JP3725990B2 - Control valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention can be applied to a machine tool configured to operate a plurality of hydraulic actuators such as a hydraulic cylinder for moving a chuck and a hydraulic cylinder for moving a loader with a single hydraulic pressure source. The present invention relates to a control valve device that is employed to accurately operate only one hydraulic actuator required among a plurality of hydraulic actuators during maintenance of a machine tool.
[0002]
[Prior art]
A hydraulic circuit diagram of a machine tool configured such that a hydraulic cylinder 30 for moving a chuck (not shown) and a hydraulic cylinder 31 for moving a loader (not shown) are operated by a single hydraulic pressure source 32 has been conventionally shown in FIG. This is configured as shown in FIG. In this hydraulic circuit, the operation of the hydraulic cylinder 30 is individually controlled by the operation of the electromagnetic switching valve 33, and the operation of the hydraulic cylinder 31 is individually controlled (can be switched) by the operation of the electromagnetic switching valve 34. It has a configuration.
[0003]
At the time of maintenance, for example, when a centering operation is performed by moving the loader with the hydraulic cylinder 31, the switching valve 33 that controls the operation of the hydraulic cylinder 30 maintains the switching position in the illustrated state, and the hydraulic cylinder 30 is illustrated. It stops at one end to prevent the chuck from moving.
[0004]
[Problems to be solved by the invention]
However, the fluid pressure source 32 is in an operating state (a state in which fluid pressure can be supplied) in order to operate the fluid pressure cylinder 31 even during maintenance. The hydraulic cylinder 30 that was stopped at the time of operation moved to move the chuck, and further safety was required.
[0005]
[Means for Solving the Problems]
The present invention has been made to meet the above demands, and as illustrated in FIG. 1, supply flow paths P and P1 connected to the hydraulic pressure source 32 and a discharge flow path connected to the low pressure side (tank T). The hydraulic actuator (hydraulic cylinder 31) is operated by switching the communication between R and R1 and the two load flow paths A and B connected to the hydraulic actuator (hydraulic cylinder 31) by the switching valve 34. In the hydraulic circuit, the connection flow paths A1 and B1 that can be connected to the load flow paths A and B separately from the hydraulic pressure source 32 to connect the hydraulic unit 35 are provided. A check valve V1 that allows flow to the switching valve 34 side and prevents flow to the hydraulic pressure source 32 side is provided at P1, and a stop valve V2 that can switch between a relief function and an opening function is provided to the discharge flow paths R and R1. The control valve device V is provided It is characterized in.
[0006]
In this case, both the load flow channel, the both connection flow channel, the supply flow channel, and the discharge flow channel are provided in a valve body, the check valve is disposed in the valve body, and the supply flow channel in the valve body. And a check valve body that allows the flow to the switching valve side and blocks the flow to the hydraulic pressure source side, and the stop valve includes the valve body and the valve body. In the state where it is provided in the discharge flow path and is spring-biased toward the valve seat and seated on the valve seat by the spring force, it flows away from the valve seat against the spring force at the set pressure and flows to the low pressure side And a relief valve body that engages with the back portion of the relief valve body at a first position where the relief valve body is assembled to the valve body so as to freely advance and retract, and retracts from the valve body. The second seat is separated from the valve seat against a spring force and enters the valve body at the second position. It is desirable to provide an operation member that is separated from the leaf valve body and seats the relief valve body on the valve seat with a spring force, and the valve is respectively provided at the first position and the second position on the operation member. It is desirable to provide a setting unit that is in contact with the main body and sets the position of the first position and the second position.
[0007]
[Operation and effect of the invention]
In a hydraulic circuit of a machine tool that employs the control valve device V according to the present invention (the invention according to claim 1), when operating normally, the hydraulic pressure source 32 is in an operating state (a state in which pressure liquid can be supplied). The connection flow path A1, B1 connected to the hydraulic unit 35 is closed, and the stop valve V2 is switched to the open function state (first position). When the load flow path B is communicated with the discharge flow path R through the path P, the pressure liquid flowing from the hydraulic pressure source 32 to the supply flow path P1 flows to the load flow path A through the check valve V1 and flows into the hydraulic pressure actuator ( Supplied to the hydraulic cylinder 31), the liquid in the hydraulic actuator (hydraulic cylinder 31) flows to the discharge flow path R through the load flow path B, and flows to the discharge flow path R1 through the stop valve V2 in the open function state. Discharged to the low pressure side (tank T), Pressure actuator (hydraulic cylinder 31) is actuated in one direction.
[0008]
When the load passage B is connected to the supply passage P and the load passage A is connected to the discharge passage R by the switching valve 34, the pressure liquid flowing from the fluid pressure source 32 to the supply passage P1 becomes the check valve V1. Through the load flow path B and supplied to the hydraulic actuator (hydraulic cylinder 31), the liquid in the hydraulic actuator (hydraulic cylinder 31) flows through the load flow path A to the discharge flow path R and is in an open function state. After passing through the stop valve V2, it flows into the discharge passage R1 and is discharged to the low pressure side (tank T), whereby the hydraulic actuator (hydraulic cylinder 31) operates in the other direction opposite to that described above.
[0009]
By the way, when the hydraulic actuator (hydraulic cylinder 31) is operated during the maintenance of the machine tool, the hydraulic pressure source 32 is set to the operation stop state (the pressure liquid cannot be supplied), and the hydraulic pressures of the connection flow paths A1 and B1 are set. A hydraulic unit 35 that supplies pressure liquid is connected to the connection part with the unit 35 separately from the hydraulic pressure source 32, and the hydraulic valve 35 is switched from the hydraulic unit 35 to the relief function state (second position). supplying pressure liquid connection channel A1, the pressure fluid is supplied to the hydraulic actuators flows through the load channel a (hydraulic cylinders 31), the liquid in the hydraulic actuator (hydraulic cylinder 31) is the load current It flows through the path B and the connection flow path B1 and is discharged to the low pressure side (tank) of the hydraulic unit 35, whereby the hydraulic actuator (hydraulic cylinder 31) operates in one direction.
[0010]
Further, when the pressure liquid is supplied from the hydraulic unit 35 to the connection flow path B1, the pressure liquid flows through the load flow path B and is supplied to the hydraulic actuator (hydraulic cylinder 31), and in the hydraulic actuator (hydraulic cylinder 31). The liquid flows through the load flow path A and the connection flow path A1, and is discharged to the low pressure side (tank) of the hydraulic unit 35, whereby the hydraulic actuator (hydraulic cylinder 31) operates in the other direction.
[0011]
During the maintenance described above, one of the two load channels A and B communicates with the supply channels P and P1 and the other communicates with the discharge channels R and R1 via the switching valve 34. In the supply flow paths P and P1, the check valve V1 blocks the flow of the pressure liquid toward the hydraulic pressure source 32, and in the discharge flow paths R and R1, the stop valve V2 has a relief function on the low pressure side (tank T ) Restrict the flow of pressure liquid to. For this reason, the pressure liquid from the hydraulic unit 35 is supplied only to one required hydraulic actuator (hydraulic cylinder 31) and not to other hydraulic actuators (hydraulic cylinder 30). Therefore, the hydraulic actuator (hydraulic cylinder 30) that is not required at the time of maintenance of the machine tool can be reliably stopped, and safety can be further improved.
[0012]
In the control valve device according to the present invention, since the stop valve V2 can be switched between the relief function and the release function, when the maintenance of the machine tool is completed and returned to the normal state, the operator can release the stop valve V2. Even if it is forgotten to return from the state to the open function state, the stop valve V2 opens because the pressure of the liquid flowing from the hydraulic actuator (hydraulic cylinder 31) to the discharge flow path R through the switching valve 34 becomes the relief set pressure. The pressure fluid is discharged to the low pressure side (tank T). Therefore, the hydraulic actuator (hydraulic cylinder 31) can be operated in a state where an excessive increase in pressure is suppressed.
[0013]
Further, in the control valve device (the invention according to claim 1), the load passage, the connection passage, the supply passage, and the discharge passage are provided in a valve body, and the check valve is provided. The stop body is provided with the valve body and a check valve body that is provided in a supply flow path in the valve body and allows flow to the switching valve side and blocks flow to the hydraulic pressure source side, and the stop In a state where the valve is provided in the valve body and the discharge passage in the valve body and is spring-biased toward the valve seat and seated on the valve seat by the spring force, the valve resists the spring force at the set pressure. A relief valve body that is separated from the valve seat and allows a flow to the low pressure side, and is assembled to the valve body so as to be movable forward and backward, and the relief valve body is in a first position where the relief valve body retreats from the valve body. And the relief valve body is separated from the valve seat against the spring force. In the case of a configuration including an operation member that is separated from the relief valve body at the second position to enter the valve body and seats the relief valve body on the valve seat with a spring force (in the case of the invention according to claim 2) ), In addition to the above-described operational effects (the operational effects of the invention according to claim 1), the valve body can be shared as a flow path forming member, a check valve constituent member, and a stop valve constituent member. The effect that a valve apparatus can be comprised compactly can also be acquired. In addition, since the stop valve is configured to include a valve body, a relief valve element, and an operation member, compared to the case where a relief valve and an opening / closing switching valve are connected in parallel to configure a stop valve that can switch between a relief function and an opening function. The stop valve can be configured simply and compactly.
[0014]
In the control valve device (the invention according to claim 2), the first and second positions are set by contacting the operation member at the first position and the second position, respectively. When the setting portion is provided (in the case of the invention according to claim 3), in addition to the above-described operation effect (operation effect of the invention according to claim 2), the operator moves the operation member from the second position to the first position. In the case of performing the retreat operation to the position, when the operating member reaches the first position, the setting unit abuts the valve main body, and the further retreat operation can be disabled, and the entry operation is performed from the first position to the second position. When the operating member reaches the second position, the setting portion abuts against the valve main body and further entry operation can be disabled, and the operating member can be accurately moved to the first position and the second position by simple operation. Can be positioned.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show a first embodiment of the present invention. In this embodiment, the operation of the hydraulic cylinder 30 can be switched by an electromagnetic switching valve 33 and the operation of the hydraulic cylinder 31 is electromagnetic. The switching valve 34 can be switched by a type switching valve 34, and the switching valve 34 is stacked on the control valve device V according to the present invention.
[0016]
The control valve device V is connected to each of two load flow paths A and B connecting the hydraulic cylinder 31 and the switching valve 34, and a portable hydraulic unit 35 can be connected through a quick joint C with a self seal. It has connection flow paths A1 and B1, and is interposed in supply flow paths P and P1 that connect the switching valve 34 and the hydraulic pressure source 32 to allow flow to the switching valve 34 side and flow to the hydraulic pressure source 32 side. And a stop valve V2 that is interposed in discharge passages R and R1 connecting the switching valve 34 and the tank T (low pressure side) and can manually switch between the relief function and the release function. Yes.
[0017]
The load channels A and B, the connection channels A1 and B1, the supply channels P and P1, and the discharge channels R and R1 are schematically shown in FIG. 1 and shown in detail in FIGS. A check valve V <b> 1 and a stop valve V <b> 2 are integrally assembled with the valve body 11. As shown in detail in FIGS. 2 and 3, the check valve V <b> 1 includes the valve body 11, the valve seat 12 provided between the supply passages P and P <b> 1 in the valve body 11, and the supply passage P , P1 and a check valve body 14 that allows flow to the switching valve 34 side and prevents flow to the hydraulic pressure source 32 side, and has a cracking pressure of about 0.005 MPa, for example. Has been.
[0018]
As shown in detail in FIGS. 2, 4 and 5, the stop valve V <b> 2 includes the valve body 11, the valve seat 15 provided between the discharge flow paths R and R <b> 1 in the valve body 11, and the valve body 11. The spring force is applied at a set pressure (for example, a cracking pressure of about 6 MPa) in a state in which the valve seat 15 is urged by the spring 16 and is seated on the valve seat 15 by the spring force. And a relief valve body 17 that is separated from the valve seat 15 to allow the flow to the low pressure side, and is assembled to the valve body 11 via an O-ring so that the valve body 11 can be moved forward and backward by rotation. At the first position (the position shown in FIG. 4) where the relief valve body 17 is retracted, the relief valve body 17 is engaged with the back portion of the relief valve body 17 (opposite the head seated on the valve seat 15) to resist the spring force. The second position is to move away from the valve seat 15 and enter the valve body 11 And an operation member 18 for seating the same relief valve body 17 disengaged with the relief valve body 17 at (position shown in FIG. 5) on the valve seat 15 by the spring force.
[0019]
The operation member 18 includes an annular setting portion 18a that abuts against the valve body 11 at the first position shown in FIG. 4 and the second position shown in FIG. 5 to set the first position and the second position, respectively. A hexagonal hole 18b is provided at the center of the hexagonal hole 18b at the center of the hexagonal hole 18b. For this reason, the operation member 18 cannot be moved back and forth unless it is a dedicated tool (not shown) that is not a normal hexagon wrench.
[0020]
In the present embodiment configured as described above, when a normal operation is performed, the hydraulic pressure source 32 is set in an operating state (a state in which pressure liquid can be supplied), and connected to the hydraulic unit 35 in the connection flow paths A1 and B1. 4 is closed with a self-sealing quick joint C and the stop valve V2 is switched to the open function state (first position) shown in FIG. In addition, when the load channel B communicates with the discharge channel R, the pressure liquid flowing from the hydraulic pressure source 32 to the supply channel P1 flows to the load channel A via the check valve V1 and is supplied to the hydraulic cylinder 31. Then, the liquid in the hydraulic cylinder 31 flows to the discharge flow path R through the load flow path B, flows to the discharge flow path R1 through the stop valve V2 in the open function state, and is discharged to the tank T. Operates in one direction.
[0021]
When the load passage B is connected to the supply passage P and the load passage A is connected to the discharge passage R by the switching valve 34, the pressure liquid flowing from the fluid pressure source 32 to the supply passage P1 becomes the check valve V1. Through the load flow path B and supplied to the hydraulic cylinder 31, and the liquid in the hydraulic cylinder 31 flows through the load flow path A to the discharge flow path R and through the stop valve V2 in the open function state to the discharge flow path R1. The hydraulic cylinder 31 is operated in the other direction opposite to that described above.
[0022]
By the way, when the hydraulic cylinder 31 is operated during the maintenance of the machine tool, the hydraulic pressure source 32 is brought into an operation stop state (a state in which pressure liquid cannot be supplied) and connected to the hydraulic unit 35 in the connection flow paths A1 and B1. In the state where the hydraulic unit 35 is connected to the part via the quick coupling C and the stop valve V2 is switched to the relief function state (second position) shown in FIG. 5, the pressure liquid is supplied from the hydraulic unit 35 to the connection flow path A1. Is supplied (performed by a switching operation of the switching valve 35a provided in the hydraulic unit 35), the pressure liquid flows through the load flow path A and is supplied to the hydraulic cylinder 31, and the liquid in the hydraulic cylinder 31 flows to the load flow path. B flows through the connection flow path B1 and is discharged to the low pressure side (tank) of the hydraulic unit 35, whereby the hydraulic cylinder 31 operates in one direction.
[0023]
When the pressure liquid is supplied from the hydraulic unit 35 to the connection flow path B1, the pressure liquid flows through the load flow path B and is supplied to the hydraulic cylinder 31, and the liquid in the hydraulic cylinder 31 is connected to the load flow path A. The fluid flows through the path A1 and is discharged to the low pressure side (tank) of the hydraulic unit 35, whereby the hydraulic cylinder 31 operates in the other direction.
[0024]
During the maintenance described above, one of the two load channels A and B communicates with the supply channels P and P1 and the other communicates with the discharge channels R and R1 via the switching valve 34. In the supply flow paths P and P1, the check valve V1 blocks the flow of pressure liquid toward the hydraulic pressure source 32, and in the discharge flow paths R and R1, the stop valve V2 uses the relief function to apply pressure to the tank T. Restrict the flow of liquid. For this reason, the pressure liquid from the hydraulic unit 35 is supplied only to one required hydraulic cylinder 31 and is not supplied to the other hydraulic cylinders 30. Therefore, the hydraulic cylinder 30 that is not required at the time of maintenance of the machine tool can be reliably stopped, and safety can be further improved.
[0025]
Further, in the control valve device V of the present embodiment, the stop valve V2 can be switched between the relief function and the release function. Therefore, when the maintenance of the machine tool is completed and returned to normal, the operator sets the stop valve V2. Even if it is forgotten to return from the relief function state to the open function state, the pressure of the liquid flowing from the hydraulic cylinder 31 to the discharge flow path R through the switching valve 34 becomes the relief set pressure, so that the stop valve V2 opens and the pressure fluid Is discharged into the tank T. Therefore, the hydraulic cylinder 31 can be operated in a state where an excessive increase in pressure is suppressed.
[0026]
Further, in the control valve device V of the present embodiment, both the load channels A, B, both the connection channels A1, B1, the supply channels P, P1, and the discharge channels R, R1 are provided in the valve body 11, A check valve V1 is provided in the valve main body 11 and the supply flow paths P and P1 in the valve main body 11 to allow the flow to the switching valve 34 side and prevent the flow to the hydraulic pressure source 32 side. The stop valve V2 is provided in the valve main body 11 and the discharge passages R, R1 in the valve main body 11 and is spring-biased toward the valve seat 15 and is subjected to the spring force by the spring force. And a relief valve body 17 that is separated from the valve seat 15 against the spring force at the set pressure and allows the flow to the low pressure side, and can be freely advanced and retracted in the valve body 11. Relief by engaging with the back part of the relief valve body 17 at the first position assembled and withdrawing from the valve body 11 The body 17 is separated from the valve seat 15 against the spring force, and separated from the relief valve body 17 at the second position where the body 17 enters the valve body 11, and the relief valve body 17 is seated on the valve seat 15 by the spring force. Since the operation member 18 is provided, the valve body 11 can be shared as the flow path forming member, the check valve constituting member, and the stop valve constituting member, and the control valve device V can be made compact.
[0027]
Further, since the stop valve V2 includes the valve body 11, the relief valve body 17, and the operation member 18, a well-known relief valve (not shown) and an open / close switching valve (not shown) are connected in parallel to provide a relief function and an opening function. The stop valve V2 can be configured in a simple and compact manner compared to the case of configuring a stop valve capable of switching between the two.
[0028]
Further, in the control valve device V of the present embodiment, the operation member 18 of the stop valve V2 is brought into contact with the valve body 11 at the first position and the second position, respectively, and the first position and the second position are set. Since the setting portion 18a is provided, when the operator retreats the operation member 18 from the second position to the first position, the setting portion 18a contacts the valve body 11 when the operation member 18 reaches the first position. When the operation member 18 reaches the second position when the operation member 18 reaches the second position, the setting portion 18a comes into contact with the valve main body 11 and the further exit operation can be disabled. The entry operation can be disabled, and the operation member 18 can be accurately positioned at the first position and the second position by a simple operation.
[0029]
6 and 7 show another embodiment of the control valve device V according to the present invention. In this embodiment, the valve body is constituted by a lower valve body 11A and an upper valve body 11B. The connection flow path B1 is provided and the stop valve V2 is integrally assembled. The upper valve body 11B is provided with the connection flow path A1 and the check valve V1 is integrally assembled. In addition, since the other structure is substantially the same as the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In addition, the operational effects of this embodiment are considered to be easily understood from the operational effects of the above-described embodiment and the configuration shown in FIGS.
[0030]
In each of the above embodiments, the stop valve V2 includes the valve body 11, the relief valve body 17, and the operation member 18. However, the stop valve only needs to be able to switch between the relief function and the open function, and the relief function is always provided. It is also possible to provide a well-known relief valve capable of exhibiting the above and a well-known opening / closing switching valve that can be opened / closed in parallel, and to configure a stop valve with the relief valve and the opening / closing switching valve.
[0031]
Further, in the embodiment shown in FIG. 1, the control valve device V is provided only in the hydraulic circuit that controls the operation of the hydraulic cylinder 31, but it is necessary to operate the hydraulic cylinder 30 during maintenance. In this case, the control valve device V can be similarly provided in the hydraulic circuit that controls the operation of the hydraulic cylinder 30.
[Brief description of the drawings]
FIG. 1 is a hydraulic circuit diagram in a state in which a control valve device according to the present invention is applied to a machine tool and a hydraulic unit is connected.
2 is a detailed plan view of the control valve device shown in FIG. 1. FIG.
3 is an enlarged longitudinal sectional view taken along line 3-3 in FIG.
4 is a longitudinal sectional view taken along line 4-4 of FIG.
5 is a partially enlarged cross-sectional view showing a state in which an operation member is in a second position different from the state of FIG.
FIG. 6 is a longitudinal sectional view showing another embodiment of the control valve device according to the present invention.
7 is a plan view of the control valve device shown in FIG. 6. FIG.
FIG. 8 is a hydraulic circuit diagram of a machine tool not using the control valve device of the present invention.
[Explanation of symbols]
V: Control valve device, 11: Valve body, V1: Check valve, 12: Check valve seat, 13: Check valve spring, 14: Check valve body, V2: Stop valve, 15: Stop valve 16 ... Stop valve spring, 17 ... Stop valve relief valve element, 18 ... Stop valve operating member, 18a ... Setting part, A, B ... Load flow path, A1, B1 ... Connection flow path, P , P1, supply channel, R, R1, discharge channel, T, tank (low pressure side), 31 hydraulic cylinder (hydraulic actuator), 32 hydraulic source, 34 switching valve, 35 hydraulic unit.

Claims (3)

The fluid pressure actuator is operated by switching communication between the supply passage connected to the fluid pressure source, the discharge passage connected to the low pressure side, and the two load passages connected to the fluid pressure actuator by a switching valve. In each of the hydraulic pressure circuits, each of the load flow paths is provided with a connection flow path that can be connected to a hydraulic unit that supplies pressure liquid separately from the hydraulic pressure source, and the supply flow path is connected to the switching valve side. A control valve device comprising a check valve that allows flow and prevents flow to the hydraulic pressure source side, and a stop valve that can switch between a relief function and an open function in the discharge flow path. The load passages, the connection passages, the supply passage and the discharge passage are provided in a valve body, and the check valve is provided in the valve body and a supply passage in the valve body. A check valve body that allows a flow to the switching valve side and prevents a flow to the hydraulic pressure source side, and the stop valve is connected to the valve body and a discharge flow path in the valve body. Relief that is installed and spring-biased toward the valve seat and is seated on the valve seat by the spring force, allowing the flow to the low pressure side by separating from the valve seat against the spring force at the set pressure And a valve body that is assembled to the valve body so as to be freely movable back and forth, and engages with a back portion of the relief valve body at a first position where the valve body is retracted to resist the spring force against the spring force. The seat is separated from the valve seat and separated from the relief valve body at the second position to enter the valve body. Control valve device according to claim 1, characterized in that it has a configuration in which an operating member to be seated on the valve seat of the relief valve body in spring force Te. 3. The control according to claim 2, wherein the operation member is provided with a setting unit that sets the first position and the second position by contacting the valve body at the first position and the second position, respectively. Valve device.

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