JPS589308B2 - Valve control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve control device, and particularly to a valve control device that continuously adjusts the pressure, flow rate, etc. of a fluid by controlling the operation of a piston of a valve.

For example, as a device for controlling the pressure and flow rate of fluid flowing through a piping system, a manifold is used to control the pressure and flow rate of fluid flowing through a piping system. BACKGROUND OF THE INVENTION Valve-type valve control devices have been well known.

However, with such a valve control device, it is difficult to obtain a steady flow because the pressure and flow rate suddenly decrease when the valve is opened and closed.

Therefore, for example, when this valve control device is adopted in a hydraulic piping system for the injection ram of an injection molding machine, it has the disadvantage that not only will the free surface of the molded product become corrugated, but also the non-free surface will become rough. .

In addition, this type of valve control device requires a large number of valves, resulting in a large and complex structure and high cost.

Further, it has the drawback that not only is the operation troublesome due to valve switching, but also that only a specific pressure value or flow rate can be set, and stepless control cannot be performed.

Therefore, recently, a piston-type valve control device that controls the operation of a piston by electromagnetic means has been provided as a device for controlling pressure and the like in multiple stages using only one valve.

Such an electromagnetic valve control device excites a solenoid and controls the position of the piston using its attractive force.

This device is applied to, for example, a balanced piston type relief valve, and can perform continuous, stepless remote control.

However, it not only cannot completely eliminate pulsation, which is an inherent drawback of electromagnetic devices, but also has the major drawback that it is expensive because it requires a constant voltage source.

The object of the present invention is to provide a valve control device which eliminates the drawbacks of the known techniques as described above, has a simple structure, allows stable stepless operation, and is easy to operate.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, a valve control device 10 according to the present invention includes a cylinder 12 housing a reciprocating piston 14, the piston having a rod 18 with a head 16.

The cylinder 12 includes a main body 20 with one end open and a cover 22 fixed to the main body with bolts 21 to close the open end, and a chamber 24 is defined by the main body and the cover.

The cylinder body 20 has a side wall formed with a pair of radial flow holes 26 and 27 for allowing a strut fluid such as air or oil to flow into or out of the chamber 24, and a piston rond 18 and a guide. It is configured integrally with a closed end.

Reference numeral 35 indicates that the piston 14 is in contact with the piston rod 18.
A setting member is shown for controlling the reciprocating movement of the piston by setting the return movement position, that is, the upper limit position, and this setting member is a position setting member 36 that is screwed into a tap hole of the cover 22 and extends into the chamber 24 of the cylinder. a rotatable actuating member, such as a hand wheel 38 fixed to the setting member by means of bolts 39, for axially moving the setting member; and a retaining nut 40 for maintaining the set position of the setting member accurately.
It is composed of:

The cylinder is connected to an adapter 64 by a connecting stage 54.

The connecting stage 54 is then press-fitted into an axial hole 58 drilled in the closed end of the cylinder, and is connected to a connecting member such as a pin 56 that is slidable in a corresponding axial hole 62 of the adapter 64. The coupling 66 is screwed into the externally extending externally threaded cylindrical portion 68, and the coupling is screwed into a radial tapped hole 72 formed in the coupling and inserted into an annular groove 74 formed on the outer periphery of the guide portion 28. set screw 7
0 and a driving member.

Here, the annular groove 74 is formed with a width larger than the diameter of the set screw.

The valve control device 10 includes, for example, a separate piping system 7.
6 by an adapter 64.

This relief valve 78 is a known balance piston type relief valve, and a balance piston 82 is disposed between flow paths 80 and 81.

A valve switching section 86 like a poppet is biased upward by a compression spring 84 and pushed against the lower end of the piston rod 18.

The adapter 64 has a hollow cylindrical part 68 formed with a male thread to which the coupling 66 is screwed, and a hollow cylindrical part 8 formed with a male thread to be screwed into the tap hole of the relief valve.
8 and, for example, a hexagonal rotation drive section 90 for rotationally driving the adapter.

A taper pin 92 for preventing the piston 14 from coming off is attached to the tip of the piston rod 18, and a shoulder 94 on which the taper pin comes into contact is formed on the inner surface of the adapter 64.

Further, a hole 96 for attaching a taper pin is formed through the adapter 64.

The operation of the valve control device 10 configured as above will be explained below.

The valve control device is the rotary drive unit 9 of the adapter 64.
0 is attached to the relief valve 78 of the piping system 76 separately by rotating it with a spanner or the like.

The attachment position of the cylinder 12 to the adapter 64 is determined by the screwing position of the coupling 66 to the adapter 64, and is ensured accurately by screwing the retaining nut 42 into the hollow cylindrical portion 68 of the adapter 64 and abutting against the coupling. be done.

By setting the cylinder 12 at a predetermined position, the lower limit position, that is, the maximum protrusion position of the piston is determined.

On the other hand, the upper position of the piston 14, that is, its retracted position, can be accurately and variably set by rotating the handle wheel 38 to move the positioning member 36 in the axial direction and fixing it with the retaining nut 40. .

Instead of a manual wheel, the setting member may be moved automatically and remotely, for example in conjunction with a pulse motor.

By setting the upper and lower positions of the piston 12 in this manner, the stroke of the piston is determined.

On the other hand, the speed of the reciprocating motion of the piston 14 is freely controlled by the control fluid flowing into or out of the chamber 24 through the communication holes 26 and 27 by one or two actuators (not shown).

Resilient materials, such as helical compression springs, may be disposed on either side of the piston head to supplement the force pushing the control fluid onto the piston head.

Oil is preferable to air as the control fluid from the viewpoint of shrinkage.

Cylinder 12, cover 22 and retaining nuts 40, 42
It is preferable to process the roller so that it can be held and rotated easily.

As mentioned above, the cylinder 12 is connected to the adapter by a pin 56 that is press fit into the axial bore 58 and slides within the axial bore 62 of the adapter 64.

Further, a coupling 66 is screwed onto the adapter 64, and a set screw 70 attached to the coupling is inserted into an annular groove 74 of the guide portion 28 of the cylinder, and the neck groove is formed with a width larger than the diameter of the set screw 7. It's been done.

With this configuration, when the coupling 66 is rotated, the portion of the set screw 70 inserted into the annular groove 74 rotates along the groove while pressing its upper or lower end surface.

Cylinder 12 is therefore moved axially while sliding bottle 56 within bore 62.

In other words, the position of the cylinder 12 can be freely set without any rotation itself.

After the coupling 66 is rotated to set the position of the cylinder 12, the retaining nut 42 is abutted against the coupling 66 so as to accurately maintain that position.

By freely setting the position of the cylinder 54 in this manner, the maximum protruding position of the cylinder can be set over a wide range, and therefore the operating pressure of the valve switching section 86 of the relief valve 78 can be freely controlled.

The pin 56 is press fit into the hole 62 of the adapter and the hole 58 of the cylinder.
It goes without saying that the inside may be slidable, and that it can be fixed by other means, such as screwing, instead of press-fitting.

Further, by providing a circular groove 17 as shown in the figure in the piston head 16, not only can the overall length of the valve control device be reduced, but also it can be used as a mounting seat when an auxiliary elastic member for replenishing the pushing force is provided.

FIG. 2 shows another preferred embodiment that differs from the embodiment shown in FIG. 1 in the way the cylinder is connected to the adapter.

In the embodiment of FIG. 2, the cylinder 100 has an inwardly extending, e.g., annular, extension 104 that connects the adapter 64.
The coupling 1 is screwed onto the cylindrical portion 68 on the cylinder side of the
02, and the neck-shaped groove 1 is bolted to the closed end of the cylinder.
03 on the outer periphery of the cylinder, and a headed pin 110 fixed to the ring material and slidable within an axial hole 112 formed in the adapter 64.

Here, the extending portion 104 of the coupling extends into the annular groove 103 and is formed so as to be able to come into contact with the upper surface of the ring material 106 and the lower surface of the cylinder 100.

Therefore, like the embodiment shown in FIG. 1, this valve control device 10 can also freely move the cylinder 100 in the axial direction by rotating the coupling without rotating the cylinder 100.

Therefore, the operation of the relief valve (not shown) to which the valve control device 10 is attached can be easily and sufficiently controlled.

The actuator 113 can be easily attached to the cylinder 100 if the pair of flow holes 26 and 27 for the inflow and outflow of the control fluid are bored 90° apart as shown (the hole 26 is not shown). Therefore, it is preferable.

Further, if the actuator 113 is of a two-way valve type, only one @ is sufficient, and an air-oil converter is preferable from the viewpoint of operability.

The valve control device according to the present invention can be easily multi-staged by combining unitized components. As an example, a multi-type valve control device corresponding to the valve control device shown in FIG. 1 is shown in FIG. 3. Shown below.

As can be seen from the figure, the multi-type valve control device 210 is similar to the valve control device 1 shown in FIG.
0, but with a piston 114 and an intermediate cover 12.
The main difference is that it has the following features.

However, this difference is due to the fact that the rod 118 of the piston 114 is formed integrally with the above-mentioned positioning member 36 and the piston rod 18, and the intermediate cover 122 or the above-mentioned cover 22 and the cylinder hole 68 of the adapter are formed integrally. The components of the dog portion at the points indicated above correspond to the components of the valve control device 10 described above.

In other words, by arranging the piston 114 and the intermediate cover 122 at the connection point and combining the same structural members, it is possible to have not only two stages but an infinite number of stages.

As described above, the valve control device of the present invention has a chamber set inside the chamber, and a cylinder having a pair of communication holes spaced apart in the axial direction for allowing control fluid to flow in and out of the chamber. The piston rod has a piston rod that divides the chamber into two so as to communicate with the pair of communication holes, and detects the fluid pressure within the chamber that acts on the piston rod and separately operates the valve switching section of the piping system to suppress the valve. A piston that controls the operation of the switching part; and a setting member that is arranged outside the cylinder so that it can be inserted into the cylinder and comes into contact with the piston rod by the operation to set the return movement position of the piston. There is.

In such a configuration, the piston can reciprocate within the cylinder by flowing the control fluid into and out of the chamber of the cylinder through the communication hole.

The return movement position of the piston is set by the setting member, and the movement position of the piston is set by the closing part of the cylinder.

In other words, the piston reciprocates between a pair of predetermined movement positions corresponding to the stroke.

Such a configuration enables stable stepless operation because the return movement position of the piston can be freely set using the setting member.

In addition, the present invention does not require a large number of valves as is known in the art, so the structure can be simplified.

The valve control device of the present invention is attached to an adapter by fixing its cylinder to the adapter, and the adapter is separately attached to a valve in a piping system.

Specifically, the cylinder of the valve control device is connected to the adapter via a connecting means comprising a coupling, a driving member and a connecting member.

That is, the coupling is rotatably connected to the adapter,
The driving member rotates integrally with the coupling, and by rotating, moves the cylinder in the axial direction.

A connecting member is also disposed between the cylinder and the adapter.

This connecting member is fixed to one of the axial holes formed on the lower surface of the opposing cylinder and the upper surface of the adapter, and is loosely fitted into the other hole, so that the cylinder is relative to the adapter. The cylinder is connected to the adapter while allowing relative axial movement of the cylinder while preventing physical rotation.

With such a configuration, the cylinder can be moved in the axial direction without rotating with respect to the adapter, so it is easy to separately attach the valve control device to the piping system.

In other words, it is possible to prevent the conduit for the control fluid connected to the flow hole from being wrapped around the cylinder.

Furthermore, even after being separately installed in a piping system, the cylinder can be independently moved freely in the axial direction without releasing the installation, making control operations easy.

It goes without saying that if the cylinder is moved in the axial direction, the stroke itself of the piston remains unchanged, but the relative protrusion amount of the piston with respect to the piping system changes.

As described above, according to the present invention, not only can the amount of protrusion of the piston be freely and variably set, but also the rate of protrusion of the piston can be controlled by controlling the rate of inflow and outflow of the control fluid flowing into and out of the chamber of the cylinder. Similarly, a steplessly controllable valve control device that can be freely and variably set can be provided.

Further, this valve control device can be easily constructed into a multi-stage multi-system.

The valve control device according to the present invention, when attached to a relief valve, for example, can steplessly control the operating pressure of the pilot valve by adjusting the pressing force of the pilot adjustment spring depending on the amount of protrusion of the piston.

Furthermore, by attaching it to a flow rate control valve, switching valve, etc., the flow rate can be controlled steplessly or the flow path can be changed.

The above embodiments are for explaining this invention, and this invention is not limited to the configuration of the embodiments, and modifications, substitutions, etc. can be made without departing from the technical scope and technical idea of this invention. Needless to say, it also includes.

[Brief explanation of the drawing]

The drawings are partially cutaway front views of preferred embodiments of the present invention, with FIGS. 1 and 2 showing the piston in its lower limit position, and FIG. 3 showing the embodiment shown in FIG. The configurations are shown in each case. 10, 210...Two valve control device, 12...Cylinder, 14...Piston, 16...Piston head,
18, 118...Piston rod, 24...Chamber,
26, 27... Communication hole, 35... Setting member, 54... Cylinder, 56... Pin, 58, 62... Axial hole,
64...Adapter, 66...Coupling, 7o...Set screw, 74...Annular groove, 76...Separate piping system, 78...Relief valve, 86...Valve switching section.

Claims (1)

[Scope of Claims] 1. A cylinder having a chamber therein and a pair of communication holes spaced apart in the axial direction for allowing a control fluid to flow in and out of the chamber; It has a piston rond that divides the chamber into two so as to communicate with a pair of circulation holes, and the fluid pressure in the chamber that acts on the piston rond suppresses the valve switching part of the valve in the piping system, thereby switching the valve. a piston that controls the operation of the piston; a setting member that is arranged outside the cylinder so that it can be inserted into the cylinder and that comes into contact with the piston rod and sets the return movement position of the piston; an adapter that is separately attached to a valve in a piping system; a coupling that is rotatably connected to the adapter; and a coupling that is rotatably arranged integrally with the coupling and extends radially inward and is formed on the outer periphery of the cylinder. A driving member that engages with the annular groove to move the cylinder in the axial direction as the coupling rotates, and one of the axial holes formed in the lower surface of the opposing cylinder and the upper surface of the adapter. a connecting member that connects the cylinder to the adapter by being fixed in one hole and loosely fitted in the other hole, thereby preventing relative rotation of the cylinder with respect to the adapter and allowing relative axial movement of the cylinder; A valve control device comprising: a connecting means having; and a valve control device comprising;