CN108916161B - Pneumatic control system and control method - Google Patents
Pneumatic control system and control method Download PDFInfo
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- CN108916161B CN108916161B CN201810971900.9A CN201810971900A CN108916161B CN 108916161 B CN108916161 B CN 108916161B CN 201810971900 A CN201810971900 A CN 201810971900A CN 108916161 B CN108916161 B CN 108916161B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
Abstract
The invention discloses a pneumatic control system and a control method, wherein the pneumatic control system comprises a pedal valve, a first double-pressure valve, a second double-pressure valve, a first two-position five-way valve, a second two-position five-way valve, a shuttle valve and a cylinder; the external air source is connected with the P port of the foot valve and the P port of the second two-position five-way valve, and the A port and the B port of the foot valve are respectively connected with the P port of the first two-position five-way valve and the control port of one end of the first two-position five-way valve; the air inlet at one end of the first double-pressure valve and the air inlet at one end of the second double-pressure valve are both connected with the A port of the first two-position five-way valve; the air outlet of the first double-pressure valve is connected with the control port at one end of the second two-position five-way valve and one air inlet of the shuttle valve, and the air outlet of the second double-pressure valve is connected with the control port at the other end of the second two-position five-way valve and the other air inlet of the shuttle valve; the air outlet of the shuttle valve is connected with the control port at the other end of the first two-position five-way valve; the A port of the second two-position five-way valve and the air inlet at the other end of the second double-pressure valve are both connected with the air cylinder. The invention can be adapted to Jiang Cihuan environments and inflammable and explosive environments.
Description
Technical Field
The invention relates to the technical field of pneumatic control, in particular to a pneumatic control system and a pneumatic control method.
Background
In flammable and explosive or strong magnetic working environments, such as underground coal mine, a control system for use cannot generally adopt electric control and is easy to explode; or in large workshops where strong magnetism exists, electric control cannot be generally adopted, and the strong magnetic environment easily causes failure of electric control. Meanwhile, if flammable and explosive gas exists in the working environment, such as in a mine, the electric device cannot avoid the possibility of generating electric sparks, so that hidden danger is brought to safe production.
Disclosure of Invention
The invention aims to provide a pneumatic control system and a pneumatic control method, which can be suitable for Jiang Cihuan environments and inflammable and explosive environments.
To achieve the purpose, the invention adopts the following technical scheme:
the pneumatic control system comprises a pedal valve, a first two-position five-way valve, a first double-pressure valve, a second two-position five-way valve, a shuttle valve and a cylinder;
the external air source is connected with the P port of the foot valve and the P port of the second two-position five-way valve, and the A port and the B port of the foot valve are respectively connected with the P port of the first two-position five-way valve and a control port at one end of the P port;
the air inlet at one end of the first double-pressure valve and the air inlet at one end of the second double-pressure valve are both connected with the A port of the first two-position five-way valve;
the air outlet of the first double-pressure valve is connected with the control port at one end of the second two-position five-way valve and one air inlet of the shuttle valve, and the air outlet of the second double-pressure valve is connected with the control port at the other end of the second two-position five-way valve and the other air inlet of the shuttle valve;
the air outlet of the shuttle valve is connected with the control port at the other end of the first two-position five-way valve;
and an A port of the second two-position five-way valve and an air inlet at the other end of the second double-pressure valve are both connected with the air cylinder.
Preferably, the oil mist separator is further included, and the oil mist separator is connected to the P port of the foot valve and the P port of the second two-position five-way valve.
Preferably, an exhaust throttle valve is connected to the R port and/or the S port of the first two-position five-way valve; and/or
And an R port and/or an S port of the second two-position five-way valve are/is connected with an exhaust throttle valve.
Preferably, the positions of the first double pressure valve and the second double pressure valve are symmetrically arranged relative to the second two-position five-way valve.
The invention also provides a control method of the pneumatic control system, which comprises the following steps:
the second two-position five-way valve acts to control the on-off of an external air source and the air cylinder;
the first two-position five-way valve is controlled to act through a pedal valve or a shuttle valve;
the pedal valve, the first two-position five-way valve and the second two-position five-way valve control the air outlets of the first double-pressure valve and the second double-pressure valve to be opened or closed, and the first double-pressure valve and the second double-pressure valve control the second two-position five-way valve to act and simultaneously control the air outlets of the shuttle valve to be opened or closed.
Preferably, the second two-position five-way valve action for controlling the on-off of the external air source and the air cylinder comprises:
when the port P and the port B of the second two-position five-way valve are communicated, the cylinder keeps the former action state; and the port P of the second two-position five-way valve is communicated with the port A, so that the cylinder acts.
Preferably, when the external air source is out of air, the first double-pressure valve, the second double-pressure valve, the first two-position five-way valve, the second two-position five-way valve, the shuttle valve and the foot valve all keep the current state unchanged.
Preferably, controlling the first two-position five-way valve action by a foot valve or a shuttle valve comprises:
if the pedal valve P port is communicated with the A port, the P port of the first two-position five-way valve is communicated with the A port, the first two-position five-way valve is controlled to act through the shuttle valve, and the second two-position five-way valve is controlled to act through the first double-pressure valve or the second double-pressure valve;
if the pedal valve P port is communicated with the port B, the first two-position five-way valve P port is communicated with the port B, and then the pedal valve controls the action of the first two-position five-way valve.
Preferably, if the pedal valve P port is communicated with the a port, the P port of the first two-position five-way valve is communicated with the a port, and the controlling the first two-position five-way valve through the shuttle valve comprises:
if the current state of the second two-position five-way valve is that the P port is communicated with the A port, the second dual-pressure valve controls the air outlet of the shuttle valve to be air, and the shuttle valve controls the first two-position five-way valve to act;
if the current state of the second two-position five-way valve is that the P port is communicated with the B port, the first double-pressure valve controls the air outlet of the shuttle valve to be air, and the shuttle valve controls the first two-position five-way valve to act.
Preferably, if the pedal valve P port is communicated with the a port, the P port of the first two-position five-way valve is communicated with the a port, and the controlling the valve core action of the second two-position five-way valve through the first dual-pressure valve or the second dual-pressure valve comprises:
if the current state of the first two-position five-way valve is that the P port is communicated with the A port, the second two-position five-way valve is controlled to act through the second double-pressure valve;
if the current P state of the first two-position five-way valve is that the port is communicated with the port A, the second two-position five-way valve is controlled to act through the first double-pressure valve.
The invention has the beneficial effects that: the pneumatic control system is applied to flammable and explosive environments or strong electromagnetic environments, the control mode is stable, explosion of the working environment caused by electric sparks is avoided, the safety of the working environment in a workshop is ensured, or the control system has the problem of failure of electrical appliance control in the strong electromagnetic environments, and the pneumatic control system does not cause the continuous driving phenomenon of the air cylinder.
Drawings
FIG. 1 is a schematic diagram of the operation of the pneumatic control system of the present invention;
FIG. 2 is a top view of the material handling apparatus of the present invention;
FIG. 3 is a side view of the material handling apparatus of the present invention;
FIG. 4 is a schematic diagram of the operation of the pneumatic control system of the present invention in an initial state;
FIG. 5 is a schematic diagram of the operation of the pneumatic control system of the present invention when the foot valve is depressed or depressed;
FIG. 6 is a schematic diagram of the operation of the pneumatic control system of the present invention when the foot valve is continuously depressed;
FIG. 7 is a schematic diagram of the operation of the pneumatic control system of the present invention with the foot valve released or lifted;
FIG. 8 is a schematic diagram of the operation of the foot valve of the pneumatic control system of the present invention when operated in a sustained release or lift mode;
FIG. 9 is a schematic diagram of the operation of the pneumatic control system of the present invention when the foot valve is again depressed or depressed;
FIG. 10 is a schematic diagram of the operation of the pneumatic control system of the present invention when the foot valve is again continuously depressed or depressed;
FIG. 11 is a schematic diagram of the operation of the pneumatic control system of the present invention with the foot valve again released or lifted;
fig. 12 is a schematic diagram of the operation of the pneumatic control system of the present invention when the foot valve is again continuously released or lifted.
In the figure:
1. a foot valve; 2. a first two-position five-way valve; 3. a first double pressure valve; 4. a second double pressure valve; 5. a second two-position five-way valve; 6. a shuttle valve; 7. a cylinder, 8, an oil mist separator; 9. an exhaust throttle valve; 10. a main air pipe; 101. a first branch air pipe; 102. a second bronchus; 11. a roller conveyor line; 111. a roller; 12. a frame.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, the present embodiment provides a pneumatic control system, which includes a foot valve 1, a first two-position five-way valve 2, a first dual-pressure valve 3, a second dual-pressure valve 4, a second two-position five-way valve 5, a shuttle valve 6, and a cylinder 7, wherein the cylinder 7 is a stop cylinder, the air pressure of an external air source is 0.4-0.6Mpa, the first two-position five-way valve 2 and the second two-position five-way valve 5 are pneumatic control valves, and the foot valve 1 is a two-position five-way foot valve. The double-gas control valve has a memory function, and can keep unchanged at the current position after gas interruption. The two double pressure valves are equivalent to logic control AND, and only the two air inlets have air outlets at the same time. The shuttle valve 6 corresponds to a logical or, and the outlet vents as long as either of the two inlets is vented.
In fig. 1, the shuttle valve 6, the first double pressure valve 3 and the second double pressure valve 4 have air inlets and air outlets, the mark 0 indicates no air, the mark 1 indicates air, the line indicates air pipe, the air pipe and the air pipe are selectively connected by a joint, and the cross line without the joint is not connected.
In addition, the pneumatic control system further comprises an oil mist separator 8, wherein gas passes through the oil mist separator 8, is connected with a quick-change connector through an outlet of the oil mist separator 8 and a main gas pipe 10, and is connected with a P port of the foot valve 1 and a P port of the second two-position five-way valve 5 through a first branch gas pipe 101 and a second branch gas pipe 102 after passing through the quick-change connector;
the A port and the B port of the foot valve 1 are respectively connected with the P port and the left end control port of the first two-position five-way valve 2;
the right end control port of the first two-position five-way valve 2 is connected with the air outlet of the shuttle valve 6, and the B port of the first two-position five-way valve 2 is blocked by a plug;
the left end air inlet of the first double-pressure valve 3 and the right end air inlet of the second double-pressure valve 4 are both connected with an A port of the first two-position five-way valve 2, the right end air inlet of the first double-pressure valve 3 is connected with a B port of the second two-position five-way valve 5, and the left end air inlet of the second double-pressure valve 4 and the A port of the second two-position five-way valve 5 are both connected with a rod cavity of the cylinder 7;
the air outlet of the first double-pressure valve 3 is simultaneously connected with the left end control port of the second two-position five-way valve 5 and the left end air inlet of the shuttle valve 6; the air outlet of the second double-pressure valve 4 is simultaneously connected with the right end control port of the second two-position five-way valve 5 and the right end air inlet of the shuttle valve 6, and a one-way throttle valve is arranged on a branch connected with the first double-pressure valve 3 and the second two-position five-way valve 5 and on a branch connected with the second double-pressure valve 4 and the second two-position five-way valve 5, and the valve core action of the second two-position five-way valve 5 is controlled through the first double-pressure valve 3 and the second double-pressure valve 4;
further, in the present embodiment, the exhaust throttle valve 9 with a muffler is connected to both the R port and S port of the first two-position five-way valve 2 and the second two-position five-way valve 5. The exhaust throttle valve 9 may be attached to the port R and the port S of one of the first two-position five-way valve 2 and the second two-position five-way valve 5, or may be not attached to the other. When the first double-pressure valve 3 and the second double-pressure valve 4 are not symmetrically installed, the exhaust throttle valve 9 can be used for ensuring that the gas is not interrupted before the first two-position five-way valve 2 and the second two-position five-way valve 5 finish the action, and the opening of the throttle valve is regulated for ensuring that the actions of the first two-position five-way valve 2 and the second two-position five-way valve 5 are synchronous; secondly, the silencing effect can be achieved, and noise generated when the first two-position five-way valve 2 and the second two-position five-way valve 5 exhaust is reduced, especially when different types of control valves are more; and thirdly, fine particles such as dust in the environment can be prevented from entering the first two-position five-way valve 2 and the second two-position five-way valve 5, so that the movement of the valve core is possibly blocked, and the service lives of the two valves are reduced.
When the exhaust throttle valve 9 is not installed, the first double pressure valve 3 and the second double pressure valve 4 are installed to be completely symmetrical about the first two-position five-way valve 2, so that the air intake synchronism of the two ends of the first two-position five-way valve 2 is ensured, wherein after air interruption, the first two-position five-way valve 2 and the second two-position five-way valve 5 are both in a horizontal state.
The embodiment also provides a material conveying device, which comprises the pneumatic control system, specifically, as shown in fig. 2 and 3, the material conveying device comprises a roller conveying line 11 and a rack 12, the roller conveying line 11 is arranged on the rack 12, the roller conveying line 11 comprises two groups of rollers 111 which are arranged in parallel on the same horizontal plane at preset intervals, the air cylinder 7 is arranged between the two groups of rollers 111, and whether the air cylinder 7 jacks up materials conveyed on the rollers 111 or not is controlled by stretching or retracting the air cylinder 7.
The embodiment also provides a control method for the pneumatic control system, which comprises the steps that the second two-position five-way valve 5 acts to control the on-off of an external air source and the air cylinder 7; the first two-position five-way valve 2 is controlled to act through the pedal valve 1 or the shuttle valve 6; the pedal valve 1, the first two-position five-way valve 2 and the second two-position five-way valve 5 are used for controlling whether the air outlets of the first double-pressure valve 3 and the second double-pressure valve 4 are air or not, the first double-pressure valve 3 and the second double-pressure valve 4 are used for controlling the second two-position five-way valve 5 to act, and meanwhile, whether the air outlets of the shuttle valve 6 are air or not is controlled.
The second two-position five-way valve 5 acts to control the on-off of an external air source and the air cylinder 7 and comprises the following steps: when the port P and the port B of the second two-position five-way valve 5 are communicated, the cylinder 7 keeps the former action state; and the port P of the second two-position five-way valve 5 is communicated with the port A, so that the cylinder 7 acts. When the external air source is disconnected, the current states of the first double-pressure valve 3, the second double-pressure valve 4, the first two-position five-way valve 2, the second two-position five-way valve 5, the shuttle valve 6 and the foot valve 1 are all kept unchanged.
Specifically, the control of the first two-position five-way valve 2 through the foot valve 1 or the shuttle valve 6 includes: if the pedal valve 1P is communicated with the A port, the P port of the first two-position five-way valve 2 is communicated with the A port, the shuttle valve 6 controls the first two-position five-way valve 2 to act, and the first double-pressure valve 3 or the second double-pressure valve 4 controls the second two-position five-way valve 5 to act; if the port P of the foot valve 1 is communicated with the port B, the port P of the first two-position five-way valve 2 is communicated with the port B, and then the action of the first two-position five-way valve 2 is controlled by the foot valve 1.
More specifically, if the port P of the foot valve 1 is communicated with the port a, the port P of the first two-position five-way valve 2 is communicated with the port a, and the controlling the first two-position five-way valve 2 through the shuttle valve 6 includes: if the current state of the second two-position five-way valve 5 is that the port P is communicated with the port A, the second double-pressure valve 4 controls the air outlet of the shuttle valve 6 to be air, and the shuttle valve 6 controls the first two-position five-way valve 2 to act; if the current state of the second two-position five-way valve 5 is that the port P is communicated with the port B, the first double-pressure valve 3 controls the air outlet of the shuttle valve 6 to be air, and the shuttle valve 6 controls the first two-position five-way valve 2 to act.
More specifically, if the port P of the foot valve 1 is communicated with the port a, the port P of the first two-position five-way valve 5 is communicated with the port a, and the valve element action of the second two-position five-way valve 5 controlled by the first dual-pressure valve 3 or the second dual-pressure valve 4 comprises:
if the current state of the first two-position five-way valve 2 is that the port P is communicated with the port A, the second two-position five-way valve 5 is controlled to act through the second double-pressure valve 4; if the current P state of the first two-position five-way valve 2 is that the port is communicated with the port A, the second two-position five-way valve 5 is controlled to act through the first double pressure valve 3.
Specifically, as shown in fig. 4 to 12, the pneumatic control system in the present embodiment shows nine different working states for different initial states and actions of the foot valve 1.
The action of the foot valve 1 is divided into an initial free state, the foot valve 1 is continuously pressed or stepped down, the foot valve 1 is stepped down to a state of being kept motionless, the human foot lifts the foot valve 1 and the process is repeatedly operated, the air cylinder 7 is operated once by stepping the foot valve 1 once, and the pneumatic control system is restored to the initial state by stepping the foot valve 1 twice.
(1) As shown in fig. 4, at this time, the foot valve 1 is not operated, the port P of the second two-position five-way valve 5 is communicated with the port a thereof, and is communicated with the rod cavity of the cylinder 7, and at the same time, the gas in the second branch pipe 102 is communicated with the port P of the second two-position five-way valve 5, so that the cylinder 7 is in a compressed state at this time, and the state of the cylinder 7 at this time is taken as an initial state in this embodiment.
Meanwhile, in the current state, no gas exists in the first double pressure valve 3 and the shuttle valve 6. Since the gas passes through the oil mist separator 8, the main gas pipe 10 and the second branch gas pipe 102 and is connected to the left inlet of the second double pressure valve 4, the second double pressure valve 4 is connected to the left inlet to be aerated, as indicated by the "1" state in fig. 4.
The valve core of the foot valve 1 is in a right state, and the valve cores of the first two-position five-way valve 2 and the second two-position five-way valve 5 are in a left state. At this time, the port P of the foot valve 1 is communicated with the port B of the foot valve 1, the port A of the foot valve 1 is communicated with the port R, the port B of the foot valve 1 is communicated with the left end control port of the first two-position five-way valve 2, and the port A of the foot valve 1 is communicated with the port P of the first two-position five-way valve 2.
(2) As shown in fig. 5, when the foot valve 1 is depressed or operated by stepping, the spool of the foot valve 1 moves rightward, and the spool is left, and at this time, the second two-position five-way valve 5 in step (1) is in the same state, and therefore the cylinder 7 is still in the retracted state, and at this time, the external air source requires a reaction time in the air pipe, which results in hysteresis of the operation of each valve, and at this time, each valve does not operate. Thus, the gas from the external source through the second branch 102 is still able to provide a source of gas for the rodless chamber of the cylinder 7, keeping the cylinder 7 in the retracted state.
The state of the foot valve 1 is: the pedal valve 1 has a P port communicated with the A port of the pedal valve 1, a S port communicated with the B port of the pedal valve 1, and is communicated with the P port of the first two-position five-way valve 2 through the A port of the pedal valve 1, and is communicated with the left end control port of the first two-position five-way valve 2 through the B port of the pedal valve 1; the other individual valves remain unchanged in the current state.
Since the first double pressure valve 3, the second double pressure valve 4 and the shuttle valve 6 are not in place at the instant of the stepping of the foot valve 1, the first two-position five-way valve 2 and the second two-position five-way valve 5 are temporarily not operated.
(3) As shown in fig. 6, when the foot valve 1 continues to be depressed, the cylinder 7 acts at a certain time in the continuous depression process, the cylinder 7 is reset under the action of its own spring, and the valve core of the foot valve 1 is changed from the retracted state to the extended state, so that the position in the step 2 is kept unchanged.
Specifically, the P port of the foot valve 1 communicates with the a port thereof, and the S port communicates with the B port thereof, due to the valve body operation of the foot valve 1 in the step 2.
When the foot valve 1 is continuously depressed, the gas reacts for a period of time, and the gas in the first double pressure valve 3, the second double pressure valve 4, and the shuttle valve 6 is in place. As shown in fig. 5, after the gas passing through the oil mist separator 8 passes through the main gas pipe 10, the first branch gas pipe 101, the P port and the a port of the foot valve 1, and the P port and the a port of the first two-position five-way valve 2, the right end gas inlet of the second double pressure valve 4 and the left end gas inlet of the first double pressure valve 3 are in a gas state, namely a labeled "1" state in the figure; meanwhile, in the initial state, the second dual-pressure valve 4 is connected with the left air inlet to form a 1 state, and the air outlet of the second dual-pressure valve 4 is discharged by combining the above two factors, namely, the air outlet of the second dual-pressure valve 4 is in the 1 state in fig. 5.
In the process of continuously stepping down the foot valve 1, the gas of the second double pressure valve 4 is in place, and the gas of the gas outlet pushes the valve core of the second two-position five-way valve 5 to move left, namely the valve core is in a right position state, and the state is changed from the state in fig. 5 to the state in fig. 6.
In fig. 5, the right end air inlet of the shuttle valve 6 is connected to the air outlet of the second dual-pressure valve 4, so that the right end of the shuttle valve 6 is in the "1" state marked in fig. 5, the air outlet of the shuttle valve 6 is in the "1" state, and the shuttle valve 6 pushes the valve core of the first two-position five-way valve 2 to move left, i.e. the valve core is in the right state.
At this time, the state of the first double pressure valve 3 is that the right air inlet is aerated, namely, the state of '1' marked in fig. 5.
After the valve bodies of the first two-position five-way valve 2 and the second two-position five-way valve 5 are operated, the states of the two valves are shown in fig. 6.
At this time, as shown in fig. 6, the port P of the first two-position five-way valve 2 is connected to the port B, the port B is blocked by the plug, and the air source is communicated with the port P of the foot valve 1 via the first branch air pipe 101, so that the port P of the foot valve 1 is communicated with the port a, and the port a of the foot valve 1 is connected to the port P of the first two-position five-way valve 2.
The A port of the first two-position five-way valve 2 is connected with the R port of the first two-position five-way valve, and the R port and the S port of the first two-position five-way valve are connected with an exhaust throttle valve 9 with a muffler.
The port P of the second two-position five-way valve 5 is communicated with the port B of the second two-position five-way valve, the port A is communicated with the port R of the second two-position five-way valve, and the port R and the port S are connected with an exhaust throttle valve 9 with a muffler.
Because the second branch pipe 102 is communicated with the P port of the second two-position five-way valve 5 when the second branch pipe is positioned at the right position, the P port of the second two-position five-way valve 5 is communicated with the B port, and the B port of the second two-position five-way valve 5 is communicated with the right air inlet of the first double-pressure valve 3, at the moment, the right air inlet of the first double-pressure valve 3 is in a 1 state;
the left air inlet and the air outlet of the first double pressure valve 3 and all the air inlets and the air outlets of the second double pressure valve 4 are not air, and are in a 0 state.
The opening A of the second two-position five-way valve 5 is communicated with the rod cavity of the air cylinder 7, and the opening A of the second two-position five-way valve 5 is also communicated with the opening R of the second two-position five-way valve 5, so that the exhaust throttle valve 9 can exhaust the air in the air cylinder 7, and the air cylinder 7 acts to be in an extending state under the action of the elasticity of a spring.
(4) As shown in fig. 7, when the foot valve 1 is released or lifted, the spool of the foot valve 1 moves left, i.e., the spool is at the right position, at this time, the port R of the foot valve 1 communicates with the port a of the foot valve 1, the port P communicates with the port B of the foot valve 1, and the valves remain stationary due to the action hysteresis of the valves, and the cylinder 7 is connected to the port a of the second two-way five-position valve 5, which communicates with the port R, and the port R is connected to the exhaust throttle 9 with a muffler, so that the cylinder 7 remains in the 3 rd step and is in the extended state.
At this time, the states of the respective air inlets and air outlets of the first double pressure valve 3, the second double pressure valve 4 and the shuttle valve 6 remain the same as those in step 3.
(5) As shown in fig. 8, the cylinder 7 remains stationary during the sustained release or lifting of the foot valve 1 for the same reasons as in step 4, the course of action is as follows,
in the step 4, the valve core of the foot valve 1 is positioned at the right position, an external air source is communicated with the left end control port of the first two-position five-way valve 2 after passing through the P port and the B port of the foot valve 1, and meanwhile, the air inlet at the right end of the first two-position five-way valve 2 is communicated with the air outlet of the shuttle valve 6 in the step 4, so that the right end of the first two-position five-way valve 2 is airless. At this time, the valve core of the first two-position five-way valve 2 is subject to the action of the left end control port gas, and the valve core moves rightward, and at this time, the valve core is at the left position.
Since the states of the air inlets and the air outlets of the first double pressure valve 3 and the second double pressure valve 4 are still the same as in the step 4, the valve core of the first two-position five-way valve 2 does not act, and therefore, the air source still does not provide power for the air cylinder 7, and the air cylinder 7 still keeps in the extending state.
The state of the first double pressure valve 3 is the same as the state of the 3 rd step and the 4 th step, and the right end air inlet is in a 1 state.
(6) As shown in fig. 9, when the foot valve 1 is depressed or stepped on, the foot valve 1 operates, and the first two-position five-way valve 2 and the first two-position five-way valve 5 are not operated yet due to the reaction hysteresis of the respective valves, and the states of the first two-position five-way valve 2 and the second two-position five-way valve 5 are continued from the previous state of the previous state, and are not free states. The action process is as follows:
when the foot valve 1 is depressed again, the cylinder 7 remains in the extended state in steps 3-5, and the cylinder 7 does not operate for the same reason as in step 5 described above.
The valve core of the foot valve 1 moves rightwards, namely the valve core is in a left position state, at the moment, the P port of the foot valve 1 is communicated with the A port of the foot valve 1, and the S port is communicated with the B port of the foot valve.
(7) As shown in fig. 10, when the foot valve 1 is continuously depressed, the cylinder 7 is actuated, changing from the extended state to the retracted state, the course of the action is as follows,
the gas is delivered in place in the gas pipe at a certain time in the process of being continuously stepped down again due to the action of the step 6 foot valve 1, and at this time, the cylinder 7 is operated;
specifically, as shown in fig. 9, the gas filtered by the oil mist separator 8 passes through the main gas pipe 10, the first branch gas pipe 101, the P port and the a port of the foot valve 1, and then passes through the P port and the a port of the first two-position five-way valve 2 to supply gas to the left end gas inlet of the first double pressure valve 3 and the right end gas inlet of the second double pressure valve 4, and at this time, the two states are all in a "1" state, and in the above step 5, the right end gas inlet of the first double pressure valve 3 is in a "1" state, so the gas outlet of the first double pressure valve 3 is in a "1" state. Therefore, the spool of the second two-position five-way valve 5 moves rightward, that is, the spool is in the left position state, and at this time, the state of fig. 9 is changed to the state shown in fig. 10.
In fig. 9, the air outlet of the first double pressure valve 3 is communicated with the air inlet at the left end of the shuttle valve 6, so that both the air inlet at the left end of the shuttle valve 6 and the air outlet are in a 1 state. Therefore, the right control port of the first two-position five-way valve 2 is aerated, and the valve core of the second two-position five-way valve 5 moves leftwards, namely, the valve core is in a right position state, as shown in fig. 10.
As shown in fig. 10, the connection state of the second two-position five-way valve 5 and the first two-pressure valve 3, the second two-pressure valve 4 is the same as in step 1; the connection state of the first two-position five-way valve 2 and the foot valve 1 is the same as in the step 3.
The current state of the second double pressure valve 4 is that the left end control port is aerated and is in a '1' state.
(8) As shown in fig. 11, the foot valve 1 is lifted or released again, and the cylinder 7 is kept in a retracted state because the continuous external air source in the step 7 supplies power to the rod cavity of the cylinder 7, and at the same time, the first two-position five-way valve 2 and the second two-position five-way valve 5 are kept in a temporary state because of action hysteresis.
The foot valve 1 acts, the valve core moves leftwards, the valve core is in a right position state, at the moment, the connection relation between the foot valve 1 and the first two-position five-way valve 2 is the same as that in the step 4, and the connection relation between the second two-position five-way valve 5 and the first double-pressure valve 3 and the second double-pressure valve 4 is the same as that in the step 7.
(9) As shown in fig. 12, when the foot valve 1 is continuously lifted or released again, the cylinder 7 maintains the retracted state because the same operation as that in step 8 is performed, and the operation is as follows:
since the connection relationship between the second two-position five-way valve 5 and the first two-pressure valve 3 and the second two-pressure valve 4 is the same as that of the step 7, the second two-position five-way valve 5 does not operate, and the cylinder 7 does not operate in the step;
the connection relation between the foot valve 1 and the first two-position five-way valve 2 is the same as that in the step 4, so that the left end control port of the first foot valve 1 and the first two-position five-way valve 2, which is the same as that in the step 4, is in a '1' state, and therefore, the valve core of the second two-position five-way valve 5 moves right and is in a left state. The operation state of the control system in step 1 is returned.
The pneumatic control system described above is switched over in nine operating states, resulting in a good control of the cylinder 7. Through the pneumatic control system, the cylinder 7 can be ensured not to appear the continuous driving phenomenon when a person steps on the pedal valve 1 and does not move. By the control system, the cylinder 7 can be reset in the process of two stepping actions, and the pedal valve 1 is stepped according to the needs of staff, so that the position of the cylinder 7 is determined.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The pneumatic control system is characterized by comprising a foot valve (1), a first two-position five-way valve (2), a first double-pressure valve (3), a second double-pressure valve (4), a second two-position five-way valve (5), a shuttle valve (6) and a cylinder (7);
the external air source is connected with the P port of the foot valve (1) and the P port of the second two-position five-way valve (5), and the A port and the B port of the foot valve (1) are respectively connected with the P port of the first two-position five-way valve (2) and a control port at one end of the P port;
the air inlet at one end of the first double-pressure valve (3) and the air inlet at one end of the second double-pressure valve (4) are both connected with the A port of the first two-position five-way valve (2);
the air inlet at the other end of the first double-pressure valve (3) is connected with the port B of the second two-position five-way valve (5);
the air outlet of the first double-pressure valve (3) is connected with the control port at one end of the second two-position five-way valve (5) and one air inlet of the shuttle valve (6), and the air outlet of the second double-pressure valve (4) is connected with the control port at the other end of the second two-position five-way valve (5) and the other air inlet of the shuttle valve (6);
the air outlet of the shuttle valve (6) is connected with the control port at the other end of the first two-position five-way valve (2);
the port A of the second two-position five-way valve (5) and the air inlet at the other end of the second double-pressure valve (4) are both connected with the air cylinder (7).
2. A pneumatic control system as claimed in claim 1, further comprising an oil mist separator (8), said oil mist separator (8) being connected to the P port of said foot valve (1) and to the P port of said second two-position five-way valve (5).
3. Pneumatic control system according to claim 1, characterized in that the R-port and/or S-port of the first two-position five-way valve (2) is connected with an exhaust throttle valve (9); and/or
And an R port and/or an S port of the second two-position five-way valve (5) are/is connected with an exhaust throttle valve (9).
4. Pneumatic control system according to claim 1, characterized in that the positions of the first (3) and second (4) double pressure valves are symmetrically mounted with respect to the second two-position five-way valve (5).
5. A control method of a pneumatic control system for a pneumatic control system as claimed in any one of claims 1 to 4, comprising:
the second two-position five-way valve (5) acts to control the on-off of an external air source and the air cylinder (7);
the pedal valve (1) or the shuttle valve (6) is used for controlling the first two-position five-way valve (2) to act;
the pedal valve (1), the first two-position five-way valve (2) and the second two-position five-way valve (5) are used for controlling the air outlets of the first double-pressure valve (3) and the second double-pressure valve (4) to be opened or closed, the first double-pressure valve (3) and the second double-pressure valve (4) are used for controlling the second two-position five-way valve (5) to act, and meanwhile, the air outlet of the shuttle valve (6) is controlled to be opened or closed.
6. The control method according to claim 5, wherein the second two-position five-way valve (5) action control the on-off of the external air source and the cylinder (7) comprises:
when the port P and the port B of the second two-position five-way valve (5) are communicated, the cylinder (7) keeps the former action state; and the port P of the second two-position five-way valve (5) is communicated with the port A, so that the cylinder (7) acts.
7. The control method according to claim 5, wherein when the external air source is disconnected, the current states of the first double pressure valve (3), the second double pressure valve (4), the first two-position five-way valve (2), the second two-position five-way valve (5), the shuttle valve (6) and the foot valve (1) are all kept unchanged.
8. The control method according to claim 5, wherein controlling the first two-position five-way valve (2) action through the foot valve (1) or the shuttle valve (6) comprises:
if the P port of the pedal valve (1) is communicated with the A port, the P port of the first two-position five-way valve (2) is communicated with the A port, the first two-position five-way valve (2) is controlled to act through the shuttle valve (6), and meanwhile, the second two-position five-way valve (5) is controlled to act through the first double-pressure valve (3) or the second double-pressure valve (4);
if the P port of the pedal valve (1) is communicated with the B port, and the P port of the first two-position five-way valve (2) is communicated with the B port, the action of the first two-position five-way valve (2) is controlled through the pedal valve (1).
9. The control method according to claim 8, wherein if the P port of the foot valve (1) is communicated with the a port, the P port of the first two-position five-way valve (2) is communicated with the a port, and controlling the first two-position five-way valve (2) to operate through the shuttle valve (6) comprises:
if the current state of the second two-position five-way valve (5) is that the port P is communicated with the port A, the second double-pressure valve (4) controls the air outlet of the shuttle valve (6) to be air, and the shuttle valve (6) controls the first two-position five-way valve (2) to act;
if the current state of the second two-position five-way valve (5) is that the P port is communicated with the B port, the first double-pressure valve (3) controls the air outlet of the shuttle valve (6) to be air, and the shuttle valve (6) controls the first two-position five-way valve (2) to act.
10. The control method according to claim 8, wherein if the P port of the foot valve (1) communicates with the a port, the P port of the first two-position five-way valve (5) communicates with the a port, and controlling the spool operation of the second two-position five-way valve (5) through the first double pressure valve (3) or the second double pressure valve (4) includes:
if the current state of the first two-position five-way valve (2) is that the port P is communicated with the port A, the second two-position five-way valve (5) is controlled to act through the second double-pressure valve (4);
if the current P state of the first two-position five-way valve (2) is that the port is communicated with the port A, the second two-position five-way valve (5) is controlled to act through the first double-pressure valve (3).
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