Device for testing air tightness of pilot-operated solenoid valve

Abstract

The utility model relates to the technical field of pilot-operated solenoid valve detection, in particular to a pilot-operated solenoid valve airtightness test device, which comprises a test gas circuit, a control panel system and a base, the test gas circuit is connected with the base, the control panel system is arranged on the base, and the test gas circuit is connected with the base. The vertical part of the base is provided with a clamping cylinder, a three-position four-way manual rotating valve, a first pressure reducing valve and a second pressure reducing valve, the first pressure reducing valve adjusts a high pressure value, the second pressure reducing valve adjusts a low pressure value, the test gas circuit is divided into two branch gas circuits, and the first branch gas circuit is connected with the clamping cylinder and is used for driving the clamping cylinder to stretch out and draw back and pressing or releasing a tested electromagnetic valve; the second branch gas circuit is connected with a gas circuit inlet of a tested solenoid valve through a first pressure reducing valve, a three-position four-way hand-operated valve and a second pressure reducing valve, high-low pressure gas tightness testing is achieved, the three-position four-way hand-operated valve switches a high-pressure state or a low-pressure state, gas tightness testing requirements under different working conditions are rapidly met, the testing efficiency is improved, and the testing cost is reduced. And test comprehensiveness and reliability are ensured.

Description

Technical Field

[0001] This utility model relates to the field of pilot-operated solenoid valve testing technology, and in particular to a device for testing the airtightness of pilot-operated solenoid valves. Background Technology

[0002] In the field of industrial automation, solenoid valves, as a key actuator, are widely used in various pneumatic control systems. Their performance stability and reliability directly affect the normal operation of the entire system. Airtightness testing of solenoid valves is a core step in ensuring their normal operation, primarily used to assess whether leakage exists under different operating conditions. Pilot-operated solenoid valves, in particular, require precise airtightness testing due to their structural characteristics and working principle, to verify their sealing and operational performance under high and low pressure environments.

[0003] Traditional solenoid valve testing requires testing with high and low air pressures separately. Adjusting the pressure with a pressure reducing valve is time-consuming and affects the efficiency of production testing.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] This invention provides a device for testing the airtightness of a pilot-operated solenoid valve, thereby effectively solving the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a device for testing the air tightness of a pilot-operated solenoid valve, comprising: a test air circuit, a control panel system, and a base. The test air circuit is connected to the base, and the control panel system is disposed on the base. The base includes a horizontal part and a vertical part that are perpendicular to each other. The horizontal part is provided with a test plate assembly, and the vertical part is provided with a clamping cylinder, a three-position four-way manual valve, a first pressure reducing valve, and a second pressure reducing valve. The first pressure reducing valve is used to adjust the high pressure value, and the second pressure reducing valve is used to adjust the low pressure value.

[0007] The test air path is connected to the base and divided into two branch air paths. The first branch air path is connected to the clamping cylinder and is used to drive the extension and retraction of the clamping cylinder to press or release the solenoid valve under test. The second branch air path is connected to the air path inlet of the solenoid valve under test through the first pressure reducing valve, the three-position four-way manual valve and the second pressure reducing valve, and is used for air tightness testing. The three-position four-way manual valve is used to switch the high pressure value or low pressure value state of the second branch air path to realize high and low pressure air tightness testing.

[0008] Furthermore, the first branch air circuit also includes a two-position five-way dual-electro-controlled solenoid valve and a third pressure reducing valve located before the clamping cylinder. The third pressure reducing valve is used to adjust the air pressure entering the clamping cylinder to control the output force of the clamping cylinder. The two-position five-way dual-electro-controlled solenoid valve is used to switch the extension and retraction action of the clamping cylinder.

[0009] Furthermore, pressure gauges are provided on the gas lines of both the first and second pressure reducing valves to display the pressure value of the high-pressure or low-pressure gas entering the test gas line in real time.

[0010] Furthermore, the second branch gas path also includes a pneumatic control valve, a check valve, a flow meter, and a two-position five-way manual control valve. The pneumatic control valve is located at the junction of the first pressure reducing valve and the second pressure reducing valve and is used to control the on / off state of the gas path. The two-position five-way manual control valve is connected to the pneumatic control valve, the flow meter is connected to the pneumatic control valve and the two-position five-way manual control valve, and the check valve is connected to the pneumatic control valve and the two-position five-way manual control valve and is used to switch the connection state of the flow meter and the second test gas path.

[0011] Furthermore, the second branch gas path also includes a shut-off valve, which is disposed between the test plate assembly and the flow meter and the one-way valve, and is used to control the opening and closing of the test gas path.

[0012] Furthermore, the second branch air path also includes a double-acting cylinder, which is connected to the solenoid valve under test. The extension and retraction of the double-acting cylinder are used to determine whether the solenoid valve under test is switching normally.

[0013] Furthermore, the test board assembly includes a body and a plate horizontally disposed within the body. The plate is provided with a spring retainer and a contact spring. A lead wire is provided below the plate. The vertical part is provided with an electrical connection port of the solenoid valve under test. The lead wire is connected to the electrical connection port of the solenoid valve under test.

[0014] Furthermore, a limiting post is provided on the top of the body, which is used for the installation and positioning of the solenoid valve under test.

[0015] Furthermore, a waterproof ring is provided between the test board assembly and the base, and waterproof PVC sealing plates are provided at both ends of the board body to seal the internal structure of the test board assembly and prevent liquid intrusion.

[0016] The beneficial effects of this utility model are as follows: By setting a three-position four-way manual valve and a first pressure reducing valve and a second pressure reducing valve, this utility model can quickly switch the high pressure or low pressure state of the second branch gas circuit, avoiding the cumbersome operation of gradually adjusting the gas pressure through the traditional pressure reducing valve, improving the testing efficiency, meeting the airtightness testing requirements of the pilot-operated solenoid valve under different working conditions, and ensuring the comprehensiveness and reliability of the test. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a pneumatic schematic diagram of a pilot-operated solenoid valve airtightness testing device.

[0019] Figure 2 This is a schematic diagram of the device for testing the airtightness of a pilot-operated solenoid valve.

[0020] Figure 3 This is a schematic diagram of the device for testing the airtightness of a pilot-operated solenoid valve from another angle (with part of the cover plate on the base removed).

[0021] Figure 4 This is a schematic diagram of the test board assembly.

[0022] Reference numerals: 1. Base; 101. Horizontal part; 102. Vertical part; 102a. Electrical connection port of the solenoid valve under test; 2. Test plate assembly; 201. Body; 202. Plate; 203. Spring retainer; 204. Contact spring; 205. Lead wire; 206. Waterproof ring; 207. Waterproof PVC sealing plate; 208. Limiting post; 3. Clamping cylinder; 4. Three-position four-way manual valve; 5. First pressure reducing valve; 6. Second pressure reducing valve; 7. Third pressure reducing valve; 8. Two-position five-way dual-electro-controlled solenoid valve; 9. Pressure gauge; 10. Pneumatic valve; 11. Flow meter; 12. Two-position five-way manual valve; 13. Shut-off valve; 14. Double-acting cylinder; 15. Check valve; 17. Cylinder clamping switch; 18. Cylinder release switch;

[0023] 01. First branch gas path; 02. Second branch gas path;

[0024] 001. The solenoid valve under test. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figures 1 to 4 As shown: A device for testing the air tightness of a pilot-operated solenoid valve includes: a test air circuit, a control panel system, and a base 1. The test air circuit is connected to the base 1. The control panel system is mounted on the base 1. The base 1 includes a horizontal part 101 and a vertical part 102 that are perpendicular to each other. The horizontal part 101 is provided with a test plate assembly 2. The vertical part 102 is provided with a clamping cylinder 3, a three-position four-way manual valve 4, a first pressure reducing valve 5, and a second pressure reducing valve 6. The first pressure reducing valve 5 is used to adjust the high pressure value, and the second pressure reducing valve 6 is used to adjust the low pressure value.

[0029] The test air path is connected to the base 1 and is divided into two branch air paths. The first branch air path 01 is connected to the clamping cylinder 3 and is used to drive the extension and retraction of the clamping cylinder 3 to press or release the solenoid valve 001 under test. The second branch air path 02 is connected to the air path inlet of the solenoid valve 001 under test through the first pressure reducing valve 5, the three-position four-way manual valve 4 and the second pressure reducing valve 6 for air tightness testing. The three-position four-way manual valve 4 is used to switch the high pressure value or low pressure value state of the second branch air path 02 to realize high and low pressure air tightness testing.

[0030] By setting up a three-position four-way manual valve 4 and a first pressure reducing valve 5 and a second pressure reducing valve 6, the high-pressure or low-pressure state of the second branch air circuit 02 can be quickly switched, avoiding the cumbersome operation of gradually adjusting the air pressure through the traditional pressure reducing valve, thus improving testing efficiency. Especially in test scenarios that require multiple high-low pressure switching, the second branch air circuit 02 is connected to the first pressure reducing valve 5 and the second pressure reducing valve 6 through the three-position four-way manual valve 4, which can adjust the air pressure to high-pressure or low-pressure state respectively, meeting the air tightness test requirements of the pilot-operated solenoid valve under different working conditions, and ensuring the comprehensiveness and reliability of the test.

[0031] The first branch air circuit 01 drives the clamping cylinder 3 to press or release the test piece, which effectively improves the fixing stability of the solenoid valve 001 under test, ensures the accuracy and safety during the test process, and avoids air circuit leakage or test failure caused by loose test piece.

[0032] In this embodiment, the dried and filtered compressed air enters the base 1 at 1 MPa and is divided into two paths by a two-dimensional three-way valve. One path has a low pressure value set to 0.15 MPa and the other path has a high pressure value set to 0.8 MPa. Other high and low pressure values ​​can be set according to the requirements of the solenoid valve 001 being tested, all of which are within the protection scope of this application.

[0033] As a preferred embodiment of the above embodiment, the first branch air circuit 01 further includes a two-position five-way dual-electro-controlled solenoid valve 8 and a third pressure reducing valve 7 located before the clamping cylinder 3. The third pressure reducing valve 7 is used to regulate the air pressure entering the clamping cylinder 3 to control the output force of the clamping cylinder 3. The two-position five-way dual-electro-controlled solenoid valve 8 is used to switch the extension and retraction action of the clamping cylinder 3 to adapt to different models and specifications of the tested solenoid valve 001, avoiding damage to the test piece due to excessive clamping force or loosening of the test piece due to insufficient clamping force, which would affect the test accuracy. Precise air pressure regulation and action switching can effectively avoid overload problems caused by improper output force of the clamping cylinder 3, reduce the wear and tear on the test piece and the test device, and thus extend the service life of the equipment.

[0034] The first pressure reducing valve 5 and the second pressure reducing valve 6 are equipped with pressure gauges 9 in their gas lines. These gauges are used to display the pressure values ​​of the high-pressure or low-pressure gas entering the test gas line in real time. Specifically, pressure gauges 9 can accurately display the output pressure of the high-pressure and second pressure reducing valves, ensuring that the pressure value required in the airtightness test is accurate and controllable. Precise pressure adjustment can avoid the test results being affected by pressure errors, thereby improving the reliability and consistency of the test.

[0035] In this embodiment, the second branch gas path 02 also includes a pneumatic control valve 10, a one-way valve 15, a flow meter 11, and a two-position five-way manual control valve 12. The pneumatic control valve 10 is located at the intersection of the first pressure reducing valve 5 and the second pressure reducing valve 6 and is used to control the opening and closing of the gas path. The two-position five-way manual control valve 12 is connected to the pneumatic control valve 10. The flow meter 11 is connected to the one-way valve 15 and the two-position five-way manual control valve 12. The one-way valve 15 is connected to the pneumatic control valve 10 and the two-position five-way manual control valve 12 and is used to switch the connection state of the flow meter 11 and the second test gas path. Specifically, the connection between the flow meter 11 and the test gas path can be precisely switched through the two-position five-way manual control valve 12. The flow meter is connected for measurement when needed and disconnected when not needed, avoiding the continuous operation of the flow meter in unnecessary stages. This not only improves the accuracy of the test operation but also ensures the accuracy and service life of the flow meter.

[0036] In this embodiment, test preparation is required before testing. This includes checking the accuracy of each gas path connection and ensuring that each valve is in the required initial state. The flow meter is calibrated to ensure its measurement accuracy. The power cord is plugged into the three-phase socket on the workbench, and the power panel switch is turned on. A blind flange is used instead of the valve under test to ensure that there is no leakage in the test gas path. During this process, the flow meter 11 is disconnected from the test gas path when the two-position five-way manual control valve 12 is not pressed. This prevents the flow meter 11 from being affected by impurities, thereby improving the accuracy of the flow meter 11, increasing the reliability of the test results, extending the service life of the flow meter 11, and reducing costs and maintenance frequency.

[0037] The specific operation is as follows: During the test, press the two-position five-way manual control valve 12 to connect the flow meter 11 to the test gas circuit. After reading the value, pull the two-position five-way manual control valve 12 upward to disconnect the flow meter 11 from the test gas circuit.

[0038] The second branch gas path 02 also includes a shut-off valve 13, which is located between the test plate assembly 2 and the flow meter 11 and the one-way valve 15. It is used to control the opening and closing of the test gas path. Specifically, if the flow meter 11 reading is less than the required value, the solenoid valve test is qualified; if the flow meter 11 reading is greater than the required value, the shut-off valve 13 is closed, so that no air enters the valve body, and only the pilot valve assembly is allowed to pass through, in order to determine whether there is a leak in the pilot valve assembly of the solenoid valve. This isolates a part of the test gas path, thereby accurately determining whether the leak comes from the pilot valve assembly of the solenoid valve.

[0039] As a preferred embodiment of the above embodiment, the second branch air circuit 02 further includes a double-acting cylinder 14, which is connected to the solenoid valve 001 under test. The extension and retraction of the double-acting cylinder 14 is used to determine whether the solenoid valve 001 under test is switching normally. Specifically, the extension and retraction of the double-acting cylinder 14 can quickly determine whether the solenoid valve 001 under test can switch normally without the need for inference through indirect testing methods. The testing process is more intuitive and the results are more clear.

[0040] In this embodiment, the control panel system includes at least a cylinder clamping switch 17 and a cylinder releasing switch 18, and both are sealed with a sealing ring to the base 1. Specifically, during product testing, after the conclusion that the product has external leakage, in order to determine the location of the external leakage, a leak test liquid can be applied to the location where the solenoid valve may leak. In order to prevent liquid from entering the electrical components at the bottom of the tooling, the switches must use a waterproof structure to prevent liquid from seeping into the device when using the leak test liquid, thus avoiding the failure of electrical components due to short circuit or corrosion, thereby improving the durability and reliability of the electrical components.

[0041] The test board assembly 2 includes a main body 201 and a plate 202 horizontally disposed within the main body 201. The plate 202 is provided with a spring retainer 203 and a contact spring 204. A lead wire 205 is provided below the plate 202. The vertical part 102 is provided with an electrical connection port 102a of the solenoid valve under test. The lead wire 205 is connected to the electrical connection port 102a of the solenoid valve under test. On the one hand, the spring retainer 203 provides support, and the contact spring 204 can continuously apply appropriate pressure to ensure that the solenoid valve under test 001 maintains reliable electrical contact with the electrical connection port 102a of the solenoid valve under test during the test, avoiding poor contact caused by vibration or positional displacement. On the other hand, the electrical connection port 102a of the solenoid valve under test is located in the vertical part 102, which has higher protection performance and can effectively isolate liquids, dust or other contaminants, protect the electrical connection from environmental influences, and improve the overall safety and reliability of the test device.

[0042] In this embodiment, a limiting post 208 is provided on the top of the main body 201. The limiting post 208 is used for the installation and positioning of the solenoid valve 001 under test. Specifically, in this embodiment, there are two limiting posts 208, but other numbers are also possible, depending on the structure of the solenoid valve 001 under test. The design of the limiting post 208 effectively prevents the solenoid valve 001 under test from deviating in position during installation, ensuring accurate docking of the test air circuit, lead wire 205 and other connecting parts, thus improving the accuracy and reliability of the airtightness test. The operator only needs to align the solenoid valve with the limiting post 208 for installation, without having to repeatedly adjust the position, which greatly shortens the installation time, reduces the requirements for operating skills, and improves the overall testing efficiency.

[0043] As a preferred embodiment of the above, a waterproof ring 206 is provided between the test plate assembly 2 and the base 1, and waterproof PVC sealing plates 207 are provided at both ends of the plate body 202 to seal the internal structure of the test plate assembly 2, prevent liquid intrusion, and enhance the performance of the test device in a humid environment.

[0044] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for testing the airtightness of a pilot-operated solenoid valve, characterized in that, include: The test air circuit, control panel system, and base are provided. The test air circuit is connected to the base. The control panel system is mounted on the base. The base includes a horizontal part and a vertical part that are perpendicular to each other. The horizontal part is provided with a test plate assembly. The vertical part is provided with a clamping cylinder, a three-position four-way manual valve, a first pressure reducing valve, and a second pressure reducing valve. The first pressure reducing valve is used to adjust the high pressure value, and the second pressure reducing valve is used to adjust the low pressure value. The test air path is connected to the base and divided into two branch air paths. The first branch air path is connected to the clamping cylinder and is used to drive the extension and retraction of the clamping cylinder to press or release the solenoid valve under test. The second branch air path is connected to the air path inlet of the solenoid valve under test through the first pressure reducing valve, the three-position four-way manual valve and the second pressure reducing valve, and is used for air tightness testing. The three-position four-way manual valve is used to switch the high pressure value or low pressure value state of the second branch air path to realize high and low pressure air tightness testing.

2. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 1, characterized in that, The first branch air circuit also includes a two-position five-way dual-electro-controlled solenoid valve and a third pressure reducing valve located before the clamping cylinder. The third pressure reducing valve is used to adjust the air pressure entering the clamping cylinder to control the output force of the clamping cylinder. The two-position five-way dual-electro-controlled solenoid valve is used to switch the extension and retraction action of the clamping cylinder.

3. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 1, characterized in that, Both the first and second pressure reducing valves are equipped with pressure gauges on their gas lines to display the pressure value of the high-pressure or low-pressure gas entering the test gas line in real time.

4. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 1, characterized in that, The second branch gas path also includes a pneumatic control valve, a check valve, a flow meter, and a two-position five-way manual control valve. The pneumatic control valve is located at the junction of the first pressure reducing valve and the second pressure reducing valve and is used to control the opening and closing of the gas path. The two-position five-way manual control valve is connected to the pneumatic control valve, the flow meter is connected to the pneumatic control valve and the two-position five-way manual control valve, and the check valve is connected to the pneumatic control valve and the two-position five-way manual control valve and is used to switch the connection status of the flow meter and the second test gas path.

5. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 4, characterized in that, The second branch gas path also includes a shut-off valve, which is disposed between the test plate assembly and the flow meter and the one-way valve, and is used to control the opening and closing of the test gas path.

6. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 1, characterized in that, The second branch air path also includes a double-acting cylinder, which is connected to the solenoid valve under test. The extension and retraction of the double-acting cylinder are used to determine whether the solenoid valve under test is switching normally.

7. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 1, characterized in that, The test board assembly includes a main body and a plate horizontally disposed within the main body. The plate is provided with a spring retainer and a contact spring. A lead wire is provided below the plate. The vertical part is provided with an electrical connection port of the solenoid valve under test. The lead wire is connected to the electrical connection port of the solenoid valve under test.

8. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 7, characterized in that, The top of the main body is provided with a limiting post, which is used for the installation and positioning of the solenoid valve under test.

9. The apparatus for testing the airtightness of a pilot-operated solenoid valve according to claim 7, characterized in that, A waterproof ring is provided between the test board assembly and the base, and waterproof PVC sealing plates are provided at both ends of the board body to seal the internal structure of the test board assembly and prevent liquid intrusion.

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