CN108691543A - A kind of cutting inner sprayer unit of continuous miner - Google Patents

A kind of cutting inner sprayer unit of continuous miner Download PDF

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Publication number
CN108691543A
CN108691543A CN201810768229.8A CN201810768229A CN108691543A CN 108691543 A CN108691543 A CN 108691543A CN 201810768229 A CN201810768229 A CN 201810768229A CN 108691543 A CN108691543 A CN 108691543A
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China
Prior art keywords
cutting
water
nozzle
drum
cutting drum
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Granted
Application number
CN201810768229.8A
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Chinese (zh)
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CN108691543B (en
Inventor
张小峰
宋明江
郭进彬
张强
郑吉�
丁永成
马凯
李永安
陈庆贺
任晓力
张学瑞
梁大海
慕伟
贺克伟
马钊宁
林广旭
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Taiyuan Institute of China Coal Technology and Engineering Group
Shanxi Tiandi Coal Mining Machinery Co Ltd
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Taiyuan Institute of China Coal Technology and Engineering Group
Shanxi Tiandi Coal Mining Machinery Co Ltd
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Application filed by Taiyuan Institute of China Coal Technology and Engineering Group, Shanxi Tiandi Coal Mining Machinery Co Ltd filed Critical Taiyuan Institute of China Coal Technology and Engineering Group
Priority to CN201810768229.8A priority Critical patent/CN108691543B/en
Publication of CN108691543A publication Critical patent/CN108691543A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C35/00Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/22Equipment for preventing the formation of, or for removal of, dust
    • E21C35/23Distribution of spraying-fluids in rotating cutter-heads

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Abstract

The invention belongs to the technical fields that continuous miner is constituted, and the cutting inner sprayer unit of specifically a kind of continuous miner, continuous miner includes cutting reducer and cutting drum;The cutting inner sprayer unit include be arranged on cutting reducer cross liquid disk for realizing the fan-shaped of fan-shaped water distribution, be arranged on cutting drum and cross the water dispensing apparatus and several nozzles for spraying being arranged on cutting drum that liquid disk connects with fan-shaped;The cutting reducer is externally provided with shell, the cutting drum can relative sector cross the rotation of liquid disk, the runner for connecting water dispensing apparatus and nozzle is equipped in the cutting drum;Cooling spray water is introduced via the shell, enters the runner inside cutting drum after sector crosses liquid disk water distribution, then via water dispensing apparatus, is eventually flowed to corresponding nozzle and is sprayed.The device is easy for installation, and sealed reliable, service life is long, can effectively inhibit to dig mining face dust, realizes pick cooling, reduces pick consumption and cutting is avoided to generate spark.

Description

A kind of cutting inner sprayer unit of continuous miner
Technical field
The invention belongs to the technical fields that continuous miner is constituted, and are related to a kind of cutting internal spraying dress of continuous miner It sets.
Background technology
Continuous miner be widely used in coal mine down-hole tunnel driving and corner coal, " under three " coal, irregular block and It is not suitable in the exploitation of coal resources of fully-mechanized mining working exploitation, and cutting inner sprayer unit refers in the continuous miner course of work Via cutting units inner flow passage, the nozzle atomization arranged from the cutting drum of rotation sprays cooling water, is sprayed directly on pick Around, have the effects that inhibit dust, cooling pick, reduce pick consumption and cutting spark is avoided to generate.However, due to The reasons such as basic theories, technical foundation and reliability, internal spraying is not configured in domestic introduction and domestic continuous miner at present System.
For this purpose, domestic more coal machine and manufactures quotient carried out the development of Vertical Axis Road-header and fully mechanized mining coalcutter internal spraying, but Using effect is poor, is in particular in the following aspects:(1)Since existing development machine internal spraying water channel is via in retarder Portion once seal failure easily causes retarder internal gear oil to emulsify, and then causes retarder significant trouble;(2)Water-stop Short life, difficult in maintenance, for existing internal spraying water-stop directly with the positive press contacts of water axis excessively, running resistance is big, and attrition is fast, puts down Equal service life was less than 3 months;(3)Since water-stop is arranged in inside retarder, when replacement, needs to dismantle roller, opens and slows down Device babinet is safeguarded extremely inconvenient;(4)Coal petrography cutting and cylinder cycle coal easily cause spray nozzle clogging, nozzle exchange tired in use It is difficult.
Invention content
The purpose of the present invention is to solve above-mentioned technical problems, provide a kind of cutting internal spraying dress of continuous miner Set, the device is easy for installation, and sealed reliable, service life is long, can effectively inhibit dig mining face dust, realize pick cooling, It reduces pick consumption and cutting is avoided to generate spark.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of cutting inner sprayer unit of continuous miner, the continuous miner include cutting reducer and cutting drum;Institute It includes that the sector for realizing fan-shaped water distribution being arranged on cutting reducer crosses liquid disk to state cutting inner sprayer unit, and setting is being cut It cuts on roller and crosses the water dispensing apparatus and several nozzles for spraying being arranged on cutting drum that liquid disk connects with fan-shaped; The cutting reducer is externally provided with shell, the cutting drum can relative sector cross the rotation of liquid disk, be equipped in the cutting drum Runner for connecting water dispensing apparatus and nozzle;Cooling spray water is introduced via the shell, after sector crosses liquid disk water distribution, then Enter the runner inside cutting drum via water dispensing apparatus, eventually flows to corresponding nozzle and spray.
Specifically, fan-shaped cross between liquid disk and cutting reducer was equipped with liquid set, and sector crosses liquid disk and cutting The shell of retarder is connected, which, which crosses on liquid disk, is distributed with sluice and fan-shaped water distributing trough;Cooling spray water is introduced from shell, Then pass through liquid set inflow sector and cross liquid disk, using water channel and fan-shaped water distributing trough realization fan-shaped water distribution.
Preferably, the central angle of the fan-shaped water distributing trough is 210 °.
Preferably, the water dispensing apparatus is connect by crossing liquid guide with cutting drum thread seal.
Scheme as a further preference is symmetrically distributed with rotation water-stop and balancing slit on the water dispensing apparatus, described Balancing slit is symmetrically distributed on the inside of rotation water-stop, to play the role of liquid-bearing.
Preferably, the water dispensing apparatus is made by antiwear Cu-base material.
Scheme as a further preference, several runners are along the cylinder directional spreding of cutting drum, the nozzle Then it is distributed on outside cutting drum;Several and one-to-one water-carrying groove of nozzle, runner is distributed in the cutting drum circumferencial direction It is connected respectively with corresponding nozzle by water-carrying groove.
In addition, several runners are along the cylinder directional spreding of cutting drum, the nozzle is then distributed on cutting drum Outside;Several and one-to-one water-carrying groove of nozzle is distributed in the cutting drum circumferencial direction, also is provided with along drum surface several With the one-to-one roller water channel of nozzle, runner then passes sequentially through water-carrying groove, roller water channel is connected with corresponding nozzle.
Further, the nozzle is externally provided with the nozzle shroud for preventing nozzle from being squeezed and being blocked by cutting coal, institute It states nozzle shroud one end to be then set as being open, spray so that nozzle can be sprayed from this end, the nozzle shroud other end is arranged around nozzle, And this end of nozzle shroud is hemisphere face structure, can be fixed along cutting drum drum surface any direction, to realize nozzle injection side To the pick crown of face cutting drum.
Compared with prior art, the invention has the advantages that:
(1)In the present invention, cooling spray water without cutting reducer inside, it is cooling in this way after rotation water-stop failure Spray water greatly reduces loss there is no the risk inside intrusion retarder.
(2)Fan-shaped spraying, i.e., the only current pick respective nozzle for participating in work are realized in the cutting spraying of the present invention It can just spray to it, and inoperative tooth is not sprayed then, has been reached energy-saving and has been avoided occluded water that roadway floor is caused to soften Purpose.
(3)Water dispensing apparatus of the present invention selects antiwear Cu-base material to make, and damage sector when seal failure is avoided to cross liquid disk, On be symmetrically distributed with rotation water-stop and balancing slit, balancing slit is symmetrically distributed on the inside of water-stop, plays the role of liquid-bearing, subtract Small sealing running resistance seals the adaptability of impact loading when enhancing cutting.
(4)Fan-shaped liquid panel surface of crossing of the invention applies technical finesse of making pottery by extraordinary, enhances wearability and has antirust work( Can, seal friction resistance is further decreased, sealing service life is extended.
(5)The water-stop of the present invention uses combined labyrinth and carbon gland, has the function of wear-self-compensation, material itself have both it is wear-resisting with Self-lubricating property further ensures the reliability and service life of sealing.
(6)The nozzle of the present invention is fixed in nozzle shroud, and nozzle shroud can effectively protect nozzle prevents it by cutting coal It squeezes and blocks;Nozzle shroud bottom is spherical structure, can be fixed along cylindrical roller body surface face any direction, realizes nozzle injection Direction face pick crown, is effectively ensured spray effect.
Description of the drawings
Fig. 1 is schematic diagram of the present invention in continuous miner.
Fig. 2 is the structural schematic diagram of the present invention.
Fig. 3 is reducer shell runner distribution map of the present invention.
Fig. 4 is water dispensing apparatus structural schematic diagram of the present invention.
Fig. 5 is the sectional view that the present invention crosses liquid guide.
Fig. 6, which is that the present invention is fan-shaped, crosses liquid dish structure schematic diagram.
Fig. 7 is B-B sectional views.
Fig. 8 is roller water channel distribution map.
Wherein, reference numeral is corresponding entitled:
1- cutting reducers shell, 2- cross liquid set, 3- sectors cross liquid disk, the water routes 4- component, 5- water dispensing apparatus, 6- cross liquid guide, 7- cutting drums, 8- rollers water channel, 9- nozzle shrouds, 10- nozzles, 11- picks, 5-1- rotations water-stop, 5-2- balancing slits.
Specific implementation mode
The invention will be further described with embodiment for explanation below in conjunction with the accompanying drawings, and mode of the invention includes but not only limits In following embodiment.
The purpose of the present embodiment is to provide for a kind of cutting inner sprayer unit applied to continuous miner, existing overcoming While having development machine and coalcutter class inner sprayer unit technical disadvantages, the inner sprayer unit being used on continuous miner is reliable Property and service life are improved.The device may be used on development machine and coalcutter class product, by taking continuous miner as an example, Continuous miner where the device includes cutting reducer and cutting drum(Its connection relation, coalcutter other component and Connection is usual manner, and since it is unrelated with the improvement of the present embodiment, this will not be repeated here), and the present embodiment institute Cutting inner sprayer unit is stated to be arranged on cutting reducer and cutting drum, since cutting reducer shell is symmetrical, roller Also symmetrical, it is made of respectively left and right roller and intermediate calender rolls, since spraying principle is identical, in order to avoid repeated explanation, originally It is described in detail by taking the spraying of right roller as an example in embodiment.
Specifically, as depicted in figs. 1 and 2, cutting inner sprayer unit described in the present embodiment includes water dispensing apparatus 5, sector Cross liquid disk 3, nozzle 10 and nozzle shroud 9 etc..
As shown in figure 3, the cutting reducer is externally provided with shell 1, water route component is equipped between shell and cutting reducer 4, which includes water supply hose and waterway channel, and water supply hose is arranged on shell, and its waterway channel then may be used To be arranged waterway pipe between shell and cutting reducer, or with the gap between shell and cutting reducer it is directly logical Road, by water for pipeline, cooling spray water transmits the present embodiment by waterway pipe, and without cutting reducer inside, Even after rotation water-stop failure, the risk inside intrusion retarder is also not present in cooling spray water, can effectively reduce damage It loses.
As shown in Figure 6 and Figure 7, the sector crosses sluice and the sector being distributed on liquid disk 3 for realizing fan-shaped water distribution Water distributing trough, it is described it is fan-shaped cross liquid disk 3 and the shell 1 of cutting reducer is connected, and it is fan-shaped cross 3 lower section of liquid disk by cross liquid set 2 with Cutting reducer 1 is connected, and the side for crossing liquid set 2 is then connected with waterway pipe in shell, and the water in waterway pipe is introduced Sector is crossed 3 in liquid disk.Cooling spray water is introduced from water supply hose in shell after waterway pipe, and covering inflow sector by liquid crosses liquid Disk realizes fan-shaped water distribution using water channel and fan-shaped water distributing trough;It realizes and saves industrial water and occluded water is avoided to cause tunnel Bottom plate ruckbildung.In addition, fan-shaped 3 surface of liquid disk of crossing applies technical finesse of making pottery by extraordinary, enhance surface abrasion resistance and Rustless property substantially reduces sealing running resistance, extends service life of seal.Wherein, the center of circle of the fan-shaped water distributing trough Angle is 210 °, and cross liquid disk 3 due to sector is connected with cutting reducer shell 1, and cutting drum 7 is with certain rotating speed relative to sector The rotation of liquid disk 3 is crossed, therefore, the pick in 7 rotary course of cutting drum in the fan-shaped range of 210 ° of cylinder surface just has phase Nozzle is answered to spray it, i.e., the only current pick respective nozzle for participating in work can just spray to it, and inoperative Tooth is not sprayed then.
As shown in Figure 4 and Figure 5, the cutting drum 7 and sector can be with relative rotation between crossing liquid disk 3, and the two is logical Water dispensing apparatus connection is crossed, the water dispensing apparatus 5 is connect by crossing liquid guide 6 with cutting drum thread seal, is convenient for water dispensing apparatus Demolition and maintenance.The water dispensing apparatus 5 is made by antiwear Cu-base material, and damage sector when seal failure is avoided to cross liquid disk, water distribution Be symmetrically distributed on device rotation water-stop 5-1 and balancing slit 5-2, the balancing slit be symmetrically distributed in rotation water-stop on the inside of, To play the role of liquid-bearing, water dispensing apparatus with Auxiliary support, reduces rotatory sealing running resistance, buffering cutting is impacted, Play the role of seal protection;The rotation water-stop seals for a kind of Assembled rotary, has both self-lubricating and antiwear characteristic, should Device can effectively improve sealing system reliability and prolong the service life.
As shown in figure 8, the nozzle 10 has cutting drums that are several, and being separately positioned on 11 crown corresponding position of pick On, it is all provided with that there are one the nozzle shroud 9 for preventing nozzle from being squeezed and being blocked by cutting coal, the sprays outside each nozzle 10 Mouth shield one end is then set as being open, and sprays so that nozzle can be sprayed from this end, the nozzle shroud other end is arranged around nozzle(It can be straight It connects and is threadedly coupled with nozzlend), and this end of nozzle shroud is hemisphere face structure, it can be arbitrarily square along 7 drum surface of cutting drum To fixation, 11 crown of pick of nozzle spray direction face cutting drum easily can be realized.
The runner for connecting water dispensing apparatus and nozzle is equipped in the cutting drum, cooling spray water draws via the shell Enter, enters the runner inside cutting drum after sector crosses liquid disk water distribution, then via water dispensing apparatus, eventually flow to corresponding spray Mouth sprays.Along the cylinder directional spreding of cutting drum, the nozzle is then distributed on outside cutting drum the runner;The cutting Roll circumference directional spreding has several and one-to-one water-carrying groove of nozzle, runner to pass through water-carrying groove and corresponding nozzle respectively 10 are connected.And when the position of nozzle with water-carrying groove is not corresponding or be not easy to it is corresponding when can on the basis of water-carrying groove is set, It also is provided with several and one-to-one roller water channel 8 of nozzle along drum surface, its runner is made to pass sequentially through water-carrying groove, roller water channel It is connected with corresponding nozzle 10.
In the present embodiment, crosses liquid set 2, crosses liquid guide 6(Guide structure as shown in Figure 5 can also be used), rotation water-stop 5-1 This field conventional components can be selected by its function Deng the parts not being construed as limiting.
When work, after cooling spray water enters cutting reducer shell 1 by water supply hose, enter after crossing liquid set 2 Sector crosses liquid disk 3;Spray water is distributed in 210 ° of fan-shaped water distributing trough after sluice outflow in sector liquid disk 3, then passes through Enter cutting drum 7 after crossing liquid guide 6 and water dispensing apparatus 5;Spray water enters after cutting drum 7 through drums inside runner and final It is sprayed after reaching nozzle 10, to realize cutting depositing dust and the cooling of pick 11 and the generation for inhibiting pick cutting spark.
In the cutting inner sprayer unit of the present embodiment, spray water is reduced and is lost by sealing not via cutting reducer inside It imitates and causes the risk inside spray water intrusion cutting reducer;Water dispensing apparatus is connect by crossing liquid guide with cutting drum, just In demolition and maintenance;Water dispensing apparatus is equipped with new material rotation water-stop and balancing slit, improves the reliability and watertight of spraying system The service life of envelope;Fan-shaped spraying is realized in spraying, avoids roadway floor ruckbildung on the basis of improving dust removing effects, most It realizes eventually energy-saving.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit the protection model of the present invention Enclose, as long as the present invention body design thought and that mentally makes have no the change of essential meaning or polishing, solved The technical issues of it is still consistent with the present invention, should all be included within protection scope of the present invention.

Claims (9)

1. a kind of cutting inner sprayer unit of continuous miner, the continuous miner includes cutting reducer and cutting drum; It is characterized in that, the cutting inner sprayer unit includes the fan-shaped mistake for realizing fan-shaped water distribution being arranged on cutting reducer Liquid disk(3), it is arranged on cutting drum and crosses the water dispensing apparatus that liquid disk connects with sector(5)And several settings are in cutting drum On for spraying nozzle(10);The cutting reducer is externally provided with shell(1), the cutting drum can relative sector cross liquid Disk rotates, and the runner for connecting water dispensing apparatus and nozzle is equipped in the cutting drum;Cooling spray water draws via the shell Enter, enters the runner inside cutting drum after sector crosses liquid disk water distribution, then via water dispensing apparatus, eventually flow to corresponding spray Mouth sprays.
2. a kind of cutting inner sprayer unit of continuous miner according to claim 1, which is characterized in that the sector mistake Liquid disk(3)With cutting reducer(1)Between be equipped with for feed liquor cross liquid set(2), and sector liquid disk and cutting reducer excessively Shell(1)It is connected, which, which crosses on liquid disk, is distributed with sluice and fan-shaped water distributing trough;Cooling spray water is introduced from shell, then Inflow sector is covered by liquid and crosses liquid disk, using water channel and fan-shaped water distributing trough realization fan-shaped water distribution.
3. a kind of cutting inner sprayer unit of continuous miner according to claim 2, which is characterized in that the sector is matched The central angle of sink is 210 °.
4. a kind of cutting inner sprayer unit of continuous miner according to claim 1 ~ 3 any one, which is characterized in that The water dispensing apparatus(5)By crossing liquid guide(6)It is connect with cutting drum thread seal.
5. a kind of cutting inner sprayer unit of continuous miner according to claim 4, which is characterized in that the water distribution dress It sets(5)On be symmetrically distributed with rotation water-stop(5-1)And balancing slit(5-2), the balancing slit is symmetrically distributed in rotation water-stop Inside, to play the role of liquid-bearing.
6. a kind of cutting inner sprayer unit of continuous miner according to claim 5, which is characterized in that the water distribution dress It sets(5)It is made by antiwear Cu-base material.
7. a kind of cutting inner sprayer unit of continuous miner according to claim 6, which is characterized in that several streams Along the cylinder directional spreding of cutting drum, the nozzle is then distributed on outside cutting drum in road;The cutting drum circumferencial direction Several and one-to-one water-carrying groove of nozzle is distributed with, runner passes through water-carrying groove and corresponding nozzle respectively(10)It is connected.
8. a kind of cutting inner sprayer unit of continuous miner according to claim 6, which is characterized in that several streams Along the cylinder directional spreding of cutting drum, the nozzle is then distributed on outside cutting drum in road;The cutting drum circumferencial direction Several and one-to-one water-carrying groove of nozzle is distributed with, several and one-to-one roller water channel of nozzle also is provided with along drum surface (8), runner then passes sequentially through water-carrying groove, roller water channel and corresponding nozzle(10)It is connected.
9. a kind of cutting inner sprayer unit of continuous miner according to claim 7 or 8, which is characterized in that the spray Mouth(10)It is externally provided with the nozzle shroud for preventing nozzle from being squeezed and being blocked by cutting coal(9), described nozzle shroud one end is then set It for opening, sprays so that nozzle can be sprayed from this end, the nozzle shroud other end is arranged around nozzle, and this end of nozzle shroud is half Spherical structure, can be along cutting drum(7)Drum surface any direction is fixed, to realize nozzle spray direction face cutting drum Pick(11)Crown.
CN201810768229.8A 2018-07-13 2018-07-13 Cutting inner spraying device of continuous miner Active CN108691543B (en)

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CN108691543B CN108691543B (en) 2020-07-03

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109779629A (en) * 2019-01-28 2019-05-21 黄山市徽州安华工程机械有限公司 Atomizing de-dusting cutterhead
CN109812266A (en) * 2019-01-30 2019-05-28 河北工程大学 A kind of inner spraying device for coal cutter
CN109915136A (en) * 2019-04-10 2019-06-21 佳木斯智研矿山机械有限公司 Cutting inner sprayer unit and winning machine cutting part
CN110173262A (en) * 2019-06-27 2019-08-27 天地科技股份有限公司上海分公司 Cutting units dust suppression structure

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Publication number Priority date Publication date Assignee Title
GB2164680B (en) * 1984-09-22 1987-09-30 Eickhoff Geb Improvements relating to drum shearer-loaded machines
CN201144700Y (en) * 2007-12-19 2008-11-05 三一重型装备有限公司 Inner-water-spraying system for coal mine fully-mechanized face coal cutter
WO2011014217A1 (en) * 2009-07-29 2011-02-03 George Albert Parrott Cutting tool with nozzle for spraying water on a cutter bit
CN202578696U (en) * 2012-04-16 2012-12-05 三一重型装备有限公司 Rocker arm inner spraying device of coal mining machine and coal mining machine
CN103147752A (en) * 2013-03-28 2013-06-12 山西潞安矿业(集团)有限责任公司 Water distribution device of cutting motor suspension arm section
CN203499690U (en) * 2013-09-26 2014-03-26 安徽省博达矿山机械有限公司 Spraying device in coal cutter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164680B (en) * 1984-09-22 1987-09-30 Eickhoff Geb Improvements relating to drum shearer-loaded machines
CN201144700Y (en) * 2007-12-19 2008-11-05 三一重型装备有限公司 Inner-water-spraying system for coal mine fully-mechanized face coal cutter
WO2011014217A1 (en) * 2009-07-29 2011-02-03 George Albert Parrott Cutting tool with nozzle for spraying water on a cutter bit
CN202578696U (en) * 2012-04-16 2012-12-05 三一重型装备有限公司 Rocker arm inner spraying device of coal mining machine and coal mining machine
CN103147752A (en) * 2013-03-28 2013-06-12 山西潞安矿业(集团)有限责任公司 Water distribution device of cutting motor suspension arm section
CN203499690U (en) * 2013-09-26 2014-03-26 安徽省博达矿山机械有限公司 Spraying device in coal cutter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109779629A (en) * 2019-01-28 2019-05-21 黄山市徽州安华工程机械有限公司 Atomizing de-dusting cutterhead
CN109779629B (en) * 2019-01-28 2024-04-16 黄山市徽州安华工程机械有限公司 Spray dust-fall cutting head
CN109812266A (en) * 2019-01-30 2019-05-28 河北工程大学 A kind of inner spraying device for coal cutter
CN109812266B (en) * 2019-01-30 2024-06-04 河北工程大学 Spraying device in coal mining machine
CN109915136A (en) * 2019-04-10 2019-06-21 佳木斯智研矿山机械有限公司 Cutting inner sprayer unit and winning machine cutting part
CN110173262A (en) * 2019-06-27 2019-08-27 天地科技股份有限公司上海分公司 Cutting units dust suppression structure

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