JP5145251B2 - Asphalt chamfering grinder and hand chamfering machine using the same - Google Patents

Description

The present invention relates to an asphalt chamfering grinder and a hand chamfering machine using the same.

In general, when repairing an asphalt pavement surface, use an asphalt cutter to cut the boundary with the repair surface vertically, peel off the asphalt pavement on the repair surface side, and expose the underlying concrete surface and gravel surface. In addition, new asphalt is laid down and then restored by rolling.

The boundary with the repaired surface cut with this asphalt cutter is a vertical cut surface, so when new asphalt is laid, after about 6 months to 1 year, there is a problem of peeling from this connected boundary portion. there were.

For this reason, the present inventor attaches a grinder having a plurality of cutting bits projecting on the outer peripheral surface of a truncated cone-shaped rotating body to the side of the traveling device with the small diameter side facing downward, and rotates the grinder by the engine. Asphalt chamfering device (Patent Document 1) was developed first, in which a vertical cut surface of an asphalt pavement surface is obliquely polished into a tapered shape.

The inventor further improved the grinder and developed the grinder 1 shown in FIGS. This grinder 1 has a longitudinally concave curved surface 3 formed on the outer peripheral surface thereof with the small diameter side of the rotary body 2 having a hollow truncated cone shape facing downward, and is directed from the hollow portion 4 inside the rotary body 2 toward the outer peripheral surface. Thus, a plurality of through holes 5 are formed radially, and a hollow flat groove 20 is formed on the base end side of the through hole 5. A cutting bit 9 having a flat plate-like base 8 shown in FIG. 14 attached to the through-hole 5 is detachably penetrated from the inside of the hollow portion 4 into the through-hole 5 and is held by the concave groove 20. A cutting bit press frame 19 having a hollow truncated cone shape is detachably attached to the portion 4 so as to support the base 8 of the cutting bit 9 from the back side (Patent Document 2).

The grinder 1 is attached to the side of a traveling device 11 on which the engine 10 shown in FIG. 15 is mounted. First, the asphalt pavement surface 13 is cut vertically with an asphalt cutter in which a disk-shaped rotary cutter (not shown) is vertically attached. Thereafter, the asphalt pavement surface 13 on one side of the vertical cut surface 15 is peeled off. Next, the guide 16 of the traveling device 11 and the grinder 1 are brought into contact with the vertical cut surface 15. In this state, the grinder 1 is run while rotating, and the vertical cut surface 15 is obliquely polished to form a tapered polishing surface 15a. By forming the tapered polishing surface 15a in this way, the newly spread asphalt bites in well and the adhesiveness can be improved.

Since the cutting bit 9 is detachably attached to the through hole 5 of the rotating body, even if the cutting bit 9 is worn and shortened, it is worn by removing the flange 18 and pulling out the cutting bit presser frame 19. Since only the cutting bit 9 can be exchanged or the mounting position can be rotated, the cost of the cutting bit 9 which is a consumable can be reduced.

However, since a hollow flat groove 20 into which the flat base 8 of the cutting bit 9 is inserted is formed on the base end side of the through hole 5, the groove processing is extremely troublesome. In particular, when the inner diameter on the lower end side of the rotary body 2 having a hollow truncated conical shape is small, it is difficult to insert a cutting tool and it is difficult to process the groove 20.

As shown in FIG. 15, the asphalt chamfering device attached to the large traveling device 11 that is self-propelled has a low workability and a high cost when repairing in a short range of about several meters. There was a demand for a small chamfering device that can be handled by the company.

JP2003-328316 JP2008-121370

The present invention improves the above problems, and provides an asphalt chamfer grinder that can be manufactured easily and inexpensively even with a grinder having a small rotating body and a small inner diameter on the lower end side, and an engine in a holding frame that is held by hand. A hand chamfering machine that can hold a motor and hold a motor and attach a small chamfering grinder here to stably polish it.

An asphalt chamfering grinder according to claim 1 of the present invention has a hollow truncated cone-shaped rotating body with a small diameter side facing downward and an outer peripheral surface thereof formed into a vertical concave curved surface, and a hollow inside the rotating body. Of the cutting bit provided with a pedestal in which through holes extending from the portion toward the outer peripheral surface are opened in one row at intervals along the longitudinal direction of the rotating body and in a plurality of rows at intervals in the circumferential direction Is formed in a plurality of rows on the outer circumferential surface at intervals in the circumferential direction, and the longitudinal grooves for supporting the cutting bit base from the back side are removably penetrated from the inside to the outer circumference of the hollow portion. A cutting bit presser frame having a head cone shape is detachably inserted inside the hollow portion of the rotating body.

The asphalt chamfering grinder according to claim 2 of the present invention is characterized in that, in claim 1, a disk-shaped guide cutter having a concavo-convex portion formed on the outer periphery is horizontally attached to the small-diameter side end of the rotating body. It is what.

The asphalt chamfering grinder according to claim 3 of the present invention is the same as that of claim 2, wherein the flange is detachably joined to the large diameter side of the rotating body having a hollow frustoconical shape with a bolt and driven to the flange. A shaft attachment portion that is connected to the rotary shaft on the side is formed.

According to a fourth aspect of the present invention, there is provided a hand chamfering machine, wherein the shaft mounting portion of the asphalt chamfering grinder according to the third aspect is connected to the rotating shaft of the engine or motor, and the engine or motor is held by the hand. It is characterized by being attached to a frame.

The hand chamfering machine according to claim 5 of the present invention is the hand chamfering machine according to claim 4, wherein a disc is further attached to the upper part of the shaft mounting portion of the asphalt chamfering grinder, and the grinder is surrounded on the outer periphery thereof. A cover made of an elastic plate is attached.

According to the asphalt chamfering grinder according to claim 1 of the present invention, the pedestal of the cutting bit arranged in the vertical direction on the truncated cone-shaped rotating body is vertically arranged on the outer peripheral surface of the cutting bit presser frame. Since the base is supported by inserting it into the vertical groove formed on the back side, the processing of the rectangular concave groove that holds the base becomes unnecessary, and the truncated cone-shaped cutting bit press frame Machining is easy simply by forming vertical grooves on the outer peripheral surface. For this reason, since only the vertical grooves are formed on the outer peripheral surface, it can be reduced in size and manufactured at a low cost, and a plurality of pedestals can be formed simply by inserting the cutting bit presser frame into the hollow part of the hollow frustoconical rotating body. Can be fixed with one touch. Since the grinder can be reduced in size and weight in this way, a hand chamfering machine capable of polishing while holding the engine and motor by hand has become possible.

In addition, the outer peripheral surface of the rotating body is formed in a vertical concave curved surface, and a plurality of cutting bits are provided at intervals in this manner, so even if the tip of the cutting bit becomes worn and shortens, Since the tip of the cutting bit reliably hits the cutting surface while preventing the outer peripheral surface from being worn out by hitting the cutting surface of the asphalt, it can be polished over a long distance.

In addition, since the cutting bit is detachably attached to the through hole of the rotating body, even if the cutting bit becomes worn and shortened, only the worn cutting bit can be replaced or the mounting position can be rotated so that it is a consumable item. It is possible to reduce the cost of the cutting bit.

According to the asphalt chamfering grinder according to claim 2, since the disk-shaped guide cutter having the uneven portion formed on the outer periphery is horizontally attached to the small diameter side end portion of the rotating body, the guide cutter also rotates integrally. As the guide cutter is inserted into the lower part of the tapered polishing surface, the guide cutter is inserted into the lower part of the taper polishing surface and the grinder does not swing up and down. Can be formed.

Further, according to the asphalt chamfering grinder according to claim 3, the flange is detachably joined to the large diameter side of the rotating body with a bolt, and the shaft mounting portion connected to the driving side rotating shaft is formed on the flange. It is easy to connect to the rotating shaft on the drive side.

According to the hand chamfering machine of claim 4, the grinder reduced in size and weight is connected to the rotating shaft of the engine or the motor, and is attached to the holding frame that holds the engine or the motor by hand, thereby holding it by hand. However, it is effective when polishing a short distance.

According to the hand chamfering machine of claim 5, a disk is attached to the upper part of the shaft mounting portion of the grinder, and a cylindrical cover formed of an elastic plate is attached to the outer periphery so as to surround the grinder. Therefore, the periphery of the grinder is a sealed space, and it is possible to prevent the generated dust from scattering to the outside and to maintain a favorable work environment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, the rotating body 2 having a hollow truncated conical shape is formed with a hollow portion 4 that opens on the small diameter side and the large diameter side. The rotating body 2 has through-holes in one row at intervals along the longitudinal direction of the rotating body 2 from the inside of the hollow portion 4 toward the outer peripheral surface, and in a plurality of rows at intervals in the circumferential direction. 5 is opened. Further, the through holes 5 are formed at intervals along a spiral locus on the outer peripheral surface of the rotating body 2 as shown in FIG.

Further, as shown in FIG. 14, the cutting bit 9 is formed by integrally forming a flat base 8 on the base end side of the cutting bit 9 with the tip of the cylindrical portion sharpened in a chevron shape. As shown in FIG. 1, the tip is projected from the outer peripheral surface through the through hole 5 from the inside of the hollow portion 4. The distal end of the cutting bit 9 is provided so as to be located on a straight line along a taper 21 from the large diameter side to the small diameter side of the outer periphery of the rotating body 2.

Further, as shown in FIG. 3, the cutting bit presser frame 19 has a hollow frustoconical shape, and a vertical groove 23 is formed on the outer peripheral surface thereof in the vertical direction with the small diameter side down, and spaced apart in the circumferential direction. ing. That is, the vertical grooves 23 correspond to the through holes 5 that are opened in one row at intervals along the vertical direction of the rotating body 2 and in a plurality of rows at intervals in the circumferential direction. The pedestal 8 of the plurality of cutting bits 9 is inserted into the vertical groove 23. By inserting the cutting bit presser frame 19 into the hollow portion 4 of the truncated cone-shaped rotating body 2 from above, the pedestal 8 of the cutting bit 9 is supported from the back side as shown in FIG. keeping.

When the cutting bit 9 is attached in this way, the cutting bit 9 is projected at intervals along a plurality of spiral trajectories formed on the outer peripheral surface of the rotating body 2, and the tip of the cutting bit 9 is as shown in FIG. In addition, it is provided so as to be positioned on a straight line along the taper 21 from the large diameter side to the small diameter side of the outer periphery of the rotating body 2.

A flange 18 is attached to the upper portion of the rotating body 2 with a bolt 24 so as to hold the cutting bit presser frame 19, and a cylindrical shaft attaching portion 25 is formed at the center of the upper surface of the flange 18.

The grinder 1 having the above-described configuration is formed in a small and light weight in which the outer diameter of the upper flange 18 is, for example, 80 mm and the height of the rotating body 2 is, for example, 50 mm. The grinder 1 is attached to a small engine 28 attached to a holding frame 27 as shown in FIG. The holding frame 27 is formed with a rear holding portion 29 and an upper holding portion 29. A pulley 30A attached to the output shaft of the engine 28 and a pulley 30B attached to the front end side of the holding frame 27 are connected by a belt 31, and the pulley A reduction gear 32 composed of a bevel gear is connected to the shaft 30B. A hand chamfering machine 35 is formed by connecting the output shaft 33 of the speed reducer 32 to the shaft mounting portion 25 of the grinder 1.

The hand chamfering machine 35 having the above-described configuration grips and holds the grip portions 29 and 29 with both hands, cuts the side surface of the grinder 1 vertically with an asphalt cutter (not shown) in advance, and then vertically cuts the vertical cutting surface 15. When the hand chamfering machine 35 is moved by bringing the asphalt pavement surface 13 on one side into contact with the peeled vertical cutting surface 15 and the hand chamfering machine 35 is moved, a tapered polishing surface 15a is formed. That is, when polishing in a taper shape within a range of several meters in a small repair work, the small and light hand chamfering machine 35 is effective.

That is, the grinder 1 of this application inserts the base 8 of the some cutting bit 9 arrange | positioned linearly in the vertical direction in the vertical groove 23 formed in the up-down direction in the outer peripheral surface of the cutting bit holding frame 19, and is a base. 8 is supported from the back side, so that it is not necessary to process the hollow flat groove 20 for inserting and holding the base 8 as shown in FIG. By simply forming the vertical groove 23 on the outer peripheral surface of the frame 19, it is easy to process and can be manufactured at low cost.

For this reason, it has been difficult for the grinder 1 having the conventional structure to process the concave groove 20 into the cutting bit press frame 19 having a small inner diameter. However, in the present invention, since the vertical groove 23 is only formed on the outer peripheral surface, the size and weight can be reduced. As a result, the hand chamfering machine 35 capable of polishing while being held by hand is made possible.

Further, the outer peripheral surface of the rotating body 2 is formed in a longitudinal concave curved surface 3, and a plurality of cutting bits 9 are provided protruding at intervals in the circumferential direction, so that the tip of the cutting bit 9 is worn and shortened. Even if the outer peripheral surface of the rotating body 2 comes into contact with the vertical cutting surface 15, the outer peripheral surface of the rotating body 2 is prevented from being worn out, and the tip of the cutting bit 9 reliably contacts the vertical cutting surface 15 of the asphalt. it can.

Further, since the cutting bit 9 is detachably attached to the through hole 5 of the rotating body 2, the cutting bit 9 is worn and shortened, so that only the worn cutting bit 9 is replaced or the attachment position is rotated. In this case, since the flange 24 and the cutting bit presser frame 19 can be removed and only the cutting bit 9 can be replaced, it is extremely economical. In particular, since the cutting bit 9 disposed in the middle stage is heavily worn, the entire cutting bit 9 can be worn uniformly by exchanging with the upper and lower cutting bits 9.

Further, since the shaft mounting portion 25 of the asphalt chamfering grinder 1 and the rotating shaft of the engine 10 are connected via a speed reducer 32 using a bevel gear, the rotational force is increased and polishing can be performed efficiently and hand chamfering can be performed. The grinder 1 can be rotated in the horizontal direction with the machine 35 standing upright.

FIG. 5 shows another embodiment of the present invention, which is a disc in which a concavo-convex portion 39 is formed on the outer periphery as shown in FIG. 6 at the small-diameter end of the truncated conical rotating body 2 of the grinder 1. A cylindrical guide cutter 40 is attached horizontally.

The disk-shaped guide cutter 40 is integrally connected to the rotating body 2, and when the rotating body 2 is brought into contact with the vertical cutting surface 15 of the asphalt pavement surface 13 as shown in FIG. When the upper side is cut by the cutting bit 9 and the grinder 1 is further pressed, a tapered polishing surface 15a is formed almost entirely as shown in FIG. 7B. When the grinder 1 is further pressed, as shown in FIG. 7C, a disk-shaped guide cutter 40 having an uneven portion 39 formed on the outer periphery bites into the lower portion of the tapered polishing surface 15a to form a guide groove 41.

Thus, since the disk-shaped guide cutter 40 rotates horizontally, guide grooves 41 are sequentially formed along the lower portion of the tapered polishing surface 15a, and the guide cutter 40 is inserted in this state. Therefore, the tapered polishing surface 15a can be accurately polished without the grinder 1 swinging up and down.

FIG. 8 and FIG. 9 show another embodiment of the hand chamfering machine 35, in which a disk is attached to the bottom of the speed reducer 32 at the top of the shaft mounting part 25 of the grinder 1 to which the disk-shaped guide cutter 40 is mounted. 42 is attached. A cylindrical cover 44 formed of a rubber plate 43 is attached to the outer periphery of the disc 42 so as to surround the grinder 1.

As shown in FIG. 9, the cover 44 is formed of a half-cylindrical rubber plate 43 on the side opposite to the asphalt pavement surface 13, and the asphalt pavement surface 13 side is overlapped with a plurality of trapezoidal rubber plates 43 to form a half cylinder. It is formed in a shape and is attached on the asphalt pavement surface 13 so as to spread outward as indicated by a virtual line.

A guide plate 46 and casters 47 are attached to the bottom surface of the circular plate 42 inside the cylindrical cover 44, and an exhaust pipe 48 is further attached. Four casters 47 are attached to the lower part of the holding frame 27 in front of the engine 28.

A bracket 50 is attached to the side of the speed reducer 32 and is rotated about the pulley 30B as a rotation center. A bolt 52 projects from the belt cover 49, and the bolt 52 passes through a curved guide hole 51 formed in the bracket 50 and is tightened with a wing nut 53 to adjust the angle of the grinder 1, thereby 29 can be fixed at an easy-to-work angle.

As shown in FIG. 8, the hand chamfering machine 35 configured as described above grips and holds the grip portions 29 and 29 with both hands, applies the four casters 47 to the asphalt pavement surface 13, and grinders 1 inside the disc 42. The next caster 47 is applied to the road surface from which the asphalt pavement surface 13 is peeled off, and the guide plate 46 is applied to the vertical cut surface 15. In this state, the trapezoidal rubber plate 43 surrounding the grinder 1 is lifted in an overlapping state and spreads outward on the asphalt pavement surface 13 as indicated by a virtual line. It can be kept sealed. A dust collector hose (not shown) is connected to the exhaust pipe 48.

When the engine 28 is operated in this state and the gripping portion 29 is held by hand and the guide plate 46 is moved while being pressed against the vertical cut surface 15, the caster 47 runs smoothly. When polishing is performed in this state, as shown in FIG. 7C, the disk-shaped guide cutter 40 having the uneven portion 39 formed on the outer periphery bites into the lower portion of the tapered polishing surface 15a and sequentially guides the guide grooves 41. Since the process proceeds with the guide cutter 40 inserted therein while forming, the tapered polishing surface 15a can be accurately polished without the grinder 1 swinging up and down.

The grinder 1 has a sealed space surrounded by a rubber plate 43, and the generated dust is sucked into the external dust collector through the exhaust pipe 48, so that the work environment can be maintained well.

FIGS. 10 and 11 show another embodiment of the cutting bit 9, in which a cylindrical portion 55 is formed integrally with a base 8 and the cutting bit 9 is inserted into the through hole 5. Compared with the structure shown in FIG. 14, this can prevent breakage at the connecting portion between the base 8 and the cutting bit 9 and can further enhance the durability.

In the above description, the structure in which a plurality of cutting bits 9 are projected along a plurality of spiral trajectories formed on the outer peripheral surface of the rotating body 2 has been described. Any arrangement that is supported by the longitudinal grooves 23 can be selected. The cutting bit 9 and the pedestal 8 are not limited to the above structure, and other structures may be used. The longitudinal groove 23 may be any structure as long as the pedestal 8 does not rotate. Further, the cutting bit presser frame 19 can be reduced in weight if it has a hollow truncated cone shape, but it may also have a truncated cone shape.

In the above description, the grinder 1 is connected to the engine 28 via the speed reducer 32. However, the grinder 1 may be directly connected to the output shaft of the small engine 28. In this case, since a commercially available hand cutter can be removed and replaced with the grinder 1, a hand-held hand cutter can be used. The power is not limited to the small engine 28 but may be a motor. Furthermore, it is not limited to a small size that can be held by hand, and may be attached to the traveling device 11 as shown in FIG.

It is a longitudinal cross-sectional view which shows the grinder by one Embodiment of this invention. It is a horizontal sectional view which shows the grinder of FIG. It is a perspective view which shows the cutting bit press frame. It is a side view which shows the hand chamfering machine which attached the grinder of this invention. It is a front view of the grinder which attached the disk-shaped guide cutter by other embodiment of this invention. It is a top view of a disk-shaped guide cutter. It is explanatory drawing which shows the state which the disk-shaped guide cutter bites into a vertical cut surface, and forms the guide groove. It is sectional drawing which shows the hand chamfering machine which attached the cylindrical cover to the grinder by other embodiment of this invention. It is a principal part bottom view which shows the state which attached the cylindrical cover to the grinder of FIG. It is a perspective view which shows the cutting bit by other embodiment of this invention. It is sectional drawing which shows the cutting bit of FIG. It is a perspective view which shows the conventional grinder. It is a longitudinal cross-sectional view which shows the grinder of FIG. It is a perspective view showing a cutting bit, It is a side view which shows the state which grind | polished a vertical cut surface with the asphalt chamfering apparatus which attached the conventional grinder to the traveling apparatus.

1 grinder
2 Rotating body
3 Vertical concave curved surface
4 Hollow part
5 Through hole
8 pedestal
9 Cutting bit
10 engine
11 Traveling equipment
13 Asphalt pavement
15 Vertical cut surface
15a Tapered polished surface
16 Guide
18 Flange
19 Cutting bit presser frame
20 groove
21 Taper
23 Vertical groove
24 volts
25 Shaft mounting part
24 Holding frame
28 Small engine
29 Gripping part
30A, 30B pulley
31 belt
32 Reducer
33 Output shaft
35 Hand chamfering machine
39 Concavity and convexity
40 Guide cutter 40
41 Guide groove
42 disc
43 Rubber plate
44 Cylindrical cover
46 Guide plate
47 Caster
48 Exhaust pipe
49 Belt cover
50 Bracket
51 Guide hole
52 volts
53 Wing Nut
55 Cylindrical part

Claims (5)

  The small-diameter side of the rotating body having a hollow truncated cone shape is directed downward, the outer peripheral surface thereof is formed into a longitudinal concave curved surface, and a through-hole extending from the hollow portion inside the rotating body toward the outer peripheral surface is formed in the vertical direction of the rotating body. The through-holes are opened in one row at intervals along the direction and in a plurality of rows at intervals in the circumferential direction, and the tip side of the cutting bit provided with a pedestal extends from the inside of the hollow portion toward the outer periphery. A cutting bit presser frame having a truncated conical shape formed on a plurality of rows of outer peripheral surfaces at intervals in the circumferential direction with longitudinal grooves supporting the cutting bit pedestal from the back side. An asphalt chamfer grinder characterized by being detachably inserted inside the hollow portion.   2. The asphalt chamfering grinder according to claim 1, further comprising a disc-shaped guide cutter having an uneven portion formed on the outer periphery thereof horizontally attached to a small-diameter side end of the rotating body.   3. An asphalt chamfer grinder according to claim 2, wherein a flange is detachably joined with a bolt to the large diameter side of the rotary body having a hollow frustoconical shape, and the shaft is connected to the drive side rotary shaft. Asphalt chamfering grinder characterized by forming part.   A hand chamfering machine, wherein the shaft mounting portion of the asphalt chamfering grinder according to claim 3 is connected to a rotating shaft of an engine or a motor, and the engine or the motor is mounted on a holding frame held by a hand. 5. The hand chamfering machine according to claim 4, further comprising a disc attached to an upper portion of a shaft mounting portion of an asphalt chamfering grinder, and a cover formed of an elastic plate attached to the outer periphery so as to surround the grinder. Hand chamfering machine.