CN1870200A - Real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station - Google Patents
Real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station Download PDFInfo
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- CN1870200A CN1870200A CN 200610016964 CN200610016964A CN1870200A CN 1870200 A CN1870200 A CN 1870200A CN 200610016964 CN200610016964 CN 200610016964 CN 200610016964 A CN200610016964 A CN 200610016964A CN 1870200 A CN1870200 A CN 1870200A
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Abstract
A real time monitoring system of box temperature and pressure for high voltage switch hydraulic operation mechanism at converting station is featured as setting on-site monitoring unit with control circuit and heating unit in said box; connecting on-site monitoring unit to industrial bus; forming said control circuit by connecting host circuit with detection circuit, display driving circuit, A/D conversion and temperature transducer circuit, data communication circuit, display control circuit and pressure signal collection circuit; forming heat unit by heater and axial-flow fan as well as shell with air inlet and air outlet.
Description
Technical field
The present invention relates to the control technology field, is a kind of real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station.
Background technology
In recent years, electric power system requires more and more higher to the security reliability of electric equipment operation.Temperature in transformer station's high voltage switch hydraulic operation mechanism case, the correct operation that pressure parameter directly influences switch.Variations in temperature in transformer station's high voltage switch hydraulic operation mechanism case needs in allowed limits, if cross low, hydraulic oil in the hydraulic actuating mechanism can solidify, the concentration that is hydraulic oil is along with variation of temperature can change, this variation may cause the force value of hydraulic actuating mechanism in the case to exceed normal scope, can directly influence the correct operation of operating mechanism; If temperature is too high, can produce oil impregnate, also will influence the operate as normal of operating mechanism.
At present, transformer station's high voltage switch hydraulic operation mechanism case temperature, pressure parameter neither one be monitoring and control device effectively, generally adopt conventional thermometer to come the interior variations in temperature of inspection box (the low chronothermometer of temperature lost efficacy), every day, the operations staff will arrive on-the-spot unpacking the tour.When temperature is low in the winter time, the Field Force adopts casing parcel cotton-wadded quilt and inserts the way of common electric furnace heating wire, artificial manually, the input of timesharing and excision improve the temperature in the case, also increased the hidden danger of device security, personal safety when increasing labour intensity, and power consumption is bigger; Summer, the temperature inside the box was higher, the phenomenon of hydraulic mechanism oil impregnate often taking place, can not in time find, has increased the maintenance workload of equipment, influence the safe operation of equipment, the operations staff can not in time understand the operation conditions of equipment and its running environment is in time adjusted.
Summary of the invention
Technical problem to be solved by this invention is: a kind of real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station is provided, can realize temperature, pressure on-line monitoring and the control of high voltage switch hydraulic operation mechanism case, its precise control, effective, guarantee that the high voltage switch hydraulic operation mechanism action is reliable, safe in utilization.
The technical scheme that solves its technical problem employing is: a kind of real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station, it comprises that remote computer is connected with communications adapter, communications adapter is connected with industrial bus, it is characterized in that, it also is included in built-in on-site supervision device of transformer station's high voltage switch hydraulic operation mechanism case and connected heater, the on-site supervision device is connected on the industrial bus, described on-site supervision device has body, be built-in with control circuit at body, described control circuit by host circuit respectively with testing circuit, display driver circuit, analog-to-digital conversion and temperature sensor circuit, the data communication transmission circuit, Drive and Control Circuit is connected with pressure signal acquisition process circuit; Described heater has housing, is provided with on housing into and out of the air port, is built-in with heater and axial flow blower at housing, and axial flow blower is located at the lower end of heater.
Described host circuit is by singlechip chip IC1, the crystal oscillator XT1 composition that is connected with capacitor C 1, C2.
Described testing circuit is connected with resistance R 1, R2 by watchdog chip IC2 and forms.
Described display driver circuit is connected with charactron LED by display driver chip IC3 and forms.
Described analog-to-digital conversion and temperature sensor circuit are temperature acquisition process chip IC4.
Described data communication transmission circuit is connected with resistance R 3 by data communication transceiving chip IC5 and forms.
Described Drive and Control Circuit is connected with IC9-4 with inverter ic 9-1, IC9-2, IC9-3 respectively by drive controlling chip IC 10 and forms.
Described pressure signal acquisition process circuit is by analog digital conversion chip IC8, operational amplifier IC7-1, the IC7-2 composition that is connected with resistance R 12～R14.
Described power circuit is by power transformer T, rectifier bridge Z, capacitor C 3, C4 and the three terminal regulator IC6 composition that is connected.
The heater of described heater is thermistor pottery PTC.
Real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station of the present invention, owing to adopted remote computer to be connected with communications adapter, communications adapter is connected with industrial bus, at transformer station's high voltage switch hydraulic operation mechanism case built-in on-site supervision device and connected heater, the on-site supervision device is connected in the structure on the industrial bus, and heater has adopted the thermistor heater members, can realize high voltage switch hydraulic operation mechanism case temperature to transformer station, the real time on-line monitoring of pressure, analyze and control automatically, has precise control, effective, guarantee advantages such as the high voltage switch hydraulic operation mechanism action is reliable, and is safe in utilization.Simultaneously also improved the automatic management level of transformer station, but wide popularization and application.
Description of drawings
Fig. 1 is a syndeton block diagram of the present invention.
Fig. 2 is that on-site supervision device and heater are contained in the structural representation in the hydraulic operating mechanism case.
Fig. 3 is that on-site supervision apparatus structure master looks enlarged diagram among Fig. 2.
Fig. 4 is a heater structural upright enlarged diagram among Fig. 2.
Fig. 5 is the control circuit schematic diagram of on-site supervision device.
Fig. 6 is the control relay and the heater assembly connecting circuit schematic diagram of on-site supervision device.
Embodiment
Utilize drawings and Examples that the present invention is further described below.
With reference to Fig. 1 and 2, real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station monitoring and control to as if transformer station's high voltage switch hydraulic operation mechanism case 12 in force value, temperature value and heater 16.The remote computer 9 of real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station is connected with communications adapter 10, communications adapter 10 is connected with industrial bus 11, be built-in with hydraulic operating mechanism 13, on-site supervision device 14 and the heater 15 that is connected with on-site supervision device 14 at transformer station's high voltage switch hydraulic operation mechanism case 12, on-site supervision device 14 is connected on the industrial bus 11.Can several on-site supervision devices 14 with transformer station's high voltage switch hydraulic operation mechanism case 12 of on-site supervision device 14 and heater 15 be connected on the industrial bus 11 according to user's needs, the model of industrial bus 11 adopts RS-485, realize temperature, pressure on-line monitoring and the control of all high voltage switch hydraulic operation mechanism cases 12 in the transformer station, it supports multinode communication, long transmission distance, receiving sensitivity is higher.RS-485 adopts balance to send, and differential received realizes communication, and adopts Shielded Twisted Pair as communication media, and the ability of stronger anti-common mode disturbances is arranged.The field digital signal is connected with remote computer 9 and needs level conversion; the RS232/RS485 transducer that communications adapter 10 selects for use Wuhan boss electronics corporation to produce; anti-lightning strike protection device of built-in 600W and 1500V antistatic protection device, transmission range reaches 1800 meters, guarantees the reliability service of system.
With reference to Fig. 3, terminal L, the N that is provided with on the body 21 of supervising device 14 is the alternating current 220V power supply at the scene; Terminal A, B are the terminal that connects industrial bus 11; Terminal V+, COM are the pressure sensor signal input; Terminal K1+, K1-are that axial flow blower 17 starts contact; K2+, K2-, K3+, K3-, K4+, K4-are that heater 16 starts contact; FG is the unit protection earth terminal.
With reference to Fig. 4, heater 15 has housing 18, is provided with into and out of the air port 19,20 on housing 18, is built-in with heater 16 and axial flow blower 17 at housing 18, and axial flow blower 17 is located at the lower end of heater 16.Heater 16 is a thermistor pottery PTC pyrotoxin.Adopt three grades of heating by on-site supervision device 14 according to on-site actual situations, effectively utilize thermal source.Heater 16 is the semiconductor functional ceramic PTC that a class has positive temperature coefficient, and before transition temperature, thermistor descends with the rising of temperature, temperature is from transition temperature, and thermistor raises with temperature and significantly increases, under the situation of certain heat efficiency, electric current is less, obvious energy conservation.The thermistor pottery PTC pyrotoxin of present embodiment adopts 3 * 800W power, and thermistor pottery PTC, axial flow blower 17 are the commercially available prod.
With reference to Fig. 5, the control circuit of on-site supervision device 14 is connected with testing circuit 2, display driver circuit 3, analog-to-digital conversion and temperature sensor circuit 4, data communication transmission circuit 5, Drive and Control Circuit 6 and pressure signal acquisition process circuit 7 respectively by host circuit 1.Power circuit 8 is by power transformer T, rectifier bridge Z, capacitor C 3, C4 and the three terminal regulator IC6 composition that is connected.Power circuit 8 is host circuit 1, testing circuit 2, display driver circuit 3, analog-to-digital conversion and temperature sensor circuit 4, data communication transmission circuit 5, Drive and Control Circuit 6 and 7 power supplies of pressure signal acquisition process circuit.
The host circuit 1 of on-site supervision device 14 control circuits, testing circuit 2, display driver circuit 3, analog-to-digital conversion and temperature sensor circuit 4, data communication transmission circuit 5 are contained on the circuit board; Drive and Control Circuit 6, pressure signal acquisition process circuit 7 and power circuit 8 are contained on another piece circuit board.Connect by two connectors of G1, G2 respectively between the two boards.
Described host circuit 1 is by singlechip chip IC1, and the crystal oscillator CR1 composition that is connected with capacitor C 1, C2 is finished the function of on-site supervision device 14 data operations, data processing, control logic, function expansion.It is 8 single-chip microcomputers of AT89C51 that singlechip chip IC1 adopts model.The outer crystal oscillator XT1 two ends of the sheet that the pin X1 of singlechip chip IC1 and X2 are connected to 12M, capacitor C 1, C2 are 30pf.The outer crystal oscillator XT1 of sheet and capacitor C 1, C2 form oscillator, and the operating frequency of system is provided.
Described testing circuit 2 is connected with resistance R 1, R2 by watchdog chip IC2 and forms.Watchdog chip IC2 adopts model X25045, it has WatchDog Timer, voltage monitoring and E2PROM function, (+the resistance R 1 that 5V) meets 10K is finished complex potential to the pin RESET of singlechip chip IC1 by VCC, if watchdog chip IC2 is not conducted interviews in setting-up time during system works, then singlechip chip IC1 pin RESET becomes high level and makes system reset.3 pin of watchdog chip IC2 through the resistance R 2 of 10K connect+5V allows write operation.1 pin of watchdog chip IC2 is connected as chip selection signal with the pin P1.0 of the singlechip chip IC1 of host circuit 1, and 2 pin of watchdog chip IC2 are connected the input and output of control data with the pin P2.2 of the singlechip chip IC1 of host circuit 1.5 pin of watchdog chip IC2 are connected as serial data with the pin P2.0 of the singlechip chip IC1 of host circuit 1 to be imported, 6 pin of watchdog chip IC2 are connected as serial clock with the pin P2.1 of the singlechip chip IC1 of host circuit 1 to be imported, the pin of the singlechip chip IC1 of host circuit 1 carries out read-write operation to watchdog chip IC2 under the control of 6 pin of watchdog chip IC2, watchdog chip IC2 inside 512 * 8 byte spaces are provided with parameter definite value storage usefulness as on-site supervision device 14, have the function that power down is preserved.
Described display driver circuit 3 is connected with charactron LED by display driver chip IC3 and forms.Chip for driving IC3 adopts the drive circuit of the Intersil model ICM7218B of company as the LED charactron, need not add current-limiting resistance and clock, includes position and segment drive circuit and dynamic scan control circuit.Control 4 positions of charactron LED respectively by 4 pin, 25 pin, 3 pin, 1 pin of chip for driving IC3,16,17,20,18,21,22,23,15 pin of chip for driving IC3 meet 7 sections and the decimal point DP of A, B, C, D, E, F, the G correspondence of LED charactron respectively.5 of chip for driving IC3,6,7,10,11,12,13, data wire P0.0～P0.7 mouth of 14 pin order sheet machine chip IC1, driving force for data wire P0.0～P0.7 mouth of improving singlechip chip IC1, it is respectively R4 that every data wire adds a pull-up resistor, R5, R6, R7, R8, R9, R10, R11, resistance value is 10K, the pin P2.7 of the 9 pin order sheet machine chip IC1 of chip for driving IC3 is as control end, 8 pin of chip for driving IC3 are connected as data input pin with the pin WR of singlechip chip IC1, write data presented under the 9 foot control systems of chip for driving IC3.
Described analog-to-digital conversion and temperature sensor circuit 4 are temperature acquisition process chip IC4.Temperature acquisition process chip IC4 adopts the model AD7416 of U.S. AD company as on-the-spot analog-to-digital conversion and temperature sensor circuit, and chip integration becomes 10 A/D analog to digital converters of serial and digital temperature sensor, scope-55 ℃～125 ℃, and precision is 0.25 ℃.5,6,7 pin of temperature acquisition process chip IC4 are the programmable address line, all link together with ground wire GND in the circuit, make temperature acquisition process chip IC4 be in strobe state all the time, 1 pin of temperature acquisition process chip IC4 is connected the serial-port as the data input and output with the pin P1.2 of singlechip chip IC1,2 pin of temperature acquisition process chip IC4 are connected with the pin P1.1 of singlechip chip IC1 as numeral read-write serial clock, carry out data read-write operation under its control.
Described data communication transmission circuit 5 is connected with resistance R 3 by data communication transceiving chip IC5 and forms.Adopt model 75LBC184 to finish the function of transfer of data communication as anti-thunderbolt RS-485 industrial bus 11 transceivers; A, B pin are connected to high-energy transition interference protection device in the data communication transceiving chip IC5 sheet; this structure can be born the overvoltage transition that peak value is 400W (representative value) (as thunder and lightning, static discharge and alternating current fault), thereby has improved the reliability of the anti-overvoltage transition of device significantly.Can be directly and transmission line join and without any need for adding protection component.1 pin of data communication transceiving chip IC5 is connected with the RXD of singlechip chip IC1 through the pull-up resistor R3 of 10K, 4 pin of data communication transceiving chip IC5 are connected acceptance and the transmission of finishing data with the TXD of singlechip chip IC1,2 pin of data communication transceiving chip IC5 are connected the T1 foot control system transceiving driver of singlechip chip IC1 with 3 pin short circuits, 6,7 pin of data communication transceiving chip IC5 are connected with A, the B terminal of the body 15 of on-site control device 14 respectively and are suspended on the industrial bus 11.
Described Drive and Control Circuit 6 is connected with IC9-4 with inverter ic 9-1, IC9-2, IC9-3 respectively by drive controlling chip IC 10 and forms.The model of drive controlling chip IC 10 is ULN2003, and the model of inverter ic 9-1, IC9-2, IC9-3 and IC9-4 is 74LS04.The control command that singlechip chip IC1 sends is finished by pin P1.3～P1.6 respectively, pin P1.3～P1.6 of singlechip chip IC1 meets inverter ic 9-1 respectively, IC9-2,9 pin of IC9-3 and IC9-4,5 pin, 3 pin and 13 pin, inverter ic 9-1, IC9-2, output 8 pin of IC9-3 and IC9-4,6 pin, 4 pin, 12 pin connect 5 pin of drive controlling chip IC 10,4 pin, 3 pin, 2 pin, relay K 1, K2, K3, K4 connects 12～15 pin of drive controlling chip IC 10 respectively, ULN2003 is the drive circuit of darlington structure, pin P1.3～P1.6 of singlechip chip IC1 is not a high level when having control command, and wherein a certain position drives the corresponding actuating of relay when becoming low level.
Described pressure signal acquisition process circuit 7 is by analog digital conversion chip IC8, and operational amplifier IC7-1, IC7-2 are connected with resistance R 12～R14 and form.The model of analog digital conversion chip IC8 is TLC1549, and the model of operational amplifier IC7-1, IC7-2 is LF347.Pressure signal is inserted the V+ of on-site supervision device 14 by on-the-spot pressure transmitter, the COM end, on-the-spot voltage signal is through operational amplifier IC7-1, IC7-2 carries out signal transformation, 1 pin of operational amplifier IC7-1,2 pin, 3 pin, the resistance R 12 of 10K, the resistance R 13 of 5K and the resistance R of 10K 14 are formed arithmetic element, 5 pin of operational amplifier IC7-2,6 pin, 7 pin composition is penetrated grade follower and is improved a load capacity, analog digital conversion chip IC8 is 10 analog-digital converters of serial, 7 pin of operational amplifier IC7-2 insert 2 pin of analog digital conversion chip IC8 and import as analog quantity, 1 pin of analog digital conversion chip IC8,4 pin are reference voltage, connect respectively in the circuit+5V and GND, chip selection signal is connected to the pin P2.6 of singlechip chip IC1 by connector G2,7 pin of analog digital conversion chip IC8 are the input and output clock, the pin T0 that is connected to singlechip chip IC1 by connector G2 holds, and carries out data write under its control again.6 pin of analog digital conversion chip IC8 are data output end, and the P1.7 by connector G2 is connected to the pin of singlechip chip IC1 send the data that convert singlechip chip IC1 to handle.
Described power circuit 8 is by power transformer T, rectifier bridge Z, capacitor C 3, C4 and the three terminal regulator IC6 composition that is connected.Electric power loop 8 is a linear power supply, and power transformer T is 2W, 220/8.5V, and capacitor C 3 is electrochemical capacitor 1000uf/50V, and capacitor C 4 is the only real electric capacity of 0.1uf/50V, and the model of three terminal regulator IC6 is selected LM7805 for use.
With reference to Fig. 6, K1, K2, K3, K4 are the control relay of on-site supervision device 14 among the figure, start built-in control switch J1, J2, J3, the J4 of housing 18 of heater 15 by its.K1 when winter, high voltage switch hydraulic operation mechanism case 12 interior temperature were lower than set point, the K4 closure, start one group of thermistor pottery PTC and axial flow blower 17 simultaneously, hot blast is taken out of by blower fan, heat circulates in high voltage switch hydraulic operation mechanism case 12, high voltage switch hydraulic operation mechanism case 12 interior devices are heated evenly, temperature does not reach when requiring in the high voltage switch hydraulic operation mechanism case 12, order delayed startup K2, K3 starts J2, J3 make temperature in the high voltage switch hydraulic operation mechanism case 12 satisfy the normal range of operation of operating mechanism with the two or three group of thermistor pottery PTC, when temperature is higher than set point, excise thermistor pottery PTC in proper order, make to keep certain temperature range in the high voltage switch hydraulic operation mechanism case 12.When summer, high voltage switch hydraulic operation mechanism case 12 interior temperature were higher than the high temperature set point, have only K4, J4 closure, K1, K2, K3 contact are opened, and start axial flow blower 17, and hydraulic operating mechanism in the high voltage switch hydraulic operation mechanism case 12 is carried out natural wind circulation cooling heat dissipation.Can carry out long-range fixed value modification, long-range heater 16 be controlled according to the work on the spot needs.Working out according to automatic control technology and microcomputer data processing about the software program of real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station, is the technology that those skilled in the art are familiar with.
Claims (10)
1. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station, it comprises that remote computer is connected with communications adapter, communications adapter is connected with industrial bus, it is characterized in that: further comprising at transformer station's high voltage switch hydraulic operation mechanism case built-in on-site supervision device and connected heater, the on-site supervision device is connected on the industrial bus, described on-site supervision device has body, be built-in with control circuit at body, described control circuit by host circuit respectively with testing circuit, display driver circuit, analog-to-digital conversion and temperature sensor circuit, data communication is received the section circuit, Drive and Control Circuit is connected with pressure signal acquisition process circuit; Described heater has housing, is provided with on housing into and out of the air port, is built-in with heater and axial flow blower at housing, and axial flow blower is located at the lower end of heater.
2. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1 is characterized in that: described host circuit is by singlechip chip (IC1), crystal oscillator (XT1) composition that is connected with electric capacity (C1, C2).
3. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1 is characterized in that: described testing circuit is connected and forms with resistance (R1, R2) by watchdog chip (IC2).
4. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1 is characterized in that: described display driver circuit is connected with charactron (LED) by display driver chip (IC3) and forms.
5. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1 is characterized in that: described analog-to-digital conversion and temperature sensor circuit are temperature acquisition process chip (IC4).
6. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1 is characterized in that: described data communication transmission circuit is connected with resistance (R3) by data communication transceiving chip (IC5) and forms.
7. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1 is characterized in that: described Drive and Control Circuit is connected and forms with inverter (IC9-1, IC9-2, IC9-3, IC9-4) respectively by drive controlling chip (IC10).
8. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1, it is characterized in that: described pressure signal acquisition process circuit is by analog digital conversion chip (IC8), and (R12～R14) is connected and forms for operational amplifier (IC7-1, IC7-2) and resistance.
9. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1, it is characterized in that: described power circuit is by power transformer (T), rectifier bridge (Z), electric capacity (C3, the C4) composition that is connected with three terminal regulator (IC6).
10. real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station according to claim 1 is characterized in that: the heater of described heater is thermistor pottery (PTC).
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| CN 200610016964 CN1870200A (en) | 2006-06-20 | 2006-06-20 | Real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station |
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| CN 200610016964 CN1870200A (en) | 2006-06-20 | 2006-06-20 | Real-time monitoring system for temp pressure of high voltage switch hydraulic operation mechanism box of converting station |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957620A (en) * | 2009-07-20 | 2011-01-26 | 朱安民 | Numerical control and hydraulic equipment long-range control and fault diagnosis technology |
| CN102610080A (en) * | 2011-01-24 | 2012-07-25 | 佳木斯大学 | Fieldbus based 64-channel coal-mine gas measuring transmitter |
| CN103034264A (en) * | 2011-09-30 | 2013-04-10 | 北大方正集团有限公司 | Temperature controlling device |
| JP2017010873A (en) * | 2015-06-25 | 2017-01-12 | 株式会社東芝 | Monitor system for hydraulic operation mechanism for breaker, and monitoring method therefor |
| CN110836749A (en) * | 2019-11-28 | 2020-02-25 | 西安交通大学 | Remote monitoring system for leakage state of hydraulic operating mechanism |
-
2006
- 2006-06-20 CN CN 200610016964 patent/CN1870200A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957620A (en) * | 2009-07-20 | 2011-01-26 | 朱安民 | Numerical control and hydraulic equipment long-range control and fault diagnosis technology |
| CN102610080A (en) * | 2011-01-24 | 2012-07-25 | 佳木斯大学 | Fieldbus based 64-channel coal-mine gas measuring transmitter |
| CN103034264A (en) * | 2011-09-30 | 2013-04-10 | 北大方正集团有限公司 | Temperature controlling device |
| CN103034264B (en) * | 2011-09-30 | 2015-11-25 | 北大方正集团有限公司 | Attemperating unit |
| JP2017010873A (en) * | 2015-06-25 | 2017-01-12 | 株式会社東芝 | Monitor system for hydraulic operation mechanism for breaker, and monitoring method therefor |
| CN110836749A (en) * | 2019-11-28 | 2020-02-25 | 西安交通大学 | Remote monitoring system for leakage state of hydraulic operating mechanism |
| CN110836749B (en) * | 2019-11-28 | 2021-01-15 | 西安交通大学 | Remote monitoring system for leakage state of hydraulic operating mechanism |
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