JPH06218724A - Wire saw driver - Google Patents

Abstract

PURPOSE:To make immediately absorb a rapid load on a wire absorbed and to easily measure a load on the wire by a simple device. CONSTITUTION:A wire saw driver comprises a wire drive pulley 4 driven by a rotation drive mechanism; a guide pulley 11 and a tension-side adjusting pulley 7 which are provided on the tension side of a wire wound on the wire drive pulley; a slack-side adjusting pulley 14 provided on the slack side of the wire; and a tensile force holding means for absorbing the sag of the slack-side wire. The guide pulley 11 and the tension-side adjusting pulley 7 are juxtaposed approximately vertically to a wire running direction to the wire drive pulley 4. A resilient force mechanism 17 is provided for moving the tension-side adjusting pulley 7 in the wire running direction in accordance with the fluctuation of the tensile force of the wire on the tension side. Furthermore, a tensile force measuring means 19 is provided on a support member of the tension-side adjusting pulley or the guide pulley.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire saw driving device for cutting stone materials, reinforced concrete and the like with a wire saw.

[0002]

2. Description of the Related Art In a quarry, to cut stone materials,
Conventionally, a wire saw has been used. On the other hand, this cutting wire saw provided with diamond beads at a required pitch can cut hard materials, so it can also cut various reinforced concrete structures such as buildings and bridges. Attention has been paid to its cutting speed, safety, pollution-free properties such as noise and vibration.

In such a wire saw, an elastic material such as rubber or resin material is interposed as a spacer with respect to the wire, and a large number of diamond beads are provided at a required pitch. The wire saw is driven from the outside. It is hung between the drive pulley and the material to be cut and driven by the drive pulley to run the wire saw and perform the cutting work. Also,
The wire saw drive is equipped with a tension side adjustment pulley and a slack side adjustment pulley that guide the tension side wire saw and the slack side wire saw, respectively, so that the wire saw that is hung on the drive pulley can always be wound stably. Things are known.

On the other hand, when cutting reinforced concrete with a wire saw, the cutting by the running wire is transferred from the concrete layer to the reinforcing bar, or the running wire is caught on the sharpened cut end of the reinforcing bar. When the wire bites into the wire, the momentarily increased tension causes the spacer made of elastic material interposed between the diamond beads to be crushed and the wire itself may be overloaded, causing the wire to break. is there. In particular, when a strong force is applied to the wire to increase the cutting speed and the tension of the wire is increased, the tension instantaneously becomes extremely large, and further, when the cutting operation is performed in water, a larger tension is applied.

Even when a cutting operation is performed with such a large tension, the limit of the load is set within the limit that the spacer material is crushed. In addition, when the wire saw is broken due to an excessive load, it is often caused by a dropout at a joint portion that connects both ends of the wire.
That is, since the joint part of the wire has a strength of about a quarter of that of the wire, the momentary impact load during cutting of the reinforcing bar part crushes the spacer material and causes an excessive load to the joint part. Will occur and the wire will break.

If the wire is instantly broken, not only will the wire bounce backward and cause damage to various equipment and workers, but also the diamond beads of the wire will scatter around with the spacer, causing a wide range of damage. Further, since the cutting work is interrupted for a long time due to the repair work of the broken wire and the replacement work of the wire, the work efficiency is lowered. On the other hand, if the strength of the wires, joints, spacers, etc. is increased to prevent such wire breakage during use, when a shock load is applied to the wire, a sudden excessive load is applied to the wire saw drive device, The equipment will be damaged, and even more damage will be caused.

As a countermeasure against such an impact load, the applicant previously provided an elastic mechanism on the tension side adjustment pulley provided between the drive pulley and the guide pulley at the wire tension side portion of the drive pulley, and by this elastic mechanism, ,
A wire saw drive device is proposed in which the tension side adjustment pulley is biased in the direction in which the wire is wound around the wire drive pulley and the guide pulley (Japanese Patent Publication No. 4-91).
No. 38). That is, not only the impact load applied to the wire is instantaneously absorbed by this elastic mechanism, but also the wire is always stably applied to the tension side adjustment pulley by the guide pulley to stabilize the impact load absorption function. It is a thing.

[0008]

In the above device, the tension side adjusting pulley and the guide pulley, which are biased against the wire by the elastic mechanism, can always stably absorb the impact load. However, in the previously proposed device, the tension-side adjustment pulley and the guide pulley are arranged substantially parallel to the running direction of the wire. The wrapping angle around the pulley must be small. Therefore, the tension applied to the wire has a small component force that moves the tension side adjustment pulley against the pressing force of the elastic mechanism, and therefore the force that absorbs the tension applied to the wire by the elastic mechanism is small.

On the other hand, in cutting work with a wire saw, in order to prevent breakage of the wire or damage to the wire driving device in advance due to overload on the wire, the load applied to the wire is constantly measured. It is desirable to stop the drive immediately or at least generate an alarm or the like. It is extremely difficult to measure the load of such a wire saw in a conventional device, and therefore, it is desired to develop a means for easily measuring the load of the wire with a simple device.

Therefore, the present invention provides a wire saw driving device capable of immediately absorbing a sudden load applied to the wire and capable of easily measuring the load applied to the wire with a simple device. To aim.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks of the prior art, the present invention provides a wire drive pulley driven by a rotary drive mechanism, and a guide pulley provided on the tension side of the wire wound around the wire drive pulley. In a wire saw driving device equipped with a tension side adjustment pulley, a slack side adjustment pulley provided on the slack side of the wire, and a tension holding means for absorbing slack of the slack side wire, a guide pulley and a tension side adjustment pulley are provided as a wire drive pulley. Is installed in a direction substantially perpendicular to the wire running direction, and an elastic mechanism is provided to move the tension side adjustment pulley in the wire running direction according to the tension side tension fluctuation of the wire. The support member is provided with a tension measuring means for the tension side wire, and Can immediately absorb urgent load, also it is obtained so as to be easily measured load on the wires with a simple device.

[0012]

Since the present invention is configured as described above, the wire wound around the wire driving pulley is guided by the guide pulley and the tension side adjusting pulley on its tension side and the slack side adjusting pulley on its slack side. While the tension holding means absorbs the looseness of the loose wire, the wire is driven by the wire drive pulley driven by the rotary drive mechanism to cut the workpiece. The slack of the loose side wire due to the progress of cutting of the work piece by the wire saw is always absorbed by the tension holding means, and the sudden load fluctuation applied to the wire when cutting the work piece is By the elastic mechanism provided,
The tension side adjustment pulley is absorbed by moving in the traveling direction of the wire to the wire drive pulley. At this time, the load fluctuation of the tension side wire is constantly measured by the tension measuring means provided on the support member of the tension side adjustment pulley or the guide pulley, and the overload on the wire is detected.

[0013]

Embodiments of the present invention will be described with reference to the drawings. The wire saw drive device main body 1 includes wheels 3 traveling on the rails 2 and a wire drive pulley 4, and these can be driven by a drive device inside the main body. A pulley supporting frame 5 is projectingly provided in front of the main body 1, and a first slide block 8 rotatably supporting a tension side adjusting pulley 7 is slidably fitted to a first arm 6 thereof, A second slide block 12 that rotatably supports a guide pulley 11 is slidably fitted on the arm 10, and a slack adjustment pulley 14 is rotatably supported on a third arm 13.

Each end of a spring 17 is fixed to a spring fixing portion 15 provided on the first slide block 8 supporting the tension side adjusting pulley 7 and a spring fixing portion 16 provided on the entire surface of the main body 1. The second slide block 12 that supports the guide pulley 11 and the pulley support frame 5
Similarly, as shown in FIG. 3, the spring 18 is fixed between them, and the cover cylinder 20 is provided on the pulley support frame 5 so as to cover the spring 18 and the second slide block 12. The cover cylinder 20 has a slit 21 in which the second slide block 1
A pointer 22 projecting from 2 is slidably fitted. In addition, the scale 2 is provided on the surface around the slit 21 of the cover cylinder 20.
3 is provided to constitute the tension measuring means 19.

A body cover 24 is projected above the entire surface of the body 1 to cover the tension adjusting pulley 7 from above. If necessary, a metal net is stretched over the entire range where the main body 1 travels along the rails 2, and if the wire saw breaks during the cutting work with the wire saw, the wire and diamonds provided on the wire are rearward. It may be prevented from scattering. At that time, the metallic nets preferably have a structure capable of being divided into two parts from the center in terms of handling.

When using the above-mentioned apparatus, as shown in FIG. 1, a wire 25 is laid between the workpiece 24 such as a reinforced concrete structure and the pulleys 4, 7, 11, 14 of the main body 1 and the slack side wire 26. Set so that there is no slack. Next, the wire drive pulley 4 is driven, and the wire wound around the wire drive pulley 4 is caused to travel by frictional force to cut the workpiece 24. As the cutting work progresses, the slack side wire 26 will be loosened. In response to the looseness, the wheel 3 is driven to retract the main body 1, absorb the looseness, and keep the wire tension constant. To do.

When the object to be cut is cut by the wire 25, the tension-side adjusting pulley 7 resists the returning force of the spring 17 in accordance with the load applied to the tension-side wire 27, that is, the tension. The first pulley 6 moves along the first arm 6 and the guide pulley 11 moves leftward in the figure along the second arm 10 against the return force of the spring 18. Therefore, when the wire hits the inner reinforcing bar when cutting the reinforced concrete structure, a large load is momentarily applied and an impact load is applied. In that case, the tension side adjustment pulley 7 and the guide pulley 11 are Since the springs 17 and 18 are pulled, even if the wire drive pulley 4 is driven at a constant speed, the preceding wire 25 does not momentarily generate excessive tension.

In addition, the tension side adjusting pulley 7 acts to absorb the excessive tension, that is, the excessive load.
The tension side adjustment pulley 7 and the guide pulley 11 are arranged in parallel with each other in a direction substantially perpendicular to the traveling direction of the tension side wire 27, while the tension side adjustment pulley 7 and the guide pulley 11 move in the same direction. For example, if the wire moves 1 cm, the wire can move 2 cm, and the load absorbing ability of the wire is extremely large. Further, since the movement of the tension side adjusting pulley 7 at the time of absorbing the overload is in the pulling direction of the spring 17, if it is within the elastic range, it becomes possible to move up to several times the free length of the spring, and the direction in which the spring is compressed. When moving to, the restriction within the range from the free length of the spring to the total compression length is removed, and the overload absorption capacity becomes extremely large.

On the other hand, the guide pulley 11 also slides on the second arm while pulling the spring 18 in accordance with the change in the tension of the tension wire 27. As a result, similarly to the spring 17, the spring 18 absorbs the tension fluctuation of the tension side wire, and by reading the position of the pointer 22 on the scale 23, the tension applied to the wire, that is, the load is measured. be able to.

By fixing a magnet on the pointer 22 and providing a reed switch at the position of the scale 23 showing a predetermined high load, it is possible to automatically detect that the wire has a high load higher than a predetermined value. it can. Various other means can be adopted for such automatic detection of the load, and the spring 18
When using air pressure or hydraulic type shock absorber instead of
Various load measuring means and overload detecting means can be adopted. In addition, when measuring the load, in addition to measuring by extending the spring, it is also possible to measure the strain due to the load of this spring or the guide pulley support member etc. and replace it with an electrical signal and display it in analog or digital. The load can be measured even if the guide pulley is fixed. Furthermore, when an overload is detected by the above-mentioned various means, it is possible to control various operations such as turning on a warning light, operating a buzzer, and stopping the wire driving device.

In the above embodiment, an example in which the tension measuring device for the tension side wire is provided for the guide pulley 11 has been shown. However, the tension measuring device for the tension side adjusting pulley 7 has a spring 17 as a tension measuring device similar to the above. A device may be provided, in which case the guide pulley 11 may be rotatably fixed to the support frame 5. At this time, in place of the spring 17 as an elastic mechanism, an air pressure or hydraulic type shock absorber can be used as in the case of the guide pulley 11, and by measuring the air pressure or the oil pressure of this shock absorber. It is also possible to measure the tension. Thus, when the tension measuring means is provided in the tension side adjusting pulley, it is possible to serve both as the elastic mechanism and the tension measuring means.

In the above embodiment, the tension adjusting pulley 7 is located above the guide pulley 11, but the position of each pulley is reversed and the guide pulley 11 is rotated.
May be arranged above and the tension side adjustment pulley 7 may be arranged below. A compression spring may be provided in front of the pulley 7 or the spring may be built in the arm 6.
At that time, regardless of the direction of the wire from the object to be cut, the wire is scheduled to be wound around the tension-side adjusting pulley located below, so that the tension fluctuation absorbing action of the tension-side wire is always stable. However, since the wire introduction direction can be set in a wide range, the cutting work becomes easy.

A slack side guide pulley 30 may be provided in front of the slack side adjustment pulley 14 as shown by a chain line in FIG.

[0024]

EFFECTS OF THE INVENTION Since the present invention is configured and operates as described above, it is possible to immediately and extensively absorb tension fluctuations due to fluctuations in the load applied to the wire during the cutting work with the wire, and to reduce the load passiveness of the wire. The wave phenomenon can be eliminated. In addition, since it is possible to absorb the impact load that is suddenly applied to the wire, it is possible to prevent the elastic spacers between the diamond beads provided on the wire from being crushed and damaged due to excessive load, and the wire is broken due to the wire joint coming off, etc. Alternatively, it is possible to reliably prevent the wire driving device from being damaged due to overload. Furthermore, the tension of the tension side wire by the tension measuring means,
That is, the load can be constantly measured, an overload on the wire can be detected, and based on the detection, it is possible to perform an operation as various equipment safety measures such as operation of a lamp and a buzzer or stop of a wire driving device. Become.

[Brief description of drawings]

FIG. 1 is a side view showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a side view showing a main part of the wire saw driving device.

FIG. 3 is a sectional view of the vicinity of the guide pulley of FIG.

[Explanation of symbols]

 1 wire saw drive device main body 2 rail 3 wheel 4 wire drive pulley 5 pulley support frame 6 first arm 7 tension side adjustment pulley 8 first slide block 10 second arm 11 guide pulley 12 second slide block 13 third arm 14 looseness Side adjustment pulley 15 Spring fixing part 16 Spring fixing part 17 Spring 18 Spring 19 Tension measuring means 25 Wire 26 Loose side wire 27 Tension side wire

Claims (2)

[Claims] 1. A wire drive pulley driven by a rotary drive mechanism, a guide pulley and a tension side adjustment pulley provided on a tension side of a wire wound around the wire drive pulley,
In a wire saw driving device provided with a slack adjustment pulley provided on the slack side of the wire and a tension holding means for absorbing slack of the slack wire, the guide pulley and the tension adjustment pulley are provided with a wire traveling direction to the wire drive pulley. A wire saw drive device is provided in which the elastic mechanism is arranged in a substantially vertical direction and moves the tension-side adjusting pulley in the wire traveling direction according to the tension-side tension fluctuation of the wire. 2. A wire drive pulley driven by a rotary drive mechanism, a guide pulley and a tension side adjustment pulley provided on a tension side of a wire wound around the wire drive pulley,
In a wire saw driving device provided with a slack adjustment pulley provided on the slack side of the wire and a tension holding means for absorbing slack of the slack wire, the guide pulley and the tension adjustment pulley are provided with a wire traveling direction to the wire drive pulley. Is installed in a substantially vertical direction with respect to the tension side adjustment pulley or the guide pulley, and an elastic mechanism is provided for moving the tension side adjustment pulley in the wire traveling direction according to the tension side tension fluctuation of the wire. A wire saw driving device, characterized in that the tension measuring means is provided.