CN103016001A - Impact crushing hammer of emulsified liquid - Google Patents
Impact crushing hammer of emulsified liquid Download PDFInfo
- Publication number
- CN103016001A CN103016001A CN2012105850319A CN201210585031A CN103016001A CN 103016001 A CN103016001 A CN 103016001A CN 2012105850319 A CN2012105850319 A CN 2012105850319A CN 201210585031 A CN201210585031 A CN 201210585031A CN 103016001 A CN103016001 A CN 103016001A
- Authority
- CN
- China
- Prior art keywords
- valve
- cylinder body
- impact
- hydraulic control
- way valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The invention relates to an impact crushing hammer of emulsified liquid. The impact crushing hammer consists of two parts including a crushing hammer body and a hydraulic control system, wherein the crushing hammer body comprises an upper cylinder body, an impact piston, a lower cylinder body, a drill rod; the impact piston is mounted in the upper cylinder body; the drill rod is mounted in the lower cylinder body and is sleeved with a reset spring; connecting lugs are arranged at the top of the upper cylinder body and the outer circumference surface of the lower cylinder body; the hydraulic control system is controlled by a two-position three-way change valve; an energy accumulator is communicated with a rodless cavity of the upper cylinder body through a plug-in valve A, and a plug-in valve B is connected with a rod cavity and the rodless cavity; and a one-way valve A, a one-way valve B and a hydraulic control one-way valve are opened in a charging process of the energy accumulator, the piston is closed in a striking process, and the plug-in valve A and the plug-in valve B are closed in the charging process and opened in the striking process, thereby forming a differential circuit. According to the impact crushing hammer of the emulsified liquid, the crushing hammer body is completely separated from the valves and the energy accumulator and is simple, light and convenient, all the valves are free from a slide valve structure and adopt valves for the emulsified liquid, the adaptability of media is high, and the impact crushing hammer of the emulsified liquid can be applied to crushing operation of big lump coal on the working faces of underground coal mines after being matched with a connecting mechanism.
Description
Technical field
The present invention relates to a kind of hydraulic shock quartering hammer, be particularly suitable for adopting the high water base mediums such as emulsion, be used for the crushing operation of coal mine fully-mechanized mining working bulk coal petrography.
Background technology
Hard above coal seam had the characteristics of compact structure mostly during hardness belonged to, and globality is strong.The increase that press with working thickness and ore deposit in this class coal seam, the working face wall wall caving is frequent, even can produce bulk in flakes, hinders passing through of coal-winning machine, can kill conveyer when serious; When coarse coal is pulled to coal circulation loading point through conveyer, can be stuck in elevating conveyor entrance or crushing engine feeding mouth place and can't continues to carry, and the coal stream of process is formed retardance, cause system-down.
At present, manually swing hammer or the processing of hand-held pneumatic pick for the main dependence of the processing of bulk, the amount of labour is large, poor stability.Patent " a kind of coal breaker for underground coal transfer conveyor " [201010225664.X] discloses on a kind of tup the slap type crushing engine with pick, solves the bulk crushing problem that arrives the elevating conveyor entrance; Patent " emulsion walking breaker " [201110071347.1] discloses a kind of work plane walking crushing engine, adopts squash type broken, only can process bulk in the crusher frame.Flexibility is relatively poor in actual applications for these existing machinery crushing mechanisms, and compliance is not strong, with sets of equipment in working face inconvenience.
The hydraulic breaking hammer of extensive use has volume compact on the engineering machinery, and the characteristics that specific power is large can be used for the crushing operation of bulk.But existing hydraulic breaking hammer adopts mineral oil as working media, and sealing, hammer body material and side valve type control valve structure be to high water base medium bad adaptability such as emulsions, as is directly used in the colliery downhole production and then needs special power source; In addition, existing hydraulic breaking hammer adopts high frequency underloading scheme, and potted component is required height, and the life-span is short; Accumulator, control valves etc. are integrated with hammer body, and weight is large, carrying and installation inconvenience, and also the accumulator volume that integral type is installed is little, the energy of single-impact little (piston upper and lower cavity significant surface product moment is little).Patent " detachable intelligent type hydraulic hammer " [200610040565.8] is separated controller and impactor, but accumulator and impactor still concentrate on one, jointly provides power by accumulator and pump; Still adopt slide-valve structure, be not suitable with high water base medium.
For addressing the above problem, light in the urgent need to a kind of structure, be convenient to the quartering hammer of installing at work plane; Device can utilize the work plane emulsion to do power source, the efficiency crushing coarse coal.
Summary of the invention
Technical problem: the present invention overcomes existing hydraulic breaking hammer to high water base medium bad adaptability, deficiency that weight is large, develops a kind of light, efficient emulsion impact grinding hammer, and the coarse coal that is used for coal mine work area is broken.
Technical scheme: a kind of emulsion impact grinding hammer comprises hammer body and hydraulic control system two parts.Hammer body is Split type structure, the lower cylinder body that comprises upper cylinder body, connects in the flange mode with upper cylinder body, is located at impact piston in the upper cylinder body, is located in the lower cylinder body and the coaxial mounted drill steel of impact piston; Described upper cylinder body top is provided with the engaging lug seat, and the cylinder body outer surface is provided with the snap joint that is communicated with the impact piston rod chamber near the position at top, and the upper cylinder body lower external face is provided with the snap joint that is communicated with the impact piston rodless cavity; The wear-resistant guiding cover supporting with drill steel arranged in the described lower cylinder body, be provided with lubricated duct in the fairlead; Described impact piston rod chamber and rodless cavity are equipped with the buffering step, adopt multiple-sealedly, and the co-axial seals that adapts to high water base, high speed axially-movable is selected in sealing; Described drill steel and piston contact jaw leave spring base, divide into spiral back-moving spring; Described lower cylinder body external surface is provided with the engaging lug seat.Described impact piston and upper cylinder body select stainless steel material or matching surface to adopt coating to process.
Hydraulic control system of the present invention comprises two position three way directional control valve, one way valve, hydraulic control one-way valve, accumulator, cartridge valve, overflow valve, stop valve etc.The pipeline of drawing from coal-face high-pressure emulsification pump station is connected to the reversal valve inlet, and the reversal valve working hole is leaded up to one way valve A and is connected to accumulator, and another road is connected to the impact piston rod chamber by one way valve B; Described accumulator outlet is equipped with stop valve, and accumulator is connected to the impact piston rodless cavity by cartridge valve A; Link to each other by cartridge valve B between rod chamber and rodless cavity; The rod chamber place is connected with work plane liquid back pipe road by hydraulic control one-way valve; Cartridge valve A, cartridge valve B are connected control port and all are connected with the reversal valve working hole with hydraulic control one-way valve; Connect overflow valve at working hole.Described valve member all is applicable to emulsion, can directly select existing fully-mechanized mining working support valve such as hydraulic control one-way valve, stop valve, overflow valve etc.
The present invention realizes impact and the homing action of quartering hammer piston by the operation of reversal valve.Topping up and reseting procedure: when the reversal valve working hole communicated with inlet, cartridge valve A control chamber led to high pressure liquid, and spool is closed, and accumulator is cut off to the path of hammer body rodless cavity, and high pressure liquid is opened one way valve A and entered accumulator, and accumulator is carried out topping up; Cartridge valve B control chamber leads to high pressure liquid, and spool is closed, impact piston rod chamber and rodless cavity isolation; Hydraulic control one-way valve control mouthful connection, hydraulic control one-way valve is opened, and the upper cylinder body rodless cavity leads to the liquid back pipe road, and this moment, impact piston resetted, and drill steel resets under spring-force driven dual.Impact process: when the reversal valve working hole was communicated with liquid return hole, pressure was laid down, and one way valve A closes under the energy storage pressure effect, cartridge valve A control chamber release of pressure, and spool is opened rapidly, and accumulator can enter the piston rodless cavity by liquid; One way valve B closes, and the hydraulic control one-way valve main valve plug is closed, cartridge valve B control chamber release of pressure, spool is opened, the liquid that rod chamber is discharged returns rodless cavity from cartridge valve B, forms differential connection, and impact piston drives drill steel and moves down fast impact coarse coal target under the effect of pressure differential.
Accumulator topping up and strike process are carried out repeatedly, and after impact was finished, tup was followed the tracks of by bindiny mechanism.Owing to adopt high-voltage high-speed to impact, add that coarse coal itself has certain bedding, can finish the fragmentation (whole lumpiness satisfies broken the conveying and requires to get final product, and need not be broken into many fritters) of bulk by time effect less.
Hydraulic system valve member of the present invention, accumulator etc. place on the force piece, and breaking hammer main body then places on the work plane by syndeton, and coarse coal is carried out fragmentation.
The present invention has following advantage: 1) hammer body structure is simple, light.Hammer body separates with accumulator, control valve etc., only needs two pipelines to be connected with hydraulic system.2) crushing efficiency is high.Utilize low frequency operation (Manual Mode), (at a high speed, high pressure) impacted in heavy duty, and Single-impact Energy is large, and the coarse coal crushing efficiency is high.Simultaneously, because the piston movement number of times reduces the application life that can improve seal.3) drill steel is changed easily.Adopt up and down cylinder split-type structural, be convenient to drill steel and change (need to according to different coal characteristics, change the drill steel of different types).4) drill steel Self-resetting.Piston adopts hydraulic reposition, and drill steel adopts spring reset (overcoming the drill steel deadweight), does not need special downforce.Larger initial velocity can be provided, and momentum is large.5) shock isolation.Only adopt accumulator as the dynamic impact problem source, avoided the pressure disturbance to the original hydraulic system of work plane.6) large flow, the fast impact.Work on hand face emulsifiable solution medium about 1000L/min, can't satisfy the above super-flow requirement of 2000L/min with valve flow maximum.Accumulator of the present invention and upper cylinder body rodless cavity adopt cartridge valve to connect between rodless cavity and the rod chamber, through-current capability is large, and differential connected mode has improved impact velocity.7) Adaptability of medium is strong.Design of Hydraulic System and the control valve of selecting are the element that adapts to high water base medium.
Description of drawings
Fig. 1 is hammer body structure figure of the present invention.
Fig. 2 is hydraulic control system schematic diagram of the present invention.
Among the figure: the 1-upper cylinder body; The 2-impact piston; The 3-lower cylinder body; The 4-drill steel; The 5-back-moving spring; 6,7-wear-resistant guiding cover; 8,11-seal; The 9-fairlead; 10,12-snap joint; 13,21-one way valve; The 14-pressure meter; The 15-accumulator; The 16-stop valve; 17,19-cartridge valve; The 18-hydraulic control one-way valve; The 20-hammer body; The 22-overflow valve; 23-two-bit triplet reversal valve.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described:
As shown in Figure 1, hammer body is comprised of upper cylinder body 1, lower cylinder body 3, impact piston 2, drill steel 4, back-moving spring 5.Upper cylinder body 1 and lower cylinder body 3 are connected by high-strength bolt by flange; Impact piston 2 is installed in the upper cylinder body, and it all leaves step at rod chamber and rodless cavity, as buffer plunger (being cone type structure shown in Fig. 1); Piston adopts the multiple tracks combination sealing, and the seal installed on the piston 10 encloses with lattice for piston, is installed in the interior seal of fairlead 98 and encloses with lattice for piston rod; Drill steel 4 is installed in the lower cylinder body 3 and is coaxial with impact piston 2, and drill steel 4 tops (with impact piston 2 contact jaws) is provided with step as the pedestal of back-moving spring 5, and the back-moving spring other end is being against on the wear-resistant guiding cover 7; Wear-resistant guiding cover 6 and 7 middle parts are several radial holes circumferentially, are connected with the duct of offering in the lower cylinder body; The top of upper cylinder body 1 is provided with engaging lug, and lower cylinder body 3 is welded with engaging lug near the circumferential surface of end; Upper cylinder body 1 is welded with snap joint 12 near the engaging lug external surface, and joint 12 communicates with impact piston 2 rodless cavities, is welded with snap joint 10 near the flange external surface, and joint 10 communicates with the impact piston rod chamber by the cannelure on the fairlead 9 and duct; Lower cylinder body 3 flange ends protrude step, offset with fairlead 9, bear the impact that piston transmits.
As shown in Figure 2, hydraulic system is comprised of two position three way directional control valve 23, overflow valve 22, one way valve 13, accumulator 15, cartridge valve 17, hydraulic control one-way valve 18, cartridge valve 19, one way valve 21.The P mouth of reversal valve 23 is connected with the highly pressurised liquid that draws from the work plane pumping plant, the R mouth is communicated with work plane emulsion liquid back pipe road, working hole A then respectively with overflow valve 22, one way valve 13(opening direction), cartridge valve 17 control chambers, hydraulic control one-way valve 18 controls mouthful, cartridge valve 19 control chambers are connected six arms and are connected with one way valve 21(opening direction; Import is connected with cartridge valve with accumulator 15 in one way valve 13 outlets, and the junction is provided with pressure meter 14, and the accumulator outlet is equipped with stop valve 16; Cartridge valve 17 outlets are connected with hammer body snap joint 12, cartridge valve 19 outlets and hydraulic control one-way valve 18; Snap joint 10 and cartridge valve 19 inlets on one way valve 21 outlets and the hammer body join.Described cartridge valve is that stainless steel is made, to the emulsion strong adaptability; One way valve and hydraulic control one-way valve are from force piece type selecting the valve.Described two position three way directional control valve can adopt the pilot operated directional control valve of electromagnetic priority valve control or hand-operated direction valve to operate two schemes, for the pilot operated directional control valve of electromagnetic priority valve control, can realize automatic control shown in Fig. 2.
The course of work of the present invention.
(1) accumulator topping up, impact piston reseting procedure:
(2) strike process:
Quartering hammer is adjusted to apart from the suitable distance of bulk target and attitude, two position three way directional control valve 23 is placed left position (position shown in Fig. 2), the logical liquid return hole R of A mouth this moment, discharge degree is fallen, and one way valve 13, one way valve 21 and hydraulic control one-way valve 18 are closed; Cartridge valve 17 and cartridge valve 19 control chamber releases, spool is opened; Formed " accumulator 15 → stop valve 16 → cartridge valve 17 → hammer body 20 rodless cavities; hammer body 20 rod chambers → cartridge valve 19 → hammer body 20 rodless cavities " differential circuit, because the rodless cavity area is large, impact piston 2 under pressure, promote rapidly drill steel 4 target assault targets, under momentum and pressure comprehensive function, that coarse coal is broken.
Claims (5)
1. an emulsion impact grinding is hammered into shape, and it comprises breaking hammer main body and hydraulic control system two parts:
Breaking hammer main body comprises upper cylinder body (1), impact piston (2), lower cylinder body (3), drill steel (4), back-moving spring (5), wear-resistant guiding cover (6,7); Hydraulic control system comprises two position three way directional control valve (23), one way valve (13,21), cartridge valve (17,19), hydraulic control one-way valve (18), accumulator (15); It is characterized in that:
Described breaking hammer main body upper cylinder body (1) and lower cylinder body (3) by flange by Bolt Connection; Impact piston (2) is located in the upper cylinder body (1), and drill steel (4) is installed in the lower cylinder body (3) and with impact piston (2) and keeps coaxial; Drill steel (4) leaves step with impact piston (2) contact jaw, and step is as an end group seat that is sleeved on the back-moving spring (5) on the drill steel (4), and back-moving spring (5) other end is pressed on the wear-resistant guiding cover (7); Wear-resistant guiding cover (6,7) is contained in the bottom of lower cylinder body (3), and it has the radially oiling hole link in duct and lower cylinder body (3);
Described hydraulic control system two position three way directional control valve (23) inlet (P) connects high-pressure emulsification pump station under the coal mine, liquid outlet (R) connects the emulsion liquid back pipe of pumping plant, and working hole (A) is connected in parallel with the control mouth of one way valve (13), one way valve (21), cartridge valve (17) control chamber, cartridge valve (19) control chamber, hydraulic control one-way valve (18); Accumulator (15) outlet connects one way valve (13) outlet, cartridge valve (17) inlet; The rodless cavity of upper cylinder body (1) is connected 17 with cartridge valve), the outlet of cartridge valve (19) and hydraulic control one-way valve (18) connect, rod chamber is connected 19 with cartridge valve) import, hydraulic control one-way valve (21) connect.
2. a kind of emulsion impact grinding according to claim 1 is hammered into shape, and it is characterized in that: accumulator in the described hydraulic control system (15) and all valve members all split with breaking hammer main body, and breaking hammer main body is connected two pipelines and connects with hydraulic control system.
3. a kind of emulsion impact grinding according to claim 1 is hammered into shape, and it is characterized in that: described impact piston (2) rod chamber and rodless cavity two ends are equipped with the buffering step.
4. a kind of emulsion impact grinding according to claim 1 is hammered into shape, and it is characterized in that: described upper cylinder body (1) top is provided with engaging lug, and lower cylinder body (3) is welded with engaging lug near the end external peripheral surface.
5. a kind of emulsion impact grinding hammer according to claim 1 is characterized in that: two position three way directional control valve (23) during for hand-operated direction valve working method be crawl control, working method can be automatic control during for the pilot operated directional control valve of electromagnetic priority valve control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105850319A CN103016001A (en) | 2012-12-31 | 2012-12-31 | Impact crushing hammer of emulsified liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105850319A CN103016001A (en) | 2012-12-31 | 2012-12-31 | Impact crushing hammer of emulsified liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103016001A true CN103016001A (en) | 2013-04-03 |
Family
ID=47965045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105850319A Pending CN103016001A (en) | 2012-12-31 | 2012-12-31 | Impact crushing hammer of emulsified liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103016001A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527190A (en) * | 2013-10-28 | 2014-01-22 | 天地科技股份有限公司 | Impact crushing device in tail beam of top coal caving hydraulic support |
| WO2018040457A1 (en) * | 2016-09-05 | 2018-03-08 | 李仕清 | Pick having power device of composite rotary cutting excavating machine |
| CN112267505A (en) * | 2020-11-11 | 2021-01-26 | 北京三一智造科技有限公司 | Continuous wall grab bucket device and control method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2383958Y (en) * | 1999-07-24 | 2000-06-21 | 中南工业大学 | Hydraulic impactor |
| RU2184847C1 (en) * | 2000-11-23 | 2002-07-10 | Попов Юрий Алексеевич | Hydraulic percussion device |
| CN101077575A (en) * | 2006-05-25 | 2007-11-28 | 马鞍山市惊天液压机械制造有限公司 | Split type intelligent type hydraulic hammer |
| CN201206338Y (en) * | 2008-02-19 | 2009-03-11 | 张春生 | Novel breaker host |
| CN101890384A (en) * | 2010-07-09 | 2010-11-24 | 太原理工大学 | Coal breaker for underground coal transfer conveyor |
| CN201874570U (en) * | 2010-12-06 | 2011-06-22 | 上海工程技术大学 | Hydraulic breaking hammer |
| CN102205260A (en) * | 2011-03-24 | 2011-10-05 | 焦作煤业（集团）新乡能源有限公司 | Emulsion traveling crusher |
| CN102312457A (en) * | 2011-07-12 | 2012-01-11 | 安徽惊天液压智控股份有限公司 | Pressure-feedback-type hydraulic impactor |
| RU2456424C1 (en) * | 2010-12-07 | 2012-07-20 | Государственное образовательное учреждение высшего профессионального образования "Орловский государственный технический университет" (ОрелГТУ) | Hydraulic impact device |
| KR20120130947A (en) * | 2011-05-24 | 2012-12-04 | 대모 엔지니어링 주식회사 | Hydraulic breaker with low noise and vibration structure |
-
2012
- 2012-12-31 CN CN2012105850319A patent/CN103016001A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2383958Y (en) * | 1999-07-24 | 2000-06-21 | 中南工业大学 | Hydraulic impactor |
| RU2184847C1 (en) * | 2000-11-23 | 2002-07-10 | Попов Юрий Алексеевич | Hydraulic percussion device |
| CN101077575A (en) * | 2006-05-25 | 2007-11-28 | 马鞍山市惊天液压机械制造有限公司 | Split type intelligent type hydraulic hammer |
| CN201206338Y (en) * | 2008-02-19 | 2009-03-11 | 张春生 | Novel breaker host |
| CN101890384A (en) * | 2010-07-09 | 2010-11-24 | 太原理工大学 | Coal breaker for underground coal transfer conveyor |
| CN201874570U (en) * | 2010-12-06 | 2011-06-22 | 上海工程技术大学 | Hydraulic breaking hammer |
| RU2456424C1 (en) * | 2010-12-07 | 2012-07-20 | Государственное образовательное учреждение высшего профессионального образования "Орловский государственный технический университет" (ОрелГТУ) | Hydraulic impact device |
| CN102205260A (en) * | 2011-03-24 | 2011-10-05 | 焦作煤业（集团）新乡能源有限公司 | Emulsion traveling crusher |
| KR20120130947A (en) * | 2011-05-24 | 2012-12-04 | 대모 엔지니어링 주식회사 | Hydraulic breaker with low noise and vibration structure |
| CN102312457A (en) * | 2011-07-12 | 2012-01-11 | 安徽惊天液压智控股份有限公司 | Pressure-feedback-type hydraulic impactor |
Non-Patent Citations (1)
| Title |
|---|
| 李军霞等: "基于大煤块的液压冲击破碎装置特性研究", 《煤炭学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527190A (en) * | 2013-10-28 | 2014-01-22 | 天地科技股份有限公司 | Impact crushing device in tail beam of top coal caving hydraulic support |
| WO2018040457A1 (en) * | 2016-09-05 | 2018-03-08 | 李仕清 | Pick having power device of composite rotary cutting excavating machine |
| CN112267505A (en) * | 2020-11-11 | 2021-01-26 | 北京三一智造科技有限公司 | Continuous wall grab bucket device and control method thereof |
| CN112267505B (en) * | 2020-11-11 | 2024-05-14 | 北京三一智造科技有限公司 | Continuous wall grab bucket device and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103016001A (en) | Impact crushing hammer of emulsified liquid | |
| CN107435519A (en) | Low discharge creeps into high flow capacity seam cutting drill bit | |
| CN203431500U (en) | Internal pressurization pipeline | |
| CN105014052A (en) | Casting head removing hammer | |
| CN2892320Y (en) | Hydraulic electric liquid hammer | |
| CN202379308U (en) | Separated-type silo wall vibrating air hammer | |
| CN202440128U (en) | Waste filling pneumatic conveying system | |
| CN103643894A (en) | Crawler-type hydraulic cutting drilling machine of large-air-volume air compressor system | |
| CN2931965Y (en) | Pneumatically operated sliding valve type scaling valve by high pressure water | |
| CN201695430U (en) | Frozen soil crusher head | |
| CN106969160B (en) | A kind of oscillatory valve | |
| US9724813B2 (en) | Device for rock and-concrete machining | |
| CN102434682A (en) | Slide valve | |
| CN204802414U (en) | High -efficient disk feeder | |
| CS249514B2 (en) | Method of materials' disintegration and/or breaking especially for coal seams and equipment for application of this method | |
| CN204754896U (en) | A pneumatic defeated sand sled for fracturing | |
| CN210160804U (en) | Automatic feeding device for water plugging hole processing of engine cylinder cover | |
| CN208565572U (en) | Pneumatic sand valve and its application apparatus | |
| KR101575059B1 (en) | Spring and compressed gas type breaker | |
| CN202266410U (en) | Sliding valve | |
| CN202481602U (en) | Equipment for clearing away blocked bridging of ore storage bin | |
| CN201049822Y (en) | Air artillery | |
| CN203044062U (en) | Safe pneumatic breaker | |
| CN200986106Y (en) | Underground material conveying device | |
| CN211774022U (en) | Hydraulic mountain digging hammer and hydraulic system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130403 |