Energy storage device, injection molding machine and working method of injection molding machine

Abstract

The invention belongs to the technical field of energy recycling of vertical injection molding machines, and discloses an energy storage device, an injection molding machine and a working method of the injection molding machine. The energy storage device is used for energy storage of the injection molding machine and comprises an energy storage unit and an oil supply unit, the energy storage unit comprises an energy storage tank and a first control valve, the oil supply unit comprises an oil tank, the energy storage tank is communicated with the first control valve, and the first control valve is communicated with a rodless cavity of a hydraulic oil cylinder of the injection molding machine. The oil tank can be selectively communicated with or not communicated with the rodless cavity and the rod cavity of the hydraulic oil cylinder, during mold closing, the oil supply unit supplies oil to the rod cavity, so that the pressure in the rod cavity is increased, the first control valve is opened at the moment, and hydraulic oil in the rodless cavity enters the energy storage tank after passing through the first control valve; and when the mold is opened, the rod cavity discharges oil, the first control valve is opened, and high-pressure hydraulic oil in the energy storage tank enters the rodless cavity, so that the movable mold plate is jacked up, and the mold opening operation is completed.

Description

Technical Field

[0001] The invention relates to the technical field of energy recovery and utilization of vertical injection molding machines, and in particular to an energy storage device, an injection molding machine and a working method thereof. Background Art

[0002] Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. Injection molding machines are mainly divided into vertical injection molding machines, horizontal injection molding machines and all-electric injection molding machines. It is composed of injection system, clamping system, hydraulic transmission system, electrical control system, lubrication system, heating and cooling system, safety monitoring system, etc. The function of the clamping system is to ensure the closing, opening and ejection of the mold. For vertical injection molding machines, the clamping system usually includes an oil cylinder, the cylinder body of the oil cylinder is fixedly installed on the static template, and the telescopic rod of the oil cylinder is fixedly installed on the dynamic template. The hydraulic transmission system inputs or outputs hydraulic oil to the oil cylinder, and the telescopic rod of the oil cylinder extends or retracts, thereby driving the dynamic template to move up and down. However, when the dynamic template moves down, the gravitational potential energy of the dynamic template and the energy of the hydraulic oil cannot be effectively utilized, resulting in low energy utilization of the system.

[0003] Therefore, an energy storage device, an injection molding machine and a working method thereof are needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide an energy storage device, an injection molding machine and a working method thereof. The energy storage device can store the gravitational potential energy and hydraulic energy during the downward movement of the movable platen during mold closing of the injection molding machine. The stored gravitational potential energy and hydraulic energy can be effectively utilized when the mold is opened next time, thereby improving the energy utilization rate of the injection molding machine, thereby reducing the total energy consumption of the injection molding machine and reducing energy waste.

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

[0006] An energy storage device is used for energy storage of an injection molding machine, wherein the injection molding machine comprises a static platen, a dynamic platen and a hydraulic cylinder, wherein a cylinder body of the hydraulic cylinder is fixedly mounted on the static platen, a telescopic rod of the hydraulic cylinder is fixedly mounted on the dynamic platen, and the hydraulic cylinder has a rodless cavity and a rod cavity, and the energy storage device comprises:

[0007] An energy storage unit, the energy storage unit comprising an energy storage tank and a first control valve, the energy storage tank being able to communicate with the rodless cavity, the first control valve being arranged on a pipeline between the energy storage tank and the rodless cavity;

[0008] An oil supply unit, wherein the oil supply unit includes an oil tank, the oil tank can be communicated with the rodless chamber, the oil tank can be communicated with the rod chamber, and the oil supply unit has a first state, a second state and an oil return state. When the oil supply unit is in the first state, the oil supply unit supplies oil to the rodless chamber. When the oil supply unit is in the second state, the oil supply unit supplies oil to the rod chamber. When the oil supply unit is in the oil return state, the hydraulic oil in the rod chamber returns to the oil tank.

[0009] As an optional technical solution, the energy storage unit further includes a pressure detection component, and the pressure detection component is disposed in the energy storage tank.

[0010] As an optional technical solution, the energy storage unit further includes a safety valve, and the safety valve is arranged between the energy storage tank and the oil tank.

[0011] As an optional technical solution, the oil supply unit also includes a second control valve, the second control valve having a first interface, a second interface, a third interface and a fourth interface, the first interface and the fourth interface are both connected to the oil tank, the second interface is connected to the rodless chamber, and the third interface is connected to the rod chamber, when the oil supply unit is in the first state, the first interface and the second interface are connected; when the oil supply unit is in the second state, the first interface and the third interface are connected, and when the oil supply unit is in the oil return state, the third interface and the fourth interface are connected.

[0012] As an optional technical solution, the oil supply unit further includes a third control valve, and the third control valve is arranged on the pipeline between the second interface and the rodless chamber.

[0013] As an optional technical solution, the oil supply unit further includes a power assembly, and the power assembly is arranged on a pipeline between the oil tank and the first interface.

[0014] As an optional technical solution, the oil supply unit also includes a filling pipeline and a filling valve, one end of the filling pipeline is connected to the pipeline between the power component and the first interface, the other end of the filling pipeline is connected to the energy storage tank, and the filling valve is arranged on the filling pipeline.

[0015] As an optional technical solution, the oil supply unit also includes an overflow valve and an overflow pipeline, one end of the overflow pipeline is connected to the pipeline between the power component and the first interface, and the other end of the overflow pipeline is connected to the oil tank, and the overflow valve is arranged on the overflow pipeline.

[0016] The present invention also adopts the following technical solutions:

[0017] An injection molding machine, the injection molding machine includes a static mold plate, a dynamic mold plate and a hydraulic cylinder, the injection molding machine also includes the energy storage device mentioned above, the static mold plate and the dynamic mold plate are arranged in sequence along the height direction, the cylinder body of the hydraulic cylinder is fixedly arranged on the static mold plate, the telescopic rod of the hydraulic cylinder is fixedly arranged on the dynamic mold plate, the hydraulic cylinder telescopes to drive the dynamic mold plate to approach or move away from the static mold plate, the hydraulic cylinder has a rodless cavity and a rod cavity, the energy storage tank of the energy storage device can be communicated with the rodless cavity, the oil tank of the energy storage device can be communicated with the rodless cavity, and the oil tank can be communicated with the rod cavity.

[0018] The present invention also adopts the following technical solutions:

[0019] A working method, which is applicable to the injection molding machine as described above, and comprises:

[0020] S10, determining whether the injection molding machine needs to close the mold, if so, proceeding to S20;

[0021] S20, the first control valve is opened, the oil supply unit inputs hydraulic oil into the rod chamber, the hydraulic oil in the rodless chamber enters the energy storage tank under the push of the hydraulic oil in the rod chamber, the energy storage tank stores energy, and after the movable platen and the static platen are in contact, the first control valve is closed;

[0022] S30, judging whether the injection molding machine needs to open the mold, if so, entering S40;

[0023] S40, the first control valve is opened, the hydraulic oil in the energy storage tank enters the rodless chamber, the energy storage tank releases energy, and the movable plate rises.

[0024] Beneficial effects of the present invention:

[0025] The present invention discloses an energy storage device, which is used for energy storage of an injection molding machine. The energy storage device comprises an energy storage unit and an oil supply unit. The energy storage unit comprises an energy storage tank and a first control valve. The oil supply unit comprises an oil tank. The energy storage tank is connected to the first control valve. The first control valve is connected to the rodless cavity of the hydraulic cylinder of the injection molding machine. The oil tank can be selectively connected to or not connected with the rodless cavity and the rod cavity of the hydraulic cylinder. When closing the mold, the oil supply unit supplies oil to the rod cavity, so that the pressure in the rod cavity increases. At this time, the first control valve is opened, and the hydraulic oil in the rodless cavity will enter the energy storage tank after passing through the first control valve, thereby storing the gravitational potential energy and hydraulic energy of the movable template. When opening the mold, the rod cavity is drained, the first control valve is opened, and the high-pressure hydraulic oil in the energy storage tank will enter the rodless cavity to lift the movable template to complete the mold opening operation. This energy storage device can effectively store the gravitational potential energy and hydraulic energy of the moving platen in the energy storage tank for the next mold opening. This energy storage device improves the energy utilization rate of the injection molding machine, reduces energy consumption, and achieves energy conservation and emission reduction.

[0026] The present invention also discloses an injection molding machine, which includes a static mold plate, a dynamic mold plate and a hydraulic cylinder, and also includes the above-mentioned energy storage device, the energy storage tank of the energy storage device can be connected to the rodless cavity, the oil tank of the energy storage device can be connected to the rodless cavity, and the oil tank can be connected to the rod cavity. This injection molding machine can store the gravitational potential energy and hydraulic energy of the dynamic mold plate when closing the mold, improve the energy utilization rate of the injection molding machine, and the stored energy can be used for the next mold opening, thereby reducing energy consumption and achieving energy saving and emission reduction of the injection molding machine.

[0027] The present invention also discloses a working method. When the injection molding machine needs to close the mold, the first control valve is opened, and the oil supply unit inputs hydraulic oil into the rod chamber. The hydraulic oil in the rodless chamber can enter the energy storage tank after passing through the first control valve, thereby storing the gravitational potential energy and hydraulic energy of the movable template. After the mold closing is completed, the first control valve is closed. When the mold is opened next time, the first control valve is opened, the rod chamber is drained, and the hydraulic oil in the energy storage tank enters the rodless chamber after passing through the first control valve, so that the movable template moves up, and then the mold is opened. This working method improves the energy utilization rate of the injection molding machine and effectively reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a partial structural schematic diagram of an injection molding machine according to an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a second control valve according to an embodiment of the present invention;

[0030] Figure 3 is a flow chart of a working method of an embodiment of the present invention.

[0031] In the figure:

[0032] 1. Injection molding machine; 2. Static mold plate; 3. Moving mold plate; 4. Hydraulic cylinder; 401. Rod chamber; 402. Rodless chamber; 403. Telescopic rod;

[0033] 10. Energy storage unit; 11. Energy storage tank; 12. First control valve; 13. Pressure gauge; 14. Pressure sensor; 15. Pressure relief valve; 16. Safety valve; 17. Switch valve;

[0034] 20. Oil supply unit; 21. Oil tank; 22. Second control valve; 221. First interface; 222. Second interface; 223. Third interface; 224. Fourth interface; 23. Third control valve; 24. Oil pump; 25. Filling valve; 251. Filling pipeline; 26. Overflow valve; 261. Overflow pipeline. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] like Figure 1 and Figure 2 As shown, an energy storage device is provided in this embodiment, which specifically includes an energy storage unit 10 and an oil supply unit 20. The energy storage unit 10 includes an energy storage tank 11 and a first control valve 12. The energy storage tank 11 can be connected to the rodless chamber 402. The first control valve 12 is arranged on the pipeline between the energy storage tank 11 and the rodless chamber 402. The oil supply unit 20 includes an oil tank 21. The oil tank 21 can be connected to the rodless chamber 402. The oil tank 21 can be connected to the rod chamber 401, and the oil supply unit 20 has a first state, a second state and an oil return state. When the oil supply unit 20 is in the first state, the oil supply unit 20 supplies oil to the rodless chamber 402. When the oil supply unit 20 is in the second state, the oil supply unit 20 supplies oil to the rod chamber 401. When the oil supply unit 20 is in the oil return state, the hydraulic oil in the rod chamber 401 returns to the oil tank 21.

[0040] Specifically, in this embodiment, a first control valve 12 is provided on the pipeline between the energy storage tank 11 and the rodless chamber 402. The first control valve 12 can control the on-off of the pipeline between the energy storage tank 11 and the rodless chamber 402, thereby effectively controlling the energy storage or release of the energy storage device, avoiding unnecessary energy loss, and improving the flexibility of use, which is convenient for personnel control. The oil tank 21 can be connected to the rodless chamber 402. This arrangement can open the mold of the injection molding machine 1 normally when the energy storage device cannot function normally, ensuring the normal use of the injection molding machine 1 and the normal production of the product. In this embodiment, there are two specific situations in which the energy storage device cannot function normally. One is that when the injection molding machine 1 is used for the first time, the energy storage device has not yet obtained hydraulic oil from the rodless chamber 402. Therefore, the energy storage device does not have the energy storage conditions. The other is that the energy storage device cannot store energy normally when a failure occurs. When these two situations occur, the oil supply unit 20 is required to be in the first state, and the oil tank 21 can provide hydraulic oil to the rodless chamber 402 to ensure that the pressure of the hydraulic oil in the rodless chamber 402 is greater than the pressure of the hydraulic oil in the rod chamber 401, thereby ensuring that the movable template 3 can rise and fall normally, so as to ensure the normal use function of the injection molding machine 1 and enhance the ability of the injection molding machine to cope with risks. When the oil tank 21 is connected to the rod chamber 401, only when the oil supply unit 20 is in the second state can it ensure that the oil tank 21 normally inputs hydraulic oil to the rod chamber 401, thereby ensuring the normal downward movement of the movable template 3, thereby ensuring the normal mold closing of the injection molding machine 1 and the normal use function of the injection molding machine 1, and enabling the hydraulic oil in the rodless chamber 402 to normally enter the energy storage tank 11 for energy storage, thereby ensuring that the energy storage tank 11 can normally provide high-pressure hydraulic oil to the rodless chamber 402 when the mold is opened next time, thereby ensuring the normal mold opening of the injection molding machine 1. When the oil tank 21 is connected to the rod chamber 401, if the oil supply unit 20 is in the oil return state, the hydraulic oil in the rod chamber 401 flows back to the oil tank 21. This arrangement enables the rod chamber 401 to be in a low-pressure state when the energy storage tank 11 outputs hydraulic oil to the rodless chamber 402, which can minimize the loss caused by the energy released by the energy storage tank 11 to overcome the pressure of the hydraulic oil in the rod chamber 401, thereby reducing energy loss, improving energy utilization, ensuring the normal rise of the moving template 3, and thus ensuring the normal function of the injection molding machine 1.

[0041] Furthermore, the energy storage unit 10 also includes a pressure detection component, which is disposed in the energy storage tank 11. Specifically, in the present embodiment, the pressure detection component includes a pressure gauge 13, which is connected to the energy storage tank 11 through a pipeline, and the operator can know the pressure value of the energy storage tank 11 through the value of the pressure gauge 13, thereby avoiding the safety risk caused by the excessive pressure of the energy storage tank 11 and ensuring the safety during use. At the same time, when the value of the pressure gauge 13 is lower than the preset range of the pressure of the energy storage tank 11, the operator can also replenish the hydraulic oil to the energy storage tank 11 in time to ensure that the pressure of the energy storage tank 11 can meet the needs of the next mold opening and ensure the normal function of the injection molding machine 1.

[0042] Specifically, in this embodiment, the pressure detection component also includes a pressure sensor 14, which is connected to the energy storage tank 11 through a pipeline and can monitor the pressure of the hydraulic oil in the energy storage tank 11 in real time. In order to facilitate control, the energy storage device in this embodiment also includes a control unit, which includes an electrically connected control component and a display screen. The pressure sensor 14 is electrically connected to the control component. The pressure sensor 14 feeds back the pressure value of the energy storage tank 11 to the control component, and the control component then displays the real-time pressure value on the display screen, so that personnel can obtain the pressure value of the energy storage tank 11 in real time, thereby ensuring safety during use.

[0043] Furthermore, in this embodiment, the energy storage unit 10 also includes a safety valve 16, which is arranged between the energy storage tank 11 and the oil tank 21. When the pressure in the energy storage tank 11 is too high, part of the hydraulic oil in the energy storage tank 11 can be discharged into the oil tank 21 through the safety valve 16 to ensure safety during use.

[0044] Optionally, in the present embodiment, the control component is electrically connected to the safety valve 16. When the pressure value obtained by the control component from the pressure sensor 14 exceeds a preset range of the pressure value of the energy storage tank 11, the control component can control the safety valve 16 to open, thereby causing part of the hydraulic oil in the energy storage tank 11 to be discharged into the oil tank 21. Until the pressure value obtained by the control component from the pressure sensor 14 is within the preset range of the pressure value of the energy storage tank 11, the control component controls the safety valve 1615 to close, thereby ensuring the safe use of the energy storage tank 11.

[0045] Optionally, the energy storage unit 10 further includes a pressure relief valve 15, which is also disposed between the energy storage tank 11 and the oil tank 21. Specifically, in the present embodiment, when the energy storage tank 11 fails and needs to be replaced or when the energy storage tank 11 needs to be repaired, the pressure relief valve 15 is opened, and part of the hydraulic oil in the energy storage tank 11 can be discharged into the oil tank 21, thereby ensuring that the energy storage tank 11 is in a low-pressure state during repair or replacement, thereby avoiding harm to personnel. In the present embodiment, during the process of energy storage or energy release of the energy storage tank 11, the pressure relief valve 15 is always in a closed state to ensure that the energy storage tank 11 will not be depressurized, otherwise the energy storage tank 11 will not be able to open the mold due to insufficient pressure, or the energy storage tank 11 will not be able to be pressurized, so the pressure relief valve 15 is only used when the energy storage tank 11 is repaired, replaced or needs to be depressurized.

[0046] Specifically, in this embodiment, the energy storage unit 10 further includes a switch valve 17, which is disposed between the energy storage tank 11 and the first control valve 12 to further ensure safety in use.

[0047] For further information, please refer to Figure 2 The oil supply unit 20 also includes a second control valve 22, which has a first interface 221, a second interface 222, a third interface 223 and a fourth interface 224. The first interface 221 and the fourth interface 224 are both connected to the oil tank 21, the second interface 222 is connected to the rodless chamber 402, and the third interface 223 is connected to the rod chamber 401. When the oil supply unit 20 is in the first state, the first interface 221 and the second interface 222 are connected; when the oil supply unit 20 is in the second state, the first interface 221 and the third interface 223 are connected. When the oil supply unit 20 is in the oil return state, the third interface 223 and the fourth interface 224 are connected. Specifically, in this embodiment, the second control valve 22 is a directional valve. When it is necessary to input hydraulic oil into the rodless chamber 402, the first interface 221 and the second interface 222 are connected, and the hydraulic oil in the oil tank 21 can enter the rodless chamber 402 after passing through the first interface 221 and the second interface 222 in sequence; when it is necessary to input hydraulic oil into the rod chamber 401, the first interface 221 and the third interface 223 are connected, and the hydraulic oil in the oil tank 21 can enter the rod chamber 401 after passing through the first interface 221 and the third interface 223 in sequence; when the rod chamber 401 needs to drain oil, the third interface 223 and the fourth interface 224 are connected, and the hydraulic oil in the rod chamber 401 returns to the oil tank 21 after passing through the third interface 223 and the fourth interface 224 in sequence. This arrangement can streamline the structure, reduce unnecessary piping arrangements, reduce the probability of failure, and improve safety during use.

[0048] Furthermore, the oil supply unit 20 also includes a third control valve 23, which is disposed on the pipeline between the second interface 222 and the rodless cavity 402. Specifically, in this embodiment, since the oil supply unit 20 needs to input hydraulic oil into the rodless cavity 402 when the mold is first opened, the third control valve 23 is provided to facilitate its control and improve safety during use.

[0049] Furthermore, the oil supply unit 20 also includes a power assembly, which is arranged on the pipeline between the oil tank 21 and the first interface 221. Specifically, in this embodiment, the power assembly includes an oil pump 24, which pumps out the hydraulic oil in the oil tank 21 and delivers it to ensure that the pressure of the hydraulic oil meets the use requirements.

[0050] Furthermore, the oil supply unit 20 further includes a filling pipeline 251 and a filling valve 25, one end of the filling pipeline 251 is connected to the pipeline between the power assembly and the first interface 221, the other end of the filling pipeline 251 is connected to the energy storage tank 11, and the filling valve 25 is arranged on the filling pipeline 251. Specifically, in this embodiment, when the pressure in the energy storage tank 11 is insufficient, the filling valve 25 is opened, and the oil pump 24 is opened at the same time, and the hydraulic oil in the oil tank 21 passes through the oil pump 24 and the filling valve 25 in sequence and enters the energy storage tank 11, so as to ensure that the pressure of the energy storage tank 11 is within a preset range and ensure normal mold opening.

[0051] Furthermore, the oil supply unit 20 further includes an overflow valve 26 and an overflow pipeline 261, one end of the overflow pipeline 261 is connected to the pipeline between the power assembly and the first interface 221, the other end of the overflow pipeline 261 is connected to the oil tank 21, and the overflow valve 26 is arranged on the overflow pipeline 261. Specifically, in this embodiment, the overflow valve 26 can adjust the pressure of the hydraulic oil in the oil circuit to ensure that the oil supply unit 20 can operate stably under a specific pressure, and automatically open when the pressure in the oil circuit exceeds the set value to prevent the oil circuit from being overloaded.

[0052] like Figure 1 As shown, the present embodiment further discloses an injection molding machine 1, which includes a static mold plate 2, a dynamic mold plate 3, a hydraulic cylinder 4 and the above-mentioned energy storage device. The static mold plate 2 and the dynamic mold plate 3 are arranged in sequence along the height direction. The cylinder body of the hydraulic cylinder 4 is fixedly arranged on the static mold plate 2, and the telescopic rod 403 of the hydraulic cylinder 4 is fixedly arranged on the dynamic mold plate 3. The hydraulic cylinder 4 telescopes to drive the dynamic mold plate 3 to move closer to or away from the static mold plate 2. The hydraulic cylinder 4 has a rodless cavity 402 and a rod cavity 401. The energy storage tank 11 of the energy storage device can be connected to the rodless cavity 402, the oil tank 21 of the energy storage device can be connected to the rodless cavity 402, and the oil tank 21 can be connected to the rod cavity 401.

[0053] Specifically, in this embodiment, when the injection molding machine 1 is closing the film, the oil tank 21 can input hydraulic oil into the rod cavity 401, so that the telescopic rod 403 retracts. The retraction of the telescopic rod 403 can push the hydraulic oil in the rodless cavity 402 into the energy storage tank 11 of the energy storage device, so that the gravitational potential energy of the dynamic template 3 and the pressure energy of the hydraulic oil can be stored in the energy storage tank 11; when opening the mold, the hydraulic oil in the energy storage tank 11 can enter the rodless cavity 402, so that the telescopic rod 403 extends, and the stored energy is converted into the gravitational potential energy of the dynamic template 3, completing the mold opening. This injection molding machine 1 improves energy utilization, reduces energy consumption, and achieves energy conservation and emission reduction by being provided with the energy storage device.

[0054] In this embodiment, the injection molding machine 1 also includes a guide rod 5, one end of which is fixedly arranged on the static template 2, and a guide hole is opened on the dynamic template 3, and the guide rod 5 is passed through the guide hole. Specifically, there are multiple guide rods 5 and guide holes, and the multiple guide rods 5 are passed through the multiple guide holes in a one-to-one correspondence. This arrangement can provide guidance for the dynamic template 3, improve the relative position of the dynamic template 3 and the static template 2, and thus ensure product quality.

[0055] like Figure 3 As shown, this embodiment also discloses a working method, which is applicable to the above-mentioned injection molding machine 1, and the working method includes the following steps.

[0056] S10, judging whether the injection molding machine 1 needs to close the mold, if so, entering S20.

[0057] Specifically, in this embodiment, it is determined whether the injection molding machine 1 needs to be molded according to actual use, and if so, S20 is executed.

[0058] S20, the first control valve 12 is opened, the oil supply unit 20 inputs hydraulic oil into the rod chamber 401, the hydraulic oil in the rodless chamber 402 enters the energy storage tank 11 under the push of the hydraulic oil in the rod chamber 401, the energy storage tank 11 stores energy, and after the dynamic template 3 and the static template 2 are abutted, the first control valve 12 is closed.

[0059] Specifically, in this embodiment, when the mold is closed, the first control valve 12 is opened, the first interface 221 and the third interface 223 of the second control valve 22 are connected, the oil pump 24 is turned on, and the hydraulic oil in the oil tank 21 passes through the oil pump 24, the first interface 221 and the third interface 223 in sequence and enters the rod chamber 401. The pressure of the hydraulic oil in the rod chamber 401 increases, pushing the telescopic rod 403 to retract, and the telescopic rod 403 pushes the hydraulic oil in the rodless chamber 402 to pass through the first control valve 12 and enter the energy storage tank 11 to store energy, until the dynamic template 3 and the static template 2 are abutted to complete the mold closing, and the first control valve 12 is closed.

[0060] S30, judging whether the injection molding machine 1 needs to open the mold, if so, proceeding to S40.

[0061] After the mold is closed, injection molding is required. After the injection molding is completed, it is determined whether the next mold opening is required. If it is determined that the mold opening is required, S40 is executed.

[0062] S40, the first control valve 12 is opened, the hydraulic oil in the energy storage tank 11 enters the rodless chamber 402, the energy storage tank 11 releases energy, and the movable template 3 rises.

[0063] Specifically, in this embodiment, when the next mold opening is performed, the third interface 223 and the fourth interface 224 of the second control valve 22 are connected, the oil pump 24 is closed, and the hydraulic oil in the rod chamber 401 of the hydraulic cylinder 4 passes through the third interface 223 and the fourth interface 224 in sequence and returns to the oil tank 21, the first control valve 12 is opened, and the hydraulic oil in the energy storage tank 11 enters the rodless chamber 402 after passing through the first control valve 12. The pressure of the hydraulic oil in the rodless chamber 402 increases, pushing the telescopic rod 403 to extend, driving the movable template 3 to rise, until the movable template 3 reaches the preset position, completing this mold opening.

[0064] Specifically, considering the first mold opening of the injection molding machine 1 , the following steps are provided before step S10 .

[0065] S1. Determine whether the injection molding machine 1 needs to open the mold. If so, enter S2.

[0066] Specifically, in this embodiment, this process is mainly to determine whether the injection molding machine 1 needs to open the mold.

[0067] S2. Determine whether the injection molding machine 1 is opening the mold for the first time. If so, proceed to S3.

[0068] Specifically, in this embodiment, if the injection molding machine 1 opens the mold for the first time, the energy storage tank 11 is not in the energy storage state, and the oil supply unit 20 is required to supply oil to the rodless cavity 402 to ensure normal mold opening of the injection molding machine 1.

[0069] S3, the oil supply unit 20 inputs hydraulic oil into the rodless chamber 402 to raise the movable platen 3. After the movable platen 3 reaches the preset position, the oil supply unit 20 stops working.

[0070] Specifically, in the present embodiment, when the mold is opened for the first time, the first control valve 12 is closed, the third control valve 23 is opened, the first interface 221 and the second interface 222 of the second control valve 22 are connected, the third interface 223 and the fourth interface 224 of the second control valve 22 are connected, the oil pump 24 is turned on, and the hydraulic oil in the oil tank 21 passes through the oil pump 24, the first interface 221 and the second interface 222 in sequence and enters the rodless cavity 402. The pressure of the hydraulic oil in the rodless cavity 402 increases, the rod cavity 401 is discharged, and the hydraulic oil in the rodless cavity 402 pushes the telescopic rod 403 to extend, thereby driving the movable template 3 to move upward. After the movable template 3 reaches the preset position, the third control valve 23 is closed, the oil pump 24 is closed, and the mold opening is completed.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An energy storage device for storing energy in an injection molding machine (1), wherein the injection molding machine (1) comprises a static mold plate (2), a dynamic mold plate (3) and a hydraulic cylinder (4), wherein a cylinder body of the hydraulic cylinder (4) is fixedly mounted on the static mold plate (2), a telescopic rod (403) of the hydraulic cylinder (4) is fixedly mounted on the dynamic mold plate (3), and the hydraulic cylinder (4) has a rodless cavity (402) and a rod cavity (401), characterized in that: The energy storage device comprises: An energy storage unit (10), the energy storage unit (10) comprising an energy storage tank (11) and a first control valve (12), the energy storage tank (11) being capable of communicating with the rodless chamber (402), the first control valve (12) being arranged on a pipeline between the energy storage tank (11) and the rodless chamber (402); An oil supply unit (20), the oil supply unit (20) comprising an oil tank (21), the oil tank (21) being capable of communicating with the rodless chamber (402), the oil tank (21) being capable of communicating with the rod chamber (401), and the oil supply unit (20) having a first state, a second state and an oil return state, when the oil supply unit (20) is in the first state, the oil supply unit (20) supplies oil to the rodless chamber (402), when the oil supply unit (20) is in the second state, the oil supply unit (20) supplies oil to the rod chamber (401), and when the oil supply unit (20) is in the oil return state, the hydraulic oil in the rod chamber (401) returns to the oil tank (21).

2. The energy storage device according to claim 1, characterized in that: The energy storage unit (10) further comprises a pressure detection component, wherein the pressure detection component is arranged on the energy storage tank (11).

3. The energy storage device according to claim 1, characterized in that: The energy storage unit (10) further comprises a safety valve (16), wherein the safety valve (16) is arranged between the energy storage tank (11) and the oil tank (21).

4. The energy storage device according to claim 1, characterized in that: The oil supply unit (20) also includes a second control valve (22), the second control valve (22) having a first interface (221), a second interface (222), a third interface (223) and a fourth interface (224), the first interface (221) and the fourth interface (224) are both connected to the oil tank (21), the second interface (222) is connected to the rodless chamber (402), and the third interface (223) is connected to the rod chamber (401), when the oil supply unit (20) is in the first state, the first interface (221) and the second interface (222) are connected; when the oil supply unit (20) is in the second state, the first interface (221) and the third interface (223) are connected, and when the oil supply unit (20) is in the oil return state, the third interface (223) and the fourth interface (224) are connected.

5. The energy storage device according to claim 4, characterized in that: The oil supply unit (20) further comprises a third control valve (23), and the third control valve (23) is arranged on the pipeline between the second interface (222) and the rodless chamber (402).

6. The energy storage device according to claim 4, characterized in that: The oil supply unit (20) further comprises a power assembly, wherein the power assembly is arranged on a pipeline between the oil tank (21) and the first interface (221).

7. The energy storage device according to claim 6, characterized in that: The oil supply unit (20) further comprises a liquid filling pipeline (251) and a liquid filling valve (25); one end of the liquid filling pipeline (251) is connected to the pipeline between the power assembly and the first interface (221); the other end of the liquid filling pipeline (251) is connected to the energy storage tank (11); and the liquid filling valve (25) is arranged on the liquid filling pipeline (251).

8. The energy storage device according to claim 7, characterized in that: The oil supply unit (20) further comprises an overflow valve (26) and an overflow pipeline (261), one end of the overflow pipeline (261) being connected to the pipeline between the power assembly and the first interface (221), the other end of the overflow pipeline (261) being connected to the oil tank (21), and the overflow valve (26) being arranged on the overflow pipeline (261).

9. An injection molding machine (1), comprising a static mold plate (2), a movable mold plate (3) and a hydraulic cylinder (4), characterized in that: The injection molding machine (1) further comprises an energy storage device as claimed in any one of claims 1 to 8, wherein the static mold plate (2) and the dynamic mold plate (3) are arranged in sequence along the height direction, the cylinder body of the hydraulic cylinder (4) is fixedly arranged on the static mold plate (2), the telescopic rod (403) of the hydraulic cylinder (4) is fixedly arranged on the dynamic mold plate (3), the hydraulic cylinder (4) telescopes to drive the dynamic mold plate (3) to approach or move away from the static mold plate (2), the hydraulic cylinder (4) has a rodless cavity (402) and a rod cavity (401), the energy storage tank (11) of the energy storage device can be communicated with the rodless cavity (402), the oil tank (21) of the energy storage device can be communicated with the rodless cavity (402), and the oil tank (21) can be communicated with the rod cavity (401).

10. A working method, said working method being applicable to the injection molding machine (1) according to claim 9, characterized in that: The working method comprises: S10, determining whether the injection molding machine (1) needs to close the mold, and if so, proceeding to S20; S20, the first control valve (12) is opened, the oil supply unit (20) inputs hydraulic oil into the rod chamber (401), the hydraulic oil in the rodless chamber (402) enters the energy storage tank (11) under the push of the hydraulic oil in the rod chamber (401), the energy storage tank (11) stores energy, and after the movable plate (3) and the static plate (2) are in contact, the first control valve (12) is closed; S30, determining whether the injection molding machine (1) needs to open the mold, if so, proceeding to S40; S40, the first control valve (12) is opened, the hydraulic oil in the energy storage tank (11) enters the rodless chamber (402), the energy storage tank (11) releases energy, and the movable platen (3) rises.

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