JP2571251Y2 - Laminated pressure control valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated pressure control valve constituting one laminated control element of a laminated control device constituting an operation control circuit.

[0002]

2. Description of the Related Art Heretofore, the applicant has considered a stacked pressure control valve of this type as shown in FIG. This laminated pressure control valve has a supply flow path P for supplying a pressure liquid, two load flow paths A and B connected to the liquid actuator side, and a discharge flow path R connected to the low pressure side. Each of the flow paths P,
A, B, and R are formed in the side surface 2 perpendicular to the upper and lower surfaces through which the through-opening is formed. provided bored hole 3B communicating with the main body 1, respectively, (hereinafter, the drilled holes will be described only the drilled hole 3A because it provided the same configuration.) drilled hole 3 a is provided in the stepped shape The step has a contact surface 5 facing the opening side, and a screw 6
The a, the drilled hole 3 in A and accommodated the sleeve member 8 having an opening and closing hole 9 and accommodated movably the main valve body 7 of a spool-shaped opening and closing by the movement of the main valve body 7, A pilot valve body 10 is movably housed therein, and a cover member 12 in which a pilot valve seat member 11 to which the pilot valve body 10 is detached is press-fitted and fixed is screwed into the screw portion 6 and tightened.
The sleeve member 8 is pressed against the contact surface 5 and the sleeve member 8 and the lid member 12 are pressed against each other to fix the members 8 and 12 in the perforated hole 3A.

[0003] An electromagnetic switching valve (not shown) is used for switching communication between the load flow path A and the supply flow path P.
From the state where the liquid actuator is operated and controlled by switching communication between the load flow path B and the discharge flow path R, the electromagnetic switching valve is set to the neutral position, and the flow paths P, A, B, and R are cut off to disconnect the liquid actuator. When the operation is stopped, the load flow path A becomes a negative pressure state due to the inertial force acting on the liquid actuator, and the liquid pressure in the load flow path B rises. It acts on the pilot valve body 10 by flowing through the throttle hole 7A and the through hole 11A of the pilot valve seat member 11,
When the acting force based on the pressure of the liquid acting on the pilot valve body 10 exceeds the force of the spring 13, the pilot valve body 10 moves rightward in the figure and separates from the pilot valve seat member 11, and the liquid flowing through the through-hole 11 A. Is Pilot Road 14
A, 14B, flow through the flow passage 15 and lead to the load flow passage A,
A pressure difference occurs around the throttle hole 7A due to the discharge of the liquid, and the main valve element 7 moves rightward in the drawing against the force of the spring 16 by the acting force based on the pressure difference to open the opening / closing hole 9 and open the load flow path. The liquid B flows through the flow path 15 and is led out to the load flow path A.
Thereby, the liquid pressure in the load flow path B is pressure-controlled to the set pressure set by the force of the spring 13.

[0004] In addition, an electromagnetic switching valve switches communication between the load flow path B and the supply flow path P, and switches communication between the load flow path A and the discharge flow path R to control the operation of the liquid actuator in the reverse direction. From this state, when the operation of the liquid actuator is stopped by setting the electromagnetic switching valve to the neutral position, the members arranged in the perforated holes 3B opened on the side surface 4 are used to carry out the operation of the load flow path A by the same operation as described above. The liquid pressure is pressure controlled.

[0005]

[Problems to be Solved by the Invention] However, the load flow path B
In order to prevent the liquid flowing through the throttle hole 7A of the main valve body 7 and the through hole 11A of the pilot valve seat member 11 from leaking from the pressure contact portion between the sleeve member 8 and the lid member 12, the sealing member 1 is attached to the pressure contact portion.
7 to provide liquid tightness, when performing maintenance work such as valve cleaning and inspection, loosen the tightening of the lid member 12, remove the sleeve member 8 and the lid member 12 from the perforated hole 3A, and then again When installing and mounting in the perforated hole 3, the two members 8, 1
The seal member 17 provided in the second press contact portion must be carefully removed and attached so as not to damage the seal member 17, and there is a problem that maintenance work is very troublesome.

The present invention has been made to solve the above-mentioned problems, and is intended to obtain liquid tightness without providing a seal member at a pressure contact portion of each member housed in a perforated hole, which presses each other.
It is an object of the present invention to provide a laminated pressure control valve that can easily perform maintenance work of the valve.

[0007]

In order to solve the above-mentioned problems, the present invention provides a manifold having a plurality of flow paths through which a liquid flows inside, and a supply flow path for supplying a pressure liquid and a liquid flow path connected to a liquid actuator. The load flow path and the discharge flow path connected to the low-pressure side are standardized on the upper and lower surfaces of the main body, and the stacked control elements having through-openings are selectively stacked. A stacked pressure control valve that constitutes one stacked control element of a stacked control device that constitutes an operation control circuit by installing a switching valve, and on a side surface that is orthogonal to the upper and lower surfaces through which each flow path of the main body passes through. A perforated hole is provided in the main body that is open and communicates with a flow path for pressure control, the perforated hole is provided in a stepped shape, has a contact surface facing the opening side, and is closer to the opening side than the contact surface. The main valve body has a threaded portion, one end face of which is in contact with the A main valve seat member to be seated, and a sleeve member accommodated movably the main valve body therein, successively yield instrumentation and a pilot valve seat member for seating the pilot valve body and the pressure control inside the respective members threaded portion of the channel distribution freely flow passage of liquid communicated formed from, movably accommodated to the cover member of the drilled hole the pilot valve body to the sitting <br/> to the pilot valve seat member to the interior for The main valve seat member, the sleeve member and the pilot
The valve seat member presses the main valve seat member against the contact surface of the drilled hole by tightening the lid member in the approaching direction, and the sleeve member.
And the pilot valve seat member between the main valve seat member and the lid member.
The respective members are fixedly provided by being pressed against each other, and the pressed portions of the respective members which are pressed against each other are formed on a flat surface so as to be liquid-tight by surface contact without providing a sealing member.

[0008]

In the structure of the present invention, the members housed in the perforated holes are fixed to each other by press-fitting portions formed on a flat surface by tightening the lid member so that they come into contact with each other and come into surface contact. Liquid tightness can be obtained without leaking from the pressure contact part where the surface contact is made, loosening the lid member and removing it from the drilled hole, the members fixed in the drilled hole are released and drilled It can be removed from the hole. For this reason, liquid tightness can be obtained without providing a sealing member at a pressure contact portion where the members housed in the perforated hole are pressed against each other, and removal and attachment of each member accompanying valve maintenance work are simplified. be able to.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in which a laminated pressure control valve is a laminated brake valve will be described below with reference to the drawings. 1 and 2, reference numeral 18 denotes a rectangular parallelepiped main body, a supply flow path P1 for supplying a pressurized liquid, two load flow paths A1 and B1 connected to the liquid actuator side, and a discharge flow path R1 connected to the low pressure side. And the upper and lower surfaces 19A and 19 formed flat.
It is standardized as B and has a through opening. Reference numeral 20A denotes a stepped and bottomed drilled hole formed in the main body 18, and upper and lower surfaces 19A,
An opening is provided on a side surface 21A orthogonal to 19B, and communicates with the load flow path B1 inside the main body 18. Reference numeral 20B denotes a stepped, bottomed drilled hole that opens on the side surface 21B facing the side surface 21A of the main body 18 and communicates with the load flow path A1 inside the main body 18. Hereinafter, since the perforated holes 20A and 20B have the same configuration, only one perforated hole 20A will be described. Drilled hole 20
A has a stepped portion having an annular contact surface 22A facing the opening side, and has a screw portion 23A at an opening end located on the opening side from the contact surface 22A.

Reference numeral 24A denotes a cylindrical main valve seat member, which has a through hole 25A penetrating therethrough, and has one end face accommodated in the perforated hole 20A so as to be in contact with the contact surface 22A. 26A is an O-ring provided on the outer peripheral surface of the main valve seat member 24A. The O-ring is provided so that the liquid flowing from the load flow path B1 to the perforated hole 20A does not leak between the contact surface 22A and the main valve seat member 24A. I have. 27A is a sleeve member formed in a cylindrical shape with a step. The spool-shaped main valve body 28A is movably housed inside, and is housed in a perforated hole 20A so as to be in contact with the main valve seat member 24A.
29A is four opening / closing holes of the sleeve member 27A,
The main valve body 28A extends radially from the inner peripheral surface to accommodate the main valve body 28A to the outer peripheral surface. Main valve body 28 housed in sleeve member 27A
A is closes the opening hole 29A in the outer peripheral surface seated on the biased main valve seat member 24 A by the spring 30A forces, the spring 3
Against 0A force is provided to open the opening and closing hole 29A by moving the rightward and lifted from the main valve seat member 24 A. 31A is a throttle hole penetrating through the main valve body 28A. 32
A is a cylindrical pilot valve seat member having a flange-shaped press-contact portion which is enlarged in the radial direction, and a cover member 3 described later in detail.
The sleeve member 2 is detachably fitted into the 3A fitting hole 34A.
It is housed in the perforated hole 20A so as to be in contact with 7A. 35A
Is a through hole penetrating through the pilot valve seat member 32A, and has a diameter larger than that of the throttle hole 31A. And the through-hole 25A
The throttle hole 31A and the through-hole 35A form a flow passage that allows the liquid to flow freely from the load flow path B1. The lid member 33A is detachably screwed to the screw portion 23A of the drilled hole 20A, and is tightened in a leftward approaching direction by a rotating operation to press the main valve seat member 24A against the contact surface 22A. At the same time, the members 24A, 27A, and 32A are provided so as to be freely pressurized and fixed to each other. Each member 24A, 27
The pressure contact portions of the A and 32A that come into pressure contact with each other are the liquid liquid flowing through the through hole 25A of the main valve seat member 24A, the throttle hole 31A of the main valve body 28A, and the through hole 35A of the pilot valve seat member 32A from the load flow path B1. It is formed on a flat surface so that the density can be obtained by surface contact.

Reference numeral 36A denotes a poppet-shaped pilot valve body which is movably housed inside the lid member 33A and has a through hole 35A.
A is provided on the pilot valve seat member 32A so as to be freely opened and closed so that A can be opened and closed. 37A is a spring for setting the pressure housed inside the lid member 33A. The spring is provided with a stronger spring force than the spring 30A, and the pilot valve body 36A is connected to the pilot valve seat member 32A.
It is provided so as to bias in the seating direction. 38A is a spring receiving member of the spring 37A, which is movably housed inside the lid member 33A. 39A is a closing member screwed to the lid member 33A, 40A is an adjusting member screwed to the closing member 39A so as to be able to advance and retreat, provided in contact with the spring receiving member 38A, and the spring receiving member 38A is moved forward and backward by a rotating operation. Through spring 3
The set pressure value can be changed by adjusting the 7A force.
Reference numeral 41A is a lock nut member which is screwed into the adjustment member 40A to fix the advance / retreat of the adjustment member 40A. Reference numeral 42A denotes a flow passage which is opened on the inner peripheral surface of the perforated hole 20A and communicates with the load flow passage A1, and the liquid in the load flow passage B1 flowing through the opening / closing hole 29A opened by the rightward movement of the main valve body 28A in the drawing. It is provided so as to be led out to the load flow path A1. 43A is a lid member 33
A pilot path that opens to the outer peripheral surface of A and communicates with the inside of the lid member 33A, 44A is a pilot path formed by recessing the outer peripheral surface of the sleeve member 27A in the axial direction, and is provided so as to communicate between the flow path 42A and the pilot path 43A. . The pilot passages 43A and 44A are provided with a liquid in a through hole 35A that opens when the pilot valve body 36A is moved rightward in the drawing. An O-ring 45A is provided on the outer peripheral surface of the lid member 33A so as to prevent the liquid flowing through the pilot paths 43A and 44A from leaking between the inner peripheral surface of the perforated hole 20A and the outer peripheral surface of the lid member 33A. Each member having the same configuration as the hole 20A is also provided in the hole 20B.
2B is provided so as to communicate between the perforated hole 20B and the load flow path B1. 46A is a mounting hole which penetrates and opens on the upper and lower surfaces 19A and 19B of the main body 18.

FIG. 3 shows a laminated control device which constitutes an operation control circuit using the laminated brake valve 46 of one embodiment shown in FIGS. 1 and 2 as one of the laminated control elements.
Is a manifold in which four flow paths 47A, 47B, 47C and 47D are formed, and the flow path 47A is connected to a pressure source 48,
The channels 47B and 47C are provided to be connected to a hydraulic motor 49 acting as an inertial force as a liquid actuator, and the channel 47D is provided to be connected to a tank T as a low pressure side. Reference numeral 50 denotes a stacked check valve serving as a stacked control element stacked on the manifold 47, which is connected to a pressure source 48 via a flow path 47A to supply a pressure liquid and a flow path 47B.
The two load flow paths A2 and B2 connected to the hydraulic motor 49 via the 47C and the discharge flow path R2 connected to the tank T via the flow path 47D are standardized on the upper and lower surfaces of the main body, and are opened through. A first flow passage for allowing a liquid flow from the discharge flow path R2 to the load flow path A2 and preventing the liquid flow in the opposite direction.
It has a check valve element 51A and a second check valve element 51B that allows liquid flow from the discharge flow path R2 to the load flow path B2 and blocks liquid flow in the opposite direction. The laminated brake valve 46 is connected to the manifold 4 via a laminated check valve 50.
7, a supply flow path P1 and two load flow paths A
1, B1 and the discharge flow path R1 are each a stacked check valve 5
0 are connected to the respective flow paths P2, A2, B2, R2. 5
Numeral 2 denotes an electromagnetic directional control valve installed at the uppermost stage on the manifold 47 via a laminated check valve 50 and a laminated brake valve 46, which switches communication between the supply flow path P1 and the load flow path A1 and loads the load flow path. A first switching communication between B1 and the discharge flow path R1.
A switching position b, a second switching position b for switching communication between the supply flow path P1 and the load flow path B1, and switching communication between the load flow path A1 and the discharge flow path R1, and each of the flow paths P1, A1, B1,. R1
And a neutral position c for shutting off the space.

Next, the operation of the above configuration will be described. Figure 3 shows a non-operating state of the laminated form CONTROLLER, directional control valve 5
2 is in the neutral position C and each of the flow paths P1, A1, B1, R1
And the hydraulic motor 49 is stopped. The laminated brake valve 46 has a pilot valve body 36A having a spring 37.
The through-hole 35A is closed by being urged by the A force and seated on the pilot valve seat member 32A, and the main valve body 28A is urged by the force of the spring 30A to be seated on the main valve seat member 24A and opened and closed on the outer peripheral surface. The hole 29A is closed, and the members housed in the perforated hole 20B are in the same state.

Now, when the electromagnetic directional control valve 52 is switched to the first switching position A, the pressurized liquid flowing from the pressure source 48 through the flow path 47A to the supply flow paths P2 and P1 is loaded. , A2 and the hydraulic motor 4
9, the liquid pressure motor 49 circulates the liquid through the flow path 47C, the load flow paths B2, B1, the discharge flow paths R1, R2, and the flow path 47D, draws out the liquid to the tank T, and rotates in one direction. At this time, the laminated brake valve 46 and the laminated check valve 50 are maintained in the state shown in FIG.

In this state, when the electromagnetic directional control valve 52 is returned to the neutral position C, the flow paths P1, A1, B1, R
1 is shut off, but the hydraulic motor 49 continues to operate in one direction due to the inertial force, so that the load flow paths A1, A2, and the flow path 47B are in a load state, and the flow path 47C, the load flow path B2, The pressure of the liquid B1 increases. Stacked check valve 50
Flows the liquid in the tank T through the flow path 47D and the discharge flow path R2 through the first check valve body 51A, and introduces the liquid into the load flow path A2. Further, in the laminated brake valve 46, the liquid whose pressure has increased in the load flow path B1 flows through the through hole 25A of the main valve seat member 24A, the throttle hole 31A of the main valve body 28A, and the through hole 35A of the pilot valve seat member 32A. When the acting force based on the liquid pressure acting on the pilot valve body 36A exceeds the force of the spring 37A, the pilot valve body 36A moves rightward in the drawing, and the pilot valve seat member 32
A, the through-hole 35A is opened and the liquid flowing through the through-hole 35A flows through the pilot passages 43A, 44A and the flow passage 42.
A flows out to the load flow path A1, and a pressure difference is generated around the throttle hole 31A due to the discharge of the liquid, and the main valve body 28A is acted on the basis of the pressure difference to move the main valve body 28A against the force of the spring 30A to the right in the drawing. To open the opening / closing hole 29A, and
Flows through the flow passage 42A and is led out to the load flow passage A1. As a result, the liquid pressure in the load flow path B1 is increased by the spring 37A.
The pressure is controlled to the set pressure set by the force, and the hydraulic motor 49 gradually stops its operation because the inertia force is gradually reduced.

When the electromagnetic directional control valve 52 is switched to the second switching position B and the hydraulic directional control valve 52 is returned to the neutral position C from a state in which the hydraulic motor 49 is rotated in the direction opposite to the one direction. , The load flow paths B1, B2, and the flow path 47C enter a negative pressure state, and the flow path 47B, the load flow paths A2, A1
Of liquid rises in pressure. The stacked check valve 50 introduces the liquid in the tank T to the load flow path B2 via the second check valve body 51B, and the stacked pressure control valve 46 is provided in the perforated hole 20B as described above. The liquid in the load flow path A1 flows through the flow path 42B by each member and is led out to the load flow path B1 to control the liquid pressure to the set pressure, and the operation of the hydraulic motor 49 is gently stopped.

With this operation, the main valve seat member 24A, the sleeve member 27A, and the pilot valve seat member 32A, through which the liquid in the load flow path B1 flows, have press contact portions formed on a flat surface by tightening the lid member 33A. It is fixed by pressure contact and surface contact, and the liquid flowing through the inside of each member 24A, 27A, 32A can be obtained liquid tight without leaking from the pressure contact portion where the surface contact is made. Since the members 24A, 27A, and 32A are released from being removed and can be removed from the receiving hole 20A by removing the members 24A, 27A, and 32A, the members 24A, 27A, and 32A can be liquid-tight without providing a sealing member at a press-contact portion of the members that press against each other. Can be obtained, and the removal and attachment of each member 24A, 27A, 32A accompanying the maintenance work of the valve can be simplified. Also, the lid member 33A
Since the members 24A, 27A and 32A can be easily removed by loosening the bolts and removing them from the perforated holes 20A, the maintenance work of the laminated type brake valve 46 is easy while the laminated brake valve 46 is laminated on the manifold 47. Can be done. Further, the sleeve member 27A and the pilot valve seat member
32A between the main valve seat member 24A and the lid member 33A.
Each member 24A, 27A, 32A can be fixed freely by pressing against each other
Since not provided, the fixed and unlocking of the pilot valve seat member 32A is obtained, et al is by loosening the clamping or tightening the lid member 33A, is press-fitted to such pilot valve seat member of a conventional valve closure member Pilot valve seat member 3
2A can be easily removed and attached, and replacement work can be easily performed when the pilot valve body 36A has to be repeatedly attached to and detached from the pilot valve seat member 32A for a long period of operation and needs to be replaced. In the embodiment, the laminated pressure control valve is a laminated brake valve. However, the laminated pressure control valve may be a laminated relief valve or a laminated sequence valve.

[0018]

As described above, according to the present invention, the supply flow path for supplying the pressure liquid and the two load flows connected to the liquid actuator side are provided on the manifold in which a plurality of flow paths for flowing the liquid are formed. The stack and the discharge path connected to the low pressure side are standardized on the upper and lower surfaces of the main body, and the stacked control elements having through openings are selectively stacked, and the electromagnetic directional control valve is provided at the top of the stacked control elements. A stacked pressure control valve that constitutes one stacked control element of a stacked control device that is installed to constitute an operation control circuit, and is opened on a side surface orthogonal to the upper and lower surfaces through which each flow path of the main body is opened. A perforated hole communicating with the flow path for pressure control is provided in the main body, the perforated hole is provided in a stepped shape, has a contact surface facing the opening side, and has a screw portion on the opening side from the contact surface. A main valve body having one end surface in contact with the contact surface in the drilled hole to seat the main valve body. A seat member, and the sleeve member accommodated movably the main valve body therein, successively yield instrumentation and a pilot valve seat member for seating the pilot valve body, a flow path for the pressure control inside the respective members a more distribution freely flow passage of liquid communicated formed, screwed detachably the pilot valve body to wear the seat to the pilot valve seat member the lid member accommodated movably to the interior threads of the drilled hole the sleeve member with provided retractably by rotational operation, the main valve seat member and the sleeve member and the pilot valve seat member is pressed against the main valve seat member by fastening the lid member to the approach direction to the contact surface of the drilled hole And the pilot
The valve seat member is pressed against each other between the main valve seat member and the lid member.
Each member is fixedly attached to each other, and a pressure contact portion for mutually pressing each member is formed on a flat surface so as to be liquid-tight by surface contact without providing a seal member, so that each member to be accommodated in a perforated hole is provided. Liquid tightness can be obtained without providing a seal member at the pressure contact portions that are in pressure contact with each other, and removal and attachment of each member accompanying maintenance work of the valve can be simplified. Also, by loosening the lid member and removing it from the drilled hole, each member to be housed in the drilled hole can be easily removed,
Maintenance work of the laminated pressure control valve can be easily performed while the valve is laminated on the manifold. further,
The sleeve member and the pilot valve seat member are combined with the main valve seat member and the lid.
Each member is fixed to each other by pressing against each other
Fried, fixed unlocking of the pilot valve seat member is obtained we are by loosening the clamping or tightening the lid member, as compared to such pilot valve seat member of a conventional valve to which are press-fitted to the lid member, the pilot The valve seat member can be easily removed and attached, and the replacement work can be easily performed when the pilot valve element has to be repeatedly attached to and detached from the pilot valve seat member for a long period of operation and must be replaced. Have.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a laminated brake valve as a laminated pressure control valve according to an embodiment of the present invention, in which a part of the laminated brake valve is not shown.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an operation control circuit diagram of a laminated control device using the laminated brake valve of one embodiment.

FIG. 4 is a cross-sectional view of a laminated type pressure control valve showing a conventional example, in which a part is not shown in cross section.

[Explanation of symbols]

 18 body 19A upper surface 19B lower surface 20A, 20B perforated hole 21A, 21B side surface 22A contact surface 23A screw portion 24A main valve seat member 27A sleeve member 28A main valve body 32A pilot valve seat member 33A lid member 36A pilot valve body 47 manifold P1 Supply flow path A1, B1 load flow path R1 discharge flow path

Claims (1)

(57) [Scope of request for utility model registration] 1. A supply flow path for supplying a pressure liquid, two load flow paths connected to a liquid actuator side, and a discharge flow connected to a low pressure side, on a manifold having a plurality of flow paths through which a liquid flows. The flow control is standardized on the upper and lower surfaces of the main body, the laminated control elements with through openings are selectively laminated, and an electromagnetic directional control valve is installed at the top of this laminated control element to form an operation control circuit. A stacked pressure control valve that constitutes one stacked control element of the stacked control device, wherein each flow path of the main body has a flow path for pressure control by opening on a side surface orthogonal to the upper and lower surfaces through which the flow path is opened. A communicating hole is provided in the main body, the hole is provided in a stepped shape, has a contact surface facing the opening side, and has a screw portion on the opening side from the contact surface. A main valve seat member for seating the main valve body with one end surface in contact with the contact surface; A sleeve member accommodated movably and sequentially yield instrumentation and a pilot valve seat member for seating the pilot valve body, a freely flow path flowing through the liquid than the flow path for the pressure control inside the respective members communicated formed, provided retractably by detachably screwed with the rotating operation of the lid member to accommodated movably the pilot valve body to wear the seat to the pilot valve seat member to the interior threaded portion of the drilled hole, Main valve seat member and pickpocket
The sleeve member and the pilot valve seat member are pressed against the contact surface of the drilled hole by tightening the lid member in the approach direction, and the sleeve member and the pilot valve seat member are connected to the main valve seat portion.
The members and the lid member are pressed against each other and each member is fixedly provided. The pressure contact portion of each member pressed against each other is formed on a flat surface so as to be liquid-tight by surface contact without providing a seal member. Laminated pressure control valve.