JPH084252Y2 - Safety 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 safety device used for cutting stone materials and reinforced concrete structures.

[0002]

2. Description of the Related Art The wire saw method is a method of cutting a reinforced concrete structure or a stone material by using a wire saw in which beads having electrodeposited or sintered granular diamond are attached to a wire. 53426
It is disclosed in Japanese Patent Publication No. 1-53427 and Japanese Patent Publication No. 53427/1989, and has the advantage that high efficiency cutting is possible and there is little influence on the surrounding environment.

By the way, in this type of construction method, a wire saw is wound around an object to be cut, such as reinforced concrete, and the wire saw is frictionally traveled by a drive pulley. An accident in which the wire saw is cut occurs due to caulking at the joint portion of the wire saw.
Of these causes of wire saw cutting, defective crimping of the joint can be solved by strict checking before work, etc., but when foreign matter etc. cuts into the cutting part and cutting resistance increases, cutting Is in a very difficult situation to predict.

The cutting of the wire saw due to the non-uniformity of cutting resistance usually occurs on the tension side of the wire saw.
If excessive tension is applied to the wire saw, it will be cut from the part with a large cutting resistance, but if the wire saw is cut in such a state, the wire saw will fly like a whip and fly to the drive pulley side, Harm to.

To address this problem, for example, Japanese Patent Publication No. 10955/1992 discloses a construction method in which a tunnel-shaped or tubular protection fence is provided on the outer circumference of a wire saw to be circulated. According to the construction method disclosed in this publication, the safety of workers and the like is secured, but there are technical problems described below.

[0006]

[Problems to be Solved by the Invention] That is, in the method disclosed in the above publication, a tunnel-shaped or tubular protective fence is installed on the outer periphery of the wire saw, and therefore, when the wire saw is cut, the fence is prevented from coming in. However, in the actual construction, as the cutting progresses, the guide pulley is rescaled, and the cutting direction is not only horizontal but also vertical, and every time such reshaping or cutting direction changes, Dismantling and assembling the protective fence was very troublesome.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide a safety device for a wire saw which can control the flying range of the cut wire saw with a simple structure. Especially.

[0008]

In order to achieve the above object, the present invention provides an endless winding between an object to be cut and a drive pulley, which is circulated and run under a predetermined tension. In a wire saw safety device for cutting an object, a buffer block member, which is installed at least on the upper side of the wire saw in a circulating path, around which the cut wire saw is wound, and an arm supporting the buffer block member at one end side. And a supporting member that swingably supports the other end of the arm, and an elastic member is interposed between the arm and the supporting member.

The support member may be composed of a connecting portion having the elastic member and a torque limiter that releases the support of the arm when a rotational force of a set torque value or more is applied. In addition, the torque limiter detects that the support of the arm has been opened, and
A sensor with a pin protruding to the
Of the drive mechanism via a proximity switch that is activated by the protrusion of
Can be stopped .

[0010]

According to the wire saw safety device having the above structure, when the wire saw is cut, the wire saw is wound around the cushioning member.
The buffer block material prevents the wire saw from further flying. At this time, the arm supporting the cushioning block material at one end side is swingably supported by the supporting member with the elastic member interposed, so that when the cut wire saw is wrapped around the cushioning block material, the impact is elastic. It is further relaxed by the member.

According to the second aspect of the present invention, the torque limiter is provided to open the support of the arm when a rotational force equal to or greater than the set torque value is applied. Therefore, an excessive force is applied to the buffer block material. When added, the safety device can be prevented from being destroyed. Further, according to the configuration of claim 3, the operation of the wire saw driving device can be stopped by the sensor.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of a wire saw safety device according to the present invention. The safety device 10 shown in the figure is installed at least on the tension side upper part in a circulation traveling path of a wire saw to be described later, and a buffer block material 12 around which the cut wire saw is wound.
And an arm 14 for supporting the block member 12 on the upper end side.
And a support member 16 that swingably supports the other end of the arm 14.

The cushioning block material 12 in this embodiment is
A rod, which is made of rubber or soft synthetic resin material formed in a roller shape, and which extends through the center of the roller, is connected to one end of the arm 14. The support member 16 is, in this embodiment,
It is composed of a connecting portion 18 and a torque limiter 20. As shown in detail in FIG. 3, the connecting portion 18 is a hollow rectangular inner cylindrical portion 18a in which the lower end portion of the arm 14 is fixedly mounted.
And the hollow rectangular outer cylindrical portion 18b arranged by being displaced in the circumferential direction at an angle of 45 ° with respect to the rectangular inner cylindrical portion 18a.
And four cylindrical rubber rods 18c interposed between the cylindrical portions 18a and 18b.

The connecting portion 18 is capable of rotating the rectangular inner cylindrical portion 18a up to the elastic limit of the rubber rod 18c.
The arm 14 is rotatably supported within this range, and when the cut wire saw absorbs an impact when wound around the cushioning block material 12, and when the impact exceeds the elastic limit of the rubber rod 18c, the arm 14 becomes a corner. A rigid connection is established with the outer mold cylinder portion 18b.

As shown in detail in FIGS. 4 and 5, the torque limiter 20 has a hollow cylindrical outer cylinder portion 20a in which the rectangular outer cylinder portion 18b of the connecting portion 18 is fixedly mounted via a coupling 22. It has a fixed shaft portion 20b provided at the center of the outer cylinder portion 20a and a pair of torque springs 20c provided between the outer cylinder portion 20a and the fixed shaft portion 20b.

An arcuate slide piece 20d is connected to one end of each torque spring 20c, and the fixed shaft portion 2 is connected to the other end of the torque spring 20c.
A spring receiver 20e fixed to the 0b side is installed. Between the pair of slide pieces 20d, a drive key 20g that can be fitted into a groove 20f provided in the outer tubular portion 20a.
And the drive key 20g is rotatably supported by a pin 20h.

The torque limiter 2 constructed in this way
At 0, when a torque smaller than the set torque value (elastic force of the spring) of the torque spring 20c acts on the outer cylinder portion 20a, as shown in FIG. 20h, fixed shaft part 20
Although the outer cylinder portion 20a is supported by b, when a torque larger than the set torque value of the torque spring 20c is applied to the outer cylinder portion 20a, the drive key 20g resists the urging force of the spring 20c and slides the slide piece 20d. As it is pushed out, it is disengaged from the groove portion 20h, and the support of the outer cylindrical portion 20a is released.

A sensor 20i is provided at another cross section of the torque limiter 20 to detect the support of the outer cylinder 20b when the support is released. As shown in detail in FIG. 5, the sensor 20i is urged toward the center by a spring 20j and is inserted into a through hole 20k formed in the outer cylindrical portion 20a, and a pin 20l and a fixed shaft portion 20b. Notch 20 provided in the large-diameter portion 20m to be connected
n.

In this sensor 20i, the pin 20l is in contact with the notch 20n by the urging force of the spring 20j when the outer cylinder 20a is supported by the fixed shaft 20b, but the outer cylinder 20a is fixed. Out of the support of the shaft portion 20b,
When rotated relatively, the pin 20l is pushed by the peripheral surface of the large-diameter portion 20m against the urging force of the spring 20j, and the outer cylindrical portion 20a.
Project outwards. If the proximity switch 24 receives the protrusion of the pin 201, for example, the operation of the proximity switch 24 can stop the rotation of the drive pulley described later.

The member 26 shown in FIGS. 1 and 2 is a mounting plate to which the fixed shaft portion 20b is fixedly mounted, and the member 28 is a torque limiter 20 as will be described later.
When the support of the arm 14 by the
Is a rotation prevention stopper. The cutting prevention device 10 configured as described above is used in a state as shown in FIG.

In the figure, a through hole B is bored in the wall-shaped concrete structure A, and a wire saw C is placed in the through hole B.
The safety device 10 of the present invention is used to vertically cut the structure A by inserting the safety device 10. The wire saw C is endlessly wound between the drive pulley E of the drive device D installed on the front surface of the structure A to be cut and the structure A, and the drive pulley E is rotationally driven by a motor or an engine. By doing so, it causes circular traveling.

At this time, the guide sheave F is installed at an appropriate position of the structure A, and the safety device 10 of the present invention is installed on the tension side of the wire saw C in the middle of the circulation path. When the safety device 10 is installed, as shown by phantom lines in FIGS. 1 and 2, the wire saw C is installed below the cushioning block material 12 and located substantially at the center in the axial direction. Then, for example, the structure A with tension applied to the wire saw C by retracting the drive device D rearward.
Is cut.

At this time, when the wire saw C is cut, for example, when the wire saw C is hung on the reinforcing bar and the cutting resistance becomes extremely large, the cut wire saw C flies as shown by phantom lines in FIG. And buffer block material 12
Wrapped around. As a result, first, the shock is absorbed by the buffer block material 12, and the rearward flying of the wire saw C is prevented by the buffer block material 12. in this case,
The arm 14 that supports the buffer block material 12 at one end side is
Connecting portion 18 with rubber rod 18c (elastic member) interposed
Since the cut wire saw C is wound around the buffer block material 12, the impact is further mitigated by the rubber rod 18c.

On the other hand, the rubber rod 1 is attached to the buffer block material 12.
When an excessive force exceeding the elastic limit of 8c acts, the connecting portion 18
Is in a rigidly coupled state, and if this acting force is equal to or greater than the set torque value, the torque limiter 20 that releases the support of the arm 14 is provided, so if an excessive force is applied to the buffer block member 12, It is possible to prevent destruction of the safety device. In the above embodiment, the safety device of the present invention is provided with the torque limiter 20 for preventing its destruction, but the torque limiter 20 is not always necessary. Furthermore, the safety device of the present invention can be installed on the loose side of the wire saw C, for example.

[0025]

[Effects of the Invention] As described above in detail in the embodiments,
In the wire saw safety device according to the present invention, when the wire saw is cut, the cut wire saw is wound around the cushioning block material and its flying range is restricted.
The safety range during construction can be narrowed and
It is extremely easy to install and does not have the trouble of assembling and disassembling it like a fence that surrounds the wire saw.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a wire saw safety device according to the present invention.

FIG. 2 is a front view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a cross-sectional view taken along line BB of FIG.

5 is a cross-sectional explanatory view taken along line CC of FIG.

FIG. 6 is an explanatory diagram of a usage example of the safety device in FIG.

[Explanation of symbols]

 10 Safety Device 12 Buffer Block Material 14 Arm 16 Supporting Member 18 Connection Part 20 Torque Limiter

Claims (3)

[Scope of utility model registration request] 1. A wire saw safety device for cutting an object to be cut by endlessly winding it between the object to be cut and a drive pulley and causing the object to cut by circulating running under a predetermined tension state. A buffer block material installed at least on the upper side of the tension side in the path, around which the cut wire saw is wound, an arm that supports the buffer block material at one end side, and a support that swingably supports the other end side of the arm. A safety device for a wire saw, comprising: a member; and an elastic member interposed between the arm and the support member. 2. The support member includes a connecting portion having the elastic member, and a torque limiter that releases support of the arm when a rotational force equal to or greater than a set torque value is applied. The safety device for a wire saw according to claim 1. 3. The torque limiter has a pin that detects that the support of the arm is opened and projects to the outside.
A sensor with a
The drive pulley is stopped via a moving proximity switch.
The safety device for a wire saw according to claim 2, wherein the safety device is a wire saw.