JP2950822B1 - Drilling rig - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To reduce the length of a hydraulic hose from the ground side, so that it is not necessary to wind and unwind the hydraulic hose during work.
Provided is an excavator that has a longer life and can improve workability of excavation. A first hydraulic cylinder with a single-acting spring is provided.
And a remote control unit 10 connected to one hydraulic hose G extending from a hydraulic unit placed on the ground, suspended by a crane, and standing by without standing up and down, and lifted and lowered by the crane Casing 23 suspended so as to be able to ascend and descend through a weight 22 attached to the lower end of the elevating wire c to be connected and to be separable and connectable to the remote operation unit 10.
, A bucket 2 that can be opened and closed at the bottom of the casing 23
The excavating apparatus 1 is formed from the excavating unit main body 1 having a second accumulator 28 for generating a force for closing the bucket 21 inside the casing 23 and obtaining the force for opening the bucket 21 from the first hydraulic cylinder 13. Have been.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling apparatus for removing earth and sand inside a large-diameter steel pipe which is pressed into the ground, for example.

[0002]

2. Description of the Related Art Conventionally, an excavator 51 shown in FIG. 10 has been used. The excavator 51 is provided with a steel pipe P by a steel pipe press-fitting device B placed on the ground with a counterweight A.
Is press-fitted into the ground to remove soil and the like in the steel pipe P, and has a bucket 52 provided at the lower part so as to be openable and closable, and is hung up and down by a crane D. The steel pipe press-fitting device B is driven by a hydraulic unit E installed on the ground. The excavator 51 has a double-acting hydraulic cylinder that is extended and contracted by a hydraulic unit H also placed on the ground via two hydraulic hoses G1 and G2 that are wound and unwound by a hose reel F, The bucket 52 is opened and closed by the hydraulic cylinder. By the way, one of the two hydraulic hoses G1 and G2 is for extending the hydraulic cylinder,
The other hydraulic hose G2 is for contracting the hydraulic cylinder.

[0003] Then, the excavator 51 suspended above by the crane D is lowered to the lowermost portion in the steel pipe P with the bucket 52 open, and the bucket 52 is closed here to excavate the lowermost ground. Then, the excavated soil and the like are collected in the bucket 52, and the excavator 51 is raised by the crane D to above the steel pipe P as shown in FIG. Further, the bucket 52 is moved above a soil transporting means (not shown), for example, a loading platform of a dump truck, and the bucket 52 is opened to transfer the soil and the like in the bucket 52 onto the loading platform. Then, the excavator 51 in a state where the bucket 52 is opened is returned to the original position above the steel pipe P, and thereafter, the above-described operation is repeated to press-fit the steel pipe P while removing soil and the like in the steel pipe P. Will be

[0004]

In the case of the conventional excavator 51 described above, the excavator 5 suspended by the crane D is used.
The entire bucket 1 is moved up and down, and the bucket 52 is opened and closed by a double-acting hydraulic cylinder in the excavator 51. For this reason, two hydraulic hoses G from the hydraulic unit H to the excavator 51, more specifically the hydraulic cylinder
1 and G2, and the hose reel F needs to have a large size. In addition to this,
The portion of the hydraulic hoses G1 and G2 on the side of the excavator 51 repeatedly moves back and forth between the upper side of the steel pipe P and the inside of the steel pipe P together with the excavator 51. For this reason, very long hydraulic hoses G1 and G2 are required, and it takes time to wind and unwind the hydraulic hoses G1 and G2 at the time of work. You will be hurt.

Further, the portions of the hydraulic hoses G1 and G2 on the side of the excavator 51 are constantly hit against and rubbed against the inner wall of the steel pipe P, and the wear and damage thereof are severe. There are various major problems, such as an increase in the frequency of hose replacement that requires the replacement. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problems, and has a need to shorten the length of a hydraulic hose from the ground side to be connected, thereby eliminating the need to wind and unwind the hydraulic hose during work. It is an object of the present invention to provide an excavator capable of eliminating the movement of the hydraulic hose that causes damage to the hydraulic hose, extending the life of the hydraulic hose, and improving the workability of excavation.

[0006]

According to a first aspect of the present invention, there is provided a hydraulically driven excavator suspended by a crane and excavating and transporting earth and sand by a bucket provided at a lower portion. A remote control unit having a hydraulic cylinder, connected to a hydraulic hose extending from a hydraulic unit placed on the ground side for operating the first hydraulic cylinder, suspended by the crane, and waiting above; It has a casing that can be lifted and lowered via a weight attached to the lower end of a lifting wire that is raised and lowered by a crane, and that can be coupled to and separated from the remote control unit. The weight is engaged with the casing so that only the weight can be lowered independently. When the weight is connected to the remote control unit, the casing is engaged by the force from the first hydraulic cylinder. An excavating body that opens a bucket and switches the hydraulic circuit including an accumulator provided in the casing by independent lowering of the weight only when the bucket is separated from the remote operation unit, and generates a force to close the bucket by the accumulator. Department.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the first hydraulic cylinder of the remote control section has a first piston rod projecting at least below a cylinder tube. When the rod is operated downward by hydraulic pressure, a force for opening the bucket is applied to the excavation body.

[0008] Further, according to a third aspect of the present invention, in addition to the configuration of each of the above-mentioned aspects, the excavating main body has a double-acting double rod type.
A hydraulic cylinder, the second piston rod of which receives the force from the first piston rod at the time of the coupling to open the bucket, and at the time of the separation, closes the bucket by the action of pressure oil from the accumulator. It is configured to operate on.

According to a fourth aspect of the present invention, in addition to the above features, the remote controller operates in a closing direction when the first piston rod operates downward. When operating upward, the excavating body has a movable projection that operates in an opening direction, and the excavation body engages with the movable projection by closing the movable projection on the upper surface of the casing. The unit has a fixing recess for coupling to the remote control unit.

A fifth aspect of the present invention is directed to a remote control unit which is suspended by a crane and connected to a hydraulic hose from a hydraulic unit placed on the ground side and stands by above, and a lifting wire which is raised and lowered by the crane. A lower part of a casing hung up and down via a weight attached to a lower end of the excavating body part provided with a bucket openable and closable, and the remote control part is at least below the cylinder tube. A protruding first piston rod,
And a first hydraulic cylinder driven by the hydraulic unit and a lower end of the first piston rod. When the first piston rod operates downward, the first piston rod operates in a closing direction. When the rod operates upward, it has a movable convex portion that operates in the opening direction, and the excavation body portion engages with the movable convex portion by closing the movable convex portion on the upper surface of the casing. It has a fixed concave portion that couples the excavating body to the remote control unit, and a second piston rod that operates up and down to open and close the bucket, and is a double-acting, double-rod type that is located inside the casing. The second hydraulic cylinder and the oil for keeping the second piston rod of the second hydraulic cylinder lowered are sent out, and when the second piston rod is raised, the second hydraulic system is discharged. First save the oil came back from Sunda 1
An accumulator, a second accumulator for delivering oil for raising the second piston rod, and a second accumulator for storing oil returned from the second hydraulic cylinder when the second piston rod descends; And is pushed up when the second piston rod of the second hydraulic cylinder is raised, and is pushed down by the downward operation of the first piston rod when both the remote control unit and the excavation main body unit are connected. A weight having a rod, and an intermediate depressing portion for depressing the second piston rod when the rod is depressed, and the weight dropped together with the lifting wire with respect to the casing in the casing. In this case, a state in which pressure oil is sent from the second accumulator to the second hydraulic cylinder by engaging with the weight. And a switching valve for shifting the configuration with.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a use state of the excavator 1 according to the first embodiment of the present invention, and portions common to those shown in FIG. The excavating apparatus 1 includes a remote operation unit 10 and an excavating unit main body 20. Of these, remote control unit 1
Numeral 0 is suspended by a crane D via fixed wires a and b, stands by above, and is connected to a hydraulic hose G from a hydraulic unit H placed on the ground side. It is hung by an elevating wire c that moves up and down, can be coupled to and separated from the remote control unit 10, and has a bucket 21 that can be opened and closed at the bottom.
The bucket 21 is opened and closed by the hydraulic unit H via the remote control unit 10.

Hereinafter, the excavator 1 will be described with reference to FIGS.
Will be described in more detail. The remote control unit 10 includes a first piston rod 1 protruding up and down of a cylinder tube 11.
2 and is engaged with a first hydraulic cylinder 13 with a single-acting spring driven by a hydraulic unit H and a tapered lower end of the first piston rod 12, and the first piston rod 12 The first piston rod 12 has a movable projection 14 which operates in a closing direction when the first piston rod 12 is operated upward due to a spring force.

The excavating section main body 20 is provided with a first piston rod 1
2 is suspended via a weight 22 attached to the lower end of a wire c extending through the center of the wire c. Further, the excavated portion main body 20 has a fixed concave portion 24 erected on the upper surface of the casing 23, and the excavated portion main body 20 approaches the remote operation portion 10 from below, and the first
When the piston rod 12 is relatively lowered, the movable convex portion 14 is closed, and the fixed concave portion 24 and the movable convex portion 14 are engaged with each other to be connected. In the casing 23, a weight 22 is located, and a double-acting, double-rod type second hydraulic cylinder 25 provided to be vertically expandable and contractible, and a second piston projecting vertically from the second hydraulic cylinder 25 Rod 2
6, while the second piston rod 26
A first accumulator 27 for storing the oil returned from the second hydraulic cylinder 25 when the pressure rises, and a second piston rod 2
A second accumulator 28 is provided for sending out the pressure oil for raising the pressure 6 and storing the oil returned from the second hydraulic cylinder 25 when the second piston rod 26 descends.

The weight 22 rises together with the casing 23, and can be independently lowered when the casing 23 stops descending. On the other hand, a switching valve 29 is provided which engages with the weight 22 when the weight 22 is relatively lowered with respect to the casing 23, and by the engagement of the two, the second hydraulic cylinder is moved from the second accumulator 28 to the second hydraulic cylinder. 25
The hydraulic circuit is switched so as to send the pressure oil to the hydraulic circuit. Also,
Above the second piston rod 26, there is provided a lower plate 30 abutting against the second piston rod 26, and a rod 31 extending upward from the lower plate 30 and penetrating through the upper wall of the casing 23 so as to be vertically movable. A pressing portion 32 is provided.

The intermediate push-down portion 32 rises together with the second piston rod 26, and the first piston rod 1
When the first piston rod 12 is relatively lowered with respect to the cylinder tube 11 in a state of being in contact with the lower surface of the second member 2, the movable convex portion 14 and the fixed concave portion 24 are engaged, and the remote control portion 10 and the excavation are engaged. The second piston rod 26 is pushed down at the same time when the second main body 20 is connected. In addition, the intermediate pressing part 32 does not necessarily need to be fixed to the second piston rod 26. The lower end of the second piston rod 26 projecting below the casing 23 and the bucket 21
The bucket 33 is closed when the second piston rod 26 rises, and the bucket 21 is opened when the second piston rod 26 descends.

Next, the operation of the excavator 1 will be described step by step. In the first state, as shown in FIG. 2, in the excavator 1, the excavation unit main body 20 is lifted above a steel pipe (not shown) by the lifting wire c, and is connected to the remote operation unit 10. The first piston rod 12 descends relatively to the cylinder tube 11 by the pressure oil, the movable projection 14 engages with the fixed recess 24, and the second piston rod 26 is pushed down through the intermediate pushing-down part 32. The bucket 21 is opened. In the second state, as shown in FIG. 3, the oil is allowed to return to the hydraulic unit H, and the first piston rod 12 is moved up relative to the cylinder tube 11 by the action of a spring force to thereby move the movable protrusion. 14 is removed from the fixing recess 24, and the lifting wire c
At the same time, the excavating portion main body 20 is lowered toward a steel pipe (not shown).

In the third state, as shown in FIG. 4, the excavated portion main body 20 descends into the steel pipe P, and eventually the steel pipe P
The bucket 21 enters the ground and stops descending, while the weight 22 continues descending in the casing 23. In the fourth state, as shown in FIG. 5, the weight 22 that continues to descend in the casing 23 engages with the switching valve 29, and the second accumulator 28 sends the second hydraulic cylinder 25
Is supplied to the second hydraulic cylinder 25
Returns to the first accumulator 27, and the second piston rod 26 is pushed upward. As a result, the bucket 21 closes and excavates and holds earth and sand inside the steel pipe P. Further, the intermediate pressing portion 32 is raised, and the rod 31 projects higher above the casing 23.

In the fifth state, as shown in FIG. 6, the excavating portion main body 20 is lifted from the steel pipe P, and
It is raised towards zero. At this stage, the excavation unit main body 20 disengages the weight 22 from the switching valve 29 and
1 closes and holds excavated earth and sand, and rod 3
1 is in a state of protruding most upward. On the other hand, the remote control unit 10 is in a state where the first piston rod 12 is raised by the spring force, and the movable projection 14 is open. Sixth
In the state shown in FIG. 7, the excavating portion main body 20 continues to move upward, and the rod 31 eventually comes into contact with the lower surface of the first piston rod 12, as shown in FIG. Then, by operating the crane D in this state, the bucket 21 holding the excavated earth and sand is moved to a transporting means, for example, above the loading platform of the dump truck.

Then, the operation returns to the first state shown in FIG.
Is lowered relative to the cylinder tube 11,
The movable convex portion 14 is engaged with the fixed concave portion 24 so that the remote control portion 1
0 and the excavating section main body 20 while connecting the intermediate pressing section 3
The bucket 21 is opened by pushing down the second piston rod 26 through the second 2 to discharge the earth and the like. Thereafter, while the excavator 1 is maintained in this state, the crane D is operated to move the excavator 1 above the steel pipe P again, and the above-described operation is repeated.

As described above, in this excavator 1, only one hydraulic hose G from the hydraulic unit H placed on the ground is connected to the remote control unit 10 which stands above without going up and down. The length of the hydraulic hose G is short, and a small hose reel F is sufficient. In addition, since the remote control unit 10 does not move up and down, winding and unwinding of the hydraulic hose G during excavation work becomes unnecessary, so that excavation workability can be improved. Furthermore, even in the case of, for example, a steel pipe press-fitting operation, the hydraulic hose G does not enter the steel pipe, the hydraulic hose hits the inner wall of the steel pipe, and no scratches are caused by rubbing, thereby extending the life of the hydraulic hose. It is possible,
It has also become possible to reduce the frequency of laborious and expensive hose replacements.

FIG. 8 shows a state of use of the excavator 2 according to the second embodiment of the present invention, and is substantially the same as FIG. 1 except that the excavator 2 is used in place of the excavator 1. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. Although not shown in FIG. 8, the excavator 2 includes a remote operation unit 10 using a double-acting hydraulic cylinder and an excavation unit main body 20. The hydraulic hoses G, G0 extend.

FIG. 9 shows the excavator 2, more specifically, the excavator 2 in a state corresponding to the state of the excavator 1 in the process of shifting from the first state to the second state. As described above, the excavator 2 uses a double-acting first hydraulic cylinder 13A instead of the single-acting spring-equipped first hydraulic cylinder 13 in the excavator 1, and accordingly, one of the cylinder tubes In addition to the hydraulic hose G for the internal space, a hydraulic hose G0 for the other internal space of the cylinder tube is provided, and the movement of the excavator 2 is the same as that of the excavator 1. Also, the hydraulic hose G0
This excavator 2 has the same advantages as described above, except that the hose reel F becomes bulkier accordingly.

[0023]

As is apparent from the above description, according to the present invention, the hydraulic system having the first hydraulic cylinder and extending from the ground-side hydraulic unit for operating the first hydraulic cylinder is provided. A remote control unit connected to a hose, suspended by a crane via a fixed wire, and waiting above, and vertically movable via a weight attached to the lower end of a lifting wire that is raised and lowered by the crane; and A casing, which is hung detachably from the remote control unit, has a bucket openable and closable at a lower portion of the casing, and an accumulator for generating a force for closing the bucket inside the casing; And a digging portion main body that obtains a force for opening the first hydraulic cylinder from the first hydraulic cylinder.

For this reason, the hydraulic hose from the ground side to be connected is connected to the remote control unit which stands by above, so that its length can be shortened, and winding and winding of the hydraulic hose during excavation work can be performed. Return work becomes unnecessary, and it becomes possible to improve the workability of excavation, and also, for example, the hydraulic hose hits the inner wall of the steel pipe as in the case of steel pipe press-fitting work,
It is possible to eliminate the occurrence of scratches due to rubbing, to prolong the service life of the hydraulic hose, and to reduce the frequency of laborious and costly replacement of the hydraulic hose.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a use state of an excavator according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a first state of the excavator shown in FIG.

FIG. 3 is a cross-sectional view showing a second state of the excavator shown in FIG.

FIG. 4 is a cross-sectional view showing a third state of the excavator shown in FIG.

FIG. 5 is a cross-sectional view showing a fourth state of the excavator shown in FIG.

FIG. 6 is a sectional view showing a fifth state of the excavator shown in FIG. 1;

FIG. 7 is a sectional view showing a sixth state of the excavator shown in FIG.

FIG. 8 is a diagram illustrating a use state of an excavator according to a second embodiment of the present invention.

9 is a cross-sectional view of the excavator shown in FIG.

FIG. 10 is a diagram showing a use state of a conventional excavator.

[Explanation of symbols]

Reference numerals 1, 2 Excavator 10 Remote control unit 11 Cylinder tube 12 First piston rod 13, 13A First hydraulic cylinder 14 Movable projection 20 Excavation unit main body 21 Bucket 22 Weight 23 Casing 24 Fixed recess 25 Second hydraulic cylinder 26 Second Piston rod 27 First accumulator 28 Second accumulator 29 Switching valve 30 Lower plate 31 Rod 32 Intermediate pressing part c Lifting wire

Claims (5)

(57) [Claims] 1. A hydraulically driven excavator suspended by a crane and excavating and transporting earth and sand by a bucket provided at a lower portion, comprising: a first hydraulic cylinder, and a ground for operating the first hydraulic cylinder. Connected to a hydraulic hose extending from a hydraulic unit placed on the side, suspended by the crane,
A remote operation unit that stands by above, and a casing that can be lifted and lowered via a weight attached to the lower end of a lifting wire that is raised and lowered by the crane, and that can be suspended and combined with the remote operation unit. In addition, when the descent of the casing is stopped, only the weight is allowed to independently descend so that the weight is engaged with the casing. When the weight is coupled with the remote control unit, the weight is applied by the force from the first hydraulic cylinder. While the bucket is opened, when separated from the remote control unit, the hydraulic circuit including the accumulator provided in the casing is switched by independent lowering of the weight alone, and the excavating body generates a force for closing the bucket by the accumulator. A drilling rig characterized by comprising a part. 2. A first hydraulic cylinder of the remote control unit,
At least a first piston rod protruding below the cylinder tube, wherein the first piston rod is actuated downward by hydraulic pressure to apply a force for opening the bucket to the excavating body. Item 1. The excavator according to Item 1. 3. The excavating body has a double-acting, double-rod, second hydraulic cylinder, and the second piston rod receives the force from the first piston rod during the coupling to move the bucket. 3. The excavator according to claim 1, wherein the excavator is operated to open and to close the bucket under the action of pressure oil from the accumulator during the separation. 4. 4. The remote control unit operates in a closing direction when the first piston rod operates downward,
When the first piston rod operates upward, the first piston rod has a movable convex portion that operates in an opening direction, and the excavation main body includes:
4. A fixed concave portion on the upper surface of the casing, the fixed concave portion being engaged with the movable convex portion by closing the movable convex portion and connecting the excavation main body portion to the remote operation portion. A drilling rig according to any of the claims. 5. A remote control unit which is suspended by a crane and is connected to a hydraulic hose from a hydraulic unit placed on the ground side and stands by above, and is attached to a lower end portion of a lifting wire which is raised and lowered by the crane. A lower body of a casing suspended in an ascending and descending manner via a weight that is provided, and a digging main body part provided with an openable and closable bucket, wherein the first remote control unit protrudes at least below a cylinder tube. A first hydraulic cylinder having a rod and driven by the hydraulic unit, and engaged with a lower end of the first piston rod, in a closing direction when the first piston rod is operated downward by hydraulic pressure; And a movable projection that operates in an opening direction when the first piston rod operates upward. The movable convex portion is closed on the upper surface of the ring, and the fixed convex portion engages with the movable convex portion and couples the excavating main body portion to the remote control portion. A double-acting, double-rod type second hydraulic cylinder having a piston rod and located inside the casing, and delivering oil for keeping the second piston rod of the second hydraulic cylinder lowered. On the other hand, a first accumulator for storing the oil returned from the second hydraulic cylinder when the second piston rod is raised, and an oil for raising the second piston rod are sent out, while the second piston rod is lowered when the second piston rod is lowered. The second that stores the oil returned from the second hydraulic cylinder
An accumulator, extending up and down, protruding through the upper surface of the casing, being pushed up when the second piston rod of the second hydraulic cylinder is raised, and connecting the remote control unit and the excavating body unit with the second 1 has a rod pushed down by downward operation of the piston rod,
When the rod is pushed down, an intermediate pushing part that pushes down the second piston rod, and in the casing,
When the weight is lowered relative to the casing together with the lifting wire, the weight is engaged with the weight to switch to a state in which pressure oil is sent from the second accumulator to the second hydraulic cylinder. A drilling rig comprising a valve.