JP3377979B2 - Rotary switching valve device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary switching valve device having the function of a pressure holding valve. 2. Description of the Related Art Conventionally, as shown in FIG. 11, a rotary switching valve device D0 for operating a hydraulic cylinder 21 for raising and lowering an object W has been used. The rotary switching valve device D0 is, as shown in detail in FIGS. 12 to 19, a first state which is a neutral state in which the piston 22 of the hydraulic cylinder 21 is kept stopped, or a check valve C
In the second state, oil is supplied from an oil pump 23 to one internal space a of the hydraulic cylinder 21 via the oil pump 23, and oil in the other internal space b of the hydraulic cylinder 21 is returned to the oil tank 24, or the other state. Oil from the oil pump 23 into the internal space b of
It is formed so as to be in a third state in which the oil from the one internal space a is returned to the oil tank 24 via the on-off valve V. Next, each state of the rotary switching valve device D0 will be described in more detail with reference to FIGS. The rotary switching valve device D0 generally includes a manifold block M0, a rotary member R0, and an on-off valve V. The manifold block M0 includes a port A communicating with the internal space a, a port B communicating with the internal space b, a port P communicating with the oil pump 23, and the oil tank 2 described above.
It has a port T leading to 4. On the upper surface of the manifold block M0, two recesses 25, 26 are formed, and one of the recesses 25 communicates with the port B together with the first opening O1 on the bottom surface. The two openings O2, the third opening O3 communicating with the port P, and the fourth opening O4 communicating with the port T are formed along a circle at an angular interval of 90 degrees.
The first opening O1 can communicate with the port A via the check valve C0. That is, the check valve C0 is connected to the first opening O1.
, And between the port A and the port A, the port 27 is urged toward the point A 'by the spring 27 from the port A side, and the valve seat 28
Has a first valve body 29 pressed against the first opening O1, thereby allowing only the flow of the fluid from the first opening O1 toward the port A,
The fluid flow in the opposite direction is blocked. The manifold block M0 has a port T 'described later in addition to the ports described above, and this port T' communicates with the oil tank 24. [0005] The rotary member R0 is provided with the one recess 2
5 is rotatably fitted to the first lever L1 and rotated forward and backward within a predetermined angle range by the first lever L1. The rotary member R0 has a first through-hole H1, a second through-hole H2, and a third through-hole H3 which are bent in a U-shape with both ends opened at the bottom.
have. The on-off valve V is connected to the manifold block M0.
A second valve body 31 is provided in the other concave portion 26 on the upper surface of the above-mentioned and opposed to the above-described one concave portion 25, and is rotated by the second lever L2 to move up and down. This other recess 2
6 forms a part of the space from the space between the port A and the first valve body 29 to the above-described port T ′, and the second valve body 31 moves up and down, so that the port A and the first valve body 29 And the port T 'is in communication with the space 32 between them, or both are blocked. When the rotary switching valve device D0 is in the first state as shown in FIGS. 11 to 15, the third and fourth openings O3 and O4 are provided through the second through hole H2 of the rotary member R0. As a result, the port P and the port T communicate with each other, the second opening O2 communicating with the port B is closed, and the port A and the first opening O1 are reversed with respect to the flow of the fluid from the port A side. It is shut off by the stop valve C0, the first opening O1 is also closed, and the on-off valve V is in a closed state. Therefore, the oil in the internal spaces a and b is maintained as it is, and the oil from the oil pump 23 is supplied to the second through hole H2.
And returns directly to the oil tank 24, and the piston 22 does not move up and down. The state of the hydraulic circuit shown in FIG.
15 correspond to the states of the rotary switching valve device D0. Next, a rotary switching valve device D0 is shown in FIG.
As shown in FIG. 6, in the second state, the first and third openings O1 and O3 communicate with each other, and the second and fourth openings O2 and O4
Communicate with each other. As a result, with respect to the fluid sent from the port P, the port P communicates with the port A, and the port B communicates with the port T. Note that the on-off valve V is kept closed. Therefore, oil is sent from the oil pump 23 into the above-mentioned internal space a, the oil in the internal space b is returned to the oil tank 24, and the piston 22 rises. Note that the state of the hydraulic circuit shown in FIG. 16 is the rotary switching valve device D shown in FIG.
It corresponds to the state of 0. Finally, when the rotary switching valve device D0 is in the third state as shown in FIG. 18, the first and fourth openings O1 and O4 communicate with each other and the second and third openings O2 and O2. O
The port 3 communicates with the port P. As a result, the port P communicates with the port B. However, with respect to the flow of fluid from the port A side, the port A and the port T are shut off by the check valve C0. However, in this case, the opening / closing valve V is opened by the second lever L2, and the port A and the port T ′ are in communication. Accordingly, oil is supplied from the oil pump 23 into the above-mentioned internal space b, and the oil in the internal space a is returned to the oil tank 24 via the on-off valve V and the port T ', and the piston 22 descends. The state of the hydraulic circuit shown in FIG. 18 corresponds to the state of the rotary switching valve device D0 shown in FIG. In the case of the above-described conventional rotary type switching valve device D0, an on-off valve V is provided separately from the rotary member R0, and the above-mentioned first and second states are changed. In order to shift to the third state or to shift from the third state to another state, it is necessary to operate not only the first lever L1 but also the second lever L2. That is, when the third state is not relevant, only the first lever L1 is operated,
When the third state is involved, the first lever L1 and the second lever L2 must be operated, and there is a problem that the operation is complicated and erroneous operation is likely to occur. SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object thereof is to provide a rotary switching valve device which is easy to operate and does not cause erroneous operation. [0010] In order to solve the above-mentioned problems, the present invention has a port P and a port T which communicate with an oil pump, in addition to a port A and a port B. A first opening communicating with the port A, a second opening communicating with the port B, a third opening communicating with the port P, and a first communicating with the port T at least as far as the flow of the fluid toward the port A is concerned. A manifold block having four openings along one circle on one plane, and abutting on the manifold block at the position of the one plane, rotating about an axis passing through the center of the circle and perpendicular to the one plane It is provided so as to be able to communicate the third and fourth openings in the first state, and in the second state,
The first and third openings are communicated, and the second and third openings are connected.
Connect the fourth opening. In the third state, the first and fourth openings communicate with each other, and the rotary switching valve device includes a rotary member that communicates with the second and third openings. A valve body urged toward a valve seat located at one end of the space portion communicating with the first opening by an elastic member in the space portion communicating with A, and a lever integrally rotatably coupled to the rotary member. Along the axis, it is relatively movable with respect to the rotary member, when the rotary member is in the third state, is pushed down by the lever to separate the valve body from the valve seat, And a rod for setting the fourth state. Next, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 10 show a rotary switching valve device D1 according to the present invention. Parts corresponding to those shown in FIGS. In the rotary switching valve device D1, ports B, P, and T are provided on three sides of the manifold block M1, and a port A is provided at the center of the lower surface. A first opening O1, a second opening O2, a third opening O3, and a fourth opening O4 are provided on the upper surface of the manifold block M1 at an angular interval of 90 degrees along one circle. The first opening O1 is connected to the manifold block M
1 communicates with a through hole 1 drilled from the port A toward the upper surface of the manifold block M1 at the center of the valve 1 and a check valve C1 is provided in the through hole 1. This check valve C1
Has a valve element 4 urged by the spring 2 from the port A side and pressed against the valve seat 3 on the upper surface side, so as to allow the flow of fluid from the first opening O1 toward the port A. Has become. The second opening O2 communicates with the port B, the third opening O3 communicates with the port P, and the fourth opening O4 communicates with the port T. On the upper surface of the manifold block M, a casing 5 that rotatably accommodates a rotary member R1 is disposed. Further, a base plate 7 is provided on the cylindrical body 6 extending upward from the rotary member R1 and protruding from the upper surface of the casing 5 so as to be integrally rotatable therewith. The lower surface of the base plate 7 has first to
Recesses 10 are drilled at three positions corresponding to the third state, and a ball 9 constantly urged upward by a spring 8 on the upper part of the casing 5 is pressed against the opening edge of the recess 10. Have been. Thereby, when the base plate 7 is rotated, the positioning is loosely performed at a predetermined rotation angle. That is, in this state, the ball 9 is detached from the recess 10 by slightly increasing the force for rotating the base plate 7 so that the base plate 7 can be rotated. Further, by positioning the pin 11 protruding from the upper surface of the casing 5 in the recess 12 at the lower part of the base plate 7, the angle range of the forward / reverse rotation is restricted. A lever L is attached to the upper surface of the base plate 7 by a support shaft 13. The lever L is urged upward by a spring 14 disposed on the upper portion of the base plate 7, while the lower end surface 15 of the support shaft 13 on the side opposite to the spring 14 is brought into contact with the upper surface of the base plate 7, and the force of the spring 14 is applied. Further rotation is regulated. On the other hand, the rod 16 penetrates through the rotary member R1 from near the front surface of the valve body 4 in the through hole 1 in the manifold block M1, protrudes above the cylindrical body 6, and is fitted with the rod 16 so as to contact the lower surface of the lever L. Has been inserted. Then, by rotating the lever L around the axis of the rod 16, the rotary member R1 rotates while abutting on the upper surface of the manifold block M1 via the base plate 7 and the cylindrical body 6, and the lever L is rotated as shown in FIG. By pushing down the right end at the position, the valve body 4 is pushed down from the valve seat 3 via the rod 16, and the check valve C
Thus, the function of No. 1 is eliminated, and it is possible to make the check valve C1 substantially absent. The rotary member R1 has a first through-hole H1, a second through-hole H2 and a third through-hole H3 which are bent in a U-shape with both ends opened at the bottom. The second through hole H2 is formed so as to pass through a large-diameter space portion 17 surrounding a part of the rod 16 inside the rotary member R1. The rotary switching valve device D1 can be switched to any of the first to fourth states by rotating the rotary member R1 and moving the rod 16 up and down as described later. By the way, at the position of the large-diameter space portion 17, the rod 16 is divided into upper and lower portions. Next, each state of the rotary switching valve device D1 will be described. 1 to 5 show a first state, in which a third opening O3 and a fourth opening O3 are provided via a second through hole H2.
4, and the first opening O1 and the second opening O2 are in a closed state. In this state,
The rod 16 is not pushed down by the lever L. Therefore, only the oil flow from the port P to the port T is allowed, there is no oil flow from the port A and the port B, the rotary switching valve device D1 is in the neutral state, and the piston 22 of the hydraulic cylinder 21 is stopped. It is kept as it is. 6 and 7 show the second state, in which the first through hole H
1, the first opening O1 and the third opening O3 communicate with each other, and the second opening O2 and the fourth opening O4 communicate with each other via the third through hole H3. From the state. In this state, the rod 16 is not pushed down by the lever L. Therefore, the oil from the port P reaches the first opening O1, passes through the check valve C1, flows into the internal space a of the hydraulic cylinder 21 via the port A, and the oil in the internal space b of the hydraulic cylinder 21 The oil tank 24 passes through the third opening O3 via the port B, and from the port T via the third through hole H3.
Return to As a result, the piston 22 of the hydraulic cylinder 21 moves up. FIGS. 8 and 9 show a third state, in which the first opening O1 and the fourth opening O4 communicate with each other via the first through hole H1, and the second opening O2 via the third through hole H3. And the third opening O3 communicate with each other, while the second through hole H2 is out of any opening. In this state, the rod 16 is not pushed down by the lever L. Therefore, the port P communicates with the internal space b of the hydraulic cylinder 21 via the third opening O3, the third through hole H3, the second opening O2, and the port B, while the first opening O1 is connected to the first through hole H1, It communicates with the oil tank 24 via the fourth opening O4 and the port T. However, the port A communicating with the internal space a of the hydraulic cylinder 21 and the first opening O1
The flow of oil from the port A to the first opening O1 is blocked because the check valve C1 is interposed therebetween. Therefore, in this third state, the hydraulic pressure acts on the internal space b of the hydraulic cylinder 21, but the oil in the internal space a does not flow out, so that the piston 22 of the hydraulic cylinder 21 remains stopped. FIG. 10 shows a fourth state in which the rod 16 is lowered by pushing down the lever L in the rotating state of the rotary member R1 shown in FIG.
3 shows a state when the valve body 4 is pushed down and separated from the valve seat 3. In this case, the check valve C1 does not perform its function, and the check valve C1 substantially disappears,
Oil from the internal space a of the hydraulic cylinder 21 flows through the port A to the first opening O1, and the oil is returned to the oil tank 24 via the first through hole H1 and the port T. On the other hand, from the port P, the third opening O3 and the third through hole H
3. The flow path to the internal space a of the hydraulic cylinder 21 via the second opening O2 and the port B is the same as in the third state described above. Therefore, in this case, the piston 22 of the hydraulic cylinder 21 is lowered by the hydraulic pressure. Then, in order to maintain the piston 22 at the lowered position as appropriate, the lever L is lifted, and the depression of the valve body 4 by the rod 16 is released to return the check valve C1 to the functioning state. May be set. Also,
If it is desired to raise the piston 22 again, the above-described second state may be set. In any of these cases, the operation is performed by operating only the lever L. As is apparent from the above description, according to the present invention, in addition to the port A and the port B, a port P communicating with the oil pump and a port T communicating with the oil tank are provided. A first opening communicating with the port A, a second opening communicating with the port B, a third opening communicating with the port P, and a fourth communicating with the port T as far as the flow of the fluid toward the port A is concerned. A manifold block having an opening along one circle on one plane, and abutting on the manifold block at the position of the one plane, passing through the center of the circle and rotatable about an axis perpendicular to the one plane. In the first state, the third and fourth openings communicate with each other. In the second state, the first and third openings communicate with each other, and the second and fourth openings communicate with each other. Let through. In the third state, the first and fourth openings communicate with each other, and the rotary switching valve device includes a rotary member that communicates with the second and third openings. A valve body urged toward a valve seat located at one end of the space portion communicating with the first opening by an elastic member in the space portion communicating with A, and a lever integrally rotatably coupled to the rotary member. ,
Along the axis, it is relatively movable with respect to the rotary member, and when the rotary member is in the third state, it is depressed by the lever to separate the valve body from the valve seat. And a rod for setting the state as described above. Therefore, it is possible to switch the rotary valve device to each state by operating only one lever, which simplifies the operation and
This has the effect of eliminating erroneous operations.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first state of a rotary switching valve device according to the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is an exploded perspective view showing a part of the rotary switching valve device shown in FIG. 1; FIG. 5 is a hydraulic circuit diagram when the rotary switching valve device shown in FIG. 1 is in a first state. 6 is a cross-sectional view corresponding to FIG. 3 when the rotary switching valve device shown in FIG. 1 is in a second state. FIG. 7 is a hydraulic circuit diagram when the rotary switching valve device shown in FIG. 1 is in a second state. 8 is a cross-sectional view corresponding to FIG. 3 when the rotary switching valve device shown in FIG. 1 is in a third state. 9 is a hydraulic circuit diagram when the rotary switching valve device shown in FIG. 1 is in a third state. FIG. 10 is a hydraulic circuit diagram when the rotary switching valve device shown in FIG. 1 is in a fourth state. FIG. 11 is a diagram showing a hydraulic circuit when a conventional rotary switching valve device applied to an elevating device is in a first state. FIG. 12 is a sectional view of the rotary switching valve device shown in FIG. 11; FIG. 13 is a sectional view taken along line XIII-XIII of FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 15 is an exploded perspective view showing a part of the rotary switching valve device shown in FIG. 16 is a sectional view corresponding to FIG. 13 when the rotary switching valve device shown in FIG. 12 is in a second state. 17 is a hydraulic circuit diagram when the rotary switching valve device shown in FIG. 12 is in a second state. 18 is a sectional view corresponding to FIG. 13 when the rotary switching valve device shown in FIG. 12 is in a third state. 19 is a hydraulic circuit diagram when the rotary switching valve device shown in FIG. 12 is in a third state. [Description of Signs] 1 Through hole 2 Spring 3 Valve seat 4 Valve body 16 Rod D1 Rotary switching valve device A, B, P, T Port C1 Check valve L Lever M1 Manifold block R1 Rotary member O1 First opening O2 First Double opening O3 Third opening O4 Fourth opening

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 11/074 F15B 11/00-11/24 F16K 3/04 F16K 31/44

Claims (1)

(57) [Claim 1] In addition to port A and port B, it has a port P communicating with an oil pump and a port T communicating with an oil tank. As long as possible, the first opening communicating with the port A, the second opening communicating with the port B, the third opening communicating with the port P, and the fourth opening communicating with the port T are one circle on one plane. And a manifold block having a position along the one plane, which abuts the manifold block at a position on the one plane, is provided so as to be rotatable about an axis perpendicular to the one plane through the center of the circle, and in the first state The third and fourth openings are communicated with each other, and in the second state,
The first and third openings are communicated, and the second and third openings are connected.
Connect the fourth opening. In the third state, the first and fourth openings communicate with each other, and the rotary switching valve device includes a rotary member that communicates with the second and third openings. A valve body urged toward a valve seat located at one end of the space portion communicating with the first opening by an elastic member in the space portion communicating with A, and a lever integrally rotatably coupled to the rotary member. Along the axis, it is relatively movable with respect to the rotary member, when the rotary member is in the third state, is pushed down by the lever to separate the valve body from the valve seat, A rotary switching valve device comprising: a rod for setting a fourth state.