Cloth clamping diaphragm pressure maintaining and blasting testing tool

Abstract

The utility model discloses a pressure maintaining and blasting test tool for a cloth-sandwiched diaphragm, which integrates dual functions of pressure maintaining test and blasting test, not only can effectively discriminate early leakage or abnormal bumps caused by hidden defects such as uneven distribution of internal fibers, but also can accurately measure the ultimate blasting strength of the cloth-sandwiched diaphragm, and realizes comprehensive evaluation of product performance. By adopting a sealing mode of combining vacuum adsorption and a high-finish sealing ring, a soft and weak cloth clamping membrane can be uniformly, flatly and tightly attached without damage at the beginning of a test, stable and reliable initial sealing is formed, the problem of extrusion damage or untight sealing possibly caused by a traditional mechanical clamp is fundamentally solved, and the test efficiency is improved. A solid foundation is laid for the authenticity of a test result, and the accuracy of test pressure data and the reliability of pressure maintaining process evaluation are jointly guaranteed through the application of an inflation system integrated with a one-way valve and a high-precision monitoring instrument.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pressure test technical field relates to a kind of cloth diaphragm test tool, specifically a kind of cloth diaphragm pressure maintenance and blasting test tool. BACKGROUND

[0002] Cloth diaphragm is widely used in valve, pump, actuator and various fluid control equipment as a kind of key flexible sealing and pressure driving element. It is usually composed of multiple layers of fiber reinforced material (cloth) and elastomer, with good flexibility, fatigue resistance and other advantages.

[0003] However, such diaphragm has inherent technical difficulties in production process: (1) due to the limitation of forming process, the thickness of each area of diaphragm may have slight difference, especially in the process of fiber cloth layering and rubber vulcanization, thickness deviation is easy to occur; (2) internal reinforced fiber cloth may have problems such as uneven warp and weft tension, local wrinkles or sparse fiber distribution during forming, resulting in anisotropy and local weak points of the overall mechanical properties of diaphragm.

[0004] These inherent manufacturing defects are difficult to be found in routine inspection before product delivery, but they will be exposed in actual use conditions under alternating pressure or continuous pressure maintenance, which is specifically manifested as: (1) micro leakage occurs in local weak area, resulting in failure to maintain system pressure and device function; (2) local area of diaphragm has unintended plastic deformation or bulging due to insufficient strength under lower than design pressure, affecting device accuracy and shortening service life; (3) diaphragm tears or bursts before reaching rated burst pressure, with serious safety hazard.

[0005] At present, there is lack of special test tool for cloth diaphragm with such special structure in the industry. Conventional pressure test method mostly uses direct inflation or liquid filling to one side of diaphragm, but this method has the following disadvantages: (1) traditional clamp sealing method is easy to damage the edge of diaphragm due to uneven clamping force, or cannot effectively seal thin and soft diaphragm, resulting in leakage point introduced in test itself and affecting result accuracy; (2) test can only get "pass" or "fail" conclusion, and cannot accurately evaluate the stability of diaphragm under pressure maintenance, nor can it locate the hidden defects such as uneven local pulling of internal fiber cloth. INVENTION CONTENTS

[0006] To solve the technical problems in the background art, the utility model provides a kind of cloth diaphragm pressure maintenance and blasting test tool to realize accurate and non-destructive test on sealing performance, pressure maintenance stability and final burst strength of cloth diaphragm.

[0007] The purpose of the utility model can be realized by the following technical solutions:

[0008] A cloth diaphragm pressure maintaining and bursting test tool, comprising: a vacuum cavity, a polished sealing ring, the polished sealing ring is arranged in the vacuum cavity to support the cloth diaphragm to be tested, the cloth diaphragm to be tested is placed on the polished surface of the polished sealing ring to divide the vacuum cavity into an upper chamber and a lower chamber, the lower chamber is connected to an external vacuum device through a vacuum interface to vacuumize the lower chamber, so that the cloth diaphragm is adsorbed on the polished sealing ring to form a seal, and the upper chamber is connected to an external gas source through a gas inlet to fill gas into the upper chamber to maintain pressure and burst test the cloth diaphragm.

[0009] Further, a one-way valve is installed in the gas inlet.

[0010] Further, a precision pressure gauge is installed in the upper chamber to monitor the test pressure in the upper chamber in real time, and a vacuum gauge is installed in the lower chamber to monitor the vacuum degree in the lower chamber in real time.

[0011] Further, the test tool further comprises a data logger, which is in communication connection with the precision pressure gauge and the vacuum gauge respectively, to continuously record the pressure-time curve in the upper chamber and the vacuum degree-time curve in the lower chamber during the pressure maintaining and bursting test.

[0012] Further, the test tool further comprises a controller in communication connection with the data logger, and the controller is configured to determine that the test is wrong when the pressure value in the upper chamber is always lower than the preset threshold value during the pressure maintaining test, stop the test and issue an alarm.

[0013] Further, the vacuum cavity comprises a base and a top cover, the base and the top cover are arranged in opposition and are fixed by fastening bolts.

[0014] Further, an annular groove is provided on the base, and the polished sealing ring is detachably installed in the annular groove through threaded connection or interference fit.

[0015] Further, a pressure relief port is provided on the top wall or the side wall of the top cover, and a safety bursting disc is installed in the pressure relief port.

[0016] Further, an auxiliary sealing ring is arranged between the abutting surfaces of the base and the top cover.

[0017] Further, the test tool further comprises a safety shield made of transparent explosion-proof material, and the safety shield is arranged outside the vacuum cavity.

[0018] The utility model discloses a beneficial effect: the utility model discloses a cloth film piece pressure maintaining and blasting test frock provided by this utility model, through adopting the sealing mode of vacuum adsorption and high finish sealing ring combination, can make the soft weak cloth film piece even, flat and no damage tightly close at the beginning of testing, form stable and reliable initial sealing, fundamentally overcome the extrusion damage or sealing problem of not being strict that traditional mechanical clamp can cause, lay a solid foundation for the authenticity of test result, through the application of integrated one-way valve inflation system and high-precision monitoring instrument, the accuracy of test pressure data and the reliability of pressure maintaining process evaluation are jointly ensured, through the integration of pressure maintaining test and blasting test double function, not only can effectively identify the early leakage or abnormal bulge caused by internal fiber uneven distribution hidden defects, but also can accurately determine its limit blasting strength, realize the comprehensive evaluation to product performance, in addition, the modular cavity design is convenient to mount and maintain, and the external transparent safety shield and the built-in pressure relief device constitute multilevel safety protection, ensure the safety and visibility of testing process, through the introduction of automatic data recording and intelligent judgment mechanism, further improve the test efficiency and objectivity, in conclusion, the frock effectively solves the industry problem of the lack of cloth film piece targeted test means, through its accurate, safe and efficient test capacity, provides key guarantee for significantly improving product factory quality and use reliability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the structural schematic diagram of the utility model.

[0020] Fig. 2 It is the structural schematic diagram of the utility model upper cover.

[0021] Fig. 3 It is the structural schematic diagram of the utility model base. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments only are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

[0023] As Figs. 1-3The utility model provides a kind of cloth sandwiching membrane piece pressure maintaining and blasting test tool, comprising: vacuum cavity 1, polishing seal ring 2, polishing seal ring 2 is set in vacuum cavity 1, to support the cloth sandwiching membrane piece 3 to be tested, wherein, the material of polishing seal ring 2 is austenitic stainless steel, quenched steel or hard ceramic. The cloth sandwiching membrane piece 3 to be tested is placed on the polishing surface of polishing seal ring 2, to separate vacuum cavity 1 into upper chamber 4 and lower chamber 5, wherein, the polishing surface is the plane that is polished, and the surface roughness Ra is no more than 0.8 μm.

[0024] Lower chamber 5 is connected to external vacuum equipment through vacuum interface 6, to vacuumize in lower chamber 5, and the cloth sandwiching membrane piece 3 is adsorbed on polishing seal ring 2 to form seal using vacuum adsorption principle, so that soft cloth sandwiching membrane piece 3 can be evenly and smoothly attached on highly smooth polishing seal ring 2 at the beginning of test, to form a lossless, reliable and stable initial seal, to fundamentally overcome the drawbacks that traditional mechanical clamp can press the membrane piece or seal is not tight, to lay a solid foundation for subsequent high-precision pressure maintaining and blasting test.

[0025] Upper chamber 4 is connected to external gas source through inflation port 7, to fill gas into upper chamber 4, to pressure maintain and blast test cloth sandwiching membrane piece 3. One-way valve 8 is installed in inflation port 7, to ensure that test gas can only enter upper chamber 4 in one direction, to effectively prevent gas from flowing back to gas source pipeline during pressure maintaining test phase, to ensure that upper chamber 4 becomes a closed system after stopping inflation, so that any change in upper chamber 4 can truly reflect the sealing performance or small leakage of cloth sandwiching membrane piece 3, to greatly improve the accuracy and reliability of pressure maintaining test data.

[0026] Precise pressure gauge is installed in upper chamber 4, to monitor test pressure in upper chamber 4 in real time, and the accuracy of precise pressure gauge is no less than 0.0001 bar, to acutely capture the small attenuation of pressure in upper chamber 4, to accurately evaluate the pressure maintaining performance of cloth sandwiching membrane piece 3, to provide comprehensive data support for test process. Vacuum gauge is installed in lower chamber 5, to monitor vacuum degree in lower chamber 5 in real time, to reflect the effectiveness of vacuum seal in lower chamber 5, to ensure the stability of adsorption seal during test process, to avoid test misjudgment caused by membrane piece loosening due to the decrease of vacuum degree in lower chamber 5. During blasting test phase, the blasting instant of cloth sandwiching membrane piece 3 can be accurately determined by combining the pressure change in upper chamber 4 and the vacuum degree change in lower chamber 5.

[0027] The test tool further comprises a data logger and a controller, the data logger is respectively in communication connection with the precision pressure gauge and the vacuum gauge, so as to continuously record the pressure-time curve in the upper chamber 4 and the vacuum-time curve in the lower chamber 5 during the pressure maintaining and burst testing, thereby realizing the digitization and traceability of the testing process, and the automatically recorded pressure-time curve and vacuum-time curve provide objective and accurate data basis for subsequent analysis of the creep characteristics, trace leakage rate and burst pressure peak of the cloth clamping diaphragm 3, get rid of the error of relying on manual interpretation, and make the test results more scientific and convincing.

[0028] The controller is in communication connection with the data logger, the controller is configured to determine that the test is wrong when the pressure value in the upper chamber 4 is always lower than the preset threshold value during the pressure maintaining test, stop the test and issue an alarm, so as to automatically identify that the pressure cannot be established due to abnormal conditions such as leakage of the tool itself, and timely interrupt the test and issue an alarm, prevent the invalid test from continuing, save time, and guide the operator to timely troubleshoot, improve the automation level and safety of the test.

[0029] The vacuum cavity 1 comprises a base 11 and a top cover 12, the base 11 and the top cover 12 are oppositely arranged and connected and fixed by fastening bolts 10, the split structure makes the assembly, disassembly and cloth clamping diaphragm 3 taking and placing operation of the tool extremely simple, facilitates daily maintenance and cleaning, and also reduces manufacturing and maintenance costs. The vacuum interface 6 is opened on the bottom wall of the base 11, and the inflation port 7 is opened on the top wall or side wall of the top cover 12. An auxiliary sealing ring is arranged between the abutting surfaces of the base 11 and the top cover 12, which ensures the static sealing reliability of the abutting surfaces of the base 11 and the top cover 12 when the vacuum cavity 1 is closed, effectively isolates the infiltration of external air, ensures the stability of the vacuum environment of the lower chamber 5, and indirectly ensures the adsorption and sealing effect of the cloth clamping diaphragm 3.

[0030] The base 11 is provided with an annular groove 13, and the polishing sealing ring 2 is detachably installed in the annular groove 13 through threaded connection or interference fit, which greatly improves the practicability and maintainability of the tool. When the polishing sealing ring 2 is worn or damaged due to long-term use, it can be conveniently replaced without the need to replace the entire base 11, thereby reducing maintenance costs and prolonging the service life of the tool. A pressure relief port 14 is opened on the top wall or side wall of the top cover 12, and a safety burst disc 15 is installed in the pressure relief port 14, forming a passive safety barrier. In the event of controller failure or accidental overpressure, the safety burst disc 15 can break first to relieve pressure, effectively preventing the risk of explosion of the upper chamber 4 due to overpressure, and ensuring the safety of personnel and equipment.

[0031] The test tool further comprises a safety shield 9 made of transparent explosion-proof material, which is arranged outside the vacuum cavity 1 to form a positive safety protection structure of the tool, physically isolates potential explosion risks from the operator, and allows the test state of the cloth diaphragm 3 to be observed throughout without affecting safety due to the transparent property, thereby realizing the unity of safety and visualization.

[0032] The above is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, which shall belong to the protection scope of the utility model.

Claims

1. A clamp cloth diaphragm pressure maintaining and burst testing tool, characterized in that, The utility model relates to a kind of test device for cloth membrane, including: vacuum cavity (1), polishing seal ring (2), polishing seal ring (2) is set in vacuum cavity (1), to support the cloth membrane (3) to be tested, the cloth membrane (3) to be tested is placed on the polishing surface of polishing seal ring (2), to divide into upper chamber (4) and lower chamber (5) with vacuum cavity (1), lower chamber (5) is connected external vacuum equipment by vacuum interface (6), to be evacuated in lower chamber (5), make cloth membrane (3) adsorb on polishing seal ring (2) and form seal, upper chamber (4) is connected external gas source by inflation port (7), to fill gas into upper chamber (4), to the cloth membrane (3) is carried out pressure maintaining, burst test. One-way valve (8) is installed in inflation port (7).

2. The test fixture of claim 1, wherein, Precise pressure gauge is installed in upper chamber (4), to monitor the test pressure in upper chamber (4) in real time, vacuum gauge is installed in lower chamber (5), to monitor the vacuum degree in lower chamber (5) in real time.

3. The test fixture of claim 1, wherein, Further comprising:

4. The test fixture of claim 3, wherein, Data logger, data logger is connected with precise pressure gauge, vacuum gauge communication respectively, to continuously record the pressure-time curve in upper chamber (4) and the vacuum degree-time curve in lower chamber (5) in pressure maintaining and burst test process. Further comprising:

5. The test fixture of claim 4, wherein, Controller is connected with data logger communication, controller is configured as when the pressure value in upper chamber (4) is always lower than preset threshold value in pressure maintaining test stage, determine as test error, stop test and issue alarm. Vacuum cavity (1) includes: base (11), top cover (12), base (11) is set with top cover (12) and is connected fixed by fastening bolt (10).

6. The test fixture of claim 1, wherein, Annular groove (13) is equipped on base (11), polishing seal ring (2) is detachably installed in annular groove (13) by screw connection or interference fit.

7. The test fixture of claim 6, wherein, Pressure relief port (14) is set on the top wall or side wall of top cover (12), safety burst disc (15) is installed in pressure relief port (14).

8. The test fixture of claim 6, wherein, Auxiliary sealing ring is arranged between the joint surface of base (11) and top cover (12).

9. The test fixture of claim 6, wherein, Further comprising:

10. The test fixture of claim 1, wherein, Safety shield (9) is made of transparent explosion-proof material, safety shield (9) is covered in the outside of vacuum cavity (1). ​

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