CN117161346B - Hydraulic system suitable for semisolid injection molding of magnesium alloy - Google Patents
Hydraulic system suitable for semisolid injection molding of magnesium alloy Download PDFInfo
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- CN117161346B CN117161346B CN202311248624.0A CN202311248624A CN117161346B CN 117161346 B CN117161346 B CN 117161346B CN 202311248624 A CN202311248624 A CN 202311248624A CN 117161346 B CN117161346 B CN 117161346B
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 16
- 238000001746 injection moulding Methods 0.000 title claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 91
- 239000007924 injection Substances 0.000 claims abstract description 91
- 239000003921 oil Substances 0.000 claims abstract description 67
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000004146 energy storage Methods 0.000 claims description 19
- 238000005461 lubrication Methods 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a hydraulic system suitable for magnesium alloy semi-solid injection molding, which comprises a basic power source, a main energy accumulator, a first injection control module, an injection oil cylinder, a second injection control module, a first oil tank, a first control valve and a third control valve which are connected with the basic power source, wherein the injection oil cylinder comprises a front cavity and a rear cavity, the first injection control module and the second injection control module are respectively connected with the front cavity and the rear cavity, and the third control valve is also connected with the rear cavity, and the control of different injection stages of hydraulic oil in the injection oil cylinder is realized through the power loss of each control valve. The hydraulic system provided by the invention has the advantages of good sealing performance and high injection response and precision, and the control of the injection of the oil cylinder in the hydraulic system is improved.
Description
Technical Field
The invention relates to the technical field of die casting machines, in particular to a hydraulic system suitable for semisolid injection molding of magnesium alloy.
Background
Semi-solid injection molding of magnesium alloys is a method of injecting a semi-solid metal charge into a mold, by controlling the temperature and fluidity of the metal charge, to effect the formation of a part. Specifically, the deformed magnesium alloy blank is converted from dendrite-shaped structure to equiaxial structure at semi-solid temperature, so that the mechanical property of the magnesium alloy is greatly improved.
The magnesium alloy semi-solid injection molding equipment applies the injection molding principle of an injection molding machine, and heats the magnesium scraps conveyed in a chip shape in a charging barrel, and the magnesium scraps are not contacted with air to be changed into a semi-molten state with good fluidity, so that the magnesium scraps are injected into a mold for molding in the state, and a hydraulic system for closed-loop control of injection cannot be avoided in the process of injecting glue.
In the hydraulic system in the prior art, the oil drainage risk when the accumulator valve is closed is not considered, and meanwhile, the single proportional valve is arranged on one side in the injection process to control, so that the response is not fast enough when the injection and the braking actions are carried out easily. In addition, especially to the injection hydraulic system of thick wall and weight are heavier, most do not possess and provide storage backpressure function, have influenced hydraulic system's leakproofness, and then influence injection performance, also influence simultaneously and be connected with it the storage equipment, cause problem such as shake when the storage process appears.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the hydraulic system suitable for the semisolid injection molding of the magnesium alloy, which fully considers the injection process and hydraulic considerations of the semisolid injection molding of the magnesium alloy, and is provided with the bilateral control module so as to change the injection speed in the hydraulic system and meet the injection requirements under different working conditions. And simultaneously, back pressure is provided, and the injection performance is improved.
The injection hydraulic system of the technology is specially used for the semisolid injection molding of magnesium alloy,
The invention is realized by the following technical scheme:
The utility model provides a be applicable to semi-solid injection molding hydraulic system of magnesium alloy, includes basic power supply, main energy storage ware, first injection control module, injection hydro-cylinder, second injection control module and first oil tank that connect gradually, still includes first control valve and the third control valve of being connected with basic power supply, the injection hydro-cylinder includes front chamber and back chamber, second injection control module and first injection control module are connected with front chamber and back chamber respectively, the third control valve is also connected with back chamber, through controlling each injection control module and control valve in order to realize the speed control to the injection hydro-cylinder.
Preferably, an energy storage control module is further connected between the basic power source and the main energy accumulator, the energy storage control module comprises a first pilot reversing valve, a two-way cartridge valve and a second one-way valve for preventing hydraulic oil from flowing back, wherein the first pilot reversing valve, the two-way cartridge valve and the second one-way valve are sequentially connected, and the second one-way valve is further connected with the two-way cartridge valve.
Preferably, the energy storage control module further comprises a first one-way valve for avoiding pressure recoil, one end of the first one-way valve is connected with the two-way cartridge valve, and the other end of the first one-way valve is connected with the joint of the first pilot reversing valve and the two-way cartridge valve.
Preferably, the first injection control module and the second injection control module are respectively provided with a first proportional throttle valve and a second proportional throttle valve for controlling injection speed, the first proportional throttle valve is respectively connected with the rear cavity and the two-way cartridge valve, and the second proportional throttle valve is connected with the front cavity.
Preferably, the system further comprises a shuttle valve connected to both the main accumulator and the first control valve, said shuttle valve further being connected to the base power source.
Preferably, the injection oil cylinder further comprises a lubrication cavity, and the first proportional throttle valve is further provided with an electromagnet for changing the working state of the first proportional throttle valve through on-off of the electromagnet, and the electromagnet is further connected with the lubrication cavity.
Preferably, an oil return port of the electromagnet and an oil drain port of the lubrication cavity are also connected with a second oil tank in parallel, and the second oil tank is also connected with a third control valve.
Preferably, a second control valve is further connected between the first control valve and the third control valve.
Preferably, a proportional pressure valve for providing a back pressure condition is also connected to the second control valve, the proportional pressure valve also being connected to the second tank.
Preferably, the first proportional throttle valve, the second proportional throttle valve and the two-way cartridge valve are respectively provided with an LVDT linear variable differential displacement sensor.
Compared with the prior art, the hydraulic system for semisolid injection molding of the magnesium alloy has the following advantages and remarkable effects:
1. According to the invention, the injection oil cylinder is controlled in a two-way manner through the first injection control module and the second injection control module, so that the control of oil cylinder injection is improved, and meanwhile, the response speed of the injection system in braking action is improved through the control of single proportion in the first injection control module and the second injection control module;
2. According to the invention, the first one-way valve and the second one-way valve are arranged on the energy storage control module, so that the tightness of the injection oil cylinder in the hydraulic system is improved when the main energy storage is subjected to injection energy release action, and the oil leakage risk existing when the main energy storage valve is closed is avoided;
3. The invention also provides a proportional pressure valve for providing back pressure selection requirement in the oil way, so that smooth transition is realized for a device for carrying out material conveying by using the system, and the conditions of blockage, accumulation or excessively rapid flow are avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an overall oil circuit diagram of an injection system according to the present invention.
The codes in the figure are respectively:
1-a basic power source; 2-an energy storage control module; 2.1-first pilot reversing valve, 2.2-two-way cartridge valve, 2.3-first one-way valve, 2.4-second one-way valve and 2.5-damping; 3-a main accumulator; 4-first injection control module, 4.1-first proportional throttle valve, 4.2-electromagnet and 4.3-second energy accumulator; the device comprises a 5-injection oil cylinder, a 5.1-front cavity, a 5.2-rear cavity, a 5.3-lubrication cavity and a 5.4-screw; 6-second injection control module, 6.1-second pilot reversing valve, 6.2-third pilot reversing valve, 6.3-third one-way valve, 6.4-second proportional throttle valve and 6.5-first accumulator; 7-injection quick oil discharge valve, 7.1-fourth pilot reversing valve and 7.2-main valve; 8-a first control valve, 8.1-a fifth pilot reversing valve and 8.2-a first main control valve; 9-second control valve, 9.1-sixth pilot reversing valve, 9.2-second main control valve and 9.3-fourth one-way valve; 10-third control valve, 10.1-seventh pilot reversing valve, 10.2-third main control valve; 11-shuttle valve; 12-a proportional pressure valve; 13-a first oil tank, 14-a fourth control valve; 15-a fifth one-way valve; 16-a sixth one-way valve; 17-a second oil tank; 18-a third accumulator.
Detailed Description
Embodiment one:
An injection hydraulic system is shown in fig. 1, and comprises a first oil way for storing energy, wherein the first oil way comprises a basic power source 1, an energy storage control module 2 and a main energy accumulator 3 which are sequentially connected, and the energy storage control module 2 comprises a first pilot reversing valve 2.1 and a two-way cartridge valve 2.2. The first oil circuit further includes an accumulator air pressure sensor R102 connected to the main accumulator 3, a pressure gauge B101, and a valve V150 for switching the main accumulator 3.
Corresponding to the first phase of operation, the charge boost phase: when the first pilot reversing valve 2.1 is powered on, the two-way cartridge valve 2.2 is opened, after the hydraulic system is connected into the basic power source 1 from the point P, the basic power source 1 enters the energy accumulator 3 through the two-way cartridge valve 2.2 to store energy, and after the set value is reached, the related energy storage action is automatically stopped. After the energy storage is finished, the first pilot reversing valve 2.1 is powered off, and the two-way cartridge valve 2.2 is correspondingly closed.
The inlet and the outlet of the two-way cartridge valve 2.2 are respectively provided with a first one-way valve 2.3 and a second one-way valve 2.4, specifically, the first one-way valve 2.3 and the second one-way valve 2.4 are all cartridge type one-way valves, and when the two-way cartridge valve 2.2 is closed, pilot oil from a basic power source 1 and an energy accumulator 3 of the system can reliably close the two-way cartridge valve 2.2 through a first pilot reversing valve 2.1; meanwhile, the added first one-way valve 2.3 can also avoid pressure recoil caused by injection energy release; the second one-way valve is added to prevent the oil from flowing back, so that the pressure loss caused by the backflow of the hydraulic oil of the energy accumulator 3 or the basic power source 1 when the injection is released can be prevented.
The system also comprises a second oil way for carrying out slow injection, wherein the second oil way comprises a first control valve 8, a third control valve 10, an injection oil cylinder 5, a second injection control module 6 and a sixth one-way valve 16 which are connected with the basic power source 1. 8 comprises a fifth pilot reversing valve 8.1 and a first main control valve 8.2, the third control valve 10 comprises a seventh pilot reversing valve 10.1 and a third main control valve 10.2, and the injection cylinder 5 comprises a front cavity 5.1, a rear cavity 5.2, a lubrication cavity 5.3 and a screw 5.4. The connection of the lubrication chamber 5.3 and the sixth non-return valve 16 is also connected with a seventh pilot reversing valve 10.1. The second injection control module 6 comprises a second pilot reversing valve 6.1, a third pilot reversing valve 6.2, a third one-way valve 6.3, a second proportional throttle valve 6.4, a first energy accumulator 6.5, a voltmeter B102 and an oxygen valve V151 which are respectively connected with the first energy accumulator 6.5.
Corresponding to the second phase of operation, the slow shot phase: at this time, the oil way is in a closed loop state, and at this time, the oil inlet of the injection oil cylinder 5 is synchronously controlled by 8 and 10 so as to push the screw 5.4 to enter from the rear cavity 5.2 and advance forward (the left side in the drawing is the front of the oil cylinder). Specifically, the fifth pilot reversing valve 8.1 and the seventh pilot reversing valve 10.1 are powered on, corresponding to the opening of the first main control valve 8.2 and the third main control valve 10.2, the hydraulic oil continuously provided for the injection system 1 sequentially passes through the first main control valve 8.2 and the third main control valve 10.2 and enters the rear cavity 5.2; correspondingly, when the pushing screw 5.4 moves forward to the front cavity 5.1, the second pilot reversing valve 6.1 is also electrified, so that the second proportional throttle valve 6.4 is opened, and the hydraulic oil in the front cavity 5.1 discharges excessive hydraulic oil to the first oil tank 13 through the control of the second proportional throttle valve 6.4. Further, the outlet of the second proportional throttle valve 6.4 is also connected with a first accumulator 6.5 and a nitrogen valve V151 connected with the first accumulator 6.5 and capable of being filled with nitrogen for gas compensation. The second proportional throttle valve 6.4 is also connected to a first accumulator 6.5 for supplying pilot oil to the proportional valve to provide hydraulic pressure when the second proportional throttle valve 6.4 is operated to be opened.
The system further comprises a third oil way for quick injection, wherein the third oil way comprises a first injection control module 4 connected between the energy storage control module 2 and the main energy accumulator 3, and further comprises an injection oil cylinder 5 and a second injection control module 6 which are sequentially connected with the first injection control module 4. The first injection control module 4 comprises a first proportional throttle valve 4.1, an electromagnet 4.2 and a second accumulator 4.3; the first proportional throttle valve 4.1 is connected to the rear chamber 5.2. A sixth one-way valve 16 is also connected between the main accumulator 3 and the first injection control module 4.
In particular, a shuttle valve 11 is further provided between the first control valves 8 and 2 to reliably close the valve 8 during the rapid injection phase, said shuttle valve 11 being further connected to the base power source 1.
Corresponding to the third phase of operation, the fast shot phase: after the slow injection reaches a set position, entering a fast injection stage; on the premise that 1 continuously provides hydraulic oil for the injection system, the accumulator 3 also enables the accumulator 3 to discharge energy through a sixth one-way valve which is opened after power is obtained, and at the moment, the fifth pilot reversing valve 8.1 is closed through the shuttle valve 11; specifically, the first proportional throttle valve 4.1 is opened, hydraulic oil in the accumulator 3 enters the rear cavity 5.2 through the first proportional throttle valve 4.1, and correspondingly, hydraulic oil in the front cavity 5.1 is discharged to the first oil tank 13 (oil discharge in the same slow speed stage) of the oil tank through 6.4, so that the screw 5.4 is pushed to rapidly advance.
Meanwhile, the first proportional throttle valve 4.1 is also connected with the lubrication cavity 5.3 and the second energy accumulator 4.3 through the electromagnet 4.2 respectively, the oil way in the lubrication cavity 5.3 is realized through the on-off of the electromagnet 4.2, and the valve can be opened for 4.3 when hydraulic energy storage is needed. In the quick injection stage, when the first proportional throttle valve 4.1 is opened, the electromagnet is electrified to open the second energy accumulator 4.3 to provide hydraulic pressure for the first proportional throttle valve 4.1; when the first proportional throttle valve 4.1 is in a closed state, the electromagnet is powered off, pilot oil in the corresponding first proportional throttle valve 4.1 enters the lubrication cavity 5.3 through the damping V109, hydraulic oil can be provided for components such as a bearing in the lubrication cavity 5.3, and an oil tank is also connected outside the lubrication cavity 5.3.
In the stage, analog quantity signals of the first proportional throttle valve 4.1 and the second proportional throttle valve 6.4 are controlled according to the system set speed, so that the speed of the oil cylinder is controlled, and the effects of multi-section adjustable speed precise control are achieved.
Fourth stage of work, pressure maintaining: in the process of quick injection, after the set conditions of pressurized injection are met, pressure maintaining is carried out by adjusting the sizes of the first proportional throttle valve 4.1 and the second proportional throttle valve 6.4.
The system further comprises an injection quick oil discharge valve 7 connected with the second injection control module 6 and used for injection and ejection, a fourth control valve 14 is further connected between the second injection control module 6 and the injection quick oil discharge valve 7, and the injection quick oil discharge valve 7 is also connected with the screw rod 1 so as to reset the screw rod 5.4. The system also comprises a second control valve 9 connected with the first control valve 8, wherein the second control valve 9 comprises a sixth pilot reversing valve 9.1 and a second main control valve 9.2 which are sequentially connected; the sixth pilot switching valve 9.1 is further connected to a shuttle valve 11, said shuttle valve 11 being further connected to a second tank 17, a seventh pilot switching valve 10.1, respectively.
Corresponding to the fifth phase of operation, rollback reset: after the end of the cooling time, the screw 5.4 is reset. Specifically, the basic power source 1 continuously provides hydraulic oil for the injection system, the fourth pilot reversing valve 7.1 is powered, the main valve 7.2 is opened, the main valve 7.2 sequentially passes through the main valve 7.2 and the V401 to enter the main valve 5.1 so as to push the screw rod 5.4 to retract, at the moment, the screw rod rotates and simultaneously retracts, and the hydraulic oil in the rear cavity 5.2 sequentially passes through the third main control valve 10.2 and the second main control valve 9.2 to enter the second oil tank 17. Meanwhile, the screw 5.4 performs metering action, and drives a servo motor externally connected with the screw 5 to perform rotation action in the process of retreating the screw so as to convey materials forwards.
Particularly, in the prior art, oil in a rear cavity of the oil cylinder directly returns to the oil tank through the 4H8 valve when the screw rod retreats, and no back pressure control exists; the invention can be selectively controlled, and when slow material storage is needed and certain back pressure resistance is needed to be applied, the control can be performed through the proportional pressure valve and the proportional pressure valve 12; specifically, when in use, the calibration is carried out, no pressure exists at 0 voltage, and the corresponding pressure is 45bar at 10V voltage, so that the pressure selection setting of 0-45 bar of storage back pressure can be realized, the function and process adjustment are more perfect, the user selection is enriched, and the product quality is improved.
Meanwhile, the proportional throttle valve with high precision, high response (response time is less than 28 ms) and minimum hysteresis is adopted in oil inlet and oil return of the injection cylinder. The first control valve 8, the second control valve 9, the third control valve 10, the first proportional throttle valve 4.1, the second proportional throttle valve 6.4 and the two-way cartridge valve 2.2 are respectively internally provided with an LVDT linear variable differential displacement sensor, so that the valve core position can be monitored in real time.
Specifically, a pilot oil pressure release passage is further arranged between the first injection control module 4 and the energy storage control module 2, and specifically includes a control valve V118, a switch F001 and a reversing valve V113 that are sequentially connected. The pressure and flow of the pilot oil are kept stable by the power supply of D109 to open the passage, so that the stable, accurate and reliable action of the hydraulic element is ensured.
The above-mentioned various valve bodies of the present application can be used, but not limited to, the above-mentioned types, so long as the above-mentioned functions can be satisfied, and the functions of the various valve bodies can be realized by using a single valve body or a combination valve body of a plurality of valves, which are all within the protection scope of the present application; in addition, the control of the execution element in the application can be applied to die casting machines, injection molding machines and the like; the speed closed-loop control of the actuating element can be particularly applied to the control of an oil cylinder, a motor and the like; the closed-loop control of the pressure of the actuating element can be particularly applied to the control of the oil cylinder, and the closed-loop control of the pressure of the actuating element is particularly applicable to a hydraulic system for semisolid thixotropic molding of magnesium alloy.
The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the design spirit of the present invention.
Claims (2)
1. The hydraulic system is suitable for magnesium alloy semi-solid injection molding and is characterized by comprising a basic power source (1), a main energy accumulator (3), a first injection control module (4), an injection oil cylinder (5), a second injection control module (6) and a first oil tank (13) which are sequentially connected, and further comprising a first control valve (8) and a third control valve (10) which are connected with the basic power source (1), wherein the injection oil cylinder (5) comprises a front cavity (5.1) and a rear cavity (5.2), the second injection control module (6) and the first injection control module (4) are respectively connected with the front cavity (5.1) and the rear cavity (5.2), and the third control valve (10) is also connected with the rear cavity, so that the speed control of the injection oil cylinder (5) is realized by controlling each injection control module and control valve;
an energy storage control module (2) is further connected between the basic power source (1) and the main energy accumulator (3), the energy storage control module (2) comprises a first pilot reversing valve (2.1), a two-way cartridge valve (2.2) and a second one-way valve (2.4) for preventing hydraulic oil from flowing back, and the second one-way valve (2.4) is further connected with the two-way cartridge valve (2.2);
The energy storage control module (2) further comprises a first one-way valve (2.3) for avoiding pressure recoil, one end of the first one-way valve (2.3) is connected with the two-way cartridge valve (2.2), and the other end of the first one-way valve is connected with the joint of the first pilot reversing valve (2.1) and the two-way cartridge valve (2.2);
The first injection control module (4) and the second injection control module (6) are respectively provided with a first proportional throttle valve (4.1) and a second proportional throttle valve (6.4) for controlling injection speed, the first proportional throttle valve (4.1) is respectively connected with a rear cavity (5.2) and a two-way cartridge valve (2.2), and the second proportional throttle valve (6.4) is connected with a front cavity (5.1);
The connection part of the energy storage control module (2) and the main energy accumulator (3) is also provided with a shuttle valve (11) connected with the first control valve (8), and the shuttle valve (11) is also connected with the basic power source (1);
The injection oil cylinder (5) further comprises a lubrication cavity (5.3) connected with the first proportional throttle valve (4.1), an electromagnet (4.2) for changing the working state of the first proportional throttle valve (4.1) through on-off of the first proportional throttle valve (4.1) is further arranged on the first proportional throttle valve (4.1), and the electromagnet (4.2) is further connected with the second energy accumulator (4.3) and the lubrication cavity (5.3) respectively;
A second oil tank (17) is further connected to the connection part of the lubricating cavity (5.3) and the electromagnet (4.2), and the second oil tank (17) is further connected with a third control valve (10);
A second control valve (9) is also connected between the first control valve (8) and the third control valve (10);
The hydraulic control system further comprises a proportional pressure valve (12) connected with the second control valve (9) and used for providing back pressure conditions, and the proportional pressure valve (12) is also connected with a second oil tank (17).
2. The hydraulic system for semisolid injection molding of magnesium alloy according to claim 1, wherein the first control valve (8), the second control valve (9), the third control valve (10), the first proportional throttle valve (4.1), the second proportional throttle valve (6.4) and the two-way cartridge valve (2.2) are respectively internally provided with LVDT linear variable differential displacement sensors.
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| CN202311248624.0A CN117161346B (en) | 2023-09-26 | 2023-09-26 | Hydraulic system suitable for semisolid injection molding of magnesium alloy |
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| CN202311248624.0A CN117161346B (en) | 2023-09-26 | 2023-09-26 | Hydraulic system suitable for semisolid injection molding of magnesium alloy |
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| CN106438523A (en) * | 2016-08-30 | 2017-02-22 | 广东宝洋科技有限公司 | Hydraulic system and control method thereof |
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| CN111442001A (en) * | 2020-03-20 | 2020-07-24 | 宁波海天金属成型设备有限公司 | Oil circuit structure for double closed-loop control of injection speed and injection force and control mode |
| CN214814708U (en) * | 2020-12-24 | 2021-11-23 | 宁波保税区海天智胜金属成型设备有限公司 | Die opening and closing hydraulic loop system of die casting machine |
| CN115978020A (en) * | 2022-12-16 | 2023-04-18 | 合肥工业大学 | Injection hydraulic system of die casting machine based on independent load port |
| CN116696867A (en) * | 2023-06-16 | 2023-09-05 | 宁波保税区海天智胜金属成型设备有限公司 | Control loop and method for realizing hydraulic oil way differential switching synchronization |
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