JPH06254731A - Bolt fastening device - Google Patents

Abstract

PURPOSE:To fasten a large-diameter bolt with excellent workability by restricting the movement in the peripheral direction of a fitting/removing mechanism with an inner periphery end section, and providing balls movable in the radial direction. CONSTITUTION:Only the portions of the ball contact sections of a small bolt 12 connecting a stud bolt and a rotation drive section are chamfered. The small bolt 12 can be fitted or removed when balls 13 are moved in the radial direction. The fitting/removing mechanism first cup 14 can be moved in the peripheral direction, and the small bolt 12 can be removed when positions of ball holes of the fitting/removing mechanism first cup 14 and a fitting/removing mechanism second cup 15 coincide. When the holes are shifted, the balls 13 are pressed to the chamfered portions of the small bolt 12 to fix it. When the heavy large- diameter bolt is automatically fastened, a fitting/removing device suitable for assembling a large article is provided, and the efficiency of the work can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt attaching / detaching mechanism for fastening a bolt, and more particularly to a bolt fastening device suitable for fastening a large diameter stud into a screw hole of a machine body.

[0002]

2. Description of the Related Art A conventional device is disclosed in, for example, Japanese Patent Laid-Open No. 59-2242.
As disclosed in Japanese Patent No. 24, there is a device in which motors are respectively provided in three axial directions and tightened automatically.

[0003]

Since the above-mentioned prior art is a device for fastening bolts after aligning in the three axial directions, the amount of deviation of the bolt shaft core from the screw hole shaft core is automatically detected. There was a problem that the mechanism of became complicated.

An object of the present invention is to provide a bolt fastening device that fastens large-diameter bolts with excellent workability.

[0005]

To achieve the above object, the present invention comprises an attaching / detaching mechanism for fastening a bolt, a rotating mechanism for applying a rotational force to the attaching / detaching mechanism, the rotating mechanism and a drive mechanism. In the bolt fastening device, the attachment / detachment mechanism is provided at the end of the inner peripheral surface with a ball that is restricted in the circumferential direction and is movable in the radial direction.

[0006]

The attachment / detachment mechanism has a first cup and a second cup having an opening at one end, and the inner surface of the first cup has a polygonal surface into which the bolt head is inserted. A gap is formed between the first cup and the second cup, and a polygonal surface into which the bolt head is inserted is formed on the inner peripheral surface of the first cup. When a through hole is formed in the corner of the polygonal surface and the corresponding second cup and the bolt head is inserted into the first cup, it moves to the through hole side in the second cup, and when not inserted, the first cup Is inserted into the through hole, and the second cup is rotated to cover a part of the through hole of the second cup. When inserting the bolt into the first cup and moving the rotary feed mechanism to the bolt side, the ball moves from the bolt head to the through hole side of the second cup and moves further by guiding the second cup. When it comes to the threaded portion, the ball moves to the side of the through hole of the first cup, so that the bolt does not come off even if it is attached to the first cup and rotated. When the bolt head is removed from the first cup, the second cup is rotated so that part of the ball comes out of the outer through hole.If the feed mechanism rotates in the opposite direction, the ball is pushed by the bolt head It jumps out to the side of the through hole and the first cup moves to its original position leaving the bolt head.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a vertical sectional front view of this apparatus. The crane can move the bolt freely to the position of the screw hole of the work by carrying this screw tightening device. At that time, the hexagonal rod 4 is equipped with a ratchet 10,
The first few rotations are manually screwed in and then rotary driven. The rotation of the hexagonal rod 4 is stabilized by the bearing 6 and the rotating body 5.

FIG. 2 is an enlarged view of the bolt attaching / detaching mechanism.
The small bolt that connects the stud and the rotary drive is chamfered only at the ball contact part. Where the ball 13
Can be attached and detached by moving in the radial direction.

FIG. 3 is a sectional view taken along the line III-III of FIG. Since the attaching / detaching mechanism first cup 14 can move in the circumferential direction, the small bolt 12 can be removed when the positions of the ball holes of the attaching / detaching mechanism first cup 14 and the attaching / detaching mechanism second cup 15 coincide. Further, by shifting the holes, the balls 13 are fixed by pressing the chamfered portions of the bolts.

[0010]

According to the present invention, the embedded bolt fastening device has a detachable device suitable for assembling a large article when automatically tightening a large-diameter bolt which is a heavy object. Can be realized.

[Brief description of drawings]

FIG. 1 is a side view of a bolt implanting device according to the present invention.

FIG. 2 is a cross-sectional view of this device.

FIG. 3 is a sectional view taken along the line III-III in FIG.

[Explanation of symbols]

2 ... bolt attaching / detaching mechanism, 12 ... small bolt, 13 ... ball, 14 ... attaching / detaching mechanism first cup, 15 ... attaching / detaching mechanism second cup.

Claims (1)

[Claims] 1. A rotary mechanism, a rotary feed mechanism that moves left and right according to the rotation of the rotary mechanism, and a detachable mechanism that fastens a bolt to the tip of the rotary feed mechanism. In addition, a bolt fastening device characterized in that it is provided with a ball that is restricted from moving in the circumferential direction and is movable in the radial direction.