JPS6340920B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chucking device for gripping material to be gripped such as shoring in a shoring assembling apparatus for tunnels etc. To provide a chucking device in a shoring assembly device which can grip a gripped material reliably and quickly, can safely release it, and can perform assembling work safely by gripping it strongly.

An embodiment of the present invention will be described below with reference to the drawings.

1 to 3, reference numeral 1 denotes a frame connected to a tunnel boring machine, and two horizontal frames 2 are attached so as to be movable up and down. A box 3 is slidably disposed between the two horizontal frames 2, and by rotating a screw 4 passed through the box 3, the first
It is designed to be moved horizontally in the diagram. An operating shaft 5 consisting of a spline shaft is protruded from the center of the front face of the box 3 so that it can move forward and backward. A jack 7 is fixed horizontally.
The swivel 6 is attached to the tip of the telescopic jack 8, and is connected to the operating shaft 5, that is, the jack 7.
The world is starting to advance or retreat. Further, a handle 9 is disposed on the rear side of the box 3, and is connected to rotate the operating shaft 5 through a transmission means, for example, a combination of a worm and a worm gear (not shown). There is.

A chuck 10 is attached to the tip of the chuck jack 7, and as shown in FIG. 4, a pair of hook members 12 are rotatably attached to the left and right sides of the base plate 11 by a pivot shaft 12a. ing. The left and right hook members 12 are connected by an opening/closing jack 13.
In the contracted state, the tip claws 12b of both hook members 12 are closed inward and gripped as shown by the solid line, while in the extended state, the claws 12b of both the hook members 12 are in the grip position as shown by the imaginary line. It is now located in a released state. A pressing jack 14 is arranged on the base plate 11 between the left and right hook members 12, and its piston rod 14a extends or retreats to grip or release the H-shaped steel S in cooperation with the hook member 12. I'm starting to do that.

FIG. 5 shows a hydraulic circuit for gripping and releasing the opening/closing jack 13 and the pressing jack 14.
5, the hydraulic pump 16 and the oil tank 19 are connected, and a relief valve 23 is provided in the middle of the pipe line 22 between the switching valve 15 and the hydraulic pump 16, and
In the middle of the pipe 18 connected to the piston rod side oil chamber of the opening/closing jack 13, the cylinder side oil chamber of the pressing jack 14 is connected via a sequence valve 21.
A compression spring 20 is provided in the oil chamber on the piston rod side of No. 4. Reference numeral 21a is a check valve, which is arranged in parallel with the sequence valve 21 described above.

The hydraulic pump 16 is provided with an oil tank 19', and the relief valve 23 is provided with an oil tank 19'.
9″ is provided.

Since the chucking device of this embodiment is constructed as described above, first, the 4-port 3-position switching valve 15 of the hydraulic circuit shown in FIG. 5 is switched to the right (release position) as shown by the solid line arrow. , a hydraulic pump 1 rotatably driven by the power unit of the excavator, etc.
Hydraulic oil discharged from 6 flows into the cylinder side oil chamber of the opening/closing jack 13 through the pipe 17,
The piston rod 13a is extended to open the hook member 12 to the left and right. The piston rod 1
3a, the hydraulic oil in the oil chamber on the piston rod side flows into the oil tank 19 through the pipe line 18, and since the pipe line 18 is in a low pressure state, the operation in the oil chamber on the cylinder side of the pressing jack 14 is reduced. Oil too
Due to the compression spring 20, the oil flows into the oil tank 19 via the check valve 21a and the pipe line 18, and the piston rod 14a contracts.

After introducing the H-shaped steel S into the chuck 10 which has been released to the grasping ready state (phantom line in Fig. 4) through the above operations, the switching valve 15 is switched to the left (gripping position) as indicated by the dotted line arrow. and hydraulic pump 1
The hydraulic oil from 6 passes through the pipe 18 and first enters the piston rod side oil chamber of the opening/closing jack 13, causing the piston rod 13a to contract. When the piston rod 13a contracts, the hook member 12
It closes from the virtual line state in FIG. 4 to the solid line state, and the tip claw 12b engages with the back side of the H-shaped steel S.

When the piston rod 13a of the opening/closing jack 13 contracts, the hydraulic oil sequence valve 2 in the pipe line 18
1, it flows into the cylinder-side oil chamber of the pressing jack 14, and causes the piston rod 14a to extend.

When the piston rod 14a extends, its tip surface presses the front surface of the H-shaped steel S, and cooperates with the tip claw 12b engaged from the back surface of the H-shaped steel S.
Firmly grasp the flange portion of the shaped steel S.

As described above, the chucking 10 is made of H-shaped steel S.
When gripped, the horizontal frame 2 is moved up and down, the box 3 is moved horizontally, the operating shaft 5 is advanced to move the chuck 10 to an appropriate position, and the operating shaft 5 is rotated to move the chuck 10 to the appropriate position. Open the jack 7 in a desired direction and expand and contract to set the H-shaped steel S in the assembly position.

When the setting of the H-shaped steel S is completed, next, the 4-port 3-position switching valve 15 is switched to the direction of the solid arrow line (release position). When the switching valve 15 is switched to the release position, the hydraulic oil of the hydraulic pump 16 tries to flow into the cylinder side oil chamber of the opening/closing jack 13 through the pipe 17, but the tip claw 12b of the hook member 12 is Since the piston rod 13a is strongly engaged with the back surface of the steel section S and has a large pullback resistance, the piston rod 13a cannot move, so that the hydraulic oil flows from the relief valve 23 into the oil tank 19''.

On the other hand, when the switching valve 15 is switched to the open position, the pipe line 18 communicates with the oil tank 19.
Due to the action of the compression spring 20, the pressing jack 14
Pressure oil in the cylinder-side oil chamber flows into the oil tank 19 from the pipe line 18 via the check valve 21a, and the piston rod 14a contracts and leaves the front surface of the H-shaped steel S that it is gripping. piston rod 1
When the front end surface of 4a separates from the H-shaped steel S, the tip claw 1 that was engaged with the back surface of the H-shaped steel S cooperates with this.
2b is loosened and the pullback resistance is reduced, the piston rod 13a becomes movable, and the hydraulic oil from the hydraulic pump 16 that had been flowing into the relief valve 23 flows into the cylinder side oil chamber of the opening/closing jack 13. The piston rod 13a is extended and the hook member 12 is pushed open to completely release the H-shaped steel S.

Incidentally, the chucking jack 7 and the pressing jack 14 may be integrally constituted by a double jack.

According to the structure of the present invention, when gripping a material to be gripped, the opening/closing jack is first operated to move the tip tab of the hook member inward, and after the gripping is ready, the pressing jack is activated. The piston rod is activated in sequence to extend the piston rod and grip the material in cooperation with the tip claw, so that the tip claw reliably and safely engages the material to be gripped and then the material is gripped safely and firmly. Not only is it possible to do this, but when releasing, the tip claw is opened after the pressing force of the piston rod of the pressing jack is completely released, so the tip can be released safely without any undue force being applied to the tip claw or the material to be gripped. This has the advantage that there is no fear that the tip claw or the material to be gripped will be damaged or destroyed.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a shoring assembly apparatus having a chucking device of the present invention, FIG. 2 is a plan view taken from the - line cut plane in FIG.
The figure is a side sectional view taken along the line - in FIG. 1, FIG. 4 is an explanatory diagram of the operation of the chucking device, and FIG. 5 is a hydraulic circuit thereof. 1... Frame, 2... Horizontal frame, 3... Box, 4... Screw, 5... Operating shaft, 6... Swivel, 7... Chucking jack, 8... Telescopic jack, 9... Handle, 10... Chucking, 1
DESCRIPTION OF SYMBOLS 1... Board, 12... Hook member, 12a... Pivoting shaft,
12b...Tip claw, 13...Opening/closing jack, 13
a... Piston rod, 14... Pressing jack, 1
4a...Piston rod, 15...4 port 3 position switching valve, 16...Hydraulic pump, 17, 18...Pipe line, 1
9, 19', 19''...oil tank, 20...compression spring,
21...Sequence valve, 21a...Check valve, 22...Pipe line, 23...Relief valve, S...H type steel.

Claims (1)

[Claims] 1. A pair of hook members 12 whose tip claws 12b face each other inwardly, and an opening/closing jack 13 connected between these hook members 12 to operate the opening/closing operation.
and a pressing jack 14 located approximately in the middle of the pair of hook members 12 and pressing the material to be grasped, such as shoring, between the tip claw 12b. Two pipe lines 17, 18 and 4 port 3 position switching valve 1
5, the hydraulic pump 16 and the oil tank 19 are connected to each other, and a relief valve 23 is provided in the middle of the pipe line 22 between the switching valve 15 and the hydraulic pump 16, and a relief valve 23 is provided in the piston rod side oil chamber of the opening/closing jack 13. The cylinder side oil chamber of the pressing jack 14 is connected to the middle of the connected pipe line 18 via a sequence valve 21 in which a check valve 21a is arranged in parallel, and the piston rod side oil chamber of the pressing jack 14 is connected to the cylinder side oil chamber of the pressing jack 14. A chucking device in a shoring assembly device characterized by being provided with a compression spring 20.