JPH0623395Y2 - Bolt tightening and loosening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a tightening and loosening device for a bolt provided on a flange.

<Prior Art> A large door or a lid of a heat exchanger provided at an equipment inlet such as a storage container is attached by bolting a flange such as a lid to a flange of the equipment body side.

As an example, FIGS. 3 (a) and 3 (b) show a mounting structure of the lid 3 provided at the equipment carrying-in port 2 of the storage container 1. 2a is a flange provided on the equipment carry-in port 2, 3a is a flange of the lid 3, and both are fastened with a large number of bolts and nuts. Reference numeral 4 in the drawing is a bolt and a nut schematically shown.

By the way, the opening and closing of the lid 3 as described above is performed by loosening or tightening a bolt, but conventionally, this work has been performed exclusively by hand. Then, for bolts located at a high place, the scaffold 5 is assembled, and an operator rides on the scaffold 5 and loosens or tightens each bolt using a tool (ratchet spanner or the like).

<Problems to be conceived or solved> As described above, conventionally, the tightening and loosening of bolts in a large lid or the like has been manually performed by an operator, so even if 6 to 8 workers perform it, Since the number of bolts is large, there is a problem that it takes a considerable amount of time and the tightening force is not constant. In addition, since it is necessary to form a scaffold for bolts at high places, the work is troublesome and dangerous.

<Means for Solving the Problems> In order to solve the above problems, the present invention provides a device for tightening and loosening a bolt inserted into a bolt hole of a flange and a nut screwed with the bolt, And a pair of first holding plates each having a socket fitted to the nut and capable of approaching and separating in the axial direction of the bolt, and a socket fitting to another bolt and a nut, respectively. And a pair of second holding plates that can move toward and away from each other in the axial direction of the bolt, a ratchet wrench provided in at least one of the sockets of the first and second holding plates, and a driving means thereof. A bolt mechanism for fastening and loosening the bolt is configured by including a cylinder mechanism that connects the first and second holding plates to each other so that they can approach and separate from each other.

<Operation> In the above structure, the socket of one holding plate is fitted to the bolt or nut to support the device, and in this state, the other nut or bolt is tightened by the ratchet wrench and its driving means. The movement of the device is performed by moving the first and second holding plates toward and away from each other by a cylinder mechanism.

<Embodiment> FIG. 1 shows a perspective external view of a bolt tightening / loosening device according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) show the entire state in which the device is attached to a flange. The front and sides are shown.

The device 11 is mounted on the joint between the equipment inlet flange 2a and the lid flange 3a.

Reference numeral 12 is a hydraulic (or pneumatic) cylinder mechanism that allows the two cylinder parts 12a and 12b to approach and separate from each other.
A flange 2a is provided below each cylinder portion 12a, 12b.
A pressing roller 13 that can roll on 3a is provided.
Guide shafts 14 and 15 are provided on both sides of each of the cylinder portions 12a and 12b so as to project laterally. Guide shaft 1
Splines and the like are cut at 4, 15 and a rear holding plate 16 as a first holding plate is slidably fitted to the rear guide shaft 14, and the left and right holding plates 16 are clamp cylinders 1.
7, the left and right holding plates 16 are moved toward and away from each other by a clamp cylinder 17. Inside each holding plate 16 are bolts 4 on the flanges 2a, 3a.
A bolt socket 18 is provided which can be fitted to a or a nut (not shown in the figure). Similarly, a front holding plate 19 is slidably fitted to the front guide shaft 15 as a second holding plate, the left and right holding plates 19 are connected by a clamp cylinder 20, and the left and right holding plates 19 are connected by the clamp cylinder 20. It is designed to move away from each other. A bolt socket 21 that can be fitted with a bolt and a nut is provided inside each holding plate 19, and the bolt socket 21 that fits with the bolt is a part of the ratchet wrench 26. Can be exchanged. Handle 27 of ratchet wrench 26
A rod 28 of a hydraulic cylinder 22 as a driving means attached to the holding plate 19 is connected to the.

In FIG. 2 (a), 23 is a hose for supplying pressure oil or air, 24 is a hydraulic / pneumatic unit, and 25 is an operation panel.

The bolt tightening / relaxation device 11 is attached below the flanges 2a, 3a so as to straddle the flanges 2a, 3a. The bolt socket 18 provided on the rear side holding plate 16 is fitted and fixed to the bolt and the nut by the approach of the holding plate 16 due to the shortening operation of the clamp cylinder 17.

From the above state, set the hydraulic cylinder mechanism 12 to the bolt arrangement 1
By extending the stroke corresponding to the pitch and then shortening the clamp cylinder 20, the left and right holding plates 19 on the front side approach each other, and the bolt socket 21
Fit into the nut and bolt respectively.

By operating the ratchet wrench 26 by the hydraulic cylinder 22 in this state, the bolt is automatically tightened. By controlling the ratchet wrench 22 by hydraulic drive, the bolt will be tightened with a constant torque.

After this, the hydraulic cylinder mechanism 12 and the clamp cylinder 1
By the operation of 7, 20, the fixing position of the bolt socket 18 of the rear side holding plate 16 is shifted by one pitch, and the front side holding plate 1
By shifting the 9th bolt socket 21 by one pitch, the next bolt can be tightened.

The movement of the device 11 by the hydraulic cylinder mechanism 12 is performed sequentially by the limit switch and the stopper. Further, the pressing roller 1 is attached to the rear cylinder portion 12a.
3 is provided, the force that the cylinder portions 12a and 12b try to rotate is limited to the pressing roller 13 and the flanges 2a and 3a.
The cylinder portions 12a, 12b are prevented from rotating by being received by contact with the cylinder portions 12a, 12b.

When the bolt is loosened by the device 11, the same operation as described above is performed, but the bolt socket 21 of the ratchet wrench 26 is replaced with one in which the ratchet works in the opposite direction.

The operation of the device 11 is performed remotely by the operator operating the operation panel 25 on the ground.

<Effect of the Invention> According to the bolt tightening and loosening device of the present invention, the following effects can be obtained.

Since it can be moved remotely and automatically, tightening or loosening of bolts at high places can be performed easily and safely.

The device configuration is compact and does not occupy a work space.

The bolt can be tightened or loosened automatically with a constant torque.

The device can be attached to and detached from the flange at a low position and will not fall even if it is turned over.

Significant reduction in work personnel can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a bolt tightening and loosening device according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are a front view and a side view of a condition in which the device is attached to a flange, and FIG. (a) and (b) are a side view and a front view of a lid of a storage container or the like. In the drawings, 1 is a containment vessel, 2 is a device inlet, 2a is a flange, 3 is a lid, 3a is a flange, 11 is a bolt tightening / relaxing device, 12 is a cylinder mechanism, 13 is a press roller, and 14 and 15 are guide shafts. Reference numeral 16 is a rear holding plate, 17 and 20 are clamp cylinders, 18 is a bolt socket, 19 is a front holding plate, 21 is a bolt socket, 22 is a hydraulic cylinder, 24 is a hydraulic / pneumatic unit, 25 is an operation panel, and 26 is a ratchet. It's a wrench.

Claims (1)

[Scope of utility model registration request] 1. A device for tightening and loosening a bolt inserted into a bolt hole of a flange and a nut screwed to the bolt, each of which has a socket for fitting the bolt and the nut, and a shaft of the bolt. Has a pair of first holding plates that can move toward and away from each other in the direction, and sockets that fit into other bolts and nuts, and can move toward and away from each other in the axial direction of the bolt. The pair of second holding plates, the ratchet wrench provided in at least one of the sockets of the first and second holding plates and the driving means therefor, and the first and second holding plates can be moved toward and away from each other. And a cylinder mechanism coupled to the bolt mechanism.