JPH081655A - Blade cover in cutting device for concrete or the like - Google Patents

Abstract

PURPOSE:To obtain a blade cover in a cutting device for concrete or the like, that has the small number of component parts and a light weight and prevents reduction of a sucking force of a vacuum device caused by the presence of a clearance between a shaft relief part and a rotating shaft. CONSTITUTION:In a blade cover 2, a lower frame 20 is integrally formed with a cover body 25 located upward of the lower frame 20, and shaft relief parts 24, 29 avoiding interference of a blade B with a rotating shaft 12 and permitting the positional shift of the blade B relative to the blade cover 2 are formed in a part of the lower frame 20 and the cover body 25 on the side opposed to a body frame 10.

Description

Detailed Description of the Invention

[0001]

[Object of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade protecting cover provided in a cutting device for cutting a road surface, such as concrete or asphalt.

[0002]

BACKGROUND OF THE INVENTION When cutting a road surface once paved with concrete, asphalt or the like by a waterworks or gas work that occurs after that, a cutting device having a disk-shaped blade called a blade is used. As the cutting device, in addition to the blade, a carriage-shaped main body frame having traveling wheels at the bottom is mounted with a prime mover that is a drive source of the blade, and an operation handle is provided on the upper portion of the main body frame. There is a manual traveling type cutting device which holds the operation handle in its hand to perform work.

[0003] Further improvement of this product and improvement in workability include a self-propelled device in which power is transmitted to the traveling wheels, and a vacuum device is mounted to suck chips and sludge. There is a cutting device. In addition, such a cutting device is provided with a blade cover 2'which protects the blade B and prevents the operator from touching the blade B rotating at high speed during processing.

The structure of a conventional blade cover is, as shown in FIG. 11, a cover body 25 'for covering substantially the upper half of the blade B, and this cover body 25' for the body frame 1.
A fixing bracket 80 fixed to 0 ', a lower frame 20' provided below the cover body 25 'and provided around the blade B in the horizontal cross-sectional direction, the cover body 25' and the lower frame 20 '. And a bellows 81 having a bellows shape for connecting the main body 10 'and the main body frame 10'.
Receiving metal fitting 2 that fits outside the restriction plate 13 'provided on the
8'is provided.

When the blade cover 2'is attached to the cutting device 1 ', the blade B is firstly attached.
Of the lower frame 2 between the blade B and the road surface below the blade B.
Position 0 '. Next, the bellows 81 provided on the upper surface of the lower frame 20 'is fixed to the main body frame 10' by bolting via the fixing bracket 80.
Then, the receiving metal fitting 28 'is fitted into the regulation plate 13' while covering the blade B with the cover body 25 'from above.
Finally, the cover body 25 'is attached to the fixing bracket 8
Fixing to 0 completes the attachment of the blade cover 2 '.

Incidentally, in this way, the blade cover 2 '
When the attached cutting device 1'is attached to an uneven road surface or an inclined road surface, the relative position between the cover body 25 'and the blade B does not change structurally, but the bellows 81 changes to the shape of the road surface. By appropriately expanding and contracting,
The lower frame 20 'is always positioned along the road surface, thereby preventing the suction force of the vacuum device (not shown) from decreasing.

However, when such a structure is adopted,
The number of parts increases, which leads to an increase in the weight of the entire blade cover 2'and an increase in the weight of the cutting device 1 '. Further, since such a blade cover 2'is composed of a large number of parts as described above and is constructed by appropriately assembling these parts, the efficiency of the work of attaching and detaching the blade cover 2'when replacing the blade B or the like is improved. It was markedly low. Further, in the above-mentioned blade cover 2 ', a shaft relief portion 24' is structurally required so as to avoid interference with the rotating shaft 12 'of the blade B and enable the cover body 25' to be attached and detached from above. However, a gap is inevitably formed between the shaft escape portion 24 'and the rotary shaft 12', and the presence of this gap causes a reduction in the suction force of the vacuum device.

[0008]

[Technical Items Attempted to Develop] The present invention has been devised on the basis of the recognition of such a background, and by reducing the number of parts, the weight is reduced and the workability is improved. The suction force of the vacuum device is reduced by adopting another follow-up mechanism of the lower frame that responds to undulations and irregularities of the work surface instead of the above, and a mechanism that closes the gap created between the shaft relief and the rotary shaft. This is an attempt to develop a blade cover for a new cutting device for concrete or the like, which is intended to prevent the above.

[0009]

Configuration of the Invention

[Means for Achieving the Object] That is, the blade cover in the cutting device for concrete or the like according to claim 1 is provided with a blade which directly acts on a work piece under the main body frame and cuts it, and a cutting device including this blade. In a cutting device for concrete or the like, which is provided with a traveling mechanism for moving in the traveling direction or for assisting in moving, and further, at least the prime mover serving as a drive source for the blades and the like is mounted on the main body frame. The blade protection member is located above the surface to be machined with a certain gap, and surrounds the periphery of the blade in the horizontal cross-section direction. And a cover main body provided on the main body frame side of the lower frame and the cover main body. To avoid interference with the de of the rotating shaft, it is intended that comprised a wherein the shaft relief portion that allows changes in the relative position between the blade and the blade cover is formed.

In addition to the above requirements, the blade cover in the cutting device for concrete or the like according to claim 2 is provided with a regulation provided on the side plate on the main body frame side of the cover main body at the side edge portion of the main body frame facing the side plate. A receiving metal fitting that accepts the entry of the plate and is loosely fitted to the outside is provided, and an engaging rod is provided at an end portion of the lower frame on the rear side in the traveling direction, and a rotating shaft portion of the engaging rod is provided. The blade cover is adapted to be engaged with an engagement hook provided to the main body frame, and the blade cover can be rotated around a range of a certain angle about the rotation shaft portion. .

In addition to the above requirements, the blade cover in the cutting device for concrete or the like according to claim 3 further comprises:
Between the blade cover and the main body frame, a closing shutter that receives suction by the vacuum device and closes the shaft escape portion is provided.

Further, in the blade cover of the cutting device for concrete or the like according to claim 4, in addition to the requirements of claim 3, the closing shutter engages with engagement pins provided on both side surfaces of the regulation plate. And an avoidance hole having a diameter slightly larger than the rotation axis of the blade at the lower part, and at least around the avoidance hole covering at least the shaft escape portion. It is characterized in that a surface is formed.
The above objects are intended to be achieved by these inventions.

[0013]

The blade cover in the cutting device for concrete or the like according to claim 1 comprises the lower frame and the cover body integrally provided with the lower frame, and the lower frame and the body frame of the cover body. A shaft escape portion is formed in a part of the side to avoid interference with the rotation axis of the blade and allow a change in relative position between the blade and the blade cover. This makes it possible to attach / detach to / from the body frame as a unit without separating the cover body and the lower frame, improving workability.
The presence of the shaft escape portion prevents interference with the rotating shaft of the blade, and can cope with changes in the relative position between the blade and the blade cover.

The blade cover in the concrete cutting device according to the second aspect is provided with a receiving metal fitting on the side surface of the cover body on the side of the main body frame, which is loosely fitted to the restriction plate provided on the main body frame, and advances in the lower frame. An engagement rod having a rotating shaft portion is provided on the rear side in the direction. Thus, when attaching the blade cover, cover the blade cover from above so that the regulation plate fits into the receiving metal fitting, and engage the engaging rod with the engaging hook provided on the main body frame. It is completed by just installing it, and the workability is remarkably improved. By loosely fitting the regulation plate and the receiving metal fitting, it is possible to rotate the blade cover around the rotation axis part within a certain angle range. To

The blade cover in the cutting device for concrete or the like according to the third aspect has a structure in which a closing shutter for closing the shaft escape portion is provided between the blade cover and the main body frame by receiving suction by the vacuum device. As a result, when the vacuum device is not driven, the blade cover is not restricted by the closing shutter and can be easily attached / detached.When the vacuum device is driven, the shaft escape portion is closed by the closing shutter. There is no decrease in power. Furthermore, since the drive mechanism for the closing shutter is not required, the weight is not increased.

In the blade cover of the cutting device for concrete or the like according to claim 4, the closing shutter is provided with an engaging long hole in the upper part and an avoiding hole in the lower part, and at least the shaft escape portion is covered around the avoiding hole. The surface is formed. As a result, the closing shutter can be moved to the cover body side along the rotation axis of the blade by the suction force of the vacuum device, the shaft escape portion is completely closed by the closing surface, and the suction force of the vacuum device is generated. Is prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A blade cover in a concrete cutting device of the present invention will be specifically described below with reference to the drawings. In the following description, a cutting device for cutting road surface paved with concrete or asphalt as a cutting device for concrete to which the blade cover of the present invention is applied will be described as an example, and the configuration of the entire cutting device will be described. Now, the configuration of the blade cover of the present invention will be touched upon.

In FIG. 1, reference numeral 1 is a cutting device to which the blade cover 2 of the present invention is applied. For example, this device assembles a metal square pipe, an angle member or the like into an appropriate frame shape. The main body frame 1 which is formed by the above-mentioned structure and acts as a supporting member for various members described below
It is equipped with 0. That is, the main body frame 10 is directly processed by a workpiece W (a paved road surface in the present embodiment. In the present specification, a paved road surface is a layer of paved concrete or asphalt having a certain thickness. A disk-shaped blade B for cutting the workpiece W is attached. Specifically, the shaft holder 11 is provided on the lower surface in the forward direction of the main body frame 10 (the direction in which the workpiece W is cut by the blade B), and the rotary shaft 12 is fitted into the shaft holder 11 internally. The blade B is attached to one end of the rotary shaft 12.

Further, below the main body frame 10, the main body frame 10 on which the above-mentioned members and the members described below are mounted.
A traveling mechanism 3 for moving forward and backward is provided. In this embodiment, the traveling drive wheel 30 and the auxiliary wheel 31 constitute the traveling mechanism 3, of which the traveling drive wheel 30 is arranged rearward of the main body frame 10 in the traveling direction, and the power from the prime mover 5 is transmitted to the transmission 32. It is configured to be transmitted and driven via. On the other hand, the auxiliary wheel 31 is not driven and is disposed near the middle of the blade B and the traveling drive wheel 30, and the auxiliary wheel 31 always contacts the surface A to be processed regardless of the undulations and the shape of the surface A to be processed. The urging arm 33 is constantly urged toward the surface A to be processed so as to come into contact with and rotate freely. In addition, the traveling mechanism 3 may be composed of only non-driving traveling wheels. In this case, the operator holds the operation handle 70 in his hand and presses the operation handle 70 to perform the cutting process, which is the manually-operated cutting device 1. In addition, the prime mover 5
In addition to an engine that is an internal combustion engine, the term includes other driving means such as an electric motor and a hydraulic motor.

In addition, a regulating plate 13 and an engaging hook 14 which serve as an engaging member for the blade cover 2 of the present invention, which will be described later, are provided on the lower portion of the main body frame 10, and the main frame 10 has a blade of the present invention. Air, water in the cover 2,
A vacuum device 4 for sucking mud or chips generated by cutting, a prime mover 5 as a drive source for the blades B, and a gauge 6 for guiding the blades B during cutting work are mounted.

The structure of the main one of these members will be described in more detail below. First, a description will be given of the blade cover 2 of the present invention which protects the blade B and prevents the operator from touching the blade B during processing.
The blade cover 2 of the present invention is located above the surface A to be processed with a certain gap therebetween, and is provided on the lower frame 20 around the blade B in the horizontal cross-sectional direction, and the lower frame 20 is provided with the lower frame 20. It basically comprises a cover body 25 integrally provided on the upper side.

The lower frame 20 is, for example, formed by connecting metal rectangular pipes in a plane rectangular shape, and the upper surface of the lower frame 20 has a connecting conduit 45 from a vacuum device 4 described later. And a suction port 20b for sucking air, water, mud, etc. sucked by the vacuum device 4 are provided on the bottom surface of the lower frame 20. Further, on the lower outer peripheral edge of the lower frame 20,
A brush 21 is provided so that the airtightness inside the blade cover 2 is maintained.

Further, handles 22 are provided on the front and rear edges of the lower frame 20 in the traveling direction, and the blade cover 2 of the present invention is attached and detached by the handles 22. In addition to the above, the lower frame 20 is provided with an engaging rod 23 on the rear side in the traveling direction. The engagement rod 23 is, for example, two T-shaped rods connected to be orthogonal to each other and formed into a T-shape in a plane. Of these, the rotating shaft portion 23a is located in the width direction of the cutting device 1, engages with the above-described engaging hook 14 provided on the main body frame 10, and the rotating shaft portion 23a is the center. The blade cover 2 of the present invention is configured to be rotatable over a range of a certain angle.

The cover body 25 provided above the lower frame 20 has two semicircular side plates 26 arranged so as to face each other, and only the arc-shaped peripheral edge thereof is formed into the arc. Rectangular body plate 2 that is curved together
The blade B is closed by 7, and is provided so as to cover substantially the upper half of the blade B. On the side plate 26 of the cover main body 25 on the main body frame 10 side, a receiving metal fitting 28 that receives the entry of the regulation plate 13 and is loosely fitted to the outside is provided.

That is, a rectangular flat plate-like regulation plate 13 is erected upward as an example at the end portion of the body frame 10 facing the cover body 25, and the blade cover 2 of the present invention is attached to the blade B. In the mounted state,
The receiving metal fitting 28 is set in a positional relationship so as to hold the upper end portion of the regulation plate 13 in the vicinity thereof. Further, the fitting of the restriction plate 13 and the receiving metal fitting 28 is set to be considerably loose as can be seen in FIGS. 1, 4 and 5, but this is because the blade cover 2 is different depending on the undulation of the work surface A and the size of the inclination. Rotating shaft 23
This is because the blade cover 2 can be rotated about a within a fixed angle range and the blade cover 2 can be easily attached to the blade B.

Further, the regulating plate 13 is provided with a locking pin 13a, which abuts the lower surface of the receiving metal fitting 28 to set the lower limit position of the blade cover 2. Furthermore, in the blade cover 2 of the present invention, as shown in FIGS. 1, 4 and 5, a part of the lower frame 20 and the cover main body 25 on the main body frame 10 side is cut out, and this is the rotary shaft 12 of the blade B. Avoid interference with
The shaft escape portions 24 and 29 allow a change in the relative position between the blade B and the blade cover 2.

Further, between the blade cover 2 and the main body frame 10, there is provided a closing shutter 15 for closing the shaft escape portions 24 and 29 by receiving suction by a vacuum device 4 which will be described later. This closing shutter 15 is shown in FIG.
In 4 and 5, for example, a rectangular shape is formed, and both side edges of the upper part are bent by 90 ° to form the ear part 16. Further, as shown in FIGS.
Is engraved, and the restriction plate 13 is provided in the engagement elongated hole 17.
The engaging pins 13b provided on both side surfaces of are engaged with each other.

Incidentally, the engagement elongated hole 17 allows the movement of the blade B of the closing shutter 15 along the rotary shaft 12, and in FIGS.
In order to promote the movement of the cover main body 25 toward the cover main body 25 side, the engaging elongated hole 17 is inclined so that the cover main body 25 side is slightly lowered.

Furthermore, an avoidance hole 18 for receiving the rotary shaft 12 of the blade B and avoiding interference between the two is provided below the closing shutter 15. The avoiding hole 18 is set to have a diameter slightly larger than the shaft diameter of the rotating shaft 12 of the blade B so that the closing shutter 15 can smoothly move along the rotating shaft 12 of the blade B. By the way, this avoiding hole 18
If the diameter of the blade is made larger than necessary, the airtightness inside the blade cover 2 will be impaired, and the suction force of the vacuum device 4 will be reduced.

Further, according to the present invention, the obstruction surface 19 around the avoidance hole 18 can cover at least the shaft escape portion 29 of the cover body 25.
Is formed. 1, 4, 5
In the present embodiment shown in FIG. 2, all the surfaces of the closing shutter 15 except the ears 16 on the blade cover 2 side are the closing surfaces 19.
Has become.

Hereinafter, such a blade cover 2 of the present invention will be described.
The procedure of the attachment / detachment work and the operating state of the closing shutter 15 when the vacuum device 4 is driven and not driven will be described. First, when the blade cover 2 is attached to the blade B, the handle 22 of the blade cover 2 in which the lower frame 20 and the cover body 25 are integrated is held, and the blade B is covered from above. At this time, in the present invention, it suffices to insert the regulation plate 13 into the receiving metal fitting 28 and align the rotation shaft portion 23a of the engagement rod 23 with the engagement hook 14.
Work such as bolt tightening that has been performed conventionally is not required.

The blade cover 2 attached in this manner rotates about the rotation shaft portion 23a over a range of a certain angle, and responds to the ups and downs and the inclination of the work surface A, The brush 21 provided under the lower frame 20 is always grounded to the surface A to be processed.

When the vacuum device 4 is driven in such a state, the inside of the blade cover 2 of the present invention is decompressed, and the closing shutter 1 originally located on the body frame 10 side.
5 gradually moves along the rotation axis 12 of the blade B, and finally, the lower frame 20 and the cover main body 25.
In close contact with the side plate 26, the shaft escape portions 24 and 29 are closed. Further, when removing the blade cover 2, it is sufficient to hold the handle 22 and pull up the blade cover 2 upward while releasing the engagement of the engagement rod 23 with the engagement hook 14 as in the case of the attachment.

Next, the traveling operation mechanism 3A provided for the purpose of ensuring stable traveling and reliable stop when the traveling mechanism 3 is of a drive type will be described. Travel operation mechanism 3
A serves to increase the certainty of holding the control shaft 34 in each of the forward, backward, and backward positions of the transmission 32, and an operating lever 35 provided at the upper rear part in the traveling direction of the cutting device 1. , The rotary shaft 35 of the operating lever 35
a lever position holding mechanism 36, a lock bar 37 provided at the tip of the rotating shaft 35a, a lever return prevention mechanism 38 connected to the tip of the lock bar 37, and a lever return prevention mechanism. One end is connected to 38, one end is connected to the connecting rod 39 whose one end is connected to the other lever return prevention mechanism 38 and the other lever return prevention mechanism 38, and the other end is connected to the control shaft 34. It is provided with another connecting rod 39.

Some of these members will be described in more detail below. First, the lever position holding mechanism 36 is shown in FIG.
As shown in (b), two fitting holes 36b for receiving the rotating shaft 35a of the operating lever 35 are formed in the inverted U-shaped holding bracket 36a in a penetrating state, and the rotating shaft 35a is The rotating shaft 35a in the inserted state
With respect to the fitting hole 36b located on the front end side (the side opposite to the side on which the operation lever 35 is attached), the engaging groove 36c having a depth that allows at least a part of the lock bar 37 to be engaged with the fitting hole 36b. Is formed over the entire width of the holding bracket 36a.

Further, in the inner space of the holding bracket 36a, there is provided a cylindrical spring holder 36d which is fitted onto the rotating shaft 35a and is attached to the rotating shaft 35a by a set screw or the like. The rotary shaft 35a is provided in the gap between the inner peripheral surface of the spring holder 36d and the rotary shaft 35a on the operation lever 35 side, that is, the lock bar 37.
Is arranged so that a part of the urging spring S1 for urging the member in the direction of engaging with the engaging groove 36c is included.

Furthermore, a stopper 36e for setting the turning angle of the lock bar 37 is provided on the outer surface of the holding bracket 36a in which the engaging groove 36c is formed. Incidentally, the stopper 36e determines the forward movement position and the backward movement position of the traveling mechanism 3 as shown in FIG. 7B, and the engagement groove 36c determines the stop position of the traveling mechanism 3 and
It serves to hold the stop position.

Next, the lever return prevention mechanism 38 will be described. As shown in FIG. 6, the lever return prevention mechanism 38 is provided with a friction disc 38b between outer discs 38a attached to the tips of the lock bars 37 or the connecting rods 39, and further the outer discs 38a and the friction discs 38a. A bolt 38c, which serves as a rotating shaft, is provided in the center of 38b in a penetrating state, and the friction disc 38b and the outer disc 38a are closely attached between the head of the bolt 38c and one outer disc 38a. A pressing spring S2 that increases the force is provided. In the embodiment shown in FIG. 6, a flat spring is used as the pressing spring S2.

Next, the operating state of the traveling operation mechanism 3A constructed as described above will be described. First, the case where the operation lever 35 is in the stop position in the starting state will be described. In this case, the lock bar 37 is engaged with the engagement groove 36c as shown by the solid line in FIG.
The control shaft 34 in 2 is securely held in the stop position. Then, in order to switch the control shaft 34 from such a state to the forward position or the backward position, the operation lever 35 is held in hand and the rotary shaft 35a is pushed in the direction in which the biasing spring S1 is compressed, and the tip of the rotary shaft 35a is pushed. The engagement between the lock bar 37 and the engagement groove 36c provided on the is released.

Next, the operation lever 35 is rotated until it reaches the forward movement position or the backward movement position. The forward and backward positions are determined by the lock bar 37 coming into contact with the stopper 36e, so that no strict position adjustment is required.
Further, at this time, the lever return preventing mechanism 38 operates, and the control shaft 34 is moved to the forward or backward position by the pressing force of the pressing spring S2 and the frictional force between the outer disk 38a and the friction disk 38b accompanying this. Since it is held, variation in the speed of the traveling mechanism 3 due to the fine movement of the control shaft 34 does not occur.

In addition, the reference numeral T in FIG. 2 is a torque limiter, and the transmission 32 is connected to the prime mover 5 via a V-belt or the like as shown in FIG. The torque limiter T is provided because it is expected that the output of the prime mover 5 will exceed the allowable input of the transmission 32 and damage the transmission 32 when a large resistance is applied to the transmission 30. Further, in FIG. 2, reference numeral F indicates a cooling fan for cooling the transmission 32.

Next, the vacuum device 4 will be described.
The vacuum device 4 includes a vacuum unit 40 including a discharge pump 41 and a suction blower 42 in an appropriate housing H, and suctioned air, water, mud, chips, etc., as air A _i , liquid L _i, and solid S. Vacuum tank 43 divided into _o and
And a communication conduit 45 provided between the vacuum unit 40 and the vacuum tank 43, and between the vacuum tank 43 and the blade cover 2 of the present invention.

The vacuum device 4 as described above is driven by a drive transmission mechanism 46 as described below.
That is, the power of the prime mover 5, which is a drive source, is output to the outside by the output pulley 50 attached to the main shaft of the prime mover 5, and the output pulley 50 and the intermediate shaft pulley 47 provided for the housing H of the vacuum unit 40. , Transmission belt B _V between reduction gear pulley 48
The power is transmitted to the vacuum device 4 by winding the.

The power transmitted to the intermediate shaft pulley 47 is further transmitted between the driven pulley 47a and the blower drive pulley 49 provided on the same shaft, and is transmitted to the transmission flat belt B.
It is also transmitted to the suction blower 42 by _F. Further, the power transmitted to the speed reducer pulley 48 is reduced by a speed reducer (not shown) and is also transmitted to the discharge pump 41 connected to the output shaft of the speed reducer, which constitutes the drive transmission mechanism 46. Is there. In addition, in FIG.
Shown at _T is transmission belt B _V or transmission flat belt B
_This is a tension pulley for _F tension adjustment.

Further, the connecting pipe 45 is provided in the lower frame 2
0, the suction pipe line 45a connecting the connection port 20a and the vacuum tank 43, the exhaust pipe line 45b connecting the vacuum tank 43 and the suction blower 42, and the vacuum tank 4
3 and is constituted by a drainage conduit 45c connecting the discharge pump 41, the dust collecting basket 44 of solids S _o for recovery is provided in the vacuum tank 43.

Next, the vacuum device 4 thus constructed
The operating state of will be described. First, when the prime mover 5 is started, the power transmitted to the reduction gear pulley 48 via the transmission belt B _V is transmitted to the discharge pump 41 in a state of being reduced by a reduction gear (not shown) so that the discharge pump 41 is driven. Become. Further, the power transmitted to the intermediate shaft pulley 47 is transmitted to the blower drive pulley 49 via the driven pulley 47a and the transmission flat belt B _F to drive the suction blower 42.

Thus, the drainage line 45c and the exhaust line 4
5b through vacuum tank 43 through suction line 45a
A suction force is generated in the communication pipe line 45 connected to, and sucks air, water, mud, cutting chips and the like in the blade cover 2 of the present invention, and reaches the vacuum tank 43. Further, these are the air A _i and the liquid component L in the vacuum tank 43.
_The air A _i is categorized into _i and the solid content S _o, and the air A _i is sent to the suction blower 42 via the exhaust pipe line 45 b and exhausted from the exhaust port 42 a toward the lower side of the cutting device 1.

The liquid component L _i is sent to the discharge pump 41 via the drainage pipe 45c and is discharged to the outside as fresh water or is stored and recovered in a separate recovery tank (not shown). Further, the solid content S _o is collected by the water-permeable dust collecting basket 44, the upper lid of the vacuum tank 43 is opened, and the dust collecting basket 44 is taken out and discarded.

By the way, if such a structure is adopted, the structure of the vacuum device 4 can be simplified, the assembly work can be facilitated, the device can be made smaller and lighter, and the transmission flat belt B _F can be dropped or damaged. Further, the discharge pump 41 and the suction blower 42 are synchronized with each other, and the ability balance between the two can be obtained.

Next, the gauge 6 and the lift drive mechanism 60 for the gauge 6 will be described. The gauge 6 is a processing guide member that enables the blade B to cut the paved road surface as the workpiece W along the cutting guide line (not shown) marked on the surface A to be processed as described above. The structure is such that a strip-shaped gauge piece 6a whose tip is cut obliquely is provided with a rotary bearing portion 6b on the base end side thereof, and is driven up and down by an elevator drive mechanism 60 as described below. , And is configured to move between the guide action position P ₁ and the storage position P ₂ .

The elevating drive mechanism 60 is fitted inside the rotating bearing portion 6b of the gauge 6, and the rotating arm 62 is provided with a rotating shaft 61 for rotatably holding the gauge 6 at its tip.
A rotatable bracket 63 provided on the base end side of the rotatable arm 62 and rotatably attached to the body frame 10 together with the rotatable arm 62; A stopper 64 that determines the lower limit position of the gauge 6 by contacting the arm 62,
A return spring S3 having one end fixed to the universal bracket 63 and the other end fixed to the rotating arm 62, and a base end rotatably rotatably supported with respect to the main body frame 10, and a tip of a slider 65a thereof. And a lifting / lowering shifter 65, such as an electric cylinder, which is rotatably supported by the flexible bracket 63.

The way in which the gauge 6 is driven up and down by the lifting drive mechanism 60 will be described in the light of the actual work of cutting the paved road surface as the workpiece W by the cutting device 1. First, a cutting guide line is drawn on the surface of the paved road surface to be cut (that is, the processed surface A). Next, the blade B is aligned so as to be located on this cutting guide line, and then the slider 65a of the elevating shifter 65 is extended, and the universal bracket 63 is rotated by approximately 90 ° to move the gauge 6 to the guide action position P _1. Lead to. Incidentally, in this state, the lower end of the gauge 6 is located slightly above the work surface A.

Then, the operator holds the operation handle 70 in his hand and operates so that the gauge 6 is always positioned on the cutting guide line, and cuts the paved road surface with the blade B. At this time, even if changes in undulations or irregularities due to foreign matter appear on the cutting guide line in the middle, if it is small, the gauge 6 rotates about the rotation shaft 61, so there is no particular problem in traveling. .

When the undulations or irregularities become larger and the gauge 6 cannot be rotated by itself, the slider 65a of the elevating shifter 65 is contracted to rotate the universal bracket 63 and the rotating arm 62. Let me gauge 6
To avoid a large amount. After passing through the undulations or irregularities, the slider 65a of the elevating shifter 65 is extended again, and the gauge 6 provided at the tip of the rotating arm 62 is lowered to the guide action position P ₁ .

After the processing with the blade B is completed, the slider 65a of the elevating shifter 65 is fully contracted to bring the gauge 6 to the retracted position P ₂ .
A locking ring 66 is provided near the tip of the rotating arm 62. If necessary, one end of a rope or the like is locked to the locking ring 66 and the other end of the rope or the like is locked. By extending the operation handle 70 side, in addition to the elevating drive of the gauge 6 by the elevating shifter 65, the elevating movement of the gauge 6 can be performed by pulling and loosening this rope or the like. It is a thing.

The blade cover 2 of the present invention and the cutting device 1 equipped with the blade cover 2 of the present invention are used for cutting road surfaces paved with concrete, asphalt or the like. The cutting device 1 including the above is not limited to this, and cuts a concrete foundation or block, or the traveling drive wheel 30 and the auxiliary wheel 31.
In place of the blade B, the main body frame 10 is supported by a guide rail, which is driven by, for example, a screw shaft having a ball screw or a trapezoidal screw engraved and a female screw block screwed to the screw shaft. By attaching a plate-shaped grindstone, it is possible to use it as a cutting device 1 for cutting wood or a metal material.

[0057]

The blade cover in the cutting device for concrete or the like of the present invention is constituted by having the above-mentioned constitution, and by having such constitution, the following effects are exhibited. . First, in the blade cover of the concrete cutting device according to claim 1, the blade cover 2 is composed of a lower frame 20 and a cover main body 25 provided integrally with the lower frame 20, and the main body of the lower frame 20 and the cover main body 25. Shaft escape portions 24 and 29 are formed in a part on the frame 10 side to avoid interference with the rotating shaft 12 of the blade B and allow a change in relative position between the blade B and the blade cover 2.
As a result, the cover main body 25 and the lower frame 20 can be integrally attached to and detached from the main body frame 10 without being separated, which improves workability and also the shaft escape portions 24, 29.
The presence of the blade B prevents the blade B from interfering with the rotary shaft 12 and can cope with a change in the relative position between the blade B and the blade cover 2.

In the blade cover of the concrete cutting device according to the second aspect of the present invention, the side surface of the cover body 2 on the side of the body frame 10 is provided with the receiving metal fitting 28 that is loosely fitted to the regulating plate 13 provided on the body frame 10. An engaging rod 23 having a rotating shaft portion 23a is provided on the rear side of the lower frame 20 in the traveling direction. Accordingly, when the blade cover 2 is attached, the blade cover 2 is covered over the blade B from above so that the regulation plate 13 fits into the receiving metal fitting 28, and the engagement rod 23 is provided on the body frame 10. It is completed only by attaching so as to engage with the hook 14, and the workability is remarkably improved, and the fitting between the regulation plate 13 and the receiving metal fitting 28 is loosely set so that the blade centering around the rotating shaft portion 23a is provided. The cover 2 can be rotated over a range of a certain angle.

The blade cover in the cutting device for concrete or the like according to claim 3 receives suction by the vacuum device 4 between the blade cover 2 and the main body frame 10 to close the shaft escape portions 24 and 29. Is provided. With this, the vacuum device 4
When the vacuum device 4 is not driven, the blade cover 2 is not restricted by the closing shutter 15 and can be easily attached and detached, and when the vacuum device 4 is driven, the shaft escape portions 24 and 29 are closed by the closing shutter 15. The suction force of the device 4 does not decrease. Furthermore, since the drive mechanism for the closing shutter 15 is not required, the weight is not increased.

In the blade cover in the cutting device for concrete or the like according to the fourth aspect, the closing shutter 15 is provided with the engaging elongated hole 17 in the upper part and the avoiding hole 18 in the lower part, and at least the shaft escape portion 24 around the avoiding hole 18. , 29 are formed so as to cover all 29, 29. As a result, the closing shutter 15 can be moved to the cover body 25 side along the rotation axis 12 of the blade B by the suction force of the vacuum device 4, and the closing surface 19 thereof.
As a result, the shaft escape portions 24 and 29 are completely closed, and a decrease in the suction force of the vacuum device 4 is prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a cutting device for concrete or the like to which a blade cover of the present invention is applied.

FIG. 2 is a rear view of the same.

FIG. 3 is a side view showing the transmission mechanism of the prime mover and the transmission and the traveling operation mechanism in a see-through manner.

FIG. 4 is an exploded perspective view showing the vicinity of a blade cover attachment portion of the present invention.

FIG. 5 is a vertical sectional front view of the same.

FIG. 6 is a vertical sectional side view showing a lever return prevention mechanism.

7A and 7B are a vertical sectional side view and a front view showing an enlarged operation lever and lever position holding mechanism.

FIG. 8 is a side view showing a drive transmission mechanism of the vacuum device.

FIG. 9 is an exploded perspective view showing a gauge and a lifting drive mechanism thereof.

FIG. 10 is a side view of the same.

FIG. 11 is a vertical sectional side view showing the structure of a conventional blade cover.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Blade cover 3 Travel mechanism 3A Travel operation mechanism 4 Vacuum device 5 Motor 6 Gauge 6a Gauge piece 6b Rotating bearing part 10 Main body frame 11 Shaft holder 12 Rotating shaft 13 Regulation plate 13a Locking pin 13b Engaging pin 14 Engagement Combined hook 15 Closure shutter 16 Ear 17 Engagement slot 18 Avoid hole 19 Closure surface 20 Lower frame 20a Connection port 20b Suction port 21 Brush 22 Handle 23 Engaging rod 23a Rotating shaft 24 Shaft escape 25 Cover body 26 Side plate 27 Body Plate 28 Receiving Metal Fitting 29 Shaft Escape Part 30 Travel Drive Wheel 31 Auxiliary Wheel 32 Transmission 33 Biasing Arm 34 Control Shaft 35 Control Lever 35a Rotating Shaft 36 Lever Position Holding Mechanism 36a Holding Bracket 36b Fitting Hole 36c Engagement Groove 36d Spring holder 36e Stopper 37 Lock bar 38 Lever return prevention mechanism 38a Outer disc 38b Friction disc 38c Bolt 39 Connecting rod 40 Vacuum unit 41 Discharge pump 42 Suction blower 42a Exhaust port 43 Vacuum tank 44 Dust collection basket 45 Communication line 45a Suction line 45b Exhaust pipe Line 45c Drainage line 46 Drive transmission mechanism 47 Intermediate shaft pulley 47a Driven pulley 48 Reducer pulley 49 Blower drive pulley 50 Output pulley 60 Lifting drive mechanism 61 Rotating shaft 62 Rotating arm 63 Flexible bracket 64 Stopper 65 Lifting shifter 65a Sliding Doko 66 locking ring 70 operating handle 80 fixed bracket 81 bellows A treated surface A _i air B blade B _F transmission flat belt B _V transmission belt F cooling fan H housing L _i liquid fraction P ₁ guiding action position P ₂ storage position P _T tension -S1 Energizing spring S2 Pressing spring S3 Return spring S _O Solid content T Torque limiter W Workpiece

Claims (4)

[Claims] 1. A blade for directly acting on a work piece to cut the work piece, and a traveling mechanism for assisting in moving or moving a cutting device including the blade in a traveling direction at a lower portion of a main body frame. In addition to the above, in the cutting device such as concrete in which at least a prime mover serving as a drive source of the blade is mounted on the main body frame, the protection member of the blade has a constant gap with respect to the work surface. A lower frame that is spaced apart and that surrounds the periphery of the blade in the horizontal cross-sectional direction; and a cover body that is integrally provided above the lower frame and above the lower frame. A part of the main body frame side of the main body avoids interference with the rotating shaft of the blade and allows a change in relative position between the blade and the blade cover. A blade cover in a cutting device for concrete or the like, characterized in that a shaft escape portion is formed. 2. The side plate on the main body frame side of the cover main body is provided with a receiving metal fitting that accepts the entry of a restriction plate provided on an end side of the main body frame facing the main plate and loosely fits the side plate. An engaging rod is provided on the rear side of the lower frame in the traveling direction, and the rotating shaft portion of the engaging rod engages with an engaging hook provided on the main body frame. The blade cover in a cutting device for concrete or the like according to claim 1, wherein the blade cover is configured to be rotatable about a range of a constant angle about a moving shaft portion. 3. A closing shutter is provided between the blade cover and the main body frame to close the shaft escape portion by receiving suction from the vacuum device. A blade cover for the cutting device for concrete or the like described. 4. The closing shutter has an engagement elongated hole for engaging with an engagement pin provided on both side surfaces of the regulation plate at an upper portion, and has a diameter slightly larger than a rotation axis of the blade. The blade cover in a cutting device for concrete or the like according to claim 3, wherein the avoiding hole is provided at a lower portion, and a closing surface that covers at least the shaft escape portion is formed around the avoiding hole.