A device and method for detecting working state of a pinch valve

Abstract

The present invention discloses a working state detection device and detection method of a pinch valve: comprising a sensor housing, a solenoid valve and a hose sleeve detection device for detecting the position of a hose sleeve in a valve, the pinch valve is provided with a compressed air interface, the sensor housing is connected to the compressed air interface, and a pressure sensor diaphragm for detecting and controlling air pressure is also provided in the sensor housing; the hose sleeve detection device is a capacitance probe rod or a spring probe rod, and the capacitance probe rod or the spring probe rod is inserted into the pinch valve body through the compressed air interface. The present invention collects the air source state and the radial position signal of the hose sleeve in the valve, and fully considers the possible faults of the pinch valve during operation, and then obtains the corresponding relationship between the air source state, the radial position signal of the hose sleeve in the valve and the working state of the pinch valve, thereby realizing all-round monitoring of the working state of the pinch valve.

Description

Technical Field

[0001] The invention relates to the technical field of pinch valves, and in particular to a pinch valve working state detection device and a pinch valve working state detection method. Background Art

[0002] The pinch valve is mainly composed of two parts: the valve body shell and the hose sleeve. When the control medium is not input, the cavity between the hose sleeve and the valve body is connected to the atmosphere, and the hose sleeve is in an outward expansion state due to the fluid pressure and its own material elasticity, and the material conveying channel in the hose sleeve is opened. When the control medium enters the cavity between the hose sleeve and the valve body, the hose sleeve is deformed under the pressure of the control medium, the material conveying channel in the hose sleeve is closed, and the material is intercepted. When the pressure is released after the control medium is discharged again, the material conveying channel in the hose sleeve is opened again. In this way, the valve channel is opened and closed by using a pressurized control medium. The control medium can be compressed air, hydraulic oil, water pressure, etc.

[0003] The pinch valve series products have no moving sealing surface and will not leak. They are resistant to particle corrosion and will not get clogged when conveying liquid and powder materials containing fibers. Among them, the pneumatic pinch valve is suitable for various pneumatic conveying systems, and its application areas include cement silos, pigment and particle processing, ceramic, glass and plastic industries, sewage treatment, pharmaceutical industry, food industry and wine brewing industry. It is also widely used in batching systems and weighing systems, powder spraying systems, vacuum toilet systems, vacuum conveying systems, suction and compressed air control systems.

[0004] Unlike other types of valves, the closed state of the hose sleeve of the pinch valve cannot be directly observed from the valve body shell. For example, if the control medium pressure decreases, the control medium cannot completely close the material channel, causing the pinch valve to leak. Furthermore, even if the control medium pressure supply is normal, the material pressure in the material channel fluctuates greatly. When the material pressure is close to the control medium pressure, the hose sleeve opens due to the expansion elasticity of the hose sleeve itself, causing the pinch valve to leak. On the other hand, the hose sleeve of the pinch valve is damaged after long-term use, causing the control medium to flow into the material channel, or the material to reversely enter the control medium system. In view of the above reasons, there is a common problem in the prior art that the working and fault states of the pinch valve cannot be monitored, and the main reason is that the above-mentioned factors are not fully considered. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a pinch valve working state detection device and detection method, which solves the problem in the prior art that the pinch valve working and fault states cannot be monitored.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A device for detecting the working state of a pinch valve, characterized in that it comprises a sensor housing, a solenoid valve and a hose sleeve detection device for detecting the position of a hose sleeve in the valve, the pinch valve is provided with a compressed air interface, the sensor housing is connected to the compressed air interface, and a pressure sensor diaphragm for detecting and controlling air pressure is also provided in the sensor housing;

[0008] The working port of the solenoid valve is connected to the control air source and the sensor housing.

[0009] Preferably, in the aforementioned device for detecting the working state of a pinch valve: the sensor housing is connected to the compressed air interface via threads.

[0010] Preferably, in the aforementioned device for detecting the working state of a pinch valve: the hose sleeve detection device is a capacitance probe rod or a spring probe rod, and the capacitance probe rod or the spring probe rod is inserted into the pinch valve body through a compressed air interface.

[0011] Preferably, in the aforementioned device for detecting the working state of a pinch valve: a control circuit board is further provided in the sensor housing, and the control circuit board is provided with indicator lights for displaying different working states.

[0012] Preferably, in the aforementioned device for detecting the working status of a pinch valve, an indicator light is arranged inside a sensor housing, and the sensor housing is provided with a transparent outer cover for observing the indicator light.

[0013] A method for detecting the working state of a pinch valve:

[0014] Real-time detection of the solenoid valve power supply voltage, pressure sensor signal and radial position signal of the hose sleeve inside the valve;

[0015] When it is detected that both the solenoid valve power supply voltage signal and the pressure sensor signal exist, and the radial position of the hose sleeve in the valve is in the preset closed position, the pinch valve is determined to be in the valve closed state;

[0016] When it is detected that the solenoid valve power supply voltage signal exists, the pressure sensor signal does not exist, and the radial position of the hose sleeve in the valve is in the preset open state, it is determined to be one or both of the control air source failure and the hose sleeve damage failure in the valve;

[0017] When the solenoid valve power supply voltage and pressure sensor signal are detected at the same time, but the radial position of the hose sleeve in the valve is in the preset open state, it is determined to be one or more of the following: air source failure, hose sleeve damage failure, and hose sleeve incomplete closure failure;

[0018] When the solenoid valve power supply voltage and the pressure sensor signal do not exist, and the radial position of the hose sleeve in the valve is in a preset open state, the valve is determined to be in a normal open state.

[0019] Preferably, in the aforementioned method for detecting the working status of a pinch valve: the radial position of the hose sleeve in the valve is detected by a capacitive probe rod or a spring probe rod.

[0020] Preferably, the aforementioned method for detecting the working status of a clamp valve is as follows: when a capacitive probe is used for monitoring, when both the solenoid valve power supply voltage and the pressure sensor signal do not exist, and the radial position of the hose sleeve in the valve is in a preset closed state, it is determined that one or both of the hose sleeve in the valve is damaged and material has entered the valve cavity.

[0021] Preferably, the aforementioned method for detecting the working status of a pinch valve further displays the current status of the valve by indicator lights of different colors, and the current status of the valve at least includes valve closed, valve fault, and valve normally open.

[0022] The beneficial effects achieved by the present invention are:

[0023] Compared with the prior art, the present invention can monitor the working state and fault state of the pinch valve in real time and feed back to the user. The present invention collects the gas source state (including the solenoid valve power supply voltage, the pressure sensor signal) and the radial position signal of the hose sleeve in the valve, and fully considers the possible faults of the pinch valve during operation, and then obtains the corresponding relationship between the gas source state, the radial position signal of the hose sleeve in the valve and the working state of the pinch valve, thereby realizing all-round monitoring of the working state of the pinch valve.

[0024] With respect to the position of the hose sleeve in the valve, the present invention provides two monitoring methods, namely, a capacitance probe and a spring probe, which can be selected according to actual needs in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The pinch valve of the present invention is in a closed state. Figure 1 (capacitance probe);

[0026] Figure 2 The pinch valve of the present invention is in an open state. Figure 1 (capacitance probe);

[0027] Figure 3 The pinch valve of the present invention is in an open state. Figure 2 (Spring probe);

[0028] Figure 4 The pinch valve of the present invention is in an open state. Figure 2 (Spring probe);

[0029] Meaning of the reference numerals: 1-pinch valve body; 2-hose sleeve inside the valve; 3-capacitance probe rod; 4-compressed air interface; 5-pressure sensor diaphragm; 6-solenoid valve; 7-sensor housing; 8-spring probe rod; 9-control circuit board. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0031] like Figures 1 to 4 As shown: This embodiment discloses a device for detecting the working state of a pinch valve, including a sensor housing 7, a solenoid valve 6 and a hose sleeve detection device for detecting the position of a hose sleeve in the valve, the pinch valve is provided with a compressed air interface 4, the sensor housing 7 is connected to the compressed air interface 4, and a pressure sensor diaphragm 5 for detecting and controlling air pressure is also provided in the sensor housing 7.

[0032] The working port of the solenoid valve 6 is connected to the control gas source and the sensor housing 7 , and the solenoid valve 6 is used to realize the connection or disconnection between the control gas source and the sensor housing 7 .

[0033] The sensor housing 7 is connected to the compressed air interface 4 via threads.

[0034] The hose sleeve detection device is a capacitance probe rod 3 or a spring probe rod 8, and the capacitance probe rod 3 or the spring probe rod 8 is inserted into the valve body 1 of the clamp valve through the compressed air interface 4. When the capacitance probe rod 3 is used, the capacitance probe rod 3 may not be in contact with the hose sleeve 2 in the valve, and monitoring is performed in a contactless manner. The specific monitoring method belongs to the prior art. When the capacitance probe rod 3 is used to monitor the position of the hose sleeve, the capacitance probe rod 3 may not be in contact with the hose sleeve 2 in the valve, and monitoring is performed in a contactless manner. When the spring probe rod 8 is used to monitor the position of the hose sleeve 2 in the valve, the other end of the spring probe rod 8 (inside the sensor housing 7) is also provided with a position sensor for detecting the position of the spring probe rod 8.

[0035] A control circuit board 9 is also provided in the sensor housing 7, and the control circuit board 9 is provided with indicator lights for displaying different working states. For example, it is green when the valve is normally closed, yellow when the valve fails, and red when the valve is red. When the indicator light is provided inside the sensor housing 7, the sensor housing 7 is provided with a transparent cover for observing the indicator light, and the transparent cover needs to be provided on the sensor housing 7 to facilitate observation of the internal indicator light. Embodiment 1:

[0036] This embodiment discloses a method for detecting the working state of a pinch valve. In this embodiment, the position of the rubber hose sleeve 2 in the valve is detected by a capacitive probe 3. The specific control strategy is shown in the following table:

[0037]

[0038] The control system detects the solenoid valve power supply voltage, the pressure sensor signal and the radial position signal of the hose sleeve inside the valve in real time.

[0039] 1. When it is detected that the power supply voltage signal of the solenoid valve 2 and the pressure sensor signal (which can be detected by the pressure sensor diaphragm 5) are both present, and the radial position of the hose sleeve in the valve is in the preset closed position, it is considered that the control gas source is normal, the solenoid valve 6 is in the open state, and the hose sleeve 2 in the valve is in the closed position preset by the system. At this time, the pinch valve is judged to be in the valve closed state.

[0040] 2. When the electromagnetic valve power supply voltage signal is detected, the pressure sensor signal is not detected, and the radial position of the hose sleeve 2 in the valve is in the preset open state, it indicates that the electromagnetic valve 6 is in the open state, but the pressure of the gas source cannot be detected. Then there are two possibilities. One is that the gas source is turned on, but there is a gas leak between the pinch valve body 1 and the hose sleeve 2 in the valve. Considering that the pinch valve body 1 is made of metal and is usually not damaged, it is determined that the hose sleeve 2 in the valve is damaged; the other is that the hose sleeve 2 in the valve is not damaged, but the gas source is faulty. The gas source fault includes pipeline damage, air compressor inoperation or failure, and electromagnetic valve 6 is powered on but does not work. The above two fault conditions may also exist at the same time.

[0041] 3. When the solenoid valve power supply voltage and pressure sensor signal are detected at the same time, but the radial position of the hose sleeve in the valve is in the preset open state, it is determined to be one or more of the following failures: air source failure, hose sleeve damage failure, and hose sleeve incomplete closure failure.

[0042] The specific explanation is: the gas source failure includes pipeline damage, air compressor failure or failure, solenoid valve 6 is powered but does not work; the failure of the hose sleeve damage in the valve usually refers to the damage of the hose sleeve, but the damaged hose sleeve can still trigger the capacitance probe 3. If the hose sleeve is damaged, the working fluid enters the interior of the sensor housing 7, then it is very likely that the pressure sensor signal is still normal. The hose sleeve in the valve is not completely closed, which means that although the gas source and the hose sleeve in the valve are normal, it may be due to the excessive pressure of the working fluid, and the hose sleeve 2 in the valve itself has a certain elastic force, which may push the hose sleeve 2 in the valve open, resulting in a small gap inside the hose sleeve 2 in the valve, and it is not completely closed. At this time, the gas source pressure can be increased.

[0043] 4. When the solenoid valve power supply voltage and pressure sensor signal do not exist, and the radial position of the hose sleeve in the valve is in the preset closed state, it is determined that the hose sleeve in the valve is damaged or the material enters the valve cavity. The specific explanation is: if the solenoid valve power supply voltage does not exist, it means that the solenoid valve is not powered on, and the control air pressure does not enter the pinch valve body 1, then the pressure sensor signal does not exist. At this time, if the radial position of the hose sleeve 2 in the valve can still be monitored to be in the preset closed state, it is considered that the hose sleeve 2 in the valve is damaged, and the damaged hose sleeve triggers the capacitor probe 3. There is also a possibility that the hose sleeve 2 in the valve is damaged, but the working fluid (or internal foreign matter) triggers the capacitor probe 3.

[0044] 5. When the solenoid valve power supply voltage and pressure sensor signal do not exist, and the radial position of the hose sleeve in the valve is in the preset open state, the valve is judged to be in the normal open state.

[0045] In response to the above-mentioned different valve states, this embodiment also displays the current state of the valve through indicator lights of different colors, and the current state of the valve at least includes valve closed, valve fault and valve normally open; in addition, since there are many types of valve faults, different faults can be displayed in more detail, and the user can be informed of the specific fault type by adding a fault code alarm.

[0046] Embodiment 2:

[0047] In this embodiment, the position of the rubber hose sleeve 2 in the valve is detected by the spring probe 8. The specific control strategy is shown in the following table:

[0048]

[0049] Compared with the first embodiment, this embodiment uses a spring probe 8, which has a different working principle from the capacitive probe 3, so the fourth detection result in the first embodiment does not exist, and the remaining detection results and principles are the same as those 1, 2, 3, and 5 in the first embodiment.

[0050] Compared with the prior art, the present invention can monitor the working state and fault state of the pinch valve in real time and feed back to the user. The present invention collects the gas source state (including the solenoid valve power supply voltage, the pressure sensor signal) and the radial position signal of the hose sleeve in the valve, and fully considers the possible faults of the pinch valve during operation, and then obtains the corresponding relationship between the gas source state, the radial position signal of the hose sleeve in the valve and the working state of the pinch valve, thereby realizing all-round monitoring of the working state of the pinch valve.

[0051] With respect to the position of the hose sleeve in the valve, the present invention provides two monitoring methods, namely, a capacitance probe rod 3 and a spring probe rod 8, which can be selected according to actual needs in practical applications.

[0052] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for detecting the working state of a pinch valve, characterized in that: The invention comprises a sensor housing (7), a solenoid valve (6) and a hose sleeve detection device for detecting the position of the hose sleeve in the valve, wherein the pinch valve is provided with a compressed air interface (4), the sensor housing (7) is connected to the compressed air interface (4), and a pressure sensor diaphragm (5) for detecting and controlling air pressure is also provided in the sensor housing (7); The working port of the solenoid valve (6) is connected to the control air source and the sensor housing (7); Real-time detection of the solenoid valve power supply voltage, pressure sensor signal and radial position signal of the hose sleeve inside the valve; When it is detected that both the solenoid valve power supply voltage signal and the pressure sensor signal exist, and the radial position of the hose sleeve in the valve is in the preset closed position, the pinch valve is determined to be in the valve closed state; When it is detected that the solenoid valve power supply voltage signal exists, the pressure sensor signal does not exist, and the radial position of the hose sleeve in the valve is in the preset open state, it is determined to be one or both of the control air source failure and the hose sleeve damage failure in the valve; When the solenoid valve power supply voltage and pressure sensor signal are detected at the same time, but the radial position of the hose sleeve in the valve is in the preset open state, it is determined to be one or more of the following: air source failure, hose sleeve damage failure, and hose sleeve incomplete closure failure; When the solenoid valve power supply voltage and the pressure sensor signal do not exist, and the radial position of the hose sleeve in the valve is in a preset open state, the valve is determined to be in a normal open state.

2. A method for detecting the working state of a pinch valve according to claim 1, characterized in that: The radial position of the hose sleeve in the valve is detected by a capacitance probe or a spring probe.

3. A method for detecting the working state of a pinch valve according to claim 2, characterized in that: When a capacitive probe is used for monitoring, when the solenoid valve power supply voltage and the pressure sensor signal do not exist, and the radial position of the hose sleeve in the valve is in the preset closed state, it is determined that the hose sleeve in the valve is damaged or material has entered the valve cavity, or both.

4. A method for detecting the working state of a pinch valve according to claim 1, characterized in that: The current status of the valve is also displayed through indicator lights of different colors, and the current status of the valve includes valve closed, valve fault and valve normally open.

5. A method for detecting the working state of a pinch valve according to claim 1, characterized in that: The sensor housing (7) is connected to the compressed air interface (4) via threads.

6. A method for detecting the working state of a pinch valve according to claim 1, characterized in that: The hose sleeve detection device is a capacitance probe rod (3) or a spring probe rod (8), and the capacitance probe rod (3) or the spring probe rod (8) is inserted into the pinch valve body (1) through a compressed air interface (4).

7. A method for detecting the working state of a pinch valve according to claim 1, characterized in that: A control circuit board (9) is also provided in the sensor housing (7), and the control circuit board (9) is provided with indicator lights for displaying different working states.

8. A method for detecting the working state of a pinch valve according to claim 7, characterized in that: The indicator light is arranged inside the sensor housing (7), and the sensor housing (7) is provided with a transparent outer cover for observing the indicator light.

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