JPH01268983A - Automatic chuck system rotary driving device - Google Patents

Abstract

PURPOSE:To miniaturize a device without requiring a rotary seal by providing a chuck claw and an engaging block to a piston rod of a chuck claw opening and closing cylinder through bearings and engaging the engaging block and an inclined engagement section of the claw so that they are capable of sliding. CONSTITUTION:An engaging block 45 is provided to the end of a piston rod 52 through a thrust bearing so that it is capable of rotating, and an inclined engagement section 45a of the periphery thereof is fitted to an inclined engagement section 43a of the internal end of each sliding block 43 so that they are capable of sliding. An auger 5 is set between chuck claws 41, when pressure oil is supplied to a chuck claw opening and closing cylinder 48, the rod 52 is moved in the direction of the (a), the engaging block 45 is also moved in the direction of the (a) to engage to the sliding block 43, and the claws 41 are moved in the direction of the (b) to hold the auger 5. When a motor 8 is operated, a bevel gear 36, the engaging block 45, the claws 41 and the auger 5 rotate against a cylinder body 46 and the rod 52 through bearings 53, 54 and 56. According to the constitution, a rotary seal is not required, and longer life of a seal material can be attained.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is used, for example, in horizontal hole excavation equipment for underground pipe construction, in which a cylinder-driven automatic chuck device grips a rotated object such as an auger. The present invention relates to a rotational drive device that rotates the device.

(Prior Art) The present inventors have already developed an apparatus as shown in FIG. 2 as an apparatus for constructing buried pipes such as gas pipes. In this device, a base frame 2 is fixed to the bottom of a groove l excavated along a main management facility such as a road, and a guide frame 3 is attached to the base frame 2 so that the horizontal rotation position can be freely adjusted and the inclination angle can be adjusted. A rotary drive device 6 for an auger 5 is movably installed along a rail 4 installed on the guide frame 3. The rotational drive wave M6 is
It has a rotary chuck device 7 for gripping the auger 5 at the front part,
It also includes a drive motor 8 that rotates the auger 5 via a rotary chuck device 7, and a roller 9 that rolls the auger 5 along the rail 4. Further, the rotary drive device 6 is equipped with a traverse motor 10 for reciprocating the rotary drive device 6 along the rail 4, and a pinion 11 rotated by the traverse motor IO.
a rack 12 provided on the guide frame 3 in parallel with the rail 4;
The rotary drive device 6 is configured to reciprocate along the rail 4 by forward and reverse rotation of the traverse motor 10. A fixed chuck device 13 is attached to the front part of the guide frame 3 for gripping the tail end 5a (femally threaded) of the auger 5 when the auger 5 is attached or detached. The fixed chuck device 13 includes left and right chuck claws 14.15, left and right hydraulic cylinders 16.17, and link mechanisms 18.19 that transmit the movement of the hydraulic cylinders 16.17 to the chuck claws 14.15, respectively. Become.

This device is operated using a hydraulic power source and a control power source provided in a power unit (not shown) placed on the ground. An operation panel 22 for controlling the chuck devices g17, 13, etc. is installed.

This device has a rotary chuck device M7 and a tail end 5a of the auger 5.
After digging into the ground and excavating the length of one auger 5, the rotary chuck device 7 is loosened to remove the auger 5, and the rotary drive device 6 is moved backward to remove the following auger. 5 is gripped by the rotating chuck device 7, and the tail end of the leading auger 5 is gripped by the fixed chuck device 13, while rotating and advancing the trailing auger 5, the male threaded portion 5b at the tip of the trailing auger 5 is Lateral hole excavation is performed by repeating the following operations: screwing into the female threaded portion of the tail end 5a of the leading auger 5, and then moving the auger 5 forward and rotating once to perform excavation.

A conventional rotary drive device 6 is constructed as shown in FIG. In FIG. 3, reference numeral 24 denotes a main body serving as a skeleton of the rotary drive device 6. The drive motor 8 is fixed to the main body 24 with bolts 25, and a first cylindrical body 26 with a flange 26a is fixed to the main body 24 with bolts 27. and fixing the second cylindrical body 28 to the first cylindrical body 26 with bolts 29,
The tube 31 of the chuck jaw opening/closing cylinder 30 is rotatably fitted into these cylindrical bodies 26 and 28 via a bearing 32 and a rotary seal 33. Further, a bevel gear 36 rotatably attached to the main body 24 via a metal bearing 35 is attached to the bevel gear 34 rotated by the drive motor 8.
The bevel gear 36 is fitted onto the tube 31 via the locking key 37, and the retaining ring 38 of the bevel gear 36 is screwed onto the tip of the tube 31. Further, a rotating block 4o is concentrically fixed to the bevel gear 36 with bolts 39, and the rotating block 4o is attached to the rotating block 4o as shown in FIGS.
As shown in the figure, a plurality of (three in the illustrated example) T-shaped grooves 55 are provided radially from the center opening 40a to the outer periphery, and the chuck claws 41 are slidably fitted along each groove 55. match. Each chuck claw 41 is formed by integrally connecting a sliding block 43 slidably fitted into a groove 55 and a claw body 42 that grips a rotated object such as the auger 5 with a bolt 59.

On the other hand, an engagement block 45 is integrally attached to the tip of the piston rod 44a connected to the piston 4'4 of the cylinder 30, and as shown in FIG.
an inclined engagement portion 45a formed of a T-shaped groove provided on the outer periphery of the T-shaped inclined engagement portion 4 provided at the inner end of each sliding block 43;
3a are slidably fitted.

In this device, by supplying pressure oil from the boat 62 (63) to the rod chamber (bottom chamber) of the cylinder 30 for opening and closing the chuck claw, the piston rod 44a and the engagement block 45 are The chuck claw 41 moves toward the center (outer circumferential direction) as shown by the arrow a to grip (release) the auger 5, and the drive motor 8 Due to this rotation, the chuck claw opening/closing cylinder 30 rotates together with the bevel gear 36 relative to the cylindrical body 26,28.

(Problems to be Solved by the Invention) As described above, in the conventional rotary drive device, the cylindrical body 2
6. Since the chuck claw opening/closing cylinder 30 is rotatably mounted on the chuck claw opening/closing cylinder 30 via the rotary seal 33 and the bearing 32, the piston 44 is moved to the right to retract the chuck claw 41 and the auger 5 is gripped. When rotating, use tube 3
1 also rotates via the rotary seal 33, and the rotary seal 3
For example, high pressure exceeding 100 atmospheres is applied to 3, and
A deforming force due to some backlash also acts, and heat is generated due to rotation, so the rotary seal 33 is easily damaged and has a short lifespan.

In order to eliminate such a problem, the working oil pressure of the chuck jaw opening/closing cylinder 30 is reduced.

Since it becomes difficult to obtain the necessary driving force, the equipment must be made larger.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the automatic chuck-type rotary drive device of the present invention has a driving motor for a rotated object and a chuck claw for gripping the rotated object, which are mounted on the rotary drive device main body. an opening/closing cylinder is fixedly installed, a rotating block rotated by the drive motor is rotatably attached to the main body, a chuck claw is attached to the rotating block so as to be movable radially, and a piston rod of the chuck claw opening/closing cylinder is attached to the rotating block. The invention is characterized in that an engagement block for the chuck claw is rotatably mounted via a bearing, and the inclined engagement part of the engagement block and the acid inclined engagement part are slidably engaged. .

(Example) An example of the present invention will be described below with reference to FIG. In FIG. 1, the same reference numerals as in FIGS. 2 to 6 indicate components having the same or equivalent features. Rotary drive device body 2
4, the drive motor 8 of the auger 5, which is a rotating body, is fixed with the bolt 25 as described above. Further, a cylindrical body 46 having a flange 46a is fixed to the main body 24 with a bolt 47, and a tube 49 of a chuck claw opening/closing cylinder 48 is attached to the cylindrical body 46 with a bolt 50 concentrically with the cylindrical body 46.
The piston rod 52 connected to the piston 51 of the chuck jaw opening/closing cylinder is slidably inserted into the cylindrical body 46.

The bevel gear 36 meshed with the output bevel gear 34 of the drive motor 8 is rotatably mounted on the main body 24 via a metal bearing 35 in the same manner as described above, and is radially attached to a cylindrical body 46 fixed to the main body 24. Bearing 53 and thrust bearing 5
4 and is rotatably fitted to the outside. Further, a cylindrical rotary gear 40 is concentrically fixed to the bevel gear 36 by a bolt 39.

On the other hand, an engagement block 45 is rotatably attached to the tip of the piston rod 52 via a thrust bearing 56, and as in the conventional example shown in FIG. The inclined engagement portion 45a and the T-shaped inclined engagement portion 43a provided at the inner end of each sliding block 43 are slidably fitted.

Note that 57 is a lubricating oil supply port provided in the sliding block 43, and a space 58 in which the retaining block 45 moves.
It supplies lubricating oil to the tank and is closed off by a stopper during the second operation. Further, a cover 60 that closes the opening 40a is attached to the front surface of the rotating block 40 with bolts 61.

In this rotary drive device, an auger 5 is set between a plurality of chuck jaws 41, and a cylinder 48 for opening and closing chuck jaws is installed.
When the piston rod 52 is moved in the direction of arrow a by supplying pressure oil to the rod chamber from the boat 62 and discharging the oil in the bottom chamber from the boat 63, the engagement block 45 also moves in the direction of arrow a. Due to the engagement between the engagement block 45 and the sliding block 43, the chuck claw 41 moves toward the center as shown by the arrow and grips the auger 5. If the drive motor 8 is operated in this state, the bevel gear 36, the retaining block 45, the chuck claw 41 and the auger 5 will be moved against the cylindrical body 46 and the piston rod 52.
．． 56. Therefore, all the relative rotating parts are connected via bearings 53, 54, and 56, and there is no need for rotary seals, which were conventionally required.

In the above embodiment, the case where the rotated body is the refill type auger 5 has been described, but it can also be used as a remote control device to which other drilling augers, cleaning tools, or various work implements and tools can be attached and detached. The manner in which the main body 24 is attached to other equipment, etc. can be changed in various ways. In addition, one aspect of the present invention is
The present invention can also be applied when the drive motor 8 is an electric type or when the chuck jaw opening/closing cylinder 48 is a pneumatic type.

(Effects of the Invention) As described above, in the present invention, the cylinder for opening and closing the chuck jaw is fixed to the main body, and the engaging block for opening and closing the chuck jaw is rotatably added to the piston loft via a bearing. , a rotary seal is no longer required, the life of the seal material is extended, and the labor and effort required to replace the seal material of the rotary drive device is eliminated. In addition, non-heat resistant seal materials can be used, and the device Since the configuration is also simple, the cost of the device can be reduced. Furthermore, since a one-turn seal is not required, the pressure of the working fluid can be increased, and the device can be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an automatic chuck type rotary drive device according to the present invention, FIG. 2 is a plan view showing a horizontal hole drilling device in a working state as an example of the device to which the present invention is applied, and FIG. The figure is a sectional view showing a conventional rotary drive device, FIGS. 4 and 5 are views in the direction of arrow A and arrow B in FIG. 3, respectively, and FIG. FIG. 3 is a cross-sectional view showing the engagement structure of FIG.

Claims (1)

[Claims] A drive motor for a rotated object and a cylinder for opening and closing chuck claws for gripping the rotated object are fixedly installed in a rotary drive device main body, a rotary block rotated by the drive motor is rotatably attached to the main body, and a rotary block rotated by the drive motor is rotatably attached to the rotary block. A chuck pawl is attached so as to be movable radially, an engagement block with the chuck pawl is rotatably attached via a bearing to the piston rod of the cylinder for opening and closing the chuck pawl, and the inclined engagement portion of the engagement block and the pawl are connected to each other. An automatic chuck type rotary drive device, characterized in that the slanted engagement portion of the invention is slidably engaged with the inclined engagement portion of the invention.