CN114508483B - Power adjusting system and adjusting method of hydraulic pump - Google Patents
Power adjusting system and adjusting method of hydraulic pump Download PDFInfo
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- CN114508483B CN114508483B CN202210192430.2A CN202210192430A CN114508483B CN 114508483 B CN114508483 B CN 114508483B CN 202210192430 A CN202210192430 A CN 202210192430A CN 114508483 B CN114508483 B CN 114508483B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention provides a power regulating system and a regulating method of a hydraulic pump, wherein a driving motor drives a variable-power hydraulic mechanism to operate and supplies oil to an executing mechanism through an oil guide loop, a controller collects pressure feedback data and flow feedback data of the executing mechanism through a detecting unit, and when a system of the executing mechanism in a constant-power operation mode is judged to release power, a control signal is generated to the variable-power hydraulic mechanism so as to enable the variable-power hydraulic mechanism to release power, and the problem that an executing mechanism overflows from a pressure cut-off valve and cannot execute actions when the executing mechanism encounters an excessive load working condition in the prior art is solved.
Description
Technical Field
The invention relates to the field of hydraulic systems, in particular to a power adjusting system and a power adjusting method of a hydraulic pump.
Background
The hydraulic system transmission has the advantages of small volume, light weight, large driving force and the like, and is matched with an internal combustion engine to provide a power source, so that the hydraulic system transmission is widely moved to industries such as industrial equipment, engineering machinery and the like. According to the working characteristics of the traditional internal combustion engine, in order to ensure a good fuel utilization rate, certain requirements are imposed on the rotating speed and the torque of the internal combustion engine. In order to match the characteristic of the internal combustion engine, the hydraulic system develops means such as pressure control, flow control, power control and the like, and the working efficiency of the system is improved as much as possible. The power control is mainly constant power control, the control mode considers the operation characteristic of the internal combustion engine, the matching of the system pressure and the flow is reflected to the hydraulic system, and the control mode of the variable pump on the system flow is evolved.
For the constant power control of the hydraulic pump, when the system pressure and flow reach the constant power operation stage, the system flow can reduce the displacement of the variable pump along with the rising of the system pressure due to the action of the constant power valve in the variable pump, so that the constant power operation is realized. The principle of the control method is as follows: the left end of the valve core of the constant power valve is introduced with a main oil way pressure oil signal, and the right end is provided with a spring. When the system pressure is lower, the spring force is larger than the system pressure, the constant power valve is operated at the right position, the oil cavity at the left end of the variable mechanism returns to the oil tank, the valve core moves left, and the hydraulic pump works at the maximum displacement position; when the system pressure reaches the spring force, the constant pressure valve operates at the middle position; when the system pressure continues to rise, so that the valve core of the constant power valve moves rightwards, the constant power valve works at the left position, the main oil way enters an oil cavity at the left end of the variable mechanism, so that the valve core of the variable mechanism moves rightwards, the displacement of the variable pump is reduced, the system flow is reduced, meanwhile, the valve core of the variable mechanism drives the valve sleeve of the constant power valve to move rightwards through a connecting rod, at the moment, the constant power valve operates at the middle position again, if the system pressure continues to rise, the process is repeated, the displacement of the hydraulic pump is adjusted to match the system pressure, and the hydraulic pump operates at a constant power operation stage.
The typical constant-power hydraulic pump has the defects that the typical constant-power hydraulic pump is limited by the operation characteristics of a traditional internal combustion engine, when the system is in heavy load working condition, the flow rate of the system is reduced along with the increase of the pressure of the system, so that an obvious speed reduction phenomenon occurs to an actuator, and when the working condition of excessive load is met, an actuator loop overflows from a pressure cut-off valve, and the action cannot be executed.
In view of this, the present application is presented.
Disclosure of Invention
The invention discloses a power regulating system and a power regulating method of a hydraulic pump, and aims to solve the problem that an actuator loop overflows from a pressure cut-off valve and cannot execute actions when an actuator in the prior art encounters an excessive load working condition.
The first embodiment of the present invention discloses a power adjustment system of a hydraulic pump, comprising: the device comprises a controller, a driving motor, a variable-power hydraulic mechanism, an oil guide loop, a detection unit and an execution mechanism;
the output end of the controller is electrically connected with the control end of the variable power hydraulic mechanism, and the output shaft of the driving motor is connected with the variable power hydraulic mechanism;
the variable-power hydraulic mechanism is connected with the executing mechanism through the oil guide loop, and the detecting unit is configured on the executing mechanism;
the detection unit is configured to collect pressure information and flow information of the execution mechanism, and the controller is configured to judge that the variable-power hydraulic mechanism is in a constant power interval according to the pressure information and the flow information and provide output power of the variable-power hydraulic mechanism when an operator needs to enter a power release state stage.
Preferably, the variable power hydraulic mechanism includes: the system comprises a variable pump, a pilot constant displacement pump, a variable mechanism, a constant power valve, an electric proportional overflow valve and a valve assembly;
the variable pump is connected with the driving motor through a spline shaft, the pilot constant delivery pump is coaxially connected with the variable pump, the input ends of the variable pump and the pilot constant delivery pump are used for being connected with an oil tank, and the pilot constant delivery pump is connected with the electric proportional overflow valve and the executing mechanism through the valve assembly; the variable pump, the variable mechanism and the constant power valve are connected with the oil guide loop; the electric proportional overflow valve is connected with the constant power valve, the constant power valve is connected with the variable mechanism, and the variable mechanism is connected with the variable pump;
the control end of the electric proportional relief valve and the output end of the controller are configured to receive signals of the controller and adjust the valve core position of the constant-power valve;
the variable mechanism is configured to adjust the variable pump according to a spool position of the constant power valve.
Preferably, the variable mechanism includes: the first valve core, the left end oil cavity and the right end oil cavity;
the right-end oil cavity is connected with the input end of the oil guide loop, the left-end oil cavity is connected with the j port of the constant power valve, the first valve core is connected with the constant power valve through a loop bar, and the first valve core is connected with the variable pump through a connecting rod.
Preferably, the valve assembly comprises: a first relief valve and a constant pressure valve;
the input end of the first overflow valve and the input end of the constant pressure valve are connected with the output end of the pilot constant displacement pump, the output end of the first overflow valve is used for being connected with an oil tank, the output end of the constant pressure valve is connected with the t port of the electric proportional overflow valve, and the output end of the constant pressure valve is connected with the executing mechanism.
Preferably, the constant power valve is a three-position three-way valve;
the hydraulic pressure ejector pin and the connecting spring are arranged at the left end of the constant power valve, and the hydraulic pressure ejector pin is connected with the n port of the electric proportional overflow valve.
Preferably, the oil guide circuit includes: a one-way valve and a second overflow valve;
the input end of the one-way valve is connected with the output end of the variable pump, the input end of the second overflow valve is connected with the output end of the variable pump, the output end of the second overflow valve is connected with the oil tank, and the output end of the one-way valve is connected with the input end of the executing mechanism.
Preferably, the actuator comprises: the hydraulic control system comprises a pilot valve, a three-position six-way valve, an execution oil cylinder, a rod cavity overflow valve and a rodless cavity overflow valve;
the input end of the pilot valve is connected with the output end of the valve assembly, the first output end of the pilot valve is connected with the e end of the three-position six-way valve, the second output end of the pilot valve is connected with the f end of the three-position six-way valve, the t end and the d end of the three-position six-way valve are connected with the oil tank, the output end of the oil guide loop is connected with the p end and the c end of the three-position six-way valve, the a end and the b end of the three-position six-way valve are respectively connected with a rod cavity and a rodless cavity of the execution oil cylinder, and the rod cavity overflow valve and the rodless cavity overflow valve are respectively connected with a rod cavity interface and a rodless cavity interface of the execution oil cylinder.
Preferably, the detection unit includes a first flowmeter, a second flowmeter, a first pressure sensor, and a second pressure sensor electrically connected to an input of the controller;
the first flowmeter and the second flowmeter are respectively arranged at a rod cavity interface and a rodless cavity interface of the execution oil cylinder;
the first pressure sensor and the second pressure sensor are respectively configured at a first output end and a second output end of the pilot valve.
The second embodiment of the invention discloses a power adjusting method of a hydraulic pump, comprising the following steps:
acquiring flow feedback data acquired through a first flow meter and a second flow meter which are arranged at a rod cavity interface and a rodless cavity interface of an execution oil cylinder;
acquiring pressure feedback data acquired by a first pressure sensor and a second pressure sensor arranged at a first output end and a second output end of a pilot valve;
judging whether the system in the constant power operation mode needs to release power or not according to the pressure feedback data and the flow feedback data;
if so, generating a control signal to the electric proportional overflow valve so that the electric proportional overflow valve acts on the hydraulic ejector pin of the constant power valve, and further improving the displacement of the scalar pump.
Preferably, the system in the constant power operation mode is judged whether to need power release according to the pressure feedback data and the flow feedback data; the method comprises the following steps:
when the feedback data increases according to the pressure data and the flow feedback data decreases, the system in the constant power operation mode is defined to need to release power.
According to the power regulating system and the power regulating method for the hydraulic pump, the driving motor drives the variable-power hydraulic mechanism to operate, oil is supplied to the executing mechanism through the oil guide loop, the controller collects pressure feedback data and flow feedback data of the executing mechanism through the detecting unit, and when the system of the executing mechanism in a constant-power operation mode is judged to be required to release power, a control signal is generated to the variable-power hydraulic mechanism, so that the variable-power hydraulic mechanism is enabled to release power, and the problem that an actuator loop overflows from a pressure cut-off valve and cannot execute actions when the actuator in the prior art encounters an oversized-load working condition is solved.
Drawings
Fig. 1 is a schematic structural view of a power adjusting system of a hydraulic pump according to a first embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for regulating the power of a hydraulic pump according to a first embodiment of the present invention;
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention discloses a power regulating system and a power regulating method of a hydraulic pump, and aims to solve the problem that an actuator loop overflows from a pressure cut-off valve and cannot execute actions when an actuator in the prior art encounters an excessive load working condition.
Referring to fig. 1, a first embodiment of the present invention discloses a power adjusting system of a hydraulic pump, comprising: the device comprises a controller 10, a driving motor 2, a variable-power hydraulic mechanism, an oil guide loop, a detection unit and an executing mechanism;
the detection unit is electrically connected with the input end of the controller 10, the output end of the controller 10 is electrically connected with the control end of the variable power hydraulic mechanism, and the output shaft of the driving motor 2 is connected with the variable power hydraulic mechanism;
the variable-power hydraulic mechanism is connected with the executing mechanism through the oil guide loop, and the detecting unit is configured on the executing mechanism;
the detection unit is configured to collect pressure information and flow information of the executing mechanism, and the controller 10 is configured to judge that the variable-power hydraulic mechanism is in a constant power interval according to the pressure information and the flow information, and provide output power of the variable-power hydraulic mechanism when an operator needs to enter a power release state stage.
It should be noted that, by collecting flow information fed back by the rod cavity and the rodless cavity of the execution cylinder 16 of the execution mechanism, the current running state of the execution mechanism is estimated; and the driving intention of the driver is evaluated by collecting pressure information fed back by the pilot oil paths with rod cavities and without rod cavities of the hydraulic cylinder. By comprehensively evaluating the flow feedback signal of the actuator and the pressure feedback signal of the pilot oil way, whether a driver runs to the current constant power interval of the hydraulic pump is judged, and the actuator is expected to have higher power output, so that the power of the variable-power hydraulic mechanism is provided, and the function of releasing the power of the hydraulic pump is realized. In view of the fact that the motor can operate in an overload mode in a short time, the variable pump 1 of the variable power hydraulic mechanism can operate in a variable power mode, accordingly, the power of the variable pump 1 is released by matching with the motor, overload operation of the hydraulic system is achieved under certain conditions, and the problem that an actuating mechanism cannot achieve operation requirements due to insufficient power of the hydraulic system under overload is solved.
In one possible embodiment of the invention, the variable power hydraulic mechanism comprises: the variable pump 1, the pilot constant displacement pump 3, the variable mechanism 4, the constant power valve 5, the electric proportional overflow valve 7 and the valve component;
the variable pump 1 is connected with the driving motor 2 through a spline shaft, the pilot constant displacement pump 3 is coaxially connected with the variable pump 1, the input ends of the variable pump 1 and the pilot constant displacement pump 3 are used for being connected with an oil tank 22, and the pilot constant displacement pump 3 is connected with the electric proportional overflow valve 7 and the executing mechanism through the valve assembly; the variable pump 1, the variable mechanism 4 and the constant power valve 5 are connected with the oil guide loop; the electric proportional overflow valve 7 is connected with the constant power valve 5, the constant power valve 5 is connected with the variable mechanism 4, and the variable mechanism 4 is connected with the variable pump 1;
the control end of the electric proportional overflow valve 7 and the output end of the controller 10, the electric proportional overflow valve 7 is configured to receive the signal of the controller 10 and adjust the valve core position of the constant power valve 5;
the variable displacement mechanism 4 is configured to adjust the variable displacement pump 1 according to the spool position of the constant power valve 5.
The variable pump 1, the pilot constant displacement pump 3 and the driving motor 2 are coaxially connected, wherein when receiving a control signal, the electric proportional overflow valve 7 provides corresponding pressure oil to enter the constant power valve 5 to adjust the valve core position of the constant power valve 5, and then the variable pump 1 is adjusted by changing the variable mechanism 4 so as to increase the output power of the variable pump 1.
In one possible embodiment of the present invention, the constant power valve 5 is a three-position three-way valve;
the k end of the constant power valve 5 is connected with the oil tank 22, the l end and the m end of the constant power valve 5 are connected with the output end of the variable pump 1, the left end of the constant power valve 5 is provided with a hydraulic thimble and a connecting spring, and the hydraulic thimble is connected with the n port of the electric proportional overflow valve 7.
When receiving the control signal, the electric proportional overflow valve 7 provides corresponding pressure oil n to enter the hydraulic thimble oil cavity to push the hydraulic thimble to extrude the right end of the valve core of the constant power valve 5, so as to improve the starting and regulating pressure of the constant power valve 5, and after the starting and regulating pressure, the valve core of the constant power valve 5 moves left, and the variable displacement mechanism 4 is controlled to regulate the displacement of the variable displacement pump 1.
In one possible embodiment of the present invention, the variable mechanism 4 includes: the first valve core, the left end oil cavity and the right end oil cavity;
the right-end oil cavity is connected with the input end of the oil guide loop, the left-end oil cavity is connected with the j port of the constant power valve 5, the first valve core is connected with the constant power valve 5 through a loop bar, and the first valve core is connected with the variable pump 1 through a connecting rod.
After the constant power valve 5 starts to regulate pressure, the valve core of the constant power valve 5 moves right, works at the left position, regulates the left movement of the first valve core through the loop bar, and simultaneously drives the connecting rod to rotate clockwise, so that the inclination angle of the swash plate plunger pump (variable pump 1) can be increased, and the displacement of the variable pump 1 is increased. When the system pressure continues to be increased and reaches the overflow pressure of the valve assembly, the hydraulic system overflows from the valve assembly, so that the operation safety of the system is ensured.
In one possible embodiment of the invention, the valve assembly comprises: a first relief valve 9 and a constant pressure valve 8;
the input end of the first overflow valve 9 and the input end of the constant pressure valve 8 are connected with the output end of the pilot constant displacement pump 3, the output end of the first overflow valve 9 is used for being connected with an oil tank 22, the output end of the constant pressure valve 8 is connected with the t port of the electric proportional overflow valve 7, and the output end of the constant pressure valve 8 is connected with the executing mechanism.
It should be noted that, the pressure oil outlet connects in parallel with the first overflow valve 9 and the constant pressure valve 8, one path of the constant pressure valve 8 is connected with the pilot valve 13 of the actuating mechanism, and provides pilot hydraulic oil for the hydraulic system, when the system pressure reaches the overflow pressure of the first overflow valve 9, the hydraulic system overflows from the first overflow valve 9 to the oil tank, so as to ensure the operation safety of the system.
In one possible embodiment of the invention, the oil guide circuit comprises: a check valve 20 and a second relief valve 21;
the input end of the one-way valve 20 is connected with the output end of the variable pump 1, the input end of the second overflow valve 21 is connected with the output end of the variable pump 1, the output end of the second overflow valve 21 is connected with the oil tank, and the output end of the one-way valve 20 is connected with the input end of the actuating mechanism.
The main oil way of the oil outlet of the variable pump 1 is connected with a check valve 20 and a second overflow valve 21 in parallel, wherein the second overflow valve 21 is used for guaranteeing the maximum pressure of system operation, and the check valve 20 is used for guaranteeing the unidirectional oil supply of the variable power hydraulic mechanism to the actuating mechanism.
In one possible embodiment of the invention, the actuator comprises: pilot valve 13, three-position six-way valve 19, actuating cylinder 16, rod cavity overflow valve 17 and rodless cavity overflow valve 18;
the input end of the pilot valve 13 is connected with the output end of the valve assembly, the first output end of the pilot valve 13 is connected with the e end of the three-position six-way valve 19, the second output end of the pilot valve 13 is connected with the f end of the three-position six-way valve 19, the t end and the d end of the three-position six-way valve 19 are connected with the oil tank, the output end of the oil guide loop is connected with the p end and the c end of the three-position six-way valve 19, the a end and the b end of the three-position six-way valve 19 are respectively connected with a rod cavity and a rodless cavity of the execution oil cylinder 16, and the rod cavity overflow valve 17 and the rodless cavity overflow valve 18 are respectively connected with a rod cavity interface and a rodless cavity interface of the execution oil cylinder 16.
In one possible embodiment of the invention, the detection unit comprises a first flow meter 15, a second flow meter 14, a first pressure sensor 12, and a second pressure sensor 11 electrically connected to the input of the controller 10;
wherein the first flowmeter 15 and the second flowmeter 14 are respectively arranged at a rod cavity interface and a rodless cavity interface of the execution cylinder 16;
the first pressure sensor 12 and the second pressure sensor 11 are respectively disposed at a first output end and a second output end of the pilot valve 13.
The following describes the operation of the entire system:
when the system starts to operate, the hydraulic ejector pin pressure of the constant power valve 5 is zero, only the spring presses the right end of the valve core of the constant power valve 5, the main oil way pressure signal m is very low, the constant power valve 5 works at the right position, the oil cavity at the left end of the variable mechanism 4 returns to the oil tank, and the valve core moves left, so that the variable pump 1 works at the maximum displacement; when the pressure m of the hydraulic system is equal to the spring force, the constant power valve 5 operates in the middle position, the first valve core position of the variable mechanism 4 is kept unchanged, and the variable pump 1 keeps the maximum displacement operation; when the pressure m of the hydraulic system is greater than the spring force, the valve core of the constant power valve 5 moves rightwards, hydraulic oil in a main oil way enters an oil cavity at the left end of the variable mechanism 4, the valve core moves rightwards to reduce the displacement of the variable pump 1, meanwhile, the first valve core of the variable mechanism 4 drives the valve sleeve of the constant power valve 5 to move rightwards through a connecting rod to ensure that the constant power valve 5 works in the middle position again, the valve core of the variable mechanism 4 stops moving, the variable pump 1 keeps the current displacement to operate, the hydraulic system enters a constant power operation mode, and the pressure is regulated to be the spring force;
when the system enters a constant power operation mode, the first flowmeter 15 and the second flowmeter 14 monitor the flow information of the rod cavity and the rodless cavity of the execution cylinder 16 and feed back the flow information to the controller 10; the first pressure sensor 12 and the second pressure sensor 11 monitor pilot hydraulic signals e and f and feed back the signals to the controller 10; in the constant power mode of operation, as system pressure increases, system flow decreases, so the flow feedback signal decreases, and when the pilot pressure feedback signal increases, it indicates that the driver needs a faster operating speed of the actuator cylinder 16, thereby inferring that the driver needs the hydraulic system to enter the power release phase;
the controller 10 makes a decision that the hydraulic system enters a power release stage according to the actuator flow feedback signal and the pilot pressure feedback signal, and sends an electric signal i to the electric proportional overflow valve 7 so as to enable corresponding pressure oil to be output into an oil cavity of the hydraulic thimble, and the right end of a valve core of the constant power valve 5 is extruded, so that the starting and regulating pressure of the constant power valve 5 is improved;
after the rising of the regulating pressure, the valve core of the constant power valve 5 moves left, works at the right position, and the left end oil cavity oil return tank of the variable mechanism 4 moves left, so that the displacement of the variable pump 1 is increased, the flow of a hydraulic system is improved, and the power release of the hydraulic pump is realized;
when the system pressure continues to be increased and reaches the overflow pressure of the second overflow valve 21, the hydraulic system overflows from the second overflow valve 21, so that the operation safety of the system is ensured.
Referring to fig. 2, a second embodiment of the present invention discloses a power adjustment method of a hydraulic pump, comprising:
acquiring flow feedback data acquired through a first flow meter 15 and a second flow meter arranged at a rod cavity interface and a rodless cavity interface of an execution cylinder 16;
acquiring pressure feedback data acquired by a first pressure sensor 12 and a second pressure sensor 11 arranged at a first output end and a second output end of a pilot valve 13;
judging whether the system in the constant power operation mode needs to release power or not according to the pressure feedback data and the flow feedback data;
if so, generating a control signal to the electric proportional relief valve 7, so that the electric proportional relief valve 7 acts on the hydraulic ejector pin of the constant power valve 5, and further improving the displacement of the scalar pump.
Preferably, the system in the constant power operation mode is judged whether to need power release according to the pressure feedback data and the flow feedback data; the method comprises the following steps:
when the feedback data increases according to the pressure data and the flow feedback data decreases, the system in the constant power operation mode is defined to need to release power.
According to the power regulating system and the power regulating method for the hydraulic pump, the driving motor 2 drives the variable-power hydraulic mechanism to operate, oil is supplied to the executing mechanism through the oil guide loop, the controller 10 collects pressure feedback data and flow feedback data of the executing mechanism through the detecting unit, and when the system of the executing mechanism in a constant-power operation mode is judged to be required to release power, a control signal is generated to the variable-power hydraulic mechanism, so that the variable-power hydraulic mechanism is enabled to release power, and the problem that an actuator loop overflows from a pressure cut-off valve and cannot execute actions when the actuator in the prior art encounters an excessive load working condition is solved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention.
Claims (9)
1. A power conditioning system of a hydraulic pump, comprising: the device comprises a controller, a driving motor, a variable-power hydraulic mechanism, an oil guide loop, a detection unit and an execution mechanism;
the output end of the controller is electrically connected with the control end of the variable power hydraulic mechanism, and the output shaft of the driving motor is connected with the variable power hydraulic mechanism;
the variable-power hydraulic mechanism is connected with the executing mechanism through the oil guide loop, and the detecting unit is configured on the executing mechanism;
the detection unit is configured to collect pressure information and flow information of the execution mechanism, and the controller is configured to judge that the variable-power hydraulic mechanism is in a constant power interval according to the pressure information and the flow information and provide output power of the variable-power hydraulic mechanism when an operator needs to enter a power release state stage;
the variable power hydraulic mechanism includes: the system comprises a variable pump, a pilot constant displacement pump, a variable mechanism, a constant power valve, an electric proportional overflow valve and a valve assembly;
the variable pump is connected with the driving motor through a spline shaft, the pilot constant delivery pump is coaxially connected with the variable pump, the input ends of the variable pump and the pilot constant delivery pump are used for being connected with an oil tank, and the pilot constant delivery pump is connected with the electric proportional overflow valve and the executing mechanism through the valve assembly; the variable pump, the variable mechanism and the constant power valve are connected with the oil guide loop; the electric proportional overflow valve is connected with the constant power valve, the constant power valve is connected with the variable mechanism, and the variable mechanism is connected with the variable pump;
the control end of the electric proportional relief valve and the output end of the controller are configured to receive signals of the controller and adjust the valve core position of the constant-power valve;
the variable mechanism is configured to adjust the variable pump according to a spool position of the constant power valve.
2. The power regulation system of a hydraulic pump of claim 1, wherein the variable displacement mechanism comprises: the first valve core, the left end oil cavity and the right end oil cavity;
the right-end oil cavity is connected with the input end of the oil guide loop, the left-end oil cavity is connected with the j port of the constant power valve, the first valve core is connected with the constant power valve through a loop bar, and the first valve core is connected with the variable pump through a connecting rod.
3. The power conditioning system of a hydraulic pump of claim 1, wherein the valve assembly comprises: a first relief valve and a constant pressure valve;
the input end of the first overflow valve and the input end of the constant pressure valve are connected with the output end of the pilot constant displacement pump, the output end of the first overflow valve is used for being connected with an oil tank, the output end of the constant pressure valve is connected with the t port of the electric proportional overflow valve, and the output end of the constant pressure valve is connected with the executing mechanism.
4. The power regulation system of a hydraulic pump of claim 1, wherein the constant power valve is a three-position three-way valve;
the constant power valve is characterized in that the k end of the constant power valve is connected with the oil tank, the i end and the m end of the constant power valve are connected with the output end of the variable pump, the right end of the constant power valve is provided with a hydraulic thimble and a connecting spring, and the hydraulic thimble is connected with the n port of the electric proportional overflow valve.
5. The power conditioning system of a hydraulic pump of claim 1, wherein the oil routing circuit comprises: a one-way valve and a second overflow valve;
the input end of the one-way valve is connected with the output end of the variable pump, the input end of the second overflow valve is connected with the output end of the variable pump, the output end of the second overflow valve is connected with the oil tank, and the output end of the one-way valve is connected with the input end of the executing mechanism.
6. The power conditioning system of a hydraulic pump of claim 1, wherein the actuator comprises: the hydraulic control system comprises a pilot valve, a three-position six-way valve, an execution oil cylinder, a rod cavity overflow valve and a rodless cavity overflow valve;
the input end of the pilot valve is connected with the output end of the valve assembly, the first output end of the pilot valve is connected with the e end of the three-position six-way valve, the second output end of the pilot valve is connected with the f end of the three-position six-way valve, the t end and the d end of the three-position six-way valve are connected with the oil tank, the output end of the oil guide loop is connected with the p end and the c end of the three-position six-way valve, the a end and the b end of the three-position six-way valve are respectively connected with a rod cavity and a rodless cavity of the execution oil cylinder, and the rod cavity overflow valve and the rodless cavity overflow valve are respectively connected with a rod cavity interface and a rodless cavity interface of the execution oil cylinder.
7. The power conditioning system of a hydraulic pump as recited in claim 6 wherein the sensing unit includes a first flow meter, a second flow meter, a first pressure sensor, and a second pressure sensor electrically connected to the input of the controller;
the first flowmeter and the second flowmeter are respectively arranged at a rod cavity interface and a rodless cavity interface of the execution oil cylinder;
the first pressure sensor and the second pressure sensor are respectively configured at a first output end and a second output end of the pilot valve.
8. A power adjustment method of a hydraulic pump, applied to the power adjustment system of a hydraulic pump according to any one of claims 1 to 7, comprising:
acquiring flow feedback data acquired through a first flow meter and a second flow meter which are arranged at a rod cavity interface and a rodless cavity interface of an execution oil cylinder;
acquiring pressure feedback data acquired by a first pressure sensor and a second pressure sensor arranged at a first output end and a second output end of a pilot valve;
judging whether the system in the constant power operation mode needs to release power or not according to the pressure feedback data and the flow feedback data;
if so, generating a control signal to the electric proportional overflow valve so that the electric proportional overflow valve acts on the hydraulic ejector pin of the constant power valve, and further improving the displacement of the scalar pump.
9. The method for power adjustment of a hydraulic pump according to claim 8, wherein said determining whether the system in the constant power operation mode requires power release based on said pressure feedback data and flow feedback data; the method comprises the following steps:
when the flow feedback data decreases according to the increase of the pressure feedback data, it is defined that the system in the constant power operation mode needs to perform power release.
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