Shock absorber check valve leakage test device and test method

Abstract

Shock absorber check valve leakage test device, including installation on the test assembly of workbench, located in the workbench bottom pressure maintaining gas tank and located above the pressure gauge assembly of workbench;Test assembly includes fixed seat, installation on the check valve connector of fixed seat, check valve inflation head and telescopic device;Check valve connector is detachably installed on the fixed seat, and the end towards the check valve inflation head can install check valve for leakage test;Check valve inflation head is connected to the telescopic end of telescopic device, and can be in contact with check valve in the telescopic device extension state.The invention makes the most important inflation process in the test process through automation, ensures the accuracy of inflation docking and the consistency of the test process;Install multiple check valve connectors, which can improve test efficiency;Through the compression of the gas in the check valve by the booster cylinder, the test standard can be improved;The booster cylinder also has a pressure relief function, which can make the check valve more easily disassembled and the disassembly process more secure.

Description

Technical Field

[0001] This invention relates to the field of automotive shock absorber testing apparatus and testing methods, and more specifically to a shock absorber one-way valve leakage testing apparatus and a testing method for the shock absorber one-way valve. Background Technology

[0002] Shock absorbers are crucial components in automobiles, widely used in suspension systems. They dampen vibrations between the chassis and body, improving ride comfort. The one-way valve, as a critical component of the shock absorber, plays a vital role in its performance; therefore, leakage testing is performed before installation. Current testing methods typically involve inflating the one-way valve and placing it in a water basin to observe for bubbles. Bubbles indicate leakage, but this process is time-consuming and inefficient. Furthermore, the valve's opening and closing during inflation inevitably leads to a small amount of gas leakage, causing a pressure drop. This uncontrollable pressure drop lowers the test standard and results in inconsistencies between different one-way valves. Additionally, the residual pressure after testing makes disassembly difficult and increases the risk of the valve popping out under pressure, posing a safety hazard. Therefore, in order to improve product capacity, ensure product quality, and guarantee production safety, it is particularly important to design a shock absorber one-way valve leakage test device or a test method for such a device that is highly efficient, has high testing standards and consistency, and ensures a safe testing process. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a shock absorber one-way valve leakage testing device and a testing method for this device. The device installs a one-way valve onto a one-way valve connector, which is then precisely positioned on a fixed base. Inflation is achieved by an inflation head that moves along the axis and abuts against the inlet of the one-way valve. This automates the crucial inflation process, ensuring accuracy and consistency in the testing process. Furthermore, multiple one-way valve connectors allow for replacement after one set of valves has been inflated. Each connector is monitored by a corresponding pressure gauge, improving testing efficiency. A pressure booster cylinder compresses the gas inside the one-way valve, restoring the pressure to the test pressure or even higher, thereby enhancing testing standards and ensuring optimal results. The pressure booster cylinder also features a pressure relief function, releasing internal pressure before disassembly, making disassembly easier and safer.

[0004] The specific technical solution of the present invention is as follows: a shock absorber one-way valve leakage test device, comprising a test component mounted on a workbench, a pressure-holding gas tank located at the bottom of the workbench, and a pressure gauge component located above the workbench; the test component comprises a fixed base, a one-way valve connector mounted on the fixed base, a one-way valve inflation head, and a telescopic device; the one-way valve connector is detachably mounted on the fixed base, and a one-way valve can be installed at the end facing the one-way valve inflation head for leakage testing; the one-way valve inflation head is connected to the telescopic end of the telescopic device, and can abut against the one-way valve in the test state when the telescopic device is extended.

[0005] Therefore, the one-way valve is installed on the one-way valve connector, and the one-way valve connector is fixed on the fixed seat, which ensures that the one-way valve is accurately positioned and firmly fixed. The one-way valve inflation head abuts against the one-way valve inlet under the extension and retraction of the telescopic device. Under the limiting action of the fixed seat, the one-way valve inflation head can accurately connect with the one-way valve port to form a seal, ensuring that no leakage occurs during inflation. After inflation reaches the test pressure, the one-way valve inflation head returns to its original position under the extension and retraction of the telescopic device, and the one-way valve closes to form a pressure holding position. The sealing performance of the one-way valve can be tested by detecting the change in air pressure inside the one-way valve or by placing the one-way valve in liquid to observe whether bubbles emerge. The most important inflation process in the test is automated, which can ensure the accuracy of inflation connection and the consistency of the test process.

[0006] As a preferred embodiment of the present invention, the fixing base includes a fixing base plate, a one-way valve fixing support, a one-way valve fixing pressure block, and a one-way valve fixing telescopic cylinder; the one-way valve fixing support is connected above the fixing base plate, and the upper surface of the one-way valve fixing support is provided with a positioning groove for inserting the one-way valve connector; the one-way valve fixing telescopic cylinder is connected to the side of the one-way valve fixing support, and the telescopic end of the one-way valve fixing telescopic cylinder is connected to the one-way valve fixing pressure block, and the one-way valve fixing pressure block has an opening and closing action with the positioning groove under the telescopic action of the one-way valve fixing telescopic cylinder.

[0007] Therefore, after the one-way valve connector is placed in the positioning groove, the one-way valve fixing block is pressed down under the action of the one-way valve fixing telescopic cylinder, which can firmly install the one-way valve connector and make its positioning accurate, and the installation method is simple and reliable.

[0008] As a preferred embodiment of the present invention, the one-way valve connector is a hollow cylinder, and its outer surface is fitted into the positioning groove for installation. A limiting ring is provided at one end of the one-way valve connector and the one-way valve inflation head. The limiting ring is blocked by the side of the one-way valve fixing support and cannot enter the positioning groove. The inner hole of the one-way valve connector at one end of the limiting ring can accommodate the one-way valve, and the inner hole at the other end is connected to the vent pipe.

[0009] Therefore, the limiting ring provided at one end of the one-way valve connector can lock the one-way valve fixing support outside, thereby providing support when the one-way valve inflation head abuts against the one-way valve, and preventing the one-way valve connector from moving axially.

[0010] As a preferred embodiment of the present invention, the one-way valve inflation head includes a cylindrical main body and a conical lifting part. The conical lifting part is located on the end face of the cylindrical main body near the one-way valve. An inflation inlet is provided on the side of the cylindrical main body, and an inflation outlet is provided at the pointed corner of the conical lifting part. The inflation inlet and the inflation outlet are connected.

[0011] Therefore, the surface of the conical jack is made of a flexible sealing material, which allows it to form a seal when it comes into contact with the one-way valve port.

[0012] As a preferred embodiment of the present invention, the inflation inlet is connected to the air outlet of the pressure-holding gas tank via a vent pipe.

[0013] Therefore, the pressure-holding gas tank supplies gas to the one-way valve charging head.

[0014] As a preferred embodiment of the present invention, at least two one-way valve connectors are provided; the pressure gauge assembly includes one-way valve pressure gauges and gas tank pressure gauges, the number of one-way valve pressure gauges is the same as the number of one-way valve connectors, and the number of gas tank pressure gauges is the same as the number of pressure-holding gas tanks; the one-way valve pressure gauges and the one-way valve connectors are connected by an air pipe, and the gas tank pressure gauges and the gas outlet of the pressure-holding gas tanks are connected by an air pipe.

[0015] Therefore, by installing multiple check valve connectors, it is possible to replace and refill a set of check valves after one set of check valves has been inflated. Each check valve connector is monitored by a corresponding check valve pressure gauge, enabling simultaneous leakage testing of multiple sets of check valves. Each pressure-holding gas tank is monitored by a corresponding gas tank pressure gauge, allowing for timely replacement when the gas pressure is insufficient.

[0016] As a preferred embodiment of the present invention, the shock absorber one-way valve leakage test device further includes a booster cylinder, the booster cylinder including a cylinder body, end caps sealed to both ends of the cylinder body, a first piston and a second piston located inside the cylinder body, and a first piston rod and a second piston rod respectively connected to the first piston and the second piston and extending from the end caps at both ends; the end caps are provided with vents, and the vent at one end is connected to the one-way valve connector through an air pipe.

[0017] Therefore, when the one-way valve inflation head resets from the state of being in opposition to the one-way valve, some gas inside the one-way valve will leak, resulting in a decrease in pressure. The booster cylinder can compress the gas inside the one-way valve, thereby restoring the gas pressure to the test pressure, improving the test standard, and ensuring the test effect.

[0018] As a preferred embodiment of the present invention, a first sealing element is installed at the junction of the inner hole of the end cap and the first piston rod and the second piston rod; a second sealing element is installed at the junction of the outer circles of the first piston and the second piston and the inner wall of the cylinder; and a third sealing element for sealing between the two pistons is provided on the side of the first piston and / or the second piston that is close to each other.

[0019] Thus, the first piston and the second piston can form a seal when they abut against each other. When they are in the abutting state, they can move to the cavity on the side connected to the air pipe of the one-way valve inflation head to increase the pressure of the one-way valve inflation head.

[0020] As a preferred embodiment of the present invention, the first piston and the second piston are respectively provided with a first vent hole and a second vent hole, the first vent hole penetrating through both sides of the first piston and the second vent hole penetrating through both sides of the second piston.

[0021] Therefore, the first vent and the second vent are located on the inner and outer sides of the sealing ring formed by the third sealing element, respectively. When the first piston and the second piston abut against each other, air cannot pass between the first vent and the second vent. When the first piston and the second piston separate, the gas in the cavity separated by the first piston and the second piston in the cylinder can flow through the first vent and the second vent, thereby releasing the air pressure. This makes it easier to disassemble the one-way valve without back pressure when it is removed from the one-way valve connector, and the disassembly process is safer.

[0022] The test method for the shock absorber one-way valve leakage test device includes the following steps:

[0023] Step A: Connect the one-way valve to the one-way valve connector and install the one-way valve connector on the one-way valve fixing support. The one-way valve fixing telescopic cylinder works to press down the one-way valve fixing pressure block to press and fix the one-way valve connector.

[0024] Step B: The telescopic device extends, causing the one-way valve inflation head to abut against the one-way valve;

[0025] Step C: The booster cylinder is adjusted to the state where the first piston rod is extended to the bottom and the second piston rod is retracted to the bottom, and the pressure-holding gas tank supplies gas to the one-way valve charging head;

[0026] Step D: When the pressure gauge of the one-way valve corresponding to the one-way valve connector in the inflation state reaches the test pressure, the pressure-holding gas tank stops supplying gas, the telescopic device retracts, and the one-way valve inflation head separates from the one-way valve.

[0027] Step E: The action of the one-way valve fixing telescopic cylinder causes the one-way valve fixing pressure block to rise, releasing the one-way valve connector. The one-way valve connector and the one-way valve, which are in the connected state, are removed from the one-way valve fixing support and placed in the water basin.

[0028] Step F: Drive the first piston rod to retract inward, so that the first piston and the second piston are in contact and move towards the second piston rod, so that the pressure gauge of the one-way valve corresponding to the one-way valve connector reaches the enhanced test air pressure and then stops, and perform a pressure test on the one-way valve;

[0029] Step G: After the test is completed, drive the second piston rod to retract inward, so that the first piston and the second piston are in contact and move to the end in the direction of the first piston rod;

[0030] Step H: Drive the second piston rod to extend outward a certain distance, so that the first piston and the second piston separate and release pressure;

[0031] Step I: Disconnect the one-way valve from the one-way valve connector, and then repeat Step A.

[0032] Therefore, the first piston rod and the second piston rod are driven by a device with greater thrust, such as a lead screw, an electric push rod, or a hydraulic cylinder; the enhanced test air pressure can be the same as the test air pressure, or it can be greater than or less than the test air pressure, depending on the product test standards and performance requirements; when executing step E, another set of the one-way valve and the one-way valve connector can be used to execute step A simultaneously, thereby improving work efficiency.

[0033] In summary, the present invention has the following beneficial effects:

[0034] The shock absorber one-way valve leakage testing device of this invention installs the one-way valve on the one-way valve connector, and then fixes the one-way valve connector on the fixed base for precise positioning. Inflation is achieved by the one-way valve inflation head, which moves along the axis, abutting against the one-way valve inlet. This automates the crucial inflation process, ensuring the accuracy of inflation connection and the consistency of the testing process. Furthermore, by installing multiple one-way valve connectors, a new set of one-way valves can be replaced after inflation. Each connector is monitored by a corresponding one-way valve pressure gauge, improving testing efficiency. A booster cylinder compresses the gas inside the one-way valve, restoring the pressure to the test pressure, or even achieving a higher booster test pressure, thereby improving testing standards and ensuring test results. The booster cylinder also has a pressure relief function, releasing internal pressure before disassembly of the one-way valve, making disassembly easier and safer. Attached Figure Description

[0035] Figure 1 This is a perspective view of the shock absorber one-way valve leakage test device of the present invention;

[0036] Figure 2 This is a perspective view of the test components of the shock absorber one-way valve leakage test device of the present invention;

[0037] Figure 3 This is a perspective view of the shock absorber one-way valve leakage test device of the present invention, with the one-way valve installed on the test assembly;

[0038] Figure 4 This is a cross-sectional view of the booster cylinder of the shock absorber one-way valve leakage test device of the present invention;

[0039] Figure 5 This is a flowchart illustrating the operation of the booster cylinder in the shock absorber one-way valve leakage test device of the present invention.

[0040] In the diagram, 1-test component, 11-fixed base, 111-fixed base plate, 112-one-way valve fixing support, 1121-positioning groove, 113-one-way valve fixing block, 114-one-way valve fixing telescopic cylinder, 12-one-way valve connector, 121-limiting ring, 13-one-way valve inflation head, 131-cylindrical main body, 1311-inflation inlet, 132-conical lifting part, 1321-inflation outlet, 14-telescopic device 1-Pressure-holding gas tank; 3-Pressure gauge assembly; 31-One-way valve pressure gauge; 32-Gas tank pressure gauge; 4-One-way valve; 5-Boosting cylinder; 51-Cylinder body; 52-End cap; 521-Vent port; 53-First piston; 531-First vent hole; 54-Second piston; 541-Second vent hole; 55-First piston rod; 56-Second piston rod; 57-First seal; 58-Second seal; 59-Third seal. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1 , Figure 2 , Figure 3 The shock absorber one-way valve leakage test device includes a test component 1 installed on a workbench, a pressure-holding gas tank 2 located at the bottom of the workbench, and a pressure gauge component 3 located above the workbench. The test component 1 includes a fixed base 11, a one-way valve connector 12 installed on the fixed base 11, a one-way valve inflation head 13, and a telescopic device 14. The one-way valve connector 12 is detachably installed on the fixed base 11, and a one-way valve 4 can be installed at the end facing the one-way valve inflation head 13 for leakage testing. The one-way valve inflation head 13 is connected to the telescopic end of the telescopic device 14, and can abut against the one-way valve 4 in the test state when the telescopic device 14 is extended.

[0043] Therefore, the one-way valve 4 is installed on the one-way valve connector 12, and the one-way valve connector 12 is fixed on the fixing seat 11, which can ensure that the one-way valve 4 is accurately positioned and firmly fixed. The one-way valve inflation head 13 abuts against the inlet of the one-way valve 4 under the extension and retraction of the telescopic device 14. Under the limiting action of the fixing seat 11, the one-way valve inflation head 13 can accurately connect with the valve port of the one-way valve 4 to form a seal, ensuring that no leakage occurs during inflation. After inflation reaches the test pressure, the one-way valve inflation head 13 returns to its original position under the extension and retraction of the telescopic device 14, and the one-way valve 4 closes to form a pressure holding. The sealing performance of the one-way valve 4 can be tested by detecting the change of air pressure inside the one-way valve 4 or by placing the one-way valve 4 in liquid to observe whether bubbles emerge. The most important inflation process in the test is realized through automation, which can ensure the accuracy of inflation docking and the consistency of the test process.

[0044] like Figure 2 , Figure 3 The fixed base 11 includes a fixed base plate 111, a one-way valve fixed support 112, a one-way valve fixed pressure block 113, and a one-way valve fixed telescopic cylinder 114. The one-way valve fixed support 112 is connected above the fixed base plate 111, and the upper surface of the one-way valve fixed support 112 is provided with a positioning groove 1121 for inserting the one-way valve connector 12. The one-way valve fixed telescopic cylinder 114 is connected to the side of the one-way valve fixed support 112, and the telescopic end of the one-way valve fixed telescopic cylinder 114 is connected to the one-way valve fixed pressure block 113. Under the telescopic action of the one-way valve fixed telescopic cylinder 114, the one-way valve fixed pressure block 113 has an opening and closing action with the positioning groove 1121.

[0045] Therefore, after the one-way valve connector 12 is placed in the positioning groove 1121, the one-way valve fixing block 113 is pressed down under the action of the one-way valve fixing telescopic cylinder 114, which can firmly install the one-way valve connector 12 and make its positioning accurate, and the installation method is simple and reliable.

[0046] like Figure 2 , Figure 3 The one-way valve connector 12 is a hollow cylinder. Its outer surface fits into the positioning groove 1121 for installation. The one-way valve connector 12 and the one-way valve inflation head 13 are provided with a limiting ring 121 at one end. The limiting ring 121 is blocked by the side of the one-way valve fixing support 112 and cannot enter the positioning groove 1121. The inner hole of the one-way valve connector 12 at one end of the limiting ring 121 can be used to install the one-way valve 4, and the inner hole at the other end is connected to the vent pipe.

[0047] Therefore, the limiting ring 121 provided at one end of the one-way valve connector 12 can make the limiting ring 121 lock on the outside of the one-way valve fixing support 112, thereby providing support force when the one-way valve inflation head 13 abuts against the one-way valve 4, and preventing the one-way valve connector 12 from moving axially.

[0048] like Figure 2 , Figure 3 The one-way valve inflation head 13 includes a cylindrical main body 131 and a conical lifting part 132. The conical lifting part 132 is located on the end face of the cylindrical main body 131 near the one-way valve 4. The cylindrical main body 131 has an inflation inlet 1311 on its side and an inflation outlet 1321 at the tip of the conical lifting part 132. The inflation inlet 1311 and the inflation outlet 1321 are connected.

[0049] Therefore, the surface of the conical top 132 is made of flexible sealing material, which allows it to form a seal when it comes into contact with the valve port of the one-way valve 4.

[0050] The air inlet 1311 is connected to the air outlet of the pressure-holding air tank 2 through a vent pipe.

[0051] Therefore, the pressure-holding gas tank 2 supplies gas to the one-way valve charging head 13.

[0052] like Figure 1 , Figure 2 , Figure 3 The check valve connector 12 is provided with at least two; the pressure gauge assembly 3 includes a check valve pressure gauge 31 and a gas tank pressure gauge 32. The number of check valve pressure gauges 31 is the same as the number of check valve connectors 12, and the number of gas tank pressure gauges 32 is the same as the number of pressure-holding gas tanks 2; the check valve pressure gauge 31 and the check valve connector 12 are connected by an air pipe, and the gas tank pressure gauge 32 and the gas outlet of the pressure-holding gas tank 2 are connected by an air pipe.

[0053] Therefore, by installing multiple one-way valve connectors 12, it is possible to replace one set of one-way valves 4 after they have been inflated and then inflated again. Each one-way valve connector 12 is monitored by a corresponding one-way valve pressure gauge 31, which can simultaneously perform leakage tests on multiple sets of one-way valves 4. Each pressure-holding gas storage tank 2 is monitored by a corresponding gas storage tank pressure gauge 32, which can be replaced in time when the gas pressure is insufficient.

[0054] like Figure 4 The shock absorber one-way valve leakage test device also includes a booster cylinder 5. The booster cylinder 5 includes a cylinder body 51, end caps 52 sealed to both ends of the cylinder body 51, a first piston 53 and a second piston 54 located inside the cylinder body 51, and a first piston rod 55 and a second piston rod 56 respectively connected to the first piston 53 and the second piston 54 and extending from the end caps 52 at both ends. A vent 521 is provided on the end cap 52, and the vent 521 at one end is connected to the one-way valve connector 12 through an air pipe.

[0055] Therefore, when the one-way valve inflation head 13 resets from the state of being in opposition to the one-way valve 4, some gas inside the one-way valve 4 will leak, resulting in a decrease in pressure. The booster cylinder 5 can compress the gas inside the one-way valve 4, thereby restoring the gas pressure to the test pressure, improving the test standard, and ensuring the test effect.

[0056] like Figure 4 A first seal 57 is installed at the junction of the inner hole of the end cap 52 and the first piston rod 55 and the second piston rod 56; a second seal 58 is installed at the junction of the outer circle of the first piston 53 and the second piston 54 and the inner wall of the cylinder body 51; a third seal 59 for sealing between the two pistons is provided on the side of the first piston 53 and / or the second piston 54 that are close to each other.

[0057] Thus, the first piston 53 and the second piston 54 can form a seal when they come into contact. When they are in contact, they can move to the side of the cavity connected to the air pipe of the one-way valve inflation head 13 to increase the pressure of the one-way valve inflation head 13.

[0058] like Figure 4 The first piston 53 and the second piston 54 are respectively provided with a first vent hole 531 and a second vent hole 541. The first vent hole 531 passes through both sides of the first piston 53, and the second vent hole 541 passes through both sides of the second piston 54.

[0059] Therefore, the first vent 531 and the second vent 541 are located on the inner and outer sides of the sealing ring formed by the third sealing element 59, respectively. When the first piston 53 and the second piston 54 abut against each other, air cannot pass between the first vent 531 and the second vent 541. When the first piston 53 and the second piston 54 separate, the gas in the cavity separated by the first piston 53 and the second piston 54 in the cylinder 51 can flow through the first vent 531 and the second vent 541, thereby releasing the air pressure. This makes it easier to disassemble the one-way valve 4 from the one-way valve connector 12 without back pressure, and the disassembly process is safer.

[0060] like Figure 5 The test method for the shock absorber one-way valve leakage test device includes the following steps:

[0061] Step A: Connect the one-way valve 4 to the one-way valve connector 12, and install the one-way valve connector 12 on the one-way valve fixing support 112. The one-way valve fixing telescopic cylinder 114 works to press down the one-way valve fixing pressure block 113 to press and fix the one-way valve connector 12.

[0062] Step B: The telescopic device 14 extends, causing the one-way valve inflation head 13 to abut against the one-way valve 4;

[0063] Step C: The booster cylinder 5 is adjusted so that the first piston rod 55 is extended to the bottom and the second piston rod 56 is retracted to the bottom, and the pressure-holding gas tank 2 supplies gas to the one-way valve charging head 13;

[0064] Step D: When the pressure gauge 31 of the one-way valve corresponding to the one-way valve connector 12 in the inflation state reaches the test pressure, the pressure-holding gas tank 2 stops supplying gas, the telescopic device 14 retracts, and the one-way valve inflation head 13 separates from the one-way valve 4.

[0065] Step E: The action of the one-way valve fixing telescopic cylinder 114 causes the one-way valve fixing pressure block 113 to be lifted, releasing the one-way valve connector 12. The one-way valve connector 12 and the one-way valve 4 in the connected state are removed from the one-way valve fixing support 112 and placed in the water basin.

[0066] Step F: Drive the first piston rod 55 to retract inward, so that the first piston 53 and the second piston 54 come into contact and move towards the second piston rod 56, so that the pressure gauge 31 of the one-way valve corresponding to the one-way valve connector 12 reaches the enhanced test air pressure and then stops, and perform a pressure test on the one-way valve 4.

[0067] Step G: After the test is completed, drive the second piston rod 56 to retract inward, so that the first piston 53 and the second piston 54 come into contact and move to the end in the direction of the first piston rod 55.

[0068] Step H: Drive the second piston rod 56 to extend outward a certain distance, so that the first piston 53 and the second piston 54 separate and release pressure;

[0069] Step I: Disconnect the one-way valve 4 from the one-way valve connector 12, and then repeat step A.

[0070] Therefore, the first piston rod 55 and the second piston rod 56 are driven by a device with greater thrust, such as a lead screw, electric push rod or hydraulic cylinder; the enhanced test air pressure can be the same as the test air pressure, or it can be greater than or less than the test air pressure, depending on the product test standards and performance requirements; when executing step E, another set of one-way valve 4 and one-way valve connector 12 can be used to execute step A simultaneously, thereby improving work efficiency.

[0071] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. All technical contents for which protection is sought in this invention have been fully described in the claims.

Claims

1. A shock absorber check valve leakage testing device, characterized in that: The test assembly (1) is mounted on a workbench, a pressure-holding gas tank (2) is located at the bottom of the workbench, and a pressure gauge assembly (3) is located above the workbench. The test assembly (1) includes a fixed base (11), a one-way valve connector (12) mounted on the fixed base (11), a one-way valve inflation head (13), and a telescopic device (14). The one-way valve connector (12) is detachably mounted on the fixed base (11), and a one-way valve (4) can be installed at the end facing the one-way valve inflation head (13) for leakage testing. The one-way valve inflation head (13) is connected to the telescopic end of the telescopic device (14), and can abut against the one-way valve (4) in the test state when the telescopic device (14) is extended. The shock absorber one-way valve leakage test device also includes a booster cylinder (5), which includes a cylinder body (51), end caps (52) sealed to both ends of the cylinder body (51), a first piston (53) and a second piston (54) located in the cylinder body (51), and a first piston rod (55) and a second piston rod (56) respectively connected to the first piston (53) and the second piston (54) and extending from the end caps (52) at both ends; the end caps (52) are provided with a vent (521), and the vent (521) at one end is connected to the one-way valve connector (12) through an air pipe.

2. The shock absorber check valve leakage test device according to claim 1, characterized in that: The fixed base (11) includes a fixed base plate (111), a one-way valve fixed support (112), a one-way valve fixed pressure block (113), and a one-way valve fixed telescopic cylinder (114). The one-way valve fixed support (112) is connected above the fixed base plate (111), and the upper surface of the one-way valve fixed support (112) is provided with a positioning groove (1121) for inserting the one-way valve connector (12). The one-way valve fixed telescopic cylinder (114) is connected to the side of the one-way valve fixed support (112), and the telescopic end of the one-way valve fixed telescopic cylinder (114) is connected to the one-way valve fixed pressure block (113). The one-way valve fixed pressure block (113) has an opening and closing action with the positioning groove (1121) under the telescopic action of the one-way valve fixed telescopic cylinder (114).

3. The shock absorber one-way valve leakage test device according to claim 2, characterized in that: The one-way valve connector (12) is a hollow cylinder. Its outer surface is fitted into the positioning groove (1121). The one-way valve connector (12) and the one-way valve inflation head (13) are provided with a limiting ring (121) at one end. The limiting ring (121) is blocked by the side of the one-way valve fixing support (112) and cannot enter the positioning groove (1121). The inner hole of the one-way valve connector (12) at one end of the limiting ring (121) can be used to install the one-way valve (4), and the inner hole at the other end is connected to the vent pipe.

4. The shock absorber one-way valve leakage test device according to claim 3, characterized in that: The one-way valve inflation head (13) includes a cylindrical main body (131) and a conical lifting part (132). The conical lifting part (132) is located on the end face of the cylindrical main body (131) near the one-way valve (4). The cylindrical main body (131) has an inflation inlet (1311) on its side and an inflation outlet (1321) at the pointed corner of the conical lifting part (132). The inflation inlet (1311) and the inflation outlet (1321) are connected.

5. The shock absorber one-way valve leakage test device according to claim 4, characterized in that: The air inlet (1311) is connected to the air outlet of the pressure-holding gas tank (2) through a vent pipe.

6. The shock absorber one-way valve leakage test device according to claim 3, characterized in that: At least two one-way valve connectors (12) are provided; the pressure gauge assembly (3) includes a one-way valve pressure gauge (31) and a gas storage tank pressure gauge (32), the number of one-way valve pressure gauges (31) is the same as the number of one-way valve connectors (12), the number of gas storage tank pressure gauges (32) is the same as the number of pressure-holding gas storage tanks (2); the one-way valve pressure gauges (31) and the one-way valve connectors (12) are connected by a gas pipe, and the gas storage tank pressure gauges (32) and the gas outlet of the pressure-holding gas storage tank (2) are connected by a gas pipe.

7. The shock absorber one-way valve leakage test device according to claim 6, characterized in that: A first seal (57) is installed at the junction of the inner hole of the end cap (52) with the first piston rod (55) and the second piston rod (56); a second seal (58) is installed at the junction of the outer circle of the first piston (53) and the second piston (54) with the inner wall of the cylinder (51); a third seal (59) for sealing between the two pistons is provided on the side of the first piston (53) and / or the second piston (54) that are close to each other.

8. The shock absorber one-way valve leakage test device according to claim 7, characterized in that: The first piston (53) and the second piston (54) are respectively provided with a first vent hole (531) and a second vent hole (541). The first vent hole (531) passes through both sides of the first piston (53), and the second vent hole (541) passes through both sides of the second piston (54).

9. A test method for a shock absorber check valve leakage test device, characterized in that, The shock absorber one-way valve leakage test device according to claim 8 includes the following steps: Step A: Connect the one-way valve (4) to the one-way valve connector (12), and install the one-way valve connector (12) on the one-way valve fixing support (112). The one-way valve fixing telescopic cylinder (114) works to make the one-way valve fixing pressure block (113) press down to press and fix the one-way valve connector (12). Step B: The telescopic device (14) extends, causing the one-way valve inflation head (13) to abut against the one-way valve (4); Step C: The booster cylinder (5) is adjusted so that the first piston rod (55) extends to the bottom and the second piston rod (56) retracts to the bottom, and the pressure-holding gas tank (2) supplies gas to the one-way valve charging head (13); Step D: When the pressure gauge (31) of the one-way valve connector (12) in the inflation state reaches the test pressure, the pressure-holding gas tank (2) stops supplying gas, the telescopic device (14) retracts, and the one-way valve inflation head (13) separates from the one-way valve (4). Step E: The one-way valve fixing telescopic cylinder (114) is activated to lift the one-way valve fixing block (113), release the one-way valve connector (12), and remove the one-way valve connector (12) and the one-way valve (4) from the one-way valve fixing support (112) and place them in the water basin. Step F: Drive the first piston rod (55) to retract inward, so that the first piston (53) and the second piston (54) are in contact and move towards the second piston rod (56), so that the pressure gauge (31) of the one-way valve corresponding to the one-way valve connector (12) reaches the enhanced test air pressure and then stops, and perform a pressure test on the one-way valve (4); Step G: After the test is completed, drive the second piston rod (56) to retract inward, so that the first piston (53) and the second piston (54) are in contact and move to the end in the direction of the first piston rod (55); Step H: Drive the second piston rod (56) to extend outward a certain distance, so that the first piston (53) and the second piston (54) separate and release pressure; Step I: Remove the one-way valve (4) from the one-way valve connector (12), and then repeat step A.

Images