JPS60249777A - Structure of high-speed fluid valve - Google Patents

Abstract

PURPOSE:To obtain the structure of a fluid valve which can control with quick response by providing a rod valve comprising an on-off control valve using a solenoid, which can be operated at high speed, and performing pulse width control with high frequency. CONSTITUTION:An open-and-close valve assembly 10 comprises a base 12 and a cover 14 which are airtightly disposed. Control passages Ps, C1 where pressurized fluid is circulated are disposed in the base 12. A valve seat 18 having a valve port 18a connecting both passages Ps, C1 to each other is provided between both control passages Ps, C1. A rod valve 20 is disposed on the valve port 18a. The rod valve 20 is pressed to the valve port 18a by a spring 28, and regularly closed. On the other hand, a solenoid block 32 is disposed in a space 12a and adapted to attract a movable iron piece 30. The rod valve 20 is moved axially against a spring 28 by the movable iron piece 30.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a high-speed fluid valve structure, and particularly to a high-speed fluid valve structure that is capable of controlling the flow path of a hydraulic or pneumatic actuator on and off with good responsiveness. It is.

[Prior Art] Fluid actuators are used to perform predetermined movement or positioning in various hydraulic or pneumatic control devices, and various fluid valves are used to control the supply of pressure fluid to these actuators. ing.

Conventional general fluid valves use a device that opens and closes the valve port using a spool that is driven reciprocally within the valve cylinder by a solenoid, etc. According to this conventional device, only on/off control of the valve port is performed. However, there was an advantage that the flow rate and pressure of the pressure fluid could be arbitrarily adjusted by selecting the stop position of the spool.

However, such conventional spool-type fluid valves have the disadvantage that their response speed is slow and quick control is impossible, and they are not suitable for high-speed and high-performance hydraulic or pneumatic equipment. there were.

In particular, in recent years various robot devices require extremely delicate movements of the arms, which are actuators, and precision robots require responsiveness that takes into account changes in the overall weight balance when the arms and whites move. Fast control is required, and there has been a strong demand for a fluid valve structure suitable for such precise control.

[Object of the Invention] The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a fluid valve structure suitable for precise control with quick response.

In particular, the fluid valve itself is an on/off control valve that cannot control the flow rate, and this on/off control can be operated at high speed.As a result, by performing pulse width control at high frequency, flow rate and other arbitrary control can be performed. By performing pulse width modulated control, it is possible to achieve extremely superior control characteristics that have never been seen before.

[Structure of the Invention] In order to achieve the above object, the present invention includes a valve seat having a valve port that communicates with a control flow path, and a valve seat that is arranged in an axial direction so that the tip contacts and separates from the valve seat to open and close the valve port. a rod valve that is movably supported by a shaft; a spring means that biases the rod valve in one predetermined axial direction; (b) includes an opening/closing valve assembly having a movable iron piece that controls movement against the direction of force, and a solenoid that attracts the movable iron piece excited by an external input command; the valve opening is opened by axial movement of the rod valve; It is characterized by on/off control.

[Explanation of Examples] Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred first embodiment of the fluid valve structure according to the present invention, in which a plurality of on-off valve assemblies 10 are arranged in parallel, but only a single assembly 10 is shown in the figure. It is shown. The on-off valve assembly 1o includes a base body 12 and a lid body 14, between which a sealing material such as an O-ring 16 is inserted in a compressed state.
The flow path provided within the on-off valve assembly 10 is sealed.

The base body 12 is provided with a control flow path through which a pressure fluid (in the embodiment, high pressure air) flows, and in the embodiment, the control flow path includes a flow path P connected to a fluid pressure source and a flow path C7 connected to the load side. including.

A valve seat 18 fixed to the base body 12 is provided between both control channels P and 01, and its valve port 18a communicates both channels P and C1.

A characteristic feature of the present invention is that a rod valve 20 is provided that contacts and opens with respect to the valve seat 18, and the tip 20a of the rod valve 20 contacts the valve seat 18. to close the valve port 18a, and the tip 20a separates from the valve seat to open the valve port 18a.The rod valve 20 is pivoted to be movable in the axial direction to open and close the valve port 18a. In the embodiment, the rod valve 20 is pivotally supported at approximately the center by a bearing 22 fixed to the base 12.

A spring receiver 24 is press-fitted to the other end of the rod valve 20, and a spring 28 is inserted in a compressed state between it and a spring seat 26 screwed to the lid 14. As a result, the rod A spring 28 always applies a downward biasing force to the valve 20, that is, in a direction to close the valve port 18a.

Therefore, in the illustrated embodiment, under normal conditions:
It is understood that the rod valve 20 is urged toward the valve seat 18 by the spring 28, and the valve port 18a blocks both control flow paths Ps101.

In the embodiment, since the spring seat 26 is screwed to the lid 14, the biasing force applied to the rod valve 20 from the spring 28 can be adjusted by adjusting the screwing amount.

A movable iron piece 30 is provided in order to move the spring-biased rod valve 20 in the valve opening direction against the spring biasing force, and the movable iron piece 30 is attached to the base body 12.
The cage is loosely inserted into the empty chamber 12a provided in the
It is possible to move freely within the empty space 12a. The rod valve 20 passes through a through hole 30a provided at one end of the movable iron piece 30, and the spring receiver 24 is in contact with the upper side of the movable iron piece 30.

A solenoid block 32 is provided above the movable iron piece.
is placed and when it is energized, the movable iron piece 30 is attracted as shown in FIG.

The solenoid block 32 has two solenoids 34 and 36.
An armature 42 made of a laminated plate is riveted to the core 38.40 of each solenoid 34.36. Solenoid block 32 configured in this way
are firmly fixed to the lid body 14 by rivets 44.

Therefore, as shown in the figure, when each solenoid 34.36 is energized by an external input command, the movable iron piece 30 is attracted to the core 38.40 against the urging force of the spring 28, and as a result, the rod valve 20 is Valve port 18a can be opened.

As described above, according to this embodiment, when no current is supplied to the solenoid block 32, the rod valve 2
0 is urged toward the valve seat 18 by the spring 28, and the valve port 18a is reliably closed, thereby opening the flow path P and the flow path C.
1 is completely cut off.

On the other hand, due to an input command from the outside, solenoid 34.3
6 is energized, the rod valve 20 is quickly moved away from the valve seat 18 by suction movement of the movable iron piece 30, and the valve port 18a can be opened. By quickly controlling the on/off of the valve port 18a, the control fluid from the fluid pressure source is supplied toward the load side C1 with a small delay, and the electromagnetic device of the present invention has a high responsiveness. Since it is fast, it is possible to perform on/off control at high frequencies, and it is possible to control hydraulic or pneumatic control equipment such as various robots quickly and with high precision.

FIG. 2 shows a schematic configuration of a pneumatic switching circuit of a pneumatic actuator in which a plurality of on-off valve assemblies 10 of the present invention are arranged in parallel. The pneumatic switching valve 50 includes a pressure source flow path P3, an atmospheric release flow path Ex, and a load side flow path C1C2. The load-side flow path C2 is communicated with the chamber.

The pneumatic switching circuit 50 includes 14 on-off valve assemblies 10-.
1 to 10-14 are provided. The four on-off valve assemblies 10-1 to 1o-4 are used to open the load side flow path C1 to the outside, and the assemblies 10-5 to 1o-4 are used to open the load side flow path C1 to the outside.
Three o-7 are used to apply source pressure to the load side flow path C1. Similarly, assemblies 10-8 to 10-
Three assemblies 10 are used to apply source pressure to the load-side flow path C2, and four assemblies 10-11 to 10-14 are used to open the load-side flow path C2 to the outside air. It will be done.

A control circuit block 56 is provided to selectively supply external input commands to each of the solenoids of the 14 on-off valve assemblies 10-1 to 10-14. The selected on-off valve assembly will be activated. The control circuit block 56 includes a comparator 62 and an arithmetic unit 64 that compare the external command and the position detection signal from the position detector 60 of the pneumatic actuator 52, and controls each opening/closing valve assembly 1 according to the current position of the actuator 52.
By supplying the desired excitation signal to 0, the desired pulse width can be controlled, and the flow rate, pressure, and speed of the control fluid can also be controlled, allowing the actuator to move quickly and achieving highly accurate positioning. can do.

In the embodiment, in addition to the duty ratio control described above, flow rate control is also performed by controlling the number of operating valve assemblies that are installed (3 to 4) for each flow path. Extremely delicate actuator control can be achieved by combining various types of control.

Further, in the present invention, by setting the valve opening areas of each of the on-off valve assemblies 10 to be different from each other, and by combining these areas, even more fine control of the flow rate or flow rate can be achieved.

FIG. 3 shows a second embodiment of the high-speed fluid valve structure according to the present invention, in which the same or corresponding members as in the first embodiment are given the same reference numerals and their explanations will be omitted.

The characteristic feature of the second embodiment is that the rod valve tip @2
0 a consists of a ball valve, and a cylindrical valve seat 1
8 to form a leak-free valve.

Further, in the second embodiment, the tip of the spring seat 26 approaches the spring receiver 24, and the tip also serves as a stopper for stopping the rod valve 20 upward. Therefore, in the second embodiment, even when the solenoid 34, 36 is energized, the spring receiver 24 is brought into contact with the spring seat 26 at its stop position, so that the movable iron piece 30 is in complete contact with both cores 38, 40. It is sucked with a slight gap without
As a result, when the excitation to the solenoid 34, 36 is cut off, the movable iron piece 30 can quickly move away from the core 38, 40, increasing the responsiveness of the device.

FIG. 4 shows a third preferred embodiment of the high-speed fluid valve structure according to the present invention.
Embodiments are shown, and the same or corresponding members as in each of the above-mentioned embodiments are given the same reference numerals, and their explanations will be omitted.

What is characteristic about this example is that the spring 28 biases the rod valve 20 in the direction of separating it from the valve seat 18. For this purpose, the spring seat 26 fixed to the base 12 A spring 28 is inserted in a compressed state between the spring receiver 24 and the spring receiver 24 fixed to the upper end of the rod valve 20. Therefore, the rod valve 20 is always urged upward by the spring 28.

One end of the movable iron piece 30 is held between the spring receiver 24 and the holder 66, and its narrow end is held in contact with the yoke 68 of the solenoid block 32. The free end is the movable iron piece 30
is held pressed against the yoke 68.

Therefore, according to the third embodiment, when an external input command is applied, the solenoid 34 attracts the movable iron piece 30 and the valve port 18a can be quickly closed by the ball valve 20a.

FIG. 5 shows a fourth embodiment of the present invention, in which the same or corresponding members as in each of the previously described embodiments are denoted by the same reference numerals, and their explanation will be omitted.

The characteristic feature of the fourth embodiment is that when the rod valve 28 is urged to open from the valve seat 18 by the spring 28,
The impact of the movable iron piece 30 pushed upward by the spring receiver 24 is softened by the buffer stopper 72 provided on the lid 14, and for this reason, there is a gap between the buffer stopper 72 and the lid 14. A damper 74 made of rubber or the like is inserted. Furthermore, in this fourth embodiment, a permanent magnet 76 is provided on the lid body 14 in order to increase the speed when the O-rad valve 20 is moved in the opening direction by the spring 28 when the solenoid block 32 is de-energized. As a result, the movable iron piece 30 is always preloaded toward the permanent magnet 76, and the valve port 18a can be opened quickly.

6 and 7 show a preferred embodiment of the rod valve tip of the present invention.

FIG. 6 shows a structure in which a conical valve 20a is provided at the tip of the rod valve 20, and can perform a good flow path opening/closing action with the valve seat 18. Furthermore, the rod valve 20 shown in FIG. 7 has a structure consisting of a cylindrical valve 20a whose tip slides in the valve port 18a, and the stroke required for the rod valve 20 is longer than that of other structures. It has the advantage that there is little wear on the contact/separation part and it has excellent durability.

[Effects of the Invention] As explained above, according to the present invention, it is possible to provide a high-speed fluid valve structure that quickly controls the on/off opening and closing of a valve port, which is extremely suitable for various hydraulic or pneumatic actuators. It has the advantage of providing a suitable valve structure.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a preferred first embodiment of the high-speed fluid valve structure according to the present invention, and Fig. 2 shows a plurality of on-off valve assemblies according to the present invention arranged in parallel to operate a pneumatic actuator. 3 is a sectional view showing a second preferred embodiment of the high-speed fluid valve structure according to the present invention; FIGS. 4 and 5 are main parts showing the third and fourth embodiments of the present invention, respectively. 6.7 are sectional views of essential parts showing the tip structure of a rod valve suitable for the present invention. 10... Opening/closing valve assembly 18... Valve seat 18a... Valve port 20... Rod valve 22... Bearing 28... Spring... 30... Movable iron piece 32... Solenoid Blocks 34, 36...Solenoid P8...Pressure source flow path EX...Open flow paths c, c2...Load side flow path. Applicant: Tokyo Precision Measuring Instruments Co., Ltd. Agent: Patent attorney: Kenji (1st year) (1 other person) Figure 1 Figure 2 ↓ Figure 3 Figure 4

Claims (1)

[Scope of Claims] (1) A valve seat having a valve port communicating with a control flow path, and a shaft supported so as to be movable in the axial direction so that the tip contacts and separates from the valve seat to open and close the valve port. a spring means for biasing the rod valve in one predetermined axial direction, one end of which engages the rod valve to bias the rod valve against the biasing direction of the spring means; It is characterized by including an opening/closing valve assembly having a movable iron piece whose movement is controlled and a solenoid which is excited by an external input command and attracts the movable iron piece, and on/off control of the valve port is controlled by the axial movement of the rod valve. High-speed fluid valve structure. (2. In the structure described in claim (1), a plurality of on-off valve assemblies are arranged in parallel for the control flow path, and each on-off valve is combined and controlled on and off to control the control flow path. A high-speed fluid valve structure characterized by being able to control flow rate, etc. (3) In the structure described in claim (2), each opening/closing valve assembly has a valve port with a different opening area. High-speed fluid valve structure with