CN111706563B - Three-way speed regulating valve based on hydraulic motor-generator pressure compensator - Google Patents
Three-way speed regulating valve based on hydraulic motor-generator pressure compensator Download PDFInfo
- Publication number
- CN111706563B CN111706563B CN202010495275.2A CN202010495275A CN111706563B CN 111706563 B CN111706563 B CN 111706563B CN 202010495275 A CN202010495275 A CN 202010495275A CN 111706563 B CN111706563 B CN 111706563B
- Authority
- CN
- China
- Prior art keywords
- pressure
- inlet
- oil
- hydraulic motor
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
- F15B11/10—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor in which the servomotor position is a function of the pressure also pressure regulators as operating means for such systems, the device itself may be a position indicating system
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a three-way speed regulating valve based on a hydraulic motor-generator pressure compensator, wherein an oil inlet of a hydraulic motor (8) is connected with an oil inlet of a throttle valve (4); the oil outlet of the hydraulic motor (8) is connected with the oil outlet of the throttle valve (4); the first pressure sensor (6) is connected with an oil outlet of the throttle valve (4); the second pressure sensor (7) is connected with an oil inlet of the throttle valve (4); the torque input end of the motor controller (10) is connected with the generator (9); obtaining the inlet-outlet differential pressure delta p of the throttle valve (4) through the first pressure sensor (6) and the second pressure sensor (7), meanwhile, obtaining the inlet-outlet differential pressure of the hydraulic motor (8), and comparing the inlet-outlet differential pressure delta p with a target control differential pressure; when Δ p is smaller than the target control pressure difference, the motor controller (10) adjusts the torque T of the generator (9) to increase according to
The pressure difference delta p between the inlet and the outlet of the hydraulic motor (8) is increased, and the inlet pressure Pp is correspondingly increased, so that the pressure difference between the two ends of the throttle valve is increased.
Description
Technical Field
The invention relates to an electro-hydraulic control technology and a speed regulating valve, in particular to a three-way speed regulating valve based on a hydraulic motor-generator pressure compensator.
Background
In the aspect of hydraulic element and system energy saving technology, the hydraulic energy loss mainly comprises throttling loss, overflow loss and the like. The throttling loss mainly comprises inlet throttling loss, outlet throttling loss, bypass throttling loss and linkage throttling loss. Different types of hydraulic systems have different types of throttling losses. For example, in a single-pump multi-actuator throttle governor circuit, a large amount of energy is always consumed at the throttle orifice of the circuit with lower pressure. The volume speed regulating loop can avoid extra throttling loss and overflow loss, but the volume speed regulating system is difficult to match with a valve control throttling speed regulating system in controllability, and the valve control throttling technology mainly reduces the throttling loss to a certain extent through flow matching, but the minimum flow of a valve port is the minimum flow required by the speed of an actuator, and meanwhile, the pressure difference of the throttling valve port is difficult to be always ensured to be only the minimum working pressure difference required by the controllability.
The problem of overflow loss is one of the main reasons for the low efficiency of the hydraulic system, especially in the oil supply throttling speed regulation system of the fixed displacement pump. The outlet of the overflow valve is generally connected with an oil tank, the overflow valve works, the valve port differential pressure loss of the overflow valve is the inlet pressure of the overflow valve, the larger the overflow pressure grade is, the larger the valve port differential pressure loss is, the overflow flow is different according to different types of hydraulic systems, and along with the grade high pressure of the hydraulic systems, the problem of the overflow loss is increasingly serious. The overflow loss of the overflow valve is related to the type of the hydraulic system, the load condition during working and the operation mode of an operator. In a throttling speed regulating system adopting a three-way speed regulating valve, a fixed-difference overflow valve has an overflow pressure regulating function, and when the load changes, part of hydraulic oil always flows back to an oil tank through the overflow valve, so that the fixed-difference overflow valve always has overflow loss.
Disclosure of Invention
The invention aims at the defects in the prior art, and mainly aims to provide a three-way speed regulating valve based on a hydraulic motor-generator pressure compensator, which can realize the purpose of compensating the pressure difference at two ends of a throttling valve port.
In order to achieve the purpose, the invention adopts the following technical scheme:
a three-way speed regulating valve based on a hydraulic motor-generator pressure compensator comprises a throttle valve, a first pressure sensor, a second pressure sensor, a hydraulic motor, a generator and a motor controller;
the oil inlet of the hydraulic motor is connected with the oil inlet of the throttle valve; the oil outlet of the hydraulic motor is connected with the oil outlet of the throttle valve; the first pressure sensor is connected with an oil outlet of the throttle valve; the second pressure sensor is connected with an oil inlet of the throttle valve; the torque input end of the motor controller is connected with the generator;
obtaining the inlet-outlet differential pressure delta p of the throttle valve through the first pressure sensor and the second pressure sensor, meanwhile, the inlet-outlet differential pressure of the hydraulic motor, and comparing the inlet-outlet differential pressure delta p with a target control differential pressure; when Δ p is less than the target control pressure differential, the motor controller regulates the torque T of the generator to increase, based on
It can be known that the inlet-outlet differential pressure Δ p of the hydraulic motor increases, so the inlet pressure Pp also increases correspondingly, and at this time, the differential pressure across the throttle valve is stabilized again near the target control differential pressure.
In a preferred embodiment: the hydraulic pump, the overflow valve, the reversing valve, the throttle valve, the actuator and the storage battery are also included;
the oil outlet of the hydraulic pump is connected with the oil inlet of the overflow valve; the oil outlet of the overflow valve is connected with an oil tank; the oil outlet of the hydraulic pump is connected with the oil inlet p of the reversing valve; an oil return port T of the reversing valve is connected with an oil tank; an oil outlet A of the reversing valve is connected with an oil inlet of the throttle valve; an oil outlet A of the reversing valve is connected with an oil inlet of the hydraulic motor; the oil outlet of the throttle valve is connected with the oil inlet of the actuator; the oil outlet of the actuator is connected with an oil outlet B of the reversing valve; the storage battery is connected with the current output end of the motor controller.
In a preferred embodiment: the generator and the hydraulic motor are coaxially connected.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
the invention provides a three-way speed regulating valve based on a hydraulic motor-generator pressure compensator, which is additionally provided with a hydraulic motor-generator as the pressure compensator, replaces a fixed-difference overflow valve in the traditional three-way speed regulating valve, is connected with a throttle valve in parallel, can recover redundant differential pressure loss, and can ensure constant differential pressure at the inlet and the outlet of the throttle valve, thereby ensuring the speed stability of an actuating element. By adopting the speed regulating loop behind the pressure compensator, the oil supply pressure Pp of the hydraulic pump changes along with the load pressure, and the power loss of the system is small. Because the hydraulic motor and the throttle valve are connected in parallel, the pressure difference delta p between the two ends of the throttle valve is the pressure difference between the inlet and the outlet of the hydraulic motor. When the load pressure p1 changes, for example, the load pressure p1 increases and the differential pressure Δ p across the throttle valve (Δ p — p1) decreases, and when the differential pressure across the throttle valve is smaller than the target control differential pressure, the torque T of the generator controlled by the motor controller increases, and the torque T is increased according to the change in the load pressure p1
It can be known that the inlet-outlet differential pressure Δ p of the hydraulic motor increases, so the inlet pressure Pp also increases correspondingly, and at this time, the differential pressure across the throttle valve is stabilized again near the target control differential pressure.
Similarly, when the load pressure p1 becomes smaller, the differential pressure Δ p across the throttle valve (Δ p — p1) becomes larger, and when the differential pressure across the throttle valve is larger than the target control differential pressure, the torque T of the generator regulated by the motor controller decreases, and the torque T is reduced according to the load pressure p1
It can be known that the inlet-outlet pressure difference Δ p of the hydraulic motor is reduced, so the inlet pressure Pp is correspondingly reduced, and the pressure difference between the two ends of the throttle valve is stabilized again at the target controlThe differential pressure is approximate.
In the governor circuit of the pressure compensator consisting of a hydraulic motor-generator, the supply pressure of the hydraulic pump varies with the load pressure. When the load pressure changes, the torque T of the generator is adjusted to control the pressure difference delta p of the inlet and the outlet of the hydraulic motor, and further the oil supply pressure of the hydraulic pump is adjusted, so that the pressure difference between the two ends of the throttle valve is stabilized again at a smaller pressure difference required for ensuring the working characteristics. The flow control mode of the actuator is still throttle control, but the differential pressure of a throttle valve port in the speed regulating valve is changed into volume control from throttle control, and meanwhile, the redundant differential pressure loss energy is recovered through an energy recovery unit. The invention not only can play the role of pressure stabilizing difference of a fixed difference overflow valve in the traditional three-way speed regulating valve, but also can realize the recovery and conversion of valve port throttling loss, reduce the traditional throttling loss, effectively avoid extra overflow loss and improve the efficiency of a hydraulic system.
Drawings
FIG. 1 is a schematic diagram of the structure of the preferred embodiment of the present invention;
the attached drawings indicate the following:
1. hydraulic pump 2, overflow valve
3. Reversing valve 4 and throttle valve
5. Actuator 6 and first pressure sensor
7. Second pressure sensor 8, hydraulic motor
9. Generator 10 and motor controller
11. Storage battery
Detailed Description
Referring to fig. 1, a specific structure of a preferred embodiment of the present invention is shown, which includes a hydraulic pump (1), an overflow valve (2), a reversing valve (3), a throttle valve (4), an actuator (5), a first pressure sensor (6), a second pressure sensor (7), a hydraulic motor (8), a generator (9), a motor controller (10), and a battery (11); wherein:
the oil outlet of the hydraulic pump (1) is connected with the oil inlet of the overflow valve (2); the oil outlet of the overflow valve (2) is connected with an oil tank; an oil outlet of the hydraulic pump (1) is connected with an oil inlet p of the reversing valve (3); an oil return port T of the reversing valve (3) is connected with an oil tank; an oil outlet A of the reversing valve (3) is connected with an oil inlet of the throttle valve (4); an oil outlet A of the reversing valve (3) is connected with an oil inlet of the hydraulic motor (8); an oil outlet of the throttle valve (4) is connected with an oil inlet of the actuator (6); the oil outlet of the throttle valve (4) is connected with the oil outlet of the hydraulic motor (8); the oil outlet of the actuator (6) is connected with the oil outlet B of the reversing valve (3); the first pressure sensor (6) is connected with an oil outlet of the throttle valve (6); the second pressure sensor (7) is connected with an oil inlet of the throttle valve (4); the torque input end of the motor controller (10) is connected with the generator (9); the storage battery (11) is connected with the current output end of the motor controller (10).
Referring to fig. 1, the operation principle of the embodiment is detailed as follows:
the pressure compensator based on the hydraulic motor-generator replaces a fixed-difference overflow valve in the traditional three-way speed regulating valve and is connected with the throttle valve in parallel, so that redundant differential pressure loss can be recovered, and the constant differential pressure of the inlet and the outlet of the throttle valve can be ensured, thereby ensuring the speed stability of an actuating element. By adopting the speed regulating loop behind the pressure compensator, the oil supply pressure Pp of the hydraulic pump changes along with the load pressure, and the power loss of the system is small. Because the hydraulic motor 8 and the throttle valve 4 are connected in parallel, the pressure difference Δ p between the two ends of the throttle valve 4 is the pressure difference between the inlet and the outlet of the hydraulic motor 8. When the load pressure p1 changes, for example, the load pressure p1 increases and the differential pressure Δ p across the throttle 4 (Δ p — p1) decreases, and when the differential pressure across the throttle is smaller than the target control differential pressure, the motor controller 10 adjusts the torque T of the generator 9 to increase, and based on the increase in the differential pressure across the throttle, the motor controller 10 adjusts the torque T of the generator 9 to increase
It can be seen that the inlet-outlet differential pressure Δ p of the hydraulic motor 8 increases, so the inlet pressure Pp also increases accordingly, and at this time, the differential pressure across the throttle valve 4 is stabilized again near the target control differential pressure.
Similarly, when the load pressure p1 becomes smaller, the differential pressure Δ p across the throttle valve 4 (Δ p — p1) becomes larger, and the differential pressure across the throttle valve port becomes larger than the differential pressure across the throttle valve portThe target control pressure difference, the motor controller 10 regulates the torque T of the generator 9 to decrease according to
It can be seen that the inlet-outlet differential pressure Δ p of the hydraulic motor 8 is reduced, so the inlet pressure Pp is correspondingly reduced, and at this time, the differential pressure across the throttle valve 4 is stabilized again near the target control differential pressure. The design of this embodiment focuses on: the hydraulic motor-generator forms a differential pressure compensator of the throttle valve port, and the differential pressure of the throttle valve port is controlled only to be a minimum differential pressure which ensures the controllability, namely a target differential pressure, by adjusting the torque of the generator. The throttling control of the differential pressure compensator is changed into volume control, so that the throttling loss is reduced, and the redundant differential pressure loss can be recycled.
The above examples are provided only for illustrating the present invention and are not intended to limit the present invention. Changes, modifications, etc. to the above-described embodiments are intended to fall within the scope of the claims of the present invention as long as they are in accordance with the technical spirit of the present invention.
Claims (3)
1. The utility model provides a tee bend speed governing valve based on hydraulic motor-generator pressure compensator which characterized in that: the system comprises a throttle valve (4), a first pressure sensor (6), a second pressure sensor (7), a hydraulic motor (8), a generator (9) and a motor controller (10);
an oil inlet of the hydraulic motor (8) is connected with an oil inlet of the throttle valve (4); an oil outlet of the hydraulic motor (8) is connected with an oil outlet of the throttle valve (4); the first pressure sensor (6) is connected with an oil outlet of the throttle valve (4); the second pressure sensor (7) is connected with an oil inlet of the throttle valve (4); the torque input end of the motor controller (10) is connected with the generator (9);
obtaining the inlet-outlet differential pressure delta p of the throttle valve (4) through the first pressure sensor (6) and the second pressure sensor (7), meanwhile, obtaining the inlet-outlet differential pressure delta p of the hydraulic motor (8), and comparing the inlet-outlet differential pressure delta p with a target control differential pressure; when Δ p is smaller than the target control pressure difference, the motor controller (10) adjusts the torque T of the generator (9) to increase according to
The pressure difference delta p between the inlet and the outlet of the hydraulic motor (8) is increased, and the inlet pressure Pp is correspondingly increased; wherein VmIs the displacement of the hydraulic motor (8).
2. The three-way speed regulating valve based on the hydraulic motor-generator pressure compensator as claimed in claim 1, wherein: the hydraulic control system also comprises a hydraulic pump (1), an overflow valve (2), a reversing valve (3), an actuator (5) and a storage battery (11);
the oil outlet of the hydraulic pump (1) is connected with the oil inlet of the overflow valve (2); the oil outlet of the overflow valve (2) is connected with an oil tank; an oil outlet of the hydraulic pump (1) is connected with an oil inlet p of the reversing valve (3); an oil return port T of the reversing valve (3) is connected with an oil tank; an oil outlet A of the reversing valve (3) is connected with an oil inlet of the throttle valve (4); an oil outlet A of the reversing valve (3) is connected with an oil inlet of the hydraulic motor (8); an oil outlet of the throttle valve (4) is connected with an oil inlet of the actuator (5); the oil outlet of the actuator (5) is connected with the oil outlet B of the reversing valve (3); the storage battery (11) is connected with the current output end of the motor controller (10).
3. The three-way speed regulating valve based on the hydraulic motor-generator pressure compensator as claimed in claim 1, wherein: the generator (9) is coaxially connected with the hydraulic motor (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495275.2A CN111706563B (en) | 2020-06-03 | 2020-06-03 | Three-way speed regulating valve based on hydraulic motor-generator pressure compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495275.2A CN111706563B (en) | 2020-06-03 | 2020-06-03 | Three-way speed regulating valve based on hydraulic motor-generator pressure compensator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111706563A CN111706563A (en) | 2020-09-25 |
| CN111706563B true CN111706563B (en) | 2022-05-03 |
Family
ID=72539359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010495275.2A Active CN111706563B (en) | 2020-06-03 | 2020-06-03 | Three-way speed regulating valve based on hydraulic motor-generator pressure compensator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111706563B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113107742B (en) * | 2021-05-28 | 2023-05-26 | 北京天玛智控科技股份有限公司 | Differential pressure type outer rotor hydroelectric generator and pressure regulating system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10288202A (en) * | 1997-04-15 | 1998-10-27 | Komatsu Eng Kk | Oil hydraulic circuit for generator driving hydraulic motor |
| JP2007139137A (en) * | 2005-11-21 | 2007-06-07 | Shimadzu Corp | Hydraulic motor control mechanism |
| CN101408213A (en) * | 2008-11-11 | 2009-04-15 | 浙江大学 | Energy recovery system of hybrid power engineering machinery energy accumulator-hydraulic motor |
| CN104454715A (en) * | 2014-12-03 | 2015-03-25 | 华侨大学 | Novel secondary regulation system based on electrical control |
| CN104481942A (en) * | 2014-12-04 | 2015-04-01 | 华侨大学 | Hydraulic device with single pump and double actuators |
| CN207920989U (en) * | 2018-03-15 | 2018-09-28 | 四川职业技术学院 | A kind of throttling speed control circuit for maintaining hydraulic pressure system speed to stablize |
-
2020
- 2020-06-03 CN CN202010495275.2A patent/CN111706563B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10288202A (en) * | 1997-04-15 | 1998-10-27 | Komatsu Eng Kk | Oil hydraulic circuit for generator driving hydraulic motor |
| JP2007139137A (en) * | 2005-11-21 | 2007-06-07 | Shimadzu Corp | Hydraulic motor control mechanism |
| CN101408213A (en) * | 2008-11-11 | 2009-04-15 | 浙江大学 | Energy recovery system of hybrid power engineering machinery energy accumulator-hydraulic motor |
| CN104454715A (en) * | 2014-12-03 | 2015-03-25 | 华侨大学 | Novel secondary regulation system based on electrical control |
| CN104481942A (en) * | 2014-12-04 | 2015-04-01 | 华侨大学 | Hydraulic device with single pump and double actuators |
| CN207920989U (en) * | 2018-03-15 | 2018-09-28 | 四川职业技术学院 | A kind of throttling speed control circuit for maintaining hydraulic pressure system speed to stablize |
Non-Patent Citations (1)
| Title |
|---|
| 液压马达能量回收系统操作性能研究;林添良，叶月影，王庆丰;《中国机械工程》;20131130;第2948-2954页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111706563A (en) | 2020-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102505996B (en) | Power matching system and method for electric control engine and variable hydraulic pump | |
| CN207762060U (en) | A kind of overhead working truck system | |
| CN113202833B (en) | Load port independent control system matched with electro-hydraulic flow | |
| CN108533546B (en) | Hydraulic excavator power system adopting double-pump direct drive and differential fast forward automatic switching | |
| CN111255007A (en) | Loader constant-variable hydraulic system based on load signal direct control | |
| CN102261351A (en) | Simple proportional load sensitive hydraulic system | |
| CN203516249U (en) | Load-sensitive feedback control system for top drive drilling machine hydraulic pump station | |
| CN111456746A (en) | Super-large-diameter shield multi-mode propulsion system and control method | |
| CN111706563B (en) | Three-way speed regulating valve based on hydraulic motor-generator pressure compensator | |
| CN110725817A (en) | High-energy-efficiency control method of servo system for independently adjusting electrohydraulic position at inlet and outlet based on proportional overflow valve | |
| CN105604996A (en) | Load-sensitive control system, control method and hydraulic system | |
| CN111577682B (en) | Two-way speed regulating valve based on variable pressure difference active control | |
| US11813914B2 (en) | Hydraulic active suspension flow control system | |
| CN111706564A (en) | Two-way speed regulating valve based on volume variable pressure difference active control | |
| CN107503997B (en) | Back pressure and power matching hydraulic hybrid regulate and control double actuator systems | |
| CN113757197B (en) | Constant pressure control method of pump station | |
| CN205225901U (en) | Laser leveling machine hydraulic drive control system | |
| CN202730562U (en) | A hydraulic system device for track layer traveling power matching | |
| CN219492725U (en) | Novel multi-actuator pump control variable-voltage differential speed regulation system | |
| CN2818871Y (en) | Feedback loading multi-path valve | |
| CN116717511B (en) | System and method for regenerating and controlling independent oil paths of movable arms | |
| CN105156379A (en) | Energy-saving constant-pressure oil source system and control method thereof | |
| CN209800386U (en) | hydraulic combination valve for controlling rotation of roller in pipe cable equipment | |
| CN215596034U (en) | Load sensitive hydraulic system for foam molding machine | |
| CN113833051B (en) | Hydraulic excavator rotating speed adjusting and testing system and method based on ADTC active control function of engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |