Die casting local pressure control device capable of automatic correction

Abstract

The present invention discloses a die-casting local pressurization control device capable of automatic correction, which includes a hydraulic unit and a pressurization unit arranged on one side of the injection chamber of the die-casting module. The pressurization unit includes a housing, a piston, a pressurization rod, a push rod, a scheduling disk, a pressurization pipe and a proportional regulating valve. The interior of the housing has a hydraulically connected chamber and a plurality of pressure regulating chambers. The push rod is located in the pressure regulating chamber to push the piston to slide along the inner wall of the hydraulic chamber to drive the pressurization rod to move in the injection chamber of the die-casting module. One end of the scheduling disk close to the housing has pressurization pipes matching the number and positions of the pressure regulating chambers to connect each pressure regulating chamber to the scheduling disk through the pressurization pipes. A proportional regulating valve is arranged in the pressurization pipe to control the flow rate of the hydraulic oil input into each pressure regulating chamber to correct the local output pressure of the pressurization rod according to the pressurization rules of the die-casting module, effectively regulating the pressurization speed and avoiding shrinkage holes caused by over-fast or over-slow pressurization during die-casting.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting control, and particularly to a die-casting local pressurization control device that can be automatically corrected. Background Art

[0002] The die-casting process is a process of organically combining and comprehensively applying three major elements: a die-casting machine, a die-casting mold, and an alloy. Generally, when die-casting thin-walled castings, the flow resistance in the cavity is large, and the thickness of the inner gate is also relatively thin, so it has a large resistance. Therefore, a larger filling specific pressure is required to ensure the required inner gate speed. At present, when die-casting parts with a very large difference in wall thickness, shrinkage cavities or shrinkage porosity defects often appear in the thick-walled parts. Therefore, the die-casting method of local pressurization introduced in the die-casting process can improve the above defects.

[0003] In the traditional local pressurization process, a hydraulic cylinder is usually used as the power source to press the pouring liquid into the cavity under the pushing force of the piston rod to make it quickly form. However, the existing hydraulic facilities cannot effectively adjust the pressurization speed, resulting in the inability to eliminate shrinkage cavities whether the pressurization is too fast or too slow. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a die-casting local pressurization control device that can be automatically corrected to solve the technical problems mentioned in the prior art.

[0005] A die-casting local pressurization control device that can be automatically corrected includes a hydraulic unit and a pressurization unit arranged on one side of the injection chamber of the die-casting module. The pressurization unit includes:

[0006] A housing having a hydraulically connected chamber and a plurality of pressure regulating chambers inside. The plurality of pressure regulating chambers are respectively arranged along the extending direction of the center line of the hydraulic chamber. The outer periphery of the housing has an oil injection port, and the oil injection port is connected to one end of the hydraulic chamber far from the pressure regulating chamber;

[0007] A piston slidably arranged along the inner wall of the hydraulic chamber, and a first seal is arranged between the opposite surfaces of the piston and the inner side wall of the hydraulic chamber to achieve dynamic sealing;

[0008] A pressurization rod arranged in the hydraulic chamber. One end of the pressurization rod is connected to the end of the piston far from the pressure regulating chamber, and the other end of the pressurization rod penetrates through the inner wall of the housing and extends into the injection chamber of the die-casting module to press the pouring liquid injected into the injection chamber into the die-casting module according to the pressurization rule of the die-casting module;

[0009] The push rod is slidably installed in the pressure regulating chamber. One end of the push rod extends out of the pressure regulating chamber and is connected to the piston. A second seal is provided between the end of the push rod away from the piston and the opposite surface of the inner wall of the hydraulic chamber to achieve dynamic sealing;

[0010] A scheduling disk is provided at one end of the outer periphery of the housing near the pressure regulating chamber. The inside of the scheduling disk is a hollow structure. One end of the scheduling disk close to the housing has a pressure adding pipe that matches the number and position of the pressure regulating chambers to communicate each pressure regulating chamber with the scheduling disk through the pressure adding pipe. A proportional regulating valve is provided in the pressure adding pipe to control the flow rate of the hydraulic oil input into each pressure regulating chamber to correct the local output pressure of the pressure adding rod according to the pressure adding rule of the die-casting module;

[0011] The hydraulic output ends of the hydraulic unit are respectively connected to the inner wall of the scheduling disk and the oil injection port through control oil circuits. The control oil circuits are used to control the hydraulic unit to input hydraulic oil into the scheduling disk or the oil injection port to drive the pressure adding rod to move in the injection chamber of the die-casting module.

[0012] Optionally, the pressure adding unit further includes a control module. The control module is respectively connected to the proportional regulating valve, the control oil circuit and the hydraulic unit. The control module generates a pressure adding instruction according to the pressure adding rule of the die-casting module to control the hydraulic unit to input hydraulic oil into the scheduling disk through the control oil circuit, and controls the opening degrees of a plurality of proportional regulating valves to adjust the flow rate of the hydraulic oil input into the pressure regulating chamber to correct the output pressure of the pressure adding rod according to the pressure adding rule of the die-casting module, so as to drive the pressure adding rod to extend into the injection chamber of the die-casting module at a pressure adding speed corresponding to the pressure adding rule of the die-casting module to press the pouring liquid into the die-casting module to realize die-casting operation;

[0013] When die-casting operation is completed inside the die-casting module, the control module generates a pressure unloading instruction to control the hydraulic unit to input hydraulic oil into the oil injection port through the control oil circuit to drive the pressure adding rod to withdraw from the injection chamber of the die-casting module to realize the pressure unloading action.

[0014] Optionally, the control module has:

[0015] A setting subunit, which sets the output pressure change parameter and the voltage stabilization duration of the pressure adding rod according to the pressure adding rule of the die-casting module;

[0016] An operation processor, connected to the setting subunit, the proportional regulating valve, and the control oil circuit, is configured to obtain the actual oil pressure of the control oil circuit and calculate the opening quantity of the proportional regulating valve and the opening degree of each proportional regulating valve according to the output pressure change parameter of the pressure rod to generate corresponding pressurization instructions;

[0017] A clock processor, connected to the setting subunit and the operation processor, is configured to couple the voltage stabilization duration of the pressure rod into the pressurization instruction to generate a unloading instruction;

[0018] A controller, connected to the operation processor, the clock processor, the proportional regulating valve, the control oil circuit, and the hydraulic unit, is configured to separately issue the pressurization instruction and the unloading instruction to the proportional regulating valve, the control oil circuit, and the hydraulic unit.

[0019] Optionally, the control oil circuit includes:

[0020] An electromagnetic directional valve, the oil inlet of the electromagnetic directional valve is connected to the oil outlet of the hydraulic unit, a first electronic valve is installed at the first oil outlet of the electromagnetic directional valve, and a second electronic valve is installed at the second oil outlet of the electromagnetic directional valve;

[0021] A first oil circuit, one end of the first oil circuit is connected to the first electronic valve, and the other end of the first oil circuit is connected to the oil injection port;

[0022] A second oil circuit, one end of the second oil circuit is connected to the second electronic valve, and the other end of the second oil circuit is connected to the scheduling panel;

[0023] An oil pressure sensor, the oil pressure sensor is installed on the second oil circuit, the oil pressure sensor is connected to the control module, and the oil pressure sensor is configured to collect the actual oil pressure of the second oil circuit and upload it to the control module;

[0024] Both the first electronic valve and the second electronic valve are three-way directional valves, and the remaining ends of the first electronic valve and the second electronic valve are respectively connected to the oil return port of the hydraulic unit through oil return pipes.

[0025] Optionally, the hydraulic unit includes:

[0026] A fuel tank, the interior of the fuel tank has an oil storage chamber, an oil return port is provided at the top of the oil storage chamber, a fuel supply port is provided at the bottom of the oil storage chamber, and the oil return port and the fuel supply port respectively penetrate through the outer periphery of the fuel tank;

[0027] A hydraulic pump unit is installed on the outer periphery of the fuel tank. The inlet of the hydraulic pump unit is connected to the oil supply port through a pipeline, and the outlet of the hydraulic pump unit is connected to the inlet of the electromagnetic directional valve through a pipeline.

[0028] The hydraulic pump unit has a control unit, which is connected to the oil pressure sensor. The control unit adjusts the output oil pressure of the hydraulic pump unit according to the actual oil pressure of the control oil circuit to keep the actual oil pressure of the control oil circuit at a constant value.

[0029] Optionally, the linear displacement stroke of the pressure regulating chamber is greater than that of the hydraulic chamber.

[0030] Optionally, one end of the pressure boosting pipe close to the housing has a first air exchange hole, and a third electronic valve is installed in the first air exchange hole. The third electronic valve is connected to the control module.

[0031] Optionally, one end of the hydraulic chamber close to the pressure boosting chamber has a second air exchange hole, and a fourth electronic valve is installed in the second air exchange hole. The fourth electronic valve is connected to the control module.

[0032] The beneficial effects that the present invention can produce include:

[0033] The automatically correctable die-casting local pressure boosting control device provided by the present invention divides the input pressure of the hydraulic unit by designing multiple pressure regulating chambers to correct the local output pressure of the pressure boosting rod according to the pressure boosting rules of the die-casting module, effectively adjusting the pressure boosting speed and avoiding shrinkage holes caused by too fast or too slow pressure boosting during die-casting. Among them, when the local pressure requirement of the die-casting module increases, the proportional regulating valve is used to reduce the amount of hydraulic oil dominated by the pressure regulating chamber to increase the output pressure inside a single pressure regulating chamber to increase the local output pressure of the pressure boosting rod; when the local pressure requirement of the die-casting module decreases, the proportional regulating valve is used to increase the amount of hydraulic oil dominated by the pressure regulating chamber to reduce the output pressure inside a single pressure regulating chamber to reduce the local output pressure of the pressure boosting rod. If the local pressure adjustment range of the die-casting module is small, the opening degree of the proportional regulating valve can be adjusted to accurately control the hydraulic oil output flow of the pressure boosting pipe, thereby adjusting the output pressure of the pressure boosting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the automatically correctable die-casting local pressure boosting control device of the present invention;

[0035] Figure 2 It is a schematic internal structure diagram of the pressure boosting unit in the present invention;

[0036] Figure 3 It is a schematic frame principle diagram of the control module of the pressure boosting unit in the present invention;

[0037] In the figure: 1. housing, 2. hydraulic chamber, 3. pressure regulating chamber, 4. oil injection port, 5. piston, 6. pressurizing rod, 7. push rod, 8. die-casting module, 9. injection chamber, 10. scheduling disc, 11. pressurizing pipe, 12. proportional regulating valve, 13. control module, 14. setting sub-unit, 15. arithmetic processor, 16. clock processor, 17. controller, 18. electromagnetic reversing valve, 19. first oil circuit, 20. first electronic valve, 21. second oil circuit, 22. second electronic valve, 23. oil pressure sensor, 24. fuel tank, 25. hydraulic pump unit, 26. first air vent hole, 27. third electronic valve, 28. second air vent hole, 29. fourth electronic valve, 30. oil return pipe. Specific implementation mode

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1 - 3As shown in the figure, the present invention provides a die-casting local pressurization control device capable of automatic correction, which includes a hydraulic unit and a pressurization unit arranged on one side of the injection chamber 9 of the die-casting module 8. The pressurization unit includes a housing 1, a piston 5, a pressurization rod 6, a push rod 7, a scheduling disc 10, and a proportional regulating valve 12. Inside the housing 1, there are a hydraulic chamber 2 and a plurality of pressure regulating chambers 3 that are interconnected. The plurality of pressure regulating chambers 3 are respectively arranged along the extending direction of the center line of the hydraulic chamber 2. The outer periphery of the housing 1 has an oil injection port 4, and the oil injection port 4 is communicated with one end of the hydraulic chamber 2 far from the pressure regulating chambers 3; the piston 5 is slidably arranged along the inner wall of the hydraulic chamber 2, and a first seal is arranged between the opposite surfaces of the piston 5 and the inner side wall of the hydraulic chamber 2 to achieve dynamic sealing; the pressurization rod 6 is arranged in the hydraulic chamber 2, one end of the pressurization rod 6 is connected to the end of the piston 5 far from the pressure regulating chambers 3, and the other end of the pressurization rod 6 penetrates through the inner wall of the housing 1 and extends into the injection chamber 9 of the die-casting module 8 to press the pouring liquid injected into the injection chamber 9 into the die-casting module 8 according to the pressurization rule of the die-casting module 8; the push rod 7 is slidably installed in the pressure regulating chamber 3, one end of the push rod 7 extends out of the pressure regulating chamber 3 and is connected to the piston 5, and a second seal is arranged between the end of the push rod 7 far from the piston 5 and the opposite surface of the inner side wall of the hydraulic chamber 2 to achieve dynamic sealing; a scheduling disc 10 is arranged on the outer periphery of the housing 1 and near the pressure regulating chambers 3. The inside of the scheduling disc 10 is a hollow structure. One end of the scheduling disc 10 close to the housing 1 has a pressurization pipe 11 that matches the number and position of the pressure regulating chambers 3 to communicate each pressure regulating chamber 3 with the scheduling disc 10 through the pressurization pipe 11. A proportional regulating valve 12 is installed in the pressurization pipe 11 to control the flow rate of the hydraulic oil input into each pressure regulating chamber 3 to correct the local output pressure of the pressurization rod 6 according to the pressurization rule of the die-casting module 8; the hydraulic output ends of the hydraulic unit are respectively connected to the inner wall of the scheduling disc 10 and the oil injection port 4 through control oil circuits. The control oil circuits are used to control the hydraulic unit to input hydraulic oil into the scheduling disc 10 or the oil injection port 4 to drive the pressurization rod 6 to move in the injection chamber 9 of the die-casting module 8.

[0040] In the above, by designing multiple pressure regulating chambers 3 to divide the input pressure of the hydraulic unit to correct the local output pressure of the pressure rod 6 according to the pressurization rule of the die-casting module 8, the pressurization speed is effectively adjusted, and the shrinkage cavity phenomenon caused by too fast or too slow pressurization during the die-casting process is avoided. Specifically, when the local pressure requirement of the die-casting module 8 increases, the proportional regulating valve 12 is used to reduce the amount of hydraulic oil dominated by the pressure regulating chamber 3 to increase the output pressure inside a single pressure regulating chamber 3 to increase the local output pressure of the pressure rod 6; similarly, when the local pressure requirement of the die-casting module 8 decreases, the proportional regulating valve 12 is used to increase the amount of hydraulic oil dominated by the pressure regulating chamber 3 to reduce the output pressure inside a single pressure regulating chamber 3 to reduce the local output pressure of the pressure rod 6. Among them, if the local pressure adjustment range of the die-casting module 8 is small, the output flow rate of the hydraulic oil in the pressure pipe 11 can be accurately controlled by adjusting the opening degree of the proportional regulating valve 12, and then the output pressure of the pressure rod 6 can be adjusted. It should be noted that the pressure inside the pressure regulating chamber 3 participating in dominating the hydraulic oil remains the same, that is, the opening degrees of the proportional regulating valve 12 are the same.

[0041] Further, the pressurizing unit further includes a control module 13. The control module 13 is respectively connected to the proportional regulating valve 12, the control oil circuit, and the hydraulic unit. The control module 13 generates a pressurizing instruction according to the pressurizing rule of the die-casting module 8 to control the hydraulic unit to input hydraulic oil into the scheduling disk 10 through the control oil circuit, and controls the opening degree of the plurality of proportional regulating valves 12 to adjust the flow rate of the hydraulic oil input into the pressure regulating chamber 3 to correct the output pressure of the pressurizing rod 6 according to the pressurizing rule of the die-casting module 8, so as to drive the pressurizing rod 6 to extend into the injection chamber 9 of the die-casting module 8 at a pressurizing speed corresponding to the pressurizing rule of the die-casting module 8 to press the pouring liquid into the die-casting module 8 to realize die-casting operation; when the die-casting operation is completed inside the die-casting module 8, the control module 13 generates a unloading instruction to control the hydraulic unit to input hydraulic oil into the oil injection port 4 through the control oil circuit to drive the pressurizing rod 6 to withdraw from the injection chamber 9 of the die-casting module 8 to realize the unloading action. Specifically, the control module 13 has a setting subunit 14, an arithmetic processor 15, a clock processor 16, and a controller 17. The setting subunit 14 sets the output pressure change parameter and the voltage stabilization duration of the pressurizing rod 6 according to the pressurizing rule of the die-casting module 8; the arithmetic processor 15 is connected to the setting subunit 14, the proportional regulating valve 12, and the control oil circuit, and is used to obtain the actual oil pressure of the control oil circuit and calculate the opening number of the proportional regulating valve 12 and the opening degree of each proportional regulating valve 12 according to the output pressure change parameter of the pressurizing rod 6 to generate a corresponding pressurizing instruction; the clock processor 16 is connected to the setting subunit 14 and the arithmetic processor 15 to couple the voltage stabilization duration of the pressurizing rod 6 into the pressurizing instruction to generate a unloading instruction; the controller 17 is connected to the arithmetic processor 15, the clock processor 16, the proportional regulating valve 12, the control oil circuit, and the hydraulic unit, and is used to send the pressurizing instruction and the unloading instruction to the proportional regulating valve 12, the control oil circuit, and the hydraulic unit respectively to control the output pressure of the pressurizing rod 6 according to the pressurizing rule of the die-casting module 8.

[0042] In the above, the pressurization rule has: according to the structural changes of the casting, obtaining the changes in the wall thickness and dimensional parameters of the casting to generate corresponding advancing strokes and advancing speeds, which are stored in the memory. The setting subunit 14 obtains the advancing stroke and advancing speed of the pressurization rule from the memory to set the output pressure change parameters and the pressure stabilization duration of the pressure rod 6; at the same time, the setting subunit 14 sends the control signal corresponding to the output pressure change parameters of the pressure rod 6 to the arithmetic processor 15, so that the arithmetic processor 15 calculates the pressure difference between the actual oil pressure of the control oil circuit and the output pressure change parameters of the pressure rod 6, and evenly distributes the pressure difference to the pressure regulating chambers 3 of the hydraulic oil participating in the control of the scheduling disc 10 this time to calculate the opening number of the proportional control valves 12 and the opening degree of each proportional control valve 12 to generate corresponding pressurization instructions, thereby effectively controlling the output pressure of the pressure rod 6 to regulate the advancing stroke and advancing speed of the pressure rod 6, facilitating effective pressurization and forming of the thick and large cross-section of the casting during the die-casting process. It should be noted that the pressure stabilization duration is the residence time of the pressure rod 6 in the injection chamber 9 after pressurization and forming, to ensure better forming of the pouring liquid, and the pressure stabilization duration is set to 2 - 5 s.

[0043] In the above, one end of the pressure rod 6 located inside the injection chamber 9 is the injection piston 5 of the die-casting module 8. The die-casting module 8 has a moving die and a fixed die. After the moving die and the fixed die are closed, an injection cavity is formed between their opposite faces. One end of the injection chamber 9 away from the pressure rod 6 communicates with the injection cavity. The outer periphery of the injection chamber 9 has a pouring port communicating with its interior, to inject the pouring liquid into the injection chamber 9 through the pouring port and drive the injection piston 5 by the pressurization unit to press the pouring liquid into the injection cavity for pressurization and forming according to the advancing stroke and advancing speed corresponding to the pressurization rule of the die-casting module 8.

[0044] Furthermore, the control oil circuit includes an electromagnetic directional valve 18, a first oil circuit 19, a second oil circuit 21, and an oil pressure sensor 23. The oil inlet of the electromagnetic directional valve 18 is connected to the oil outlet of the hydraulic unit. A first electronic valve 20 is installed at the first oil outlet of the electromagnetic directional valve 18, and a second electronic valve 22 is installed at the second oil outlet of the electromagnetic directional valve 18; one end of the first oil circuit 19 is connected to the first electronic valve 20, and the other end of the first oil circuit 19 is connected to the oil injection port 4; one end of the second oil circuit 21 is connected to the second electronic valve 22, and the other end of the second oil circuit 21 is connected to the scheduling disc 10; the oil pressure sensor 23 is installed on the second oil circuit 21, and the oil pressure sensor 23 is connected to the control module 13. The oil pressure sensor 23 is used to collect the actual oil pressure of the second oil circuit 21 and upload it to the control module 13; both the first electronic valve 20 and the second electronic valve 22 are three-way directional valves, and the remaining ends of the first electronic valve 20 and the second electronic valve 22 are respectively connected to the oil return port of the hydraulic unit through the oil return pipe 30.

[0045] In the above, the electromagnetic reversing valve 18 is used to switch the oil supply path of the hydraulic unit to the first oil path 19 and the second oil path 21, so that when any one of the first oil path 19 and the second oil path 21 is the oil supply pipeline, the other oil path is the return oil pipeline 30; wherein, when the first oil path 19 is the oil supply pipeline, the first electronic valve 20 connects the oil outlet of the electromagnetic reversing valve 18 to the first oil path 19, and the second electronic valve 22 connects the other oil outlet of the electromagnetic reversing valve 18 to the return oil pipeline 30, so that the hydraulic oil in the pressure regulating chamber 3 flows back to the hydraulic unit to ensure the stable retraction of the pressure rod 6; similarly, when the second oil path 21 is the oil supply pipeline, the second electronic valve 22 connects the oil outlet of the electromagnetic reversing valve 18 to the second oil path 21, and the first electronic valve 20 connects the other oil outlet of the electromagnetic reversing valve 18 to the return oil pipeline 30, so that the hydraulic oil in the hydraulic chamber 2 flows back to the hydraulic unit to ensure the stable extension of the pressure rod 6.

[0046] Further, the hydraulic unit includes an oil tank 24 and a hydraulic pump set 25. The inside of the oil tank 24 has an oil storage chamber. An oil return port is provided at the top of the oil storage chamber, and an oil supply port is provided at the bottom of the oil storage chamber. The oil return port and the oil supply port respectively penetrate the outer periphery of the oil tank 24; the hydraulic pump set 25 is installed on the outer periphery of the oil tank 24. The oil inlet of the hydraulic pump set 25 is connected to the oil supply port through a pipeline, and the oil outlet of the hydraulic pump set 25 is connected to the oil inlet of the electromagnetic reversing valve 18 through a pipeline; the hydraulic pump set 25 has a control unit, and the control unit is connected to the oil pressure sensor 23. The control unit adjusts the output oil pressure of the hydraulic pump set 25 according to the actual oil pressure of the control oil path to keep the actual oil pressure of the control oil path at a constant value.

[0047] In the above, a filter screen is detachably installed in the oil return port to filter impurities in the hydraulic oil returning to the oil tank 24, and the filter screen is replaced and cleaned once after several die-casting cycles.

[0048] In the above, the oil tank 24 is made of iron material, and the wall thickness of the oil tank 24 is 0.6 - 1.2 cm. In order to ensure that the oil temperature of the oil tank 24 is within a constant range during use, a spiral water cooling pipe is provided on the outer periphery of the oil tank 24, and a coolant at 10 - 15 °C is continuously introduced into the spiral water cooling pipe during the pressurization process to cool and lower the temperature of the hydraulic oil, so as to avoid the temperature of the hydraulic oil returning to the oil tank 24 being too high, causing the temperature of the oil tank 24 and the overall pressurization unit to rise, which is not conducive to the continuous progress of the work.

[0049] Further, the linear displacement stroke of the pressure regulating chamber 3 is greater than that of the hydraulic chamber 2 to ensure that the piston 5 reaches the maximum displacement stroke. One end of the pressure pipe 11 close to the housing 1 has a first air exchange hole 26, and a third electronic valve 27 is installed in the first air exchange hole 26. The third electronic valve 27 is connected to the control module 13. When the second electronic valve 22 on the pressure pipe 11 is in the closed state, the control module 13 controls the third electronic valve 27 on one side of the corresponding pressure pipe 11 to be in the open state, so as to ensure that the inside of the pressure regulating chamber 3 is in a stable pressure state; when the second electronic valve 22 on the pressure pipe 11 is in the open state to allow hydraulic oil to flow into the inside of the pressure regulating chamber 3, the control module 13 controls the third electronic valve 27 on one side of the corresponding pressure pipe 11 to be in the closed state. One end of the hydraulic chamber 2 close to the pressure chamber has a second air exchange hole 28, and a fourth electronic valve 29 is installed in the second air exchange hole 28. The third electronic valve 27 is connected to the control module 13; when the device is started, the control module 13 controls the fourth electronic valve 29 to be normally open to avoid the formation of negative pressure on the side of the hydraulic chamber 2 close to the pressure regulating chamber 3 when the piston 5 moves, causing operation failure of the pressurizing unit.

Claims

1. An automatically correctable die-casting local pressurization control device, comprising a hydraulic unit and a pressurization unit arranged on one side of an injection chamber (9) of a die-casting module (8), characterized in that, The pressurizing unit includes: A housing (1) having a hydraulically connected chamber (2) and a plurality of pressure regulating chambers (3) inside. The plurality of pressure regulating chambers (3) are respectively arranged along the extending direction of the central axis of the hydraulically connected chamber (2). The outer periphery of the housing (1) has an oil injection port (4), and the oil injection port (4) is connected to one end of the hydraulically connected chamber (2) away from the pressure regulating chambers (3); A piston (5) slidably arranged along the inner wall of the hydraulically connected chamber (2). A first seal is provided between the opposite surfaces of the piston (5) and the inner side wall of the hydraulically connected chamber (2) to achieve dynamic sealing; A pressure rod (6) arranged inside the hydraulically connected chamber (2). One end of the pressure rod (6) is connected to the end of the piston (5) away from the pressure regulating chambers (3), and the other end of the pressure rod (6) penetrates through the inner wall of the housing (1) and extends into the injection chamber (9) of the die-casting module (8) to inject the pouring liquid in the injection chamber (9) into the die-casting module (8) according to the pressurizing rules of the die-casting module (8); A push rod (7) slidably installed inside the pressure regulating chamber (3). One end of the push rod (7) extends out of the pressure regulating chamber (3) and is connected to the piston (5). A second seal is provided between the opposite surface of the end of the push rod (7) away from the piston (5) and the inner side wall of the hydraulically connected chamber (2) to achieve dynamic sealing; A scheduling disc (10) is provided at one end of the outer periphery of the housing (1) near the pressure regulating chambers (3). The inside of the scheduling disc (10) is a hollow structure. One end of the scheduling disc (10) near the housing (1) has pressure pipes (11) matching the number and positions of the pressure regulating chambers (3) to connect each pressure regulating chamber (3) to the scheduling disc (10) through the pressure pipes (11). A proportional control valve (12) is provided inside the pressure pipes (11) to control the flow rate of the hydraulic oil input into each pressure regulating chamber (3) to correct the local output pressure of the pressure rod (6) according to the pressurizing rules of the die-casting module (8); The hydraulic output ends of the hydraulic unit are respectively connected to the inner wall of the scheduling disc (10) and the oil injection port (4) through control oil circuits. The control oil circuits are used to control the hydraulic unit to input hydraulic oil into the scheduling disc (10) or the oil injection port (4) to drive the pressure rod (6) to move inside the injection chamber (9) of the die-casting module (8).

2. The automatically correctable die-casting local pressure control device according to claim 1, characterized in that, The pressurizing unit further includes a control module (13). The control module (13) is respectively connected to the proportional regulating valve (12), the control oil circuit and the hydraulic unit. The control module (13) generates a pressurizing instruction according to the pressurizing rule of the die-casting module (8) to control the hydraulic unit to input hydraulic oil into the scheduling disc (10) through the control oil circuit, and controls the opening degree of a plurality of the proportional regulating valves (12) to adjust the flow rate of the hydraulic oil input into the pressure regulating chamber (3) so as to correct the output pressure of the pressure rod (6) according to the pressurizing rule of the die-casting module (8), thereby driving the pressure rod (6) to extend into the injection chamber (9) of the die-casting module (8) at a pressurizing speed corresponding to the pressurizing rule of the die-casting module (8) to press the pouring liquid into the die-casting module (8) to realize die-casting operation; When the die-casting operation is completed inside the die-casting module (8), the control module (13) generates a unloading instruction to control the hydraulic unit to input hydraulic oil into the oil injection port (4) through the control oil circuit to drive the pressure rod (6) to withdraw from the injection chamber (9) of the die-casting module (8) to realize the unloading action.

3. The die-casting local pressurization control device capable of automatic correction according to claim 2, characterized in that, The control module (13) has: A setting subunit (14) for setting the output pressure change parameter and the voltage stabilizing duration of the pressure rod (6) according to the pressurizing rule of the die-casting module (8); An arithmetic processor (15) connected to the setting subunit (14), the proportional regulating valve (12) and the control oil circuit, for obtaining the actual oil pressure of the control oil circuit and calculating the opening number of the proportional regulating valves (12) and the opening degree of each of the proportional regulating valves (12) according to the output pressure change parameter of the pressure rod (6) to generate a corresponding pressurizing instruction; A clock processor (16) connected to the setting subunit (14) and the arithmetic processor (15) to couple the voltage stabilizing duration of the pressure rod (6) into the pressurizing instruction to generate a unloading instruction; A controller (17) connected to the arithmetic processor (15), the clock processor (16), the proportional regulating valve (12), the control oil circuit and the hydraulic unit, for respectively sending the pressurizing instruction and the unloading instruction to the proportional regulating valve (12), the control oil circuit and the hydraulic unit.

4. The automatically correctable die-casting local pressure control device according to claim 2, characterized in that, The control oil circuit includes: An electromagnetic directional valve (18). The oil inlet of the electromagnetic directional valve (18) is connected to the oil outlet of the hydraulic unit. A first electronic valve (20) is installed at the first oil outlet of the electromagnetic directional valve (18), and a second electronic valve (22) is installed at the second oil outlet of the electromagnetic directional valve (18); A first oil circuit (19). One end of the first oil circuit (19) is connected to the first electronic valve (20), and the other end of the first oil circuit (19) is connected to the oil injection port (4); A second oil circuit (21). One end of the second oil circuit (21) is connected to the second electronic valve (22), and the other end of the second oil circuit (21) is connected to the scheduling disc (10); An oil pressure sensor (23), the oil pressure sensor (23) is installed on the second oil passage (21), the oil pressure sensor (23) is connected to the control module (13), and the oil pressure sensor (23) is used to collect the actual oil pressure of the second oil passage (21) and upload it to the control module (13); The first solenoid valve (20) and the second solenoid valve (22) are both three-way reversing valves, and the remaining ends of the first solenoid valve (20) and the second solenoid valve (22) are respectively connected to the oil return port of the hydraulic unit through an oil return pipe (30).

5. The automatically correctable die-casting local pressurization control device according to claim 4, wherein The hydraulic unit includes: A fuel tank (24), the interior of the fuel tank (24) has an oil storage chamber, the top of the oil storage chamber is provided with an oil return port, the bottom of the oil storage chamber is provided with an oil supply port, and the oil return port and the oil supply port respectively penetrate the outer periphery of the fuel tank (24); A hydraulic pump set (25), the hydraulic pump set (25) is installed on the outer periphery of the fuel tank (24), the inlet of the hydraulic pump set (25) is connected to the oil supply port through a pipeline, and the outlet of the hydraulic pump set (25) is connected to the inlet of the electromagnetic reversing valve (18) through a pipeline; The hydraulic pump set (25) has a control unit, the control unit is connected to the oil pressure sensor (23), and the control unit adjusts the output oil pressure of the hydraulic pump set (25) according to the actual oil pressure of the control oil passage to keep the actual oil pressure of the control oil passage at a constant value.

6. The die-casting local pressurization control device capable of automatic correction according to claim 1, characterized in that, The linear displacement stroke of the pressure regulating chamber (3) is greater than the linear displacement stroke of the hydraulic chamber (2).

7. The die-casting local pressurization control device capable of automatic correction according to claim 2, wherein, One end of the pressure pipe (11) close to the housing (1) has a first air exchange hole (26), a third solenoid valve (27) is installed in the first air exchange hole (26), and the third solenoid valve (27) is connected to the control module (13).

8. The die-casting local pressurization control device capable of automatic correction according to claim 2, wherein, One end of the hydraulic chamber (2) close to the pressure regulating chamber has a second air exchange hole (28), a fourth solenoid valve (29) is installed in the second air exchange hole (28), and the fourth solenoid valve (29) is connected to the control module (13).

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