An infinitely adjustable detection device for a piston rod

Abstract

The utility model discloses a kind of stepless adjustable detection devices for piston rod, including filling and discharging control assembly, digital pressure gauge and detection seat, detection seat includes sealing shaft sleeve, sealing rubber ring, compression elastic shaft sleeve, compression screw and cylindrical pin, sealing shaft sleeve has axial cavity, and it is equipped with inflation interface hole in sealing shaft sleeve top, it is equipped with mounting groove in sealing shaft sleeve two ends, it is equipped with positioning hole and connecting hole in sealing shaft sleeve side, positioning hole and connecting hole are all communicated with mounting groove, sealing rubber ring is located at the two ends of axial cavity, compression elastic shaft sleeve is fixed in mounting groove, and it is contacted with sealing rubber ring, compression screw is connected with compression elastic shaft sleeve by positioning hole, filling and discharging control assembly is connected with sealing shaft sleeve by inflation interface hole, digital pressure gauge is installed in filling and discharging control assembly. The detection device of the utility model, its overall structure is simple, easy to operate and use, and widely used, suitable for popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of piston rod detection technology, specifically a steplessly adjustable detection device for piston rods. Background Technology

[0002] Landing gear is an accessory device used by aircraft to support the aircraft and facilitate ground movement during takeoff, landing, or taxiing. As the only component supporting the entire aircraft, it is an indispensable and crucial part. The piston rod, used in the landing gear, plays a central role in the aircraft landing gear system. Its main function is to convert the pressure or tension generated by the hydraulic system into linear motion, driving the retraction and extension of the landing gear, through its connection to the piston. Simultaneously, its cushioning structure absorbs the impact force during landing, protecting the piston rod and landing gear assembly from damage. During the reciprocating motion of the piston, the piston rod maintains the piston's linear trajectory, preventing the piston from deviating from its track due to lateral forces, ensuring the accuracy of landing gear retraction and extension and the stability of mechanical transmission, thus providing guidance and stability. Furthermore, because the piston rod needs to withstand high alternating loads and friction, it requires high strength, high wear resistance, and excellent coaxiality to ensure long-term reliable operation.

[0003] Therefore, when the piston rod moves in a medium of gas, oil, or a mixture of both, the sealing surface of the piston rod, under pressure, can leak air and oil due to defects in its surface treatment quality, such as dimensional inaccuracies, shape tolerances, plating cracks, and plating gaps. This severely affects the functionality of the component and poses a serious safety hazard. For a machined piston rod, its structure is as follows: Figure 1 As shown, before assembly, the surface of the piston rod needs to be inspected for defects to eliminate potential problems. Only piston rods that meet the quality requirements can be installed in the landing gear to ensure reliable operation of the component. Current inspection methods rely primarily on testing instruments, which require segmented testing, resulting in a large workload. To improve efficiency and meet the needs of batch processing, a user-friendly testing device is proposed to meet the piston rod inspection requirements, enabling the inspection of piston rods of the same specifications but different lengths. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the problems existing in the background art, thereby providing a detection device with a simple structure and convenient operation and use. This detection device can detect piston rods of the same specification but different lengths, thereby improving detection efficiency and meeting the needs of batch processing. Specifically, it is a steplessly adjustable detection device for piston rods.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a steplessly adjustable detection device for a piston rod, comprising an inflation / deflation control assembly, a digital display pressure gauge, and a detection seat. The detection seat includes a sealing bushing, a sealing rubber ring, a compression elastic bushing, a clamping screw, and a cylindrical pin. The sealing bushing has an axial cavity, and an inflation port communicating with the axial cavity is provided at the top of the sealing bushing. Mounting grooves matching the compression elastic bushing are provided at both ends of the sealing bushing, and a clamping screw is provided on the side of the sealing bushing. The screw has a matching positioning hole, and the sealing bushing has a connecting hole on its side that matches the cylindrical pin. Both the positioning hole and the connecting hole communicate with the mounting groove. The sealing ring is located at both ends of the axial cavity. The compression elastic bushing is fixed in the mounting groove by the cooperation of the cylindrical pin and the connecting hole, and is in contact with the sealing ring. The clamping screw is abutted against the compression elastic bushing through the positioning hole. The inflation / deflation control assembly is connected to the sealing bushing through the inflation port. The digital display pressure gauge is installed in the inflation / deflation control assembly.

[0006] Furthermore, in the stepless adjustable detection device for piston rod described in this utility model, an inflation valve with a seal or a conical connector interchangeable with the inflation valve is installed at the inflation port in the sealing bushing. The inflation / deflation control assembly is connected to the sealing bushing through the inflation valve or the conical connector.

[0007] Furthermore, in the stepless adjustable detection device for piston rod described in this utility model, an operating handle is also provided on the side of the sealing bushing. There are two operating handles, which are fixed symmetrically in the middle of the two sides of the sealing bushing.

[0008] Furthermore, in the stepless adjustable detection device for piston rod described in this utility model, four clamping screws are provided, and the number of positioning holes corresponds to the number of clamping screws. The four positioning holes are symmetrically arranged on both sides near the top. The clamping screws are screwed into the positioning holes and abut against and contact the compression elastic bushing for fixing the compression elastic bushing in the mounting groove.

[0009] Furthermore, in the stepless adjustable detection device for piston rods described in this utility model, two cylindrical pins are provided, and four connecting holes are provided. The four connecting holes are symmetrically arranged on both sides near the bottom. A through hole matching the cylindrical pin is provided in the compression elastic sleeve. The cylindrical pin passes through the through hole in the compression elastic sleeve and the connecting hole in the sealing sleeve to fix the compression elastic sleeve in the mounting groove.

[0010] Furthermore, in the stepless adjustable detection device for piston rod described in this utility model, the inflation / deflation control assembly employs a control valve with manual adjustment.

[0011] Furthermore, in the stepless adjustable detection device for piston rods described in this utility model, the digital display pressure gauge is a digital display pressure gauge with alarm function.

[0012] The infinitely adjustable testing device for piston rods described in this invention utilizes the axial cavity of a sealing bushing to mount the piston rod to be tested. A sealing ring and a pressure-reducing elastic bushing seal the mounted piston rod, simulating the piston rod surface under air pressure at the seal, whether in a static or dynamic state. Surface defects are determined by observing changes in the digital pressure gauge readings. Compared to existing testing methods, this device offers advantages such as strong intuitiveness and ease of observation. Therefore, the testing device described in this invention can test piston rods of the same specifications but different lengths, greatly improving testing efficiency and meeting the needs of batch processing. Its overall structure is simple, manufacturing cost is low, operation and use are convenient, and its application range is wide, making it suitable for widespread application. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the piston rod structure to be tested;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the conical connector nozzle described in this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the sealing bushing described in this utility model;

[0018] Figure 5 This is a schematic diagram of the detection device described in this utility model during use.

[0019] The figure shows: 1-Inflation / Depression Control Assembly, 2-Digital Display Pressure Gauge, 3-Sealing Bushing, 31-Axial Cavity, 32-Inflation Connector, 33-Mounting Groove, 34-Positioning Hole, 35-Connecting Hole, 4-Sealing Rubber Ring, 5-Pressure Elastic Bushing, 6-Pressure Screw, 7-Cylindrical Pin, 8-Inflation Valve, 9-Conical Connecting Nozzle, 10-Operating Handle. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," and "right" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "provided with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Example 1

[0024] like Figures 2 to 5As shown, this embodiment provides a steplessly adjustable detection device for a piston rod, including a filling / discharging control assembly 1, a digital display pressure gauge 2, and a detection seat. The filling / discharging control assembly 1 uses a control valve with manual adjustment, and the digital display pressure gauge 2 uses a digital display pressure gauge with an alarm function. The detection seat includes a sealing bushing 3, a sealing rubber ring 4, a compression elastic bushing 5, a clamping screw 6, and a cylindrical pin 7. The sealing bushing 3 has an axial cavity 31, and a filling hole 32 communicating with the axial cavity 31 is provided on the top of the sealing bushing 3. Mounting grooves 33 matching the compression elastic bushing 5 are provided at both ends of the sealing bushing 3. The sleeve 3 has a positioning hole 34 on its side that matches the clamping screw 6, and a connecting hole 35 on its side that matches the cylindrical pin 7. Both the positioning hole 34 and the connecting hole 35 are connected to the mounting groove 33. The sealing ring 4 is located at both ends of the axial cavity 31. The compression elastic sleeve 5 is fixed in the mounting groove 33 by the cooperation of the cylindrical pin 7 and the connecting hole 35, and is in contact with the sealing ring 4. The clamping screw 6 is abutted against the compression elastic sleeve 5 through the positioning hole 34. The inflation / deflation control assembly 1 is connected to the sealing sleeve 3 through the inflation port 32. The digital display pressure gauge 2 is installed in the inflation / deflation control assembly 1.

[0025] Furthermore, in order to facilitate connection with the inflation / deflation control assembly 1, an inflation valve 8 with a seal or a conical connector 9 interchangeable with the inflation valve is installed at the inflation port 32 in the sealing bushing 3. The inflation / deflation control assembly 1 is connected to the sealing bushing 3 through the inflation valve 8 or the conical connector 9.

[0026] The continuously adjustable detection device for piston rods provided in this embodiment facilitates the fixing of the compression elastic sleeve 5 disposed in the mounting groove 33. During manufacturing, four clamping screws 6 are provided, and the number of positioning holes 34 corresponds to the number of clamping screws 6. The four positioning holes 34 are symmetrically arranged on both sides near the top. The clamping screws 6 are screwed into the positioning holes 34 and abut against the compression elastic sleeve 5 for fixing the compression elastic sleeve 5 in the mounting groove 33. Two cylindrical pins 7 are provided, and four connecting holes 35 are provided. The four connecting holes 35 are symmetrically arranged on both sides near the bottom. The compression elastic sleeve 5 has a through hole matching the cylindrical pin 7. The cylindrical pin 7 passes through the through hole in the compression elastic sleeve 5 and the connecting hole 35 in the sealing sleeve 3 for fixing the compression elastic sleeve 5 in the mounting groove 33. Example 2

[0027] This embodiment, based on Embodiment 1, utilizes a steplessly adjustable detection device for the piston rod provided in this embodiment to facilitate operation and allow for easy placement of the sealing bushing 3 with the piston rod installed in the oil tank for testing. Two operating handles 10 are provided on the side of the sealing bushing 3, symmetrically fixed to the middle of both sides of the sealing bushing 3. These operating handles 10 on both sides of the sealing bushing 3 facilitate handling with both hands, making operation easier.

[0028] The steplessly adjustable detection device for piston rod described in this utility model can be used interchangeably with the inflation valve 8 or the conical connector 9. In specific applications, depending on the working environment, the inflation valve 8 or the conical connector 9 can be installed at the inflation port 32 in the sealing bushing 3.

[0029] The design principle and usage of the detection device described in this utility model are briefly described below:

[0030] Design principle: This invention simulates the piston rod surface in a static or moving state, with the piston rod surface at the seal under air pressure, to detect whether there are defects on the piston rod surface, thus providing a detection device with digital display for easy observation.

[0031] Usage method: There are two detection methods. Both methods use high-pressure nitrogen as power. The piston rod to be tested is installed in the sealing sleeve 3 in the detection device, and a certain amount of working hydraulic oil is injected into the axial cavity 31 in the sealing sleeve 3. Then, nitrogen is injected from the inflation valve 8 or the conical connector 9.

[0032] The first method: oil tank test (static state). Tighten the clamping screw 6 to make the elastic bushing 5 hold the piston rod tightly to prevent the piston rod from moving linearly during the test. Then, immerse the test device in the oil tank and let it stand for a specified time. Observe whether there are bubbles continuously emerging from both ends of the piston rod. This is to determine whether there are defects on the surface of the piston rod at the seal under air pressure. The specific test location and number of tests can be operated according to actual needs.

[0033] The second method is the pressure holding test (static and dynamic states). Using the configured inflation / deflation control assembly 1 and digital pressure gauge 2, in the static state, the pressure is set as specified. If there is a pressure change, the digital pressure gauge 2 will display the value or an alarm will sound. This is used to determine if there are defects on the piston rod surface at the seal under pressure. When testing different locations, loosen the pressure-retaining elastic sleeve 5 and slowly move the testing device. Use the testing device to make a linear movement on the piston and observe if there is a pressure change. If there is a pressure change, the digital pressure gauge 2 will display the value or an alarm will sound. The specific testing location and number of tests can be determined according to actual needs.

[0034] Therefore, the stepless adjustable detection device for piston rods described in this utility model utilizes the axial cavity 31 in the sealing bushing 3 to install the piston rod to be tested. The piston rod is sealed by the sealing ring 4 and the compression elastic bushing 5. This simulates the piston rod surface under air pressure at the sealing element when it is in a static or moving state. The surface defects of the piston rod are judged by the change in the value of the digital pressure gauge 2. Compared with the existing detection methods, this device has the advantages of being highly intuitive and easy to observe.

[0035] In summary, the detection device described in this utility model can detect piston rods of the same specifications but different lengths, greatly improving detection efficiency and thus meeting the needs of batch processing. Its overall structure is simple, its manufacturing cost is low, its operation and use are convenient, its application range is wide, and it is suitable for widespread application.

[0036] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made using the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steplessly adjustable detection device for a piston rod, comprising a charge / discharge control assembly (1), a digital pressure gauge (2), and a detection base, characterized in that: The testing seat includes a sealing bushing (3), a sealing ring (4), a compression elastic bushing (5), a clamping screw (6), and a cylindrical pin (7). The sealing bushing (3) has an axial cavity (31), and an inflation port (32) communicating with the axial cavity (31) is provided on the top of the sealing bushing (3). Mounting grooves (33) matching the compression elastic bushing (5) are provided at both ends of the sealing bushing (3). Positioning holes (34) matching the clamping screw (6) are provided on the side of the sealing bushing (3), and connecting holes (35) matching the cylindrical pin (7) are provided on the side of the sealing bushing (3). 5) The positioning hole (34) and the connecting hole (35) are both connected to the mounting groove (33). The sealing ring (4) is set at both ends of the axial cavity (31). The compression elastic bushing (5) is fixed in the mounting groove (33) through the cooperation of the cylindrical pin (7) and the connecting hole (35), and is in contact with the sealing ring (4). The clamping screw (6) is abutted against the compression elastic bushing (5) through the positioning hole (34). The inflation and deflation control assembly (1) is connected to the sealing bushing (3) through the inflation port (32). The digital display pressure gauge (2) is installed in the inflation and deflation control assembly (1).

2. The infinitely adjustable detection device for a piston rod according to claim 1, characterized in that: An inflation valve (8) with a seal or a conical connector (9) interchangeable with the inflation valve is installed at the inflation port (32) in the sealing bushing (3). The inflation / deflation control assembly (1) is connected to the sealing bushing (3) via the inflation valve (8) or the conical connector (9).

3. The infinitely adjustable detection device for a piston rod according to claim 2, characterized in that: An operating handle (10) is also provided on the side of the sealing bushing (3). There are two operating handles (10), and the two operating handles (10) are fixed in the middle of the two sides of the sealing bushing (3) in a symmetrical state.

4. The infinitely adjustable detection device for a piston rod according to claim 1, characterized in that: The clamping screw (6) is provided with four screws, and the number of positioning holes (34) corresponds to the number of clamping screws (6). The four positioning holes (34) are symmetrically arranged on both sides near the top. The clamping screw (6) is screwed into the positioning hole (34) and abuts against the compression elastic bushing (5) for fixing the compression elastic bushing (5) in the mounting groove (33).

5. The infinitely adjustable detection device for a piston rod according to claim 1, characterized in that: Two cylindrical pins (7) are provided, and four connecting holes (35) are provided. The four connecting holes (35) are symmetrically arranged on both sides near the bottom. A through hole matching the cylindrical pin (7) is provided in the compression elastic bushing (5). The cylindrical pin (7) passes through the through hole in the compression elastic bushing (5) and the connecting hole (35) in the sealing bushing (3) to fix the compression elastic bushing (5) in the mounting groove (33).

6. The infinitely adjustable detection device for a piston rod according to claim 1, characterized in that: The inflation / deflation control assembly (1) uses a control valve with manual adjustment.

7. The infinitely adjustable detection device for a piston rod according to claim 1, characterized in that: The digital barometer (2) is a digital barometer with alarm function.

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