CN113295449A - Automatic sampling equipment for underground coal sample of coal mine - Google Patents
Automatic sampling equipment for underground coal sample of coal mine Download PDFInfo
- Publication number
- CN113295449A CN113295449A CN202110438159.1A CN202110438159A CN113295449A CN 113295449 A CN113295449 A CN 113295449A CN 202110438159 A CN202110438159 A CN 202110438159A CN 113295449 A CN113295449 A CN 113295449A
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- 239000003245 coal Substances 0.000 title claims abstract description 75
- 238000005070 sampling Methods 0.000 title claims abstract description 48
- 239000000428 dust Substances 0.000 claims abstract description 48
- 238000009434 installation Methods 0.000 claims abstract description 42
- 238000005520 cutting process Methods 0.000 claims abstract description 40
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000003651 drinking water Substances 0.000 claims description 6
- 235000020188 drinking water Nutrition 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 abstract description 15
- 239000002245 particle Substances 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 9
- 239000008187 granular material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the technical field of coal bed gas exploration, in particular to automatic sampling equipment for coal samples in a coal mine well, which comprises an installation shell, wherein handheld frames are symmetrically installed at the upper end and the lower end of the installation shell, a storage battery is clamped in the installation shell, an installation disc is vertically connected to the front end of the installation shell, a slitting and sampling mechanism is arranged at the end part of the installation disc, the slitting and sampling mechanism comprises a motor fixedly installed at the end part of the installation disc, the motor is connected with the storage battery through a conducting wire, an output shaft of the motor penetrates through the installation disc, a shaft sleeve is fixedly sleeved at the end part of the motor, a cutting blade is fixedly sleeved at the middle position of the outer side of the shaft sleeve, and a dust collecting disc cover is arranged at the outer side of the cutting blade. The device can be used for conveniently and rapidly sampling the coal matrix particles in the underground coal mine, has the functions of positioning and dust falling, and effectively improves the practicability of the operation of the device.
Description
Technical Field
The invention relates to the technical field of coal bed gas exploration, in particular to automatic sampling equipment for underground coal mine coal samples.
Background
The coal bed gas is a gas resource associated with coal and symbiotic with the coal, refers to hydrocarbon gas stored in a coal bed, takes methane as a main component, and belongs to unconventional natural gas. The coal bed gas mainly adsorbs the surfaces of coal matrix particles, and part of the hydrocarbon gas is dissociated in coal pores or dissolved in coal bed water, is an associated mineral resource of coal, and is a clean and high-quality energy and chemical raw material which rises internationally in nearly twenty years. In the process of exploring coal bed gas, a target coal bed is generally sampled, analyzed and tested, and particularly, coal samples are used for adsorption/desorption experiments to analyze and research the resource condition of the coal bed gas, so as to scientifically guide the exploration and development of the coal bed gas. The prior art has the problem of sample loss in drilling while-drilling sampling, and brings inconvenience to test analysis. Therefore, manual sampling needs to be performed from a corresponding sample losing coal seam under the coal mine. Therefore, the automatic sampling equipment for the coal sample in the coal mine is provided, and the coal sample can be conveniently and accurately sampled when the coal mine is sampled.
Disclosure of Invention
The invention aims to solve the problem of sample loss during sampling in the prior art, and provides automatic sampling equipment for underground coal mine coal samples.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: an automatic sampling device for coal samples in a coal mine comprises an installation shell, wherein handheld frames are symmetrically installed at the upper end and the lower end of the installation shell, a storage battery is clamped in the installation shell, an installation disc is vertically connected to the front end of the installation shell, a slitting and sampling mechanism is arranged at the end part of the installation disc and comprises a motor fixedly installed at the end part of the installation disc, the motor is connected with the storage battery through a wire, an output shaft of the motor penetrates through the installation disc, a shaft sleeve is fixedly sleeved at the end part of the motor, a cutting sheet is fixedly sleeved at the middle position of the outer side of the shaft sleeve, a dust collection disc cover is arranged on the outer side of the cutting sheet, a sliding groove is formed in one end, close to the installation disc, of the dust collection disc cover, the shaft sleeve is slidably inserted into the sliding groove, the dust collection disc cover is connected with the installation shell through a sliding mechanism, and a lower hopper is communicated with the bottom end of the dust collection disc cover, threaded pipe is installed in the bottom intercommunication of hopper down, the outside screw thread of threaded pipe has cup jointed the sampling bottle the last lower extreme of collection dirt dish cover port department all is provided with positioning mechanism.
Preferably, many lower troughs have all been seted up along the circumferencial direction equidistance at the both ends of cutting piece, just the tooth's socket of cutting piece all is the arc setting of tilt up with lower trough.
Preferably, the axle sleeve outside at cutting piece both ends all installs the polylith along the circumferencial direction equidistance and drives dirt blade, drive dirt blade all be the arc setting and with the collection dirt dish cover inner wall between leave the clearance.
Preferably, slide mechanism includes the sliding sleeve of fixed mounting at the middle border position of dust collection disk cover near installation casing one end, the equal horizontal slip cartridge in both sides has U type pole, two the U type pole is installed jointly at installation casing surface the sliding sleeve is kept away from the U type pole outside of installation disk one end and is all overlapped and be equipped with reset spring.
Preferably, positioning mechanism includes the vertical fixed block of connecting at collection dirt dish cover port tip, the intermediate position horizontal slip cartridge of fixed block has T type post, the T type post is kept away from collection dirt dish cover one end fixed mounting and is had the locating piece, T type post outside cover between locating piece and the fixed block is equipped with buffer spring the locating piece is kept away from the terminal surface of T type post one side and is provided with many anti-skidding teeth.
Preferably, the equal fixed mounting in port below inner wall both sides of collection dirt dish cover has the brush board, two the brush board is close to one side each other and all installs the brush pad, the cutting piece centre gripping is between two brush pads.
Preferably, the top of collection dirt dish cover is provided with dust fall mechanism, dust fall mechanism includes that fixed mounting keeps away from the water tank of installation casing one end at collection dirt dish cover, the top of water tank is provided with micro-water pump and water filling port respectively, through drinking-water pipe intercommunication between micro-water pump's the mouth of drinking water and the inside bottom of water tank, the atomising head is installed through raceway intercommunication to micro-water pump's delivery port, the atomising head slope is installed on collection dirt dish cover top, just be connected through the wire between micro-water pump and the battery.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the storage battery, the motor and the cutting piece are arranged, so that hard coal bed walls can be cut, and coal matrix particles generated by cutting can be transferred to the interior of the dust collecting disc cover through the arranged feeding trough, so that the coal matrix particles are collected to the interior of the sampling bottle through the feeding hopper and the threaded pipe, and the purpose of automatic sampling is achieved;
2. the dust-driving blades are arranged, so that the dust-driving blades can be driven to rotate rapidly under the driving of the shaft sleeve, and the coal matrix particles generated by cutting are rapidly introduced into the dust collecting disc cover by the generated wind pressure, so that the sampling efficiency of the sampling bottle on the coal matrix particles is accelerated;
3. the anti-skid teeth, the positioning blocks, the T-shaped columns, the fixing blocks, the sliding sleeves, the return springs and the U-shaped rods are arranged, so that the stability of the cutting blade and the dust collecting disc cover in the cutting process can be improved;
4. through setting up drinking-water pipe, miniature pump and raceway to can carry the water of water tank inside to the atomising head inside, through atomizing mode blowout, carry out the dust fall with the produced coal matrix granule dust of cutting piece and handle, effectively ensure the operational environment of sample.
Drawings
FIG. 1 is a schematic structural diagram of an automatic sampling device for underground coal mine samples according to the present invention;
FIG. 2 is a schematic diagram of an axial measurement structure of an automatic sampling device for a coal sample in a coal mine according to the present invention;
FIG. 3 is an enlarged view of the structure at A in FIG. 2;
FIG. 4 is a schematic structural diagram of a slitting and sampling mechanism of the automatic sampling equipment for the underground coal sample of the coal mine, which is provided by the invention;
FIG. 5 is an enlarged view of the structure at B in FIG. 4;
fig. 6 is a schematic structural diagram of a cutting blade of the automatic sampling equipment for the coal sample in the coal mine provided by the invention.
In the figure: the device comprises a mounting shell 1, a storage battery 2, a handheld frame 3, a mounting disc 4, a motor 5, a spray head 6, anti-skidding teeth 7, a cutting blade 8, a discharging groove 9, a buffer spring 10, a threaded pipe 11, a sampling bottle 12, a discharging hopper 13, a dust collecting disc cover 14, a positioning block 15, a T-shaped column 16, a return spring 17, a water pumping pipe 18, a water tank 19, a micro water pump 20, a water filling port 21, a water conveying pipe 22, a fixing block 23, a sliding sleeve 24, a shaft sleeve 25, dust removing blades 26, a sliding groove 27, a hairbrush plate 28, a hairbrush pad 29 and a U-shaped rod 30.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
As shown in fig. 1-6, the automatic sampling device for coal sample in coal mine comprises an installation shell 1, hand-held frames 3 are symmetrically installed at the upper end and the lower end of the installation shell 1, a storage battery 2 is clamped in the installation shell 1, an installation disc 4 is vertically connected at the front end of the installation shell 1, a cutting and sampling mechanism is arranged at the end part of the installation disc 4, the cutting and sampling mechanism comprises a motor 5 fixedly installed at the end part of the installation disc 4, the motor 5 is connected with the storage battery 2 through a conducting wire, an output shaft of the motor 5 penetrates through the installation disc 4, a shaft sleeve 25 is fixedly sleeved at the end part, a cutting blade 8 is fixedly sleeved at the middle position of the outer side of the shaft sleeve 25, a plurality of lower feed grooves 9 are equidistantly arranged at the two ends of the cutting blade 8 along the circumferential direction, tooth grooves of the cutting blade 8 and the lower feed grooves 9 are both in an upward inclined arc shape, and a dust collecting disc cover 14 is arranged at the outer side of the cutting blade 8, a chute 27 is formed in one end, close to the mounting disc 4, of the dust collection disc cover 14, a shaft sleeve 25 is inserted into the chute 27 in a sliding mode, the dust collection disc cover 14 is connected with the mounting shell 1 through a sliding mechanism, a blanking hopper 13 is installed at the bottom end of the dust collection disc cover 14 in a communicating mode, a threaded pipe 11 is installed at the bottom end of the blanking hopper 13 in a communicating mode, a sampling bottle 12 is sleeved on the outer side of the threaded pipe 11 in a threaded mode, and positioning mechanisms are arranged at the upper end and the lower end of the port of the dust collection disc cover 14; through setting up battery 2, motor 5 and cutting piece 8 to can cut the processing to the coal seam wall of stereoplasm, the silo 9 can be forwarded to collection dirt dish cover 14 inside with the produced coal base material granule of cutting simultaneously down through setting up, with this through hopper 13 and screwed pipe 11 collect the coal base material granule to sampling bottle 12 inside, thereby reach the automatic sampling purpose.
A plurality of dust-driving blades 26 are arranged on the outer sides of the shaft sleeves 25 at the two ends of the cutting blade 8 at equal intervals along the circumferential direction, and the dust-driving blades 26 are arranged in an arc shape and leave gaps with the inner wall of the dust collecting disc cover 14; through setting up and driving dirt blade 26 to can drive under axle sleeve 25 and drive dirt blade 26 and rotate fast, with this produce wind pressure and will cut produced coal matrix granule and introduce the dust collection disk cover 14 inside fast, with this sample bottle 12 sampling efficiency to the coal matrix granule that accelerates.
The sliding mechanism comprises a sliding sleeve 24 fixedly installed at the middle edge position of one end, close to the installation shell 1, of the dust collection disk cover 14, the upper side and the lower side of the sliding sleeve 24 are horizontally slid and inserted with U-shaped rods 30, the two U-shaped rods 30 are jointly installed on the outer surface of the installation shell 1, the outer sides of the U-shaped rods 30, far away from the installation disk 4, of the sliding sleeve 24 are sleeved with return springs 17, the positioning mechanism comprises fixing blocks 23 vertically connected to the end part of the port of the dust collection disk cover 14, T-shaped columns 16 are horizontally slid and inserted at the middle positions of the fixing blocks 23, positioning blocks 15 are fixedly installed at the ends, far away from the dust collection disk cover 14, of the T-shaped columns 16, buffer springs 10 are sleeved on the outer sides of the T-shaped columns 16 between the positioning blocks 15 and the fixing blocks 23, and a plurality of anti-skid teeth 7 are arranged on the end faces, far away from the T-shaped columns 16, of the positioning blocks 15; the sliding sleeve 24, the U-shaped rod 30 and the return spring 17 are arranged, so that the dust collection disk cover 14 can be tightly connected with the installation shell 1, and the anti-slip teeth 7, the positioning blocks 15, the T-shaped columns 16 and the fixing blocks 23 are arranged, so that the anti-slip teeth, the positioning blocks 15, the T-shaped columns 16 and the fixing blocks 23 are tightly attached to the hard coal wall, and the stability of the cutting blade 8 and the dust collection disk cover 14 in the cutting process is improved.
Both sides of the inner wall below the port of the dust collecting disc cover 14 are fixedly provided with brush plates 28, one side of each two adjacent brush plates 28 is provided with a brush pad 29, and the cutting blade 8 is clamped between the two brush pads 29; the brush plate 28 is provided, so that the brush pad 29 can be mounted on the inner wall of the dust collecting tray cover 14, and the brush pad 29 can clean the tooth grooves on the cutting blade 8 and the residual coal substrate particles in the discharging chute 9 during the rotation process.
The top of the dust collection disc cover 14 is provided with a dust falling mechanism, the dust falling mechanism comprises a water tank 19 fixedly mounted at one end of the dust collection disc cover 14 far away from the mounting shell 1, the top end of the water tank 19 is respectively provided with a micro water pump 20 and a water injection port 21, a water pumping port of the micro water pump 20 is communicated with the bottom end inside the water tank 19 through a water pumping pipe 18, a water outlet of the micro water pump 20 is communicated with and mounted with an atomizing head 6 through a water conveying pipe 22, the atomizing head 6 is obliquely mounted at the top end of the dust collection disc cover 14, and the micro water pump 20 is connected with the storage battery 2 through a lead; through setting up drinking-water pipe 18, micro-water pump 20 and raceway 22 to can carry the water of 19 insides of water tanks to the atomising head 6 inside, spout through atomizing mode, carry out the dust fall with the produced coal matrix granule dust of cutting piece 8 with this and handle, effectively ensure the operational environment of sample.
The working mode is as follows: firstly, the hard coal seam wall is cut by the cutting sampling mechanism, and simultaneously, the coal matrix particles generated by cutting can be transferred to the interior of the dust collecting disc cover 14 through the blanking groove 9, thereby collecting the coal matrix particles inside the sampling bottle 12 through the lower hopper 13 and the threaded pipe 11, thereby achieving the purpose of automatic sampling, the dust-removing blade 26 can rotate rapidly under the drive of the shaft sleeve 25, the wind pressure is generated to quickly introduce the coal matrix particles generated by the cutting into the dust collecting disc cover 14, therefore, the sampling efficiency of the sampling bottle 12 on the coal matrix particles is improved, and the arranged water pumping pipe 18, the miniature water pump 20 and the water conveying pipe 22 can convey the water in the water tank 19 to the inside of the spray head 6 and spray the water in an atomizing mode, therefore, dust falling treatment is carried out on the coal matrix particle dust generated by the cutting blade 8, and the working environment of sampling is effectively ensured.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides an automatic sampling equipment of colliery coal sample in pit, includes installation casing (1), handheld frame (3) are installed to the upper and lower both ends symmetry of installation casing (1), the inside of installation casing (1) clamps battery (2), the vertical mounting disc (4) that is connected with in front end of installation casing (1), the tip of mounting disc (4) is provided with cuts the sampling mechanism, its characterized in that, it includes motor (5) of fixed mounting at mounting disc (4) tip to cut the sampling mechanism, be connected through the wire between motor (5) and battery (2), the output shaft of motor (5) runs through mounting disc (4) and the fixed cover of tip has connect axle sleeve (25), the fixed cutting piece (8) that has cup jointed in the outside intermediate position of axle sleeve (25), the outside of cutting piece (8) is provided with collection dirt dish cover (14), collection dirt dish cover (14) are close to mounting disc (4) one end and have been seted up spout (27), axle sleeve (25) slip cartridge is inside spout (27), just be connected through slide mechanism between collection dirt dish cover (14) and the installation casing (1) hopper (13) down are installed in the bottom intercommunication of collection dirt dish cover (14), screwed pipe (11) are installed in the bottom intercommunication of hopper (13) down, sampling bottle (12) have been cup jointed to the outside screw thread of screwed pipe (11) the last lower extreme of collection dirt dish cover (14) port department all is provided with positioning mechanism.
2. The automatic sampling equipment of the coal mine underground coal sample according to claim 1, wherein a plurality of lower troughs (9) are formed at both ends of the cutting blade (8) at equal intervals along the circumferential direction, and the tooth grooves of the cutting blade (8) and the lower troughs (9) are arranged in an upwards inclined arc shape.
3. The automatic sampling equipment of colliery coal sample in pit of claim 1, characterized in that, the axle sleeve (25) outside at cutting piece (8) both ends all installs polylith along the circumferencial direction equidistance and drives dirt blade (26), drive dirt blade (26) all be the arc setting and with dust collection dish cover (14) inner wall between leave the clearance.
4. The automatic sampling equipment for the coal mine underground coal sample according to claim 1, wherein the sliding mechanism comprises a sliding sleeve (24) fixedly installed at the middle edge position of one end of the dust collecting disc cover (14) close to the installation shell (1), U-shaped rods (30) are horizontally inserted into the upper side and the lower side of the sliding sleeve (24) in a sliding manner, the two U-shaped rods (30) are installed on the outer surface of the installation shell (1) together, and a reset spring (17) is sleeved on the outer side of each U-shaped rod (30) at one end of the sliding sleeve (24) far away from the installation disc (4).
5. The automatic sampling equipment for the coal mine underground coal sample according to claim 1, wherein the positioning mechanism comprises a fixing block (23) vertically connected to the end part of the port of the dust collection disk cover (14), a T-shaped column (16) is horizontally slidably inserted in the middle of the fixing block (23), a positioning block (15) is fixedly installed at one end, away from the dust collection disk cover (14), of the T-shaped column (16), a buffer spring (10) is sleeved on the outer side of the T-shaped column (16) between the positioning block (15) and the fixing block (23), and a plurality of anti-skidding teeth (7) are arranged on the end face of one side, away from the T-shaped column (16), of the positioning block (15).
6. The automatic sampling equipment of colliery downhole coal appearance of claim 1, characterized in that, dust collection disk cover (14) port below inner wall both sides all fixed mounting have brush board (28), two brush board (28) are close to each other one side and all install brush pad (29), cutting piece (8) centre gripping is between two brush pads (29).
7. The automatic sampling equipment of colliery downhole coal appearance of claim 1, characterized in that, the top of collection dirt dish cover (14) is provided with dust fall mechanism, dust fall mechanism includes water tank (19) of installing casing (1) one end is kept away from to fixed mounting at collection dirt dish cover (14), the top of water tank (19) is provided with micro-pump (20) and water filling port (21) respectively, communicate through drinking-water pipe (18) between the inside bottom of drinking-water mouth of micro-pump (20) and water tank (19), atomising head (6) is installed through raceway (22) intercommunication to the delivery port of micro-pump (20), atomising head (6) slope is installed on collection dirt dish cover (14) top, just pass through the wire connection between micro-pump (20) and battery (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110438159.1A CN113295449A (en) | 2021-04-22 | 2021-04-22 | Automatic sampling equipment for underground coal sample of coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110438159.1A CN113295449A (en) | 2021-04-22 | 2021-04-22 | Automatic sampling equipment for underground coal sample of coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113295449A true CN113295449A (en) | 2021-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110438159.1A Pending CN113295449A (en) | 2021-04-22 | 2021-04-22 | Automatic sampling equipment for underground coal sample of coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113295449A (en) |
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| CN212432562U (en) * | 2020-07-16 | 2021-01-29 | 孙海波 | Building shear force wall major structure sampling device |
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2021
- 2021-04-22 CN CN202110438159.1A patent/CN113295449A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070096539A1 (en) * | 2005-11-01 | 2007-05-03 | Atlantic Concrete Cutting Inc. | Apparatus and method for cutting asphalt, concrete and other materials |
| US20110079207A1 (en) * | 2009-10-02 | 2011-04-07 | Paul Guth | Power saw apparatus with integrated dust collector |
| CN102431068A (en) * | 2011-10-27 | 2012-05-02 | 北京林业大学 | Pneumatic strengthening device for drum type chipping crusher |
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| CN208557172U (en) * | 2018-05-04 | 2019-03-01 | 万辉华 | A kind of hand-held dustless cutting machine |
| CN208614502U (en) * | 2018-08-06 | 2019-03-19 | 朱其刚 | Multi-purpose angle grinder |
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