CN109723700B - Eight-shaft driven multipoint hydraulic stretching pad hydraulic system - Google Patents
Eight-shaft driven multipoint hydraulic stretching pad hydraulic system Download PDFInfo
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- CN109723700B CN109723700B CN201910021132.5A CN201910021132A CN109723700B CN 109723700 B CN109723700 B CN 109723700B CN 201910021132 A CN201910021132 A CN 201910021132A CN 109723700 B CN109723700 B CN 109723700B
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Abstract
The invention belongs to the technical field of hydraulic stretching pads, and particularly relates to an eight-axis driving multipoint hydraulic stretching pad hydraulic system. The hydraulic cylinder circuit comprises a first tensile pad hydraulic cylinder circuit, a second tensile pad hydraulic cylinder circuit, a third tensile pad hydraulic cylinder circuit, a fourth tensile pad hydraulic cylinder circuit, a fifth tensile pad hydraulic cylinder circuit, a sixth tensile pad hydraulic cylinder circuit, a seventh tensile pad hydraulic cylinder circuit, an eighth tensile pad hydraulic cylinder circuit and a main cylinder circuit. The pressure of the rodless cavity of each stretching pad hydraulic cylinder is adjusted in real time according to different stretching working conditions, so that multipoint pressure adjustment is realized, vibration is small, control precision is high, and the material flowing requirement is met. The position control precision of each stretching pad hydraulic cylinder is ensured through eight-axis cooperative control; by using the proportional cartridge overflow valve, the stable release of the rodless cavity high pressure of each stretching pad hydraulic cylinder is realized; through the use of the large-drift-diameter servo cartridge valve, the high-pressure impact-free release of the main cylinder working cavity is ensured.
Description
Technical Field
The invention belongs to the technical field of hydraulic stretching pads, and particularly relates to an eight-axis driving multipoint hydraulic stretching pad hydraulic system.
Background
With the rapid development of the automobile industry, various high-strength and composite forming materials are popularized and applied more and more in the manufacturing of automobile bodies, which puts higher requirements on the functions of the stretching pad and promotes the development of the hydraulic stretching pad technology. The hydraulic stretching pad plays an increasingly important role in improving the stretching quality and the production efficiency of products, and becomes an important component of the current stretching press. Fig. 1 is a schematic structural composition diagram of a hydraulic stretching pad, which mainly comprises: the device comprises a sliding block 1, an upper die 2, a bracket 3, a lower die 4, a hydraulic stretching pad 5, a stretching pad hydraulic cylinder 6 and a main cylinder 14. The working principle is as follows: the slide 1 pushes the upper die 2 to press the plate material 7 to be processed into the lower die, thereby forming the desired shape. However, in practice this is a very complicated process. Since the hydraulic stretching pads 5 are the relatively moving parts of the slide 1 during the forming process, their movements must be accurately coordinated to ensure accurate forming of the sheet. However, the conventional hydraulic stretching pad 5 is a two-point or four-point stretching, cannot be stretched to form a part with a complex profile, and the position and pressure of the hydraulic cylinder of the conventional stretching pad are controlled in an open loop manner, which has a serious influence on the quality of a stretched product. The pressure open loop can not realize multi-point and multi-pressure control, and the product is easy to wrinkle; the position open loop control cannot realize the accurate control of the displacement of the stretching pad hydraulic cylinder 6, thereby influencing the yield of products.
Disclosure of Invention
The invention aims to provide an eight-axis driving multipoint hydraulic stretching pad hydraulic system which can effectively overcome the defects in the prior art.
The invention is realized by the following technical scheme: an eight-axis driven multipoint hydraulic stretching pad hydraulic system comprises a main cylinder arranged at the center inside a hydraulic stretching pad, eight stretching pad hydraulic cylinders arranged inside the hydraulic stretching pad, a first stretching pad hydraulic cylinder loop, a second stretching pad hydraulic cylinder loop, a third stretching pad hydraulic cylinder loop, a fourth stretching pad hydraulic cylinder loop, a fifth stretching pad hydraulic cylinder loop, a sixth stretching pad hydraulic cylinder loop, a seventh stretching pad hydraulic cylinder loop, an eighth stretching pad hydraulic cylinder loop and a main cylinder loop,
the four stretching pad hydraulic cylinders are arranged on one side of the main cylinder along the length direction of the hydraulic stretching pad at the same interval, the circle centers of the four stretching pad hydraulic cylinders on one side of the main cylinder are positioned on the same straight line, the other four stretching pad hydraulic cylinders are arranged on the other side of the main cylinder along the length direction of the hydraulic stretching pad at the same interval, the circle centers of the four stretching pad hydraulic cylinders on the other side of the main cylinder are positioned on the same straight line, the interval between the adjacent stretching pad hydraulic cylinders on one side of the main cylinder is equal to the interval between the adjacent stretching pad hydraulic cylinders on the other side of the main cylinder, and the straight lines where the stretching pad hydraulic cylinders on one side of the main cylinder and the other side;
the first stretching pad hydraulic cylinder loop comprises an oil port A, a first servo valve, an oil port P, a second servo valve, a first hydraulic control one-way valve, a second hydraulic control one-way valve, a first servo valve oil port T, a first electromagnetic ball valve and a first electromagnetic ball valve, wherein the oil port A is connected to a cartridge valve of a first cover plate with a damping hole on a main pressure oil pipe;
the first tensile pad hydraulic cylinder loop is identical to the second tensile pad hydraulic cylinder loop, the third tensile pad hydraulic cylinder loop, the fourth tensile pad hydraulic cylinder loop, the fifth tensile pad hydraulic cylinder loop, the sixth tensile pad hydraulic cylinder loop, the seventh tensile pad hydraulic cylinder loop and the eighth tensile pad hydraulic cylinder loop in principle;
the main cylinder loop comprises a cartridge valve with an oil port A connected to a seventeenth cover plate with a damping hole on a main pressure oil pipe, a large-diameter servo cartridge valve with an oil port A connected to an oil port B of the cartridge valve with the damping hole on the seventeenth cover plate, and a cartridge valve with an eighteenth cover plate with the damping hole, wherein the oil port B of the large-diameter servo cartridge valve is communicated with a working cavity of the main cylinder;
eight are equipped with the flexible displacement sensor of first built-in hysteresis lag, the flexible displacement sensor of the built-in hysteresis lag of second, the flexible displacement sensor of the built-in hysteresis lag of third, the flexible displacement sensor of the built-in hysteresis lag of fourth, the flexible displacement sensor of the built-in hysteresis lag of fifth, the flexible displacement sensor of the built-in hysteresis lag of sixth, the flexible displacement sensor of the built-in hysteresis lag of seventh, the flexible displacement sensor of the built-in hysteresis lag of eighth in the tensile pad pneumatic cylinder respectively.
As a further improvement of the technical scheme of the invention, the first stretching pad hydraulic cylinder loop further comprises a first proportional cartridge overflow valve, an oil port A of the first proportional cartridge overflow valve is connected in parallel to an oil path between an oil port B of a cartridge valve with a second cover plate provided with a damping hole and a rodless cavity of the first stretching pad hydraulic cylinder, the oil port B of the first proportional cartridge overflow valve is connected to a main oil return pipe, and a first pressure sensor is arranged on the oil path between the oil port B of the cartridge valve with the second cover plate provided with the damping hole and the rodless cavity of the first stretching pad hydraulic cylinder.
As a further improvement of the technical scheme of the invention, the first stretching pad hydraulic cylinder loop further comprises a first energy accumulator safety valve group, an oil port a of the first energy accumulator safety valve group is connected in parallel to an oil path between a rod cavity of the first stretching pad hydraulic cylinder and an oil port B of the first hydraulic control check valve, an oil port T of the first energy accumulator safety valve group is connected to the main oil return pipe, and a first energy accumulator is arranged on the first energy accumulator safety valve group.
As a further improvement of the technical scheme of the invention, a first high-pressure filter is connected in series on an oil path between the port P of the first electromagnetic ball valve and the control oil pipe.
As a further improvement of the technical scheme of the invention, the first servo valve oil port X is connected to an oil outlet of the first high-pressure filter.
As a further improvement of the technical scheme of the invention, the cartridge valve with the first cover plate provided with the damping hole, the first servo valve, the cartridge valve with the second cover plate provided with the damping hole and the first proportional cartridge overflow valve oil port Y are connected to an oil drainage pipe.
As a further improvement of the technical scheme of the invention, the signal output ends of all the built-in hysteresis telescopic displacement sensors are connected to the signal input end of the decoupling controller, and the signal output ends of the decoupling controller are respectively connected to the signal input ends of all the servo valves.
Compared with the prior art, the invention has the following beneficial effects:
1. the pressure of the rodless cavity of each stretching pad hydraulic cylinder is adjusted in real time according to different stretching working conditions, so that the working pressure of each stretching pad hydraulic cylinder is supplied as required, the multipoint pressure is adjustable, the vibration is small, the control precision is high, and the material flow requirement is met.
2. The position control precision of each stretching pad hydraulic cylinder is ensured through the decoupling controller and eight-axis cooperative decoupling control of eight position closed loops.
3. The use of the proportional cartridge overflow valve realizes the stable release of the high pressure of the rodless cavity of each stretching pad hydraulic cylinder, and the use of the large-drift-diameter servo cartridge valve ensures the impact-free release of the high pressure of the main cylinder working cavity.
4. The use of the energy accumulator improves the working efficiency, and the use of the high-pressure filter reduces the failure rate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural composition diagram of a prior art hydraulic stretching pad.
FIG. 2 is a schematic view of the installation location of the tension pad cylinder and the master cylinder of the present invention.
Fig. 3 is a schematic diagram of an eight-axis driven multi-point hydraulic tensioning pad hydraulic system of the present invention.
FIG. 4 is a schematic diagram of the hydraulic system of the first, second, third, and fourth extension cylinders and the master cylinder.
Fig. 5 is a schematic diagram of the hydraulic system of the fifth, sixth, seventh, and eighth tensioning cylinders.
FIG. 6 is a control schematic of the decoupling controller.
In the figure: y1, Y2, Y3, Y4, Y5, Y6, Y7, Y9, Y10, Y11, Y12, Y13, Y14, Y15, Y16, Y17, Y18, Y19, Y20, Y21, Y22, Y23, Y24, Y25, Y26-electromagnet, 1-slider, 2-upper die, 3-bracket, 4-lower die, 5-hydraulic stretching pad, 6-stretching pad hydraulic cylinder, 7-plate, 1.1-cartridge valve with damping hole on first cover plate, 1.2-cartridge valve with damping hole on second cover plate, 1.3-cartridge valve with damping hole on third cover plate, 1.4-cartridge valve with damping hole on fourth cover, 1.5-cartridge valve with damping hole on fifth cover plate, 1.6-cartridge valve with damping hole on sixth cover plate, 1.7-cartridge valve with damping hole on seventh cover plate, 1.8-cartridge valve with damping hole on eighth cover plate, 1.9-ninth damping hole, 1.10-a tenth cover plate damping hole cartridge valve, 1.11-an eleventh cover plate damping hole cartridge valve, 1.12-a twelfth cover plate damping hole cartridge valve, 1.13-a thirteenth cover plate damping hole cartridge valve, 1.14-a fourteenth cover plate damping hole cartridge valve, 1.15-a fifteenth cover plate damping hole cartridge valve, 1.16-a sixteenth cover plate damping hole cartridge valve, 2.1-a first servo valve, 2.2-a second servo valve, 2.3-a third servo valve, 2.4-a fourth servo valve, 2.5-a fifth servo valve, 2.6-a sixth servo valve, 2.7-a seventh servo valve, 2.8-an eighth servo valve, 3.1-a first pressure sensor, 3.2-a second pressure sensor, 3.3-a third pressure sensor, 3.4-a fourth pressure sensor, 3.5-a fifth pressure sensor, 3.6-a sixth pressure sensor, 3.7-a seventh pressure sensor, 3.8-an eighth pressure sensor, 4.1-a first built-in hysteresis telescopic displacement sensor, 4.2-a second built-in hysteresis telescopic displacement sensor, 4.3-a third built-in hysteresis telescopic displacement sensor, 4.4-a fourth built-in hysteresis telescopic displacement sensor, 4.5-a fifth built-in hysteresis telescopic displacement sensor, 4.6-a sixth built-in hysteresis telescopic displacement sensor, 4.7-a seventh built-in hysteresis telescopic displacement sensor, 4.8-an eighth built-in hysteresis telescopic displacement sensor, 5.1-a first proportional cartridge overflow valve, 5.2-a second proportional cartridge overflow valve, 5.3-a third proportional cartridge overflow valve, 5.4-a fourth proportional overflow valve, 5.5-a fifth proportional overflow valve, 5.6-a sixth proportional cartridge overflow valve, 5.7-a seventh proportional relief valve, 5.8-an eighth proportional relief valve, 6.1-a first tensile pad hydraulic cylinder, 6.2-a second tensile pad hydraulic cylinder, 6.3-a third tensile pad hydraulic cylinder, 6.4-a fourth tensile pad hydraulic cylinder, 6.5-a fifth tensile pad hydraulic cylinder, 6.6-a sixth tensile pad hydraulic cylinder, 6.7-a seventh tensile pad hydraulic cylinder, 6.8-an eighth tensile pad hydraulic cylinder, 7.1-a first accumulator, 7.2-a second accumulator, 7.3-a third accumulator, 7.4-a fourth accumulator, 7.5-a fifth accumulator, 7.6-a sixth accumulator, 7.7-a seventh accumulator, 7.8-an eighth accumulator, 8.1-a first accumulator safety valve bank, 8.2-a second accumulator safety valve bank, 8.3-a third accumulator safety valve bank, 8.4-a fourth accumulator, 8.5-a fifth accumulator relief valve bank, 8.6-a sixth accumulator relief valve bank, 8.7-a seventh accumulator relief valve bank, 8.8-an eighth accumulator relief valve bank, 9.1-a first pilot operated check valve, 9.2-a second pilot operated check valve, 9.3-a third pilot operated check valve, 9.4-a fourth pilot operated check valve, 9.5-a fifth pilot operated check valve, 9.6-a sixth pilot operated check valve, 9.7-a seventh pilot operated check valve, 9.8-an eighth pilot operated check valve, 10.1-a first electromagnetic ball valve, 10.2-a second electromagnetic ball valve, 10.3-a third electromagnetic ball valve, 10.4-a fourth electromagnetic ball valve, 10.5-a fifth electromagnetic ball valve, 10.6-a sixth electromagnetic ball valve, 10.7-a seventh electromagnetic ball valve, 10.8-an eighth electromagnetic ball valve, 11.1-a first high pressure filter, 11.2-a second high pressure filter, 11.3-a third high-pressure filter, 11.4-a fourth high-pressure filter, 11.5-a fifth high-pressure filter, 11.6-a sixth high-pressure filter, 11.7-a seventh high-pressure filter, 11.8-an eighth high-pressure filter, 12.1-a seventeenth cover plate cartridge valve with a damping hole, 12.2-an eighteenth cover plate cartridge valve with a damping hole, 13-a large-diameter servo cartridge valve, 14-a main cylinder, a P-main pressure oil pipe, a T-main oil return pipe, an X-control oil pipe and a Y-oil drain pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
An eight-axis driven multipoint hydraulic stretching pad hydraulic system comprises a main cylinder 14 arranged at the center inside a hydraulic stretching pad 5, eight stretching pad hydraulic cylinders 6 arranged inside the hydraulic stretching pad 5, a first stretching pad hydraulic cylinder loop, a second stretching pad hydraulic cylinder loop, a third stretching pad hydraulic cylinder loop, a fourth stretching pad hydraulic cylinder loop, a fifth stretching pad hydraulic cylinder loop, a sixth stretching pad hydraulic cylinder loop, a seventh stretching pad hydraulic cylinder loop, an eighth stretching pad hydraulic cylinder loop and a main cylinder loop,
the four stretching pad hydraulic cylinders 6 are arranged on one side of the main cylinder 14 at the same interval along the length direction of the hydraulic stretching pad 5, the centers of the four stretching pad hydraulic cylinders 6 on one side of the main cylinder 14 are positioned on the same straight line, the other four stretching pad hydraulic cylinders 6 are arranged on the other side of the main cylinder 14 at the same interval along the length direction of the hydraulic stretching pad 5, the centers of the four stretching pad hydraulic cylinders 6 on the other side of the main cylinder 14 are positioned on the same straight line, the interval between the adjacent stretching pad hydraulic cylinders 6 on one side of the main cylinder 14 is equal to the interval between the adjacent stretching pad hydraulic cylinders 6 on the other side of the main cylinder 14, and the straight lines where the stretching pad hydraulic cylinders 6 on one side of the main cylinder 14 and the other side are positioned are.
The first stretching cushion hydraulic cylinder loop comprises a first cover plate with a damping hole cartridge valve 1.1, an oil port A is connected to the first cover plate with the damping hole cartridge valve 1.1, an oil port P is connected to a first servo valve 2.1, an oil port A is connected to a second cover plate with the damping hole cartridge valve 1.2, an oil port B is connected to a first hydraulic control one-way valve 9.1, a rod cavity of the first stretching cushion hydraulic cylinder 6.1, an oil port B of a cartridge valve 1.2 with a damping hole of the second cover plate is communicated with a rodless cavity of a first stretching cushion hydraulic cylinder 6.1, the oil port A of the first hydraulic control one-way valve 9.1 is connected with the oil port A of the first servo valve 2.1, the oil port T of the first servo valve 2.1 is connected to the main oil return pipe T, the first hydraulic control one-way valve 9.1 is provided with a first electromagnetic ball valve 10.1, and a port P of the first electromagnetic ball valve 10.1 is connected to the control oil pipe X through a first high-pressure filter 11.1.
The first tensile pad hydraulic cylinder loop is identical to the second tensile pad hydraulic cylinder loop, the third tensile pad hydraulic cylinder loop, the fourth tensile pad hydraulic cylinder loop, the fifth tensile pad hydraulic cylinder loop, the sixth tensile pad hydraulic cylinder loop, the seventh tensile pad hydraulic cylinder loop and the eighth tensile pad hydraulic cylinder loop in principle.
The method specifically comprises the following steps: the second stretching cushion hydraulic cylinder loop comprises an oil port A connected to a cartridge valve 1.3 of a third cover plate with a damping hole on a main pressure oil pipe P, the oil port P connected to a second servo valve 2.2 on an oil port B of the cartridge valve 1.3 of the third cover plate with the damping hole, the oil port A connected to a cartridge valve 1.4 of a fourth cover plate with the damping hole on an oil port B of the second servo valve 2.2, the oil port B connected to a second hydraulic control one-way valve 9.2 on a rod cavity of a second stretching cushion hydraulic cylinder 6.2, an oil port B of a cartridge valve 1.4 with a damping hole of the fourth cover plate is communicated with a rodless cavity of a second stretching cushion hydraulic cylinder 6.2, the oil port A of the second hydraulic control one-way valve 9.2 is connected with the oil port A of the second servo valve 2.2, the oil port T of the second servo valve 2.2 is connected to the main oil return pipe T, and a second electromagnetic ball valve 10.2 is arranged on the second hydraulic control one-way valve 9.2, and a port 10.2P of the second electromagnetic ball valve is connected to the control oil pipe X through a second high-pressure filter 11.2.
The third stretching pad hydraulic cylinder loop comprises an oil port A connected to a cartridge valve 1.5 of a fifth cover plate with a damping hole on a main pressure oil pipe P, the oil port P connected to a third servo valve 2.3 on an oil port B of the cartridge valve 1.5 of the fifth cover plate with the damping hole, the oil port A connected to a cartridge valve 1.6 of a sixth cover plate with the damping hole on an oil port B of the third servo valve 2.3, the oil port B connected to a third hydraulic control one-way valve 9.3 on a rod cavity of the first stretching pad hydraulic cylinder 6.1, an oil port B of a cartridge valve 1.6 with a damping hole of the sixth cover plate is communicated with a rodless cavity of a third stretching pad hydraulic cylinder 6.3, the oil port A of the third hydraulic control one-way valve 9.3 is connected with the oil port A of the third servo valve 2.3, the oil port T of the third servo valve 2.3 is connected to the main oil return pipe T, and a third electromagnetic ball valve 10.3 is arranged on the third hydraulic control one-way valve 9.3, and a port P of the third electromagnetic ball valve 10.3 is connected to the control oil pipe X through a third high-pressure filter 11.3.
The fourth stretching pad hydraulic cylinder loop comprises an oil port A connected to a cartridge valve 1.7 of a seventh cover plate with a damping hole on a main pressure oil pipe P, an oil port P connected to a fourth servo valve 2.4 on an oil port B of the cartridge valve 1.7 of the seventh cover plate with the damping hole, the oil port A connected to a cartridge valve 1.8 of an eighth cover plate with the damping hole on an oil port B of the fourth servo valve 2.4, the oil port B connected to a fourth hydraulic control one-way valve 9.4 on a rod cavity of a fourth stretching pad hydraulic cylinder 6.4, an oil port B of a cartridge valve 1.8 with an eighth cover plate provided with a damping hole is communicated with a rodless cavity of a fourth stretching pad hydraulic cylinder 6.4, the oil port A of the fourth hydraulic control one-way valve 9.4 is connected with the oil port A of the fourth servo valve 2.4, the oil port T of the fourth servo valve 2.4 is connected to the main oil return pipe T, and a fourth electromagnetic ball valve 10.4 is arranged on the fourth hydraulic control one-way valve 9.4, and a port 10.4P of the fourth electromagnetic ball valve is connected to the control oil pipe X through a fourth high-pressure filter 11.4.
The fifth stretching pad hydraulic cylinder loop comprises a cartridge valve 1.9 with an oil port A connected to a ninth cover plate damping hole on a main pressure oil pipe P, a fifth servo valve 2.5 with an oil port P connected to a cartridge valve 1.9 with a damping hole on the ninth cover plate damping hole on a cartridge valve 1.9, an oil port A connected to a cartridge valve 1.10 with a damping hole on a tenth cover plate on an oil port B of the fifth servo valve 2.5, an oil port B connected to a fifth hydraulic control one-way valve 9.5 on a rod cavity of a fifth stretching pad hydraulic cylinder 6.5, an oil port B of a cartridge valve 1.10 with a damping hole on the tenth cover plate is communicated with a rodless cavity of a fifth stretching pad hydraulic cylinder 6.5, the oil port A of the fifth hydraulic control one-way valve 9.5 is connected with the oil port A of the fifth servo valve 2.5, the oil port T of the fifth servo valve 2.5 is connected to the main oil return pipe T, and a fifth electromagnetic ball valve 10.5 is arranged on the fifth hydraulic control one-way valve 9.5, and a port 10.5P of the fifth electromagnetic ball valve is connected to the control oil pipe X through a fifth high-pressure filter 11.5.
The sixth stretching pad hydraulic cylinder loop comprises a cartridge valve 1.11 with an oil port A connected to an eleventh cover plate damping hole on a main pressure oil pipe P, a sixth servo valve 2.6 with an oil port P connected to the cartridge valve 1.11 with the eleventh cover plate damping hole on an oil port B, an oil port A connected to a cartridge valve 1.12 with a twelfth cover plate damping hole on an oil port B of the sixth servo valve 2.6, an oil port B connected to a sixth hydraulic control one-way valve 9.6 on a rod cavity of the sixth stretching pad hydraulic cylinder 6.6, an oil port B of a cartridge valve 1.12 with a damping hole on the twelfth cover plate is communicated with a rodless cavity of a sixth stretching pad hydraulic cylinder 6.6, the oil port A of the sixth hydraulic control one-way valve 9.6 is connected with the oil port A of the sixth servo valve 2.6, the oil port T of the sixth servo valve 2.6 is connected to the main oil return pipe T, and a sixth electromagnetic ball valve 10.6 is arranged on the sixth hydraulic control one-way valve 9.6, and a port P of the sixth electromagnetic ball valve 10.6 is connected to the control oil pipe X through a sixth high-pressure filter 11.6.
The seventh stretching cushion hydraulic cylinder loop comprises a cartridge valve 1.13 with an oil port A connected to a thirteenth cover plate damping hole on a main pressure oil pipe P, a seventh servo valve 2.7 with an oil port P connected to a cartridge valve 1.13 with a damping hole on the thirteenth cover plate damping hole on a cartridge valve 1.13, an oil port A connected to a cartridge valve 1.14 with a damping hole on a fourteenth cover plate on an oil port B of the seventh servo valve 2.7, an oil port B connected to a seventh hydraulic control one-way valve 9.7 on a rod cavity of a seventh stretching cushion hydraulic cylinder 6.7, an oil port B of a cartridge valve 1.14 with a damping hole on the fourteenth cover plate is communicated with a rodless cavity of a seventh stretching pad hydraulic cylinder 6.7, the oil port A of the seventh hydraulic control one-way valve 9.7 is connected with the oil port A of the seventh servo valve 2.7, the oil port T of the seventh servo valve 2.7 is connected to the main oil return pipe T, and a seventh electromagnetic ball valve 10.7 is arranged on the seventh hydraulic control one-way valve 9.7, and a port P of the seventh electromagnetic ball valve 10.7 is connected to the control oil pipe X through a seventh high-pressure filter 11.7.
The eighth stretching pad hydraulic cylinder loop comprises an oil port A connected to a cartridge valve 1.15 of a fifteenth cover plate with a damping hole on a main pressure oil pipe P, an eighth servo valve 2.8 connected to an oil port B of the cartridge valve 1.15 of the fifteenth cover plate with the damping hole, an oil port A connected to a cartridge valve 1.16 of a sixteenth cover plate with the damping hole on an oil port B of the eighth servo valve 2.8, an oil port B connected to an eighth hydraulic control one-way valve 9.8 on a rod cavity of an eighth stretching pad hydraulic cylinder 6.8, an oil port B of a cartridge valve 1.16 with a damping hole of the sixteenth cover plate is communicated with a rodless cavity of an eighth stretching pad hydraulic cylinder 6.8, the oil port A of the eighth hydraulic control one-way valve 9.8 is connected with the oil port A of the eighth servo valve 2.8, the oil port T of the eighth servo valve 2.8 is connected to the main oil return pipe T, an eighth electromagnetic ball valve 10.8 is arranged on the eighth hydraulic control one-way valve 9.8, and a port 10.8P of the eighth electromagnetic ball valve is connected to the control oil pipe X through an eighth high-pressure filter 11.8.
The main cylinder loop comprises a cartridge valve 12.1 with an oil port A connected to a seventeenth cover plate with a damping hole on a main pressure oil pipe P, a large-diameter servo cartridge valve 13 connected to a cartridge valve 12.1 with the damping hole on the seventeenth cover plate with the damping hole on an oil port B, a cartridge valve 12.2 with an eighteenth cover plate with the damping hole on an oil port B, the oil port B of the large-diameter servo cartridge valve 13 is communicated with a working cavity of a main cylinder 14, the cartridge valve 12.2 with the damping hole on the eighteenth cover plate with the damping hole on an oil path between the cartridge valve 12.1 with the damping hole on the seventeenth cover plate and the large-diameter servo cartridge valve 13, and the cartridge valve 12.2 with the damping hole on the eighteenth cover plate with the damping hole on an oil port A connected to a main oil return pipe T.
Eight stretch and fill up and be equipped with first built-in hysteresis lag telescopic displacement sensor 4.1, the built-in hysteresis lag telescopic displacement sensor 4.2 of second, the built-in hysteresis lag telescopic displacement sensor 4.3 of third, the built-in hysteresis lag telescopic displacement sensor 4.4 of fourth, the built-in hysteresis lag telescopic displacement sensor 4.5 of fifth, the built-in hysteresis lag telescopic displacement sensor 4.6 of sixth, the built-in hysteresis lag telescopic displacement sensor 4.7 of seventh, the built-in hysteresis lag telescopic displacement sensor 4.8 of eighth in the pneumatic cylinder 6 respectively.
In the process of stretching the plate 7, the precise control of the position of the stretching pad hydraulic cylinder mainly comprises a position closed loop formed by the first stretching pad hydraulic cylinder 6.1 and the first servo valve 2.1 through the first built-in hysteresis telescopic displacement sensor 4.1, a position closed loop formed by the second stretching pad hydraulic cylinder 6.2 and the second servo valve 2.2 through the second built-in hysteresis telescopic displacement sensor 4.2, a position closed loop formed by the third stretching pad hydraulic cylinder 6.3 and the third servo valve 2.3 through the third built-in hysteresis telescopic displacement sensor 4.3, a position closed loop formed by the fourth stretching pad hydraulic cylinder 6.4 and the fourth servo valve 2.4 through the fourth built-in hysteresis telescopic displacement sensor 4.4, a position closed loop formed by the fifth stretching pad hydraulic cylinder 6.5 and the fifth servo valve 2.5 through the fifth built-in hysteresis telescopic displacement sensor 4.5, a position closed loop formed by the sixth stretching pad hydraulic cylinder 6.6 and the sixth servo valve 2.6 through the sixth built-in hysteresis telescopic displacement sensor 4.6, The seventh stretching pad hydraulic cylinder 6.7 and the seventh servo valve 2.7 form a position closed loop through a seventh built-in hysteresis stretching displacement sensor 4.7, and the eighth stretching pad hydraulic cylinder 6.8 and the eighth servo valve 2.8 form a position closed loop through an eighth built-in hysteresis stretching displacement sensor 4.8 to realize eight-axis drive cooperative control. The magnitude of the velocity of each tension pad cylinder 6 is proportional to the magnitude of the energizing voltage of each corresponding servo valve. Specifically, the large-bore servo cartridge valve 13 is a well-known device in the art, and a DSHR type servo cartridge valve manufactured by MOOG muck may be used. The speed of the master cylinder 14 is mainly controlled by adjusting the opening degree of the valve core of the large-diameter servo cartridge valve 13, and the opening degree of the valve core of the large-diameter servo cartridge valve 13 is in direct proportion to the magnitude of the voltage. The larger the voltage of the large-drift-diameter servo cartridge valve 13 is, the larger the opening degree of a valve core of the large-drift-diameter servo cartridge valve 13 is, the more hydraulic oil flows into a working cavity of the main cylinder 14, and the faster the main cylinder 14 moves; conversely, the smaller the voltage applied to the large-diameter servo cartridge valve 13 is, the smaller the opening degree of the spool of the large-diameter servo cartridge valve 13 is, the less hydraulic oil flows into the working chamber of the master cylinder 14, and the slower the master cylinder 14 moves. The large-diameter servo cartridge valve 13 ensures the high-pressure impact-free release of the working oil chamber of the main cylinder 14.
Specifically, the signal output ends of all the built-in hysteresis telescopic displacement sensors are connected to the signal input end of the decoupling controller, and the signal output ends of the decoupling controller are respectively connected to the signal input end of each servo valve. In the eight-axis drive cooperative control process, position signals of eight channels acquired by built-in hysteresis telescopic displacement sensors of the eight stretching pad hydraulic cylinders 6 are respectively fed back to the input end of the decoupling controller in real time, and are respectively input to the signal input ends corresponding to the eight servo valves through eight output channels of the decoupling controller after operational decoupling of the decoupling controller. The decoupling controller avoids the defect of movement disorder caused by mutual interference between the signals in multiple channels during transmission, and also avoids the time lag between eight channels.
The first stretching pad hydraulic cylinder loop further comprises a first proportional plug-in overflow valve 5.1, an oil port A of the first proportional plug-in overflow valve 5.1 is connected in parallel to an oil path between a plug-in valve 1.2 with a damping hole of a second cover plate and a rodless cavity of the first stretching pad hydraulic cylinder 6.1, an oil port B of the first proportional plug-in overflow valve 5.1 is connected to a main oil return pipe T, and a first pressure sensor 3.1 is arranged on the oil path between the plug-in valve 1.2 with the damping hole of the second cover plate and the rodless cavity of the first stretching pad hydraulic cylinder 6.1. The first tensile pad hydraulic cylinder loop is identical to the second tensile pad hydraulic cylinder loop, the third tensile pad hydraulic cylinder loop, the fourth tensile pad hydraulic cylinder loop, the fifth tensile pad hydraulic cylinder loop, the sixth tensile pad hydraulic cylinder loop, the seventh tensile pad hydraulic cylinder loop and the eighth tensile pad hydraulic cylinder loop in principle. Namely, the second stretching pad hydraulic cylinder loop further comprises a second proportional cartridge overflow valve 5.2, an oil port A of the second proportional cartridge overflow valve 5.2 is connected in parallel to an oil path between a cartridge valve 1.4 oil port B of a fourth cover plate with a damping hole and a rodless cavity of the second stretching pad hydraulic cylinder 6.2, an oil port B of the second proportional cartridge overflow valve 5.2 is connected to a main oil return pipe T, and a second pressure sensor 3.2 is arranged on the oil path between the cartridge valve 1.4 oil port B of the fourth cover plate with the damping hole and the rodless cavity of the second stretching pad hydraulic cylinder 6.2; the third stretching pad hydraulic cylinder loop further comprises a third proportion plug-in overflow valve 5.3, an oil port A of the third proportion plug-in overflow valve 5.3 is connected in parallel to an oil path between a plug-in valve 1.6 oil port B of the sixth cover plate with a damping hole and a rodless cavity of the third stretching pad hydraulic cylinder 6.3, an oil port B of the third proportion plug-in overflow valve 5.3 is connected to a main oil return pipe T, and a third pressure sensor 3.3 is arranged on the oil path between the plug-in valve 1.6 oil port B of the sixth cover plate with the damping hole and the rodless cavity of the third stretching pad hydraulic cylinder 6.3; the fourth stretching pad hydraulic cylinder loop further comprises a fourth proportion plug-in overflow valve 5.4, an oil port A of the fourth proportion plug-in overflow valve 5.4 is connected in parallel to an oil path between a plug-in valve 1.8 with a damping hole of an eighth cover plate and a rodless cavity of the fourth stretching pad hydraulic cylinder 6.4, an oil port B of the fourth proportion plug-in overflow valve 5.4 is connected to a main oil return pipe T, and a fourth pressure sensor 3.4 is arranged on the oil path between the plug-in valve 1.8 with the damping hole of the eighth cover plate and the rodless cavity of the fourth stretching pad hydraulic cylinder 6.4; the fifth stretching pad hydraulic cylinder loop further comprises a fifth proportion plug-in overflow valve 5.5, an oil port A of the fifth proportion plug-in overflow valve 5.5 is connected in parallel to an oil path between a plug-in valve 1.10 with a damping hole of a tenth cover plate and a rodless cavity of the fifth stretching pad hydraulic cylinder 6.5, an oil port B of the fifth proportion plug-in overflow valve 5.5 is connected to a main oil return pipe T, and a fifth pressure sensor 3.5 is arranged on the oil path between the plug-in valve 1.10 with the damping hole of the tenth cover plate and the rodless cavity of the fifth stretching pad hydraulic cylinder 6.5; the sixth stretching pad hydraulic cylinder loop further comprises a sixth proportion plug-in overflow valve 5.6, an oil port A of the sixth proportion plug-in overflow valve 5.6 is connected in parallel to an oil path between a plug-in valve 1.12 with a damping hole of a twelfth cover plate and a rodless cavity of the sixth stretching pad hydraulic cylinder 6.6, an oil port B of the sixth proportion plug-in overflow valve 5.6 is connected to a main oil return pipe T, and a sixth pressure sensor 3.6 is arranged on the oil path between the plug-in valve 1.12 with the damping hole of the twelfth cover plate and the rodless cavity of the sixth stretching pad hydraulic cylinder 6.6; the seventh stretching pad hydraulic cylinder loop further comprises a seventh proportional plug-in overflow valve 5.7, an oil port A of the seventh proportional plug-in overflow valve 5.7 is connected in parallel to an oil path between a plug-in valve 1.14 with a damping hole of a fourteenth cover plate and a rodless cavity of the seventh stretching pad hydraulic cylinder 6.7, an oil port B of the seventh proportional plug-in overflow valve 5.7 is connected to a main oil return pipe T, and a seventh pressure sensor 3.7 is arranged on the oil path between the plug-in valve 1.14 with the damping hole of the fourteenth cover plate and the rodless cavity of the seventh stretching pad hydraulic cylinder 6.7; the eighth stretching pad hydraulic cylinder loop further comprises an eighth proportional cartridge overflow valve 5.8, an oil port A of the eighth proportional cartridge overflow valve 5.8 is connected in parallel to an oil path between a cartridge valve 1.16 oil port B of the sixteenth cover plate with a damping hole and a rodless cavity of the eighth stretching pad hydraulic cylinder 6.8, an oil port B of the eighth proportional cartridge overflow valve 5.8 is connected to a main oil return pipe T, and an eighth pressure sensor 3.8 is arranged on an oil path between the cartridge valve 1.16 oil port B of the sixteenth cover plate with the damping hole and the rodless cavity of the eighth stretching pad hydraulic cylinder 6.8.
When the device is used specifically, the first stretching pad hydraulic cylinder 6.1 and the first proportional cartridge overflow valve 5.1 form a pressure closed loop through the first pressure sensor 3.1, the second stretching pad hydraulic cylinder 6.2 and the second proportional cartridge overflow valve 5.2 form a pressure closed loop through the second pressure sensor 3.2, the third stretching pad hydraulic cylinder 6.3 and the third proportional cartridge overflow valve 5.3 form a pressure closed loop through the third pressure sensor 3.3, the fourth stretching pad hydraulic cylinder 6.4 and the fourth proportional cartridge overflow valve 5.4 form a pressure closed loop through the fourth pressure sensor 3.4, the fifth stretching pad hydraulic cylinder 6.5 and the fifth proportional cartridge overflow valve 5.5 form a pressure closed loop through the fifth pressure sensor 3.5, the sixth stretching pad hydraulic cylinder 6.6 and the sixth proportional cartridge overflow valve 5.6 form a pressure closed loop through the sixth cartridge pressure sensor 3.6, the seventh stretching pad hydraulic cylinder 6.7 and the seventh proportional cartridge overflow valve 5.7 form a pressure closed loop through the seventh pressure sensor 3.7, And the eighth stretching pad hydraulic cylinder 6.8 and the eighth proportional plug-in overflow valve 5.8 form a pressure closed loop through an eighth pressure sensor 3.8. The key to the multi-point hydraulic tension pad hydraulic system is eight tension pad hydraulic cylinders 6 mounted below the hydraulic tension pad 5. The pressure of the rodless cavity of each stretching pad hydraulic cylinder 6 can be adjusted in real time by each pressure closed loop according to different stretching working conditions, so that the supply and stepless change of the working pressure of each stretching pad hydraulic cylinder 6 according to the requirement are realized. Different working pressures can change the tensile force of the sheet material 7 between the upper die 2 and the bracket 3 in real time. If the working pressure of one of the tension pad cylinders 6 is increased, the tension at that point is increased, the material flowing between the dies becomes less, and the thickness of the formed product becomes thinner. On the other hand, if the working pressure of the tension pad cylinder 6 is lowered, the tension at that point is reduced, the amount of material flowing between the dies becomes large, and the thickness of the molded product becomes thick. Meanwhile, the proportional plug-in overflow valve can ensure the impact-free release of the high pressure of the rodless cavity of the stretching pad hydraulic cylinder 6.
Further, the first stretching pad hydraulic cylinder loop further comprises a first energy accumulator safety valve group 8.1, an oil port A of the first energy accumulator safety valve group 8.1 is connected in parallel to an oil path between a rod cavity of the first stretching pad hydraulic cylinder 6.1 and an oil port B of the first hydraulic control one-way valve 9.1, an oil port T of the first energy accumulator safety valve group 8.1 is connected to a main oil return pipe T, and a first energy accumulator 7.1 is arranged on the first energy accumulator safety valve group 8.1 in a matched mode. Similarly, the second stretching pad hydraulic cylinder circuit also comprises a second energy accumulator safety valve group 8.2 and a second energy accumulator 7.2, the third stretching pad hydraulic cylinder circuit comprises a third energy accumulator safety valve group 8.3 and a third energy accumulator 7.3, the fourth stretching pad hydraulic cylinder circuit comprises a fourth energy accumulator safety valve group 8.4 and a fourth energy accumulator 7.4, the fifth stretching pad hydraulic cylinder circuit comprises a fifth energy accumulator safety valve group 8.5 and a fifth energy accumulator 7.5, the sixth stretching pad hydraulic cylinder circuit comprises a sixth energy accumulator safety valve group 8.6 and a sixth energy accumulator 7.6, the seventh stretching pad hydraulic cylinder circuit comprises a seventh energy accumulator safety valve group 8.7 and a seventh energy accumulator 7.7, and the eighth stretching pad hydraulic cylinder circuit comprises an eighth energy accumulator safety valve group 8.8 and an eighth energy accumulator 7.8. When the stretching process is finished and the hydraulic stretching pad 5 needs to return quickly, the eight energy accumulators are used as eight auxiliary power sources to respectively and quickly charge liquid into rod cavities of the eight stretching pad hydraulic cylinders 6 corresponding to the eight energy accumulators, so that the hydraulic stretching pad 5 can return quickly, the return time is shortened, and the working efficiency is improved.
In order to avoid the situation that the valve core is clamped by impurities in oil, a first high-pressure filter 11.1 is connected in series on an oil path between a port 10.1P of the first electromagnetic ball valve and the control oil pipe X. The oil entering the control oil way of each valve body is filtered through the high-pressure filter, so that the valve core is prevented from being clamped due to the existence of oil impurities in the stretching process, and the failure rate is reduced. The first tensile pad hydraulic cylinder loop is identical to the second tensile pad hydraulic cylinder loop, the third tensile pad hydraulic cylinder loop, the fourth tensile pad hydraulic cylinder loop, the fifth tensile pad hydraulic cylinder loop, the sixth tensile pad hydraulic cylinder loop, the seventh tensile pad hydraulic cylinder loop and the eighth tensile pad hydraulic cylinder loop in principle.
Preferably, the first servo valve 2.1 port X is connected to the oil outlet of the first high-pressure filter 11.1. The first tensile pad hydraulic cylinder loop is identical to the second tensile pad hydraulic cylinder loop, the third tensile pad hydraulic cylinder loop, the fourth tensile pad hydraulic cylinder loop, the fifth tensile pad hydraulic cylinder loop, the sixth tensile pad hydraulic cylinder loop, the seventh tensile pad hydraulic cylinder loop and the eighth tensile pad hydraulic cylinder loop in principle.
In specific implementation, an oil port Y of the cartridge valve 1.1 with the first cover plate provided with the damping hole, a first servo valve 2.1, a cartridge valve 1.2 with the second cover plate provided with the damping hole and a first proportional cartridge overflow valve 5.1 are connected to an oil drainage pipe Y. The first tensile pad hydraulic cylinder loop is identical to the second tensile pad hydraulic cylinder loop, the third tensile pad hydraulic cylinder loop, the fourth tensile pad hydraulic cylinder loop, the fifth tensile pad hydraulic cylinder loop, the sixth tensile pad hydraulic cylinder loop, the seventh tensile pad hydraulic cylinder loop and the eighth tensile pad hydraulic cylinder loop in principle.
When the high-pressure oil pipe hydraulic system is used, the electromagnet Y1, the electromagnet Y2 and the electromagnet Y3 are electrified simultaneously, the drive reversing device of the first servo valve 2.1 works at the YB1 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the first stretching cushion hydraulic cylinder 6.1 through an A-B channel of the cartridge valve 1.1 with the damping hole of the first cover plate, a P-B channel of the first servo valve 2.1 and an A-B channel of the cartridge valve 1.2 with the damping hole of the second cover plate, meanwhile, part of the oil of a rod cavity of the first stretching cushion hydraulic cylinder 6.1 flows into the first energy accumulator 7.1, and redundant oil flows into the main oil return pipe T through a B-A channel of the first hydraulic control one-way valve 9.1 and an A-T channel of the first servo valve 2.1.
Similarly, the electromagnet Y4, the electromagnet Y5 and the electromagnet Y6 are simultaneously electrified, the drive reversing device of the second servo valve 2.2 works at the YB3 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the second stretching cushion hydraulic cylinder 6.2 through an A-B channel of the cartridge valve 1.3 with a damping hole of the third cover plate, a P-B channel of the second servo valve 2.2 and an A-B channel of the cartridge valve 1.4 with a damping hole of the fourth cover plate, meanwhile, part of the oil of a rod cavity of the second stretching cushion hydraulic cylinder 6.2 flows into the second accumulator 7.2, and redundant oil flows into the main oil return pipe T through a B-A channel of the second hydraulic control one-way valve 9.2 and an A-T channel of the second servo valve 2.2.
The electromagnet Y7, the electromagnet Y8 and the electromagnet Y9 are simultaneously electrified, a driving reversing device of the third servo valve 2.3 works at a YB5 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the third stretching pad hydraulic cylinder 6.3 through an A-B channel of a cartridge valve 1.5 with a fifth cover plate damping hole, a P-B channel of the third servo valve 2.3 and an A-B channel of a cartridge valve 1.6 with a sixth cover plate damping hole, meanwhile, one part of oil in a rod cavity of the third stretching pad hydraulic cylinder 6.3 flows into the third energy accumulator 7.3, and redundant oil flows into a main oil return pipe T through a B-A channel of a third hydraulic control one-way valve 9.3 and an A-T channel of the third servo valve 2.3.
The electromagnet Y10, the electromagnet Y11 and the electromagnet Y12 are simultaneously electrified, a driving reversing device of the fourth servo valve 2.4 works at a YB7 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the fourth stretching pad hydraulic cylinder 6.4 through an A-B channel of a seventh cover plate damping hole cartridge valve 1.7, a P-B channel of the fourth servo valve 2.4 and an A-B channel of an eighth cover plate damping hole cartridge valve 1.8, meanwhile, a part of oil of a rod cavity of the fourth stretching pad hydraulic cylinder 6.4 flows into the fourth energy accumulator 7.4, and redundant oil flows into a main oil return pipe T through a B-A channel of a fourth hydraulic control one-way valve 9.4 and an A-T channel of the fourth servo valve 2.4.
The electromagnet Y13, the electromagnet Y14 and the electromagnet Y15 are simultaneously electrified, a drive reversing device of the fifth servo valve 2.5 works at a YB9 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the fifth stretching pad hydraulic cylinder 6.5 through an A-B channel of a cartridge valve 1.9 with a ninth cover plate damping hole, a P-B channel of the fifth servo valve 2.5 and an A-B channel of a cartridge valve 1.10 with a tenth cover plate damping hole, meanwhile, one part of oil of a rod cavity of the fifth stretching pad hydraulic cylinder 6.5 flows into the fifth energy accumulator 7.5, and redundant oil flows into a main oil return pipe T through a B-A channel of the fifth hydraulic control one-way valve 9.5 and an A-T channel of the fifth servo valve 2.5.
The electromagnet Y16, the electromagnet Y17 and the electromagnet Y18 are simultaneously electrified, a driving reversing device of the sixth servo valve 2.6 works at a YB11 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the sixth stretching pad hydraulic cylinder 6.6 through an A-B channel of an eleventh cover plate damping hole cartridge valve 1.11, a P-B channel of the sixth servo valve 2.6 and an A-B channel of a twelfth cover plate damping hole cartridge valve 1.12, meanwhile, a part of oil of a rod cavity of the sixth stretching pad hydraulic cylinder 6.6 flows into the sixth energy accumulator 7.6, and redundant oil flows into a main oil return pipe T through a B-A channel of a sixth hydraulic control one-way valve 9.6 and an A-T channel of the sixth servo valve 2.6.
The electromagnet Y19, the electromagnet Y20 and the electromagnet Y21 are simultaneously electrified, a drive reversing device of the seventh servo valve 2.7 works at the YB13 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the seventh drawing pad hydraulic cylinder 6.7 through an A-B channel of a plug-in valve 1.13 with a thirteenth cover plate provided with a damping hole, a P-B channel of the seventh servo valve 2.7 and an A-B channel of a plug-in valve 1.14 with a fourteenth cover plate provided with a damping hole, meanwhile, a part of oil of a rod cavity of the seventh drawing pad hydraulic cylinder 6.7 flows into the seventh energy accumulator 7.7, and redundant oil flows into a main oil return pipe T through a B-A channel of the seventh hydraulic control one-way valve 9.7 and an A-T channel of the seventh servo valve 2.7.
The electromagnet Y22, the electromagnet Y23 and the electromagnet Y24 are simultaneously electrified, a driving reversing device of the eighth servo valve 2.8 works at the YB15 position, hydraulic oil of a high-pressure oil pipe P flows into a rodless cavity of the eighth stretching pad hydraulic cylinder 6.8 through an A-B channel of a plug-in valve 1.15 with a fifteenth cover plate provided with a damping hole, a P-B channel of the eighth servo valve 2.8 and an A-B channel of a plug-in valve 1.16 with a sixteenth cover plate provided with a damping hole, meanwhile, part of the oil of a rod cavity of the eighth stretching pad hydraulic cylinder 6.8 flows into the eighth energy accumulator 7.8, and redundant oil flows into a main oil return pipe T through a B-A channel of the eighth hydraulic control one-way valve 9.8 and an A-T channel of the eighth servo valve 2.8.
The electromagnet Y25 is electrified, and hydraulic oil of the high-pressure oil pipe P flows into the working cavity of the main cylinder 14 through the A-B channel of the cartridge valve 12.1 with the seventeenth cover plate provided with the damping hole and the A-B channel of the large-drift-diameter servo cartridge valve 13.
The first stretching pad hydraulic cylinder 6.1, the second stretching pad hydraulic cylinder 6.2, the third stretching pad hydraulic cylinder 6.3, the fourth stretching pad hydraulic cylinder 6.4, the fifth stretching pad hydraulic cylinder 6.5, the sixth stretching pad hydraulic cylinder 6.6, the seventh stretching pad hydraulic cylinder 6.7, the eighth stretching pad hydraulic cylinder 6.8 and the main cylinder 14 simultaneously drive the hydraulic stretching pad 5 to rapidly rise, when the hydraulic stretching pad rises to the position set value of the displacement sensor, the electromagnet Y25 is powered off, the main cylinder 14 stops rising, and the eight stretching pad hydraulic cylinders 6 start to work in a pressure closed loop mode. The slide block 1 drives the upper die 2 to descend, and the plate 7 is stretched.
In the stretching process, each pressure closed loop can respectively adjust the pressure of the rodless cavity of each stretching pad hydraulic cylinder 6 in real time according to different stretching working conditions, so that the working pressure of each stretching pad hydraulic cylinder 6 can be supplied as required. Different working pressures can change the tensile force of the sheet material 7 between the upper die 2 and the bracket 3 in real time. If the working pressure of one of the tensioning pad cylinders 6 increases, the tension at that point increases and less material flows between the dies. On the contrary, if the working pressure of the tension pad cylinder 6 is lowered, the tension at that point is reduced, and the material flowing between the dies becomes more. Meanwhile, the proportional plug-in overflow valve can ensure the impact-free release of the high pressure of the rodless cavity of the stretching pad hydraulic cylinder 6.
After the stretching is finished, the electromagnet Y1, the electromagnet Y2 and the electromagnet Y3 are electrified simultaneously, the drive reversing device of the first servo valve 2.1 works at the YB2 position, hydraulic oil of ｃA high-pressure oil pipe P flows into ｃA rod cavity of the first stretching pad hydraulic cylinder 6.1 through an A-B channel of ｃA cartridge valve 1.1 with ｃA damping hole of ｃA first cover plate, ｃA P-A channel of the first servo valve 2.1 and an A-B channel of ｃA first hydraulic control one-way valve 9.1, the high-pressure oil of the first accumulator 7.1 is also quickly filled into the rod cavity of the first stretching pad hydraulic cylinder 6.1, and meanwhile, the hydraulic oil in ｃA rod-free cavity of the first stretching pad hydraulic cylinder 6.1 flows into ｃA main oil return pipe T through ｃA B-A channel of ｃA cartridge valve 1.2 with ｃA damping hole of ｃA second cover plate and ｃA B-T channel of the first servo valve 2.1.
Similarly, the electromagnet Y4, the electromagnet Y5 and the electromagnet Y6 are energized simultaneously, the drive reversing device of the second servo valve 2.2 works at the YB4 position, hydraulic oil of the high-pressure oil pipe P flows into ｃA rod cavity of the second stretching pad hydraulic cylinder 6.2 through an A-B channel of ｃA cartridge valve 1.3 with ｃA damping hole on ｃA third cover plate, ｃA P-A channel of the second servo valve 2.2 and an A-B channel of ｃA second hydraulic control one-way valve 9.2, high-pressure oil of the second accumulator 7.2 is also quickly filled into the rod cavity of the second stretching pad hydraulic cylinder 6.2, and meanwhile, hydraulic oil in ｃA rod-free cavity of the second stretching pad hydraulic cylinder 6.2 flows into ｃA main oil return pipe T through ｃA B-A channel of ｃA cartridge valve 1.4 with ｃA damping hole on ｃA fourth cover plate and ｃA B-T channel of the second servo valve 2.2.
The electromagnet Y7, the electromagnet Y8 and the electromagnet Y9 are electrified simultaneously, ｃA driving reversing device of the third servo valve 2.3 works at ｃA YB6 position, hydraulic oil of ｃA high-pressure oil pipe P flows into ｃA rod cavity of the third stretching pad hydraulic cylinder 6.3 through an A-B channel of ｃA cartridge valve 1.5 with ｃA damping hole on ｃA fifth cover plate, ｃA P-A channel of the third servo valve 2.3 and an A-B channel of ｃA third hydraulic control one-way valve 9.3, the high-pressure oil of the third energy accumulator 7.3 is quickly filled into the rod cavity of the third stretching pad hydraulic cylinder 6.3, and meanwhile, the hydraulic oil in ｃA rodless cavity of the third stretching pad hydraulic cylinder 6.3 flows into ｃA main oil return pipe T through ｃA B-A channel of ｃA cartridge valve 1.6 with ｃA damping hole on ｃA sixth cover plate and ｃA B-T channel of the third servo valve 2.3.
The electromagnet Y10, the electromagnet Y11 and the electromagnet Y12 are electrified simultaneously, ｃA driving reversing device of the fourth servo valve 2.4 works at the YB8 position, hydraulic oil of ｃA high-pressure oil pipe P flows into ｃA rod cavity of the fourth stretching cushion hydraulic cylinder 6.4 through an A-B channel of ｃA seventh cover plate damping hole cartridge valve 1.7, ｃA P-A channel of the fourth servo valve 2.4 and an A-B channel of ｃA fourth hydraulic control one-way valve 9.4, the high-pressure oil of the fourth energy accumulator 7.4 is also quickly filled into the rod cavity of the fourth stretching cushion hydraulic cylinder 6.4, and meanwhile, the hydraulic oil in ｃA rod-free cavity of the fourth stretching cushion hydraulic cylinder 6.4 flows into ｃA main oil return pipe T through ｃA B-A channel of an eighth cover plate damping hole cartridge valve 1.8 and ｃA B-T channel of the fourth servo valve 2.4.
The electromagnet Y13, the electromagnet Y14 and the electromagnet Y15 are electrified simultaneously, ｃA drive reversing device of the fifth servo valve 2.5 works at the YB10 position, hydraulic oil of ｃA high-pressure oil pipe P flows into ｃA rod cavity of the fifth stretching cushion hydraulic cylinder 6.5 through an A-B channel of ｃA cartridge valve 1.9 with ｃA damping hole on ｃA ninth cover plate, ｃA P-A channel of the fifth servo valve 2.5 and an A-B channel of ｃA fifth hydraulic control one-way valve 9.5, high-pressure oil of ｃA fifth energy accumulator 7.5 is quickly filled into the rod cavity of the fifth stretching cushion hydraulic cylinder 6.5, and meanwhile, the hydraulic oil in ｃA rodless cavity of the fifth stretching cushion hydraulic cylinder 6.5 flows into ｃA main oil return pipe T through ｃA B-A channel of ｃA cartridge valve 1.10 with ｃA damping hole on ｃA tenth cover plate and ｃA B-T channel of the fifth servo valve 2.5.
The electromagnet Y16, the electromagnet Y17 and the electromagnet Y18 are electrified simultaneously, ｃA driving reversing device of the sixth servo valve 2.6 works at the YB12 position, hydraulic oil of ｃA high-pressure oil pipe P flows into ｃA rod cavity of the sixth stretching pad hydraulic cylinder 6.6 through an A-B channel of an eleventh cover plate damping hole cartridge valve 1.11, ｃA P-A channel of the sixth servo valve 2.6 and an A-B channel of ｃA sixth hydraulic control one-way valve 9.6, high-pressure oil of ｃA sixth energy accumulator 7.6 is quickly filled into the rod cavity of the sixth stretching pad hydraulic cylinder 6.6, and meanwhile, the hydraulic oil in ｃA rod-free cavity of the sixth stretching pad hydraulic cylinder 6.6 flows into ｃA main oil return pipe T through ｃA B-A channel of ｃA twelfth cover plate damping hole cartridge valve 1.12 and ｃA B-T channel of the sixth servo valve 2.6.
The electromagnet Y19, the electromagnet Y20 and the electromagnet Y21 are electrified simultaneously, ｃA drive reversing device of the seventh servo valve 2.7 works at the YB14 position, hydraulic oil of ｃA high-pressure oil pipe P flows into ｃA rod cavity of the seventh drawing pad hydraulic cylinder 6.7 through an A-B channel of ｃA plug-in valve 1.13 with ｃA thirteenth cover plate provided with ｃA damping hole, ｃA P-A channel of the seventh servo valve 2.7 and an A-B channel of ｃA seventh hydraulic control one-way valve 9.7, high-pressure oil of the seventh energy accumulator 7.7 is quickly filled into the rod cavity of the seventh drawing pad hydraulic cylinder 6.7, and meanwhile, the hydraulic oil in ｃA rod-free cavity of the seventh drawing pad hydraulic cylinder 6.7 flows into ｃA main oil return pipe T through ｃA B-A channel of ｃA plug-in valve 1.14 with ｃA fourteenth cover plate provided with ｃA damping hole and ｃA B-T channel of the seventh servo valve 2.7.
The electromagnet Y22, the electromagnet Y23 and the electromagnet Y24 are electrified simultaneously, ｃA driving reversing device of the eighth servo valve 2.8 works at the YB16 position, hydraulic oil of ｃA high-pressure oil pipe P flows into ｃA rod cavity of the eighth drawing pad hydraulic cylinder 6.8 through an A-B channel of ｃA plug-in valve 1.15 with ｃA fifteenth cover plate provided with ｃA damping hole, ｃA P-A channel of the eighth servo valve 2.8 and an A-B channel of an eighth hydraulic control one-way valve 9.8, high-pressure oil of the eighth accumulator 7.8 is quickly filled into the rod cavity of the eighth drawing pad hydraulic cylinder 6.8, and meanwhile, the hydraulic oil in ｃA rod-free cavity of the eighth drawing pad hydraulic cylinder 6.8 flows into ｃA main oil return pipe T through ｃA B-A channel of ｃA plug-in valve 1.16 with ｃA sixteenth cover plate provided with ｃA damping hole and ｃA B-T channel of the eighth servo valve 2.8.
When eight shafts of the eight stretching pad hydraulic cylinders 6 return, the electromagnet Y25 is electrified, hydraulic oil of the high-pressure oil pipe P flows into a working cavity of the main cylinder 14 through an A-B channel of the plug-in valve 12.1 with a seventeenth cover plate provided with a damping hole and an A-B channel of the large-diameter servo plug-in valve 13, a piston rod of the main cylinder 14 extends out, and a stretching molded product is ejected. Then, the electromagnet Y25 is powered off, the electromagnet Y26 is powered on, and high-pressure oil in the working chamber of the main cylinder 14 flows into the main oil return pipe T through a B-A channel of the large-diameter servo cartridge valve 13 and a B-A channel of the cartridge valve 12.2 with the damping hole on the eighteenth cover plate. The use of the large-drift-diameter servo cartridge valve 13 ensures the high-pressure impact-free release of the main cylinder working chamber 14.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. An eight-axis driven multipoint hydraulic stretching pad hydraulic system comprises a main cylinder (14) arranged at the center inside a hydraulic stretching pad (5), and is characterized by further comprising eight stretching pad hydraulic cylinders (6) arranged inside the hydraulic stretching pad (5), a first stretching pad hydraulic cylinder loop, a second stretching pad hydraulic cylinder loop, a third stretching pad hydraulic cylinder loop, a fourth stretching pad hydraulic cylinder loop, a fifth stretching pad hydraulic cylinder loop, a sixth stretching pad hydraulic cylinder loop, a seventh stretching pad hydraulic cylinder loop, an eighth stretching pad hydraulic cylinder loop and a main cylinder loop,
the four stretching pad hydraulic cylinders (6) are arranged on one side of a main cylinder (14) at the same interval along the length direction of a hydraulic stretching pad (5), the circle centers of the four stretching pad hydraulic cylinders (6) on one side of the main cylinder (14) are positioned on the same straight line, the other four stretching pad hydraulic cylinders (6) are arranged on the other side of the main cylinder (14) at the same interval along the length direction of the hydraulic stretching pad (5), the circle centers of the four stretching pad hydraulic cylinders (6) on the other side of the main cylinder (14) are positioned on the same straight line, the interval between the adjacent stretching pad hydraulic cylinders (6) on one side of the main cylinder (14) is equal to the interval between the adjacent stretching pad hydraulic cylinders (6) on the other side of the main cylinder (14), and the distances between the straight lines where the stretching pad hydraulic cylinders (6) on one side of the main cylinder (14) and the other side are respectively equal;
the first stretching cushion hydraulic cylinder loop comprises a cartridge valve (1.1) with an oil port A connected to a first cover plate with a damping hole on a main pressure oil pipe (P), the oil port P is connected to a first servo valve (2.1) on an oil port B of the cartridge valve (1.1) with the damping hole, the oil port A is connected to a cartridge valve (1.2) with a second cover plate with the damping hole on the oil port B of the first servo valve (2.1), the oil port B is connected to a first hydraulic control one-way valve (9.1) on a rod cavity of the first stretching cushion hydraulic cylinder (6.1), the oil port B of the cartridge valve (1.2) with the damping hole of the second cover plate is communicated with a rodless cavity of the first stretching cushion hydraulic cylinder (6.1), the oil port A of the first hydraulic control one-way valve (9.1) is connected with the oil port A of the first servo valve (2.1), the first servo valve (2.1) T is connected to a main oil return pipe (T), and a first electromagnetic ball valve (10.1) is arranged on the first hydraulic control one-way valve (9., a P port of the first electromagnetic ball valve (10.1) is connected to the control oil pipe (X);
the first tensile pad hydraulic cylinder loop is identical to the second tensile pad hydraulic cylinder loop, the third tensile pad hydraulic cylinder loop, the fourth tensile pad hydraulic cylinder loop, the fifth tensile pad hydraulic cylinder loop, the sixth tensile pad hydraulic cylinder loop, the seventh tensile pad hydraulic cylinder loop and the eighth tensile pad hydraulic cylinder loop in principle;
the main cylinder loop comprises a cartridge valve (12.1) with an oil port A connected to a seventeenth cover plate with a damping hole on a main pressure oil pipe (P), a large-diameter servo cartridge valve (13) with an oil port A connected to the cartridge valve (12.1) with the damping hole on a seventeenth cover plate and a cartridge valve (12.2) with an eighteenth cover plate with the damping hole, wherein the oil port B of the large-diameter servo cartridge valve (13) is communicated with a working cavity of a main cylinder (14), the oil port B of the cartridge valve (12.2) with the damping hole on the eighteenth cover plate is connected in parallel to an oil way between the oil port B of the cartridge valve (12.1) with the damping hole on the seventeenth cover plate and the oil port A of the large-diameter servo cartridge valve (13), and the oil port A of the cartridge valve (12.2) with the damping hole on the eighteenth cover plate is connected to a main oil return pipe;
eight stretch and fill up and be equipped with first built-in hysteresis lag telescopic displacement sensor (4.1), the built-in hysteresis lag telescopic displacement sensor of second (4.2), the built-in hysteresis lag telescopic displacement sensor of third (4.3), the built-in hysteresis lag telescopic displacement sensor of fourth (4.4), the built-in hysteresis lag telescopic displacement sensor of fifth (4.5), the built-in hysteresis lag telescopic displacement sensor of sixth (4.6), the built-in hysteresis lag telescopic displacement sensor of seventh (4.7), the built-in hysteresis lag telescopic displacement sensor of eighth (4.8) in the pneumatic cylinder (6) respectively.
2. The eight-shaft driven multipoint hydraulic stretching pad hydraulic system according to claim 1, wherein the first stretching pad hydraulic cylinder loop further comprises a first proportional cartridge overflow valve (5.1), an oil port A of the first proportional cartridge overflow valve (5.1) is connected in parallel to an oil path between an oil port B of a cartridge valve (1.2) with a second cover plate damping hole and a rodless cavity of the first stretching pad hydraulic cylinder (6.1), an oil port B of the first proportional cartridge overflow valve (5.1) is connected to a main oil return pipe (T), and a first pressure sensor (3.1) is arranged on the oil path between the oil port B of the cartridge valve (1.2) with the second cover plate damping hole and the rodless cavity of the first stretching pad hydraulic cylinder (6.1).
3. The eight-shaft driven multipoint hydraulic stretching pad hydraulic system according to claim 1, wherein the first stretching pad hydraulic cylinder loop further comprises a first accumulator safety valve group (8.1), an oil port A of the first accumulator safety valve group (8.1) is connected in parallel to an oil path between a rod cavity of the first stretching pad hydraulic cylinder (6.1) and an oil port B of a first hydraulic control one-way valve (9.1), an oil port T of the first accumulator safety valve group (8.1) is connected to a main oil return pipe (T), and a first accumulator (7.1) is arranged on the first accumulator safety valve group (8.1).
4. An eight-shaft driven multi-point hydraulic stretching pad hydraulic system as claimed in claim 1, characterized in that a first high pressure filter (11.1) is connected in series on the oil path between the port P of the first electromagnetic ball valve (10.1) and the control oil pipe (X).
5. An eight shaft driven multi point hydraulic tensioning pad hydraulic system according to claim 4, characterized in that the first servo valve (2.1) port X is connected to the first high pressure filter (11.1) outlet port.
6. The eight-shaft driven multipoint hydraulic stretching pad hydraulic system as claimed in claim 2, wherein the cartridge valve (1.1) with the damping hole of the first cover plate, the first servo valve (2.1), the cartridge valve (1.2) with the damping hole of the second cover plate and the first proportional cartridge overflow valve (5.1) are connected to an oil drain pipe (Y).
7. The eight-shaft driven multipoint hydraulic stretching pad hydraulic system as claimed in claim 1, wherein the signal output ends of all the built-in hysteresis telescopic displacement sensors are connected to the signal input end of a decoupling controller, and the signal output ends of the decoupling controller are respectively connected to the signal input end of each servo valve.
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| CN114103240B (en) * | 2021-11-12 | 2023-07-21 | 重庆江东机械有限责任公司 | Control system and control method for hydraulic press stretching pad |
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| CN2632368Y (en) * | 2003-07-10 | 2004-08-11 | 天津市天锻压力机有限公司 | Precision numerical control stretching hydropress shaping correcting controller |
| CN1976770A (en) * | 2004-06-24 | 2007-06-06 | 米勒魏因加滕股份公司 | Hybrid drawing cushion facility |
| CN102086893A (en) * | 2010-12-28 | 2011-06-08 | 深圳华强数码电影有限公司 | Multi-axis hydraulic synchronization control system, method and device |
| CN108343647A (en) * | 2018-01-30 | 2018-07-31 | 太原理工大学 | A kind of anti-bias load hydraulic rolling cut type metal sheet shearing machine hydraulic system |
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| US8348249B2 (en) * | 2008-10-07 | 2013-01-08 | Dadco, Inc. | Reaction device for forming equipment |
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| CN2632368Y (en) * | 2003-07-10 | 2004-08-11 | 天津市天锻压力机有限公司 | Precision numerical control stretching hydropress shaping correcting controller |
| CN1976770A (en) * | 2004-06-24 | 2007-06-06 | 米勒魏因加滕股份公司 | Hybrid drawing cushion facility |
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Effective date of registration: 20200824 Address after: 035404 Shenshan Xiang Guan Guan Ying Cun, Dingxiang County, Xinzhou City, Shanxi Province Patentee after: Shanxi Zhonggong Heavy Forging Co., Ltd Address before: 030024 West Street, Taiyuan, Shanxi, No. 79, No. Patentee before: Taiyuan University of Technology |
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Inventor after: He Dongping Inventor after: Zhang Zhixiong Inventor after: Wang Tao Inventor after: Ren Zhongkai Inventor after: Han Jianchao Inventor after: Liu Yuanming Inventor after: Xie Jiaquan Inventor after: Ma Xiaobao Inventor after: Fu Xiaobin Inventor before: He Dongping Inventor before: Wang Tao Inventor before: Ren Zhongkai Inventor before: Han Jianchao Inventor before: Liu Yuanming Inventor before: Xie Jiaquan Inventor before: Ma Xiaobao Inventor before: Fu Xiaobin Inventor before: Zhang Zhixiong |