JP4326717B2 - Spacer mounting device for casing rotary excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a casing rotary excavator mainly used for foundation works of construction and civil engineering, and more particularly to a spacer mounting device interposed between a casing gripping device and a casing.
[0002]
[Prior art]
In the casing rotary excavator, a spacer is interposed between the gripping device and the casing so that the casing of various diameters can be gripped.
[0003]
The spacer is attached to the gripping device by a pin, and the pin is a hooked pin that is mounted from the inner side (center side of the gripping device) to the outer side of the spacer and protrudes from the outer side of the gripping device. The tip of the door is secured and fixed.
[0004]
[Problems to be solved by the invention]
When earth and sand adheres to the gap between the spacer and the casing during excavation and a slip occurs between the casing and the spacer, it is necessary to clean the spacer. However, since the conventional mounting structure is a structure in which the pins are attached from the inner side to the outer side of the spacer, the casing cannot be pulled out and the pins cannot be pulled out while the casing is gripped. For this reason, the casing that has been dug must be extracted once, which is a troublesome and time-consuming operation.
[0005]
Also, if the gripping force decreases due to wear of the spacer or casing and slipping occurs between the spacer and the casing, repair work is also performed to reduce the inner diameter by removing the spacer once and welding a plate or the like to the spacer. However, at that time, it was necessary to remove the casing, which was similarly troublesome and time-consuming.
[0006]
This invention is made in view of the subject mentioned above, and it aims at providing the spacer attachment apparatus of the casing rotary excavation apparatus which can perform the attachment / detachment operation | work of the spacer attached to a casing rotary excavation apparatus easily. To do.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, the spacer mounting device of the casing rotary excavator of the present invention is a casing rotary excavator for press-fitting excavation by gripping and rotating the casing. A through-hole provided from the outside to the inside of the device, a spacer mounted on the inside of the gripping device, a connection hole provided in the spacer and communicating with the through-hole, and an engagement provided in the connection hole A fixing member, a mounting pin that is inserted from the outside to the inside of the gripping device and is inserted into the through hole of the gripping device and the connection hole of the spacer, and the mounting pin is provided at the tip of the mounting pin. Is attached to the base end portion of the mounting pin, and is attached to the base end portion of the mounting pin. It is obtained by a fixing member for inhibiting movement of the said gripping device inside direction of emission.
[0008]
According to a second aspect of the present invention, the spacer locking member comprises a plate provided in the connection hole and a long hole provided in the plate, and the attachment pin removal prevention member is a predetermined part of the attachment pin. The long hole of the plate is allowed to pass through at the rotational position, and the passage of the long hole is prohibited at other than the predetermined rotational position.
[0009]
According to a third aspect of the present invention, a pin detent member that prohibits rotation of the mounting pin is provided in the vicinity of the opening of the through hole outside the gripping device.
[0010]
According to a fourth aspect of the present invention, a grip for performing insertion, extraction, and rotation into the through hole of the gripping device and the connection hole of the spacer is detachably provided at the base end portion of the mounting pin.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a spacer mounting device for a casing rotary excavator of the present invention will be described with reference to FIGS.
[0012]
1 is an overall side view of a casing rotary excavator to which the present invention is applied, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along line BB in FIG. 3, and FIG. 6 is a detailed view of the pin.
[0013]
1 and 2, a casing rotary excavator 1 (hereinafter referred to as a casing driver) includes a base frame 4 that is adjusted to a horizontal position by a jack cylinder 3, guide posts 5 that are made to stand at four corners of the base frame 4, and the base. A rotary drive device 7 that is moved up and down along the guide post 5 by a thrust cylinder 6 having one end attached to the frame 4, and a band device for gripping a casing (not shown) attached to the rotary side portion of the rotary drive device 7. 8.
[0014]
As shown in FIG. 1, the rotary drive device 7 includes a swivel bearing 9 with external teeth, a pinion 10 that meshes with the external teeth of the swivel bearing 9 and rotates the swivel bearing 9, and a planetary speed reducer that drives the pinion 10. And an attached hydraulic motor 11.
[0015]
The band device 8 includes a fixed band 8a and a pair of movable bands 8d connected to the fixed band 8a by a pin 8c so as to be swingable. The fixed band 8a is fixed to an outer race on the rotating body side of the swing bearing 9. A band cylinder 12 is connected to the other end of the movable band 8d, and the cylinder 12 is used to hold and release the casing. Further, when the outer diameter of the casing to be gripped is smaller than the inner diameter of the band device 8, a donut-shaped gap is generated. Therefore, the gap is filled with the spacer 30 so that the casing can be securely gripped by the band device 8.
[0016]
The spacer 30 includes a fixed side spacer 31 attached to the fixed band 8a and two movable side spacers 32 attached to the movable band 8d.
[0017]
Next, the mounting structure of the fixed side spacer 31 and the movable side spacer 32 in the present embodiment will be described in further detail. Since the fixed side spacer 31 and the movable side spacer 32 have the same mounting structure, the fixed side spacer 31 will be described as an example with reference to FIGS.
[0018]
The fixed band 8a is provided with a through hole 34 made of a boss 33 from the outer surface to the inner surface. The fixed side spacer 31 is provided with a connection hole 36 made of a boss 35. The connection hole 36 matches the through hole 34 when the fixed side spacer 31 is attached to the fixed band 8a. A locking member 37 having a long hole 37a as shown in FIG. 5A is fixed in the connection hole 36. (Refer to FIG. 4a.) The through hole 34 and the connection hole 36 have substantially the same diameter.
[0019]
In addition, a hook member 38 having a hook shape in cross-section, which serves as a locking tool for the fixing band 8a when the fixing band 8a is mounted, is provided on the upper side of the fixing side spacer 31. When mounting by lowering from above 8a, the fixed side spacer 31 is locked to the rib LB constituting the fixed band 8a to prevent the dropout, and the through hole 34 and the connection hole 36 are positioned in the vertical direction. Do.
[0020]
The fixed band 8a and the fixed spacer 31 are connected by fitting the mounting pin 40 after aligning the through hole 34 and the connection hole 36.
[0021]
The mounting pin 40 has a main shaft body 41 fitted in the through hole 34 and the connection hole 36 without any gap in the radial direction, and a main shaft body on the tip side of the main shaft body 41 (the side inserted through the through hole 34 and the connection hole 36). 41 is provided via a subshaft body 42 having a smaller diameter than that of 41 and capable of passing through the long hole 37a. The retaining member 43 has substantially the same shape as the long hole 37a of the locking member 37, and the other end side (fixed) The auxiliary shaft body 44 is provided on the band 8 a side and has a smaller diameter than the main shaft body 41. The retaining member 43 can pass through the long hole 37a when it is at a rotational position that is in the same direction as the formation direction of the long hole 37a, and cannot pass through the long hole 37a when it is at a position other than the rotational position. (See FIG. 5b.)
The auxiliary shaft body 44 has a cotter hole 44a formed on the outer surface of the fixed band 8a in the same direction as the direction of forming the retaining member 43, with the retaining member 43 passing through the long hole 37a. A handle attachment hole 44b provided at the end of the shaft and provided with a screw hole is provided.
[0022]
The cotter hole 44a is fitted with the cotter 50 when the mounting pin 40 is inserted into the through hole 34 and the connection hole 36, and the handle mounting hole 44b is formed with a handle 60a and a threaded portion at the tip. A mounting handle 60 including the shaft portion 60b is detachably attached. Further, the boss 33 constituting the through hole 34 is provided with a U-shaped detent member 51 as shown in FIG. 4B, and when the cotter 50 is inserted into the cotter hole 44 a of the mounting pin 40, The distal end portion of the cotter 50 is fitted into the detent member 51 and the cotter 50 prevents the mounting pin 40 from rotating. As a result, the retaining member 43 of the mounting pin 40 passes through the locking member 37, and the retaining member 43 is attached when the elongated hole 37a shown in FIG. 4 and FIG. The cotter 50 that is inserted into the cotter hole 44a of the pin 40 is configured to be in a proper mounting state in which the mounting pin 40 is prevented from coming out by being fitted into the rotation preventing member 51.
[0023]
Next, the attaching operation of the fixed side spacer 31 to the fixed band 8a will be described.
[0024]
First, the stationary spacer 31 is lifted above the stationary band 8a by a crane or the like (not shown). From this state, the fixed side spacer 31 is lowered toward the inside of the fixed band 8a. Then, the flange member 38 of the fixed side spacer 31 is engaged with the rib LB provided on the inner upper side of the fixed band 8a. At this time, the position is lowered while adjusting the position of the connection hole 36 of the fixed side spacer 31 to the position of the through hole 34 of the fixed band 8a. In the state where the collar member 38 is locked to the rib LB of the fixed band 8a, the vertical positions of the through hole 34 and the connection hole 36 are matched, so that the position adjustment is performed in the horizontal direction ( Only the rotation direction). Then, the attachment pin 40 is fitted into the through hole 34 and the connection hole 36 of the fixed spacer 31 from the outside of the fixed band 8a. At this time, the shaft portion 60 b of the mounting handle 60 is screwed into the handle mounting hole 44 b of the auxiliary shaft body 44.
[0025]
When the mounting pin 40 is inserted to some extent, the mounting pin 40 is rotated by the mounting handle 60 so that the direction of the retaining member 43 is aligned with the same position as the long hole 37a of the locking member 37 is formed. In this state, the mounting pin 40 is further inserted, and the retaining member 43 is passed through the long hole 37 a of the locking member 37.
[0026]
Then, the mounting pin 40 is rotated by the mounting handle 60 so that the retaining member 43 does not coincide with the formation direction of the elongated hole 37a of the locking member 37, and the locking member 37 is moved to the main shaft body 41 of the mounting pin 40 and the retaining member. 37, and the mounting pin 40 is fixed to the fixed side spacer 31.
[0027]
Thereafter, the cotter 50 is fitted into the cotter hole 44a of the auxiliary shaft body 44, and the tip end portion of the cotter 50 is fitted into the anti-rotation member 51 to fix the mounting pin 40 to the fixing band 8a (inwardly of the fixing band 8a). The movement and rotation of the fixed side spacer 31 are completed. Since the cotter 50 has a wedge shape, it has an action of moving the mounting pin 40 in the direction of pulling out to the fixed band 8a side by fitting, so that the fixed side spacer 31 is pressed against the fixed band 8a by the mounting pin 40 and there is no play. It becomes possible to fix firmly. Furthermore, since the cotter 50 is fitted into the rotation preventing member 51, it is possible to prevent the cotter 50 from coming off or rotating together with the mounting pin 40, and the mounting pin 40 can be reliably prevented from coming off.
[0028]
The removal work of the fixed side spacer 31 from the fixed band 8a may be performed in the reverse order of the above-described procedure.
[0029]
Further, since the attachment structure of the movable spacer 32 and the movable band 8d has the same structure as described above, it can be operated in the same manner.
[0030]
According to this, since the attaching and detaching operations of the fixed side spacer 31 and the movable side spacer 32 can be performed outside the fixed band 8a and the movable band 8d, a working space can be secured and whether the casing is attached or not. The workability can be improved.
[0031]
【The invention's effect】
Since the spacer mounting device of the casing rotary excavator of the present invention is configured as described above, the spacer can be attached and detached from the outside of the gripping device, so that workability can be improved.
[Brief description of the drawings]
FIG. 1 is an overall side view of a casing rotary excavator to which a spacer mounting device of a casing rotary excavator of the present invention is applied.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4A is an enlarged view of a main part a of FIG. 3, and FIG. 4B is a cross-sectional view taken along line C of FIG.
5A is a cross-sectional view taken along line BB in FIG. 3, and FIG. 5B is a state diagram illustrating a state in which a retaining portion 43 of the mounting pin 40 is locked in FIGS.
FIG. 6 is a detailed view of a pin.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1; Casing driver, 8; Band apparatus, 8a; Fixed band, 8d; Movable frequency, 31; Fixed side spacer, 32; Movable side spacer, 33, 35; Boss, 34; Locking member 37a; long hole 40; mounting pin 43; retaining member 50; cotter 51; anti-rotation member 60; mounting handle.

Claims (4)

In the casing rotary excavator for holding and rotating the casing and press-fitting excavation,
A through hole provided from the outside to the inside of the gripping device for gripping the casing;
A spacer mounted on the inner side of the gripping device;
A connection hole provided in the spacer, communicating with the through hole, and a locking member provided in the connection hole;
A mounting pin that is inserted from the outside to the inside of the gripping device and is inserted into the through hole of the gripping device and the connection hole of the spacer;
A slip-off preventing member that is provided at a tip portion of the mounting pin, and is locked to the locking member of the spacer when the mounting pin is fitted and inserted into the through hole and the connection hole,
A spacer mounting device for a casing rotary excavator, comprising: a fixing member that is attached to a base end portion of the mounting pin and prohibits movement of the mounting pin toward the inside of the gripping device. The spacer locking member comprises a plate provided in the connection hole and a long hole provided in the plate,
The attachment pin removal prevention member has a structure in which passage of the long hole of the plate is permitted at a predetermined rotation position of the attachment pin and passage of the long hole is prohibited at a position other than the predetermined rotation position. The spacer mounting apparatus for a casing rotary excavator according to claim 1.   The spacer mounting of the casing rotary excavator according to claim 1 or 2, wherein a pin detent member for prohibiting rotation of the mounting pin is provided in the vicinity of the opening of the through hole outside the gripping device. apparatus.   The gripping device for inserting, pulling out and rotating the through hole of the gripping device and the connection hole of the spacer is detachably provided at the base end portion of the mounting pin. The spacer mounting apparatus of the casing rotary excavator of any one of Claims.

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