阅读说明：本技术 一种夹管阀工作状态检测装置及检测方法 (Device and method for detecting working state of pinch valve ) 是由 邓崴 于 2020-05-18 设计创作，主要内容包括：本发明公开了一种夹管阀工作状态检测装置及检测方法：包括传感器壳体、电磁阀及用于检测阀内胶管套位置的胶管套检测装置,夹管阀设有压缩空气接口,传感器壳体连接于压缩空气接口,传感器壳体内还设有用于检测控制气压的压力传感器膜片；胶管套检测装置是电容探杆或弹簧探杆,电容探杆或弹簧探杆通过压缩空气接口插入至夹管阀阀体。本发明通过对气源状态及阀内胶管套的径向位置信号进行采集,并充分考虑夹管阀在运行过程中可能出现的故障,然后得出气源状态、阀内胶管套的径向位置信号与夹管阀工作状态的对应关系,实现对夹管阀工作状态的全方位监测。(The invention discloses a device and a method for detecting the working state of a pinch valve, wherein the device comprises the following components: the device comprises a sensor shell, an electromagnetic valve and a rubber sleeve detection device for detecting the position of a rubber sleeve in the valve, wherein a pinch valve is provided with a compressed air interface, the sensor shell is connected with the compressed air interface, and a pressure sensor diaphragm for detecting and controlling air pressure is also arranged in the sensor shell; the rubber 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. According to the invention, the air source state and the radial position signal of the rubber pipe sleeve in the valve are acquired, the possible faults of the pinch valve in the operation process are fully considered, and then the corresponding relation between the air source state, the radial position signal of the rubber pipe sleeve in the valve and the working state of the pinch valve is obtained, so that the omnibearing monitoring of the working state of the pinch valve is realized.)

1. The utility model provides a pinch valve operating condition detection device which characterized in that: the device comprises a sensor shell (7), an electromagnetic valve (6) and a rubber sleeve detection device for detecting the position of a rubber sleeve in a valve, wherein the pinch valve is provided with a compressed air interface (4), the sensor shell (7) is connected with the compressed air interface (4), and a pressure sensor diaphragm (5) for detecting and controlling air pressure is also arranged in the sensor shell (7);

and the working port of the electromagnetic valve (6) is communicated with a control air source and the sensor shell (7).

2. The pinch valve operation state detection device according to claim 1, wherein: the sensor housing (7) is connected to the compressed air connection (4) by means of a thread.

3. The pinch valve operation state detection device according to claim 1, wherein: the rubber 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).

4. The pinch valve operation state detection device according to claim 1, wherein: still be equipped with control scheme board (9) in sensor housing (7), control scheme board (9) are equipped with the pilot lamp that is used for showing different operating condition.

5. The pinch valve operation state detection device according to claim 4, wherein: the indicator light is arranged inside the sensor shell (7), and the sensor shell (7) is provided with a transparent outer cover for observing the indicator light.

6. A method for detecting the working state of a pinch valve is characterized in that:

detecting the power supply voltage of the electromagnetic valve, a pressure sensor signal and a radial position signal of the rubber sleeve in the valve in real time;

when detecting that both a power supply voltage signal and a pressure sensor signal of the electromagnetic valve exist and the radial position of the rubber sleeve in the valve is at a preset closing position, judging the pinch valve to be in a valve closing state;

when detecting that a power supply voltage signal of the electromagnetic valve exists, a pressure sensor signal does not exist, and the radial position of the rubber pipe sleeve in the valve is in a preset opening state, judging to be one or two of a control air source fault and a valve rubber pipe sleeve damage fault;

when the power supply voltage of the electromagnetic valve and the signals of the pressure sensor are detected simultaneously, but the radial position of the rubber pipe sleeve in the valve is in a preset opening state, one or more of a gas source fault, a damage fault of the rubber pipe sleeve in the valve and a fault that the rubber pipe sleeve in the valve is not completely closed are judged;

when the power voltage of the electromagnetic valve and the signal of the pressure sensor do not exist and the radial position of the rubber sleeve in the valve is in a preset opening state, the valve is judged to be in a normal opening state.

7. The method for detecting the operating state of the pinch valve according to claim 6, wherein: the radial position of the rubber sleeve in the valve is detected through a capacitance probe rod or a spring probe rod.

8. The method for detecting the operating state of the pinch valve according to claim 7, wherein: when the capacitance probe rod is adopted for monitoring, when the power supply voltage of the electromagnetic valve and the signal of the pressure sensor do not exist, and the radial position of the rubber pipe sleeve in the valve is in a preset closing state, one or two of a failure of the rubber pipe sleeve in the valve and the entering of materials into the valve cavity are judged.

9. The method for detecting the operating state of the pinch valve according to claim 6, wherein: the current state of the valve is displayed through indicator lights with different colors, and at least comprises valve closing, valve failure and normal valve opening.

Technical Field

The invention relates to the technical field of pinch valves, in particular to a device and a method for detecting the working state of a pinch valve.

Background

The pinch valve mainly comprises a valve body shell and a rubber sleeve. When the control medium is not input, the cavity between the rubber sleeve and the valve body is communicated with the atmosphere, the rubber sleeve is in an outward expansion state under the action of fluid pressure and the elasticity of the material, and a material conveying channel in the rubber sleeve is opened. When the control medium enters the cavity between the rubber hose sleeve and the valve body, the rubber hose sleeve deforms under the pressure of the control medium, a material conveying channel in the rubber 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 rubber hose sleeve is opened again. Therefore, the opening and closing of the valve channel are realized by using the control medium with pressure. The control medium may be compressed air, hydraulic oil, hydraulic pressure, or the like.

The pinch valve series products have no moving sealing surface and can not leak; the method is resistant to particle corrosion, and can not block when liquid and powder materials containing fibers are conveyed. The pneumatic pinch valve is suitable for various pneumatic conveying systems, and the application fields of the pneumatic pinch valve comprise a cement bin, pigment and particle treatment, ceramic, glass and plastic industry, sewage treatment, pharmaceutical industry, food industry and wine brewing industry. But also widely applied to batching systems and weighing systems, powder spraying systems, vacuum toilet systems, vacuum conveying systems, suction and compressed air control systems.

Different from other kinds of valves, the pinch valve cannot directly observe the closing state of the rubber sleeve from the valve body shell, and if the pressure of a control medium is reduced, the control medium cannot completely close a material channel, so that material leakage of the pinch valve is caused. Moreover, even if the control medium pressure is supplied normally, the material pressure in the material channel fluctuates greatly, and when the material pressure is close to the control medium pressure, the rubber pipe sleeve expands due to the expansion elasticity of the rubber pipe sleeve, so that the material leakage of the pinch valve is caused. On the other hand, the pinch valve rubber sleeve is damaged after long-term use, so that the control medium flows into the material channel or the material reversely enters the control medium system. For the above reasons, the prior art is generally unable to monitor the operation and failure status of the pinch valve, and the main reason is that the above factors are not fully considered.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a device and a method for detecting the working state of a pinch valve, and solves the problem that the working state and the fault state of the pinch valve cannot be monitored in the prior art.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the utility model provides a pinch valve operating condition detection device which characterized in that: the device comprises a sensor shell, an electromagnetic valve and a rubber sleeve detection device for detecting the position of a rubber sleeve in the valve, wherein a pinch valve is provided with a compressed air interface, the sensor shell is connected with the compressed air interface, and a pressure sensor diaphragm for detecting and controlling air pressure is also arranged in the sensor shell;

the working port of the electromagnetic valve is communicated with the control air source and the sensor shell.

Preferably, the pinch valve operating state detecting device of the present invention: the sensor housing is connected to the compressed air port by a screw thread.

Preferably, the pinch valve operating state detecting device of the present invention: the rubber 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.

Preferably, the pinch valve operating state detecting device of the present invention: still be equipped with the control scheme board in the sensor casing, the control scheme board is equipped with the pilot lamp that is used for showing different operating condition.

Preferably, the pinch valve operating state detecting device of the present invention: the pilot lamp sets up in sensor housing's inside, and sensor housing is equipped with the transparent dustcoat that is used for surveing the pilot lamp.

A method for detecting the working state of a pinch valve comprises the following steps:

detecting the power supply voltage of the electromagnetic valve, a pressure sensor signal and a radial position signal of the rubber sleeve in the valve in real time;

when detecting that both a power supply voltage signal and a pressure sensor signal of the electromagnetic valve exist and the radial position of the rubber sleeve in the valve is at a preset closing position, judging the pinch valve to be in a valve closing state;

when detecting that a power supply voltage signal of the electromagnetic valve exists, a pressure sensor signal does not exist, and the radial position of the rubber pipe sleeve in the valve is in a preset opening state, judging to be one or two of a control air source fault and a valve rubber pipe sleeve damage fault;

when the power supply voltage of the electromagnetic valve and the signals of the pressure sensor are detected simultaneously, but the radial position of the rubber pipe sleeve in the valve is in a preset opening state, one or more of a gas source fault, a damage fault of the rubber pipe sleeve in the valve and a fault that the rubber pipe sleeve in the valve is not completely closed are judged;

when the power voltage of the electromagnetic valve and the signal of the pressure sensor do not exist and the radial position of the rubber sleeve in the valve is in a preset opening state, the valve is judged to be in a normal opening state.

Preferably, the method for detecting the operating state of the pinch valve comprises the following steps: the radial position of the rubber sleeve in the valve is detected through a capacitance probe rod or a spring probe rod.

Preferably, the method for detecting the operating state of the pinch valve comprises the following steps: when the capacitance probe rod is adopted for monitoring, when the power supply voltage of the electromagnetic valve and the signal of the pressure sensor do not exist, and the radial position of the rubber pipe sleeve in the valve is in a preset closing state, one or two of a failure of the rubber pipe sleeve in the valve and the entering of materials into the valve cavity are judged.

Preferably, the method for detecting the operating state of the pinch valve comprises the following steps: the current state of the valve is displayed through indicator lights with different colors, and at least comprises valve closing, valve failure and normal valve opening.

The invention achieves the following beneficial effects:

compared with the prior art, the invention can monitor the working state and the fault state of the pinch valve in real time and feed back the working state and the fault state to a user. According to the invention, the air source state (including the power supply voltage of the electromagnetic valve and the signal of the pressure sensor) and the radial position signal of the rubber pipe sleeve in the valve are collected, the possible faults of the pinch valve in the operation process are fully considered, and then the corresponding relation between the air source state, the radial position signal of the rubber pipe sleeve in the valve and the working state of the pinch valve is obtained, so that the omnibearing monitoring of the working state of the pinch valve is realized.

Aiming at the position of a rubber pipe sleeve in the valve, the invention provides two monitoring modes of a capacitance probe rod and a spring probe rod, and the two monitoring modes can be selected according to actual requirements in practical application.

Drawings

FIG. 1 is a schematic view of a pinch valve of the present invention in a closed position (capacitive probe);

FIG. 2 is a schematic view of a pinch valve of the present invention in an open state (capacitive probe);

FIG. 3 is a schematic view of the pinch valve of the present invention in an open position (spring probe);

FIG. 4 is a schematic view of the pinch valve of the present invention in an open position (spring probe);

the meaning of the reference numerals: 1-a pinch valve body; 2-rubber sleeve in valve; 3-a capacitive probe; 4-compressed air interface; 5-a pressure sensor diaphragm; 6-electromagnetic valve; 7-a sensor housing; 8-spring feeler lever; 9-control circuit board.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 4: the embodiment discloses a pinch valve operating condition detection device, including sensor housing 7, solenoid valve 6 and be used for detecting the rubber tube cover detection device of the interior rubber tube cover position of valve, the pinch valve is equipped with compressed air interface 4, and sensor housing 7 is connected in compressed air interface 4, still is equipped with the pressure sensor diaphragm 5 that is used for detecting control air pressure in the sensor housing 7.

The working port of the electromagnetic valve 6 is communicated with a control air source and the sensor shell 7, and the control air source is communicated or disconnected with the sensor shell 7 through the electromagnetic valve 6.

The sensor housing 7 is screwed to the compressed air connection 4.

The rubber 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. When the capacitance probe rod 3 is adopted, the capacitance probe rod 3 can be monitored in a non-contact mode without being in contact with the rubber sleeve 2 in the valve, and the specific monitoring method belongs to the prior art. When the position of the rubber pipe sleeve is monitored by the capacitance probe rod 3, the capacitance probe rod 3 can be monitored in a non-contact mode without always being in a contact state with the rubber pipe sleeve 2 in the valve. When the spring probe 8 is used for monitoring the position of the rubber sleeve 2 in the valve, the other end of the spring probe 8 (inside the sensor housing 7) is also provided with a position sensor for detecting the position of the spring probe 8.

A control circuit board 9 is also arranged in the sensor shell 7, and the control circuit board 9 is provided with indicator lights for displaying different working states. For example, green is displayed when the valve is normally closed, yellow is displayed when the valve is failed, and red is displayed when the valve is red. When the indicator light is disposed inside the sensor housing 7, the sensor housing 7 is provided with a transparent cover for observing the indicator light, which needs to be disposed on the sensor housing 7 in order to observe the position of the internal indicator light. The first embodiment is as follows:

the embodiment discloses a method for detecting the working state of a pinch valve, and the embodiment detects the position of a rubber sleeve 2 in a valve through a capacitance probe rod 3. The specific control strategy is shown in the following table:

the control system detects the power supply voltage of the electromagnetic valve, the signal of the pressure sensor and the radial position signal of the rubber sleeve in the valve in real time.

1. When detecting that both a power supply voltage signal and a pressure sensor signal (which can be detected by a pressure sensor diaphragm 5) of the electromagnetic valve 2 exist and the radial position of the rubber tube sleeve in the valve is at a preset closing position, the control gas source is considered to be normal, the electromagnetic valve 6 is in an opening state and the rubber tube sleeve 2 in the valve is at a preset closing position of a system, and at the moment, the pinch valve is judged to be in a valve closing state.

2. When the existence of a power supply voltage signal of the electromagnetic valve and the absence of a signal of a pressure sensor are detected, and the radial position of the rubber tube sleeve 2 in the valve is in a preset opening state, the electromagnetic valve 6 is in the opening state, but the pressure of an air source cannot be detected, so that two possibilities exist, namely, the air source is opened, but the air leakage phenomenon occurs between the pinch valve body 1 and the rubber tube sleeve 2 in the valve, and the rubber tube sleeve 2 in the valve is considered to be damaged because the pinch valve body 1 is made of a metal material and cannot be damaged generally; and secondly, the rubber sleeve 2 in the valve is not damaged, but the air source has a fault, wherein the fault of the air source comprises that the pipeline is damaged, the air compressor does not work or fails, and the electromagnetic valve 6 is electrified but does not act. Both of the above fault conditions may also be present simultaneously.

3. When the power supply voltage of the electromagnetic valve and the signals of the pressure sensor are detected simultaneously, but the radial position of the rubber pipe sleeve in the valve is in a preset opening state, one or more of air source faults, damage faults of the rubber pipe sleeve in the valve and incomplete closing faults of the rubber pipe sleeve in the valve are judged.

The concrete explanation is that: the air source faults comprise pipeline damage, no work or fault of the air compressor, and electrification but no action of the electromagnetic valve 6; the broken rubber sleeve in the valve usually means that the rubber sleeve is broken, but the broken rubber sleeve can still trigger the capacitance probe rod 3, if the rubber sleeve is broken, the working fluid enters the inside of the sensor shell 7, and the signal of the pressure sensor is likely to be normal. The reason that the valve inner rubber sleeve is not completely closed means that although the air source and the valve inner rubber sleeve are normal, the pressure of working fluid is too high, and a certain elastic force exists in the valve inner rubber sleeve 2, so that the valve inner rubber sleeve 2 is likely to be pushed open, a small amount of gaps exist in the valve inner rubber sleeve 2, the valve inner rubber sleeve is not completely closed, and the air pressure of the air source is increased.

4. When the power supply voltage of the electromagnetic valve and the signal of the pressure sensor do not exist and the radial position of the rubber pipe sleeve in the valve is in a preset closing state, one or two of a damage fault of the rubber pipe sleeve in the valve and the material entering the valve cavity are judged. The concrete explanation is that: if the power supply voltage of the electromagnetic valve does not exist, the electromagnetic valve is not electrified, the control air pressure does not enter the pinch valve body 1, then a signal of the pressure sensor does not exist, if the radial position of the rubber sleeve 2 in the valve can be monitored to be in a preset closing state, the rubber sleeve 2 in the valve is considered to be damaged, the damaged rubber sleeve triggers the capacitance probe rod 3, and the possibility that the rubber sleeve 2 in the valve is damaged all the time, but the capacitance probe rod 3 is triggered by foreign matters in the working fluid (or inside the working fluid) exists.

5. When the power voltage of the electromagnetic valve and the signal of the pressure sensor do not exist and the radial position of the rubber sleeve in the valve is in a preset opening state, the valve is judged to be in a normal opening state.

Aiming at the different valve states, the current state of the valve is displayed through the indicating lamps with different colors, and the current state of the valve at least comprises valve closing, valve failure and normal valve opening; in addition, because there are many kinds of valve failures, different failures can be displayed in more detail, and a user can be informed of a specific failure type by adding a failure code alarm mode.