CN203025298U - Remote coal mine electricity leakage testing equipment - Google Patents
Remote coal mine electricity leakage testing equipment Download PDFInfo
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- CN203025298U CN203025298U CN 201220733224 CN201220733224U CN203025298U CN 203025298 U CN203025298 U CN 203025298U CN 201220733224 CN201220733224 CN 201220733224 CN 201220733224 U CN201220733224 U CN 201220733224U CN 203025298 U CN203025298 U CN 203025298U
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- 238000012360 testing method Methods 0.000 title claims abstract description 165
- 230000005611 electricity Effects 0.000 title abstract description 13
- 239000003245 coal Substances 0.000 title abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 29
- 238000004880 explosion Methods 0.000 claims description 6
- 230000006855 networking Effects 0.000 abstract description 15
- 238000011065 in-situ storage Methods 0.000 abstract description 10
- 238000010998 test method Methods 0.000 abstract description 8
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- 239000007858 starting material Substances 0.000 description 3
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- 239000004020 conductor Substances 0.000 description 1
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Abstract
The utility model discloses remote electricity leakage testing equipment special for a coal mine. The equipment is characterized by comprising a coal mine power circuit (5) for power supply, an electricity leakage testing device (3) which is arranged and connected to the farthest control switch (2) of the coal mine power circuit (5), a leakage detection protection device (1) connected with the electricity leakage testing device (3) through the coal mine power circuit (5), and a monitoring system (4) or a substation JK connected with the electricity leakage testing device (3), wherein the electricity leakage testing device (3) is arranged in an explosion-proof shell M or a general shell. The remote electricity leakage test can be realized in situ, and remote electricity leakage test can be realized through networking. According to the equipment, the gap that special equipment is absent in the remote electricity leakage test is filled, and the remote electricity leakage test method is safely and conveniently performed in a time-saving mode by utilizing the equipment.
Description
Technical field
The utility model relates to the mine safety field, relates in particular to a kind ofly to realize networking and dual-purpose on the spot colliery distance leakage testing equipment.
Technical background
" safety regulations in coal mine " the 457 regulation: on the low voltage feeder line of down-hole, must installing leak detection protective device or earth leakage protective device selectively, guarantee automatically to cut off the feeder line of electric leakage.Must carry out 1 trip test every day to the ruuning situation of low pressure leakage detection apparatus.
" low pressure leak detection protection detailed rules and regulations " 19 regulations: under fireboss's cooperation, the leak detection protective device of new installation is done an artificial leakage tripping test in a distant place before putting into operation first.Operating leak detection protective device is done an artificial leakage tripping test in a distant place per month at least.When the protective device of selectively hunting leak is done the artificial leakage tripping test in a distant place; total leak detection protective device should be after branch switch disconnects be done artificial leakage tripping test in the branch switch porch, and all the other branch switches should be done respectively an artificial leakage tripping test in a distant place.Test method is: in the load side of the gauge tap of distal-most end by different electric pressures access test resistances (127V is with 2k Ω, 10W resistance, and 380V is with 3.5k Ω, 10W resistance, and 660V is with 11k Ω, 10W resistance, 1140V with 20k Ω, 10W resistance).Whether for example in the electromagnetic starter of distal-most end, a spiral shell that terminates at fuse tube of test resistance is buckled, and the other end is connected on shell, covers power transmission after enclosing cover, observe feeding switch and trip.As tripping operation, leak detection protective device reliable in action is described.Test complete after, remove test resistance.
As the 19th regulation of above-mentioned " the low pressure leak detection protection detailed rules and regulations " quoted of this paper, existing distance leakage testing method does not have special distance leakage testing device, need to access test resistance before test in electromagnetic starter.There is following drawback:
Dangerous: the switch Explosion-proof cap be need to open, electrical verification, discharge needed, need to be at 660V or 1140V circuit connecting resistance, these are all with unsafe factor.
Lack of standardization: the gauge tap inside of distal-most end does not have special ground terminal, equals to increase components and parts at the inner access of switch test resistance, does not meet the explosion-proof criteria requirement.
Inconvenient: as to need electrician and fireboss all in person to arrive on-the-spot.Need the fireboss to coordinate, check gas density, have a power failure, uncap, electrical verification, discharge.
Time-consuming: as to need the contact fireboss, need contact to have a power failure.Check gas density, have a power failure, uncap, electrical verification, discharge, access resistance, lid lid, power transmission, starting switch, all need the time.
Difficult check: the gauge tap majority of distal-most end is magnetic starter, and majority does not have display window, and whether distance leakage testing has played effect (whether having stopped electricity), is difficult to accurately distinguish.
Summary of the invention
The purpose of this utility model is exactly the problem that exists in order to overcome above-mentioned prior art, and a kind of colliery distance leakage testing device that is exclusively used in is provided, and the utility model both can be realized distance leakage testing on the spot, also can network and realize distance leakage testing.
In order to realize above-mentioned purpose of the present utility model, provide following technical scheme:
A kind of colliery distance leakage testing equipment comprises: the colliery power line that is used for power supply; Install and be connected to the leak(age) test device at power line distal-most end gauge tap place, colliery, it is arranged in explosion-resistant enclosure M or general shell; The leak detection protective device that connects described leak(age) test device by the colliery power line.
Preferably, a kind of colliery distance leakage testing equipment also comprises supervisory system or the substation that connects described leak(age) test device.
Preferably, described leak(age) test device comprises: the one end connects the earth test resistance of the arbitrary phase of described gauge tap mains side three-phase line; Be connected to the switch execution unit between the described earth test resistance other end and ground wire.
Preferably, described leak(age) test device also comprises: the control assembly that is used for controlling the make-break operation of described switch execution unit that connects described supervisory system or substation; Described control assembly is connected to switch protection parts on the power line of described colliery.
Preferably, described leak(age) test device also comprises: be connected to the second control knob between the described earth test resistance other end and ground wire.
Preferably, described control assembly comprises: the described gauge tap mains side of its elementary connection triple-phase line is appointed the transformer of two-phase; Its input end connects the rectifier of described transformer secondary output; The treating apparatus that connects described supervisory system or substation, its power input connect the input of described rectifier or connect the power supply input of described substation; Connect the secondary local manual controller of described rectifier, it is made of the first control knob and the relay coil that are connected in series.
Preferably, described switch execution unit comprises: by the switch contact of described treating apparatus control; Switch contact by local manual controller control.
Preferably, described treating apparatus is cutoff instrument, and described cutoff instrument has: the controlled end that connects supervisory system or substation control end via operation circuit; The feedback end that connects supervisory system or substation monitoring client via feedback line; And external power supply end.
Preferably, described switch protection parts comprise: described primary is connected to fuse and the disconnector that described gauge tap mains side triple-phase line is appointed two-phase.
Preferably, a kind of colliery distance leakage testing equipment also comprises: be arranged on the power line of colliery and connect the feed sensor of described supervisory system or substation; What be connected to transformer secondary output is used for judging whether successful pilot lamp of distance leakage testing.
Preferably, the distance leakage testing device is arranged on as in its custom-designed flameproof enclosure M and other explosion-resistant enclosures or general shell M, the contact of the first control knob and the second control knob is arranged on shell M the inside, and operating grip passes the wall of shell M, leaks in shell M outside.
Preferably, supervisory system or substation can independently be installed, and also can be arranged in feeding switch.
The beneficial effects of the utility model embody in the following areas:
1, safety: distance leakage testing equipment of the present utility model is directly installed in explosion-resistant enclosure, need not to open the switch Explosion-proof cap; Need not to carry out electrical verification, discharge, need not at 660V or 1140V circuit access resistance.
2, convenient: as when utilizing the utility model to carry out distance leakage testing, to need not the fireboss and coordinate, need not contact and have a power failure in advance; Need not to check gas density, need not to have a power failure, uncap, electrical verification, discharge.
3, save time: when carrying out distance leakage testing, need not to contact the fireboss, need not contact and have a power failure; Need not to check gas density, need not to have a power failure, uncap, electrical verification, discharge, need not to access resistance, lid lid, power transmission, starting switch.
4, convenient check: when carrying out distance leakage testing, ground or underground monitoring system show test action (power failure) situation and automatic Memory; The telemechanical switch has display window, is convenient to full-time electrician and observes.
A kind of colliery of the utility model distance leakage testing equipment has promotional value very much.
Description of drawings
Fig. 1 is the theory diagram of the utility model distance leakage testing equipment;
Fig. 2 is the composition schematic diagram of leak(age) test device shown in Figure 1;
Fig. 3 is the electrical schematic diagram of the utility model distance leakage testing equipment.
Embodiment
As shown in Figure 1, the utility model is used for realizing networking and dual-purpose on the spot colliery distance leakage testing equipment, comprising: the colliery power line 5 that is used for power supply; Install and be connected to the leak(age) test device 3 at gauge tap 2 places of colliery power line 5 distal-most end, it is arranged in explosion-resistant enclosure M or general shell; The leak detection protective device 1 that connects leak(age) test device 3 by colliery power line 5; Be used for checking the testing fixture of colliery distance leakage testing result.Wherein, by controlling leak(age) test device 3 ground connection; produce ground current or reduce impedance ground in the loop that colliery power line 5, leak(age) test device 3 and leak detection protective device 1 form; when leak detection protective device 1 detects this ground current or zero-sequence current or impedance ground; cut off the power supply of colliery power line 5; so that testing fixture is according to the cut-out of 1 pair of leak(age) test device of leak detection protective device, 3 power supplies; or distance leakage testing personnel viewing lamp, judge whether distance leakage testing is successful.Testing fixture for checking colliery distance leakage testing result of the present invention can be to connect supervisory system 4 or the substation JK of leak(age) test device 3.
A kind of colliery distance leakage testing equipment, also comprise and be arranged on colliery power line 5 and connect supervisory system 4 or the feed sensor 6 of substation JK, be used for the electric current of colliery power line 5 is detected, and testing result is sent to supervisory system 4 or substation JK.
A kind of colliery distance leakage testing equipment also comprises the pilot lamp HL that is arranged on B level of transformer, is used for the distance leakage testing personnel and judges by viewing lamp HL whether distance leakage testing is successful.
As shown in Figure 2, leak(age) test device 3 comprises: the one end connects the earth test resistance R b of the gauge tap 2 arbitrary phase lines of mains side triple-phase line; Be connected to the switch execution unit 31 between the earth test resistance R b other end and ground wire; The control assembly 32 that is used for 31 make-break operations of gauge tap execution unit that connects supervisory system 4 or substation JK; Control assembly 32 and earth test resistance R b are connected to switch protection parts 33 on colliery power line 5; Be connected to the second control knob SA2 between the earth test resistance R b other end and ground wire, be used for carrying out earth test according to the local manual operation.
As shown in Figure 3, control assembly 32 comprises: its elementary connection gauge tap 2 mains side triple-phase lines are appointed the transformer B of two-phase; The rectifier ZL of B level of its input end connection transformer; The treating apparatus DJ that connects supervisory system 4 or substation JK, its power input connects the input of rectifier ZL or connects the power supply input of substation JK, be used for carrying out make-break operation according to the instruction gauge tap execution unit 31 of supervisory system 4 or substation JK, and the power failure information of presenting colliery power line 5 to supervisory system 4 or substation JK; Connect the local manual controller of ZL level of rectifier, it is made of the first control knob SA1 and the relay coil J that are connected in series.
Particularly, switch protection parts 33 comprise fuse RD and disconnector GK, and transformer B is elementary to be connected on colliery power line 5 by fuse RD and disconnector GK.
Treating apparatus DJ is cutoff instrument, and this cutoff instrument has: the controlled end that connects supervisory system 4 or substation JK control end via operation circuit kx; The feedback end that connects supervisory system 4 or substation JK monitoring client via feedback line fx; And the external power supply end, this power input connects the input of rectifier ZL or connects the power supply input of substation JK.
As shown in Figure 1, utilize the utility model a kind of colliery distance leakage testing equipment to carry out the method for distance leakage testing, comprise the following steps:
Install and connect a leak(age) test device 3 being positioned at colliery power line 5 distal-most end gauge tap 2 places; Leak detection protective device 1 connects by colliery power line 5 the leak(age) test device 3 that is positioned at distal-most end gauge tap 2 places, for it is provided for detecting the testing circuit whether leak electricity in a distant place; By controlling leak(age) test device 3 ground connection, produce the ground current of the colliery power line 5 of flowing through, leak(age) test device 3 and leak detection protective device 1; Leak detection protective device 1 detects this ground current, makes electric leakage protection relay KA action, and KA1 connects feeding switch contactor KM, the KM action, and the KM1 tripping operation, thus cut off colliery power line 5; Colliery power line 5 is detected, or distance leakage testing personnel viewing lamp HL, in order to determine whether distance leakage testing is successful.
As shown in Figure 1, the step that the colliery power line is detected comprises:
The step that the colliery power line is detected also comprises:
Voltage or electric current by 3 pairs of colliery power lines 5 of leak(age) test device detect, and obtain voltage or current detection signal, and voltage or current detection signal are fed back to supervisory system 4 or substation JK by fx; Supervisory system 4 or substation JK are according to voltage or current detection signal, or distance leakage testing personnel viewing lamp HL, in order to determine whether distance leakage testing is successful.Particularly, colliery power line 5 is in the situation that the power supply cut-out, the leak(age) test device 3 of connection colliery power line 5 will obtain its input voltage or electric current is zero power failure information, supervisory system 4 or substation JK can according to this power failure information, determine that distance leakage testing succeeds.
The step of controlling leak(age) test device 3 earth tests comprises: leak(age) test device 3 carries out distance leakage testing according to the test dictation of supervisory system 4 or substation JK.
The step of controlling leak(age) test device 3 earth tests also comprises: leak(age) test device 3 carries out distance leakage testing according to the local manual operation.
As shown in Figure 3, distance leakage testing device 3 is arranged on as in its custom-designed flameproof enclosure M and other explosion-resistant enclosures or general shell M, the contact of the first control knob SA1 and the second control knob SA2 is arranged on shell M the inside, operating grip passes the wall of shell M, leakage is in shell M outside, in order to can operate control knob SA1, SA2 when carrying out in situ test outside shell M.Supervisory system 4 or substation JK can independently install, and also can be arranged in feeding switch.Treating apparatus DJ adopts connected mine/electric power monitoring system 4 or supporting telemechanical switch or the cutoff instrument of substation JK all can.According to " low pressure leak detection protection detailed rules and regulations " requirement, select earth test resistance R b according to electric pressure, other elements are all common components, get final product by the relevant regulations design.
Below in conjunction with Fig. 3, the distance leakage testing method is described in detail:
the first networking test method: on the supervisory system 4 or its substation JK in control room, press the distance leakage testing button, the distance leakage testing instruction is passed to treating apparatus DJ by control line kx, after DJ obtains instruction, gauge tap contact DJ1 is closed, earth test resistance R b and the earth are connected, and produce ground current in the loop that colliery power line 5, leak(age) test device 3 and leak detection protective device 1 form at this moment, leak detection protective device 1 detects this ground current, leak detection protective relay KA action, KA1 connects feeding switch contactor KM, the KM action, the power supply of colliery power line 5 is cut off in the KM1 tripping operation, the power cut-off at distal-most end gauge tap 2 places, connect the leak(age) test device 3 of colliery power line 5 in the situation that power failure, will obtain its input voltage or electric current is zero power failure information, treating apparatus DJ is to supervisory system 4 or substation JK feedback power failure information, after receiving feedback signal, supervisory system 4 or substation JK delay time, send cut-off signal to DJ, DJ controls the DJ1 disconnection after getting signal, networking realizes the distance leakage testing success, the distant place off-test of once networking.After test is completed, control room computer automatic Memory, the yardman makes a record on register.
The second networking test method: on the supervisory system 4 or its substation JK in control room, press the distance leakage testing button, the distance leakage testing instruction is passed to treating apparatus DJ by control line kx, after DJ obtains instruction, gauge tap contact DJ1 is closed, earth test resistance R b and the earth are connected, and produce ground current in the loop that colliery power line 5, leak(age) test device 3 and leak detection protective device 1 form at this moment; Leak detection protective device 1 detects this ground current, leak detection protective relay KA action, and KA1 connects feeding switch contactor KM, the KM action, the power supply of colliery power line 5 is cut off in the KM1 tripping operation, the power cut-off at distal-most end gauge tap 2 places; Feed sensor 6 is in the situation that power failure, will obtain the voltage of colliery power line 5 or current detection signal and is zero information, and this detection signal is fed back to supervisory system 4 or substation JK by fx1; Delay time after supervisory system 4 or substation JK receive feedback signal, send cut-off signal to DJ, DJ controls the DJ1 disconnection after getting signal, and networking realizes distance leakage testing success, the distant place off-test of once networking.After test is completed, control room computer automatic Memory, the yardman makes a record on register.
During practical operation, can select as required above any one networking test method.
The first in situ test method: full-time electrician arrives the front of power supply grid distal-most end gauge tap 2 under coal mine, press the first control knob SA1 of leak(age) test device 3, the relay coil J action that series connection with it connects, the J1 adhesive of gauge tap contact, earth test resistance R b and the earth are connected, produce ground current in the loop that colliery power line 5, leak(age) test device 3 and leak detection protective device 1 form at this moment; Leak detection protective device 1 detects this ground current; leak detection protective relay KA action; KA1 connects feeding switch contactor KM; the KM action; the power supply of colliery power line 5 is cut off in KM1 tripping operation, the power cut-off at distal-most end gauge tap 2 places, and pilot lamp HL extinguishes; realize on the spot the distance leakage testing success, once distant place off-test on the spot.Full-time electrician reports the control room, and the yardman makes a record on register.
The second in situ test method: full-time electrician arrives the front of power supply grid distal-most end gauge tap 2 under coal mine, press the second control knob SA2 of leak(age) test device 3, earth test resistance R b and the earth are connected, produce ground current in the loop that colliery power line 5, leak(age) test device 3 and leak detection protective device 1 form at this moment; Leak detection protective device 1 detects this ground current; leak detection protective relay KA action; KA1 connects feeding switch contactor KM; the KM action; the power supply of colliery power line 5 is cut off in KM1 tripping operation, and pilot lamp HL extinguishes, the power cut-off at distal-most end gauge tap 2 places; realize on the spot the distance leakage testing success, once distant place off-test on the spot.Full-time electrician reports the control room, and the yardman makes a record on register.
During practical operation, can select as required above any one in situ test method.
Colliery of the present utility model power power supply signal, control signal and feedback signal also can be transmitted by multiple conductor cable, or pass through carrier-wave transmission.
The testing circuit whether the utility model leaks electricity for detection of a distant place can also be the zero sequence current detection device commonly used or carrier sense provision etc.
The utility model also can judge whether distance leakage testing is successful by distance leakage testing personnel viewing lamp HL.
The voltage of distal-most end gauge tap 2 load side is 660V, selects earth test resistance R b=11K Ω, power 10w.
In situ test: not and meet the second control knob SA2, the first control knob SA1 is not installed carries out.
Networking test: power supply c, the d of power supply a, the b for the treatment of apparatus DJ and substation JK are connected together, be that the power supply of distance leakage testing device 3 and the substation JK of certain model supervisory system 4 share a power source special, the feedback signal for the treatment of apparatus DJ is taken out from rectifier ZL; Distance leakage testing is carried out in the mine/electric power monitoring system 4 of selection typing or substation JK and treating apparatus DJ networking.
The voltage of distal-most end gauge tap 2 load side is 1140V, selects earth test resistance R b=20K Ω, power 10w.
In situ test: not and meet the second control knob SA2, the first control knob SA1 is not installed carries out.
The networking test: power supply c, the d for the treatment of apparatus DJ is connected on the input end of rectifier ZL, the power supply a of the substation JK of supervisory system 4, b independent current source, and the feedback signal for the treatment of apparatus DJ is taken out from rectifier ZL; Distance leakage testing is carried out in the mine/electric power monitoring system 4 of selection typing or substation JK and treating apparatus DJ networking.If treating apparatus DJ is not installed, the test of also just can not networking just can only be carried out in situ test.
The voltage of distal-most end gauge tap 2 load side is 127V, selects earth test resistance R b=2K Ω, power 10w.
In situ test: appoint two-phase from circuit ABC triple-phase line, through disconnector GK or fuse RD access transformer B and pilot lamp HL, and draw earth test resistance R b, Rb is by the second control knob SA2 ground connection, the switch contact DJ1 of device DJ or the switch contact J1 that local manual controller is controlled are not managed in the joint, manually press the second control knob SA2, in situ test distant place electric leakage, during success of the test, pilot lamp HL extinguishes.
The detailed step that above three embodiment carry out distance leakage testing is described in detail with reference to preamble, does not repeat them here.
Although above-mentioned the utility model is described in detail; but the utility model is not limited to this; those skilled in the art can modify according to principle of the present utility model; therefore, all various modifications of carrying out according to principle of the present utility model all should be understood to fall into protection domain of the present utility model.
Claims (10)
1. a colliery distance leakage testing equipment, is characterized in that, comprising:
The colliery power line (5) that is used for power supply;
Install and be connected to the leak(age) test device (3) that colliery power line (5) distal-most end gauge tap (2) is located, it is arranged in explosion-resistant enclosure M or general shell;
The leak detection protective device (1) that connects described leak(age) test device (3) by colliery power line (5).
2. equipment according to claim 1, is characterized in that, also comprises the supervisory system (4) or the substation JK that connect described leak(age) test device (3).
3. equipment according to claim 2, is characterized in that, described leak(age) test device (3) comprising:
The one end connects the earth test resistance (Rb) of the arbitrary phase of described gauge tap (2) mains side three-phase line;
Be connected to the switch execution unit (31) between described earth test resistance (Rb) other end and ground wire.
4. equipment according to claim 3, is characterized in that, described leak(age) test device (3) also comprises:
The control assembly (32) that is used for controlling described switch execution unit (31) make-break operation that connects described supervisory system (4);
Described control assembly (32) is connected to switch protection parts (33) on described colliery power line (5).
5. equipment according to claim 4, is characterized in that, described leak(age) test device (3) also comprises: be connected to the second control knob (SA2) between described earth test resistance (Rb) other end and ground wire.
6. equipment according to claim 4, is characterized in that, described control assembly (32) comprising:
The described gauge tap of its elementary connection (2) mains side triple-phase line is appointed the transformer (B) of two-phase;
Its input end connects the secondary rectifier (ZL) of described transformer (B);
The treating apparatus (DJ) that connects described supervisory system (4) or substation JK, its power input connect the input of described rectifier (ZL) or the power supply input of described substation (JK);
Connect the secondary local manual controller of described rectifier (ZL), it is made of the first control knob (SA1) that is connected in series and relay coil (J).
7. equipment according to claim 6, is characterized in that, described switch execution unit (31) comprising:
Switch contact (DJ1) by described treating apparatus (DJ) control;
Switch contact (J1) by local manual controller control.
8. equipment according to claim 6, is characterized in that, described treating apparatus (DJ) is cutoff instrument, and described cutoff instrument has:
The controlled end that connects supervisory system (4) or substation JK control end via operation circuit;
The feedback end that connects supervisory system (4) or substation JK monitoring client via feedback line; And
The external power supply end.
9. equipment according to claim 6, is characterized in that, described switch protection parts (33) comprising:
Be connected to fuse (RD) and the disconnector (GK) that described gauge tap (2) mains side triple-phase line is appointed two-phase described transformer (B) is elementary.
10. equipment according to claim 2, is characterized in that, also comprises:
Be arranged on colliery power line (5) and go up and connect the feed sensor (6) of described supervisory system (4) or substation JK;
Be connected to secondary being used for of transformer (B) and judge whether successful pilot lamp (HL) of distance leakage testing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220733224 CN203025298U (en) | 2012-12-26 | 2012-12-26 | Remote coal mine electricity leakage testing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220733224 CN203025298U (en) | 2012-12-26 | 2012-12-26 | Remote coal mine electricity leakage testing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203025298U true CN203025298U (en) | 2013-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220733224 Expired - Lifetime CN203025298U (en) | 2012-12-26 | 2012-12-26 | Remote coal mine electricity leakage testing equipment |
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| CN (1) | CN203025298U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101574A1 (en) * | 2012-12-26 | 2014-07-03 | Guo Chunping | Coal mine remote leakage test method and device |
-
2012
- 2012-12-26 CN CN 201220733224 patent/CN203025298U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101574A1 (en) * | 2012-12-26 | 2014-07-03 | Guo Chunping | Coal mine remote leakage test method and device |
| US20150355258A1 (en) * | 2012-12-26 | 2015-12-10 | Chunping Guo | Method and apparatus for remote coal mine leakage test |
| US9575109B2 (en) * | 2012-12-26 | 2017-02-21 | Chunping Guo | Method and apparatus for remote coal mine leakage test |
| EA030501B1 (en) * | 2012-12-26 | 2018-08-31 | Чуньпин Го | Coal mine remote leakage test method and device |
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