Energy storage device and injection molding machine

Abstract

The utility model belongs to the technical field of energy recycling of vertical injection molding machines, and discloses an energy storage device and an 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] This utility model relates to the field of energy recovery and utilization technology for vertical injection molding machines, and particularly to energy storage devices and injection molding machines. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. Injection molding machines are mainly divided into vertical injection molding machines, horizontal injection molding machines, and all-electric injection molding machines. They consist of an injection system, a mold clamping system, a hydraulic transmission system, an electrical control system, a lubrication system, a heating and cooling system, and a safety monitoring system. The mold clamping system ensures the mold closes, opens, and ejects the product. For vertical injection molding machines, the mold clamping system typically includes a hydraulic cylinder. The cylinder body is fixedly installed on the stationary mold platen, and the cylinder's extension rod is fixedly installed on the moving mold platen. The hydraulic transmission system inputs or outputs hydraulic oil to the cylinder, causing the extension rod to extend or retract, thus moving the moving mold platen up and down. However, when the moving mold platen moves downward, the gravitational potential energy of the moving mold platen 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 and an injection molding machine are needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide an energy storage device and an injection molding machine. This energy storage device can store the gravitational potential energy and hydraulic energy generated during the downward movement of the moving platen when the injection molding machine is closing the mold. The stored gravitational potential energy and hydraulic energy can be effectively utilized in the next mold opening, thereby improving the energy utilization rate of the injection molding machine, reducing the total energy consumption of the injection molding machine, and reducing energy waste.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An energy storage device for storing energy in an injection molding machine, the injection molding machine including a stationary platen, a moving platen, and a hydraulic cylinder, the cylinder body of the hydraulic cylinder being fixedly installed on the stationary platen, the telescopic rod of the hydraulic cylinder being fixedly installed on the moving platen, and the hydraulic cylinder having a rodless chamber and a rod-type chamber, the energy storage device comprising:

[0007] An energy storage unit, comprising an energy storage tank and a first control valve, wherein the energy storage tank is connected to the rodless cavity, and the first control valve is disposed on a pipeline between the energy storage tank and the rodless cavity;

[0008] The oil supply unit includes an oil tank that is connected to the rodless cavity and the rod cavity. The oil supply unit has a first state, a second state, and a return state. When the oil supply unit is in the first state, it supplies oil to the rodless cavity. When the oil supply unit is in the second state, it supplies oil to the rod cavity. When the oil supply unit is in the return state, the hydraulic oil in the rod cavity returns to the oil tank.

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

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

[0011] As an optional technical solution, the oil supply unit further includes a second control valve, which has 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, which is disposed 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 component, which is disposed on the pipeline between the oil tank and the first interface.

[0014] As an optional technical solution, the oil supply unit further 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, and the other end of the filling pipeline is connected to the energy storage tank. The filling valve is disposed on the filling pipeline.

[0015] As an optional technical solution, the oil supply unit further 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. The overflow valve is disposed in the overflow pipeline.

[0016] This utility model also adopts the following technical solution:

[0017] The injection molding machine includes a stationary platen, a moving platen, and a hydraulic cylinder. It also includes the aforementioned energy storage device. The stationary platen and the moving platen are arranged sequentially along their height. The cylinder body of the hydraulic cylinder is fixedly mounted on the stationary platen, and the telescopic rod of the hydraulic cylinder is fixedly mounted on the moving platen. The extension and retraction of the hydraulic cylinder causes the moving platen to move closer to or further away from the stationary platen. The hydraulic cylinder has a rodless chamber and a rod chamber. The energy storage tank of the energy storage device is connected to the rodless chamber, and the oil tank of the energy storage device is connected to both the rodless chamber and the rod chamber.

[0018] As an optional technical solution, the injection molding machine also includes a guide rod, one end of which is fixedly disposed on the stationary template, and a guide hole is provided on the moving template, through which the guide rod passes.

[0019] The beneficial effects of this utility model are:

[0020] This utility model discloses an energy storage device for use in injection molding machines. The energy storage device includes an energy storage unit and an oil supply unit. The energy storage unit includes an energy storage tank and a first control valve. The oil supply unit includes an oil tank. The energy storage tank and the first control valve are connected. The first control valve is connected to the rodless chamber of the hydraulic cylinder of the injection molding machine. The oil tank can selectively connect to or not connect to the rodless chamber and the rod chamber of the hydraulic cylinder. When the mold is closed, the oil supply unit supplies oil to the rod chamber, which increases the pressure in the rod chamber. At this time, the first control valve opens, and the hydraulic oil in the rodless chamber enters the energy storage tank after passing through the first control valve, thereby storing the gravitational potential energy and hydraulic energy of the moving mold plate. When the mold is opened, the oil in the rod chamber is discharged, the first control valve opens, and the high-pressure hydraulic oil in the energy storage tank enters the rodless chamber to lift the moving mold plate and complete the mold opening operation. This energy storage device can effectively store the gravitational potential energy and hydraulic energy of the moving mold plate into 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.

[0021] This utility model also discloses an injection molding machine, which includes a stationary mold plate, a moving mold plate, and a hydraulic cylinder, as well as the aforementioned energy storage device. The energy storage tank of the energy storage device can be connected to the rodless cavity, and 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 moving mold plate during mold closing, improving the energy utilization rate of the injection molding machine. 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. Attached Figure Description

[0022] Figure 1 This is a partial structural schematic diagram of the injection molding machine according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the second control valve in an embodiment of this utility model.

[0024] In the picture:

[0025] 1. Injection molding machine; 2. Stationary mold plate; 3. Moving mold plate; 4. Hydraulic cylinder; 401. Rod-mounted cavity; 402. Rodless cavity; 403. Telescopic rod; 5. Guide rod;

[0026] 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;

[0027] 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 Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] like Figure 1 and Figure 2 As shown, this embodiment provides an energy storage device, 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 communicate with the rodless chamber 402. The first control valve 12 is disposed 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 communicate with the rodless chamber 402 and the rod chamber 401. The oil supply unit 20 has a first state, a second state, and a 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 return state, the hydraulic oil in the rod chamber 401 returns to the oil tank 21.

[0033] Specifically, in this embodiment, a first control valve 12 is installed on the pipeline between the energy storage tank 11 and the rodless chamber 402. The first control valve 12 can control the opening and closing 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, improving the flexibility of use, and facilitating personnel control. The oil tank 21 can be connected to the rodless chamber 402. This arrangement allows the injection molding machine 1 to open the mold normally when the energy storage device cannot perform its normal function, ensuring the normal use of the injection molding machine 1 and the normal production of products. In this embodiment, the inability of the energy storage device to perform its normal function includes two situations: 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, so the energy storage device does not have the conditions for energy storage; the other is that the energy storage device cannot perform energy storage normally when it malfunctions. In both of these situations, the oil supply unit 20 needs to be in the first state, and the oil tank 21 needs to supply 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 moving platen 3 can rise and fall normally, so as to ensure the normal operation of the injection molding machine 1 and improve the injection molding machine's ability to cope with risks. When the oil tank 21 is connected to the rod cavity 401, only when the oil supply unit 20 is in the second state can the oil tank 21 be guaranteed to normally input hydraulic oil into the rod cavity 401. This ensures the normal downward movement of the moving platen 3, thereby ensuring the normal mold closing of the injection molding machine 1 and the normal operation of the injection molding machine 1. It also allows the hydraulic oil in the rodless cavity 402 to normally enter the energy storage tank 11 for energy storage, thereby ensuring that the energy storage tank 11 can normally supply high-pressure hydraulic oil to the rodless cavity 402 during the next mold opening, 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 return oil state, the hydraulic oil in the rod chamber 401 will flow back to the oil tank 21. This setting ensures that when the energy storage tank 11 outputs hydraulic oil to the rodless chamber 402, the rod chamber 401 is in a low-pressure state, which can minimize the energy loss caused by the energy released by the energy storage tank 11 having 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 platen 3, and thus ensuring the normal function of the injection molding machine 1.

[0034] Furthermore, the energy storage unit 10 also includes a pressure detection component, which is disposed in the energy storage tank 11. Specifically, in this embodiment, the pressure detection component includes a pressure gauge 13, which is connected to the energy storage tank 11 via a pipeline. 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 risks caused by excessive pressure in the energy storage tank 11 and ensuring safety during use. At the same time, when the value of the pressure gauge 13 is lower than the preset pressure range of the energy storage tank 11, the operator can also replenish hydraulic oil to the energy storage tank 11 in a timely manner 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.

[0035] Specifically, in this embodiment, the pressure detection component further includes a pressure sensor 14, which is connected to the energy storage tank 11 via a pipeline and can monitor the pressure of the hydraulic oil in the energy storage tank 11 in real time. Furthermore, for ease of 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, and the pressure sensor 14 feeds back the pressure value of the energy storage tank 11 to the control component. The control component then displays the real-time pressure value on the display screen, allowing personnel to obtain the pressure value of the energy storage tank 11 in real time, thereby ensuring safety during use.

[0036] Furthermore, in this embodiment, the energy storage unit 10 also includes a safety valve 16, which is disposed between the energy storage tank 11 and the oil tank 21. When the pressure in the energy storage tank 11 is too high, the safety valve 16 can discharge part of the hydraulic oil in the energy storage tank 11 into the oil tank 21, thereby further ensuring safety during use.

[0037] Optionally, in this 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 the preset range of the pressure value of the energy storage tank 11, the control component can control the safety valve 16 to open, thereby allowing some 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.

[0038] Optionally, the energy storage unit 10 also includes a pressure relief valve 15, which is also located between the energy storage tank 11 and the oil tank 21. Specifically, in this embodiment, when the energy storage tank 11 malfunctions and needs to be replaced or repaired, opening the pressure relief valve 15 allows some of the hydraulic oil in the energy storage tank 11 to 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, preventing injury to personnel. Furthermore, in this embodiment, the pressure relief valve 15 remains closed during the energy storage or release process of the energy storage tank 11 to ensure that the energy storage tank 11 does not depressurize. Otherwise, insufficient pressure in the energy storage tank 11 could lead to problems such as inability to open the mold or inability to pressurize the energy storage tank 11. Therefore, the pressure relief valve 15 is only used when the energy storage tank 11 needs repair, replacement, or pressure relief.

[0039] Specifically, in this embodiment, the energy storage unit 10 further includes a switching valve 17, which is disposed between the energy storage tank 11 and the first control valve 12 to further ensure safe use.

[0040] Further, 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 hydraulic oil needs to be input 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 hydraulic oil needs to be input 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 discharge 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 setting can simplify the structure, reduce unnecessary pipeline layout, reduce the probability of failure, and improve safety during use.

[0041] 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 during the initial mold opening, the third control valve 23 facilitates its control and improves safety during use.

[0042] Furthermore, the oil supply unit 20 also includes a power assembly, which is located 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 draws hydraulic oil from the oil tank 21 and delivers it to ensure that the pressure of the hydraulic oil meets the usage requirements.

[0043] Furthermore, the oil supply unit 20 also 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 component and the first interface 221, and the other end of the filling pipeline 251 is connected to the energy storage tank 11. The filling valve 25 is disposed on the filling pipeline 251. Specifically, in this embodiment, when the pressure in the energy storage tank 11 is insufficient, the filling valve 25 opens, and at the same time, the oil pump 24 opens. The hydraulic oil in the oil tank 21 enters the energy storage tank 11 after passing through the oil pump 24 and the filling valve 25 in sequence, so as to ensure that the pressure in the energy storage tank 11 is within the preset range and to ensure normal mold opening.

[0044] Furthermore, the oil supply unit 20 also includes an overflow valve 26 and an overflow pipe 261. One end of the overflow pipe 261 is connected to the pipeline between the power component and the first interface 221, and the other end of the overflow pipe 261 is connected to the oil tank 21. The overflow valve 26 is disposed in the overflow pipe 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. When the pressure in the oil circuit exceeds the set value, it automatically opens to prevent oil circuit overload.

[0045] like Figure 1 As shown, this embodiment also discloses an injection molding machine 1, which includes a stationary template 2, a moving template 3, a hydraulic cylinder 4, and the aforementioned energy storage device. The stationary template 2 and the moving template 3 are arranged sequentially along the height direction. The cylinder body of the hydraulic cylinder 4 is fixedly installed on the stationary template 2, and the telescopic rod 403 of the hydraulic cylinder 4 is fixedly installed on the moving template 3. The extension and retraction of the hydraulic cylinder 4 causes the moving template 3 to move closer to or away from the stationary template 2. The hydraulic cylinder 4 has a rodless chamber 402 and a rod chamber 401. The energy storage tank 11 of the energy storage device can communicate with the rodless chamber 402, and the oil tank 21 of the energy storage device can communicate with the rodless chamber 402 and the oil tank 21 can communicate with the rod chamber 401.

[0046] Specifically, in this embodiment, when the injection molding machine 1 closes the mold, the oil tank 21 can input hydraulic oil into the rod chamber 401, causing the telescopic rod 403 to retract. The retraction of the telescopic rod 403 can push the hydraulic oil in the rodless chamber 402 into the energy storage tank 11 of the energy storage device, thereby allowing the gravitational potential energy of the moving mold plate 3 and the pressure energy of the hydraulic oil to 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 chamber 402, causing the telescopic rod 403 to extend, converting the stored energy back into the gravitational potential energy of the moving mold plate 3, completing the mold opening. This injection molding machine 1, by incorporating this energy storage device, improves energy utilization, reduces energy consumption, and achieves energy conservation and emission reduction.

[0047] Furthermore, the injection molding machine 1 also includes guide rods 5. One end of the guide rod 5 is fixedly mounted on the stationary template 2, and a guide hole is provided on the moving template 3, through which the guide rod 5 passes. Specifically, in this embodiment, multiple guide rods 5 and guide holes are provided, with multiple guide rods 5 correspondingly passing through multiple guide holes. This arrangement can guide the moving template 3, improve the relative position of the moving template 3 and the stationary template 2, and thus ensure product quality.

[0048] The working process of the injection molding machine 1 in this embodiment is described in detail below. First, when the injection molding machine 1 is used for the first time, the energy storage tank 11 is not in the energy storage state. Therefore, the oil supply unit 20 needs to supply oil to the rodless chamber 402 of the hydraulic cylinder 4. So 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 enters the rodless chamber 402 after passing through the oil pump 24, the first interface 221 and the second interface 222 in sequence. The pressure of the hydraulic oil in the rodless chamber 402 increases, the rod chamber 401 discharges oil, and the hydraulic oil in the rodless chamber 402 pushes the telescopic rod 403 to extend, thereby driving the moving platen 3 to move upward. After the moving platen 3 reaches the preset position, the third control valve 23 is closed, the oil pump 24 is turned off, and the mold opening is completed. When the mold closing is required, the first control valve 22 is closed, the third control valve 23 is closed, the third control valve 24 is turned off, and the third control valve 23 is turned on. When valve 12 is opened, hydraulic oil is supplied to the rod chamber 401 by the oil supply unit 20. 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. After the moving template 3 and the stationary template 2 come into contact, the first control valve 12 closes, completing the mold closing and energy storage in the energy storage tank at this time. When the mold is opened for the next time, the third port 223 and the fourth port 224 of the second control valve 22 are connected, the oil pump 24 is turned off, and the hydraulic oil in the rod chamber 401 of the hydraulic cylinder 4 returns to the oil tank 21 after passing through the third port 223 and the fourth port 224 in sequence. 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 and driving the moving template 3 to rise until the moving template 3 reaches the preset position, completing this mold opening.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An energy storage device for storing energy in an injection molding machine (1), the injection molding machine (1) comprising a stationary template (2), a moving template (3), and a hydraulic cylinder (4), wherein the cylinder body of the hydraulic cylinder (4) is fixedly installed on the stationary template (2), the telescopic rod (403) of the hydraulic cylinder (4) is fixedly installed on the moving template (3), and the hydraulic cylinder (4) has a rodless chamber (402) and a rod chamber (401), characterized in that, The energy storage device includes: An energy storage unit (10) includes an energy storage tank (11) and a first control valve (12). The energy storage tank (11) is connected to the rodless chamber (402). The first control valve (12) is located on the pipeline between the energy storage tank (11) and the rodless chamber (402). The oil supply unit (20) includes an oil tank (21), which is connected to the rodless cavity (402) and the rod cavity (401). The oil supply unit (20) has a first state, a second state, and a return state. When the oil supply unit (20) is in the first state, it supplies oil to the rodless cavity (402). When the oil supply unit (20) is in the second state, it supplies oil to the rod cavity (401). When the oil supply unit (20) is in the return state, the hydraulic oil in the rod cavity (401) returns to the oil tank (21).

2. The energy storage device according to claim 1, characterized in that, The energy storage unit (10) also includes a pressure detection component, which is disposed in the energy storage tank (11).

3. The energy storage device according to claim 1, characterized in that, The energy storage unit (10) also includes a safety valve (16), which is located 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) further 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.

5. The energy storage device according to claim 4, characterized in that, 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 chamber (402).

6. The energy storage device according to claim 4, characterized in that, The oil supply unit (20) also includes a power component, which is disposed on the 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 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 component and the first interface (221), and the other end of the filling pipeline (251) is connected to the energy storage tank (11). The filling valve (25) is disposed on the filling pipeline (251).

8. The energy storage device according to claim 7, characterized in that, The oil supply unit (20) also 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), and the other end of the overflow pipeline (261) is connected to the oil tank (21). The overflow valve (26) is located in the overflow pipeline (261).

9. An injection molding machine, said injection molding machine (1) comprising a stationary mold plate (2), a moving mold plate (3), and a hydraulic cylinder (4), characterized in that, The injection molding machine (1) further includes an energy storage device as described in any one of claims 1-8, wherein the stationary template (2) and the moving template (3) are arranged sequentially along the height direction, the cylinder body of the hydraulic cylinder (4) is fixedly arranged on the stationary template (2), the telescopic rod (403) of the hydraulic cylinder (4) is fixedly arranged on the moving template (3), the hydraulic cylinder (4) extends and retracts to drive the moving template (3) to approach or move away from the stationary template (2), the hydraulic cylinder (4) has a rodless chamber (402) and a rod chamber (401), the energy storage tank (11) of the energy storage device can communicate with the rodless chamber (402), the oil tank (21) of the energy storage device can communicate with the rodless chamber (402), and the oil tank (21) can communicate with the rod chamber (401).

10. The injection molding machine according to claim 9, characterized in that, The injection molding machine (1) also includes a guide rod (5), one end of which is fixedly mounted on the stationary template (2), and a guide hole is provided on the moving template (3), through which the guide rod (5) passes.

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