CN114518284B - A high-power electro-hydraulic control system for compression shear testing machine - Google Patents

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 main unit, a hydraulic power unit and an electric driving unit; the upper loading plate and the lower loading plate of the compression-shear testing machine are driven to move in different directions by the loading execution total unit, hydraulic oil is provided for the loading execution total unit by the hydraulic power unit, electric power is provided for the loading execution total unit and the hydraulic power unit by 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

A 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 compression-shear testing machines.

Background technique

As a typical testing machine, the compression shear testing machine plays a pivotal role in the performance testing of shock absorption materials, and can be used for the compressive elastic modulus, shear elastic modulus, shear aging resistance and compression resistance of shock isolation devices. Intensity detection. In order to meet the great output force demand, in the compression shear testing machine, the servo valve-controlled cylinder system is usually used to drive each actuator to complete the detection task. During the working process, in order to control the movement of each actuator, the control valve of the hydraulic system has a very large throttling loss; during the deceleration and braking process of the actuator, the large-capacity kinetic energy of the working device is converted into the throttling effect of the control valve. The heat energy is dissipated, and there is a very large energy waste. At the same time, in order to meet the large flow demand during the dynamic loading process, a large number of accumulator groups are equipped, resulting in a large footprint and high cost of the whole machine. Therefore, there is an urgent need for a new drive system of the compression shear testing machine, which can reduce the demand of the accumulator and efficiently recover the braking kinetic energy of the working device on the premise of satisfying the motion control characteristics.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-power electro-hydraulic control system for a compression shear testing machine, which can reduce the demand of the accumulator and efficiently recover the braking kinetic energy of the working device.

For achieving the above object, the present invention provides the following scheme:

The invention provides a high-power electro-hydraulic control system for a compression-shear testing machine, the compression-shear testing machine includes a column, a beam, an upper loading plate and a lower loading plate, and the high-power electro-hydraulic control system includes: loading Executive unit, hydraulic power unit and electric drive unit;

A loading execution unit is used to drive the upper loading plate and the lower loading plate of the compression shear testing machine to move in different directions;

a hydraulic power unit, connected to the overall loading and execution unit, for providing hydraulic oil to the overall loading and execution unit;

The electric drive unit is respectively connected with the loading execution unit and the hydraulic power unit, and is used for providing electric power for the loading execution unit and the hydraulic power unit, and controlling the running speed of the loading execution unit.

Optionally, the hydraulic power unit includes: an electric motor, a hydraulic pump, a one-way valve, a relief valve, a first oil tank, a switch valve and an accumulator group;

The electric motor is coaxially connected to the hydraulic pump, the oil inlet of the hydraulic pump is connected to the first oil tank, and the oil outlet of the hydraulic pump is respectively connected to the oil port P0 of the one-way valve and the The oil inlet of the relief valve is connected, the oil port A0 of the one-way valve is communicated with the oil port P1 of the on-off valve, and the accumulator group is communicated with the oil port A1 of the on-off valve; the hydraulic pump together with the accumulator group to provide hydraulic oil for the overall loading execution unit;

When the lower loading plate is statically loaded, the on-off valve is in the right position, and the oil required by the overall loading execution unit is provided by a hydraulic pump alone;

When the lower loading plate is dynamically loaded, the switch valve is in the left position, and the accumulator group together with the hydraulic pump provides hydraulic oil for the loading execution unit through the oil port A1 and the oil port P1.

Optionally, the overall loading execution unit includes: 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 a right-loading execution unit and at least one post-loading execution unit;

Each of the first vertical loading execution units is connected to the beam and the upper loading plate respectively, each of the second vertical loading execution units is connected to the lower loading plate, and each of the third vertical loading execution units is connected to the lower loading plate. The loading execution units are all connected to the lower loading board, each of the left loading execution units is connected to the lower loading board, and each of the right loading execution units is connected to the lower loading board, and each of the post-loading execution units is connected to the lower loading board. The units are all connected with the lower loading plate;

Each of the first vertical loading execution units is used to drive the upper loading plate to move vertically, and each of the second vertical loading execution units and each of the third vertical loading execution units are used to jointly drive the lower loading plate to move vertically. Each of the left loading execution units and each of the right loading execution units are used to jointly drive the lower loading plate to move horizontally from side to side, and each of the rear loading execution units is used to drive the lower loading plate to move horizontally back and forth.

Optionally, the electric drive unit includes: a DC bus, a first inverter, a second inverter, a third inverter, a fourth inverter, a fifth inverter, a sixth inverter, and the seventh inverter;

The first inverter is respectively connected with the DC bus and the right loading execution unit, the second inverter is respectively connected with the DC bus and the first vertical loading execution unit, the first The three inverters are respectively connected to the DC bus and the motor of the hydraulic power unit, the fourth inverter is respectively connected to the DC bus and the post-loading execution unit, and the fifth inverter is respectively is connected to the DC bus and the third vertical loading execution unit, the sixth inverter is respectively connected to the DC bus and the second vertical loading execution unit, and the seventh inverter is respectively Connected with the DC bus and the left loading execution unit.

Optionally, the electrical drive unit further includes: a DC-DC converter and a super capacitor bank;

the DC-DC converter is connected to the DC bus, and the super capacitor bank is connected to the DC-DC converter;

When the upper loading plate descends, the first motor-generator in the first vertical loading execution unit is in a power generation state, and the generated electric energy is passed through the second inverter, the DC bus and the DC - a DC converter, stored in the supercapacitor bank;

When the upper loading plate rises, the first motor-generator in the first vertical loading execution unit is in an electric working condition, and the electric energy stored by the super capacitor bank passes through the DC-DC converter, the DC a bus bar and a second inverter to provide power for the first motor-generator in the first vertical loading execution unit;

When the left-right horizontal movement of the lower loading plate decelerates, the fifth motor-generator in the right-loading execution unit is in a power generation state, and the generated electric energy is passed through the first inverter, the DC bus and the DC -DC converter, stored in the super capacitor bank; the fourth motor generator in the left loading execution unit is in the power generation condition, and the generated electric energy is passed through the seventh inverter, the DC bus and all The DC-DC converter is stored in the super capacitor bank;

When the left-right horizontal movement of the lower loading plate is accelerated, the 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 passes through the DC-DC converter, the DC The busbar and the first inverter provide power for the fifth motor-generator in the right-loading execution unit; the fourth motor-generator in the left-loading execution unit is in a power generation condition, and the supercapacitor bank stores Electrical energy powers a fourth motor-generator in the left-loaded execution unit via the DC-DC converter, the DC bus, and a seventh inverter.

Optionally, the first vertical loading execution unit includes: a first motor-generator, a first reducer, a first screw transmission pair, a first push rod, a first control valve, a first chamber and a second chamber cavity;

The first motor-generator is connected to the electric drive unit, the first speed reducer is connected to the first motor-generator, the first screw transmission pair is connected to the first speed reducer, and the first speed reducer is connected to the first speed reducer. A push rod is connected with the reducer through the screw transmission pair;

Driven by the electric drive unit, the first motor-generator converts the rotational motion into the linear motion of the first push rod through the first reducer and the first screw transmission pair in turn, so as to drive the The up and down movement of the above loading plate;

The oil port A2 of the first control valve is connected to the first chamber, the oil port B2 of the first control valve is connected to the second chamber, the oil port P2 of the first control valve is connected to the hydraulic power unit, and the first control valve is connected to the hydraulic power unit. The oil port T2 is connected with the second oil tank;

When the upper loading plate is lowered, the first control valve works in the left position, the oil port B2 of the first control valve is connected to the oil port P2, the oil port A2 is connected to the oil port T2, and the oil of the hydraulic pump The oil flows into the second cavity, and the oil in the first cavity flows into the second oil tank through the oil port T2; the first motor generator controls the descending speed of the upper loading plate 33;

When the upper loading plate rises, the first control valve works in the right position, the oil port A2 of the first control valve is connected to the oil port P2, the oil port B2 is connected to the oil port T2, and the hydraulic pump The oil flows into the first cavity, and the oil in the second cavity flows into the second oil tank through the oil port T2; the first motor generator controls the ascending speed of the upper loading plate.

Optionally, the second vertical loading execution unit includes: a second motor generator, a second reducer, a second screw transmission pair, a second push rod, a second control valve, a third chamber and a fourth chamber. a cavity; the third vertical loading execution unit includes: a third motor generator, a third reducer, a third screw transmission pair, a third push rod, a third control valve, a fifth chamber and a sixth chamber;

The second motor-generator is connected to the electric drive unit, the second speed reducer is connected to the second motor-generator, the second screw transmission pair is connected to the second speed reducer, and the first speed reducer is connected to the second speed reducer. The second push rod is connected with the second reducer through the second screw transmission pair; the third motor-generator is connected with the electric drive unit, and the third reducer is connected with the third motor-generator , the third screw transmission pair is connected with the third reducer, and the third push rod is connected with the third reducer through the third screw transmission pair;

Driven by the electric drive unit, the second motor-generator converts the rotational motion into the linear motion of the second push rod through the second reducer and the second screw transmission pair in sequence, and the first Driven by the electric drive unit, the three motor generators sequentially convert the rotational motion into the linear motion of the third push rod through the third reducer and the third screw transmission pair, and jointly drive the lower loading The up and down movement of the board;

The oil port A5 of the second control valve is connected to the third chamber, the oil port B5 of the second control valve is connected to the fourth chamber, the oil port P5 of the second control valve is connected to the hydraulic power unit, and the The oil port T5 of the second control valve is connected to the third oil tank;

The oil port A4 of the third control valve is connected to the fifth chamber, the oil port B4 of the third control valve is connected to the sixth chamber, and the oil port P4 of the third control valve is connected to the hydraulic power unit, The oil port T4 of the third control valve is connected to the fourth oil tank 6;

When the lower loading plate descends, the second control valve works in the right position, the oil port A5 of the second control valve is connected to the oil port P5, the oil port B5 is connected to the oil port T5, and the hydraulic pump The oil flows into the third cavity, and the oil in the fourth cavity flows into the third tank through the oil port T5; the third control valve works in the right position, and the oil in the third control valve Port A4 is communicated with oil port P4, and oil port B4 is communicated with oil port T4. The oil of the hydraulic pump flows into the fifth chamber, and the oil in the sixth chamber flows into the fourth oil tank through the 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 in the left position, the oil port B5 of the second control valve is connected to the oil port P5, the oil port A5 is connected to the oil port T5, and the hydraulic pump The oil flows into the fourth cavity, and the oil in the third cavity flows into the third tank through the oil port T5; the third control valve works in the left position, and the B4 oil port of the third control valve is connected to the oil The port P4 is connected, the oil port A4 is connected with the oil port T4, the oil of the hydraulic pump flows into the sixth cavity, and the oil in the fifth cavity flows into the fourth oil tank through the 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 loading execution unit includes: a fourth motor generator, a fourth speed reducer, a fourth screw transmission pair, a fourth push rod, a fourth control valve, a seventh chamber and an eighth chamber; The right loading execution unit includes: a fifth motor generator, a fifth reducer, a fifth screw transmission pair, a fifth push rod, a fifth control valve, a ninth chamber and a tenth chamber;

The fourth motor-generator is connected to the electric drive unit, the fourth speed reducer is connected to the fourth motor-generator, the fourth screw transmission pair is connected to the fourth speed reducer, and the fourth speed reducer is connected to the fourth speed reducer. The fourth push rod is connected with the fourth reducer through the fourth screw transmission pair; the fifth motor-generator is connected with the electric drive unit, and the fifth reducer is connected with the fifth motor-generator , the fifth screw transmission pair is connected with the fifth reducer, and the fifth push rod is connected with the fifth reducer through the fifth screw transmission pair;

Driven by the electric drive unit, the fourth motor-generator converts the rotational motion into the linear motion of the fourth push rod through the fourth reducer and the fourth screw transmission pair in sequence, and the fourth Driven by the electric drive unit, the five motor generators sequentially convert the rotational motion into the linear motion of the fifth push rod through the fifth reducer and the fifth screw transmission pair, and jointly drive the lower loading left and right movement of the board;

The oil port A6 of the fourth control valve is connected to the seventh chamber, the oil port B6 of the fourth control valve is connected to the eighth chamber, the oil port P6 of the fourth control valve is connected to the hydraulic power unit, and the The oil port T6 of the fourth control valve is connected with the fifth oil tank;

The oil port A3 of the fifth control valve is connected to the ninth chamber, the oil port B3 of the fifth control valve is connected to the tenth chamber, the oil port P3 of the fifth control valve is connected to the hydraulic power unit, and the The oil port T3 of the fifth control valve is connected with the sixth oil tank;

When the lower loading plate moves to the left, the fourth control valve works in the left position, the oil port B6 of the fourth control valve is connected to the oil port P6, the oil port A6 is connected to the oil port T6, and the hydraulic pump The oil flows into the seventh chamber, and the oil in the eighth chamber flows into the fifth tank through the oil port T6; the fifth control valve works in the right position, and the oil port B3 of the fifth control valve is connected to the oil The port P3 is connected, the oil port A3 is connected with the oil port T3, the oil of the hydraulic pump flows into the tenth volume chamber, and the oil in the ninth volume flows into the sixth oil tank through the oil port T3; The four motor-generators and the fifth motor-generator jointly control the leftward movement speed of the lower loading plate;

When the lower loading plate moves to the right, the fourth control valve works in the right position, the oil port A6 of the fourth control valve is communicated with the oil port P6, the oil port B6 is communicated with the oil port T6, and the oil of the hydraulic pump is connected. The oil flows into the eighth chamber, and the oil in the seventh chamber flows into the fifth tank through the oil port T6; the fifth control valve works in the left position, and the oil port A3 of the fifth control valve and the oil port P3 is connected, oil port B3 is connected with oil port T3, the oil of the hydraulic pump flows into the ninth volume, and the oil in the tenth volume flows into the sixth tank through the oil port T3; the fourth The motor-generator together with the fifth motor-generator controls the speed at which the lower loading plate moves to the right.

Optionally, the post-loading execution unit includes: a sixth motor-generator, a sixth reducer, a sixth screw transmission pair, a sixth push rod, a sixth control valve, an eleventh chamber and a twelfth chamber ;

The sixth motor generator is connected to the electric drive unit, the sixth speed reducer is connected to the sixth motor generator, the sixth screw transmission pair is connected to the sixth speed reducer, and the sixth speed reducer is connected to the sixth speed reducer. The six push rods are connected with the sixth reducer through the screw transmission pair;

The sixth motor-generator, driven by the electric drive unit, sequentially converts the rotational motion into the linear motion of the sixth push rod through the sixth reducer and the sixth screw transmission pair, so as to drive the the forward and backward movement of the lower loading plate;

The oil port A7 of the sixth control valve is connected to the eleventh chamber, the oil port B7 of the sixth control valve is connected to the twelfth chamber, and the oil port P7 of the sixth control valve is connected to the hydraulic power unit, The oil port T7 of the sixth control valve is connected to the seventh oil tank;

When the lower loading plate moves forward, the sixth control valve works in the upper position, the oil port B7 of the sixth control valve is connected to the oil port P7, the oil port A7 is connected to the oil port T7, and the oil of the hydraulic pump The liquid flows into the twelfth chamber, and the oil in the eleventh chamber flows into the seventh tank through the oil port T3; the sixth motor-generator controls the forward speed of the lower loading plate;

When the lower loading plate moves backward, the sixth control valve works in the lower position, the oil port A7 of the sixth control valve is connected to the oil port P7, the oil port B7 is connected to the oil port T7, and the oil of the hydraulic pump The liquid flows into the eleventh volume chamber, and the twelfth volume chamber flows into the seventh fuel tank through the oil port T3; the sixth motor generator controls the backward movement speed of the lower loading plate.

According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

The invention provides a high-power electro-hydraulic control system for a compression-shear testing machine. The system includes: a loading execution unit, a hydraulic power unit and an electric drive unit; the upper loading of the compression-shear testing machine is driven by the loading execution unit. The plate and the lower loading plate move in different directions, the hydraulic power unit provides hydraulic oil for the loading execution unit, and the electric drive unit provides electricity for the loading execution unit and the hydraulic power unit, and controls the running speed of the loading execution unit. The hydraulic-electric hybrid drive is used to jointly drive the loading plate to move, so that the output force of the hydraulic transmission part is reduced, and the corresponding size is also reduced, so that the flow provided by the accumulator is reduced, thereby reducing the number of accumulators required, and Through the cooperation of the electric drive unit and the loading execution unit, the braking kinetic energy of the working device is efficiently recovered.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

Fig. 1 is the structure schematic diagram of the high-power electro-hydraulic control system used for the compression shear testing machine of the present invention;

Fig. 2 is the structure and position schematic diagram of the rear loading execution unit of the present invention;

3 is a schematic structural diagram of a first vertical loading execution unit in a specific embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a first vertical loading execution unit in another specific embodiment of the present invention.

Symbol Description:

Loading execution unit-1, first vertical loading execution unit-11, first motor generator-111, first reducer-112, first screw transmission pair-113, first push rod-114, first control Valve-115, Second Control Valve-125, Third Control Valve-135, Fourth Control Valve-145, Fifth Control Valve-155, First Chamber-116, Second Chamber-117, Electric Cylinder-118 , Hydraulic Cylinder-119, Nut Push Rod-1110, Piston Rod-1111; Second Vertical Loading Execution Unit-12, Third Vertical Loading Execution Unit-13, Left Loading Execution Unit-14, Right Loading Execution Unit-15 , post-loading execution unit-16; hydraulic power unit-2, electric motor-21, hydraulic pump-22, check valve-23, relief valve-24, first fuel tank-25, switch valve-26, accumulator group -27; Electric drive unit-3, DC bus-31, first inverter-32, second inverter-33, third inverter-34, fourth inverter-35, fifth inverter inverter-36, sixth inverter-37, seventh inverter-38, DC-DC converter-39, super capacitor bank-310, rectifier-311; upper loading plate-4, lower loading-5, column -6, beam -7.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide a high-power electro-hydraulic control system for a compression-shear testing machine, which can reduce the demand of the accumulator and efficiently recover the braking kinetic energy of the working device.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1 , a high-power electro-hydraulic control system for a compression-shear testing machine according to the present invention includes: a general loading execution unit 1 , a hydraulic power unit 2 and an electric drive unit 3 . The compression shear testing machine includes an upper loading plate 4 , a lower loading 5 , a column 6 and a beam 7 .

The overall loading execution unit 1 is used to drive the upper loading plate 4 and the lower loading plate 5 of the compression shear testing machine to move in different directions.

The hydraulic power unit 2 is connected to the overall loading execution unit 1 and used to provide hydraulic oil for the overall loading execution unit 1 .

The electric drive unit 3 is connected to the overall loading execution unit 1 and the hydraulic power unit 2 respectively, and is used to provide electric power for the overall loading execution unit 1 and the hydraulic power unit 2, and to control the overall loading execution unit 1 and the hydraulic power unit 2. Unit 1 operating speed.

Specifically, the hydraulic power unit includes: an electric motor 21 , a hydraulic pump 22 , a one-way valve 23 , a relief valve 24 , a first oil tank 25 , an on-off valve 26 and an accumulator group 27 .

The electric motor 21 is coaxially connected to the hydraulic pump 22 , the oil inlet of the hydraulic pump 22 is connected to the first oil tank 25 , and the oil outlet of the hydraulic pump 22 is respectively connected to the one-way valve 23 . The oil port P0 is connected to the oil inlet of the relief valve 24, the oil port A0 of the one-way valve 23 is connected to the oil port P1 of the on-off valve 26, and the accumulator group 27 is connected to the on-off valve. The oil port A1 of 26 is connected; the hydraulic pump 22 and the accumulator group 27 together provide hydraulic oil for the loading execution unit 1 .

When the lower loading plate 5 is statically loaded, the switch valve is in the right position of 26, and the oil required by the loading execution unit 1 is provided by the hydraulic pump 22 alone; at this time, the moving speed of the lower loading plate 4 is small, The hydraulic pump 22 is usually configured according to the static loading test requirements, and can meet the loading plate fretting requirements.

When the lower loading plate 5 is dynamically loaded, the switch valve 26 is in the left position, and the accumulator group 27 together with the hydraulic pump 22 provides hydraulic oil for the loading execution unit 1 through the oil port A1 and the oil port P1. During the dynamic test, the lower loading plate moves very fast, and the hydraulic output power and flow rate in the hydraulic power unit 2 cannot meet the demand for rapid loading. The accumulator group 27 needs to release high-pressure oil to supplement this part of the flow, that is, dynamic loading During the process, almost all of the oil for loading the total execution unit 1 is provided by the accumulator group 27 .

Further, as shown in FIG. 1 and FIG. 2 , the overall loading execution unit 1 includes: at least one first vertical loading execution unit 11 , at least one second vertical loading execution unit 12 , and at least one third vertical loading execution unit 12 The execution unit 13 , at least one left-load execution unit 14 , at least one right-load execution unit 15 , and at least one post-load execution unit 16 . In a specific embodiment of the present invention, the number of each load execution unit is one. Regarding the number of each load execution unit, there is no limit here, and it can be set according to the actual situation.

Each of the first vertical loading execution units 11 is connected to the beam 7 and the upper loading plate 4 respectively, and each of the second vertical loading execution units 12 is connected to the lower loading plate 5. The third vertical loading execution units 13 are all connected to the lower loading plate 5, each of the left loading execution units 14 is connected to the lower loading plate 5, and each of the right loading execution units 15 is connected to the lower loading plate 5. The loading plate 5 is connected, and each of the post-loading execution units 16 is connected to the lower loading plate 5 .

Each of the first vertical load execution units 11 is used to drive the upper loading plate 4 to move vertically, and each of the second vertical load execution units 12 and each of the third vertical load execution units 13 are used to jointly drive the lower load plate 4. The loading plate 5 moves vertically, each of the left loading execution units 14 and each of the right loading execution units 15 are used to jointly drive the lower loading plate 5 to move horizontally from side to side, and each of the rear loading execution units 16 is used to drive the lower loading plate. 5 horizontal movement back and forth.

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, The sixth inverter 37 and the seventh inverter 38 .

The first inverter 32 is connected to the DC bus 31 and the right loading execution unit 15 respectively, and the second inverter 33 is respectively connected to the DC bus 31 and the first vertical loading execution unit 11, the third inverter 34 is respectively connected to the DC bus 31 and the electric motor 21 of the hydraulic power unit 2, and the fourth inverter 35 is respectively connected to the DC bus 31 and the post-loading The execution unit 16 is connected, the fifth inverter 36 is respectively connected to the DC bus 31 and the third vertical loading execution unit 13, and the sixth inverter 37 is respectively connected to the DC bus 31 and the third vertical loading execution unit 13. The second vertical loading execution unit 12 is connected, and the seventh inverter 38 is respectively connected with the DC bus 31 and the left loading execution unit 14 .

Further, the electrical drive unit 3 further includes: a DC-DC converter 39 and a super capacitor group 310 .

The DC-DC converter 39 is connected to the DC bus 31 , and the super capacitor bank 310 is connected to the DC-DC converter 39 .

Further, the electric drive unit 3 further includes: a rectifier 311 for converting external alternating current into direct current to stabilize the voltage of the direct current bus.

When the upper loading plate 4 descends, the first motor generator 111 in the first vertical loading execution unit 11 is in the power generation state, and the generated electric energy passes through the second inverter 33 and the DC bus. 31 and the DC-DC converter 39 are stored in the super capacitor bank 310 .

When the upper loading plate 4 rises, the first motor generator 111 in the first vertical loading execution unit 11 is in an electric state, and the electric energy stored in the super capacitor bank 310 passes through the DC-DC converter 39. The DC bus 31 and the second inverter 33 provide power for the first motor generator 111 in the first vertical load execution unit 11 .

When the left and right horizontal movement of the lower loading plate 5 decelerates, the fifth motor-generator in the right loading execution unit 15 is in the power generation state, and the generated electric energy passes through the first inverter 32 and the DC bus 31 and the DC-DC converter 39, stored in the super capacitor bank 310; the fourth motor generator in the left loading execution unit 14 is in the power generation condition, and the generated electric energy is passed through the seventh inverter 38. The DC bus 31 and the DC-DC converter 39 are stored in the super capacitor bank 310.

When the left and right horizontal movement of the lower loading plate 5 is accelerated, the fifth motor-generator in the right loading execution unit 15 is in the electric state, and the electric energy stored in the super capacitor bank 310 is passed through the DC-DC converter 39 , the DC bus 31 and the first inverter 32 provide power for the fifth motor-generator in the right loading execution unit 15; the fourth motor-generator in the left loading execution unit 14 is in the power generation condition , the electric energy stored in the super capacitor bank 310 provides power for the fourth motor generator in the left loading execution unit 14 via the DC-DC converter 39 , the DC bus 31 and the seventh inverter 38 . Through the above process, the electric drive unit 3 realizes the efficient recovery and utilization of the gravitational potential energy of the upper loading plate 4 and the braking kinetic energy of the lower loading plate 5 during the deceleration process.

Specifically, the first vertical loading execution unit 11 includes: a first motor generator 111, a first reducer 112, a first screw transmission pair 113, a first push rod 114, a first control valve 115, a first container cavity 116 and second cavity 117 . Since the specific structures of the loading and execution units in the present invention are the same, here only the structure of the first vertical loading and execution unit 11 is taken as an example to provide a schematic structural diagram, and the structures of other loading and execution units are not described one by one here. The structure of the first vertical loading execution unit 11 is shown in FIG. 3 .

The first motor generator 111 is connected to the electric drive unit 3 , the first reducer 112 is connected to the first motor generator 111 , and the first screw transmission pair 113 is connected to the first reducer 112 is connected, and the first push rod 114 is connected to the first reducer 112 through the first screw transmission pair 113 .

Driven by the electric drive unit 3 , the first motor generator 111 converts the rotational motion of the first push rod 114 through the first reducer 112 and the first screw transmission pair 113 in sequence. Linear movement to drive the upper loading plate 4 to move up and down.

The oil port A2 of the first control valve is connected to the first chamber 116, the oil port B2 of the first control valve is connected to the second chamber 117, the oil port P2 of the first control valve is connected to the hydraulic power unit 2, and the first control valve is connected to the hydraulic power unit 2. An oil port T2 of a control valve is connected to the second oil tank.

When the upper loading plate 4 is lowered, the first control valve 115 works in the left position, the oil port B2 of the first control valve 115 is connected to the oil port P2, the oil port A2 is connected to the oil port T2, and the hydraulic pump 22 of the oil flows into the second chamber 117 , and the oil in the first chamber 116 flows into the second oil tank through the oil port T2 ; the first motor generator 111 controls the descending speed of the upper loading plate 4 .

When the upper loading plate rises, the first control valve works in the right position, the oil port A2 of the first control valve is connected to the oil port P2, the oil port B2 is connected to the oil port T2, and the hydraulic pump 22 The oil flowing into the first chamber 116 , and the oil in the second chamber 117 flows into the second oil tank through the oil port T2 ; the first motor generator 111 controls the ascending speed of the upper loading plate 4 .

Further, each of the loading execution units can also be composed of an electric cylinder 118 and a hydraulic cylinder 119, wherein the nut push rod 1110 of the electric cylinder 118 is connected with the piston rod 1111 of the hydraulic cylinder 119. On this basis, the hydraulic cylinder includes a first In the chamber 116 and the second chamber 117, the loading execution unit further includes a first motor generator 111, a first reducer 112, a first screw transmission pair 113, and a first control valve 115. The difference from the previous embodiment is that, The nut push rod 1110 of the electric cylinder 118 is connected to the piston rod 1111 of the hydraulic cylinder 119, and the movement of the loading plate is driven by the cooperation of the electric cylinder 118 and the hydraulic cylinder 119. Specifically, since the structures of each loading and execution unit are the same, here only the structure of the first vertical loading and execution unit is taken as an example to give a schematic structural diagram, and the structures of other loading and execution units are not described one by one here.

Specifically, the second vertical loading execution unit 12 includes: a second motor-generator, a second reducer, a second screw transmission pair, a second push rod, a second control valve 125, a third chamber and a fourth container; the third vertical load execution unit 13 includes: a third motor generator, a third reducer, a third screw transmission pair, a third push rod, a third control valve 135, a fifth container and a sixth cavities.

The second motor-generator is connected to the electric drive unit 3, the second reducer is connected to the second motor-generator, the second screw transmission pair is connected to the second reducer, and the second reducer is connected to the second reducer. The second push rod is connected to the second reducer through the second screw transmission pair; the third motor-generator is connected to the electric drive unit 3, and the third reducer is connected to the third motor-generator The third screw transmission pair is connected with the third reducer, and the third push rod is connected with the third reducer through the third screw transmission pair.

Driven by the electric drive unit 3, the second motor generator converts the rotary motion into the linear motion of the second push rod through the second reducer and the second screw transmission pair in turn. Driven by the electric drive unit 3, the third motor-generator converts the rotational motion into the linear motion of the third push rod through the third reducer and the third screw transmission pair in turn, and jointly drives the The up and down movement of the lower loading plate 5 .

The oil port A5 of the second control valve 125 is connected to the third chamber, the oil port B5 of the second control valve 125 is connected to the fourth chamber, and the oil port P5 of the second control valve 125 is connected to the hydraulic power unit 2 connection, the 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 chamber, the oil port B4 of the third control valve 135 is connected to the sixth chamber, and the oil port P4 of the third control valve 135 is connected to the hydraulic power The unit 2 is connected, 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 works in the right position, the oil port A5 of the second control valve 125 communicates with the oil port P5, the oil port B5 communicates with the oil port T5, and the The oil of the hydraulic pump 22 flows into the third chamber, and the oil in the fourth chamber flows into the third tank through the oil port T5; the third control valve 135 works in the right position, and the third The oil port A4 of the three control valve 135 is communicated with the oil port P4, the oil port B4 is communicated with the oil port T4, the oil of the hydraulic pump 22 flows into the fifth chamber, and the oil in the sixth chamber passes through the The oil port T4 flows into the fourth oil tank; the second motor generator and the third motor generator jointly control the descending speed of the lower loading plate 5 .

When the lower loading plate 5 rises, the second control valve 125 works in the left position, the oil port B5 of the second control valve 125 is connected to the oil port P5, the oil port A5 is connected to the oil port T5, the oil port B5 of the second control valve 125 The oil of the hydraulic pump 22 flows into the fourth cavity, and the oil in the third cavity flows into the third tank through the oil port T5; the third control valve 135 works in the left position, and the third control valve 135 The oil port B4 is connected to the oil port P4, the oil port A4 is connected to the oil port T4, the oil of the hydraulic pump 22 flows into the sixth cavity, and the oil in the fifth cavity flows into the oil port T4. The fourth fuel tank; the second motor generator and the third motor generator jointly control the rising speed of the lower loading plate 5 .

Further, the left loading 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 chamber and an eighth chamber; The right loading 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 chamber and a tenth chamber.

The fourth motor generator is connected to the electric drive unit 3, the fourth speed reducer is connected to the fourth motor generator, the fourth screw transmission pair is connected to the fourth speed reducer, and the fourth speed reducer is connected to the fourth speed reducer. The fourth push rod is connected with the fourth reducer through the fourth screw transmission pair; the fifth motor-generator is connected with the electric drive unit 3, and the fifth reducer is connected with the fifth motor-generator The fifth screw transmission pair is connected with the fifth reducer, and the fifth push rod is connected with the fifth reducer through the fifth screw transmission pair.

Driven by the electric drive unit 3, the fourth motor-generator converts the rotational motion into the linear motion of the fourth push rod through the fourth reducer and the fourth screw transmission pair in turn. Driven by the electric drive unit 3, the fifth motor-generator converts the rotational motion into the linear motion of the fifth push rod through the fifth reducer and the fifth screw transmission pair in turn, and together drive the Left and right movement of the lower loading plate 5 .

The oil port A6 of the fourth control valve 145 is connected to the seventh chamber, the oil port B6 of the fourth control valve 145 is connected to the eighth chamber, and the oil port P6 of the fourth control valve 145 is connected to the hydraulic power unit 2 connection, the oil port T6 of the fourth control valve 145 is connected to the fifth oil tank.

The oil port A3 of the fifth control valve 155 is connected to the ninth chamber, the oil port B3 of the fifth control valve 155 is connected to the tenth chamber, and the oil port P3 of the fifth control valve 155 is connected to the hydraulic power unit 2 connection, the oil port T3 of the fifth control valve 155 is connected to the sixth oil tank.

When the lower loading plate 5 moves to the left, the fourth control valve 145 works in the left position, the oil port B6 of the fourth control valve 145 is connected to the oil port P6, the oil port A6 is connected to the oil port T6, and the oil port B6 of the fourth control valve 145 is connected to the oil port P6. The oil of the hydraulic pump 22 flows into the seventh chamber, and the oil in the eighth chamber flows into the fifth tank through the oil port T6; the fifth control valve 155 works in the right position, and the fifth control valve 155 The oil port B3 is communicated with the oil port P3, the oil port A3 is communicated with the oil port T3, the oil of the hydraulic pump 22 flows into the tenth chamber, and the oil in the ninth chamber flows through the oil port T3 The sixth fuel tank; the fourth motor-generator and the fifth motor-generator jointly control the leftward movement speed of the lower loading plate 5 .

When the lower loading plate 5 moves to the right, the fourth control valve 145 works in the 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, and the hydraulic pressure The oil of the pump 22 flows into the eighth chamber, and the oil in the seventh chamber 148 flows into the fifth tank through the oil port T6; the fifth control valve 155 works in the left position, and the fifth control valve 155 The oil port A3 is communicated with the oil port P3, the oil port B3 is communicated with the oil port T3, the oil of the hydraulic pump 22 flows into the ninth chamber, and the oil in the tenth chamber flows through the oil port T3 The sixth fuel tank; the fourth motor generator and the fifth motor generator jointly control the speed at which the lower loading plate 5 moves to the right.

Further, the post-loading execution unit 16 includes: a sixth motor generator, a sixth reducer, a sixth screw transmission pair, a sixth push rod, a sixth control valve, an eleventh chamber and a twelfth chamber .

The sixth motor-generator is connected to the electric drive unit 3, the sixth reducer is connected to the sixth motor-generator, the sixth screw transmission pair is connected to the sixth reducer, and the sixth reducer is connected to the sixth reducer. The sixth push rod is connected with the sixth reducer through the sixth screw transmission pair.

Driven by the electric drive unit 3, the sixth motor-generator converts the rotational motion into the linear motion of the sixth push rod through the sixth reducer and the sixth screw transmission pair in turn, so as to drive the The forward and backward movement of the lower loading plate 5 .

The oil port A7 of the sixth control valve is connected to the eleventh chamber, the oil port B7 of the sixth control valve is connected to the twelfth chamber, and the oil port P7 of the sixth control valve is connected to the hydraulic power unit 2 , the oil port T7 of the sixth control valve is connected to the 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, and the hydraulic pump 22 The oil in the twelfth volume flows into the twelfth volume, and the oil in the eleventh volume flows into the seventh tank through the oil port T3; the sixth motor-generator controls the speed at which the lower loading plate 5 moves forward.

When the lower loading plate 5 moves backward, the sixth control valve works in the down position, the oil port A7 of the sixth control valve is connected with the oil port P7, the oil port B7 is connected with the oil port T7, the hydraulic pump 22 The oil flows into the eleventh volume chamber, the twelfth volume chamber flows into the seventh fuel tank through the oil port T3; the sixth motor generator controls the backward movement speed of the lower loading plate 5.

In the present invention, during the movement of the loading execution unit, the speed and position of each push rod are controlled by the motor generator, the hydraulic power unit provides hydraulic energy for the loading execution unit through each control valve, and each control valve The valve can be kept fully open without throttling control of the high pressure oil provided by the hydraulic power unit, thereby greatly reducing the throttling loss of the compression shear testing machine system.

In addition, the execution unit of the traditional compression shear testing machine is a hydraulic cylinder, which is usually large in size, up to 1 m in diameter, and requires a large flow of oil.

In the present invention, the hydraulic-electric hybrid drive is adopted, that is, the combined output force of the electromechanical transmission (motor-ball screw) and the hydraulic transmission drives the movement of the loading plate. Select the appropriate ratio of output force between electromechanical transmission and hydraulic transmission. According to the force balance principle, under the condition of the same output force, the output force of the hydraulic transmission part is reduced, and the corresponding size is also reduced. During the dynamic loading process, an accumulator is required. The flow provided is also reduced, so the number of accumulators can be significantly reduced.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (7)

1. a high-power electro-hydraulic control system for a compression-shear testing machine, the compression-shear testing machine comprises a column, a beam, an upper loading plate and a lower loading plate, and is characterized in that, the high-power electro-hydraulic control system includes : Loading execution unit, hydraulic power unit and electric drive unit; A loading execution unit is used to drive the upper loading plate and the lower loading plate of the compression shear testing machine to move in different directions; a hydraulic power unit, connected to the overall loading and execution unit, for providing hydraulic oil to the overall loading and execution unit; an electric drive unit, connected to the overall loading execution unit and the hydraulic power unit, respectively, for providing electric power to the overall loading execution unit and the hydraulic power unit, and controlling the running speed of the overall loading execution unit; When the upper loading plate descends, the electrical energy generated by the loading execution unit is stored in the electrical driving unit; when the upper loading plate rises, the electrical energy stored by the electrical driving unit is used for the loading execution overall unit Provide power; when the left and right horizontal movement of the lower loading plate decelerates, the electrical energy generated by the loading execution total unit is stored in the electric drive unit; when the left and right horizontal movement of the lower loading plate is accelerated, the electric drive The electrical energy stored in the unit provides power for the loading execution total unit; The hydraulic power unit includes: an electric motor, a hydraulic pump, a one-way valve, a relief valve, a first oil tank, a switch valve and an accumulator group; The electric motor is coaxially connected to the hydraulic pump, the oil inlet of the hydraulic pump is connected to the first oil tank, and the oil outlet of the hydraulic pump is respectively connected to the oil port P0 of the one-way valve and the The oil inlet of the relief valve is connected, the oil port A0 of the one-way valve is communicated with the oil port P1 of the on-off valve, and the accumulator group is communicated with the oil port A1 of the on-off valve; the hydraulic pump together with the accumulator group to provide hydraulic oil for the overall loading execution unit; When the lower loading plate is statically loaded, the on-off valve is in the right position, and the oil required by the overall loading execution unit is provided by a hydraulic pump alone; When the lower loading plate is dynamically loaded, the on-off valve is in the left position, and the accumulator group provides hydraulic oil for the loading execution unit through the oil port A1 and the oil port P1 together with the hydraulic pump; The overall loading execution unit includes: 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 unit and at least one post-load execution unit; Each of the first vertical loading execution units is connected to the beam and the upper loading plate respectively, each of the second vertical loading execution units is connected to the lower loading plate, and each of the third vertical loading execution units is connected to the lower loading plate. The loading execution units are all connected to the lower loading board, each of the left loading execution units is connected to the lower loading board, and each of the right loading execution units is connected to the lower loading board, and each of the post-loading execution units is connected to the lower loading board. The units are all connected with the lower loading plate; Each of the first vertical loading execution units is used to drive the upper loading plate to move vertically, and each of the second vertical loading execution units and each of the third vertical loading execution units are used to jointly drive the lower loading plate to move vertically. Each of the left loading execution units and each of the right loading execution units are used to jointly drive the lower loading plate to move horizontally from side to side, and each of the rear loading execution units is used to drive the lower loading plate to move horizontally back and forth. 2. The high-power electro-hydraulic control system for a compression-shear testing machine according to claim 1, wherein the electric drive unit comprises: a DC bus, a first inverter, a second inverter, a first three inverters, a fourth inverter, a fifth inverter, a sixth inverter and a seventh inverter; The first inverter is respectively connected with the DC bus and the right loading execution unit, the second inverter is respectively connected with the DC bus and the first vertical loading execution unit, the first The three inverters are respectively connected to the DC bus and the motor of the hydraulic power unit, the fourth inverter is respectively connected to the DC bus and the post-loading execution unit, and the fifth inverter is respectively is connected to the DC bus and the third vertical loading execution unit, the sixth inverter is respectively connected to the DC bus and the second vertical loading execution unit, and the seventh inverter is respectively Connected with the DC bus and the left loading execution unit. 3. The high-power electro-hydraulic control system for a compression-shear testing machine according to claim 2, wherein the electric drive unit further comprises: a DC-DC converter and a supercapacitor group; the DC-DC converter is connected to the DC bus, and the super capacitor bank is connected to the DC-DC converter; The first vertical loading execution unit includes: a first motor generator, a first reducer, a first screw transmission pair, a first push rod, a first control valve, a first cavity and a second cavity; The first motor-generator is connected to the electric drive unit, the first speed reducer is connected to the first motor-generator, the first screw transmission pair is connected to the first speed reducer, and the first speed reducer is connected to the first speed reducer. A push rod is connected with the reducer through the screw transmission pair; Driven by the electric drive unit, the first motor-generator converts the rotational motion into the linear motion of the first push rod through the first reducer and the first screw transmission pair in turn, so as to drive the The up and down movement of the above loading plate; The left loading execution unit includes: a fourth motor-generator, a fourth speed reducer, a fourth screw transmission pair, a fourth push rod, a fourth control valve, a seventh chamber and an eighth chamber; the right loading executes The unit includes: a fifth motor-generator, a fifth reducer, a fifth screw transmission pair, a fifth push rod, a fifth control valve, a ninth chamber and a tenth chamber; The fourth motor-generator is connected to the electric drive unit, the fourth speed reducer is connected to the fourth motor-generator, the fourth screw transmission pair is connected to the fourth speed reducer, and the fourth speed reducer is connected to the fourth speed reducer. The fourth push rod is connected with the fourth reducer through the fourth screw transmission pair; the fifth motor-generator is connected with the electric drive unit, and the fifth reducer is connected with the fifth motor-generator , the fifth screw transmission pair is connected with the fifth reducer, and the fifth push rod is connected with the fifth reducer through the fifth screw transmission pair; Driven by the electric drive unit, the fourth motor-generator converts the rotational motion into the linear motion of the fourth push rod through the fourth reducer and the fourth screw transmission pair in sequence, and the fourth Driven by the electric drive unit, the five motor generators sequentially convert the rotational motion into the linear motion of the fifth push rod through the fifth reducer and the fifth screw transmission pair, and jointly drive the lower loading left and right movement of the board; When the upper loading plate descends, the first motor-generator in the first vertical loading execution unit is in a power generation state, and the generated electric energy is passed through the second inverter, the DC bus and the DC - a DC converter, stored in the supercapacitor bank; When the upper loading plate rises, the first motor-generator in the first vertical loading execution unit is in an electric working condition, and the electric energy stored by the super capacitor bank passes through the DC-DC converter, the DC a bus bar and a second inverter to provide power for the first motor-generator in the first vertical loading execution unit; When the left-right horizontal movement of the lower loading plate decelerates, the fifth motor-generator in the right-loading execution unit is in a power generation state, and the generated electric energy is passed through the first inverter, the DC bus and the DC -DC converter, stored in the super capacitor bank; the fourth motor generator in the left loading execution unit is in the power generation condition, and the generated electric energy is passed through the seventh inverter, the DC bus and all The DC-DC converter is stored in the super capacitor bank; When the left-right horizontal movement of the lower loading plate is accelerated, the 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 passes through the DC-DC converter, the DC The busbar and the first inverter provide power for the fifth motor-generator in the right-loading execution unit; the fourth motor-generator in the left-loading execution unit is in an electric state, and the supercapacitor bank stores the Electrical energy powers a fourth motor-generator in the left-loaded execution unit via the DC-DC converter, the DC bus, and a seventh inverter. 4. The high-power electro-hydraulic control system for a compression-shear testing machine according to claim 3, wherein the oil port A2 of the first control valve is connected with the first cavity, and the oil port B2 of the first control valve is connected to the first chamber. connected to the second chamber, the oil port P2 of the first control valve is connected to the hydraulic power unit, and the oil port T2 of the first control valve is connected to the second oil tank; When the upper loading plate is lowered, the first control valve works in the left position, the oil port B2 of the first control valve is connected to the oil port P2, the oil port A2 is connected to the oil port T2, and the oil of the hydraulic pump The oil flows into the second cavity, and the oil in the first cavity flows into the second oil tank through the oil port T2; the first motor generator controls the descending speed of the upper loading plate 33; When the upper loading plate rises, the first control valve works in the right position, the oil port A2 of the first control valve is connected to the oil port P2, the oil port B2 is connected to the oil port T2, and the hydraulic pump The oil flows into the first cavity, and the oil in the second cavity flows into the second oil tank through the oil port T2; the first motor generator controls the ascending speed of the upper loading plate. 5. The high-power electro-hydraulic control system for a compression-shear testing machine according to claim 1, wherein the second vertical loading execution unit comprises: a second motor generator, a second reducer, a second Two screw transmission pairs, a second push rod, a second control valve, a third cavity and a fourth cavity; the third vertical load execution unit includes: a third motor generator, a third reducer, a third screw The transmission pair, the third push rod, the third control valve, the fifth chamber and the sixth chamber; The second motor-generator is connected to the electric drive unit, the second speed reducer is connected to the second motor-generator, the second screw transmission pair is connected to the second speed reducer, and the first speed reducer is connected to the second speed reducer. The second push rod is connected with the second reducer through the second screw transmission pair; the third motor-generator is connected with the electric drive unit, and the third reducer is connected with the third motor-generator , the third screw transmission pair is connected with the third reducer, and the third push rod is connected with the third reducer through the third screw transmission pair; Driven by the electric drive unit, the second motor-generator converts the rotational motion into the linear motion of the second push rod through the second reducer and the second screw transmission pair in sequence, and the first Driven by the electric drive unit, the three motor generators sequentially convert the rotational motion into the linear motion of the third push rod through the third reducer and the third screw transmission pair, and jointly drive the lower loading The up and down movement of the board; The oil port A5 of the second control valve is connected to the third chamber, the oil port B5 of the second control valve is connected to the fourth chamber, the oil port P5 of the second control valve is connected to the hydraulic power unit, and the The oil port T5 of the second control valve is connected to the third oil tank; The oil port A4 of the third control valve is connected to the fifth chamber, the oil port B4 of the third control valve is connected to the sixth chamber, and the oil port P4 of the third control valve is connected to the hydraulic power unit, The oil port T4 of the third control valve is connected to the fourth oil tank 6; When the lower loading plate descends, the second control valve works in the right position, the oil port A5 of the second control valve is connected to the oil port P5, the oil port B5 is connected to the oil port T5, and the hydraulic pump The oil flows into the third cavity, and the oil in the fourth cavity flows into the third tank through the oil port T5; the third control valve works in the right position, and the oil in the third control valve Port A4 is communicated with oil port P4, and oil port B4 is communicated with oil port T4. The oil of the hydraulic pump flows into the fifth chamber, and the oil in the sixth chamber flows into the fourth oil tank through the 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 in the left position, the oil port B5 of the second control valve is connected to the oil port P5, the oil port A5 is connected to the oil port T5, and the hydraulic pump The oil flows into the fourth cavity, and the oil in the third cavity flows into the third tank through the oil port T5; the third control valve works in the left position, and the B4 oil port of the third control valve is connected to the oil The port P4 is connected, the oil port A4 is connected with the oil port T4, the oil of the hydraulic pump flows into the sixth cavity, and the oil in the fifth cavity flows into the fourth oil tank through the oil port T4; The second motor generator and the third motor generator jointly control the ascending speed of the lower loading plate. 6. The high-power electro-hydraulic control system for a compression-shear testing machine according to claim 3, wherein the oil port A6 of the fourth control valve is connected to the seventh chamber, and the oil of the fourth control valve is connected to the seventh chamber. The port B6 is connected with the eighth volume chamber, the oil port P6 of the fourth control valve is connected with the hydraulic power unit, and the oil port T6 of the fourth control valve is connected with the fifth oil tank; The oil port A3 of the fifth control valve is connected to the ninth chamber, the oil port B3 of the fifth control valve is connected to the tenth chamber, the oil port P3 of the fifth control valve is connected to the hydraulic power unit, and the The oil port T3 of the fifth control valve is connected with the sixth oil tank; When the lower loading plate moves to the left, the fourth control valve works in the left position, the oil port B6 of the fourth control valve is connected to the oil port P6, the oil port A6 is connected to the oil port T6, and the hydraulic pump The oil flows into the seventh chamber, and the oil in the eighth chamber flows into the fifth tank through the oil port T6; the fifth control valve works in the right position, and the oil port B3 of the fifth control valve is connected to the oil The port P3 is connected, the oil port A3 is connected with the oil port T3, the oil of the hydraulic pump flows into the tenth volume chamber, and the oil in the ninth volume flows into the sixth oil tank through the oil port T3; The four motor-generators and the fifth motor-generator jointly control the leftward movement speed of the lower loading plate; When the lower loading plate moves to the right, the fourth control valve works in the right position, the oil port A6 of the fourth control valve is communicated with the oil port P6, the oil port B6 is communicated with the oil port T6, and the oil of the hydraulic pump is connected. The oil flows into the eighth chamber, and the oil in the seventh chamber flows into the fifth tank through the oil port T6; the fifth control valve works in the left position, and the oil port A3 of the fifth control valve and the oil port P3 is connected, oil port B3 is connected with oil port T3, the oil of the hydraulic pump flows into the ninth volume, and the oil in the tenth volume flows into the sixth tank through the oil port T3; the fourth The motor-generator together with the fifth motor-generator controls the speed at which the lower loading plate moves to the right. 7. The high-power electro-hydraulic control system for a compression-shear testing machine according to claim 1, wherein the post-loading execution unit comprises: a sixth motor-generator, a sixth reducer, and a sixth screw drive Vice, sixth push rod, sixth control valve, eleventh chamber and twelfth chamber; The sixth motor generator is connected to the electric drive unit, the sixth speed reducer is connected to the sixth motor generator, the sixth screw transmission pair is connected to the sixth speed reducer, and the sixth speed reducer is connected to the sixth speed reducer. The six push rods are connected with the sixth reducer through the screw transmission pair; The sixth motor-generator, driven by the electric drive unit, sequentially converts the rotational motion into the linear motion of the sixth push rod through the sixth reducer and the sixth screw transmission pair, so as to drive the the forward and backward movement of the lower loading plate; The oil port A7 of the sixth control valve is connected to the eleventh chamber, the oil port B7 of the sixth control valve is connected to the twelfth chamber, and the oil port P7 of the sixth control valve is connected to the hydraulic power unit, The oil port T7 of the sixth control valve is connected to the seventh oil tank; When the lower loading plate moves forward, the sixth control valve works in the upper position, the oil port B7 of the sixth control valve is connected to the oil port P7, the oil port A7 is connected to the oil port T7, and the oil of the hydraulic pump The liquid flows into the twelfth chamber, and the oil in the eleventh chamber flows into the seventh tank through the oil port T3; the sixth motor-generator controls the forward speed of the lower loading plate; When the lower loading plate moves backward, the sixth control valve works in the lower position, the oil port A7 of the sixth control valve is connected to the oil port P7, the oil port B7 is connected to the oil port T7, and the oil of the hydraulic pump The liquid flows into the eleventh volume chamber, and the twelfth volume chamber flows into the seventh fuel tank through the oil port T3; the sixth motor generator controls the backward movement speed of the lower loading plate.

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