JP2945320B2 - Workbench elevating device for pile construction machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction work such as an auger drive mechanism and a hammer mechanism which is lifted and lowered along a guide rail provided on a reader, and to an auger drill or pile connection work, maintenance and inspection work, and the like. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workbench elevating device for a pile construction machine that raises and lowers a workbench used.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. Hei 5-331855, a worktable is supported so as to be able to move up and down along a guide frame provided on a side surface of a reader, and a wire having one end fastened to the worktable is connected. After winding around a sheave, it is wound around a winch drum, and the winch drum is rotated by a hydraulic motor to wind up or unwind the work table wire, thereby raising and lowering the work table.

[0003]

The workbench is hung by two workbench wires from the viewpoint of safety, and each workbench wire is wound around two winch drums and is driven by two hydraulic motors. The winch drum can be rotated separately. At this time, when the hydraulic source and the two hydraulic motors are connected via one switching valve so that the hydraulic oil can be simultaneously supplied to and discharged from the two hydraulic motors by switching the switching valve, the hydraulic circuit Can be configured without complexity.

However, with such a configuration, when the work table wire is fastened to the work table and suspended, it is necessary to use only one work table wire in order to confirm that the fastening is securely performed. Is lifted and tension is checked, but when the switching valve is switched, two hydraulic motors rotate simultaneously. Therefore, in a state where the hydraulic piping is provided to only one hydraulic motor, the switching valve is switched to rotate the one hydraulic motor and lift the work table. Then, after the confirmation, replace the hydraulic piping to the other hydraulic motor,
Since the work table is lifted by rotating the other hydraulic motor by switching the switching valve and the fastening is checked, there is a problem that the checking operation is troublesome.

After the confirmation, the two work table wires are simultaneously wound by the two hydraulic motors, so that the load is adjusted so that the load is evenly applied to both work table wires so that the load is not unbalanced. There is a need to. When the switching valve is switched, the two hydraulic motors rotate at the same time, so that the work table is raised and lowered with the load imbalanced. Therefore, there is a problem that adjustment is not easy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a workbench lifting and lowering device for a pile working machine which facilitates suspension adjustment of a workbench by two workbench wires.

[0007]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, in a workbench lifting / lowering device for a pile construction machine that raises / lowers a workbench by a workbench winch along a standing reader, the workbench winch is driven by two hydraulic motors separately. The work table is suspended by two work table wires from the both winch drums, and the two hydraulic motors are connected in parallel to one switching valve connected to a hydraulic pressure source. In addition, there is provided a workbench lifting / lowering device for a pile construction machine, wherein an on-off valve is separately provided between the two hydraulic motors and the switching valve.

[0008] The on-off valve may be a valve that can be opened and closed and that can be variablely throttled.
The on-off valve may be provided on a hydraulic oil return side when the hydraulic motor is rotated in a winding direction.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1 and FIG.
Is a main body of a self-propelled construction machine by a crawler, and a leader 2 is supported by a pair of stays 4 and a catching fork 6 so as to be able to be turned upside down. On the front side of the reader 2, two long first guide rails 8, 10 having a circular cross section are laid along the longitudinal direction (see FIG. 4). , A construction mechanism 12 such as an auger drive mechanism, via a plurality of guide gibs 14, the first guide rail 8,
10 are slidably engaged along.

A suspending sheave 22 is rotatably supported by the construction mechanism 12. One end of a main wire 24 wound around the suspending sheave 22 is fixed to the upper end of the leader 2 and the other end thereof. Is wound around a pair of top sheaves 26 and 28 rotatably supported on the upper part of the reader 2. Further, the main wire 24 is wound around a rotary drum 34 of a main winch 32 provided in the construction machine main body 1 via a sheave 30 rotatably supported in the middle of the reader 2, and driven by the main winch 32. The construction mechanism 12 is configured to be able to move up and down.

A second guide rail 3 having a circular cross section parallel to the first guide rails 8 and 10 is provided on the side surface of the reader 2.
6 and 38 are laid (see FIG. 4), and the second guide rails 36 and 38 are provided via a plurality of guide gibs 40.
The moving table 42 is slidably engaged along the second guide rails 36 and 38.

A mounting table 46 on which an operator can mount is attached to the moving table 42, and one ends of two work table wires 48 and 50 are fastened. The worktable wires 48 and 50 are laid over a pair of worktable sheaves 52 and 54 rotatably supported above the reader 2.

A pair of worktable sheaves 52, 54 are provided on both sides of the reader 2 between the leader 2 and the main wire 24.
The worktable wires 48 and 50 are spaced apart from each other in the vertical direction so as not to contact each other, and are arranged so as to substantially cross each other. Then, the work table wires 48, 50
Extend parallel to the side surface of the reader 2 toward the lower end of the reader 2.

As shown in FIG. 5, the work table wires 48 and 50 are wound around two winch drums 58 and 59 of a work table winch 56 disposed on the catching fork 6. The winch drums 58 and 59 are separately rotatably supported by the winch base 61, respectively.
Each is configured to be rotationally driven by two hydraulic motors 62 and 64. Also, winch base 61
Is detachably attached to the catching fork 6 by a pair of inserted pins 68 and 70. In this embodiment, the work table 60 is formed by the guide give 40, the moving table 42, and the boarding table 46.

As shown in FIG. 6, on the winch base 61, a switching valve 72 connected to a hydraulic source 70 provided on the construction machine main body 1 is provided.
The second supply / discharge flow paths 74 and 76 are connected. Switching valve 72
Is a raised position 7 that communicates the hydraulic pressure source 70 with the first supply / discharge channel 74 and communicates the tank 78 with the second supply / discharge channel 76.
2a, a neutral position 72b for communicating the hydraulic pressure source 70 with the tank 78 and blocking the first and second supply / discharge flow paths 74, 76,
A lower position 72c is provided for communicating the first supply / discharge flow path 74 with the tank 78 and the first supply / discharge flow path 74.

The first and second supply / discharge passages 74 and 76 are branched and connected to two hydraulic motors 62 and 64, respectively.
Two hydraulic motors 62 and 64 are connected to the switching valve 72 in parallel. Check valves 80 and 82 are interposed in the first supply / discharge passage 74 for each of the two hydraulic motors 62 and 64, and the check valves 80 and 82 allow the inflow to the hydraulic motors 62 and 64. Are located in Check valves 84 and 86 are also provided in the second supply / discharge passage 76 for each of the two hydraulic motors 62 and 64.
Numeral 6 is arranged to allow the hydraulic motors 62 and 64 to flow.

The first and second supply / discharge passages 74 and 76 are connected to pilot operation valves 88 and 90 provided for the two hydraulic motors 62 and 64, respectively.
90 connects the first supply / discharge passage 74 to cylinders 92, 94 described below when the operating oil pressure is introduced into the first supply / discharge passage 74, and bypasses the check valves 84, 86 to supply the second supply / discharge passage 74 to the second supply / discharge passage 74. When operating hydraulic pressure is not introduced into the first and second supply / discharge passages 74, 76, the first and second supply / discharge passages are provided when the discharge passage 76 and the hydraulic motors 62, 64 communicate with the ascending positions 88a, 90a. Neutral positions 88b, 90b for blocking the flow paths 74, 76;
The second supply / discharge passage 76 connects the second supply / discharge passage 76 with the cylinders 92 and 94 when the operating oil pressure is introduced, and bypasses the check valves 80 and 82 to connect with the first supply / discharge passage 74. Lowering positions 88c, 90c communicating with the hydraulic motors 62, 64
And

Further, a switching valve 72 is provided in the second supply / discharge passage 76.
Manual opening / closing valves 96 and 98 are interposed between the two hydraulic motors 62 and 64 between the pilot operating valves 88 and 90, respectively. In this embodiment, the manual on-off valves 96 and 98 have the second
A valve that can open and close the supply / discharge channel 76 and that can perform variable throttling, such as a needle valve, is used. still,
It is also possible to use an electromagnetic on-off valve in place of the manual on-off valves 96 and 98.

On the other hand, for each of the winch drums 58 and 59,
Brake mechanisms 100 and 102 are provided. The brake mechanisms 100 and 102 brake the winch drums 58 and 59 by a spring biasing force, and release the spring biasing force when hydraulic oil is supplied to the cylinders 92 and 94. hand,
Winch drums 58, 59 by hydraulic motors 62, 64
Is configured to allow the rotation of.

Next, the operation of the above-described working table lifting / lowering device for a pile construction machine of the present embodiment will be described. First, the worktable 60
When assembling, the two worktable wires 48, 50
Are fastened to the moving table 42, respectively. Then, one of the manual open / close valves 96 is operated to close the valve, and the switching valve 72 is switched to the raised position 72a.

Therefore, the switching valve 72 and the first
Hydraulic motor 64 via supply / discharge flow path 74 and check valve 82
Is supplied with hydraulic oil. Further, the pilot operation valve 90 receives the pilot pressure introduced from the first supply / discharge passage 74 and is switched to the raised position 90 a.
The hydraulic oil is supplied to the brake mechanism 102 from the, and the braking is released by the cylinder 94. Further, the hydraulic motor 64
Is connected to the second supply / discharge flow path 76, and the switching valve 72
The working oil is returned to the tank 78 via the.

Accordingly, the hydraulic motor 64 is driven to rotate, the winch drum 59 is rotated, and the work table wire 50 is wound up. As a result, the work table wire 50 is tensioned, and the work table 60 moves up along the second guide rails 36 and 38. After confirming the fastening of the worktable wire 50,
The switching valve 72 is switched to the neutral position 72b, and the hydraulic motor 6
4 and the supply of hydraulic oil to the brake mechanism 102 is stopped, and the winch drum 59 is braked by the spring urging force.

Next, the manual open / close valve 96 is operated to open the valve, and the other manual open / close valve 98 is operated to close the valve.
The switching valve 72 is switched to the ascending position 72a. Therefore, hydraulic oil is supplied to the hydraulic motor 62 via the first supply / discharge flow path 74 and the check valve 80 as described above.

Also, when the pilot operation valve 88 is in the raised position 8
8a, the braking by the brake mechanism 100 is released, and the hydraulic motor 62 is rotationally driven to rotate the winch drum 58. Therefore, when the work table wire 48 is wound up and wound up from the other work table wire 50, the work table wire 48 is tensioned and the work table 60 is raised.

After confirming the fastening of the worktable wire 48,
Once the switching valve 72 is switched to the neutral position, one of the manual open / close valves 96 is closed, and the other manual open / close valve 98 is opened. At this time, one of the workbench wires 48 is in tension, the switching valve 72 is switched to the raised position 72a, and the hydraulic motor 64 is rotated to wind up the workbench wire 50.

While observing the tension state of one work table wire 48, the work table wire 50 is tensioned, and when the tension states of both work table wires 48, 50 are almost the same,
The switching valve 72 is switched to the neutral position 72b to stop the rotation of the hydraulic motor 64. As a result, the loads on both worktable wires 48 and 50 can be adjusted evenly. Further, in this embodiment, since the manual on-off valves 96 and 98 can be variably throttled, the tension can be easily adjusted by narrowing the opening of the manual on-off valve 98 and gently rotating the hydraulic motor 64. .

On the other hand, when adjusting the rising speed of the worktable 60, first, for example, one of the manual opening / closing valves 96 is closed or its opening degree is greatly reduced. Then, the switching valve 72 is switched to the ascending position 72a, and the hydraulic motor 64 is rotationally driven. At this time, when the other manual opening / closing valve 98 is operated to reduce the opening thereof, the amount of hydraulic oil discharged from the hydraulic motor 64 to the tank 78 via the second supply / discharge flow path 76 and the switching valve 72 is adjusted. Thus, the rotation speed of the hydraulic motor 64 can be adjusted.

By adjusting the opening of the other manual on-off valve 98,
After adjusting the rising speed of the worktable 60 to a predetermined speed, one of the manual open / close valves 96 is operated to open the valve. At this time, the opening of one of the manual opening / closing valves 96 is increased to make the rotation speed of one hydraulic motor 62 faster than the rotation speed of the other hydraulic motor 64. This speed difference causes the worktable wire 48
Rolls up faster.

Then, before the work table wire 48 starts to be tensioned, the opening degree is reduced by operating the manual opening / closing valve 96, the rotation speed of the hydraulic motor 62 is reduced, and the speed difference is gradually reduced. While checking the tension of the worktable wire 48, the manual on-off valve 9
6 to reduce the opening, the wires 48, 50 for both worktables.
Are adjusted so that the tension is the same and the load becomes even. After the load of the work table wires 48 and 50 is adjusted to be equal in this way, the switching valve 72 is switched to the neutral position 72b, and the adjustment is completed.

When the pile hole is constructed, the construction mechanism 12
By rotating an unillustrated auger drill etc.,
The main wire 24 is paid out by the main winch 32. Therefore, the main wire 24 lowers the construction mechanism 12 while being guided by the top sheaves 26 and 28. When the pile hole is excavated to a predetermined depth, the main winch 32 is driven to raise the construction mechanism 12 along the first guide rails 8 and 10.

The attachment and detachment of the construction mechanism 12 and the auger drill,
At the time of maintenance and inspection of the construction mechanism 12, the operator
0, and switches the switching valve 72 to the ascending position 72a.
The hydraulic motors 62 and 64 are driven to rotate, and the work table wires 48 and 50 are wound around the winch drums 58 and 59, and the work table wires 48 and 50 are wound up. The work table wires 48 and 50 are guided by the work table sheaves 52 and 54 to move the work table 60 to the second guide rails 36 and 38.
Rise along.

On the other hand, when the switching valve 72 is switched to the lowered position 72c, the second supply / discharge flow path 76, the manual open / close valves 96, 98,
Hydraulic oil is supplied to hydraulic motors 62 and 64 via check valves 84 and 86. In addition, the pilot operation valves 88, 9
0 is switched to the descending positions 88c and 90c, the braking of the brake mechanisms 100 and 102 is released, and the discharge sides of the hydraulic motors 62 and 64 are connected to the pilot operation valves 88 and 9 respectively.
0, tank 78 via first supply / discharge flow path 74 and switching valve 72
Connected to. Therefore, the hydraulic motors 62 and 64 are driven to rotate, the work table wires 48 and 50 are fed, and the work table 60 is lowered along the second guide rails 36 and 38.

As described above, according to the work table lifting / lowering device for a pile construction machine of this embodiment, the work table 60 is hung by the two work table wires 48 and 50, and the two work table wires 48 and 50 are suspended. 50 are separately driven winch drums 58,
Even if it is wound around 60,
Hydraulic motors 62, 6 connected to the switching valve 72
4 can be rotated separately. Therefore, the fastening of the work table wires 48 and 50 can be confirmed separately, and the load can be easily adjusted to be uniform. Also,
By adjusting the throttle openings of the manual open / close valves 96 and 98, the winding speeds of the work table wires 48 and 50 can be easily adjusted so as to be the same.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0035]

As described above in detail, the work table lifting / lowering apparatus for a pile working machine according to the present invention can be controlled by the open / close valve even when the two work table wires are wound around the separately driven winch drum.
The two hydraulic motors connected to one switching valve can be rotated separately, the fastening of both workbench wires can be checked separately, and the load can be easily adjusted to equalize It has the effect of being able to. Further, by using an on-off valve capable of performing a variable throttling, the degree of opening of both on-off valves can be adjusted to easily adjust the winding speed of both worktable wires to be the same.

[Brief description of the drawings]

FIG. 1 is a front view of a pile construction machine provided with a work bench lifting device for a pile construction machine as one embodiment of the present invention.

FIG. 2 is a right side view of the pile construction machine provided with the pile construction machine worktable lifting / lowering device of the present embodiment.

FIG. 3 is an enlarged left side view of the work table of the present embodiment.

FIG. 4 is an enlarged plan view of a work table according to the present embodiment.

FIG. 5 is an enlarged view of a worktable winch of the present embodiment.

FIG. 6 is a hydraulic circuit diagram of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Construction machine main body 2 ... Leader 8, 10 ... 1st guide rail 12 ... Construction mechanism 24 ... Main wire 32 ... Main winch 48, 50 ... Work table wire 56 ... Work table winch 58, 59 ... Winch drum 60 ... Worktables 62, 64 Hydraulic motor 70 Hydraulic source 72 Switching valve 88, 90 Pilot operation valve 96, 98 Manual open / close valve 100, 102 Brake mechanism

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) E02D 7/16 E02D 7/06 E02D 13/00 E21B 15/00

Claims (3)

(57) [Claims] 1. A workbench elevating device for a pile construction machine for raising and lowering a workbench by a workbench winch along a standing leader, wherein the workbench winches are separately driven by two hydraulic motors. The work table is suspended by two work table wires from the two winch drums, and the two hydraulic motors are arranged in parallel with one switching valve connected to a hydraulic pressure source. A work table elevating device for a pile working machine, wherein an on-off valve is separately provided between the two hydraulic motors and the switching valve. 2. The workbench lifting and lowering device for a pile construction machine according to claim 1, wherein the on-off valve is a valve that can be opened and closed and that can be variablely throttled. 3. The lifting platform for a pile working machine according to claim 1, wherein the on-off valve is provided on a hydraulic oil return side when the hydraulic motor is rotated in a hoisting direction. apparatus.