Injection closed oil way and die casting machine

Abstract

The utility model discloses an injection closing oil way and a die-casting machine, and relates to the technical field of injection of the die-casting machine, the injection closing oil way comprises an oil supply system, a cartridge valve, a servo valve, a first hydraulic pipeline, a second hydraulic pipeline and a control unit, the oil supply system is connected with an injection cavity pipeline of an injection oil cylinder, the cartridge valve is arranged on the pipeline, and the servo valve is arranged on the first hydraulic pipeline. The servo valve is connected with a rod cavity of the injection oil cylinder, the first hydraulic pipeline and the second hydraulic pipeline are connected with the oil supply system and a control cavity of the cartridge valve, when injection is completed, the control device controls the servo valve to be closed, and hydraulic oil of the oil supply system enters the first hydraulic pipeline and the second hydraulic pipeline and then converges to flow to the control cavity of the cartridge valve so as to control the cartridge valve to be closed. It can be understood that the flow speed and pressure of the hydraulic oil can be increased by converging the hydraulic oil of the two pipelines, the hydraulic oil rapidly enters the control cavity of the cartridge valve so that the cartridge valve can be rapidly closed, the next operation of the die-casting machine can be conveniently carried out, and the working efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of die-casting machine injection, in particular to an injection closing oil circuit and a die-casting machine. Background Art

[0002] A die-casting machine is a machine used for pressure casting, commonly used in the production and processing of automotive parts, etc. 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.

[0003] The injection process of the existing cold chamber die casting machine can be divided into three stages: the first stage is the slow injection stage, the second stage is the fast injection stage, and the third stage is the pressurized injection stage. The slow injection stage requires a stable low speed to ensure that the exhaust process before the fast filling does not entrain air and ensure the molding quality; the fast injection stage is the fast filling molding process before the metal liquid cools. The fast filling molding process is because the solidification point of the alloy solution is low. The injection rod needs to be accelerated for a short time before the metal liquid solidifies in the fast filling stage to achieve good molding. Therefore, the speed of the die casting machine to adjust the injection speed determines the quality of the product molding.

[0004] There are usually two ways to adjust the injection speed during the rapid injection stage of existing die-casting machines: an outlet throttling method and an inlet throttling method. The two control methods have different principles. The outlet throttling method controls the speed of the injection piston by using a flow control valve (such as a servo valve) to control the flow of hydraulic oil discharged from the rod chamber of the injection cylinder; the inlet throttling method controls the speed of the injection piston by controlling the flow of hydraulic oil supplied to the rodless chamber of the injection cylinder through a flow control valve (such as a cartridge valve with adjustable opening).

[0005] When the die-casting machine uses the throttling-out method or the throttling-in method to control the injection speed in the rapid injection stage, it is necessary to control the flow control valve to close quickly for the next action (pressurized injection), otherwise it will affect the working efficiency of the die-casting machine. Therefore, improving the injection closing speed in the rapid injection stage has become an urgent problem to be solved. Utility Model Content

[0006] The main purpose of the utility model is to provide an injection closing oil circuit and a die-casting machine, aiming to improve the injection closing speed of the die-casting machine in the rapid injection stage and improve the working efficiency.

[0007] In order to achieve the above-mentioned purpose, the injection closing oil circuit proposed by the utility model comprises:

[0008] An oil supply system, used for supplying hydraulic oil to the injection cavity of the injection cylinder;

[0009] A cartridge valve connected to the oil supply system and used to control the flow rate of hydraulic oil supplied by the oil supply system to the injection cavity, wherein the opening of the cartridge valve can be mechanically adjusted;

[0010] A servo valve connected to the rod chamber of the injection cylinder, wherein the opening of the servo valve is adjusted by a control device;

[0011] a first hydraulic pipeline and a second hydraulic pipeline, connecting the oil supply system and the control chamber of the cartridge valve, for conveying the hydraulic oil supplied by the oil supply system to the control chamber of the cartridge valve, the first hydraulic pipeline being provided with a first electromagnetic reversing valve, and the second hydraulic pipeline being provided with a second electromagnetic reversing valve; and

[0012] The control unit controls the first electromagnetic reversing valve and the second electromagnetic reversing valve to lose power, so that the hydraulic oil flows to the control chamber of the cartridge valve through the first hydraulic pipeline and the second hydraulic pipeline, so that the cartridge valve is closed.

[0013] In one embodiment, the first hydraulic pipeline is connected to the second hydraulic pipeline so that the first electromagnetic reversing valve and the second electromagnetic reversing valve are connected in parallel.

[0014] In one embodiment, a third electromagnetic reversing valve is further provided on the second hydraulic pipeline, and the third electromagnetic reversing valve is located on a side of the second electromagnetic reversing valve close to the oil supply system.

[0015] In one embodiment, the first electromagnetic reversing valve, the second electromagnetic reversing valve and the third electromagnetic reversing valve are respectively connected to an oil tank, and a pipeline between the first electromagnetic reversing valve and the oil tank is connected to an oil return channel of the third electromagnetic reversing valve.

[0016] In one embodiment, a throttle valve is provided on the pipeline between the first electromagnetic reversing valve and the oil tank, the opening of the throttle valve is mechanically adjustable, and the throttle valve is located between the oil tank and the connection between the third electromagnetic reversing valve and the pipeline.

[0017] In one embodiment, the cartridge valve is provided with an opening adjustment device, and the opening adjustment device is used to mechanically adjust the opening of the cartridge valve.

[0018] In one embodiment, the injection closing oil circuit further includes an accumulator, which is located on the pipeline between the cartridge valve and the oil supply system and is used to increase the pressure and flow of the hydraulic oil in the pipeline.

[0019] In one embodiment, the injection closing oil circuit further includes a first one-way valve, and the first one-way valve is located between the oil supply system and the accumulator.

[0020] In one embodiment, the injection closing oil circuit further includes a second one-way valve, and the hydraulic oil of the oil supply system and the hydraulic oil flowing through the cartridge valve enter the injection cavity of the injection cylinder through the second one-way valve.

[0021] The technical solution of the utility model adopts the first hydraulic pipeline and the second hydraulic pipeline to connect the oil supply system and the control chamber of the cartridge valve so that the cartridge valve can be quickly closed. Specifically, the injection closing oil circuit includes an oil supply system, a cartridge valve, a servo valve, a first hydraulic pipeline, a second hydraulic pipeline and a control unit. The oil supply system is connected to the injection chamber pipeline of the injection oil cylinder. The cartridge valve is arranged on the pipeline to control the flow of hydraulic oil. The servo valve is connected to the rod chamber of the injection oil cylinder, and the injection chamber and the rod chamber are connected. The first hydraulic pipeline and the second hydraulic pipeline connect the oil supply system and the control chamber of the cartridge valve, and a first electromagnetic reversing valve is arranged on the first hydraulic pipeline, and a second electromagnetic reversing valve is arranged on the second hydraulic pipeline.

[0022] When the injection is completed and the next step needs to be entered, the control device controls the servo valve to close, and the control unit controls the first solenoid reversing valve and the second solenoid reversing valve to lose power, so that the first hydraulic pipeline and the second hydraulic pipeline are connected, and the hydraulic oil of the oil supply system enters the first hydraulic pipeline and the second hydraulic pipeline, and flows to the control chamber of the cartridge valve after passing through the first solenoid reversing valve and the second solenoid reversing valve respectively. It can be understood that the confluence of the hydraulic oil in the two pipelines can increase the flow rate and pressure of the hydraulic oil, and the hydraulic oil quickly enters the control chamber of the cartridge valve to quickly close the cartridge valve so that the die-casting machine can proceed to the next step, effectively improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A structural schematic diagram of an embodiment of the injection closing oil circuit provided by the utility model;

[0025] Figure 2 A schematic diagram of the structure of a reversing valve using an inlet throttling opening mode in an embodiment of an injection closing oil circuit provided by the utility model;

[0026] Figure 3 This is a structural schematic diagram of an embodiment of the injection closing oil circuit provided by the utility model, in which an outlet throttling mode is used to open a reversing valve.

[0027] Description of Figure Numbers:

[0028] 100, injection closing oil circuit; 110, oil supply system; 120, cartridge valve; 121, opening adjustment device; 130, servo valve; 131, control device; 140, first hydraulic pipeline; 141, first solenoid reversing valve; 142, first return oil pipeline; 143, throttle valve; 150, second hydraulic pipeline; 151, second solenoid reversing valve; 152, third solenoid reversing valve; 153, second return oil pipeline; 160, oil tank; 170, accumulator; 180, first non-return valve; 190, second non-return valve.

[0029] 200, injection cylinder; 210, injection chamber; 220, rod chamber.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] The utility model provides a pressure-injection closing oil circuit 100 .

[0035] See also Figures 1 to 3 In one embodiment of the utility model, the injection closing oil circuit 100 includes an oil supply system 110, a cartridge valve 120, a servo valve 130, a first hydraulic pipeline 140, a second hydraulic pipeline 150 and a control unit. The oil supply system 110 is connected to the injection chamber 210 of the injection cylinder 200 by pipeline. The cartridge valve 120 is arranged on the pipeline to control the flow of hydraulic oil. The servo valve 130 is connected to the rod chamber 220 of the injection cylinder 200, and the injection chamber 210 is connected to the rod chamber 220. The first hydraulic pipeline 140 and the second hydraulic pipeline 150 connect the oil supply system 110 and the control chamber of the cartridge valve 120, and the first hydraulic pipeline 140 is provided with a first electromagnetic reversing valve 141, and the second hydraulic pipeline 150 is provided with a second electromagnetic reversing valve 151. The arrows on the pipelines in the figure indicate the flow direction of the hydraulic oil.

[0036] When the injection is completed and the next step needs to be entered, the control device 131 controls the servo valve 130 to close, and the control unit controls the first solenoid reversing valve 141 and the second solenoid reversing valve 151 to lose power, so that the first hydraulic pipeline 140 and the second hydraulic pipeline 150 are connected, and the hydraulic oil of the oil supply system 110 enters the first hydraulic pipeline 140 and the second hydraulic pipeline 150, and flows to the control chamber of the cartridge valve 120 after passing through the first solenoid reversing valve 141 and the second solenoid reversing valve 151 respectively. It can be understood that the confluence of the hydraulic oil of the two pipelines can increase the flow rate and pressure of the hydraulic oil, and the hydraulic oil quickly enters the control chamber of the cartridge valve 120 to quickly close the cartridge valve 120 so that the die-casting machine can proceed to the next step, effectively improving the work efficiency.

[0037] In one embodiment, the first hydraulic line 140 is connected to the second hydraulic line 150 so that the first electromagnetic reversing valve 141 and the second electromagnetic reversing valve 151 are connected in parallel.

[0038] like Figure 1 As shown, in one embodiment of the utility model, the first hydraulic pipeline 140 connects the oil supply system 110 and the control chamber of the cartridge valve 120, and the second hydraulic pipeline 150 is connected to the first hydraulic pipeline 140, so that the first solenoid reversing valve 141 and the second solenoid reversing valve 151 are connected in parallel. When the injection is completed, the control unit controls the first solenoid reversing valve 141 and the second solenoid reversing valve 151 to lose power, and the hydraulic oil flows through the first solenoid reversing valve 141 and the second solenoid reversing valve 151 respectively. After the hydraulic oil in the second hydraulic pipeline 150 passes through the second solenoid reversing valve 151, it merges with the hydraulic oil in the first hydraulic pipeline 140 and flows along the first hydraulic pipeline 140 to the control chamber of the cartridge valve 120 to quickly close the cartridge valve 120.

[0039] In one embodiment, a third electromagnetic reversing valve 152 is further disposed on the second hydraulic pipeline 150 , and the third electromagnetic reversing valve 152 is located on a side of the second electromagnetic reversing valve 151 close to the oil supply system 110 .

[0040] like Figure 1 As shown, in one embodiment of the utility model, a third solenoid reversing valve 152 is further provided on the second hydraulic pipeline 150, and the third solenoid reversing valve 152 is located on a side of the second solenoid reversing valve 151 close to the oil supply system 110. When the injection is completed and the cartridge valve 120 needs to be quickly closed, the control unit controls the third solenoid reversing valve 152 to be energized, and the first solenoid reversing valve 141 and the second solenoid reversing valve 151 are de-energized. The hydraulic oil input from the oil supply system 110 flows along the first hydraulic pipeline 140 to the first solenoid reversing valve 141, and flows along the second hydraulic pipeline 150 through the third solenoid reversing valve 152 to the second solenoid reversing valve 151. The hydraulic oil flowing out of the first solenoid reversing valve 141 merges with the hydraulic oil flowing out of the second solenoid reversing valve 151 and continues to flow along the first hydraulic pipeline 140 to control the cartridge valve 120 to be closed. The third electromagnetic reversing valve 152 is provided to realize both outlet throttling and inlet throttling injection speed regulation modes of the die casting machine, which will be described in detail below.

[0041] In one embodiment, the first solenoid reversing valve 141, the second solenoid reversing valve 151 and the third solenoid reversing valve 152 are respectively connected to the oil tank 160, and the pipeline between the first solenoid reversing valve 141 and the oil tank 160 is connected to the oil return channel of the third solenoid reversing valve.

[0042] like Figure 2 and Figure 3 As shown, in one embodiment of the utility model, in the slow injection stage of the die-casting machine, the hydraulic oil is slowly injected into the injection cavity 210 by the oil supply system 110. When entering the fast injection stage, the die-casting machine is in the outlet throttling state, and the first electromagnetic reversing valve 141 controls the cartridge valve 120 to open; the die-casting machine is in the inlet throttling state, and the first electromagnetic reversing valve 141, the second electromagnetic reversing valve 151 and the third electromagnetic reversing valve 152 simultaneously control the cartridge valve 120; specifically, the first electromagnetic reversing valve 141, the second electromagnetic reversing valve 151 and the third electromagnetic reversing valve 152 are connected to the oil tank 160, and the die-casting machine is in the outlet throttling state, please refer to Figure 3 The control unit controls the first solenoid reversing valve 141 to be energized, the second solenoid reversing valve 151 and the third solenoid reversing valve 152 to be de-energized, the hydraulic oil in the control chamber of the cartridge valve 120 flows back to the oil tank 160 through the first solenoid reversing valve 141, the cartridge valve 120 gradually changes to a fully open state, and the servo valve 130 is controlled to be highly opened through the control device 131, so that the die-casting machine enters an outlet throttling state.

[0043] Please refer to Figure 2When the die-casting machine is in the inlet throttling state, the control unit controls the first electromagnetic reversing valve 141, the second electromagnetic reversing valve 151 and the third electromagnetic reversing valve 152 to be energized, the first electromagnetic reversing valve 141 is connected to the oil tank 160 through the first return oil pipeline 142, and the return oil channel of the third electromagnetic reversing valve 152 is connected to the first return oil pipeline 142 through the second return oil pipeline 153. The hydraulic oil in the control chamber of the cartridge valve 120 flows along the first hydraulic pipeline 140 and returns to the oil tank 160 through the second electromagnetic reversing valve 151. The hydraulic oil continues to flow along the first hydraulic pipeline 140 to the first electromagnetic reversing valve 141, and then returns to the oil tank 160 along the first return oil pipeline 142, and part of the hydraulic oil passes through the second return oil pipeline 153 and the third electromagnetic reversing valve 152 and returns to the oil tank, so as to realize the rapid opening of the cartridge valve 120.

[0044] In one embodiment, a throttle valve 143 is provided on the pipeline between the first electromagnetic reversing valve 141 and the oil tank 160. The opening of the throttle valve 143 can be mechanically adjusted. The throttle valve 143 is located between the oil tank 160 and the connection between the third electromagnetic reversing valve and the pipeline.

[0045] like Figure 3 As shown, in one embodiment of the utility model, a throttle valve 143 is installed on the first oil return pipeline 142, and the opening of the throttle valve 143 is mechanically adjustable. When the die-casting machine is in the outlet throttling state, the cartridge valve 120 needs to be opened slowly to prevent the injection speed from fluctuating. At this time, the first solenoid reversing valve 141 is energized, and the hydraulic oil in the control chamber of the cartridge valve 120 enters the first oil return pipeline 142 from the first solenoid reversing valve 141, and flows back to the oil tank 160 through the throttle valve 143. The throttle valve 143 is slowly opened to control the flow rate of the reflux hydraulic oil, so that the opening speed of the cartridge valve 120 can be gradually and controllably reached to the fully open state to ensure the stability of the die-casting process.

[0046] In one embodiment, an opening adjustment device 121 is provided on the cartridge valve 120 , and the opening adjustment device 121 is used to mechanically adjust the opening of the cartridge valve 120 .

[0047] like Figures 1 to 3 As shown, in one embodiment of the utility model, an opening adjustment device 121 is provided on the cartridge valve 120. The device is driven by a motor or adjusted by a hand wheel to limit the position to which the valve core of the cartridge valve 120 can be opened to adjust the opening of the cartridge valve 120. The hydraulic oil is used as the control oil to open or close the cartridge valve 120. During the opening process of the cartridge valve 120, the opening adjustment device 121 can accurately adjust the opening of the cartridge valve 120, control the flow of the hydraulic oil, maintain the pressure of the hydraulic oil in the system stable, and prevent pressure fluctuations from causing damage to pipelines and equipment.

[0048] In one embodiment, the injection closing oil circuit 100 further includes an accumulator 170 , which is located on the pipeline between the cartridge valve 120 and the oil supply system 110 and is used to increase the pressure and flow of the hydraulic oil in the pipeline.

[0049] like Figures 1 to 3 As shown, in one embodiment of the utility model, the accumulator 170 is arranged on the pipeline between the cartridge valve 120 and the oil supply system 110. The die-casting machine usually has a slow injection stage, a fast injection stage, a pressurization stage, a pressure holding stage and a hammer head follow-up stage. When the shooting rod moves to the fast injection trigger position, the accumulator 170 is required to quickly release a large amount of hydraulic oil into the injection cavity 210 to increase the injection speed of the shooting rod and achieve good filling of the molten metal.

[0050] In one embodiment, the injection closing oil circuit 100 further includes a first one-way valve 180 , and the first one-way valve 180 is located between the oil supply system 110 and the accumulator 170 .

[0051] like Figures 1 to 3 As shown, in one embodiment of the utility model, a first one-way valve 180 is further provided between the accumulator 170 and the oil supply system 110. The first one-way valve 180 prevents the hydraulic oil in the pipeline from flowing back to the oil supply system 110, so that the hydraulic oil discharged from the accumulator 170 flows to the injection cavity 210 of the injection cylinder 200, thereby ensuring the flow rate and pressure of the hydraulic oil.

[0052] In one embodiment, the injection closing oil circuit 100 further includes a second one-way valve 190 , and the hydraulic oil of the oil supply system 110 and the hydraulic oil flowing through the cartridge valve 120 enter the injection cavity 210 of the injection cylinder 200 through the second one-way valve 190 .

[0053] like Figures 1 to 3 As shown, in one embodiment of the utility model, the pipeline between the cartridge valve 120 and the injection cavity 210 of the injection cylinder 200 is connected to the pipeline of the oil supply system 110, and the second one-way valve 190 is arranged at a position between the connection of the two pipelines and the injection cavity 210. The hydraulic oil from the oil supply system 110 and the hydraulic oil flowing through the cartridge valve 120 merge and enter the injection cavity 210 through the second one-way valve 190. The second one-way valve 190 is used to prevent the hydraulic oil in the injection cavity 210 from flowing back, thereby improving the stability of the injection process and facilitating the subsequent pressure maintenance work of the die-casting machine.

[0054] The utility model also proposes a die-casting machine, which includes an injection shut-off oil circuit 100. The specific structure of the injection shut-off oil circuit 100 refers to the above-mentioned embodiment. Since the die-casting machine adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0055] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A shot closing oil circuit, characterized in that: The injection closing oil circuit comprises: An oil supply system, used for supplying hydraulic oil to the injection cavity of the injection cylinder; A cartridge valve connected to the oil supply system and used to control the flow rate of hydraulic oil supplied by the oil supply system to the injection cavity, wherein the opening of the cartridge valve can be mechanically adjusted; A servo valve connected to the rod chamber of the injection cylinder, wherein the opening of the servo valve is adjusted by a control device; a first hydraulic pipeline and a second hydraulic pipeline, connecting the oil supply system and the control chamber of the cartridge valve, for conveying the hydraulic oil supplied by the oil supply system to the control chamber of the cartridge valve, the first hydraulic pipeline being provided with a first electromagnetic reversing valve, and the second hydraulic pipeline being provided with a second electromagnetic reversing valve; and The control unit controls the first electromagnetic reversing valve and the second electromagnetic reversing valve to lose power, so that the hydraulic oil flows to the control chamber of the cartridge valve through the first hydraulic pipeline and the second hydraulic pipeline, so that the cartridge valve is closed.

2. The injection closing oil circuit according to claim 1, characterized in that: The first hydraulic pipeline is connected to the second hydraulic pipeline so that the first electromagnetic reversing valve and the second electromagnetic reversing valve are connected in parallel.

3. The injection closing oil circuit according to claim 2, characterized in that: The second hydraulic pipeline is also provided with a third electromagnetic reversing valve, and the third electromagnetic reversing valve is located on a side of the second electromagnetic reversing valve close to the oil supply system.

4. The injection closing oil circuit according to claim 3, characterized in that: The first electromagnetic reversing valve, the second electromagnetic reversing valve and the third electromagnetic reversing valve are respectively connected to the oil tank, and the pipeline between the first electromagnetic reversing valve and the oil tank is connected to the oil return channel of the third electromagnetic reversing valve.

5. The injection closing oil circuit according to claim 4, characterized in that: A throttle valve is provided on the pipeline between the first electromagnetic reversing valve and the oil tank, the opening of the throttle valve can be mechanically adjusted, and the throttle valve is located between the oil tank and the connection between the third electromagnetic reversing valve and the pipeline.

6. The injection closing oil circuit according to claim 1, characterized in that: The cartridge valve is provided with an opening adjustment device, and the opening adjustment device is used to mechanically adjust the opening of the cartridge valve.

7. The injection closing oil circuit according to any one of claims 1 to 6, characterized in that: The injection closing oil circuit also includes an accumulator, which is located on the pipeline between the cartridge valve and the oil supply system and is used to increase the pressure and flow of the hydraulic oil in the pipeline.

8. The injection closing oil circuit according to claim 7, characterized in that: The injection closing oil circuit also includes a first one-way valve, which is located between the oil supply system and the accumulator.

9. The injection closing oil circuit according to claim 8, characterized in that: The injection closing oil circuit further includes a second one-way valve, and the hydraulic oil of the oil supply system and the hydraulic oil flowing through the cartridge valve enter the injection cavity of the injection cylinder through the second one-way valve.

10. A die casting machine, characterized in that: It comprises the injection closing oil circuit as claimed in any one of claims 1 to 9.

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