Cutting unit and cutting device

Abstract

To provide a cutting unit capable of speeding up the response of a cutting device used and suppressing costs, and a cutting device using the same.SOLUTION: A cutting unit 20 comprises a base part 21, a drive pulley 22 that drives a wire saw 31, a first guide pulley 24 supported by a first support 23, and a second guide pulley 26 supported by a second support 25. The wire saw 31 is wound so as to pass between the first guide pulley 24 and the second guide pulley 26, and an urging member 27 that applies an approach force is provided between the first support 23 and the second support 25. With this configuration, a device for adjusting a cutting position of the wire saw 31 is not needed to provide, the weight of the cutting unit 20 can be reduced, and the response of the operation of a heavy machinery using this cutting unit 20 can be made faster.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cutting unit and a cutting device, more particularly to a cutting unit having a wire saw and a cutting device equipped with said cutting unit. [Background technology]

[0002] In the demolition of concrete members such as RC (reinforced concrete) or SRC (steel-reinforced concrete) structures, the crushing method and the pull-down method are often used. To explain in detail, workers break the concrete at the bottom of columnar concrete members using a jackhammer such as a breaker, and cut the exposed rebar and steel frame by gas fusion (crushing method). During this work, workers are careful not to melt all of the rebar or steel frame, and then use heavy machinery to grasp the upper end of the concrete member and pull it down (pulling method). When a concrete member is located at a height of several meters to several tens of meters, the crushing method requires preventing concrete fragments from scattering on the side opposite the side where it is pulled down, and there is a problem in that the workload of the curing required to prevent this is large.

[0003] In response to this, a pull-cutting method using a wire saw has been disclosed in the stage preceding the pull-down method, as shown in Patent Document 1. By using the pull-cutting method, concrete fragments can be prevented from scattering, and the workload for curing can be reduced. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-76012 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the attachment for the wire saw disclosed in Patent Document 1 is very heavy and has a complex structure. Since this attachment is attached to the tip of the arm of the heavy machinery, if the attachment becomes heavy, there is a problem that the response when operating the heavy machinery is slow. To be more specific, the attachment part of Patent Document 1 is equipped with a mechanism for driving the wire saw and a position adjustment mechanism for changing the cutting position into the concrete member. When performing the pull cutting process with the wire saw, the cutting position of the wire saw is changed by the position adjustment mechanism without operating the guide frame that serves as the base.

[0006] Since the attachment includes a position adjustment mechanism, the attachment becomes heavy. Since the attachment is attached to the end of the arm of the heavy machinery, the response of the attachment to the operation is slow. In addition, since the attachment includes a position adjustment mechanism, the structure of the attachment becomes complicated, which increases the manufacturing cost, the method of use becomes complicated, which requires skill to operate, and the frequency of breakdowns increases.

[0007] In view of the above circumstances, an object of the present invention is to provide a cutting unit that can speed up the response of a cutting device used and reduce costs, and a cutting device using the same. [Means for solving the problem]

[0008] The cutting unit of the first invention is a cutting unit used in a cutting device having a swinging arm, and is composed of a base portion for connecting to the swinging arm, a drive pulley provided on the base portion for driving an endless loop-shaped wire saw, a first guide pulley supported by a first support extending from the base portion for guiding the movement of the wire saw from the drive pulley to the workpiece, and a second guide pulley supported by a second support extending from the base portion for guiding the movement of the wire saw from the workpiece to the drive pulley, wherein the wire saw is looped so as to pass between the first guide pulley and the second guide pulley, and a biasing member is provided between the first support and the second support for applying a proximity force in a direction bringing the first support and the second support closer to each other. The cutting unit of a second aspect of the present invention is the cutting unit of the first aspect of the present invention, characterized in that the biasing member is a coil spring. The cutting unit of the third invention is characterized in that, in the first invention, it is provided with a detection device that detects the proximity force applied to the urging member, and a detection device that notifies a user of the cutting device of the proximity force based on a detection signal from the detection device. The cutting device of the fourth invention is characterized by comprising a lower frame having a traveling mechanism, an upper frame provided above the lower frame and rotatable in a horizontal plane relative to the lower frame, a swing arm provided on the upper frame, and a cutting unit of the first invention provided at the tip of the swing arm. Effect of the Invention

[0009] According to the first invention, the cutting unit includes a first guide pulley supported by a first support and a second guide pulley supported by a second support, and a predetermined biasing member is provided between the first support and the second support, so that there is no need to provide a device for adjusting the cutting position of the wire saw. This allows the weight of the cutting unit to be reduced, and the response of the operation of the heavy machinery using this cutting unit can be made faster. In addition, the cutting unit can be simplified in configuration, so that the cost of manufacturing the cutting unit can be reduced. Furthermore, the simple configuration does not require special skills for operation, and even an inexperienced user can easily operate it. In addition, the simple configuration reduces the frequency of failure of the cutting unit. This reduces the occurrence of construction delays. According to the second aspect of the present invention, the biasing member is a coil spring, and since coil springs have high durability, the durability of the cutting unit can be increased. According to the third invention, a detection device for detecting the proximity force and a detection device for making the user aware of this proximity force are provided, thereby enabling the user to grasp the load acting on the wire saw more reliably than by visual inspection. According to the fourth aspect of the present invention, the cutting unit is provided on heavy machinery having a predetermined configuration, thereby enabling the heavy machinery to respond quickly to the operation of the heavy machinery. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a cutting unit according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the cutting unit of FIG. [Diagram 3] 2 is an explanatory diagram of a method of using a cutting device including the cutting unit of FIG. 1. [Figure 4] 2 is an explanatory diagram of a first usage position of the cutting unit in FIG. 1. [Diagram 5] 1. FIG. 4 is an explanatory diagram of a second usage position of the cutting unit in FIG. [Figure 6] FIG. 11 is a plan view of a cutting unit according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Next, an embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below is an example of a cutting unit and a cutting device for embodying the technical concept of the present invention, and the present invention does not limit the cutting unit and the cutting device to those described below. Note that the size or positional relationship of the members shown in each drawing may be exaggerated for clarity of explanation.

[0012] (Cutting unit 20 of the first embodiment) Fig. 1 shows a perspective view of a cutting unit 20 according to a first embodiment of the present invention, and Fig. 2 shows a plan view of the cutting unit 20. The cutting unit 20 is used in heavy machinery such as an excavator having a swing arm 13. Fig. 1 shows the cutting unit 20 in a state separated from the second swing arm 13b. The hatched portion in Fig. 2 indicates a portion of the workpiece C before cutting.

[0013] The cutting unit 20 has a function of driving an endless loop-shaped wire saw 31 in the direction of the arrow in Fig. 2 to cut the workpiece C. The cutting unit 20 has a base portion 21, which is provided with a cutting unit side connection portion 21a for connection to the second swing arm 13b. In order to reduce weight, the base portion 21 is formed by screwing together a number of steel pipes. It is preferable that the cross section perpendicular to the axial direction of these steel pipes is rectangular.

[0014] A hydraulic motor 30 is provided above the base portion 21. The hydraulic oil for the hydraulic motor 30 is preferably supplied from the heavy equipment side. A drive pulley 22 for driving the wire saw 31 is provided below the base portion 21. The outer periphery of the drive pulley 22 is provided with hard rubber to drive the wire saw 31 without slipping. In order to reduce the weight of the drive pulley 22, the outer periphery and a hub located in the center are connected by multiple rims.

[0015] The cutting unit 20 includes a first guide pulley 24 for guiding the operation of the wire saw 31 from the drive pulley 22 to the workpiece C. The first guide pulley 24 is rotatably supported by the first support 23. Like the drive pulley 22, the first guide pulley 24 is also provided with hard rubber on its outer periphery. The first support 23 is provided on the base 21 so as to extend from the base 21 in the direction in which the workpiece C is present, and is fixed to the base 21 so as to be swingable within a plane parallel to the paper surface of FIG. 2. The first support 23 is preferably made of a steel pipe having a rectangular cross section perpendicular to the axial direction. The plane including the outer periphery of the first guide pulley 24 with which the wire saw 31 comes into contact is preferably consistent with the plane including the outer periphery of the drive pulley 22 with which the wire saw 31 comes into contact.

[0016] The cutting unit 20 includes a second guide pulley 26 for guiding the movement of the wire saw 31 from the workpiece C to the drive pulley 22, similar to the first guide pulley 24. The second guide pulley 26 is rotatably supported by the second support 25. Similar to the drive pulley 22, the second guide pulley 26 is provided with hard rubber on its outer periphery. The second support 25 is provided on the base 21 so as to extend from the base 21 in the direction in which the workpiece C exists, and is fixed to the base 21 so as to be swingable within a plane parallel to the paper surface of FIG. 2. The second support 25 is preferably made of a steel pipe having a rectangular cross section perpendicular to the axial direction. The plane including the outer periphery of the second guide pulley 26 with which the wire saw 31 comes into contact is preferably consistent with the plane including the outer periphery of the drive pulley 22 with which the wire saw 31 comes into contact.

[0017] The wire saw 31 is preferably wound so as to pass between the first guide pulley 24 and the second guide pulley 26. In detail, the drive pulley 22 rotates clockwise when viewed from the perspective of the paper of FIG. 2. Therefore, the wire saw 31 exits from the right side of the drive pulley 22 toward the workpiece C when viewed from the perspective of the paper of FIG. 2. The wire saw 31 exiting from the drive pulley 22 comes into contact with the first guide pulley 24 on the left side of the first guide pulley 24, i.e., on the side where the second guide pulley 26 is present, when viewed from the perspective of the paper of FIG. 2, and exits toward the workpiece C. The wire saw 31 that has finished processing the workpiece C comes into contact with the second guide pulley 26 on the right side of the second guide pulley 26, i.e., on the first guide pulley 24 side, when viewed from the perspective of the paper of FIG. 2, and exits toward the drive pulley 22. 2, a force acts on the first guide pulley 24 toward the right side from the wire saw 31, and a force acts on the second guide pulley 26 toward the left side from the wire saw 31. In other words, a force acts between the first guide pulley 24 and the second guide pulley 26 due to machining by the wire saw 31 in a direction in which the pulleys move apart.

[0018] The cutting unit 20 is provided with a biasing member 27 between the first support 23 and the second support 25, which applies an approaching force in a direction in which the first support 23 and the second support 25 approach each other. In this embodiment, the biasing member 27 is a coil spring. However, the biasing member 27 is not limited to this. For example, the biasing member 27 may be made of a rubber material.

[0019] The cutting unit 20 is configured to include a first guide pulley 24 supported by a first support 23 and a second guide pulley 26 supported by a second support 25, and a predetermined biasing member 27 is provided between the first support 23 and the second support 25, so that there is no need to provide a device for adjusting the cutting position of the wire saw 31, the weight of the cutting unit 20 can be reduced, and the response of the operation of the heavy equipment using this cutting unit 20 can be made faster. In addition, because the configuration of the cutting unit 20 can be simplified, the cost of manufacturing the cutting unit 20 can be reduced.

[0020] Since the biasing member 27 is a coil spring, the durability of the cutting unit 20 can be increased since the coil spring has high durability.

[0021] Incidentally, the above description concerns the main members of the cutting unit 20. For example, a safety cover for the drive pulley 22 may be provided as an auxiliary member.

[0022] (Cutting device 10) A cutting device 10 equipped with a cutting unit 20 will be described with reference to Figures 1 and 3. Figure 3 is an explanatory diagram of a method of using the cutting device 10 equipped with the cutting unit 20. The cutting device 10 is configured such that the cutting unit 20 is provided as an attachment located at the tip of a so-called construction machine such as a hydraulic excavator or a demolition machine. The configuration will be specifically described below.

[0023] The cutting device 10 includes a lower frame 11 having a traveling mechanism. In this embodiment, the traveling mechanism is a crawler 11a, but the form of the traveling mechanism is not limited to this. For example, the traveling mechanism may have a configuration having a plurality of tires.

[0024] The cutting device 10 includes an upper frame 12 provided above a lower frame 11. The upper frame 12 is configured to be rotatable in a horizontal plane relative to the lower frame 11. The upper frame 12 also includes a driver's section 12a into which a user of the cutting device 10 gets on.

[0025] The cutting device 10 is provided with a swing arm 13 on an upper frame 12. In this embodiment, the swing arm 13 includes a first swing arm 13a shaped like the character "L" in hiragana, and a second swing arm 13b provided on the free end side of the first swing arm 13a. These swing arms 13 are driven by a plurality of hydraulic cylinders 14.

[0026] The cutting device 10 is provided with a cutting unit 20 at the tip of the second swing arm 13b, i.e., on the free end side. A swing arm side connecting part 13c is provided at the tip of the second swing arm 13b. The cutting unit 20 is provided in the cutting device 10 by connecting the swing arm side connecting part 13c to the cutting unit side connecting part 21a.

[0027] By providing the cutting unit 20 to heavy machinery having a predetermined configuration, the response of the operation of the heavy machinery can be made faster.

[0028] (Usage position of cutting unit 20) 4 shows the cutting unit 20 in a first use position, and FIG. 5 shows the cutting unit 20 in a second use position.

[0029] In the first use position, the swing arm side connection part 13c and the cutting unit side connection part 21a are aligned so that the axis of the drive pulley 22 is vertical. In this case, since the wire saw 31 operates in a horizontal plane, the workpiece C is a vertically long columnar concrete or the like with a vertical axis.

[0030] In the second use position, the swing arm side connection part 13c and the cutting unit side connection part 21a are aligned so that the axis of the drive pulley 22 is horizontal. In this case, since the wire saw 31 operates within a vertical plane, the workpiece C is a beam-like concrete or the like that is long in the horizontal direction and has a horizontal axis.

[0031] (How to use the cutting device 10) Before performing the pull-cutting method using the wire saw 31, the user of the cutting device 10 connects the cutting unit side connector 21a and the swing arm side connector 13c in accordance with the shape of the workpiece C, and installs the cutting unit 20 on the cutting device 10. At this time, the hydraulic piping 32 on the swing arm 13 is connected to the hydraulic motor 30 so that the rotation of the drive pulley 22 can be operated from the driver's seat of the cutting device 10.

[0032] Next, the user of the cutting device 10 moves the cutting device 10 to a position where the pull-cutting method will be performed, i.e., to the vicinity of the workpiece C. At this time, since the position of the entire cutting unit 20 is changed by the swing arm 13, etc. when performing the pull-cutting method, the user moves the cutting device 10 to a position taking into consideration this operation. Then, the wire saw 31 is wound around the workpiece C and the drive pulley 22, and the wire saw 31 is inserted into the grooves on the outer circumferences of the first guide pulley 24 and the second guide pulley 26. Then, the biasing member 27 is installed between the first support 23 and the second support 25.

[0033] The user of the cutting device 10 operates the swing arm 13 to apply a predetermined pulling force to the wire saw 31. At this time, the user of the cutting device 10 can check how much pulling force is being applied to the wire saw 31 by visually checking the length of the biasing member 27. In this state, the user of the cutting device 10 activates the hydraulic motor 30 to drive the wire saw 31. This starts cutting the workpiece C.

[0034] As the cutting of the workpiece C by the wire saw 31 progresses, the pulling force applied to the wire saw 31 decreases. In this case, the biasing member 27 narrows the gap between the first guide pulley 24 and the second guide pulley 26, so the user of the cutting device 10 operates the swing arm 13, etc., to increase the pulling force applied to the wire saw 31 so that the length of the biasing member 27 becomes a predetermined length.

[0035] When the pull-cutting method using the wire saw 31 is performed up to a predetermined portion, the user of the cutting device 10 ends the pull-cutting method. Then, the cutting device 10 is moved away from the place where the pull-cutting method was performed. In this state, the workpiece C is pulled down by a pull-down method using a dismantling machine or the like.

[0036] (Cutting unit 20 of second embodiment) FIG. 6 shows a plan view of the cutting unit 20 according to the second embodiment of the present invention. The difference from the first embodiment is that a third guide pulley 28 and a fourth guide pulley 29 are provided near the workpiece C so as to leave a part of the workpiece C shown by hatching uncut. Only this difference will be described here. The wire saw 31 processes the workpiece C from the first guide pulley 24 through the third guide pulley 28, and then moves to the second guide pulley 26 via the fourth guide pulley 29. The presence of the third guide pulley 28 and the fourth guide pulley 29 makes it possible to control the dimensions of the uncut part of the workpiece C with high precision. In FIG. 6, the third guide pulley 28 and the fourth guide pulley 29 are supported by the workpiece C, but this configuration is not shown in FIG. 6 to make the description of the configuration easier to understand. It is also possible to configure the third guide pulley 28 and the fourth guide pulley 29 so that they are not supported by the workpiece C. For example, the workpiece C may be supported on a base provided independently of the workpiece C.

[0037] (others) In this embodiment, the user of the cutting device 10 visually checks the urging member 27 and judges the magnitude of the pulling force applied to the wire saw 31 from the length of the urging member 27, but the present invention is not limited to this embodiment. For example, it is also possible to provide a detection device at the end of the urging member 27 that detects the proximity force applied to the urging member 27, and to provide a notification device that notifies the user of the cutting device 10 of the proximity force based on a detection signal from the detection device. The notification device may be, for example, a liquid crystal monitor or a speaker. [Explanation of symbols]

[0038] 10 Cutting device 11 Lower frame 12 Upper frame 13 Swing Arm 20 Cutting unit 21 Base 22 Drive pulley 23 First Support 24 First guide pulley 25 2nd Support 26 Second guide pulley 27 Pressing member 31 Wire saw

Claims

1. A cutting unit for use in a cutting device having a swing arm, comprising: a base portion for coupling to the swing arm; A drive pulley is provided on the base portion and drives an endless loop-shaped wire saw; a first guide pulley that guides the movement of the wire saw from the drive pulley to a workpiece and is supported by a first support extending from the base portion; a second guide pulley that guides the movement of the wire saw from the workpiece to the drive pulley and is supported by a second support extending from the base portion; The wire saw is wound so as to pass between the first guide pulley and the second guide pulley, a biasing member is provided between the first support and the second support, the biasing member applying an approaching force in a direction in which the first support and the second support approach each other; A cutting unit characterized by:

2. The biasing member is a coil spring.

2. A cutting unit as claimed in claim 1.

3. a detection device for detecting the proximity force applied to the biasing member; and a detection device that notifies a user of the cutting device of the approach force based on a detection signal from the detection device.

2. A cutting unit as claimed in claim 1.

4. A lower frame having a traveling mechanism; an upper frame provided above the lower frame and rotatable relative to the lower frame in a horizontal plane; A swing arm provided on the upper frame; The cutting unit according to claim 1 is provided at a tip of the swing arm. A cutting device characterized in that

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