KR20150033502A - a cutting device of the concrete floor - Google Patents

Abstract

The present invention relates to a concrete cutting device which can cut floor surfaces of a building, and more specifically, to a concrete dry cutting device having strengthened absorptive power, which improves dust discharge performance by installing multiple dust intake fans to inhale and discharge dust which is generated by cutting indoor floor surfaces of a concrete building, rapidly and completely inhales, filters, and discharges dust generated when cutting concrete floor surfaces by installing a fan absorptive power blocking valve which can temporarily block absorptive power to effectively drop adsorbed dust of a filtering means which adsorbs dust, and prevents environmental pollution and improves durability of the adsorption filtering means, thereby innovatively improving efficiency and economic feasibility of operation.

Description

[0001] The present invention relates to a concrete dry cutting machine having a suction force,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete cutter for cutting a floor of a building, and more particularly, to a concrete cutter for cutting dust from a floor of a concrete building, A plurality of pens are installed and configured to improve dust discharge performance and a pen suction force shutoff valve for temporarily shutting off the suction force so as to effectively reduce the suction dust of the filtration means for adsorbing dust can be provided, It is possible to quickly and perfectly suck and discharge the dust generated at the time of work, thereby preventing environmental pollution and improving the durability of the adsorption filtration means, thereby greatly improving the efficiency and economical efficiency of the operation. Dry cutter.

In general, the cutting operation for cutting a concrete structure such as a floor of a building using a cutting machine causes dirty work environment and pollutes the surrounding environment due to high noise and dust.

In addition, it is necessary to cut the floor of a building when installing or repairing the underground water or telecommunication line, and a wet cutting machine is commonly used as equipment for cutting such concrete floor.

Conventional wet cutting machines are designed to cut water while spraying water to reduce scattering dust generated during rotation of the cutting blade.

In addition, although the wet cutting machine can reduce the generation of scattered dust during the cutting process, when the cutting water is dried after cutting the cutting blade, the dust attached to the floor is wetted with water, . ≪ / RTI >

In addition, when cutting a concrete floor in an interior of a building, it is inconvenient that other work can not be applied together with scattering of water generated during the work.

Therefore, in order to solve the above-mentioned problems, a dry cutting machine equipped with a dust suction device capable of effectively preventing scattered dust from being scattered to the outside of the cover without using water has recently been proposed and used.

As such conventional devices, various devices such as a 'dry cooling cutter' of Patent No. 10-0901847 and a 'vacuum suction type dry cutter' of Patent No. 10-1238326 are known.

Conventionally, the 'anhydrous cooling road cutter' includes a blade main body and a cutting blade attached to the circumference of the blade main body; A driving unit for rotating the blade saw cutting the structure; A cooling unit for cooling the blade saw by a cooling gas; A dust collection unit for collecting dust generated by cutting the structure; And a running portion for adjusting a direction of cutting the structure, wherein the cooling portion includes: a first nozzle for cooling the cutting edge that supplies the cooling gas to the cutting edge; And a second nozzle for cooling the blade main body by supplying the cooling gas to the blade main body.

Therefore, the driving unit, the cooling unit, and the dust collecting unit are organically arranged without using cooling water, so that the user can cut the structure or the concrete structure on the road while freely moving the cutter.

In addition, in the conventional 'vacuum suction type dry cutting machine,' the concrete dust, which rotates in a clockwise direction counterclockwise rotating the cutting blade 1 cutting the concrete bottom face, The dust collecting hose 13 is connected to the suction port 12 located at the front upper end of the dust collector 14 and the dust is sucked in vacuum to separate the dust and air from the cylindrical multi filter 15 mounted in the dust collector 14, And the concrete dust is gathered in the dust container 16 mounted on the lower end of the dust collector 14 and discharged in a bag.

KR 10-0901847 (registration number) 2009.06.02. KR 10-1238326 (registration number) 2013.02.22. KR 10-2013-0066075 (publication number) 2013.06.20.

However, the above-described conventional cutting machine has a problem in that the suction force is limited and the dust that is scattered can not be efficiently sucked and discharged, and the dust is scattered into the room during the cutting operation, thereby causing environmental pollution.

In addition, there is a problem in that the durability is deteriorated and the working efficiency is lowered because it is difficult to shake out the powder dust or the like of the filtration means provided inside the dust receptacle in the state in which the driving means is operated, i.e., the suction force is applied.

In addition, it is difficult to adjust the driving force of the air blast suction pen, and the means for supporting and opening the cover of the cutting edge is insufficient, which makes it difficult to exchange and repair the cutting edge.

Accordingly, the present invention has been made to solve the above problems,

A plurality of dust suction blowing pens having gradual small outlets for increasing the suction speed of the dust generated when cutting the concrete floor, and a suction pump for temporarily blocking the suction force of the engine to remove the dust adsorbed on the filter And a pen speed conversion device that converts the suction speed of the pen into a high speed or a low speed so as to adjust the suction capacity of the suction suction blowing pen can be quickly and completely suctioned The present invention provides a concrete dry cutter having a suction force enhanced to improve efficiency and economical efficiency of operation by enhancing the shifting performance of the durable cutter of the suction filtration means, There is a purpose.

In order to accomplish the above object, the present invention provides a dry cutting machine capable of sucking and purifying dust generated while cutting a concrete floor,

A bottom plate provided with a driving wheel and a driven wheel for moving forward and backward on a lower surface thereof, chain means vertically installed on a front portion of the bottom plate for driving the driving wheels, an operating handle for operating the driving wheels, A body frame divided into a front plate and a lower plate which are slidable up and down to adjust a height of the body frame; The bottom plate is provided with a circular cutting edge that is openable and closable on the front side of the bottom plate so as to collect dust generated during cutting while protecting the cutting edge. A protective cover on the upper surface of the bottom plate, And a drive motor for connecting the cutting blade to the drive belt so as to rotate the cutting blade while the cutting blade is being cut, And a suction blowing pen connected to the dust drain box, one end of the suction fan being connected to the drive engine so as to be rotatable, and the other end being connected to the dust receptacle so as to allow the filtered air to flow therethrough, Wherein the suction blowing pen is formed at an inner center of the suction blowing pen so that the inlet side diameter of the air inlet and outlet passage for discharging air to the outside is formed to be larger than the diameter of the outlet side, Off valve for blocking the suction force of the valve body.

Therefore, the concrete dry cutter having the suction force according to the present invention is capable of quickly and accurately grinding dust by means of multiple dust suction pens whose discharge ports are formed gradually smaller so as to speed up the suction speed of the dust generated in the concrete floor cutting. So that environmental pollution can be prevented in advance.

Further, according to the present invention, since the pen suction force shutoff valve for temporarily blocking the suction force of the engine is installed, the dust adsorbed on the filter can be efficiently removed, and the durability of the filter can be remarkably improved.

In addition, according to the present invention, a pen speed changing device which is converted to a high speed or a low speed so as to adjust the suction ability of the dust suction pen can be provided, whereby the dust suction force can be appropriately changed according to the working environment to improve the working efficiency.

Further, the present invention is equipped with a guide bar, which is a means for opening and closing the cutting edge cover, so that the cutting edge can be easily exchanged and repaired, and a vibration phenomenon can be prevented during operation, contributing to noise reduction.

1 is a schematic perspective view of a concrete dry cutter having a suction force according to the present invention,
FIG. 2 is a schematic sectional view of a concrete dry cutter having a suction force according to the present invention,
FIG. 3 is a schematic view of a speed converting apparatus for converting a cutting edge provided in a concrete dry cutter having a suction force according to the present invention to a high speed or a low speed,
4 is a state view of a guide bar of a protective cover provided in a concrete dry cutter having a suction force enhanced according to the present invention,
FIG. 5 is a schematic sectional view of a multi-suction blowing pen provided in a concrete dry cutter having a suction force according to the present invention,
6 is a schematic sectional view of a multi-suction blowing pen provided in a concrete dry cutter having a suction force according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the concrete dry cutter 100 having a suction force according to the present invention,

A bottom plate 113 provided with a driving wheel 111 and a driven wheel 112 for allowing the front and rear sides of the driving wheel 111 to move forward and backward, And a front plate 117 which is provided with a chain means 114 for driving the upper knob 114 and an operating knob 115 for operating the lower knob 114 and a lower knob 116 for sliding the bottom plate 113 up and down, A body frame 110 formed in an 'a' shape,

A circular cutting blade 120 installed to be rotatable on the front side of the bottom plate 113 and capable of cutting the bottom surface of the concrete while adjusting the height thereof by the operation of the elevation knob 116,

A protective cover 130 installed on the front side of the bottom plate 113 so as to be opened and closed to collect dust generated during cutting while protecting the cutting edge 120,

A drive engine 140 mounted on the upper surface of the bottom plate 113 to connect the cutting edge 120 with a driving belt 141 to rotate the cutting edge 120,

A dust receptacle 150 which is placed on the bottom plate 113 and is stored and stored through a dust inflow hose 151 connected to the protective cover 130 by dust generated as the cutting edge 120 cuts the cut portion, ,

One end of which is connected to the drive engine 140 so as to be rotatable and the other end of which is connected to the dust receptacle 150 so as to be connected to an air discharge hose 152, A pen 160,

The suction air blowing pen 160 is formed at its inner center portion so that the inlet side diameter of the air inlet / outlet passage 161 for discharging air to the outside is formed to be larger than the outlet side diameter, And an on-off valve 170 for blocking the suction force of the suction blowing pen 160 operated by the engine 140.

The suction blowing pen 160 of the present invention may further include a first pen 162 and a second pen 162 so as to enhance the suction force of the filtered air discharged from the dust receptacle 150 through the air inflow / A second pen 163 arranged in parallel to the first pen 162 and a third pen 164 arranged in parallel to the second pen 163, The second pen 163 passes through the second air inlet 163a formed at the center of the second pen 163 from the first air inlet 162a formed at the center of the first pen 162, 164 to a third air inlet 164a formed at the center of the first air inlet 164, while the diameter of the third air inlet 164a is reduced linearly.

Thus, the inlet diameter of the first air inlet 162a is the largest and the outlet diameter of the third air inlet 164a is the smallest.

When the suction blowing pen 160 rotates, the speed of the air that escapes to the outlet of the third air inlet 164a becomes faster than the speed of the air that flows into the inlet of the first air inlet 162a The dust generated by the cutting blade 120 can be quickly sucked into the dust receptacle 150 through the dust inlet hose 151 so that the dust is discharged to the outside of the protective cover 130 It is possible to prevent environmental pollution in the workplace by preventing the outflow.

Accordingly, as the suction and blowing pen 160 is rotated by the driving engine 140, purified air is discharged to the outside through the air inlet / outlet passage 161 formed therein, The suction force of the dust inflow hose 151 connected to the cover 130 is strengthened so that the dust generated by the cutting edge 120 on the inner side of the protective cover 130 is quickly transmitted to the dust receptacle 150 So that the dust scattered toward the outside of the protective cover 130 can be minimized.

The structure in which the body frame 110 is moved forward or backward while the driving wheel 111 is driven by the operating handle 116 and the chain means 114 and the structure in which the body frame 110 is moved forward or backward by the elevation knob 116, 113 are vertically elevated and lowered to adjust the height of the cutting edge 120 can be easily practiced by those skilled in the art based on known techniques, and a detailed description of the structure is omitted.

The dust receptacle 150 is formed of an upper body 150a and a lower body 150b so that they can be separated from each other. The dust inlet hose 151 is formed at the middle portion of the upper body 150a. A filtering unit 153 is installed to filter the dust that enters through the upper body 150a and clean the air with clean air. The dust inlet hose 151 communicates with the lower body of the upper body 150a, 150a are provided on the upper surface side with a sealing lid 154 in which the air discharge hose 152 is communicated.

Accordingly, when the dust is introduced into the upper body 150a of the dust receptacle 150 through the dust inlet hose 151, the dust is filtered by the filtration unit 153 and contaminants are discharged to the lower body 150b Fresh air that has been separated and purified is discharged through the suction blowing pen 160 through the air discharge hose 152 communicated with the sealing lid 154 to the atmosphere.

A pivot vibration rod 155 is installed at an intermediate portion of the upper body 150a forming the dust receptacle 150. One end of the pivot vibration rod 155 protrudes outward and the other end of the pivot vibration rod 155 is connected to the filtering unit 153 .

Therefore, when the pivot vibration rod 155 is manually swung up and down, the filtration unit 153 is shaken and the dust contaminant attached to the pivot vibration rod 155 falls to the lower body 150b, and the filtration unit 153 is cleaned.

If necessary, the sealing lid 154 can be opened and the inside thereof can be maintained.

The body frame 110 is provided with a pen speed converting device 180 including a high speed converting part 181 and a low speed converting part 182 so as to convert the suction blowing pen 160 into high speed or low speed have.

Accordingly, when dust generated during the operation of the cutting edge 120 is large, the high-speed converting unit 181 is operated to discharge the dust at a high speed, and when the generated dust is small, the low-speed converting unit 182 is operated So that dust can be discharged at a low speed, so that it can be appropriately dealt with according to the work site, and the processing operation is very efficient.

3, the high-speed converter 181 includes a large driving pulley 143 fixed to an end of a driving shaft 142 of the driving engine 140, A high speed drive belt 183 that connects a small driven pulley 166 fixed to an end of a driven shaft 165 that rotates the high speed drive belt 183 to rotate the high speed drive belt 183, A high speed operation lever 184 for transmitting the driving force of the pulley 143 to the small driven pulley 166 and a high speed operation pull line 185 for pulling or releasing the high speed operation lever 184.

The high speed operation lever 184 presses the high speed drive belt 183 so that the driving force of the large drive pulley 143 is transmitted to the small driven pulley 166 The rotating speed of the suction blowing pen 160 can be increased and the suction blowing pen 160 can be driven at a high speed.

The high-speed operation lever 184 includes a high-speed front rod portion 184a at which a supporting roller 184r is installed to press the high-speed driving belt 183, And a hinge pivot portion 184h for rotating the high-speed operation lever 184 is provided between the high-speed rear rod portion 184b and the hinge pivot portion 184h.

That is, the high-speed front rod portion 184a and the high-speed rear rod portion 184b are integrated with each other and rotated by the operation of the high-speed operation pulling string 185 around the hinge rotation portion 184h.

Accordingly, when the high-speed operation pulling string 185 is pulled and fixed, the high-speed front rod portion 184a and the high-speed rear rod portion 184b are simultaneously rotated, so that the support roller 184r presses the high-speed drive belt 183 The suction and blowing pen 160 can be driven at a high speed.

When the high-speed actuation pull string 185 is released, the high-speed forward rod portion 184a and the high-speed rear rod portion 184b simultaneously rotate in the opposite direction to release the pressing force of the support roller 184r, The rotational force of the driving belt 183 is not transmitted to the suction blowing pen 160.

Here, elastic means (not shown) may be provided on the end of the high-speed rear rod part 184b to elastically return the same.

The high-speed front rod portion 184a and the high-speed rear rod portion 184b are integrally formed with each other. The high-speed rear rod portion 184b is slightly bent at the end of the high- Is formed.

3, the low-speed converting unit 182 includes a small driving pulley 144 fixed to an end of the driving shaft 142 of the driving engine 140, A low speed drive belt 186 connecting a large driven pulley 167 fixed to an end of the driven shaft 165 which rotates the pen 160 and a low speed drive belt 186 which presses the low speed drive belt 186, A low speed operation lever 187 for allowing the driving force of the small drive pulley 144 to be transmitted to the large driven pulley 167 and a low speed operation pull line 188 for pulling or releasing the low speed operation lever 187 have.

The low speed operation lever 187 presses the low speed drive belt 186 so that the driving force of the small drive pulley 144 is transmitted to the large driven pulley 167 The rotation speed of the suction blowing pen 160 can be lowered and the suction blowing pen 160 can be driven at a lower speed.

The low speed operation lever 187 is provided at its end with a low speed forward rod portion 187a on which a low speed support roller 187r is provided so as to press the low speed drive belt 186 and a low speed forward pull rod 187a on the low speed operation pull line 188 And a low speed hinge pivot portion 187h for pivoting the low speed operation lever 187 is provided between the lower speed hinge pivot portion 187b and the low speed rear portion 187b.

That is, the low speed forward rod portion 187a and the low speed rear rod portion 187b are integrated with each other and are rotated by the operation of the low speed operating pull string 188 around the low speed hinge rotation portion 187h .

Accordingly, when the low-speed driving pulling string 188 is pulled and fixed, the low-speed forward rod portion 187a and the low-speed rear rod portion 187b are simultaneously rotated so that the low-speed supporting roller 187r moves the low- So that the suction blowing pen 160 can be driven at a low speed.

When the low-speed driving pulling string 188 is released, the low-speed forward rod portion 187a and the low-speed rear rod portion 187b simultaneously rotate in the opposite direction, The rotational force of the low-speed drive belt 186 is not transmitted to the suction blowing pen 160.

Here, elastic means (not shown) for elastically returning the end portion of the low-speed rear rod portion 187b may be provided.

The low speed forward rod portion 187a and the low speed rear rod portion 187b are integrally formed with each other. The low speed rear rod portion 187b is bent slightly at an end of the low speed forward rod portion 187a, .

As described above, the high-speed converting unit 181 and the low-speed converting unit 182 are selectively operated to suitably drive and operate the wind-blowing force of the suction blowing pen 160 at a high speed or a low speed according to the cutting environment of the floor surface .

The protective cover 130 may include a round portion 131 for receiving and protecting the cutting edge 120 and a protective cover 130 connected to one end of the round portion 131, A rotation lever portion 132 for rotating the cutting blade 120 to expose the cutting blade 120 to the outside, and dust generated during cutting at the other end of the round portion 131 to be supplied to the dust inlet hose 151 And a dust discharging passage 133 formed in the body frame 110. The side surface of the round portion 131 is formed with a slot for allowing the hook portion 118 of the body frame 110 to be slidably engaged with the hook groove 118. [ Shaped guide bar 134 is provided.

A rotation fixing pin 135 is provided at an end of the rotation lever portion 132 so as to be rotatable while being fixed to the body frame 110. The front end portion of the round portion 131 is provided on the ground And a guide wheel 136 for supporting the guide wheels 136 while being supported thereon.

When the protective cover 130 is rotated in the counterclockwise direction, the protective cover 130 is rotated about the rotation fixing pin 135 provided at the end of the rotation lever portion 132, (120) is exposed to the outside.

At this time, the fitting hook guide bar 134 is released from the hooking groove portion 118 while sliding out of the hooking groove portion 118, and when the protective cover 130 is rotated clockwise, The protective cover 130 is rotated about the pin 135 so that the cutting edge 120 is received and protected inside the round portion 131. At this time, The protective cover 130 can be firmly fixed to the body frame 110 while being fixed to the groove 118.

In addition, the cutting edge 120 is configured to rotate in a counterclockwise direction, which rotates to the rear side when the body frame 110 advances, so that dust generated as the concrete bottom surface is cut off, So that the dust that has flowed into the dust discharge passage 133 can be easily collected into the dust receptacle 150 through the dust suction hose 151.

Accordingly, the dust collected in the dust receptacle 150 is filtered through the filtration unit 153, and the foreign matter is collected into the lower body 150b provided at the lower side and the purified air is collected through the air discharge hose 152 Through the air blow-in suction pen 160, and then discharged into the atmosphere.

The driving shaft 142 of the driving engine 140 is provided with a cutting edge driving pulley 145 on which the driving belt 141 is mounted to transmit the rotational force to the cutting edge 120 .

Reference numeral 168 denotes an installation cover for fixing the suction and blowing pen 160.

Hereinafter, the procedure and function of operating the concrete dry cutter 100 having the above-described structure and having enhanced suction force according to the present invention will be described.

First, the height of the cutting edge 120 is adjusted using the elevation knob 116, and then the body frame 110 is advanced while driving the driving wheel 111 through the operation knob 115.

The driving force of the driving engine 140 is transmitted to the cutting edge 120 through the driving belt 141 so that the cutting edge 120 cuts the concrete floor structure to a controlled depth.

In this case, dust is generated from the concrete floor structure by the cutting operation of the cutting edge 120.

At this time, the driving force of the driving engine 140 is applied to the suction blowing pen 160 through the driven shaft 165 according to the operation of either the high speed converting unit 181 or the low speed converting unit 182 do.

Here, a case where the suction blowing pen 160 is operated at a high speed while the high-speed converting unit 181 is operated will be described.

According to the operation of the suction and blowing pen 160, the dust generated inside the protective cover 130 by the cutting operation of the cutting edge 120 is discharged through the dust discharge passage 133 provided at the end thereof And then flows into the dust receptacle 150 through the dust inlet hose 151.

The dust introduced into the dust receptacle 150 is filtered by the filtration means 153 installed inside the dust receptacle 150 and contaminants are accumulated in the lower body 150b, Through the air discharge hose 152 provided in communication with the suction blowing pen 160, and then escapes into the atmosphere.

During this process, the pivot vibration rod 155 is manually swung up and down to drop the dust contaminant attached to the filtration means 153 to the lower body 150b to optimize the filtration means 153 It keeps.

When the pivot vibration rod 155 is operated, the opening / closing valve 170 provided in the air discharge hose 152 is closed to cut off the suction force of the suction blow pen 160.

Accordingly, the suction force of the suction blowing pen 160 does not reach the dust receptacle 150, so that the dust adsorbed by the filtering means 153 is easily separated into the lower body 150b.

In this way, the lower body 150b is periodically removed from the separation receptacle 150, and the accumulated dust is discarded through a separate incision.

As described above, according to the present invention, the concrete dry type cutter with enhanced suction force is provided with a plurality of dust suction blowing pens whose discharge ports are gradually reduced in order to speed up the suction speed of dust generated in the concrete floor cutting, A pen suction force shutoff valve for temporarily shutting off the suction force of the engine so as to remove adsorbed dust and a pen speed changing device for converting the suction speed of the dust suction blow pen into the high speed or the low speed so as to adjust the suction capacity of the dust suction blow pen, Dust generated during the surface cutting operation can be quickly and completely sucked out and filtered to prevent environmental pollution. At the same time, the durability of the suction filtration means improves the shifting performance of the cutter, thereby dramatically improving the efficiency and economy of work. .

100: Concrete dry cutter with enhanced suction power
110: Body frame
111: driving wheel 112: driven wheel 113: bottom plate 114: chain means
115: operating handle 116: elevating handle 117: front plate 118: hooking groove
120: cutting edge
130: protective cover
131: Round section 132: Rotation lever section 133: Dust discharge passage passage
134: guide hook 135: pivot pin 136: guide wheel
140: drive engine 141: drive belt 142: drive shaft 143: large drive pulley
144: small drive pulley 145: cutting edge drive pulley
150: dust receptacle 150a: upper body 150b: lower body
151: dust inflow hose 152: air discharge hose 153: filtration means
154: sealing lid 155: pivot vibration rod
160: suction blowing pen
161: air inlet / outlet passage 162: first pen 162a: first air inlet
163: second pen 163a: second air inlet 164: third pen 164a: third air inlet
165: driven shaft 166: small driven pulley 167: large driven pulley 168: mounting cover
170: opening / closing valve
180: pen speed converter
181: high speed conversion unit 182: low speed conversion unit 183: high speed drive belt 184: high speed operation lever
185: high-speed operation pull line 186: low speed drive belt 187: low speed operation lever
188: Low-speed actuation tow
184a: high speed forward rod portion 184b: high speed rear rod portion 184h: hinge rotation portion
184r: Support roller
187a: Low speed forward rod part 187b: Low speed rearward rod part 187h: Low speed hinge rotation part
187r: Low speed support roller

Claims (7)

A dry cutting machine capable of sucking and purifying dust generated while cutting a concrete floor,
A bottom plate provided with a driving wheel and a driven wheel for moving forward and backward on a lower surface thereof, chain means vertically installed on a front portion of the bottom plate for driving the driving wheels, an operating handle for operating the driving wheels, And a front plate on which a height knob for adjusting a height of the front plate is installed,
A circular cutting blade installed on the front side of the bottom plate so as to be rotatable and capable of cutting the bottom surface of the concrete while adjusting the height thereof by the operation of the elevation knob,
A protective cover installed on the front side of the bottom plate so as to be openable and closable to collect dust generated during cutting while protecting the cutting edge,
A driving engine mounted on an upper surface of the bottom plate to connect the cutting edge to a driving belt and rotate the cutting edge,
A dust receptacle which is received in the dust receptacle through a dust inlet hose connected to the protective cover,
A suction blowing pen having one end connected to the drive engine so as to be rotatable and the other end connected to the dust receptacle and connected to an air discharge hose through which the filtered air can flow,
Wherein the suction blowing pen is formed at an inner center of the suction blowing pen so that the inlet side diameter of the air inlet and outlet passage for discharging air to the outside is formed to be larger than the diameter of the outlet side, And a shut-off valve for shutting off the suction force of the suction force.
The method according to claim 1,
The suction and blowing pen may include a first pen and a second pen arranged in parallel to the first pen so that the air filtered and filtered in the dust receptacle can be discharged to the outside through the air discharge hose provided at the end of the dust receptacle, A plurality of pens connected by a pen and a third pen arranged in parallel with the second pen,
The air inlet / outlet path includes a first air inlet formed at the center of the first pen, a second air inlet formed at the center of the second pen, and a third air inlet formed at the center of the third pen ,
Wherein the air inlet / outlet passage is continuously installed so that the diameter from the first air inlet to the third air inlet is linearly reduced.
3. The method of claim 2,
Wherein the body frame is provided with a pen speed converting device including a high speed converting part and a low speed converting part for converting the suction blowing pen into high speed or low speed,
Wherein the high-speed drive unit includes a high-speed drive belt for connecting a large drive pulley fixed to an end portion of the drive shaft of the drive engine and a small driven pulley fixedly installed at an end portion of a driven shaft that rotates the suction blowing pen, A high-speed operation lever for transmitting a driving force of the large drive pulley to the small driven pulley, and a high-speed operation pull line for pulling or releasing the high-speed operation lever,
The high-speed operation lever includes a high-speed front rod portion at which a supporting roller is installed so as to press the high-speed driving belt and a high-speed rear rod portion at which the high-speed operation pull line is connected at an end portion, A hinge rotation unit for enabling rotation of the operation lever is provided,
Wherein the low speed conversion unit includes a low speed drive belt for connecting a small drive pulley fixed to the drive shaft end portion of the drive engine and a large driven pulley fixedly installed at an end portion of the driven shaft for rotating the suction blow pen, A low speed operating lever for pressing the low speed operating lever to transmit the driving force of the small driving pulley to the large driven pulley and a low speed operating pull line for pulling or releasing the low speed operating lever,
The low-speed operation lever includes a low-speed front rod portion provided with a low-speed support roller for pressing the low-speed drive belt at an end thereof, and a low-speed rear rod portion connected to the low- And a low-speed hinge pivoting portion for pivoting the low-speed operation lever is provided,
Wherein the suction blowing pen is operated by either the high speed converting unit or the low speed converting unit.
5. The method of claim 4,
The protective cover may include a round portion for receiving and protecting the cutting edge, a rotation lever portion connected to one end of the round portion and rotating the protective cover to one side to expose the cutting edge to the outside, And a dust discharge passage formed at the other end of the round portion and configured to supply dust generated during cutting to the dust inlet hose. The side surface of the round portion is slidably fitted in a hook recess provided in the body frame. And a suction force guide bar provided with a '?'
6. The method of claim 5,
The dust receptacle is composed of an upper body and a lower body. The dust receptacle has a structure in which the dust and the dust are separated from each other. A filtration means for filtering and purifying the dust introduced through the dust inlet hose is installed at the middle portion of the upper body. And a hermetically sealed lid in which the dust inlet hose is communicated at the lower side of the upper body and the air discharge hose connected to the suction blow pen is communicated at the upper side of the upper body, .
6. The method of claim 5,
One end of the upper body is protruded to the outer side and the other end is connected to the filtration means to vibrate the filtration means so as to drop the adsorbed dust on the middle portion side of the upper body provided in the dust receptacle. Concrete dry cutting machine with installed suction power.
The method of claim 3,
Wherein the high-speed rear rod portion and the low-speed rear rod portion are further provided with elastic means for elastically restoring the high-speed rear rod portion and the low-speed rear rod portion.

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