1. The utility model provides a special four-axis servo hydraulic cushion of high accuracy examination mould hydraulic press which characterized in that: the four-axis servo hydraulic cushion special for the high-precision die testing hydraulic machine comprises a hydraulic cushion, hydraulic cushion servo oil cylinders, a hydraulic cushion oil tank, a hydraulic cushion pump set control valve block, an energy accumulator pressure sensor, a servo oil cylinder control valve block, a servo oil cylinder safety locking valve, a high-frequency response servo valve, a servo oil cylinder pressure sensor, a servo oil cylinder position sensor and a motion controller, wherein the upper part of the hydraulic cushion is connected with a mandril and a die, four corners of the bottom of the hydraulic cushion are connected with four hydraulic cushion servo oil cylinders, each hydraulic cushion servo oil cylinder is controlled by an independent servo oil cylinder control valve block, the servo oil cylinder control valve block comprises a high-frequency response servo valve and a servo oil cylinder safety locking valve, the motion controller controls the four high-frequency response servo valves, the hydraulic cushion oil tank is connected with the energy accumulator, and the hydraulic cushion pump set fills oil for the energy accumulator through the hydraulic cushion pump set control valve block, when the pressure sensor of the energy accumulator reaches the oil charging pressure, the pressure sensor of the energy accumulator sends a signal to finish the energy storage; when the pressure of the pressure sensor of the energy accumulator is low, the hydraulic cushion pump set supplies oil to the energy accumulator through the control valve block of the hydraulic cushion pump set; the safety locking valve of the servo oil cylinder is opened, and the energy accumulator supplies oil to the high-frequency response servo valve; the motion controller controls the high-frequency response servo valve to control the actions, positions and speeds of jacking and returning of the hydraulic cushion servo oil cylinder through the servo oil cylinder position sensor through coupling control; the motion controller controls the high-frequency response servo valve to respectively control the stretching pressure of the four hydraulic cushion servo oil cylinders through the servo oil cylinder pressure sensors.

2. The special four-axis servo hydraulic cushion for the high-precision die testing hydraulic machine as claimed in claim 1, wherein: the servo oil cylinder control valve block is directly installed at the bottom of the hydraulic cushion servo oil cylinder, and an energy accumulator for driving the hydraulic cushion servo oil cylinder is integrated on the servo oil cylinder control valve block.

3. The special four-axis servo hydraulic cushion for the high-precision die testing hydraulic machine as claimed in claim 1, wherein: the high-frequency-response servo valves of the four servo oil cylinder control valve blocks are four high-frequency-response servo valves with similar flow curves in the same batch.

Background

The prior art and the defects are as follows:

the trial-mold hydraulic press is mainly used for trial-production of dies and workpieces, high-end users have high requirements on positioning accuracy of four corners of a hydraulic cushion of equipment and control accuracy of tensile forces of the four corners, and the traditional hydraulic cushion is difficult to realize.

The traditional hydraulic cushion in China is in charge of ejecting and returning work through a single cylinder, the pressure of the hydraulic cushion is regulated through a PLC (programmable logic controller) control proportional valve, and high-positioning-precision and high-pressure-precision control of four corners cannot be achieved. The high-precision multi-shaft servo hydraulic cushion system in the market is monopolized by foreign companies, the purchase cost is high, and the period is long.

The difficulty and significance for solving the technical problems are as follows:

therefore, based on the problems, the four-axis servo hydraulic cushion special for the high-precision die testing hydraulic machine, which is highly integrated, achieves four-axis position leveling and position control through coupling control of the actuating controller and achieves four-axis position pressure control through independent control of the motion controller, has important practical significance.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provide a four-axis servo hydraulic cushion special for a high-precision die testing hydraulic machine, which is highly integrated, achieves four-axis position leveling and position control through coupling control of a priming controller and achieves respective control of four-axis position pressure through independent control of a motion controller.

The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:

a four-axis servo hydraulic cushion special for a high-precision die testing hydraulic machine comprises a hydraulic cushion, a hydraulic cushion servo oil cylinder, a hydraulic cushion oil tank, a hydraulic cushion pump set control valve block, an energy accumulator pressure sensor, a servo oil cylinder control valve block, a servo oil cylinder safety locking valve, a high-frequency response servo valve, a servo oil cylinder pressure sensor, a servo oil cylinder position sensor and a motion controller, wherein the upper part of the hydraulic cushion is connected with a mandril and a die, four corners of the bottom of the hydraulic cushion are connected with four hydraulic cushion servo oil cylinders, each hydraulic cushion servo oil cylinder is controlled by an independent servo oil cylinder control valve block, the servo oil cylinder control valve block comprises a high-frequency response servo valve and a servo oil cylinder safety locking valve, the motion controller controls the four high-frequency response servo valves, and the hydraulic cushion oil tank is connected with the energy accumulator, the hydraulic cushion pump set charges oil for the energy accumulator through the hydraulic cushion pump set control valve block, and when the pressure sensor of the energy accumulator reaches the oil charging pressure, the pressure sensor of the energy accumulator sends a signal to finish energy storage; when the pressure of the pressure sensor of the energy accumulator is low, the hydraulic cushion pump set supplies oil to the energy accumulator through the control valve block of the hydraulic cushion pump set; the safety locking valve of the servo oil cylinder is opened, and the energy accumulator supplies oil to the high-frequency response servo valve; the motion controller controls the high-frequency response servo valve to control the actions, positions and speeds of jacking and returning of the hydraulic cushion servo oil cylinder through the servo oil cylinder position sensor through coupling control; the motion controller controls the high-frequency response servo valve to respectively control the stretching pressure of the four hydraulic cushion servo oil cylinders through the servo oil cylinder pressure sensors.

Because the energy accumulator, the hydraulic cushion pump set control valve block and the hydraulic cushion servo oil cylinder are highly integrated, the high dynamic response frequency of the high frequency response servo valve and the motion controller is benefited, so that the servo hydraulic cushion can accurately control the position and the pressure of the hydraulic cushion, and the purposes of accurate four-corner leveling, accurate position control and accurate four-corner independent pressure control are achieved. The motion controller enables the positions of the four servo oil cylinders to keep synchronous in the static and motion processes through coupling control.

The safety locking valve of the servo oil cylinder control valve block is provided with opening and closing signal sending detection and is controlled by a host in an interlocking mode, the use safety of a hydraulic cushion is guaranteed, after the safety locking valve is opened, an energy accumulator, the valve block and the oil cylinder are integrally designed, the problem that the action of the traditional multi-plug-in control oil cylinder is slow in response is solved, the newly designed valve block directly controls the action of the oil cylinder through a motion controller through the servo valve, the response is fast, and the high-precision servo oil cylinder control valve block is specially designed for the four-axis servo hydraulic cushion special for the high-precision trial-mould hydraulic press. The high-frequency directional servo valve is directly controlled by a motion controller, and the response speed and the position pressure accuracy are much higher than those of the traditional PLC control. The motion controller independently controls the four-corner oil cylinders according to the process of the die testing hydraulic press, can achieve the control of the four-corner independent positions and the pressure (within an allowable range), realizes the pre-acceleration function, the high-precision positioning and the high repeated positioning precision, realizes the differentiated control of the four-corner positions and the pressure of various dies, has extremely wide application range of the debugging die, has high forming quality of workpieces, and avoids the repeated debugging of the dies.

The invention can also adopt the following technical scheme:

in the four-axis servo hydraulic pad special for the high-precision die testing hydraulic machine, further, the servo oil cylinder control valve block is directly installed at the bottom of the hydraulic pad servo oil cylinder, and an energy accumulator driving the hydraulic pad servo oil cylinder is integrated on the servo oil cylinder control valve block.

The control response is faster due to the elimination of the plumbing connections.

In the four-axis servo hydraulic cushion special for the high-precision die testing hydraulic machine, further, the high-frequency-response servo valves of the four servo oil cylinder control valve blocks are four high-frequency-response servo valves with similar flow curves in the same batch.

The hydraulic cushion has the advantages of safety, reliability, extremely high control precision and synchronization performance, and the purposes of leveling and accurately positioning the four corners of the whole servo hydraulic cushion and independently controlling the pressure of the four corners at high precision are achieved.

In conclusion, the invention has the following advantages and positive effects:

1. the invention adopts the design idea of high integration of a power source, a hydraulic control mechanism, an electric control mechanism and an actuating mechanism, namely the integrated design of an energy accumulator, a control valve block and a servo oil cylinder, has the advantages of quick response, high precision and low failure rate because the pipeline connection is removed, overcomes the defects of slow response and instability of the traditional PLC control by adopting the control of an independent motion controller, and realizes the aims of four-corner leveling, precise positioning and independent high-precision control of four-corner pressure.

2. Four independent servo oil cylinders are arranged at four corners of the hydraulic cushion, a four-axis motion controller is used for combining a high-frequency response servo valve to independently control the displacement, the speed and the pressure of the four-angle oil cylinders, four-axis position leveling and position control are achieved through coupling control of the motion controller, and four-axis position pressure is achieved through independent control of the motion controller to be respectively controlled. The control capability enables the servo hydraulic cushion to meet the use requirements of various drawing dies, greatly improves the pressure control precision in the equipment drawing process, and improves the forming quality of workpieces.

3. The motion controller of the invention independently controls the displacement, the speed and the pressure of the oil cylinders at the four corners of the hydraulic cushion, is not controlled by a PLC any more, has fast response relative to the PLC, has high control precision and is not interfered by other actions of equipment. The motion controller independently controls the four-corner oil cylinders according to the process of the die testing hydraulic press, can achieve the control of the four-corner independent positions and the pressure (within an allowable range), realizes the functions of pre-acceleration, high-precision positioning and high repeated positioning precision, realizes the differential control of the four-corner positions and the pressure according to various dies, and has wide application range of debugging dies and high forming quality of workpieces.

Drawings

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.

Fig. 1 is a schematic diagram of the principle of the present invention.

In the figure:

1. the hydraulic cushion system comprises a hydraulic cushion, 2, a hydraulic cushion servo oil cylinder, 3, a hydraulic cushion oil tank, 4, a hydraulic cushion pump set, 5, a hydraulic cushion pump set control valve block, 6, an energy accumulator, 7, an energy accumulator pressure sensor, 8, a servo oil cylinder control valve block, 9, a servo oil cylinder safety locking valve, 10, a high-frequency response servo valve, 11, a servo oil cylinder pressure sensor 12, a servo oil cylinder position sensor, 13 and a motion controller.

Detailed Description

The present invention will be specifically described with reference to fig. 1.

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:

the first embodiment is as follows:

referring to fig. 1, a four-axis servo hydraulic pad special for a high-precision die testing hydraulic machine comprises a hydraulic pad 1, a hydraulic pad servo cylinder 2, a hydraulic pad oil tank 3, a hydraulic pad pump group 4, a hydraulic pad pump group control valve block 5, an energy accumulator 6, an energy accumulator pressure sensor 7, a servo cylinder control valve block 8, a servo cylinder safety locking valve 9, a high-frequency response servo valve 10, a servo cylinder pressure sensor 11, a servo cylinder position sensor 12 and a motion controller 13. Wherein: the hydraulic cushion pump group 4 charges oil to the energy accumulator 6, after the energy accumulation of the energy accumulator 6 is completed, the servo oil cylinder safety locking valve 9 is opened, the motion controller 13 controls the high-frequency response servo valve 10 to combine with the servo oil cylinder pressure sensor 11 and the servo oil cylinder position sensor 12 to control the four hydraulic cushion servo oil cylinders 2 to act, and the purposes of four-corner leveling, accurate positioning and independent high-precision control of four-corner pressure are achieved.

The working process is as follows: after the servo hydraulic cushion motor is started, and the motion controller 13 finishes self-checking, the hydraulic cushion pump set 4 charges oil for the energy accumulator 6 through the hydraulic cushion pump set control valve block 5, and the energy accumulator pressure sensor 7 sends a signal to finish energy storage when the oil charging pressure is reached; when the pressure of the energy accumulator pressure sensor 7 is low, the hydraulic cushion pump set 4 supplies oil for the energy accumulator 6 through the hydraulic cushion pump set control valve block 5. The servo cylinder safety locking valve 9 is opened, the energy accumulator 6 supplies oil to the high-frequency response servo valve 10, the motion controller 13 controls the high-frequency response servo valve 10 to control the actions, positions and speeds of jacking and returning of the hydraulic cushion servo cylinder 2 through the servo cylinder position sensor 12, and the motion controller 13 enables the positions of the four servo cylinders to be kept synchronous in the static and motion processes through coupling control. The motion controller 13 controls the high-frequency response servo valve 10 to respectively control the stretching pressure of the four hydraulic cushion servo cylinders 2 through the servo cylinder pressure sensors 11. Because the energy accumulator 6, the hydraulic cushion pump set control valve block 5 and the hydraulic cushion servo oil cylinder 2 are highly integrated, the high dynamic response frequency of the high frequency response servo valve 10 and the motion controller 13 is benefited, so that the servo hydraulic cushion can accurately control the position and the pressure of the hydraulic cushion, and the purposes of accurate four-corner leveling, accurate position control and accurate four-corner independent pressure control are achieved.

In conclusion, the four-axis servo hydraulic cushion special for the high-precision die testing hydraulic machine is highly integrated, achieves four-axis position leveling and position control through coupling control of the actuating controller, and achieves four-axis position pressure control through independent control of the motion controller.

The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.