Two-platen machine clamping system and two-platen machine control method

Abstract

The present invention belongs to the field of injection molding technology and discloses a two-platen mold locking system and a two-platen control method. In this two-platen mold locking system, a first reversing control valve can selectively connect the mold locking cavity with the output end of the oil pump assembly and the mold breaking cavity with the oil tank; or connect the mold locking cavity with the oil tank and the mold breaking cavity with the output end of the oil pump assembly. Alternatively, the mold locking cavity can be sealed and the mold breaking cavity can be connected with the oil tank. The input end of the proportional relief valve is connected to the input end of the first on-off valve, and both the input end of the proportional relief valve and the input end of the first on-off valve are connected to the mold locking cavity. The output ends of multiple first on-off valves are all connected. The output ends of multiple first on-off valves are all connected to the input end of the second on-off valve. The first on-off valve can selectively open and close the mold locking cavity and the second on-off valve. This can effectively improve the quality stability of the final product and effectively enhance the versatility of the two-platen mold locking system.

Description

Technical Field

[0001] The present invention relates to the field of injection molding technology, and in particular to a two-platen machine clamping system and a two-platen machine control method. Background Art

[0002] A two-platen machine typically consists of a mold, a plasticizing and injection system, and a clamping system. The plasticizing and injection system heats and plasticizes a certain amount of material within a specified timeframe, then injects the molten material into the mold cavity via a screw at a specific pressure and speed. After injection, the mold maintains the shape of the molten material injected into the cavity. The clamping system ensures mold closure, opening, and ejection of the finished product. After mold closure, it applies sufficient clamping force to counteract the cavity pressure generated by the molten material entering the cavity, preventing cracks in the mold and affecting product quality.

[0003] For mold clamping systems, existing technologies typically employ multiple first electromagnetic reversing valves, each corresponding to a plurality of clamping cylinders. These first electromagnetic reversing valves control the on / off switching of the oil pump and the corresponding clamping cylinder, allowing hydraulic oil to be delivered to the clamping cavity of each clamping cylinder for mold clamping. Furthermore, one or more second electromagnetic reversing valves control the on / off switching of the clamping cylinder's mold-breaking cavity and the oil tank, allowing the hydraulic oil in each mold-breaking cavity to flow back into the oil tank. While this system achieves both mold clamping and demolding, it cannot guarantee consistent clamping force across the multiple clamping cylinders, resulting in unstable product quality. Furthermore, it is also impossible to adjust the clamping force provided by the multiple clamping cylinders to meet specific requirements, resulting in poor versatility. Summary of the Invention

[0004] The purpose of the present invention is to provide a two-platen clamping system and a two-platen control method, which can effectively improve the quality stability of the final product and effectively improve the versatility of the two-platen clamping system.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The two-platen clamping system includes an oil tank, an oil pump assembly, and a plurality of parallel-distributed clamping assemblies; the input end of the oil pump assembly is connected to the oil tank; the clamping assembly includes a clamping cylinder, which includes a cylinder body and a piston rod slidably disposed on the cylinder body, the piston rod dividing the cylinder body into a clamping cavity and a demolding cavity; the piston rod is connected to the movable platen and can drive the movable platen to move; the clamping assembly also includes:

[0007] a first reversing control valve, the first reversing control valve being capable of selectively connecting the mold locking cavity with the output end of the oil pump assembly and connecting the mold breaking cavity with the oil tank; or connecting the mold locking cavity with the oil tank and connecting the mold breaking cavity with the output end of the oil pump assembly; or sealing the mold locking cavity and connecting the mold breaking cavity with the oil tank;

[0008] A proportional relief valve and a first on-off valve, wherein the input end of the proportional relief valve is connected to the input end of the first on-off valve, and the input end of the proportional relief valve and the input end of the first on-off valve are both connected to the clamping cavity; the output ends of the plurality of first on-off valves are all connected;

[0009] The two-platen clamping system further includes a second on-off valve, and the output ends of the plurality of first on-off valves are all connected to the input end of the second on-off valve; the first on-off valve can selectively open and close the clamping cavity and the second on-off valve.

[0010] As a preferred solution of the above-mentioned two-platen clamping system, the first reversing control valve is a three-position four-way solenoid reversing valve, the oil inlet P1 of the first reversing control valve is connected to the output end of the oil pump assembly, the communication port A1 of the first reversing control valve is connected to the clamping cavity, the communication port B1 of the first reversing control valve is connected to the mold breaking cavity, and the oil return port T1 of the first reversing control valve is connected to the oil tank;

[0011] When the left position of the first reversing control valve is energized, the oil inlet P1 is connected to the connecting port B1, and the connecting port A1 is connected to the oil return port T1; when the right position of the first reversing control valve is energized, the oil inlet P1 is connected to the connecting port A1, and the connecting port B1 is connected to the oil return port T1; when the first reversing control valve is de-energized, the oil inlet P1 and the connecting port A1 are both blocked, and the connecting port B1 is connected to the oil return port T1.

[0012] As a preferred solution of the above-mentioned two-platen clamping system, the clamping assembly also includes a hydraulically controlled one-way valve, which is arranged on the pipeline connecting the connecting port A1 and the clamping cavity, and the pilot oil port of the hydraulically controlled one-way valve is connected to the pipeline connecting the connecting port B1 and the demolding cavity.

[0013] As a preferred solution of the above-mentioned two-platen clamping system, the two-platen clamping system further includes an energy recovery component, and the energy recovery component includes:

[0014] An energy recovery bottle, wherein the output ends of the plurality of proportional relief valves are all connected to the input end of the energy recovery bottle;

[0015] The second reversing control valve, the second on-off valve can selectively open and close the second reversing control valve and multiple first on-off valves; the second reversing control valve can selectively connect the second on-off valve with the oil tank, or connect the second on-off valve with the energy recovery bottle.

[0016] As a preferred solution of the above-mentioned two-platen clamping system, a first mechanical one-way valve is provided on the pipeline connecting the second reversing control valve and the energy recovery bottle, and the first mechanical one-way valve can guide the hydraulic oil from the second reversing control valve to the energy recovery bottle.

[0017] As a preferred solution of the above-mentioned two-platen clamping system, the energy recovery component also includes a third on-off valve, which can selectively open and close the energy recovery bottle and the input end of the first reversing control valve; when the energy recovery bottle and the input end of the first reversing control valve are connected, the third on-off valve can make the hydraulic oil flowing out of the energy recovery bottle flow unidirectionally to the input end of the first reversing control valve.

[0018] As a preferred solution of the above-mentioned two-platen clamping system, the two-platen clamping system further includes an exhaust valve and a second mechanical one-way valve, and the clamping cavity, the exhaust valve, the second mechanical one-way valve and the oil tank are connected in sequence.

[0019] A two-platen machine control method is used to be implemented in the above-mentioned two-platen machine clamping system, and the two-platen machine control method includes:

[0020] When the clamping forces of the multiple clamping cylinders need to be adjusted to be the same, the first reversing control valve is controlled to connect the clamping cavity with the output end of the oil pump assembly, and the mold breaking cavity with the oil tank; at the same time, the overload pressures of the multiple proportional relief valves are controlled to be the same; at the same time, the multiple first on-off valves are controlled to connect the corresponding clamping cavities with the second on-off valves; at the same time, the second on-off valves are controlled to be in the disconnected state; and then the oil pump assembly is controlled to supply oil to the clamping cavity.

[0021] As a preferred solution of the above two-platen control method, the two-platen control method further includes:

[0022] When the clamping forces of the multiple clamping cylinders need to be adjusted to be at least partially different, the first reversing control valve is controlled to connect the clamping cavity with the output end of the oil pump assembly, and the mold breaking cavity with the oil tank; at the same time, the overload pressures of the multiple proportional relief valves are controlled to be at least partially different; at the same time, the multiple first on-off valves are controlled to disconnect the corresponding clamping cavity from the second on-off valve; and then the oil pump assembly is controlled to supply oil to the clamping cavity.

[0023] As a preferred solution of the above-mentioned two-platen machine control method, the two-platen machine clamping system further includes an energy recovery bottle and a second reversing control valve; the second on-off valve can selectively open and close the second reversing control valve and multiple first on-off valves; the second reversing control valve can selectively connect the second on-off valve to the oil tank, or connect the second on-off valve to the energy recovery bottle; the two-platen machine control method further includes:

[0024] When the clamping cavity is draining oil, the second reversing control valve is controlled to connect the second on-off valve with the energy recovery bottle; the second on-off valve is controlled to connect the second reversing control valve with multiple first on-off valves; and the multiple first on-off valves are controlled to connect the corresponding clamping cavity with the second on-off valve.

[0025] When the chamber pressure of the clamping cavity is less than or equal to the bottle mouth pressure of the energy recovery bottle, the second reversing control valve is controlled to connect the second on-off valve with the oil tank.

[0026] Beneficial effects of the present invention:

[0027] The present invention provides a two-platen mold clamping system and a two-platen mold clamping control method. The two-platen mold clamping system includes an oil tank, an oil pump assembly, and multiple parallel-connected mold clamping assemblies. The oil pump assembly's input is connected to the oil tank. The mold clamping assembly includes a mold clamping cylinder, which includes a cylinder body and a piston rod slidably mounted therein. The piston rod divides the cylinder body into a mold clamping chamber and a mold breaking chamber. The piston rod is connected to a movable platen and can drive the movable platen to move. The mold clamping assembly also includes a first reversing control valve, a proportional relief valve, and a first on-off valve. The first reversing control valve can selectively connect the mold clamping chamber to the output of the oil pump assembly and the mold breaking chamber to the oil tank; connect the mold clamping chamber to the oil tank and the mold breaking chamber to the output of the oil pump assembly; or seal the mold clamping chamber and connect the mold breaking chamber to the oil tank. The input of the proportional relief valve is connected to the input of the first on-off valve, and both the input of the proportional relief valve and the input of the first on-off valve are connected to the mold clamping chamber. The output ends of the plurality of first on-off valves are all connected. The two-platen mold clamping system also includes a second on-off valve. The output ends of the plurality of first on-off valves are all connected to the input end of the second on-off valve. The first on-off valve can selectively open and close the mold clamping cavity and the second on-off valve.

[0028] To adjust the clamping force of multiple clamping cylinders to the same value, the first reversing control valve is controlled to connect the clamping cavity with the output of the pump assembly and the mold-breaking cavity with the oil tank. The pump assembly then supplies oil to the clamping cavity, pushing the movable platen to move and close with the fixed platen to form the mold cavity. Simultaneously, the multiple first on-off valves are controlled to connect their corresponding clamping cavities with the second on-off valves, and the second on-off valves are controlled to be in the off state, connecting the multiple clamping cavities in series. Simultaneously, the overload pressures of the multiple proportional relief valves are controlled to be the same. As hydraulic oil is injected into each clamping cavity, the final clamping force of the multiple clamping cavities can be adjusted to be consistent. This effectively improves the quality and stability of the final product.

[0029] When the clamping forces of multiple clamping cylinders need to be adjusted to at least partially differ, the first reversing control valve is controlled to connect the clamping cavity with the oil pump assembly and the mold-breaking cavity with the oil tank. The oil pump assembly then pumps oil into the clamping cavity, pushing the movable platen to move and close with the fixed platen to form a mold cavity. Simultaneously, the multiple first on-off valves are controlled to disconnect the corresponding clamping cavities from the second on-off valves, rendering the multiple clamping cavities independent and non-interfering. Furthermore, the overload pressures of the multiple proportional relief valves are controlled to at least partially differ. As hydraulic oil is injected into each clamping cavity, the final clamping forces of the multiple clamping cavities can be adjusted to at least partially differ. This effectively improves the versatility of the two-platen clamping system.

[0030] When the clamping forces of the multiple clamping cylinders have been adjusted to the desired values, the first reversing control valve is controlled to close the clamping cavity and connect the mold-breaking cavity to the oil tank. This allows the clamping forces of the various clamping cylinders to remain constant, and the hydraulic oil in the mold-breaking cavity to flow back into the oil tank.

[0031] When the movable template needs to be adjusted away from the fixed template, that is, when the mold is to be demolded, the first reversing control valve is controlled to connect the locking cavity with the oil tank, and the mold breaking cavity with the output end of the oil pump assembly. The oil pump assembly pumps oil into the mold breaking cavity to push the movable template to move away from the fixed template, so that the product can be demolded.

[0032] Therefore, by adopting the two-platen mold locking system, the quality stability of the final product can be effectively improved, and the versatility of the two-platen mold locking system can be effectively improved.

[0033] The present invention also provides a two-platen control method for use in the aforementioned two-platen mold-locking system. By employing this two-platen control method to control the aforementioned two-platen mold-locking system, the quality stability of the resulting product can be effectively improved, and the versatility of the two-platen mold-locking system can be effectively enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of a two-platen clamping system provided by a specific embodiment of the present invention;

[0035] Figure 2 This is a partial schematic diagram of the oil pump assembly and oil tank of the two-platen clamping system provided by a specific embodiment of the present invention;

[0036] Figure 3 This is the process of the two-platen control method provided by the specific embodiment of the present invention Figure 1 ;

[0037] Figure 4 This is the process of the two-platen control method provided by the specific embodiment of the present invention Figure 2 .

[0038] In the picture:

[0039] 1. Fuel tank;

[0040] 2. Oil pump assembly; 21. Oil pump; 22. Pilot check valve; 231. Pilot cartridge valve; 232. Relief valve body; 24. Filter; 25. Second throttle valve; 26. Third throttle valve; 27. Third pressure sensor; 28. Second pressure gauge;

[0041] 3. Clamping assembly; 31. Clamping cylinder; 311. Piston rod; 312. Clamping cavity; 313. Mold breaking cavity; 32. First reversing control valve; 33. Proportional relief valve; 34. First on-off valve; 35. Hydraulic-controlled check valve; 36. Exhaust valve; 37. Second mechanical check valve; 38. Second pressure sensor; 39. Electronic ruler;

[0042] 41. Energy recovery bottle; 42. Second reversing control valve; 43. First mechanical one-way valve; 44. Third on-off valve; 45. First throttle valve; 46. First pressure sensor; 47. First pressure gauge;

[0043] 5. Second on-off valve. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0045] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0046] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0048] For mold clamping systems, existing technologies typically employ multiple first electromagnetic reversing valves, each corresponding to a plurality of clamping cylinders. These first electromagnetic reversing valves control the on / off switching of the oil pump and the corresponding clamping cylinder, allowing hydraulic oil to be delivered to the clamping cavity of each clamping cylinder for mold clamping. Furthermore, one or more second electromagnetic reversing valves control the on / off switching of the clamping cylinder's mold-breaking cavity and the oil tank, allowing the hydraulic oil in each mold-breaking cavity to flow back into the oil tank. While this system achieves both mold clamping and demolding, it cannot guarantee consistent clamping force across the multiple clamping cylinders, resulting in unstable product quality. Furthermore, it is also impossible to adjust the clamping force provided by the multiple clamping cylinders to meet specific requirements, resulting in poor versatility.

[0049] Figure 1 This is the schematic diagram of the two-platen clamping system. Figure 2 This is a partial schematic diagram of the oil pump assembly and oil tank of the two-platen clamping system. Figure 3 This is the process of the two-plate control method Figure 1 . Figure 4 This is the process of the two-plate control method Figure 2 .

[0050] like Figure 1As shown, the present invention provides a two-platen mold clamping system comprising an oil tank 1, an oil pump assembly 2, and multiple parallel-connected mold clamping assemblies 3. The input end of the oil pump assembly 2 is connected to the oil tank 1. The mold clamping assembly 3 includes a mold clamping cylinder 31, which comprises a cylinder body and a piston rod 311 slidably mounted therein. The piston rod 311 divides the cylinder body into a mold clamping cavity 312 and a mold release cavity 313. The piston rod 311 is connected to the movable platen and can drive the movable platen to move. The mold clamping assembly 3 also includes a first reversing control valve 32, a proportional relief valve 33, and a first on-off valve 34. The first reversing control valve 32 can selectively connect the mold clamping cavity 312 to the output of the oil pump assembly 2 and the mold release cavity 313 to the oil tank 1; or connect the mold clamping cavity 312 to the oil tank 1 and the mold release cavity 313 to the output of the oil pump assembly 2; or seal the mold clamping cavity 312 and connect the mold release cavity 313 to the oil tank 1. The input of the proportional relief valve 33 is connected to the input of the first on-off valve 34, and both the input of the proportional relief valve 33 and the input of the first on-off valve 34 are connected to the mold clamping cavity 312. The outputs of the multiple first on-off valves 34 are all connected. The two-platen mold clamping system also includes a second on-off valve 5. The outputs of the multiple first on-off valves 34 are all connected to the input of the second on-off valve 5. The first on-off valve 34 can selectively open and close the mold clamping cavity 312 and the second on-off valve 5.

[0051] When the clamping forces of multiple clamping cylinders 31 are adjusted to be the same, the first reversing control valve 32 is controlled to connect the clamping cavity 312 with the output of the oil pump assembly 2, and the mold-breaking cavity 313 is connected to the oil tank 1. The oil pump assembly 2 supplies oil to the clamping cavity 312 to move the movable mold plate and close it with the fixed mold plate to form a mold cavity. Simultaneously, the multiple first on-off valves 34 are controlled to connect the corresponding clamping cavity 312 with the second on-off valve 5, and the second on-off valve 5 is controlled to be in the off state, so that the multiple clamping cavities 312 are connected in series. At the same time, the overload pressures of the multiple proportional relief valves 33 are controlled to be the same. As hydraulic oil is injected into each clamping cavity 312, the final clamping force of the multiple clamping cavities 312 can be adjusted to be consistent. This effectively improves the quality and stability of the final product.

[0052] When the clamping forces of multiple clamping cylinders 31 need to be adjusted to at least partially differ, the first reversing control valve 32 is controlled to connect the clamping cavity 312 with the oil pump assembly 2, and the mold-breaking cavity 313 with the oil tank 1. The oil pump assembly 2 pumps oil into the clamping cavity 312 to move the movable mold plate and close it with the fixed mold plate to form a mold cavity. At the same time, the multiple first on-off valves 34 are controlled to disconnect the corresponding clamping cavity 312 from the second on-off valve 5, making the multiple clamping cavities 312 independent of each other and non-interfering. At the same time, the overload pressures of the multiple proportional relief valves 33 are controlled to at least partially differ. As hydraulic oil is injected into each clamping cavity 312, the final clamping forces of the multiple clamping cavities 312 can be adjusted to at least partially differ. This effectively improves the versatility of the two-platen clamping system.

[0053] When the clamping forces of the multiple clamping cylinders 31 have all reached the desired values, the first reversing control valve 32 is controlled to close the clamping cavity 312 and connect the mold-breaking cavity 313 to the oil tank 1. This ensures that the clamping forces of the various clamping cylinders 31 remain constant, and the hydraulic oil in the mold-breaking cavity 313 can flow back into the oil tank 1.

[0054] When the movable template needs to be adjusted away from the fixed template, that is, when the mold is to be demolded, the first reversing control valve 32 is controlled to connect the locking cavity 312 with the oil tank 1, and the demolding cavity 313 with the output end of the oil pumping assembly 2. The oil pumping assembly 2 pumps oil into the demolding cavity 313 to push the movable template to move away from the fixed template, so that the product can be demolded.

[0055] Therefore, by adopting the two-platen mold locking system, the quality stability of the final product can be effectively improved, and the versatility of the two-platen mold locking system can be effectively improved.

[0056] Specifically, in this embodiment, Figure 1 As shown, the exemplary number of the clamping assemblies 3 is four. It is understandable that the number of the clamping assemblies 3 can also be adaptively increased or decreased according to actual working conditions.

[0057] Specifically, in this embodiment, Figure 1As shown, the first reversing control valve 32 is a three-position, four-way solenoid reversing valve. Its oil inlet P1 is connected to the output of the oil pump assembly 2, its communication port A1 is connected to the mold clamping cavity 312, its communication port B1 is connected to the mold breaking cavity 313, and its oil return port T1 is connected to the oil tank 1. When the left station of the first reversing control valve 32 is energized, the oil inlet P1 is connected to the communication port B1, and the communication port A1 is connected to the oil return port T1. When the right station of the first reversing control valve 32 is energized, the oil inlet P1 is connected to the communication port A1, and the communication port B1 is connected to the oil return port T1. When the first reversing control valve 32 is de-energized, both the oil inlet P1 and the communication port A1 are blocked, and the communication port B1 is connected to the oil return port T1. Specifically, when the left position of the first reversing control valve 32 is energized, the mold clamping cavity 312 communicates with the oil tank 1, and the mold breaking cavity 313 communicates with the output end of the oil pump assembly 2. When the right position of the first reversing control valve 32 is energized, the mold clamping cavity 312 communicates with the output end of the oil pump assembly 2, and the mold breaking cavity 313 communicates with the oil tank 1. When the first reversing control valve 32 is de-energized, the mold clamping cavity 312 is sealed, and the mold breaking cavity 313 communicates with the oil tank 1.

[0058] Specifically, in this embodiment, when the first on-off valve 34 is energized, it is in the disconnected state. The first on-off valve 34 disconnects the mold-breaking cavity 313 from the second on-off valve 5. When the first on-off valve 34 is de-energized, it is in the connected state. The first on-off valve 34 connects the mold-breaking cavity 313 to the second on-off valve 5.

[0059] Preferably, if Figure 1 As shown, the mold clamping assembly 3 further includes a hydraulically controlled one-way valve 35, which is disposed on the pipeline connecting the connection port A1 and the mold clamping cavity 312. The pilot oil port of the hydraulically controlled one-way valve 35 is connected to the pipeline connecting the connection port B1 and the mold release cavity 313. With this arrangement, when the clamping forces of the multiple clamping cylinders 31 reach the desired value, the first reversing control valve 32 is de-energized to seal the mold clamping cavity 312 and connect the mold release cavity 313 to the oil tank 1. The hydraulically controlled one-way valve 35 can further ensure that the clamping force of the mold clamping cavity 312 remains unchanged, thereby further improving the quality and stability of the resulting product. When demolding is to be performed, the left station of the first reversing control valve 32 is energized, and the oil pumping assembly 2 pumps oil into the demolding cavity 313. A portion of the hydraulic oil flowing from the connecting port B1 to the demolding cavity 313 flows from the pilot oil port to the hydraulically controlled one-way valve 35, so that the hydraulically controlled one-way valve 35 connects the clamping cavity 312 and the connecting port A1, so that the hydraulic oil in the clamping cavity 312 can flow back to the oil tank 1 normally to achieve demolding.

[0060] Specifically, when adjusting the clamping forces of multiple clamping cylinders 31 to be the same, the output ends of the multiple proportional relief valves 33 can be connected to the oil tank 1, or the output ends of the multiple proportional relief valves 33 can be connected to the energy recovery component. When adjusting the clamping forces of multiple clamping cylinders 31 to be at least partially different, the output ends of the multiple proportional relief valves 33 can be connected to the oil tank 1, or the output ends of the multiple proportional relief valves 33 can be connected to the energy recovery component. When draining oil from the clamping cavity 312, the clamping cavity 312 can be connected to the oil tank 1, or the output ends of the clamping cavity 312 can be connected to the energy recovery component.

[0061] In this embodiment, it is preferred that the output ends of the multiple proportional relief valves 33 be connected to the energy recovery assembly when adjusting the clamping forces of the multiple clamping cylinders 31 to be the same. When adjusting the clamping forces of the multiple clamping cylinders 31 to be at least partially different, the output ends of the multiple proportional relief valves 33 be connected to the energy recovery assembly. When draining the clamping cavity 312, the clamping cavity 312 is connected to the energy recovery assembly.

[0062] Specifically, if Figure 1 As shown, the energy recovery assembly includes an energy recovery bottle 41 and a second reversing control valve 42. The outputs of the multiple proportional relief valves 33 are connected to the input of the energy recovery bottle 41. The second on-off valve 5 selectively opens and closes the second reversing control valve 42 and the multiple first on-off valves 34. The second reversing control valve 42 selectively connects the second on-off valve 5 to the fuel tank 1 or connects the second on-off valve 5 to the energy recovery bottle 41.

[0063] This arrangement allows, during the process of adjusting the clamping forces of the multiple clamping cylinders 31 to be the same, and during the process of adjusting the clamping forces of the multiple clamping cylinders 31 to be at least partially different, the hydraulic oil with a certain pressure flowing out of the proportional relief valve 33 can all flow to the energy recovery bottle 41, allowing the energy recovery bottle 41 to recover energy. Secondly, when the clamping cavity 312 is draining oil, the second reversing control valve 42 is controlled to connect the second on-off valve 5 with the energy recovery bottle 41, the second on-off valve 5 is controlled to connect the second reversing control valve 42 with the multiple first on-off valves 34, and the multiple first on-off valves 34 are controlled to connect the corresponding mold breaking cavity 313 and the second on-off valve 5, so that the hydraulic oil with a certain pressure in each clamping cavity 312 can all flow to the energy recovery bottle 41, allowing the energy recovery bottle 41 to recover energy.

[0064] Specifically, in this embodiment, the second reversing control valve 42 is a two-position, four-way solenoid reversing valve. The oil inlet P2 of the second reversing control valve 42 is connected to the output of the second on-off valve 5. The communication port A2 of the second reversing control valve 42 is blocked, and the communication port B2 of the second reversing control valve 42 is connected to the energy recovery bottle 41. The oil return port T2 of the second reversing control valve 42 is connected to the fuel tank 1. When the second reversing control valve 42 is energized, the oil inlet P2 is connected to the communication port B2, and the communication port A2 is connected to the oil return port T2. When the second reversing control valve 42 is de-energized, the oil inlet P2 is connected to the communication port A2, and the communication port B2 is connected to the oil return port T2. Specifically, when the second reversing control valve 42 is energized, the second reversing control valve 42 connects the second on-off valve 5 to the energy recovery bottle 41. When the second reversing control valve 42 is de-energized, the second reversing control valve 42 connects the second on-off valve 5 to the fuel tank 1.

[0065] Specifically, in this embodiment, when the second on-off valve 5 is energized, it is in the disconnected state. The second on-off valve 5 disconnects the first on-off valve 34 from the second switching control valve 42. When the second on-off valve 5 is de-energized, it is in the connected state. The second on-off valve 5 connects the first on-off valve 34 to the second switching control valve 42.

[0066] This arrangement allows the clamping cavity 312 to drain oil, and the multiple first on-off valves 34 to be de-energized, thereby connecting each clamping cavity 312 to the second on-off valve 5. The second on-off valve 5 is then de-energized, thereby connecting the second on-off valve 5. This allows the clamping cavity 312 to drain oil, and the energy recovery bottle 41 to recover energy, thereby avoiding energy loss caused by the oil drain.

[0067] This arrangement ensures that even if the two-platen clamping system loses power due to a fault, the pressure oil in the clamping cavity 312 and the demolding cavity 313 can flow back into the oil tank 1, thereby improving the safety of the two-platen clamping system.

[0068] Specifically, in this embodiment, Figure 1 As shown, a first throttle valve 45 is provided on the pipeline connecting the oil return port T2 and the oil tank 1. With this arrangement, the hydraulic oil returning from the clamping cavity 312 to the oil tank 1 can be effectively protected from shock caused by pressure relief by the first throttle valve 45, thereby further improving the safety of the two-platen clamping system.

[0069] Furthermore, if Figure 1As shown, the energy recovery assembly also includes a third on-off valve 44, which can selectively connect and disconnect the energy recovery bottle 41 and the input of the first reversing control valve 32. When the energy recovery bottle 41 is connected to the input of the first reversing control valve 32, the third on-off valve 44 allows the hydraulic oil flowing out of the energy recovery bottle 41 to flow unidirectionally to the input of the first reversing control valve 32. Specifically, during the process of adjusting the clamping forces of multiple clamping cylinders 31 to be the same, during the process of adjusting the clamping forces of multiple clamping cylinders 31 to be at least partially different, and during the process of draining oil from the clamping cavity 312, the third on-off valve 44 is controlled to disconnect the energy recovery bottle 41 from the input of the first reversing control valve 32, thereby ensuring that the energy recovery bottle 41 can effectively recover energy and effectively preventing the hydraulic oil from flowing back into the clamping cavity 312 or the mold-breaking cavity 313. Secondly, by providing the third on-off valve 44, when the oil pump assembly 2 is pumping oil, it is determined in real time whether the pumping pressure of the oil pump assembly 2 is less than the pressure at the bottle mouth of the energy recovery bottle 41. If the pumping pressure of the oil pump assembly 2 is less than the pressure at the bottle mouth of the energy recovery bottle 41, the third on-off valve 44 is controlled to connect the energy recovery bottle 41 with the input end of the first reversing control valve 32. If the pumping pressure of the oil pump assembly 2 is greater than or equal to the pressure at the bottle mouth of the energy recovery bottle 41, the third on-off valve 44 is controlled to disconnect the energy recovery bottle 41 from the input end of the first reversing control valve 32. This allows the energy collected by the energy recovery bottle 41 to replenish the pumping oil, thereby efficiently and stably delivering hydraulic oil to the clamping cylinder 31.

[0070] Specifically, in this embodiment, the energy recovery bottle 41 is exemplarily set as a nitrogen bottle. The nitrogen bottle has a nitrogen chamber and an oil chamber separated. When hydraulic oil with a certain pressure is transported into the oil chamber, the hydraulic oil squeezes the nitrogen in the nitrogen chamber. Therefore, when the hydraulic oil in the energy recovery bottle 41 is transported outward, the reaction force exerted by the squeezed nitrogen on the hydraulic oil gives the hydraulic oil a certain impact force. This enables energy recovery and oil replenishment. The specific structure of the nitrogen bottle belongs to the existing technology and will not be repeated here.

[0071] Specifically, in this embodiment, when the third on-off valve 44 is energized, it is in an off state. The third on-off valve 44 disconnects the energy recovery bottle 41 from the input end of the first reversing control valve 32. When the third on-off valve 44 is de-energized, it is in a one-way communication state. The third on-off valve 44 connects the energy recovery bottle 41 to the input end of the first reversing control valve 32 in a one-way manner.

[0072] Preferably, if Figure 1As shown, a first mechanical check valve 43 is installed on the pipeline connecting the second reversing control valve 42 and the energy recovery bottle 41. The first mechanical check valve 43 can guide the hydraulic oil from the second reversing control valve 42 to the energy recovery bottle 41. In other words, the first mechanical check valve 43 is installed on the pipeline connecting the communication port B2 and the energy recovery bottle 41 to prevent the hydraulic oil from being sucked back into the clamping cavity 312.

[0073] Furthermore, in this embodiment, Figure 1 As shown, the first mechanical one-way valve 43 can also guide the hydraulic oil from the second reversing control valve 42 to the third on-off valve 44. This allows the energy recovery bottle 41 to stably and reliably deliver hydraulic oil to the first reversing control valve 32 through the third on-off valve 44 based on the pumping pressure of the oil pump assembly 2 when the oil is being pumped.

[0074] Alternatively, as Figure 1 As shown, a first pressure sensor 46 is provided at the mouth of the energy recovery bottle 41 to facilitate real-time monitoring of the mouth pressure of the energy recovery bottle 41. Optionally, a first pressure gauge 47 is also provided at the mouth of the energy recovery bottle 41 to monitor the mouth pressure of the energy recovery bottle 41. It will be appreciated that the first pressure sensor 46 and the first pressure gauge 47 form a redundant arrangement to enhance reliability.

[0075] Specifically, if Figure 1 As shown, the mold clamping assembly 3 further includes a second pressure sensor 38. A second pressure sensor 38 is provided at the inlet and outlet of each mold clamping cavity 312 to facilitate real-time monitoring of the clamping force of each mold clamping cavity 312.

[0076] Among them, such as Figure 1 As shown, the two-platen clamping system also includes an exhaust valve 36 and a second mechanical check valve 37. The clamping cavity 312, the exhaust valve 36, the second mechanical check valve 37, and the oil tank 1 are sequentially connected. This arrangement allows for exhaust from the clamping cavity 312 and prevents external air and / or debris from entering the cavity 312, thereby effectively extending the service life of the clamping cylinder 31. The specific structure of the exhaust valve 36 is conventional and will not be further described here.

[0077] Among them, such as Figure 1 As shown, the mold clamping assembly 3 also includes an electronic ruler 39, which is used to monitor the real-time position of a fixed point on the piston rod 311. This facilitates determining the direction of piston movement and the change in distance. This facilitates determining whether the movable platen has moved away from the fixed platen to the desired position during demolding. In this embodiment, the desired position is the initial position of the movable platen. The specific structure of the electronic ruler 39 is prior art and will not be further described here.

[0078] Among them, such as Figure 2As shown, the oil pump assembly 2 includes an oil pump 21, a pilot check valve 22, and a pilot relief valve. The oil tank 1, oil pump 21, the input end of the pilot check valve 22, the output end of the pilot check valve 22, and the oil inlet P1 are sequentially connected. The pilot relief valve includes a pilot cartridge valve 231 and a relief valve body 232. The first oil inlet and outlet of the pilot cartridge valve 231 and the first pilot oil port of the pilot check valve 22 are both connected to the pipeline connecting the output end of the pilot check valve 22 and the oil inlet P1. The second pilot oil port of the pilot cartridge valve 231 and the input end of the relief valve body 232 are both connected to the pipeline connecting the oil pump 21 and the input end of the pilot check valve 22. The second oil inlet and outlet of the pilot cartridge valve 231 and the output end of the relief valve body 232 are both connected to the oil tank 1.

[0079] Specifically, when the oil pump 21 is pumping oil, if the pumping oil pressure is less than or equal to the safety pressure, the hydraulic oil will flow through the input end and the output end of the pilot check valve 22 in sequence and flow to the oil inlet P1. If the pumping oil pressure is greater than the safety pressure, the hydraulic oil exceeding the safety pressure will flow back to the oil tank 1 through the second oil inlet and outlet and the relief valve body 232. This ensures the safety and stability of the oil supply of the two-platen clamping system. Specifically, the pilot check valve 22 can prevent the pumped hydraulic oil from being sucked back and damaging or even destroying the oil pump 21. When the pumping oil pressure is less than or equal to the safety pressure, the hydraulic oil will flow through the input end and the output end of the pilot check valve 22 in sequence and flow to the oil inlet P1, which can effectively reduce the pressure loss of the hydraulic oil delivered to the oil inlet P1.

[0080] Specifically, each time the two-platen clamping system switches, the oil pump 21 is stopped and reversed, so that the hydraulic oil in the pipeline between the oil pump 21 and the input end of the pilot check valve 22 is discharged back to the oil tank 1. This avoids shock when starting the next action.

[0081] Alternatively, as Figure 2 As shown, the oil pump assembly 2 also includes a filter 24, which is used to filter debris and other debris from the hydraulic oil. It is understood that the number of filters 24 can be increased or their placement adjusted based on actual operating conditions. In this embodiment, a single filter 24 is provided, located in the pipeline connecting the oil pump 21 and the oil tank 1.

[0082] Alternatively, as Figure 2As shown, a second throttle valve 25 is provided on the pipeline connecting the first pilot oil port, which is connected to the output end of the pilot check valve 22, and the oil inlet P1. Optionally, at least one third throttle valve 26 is provided on the pipeline connecting the second pilot oil port, which is connected to the oil pump 21, and the input end of the pilot check valve 22. In this embodiment, two third throttle valves 26 are provided as an example. The provision of the second throttle valve 25 and the third throttle valve 26 can effectively further reduce the pressure loss of the hydraulic oil delivered to the oil inlet P1.

[0083] Alternatively, as Figure 2 As shown, the oil pump assembly 2 also includes a third pressure sensor 27 provided at the output end of the oil pump 21, and the third pressure sensor 27 is used to monitor the oil pumping pressure of the oil pump 21. This is convenient for determining whether to start the energy recovery bottle 41 based on the oil pumping pressure of the oil pump 21. Optionally, the oil pump assembly 2 also includes a second pressure gauge 28 provided at the output end of the oil pump 21, and the second pressure gauge 28 is used to monitor the oil pumping pressure of the oil pump 21. This is also convenient for determining whether to start the energy recovery bottle 41 based on the oil pumping pressure of the oil pump 21. It can be understood that the third pressure sensor 27 and the second pressure gauge 28 form a redundant setting to improve reliability.

[0084] The present invention also provides a two-platen control method for use in the aforementioned two-platen mold clamping system. By employing this two-platen control method to control the aforementioned two-platen mold clamping system, the quality stability of the resulting product can be effectively improved, the versatility of the two-platen mold clamping system can be effectively enhanced, the product manufacturing cycle can be effectively shortened to improve injection molding efficiency, energy consumption can be effectively reduced, and the service life of the two-platen mold clamping system can be effectively extended.

[0085] Specifically, the two-trigger control method includes:

[0086] To adjust the clamping forces of multiple clamping cylinders 31 to the same value, the first reversing control valve 32 is controlled to connect the clamping cavity 312 with the output of the oil pump assembly 2 and the mold release cavity 313 with the oil tank 1. Simultaneously, the overload pressures of the multiple proportional relief valves 33 are controlled to be the same. Simultaneously, the multiple first on-off valves 34 are controlled to connect the corresponding clamping cavity 312 with the second on-off valve 5. The second on-off valve 5 is also controlled to be in the off state. The oil pump assembly 2 is then controlled to supply oil to the clamping cavity 312.

[0087] Specifically, the right position of the first reversing control valve 32 is energized. Simultaneously, the overload pressures of the multiple proportional relief valves 33 are maintained at the same level. The multiple first on-off valves 34 are de-energized. Furthermore, the second on-off valve 5 is energized. The oil pump assembly 2 is then controlled to supply oil to the clamping cavity 312. As hydraulic oil is injected into each clamping cavity 312, the final clamping force of the multiple clamping cavities 312 can be adjusted to maintain consistency. This effectively improves the quality and stability of the final product.

[0088] The two-trigger control method further includes:

[0089] To adjust the clamping forces of the multiple clamping cylinders 31 to at least partially differ, the first reversing control valve 32 is controlled to connect the clamping cavity 312 with the output of the oil pump assembly 2 and the mold release cavity 313 with the oil tank 1. Simultaneously, the overload pressures of the multiple proportional relief valves 33 are controlled to at least partially differ. Simultaneously, the multiple first on-off valves 34 are controlled to disconnect the corresponding clamping cavity 312 from the second on-off valve 5. The oil pump assembly 2 is then controlled to supply oil to the clamping cavity 312.

[0090] Specifically, the right station of the first reversing control valve 32 is energized. Simultaneously, the overload pressures of the multiple proportional relief valves 33 are controlled to be at least partially different. Simultaneously, the multiple first on-off valves 34 are energized. The oil pump assembly 2 is then controlled to supply oil to the clamping cavity 312. As hydraulic oil is injected into each clamping cavity 312, the final clamping force of the multiple clamping cavities 312 can be adjusted to at least partially differ. This effectively improves the versatility of the two-platen clamping system. During this process, the second on-off valve 5 can be energized or de-energized. Preferably, the second on-off valve 5 is de-energized to reduce energy consumption.

[0091] like Figure 3 As shown, the two-trigger control method further includes:

[0092] When the clamping cavity 312 is draining oil, the second reversing control valve 42 is controlled to connect the second on-off valve 5 to the energy recovery bottle 41. The second on-off valve 5 is controlled to connect the second reversing control valve 42 to the multiple first on-off valves 34. The multiple first on-off valves 34 are controlled to connect the corresponding mold opening cavity 313 to the second on-off valve 5. In other words, the second reversing control valve 42 is energized, the second on-off valve 5 is deenergized, and the first on-off valve 34 is deenergized.

[0093] When the chamber pressure of the clamping cavity 312 is less than or equal to the bottle mouth pressure of the energy recovery bottle 41, the second reversing control valve 42 is controlled to connect the second on-off valve 5 with the oil tank 1. That is, the second reversing control valve 42 is controlled to be de-energized.

[0094] It can be understood that when the chamber pressure of the locking cavity 312 is less than or equal to the bottle mouth pressure of the energy recovery bottle 41, the hydraulic oil in the locking cavity 312 can no longer be pressed into the energy recovery bottle 41. At this time, the second reversing control valve 42 is controlled to connect the second on-off valve 5 with the oil tank 1, so that the hydraulic oil in the locking cavity 312 can be returned to the oil tank 1.

[0095] Such an arrangement can not only achieve oil drainage of the clamping cavity 312, but also recover energy to facilitate subsequent oil supply.

[0096] Secondly, such an arrangement also allows the cooling of the product in the mold cavity and the oil draining of the clamping cavity 312 to be carried out simultaneously, thereby further shortening the product manufacturing cycle and improving efficiency.

[0097] The two-trigger control method further includes:

[0098] When the pressure in the clamping cavity 312 is equal to or less than the pressure at the mouth of the energy recovery bottle 41, the left position of the first reversing control valve 32 is energized, and the oil pump assembly 2 is controlled to supply oil to the mold release cavity 313. When the electronic ruler 39 detects that the piston rod 311 has moved to its initial position, the left position of the first reversing control valve 32 is de-energized, and the oil pump assembly 2 is controlled to stop pumping oil, allowing the product to be demolded.

[0099] It is understandable that when the cavity pressure of the clamping cavity 312 is less than or equal to the bottle mouth pressure of the energy recovery bottle 41 , the cavity pressures of the mold cavity and the clamping cavity 312 are both at atmospheric pressure.

[0100] like Figure 4 As shown, the two-trigger control method further includes:

[0101] When the oil pumping assembly 2 pumps oil, it is determined in real time whether the oil pumping pressure of the oil pumping assembly 2 is less than the bottle mouth pressure of the energy recovery bottle 41 .

[0102] If the pumping pressure of the oil pump assembly 2 is lower than the pressure at the outlet of the energy recovery bottle 41 , the third on-off valve 44 is controlled to be de-energized. The third on-off valve 44 connects the energy recovery bottle 41 to the input end of the first reversing control valve 32 .

[0103] If the pumping pressure of the oil pump assembly 2 is greater than or equal to the bottle opening pressure of the energy recovery bottle 41, the third on-off valve 44 is energized to disconnect the energy recovery bottle 41 from the input end of the first reversing control valve 32.

[0104] This arrangement enables the energy collected by the energy recovery bottle 41 to replenish the pump oil, thereby enabling the hydraulic oil to be delivered to the clamping cylinder 31 efficiently and stably.

[0105] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A two-platen clamping system, comprising an oil tank (1), an oil pump assembly (2) and a plurality of parallel-distributed clamping assemblies (3); the input end of the oil pump assembly (2) is connected to the oil tank (1); the clamping assembly (3) comprises a clamping oil cylinder (31), the clamping oil cylinder (31) comprises a cylinder body and a piston rod (311) slidably arranged on the cylinder body, the piston rod (311) divides the cylinder body into a clamping cavity (312) and a demolding cavity (313); the piston rod (311) is connected to a movable platen and can drive the movable platen to move; it is characterized in that, The clamping assembly (3) further comprises: a first reversing control valve (32), the first reversing control valve (32) being capable of selectively connecting the mold locking cavity (312) with the output end of the oil pump assembly (2), and connecting the mold breaking cavity (313) with the oil tank (1); or connecting the mold locking cavity (312) with the oil tank (1), and connecting the mold breaking cavity (313) with the output end of the oil pump assembly (2); or closing the mold locking cavity (312) and connecting the mold breaking cavity (313) with the oil tank (1); A proportional relief valve (33) and a first on-off valve (34), wherein the input end of the proportional relief valve (33) and the input end of the first on-off valve (34) are in communication, and the input end of the proportional relief valve (33) and the input end of the first on-off valve (34) are both in communication with the clamping cavity (312); and the output ends of the plurality of first on-off valves (34) are all in communication; The two-platen mold locking system further comprises a second on-off valve (5), wherein the output ends of the plurality of first on-off valves (34) are all connected to the input end of the second on-off valve (5); the first on-off valve (34) can selectively open and close the mold locking cavity (312) and the second on-off valve (5).

2. The two-platen clamping system according to claim 1, characterized in that: The first reversing control valve (32) is a three-position four-way electromagnetic reversing valve, the oil inlet P1 of the first reversing control valve (32) is connected to the output end of the oil pump assembly (2), the communication port A1 of the first reversing control valve (32) is connected to the clamping cavity (312), the communication port B1 of the first reversing control valve (32) is connected to the mold breaking cavity (313), and the oil return port T1 of the first reversing control valve (32) is connected to the oil tank (1); When the left position of the first reversing control valve (32) is energized, the oil inlet P1 is connected to the connecting port B1, and the connecting port A1 is connected to the oil return port T1; when the right position of the first reversing control valve (32) is energized, the oil inlet P1 is connected to the connecting port A1, and the connecting port B1 is connected to the oil return port T1; when the first reversing control valve (32) is de-energized, the oil inlet P1 and the connecting port A1 are both blocked, and the connecting port B1 is connected to the oil return port T1.

3. The two-platen clamping system according to claim 2, characterized in that: The mold locking assembly (3) further comprises a hydraulically controlled one-way valve (35), wherein the hydraulically controlled one-way valve (35) is arranged on a pipeline connecting the communication port A1 and the mold locking cavity (312), and a pilot oil port of the hydraulically controlled one-way valve (35) is connected to a pipeline connecting the communication port B1 and the mold breaking cavity (313).

4. The two-platen clamping system according to any one of claims 1 to 3, characterized in that: The two-platen clamping system further includes an energy recovery component, which includes: An energy recovery bottle (41), wherein the output ends of the plurality of proportional relief valves (33) are all connected to the input end of the energy recovery bottle (41); The second reversing control valve (42) and the second on-off valve (5) can selectively open and close the second reversing control valve (42) and the plurality of first on-off valves (34); the second reversing control valve (42) can selectively connect the second on-off valve (5) to the oil tank (1), or connect the second on-off valve (5) to the energy recovery bottle (41).

5. The two-platen clamping system according to claim 4, characterized in that: A first mechanical one-way valve (43) is provided on a pipeline connecting the second reversing control valve (42) and the energy recovery bottle (41). The first mechanical one-way valve (43) can guide the hydraulic oil to flow from the second reversing control valve (42) to the energy recovery bottle (41).

6. The two-platen clamping system according to claim 4, characterized in that: The energy recovery component further comprises a third on-off valve (44), which can selectively switch on and off the energy recovery bottle (41) and the input end of the first reversing control valve (32); when the energy recovery bottle (41) and the input end of the first reversing control valve (32) are connected, the third on-off valve (44) can allow the hydraulic oil flowing out of the energy recovery bottle (41) to flow unidirectionally to the input end of the first reversing control valve (32).

7. The two-platen clamping system according to any one of claims 1 to 3, characterized in that: The two-platen mold locking system further comprises an exhaust valve (36) and a second mechanical one-way valve (37); the mold locking cavity (312), the exhaust valve (36), the second mechanical one-way valve (37) and the oil tank (1) are sequentially connected.

8. Two-trigger control method, characterized in that: For implementing the two-platen clamping system according to any one of claims 1 to 7, the two-platen control method comprises: When the clamping forces of the plurality of clamping oil cylinders (31) are to be adjusted to be the same, the first reversing control valve (32) is controlled to connect the clamping cavity (312) with the output end of the oil pump assembly (2), and to connect the mold breaking cavity (313) with the oil tank (1); at the same time, the overload pressures of the plurality of proportional relief valves (33) are controlled to be the same; at the same time, the plurality of first on-off valves (34) are controlled to connect the corresponding clamping cavity (312) with the second on-off valve (5); at the same time, the second on-off valve (5) is controlled to be in an off state; and then the oil pump assembly (2) is controlled to supply oil to the clamping cavity (312).

9. The two-trigger control method according to claim 8, wherein: The two-platen control method further includes: When the clamping forces of the plurality of clamping cylinders (31) are to be adjusted to be at least partially different, the first reversing control valve (32) is controlled to connect the clamping cavity (312) with the output end of the oil pump assembly (2), and to connect the mold breaking cavity (313) with the oil tank (1); at the same time, the overload pressures of the plurality of proportional relief valves (33) are controlled to be at least partially different; at the same time, the plurality of first on-off valves (34) are controlled to disconnect the corresponding clamping cavity (312) from the second on-off valve (5); and then the oil pump assembly (2) is controlled to supply oil to the clamping cavity (312).

10. The two-trigger control method according to claim 8, wherein: The two-platen machine clamping system further comprises an energy recovery bottle (41) and a second reversing control valve (42); the second on-off valve (5) can selectively open and close the second reversing control valve (42) and a plurality of the first on-off valves (34); the second reversing control valve (42) can selectively connect the second on-off valve (5) to the oil tank (1), or connect the second on-off valve (5) to the energy recovery bottle (41); the two-platen machine control method further comprises: When the clamping cavity (312) is draining oil, the second reversing control valve (42) is controlled to connect the second on-off valve (5) with the energy recovery bottle (41); the second on-off valve (5) is controlled to connect the second reversing control valve (42) and the plurality of first on-off valves (34); and the plurality of first on-off valves (34) are controlled to connect the corresponding clamping cavity (312) and the second on-off valve (5); When the chamber pressure of the clamping cavity (312) is less than or equal to the bottle mouth pressure of the energy recovery bottle (41), the second reversing control valve (42) is controlled to connect the second on-off valve (5) with the oil tank (1).

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