JP5061338B2 - Chuck device for all swivel casing push-in / pull-out machines - Google Patents

Description

  The present invention relates to an automatic centering mechanism for a rotating body chuck portion in a fully swivel casing pushing / pulling machine.

  In the all-swivel casing pushing / pulling machine, a casing having an excavating blade at the tip is rotationally press-fitted / pulled into the ground. Such an apparatus is provided with a chuck device that chucks the casing and transmits the rotational force of the rotation driving motor of the casing to the casing. That is, such a swivel pushing / pulling machine for the casing chucks the casing, operates the lifting frame in the downward or upward direction by the press-fit cylinder, and applies a push-in force by rotation by the hydraulic motor. After press-fitting / pulling for one stroke, turn is stopped, the chuck is released, the press-fit cylinder is restored to its original height, the casing is chucked, and the press-fit cylinder is operated in the descending or raising direction. The operation of pushing and withdrawing is repeatedly performed by rotation by the hydraulic motor, and the casing is rotationally pressed and withdrawn from the ground.

  The chuck device used in such an apparatus comprises a semicircular arc-shaped fixed band, a movable band swingably attached to both ends of the fixed band, and a hydraulic cylinder that opens and closes the movable band. The casing is chucked by tightening the movable band, and the casing is concentric with the rotating mechanism to chuck along the fixed band. However, when the chuck mechanism is opened and the rotating mechanism is moved up and down, the fixed band There is a drawback that the casing in contact with the surface is damaged. Moreover, when there is a protrusion on the casing, there is a fatal defect that the casing cannot contact and pass through. (See Patent Document 1)

Also, unlike the above method, a system in which the casing is chucked by four hydraulic cylinders from four sides has been proposed as a method that can be applied even to a casing having protrusions and blades on the outer periphery of the casing.
However, this method has a drawback that it is difficult to make the mounting casing concentric with the rotating mechanism because the four hydraulic cylinders operate with a slight time difference. (See Patent Document 2)
Although there is a method of synchronizing the cylinders, there are drawbacks that errors are accumulated, it is difficult to maintain the core, and the structure is complicated.
JP-A-5-331853 JP 2003-138563 A

Therefore, the present invention has been made with an object to enable automatic alignment of the rotation mechanism and the mounting casing.

Means to solve the problem

  As a means for solving the above-mentioned problems, the present invention closes the movable band on the alignment side first of the two pairs of movable bands that chuck and open the outer periphery of the casing by pressing and separating from the casing, and tightening side. The casing chuck mechanism is characterized in that the movable band is closed later than the previously-adjusted movable band on the alignment side.

Effect of the invention

According to the apparatus of the present invention, even in a casing with an intermediate protrusion and a casing with blades, the chuck device can be moved up and down without damaging the casing because the casing is opened in all directions. Automatic alignment can be achieved throughout the construction without causing any difficulty in alignment due to error accumulation during chucking.
Furthermore, when both ends of the closed-centering adjustable side movable band are used as pressure contact stop surfaces during closing, it must be repaired to the centering-side movable band, which requires troublesome alignment due to wear or the like. In the case of the stopper method, it can be done simply by replacing the stopper.

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 is a plan view showing a fully swivel casing pushing / pulling machine 1 attached with a chuck device 6 of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is an enlarged plan view of the chuck device 6 of the present invention. ((3-1) is when the chuck is fully opened, (3-2) when the chuck is half open, and (3-3) is when the chuck is fully closed), and FIG. 4 is a hydraulic circuit diagram of the chuck device.

  This all-swivel casing pushing / pulling machine 1 has a rectangular frame base frame 2 having a wide caliber at the center part, four lift cylinders 3... And a substantially rectangular lift having a wide circular window at the center part. The frame 4 is supported so as to be movable up and down, and the tubular support 5 on which the chuck device 6 is mounted is rotatably supported in the window of the lift frame 4. The turning motors 7,... Are installed, and a gear mechanism (not shown) for transmitting the rotation of the turning motors 7,. 8,... Are outriggers provided at four corners of the base frame 2.

  The chuck device 6 is provided with two pairs of movable bands 11, 12, 11, 12 on the alignment side and the tightening side, one end of each of which is a pin 15,... The other end is connected to the base of the alignment cylinder 9 and the tightening cylinder 10 and the end of the piston rod by pins 16, 17, 18, 19.

  As shown in FIG. 1, each of the movable bands 11, 12, 11, 12 is composed of movable bands 11, 12, 11, 12, each having a substantially circular arc, and a chuck opening / closing hydraulic cylinder 9, Ten base portions and end portions of the piston rod are connected by pins 16, 17, 18, and 19, respectively.

And the notch 20 is provided in the cylinder 9 side edge part of the alignment side movable bands 11 and 11, and the stopper 13 is provided in the cylinder 9 side, and the alignment side movable bands 11 and 11 are closed, When the notch 20 and the stopper 13 are pressed against each other, the inner circumference of the alignment-side movable bands 11, 11 is concentrically coincident with the outer circumference of the casing 29.
Although the example in which the stopper 13 according to claim 2 is attached is shown here, the center side movable bands 11 and 11 do not have to be cut at the cylinder 9 side end, and in that case, the closed center side movable band is closed. What is necessary is just to provide so that the inner periphery of the alignment side movable bands 11 and 11 may concentrically correspond with the outer periphery of the casing 29 when a both-ends surface is a press-contact state.

  The inner diameters of the center-side movable bands 11 and 11 and the tightening-side movable bands 12 and 12 in the fully swivel casing pushing / pulling machine when the chuck is fully opened are steel pipe casings with intermediate protrusions 30 or blades (not shown). 29 is formed in such a size that can be inserted and removed.

  The chuck can be opened and closed by the hydraulic circuit shown in FIG. 4. 27 is a hydraulic pump, 22 is a hydraulic oil path switching valve, 25 is a relief valve, 26 and 26 are hydraulic oil line joints, and 23 is A pilot check valve for simultaneously opening and closing the inlet side and the outlet side of the hydraulic oil, 28 is an accumulator, and 24 is a sequence valve for delaying the closing operation of the tightening side cylinder 10 more than the closing operation of the alignment side cylinder 9.

  Next, the operation of the embodiment will be described with reference to FIG.

First, the all-swivel casing pushing / pulling machine 1 is aligned and installed at a desired setting position.
Next, regarding the mounting of the casing 29, as shown in FIG. 3-1, after the chuck device 6 is fully opened and the casing 29 is inserted into the lumens of the movable bands 11, 12, 11, 12 The apparatus 6 is fully closed and the casing 29 is chucked. At this time, even when the casing 29 has protrusions 30 and blades (not shown), the casing 29 can be inserted without any problem because it is formed in a size that can be inserted and removed.

  In the chuck of the casing 29, the hydraulic oil from the hydraulic pump 27 is first sent to the alignment cylinder 9 via the path switching valve 22, and the alignment movable bands 11, 11 are aligned with the alignment movable bands 11, 11. Close until the notch 20 and the stopper 13 are in pressure contact (FIG. 3-2), then the sequence valve 24 is opened, hydraulic oil is sent to the tightening side cylinder 10, and the tightening side movable bands 12, 12 are closed ( 3-3), the chucking of the casing 29 is completed.

  In this way, since the alignment-side movable bands 11 and 11 are closed first, the casing 29 is finally pressed along the alignment-side movable bands 11 and 11 while being pressed against the tightening-side movable bands 12 and 12. Therefore, alignment at a certain position can be achieved.

  Next, the lifting frame is actuated in the downward direction by the press-fitting cylinder 3, and a pushing force is given by turning by the turning motor 7, and the turning is stopped by press-fitting only one stroke of the pressing cylinder 3 into the ground, and the chuck is released. Then, the press-fitting cylinder 3 is returned to the original height. Then, the casing 29 is chucked again, and the press-fitting cylinder 3 is operated in the downward direction, and a pushing force is applied by turning by the turning motor 7, and the operation of pressing into the ground by one stroke of the pressing cylinder 3 is performed several times. Repeat as well.

  Here, the chuck attaching / detaching operation is repeated, but in the operation of releasing the chuck and returning the press-fitting cylinder 3 to the original height, the portion in contact with the casing 29 of the chuck device 6 is fully opened when fully opened, and there is no contact portion. Even when the casing 29 has protrusions 30 and blades (not shown), the casing 29 and the movable bands 11, 12, 11, 12 come into contact with the outer periphery of the casing 29 because the casing 29 and the movable bands 11, 12, 11, 12 are in contact with each other. There will be no scratches.

  Further, since the all-swivel casing pushing / pulling machine 1 is first aligned and installed, the casing 29 is finally attached to the alignment-side movable bands 11 and 11 that are closed first even when the chuck attaching / detaching operation is repeated. Therefore, there is no error accumulation caused by a slight time difference between the hydraulic cylinders, unlike the case where the casing is chucked by four hydraulic cylinders from four sides.

  When the projection 30 of the casing 29 comes to the chuck portion, it is only necessary to press-fit with a short stroke avoiding the stroke instead of one stroke.

  The top view which shows one Embodiment of the full turning casing pushing-in / drawing machine in this invention.   The front view of FIG.   The enlarged plan view of the chuck device of the present invention ((3-1) is when the chuck is fully opened, (3-2) when the chuck is half open, and (3-3) when the chuck is fully closed).   It is a circuit diagram which shows one Embodiment of the hydraulic fluid of the chuck | zipper apparatus in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Full swing casing pushing-in / drawer 3 Lifting cylinder 4 Lifting frame 5 Support stand 6 Chucking device 7 Rotating motor 9 Alignment side hydraulic cylinder 10 Tightening side hydraulic cylinder 11 Alignment side movable band 12 Tightening side movable band 13 Stopper 14 Movable band shaft bracket 15, 16, 17, 18, 19 Pin 20 Notch 23 Pilot check valve 24 Sequence valve 29 Casing 30 Projection

Claims (1)

In a fully swiveling casing push-in / pull-out machine, the inner circumference of the movable band on the alignment side is concentric with the outer circumference of the casing, out of two pairs of movable bands that chuck and release the outer circumference of the casing by pressing against and separating from the casing. A chuck mechanism characterized by that.

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