, a fixing block is provided on the top of the top seat, the front of the fixing block and the axial center of the front of the gear are successively penetrated by one end of the rotating shaft, one end of the rotating shaft is fixedly connected to one end of the rocker, a rod hole is opened on the upper surface of the top seat, the bottom of the top seat is fixedly connected to the top of the limiting tube and the inner cavity of the limiting tube is connected to the rod hole, a test rod is inserted in the limiting tube, one end of the test rod extends to directly above the rod hole, a latch tooth is provided on the top of the surface of the test rod and the latch tooth is meshed with the grinding tooth of the gear, and the bottom of the surface of the test rod is fixedly connected to one end of the level ruler. The spring pressure detection device disclosed in this patent is a common spring pressure detection instrument on the market, which only uses manual pressure to replace the pressure of the hydraulic cylinder. Although it realizes the detection of spring pressure, the detection device cannot continuously detect large quantities of springs one by one. During the detection process, the spring needs to be manually erected and fixed under the pressure plate, and the automobile spring is heavy, which makes the loading process very time-consuming and labor-intensive, affecting the detection efficiency. Therefore, in view of the above-mentioned shortcomings of the existing spring pressure detection device, the present application proposes a pressure measuring device for automobile spring detection that can fully automatically realize batch and rapid detection of automobile springs. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure measuring device for automobile spring testing, so as to realize automatic pressure measurement of a large number of automobile springs and ensure the stability of the automobile springs during the measurement process and the accuracy of the test results.

[0005] The present invention is achieved through the following technical solutions:

[0006] A pressure measuring device for automobile spring detection, comprising a horizontally placed machine base, a conveying seat is arranged on the machine base, a closed-loop conveying assembly is arranged in the conveying seat, a plurality of carrier plates are connected to the closed-loop conveying assembly at equal intervals, a spring sleeve rod arranged perpendicular to the conveying direction is arranged above the carrier plate, a rear end of the spring sleeve rod is connected to a limiting disc, a connecting pin is fixedly arranged on the limiting disc, and a first gear is arranged at the end of the connecting pin, a connecting block rotatably connected to the connecting pin is arranged on the rear end of the upper surface of the carrier plate, and a supporting block for supporting the spring sleeve rod is arranged at the front end of the upper surface of the carrier plate;

[0007] A vertical frame is provided at the rear end of the machine base, a C-shaped frame is provided in the vertical frame, and a pushing device for driving the C-shaped frame to move forward and backward is provided on the vertical frame, the front side of the lower end of the C-shaped frame is provided with an inclined surface, and a notch for passing a spring sleeve rod is provided at the front side of the lower end of the C-shaped frame, and a first rack acting on the first gear is provided at the lower end of the C-shaped frame;

[0008] A pressing device is arranged on the top of the C-shaped frame, the lower end of the pressing device is connected to a sleeve frame, the lower end of the sleeve frame is connected to an annular pressure sensor, and the lower end of the annular pressure sensor is connected to an annular pressure plate.

[0009] As a further configuration of the above scheme, the closed-loop conveying assembly includes rotating shafts arranged at the left and right ends of the conveying seat, and one end of the rotating shafts is connected to a driving motor, and transmission wheels are arranged on the two rotating shafts, and a closed-loop conveying member is arranged between the two transmission wheels, and a plurality of the carrier plates are evenly spaced and arranged on the outer surface of the closed-loop conveying member.

[0010] As a further configuration of the above scheme, a transmission wheel is respectively arranged on the front and rear of the two rotating shafts, and a closed-loop conveying member is arranged between the two transmission wheels aligned left and right, and the closed-loop conveying member is one of a conveying belt or a transmission chain.

[0011] As a further configuration of the above solution, a control console with a display screen is connected to the base, and the annular pressure sensor is electrically connected to the control console.

[0012] As a further arrangement of the above scheme, convex plates are provided on the C-shaped frame located on the left and right sides of the notch, and clamping cylinders are installed on the two convex plates. The telescopic ends of the two clamping cylinders are connected to clamping blocks, and semicircular limiting grooves with a radius greater than the spring radius are provided on the opposite sides of the two clamping blocks.

[0013] As a further configuration of the above solution, a guide slide bar is connected to the rear end surface of the C-shaped frame, and a through hole for passing the guide slide bar is opened on the vertical frame.

[0014] As a further configuration of the above solution, the spring sleeve rod comprises a hollow tube, a plurality of struts are arranged on the outer side of the hollow tube, and an adjustment mechanism for realizing synchronous opening or contraction of the plurality of struts is arranged in the hollow tube.

[0015] As a further arrangement of the above scheme, both front and rear ends of the hollow tube are provided with openings aligned with the support bar, and the adjustment mechanism includes a bidirectional screw rod rotatably arranged in the hollow tube, and both ends of the bidirectional screw rod are rotatably provided with screw hole moving blocks located inside the hollow tube, and the screw hole moving blocks are evenly connected in the circumference with protrusions extending out of the openings, and the protrusions are rotatably connected with connecting rods, and the movable ends of the two aligned connecting rods are connected to the same corresponding support bar.

[0016] As a further configuration of the above scheme, one end of the bidirectional screw rod extends out of the hollow tube, and a second gear is connected to the outer end of the bidirectional screw rod, and a second rack meshing with the second gear is provided on the conveying seat located upstream of the stand.

[0017] As a further configuration of the above solution, 2-4 struts are provided and are evenly arranged circumferentially around the periphery of the empty tube.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. During the operation of the pressure measuring device for automobile spring detection disclosed in the present invention, it is only necessary to manually insert the automobile springs to be detected into the spring sleeve rod one by one and place them in a horizontal state, and then the closed-loop conveyor can move them one by one to the pressure detection station. After moving to the detection station, the C-shaped frame is moved forward by the pushing device. During the movement, on the one hand, the automobile spring can be automatically erected and placed in the C-shaped frame with the spring sleeve rod through the action of the first gear and the first rack. On the other hand, during the downward pressure detection process of the pressing device, due to the presence of the spring sleeve rod, the safety hazard caused by the bending and collapse of the spring can be avoided. The entire pressure measuring device for automobile spring detection not only realizes the assembly line-type efficient detection of automobile spring pressure, but also improves the safety during the automobile spring detection process, and has a good detection effect.

[0020] 2. The present invention further improves the structure of the spring sleeve rod so that before the automobile spring in the spring sleeve rod is erected, multiple stays can be opened synchronously through an adjustment mechanism, and the automobile spring is supported and fixed by multiple stays and kept concentric with the spring sleeve rod, so that the automobile spring can be accurately located directly below the annular pressure plate before pressure measurement and maintain a vertical upright state to complete the pressure measurement, thereby improving the accuracy of automobile spring pressure detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure from a first angle of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure from a second angle of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the C-shaped frame, the pressing device, the sleeve frame, etc. in the first angle of the present invention;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the C-shaped frame, the pressing device, the sleeve frame, etc. at a second angle in the present invention;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the carrier plate, spring sleeve rod, etc. in Example 1 of the present invention;

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the carrier plate, spring sleeve rod, etc. in Example 2 of the present invention;

[0028] Figure 7 It is a schematic diagram of the three-dimensional exploded structure of the spring sleeve rod in Example 2 of the present invention;

[0029] Figure 8 Schematic diagram of the internal three-dimensional structure of the cross section of the spring sleeve rod in Example 2 of the present invention;

[0030] Fig. 9 For the present invention Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0031] in:

[0032] 1-machine base, 2-conveying base, 3-closed-loop conveying assembly, 4-carrying plate, 5-spring sleeve rod, 6-limiting disc, 7-connecting pin, 8-first gear, 9-connecting block, 10-support block, 11-stand, 12-C-shaped frame, 13-pushing device, 14-pressing device, 15-sleeve frame, 16-annular pressure sensor, 17-annular pressure plate, 18-control console, 19-clamping cylinder, 20-clamping block, 201-semicircular limiting groove, 21-guide slide rod;

[0033] 301-rotating shaft, 302-driving motor, 303-transmission wheel, 304-closed-loop conveying member;

[0034] 121-notch, 122-first rack, 123-convex plate;

[0035] 501-hollow tube, 502-stay, 503-bar mouth, 504-bidirectional screw rod, 505-screw hole moving block, 506-protrusion, 507-connecting rod, 508-second gear, 509-second rack. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 9 , and describes the application in detail with reference to embodiments.

[0038] Example 1

[0039] Embodiment 1 discloses a pressure measuring device for automobile spring testing, Figure 1 and attached Figure 2 The main body of the device includes a horizontally placed machine base 1, a conveying seat 2 is arranged at the upper end of the machine base 1, and then a closed-loop conveying assembly 3 is arranged in the conveying seat 2, and a plurality of carriers 4 are connected to the closed-loop conveying assembly 3 at equal intervals. Specifically, the closed-loop conveying assembly 3 includes rotating shafts 301 arranged at the left and right ends of the conveying seat 2, and a driving motor 302 is connected to the end of one of the rotating shafts 301, and then transmission wheels 303 are arranged on both rotating shafts 301, and a closed-loop conveying member 304 is arranged between the two transmission wheels 303, and then a plurality of carriers 4 are arranged on the outer surface of the closed-loop conveying member 304 at equal intervals. In the specific design, a transmission wheel 303 is respectively arranged on the front and rear of the two rotating shafts 301, and then a closed-loop conveyor 304 is arranged between the two transmission wheels 303 aligned on the left and right, and the closed-loop conveyor 304 can be selected from a conveyor belt or a transmission chain, so that under the power input of the driving motor 302, all the carriers 4 are circulated through the closed-loop conveyor 304, and the carriers 4 are moved to the measuring station one by one.

[0040] Reference Figure 5A spring sleeve rod 5 is arranged above the carrier plate 4 and is arranged perpendicular to the conveying direction of the closed-loop conveyor 304. The rear end of the spring sleeve rod 5 is connected to a limiting disc 6, and then a connecting pin 7 is fixedly arranged on the limiting disc 6, and a first gear 8 is arranged at the end of the connecting pin 7. At the same time, a connecting block 9 is arranged at the rear end of the upper surface of the carrier plate 4 and is rotatably connected to the connecting pin 7. A supporting block 10 for supporting the spring sleeve rod 5 is arranged at the front end of the upper surface of the carrier plate 4. When the automobile spring to be tested is inserted into the spring sleeve rod 5, the spring sleeve rod 5 will be horizontally laid down due to the action of gravity, and after being laid down, one end of the spring sleeve rod 5 is stably supported by the supporting block 10.

[0041] Reference Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 The rear end of the machine base 1 is provided with a stand 11, a C-shaped frame 12 is provided in the stand 11, and a pushing device 13 for driving the C-shaped frame 12 to move forward and backward is also provided on the stand 11. In addition, a guide slide bar 21 is connected to the rear end surface of the C-shaped frame 12, and a through hole for passing the guide slide bar 21 is provided on the stand 11, so that when the pushing device 13 pushes the C-shaped frame 12 to move forward and backward, it will be guided by the guide slide bar 21 to avoid deviation.

[0042] In this embodiment, the front side of the lower end of the C-shaped frame 12 is arranged in an inclined surface, and a notch 121 for passing the spring sleeve rod 5 is opened at the front side of the lower end of the C-shaped frame 12, and then a first rack 122 that acts with the first gear 8 is arranged at the lower end of the C-shaped frame 12. When the C-shaped frame 12 moves forward, the front side of the lower end of the C-shaped frame 12 can scoop up the spring sleeve rod 5 so that its bottom is placed at the lower end of the C-shaped frame 12, and at the same time, the spring sleeve rod 5 starts to rotate through the meshing transmission of the first rack 122 and the first gear 8, so that the original spring is completely erected and placed on the lower end of the C-shaped frame 12, and is limited by the spring sleeve rod 5 to prevent the spring from being collapsed during the pressure measurement process to cause safety hazards. In addition, in order to maintain the standing state before the spring pressure is measured, the present embodiment 1 is further provided with convex plates 123 on the C-shaped frame 12 located on the left and right sides of the notch 121, and clamping cylinders 19 are installed on the two convex plates 123, and then clamping blocks 20 are connected to the telescopic ends of the two clamping cylinders 19, and semicircular limiting grooves 201 with a radius greater than the radius of the spring are opened on the opposite sides of the two clamping blocks 20. The two clamping cylinders 19 push the two clamping blocks 20 to approach each other, and then the two semicircular limiting grooves 201 surround the periphery of the spring to limit it.

[0043] A pressing device 14 is provided on the top of the C-shaped frame 12. The pressing device 14 can be a pneumatic cylinder or a hydraulic cylinder. A sleeve frame 15 is connected to the lower end of the pressing device 14. An annular pressure sensor 16 is connected to the lower end of the sleeve frame 15. An annular pressure plate 17 is connected to the lower end of the annular pressure sensor 16. In addition, a console 18 with a display screen is connected to the base 1, and the annular pressure sensor 16 is electrically connected to the console 18. During the extension process of the pressing device 14, the sleeve frame 15, the annular pressure sensor 16 and the annular pressure plate 17 are pushed downward, so that the spring sleeve rod 5 passes through the top thereof, and then contacts the top of the spring, applying a vertical downward force to the spring to compress it, and completing the pressure measurement process.

[0044] When the pressure measuring device for automobile spring testing disclosed in the present embodiment 1 is used, each automobile spring to be tested is inserted into the spring sleeve rod 5, and then the spring sleeve rod 5 is placed horizontally, and then the carrier plate 4 and the automobile spring above are moved toward the vertical frame 11 through the closed-loop conveyor 304. When it is moved to be aligned with the vertical frame 11 front and back, the pushing device 13 is started to move the C-shaped frame 12 forward.

[0045] When the C-shaped frame 12 moves forward, the first rack 122 meshes with the first gear 8, causing the spring sleeve rod 5 to rotate around the connecting pin 7, thereby standing up the spring sleeve rod 5 and the automobile spring, and supporting the bottom of the automobile spring at the front side of the lower end of the C-shaped frame 12 during the tension of the automobile spring.

[0046] Then, the two clamping blocks 20 are brought closer to each other through the clamping cylinder 19, and then the two semicircular limiting grooves 201 are enclosed around the periphery of the spring to limit it, so that the spring is in a vertical state. Then, the pressing device 14 is started to push the sleeve 15, the annular pressure sensor 16 and the annular pressure plate 17 downward until the annular pressure plate 17 contacts the upper end of the automobile spring, and then the two clamping blocks 20 are moved away from each other. In the subsequent pressing process, the spring gradually shortens, and the pressure value measured by the annular pressure sensor 16 can be fed back and recorded by the console 18 in real time, which is convenient for the operator to observe and read later.

[0047] Example 2

[0048] Example 2 discloses a pressure measuring device for automobile spring testing that is improved based on the technical solution in Example 1. The similarities between the device and Example 1 are not described again.

[0049] In this embodiment 2, the spring sleeve rod 5 is improved and designed. Figure 7 , Attachment Figure 8 and attached Fig. 9It includes a hollow tube 501, and a plurality of struts 502 are arranged on the outside of the hollow tube 501. Specifically, 2-4 struts 502 are arranged and are evenly arranged circumferentially on the periphery of the hollow tube 501. Then, an adjusting mechanism is arranged in the hollow tube 501 to realize the synchronous opening or contraction of the plurality of struts 502.

[0050] The specific design is that a strip opening 503 aligned with the support bar 502 is opened at both ends of the front and rear of the hollow tube 501, and the adjustment mechanism includes a bidirectional screw rod 504 rotatably set in the hollow tube 501, and then a screw hole moving block 505 located inside the hollow tube 501 is rotatably set at both ends of the bidirectional screw rod 504, and a plurality of protrusions 506 extending out of the corresponding strip openings 503 are evenly connected in the circumferential direction of the screw hole moving block 505, and then a connecting rod 507 is rotatably connected to the protrusion 506, and the movable ends of the two aligned connecting rods 507 are connected to the same corresponding support bar 502.

[0051] In addition, a hollow tube 501 is extended from one end of the bidirectional screw rod 504, and a second gear 508 is connected to the outer end of the bidirectional screw rod 504. A second rack 509 meshing with the second gear 508 is provided on the conveying seat 2 located upstream of the stand 11.

[0052] In this embodiment 2, through the above-mentioned improved design of the spring sleeve rod 5, after the automobile spring is inserted into the spring sleeve rod 5 and moves to the measuring station along with the closed-loop conveyor 304, the two-way screw rod 504 can be rotated through the meshing transmission between the second rack 509 and the second gear 508, so that the two screw hole moving blocks 505 are close to each other. In the process of the two screw hole moving blocks 505 approaching each other, all the struts 502 will expand radially outward through the action of the connecting rod 507, and the automobile spring will be supported and fixed by the struts 502 and kept concentric with the spring sleeve rod 5, and then after the spring sleeve rod 5 is erected, it will be limited by the two clamping blocks 20, and at the same time, the supporting state of the spring will be released for pressure measurement, so that the automobile spring can be accurately located directly below the annular pressure plate 17 before the pressure measurement, and maintain a vertical erected state to complete the pressure measurement work.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure measuring device for automobile spring testing, characterized in that: The invention comprises a horizontally placed machine base (1), wherein a conveying seat (2) is arranged on the machine base (1), a closed-loop conveying assembly (3) is arranged in the conveying seat (2), a plurality of carrier plates (4) are connected at equal intervals on the closed-loop conveying assembly (3), a spring sleeve rod (5) arranged perpendicular to the conveying direction is arranged above the carrier plate (4), the rear end of the spring sleeve rod (5) is connected to a limiting disc (6), a connecting pin (7) is fixedly arranged on the limiting disc (6), and a first gear (8) is arranged at the end of the connecting pin (7), a connecting block (9) rotatably connected to the connecting pin (7) is arranged at the rear end of the upper surface of the carrier plate (4), and a supporting block (10) for supporting the spring sleeve rod (5) is arranged at the front end of the upper surface of the carrier plate (4); A stand (11) is provided at the rear end of the machine base (1), a C-shaped frame (12) is provided in the stand (11), and a pushing device (13) for driving the C-shaped frame (12) to move forward and backward is provided on the stand (11), the front side of the lower end of the C-shaped frame (12) is provided with an inclined surface, and a notch (121) for passing a spring sleeve rod (5) is provided at the front side of the lower end of the C-shaped frame (12), and a first rack (122) for interacting with a first gear (8) is provided at the lower end of the C-shaped frame (12); A pressing device (14) is provided at the top of the C-shaped frame (12); the lower end of the pressing device (14) is connected to a sleeve frame (15); the lower end of the sleeve frame (15) is connected to an annular pressure sensor (16); and the lower end of the annular pressure sensor (16) is connected to an annular pressure plate (17).

2. A pressure measuring device for automobile spring testing according to claim 1, characterized in that: The closed-loop conveying assembly (3) comprises rotating shafts (301) arranged at the left and right ends of the conveying seat (2), and the end of one of the rotating shafts (301) is connected to a driving motor (302), and the two rotating shafts (301) are each provided with a transmission wheel (303), and a closed-loop conveying member (304) is provided between the two transmission wheels (303), and a plurality of the carrier plates (4) are arranged at equal intervals on the outer surface of the closed-loop conveying member (304).

3. A pressure measuring device for automobile spring testing according to claim 2, characterized in that: A transmission wheel (303) is respectively arranged on the front and rear of the two rotating shafts (301), and a closed-loop conveying member (304) is arranged between the two transmission wheels (303) aligned left and right. The closed-loop conveying member (304) is one of a conveying belt or a transmission chain.

4. A pressure measuring device for automobile spring testing according to claim 1, characterized in that: The machine base (1) is connected to a control console (18) with a display screen, and the annular pressure sensor (16) is electrically connected to the control console (18).

5. A pressure measuring device for automobile spring testing according to claim 1, characterized in that: A convex plate (123) is provided on the C-shaped frame (12) on the left and right sides of the notch (121), a clamping cylinder (19) is installed on both convex plates (123), the telescopic ends of the two clamping cylinders (19) are connected to clamping blocks (20), and semicircular limiting grooves (201) with a radius greater than the spring radius are provided on the opposite sides of the two clamping blocks (20).

6. A pressure measuring device for automobile spring testing according to claim 1, characterized in that: A guide slide bar (21) is connected to the rear end surface of the C-shaped frame (12), and a through hole for passing the guide slide bar (21) is provided on the vertical frame (11).

7. A pressure measuring device for automobile spring testing according to claim 1, characterized in that: The spring sleeve rod (5) comprises a hollow tube (501), a plurality of struts (502) are arranged on the outside of the hollow tube (501), and an adjustment mechanism for realizing synchronous opening or contraction of the plurality of struts (502) is arranged in the hollow tube (501).

8. A pressure measuring device for automobile spring testing according to claim 7, characterized in that: The front and rear ends of the hollow tube (501) are both provided with a strip opening (503) aligned with the support bar (502), and the adjustment mechanism includes a bidirectional screw rod (504) rotatably arranged in the hollow tube (501), and both ends of the bidirectional screw rod (504) are rotatably provided with a screw hole moving block (505) located inside the hollow tube (501), and the screw hole moving block (505) is evenly connected with a protrusion (506) extending out of the strip opening (503) in the circumferential direction, and a connecting rod (507) is rotatably connected to the protrusion (506), and the movable ends of the two aligned front and rear connecting rods (507) are connected to the same corresponding support bar (502).

9. A pressure measuring device for automobile spring testing according to claim 8, characterized in that: One end of the bidirectional screw rod (504) extends out of the hollow tube (501), and a second gear (508) is connected to the outer end of the bidirectional screw rod (504). A second rack (509) meshing with the second gear (508) is provided on the conveying seat (2) located upstream of the stand (11).

10. A pressure measuring device for automobile spring testing according to any one of claims 7 to 9, characterized in that: There are 2 to 4 struts (502) arranged uniformly around the periphery of the empty tube (501).

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