CA2955713C - A multi-cylinder synchronous energy-saving and efficient hydraulic lift system and method thereof - Google Patents
A multi-cylinder synchronous energy-saving and efficient hydraulic lift system and method thereof Download PDFInfo
- Publication number
- CA2955713C CA2955713C CA2955713A CA2955713A CA2955713C CA 2955713 C CA2955713 C CA 2955713C CA 2955713 A CA2955713 A CA 2955713A CA 2955713 A CA2955713 A CA 2955713A CA 2955713 C CA2955713 C CA 2955713C
- Authority
- CA
- Canada
- Prior art keywords
- hydraulic
- oil
- valve
- circuit
- locking
- 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.)
- Expired - Fee Related
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003921 oil Substances 0.000 claims abstract description 134
- 238000011084 recovery Methods 0.000 claims abstract description 31
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 28
- 230000009471 action Effects 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 9
- 238000005381 potential energy Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
- B66B9/04—Kinds or types of lifts in, or associated with, buildings or other structures actuated pneumatically or hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
- B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
-
- 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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Elevator Control (AREA)
Abstract
Disclosed are a multi-cylinder synchronous energy-saving and efficient hydraulic lift system and a method of the system, which are applicable to lift systems such as hydraulic lifts and construction elevator platforms, etc. The system comprises an oil make-up circuit, a volumetric speed control and energy recovery circuit, a manual lifting circuit, a synchronous locking circuit, hydraulic cylinders, and an inclination sensor, wherein, the oil make-up circuit is configured to make up inadequate hydraulic oil in a closed loop system incurred by regulation with the synchronous locking circuit and system leakage, and reduce oil temperature rise; the volumetric speed control and energy recovery circuit is configured to provide power to the system, regulate the speed, and recover energy; the manual lifting circuit is configured to lift and lower the platform manually when the system has faults; the synchronous locking circuit is configured to control the plurality of hydraulic cylinders to ascend/descend synchronously and lock up the hydraulic cylinders when the platform is in a still state; the inclination sensor detects the position of the platform and feeds back the position information to a control center in real time, so as to realize closed-loop control. The system is efficient and energy-saving, and realizes energy recovery and accurate synchronization among the hydraulic cylinders, and the lifting platform is highly tolerant to unbalanced load, operates stably, and has high reliability.
Description
A Multi-Cylinder Synchronous Energy-Saving and Efficient Hydraulic Lift System and Method Thereof I. Field of the Invention The present invention relates to a lift system and a method of the lift system, in particular to a multi-cylinder synchronous energy-saving and efficient hydraulic lift system and a method of the system, which are applicable to hydraulic lifts and construction elevator platforms.
11. Background Art The drive mechanisms of lift systems mainly include traction drive and hydraulic drive. Hydraulic drive has advantages including high output, step-less speed regulation, simple system, and easy control, etc., but has lower efficiency than that of traction drive. "Green and energy-saving" is a development goal of lift systems in the future. At present, most hydraulic lift systems employ electro-hydraulic proportional control and volumetric speed control. Though such a control approach can reduce energy loss when the lift ascends, it may cause temperature rise of the hydraulic system when the lift descends, because the oil in the oil cylinder flows through a throttle valve for descending under pressure. The gravitational potential energy is not utilized when the lift descends; worse, the gravitational potential energy is transformed into heat energy, which causes oil temperature rise and has impacts on system stability.
The support mechanisms of hydraulic lifts mainly include direct jacking mechanism and indirect jacking mechanism. The direct jacking mechanism has advantages over the indirect jacking mechanism, such as simple and compact structure, and high operating efficiency. At present, the direct jacking mechanism mainly includes middle direct jacking mechanism and double-cylinder direct jacking mechanism. With these two direct jacking methods, the hydraulic cylinder may suffer higher lateral force and the parts of the lift (e.g., guide shoes) may have severe wear when the lift car is in an unbalanced load state, adverse to system operation stability.
Ill. Contents of the Invention Technical problem: To overcome the drawbacks in the prior art, the present invention provides a multi-cylinder synchronous energy-saving and efficient hydraulic lift system, which has a simple and compact structure, is energy-saving, can operate stably, and has high reliability; in addition, the present invention further provides a method of the system.
Technical scheme: The multi-cylinder synchronous energy-saving and efficient hydraulic lift system provided in the present invention comprises an oil make-up circuit, a volumetric speed control and energy recovery circuit, a manual lifting circuit, a synchronous locking circuit, a plurality of hydraulic cylinders that support under a lifting platform, and an inclination sensor mounted on the lifting platform, wherein, the oil make-up circuit is connected to the input side of the volumetric speed control and energy recovery circuit, the output side of the volumetric speed control and energy recovery circuit is connected to a pipeline at the input side of the synchronous locking circuit, the manual lifting circuit is connected to a pipeline that connects the volumetric speed control and energy recovery circuit with the synchronous locking circuit, each of the plurality of hydraulic cylinders is connected to a locking circuit that is connected with a flow distributing and collecting valve and an electro-hydraulic servo-valve, and the locking circuits, flow distributing and collecting valves, and electro-hydraulic servo-valves constitute the synchronous locking circuit for the plurality of hydraulic cylinders;
the oil make-up circuit comprises a motor and an oil make-up pump connected with the motor, wherein, an inlet of the oil make-up pump is connected via a filter to a pipeline connected to an oil tank, an outlet of the oil make-up pump is connected via a pump outlet check valve to a pipeline of the volumetric speed control and energy recovery circuit, and an overflow valve that communicates with the oil tank is arranged in the pipeline connected to an outlet of the pump outlet check valve;
the volumetric speed control and energy recovery circuit comprises an accumulator, an oil supply/return hydraulic control check valve, an oil supply/return solenoid directional valve, a safety valve, a variable-frequency and variable-speed motor, a hydraulic pump, a hydraulic motor, a power generator, and an ascend/descend solenoid directional valve, wherein, the accumulator and the oil supply/return hydraulic control check valve are connected to the pipeline connected to the outlet of the pump outlet check valve, an oil control port of the oil supply/return hydraulic control check valve is connected to an open/close port of the oil supply/return solenoid directional valve, an outlet of the oil supply/return hydraulic control check valve is connected to an inlet of an anti-cavitation check valve, an oil suction port of the hydraulic pump, and an oil outlet of the hydraulic motor, the variable-frequency and variable-speed motor is mechanically connected to an input shaft of the hydraulic pump, the power generator is mechanically connected to an output shaft of the hydraulic motor, an oil outlet of the hydraulic pump is connected to the safety valve and an inlet of the ascend/descend solenoid directional valve, and an oil inlet of the hydraulic motor is connected to an outlet of the ascend/descend solenoid directional valve;
the manual lifting circuit comprises a manual hydraulic pump connected to a pipeline connected to an inlet/outlet of the ascend/descend solenoid directional valve, and a manual descend directional valve connected to an outlet of the manual hydraulic pump;
the synchronous locking circuit comprises a flow distributing and collecting valve connected to the
11. Background Art The drive mechanisms of lift systems mainly include traction drive and hydraulic drive. Hydraulic drive has advantages including high output, step-less speed regulation, simple system, and easy control, etc., but has lower efficiency than that of traction drive. "Green and energy-saving" is a development goal of lift systems in the future. At present, most hydraulic lift systems employ electro-hydraulic proportional control and volumetric speed control. Though such a control approach can reduce energy loss when the lift ascends, it may cause temperature rise of the hydraulic system when the lift descends, because the oil in the oil cylinder flows through a throttle valve for descending under pressure. The gravitational potential energy is not utilized when the lift descends; worse, the gravitational potential energy is transformed into heat energy, which causes oil temperature rise and has impacts on system stability.
The support mechanisms of hydraulic lifts mainly include direct jacking mechanism and indirect jacking mechanism. The direct jacking mechanism has advantages over the indirect jacking mechanism, such as simple and compact structure, and high operating efficiency. At present, the direct jacking mechanism mainly includes middle direct jacking mechanism and double-cylinder direct jacking mechanism. With these two direct jacking methods, the hydraulic cylinder may suffer higher lateral force and the parts of the lift (e.g., guide shoes) may have severe wear when the lift car is in an unbalanced load state, adverse to system operation stability.
Ill. Contents of the Invention Technical problem: To overcome the drawbacks in the prior art, the present invention provides a multi-cylinder synchronous energy-saving and efficient hydraulic lift system, which has a simple and compact structure, is energy-saving, can operate stably, and has high reliability; in addition, the present invention further provides a method of the system.
Technical scheme: The multi-cylinder synchronous energy-saving and efficient hydraulic lift system provided in the present invention comprises an oil make-up circuit, a volumetric speed control and energy recovery circuit, a manual lifting circuit, a synchronous locking circuit, a plurality of hydraulic cylinders that support under a lifting platform, and an inclination sensor mounted on the lifting platform, wherein, the oil make-up circuit is connected to the input side of the volumetric speed control and energy recovery circuit, the output side of the volumetric speed control and energy recovery circuit is connected to a pipeline at the input side of the synchronous locking circuit, the manual lifting circuit is connected to a pipeline that connects the volumetric speed control and energy recovery circuit with the synchronous locking circuit, each of the plurality of hydraulic cylinders is connected to a locking circuit that is connected with a flow distributing and collecting valve and an electro-hydraulic servo-valve, and the locking circuits, flow distributing and collecting valves, and electro-hydraulic servo-valves constitute the synchronous locking circuit for the plurality of hydraulic cylinders;
the oil make-up circuit comprises a motor and an oil make-up pump connected with the motor, wherein, an inlet of the oil make-up pump is connected via a filter to a pipeline connected to an oil tank, an outlet of the oil make-up pump is connected via a pump outlet check valve to a pipeline of the volumetric speed control and energy recovery circuit, and an overflow valve that communicates with the oil tank is arranged in the pipeline connected to an outlet of the pump outlet check valve;
the volumetric speed control and energy recovery circuit comprises an accumulator, an oil supply/return hydraulic control check valve, an oil supply/return solenoid directional valve, a safety valve, a variable-frequency and variable-speed motor, a hydraulic pump, a hydraulic motor, a power generator, and an ascend/descend solenoid directional valve, wherein, the accumulator and the oil supply/return hydraulic control check valve are connected to the pipeline connected to the outlet of the pump outlet check valve, an oil control port of the oil supply/return hydraulic control check valve is connected to an open/close port of the oil supply/return solenoid directional valve, an outlet of the oil supply/return hydraulic control check valve is connected to an inlet of an anti-cavitation check valve, an oil suction port of the hydraulic pump, and an oil outlet of the hydraulic motor, the variable-frequency and variable-speed motor is mechanically connected to an input shaft of the hydraulic pump, the power generator is mechanically connected to an output shaft of the hydraulic motor, an oil outlet of the hydraulic pump is connected to the safety valve and an inlet of the ascend/descend solenoid directional valve, and an oil inlet of the hydraulic motor is connected to an outlet of the ascend/descend solenoid directional valve;
the manual lifting circuit comprises a manual hydraulic pump connected to a pipeline connected to an inlet/outlet of the ascend/descend solenoid directional valve, and a manual descend directional valve connected to an outlet of the manual hydraulic pump;
the synchronous locking circuit comprises a flow distributing and collecting valve connected to the
2 pipeline connected to the inlet/outlet of the ascend/descend solenoid directional valve, wherein, a flow distributing port of the flow distributing and collecting valve is connected to an oil inlet of the electro-hydraulic servo-valve, and a flow distributing port of the flow distributing and collecting valve is connected to an oil inlet of another electro-hydraulic servo-valve;
an inlet of the locking circuit is connected to the flow distributing port of the flow distributing and collecting valve, and an outlet of the locking circuit is connected to a rod-less cavity of the corresponding hydraulic cylinder.
The hydraulic cylinders are in quantity of two, three, four, six, eight or ten.
The locking circuit comprises a locking hydraulic control check valve, a locking solenoid directional valve connected to an oil control port of the locking hydraulic control check valve, and an unlocking manual directional valve connected in parallel with the locking hydraulic control check valve.
A multi-cylinder synchronous energy-saving and efficient hydraulic lifting method of the system described above, comprising the following steps:
1. lifting the lifting platform: switching on the power supply to the oil supply/return solenoid directional valve and opening the oil supply/return hydraulic control check valve, so that the inlet of the oil supply/return hydraulic control check valve communicates with the outlet, and the hydraulic oil in the accumulator enters into the hydraulic pump under the action of the oil pressure and generates a driving moment; meanwhile, controlling the variable-frequency and variable-speed motor to operate at variable frequency for volumetric speed regulation, so that the hydraulic pump outputs at a preset pressure and a preset flow rate, the hydraulic oil flows via the ascend/descend solenoid directional valve, flow distributing and collecting valve, and locking hydraulic control check valve into the rod-less cavities of the hydraulic cylinders, and thereby the lifting platform is driven to move upwards;
2. lowering the lifting platform: switching the power supply to the locking solenoid directional valve and opening the locking hydraulic control check valve, so that the outlet of the locking hydraulic control check valve communicates with the inlet; switching on the power supply to the ascend/descend solenoid directional valve, so that the hydraulic oil in the rod-less cavities in the hydraulic cylinders flows back under the self-weight of the lifting platform via the locking hydraulic control check valve, flow distributing and collecting valve and ascend/descend solenoid directional valve and drives the hydraulic motor to rotate, and thereby the lifting platform moves downwards; the hydraulic motor drives the power generator to rotate and generate electric power, and thereby primary energy recovery is realized;
the hydraulic oil
an inlet of the locking circuit is connected to the flow distributing port of the flow distributing and collecting valve, and an outlet of the locking circuit is connected to a rod-less cavity of the corresponding hydraulic cylinder.
The hydraulic cylinders are in quantity of two, three, four, six, eight or ten.
The locking circuit comprises a locking hydraulic control check valve, a locking solenoid directional valve connected to an oil control port of the locking hydraulic control check valve, and an unlocking manual directional valve connected in parallel with the locking hydraulic control check valve.
A multi-cylinder synchronous energy-saving and efficient hydraulic lifting method of the system described above, comprising the following steps:
1. lifting the lifting platform: switching on the power supply to the oil supply/return solenoid directional valve and opening the oil supply/return hydraulic control check valve, so that the inlet of the oil supply/return hydraulic control check valve communicates with the outlet, and the hydraulic oil in the accumulator enters into the hydraulic pump under the action of the oil pressure and generates a driving moment; meanwhile, controlling the variable-frequency and variable-speed motor to operate at variable frequency for volumetric speed regulation, so that the hydraulic pump outputs at a preset pressure and a preset flow rate, the hydraulic oil flows via the ascend/descend solenoid directional valve, flow distributing and collecting valve, and locking hydraulic control check valve into the rod-less cavities of the hydraulic cylinders, and thereby the lifting platform is driven to move upwards;
2. lowering the lifting platform: switching the power supply to the locking solenoid directional valve and opening the locking hydraulic control check valve, so that the outlet of the locking hydraulic control check valve communicates with the inlet; switching on the power supply to the ascend/descend solenoid directional valve, so that the hydraulic oil in the rod-less cavities in the hydraulic cylinders flows back under the self-weight of the lifting platform via the locking hydraulic control check valve, flow distributing and collecting valve and ascend/descend solenoid directional valve and drives the hydraulic motor to rotate, and thereby the lifting platform moves downwards; the hydraulic motor drives the power generator to rotate and generate electric power, and thereby primary energy recovery is realized;
the hydraulic oil
3 outputted from the oil outlet of the hydraulic motor is accumulated via the oil supply/return hydraulic control check valve into the accumulator, and thereby secondary energy recovery is realized;
3. synchronizing the cylinders during ascending/descending: equalizing the flow rates of the hydraulic oil flowing into the hydraulic cylinders essentially via the flow distributing and collecting valve; controlling the electro-hydraulic servo-valves to discharge the oil in an oil feeding pipeline, through which the oil is inputted into a hydraulic cylinder at a higher flow rate, to the oil tank partially, according to a real-time inclination signal fed back from the inclination sensor on the lifting platform, so as to accomplish accurate synchronization among the cylinders and thereby maintain the lifting platform in a level state in real time;
3. synchronizing the cylinders during ascending/descending: equalizing the flow rates of the hydraulic oil flowing into the hydraulic cylinders essentially via the flow distributing and collecting valve; controlling the electro-hydraulic servo-valves to discharge the oil in an oil feeding pipeline, through which the oil is inputted into a hydraulic cylinder at a higher flow rate, to the oil tank partially, according to a real-time inclination signal fed back from the inclination sensor on the lifting platform, so as to accomplish accurate synchronization among the cylinders and thereby maintain the lifting platform in a level state in real time;
4. controlling the lifting platform manually: turning the unlocking manual directional valve to a left position to unlock, so as to control the lifting platform manually, when the hydraulic lift system has power loss or a fault; specifically:
to lift up the lifting platform, the manual hydraulic pump can be operated manually to drive the hydraulic oil into the system, so that the hydraulic oil flows via the flow distributing and collecting valve and the unlocking manual directional valve into the rod-less cavities of the hydraulic cylinders, and thereby the lifting platform is driven to move upwards;
to lower the lifting platform, the manual descend directional valve can be turned to a left position manually, so that the hydraulic oil in the rod-less cavities of the hydraulic cylinders flows back via the unlocking manual directional valve, flow distributing and collecting valve, and manual descend directional valve to the oil tank, and thereby the lifting platform moves downwards;
once the lifting platform reaches to an expected position under the control, the unlocking manual directional valve and manual descend directional valve can be reset manually to a right position, so that the lifting platform is locked there.
Beneficial effects: With the above-mentioned technical scheme, the present invention has the following advantages over the prior art:
1. The system is efficient and energy-saving, and realizes energy recovery:
the hydraulic lift system employs a variable-frequency volumetric speed control circuit, which realizes energy-saving lifting operation; the hydraulic lift system employs a power generator and an accumulator to convert the gravitational potential energy of the platform during descending into electric power and hydraulic energy and store the energy for energy replenishment in the next lifting cycle, so that the hydraulic system forms a closed system, and efficient and energy-saving system operation is realized.
2. Multiple cylinders are synchronized accurately, and the lifting platform is highly tolerant to unbalanced load: the hydraulic lift system employs a flow distributing and collecting valve for rough synchronization, and then utilizes an inclination sensor mounted on the platform to detect synchronization error and utilizes inclination error feedback to control the electro-hydraulic servo-valve via a control system, so as to discharge the oil in an oil feeding pipeline, through which the oil flows into an hydraulic cylinder at a higher flow rate, to the oil tank partially via the electro-hydraulic servo-valve, and thereby ensures accurate synchronization and maintains the platform in a level state in real time when the platform ascends or descends. The system employs multiple cylinders for supporting and lifting, so as to improve the unbalanced load tolerance performance of the lifting platform.
3. The system operates highly stably and reliable: The hydraulic lift system employs a volumetric speed control and energy recovery circuit, has high efficiency, generates less heat and thereby can reduce oil temperature rise, and operates stably. The system employs a flow distributing and collecting valve for rough synchronization of the oil cylinders and employs electro-hydraulic servo-valves for accurate synchronization of the oil cylinders; hence, the lifting platform can still ascend and descend in a synchronous state even if the electro-hydraulic servo-valves fail. The system is simple in structure, highly modular, and safe and reliable.
IV. Description of the Drawings Fig. 1 is a hydraulic schematic diagram of the entire system according to the present invention;
Fig. 2 is a hydraulic schematic diagram of the oil make-up circuit in the present invention;
Fig. 3 is a hydraulic schematic diagram of the volumetric speed control and energy recovery circuit in the present invention;
Fig. 4 is a hydraulic schematic diagram of the manual lifting circuit in the present invention;
Fig. 5 is a hydraulic schematic diagram of the synchronous locking circuit that drives three hydraulic cylinders in the present invention;
Fig. 6 is a hydraulic schematic diagram of the locking circuit in the present invention;
Fig. 7 is a hydraulic schematic diagram of the synchronous locking circuit that drives two hydraulic cylinders in the present invention;
Fig. 8 is a hydraulic schematic diagram of the synchronous locking circuit that drives four hydraulic cylinders in the present invention;
Fig. 9 is a hydraulic schematic diagram of the synchronous locking circuit that drives six hydraulic cylinders in the present invention;
In the figures: 1 - oil make-up circuit; 2 - volumetric speed control and energy recovery circuit; 3 -manual lifting circuit; 4 - synchronous locking circuit; 5 - hydraulic cylinder; 6 - lifting platform;
6-1 - inclination sensor; 1-1 - filter; 1-2 - motor; 1-3 - oil make-up pump; 1-4 - pump outlet check valve; 1-5 - overflow valve; 2-1 - accumulator; 2-2 - oil supply/return hydraulic control check valve;
2-3 - oil supply/return solenoid directional valve; 2-4 - anti-cavitation check valve; 2-5 - safety valve; 2-6 - variable-frequency and variable-speed motor; 2-7 - hydraulic pump; 2-8 - hydraulic motor; 2-9 - power generator; 2-10 - ascend/descend solenoid directional valve; 3-1 - manual hydraulic pump; 3-2 - manual descend directional valve; 4-1 - flow distributing and collecting valve;
4-2 - electro-hydraulic servo-valve; 4-3 - locking circuit; 4-31 - locking solenoid directional valve;
4-32 - locking hydraulic control check valve; 4-33 - unlocking manual directional valve.
V. Detailed Description of the Embodiments Hereunder the present invention will be detailed in an embodiment with reference to the accompanying drawings.
Embodiment 1: As shown in Fig. 1, the multi-cylinder synchronous energy-saving and efficient hydraulic lift system mainly comprises an oil make-up circuit 1, a volumetric speed control and energy recovery circuit 2, a manual lifting circuit 3, a synchronous locking circuit 4, a plurality of hydraulic cylinders 5 that support under a lifting platform 6, and an inclination sensor 6-1 mounted on the lifting platform 6, wherein, the oil make-up circuit 1 is connected to the volumetric speed control and energy recovery circuit 2 through a pipeline, the volumetric speed control and energy recovery circuit 2, manual lifting circuit 3, and synchronous locking circuit 4 are connected with each other through pipelines, each hydraulic cylinder 5 is connected to a locking circuit 4-3 that is connected with a flow distributing and collecting valve 4-1 and an electro-hydraulic servo-valve 4-2 respectively, and the locking circuits 4-3, flow distributing and collecting valves 4-1, and electro-hydraulic servo-valves 4-2 constitute the synchronous locking circuit 4 for three hydraulic cylinders 5. The oil make-up circuit 1 is configured to make up inadequate hydraulic oil in a closed loop system incurred by regulation with the synchronous locking circuit 4 and system leakage, and reduce oil temperature rise in the system; the volumetric speed control and energy recovery circuit 2 is configured to provide power to the system, regulate the speed, and recover energy; the manual lifting circuit 3 is configured to lift and lower the platform manually when the system has faults; the synchronous locking circuit 4 is configured to regulate the three hydraulic cylinders 5 to ascend/descend synchronously and lock up the cylinders when the platform 6 is in a still state; the inclination sensor 6-1 is configured to detect the position of the platform and feed back the position information to a control center in real time, so as to realize closed-loop control.
As shown in Fig. 5, the synchronous locking circuit 4 that drives the three hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:2 flow split ratio, which is connected through a pipeline to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, a port A of the flow distributing and collecting valve 4-1 is connected to a port A of the electro-hydraulic servo-valve 4-2 and a locking circuit 4-3, a port B of the flow distributing and collecting valve 4-1 is connected to a port B of the electro-hydraulic servo-valve 4-2 and a port P of a flow distributing and collecting valve 11 with 1:1 flow split ratio, the flow distributing ports of the flow distributing and collecting valve 11 are connected to an electro-hydraulic servo-valve 11 and a locking circuit 11 respectively, and the locking circuit 4-3 is connected to a rod-less cavity of corresponding hydraulic cylinder 5. After twice splitting, the oil is split into three streams that flow into/out of the locking circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate; the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization. Since the splitting error can be corrected simply by discharging a small part of the flow via a servo-valve, low-capacity servo-valves can be used, and the system cost can be reduced, and the system response to synchronization regulation can be improved.
As shown in Fig. 2, the oil make-up circuit 1 comprises a filter 1-1 connected to the oil tank. The filter 1-1 is mounted to ensure the cleanness of the oil flowing into the hydraulic system and thereby ensure the reliability of system operation; an oil suction port of the oil make-up pump 1-3 is connected to the filter 1-1 through a pipeline, the motor 1-2 is mechanically connected to an input shaft of the oil make-up pump 1-3, a port A of the pump outlet check valve 1-4 is connected to an oil outlet of the oil make-up pump 1-3 through a pipeline, and the pump outlet check valve 1-4 is provided to prevent the high-pressure oil flowing into the system from flowing back and impacting the oil make-up pump 1-3; the overflow valve 1-5 is connected to a port B of the pump outlet check valve 1-4 through a pipeline, and can be adjusted to control the pressure of the oil flowing into the hydraulic system.
As shown in Fig. 3, the volumetric speed control and energy recovery circuit 2 comprises a accumulator 2-1 connected to a port B of the pump outlet check valve 1-4, and an oil supply/return hydraulic control check valve 2-2. The accumulator 2-1 is configured to store the hydraulic oil that flows back when the platform descends, and thereby realize energy recovery; an oil control port K
of the oil supply/return hydraulic control check valve 2-2 is connected to a port P of the oil supply/return solenoid directional valve 2-3, and these two valves control the oil in the hydraulic system to flow into or out of the accumulator; a port A of the oil supply/return hydraulic control check valve 2-2 is connected to a port B of an anti-cavitation check valve 2-4, an oil suction port of a hydraulic pump 2-7, and an oil outlet of a hydraulic motor 2-8, the anti-cavitation check valve 2-4 is provided to prevent cavitation in the hydraulic pump 2-7; the variable-frequency and variable-speed motor 2-6 is mechanically connected to an input shaft of the hydraulic pump 2-7, the power generator 2-9 is mechanically connected to an output shaft of the hydraulic motor 2-8, an oil outlet of the hydraulic pump 2-7 is connected to a safety valve 2-5 and a port A of the ascend/descend solenoid directional valve 2-10, and an oil inlet of the hydraulic motor 2-8 is connected to a port B of the ascend/descend solenoid directional valve 2-10, wherein, the safety valve 2-5 controls the maximum pressure of the oil flowing into the hydraulic cylinders to ensure system safety; the ascend/descend solenoid directional valve 2-10 is configured to control the operating direction of the lifting platform;
As shown in Fig. 4, the manual lifting circuit 3 comprises a manual hydraulic pump 3-1 connected to a port P of the ascend/descend solenoid directional valve 2-10 through a pipeline, and a manual descend directional valve 3-2. The manual hydraulic pump 3-1 comprises a filter, a manual pump and a check valve; the manual descend directional valve 3-2 is a two-position two-way manual directional valve.
As shown in Fig. 6, the locking circuit 4-3 comprises a locking hydraulic control check valve 4-32, a locking solenoid directional valve 4-31 connected to an oil control port K
of the locking hydraulic control check valve 4-32, and an unlocking manual directional valve 4-33 connected in parallel with the locking hydraulic control check valve 4-32, wherein, the locking hydraulic control check valve 4-32 is configured to lock the hydraulic cylinders 5 and hold the pressure when the lifting platform is in a still state; the locking solenoid directional valve 4-31 is configured to unlock the locking hydraulic control check valve 4-32 when the platform descends; the unlocking manual directional valve 4-33 is configured to unlock the locking hydraulic control check valve 4-32 before the platform is lowered manually in a case that the system has faults.
= Embodiment 2: This embodiment is essentially the same as the embodiment 1, except a difference that the synchronous locking circuit drives two hydraulic cylinders 5. As shown in Fig. 7, the synchronous locking circuit 4 that drives three hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:1 flow split ratio, which is connected to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, the flow distributing ports of the flow distributing and collecting valve 4-1 are connected with an electro-hydraulic servo-valve 4-2 and an locking circuit 4-3 respectively, and the locking circuit 4-3 is connected to the rod-less cavity of corresponding hydraulic cylinder 5; after flowing through the flow distributing and collecting valve 4-1 with 1:1 flow split ratio, the oil is split into two streams that flow into/out of the locking circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate; the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization.
Embodiment 3: This embodiment is essentially the same as the embodiment 1, except a difference that the synchronous locking circuit drives four hydraulic cylinders. As shown in Fig. 8, the synchronous locking circuit 4 that drives four hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:1 flow split ratio, which is connected to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, the flow distributing ports of the flow distributing and collecting valve 4-1 are connected with an electro-hydraulic servo-valve 4-2 and two flow distributing and collecting valves II with 1: 1 flow split ratio respectively, and the flow distributing ports of the flow distributing and collecting valve II are connected with an electro-hydraulic servo-valve II and a locking circuit 4-3 respectively. The locking circuit 4-3 is connected to the rod-less cavity of corresponding hydraulic cylinder 5. After twice splitting, the oil is split into four streams that flow into/out of the locking circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate; the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization.
Embodiment 4: This embodiment is essentially the same as the embodiment I, except a difference that the synchronous locking circuit drives six hydraulic cylinders. As shown in Fig. 9, the synchronous locking circuit 4 that drives six hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:1 flow split ratio, which is connected through a pipeline to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, the flow distributing ports of the flow distributing and collecting valve 4-1 are connected with an electro-hydraulic servo-valve 4-2 and two flow distributing and collecting valves II with 1:2 flow split ratio respectively, a port A of the flow distributing and collecting valve 11 is connected to a port A of an electro-hydraulic servo-valve 11 and a locking circuit 4-3, a port B of the flow distributing and collecting valve 11 is connected to a port B of the electro-hydraulic servo-valve II and a port P of a flow distributing and collecting valve 111 with 1:1 flow split ratio, the flow distributing ports of the flow distributing and collecting valve III are connected to an electro-hydraulic servo-valve III and a locking circuit II
respectively. The locking circuit 4-3 is connected to the rod-less cavity of corresponding hydraulic cylinder 5. After flow splitting, the oil is split into six streams that flow into/out of the locking = circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate;
the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization.
A lifting method of the multi-cylinder synchronous energy-saving and efficient hydraulic lift system provided in the present invention comprises the following steps:
I. lifting the lifting platform: when receiving a lifting command, the control system switches on the power supply to the oil supply/return solenoid directional valve 2-3 and unlocks the oil supply/return hydraulic control check valve 2-2, so that the inlet B of the oil supply/return hydraulic control check valve 2-2 communicates with the outlet A, and the hydraulic oil in the accumulator 2-1 enters into the hydraulic pump 2-7 under the action of the oil pressure and generates a driving moment; meanwhile, the control system controls the variable-frequency and variable-speed motor 2-6 to operate at variable frequency for volumetric speed regulation, so that the hydraulic pump 2-7 outputs at a preset pressure and a preset flow rate, attaining a purpose of efficient and energy-saving operation; the hydraulic oil flows via the ascend/descend solenoid directional valve 2-10, flow distributing and collecting valve 4-1, and locking hydraulic control check valve 4-32 into the rod-less cavity of the hydraulic cylinder 5, so that the lifting platform 6 is driven to move upwards;
2. lowering the lifting platform: when receiving a lowering command, the control system switches on the power supply to the locking solenoid directional valve 4-31 and unlocks the locking hydraulic control check valve 4-32, so that the outlet B of the locking hydraulic control check valve 4-32 communicates with the inlet A; and switches on the power supply to the ascend/descend solenoid directional valve 2-10, so that the hydraulic oil in the rod-less cavities in the hydraulic cylinders 5 flows back under the self-weight of the lifting platform 6 via the locking hydraulic control check valve 4-32, flow distributing and collecting valve 4-1 and ascend/descend solenoid directional valve 2-10 and drives the hydraulic motor 2-8 to rotate, and thereby the lifting platform 6 moves downwards; the hydraulic motor 2-8 drives the power generator 2-9 to rotate and generate electric power, and thereby primary energy recovery is realized; the hydraulic oil outputted from the oil outlet of the hydraulic motor 2-8 is accumulated via the oil supply/return hydraulic control check valve 2-2 into the accumulator 2-1, and thereby secondary energy recovery is realized;
3. synchronizing the cylinders during ascending/descending: the flow rates of the hydraulic oil flowing into/out each hydraulic cylinder 5 are essentially equal to each other after the hydraulic oil is distributed via the flow distributing and collecting valve 4-1; the control system controls the electro-hydraulic servo-valves 4-2 to discharge the oil in an oil feeding pipeline, through which the oil is inputted into a hydraulic cylinder 5 at a higher flow rate, to the oil tank partially, according to a real-time inclination signal fed back from the inclination sensor 6-1 on the lifting platform 6, so as to accomplish accurate synchronization among the cylinders and thereby maintain the lifting platform 6 in a level state in real time;
4. controlling the lifting platform manually: the lifting platform 6 has to be controlled manually if the hydraulic lift system has power loss or faults. first, the unlocking manual directional valve 4-33 is manually turned to a left position to unlock;
to lift up the lifting platform 6, the manual hydraulic pump 3-1 can be operated manually to drive the hydraulic oil into the system, so that the hydraulic oil flows via the flow distributing and collecting valve 4-1 and the unlocking manual directional valve 4-33 into the rod-less cavities of the hydraulic cylinders 5, and thereby the lifting platform 6 is driven to move upwards;
to lower the lifting platform 6, the manual descend directional valve 3-2 can be turned to a left position manually, so that the hydraulic oil in the rod-less cavities of the hydraulic cylinders 5 flows back via the unlocking manual directional valve 4-33, flow distributing and collecting valve 4-1, and manual descend directional valve 3-2 to the oil tank, and thereby the lifting platform 6 moves downwards;
once the lifting platform 6 reaches to an expected position under the control, the unlocking manual directional valve 4-33 and manual descend directional valve 3-2 can be reset manually to a right position, so that the lifting platform 6 is locked there.
While the present invention has been illustrated and described with reference to some embodiments, the present invention is not limited to those specific embodiments. Any equivalent structure or equivalent process variation made on the basis of the disclosure in the present invention, or any direct or indirect application of application in other relevant technical fields, shall be deemed as falling into the protection scope of the present invention.
to lift up the lifting platform, the manual hydraulic pump can be operated manually to drive the hydraulic oil into the system, so that the hydraulic oil flows via the flow distributing and collecting valve and the unlocking manual directional valve into the rod-less cavities of the hydraulic cylinders, and thereby the lifting platform is driven to move upwards;
to lower the lifting platform, the manual descend directional valve can be turned to a left position manually, so that the hydraulic oil in the rod-less cavities of the hydraulic cylinders flows back via the unlocking manual directional valve, flow distributing and collecting valve, and manual descend directional valve to the oil tank, and thereby the lifting platform moves downwards;
once the lifting platform reaches to an expected position under the control, the unlocking manual directional valve and manual descend directional valve can be reset manually to a right position, so that the lifting platform is locked there.
Beneficial effects: With the above-mentioned technical scheme, the present invention has the following advantages over the prior art:
1. The system is efficient and energy-saving, and realizes energy recovery:
the hydraulic lift system employs a variable-frequency volumetric speed control circuit, which realizes energy-saving lifting operation; the hydraulic lift system employs a power generator and an accumulator to convert the gravitational potential energy of the platform during descending into electric power and hydraulic energy and store the energy for energy replenishment in the next lifting cycle, so that the hydraulic system forms a closed system, and efficient and energy-saving system operation is realized.
2. Multiple cylinders are synchronized accurately, and the lifting platform is highly tolerant to unbalanced load: the hydraulic lift system employs a flow distributing and collecting valve for rough synchronization, and then utilizes an inclination sensor mounted on the platform to detect synchronization error and utilizes inclination error feedback to control the electro-hydraulic servo-valve via a control system, so as to discharge the oil in an oil feeding pipeline, through which the oil flows into an hydraulic cylinder at a higher flow rate, to the oil tank partially via the electro-hydraulic servo-valve, and thereby ensures accurate synchronization and maintains the platform in a level state in real time when the platform ascends or descends. The system employs multiple cylinders for supporting and lifting, so as to improve the unbalanced load tolerance performance of the lifting platform.
3. The system operates highly stably and reliable: The hydraulic lift system employs a volumetric speed control and energy recovery circuit, has high efficiency, generates less heat and thereby can reduce oil temperature rise, and operates stably. The system employs a flow distributing and collecting valve for rough synchronization of the oil cylinders and employs electro-hydraulic servo-valves for accurate synchronization of the oil cylinders; hence, the lifting platform can still ascend and descend in a synchronous state even if the electro-hydraulic servo-valves fail. The system is simple in structure, highly modular, and safe and reliable.
IV. Description of the Drawings Fig. 1 is a hydraulic schematic diagram of the entire system according to the present invention;
Fig. 2 is a hydraulic schematic diagram of the oil make-up circuit in the present invention;
Fig. 3 is a hydraulic schematic diagram of the volumetric speed control and energy recovery circuit in the present invention;
Fig. 4 is a hydraulic schematic diagram of the manual lifting circuit in the present invention;
Fig. 5 is a hydraulic schematic diagram of the synchronous locking circuit that drives three hydraulic cylinders in the present invention;
Fig. 6 is a hydraulic schematic diagram of the locking circuit in the present invention;
Fig. 7 is a hydraulic schematic diagram of the synchronous locking circuit that drives two hydraulic cylinders in the present invention;
Fig. 8 is a hydraulic schematic diagram of the synchronous locking circuit that drives four hydraulic cylinders in the present invention;
Fig. 9 is a hydraulic schematic diagram of the synchronous locking circuit that drives six hydraulic cylinders in the present invention;
In the figures: 1 - oil make-up circuit; 2 - volumetric speed control and energy recovery circuit; 3 -manual lifting circuit; 4 - synchronous locking circuit; 5 - hydraulic cylinder; 6 - lifting platform;
6-1 - inclination sensor; 1-1 - filter; 1-2 - motor; 1-3 - oil make-up pump; 1-4 - pump outlet check valve; 1-5 - overflow valve; 2-1 - accumulator; 2-2 - oil supply/return hydraulic control check valve;
2-3 - oil supply/return solenoid directional valve; 2-4 - anti-cavitation check valve; 2-5 - safety valve; 2-6 - variable-frequency and variable-speed motor; 2-7 - hydraulic pump; 2-8 - hydraulic motor; 2-9 - power generator; 2-10 - ascend/descend solenoid directional valve; 3-1 - manual hydraulic pump; 3-2 - manual descend directional valve; 4-1 - flow distributing and collecting valve;
4-2 - electro-hydraulic servo-valve; 4-3 - locking circuit; 4-31 - locking solenoid directional valve;
4-32 - locking hydraulic control check valve; 4-33 - unlocking manual directional valve.
V. Detailed Description of the Embodiments Hereunder the present invention will be detailed in an embodiment with reference to the accompanying drawings.
Embodiment 1: As shown in Fig. 1, the multi-cylinder synchronous energy-saving and efficient hydraulic lift system mainly comprises an oil make-up circuit 1, a volumetric speed control and energy recovery circuit 2, a manual lifting circuit 3, a synchronous locking circuit 4, a plurality of hydraulic cylinders 5 that support under a lifting platform 6, and an inclination sensor 6-1 mounted on the lifting platform 6, wherein, the oil make-up circuit 1 is connected to the volumetric speed control and energy recovery circuit 2 through a pipeline, the volumetric speed control and energy recovery circuit 2, manual lifting circuit 3, and synchronous locking circuit 4 are connected with each other through pipelines, each hydraulic cylinder 5 is connected to a locking circuit 4-3 that is connected with a flow distributing and collecting valve 4-1 and an electro-hydraulic servo-valve 4-2 respectively, and the locking circuits 4-3, flow distributing and collecting valves 4-1, and electro-hydraulic servo-valves 4-2 constitute the synchronous locking circuit 4 for three hydraulic cylinders 5. The oil make-up circuit 1 is configured to make up inadequate hydraulic oil in a closed loop system incurred by regulation with the synchronous locking circuit 4 and system leakage, and reduce oil temperature rise in the system; the volumetric speed control and energy recovery circuit 2 is configured to provide power to the system, regulate the speed, and recover energy; the manual lifting circuit 3 is configured to lift and lower the platform manually when the system has faults; the synchronous locking circuit 4 is configured to regulate the three hydraulic cylinders 5 to ascend/descend synchronously and lock up the cylinders when the platform 6 is in a still state; the inclination sensor 6-1 is configured to detect the position of the platform and feed back the position information to a control center in real time, so as to realize closed-loop control.
As shown in Fig. 5, the synchronous locking circuit 4 that drives the three hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:2 flow split ratio, which is connected through a pipeline to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, a port A of the flow distributing and collecting valve 4-1 is connected to a port A of the electro-hydraulic servo-valve 4-2 and a locking circuit 4-3, a port B of the flow distributing and collecting valve 4-1 is connected to a port B of the electro-hydraulic servo-valve 4-2 and a port P of a flow distributing and collecting valve 11 with 1:1 flow split ratio, the flow distributing ports of the flow distributing and collecting valve 11 are connected to an electro-hydraulic servo-valve 11 and a locking circuit 11 respectively, and the locking circuit 4-3 is connected to a rod-less cavity of corresponding hydraulic cylinder 5. After twice splitting, the oil is split into three streams that flow into/out of the locking circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate; the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization. Since the splitting error can be corrected simply by discharging a small part of the flow via a servo-valve, low-capacity servo-valves can be used, and the system cost can be reduced, and the system response to synchronization regulation can be improved.
As shown in Fig. 2, the oil make-up circuit 1 comprises a filter 1-1 connected to the oil tank. The filter 1-1 is mounted to ensure the cleanness of the oil flowing into the hydraulic system and thereby ensure the reliability of system operation; an oil suction port of the oil make-up pump 1-3 is connected to the filter 1-1 through a pipeline, the motor 1-2 is mechanically connected to an input shaft of the oil make-up pump 1-3, a port A of the pump outlet check valve 1-4 is connected to an oil outlet of the oil make-up pump 1-3 through a pipeline, and the pump outlet check valve 1-4 is provided to prevent the high-pressure oil flowing into the system from flowing back and impacting the oil make-up pump 1-3; the overflow valve 1-5 is connected to a port B of the pump outlet check valve 1-4 through a pipeline, and can be adjusted to control the pressure of the oil flowing into the hydraulic system.
As shown in Fig. 3, the volumetric speed control and energy recovery circuit 2 comprises a accumulator 2-1 connected to a port B of the pump outlet check valve 1-4, and an oil supply/return hydraulic control check valve 2-2. The accumulator 2-1 is configured to store the hydraulic oil that flows back when the platform descends, and thereby realize energy recovery; an oil control port K
of the oil supply/return hydraulic control check valve 2-2 is connected to a port P of the oil supply/return solenoid directional valve 2-3, and these two valves control the oil in the hydraulic system to flow into or out of the accumulator; a port A of the oil supply/return hydraulic control check valve 2-2 is connected to a port B of an anti-cavitation check valve 2-4, an oil suction port of a hydraulic pump 2-7, and an oil outlet of a hydraulic motor 2-8, the anti-cavitation check valve 2-4 is provided to prevent cavitation in the hydraulic pump 2-7; the variable-frequency and variable-speed motor 2-6 is mechanically connected to an input shaft of the hydraulic pump 2-7, the power generator 2-9 is mechanically connected to an output shaft of the hydraulic motor 2-8, an oil outlet of the hydraulic pump 2-7 is connected to a safety valve 2-5 and a port A of the ascend/descend solenoid directional valve 2-10, and an oil inlet of the hydraulic motor 2-8 is connected to a port B of the ascend/descend solenoid directional valve 2-10, wherein, the safety valve 2-5 controls the maximum pressure of the oil flowing into the hydraulic cylinders to ensure system safety; the ascend/descend solenoid directional valve 2-10 is configured to control the operating direction of the lifting platform;
As shown in Fig. 4, the manual lifting circuit 3 comprises a manual hydraulic pump 3-1 connected to a port P of the ascend/descend solenoid directional valve 2-10 through a pipeline, and a manual descend directional valve 3-2. The manual hydraulic pump 3-1 comprises a filter, a manual pump and a check valve; the manual descend directional valve 3-2 is a two-position two-way manual directional valve.
As shown in Fig. 6, the locking circuit 4-3 comprises a locking hydraulic control check valve 4-32, a locking solenoid directional valve 4-31 connected to an oil control port K
of the locking hydraulic control check valve 4-32, and an unlocking manual directional valve 4-33 connected in parallel with the locking hydraulic control check valve 4-32, wherein, the locking hydraulic control check valve 4-32 is configured to lock the hydraulic cylinders 5 and hold the pressure when the lifting platform is in a still state; the locking solenoid directional valve 4-31 is configured to unlock the locking hydraulic control check valve 4-32 when the platform descends; the unlocking manual directional valve 4-33 is configured to unlock the locking hydraulic control check valve 4-32 before the platform is lowered manually in a case that the system has faults.
= Embodiment 2: This embodiment is essentially the same as the embodiment 1, except a difference that the synchronous locking circuit drives two hydraulic cylinders 5. As shown in Fig. 7, the synchronous locking circuit 4 that drives three hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:1 flow split ratio, which is connected to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, the flow distributing ports of the flow distributing and collecting valve 4-1 are connected with an electro-hydraulic servo-valve 4-2 and an locking circuit 4-3 respectively, and the locking circuit 4-3 is connected to the rod-less cavity of corresponding hydraulic cylinder 5; after flowing through the flow distributing and collecting valve 4-1 with 1:1 flow split ratio, the oil is split into two streams that flow into/out of the locking circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate; the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization.
Embodiment 3: This embodiment is essentially the same as the embodiment 1, except a difference that the synchronous locking circuit drives four hydraulic cylinders. As shown in Fig. 8, the synchronous locking circuit 4 that drives four hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:1 flow split ratio, which is connected to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, the flow distributing ports of the flow distributing and collecting valve 4-1 are connected with an electro-hydraulic servo-valve 4-2 and two flow distributing and collecting valves II with 1: 1 flow split ratio respectively, and the flow distributing ports of the flow distributing and collecting valve II are connected with an electro-hydraulic servo-valve II and a locking circuit 4-3 respectively. The locking circuit 4-3 is connected to the rod-less cavity of corresponding hydraulic cylinder 5. After twice splitting, the oil is split into four streams that flow into/out of the locking circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate; the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization.
Embodiment 4: This embodiment is essentially the same as the embodiment I, except a difference that the synchronous locking circuit drives six hydraulic cylinders. As shown in Fig. 9, the synchronous locking circuit 4 that drives six hydraulic cylinders comprises a flow distributing and collecting valve 4-1 with 1:1 flow split ratio, which is connected through a pipeline to an inlet/outlet P of the ascend/descend solenoid directional valve 2-10, wherein, the flow distributing ports of the flow distributing and collecting valve 4-1 are connected with an electro-hydraulic servo-valve 4-2 and two flow distributing and collecting valves II with 1:2 flow split ratio respectively, a port A of the flow distributing and collecting valve 11 is connected to a port A of an electro-hydraulic servo-valve 11 and a locking circuit 4-3, a port B of the flow distributing and collecting valve 11 is connected to a port B of the electro-hydraulic servo-valve II and a port P of a flow distributing and collecting valve 111 with 1:1 flow split ratio, the flow distributing ports of the flow distributing and collecting valve III are connected to an electro-hydraulic servo-valve III and a locking circuit II
respectively. The locking circuit 4-3 is connected to the rod-less cavity of corresponding hydraulic cylinder 5. After flow splitting, the oil is split into six streams that flow into/out of the locking = circuit 4-3 and hydraulic cylinders 5 at essentially the same flow rate;
the electro-hydraulic servo-valves are used to further regulate the oil inflow/outflow rates of the oil cylinders and thereby realize accurate synchronization.
A lifting method of the multi-cylinder synchronous energy-saving and efficient hydraulic lift system provided in the present invention comprises the following steps:
I. lifting the lifting platform: when receiving a lifting command, the control system switches on the power supply to the oil supply/return solenoid directional valve 2-3 and unlocks the oil supply/return hydraulic control check valve 2-2, so that the inlet B of the oil supply/return hydraulic control check valve 2-2 communicates with the outlet A, and the hydraulic oil in the accumulator 2-1 enters into the hydraulic pump 2-7 under the action of the oil pressure and generates a driving moment; meanwhile, the control system controls the variable-frequency and variable-speed motor 2-6 to operate at variable frequency for volumetric speed regulation, so that the hydraulic pump 2-7 outputs at a preset pressure and a preset flow rate, attaining a purpose of efficient and energy-saving operation; the hydraulic oil flows via the ascend/descend solenoid directional valve 2-10, flow distributing and collecting valve 4-1, and locking hydraulic control check valve 4-32 into the rod-less cavity of the hydraulic cylinder 5, so that the lifting platform 6 is driven to move upwards;
2. lowering the lifting platform: when receiving a lowering command, the control system switches on the power supply to the locking solenoid directional valve 4-31 and unlocks the locking hydraulic control check valve 4-32, so that the outlet B of the locking hydraulic control check valve 4-32 communicates with the inlet A; and switches on the power supply to the ascend/descend solenoid directional valve 2-10, so that the hydraulic oil in the rod-less cavities in the hydraulic cylinders 5 flows back under the self-weight of the lifting platform 6 via the locking hydraulic control check valve 4-32, flow distributing and collecting valve 4-1 and ascend/descend solenoid directional valve 2-10 and drives the hydraulic motor 2-8 to rotate, and thereby the lifting platform 6 moves downwards; the hydraulic motor 2-8 drives the power generator 2-9 to rotate and generate electric power, and thereby primary energy recovery is realized; the hydraulic oil outputted from the oil outlet of the hydraulic motor 2-8 is accumulated via the oil supply/return hydraulic control check valve 2-2 into the accumulator 2-1, and thereby secondary energy recovery is realized;
3. synchronizing the cylinders during ascending/descending: the flow rates of the hydraulic oil flowing into/out each hydraulic cylinder 5 are essentially equal to each other after the hydraulic oil is distributed via the flow distributing and collecting valve 4-1; the control system controls the electro-hydraulic servo-valves 4-2 to discharge the oil in an oil feeding pipeline, through which the oil is inputted into a hydraulic cylinder 5 at a higher flow rate, to the oil tank partially, according to a real-time inclination signal fed back from the inclination sensor 6-1 on the lifting platform 6, so as to accomplish accurate synchronization among the cylinders and thereby maintain the lifting platform 6 in a level state in real time;
4. controlling the lifting platform manually: the lifting platform 6 has to be controlled manually if the hydraulic lift system has power loss or faults. first, the unlocking manual directional valve 4-33 is manually turned to a left position to unlock;
to lift up the lifting platform 6, the manual hydraulic pump 3-1 can be operated manually to drive the hydraulic oil into the system, so that the hydraulic oil flows via the flow distributing and collecting valve 4-1 and the unlocking manual directional valve 4-33 into the rod-less cavities of the hydraulic cylinders 5, and thereby the lifting platform 6 is driven to move upwards;
to lower the lifting platform 6, the manual descend directional valve 3-2 can be turned to a left position manually, so that the hydraulic oil in the rod-less cavities of the hydraulic cylinders 5 flows back via the unlocking manual directional valve 4-33, flow distributing and collecting valve 4-1, and manual descend directional valve 3-2 to the oil tank, and thereby the lifting platform 6 moves downwards;
once the lifting platform 6 reaches to an expected position under the control, the unlocking manual directional valve 4-33 and manual descend directional valve 3-2 can be reset manually to a right position, so that the lifting platform 6 is locked there.
While the present invention has been illustrated and described with reference to some embodiments, the present invention is not limited to those specific embodiments. Any equivalent structure or equivalent process variation made on the basis of the disclosure in the present invention, or any direct or indirect application of application in other relevant technical fields, shall be deemed as falling into the protection scope of the present invention.
Claims (4)
1. A multi-cylinder synchronous energy-saving and efficient hydraulic lift system, wherein, comprising: an oil make-up circuit (1), a volumetric speed regulation and energy recovery circuit (2), a manual lifting circuit (3), a synchronous locking circuit (4), a plurality of hydraulic cylinders (5) supported under a lifting platform (6), and an inclination sensor (6-1) mounted on the lifting platform (6); the oil make-up circuit (1) is connected to the input side of the volumetric speed regulation and energy recovery circuit (2), the output side of the volumetric speed regulation and energy recovery circuit (2) is connected to a pipeline at the input side of the synchronous locking circuit (4), the manual lifting circuit (3) is connected to a pipeline which connects the volumetric speed regulation and energy recovery circuit (2) with the synchronous locking circuit (4), each of the hydraulic cylinders (5) is connected to a locking circuit (4-3) which is connected with a flow distributing and collecting valve (4-1) and an electro-hydraulic servo-valve (4-2), and the locking circuits (4-3), flow distributing and collecting valves (4-1) and electro-hydraulic servo-valves (4-2) constitute the synchronous locking circuit (4) for the plurality of hydraulic cylinders (5);
the oil make-up circuit (1) comprises a motor (1-2) and an oil make-up pump (1-3) connected with the motor (1-2), an inlet of the oil make-up pump (1-3) is connected via a filter (1-1) to a pipeline connected to an oil tank, an outlet (A) of the oil make-up pump (1-3) is connected via a pump outlet check valve (1-4) to a pipeline of the volumetric speed regulation and energy recovery circuit (2), and an overflow valve (1-5) which communicates with the oil tank is arranged in the pipeline connected to an outlet (B) of the pump outlet check valve (1-4);
the volumetric speed regulation and energy recovery circuit (2) comprises an accumulator (2-1), an oil supply/return hydraulic control check valve (2-2), an oil supply/return solenoid directional valve (2-3), a safety valve (2-5), a variable-frequency and variable-speed motor (2-6), a hydraulic pump (2-7), a hydraulic motor (2-8), a power generator (2-9), and an ascend/descend solenoid directional valve (2-10); the accumulator (2-1) and the oil supply/return hydraulic control check valve (2-2) are connected to the pipeline connected to the outlet (B) of the pump outlet check valve (1-4), an oil control port (K) of the oil supply/return hydraulic control check valve (2-2) is connected to an open/close port (P) of the oil supply/return solenoid directional valve (2-3), an outlet (A) of the oil supply/return hydraulic control check valve (2-2) is connected to an inlet (B) of an anti-cavitation check valve (2-4), an oil suction port of the hydraulic pump (2-7), and an oil outlet of the hydraulic motor (2-8). the variable-frequency and variable-speed motor (2-6) is mechanically connected to an input shaft of the hydraulic pump (2-7), the power generator (2-9) is mechanically connected to an output shaft of the hydraulic motor (2-8), an oil outlet of the hydraulic pump (2-7) is connected to the safety valve (2-5) and an inlet (A) of the ascend/descend solenoid directional valve (2-10), and an oil inlet of the hydraulic motor (2-8) is connected to an outlet (13) of the ascend/descend solenoid directional valve (2-10);
the manual lifting circuit (3) comprises a manual hydraulic pump (3-1) connected to a pipeline of an inlet/outlet (P) of the ascend/descend solenoid directional valve (2-10), and a manual descend directional valve (3-2) connected to an outlet of the manual hydraulic pump (3-1);
the synchronous locking circuit (4) comprises a flow distributing and collecting valve (4-1) connected to the pipeline of the inlet/outlet (P) of the ascend/descend solenoid directional valve (2-10); a flow distributing port (A) of the flow distributing and collecting valve (4-1) is connected to an oil inlet (A) of the electro-hydraulic servo-valve (4-2), and a flow distributing port (B) of the flow distributing and collecting valve (4-1) is connected to an oil inlet (B) of an electro-hydraulic servo-valve (4-3); an inlet of the locking circuit (4-3) is connected to the flow distributing port of the flow distributing and collecting valve (4-1), and an outlet of the locking circuit (4-3) is connected to a rod-less cavity of the corresponding hydraulic cylinder (5).
the oil make-up circuit (1) comprises a motor (1-2) and an oil make-up pump (1-3) connected with the motor (1-2), an inlet of the oil make-up pump (1-3) is connected via a filter (1-1) to a pipeline connected to an oil tank, an outlet (A) of the oil make-up pump (1-3) is connected via a pump outlet check valve (1-4) to a pipeline of the volumetric speed regulation and energy recovery circuit (2), and an overflow valve (1-5) which communicates with the oil tank is arranged in the pipeline connected to an outlet (B) of the pump outlet check valve (1-4);
the volumetric speed regulation and energy recovery circuit (2) comprises an accumulator (2-1), an oil supply/return hydraulic control check valve (2-2), an oil supply/return solenoid directional valve (2-3), a safety valve (2-5), a variable-frequency and variable-speed motor (2-6), a hydraulic pump (2-7), a hydraulic motor (2-8), a power generator (2-9), and an ascend/descend solenoid directional valve (2-10); the accumulator (2-1) and the oil supply/return hydraulic control check valve (2-2) are connected to the pipeline connected to the outlet (B) of the pump outlet check valve (1-4), an oil control port (K) of the oil supply/return hydraulic control check valve (2-2) is connected to an open/close port (P) of the oil supply/return solenoid directional valve (2-3), an outlet (A) of the oil supply/return hydraulic control check valve (2-2) is connected to an inlet (B) of an anti-cavitation check valve (2-4), an oil suction port of the hydraulic pump (2-7), and an oil outlet of the hydraulic motor (2-8). the variable-frequency and variable-speed motor (2-6) is mechanically connected to an input shaft of the hydraulic pump (2-7), the power generator (2-9) is mechanically connected to an output shaft of the hydraulic motor (2-8), an oil outlet of the hydraulic pump (2-7) is connected to the safety valve (2-5) and an inlet (A) of the ascend/descend solenoid directional valve (2-10), and an oil inlet of the hydraulic motor (2-8) is connected to an outlet (13) of the ascend/descend solenoid directional valve (2-10);
the manual lifting circuit (3) comprises a manual hydraulic pump (3-1) connected to a pipeline of an inlet/outlet (P) of the ascend/descend solenoid directional valve (2-10), and a manual descend directional valve (3-2) connected to an outlet of the manual hydraulic pump (3-1);
the synchronous locking circuit (4) comprises a flow distributing and collecting valve (4-1) connected to the pipeline of the inlet/outlet (P) of the ascend/descend solenoid directional valve (2-10); a flow distributing port (A) of the flow distributing and collecting valve (4-1) is connected to an oil inlet (A) of the electro-hydraulic servo-valve (4-2), and a flow distributing port (B) of the flow distributing and collecting valve (4-1) is connected to an oil inlet (B) of an electro-hydraulic servo-valve (4-3); an inlet of the locking circuit (4-3) is connected to the flow distributing port of the flow distributing and collecting valve (4-1), and an outlet of the locking circuit (4-3) is connected to a rod-less cavity of the corresponding hydraulic cylinder (5).
2. The multi-cylinder synchronous energy-saving and efficient hydraulic lift system according to claim I , wherein, the hydraulic cylinders (5) are in quantity of two. three, four, six, eight or ten.
3. The multi-cylinder synchronous energy-saving and efficient hydraulic lift system according to claim 1, wherein, the locking circuit (4-3) comprises a locking hydraulic control check valve (4-32), a locking solenoid directional valve (4-31) connected to an oil control port (K) of the locking hydraulic control check valve (4-32), and an unlocking manual directional valve (4-33) connected in parallel with the locking hydraulic control check valve (4-32).
4. A multi-cylinder synchronous energy-saving and efficient hydraulic lifting method of the system according to any of claims 1 to 3, wherein, comprising the following steps:
(1) lifting the lifting platform: switching on the power supply to the oil supply/return solenoid directional valve (2-3) and opening the oil supply/return hydraulic control check valve (2-2), so that the inlet (B) and the outlet (A) of the oil supply/return hydraulic control check valve (2-2) are connected, and the hydraulic oil in the accumulator (2-1) enters into the hydraulic pump (2-7) under the action of the oil pressure and generates a driving moment;
meanwhile, controlling the variable-frequency and variable-speed motor (2-6) to operate at variable frequency for volumetric speed regulation, so that the hydraulic pump (2-7) outputs at a preset pressure and a preset flow rate, the hydraulic oil flows through the ascend/descend solenoid directional valve (2-10), flow distributing and collecting valve (4-1), and locking hydraulic control check valve (4-32) into the rod-less cavities of the hydraulic cylinders (5), and thereby the lifting platform (6) is driven to move upwards;
(2) lowering the lifting platform: switching the power supply to the locking solenoid directional valve (4-31) and opening the locking hydraulic control check valve (4-32), so that the outlet (B) and the inlet (A) of the locking hydraulic control check valve (4-32) are connected; switching on the power supply to the ascend/descend solenoid directional valve (2-10), so that the hydraulic oil in the rod-less cavities in the hydraulic cylinders (5) flows back under the self-weight of the lifting platform (6) via the locking hydraulic control check valve (4-32), flow distributing and collecting valve (4-1) and ascend/descend solenoid directional valve (2-10) and drives the hydraulic motor (2-8) to rotate, and thereby the lifting platform (6) moves downwards; the hydraulic motor (2-8) drives the power generator (2-9) to rotate and generate electric power, and thereby primary energy recovery is realized; the hydraulic oil outputted from the oil outlet of the hydraulic motor (2-8) is accumulated via the oil supply/return hydraulic control check valve (2-2) into the accumulator (2-1), and thereby secondary energy recovery is realized;
(3)synchronizing the cylinders during ascending/descending: equalizing the flow rates of the hydraulic oil flowing into the hydraulic cylinders (5) via the flow distributing and collecting valve (4-1); controlling the electro-hydraulic servo-valves (4-2) to discharge the oil in an oil feeding pipeline, through which the oil is inputted into a hydraulic cylinder (5) at a higher flow rate, to the oil tank partially, according to a real-time inclination signal fed back from the inclination sensor (6-1) on the lifting platform (6), so as to accomplish accurate synchronization among the cylinders and thereby maintain the lifting platform (6) in a level state in real time;
(4)controlling the lifting platform manually: controling the lifting platform (6) manually, and turning the unlocking manual directional valve (4-33) to a left position to unlock, when the hydraulic lift system has power loss or a fault; to lift up the lifting platform (6), the manual hydraulic pump (3-1) can be operated manually to drive the hydraulic oil into the system, so that the hydraulic oil flows through the flow distributing and collecting valve (4-1) and the unlocking manual directional valve (4-33) into the rod-less cavities of the hydraulic cylinders (5), and thereby the lifting platform (6) is driven to move upwards;
to lower the lifting platform (6), the manual descend directional valve (3-2) can be turned to a left position manually, so that the hydraulic oil in the rod-less cavities of the hydraulic cylinders .
(5) flows back via the unlocking manual directional valve (4-33), flow distributing and collecting valve (4-1), and manual descend directional valve (3-2) to the oil tank, and thereby the lifting platform (6) moves downwards;
once the lifting platform (6) reaches to an expected position under the control, the unlocking manual directional valve (4-33) and manual descend directional valve (3-2) can be reset manually to a right position, so that the lifting platform (6) is locked there.
(1) lifting the lifting platform: switching on the power supply to the oil supply/return solenoid directional valve (2-3) and opening the oil supply/return hydraulic control check valve (2-2), so that the inlet (B) and the outlet (A) of the oil supply/return hydraulic control check valve (2-2) are connected, and the hydraulic oil in the accumulator (2-1) enters into the hydraulic pump (2-7) under the action of the oil pressure and generates a driving moment;
meanwhile, controlling the variable-frequency and variable-speed motor (2-6) to operate at variable frequency for volumetric speed regulation, so that the hydraulic pump (2-7) outputs at a preset pressure and a preset flow rate, the hydraulic oil flows through the ascend/descend solenoid directional valve (2-10), flow distributing and collecting valve (4-1), and locking hydraulic control check valve (4-32) into the rod-less cavities of the hydraulic cylinders (5), and thereby the lifting platform (6) is driven to move upwards;
(2) lowering the lifting platform: switching the power supply to the locking solenoid directional valve (4-31) and opening the locking hydraulic control check valve (4-32), so that the outlet (B) and the inlet (A) of the locking hydraulic control check valve (4-32) are connected; switching on the power supply to the ascend/descend solenoid directional valve (2-10), so that the hydraulic oil in the rod-less cavities in the hydraulic cylinders (5) flows back under the self-weight of the lifting platform (6) via the locking hydraulic control check valve (4-32), flow distributing and collecting valve (4-1) and ascend/descend solenoid directional valve (2-10) and drives the hydraulic motor (2-8) to rotate, and thereby the lifting platform (6) moves downwards; the hydraulic motor (2-8) drives the power generator (2-9) to rotate and generate electric power, and thereby primary energy recovery is realized; the hydraulic oil outputted from the oil outlet of the hydraulic motor (2-8) is accumulated via the oil supply/return hydraulic control check valve (2-2) into the accumulator (2-1), and thereby secondary energy recovery is realized;
(3)synchronizing the cylinders during ascending/descending: equalizing the flow rates of the hydraulic oil flowing into the hydraulic cylinders (5) via the flow distributing and collecting valve (4-1); controlling the electro-hydraulic servo-valves (4-2) to discharge the oil in an oil feeding pipeline, through which the oil is inputted into a hydraulic cylinder (5) at a higher flow rate, to the oil tank partially, according to a real-time inclination signal fed back from the inclination sensor (6-1) on the lifting platform (6), so as to accomplish accurate synchronization among the cylinders and thereby maintain the lifting platform (6) in a level state in real time;
(4)controlling the lifting platform manually: controling the lifting platform (6) manually, and turning the unlocking manual directional valve (4-33) to a left position to unlock, when the hydraulic lift system has power loss or a fault; to lift up the lifting platform (6), the manual hydraulic pump (3-1) can be operated manually to drive the hydraulic oil into the system, so that the hydraulic oil flows through the flow distributing and collecting valve (4-1) and the unlocking manual directional valve (4-33) into the rod-less cavities of the hydraulic cylinders (5), and thereby the lifting platform (6) is driven to move upwards;
to lower the lifting platform (6), the manual descend directional valve (3-2) can be turned to a left position manually, so that the hydraulic oil in the rod-less cavities of the hydraulic cylinders .
(5) flows back via the unlocking manual directional valve (4-33), flow distributing and collecting valve (4-1), and manual descend directional valve (3-2) to the oil tank, and thereby the lifting platform (6) moves downwards;
once the lifting platform (6) reaches to an expected position under the control, the unlocking manual directional valve (4-33) and manual descend directional valve (3-2) can be reset manually to a right position, so that the lifting platform (6) is locked there.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706232.3A CN105179343B (en) | 2015-10-27 | 2015-10-27 | Multi-cylinder synchronous energy-saving efficient hydraulic lifting system and method |
| CN201510706232.3 | 2015-10-27 | ||
| PCT/CN2015/098171 WO2017071027A1 (en) | 2015-10-27 | 2015-12-22 | Multi-cylinder synchronized, power-saving, high-efficiency hydraulic lifting/lowering system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2955713A1 CA2955713A1 (en) | 2017-04-27 |
| CA2955713C true CA2955713C (en) | 2019-05-14 |
Family
ID=54901673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2955713A Expired - Fee Related CA2955713C (en) | 2015-10-27 | 2015-12-22 | A multi-cylinder synchronous energy-saving and efficient hydraulic lift system and method thereof |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN105179343B (en) |
| CA (1) | CA2955713C (en) |
| RU (1) | RU2657525C1 (en) |
| WO (1) | WO2017071027A1 (en) |
Families Citing this family (76)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105384125B (en) * | 2015-12-25 | 2017-10-10 | 安徽唐兴机械装备有限公司 | A kind of climbing device hydraulic system and its method for arranging |
| CN105545831B (en) * | 2016-03-19 | 2017-05-31 | 青岛大学 | A kind of double dragline structure energy-conservation coordinated control systems of sack filling machine |
| CN106151127B (en) * | 2016-08-10 | 2018-09-11 | 武汉钢铁有限公司 | The double oil cylinder synchronous lift control methods of deburring machine and device |
| CN106144855B (en) * | 2016-08-19 | 2018-10-23 | 湖南电气职业技术学院 | The method and apparatus that a kind of tractive driving apparatus of load balance and energy regenerating utilize |
| CN107161909B (en) * | 2017-07-04 | 2023-04-07 | 上海振华重工(集团)股份有限公司 | Hydraulic lifting system with interlocking protection |
| CN107191421B (en) * | 2017-07-05 | 2018-10-30 | 江苏常发农业装备股份有限公司 | A kind of lifter control device |
| CN107745020B (en) * | 2017-11-16 | 2023-08-01 | 安徽德系重工科技有限公司 | Hydraulic system of four-roller corrugated plate bending machine |
| CN107816464B (en) * | 2017-11-29 | 2023-10-20 | 农业部南京农业机械化研究所 | Hydraulic driving system of pneumatic type paddy planter |
| CN107806454A (en) * | 2017-12-06 | 2018-03-16 | 内蒙动力机械研究所 | A kind of composite impregnating autoclave load lifting cylinder hydraulic synchronization adjusting means |
| CN107893784B (en) * | 2017-12-13 | 2023-12-05 | 安徽天水液压机床科技有限公司 | Hydraulic system of multi-cylinder linkage hydraulic machine |
| CN108184353B (en) * | 2018-01-12 | 2023-07-28 | 农业部南京农业机械化研究所 | General chassis of hydrostatic drive's paddy field working device |
| CN108223467B (en) * | 2018-01-15 | 2023-05-30 | 河北工程大学 | Hydraulic system for full-hydraulic crawler-type reverse circulation engineering driller |
| CN108286540B (en) * | 2018-03-09 | 2024-07-09 | 上海外高桥造船有限公司 | Hydraulic system of marine multifunctional hydraulic working platform |
| CN108194435B (en) * | 2018-03-29 | 2023-09-12 | 大连华锐重工集团股份有限公司 | Bolt type marine lifting platform synchronous hydraulic system and control method thereof |
| CN108687283B (en) * | 2018-03-30 | 2024-04-12 | 天津市天锻压力机有限公司 | Electrohydraulic control system of hot extrusion forming hydraulic machine and process forming method |
| CN108317117B (en) * | 2018-04-02 | 2024-01-05 | 中国船舶重工集团公司第七一九研究所 | Double-margin servo control valve group with low throttle noise |
| CN108343757B (en) * | 2018-04-03 | 2023-09-12 | 浙江精嘉阀门有限公司 | Hydraulic control by-pass linkage ball valve |
| CN108502816B (en) * | 2018-05-08 | 2023-07-14 | 安徽合力股份有限公司 | Bypass type energy regeneration forklift hydraulic system |
| CN108571028A (en) * | 2018-06-14 | 2018-09-25 | 长安大学 | A kind of hydraulic crawler excavator rotation energy recovery system and method |
| CN108533578A (en) * | 2018-06-14 | 2018-09-14 | 长安大学 | A kind of hydraulic movable arm potential energy recovery system and method |
| CN108635921B (en) * | 2018-07-18 | 2024-03-19 | 上海同臣环保有限公司 | Ultra-high pressure elastic squeezer with balanced squeezing force and constant sealing force of filter plate frame |
| CN108843630B (en) * | 2018-07-23 | 2024-02-02 | 中国重型机械研究院股份公司 | Position and pressure continuously adjustable driving roller depressing hydraulic control system |
| CN108672667A (en) * | 2018-07-24 | 2018-10-19 | 中国重型机械研究院股份公司 | Low-power consumption hydraulic position holding system and control method with on-line proving function |
| CN108757624B (en) * | 2018-08-01 | 2023-11-28 | 本钢板材股份有限公司 | Differential speed-increasing circuit of oil cylinder overflow valve |
| CN109249848B (en) * | 2018-09-05 | 2024-02-27 | 上海中荷环保有限公司 | Transport vehicle hydraulic system and transport vehicle |
| CN109114055B (en) * | 2018-09-25 | 2020-06-16 | 北京工业大学 | Hydraulic combined supporting system for machining marine propeller blades |
| CN109185243A (en) * | 2018-10-10 | 2019-01-11 | 山西万锐液压机械有限公司 | A kind of bias hydraulic system |
| CN109334759B (en) * | 2018-11-02 | 2024-04-05 | 山东蓬翔汽车有限公司 | Hydraulic system of wide dump truck |
| CN109268325B (en) * | 2018-11-20 | 2023-09-26 | 燕山大学 | Electro-hydraulic driving unit for exceeding load and capable of precisely ensuring position control |
| CN109322882A (en) * | 2018-12-04 | 2019-02-12 | 大连华锐重工集团股份有限公司 | A kind of hydraulic power unit and its control method of bolt-type ocean lifting platform |
| CN109437031B (en) * | 2018-12-07 | 2023-08-18 | 沈阳建筑大学 | Hydraulic system for recovering and recycling rotary braking energy of tower crane |
| CN109458384B (en) * | 2018-12-11 | 2024-01-23 | 山东交通学院 | Tandem connection double-piston-rod symmetrical hydraulic cylinder propulsion system of shield tunneling machine |
| CN109538559A (en) * | 2018-12-11 | 2019-03-29 | 山东交通学院 | The shield excavation machine propulsion system that the symmetrical hydraulic cylinder of single-piston rod is connected in series |
| CN109443823A (en) * | 2018-12-25 | 2019-03-08 | 上海电气液压气动有限公司 | A kind of depth tunnel domain experimental rig |
| CN109488257B (en) * | 2018-12-26 | 2024-01-05 | 沈阳人和机电工程设备有限公司 | Pressure complementary hydraulic pumping unit |
| CN109454637A (en) * | 2018-12-28 | 2019-03-12 | 哈尔滨理工大学 | A kind of hydraulic quadruped robot becomes the joint energy conserving system of charge oil pressure |
| CN109513146B (en) * | 2018-12-29 | 2024-03-01 | 江苏徐工工程机械研究院有限公司 | Material conveying device and sand throwing fire extinguishing vehicle |
| CN109611385B (en) * | 2019-01-03 | 2023-11-24 | 德阳元亨机械制造有限公司 | Pressure-stabilizing type aircraft skin clamping system and method |
| CN109707673A (en) * | 2019-02-26 | 2019-05-03 | 江苏力源液压机械有限公司 | A kind of manual/auto integrated two-way rotary shaft hydraulic braking system |
| CN109916753B (en) * | 2019-04-17 | 2024-04-30 | 中国船舶集团有限公司第七〇四研究所 | Electro-hydraulic servo loading and fatigue test device and method for long oil pipeline of controllable pitch propeller |
| CN109989955A (en) * | 2019-04-30 | 2019-07-09 | 广东联城住工装备信息科技有限公司 | The hydraulic system of edge-on machine, edge-on machine and its control method |
| CN110115139B (en) * | 2019-05-08 | 2023-11-14 | 广西大学 | Hydraulic system for double-row sugarcane transverse planter and control method |
| CN110328782A (en) * | 2019-07-29 | 2019-10-15 | 杭州方圆塑机股份有限公司 | Foamed plastics automatic moulding machine quick exchange die bed self-adapting locking mechanism |
| CN110359745B (en) * | 2019-08-09 | 2024-04-12 | 桂林航天工业学院 | Hydraulically-driven double-layer garage lifting device and method |
| CN110500330B (en) * | 2019-08-30 | 2020-06-05 | 中国矿业大学 | Anti-unbalance-load adjustable-speed synchronous valve, synchronous control system and working method |
| CN110510540B (en) * | 2019-09-19 | 2024-02-13 | 成都立航科技股份有限公司 | Aircraft jacking hydraulic system |
| CN110630575A (en) * | 2019-09-27 | 2019-12-31 | 安徽爱瑞特新能源专用汽车股份有限公司 | Discharging device hydraulic system for pure electric sanitation truck |
| CN110758094B (en) * | 2019-10-30 | 2024-04-26 | 南通威而多专用汽车制造有限公司 | Hydraulic system for engineering machinery walking and working method thereof |
| CN111421871B (en) * | 2020-05-21 | 2024-06-07 | 南通锻压设备如皋有限公司 | Closed electrohydraulic control system of hydraulic motor driving press |
| CN111822093B (en) * | 2020-08-12 | 2024-07-02 | 中山笛麦珂环保科技有限公司 | Occlusion roller with adaptive occlusion distance |
| CN112196848B (en) * | 2020-10-23 | 2023-08-11 | 中铁工程装备集团有限公司 | Hydraulic control system of main driving torsion preventing device of shield tunneling machine |
| CN112249985B (en) * | 2020-11-10 | 2024-07-02 | 厦门国重新能工程机械有限公司 | Potential energy recycling system of combined electric forklift |
| CN114506690A (en) * | 2020-11-16 | 2022-05-17 | 南京宝地梅山产城发展有限公司 | Device for automatically adjusting gravity center position of material machine and control method thereof |
| CN113048104B (en) * | 2021-04-22 | 2022-07-15 | 贵州大学 | Energy recovery system of hydraulic load operation platform |
| CN113357225B (en) * | 2021-04-29 | 2024-01-19 | 河南科技大学 | Hydraulic control system of hydraulic cylinder loading test bed |
| CN113250728B (en) * | 2021-05-08 | 2024-06-07 | 中煤科工开采研究院有限公司 | Hydraulic support pressurizing and flow increasing liquid supply system |
| CN113353843B (en) * | 2021-05-28 | 2022-08-19 | 中车长江运输设备集团有限公司 | Hydraulic lifting device, hydraulic lifting system with same and lifting cargo carrying platform |
| CN113864260B (en) * | 2021-08-24 | 2024-02-02 | 宣化钢铁集团有限责任公司 | Hydraulic control device of lifting oil cylinder of stepping heating furnace |
| CN113819096B (en) * | 2021-09-08 | 2024-04-02 | 西安重装澄合煤矿机械有限公司 | Intelligent hydraulic system for self-moving tail and control method |
| CN113803310B (en) * | 2021-09-10 | 2023-07-21 | 武汉船用机械有限责任公司 | Synchronous control system and control method for double hydraulic cylinders |
| CN113915177B (en) * | 2021-09-16 | 2024-05-14 | 利穗科技(苏州)有限公司 | Electrohydraulic servo driving device and chromatographic equipment |
| CN113955653A (en) * | 2021-10-11 | 2022-01-21 | 中联重科建筑机械(江苏)有限责任公司 | Self-climbing tower crane and multi-cylinder jacking system thereof |
| CN114223498B (en) * | 2021-11-08 | 2023-06-06 | 徐州徐工挖掘机械有限公司 | Clamping and conveying hydraulic system |
| CN114436164B (en) * | 2021-11-24 | 2023-09-08 | 广西电网有限责任公司北海供电局 | Electric repair tower lifting leveling device and method |
| CN114087245B (en) * | 2021-11-30 | 2023-06-20 | 福建南方路面机械股份有限公司 | Hydraulic control system of cone crusher and control method thereof |
| CN114109943B (en) * | 2021-12-08 | 2023-05-26 | 中冶南方工程技术有限公司 | Converter two-venturi throat hydraulic servo system |
| CN114233700B (en) * | 2021-12-22 | 2023-12-26 | 合肥合锻智能制造股份有限公司 | Hydraulic control system |
| CN114427551B (en) * | 2022-03-14 | 2023-06-30 | 合肥工业大学 | Energy accumulator-based energy recovery system of hydraulic system of anchor winch |
| CN114955918B (en) * | 2022-05-24 | 2023-06-16 | 江南造船(集团)有限责任公司 | Multistage hydraulic jacking system |
| CN114876889B (en) * | 2022-06-21 | 2024-06-14 | 徐州徐工农业装备科技有限公司 | Tool lifting stable control method, system and tractor |
| CN115405573B (en) * | 2022-08-16 | 2024-07-16 | 浙江大学高端装备研究院 | Multifunctional teaching experiment platform for electrohydraulic servo proportional system |
| CN115434981A (en) * | 2022-08-29 | 2022-12-06 | 中煤科工能源科技发展有限公司 | Simulation frame moving device |
| CN115388060B (en) * | 2022-09-30 | 2024-05-10 | 西安兰石重工机械有限公司 | Full-hydraulic clamping control integrated valve group for iron driller and control method |
| CN115467750B (en) * | 2022-10-14 | 2024-03-26 | 中船动力研究院有限公司 | Speed regulating system and speed regulating method for diesel engine |
| CN116221207B (en) * | 2023-03-30 | 2024-02-06 | 华东交通大学 | Discrete four-cavity hydraulic cylinder system controlled by multiple electromagnetic valves |
| CN117645254B (en) * | 2024-01-30 | 2024-04-26 | 杭叉集团股份有限公司 | Forklift forward energy recovery hydraulic control system and control method thereof |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3754394A (en) * | 1971-12-02 | 1973-08-28 | Hyster Co | Hydraulic control system for electric lift truck |
| SU1312068A1 (en) * | 1985-09-04 | 1987-05-23 | Предприятие П/Я А-1944 | Hydraulic hoist |
| RU2115030C1 (en) * | 1996-07-17 | 1998-07-10 | Конструкторское бюро специального машиностроения | Load platform jacking-up and levelling hydraulic drive |
| JPH11108181A (en) * | 1997-09-30 | 1999-04-20 | Sumitomo Eaton Hydraulics Co Ltd | Drive control system for vehicle having hydraulic motor for running and fluid control device with flow dividing function |
| US6000315A (en) * | 1998-05-04 | 1999-12-14 | Deere & Company | Lift control for implement frame |
| US6189432B1 (en) * | 1999-03-12 | 2001-02-20 | Hunter Engineering Company | Automotive lift hydraulic fluid control circuit |
| RU94220U1 (en) * | 2009-12-21 | 2010-05-20 | Государственное образовательное учреждение высшего профессионального образования "Сибирская государственная автомобильно-дорожная академия (СибАДИ)" | DEVICE FOR AUTOMATIC LEVELING OF THE SUPPORT PLATFORM IN THE HORIZONTAL PLANE |
| CN201882875U (en) * | 2010-10-25 | 2011-06-29 | 北京市三一重机有限公司 | Hydraulic drive system of manned lifting table |
| CN202100559U (en) * | 2011-05-21 | 2012-01-04 | 山河智能装备股份有限公司 | Potential energy recovering hydraulic system |
| CN103732835B (en) * | 2011-08-12 | 2017-09-12 | 伊顿公司 | System and method for recovering energy and balancing hydraulic system load |
| CN203796641U (en) * | 2014-02-19 | 2014-08-27 | 华中科技大学 | Stepless speed regulating hydraulic system of hydraulic machine |
| CN104925694A (en) * | 2015-07-08 | 2015-09-23 | 安徽合力股份有限公司 | Hydraulic lifting platform system capable of achieving synchronous oil cylinder lifting |
| CN205136183U (en) * | 2015-10-27 | 2016-04-06 | 中国矿业大学 | Energy -conserving high -efficient hydraulic lifting system of multi -cylinder synchronization |
-
2015
- 2015-10-27 CN CN201510706232.3A patent/CN105179343B/en not_active Expired - Fee Related
- 2015-12-22 WO PCT/CN2015/098171 patent/WO2017071027A1/en active Application Filing
- 2015-12-22 CA CA2955713A patent/CA2955713C/en not_active Expired - Fee Related
- 2015-12-22 RU RU2017106309A patent/RU2657525C1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN105179343B (en) | 2017-03-22 |
| WO2017071027A1 (en) | 2017-05-04 |
| RU2657525C1 (en) | 2018-06-14 |
| CN105179343A (en) | 2015-12-23 |
| CA2955713A1 (en) | 2017-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2955713C (en) | A multi-cylinder synchronous energy-saving and efficient hydraulic lift system and method thereof | |
| CN100482953C (en) | Giant-scale hydraulic press synchronous balancing hydraulic circuit | |
| CN103939405B (en) | A kind of fast automatic leveling hydraulic control circuit of down-the-hole drill and controlling method thereof | |
| CN102173363A (en) | Jacking structure of tower crane and hydraulic system and jacking method thereof | |
| CN110219836B (en) | Safety switching braking constant-speed-reduction hydraulic system and braking method for elevator | |
| CN102650304A (en) | Hydraulic synchronous driving system for adjusting unbalanced load based on proportional valve controlled energy accumulator | |
| CN106704313B (en) | Rotary drilling rig and mast hydraulic control system and mast raising/decline control method | |
| CN104632794A (en) | Electro-hydraulic servo system of direct drive type hydraulic hoist | |
| CN202579384U (en) | Hydraulic synchronous driving system for adjusting eccentric loads based on proportional valve -controlled energy accumulators | |
| CN104925694A (en) | Hydraulic lifting platform system capable of achieving synchronous oil cylinder lifting | |
| CN104632736A (en) | Two-degree-of-freedom rocking platform and hydraulic system thereof | |
| CN102295248A (en) | Hydraulic elevating leveling device and control and use method for the same | |
| CN205136183U (en) | Energy -conserving high -efficient hydraulic lifting system of multi -cylinder synchronization | |
| CN210565392U (en) | Safety conversion braking constant speed reduction hydraulic system of elevator | |
| CN203809389U (en) | Hydraulic control loop for quick and automatic leveling of down-the-hole drill | |
| CN107130794A (en) | Ultrahigh-rise building top mold adopting modular design and rapid assembly and jacking method | |
| CN202016806U (en) | Jacking structure of tower type crane and hydraulic system thereof | |
| CN205190393U (en) | Hydraulic drive device of super large jumbo | |
| CN102155007B (en) | Hydraulic system for trolley driving mechanism of inclined sliding door hoist | |
| CN108468672B (en) | Energy-saving hydraulic system of stepping heating furnace | |
| CN114352591B (en) | Method for hydraulically and synchronously driving weights | |
| CN109114075B (en) | A kind of stereo garage electro-hydraulic proportional control system | |
| CN203373114U (en) | Tube explosion resistant oil hydraulic circuit of vertical lifting mechanism | |
| CN205349892U (en) | Electrical system of drive super large jumbo | |
| RU2459123C1 (en) | Hydraulic drive of cargo platform weighing and levelling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |
Effective date: 20201222 |