CN112228418A - Hydraulic synchronization system based on volume control and control method - Google Patents
Hydraulic synchronization system based on volume control and control method Download PDFInfo
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- CN112228418A CN112228418A CN202011347405.4A CN202011347405A CN112228418A CN 112228418 A CN112228418 A CN 112228418A CN 202011347405 A CN202011347405 A CN 202011347405A CN 112228418 A CN112228418 A CN 112228418A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/002—Calibrating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0427—Heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a hydraulic synchronization system and a control method based on volume control, which are mainly used for synchronization control in hydraulic transmission. An active adjustment deviation rectifying loop is designed in the system, and when deviation occurs in the operation process, the deviation can be actively adjusted and rectified according to a position signal fed back by an execution oil cylinder displacement sensor, so that the normal operation of the synchronous system is ensured. The hydraulic synchronous system mainly realizes active oil supplement and passive oil supplement, real-time adjustment, ideal synchronous effect, low cost and simple and convenient use and maintenance; meanwhile, the invention is easy to realize and suitable for popularization and application due to reasonable and simple structural design.
Description
Technical Field
The invention relates to the technical field of hydraulic drive, in particular to a hydraulic synchronous system based on volume control.
Background
Along with the rapid development of national economy, various machines are widely applied, in the process of mechanical driving, a hydraulic system plays a key role, a hydraulic synchronous control system is an important technical key in the hydraulic system, and the accuracy effect of hydraulic synchronization sometimes determines the quality of engineering. The hydraulic synchronous system is controlled by adopting a mode of installing a pipe type throttle valve at an inlet end and an outlet end, adopting a mode of connecting oil cylinders in series, adopting a mode of a synchronous valve and adopting a mode of a synchronous motor, but the control modes have low synchronous precision, particularly under the condition of unbalanced load, real-time adjustment cannot be realized, the synchronous effect is very poor, and the synchronous precision is about 5-10 percent; the mode that adopts servo valve closed loop control is effectual, but the cost is high, and the use requires highly to fluid cleanliness, and the later maintenance is complicated, and use cost is high.
Therefore, the above problems should be solved in time by those skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a hydraulic synchronization system based on volume control and mainly used for synchronization control in hydraulic transmission. An active adjustment deviation rectifying loop is designed in the system, and when deviation occurs in the operation process, the deviation can be actively adjusted and rectified according to a position signal fed back by an execution oil cylinder displacement sensor, so that the normal operation of the synchronous system is ensured. The hydraulic synchronous system mainly solves the problems that the hydraulic synchronous system can realize active oil supplement and passive oil supplement, is adjusted in real time, achieves an ideal synchronous effect, and is low in manufacturing cost and simple and convenient to use and maintain.
The invention is realized by the following technical scheme: a hydraulic synchronous system based on volume control structurally comprises: the system comprises an oil tank device (1), a pump unit (2), a one-way valve I (3), a one-way valve II (4), an electromagnetic overflow valve (5), a proportional directional valve (6), an electromagnetic directional valve (7), a one-way valve III (8), a one-way valve IV (9), a one-way speed regulating valve (10), a synchronizing device (11), a one-way valve V (12), a one-way valve VI (13), an electric break valve I (14), an electric break valve II (15), an overflow valve (16), a left execution oil cylinder (17) and a right execution oil cylinder (18); one pipeline of the oil tank device (1) is provided with a pump unit (2) and a one-way valve (3) which are used as an oil inlet pipeline of a hydraulic system to provide a power source, the other pipeline connected with the oil tank device (1) is used as an oil return pipeline, a one-way valve II (4) is arranged to establish certain oil return resistance, the oil return pipeline is ensured to be full of oil, and sufficient oil is provided for a passive oil supplementing loop; a pipeline between a one-way valve I (3) arranged on the oil inlet pipeline and a one-way valve II (4) arranged on the oil return pipeline is connected through an electromagnetic overflow valve (5),
one pipeline applies signals through a proportional reversing valve (6) and a proportional electromagnet BL2 which are arranged on the pipeline, a first electric on-off valve (14) and a second electric on-off valve (15) are electrified, pressure oil enters a synchronizing device (11), the synchronizing device (11) extends out, oil in a V0 cavity respectively enters a V1 cavity of a left execution oil cylinder (17) and a V1 cavity of a right execution oil cylinder (18) through the first electric on-off valve (14), the second electric on-off valve (15) and the pipeline,
the other pipeline is connected with the right-side execution oil cylinder through an electromagnetic directional valve (7), a one-way speed regulating valve (10) and an electric on-off valve II (15) which are sequentially arranged on the pipeline, an electromagnet DT2 of the arranged electromagnetic directional valve (7) is electrified, and oil in the pipeline of the right-side execution oil cylinder (18) returns to the oil tank device (1) through the one-way speed regulating valve (10) and the electromagnetic directional valve (7); an electromagnetic directional valve (7), a one-way speed regulating valve (10) and a first on-off valve (14) which are sequentially arranged on a pipeline are connected with the left execution oil cylinder, an electromagnet DT3 of the arranged electromagnetic directional valve (7) is electrified, and oil in the pipeline of the right execution oil cylinder (17) returns to the oil tank device (1) through the one-way speed regulating valve (10) and the electromagnetic directional valve (7);
an overflow valve (16) is arranged on an oil return pipeline between the left execution oil cylinder (17) and the right execution oil cylinder (18), the overflow valve (16) is connected with a synchronizing device (11) through a one-way valve five (12) and a one-way valve six (13) which are arranged on pipelines, and a proximity switch YJ is arranged at the bottom end of the synchronizing device (11);
a one-way valve I (3), a one-way valve II (4), a one-way valve III (8), a one-way valve IV (9),
The check valve five (12) and the check valve six (13) only allow hydraulic oil to flow through from one direction, and completely prevent the hydraulic oil from flowing in the reverse direction; the check valve III (8) and the check valve IV (9) form a passive oil supplementing loop of the system, and the check valve V (12), the check valve VI (13) and the overflow valve (16) form an active oil supplementing loop of the system; the second check valve (4) is provided with a return spring, the opening pressure is 1bar, the second check valve is arranged in the oil return pipeline, certain oil return resistance is established, the oil return pipeline is guaranteed to be full of oil, and sufficient oil is provided for a passive oil supplementing loop.
Preferably, the electromagnetic overflow valve (5) sets system safety pressure; before the pump unit (2) is started, the electromagnetic overflow valve (5) is electrified, the system is in a non-load state, and the pump unit (2) is flexibly started; the electromagnetic overflow valve 5 cannot be electrified, and the system is loaded and boosted to prepare for normal work.
Preferably, the V1 cavity arranged in the left side execution oil cylinder (17) and the right side execution oil cylinder (18) is a rodless cavity.
Preferably, the synchronizing device (11) is formed by connecting hydraulic cylinders with the same structural size in series through-shaft piston rods, the structural size of each cavity is the same, the volumes of all cavities are the same and are V0, and in the movement process, the outlet flow rates are the same; the volume of the synchronizer (11) V0 is larger than that of the cavity of the execution oil cylinder V1, so that the left execution oil cylinder (17) and the right execution oil cylinder (18) can extend to a working position when oil of the synchronizer (11) is discharged; a proximity switch YJ is provided at the bottom of the synchronization device (11) and triggers a signal when it is fully retracted.
Preferably, the overflow valve (16) sets pressure, and is in a closed state when the execution oil cylinder works normally; when the execution oil cylinder is completely retracted, the pressure of the system rises, the overflow valve (16) is opened, and oil enters the synchronizing device (11) through the five (12) one-way valve and the six (13) one-way valve, so that the synchronizing device (11) can be retracted in place in each working beat, the synchronizing device (11) and a pipeline are full of oil, and the consistency of the volume is kept.
Preferably, the oil tank device (1) is used as a storage device of a transmission medium of a hydraulic system and mainly used for storing oil, dissipating heat, precipitating impurities in oil and escaping air mixed in the oil; the oil tank device integrates an air filter, a liquid level meter, a temperature sensor, a filter, a heater and hydraulic accessories.
Preferably, the pump unit (2) mainly comprises a motor and a plunger pump and provides a power source for a hydraulic system.
Preferably, the proportional directional valve (6) is provided with an amplifier, and the control of the direction, the speed and the acceleration of the execution oil cylinder is realized by acquiring the displacement signal of the execution oil cylinder.
Preferably, the speed regulating valve (10) is a pressure and temperature compensation type valve, and controls and maintains the flow in the hydraulic circuit to be unchanged along with the change of the pressure load of the system and the viscosity of the temperature oil; the synchronous adjusting and rectifying circuit and the electromagnetic directional valve (7) form a synchronous adjusting and rectifying loop of the system.
Preferably, the first electric on-off valve (14) and the second electric on-off valve (15) control the opening, stopping and switching of oil, and the oil cylinder can be kept in position due to a leakage-free closing function.
Preferably, the control method is as follows:
the pump unit (2) provides an oil source, the electromagnetic overflow valve (5) is not electrified, and the hydraulic system builds pressure; when a signal is applied to a proportional electromagnet BL2 of a proportional reversing valve (6), a first electric on-off valve (14) and a second electric on-off valve (15) are electrified, pressure oil enters a synchronizing device (11) and stretches out, oil in a V0 cavity enters a V1 cavity of an execution oil cylinder through the first electric on-off valve (14), the second electric on-off valve (15) and a pipeline, the execution oil cylinder stretches out synchronously due to the fact that the oil flow discharged by the synchronizing device 11 is the same, the oil in a rod cavity of the execution oil cylinder returns to an oil tank through the proportional reversing valve, and a displacement sensor of the execution oil cylinder monitors the position in real time; when the load of the execution oil cylinder is unbalanced and the phenomenon of asynchronism occurs in the movement process, the electromagnetic directional valve (7) starts to work; when the load of the left execution oil cylinder is light, the left execution oil cylinder extends out quickly, an electromagnet DT3 of the electromagnetic directional valve (7) is electrified, and oil in the pipeline of the left execution oil cylinder returns to the oil tank through the speed regulating valve (10) and the electromagnetic directional valve (7);
after the execution oil cylinder is adjusted synchronously, the electromagnetic directional valve returns to the middle position; if the right execution oil cylinder extends out quickly, the electromagnetic directional valve DT2 is electrified, the actions are repeated, the deviation correction is adjusted in real time, and the real synchronization of the execution oil cylinder is ensured;
when a proportional electromagnet BL1 of a proportional reversing valve (6) applies a signal, a first electric on-off valve (14) and a second electric on-off valve (15) are electrified, pressure oil enters a rod cavity of the execution oil cylinder through a pipeline, oil in a rodless cavity of a V1 cavity of the execution oil cylinder enters a synchronizing device (11) through the first electric on-off valve (14), the second electric on-off valve (15) and the pipeline, the synchronizing device (11) retracts, the execution oil cylinder retracts synchronously at the moment, and a displacement sensor of the execution oil cylinder monitors the position in real time; when the load of the execution oil cylinder is unbalanced and the phenomenon of asynchronism occurs in the movement process, the electromagnetic directional valve (7) in the synchronous adjustment deviation rectifying loop starts to work;
when the execution oil cylinder retracts to the right position, the first electric on-off valve (14) and the second electric on-off valve (15) lose power, the execution oil cylinder keeps the position, pressure oil opens the overflow valve (16), and enters the synchronizing device (11) through the fifth check valve (12), the sixth check valve (13) and the pipeline respectively, so that the synchronizing device (11) retracts to the right position, the synchronizing device (11) and the pipeline are guaranteed to be filled with oil, the consistency of the volume is kept, and the proximity switch YJ sends a signal to prepare for the next working beat;
when the execution oil cylinder moves in an accelerated mode, a cavity is easily formed in the pipeline, at the moment, oil in the oil return pipeline respectively enters the execution oil cylinder movement pipeline through the three check valves (8) and the four check valves (9), the oil is supplemented, the cavity is avoided, and therefore the synchronization effect is further guaranteed.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: the technical scheme of the invention has simple and reasonable structural design and reliable work, and the system is provided with an active oil supplementing loop and a passive oil supplementing loop, thereby providing favorable conditions for a volume control mode; the hydraulic synchronous system can actively adjust and correct the deviation in real time under the condition that the load of the execution oil cylinder is unbalanced, so that the synchronization of the execution oil cylinder is realized, and the synchronization precision is controlled within 0.5%; meanwhile, the invention is easy to realize and suitable for popularization and application due to reasonable and simple structural design.
Drawings
FIG. 1 is a schematic diagram of the system connection relationship of the present invention;
FIG. 2 is a schematic diagram of the synchronous extension and adjustment of the actuating cylinders according to the present invention;
FIG. 3 is a schematic view of the synchronous retraction of the actuator cylinder according to the present invention;
FIG. 4 is a schematic diagram of the system of the present invention with active oil replenishment;
description of reference numerals:
1-a tank device; 2-a pump unit; 3-a one-way valve I; 4-a one-way valve II; 5-an electromagnetic overflow valve; 6-proportional reversing valve; 7-an electromagnetic directional valve; 8-one-way valve III; 9-check valve four; 10-one-way speed regulating valve; 11-a synchronization device; 12-one-way valve five; 13-one-way valve six; 14-a first electric on-off valve; 15-a second electric on-off valve; 16-relief valves; 17-left side actuating cylinder; 18-right-hand-side actuating cylinder.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in the figure, in the hydraulic synchronization system based on volume control, a pump unit 2 and a one-way valve I3 are arranged on one pipeline of an oil tank device 1 and serve as an oil inlet pipeline of a hydraulic system to provide a power source, the other pipeline connected with the oil tank device 1 serves as an oil return pipeline, a one-way valve II 4 is arranged to establish certain oil return resistance, the oil return pipeline is ensured to be full of oil, and sufficient oil is provided for a passive oil supplementing loop; the pipeline between the one-way valve I3 arranged on the oil inlet pipeline and the one-way valve II 4 arranged on the oil return pipeline is connected through an electromagnetic overflow valve 5,
one pipeline applies signals through a proportional reversing valve 6 and a proportional electromagnet BL2 which are arranged on the pipeline, the first electric on-off valve 14 and the second electric on-off valve 15 are electrified, pressure oil enters the synchronizing device 11, the synchronizing device 11 extends out, oil in the V0 cavity respectively enters the 17V1 cavity of the left execution oil cylinder and the 18V1 cavity of the right execution oil cylinder through the first electric on-off valve 14, the second electric on-off valve 15 and the pipeline,
the other pipeline is connected with the right-side execution oil cylinder through an electromagnetic directional valve 7, a one-way speed regulating valve 10 and an electric break-off valve II 15 which are sequentially arranged on the pipeline, an electromagnet DT2 of the arranged electromagnetic directional valve 7 is electrified, and oil in the pipeline of the right-side execution oil cylinder 18 returns to the oil tank device 1 through the one-way speed regulating valve 10 and the electromagnetic directional valve 7; the electromagnetic directional valve 7, the one-way speed regulating valve 10 and the first electric break valve 14 which are sequentially arranged on the pipeline are connected with the left execution oil cylinder, an electromagnet DT3 of the arranged electromagnetic directional valve 7 is electrified, and oil in the pipeline of the right execution oil cylinder 17 returns to the oil tank device 1 through the one-way speed regulating valve 10 and the electromagnetic directional valve 7;
an overflow valve 16 is arranged on an oil return pipeline between the left execution oil cylinder 17 and the right execution oil cylinder 18, the overflow valve 16 is connected with the synchronizing device 11 through a check valve five 12 and a check valve six 13 which are arranged on the pipeline, and the bottom end of the synchronizing device 11 is provided with a proximity switch YJ;
the one-way valve I3, the one-way valve II 4, the one-way valve III 8, the one-way valve IV 9, the one-way valve V12 and the one-way valve VI 13 only allow hydraulic oil to flow through from one direction and completely prevent reverse flow; the check valve III 8 and the check valve IV 9 form a passive oil supplementing loop of the system, and the check valve V12, the check valve VI 13 and the overflow valve 16 form an active oil supplementing loop of the system; the second check valve 4 is provided with a return spring, the opening pressure is 1bar, the second check valve is arranged in the oil return pipeline, certain oil return resistance is established, the oil return pipeline is guaranteed to be full of oil, and sufficient oil is provided for a passive oil supplementing loop.
In the specific implementation process, the electromagnetic overflow valve 5 sets the system safety pressure; before the pump unit 2 is started, the electromagnetic overflow valve 5 is electrified, the system is in a non-load state, and the pump unit 2 is flexibly started; the electromagnetic overflow valve 5 cannot be electrified, and the system is loaded and boosted to prepare for normal work.
In the specific implementation process, the V1 cavities arranged in the left execution oil cylinder 17 and the right execution oil cylinder 18 are rodless cavities.
In the specific implementation process, the synchronizer 11 is formed by connecting hydraulic cylinders with the same structure and size in series through-shaft piston rods, the structure and size of each cavity are the same, the volumes of all the cavities are the same and are V0, and in the movement process, the outlet flow is the same; the volume of V0 in the synchronizer 11 is larger than the volume of the V1 cavity of the execution oil cylinder, so that the left execution oil cylinder 17 and the right execution oil cylinder 18 can extend to the working position when oil in the synchronizer 11 is discharged; a proximity switch YJ provided at the bottom end of the synchronizer 11 may trigger a signal when it is fully retracted.
In the specific implementation process, the pressure of the overflow valve 16 is set, and the overflow valve is in a closed state when the execution oil cylinder works normally; when the execution oil cylinder is completely retracted, the system pressure rises, the overflow valve 16 is opened, and oil enters the synchronizing device 11 through the five check valves 12 and the six check valves 13, so that the synchronizing device 11 can be retracted in place in each working beat, the synchronizing device 11 and a pipeline are full of oil, and the consistency of the volume is kept.
In the specific implementation process, the oil tank device 1 is used as a storage device of a transmission medium of a hydraulic system and mainly used for storing oil, dissipating heat, precipitating impurities in oil and escaping air mixed in the oil; the oil tank device integrates an air filter, a liquid level meter, a temperature sensor, a filter, a heater and hydraulic accessories.
In the specific implementation process, the pump unit 2 mainly comprises a motor and a plunger pump and provides a power source for a hydraulic system.
In the specific implementation process, the proportional directional valve 6 is provided with an amplifier, and the control of the direction, the speed and the acceleration of the execution oil cylinder is realized by collecting the displacement signal of the execution oil cylinder.
In the specific implementation process, the speed regulating valve 10 is a pressure and temperature compensation type valve, and controls and maintains the flow in the hydraulic circuit to be unchanged along with the change of the pressure load of the system and the viscosity of the temperature oil; the synchronous adjusting and rectifying circuit and the electromagnetic directional valve 7 form a synchronous adjusting and rectifying loop of the system.
In the specific implementation process, the first electric on-off valve 14 and the second electric on-off valve 15 control the opening, stopping and switching of oil, the leakage-free closing function is achieved, and the position maintenance of the execution oil cylinder can be achieved.
The control method of the invention comprises the following steps:
in the specific implementation process, the pump unit 2 provides an oil source, the electromagnetic overflow valve 5 is not electrified, and the hydraulic system builds pressure. When a signal is applied to a proportional electromagnet BL2 of a proportional reversing valve 6, the power-on/off valves 14 and 15 are powered on, pressure oil enters the synchronizing device, the synchronizing device extends out, oil in the V0 cavity enters the V1 cavity of the execution oil cylinder through the first power-on/off valve 14, the second power-on/off valve 15 and a pipeline, the execution oil cylinder extends out synchronously due to the fact that oil flows discharged by the synchronizing device 11 are the same, the oil in the rod cavity of the execution oil cylinder returns to an oil tank through the proportional reversing valve, and a displacement sensor of the execution oil cylinder monitors the position in real time; when the load of the execution oil cylinder is unbalanced and the phenomenon of asynchronism occurs in the movement process, the electromagnetic directional valve 7 starts to work.
In the specific implementation process, when the load of the left execution oil cylinder is light, the left execution oil cylinder extends out quickly, the electromagnet DT3 of the electromagnetic directional valve 7 is electrified, and oil in the pipeline of the left execution oil cylinder returns to the oil tank through the speed regulating valve 10 and the electromagnetic directional valve 7 (as shown in fig. 2). And after the execution oil cylinder is adjusted synchronously, the electromagnetic directional valve returns to the middle position. When the right execution oil cylinder extends out quickly, the electromagnetic directional valve DT2 is electrified, the actions are repeated, the deviation correction is adjusted in real time, and the real synchronization of the execution oil cylinders is ensured.
In the specific implementation process, when the proportional reversing valve 6 applies a signal to the proportional electromagnet BL1, the first electrical on-off valve 14 and the second electrical on-off valve 15 are powered on, pressure oil enters the rod cavity of the execution oil cylinder through the pipeline, oil in the rodless cavity of the V1 cavity of the execution oil cylinder enters the synchronizer 11 through the first electrical on-off valve 14, the second electrical on-off valve 15 and the pipeline, the synchronizer 11 retracts, the execution oil cylinder retracts synchronously at the moment, and the displacement sensor of the execution oil cylinder monitors the position in real time (as shown in FIG. 3). When the load of the execution oil cylinder is unbalanced and the phenomenon of asynchronism occurs in the movement process, the electromagnetic directional valve 7 in the synchronous adjustment deviation rectifying loop starts to work.
In the specific implementation process, when the execution oil cylinder retracts to the right position, the first electric on-off valve 14 and the second electric on-off valve 15 lose electricity, the execution oil cylinder keeps the position, pressure oil opens the overflow valve 16 at the moment, and enters the synchronizing device 11 through the five check valves 12, the six check valves 13 and the pipeline respectively, so that the synchronizing device 11 retracts to the right position, the synchronizing device 11 and the pipeline are guaranteed to be filled with oil, the consistency of the volume is kept, the proximity switch YJ sends a signal, and preparation is made for the next working beat. (as shown in FIG. 4)
In the specific implementation process, when the execution oil cylinder moves in an accelerated mode, a cavity is easily formed in the pipeline, at the moment, oil in the oil return pipeline respectively enters the execution oil cylinder movement pipeline through the three check valves 8 and the four check valves 9 to supplement the oil, the cavity is avoided, and therefore the synchronization effect is further guaranteed.
The synchronizer is provided with the proximity switch, so that the synchronizer can be monitored and ensured to run in place each time; the system is provided with an oil supplementing loop, and the passive oil supplementing loop prevents vacuum in the process of executing acceleration and deceleration movement of the oil cylinder; the active oil supplementing loop supplements oil to the synchronizing device in each working cycle, so that the synchronizing device and a pipeline are full of oil, and the consistency of the volume is kept. The system is provided with a synchronous adjustment deviation rectifying loop, and when deviation occurs in the operation process, deviation rectifying can be actively carried out according to the feedback position of the execution oil cylinder displacement sensor, so that the normal operation of the synchronous system is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A hydraulic synchronization system based on volume control is characterized by comprising an oil tank device (1), a pump unit (2), a one-way valve I (3), a one-way valve II (4), an electromagnetic overflow valve (5), a proportional reversing valve (6), an electromagnetic reversing valve (7), a one-way valve III (8), a one-way valve IV (9), a one-way speed regulating valve (10), a synchronization device (11), a one-way valve V (12), a one-way valve VI (13), an electric on-off valve I (14), an electric on-off valve II (15), an overflow valve (16), a left execution oil cylinder (17) and a right execution oil cylinder (18);
one pipeline of the oil tank device (1) is provided with a pump unit (2) and a one-way valve (3) which are used as an oil inlet pipeline of a hydraulic system to provide a power source, the other pipeline connected with the oil tank device (1) is used as an oil return pipeline, a one-way valve II (4) is arranged to establish certain oil return resistance, the oil return pipeline is ensured to be full of oil, and sufficient oil is provided for a passive oil supplementing loop; a pipeline between a one-way valve I (3) arranged on the oil inlet pipeline and a one-way valve II (4) arranged on the oil return pipeline is connected through an electromagnetic overflow valve (5),
one pipeline applies signals through a proportional reversing valve (6) and a proportional electromagnet BL2 which are arranged on the pipeline, a first electric on-off valve (14) and a second electric on-off valve (15) are electrified, pressure oil enters a synchronizing device (11), the synchronizing device (11) extends out, oil in a V0 cavity respectively enters a V1 cavity of a left execution oil cylinder (17) and a V1 cavity of a right execution oil cylinder (18) through the first electric on-off valve (14), the second electric on-off valve (15) and the pipeline,
the other pipeline is connected with the right-side execution oil cylinder through an electromagnetic directional valve (7), a one-way speed regulating valve (10) and an electric on-off valve II (15) which are sequentially arranged on the pipeline, an electromagnet DT2 of the arranged electromagnetic directional valve (7) is electrified, and oil in the pipeline of the right-side execution oil cylinder (18) returns to the oil tank device (1) through the one-way speed regulating valve (10) and the electromagnetic directional valve (7); an electromagnetic directional valve (7), a one-way speed regulating valve (10) and a first on-off valve (14) which are sequentially arranged on a pipeline are connected with the left execution oil cylinder, an electromagnet DT3 of the arranged electromagnetic directional valve (7) is electrified, and oil in the pipeline of the right execution oil cylinder (17) returns to the oil tank device (1) through the one-way speed regulating valve (10) and the electromagnetic directional valve (7);
an overflow valve (16) is arranged on an oil return pipeline between the left execution oil cylinder (17) and the right execution oil cylinder (18), the overflow valve (16) is connected with a synchronizing device (11) through a one-way valve five (12) and a one-way valve six (13) which are arranged on pipelines, and a proximity switch YJ is arranged at the bottom end of the synchronizing device (11);
a one-way valve I (3), a one-way valve II (4), a one-way valve III (8), a one-way valve IV (9),
The check valve five (12) and the check valve six (13) only allow hydraulic oil to flow through from one direction, and completely prevent the hydraulic oil from flowing in the reverse direction; the check valve III (8) and the check valve IV (9) form a passive oil supplementing loop of the system, and the check valve V (12), the check valve VI (13) and the overflow valve (16) form an active oil supplementing loop of the system; the second check valve (4) is provided with a return spring, the opening pressure is 1bar, the second check valve is arranged in the oil return pipeline, certain oil return resistance is established, the oil return pipeline is guaranteed to be full of oil, and sufficient oil is provided for a passive oil supplementing loop.
2. A hydraulic synchronization system based on volume control according to claim 1, characterized by an electromagnetic spill valve (5) setting the system relief pressure; before the pump unit (2) is started, the electromagnetic overflow valve (5) is electrified, the system is in a non-load state, and the pump unit (2) is flexibly started; the electromagnetic overflow valve (5) is not electrified, and the system is loaded and boosted to prepare for normal work.
3. A hydraulic synchronization system based on volume control according to claim 1, characterized in that the V1 chambers provided in the left and right actuating cylinders (17, 18) are rodless chambers.
4. The hydraulic synchronization system based on volume control as claimed in claim 1, characterized in that the synchronization device (11) is formed by connecting hydraulic cylinders with the same structure and size in series through-shaft piston rods, the structure and size of each cavity are the same, the volume of each cavity is the same and is V0, and the outlet flow is the same during the movement; the volume of the synchronizer (11) V0 is larger than that of the cavity of the execution oil cylinder V1, so that the left execution oil cylinder (17) and the right execution oil cylinder (18) can extend to a working position when oil of the synchronizer (11) is discharged; a proximity switch YJ is provided at the bottom of the synchronization device (11) and triggers a signal when it is fully retracted.
5. The hydraulic synchronous system based on volume control as claimed in claim 1, characterized in that the relief valve (16) sets pressure, and is in a closed state when the normal operation of the execution cylinder is performed; when the execution oil cylinder is completely retracted, the pressure of the system rises, the overflow valve (16) is opened, and oil enters the synchronizing device (11) through the five (12) one-way valve and the six (13) one-way valve, so that the synchronizing device (11) can be retracted in place in each working beat, the synchronizing device (11) and a pipeline are full of oil, and the consistency of the volume is kept.
6. The hydraulic synchronous system based on volume control as claimed in claim 1, characterized in that the proportional directional valve (6) is configured with an amplifier to realize the control of the direction, speed and acceleration of the actuating cylinder by collecting the actuating cylinder displacement signal.
7. A hydraulic synchronisation system based on volume control according to claim 1, characterised in that the governor valve (10) is a pressure and temperature compensated type valve, controlling and maintaining the flow in the hydraulic circuit constant with changes in system pressure load and temperature oil viscosity; the synchronous adjusting and rectifying circuit and the electromagnetic directional valve (7) form a synchronous adjusting and rectifying loop of the system.
8. The hydraulic synchronization system based on volume control as claimed in claim 1, wherein the first electrical on-off valve (14) and the second electrical on-off valve (15) control the opening, stopping and switching of the oil, and the position maintenance of the actuating cylinder can be realized for a leakage-free closing function.
9. The hydraulic synchronous system based on volume control as claimed in claim 1, characterized in that the control method is as follows: the pump unit (2) provides an oil source, the electromagnetic overflow valve (5) is not electrified, and the hydraulic system builds pressure; when a signal is applied to a proportional electromagnet BL2 of a proportional reversing valve (6), a first electrical on-off valve (14) and a second electrical on-off valve (15) are powered on, pressure oil enters a synchronizing device, the synchronizing device extends out, oil in a V0 cavity enters a left-side execution oil cylinder and a right-side execution oil cylinder V1 cavity through the first electrical on-off valve (14), the second electrical on-off valve (15) and a pipeline, the execution oil cylinders synchronously extend out due to the fact that oil flows discharged by the synchronizing device (11) are the same, the oil in a rod cavity of the execution oil cylinder returns to an oil tank through the proportional reversing valve, and a displacement sensor of the execution oil cylinder monitors the position in real time; when the load of the execution oil cylinder is unbalanced and the phenomenon of asynchronism occurs in the movement process, the electromagnetic directional valve (7) starts to work; when the load of the left execution oil cylinder is light, the left execution oil cylinder extends out quickly, an electromagnet DT3 of the electromagnetic directional valve (7) is electrified, and oil in the pipeline of the left execution oil cylinder returns to the oil tank through the speed regulating valve (10) and the electromagnetic directional valve (7); after the execution oil cylinder is adjusted synchronously, the electromagnetic directional valve returns to the middle position; when the right execution oil cylinder extends out quickly, the electromagnetic directional valve DT2 is electrified, the actions are repeated, the deviation correction is adjusted in real time, and the real synchronization of the execution oil cylinder is ensured;
when a proportional electromagnet BL1 of a proportional reversing valve (6) applies a signal, a first electric on-off valve (14) and a second electric on-off valve (15) are electrified, pressure oil enters a rod cavity of the execution oil cylinder through a pipeline, oil in a rodless cavity of a V1 cavity of the execution oil cylinder enters a synchronizing device (11) through the first electric on-off valve (14), the second electric on-off valve (15) and the pipeline, the synchronizing device (11) retracts, the execution oil cylinder retracts synchronously at the moment, and a displacement sensor of the execution oil cylinder monitors the position in real time; when the load of the execution oil cylinder is unbalanced and the phenomenon of asynchronism occurs in the movement process, the electromagnetic directional valve (7) in the synchronous adjustment deviation rectifying loop starts to work;
when the execution oil cylinder retracts to the right position, the first electric on-off valve (14) and the second electric on-off valve (15) lose power, the execution oil cylinder keeps the position, pressure oil opens the overflow valve (16), and enters the synchronizing device (11) through the fifth check valve (12), the sixth check valve (13) and the pipeline respectively, so that the synchronizing device (11) retracts to the right position, the synchronizing device (11) and the pipeline are guaranteed to be filled with oil, the consistency of the volume is kept, and the proximity switch YJ sends a signal to prepare for the next working beat;
when the execution oil cylinder moves in an accelerated mode, a cavity is easily formed in the pipeline, at the moment, oil in the oil return pipeline respectively enters the execution oil cylinder movement pipeline through the three check valves (8) and the four check valves (9), the oil is supplemented, the cavity is avoided, and therefore the synchronization effect is further guaranteed.
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