CN202048339U - Automatic lubricating pressure control device - Google Patents
Automatic lubricating pressure control device Download PDFInfo
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- CN202048339U CN202048339U CN2011201195136U CN201120119513U CN202048339U CN 202048339 U CN202048339 U CN 202048339U CN 2011201195136 U CN2011201195136 U CN 2011201195136U CN 201120119513 U CN201120119513 U CN 201120119513U CN 202048339 U CN202048339 U CN 202048339U
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Abstract
An automatic lubricating pressure control device belongs to the control field, comprises an oil pump operating control circuit, and is characterized in that: a pressure variation smooth module of a main pipe is arranged at a spare pump start/stop control circuit of the oil pump operating control circuit; the pressure variation smooth module of the main pipe comprises a first delay unit which is arranged in a detection circuit when the pressure of the main pipe is too low and a second control unit which is arranged in the spare pump start/stop control circuit; and the first delay unit detects the output result of the detection circuit according to the low pressure conditions of the main pipe to control the second control unit, and the second control unit controls the spare pump start/stop control circuit according to the output result of the first delay unit. The automatic lubricating pressure control device can prevent the main and the spare lubrication pumps from being frequently switched with each other when the pressure of the main pipe is close to the set value of the lower limit of the oil pressure, the pressure of the main oil supply pipe is stabilized, the investment and the maintenance cost of the whole device are lower, and the implementation and application obtain good effects. The automatic lubricating pressure control device can be widely applied in the control field of a lubricating oil pressure supply system.
Description
Technical field
The utility model belongs to the control field, relates in particular to a kind of control gear that is used for lubricating oil pressure control.
Background technique
Existing large and medium-sized machine operation equipment/unit, usually be provided with one group " oil station ", this oil station is used to provide lubricant oil with certain pressure each lubricating point to equipment/unit, and has lubricating oil pipeline pressure control and regulatory function, also has the filtering function to lubricant oil.
This type of oil station self oiling control gear is equipped with two low pressure fuel pumps, a job, one standby (being called " the using and the reserved " traditionally) usually.For the needs of control system aspect, before equipment/unit puts into operation, need at first to determine/specify one in the above-mentioned two table oil pumps in the control mode at oil station and be " work oil pump ".
Under working oil pump work situation, if lubricant oil feeding pipe road system (being designated hereinafter simply as system) underpressure, when pressure dropped to oil pressure limit inferior setting value, emergency bearing oil pump started automatically, and sent acoustooptic alarm.
If system pressure returns to oil pressure limit inferior pressure set points when above, emergency bearing oil pump is out of service automatically; Otherwise after if emergency bearing oil pump is opened, system pressure continues to descend, and during the limit inferior pressure set points, control system is sent " hypotony " accident alarming under dropping to oil pressure.
The above-mentioned method of operation is called as " automatically " method of operation.
But in the oil pump running of actual oil station; insecure phenomenon when regular meeting's generation oil pump is in " automatically " operation; it shows as when system pressure drops to oil pressure limit inferior setting value; emergency bearing oil pump and main oil pump can often switch startup back and forth; cause the system pipeline pressure surge big, the need lubricating utensil is impacted.
Trace it to its cause is that startup, running and the stop condition of above-mentioned lubricating pump controlled, specifically controlled by the main pipe pressure switch according to main fuel supply line (hereinafter to be referred as be responsible for) pressure.When main pipe pressure is lower than oil pressure limit inferior pressure set points, pressure switch closure/connection, oil pump starts automatically; And returning to oil pressure limit inferior pressure set points when above when main pipe pressure, oil pump stops automatically; But because main pipe pressure runs into when fuel feeding when stopping up in the pipe, system pressure can often change, and the build-up of pressure switch is also followed the state of being switched on or switched off, and makes oil pump frequently rise/stop, and forms a kind of " vibration " phenomenon.
The day for announcing is on January 9th, 2008, notice of authorization number is the utility model patent of CN 201003679Y, a kind of " distributed automatic lubricating device " disclosed, it includes upper HMI man-machine interface, controller, conversion adapter, on-the-spot oil supply machine and communication system, upper HMI man-machine interface is by process control machine or industrial workstation, systems soft ware, application program constitutes, controller is made of programmable controller PLC, conversion adapter is arranged between controller and each the on-the-spot oil supply machine, dispose reusable oil storage cup on the body of on-the-spot oil supply machine, be set directly at the working site of each lubricating point.
Its under the control of upper HMI man-machine interface with constant compression force, carry out automatic repairing regularly, quantitatively, set and adjust the parameters such as operation cycle of each on-the-spot oil supply machine by upper HMI man-machine interface, monitor the running state of each on-the-spot oil supply machine, related work bearing and whole lubricating system.
This technological scheme subject matter to be solved provides a kind of benefit fat cycle, benefit fat amount and the institute's repairing lipid amount three big main points that can take into account simultaneously in the rolling bearing lubricating maintenance, the bearing working state of each lubricating point is had the distributed automatic lubricating device of real time automatic detection and information feedback function.
But the control system part one-time investment cost of this cover control apparatus is bigger, and relatively be applicable to the occasion that adopts lubricating grease to be lubricated, and the equipment/unit to adopting lubricant oil to be lubricated there is no need to adopt so senior control mode or control gear.
The model utility content
Technical problem to be solved in the utility model provides a kind of self oiling pressure control device, it can avoid the frequent switching of lubricating pump at main pipe pressure active/standby lubricating pump during near the oil pressure lower limit set value, prevent that lubricant pump from because of frequently rise/stopping, playing pressure stabilization function to oil supply bar's pressure.
The technical solution of the utility model is: a kind of self oiling pressure control device is provided, comprise two oil pumps of constituting by two table oil pumps oil pump running control circuit of standby equipment unit each other, it is characterized in that: the stand by pump at described oil pump running control circuit plays/stops control loop, main pipe pressure is set changes level and smooth module; Described main pipe pressure changes level and smooth module and comprises that being arranged on main pipe pressure condition on the low side detects first delay unit in the loop and be arranged on stand by pump second control unit that rises/stop in the control loop; Described first delay unit is controlled second control unit according to the output result in main pipe pressure condition detection on the low side loop, and described second control unit is controlled stand by pump and played/stop control loop according to the output result of first delay unit.
Its described first delay unit comprises time delay relay and auxiliary contact thereof, and described second control unit comprises auxiliary reclay and auxiliary contact thereof.
After the control coil of described time delay relay is connected in series the first pressure detecting signal contact, with the two ends corresponding connection respectively of control power supply; First contact of described time delay relay, serial connection is arranged in second control unit.
Concrete, after the control coil of described auxiliary reclay is connected in series first contact of described time delay relay, with the two ends corresponding connection respectively of control power supply; Described auxiliary reclay often drive auxiliary contact, serial connection is arranged in the stand by pump start-up control loop.
Wherein, the described first pressure detecting signal contact is to be arranged on the main pipe pressure output signal on the low side that first pressure switch on the system pipeline is exported.
Described first contact is for often driving the time-delay break contact.
Further, the end of described time delay relay control coil SJ, is connected with the N end of control power supply with the corresponding connection of 101 ends of control power supply, the other end of time delay relay control coil SJ through the first pressure detecting signal contact SP1; The end of described auxiliary reclay control coil ZJ, is connected with the N end of control power supply with the corresponding connection of 101 ends of control power supply, the other end of auxiliary reclay control coil ZJ through the first contact SJ-1 of described time delay relay; Described auxiliary reclay is often opened the end of auxiliary contact ZJ-1, be connected with the 18th end of selective switchgear SA1, the other end of auxiliary contact ZJ-1 often left by auxiliary reclay, through Oil pump electrical machinery major loop contactor interlock circuit and Oil pump electrical machinery major loop contactor coil KM, be connected with the N end of control power supply.
Simultaneously, described main pipe pressure changes level and smooth module and comprises the 3rd alarm unit, and described alarm unit is arranged on main pipe pressure and crosses in the low condition detection loop.
Its described the 3rd alarm unit comprises sound, light warning device.
Concrete, described the 3rd alarm unit comprises buzzer FM and the 3rd signaling lamp HL3, the one end is crossed low-output signal contact SP2 through being arranged on the main pipe pressure that second pressure switch on the system pipeline exports after described buzzer and the 3rd signaling lamp parallel connection, the corresponding connection of 101 ends with the control power supply, the other end after buzzer and the signaling lamp parallel connection is connected with the N end of control power supply.
Compared with the prior art, the utility model has the advantages that:
1. by adopting the self oiling pressure control device, can avoid lubricating pump main pipe pressure during near the oil pressure lower limit set value active/standby lubricating pump frequently switch, oil supply bar's pressure is played pressure stabilization function;
2. the investment of whole device and maintenance cost are cheaper, are applied to sleeve kiln owner air bells exhauster thin oil pump lubrication system, have obtained good effect.
Description of drawings
Fig. 1 is existing two standby each other oil pump running control circuit of oil pump;
Fig. 2 is a circuit structure module diagram of the present utility model;
Fig. 3 is a circuit interconnect pattern of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
That Fig. 1 provides is the standby each other oil pump operation control principle figure of existing two oil pump.
When selecting the throw over switch SA1 right side to select 45 °, represent No. 1 oil pump work, No. 2 oil pump is standby, locates the corresponding respectively connection of contact sets for 1,2 of selective switchgear SA1 liang in the schematic diagram.
DCS interface this moment (seeing circuit No. 07) is connected, and contactor KM1 coil gets electric (seeing circuit No. 06), major loop closure (see circuit L11, L12, L13 number), No. 1 Oil pump electrical machinery work.
In the running, as be responsible for oil pressure pressure and diminish, when less than the first setting value SP1 value, this moment the first pressure switch SP1 closure, relay K A1 coil (seeing line number 21), its auxiliary contact (seeing line number 18) connection KM2 contactor coils (seeing line number 16) get electric, No. 2 stand by pump work.
Oil pressure pressure is normal when being responsible for, during greater than the first setting value SP1 value, this moment, the first pressure switch SP1 disconnected, relay K A1 coil (seeing line number 21) dead electricity, its auxiliary contact (seeing line number 18) disconnect KM2 contactor coil (seeing line number 16) dead electricity, and No. 2 stand by pump quits work.
Stop up sometimes owing to be responsible for oil pressure in the fuel feeding process, produce fluctuation, particularly be in the transition point of the first pressure switch SP1 setting value when neighbouring when system's charge oil pressure, above-mentioned schematic diagram can cause stand by pump to start or stop back and forth.The equipment that influences normally moves.
Because this figure adopts standard plotting mode in the industry, those skilled in the art all can understand and understand control logic relation and the control action process that this figure will represent undoubtedly, so it adopts the implication of various symbols and mark to be not described in detail in this.
Among Fig. 2, the self oiling pressure control device of the technical program, comprise two oil pumps of constituting by two table oil pumps oil pump running control circuit of standby equipment unit each other, its inventive point is to play/stop control loop at stand by pump, is provided with main pipe pressure and changes level and smooth module (part that dashed rectangle is enclosed among the figure).
Main pipe pressure changes level and smooth module and comprises that being arranged on main pipe pressure condition on the low side detects first delay unit in the loop and be arranged on stand by pump second control unit that rises/stop in the control loop.
As seen from the figure, described first delay unit is controlled second control unit according to the output result in main pipe pressure condition detection on the low side loop; Described second control unit is according to the output result of first delay unit, controls stand by pump and rise/stop the operation of control loop.
Concrete, the first above-mentioned delay unit comprises time delay relay and auxiliary contact thereof, the second above-mentioned control unit comprises auxiliary reclay and auxiliary contact thereof.
Further, after the control coil of time delay relay is connected in series the first pressure detecting signal contact, with the two ends corresponding connection respectively of control power supply; Simultaneously, first contact of time delay relay, serial connection is arranged in second control unit.
Behind first contact of the control coil serial connection time delay relay of auxiliary reclay, with the two ends corresponding connection respectively of control power supply; Auxiliary reclay often drive auxiliary contact, serial connection is arranged in the stand by pump start-up control loop.
Fairly obvious, emergency bearing oil pump rise/stop in the control circuit main pipe pressure that is made of first delay unit and second control unit be set change level and smooth module after, in the fuel feeding process if when being responsible for oil pressure and being in the first pressure set points transition point, (for example give certain hour by delay circuit, tens of seconds) time-delay, as system pipeline oil pressure in this section delay time section always greater than first pressure set points, the then not conducting of contact of the first pressure detecting signal contact, standby air pump inoperative, be lower than first pressure set points as oil pressure in this section delay time section always, the then contact conducting of the first pressure detecting signal contact, stand by pump puts into operation, starts working.
By this self oiling pressure control device is installed, can avoid the frequent switching of lubricant oil main pipe pressure active and standby lubricating pump when the first pressure set points transition point, oil supply bar's pressure has been played pressure stabilization function, avoided the generation of " vibration " phenomenon.
Simultaneously, above-mentioned main pipe pressure changes level and smooth module also can comprise the 3rd alarm unit, and this alarm unit is arranged on main pipe pressure and crosses in the low condition detection loop.
Its 3rd alarm unit is sound, light warning device.
If the system pipeline oil pressure continues to descend after being lower than first pressure set points, even stand by pump still (for example can not satisfy the system pressure requirement after starting, when serious obstruction or significant leakage fault appear in system), after being lower than second pressure set points, then the 3rd alarm unit is reported to the police, send sound/optical signal, remind the staff to note, in time handle.
Among Fig. 3, this self oiling pressure control device comprises that being arranged on main pipe pressure condition on the low side detects first delay unit in the loop and be arranged on stand by pump second control unit that rises/stop in the control loop.
Its first delay unit comprises time delay relay SJ and auxiliary contact thereof, and second control unit comprises intermediate relay ZJ and auxiliary contact thereof.
The end of time delay relay control coil SJ, is connected with the N end of control power supply with the corresponding connection of 101 ends of control power supply, the other end of time delay relay control coil SJ through the first pressure detecting signal contact SP1.
The end of auxiliary reclay control coil ZJ, is connected with the N end of control power supply with the corresponding connection of 101 ends of control power supply, the other end of auxiliary reclay control coil ZJ through the first contact SJ-1 of described time delay relay.
The end of auxiliary contact ZJ-1 often left by auxiliary reclay, be connected with the 18th end of selective switchgear SA1, the other end of auxiliary contact ZJ-1 often left by auxiliary reclay, through Oil pump electrical machinery major loop contactor interlock circuit and Oil pump electrical machinery major loop contactor coil KM, be connected with the N end of control power supply.
This self oiling pressure control device also can comprise the 3rd alarm unit, and its 3rd alarm unit comprises buzzer FM and the 3rd signaling lamp HL3.
As seen from the figure, the one end is crossed low-output signal contact SP2 through being arranged on the main pipe pressure that second pressure switch on the system pipeline exports after buzzer and the 3rd signaling lamp parallel connection, the corresponding connection of 101 ends with the control power supply, the other end after buzzer and the signaling lamp parallel connection is connected with the N end of control power supply.
Embodiment:
The original control wiring schematic diagram of contrast Fig. 1, at first remove standby control pump relay K A1 (seeing Fig. 1 line number 21) and hypotony relay K A2 (seeing Fig. 1 line number 22) in its low-voltage power distributing cabinet, meet digital time relay SJ in line number 21 positions, its model is JS14P-2/220, select AC220V for use, on-delay, delay time 1~99 second now is set at 40S.
Meet buzzer FM in line number 22 positions, model is AD16-22SM/231 220V/5W, and tutorial light HL3 in parallel, and model is APT AD16-22B AC220V.
Then, improve control principle figure line number 101 places, back at Fig. 3 and meet digital time relay SJ normally opened contact SJ_1, connect the coil of intermediate relay ZJ at SJ_1 the other end point line number 24 places, its model is JZ7-80 AC220V, another termination of intermediate relay ZJ coil N line.
At the former control wiring schematic diagram of Fig. 1 KA1 line number 18 places, be replaced by intermediate relay ZJ auxiliary contact ZJ_1 (seeing figure three line numbers 18), the former control wiring schematic diagram of Fig. 1 KA1 line number 8, be replaced by intermediate relay ZJ auxiliary contact ZJ_2 (seeing Fig. 3 line number 8), more than finished more changing device of hardware.
Lubricating pump on-the-spot throw over switch SA1 of when work selects 45 ° in the right side, shows pump work No. 1, and No. 2 pump is standby, then in Fig. 3 schematic diagram 1,2 liang of SA1 locate to be communicated with.
DCS interface this moment (seeing circuit No. 07) is connected, and contactor KM1 coil gets electric (seeing circuit No. 06), major loop closure (see circuit L11, L12, L13 number), No. 1 pump motor work.
In the running, stop up oil pressure pressure and diminish, near the first pressure switch setting value SP1 transition point time, between this moment pressure switch SP1 closure or disconnect, be connected in series wherein time relay sj and start working as being responsible for oil pipe.
As oil pressure in 40 seconds always greater than the SP1 setting value, the then not conducting of auxiliary contact SJ_1 that carries of time relay sj, auxiliary reclay coil ZJ must not electricity (seeing line number 24), and it carries auxiliary contact ZJ_1 (seeing line number 18), be in off state, standby air pump inoperative.
Be lower than the SP1 setting value as oil pressure in 40 seconds always, the then auxiliary contact SJ_1 conducting that carries of time relay sj, auxiliary reclay coil ZJ gets electric (seeing line number 24), and it carries auxiliary contact ZJ_1 (seeing line number 18), is in on-state, stand by pump work.
Be lower than low oil pressure setting value SP2 (being the aforesaid second pressure switch setting value) if be responsible for oil pressure, then this moment, SP2 connected, and buzzer FM sounding, and tutorial light HL3 in parallel flicker are reminded the Field Force.
As oil pressure in 40 seconds in the fluctuation of SP1 setting value, the then not conducting of auxiliary contact SJ_1 that carries of time relay sj, intermediate relay ZJ must not electricity (seeing line number 24), it carries auxiliary contact ZJ_1 (seeing line number 18), is in off state, standby air pump inoperative.
Clearly, adopt this self oiling pressure control device, can avoid the frequent switching of lubricating pump at main pipe pressure active and standby lubricating pump during near the oil pressure lower limit set value, also can prevent from frequently to rise/stop because of lubricant pump, the adverse effect that causes oil supply bar's pressure surge to be produced, and investment and maintenance cost are very low, have obtained good operational effect after actual input enforcement and the use.
The utility model can be widely used in the control field of lubricating oil pressure oil supply system.
Claims (10)
1. self oiling pressure control device comprises two oil pumps of being made of two table oil pumps oil pump running control circuit of standby equipment unit each other, it is characterized in that:
Stand by pump at described oil pump running control circuit plays/stops control loop, main pipe pressure is set changes level and smooth module;
Described main pipe pressure changes level and smooth module and comprises that being arranged on main pipe pressure condition on the low side detects first delay unit in the loop and be arranged on stand by pump second control unit that rises/stop in the control loop;
Described first delay unit is controlled second control unit according to the output result in main pipe pressure condition detection on the low side loop, and described second control unit is controlled stand by pump and played/stop control loop according to the output result of first delay unit.
2. according to the described self oiling pressure control device of claim 1, it is characterized in that described first delay unit comprises time delay relay and auxiliary contact thereof, described second control unit comprises auxiliary reclay and auxiliary contact thereof.
3. according to the described self oiling pressure control device of claim 2, after the control coil that it is characterized in that described time delay relay is connected in series the first pressure detecting signal contact, with the two ends corresponding connection respectively of control power supply; First contact of described time delay relay, serial connection is arranged in second control unit.
4. according to the described self oiling pressure control device of claim 2, after the control coil that it is characterized in that described auxiliary reclay is connected in series first contact of described time delay relay, with the two ends corresponding connection respectively of control power supply; Described auxiliary reclay often drive auxiliary contact, serial connection is arranged in the stand by pump start-up control loop.
5. according to the described self oiling pressure control device of claim 3, it is characterized in that the described first pressure detecting signal contact is to be arranged on the main pipe pressure output signal on the low side that first pressure switch on the system pipeline is exported.
6. according to the described self oiling pressure control device of claim 3, it is characterized in that described first contact is for often driving the time-delay break contact.
7. according to claim 2,3 or 4 described self oiling pressure control devices, it is characterized in that
The end of described time delay relay control coil SJ, is connected with the N end of control power supply with the corresponding connection of 101 ends of control power supply, the other end of time delay relay control coil SJ through the first pressure detecting signal contact SP1;
The end of described auxiliary reclay control coil ZJ, is connected with the N end of control power supply with the corresponding connection of 101 ends of control power supply, the other end of auxiliary reclay control coil ZJ through the first contact SJ-1 of described time delay relay;
Described auxiliary reclay is often opened the end of auxiliary contact ZJ-1, be connected with the 18th end of selective switchgear SA1, the other end of auxiliary contact ZJ-1 often left by auxiliary reclay, through Oil pump electrical machinery major loop contactor interlock circuit and Oil pump electrical machinery major loop contactor coil KM, be connected with the N end of control power supply.
8. according to the described self oiling pressure control device of claim 1, it is characterized in that described main pipe pressure changes level and smooth module and comprises the 3rd alarm unit, described alarm unit is arranged on main pipe pressure and crosses in the low condition detection loop.
9. according to the described self oiling pressure control device of claim 8, it is characterized in that described the 3rd alarm unit comprises sound, light warning device.
10. according to the described self oiling pressure control device of claim 9, it is characterized in that described the 3rd alarm unit comprises buzzer FM and the 3rd signaling lamp HL3, the one end is crossed low-output signal contact SP2 through being arranged on the main pipe pressure that second pressure switch on the system pipeline exports after described buzzer and the 3rd signaling lamp parallel connection, the corresponding connection of 101 ends with the control power supply, the other end after buzzer and the signaling lamp parallel connection is connected with the N end of control power supply.
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CN2011201195136U CN202048339U (en) | 2011-04-21 | 2011-04-21 | Automatic lubricating pressure control device |
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CN2011201195136U CN202048339U (en) | 2011-04-21 | 2011-04-21 | Automatic lubricating pressure control device |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102684150A (en) * | 2012-05-31 | 2012-09-19 | 襄垣县树元电器有限公司 | Pressure pre-warning and delay protection device |
CN105370610A (en) * | 2015-11-30 | 2016-03-02 | 中冶南方工程技术有限公司 | Gas pressuring machine monitoring and protection system |
CN105589481A (en) * | 2015-03-31 | 2016-05-18 | 河南华润电力古城有限公司 | Intelligent sliding pressure control method and system |
CN108548081A (en) * | 2018-06-29 | 2018-09-18 | 徐州徐工筑路机械有限公司 | A kind of centralized lubrication automatic control system and its lubricating method |
CN108757535A (en) * | 2018-05-30 | 2018-11-06 | 天津平高智能电气有限公司 | Fan operation monitoring method, system and blower fan system |
CN109237287A (en) * | 2018-11-09 | 2019-01-18 | 四川川润液压润滑设备有限公司 | A kind of method that lubricating oil system failure of pump determines and standby usage pump automatically switches |
CN109296918A (en) * | 2018-11-08 | 2019-02-01 | 四川川润液压润滑设备有限公司 | A kind of bi-motor determines number control method for automatically switching |
CN109340549A (en) * | 2018-08-24 | 2019-02-15 | 四川川润液压润滑设备有限公司 | A kind of control method that lubricating system oil pump fault judges automatically and switches |
CN115507283A (en) * | 2022-09-29 | 2022-12-23 | 上海华电电力发展有限公司望亭发电分公司 | Fault self-diagnosis method for test control loop of lubricating oil system |
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2011
- 2011-04-21 CN CN2011201195136U patent/CN202048339U/en not_active Expired - Fee Related
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102684150A (en) * | 2012-05-31 | 2012-09-19 | 襄垣县树元电器有限公司 | Pressure pre-warning and delay protection device |
CN105589481A (en) * | 2015-03-31 | 2016-05-18 | 河南华润电力古城有限公司 | Intelligent sliding pressure control method and system |
CN105370610A (en) * | 2015-11-30 | 2016-03-02 | 中冶南方工程技术有限公司 | Gas pressuring machine monitoring and protection system |
CN108757535A (en) * | 2018-05-30 | 2018-11-06 | 天津平高智能电气有限公司 | Fan operation monitoring method, system and blower fan system |
CN108548081A (en) * | 2018-06-29 | 2018-09-18 | 徐州徐工筑路机械有限公司 | A kind of centralized lubrication automatic control system and its lubricating method |
CN109340549A (en) * | 2018-08-24 | 2019-02-15 | 四川川润液压润滑设备有限公司 | A kind of control method that lubricating system oil pump fault judges automatically and switches |
CN109296918A (en) * | 2018-11-08 | 2019-02-01 | 四川川润液压润滑设备有限公司 | A kind of bi-motor determines number control method for automatically switching |
CN109237287A (en) * | 2018-11-09 | 2019-01-18 | 四川川润液压润滑设备有限公司 | A kind of method that lubricating oil system failure of pump determines and standby usage pump automatically switches |
CN115507283A (en) * | 2022-09-29 | 2022-12-23 | 上海华电电力发展有限公司望亭发电分公司 | Fault self-diagnosis method for test control loop of lubricating oil system |
CN115507283B (en) * | 2022-09-29 | 2024-04-30 | 上海华电电力发展有限公司望亭发电分公司 | Lubricating oil system test control loop fault self-diagnosis method |
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Granted publication date: 20111123 Termination date: 20160421 |