CN203660947U - Mining torque limiting type permanent magnetic transmission device - Google Patents
Mining torque limiting type permanent magnetic transmission device Download PDFInfo
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- CN203660947U CN203660947U CN201320660670.7U CN201320660670U CN203660947U CN 203660947 U CN203660947 U CN 203660947U CN 201320660670 U CN201320660670 U CN 201320660670U CN 203660947 U CN203660947 U CN 203660947U
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Abstract
The utility model discloses a mining torque limiting type permanent magnetic transmission device which is arranged between an electromotor and a working machine. The mining torque limiting type permanent magnetic transmission device comprises a mining torque limiting type magnetic force coupler, an input end rotary speed sensor, an output end rotary speed sensor, an input end infrared temperature sensor, an output end infrared temperature sensor and a PLC controller. The mining torque limiting type permanent magnetic transmission device is applied to on-site practical production of a coal mine, a few problems that occur in traditional mechanical and hydraulic coupling transmission devices are solved, a practical on-site transmission problem is well solved. High transmission efficiency is realized. Functions such as an electromotor soft start function, an electromotor overload protection function, a load volatility bearing function and the like are achieved. Equipment operation condition can be monitored in a real-time manner through a remote monitoring system, and faults in unusual conditions can be diagnosed.
Description
Technical field
The utility model belongs to mining equipment transmission field, and a kind of mining distance-limiting type permanent magnetic transmission device is provided especially.
Background technology
The transmission device major part of equipment that colliery is used is traditional mechanical transmission and load limiting type of constant filling fluid coupling at present, traditional mechanical transmissions is not pointed in the application of coal production, in a lot of details, do not reach the standard of safety of coal mines, and exist power consumption, easy to wear, centering to require high drawback.The maintenance of fluid-flywheel clutch is harder, and sealing is difficult to guarantee, oil sealing place oil leakage phenomenon is serious, and input and output will have good centering, when the bad operation of centering vibrations larger, the useful life of the serious wear reduction equipment to other parts of equipment.
In mine equipment transmission field, due to the uncertainty of load, must carry out overload protection to motor.What at present traditional mechanical transmission often adopted is thermal relay protected mode, and in the time that overload appears in working machine end, it is out of service that when the running current of motor exceedes rated current, thermal relay will cut off main circuit motor, reaches the overload protection object of motor.Thermal relay is more responsive to temperature, the variable effect of ambient temperature the correct judgement to electric current of thermal relay, greatly affected opportunity of overload protection.Loading on of requiring in actual production that motor drags generally do not allow careless shutdown, even motor overload can make its life-span reduce, also should not allow thermal relay rashly thread off, in order to avoid suffer the economic loss more much higher than motor price because stopping production.Be limited to the number of times of its dropout the useful life of thermal relay, therefore it is not suitable for the motor of frequent starting, rotating frequent transitions, heavy load starting is carried out to overload protection.
Load limiting type of constant filling fluid coupling also can carry out overload protection to motor.In the time that load is excessive, the oil pressure of fluid-flywheel clutch inside increases rapidly, and the oil of fluid-flywheel clutch inside will be sprayed and be reduced internal pressure motor side and can run well and reach the overload protection of realizing motor by valve like this.Mining equipment mode operations that adopt multi-machine interaction as many in ribbon conveyer and drag conveyor etc., each motor needs to carry out overload protection.In the time there is overload in part; fluid-flywheel clutch is for protecting motor to carry out oil spout; will cause in succession like this other each fluid-flywheel clutch to occur overload phenomenon; all there is the state of oil spout in fluid-flywheel clutch; in the time returning to normal production; need be to the fluid-flywheel clutch maintenance such as change oil, so not only time-consuming but also effort had extended the coal production cycle, and coal production is caused to very large economic loss.
Utility model content
The purpose of this utility model is to provide a kind of mining distance-limiting type permanent magnetic transmission device, adopts contactless pure machine driving, and long service life is non-maintaining; Can carry out overload protection to motor, after load is normal, can restart voluntarily, can realize frequent start-stop, soft start electric motors function; Can realize self adaptation to load, can bear fluctuating load and not affect normal transmission efficiency.
The technical solution of the utility model is: a kind of mining distance-limiting type permanent magnetic transmission device, be arranged between motor 1 and working machine 2, comprise: mining distance-limiting type magnetic coupling 3, input speed probe 4, output speed probe 5, input infrared temperature sensor 6, output infrared temperature sensor 7, PLC controller 8, described input speed probe 4 detects for the rotating speed of the input to mining distance-limiting type magnetic coupling 3, described output speed probe 5 detects for the rotating speed of the output to mining distance-limiting type magnetic coupling 3, described input infrared temperature sensor 6 detects for the input temperature to mining distance-limiting type magnetic coupling 3, described output infrared temperature sensor 7 detects for the output temperature to mining distance-limiting type magnetic coupling 3, described PLC controller 8 respectively with motor 1, input speed probe 4, output speed probe 5, input infrared temperature sensor 6, output infrared temperature sensor 7 connects.
Preferably, described mining distance-limiting type permanent magnetic transmission device also comprises long distance control system 9, and described long distance control system 9 is connected with the PORT COM of PLC controller 8.
Input speed probe 4, output speed probe 5, input infrared temperature sensor 6, output infrared temperature sensor 7 are monitored in real time to the running status of mining distance-limiting type magnetic coupling 3, signal is transferred to PLC controller 8, PLC controller 8 is controlled the start and stop of motor 1 by the state of input signal, long distance control system 9 can by with PLC controller 8 communications whole device is monitored and failure diagnosis.
Preferably, described mining distance-limiting type magnetic coupling 3 comprises: shaft coupling, input speed measuring fluted disc 304, magnetic conductor rotor, permanent magnet rotor, power transmission shaft 316, input bearing 314, output bearing 313, output speed measuring fluted disc 315; Described magnetic conductor rotor and permanent magnet rotor are set in power transmission shaft 316 outsides, described permanent magnet rotor is located at magnetic conductor internal rotor, described magnetic conductor rotor is connected by input bearing 314, output bearing 313 respectively with power transmission shaft 316, described permanent magnet rotor can be slided along power transmission shaft 316 in magnetic conductor rotor, described shaft coupling is located at the input of power transmission shaft 316 and is connected with magnetic conductor rotor, described input speed measuring fluted disc 304 is sleeved on shaft coupling outside, and described output speed measuring fluted disc 315 is sleeved on the output outside of power transmission shaft 316.
Preferably, described shaft coupling is plum blossom disc couplin, and described plum blossom disc couplin is made up of motor side half plum blossom dish shaft coupling 301, elasticity plum blossom dish 302 and coupling device end half plum blossom dish 303; Described input speed measuring fluted disc 304 is sleeved on coupling device end half plum blossom dish 303 outsides.
Preferably, described magnetic conductor rotor comprises: input mounting disc 305, output mounting disc 311 and be connected the connector 307 of input mounting disc 305 and output mounting disc 311, described input mounting disc 305 is positioned at input one end of power transmission shaft 316 and is connected with power transmission shaft 316 by input bearing 314, described output mounting disc 311 is positioned at output one end of power transmission shaft 316 and is connected with power transmission shaft 316 by output bearing 313, described input mounting disc 305 and output mounting disc 311 are positioned at permanent magnet rotor one side and are respectively equipped with magnetic conductor 306, described input mounting disc 305 and output mounting disc 311 are respectively equipped with fin 310 away from permanent magnet rotor one side, described input mounting disc 305 and output mounting disc 311 form flameproof joint I and flameproof joint II with connector 307 respectively, described input mounting disc 305 and output mounting disc 311 form flameproof joint III and flameproof joint IV with power transmission shaft 316 respectively.
Preferably, described permanent magnet rotor comprises: two p-m rotor disk bodies 308 and two centrifugal bodies 309, described two p-m rotor disk bodies 308 can slide along power transmission shaft 316 in magnetic conductor rotor, described two centrifugal bodies 309 are between two p-m rotor disk bodies 308, and be located on the p-m rotor disk body 308 of input of close power transmission shaft 316, described two centrifugal bodies 309 are about axial symmetry.
Preferably, described centrifugal body 9 is by orthogonal support plate I, support plate II and be connected support plate I and the spring of support plate II forms, and described support plate I is fixed on p-m rotor disk body 308.Support plate II can swing under the effect of spring within the scope of 90 degree; in the time that working machine end occurs transshipping or is stuck; distance L between magnetic conductor rotor and permanent magnet widens rapidly; such two p-m rotor disk bodies 308 compress centrifugal body 309, and support plate II swings 90 degree, the at this moment distance minimum of two p-m rotor disk bodies 308; air gap L maximum; transmission efficiency is now minimum, and motor 1 still can normally move, and has so just realized the overload protection to motor 1.When load restoration is normal, slippage diminishes, and support plate II sets back simultaneously by two p-m rotor disk bodies 308 separately under the effect of spring, and air gap L returns to normal value, and motor 1 can recover driven load voluntarily.
In the time that motor moves, magnetic conductor 306 produces inductive loop while cutting the magnetic induction line of permanent magnet, and active force between the magnetic field of inducing eddy-current and the magnetic field of p-m rotor disk body 308 has produced torque, drive permanent magnet rotating, after load end is connected with the output of power transmission shaft 316, under the driving of p-m rotor disk body 308, be rotated, so just realize the contactless pure machine driving between motor 1 and working machine 2, because input and output adopt contactless magnetic transmission, allow input/output terminal to have the larger error of centralization.
P-m rotor disk body 308 can slide on power transmission shaft 316, and the air gap L between p-m rotor disk body 308 and magnetic conductor 306 (L1+L2 as shown in Figure 2) can change like this.In the time that motor 1 starts, the slippage between motor 1 and working machine 2 is larger, and the variation of air gap L can realize the soft start of motor 1.For fluctuating load, mining distance-limiting type magnetic coupling 3 can regulate by the variation of L, guarantees the transmission efficiency of motor 1.
Input bearing 314, output bearing 313 are fixed the position of power transmission shaft 316, guarantee the gap of power transmission shaft 316 and input mounting disc 305, output mounting disc 311, make flameproof joint III, IV length and gap width reach mine explosion-suppression standard.
Input speed probe 4, output speed probe 5 test the speed by input speed measuring fluted disc 304, output speed measuring fluted disc 315, and the signal of survey is transferred to PLC controller 8 by light division board.Input infrared temperature sensor 6, output infrared temperature sensor 7 are measured the input mounting disc 305 of mining distance-limiting type magnetic coupling 3, the temperature of output mounting disc 311, signal is transferred to PLC controller 8 after by guard grating, and PLC controller 8 is controlled the start and stop of motor 1 by the state of input signal.
The utlity model has following useful effect:
The utility model is applied in colliery scene practice production; some problems that occur in former traditional mechanical type and fluid coupling transmission device are overcome; well solve the transmission problem of on-the-spot reality; transmission efficiency is high and can realize soft starter for motor, motor overload is protected and bears the functions such as the fluctuation of load, can be monitored in real time and carry out failure diagnosis for unusual condition the running status of equipment by long distance control system.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the cutaway view of the mining distance-limiting type magnetic coupling of the utility model;
Fig. 3 is the centrifugal body structure action of the utility model schematic diagram;
Fig. 4 is the utility model monitoring temperature workflow diagram;
Fig. 5 is the testing flow chart of the utility model input and output rotating speed revolutional slip.
In figure: 1, motor; 2, working machine; 3, mining distance-limiting type magnetic coupling; 4, input speed probe; 5, output speed probe; 6, input infrared temperature sensor; 7, output infrared temperature sensor; 8, PLC controller; 9, long distance control system; 301, motor side half plum blossom dish shaft coupling; 302, elasticity plum blossom dish; 303, coupling device end half plum blossom dish; 304, input speed measuring fluted disc; 305, input mounting disc; 306, magnetic conductor; 307, connector; 308, p-m rotor disk body; 309, centrifugal body; 310, fin; 311, output mounting disc; 312, output end cap; 313, output bearing; 314, input bearing; 315, output speed measuring fluted disc; 316, power transmission shaft; 317, permanent magnetic disk axon end-stopping plate.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
As shown in Figure 1, a kind of mining distance-limiting type permanent magnetic transmission device, be arranged between motor 1 and working machine 2, comprise: mining distance-limiting type magnetic coupling 3, input speed probe 4, output speed probe 5, input infrared temperature sensor 6, output infrared temperature sensor 7, PLC controller 8, long distance control system 9, input speed probe 4 detects for the rotating speed of the input to mining distance-limiting type magnetic coupling 3, output speed probe 5 detects for the rotating speed of the output to mining distance-limiting type magnetic coupling 3, input infrared temperature sensor 6 detects for the input temperature to mining distance-limiting type magnetic coupling 3, output infrared temperature sensor 7 detects for the output temperature to mining distance-limiting type magnetic coupling 3, PLC controller 8 respectively with motor 1, input speed probe 4, output speed probe 5, input infrared temperature sensor 6, output infrared temperature sensor 7 connects, long distance control system 9 is connected with the PORT COM of PLC controller 8.
Input speed probe 4, output speed probe 5, input infrared temperature sensor 6, output infrared temperature sensor 7 are monitored in real time to the running status of mining distance-limiting type magnetic coupling 3, signal is transferred to PLC controller 8, PLC controller 8 is controlled the start and stop of motor 1 by the state of input signal, long distance control system 9 can by with PLC controller 8 communications whole device is monitored and failure diagnosis.
As shown in Figure 2, mining distance-limiting type magnetic coupling, by motor side half plum blossom dish shaft coupling 301; , elasticity plum blossom dish 302; , coupling device end half plum blossom dish 303, input speed measuring fluted disc 304, input mounting disc 305, magnetic conductor 306, connector 307, p-m rotor disk body 308, centrifugal body 309, fin 310, output mounting disc 311, output end cap 312, output bearing 313, input bearing 314, output speed measuring fluted disc 315, power transmission shaft 316, permanent magnetic disk axon end-stopping plate 317 form.
In the time that motor moves, magnetic conductor 6 produces inductive loop while cutting the magnetic induction line of permanent magnet, and active force between the magnetic field of inducing eddy-current and the magnetic field of p-m rotor disk body 8 has produced torque, drive permanent magnet rotating, after load end is connected with the output of power transmission shaft 16, under the driving of p-m rotor disk body 8, be rotated, so just realize the contactless pure machine driving between motor 1 and working machine 2, because input and output adopt contactless magnetic transmission, allow input/output terminal to have the larger error of centralization.
P-m rotor disk body 8 can slide on power transmission shaft 16, and the air gap L between p-m rotor disk body 8 and magnetic conductor 6 (L1+L2 as shown in Figure 2) can change like this.In the time that motor 1 starts, the slippage between motor 1 and working machine 2 is larger, and the variation of air gap L can realize the soft start of motor 1.For fluctuating load, mining distance-limiting type magnetic coupling 3 can regulate by the variation of L, guarantees the transmission efficiency of motor 1.
Input bearing 14, output bearing 13 are fixed the position of power transmission shaft 16, guarantee the gap of power transmission shaft 16 and input mounting disc 5, output mounting disc 11, make flameproof joint III, IV length and gap width reach mine explosion-suppression standard.
Input speed probe 4, output speed probe 5 test the speed by input speed measuring fluted disc 4, output speed measuring fluted disc 15, and the signal of survey is transferred to PLC controller 8 by light division board.Input infrared temperature sensor 6, output infrared temperature sensor 7 are measured the input mounting disc 5 of mining distance-limiting type magnetic coupling 3, the temperature of output mounting disc 11, signal is transferred to PLC controller 8 after by guard grating, and PLC controller 8 is controlled the start and stop of motor 1 by the state of input signal.
As shown in Figure 3; support plate II can swing under the effect of spring within the scope of 90 degree; in the time that working machine end occurs transshipping or be stuck, the distance L between magnetic conductor rotor and permanent magnet widens rapidly, and such two p-m rotor disk bodies 8 compress centrifugal body 9; support plate II swings 90 degree; at this moment the distance minimum of two p-m rotor disk bodies 8, air gap L maximum, transmission efficiency is now minimum; motor 1 still can normally move, and has so just realized the overload protection to motor 1.When load restoration is normal, slippage diminishes, and support plate II sets back simultaneously by two p-m rotor disk bodies 8 separately under the effect of spring, and air gap L returns to normal value, and motor 1 can recover driven load voluntarily.
As shown in Figure 4, monitoring temperature workflow diagram, PLC controller 8 divides into groups to temperature signal, mean value in identical time period t is designated as T, start to have n group temperature value from mining distance-limiting type magnetic coupling 3 work like this, in the time of n group temperature value T >=120 ℃, PLC controller 8 can be analyzed this n group temperature value: if the temperature value difference △ T that two adjacent groups n group and n-1 organize at normal temperature difference range △ T0(by great many of experiments gained) in time, the temperature that shows magnetic conductor rotor is the normal rising of ladder, the temperature value that this kind of situation is considered as mining distance-limiting type magnetic coupling 3 is too high, PLC controller 8 will output signal like this, stopping motor 1 moves, equipment is overhauled, if in the temperature value difference △ T subnormal temperature difference range △ T0 of two adjacent groups n group and n-1 group time, be considered as infrared sensor self and break down, image data is wrong, this kind of situation, PLC controller 8 can stop motor 1 and move, and in time infrared sensor is carried out to repair and replacement.
As shown in Figure 5, the testing flow chart of input and output rotating speed revolutional slip, when operation hours t, PLC controller 8 carries out numerical analysis processing to now tach signal n1 and the n2 of input/output terminal, draws revolutional slip η=(n1-n2)/n1.When mining distance-limiting type magnetic coupling 3 moves, just the revolutional slip of incipient stage is larger, and revolutional slip also reaches relative fixed value after stable.When revolutional slip occurs when abnormal, differentiate time end, be likely in the larger situation of firm start-up phase revolutional slip, so this situation will be filtered out.Draw by great many of experiments the time period t 0 that firm start revolutional slip is larger, in the time of revolutional slip η >=4%, running time and t0 compared, if running time t≤t0, illustrate that, in firm start-up phase, revolutional slip belongs to normal condition extremely; If running time t >=t0, illustrate not in firm start-up phase, at this moment input speed n1 is differentiated: if n1 < motor rated speed illustrates that mining distance-limiting type magnetic coupling 3 breaks down appearance extremely, stop motor 1 and move, overhaul; If n1=motor rated speed, illustrates that load end occurs abnormal, mining distance-limiting type magnetic coupling 3 can be according to the adjusting self adaptation of air gap L, and motor normally moves.
Above-described embodiment is only explanation technical conceive of the present utility model and feature, and its object is to allow person skilled in the art can understand content of the present utility model and implement according to this, can not limit protection range of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, within all should being encompassed in protection range of the present utility model.
Claims (7)
1. a mining distance-limiting type permanent magnetic transmission device, be arranged between motor (1) and working machine (2), it is characterized in that, comprising: mining distance-limiting type magnetic coupling (3), input speed probe (4), output speed probe (5), input infrared temperature sensor (6), output infrared temperature sensor (7), PLC controller (8), described input speed probe (4) detects for the rotating speed of the input to mining distance-limiting type magnetic coupling (3), described output speed probe (5) detects for the rotating speed of the output to mining distance-limiting type magnetic coupling (3), described input infrared temperature sensor (6) is for detecting the input temperature of mining distance-limiting type magnetic coupling (3), described output infrared temperature sensor (7) is for detecting the output temperature of mining distance-limiting type magnetic coupling (3), described PLC controller (8) respectively with motor (1), input speed probe (4), output speed probe (5), input infrared temperature sensor (6), output infrared temperature sensor (7) connects.
2. according to the mining distance-limiting type permanent magnetic transmission device of one claimed in claim 1, it is characterized in that, described mining distance-limiting type permanent magnetic transmission device also comprises long distance control system (9), and described long distance control system (9) is connected with the PORT COM of PLC controller (8).
3. according to the mining distance-limiting type permanent magnetic transmission device of one claimed in claim 2, it is characterized in that, described mining distance-limiting type magnetic coupling (3) comprising: shaft coupling, input speed measuring fluted disc (304), magnetic conductor rotor, permanent magnet rotor, power transmission shaft (316), input bearing (314), output bearing (313), output speed measuring fluted disc (315), described magnetic conductor rotor and permanent magnet rotor are set in power transmission shaft (316) outside, described permanent magnet rotor is located at magnetic conductor internal rotor, described magnetic conductor rotor and power transmission shaft (316) are respectively by input bearing (314), output bearing (313) connects, described permanent magnet rotor can be slided along power transmission shaft (316) in magnetic conductor rotor, described shaft coupling is located at the input of power transmission shaft (316) and is connected with magnetic conductor rotor, described input speed measuring fluted disc (304) is sleeved on shaft coupling outside, described output speed measuring fluted disc (315) is sleeved on the output outside of power transmission shaft (316).
4. according to the mining distance-limiting type permanent magnetic transmission device of one claimed in claim 3, it is characterized in that, described shaft coupling is plum blossom disc couplin, and described plum blossom disc couplin is made up of motor side half plum blossom dish shaft coupling (301), elasticity plum blossom dish (302) and coupling device end half plum blossom dish (303); Described input speed measuring fluted disc (304) is sleeved on coupling device end half plum blossom dish (303) outside.
5. according to the mining distance-limiting type permanent magnetic transmission device of one claimed in claim 4, it is characterized in that, described magnetic conductor rotor comprises: input mounting disc (305), output mounting disc (311) and be connected the connector (307) of input mounting disc (305) and output mounting disc (311), described input mounting disc (305) is positioned at input one end of power transmission shaft (316) and is connected with power transmission shaft (316) by input bearing (314), described output mounting disc (311) is positioned at output one end of power transmission shaft (316) and is connected with power transmission shaft (316) by output bearing (313), described input mounting disc (305) and output mounting disc (311) are positioned at permanent magnet rotor one side and are respectively equipped with magnetic conductor (306), described input mounting disc (305) and output mounting disc (311) are respectively equipped with fin (310) away from permanent magnet rotor one side, described input mounting disc (305) and output mounting disc (311) form flameproof joint I and flameproof joint II with connector (307) respectively, described input mounting disc (305) and output mounting disc (311) form flameproof joint III and flameproof joint IV with power transmission shaft (316) respectively.
6. according to the mining distance-limiting type permanent magnetic transmission device of one claimed in claim 5, it is characterized in that, described permanent magnet rotor comprises: two p-m rotor disk bodies (308) and two centrifugal bodies (309), described two p-m rotor disk bodies (308) can slide along power transmission shaft (316) in magnetic conductor rotor, described two centrifugal bodies (309) are positioned between two p-m rotor disk bodies (308), and be located on the p-m rotor disk body (308) of input of close power transmission shaft (316), described two centrifugal bodies (309) are about axial symmetry.
7. according to the mining distance-limiting type permanent magnetic transmission device of one claimed in claim 6, it is characterized in that, described centrifugal body (309) is by orthogonal support plate I, support plate II and be connected support plate I and the spring of support plate II forms, and described support plate I is fixed on p-m rotor disk body (308).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320660670.7U CN203660947U (en) | 2013-10-24 | 2013-10-24 | Mining torque limiting type permanent magnetic transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320660670.7U CN203660947U (en) | 2013-10-24 | 2013-10-24 | Mining torque limiting type permanent magnetic transmission device |
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| Publication Number | Publication Date |
|---|---|
| CN203660947U true CN203660947U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320660670.7U Expired - Fee Related CN203660947U (en) | 2013-10-24 | 2013-10-24 | Mining torque limiting type permanent magnetic transmission device |
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| CN (1) | CN203660947U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560732A (en) * | 2013-10-24 | 2014-02-05 | 煤科集团沈阳研究院有限公司 | Mining load limiting type permanent magnetic transmission device |
-
2013
- 2013-10-24 CN CN201320660670.7U patent/CN203660947U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560732A (en) * | 2013-10-24 | 2014-02-05 | 煤科集团沈阳研究院有限公司 | Mining load limiting type permanent magnetic transmission device |
| CN103560732B (en) * | 2013-10-24 | 2016-06-22 | 煤科集团沈阳研究院有限公司 | A kind of mining distance-limiting type permanent magnetic transmission device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20141024 |
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| EXPY | Termination of patent right or utility model |