JPH08296749A - Hydraulic valve - Google Patents

Abstract

PURPOSE: To provide a hydraulic valve which enables the continuity and break of two sets of passages at the same time. CONSTITUTION: A valve casing 3 is made by uniting right and left first and second casings 5 and 6, and inside the valve casing 3 is arranged one valve shaft 4, in which two valve bodies 41 and 42 are made at a certain interval, and the first passage 32 which connects a water suction port 53 with a water discharge port 54 through a valve port 52, is made in the first casing 5. Furthermore, the second passage 32, which connects a water suction port 63 with a water discharge port 64 through a valve port 62, is made in the second casing 6, and by the sliding of a common valve shaft 4, the first and second passages 31 and 32 are so constituted as to be capable of being connected or broken at the same time.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hydraulic valve.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a hydraulic pump 200 and a hydraulic cylinder 100 are connected to a water source (not shown).
The one-side chamber 110 and the one-side chamber 110 are connected by a water pipe 310,
There is a hydraulic circuit in which the other side chamber 120 of the hydraulic cylinder 100 and the water tank 400 are connected by a drain pipe 320.

In order to operate the hydraulic cylinder 100, opening / closing valves 510 and 520 are provided in the middle of each of the water supply pipe 310 and the drain pipe 320, and two opening / closing valves 510 and 520 are provided.
I was opening and closing 520 at the same time. 130 is a piston rod.

However, in order to open and close both valves 510 and 520 at the same time, two opening and closing drive means are required, and it is controllable and costly to drive different opening and closing valves 510 and 520 for one operation of one hydraulic cylinder 100. It is disadvantageous in terms of aspect. Therefore, as shown in FIG.
With 600, it was considered to open and close two flow paths (water pipe 310 and drain pipe 320) at the same time.

[0005]

However, in order to simultaneously open and close two flow passages with one valve 600, two independent flow passages are required inside the valve casing, and the valve 600 is used in a hydraulic circuit. When used inside, there is a risk of malfunction due to water pressure, so a structure must be provided to prevent this, which complicates the structure of the valve casing. Therefore, there is a problem that the manufacturing cost of the valve 600 becomes high.

It is an object of the present invention to provide a hydraulic valve structure which can solve the above problems.

[0007]

According to the present invention, the left and right first and second casings are integrally formed to form a valve casing, and two valve bodies are formed in the valve casing at regular intervals. A single valve shaft is slidably arranged, and a first flow path that connects the water inlet port and the water discharge port through the valve hole is formed in the first casing, while the second casing is provided with the valve hole. A second flow path that connects the water inlet port and the water discharge port is formed via, and the first and second flow paths can be simultaneously opened and closed by sliding the shared valve shaft. The present invention relates to a water pressure valve.

[0008]

In the present invention, the left and right first and second casings are integrally formed to form a valve casing, and a single valve shaft in which two valve bodies are formed at regular intervals is formed in the valve casing. Arranged slidably, in the first casing,
While forming a first flow path that communicates the water inlet port and the water discharge port through the valve hole, the second casing, forming a second flow path that communicates the water inlet port and the water discharge port through the valve hole, By sliding the shared valve shaft, the first and second flow paths can be connected and disconnected at the same time.Therefore, by connecting to an actuator such as a hydraulic cylinder, it is possible to The two channels can be opened and closed at the same time.

[0009]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is an explanatory view of a hydraulic valve according to the present invention,
FIG. 2 is a hydraulic circuit diagram in which the hydraulic valve is arranged.

In this embodiment, as shown in FIG. 2, two hydraulic valves V are connected to a hydraulic pump P and a double-acting hydraulic cylinder 11
Is intervened between.

First, the construction of the hydraulic valve V will be described with reference to FIG.

In the hydraulic valve V, the left and right first and second casings 5 and 6 are integrally formed to form a valve casing 3, and two valve bodies 41 and 42 are provided in the valve casing 3 at regular intervals. One of the valve shafts 4 is formed so as to be slidable, and the first casing 5 is formed with a first flow path 31 that connects the water inlet port 53 and the water outlet port 54 through the valve hole 52. The second casing 6 is formed with a second flow path 32 that communicates the water inlet port 63 and the water outlet port 64 via the valve hole 62, and the first and second second shafts 4 are shared by sliding the valve shaft 4. Channel
The feature is that 31,32 can be connected and disconnected at the same time.

The first and second flow paths 31 and 32 are located in the middle of the working water flow path that connects the hydraulic pump P of the hydraulic circuit 14 and the hydraulic cylinder 11 shown in FIG. In the case of activating, the hydraulic water pumped from the hydraulic pump P reaches the hydraulic cylinder 11 through the first flow passage 31, and the hydraulic water returns from the hydraulic cylinder 11 to the tank T through the second flow passage 32. It has a flowing structure.

As shown in FIG. 1, the valve casing 3 is
Is a first casing 5 having openings at both ends formed separately.
And a second casing 6, which are integrally connected in the sliding direction of the valve shaft 4 so as to share one valve shaft 4.

Further, in each of the casings 5 and 6, valve holes 52 and 62 having valve seats 51 and 61 are formed on the periphery, respectively, and water inlet ports 53 and 63 which can communicate with each other through the valve holes 52 and 62. The water discharge ports 54 and 64 are formed respectively.

Further, the valve lid 7 having the stroke space Q of the valve shaft 4 is attached to the distal end opening of the second casing 6 on the distal end side of the valve shaft 4, while the first casing 5 and the second casing 6 are provided. Each base end opening and the valve shaft 4 are connected to an O-ring.
By sealing in a watertight manner via the seal portion composed of 33 and 34, the first and second flow paths 31 and 32 can be partitioned and formed, respectively.

That is, the first channel 31 is formed between the water inlet port 53 and the water outlet port 54 of the first casing 5, and the second channel 32 is the water inlet port 63 and the water outlet port 64 of the second casing 6.
Formed between and.

Reference numeral 35 denotes an O-ring provided between the first casing 5 and the second casing 6, and a bearing portion protruding from the end of the second casing 6 on the side of connection with the first casing 5. It is arranged in an annular groove formed in 55. Also 36
Is an O-ring provided between the second casing 6 and the lid 7, and 37 is a connecting bolt for integrally connecting the casings 5, 6 and the lid 7.

On the other hand, the valve shaft 4 has a ring-shaped valve body 41 which comes into contact with and separates from a valve seat 51 of a valve hole 52 formed in the first casing 5.
A valve element 43 formed at the tip portion, and a valve element 44 formed at the tip portion with a ring-shaped valve element 42 that comes into contact with and separates from a valve seat 61 of a valve hole 62 formed in the second casing 6, It can be divided into connecting shafts 45 and 46 that connect with the respective valves 43 and 44.

Then, a projecting portion which can be fitted to the ring-shaped valve bodies 41 and 42 is formed on one end side of both connecting shafts 45 and 46, and the projecting portions are fitted to the valve bodies 41 and 42. , The valve elements 43, 44 and the connecting shafts 45, 46 are respectively connected by bolts 47, 47 with holes to form the split valve shafts 4a, 4b, and the split valve shafts 4a, 4b are axially connected to each other. To form a valve shaft 4.

That is, the valve shaft 4 includes the connecting shafts 45 and 46 and the valve element.
43 and 44 are connected alternately.

By inserting the valve shaft 4 into the valve casing 3 slidably and reciprocatingly sliding it within the stroke space Q, the two valve holes 52 and 62 can be opened and closed at the same time. .

At this time, since the amount of movement of the valve shaft 4 in the stroke space Q is large, the valve holes 52 and 62 are largely opened, so that the working water pumped from the hydraulic pump P contains dust and the like. Also, there is no risk of clogging in the water pressure valve V, and smooth flow can be achieved.

The valve bodies 41, 42 are constructed by mounting packings 41a, 42a, which directly abut the toilet seats 51, 61, on packing mounting portions 41b, 42b having a diameter larger than that of the valve body. A washer 9 is provided on the packing 41a on the one casing 5 side to enhance the rigidity of the packing 41a.

By the way, in the above structure, the water pressure of the working water flowing back from the water pressure cylinder 11 is always applied to the water inlet port 63 of the second casing 6. Therefore, when the valve is closed, the valve body 42 that blocks the second flow path 32 is closed.
If water pressure is applied to the valve, it may malfunction and open the valve.

Therefore, the hole bolt 47 is provided with a water passage hole 47a penetrating the bolt body in the axial direction, and the connecting shafts 45 and 46 are screwed with the hole bolts 47 and 47. Female screw holes 45a, 46a are provided, and further communication holes 45b, 46b for communicating the bottom of the female screw holes 45a, 46a with the outside of the connecting shafts 45, 46 are provided.

With this configuration, the split valve shaft 4b located on the second casing 6 side has the water inlet port 63 → the communication hole 46b →
Female screw hole 46a → water passage hole 47a → a stroke space Q and a flow path for the working water are formed, and the working water flows into the stroke space Q from the water inlet port 63, and back pressure is applied to the valve shaft 4. You can do it.

Therefore, a hydraulic cylinder is attached to the water inlet port 63.
Even if the hydraulic pressure of the working water flowing back from 11 acts on the valve element 42 in the opening direction, it is canceled by the back pressure and a malfunction can be prevented.

Further, an adjusting bolt 8 for adjusting the valve operating position is screwed on the end surface of the connecting shaft 45 located on the first casing 5 side, which projects outward. For this purpose, the connecting shafts 45, 46 are provided with adjusting bolt screwing holes 45c, 46c on the opposite side of the female screw holes 45a, 46a. Reference numeral 8a is an adjusting nut corresponding to the adjusting bolt 8.

Through the adjusting bolt 8, the water pressure valve V
If the spools 20 are continuously provided, the operating position can be adjusted even if the position of the water pressure valve V is changed.

Next, the hydraulic circuit 14 shown in FIG. 2 will be described, and further the case of operating the hydraulic cylinder 11 will be described.

As shown in FIG. 2, the water pressure circuit 14 is connected to a water pressure pump P which is connected to a water source (not shown) so as to supply water to the main pipe 71.
The two ends are connected to each other and the tip of the main water supply pipe 71 is bifurcated into a left side water supply branch pipe 72 and a right side water supply branch pipe 73.

That is, the left side water supply branch pipe 72 is composed of a left side upstream pipe 74 and a left side downstream pipe 75, and the end of the left side upstream pipe 74 is connected to the water inlet port 53 of the first casing 5 of the left side water pressure valve V, The start end of the left downstream pipe 75 is connected to the water discharge port 54 of the first casing 5, and the end thereof is connected to the right chamber 77 formed in the cylinder body 11a of the hydraulic cylinder 11.

From the left side chamber 76, the left side upstream drain pipe 78
Is extended, and its end is connected to the water inlet port 63 of the second casing 6 of the left hydraulic valve V so as to communicate therewith.
The water discharge port 64 and the left side working water tank T of the left side downstream pipe
I am communicating with 79.

On the other hand, the right side water supply branch pipe 73 is connected to the right side upstream pipe 80.
And a right downstream pipe 81, the end of the right upstream pipe 80 is connected to the water inlet port 53 of the first casing 5 of the right hydraulic valve V, and the start end of the right downstream pipe 81 is connected to the water discharge port 54 of the first casing 5. In addition to being communicatively coupled, the end thereof is communicatively coupled to the left chamber 76 formed in the cylinder body 11a of the hydraulic cylinder 11.

From the right side chamber 77, the right side upstream drain pipe 82
Extends and connects the end thereof to the water inlet port 63 of the second casing 6 of the right hydraulic valve V so as to communicate therewith.
The water discharge port 64 and the right side working water tank T to the left side downstream piping
I am communicating with 83.

In the hydraulic circuit 14 described above, for example, when the piston rod 11b of the hydraulic cylinder 11 is extended to the left, the spool 20 of the left hydraulic valve V is pushed.

When the spool 20 is pushed, the valve shaft 4 of the left hydraulic valve V is pushed, and the left hydraulic valve V opens the first and second flow passages 31 and 32 at substantially the same time (see FIG. 1). The working water pumped from the pump P flows into the right chamber 77 of the cylinder body 11a, and the piston rod 11b can be extended to the left.

At this time, the right hydraulic valve V is maintained in the closed state, and when the working water flows into the right chamber 77 of the cylinder body 11a, it flows backward from the left chamber 76 through the right downstream pipe 81. Acts on the valve body 41 from the water discharge port 54 of the first casing 5 of the right side water pressure valve V, and applies pressure in the opening direction to the valve body 41, but the valve body 41 causes the water pressure via the right side water supply branch pipe 73. The pressure from the pump P is received in the valve closing direction, and as described above, the valve body 41 has the packing 41a mounted on the packing mounting portion 41b having a diameter larger than that of the valve body. Since the area of the portion 41b is larger than the difference between the area of the valve hole 52 and the cross-sectional area of the valve shaft 4, the force in the valve closing direction becomes large and there is no possibility of opening the valve.

On the other hand, the piston rod 11 of the hydraulic cylinder 11
When b is extended to the right, the action opposite to the above is performed and piston rod 11b can be extended to the right.

As described above, the hydraulic valve V according to the present invention operates to open and close the first and second flow passages 31 and 32 at the same time, but there is no risk of malfunction due to water pressure, and the valve is opened and closed. Easy and accurate control.

Further, since the valve casing 3 and the valve shaft 4 are constructed by assembling a plurality of common parts, the structure is simple and the manufacturing cost can be greatly reduced.

[0044]

The present invention has the following effects.

The left and right first and second casings are integrally formed to form a valve casing, and one valve shaft having two valve bodies formed at a predetermined interval is slidable in the valve casing. The first casing is provided with a first flow path that communicates the water inlet port and the water outlet port through the valve hole, while the second casing is provided with the water inlet port and the water outlet port through the valve hole. Since the communicating second flow path is formed, it is possible to simultaneously open and close the first and second flow paths by sliding the shared valve shaft, and the valve opening / closing control can be performed easily and accurately.

Further, since the valve casing can be constructed by assembling the first and second casings, the structure is simplified,
The manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a hydraulic valve according to the present invention.

FIG. 2 is a hydraulic circuit diagram of the hydraulic valve.

FIG. 3 is a hydraulic circuit diagram including a conventional on-off valve.

FIG. 4 is a hydraulic circuit diagram including a conventional opening / closing valve.

[Explanation of symbols]

 V Water pressure valve 3 Valve casing 4 Valve shaft 5 First casing 6 Second casing 31 First passage 32 Second passage 41 Valve body 42 Valve body 52 Valve hole 53 Water inlet port 54 Water discharge port 62 Valve hole 63 Water inlet port 64 Water outlet port

Claims (1)

[Claims] 1. The left and right first and second casings (5), (6) are integrally formed to form a valve casing (3), and two valve casings (3) are provided at regular intervals. Disc (4
One valve shaft (4) formed with (1) and (42) is slidably arranged, and a water inlet port (53) and a water discharge port are provided in the first casing (5) through a valve hole (52). First flow path (31) communicating with port (54)
Meanwhile, the second casing (6) has a valve hole (62).
A second flow path (32) that communicates the water inlet port (63) and the water discharge port (64) via the first flow path (32) is formed by sliding the shared valve shaft (4). A hydraulic valve characterized in that 31) and (32) can be connected and disconnected simultaneously.