CN112066075A - Air circuit for pneumatic actuator - Google Patents
Air circuit for pneumatic actuator Download PDFInfo
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- CN112066075A CN112066075A CN202010856526.5A CN202010856526A CN112066075A CN 112066075 A CN112066075 A CN 112066075A CN 202010856526 A CN202010856526 A CN 202010856526A CN 112066075 A CN112066075 A CN 112066075A
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- Prior art keywords
- air
- pneumatic
- valve
- module
- keeping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/124—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated
- F16K31/1245—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated with more than one valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A gas circuit for a pneumatic actuator comprises a gas inlet unit, a positioning unit, a valve unit and a pneumatic actuator which are connected in series on a gas source connecting pipeline; the air inlet unit is connected with an air source; the valve unit comprises two pneumatic control valves for respectively supplying air to and from the valve unit; the positioning unit is used for realizing the adjustment of the valve unit and comprises a power-off position-keeping module and a gas-off position-keeping module; the power-off position-keeping module can play a position-keeping role in power failure or power failure; the two ends of the power-off position-keeping module are respectively connected with the air source and the pneumatic control valve; the air-break and position-keeping module can play a position-keeping role when an air source fails or is cut off; one end of the air-break and position-protection module is connected with the air-break and position-protection module, the other end of the air-break and position-protection module is connected between the air inlet unit and the valve unit, and the third end of the air-break and position-protection module is connected with an air source. Therefore, the positioning unit can provide a position-keeping function when power and gas are cut off.
Description
Technical Field
The invention relates to a pneumatic actuating component, in particular to an air path for a pneumatic actuating mechanism.
Background
The pneumatic actuating mechanism is an automatic actuator taking compressed air as power energy. The flow rate of the regulating fluid is directly changed through the received signals, so that the automation of the production process is realized. However, various sudden conditions, such as power failure or air source failure, often occur in the production process, and at this time, it is necessary to automatically close the air path to the pneumatic actuator to maintain the current valve position opening.
The gas circuit of a common pneumatic actuating component is shown in fig. 2, three-off position protection and power-off position protection functions are realized, the solenoid valve 01 is required to be equipped, a locking valve 02 (position protection valve) is required to be arranged at the off-gas position protection, and a protection terminal box 03 is required to be arranged at the off-signal position protection.
The existing gas circuit for the pneumatic actuating component realizes gas loss and position protection through a lock valve (position protection valve), but has great influence on the flow capacity of the gas circuit, particularly the flow capacity of the position protection valve seriously influences the full stroke time when the normal working condition requires quick action. How to rapidly realize air loss and position protection is a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
The object of the present invention is to provide a pneumatic circuit for a pneumatic actuator that solves at least the technical problems mentioned in the background.
The technical scheme adopted by the invention for solving the technical problems is as follows: a gas circuit for a pneumatic actuator comprises a gas inlet unit, a positioning unit, a valve unit and a pneumatic actuator which are connected in series on a gas source connecting pipeline; the air inlet unit is connected with an air source; the valve unit comprises two pneumatic control valves for respectively supplying air to and from the valve unit; the positioning unit is used for realizing the adjustment of the valve unit and comprises a power-off position-keeping module and a gas-off position-keeping module; the power-off position-keeping module can control the two air control valves to act to cut off compressed air to play a position-keeping role when a power supply fails or is powered off; one end of the power-off position-keeping module is connected with the air source, and the other end of the power-off position-keeping module is respectively connected with two air control valves; the air-break and position-keeping module can cut off the compressed air of the air source by emptying the compressed air and controlling the two air control valves to act when the air source fails or is cut off, thereby playing a position-keeping role; one end of the air-break and position-protection module is connected with the air-break and position-protection module, the other end of the air-break and position-protection module is connected between the air inlet unit and the valve unit, and the third end of the air-break and position-protection module is connected with an air source.
The invention is further provided with: the positioning unit also comprises a signal-breaking bit-retaining module; the signal interruption position-keeping module can cut off compressed air after a signal is interrupted, so that a position-keeping effect is achieved; one end of the signal interruption position protection module is connected with the air inlet unit, and the other two ends of the signal interruption position protection module are respectively connected with two air control valves.
The invention is further provided with: the signal interruption position-keeping module comprises an electric positioner; the electric positioner can cut off compressed air in an air source to play a role in position protection; the electrical positioner effects adjustment of the valve by increasing or decreasing the current signal; the power-off position-keeping module comprises an electromagnetic valve; when the power supply fails or the electromagnetic valve is powered off, compressed air at the electromagnetic valve is exhausted through the electromagnetic valve, the pneumatic control valve is controlled to act quickly, and the compressed air in the air source is cut off quickly to play a role in position retention; the air-break position-keeping module comprises an air control reversing valve; when the air source is in failure or is cut off, the pneumatic control reversing valve acts, compressed air at the pneumatic control reversing valve is emptied, the pneumatic control valve is controlled to act quickly, and the compressed air in the air source is cut off quickly to play a role in position retention; one end of the pneumatic control reversing valve is connected with the electromagnetic valve, the other end of the pneumatic control reversing valve is connected between the electric positioner and the air inlet unit, and the third end of the pneumatic control reversing valve is connected with an air source.
The invention is further provided with: the input signal of the electrical locator is 4-20 mA.
The invention is further provided with: the valve unit can also comprise two speed regulating valves which are respectively arranged on the connecting pipelines for gas inlet and gas outlet, wherein the two ends of one speed regulating valve are respectively connected with the pneumatic control valve and the pneumatic actuating mechanism, and the two ends of the other speed regulating valve are respectively connected with the pneumatic control valve and the pneumatic actuating mechanism.
The invention is further provided with: the opening and closing actions of the pneumatic actuating mechanism are driven and executed by an air source.
The invention is further provided with: the air source connecting pipeline is made of 304 stainless steel.
The invention is further provided with: the air inlet unit comprises a pressure reduction module, a filtering module and an oil mist module, wherein the pressure reduction module is used for stabilizing the pressure of gas provided by a gas source, the filtering module is used for filtering the gas, and the oil mist module is used for atomizing lubricating oil.
The invention is further provided with: the air source is an air cylinder, the air control valves with the air source pressure of 0.4MPa are all 2-position 2-ventilation control valves; the air inlet unit is an air source triple piece.
The invention has the beneficial effects that: therefore, the air circuit used for the pneumatic actuating mechanism and with the position keeping function can be provided when the power is off and the air is off through the power-off position keeping module and the air-off position keeping module of the positioning unit. Furthermore, the air path for the pneumatic actuating mechanism with the position-keeping function can be provided by the signal-off position-keeping module of the positioning unit when the signal is off. In addition, the pneumatic control reversing valve and the two 2-position 2-ventilation control valves are used for replacing a locking valve (a position-keeping valve) to realize quick action of the valve, so that the circulation capacity is ensured.
Drawings
Fig. 1 is a schematic diagram schematically illustrating the main elements and relative positional relationship of the present invention.
Fig. 2 is a schematic diagram schematically illustrating the main elements and relative positions of the air passages of a conventional pneumatic actuator.
Detailed Description
In the following description, similar elements are denoted by the same reference numerals, and directional terms are only used to schematically illustrate relative positional relationships between the elements, and thus the technical scope of the present invention is not limited thereto.
As shown in fig. 1, the gas circuit for a pneumatic actuator of the present invention includes an air inlet unit 1, a positioning unit, a valve unit and a pneumatic actuator 9 connected in series to an air source connecting line. The air source connecting pipeline is made of 304 stainless steel.
The air inlet unit 1 is connected with an air source and comprises a pressure reduction module, a filtering module and an oil mist module which are connected in series. The pressure reduction module is used for stabilizing the pressure of gas provided by a gas source, the filter module is used for filtering moisture or impurities in the gas, and the oil mist module is used for atomizing lubricating oil so as to be beneficial to lubricating moving parts of a machine body. The structures of the pressure reducing module, the filtering module and the oil mist module are not the key point of the improvement of the invention, and the pressure reducing valve, the filter and the oil mist device in the prior art can be used, so that the details are not repeated. In the embodiment, the air inlet unit 1 is an air supply triple piece of SMC, the model is AC25-N02G-A, and the air supply interface is NPT 1/4. The air source is an air cylinder, and the pressure of the air source is 0.4 MPa.
The valve unit comprises two pneumatic control valves 5 and 6 for respectively supplying air to and from the valve unit. In this embodiment, the pneumatic control valves 5 and 6 are 2-position 2-vent pneumatic control valves, SMC is selected, the model is VNA101-8A, and the air source interface is 1/4.
In specific implementation, in order to adjust the on-off time of the pneumatic actuator, the valve unit may further include two speed regulating valves 7 and 8 respectively disposed on the gas inlet and outlet connecting lines. Wherein, the two ends of the speed regulating valve 7 are respectively connected with the pneumatic control valve 6 and the pneumatic actuating mechanism 9; the two ends of the speed regulating valve 8 are respectively connected with the pneumatic control valve 5 and the pneumatic actuating mechanism 9. In the present embodiment, the speed control valves 7 and 8 are both made of SMC, model AS2000-02, and the air source interface 1/4 is provided.
The opening and closing actions of the pneumatic actuator 9 are driven and executed by an air source, namely, double functions are realized. The pneumatic actuator 9 in this embodiment is a double-acting pneumatic actuator of the fork type of san hans.
The positioning unit is used for adjusting the valve unit and comprises a signal-off position-keeping module, a power-off position-keeping module and a gas-off position-keeping module.
The signal-off hold module includes an electrical locator 4. After the signal is failed or is broken, the compressed air in the air cylinder can be cut off at the position of the electric positioner 4, and the position keeping effect is achieved. In specific implementation, the input signal of the electric positioner 4 is 4-20mA, and the adjustment of the valve is realized by increasing or decreasing the current signal. Wherein, one end of the electric positioner 4 is connected with the air inlet unit 1, and the other two ends are respectively connected with the pneumatic control valves 5 and 6.
In the embodiment, the electric positioner 4 adopts ABB with the model number of V18345-2020561101, the M20 multiplied by 1.5 is an electric interface, the G1/4 is an air source interface, the feedback is carried out by 4-20mA, the three-section position-keeping function is carried out, and the feedback of a proximity switch is arranged inside.
The power-off and position-keeping module comprises a solenoid valve 3. When the power supply fails or the electromagnetic valve 3 is powered off, the compressed air at the electromagnetic valve 3 is exhausted through the electromagnetic valve 3, the pneumatic control valves 5 and 6 are controlled to act quickly, the compressed air in the air cylinder is cut off quickly, and the position keeping effect is achieved. Wherein, one end of the electromagnetic valve 3 is connected with the air-break position-keeping module, and the other end is respectively connected with the air control valves 5 and 6.
In the present embodiment, the solenoid valve 3 is ASCO, model number SCG551A001MS, wherein the gas source is NPT1/4, and the power source is DC 24V.
The air-break position-keeping module comprises an air control reversing valve 2. When the air source is in failure or is cut off, the pneumatic control reversing valve 2 acts, compressed air at the pneumatic control reversing valve 2 is exhausted, the pneumatic control valves 5 and 6 are controlled to act quickly, the compressed air in the air cylinder is cut off quickly, and the position keeping effect is achieved. One end of the pneumatic control reversing valve 2 is connected with the electromagnetic valve 3, the other end of the pneumatic control reversing valve is connected between the electric positioner 4 and the air inlet unit 1, and the third end of the pneumatic control reversing valve is connected with an air source.
In the embodiment, the pneumatic control reversing valve 2 is Rotork with model YT-520S, wherein the air source interface is NPT1/4, and the input signal is 0.14-0.7 MPa.
The air path control principle for the pneumatic actuator as a whole will be explained below.
When the electromagnetic valve 3 is powered, the air source enters the pneumatic actuator through the air inlet unit 1 to the electric positioner 4 and through one of the air control valves and one of the speed regulating valves, and the air from the pneumatic actuator passes through the other one of the speed regulating valves and the other one of the air control valves to the electric positioner 4. Meanwhile, part of the gas in the two pneumatic control valves is connected with the gas source and the gas inlet unit 1 through the electromagnetic valve 3 and the pneumatic control reversing valve 2.
Because the pneumatic control reversing valve 2 and the two 2-position 2 air- breathing control valves 5 and 6 are used for replacing the original locking valve (position-keeping valve), compared with the common position-keeping valve which is generally required to be arranged at the inlet and outlet positions of the cylinder, the pneumatic control reversing valve can be farther away from the cylinder and closer to a main air source, the reaction time of air-losing action is quicker, and the pneumatic control reversing valve is safer and more favorable for occasions requiring quick reaction of accident working conditions. In addition, compared with a position-keeping valve with the same specification, the 2-position 2 air-vent control valve has the advantages that the effective sectional area is larger, the through-flow capacity is better, the drift diameter of the 2-position 2 air-vent control valve can be larger than that of the position-keeping valve, and therefore under the condition that the position is kept in the same mode, the through-flow capacity of the air path is better.
Moreover, because the positioner with power-off, signal-off and gas-off position protection functions is used for replacing the traditional positioner and protecting the terminal box, the signal-off position protection function can be realized under the condition of reducing accessories; the function of air-break and position-keeping is newly added, and the redundant air-break and position-keeping is formed with the two 2-position two-way air control valves, so that the safety is higher; and the redundant power-off position protection is formed with the power-off protection function of the existing electromagnetic valve, so that the electromagnetic valve is safer.
Therefore, the air path for the pneumatic actuating mechanism with the position keeping function can be provided by the power-off position keeping module and the air-off position keeping module of the positioning unit when power is off and air is off. Furthermore, the signal-off position-keeping module of the positioning unit can provide a gas path for a pneumatic actuating mechanism with a position-keeping function when the signal is off, so that the aim of the invention can be really achieved.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the technical scope of the present invention is not limited thereby, but the simple equivalent changes made in the claims and the specification of the present invention are within the scope of the present invention.
Claims (9)
1. An air passage for a pneumatic actuator; the method is characterized in that: the pneumatic control system comprises an air inlet unit, a positioning unit, a valve unit and a pneumatic actuating mechanism which are connected in series on an air source connecting pipeline;
the air inlet unit is connected with an air source;
the valve unit comprises two pneumatic control valves for respectively supplying air to and from the valve unit;
the positioning unit is used for realizing the adjustment of the valve unit and comprises a power-off position-keeping module and a gas-off position-keeping module;
the power-off position-keeping module can control the two air control valves to act to cut off compressed air to play a position-keeping role when a power supply fails or is powered off; one end of the power-off position-keeping module is connected with the air source, and the other end of the power-off position-keeping module is respectively connected with two air control valves;
the air-break and position-keeping module can cut off the compressed air of the air source by emptying the compressed air and controlling the two air control valves to act when the air source fails or is cut off, thereby playing a position-keeping role; one end of the air-break and position-protection module is connected with the air-break and position-protection module, the other end of the air-break and position-protection module is connected between the air inlet unit and the valve unit, and the third end of the air-break and position-protection module is connected with an air source.
2. The pneumatic circuit for a pneumatic actuator of claim 1, wherein: the positioning unit also comprises a signal-breaking bit-retaining module; the signal interruption position-keeping module can cut off compressed air after a signal is interrupted, so that a position-keeping effect is achieved; one end of the signal interruption position protection module is connected with the air inlet unit, and the other two ends of the signal interruption position protection module are respectively connected with two air control valves.
3. The pneumatic circuit for a pneumatic actuator of claim 2, wherein: the signal interruption position-keeping module comprises an electric positioner; the electric positioner can cut off compressed air in an air source to play a role in position protection; the electrical positioner effects adjustment of the valve by increasing or decreasing the current signal; the power-off position-keeping module comprises an electromagnetic valve; when the power supply fails or the electromagnetic valve is powered off, compressed air at the electromagnetic valve is exhausted through the electromagnetic valve, the pneumatic control valve is controlled to act quickly, and the compressed air in the air source is cut off quickly to play a role in position retention; the air-break position-keeping module comprises an air control reversing valve; when the air source is in failure or is cut off, the pneumatic control reversing valve acts, compressed air at the pneumatic control reversing valve is emptied, the pneumatic control valve is controlled to act quickly, and the compressed air in the air source is cut off quickly to play a role in position retention; one end of the pneumatic control reversing valve is connected with the electromagnetic valve, the other end of the pneumatic control reversing valve is connected between the electric positioner and the air inlet unit, and the third end of the pneumatic control reversing valve is connected with an air source.
4. The pneumatic circuit for a pneumatic actuator of claim 3, wherein: the input signal of the electrical locator is 4-20 mA.
5. The pneumatic circuit for a pneumatic actuator of claim 1, wherein: the valve unit can also comprise two speed regulating valves which are respectively arranged on the connecting pipelines for gas inlet and gas outlet, wherein the two ends of one speed regulating valve are respectively connected with the pneumatic control valve and the pneumatic actuating mechanism, and the two ends of the other speed regulating valve are respectively connected with the pneumatic control valve and the pneumatic actuating mechanism.
6. The pneumatic circuit for a pneumatic actuator of claim 1, wherein: the opening and closing actions of the pneumatic actuating mechanism are driven and executed by an air source.
7. The pneumatic circuit for a pneumatic actuator according to any one of claims 1 to 6, wherein: the air source connecting pipeline is made of 304 stainless steel.
8. The pneumatic circuit for a pneumatic actuator according to any one of claims 1 to 6, wherein: the air inlet unit comprises a pressure reduction module, a filtering module and an oil mist module, wherein the pressure reduction module is used for stabilizing the pressure of gas provided by a gas source, the filtering module is used for filtering the gas, and the oil mist module is used for atomizing lubricating oil.
9. The pneumatic circuit for a pneumatic actuator according to any one of claims 1 to 6, wherein: the air source is an air cylinder, and the pressure of the air source is 0.4 MPa; the pneumatic control valves are all 2-position 2-ventilation control valves; the air inlet unit is an air source triple piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010856526.5A CN112066075A (en) | 2020-08-24 | 2020-08-24 | Air circuit for pneumatic actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010856526.5A CN112066075A (en) | 2020-08-24 | 2020-08-24 | Air circuit for pneumatic actuator |
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| Publication Number | Publication Date |
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| CN112066075A true CN112066075A (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010856526.5A Pending CN112066075A (en) | 2020-08-24 | 2020-08-24 | Air circuit for pneumatic actuator |
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| CN (1) | CN112066075A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117469414A (en) * | 2023-12-27 | 2024-01-30 | 四川九天真空科技有限公司 | Side drive gate valve and driving system |
-
2020
- 2020-08-24 CN CN202010856526.5A patent/CN112066075A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117469414A (en) * | 2023-12-27 | 2024-01-30 | 四川九天真空科技有限公司 | Side drive gate valve and driving system |
| CN117469414B (en) * | 2023-12-27 | 2024-04-30 | 四川九天真空科技有限公司 | Side drive gate valve and driving system |
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