A voltage stabilizing and pressurizing mechanism and an ultra-high pressure servo-controlled thrust oil source system

Abstract

The present invention discloses a voltage stabilizing and pressurizing mechanism and an ultra-high pressure servo-controlled thrust oil source system, belonging to the technical field of hydraulic control. The voltage stabilizing and pressurizing mechanism includes a servo drive device, a ball screw, a double-row thrust bearing, a piston and a cylinder barrel. In the voltage stabilizing and pressurizing mechanism of the present invention, a ball screw is provided for voltage stabilizing and pressurizing, which can reduce pressure fluctuations and improve control accuracy. Based on this voltage stabilizing and pressurizing mechanism, the present invention also provides an ultra-high pressure servo-controlled thrust oil source system, which uses two voltage stabilizing and pressurizing mechanisms to operate alternately to achieve continuous pressurization and voltage stabilizing output with infinite volume.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control, and particularly to a pressure stabilizing and pressurizing mechanism and an ultra-high pressure servo control thrust oil source system. Background Art

[0002] According to the pressure level classification of pressure vessel specifications, it is divided into low pressure, medium pressure, high pressure, and ultra-high pressure. The pressure range of ultra-high pressure is ≥ 100 MPa. The existing ultra-high pressure hydraulic pressurization systems are usually divided into ultra-high pressure large flow rate piston pump systems. Due to the structural characteristics of the piston pump itself, the pressure fluctuation of the large flow rate piston pump system is very large, and the pressure stability is usually 3% F.S - 5% F.S, and it is impossible to achieve precise control with an accuracy of 0.5% F.S or even above 0.5% F.S. Summary of the Invention

[0003] The purpose of the present invention is to provide a pressure stabilizing and pressurizing mechanism and an ultra-high pressure servo control thrust oil source system to reduce pressure fluctuation and improve control accuracy.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The present invention provides a pressure stabilizing and pressurizing mechanism, which includes a servo drive device, a ball screw, a double-row thrust bearing, a piston, and a cylinder barrel;

[0006] The servo drive device is connected to one end of the ball screw, the other end of the ball screw is connected to one end of the piston through the double-row thrust bearing, and the other end of the piston extends into the cylinder barrel.

[0007] Optionally, the servo drive device includes a servo motor, a planetary reducer, and a turbine reducer;

[0008] The output shaft of the servo motor is connected to the planetary reducer, the planetary reducer is connected to the turbine reducer, and the turbine reducer is connected to one end of the ball screw.

[0009] Optionally, a sealing sleeve is arranged at the position where the piston of the cylinder barrel extends in;

[0010] The sealing sleeve sequentially includes a first copper ring, a combined sealing ring, and a second copper ring from the inside to the outside.

[0011] Optionally, a piston guiding device is arranged between the double-row thrust bearing and the cylinder barrel;

[0012] The piston guiding device is arranged outside the piston and is used to limit the circumferential movement of the piston.

[0013] Optionally, the voltage stabilizing and pressurizing mechanism further includes: a driving mechanism mounting plate, a lead screw mounting plate, and a plurality of guide rods connected between the driving mechanism mounting plate and the lead screw mounting plate;

[0014] The servo drive device is disposed on one side of the driving mechanism mounting plate, and one end of the ball screw passes through the driving mechanism mounting plate from the other side of the driving mechanism mounting plate and is connected to the servo drive device;

[0015] The double-row thrust bearing is disposed on one side of the lead screw mounting plate, and the other end of the ball screw passes through the lead screw mounting plate from the other side of the lead screw mounting plate and is connected to the double-row thrust bearing.

[0016] A super-high pressure servo-controlled thrust oil source system, the system includes two of the above-mentioned voltage stabilizing and pressurizing mechanisms, namely a first voltage stabilizing and pressurizing mechanism and a second voltage stabilizing and pressurizing mechanism, and the system further includes a water tank, a PLC electrical control system, a first oil control valve group and a second oil control valve group;

[0017] The first voltage stabilizing and pressurizing mechanism is connected to the water tank and the ultra-high pressure output pipeline through the first oil control valve group, and the second voltage stabilizing and pressurizing mechanism is connected to the water tank and the ultra-high pressure output pipeline through the second oil control valve group;

[0018] The PLC electrical control system is connected to the control end of the servo motor of the first voltage stabilizing and pressurizing mechanism, the control end of the servo motor of the second voltage stabilizing and pressurizing mechanism, the control end of the first oil control valve group and the control end of the second oil control valve group;

[0019] The PLC electrical control system is used to control the first voltage stabilizing and pressurizing mechanism and the second voltage stabilizing and pressurizing mechanism to work alternately.

[0020] Optionally, the first oil control valve group includes a first automatic water supply valve, a first automatic output valve, and a first automatic pressure reducing valve; the second oil control valve group includes a second automatic water supply valve, a second automatic output valve, and a second automatic pressure reducing valve;

[0021] The first automatic water supply valve is disposed on the water inlet pipeline of the cylinder of the first voltage stabilizing and pressurizing mechanism;

[0022] The first automatic output valve is disposed on the water outlet pipeline of the cylinder of the first voltage stabilizing and pressurizing mechanism;

[0023] The first automatic pressure reducing valve is disposed on the drain pipeline of the cylinder of the first voltage stabilizing and pressurizing mechanism;

[0024] The control ends of the first automatic water supply valve, the first automatic output valve, and the first automatic pressure reducing valve are all connected to the PLC electrical control system;

[0025] The second automatic water supply valve is arranged on the water inlet pipeline of the cylinder of the second pressure stabilizing and pressurizing mechanism;

[0026] The second automatic output valve is arranged on the water outlet pipeline of the cylinder of the second pressure stabilizing and pressurizing mechanism;

[0027] The second automatic pressure reducing valve is arranged on the drain pipeline of the cylinder of the second pressure stabilizing and pressurizing mechanism;

[0028] The control end of the second automatic water supply valve, the control end of the second automatic output valve and the control end of the second automatic pressure reducing valve are all connected to the PLC electrical control system.

[0029] Optionally, the system further includes a host computer, and a first water level sensor, a second water level sensor, a first pressure sensor, a second pressure sensor, a first displacement sensor and a second displacement sensor connected to the host computer;

[0030] The first water level sensor and the first pressure sensor are both arranged inside the cylinder of the first pressure stabilizing and pressurizing mechanism, and are respectively used for detecting the water level and water pressure inside the cylinder of the first pressure stabilizing and pressurizing mechanism;

[0031] The first displacement sensor is arranged at the other end of the piston of the first pressure stabilizing and pressurizing mechanism, and is used for detecting the stroke of the piston of the first pressure stabilizing and pressurizing mechanism;

[0032] The second water level sensor and the second pressure sensor are both arranged inside the cylinder of the second pressure stabilizing and pressurizing mechanism, and are respectively used for detecting the water level and water pressure inside the cylinder of the second pressure stabilizing and pressurizing mechanism;

[0033] The second displacement sensor is arranged at the other end of the piston of the second pressure stabilizing and pressurizing mechanism, and is used for detecting the stroke of the piston of the second pressure stabilizing and pressurizing mechanism;

[0034] The host computer is connected to the PLC electrical control system;

[0035] The host computer is used to receive user instructions and generate water supply instructions. When the water level in the cylinder of the first voltage-stabilizing and pressurizing mechanism reaches the water level limit, a first pressurizing instruction is generated. When the water pressure in the cylinder of the first voltage-stabilizing and pressurizing mechanism reaches the first pressure threshold, a first deceleration instruction is generated. When the water pressure in the cylinder of the first voltage-stabilizing and pressurizing mechanism reaches the second pressure threshold, a first voltage-stabilizing and pressurizing instruction or a first shutdown and pressure-holding instruction is generated. When the stroke of the piston of the second voltage-stabilizing and pressurizing mechanism reaches the stroke threshold, a first voltage-stabilizing and pressurizing instruction is generated; when the water level in the cylinder of the second voltage-stabilizing and pressurizing mechanism reaches the water level limit, a second pressurizing instruction is generated. When the water pressure in the cylinder of the second voltage-stabilizing and pressurizing mechanism reaches the first pressure threshold, a second deceleration instruction is generated. When the water pressure in the cylinder of the second voltage-stabilizing and pressurizing mechanism reaches the second pressure threshold, a second shutdown and pressure-holding instruction is generated. When the stroke of the piston of the first voltage-stabilizing and pressurizing mechanism reaches the stroke threshold, a second voltage-stabilizing and pressurizing instruction is generated.

[0036] Optionally, in terms of controlling the alternating operation of the first voltage-stabilizing and pressurizing mechanism and the second voltage-stabilizing and pressurizing mechanism, the PLC electrical control system is specifically used for:

[0037] When receiving the water supply instruction, control the first automatic water supply valve to open, control the first automatic pressurizing valve to close, and reverse-start the servo motor of the first voltage-stabilizing and pressurizing mechanism;

[0038] When receiving the first pressurizing instruction, control the first automatic water supply valve to close, control the first automatic pressurizing valve to close, forward-start the servo motor of the first voltage-stabilizing and pressurizing mechanism, and control the servo motor of the first voltage-stabilizing and pressurizing mechanism to run at full speed;

[0039] When receiving the first deceleration instruction, control the first automatic water supply valve to close, control the first automatic pressurizing valve to close, forward-start the servo motor of the first voltage-stabilizing and pressurizing mechanism, and control the servo motor of the first voltage-stabilizing and pressurizing mechanism to run at a decelerated speed;

[0040] When receiving the first voltage-stabilizing and pressurizing instruction, control the first automatic water supply valve to close, control the first automatic pressurizing valve to open, forward-start the servo motor of the first voltage-stabilizing and pressurizing mechanism, control the servo motor of the first voltage-stabilizing and pressurizing mechanism to run at full speed, and at the same time control the second automatic water supply valve to open and reverse-start the servo motor of the second voltage-stabilizing and pressurizing mechanism. When the piston of the first voltage-stabilizing and pressurizing mechanism runs to the limit position, control the first automatic pressurizing valve to close and control the servo motor of the first voltage-stabilizing and pressurizing mechanism to stop working;

[0041] When receiving the second pressurizing instruction, control the second automatic water supply valve to close, control the second automatic pressurizing valve to close, forward-start the servo motor of the second voltage-stabilizing and pressurizing mechanism, and control the servo motor of the second voltage-stabilizing and pressurizing mechanism to run at full speed;

[0042] When receiving the second deceleration instruction, control the second automatic water supply valve to close, control the second automatic pressurizing valve to close, start the servo motor of the second pressure stabilizing and pressurizing mechanism in the forward direction, and control the servo motor of the second pressure stabilizing and pressurizing mechanism to operate at a reduced speed;

[0043] When receiving the second shutdown and pressure holding instruction, control the second automatic pressurizing valve to close, control the second automatic water supply valve to close, and control the servo motor of the second pressure stabilizing and pressurizing mechanism to stop;

[0044] When receiving the second pressure stabilizing and pressurizing instruction, control the second automatic water supply valve to close, control the second automatic pressurizing valve to open, start the servo motor of the second pressure stabilizing and pressurizing mechanism in the forward direction, control the servo motor of the second pressure stabilizing and pressurizing mechanism to operate at full speed, and at the same time control the first automatic water supply valve to open, start the servo motor of the first pressure stabilizing and pressurizing mechanism in the reverse direction, and when the piston of the second pressure stabilizing and pressurizing mechanism runs to the limit position, control the second automatic pressurizing valve to close and control the servo motor of the second pressure stabilizing and pressurizing mechanism to stop;

[0045] When receiving the first shutdown and pressure holding instruction, control the first automatic pressurizing valve to close, control the first automatic water supply valve to close, and control the servo motor of the first pressure stabilizing and pressurizing mechanism to stop.

[0046] Optionally, the first automatic water supply valve, the first automatic output valve, the first automatic pressure reducing valve, the second automatic water supply valve, the second automatic output valve, and the second automatic pressure reducing valve all adopt ultra-high pressure hydraulic control globe valves.

[0047] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0048] The embodiment of the present invention provides a pressure stabilizing and pressurizing mechanism and an ultra-high pressure servo control thrust oil source system. The pressure stabilizing and pressurizing mechanism includes a servo drive device, a ball screw, a double-row thrust bearing, a piston, and a cylinder barrel. In the pressure stabilizing and pressurizing mechanism of the present invention, a ball screw is provided for pressure stabilizing and pressurizing, which can reduce pressure fluctuations and improve control accuracy. Based on this pressure stabilizing and pressurizing mechanism, the present invention also provides an ultra-high pressure servo control thrust oil source system, which uses two pressure stabilizing and pressurizing mechanisms to operate alternately to achieve continuous pressurization and pressure stabilizing output with infinite volume. Description of the Drawings

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1Schematic diagram of the structural principle of the voltage stabilizing and pressure boosting mechanism provided by the embodiment of the present invention;

[0051] Figure 2 External structure diagram of the voltage stabilizing and pressure boosting mechanism provided by the embodiment of the present invention;

[0052] Figure 3 Composition block diagram of the ultra-high pressure servo control thrust oil source system provided by the embodiment of the present invention;

[0053] Figure 4 Power supply schematic diagram of the PLC electrical control system provided by the embodiment of the present invention;

[0054] Figure 5 Circuit connection schematic diagram of the PLC electrical control system provided by the embodiment of the present invention;

[0055] Figure 6 Oil circuit control diagram of the first oil control valve group and the second oil control valve group provided by the embodiment of the present invention;

[0056] Figure 7 Structural schematic diagram of the ultra-high pressure hydraulic control check valve provided by the embodiment of the present invention. Detailed implementation manners

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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, rather than all 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.

[0058] The purpose of the present invention is to provide a voltage stabilizing and pressure boosting mechanism and an ultra-high pressure servo control thrust oil source system to reduce pressure fluctuations and improve control accuracy.

[0059] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0060] The embodiment of the present invention provides a voltage stabilizing and pressure boosting mechanism, such as Figure 1 and Figure 2As shown in the figure, the voltage stabilizing and pressurizing mechanism includes: a servo drive device, a ball screw, a double-row thrust bearing, a piston and a cylinder barrel; the servo drive device is connected to one end of the ball screw, and the other end of the ball screw is connected to one end of the piston through the double-row thrust bearing, and the other end of the piston extends into the cylinder barrel. Among them, the servo drive device includes a servo motor, a planetary reducer and a turbine reducer; the output shaft of the servo motor is connected to the planetary reducer, the planetary reducer is connected to the turbine reducer, and the turbine reducer is connected to one end of the ball screw. A sealing sleeve is arranged at the position where the piston of the cylinder barrel extends in; the sealing sleeve sequentially includes a first copper ring, a combined sealing ring and a second copper ring from the inside to the outside. A piston guiding device is arranged between the double-row thrust bearing and the cylinder barrel; the piston guiding device is arranged outside the piston and is used to limit the circumferential movement of the piston. The voltage stabilizing and pressurizing mechanism further includes a drive mechanism mounting plate, a screw mounting plate and a plurality of guide rods connected between the drive mechanism mounting plate and the screw mounting plate; the servo drive device is arranged on one side of the drive mechanism mounting plate, and one end of the ball screw passes through the drive mechanism mounting plate from the other side of the drive mechanism mounting plate and is connected to the servo drive device; the double-row thrust bearing is arranged on one side of the screw mounting plate, and the other end of the ball screw passes through the screw mounting plate from the other side of the screw mounting plate and is connected to the double-row thrust bearing.

[0061] In the voltage stabilizing and pressurizing mechanism provided by the embodiment of the present invention, the servo motor converts electrical energy into rotational motion mechanical energy. The rotational motion is amplified in torque by a precision low-backlash planetary reducer and a turbine reducer. The output shaft of the turbine reducer is connected to the ball screw, and the rotational motion is converted into the linear motion of the ball screw through the ball screw. The other end of the ball screw is connected to the piston of the cylinder barrel through a double-row thrust bearing, and the piston enters or exits the cylinder barrel through the linear movement of the ball screw, achieving the effect of increasing or decreasing the pressure of the medium in the cylinder barrel. The turbine reducer in the torque amplification mechanism has a self-locking characteristic, enabling the pressure in the cylinder barrel to be maintained stable under certain conditions when the motor is not working.

[0062] The servo motor is connected to the planetary reducer and then to the turbine reducer. The turbine reducer is installed on the drive mechanism mounting plate. The output torque of the turbine reducer is transmitted to the precision-ground ball screw. The ball screw nut is fixed on the screw mounting plate. The rotational motion output by the turbine reducer is converted into the rotational and linear motion of the precision-ground ball screw through the screw. The ball screw is connected to the piston of the hydraulic system through a double-row thrust bearing, enabling the piston to achieve linear motion and pressure relief.

[0063] In the embodiment of the present invention, the precision-ground ball screw selected has higher precision, smaller clearance, and higher strength compared with the conventional rolled screw, which is beneficial to achieving precise positioning. During the linear motion of the ball screw back and forth, the guide rod is guided by an oil-impregnated graphite bronze bushing, which has the advantages of large bearing capacity and small friction.

[0064] Embodiment 2

[0065] Embodiment 2 of the present invention provides an ultra-high pressure servo-controlled thrust oil source system, as Figure 3 shown. The system includes two of the above-mentioned voltage stabilizing and pressurizing mechanisms, namely the first voltage stabilizing and pressurizing mechanism (i.e., Figure 3 the voltage stabilizing and pressurizing mechanism A in Figure 3 ) and the second voltage stabilizing and pressurizing mechanism (i.e., Figure 4 shown). The system further includes a water tank, a PLC electrical control system, a first oil control valve group, and a second oil control valve group. The first voltage stabilizing and pressurizing mechanism is connected to the water tank and the ultra-high pressure output pipeline through the first oil control valve group, and the second voltage stabilizing and pressurizing mechanism is connected to the water tank and the ultra-high pressure output pipeline through the second oil control valve group. The PLC electrical control system is connected to the control ends of the servo motors of the first voltage stabilizing and pressurizing mechanism, the control ends of the servo motors of the second voltage stabilizing and pressurizing mechanism, the control end of the first oil control valve group, and the control end of the second oil control valve group. The PLC electrical control system is used to control the first voltage stabilizing and pressurizing mechanism and the second voltage stabilizing and pressurizing mechanism to work alternately, and its electrical connection relationship is as Figure 3 shown. Among them, the first oil control valve group includes a first automatic water supply valve, a first automatic output valve, and a first automatic pressure reducing valve. The second oil control valve group includes a second automatic water supply valve, a second automatic output valve, and a second automatic pressure reducing valve. The first automatic water supply valve is arranged on the water inlet pipeline of the cylinder barrel of the first voltage stabilizing and pressurizing mechanism (i.e., Figure 3 the position of the automatic valve water supply A in Figure 3 ). The first automatic output valve is arranged on the water outlet pipeline of the cylinder barrel of the first voltage stabilizing and pressurizing mechanism (i.e., Figure 3 the position of the automatic valve output A in Figure 3 ). The first automatic pressure reducing valve is arranged on the drain pipeline of the cylinder barrel of the first voltage stabilizing and pressurizing mechanism (i.e., the position of the automatic valve pressure reducing A in Figure 3 , and this first automatic pressure reducing valve is opened when emptying or cleaning the cylinder barrel of the first voltage stabilizing and pressurizing mechanism). The control ends of the first automatic water supply valve, the first automatic output valve, and the first automatic pressure reducing valve are all connected to the PLC electrical control system. The second automatic water supply valve is arranged on the water inlet pipeline of the cylinder barrel of the second voltage stabilizing and pressurizing mechanism (i.e., Figure 3 the position of the automatic valve water supply B in Figure 3 ). The second automatic output valve is arranged on the water outlet pipeline of the cylinder barrel of the second voltage stabilizing and pressurizing mechanism (i.e.,Figure 3 The position of the automatic valve B for pressure reduction in Figure 3 , and this second automatic pressure reduction valve is opened when evacuating or cleaning the cylinder barrel of the second constant pressure and pressurization mechanism); the control ends of the second automatic water supply valve, the second automatic output valve, and the second automatic pressure reduction valve are all connected to the PLC electrical control system. Among them, the water inlet pipelines of the cylinder barrels of the first constant pressure and pressurization mechanism and the second constant pressure and pressurization mechanism are both ultra-high pressure pipelines.

[0066] The system provided by the embodiment of the present invention further includes a host computer, and a first water level sensor, a second water level sensor, a first pressure sensor, a second pressure sensor, a first displacement sensor, and a second displacement sensor connected to the host computer; the first water level sensor and the first pressure sensor are both arranged inside the cylinder barrel of the first constant pressure and pressurization mechanism, and are respectively used to detect the water level and water pressure inside the cylinder barrel of the first constant pressure and pressurization mechanism; the first displacement sensor is arranged at the other end of the piston of the first constant pressure and pressurization mechanism, and is used to detect the stroke of the piston of the first constant pressure and pressurization mechanism; the second water level sensor and the second pressure sensor are both arranged inside the cylinder barrel of the second constant pressure and pressurization mechanism, and are respectively used to detect the water level and water pressure inside the cylinder barrel of the second constant pressure and pressurization mechanism; the second displacement sensor is arranged at the other end of the piston of the second constant pressure and pressurization mechanism, and is used to detect the stroke of the piston of the second constant pressure and pressurization mechanism; the host computer is connected to the PLC electrical control system; the host computer is used to generate control instructions based on the signals detected by each sensor and user instructions and send them to the PLC electrical control system. The specific control process is as follows:

[0067] Before work, fill the water tank with water (or other liquids) to make preparations before work. The piston of the constant pressure and pressurization mechanism is in the deepest position inside the cylinder barrel. At this time, the water volume inside the cylinder barrel is in the minimum volume state. When pressurization is required, start the oil pump. The control system of the host computer (or touch screen), hereinafter referred to as the host computer, sends a water supply instruction to the PLC electrical control system, opens the first automatic water supply valve, starts the servo motor of the first constant pressure and pressurization mechanism to rotate in reverse. The servo motor of the first constant pressure and pressurization mechanism rotates and drives the lead screw through the reducer to drive the piston to retract, so that the water in the water tank enters the cylinder barrel of the first constant pressure and pressurization mechanism. After the host computer detects that the cylinder barrel of the first constant pressure and pressurization mechanism is filled with water, it generates a pressurization instruction and sends it to the PLC electrical control system. The PLC electrical control system sends a forward rotation instruction to the servo motor of the first constant pressure and pressurization mechanism to rotate forward, closes the first automatic water supply valve, and opens the first automatic output valve. When the host computer monitors that the control pressure reaches 80% of the pressure value set by the host computer, it generates a first deceleration instruction and sends it to the PLC electrical control system. At this time, the servo motor of the first constant pressure and pressurization mechanism gradually slows down the running speed until the pressure reaches 100% of the pressure set value. At this time, continuously pressurize and stabilize the pressure of the container to be pressurized until the stroke of the first constant pressure and pressurization mechanism runs to the limit position.

[0068] While the cylinder of the first pressure stabilizing and boosting mechanism is being pressurized, the host computer control system sends an instruction to the PLC electrical control system to open the second automatic water supply valve, and at the same time sends an instruction to start the reverse rotation of the servo motor of the second pressure stabilizing and boosting mechanism. The motor rotates and drives the ball screw through the speed reducer to drive the piston to retract, so that the water in the water tank enters the cylinder of the second pressure stabilizing and boosting mechanism. After the host computer detects that the cylinder of the second pressure stabilizing and boosting mechanism is filled with water, it sends a second pressurization instruction to the PLC electrical control system. The PLC sends a forward rotation instruction to the servo motor of the second pressure stabilizing and boosting mechanism to rotate forward, closes the second automatic water supply valve, and closes the second automatic output valve. When the host computer monitors that the pressure in cylinder B reaches 80% of the pressure set value by the host computer, the host computer sends a second deceleration operation instruction. At this time, the servo motor runs slowly until the pressure reaches 100% of the pressure set value. The host computer sends a shutdown and pressure holding instruction to the PLC electrical control system, and the second pressure stabilizing and boosting mechanism shuts down and holds pressure, waiting for pressurization output. When the first pressure stabilizing and boosting mechanism runs to 95% of the total stroke, the host computer sends a second pressurization and pressure stabilizing instruction to the PLC electrical control system, opens the second automatic water supply valve, and closes the first automatic water supply valve. At this time, the second pressure stabilizing and boosting mechanism performs pressurization. The pressure stabilizing and boosting mechanism enters the water filling and pressure preparation stage. In this way, it alternates repeatedly to achieve continuous pressurization and pressure stabilization output with infinite volume.

[0069] Specifically, the host computer executes the following process:

[0070] When receiving a user instruction and generating a water supply instruction, when the water level in the cylinder of the first pressure stabilizing and boosting mechanism reaches the water level limit value, a first pressurization instruction is generated. When the water pressure in the cylinder of the first pressure stabilizing and boosting mechanism reaches the first pressure threshold value, a first deceleration instruction is generated. When the water pressure in the cylinder of the first pressure stabilizing and boosting mechanism reaches the second pressure threshold value, a first pressure stabilizing and boosting instruction or a first shutdown and pressure holding instruction is generated. When the stroke of the piston of the second pressure stabilizing and boosting mechanism reaches the stroke threshold value, a first pressure stabilizing and boosting instruction is generated; when the water level in the cylinder of the second pressure stabilizing and boosting mechanism reaches the water level limit value, a second pressurization instruction is generated. When the water pressure in the cylinder of the second pressure stabilizing and boosting mechanism reaches the first pressure threshold value, a second deceleration instruction is generated. When the water pressure in the cylinder of the second pressure stabilizing and boosting mechanism reaches the second pressure threshold value, a second shutdown and pressure holding instruction is generated. When the stroke of the piston of the first pressure stabilizing and boosting mechanism reaches the stroke threshold value, a second pressure stabilizing and boosting instruction is generated.

[0071] The PLC electrical control system executes the following process:

[0072] When a water supply instruction is received, control the first automatic water supply valve to open, control the first automatic pressure boosting valve to close, and reverse-start the servo motor of the first constant pressure boosting mechanism; when a first pressure boosting instruction is received, control the first automatic water supply valve to close, control the first automatic pressure boosting valve to close, forward-start the servo motor of the first constant pressure boosting mechanism, and control the servo motor of the first constant pressure boosting mechanism to run at full speed; when a first deceleration instruction is received, control the first automatic water supply valve to close, control the first automatic pressure boosting valve to close, forward-start the servo motor of the first constant pressure boosting mechanism, and control the servo motor of the first constant pressure boosting mechanism to decelerate; when a first constant pressure boosting instruction is received, control the first automatic water supply valve to close, control the first automatic pressure boosting valve to open, forward-start the servo motor of the first constant pressure boosting mechanism, control the servo motor of the first constant pressure boosting mechanism to run at full speed, simultaneously control the second automatic water supply valve to open, reverse-start the servo motor of the second constant pressure boosting mechanism, and when the piston of the first constant pressure boosting mechanism runs to the limit position, control the first automatic pressure boosting valve to close and control the servo motor of the first constant pressure boosting mechanism to stop working; when a second pressure boosting instruction is received, control the second automatic water supply valve to close, control the second automatic pressure boosting valve to close, forward-start the servo motor of the second constant pressure boosting mechanism, and control the servo motor of the second constant pressure boosting mechanism to run at full speed; when a second deceleration instruction is received, control the second automatic water supply valve to close, control the second automatic pressure boosting valve to close, forward-start the servo motor of the second constant pressure boosting mechanism, and control the servo motor of the second constant pressure boosting mechanism to decelerate; when a second shutdown and pressure maintenance instruction is received, control the second automatic pressure boosting valve to close, control the second automatic water supply valve to close, and control the servo motor of the second constant pressure boosting mechanism to shut down; when a second constant pressure boosting instruction is received, control the second automatic water supply valve to close, control the second automatic pressure boosting valve to open, forward-start the servo motor of the second constant pressure boosting mechanism, control the servo motor of the second constant pressure boosting mechanism to run at full speed, simultaneously control the first automatic water supply valve to open, reverse-start the servo motor of the first constant pressure boosting mechanism, and when the piston of the second constant pressure boosting mechanism runs to the limit position, control the second automatic pressure boosting valve to close and control the servo motor of the second constant pressure boosting mechanism to shut down; when a first shutdown and pressure maintenance instruction is received, control the first automatic pressure boosting valve to close, control the first automatic water supply valve to close, and control the servo motor of the first constant pressure boosting mechanism to shut down.

[0073] This system has the ability of long-term precise voltage stabilization. During the voltage stabilization process, due to no change or no change in flow, the upper computer control system sends instructions to the PLC electrical control system, and the servo motors of the first constant pressure boosting mechanism and the first constant pressure boosting mechanism are in the shutdown state without consuming energy, making the system more energy-saving and environmentally friendly during use.

[0074] Such as Figure 5As shown in the figure, the PLC electrical control system provided by the embodiments of the present invention is configured with a touch control screen, a 24V power supply, a PLC, an expansion module, a servo controller, and corresponding pressure monitoring sensors, displacement monitoring sensors, and travel limit alarm controllers. It can be connected to a computer control system for upper computer control, or the touch screen can be used to disconnect from the computer to execute control. It can automatically and cyclically collect the pressure values of each pressure sensor and compare them with the upper and lower limit values of the preset pressure for each section, indicating that the PLC electrical control system implements automatic control of the servo motor and solenoid valve. For example, when the cylinder pressure value is lower than the preset pressure lower limit value, the system automatically instructs the PLC to control the servo motor to start automatically, and when it is higher than the upper limit value, the motor automatically adjusts in the reverse direction; when the pressure maintaining container needs to be loaded, the servo motor automatically starts to pressurize to provide sufficient pressure, and when the pressure maintaining container reaches the set pressure value, the servo motor automatically shuts down, and reciprocates to realize the pressurization and pressure stabilization hydraulic circuit of the container, so as to realize the automatic control of the medium pressure in the pressure maintaining container.

[0075] As Figure 6 and Figure 7 As shown in the figure, both the first oil control valve group and the second oil control valve group in the embodiments of the present invention adopt ultra-high pressure hydraulic control check valves, which are composed of hydraulic components such as proportional valves, directional control valves, pump stations, motors, accumulators, relief valves, and pressure transmitters. After the hydraulic pump station supplies oil, the clean oil is filtered through the outlet oil filter and passes through the one-way valve and electromagnetic valve to be pressure stabilized by the accumulator. The oil is controlled by the input solenoid valve, step-down solenoid valve, and water supply solenoid valve to realize the on-off of the oil, and the opening or closing of the output valve, step-down valve, and water supply valve is realized to control the on-off of the ultra-high pressure hydraulic circuit.

[0076] Principle of the ultra-high pressure hydraulic control check valve: The control oil cylinder and valve body are both installed on the valve plate. The linear movement of the oil cylinder piston is realized by the control of the low-pressure hydraulic pump station system, low-pressure solenoid valve and other systems. The piston rod of the oil cylinder is connected to the upper valve rod by a thread, and the upper valve rod and the lower valve rod are in spherical contact and stressed. During operation, the linear movement of the lower valve rod is realized by the movement of the piston, and the sealing between the lower valve rod and the valve body is completed to realize the cut-off and circulation of the fluid medium.

[0077] The advantages of the ultra-high pressure hydraulic control check valve in the embodiments of the present invention are as follows:

[0078] 1. The conical surface metal hard seal is adopted, which is applicable to high pressures, and the current operating pressure can reach 300 MPa.

[0079] 2. The sectional spherical connection valve rod is adopted, which can automatically align the center and has good force-bearing sealing performance.

[0080] 3. The valve is made of high-strength stainless steel and its surface is strengthened, which can be applicable to various media such as water, steam, and oil, and has good corrosion resistance.

[0081] According to the specific embodiments provided by the present invention, the following technical effects of the present invention are disclosed:

[0082] An embodiment of the present invention provides a voltage stabilizing and pressurizing mechanism and an ultra-high pressure servo-controlled thrust oil source system. The voltage stabilizing and pressurizing mechanism includes a servo drive device, a ball screw, a double-row thrust bearing, a piston, and a cylinder barrel. In the voltage stabilizing and pressurizing mechanism of the present invention, a ball screw is provided for voltage stabilizing and pressurizing to achieve pressure, which can reduce pressure fluctuations and improve control accuracy. Based on this voltage stabilizing and pressurizing mechanism, the present invention also provides an ultra-high pressure servo-controlled thrust oil source system, which uses two voltage stabilizing and pressurizing mechanisms to operate alternately to achieve continuous pressurization and voltage stabilization output with infinite volume.

[0083] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0084] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A super-high pressure servo-controlled thrust oil source system, characterized in that, The system includes two pressure stabilizing and boosting mechanisms, namely the first pressure stabilizing and boosting mechanism and the second pressure stabilizing and boosting mechanism. The system also includes a water tank, a PLC electrical control system, a first oil control valve group and a second oil control valve group; The first pressure stabilizing and boosting mechanism is connected to the water tank and the ultra-high pressure output pipeline through the first oil control valve group, and the second pressure stabilizing and boosting mechanism is connected to the water tank and the ultra-high pressure output pipeline through the second oil control valve group; The PLC electrical control system is connected to the control end of the servo motor of the first pressure stabilizing and boosting mechanism, the control end of the servo motor of the second pressure stabilizing and boosting mechanism, the control end of the first oil control valve group and the control end of the second oil control valve group; The PLC electrical control system is used to control the first pressure stabilizing and boosting mechanism and the second pressure stabilizing and boosting mechanism to work alternately; The system also includes a host computer, and a first water level sensor, a second water level sensor, a first pressure sensor, a second pressure sensor, a first displacement sensor and a second displacement sensor connected to the host computer; The first water level sensor and the first pressure sensor are both arranged in the cylinder barrel of the first pressure stabilizing and boosting mechanism, and are respectively used to detect the water level and water pressure in the cylinder barrel of the first pressure stabilizing and boosting mechanism; The first displacement sensor is arranged at the other end of the piston of the first pressure stabilizing and boosting mechanism, and is used to detect the stroke of the piston of the first pressure stabilizing and boosting mechanism; The second water level sensor and the second pressure sensor are both arranged in the cylinder barrel of the second pressure stabilizing and boosting mechanism, and are respectively used to detect the water level and water pressure in the cylinder barrel of the second pressure stabilizing and boosting mechanism; The second displacement sensor is arranged at the other end of the piston of the second pressure stabilizing and boosting mechanism, and is used to detect the stroke of the piston of the second pressure stabilizing and boosting mechanism; The host computer is connected to the PLC electrical control system; The host computer is used to receive user instructions and generate a water supply instruction. When the water level in the cylinder barrel of the first pressure stabilizing and boosting mechanism reaches the water level limit value, a first pressurization instruction is generated. When the water pressure in the cylinder barrel of the first pressure stabilizing and boosting mechanism reaches the first pressure threshold value, a first deceleration instruction is generated. When the water pressure in the cylinder barrel of the first pressure stabilizing and boosting mechanism reaches the second pressure threshold value, a first pressure stabilizing and boosting instruction or a first shutdown and pressure maintaining instruction is generated. When the stroke of the piston of the second pressure stabilizing and boosting mechanism reaches the stroke threshold value, a first pressure stabilizing and boosting instruction is generated; When the water level in the cylinder barrel of the second pressure stabilizing and boosting mechanism reaches the water level limit value, a second pressurization instruction is generated. When the water pressure in the cylinder barrel of the second pressure stabilizing and boosting mechanism reaches the first pressure threshold value, a second deceleration instruction is generated. When the water pressure in the cylinder barrel of the second pressure stabilizing and boosting mechanism reaches the second pressure threshold value, a second shutdown and pressure maintaining instruction is generated. When the stroke of the piston of the first pressure stabilizing and boosting mechanism reaches the stroke threshold value, a second pressure stabilizing and boosting instruction is generated.

2. The ultra-high pressure servo-controlled thrust oil source system according to claim 1, wherein, The pressure stabilizing and boosting mechanism includes: a servo drive device, a ball screw, a double-row thrust bearing, a piston and a cylinder barrel; The servo drive device is connected to one end of the ball screw, the other end of the ball screw is connected to one end of the piston through the double-row thrust bearing, and the other end of the piston extends into the cylinder barrel.

3. The ultra-high pressure servo-controlled thrust oil source system according to claim 2, wherein, The servo drive device includes: a servo motor, a planetary reducer, and a turbine reducer; The output shaft of the servo motor is connected to the planetary reducer, the planetary reducer is connected to the turbine reducer, and the turbine reducer is connected to one end of the ball screw.

4. The ultra-high pressure servo control thrust oil source system according to claim 2, characterized in that, A sealing sleeve is provided at the position where the piston of the cylinder barrel extends in; The sealing sleeve includes a first copper ring, a combined sealing ring, and a second copper ring from the inside to the outside in sequence.

5. The ultra-high pressure servo-controlled thrust oil source system according to claim 2, characterized in that, A piston guiding device is provided between the double-row thrust bearing and the cylinder barrel; The piston guiding device is arranged outside the piston and is used to limit the circumferential movement of the piston.

6. The ultra-high pressure servo control thrust oil source system according to claim 2, wherein The voltage stabilizing and pressurizing mechanism further includes: a driving mechanism mounting plate, a lead screw mounting plate, and a plurality of guide rods connected between the driving mechanism mounting plate and the lead screw mounting plate; The servo drive device is arranged on one side of the driving mechanism mounting plate, and one end of the ball screw passes through the driving mechanism mounting plate from the other side of the driving mechanism mounting plate and is connected to the servo drive device; The double-row thrust bearing is arranged on one side of the lead screw mounting plate, and the other end of the ball screw passes through the lead screw mounting plate from the other side of the lead screw mounting plate and is connected to the double-row thrust bearing.

7. The ultra-high pressure servo control thrust oil source system according to claim 1, characterized in that, The first oil control valve group includes a first automatic water supply valve, a first automatic output valve, and a first automatic pressure reducing valve; the second oil control valve group includes a second automatic water supply valve, a second automatic output valve, and a second automatic pressure reducing valve; The first automatic water supply valve is arranged on the water inlet pipeline of the cylinder barrel of the first voltage stabilizing and pressurizing mechanism; The first automatic output valve is arranged on the water outlet pipeline of the cylinder barrel of the first voltage stabilizing and pressurizing mechanism; The first automatic pressure reducing valve is arranged on the drain pipeline of the cylinder barrel of the first voltage stabilizing and pressurizing mechanism; The control ends of the first automatic water supply valve, the first automatic output valve, and the first automatic pressure reducing valve are all connected to the PLC electrical control system; The second automatic water supply valve is arranged on the water inlet pipeline of the cylinder barrel of the second voltage stabilizing and pressurizing mechanism; The second automatic output valve is arranged on the water outlet pipeline of the cylinder barrel of the second voltage stabilizing and pressurizing mechanism; The second automatic pressure reducing valve is arranged on the drain pipeline of the cylinder barrel of the second voltage stabilizing and pressurizing mechanism; The control ends of the second automatic water supply valve, the second automatic output valve, and the second automatic pressure reducing valve are all connected to the PLC electrical control system.

8. The ultra-high pressure servo-controlled thrust oil source system according to claim 1 or 7, characterized in that, In terms of controlling the first voltage stabilizing and pressurizing mechanism and the second voltage stabilizing and pressurizing mechanism to work alternately, the PLC electrical control system is specifically used for: When receiving a water supply instruction, controlling the first automatic water supply valve to open, controlling the first automatic pressurizing valve to close, and reversely starting the servo motor of the first voltage stabilizing and pressurizing mechanism; When receiving a first pressurizing instruction, controlling the first automatic water supply valve to close, controlling the first automatic pressurizing valve to close, forwardly starting the servo motor of the first voltage stabilizing and pressurizing mechanism, and controlling the servo motor of the first voltage stabilizing and pressurizing mechanism to run at full speed; When receiving a first deceleration instruction, controlling the first automatic water supply valve to close, controlling the first automatic pressurizing valve to close, forwardly starting the servo motor of the first voltage stabilizing and pressurizing mechanism, and controlling the servo motor of the first voltage stabilizing and pressurizing mechanism to run at a decelerated speed; When receiving the first constant-pressure boosting instruction, control the first automatic water supply valve to close, control the first automatic boosting valve to open, start the servo motor of the first constant-pressure boosting mechanism in the forward direction, control the servo motor of the first constant-pressure boosting mechanism to run at full speed, and at the same time control the second automatic water supply valve to open, start the servo motor of the second constant-pressure boosting mechanism in the reverse direction, and when the piston of the first constant-pressure boosting mechanism runs to the limit position, control the first automatic boosting valve to close and control the servo motor of the first constant-pressure boosting mechanism to stop working; When receiving the second boosting instruction, control the second automatic water supply valve to close, control the second automatic boosting valve to close, start the servo motor of the second constant-pressure boosting mechanism in the forward direction, and control the servo motor of the second constant-pressure boosting mechanism to run at full speed; When receiving the second deceleration instruction, control the second automatic water supply valve to close, control the second automatic boosting valve to close, start the servo motor of the second constant-pressure boosting mechanism in the forward direction, and control the servo motor of the second constant-pressure boosting mechanism to run at a decelerated speed; When receiving the second shutdown and pressure-holding instruction, control the second automatic boosting valve to close, control the second automatic water supply valve to close, and control the servo motor of the second constant-pressure boosting mechanism to shut down; When receiving the second constant-pressure boosting instruction, control the second automatic water supply valve to close, control the second automatic boosting valve to open, start the servo motor of the second constant-pressure boosting mechanism in the forward direction, control the servo motor of the second constant-pressure boosting mechanism to run at full speed, and at the same time control the first automatic water supply valve to open, start the servo motor of the first constant-pressure boosting mechanism in the reverse direction, and when the piston of the second constant-pressure boosting mechanism runs to the limit position, control the second automatic boosting valve to close and control the servo motor of the second constant-pressure boosting mechanism to stop; When receiving the first shutdown and pressure-holding instruction, control the first automatic boosting valve to close, control the first automatic water supply valve to close, and control the servo motor of the first constant-pressure boosting mechanism to shut down.

9. The ultra-high pressure servo-controlled thrust oil source system according to claim 1, wherein The first automatic water supply valve, the first automatic output valve, the first automatic pressure-reducing valve, the second automatic water supply valve, the second automatic output valve, and the second automatic pressure-reducing valve all adopt ultra-high-pressure hydraulic control globe valves.

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