CN112797041A - Hydraulic motor bidirectional pressure control system and method thereof - Google Patents
Hydraulic motor bidirectional pressure control system and method thereof Download PDFInfo
- Publication number
- CN112797041A CN112797041A CN202110116512.4A CN202110116512A CN112797041A CN 112797041 A CN112797041 A CN 112797041A CN 202110116512 A CN202110116512 A CN 202110116512A CN 112797041 A CN112797041 A CN 112797041A
- Authority
- CN
- China
- Prior art keywords
- valve
- oil
- pressure
- hydraulic motor
- proportional reversing
- 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.)
- Pending
Links
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 230000001360 synchronised effect Effects 0.000 claims abstract description 16
- 230000003068 static effect Effects 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 99
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic motor bidirectional pressure control system and a method thereof, wherein the system comprises a proportional reversing valve, a bidirectional balance valve, a synchronous valve, a hydraulic motor, an automatic control unit, a pressure sensor and a shuttle valve; the oil inlet of the proportional reversing valve is connected with a pressure oil path, the oil return port of the proportional reversing valve is connected with an oil return path, two oil outlets of the proportional reversing valve are respectively connected with two oil inlets of the bidirectional balance valve in a one-to-one correspondence mode through pipelines, the left oil outlet of the bidirectional balance valve is connected with the confluence port of the synchronous valve, two shunt ports of the synchronous valve are respectively connected with two oil ports of two hydraulic motors in a corresponding mode, the oil outlets of the two hydraulic motors are connected with the right oil outlet of the bidirectional balance valve in a parallel connection mode, two oil inlets of the shuttle valve are respectively connected with two oil outlets of the bidirectional balance valve in a parallel connection mode through pipelines, the oil outlet of the shuttle valve is connected with the oil return path, the oil path of the oil outlet of the shuttle valve is connected with a pressure sensor in an input point of the automatic control unit. The invention solves the problems of hidden danger of derailment of a rail running trolley driven by a hydraulic motor, eccentric wear of steel wheels and pits formed in places where rails are started more.
Description
Technical Field
The invention relates to the technical field of hydraulic control, in particular to a hydraulic motor bidirectional pressure control system and a method thereof.
Background
At present, two driving steel wheels of a domestic garbage compressor rail travelling trolley are mostly driven by a hydraulic motor, and the driving control of the hydraulic motor is a working mode of adopting a hydraulic system oil source of a garbage compressor to directly drive and control. This mode of operation: 1. the pressure set value of an oil source overflow valve of a hydraulic system of the garbage compressor is much larger than the pressure required by a hydraulic motor to drive steel wheels, so that when the two driving steel wheels are asynchronous, the steel wheels easily climb out of a steel rail to cause derailment accidents; 2. at the moment when the hydraulic motor starts to walk, the pressure of an oil source provided by a hydraulic system of the garbage compressor is too large, so that the force output by the motor is far greater than the static friction force between the steel wheel and the rail, the steel wheel and the rail slip, the abrasion between the rail and the steel wheel is greatly increased, the compressor works for a period of time under the condition, the steel wheel is eccentrically worn, the compressor bumps and shakes during walking, other parts are damaged, and the rail is easily ground out of pits at places where the rail is started, so that the compressor is difficult to start and run.
Disclosure of Invention
The invention aims to provide a hydraulic motor bidirectional pressure control system and a method thereof, which solve the problems of potential derailment hazards of a rail travelling trolley driven by a hydraulic motor, eccentric wear of steel wheels and pits of a rail ground at places with a large number of starts.
The technical scheme adopted by the invention is as follows:
a hydraulic motor bidirectional pressure control system comprises a proportional reversing valve, a bidirectional balance valve, a synchronous valve, a hydraulic motor, an automatic control unit, a pressure sensor and a shuttle valve; the oil inlet of the proportional reversing valve is connected with a pressure oil path, the oil return port of the proportional reversing valve is connected with an oil return path, two oil outlets of the proportional reversing valve are respectively connected with two oil inlets of the bidirectional balance valve in a one-to-one correspondence mode through pipelines, the left oil outlet of the bidirectional balance valve is connected with the confluence port of the synchronous valve, two shunt ports of the synchronous valve are respectively connected with two oil ports of two hydraulic motors in a corresponding mode, the oil outlets of the two hydraulic motors are connected with the right oil outlet of the bidirectional balance valve in a parallel connection mode, two oil inlets of the shuttle valve are respectively connected with two oil outlets of the bidirectional balance valve in a parallel connection mode through pipelines, the oil outlet of the shuttle valve is connected with the oil return path, the oil path of the oil outlet of the shuttle valve is connected with a pressure sensor in an input point of the automatic control unit.
Furthermore, as a better implementation mode, the hydraulic control system further comprises a one-way valve, an oil return port of the proportional reversing valve is connected with an oil inlet of the one-way valve through a pipeline, an oil outlet of the one-way valve is connected to an oil return path, and the one-way valve is used for preventing the rail running trolley which stops due to the fact that an oil return back pressure rushes open a balance valve when other hydraulic execution mechanisms of the compressor act.
Further, as a preferred embodiment, the oil outlet of the shuttle valve is connected with the oil return circuit through an overflow valve.
Further, as a preferred embodiment, the pressure sensor is connected in parallel to an oil path between an oil outlet of the shuttle valve and an oil inlet of the overflow valve.
A bidirectional pressure control method for a hydraulic motor comprises the following steps:
step 1, the automatic control unit gives a certain current to the electromagnet at the corresponding end side of the proportional reversing valve so as to move the valve core of the proportional reversing valve to a certain opening degree of the working position at the corresponding end side;
step 2, detecting the oil way pressure between the oil outlet of the shuttle valve and the oil inlet of the overflow valve in real time by a pressure sensor and transmitting the oil way pressure to an automatic control unit;
step 4, an overflow valve is opened to limit pressure, and simultaneously, the automatic control unit stops the current of the electromagnet at the corresponding end side of the proportional reversing valve to enable a valve core of the proportional reversing valve to return to a middle position, so that the bidirectional balance valve locks an oil inlet and return path of the hydraulic motor, and simultaneously, the automatic control unit sends out a steel wheel and steel rail locking alarm;
and 6, reducing the current of the electromagnet at the end side corresponding to the proportional solenoid valve by the automatic control unit, further reducing the driving pressure of the hydraulic motor and executing the step 2.
Further, as a preferred embodiment, the set value of the overflow valve in the step 3 is lower than the pressure value required by the steel wheel to climb out of the rail.
By adopting the technical scheme, the invention has the following beneficial effects: 1. the derailment accident of the compressor caused by the ultrahigh driving pressure of the hydraulic motor is avoided; 2. the damage of other parts caused by bumping and shaking of the compressor during walking due to eccentric wear of the steel wheel is avoided; 3. the problem that the compressor is difficult to start and drive because the pits are easily ground on the rail at a place with a large number of starts is avoided.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and the detailed description;
fig. 1 is a schematic structural diagram of a bi-directional pressure control system of a hydraulic motor according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1, the present invention discloses a hydraulic motor bidirectional pressure control system, which comprises a proportional directional valve, a bidirectional balance valve, a synchronous valve, a hydraulic motor, an automatic control unit, a pressure sensor and a shuttle valve; the oil inlet of the proportional reversing valve is connected with a pressure oil path, the oil return port of the proportional reversing valve is connected with an oil return path, two oil outlets of the proportional reversing valve are respectively connected with two oil inlets of the bidirectional balance valve in a one-to-one correspondence mode through pipelines, the left oil outlet of the bidirectional balance valve is connected with the confluence port of the synchronous valve, two shunt ports of the synchronous valve are respectively connected with two oil ports of two hydraulic motors in a corresponding mode, the oil outlets of the two hydraulic motors are connected with the right oil outlet of the bidirectional balance valve in a parallel connection mode, two oil inlets of the shuttle valve are respectively connected with two oil outlets of the bidirectional balance valve in a parallel connection mode through pipelines, the oil outlet of the shuttle valve is connected with the oil return path, the oil path of the oil outlet of the shuttle valve is connected with a pressure sensor in an input point of the automatic control unit.
Furthermore, as a better implementation mode, the hydraulic control system further comprises a one-way valve, an oil return port of the proportional reversing valve is connected with an oil inlet of the one-way valve through a pipeline, an oil outlet of the one-way valve is connected to an oil return path, and the one-way valve is used for preventing the rail running trolley which stops due to the fact that an oil return back pressure rushes open a balance valve when other hydraulic execution mechanisms of the compressor act.
Further, as a preferred embodiment, the oil outlet of the shuttle valve is connected with the oil return circuit through an overflow valve.
Further, as a preferred embodiment, the pressure sensor is connected in parallel to an oil path between an oil outlet of the shuttle valve and an oil inlet of the overflow valve.
A bidirectional pressure control method for a hydraulic motor comprises the following steps:
step 1, the automatic control unit gives a certain current to the electromagnet at the corresponding end side of the proportional reversing valve so as to move the valve core of the proportional reversing valve to a certain opening degree of the working position at the corresponding end side;
step 2, detecting the oil way pressure between the oil outlet of the shuttle valve and the oil inlet of the overflow valve in real time by a pressure sensor and transmitting the oil way pressure to an automatic control unit;
step 4, an overflow valve is opened to limit pressure, and simultaneously, the automatic control unit stops the current of the electromagnet at the corresponding end side of the proportional reversing valve to enable a valve core of the proportional reversing valve to return to a middle position, so that the bidirectional balance valve locks an oil inlet and return path of the hydraulic motor, and simultaneously, the automatic control unit sends out a steel wheel and steel rail locking alarm;
and 6, reducing the current of the electromagnet at the end side corresponding to the proportional solenoid valve by the automatic control unit, further reducing the driving pressure of the hydraulic motor and executing the step 2.
Further, as a preferred embodiment, the set value of the overflow valve in the step 3 is lower than the pressure value required by the steel wheel to climb out of the rail.
The present invention will be described in detail below:
as shown in figure 1, a pressure oil path of the control system is connected to an oil inlet of a serial number 1 proportional reversing valve, two oil outlets of the serial number 1 proportional reversing valve are respectively connected to an oil inlet of a serial number 2 bidirectional balance valve through a pipeline, and an oil return port of the serial number 1 proportional reversing valve is connected to an oil inlet of a serial number 9 one-way valve through a pipeline. An oil outlet of a serial number 9 one-way valve is connected to the oil return path, and the serial number 9 one-way valve is used for preventing the oil return back pressure generated when other hydraulic actuating mechanisms of the compressor act from flushing a serial number 2 bidirectional balance valve to cause the stopped track running trolley to slide. The left oil outlet of the serial number 2 bidirectional balance valve is connected to the confluence port of the serial number 3 synchronous valve, two shunt ports of the serial number 3 synchronous valve are respectively connected to the two oil ports A of the two hydraulic motors of the serial number 4, and the other two oil ports B of the two hydraulic motors of the serial number 4 are connected to the right oil outlet of the serial number 2 bidirectional balance valve in parallel through an oil way. Two oil inlets of the shuttle valve with the serial number 7 are respectively connected in parallel with two oil outlets of the bidirectional balance valve with the serial number 2 through pipelines, and an oil outlet of the shuttle valve with the serial number 7 is connected with an oil inlet of the overflow valve with the serial number 8 through a pipeline. The oil outlet of the overflow valve with the serial number of 8 is connected to an oil return path. And a serial number 6 pressure sensor is connected in parallel on an oil path between an oil outlet of the serial number 7 shuttle valve and an oil inlet of the serial number 8 overflow valve. Two output points of the serial number 5 automatic control unit are respectively connected with the proportional electromagnets at two ends of the serial number 1 proportional reversing valve through electric wires, and the serial number 6 pressure sensor is connected with the input point of the serial number 5 automatic control unit through an electric wire.
When the serial number 5 automatic control unit gives a certain current to the left end electromagnet a of the serial number 1 proportional reversing valve, the left end electromagnet a pushes the valve core of the serial number 1 proportional reversing valve to open for a certain opening, the pressure oil of the pressure oil path flows out from the port A of the serial number 1 proportional reversing valve, the left end one-way valve of the serial number 2 bidirectional balance valve simultaneously opens the balance valve at the right end, then the pressure oil enters the confluence port of the serial number 3 synchronous valve, and is evenly shunted to the port A at the left ends of the two hydraulic motors of the serial number 4 through the serial number 3 synchronous valve, so that the two hydraulic motors of the serial number 4 are in consistent rotating speed, and the rail travelling trolley is driven to travel. Part of pressure oil enters a lower oil inlet of the serial number 7 shuttle valve through an oil way connected in parallel with an oil outlet at the left end of the serial number 2 bidirectional balance valve, so that a valve core of the serial number 7 shuttle valve moves upwards, and the pressure oil enters an oil way between an oil outlet of the serial number 7 shuttle valve and an oil inlet of a serial number 8 overflow valve, so that a serial number 6 pressure sensor can read the driving pressure of the hydraulic motor in real time and transmit the driving pressure to a serial number 5 automatic control unit. When the motor driving force corresponding to the pressure value read by the pressure sensor with the serial number 6 in real time is larger than the maximum static friction force between the steel wheel and the rail, the automatic control unit with the serial number 5 reduces the current of the electromagnet a at the left end of the proportional electromagnetic valve with the serial number 1, so that the opening degree of the valve core of the proportional reversing valve with the serial number 1 is reduced, the driving pressure of the hydraulic motor with the serial number 4 is reduced, and the problems that the steel wheel is eccentrically worn due to the sliding of the steel wheel and the rail is easily abraded out of a pit in a place with a large number of starts, so that. When the steel wheel is clamped with the rail, the pressure of the pressure oil rises sharply and exceeds a set value of the serial number 8 overflow valve (the set value is lower than the pressure value required by the steel wheel to climb out of the rail), the serial number 8 overflow valve is opened to limit the pressure, meanwhile, the serial number 5 automatic control unit stops the current of the electromagnet a at the left end of the serial number 1 proportional reversing valve and closes the opening of the valve core of the serial number 1 proportional reversing valve, so that the derailment accident of the rail running trolley is avoided, and meanwhile, the automatic control unit sends out a steel wheel and rail clamping alarm.
The working process of the electromagnet at the right end of the proportional reversing valve is the same as the working process of the electromagnet at the right end of the proportional reversing valve.
In summary, it can be seen that the hydraulic motor bidirectional pressure control system: 1. the derailment accident of the compressor caused by the ultrahigh driving pressure of the hydraulic motor is avoided; 2. the damage of other parts caused by bumping and shaking of the compressor during walking due to eccentric wear of the steel wheel is avoided; 3. the problem that the compressor is difficult to start and drive because the pits are easily ground on the rail at a place with a large number of starts is avoided.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (6)
1. A hydraulic motor bi-directional pressure control system characterized in that: the automatic control system comprises a proportional reversing valve, a bidirectional balance valve, a synchronous valve, a hydraulic motor, an automatic control unit, a pressure sensor and a shuttle valve; the oil inlet of the proportional reversing valve is connected with a pressure oil path, the oil return port of the proportional reversing valve is connected with an oil return path, two oil outlets of the proportional reversing valve are respectively connected with two oil inlets of the bidirectional balance valve in a one-to-one correspondence mode through pipelines, the left oil outlet of the bidirectional balance valve is connected with the confluence port of the synchronous valve, two shunt ports of the synchronous valve are respectively connected with two oil ports of two hydraulic motors in a corresponding mode, the oil outlets of the two hydraulic motors are connected with the right oil outlet of the bidirectional balance valve in a parallel connection mode, two oil inlets of the shuttle valve are respectively connected with two oil outlets of the bidirectional balance valve in a parallel connection mode through pipelines, the oil outlet of the shuttle valve is connected with the oil return path, the oil path of the oil outlet of the shuttle valve is connected with a pressure sensor in an input point of the automatic control unit.
2. A hydraulic motor bi-directional pressure control system as claimed in claim 1 wherein: the rail-mounted running trolley is characterized by further comprising a one-way valve, an oil return port of the proportional reversing valve is connected with an oil inlet of the one-way valve through a pipeline, an oil outlet of the one-way valve is connected to an oil return path, and the one-way valve is used for preventing the rail-mounted running trolley from sliding due to the fact that oil return backpressure when other hydraulic actuating mechanisms of the compressor act flushes the balance valve to stop.
3. A hydraulic motor bi-directional pressure control system as claimed in claim 1 wherein: the oil outlet of the shuttle valve is connected with an oil return path through an overflow valve.
4. A hydraulic motor bi-directional pressure control system as claimed in claim 3 wherein: the pressure sensor is connected in parallel on an oil path between an oil outlet of the shuttle valve and an oil inlet of the overflow valve.
5. A bidirectional pressure control method for a hydraulic motor, the bidirectional pressure control system for a hydraulic motor according to any one of claims 1 to 4, characterized in that: the control method comprises the following steps:
step 1, the automatic control unit gives a certain current to the electromagnet at the corresponding end side of the proportional reversing valve so as to move the valve core of the proportional reversing valve to a certain opening degree of the working position at the corresponding end side;
step 2, detecting the oil way pressure between the oil outlet of the shuttle valve and the oil inlet of the overflow valve in real time by a pressure sensor and transmitting the oil way pressure to an automatic control unit;
step 3, judging whether the motor driving force corresponding to the read driving pressure is larger than a set value of an overflow valve by the automatic control unit; if yes, executing step 4; otherwise, executing step 5;
step 4, an overflow valve is opened to limit pressure, and simultaneously, the automatic control unit stops the current of the electromagnet at the corresponding end side of the proportional reversing valve to enable a valve core of the proportional reversing valve to return to a middle position, so that the bidirectional balance valve locks an oil inlet and return path of the hydraulic motor, and simultaneously, the automatic control unit sends out a steel wheel and steel rail locking alarm;
step 5, judging whether the driving force of the motor corresponding to the read driving pressure is larger than the maximum static friction force between the steel wheel and the rail by the automatic control unit; if yes, executing step 6; otherwise, executing step 2;
and 6, reducing the current of the electromagnet at the end side corresponding to the proportional solenoid valve by the automatic control unit, further reducing the driving pressure of the hydraulic motor and executing the step 2.
6. The hydraulic motor bidirectional pressure control method according to claim 5, characterized in that: and 3, the set value of the overflow valve is lower than the pressure value required by the steel wheel to climb out of the rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110116512.4A CN112797041A (en) | 2021-01-28 | 2021-01-28 | Hydraulic motor bidirectional pressure control system and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110116512.4A CN112797041A (en) | 2021-01-28 | 2021-01-28 | Hydraulic motor bidirectional pressure control system and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112797041A true CN112797041A (en) | 2021-05-14 |
Family
ID=75812374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110116512.4A Pending CN112797041A (en) | 2021-01-28 | 2021-01-28 | Hydraulic motor bidirectional pressure control system and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112797041A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655823A (en) * | 2021-08-26 | 2021-11-16 | 攀钢集团攀枝花钢钒有限公司 | Accurate positioning parking control system for reciprocating equipment |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000032941A1 (en) * | 1998-11-27 | 2000-06-08 | Hitachi Construction Machinery Co., Ltd. | Revolution control device |
| CN102912823A (en) * | 2012-11-09 | 2013-02-06 | 浙江大学 | Rotary energy saving system of excavator |
| CN103206419A (en) * | 2013-04-18 | 2013-07-17 | 三一汽车起重机械有限公司 | Rotary hydraulic system and construction machinery |
| CN103628512A (en) * | 2013-11-15 | 2014-03-12 | 中外合资沃得重工（中国）有限公司 | Rotary hydraulic control device of excavator movable arm platform and control method |
| CN103924626A (en) * | 2014-04-02 | 2014-07-16 | 华侨大学 | Energy-saving rotary table drive system and drive control method of electric drive hydraulic excavator |
| CN204140527U (en) * | 2014-09-12 | 2015-02-04 | 鞍钢集团工程技术有限公司 | A kind of hydraulic system of walking-beam furnace |
| CN104554432A (en) * | 2014-05-29 | 2015-04-29 | 四川大学 | Novel engineering machine steer-by-wire system |
| CN105485080A (en) * | 2014-09-24 | 2016-04-13 | 中联重科股份有限公司 | Rotary motor control system and control method thereof |
| CN106678090A (en) * | 2017-01-10 | 2017-05-17 | 辽宁三三工业有限公司 | Novel hydraulic rotation mechanism of segment erector |
| CN109019381A (en) * | 2018-09-14 | 2018-12-18 | 杭州流控机器制造有限公司 | A kind of negative load control loop of the hydraulic motor for elevator winch and its method |
| CN210623231U (en) * | 2019-09-30 | 2020-05-26 | 宁波中意液压马达有限公司 | Hydraulic pressure slewer buffer system |
-
2021
- 2021-01-28 CN CN202110116512.4A patent/CN112797041A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000032941A1 (en) * | 1998-11-27 | 2000-06-08 | Hitachi Construction Machinery Co., Ltd. | Revolution control device |
| CN102912823A (en) * | 2012-11-09 | 2013-02-06 | 浙江大学 | Rotary energy saving system of excavator |
| CN103206419A (en) * | 2013-04-18 | 2013-07-17 | 三一汽车起重机械有限公司 | Rotary hydraulic system and construction machinery |
| CN103628512A (en) * | 2013-11-15 | 2014-03-12 | 中外合资沃得重工（中国）有限公司 | Rotary hydraulic control device of excavator movable arm platform and control method |
| CN103924626A (en) * | 2014-04-02 | 2014-07-16 | 华侨大学 | Energy-saving rotary table drive system and drive control method of electric drive hydraulic excavator |
| CN104554432A (en) * | 2014-05-29 | 2015-04-29 | 四川大学 | Novel engineering machine steer-by-wire system |
| CN204140527U (en) * | 2014-09-12 | 2015-02-04 | 鞍钢集团工程技术有限公司 | A kind of hydraulic system of walking-beam furnace |
| CN105485080A (en) * | 2014-09-24 | 2016-04-13 | 中联重科股份有限公司 | Rotary motor control system and control method thereof |
| CN106678090A (en) * | 2017-01-10 | 2017-05-17 | 辽宁三三工业有限公司 | Novel hydraulic rotation mechanism of segment erector |
| CN109019381A (en) * | 2018-09-14 | 2018-12-18 | 杭州流控机器制造有限公司 | A kind of negative load control loop of the hydraulic motor for elevator winch and its method |
| CN210623231U (en) * | 2019-09-30 | 2020-05-26 | 宁波中意液压马达有限公司 | Hydraulic pressure slewer buffer system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655823A (en) * | 2021-08-26 | 2021-11-16 | 攀钢集团攀枝花钢钒有限公司 | Accurate positioning parking control system for reciprocating equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104154059B (en) | Hydraulic system of telescopic device and telescopic device | |
| CN112797041A (en) | Hydraulic motor bidirectional pressure control system and method thereof | |
| CN103482517A (en) | Constant tension control device of hydraulic winch | |
| CN103671364B (en) | Electrohydraulic control system is turned to for remote control loader | |
| CN105485066A (en) | Electro-hydraulic hybrid power drive system of tunneling machine and control method | |
| CN101417765A (en) | Gig head rope synchronous continuous replacement apparatus | |
| CN106402067B (en) | A kind of 4 wheel driven travel control valve and its hydraulic open system, walking machine | |
| CN207632398U (en) | Overload protective device | |
| CN104114422B (en) | The parking brake of haulage vehicle controls device | |
| CN102674192B (en) | Mining high-speed slippage preventive winch | |
| CN201952155U (en) | Mine winch preventing from magnifying slip | |
| CN110239583A (en) | A kind of clamp rail rack locomotive parking braking system | |
| CN105302052A (en) | Electric control device system for mining elevator and control method thereof | |
| CN105220653A (en) | A kind of intelligent trash rake system and control method thereof | |
| CN108002268A (en) | Overload protective device and its method of work | |
| CN101405212B (en) | Device for moving elevator door, elevator door assembly and method for moving elevator door | |
| CN210618141U (en) | Rail clamping rack rail locomotive parking braking system | |
| CN102092611B (en) | Protection method for brake system fault of elevator and elevator system | |
| CN212479739U (en) | Closed hydraulic traveling brake valve set | |
| CN210526544U (en) | Automatic brake device of mining electric locomotive | |
| CN108501908A (en) | The anti-lock and energy regenerating brake fluid system of mining electric locomotive | |
| CN206254792U (en) | Braking valve group and vehicle | |
| CN211080376U (en) | Rotary energy-saving device of electric hydraulic excavator | |
| KR20220079448A (en) | Elevator car mover configured with auxiliary vehicle support for force release control | |
| CN107008760A (en) | Steel bar stretching cutting machine and biaxial tension cutting machine |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210514 |
|
| RJ01 | Rejection of invention patent application after publication |