Single-action pneumatic PST system

Abstract

The utility model relates to the technical field of pneumatic control systems, in particular to a single-action pneumatic PST system, which comprises a pneumatic actuating mechanism, a cam valve and an explosion-proof junction box, a valve position transponder is arranged at the front end of the pneumatic actuating mechanism, one end of the cam valve is communicated with a filtering pressure reducing valve, one end of the filtering pressure reducing valve is communicated with a safety valve, and the other end of the filtering pressure reducing valve is communicated with an explosion-proof junction box. And one end of the explosion-proof junction box is connected with a first electromagnetic valve and a second electromagnetic valve respectively. According to the improved single-action pneumatic PST system, the first electromagnetic valve, the hand-operated direction valve and the second electromagnetic valve are adopted, and when the single-action pneumatic PST system is used, flexible control can be conducted when the single-action pneumatic PST system faces complex working conditions and different operation requirements; the explosion-proof junction box and the energy accumulator are adopted, when the single-action pneumatic PST system is used, the electrical safety of the system in a dangerous environment can be guaranteed, meanwhile, the pressure of the system can be kept within a relatively stable range, and the stability of the system during use is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic control system technical field, concretely is a single action pneumatic PST system. BACKGROUND

[0002] Pneumatic control system is with compressed air as working medium, through to the gas pressure, flow, direction etc. Parameter control, realize various mechanical action and automation control system, it is widely used in industrial production, automation equipment, transportation and many other fields,

[0003] Single action pneumatic PST is the key part in this pneumatic control system, and single action pneumatic PST is a common pneumatic actuator, and is widely used in the field of industrial automation.

[0004] The inventor finds that the prior art has the following problems in the process of realizing the utility model: 1, the conventional single action pneumatic system only has simple on / off control, when facing complex working conditions and different operation requirements, cannot control flexibly, and the flexibility when using is poor;2, the conventional single action pneumatic system in flammable and explosive environment, the electric spark generated by the electrical circuit exists the risk of causing explosion, and the safety and stability are poor. UTILITY MODEL CONTENT

[0005] The utility model discloses a single action pneumatic PST system to solve the problems in the background art. To achieve the above object, the utility model provides the following technical scheme: a single action pneumatic PST system, including pneumatic actuator, cam valve and explosion-proof terminal box, the front end of pneumatic actuator is equipped with valve position back transmitter, one end of cam valve is communicated with filter pressure reducing valve, one end of filter pressure reducing valve is communicated with safety valve, one end of explosion-proof terminal box is connected with first electromagnetic valve and second electromagnetic valve respectively, one end of second electromagnetic valve is communicated with shuttle valve, one end of shuttle valve is communicated with hand-operated reversing valve and first 1 / 4 interface air control valve respectively, one end of first 1 / 4 interface air control valve is communicated with second 1 / 4 interface air control valve and cam valve respectively, one end of first electromagnetic valve is communicated with 3 / 4 interface air control valve, one end of 3 / 4 interface air control valve is communicated with fast discharge valve, one end of pneumatic actuator is communicated with throttle valve and hand-operated pump assembly respectively, one end of throttle valve is connected with energy accumulator.

[0006] Further preferably, the pneumatic actuator and the valve position back transmitter are electrically connected.

[0007] Further preferably, the first electromagnetic valve and the second electromagnetic valve are communicated with the cam valve.

[0008] Further preferably, the first electromagnetic valve and the second electromagnetic valve are pilot operated solenoid valves, and the pilot gas circuit is provided with a filter device.

[0009] Further preferably, one end of the explosion-proof junction box is electrically connected with the first electromagnetic valve and the second electromagnetic valve.

[0010] Further preferably, a wireless transmission mode is adopted between the valve position feedback device and the central control room to send the valve position signal.

[0011] Compared with the prior art, the utility model has the beneficial effects of:

[0012] In the utility model, when the single-acting pneumatic PST system is used, remote valve opening, remote valve closing, remote PST and PST on site can be realized through the first electromagnetic valve, the hand-operated reversing valve and the second electromagnetic valve, so that the flexibility of the system structure in use is improved, and the system can be flexibly controlled in the face of complex working conditions and different operation requirements.

[0013] In the utility model, when the single-acting pneumatic PST system is used, the explosion-proof junction box can effectively limit the electric sparks or electrical faults generated by the first electromagnetic valve and the second electromagnetic valve in the explosion-proof junction box, avoid the contact of the electric sparks or electrical faults with the flammable and explosive gas outside, greatly reduce the explosion risk, and ensure the electrical safety of the system in the dangerous environment. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model.

[0015] In the drawing, 1 is a pneumatic actuator, 2 is a valve position feedback device, 3 is a cam valve, 4 is a filter pressure reducing valve, 5 is a safety valve, 6 is an explosion-proof junction box, 7 is a first electromagnetic valve, 8 is a second electromagnetic valve, 9 is a first 1 / 4 interface air control valve, 10 is a second 1 / 4 interface air control valve, 11 is a shuttle valve, 12 is a hand-operated reversing valve, 13 is a 3 / 4 interface air control valve, 14 is a quick exhaust valve, 15 is an accumulator, 16 is a throttle valve, and 17 is a hand-operated pump assembly. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skill workers in the art without creative work fall within the protection scope of the utility model.

[0017] Please refer to Figure 1The utility model provides a technical scheme: a single -action pneumatic PST system, including pneumatic actuating mechanism 1, cam valve 3 and explosion -proof terminal box 6, the front end of pneumatic actuating mechanism 1 is equipped with valve position back transmitter 2, one end of cam valve 3 is communicated with filter pressure reducing valve 4, one end of filter pressure reducing valve 4 is communicated with safety valve 5, one end of explosion -proof terminal box 6 is connected with first solenoid valve 7 and second solenoid valve 8 respectively, one end of second solenoid valve 8 is communicated with shuttle valve 11, one end of shuttle valve 11 is communicated with manual reversing valve 12 and first 1 / 4 interface gas control valve 9 respectively, one end of first 1 / 4 interface gas control valve 9 is communicated with second 1 / 4 interface gas control valve 10 and cam valve 3 respectively, one end of first solenoid valve 7 is communicated with 3 / 4 interface gas control valve 13, one end of 3 / 4 interface gas control valve 13 is communicated with fast discharge valve 14, one end of pneumatic actuating mechanism 1 is communicated with throttle valve 16 and manual pump assembly 17 respectively, one end of throttle valve 16 is connected with energy accumulator 15.

[0018] In the embodiment, as shown in the figure, Figure 1 The pneumatic actuating mechanism 1 and the valve position back transmitter 2 are electrically connected. The pneumatic actuating mechanism 1 and the valve position back transmitter 2 realize signal transmission through electrical connection, improve the stability of signal transmission, can feedback the valve position state in real time, and facilitate the operator to know the working condition of the valve in time, so as to ensure the normal operation of the system.

[0019] In the embodiment, as shown in the figure, Figure 1 The first solenoid valve 7 and the second solenoid valve 8 are connected with the cam valve 3. The opening and closing state of the cam valve 3 can be controlled more directly and accurately. When the cam valve 3 needs to be switched quickly or adjusted accurately, the solenoid valve can quickly respond to the control signal, change the direction and flow of the gas flow, and then efficiently control the action of the cam valve 3, improve the response speed and control accuracy of the whole system, and meet the flexible control demand of the cam valve 3 under different working conditions.

[0020] In the embodiment, as shown in the figure, Figure 1 The first solenoid valve 7 and the second solenoid valve 8 are pilot solenoid valves, and the pilot gas circuit is provided with a filtering device. The pilot solenoid valve has the advantages of low power consumption, large flow and fast response speed, and can more efficiently control the on-off of the gas flow. The filtering device of the pilot gas circuit can prevent impurities from entering the pilot gas circuit, avoid the blockage of the pilot valve, ensure the normal work of the solenoid valve, and improve the accuracy and reliability of the system control.

[0021] In the embodiment, as shown in the figure, Figure 1 One end of the explosion -proof terminal box 6 is electrically connected with the first solenoid valve 7 and the second solenoid valve 8. Through the centralized connection of the explosion -proof terminal box 6, the electrical circuits of the two solenoid valves can be uniformly managed and maintained, and the laying and maintenance of the circuit are also facilitated, so that the stability and reliability of the electrical part of the system are improved.

[0022] In the embodiment, as shown in the figure,Figure 1 As shown, the valve position signal transmitter 2 transmits valve position signals wirelessly to the central control room; this reduces wiring costs and difficulties, making it particularly suitable for complex operating conditions or long-distance transmission scenarios. At the same time, it facilitates the later expansion and maintenance of the system, improves the system's flexibility and operability, and enables operators to obtain valve position information more promptly.

[0023] like Figure 1 As shown, firstly, during remote valve opening, the first solenoid valve 7 is energized, the valve opens, and the valve position feedback device 2 receives the open position signal, indicating the valve is open; the electrical signal must be continuous. Secondly, during remote valve closing, the first solenoid valve 7 is de-energized, the valve closes, and the valve position feedback device 2 receives the closed position signal, indicating the valve is closed. Thirdly, during remote PST, the valve can only be opened. The central control room sends a signal to the second solenoid valve 8 for a short period (the time required for the cam valve 3 to disengage from the cam valve 3 swing arm during the valve's return from the open to the closed position), and the valve automatically performs the PST action. Fourthly, during local PST, the valve can only be opened. The manual directional valve 12 is manually operated to switch the valve. During the valve's return from the open to the closed position, after the cam valve 3 toggle plate disengages from the cam valve 3 swing arm, the manual valve is operated again to switch the valve back to the open position, thus achieving PST.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. 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 preferred examples and are not intended to limit the 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 single acting pneumatic PST system comprising a pneumatic actuator (1), a cam valve (3) and an explosion-proof junction box (6), characterized in that: The front end of the pneumatic actuator (1) is provided with a valve position transducer (2), one end of the cam valve (3) is communicated with a filter pressure reducing valve (4), one end of the filter pressure reducing valve (4) is communicated with a safety valve (5), one end of the explosion-proof junction box (6) is connected with a first electromagnetic valve (7) and a second electromagnetic valve (8) respectively, one end of the second electromagnetic valve (8) is communicated with a shuttle valve (11), one end of the shuttle valve (11) is communicated with a manual reversing valve (12) and a first 1 / 4 interface air control valve (9) respectively, one end of the first 1 / 4 interface air control valve (9) is communicated with a second 1 / 4 interface air control valve (10) and a cam valve (3) respectively, one end of the first electromagnetic valve (7) is communicated with a 3 / 4 interface air control valve (13), one end of the 3 / 4 interface air control valve (13) is communicated with a quick exhaust valve (14), one end of the pneumatic actuator (1) is communicated with a throttle valve (16) and a manual pump assembly (17) respectively, one end of the throttle valve (16) is connected with an accumulator (15).

2. A single acting pneumatic PST system according to claim 1, characterized in that: The pneumatic actuator (1) is electrically connected with the valve position transducer (2).

3. A single acting pneumatic PST system according to claim 1, characterized in that: The first electromagnetic valve (7) and the second electromagnetic valve (8) are communicated with the cam valve (3).

4. A single acting pneumatic PST system according to claim 1, characterized in that: The first electromagnetic valve (7) and the second electromagnetic valve (8) are pilot operated electromagnetic valves, and the pilot air circuit is provided with a filter device.

5. A single acting pneumatic PST system according to claim 1, characterized in that: One end of the explosion-proof junction box (6) is electrically connected with the first electromagnetic valve (7) and the second electromagnetic valve (8).

6. A single acting pneumatic PST system according to claim 1, characterized in that: The valve position transducer (2) and the central control room adopt a wireless transmission mode to send valve position signals.

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