CN116201777A - Multistage variable-frequency control hydraulic power system and control method thereof - Google Patents
Multistage variable-frequency control hydraulic power system and control method thereof Download PDFInfo
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Abstract
The invention discloses a multistage variable frequency control hydraulic power system and a control method thereof, wherein the multistage variable frequency control hydraulic power system comprises a mounting base, a driving module used as a power part of a power system, a hydraulic module used as a hydraulic part of the power system and a valve group module used as a hydraulic control part of the power system, the driving module is positioned at the inner side of the lower part of the mounting base, the hydraulic module is positioned at one side of the driving module, and the valve group module is arranged at the upper part of the mounting base corresponding to the hydraulic module.
Description
Technical Field
The invention relates to the technical field of hydraulic power systems, in particular to a multistage variable frequency control hydraulic power system and a control method thereof.
Background
In the prior art, in the emergency equipment of fire-fighting vehicles, the hydraulic transmission power system has the characteristics of large specific power density, flexible and various control and increasingly larger characteristic proportion, and is more obvious in the novel equipment, and the working characteristic of a hydraulic station serving as a power source is particularly important. The hydraulic station is an independent hydraulic device, provides hydraulic oil with controllable direction, pressure and flow according to the characteristic requirements of equipment vehicles, is suitable for various action mechanisms, and is formed by combining a motor-pump device, an integrated block, a control valve, an oil tank, an electric control device and the like. With the technical progress and the social development, the capability of the forest fire engine is higher and higher, the requirements of the working condition performance on corresponding hydraulic power sources and hydraulic stations are also improved, the hydraulic stations in the existing forest fire engine are all single power sources, and the range of the hydraulic oil discharge capacity provided by the existing forest fire engine is narrow; the pressure adjustment change range is small; or when the pressure and flow use requirements are met, the power loss is serious, and the contradiction and the opposite disadvantages are more obvious in the two aspects of the use range and the energy-saving requirement.
In summary, the hydraulic station in the existing forest fire engine has the following disadvantages: 1. the output rotation speed is single: the power of a common motor is adopted, and the rotating speed is not adjustable; 2. the pressure output range is limited: the pressure output of the hydraulic station is limited by the performance of the pressure regulating valve, the whole pressure can not be regulated in the pressure range, and the requirements of various pressure requirement devices can not be met; 3. the output flow rate has small variation: under the drive of the fixed-rotation-speed motor, the output flow is unchanged when the hydraulic station is a constant-displacement pump, the output flow change range is small when the hydraulic station is a variable-displacement pump, and elements and executing mechanisms with various flow requirements are not matched; 4. the power loss is serious and the efficiency is low when the working under different working conditions is carried out; 5. the output power is single.
The application number is: 202010010567.2 discloses a multistage differential pressure control hydraulic system, and belongs to the technical field of hydraulic pressure. The multistage differential pressure control hydraulic system comprises a power source, a variable pump, a quantitative pump, a hydraulic control handle, a proportional reversing valve, a first shuttle valve, an actuator, a sequence valve, a first hydraulic control reversing valve, a first load sensing control valve, a second hydraulic control reversing valve, a third hydraulic control reversing valve and an oil tank. However, the multistage differential pressure control hydraulic system can only control differential pressure in the working process, so that stable operation of an actuator is ensured, and the technical problems cannot be solved.
Disclosure of Invention
The invention aims to provide a multistage variable frequency control hydraulic power system and a control method thereof.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the utility model provides a multistage variable frequency control hydraulic power system, includes the mounting base, the mounting base erects subaerial, still includes the drive module that is used for as driving system power part, is used for as the hydraulic module of driving system hydraulic pressure part and is used for as the valves module of driving system hydraulic pressure control part, and drive module is located the lower part inboard of mounting base, hydraulic module is located one side of drive module, and the valves module corresponds the hydraulic module configuration and is in the upper portion of mounting base.
The driving module comprises a secondary motor and a mechanical gearbox, wherein the secondary motor is arranged on the inner side of the lower portion of the mounting base and is fixedly connected with the mounting base, the mechanical gearbox corresponds to the secondary motor, the secondary motor is arranged on the inner side of the lower portion of the mounting base and is fixedly connected with the mounting base, and the mechanical gearbox is in transmission connection with the secondary motor through a coupler.
The two-stage motor is a two-output-end two-stage motor, the mechanical gearbox is a three-output-end mechanical gearbox, and one group of output ends of the two-stage motor are in transmission connection with the input end of the mechanical gearbox through a coupler.
The hydraulic module comprises a hydraulic oil tank, an oil return filter and a duplex pump set, wherein the hydraulic oil tank is arranged at the upper end of one side of the installation base and is fixedly connected with the installation base, a pressure oil port and an oil return port are arranged on the hydraulic oil tank, the oil return filter is arranged at the upper end of the hydraulic oil tank and is fixedly connected with the hydraulic oil tank, the oil return filter is communicated with the hydraulic oil tank, and the duplex pump set is configured at one end of the secondary motor far away from the mechanical gearbox.
The duplex pump group comprises a low-pressure pump and a high-pressure pump, the low-pressure pump is arranged at one end of the secondary motor, which is far away from the mechanical gearbox, and is connected with the output end of the secondary motor, the high-pressure pump is arranged at one end of the low-pressure pump, which is far away from the secondary motor, and is connected with the low-pressure pump in series, and the low-pressure pump and the high-pressure pump jointly form the duplex pump group so as to be communicated with the hydraulic oil tank through a pipeline.
The hydraulic oil pump further comprises oil suction filters and temperature detectors, wherein the two groups of the oil suction filters are arranged, the two groups of the oil suction filters are respectively arranged on the low-pressure pump and the high-pressure pump and fixedly connected with the corresponding pump body, and the temperature detectors are arranged in the hydraulic oil tank and fixedly connected with the hydraulic oil tank.
The valve group module comprises an integrated valve group, a pressure sensor, a pressure gauge and a high-pressure flow sensor, wherein the integrated valve group is arranged at the upper end of one side of the installation base and fixedly connected with the installation base, the pressure sensor, the pressure gauge and the high-pressure flow sensor are integrally arranged on the integrated valve group, and the integrated valve group is connected with the low-pressure pump and the high-pressure pump through a hydraulic valve.
The hydraulic valve is characterized by further comprising an electric control unit, wherein the electric control unit is arranged on one side of the installation base and is in split arrangement with the installation base, the electric control unit is electrically connected with the secondary motor and the valve group module, a frequency converter is assembled in the electric control unit and is connected with the duplex pump group through a pipeline, and a control button for controlling the duplex pump group and the working state of the hydraulic valve is arranged on the electric control unit.
The control method of the multistage variable frequency control hydraulic power system adopts the multistage variable frequency control hydraulic power system to carry out the following control process:
a. the test element or the secondary circuit is connected into the hydraulic power system through the pressure oil port and the oil return port;
b. after the hydraulic power system is started, the rotation speed of the secondary motor is controlled to stably run through a frequency converter, YV1 is electrified to work through a YV1 button, the output pressure of the high-pressure pump is controlled to be between 0 and 40Mpa through a pressure regulating valve corresponding to the YV1, and unloading of the high-pressure pump is controlled through a YV1 stop button;
c. after the hydraulic power system is started, the rotation speed of the secondary motor is controlled to stably run through a frequency converter, YV2 is electrified to work through a YV2 button, the output pressure of the low-pressure pump is controlled to be more than or equal to 2.5MPa through a pressure regulating valve corresponding to the YV2, and unloading of the low-pressure pump is controlled through a YV2 stop button;
d. after the hydraulic power system is started, the rotation speed of the secondary motor is controlled to stably run through the frequency converter, the YV3 is electrified to work through the YV3 button, the output pressure of the low-pressure pump is controlled to be more than or equal to 0.5Mpa through the pressure regulating valve corresponding to the YV3, and unloading of the low-pressure pump is controlled through the YV3 stop button.
When multiple power outputs are needed, the low-pressure pump and the high-pressure pump are controlled to unload through the YV1, YV2 and YV3 stop buttons, the secondary motor is started, the secondary motor is far away from the output end of the duplex pump group to drive the mechanical gearbox to work, and the mechanical gearbox can be directly connected with hydraulic pumps with different rotation directions to work through the two output ends of the mechanical gearbox and provide power sources for at least two systems.
The beneficial effects of the invention are as follows:
the hydraulic pump is provided with a driving module, the power part of the hydraulic pump adopts variable frequency control, the stepless speed regulation of 0-3000RPM of output rotating speed can be realized, a mechanical gearbox is provided, the multi-power output can be realized, the hydraulic pump is used as a power source to simultaneously provide power for a plurality of systems, a hydraulic module is connected with a high-pressure small-flow pump in series to form a duplex pump through a low-pressure large-flow pump, the continuous adjustment of the displacement of the hydraulic pump from zero to the maximum displacement can be realized while the power of a motor is reasonably utilized, a valve group module is provided, the pressure adjustment range is large, the three-stage pressure control is adopted, the operation of an electric control system is matched, the output of 0.1-40MPa is continuously adjustable, the various pressure requirements are met, and the reasonable configuration of flow pressure and power is completed;
the control method is accurate in action, quick in response, reliable in control and high in integration degree, the high-pressure pump can regulate the pressure to 40Mpa, the maximum total flow of the system after double-pump confluence can reach 170L/min, the starting of the hydraulic pump is controlled by the frequency converter, the rotating speed of the hydraulic pump can be accurately controlled, so that the change of the flow of the pump is realized, the pressure, the flow and the temperature of the hydraulic system are measured by the special sensors and displayed in real time by the instrument, and the normal operation of the system is ensured.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic diagram of the operation of the present invention.
In the figure: 1. a mounting base; 2. a second-stage motor; 3. a mechanical gearbox; 4. a hydraulic oil tank; 5. a return oil filter; 6. a low pressure pump; 7. a high pressure pump; 8. an oil suction filter; 9. a temperature detector; 10. an integrated valve group; 11. a pressure sensor; 12. a pressure gauge; 13. a high pressure flow sensor; 14. and an electric control unit.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings,
embodiment one:
the invention discloses a multistage variable frequency control hydraulic power system, which comprises a mounting base 1, wherein the mounting base 1 is erected on the ground, and further comprises a driving module used as a power part of a power system, a hydraulic module used as a hydraulic part of the power system and a valve group module used as a hydraulic control part of the power system, wherein the driving module is positioned on the inner side of the lower part of the mounting base 1, the hydraulic module is positioned on one side of the driving module, and the valve group module is correspondingly arranged on the upper part of the mounting base 1.
The driving module comprises a secondary motor 2 and a mechanical gearbox 3, wherein the secondary motor 2 is arranged on the inner side of the lower part of the installation base 1 and is fixedly connected with the installation base 1, the mechanical gearbox 3 is correspondingly arranged on the inner side of the lower part of the installation base 1 and is fixedly connected with the installation base 1, the mechanical gearbox 3 is in transmission connection with the secondary motor 2 through a coupler, the driving module is matched with the mechanical gearbox 3 through the secondary motor 2 to form a power part in a hydraulic power system, the secondary motor 2 is used as the power part in the hydraulic power system, and the mechanical gearbox 3 is used for providing a power source for the system connected with the secondary motor 2 under the action of the secondary motor 2.
The two-stage motor 2 is a two-output-end two-stage motor 2, the mechanical gearbox 3 is a three-output-end mechanical gearbox 3, one group of output ends of the two-stage motor 2 is in transmission connection with the input end of the mechanical gearbox 3 through a coupler, the two-output-end two-stage motor 2 adopts variable frequency control, stepless speed regulation is achieved within a rotating speed range, flow output in various ranges is met, the displacement of a power system can be accurately controlled, one group of output ends of the two-stage motor 2 drives a duplex pump group, a power source is provided for a hydraulic element test and a secondary circuit, the other group of output ends of the two-stage motor 2 is provided with the mechanical gearbox 3, multiple power output is achieved, the three-output-end mechanical gearbox 3 is a positive and negative mechanical gearbox 3, hydraulic pumps with different rotation directions can be driven to provide power sources for different systems, other working devices can be driven, and multiple power output can be achieved.
The hydraulic module comprises a hydraulic oil tank 4, an oil return filter 5 and a duplex pump set, wherein the hydraulic oil tank 4 is arranged at the upper end of one side of the installation base 1 and is fixedly connected with the installation base 1, a pressure oil port and an oil return port are formed in the hydraulic oil tank 4, the oil return filter 5 is arranged at the upper end of the hydraulic oil tank 4 and is fixedly connected with the hydraulic oil tank 4, the oil return filter 5 is communicated with the hydraulic oil tank 4, the duplex pump set is arranged at one end, far away from the mechanical gearbox 3, of the secondary motor 2, the hydraulic module is matched with the duplex pump set through the hydraulic oil tank 4, the oil return filter 5 and the duplex pump set to form a hydraulic part in a hydraulic power system, so that a power source is provided for a test element or a secondary circuit, the hydraulic oil tank 4 is used for accommodating hydraulic oil, the oil return filter 5 is used for filtering impurities in the hydraulic oil entering the hydraulic oil tank 4, the precision of the configuration oil return filter 5 is 10um, cleaning of the hydraulic system is guaranteed, and the duplex pump set is used for providing a plurality of adjustable pressure levels for a vehicle.
The double pump set comprises a low-pressure pump 6 and a high-pressure pump 7, wherein the low-pressure pump 6 is arranged at one end of the secondary motor 2, which is far away from the mechanical gearbox 3, and is connected with the output end of the secondary motor 2, the high-pressure pump 7 is arranged at one end of the low-pressure pump 6, which is far away from the secondary motor 2, and is connected in series with the low-pressure pump 6, the low-pressure pump 6 and the high-pressure pump 7 together form a double pump set to be communicated with the hydraulic oil tank 4 through a pipeline, the double pump set is matched with the low-pressure pump 6 and the high-pressure pump 7 to provide a plurality of adjustable pressure grades for a vehicle, the low-pressure pump 6 is a low-pressure high-flow pump, the high-pressure high-flow pump 7 is a high-pressure low-flow pump, the low-pressure high-flow pump and the high-pressure low-flow pump are integrated into a whole to meet the pressure regulation requirement, and the rotation speed of the secondary motor 2 can be controlled in a combined way as required when the use pressure is low, and the oil supply of the double pumps can be combined as required; when the working condition is high pressure and low flow, the low pressure pump 6 is unloaded, the high pressure pump 7 works independently, the power of the secondary motor 2 is reasonably utilized, the low pressure pump 6 and the high pressure pump 7 work in a reverse flow type oil absorption mode, oil absorption is sufficient, the high pressure pump 7 can regulate pressure to 40Mpa, and the maximum total flow of the system after double pump confluence can reach 170L/min.
Still include oil absorption oil filter 8 and temperature detector 9, oil absorption oil filter 8 is equipped with two sets of, and two sets of oil absorption oil filters 8 set up respectively on low pressure pump 6 and high pressure pump 7 and with the pump body fixed connection who corresponds, temperature detector 9 set up in the inside of hydraulic tank 4 and with hydraulic tank 4 fixed connection, wherein, oil absorption oil filter 8 is arranged in filtering the impurity in the hydraulic oil that gets into the hydraulic pump, temperature detector 9 is arranged in detecting the liquid temperature in the hydraulic tank 4.
The valve group module comprises an integrated valve group 10, a pressure sensor 11, a pressure gauge 12 and a high-pressure flow sensor 13, wherein the integrated valve group 10 is arranged at the upper end of one side of the installation base 1 and fixedly connected with the installation base 1, the pressure sensor 11, the pressure gauge 12 and the high-pressure flow sensor 13 are integrated on the integrated valve group 10, the integrated valve group 10 is connected with the low-pressure pump 6 and the high-pressure pump 7 through hydraulic valves, the valve group module is matched with the integrated valve group 10, the pressure sensor 11, the pressure gauge 12 and the high-pressure flow sensor 13, a user can conveniently adjust and control according to real-time working conditions, the integrated valve group 10 is used for providing installation support for the pressure sensor 11, the pressure gauge 12 and the high-pressure flow sensor 13, the pressure sensor 11 is used for detecting the pressure of a hydraulic power system, the pressure gauge 12 is used for displaying the pressure in real time, and the high-pressure flow sensor 13 is used for detecting the output flow of the hydraulic power system.
The hydraulic control system further comprises an electric control unit 14, the electric control unit 14 is arranged on one side of the installation base 1 and is separately arranged with the installation base 1, the electric control unit 14 is electrically connected with the secondary motor 2 and the valve group module, a frequency converter is assembled in the electric control unit 14 and is connected with the duplex pump set through a pipeline, a control button for controlling the duplex pump set and the working state of the hydraulic valve is arranged on the electric control unit 14, the electric control unit 14 is used as an electric control device in the hydraulic power system, reasonable configuration of flow pressure and power can be completed through cooperation operation of the electric control unit and the electric control unit with the hydraulic power system, the frequency converter is used for controlling the rotating speed of the secondary motor 2, accordingly, the starting of the hydraulic pump is controlled, the rotating speed of the hydraulic pump is controlled through the frequency converter, accordingly, the flow rate of the hydraulic pump is changed, the speed of the variable speed control motor is controlled, and the maximum displacement of the hydraulic pump is continuously adjustable, and the control button is used for controlling the starting, stopping and the hydraulic valve of the hydraulic pump.
The system further comprises a liquid level liquid thermometer and a liquid level controller, wherein the liquid level liquid thermometer and the liquid level controller are arranged on the hydraulic oil tank 4, the liquid level liquid thermometer is used for observing the liquid level position and the liquid temperature, and the liquid level controller is used for controlling the liquid level to realize low-level and high-level alarming and ensuring the normal operation of the system.
Wherein, the hydraulic oil tank 4 reserves two oil return ports and an oil suction port in addition for standby.
Embodiment two:
the control method of the multistage variable frequency control hydraulic power system adopts the multistage variable frequency control hydraulic power system in the first embodiment to carry out the following control process:
a. the test element or the secondary circuit is connected into the hydraulic power system through the pressure oil port and the oil return port;
b. after the hydraulic power system is started, the rotation speed of the secondary motor 2 is controlled to stably run through a frequency converter, the YV1 is electrified to work through a YV1 button, the output pressure of the high-pressure pump 7 is controlled to be between 0 and 40Mpa through a pressure regulating valve corresponding to the YV1, and unloading of the high-pressure pump 7 is controlled through a YV1 stop button;
c. after the hydraulic power system is started, the rotation speed of the secondary motor 2 is controlled to stably run through a frequency converter, YV2 is electrified to work through a YV2 button, the output pressure of the low-pressure pump 6 is controlled to be more than or equal to 2.5MPa through a pressure regulating valve corresponding to the YV2, and the unloading of the low-pressure pump 6 is controlled through a YV2 stop button;
d. after the hydraulic power system is started, the rotation speed of the secondary motor 2 is controlled to stably run through a frequency converter, YV3 is electrified to work through a YV3 button, the output pressure of the low-pressure pump 6 is controlled to be more than or equal to 0.5Mpa through a pressure regulating valve corresponding to the YV3, and the unloading of the low-pressure pump 6 is controlled through a YV3 stop button.
The hydraulic power system adopts three-stage pressure control, can output pressure in different pressure sections, has accurate and controllable output pressure, is continuously adjustable at 0.1-40MPa as a whole, and meets various pressure requirements.
The hydraulic power system can provide hydraulic power sources for secondary circuits with different pressure levels, can achieve an ideal state of actual requirements by controlling the rotating speed of the secondary motor 2 in cooperation with a frequency converter, can be used as a hydraulic test stand, is directly connected with various middle, low and high-pressure hydraulic elements for testing, and is characterized in that pressure, flow and temperature sensors in the hydraulic power system directly measure various parameters, and a secondary instrument directly displays test results.
When multiple power outputs are needed, the low-pressure pump 6 and the high-pressure pump 7 are controlled to be unloaded through the YV1, YV2 and YV3 stop buttons, the secondary motor 2 is started, the secondary motor 2 is far away from the output end of the duplex pump group to drive the mechanical gearbox 3 to work, the mechanical gearbox 3 can be directly connected with hydraulic pumps with different rotation directions to work through the two output ends of the mechanical gearbox 3, and a power source is provided for at least two systems.
Working principle:
the hydraulic power system consists of a driving module, a hydraulic module and a valve group module matched with an electric control unit 14, wherein the power of the secondary motor 2 is controlled by frequency conversion, the output rotating speed can be steplessly regulated, the displacement of the power system can be accurately controlled, the power system is controlled by three-stage pressure, the output pressure can be divided into pressure sections, the output pressure is accurately controllable, the whole pressure is continuously adjustable at 0.1-40MPa, various pressure requirements are met, a duplex pump group formed by connecting a low-pressure large-flow pump in series with a high-pressure small-flow pump is adopted, when the using pressure is lower, the rotating speed of the secondary motor 2 is controlled in a combined way as required, and single-pump oil supply or double-pump confluence oil supply can be realized; when the working condition is high pressure and low flow, the low pressure pump 6 is unloaded, the high pressure pump 7 works independently, the power of the motor is reasonably matched, the two-stage motor 2 adopts a double output end two-stage motor 2, one group of output ends drives a double pump group, a power source is provided for a hydraulic element test and a secondary circuit, the other group of output ends of the two-stage motor 2 is provided with a mechanical gearbox 3, multiple power outputs are realized, the power source is provided for multiple systems, the mechanical gearbox 3 adopts a three-output end mechanical gearbox 3, hydraulic pumps with different rotation directions can be driven to provide power sources for different systems, other working devices can also be driven, the precision of an oil return filter 5 configured by a hydraulic oil tank 4 is 10 microns, and the cleaning of the hydraulic systems is ensured.
The invention has the advantages that the driving module is arranged, the power part of the driving module adopts variable frequency control, the stepless speed regulation of the output rotating speed of 0-3000RPM can be realized, the mechanical gearbox is arranged, the multi-power output can be realized, the driving module is used as a power source to simultaneously provide power for a plurality of systems, the hydraulic module is arranged, the low-pressure large-flow pump is connected in series with the high-pressure small-flow pump to form a duplex pump, the continuous adjustable of the displacement of the hydraulic pump from zero to the maximum displacement can be realized while the motor power is reasonably utilized, the valve group module is arranged, the pressure adjusting range is large, the three-stage pressure control is adopted, the operation of the electric control system is matched, the output of 0.1-40MPa is continuously adjustable, the various pressure requirements are met, and the reasonable configuration of the flow pressure and the power is completed; the control method is accurate in action, quick in response, reliable in control and high in integration degree, the high-pressure pump can regulate the pressure to 40Mpa, the maximum total flow of the system after double-pump confluence can reach 170L/min, the starting of the hydraulic pump is controlled by the frequency converter, the rotating speed of the hydraulic pump can be accurately controlled, so that the change of the flow of the pump is realized, the pressure, the flow and the temperature of the hydraulic system are measured by the special sensors and displayed in real time by the instrument, and the normal operation of the system is ensured.
The foregoing describes one embodiment of the present invention in detail, but the disclosure is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (10)
1. The utility model provides a multistage variable frequency control hydraulic power system, includes mounting base (1), mounting base (1) erect subaerial, its characterized in that still includes the drive module that is used for as driving system power part, is used for as driving system hydraulic pressure part's hydraulic module and is used for as driving system hydraulic pressure control part's valves module, and drive module is located mounting base (1) lower part inboard, hydraulic module is located one side of drive module, and the valves module corresponds the hydraulic module configuration and is in the upper portion of mounting base (1).
2. The multistage variable frequency control hydraulic power system according to claim 1, wherein the driving module comprises a secondary motor (2) and a mechanical gearbox (3), the secondary motor (2) is arranged on the inner side of the lower portion of the mounting base (1) and is fixedly connected with the mounting base (1), the mechanical gearbox (3) is arranged on the inner side of the lower portion of the mounting base (1) corresponding to the secondary motor (2) and is fixedly connected with the mounting base (1), and the mechanical gearbox (3) is in transmission connection with the secondary motor (2) through a coupler.
3. A multistage variable frequency control hydraulic power system according to claim 2, characterized in that the secondary motor (2) is a double-output-end secondary motor (2), the mechanical gearbox (3) is a three-output-end mechanical gearbox (3), and one group of output ends of the secondary motor (2) is in transmission connection with the input end of the mechanical gearbox (3) through a coupling.
4. A multistage variable frequency control hydraulic power system according to claim 3, characterized in that the hydraulic module comprises a hydraulic oil tank (4), an oil return filter (5) and a duplex pump set, wherein the hydraulic oil tank (4) is arranged at the upper end of one side of the mounting base (1) and is fixedly connected with the mounting base (1), a pressure oil port and an oil return port are arranged on the hydraulic oil tank (4), the oil return filter (5) is arranged at the upper end of the hydraulic oil tank (4) and is fixedly connected with the hydraulic oil tank (4), the oil return filter (5) is communicated with the hydraulic oil tank (4), and the duplex pump set is arranged at one end of the secondary motor (2) far away from the mechanical gearbox (3).
5. A multistage variable frequency control hydraulic power system according to claim 4, characterized in that the duplex pump unit comprises a low pressure pump (6) and a high pressure pump (7), the low pressure pump (6) is arranged at one end of the secondary motor (2) far away from the mechanical gearbox (3) and is connected with the output end of the secondary motor (2), the high pressure pump (7) is arranged at one end of the low pressure pump (6) far away from the secondary motor (2) and is connected in series with the low pressure pump (6), and the low pressure pump (6) and the high pressure pump (7) together form the duplex pump unit so as to be communicated with the hydraulic oil tank (4) through a pipeline.
6. The multistage variable frequency control hydraulic power system according to claim 5, further comprising an oil suction filter (8) and a temperature detector (9), wherein the oil suction filter (8) is provided with two groups, the two groups of oil suction filters (8) are respectively arranged on the low-pressure pump (6) and the high-pressure pump (7) and are fixedly connected with corresponding pump bodies, and the temperature detector (9) is arranged in the hydraulic oil tank (4) and is fixedly connected with the hydraulic oil tank (4).
7. The multistage variable frequency control hydraulic power system according to claim 6, wherein the valve block module comprises an integrated valve block (10), a pressure sensor (11), a pressure gauge (12) and a high-pressure flow sensor (13), wherein the integrated valve block (10) is arranged at the upper end of one side of the mounting base (1) and is fixedly connected with the mounting base (1), the pressure sensor (11), the pressure gauge (12) and the high-pressure flow sensor (13) are integrally arranged on the integrated valve block (10), and the integrated valve block (10) is connected with the low-pressure pump (6) and the high-pressure pump (7) through hydraulic valves.
8. The multistage variable frequency control hydraulic power system according to claim 7, further comprising an electric control unit (14), wherein the electric control unit (14) is arranged on one side of the installation base (1) and is separately arranged with the installation base (1), the electric control unit (14) is electrically connected with the secondary motor (2) and the valve group module, a frequency converter is assembled in the electric control unit (14), the frequency converter is connected with the duplex pump group through a pipeline, and a control button for controlling the working state of the duplex pump group and the hydraulic valve is arranged on the electric control unit (14).
9. A control method of a multistage variable frequency control hydraulic power system, characterized in that the multistage variable frequency control hydraulic power system according to claim 8 is adopted for the following control process:
a. the test element or the secondary circuit is connected into the hydraulic power system through the pressure oil port and the oil return port;
b. starting a hydraulic power system, controlling the rotation speed of a secondary motor (2) to stably run through a frequency converter after the system is started, enabling YV1 to work in an electrified mode through a YV1 button, controlling the output pressure of a high-pressure pump (7) to be between 0 and 40Mpa through a pressure regulating valve corresponding to the YV1, and controlling the high-pressure pump (7) to unload through a YV1 stop button;
c. starting a hydraulic power system, controlling the rotation speed of a secondary motor (2) to stably run through a frequency converter after the system is started, enabling YV2 to work in an electrified mode through a YV2 button, controlling the output pressure of a low-pressure pump (6) to be more than or equal to 2.5MPa through a pressure regulating valve corresponding to the YV2, and controlling the low-pressure pump (6) to unload through a YV2 stop button;
d. after the hydraulic power system is started, the rotating speed of the secondary motor (2) is controlled to stably run through the frequency converter, the YV3 is electrified to work through the YV3 button, the output pressure of the low-pressure pump (6) is controlled to be more than or equal to 0.5Mpa through the pressure regulating valve corresponding to the YV3, and the unloading of the low-pressure pump (6) is controlled through the YV3 stop button.
10. The control method of the multistage variable frequency control hydraulic power system according to claim 9, wherein when multiple power outputs are needed, the low-pressure pump (6) and the high-pressure pump (7) are controlled to be unloaded through the YV1, YV2 and YV3 stop buttons, the secondary motor (2) is started, the secondary motor (2) is far away from the output end of the duplex pump group to drive the mechanical gearbox (3) to work, and the mechanical gearbox (3) can be directly connected with hydraulic pumps with different rotation directions to work through the two output ends of the mechanical gearbox and provide power sources for at least two systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310210033.8A CN116201777A (en) | 2023-03-07 | 2023-03-07 | Multistage variable-frequency control hydraulic power system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310210033.8A CN116201777A (en) | 2023-03-07 | 2023-03-07 | Multistage variable-frequency control hydraulic power system and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116201777A true CN116201777A (en) | 2023-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310210033.8A Pending CN116201777A (en) | 2023-03-07 | 2023-03-07 | Multistage variable-frequency control hydraulic power system and control method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN116201777A (en) |
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