CN105021400A - Intermediate bearing with hydraulic loading device used for ship cardan shaft system test stand - Google Patents
Intermediate bearing with hydraulic loading device used for ship cardan shaft system test stand Download PDFInfo
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Abstract
The invention relates to an intermediate bearing with a hydraulic loading device used for a ship cardan shaft system test stand. The intermediate bearing is mainly composed of a hydraulic loading system, a pressure sensor detection unit, a displacement sensor detection unit, a hydraulic loading control system and a hydraulic console system. The hydraulic loading system and the rack of the intermediate bearing are designed in an integrated manner, thus the shafting of the intermediate bearing is supported while displacement of the intermediate bearing in the horizontal and vertical directions is controlled to simulate bearing position offset caused by ship body deformation. Influences of bearing position change on shafting vibration characteristics can be reflected well, a vertical or transverse position of a bearing can be changed through the hydraulic loading system, furthermore dynamic simulation of ship body deformation is carried out, and influences on the shafting vibration characteristics are analyzed.
Description
Technical field
The present invention relates to marine propulsion shafting Dynamical Characteristics and large ship performance boost, particularly relate to the intermediate bearing with hydraulic means of Ship Propeling testing table.
Background technology
Maximize, specialized, intelligent, safety, energy-conservation be World Ship technology trends with environmental protection.China's Ship Design building technology development is swift and violent, large ship such as ten thousand casees above container ships, ultra large crude carrier, aircraft carriers etc., has become China's Development of Marine transport, has safeguarded the important equipment of maritime rights and interests and enforcement ocean development strategy.Marine shafting is the important component part of propulsion system, and its reliability and stability are important leverages of marine operation safety.Along with larger-sized vessel, main frame single-machine capacity strengthens, the deformation of hull increases, axle journal and the length overstriking thereupon (nearly one meter of diameter) of axle system, lengthen (tens even over one hundred rice), the uncertain factor of axle system running increases, and proposes requirements at the higher level to its reliability, security, environmental suitability etc.For adapting to the demand of larger-sized vessel, be badly in need of the problem solving marine shafting Optimization Theory and method.
Therefore, need the dynamics problem of research large ship propulsion system under marine environment, particularly consider the problems such as the coupling influence of the deformation of hull and Propulsion Systems.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of intermediate bearing with hydraulic loading device system test-bed for ship propulsive shafting, to simulate the effect of the deformation of hull at intermediate bearing place to Propulsion Systems in actual environment, solve the deficiency of spot ship Propulsion Systems testing table.
The present invention solves its technical matters and adopts following technical scheme:
The intermediate bearing with hydraulic loading device system test-bed for ship propulsive shafting provided by the invention, it forms primarily of hydraulic loading system, pressure transducer detecting unit, displacement transducer detecting unit, hydraulic loaded control system and hydraulic control panel system, wherein: the frame of hydraulic loading system and intermediate bearing adopts integration design, with this while the axle system supporting intermediate bearing, control the displacement of intermediate bearing level, vertical direction, for simulating the position of bearings skew that the deformation of hull causes.
Described hydraulic loading system, it is made up of the transverse hydraulic charger of identical each of structure by a hydraulic circuit and longitudinal hydraulic loading device, they are arranged in horizontal, longitudinal both direction of the frame of described intermediate bearing respectively, and hydraulic loading device is connected with rack-mounted suspended axle bearing sleeve respectively.
Described transverse hydraulic charger, longitudinal hydraulic loading device, be equipped with servo hydraulic cylinder, electrohydraulic servo valve, servo hydraulic cylinder shell, fine filter, retaining valve, electromagnetic relief valve, hydraulic pump and Electric Machine at Pumping Station, wherein: servo hydraulic cylinder wrap by servo hydraulic cylinder shell, this servo hydraulic cylinder shell is screwed with frame and is connected.
Described transverse hydraulic charger, longitudinal hydraulic loading device, their hydraulic circuit acts on respectively or regulates simultaneously.
Described pressure transducer detecting unit is primarily of the industrial computer be connected with data line, four pressure transducer compositions, wherein: transverse hydraulic charger and longitudinal hydraulic loading device are respectively provided with two pressure measuring tie-ins, and the screw thread on pressure measuring tie-in is used for fixing pressure sensor position; In the front oil pocket that described pressure measuring tie-in is arranged on servo hydraulic cylinder respectively and rear oil pocket, the pressure change of front oil pocket and rear oil pocket is monitored.
Institute's displacement sensors detecting unit primarily of the industrial computer be connected with data line, two displacement transducers composition, wherein: 1 displacement transducer be fixed on by screw thread in the frame of intermediate bearing is respectively housed in transverse hydraulic charger and longitudinal hydraulic loading device.
Described hydraulic control panel system, primarily of the industrial computer, Electric Machine at Pumping Station power supply and the control loop that are connected with data line, pci signal acquisition system, hydraulic proportion valve control loop, water circulating pump power supply and control loop composition.
At straight pin and suspended axle bearing sleeve junction, circlip for shaft is installed, correct in order to guarantee the loading direction of the servo hydraulic cylinder in hydraulic loading system, and carry out certain buffering, prevent loading too quickly, damage shaft components.
The present invention compared with prior art has following main advantage:
1. existing most shafting test bed structure division is completely fixed, and bearing cannot move, even if small part axle is system test-bed add the methods such as pad by under bearing seat, realizes the vertical deviation of bearing to a certain extent.But these all experiment tablees all fundamentally cannot realize the displacement of bearing, and the present invention is by adding hydraulic loading system at the support section of intermediate bearing, position of bearings is subjected to displacement, solves the system test-bed effect can not simulating deformation of hull shaft of existing ship propulsive shafting.
2. the control survey system by being connected with hydraulic loading system, utilize the feedback data of pressure transducer and displacement transducer, by controlling the aperture of servo-valve in host computer, determine size and the rule of change in displacement, in order to simulate the position of bearings dynamic displacement that the deformation of hull in vessel motion process causes.Simultaneously, the design of multi-direction hydraulic loading device can realize the multi-direction simultaneous displacement loading of Ship Propeling bearing, simulate real navigation axle system more really and affect situation by the deformation of hull, reflection Propulsion Systems running status, improves the experimental test ability that ship propulsive shafting is system test-bed.
By the impact experiment of research simulation deformation of hull shaft vibration characteristics, vertical/transversal displacement is applied under certain rotating speed, rolling bearing actual displacement size is obtained according to displacement transducer, measured by vibration transducer shaft vibration situation of change, that checks that this device can be correct from the angle analysis of vibration characteristics change carries out simulation test to deformation of hull situation, and its result is see Fig. 5-Figure 13.Analytical test result, the oscilating characteristic before and after contrast loads, can find out that this device can be good at reflecting the impact of position of bearings change shaft vibration characteristics.Find out thus, this device can change the vertical and lateral attitude of bearing by hydraulic loading system, and then the dynamic similation deformation of hull, analyzes the impact of its shaft vibration characteristics.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention, and comprise horizontal, longitudinal hydraulic loading device, both structures are identical.
Fig. 2 is hydraulic loading device schematic diagram.
Fig. 3 is hydraulic control panel closed-loop control block figure.
Fig. 4 is hydraulic control panel system diagram.
Fig. 5-Fig. 7 is respectively under no-load condition, the dynamic respond spectrogram of UX, UY of 3 different measuring points when axle ties up to 100r/min tri-rotating speeds, as a comparison curve with load after curve contrast.
Fig. 8-Figure 10 is the response spectrum figure that axle ties up to 3 measuring points when being applied with the excitation of vertical hull dynamic displacement respectively.Compared with spectrogram during zero load, after bearing is applied with displacement dynamic exciting, measuring point place obtains dynamic respond and has all occurred larger amplification, and the dynamic displacement that namely hull is vertical can cause the whirling vibration of marine propulsion shafting.
Figure 11-Figure 13 is the response spectrum figure that axle ties up to 3 measuring points when being applied with the excitation of horizontal hull dynamic displacement respectively.Compared with spectrogram during zero load, after bearing is applied with displacement dynamic exciting, measuring point place obtains dynamic respond and has all occurred larger amplification, and the dynamic displacement that namely hull is vertical can cause the whirling vibration of marine propulsion shafting, but less than the impact of vertical excitation.
In figure: 1. transverse hydraulic charger; 2. longitudinal hydraulic loading device; 3. displacement transducer; 4. pressure transducer; 5. servo hydraulic cylinder; 6. electrohydraulic servo valve; 7. servo hydraulic cylinder shell; 8. pressure measuring tie-in; 9. socket head cap screw fixed by oil cylinder; 10. straight pin; 11. circlips for shaft; 12. suspended axle bearing sleeves; 13. cylinder roller bearings; 14. adjustment socket head cap screws; 15. horizontal adjustment socket head cap screws; 16. outer-hexagonal bolts; 17. frame pressing plates; 18. frames; 19. fine filters; 20. retaining valves; 21. electromagnetic relief valves; 22. hydraulic pumps; 23. Electric Machine at Pumping Station.
Embodiment
A kind of intermediate bearing with hydraulic loading device system test-bed for ship propulsive shafting provided by the invention.This intermediate bearing with charger load the compositions such as hydraulic means, force snesor detecting unit, displacement transducer detecting unit and hydraulic loading system controller primarily of power.Power loads hydraulic means and has two hydraulic circuits, and be arranged on respectively on marine propulsion shafting in intermediate bearing place transverse direction, longitudinal both direction, utilize oil cylinder to load, two hydraulic circuits both can act on respectively and also can regulate simultaneously.By the size of pressure transducer detected pressures, displacement transducer detection axis displacement, thus realize closed-loop control, carry out conventional periodic function displacement to bearing to load, to simulate the effect of the deformation of hull at intermediate bearing place to Propulsion Systems in actual environment, solve the coupling influence between the deformation of hull and Propulsion Systems, effectively research Propulsion Systems dynamics.
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but do not limit the present invention.
A kind of intermediate bearing with hydraulic loading device system test-bed for ship propulsive shafting provided by the invention, it adopts cylinder roller bearing to hang with hydraulic loading device the structure be connected, by the unbalanced oil pressure of inside and outside hydraulic jack, change cylinder piston position, and then change the position hanging with it the cylinder roller bearing of connection.The structure of this intermediate bearing as shown in Figures 1 to 4, forms primarily of hydraulic loading system, pressure transducer detecting unit, displacement transducer detecting unit, hydraulic loaded control system and hydraulic control panel system; Wherein, hydraulic loading device and intermediate bearing adopt integration design, change the irremovable characteristic of traditional bearing with this, while the axle system supporting intermediate bearing, the displacement of bearing level, vertical direction can be controlled, for simulating the position of bearings skew that the deformation of hull causes.
Described hydraulic loading system has two hydraulic circuits, be arranged on marine propulsion shafting experiment table intermediate bearing place respectively laterally, in longitudinal both direction, therefore transverse hydraulic charger 1 can be called respectively, longitudinal hydraulic loading device 2 (Fig. 1), their structure is identical, comprise servo hydraulic cylinder 5, electrohydraulic servo valve 6, servo hydraulic cylinder shell 7, fine filter 19, retaining valve 20, electromagnetic relief valve 21, hydraulic pump 22, Electric Machine at Pumping Station 23, wherein: servo hydraulic cylinder 5 wrap by servo hydraulic cylinder shell 7, and utilize oil cylinder to fix socket head cap screw 9 servo hydraulic cylinder shell 7 is connected with frame 18, fix the position of servo hydraulic cylinder 5 whereby.Its hydraulic loaded mode is: drive hydraulic pump 22 to provide original oil pressure for main oil pipe road by Electric Machine at Pumping Station 23, and utilize retaining valve 20 and electromagnetic relief valve 21 to carry out corresponding control, guarantees that oil pressure is stablized; Fine filter 19 is utilized to remove impurity in fluid.During loading, change cavity pressure before and after servo hydraulic cylinder 5 by electrohydraulic servo valve 6, control oil cylinder piston and advance or retreat, drive the suspended axle bearing sleeve 12 and cylinder roller bearing 13 displacement that are connected with straight pin 10, the position of bearings change that the simulation deformation of hull causes, cylinder roller bearing 13 wrap by the suspended axle bearing sleeve 12 in frame, and suspended axle bearing sleeve 12 is connected with hydraulic loading system by straight pin 10 (pin connects), hang on piston pin junction in servo hydraulic cylinder 5, when guaranteeing the change when servo hydraulic cylinder 5 loads, cylinder roller bearing 13 can be driven by suspended axle bearing sleeve 12, its position is changed, wherein sell junction to be cushioned by circlip for shaft 11, this kind of syndeton is while playing bearings effect, conveniently dynamically change position of bearings when axle system runs, the impact of simulation deformation of hull shaft.In addition, in straight pin 10 and suspended axle bearing sleeve 12 junction, circlip for shaft 11 is installed, correct in order to guarantee the loading direction of the servo hydraulic cylinder 5 in hydraulic loading system, and carry out certain buffering, prevent loading too quickly, damage shaft components.
Described two hydraulic circuits, one of them hydraulic circuit is: the pressure oil that hydraulic pump 22 exports is after fine filter 19 filters, again by retaining valve 20 to electromagnetic relief valve 21 also off-load, press Electric Machine at Pumping Station 23 start button on control desk, this switching signal exports PLC to, and after 3s, the electromagnet DT that PLC controls on electromagnetic relief valve 21 obtains electric, thus realizing the No Load Start of Electric Machine at Pumping Station 23, Electric Machine at Pumping Station 23 starts rear hydraulic pump 22 output pressure and rises to industrial computer set pressure; The pressure oil that hydraulic pump 22 exports is to electrohydraulic servo valve 6 integrated package.Another hydraulic circuit is: when inputting forward current to electrohydraulic servo valve 6, pressure oil enters the rodless cavity of servo hydraulic cylinder 5 by electrohydraulic servo valve 6, piston rod in servo hydraulic cylinder 5 is protruding, the mechanical driving device impeller-hub system fastened by axle, axle system offset displacement is adapted with input signal, realizes the object of shaft loading force.When inputting inverse current to electrohydraulic servo valve 6, shaft can load power in the other direction, its control mode is same as described above.Two hydraulic circuits stretch out withdrawal by servo hydraulic cylinder 5 piston rod, and load the contrary thrust in a pair direction or pulling force, the simulation deformation of hull is at the deformation displacement of horizontal, longitudinal both direction at intermediate bearing place.
Described transverse hydraulic charger 1, longitudinal hydraulic loading device 2, it utilizes oil cylinder to longitudinally, laterally loading, and two hydraulic circuits both can act on respectively and also can regulate simultaneously.By the size of pressure transducer 4 detected pressures, displacement transducer 3 detection axis displacement, thus realize closed-loop control, carry out conventional periodic function displacement to bearing to load, to simulate the effect of the deformation of hull at intermediate bearing place to Propulsion Systems in actual environment, solve the coupling influence between the deformation of hull and Propulsion Systems, effectively research Propulsion Systems dynamics.
In this system, fixed sturcture parts comprise: socket head cap screw 9 fixed by oil cylinder, adjustment socket head cap screw 14, horizontal adjustment socket head cap screw 15, outer-hexagonal bolts 16, frame pressing plate 17, frame 18.Wherein, oil cylinder fixes socket head cap screw 9 for standard component M16*25, for servo hydraulic cylinder shell 7 is connected with frame 18, and the position of fixing servo hydraulic cylinder 5; Adjustment socket head cap screw 14 and horizontal adjustment socket head cap screw 15 are standard component M16*35, for frame pressing plate 17 and floor base being fixed; Outer-hexagonal bolts 16 is standard component M20*85, for the position of fixed frame pressing plate 17 and frame 18.Frame pressing plate 17 is mainly used in connecting floor base and bearing spider 18.
Described pressure transducer detecting unit is by industrial computer, 4 pressure transducers 4,4 pressure measuring tie-ins 8 and supporting signal transmission thereof and acquisition module composition, wherein: in transverse hydraulic charger 1 and longitudinal hydraulic loading device 2,2 pressure transducers 4 are respectively housed, be threaded by pressure measuring tie-in 8, be arranged on the front oil pocket of servo hydraulic cylinder 5 and rear oil pocket respectively, in order to measure the pressure change of front and back oil pocket, again by pressure differential and the lifting surface area of front and back oil pocket, calculated the pressure size and Orientation of loading by Survey Software.
Institute's displacement sensors detecting unit is by industrial computer, 2 displacement transducers 1 and supporting signal transmission thereof and acquisition module composition, wherein: 1 displacement transducer 3 be fixed on by screw thread in frame is respectively housed in transverse hydraulic charger 1 and longitudinal hydraulic loading device 2, this displacement transducer Main Basis magnetic coil principle is measured, and mainly comprises coil, push rod and measurement mechanism in sensor internal structure.Push rod is longer, immediate roof is on the piston of servo hydraulic cylinder 5, but when piston causes position to change because front and back pressure is uneven, push rod relative coil movement is driven to produce magnetic induction change, magnetic induction changes the curent change caused and exports as corresponding signal, transfers to data acquisition card and then is passed to industrial computer.
Institute's displacement sensors 3 and pressure transducer 4 are arranged on hydraulic loading device, be connected with the signal processing unit in the controller of hydraulic loading device by field terminal box, the control output unit in the controller of hydraulic loading device loads pumping plant unit by electric liquid conversion and control mode with power and is connected.Pressure transducer detects the size of the pressure of hydraulic pump 22, displacement transducer detection axis displacement, displacement and pressure signal are fed back to the controller of hydraulic loading device, hydraulic control charger changes applied pressure, realize the displacement signal become when the conventional periodic function displacement of shaft input loads, as sine, cosine, square wave etc.Hydraulic control panel closed-loop control block figure as shown in Figure 3.
Described hydraulic control panel system, form primarily of host computer (industrial computer), Electric Machine at Pumping Station power supply and control loop, electric power loop, pci signal acquisition system, hydraulic proportion valve control loop, water circulating pump power supply and control loop, as shown in Figure 4, wherein: PCI acquisition system and host computer are the cores of hydraulic control panel, collect numeral and simulating signal by PCI capture card, and in industrial computer, signal is processed.Motor input voltage AC380V, when oil tank liquid level is low or oil circuit blocking, motor stops, and control desk sends sound and light alarm signal, reminds testing crew to stop loading.In control desk, the supply voltage such as PLC system, solenoid valve is DC24V, should have Switching Power Supply AC220V being converted to DC24V.Control desk should install AC220V socket, conveniently debug use.PLC system is made up of power module, digital quantity input/output module, analog input/output module, storage card.The signal of digital quantity input module input comprises that Electric Machine at Pumping Station opens/stops, Electric Machine at Pumping Station runs feedback, oil circuit blocking, oil tank liquid level height; Digital output module export signal comprises pumping station system sound and light alarm, motor opens/stops, surplus valve control; The signal of Analog input mModule input comprises No. 4 pressure transducers, 2 road displacement transducer signals.The signal that analog output module exports comprises the control of 2 road hydraulic proportion valves.Pumping station system heat radiation adopts water-cooling pattern, and the control signal that opens/stop of water circulating pump does not enter PLC.Host computer mainly carries out the loading of power, the display of power.On control desk except industrial computer, also should there is the instruction of pumping plant power supply, Electric Machine at Pumping Station runs instruction, pumping station system fault sound and light alarm indicates, Electric Machine at Pumping Station opens/stop control knob, water circulating pump opens/stop control knob, AC220V debugs socket; The equipment such as PLC system, Switching Power Supply, relay, isolating switch, insurance is had in control desk.
The above-mentioned intermediate bearing with hydraulic loading device system test-bed for ship propulsive shafting (abbreviation bearing) provided by the invention, its course of work is as follows:
Check in bearing loading place cylinder roller bearing, whether railway grease (butter) is smeared and put in place, if do not smear, is then annotate with pressure gun; Check that each sliding bearing place lubricates in-oil cylinder lubricating oil and whether annotates and put in place; Check whether power supply electric brake is opened errorless; Check pumping plant original pressure level, be generally 3MPa-5MPa;
Open the measuring system in control desk industrial computer, after working procedure, each pressure transducer, displacement transducer are started working, and show corresponding readings;
Manual unlocking motor before frequency conversion tank, by frequency conversion tank control panel regulating shaft system rotating speed (the corresponding 73 turns/min of 5Hz), for ensureing experiment table stable operation, its rotational speed is no more than 300-400 as far as possible and turns/min;
Control desk starts pumping plant, makes the No Load Start of Electric Machine at Pumping Station, primer fluid pressure electromagnetic valve in process of measurement;
After all systems all start, guaranteeing that each sensor initial setting up is errorless, under the prerequisite that main pipeline pressure is suitable, the loading carrying out all directions in software in control desk industrial computer is arranged, select the waveform (sine loaded, square wave, Triangular light), and required loading frequency and side-play amount are set, (frequency is generally no more than 5Hz), after being provided with, load accordingly, when industrial computer control electro-hydraulic servo amplifier inputs forward/negative current to servo-valve, servo valve control pressure oil enters rodless cavity (front the oil cylinder)/rod chamber (rear oil cylinder) of servoBcylinder, cause front and back oil cylinder working-pressure not, make the piston rod in rear oil cylinder protruding, and by corresponding mechanical driving device, pressure is applied to axle and fastens, axle is tied up to this side up occur before and after skew, and export displacement size to electro-hydraulic servo amplifier with the form of voltage signal by displacement transducer, and electro-hydraulic servo amplifier is contrasted the actual displacement that obtains arranging displacement and displacement transducer by inner PID control circuit, and whereby output current signal is modified, realize the object controlling the load deflection of axle system, the transverse direction of the simulation deformation of hull at intermediate bearing place, the deformation displacement of longitudinal both direction.
Claims (8)
1. one kind for the system test-bed intermediate bearing with hydraulic loading device of ship propulsive shafting, it is characterized in that this intermediate bearing forms primarily of hydraulic loading system, pressure transducer detecting unit, displacement transducer detecting unit, hydraulic loaded control system and hydraulic control panel system, wherein: the frame (18) of hydraulic loading system and intermediate bearing adopts integration design, with this while the axle system supporting intermediate bearing, control the displacement of intermediate bearing level, vertical direction, for simulating the position of bearings skew that the deformation of hull causes.
2. intermediate bearing according to claim 1, it is characterized in that described hydraulic loading system is made up of respectively have the transverse hydraulic charger (1) of a hydraulic circuit and the longitudinal hydraulic loading device (2) that structure is identical, they are arranged in horizontal, longitudinal both direction of the frame (18) of described intermediate bearing respectively, and hydraulic loading device is connected with the suspended axle bearing sleeve (12) be arranged in frame (18) respectively.
3. intermediate bearing according to claim 2, it is characterized in that described transverse hydraulic charger (1), longitudinal hydraulic loading device (2), be equipped with servo hydraulic cylinder (5), electrohydraulic servo valve (6), servo hydraulic cylinder shell (7), fine filter (19), retaining valve (20), electromagnetic relief valve (21), hydraulic pump (22) and Electric Machine at Pumping Station (23), wherein: servo hydraulic cylinder (5) wrap by servo hydraulic cylinder shell (7), this servo hydraulic cylinder shell (7) is screwed with frame (18) and is connected.
4. intermediate bearing according to claim 2, it is characterized in that described transverse hydraulic charger (1), longitudinal hydraulic loading device (2), their hydraulic circuit acts on respectively or regulates simultaneously.
5. intermediate bearing according to claim 2, it is characterized in that, in suspended axle bearing sleeve (12) and straight pin (10) junction, circlip for shaft (11) is installed, correct in order to guarantee the loading direction of the servo hydraulic cylinder (5) in hydraulic loading system, and carry out certain buffering, prevent loading too quickly, damage shaft components.
6. intermediate bearing according to claim 1, it is characterized in that described pressure transducer detecting unit is primarily of the industrial computer be connected with data line, four pressure transducer (4) compositions, wherein: transverse hydraulic charger (1) and longitudinal hydraulic loading device (2) are respectively provided with two pressure measuring tie-ins (8), and the screw thread on pressure measuring tie-in (8) is used for fixing pressure transducer (4) position; In the front oil pocket that described pressure measuring tie-in (8) is arranged on servo hydraulic cylinder (5) respectively and rear oil pocket, oil pocket pressure change in front and back is monitored.
7. intermediate bearing according to claim 1, it is characterized in that institute's displacement sensors detecting unit is primarily of the industrial computer be connected with data line, two displacement transducers (3) composition, wherein: 1 displacement transducer (3) be fixed on by screw thread in the frame (18) of intermediate bearing is respectively housed in transverse hydraulic charger (1) and longitudinal hydraulic loading device (2).
8. intermediate bearing according to claim 1, it is characterized in that described hydraulic control panel system, primarily of the industrial computer, Electric Machine at Pumping Station power supply and the control loop that are connected with data line, pci signal acquisition system, hydraulic proportion valve control loop, water circulating pump power supply and control loop composition.
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| CN105021400B (en) | 2018-03-16 |
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