GB2274311A - Hydraulic support - Google Patents
Hydraulic support Download PDFInfo
- Publication number
- GB2274311A GB2274311A GB9300768A GB9300768A GB2274311A GB 2274311 A GB2274311 A GB 2274311A GB 9300768 A GB9300768 A GB 9300768A GB 9300768 A GB9300768 A GB 9300768A GB 2274311 A GB2274311 A GB 2274311A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alloy
- aluminium
- hydraulic support
- support
- separate hydraulic
- 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.)
- Withdrawn
Links
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 22
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 229910001234 light alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/005—Props; Chocks, e.g. made of flexible containers filled with backfilling material characterised by the material
- E21D15/007—Props; Chocks, e.g. made of flexible containers filled with backfilling material characterised by the material spark-reducing
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Actuator (AREA)
Abstract
A hydraulic support used to support the roof of coal-mine etc. comprises thin protective sleeve 7 fitted on the surfaces of the movable stem 2 extended from the hydraulic cylinder 1 and on the outer surface of the hydraulic cylinder 1 and its extending section which are all made of aluminium-alloy, so as to avoid sparks being struck from the aluminium alloy. <IMAGE>
Description
a shielded separate hydraulic support of light alloy
The invention relates to a separate hydraulic support of light - alloy, such as aluminium-alloy, which is used to support the roof of coal-mine pit, etc.
In the prior art, the cylinder, the movable stem and the extending section which constitute the separate hydraulic support are made of aluminium-alloy so as to reduce the weight of the support itself. However, up to now, the aluminiumalloy material hasn t passed the test for blast proof, then the separate hydraulic support in which some parts are made of aluminium--alloy hasn t obtained the certificate of blast proof either. Therefore, the device is prohibited to be still used in the coal-mine pit as a result of the risk of gas blast caused by spark resulting from bumping, according to the regulation issued by the Ministry of Energy of the PRC.
The objective of the invention is to provide a separate hydraulic support without the naked surface of aluminium-alloy.
For realizing the objective of the invention, the present invention provides a separate hydraulic support of aluminium - alloy, wherein the naked surface of the movable stem extended from the hydraulic cylinder and the outer surface of the hydraulic cylinder or its extending section which are all made of aluminiumalloy must be fitted with the protective sleeves. Thus, there appears no naked surface of the aluminium-alloy parts and in the operation, no spark can occur by accidental bumping of the aluminium-alloy parts so as to eliminate the risk of gas blast.
The merits of the invention are: simple structure; safe and reliable operation and offering opportunity still to use the separate hydraulic support in the coal-mine pit on a large scale.
The further detailed description of the invention will be given in reference to the attached drawing, which shows a schematic view of the separate hydraulic support of aluminium alloy according to the invention with the stem extended.
As shown in the drawing, the separate hydraulic support of aluminium - alloy comprises a movable stem of aluminium -- alloy 2, a hydraulic cylinder of aluminium - alloy 1, its extending section of afuminium - alloy 3, and a top cover 4, and a handle 5 as well as a bottom base 6 which are made of steel. A thin protective steel sleeve 7 is fitted on the naked surface of the movable stem 2 extended from the hydraulic cylinder 1 and on the outer surface of the hydraulic cylinder 1 and its extending section 3 which are all made of aluminium-alloy.
The sleeves 7 with the movable stem 2, the hydraulic cylinder 1 and its extending section 3 form an integral assembly so that the whole hydraulic support has no the naked surface of aluminium-alloy so as to avoid the risk of gas blast.
In the operation, the cylinder 1 is filled up with hydraulic oil through a three- way valve 8. Then, with pressure increasing, the movable stem 2 is extended from cylinder. In reverse, if the movable stem 2 is intended to be withdrawn, hydraulic oil is discharged through three-way valve 8, and with the help of the spring 9, the movable stem 2 returns to a withdrawn position.
Claims (4)
1. A separate hydraulic support of aluminium-alloy which is used to support the roof of coal-mine pit, comprising a cylinder of aluminium-alloy, an extending section of aluminium-alloy, a movable stem of aluminium-alloy, a top cover, a handle and a bottom base characterized in that a protective sleeve is fitted on the naked surface of movable stem extended from the hydraulic cylinder and the outer surface of the hydraulic cylinder and its extending section which are made of aluminium-alloy.
2. A separate hydraulic support as claimed in Claim 1 wherein the protective sleeve is made of steel.
3. A separate hydraulic support substantially as described herein with reference to the accompanying drawing.
4. A protective sleeve for use in a separate hydraulic support as claimed in any one of Claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9300768A GB2274311A (en) | 1992-01-26 | 1993-01-15 | Hydraulic support |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92201723 CN2118158U (en) | 1992-01-26 | 1992-01-26 | Aluminium alloy hydraulic single prop |
| GB9300768A GB2274311A (en) | 1992-01-26 | 1993-01-15 | Hydraulic support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9300768D0 GB9300768D0 (en) | 1993-03-03 |
| GB2274311A true GB2274311A (en) | 1994-07-20 |
Family
ID=25742885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9300768A Withdrawn GB2274311A (en) | 1992-01-26 | 1993-01-15 | Hydraulic support |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2274311A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058318C (en) * | 1997-08-27 | 2000-11-08 | 太原理工大学 | Single machinery prop |
| CN105402190A (en) * | 2015-12-02 | 2016-03-16 | 蒙阴金华机械有限公司 | Blind-hole oil cylinder inlaid with sleeve |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882229B (en) * | 2019-04-15 | 2024-02-27 | 辽宁鑫丰矿业（集团）有限公司 | Fully-mechanized coal mining face retraction sector supporting device and supporting system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4192479A (en) * | 1976-09-07 | 1980-03-11 | Friebe Herbert | Mine prop construction |
-
1993
- 1993-01-15 GB GB9300768A patent/GB2274311A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4192479A (en) * | 1976-09-07 | 1980-03-11 | Friebe Herbert | Mine prop construction |
| GB1588261A (en) * | 1976-09-07 | 1981-04-23 | Friebe A | Pit prop |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058318C (en) * | 1997-08-27 | 2000-11-08 | 太原理工大学 | Single machinery prop |
| CN105402190A (en) * | 2015-12-02 | 2016-03-16 | 蒙阴金华机械有限公司 | Blind-hole oil cylinder inlaid with sleeve |
| CN105402190B (en) * | 2015-12-02 | 2017-09-19 | 蒙阴金华机械有限公司 | Blind hole cylinder bore method of inhibiting corrosion |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9300768D0 (en) | 1993-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |