CN101852088A - Method for controlling dismantling device - Google Patents
Method for controlling dismantling device Download PDFInfo
- Publication number
- CN101852088A CN101852088A CN201010110487A CN201010110487A CN101852088A CN 101852088 A CN101852088 A CN 101852088A CN 201010110487 A CN201010110487 A CN 201010110487A CN 201010110487 A CN201010110487 A CN 201010110487A CN 101852088 A CN101852088 A CN 101852088A
- Authority
- CN
- China
- Prior art keywords
- mining equipment
- gas
- gas concentration
- digging amount
- concentration
- 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.)
- Granted
Links
Images
Landscapes
- Testing And Monitoring For Control Systems (AREA)
- General Factory Administration (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Sampling And Sample Adjustment (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention provides a method for controlling a dismantling device along a work face of underground mining. The method involves measuring gas concentration by a gas sensor, and operating a dismantling device in dependence on the result of the measurement. When the gas concentration is close to a predetermined maximum critical value of the gas concentration, the control device keeps the gas concentration inside the work face under the predetermined maximum limit value by reduction of the dismantling quantity of the dismantling device, without stopping the dismantling device, and the excavating depth is decreased by reduction of the dismantling quantity of the dismantling device.
Description
The application is to be that September 4, application number in 2007 are 200710149515.8 the applying date, and denomination of invention is divided an application for the application of " being used to drive the method for mining equipment ".
Technical field
The present invention relates to a kind of method, be used for controlling, wherein come measure gas concentrations, and send alarm signal according to measurement result by at least one gas sensor along mining equipment at the work plane of underground mine.
Background technology
This type method is open from practice basically, and is used for determining dangerous gas concentration, particularly unallowed high concentration of methane gas.Can determine the rising of gas concentration in work plane by measure gas concentrations, thereby the alarm signal that can pass through to be sent realizes early warning.For example this alarm signal can trigger the sense of hearing and/or visual display device, and perhaps this alarm signal is closed the consumer in work plane, so that make the danger of methane blast drop to minimum.Have only when carrying out that measured methane value reduces again after enough ventilation a period of times, mining operations just can be proceeded.
Problem in the disclosed method is, although used modern monitoring technology, still always occurs the methane blast at present in underground mine, is that operating personnel deliberately carry out artificial improper manipulation to gas sensor to this one of them reason.Therefore known from practice, cover gas sensor in order to improve daily output, perhaps carry air stream to this gas sensor continuously, thereby this gas sensor can not detect in esse gas concentration in work plane.The possible reason of another of gas burst may be that gas sensor produces fault.
Summary of the invention
The objective of the invention is to, a kind of method and apparatus is provided, utilize this method and apparatus can be in artificial improper manipulation or the fault that detects gas sensor in service constantly.
This purpose realizes by the feature of independent claims, and particularly realize thus, promptly measure digging amount by the mining equipment exploitation, it is measure gas concentrations, promptly when the underproof correlation determined between the exploitation digging amount measured and the measured gas concentration, send alarm signal.
The present invention is based on following understanding, promptly the methane that in exploitation, produces by coal at least approximately and the digging amount proportional.At this, the value of one ton of methane gas that coal produced of every exploitation for example is about 20m3.Therefore, when the digging amount raise or reduce, measured gas concentration can raise or reduce (having delay usually in time) equally.And then, can measure by the time graph of digging amount relatively and measured gas concentration, between these two measured values, be qualified or underproof correlation.Equally also can detect by comparing absolute value, whether may have artificial improper manipulation gas sensor at different time points.When the digging amount rises, determine gas concentration too and rise, and the digging amount determines concentration of methane gas and descend too (having delay usually in time) when descending, can think qualified correlation so.Yet, if by covering or spraying artificial this gas sensor of improper manipulation with fresh air, because the gas concentration of being measured does not rely on the fluctuation of digging amount basically, just has underproof correlation so between digging amount and gas concentration.In this case, send alarm signal, so that active ating displaying device or stop exploitation operation for example the reason of alarm signal occurs up to eliminating, and guarantees that the concentration of methane gas in work plane is enough low.
An advantageous embodiment of the invention is described in manual, accompanying drawing and dependent claims.
According to advantageous embodiments, can calculate the digging amount by the speed and the excavation depth of mining equipment.The possibility that optionally is used to calculate the digging amount of being exploited is, weighs for the material of being exploited by the ribbon conveyer scale that is arranged on the conveying circuit, perhaps utilizes ultrasonic measurement to calculate delivered volume.Yet the present invention is not limited to described method.
According to one of the inventive method favourable variant,, therefore can reduce the methane concentration in the work plane when exploitation by the digging amount that reduces mining equipment because the methane and the digging amount that are produced by coal are at least approximately proportional.When correspondingly reducing the digging amount, reduced equally by the methane that sprays in the coal, thereby the methane concentration in the work plane can keep below predetermined maximum critical value, and there is no need to stop fully exploitation.When measured gas concentration is enough low, can certainly correspondingly improve the digging amount of mining equipment again.Therefore, in the process that continues, can so regulate the digging amount, promptly be no more than or only surpass momently and be scheduled to maximum critical value.In the method according to this invention variant, because digging amount here is at first after exploitation beginning even also rising, so also can detect possible artificial improper operation to gas sensor.Therefore, even under gas concentration remains on predetermined maximum critical value the time, also should be when the digging amount raises and same rising in work plane gas inside concentration.If not so, measured gas concentration descends suddenly, the underproof correlation of this meaning person between digging amount and gas concentration, thereby the alarm signal of sending although perhaps be substantially equal to original digging amount.
According to a further aspect in the invention, the present invention relates to a kind ofly be used for controlling,, and drive mining equipment based on measurement result wherein by at least one sensor measurement gas concentration along method in the mining equipment of the work plane of underground mine.
This method is known in practice, wherein the sensor in known method (with direction of ventilation) is arranged on the buttock, and when measured gas concentration (particularly measured methane concentration) surpassed predetermined critical, mining equipment was stopped fully.When after measured methane value is by enough ventilation regular hours, descending, just operation once more of mining equipment in this method.
In order in work plane, not reduce under the situation of safety, improve the productivity ratio of mining operations, when approaching the predetermined maximum critical value of gas concentration, by reducing the digging amount of mining equipment, make in work plane gas inside concentration to remain under the predetermined maximum critical value, and do not stop mining equipment simultaneously.
Because the methane and the digging amount that are produced by coal when exploitation are at least approximately proportional, so can be reduced in the methane concentration of work plane inside by the digging amount that reduces mining equipment.When correspondingly reducing the digging amount, also reduced by the methane that sprays in the coal, thereby can remain under the predetermined maximum critical value, and there is no need to stop fully exploitation at the methane concentration of work plane inside.When measured gas concentration is enough low, can certainly correspondingly improve the digging amount of mining equipment.Therefore, in the process that continues, can so regulate the digging amount, promptly be no more than or only surpass momently and be scheduled to maximum critical value.
On the basis of digging amount that is calculated and measured gas concentration, can calculate the gas content in the material of being exploited, wherein the methane that is spilt by the coal amount of new excavation can be considered to long-pending proportional with the coal body that is excavated very approx.Utilization can so be regulated the digging amount corresponding to the gas content of digging amount, promptly is no more than predetermined maximum gas concentration, needn't stop mining operations fully simultaneously.In other words, by reducing delivered volume, for example long-pending by reducing exploitation rate or excavation depth, can so reduce the coal body of being exploited, promptly the methane content that is discharged when exploitation is no more than the threshold of permission.Because do not pre-determine, but at first measure, utilize the variant of this method, when exploiting, also can notice the methane content of change by measurement at the methane content that this discharged.
According to another embodiment, can a plurality of gas sensors be set along work plane, methane transducer particularly, wherein so control or detect gas sensor, measured the place before mining equipment when promptly in direction of ventilation, moving, when direction of ventilation is moved, should measure the place and after mining equipment, realize.Therefore, on the different position of work plane inside, measure, wherein in mining equipment with measure spacing approximately constant preferably between the place, in other words, measure the place and before mining equipment or afterwards, move according to the spacing of traffic direction with approximately constant.
Utilize the variant of method of the present invention because measure the place be in mining equipment near, fast detecting goes out dangerous methane and raises basically.In known method, produce the time point of methane excavating coal and measure under to pass through about 3 to 5 minutes time period between the gas concentration, according to the present invention, owing to always measure near the coal that is excavated, measurement result will draw within several seconds on the contrary.In principle, the method according to this invention only also can utilize a gas sensor that is arranged on buttock to implement.
In addition, advantageously, be not to determine predetermined maximum critical value with immobilizing, but dynamically formulate this threshold.Thereby for example advantageously, particularly, allow only of short duration this threshold that exceeds constantly when (in other words directly on the spot form) measures when exceeding in work plane inside.When in the buttock setting only during a unique sensor, this sensor measurement is to mixing comparatively speaking and methane/air mixture that water down by ventilation.In contrast, be bound to occur higher methane concentration, shut down or minimizing digging amount but this methane concentration needn't cause along exploitation part, forward position.
When the position based on mining equipment changes predetermined maximum critical value, be favourable equally.Using under the situation of a unique gas sensor, if measure high methane concentration at buttock, when mining equipment is in work plane at the first bruss, the situation of this high methane concentration is considered to emergency.In contrast, when mining equipment is in the work plane tail end,, perhaps can bear high methane concentration owing to perhaps only be rising local and that the time is gone up limited methane concentration in this case.
The influence of mining equipment digging amount can automatically realize that by control appliance for example exploitation rate and/or excavation depth are reduced automatically when gas concentration raises.On the other hand, the gas concentration of rising also can be passed through the visual display device demonstration in work plane inside, so that inform the driver to mining equipment, thereby this driver must reduce exploitation rate and/or excavation depth.
For example can be on a plurality of positions of work plane inside, signalization device on the per ten exploitation position for example, this recoil simulator is informed the miner, whether measured gas concentration is higher than or is lower than predetermined critical.
According to another aspect of the present invention, the present invention relates to a kind of force piece (Strebausbau), this force piece has a plurality of gas sensors that particularly evenly separate, and wherein these gas sensors can preferably be called respectively by control appliance based on the position of mining equipment.Therefore, when on the work plane control appliance that can be connected to original existence at work plane gas inside sensor, be particularly advantageous.This known basically work plane control appliance is used for control production position, electric hydaulic ground, and this work plane control appliance with its separately adjacent machine and link to each other with central control equipment, by this way, call each gas sensor individually or fully by central control equipment, the extra-pay that is used in the methane measurement simultaneously minimizes.
When implement being detected by the control appliance with calculation element is qualified between digging amount and gas concentration or during underproof correlation, is favourable.For example control appliance can utilize the time graph of computer recording exploitation digging amount and measured gas concentration, and to detect existing correlation by suitable algorithm be qualified or defective.For example after at interval rising surpasses predetermined threshold value at the fixed time in the digging amount, when the rising that identifies gas concentration surpasses another predetermined threshold, can send alarm signal.On the contrary, when measured gas concentration descends, but when finding exploitation digging amount and correspondingly not reducing, can send alarm signal equally.After mining equipment is stopped, must identify the tangible decline of measured methane concentration, even when the decline of this gas concentration can lingeringly occur in time.If for example to the artificial improper operation of carrying out of gas sensor, promptly aim at gas sensor and spray the fresh air stream that continues, so measured gas concentration remains unchanged basically, thereby utilize the method according to this invention, determine underproof correlation between digging amount and gas concentration, and then send alarm signal.
Description of drawings
Below, exemplarily the present invention will be described by embodiment and with reference to accompanying drawing.Shown in the figure:
Fig. 1 is the schematic schematic diagram of force piece;
Fig. 2 is the digging amount of being exploited and the measured schematic curve of gas concentration when qualified correlation; And
Fig. 3 is the curve when underproof correlation among Fig. 2.
The specific embodiment
The schematic diagram of the very big simplification of force piece has been shown among Fig. 1, and this force piece has a plurality of exploitation positions 10 that are arranged side by side, and this exploitation position is connected with the conveyer (not shown) in common mode.Label 12 expression mining equipment, this mining equipment can be designed as roller mill (Walze) or coal plough (Hobel).Direction of ventilation utilizes arrow W to show in the diagram, and is distinguished and admirable in other words mobile counterclockwise in schematic diagram 1.
In order to measure the inner methane concentration that occurs in the path, for example in the per ten exploitation position, methane transducer 14 is set along this work plane, this methane transducer is connected with control appliance 20 by common bus 16.At this, bus 16 can be a data/address bus, and the control appliance of each exploitation position 10 utilizes the communication each other of this data/address bus.This external buttock is provided with another methane transducer 18.Utilize control appliance 20 (this control appliance can be the central control equipment of each exploitation position 10) can individually control or call gas sensor 14, more precisely according to individually controlling or call gas sensor 14 along the position (these positions are detected by control appliance 20 equally) of the mining equipment 12 of exploiting the forward position.At this, methane transducer 14 is called in this wise or is selected, and promptly in the mining equipment that moves, when advancing with direction of ventilation, the place of measurement is in before the mining equipment 12, and when with when direction of ventilation advances, is in after this mining equipment.In other words, move before mining equipment 12 or afterwards with changeless distance in the place of measurement.
By the communication line (not shown), the speed of mining equipment is delivered on the control appliance 20 on the one hand, the excavation depth of being regulated is delivered to this control appliance on the other hand, and this control appliance 20 calculates the digging amount based on this speed and excavation depth, that is to say the quantity of the coal of being exploited.This control appliance is determined the methane content of the material of exploiting by digging amount of being calculated and measured methane concentration then.This calculating is carried out constantly, thereby calculates different gas concentrations when the gas content in the material of being exploited changes.
Fig. 2 show very briefly be represented by dotted lines by control appliance record be the digging amount of unit with the cubic meter, and to show be the gas concentration of unit with percentage with being measured by gas sensor of representing of chain-dotted line.As shown in the figure, along with the rising of digging amount, gas concentration raises too, and this gas concentration is almost being followed the curvilinear motion of digging amount in time.When control appliance was measured this correlation, this correlation was proved to be qualified and does not send alarm signal.
Fig. 3 shows recovery process equally very briefly, in this recovery process, the artificial improper operation to methane transducer occurred in moment t1.Because this manual operation, though the digging amount almost remains unchanged, measured concentration of methane gas sharply descends.At this, for example can derive (Ableitung) gas concentration signal by the very first time and the image of the exploitation digging amount measured is determined by control appliance, these two measured values are not in situation much at one, thereby can send alarm signal.
In addition, control appliance 20 is calculated specified digging amount on the basis of the gas content of calculating in advance, and the exploitation of this specified digging amount has caused a gas concentration, and this gas concentration is under the predetermined maximum gas concentration (marking with max in Fig. 3).When the methane content of the coal of for example being exploited improved, control appliance 20 automatically reduced exploitation rate and/or excavation depth, and then did not reach predetermined maximum methane concentration, as shown in Figure 3.
Selectively or additionally, control appliance 20 can be controlled different visual display devices, this display device is arranged on the inside of work plane, for example is arranged on the per ten backplate place again, and this display device also can be connected on the control appliance of exploitation position.This visual displays for example can have the signal optical source of three kinds of different colors, wherein green glow represents that measured methane concentration is lower than threshold value, red light source can represent that concentration has reached threshold value, and yellow light sources can represent that measured methane concentration is near threshold value.By this way, the operator of mining equipment can manually for example correspondingly adjust the digging amount by reducing exploitation rate or excavation depth.
Utilize the method according to this invention or, can constantly and not have so control production operation interruptedly, promptly do not reach the methane threshold by changing the digging amount according to device of the present invention.Simultaneously, under the situation of considering methane content, make digging amount optimization, and can identify artificial improper manipulation gas sensor.
Claims (17)
1. one kind is used for controlling along the method in the mining equipment of the work plane of underground mine, wherein by at least one gas sensor measure gas concentrations, and drive mining equipment based on measurement result, it is characterized in that, when approaching the predetermined maximum critical value of gas concentration, make in work plane gas inside concentration by the digging amount that reduces described mining equipment by control appliance and to remain under the described predetermined maximum critical value, and need not to stop described mining equipment, and in order to reduce the digging amount minimizing excavation depth of mining equipment.
2. method according to claim 1 is characterized in that, calculates described digging amount by the speed and the excavation depth of described mining equipment, and is calculated the gas content of the material of exploiting by described digging amount of being calculated and measured described gas concentration.
3. method according to claim 1, it is characterized in that, along described work plane a plurality of described gas sensors are set, and when described mining equipment advances with direction of ventilation, measuring the place realized before described mining equipment, when advancing on direction of ventilation, realize after described mining equipment in then described measurement place in described mining equipment.
4. method according to claim 1, it is characterized in that, when described mining equipment advances with direction of ventilation, measuring the place realized before described mining equipment with constant spacing, when advancing on direction of ventilation, realize after described mining equipment with constant spacing in then described measurement place in described mining equipment.
5. method according to claim 1 is characterized in that described gas sensor is arranged on buttock.
6. method according to claim 1 is characterized in that, changes described predetermined maximum critical value according to the position of described mining equipment and/or according to temporal fluctuation.
7. method according to claim 1 is characterized in that, in the described work plane especially by visual display device show measured gas concentration whether near or reach described default maximum gas concentration.
8. method according to claim 7 is characterized in that, carries out in the described work plane of being presented at of a plurality of positions inside.
9. be used to implement the force piece according to the method for claim 1, described force piece comprises mining equipment (12) and a plurality of exploitations position (10), it is characterized in that, along described force piece a plurality of gas sensors (14) is set.
10. force piece according to claim 9 is characterized in that, described gas sensor (14) is separated equably.
11. force piece according to claim 9 is characterized in that, described gas sensor (14) is called respectively by control appliance (20) based on the position of described mining equipment (12).
12. force piece according to claim 9 is characterized in that, sees on direction of ventilation, extra gas sensor (18) is arranged on the end of described work plane.
13. force piece according to claim 9 is provided with visual display device on a plurality of exploitations position (10), utilize described visual display device to show, whether measured gas concentration approaches or reaches predetermined maximum gas concentration.
14. force piece according to claim 9, it is characterized in that, each described exploitation position (10) has an electrical control equipment, and the control appliance that described electrical control equipment is adjacent carries out communication, and described gas sensor (14) is connected at least some described control appliances.
15. be used for the control appliance of force piece according to claim 9, it is characterized in that, described control appliance is provided with calculation element, utilize described calculation element to calculate the digging amount, and utilize described calculation element to calculate the gas content of exploitation material by described digging amount of calculating and measured described gas concentration according to the speed and the excavation depth of mining equipment (12).
16. control appliance according to claim 15 is characterized in that, comprising: calling device, utilize described calling device one by one to call a plurality of sensors (14), input unit is used for importing in advance the maximum gas concentration value,
Comparison means utilizes described comparison means to calculate measured gas concentration and predetermined maximum gas concentration, and
Output, described output are relatively exported according to this and are shown signal and/or control signal.
17. control appliance according to claim 15, it is characterized in that, described calculation element is set, utilizes described calculation element to calculate specified digging amount, then cause gas concentration to maintain under the predetermined maximum gas concentration with described specified digging amount exploitation according to the gas content of being calculated.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006041570.1 | 2006-09-05 | ||
| DE102006041570.1A DE102006041570B4 (en) | 2006-09-05 | 2006-09-05 | Method for controlling a mining device, longwall construction for carrying out the method and control for such a longwall construction |
| DE200710014662 DE102007014662B4 (en) | 2007-03-27 | 2007-03-27 | Method for operating a mining device, longwall construction for carrying out the method and control for such a longwall construction |
| DE102007014662.2 | 2007-03-27 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101495158A Division CN101139938B (en) | 2006-09-05 | 2007-09-04 | Method and equipment for driving mining device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101852088A true CN101852088A (en) | 2010-10-06 |
| CN101852088B CN101852088B (en) | 2013-01-30 |
Family
ID=40528267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010110487 Expired - Fee Related CN101852088B (en) | 2006-09-05 | 2007-09-04 | Method for controlling dismantling device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101852088B (en) |
| RU (1) | RU2374444C2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103216232A (en) * | 2013-04-09 | 2013-07-24 | 中国矿业大学 | Method for automatically regulating and controlling conveying load of high-gas coal face |
| CN113677870A (en) * | 2019-04-03 | 2021-11-19 | 蒂森克虏伯工业解决方案股份公司 | Method and device for enabling an automatic operation of a material extraction installation at a working face of a material extraction site |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777212A (en) * | 2012-08-10 | 2012-11-14 | 中国建筑第四工程局有限公司 | Monitoring method of tunnel gas |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2213858B (en) * | 1987-12-17 | 1991-09-25 | Coal Ind | Equipment and method for measuring convergence |
| US5087099A (en) * | 1988-09-02 | 1992-02-11 | Stolar, Inc. | Long range multiple point wireless control and monitoring system |
| CN1096846A (en) * | 1993-06-25 | 1994-12-28 | 于斌 | Coal mine gas monitoring and controlling system |
| PL182078B1 (en) * | 1997-01-30 | 2001-11-30 | Glowny Instytut Gornictwa | Electronic circuit arrangement of a conductometric meter for measuring co 2, co and ch4 content in gases |
| UA61611A (en) * | 2003-03-17 | 2003-11-17 | Vasyl Viktorovych Bilonozhko | System for controlling inflammable gas content in mine atmosphere |
| CN2761848Y (en) * | 2005-01-21 | 2006-03-01 | 陕西恒润科技发展有限公司 | Mine alarm positioning device |
| CN2787839Y (en) * | 2005-05-23 | 2006-06-14 | 辽宁工程技术大学 | Multi-source information gas monitoring instrument |
| CN1786422A (en) * | 2005-11-29 | 2006-06-14 | 李铁顺 | Method and system for monitoring gas in mine |
-
2007
- 2007-09-04 CN CN 201010110487 patent/CN101852088B/en not_active Expired - Fee Related
- 2007-09-04 RU RU2007133239/03A patent/RU2374444C2/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103216232A (en) * | 2013-04-09 | 2013-07-24 | 中国矿业大学 | Method for automatically regulating and controlling conveying load of high-gas coal face |
| CN113677870A (en) * | 2019-04-03 | 2021-11-19 | 蒂森克虏伯工业解决方案股份公司 | Method and device for enabling an automatic operation of a material extraction installation at a working face of a material extraction site |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2007133239A (en) | 2009-03-10 |
| RU2374444C2 (en) | 2009-11-27 |
| CN101852088B (en) | 2013-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103434816B (en) | Scraper conveyer chain condition monitoring and protection system | |
| CN104555343B (en) | A kind of underground coal mine coal-face self-adapting intelligent drag conveyor | |
| CN105293078B (en) | Cigarette machine wire-feeding pipe wind speed balance method and unit control apparatus | |
| CN101852088B (en) | Method for controlling dismantling device | |
| CN101139938B (en) | Method and equipment for driving mining device | |
| CN103216266A (en) | Pressure detecting method for preventing clogging of filling pipeline | |
| CN105300097A (en) | Detecting device for rollers of roller kiln | |
| TW200626124A (en) | Air-Massager Anomaly Detecting System | |
| CN106379708B (en) | A kind of coal stream equalising control device and its control method | |
| CN202968487U (en) | Steel wire rope tension detection system for hydraulic decoking of delayed coking device | |
| CN105690260A (en) | Building stone continuous polishing and grinding process online detection system based on displacement sensing technology | |
| CN202729267U (en) | Emergency stop protective device of conveying equipment | |
| CN202039099U (en) | Strip breakage protective device of silicon steel continuous annealing machine set | |
| CN105259329B (en) | On-line identification method for adjustment and calibration of gas sensor of coal mine safety monitoring system | |
| CN206705159U (en) | A kind of mine belt conveyor monitoring device safe for operation | |
| KR20130024533A (en) | Fire detection apparatus and system | |
| CN205820258U (en) | Go up embryo detection alarm device | |
| CN206358804U (en) | A kind of coal stream equalising control device | |
| CN110126875A (en) | Barrier equipment and its coal mine subincline assistant conveyance prevent-moving car system | |
| CN210863893U (en) | Cable terminal fault on-line monitoring device | |
| CN201766344U (en) | Alarm system | |
| KR101032554B1 (en) | System and method for measuring discharging speed of molten iron and liquid level using molten iron detecting sensor | |
| CN213688435U (en) | Mining belt conveyor integrated protection sensor testing arrangement | |
| CN211015854U (en) | Tamping hammer breakage alarm system | |
| CN110441480B (en) | Detection system and detection method of gas sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20190904 |