CN105422522A - Pump control hydraulic drive device and method - Google Patents
Pump control hydraulic drive device and method Download PDFInfo
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- CN105422522A CN105422522A CN201610048549.7A CN201610048549A CN105422522A CN 105422522 A CN105422522 A CN 105422522A CN 201610048549 A CN201610048549 A CN 201610048549A CN 105422522 A CN105422522 A CN 105422522A
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- hydraulic motor
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- pump
- rotating speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/04—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by varying the output of a pump with variable capacity
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a pump control hydraulic drive device, comprising a centrifugal water pump, a coupler, a rotating speed sensor, a hydraulic motor, a hydraulic valve bank, an electronically controlled variable pump and a hydraulic oil tank, wherein the centrifugal water pump is connected to the hydraulic motor by the coupler, the rotating speed sensor is arranged on the hydraulic motor, and an oil path of the hydraulic oil tank is sequentially connected with the electronically controlled variable pump, the hydraulic valve bank and the hydraulic motor and forms a circuit; wherein the hydraulic valve bank is used for performing oil path protection and monitoring, and controlling the starting and shutting of the hydraulic motor, and the electronically controlled variable pump is used for outputting different pressures after the hydraulic motor is started by the hydraulic valve bank, so that the hydraulic motor reaches different rotating speeds, and then the centrifugal water pump is enabled to output different flow rates and lifts. The invention also discloses a pump control hydraulic drive method. The pump control hydraulic drive device and method can realize multi-level speed regulation control on the rotating speed of the hydraulic motor without the influence of the rotating speed of an engine .
Description
Technical field
The present invention relates to engineering machinery hydraulic control technique field, particularly relate to a kind of pump control hydraulic drive unit and method.
Background technique
Highway Mine-Used Watering refers in the open on the accommodation road such as mine or large-scale civil engineering building site, carry out depositing dust, fire-fighting, burst a kind of special-purpose vehicle of heap and the operation such as delivery industry water, have that height spills, lowly to spill, gravity spills, spray in high-altitude, fire-fighting, the mode of operation such as self-loopa and delivery industry water.Therefore for different working modes, the centrifugal water pump providing pressure water source is needed to export different flow and lifts, and centrifugal water pump is by fluid motor-driven, so require to carry out stepping speed regulating control to the rotating speed of oil hydraulic motor, simultaneously as far as possible not by the impact of engine speed.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of pump control hydraulic drive unit and method, realizes carrying out stepping speed regulating control to the rotating speed of oil hydraulic motor, simultaneously not by the impact of engine speed.
In order to solve the problems of the technologies described above, provide a kind of pump control hydraulic drive unit on the one hand, comprise centrifugal water pump, coupling, speed probe, oil hydraulic motor, hydraulic valve bank, automatically controlled variable displacement pump and hydraulic oil container, described centrifugal water pump is connected to described oil hydraulic motor by described coupling, described speed probe is arranged on described oil hydraulic motor, being connected with described automatically controlled variable displacement pump, described hydraulic valve bank, described oil hydraulic motor and forming loop successively of the oil circuit of described hydraulic oil container;
Wherein, described hydraulic valve bank is for carrying out protection and the monitoring of oil circuit; and control startup and the closedown of described oil hydraulic motor; described automatically controlled variable displacement pump is used for exporting different pressure after the primer fluid pressure motor of described hydraulic valve bank; thus make the rotating speed that described oil hydraulic motor reaches different, and then described centrifugal water pump is made to export different flow and lifts.
Further, described drive unit also comprises high pressure filter, and described high pressure filter one end is connected to described automatically controlled variable displacement pump by oil circuit, and the other end is connected to described hydraulic valve bank by oil circuit.
Further, described drive unit also comprises the first pressure measuring tie-in, and described first pressure measuring tie-in is connected to described oil hydraulic motor by control wiring, for monitoring the drainage pressure of described oil hydraulic motor.
Further, described hydraulic valve bank specifically comprises: electromagnetic switch valve, safety valve and one-way valve, wherein,
Described electromagnetic switch valve one end connects described oil hydraulic motor by oil circuit, and the other end is connected to described high pressure filter by oil circuit;
One end of described safety valve is connected to the oil circuit between described electromagnetic switch valve and described high pressure filter, and the other end is connected to the oil circuit between described oil hydraulic motor and described hydraulic oil container;
The entrance point of described one-way valve is connected to the oil circuit between described electromagnetic switch valve and described oil hydraulic motor, and outlet end is connected to the oil circuit between described oil hydraulic motor and described hydraulic oil container.
On the other hand, provide a kind of pump control hydraulic method for driving, described method is that then described method comprises based on above-mentioned pump control hydraulic drive unit:
Require that m the rotating speed of target setting oil hydraulic motor is n according to the flow and lift of a required m mode of operation
1, n
2..., n
m;
By regulating the input pwm signal of automatically controlled variable displacement pump, automatically controlled variable displacement pump is made to export different pressure, and then make oil hydraulic motor reach m rotating speed of target, and determine to correspond to the input pwm signal I of m rotating speed of target by the real-time rotate speed that contrast speed probe monitors
1, I
2..., I
m;
During opened loop control, after opening electromagnetic switch valve, after user selects mode of operation, the input pwm signal that automatically controlled variable displacement pump input current operation mode is corresponding, delivery pressure rises to target set pressure, and oil hydraulic motor reaches the rotating speed of target needed for this mode of operation;
During closed loop control, hydraulic motor rotary speed is detected by speed probe, close loop control circuit is formed with control wiring, rotating speed of target under adopting the PID control strategy in band dead band to realize each mode of operation, oil hydraulic motor actual speed is allowed to depart from rotating speed of target 25rpm, after exceeding this speed error scope, regulate automatically controlled variable displacement pump input signal, and then regulator solution pressure motor output speed.
Technique scheme tool has the following advantages or beneficial effect: by the control of the delivery pressure of automatically controlled variable displacement pump, can realize carrying out stepping speed regulating control to the rotating speed of oil hydraulic motor, centrifugal water pump is made to export different flow and lifts, thus mode of operations such as the height realizing highway Mine-Used Watering spills, lowly to spill, gravity spills, spray in high-altitude, fire-fighting, self-loopa and delivery industry water, and not by the impact of engine speed.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of an embodiment of pump control hydraulic drive unit provided by the invention;
Fig. 2 is oil hydraulic motor provided by the invention, centrifugal water pump load module schematic diagram;
Fig. 3 is the structural representation of another embodiment of pump control hydraulic drive unit provided by the invention;
Fig. 4 is the structural representation of the another embodiment of pump control hydraulic drive unit provided by the invention;
Fig. 5 is the structural representation of an embodiment again of pump control hydraulic drive unit provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
Fig. 1 is the structural representation of an embodiment of pump control hydraulic drive unit provided by the invention, the embodiment of the present invention is mainly used in highway Mine-Used Watering, as shown in Figure 1, the embodiment of the present invention comprises centrifugal water pump 1, coupling 2, speed probe 3, oil hydraulic motor 4, hydraulic valve bank 5, automatically controlled variable displacement pump 6 and hydraulic oil container 7.Being connected with automatically controlled variable displacement pump 6, hydraulic valve bank 5, oil hydraulic motor 4 and forming loop successively of the oil circuit of hydraulic oil container 7.Hydraulic valve bank 5 is for carrying out protection and the monitoring of oil circuit, and the startup of hydraulic control motor 4 and closedown.Hydraulic oil container 7 is for storing, cooling and standing hydraulic oil.
See figures.1.and.2, centrifugal water pump 1 is connected to hydraulic pressure horse 4 by coupling 2, and speed probe 3 is arranged on oil hydraulic motor 4.The output torque Direct driver centrifugal water pump 1 of oil hydraulic motor 4, ignores acceleration and mechanical loss, and the resisting moment of centrifugal water pump 1 equals the output torque of oil hydraulic motor 4.According to the performance characteristic of centrifugal water pump 4, its output flow is directly proportional to rotating speed, square being directly proportional of lift and rotating speed, and its lift is directly proportional to resisting moment, then square being directly proportional of resisting moment and its rotating speed of centrifugal water pump 4; According to the performance characteristic of oil hydraulic motor 4, its output torque is directly proportional to input service pressure; Centrifugal water pump 1 is connected by coupling 2 with oil hydraulic motor 4, and both rotating speeds are identical; Comprehensive above 3 known, square being directly proportional of the input service pressure of oil hydraulic motor 4 and its rotating speed, can control its rotating speed by controlling its input service pressure.
Therefore, automatically controlled variable displacement pump 6 exports different pressure after hydraulic valve bank 5 primer fluid pressure motor 4, thus makes the rotating speed that oil hydraulic motor 4 reaches different, and then makes centrifugal water pump 1 export different flow and lifts.
The beneficial effect of the embodiment of the present invention is: by the control of the delivery pressure of automatically controlled variable displacement pump, can realize carrying out stepping speed regulating control to the rotating speed of oil hydraulic motor, centrifugal water pump is made to export different flow and lifts, thus the mode of operations such as the height realizing highway Mine-Used Watering spills, lowly to spill, gravity spills, spray in high-altitude, fire-fighting, self-loopa and delivery industry water, and the embodiment of the present invention is by the impact of engine speed.
Embodiment 2
Fig. 3 is the structural representation of another embodiment of pump control hydraulic drive unit provided by the invention, the embodiment of the present invention is mainly used in highway Mine-Used Watering, as shown in Figure 3, the embodiment of the present invention comprises centrifugal water pump 1, coupling 2, speed probe 3, oil hydraulic motor 4, hydraulic valve bank 5, automatically controlled variable displacement pump 6, hydraulic oil container 7, high pressure filter 8 and the first pressure measuring tie-in 9.
Being connected with automatically controlled variable displacement pump 6, high pressure filter 8, hydraulic valve bank 5, oil hydraulic motor 4 and forming loop successively of the oil circuit of hydraulic oil container 7.Hydraulic valve bank 5 is for carrying out protection and the monitoring of oil circuit, and the startup of hydraulic control motor 4 and closedown.Hydraulic oil container 7 is for storing, cooling and standing hydraulic oil.High pressure filter 8 enters the oil cleanliness of hydraulic system for improving, be beneficial to the operating life of each element of prolongation system.First pressure measuring tie-in 9 is connected to oil hydraulic motor 4 by control wiring, for monitoring the drainage pressure of oil hydraulic motor 4.
With reference to Fig. 3 and Fig. 2, centrifugal water pump 1 is connected to hydraulic pressure horse 4 by coupling 2, and speed probe 3 is arranged on oil hydraulic motor 4.The output torque Direct driver centrifugal water pump 1 of oil hydraulic motor 4, ignores acceleration and mechanical loss, and the resisting moment of centrifugal water pump 1 equals the output torque of oil hydraulic motor 4.According to the performance characteristic of centrifugal water pump 4, its output flow is directly proportional to rotating speed, square being directly proportional of lift and rotating speed, and its lift is directly proportional to resisting moment, then square being directly proportional of resisting moment and its rotating speed of centrifugal water pump 4; According to the performance characteristic of oil hydraulic motor 4, its output torque is directly proportional to input service pressure; Centrifugal water pump 1 is connected by coupling 2 with oil hydraulic motor 4, and both rotating speeds are identical; Comprehensive above 3 known, square being directly proportional of the input service pressure of oil hydraulic motor 4 and its rotating speed, can control its rotating speed by controlling its input service pressure.
Therefore, automatically controlled variable displacement pump 6 exports different pressure after hydraulic valve bank 5 primer fluid pressure motor 4, thus makes the rotating speed that oil hydraulic motor 4 reaches different, and then makes centrifugal water pump 1 export different flow and lifts.
The beneficial effect of the embodiment of the present invention is: by the control of the delivery pressure of automatically controlled variable displacement pump, can realize carrying out stepping speed regulating control to the rotating speed of oil hydraulic motor, centrifugal water pump is made to export different flow and lifts, thus the mode of operations such as the height realizing highway Mine-Used Watering spills, lowly to spill, gravity spills, spray in high-altitude, fire-fighting, self-loopa and delivery industry water, and the embodiment of the present invention is by the impact of engine speed.The embodiment of the present invention also improves the oil cleanliness entering hydraulic system, is beneficial to the operating life of each element of prolongation system.
Embodiment 3
Fig. 4 is the structural representation of the another embodiment of pump control hydraulic drive unit provided by the invention, and the embodiment of the present invention is mainly used in highway Mine-Used Watering.
As shown in Figure 4, the difference of the embodiment of the present invention and embodiment 2 is:
Hydraulic valve bank 5 specifically comprises electromagnetic switch valve 5a, safety valve 5b and one-way valve 5c, and wherein, electromagnetic switch valve 5a one end is by oil circuit connecting fluid pressure motor 4, and the other end is connected to high pressure filter 8 by oil circuit; One end of safety valve 5b is connected to the oil circuit between electromagnetic switch valve 5a and high pressure filter 8, and the other end is connected to the oil circuit between oil hydraulic motor 4 and hydraulic oil container 7; The entrance point of one-way valve 5c is connected to the oil circuit between electromagnetic switch valve 5a and oil hydraulic motor 4, and outlet end is connected to the oil circuit between oil hydraulic motor 4 and hydraulic oil container 7.
Wherein, electromagnetic switch valve 5a is the switch of oil circuit; safety valve 5b is for the protection of system from impacting with high pressure, and one-way valve 5c is used for carrying out repairing for oil hydraulic motor 4 after electromagnetic switch valve 5a closes, and avoids oil hydraulic motor to cause in-line to inhale empty generation air pocket because of the rotation of inertia.
The embodiment of the present invention is identical with other parts of embodiment 2, does not repeat them here.
The beneficial effect of the embodiment of the present invention is: by the control of the delivery pressure of automatically controlled variable displacement pump, can realize carrying out stepping speed regulating control to the rotating speed of oil hydraulic motor, centrifugal water pump is made to export different flow and lifts, thus the mode of operations such as the height realizing highway Mine-Used Watering spills, lowly to spill, gravity spills, spray in high-altitude, fire-fighting, self-loopa and delivery industry water, and the embodiment of the present invention is by the impact of engine speed.The embodiment of the present invention also improves the oil cleanliness entering hydraulic system, is beneficial to the operating life of each element of prolongation system.The embodiment of the present invention is safer.
Embodiment 4
Fig. 5 is the structural representation of an embodiment again of pump control hydraulic drive unit provided by the invention, and the embodiment of the present invention is mainly used in highway Mine-Used Watering, and as shown in Figure 5, the difference of the embodiment of the present invention and embodiment 3 is:
High pressure filter 8 comprises: bypass valve 8a, blocking warner 8b and filter core 8c, specifically connects see Fig. 5; Comprise one-way valve 6a, electric proportional valve 6b, pressure-compensated valve 6c, variable piston 6d, offset piston 6e in automatically controlled variable displacement pump 6, specifically connect see Fig. 5; Hydraulic valve bank 5 also comprises: a pressure transducer 5d and three pressure measuring tie-in 5e, specifically connects see Fig. 5.
The embodiment of the present invention is identical with other parts of embodiment 3, does not repeat them here.
The beneficial effect of the embodiment of the present invention is: by the control of the delivery pressure of automatically controlled variable displacement pump, can realize carrying out stepping speed regulating control to the rotating speed of oil hydraulic motor, centrifugal water pump is made to export different flow and lifts, thus the mode of operations such as the height realizing highway Mine-Used Watering spills, lowly to spill, gravity spills, spray in high-altitude, fire-fighting, self-loopa and delivery industry water, and the embodiment of the present invention is by the impact of engine speed.The embodiment of the present invention also improves the oil cleanliness entering hydraulic system, is beneficial to the operating life of each element of prolongation system.The embodiment of the present invention is safer.
Embodiment 5
The embodiment of the present invention is an embodiment of a kind of pump control hydraulic method for driving provided by the invention, and method is that then the embodiment of the present invention comprises based on the pump control hydraulic drive unit described in embodiment 3 or embodiment 4:
S1, m the rotating speed of target requiring setting oil hydraulic motor according to the flow and lift of a required m mode of operation are n
1, n
2..., n
m.
Such as, if not road mining sprinkling truck has height to spill, lowly to spill, high-altitude spraying, fire-fighting, self-loopa and delivery industry water 6 mode of operations, so m=6,6 rotating speed of target of setting oil hydraulic motor are n
1, n
2..., n
6.
S2, by regulating the input pwm signal of automatically controlled variable displacement pump, automatically controlled variable displacement pump is made to export different pressure, and then make oil hydraulic motor reach m rotating speed of target, and determine to correspond to the input pwm signal I of m rotating speed of target by the real-time rotate speed that contrast speed probe monitors
1, I
2..., I
m.
Such as, by regulating the input pwm signal of automatically controlled variable displacement pump, determine the input pwm signal I corresponding to 6 rotating speed of target
1, I
2..., I
6.
When S3, opened loop control, after opening electromagnetic switch valve, after user selects mode of operation, the input pwm signal that automatically controlled variable displacement pump input current operation mode is corresponding, delivery pressure rises to target set pressure, and oil hydraulic motor reaches the rotating speed of target needed for this mode of operation;
When S4, closed loop control, hydraulic motor rotary speed is detected by speed probe, close loop control circuit is formed with control wiring, rotating speed of target under adopting the PID control strategy in band dead band to realize each mode of operation, oil hydraulic motor actual speed is allowed to depart from rotating speed of target 25rpm, after exceeding this speed error scope, regulate automatically controlled variable displacement pump input signal, and then regulator solution pressure motor output speed.
The beneficial effect of the embodiment of the present invention is: by the control of the delivery pressure of automatically controlled variable displacement pump, can realize carrying out stepping speed regulating control to the rotating speed of oil hydraulic motor, centrifugal water pump is made to export different flow and lifts, thus the mode of operations such as the height realizing highway Mine-Used Watering spills, lowly to spill, gravity spills, spray in high-altitude, fire-fighting, self-loopa and delivery industry water, and the embodiment of the present invention is by the impact of engine speed.The embodiment of the present invention also improves the oil cleanliness entering hydraulic system, is beneficial to the operating life of each element of prolongation system.The embodiment of the present invention is safer.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or device and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or device.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the device comprising this key element and also there is other identical element.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a pump control hydraulic drive unit, it is characterized in that, comprise centrifugal water pump, coupling, speed probe, oil hydraulic motor, hydraulic valve bank, automatically controlled variable displacement pump and hydraulic oil container, described centrifugal water pump is connected to described oil hydraulic motor by described coupling, described speed probe is arranged on described oil hydraulic motor, being connected with described automatically controlled variable displacement pump, described hydraulic valve bank, described oil hydraulic motor and forming loop successively of the oil circuit of described hydraulic oil container;
Wherein, described hydraulic valve bank is for carrying out protection and the monitoring of oil circuit; and control startup and the closedown of described oil hydraulic motor; described automatically controlled variable displacement pump is used for exporting different pressure after the primer fluid pressure motor of described hydraulic valve bank; thus make the rotating speed that described oil hydraulic motor reaches different, and then described centrifugal water pump is made to export different flow and lifts.
2. pump control hydraulic drive unit as claimed in claim 1, it is characterized in that, described drive unit also comprises high pressure filter, and described high pressure filter one end is connected to described automatically controlled variable displacement pump by oil circuit, and the other end is connected to described hydraulic valve bank by oil circuit.
3. pump control hydraulic drive unit as claimed in claim 1 or 2, it is characterized in that, described drive unit also comprises the first pressure measuring tie-in, and described first pressure measuring tie-in is connected to described oil hydraulic motor by control wiring, for monitoring the drainage pressure of described oil hydraulic motor.
4. pump control hydraulic drive unit as claimed in claim 3, it is characterized in that, described hydraulic valve bank specifically comprises: electromagnetic switch valve, safety valve and one-way valve, wherein,
Described electromagnetic switch valve one end connects described oil hydraulic motor by oil circuit, and the other end is connected to described high pressure filter by oil circuit;
One end of described safety valve is connected to the oil circuit between described electromagnetic switch valve and described high pressure filter, and the other end is connected to the oil circuit between described oil hydraulic motor and described hydraulic oil container;
The entrance point of described one-way valve is connected to the oil circuit between described electromagnetic switch valve and described oil hydraulic motor, and outlet end is connected to the oil circuit between described oil hydraulic motor and described hydraulic oil container.
5. a pump control hydraulic method for driving, is characterized in that, described method is that then described method comprises based on pump control hydraulic drive unit according to claim 4:
Require that m the rotating speed of target setting oil hydraulic motor is n according to the flow and lift of a required m mode of operation
1, n
2..., n
m;
By regulating the input pwm signal of automatically controlled variable displacement pump, automatically controlled variable displacement pump is made to export different pressure, and then make oil hydraulic motor reach m rotating speed of target, and determine to correspond to the input pwm signal I of m rotating speed of target by the real-time rotate speed that contrast speed probe monitors
1, I
2..., I
m;
During opened loop control, after opening electromagnetic switch valve, after user selects mode of operation, the input pwm signal that automatically controlled variable displacement pump input current operation mode is corresponding, delivery pressure rises to target set pressure, and oil hydraulic motor reaches the rotating speed of target needed for this mode of operation;
During closed loop control, hydraulic motor rotary speed is detected by speed probe, close loop control circuit is formed with control wiring, rotating speed of target under adopting the PID control strategy in band dead band to realize each mode of operation, oil hydraulic motor actual speed is allowed to depart from rotating speed of target 25rpm, after exceeding this speed error scope, regulate automatically controlled variable displacement pump input signal, and then regulator solution pressure motor output speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610048549.7A CN105422522A (en) | 2016-01-25 | 2016-01-25 | Pump control hydraulic drive device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610048549.7A CN105422522A (en) | 2016-01-25 | 2016-01-25 | Pump control hydraulic drive device and method |
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| CN105422522A true CN105422522A (en) | 2016-03-23 |
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ID=55500979
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|---|---|---|---|
| CN201610048549.7A Pending CN105422522A (en) | 2016-01-25 | 2016-01-25 | Pump control hydraulic drive device and method |
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| CN (1) | CN105422522A (en) |
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| CN107605690A (en) * | 2017-10-09 | 2018-01-19 | 苏州大方特种车股份有限公司 | Hydraulic-driven high-pressure water pump device |
| CN110997078A (en) * | 2017-06-14 | 2020-04-10 | 原子能股份公司 | Mobile fire extinguishing system capable of generating foam through compression method |
| CN112539166A (en) * | 2020-11-06 | 2021-03-23 | 江苏徐工工程机械研究院有限公司 | Hydraulic control system and dredging equipment |
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