Control system for high-frequency switch valve of polypropylene device

Abstract

The utility model belongs to the technical field of pneumatic control, and particularly relates to a control system for a high-frequency switch valve of a polypropylene device, which comprises a first pressure reducing valve, an electromagnetic valve, a locking valve, a first pneumatic control valve, a second pneumatic control valve, a third pneumatic control valve, a pneumatic actuator and a control valve. The air outlet end of the first pressure reducing valve is connected with the first pneumatic control valve and the locking valve through air pipes, the air source pipeline is provided with a branch air pipe connected with the locking valve, the electromagnetic valve is connected with the first pneumatic control valve through an air pipe, and the air pipe, connected with the locking valve, of the first pressure reducing valve is provided with a branch air pipe connected with the electromagnetic valve. The first pneumatic control valve is connected with the second pneumatic control valve and the third pneumatic control valve through air pipes, the second pneumatic control valve and the third pneumatic control valve are connected with the pneumatic actuator through air pipes, the pneumatic actuator is connected with the control valve, and the locking valve is connected with the second pneumatic control valve and the third pneumatic control valve through air pipes. The control system can meet high-frequency use under the PDS working condition and is low in failure rate.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic control, and in particular relates to a control system for high-frequency switching valves of a polypropylene device. Background Art

[0002] Air-controlled valves operating under PDS conditions must not only withstand high-frequency, rapid actuation but also maintain a durable seal. Furthermore, the medium may contain solid particles such as powder, forcing the valves to withstand wear and sticking. Due to the critical installation location and demanding operating conditions, this type of valve has been dominated by imported brands such as ARGUS, KTM, and METSO. Depending on the PDS operating conditions, the valve's annual actuation frequency can range from 1 to 2 million times. Valve lifespan and sealing performance are crucial indicators of valve performance.

[0003] However, due to actuator limitations, domestic PDS valves cannot meet the annual operation frequency requirement of 1 million times, and the design life of the spring return cylinder cannot meet the requirement of 2 years of trouble-free operation of the polypropylene device. Utility Model Content

[0004] The purpose of this utility model is to solve the problem of short service life of the actuator described in the above background technology. A new control system for high-frequency switching valves of a polypropylene device is proposed. The control system uses a double-acting actuator and improves the control system to realize the reset of the actuator, meeting the requirements of high-frequency use and trouble-free operation of the device.

[0005] The technical solution adopted to achieve the above purpose is a control system for high-frequency switching valves of a polypropylene device, the control system comprising a first pressure reducing valve, a solenoid valve, a locking valve, a first air-controlled valve, a second air-controlled valve, a third air-controlled valve, a pneumatic actuator and a control valve.

[0006] The air inlet end of the first pressure reducing valve is connected to the air source pipeline, and the air outlet end of the first pressure reducing valve is connected to the first air-controlled valve and the locking valve respectively through the air pipe. A branch air pipe is provided on the air source pipeline and connected to the locking valve. The solenoid valve is connected to the first air-controlled valve through the air pipe. A branch air pipe is provided on the air pipe connected to the locking valve and connected to the solenoid valve. The first air-controlled valve is respectively connected to the second air-controlled valve and the third air-controlled valve through the air pipe. The second air-controlled valve and the third air-controlled valve are connected to the pneumatic actuator through the air pipe. The pneumatic actuator is connected to the control valve. The locking valve is respectively connected to the second air-controlled valve and the third air-controlled valve through the air pipe.

[0007] In the above technical solution, the return spring of the pneumatic actuator is cancelled, and the air circuit switching of the first air-controlled valve is controlled by the solenoid valve to realize the switch reset of the pneumatic actuator, so that the pneumatic actuator can perform 2 million uninterrupted high-frequency actions. By setting the locking valve, it is ensured that the actuator is in the closed position when the air source fails, thereby improving the operating stability of the PDS valve.

[0008] Furthermore, the solenoid valve is connected to an external circuit for controlling the switch of the solenoid valve.

[0009] Furthermore, the control system also includes a one-way valve, an air tank and a second pressure reducing valve, the one-way valve is connected to the air source pipeline, the one-way valve is connected to the air tank through an air pipe, the air tank is connected to the second pressure reducing valve through an air pipe, and the second pressure reducing valve is connected to the second air control valve through an air pipe.

[0010] In the above technical solution, the gas source is stored in a gas tank to prevent the device from malfunctioning when the gas source pipeline loses gas, thereby improving the safety and stability of the control system.

[0011] Furthermore, the pneumatic actuator is a double-acting pneumatic actuator, which includes a cavity air inlet and two piston air inlets. The second air-controlled valve is connected to the two piston air inlets respectively through air pipes, and the third air-controlled valve is connected to the cavity air inlet through an air pipe.

[0012] In the above technical solution, when the third air-controlled valve is ventilated, gas enters from the cavity air inlet, and the pneumatic actuator opens the control valve; when the second air-controlled valve is ventilated, gas enters from the two piston air inlets, pushing the two pistons of the pneumatic actuator, resetting the pneumatic actuator, and thus closing the control valve.

[0013] Furthermore, the first air-controlled valve is a two-position five-way air-controlled valve, which includes a first air inlet, a first control port, a first air outlet, a second air outlet, a first exhaust port and a second exhaust port. The first air inlet is connected to the first pressure reducing valve through an air pipe, the first control port is connected to the solenoid valve through an air pipe, the first air outlet is connected to the second air-controlled valve through an air pipe, and the second air outlet is connected to the third air-controlled valve through an air pipe.

[0014] In the above technical solution, the first air-controlled valve is used to switch the air circuit.

[0015] Furthermore, the control system further includes an exhaust valve, and the first exhaust port and the second exhaust port are connected to the exhaust valve.

[0016] In the above technical solution, the opening and closing speed of the valve is controlled by the exhaust valve to reduce pipeline vibration.

[0017] Furthermore, the second air-controlled valve is a two-position three-way air-controlled valve, which includes a second air inlet, a second control port, a third air outlet and a third exhaust port. The second air inlet is connected to the first air-controlled valve through an air pipe, the second control port is connected to the locking valve through an air pipe, and the third air outlet is connected to the pneumatic actuator through an air pipe.

[0018] Furthermore, the third air-controlled valve is a two-position three-way air-controlled valve, and the third air-controlled valve includes a third air inlet, a third control port, a fourth air outlet and a fourth exhaust port. The third air inlet is connected to the first air-controlled valve through an air pipe, the third control port is connected to the locking valve through an air pipe, and the fourth air outlet is connected to the pneumatic actuator through an air pipe.

[0019] Furthermore, the control system also includes an air circuit speed regulating silencer, and the third exhaust port and the fourth exhaust port are connected to the air circuit speed regulating silencer.

[0020] In the above technical solution, the air circuit speed regulating silencer is used to reduce the exhaust noise at the exhaust port of the air control valve.

[0021] Furthermore, the control valve is a ball valve.

[0022] Furthermore, the control system also includes a control center, and the pneumatic actuator is electrically connected to the control center.

[0023] In the above technical solution, the pneumatic actuator transmits the switch signal to the control center through electrical connection for display, making it convenient for staff to monitor the operating status of the control system.

[0024] The advantages of the present invention are:

[0025] 1. The utility model adopts multiple separate valves and other components for installation, which is convenient for daily maintenance of the instrument, reduces the amount of repair and maintenance failures, and reduces the overall number of spare parts for instrument maintenance.

[0026] 2. The utility model cancels the original actuator spring design and adopts a double-acting pneumatic actuator. Through the air circuit modification, the double-acting pneumatic actuator can realize switch reset, thereby meeting the demand of 2 million uninterrupted high-frequency actions, extending the service life of the actuator and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of the control system of the utility model.

[0029] Illustration: 1. First pressure reducing valve, 2. Solenoid valve, 3. Locking valve, 4. First air control valve, 5. Second air control valve, 6. Third air control valve, 7. Pneumatic actuator, 8. Control valve, 9. Air source pipeline, 10. Check valve, 11. Air tank, 12. Second pressure reducing valve. DETAILED DESCRIPTION

[0030] In order to enable people in this technical field to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only an embodiment of a part of the utility model rather than all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] like Figure 1 As shown, a control system for high-frequency switching valves of a polypropylene device is shown, which consists of a first pressure reducing valve 1, a solenoid valve 2, a locking valve 3, a first air-controlled valve 4, a second air-controlled valve 5, a third air-controlled valve 6, a pneumatic actuator 7, a control valve 8, a one-way valve 10, an air storage tank 11, a second pressure reducing valve 12, an exhaust valve, an air circuit speed regulating silencer and a control center. The pneumatic actuator is a double-acting pneumatic actuator, which includes a cavity air inlet and two piston air inlets; the first air-controlled valve is a two-position five-way air-controlled valve, which includes a first air inlet, a first control port, a first air outlet, a second air outlet, a first exhaust port and a second exhaust port; the second air-controlled valve is a two-position three-way air-controlled valve, which includes a second air inlet, a second control port, a third air outlet and a third exhaust port; the third air-controlled valve is a two-position three-way air-controlled valve, which includes a third air inlet, a third control port, a fourth air outlet and a fourth exhaust port.

[0033] The air inlet end of the first pressure reducing valve is connected to the air source pipeline 9, which is used to provide an air source as power; the air outlet end of the first pressure reducing valve is connected to the first air inlet port and the locking valve of the first air-controlled valve through an air pipe, and a branch air pipe is provided on the air source pipeline to connect to the locking valve. The solenoid valve is connected to the first control port of the first air-controlled valve through the air pipe. A branch air pipe is provided on the air pipe connecting the first pressure reducing valve and the locking valve to connect to the solenoid valve. The solenoid valve is connected to an external circuit to control the switch of the solenoid valve.

[0034] The first air outlet of the first air-controlled valve is connected to the second air inlet of the second air-controlled valve through an air pipe, and the second air outlet is connected to the third air inlet of the third air-controlled valve through an air pipe.

[0035] The second control port of the second air-controlled valve is connected to the locking valve through an air pipe, and the third control port of the third air-controlled valve is connected to the locking valve through an air pipe.

[0036] The third air outlet of the second air control valve is connected to the two piston air inlets of the pneumatic actuator through air pipes respectively, and the fourth air outlet of the third air control valve is connected to the cavity air inlet of the pneumatic actuator through air pipes.

[0037] The one-way valve is connected to the gas source pipeline, the one-way valve is connected to the gas storage tank through the gas pipe, the gas storage tank is connected to the gas inlet end of the second pressure reducing valve through the gas pipe, and the gas outlet end of the second pressure reducing valve is connected to the second gas control valve through the gas pipe.

[0038] The first exhaust port and the second exhaust port are respectively connected to an exhaust valve, and the third exhaust port and the fourth exhaust port are respectively connected to an air path speed regulating muffler.

[0039] In this embodiment, the pneumatic actuator is electrically connected to the control center.

[0040] In this embodiment, the control valve is a ball valve, but is not limited thereto.

[0041] In this embodiment, the pneumatic actuator adopts a C-type aluminum alloy actuator produced by Wuxi Shenghans Pneumatic Valve Actuator Manufacturing Co., Ltd.

[0042] The working principle of this utility model:

[0043] The instrument air source provided by the factory enters from the gas source pipeline and is divided into two paths, one path enters the main gas line, and the other path enters the one-way valve and then enters the gas tank for gas storage; the gas entering the main gas line is divided into two paths after passing through the first pressure reducing valve, one path goes to the locking valve, which is used to switch the second and third gas control valves when the gas source loses gas, and the other path goes to the first gas control valve.

[0044] When the solenoid valve is energized, the first air-controlled valve switches the air path so that the gas flows to the third air-controlled valve, and the pneumatic actuator opens the control valve; when the solenoid valve loses power, the first air-controlled valve does not switch the air path, the gas flows to the second air-controlled valve, and the pneumatic actuator closes the control valve.

[0045] When the gas source fails, the main gas circuit has no driving gas source. Due to the presence of the locking valve, the first gas control valve does not switch the gas circuit and returns to the fault position. Due to the presence of the one-way valve, the gas tank passes the gas into the second gas control valve, closing the control valve.

[0046] Finally, it should be noted that the present embodiment is intended only to illustrate the present invention and does not limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A control system for high-frequency valve switching in a polypropylene plant, characterized by: The control system comprises a first pressure reducing valve (1), a solenoid valve (2), a locking valve (3), a first air control valve (4), a second air control valve (5), a third air control valve (6), a pneumatic actuator (7) and a control valve (8), The air inlet end of the first pressure reducing valve is connected to the air source pipeline (9), and the air outlet end of the first pressure reducing valve is connected to the first air control valve and the locking valve respectively through an air pipe. The air source pipeline is provided with a branch air pipe connected to the locking valve. The solenoid valve is connected to the first air control valve through the air pipe. The air pipe connected to the first pressure reducing valve and the locking valve is provided with a branch air pipe connected to the solenoid valve. The first air control valve is connected to the second air control valve and the third air control valve respectively through the air pipe. The second air control valve and the third air control valve are connected to the pneumatic actuator through the air pipe. The pneumatic actuator is connected to the control valve. The locking valve is connected to the second air control valve and the third air control valve respectively through the air pipe.

2. The control system according to claim 1, characterized in that: The control system further comprises a one-way valve (10), an air storage tank (11) and a second pressure reducing valve (12), wherein the one-way valve is connected to the air source pipeline, the one-way valve is connected to the air storage tank via an air pipe, the air storage tank is connected to the second pressure reducing valve via an air pipe, and the second pressure reducing valve is connected to the second air control valve via an air pipe.

3. The control system according to claim 1, characterized in that: The pneumatic actuator is a double-acting pneumatic actuator, which includes a cavity air inlet and two piston air inlets. The second air-controlled valve is connected to the two piston air inlets respectively through air pipes, and the third air-controlled valve is connected to the cavity air inlet through an air pipe.

4. The control system according to claim 1, characterized in that: The first air-controlled valve is a two-position five-way air-controlled valve, which includes a first air inlet, a first control port, a first air outlet, a second air outlet, a first exhaust port and a second exhaust port. The first air inlet is connected to the first pressure reducing valve through an air pipe, the first control port is connected to the solenoid valve through an air pipe, the first air outlet is connected to the second air-controlled valve through an air pipe, and the second air outlet is connected to the third air-controlled valve through an air pipe.

5. The control system according to claim 4, characterized in that: The control system further includes an exhaust valve, and the first exhaust port and the second exhaust port are connected to the exhaust valve.

6. The control system according to claim 1, characterized in that: The second air-controlled valve is a two-position three-way air-controlled valve, which includes a second air inlet, a second control port, a third air outlet and a third exhaust port. The second air inlet is connected to the first air-controlled valve through an air pipe, the second control port is connected to the locking valve through an air pipe, and the third air outlet is connected to the pneumatic actuator through an air pipe.

7. The control system according to claim 6, characterized in that: The third air-controlled valve is a two-position three-way air-controlled valve, and the third air-controlled valve includes a third air inlet, a third control port, a fourth air outlet and a fourth exhaust port. The third air inlet is connected to the first air-controlled valve through an air pipe, the third control port is connected to the locking valve through an air pipe, and the fourth air outlet is connected to the pneumatic actuator through an air pipe.

8. The control system according to claim 7, characterized in that: The control system further includes an air circuit speed regulating silencer, and the third exhaust port and the fourth exhaust port are connected to the air circuit speed regulating silencer.

9. The control system according to claim 1, characterized in that: The control valve is a ball valve.

10. The control system according to claim 1, characterized in that: The control system further includes a control center, and the pneumatic actuator is electrically connected to the control center.

Images