JPH0425524Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a pressure proportional control valve that can independently set the air pressure of two output ports. This invention relates to pressure proportional control valves.

[Prior Art] In a double-acting pneumatic cylinder, it may be necessary to maintain the air pressure in each pressure chamber at a desired pressure in order to maintain a load or the like.

The drive circuit of a conventionally known double-acting pneumatic cylinder is as follows:
For example, as shown in FIG. 3, the output ports A and B of the 5-port valve 1 and the drive chamber 2a of the fluid pressure cylinder 2,
The return chamber 2b is connected by pipes 3 and 4, and the valve part 5a of the electropneumatic pressure control valve 5 is connected to the pipe 3, and the manual pressure control valve 6 is connected to the pipe 4, respectively. Reference numeral 5b in FIG. 3 is a proportional output section for setting the air pressure of the valve section 5a to a pressure proportional to the input electric signal.

The above-mentioned known drive circuit uses an electropneumatic pressure control valve 5 to set the air pressure supplied to the drive chamber 2a at a pressure proportional to an input electric signal, and a manual pressure control valve 6 to set the air pressure supplied to the return chamber 2b to a desired level. However, since the plurality of valves 1, 5, and 6 are connected by pipes 3 and 4, there is a problem that the entire circuit becomes large and the installation space becomes large.

[Problems to be solved by the invention] The invention integrates a 5-port valve and two pressure control valves that separately set the air pressure of the two output ports of the 5-port valve, and adjusts the air pressure of the output port. The problem to be solved is to create a compact valve that can set the pressure to the desired pressure.

[Means for Solving the Problems] The present invention includes a piping body having a pressure fluid supply port, an exhaust port, and two output ports, a pressure proportional control section, two inlet ports, an outlet port, and an exhaust port. The pressure proportional control valve is a stacked pressure proportional control valve including a 5-port valve that switches each outlet port to an inlet port and an exhaust port for communication, and the pressure proportional control section connects the supply port and the 5-port valve of the piping body to each other. A center body having two input passages that communicate two inlet ports of a port valve, two output passages that communicate each output port with each outlet port, and an exhaust passage that communicates mutual exhaust ports, and a center body on both sides of the center body, and two pressure control valves to set the air pressure of each inlet port,
One of the above pressure control valves is an electro-pneumatic pressure control valve that sets air pressure proportional to an input electrical signal, and the other is a manual pressure control valve that sets air pressure proportional to the set urging force of a pressure regulating spring whose urging force is adjustable. The above problem is solved by using a control valve.

[Function] The piping body, the pressure proportional control section, and the 5-port valve are stacked, and the electro-pneumatic pressure control section is installed on both sides of the center body of the pressure proportional control section, which has a plurality of passages that communicate the piping body and each port of the 5-port valve. By providing a valve and a manual pressure control valve, not only can the space on both sides of the center body be effectively used to make the pressure proportional control valve more compact, but the pressure control valve can be easily installed, and multiple The trouble of connecting the valve with piping can be omitted.

By switching the communication between the ports of the five-port valve, the air pressure at one outlet port is set to a pressure proportional to the input electrical signal, and the other air pressure is set to a pressure proportional to the set biasing force of the pressure regulating spring.

[Embodiment] Fig. 1 shows a first embodiment of the present invention, and this pressure proportional control valve includes a piping body 11, a center body 15 of a pressure proportional control section 12, a 5-port electromagnetic valve 13, and the above-mentioned center body. It consists of an electropneumatic pressure control valve 16 and a manual pressure control valve 17 installed on both sides of the pressure control valve 15.

The piping body 11 has a pressure air supply port R, output ports A, B, and an exhaust port P, and the 5-port solenoid valve 13 has inlet ports ra, rb, outlet ports a, b, exhaust port p, and a pilot port.
pl ₁ , pl ₂ , center body 15 is connected to port R.
Two input paths 19a, 19 that communicate ra and rb
b, two output passages 20a and 20b that communicate ports A and a and B and b, an exhaust passage 21 that communicates ports P and p, and two pilot passages that communicate port R and pl ₁ and pl ₂ ( (Illustrations omitted)
It is equipped with

However, in the piping body 11, the supply port
R ₁ may be provided symmetrically to the port R, and the port R ₁ may be communicated with the ports rb and pl ₂ via a passage. In this way, the piping body 11 and the center body 15 can be formed symmetrically. .

In the above-mentioned 5-port solenoid valve 13, ports ra and a and b and p are communicated with each other by the pilot fluid from the pilot port pl ₁ due to the excitation of the solenoid, and the port rb is closed, and the pilot port pl is closed by the excitation of the solenoid being de-energized. Ports rb and b and a and p are communicated with each other by the pilot fluid from port ₂ .
It consists of a well-known pilot-type 5-port valve in which ra is closed.

The electropneumatic pressure control valve 16 includes a valve portion and a proportional output portion that sets the output pneumatic pressure of the valve portion to a pressure proportional to an input electric signal, which will be described later. The valve portion has a supply valve seat 26 in the input passage 19a, and a supply valve body 27 that closes the valve seat 26 from the port R side is biased in the closing direction of the valve seat 26 by a return spring. The discharge valve body 29, which is driven integrally with the supply valve body 27, faces a discharge valve seat 33 formed in the shell of a diaphragm 32 that partitions the feedback chamber 30 and the pilot chamber 31, and the discharge valve body 29 is driven together with the supply valve body 27.
closes valve seats 26 and 33 together when diaphragm 32 is in the neutral position shown.

The proportional output section includes a controller 34 to which an electrical signal is input, a pressure sensor 36 that converts the air pressure in the pilot chamber 31 acting through a port into an electrical signal and feeds it back to the controller 34, and a control valve 37.

The controller 34 compares the magnitude of the input electrical signal and the feedback electrical signal from the pressure sensor 36 and outputs a switching signal to the control valve 37. If the input electrical signal is larger than the feedback electrical signal, the controller 34 outputs a switching signal to the control valve 37. , input port 38 and output port 3
If the input electric signal is smaller than the feedback electric signal, the output port 39 and the exhaust port 49 are connected.
The input port 38 is connected to the port R side of the input passage 19a, and the output port 39 is connected to the pilot chamber 31.
Furthermore, the exhaust ports 40 communicate with the outside.

The electropneumatic pressure control valve 16 is connected to a controller 34
When an electrical signal for obtaining a set pressure is input, if the input signal is larger than the feedback signal, the input port 38 and output port 39 of the control valve 37 communicate with each other to increase the air pressure in the pilot chamber 31, If the input signal is smaller than the feedback signal,
The output port 39 of the control valve 37 and the exhaust port 40 communicate with each other to lower the air pressure in the pilot chamber 31, thereby setting the air pressure in the pilot chamber 31 to a pressure proportional to the input electrical signal.

When the air pressure in the pilot chamber 31 set in this manner is higher than the air pressure in the feedback chamber 30 fed back from port ra, the diaphragm 32 is displaced to the right in the figure and the supply valve body 27 is moved toward the supply valve seat 26. Since the port is opened, the port
The air pressure in RA and the feedback chamber 30 increases,
The air pressure in the pilot chamber 31 is the feedback chamber 3.
If the air pressure is lower than 0, the diaphragm 32 is displaced to the left in the figure and the discharge valve body 29 opens the discharge valve seat 33, so the air pressure in the port RA and the feedback chamber 30 decreases, and the pilot chamber 31
When the air pressure in the feedback chamber 30 becomes equal to the air pressure in the feedback chamber 30, the diaphragm 32 stops at the neutral position, the valve bodies 27 and 29 close the valve seats 26 and 33, and the air pressure in the input port ra becomes a pressure proportional to the input electrical signal. Set.

On the other hand, the manual pressure control valve 17 includes a valve section and a manual pressure regulating section. The above valve part has an input passage 19
A supply valve body 47 that has a supply valve seat 46 in b and closes the valve seat from the port R side is urged in the closing direction of the valve seat 46 by a return spring and is driven integrally with the supply valve body 47. The discharge valve body 49 faces a discharge valve seat 53 provided in the shell of a diaphragm 52 that partitions the first feedback chamber 50 and the pilot chamber 51, and the valve bodies 47 and 49 are arranged so that the diaphragm 52 is in the neutral position shown in the figure. At some point, the valve seats 46 and 53 are closed together, and the pilot chamber 51 is connected to the input passage 19 via the pilot passage and the fixed throttle 55 in the passage.
It communicates with the port R side of b.

The pressure regulating section is divided by a pressure regulating diaphragm 58 into a second feedback chamber 59 on the valve section side and a pressure regulating chamber 60 on the opposite side, and the second feedback chamber 59 communicates with the port rb side of the input passage 19b. , pressure control chamber 6
0 communicates with the outside through a bleed hole 61.

The pilot chamber 51 is communicated with a pressure regulating chamber 60 through a nozzle flapper mechanism 63 consisting of a nozzle and flapper at the tip of a port opened in the partition wall, and a shell 65 fixed to the middle part of the pressure regulating diaphragm 58 is connected to the nozzle flapper mechanism. The nut 67 in the pressure regulating chamber 60 is screwed onto a bolt 70 that rotates integrally with the handle 69, and is rotated in the axial direction. A pressure regulating spring 71 is installed between the shell 65 and the shell 65.

The manual pressure control valve 17 sets the air pressure at the port rb to a desired pressure by moving the nut 67 forward and backward by rotating the handle 69 and adjusting the biasing force of the pressure regulating spring 71. When the urging force of 71 is adjusted, the second feedback chamber 5
When the acting force of the air pressure 9 is smaller than the set biasing force of the pressure regulating spring 71, the pressure regulating diaphragm 58 is displaced to the left in the figure, the nozzle flap mechanism 63 is closed by the nozzle flap chamber of the shell 65, and the pilot chamber is closed. 51 air pressure increases,
The diaphragm 52 is displaced to the left and the supply valve body 47
opens the supply valve seat 46, and the air pressure in the port rb and the feedback chambers 50, 59 increases. Also,
When the acting force of the air pressure in the second feedback chamber 59 is larger than the set biasing force of the pressure regulating spring 71, the pressure regulating diaphragm 58 is displaced to the right in the figure.
Since the air pressure in the pilot chamber 51 decreases due to the opening of the nozzle flapper mechanism 63, the diaphragm 5
2 is displaced to the right, and the discharge valve body 49 is moved to the discharge valve seat 53.
Open port RB and feedback chamber 50,
59 air pressure decreases.

In this way, the air pressure at port rb rises and falls, and when the acting force of the air pressure in the second feedback chamber 59 becomes equal to the set biasing force of the pressure regulating spring 71, the diaphragm 52 stops at the neutral position and the valve bodies 47, 49 open. Since the valve seats 46 and 53 are closed, the air pressure at the port rb is set to a pressure proportional to the set biasing force of the pressure regulating spring 71.

In the first embodiment, when the solenoid of the 5-port solenoid valve 13 is excited to connect the ports ra and a and the ports rb and p, the air pressure at the inlet port ra is controlled by the electro-pneumatic pressure control valve 16. When the pressure is set to be proportional to the input electrical signal to the valve, and ports rb and b and ra and p are communicated by de-energizing the solenoid, the air pressure at the inlet port rb is set to the manual pressure control valve 17.
The pressure is set to be proportional to the set biasing force of the pressure regulating spring 71.

This pressure proportional control valve has a piping body 11, a pressure control section 12, and a 5-port solenoid valve 13 stacked one after another, and two pressure control valves 16 and 17 are installed on both sides of a center body 15 of the pressure control section 12. Since it has been installed, the piping body 11 and the 5 port solenoid valve 1
A plurality of passages 19a, 1 which communicate each port of 3.
By effectively utilizing the space on both sides of the center body where 9b, 20a, 20b, and 21 are opened, the pressure proportional control valve can be made compact, the pressure control valve can be easily installed, and multiple valves can be connected. It is possible to omit the piping required.

FIG. 2 shows a second embodiment of the present invention. The five-port solenoid valve 75, electropneumatic pressure control valve 76 and manual pressure control valve 77 of the second embodiment are all direct-acting types, and the electropneumatic pressure The proportional output section of the control valve 76 is a proportional solenoid 79 that outputs a driving force proportional to the amount of energization.
The valve part consists of a spool valve.

The sleeve 82 of the spool valve has openings 83, 84, 85 communicating with ports R, ra and the outside, respectively.
However, the opening 85 can also be communicated with the exhaust port P. A spool 86 that slides within the sleeve 82 switches the opening 84 into communication with the openings 83 and 85 and closes the opening 84 in the neutral position, and has a proportional solenoid 7 at one end.
A feedback chamber 87 on the other end side, on which the movable part 9 abuts, communicates with the port ra through a feedback passage (not shown), and a return spring 88 inside.
has been reduced.

The pressure regulating section is divided into a feedback chamber 92 and a pressure regulating chamber 59 by a pressure regulating piston 91 having a discharge valve seat 53, and the feedback chamber 92 is connected to port rb of the input passage 19b by a feedback passage.
The discharge valve body 49 communicates with the feedback chamber 9.
2 and faces the exhaust valve seat 53.

Other configurations and operations of the second embodiment include valves 75, 7.
Since it is the same as the first embodiment except that 6 and 77 are both direct-acting types, the same reference numerals are given in the drawings and detailed explanation will be omitted.

[Effects of the invention] The pressure proportional control valve of the present invention has a piping body, a pressure proportional control section, and a 5-port valve stacked, and pressure control valves are provided on both sides of the center body of the pressure proportional control section. By effectively utilizing the space on both sides of the center body, which has multiple passages that communicate the piping body and each port of the 5-port valve, no special space is required to install the pressure control valve, so the pressure proportional control valve The pressure control valve can be made compact, the pressure control valve can be easily installed, and piping connecting multiple valves can be omitted.

Furthermore, by using the electropneumatic pressure control valve and the manual pressure control valve, the air pressure at the two output ports of the 5-port valve can be set to an air pressure proportional to the input electric signal and the set biasing force of the pressure regulating spring. can.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the main part of the first embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the main part of the second embodiment of the same, and Fig. 3 is a schematic configuration diagram of a known double conductive cylinder drive circuit. be. 11... Piping body, 12... Pressure proportional control section, 13, 75... 5 port solenoid valve, 15... Center body, 16, 76... Electro pneumatic pressure control valve, 1
7, 77...Manual pressure control valve, 19a, 19b...
...Input passage, 20a, 20b...Output passage, 21
...exhaust passage, R...supply port, A, B...output port, P, p...exhaust port, ra, rb...inlet port, a, b...outlet port.

Claims (1)

[Claims for Utility Model Registration] A piping body equipped with a pressure fluid supply port, an exhaust port, and two output ports, a pressure proportional control section, two inlet ports, an outlet port, and an exhaust port, each outlet A pressure proportional control valve is a stacked pressure proportional control valve including a 5-port valve that switches the ports to an inlet port and an exhaust port for communication, and the pressure proportional control section connects the two inlets of the supply port and the 5-port valve of the piping body. A center body having two input passages that communicate ports, two output passages that communicate each output port and each outlet port, and an exhaust passage that communicates mutual exhaust ports, and air pressure of each inlet port on both sides of the center body. one of the pressure control valves is an electropneumatic pressure control valve that sets a pneumatic pressure proportional to an input electric signal, and the other is a pressure regulating spring whose biasing force is adjustable. A pressure proportional control valve characterized in that it is a manual pressure control valve that sets air pressure proportional to .