JP2003184028A - Circularly cutting device and circularly cutting method for pavement surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently carry out cooling of a cutting blade and collection of cutting dust generated at the time of cutting. <P>SOLUTION: There is provided a circularly cutting device for a pavement surface, according to which a rotatively driven main shaft is arranged on a base stand in a vertically movable manner, and one end of a radially protruding arm is fixed to a lower end of the main shaft, followed by fixing a cutting blade to the other end of the arm. Then, the rotatively driven main shaft is arranged above the center of a circularly cut portion of the pavement surface, and driven for rotation during its lowering operation, followed by moving the cutting blade via the arm along a circumference of the circularly cut portion, to thereby circularly cut the pavement surface. Further, a cover for covering the cutting blade except for a road-side lower end surface, is attached to the arm, and a sucking-type dust collector is mounted on the base stand, followed by connecting a suction passage of the sucking-type dust collector to a suction port formed in the cover. Then, cutting dust scattering in the cover is collected into a cutting dust accumulating container of the sucking-type dust collector, and at the same time the cutting blade is cooled by air flow generated by suction of the cutting dust. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paving road surface circular cutting apparatus and a circular cutting method for cutting a paved road surface of a road into a circular shape, and more particularly, to easily and reliably perform processing of cutting powder and cooling of a cutting blade. Is.

[0002]

2. Description of the Related Art Conventionally, when a manhole is installed on a paved road surface, a paved road surface circular cutting device (hereinafter referred to as a cutting device) is used to cut the paved road surface into a circular shape at the manhole installation position. As a cutting device of this type, the applicant of the present invention has already disclosed the patent No. 3115131 shown in FIG.
Issue. The cutting device in FIG. 15 rotates about an axis 80a as a rotation axis and can move up and down along with a drive spindle 80.
One end of an arm 81 protruding in the radial direction is fixed to the lower end of the arm 81, and a cutting blade 82 is fixed to the other end of the arm 81. The cutting blade 82 has a circumference of a cutting circle C as the drive spindle 80 arranged perpendicularly to the paved road surface R passes through the center point P of the road surface circular cutting portion Ra so that the axis 80a of the drive spindle 80 passes through. As the drive spindle 80 descends, the cutting blade 82 advances in the depth direction to cut the pavement road surface in a circular shape.

When the tip of the cutting blade 82 gradually cuts into the paved road surface R and penetrates to the back side of the paved road surface R, the road surface circular cut portion Ra is separated from the paved road surface R.
After the road surface circular cut portion Ra separated from the paved road surface R is taken out from the paved road surface R, a manhole is installed in a circular hole opened in the paved road surface R.

In the above cutting device, the cutting blade 8 is used during cutting work.
In order to suppress the overheating of No. 2, as shown in FIG. 16, the drive main shaft 80 is a hollow shaft, and the cooling water is circulated from the upper end opening to the lower end opening through the hollow hole 80b. The arm 81 connected to the lower end of the drive main shaft 80 is also a hollow shaft, and the hollow hole 81a of the arm 81 is used as the drive main shaft 8.
0 hollow hole 80a to communicate with the cooling water supply passage,
Cooling water is jetted to the cutting blade 82 connected to the arm 81.

[0005]

However, when the cutting blade 82 is cooled by jetting cooling water as described above, scattered cutting powder becomes muddy and adheres to the cutting portion, and the muddy substance is removed. There is a problem that the work is troublesome, and scattered muddy water flows to cause an environmental problem. Further, a water storage tank for supplying cooling water is also required, and when the stored cooling water runs out, it is necessary to replenish it, which causes a problem in delaying the cutting work of the pavement.

The present invention has been made in view of the above-mentioned problems, and the cutting blade is efficiently cooled by a dry method without using cooling water, and the cutting dust is not scattered to the outside. The task is to do.

[0007]

In order to solve the above-mentioned problems, according to the present invention, one end of a radially projecting arm is fixed to the lower end of a rotary drive main shaft that is vertically movable.
A cutting blade is fixed to the other end of the arm, the rotary driving main shaft is arranged above the center of the circular cutting portion of the paved road surface, and is driven to rotate while being lowered, and the cutting blade is circularly moved through the arm to form a circle of the circular cutting portion. A structure was adopted in which the road surface was circularly cut by moving along the circumference, and a cover for covering the cutting blade except the road surface side lower end surface was attached to the arm, and a blower and the blower were connected to the base. Equipped with a suction dust collector equipped with a cutting powder storage container, the suction flow path connected to the cutting powder storage container of the suction dust collector is communicated with the suction port provided in the cover, and the cutting powder scattered in the cover Provided is a circular cutting device for a paved road surface, characterized in that the cutting powder is collected from the suction port by a suction force into the cutting powder storage container, and at the same time, the cutting blade is cooled by a flow of air accompanying suction of the cutting powder. There.

Since the above cutting device is mounted on a truck or the like and conveyed to a circular cutting position on the pavement surface, the base is composed of a truck carrier or a horizontally opened rear door.
You may provide the base which protrudes from the pavement road surface for a cutting device. In the above cutting device, when cutting the paved road surface by moving the cutting blade in the circumferential direction, the suction dust collector causes the cutting powder generated along with the cutting to be strong from the suction port that communicates with the cover that covers the outer periphery of the blade. Since it continues to collect dust with a strong suction force, cutting powder does not scatter on the road surface and pollute the road surface,
No environmental problems occur during construction work. Moreover, at the same time, the cutting blade can be cooled by strong suction by the suction dust collector.

A hose connected to the cutting powder accumulating container of the suction dust collector is connected to a suction passage provided along the axis of the drive spindle, and the suction passage of the drive spindle is provided along the axis of the arm. The suction passage is connected to the suction passage, and the tip of the suction passage is opened to the suction port of the cover. As described above, since the air is sucked through the gap between the lower end of the cover and the road surface using the blower, the line cost can be reduced as compared with the case where the compressor is used, and the enlargement of the device can be suppressed.

Alternatively, a hose connected to the cutting powder accumulating container is connected to a pipe which is laid along the drive main shaft and then along the axis of the arm, and the tip of the pipe is connected to the suction port of the cover. You may open. In this case, if the pipe that runs along the arm is formed of a slidable split pipe, the pipe can be made to follow the arm that expands and contracts according to the diameter of the circular cutting portion. Also,
Since the blower and the cutting powder accumulating container are fixed on the base, the hose connected to the cutting powder accumulating container is connected to the drive main shaft and a pipe along the arm via a rotary joint. When the pipe is directly connected to the suction port of the cover as described above, it is not necessary to form the drive main shaft and the arm as a large diameter pipe.

The cutting blade is perpendicular to the road surface, and the circular cutting surface is perpendicular to the road surface. Specifically, the cutting tip is fixed to the lower end of the vertical cutting blade. A super hard diamond tip is preferably used as the cutting tip.

The cutting blade may be a conical surface which is inclined toward the center of the circular cutting portion of the paved road surface and whose diameter is reduced downward. Specifically, the cutting blade is provided with a cutting tip swingably attached to a vertical support portion connected downward to the arm tip, and the cutting tip is inclined toward the center of the circular cutting portion of the paved road surface. ing. Alternatively, a right-angled triangular cutting tip may be fixed to the lower end of the support portion.

By inclining the cutting blade as described above, the cutting surface has a conical shape, and the cut road surface circular cutting portion can move upward but does not fall downward.
The circular cut surface of the road can be easily removed from the road.

The lower end of the cover that covers the cutting blade is arranged with a gap for intake between it and the paved road surface. In this way, when an air intake gap is opened between the cover and the paved road surface, a sufficient amount of fresh air constantly hits the lower end cutting tip of the cutting blade, passes through the inside of the cover, and communicates with the upper part of the cover. It rapidly flows into the suction port. Therefore, the cutting blade is always exposed to a rapid flow of a sufficient amount of low temperature air to be efficiently cooled. In this way, the flow of air sucked by the cutting powder alone causes the friction with the paved road surface to reach 600 ° C to 8 ° C.
The cutting blade heated up to the temperature of 00 ° C can be easily cooled without any expense or trouble.

Further, a filter is built in the cutting powder accumulating container, the cutting powder is accumulated in the cutting powder accumulating container, and the cutting powder is not contained in the intake air sucked by the blower through the hose. There is. If the exhaust from the blower is discharged into the cover surrounding the cutting blade, cooling of the cutting blade can be further promoted.

The cover is attached to the frame so as to be vertically movable and / or swingable, and a roller for sliding the road surface is attached to the lower portion of the cover, and the lower side portion of the roller is projected from the lower end of the cover for paving. It is preferable to provide the above-mentioned air intake gap with the road surface.

In order to prevent the cutting powder from scattering outside, it is preferable that the lower end of the cover be as close to the paved road surface as possible. However, if the lower end surface of the cover is grounded, the atmosphere cannot be sucked in. Therefore, the cover is attached to the frame so that it can move up and down and / or swing as described above, and the roller at the lower end is always grounded by its own weight, and By making the lower protruding portion of the roller protrude from the lower end of the cover, a gap for intake is secured. And,
By attaching the roller for sliding contact with the paved road surface, it is possible to prevent noise and wear of the cover by preventing the lower end surface of the cover from directly sliding contact with the paved road surface.

Further, according to the present invention, the cutting blade is rotated in the circumferential direction with respect to the circular cutting portion of the paved road surface to cut the paved road surface into a circular shape, and the cutting dust generated during the cutting is sucked by the suction dust collector. At the same time, a circular cutting method for a paved road surface is provided in which the cutting blade is cooled by a flow of air accompanying the suction.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in the drawings. 1 to 8 show a first embodiment, in which a paved road surface is used as a vertical cutting surface for circular cutting.

The cutting device 10 equipped with the above cutting blade 14 is
The vehicle 11 such as a truck is loaded on a loading platform 11a and conveyed to a working position, and at the working position, a rear lid 11b of the vehicle 11 is loaded.
Is opened and the rear lid 11b is held horizontally with the loading platform 11a, and the vehicle horizontal portion is used as a cutting device supporting surface. That is, in this embodiment, the rear door is used as a base. As shown in FIG. 1, the cutting device 10 has a road surface circular cutting portion R on a paved road surface R when mounted on a vehicle 11.
Drive spindle 1 with axis 12a passing through center point P of a
2, the arm 13 is radially projected from the lower end of the drive spindle 12, and the road surface R is cut into a circle C by a cutting blade 14 attached to the tip of the arm 13.

In order to center the drive spindle 12 at the center point P, the cutting device 10 is supported on the cutting device supporting surface of the vehicle 11 through positioning means for adjusting the position of the entire device in the front-rear direction and the left-right direction. . Rotational drive means is attached to the vertical movement means provided upright from the positioning means, and the rotation drive means drives the cutting means including the drive spindle 12, arm 13, and cutting blade 14.

The respective means of the cutting device 10 will be described in detail below.
First, the positioning means is the flat plate-shaped support base 15 of the cutting device 10.
Is movable in the front-rear direction X (vehicle length direction) and the left-right direction Y (vehicle width direction) (shown in FIG. 2). That is, the fixing pin 1 is attached to the rear portion of the luggage carrier 11a on the vehicle supporting surface and the rear lid 11b.
6a and 16b are provided to project, while insertion holes for inserting the fixing pins 16a and 16b are formed in the pair of left and right front and rear frames 17 at the lower end of the cutting device 10, and the fixing pin 1 is inserted into these insertion holes.
The cutting device 10 is fixed to the vehicle supporting surface by inserting 6a and 16b.

A screw shaft 18 which is rotatable and immovable in the front-rear direction is attached to the front and rear frame 17 through a bearing, and a handle 18a is attached to the tip of one screw shaft 18 and the left and right screw shafts 18 are transmitted. There is. A front-rear moving frame 19 having female screw holes to be screwed with the screw shaft 18 is provided, and the left and right screw shafts 20 are rotatably and immovably mounted on the upper surfaces of the pair of left and right front-rear moving frames 19 via bearings 19b. is doing. A handle 20a is attached to the tip of the screw shaft 20, and a left and right moving frame 21 having a screw hole to be screwed with the screw shaft 20 is provided, and the left and right moving frame 21 is fixed to the lower surface of the support base 15. In this way, the support base 15 is rotated in the front-rear direction by rotating the handle 18a of the screw shaft 18, and is rotated in the left-right direction by rotating the handle 20a of the screw shaft 20.

As shown in FIG. 3, the vertical moving means for lowering the cutting blade 14 of the cutting device 10 during the cutting operation is as follows.
On the upper surface of the support base 15, the lower ends of the two main columns 22 are attached to the main bearing 2.
The main pillars 22 are fixedly supported by 3 and juxtaposed upward, and the upper ends of these two main pillars 22 are connected by a connecting plate 24, and the intermediate portions are connected by a sleeve 25. The connecting plate 24
Further, the sleeve 25 is provided with screw holes 24a, 25a, and the feed screw 26 is penetrated through the screw holes 24a, 25a to be vertically attached. The large diameter upper portion 26a of the feed screw 26 is locked and held on the upper surface of the connecting plate 24, and a handle 27 is attached to the upper end. Lead screw 2
Reference numeral 6 loosely inserts the inside of the screw hole 24a, is screwed into the screw hole 25a, and rotates the handle 27 to move the sleeve 25 up and down.

The sleeve 25 has cylindrical portions 25b on both sides.
Is slidably fitted on the column 22, and the cylindrical portions 25b on both sides are
It has a shape having a central portion 25c having the screw hole 25a between them, and the rotation driving means is connected to the central portion 25c. That is, as shown in FIG. 4, a drive portion mounting frame portion 25d is provided on the front surface side of the central portion 25c, while a bearing portion 25e for rotatably supporting the drive spindle 12 is provided on the rear surface side thereof.

The rotation driving means is composed of a driving portion mounting frame portion 25.
d is a prime mover 30, a transmission 31 connected to the output shaft of the prime mover 30, and a V pulley 3 attached to the output shaft of the transmission 31.
2 is provided. On the other hand, the bearing 25e on the opposite side rotatably supports the upper end of the drive main shaft 12 and attaches the drive main shaft 12 in the vertical direction, and associates the V pulley 33 with the drive main shaft 12 with the V pulley 32. Installed and these V
A V-belt 34 is wound around the pulleys 32 and 33. In the figure, 35 is a pulley cover. A prime mover switch (not shown) is provided on the drive unit mounting frame 25d side. When the prime mover switch is turned on to drive the prime mover 30, the drive spindle 12 is indicated by an arrow in the figure via the transmission 31 and the V belt 34. To be rotated.

As shown in FIG. 5, a vertical coupling 13a is provided at one end of the arm 13, and the lower end of the drive main shaft 12 is inserted into the coupling 13a so that the bolt 36
It is fixed by. From the lower end of the coupling 13a, a cutting blade mounting portion 13b is provided which is inclined downward toward the outside and protrudes, and the tip thereof is bent vertically downward.

Coupling 1 coaxial with the drive main shaft 12
At the center of the bottom surface of 3a, a hook 37 is provided so as to project downward, and a hook 38 is attached to the hook 37. The plumb bob 38 moves the cutting device 10 in the front-rear direction and the left-right direction by the positioning means to position the cutting device 10 above the cutting center point P, thereby centering the drive spindle 12 at the center point P.

The arm 13 is divided into a base member 13-1 on the side where the coupling 13a is provided and a tip member 13-2 on the side where the cutting blade mounting portion 13b is provided, and these members 13-1 and 13-2 is slidably fitted, and is fixedly connected at a required position with a screw or the like (not shown). By adjusting the length L of the arm 13 in this way, the diameter of the circular shape to be cut can be adjusted. A diamond tip 42 is fixed to the lower edge of the cutting blade 14 by brazing.

The cutting device 10 is provided with a suction dust collector for absorbing cutting powder generated during cutting work. The suction dust collector, as shown schematically in FIG.
A blower 40 driven by 0, a cutting powder accumulating container 42 connected to the intake port of the blower 40 via a hose 41, and a hose 43 connecting to the cutting powder accumulating container 42. Members 13-1 and 13-2 that slidably connect the drive spindle 12 and the arm 13, and a member 13 on the tip end side
Each of the cutting blade mounting portions 13b of -2 vertically protruding downward is a hollow shaft that communicates with each other, and the hollow portion serves as a suction passage 44. A suction passage 44 is opened at the upper end of the drive main shaft 12, and the hose 43 is connected to the opening via a rotary joint 45.

As shown in FIGS. 5 and 6, the cutting blade 14 is provided with a cover 46 which covers the periphery except the lower part on the road surface side with a gap. The cover 46 is provided with slide holes 46b in the vertical direction, while the cutting blade mounting portion 13
A support shaft 13m is projectingly provided on a cover mounting portion 13k provided at the tip of b, and a slide hole 46b is hooked on the support shaft 13m to be detachably mounted in a vertically movable state. A suction port 46a is provided on the upper side of the cover 46, and the suction port 46a
The cutting blade mounting portion 13b that opens the suction passage 44 is inserted into a, and the inside of the cover 46 is communicated with the suction passage 44. A roller 48 for sliding contact with a road surface is provided under the cover 46.
Is rotatably supported, and the lower side portion 48a of the roller 48 is projected from the lower end of the cover 46 by a required dimension.

By making the cover 46 movable up and down within a required range defined by the slide hole 46b, the cover 46 is relatively moved with respect to the cutting blade 14 as the cutting depth of the cutting blade 14 becomes deeper. It is configured such that it rises and the roller 48 is always in contact with the ground, so that a required intake gap 49 is secured between the lower end of the cover 46 and the road surface R.

The cutting powder scattered in the cover 46 is the arm 1
3, the suction passage 44 in the hollow portion of the drive spindle 12, the hose 43
Is sucked into the cutting powder accumulating container 42. As shown in FIG. 7, the cutting powder storage container 42 has a filter F inside.
T is provided and the blower 4 is placed at a position after passing through the filter FT.
The hose 41 connected to 0 is attached, and the cutting powder is not sucked into the blower 40 and is stored in the container 42.

The blower 40 has a fan of 7,000 times /
It has a very strong suction force that rotates at a speed of from min to 8000 times / min. When the blower 40 is started, the blower 40 is cut along the path of the suction gap 49 at the lower end of the cover 46, the cover 46, the suction passage 44 in the hollow portion of the arm and the drive spindle, the hose 43, the cutting powder accumulating container 42, the hose 41, and the blower 40. A large amount of air containing powder (outside air) is sucked at high speed.

The lid 42a of the cutting powder storage container 42 can be opened and closed by a one-touch operation. That is, as shown in FIG. 8, when the lower end of the handle HD whose upper end is pivotally supported by the support bar SB is grasped and turned upward as indicated by an arrow, the lid is closed as shown in FIG. 7B. As the bending rod RD attached to 42a is pulled up along with the handle HD, only the lid 42a is lifted and the lid 42a of the cutting powder accumulating container 42 is opened. When the lid 42a is opened, the cutting powder accumulated in the cutting powder storage container 42 is taken out and cleaned up. When the cutting powder is cleaned up and the lid 42a is closed, the lid 42a is simply pressed against the cutting powder storage container 42 from above.

Next, an operation process of the paved road surface circular cutting device having the above-mentioned structure will be described. First, as shown in FIG.
1 is stopped near the lid 1 of the manhole, and then the rear lid 11
b is opened to open the rear portion of the loading platform, and the cutting device is fixed to the support surface including the rear lid 11b and the rear end of the loading platform.

The length L of the arm 13 of the cutting device 10 and the cutting blade 14 attached to the tip of the arm 13 are set in advance so as to correspond to the cutting circle corresponding to the diameter of the manhole cover 1. The length L of the arm 13 may be adjusted and then the required cutting blade 14 may be selected and attached. Next, the plumb bob 38 is attached to the hook 37, and the plumb bob 38 is positioned above the center of the cutting circle so that the handles 18a and 2 of the positioning means are positioned.
The support base 15 is moved by rotating 0a and 0a. And,
Rotate the handle 27 of the feed screw 26 for vertical movement,
The diamond tip 42 at the lower end of the cutting blade 14 descends to a position where it contacts the road surface.

After the above centering is completed, the prime mover 3
Start 0. Then switch on the transmission 31,
The drive spindle 12 is rotated in the horizontal direction. The rotation of the drive spindle 12 causes the arm 13 to rotate about the circular center point P as a fulcrum, the cutting blade 14 to move along the circumference, and the diamond tip 42 at the lower end pushes the road surface into a circular shape.
After that, the handle 27 is rotated to lower the cutting blade 14, and the prime mover 30 moves the cutting blade 14 along the circumference to cut and cut the paved road surface. Depending on the cutting depth, the cutting blade 14 is moved a required number of times along the entire circumference to perform annular cutting with a predetermined depth as shown in FIG.

During the above cutting operation, the blower 40 is driven by the prime mover 30, and the cutting powder scattered in the cover 46 is continuously sucked into the cutting powder storage container 42. In this way, the cutting powder is sucked up by the suction dust collector and quickly collected, so that there is no concern that the cutting powder scatters on the road surface and pollutes the road surface.

On the other hand, due to the strong suction force of the blower 40 of the suction dust collector, a sufficient amount of fresh air is constantly produced.
The inside of the cover 46 is sucked through the suction gap 49 on the lower side, and rapidly flows into the suction port communicating with the upper portion of the cover 46. Therefore, in particular, the diamond tip 42 attached to the lower end of the cutting blade 14 is always exposed to a sufficient amount of rapid flow of low temperature air. In this way, the diamond chip heated to, for example, 600 ° C. to 800 ° C. due to friction with the paved road surface R can be efficiently cooled by the flow of air accompanying suction of cutting powder.

If a hose connecting the exhaust port of the blower 40 and the inside of the cover 46 is provided, the exhaust gas discharged from the blower can be applied to the cutting blade 14 to further enhance the cooling effect of the cutting blade 14. it can. As a result, the cutting blade 14
It is possible to prevent overheating, and increase the cutting speed to quickly cut the paved road surface in a circular shape.

FIG. 9 is a schematic explanatory view of a main portion of the second embodiment, in which the drive main shaft 12 and the arm 13 are replaced by the drive main shaft 12 and the arm 13 instead of providing the suction passage of the suction dust collector in the hollow part of the drive main shaft and the arm.
A pipe 50 attached along the line is used. One end of the pipe 50 has a hose 4 connected to the cutting powder storage container 42.
3 are connected via a rotary joint 45, and the other end of the pipe 50 is connected to a suction port 46a provided on the upper surface of the cover 46.

As described above, the pipe 50 serves as the suction passage.
If it is used, it is not necessary to form the drive main shaft 12 and the arm 13 as thick pipes, and even when the pipe 50 is clogged, the repair can be easily performed.

10 to 14 show a third embodiment.
In the cutting device 10 ′ of the third embodiment, the cutting blade 14 ′ that cuts the road surface R is not perpendicular to the road surface, but the circular cutting portion R
The circular cut surface C has a conical shape by inclining downward toward the center P of a. The cutting blade driving mechanism is the same as that of the first embodiment, except that the cutting blade 14 'is inclined with respect to the paved road surface. The dust collection of the cutting powder generated by the cutting work and the cooling of the cutting blade are the same as in the first embodiment, and the blower 40, the cutting powder accumulating container 42, and the cover 46 'for covering the cutting blade are provided, and the cover 46' is provided. The cutting powder is scattered inside, and dust is collected in the cutting powder storage container 42 by the blower 40.

As shown in FIG. 11, the cutting blade 14 'is attached to the other end of the arm 13 so that the cutting edge of the cutting blade is directed obliquely inward. That is, the cutting blade 14 'is attached to the holder 61.
On the other hand, the holder 61 is integrally attached to an inclined plate 63 whose center portion is rotatably supported by a pin 62 vertically provided on the tip of the arm 13. As the tilt plate 63 rotates around the pin 62, the holder 61 integrally rotates and tilts.
The cutting edge of the cutting blade 14 'fixed to No. 1 is directed inward. Therefore, the inclination angle θ of the inclined plate 63 matches the degree of inclination of the cutting blade 14 ′ (degree of inward inclination).

The cutting blade 14 'is shown in FIGS.
As shown in FIG. 7, a cutting blade 14a ′ made of a diamond tip is attached to the lower edge of the cutting blade body 14c having a substantially rectangular shape.
It is fixed by brazing to have excellent cutting performance.
The cutting edge 14a 'at the lower end serves as a cutting edge for cutting the road surface, and the side surface edge of the cutting blade body 14c' becomes the inclined cutting edge surface 14b ', and the pavement surface cut by the cutting edge cutting edge 14a' at the tip. I try to cut into the inner surface of the car.

The degree of inclination of the cutting blade 14 'is adjusted by adjusting the inclination angle θ of the inclined plate 63 by the hydraulic cylinder 64 provided inside the arm 13'. That is, the pin 64a that is moved left and right by the hydraulic cylinder 64 is fitted into and engaged with the elongated hole 63a provided on the upper end side of the inclined plate 63.
4, the pin 63a moving to the right moves upward in the elongated hole 63a while pushing the inclined plate 63, and the inclined plate 63 pushed by the pin 63a moves to the pin 6a.
Rotate to the right with 2 as the fulcrum The tilt angle θ of the tilt plate 63 increases as the pin 63a moves to the right.

Further, on the outside of the holder 61, there is provided a hydraulic cylinder 65 as a moving drive means for moving the cutting blade 14 'straight in an obliquely inward direction. The hydraulic cylinder 65 causes the holder to linearly move in an oblique inward direction. The cutting blade 14 ′ is also configured to move straight in an obliquely inward direction as it goes.

As shown in FIG. 13, the inclined plate 6 is
3 is provided with a cover mounting portion 63a protruding from the cover mounting portion 6a.
A cover 46 'that covers the inclined plate 63 and the cutting blade 14' is attached to 3a 'so as to be movable up and down as in the first embodiment. That is, the support shaft 63b protruding from the cover attachment portion 63a is inserted into the elongated hole 46b 'formed in the cover 46'. A roller 48 'is attached to the lower end of the cover 46' so that a gap 4 for intake is provided between the cover 46 'and the road surface.
I'm opening 9 '. Since the cutting blade 14 ′ is inclined to the road surface R, the inner wall 46c ′ corresponding to the inner peripheral side of the circular cutting portion Ra is provided on the outer peripheral side in order to allow the lower end portion of the cover 46 ′ covering the cutting blade 14 ′ to follow the road surface R. It is longer than the outer wall 46d ', and the inner and outer walls 46c' and 46d 'are inclined with respect to the road surface R.

A suction port 46a 'is provided above the cover 46'.
Is provided, the tip of a pipe 66 piped along the arm and the rotation main shaft is communicated with the suction port, and the pipe 66 and the hose 43 connected to the cutting powder accumulating container 42 are connected,
The point that the cutting powder accumulating container 42 is connected to the blower 40 via the hose 41 is the same as in the first embodiment.

In the third embodiment, the cutting blade 14 'is pushed obliquely inward to move straight, and along with the rotation of the drive spindle, the cutting blade 14' moves along the circumference of the cutting blade 14 '. The diamond tip 14a 'cuts the road surface R in a circular shape. Cutting blade 14 'depending on the cutting depth
Is moved along the entire circumference a required number of times to perform a circular cut C having a predetermined depth of cut surface.

On the peripheral surface of the cutting circle C cut by the cutting blade 14 in this manner, as shown in FIG. 14, the diameter of the cutting circle gradually decreases from the upper side to the lower side, and the diameter of the lowermost side is reduced. The diameter of the cut circle is the smallest. as a result,
The cut road surface circular cutting portion Ra cannot move to the lower side by hitting the road surface non-cutting portion Rb even though it can move to the upper side, and the cut surface on the side of the road surface circular cutting portion Ra is the road surface non-cutting portion Rb. Since the cut surface circular cut portion Ra can be received from below by the cut surface on the side of and the situation where the cut road surface circular cut portion Ra moves toward the ground G and falls is avoided, the cut road surface circular cut portion Ra is taken out. Is easy.

During the above cutting operation, the cutting powder generated by the cutting by the cutting blade 14 'is scattered in the cover 46' and is collected in the cutting powder accumulating container 42 'by the suction force of the blower 40, and at the same time, the cutting blade 14' is cut. 'Is cooled by the inflowing outside air.

When the cover 46 'has an upper part and a lower part separated from each other and slidably connected to each other and the inclination angle of the cutting blade 14' is changed, the cover 46 'is changed in accordance with the inclination angle.
It is preferable to change the lengths of the inner side wall and the outer side wall so that the roller attached to the lower end of the lower part can always be grounded.

[0055]

As is apparent from the above description, according to the circular paving road surface cutting device of the present invention, the suction dust collector is mounted and the outer peripheral surface of the cutting blade is covered except for the lower part on the paving surface side. The suction port of the suction dust collector is opened at the upper part of the cover to suck air through the inside of the cover, and the cutting powder scattered in the cover is collected from the suction port to the suction dust collector, so the cutting powder is scattered on the road surface. The road surface does not get dirty. In addition, due to the rapid air flow associated with the suction of the cutting powder, the temperature-raised blade can be cooled easily without any expense or trouble.

By providing a roller for sliding contact with the road surface on the lower end of the cover, an air intake gap can be easily provided between the cover and the road surface. Further, a circular cut portion such as a manball can be easily cut by making the cut surface vertical or inclined.

[Brief description of drawings]

FIG. 1 is a front view showing a state where a paving road surface circular cutting device according to a first embodiment of the present invention is mounted on a vehicle to perform cutting work.

FIG. 2 is a schematic plan view showing a positioning means of the cutting device.

FIG. 3 is a side view of the cutting device.

FIG. 4 is an enlarged front view of a main part of a drive unit of the cutting device.

FIG. 5 is a cross-sectional view showing a cutting situation by a cutting blade.

6A is a cross-sectional view showing the relationship between a suction dust collecting cover and an intake passage, and FIG. 6B is a schematic side view of the cover.

FIG. 7A is a front view of the cutting powder storage container, and FIG. 7B is a front view with the lid open.

FIG. 8 is an explanatory diagram showing a cut state of a paved road surface.

FIG. 9 is a schematic view of a suction dust collecting mechanism of a second embodiment.

FIG. 10 is a front view showing a cutting device cut into a vehicle according to a third embodiment.

FIG. 11 is a partial front view showing the periphery of the arm of the cutting device.

FIG. 12 shows a cutting blade according to a third embodiment,
(A) is a side view and (B) is a front view.

FIG. 13 is a schematic view of a suction dust collecting mechanism in the third embodiment.

14A and 14B are cross-sectional views showing a cutting situation by a cutting blade in the third embodiment.

FIG. 15 is a perspective view showing a main configuration of a conventional cutting device.

FIG. 16 is a schematic cross-sectional view showing a conventional cutting blade cooling mechanism.

[Explanation of symbols]

10 cutting device 12 Drive spindle 13 arms 14,14 'cutting blade 40 blower 42 Cutting powder storage container 46 cover 48 Roller 49 gap C cutting circle R paved road surface Ra Road surface circular cutting part Rb Road surface non-cutting part

Claims (8)

[Claims] 1. An end of an arm projecting in a radial direction is fixed to a lower end of a rotary drive spindle that is vertically movable on a base,
A cutting blade is fixed to the other end of the arm, the rotary driving main shaft is arranged above the center of the circular cutting portion of the paved road surface, and is driven to rotate while being lowered, and the cutting blade is circularly moved through the arm to form a circle of the circular cutting portion. A structure was adopted in which the road surface was circularly cut by moving along the circumference, and a cover for covering the cutting blade except the road surface side lower end surface was attached to the arm, and a blower on the base and the blower were connected. Equipped with a suction dust collector equipped with a cutting powder storage container, the suction flow path connected to the cutting powder storage container of the suction dust collector is communicated with the suction port provided in the cover, and the cutting powder scattered in the cover A circular cutting device for a paved road surface, characterized in that dust is collected in the cutting powder accumulating container from the suction port by a suction force, and at the same time, the cutting blade is cooled by a flow of air accompanying suction of the cutting powder. 2. A hose connected to the cutting powder storage container of the suction dust collector is connected to a suction passage provided along the axis of the drive spindle, and the suction passage of the drive spindle is provided along the axis of the arm. The circular cutting device for a paved road surface according to claim 1, wherein the circular cutting device is connected to a provided suction flow path, and a tip of the suction flow path is opened to a suction port of the cover. 3. A hose to which the suction dust collector is connected, the hose being connected to a pipe for piping along the drive main shaft and then along the axis of the arm, and the tip of the pipe for connecting to the cover. The suction port is open.
The paving road surface circular cutting device described in. 4. The cutting blade is perpendicular to the road surface, and the circular cutting surface is perpendicular to the road surface.
The circular cutting device for a paved road surface according to any one of 1. 5. The cutting blade is inclined toward the center of the circular cutting portion of the paved road surface, and the circular cutting surface is a conical surface whose diameter is reduced downward.
A circular cutting device for a paved road surface according to the item. 6. The lower end of the cover is arranged with an air intake gap between it and the paved road surface.
The circular cutting device for a paved road surface according to any one of 1. 7. The cover is attached to a frame so as to be movable up and down and / or swingable, a roller for sliding contact with a road surface is attached to a lower portion of the cover, and a lower portion of the roller is projected from a lower end of the cover. 7. The circular cutting device for a paved road surface according to claim 6, wherein the air intake gap is provided between the paved road surface and the paved road surface. 8. A circular cutting portion of a paved road surface is rotated in a circumferential direction to cut the paved road surface in a circular direction, and cutting powder generated at the time of the cutting is sucked by a suction dust collector and at the same time, the suction is performed. A circular cutting method for a paved road surface, in which the cutting blade is cooled by a flow of air accompanying.