JPH0711937Y2 - Wire tension holding device for wire saw - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire saw used for cutting structures such as the ground, rebars, and steel reinforced concrete, and more particularly to a device for always keeping the tension of an endless steel wire constant.

[0002]

2. Description of the Related Art Conventionally, in order to cut a structure such as steel reinforced concrete with a wire saw, as shown in FIG. 2, a spacer 11 made of a compression coil spring and a sleeve 1 are used.
The beads 13 are fixed to the beads 13 through the entire circumference of the endless steel wire 14 by a fixing means such as caulking.

Then, as shown in FIG. 3, a steel wire 14 is wound around a reinforced concrete 19 as an object to be cut through a drive pulley 16 of a motor drive device 15 and a plurality of guide pulleys 17. After that, the drive pulley 16 of the motor drive device 15 is rotated, and the motor drive device 15 is moved in the left-right direction or the up-down direction as the cutting progresses, and the worker finely adjusts the tension of the steel wire 14 visually. Was kept constant and cutting work was performed.

[0004]

However, in the above-described wire saw cutting method, as the cutting work progresses, the operator does not change the cutting line of the steel wire with respect to the object to be cut or the tension change due to foreign matter cutting. There are drawbacks in that the fine adjustment cannot sufficiently follow, and the steel wire is overloaded due to the speed at which the drive device is moved, and the outer wire is broken.

The present invention has been made in view of the above problems, and when cutting an object to be cut such as concrete with a wire, a wire tension for keeping the tension of the wire constant in order to smoothly advance the cutting work. An object is to provide a holding device.

[0006]

The object of the present invention to solve the above problems and achieve the above objects is to provide an endless steel wire with beads having a spacer and a diamond abrasive grain layer for cutting all around the wire. In a wire saw for cutting a structure such as concrete by rotating the steel wire at a high speed with a drive pulley and a plurality of guide pulleys connected to the motor, the drive pulley and a motor for rotating the drive pulley. Is slidable with respect to the housing supporting them, and the drive pulley is applied with a load in the sliding direction so as to give a constant tension to the steel wire, and responds to a change in tension of the steel wire. It depends on what you can do.

[0007]

With this tension holding device, when the wire is overloaded while the object to be cut is being cut by the wire saw,
The drive pulley is appropriately moved in the sliding direction in order to alleviate the change in tension, and the tension of the wire is kept constant.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a front view of a wire tension holding device for a wire saw according to the present invention. In the drawings, reference numeral 1 indicates a wire tension holding device in a wire saw, 2 is a drive pulley for rotating a wire, 3 is a drive motor for rotating the drive pulley, and 4 is a drive pulley and a motor for supporting the drive pulley. A frame, 5 is a wire saw casing, 6 is a steel wire, 7 is a guide pulley, 8 is a compression spring that gives tension to the wire, and 9 is a concrete structure that is an object to be cut.

Wire tension holding device 1 for a wire saw
Is a drive pulley 2 and a motor 3 for rotating the drive pulley 2.
The frame body 4 that supports and is slidable with respect to the housing 5.

A compression spring 8 is interposed between the end of the frame 4 and the end of the housing 5, and the elastic force of this spring causes
The frame body 4 is constantly urged upward in the plane of FIG.

In this way, the steel wire 6 is wound around the housing 5 endlessly through the guide pulleys 7, 7. Then, the motor 3 is rotated, and the steel wire 6 is rotated at high speed by the drive pulley 2. The cutting work is performed by bringing the cutting action portion 6a of the steel wire 6 into contact with the object to be cut 9 and further advancing the housing 5 downward in the plane of FIG.

In this cutting operation, if the casing 5 moves too fast, the steel wire 6 becomes a semicircular curve as shown by the broken line in FIG. 1 due to an increase in cutting resistance of the object to be cut. As the tension of the steel wire 6 increases, the compression spring 8 contracts in response to this, and the drive pulley 2 moves downward to cause the steel wire 6 to sag. Is reduced to a constant tension.

The slack tension of the steel wire 6 decreases as the cutting progresses and the curve of the steel wire 6 approaches a substantially linear shape. The elastic body of the compression spring 8 pushes the frame body 4 upward, and the drive pulley 2 is moved upward to increase the tension of the steel wire 6. As a result, the endless steel wire 6 always receives a constant tension.

By the wire tension holding device 1 in the wire saw of the present invention, the compression spring behaves in accordance with the change in the tension of the steel wire 6, and the tension of the steel wire 6 is kept constant.

As a method for keeping the tension of the steel wire 6 constant, a tension spring may be used in addition to the compression spring, or a predetermined weight may be attached via a rope or the like. As a matter of course, the frame 4 may be suspended.

[0016]

As described above, the wire tension holding device in the wire saw of the present invention is configured such that the drive pulley and the motor for rotating the drive pulley are slidable with respect to the housing supporting them. Since the driving pulley is adapted to apply a load to the steel wire in the sliding direction so as to respond to a change in the tension of the steel wire, the tension of the wire is always kept constant and cut. Wire breakage due to overload during work was prevented, the burden on workers was reduced, labor was saved, and work efficiency was improved.

[Brief description of drawings]

FIG. 1 is a front view according to the present invention.

FIG. 2 is a front view of a wire according to a conventional example.

FIG. 3 is a front view showing a usage state of a wire saw according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire tension holding device in a wire saw, 2 Drive pulley for rotating the wire, 3 Motor for driving the drive pulley, 4 Frame for supporting the drive pulley and the motor, 5 Wire saw casing, 6 Steel Wires, 7 guide pulleys, 8 compression springs that give tension to the wires, 9 concrete structures that are the objects to be cut.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Harsunori Yashima Shima 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Shigeru Ogi 1-1-7 Kyobashi, Chuo-ku, Tokyo Toda Construction Incorporated (72) Inventor Yasuhito Terai 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Kinei Miyamori 1-1-7 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Chokichi Yoshihara Toda Construction Co., Ltd. 17-1 Kyobashi, Chuo-ku, Tokyo (72) Inventor Satoshi Uebayashi 1-7 Toyo Construction Kyobashi, Chuo-ku, Tokyo (56) ) References Japanese Patent Publication No. 35-5576 (JP, B1) Japanese Patent Publication No. 3-11885 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. An endless steel wire is provided with spacers and beads having a diamond abrasive grain layer for cutting all around the end, and the steel wire is connected to a drive pulley and a plurality of guides. In a wire saw that rotates at high speed with a pulley to cut a structure such as concrete, the drive pulley and a motor for rotating the drive are slidable with respect to a housing supporting them. A wire tension holding device for a wire saw, wherein a load is applied in a sliding direction so as to give a constant tension to the steel wire, and the steel wire is made to respond to a change in tension of the steel wire.