AU2003271396B2 - A sub-level caving hydraulic support - Google Patents
A sub-level caving hydraulic support Download PDFInfo
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- AU2003271396B2 AU2003271396B2 AU2003271396A AU2003271396A AU2003271396B2 AU 2003271396 B2 AU2003271396 B2 AU 2003271396B2 AU 2003271396 A AU2003271396 A AU 2003271396A AU 2003271396 A AU2003271396 A AU 2003271396A AU 2003271396 B2 AU2003271396 B2 AU 2003271396B2
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- canopy
- debris shield
- hinged
- hydraulic support
- sub level
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- Lining And Supports For Tunnels (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Description
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S):: Yankuang Group Corporation ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Nicholson Street,Melboume, 3000, Australia INVENTION TITLE: A sub-level caving hydraulic support The following statement is a full description of this invention, including the best method of performing it known to me/us:- The present invention relates to a support shield equipment used in working face and stope of underground coal mine, and especially relates to a sub level caving hydraulic support with a low positioned door for passing caved coal, which is suitable for mining a coal seam over 5m with a good capability of a top coal.
In the past, a double leg debris shield high level caving hydraulic support has been used. This support is a short top canopy, single hinge point, single conveyer caving support with balance mechanism, wherein two legs are supported on a debris shield canopy, having an upper opening. It is an earliest caving support and has been eliminated due to a plurality of shortage.
At present when a sub level caving mining system is used in coal working face, all hydraulic supports are four legs debris shield support.
In accordance with the form of balance mechanism they can be divided into: Sub level caving hydraulic support with normal four connect bars and four legs; Sub level caving hydraulic support with reverse four connect bars and four legs; Single pendulum or single hinge point sub level caving hydraulic support with four connect bars.
In Chinese ((Patent gazette for invention) Vol.17, No. 2, a patent entitled sub level caving hydraulic support)) was disclosed with a patent number of ZL 99112531.2 and publication number of CN 1296115A.
Examples of the invention seek to provide a sub level hydraulic support, which can keep enough space for passing caved coal at a rear portion of the support and facilitate the operation at a front portion of the support, as well as enhance stress condition of four connect bar mechanism.
Its construction including a base and a top canopy, each having a forward end portion and a rearward end portion, forward and rearward pairs of hydraulic legs operationally interconnecting the base and top canopy, said forward legs being laterally spaced apart from one another and disposed toward the forward end portions of said base and top canopy and said rearward legs being laterally spaced apart and disposed toward the rearward end portions of the base and top canopy; a debris shield canopy pivotally connected to the rearward end portion of top canopy, a tail canopy pivotally connected to the debris shield canopy, a retractable plate operatively connected to the tail canopy for movement relative thereto between an extended position and a retracted position, a drive cylinder for causing said movement of said retractable plate, front and rear bar link means pivotally connected to rearward end portion of the base and the debris shield canopy, said front bar link means including two bars each disposed behind a respective one of said rearward legs.
Its construction including legs, a base, hinged with both ends of legs, a top canopy having front canopy, a debris shield canopy successively hanged with rear portion of top canopy, a tail canopy, controlled by tail canopy cylinder and having a retractable plate, front and rear connect bars, disposed between rear portion of base and debris shield canopy, wherein front connect bars are double bars disposed behind rear leg.
Said support is the typical form of four legs debris shield caving hydraulic support used now.
Although the commonly used several types of hydraulic support give good effectiveness and play an important role in development of coal industry, they have following disadvantages: Generally presented defect in adaptability of support type and surrounding rock; serious unbalance stressed condition between the forward and rearward row legs, the forward being largely stressed and the rearward slightly stressed, even tensely drawn, mechanical properties deteriorated, the support and shield ability can not be fully achieved, and support has bad adaptability to top plate. Especially with continuously raised requirement to obtain a high output with high efficiency of coal mining, two-leg electro hydraulic control support has been widely used abroad.
Now available four leg caving support is inconvenient to applying electro hydraulic control and increase level of automatization.
In order to overcome the disadvantages of existing sub level caving hydraulic support, the present invention provides a new type sub level caving hydraulic support, which can throughly eliminate defect of unbalance stressed condition between forward and rearward row legs, improve mechanical properties of support, increase adaptability of caving support to surrounding rock, improve support shield effectiveness of support in a sub level caving mining system working face, meet the requirement to obtain a high output with high efficiency of coal mining, easy to applying electro hydraulic control and production automatization.
In accordance with the present invention, there is provided a sub level caving hydraulic support including legs, a top canopy and a base hinged with both ends of the legs, a debris shield canopy hinged with a rear portion of the top canopy, a coal discharge mechanism located at a rear portion of the debris shield canopy, front and rear connect bars hinged between rear portion of the base and rear portion of the debris shield canopy, a transfer mechanism mounted at a middle portion of the base, a debris shield means located at a front portion of the top canopy; wherein the coal discharge mechanism includes a tail canopy hinged with a rear portion of the debris shield canopy, a retractable plate cylinder located in the tail canopy, a retractable plate pushed and pulled by said cylinder, a tail canopy cylinder hinged between the debris shield canopy and the tail canopy for swinging the tail canopy and discharging coal, wherein said legs are two legs arranged in a single row, one or two balance cylinders is/are disposed under the hinge point of the top canopy and debris shield canopy, and both ends of the balance cylinder(s) are hinged with the top canopy and debris shield canopy respectively.
The technical measure of the present invention to overcome the existing technical problem also may be: The sub level caving hydraulic support applying an integral top canopy, or so called rigidity top canopy.
The sub level caving hydraulic support also applying hinged top canopy, or so called sectional hinged top canopy, including a short top canopy, a front canopy, hinged therewith and a front canopy cylinder.
This support may apply two balance cylinders, disposed at a position near longitudinal axis centerline of top canopy and debris shield canopy.
This support may also apply single balance cylinder disposed at a position of longitudinal centerline of top canopy and debris shield canopy.
The extension end of retractable plate of this support has teeth in conical form; number of teeth is 5 9.
The leg seat for hinge connection of leg and top canopy, leg and base of this support is an integral cast structure.
The debris shield means of this support is a four connect bar mechanism, including a debris shield plate, hinged with front portion of top canopy, a debris shield plate cylinder, a short bar and a long bar.
The top canopy of this support is a top canopy equipped with movable side protect plate.
The advantageous effect of the present invention is: 0 The top canopy has only two legs, single row support, the legs are uniformly stressed, support and shield ability is fully achieved.
Z As compared to four leg support and shield hydraulic support, it can obviously reduce top control distance of top canopy, increase active support shield strength, improve support shield effect, it is beneficial to safe operation and high output with high efficiency.
Due to compact construction the distance between centers of front and rear conveyers is effectively reduced, it is beneficial to intensified management.
The coal discharge mechanism can discharge caved coal on back of debris shield canopy, thereby preventing the working condition of "antiaircraft gun" which is resulted by backward movement of pressure of gangue on back of debris canopy and top plate, it is favorite to reasonable working condition of two leg support.
0 The two leg sub level caving hydraulic support is easy to operate in lift and fall, as well as in movement, and facilitates the application of electro hydraulic control, realizing highly effective automation.
Can keep advantageous characteristics of sub level caving hydraulic support: a. The door for passing caved coal is low and continuous, excellent effect of coal passing is achieved without ridge loss, its ratio of caved coal to caving coal is high.
b. The rear conveyer disposed along base, floating coal is easy to discharge, movement of support is easy and rapid.
c. The retractable plate of tail canopy can break big piece of coal and thus can make the opening of coal door not easy to be blocked up.
d. Large space for passing caved coal in rear portion, large swing angle of tail canopy is favourable to caving roof seam, high efficiency of discharging coal.
e. Effectively reduce and obstruct coal dust.
The invention is now described, by way of non-limiting example only, with reference to the accompanying drawings in which: Fig. 1 is a schematic main view of structure of integratal sub level caving hydraulic support according to an example of the present invention; Fig. 2 is a schematic top view of structure of sub level caving hydraulic support of Fig.1; Fig. 3 is a schematic view of structure of debris shield means of sub level caving hydraulic support of Fig 1; Fig. 4 is a schematic main view of structure of movable side protect plate portion of top canopy; Fig. 5 is a schematic top view of structure of moveable side protect plate portion of top canopy; Fig. 6 is a schematic main view of structure of retractable plate of coal discharge mechanism.
Fig. 7 is a schematic top view of structure of retractable plate of coal discharge mechanism; Fig. 8 is a schematic main view of structure of hinged top canopy sub level caving hydraulic support, wherein: 1 top canopy, 2 debris shield canopy, 3 front connect bar, 4 rear connect bar, base, 6 tail canopy of coal discharge mechanism, 7 retractable plate, 8 legs, 9 balance cylinder, transfer mechanism, 11 debris shield means, 12 tail canopy cylinder, 13 retractable plate cylinder, 14 debris shield plate, short bar, 16 long bar, 17 debris shield plate cylinder, 18 movable side protect plate, 19 direction guide bar, side push cylinder, 21 fixed side protect plate, 22 teeth, 23 front canopy, 24 front canopy cylinder, short top canopy.
Detailed description of the invention Now the present invention will be described in combination with drawings and embodiments.
Embodiment 1 As shown in Fig 1, the sub level caving hydraulic support with a low positioned door for caved coal according to the present invention includes a top canopy 1, a debris shield canopy 2, front connect bar 3, rear connect bar 4, a base 5, legs 8, balance cylinder 9, a transfer mechanism 10, a debris shield means 11, a tail canopy 6 of coal discharge mechanism, a retractable plate 7 and a tail canopy cylinder 12.
Between top canopy 1 and base 5 two legs 8 are pivotally supporting, the rear portion of top canopy 1 is hinged with debris shield canopy 2, under hinge point of top canopy 1 and debris shield canopy 2 two balance cylinders 9 are disposed and hinged therewith, the rear portion of debris shield canopy 2 is hinged with tail canopy 6 of coal discharge mechanism, under hinge point of debris shield canopy 2 and tail canopy 6 a tail canopy cylinder 12 is disposed and hinged therewith, two front connect bars 3 and rear connect bar 4 are hinged between the rear portions of debris shield canopy 2 and base 5, a transfer mechanism 10 is disposed at middle portion of base 5, a debris shield means 11 is hinged with the front portion of top canopy 1.
In short, the present invention is a sub level caving hydraulic support with two legs supporting top canopy, four connect bar balance mechanism, and two front and rear conveyers, or so called two leg debris shield sub level caving hydraulic support.
There are only two legs 8 applied in single row arrangement, the space in front and behind the legs is walking pavement, legs 8 are double retractable legs, the leg seat is a integrally cast structure to ensure support strength. That is to say, leg seat is an integral casting with ribs integrally cast to increase bond strength between weld seams of leg seat and main ribs, as shown in Fig 1.
In Fig 2 the structure of base 5 and transfer mechanism 10 are at bottom portion of the support.
The base 5 is a sectional rigidity base, sectional box structure. On base a means for moving support and lifting base is disposed, which can lift front end of base more than 200mm, this may prevent from fall down of front end of base under condition of presence of mudstone and undulating in local floor, make it successfully pass over and reduce need to remove floating coal. The mean for lifting base can be integrally disassembled.
The transfer mechanism 10 is a reverse mounted long push bar mechanism, disposed at middle portion of base 5, the transfer mechanism is a box shaped structure. Both ends of transfer mechanism are connected with conveyer and transfer cylinder respectively, and is main component for movement of support and conveyer.
As shown in Fig 3, the debris shield means is hinged with front portion of top canopy 1 through four connect bar mechanism, the four connet bar mechanism is formed in the following manner: a debris shield plate 14 is hinged with front portion of top canopy 1 and a short bar 15, the lower end of short bar 15 is hinged with lower end of long bar 16 hinged with another pivot point of top canopy 1, the hinged pin of said lower end of long bar 16 is simultaneously hinged with the end of push bar of debris shield plate cylinder 17 hinged with top canopy 1. The debris shield plate 14 performs a function of turn over and back to flat level by means of said four connect bar mechanism 14-1. Its characteristic is large elevation angle.
In Fig 4, 5 a structure of movable side protect plate of top canopy 1 is shown.
The top canopy 1 is an integral top canopy, or so called integral rigidity top canopy. Top canopy 1 is equipped with movable side protect plate. Both side protect plates are used for sailing and prevention from turn down, wherein one side protect plate is a fixed side protect plate 21 and the other is a movable side protect plate 18, which can extend and retract. The movable side protect plates 18 are hinged with two side push cylinders 20, located in top canopy through direction guide bar 19, it performs extension and retraction by means of side push cylinder The debris shield canopy 2 is also equipped with movable protect plate, the structure thereof is the same as that of movable protect plate used in top canopy.
There are two balance cylinders 9 used, which are disposed at a position near longitudinal centerline of top canopy 1 and debris shield canopy 2, the main role of which is to adjust action point of resultant forces, to keep reasonable attitude of top canopy of the support. The use of two cylinders can increase adjustability of support shield condition of the support, thereby making it better to meet the variation of top plate condition and the variation of interaction of support and top plate due to caved coal at rear portion, so as to effectively ensure support and shield of the top plate.
The front and rear connect bars 3, 4 are hinged between rear portion of debris shield canopy 2 and rear portion of base 5 to form a four connect bar mechanism. Front connect bars 3 are double connect bars, and rear bar 4 is single connect bar. This normal four connect bar mechanism with double front and single rear connect bar can, in the one hand, increase torsion resistance of the support, making it more stable and more reliable, and provide a large space behind support, in the other hand, it is favorable for installation and repair at rear portion.
The coal discharge mechanism including a tail canopy 6, a retractable plate 7, a tail canopy cylinder 12 and a retractable plate cylinder 13.The tail canopy is directly hinged with rear portion of debris shield canopy 2, inside tail canopy 6, the retractable plate cylinder 13 and retractable plate, pushed and pulled thereby, are disposed, operation of the retractable plate cylinder 13 results in extension and retraction of retractable plate 7 in direction guide groove of tail canopy 6 to break large coal block, close gangue and discharge coal. The tail canopy cylinder 12 hinged between debris shield canopy 2 and tail canopy 6 is used for swinging tail canopy 6 up and down. When the tail canopy is swung up, the working space can be adjusted, and when the tail canopy is swung down, the retractable plate is contracted to perform coal discharge. The tail canopy of coal discharge mechanism also may equipped with movable protect plate, it consisting two side push cylinders, disposed at bottom of tail canopy, direction guide bar and movable protect plate.
In Fig 6, 7 the structure of retractable plate 7 of coal discharge mechanism is shown.
The teeth 22 of extended end of retractable plate 7 may be cone shaped, such as circular cone, prism, tetra prism teeth are preferred; reducing number of teeth to 5 9 can increase crushability of retractable plate.
The support applying high flow hydraulic system with double circuits of main input and return hydraulic to ensure speed of moving support. Highpressure spray apparatus can be mounted on debris shield canopy 2, rear connect bar 4 or tail canopy 6.
Embodiment 2 In Fig 8 a further aspect of the present invention is shown, that is two leg debris shield sub level caving hydraulic support with hinged top canopy, or so called sectional hinged top canopy, which includes a short top canopy a front canopy 23 and a front canopy cylinder 24. The front canopy 23 is hinged with front portion of short top canopy 25, front canopy cylinder 24 is hinged between short top canopy 25 and front canopy 23. Correspondingly, the debris shield means 11 of the four connect bar mechanism should be hinged with front canopy 23, i.e, the rear portion of debris shield plate 14, short bar 15, long bar 16 and debris shield plate cylinder 17 should be hinged with front portion of front canopy 23. Except this, the other portion of this embodiment is the same as that of embodiment 1.
In above mentioned two embodiments, the structure of integral top canopy is simple and reliable, the front portion of top canopy has large support shield force; hinged top canopy has complex structure, the front portion of top canopy has smaller support shield force than the former, but support has good adaptability Except above mentioned technical measures the following technical solutions also may be chosen: legs: applying single retractable leg with mechanical elongated bar.
0 balance cylinder: applying single cylinder disposed at longitudinal centerline of top canopy and debris shield canopy.
transfer mechanism: applying normal mounted short bar mechanism.
(D top canopy and debris shield canopy: applying them without movable protect plate.
9 coal discharge mechanism: the tail canopy thereof applied without movable protect plate.
debris shield means: applying debris shield cylinder directly hinged with debris shield plate, which is a retractable control plate.
manufacture: the main construction of support is made by welding high strength steel plate of grade 70 Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
Claims (11)
1. A sub level caving hydraulic support including legs, a top canopy and a base hinged with both ends of the legs, a debris shield canopy hinged with a rear portion of the top canopy, a coal discharge mechanism located at a rear portion of the debris shield canopy, front and rear connect bars hinged between rear portion of the base and rear portion of the debris shield canopy, a transfer mechanism mounted at a middle portion of the base, a debris shield means located at a front portion of the top canopy; wherein the coal discharge mechanism includes a tail canopy hinged with a rear portion of the debris shield canopy, a retractable plate cylinder located in the tail canopy, a retractable plate pushed and pulled by said cylinder, a tail canopy cylinder hinged between the debris shield canopy and the tail canopy for swinging the tail canopy and discharging coal, wherein said legs are two legs arranged in a single row, one or two balance cylinders is/are disposed under the hinge point of the top canopy and debris shield canopy, and both ends of the balance cylinder(s) are hinged with the top canopy and debris shield canopy respectively.
2. The sub level caving hydraulic support according to claim 1 wherein said top canopy is an integral top canopy.
3. The sub level caving hydraulic support according to claim 1 wherein said top canopy is a hinged top canopy including a short top canopy, a front canopy hinged with a front portion of said short top canopy, and a front canopy cylinder hinged with the front canopy and the short top canopy respectively.
4. The sub level caving hydraulic support according to claim 1 wherein two balance cylinders are located at a position near a longitudinal centerline of the top canopy and debris shield canopy.
The sub level caving hydraulic support according to claim 1 wherein a single balance cylinder is located at a position of a longitudinal centerline of the top canopy and debris shield canopy.
6. The sub level caving hydraulic support according to claim 1 wherein five to nine teeth are provided on an extended end of said retractable plate and said teeth are cone shaped.
7. The sub level caving hydraulic support according to claim 1 wherein a seat of said legs for hinge connect with the top canopy and base is in an integrally cast structure.
8. The sub level caving hydraulic support according to claim 1 wherein said debris shield means is formed from a debris shield plate, a debris shield plate cylinder, a short bar and a long bar, these four components being hinged to form a four connect bar mechanism.
9. The sub level caving hydraulic support according to claim 1 wherein said top canopy is equipped with a movable side protect plate.
The sub level caving hydraulic support substantially as hereinbefore described with reference to the accompanying drawings. k
11. The steps, features, compositions and compounds disclosed herein or referred to or indicated in the specification and/or claims of this application, individually or collectively, and any and all combinations of any two or more of said steps or features. DATED this THIRTIETH day of DECEMBER 2003 Yankuang Group Corporation by DAVIES COLLISON CAVE Patent Attorneys for the applicant(s)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031119212A CN100359132C (en) | 2003-03-05 | 2003-03-05 | Hydraulic coal mine support for low-position roof blasting-down |
| CN03111921.2 | 2003-03-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2003271396A1 AU2003271396A1 (en) | 2004-09-23 |
| AU2003271396B2 true AU2003271396B2 (en) | 2006-04-27 |
Family
ID=34283558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2003271396A Expired AU2003271396B2 (en) | 2003-03-05 | 2003-12-30 | A sub-level caving hydraulic support |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100359132C (en) |
| AU (1) | AU2003271396B2 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2544345C2 (en) | 2009-07-10 | 2015-03-20 | Джой ММ Делавэр, Инк. | Roof supports for longwall mining |
| DE202009015653U1 (en) * | 2009-11-25 | 2011-07-12 | Bucyrus Europe Gmbh | Shield cap for a shield extension |
| CN102562110B (en) * | 2010-12-17 | 2014-04-02 | 郑州四维机电设备制造有限公司 | Integrated hydraulic support of four-post paste filling supporting in thin coal seam |
| CN102587947A (en) * | 2012-02-13 | 2012-07-18 | 三一重型综采成套装备有限公司 | Hydraulic support |
| CN102808638A (en) * | 2012-08-20 | 2012-12-05 | 郑州煤矿机械集团股份有限公司 | Insertion plate for tail beam of sublevel caving coal hydraulic bracket |
| CN102900450A (en) * | 2012-09-05 | 2013-01-30 | 山东科技大学 | Caving coal hydraulic support with large swing beam structure |
| CN102926779A (en) * | 2012-11-16 | 2013-02-13 | 无锡阳工机械制造有限公司 | Hydraulic shielding bracket structure for coal face |
| CN103233762B (en) * | 2013-04-11 | 2015-06-17 | 山西平阳重工机械有限责任公司 | Two-prop shielding type electro-hydraulic-control top-coal caving hydraulic support |
| CN103195459B (en) * | 2013-04-24 | 2016-01-20 | 江苏蛟龙重工集团有限公司 | Low caving coal hydraulic support |
| CN103410517B (en) * | 2013-07-05 | 2016-02-24 | 中国煤炭科工集团太原研究院 | Speedy drivage is taken a step automatic moving type adhesive tape tail bracing or strutting arrangement |
| CN103470280A (en) * | 2013-09-24 | 2013-12-25 | 北京诚田恒业煤矿设备有限公司 | Dismountable top beam hydraulic support frame for coal mine |
| CN103670458A (en) * | 2013-12-17 | 2014-03-26 | 神华集团有限责任公司 | Fully mechanized coal-mining and fully mechanized caving face hydraulic support |
| CN107939434A (en) * | 2017-12-22 | 2018-04-20 | 郑州合新科技有限公司 | Single pendulum beam caving roof coal hydraulic support |
| CN108915749A (en) * | 2018-06-29 | 2018-11-30 | 平顶山平煤机煤矿机械装备有限公司 | Brettis with adjustable multistage waste rock board |
| CN110219688A (en) * | 2019-05-24 | 2019-09-10 | 浙江大学山东工业技术研究院 | Tiltable top beam low caving coal end hydraulic support |
| CN114738030B (en) * | 2022-04-06 | 2022-10-11 | 常州市新创智能科技有限公司 | Hydraulic support side protection plate and processing method |
| CN115405339A (en) * | 2022-08-31 | 2022-11-29 | 陕西旬邑青岗坪矿业有限公司 | Tensioning anti-skid device for coal mine support |
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| GB2297348A (en) * | 1995-01-23 | 1996-07-31 | Maszyn Glinik Sa Fab | Mining roof support |
| GB2316973A (en) * | 1996-09-07 | 1998-03-11 | Dbt Gmbh | Monitoring the load on mine shield supports |
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| DE3241894C1 (en) * | 1982-11-12 | 1984-03-15 | Thyssen Industrie Ag, 4300 Essen | Stabilising device for face support assemblies |
| CN2095936U (en) * | 1991-08-03 | 1992-02-12 | 朱旭 | Mechanical hydraulic support for top coal releasing |
| CN2170373Y (en) * | 1993-07-31 | 1994-06-29 | 王永胜 | Swinging tail beam type hydraulic support for blasting down roof of coal mine |
| CN2213848Y (en) * | 1994-11-21 | 1995-11-29 | 郑州煤矿机械厂 | Low-position caving hydraulic support for coal mine |
| CN2240607Y (en) * | 1995-11-16 | 1996-11-20 | 沈阳煤炭科学研究所 | hydraulic prop for blasting down the roof coal |
| DE19633847C1 (en) * | 1996-08-22 | 1997-07-24 | Dbt Gmbh | Hydraulically-operated walking walling-frame |
| CN1087807C (en) * | 1999-11-10 | 2002-07-17 | 兖矿集团有限公司 | Hydraulic prop frame for low position blasting down the roof coal |
| CN2612799Y (en) * | 2003-03-05 | 2004-04-21 | 兖矿集团有限公司 | Hydraulic prop frame for low position blasting down the roof coal |
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- 2003-03-05 CN CNB031119212A patent/CN100359132C/en not_active Expired - Lifetime
- 2003-12-30 AU AU2003271396A patent/AU2003271396B2/en not_active Expired
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2297348A (en) * | 1995-01-23 | 1996-07-31 | Maszyn Glinik Sa Fab | Mining roof support |
| GB2316973A (en) * | 1996-09-07 | 1998-03-11 | Dbt Gmbh | Monitoring the load on mine shield supports |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1526914A (en) | 2004-09-08 |
| AU2003271396A1 (en) | 2004-09-23 |
| CN100359132C (en) | 2008-01-02 |
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| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |