CN117905737A - Pump control system of oil-electricity hybrid drive numerical control bending machine - Google Patents

Abstract

The present invention discloses a pump control system for a hybrid oil-electric drive CNC bending machine, which relates to the technical field of pump control systems for CNC bending machines, including a CNC system, a hydraulic main servo motor MA, a main servo drive A, a direct drive servo motor MB, a direct drive servo B, an oil pump, a two-position four-way electromagnetic reversing valve, a relief valve, a one-way valve, a hybrid drive cylinder, a filling valve, a pressure sensor, an oil tank, and oil tank accessories. The present invention inputs precise feedback signals from a temperature sensor and a magnetic scale to the CNC system, and the CNC system can compare the real-time feedback data with the internally set data to determine and select the working mode to adapt to different working conditions, thereby achieving the ultimate energy-saving and noise reduction effect of the pump control system for the hybrid oil-electric drive CNC bending machine, filling the gap of servo direct drive power in medium and large CNC bending machines, and also solving the problem of starting the low-temperature hydraulic system.

Description

A pump control system for a hybrid oil-electric drive CNC bending machine

Technical Field

The invention relates to the technical field of pump control systems for numerically controlled bending machines, in particular to a pump control system for an oil-electric hybrid driven numerically controlled bending machine.

Background technique

As one of the indispensable equipment in the sheet metal manufacturing industry, the quality of CNC bending machines depends on the control accuracy of machine tools, and the efficiency of production depends on the speed of machine tools. With the development and progress of society, the transformation, updating and upgrading of intelligent equipment is mainly aimed at improving production efficiency and reducing energy consumption output costs. The development history of CNC bending machines has always insisted on upgrading around the purpose of reducing consumption and improving efficiency, from torsion shaft machines with three-phase asynchronous motors as the main motor as the power output unit, to electro-hydraulic valve-controlled CNC bending machines with servo motors as the main motors as the power output units, and then to pump-controlled CNC bending machines with servo motors as the main motors as the power output units;

In recent years, the elites in the industry have also developed pure electric CNC bending machines with servo motors as the main motors and power output units. However, due to various reasons, pure electric CNC bending machines have never been able to break through the field of medium and large CNC bending machines, so they cannot be further upgraded for the current medium and large CNC bending machines. In order to change the current blank situation and further improve the performance of medium and large CNC bending machines, it is urgent to launch a pump control system for oil-electric hybrid drive CNC bending machines to achieve further energy saving, consumption reduction, noise reduction and efficiency improvement. At the same time, it can also add "tiger wings" for special low-temperature conditions when the hydraulic system cannot start normally, to protect the whole machine.

Nowadays, each cycle of CNC bending machines can be divided into six processes: stop, fast down, working feed, pressure maintenance, unloading, and return. In each working process, the pressure and speed provided to the hydraulic system are also different. The hydraulic system of the traditional CNC bending machine is provided by an ordinary three-phase asynchronous motor (speed is not adjustable) and a quantitative hydraulic pump to provide pressure and hydraulic oil. However, in the entire cycle of the machine tool (including the machine tool stop state), the oil pump is driven by a constant high-speed motor to continuously supply pressure oil to the hydraulic system. However, in each cycle, only during the working feed and return, the motor does useful work, and the rest of the hydraulic oil flows back to the oil tank through the electric proportional relief valve, and the motor does useless work. In the whole process, useless work accounts for about 2/3. At this time, the hydraulic oil temperature rises faster and the oil temperature is higher, which affects the service life of the hydraulic oil and is also an unfavorable factor for the hydraulic system.

Therefore, the traditional electro-hydraulic CNC synchronous bending machine has low efficiency, high energy consumption, high noise, and is not environmentally friendly during the entire cycle, compared with the pump control system of the bending machine, which is a hybrid oil-electric drive CNC bending machine. The low temperature environment is not conducive to the start-up of the hydraulic system.

Summary of the invention

The purpose of the present invention is to provide a pump control system for an oil-electric hybrid drive CNC bending machine in order to solve the defects of the traditional hydraulic system.

To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pump control system of an oil-electric hybrid drive CNC bending machine, comprising a CNC system, a hydraulic main servo motor MA, a main servo drive A, a direct drive servo motor MB, a direct drive servo B, an oil pump, a two-position four-way electromagnetic reversing valve, a relief valve, a one-way valve, a hybrid drive cylinder, a filling valve, a pressure sensor, and an oil tank and oil tank accessories. The two-position four-way electromagnetic reversing valve comprises a reversing valve A and a reversing valve B. The relief valve comprises a main pressure relief valve, a back pressure relief valve, a safety relief valve and an unloading relief valve. The one-way valve comprises a one-way valve A, a one-way valve B, a one-way valve C and a one-way valve D. The hybrid drive cylinder is composed of an upper chamber of a hybrid drive cylinder, a hybrid drive cylinder piston, a hybrid drive cylinder direct drive component and a lower chamber of a hybrid drive cylinder.

The main servo drive A is electrically connected to the numerical control system and the hydraulic main servo motor MA through a wire, and the direct drive servo B is electrically connected to the numerical control system and the direct drive servo motor MB through a wire. The output end of the hydraulic main servo motor MA is connected to the oil pump drive end, and the direct drive servo motor MB is used to directly drive the skateboard to move;

The oil pump suction port is connected to the oil tank, and the oil pump suction port is located in the oil tank and is connected to an oil suction filter. The output end of the oil pump is connected to the control oil circuit of the upper chamber of the hybrid drive cylinder through a one-way valve D, a one-way valve A, a reversing valve A, and a filling valve. The lower chamber of the hybrid drive cylinder is connected to the oil tank through a one-way valve B, a back pressure relief valve, and a safety relief valve. The upper chamber of the drive cylinder is connected to the oil pump through another pipeline and through the unloading relief valve, the one-way valve C, the reversing valve B, and the one-way valve D.

The input pipe of the upper chamber of the driving cylinder, the output pipe of the lower chamber of the hybrid driving cylinder and the output pipe of the oil pump are respectively provided with an M1 pressure measuring interface, an M2 pressure measuring interface and an Mp pressure measuring interface. The pressure sensor is installed above the M1 pressure measuring interface, and the pressure sensor is connected to the numerical control system to monitor the hydraulic pressure of the hydraulic system in real time and feed it back to the numerical control system.

As a further solution of the present invention: a magnetic scale is connected to the outer side of the hybrid drive cylinder piston to detect the cylinder movement position and movement speed. The magnetic scale is connected to the numerical control system, and the magnetic scale feeds back the detected signal to the numerical control system.

As a further solution of the present invention: the oil tank accessories include an air filter, a temperature sensor, and a hydraulic gauge. The air filter, temperature sensor, and hydraulic gauge are installed on the outside of the oil tank and extend to the inside of the oil tank. The temperature sensor and hydraulic gauge are connected to the numerical control system. The temperature sensor is used to monitor the hydraulic oil temperature of the hydraulic system in real time and feed back to the numerical control system.

As a further solution of the present invention: the reversing valve is connected to a numerical control system, the power-on sequence of the reversing valve is set by the numerical control system, and the main pressure relief valve is connected to an output end of the oil pump, thereby ensuring the safety of the main pressure.

Compared with the prior art, the present invention has the following beneficial effects:

By setting up a pump control system for a hybrid-electric CNC bending machine, according to environmental changes and the operating conditions of the machine tool at each stage, the precise feedback signals of the temperature sensor and the magnetic scale are input to the CNC system. The CNC system can compare the real-time feedback data with the internally set data to determine and select the working mode to adapt to different working conditions, thereby achieving the ultimate energy-saving and noise reduction effect of the pump control system of the hybrid-electric CNC bending machine, filling the gap of servo direct drive power in medium and large CNC bending machines, and also solving the problem of starting the low-temperature hydraulic system. The output signal of the CNC system changes the speed of the servo motor by controlling the servo driver to achieve the advantage of overflow-free control, achieving the purpose of extremely high efficiency, extremely energy-saving, extremely low noise and extremely environmentally friendly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a pump control system of an oil-electric hybrid drive CNC bending machine of the present invention;

FIG2 is a timing chart of the hydraulic system of the present invention;

FIG. 3 is a schematic diagram of system control in three modes of the present invention.

In the figure: 1. Hydraulic main servo motor MA; 2. Oil tank; 3. Oil suction filter; 4. Oil pump; 5. Hydraulic gauge; 6. Temperature sensor; 7. Air filter; 8. Main pressure relief valve; 9. Check valve A; 10. Reversing valve A; 11. Throttle hole; 12. Filling valve; 13. Pressure sensor; 14. M1 pressure measuring interface; 15. Direct drive servo motor MB; 16. Hybrid drive cylinder upper chamber; 17. Hybrid drive cylinder piston; 18. Hybrid drive cylinder direct drive component; 19. Hybrid drive cylinder lower chamber; 20. Check valve B; 21. M2 pressure measuring interface; 22. Back pressure relief valve; 23. Safety relief valve; 24. Unloading relief valve; 25. Check valve C; 26. Reversing valve B; 27. Mp pressure measuring interface; 28. Check valve D.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

Please refer to Figures 1 to 3. In the embodiment of the present invention, a pump control system of an oil-electric hybrid drive CNC bending machine includes a CNC system, a hydraulic main servo motor MA1, a main servo drive A, a direct drive servo motor MB15, a direct drive servo B, an oil pump 4, a two-position four-way electromagnetic reversing valve, a relief valve, a one-way valve, a hybrid drive cylinder, a filling valve 12, a pressure sensor 13, and an oil tank 2 and oil tank accessories. The two-position four-way electromagnetic reversing valve includes a reversing valve A10 and a reversing valve B26. The relief valve includes a main pressure relief valve 8, a back pressure relief valve 22, a safety relief valve 23, and a unloading relief valve 24. The one-way valve includes a one-way valve A9, a one-way valve B20, a one-way valve C25, and a one-way valve D28. The hybrid drive cylinder is composed of a hybrid drive cylinder upper chamber 16, a hybrid drive cylinder piston 17, a hybrid drive cylinder direct drive component 18, and a hybrid drive cylinder lower chamber 19.

The main servo drive A is electrically connected to the numerical control system and the hydraulic main servo motor MA1 through wires, and the direct drive servo B is electrically connected to the numerical control system and the direct drive servo motor MB15 through wires. The output end of the hydraulic main servo motor MA1 is connected to the driving end of the oil pump 4. The direct drive servo motor MB15 is used to directly drive the skateboard to move;

The oil suction port of the oil pump 4 is connected to the oil tank 2, and the oil suction port of the oil pump 4 is located in the oil tank 2 and is connected to the oil suction filter 3. The output end of the oil pump 4 is connected to the control oil circuit of the upper chamber 16 of the hybrid drive cylinder through the one-way valve D28, the one-way valve A9, the reversing valve A10, and the filling valve 12. The lower chamber 19 of the hybrid drive cylinder is connected to the oil tank 2 through the one-way valve B20, the back pressure relief valve 22, and the safety relief valve 23. The upper chamber 16 of the drive cylinder is connected to the oil pump 4 through another pipeline and through the unloading relief valve 24, the one-way valve C25, the reversing valve B26, and the one-way valve D28;

The input pipe of the upper chamber 16 of the drive cylinder, the output pipe of the lower chamber 19 of the hybrid drive cylinder and the output pipe of the oil pump 4 are respectively provided with an M1 pressure measuring interface 14, an M2 pressure measuring interface 21 and an Mp pressure measuring interface 27. The pressure sensor 13 is installed above the M1 pressure measuring interface 14, and the pressure sensor 13 is connected to the numerical control system to monitor the hydraulic pressure of the hydraulic system in real time and feed it back to the numerical control system;

A magnetic scale is connected to the outside of the hybrid drive cylinder piston 17 to detect the cylinder movement position and movement speed. The magnetic scale is connected to the numerical control system, and the magnetic scale feeds back the detection signal to the numerical control system;

The oil tank accessories include an air filter 7, a temperature sensor 6, and a hydraulic pressure gauge 5. The air filter 7, the temperature sensor 6, and the hydraulic pressure gauge 5 are installed on the outside of the oil tank 2 and extend to the inside of the oil tank 2. The temperature sensor 6 and the hydraulic pressure gauge 5 are connected to the numerical control system. The temperature sensor 6 is used to monitor the hydraulic oil temperature of the hydraulic system in real time and feed it back to the numerical control system.

The reversing valve is connected to the numerical control system, and the power-on sequence of the reversing valve is set by the numerical control system. The main pressure relief valve 8 is connected to the output end of the oil pump to ensure the safety of the main pressure.

In this embodiment, it should be supplemented that: the main pressure relief valve 8 controls the maximum pressure required for the machine tool working condition, the safety relief valve 23 is set to the maximum pressure borne by the lower chamber of the oil cylinder, and the back pressure relief valve 22 is adjusted to the pressure at which the machine tool stops supporting the slide, so that the slide of the machine tool is stationary in any non-pressurized working condition;

The Mp pressure measuring interface 27 measures the main pressure of the system, the M1 pressure measuring interface 14 measures the pressure of the upper chamber 16 of the driving cylinder, and the M2 pressure measuring interface measures the pressure of the lower chamber 19 of the driving cylinder;

The main servo motor MA1 rotates to drive the oil pump to supply hydraulic oil to the hybrid drive cylinder. The direct drive servo motor MB15 directly drives the slide plate to move. The hydraulic oil enters the hybrid drive cylinder through the reversing valve and then flows back to the oil tank 2 through the reversing valve.

The system has three operating modes (see Figure 3). The switching of the three modes is determined by the following conditions: system calculated load: f; system set load: F; temperature sensor feedback temperature: t; system set temperature: T;

Mode 1: When f≤F, this working mode is direct drive servo mode, and the operating status of this mode is as follows:

Stop: The CNC system is in standby mode, and the pump control system of the hybrid drive CNC bending machine is in 0 output and 0 noise state;

Fast down: The numerical control system is connected to the direct drive servo drive B, and the output signal controls the direct drive servo motor MB15 to run forward at high speed to drive the slide plate to move downward at high speed, and the hybrid drive cylinder servo direct drive component 18 drives the hybrid drive cylinder piston 17. The upper chamber 16 of the hybrid drive cylinder absorbs sufficient hydraulic oil from the oil tank 2 through self-priming to fill the upper chamber, and the lower chamber 19 of the hybrid drive cylinder overflows the excess hydraulic oil back to the oil tank 2 through the back pressure relief valve 22;

Working advance: The numerical control system is connected to the direct drive servo drive B, and the output signal controls the direct drive servo motor MB15 to run forward at a low speed to drive the slide plate to work at a low speed, and drives the hybrid drive cylinder piston 17 through the hybrid drive cylinder servo direct drive component 18. The upper chamber 16 of the hybrid drive cylinder continues to absorb sufficient hydraulic oil from the oil tank 2 through self-priming to fill the upper chamber, and the lower chamber 19 of the hybrid drive cylinder overflows the excess hydraulic oil back to the oil tank 2 through the back pressure relief valve 22;

Maintaining pressure: Continue to maintain the working state, adjust the high torque and low speed of the direct drive servo motor MB15 through the target position fed back by the grating ruler, and drive the hybrid drive cylinder piston 17 through the hybrid drive cylinder servo direct drive component 18 to ensure the stability of the bottom dead point;

Unloading: After the holding time is completed, the direct drive servo drive B is controlled by the numerical control system to adjust the high torque and low speed direction of the direct drive servo motor MB15, and the hybrid drive cylinder piston 17 is driven by the hybrid drive cylinder servo direct drive component 18 to complete the unloading;

Return stroke: After unloading is completed, the direct drive servo drive B is controlled by the CNC system to adjust the high torque and high speed direction of the direct drive servo motor MB15, and the hybrid drive cylinder servo direct drive component 18 drives the hybrid drive cylinder piston 17. The lower chamber 19 of the hybrid drive cylinder draws oil from the oil tank 2 through the one-way valve B20 to fill the lower chamber, and the return stroke is completed.

Mode 2: When f≥F and t≤T, this working mode is the preheating protection mode. At this time, the load is greater than the limit capacity of the direct-drive servo motor MB15, and the direct-drive servo mode is not allowed to work. However, the low hydraulic oil temperature is not suitable for the normal start-up and operation of the hydraulic system. At this time, the hydraulic fluid system needs to be preheated to increase its fluidity to achieve the normal working conditions of the hydraulic system. This mode is suitable for special low-temperature conditions. The whole machine continues to work. Its operating status is as follows:

Stop: The CNC system is in standby mode, and the pump control system of the hybrid drive CNC bending machine is in 0 output and 0 noise state.

Fast down: The CNC system is connected to the direct drive servo drive B, and the output signal controls the direct drive servo motor MB15 to run forward at high speed to drive the slide plate to move downward at high speed. The hybrid drive cylinder servo direct drive component 18 drives the hybrid drive cylinder piston 17. The upper chamber 16 of the hybrid drive cylinder absorbs sufficient hydraulic oil from the oil tank through self-priming to fill the upper chamber, and the lower chamber 19 of the hybrid drive cylinder overflows the excess hydraulic oil back to the oil tank 2 through the back pressure relief valve 22.

Return stroke: After unloading is completed, the direct drive servo drive B is controlled by the numerical control system to adjust the high torque and high speed direction of the direct drive servo motor MB15, and the hybrid drive cylinder servo direct drive component 18 drives the hybrid drive cylinder piston 17. The lower chamber 19 of the hybrid drive cylinder sucks oil from the oil tank 2 through the one-way valve 20 to fill the lower chamber, and the return stroke is completed.

The cycle of fast down and return is repeated until the oil temperature of the hydraulic system reaches the set value.

Mode 3: When f≥F and t≥T, this working mode is the oil-electric hybrid drive mode. The direct drive servo motor MB15 is used within the capacity of the direct drive servo motor MB15, and the hydraulic main servo motor MA1 is used outside the capacity of the direct drive servo motor MB15. The purpose is to achieve the ultimate energy saving and noise reduction effect of the pump control system of the oil-electric hybrid drive CNC bending machine. Its operating status is as follows:

Fast down: The numerical control system is connected to the direct drive servo drive B, and the output signal controls the direct drive servo motor MB15 to run forward at high speed to drive the slide plate to move downward at high speed, and the hybrid drive cylinder servo direct drive component 18 drives the hybrid drive cylinder piston 17. The upper chamber 16 of the hybrid drive cylinder absorbs sufficient hydraulic oil from the oil tank 2 through self-priming to fill the upper chamber, and the lower chamber 19 of the hybrid drive cylinder overflows the excess hydraulic oil back to the oil tank 2 through the back pressure relief valve 33;

Working advance: The numerical control system is connected to the main servo drive A, and the output signal controls the hydraulic main servo motor MA1 to drive the oil pump 4 in the forward direction. The hydraulic oil is sucked from the oil tank 2 through the oil suction filter 3, and the high-pressure hydraulic oil is provided to the hydraulic system from the oil discharge port of the oil pump 4. The YV2 of the reversing valve 10 is energized first, and the P-B controls the closing of the filling valve 12 through the throttle hole 11. After the upper chamber 16 of the hybrid drive cylinder is closed, the YV1 of the reversing valve 26 is energized, and the P-B enters the upper chamber 16 of the hybrid drive cylinder through the one-way valve 25 to pressurize the drive cylinder piston 17 to realize the working advance action. At the same time, the direct-drive servo drive B will adjust the direct-drive servo motor MB15 to follow the working advance speed through the real-time feedback position of the grating ruler, and the lower chamber 19 of the hybrid drive cylinder flows away the excess hydraulic oil back to the oil tank 2 through the back pressure relief valve overflow 22;

Maintaining pressure: Continue to maintain the working state, and the target position is fed back by the grating ruler. The CNC system adjusts the main servo drive A to control the high torque and low speed of the hydraulic main servo motor MA1, and pressurizes the drive cylinder piston 17 through the upper chamber 16 of the hybrid drive cylinder. The pressure sensor 6 feeds back the pressure of the hydraulic system to the CNC system in real time to ensure the error of the overload on the workpiece and the stability of the bottom dead point;

Unloading: After the pressure holding time is completed, the main servo drive A is controlled by the CNC system to adjust the hydraulic main servo motor MA1 to make it stationary, and the YV1 of the reversing valve 26 loses power. The high-pressure hydraulic oil in the upper chamber 16 of the hybrid drive cylinder flows through the unloading relief valve 24 and then to the B-T of the reversing valve 26 and flows back to the oil tank 2, thus completing the unloading;

Return stroke: After the unloading is completed, the direct drive servo drive B is controlled by the numerical control system to adjust the high torque and high speed direction of the direct drive servo motor MB15. At this time, the hydraulic main servo motor MA1 remains in standby state, and the hybrid drive cylinder servo direct drive component 18 drives the hybrid drive cylinder piston 17. The lower chamber 19 of the hybrid drive cylinder absorbs oil from the oil tank 2 through the one-way valve B20 to fill the lower chamber, and the upper chamber 16 of the hybrid drive cylinder flows back to the oil tank 2 through the filling valve 12 to complete the return stroke.

This hydraulic system has the following advantages when used:

1. The motor of the traditional CNC machine tool is an ordinary three-phase asynchronous motor (rated speed), while the motor of the pump control system of the oil-electric hybrid drive CNC bending machine is a servo motor (adjustable speed). Since the speed is adjustable, it can not only improve work efficiency, but also save electricity. The noise of the servo motor is lower than that of the ordinary servo motor, thus achieving noise reduction. Since the hydraulic oil temperature is controllable, the service life of the hydraulic oil is extended, thus achieving environmental protection;

2. The main pressure of the traditional hydraulic system is controlled by an electric proportional relief valve, a manual relief valve, and a cartridge valve. The pump control system of the oil-electric hybrid drive CNC bending machine only needs a manual relief valve and a servo motor to control the main pressure. Different bending forces can be achieved by adjusting the torque of the servo motor through the CNC system and servo driver, making the hydraulic system control more intelligent and the structure more optimized.

3. The reversing valve of the traditional CNC hydraulic system (valve control) is an electric proportional reversing valve. The CNC system needs to output analog signals to control the opening size of the electric proportional reversing valve and control the synchronization accuracy of the CNC machine tool. The size of the opening will inevitably cause throttling, resulting in unnecessary energy loss and causing the oil temperature to rise faster. The reversing valve of the pump control system of the oil-electric hybrid drive CNC bending machine is a conventional reversing valve. The opening size does not need to be adjusted. The CNC system only needs to give the electromagnetic reversing valve an energized or de-energized signal to complete the reversing adjustment. The flow rate required by the system is controlled by the servo motor speed and the quantitative oil pump. At this time, the CNC system will determine the speed of the servo motor according to different working conditions, adjust the required hydraulic oil flow rate, and avoid flow throttling losses;

4. The traditional CNC hydraulic system bending machine has a single working mode. Both the fast down and return strokes are hydraulically driven, and the low temperature of the bending machine makes the hydraulic system unable to work normally. The pump control system of the oil-electric hybrid drive CNC bending machine can enable the servo motor in the fast down and return stages. At the same time, the light load condition can be directly driven by pure electric drive. Compared with the traditional hydraulic system, the energy saving effect is further improved. At the same time, the low temperature and light load conditions can also work normally, which improves the equipment use efficiency.

In summary: the technical improvement of the pump control system of the oil-electric hybrid drive CNC bending machine can significantly improve the overall performance of the oil-electric hybrid bending machine, achieving the goals of extremely high efficiency, extremely energy saving, extremely low noise and extremely environmental protection.

What has been described above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims (5)

1. The pump control system of the oil-electricity hybrid drive numerical control bending machine is characterized by comprising a numerical control system, a hydraulic main servo motor MA (1), a main servo drive A, a direct drive servo motor MB (15), a direct drive servo B, an oil pump (4), a two-position four-way electromagnetic reversing valve, an overflow valve, a one-way valve, a hybrid drive cylinder, a liquid filling valve (12), a pressure sensor (13), an oil tank (2) and an oil tank accessory, wherein the two-position four-way electromagnetic reversing valve comprises a reversing valve A (10) and a reversing valve B (26), the overflow valve comprises a main pressure overflow valve (8), a back pressure overflow valve (22), a safety overflow valve (23) and an unloading overflow valve (24), the one-way valve comprises a one-way valve A (9), a one-way valve B (20), a one-way valve C (25) and a one-way valve D (28), and the hybrid drive cylinder consists of a hybrid drive cylinder upper cavity (16), a hybrid drive cylinder piston (17), a hybrid drive cylinder direct drive member (18) and a hybrid drive cylinder lower cavity (19);

The main servo drive A is electrically connected with the numerical control system and the hydraulic main servo motor MA (1) through a lead, the direct-drive servo B is electrically connected with the numerical control system and the direct-drive servo motor MB (15) through a lead, the output end of the hydraulic main servo motor MA (1) is connected to the driving end of the oil pump (4), and the direct-drive servo motor MB (15) is used for directly driving the sliding plate to move;

The oil pump (4) oil suction port is connected with the oil tank (2), and the oil pump (4) oil suction port is located in the oil tank (2) and is connected with the oil suction filter (3), the output end of the oil pump (4) is communicated with a control oil circuit of the upper cavity (16) of the hybrid driving cylinder through a check valve D (28), a check valve A (9), a reversing valve A (10) and a liquid filling valve (12), the lower cavity (19) of the hybrid driving cylinder is communicated with the oil tank (2) through a check valve B (20), a back pressure overflow valve (22) and a safety overflow valve (23), and the upper cavity (16) of the driving cylinder is communicated with the oil pump (4) through another pipeline and an unloading overflow valve (24), a check valve C (25), a reversing valve B (26) and a check valve D (28).

2. The pump control system of the hybrid electric driving numerical control bending machine according to claim 1, wherein an input pipeline of an upper cavity (16) of the driving cylinder, an output pipeline of a lower cavity (19) of the hybrid driving cylinder and an output pipeline of the oil pump (4) are respectively provided with an M1 pressure measuring interface (14), an M2 pressure measuring interface (21) and an Mp pressure measuring interface (27), the pressure sensor (13) is arranged above the M1 pressure measuring interface (14), the pressure sensor (13) is connected with a numerical control system, and the hydraulic pressure of the real-time monitoring hydraulic system is fed back to the numerical control system.

3. The pump control system of the oil-electricity hybrid drive numerical control bending machine according to claim 1, wherein a magnetic grating ruler is connected to the outer side of a piston (17) of the hybrid drive cylinder and used for detecting the movement position and the movement speed of the oil cylinder, the magnetic grating ruler is connected with a numerical control system, and the magnetic grating ruler feeds detected signals back to the numerical control system.

4. The pump control system of the oil-electricity hybrid drive numerical control bending machine according to claim 1, wherein the oil tank accessory comprises an air filter (7), a temperature sensor (6) and a hydraulic gauge (5), the air filter (7), the temperature sensor (6) and the hydraulic gauge (5) are arranged on the outer side of the oil tank (2) and extend to the inner side of the oil tank (2), the temperature sensor (6) and the hydraulic gauge (5) are connected with a numerical control system, and the temperature sensor (6) is used for monitoring the temperature of hydraulic oil of the hydraulic system in real time and feeding back the temperature to the numerical control system.

5. The pump control system of the oil-electricity hybrid drive numerical control bending machine according to claim 1, wherein the reversing valve is connected with a numerical control system, the power-on sequence of the reversing valve is set by the numerical control system, and the main pressure overflow valve (8) is connected with the output end of the oil pump, so that the safety of main pressure is ensured.