JP4058727B2 - Hydraulic supply device to hydraulic cylinder for correction of buried pipe propulsion direction correction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a method for correcting a buried pipe propulsion direction in which a blade is connected to a tip of a buried pipe to be propelled by at least three correcting hydraulic cylinders in a horizontal excavation of a buried pipe such as a fume pipe. The present invention relates to a hydraulic pressure supply device to a correction hydraulic cylinder in the apparatus.
[0002]
[Prior art]
Conventionally, as a hydraulic supply device of this type, a hydraulic power source unit such as an oil tank or a hydraulic pump is installed outside the buried pipe, and two pressure oil supply hoses and a pressure oil return hose connected to the hydraulic power source unit are provided. Passing through the buried pipe and extending to the correction hydraulic cylinder, where there is a switching solenoid valve for switching pressure oil to the head side inner chamber and the rod side inner chamber of each correction hydraulic cylinder, respectively. Of the above-described correction hydraulic cylinders, there is known a configuration in which the correction hydraulic cylinder is connected via a drive selection solenoid valve for supplying and discharging pressure oil only to the hydraulic cylinder necessary for correcting the propulsion direction. ing.
[0003]
However, in the above-mentioned conventional apparatus, since the two hoses of the pressure oil supply hose and the pressure oil return hose must be installed in the buried pipe, the work of adding the two hoses becomes complicated as the buried pipe is added. It is necessary to secure a space for piping the two hoses without hindrance in the long buried pipe.
[0004]
[Problems to be solved by the invention]
This invention makes it a subject to improve so that the two hoses of the pressure oil supply hose and the pressure oil return hose in a conventional apparatus may be enough.
[0005]
[Means for achieving the object]
As means for achieving the above object, the present invention provides:
In the buried pipe propulsion direction correcting device in which the blade end is swingably connected to the tip of the buried pipe to be propelled by at least three correcting hydraulic cylinders.
One pressure oil supply / return hose connected to a hydraulic power source unit composed of an oil tank, a hydraulic pump, etc. installed outside the buried pipe is passed through the buried pipe and extended to the correction hydraulic cylinder. The expansion / contraction switching valve that switches the pressure oil supply to the head side inner chamber and the rod side inner chamber of each of the correction hydraulic cylinders, and only the hydraulic cylinders necessary for correcting the propulsion direction of the correction hydraulic cylinders. Connect to each correction hydraulic cylinder via drive selection valve to select supply,
An accumulator is provided for receiving pressure oil extruded from the other when pressure oil is supplied to one of the head-side and rod-side inner chambers, and the pressure accumulated in the accumulator when the correction hydraulic cylinders are stopped from extending and contracting. The oil was returned to the oil tank through the pressure oil supply / return hose.
This paper proposes a hydraulic pressure supply device to the hydraulic cylinder for correction of the buried pipe propulsion direction correction device.
Embodiments of the present invention will be described below with reference to the drawings.
[0006]
【Example】
In FIG. 1, a short leading pipe (2) is detachably connected to the tip of a pipe (1) to be buried by horizontal digging propulsion, and four correction hydraulic pressures are installed inside the leading pipe (2) in this example. Cylinders (4a), (4b), (4c), and (4d) are fixed in a state parallel to the axial center line at intervals of 90 degrees on an arc centered on the axial center of the tip conduit (2). In addition, a short cylindrical blade (3) is connected to the tip of the leading pipe (2) by the correction hydraulic cylinders (4a) to (4d) so as to freely swing. (5) is a soil removal screw rod vertically passed through the pipe (1), and (6) is an excavation head connected to the tip of the screw rod (5).
[0007]
The hydraulic pressure supply device to the correction hydraulic cylinders (4a) to (4d) is as follows. Referring to FIG. 2, a hydraulic power source unit (A) mainly including an oil tank (7) and a hydraulic pump (8) is installed in a pit opened at the starting point of the horizontal digging propulsion, and the hydraulic pump (8) has one end. The pressure oil supply / return hose (9) connected to the pipe is extended through the pipe (1) to the front conduit (2), and the hydraulic pressure switching unit (B) disposed in the front conduit (2) ). In the hydraulic power source unit (A), a return oil passage (10) branched from the pressure oil supply / return hose (9) is connected to an oil tank (7) via a return switching solenoid valve (11). It is. The solenoid valve (11) can be switched between a return path and a closed path. (12) is a relief valve.
[0008]
The configuration of the hydraulic pressure switching unit (B) is as follows. Referring to FIG. 2, the hose (9) is branched into oil passages (13) and (14), and both branch hoses (13) and (14) can be switched to a feed path, a return path and a closed path. Solenoid valves (15) and (16) are connected to each other, and then the base oil passage (17) drawn from one solenoid valve (15) is connected to the oil passages (18), (19), (20), (21 ) And the branch oil passages (18) to (21) can be switched to open and closed via the drive selection solenoid valves (22a), (22b), (22c) and (22d). The hydraulic passages (23) connected to the head side inner chambers of the hydraulic cylinders (4a) to (4d) and drawn out from the other solenoid valve (16) are connected to the inside of the rod side of the hydraulic cylinder (4a) for correction. Connect to the chamber and use the hydraulic (4a) and (4b), (4b) and (4c), (4c) and (4d), the rod side inner chambers are connected by oil passages (24), (25), and (26), respectively. The oil passages (27), (28) connected to the return paths and the closed paths of the expansion / contraction switching valves (15), (16) are connected to the accumulator (30) via the base oil passage (29). The base oil passage (29) and the supply / return hose (9) are connected by an oil passage (31), and the base oil passage (29) is connected to the oil passage (31) from the hose (9). A check valve (32) is interposed to stop the flow to the.
[0009]
The operation of the above-described hydraulic pressure supply apparatus will be described. Now, when the hydraulic cylinders (4a) to (4d) for correction are reduced and the blade edge (3) is in a normal posture as shown in FIG. 1, only the hydraulic cylinders (4c) and (4d) are used to correct the propulsion direction. 2 to drive the branch oil passages (20) and (21) by opening the solenoid valves for selection (22c) and (22d) in the unit (B) as shown in FIG. When the solenoid valves (22a) and (22b) are not operated, the branch oil passages (18) and (19) are closed by the closed circuits, and when one of the switching solenoid valves (15) is not operated. The oil passages (13) and (17) are communicated with each other by the feed passage, the oil passages (17) and (27) are shut off by the closed passage, and the oil passage ( 14 , The blocking (23), the oil passage (23) in its return path, communicating (28).
[0010]
In the unit (A), the return oil passage (10) is closed by the operation of the return switching solenoid valve (11).
[0011]
If each valve is adjusted as described above, the pressure oil pumped from the hydraulic pump (8) is supplied and returned to the hose (9), the branch oil passage (13), the switching solenoid valve (15), the base oil passage. (17), the branch oil passages (20) and (21) and the selection solenoid valves (22c) and (22d) are supplied to the head side inner chambers of the correction hydraulic cylinders (4c) and (4d). Thus, the cylinders (4c) and (4d) are extended to incline the blade edge (3) in a required direction, and the desired propulsion direction is corrected by the subsequent propulsion.
[0012]
As the correction hydraulic cylinders (4c) and (4d) extend, the pressure oil in the rod-side inner chambers of the cylinders (4c) and (4d) becomes oil passages (26), (25) and (24). , (23), the switching solenoid valve (16), the branch oil passage (28) and the base oil passage (29), and then pumped and accumulated in the accumulator (30).
[0013]
Next, as shown in FIG. 3, the selection solenoid valves (22c) and (22d) are switched to OFF to close the branch oil passages (20) and (21), and the switching solenoid valves ( 16) is turned OFF, and the oil passages (23) and (28) are shut off by the closed circuit, and the oil passages (14) and (23) are communicated by the feed passage, and the unit (A) is used for return switching. The solenoid valve (11) is switched off and the return oil passage (10) is opened by the return passage.
[0014]
If each valve is adjusted as described above, the high-pressure oil accumulated in the accumulator (30) becomes the base oil passage (29), the check valve (32), the supply / return hose (9), the return oil passage (10 ) And the solenoid valve (11), and then returned to the oil tank (7). At that time, the pressure oil delivered from the hydraulic pump (8) is also returned to the oil tank (7) through the return oil passage (10).
[0015]
When the above-described extended correction hydraulic cylinders (4c) and (4d) are reduced after the propulsion direction is corrected, as shown in FIG. 4, the selection solenoid valves (22c) and (22d) are actuated so as to branch in the open circuit. The oil passages (20) and (21) are opened, and the operation of the switching solenoid valve (15) causes the oil passages (17) and (27) to communicate with each other in the return path, and the oil passage (13) in the closed path. , (17) is cut off.
[0016]
In the unit (A), the return oil passage (10) is closed by the operation of the return switching solenoid valve (11).
[0017]
If each valve is adjusted as described above, the pressure oil pumped from the hydraulic pump (8) is supplied and returned to the hose (9), the branch oil passage (14), the switching solenoid valve (16), and the oil passage (23 ), (24), (25), (26), and supplied to the rod side inner chamber of the correction hydraulic cylinders (4c), (4d), thereby reducing the cylinders (4c), (4d). The inclined cut (3) is returned to the normal posture.
[0018]
As the hydraulic cylinders (4c) and (4d) are reduced, the pressure oil in the head-side inner chambers of the cylinders (4c) and (4d) becomes oil passages (20) and (21), a solenoid valve (22c), (22d), the base oil passage (17), the solenoid valve (15), the branch oil passage (27), and the base oil passage (29) are pumped to the accumulator (30) and accumulated.
[0019]
Next, as shown in FIG. 5, the selection solenoid valves (22c) and (22d) are switched to OFF, the branch oil passages (20) and (21) are closed by the closed circuit, and the switching solenoid valve (15 ) Is turned OFF, and the hoses (17) and (27) are shut off at the closed circuit, and the oil paths (13) and (17) are communicated with each other through the feed path. In the unit (A), the return switching solenoid valve ( 11) is switched OFF, and the return oil passage (10) is opened by the opening.
[0020]
By adjusting as described above, the high-pressure oil accumulated in the accumulator (30) is returned to the oil tank (7) through the supply / return hose (9) as in FIG.
[0021]
【The invention's effect】
According to the hydraulic pressure supply device to the correction hydraulic cylinder of the buried pipe propulsion direction correction device of the present invention, the hydraulic oil can be supplied and discharged from the hydraulic power source unit to the correction hydraulic cylinder by one pressure oil supply / return hose. As a result, it is possible to simplify the work of adding the hose accompanying the addition of the buried pipe, and it is also possible to easily connect the pipe to the deep buried pipe.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a tip portion of a buried pipe in a horizontal digging pipe burying apparatus.
FIG. 2 is a hydraulic circuit diagram in a state where two hydraulic cylinders for correction are extended.
FIG. 3 is the same view as above in a state in which the pressure oil of the accumulator is returned to the oil tank from the state of FIG. 2;
FIG. 4 is the same view as above in a state in which the two correction hydraulic cylinders are contracted.
FIG. 5 is the same view as above in a state in which the pressure oil of the accumulator is returned to the oil tank from the state of FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe to be embedded 3 Cutting edge 4a, 4b, 4c, 4d Correction hydraulic cylinder 7 Oil tank 8 Hydraulic pump 9 Pressure oil supply / return hose A Hydraulic power source unit 15, 16 Solenoid valve for expansion / contraction switching)
22a, 22b, 22c, 22d Drive selection solenoid valve 30 Accumulator B Hydraulic switching unit

Claims (1)

In the buried pipe propulsion direction correcting device in which the blade end is connected to the tip of the buried pipe to be propelled by at least three correcting hydraulic cylinders so as to freely swing.
One pressure oil supply / return hose connected to a hydraulic power source unit composed of an oil tank, a hydraulic pump, etc. installed outside the buried pipe is passed through the buried pipe and extended to the correction hydraulic cylinder. The expansion / contraction switching valve that switches the supply of pressure oil to the head-side inner chamber and the rod-side inner chamber of each of the correction hydraulic cylinders, and only the hydraulic cylinders necessary for correcting the propulsion direction of the correction hydraulic cylinders. Connect to each correction hydraulic cylinder via drive selection valve to select supply,
An accumulator is provided for receiving pressure oil extruded from the other when pressure oil is supplied to one of the head-side and rod-side inner chambers, and the pressure accumulated in the accumulator when the correction hydraulic cylinders are stopped from extending and contracting. The oil was returned to the oil tank through the pressure oil supply / return hose.
Hydraulic supply device to the hydraulic cylinder for correction of the buried pipe propulsion direction correction device.

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