Intelligent control system for semi-solid extrusion casting machine

Abstract

This invention discloses an intelligent control system for a semi-solid extrusion casting machine, comprising an oil tank, a power system, a circulating cooling system, a first accumulator group, and a second accumulator group. The power system includes a first main pump and a second main pump connected to the oil tank. In this invention, all three sets of digital high-frequency response proportional servo valves have differential pressure compensation functions. Through pressure compensation, a constant differential pressure is maintained between ports P and A or P and B of the digital hydraulic servo valve. When the opening of the hydraulic servo valve remains stable, a constant working flow can be provided under load fluctuations, avoiding load effects within a certain differential pressure range. An ultra-high pressure continuous pressurization extrusion cylinder is formed by a booster cylinder, a three-position four-way electro-hydraulic proportional directional valve, and accumulators, enabling infinitely adjustable ultra-high pressure continuous pressurization. Using accumulators as the power source reduces installed power and saves energy.

Description

Technical Field

[0001] This invention relates to the field of metal semi-solid forming equipment technology, specifically to an intelligent control system for a semi-solid extrusion casting machine. Background Technology

[0002] Semi-solid metal forming refers to metal forming that utilizes the excellent rheological properties of the semi-solid region of a metal during a two-phase transition from solid to liquid or from liquid to solid. The core technology involves achieving a non-dendritic structure in the solid-liquid mixture slurry or billet, transforming alloy dendrites into spherical or near-spherical crystals, and refining and spheroidizing the solid phase. The alloy microstructure typically contains spherical, near-spherical, or equiaxed crystals of 10–100 μm, exhibiting very low flow resistance and excellent formability.

[0003] Semi-solid metal forming is mainly applied to high-density, high-airtightness, and high-strength semi-solid extrusion casting products, including passenger car wheel rims, commercial car wheel rims, and symmetrical, multi-movable inserts requiring functional components, as well as heat dissipation housings in the 5G communication field. It is centered around semi-solid extrusion casting machines. From a mechanical perspective, semi-solid extrusion casting machines mainly perform two actions: mold locking and extrusion. The mold locking mechanism primarily opens and closes the mold, locking it during the injection and holding stages to prevent slurry overflow. A high-quality mold locking mechanism design is fundamental to improving the performance of semi-solid extrusion casting machines. The extrusion mechanism pushes the semi-solid slurry into the mold cavity, filling and shaping it into a casting. Its structural characteristics determine key parameters during the die casting process, such as extrusion speed, extrusion specific pressure, and extrusion time, directly affecting the semi-solid filling morphology and its movement characteristics within the cavity, thus influencing the quality of the extruded casting.

[0004] Extrusion casting machines with excellent clamping and extrusion mechanisms are a reliable guarantee for obtaining high-quality extrusion castings. With the continuous improvement of technology, the requirements for dimensional accuracy and production efficiency of extrusion castings are also increasing. This demands that semi-solid extrusion casting machine control systems possess technical characteristics such as high control precision, high level of intelligence, high integration, and good energy efficiency. Currently, the hydraulic systems of domestic extrusion casting machines use traditional proportional servo valves. Their response speed cannot fully meet the needs of extrusion casting operations, and they lack differential pressure compensation functions, failing to compensate for pressure fluctuations in the hydraulic system, resulting in a load effect within a certain differential pressure range. Summary of the Invention

[0005] The purpose of this invention is to provide an intelligent control system for a semi-solid extrusion casting machine, which uses digital proportional valve servo technology in conjunction with a digital shaft controller to achieve valve-integrated closed-loop shaft control function.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A semi-solid extrusion casting machine intelligent control system includes an oil tank, a power system, a circulating cooling system, a first accumulator group, and a second accumulator group. The power system includes a first main pump and a second main pump connected to the oil tank. A first cartridge-type directional valve is installed on the connecting pipeline between the first and second main pumps, allowing the first and second main pumps to operate individually or simultaneously. The first main pump is connected to two ejector cylinders symmetrically installed on both sides of the lower die via a first three-position four-way electro-hydraulic proportional directional valve. The first main pump is connected to two return cylinders installed between the upper and lower dies via a return cylinder inlet control valve. The first main pump is connected to a demolding cylinder installed near the lower die via a first three-position four-way solenoid directional valve. The first main pump is connected to the rodless chamber of the extrusion cylinder via a second three-position four-way electro-hydraulic proportional directional valve. The first main pump is connected to the rod chamber of the extrusion cylinder via a third three-position four-way electro-hydraulic proportional directional valve; the front end of the piston rod of the extrusion cylinder extends into the lifting cylinder, and the lifting cylinder and the extrusion cylinder are located below the lower die. The rodless chamber of the extrusion cylinder is connected in series with the booster cylinder; the rodless chamber of the booster cylinder is connected to the first accumulator group via a third cartridge directional valve, and the rod chamber of the booster cylinder is connected to the second accumulator group via a cartridge directional valve group consisting of a fifth, a sixth, and a seventh cartridge directional valve. The second accumulator group is connected to the rod chamber of the extrusion cylinder via a first, a second, and a third digital high-frequency response proportional servo valve. Both the first and second accumulator groups are connected to the second main pump via oil lines.

[0008] Preferably, the first main pump is connected to the tilting cylinder via a third three-position four-way solenoid directional valve. The piston rod of the tilting cylinder is hinged to the side wall of the extrusion cylinder. The bottom of the extrusion cylinder is hinged to the extrusion mechanism feeding device of the extrusion casting machine via a hinge support. The piston rod of the tilting cylinder extends or retracts to push the extrusion cylinder to tilt or stand upright.

[0009] Preferably, the first accumulator group and the second accumulator group are connected in series. The first accumulator group includes a first accumulator, and a first accumulator charging valve group is installed on the connecting pipe between the first accumulator and the oil tank. The first accumulator is connected to a first gas storage cylinder. The second accumulator group includes a second accumulator, and a second accumulator charging valve group is installed on the connecting pipe between the second accumulator and the oil tank. The second accumulator is connected to a second gas storage cylinder.

[0010] Preferably, the circulating cooling system includes a screw pump connected to a drive motor, the screw pump's inlet pipe being connected to an oil tank, and a hydraulic filter, a cooling device, and a first check valve being installed sequentially on the screw pump's outlet pipe, with the end of the outlet pipe being connected to the oil tank.

[0011] Preferably, the first main pump includes a first variable pump and a first fixed displacement pump connected to the first servo motor. A first cartridge unloading valve is installed on the connection line between the first variable pump and the first cartridge directional valve, and a second cartridge unloading valve is installed on the connection line between the first fixed displacement pump and the first cartridge directional valve.

[0012] Preferably, the second main pump includes a second metering pump and a third metering pump connected to the second servo motor. A third cartridge unloading valve is installed on the connection line between the second metering pump and the first cartridge reversing valve, and a fourth cartridge unloading valve is installed on the connection line between the third metering pump and the first cartridge reversing valve.

[0013] The beneficial effects of this invention are as follows:

[0014] 1. In this invention, the first, second, and third digital high-frequency response proportional servo valves all have differential pressure compensation functions. Through pressure compensation, a constant differential pressure is maintained between ports P and A or P and B of the digital hydraulic servo valve. When the opening of the hydraulic servo valve remains stable, a constant working flow can be provided under load fluctuations, avoiding load effects within a certain differential pressure range. The extrusion cylinder, composed of a booster cylinder, a three-position four-way electro-hydraulic proportional directional valve, and an accumulator, can achieve stepless adjustable ultra-high pressure continuous boosting. Using an accumulator as a power source can reduce the installed power and save energy.

[0015] 2. The flow rate provided by the two main pumps of this invention is proportional to the speed of the servo motor. When the overflow loss and throttling loss are large during the mold locking, pressure holding, and standby conditions of the extrusion casting machine, the power source and the working conditions of the actuator cylinder can be matched by controlling the speed of the servo motor and the set pressure of the overflow valve, thereby reducing the overflow loss and throttling loss.

[0016] 3. This invention uses a servo motor to power the main pump, and the operation of the main pump can be controlled according to the requirements of process parameters to provide suitable hydraulic oil to each cylinder in the system to meet production requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the control system of the present invention;

[0018] In the diagram: 1. Oil tank; 2. First servo motor; 3. First variable pump; 4. First fixed displacement pump; 5. Second servo motor; 6. Second fixed displacement pump; 7. Third fixed displacement pump; 8. Drive motor; 9. Screw pump; 10. Hydraulic filter; 11. Cooling device; 12. First check valve; 13. Second check valve; 14. First unloading valve; 15. Third check valve; 16. Second unloading valve; 17. Fourth check valve; 18. Third unloading valve; 19. Fifth check valve; 20. Fourth unloading valve; 21. First cartridge directional valve; 22. Fifth unloading valve; 23. Return cylinder inlet control valve; 24. First three-position four-way solenoid directional valve; 25. 26. Air filter; 27. Mold locking cylinder; 28. Return cylinder; 29. ​​Ejection cylinder; 30. Demolding cylinder; 31. First three-position four-way electro-hydraulic proportional directional valve; 32. Third accumulator; 33. Second three-position four-way solenoid directional valve; 34. Pressure gauge; 35. First ball valve; 36. Tilting cylinder; 37. Sixth check valve; 38. Seventh check valve; 39. Second hydraulic filter; 40. Third three-position four-way solenoid directional valve; 41. Second three-position four-way electro-hydraulic proportional directional valve; 42. Third three-position four-way electro-hydraulic proportional directional valve; 43. Eighth check valve; 44. Hydraulic control check valve; 45. Booster cylinder; 46. Extrusion cylinder; 47. First cartridge type 47. Second cartridge check valve; 48. Second cartridge directional control valve; 49. Throttle valve; 50. First relief valve; 51. Ninth check valve; 52. First two-position three-way solenoid directional control valve; 53. First relief valve; 54. Fourth three-position four-way electro-hydraulic proportional directional control valve; 55. First accumulator charging valve assembly; 56. Second accumulator charging valve assembly; 57. First accumulator; 58. First shut-off valve; 59. First gas cylinder; 60. Second accumulator; 61. Second shut-off valve; 62. Second gas cylinder; 63. Third cartridge directional control valve; 64. Third relief valve; 65. Second two-position three-way solenoid directional control valve; 66. Third two-position three-way solenoid valve. 67. Magnetic directional valve; 68. Fourth relief valve; 69. Fourth cartridge directional valve; 70. Second ball valve; 71. First digital high-frequency response proportional servo valve; 72. Second digital high-frequency response proportional servo valve; 73. Third digital high-frequency response proportional servo valve; 74. Tenth check valve; 75. Eleventh check valve; 76. Twelfth check valve; 77. Fifth three-position four-way electro-hydraulic proportional directional valve; 78. Fifth cartridge directional valve; 79. Sixth cartridge directional valve; 80. Seventh cartridge directional valve; 81. Thirteenth check valve; 82. Fourteenth check valve; 83. Third hydraulic filter; 84. Fourth two-position three-way solenoid directional valve; 85. Lifting cylinder. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] A semi-solid extrusion casting machine intelligent control system includes an oil tank 1, a power system, a circulating cooling system, a first accumulator group, and a second accumulator group. The power system includes a first main pump and a second main pump connected to the oil tank 1. A first cartridge-type directional valve 21, which can switch the operation of the first and second main pumps individually or simultaneously, is installed on the connecting pipeline of the first and second main pumps. The first main pump is connected to two ejection cylinders 28 symmetrically installed on both sides of the lower die through a first three-position four-way electro-hydraulic proportional directional valve 30. The first main pump is connected to two return cylinders 27 installed between the upper and lower dies through a return cylinder inlet control valve 23. The first main pump is connected to a demolding cylinder 29 installed near the lower die through a first three-position four-way solenoid directional valve 24. The first main pump is connected to the rodless chamber of the extrusion cylinder 45 through a second three-position four-way electro-hydraulic proportional directional valve 40. The first main pump is connected to a third... A three-position four-way electro-hydraulic proportional directional valve 41 is connected to the rod chamber of the extrusion cylinder 45; the front end of the piston rod of the extrusion cylinder 45 extends into the lifting cylinder 84, the lifting cylinder 84 and the extrusion cylinder 45 are located below the lower die, and the rodless chamber of the extrusion cylinder 45 is connected in series with the booster cylinder 44; the rodless chamber of the booster cylinder 44 is connected to the first accumulator group through the third cartridge directional valve 63, and the rod chamber of the booster cylinder 44 is connected to the second accumulator group through a cartridge directional valve group consisting of the fifth cartridge directional valve 77, the sixth cartridge directional valve 78, and the seventh cartridge directional valve 79; the second accumulator group is connected to the rod chamber of the extrusion cylinder 45 through the first digital high-frequency response proportional servo valve 70, the second digital high-frequency response proportional servo valve 71, and the third digital high-frequency response proportional servo valve 72; both the first accumulator group and the second accumulator group are connected to the second main pump through oil lines.

[0021] The first main pump is connected to the tilting cylinder 35 via the third three-position four-way solenoid directional valve 39. The piston rod of the tilting cylinder 35 is hinged to the side wall of the extrusion cylinder 45. The bottom of the extrusion cylinder 45 is hinged to the extrusion mechanism feeding device of the extrusion casting machine via a hinge support. The piston rod of the tilting cylinder 35 extends or retracts to push the extrusion cylinder 45 to tilt or stand upright.

[0022] The first accumulator group and the second accumulator group are connected in series. The first accumulator group includes a first accumulator 57. A first accumulator charging valve group 55 is installed on the connecting pipe between the first accumulator 57 and the oil tank 1. The first accumulator 57 is connected to the first gas storage cylinder 59. The second accumulator group includes a second accumulator 60. A second accumulator charging valve group 56 is installed on the connecting pipe between the second accumulator 60 and the oil tank 1. The second accumulator 60 is connected to the second gas storage cylinder 62.

[0023] The circulating cooling system includes a screw pump 9 connected to a drive motor 8. The inlet pipe of the screw pump 9 is connected to the oil tank 1. A hydraulic filter 10, a cooling device 11, and a first check valve 12 are installed sequentially on the outlet pipe of the screw pump 9. The end of the outlet pipe is connected to the oil tank 1.

[0024] The first main pump includes a first variable pump 3 and a first fixed pump 4 connected to the first servo motor 2. A first cartridge unloading valve 14 is installed on the connection line between the first variable pump 3 and the first cartridge reversing valve 21. A second cartridge unloading valve 16 is installed on the connection line between the first fixed pump 4 and the first cartridge reversing valve 21.

[0025] The second main pump includes a second metering pump 6 and a third metering pump 7 connected to the second servo motor 5. A third cartridge unloading valve 18 is installed on the connection line between the second metering pump 6 and the first cartridge reversing valve 21. A fourth cartridge unloading valve 20 is installed on the connection line between the third metering pump 7 and the first cartridge reversing valve 21.

[0026] The working process of this invention is as follows:

[0027] Mold-locking control:

[0028] When the fourth three-position four-way electro-hydraulic proportional directional valve 54 is connected, the first cartridge check valve 46 is opened, the mold-locking action begins, hydraulic oil enters the rodless chamber of the mold-locking cylinder 26, and the mechanism begins to move. The second cartridge directional valve 48 opens, and the hydraulic oil in the rod chamber of the mold-locking cylinder 26 flows back to the oil tank 1 through the second cartridge directional valve 48. The mold-locking cylinder 26 travels a certain distance, triggering the limit switch, and the second cartridge directional valve 48 closes. At this time, the hydraulic oil in the rod chamber of the mold-locking cylinder 26 returns to the rodless chamber of the mold-locking cylinder 26 through the second cartridge check valve 47, realizing differential fast mold-locking and low-pressure mold-locking of the mold-locking cylinder. When the mold-locking cylinder 26 continues to move, the change in the mold-opening / locking speed triggers the limit switch again, the second cartridge directional valve 48 opens, the differential is canceled, and slow-speed and high-pressure mold-locking are realized.

[0029] Mold opening control:

[0030] When the fourth three-position four-way electro-hydraulic proportional directional valve 54 and the first two-position three-way solenoid directional valve 52 are connected, the first cartridge-type check valve 46 is opened, and hydraulic oil enters the rod chamber of the mold-locking cylinder 26. The return cylinder inlet control valve 23 is opened, and the rod chamber of the return cylinder 27 is filled with hydraulic oil, and the mold opening action begins. Overcoming the mold-locking force, the mechanism begins to move. The hydraulic oil in the rodless chamber of the mold-locking cylinder 26 flows back to the oil tank 1 through the second cartridge-type directional valve 48. The mold-locking cylinder 26 runs to the mold opening limit switch position, and the mold opening stops.

[0031] Extrusion control:

[0032] The extrusion system of the semi-solid extrusion casting machine includes an ejector cylinder 28, a demolding cylinder 29, a tilting cylinder 35, an extrusion cylinder 45, and a lifting cylinder 84, which perform the extrusion process.

[0033] (1) Lifting cylinder rises: When the left electromagnet of the second three-position four-way solenoid valve 32 is turned on, the lifting cylinder 84 begins to rise. Hydraulic oil flows into the rodless chamber of the lifting cylinder 84, and the oil in the rod chamber flows back to the oil tank 1 through the second three-position four-way solenoid valve 32. When the lifting cylinder 84 moves to the limit switch, the first ball valve 34 is energized and opened, and the third accumulator 31 realizes the rising and holding.

[0034] (2) Lifting cylinder descends: When the right electromagnet of the second three-position four-way solenoid valve 32 is turned on, the lifting cylinder 84 begins to descend. Hydraulic oil flows into the rod chamber of the lifting cylinder 84, and the oil in the rodless chamber flows back to the oil tank 1 through the second three-position four-way solenoid valve 32. When the lifting cylinder 84 moves to the limit switch, the right electromagnet of the second three-position four-way solenoid valve 32 is de-energized, and the descent stops.

[0035] (3) Extrusion cylinder control: Connect the first digital high-frequency response proportional servo valve 70, the second digital high-frequency response proportional servo valve 71 and the third digital high-frequency response proportional servo valve 72 to start the extrusion action. The hydraulic oil enters the extrusion cylinder 45 from the second accumulator 60 through the first digital high-frequency response proportional servo valve 70, the second digital high-frequency response proportional servo valve 71 and the third digital high-frequency response proportional servo valve 72. The oil in the rod chamber of the extrusion cylinder 45 is discharged through the first digital high-frequency response proportional servo valve 70. The operator controls the extrusion speed by adjusting the valve opening of the digital high-frequency response proportional servo valve. When the extrusion cylinder 45 reaches the final designated position, the operator quickly reduces the valve opening of the digital high-frequency response proportional servo valve and opens the third cartridge directional valve 63 under power. The first accumulator 57 pressurizes the circuit, and the hydraulic oil flows into the booster cylinder 44 for pressurized extrusion. After extrusion, the first digital high-frequency response proportional servo valve 70, the second digital high-frequency response proportional servo valve 71, and the third digital high-frequency response proportional servo valve 72 are all de-energized and closed, and the second three-position four-way electro-hydraulic proportional directional valve 40 and the third three-position four-way electro-hydraulic proportional directional valve 41 are connected. The oil is discharged through the hydraulic control check valve 43, and the extrusion cylinder 45 retracts.

[0036] (4) Attitude control of the extrusion cylinder:

[0037] The extension or retraction of the piston rod of the tilting cylinder 35 is controlled by the third- or third-position four-way solenoid directional valve 39, thereby enabling the extrusion cylinder 45 to be in a vertical or horizontal position. The feeding device feeds the semi-solid slurry into the pressure chamber. After feeding is completed, the tilting cylinder actuates to tilt the extrusion cylinder back into position. By switching the vertical or horizontal position of the extrusion cylinder 45, the semi-solid slurry can be injected into the tilted pressure chamber from the material cup. After the extrusion unit tilts back, it docks with the mold, and the punch fills the semi-solid slurry upwards. This improves the semi-solid filling shape and movement characteristics in the cavity, thus improving the quality of the casting.

[0038] In this invention, the first, second, and third digital high-frequency response proportional servo valves all have differential pressure compensation functions. Through pressure compensation, a constant differential pressure is maintained between ports P and A or P and B of the digital hydraulic servo valve. When the opening of the hydraulic servo valve remains stable, a constant working flow can be provided under load fluctuations, avoiding load effects within a certain differential pressure range. The extrusion cylinder, composed of a booster cylinder, a three-position four-way electro-hydraulic proportional directional valve, and an accumulator, can achieve stepless adjustable ultra-high pressure continuous boosting. Using an accumulator as the power source can reduce the installed power and save energy.

[0039] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, based on the technical teachings provided by the present invention and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of the present invention.

Claims

1. An intelligent control system for a semi-solid extrusion casting machine, characterized in that: The system includes an oil tank (1), a power system, a circulating cooling system, a first accumulator group, and a second accumulator group. The power system includes a first main pump and a second main pump connected to the oil tank (1). A first cartridge-type directional valve (21) is installed on the connecting pipeline of the first main pump and the second main pump, which can switch the first main pump and the second main pump to work individually or simultaneously. The first main pump is connected to two ejector cylinders (28) symmetrically installed on both sides of the lower mold through a first three-position four-way electro-hydraulic proportional directional valve (30). The first main pump is connected to two return cylinders (27) installed between the upper mold and the lower mold through a return cylinder inlet control valve (23). The first main pump is connected to a demolding cylinder (29) installed near the lower mold through a first three-position four-way solenoid directional valve (24). The first main pump is connected to the rodless chamber of the extrusion cylinder (45) through a second three-position four-way electro-hydraulic proportional directional valve (40). The first main pump is connected to a third three-position four-way electro-hydraulic proportional directional valve (41). The rod chamber of the extrusion cylinder (45) is connected; the front end of the piston rod of the extrusion cylinder (45) extends into the lifting cylinder (84), the lifting cylinder (84) and the extrusion cylinder (45) are located below the lower die, and the rodless chamber of the extrusion cylinder (45) is connected in series with the booster cylinder (44); the rodless chamber of the booster cylinder (44) is connected to the first accumulator group through the third cartridge reversing valve (63), and the rod chamber of the booster cylinder (44) is connected to the fifth cartridge reversing valve (77). The cartridge reversing valve group consisting of the sixth cartridge reversing valve (78) and the seventh cartridge reversing valve (79) is connected to the second accumulator group. The second accumulator group is connected to the rod chamber of the extrusion cylinder (45) through the first digital high-frequency response proportional servo valve (70), the second digital high-frequency response proportional servo valve (71) and the third digital high-frequency response proportional servo valve (72). Both the first accumulator group and the second accumulator group are connected to the second main pump through oil pipelines.

2. The intelligent control system for a semi-solid extrusion casting machine according to claim 1, characterized in that: The first main pump is connected to the tilting cylinder (35) via the third three-position four-way solenoid directional valve (39). The piston rod of the tilting cylinder (35) is hinged to the side wall of the extrusion cylinder (45). The bottom of the extrusion cylinder (45) is hinged to the extrusion mechanism feeding device of the extrusion casting machine via a hinge support. The piston rod of the tilting cylinder (35) extends or retracts to push the extrusion cylinder (45) to tilt or stand upright.

3. The intelligent control system for a semi-solid extrusion casting machine according to claim 1 or 2, characterized in that: The first accumulator group and the second accumulator group are connected in series. The first accumulator group includes a first accumulator (57). A first accumulator charging valve group (55) is installed on the connecting pipe between the first accumulator (57) and the oil tank (1). The first accumulator (57) is connected to the first gas storage cylinder (59). The second accumulator group includes a second accumulator (60). A second accumulator charging valve group (56) is installed on the connecting pipe between the second accumulator (60) and the oil tank (1). The second accumulator (60) is connected to the second gas storage cylinder (62).

4. The intelligent control system for a semi-solid extrusion casting machine according to claim 3, characterized in that: The circulating cooling system includes a screw pump (9) connected to a drive motor (8). The inlet pipe of the screw pump (9) is connected to the oil tank (1). A hydraulic filter (10), a cooling device (11) and a first check valve (12) are installed in sequence on the outlet pipe of the screw pump (9). The end of the outlet pipe is connected to the oil tank (1).

5. The intelligent control system for a semi-solid extrusion casting machine according to claim 4, characterized in that: The first main pump includes a first variable pump (3) and a first fixed pump (4) connected to the first servo motor (2). A first cartridge unloading valve (14) is installed on the connecting pipeline between the first variable pump (3) and the first cartridge reversing valve (21). A second cartridge unloading valve (16) is installed on the connecting pipeline between the first fixed pump (4) and the first cartridge reversing valve (21).

6. The intelligent control system for a semi-solid extrusion casting machine according to claim 5, characterized in that: The second main pump includes a second metering pump (6) and a third metering pump (7) connected to the second servo motor (5). A third cartridge unloading valve (18) is installed on the connection line between the second metering pump (6) and the first cartridge reversing valve (21). A fourth cartridge unloading valve (20) is installed on the connection line between the third metering pump (7) and the first cartridge reversing valve (21).

Images