Low noise type cutting device

Abstract

To provide a low noise type cutting device which suppresses driving noise when the cutting device cuts a surface part of a paved road surface.SOLUTION: A cutting device for cutting a surface part of a paved road surface by lowering a liftable cutting drum 15 disposed in a cutting drum chamber 13 until it abuts on the surface part of the paved road surface, and moving accompanied by rotation of the cutting drum 15, includes: a road surface cutting machine body 11 having the cutting drum chamber 13 liftably storing the cutting drum 15; and a noise suppression material 30 which is mounted so as to cover each of a side face and an upper face of the cutting drum chamber 13 and has sound absorption property and sound insulation property.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a low-noise cutting device, and more particularly to a low-noise cutting device for cutting surface portions of paved road surfaces. [Background technology]

[0002] The cutting and overlay method has been known as a method for repairing pavement surfaces made of cement concrete or asphalt mixtures. This method involves using a road cutting machine to remove surface areas of the pavement that have been damaged by repeated running of large vehicles on the pavement, and then repaving the surface with new materials (see, for example, Patent Document 1).

[0003] A self-propelled road milling machine known from Patent Document 1 and the like comprises a relatively long cutting drum that is rotatably mounted on the road milling machine body and has cutting bits on its outer periphery, a first belt conveyor adjacent to the front of the cutting drum (in the work or construction direction) that receives the cutting material cut by the cutting drum from the cutting drum and transports it outside the road milling machine body, a second belt conveyor that receives the cutting material from the first belt conveyor and transports it to a transport vehicle (truck) or the like, and a cutting device that serves as the power source for the road milling machine.

[0004] While the road milling machine is self-propelled by the driving force of the engine, the cutting drum is also rotated at high speed by the driving force of the engine, and bits attached to the outer periphery of the cutting drum are struck hard against the paved road surface by the rotation of the cutting drum to scrape off and cut portions of the surface of the paved road, and the cutting material is transported from the rotating cutting drum onto a belt conveyor and further from the belt conveyor directly to a transport vehicle or the like, and removed from the paved road surface to be repaired. This method is mainly used for large-scale repair work of paved roads, in particular because it is possible to cut a wide width of the paved road surface to be repaired at once with the cutting drum and remove the cutting material.

[0005] In the self-propelled road milling machine with the above-mentioned structure, cutting noises are generated when cutting the surface part of the pavement. Specifically, cutting noises such as the impact sound (impact sound) when the cutting drum bit hits the surface part of the pavement, the scratching sound generated when scraping off the surface part of the pavement, and the impact sound (impact sound) generated when the cutting material hits the wall surface inside the drum chamber are loud and problematic. Therefore, when working in an area adjacent to residential areas, it directly stimulates the senses of the residents, and there is concern about the impact on their daily lives. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-75489 A Summary of the Invention [Problem to be solved by the invention]

[0007] As mentioned above, the operation of road milling machines, which is accompanied by the impact sound of the cutting drum bits hitting the surface of the pavement, has various effects on the daily lives of residents and workers. For example, noise not only reduces the quality of sleep, but also impairs concentration and memory, causing stress and irritability. It can also cause hearing loss and hearing loss, and some research has shown that it increases the risk of lifestyle-related diseases such as heart disease and high blood pressure, which is a problem that has a significant impact on the health and happiness of residents.

[0008] Therefore, a technical problem arises that must be solved in order to provide a low-noise cutting device by reducing the cutting noise generated when the cutting machine device cuts the surface portion of the paved road surface, and the present invention aims to solve this problem. [Means for solving the problem]

[0009] The present invention has been proposed to achieve the above-mentioned object, and the invention described in claim 1 is a low-noise cutting device that cuts a surface portion of a paved road surface by lowering a liftable cutting drum until it abuts against the surface portion of the paved road surface and moving with the rotation of the cutting drum, and provides a low-noise cutting device comprising: a cutting device main body having a cutting drum chamber that houses the cutting drum so that it can be lifted and lowered; and noise suppression material having sound-absorbing and sound-proofing properties that is attached to cover each of the side and top surfaces of the cutting drum chamber.

[0010] According to this configuration, the noise suppression material is attached to the outside of the cutting drum chamber, covering almost the entire outer periphery of the side and top surface of the cutting drum chamber from the outside. Therefore, the cutting noise generated inside the cutting drum chamber is absorbed and blocked by the noise suppression material, so the volume of the sound leaking to the outside is reduced, resulting in low noise. This makes it possible to realize a low-noise cutting device.

[0011] The invention described in claim 2 provides a low-noise cutting device having the configuration described in claim 1, in which the noise suppression material is a flexible cover formed by covering the outside of the sound-absorbing material and the sound-proofing material with a skin material and integrating them together, and which is divided into multiple pieces and can be assembled into a predetermined shape by connecting the joining means provided at corresponding positions.

[0012] According to this configuration, the sound absorbing material and the sound insulating material are covered with a skin material on the outside to form a flexible cover that is integrated, and since it is divided into multiple pieces, it is easy to handle. Also, by connecting the joint means provided at the corresponding positions, it can be easily assembled into a desired shape. Effect of the Invention

[0013] According to the present invention, the cutting noise generated in the cutting drum chamber is absorbed and insulated by the noise suppression material attached to cover the side and top of the cutting drum chamber, and is suppressed so as not to leak out of the cutting drum chamber, so that the amount of noise leaking out of the cutting drum chamber is reduced, thereby achieving low noise. This makes it possible to achieve a low-noise cutting device. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a side view of a road milling machine shown as an example of a low-noise cutting device according to an embodiment of the present invention, and shows a schematic diagram of the position where a noise suppression material is attached. [Diagram 2] FIG. 2 is a perspective view of the road milling machine as a whole seen from the rear, showing the position where the noise suppression material is attached. [Diagram 3] FIG. 2 is a perspective view showing an example of a noise suppressing material that is attached to cover the cutting drum chamber of the road milling machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] In order to achieve the object of providing a low-noise cutting device by suppressing the driving noise generated when the cutting device cuts the surface portion of a paved road surface, the present invention provides a low-noise cutting device that cuts the surface portion of a paved road surface by lowering a liftable cutting drum until it comes into contact with the surface portion of the paved road surface and then moving accompanied by the rotation of the cutting drum, and has been realized by comprising a cutting device main body having a cutting drum chamber in which the cutting drum is housed so that it can be lifted and lowered, and noise suppression material having sound-absorbing and sound-proofing properties that is attached to cover the side and top surfaces of the cutting drum chamber. EXAMPLES

[0016] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following embodiment, when the number, value, amount, range, etc. of components are mentioned, the number is not limited to the specific number, and may be more or less than the specific number, unless otherwise specified or when it is clearly limited to a specific number in principle.

[0017] In addition, when referring to the shape or positional relationship of components, etc., this includes things that are substantially similar or approximate to those shapes, etc., unless otherwise specified or considered to be clearly different in principle.

[0018] In addition, the drawings may exaggerate characteristic parts to make the features easier to understand, and the dimensional ratios of the components may not be the same as the actual ones. In addition, in cross-sectional views, hatching of some components may be omitted to make the cross-sectional structure of the components easier to understand.

[0019] In the following description, the expressions indicating directions such as up, down, left, right, etc. are not absolute, but are appropriate when each part of the low noise road milling machine of the present invention is in the posture depicted, but if the posture is changed, the interpretation should be changed accordingly. Also, the same elements are given the same symbols throughout the description of the embodiments.

[0020] Figures 1 and 2 show a road milling machine 10 shown as one embodiment of a low-noise cutting device according to the present invention, with Figure 1 being a side view showing the external appearance of the entire road milling machine, and Figure 2 being a perspective view of the entire road milling machine as seen from the rear. In the following explanation, the left side in the left-right direction of Figure 1 will be referred to as the front side in the front-to-rear direction of the road milling machine 10, the right side as the rear side, the up-down direction as up-down, and the direction perpendicular to the paper surface as left-right.

[0021] 1 and 2 has a road milling machine body 11 equipped with an engine (not shown). The road milling machine body 11 of the road milling machine 10 has running wheels 12 (front wheels 12A, rear wheels 12B, rear wheels 12C) at the front and rear positions on the left and right, respectively, and the running wheels 12 are rotated by the driving force of the engine to enable self-propelling.

[0022] In addition, a cutting drum box 14 with a cutting drum chamber 13 provided therein is attached to the road surface milling machine body 11 between the front wheels 12A and the rear wheels 12B. In the cutting drum chamber 13, a relatively long cutting drum 15 (see FIG. 1) with cutting bits provided on the outer periphery for cutting the surface portion of the paved road surface is arranged in the left-right direction (vehicle width direction). Furthermore, a ground roller 16 capable of contacting the surface portion of the paved road surface is attached to the underside of the cutting drum box 14. When cutting work is not being performed, the cutting drum box 14 rises to a position (position in FIG. 1) where the ground roller 16 is far away from the surface portion of the paved road surface, and retreats together with the cutting drum 15. That is, the cutting drum box 14 and the cutting drum 15 housed in the cutting drum chamber 13 of the cutting drum box 14 are attached to the road surface milling machine body 11 so as to be able to move up and down and slide left and right.

[0023] On the other hand, when cutting work is being performed, the road surface milling machine body 11 is lowered until the ground contact roller 16 comes into contact with the surface portion of the paved road surface, and the cutting drum 15 is also lowered until it comes into contact with the surface portion of the paved road surface. Then, the cutting drum 15 is rotated by the driving force of the engine that realizes the self-propelled road surface milling machine body 11, and this rotation causes the cutting drum 15 to cut the surface portion of the paved road surface with cutting bits attached to the outer circumferential surface.

[0024] The cutting material cut by the cutting drum 15 is sent onto a first belt conveyor (not shown) provided on the road surface milling machine body 11, and is sent to the front of the road surface milling machine body 11 by the first belt conveyor, and is further transported onto a transport vehicle (truck) (not shown) via a conveyor device 17 having a second belt conveyor provided at the front of the road surface milling machine body 11. When the cutting work by the cutting drum 15 is completed, the cutting drum 15 and the cutting drum box 14 are returned to the raised position shown in FIG.

[0025] Incidentally, in this type of road milling machine 10, in addition to noise from the engine, there is a problem with the cutting noise generated when the cutting drum 15 is rotated at high speed to cut the surface part of the paved road surface. Therefore, in the road milling machine 10, as shown in Figures 1 and 2, a noise suppressing material 30 is attached to the outside of the cutting drum chamber 13, covering almost the entire outer periphery of the side and top surface of the cutting drum chamber 13, as a structure to reduce the cutting noise generated when the cutting drum 15 cuts the surface part of the paved road surface from being emitted to the surroundings.

[0026] The noise suppression material 30 is attached outside the cutting drum chamber 13 so as to cover almost the entire outer periphery of the side and top surface of the cutting drum chamber 13 from the outside with almost no gaps, and an example of this is shown diagrammatically in Figure 3.

[0027] The noise suppressing material 30 shown in FIG. 3 is a flexible cover having sound absorbing and sound insulating properties. The noise suppressing material 30 is a cover that incorporates a needle glass cloth mat having a thickness of, for example, about 25 mm and a butyl-based sheet having sound insulating properties, for example, about 2 mm, on the inside, and is covered with a skin material such as a silicon glass cloth on the outside. The noise suppressing material 30 is divided into a plurality of pieces, and has a first noise suppressing material 30A that covers and is attached to both the left and right side surfaces of the cutting drum box 14, a second noise suppressing material 30B that covers and is attached to the front, rear and top surfaces of the cutting drum box 14, and a third noise suppressing material 30C that is attached to and covers the side surfaces of the ground roller 16 attached to the lower part of the cutting drum box 14.

[0028] The first noise suppressing material 30A, the second noise suppressing material 30B, and the third noise suppressing material 30C are provided with joining means (e.g., hook-and-loop fasteners, etc.) at positions corresponding to each other. When the noise suppressing material 30 is attached to the road surface milling machine body 11, the first noise suppressing material 30A, the second noise suppressing material 30B, and the third noise suppressing material 30C are combined in a predetermined position, in a predetermined order, and in a predetermined shape using the joining means provided on the noise suppressing material 30, so that the noise suppressing material 30 is attached in a state in which the entire outer periphery of the side and upper surfaces of the cutting drum chamber 13 is covered with the noise suppressing material 30. In this embodiment, the noise suppressing material 30 is disclosed as being divided into three parts, the first noise suppressing material 30A, the second noise suppressing material 30B, and the third noise suppressing material 30C. However, the noise suppressing material 30 may be an integrated structure or may be divided into other than three parts.

[0029] Therefore, in the structure of the road milling machine 10 in which the noise suppression material 30 covers almost the entire outer periphery of the side and top surfaces of the cutting drum chamber 13 from the outside with almost no gaps, cutting noises such as the impact sound (impact sound) generated when the cutting drum bit hits the surface part of the paved road surface when the cutting drum 15 cuts the surface part of the paved road surface, the scratching sound generated when scraping off the surface part of the paved road surface, and the impact sound (impact sound) generated when the cutting material hits the inner wall surface of the cutting drum chamber 13 are absorbed and insulated by the sound absorbing material and sound insulating material of the noise suppression material 30 that covers the cutting drum chamber 13 from the outside, and the noise emitted to the outside can be reduced. This makes it possible to realize a low-noise cutting device.

[0030] The present invention can be modified in various ways without departing from the spirit of the present invention, and it is natural that the present invention covers such modifications. [Explanation of symbols]

[0031] 10: Road milling machine (low noise milling device) 11: Road milling machine body 12: Running wheel 13: Cutting drum room 14: Cutting drum box 15: Cutting drum 17: Conveyor device 18: Engine room 19: Engine hood 20: Air intake 21: Exhaust port 30: Noise suppression material 30A: No. 1 noise suppression material 30B: Second noise suppression material 30C: The third noise suppression material

Claims

1. A low-noise cutting device that cuts a surface portion of a paved road surface by lowering a cutting drum that can be raised and lowered until it contacts the surface portion of the paved road surface and moving the cutting drum with rotation, A cutting device body having a cutting drum chamber in which the cutting drum is housed so as to be liftable and lowerable; and a noise suppression material having sound absorbing and sound insulating properties, which is attached to cover each of the side and top surfaces of the cutting drum chamber. A low noise cutting device.

2. The noise suppression material is a flexible cover formed by covering the outside of a sound absorbing material and a sound insulating material with a skin material and integrating them, and is divided into a plurality of pieces, and is configured so that they can be assembled into a predetermined shape by connecting the pieces together at joint means provided at corresponding positions.

2. The low noise cutting device according to claim 1.

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