CN112112679A - Multifunctional supporting safety column for mining roadway - Google Patents
Multifunctional supporting safety column for mining roadway Download PDFInfo
- Publication number
- CN112112679A CN112112679A CN202011206732.8A CN202011206732A CN112112679A CN 112112679 A CN112112679 A CN 112112679A CN 202011206732 A CN202011206732 A CN 202011206732A CN 112112679 A CN112112679 A CN 112112679A
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- Prior art keywords
- safety
- supporting
- column
- connecting block
- safety post
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- 238000005065 mining Methods 0.000 title claims abstract description 9
- 230000001502 supplementing effect Effects 0.000 claims abstract description 13
- 238000013016 damping Methods 0.000 claims abstract description 12
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005474 detonation Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 4
- 230000003139 buffering effect Effects 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/03—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F11/00—Rescue devices or other safety devices, e.g. safety chambers or escape ways
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
- E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pulmonology (AREA)
- Emergency Management (AREA)
- Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
The invention discloses a multifunctional supporting safety column for an ore mining roadway, which comprises a safety column, a safety door and a position supplementing hydraulic rod, wherein the safety door is arranged on one side wall of the periphery of the safety column, the position supplementing hydraulic rod is arranged in the top end of the safety column, a connecting block is arranged at the top end of the position supplementing hydraulic rod, and a floating block is arranged in the connecting block. By arranging the connecting block, the floating block and the damping spring, a buffering mechanism can be provided for the supporting safety column and the supporting vault, so that the shock feeling generated in the operation machinery or soil can be buffered, the supporting column is prevented from displacing or loosening, and the supporting stability of the supporting column is improved; set up air bag and first-aid kit in through the safety pillar, can be in the tunnel back air bag protection around the miner avoid the impact of ore of collapsing, the first-aid kit can provide effectual rescue again for the miner simultaneously, the effectual loss that reduces personnel and property.
Description
Technical Field
The invention belongs to the technical field of roadway support, and particularly relates to a multifunctional support safety column for an ore excavation roadway.
Background
The roadway support has the advantages that a large number of roadways are needed for underground excavation, roadway support can keep the roadways smooth and surrounding rocks stable, the roadway support has important significance for coal mine construction and production, the roadway support basically aims to mitigate and reduce the movement of the surrounding rocks, the section of the roadway is not excessively reduced, meanwhile, scattered and damaged surrounding rocks are prevented from falling off, and the roadway support effect does not only depend on the supporting force of a support, but also is influenced by a series of factors such as the nature of the surrounding rocks, the mechanical properties (supporting force and contractibility) of the support, the installation density of the support, the morning and evening of the installation time of the support, the installation quality of the support and the contact mode (point contact or surface contact) with the surrounding rocks.
The support column that uses mostly all lacks absorbing device among the current roadway support, to the vibration sense that mechanical equipment or foundation soil layer produced in the mine, all make the support of support column take place the displacement easily, be unfavorable for the outrigger, secondly, lacks the device of lifesaving protection in the current support safety pillar, when the tunnel collapses, can not provide effectual equipment of saving oneself for the miner, the increase loss.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art, provides a multifunctional supporting safety column for an ore cutting roadway, and adopts the following basic concept in the technical scheme for solving the technical problem:
the multifunctional supporting safety column for the mine opening roadway comprises a safety column, a safety door and a position supplementing hydraulic rod, wherein the safety door is arranged on one side wall of the periphery of the safety column, the position supplementing hydraulic rod is arranged inside the top end of the safety column, a connecting block is arranged on the top end of the position supplementing hydraulic rod, and a floating block is arranged inside the connecting block.
The safety door is connected with the safety column in a clamping and pressing mode, the safety column is internally clamped and pressed with an air bag, a detonation structure of the air bag is in contact connection with the safety door, and the position supplementing hydraulic rod is embedded in the safety column.
The connecting block is fixedly connected with the position-supplementing hydraulic rod through a clamping groove, a damping spring is clamped and pressed in the connecting block, the floating block is installed with the connecting block through the damping spring in a matching way,
the laser displacement sensor is installed at the bottom of the floating block through the clamping groove, the pressure sensor module is clamped and pressed at the bottom in the connecting block, and the supporting vault is clamped and pressed at the top end of the floating block.
The supporting vault is characterized in that a slag blocking net is installed on the top wall of the supporting vault through screws, extension reinforcing steel bars are fixed in the inner wall of the supporting vault through clamping grooves, an alarm system assembly is installed on the bottom wall of the supporting vault through bolts, and the alarm system assembly comprises an illuminating lamp, an alarm lamp and a buzzer.
The emergency case is placed in the safety post under the safety airbag, ground piles are welded at the bottom of the safety post, and reinforcing steel bars are arranged on the ground piles.
The laser displacement sensor, the pressure sensor module, the position supplementing hydraulic rod and the alarm system component are electrically connected with external control equipment.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
1. The connecting block, the floating block and the damping spring are arranged, so that a buffering mechanism can be provided for the supporting safety column and the supporting vault, the vibration sense generated in the operation machinery or soil can be buffered, the supporting column is prevented from displacing or loosening, and the supporting stability of the supporting column is improved;
2. according to the invention, the safety airbag and the first-aid kit are arranged in the safety post, so that the safety airbag can protect surrounding miners from being impacted by ores after the roadway collapses, and meanwhile, the first-aid kit can provide effective rescue for the miners, thereby effectively reducing the loss of personnel and property.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to its proper form. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view showing a connection relationship between a connecting block, a slider, and a damping spring according to the present invention;
FIG. 3 is an elevational, cross-sectional view of the support dome of the present invention;
fig. 4 is an elevational view in cross section of the safety post of the present invention.
In the figure: 1-supporting a vault; 2, connecting blocks; 3-safety posts; 4-a position-compensating hydraulic rod; 5-a slag blocking net; 6-a slider; 7-damping spring; 8-extending the steel bars; 9-piling; 10-a pressure sensor module; 11-alarm system components; 12-a laser displacement sensor; 13-a safety door; 14-an airbag; 15-first aid kit.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
Example one
As shown in fig. 1-4, the multifunctional supporting safety column for the mine excavation roadway comprises a safety column 3, a safety door 13 and a position supplementing hydraulic rod 4, wherein the safety door 13 is arranged on one side wall of the periphery of the safety column 3, the position supplementing hydraulic rod 4 is arranged inside the top end of the safety column 3, a connecting block 2 is arranged at the top end of the position supplementing hydraulic rod 4, and a floating block 6 is arranged inside the connecting block 2.
In this example, the safety door 13 cannot be opened under normal conditions, and is bounced off by the igniter when an emergency situation occurs, the position-supplementing hydraulic rod 4 is used for adjusting the position of the top supporting structure so as to achieve optimal supporting and propping, and the connecting block 2 facilitates the installation and connection of the supporting structure and the supporting structure.
As shown in fig. 1-4, a safety door 13 is connected with a safety column 3 by clamping and pressing, an air bag 14 is clamped and pressed inside the safety column 3, a detonation structure of the air bag 14 is in contact connection with the safety door 13, a compensation hydraulic rod 4 is embedded in the safety column 3, a connecting block 2 is fixedly connected with the compensation hydraulic rod 4 through a clamping groove, a damping spring 7 is clamped and pressed inside the connecting block 2, a floating block 6 is installed in cooperation with the connecting block 2 through the damping spring 7, a laser displacement sensor 12 is installed at the bottom of the floating block 6 through the clamping groove, a pressure sensor module 10 is clamped and pressed at the bottom inside the connecting block 2, a supporting vault 1 is clamped and pressed at the top end of the floating block 6, a slag blocking net 5 is installed on the top wall of the supporting vault 1 through screws, an extension steel bar 8 is fixed in the inside wall of the supporting vault 1 through the clamping groove, and an alarm, the alarm system component 11 includes an illumination lamp, an alarm lamp, and a buzzer.
In this example, after the floating block 6 is extruded by the top supporting vault 1, the vibration sense generated by the top supporting is reduced by the internal damping spring 7, the vibration sense transmitted to the safety column 3 is further reduced, the supporting position and the angle of the safety column 3 are prevented from changing, the supporting stability of the safety column is prevented from being influenced, the laser displacement sensor 12 is used for measuring the downward movement data of the supporting vault 1, the pressure sensor module 10 is used for measuring the change value of the pressure received by the supporting vault 1, the extending steel bars 8 improve the flexibility of the supporting vault 1, when the large pressure is received, certain ductility is provided, the extrusion damage is prevented, and the alarm system component 11 carries out early warning according to the detection data of the laser displacement sensor 12 and the pressure sensor module 10.
As shown in fig. 2 and 4, an emergency case 15 is placed in the safety post 3 under the airbag 14, a ground pile 9 is welded at the bottom of the safety post 3, a reinforcing bar is arranged on the ground pile 9, and the laser displacement sensor 12, the pressure sensor module 10, the position-compensating hydraulic rod 4 and the alarm system component 11 are all electrically connected with external control equipment.
In this example, the safety airbag 14 detonates and ejects according to the impact force received by the safety pillar 3, after the ejection, the safety airbag 14 pushes away the safety door 13, so as to protect miners in the roadway, and meanwhile, the first-aid kit 15 in the safety pillar 3 is exposed, so that the miners can open and use the internal first-aid articles, thereby effectively reducing the loss of personnel and property.
In the embodiment, by arranging the connecting block 2, the floating block 6 and the damping spring 7, a buffering mechanism can be provided for the supporting safety column 3 and the supporting vault 1, so that the shock generated in the operation machinery or soil can be buffered, the supporting column is prevented from displacing or loosening, and the supporting stability of the supporting column is improved; through setting up air bag 14 and first-aid kit 15 in the air pillar 3, can be after the tunnel collapses air bag 14 protects around the miner and avoids the impact of ore, and first-aid kit 15 can provide effectual rescue again for the miner simultaneously, the effectual loss that has reduced personnel and property.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a multi-functional support safety post (3) in excavation roadway, includes safety post (3), emergency exit (13) and mends position hydraulic stem (4), its characterized in that, be provided with emergency exit (13) on the peripheral lateral wall of safety post (3), safety post (3) top is inside to be provided with mend position hydraulic stem (4), it is provided with connecting block (2) to mend position hydraulic stem (4) top, inside slider (6) that is provided with of connecting block (2).
2. The multifunctional supporting safety post (3) for the mining roadway according to claim 1, wherein the safety door (13) is connected with the safety post (3) in a clamping and pressing mode, an air bag (14) is clamped and pressed inside the safety post (3), a detonation structure of the air bag (14) is in contact connection with the safety door (13), and the position supplementing hydraulic rod (4) is embedded in the safety post (3).
3. The mining roadway multifunctional support safety column (3) as claimed in claim 1, wherein the connecting block (2) is fixedly connected with the position supplementing hydraulic rod (4) through a clamping groove, a damping spring (7) is clamped and pressed in the connecting block (2), and the floating block (6) is installed with the connecting block (2) in a matched mode through the damping spring (7).
4. The multifunctional supporting safety column (3) for the mining roadway is characterized in that a laser displacement sensor (12) is installed at the bottom of the floating block (6) through a clamping groove, a pressure sensor module (10) is clamped and pressed at the bottom in the connecting block (2), and a supporting vault (1) is clamped and pressed at the top end of the floating block (6).
5. The multifunctional supporting safety post (3) for the mining roadway is characterized in that a slag blocking net (5) is installed on the top wall of the supporting vault (1) through screws, extension steel bars (8) are fixed in the inner wall of the supporting vault (1) through clamping grooves, an alarm system component (11) is installed on the bottom wall of the supporting vault (1) through bolts, and the alarm system component (11) comprises an illuminating lamp, an alarm lamp and a buzzer.
6. A multifunctional supporting safety post (3) for mining roadways according to claim 5, characterized in that an emergency case (15) is placed in the safety post (3) under the safety airbag (14), a ground pile (9) is welded at the bottom of the safety post (3), and a reinforcing bar is arranged on the ground pile (9).
7. The mining roadway multifunctional supporting safety column (3) as claimed in claim 6, wherein the laser displacement sensor (12), the pressure sensor module (10), the reseating hydraulic rod (4) and the alarm system component (11) are electrically connected with external control equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206732.8A CN112112679A (en) | 2020-11-03 | 2020-11-03 | Multifunctional supporting safety column for mining roadway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011206732.8A CN112112679A (en) | 2020-11-03 | 2020-11-03 | Multifunctional supporting safety column for mining roadway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112112679A true CN112112679A (en) | 2020-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011206732.8A Pending CN112112679A (en) | 2020-11-03 | 2020-11-03 | Multifunctional supporting safety column for mining roadway |
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| Country | Link |
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| CN (1) | CN112112679A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464198A (en) * | 2021-06-25 | 2021-10-01 | 华能煤炭技术研究有限公司 | Rescue support device |
| CN114320402A (en) * | 2021-12-09 | 2022-04-12 | 中铁建大桥工程局集团第五工程有限公司 | Flood discharge cave body top dangerous rock protector |
| CN115962730A (en) * | 2023-03-16 | 2023-04-14 | 石家庄宜中机电技术有限公司 | Coal mine tunnel roof deformation dense grating on-line monitoring device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2167301C1 (en) * | 1999-11-29 | 2001-05-20 | Кузбасский государственный технический университет | Method of supporting mine workings in adjacent coal seams |
| CN108843364A (en) * | 2018-06-04 | 2018-11-20 | 李小丽 | A kind of coal mine driving suspension device with regulatory function |
| CN208950619U (en) * | 2018-11-12 | 2019-06-07 | 吴振芳 | A kind of support frame for digging laneway of mining |
| CN209308715U (en) * | 2018-12-11 | 2019-08-27 | 冯江生 | A kind of coal mine driving suspension device |
| CN210422663U (en) * | 2019-04-16 | 2020-04-28 | 刘丽峰 | Colliery is safety protection support in pit |
| CN210919094U (en) * | 2019-12-02 | 2020-07-03 | 肖继伟 | Coal mining roadway supporting device |
| CN211397627U (en) * | 2020-01-09 | 2020-09-01 | 危保明 | Supporting device for tunnel construction |
| CN111734465A (en) * | 2020-06-16 | 2020-10-02 | 王瑞超 | Supporting device for coal mine tunneling and operation method thereof |
-
2020
- 2020-11-03 CN CN202011206732.8A patent/CN112112679A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2167301C1 (en) * | 1999-11-29 | 2001-05-20 | Кузбасский государственный технический университет | Method of supporting mine workings in adjacent coal seams |
| CN108843364A (en) * | 2018-06-04 | 2018-11-20 | 李小丽 | A kind of coal mine driving suspension device with regulatory function |
| CN208950619U (en) * | 2018-11-12 | 2019-06-07 | 吴振芳 | A kind of support frame for digging laneway of mining |
| CN209308715U (en) * | 2018-12-11 | 2019-08-27 | 冯江生 | A kind of coal mine driving suspension device |
| CN210422663U (en) * | 2019-04-16 | 2020-04-28 | 刘丽峰 | Colliery is safety protection support in pit |
| CN210919094U (en) * | 2019-12-02 | 2020-07-03 | 肖继伟 | Coal mining roadway supporting device |
| CN211397627U (en) * | 2020-01-09 | 2020-09-01 | 危保明 | Supporting device for tunnel construction |
| CN111734465A (en) * | 2020-06-16 | 2020-10-02 | 王瑞超 | Supporting device for coal mine tunneling and operation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464198A (en) * | 2021-06-25 | 2021-10-01 | 华能煤炭技术研究有限公司 | Rescue support device |
| CN113464198B (en) * | 2021-06-25 | 2024-05-14 | 华能煤炭技术研究有限公司 | Rescue support device |
| CN114320402A (en) * | 2021-12-09 | 2022-04-12 | 中铁建大桥工程局集团第五工程有限公司 | Flood discharge cave body top dangerous rock protector |
| CN115962730A (en) * | 2023-03-16 | 2023-04-14 | 石家庄宜中机电技术有限公司 | Coal mine tunnel roof deformation dense grating on-line monitoring device |
| CN115962730B (en) * | 2023-03-16 | 2023-05-12 | 石家庄宜中机电技术有限公司 | On-line monitoring device for deformation dense grating of coal mine tunnel roof |
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Application publication date: 20201222 |