Automobile piston rod detection mechanism

Abstract

The invention relates to the technical field of piston rod detection, in particular to an automobile piston rod detection mechanism, which comprises the following structures: air tightness detection equipment; the bearing part is arranged on the air tightness detection equipment and is used for fixing the oil cylinder; the bearing part comprises two guide rails, a bearing plate slidably arranged on the guide rails and a vertical cylinder penetrating through the bearing plate. In the using process, a worker does not need to place and replace the air outlet nozzle frequently, the worker only needs to insert the connector on the oil cylinder into the vertical cylinder, and when the air tightness detection equipment works, the connector on the oil cylinder can be fully inserted into the vertical cylinder, so that the air tightness detection efficiency is improved. And then under the assistance of the gas source piece, the first sealing piece and the second sealing piece, the connector of the oil cylinder is plugged, the replacement work of workers is reduced, meanwhile, gas leakage is avoided, and the detection accuracy of the device is further guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of piston rod detection, and more particularly to an automobile piston rod detection mechanism. BACKGROUND

[0002] The automobile piston rod is used in the automobile shock absorber, buffers the road impact through reciprocating motion, improves the comfort and maneuverability of vehicle driving, and is mainly used in combination with a piston, a cylinder, hydraulic oil, a spring, a sealing element and other components in the shock absorber.

[0003] In the process of automobile piston rod detection, the air tightness detection of the automobile piston rod and the cylinder is particularly important. The existing air tightness detection equipment generally requires the worker to place the cylinder on the detection table, and then start the equipment for detection. During the detection process, the worker needs to place different air outlets according to different types of automobile piston rods and cylinders, and the air outlet is only placed on the output end of the air tightness detection equipment. Therefore, the worker needs to frequently change the air outlet during the detection process, which increases the work content of the worker. In addition, the placement process may cause the air outlet and the output end of the air tightness detection equipment to be not tight, thereby causing gas leakage and further causing inaccurate air tightness detection.

[0004] Therefore, the present application provides an automobile piston rod detection mechanism to solve the above problems. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present application provide an automobile piston rod detection mechanism to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an automobile piston rod detection mechanism, comprising the following structure: an air tightness detection equipment; a bearing member mounted on the air tightness detection equipment for fixing the cylinder, characterized in that: the bearing member comprises two guide rails, a bearing plate slidably arranged on the guide rails, and a vertical cylinder penetrating the bearing plate; an air source member arranged in the vertical cylinder, comprising a spigot fixed to the bottom of the vertical cylinder; a first sealing member sleeved on the spigot for sealing the inner side of the cylinder connector; a second sealing member arranged on the side wall of the vertical cylinder for sealing the outer side of the cylinder connector; and a protective member arranged on the upper end of the vertical cylinder for blocking the gap between the cylinder and the vertical cylinder.

[0007] In a preferred embodiment, the bearing member comprises two guide rails arranged on the air tightness detection equipment, two bearing plates matched with the guide rails, a vertical cylinder penetrating the bearing plate, an air inlet pipe threadedly mounted on the vertical cylinder, an air inlet one-way pipe penetrating the side wall of the vertical cylinder, and a pressure relief pipe penetrating the vertical cylinder.

[0008] In a preferred implementation form, the air source member comprises a pipe integrally installed on the bottom of the vertical cylinder, the vertical cylinder is provided with a piston plate, the piston plate is sleeved on the pipe, the piston plate and the pipe are in sliding sealing connection, the piston plate is connected with a sealing member, the connecting pipe is in contact with the sealing member, the lower end of the piston plate is fixedly connected with a spring connected with the bottom of the vertical cylinder, and the lower end of the piston plate and the vertical cylinder form an air cavity.

[0009] In a preferred implementation form, the sealing member comprises a hard rubber plate fixedly connected to the piston plate, the upper end of the hard rubber plate is bonded with a sealing cover, the sealing cover and the hard rubber plate are filled with a water source, the upper end of the sealing cover is fixedly connected with a soft rubber pad, and the soft rubber pad is provided with a plurality of air holes.

[0010] In a preferred implementation form, the first sealing member comprises a first receiving ring sleeved on the pipe, and the first receiving ring is above the piston plate, the first receiving ring is provided with an air bag ring, the side wall of the air bag ring is fixedly connected with two soft rubber rings, the two soft rubber rings are fixedly connected with two sealing members, the first receiving ring is provided with two delivery pipes in communication with the air bag ring, and the lower ends of the two delivery pipes respectively pass through the side wall of the piston plate and extend into the air cavity.

[0011] In a preferred implementation form, the sealing member comprises a plurality of soft rubber blocks bonded to the side wall of the soft rubber ring, the plurality of soft rubber blocks are provided with metal reinforcing bars, the side wall of the plurality of soft rubber blocks is fixedly connected with metal friction plates, and the side wall of the plurality of soft rubber blocks is fixedly connected with a plurality of soft rubber pads.

[0012] In a preferred implementation form, the delivery member comprises a placing groove arranged on the inner side wall of the vertical cylinder, the vertical cylinder is provided with two symmetrical delivery channels in communication with the placing groove, the delivery channels are filled with a water source, the side walls of the two delivery channels are provided with delivery holes, the two delivery channels are in communication with the air cavity through the delivery holes, the two delivery channels are provided with piston blocks matched with the two delivery channels, and the placing groove is provided with a second receiving ring matched with the placing groove.

[0013] In a preferred implementation form, the second sealing member comprises a water bag ring arranged on the inner side wall of the second receiving ring, the water bag ring is in communication with the two delivery channels through the two connecting pipes, the side wall of the water bag ring is fixedly connected with a plurality of groups of rubber rings, the side wall of the plurality of groups of rubber rings is fixedly connected with a plurality of adhesive pads, the side wall of the second receiving ring is fixedly connected with a plurality of symmetrical limiting plates, and the end faces of the plurality of limiting plates are fixedly connected with smooth metal sheets in contact with the water bag ring.

[0014] In a preferred embodiment, the protection piece comprises a hard rubber ring fixedly connected to the upper end surface of the vertical pipe, the upper end surface of the hard rubber ring is fixedly connected with a connecting plastic ring, the upper end surface of the connecting plastic ring is fixedly connected with a rubber skirt, a plurality of metal elastic strips are arranged at the connecting position of the connecting plastic ring and the rubber skirt, and a plurality of sealing grooves are arranged on the end surface of the rubber skirt.

[0015] Technical effects and advantages of the present application:

[0016] In the use process of the present application, the staff does not need to frequently place and replace the air outlet nozzle, only needs to insert the connecting head on the oil cylinder into the vertical cylinder, when the air tightness detection equipment works, the connecting head on the oil cylinder can be fully inserted into the vertical cylinder, and then the air source piece, the first sealing piece and the second sealing piece are used to realize the plugging of the connecting head of the oil cylinder, reduce the replacement work of the staff, avoid the leakage of the gas, and further ensure the accuracy of the device detection. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present application;

[0018] Figure 2 It is a local connection structure schematic diagram of the oil cylinder and the bearing piece in the present application;

[0019] Figure 3 It is an exploded connection structure schematic diagram of the oil cylinder and the bearing piece in the present application;

[0020] Figure 4 It is a connection structure schematic diagram of the bearing piece in the present application;

[0021] Figure 5 It is a first local section view connection structure schematic diagram of Figure 4 ;

[0022] Figure 6 It is a second local section view connection structure schematic diagram of Figure 4 ;

[0023] Figure 7 It is a local connection structure schematic diagram of the sealing piece in the present application;

[0024] Figure 8 It is a local connection structure schematic diagram of the first sealing piece in the present application;

[0025] Figure 9 It is a local connection structure schematic diagram of the sealing piece in the present application;

[0026] Figure 10 It is a third local section view connection structure schematic diagram of Figure 4 ;

[0027] Figure 11 A schematic view of a local connecting structure of a second sealing member in the application;

[0028] Figure 12 A schematic view of a local connecting structure of a vertical cylinder and a protective member in the application.

[0029] The reference signs are as follows: 1 air tightness detection equipment;

[0030] 2 a bearing member, 21 a guide rail, 22 a bearing plate, 23 a vertical cylinder, 24 an air inlet pipeline, 25 an air inlet one-way pipe, 26 a pressure relief pipe;

[0031] 3 an oil cylinder, 4 a connecting head;

[0032] 5 an air source member, 51 a cannula, 52 a piston plate, 53 a plugging member, 54 a spring, 55 a gas cavity;

[0033] 531 a hard rubber plate, 532 a sealing cover, 533 a soft rubber pad, 534 a vent hole;

[0034] 6 a first sealing member, 61 a first receiving ring, 62 an air bag ring, 63 a soft rubber ring, 64 a closing member, 65 a conveying pipe;

[0035] 641 a soft rubber block, 642 a metal reinforcing strip, 643 a metal friction plate, 644 a thin rubber pad;

[0036] 7 a conveying member, 71 a placing groove, 72 a conveying channel, 73 a conveying hole, 74 a piston block, 75 a second receiving ring;

[0037] 8 a second sealing member, 81 a water bag ring, 82 a rubber ring, 83 a sticking rubber patch, 84 a limiting plate, 85 a smooth metal sheet;

[0038] 9 a protective member, 91 a hard rubber ring, 92 a connecting plastic ring, 93 a rubber skirt, 94 a metal elastic strip, 95 a plugging groove. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0040] Reference Figure 1A kind of automobile piston rod detection mechanism, including air tightness detection equipment 1, oil cylinder 3 and two connecting heads 4 respectively installed on oil cylinder 3, especially, air tightness detection equipment 1 includes the following contents: forming sealed space: test fixture (sealing element, clamping mechanism, cavity), provide and control pressure: pressure source, filter pressure regulating system, valve, accurate state perception: high-precision pressure sensor, flow sensor (optional), command and decision: control system (PLC / industrial computer), man-machine communication: HMI (touch screen / display), safety guarantee: safety protection device, more need to pay attention to, air tightness detection equipment 1 is prior art, here does not too much statement, piston rod is installed on oil cylinder 3 simultaneously and carries out sealing detection, to ensure the quality of piston rod, and oil cylinder 3 and connecting head 4 are all prior art in this technical field, here does not too much statement.

[0041] With reference to Figure 1 , Figure 2 and Figure 3 Air tightness detection equipment 1 is installed with the load-bearing piece 2 that can bear oil cylinder 3, load-bearing piece 2 includes the two guide rails 21 of being arranged on air tightness detection equipment 1, two guide rails 2 are equipped with the two load-bearing plates 22 matched with it, especially, the specific connection structure of guide rail 21 and load-bearing plate 22 is as follows: the guide block matched with guide rail is integrally formed and connected on load-bearing plate 22, and the guide block can make load-bearing plate 22 move on guide rail 21, load-bearing plate 22 is installed with two groups of fixed plates, and the two groups of fixed plates are all screw-connected with adjusting knob, when staff turns adjusting knob, the screw rod on adjusting knob can be moved downwards, further can make screw rod and guide rail 21 contact, further can make load-bearing plate 22 be fixed, air tightness detection equipment 1 can also be installed with electric guide rail and guide block, wherein the guide block can be connected with one of load-bearing plate 22, which can facilitate staff to move the position of one of load-bearing plate 22, so that the device can adapt to different models of oil cylinder 3, air tightness detection equipment 1 is equipped with strip-shaped opening, and strip-shaped opening is located at the side below two guide rails 21, which can ensure that the air inlet pipe 24 on load-bearing plate 22 is not blocked, further ensures that gas can enter into vertical cylinder 23, so as to ensure the normal use of the device.

[0042] With reference to Figure 3 , Figure 4 and Figure 5The vertical cylinder 23 is provided with the air inlet pipe 24 screwed thereon, and the air inlet pipe 24 is connected with the external air source, so that the air can enter the vertical cylinder 23, and the air inlet one-way pipe 25 is provided on the side wall of the vertical cylinder 23, and the air inlet one-way pipe 25 comprises a pipe and a one-way valve, so that the external air can enter the vertical cylinder 23 through the pipe and the one-way valve, and the air in the vertical cylinder 23 cannot leak out, and the pressure relief pipe 26 is provided on the vertical cylinder 23, and the pressure relief pipe 26 also comprises a pipe and a pressure relief valve, so that when the air pressure in the vertical cylinder 23 is relatively large, the pressure relief valve can discharge the air in the vertical cylinder 23, so that the piston plate 52 can normally move, so that the device can adapt to different types of oil cylinders 3, so as to ensure the normal use of the device.

[0043] With reference to Figure 5 and Figure 6 , the air source member 5 comprises the insertion pipe 51 integrally installed on the inner bottom of the vertical cylinder 23, wherein when the external air enters or is discharged from the vertical cylinder 23, the air first flows into the insertion pipe 51 and then flows to the outside, and the piston plate 52 is arranged in the vertical cylinder 23, the piston plate 52 is sleeved on the insertion pipe 51, and the piston plate 52 and the insertion pipe 51 are in sliding sealing connection, the piston plate 52 is connected with the sealing member 53, the connecting pipe 4 is in contact with the lower end of the sealing member 53, the lower end of the piston plate 52 is fixedly connected with the spring 54 connected with the inner bottom of the vertical cylinder 23, and the lower portion of the piston plate 52 and the vertical cylinder 23 form the air cavity 55.

[0044] With reference to Figure 6 and Figure 7 , the sealing member 53 comprises the hard rubber plate 531 fixedly connected to the piston plate 52, the upper end of the hard rubber plate 531 is bonded with the sealing cover 532, the sealing cover 532 and the hard rubber plate 531 are filled with water, and the water filling amount is 70%, and the sealing cover 532 is fixedly connected with the soft rubber pad 533, the soft rubber pad 533 is provided with a plurality of air holes 534, and the plurality of air holes 534 are arranged in the soft rubber pad 533 and are connected and arranged through the air conveying passages, so that when the soft rubber pad 533 is extruded, the air in the soft rubber pad 533 can be discharged under the assistance of the air holes, and the connecting pipe 4 can be more tightly attached.

[0045] With reference to Figure 6 and Figure 8The first sealing member 6 comprises a first receiving ring 61 sleeved on the insertion tube 51, and the first receiving ring 61 is above the piston plate 52. The first receiving ring 61 is provided with an air bag ring 62. The air bag ring 62 is a U-shaped plastic film. One end of the U-shaped plastic film is adhered to the inner side wall of the first receiving ring 61, and the other end of the U-shaped plastic film is adhered to the inner side wall of the first receiving ring 61. The air bag ring 62 is fixedly connected with two soft rubber rings 63. The two soft rubber rings 63 are thin and elastic. The two soft rubber rings 63 are fixedly connected with two sealing members 64. The first receiving ring 61 is provided with two delivery tubes 65 which are in communication with the air bag ring 62. The lower ends of the two delivery tubes 65 pass through the side wall of the piston plate 52 and extend into the air cavity 55.

[0046] With reference to Figure 8 and Figure 9 The sealing member 64 comprises a plurality of soft rubber blocks 641 adhered to the side wall of the soft rubber ring 63. The plurality of soft rubber blocks 641 are divided into two groups and arranged in an upper and lower manner. The plurality of soft rubber blocks 641 are arranged in an upper and lower staggered manner. The plurality of soft rubber blocks 641 are provided with metal reinforcing strips 642. The side wall of the soft rubber block 641 is fixedly connected with a metal friction plate 643. When the metal friction plate 643 is in contact with the connecting head 4, the metal friction plate 643 can increase the stability of the connecting head 4 and further increase the stability of the oil cylinder 3. The side wall of the soft rubber block 641 is fixedly connected with a plurality of thin rubber pads 644. The thin rubber pad 644 is thin in size, which can reduce the gap between the two soft rubber blocks 641 and further increase the sealing performance of the device.

[0047] With reference to Figure 10 and Figure 11 The delivery member 7 comprises a placing groove 71 arranged on the inner side wall of the vertical cylinder 23. The vertical cylinder 23 is provided with two symmetrical delivery channels 72 which are in communication with the placing groove 71. The delivery channels 72 are filled with water. The side wall of the delivery channel 72 is provided with a delivery hole 73. The delivery channel 72 is in communication with the air cavity 55 through the delivery hole 73. The delivery channel 72 is provided with a piston block 74 matched therewith. The placing groove 71 is provided with a second receiving ring 75 matched therewith.

[0048] With reference to Figure 10 and Figure 11The second sealing member 8 comprises a water bag ring 81 arranged on the inner side wall of the second receiving ring 75. It is particularly noted that the structure of the water bag ring 81 is consistent with that of the air bag ring 62, which has been described above and will not be described herein again. The water bag ring 81 is connected to the two connecting pipes and the two conveying channels 72, so that the water source in the conveying channel 72 can enter the water bag ring 81 through the connecting pipes, thereby ensuring the normal use of the water bag ring 81. A plurality of rubber rings 82 are fixedly connected to the side wall of the water bag ring 81. The number of the rubber rings 82 in one group is four, and the plurality of rubber rings 82 are arranged in an annular array on the side wall of the water bag ring 81. The plurality of rubber rings 82 are arranged in a staggered manner, and the side wall of each rubber ring 82 is fixedly connected to a rubber adhesive patch 83. A plurality of limiting plates 84 are fixedly connected to the side wall of the second receiving ring 75. The end surface of each limiting plate 84 is fixedly connected to a smooth metal sheet 85 in contact with the water bag ring 81.

[0049] With reference to Figure 10 and Figure 12 , the protective member 9 comprises a hard rubber ring 91 fixedly connected to the upper end surface of the vertical pipe 23. The upper end surface of the hard rubber ring 91 is fixedly connected to a connecting plastic ring 92. The upper end surface of the connecting plastic ring 92 is fixedly connected to a rubber skirt 93. A plurality of metal elastic strips 94 are arranged at the connection between the connecting plastic ring 92 and the rubber skirt 93. A plurality of blocking grooves 95 are arranged on the end surface of the rubber skirt 93.

[0050] When the staff needs to use the device, with reference to the description of the accompanying drawings Figure 1 and the description of the accompanying drawings Figure 2 , the staff can move the position of one of the bearing plates 22, so that the device can adapt to different types of oil cylinders 3. When the staff rotates the adjusting knob, the screw rod on the adjusting knob can move downward, further enabling the screw rod to be in contact with the guide rail 21, and further enabling the bearing plate 22 to be fixed. With reference to the description of the accompanying drawings Figure 2 and the description of the accompanying drawings Figure 3 , first, the staff can insert the connecting head 4 on the oil cylinder 3 to be detected into the vertical cylinder 23. Then, the staff starts the hydraulic cylinder on the bearing plate 22, and the output end of the hydraulic cylinder is provided with a rubber head. Thus, when the hydraulic cylinder works, the rubber head can press the oil cylinder 3, further enabling the oil cylinder 3 to be fixed. It is particularly noted that after the oil cylinder 3 is fixed, the staff can press the start button, so that the device can detect the oil cylinder 3. After the detection is completed, the staff can remove the oil cylinder 3 and continue to detect the next oil cylinder 3.

[0051] More specific steps are: when the connector 4 is subjected to the pressure of the hydraulic cylinder and moves down, the connector 4 will contact the soft rubber pad 533 at this time, and the soft rubber pad 533 will be extruded, and the vent hole 534 can make the gas in the soft rubber pad 533 quickly exhaust, further make the soft rubber pad 533 more fit the connector 4, further avoid the gas from the joint between the connector 4 and the soft rubber pad 533, and because the sealing cover 532 is filled with water, which can make the soft rubber pad 533 more fit the connector 4, further ensure the sealing of the connector 4 and the plugging piece, so as to avoid the gas leakage.

[0052] When the connector 4 continues to move down, the piston plate 52 will be affected by the connector 4 and move down, which can make the gas in the air cavity 55 enter the conveying pipe 65, and when the gas enters the conveying pipe 65, the gas enters the air bag ring 62, and when the gas enters the air bag ring 62, the air bag ring 62 expands, which can make the soft rubber block 641 on the soft rubber ring 63 contact the inner side wall of the connector 4, and especially note that the metal reinforcing rib 642 can increase the stability of the soft rubber block 641, and the metal friction plate 643 can increase the friction between the connector 4 and the soft rubber block 641, further ensure the stability of the connector 4, and especially note that the positions of the two groups of soft rubber blocks 641 are staggered up and down, which can effectively avoid the leakage of gas, and the soft rubber pad 644 is a rubber pad with a narrow width, which can further increase the sealing effect between the adjacent two soft rubber blocks 641, further avoid the leakage of gas, and also can make the device adapt to different diameters of the connector 4, further ensure the normal use of the device.

[0053] Then, when the piston plate 52 moves, the gas in the air cavity 55 will enter the conveying channel 72 through the conveying hole 73, which can make the piston block 74 move, and when the piston block 74 moves, the water source enters the water bag ring 81, which can make the adhesive rubber 83 on the rubber ring 82 adhere to the outer side wall of the connector 4, and especially note that the adhesive rubber 83 can be made of rubber material with certain adhesion, which can effectively avoid the leakage of gas, and the setting of the limiting plate 84 and the smooth metal sheet 85 can not only support the water bag ring 81, but also limit the water bag ring 81, further ensure the normal use of the water bag ring 81, and also can make the second sealing piece 8 adhere to the connector 4, further avoid the leakage of gas, thereby ensuring the accuracy of detection.

[0054] Finally, when the oil cylinder 3 is pressed on the vertical cylinder 23, at this time, the rubber skirt 93 can be effectively attached to the joint of the oil cylinder 3 and the vertical cylinder 23 with the assistance of the metal elastic strip 94, further capable of avoiding the leakage of gas, and the plurality of sealing grooves 95 can effectively prevent the leakage of gas, further ensuring the air tightness of the device, indirectly improving the accuracy of the device detection.

[0055] Finally, it should be pointed out that: first, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0056] Secondly: the drawings of the disclosed embodiments of the present application only involve the structures related to the disclosed embodiments, other structures can refer to the usual design, and in the case of no conflict, the same embodiment and different embodiments of the present application can be combined with each other;

[0057] Finally: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automobile piston rod detection mechanism, comprising: an air tightness detection device (1); a bearing (2) mounted on the air tightness detection device (1) for fixing an oil cylinder (3), characterized in that: the bearing (2) comprises two guide rails (21), a bearing plate (22) slidably arranged on the guide rails (21), and a vertical cylinder (23) penetrating through the bearing plate (22); an air source member (5) arranged in the vertical cylinder (23) comprises a spigot (51) fixed to the bottom of the vertical cylinder (23); a first sealing member (6) sleeved on the spigot (51) for sealing the inner side of an oil cylinder connector (4); a second sealing member (8) arranged on the side wall of the vertical cylinder (23) for sealing the outer side of the oil cylinder connector (4); a protective member (9) arranged on the upper end of the vertical cylinder (23) for blocking the gap between the oil cylinder (3) and the vertical cylinder (23).

2. The automotive piston rod detection mechanism of claim 1, wherein: The bearing (2) comprises two guide rails (21) arranged on the air tightness detection device (1), two bearing plates (22) matched with the guide rails (2), and a vertical cylinder (23) penetrating through the bearing plate (22), wherein a gas inlet pipe (24) is threadedly mounted on the vertical cylinder (23), a gas inlet one-way pipe (25) penetrates through the side wall of the vertical cylinder (23), and a pressure relief pipe (26) penetrates through the vertical cylinder (23).

3. The automotive piston rod detection mechanism of claim 2, wherein: The air source member (5) comprises a spigot (51) integrally arranged in the bottom of the vertical cylinder (23), wherein a piston plate (52) is arranged in the vertical cylinder (23), the piston plate (52) is sleeved on the spigot (51), the piston plate (52) and the spigot (51) are in sliding sealing connection, a sealing member (53) is connected to the piston plate (52), the connecting pipe (4) is in contact with the lower end of the sealing member (53), the lower end of the piston plate (52) is fixedly connected with a spring (54) connected with the bottom of the vertical cylinder (23), and the lower part of the piston plate (52) and the vertical cylinder (23) form an air cavity (55).

4. The automotive piston rod detection mechanism of claim 3, wherein: The sealing member (53) comprises a hard rubber plate (531) fixedly connected to the piston plate (52), the upper end of the hard rubber plate (531) is bonded with a sealing cover (532), the sealing cover (532) and the hard rubber plate (531) are filled with a water source, the upper end of the sealing cover (532) is fixedly connected with a soft rubber pad (533), and the soft rubber pad (533) is provided with a plurality of air holes (534).

5. The automotive piston rod detection mechanism of claim 3, wherein: The first sealing member (6) comprises a first receiving ring (61) sleeved on the spigot (51), and the first receiving ring (61) is above the piston plate (52), the first receiving ring (61) is provided with an air bag ring (62), the side wall of the air bag ring (62) is fixedly connected with two soft rubber rings (63), the two soft rubber rings (63) are fixedly connected with two closing members (64), two delivery pipes (65) penetrating through the first receiving ring (61) are arranged in communication with the air bag ring (62), and the lower ends of the two delivery pipes (65) respectively pass through the side wall of the piston plate (52) and extend into the air cavity (55).

6. A mechanism for detecting a piston rod of an automobile according to claim 5, characterized in that: The closure (64) comprises a plurality of soft rubber blocks (641) adhered to the sidewall of the soft rubber ring (63), a metal reinforcing strip (642) is arranged through each of the soft rubber blocks (641), a metal friction plate (643) is fixedly connected to the sidewall of each of the soft rubber blocks (641), and a plurality of thin rubber pads (644) are fixedly connected to the sidewall of each of the soft rubber blocks (641).

7. The automotive piston rod detection mechanism of claim 2, wherein: The conveying member (7) comprises a placing groove (71) arranged on the inner sidewall of the vertical cylinder (23), two conveying channels (72) are arranged in the vertical cylinder (23) and are symmetrically arranged and communicated with the placing groove (71), the conveying channels (72) are filled with water sources, conveying holes (73) are arranged on the sidewalls of the two conveying channels (72), the two conveying channels (72) are communicated with the air cavity (55) through the conveying holes (73), the two conveying channels (72) are provided with piston blocks (74) matched therewith, and the placing groove (71) is provided with a second containing ring (75) matched therewith.

8. The automotive piston rod detection mechanism of claim 7, wherein: The second sealing member (8) comprises a water bag ring (81) arranged on the inner sidewall of the second containing ring (75), the water bag ring (81) is communicated with the two conveying channels (72) through two connecting pipes, the sidewall of the water bag ring (81) is fixedly connected with a plurality of rubber rings (82), the sidewall of each of the rubber rings (82) is fixedly connected with a rubber adhesive plaster (83), the sidewall of the second containing ring (75) is fixedly connected with a plurality of symmetric limiting plates (84), and the end surface of each of the limiting plates (84) is fixedly connected with a smooth metal sheet (85) in contact with the water bag ring (81).

9. The automotive piston rod detection mechanism of claim 2, wherein: The protection member (9) comprises a hard rubber ring (91) fixedly connected to the upper end surface of the vertical pipe (23), the upper end surface of the hard rubber ring (91) is fixedly connected with a connecting plastic ring (92), the upper end surface of the connecting plastic ring (92) is fixedly connected with a rubber skirt (93), a plurality of metal elastic strips (94) are arranged at the connecting position of the connecting plastic ring (92) and the rubber skirt (93), and a plurality of plugging grooves (95) are arranged on the end surface of the rubber skirt (93).

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