Pressure casting local pressurization control device capable of automatically correcting

Abstract

The invention discloses a die-casting local pressurization control device capable of automatically correcting, which comprises a hydraulic unit and a pressurization unit arranged on one side of an injection chamber of a die-casting module, the pressurization unit comprises a shell, a piston, a pressurization rod, a push rod, a dispatching disc, a pressurization pipe and a proportioning valve, and the shell is internally provided with a hydraulic chamber and a plurality of pressure regulating chambers which are communicated with each other; the push rod is located in the pressure adjusting cavity to push the piston to slide along the inner wall of the hydraulic cavity so as to drive the pressurizing rod to move in an injection chamber of the die-casting module. Pressurizing pipes matched with the pressure regulating chambers in number and position are arranged at one end, close to the shell, of the dispatching disc, so that each pressure regulating chamber is communicated with the dispatching disc through the pressurizing pipes; the proportional regulating valve is arranged in the pressurizing pipe to control the flow of hydraulic oil input into each pressure regulating cavity so as to correct the local output pressure of the pressurizing rod according to the pressurizing rule of the die-casting module, the pressurizing speed is effectively regulated, and the shrinkage phenomenon caused by too fast or too slow pressurizing in the die-casting process is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of die casting control, in particular to a die casting local pressurization control device capable of automatic correction. Background Art

[0002] The die casting process is a process that organically combines the three major elements of die casting machine, die casting mold and alloy for comprehensive application. In general, when die casting thin-walled castings, the flow resistance in the cavity is large, and the gate is also thin, so it has a large resistance. Therefore, a large filling pressure ratio is required to ensure that the required gate speed is achieved. At present, when die casting parts with very different wall thicknesses, shrinkage holes or shrinkage defects often appear in the thick wall. For this reason, the introduction of a local pressurized die casting method in the die casting process can improve the above defects.

[0003] In the traditional local pressurization process, a hydraulic cylinder is usually used as a power source to press the casting liquid into the mold cavity under the thrust of the piston rod to quickly form it. However, the existing hydraulic facilities cannot effectively adjust the pressurization speed, resulting in the inability to eliminate the shrinkage phenomenon when the pressurization is too fast or too slow. Summary of the invention

[0004] In view of this, an object 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] The automatically correctable local pressure control device for die casting comprises a hydraulic unit and a pressure unit arranged on one side of the injection chamber of the die casting die set, wherein the pressure unit comprises:

[0006] A housing, wherein the housing has a hydraulic chamber and a plurality of pressure regulating chambers that are interconnected, wherein the plurality of pressure regulating chambers are respectively arranged along the extension direction of the center line of the hydraulic chamber, and the outer periphery of the housing has an oil filling port, wherein the oil filling port is connected to one end of the hydraulic chamber away from the pressure regulating chamber;

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

[0008] A pressurizing rod, wherein the pressurizing rod is disposed in the hydraulic chamber, one end of the pressurizing rod is connected to an end of the piston away from the pressure regulating chamber, and the other end of the pressurizing rod penetrates the inner wall of the shell and extends into the injection chamber of the die-casting die set so as to inject the casting liquid injected into the injection chamber into the die-casting die set according to the pressurization rule of the die-casting die set;

[0009] A push rod, the push rod is slidably mounted in the pressure regulating chamber, one end of the push rod extends out of the pressure regulating chamber and is connected to the piston, and a second sealing member is provided between the end of the push rod away from the piston and the opposite surface of the inner side wall of the hydraulic chamber to achieve dynamic sealing;

[0010] A scheduling disk is arranged on the outer periphery of the shell and at one end close to the pressure regulating chamber, the interior of the scheduling disk is a hollow structure, and the end of the scheduling disk close to the shell has a pressurizing pipe matching the number and position of the pressure regulating chambers so as to connect each of the pressure regulating chambers with the scheduling disk through the pressurizing pipe, and a proportional regulating valve is arranged in the pressurizing pipe to control the flow of hydraulic oil input into each of the pressure regulating chambers so as to correct the local output pressure of the pressurizing rod according to the pressurization rule of the die-casting die set;

[0011] The hydraulic output end of the hydraulic unit is connected to the inner wall of the scheduling disk and the oil filling port through a control oil circuit, and the control oil circuit is used to control the hydraulic unit to input hydraulic oil into the scheduling disk or the oil filling port to drive the pressure rod to move in the injection chamber of the die-casting mold assembly.

[0012] Optionally, the pressurizing unit further comprises a control module, which is respectively connected to the proportional regulating valve, the control oil circuit and the hydraulic unit, and the control module generates a pressurizing instruction according to the pressurizing rule of the die-casting die set to control the hydraulic unit to input hydraulic oil into the scheduling disk through the control oil circuit, and controls the opening and closing degrees of the 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 pressurizing rod according to the pressurizing rule of the die-casting die set, thereby driving the pressurizing rod to extend into the injection chamber of the die-casting die set at a pressurizing speed corresponding to the pressurizing rule of the die-casting die set to inject the casting fluid into the die-casting die set to realize the die-casting operation;

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

[0014] Optionally, the control module has:

[0015] A setting subunit, which sets the output pressure variation parameters and the pressure stabilization time of the pressure rod according to the pressure rule of the die-casting module;

[0016] an operation processor connected to the setting subunit, the proportional control valve and the control oil circuit, and used to obtain the actual oil pressure of the control oil circuit and calculate the opening number of the proportional control valve and the opening and closing degree of each proportional control valve according to the output pressure change parameter of the pressurizing rod to generate a corresponding pressurizing instruction;

[0017] A clock processor, connected to the setting subunit and the operation processor, to couple the pressure stabilization time of the pressurizing rod to the pressurizing instruction to generate a load unloading instruction;

[0018] A controller is connected to the arithmetic processor, the clock processor, the proportional control valve, the control oil circuit and the hydraulic unit, and is used to send the pressurization instruction and the unloading instruction to the proportional control valve, the control oil circuit and the hydraulic unit respectively.

[0019] Optionally, the control oil circuit includes:

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

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

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

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

[0024] The first electronic valve and the second electronic valve are both three-way reversing 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 comprises:

[0026] An oil tank, wherein the oil tank has an oil storage chamber inside, 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 circumference of the oil tank;

[0027] A hydraulic pump group, wherein the hydraulic pump group is installed on the outer periphery of the oil tank, the oil inlet of the hydraulic pump group is connected to the oil supply port through a pipeline, and the oil outlet of the hydraulic pump group is connected to the oil inlet of the electromagnetic reversing valve through a pipeline;

[0028] The hydraulic pump group has a control unit connected to the oil pressure sensor, and the control unit adjusts the output oil pressure of the hydraulic pump group 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 the linear displacement stroke of the hydraulic chamber.

[0030] Optionally, the pressurized tube has a first ventilation hole at one end close to the shell, a third electronic valve is installed in the first ventilation hole, and the third electronic valve is connected to the control module.

[0031] Optionally, the hydraulic chamber has a second ventilation hole at one end close to the pressurized chamber, a fourth electronic valve is installed in the second ventilation hole, and 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 pressurization 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 pressurization rod according to the pressurization rules of the die-casting module, effectively adjusts the pressurization speed, and avoids shrinkage caused by too fast or too slow pressurization during the die-casting process. When the local pressure requirement of the die-casting module increases, the proportional regulating valve is used to reduce the amount of hydraulic oil controlled by the pressure regulating chamber to increase the output pressure inside a single pressure regulating chamber to increase the local output pressure of the pressurization 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 controlled by the pressure regulating chamber to reduce the output pressure inside a single pressure regulating chamber to reduce the local output pressure of the pressurization rod. If the local pressure adjustment range of the die-casting module is small, the hydraulic oil output flow of the pressurization pipe can be accurately controlled by adjusting the opening and closing size of the proportional regulating valve, thereby adjusting the output pressure of the pressurization rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the die-casting local pressurization control device capable of automatic correction according to the present invention;

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

[0036] Figure 3 This is a schematic diagram of the control module framework of the pressurizing unit in the present invention;

[0037] In the figure: 1. shell, 2. hydraulic chamber, 3. pressure regulating chamber, 4. oil filling port, 5. piston, 6. pressure rod, 7. push rod, 8. die casting module, 9. injection chamber, 10. scheduling disk, 11. pressure pipe, 12. proportional control valve, 13. control module, 14. setting subunit, 15. operation 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. oil tank, 25. hydraulic pump group, 26. first ventilation hole, 27. third electronic valve, 28. second ventilation hole, 29. fourth electronic valve, 30. oil return pipe. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-Figure 3As shown, the present invention provides a die-casting local pressurization control device that can be automatically corrected, including a hydraulic unit and a pressurization unit arranged on one side of the injection chamber 9 of the die-casting die set 8, the pressurization unit includes a housing 1, a piston 5, a pressurization rod 6, a push rod 7, a scheduling disk 10 and a proportional regulating valve 12, the housing 1 has 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 extension direction of the center line of the hydraulic chamber 2, the outer periphery of the housing 1 has an oil injection port 4, the oil injection port 4 and the hydraulic chamber 1 are connected to each other. The end of the hydraulic chamber 2 away from the pressure regulating chamber 3 is connected; the piston 5 is slidably arranged along the inner wall of the hydraulic chamber 2, and a first sealing member is arranged between the piston 5 and the inner side wall opposite to the hydraulic chamber 2 to achieve dynamic sealing; a pressurizing rod 6 is arranged in the hydraulic chamber 2, one end of the pressurizing rod 6 is connected to the end of the piston 5 away from the pressure regulating chamber 3, and the other end of the pressurizing rod 6 penetrates the inner wall of the housing 1 and extends to the injection chamber 9 of the die-casting die set 8 so as to inject the casting liquid injected into the injection chamber 9 into the die-casting die according to the pressurization rule of the die-casting die set 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 sealing member is arranged between the end of the push rod 7 away from the piston 5 and the inner wall opposite to the hydraulic chamber 2 to achieve dynamic sealing; a scheduling disk 10 is arranged on the outer periphery of the housing 1 and close to the end of the pressure regulating chamber 3, the interior of the scheduling disk 10 is a hollow structure, and the end of the scheduling disk 10 close to the housing 1 has a pressurizing pipe 11 matching the number and position of the pressure regulating chamber 3 to pressurize each pressure regulating chamber 3 is connected with the scheduling disk 10 through a pressure pipe 11, and a proportional regulating valve 12 is installed in the pressure pipe 11 to control the flow of hydraulic oil input into each pressure regulating chamber 3 so as to correct the local output pressure of the pressure rod 6 according to the pressure rule of the die casting die 8; the hydraulic output end of the hydraulic unit is connected to the inner wall of the scheduling disk 10 and the oil injection port 4 through a control oil circuit respectively, and the control oil circuit is used to control the hydraulic unit to input hydraulic oil into the scheduling disk 10 or the oil injection port 4 to drive the pressure rod 6 to move in the injection chamber 9 of the die casting die 8.

[0040] In the above, multiple pressure regulating chambers 3 are designed to divide the input pressure of the hydraulic unit to correct the local output pressure of the pressurizing rod 6 according to the pressurization rules of the die-casting die 8, effectively adjust the pressurization speed, and avoid shrinkage caused by too fast or too slow pressurization during the die-casting process. Specifically, when the local pressure requirement of the die-casting die 8 increases, the proportional regulating valve 12 is used to reduce the amount of hydraulic oil controlled 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 pressurizing rod 6; similarly, when the local pressure requirement of the die-casting die 8 decreases, the proportional regulating valve 12 is used to increase the amount of hydraulic oil controlled 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 pressurizing rod 6. Among them, if the local pressure adjustment range of the die-casting die 8 is small, the hydraulic oil output flow of the pressurizing pipe 11 can be accurately controlled by adjusting the opening and closing size of the proportional regulating valve 12, thereby adjusting the output pressure of the pressurizing rod 6. It should be noted that the pressure inside the pressure regulating chamber 3 that controls the hydraulic oil remains the same, that is, the opening and closing degrees of the proportional control valve 12 are the same.

[0041] Furthermore, the pressurizing unit also includes a control module 13, which is respectively connected to the proportional control 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 die 8 to control the hydraulic unit to input hydraulic oil into the scheduling disk 10 through the control oil circuit, and controls the opening and closing degrees of multiple proportional control valves 12 to adjust the hydraulic oil flow 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 die 8, thereby driving the pressurizing rod 6 to extend into the injection chamber 9 of the die-casting die 8 at a pressurizing speed corresponding to the pressurizing rule of the die-casting die 8 to inject the casting fluid into the die-casting die 8 to realize the die-casting operation; when the die-casting operation is completed inside the die-casting die 8, the control module 13 generates an unloading instruction to control the hydraulic unit to input hydraulic oil into the oil filling port 4 through the control oil circuit to drive the pressurizing rod 6 to withdraw from the injection chamber 9 of the die-casting die 8 to realize the unloading action. Specifically, the control module 13 has a setting subunit 14, an operation processor 15, a clock processor 16 and a controller 17. The setting subunit 14 sets the output pressure change parameters and the pressure stabilization time of the pressurizing rod 6 according to the pressurization rules of the die-casting die 8; the operation processor 15 is connected to the setting subunit 14, the proportional control 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 control valve 12 and the opening and closing degree of each proportional control valve 12 according to the output pressure change parameters of the pressurizing rod 6 to generate a corresponding pressurization instruction; the clock processor 16 is connected to the setting subunit 14 and the operation processor 15 to couple the pressure stabilization time of the pressurizing rod 6 to the pressurization instruction to generate a unloading instruction; the controller 17 is connected to the operation processor 15, the clock processor 16, the proportional control valve 12, the control oil circuit and the hydraulic unit, and is used to send the pressurization instruction and the unloading instruction to the proportional control valve 12, the control oil circuit and the hydraulic unit respectively to control the output pressure of the pressurizing rod 6 according to the pressurization rules of the die-casting die 8.

[0042] In the above, the pressurization rule has: according to the structural changes of the casting, the changes in the wall thickness and size parameters of the casting are obtained to generate the corresponding propulsion stroke and propulsion speed and store them in the memory. The setting subunit 14 obtains the propulsion stroke and propulsion speed of the pressurization rule from the memory to set the output pressure change parameters and the pressure stabilization time of the pressurization rod 6; at the same time, the setting subunit 14 sends the control signal corresponding to the output pressure change parameters of the pressurization rod 6 to the calculation processor 15, so that the calculation processor 15 calculates the pressure difference between the actual oil pressure of the control oil circuit and the output pressure change parameters of the pressurization rod 6, and evenly distributes the pressure difference to the pressure regulating chamber 3 of the hydraulic oil in the scheduling disk 10 that participates in the control of the current scheduling disk 10 to calculate the opening number of the proportional control valve 12 and the opening and closing degree of each proportional control valve 12 to generate the corresponding pressurization instruction, so as to effectively control the output pressure of the pressurization rod 6, so as to regulate the propulsion stroke and propulsion speed of the pressurization rod 6, so as to facilitate the effective pressurization molding of the thick and large sections of the casting during the die casting process. It should be noted that the stabilization time is the residence time of the pressure rod 6 in the injection chamber 9 after pressure molding, so as to ensure better molding of the casting liquid. The stabilization time is set to 2-5s.

[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 mold group 8. The die-casting mold group 8 has a movable mold and a fixed mold. After the movable mold and the fixed mold are combined, an injection cavity is formed between their opposite surfaces. The end of the injection chamber 9 away from the pressure rod 6 is connected to the injection cavity. The outer periphery of the injection chamber 9 has a pouring port connected to the interior thereof, so that casting liquid is injected into the injection chamber 9 through the pouring port and the injection piston 5 is driven by the pressure unit to inject the casting liquid into the injection cavity for pressurized molding according to the thrust stroke and thrust speed corresponding to the pressurization rule of the die-casting mold group 8.

[0044] Furthermore, the control oil circuit includes an electromagnetic reversing valve 18, a first oil circuit 19, a second oil circuit 21 and an oil pressure sensor 23. The oil inlet of the electromagnetic reversing valve 18 is connected to the oil outlet of the hydraulic unit. The first oil outlet of the electromagnetic reversing valve 18 is installed with a first electronic valve 20, and the second oil outlet of the electromagnetic reversing valve 18 is installed with a second electronic valve 22; 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 filling 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 disk 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; the first electronic valve 20 and the second electronic valve 22 are both three-way reversing 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 return pipe 30.

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

[0046] Furthermore, the hydraulic unit includes an oil tank 24 and a hydraulic pump group 25. The oil tank 24 has an oil storage chamber inside, the top of the oil storage chamber is provided with an oil return port, and 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 pass through the outer periphery of the oil tank 24; the hydraulic pump group 25 is installed on the outer periphery of the oil tank 24, the oil inlet of the hydraulic pump group 25 is connected to the oil supply port through a pipeline, and the oil outlet of the hydraulic pump group 25 is connected to the oil inlet of the electromagnetic reversing valve 18 through a pipeline; the hydraulic pump group 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 group 25 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.

[0047] In the above, a filter is detachably installed in the oil return port to filter impurities in the hydraulic oil returning to the oil tank 24. The filter is replaced and cleaned 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 periphery of the oil tank 24, so that during the pressurization process, a 10-15°C coolant is continuously introduced into the spiral water cooling pipe to cool the hydraulic oil, thereby avoiding excessively high temperature of the hydraulic oil returned to the oil tank 24, which causes the temperature of the oil tank 24 and the entire pressurization unit to rise, which is not conducive to the continuous operation.

[0049] Furthermore, the linear displacement stroke of the pressure regulating chamber 3 is greater than the linear displacement stroke of the hydraulic chamber 2 to ensure that the piston 5 reaches the maximum displacement stroke. The end of the pressurizing tube 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 pressurizing tube 11 is in a closed state, the control module 13 controls the corresponding third electronic valve 27 on one side of the pressurizing tube 11 to be in an open state, thereby ensuring that the inside of the pressure regulating chamber 3 is in a stable pressure state; when the second electronic valve 22 on the pressurizing tube 11 is in an open state to allow hydraulic oil to flow into the inside of the pressure regulating chamber 3, the control module 13 controls the corresponding third electronic valve 27 on one side of the pressurizing tube 11 to be in a closed state. The hydraulic chamber 2 has a second ventilation hole 28 at one end close to the pressurizing chamber, and a fourth electronic valve 29 is installed in the second ventilation 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 inside the hydraulic chamber 2 and on the side close to the pressure regulating chamber 3 when the piston 5 moves, causing a malfunction in the operation of the pressurizing unit.

Claims

1. A local pressure control device for die casting capable of automatic correction, comprising a hydraulic unit and a pressure unit arranged on one side of the injection chamber (9) of the die casting die set (8), characterized in that: The pressurizing unit comprises: A shell (1), wherein the shell (1) has a hydraulic chamber (2) and a plurality of pressure regulating chambers (3) which are interconnected, wherein the plurality of pressure regulating chambers (3) are respectively arranged along the extension direction of the center line of the hydraulic chamber (2), and the outer periphery of the shell (1) has an oil filling port (4), wherein the oil filling port (4) is connected to an end of the hydraulic chamber (2) away from the pressure regulating chamber (3); A piston (5), the piston (5) being slidably arranged along the inner wall of the hydraulic chamber (2), and a first sealing member being arranged between the opposing surfaces of the piston (5) and the inner wall of the hydraulic chamber (2) to achieve dynamic sealing; A pressurizing rod (6), wherein the pressurizing rod (6) is arranged in the hydraulic chamber (2), one end of the pressurizing rod (6) is connected to the end of the piston (5) away from the pressure regulating chamber (3), and the other end of the pressurizing rod (6) penetrates the inner wall of the housing (1) and extends into the injection chamber (9) of the die-casting die set (8) so as to inject the casting fluid injected into the injection chamber (9) into the die-casting die set (8) according to the pressurization rule of the die-casting die set (8); A push rod (7), the push rod (7) being slidably mounted in the pressure regulating chamber (3), one end of the push rod (7) extending out of the pressure regulating chamber (3) and connected to the piston (5), and a second sealing member being arranged between the end of the push rod (7) away from the piston (5) and the opposite surface of the inner wall of the hydraulic chamber (2) to achieve dynamic sealing; A dispatching disk (10) is arranged on the outer periphery of the shell (1) and at one end close to the pressure regulating chamber (3); the interior of the dispatching disk (10) is a hollow structure; the end of the dispatching disk (10) close to the shell (1) has a pressurizing pipe (11) matching the number and position of the pressure regulating chambers (3) so as to connect each of the pressure regulating chambers (3) with the dispatching disk (10) through the pressurizing pipe (11); a proportional regulating valve (12) is arranged in the pressurizing pipe (11) to control the flow of hydraulic oil input into each of the pressure regulating chambers (3) so as to correct the local output pressure of the pressurizing rod (6) according to the pressurizing rule of the die-casting die set (8); The hydraulic output end of the hydraulic unit is connected to the inner wall of the scheduling disk (10) and the oil filling port (4) respectively through a control oil circuit, and the control oil circuit is used to control the hydraulic unit to input hydraulic oil into the scheduling disk (10) or the oil filling port (4) to drive the pressure rod (6) to move in the injection chamber (9) of the die-casting mold assembly (8).

2. The automatically correctable die casting local pressurization control device according to claim 1, characterized in that: The pressurizing unit further comprises a control module (13), wherein the control module (13) is respectively connected to the proportional regulating valve (12), the control oil circuit and the hydraulic unit, wherein the control module (13) generates a pressurizing instruction according to the pressurizing rule of the die-casting die set (8) to control the hydraulic unit to input hydraulic oil into the scheduling disk (10) through the control oil circuit, and controls the opening and closing degrees 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 die set (8), thereby driving the pressurizing rod (6) to extend into the injection chamber (9) of the die-casting die set (8) at a pressurizing speed corresponding to the pressurizing rule of the die-casting die set (8) to inject the casting fluid into the die-casting die set (8) to realize the die-casting operation; When the die-casting operation is completed inside the die-casting die set (8), the control module (13) generates a unloading instruction to control the hydraulic unit to input hydraulic oil into the oil filling port (4) through the control oil circuit to drive the pressure rod (6) to withdraw from the injection chamber (9) of the die-casting die set (8) to achieve the unloading action.

3. The automatically correctable die casting local pressurization control device according to claim 2, characterized in that: The control module (13) comprises: A setting subunit (14) is used to set the output pressure variation parameters and the pressure stabilization time of the pressure rod (6) according to the pressure rule of the die-casting die set (8); an operation processor (15), connected to the setting subunit (14), the proportional control 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 control valve (12) and the opening and closing degree of each proportional control valve (12) according to the output pressure change parameter of the pressurizing rod (6) to generate a corresponding pressurizing instruction; A clock processor (16) is connected to the setting subunit (14) and the operation processor (15) to couple the pressure stabilization time of the pressurizing rod (6) to the pressurizing instruction to generate a load unloading instruction; A controller (17) is connected to the operation processor (15), the clock processor (16), the proportional control valve (12), the control oil circuit and the hydraulic unit, and is used to send the pressurization instruction and the unloading instruction to the proportional control valve (12), the control oil circuit and the hydraulic unit respectively.

4. The automatically correctable die casting local pressurization control device according to claim 2, characterized in that: The control oil circuit comprises: an electromagnetic reversing valve (18), wherein an oil inlet of the electromagnetic reversing valve (18) is connected to an oil outlet of the hydraulic unit, a first electronic valve (20) is installed at a first oil outlet of the electromagnetic reversing valve (18), and a second electronic valve (22) is installed at a second oil outlet of the electromagnetic reversing 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 filling port (4); a second oil circuit (21), one end of the second oil circuit (21) being connected to the second electronic valve (22), and the other end of the second oil circuit (21) being connected to the scheduling disk (10); an oil pressure sensor (23), the oil pressure sensor (23) being installed on the second oil circuit (21), the oil pressure sensor (23) being connected to the control module (13), and the oil pressure sensor (23) being used to collect the actual oil pressure of the second oil circuit (21) and upload the actual oil pressure to the control module (13); The first electronic valve (20) and the second electronic valve (22) are both three-way reversing 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 an oil return pipe (30).

5. The automatically correctable die casting local pressurization control device according to claim 4, characterized in that: The hydraulic unit comprises: An oil tank (24), wherein the oil tank (24) has an oil storage chamber inside, 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 circumference of the oil tank (24); a hydraulic pump group (25), the hydraulic pump group (25) being mounted on the outer periphery of the oil tank (24), the oil inlet of the hydraulic pump group (25) being connected to the oil supply port via a pipeline, and the oil outlet of the hydraulic pump group (25) being connected to the oil inlet of the electromagnetic reversing valve (18) via a pipeline; The hydraulic pump group (25) has a control unit connected to the oil pressure sensor (23), and the control unit adjusts the output oil pressure of the hydraulic pump group (25) 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.

6. The automatically correctable die casting local pressurization control device 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 automatically correctable die casting local pressurization control device according to claim 2, characterized in that: The pressurizing tube (11) has a first ventilation hole (26) at one end close to the housing (1), a third electronic valve (27) is installed in the first ventilation hole (26), and the third electronic valve (27) is connected to the control module (13).

8. The automatically correctable die casting local pressurization control device according to claim 2, characterized in that: The hydraulic chamber (2) has a second ventilation hole (28) at one end close to the pressurizing chamber, a fourth electronic valve (29) is installed in the second ventilation hole (28), and the fourth electronic valve (29) is connected to the control module (13).

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