JP6726475B2 - Hydraulic valve for slope work vehicles - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic valve for a slope work vehicle used in a slope work vehicle that can move a slope and can form a lock bolt insertion hole and a ground anchor insertion hole.

Conventionally, a slope work vehicle that supplies oil from a single hydraulic pump to a plurality of hydraulic actuators to wind a traveling device and a winch, for example, "is equipped with a traveling device that travels on steep slopes and slopes, And a vehicle body provided with a base plate that can be rotated in the horizontal direction, and a portion near the rear portion of the base plate of the vehicle body that maintains the horizontal state by its own weight even if the base plate is inclined, or by a drive device. An engine mounted via a support capable of maintaining a horizontal state, a hydraulic pump driven by the drive of this engine, and a support base so as to be rotatable in the front-rear direction at a front portion of the base plate. A workbench attached to the workbench, a workbench rotation device using a hydraulic cylinder that rotates the workbench in the front-rear direction, a work machine that is operated by hydraulic pressure attached to the workbench, and hydraulic oil to the hydraulic pump. Which is supplied via a supply hose and which stores the hydraulic oil attached to the base plate, and the hydraulic oil pressurized from the hydraulic pump, the traveling device of the vehicle body, and the worktable rotation. There is known a device such as "a slope work vehicle" (Patent Document 1), which comprises a device and a hydraulic drive device that supplies the work machine.

However, in such a slope work vehicle, for example, when oil is supplied to the traveling device and the winch from one hydraulic pump, both the winch and the traveling device are provided when the slope is gentle when climbing up the slope. However, if the slope of the slope becomes a steep angle, the traveling device spins idle and the load on the traveling device decreases.
Then, the oil flows toward the side with less load, only the traveling device spins idle, and the winch does not have the hydraulic pressure required to wind up the wire, so there is a drawback that it is not possible to climb uphill.

JP, 2013-119739, A

In view of the above-mentioned conventional drawbacks, the present invention provides a hydraulic valve for a slope work vehicle capable of supplying oil to a winch at an appropriate pressure even when the slope of the slope is steep. Has an aim.

In order to achieve the above object, a hydraulic valve for a slope working vehicle of the present invention includes a hydraulic actuator for a traveling device of a slope working vehicle, a hydraulic actuator for a winch, and a hydraulic pump for pumping oil for operating them. A hydraulic valve for a slope work vehicle provided between the valve body, the hydraulic valve for a slope work vehicle, comprising: a valve body; a piston sliding hole formed in the valve body; A movable piston, an origin return mechanism for returning the piston to an origin position, an oil passage for a traveling device formed in the valve body so as to penetrate the piston sliding hole, and the valve body A winch oil passage formed so as to penetrate through the piston sliding hole, and sealing means for sealing both ends of the piston sliding hole in a sealed state, and the sealing means is the winch. A positioning piece protruding toward the oil flow path for use, the piston is in contact with the positioning piece and the end portion of the piston at the origin position, and the piston has the oil flow path for the traveling device and the oil flow path for the winch. Has a seal portion that can be sealed so as not to communicate with each other through the piston sliding hole, and hinders the flow of oil in the traveling device oil flow path when the pressure of the oil flowing in the winch oil flow path increases. It is characterized by sliding like.

The present invention has the following effects.
(1) In the invention according to claim 1, the piston has a seal portion capable of sealing the traveling device oil passage and the winch oil passage so as not to communicate with each other through the piston sliding hole, When the pressure of the oil flowing in the winch oil flow path becomes high, it can slide so as to obstruct the oil flow in the traveling device oil flow path, so that a high load is applied to the winch and the winch oil flow path is changed. When the pressure of the flowing oil becomes high, the working oil can be efficiently supplied to the winch hydraulic actuator.
Therefore, it is possible to surely climb uphill by the winch even on a steep slope.
(2) When the pressure of the oil flowing in the winch oil passage becomes high, the piston slides, so that it is not necessary to provide a solenoid valve or the like, and the travel device oil passage can be automatically shut off substantially. ..

1 to 10 are explanatory views showing a first embodiment of the present invention.

11 to 13 are explanatory views showing the second embodiment of the present invention.
The front view of the hydraulic valve for slope working vehicles of the 1st Embodiment of this invention. The top view of the hydraulic valve for slope work vehicles. FIG. 3 is a sectional view taken along line 3-3 of FIG. 2. Front view of the piston. 5 is a sectional view taken along line 5-5 of FIG. Front view of the piston. 5 is a sectional view taken along line 5-5 of FIG. The schematic explanatory drawing of a hydraulic circuit. Explanatory drawing which shows the flow of the oil of a normal state. Explanatory drawing when the oil flow path for winches becomes high pressure. The front view of the hydraulic valve for slope working vehicles of 2nd Embodiment of this invention. The top view of the hydraulic valve for slope work vehicles. 13 is a sectional view taken along line 13-13 of FIG.

Hereinafter, the present invention will be described in detail with reference to the embodiments for carrying out the present invention shown in the drawings. In addition, the up-down direction is a front-view vertical direction, the left-right direction is a front-view left-right direction, and the front-back direction is a plan-view vertical direction (front-view depth direction).

In the first embodiment for carrying out the present invention shown in FIGS. 1 to 10, 1 is a hydraulic valve for a slope work vehicle. The hydraulic valve 1 for a slope work vehicle has a traveling device 2 capable of self-propelling as shown in FIG. 8 and a hydraulic circuit 4 of a slope work vehicle having a winch 3 capable of climbing a slope in a towed state. It is used, and is interposed between a hydraulic actuator 5 for a traveling device and a hydraulic actuator 6 for a winch of a slope work vehicle, and a hydraulic pump 7 for pumping oil for operating these.

As shown in FIG. 1 to FIG. 3, the hydraulic valve 1 for a slope working vehicle has a long cylindrical valve body 8 having a cylinder structure and a piston sliding hole 9 (formed in the valve body 8). A cylinder cylinder), a piston 10 slidably provided in the piston sliding hole 9, and a piston 10 provided at one end of the piston 10 for returning the piston 10 to the origin position (position shown in FIG. 3). An origin return mechanism 11, an oil passage 12 for a traveling device which is formed in the valve body 8 so as to penetrate the piston sliding hole 9 in a vertical direction in a substantially orthogonal state, and the valve body 8 for sliding the piston. A winch oil passage 13 formed so as to penetrate through the hole 9 in a substantially perpendicular direction in the vertical direction, and a sealing means 15 for sealing both ends of the piston sliding hole 9 in a sealed state (for example, through an O-ring 14). Sealing bolts 15a and 15b).

The valve body 8 has, for example, a substantially rectangular parallelepiped shape as shown in FIG. 1, and a piston sliding hole 9 is formed in the left-right direction at a substantially central portion. The piston sliding hole 9 is formed so as to penetrate the valve body 8 as shown in FIG. 3, and the left and right ends thereof are sealed bolts via O-rings 14 used as the sealing means 15. A screw groove into which 15a and 15b are screwed and an O-ring groove into which the O-ring 14 is attached are formed.

The vicinity of the center of the piston sliding hole 9 is formed to have a smaller diameter than the vicinity of the left and right end portions, and the diameter of this small diameter portion is substantially the same as the outer diameter of the piston 10.

As shown in FIG. 5, the valve body 8 has a traveling device oil passage 12 and a winch oil passage 13 formed in the vertical direction when viewed from the front. At the upper and lower ends of the traveling device oil flow path 12 and the winch oil flow path 13, threaded grooves for connecting pipes are formed.

The traveling device oil passage 12 and the winch oil passage 13 are communicated with each other through the piston sliding hole 9, but the traveling device oil is in use by the seal portion 16 of the piston 10 described later. The flow path 12 and the winch oil flow path 13 do not communicate with each other.

As shown in FIGS. 6 and 7, the piston 10 is formed in a substantially cylindrical shape, and both ends thereof are formed with a small-diameter cylindrical protruding portion 17 that protrudes outward. It is shaped like.

A seal portion 16 is formed at a portion having a larger diameter than the rear end portion of the piston 10 so as to prevent the traveling device oil passage 12 and the winch oil passage 13 from communicating with each other through the piston sliding hole 9. Has been done. In the present embodiment, the sealing portion 16 includes two packing grooves 17 formed in a portion having a larger diameter than the rear end portion of the piston 10, and a packing 19 provided in each packing groove 18. It is composed of.

Further, in the piston 10, in a state where the piston 10 is located at the origin position (position in FIG. 3), a flow of oil in the traveling device oil passage 12 is provided at a portion located in the traveling device oil passage 12. A constricted oil passage portion 20 is formed so as not to hinder the above.
In addition, since the constricted oil passage portion 20 is annularly recessed in the circumferential direction, the upper and lower traveling device oil passages 12 are in communication with each other.

A blind hole 21 is formed in one of the protruding portions 17a (the protruding portion 17a on the side of the traveling device oil flow path 12) from the tip portion to the vicinity of the constricted oil passage portion 20 at the axial center portion of the one protruding portion 17a. In the vicinity of the bottom of the blind hole 21, an oil escape hole 22 penetrating to the outer peripheral surface of the piston 10 is formed radially outward.

The home position return mechanism 11 is composed of a coil spring 23 provided between one protruding portion 17a of the piston 10 and one sealing bolt 15a (sealing bolt on the side of one protruding portion 17a), and the other always The sealing bolt 15b (sealing bolt on the winch oil passage 13 side) is urged.

A recess 24 for mounting the coil spring 23 is formed in the one sealing bolt 15a. One end of the coil spring 23 abuts on the recess 24 and the other end thereof is the one. Is in contact with the stepped portion at the base end of the protruding portion 17a.

The other sealing bolt 15b is formed with a positioning piece 25 protruding toward the winch oil flow path 13 side. The positioning piece 25 and the other protruding portion 17b of the piston 10 (the winch oil flow path). The protrusion 13) is brought into contact with the coil spring 23 by the biasing force of the coil spring 23, so that the pressure of the oil flowing in the winch oil flow path 13 becomes equal to the pressure of the oil flowing in the traveling device oil flow path 12. When the force is smaller than the force added by the urging force of 23, the piston 10 is located at the origin position.

As shown in FIG. 8, the hydraulic circuit 4 of the slope work vehicle using the hydraulic valve 1 for the slope work vehicle of the present invention is such that the oil pumped from one hydraulic pump 7 is used for the slope work vehicle of the present invention. Oil is supplied to the traveling device hydraulic actuator 5 and the winch hydraulic actuator 6 via the hydraulic valve 1 in so-called two systems, and the traveling device hydraulic actuator 5 and the winch hydraulic actuator 6 operate the traveling device 2 and the winch 3. ..

When the oil is supplied from the hydraulic pump 7 to the connection portion on the upstream side (upper side in front view) of the traveling device oil flow path 12 and the winch oil flow path 13 via the pipe, the oil in the hydraulic valve 1 for the slope work vehicle is supplied. As shown in FIG. 9, the flow of the oil flows through the traveling device oil passage 12 and the winch oil passage 12, and is downstream of the traveling device oil passage 12 and the winch oil passage 13 (downward in front view). Oil is supplied to the traveling device hydraulic actuator 5 and the winch hydraulic actuator 6 from the connecting portion through the pipe.

When the slope of the slope becomes a steep angle, a high load is applied to the winch 3, and the traveling device 2 is idling, as shown in FIG. The pressure of the oil flowing to the winch oil flow path 13 is higher than the biasing force of the coil spring 23. Then, the winch oil passage 13 side of the piston 10 is pressed by the high-pressure oil, and the piston 10 slides toward the traveling device oil passage 12 side. At this time, the oil in the sliding direction of the piston 10 flows out from the oil escape hole 22 formed in the piston 10 into the oil passage 12 for the traveling device, and the tip end portion of the piston 10 has one of the sealing bolts 15a. It abuts the bottom surface of the recess 24.

In this state, the oil passage portion 20 of the piston 10 is located on the sealing bolt 15a on one side of the oil passage 12 for the traveling device. It becomes a state where the flow of is blocked. Then, most of the oil pressure-fed from the hydraulic pump 7 is supplied to the winch hydraulic actuator 6, so that the winch 3 can be wound up with a high output, and the slope can be easily climbed even on a steep slope.

Here, the term “blocking the oil flow” means not only a state in which the oil flow is completely blocked, but also a state in which the oil flow is not completely blocked (a small amount of oil flows into the traveling device oil flow path 12). State) is also included.
When the high load on the winch 3 is released, for example, when the winch 3 is reached, the piston 7 is pressed by the coil spring 23 of the origin return mechanism 11, and the tip of the other protruding portion 17b has the other end. The sealing bolt 15b comes into contact with the positioning piece 24 and returns to the original position.

[Different Modes for Carrying Out the Invention]
Next, different modes for carrying out the present invention shown in FIGS. 11 to 13 will be described. In the description of these different modes for carrying out the present invention, the same components as those of the first mode for carrying out the present invention will be denoted by the same reference numerals, and redundant description will be omitted.
The second mode for carrying out the invention shown in FIGS. 11 to 13 is mainly different from the first mode for carrying out the invention in that a sealing without forming the recess 23 and the positioning piece 24 is performed. In the hydraulic valve 1A for a slope work vehicle as described above, the stop bolt 15A is used, and the other protrusion 17b directly contacts the other sealing bolt 15b so that the protrusion 17b is located at the origin position. Can be used as a mobile scaffold.

In the embodiment of the present invention, the sealing bolt using the O-ring is used as the sealing means, but the present invention is not limited to this. For example, the sealing bolt may be provided via a metal seal. Alternatively, sealing members (sealing plates or the like) may be fixed to both ends of the piston sliding hole by welding, bonding, or the like for sealing.

INDUSTRIAL APPLICABILITY The present invention is used in the industry of carrying out various works on a sloped surface such as a slope by being suspended by a winch wire and manufacturing a hydraulic valve used for a self-propelled slope work vehicle.

1: Hydraulic valve for slope work vehicle 2: Traveling device,
3: winch, 4: hydraulic circuit,
5: Hydraulic actuator for traveling device,
6: Hydraulic actuator for winch,
7: hydraulic pump, 8: valve body,
9: Piston sliding hole, 10: Piston,
11: Origin return mechanism, 12: Travel device oil passage,
13: oil passage for winch, 14: O-ring,
15: sealing means, 16: seal part,
17: protrusion, 18: groove for packing,
19: packing, 20: oil passage part,
21: blind hole, 22: oil escape hole,
23: coil spring, 24: recess,
25: Positioning piece.

Claims (1)

A hydraulic valve for a slope working vehicle, which is provided between a hydraulic actuator for a traveling device of a slope working vehicle, a hydraulic actuator for a winch, and a hydraulic pump for pumping oil for operating them. BACKGROUND ART A vehicle hydraulic valve includes a valve body, a piston sliding hole formed in the valve body, a piston slidably provided in the piston sliding hole, and an origin return mechanism for returning the piston to an origin position. A travel device oil passage formed in the valve body so as to penetrate the piston sliding hole, and a winch oil passage formed in the valve body so as to penetrate the piston sliding hole. And a sealing means for closing both ends of the piston sliding hole in a hermetically sealed state, wherein the sealing means includes a positioning piece projecting toward the winch oil flow path side, and the piston is at the origin position as described above. The positioning piece and the end portion of the piston come into contact with each other, and the piston has a seal portion capable of sealing the traveling device oil passage and the winch oil passage so as not to communicate with each other through the piston sliding hole. At the same time, when the pressure of the oil flowing in the winch oil passage increases, it slides so as to obstruct the oil flow in the traveling device oil passage, and the hydraulic valve for slope working vehicles.

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