Online monitoring device for operation state of pneumatic actuator

Abstract

The utility model discloses an on-line monitoring device for the operating state of a pneumatic actuator, which is characterized by comprising a reversing valve, a first exhaust valve and a second exhaust valve, an air inlet of the reversing valve is connected with an air source, a first air outlet of the reversing valve is communicated with an air inlet of a first mechanical valve in a limiting device of the pneumatic actuator, and a second air outlet of the reversing valve is communicated with an air outlet of a second mechanical valve. A second air outlet of the reversing valve is communicated with an air inlet of a second mechanical valve in the limiting device, an air outlet of the first mechanical valve is communicated with an air inlet of a first exhaust valve, and an air outlet of the second mechanical valve is communicated with an air inlet of a second exhaust valve; an air vent of the first exhaust valve and an air vent of the second exhaust valve are respectively communicated with two air connecting ports on the pneumatic actuator in a one-to-one correspondence manner, and an exhaust port of the first exhaust valve and an exhaust port of the second exhaust valve are respectively connected with an exhaust indication mechanism; the pneumatic actuator has the advantages that the operation state of the pneumatic actuator can be monitored in real time through the exhaust indicating mechanism, so that operators can know the opening and closing conditions of the valve in time.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to an online monitoring device for the operating state of a pneumatic actuator. Background Art

[0002] A pneumatic actuator, also known as a pneumatic actuator or pneumatic device, is an actuator that uses air pressure to open and close valves. Pneumatic actuators must be installed on valves, which are often directly mounted on pipelines at the work site. Some work sites have harsh environments, such as high temperatures, toxic and hazardous gases, or occupy large areas. For these work sites, the pneumatic actuator control box is often installed in a control room for remote control. However, this also has certain drawbacks. Operators cannot monitor the operation of the pneumatic actuator in real time. If the pneumatic actuator becomes blocked (i.e., the pneumatic actuator is not exhausting air), the valve cannot be opened or closed. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an online monitoring device for the operating state of a pneumatic actuator, which can monitor the operating state of the pneumatic actuator in real time, so as to timely understand the opening and closing state of the valve.

[0004] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: an online monitoring device for the operating status of a pneumatic actuator, comprising a reversing valve, a first exhaust valve and a second exhaust valve, the air inlet of the reversing valve being connected to an air source, the first air outlet of the reversing valve being connected to the air inlet of a first mechanical valve in a limiting device of the pneumatic actuator, the second air outlet of the reversing valve being connected to the air inlet of the second mechanical valve in the limiting device, the air outlet of the first mechanical valve being connected to the air inlet of the first exhaust valve, the air outlet of the second mechanical valve being connected to the air inlet of the second exhaust valve, the air vent of the first exhaust valve and the air vent of the second exhaust valve being respectively connected to two air receiving ports on the pneumatic actuator in a one-to-one correspondence, and the exhaust port of the first exhaust valve and the exhaust port of the second exhaust valve are respectively connected to exhaust indicating mechanisms.

[0005] Furthermore, the exhaust indication mechanism is a wind wheel or impeller indicator, and the wind wheel or impeller indicator is connected to the exhaust port of the first exhaust valve or the exhaust port of the second exhaust valve through an air pipe.

[0006] Furthermore, the reversing valve is an electromagnetic reversing valve or a manual valve.

[0007] Furthermore, the exhaust port of the first exhaust valve and the exhaust port of the second exhaust valve are respectively connected to a stop valve.

[0008] Furthermore, a filter pressure reducing valve and an oil mist collector are connected in series between the air inlet of the reversing valve and the air source.

[0009] Compared with the prior art, the advantage of the present invention is that since the exhaust port of the first exhaust valve and the exhaust port of the second exhaust valve are respectively connected to the exhaust indicating mechanism, the operating status of the pneumatic actuator can be monitored in real time through the exhaust indicating mechanism, so that the operator can promptly understand the opening and closing status of the valve; in addition, the exhaust port of the first exhaust valve and the exhaust port of the second exhaust valve are respectively connected to the stop valve, and the exhaust flow rate of the exhaust valve can be adjusted through the stop valve to ensure the normal operation of the exhaust indicating mechanism and the accuracy of the exhaust indication. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0011] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0012] like Figure 1 As shown, an online monitoring device for the operating status of a pneumatic actuator includes a reversing valve 1, a first exhaust valve 2 and a second exhaust valve 3. A filter pressure reducing valve 5 and an oil mist collector 6 are connected in series between the air inlet of the reversing valve 1 and the air source 4. The first air outlet 11 of the reversing valve 1 is connected to the air inlet 81 of the first mechanical valve in the limit device 8 of the pneumatic actuator 7, and the second air outlet 12 of the reversing valve 1 is connected to the air inlet 82 of the second mechanical valve in the limit device 8. The air outlet 83 of the first mechanical valve is connected to the air inlet of the first exhaust valve 2, and the air outlet 84 of the second mechanical valve is connected to the air inlet of the second exhaust valve 3. The air vent of the first exhaust valve 2 and the air vent of the second exhaust valve 3 are respectively connected to the two air receiving ports 71 and 72 on the pneumatic actuator 7 in a one-to-one correspondence. The exhaust port of the first exhaust valve 2 and the exhaust port of the second exhaust valve 3 are respectively connected to an exhaust indicating mechanism 9 and a stop valve 10.

[0013] In the above embodiment, the exhaust indicator mechanism 9 can be an existing wind wheel or impeller indicator, which is connected to the exhaust port of the first exhaust valve 2 or the exhaust port of the second exhaust valve 3 via an air pipe. This allows the exhaust indicator mechanism 9 to be installed in the control room, making it convenient for operators to check the operating status of the pneumatic actuator. When the wind wheel or impeller indicator rotates, it indicates that the pneumatic actuator is exhausting normally and is in a normal operating state. If the wind wheel or impeller indicator does not rotate, it is necessary to arrange for operators to enter the work site to inspect the pneumatic actuator. In addition, the reversing valve can also be an electromagnetic reversing valve or a manual valve. If a manual valve is used, the manual valve can also be installed in the control room to facilitate operation by operators.

[0014] It should be noted that the limit device 8 of the present invention is a mechanism on the existing pneumatic actuator 7 for controlling the driving stroke of the pneumatic actuator 7, and the first mechanical valve and the second mechanical valve are both components of the limit device 8, which are used to control the on and off of the air circuit. The entire limit device 8 is also an existing component currently in use on the pneumatic actuator 7.

[0015] The working process of the online monitoring device of the present invention is as follows: the reversing valve 1 is controlled to make its first air outlet 11 discharge gas, and the gas enters the air inlet of the first exhaust valve 2 through the air inlet 81 and the air outlet 83 of the first mechanical valve in the limit device 8, and then enters the cylinder in the pneumatic actuator 7 from the air vent of the first exhaust valve 2 through the air connection port 71. The piston moves and drives the valve to open after being converted by the motion conversion mechanism in the pneumatic actuator 7. At the same time, the gas discharged from the cylinder enters the air vent of the second exhaust valve 3 through the air connection port 72, and enters the exhaust port of the second exhaust valve 3 from the exhaust port of the second exhaust valve 3. Gas indicating mechanism 9; and when the reversing valve 1 is controlled to discharge gas from its second gas outlet 12, the gas enters the gas inlet of the second exhaust valve 3 through the gas inlet 82 and the gas outlet 84 of the second mechanical valve in the limit device 8, and then enters the cylinder in the pneumatic actuator 7 from the gas vent of the second exhaust valve 3 through the gas connecting port 72. The piston moves in the opposite direction and drives the valve to close after being converted by the motion conversion mechanism in the pneumatic actuator 7. At the same time, the gas discharged from the cylinder enters the gas vent of the first exhaust valve 2 through the gas connecting port 71, and enters the exhaust indicating mechanism 9 from the exhaust port of the first exhaust valve 2.

[0016] The protection scope of the present invention includes but is not limited to the above embodiments, and its protection scope is subject to the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field fall within the protection scope of the present invention.

Claims

1. An online monitoring device for the operating status of a pneumatic actuator, characterized in that It includes a reversing valve, a first exhaust valve and a second exhaust valve, the air inlet of the reversing valve is connected to the air source, the first air outlet of the reversing valve is connected to the air inlet of the first mechanical valve in the limit device of the pneumatic actuator, the second air outlet of the reversing valve is connected to the air inlet of the second mechanical valve in the limit device, the air outlet of the first mechanical valve is connected to the air inlet of the first exhaust valve, the air outlet of the second mechanical valve is connected to the air inlet of the second exhaust valve, the air vent of the first exhaust valve and the air vent of the second exhaust valve are respectively connected to the two air connecting ports on the pneumatic actuator in a one-to-one correspondence, and the exhaust port of the first exhaust valve and the exhaust port of the second exhaust valve are respectively connected with exhaust indicating mechanisms.

2. The online monitoring device for the operating status of a pneumatic actuator according to claim 1, characterized in that: The exhaust indicating mechanism is a wind wheel or an impeller indicator, and the wind wheel or the impeller indicator is connected to the exhaust port of the first exhaust valve or the exhaust port of the second exhaust valve through an air pipe.

3. The online monitoring device for the operating status of a pneumatic actuator according to claim 1, characterized in that: The reversing valve is an electromagnetic reversing valve or a hand-operated valve.

4. The online monitoring device for the operating status of a pneumatic actuator according to claim 1, characterized in that: The exhaust port of the first exhaust valve and the exhaust port of the second exhaust valve are respectively connected to a stop valve.

5. The online monitoring device for the operating status of a pneumatic actuator according to claim 1, characterized in that: A filter pressure reducing valve and an oil mist generator are connected in series between the air inlet of the reversing valve and the air source.

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