CN114518284A - High-power electro-hydraulic control system for compression-shear testing machine - Google Patents

High-power electro-hydraulic control system for compression-shear testing machine Download PDF

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Publication number
CN114518284A
CN114518284A CN202210339937.6A CN202210339937A CN114518284A CN 114518284 A CN114518284 A CN 114518284A CN 202210339937 A CN202210339937 A CN 202210339937A CN 114518284 A CN114518284 A CN 114518284A
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oil port
oil
control valve
unit
motor generator
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CN114518284B (en
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郝云晓
权龙�
李泽鹏
乔舒斐
葛磊
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0025—Shearing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
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  • Health & Medical Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a high-power electro-hydraulic control system for a compression-shear testing machine, which comprises: the system comprises a loading execution total unit, a hydraulic power unit and an electric driving unit; the loading execution total unit drives an upper loading plate and a lower loading plate of the compression-shear testing machine to move in different directions, hydraulic oil is provided for the loading execution total unit through the hydraulic power unit, electric power is provided for the loading execution total unit and the hydraulic power unit through the electric driving unit, and the running speed of the loading execution total unit is controlled. The hydraulic-electric hybrid driving mode is adopted to drive the loading plate to move together, so that the output force of the hydraulic transmission part is reduced, the corresponding size is also reduced, the flow provided by the energy accumulator is reduced, the number of required energy accumulators is reduced, and the braking kinetic energy of the working device is efficiently recovered through the matching of the electric driving unit and the loading execution total unit.

Description

High-power electro-hydraulic control system for compression-shear testing machine
Technical Field
The invention relates to the technical field of compression-shear testing machines, in particular to a high-power electro-hydraulic control system for a compression-shear testing machine.
Background
The compression-shear testing machine is a typical testing machine, plays a role in the performance test of the damping material, and can be used for detecting the compression elastic modulus, the shear aging and the compression strength of the seismic isolation and reduction device. In order to meet the requirement of great output force, in a compression-shear testing machine, a servo valve control cylinder system is usually adopted to drive each actuating mechanism to complete a detection task. In the working process, in order to control the movement of each actuating mechanism, a control valve of a hydraulic system has very large throttling loss; in the process of deceleration and braking of the actuating mechanism, high-capacity kinetic energy of the working device is converted into heat energy through the throttling action of the control valve and dissipated, and great energy waste exists. Meanwhile, in order to meet the requirement of ultra-large flow in the dynamic loading process, a large number of accumulator groups are arranged, so that the whole machine occupies large space and has high cost. Therefore, a new driving system for a compression-shear testing machine is needed to reduce the demand of the energy accumulator and efficiently recover the braking kinetic energy of the working device on the premise of meeting the motion control characteristics.
Disclosure of Invention
The invention aims to provide a high-power electro-hydraulic control system for a compression-shear testing machine, which can reduce the demand of an energy accumulator and efficiently recover the braking kinetic energy of a working device.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a high-power electro-hydraulic control system for a compression-shear testing machine, wherein the compression-shear testing machine comprises an upright post, a cross beam, an upper loading plate and a lower loading plate, and the high-power electro-hydraulic control system comprises: the system comprises a loading execution total unit, a hydraulic power unit and an electric driving unit;
the loading execution total unit is used for driving an upper loading plate and a lower loading plate of the compression and shear testing machine to move in different directions;
the hydraulic power unit is connected with the loading execution main unit and used for providing hydraulic oil for the loading execution main unit;
and the electric driving unit is respectively connected with the loading execution total unit and the hydraulic power unit, and is used for providing electric power for the loading execution total unit and the hydraulic power unit and controlling the running speed of the loading execution total unit.
Optionally, the hydraulic power unit comprises: the system comprises a motor, a hydraulic pump, a one-way valve, an overflow valve, a first oil tank, a switch valve and an energy accumulator group;
the motor is coaxially connected with the hydraulic pump, an oil inlet of the hydraulic pump is connected with the first oil tank, an oil outlet of the hydraulic pump is respectively connected with an oil port P0 of the one-way valve and an oil inlet of the overflow valve, an oil port A0 of the one-way valve is communicated with an oil port P1 of the switch valve, and the energy accumulator group is communicated with an oil port A1 of the switch valve; the hydraulic pump and the accumulator group jointly provide hydraulic oil for the loading execution total unit;
when the lower loading plate is statically loaded, the switch valve is in the right position, and oil required by the loading execution total unit is independently provided by a hydraulic pump;
when the lower loading plate is loaded dynamically, the switch valve is in a left position, and the accumulator group supplies hydraulic oil to the loading execution main unit together with the hydraulic pump through the oil port A1 and the oil port P1.
Optionally, the load execution total unit includes: the system comprises at least one first vertical loading execution unit, at least one second vertical loading execution unit, at least one third vertical loading execution unit, at least one left loading execution unit, at least one right loading execution unit and at least one rear loading execution unit;
each first vertical loading execution unit is respectively connected with the beam and the upper loading plate, each second vertical loading execution unit is connected with the lower loading plate, each third vertical loading execution unit is connected with the lower loading plate, each left loading execution unit is connected with the lower loading plate, each right loading execution unit is connected with the lower loading plate, and each rear loading execution unit is connected with the lower loading plate;
each first vertical loading execution unit is used for driving an upper loading plate to vertically move, each second vertical loading execution unit and each third vertical loading execution unit are used for jointly driving a lower loading plate to vertically move, each left loading execution unit and each right loading execution unit are used for jointly driving the lower loading plate to horizontally move left and right, and each rear loading execution unit is used for driving the lower loading plate to horizontally move front and back.
Optionally, the electric drive unit comprises: the system comprises a direct-current bus, a first inverter, a second inverter, a third inverter, a fourth inverter, a fifth inverter, a sixth inverter and a seventh inverter;
the first inverter is respectively connected with the direct-current bus and the right loading execution unit, the second inverter is respectively connected with the direct-current bus and the first vertical loading execution unit, the third inverter is respectively connected with the direct-current bus and the motor of the hydraulic power unit, the fourth inverter is respectively connected with the direct-current bus and the rear loading execution unit, the fifth inverter is respectively connected with the direct-current bus and the third vertical loading execution unit, the sixth inverter is respectively connected with the direct-current bus and the second vertical loading execution unit, and the seventh inverter is respectively connected with the direct-current bus and the left loading execution unit.
Optionally, the electric drive unit further comprises: a DC-DC converter and a super capacitor bank;
the DC-DC converter is connected with the direct current bus, and the super capacitor bank is connected with the DC-DC converter;
when the upper loading plate descends, a first motor generator in the first vertical loading execution unit is in a power generation working condition, and generated electric energy is stored in the super capacitor bank through the second inverter, the direct-current bus and the DC-DC converter;
when the upper loading plate rises, a first motor generator in the first vertical loading execution unit is in a motor-driven working condition, and the electric energy stored by the super capacitor bank provides power for the first motor generator in the first vertical loading execution unit through the DC-DC converter, the DC bus and the second inverter;
when the lower loading plate horizontally moves left and right to decelerate, a fifth motor generator in the right loading execution unit is in a power generation working condition, and generated electric energy is stored in the super capacitor bank through the first inverter, the direct current bus and the DC-DC converter; a fourth motor generator in the left loading execution unit is in a power generation working condition, and generated electric energy is stored in the super capacitor bank through the seventh inverter, the direct current bus and the DC-DC converter;
when the lower loading plate moves horizontally left and right to accelerate, a fifth motor generator in the right loading execution unit is in an electric working condition, and the electric energy stored in the super capacitor bank provides power for the fifth motor generator in the right loading execution unit through the DC-DC converter, the direct current bus and the first inverter; and the fourth motor generator in the left loading execution unit is in a power generation working condition, and the electric energy stored in the super capacitor bank provides power for the fourth motor generator in the left loading execution unit through the DC-DC converter, the direct current bus and the seventh inverter.
Optionally, the first vertical load execution unit includes: the device comprises a first motor generator, a first speed reducer, a first screw transmission pair, a first push rod, a first control valve, a first containing cavity and a second containing cavity;
the first motor generator is connected with the electric drive unit, the first speed reducer is connected with the first motor generator, the first screw transmission pair is connected with the first speed reducer, and the first push rod is connected with the speed reducer through the screw transmission pair;
the first motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the first push rod through the first speed reducer and the first spiral transmission pair in sequence so as to drive the upper loading plate to move up and down;
an oil port A2 of the first control valve is connected with the first cavity, an oil port B2 of the first control valve is connected with the second cavity, an oil port P2 of the first control valve is connected with the hydraulic power unit, and an oil port T2 of the first control valve is connected with the second oil tank;
when the upper loading plate descends, the first control valve works at the left position, an oil port B2 of the first control valve is communicated with an oil port P2, an oil port A2 is communicated with an oil port T2, oil liquid of the hydraulic pump flows into the second cavity, and the oil liquid in the first cavity flows into a second oil tank through an oil port T2; the first motor generator controls the lowering speed of the upper load plate 33;
when the upper loading plate rises, the first control valve works at the right position, an oil port A2 of the first control valve is communicated with an oil port P2, an oil port B2 of the first control valve is communicated with an oil port T2, oil liquid of the hydraulic pump flows into the first cavity, and the oil liquid in the second cavity flows into a second oil tank through an oil port T2; the first motor generator controls the rising speed of the upper load plate.
Optionally, the second vertical load execution unit includes: the second motor generator, the second speed reducer, the second screw transmission pair, the second push rod, the second control valve, the third cavity and the fourth cavity; the third vertical load execution unit includes: the third motor generator, the third speed reducer, the third screw transmission pair, the third push rod, the third control valve, the fifth containing cavity and the sixth containing cavity;
the second motor generator is connected with the electric driving unit, the second speed reducer is connected with the second motor generator, the second screw transmission pair is connected with the second speed reducer, and the second push rod is connected with the second speed reducer through the second screw transmission pair; the third motor generator is connected with the electric drive unit, the third speed reducer is connected with the third motor generator, the third screw transmission pair is connected with the third speed reducer, and the third push rod is connected with the third speed reducer through the third screw transmission pair;
the second motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the second push rod sequentially through the second speed reducer and the second spiral transmission pair, and the third motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the third push rod sequentially through the third speed reducer and the third spiral transmission pair so as to jointly drive the lower loading plate to move up and down;
an oil port A5 of the second control valve is connected with the third cavity, an oil port B5 of the second control valve is connected with the fourth cavity, an oil port P5 of the second control valve is connected with the hydraulic power unit, and an oil port T5 of the second control valve is connected with a third oil tank;
an oil port A4 of the third control valve is connected with a fifth cavity, an oil port B4 of the third control valve is connected with a sixth cavity, an oil port P4 of the third control valve is connected with a hydraulic power unit, and an oil port T4 of the third control valve is connected with a fourth oil tank 6;
when the lower loading plate descends, the second control valve works at the right position, an oil port A5 of the second control valve is communicated with an oil port P5, an oil port B5 is communicated with an oil port T5, oil liquid of the hydraulic pump flows into the third cavity, and oil liquid in the fourth cavity flows into the third oil tank through an oil port T5; the third control valve works in the right position, an oil port A4 of the third control valve is communicated with an oil port P4, an oil port B4 is communicated with an oil port T4, oil of the hydraulic pump flows into the fifth cavity, and the oil in the sixth cavity flows into a fourth oil tank through an oil port T4; the second motor generator and the third motor generator jointly control the descending speed of the lower loading plate;
when the lower loading plate ascends, the second control valve works at the left position, an oil port B5 of the second control valve is communicated with an oil port P5, an oil port A5 of the second control valve is communicated with an oil port T5, oil liquid of the hydraulic pump flows into the fourth cavity, and the oil liquid in the third cavity flows into a third oil tank through an oil port T5; the third control valve works in a left position, an oil port B4 of the third control valve is communicated with an oil port P4, an oil port A4 is communicated with an oil port T4, oil liquid of the hydraulic pump flows into the sixth cavity, and the oil liquid in the fifth cavity flows into a fourth oil tank through an oil port T4; the second motor generator and the third motor generator jointly control the ascending speed of the lower loading plate.
Optionally, the left load execution unit includes: the fourth motor generator, the fourth speed reducer, the fourth screw transmission pair, the fourth push rod, the fourth control valve, the seventh cavity and the eighth cavity; the right load execution unit includes: the first helical transmission pair is arranged on the first motor generator, and the first helical transmission pair is arranged on the first push rod;
the fourth motor generator is connected with the electric drive unit, the fourth speed reducer is connected with the fourth motor generator, the fourth screw transmission pair is connected with the fourth speed reducer, and the fourth push rod is connected with the fourth speed reducer through the fourth screw transmission pair; the fifth motor generator is connected with the electric drive unit, the fifth speed reducer is connected with the fifth motor generator, the fifth screw transmission pair is connected with the fifth speed reducer, and the fifth push rod is connected with the fifth speed reducer through the fifth screw transmission pair;
the fourth motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the fourth push rod sequentially through the fourth speed reducer and the fourth screw transmission pair, and the fifth motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the fifth push rod sequentially through the fifth speed reducer and the fifth screw transmission pair so as to drive the lower loading plate to move left and right together;
an oil port A6 of the fourth control valve is connected with a seventh cavity, an oil port B6 of the fourth control valve is connected with an eighth cavity, an oil port P6 of the fourth control valve is connected with a hydraulic power unit, and an oil port T6 of the fourth control valve is connected with a fifth oil tank;
an oil port A3 of the fifth control valve is connected with a ninth cavity, an oil port B3 of the fifth control valve is connected with a tenth cavity, an oil port P3 of the fifth control valve is connected with a hydraulic power unit, and an oil port T3 of the fifth control valve is connected with a sixth oil tank;
when the lower loading plate moves leftwards, the fourth control valve works at the left position, an oil port B6 of the fourth control valve is communicated with an oil port P6, an oil port A6 of the fourth control valve is communicated with an oil port T6, oil of the hydraulic pump flows into the seventh cavity, and oil in the eighth cavity flows into a fifth oil tank through an oil port T6; the fifth control valve works at the right position, an oil port B3 of the fifth control valve is communicated with an oil port P3, an oil port A3 is communicated with an oil port T3, oil liquid of the hydraulic pump flows into the tenth cavity, and the oil liquid in the ninth cavity flows into a sixth oil tank through an oil port T3; the fourth motor generator and the fifth motor generator jointly control the speed of the lower loading plate moving leftwards;
when the lower loading plate moves rightwards, the fourth control valve works at the right position, an oil port A6 of the fourth control valve is communicated with an oil port P6, an oil port B6 is communicated with an oil port T6, oil liquid of the hydraulic pump flows into the eighth cavity, and the oil liquid in the seventh cavity flows into a fifth oil tank through an oil port T6; the fifth control valve works in a left position, an oil port A3 of the fifth control valve is communicated with an oil port P3, an oil port B3 is communicated with an oil port T3, oil of the hydraulic pump flows into the ninth cavity, and the oil in the tenth cavity flows into a sixth oil tank through an oil port T3; the fourth motor generator and the fifth motor generator jointly control the speed of the lower loading plate moving rightwards.
Optionally, the post-load execution unit includes: the first helical transmission pair is arranged on the first motor generator, and the first helical transmission pair is arranged on the first push rod;
the sixth motor generator is connected with the electric drive unit, the sixth speed reducer is connected with the sixth motor generator, the sixth screw transmission pair is connected with the sixth speed reducer, and the sixth push rod is connected with the sixth speed reducer through the screw transmission pair;
the sixth motor generator is driven by the electric driving unit to convert the rotary motion into the linear motion of the sixth push rod through the sixth speed reducer and the sixth screw transmission pair in sequence so as to drive the lower loading plate to move back and forth;
an oil port A7 of the sixth control valve is connected with an eleventh cavity, an oil port B7 of the sixth control valve is connected with a twelfth cavity, an oil port P7 of the sixth control valve is connected with a hydraulic power unit, and an oil port T7 of the sixth control valve is connected with a seventh oil tank;
when the lower loading plate moves forwards, the sixth control valve works in the upper position, an oil port B7 of the sixth control valve is communicated with an oil port P7, an oil port A7 of the sixth control valve is communicated with an oil port T7, oil liquid of the hydraulic pump flows into the twelfth cavity, and the oil liquid in the eleventh cavity flows into a seventh oil tank through an oil port T3; the sixth motor generator controls the forward moving speed of the lower loading plate;
when the lower loading plate moves backwards, the sixth control valve works in the lower position, the oil port a7 of the sixth control valve is communicated with the oil port P7, the oil port B7 of the sixth control valve is communicated with the oil port T7, oil of the hydraulic pump flows into the eleventh cavity, and the twelfth cavity flows into a seventh oil tank through the oil port T3; the sixth motor generator controls the speed at which the lower load plate moves rearward.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a high-power electro-hydraulic control system for a compression-shear testing machine, which comprises: the system comprises a loading execution total unit, a hydraulic power unit and an electric driving unit; the loading execution total unit drives an upper loading plate and a lower loading plate of the compression-shear testing machine to move in different directions, hydraulic oil is provided for the loading execution total unit through the hydraulic power unit, electric power is provided for the loading execution total unit and the hydraulic power unit through the electric driving unit, and the running speed of the loading execution total unit is controlled. The hydraulic-electric hybrid driving mode is adopted to drive the loading plate to move together, so that the output force of the hydraulic transmission part is reduced, the corresponding size is also reduced, the flow provided by the energy accumulator is reduced, the number of required energy accumulators is reduced, and the braking kinetic energy of the working device is efficiently recovered through the matching of the electric driving unit and the loading execution total unit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a high-power electro-hydraulic control system for a compression-shear testing machine according to the present invention;
FIG. 2 is a schematic diagram illustrating the structure and location of a post-load execution unit according to the present invention;
FIG. 3 is a block diagram of a first vertical load execution unit in accordance with one embodiment of the present invention;
FIG. 4 is a block diagram of a first vertical load execution unit in accordance with another embodiment of the present invention.
Description of the symbols:
the device comprises a load execution general unit-1, a first vertical load execution unit-11, a first motor generator-111, a first speed reducer-112, a first screw transmission pair-113, a first push rod-114, a first control valve-115, a second control valve-125, a third control valve-135, a fourth control valve-145, a fifth control valve-155, a first containing cavity-116, a second containing cavity-117, an electric cylinder-118, a hydraulic cylinder-119, a nut push rod-1110 and a piston rod-1111; a second vertical loading execution unit-12, a third vertical loading execution unit-13, a left loading execution unit-14, a right loading execution unit-15 and a back loading execution unit-16; the hydraulic power unit-2, the motor-21, the hydraulic pump-22, the one-way valve-23, the overflow valve-24, the first oil tank-25, the switch valve-26 and the accumulator group-27; an electric drive unit-3, a direct current bus-31, a first inverter-32, a second inverter-33, a third inverter-34, a fourth inverter-35, a fifth inverter-36, a sixth inverter-37, a seventh inverter-38, a DC-DC converter-39, a super capacitor bank-310, and a rectifier-311; an upper loading plate-4, a lower loading plate-5, a column-6 and a beam-7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a high-power electro-hydraulic control system for a compression-shear testing machine, which can reduce the demand of an energy accumulator and efficiently recover the braking kinetic energy of a working device.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a high power electro-hydraulic control system for a compression-shear testing machine, comprising: a load execution overall unit 1, a hydraulic power unit 2 and an electric drive unit 3. The compression-shear testing machine comprises an upper loading plate 4, a lower loading plate 5, a stand column 6 and a cross beam 7.
And the loading execution total unit 1 is used for driving an upper loading plate 4 and a lower loading plate 5 of the compression and shear testing machine to move in different directions.
And the hydraulic power unit 2 is connected with the loading execution total unit 1 and is used for providing hydraulic oil for the loading execution total unit 1.
And the electric driving unit 3 is respectively connected with the load execution total unit 1 and the hydraulic power unit 2, and is used for providing electric power for the load execution total unit 1 and the hydraulic power unit 2 and controlling the running speed of the load execution total unit 1.
Specifically, the hydraulic power unit includes: the hydraulic pump 22, the relief valve 24, the first oil tank 25, the on-off valve 26, and the accumulator group 27.
The motor 21 is coaxially connected with the hydraulic pump 22, an oil inlet of the hydraulic pump 22 is connected with the first oil tank 25, an oil outlet of the hydraulic pump 22 is respectively connected with an oil port P0 of the check valve 23 and an oil inlet of the overflow valve 24, an oil port a0 of the check valve 23 is communicated with an oil port P1 of the switch valve 26, and the accumulator group 27 is communicated with an oil port a1 of the switch valve 26; the hydraulic pump 22 and the accumulator group 27 together provide the load execution overall unit 1 with hydraulic oil.
When the lower loading plate 5 is statically loaded, the switch valve is at the right position 26, and oil required by the loading execution total unit 1 is separately provided by a hydraulic pump 22; at this time, the moving speed of the lower load plate 4 is low, and the hydraulic pump 22 is usually configured according to the static load test requirement, so as to meet the requirement of the micro-motion of the load plate.
When the lower loading plate 5 is dynamically loaded, the switch valve 26 is in the left position, and the accumulator group 27 supplies hydraulic oil to the load execution total unit 1 through the oil port a1 and the oil port P1 together with the hydraulic pump 22. In the dynamic test process, the movement speed of the lower loading plate is fast, the hydraulic output power and the flow in the hydraulic power unit 2 cannot meet the fast loading requirement, and the accumulator group 27 is required to release high-pressure oil to supplement the flow, namely, in the dynamic loading process, almost all the oil loaded to the execution total unit 1 is provided by the accumulator group 27.
Further, as shown in fig. 1 and fig. 2, the load execution total unit 1 includes: at least one first vertical load execution unit 11, at least one second vertical load execution unit 12, at least one third vertical load execution unit 13, at least one left load execution unit 14, at least one right load execution unit 15, and at least one back load execution unit 16. In an embodiment of the present invention, the number of each load execution unit is one. The number of each load execution unit is not limited herein, and may be set according to actual situations.
Each of the first vertical load execution units 11 is respectively connected to the beam 7 and the upper load plate 4, each of the second vertical load execution units 12 is connected to the lower load plate 5, each of the third vertical load execution units 13 is connected to the lower load plate 5, each of the left load execution units 14 is connected to the lower load plate 5, each of the right load execution units 15 is connected to the lower load plate 5, and each of the rear load execution units 16 is connected to the lower load plate 5.
Each first vertical load execution unit 11 is configured to drive the upper load plate 4 to vertically move, each second vertical load execution unit 12 and each third vertical load execution unit 13 are configured to jointly drive the lower load plate 5 to vertically move, each left load execution unit 14 and each right load execution unit 15 are configured to jointly drive the lower load plate 5 to horizontally move left and right, and each rear load execution unit 16 is configured to drive the lower load plate 5 to horizontally move front and back.
Further, the electric drive unit 3 includes: a dc bus 31, a first inverter 32, a second inverter 33, a third inverter 34, a fourth inverter 35, a fifth inverter 36, a sixth inverter 37, and a seventh inverter 38.
The first inverter 32 is connected to the dc bus 31 and the right load execution unit 15, the second inverter 33 is connected to the dc bus 31 and the first vertical load execution unit 11, the third inverter 34 is connected to the dc bus 31 and the motor 21 of the hydraulic power unit 2, the fourth inverter 35 is connected to the dc bus 31 and the rear load execution unit 16, the fifth inverter 36 is connected to the dc bus 31 and the third vertical load execution unit 13, the sixth inverter 37 is connected to the dc bus 31 and the second vertical load execution unit 12, and the seventh inverter 38 is connected to the dc bus 31 and the left load execution unit 14.
Further, the electric drive unit 3 further includes: a DC-DC converter 39 and a super capacitor bank 310.
The DC-DC converter 39 is connected to the DC bus 31, and the supercapacitor pack 310 is connected to the DC-DC converter 39.
Further, the electric drive unit 3 further includes: the rectifier 311 is configured to convert an external ac power into a dc power to stabilize a voltage of the dc bus.
When the upper loading plate 4 descends, the first motor generator 111 in the first vertical loading execution unit 11 is in a power generation condition, and the generated electric energy is stored in the supercapacitor set 310 through the second inverter 33, the direct current bus 31 and the DC-DC converter 39.
When the upper loading plate 4 is raised, the first motor generator 111 in the first vertical load execution unit 11 is in an electric operating condition, and the electric energy stored in the supercapacitor bank 310 provides power for the first motor generator 111 in the first vertical load execution unit 11 through the DC-DC converter 39, the DC bus 31 and the second inverter 33.
When the lower loading plate 5 decelerates in the horizontal movement from left to right, the fifth motor generator in the right loading execution unit 15 is in a power generation condition, and the generated electric energy is stored in the super capacitor bank 310 through the first inverter 32, the DC bus 31 and the DC-DC converter 39; the fourth motor generator in the left load execution unit 14 is in a power generation condition, and the generated electric energy is stored in the super capacitor bank 310 through the seventh inverter 38, the DC bus 31 and the DC-DC converter 39.
When the lower loading plate 5 is accelerated horizontally from side to side, the fifth motor generator in the right loading execution unit 15 is in an electric working condition, and the electric energy stored in the super capacitor bank 310 supplies power to the fifth motor generator in the right loading execution unit 15 through the DC-DC converter 39, the DC bus 31 and the first inverter 32; the fourth motor generator in the left load execution unit 14 is in a power generation condition, and the electric energy stored in the super capacitor bank 310 powers the fourth motor generator in the left load execution unit 14 through the DC-DC converter 39, the DC bus 31 and the seventh inverter 38. Through the process, the electric drive unit 3 realizes efficient recycling of gravitational potential energy of the upper load plate 4 and braking kinetic energy of the lower load plate 5 in the deceleration process.
Specifically, the first vertical load execution unit 11 includes: a first motor generator 111, a first speed reducer 112, a first screw transmission pair 113, a first push rod 114, a first control valve 115, a first chamber 116, and a second chamber 117. Since the specific structures of the load execution units in the present invention are the same, only the structure of the first vertical load execution unit 11 is taken as an example here to give a schematic structural diagram, and the structures of other load execution units are not described one by one here. The first vertical load execution unit 11 is configured as shown in FIG. 3.
The first motor generator 111 is connected to the electric drive unit 3, the first speed reducer 112 is connected to the first motor generator 111, the first screw transmission pair 113 is connected to the first speed reducer 112, and the first push rod 114 is connected to the first speed reducer 112 through the first screw transmission pair 113.
The first motor generator 111, under the driving of the electric driving unit 3, converts the rotational motion into the linear motion of the first push rod 114 through the first speed reducer 112 and the first screw transmission pair 113 in order to drive the upper load plate 4 to move up and down.
An oil port A2 of the first control valve is connected with the first cavity 116, an oil port B2 of the first control valve is connected with the second cavity 117, an oil port P2 of the first control valve is connected with the hydraulic power unit 2, and an oil port T2 of the first control valve is connected with the second oil tank.
When the upper loading plate 4 descends, the first control valve 115 works in the left position, the port B2 of the first control valve 115 is communicated with the port P2, the port a2 is communicated with the port T2, oil of the hydraulic pump 22 flows into the second cavity 117, and oil in the first cavity 116 flows into a second oil tank through the port T2; the first motor generator 111 controls the lowering speed of the upper load plate 4.
When the upper loading plate rises, the first control valve works at the right position, the oil port a2 of the first control valve is communicated with the oil port P2, the oil port B2 is communicated with the oil port T2, oil liquid of the hydraulic pump 22 flows into the first cavity 116, and oil liquid in the second cavity 117 flows into a second oil tank through the oil port T2; the first motor generator 111 controls the rising speed of the upper load plate 4.
Further, each of the load execution units may further include an electric cylinder 118 and a hydraulic cylinder 119, wherein a nut push rod 1110 of the electric cylinder 118 is connected to a piston rod 1111 of the hydraulic cylinder 119, and on this basis, the hydraulic cylinder includes a first cavity 116 and a second cavity 117, and the load execution unit further includes a first motor generator 111, a first speed reducer 112, a first screw transmission pair 113, and a first control valve 115, different from the foregoing embodiment, the nut push rod 1110 of the electric cylinder 118 is connected to the piston rod 1111 of the hydraulic cylinder 119, and the load plate is driven to move by cooperation of the electric cylinder 118 and the hydraulic cylinder 119, and the structural schematic diagram is shown in fig. 4. Specifically, since the structures of the load execution units are the same, only the structure of the first vertical load execution unit is taken as an example here, a schematic structural diagram is given, and the structures of the other load execution units are not described one by one here.
Specifically, the second vertical load execution unit 12 includes: the second motor generator, the second speed reducer, the second screw transmission pair, the second push rod, the second control valve 125, the third cavity and the fourth cavity; the third vertical load execution unit 13 includes: a third motor generator, a third speed reducer, a third screw transmission pair, a third push rod, a third control valve 135, a fifth containing cavity and a sixth containing cavity.
The second motor generator is connected with the electric drive unit 3, the second speed reducer is connected with the second motor generator, the second screw transmission pair is connected with the second speed reducer, and the second push rod is connected with the second speed reducer through the second screw transmission pair; the third motor generator is connected with the electric drive unit 3, the third speed reducer is connected with the third motor generator, the third screw transmission pair is connected with the third speed reducer, and the third push rod is connected with the third speed reducer through the third screw transmission pair.
The second motor generator is driven by the electric drive unit 3 to convert the rotary motion into the linear motion of the second push rod sequentially through the second speed reducer and the second screw transmission pair, and the third motor generator is driven by the electric drive unit 3 to convert the rotary motion into the linear motion of the third push rod sequentially through the third speed reducer and the third screw transmission pair to jointly drive the lower loading plate 5 to move up and down.
An oil port a5 of the second control valve 125 is connected to the third cavity, an oil port B5 of the second control valve 125 is connected to the fourth cavity, an oil port P5 of the second control valve 125 is connected to the hydraulic power unit 2, and an oil port T5 of the second control valve 125 is connected to the third oil tank.
The oil port a4 of the third control valve 135 is connected to the fifth receiving chamber, the oil port B4 of the third control valve 135 is connected to the sixth receiving chamber, the oil port P4 of the third control valve 135 is connected to the hydraulic power unit 2, and the oil port T4 of the third control valve 135 is connected to the fourth oil tank 6.
When the lower loading plate 5 descends, the second control valve 125 operates at the right position, the oil port a5 of the second control valve 125 is communicated with the oil port P5, the oil port B5 is communicated with the oil port T5, oil in the hydraulic pump 22 flows into the third cavity, and oil in the fourth cavity flows into the third oil tank through the oil port T5; the third control valve 135 works in the right position, an oil port a4 of the third control valve 135 is communicated with an oil port P4, an oil port B4 is communicated with an oil port T4, oil in the hydraulic pump 22 flows into the fifth cavity, and oil in the sixth cavity flows into a fourth oil tank through an oil port T4; the second motor generator and the third motor generator control the lowering speed of the lower load plate 5 together.
When the lower loading plate 5 rises, the second control valve 125 works at the left position, the oil port B5 of the second control valve 125 is communicated with the oil port P5, the oil port a5 is communicated with the oil port T5, the oil liquid of the hydraulic pump 22 flows into the fourth cavity, and the oil liquid in the third cavity flows into a third oil tank through the oil port T5; the third control valve 135 works in the left position, an oil port B4 of the third control valve 135 is communicated with an oil port P4, an oil port a4 is communicated with an oil port T4, oil liquid of the hydraulic pump 22 flows into the sixth cavity, and the oil liquid in the fifth cavity flows into a fourth oil tank through an oil port T4; the second motor generator controls the rising speed of the lower load plate 5 in cooperation with the third motor generator.
Further, the left load execution unit 14 includes: a fourth motor generator, a fourth speed reducer, a fourth screw transmission pair, a fourth push rod, a fourth control valve 145, a seventh containing cavity and an eighth containing cavity; the right load execution unit 15 includes: a fifth motor generator, a fifth speed reducer, a fifth screw transmission pair, a fifth push rod, a fifth control valve 155, a ninth containing cavity and a tenth containing cavity.
The fourth motor generator is connected with the electric drive unit 3, the fourth speed reducer is connected with the fourth motor generator, the fourth screw transmission pair is connected with the fourth speed reducer, and the fourth push rod is connected with the fourth speed reducer through the fourth screw transmission pair; the fifth motor generator is connected with the electric drive unit 3, the fifth speed reducer is connected with the fifth motor generator, the fifth screw transmission pair is connected with the fifth speed reducer, and the fifth push rod is connected with the fifth speed reducer through the fifth screw transmission pair.
The fourth motor generator is driven by the electric drive unit 3 to convert the rotary motion into the linear motion of the fourth push rod sequentially through the fourth speed reducer and the fourth screw transmission pair, and the fifth motor generator is driven by the electric drive unit 3 to convert the rotary motion into the linear motion of the fifth push rod sequentially through the fifth speed reducer and the fifth screw transmission pair to jointly drive the lower loading plate 5 to move left and right.
An oil port a6 of the fourth control valve 145 is connected to the seventh cavity, an oil port B6 of the fourth control valve 145 is connected to the eighth cavity, an oil port P6 of the fourth control valve 145 is connected to the hydraulic power unit 2, and an oil port T6 of the fourth control valve 145 is connected to a fifth oil tank.
An oil port a3 of the fifth control valve 155 is connected with the ninth cavity, an oil port B3 of the fifth control valve 155 is connected with the tenth cavity, an oil port P3 of the fifth control valve 155 is connected with the hydraulic power unit 2, and an oil port T3 of the fifth control valve 155 is connected with a sixth oil tank.
When the lower loading plate 5 moves leftward, the fourth control valve 145 operates at the left position, the oil port B6 of the fourth control valve 145 is communicated with the oil port P6, the oil port a6 is communicated with the oil port T6, oil of the hydraulic pump 22 flows into the seventh cavity, and oil in the eighth cavity flows into the fifth oil tank through the oil port T6; the fifth control valve 155 operates at the right position, the oil port B3 of the fifth control valve 155 is communicated with the oil port P3, the oil port A3 is communicated with the oil port T3, the oil liquid of the hydraulic pump 22 flows into the tenth cavity, and the oil liquid in the ninth cavity flows into a sixth oil tank through the oil port T3; the fourth motor generator and the fifth motor generator together control the speed at which the lower load plate 5 moves leftward.
When the lower loading plate 5 moves rightward, the fourth control valve 145 operates at a right position, the oil port a6 of the fourth control valve 145 is communicated with the oil port P6, the oil port B6 is communicated with the oil port T6, oil of the hydraulic pump 22 flows into the eighth cavity, and oil in the seventh cavity 148 flows into a fifth oil tank through the oil port T6; the fifth control valve 155 works in the left position, the oil port a3 of the fifth control valve 155 is communicated with the oil port P3, the oil port B3 is communicated with the oil port T3, the oil liquid of the hydraulic pump 22 flows into the ninth chamber, and the oil liquid in the tenth chamber flows into the sixth oil tank through the oil port T3; the fourth motor generator controls the speed of the lower load plate 5 moving rightward together with the fifth motor generator.
Further, the post-load execution unit 16 includes: the device comprises a sixth motor generator, a sixth speed reducer, a sixth screw transmission pair, a sixth push rod, a sixth control valve, an eleventh containing cavity and a twelfth containing cavity.
The sixth motor generator is connected with the electric drive unit 3, the sixth speed reducer is connected with the sixth motor generator, the sixth screw transmission pair is connected with the sixth speed reducer, and the sixth push rod is connected with the sixth speed reducer through the sixth screw transmission pair.
The sixth motor generator, under the driving of the electric driving unit 3, converts the rotational motion into the linear motion of the sixth push rod through the sixth speed reducer and the sixth screw transmission pair in sequence, so as to drive the lower loading plate 5 to move back and forth.
An oil port A7 of the sixth control valve is connected with an eleventh cavity, an oil port B7 of the sixth control valve is connected with a twelfth cavity, an oil port P7 of the sixth control valve is connected with the hydraulic power unit 2, and an oil port T7 of the sixth control valve is connected with a seventh oil tank.
When the lower loading plate 5 moves forward, the sixth control valve works in the upper position, the oil port B7 of the sixth control valve is communicated with the oil port P7, the oil port a7 is communicated with the oil port T7, oil liquid of the hydraulic pump 22 flows into the twelfth cavity, and oil liquid in the eleventh cavity flows into a seventh oil tank through the oil port T3; the sixth motor generator controls the speed at which the lower load plate 5 moves forward.
When the lower loading plate 5 moves backwards, the sixth control valve works in the lower position, the oil port a7 of the sixth control valve is communicated with the oil port P7, the oil port B7 of the sixth control valve is communicated with the oil port T7, the oil liquid of the hydraulic pump 22 flows into the eleventh cavity, and the twelfth cavity flows into the seventh oil tank through the oil port T3; the sixth motor generator controls the speed at which the lower load plate 5 moves backward.
In the invention, in the movement process of the loading execution main unit, the speed and the position of each push rod are controlled by the motor generator, the hydraulic power unit provides hydraulic energy for the loading execution main unit through each control valve, each control valve can be kept fully opened, and the high-pressure oil provided by the hydraulic power unit is not required to be throttled, so that the throttling loss of the compression shear testing machine system is greatly reduced.
In addition, the execution unit of the traditional compression-shear testing machine is a hydraulic cylinder, the size is usually large, the diameter can reach 1 m, and the required oil flow is large.
In the invention, a liquid-electricity hybrid driving mode is adopted, namely, the electromechanical transmission (motor-ball screw) and the hydraulic transmission jointly output force to drive the loading plate to move. The method is characterized in that a proper proportion of output force of electromechanical transmission and hydraulic transmission is selected, according to the force balance principle, under the condition of the same output force, the output force of a hydraulic transmission part is reduced, the corresponding size is also reduced, and the flow required to be provided by the energy accumulator is also reduced in the dynamic loading process, so that the number of the energy accumulators can be obviously reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.

Claims (9)

1. The utility model provides a high-power electricity liquid control system for compression shear testing machine, compression shear testing machine includes stand, crossbeam, goes up load plate and load plate down, its characterized in that, high-power electricity liquid control system includes: the system comprises a loading execution total unit, a hydraulic power unit and an electric driving unit;
the loading execution total unit is used for driving an upper loading plate and a lower loading plate of the compression and shear testing machine to move in different directions;
the hydraulic power unit is connected with the loading execution main unit and used for providing hydraulic oil for the loading execution main unit;
the electric driving unit is respectively connected with the loading execution main unit and the hydraulic power unit and is used for providing electric power for the loading execution main unit and the hydraulic power unit and controlling the running speed of the loading execution main unit;
when the upper loading plate descends, the electric energy generated by the loading execution total unit is stored in the electric driving unit; when the upper loading plate rises, the electric energy stored by the electric driving unit provides power for the loading execution total unit; when the lower loading plate decelerates in horizontal movement from side to side, the electric energy generated by the loading execution total unit is stored in the electric drive unit; when the lower loading plate moves horizontally left and right and is accelerated, the electric energy stored by the electric driving unit provides power for the loading execution total unit so as to recover the braking kinetic energy of the system.
2. The high power electro-hydraulic control system for a compression-shear tester as claimed in claim 1, wherein the hydraulic power unit comprises: the system comprises a motor, a hydraulic pump, a one-way valve, an overflow valve, a first oil tank, a switch valve and an accumulator set;
the motor is coaxially connected with the hydraulic pump, an oil inlet of the hydraulic pump is connected with the first oil tank, an oil outlet of the hydraulic pump is respectively connected with an oil port P0 of the one-way valve and an oil inlet of the overflow valve, an oil port A0 of the one-way valve is communicated with an oil port P1 of the switch valve, and the energy accumulator group is communicated with an oil port A1 of the switch valve; the hydraulic pump and the accumulator group jointly provide hydraulic oil for the loading execution total unit;
when the lower loading plate is statically loaded, the switch valve is in the right position, and oil required by the loading execution total unit is independently provided by a hydraulic pump;
when the lower loading plate is loaded dynamically, the switch valve is in a left position, and the accumulator group supplies hydraulic oil to the loading execution main unit together with the hydraulic pump through the oil port A1 and the oil port P1.
3. The high power electro-hydraulic control system for a compression-shear tester as claimed in claim 2, wherein the load execution overall unit comprises: the system comprises at least one first vertical loading execution unit, at least one second vertical loading execution unit, at least one third vertical loading execution unit, at least one left loading execution unit, at least one right loading execution unit and at least one rear loading execution unit;
each first vertical loading execution unit is respectively connected with the beam and the upper loading plate, each second vertical loading execution unit is connected with the lower loading plate, each third vertical loading execution unit is connected with the lower loading plate, each left loading execution unit is connected with the lower loading plate, each right loading execution unit is connected with the lower loading plate, and each rear loading execution unit is connected with the lower loading plate;
each first vertical loading execution unit is used for driving an upper loading plate to vertically move, each second vertical loading execution unit and each third vertical loading execution unit are used for jointly driving a lower loading plate to vertically move, each left loading execution unit and each right loading execution unit are used for jointly driving the lower loading plate to horizontally move left and right, and each rear loading execution unit is used for driving the lower loading plate to horizontally move front and back.
4. The high power electro-hydraulic control system for a compression-shear tester as claimed in claim 3, wherein the electrical drive unit comprises: the system comprises a direct-current bus, a first inverter, a second inverter, a third inverter, a fourth inverter, a fifth inverter, a sixth inverter and a seventh inverter;
the first inverter is respectively connected with the direct current bus and the right loading execution unit, the second inverter is respectively connected with the direct current bus and the first vertical loading execution unit, the third inverter is respectively connected with the direct current bus and the motor of the hydraulic power unit, the fourth inverter is respectively connected with the direct current bus and the rear loading execution unit, the fifth inverter is respectively connected with the direct current bus and the third vertical loading execution unit, the sixth inverter is respectively connected with the direct current bus and the second vertical loading execution unit, and the seventh inverter is respectively connected with the direct current bus and the left loading execution unit.
5. The high power electro-hydraulic control system for a compression-shear tester as claimed in claim 4, wherein the electric drive unit further comprises: a DC-DC converter and a super capacitor bank;
the DC-DC converter is connected with the direct current bus, and the super capacitor bank is connected with the DC-DC converter;
the first vertical load execution unit includes: the device comprises a first motor generator, a first speed reducer, a first screw transmission pair, a first push rod, a first control valve, a first containing cavity and a second containing cavity;
the first motor generator is connected with the electric drive unit, the first speed reducer is connected with the first motor generator, the first screw transmission pair is connected with the first speed reducer, and the first push rod is connected with the speed reducer through the screw transmission pair;
the first motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the first push rod through the first speed reducer and the first spiral transmission pair in sequence so as to drive the upper loading plate to move up and down;
the left load execution unit includes: the fourth motor generator, the fourth speed reducer, the fourth screw transmission pair, the fourth push rod, the fourth control valve, the seventh cavity and the eighth cavity; the right load execution unit includes: the first helical transmission pair is arranged on the first motor generator, and the first helical transmission pair is arranged on the first push rod;
the fourth motor generator is connected with the electric drive unit, the fourth speed reducer is connected with the fourth motor generator, the fourth screw transmission pair is connected with the fourth speed reducer, and the fourth push rod is connected with the fourth speed reducer through the fourth screw transmission pair; the fifth motor generator is connected with the electric drive unit, the fifth speed reducer is connected with the fifth motor generator, the fifth screw transmission pair is connected with the fifth speed reducer, and the fifth push rod is connected with the fifth speed reducer through the fifth screw transmission pair;
the fourth motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the fourth push rod sequentially through the fourth speed reducer and the fourth screw transmission pair, and the fifth motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the fifth push rod sequentially through the fifth speed reducer and the fifth screw transmission pair so as to drive the lower loading plate to move left and right together;
when the upper loading plate descends, a first motor generator in the first vertical loading execution unit is in a power generation working condition, and generated electric energy is stored in the super capacitor bank through the second inverter, the direct-current bus and the DC-DC converter;
when the upper loading plate rises, a first motor generator in the first vertical loading execution unit is in a motor-driven working condition, and the electric energy stored by the super capacitor bank provides power for the first motor generator in the first vertical loading execution unit through the DC-DC converter, the DC bus and the second inverter;
when the lower loading plate horizontally moves left and right to decelerate, a fifth motor generator in the right loading execution unit is in a power generation working condition, and generated electric energy is stored in the super capacitor bank through the first inverter, the direct current bus and the DC-DC converter; a fourth motor generator in the left loading execution unit is in a power generation working condition, and generated electric energy is stored in the super capacitor bank through the seventh inverter, the direct current bus and the DC-DC converter;
when the lower loading plate moves horizontally left and right and is accelerated, a fifth motor generator in the right loading execution unit is in an electric working condition, and the electric energy stored by the super capacitor bank provides power for the fifth motor generator in the right loading execution unit through the DC-DC converter, the direct current bus and the first inverter; and the fourth motor generator in the left loading execution unit is in a power generation working condition, and the electric energy stored in the super capacitor bank provides power for the fourth motor generator in the left loading execution unit through the DC-DC converter, the direct current bus and the seventh inverter.
6. The high-power electro-hydraulic control system for the compression-shear testing machine as claimed in claim 5, wherein the oil port A2 of the first control valve is connected with the first cavity, the oil port B2 of the first control valve is connected with the second cavity, the oil port P2 of the first control valve is connected with the hydraulic power unit, and the oil port T2 of the first control valve is connected with the second oil tank;
when the upper loading plate descends, the first control valve works at the left position, an oil port B2 of the first control valve is communicated with an oil port P2, an oil port A2 is communicated with an oil port T2, oil liquid of the hydraulic pump flows into the second cavity, and the oil liquid in the first cavity flows into a second oil tank through an oil port T2; the first motor generator controls the lowering speed of the upper load plate 33;
when the upper loading plate rises, the first control valve works at the right position, an oil port A2 of the first control valve is communicated with an oil port P2, an oil port B2 of the first control valve is communicated with an oil port T2, oil liquid of the hydraulic pump flows into the first cavity, and the oil liquid in the second cavity flows into a second oil tank through an oil port T2; the first motor generator controls the rising speed of the upper load plate.
7. The high power electro-hydraulic control system for a compression-shear test machine of claim 3, wherein the second vertical load execution unit comprises: the second motor generator, the second speed reducer, the second screw transmission pair, the second push rod, the second control valve, the third cavity and the fourth cavity; the third vertical load execution unit includes: the third motor generator, the third speed reducer, the third screw transmission pair, the third push rod, the third control valve, the fifth containing cavity and the sixth containing cavity;
the second motor generator is connected with the electric drive unit, the second speed reducer is connected with the second motor generator, the second screw transmission pair is connected with the second speed reducer, and the second push rod is connected with the second speed reducer through the second screw transmission pair; the third motor generator is connected with the electric drive unit, the third speed reducer is connected with the third motor generator, the third screw transmission pair is connected with the third speed reducer, and the third push rod is connected with the third speed reducer through the third screw transmission pair;
the second motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the second push rod sequentially through the second speed reducer and the second spiral transmission pair, and the third motor generator is driven by the electric driving unit to convert rotary motion into linear motion of the third push rod sequentially through the third speed reducer and the third spiral transmission pair so as to jointly drive the lower loading plate to move up and down;
an oil port A5 of the second control valve is connected with the third cavity, an oil port B5 of the second control valve is connected with the fourth cavity, an oil port P5 of the second control valve is connected with the hydraulic power unit, and an oil port T5 of the second control valve is connected with a third oil tank;
an oil port A4 of the third control valve is connected with a fifth cavity, an oil port B4 of the third control valve is connected with a sixth cavity, an oil port P4 of the third control valve is connected with a hydraulic power unit, and an oil port T4 of the third control valve is connected with a fourth oil tank 6;
when the lower loading plate descends, the second control valve works at the right position, an oil port A5 of the second control valve is communicated with an oil port P5, an oil port B5 is communicated with an oil port T5, oil liquid of the hydraulic pump flows into the third cavity, and oil liquid in the fourth cavity flows into the third oil tank through an oil port T5; the third control valve works in the right position, an oil port A4 of the third control valve is communicated with an oil port P4, an oil port B4 is communicated with an oil port T4, oil of the hydraulic pump flows into the fifth cavity, and the oil in the sixth cavity flows into a fourth oil tank through an oil port T4; the second motor generator and the third motor generator jointly control the descending speed of the lower loading plate;
when the lower loading plate rises, the second control valve works at the left position, an oil port B5 of the second control valve is communicated with an oil port P5, an oil port A5 is communicated with an oil port T5, oil in the hydraulic pump flows into the fourth cavity, and oil in the third cavity flows into a third oil tank through an oil port T5; the third control valve works in a left position, an oil port B4 of the third control valve is communicated with an oil port P4, an oil port A4 is communicated with an oil port T4, oil liquid of the hydraulic pump flows into the sixth cavity, and the oil liquid in the fifth cavity flows into a fourth oil tank through an oil port T4; the second motor generator and the third motor generator jointly control the ascending speed of the lower loading plate.
8. The high-power electro-hydraulic control system for the compression-shear testing machine as claimed in claim 5, wherein an oil port A6 of a fourth control valve is connected with a seventh cavity, an oil port B6 of the fourth control valve is connected with an eighth cavity, an oil port P6 of the fourth control valve is connected with a hydraulic power unit, and an oil port T6 of the fourth control valve is connected with a fifth oil tank;
an oil port A3 of the fifth control valve is connected with a ninth cavity, an oil port B3 of the fifth control valve is connected with a tenth cavity, an oil port P3 of the fifth control valve is connected with a hydraulic power unit, and an oil port T3 of the fifth control valve is connected with a sixth oil tank;
when the lower loading plate moves leftwards, the fourth control valve works at the left position, an oil port B6 of the fourth control valve is communicated with an oil port P6, an oil port A6 of the fourth control valve is communicated with an oil port T6, oil of the hydraulic pump flows into the seventh cavity, and oil in the eighth cavity flows into a fifth oil tank through an oil port T6; the fifth control valve works at the right position, an oil port B3 of the fifth control valve is communicated with an oil port P3, an oil port A3 is communicated with an oil port T3, oil liquid of the hydraulic pump flows into the tenth cavity, and the oil liquid in the ninth cavity flows into a sixth oil tank through an oil port T3; the fourth motor generator and the fifth motor generator jointly control the speed of the lower loading plate moving leftwards;
when the lower loading plate moves rightwards, the fourth control valve works at the right position, an oil port A6 of the fourth control valve is communicated with an oil port P6, an oil port B6 of the fourth control valve is communicated with an oil port T6, oil liquid of the hydraulic pump flows into the eighth cavity, and the oil liquid in the seventh cavity flows into a fifth oil tank through an oil port T6; the fifth control valve works in a left position, an oil port A3 of the fifth control valve is communicated with an oil port P3, an oil port B3 is communicated with an oil port T3, oil of the hydraulic pump flows into the ninth cavity, and the oil in the tenth cavity flows into a sixth oil tank through an oil port T3; the fourth motor generator and the fifth motor generator jointly control the speed of the lower loading plate moving rightwards.
9. The high-power electro-hydraulic control system for the compression-shear testing machine according to claim 3, wherein the back-loading execution unit comprises: the first helical transmission pair is arranged on the first motor generator, and the first helical transmission pair is arranged on the first push rod;
the sixth motor generator is connected with the electric drive unit, the sixth speed reducer is connected with the sixth motor generator, the sixth screw transmission pair is connected with the sixth speed reducer, and the sixth push rod is connected with the sixth speed reducer through the screw transmission pair;
the sixth motor generator is driven by the electric driving unit to convert the rotary motion into the linear motion of the sixth push rod through the sixth speed reducer and the sixth screw transmission pair in sequence so as to drive the lower loading plate to move back and forth;
an oil port A7 of the sixth control valve is connected with an eleventh cavity, an oil port B7 of the sixth control valve is connected with a twelfth cavity, an oil port P7 of the sixth control valve is connected with a hydraulic power unit, and an oil port T7 of the sixth control valve is connected with a seventh oil tank;
when the lower loading plate moves forwards, the sixth control valve works in the upper position, an oil port B7 of the sixth control valve is communicated with an oil port P7, an oil port A7 of the sixth control valve is communicated with an oil port T7, oil liquid of the hydraulic pump flows into the twelfth cavity, and the oil liquid in the eleventh cavity flows into a seventh oil tank through an oil port T3; the sixth motor generator controls the forward moving speed of the lower loading plate;
when the lower loading plate moves backwards, the sixth control valve works in the lower position, the oil port a7 of the sixth control valve is communicated with the oil port P7, the oil port B7 of the sixth control valve is communicated with the oil port T7, oil of the hydraulic pump flows into the eleventh cavity, and the twelfth cavity flows into a seventh oil tank through the oil port T3; the sixth motor generator controls the speed at which the lower load plate moves rearward.
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