JP5777780B1 - Fixture and cutting device - Google Patents

Abstract

An object of the present invention is to provide a rotary blade fixing tool and a cutting device including the fixing tool, in which a defining portion that defines the cutting depth of a pavement surface by the rotary blade is not worn by rotation. A rotary blade 1 is attached to a rotary shaft 2 and is clamped and fixed to a presser disc 2a and a fixture 3. The fixture 3 includes a presser body 10, a bearing 20, and a cover 30. The presser body 10 includes an insertion portion 11 and a fitting portion 12. The bearing 20 is externally fitted to the fitting portion 12 joined to the insertion portion 11, and the cover 30 is externally fitted to the bearing 20. The cover 30 has a flange 30a, and the gauge disk 50 is detachably attached to the flange 30a. The gauge disk 50 functions as a defining part that defines the cutting depth. [Selection] Figure 1

Description

  The present invention relates to a fixture that fixes a rotary blade to a rotary shaft, and a cutting device that includes the fixture.

  At the repair site of roads that have been paved with concrete or asphalt, a cutting device that cuts the existing paved surface is used. This cutting device has a configuration in which a rotary blade having a disk shape is attached to a rotary shaft driven by an engine, and a blade provided on the outer periphery of the rotary blade is pressed against a pavement surface for cutting. The rotary blade can be raised and lowered, and the cutting depth of the pavement surface is adjusted by adjusting the descending amount of the rotary blade. This adjustment is generally performed manually by an operator. For example, in a repair site such as a bridge or an expressway, in order to prevent contact between the structure existing under the paved surface and the rotary blade. It is necessary to adjust the cutting depth accurately.

  Patent Document 1 describes a method that enables adjustment of a cutting depth in a cutting device including a rotary blade. This cutting device has a configuration in which a disc having a diameter smaller than that of the rotary blade is coaxially fixed to a tip portion of a rotary shaft protruding to one side of the rotary blade. When the rotary blade is lowered by a certain amount when the pavement surface is cut, the disk comes into contact with the pavement surface. Thereby, the cutting depth of the pavement surface by the rotary blade can be adjusted.

JP 2002-322897 A

  However, in the configuration described in Patent Document 1, since the disc is fixed to the rotation shaft, it rotates together with the rotation shaft. Therefore, when the road surface is cut to a predetermined depth and the disk contacts the road surface, there is a problem that the disk is worn by friction.

  The present invention has been made in view of such circumstances, and an object of the present invention is to fix a rotary blade in which a defining portion that defines the depth of cutting of the pavement surface by the rotary blade is not worn by rotation. It is providing a cutting device provided with a tool and this fixing tool.

  The fixture according to the present invention has a disc shape, includes an insertion portion having an insertion hole for inserting a rotation shaft at a central portion, and makes one surface of the insertion portion abut against a disc-shaped rotary blade, In the fixture for coaxially fixing the rotary blade to the rotary shaft, the fitting has a cylindrical shape, protrudes on the other surface of the insertion portion, a bearing externally fitted to the fitting portion, and a cylinder And a cover having a convex portion projecting radially outward on the rotary blade side, and having an annular shape, externally fitted to the cover and opposite to the rotary blade of the convex portion It is attached to the surface of the side, the outer peripheral part is located inside the outer periphery of the rotary blade, is located outside the convex part, and defines the depth of cutting by contacting the target surface of the cutting by the rotary blade And a section.

  According to the present invention, the bearing is fitted on the fitting portion protruding from the insertion portion, and the cover is fitted on the bearing. Further, the defining portion that defines the depth of cutting is attached to the convex portion of the cover. Accordingly, when the cutting device is activated and the rotation shaft is rotating, when the defining portion comes into contact with the cutting target surface, the defining portion does not rotate due to the frictional force caused by the contact between the defining portion and the cutting target surface. .

  The fixture according to the present invention is characterized in that the bearing is a rolling bearing.

  According to the present invention, since the bearing is a rolling bearing, it rotates smoothly.

  The fixture according to the present invention is characterized in that the convex portion is a flange.

  According to the present invention, since the convex portion is a flange, the contact area with the defining portion is increased, and the defining portion attached to the cover is stabilized.

  The fixture according to the present invention is characterized in that the defining portion is detachably attached to the convex portion.

  According to the present invention, since the defining portion can be attached to and detached from the convex portion of the cover, the defining portion having an arbitrary diameter can be attached to the cover.

  In the fixing device according to the present invention, the insertion portion has a plurality of holes penetrating around the insertion hole, is radial at the outer edge portion of the one surface, and is inclined at a predetermined angle with respect to the radial direction. A plurality of grooves are provided.

  According to the present invention, the insertion portion is provided with a plurality of holes around the insertion hole. Further, the insertion portion is provided with a plurality of grooves that are radial and inclined at a predetermined angle with respect to the radial direction at the outer edge portion of one surface. Therefore, the water supplied to the fixture passes through the plurality of holes of the insertion portion, flows out of the plurality of grooves, and flows to the rotary blade.

  The cutting device according to the present invention includes the above-described fixture.

  According to the present invention, since the cutting device includes the above-described fixture, the cutting target can be cut to a predetermined depth.

  When the road surface is cut to a certain depth with a rotary blade, and the prescribed part contacts the surface to be cut, the prescribed part does not rotate due to the frictional force between the prescribed part and the target surface to be cut. Wear due to friction can be prevented.

  Moreover, since the bearing is a rolling bearing, it can be rotated smoothly. By attaching the defining portion to the flange, the contact area between the convex portion and the defining portion increases, and the attachment of the defining portion can be stabilized. Since the defining portion can be attached to and detached from the cover, a defining portion having an arbitrary diameter can be selected and the depth at which the road surface is cut can be adjusted.

Furthermore, the water supplied to the fixture passes through the plurality of holes of the insertion portion, flows out of the plurality of grooves, and flows to the rotary blade. Thereby, the rotary blade which became high temperature by the friction at the time of a cutting | disconnection can be cooled.
A cutting apparatus provided with the above-described fixture can cut a cutting target to a predetermined depth.

It is a sectional side view which shows the principal part of the cutting device which concerns on embodiment. It is a front view of the fixing tool concerning an embodiment. It is a rear view of a presser body.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rotary blade fixture according to the present invention will be described in detail with reference to the drawings showing embodiments thereof. FIG. 1 is a side cross-sectional view showing a main part of a cutting device according to an embodiment. As shown in the figure, the cutting device includes a rotary blade 1, a rotary shaft 2 that rotationally drives the rotary blade 1, and a fixture 3 that fixes the rotary blade 1 to the rotary shaft 2.

  The rotary blade 1 has a thin disk shape, and includes a cutting blade formed on the entire outer periphery, and a shaft insertion hole 1a formed through the central portion. Further, the rotary blade 1 includes a through hole 1b in the vicinity of the shaft insertion hole 1a. The rotary shaft 2 is driven to rotate by a drive source (not shown) such as an engine equipped in the cutting device main body, and a presser disc 2a is provided at the tip of the rotary shaft 2. ing. Further, the rotary shaft 2 protrudes from the presser disc 2a, a small diameter portion 2b that can be fitted into the shaft insertion hole 1a of the rotary blade 1, and a screw shaft that is coaxial with the small diameter portion and has a screw formed on the outer periphery. 2c.

  The rotary blade 1 has a fixture 3 having a configuration to be described later overlaid on one surface, and is fitted around the small diameter portion 2b from the other surface side together with the fixture 3 through a shaft insertion hole 1a. Further, the rotary blade 1 is clamped and fixed between the fixture 3 and the holding disc 2a by screwing a nut 4 to a screw shaft 2c projecting outside the fixture 3 and tightening the nut 4. Yes.

  The relative rotation between the rotary blade 1 and the rotary shaft 2 is performed by, for example, a spline provided in a fitting portion between the former shaft insertion hole 1a and the latter small-diameter portion 2b, and the relative rotation between the rotary blade 1 and the fixture 3. Are respectively restrained by the positioning pins 2d protruding from the presser disc 2a, and the rotary blade 1 fixed as described above rotates on the same axis according to the rotation of the rotary shaft 2. The positioning pin 2d is inserted into the through hole 1b. Further, the rotary blade 1 can be moved up and down (moved in the radial direction) together with the rotary shaft 2 by the operation of an elevating mechanism (not shown) provided in the cutting apparatus main body.

  As shown in FIG. 1, the cutting device configured as described above is used to apply a cutting blade on the outer periphery of the rotating blade 1 to the pavement surface 5 to be cut and to cut the pavement surface 5 with the cutting blade. Is done. The cutting depth of the pavement surface 5 by the rotary blade 1 is adjusted by changing the descending amount of the rotary blade 1.

  The fixture 3 includes a presser body 10 that comes into contact with one surface of the rotary blade 1. The presser body 10 has a disc shape, and includes an insertion portion 11 into which the rotating shaft 2 is inserted, and a fitting portion 12 that has a cylindrical shape and protrudes with the same axial center on one surface of the insertion portion 11. Have.

  FIG. 2 is a front view of the fixture 3 according to the embodiment, and FIG. 3 is a rear view of the presser body 10. As shown in FIGS. 2 and 3, the insertion portion 11 is provided with an insertion hole 11 a penetrating in the axial direction at the center portion. The small diameter portion 2b and the screw shaft 2c are inserted into the insertion hole 11a. In addition, the presser body 11 is provided with eight through holes 11b around the insertion hole 11a at equal intervals in the circumferential direction on the inner side in the radial direction than the fitting portion 12. An annular recess 13 is provided on the back surface of the insertion portion 11 including the formation range of the hole 11b.

  Furthermore, a single hole 11c that penetrates the insertion portion 11 in the axial direction is provided in the recess 13 on the radially inner side of the through hole 11b. The positioning pin 2d is inserted into the hole 11c.

  Sixteen grooves 14 are formed in the outer edge portion that borders the outer side of the concave portion 13 of the insertion portion 11. Eight of the grooves 14 are clockwise when viewed from the back with respect to an imaginary line connecting the center point of the insertion portion 11 and the center point of any one of the eight through holes 11b. Are provided along an imaginary line passing through the center point of each of the arbitrary holes. Furthermore, the remaining eight are provided at equal intervals between the eight grooves so as to form an angle of 45 degrees with respect to the radial direction. The groove 14 forms a water passage between the rotary blade 1 and the rotary blade 1 when the rotary blade 1 is fixed to the rotary shaft 2 by the fixture 3.

  The through-hole 11b and the groove 14 supply water for cooling the rotary blade 1 that has become hot due to friction during cutting. Water is supplied from the front of the fixture 3, passes through the through hole 11 b, accumulates in a portion surrounded by the recess 13 and the rotary blade, and is sent to the rotary blade 1 through the water passage by centrifugal force. Therefore, the through-hole 11b and the groove 14 can efficiently flow water to the rotary blade 1 and cool the rotary blade 1.

  The fixture 3 includes a bearing 20 that is externally fitted to the fitting portion 12. The bearing 20 is a rolling bearing formed by interposing a rolling element 23 on an outer ring 21 and an inner ring 22. The bearing 20 includes seal portions 24 on both sides of the rolling element 23. Grease is enclosed in a region surrounded by the outer ring 21, the inner ring 22, and the seal portion 24. The seal portion 24 prevents the grease for rotation of the rolling element 23 from leaking outside.

  A concave groove 12 a is provided around the outer periphery on the front side of the fitting portion 12. The shaft retaining ring 12b is externally fitted into the concave groove 12a. The inner ring 22 of the bearing 20 is sandwiched between the shaft retaining ring 12 b and the front surface of the insertion portion 11.

  The fixture 3 includes a cover 30 and a bearing holding plate 40. The cover 30 has a cylindrical shape and is fitted on the bearing 20. The cover 30 is provided with a flange 30a projecting radially outward on the back side, and is provided with a convex portion 30b projecting radially inward on the front side. In the flange 30a, four screw holes and four screw insertion holes penetrating in the axial direction are provided alternately at equal intervals in the circumferential direction.

  The bearing holding plate 40 has four screw holes that penetrate in the axial direction and are equally spaced in the circumferential direction. The bearing holding plate 40 is attached by bolts 40a passing through the four screw insertion holes of the flange 30a and screwing into the four screw holes of the bearing holding plate 40, respectively.

  The bearing holding plate 40 has an annular shape, and the inner diameter of the bearing holding plate 40 is smaller than the inner diameter of the cover 30. The bearing holding plate 40 is attached to the back surface of the flange 30a so that the outer circumferences of the flange 30a and the bearing holding plate 40 are aligned. Therefore, the convex portion 40 b is formed by the difference in inner diameter between the cover 30 and the bearing holding plate 40. The outer ring 21 of the bearing 20 is sandwiched between the convex portions 30b and 40b.

  The fixture 3 includes an annular gauge disk 50. The gauge disk 50 functions as a defining part that defines the cutting depth. The gauge disk 50 penetrates in the axial direction, is provided with four screw insertion holes at equal intervals in the circumferential direction, and has four concave portions 51 provided from the inner circumference toward the radially outer side at equal intervals.

  The gauge disk 50 is fitted on the cylindrical portion of the cover 30, and the bolt 50a passes through each of the four screw insertion holes of the gauge disk 50 and is screwed into each of the screw holes of the flange 30a. It is done. The gauge disk 50 is attached to the cover 30 so that the bolt 40a is positioned in the recess 51.

  The outer peripheral portion of the gauge disk 50 is positioned on the radially outer side than the outer periphery of the flange 30 a and is positioned on the radially inner side of the outer periphery of the rotary blade 2. The gauge disk 50 can be attached to and detached from the flange 30a.

  Hereinafter, the operation of the cutting apparatus according to the present embodiment will be described. As the rotary shaft 2 rotates, the rotary blade 1 and the fixture 3 rotate. The rotation direction is clockwise as seen from the front as shown by the arrows in FIGS. By the lifting mechanism, the rotary blade 1 is lowered, and the paved surface is cut by contacting the outer peripheral cutting blade.

  Further, as described above, water is supplied from the front surface of the fixture 3, passes through the through hole 11b, accumulates in a portion surrounded by the recess 13 and the rotary blade, and is sent to the rotary blade 1 through the water passage by centrifugal force. It is done. Therefore, water can be efficiently flowed to the rotary blade 2 and the rotary blade 2 can be cooled.

  When the rotary blade 1 is lowered by a certain amount and the road surface is cut to a predetermined depth by the rotary blade 1, the gauge disk 50 comes into contact with the road surface. In this case, the gauge disk 50 does not rotate due to frictional force due to contact with the pavement surface 5.

  In the above configuration, the bearing 20 is externally fitted to the fitting portion 12 protruding from the insertion portion 11, and the cover 30 is externally fitted to the bearing 20. The gauge disk 50 is attached to the flange 30 a of the cover 30. When the pavement surface 5 is cut to a certain depth by the rotary blade 2 and the gauge disk 50 comes into contact with the pavement surface 5, the gauge disk 50 does not rotate due to the frictional force between the gauge disk 50 and the pavement surface 5. Wear due to friction between the disk 50 and the pavement surface 5 can be prevented.

  In addition, when the gauge disk 50 is in contact with the pavement surface 5, the operator knows that the pavement surface 5 has been cut to a predetermined depth. Therefore, the pavement surface 5 can be cut to a predetermined depth by a cutting device using the fixture 3.

  Since the bearing 20 is a rolling bearing, it rotates smoothly. The flange 30a has a large contact area with the gauge disk 50, and the attachment of the gauge disk 50 is stable. As long as the gauge disk 50 can be fixed, the cover 30 may have a plurality of convex portions protruding radially outward instead of the flange 30a, and the gauge disk 50 may be attached to the convex portion.

Since the gauge disk 50 can be attached to and detached from the flange 30 a of the cover 30, the gauge disk 50 having an arbitrary diameter can be attached to the cover 30. Thereby, the pavement surface 5 can be cut to an arbitrary depth.
The insertion portion 12 is provided with a through hole 11b around the insertion hole 11a. The insertion portion 12 is provided with a groove 14 at the outer edge portion on the back surface. Therefore, the water supplied to the fixture 3 passes through the through hole 11 b, flows out of the groove 14, and flows to the rotary blade 1. Thereby, the rotary blade 1 which became high temperature by the friction at the time of a cutting | disconnection can be cooled.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Rotating blade 2 Rotating shaft 3 Fixing tool 11 Insertion part 11a Insertion hole 11b Through-hole 12 Fitting part 14 Groove 20 Bearing 30 Cover 30a Flange 50 Gauge disk

Claims (6)

It has a disc shape and is provided with an insertion portion having an insertion hole for inserting a rotation shaft in the center portion. One surface of the insertion portion is brought into contact with the disc-shaped rotation blade so that the rotation blade is coaxial with the rotation shaft. In the fixing device to fix
A cylindrical shape, and a fitting portion protruding from the other surface of the insertion portion;
A bearing externally fitted to the fitting portion;
A cover that has a cylindrical shape, is externally fitted to the bearing, and protrudes radially outward on the rotary blade side;
It has an annular shape, is externally fitted to the cover, is attached to the surface of the convex portion opposite to the rotary blade, and the outer peripheral portion is located on the inner side of the outer periphery of the rotary blade and on the outer side of the convex portion, And a defining part that regulates a cutting depth by contacting a surface to be cut by the rotary blade.   The fixture according to claim 1, wherein the bearing is a rolling bearing.   The said convex part is a flange, The fixing tool of Claim 1 or 2 characterized by the above-mentioned.   The said prescription | regulation part is attached to the said convex part so that attachment or detachment is possible, The fixing tool as described in any one of Claim 1 to 3 characterized by the above-mentioned.   The insertion portion has a plurality of holes penetrating around the insertion hole, and is provided with a plurality of grooves that are radial and inclined at a predetermined angle with respect to the radial direction at the outer edge portion of the one surface. The fixing device according to any one of claims 1 to 4, characterized in that:   A cutting device comprising the fixture according to any one of claims 1 to 5.

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