Novel mold opening and closing hydraulic loop of injection molding machine

Abstract

The utility model relates to the technical field of injection molding machines, and particularly discloses a novel injection molding machine mold opening and closing hydraulic circuit which comprises a mold opening and closing module, a power module and an energy storage module, the mold opening and closing module comprises a mold opening and closing oil cylinder and a first reversing valve, the power module comprises a power system, the power system is communicated with an oil inlet of the first reversing valve, and the energy storage module is communicated with the mold opening and closing oil cylinder. The energy storage module comprises an energy accumulator, a liquid filling valve set and a liquid discharging valve set, an oil inlet of the energy accumulator is communicated with the power system through the liquid filling valve set, an oil outlet of the energy accumulator is communicated with an oil inlet of the first reversing valve through the liquid discharging valve set, and an oil outlet of the energy accumulator is communicated with an oil outlet of the second reversing valve through the liquid discharging valve set. When the injection molding machine is in a mold opening state, the energy accumulator is used for communicating the rod cavity of the mold opening and closing oil cylinder, a power system of the injection molding machine can supply oil to the material storage component, when material storage and mold opening are synchronously carried out, one power system can be saved, the cost of the injection molding machine can be greatly reduced, and the overall occupied space of the injection molding machine can be reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molding machines, and specifically to a novel hydraulic circuit for opening and closing molds in injection molding machines. Background Technology

[0002] With the rapid development of the injection molding industry, the market has put forward higher requirements for the working efficiency and production efficiency of injection molding machines. In order to achieve efficient production and shorten the molding cycle, injection molding machines need to integrate multiple automated functions. Among them, the linkage control of material storage and mold opening has become one of the key technologies. The current mainstream technical solution usually adopts two independent hydraulic power systems to drive the material storage and mold opening processes respectively: one system is dedicated to the material compression and conveying in the material storage stage, and the other system is responsible for the mold separation action in the mold opening stage.

[0003] Although this design can meet the basic functional requirements, it still has the following significant drawbacks:

[0004] I. High equipment costs: Two independent power systems require twice the hydraulic components (such as pumps, valves, pipelines, etc.), which leads to a significant increase in hardware procurement and maintenance costs. This is especially true for large injection molding equipment, where the economic burden of repeated investment is even more pronounced.

[0005] 2. Low space utilization: The stacked arrangement of multiple power systems significantly increases the overall size of the machine, which not only occupies more factory space, but also limits the flexibility of modular design of the equipment. For space-sensitive application scenarios (such as compact production lines), this defect directly restricts the applicability of the equipment.

[0006] Third, insufficient energy efficiency: The independent operation of the dual system can easily lead to power redundancy. Especially under low load conditions, some hydraulic components may be in an unloaded state, resulting in energy waste, which is contrary to the current development trend of energy conservation and emission reduction in the industrial field. Summary of the Invention

[0007] This utility model addresses the aforementioned problems and aims to provide a novel hydraulic circuit for opening and closing molds in injection molding machines. It utilizes an accumulator to replace a power system for providing hydraulic oil for mold opening, thereby saving a power system, reducing costs, and minimizing space occupancy.

[0008] To achieve the above objectives, this utility model provides a novel hydraulic circuit for opening and closing the mold of an injection molding machine, comprising:

[0009] The mold opening and closing module includes a mold opening and closing cylinder and a first directional valve;

[0010] The power module includes a power system, which is connected to the oil inlet of the first reversing valve and can be connected to the rodless chamber or rod chamber of the mold opening and closing cylinder through the first reversing valve.

[0011] An energy storage module includes an accumulator, a filling valve group, and a drain valve group. The oil inlet of the accumulator can be connected to the power system through the filling valve group, and the oil outlet of the accumulator can be connected to the oil inlet of the first reversing valve through the drain valve group.

[0012] When the injection molding machine is in the mold-opening state, the oil outlet of the accumulator is connected to the oil inlet of the first reversing valve through the drain valve assembly, and can also be connected to the rod chamber of the mold opening and closing cylinder through the first reversing valve.

[0013] According to the above-described novel hydraulic circuit for opening and closing molds of an injection molding machine, the filling valve group includes a second directional valve, the oil inlet of the second directional valve is connected to the power system, and the second directional valve is provided with a first electromagnet and a first oil outlet, the first oil outlet being connected to the oil inlet of the accumulator.

[0014] When the first electromagnet is energized, the oil inlet of the second reversing valve is connected to the first oil outlet.

[0015] According to the above-described novel hydraulic circuit for opening and closing the mold of an injection molding machine, the filling valve group further includes a first check valve. The first check valve is located between the first oil outlet and the oil inlet of the accumulator, and the oil inlet of the first check valve is connected to the first oil outlet, and the oil outlet of the first check valve is connected to the oil inlet of the accumulator.

[0016] According to the above-described novel hydraulic circuit for opening and closing the mold of an injection molding machine, the power module further includes a second check valve. The oil inlet of the second check valve is connected to the power system, and the oil outlet of the second check valve is simultaneously connected to the oil inlet of the first reversing valve and the oil inlet of the second reversing valve.

[0017] According to the above-described novel hydraulic circuit for opening and closing the mold of an injection molding machine, the second reversing valve is further provided with a second oil outlet, which is connected to the oil inlet of the first reversing valve. When the first electromagnet is de-energized, the oil inlet of the second reversing valve is connected to the second oil outlet.

[0018] According to the above-described novel hydraulic circuit for opening and closing the mold of an injection molding machine, the filling valve group further includes a pressure switch, which is fixed on one side of the accumulator and can control the first electromagnet to be de-energized.

[0019] According to the above-described novel hydraulic circuit for opening and closing the mold of an injection molding machine, the discharge valve assembly includes a discharge cartridge valve and a discharge control valve. The oil inlet of the discharge cartridge valve is connected to the oil outlet of the accumulator, and the oil outlet of the discharge cartridge valve is connected to the oil inlet of the first reversing valve. The discharge control valve is used to control the opening or closing of the discharge cartridge valve.

[0020] According to the above-described novel hydraulic circuit for opening and closing molds in an injection molding machine, the energy storage module further includes a pressure relief valve and a safety relief valve, wherein the oil inlets of the pressure relief valve and the safety relief valve are both connected to the oil outlet of the energy storage device.

[0021] The novel hydraulic circuit for opening and closing molds of an injection molding machine described above further includes an oil storage module, which includes an oil tank. The first directional valve is configured as a proportional directional valve. The first directional valve is provided with a first oil inlet, a first oil return port, a first variable oil port, a second variable oil port, and a second electromagnet. The first oil inlet is simultaneously connected to the oil outlet of the power system and the discharge valve assembly. The first variable oil port is connected to the rodless chamber of the mold opening and closing cylinder. The second variable oil port is connected to the rod chamber of the mold opening and closing cylinder. The first oil return port is connected to the oil tank.

[0022] When the second electromagnet is de-energized, the first oil inlet is connected to the first variable oil port, and the second variable oil port is connected to the first return oil port. When the second electromagnet is energized, the first oil inlet is connected to the second variable oil port, and the first variable oil port is connected to the first return oil port.

[0023] According to the above-described novel hydraulic circuit for opening and closing molds of an injection molding machine, the opening and closing module further includes a safety cartridge valve and a pilot control valve. The oil inlet of the safety cartridge valve is connected to the first variable oil port, and the oil outlet of the safety cartridge valve is connected to the rodless chamber of the opening and closing cylinder. The pilot control valve is used to control the opening or closing of the safety cartridge valve.

[0024] This utility model has the following beneficial effects:

[0025] 1. When the injection molding machine is in the mold opening state, the accumulator can be used to connect the rod cavity of the mold opening and closing cylinder, so that the power system of the injection molding machine can be used to supply oil to the material storage component. When material storage and mold opening are carried out simultaneously, a power system can be saved, which can significantly reduce the cost of the injection molding machine and reduce the overall space occupied by the injection molding machine.

[0026] 2. The first directional valve is set as a proportional directional valve, which can adjust the hydraulic flow proportionally by adjusting the opening size of the proportional directional valve, thereby improving the accuracy of mold opening and closing actions.

[0027] 3. One-way valves are installed in both the power system and the filling valve assembly to effectively prevent oil backflow and improve safety performance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall oil circuit in an embodiment.

[0029] In the picture:

[0030] 1. Mold opening and closing cylinder; 2. First directional valve; 21. Second electromagnet; 3. Power system; 4. Accumulator; 5. Second directional valve; 51. First electromagnet; 6. First check valve; 7. Second check valve; 8. Pressure switch; 9. Discharge cartridge valve; 10. Discharge control valve; 11. Pressure relief valve; 12. Safety relief valve; 13. Oil tank; 14. Safety cartridge valve; 15. Pilot control valve. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] like Figure 1 As shown, a novel hydraulic circuit for opening and closing molds in an injection molding machine includes an opening and closing module, a power module, and an energy storage module. The power module provides the opening and closing power to the opening and closing module and simultaneously supplies hydraulic oil to the energy storage module, facilitating the storage of hydraulic oil. The energy storage module supplies oil to the opening and closing module when the injection molding machine is in the mold-opening state, while the power module can supply oil to the material storage module at this time, achieving synchronous operation of both. Only one power module is required, which improves production efficiency, avoids a significant increase in costs, and reduces the space occupied by the injection molding machine.

[0033] Specifically, the mold opening and closing module includes a mold opening and closing cylinder 1 and a first reversing valve 2. The power module includes a power system 3, which is connected to the oil inlet of the first reversing valve 2 and can be connected to the rodless chamber or the rod chamber of the mold opening and closing cylinder 1 through the first reversing valve 2. When the power system 3 is connected to the rodless chamber of the mold opening and closing cylinder 1, it can drive the piston rod of the mold opening and closing cylinder 1 to extend and perform the mold closing action. When the power system 3 is connected to the rod chamber of the mold opening and closing cylinder 1, it can drive the piston rod of the mold opening and closing cylinder 1 to retract and perform the mold opening and closing action.

[0034] The energy storage module includes an accumulator 4, a filling valve assembly, and a drain valve assembly. The oil inlet of the accumulator 4 can be connected to the power system 3 through the filling valve assembly, and the oil outlet of the accumulator 4 can be connected to the oil inlet of the first directional valve 2 through the drain valve assembly. That is, the filling valve assembly can control the connection between the power system 3 and the oil inlet of the accumulator 4. When connected, the power system 3 can fill the accumulator 4 with liquid. The drain valve assembly can control the connection between the oil outlet of the accumulator 4 and the oil inlet of the first directional valve 2. When connected, the accumulator 4 can supply oil to the mold opening and closing cylinder 1 through the first directional valve 2. In this embodiment, when the injection molding machine is in operation... When the mold is open, if the power module needs to supply oil to the storage module, the oil outlet of the accumulator 4 can be connected to the oil inlet of the first reversing valve 2 through the drain valve group. That is, the drain valve group is opened, and it can be connected to the rod chamber of the mold opening and closing cylinder 1 through the first reversing valve 2. In this case, the accumulator 4 can connect to the rod chamber of the mold opening and closing cylinder 1, and the mold opening and closing cylinder 1 can drive the mold opening action. This realizes the synchronous operation of mold opening and material storage, improves product processing efficiency, and only requires the addition of one energy storage module. Compared with the scheme of using two power systems 3, it has lower cost and occupies less space.

[0035] Of course, when the material storage action and the mold opening action do not need to be performed simultaneously, the injection molding machine can still use the power system 3 to supply oil to the rod cavity of the mold opening and closing cylinder 1, which can also meet the needs. It can be switched according to the actual needs of the operator.

[0036] In this embodiment, the first directional valve 2 is set as a proportional directional valve, which can precisely adjust the size of the opening of its internal oil passage, thereby achieving proportional control and improving the accuracy of mold opening and closing. The size of its oil passage opening can be controlled according to the energization of the proportional directional valve.

[0037] Specifically, the filling valve assembly includes a second directional valve 5. The oil inlet of the second directional valve 5 is connected to the power system 3. The second directional valve 5 is equipped with a first electromagnet 51 and a first oil outlet. The first oil outlet is connected to the oil inlet of the accumulator 4. When the first electromagnet 51 is energized, the oil inlet of the second directional valve 5 is connected to the first oil outlet. When the accumulator 4 needs to be filled with liquid, the system controls the first electromagnet 51 to be energized. At this time, the power system 3 can directly supply oil to the accumulator 4, so that the hydraulic oil pressure in the accumulator 4 is kept at a high level.

[0038] Of course, in order to prevent the hydraulic oil in the accumulator 4 from flowing back into the power system 3 and causing damage to the power system 3, the filling valve group also includes a first check valve 6. The first check valve 6 is located between the first oil outlet and the oil inlet of the accumulator 4, and the oil inlet of the first check valve 6 is connected to the first oil outlet. The oil outlet of the first check valve 6 is connected to the oil inlet of the accumulator 4. The first check valve 6 can restrict the hydraulic oil to flow only from the second reversing valve 5 to the accumulator 4. The oil in the accumulator 4 cannot flow to the second reversing valve 5, thus avoiding backflow of oil.

[0039] Of course, in order to prevent the hydraulic oil in the mold opening and closing cylinder 1 from flowing back into the power system 3, the power module also includes a second check valve 7. The oil inlet of the second check valve 7 is connected to the power system 3, and the oil outlet of the second check valve 7 is connected to the oil inlet of the first reversing valve 2 and the oil inlet of the second reversing valve 5. Then the hydraulic oil output by the power system 3 can be delivered to the first reversing valve 2 or the second reversing valve 5 through the second check valve 7, avoiding the backflow of hydraulic oil from the two places into the power system 3 and improving safety performance.

[0040] Of course, in this embodiment, the second reversing valve 5 is also provided with a second oil outlet, which is connected to the oil inlet of the first reversing valve 2. When the first electromagnet 51 is de-energized, the oil inlet of the second reversing valve 5 is connected to the second oil outlet. When the first electromagnet 51 is de-energized, the hydraulic oil output by the power system 3 cannot be delivered to the accumulator 4, but can only flow to the first reversing valve 2 to control the mold opening and closing cylinder 1 to perform the mold opening and closing action. When the first electromagnet 51 is energized, the hydraulic oil output by the power system 3 can be delivered to the accumulator 4 to replenish the oil in the accumulator 4.

[0041] Of course, in order to control whether the accumulator 4 needs to be replenished with oil, the filling valve group also includes a pressure switch 8. The pressure switch 8 is fixed on one side of the accumulator 4. The pressure switch 8 is electrically connected to the control system of the injection molding machine. After detecting that the oil pressure in the accumulator 4 has reached the preset value, the pressure switch 8 feeds the signal back to the control system of the injection molding machine. The control system controls the first electromagnet 51 to de-energize and stop the continued supply of liquid.

[0042] In addition to setting pressure switch 8 to control whether the liquid supply is normal, a pressure gauge is also set on one side of accumulator 4. This pressure gauge is used for the operator to observe and monitor the pressure in real time.

[0043] Specifically, the drain valve assembly includes a drain cartridge valve 9 and a drain control valve 10. The oil inlet of the drain cartridge valve 9 is connected to the oil outlet of the accumulator 4, and the oil outlet of the drain cartridge valve 9 is connected to the oil inlet of the first directional valve 2. The drain control valve 10 is used to control the opening or closing of the drain cartridge valve 9. In this embodiment, the drain control valve 10 is a pilot valve for the drain cartridge valve 9. An electromagnet is also provided on the drain control valve 10. When the electromagnet is energized, the drain control valve 10 can control the drain cartridge valve 9 to open, and the oil in the accumulator 4 can flow into the oil inlet of the first directional valve 2 through the drain cartridge valve 9.

[0044] Of course, in order to improve the safety performance of the accumulator 4, the energy storage module also includes a pressure relief valve 11 and a safety relief valve 12. The oil inlets of the pressure relief valve 11 and the safety relief valve 12 are connected to the oil outlet of the accumulator 4. The pressure relief valve 11 is used for manual pressure relief to discharge the hydraulic oil in the accumulator 4, while the safety relief valve 12 is used to ensure the safety of the accumulator 4. That is, when the oil pressure in the accumulator 4 exceeds the safety threshold, the oil can drive the safety relief valve 12 to open and relieve pressure.

[0045] In this embodiment, an oil storage module is also included. The oil storage module includes an oil tank 13. The first reversing valve 2 is a proportional reversing valve, and the first reversing valve 2 is provided with a first oil inlet, a first oil return port, a first variable oil port, a second variable oil port, and a second electromagnet 21. The first oil inlet is simultaneously connected to the power system 3 and the oil outlet of the drain valve group. A first pipe is provided between the first oil inlet and the power system 3. The oil inlet of the filling valve group and the oil outlet of the drain valve group are both connected to the first pipe. The first variable oil port is connected to the rodless chamber of the mold opening and closing cylinder 1, the second variable oil port is connected to the rod chamber of the mold opening and closing cylinder 1, and the first oil return port is connected to the oil tank 13. When the second electromagnet 21 is de-energized, the first oil inlet is connected to the first variable oil port, and the second variable oil port is connected to the first oil return port. In this case, the hydraulic oil supplied by the power system 3 enters the rodless cavity of the mold opening and closing cylinder 1 through the first oil inlet and the first variable oil inlet. The hydraulic oil in the rod cavity of the mold opening and closing cylinder 1 enters the oil tank 13 through the second variable oil inlet and the first return oil inlet, realizing the mold closing action. When the second electromagnet 21 is energized, the first oil inlet and the second variable oil inlet are connected, and the first variable oil inlet and the first return oil inlet are connected. In this case, the hydraulic oil supplied by the power system 3 enters the rod cavity of the mold opening and closing cylinder 1 through the first oil inlet and the second variable oil inlet. The hydraulic oil in the rodless cavity of the mold opening and closing cylinder 1 enters the oil tank 13 through the first variable oil inlet and the first return oil inlet, realizing the mold opening action. Of course, in this case, the accumulator 4 can also supply oil to the rod cavity of the mold opening and closing cylinder 1.

[0046] Specifically, the mold opening and closing module also includes a safety cartridge valve 14 and a pilot control valve 15. The oil inlet of the safety cartridge valve 14 is connected to the first variable oil port, and the oil outlet of the safety cartridge valve 14 is connected to the rodless chamber of the mold opening and closing cylinder 1. The safety cartridge valve 14 is used to control the oil inlet of the rodless chamber of the mold opening and closing cylinder 1, that is, to control the mold closing action of the injection molding machine. In this embodiment, the safety cartridge valve 14 is electrically connected to the protective door of the injection molding machine. That is, when the protective door of the injection molding machine is open, the pilot control valve 15 is used to control the safety cartridge valve 14 to close. At this time, the hydraulic oil cannot enter the rodless chamber of the mold opening and closing cylinder 1, cutting off the mold closing action and improving safety performance. When the protective door is closed, the pilot control valve 15 is used to control the safety cartridge valve 14 to open so that the hydraulic oil can flow normally.

[0047] The technical solution of this utility model has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of this utility model. The specific embodiments described herein are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0048] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0049] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A novel hydraulic circuit for opening and closing molds in an injection molding machine, characterized in that, include: The mold opening and closing module includes a mold opening and closing cylinder and a first directional valve; The power module includes a power system, which is connected to the oil inlet of the first reversing valve and can be connected to the rodless chamber or rod chamber of the mold opening and closing cylinder through the first reversing valve. An energy storage module includes an accumulator, a filling valve group, and a drain valve group. The oil inlet of the accumulator can be connected to the power system through the filling valve group, and the oil outlet of the accumulator can be connected to the oil inlet of the first reversing valve through the drain valve group. When the injection molding machine is in the mold-opening state, the oil outlet of the accumulator is connected to the oil inlet of the first reversing valve through the drain valve assembly, and can also be connected to the rod chamber of the mold opening and closing cylinder through the first reversing valve.

2. The novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 1, characterized in that, The filling valve assembly includes a second reversing valve, the oil inlet of the second reversing valve is connected to the power system, and the second reversing valve is provided with a first electromagnet and a first oil outlet, the first oil outlet being connected to the oil inlet of the accumulator. When the first electromagnet is energized, the oil inlet of the second reversing valve is connected to the first oil outlet.

3. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 2, characterized in that, The filling valve assembly further includes a first check valve, which is located between the first oil outlet and the oil inlet of the accumulator, and the oil inlet of the first check valve is connected to the first oil outlet, and the oil outlet of the first check valve is connected to the oil inlet of the accumulator.

4. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 2, characterized in that, The power module also includes a second check valve, the oil inlet of which is connected to the power system, and the oil outlet of which is connected to both the oil inlet of the first reversing valve and the oil inlet of the second reversing valve.

5. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 2, characterized in that, The second directional valve is also provided with a second oil outlet, which is connected to the oil inlet of the first directional valve. When the first electromagnet is de-energized, the oil inlet of the second directional valve is connected to the second oil outlet.

6. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 2, characterized in that, The filling valve assembly also includes a pressure switch, which is fixed to one side of the accumulator and can control the first electromagnet to be de-energized.

7. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 1, characterized in that, The drain valve assembly includes a drain cartridge valve and a drain control valve. The inlet of the drain cartridge valve is connected to the outlet of the accumulator, and the outlet of the drain cartridge valve is connected to the inlet of the first reversing valve. The drain control valve is used to control the opening or closing of the drain cartridge valve.

8. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 1 or 7, characterized in that, The energy storage module also includes a pressure relief valve and a safety overflow valve, the oil inlets of which are connected to the oil outlet of the energy storage unit.

9. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 1, characterized in that, It also includes an oil storage module, which includes an oil tank. The first reversing valve is a proportional reversing valve, and the first reversing valve is provided with a first oil inlet, a first oil return port, a first variable oil port, a second variable oil port, and a second electromagnet. The first oil inlet is simultaneously connected to the oil outlet of the power system and the drain valve group. The first variable oil port is connected to the rodless chamber of the mold opening and closing cylinder. The second variable oil port is connected to the rod chamber of the mold opening and closing cylinder. The first oil return port is connected to the oil tank. When the second electromagnet is de-energized, the first oil inlet is connected to the first variable oil port, and the second variable oil port is connected to the first return oil port. When the second electromagnet is energized, the first oil inlet is connected to the second variable oil port, and the first variable oil port is connected to the first return oil port.

10. A novel hydraulic circuit for opening and closing molds in an injection molding machine according to claim 9, characterized in that, The mold opening and closing module also includes a safety cartridge valve and a pilot control valve. The oil inlet of the safety cartridge valve is connected to the first variable oil port, and the oil outlet of the safety cartridge valve is connected to the rodless chamber of the mold opening and closing cylinder. The pilot control valve is used to control the opening or closing of the safety cartridge valve.

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