Injection system and die casting machine

Abstract

The utility model discloses an injection system and a die casting machine. The injection system comprises an injection oil cylinder, a high-pressure energy accumulator, a pressurizing mechanism and a valve module; the valve module is used for connecting a rodless cavity of the injection oil cylinder with the high-pressure energy accumulator through an oil path, so that the high-pressure energy accumulator directly supplies oil to the rodless cavity of the injection oil cylinder through the valve module during pressurized injection; the pressurizing mechanism is connected with the high-pressure energy accumulator through the valve module so as to store energy for the high-pressure energy accumulator. The die casting machine comprises the injection system. The pressurizing injection device has the beneficial effects that compared with a traditional mode that a pressurizing oil cylinder is adopted for pressurizing injection, the pressurizing injection device can be provided with the high-pressure energy accumulator and directly act on the rodless cavity of the injection oil cylinder, so that the pressure building stability can be greatly improved during pressurizing injection, and the pressure building time is greatly shortened.

Description

Technical Field

[0001] The present application relates to the technical field of metal die-casting, and in particular to a die-casting system and a die-casting machine. Background Art

[0002] A die-casting machine is a machine used for pressure casting, and is commonly used in the production and processing of automotive parts. Under the action of pressure, the die-casting machine can hydraulically inject molten metal into the mold for cooling and forming, and a solid metal casting can be obtained after the mold is opened. At present, the boosting principle of most die-casting machines generally has two boosting methods: one is an accumulator with an external boosting cylinder or boosting piston; the other is an accumulator with an internal integrated boosting plunger.

[0003] For the accumulator external booster cylinder or booster piston, the one-way valve is mainly used to close the oil inlet channel of the rapid injection, so that the injection chamber forms a closed space. The way of boosting is to compress the hydraulic oil through the booster piston to achieve the purpose of boosting. However, in the process of closing the one-way valve, the hydraulic oil has a certain impact, and the movement of the spring and the valve core will waste a certain amount of time. Therefore, the closing time of the one-way valve is uncertain, which will directly affect the pressure building stability of the injection system. At the same time, the booster plunger is integrated inside the accumulator. Since the small chamber hydraulic oil needs to be released during the boosting, it will also affect the pressure building stability of the injection system. Therefore, it is urgent to improve the existing injection system. Utility Model Content

[0004] One of the objectives of the present application is to provide an injection system that can solve at least one of the defects in the above-mentioned background technology.

[0005] Another object of the present application is to provide a die-casting machine that can solve at least one of the defects in the above-mentioned background technology.

[0006] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: an injection system, including an injection cylinder, a high-pressure accumulator, a boosting mechanism and a valve module; the valve module connects the rodless chamber of the injection cylinder with the high-pressure accumulator through an oil circuit, so that when boosting injection is performed, the high-pressure accumulator directly supplies oil to the rodless chamber of the injection cylinder through the valve module; the boosting mechanism is connected to the high-pressure accumulator through the valve module for storing energy in the high-pressure accumulator.

[0007] Preferably, the valve module includes a control valve V1, which connects the high-pressure accumulator with the rodless chamber of the injection cylinder through an oil circuit, and further controls the conduction between the high-pressure accumulator and the rodless chamber of the injection cylinder through the action of the control valve V1.

[0008] Preferably, the input end of the boosting mechanism is connected to the oil pump through the valve module, and the output end of the boosting mechanism is connected to the high-pressure accumulator through the valve module; the boosting mechanism is suitable for storing energy in the high-pressure accumulator after pressurizing the hydraulic oil pumped into the oil pump.

[0009] Preferably, the boosting mechanism includes a double-acting boosting cylinder; the valve module includes a reversing valve V4 and four one-way valves V5 to V8; the input end of the double-acting boosting cylinder is connected to the oil pump through the reversing valve, and the output end of the double-acting boosting cylinder is connected to the high-pressure accumulator through the boosting oil circuit formed by the one-way valve, so that the double-acting boosting cylinder is controlled by repeated reversing of the reversing valve V4 to input the hydraulic oil into the high-pressure accumulator for energy storage after being pressurized by the boosting oil circuit.

[0010] Preferably, the injection system also includes a low-pressure accumulator; the low-pressure accumulator is connected to the rodless chamber of the injection cylinder through the valve module, so that when rapid injection is performed, the low-pressure accumulator supplies oil to the rodless chamber of the injection cylinder under the control of the valve module.

[0011] Preferably, the valve module comprises a control valve V2, and the low-pressure accumulator is connected to the rodless chamber of the injection cylinder via the control valve V2.

[0012] Preferably, the low-pressure accumulator is also connected to an oil pump via the valve module, so that the oil pump stores energy in the low-pressure accumulator under the control of the valve module.

[0013] Preferably, the valve module includes a control valve V3, and the low-pressure accumulator is connected to the oil pump via the control valve V3.

[0014] Preferably, the oil pump adopts a multi-pump group, and the injection system further includes a servo motor M; the servo motor M is suitable for driving the multi-pump group to supply oil to the oil circuit.

[0015] A die-casting machine comprises the above-mentioned injection system.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] Compared with the traditional method of using a booster cylinder for booster injection, the present application can set a high-pressure accumulator and directly act on the rodless chamber of the injection cylinder, thereby greatly improving the pressure building stability and greatly shortening the pressure building time during booster injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the oil circuit structure of the pressure injection system in the utility model.

[0019] Figure 2 This is an equivalent schematic diagram of the oil circuit when the utility model performs rapid injection.

[0020] Figure 3 It is an equivalent schematic diagram of the oil circuit when the utility model performs pressurized injection.

[0021] Figure 4 This is an equivalent schematic diagram of the oil circuit for storing energy in a low-pressure accumulator according to the utility model.

[0022] Figure 5 The first is an equivalent schematic diagram of the oil circuit for storing energy in the high-pressure accumulator according to the utility model.

[0023] Figure 6 This is a second equivalent schematic diagram of the oil circuit for storing energy in the high-pressure accumulator according to the utility model.

[0024] In the figure: an injection cylinder 100, a double-acting booster cylinder 200, and an oil pump 300. DETAILED DESCRIPTION

[0025] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0028] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0029] One aspect of the present application provides a shot injection system, such as Figure 1 and Figure 3 As shown, one preferred embodiment includes an injection cylinder 100, a high-pressure accumulator ACC1 and a valve module. The valve module connects the rodless chamber of the injection cylinder 100 with the high-pressure accumulator through an oil circuit, so that when performing pressurized injection, the high-pressure accumulator directly supplies oil to the rodless chamber of the injection cylinder 100 through the valve module.

[0030] It should be known that in the traditional shot-shooting system, for the boosting and shooting stage of the shot-shooting cylinder 100, a boosting cylinder is generally used for boosting; that is, the oil pump 300 supplies oil to the boosting cylinder, and then the piston rod of the boosting cylinder can squeeze the hydraulic oil in the rod chamber of the shot-shooting cylinder 100 to achieve boosting. In the traditional shot-shooting system, during the rapid shot before boosting and shooting, the shot-shooting cylinder 100 is generally directly supplied with oil by the oil pump 300, so the traditional shot-shooting system needs to switch the oil circuit when completing the rapid shot and entering the boosting and shooting. During the switching process of the oil circuit, the impact force of the hydraulic oil in the oil circuit will interfere with the opening and closing process of the one-way valve, thereby affecting the pressure building stability of the shot-shooting system.

[0031] In the present embodiment, a high-pressure accumulator ACC1 is provided, and the high-pressure accumulator ACC1 can be connected to the rodless chamber of the injection cylinder 100 through a valve module. When performing pressurized injection, the high-pressure accumulator ACC1 can supply oil to the rodless chamber of the injection cylinder 100 by opening the valve module, thereby pressurizing the rod chamber of the injection cylinder 100. That is, during pressurized injection, the high-pressure accumulator ACC1 acts as a power source to provide pressure for the injection cylinder 100. Since the high-pressure accumulator ACC1 directly acts on the rodless chamber of the injection cylinder 100, there is no switching process of the traditional oil circuit during pressurized injection, thereby effectively improving the pressure building stability of the injection system and shortening the time required for pressure building.

[0032] Specifically, Figure 1 and Figure 3 As shown, the valve module includes a control valve V1, which connects the high-pressure accumulator ACC1 with the rodless chamber of the injection cylinder 100 through an oil circuit. When non-pressurized injection is performed, the control valve V1 can keep the high-pressure accumulator ACC1 and the rodless chamber of the injection cylinder 100 in a cut-off state; while when pressurized injection is performed, the control valve V1 can conduct the high-pressure accumulator ACC1 with the rodless chamber of the injection cylinder 100, and then the hydraulic oil in the high-pressure accumulator ACC1 can enter the rodless chamber of the injection cylinder 100 through the oil circuit along the control valve V1, thereby achieving the required pressurized injection action.

[0033] In this embodiment, Figure 1 , Figure 5 and Figure 6 As shown, the injection system also includes a boosting mechanism; the input end of the boosting mechanism is connected to the oil pump 300 through a valve module, and the output end of the boosting mechanism is connected to the high-pressure accumulator ACC1 through a valve module; the boosting mechanism can boost the hydraulic oil pumped into the oil pump 300 and then store energy in the high-pressure accumulator ACC1.

[0034] It should be known that during the pressurization and injection, the high-pressure accumulator ACC1 needs to continuously provide hydraulic oil to the injection cylinder 100, and after the pressurization and injection is completed, the hydraulic oil in the rodless chamber of the injection cylinder 100 will flow back to the oil tank. That is, as the pressurization and injection of the injection cylinder 100 increases, the hydraulic oil stored in the high-pressure accumulator ACC1 will continue to decrease. When the hydraulic oil in the high-pressure accumulator ACC1 is insufficient, it is necessary to store energy through the pressurization mechanism.

[0035] It should also be known that the energy storage of the high-pressure accumulator ACC1 by the boosting mechanism is generally achieved by a boosting cylinder combined with a corresponding boosting oil circuit. For the boosting cylinder, a single-acting boosting cylinder or a double-acting boosting oil cylinder 200 can be used; in order to facilitate the description of the subsequent content, a double-acting boosting oil cylinder 200 is preferably used for the boosting cylinder in this embodiment. The structure of the double-acting boosting oil cylinder 200 is well known to those skilled in the art. Generally speaking, the double-acting boosting oil cylinder 200 can be regarded as a double-acting cylinder and two single-acting cylinders located at both ends of the double-acting cylinder.

[0036] Specifically, Figure 1 , Figure 5 and Figure 6 As shown, the boost mechanism includes a double-acting boost cylinder 200; the valve module includes a reversing valve V4 and four one-way valves V5 to V8. The two chambers of the double-acting cylinder of the double-acting boost cylinder 200 as the input end are connected to the oil pump 300 through the reversing valve. The two single-acting cylinders of the double-acting boost cylinder 200 as the output end are connected to the high-pressure accumulator ACC1 through the one-way valves V5 and V8 respectively; at the same time, the two chambers of the double-acting cylinder as the output end of the double-acting boost cylinder 200 are connected to the single-acting cylinder on the corresponding side through the one-way valves V6 and V7 respectively. That is, the double-acting boost cylinder 200 and the high-pressure accumulator ACC1 can form a boost oil circuit through the connection of the one-way valves V5 to V8; so that when the high-pressure accumulator ACC1 is accumulating energy, the double-acting boost cylinder 200 can be controlled by the repeated reversing of the reversing valve V4 to input the hydraulic oil into the high-pressure accumulator for energy storage after being pressurized by the boost oil circuit.

[0037] For ease of understanding, the energy storage process of the high-pressure accumulator ACC1 is described in detail below in conjunction with a specific equivalent oil circuit, wherein the two cavities of the double-acting cylinder are defined as a left cavity and a right cavity, respectively, and the two single-acting cylinders are defined as a left cylinder and a right cylinder, respectively.

[0038] like Figure 5 As shown, the reversing valve V4 controls the oil pump 300 and the oil tank to communicate with the left cavity and the right cavity respectively. Then the oil pump 300 can pump hydraulic oil into the left cavity. At this time, the conduction direction of the one-way valve V6 is the same as the flow direction of the hydraulic oil, and then the one-way valve V6 will open, so that part of the hydraulic oil pumped by the oil pump 300 can enter the left working cylinder along the one-way valve V6. At this time, the increased pressure in the left cavity of the double-acting booster cylinder 200 will push the piston rod to move to the right, so that the hydraulic oil in the equivalent right cavity of the double-acting booster cylinder 200 flows back to the oil tank along the reversing valve V4, and the hydraulic oil in the right working cylinder can open the one-way valve V8 and flow into the high-pressure accumulator ACC1 for energy storage.

[0039] like Figure 6 As shown, when the piston rod of the double-acting booster pump 200 moves to the right limit position, the reversing valve V4 is reversed to connect the left and right chambers of the double-acting booster oil cylinder 200 with the oil tank and the oil pump 300 respectively, and then the oil pump 300 can pump the hydraulic oil into the right chamber. At this time, the conduction direction of the one-way valve V7 is the same as the flow direction of the hydraulic oil, and then the one-way valve V7 will open, so that the hydraulic oil pumped by the oil pump 300 can enter the right cylinder along the one-way valve V7. At this time, the pressure increase in the right chamber of the double-acting booster oil cylinder 200 will push the piston rod to move to the left, so that the hydraulic oil in the equivalent left chamber of the double-acting booster oil cylinder 200 flows back to the oil tank along the reversing valve V4, and the hydraulic oil in the left cylinder flows into the high-pressure accumulator ACC1 along the opened one-way valve V5 for energy storage.

[0040] It should be known that when the high-pressure accumulator ACC1 is storing energy, the above two processes will be implemented cyclically through repeated reversal of the reversing valve V4, and the pressure of the high-pressure accumulator ACC1 will reach the set pressure value through multiple cycles of pressurization.

[0041] In this embodiment, Figure 1 and Figure 2 As shown, the injection system also includes a low-pressure accumulator ACC2; the low-pressure accumulator ACC2 is connected to the rodless chamber of the injection cylinder 100 through a valve module, so that when rapid injection is performed, the low-pressure accumulator ACC2 supplies oil to the rodless chamber of the injection cylinder 100 under the control of the valve module.

[0042] It should be known that, when performing rapid injection, the traditional injection system mainly pumps hydraulic oil through the oil pump 300; the oil circuit of the corresponding injection system needs to be switched. During the oil circuit switching process, the impact force of the hydraulic oil in the oil circuit will interfere with the opening and closing process of the one-way valve, thereby affecting the pressure building stability of the injection system.

[0043] In the present embodiment, a low-pressure accumulator ACC2 is provided, and the low-pressure accumulator ACC2 can be connected to the rodless chamber of the injection cylinder 100 through a valve module. When performing rapid injection, the low-pressure accumulator ACC2 can supply oil to the rodless chamber of the injection cylinder 100 through the opening of the valve module, thereby realizing rapid driving of the piston rod of the injection cylinder 100. That is, during rapid injection, the low-pressure accumulator ACC2 acts as a power source to provide pressure for the injection cylinder 100. Since the low-pressure accumulator ACC2 directly acts on the rodless chamber of the injection cylinder 100, there is no switching process of the traditional oil circuit during rapid injection, thereby further improving the pressure building stability of the injection system.

[0044] Specifically, there are many specific structures for connecting the low-pressure accumulator ACC2 to the rodless chamber of the injection cylinder 100 through the valve module, one of which is as follows: Figure 1 and Figure 2 As shown, the valve module includes a control valve V2, and the low-pressure accumulator ACC2 is connected to the rodless chamber of the injection cylinder 100 through the control valve V2. When non-rapid injection is performed, the control valve V2 can keep the low-pressure accumulator ACC2 and the rodless chamber of the injection cylinder 100 in a cut-off state; while when rapid injection is performed, the control valve V2 can conduct the low-pressure accumulator ACC2 with the rodless chamber of the injection cylinder 100, and then the hydraulic oil in the low-pressure accumulator ACC2 can enter the rodless chamber of the injection cylinder 100 through the oil path along the control valve V2, thereby achieving the required rapid injection action.

[0045] In this embodiment, Figure 1 and Figure 4 As shown, the low-pressure accumulator ACC2 is also connected to the oil pump 300 through the valve module, so that the oil pump 300 stores energy in the low-pressure accumulator ACC2 under the control of the valve module.

[0046] It should be known that, from the above content, after the injection cylinder 100 completes the pressurization and injection, the hydraulic oil in the rodless chamber of the injection cylinder 100 will flow back to the oil tank; that is, with the increase in the number of rapid injections of the injection cylinder 100, the hydraulic oil stored in the low-pressure accumulator ACC2 will continue to decrease. When the hydraulic oil in the low-pressure accumulator ACC2 is insufficient, energy storage is required.

[0047] It should also be known that the energy storage resistance of the low-pressure accumulator ACC2 during energy storage is smaller than that of the high-pressure accumulator ACC1; therefore, there is no need to set a boosting mechanism when the low-pressure accumulator ACC2 is storing energy.

[0048] Specifically, there are various specific structures for connecting the low-pressure accumulator ACC2 to the oil pump 300 through the valve module, one of which is as follows: Figure 1 and Figure 4 As shown, the valve module includes a control valve V3, and the low-pressure accumulator ACC2 is connected to the oil pump 300 through the control valve V3. When the low-pressure accumulator ACC2 acts as a power source to supply oil to the rodless chamber of the injection cylinder 100, as shown in FIG. Figure 2 As shown in FIG. 1 , the control valve V3 is in the cut-off state and the control valve V2 is in the on state; the hydraulic oil in the low-pressure accumulator ACC2 will flow into the rodless chamber of the injection cylinder 100. When the low-pressure accumulator ACC2 needs to store energy, as shown in FIG. Figure 4 As shown, the control valve V3 is in the on state, and the control valve V2 is in the off state; then the oil pump 300 can pump the hydraulic oil into the low-pressure accumulator ACC2 for energy storage.

[0049] In this embodiment, Figures 1 to 6 As shown, the oil pump 300 adopts a multi-pump group, and the injection system also includes a servo motor M; the servo motor M can drive the multi-pump group to supply oil to the oil circuit.

[0050] It should be known that the multi-pump group can be double, triple or quadruple, etc., and can be set according to the actual needs of those skilled in the art. By driving and controlling the multi-pump group with the servo motor M, the switching of the working mode between low pressure and high flow and high pressure and low flow can be realized according to the working requirements of the injection system, thereby effectively reducing power consumption.

[0051] In this application, the specific structures and working principles of the control valves V1 to V3, the reversing valve V4 and the one-way valves V5 to V8 are well known to those skilled in the art, so they will not be elaborated in detail here. In order to increase the universality of the injection system, the control valves V1 to V3 can preferably be on-off valves.

[0052] Another aspect of the present application provides a die-casting machine, comprising the above-mentioned injection system.

[0053] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A shot injection system, characterized in that: It includes an injection oil cylinder, a high-pressure accumulator, a boosting mechanism and a valve module; the valve module connects the rodless chamber of the injection oil cylinder with the high-pressure accumulator through an oil circuit, so that when boosting injection is performed, the high-pressure accumulator directly supplies oil to the rodless chamber of the injection oil cylinder through the valve module; the boosting mechanism is connected to the high-pressure accumulator through the valve module to store energy in the high-pressure accumulator.

2. The injection system according to claim 1, characterized in that: The valve module includes a control valve V1, which connects the high-pressure accumulator with the rodless chamber of the injection cylinder through an oil circuit, and further controls the conduction between the high-pressure accumulator and the rodless chamber of the injection cylinder through the action of the control valve V1.

3. The injection system according to claim 2, characterized in that: The input end of the boosting mechanism is connected to the oil pump through the valve module, and the output end of the boosting mechanism is connected to the high-pressure accumulator through the valve module; the boosting mechanism is suitable for storing energy in the high-pressure accumulator after pressurizing the hydraulic oil pumped into the oil pump.

4. The injection system according to claim 3, characterized in that: The boosting mechanism includes a double-acting boosting cylinder; the valve module includes a reversing valve V4 and four one-way valves V5 to V8; the input end of the double-acting boosting cylinder is connected to the oil pump through the reversing valve, and the output end of the double-acting boosting cylinder is connected to the high-pressure accumulator through the boosting oil circuit formed by the one-way valve, so that the double-acting boosting cylinder is controlled by repeated reversing of the reversing valve V4 to input the hydraulic oil into the high-pressure accumulator after being pressurized by the boosting oil circuit.

5. The injection system according to claim 4, characterized in that: The injection system also includes a low-pressure accumulator; the low-pressure accumulator is connected to the rodless chamber of the injection cylinder through the valve module, so that when rapid injection is performed, the low-pressure accumulator supplies oil to the rodless chamber of the injection cylinder under the control of the valve module.

6. The injection system according to claim 5, characterized in that: The valve module includes a control valve V2, and the low-pressure accumulator is connected to the rodless chamber of the injection cylinder through the control valve V2.

7. The injection system according to claim 5, characterized in that: The low-pressure accumulator is also connected to an oil pump through the valve module, so that the oil pump stores energy in the low-pressure accumulator under the control of the valve module.

8. The injection system according to claim 7, characterized in that: The valve module includes a control valve V3, and the low-pressure accumulator is connected to the oil pump via the control valve V3.

9. The injection system according to any one of claims 3 to 8, characterized in that: The oil pump adopts a multi-pump group, and the injection system also includes a servo motor M; the servo motor M is suitable for driving the multi-pump group to supply oil to the oil circuit.

10. A die casting machine, characterized in that: The invention comprises the injection system as described in any one of claims 1 to 9.

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