Buffered active plug-in valve and control oil circuit and die casting machine

Abstract

The application discloses a buffering active plug-in valve and a control oil circuit and a die casting machine. The die casting machine comprises the buffering active plug-in valve and the control oil circuit. The buffering active plug-in valve and the control oil circuit comprise a valve shell, a gland, a cover plate, a valve core and a valve sleeve. The valve shell is provided with a valve cavity, an inlet channel and an outlet. The valve core is movably arranged in the valve cavity between a first position and a second position. When the valve core is in the first position, the inlet channel and the outlet are opened. When the valve core is in the second position, the outlet and part of the inlet channel are closed. When the valve core moves from the second position to the first position, the valve core can reduce the flow area of the valve cavity and the inlet channel, so as to reduce the thrust of the inlet liquid on the valve core. The application aims to reduce the movement speed of the valve core and eliminate the noise generated by the valve core impacting on the valve shell.

Description

Technical Field

[0001] This invention relates to the field of die casting machines, and particularly to a buffered active cartridge valve and control oil circuit, as well as a die casting machine. Background Technology

[0002] Die casting machines are industrial casting machines that use pressure to inject molten metal into a mold, where it cools and solidifies, resulting in a solid metal casting. Initially used for die casting type, die casting technology has developed rapidly with advancements in science and technology, particularly in the automotive, motorcycle, and household appliance industries, driven by energy conservation and raw material savings. Currently, the hydraulic circuits in die casting machines are primarily controlled by ordinary cartridge valves. However, the long opening and closing times of these valves result in slow injection response. Some die casting machines use active cartridge valves, but these generate excessive noise during opening and closing. Summary of the Invention

[0003] The main objective of this invention is to propose an invention that aims to reduce the movement speed of the valve core and eliminate the noise generated by the valve core impacting the valve body.

[0004] To achieve the above objectives, this invention proposes a buffered active cartridge valve and its control oil circuit, applicable to a die-casting machine, comprising:

[0005] A valve housing having a valve cavity and an inlet channel and an outlet communicating with the valve cavity;

[0006] The valve core is disposed in the valve cavity and can be movably switched between a first position and a second position. When the valve core is in the first position, it opens the liquid inlet channel and the liquid outlet; when the valve core is in the second position, it closes the liquid outlet and part of the liquid inlet channel.

[0007] When the valve core moves from the second position to the first position, the valve core can reduce the flow area between the valve cavity and the liquid inlet channel, so as to reduce the thrust of the liquid inlet on the valve core.

[0008] In one embodiment, the buffered active cartridge valve and control circuit further include a valve sleeve, which is fitted onto the valve core and used to seal the valve core and the valve body.

[0009] In one embodiment, the inlet channel includes a first channel and a second channel spaced apart; when the valve core is in the first position, the valve core opens the outlet, the first channel, and the second channel; when the valve core is in the second position, the valve core closes the outlet and the first channel.

[0010] In one embodiment, the valve core includes a core body and a sealing portion disposed on the outer periphery of the core body, and the valve cavity includes a first cavity section, a second cavity section, and a third cavity section with gradually increasing inner diameters. The first cavity section is connected to the liquid outlet, the second cavity section is connected to the first flow channel, and the third cavity section is connected to the second flow channel.

[0011] When the valve core is in the first position, a gap is formed between the core body and the cavity wall of the valve chamber, connecting the liquid outlet, the first flow channel and the second flow channel; when the valve core is in the second position, the core body blocks the liquid outlet, and the blocking part blocks the first flow channel to close the first flow channel.

[0012] In one embodiment, the buffered active cartridge valve and control circuit further include an oil tank, a control valve, and a branch assembly. The control valve is disposed on the branch assembly. The oil tank is connected to the first flow channel and the second flow channel respectively through the control valve. The left position of the control valve is connected to the first flow channel, and the right position of the control valve is connected to the second flow channel.

[0013] In one embodiment, the buffered active cartridge valve and control circuit further include a variable diameter flow channel, which is disposed on the branch assembly, and the right position of the control valve is connected to the second flow channel through the variable diameter flow channel.

[0014] In one embodiment, the buffered active cartridge valve and control circuit further include a check valve device, the variable diameter flow channel and the check valve device are connected in parallel on the branch assembly, and the right position of the control valve is connected to the second flow channel through the check valve device.

[0015] In one embodiment, the buffered active cartridge valve and control circuit further include an elastic element connected to the valve core and located on the movement path of the valve core from the first position to the second position, for pressing against the valve core.

[0016] In one embodiment, the buffered active cartridge valve and control circuit further include a plurality of seals, which are respectively located on the contact surfaces of the valve core and the valve body.

[0017] In one embodiment, the valve housing includes a first housing and a second housing, the first housing being disposed on the second housing, and the first housing and the second housing enclosing each other to form the valve cavity.

[0018] The present invention also includes a die-casting machine, the die-casting machine comprising a buffered active cartridge valve and a control oil circuit, the buffered active cartridge valve and the control oil circuit comprising:

[0019] A valve housing having a valve cavity and an inlet channel and an outlet communicating with the valve cavity;

[0020] The valve core is disposed in the valve cavity and can be movably switched between a first position and a second position. When the valve core is in the first position, it opens the liquid inlet channel and the liquid outlet; when the valve core is in the second position, it closes the liquid outlet and part of the liquid inlet channel.

[0021] When the valve core moves from the second position to the first position, the valve core can reduce the flow area between the valve cavity and the liquid inlet channel, so as to reduce the thrust of the liquid inlet on the valve core. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of an embodiment of the buffered active cartridge valve and control oil circuit of the present invention;

[0024] Figure 2 This is a schematic diagram of another embodiment of the buffered active cartridge valve and control oil circuit of the present invention;

[0025] Figure 3 for Figure 2 Partial schematic diagram A;

[0026] Figure 4 for Figure 3 Partial schematic diagram B.

[0027] Explanation of icon numbers:

[0028] 10 valve housing 11 valve chamber 12 Inlet channel 121 First Stream 122 Second flow channel 13 Liquid outlet 14 First shell 15 Second shell 16 Second positioning groove 20 valve core 21 Core 22 Blocking Department 23 First positioning groove 30 valve sleeve 40 tank 50 control valve 60 Variable flow channel 70 One-way valve device 80 elastic element

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] This invention proposes an active cartridge valve with buffer and a control oil circuit.

[0034] Reference Figures 1-4 In this embodiment of the invention, a buffered active cartridge valve and control oil circuit are applied to a die-casting machine, comprising:

[0035] The valve housing 10 has a valve cavity 11 and an inlet channel 12 and an outlet 13 communicating with the valve cavity 11.

[0036] The valve core 20 is disposed in the valve cavity 11 and can be movably switched between a first position and a second position. When the valve core 20 is in the first position, it opens the liquid inlet channel 12 and the liquid outlet 13; when the valve core 20 is in the second position, it closes the liquid outlet 13 and part of the liquid inlet channel 12.

[0037] When the valve core 20 moves from the second position to the first position, the valve core 20 can reduce the flow area between the valve cavity 11 and the liquid inlet channel 12, so as to reduce the thrust of the liquid inlet on the valve core 20.

[0038] This invention provides a buffered active cartridge valve and its control circuit. When the valve core 20 moves towards the valve housing 10, it changes the pressure within the valve cavity 11 by altering the volume of the cavity. This pressure change adjusts the speed at which the valve core 20 moves from the second position to the first position, specifically, the speed at which it moves towards the valve housing 10. Specifically, when the outlet 13 and the inlet channel 12 are connected, the pressure within the valve cavity 11 is constant. As the valve core 20 moves towards the valve housing 10, the outlet 13 is closed, and the inlet channel 12 is gradually partially closed, thus gradually reducing the volume of the valve cavity 11. This is used to change the pressure inside the valve chamber 11, thereby increasing the pressure inside the valve chamber 11. As the pressure inside the valve chamber 11 increases, the valve core 20 slows down its movement towards the valve body 10. Specifically, when the valve core 20 moves quickly to the top of the valve body 10, it will encounter two resistances: one from the outlet and the other from the inlet channel. As the valve core 20 moves, the outlet 13 and the inlet channel are gradually closed by the valve core 20, and the resistance of the fluid discharged from the valve chamber 11 also increases. Therefore, these two resistances will reduce the movement speed of the valve core 20. By slowing down this speed, the valve core 20 slowly impacts the valve body 10, thereby eliminating the noise generated by the valve core 20 impacting the valve body 10.

[0039] When the valve core 20 is fully open, the valve core 20 moves to a distance of 0.2 to 0.4 mm from the valve housing 10. Preferably, the diameter of the valve housing 10 is equal to the diameter of the valve core plus (0.2 to 0.4 mm), forming a clearance fit, which is the buffer space for the movement of the valve core 20. Therefore, when the valve core 20 is fully open, it can enter the valve housing 10, thereby reducing the impact of the valve core on the valve housing 10.

[0040] Reference Figure 1 In this embodiment of the invention, the valve sleeve 30 is further included. The valve sleeve 30 is sleeved on the valve core 20 and is used to seal the valve core 20 and the valve housing 10.

[0041] The valve sleeve 30 ensures that the valve core 20 and the valve body 10 are well sealed together, preventing fluid leakage from the valve cavity 11.

[0042] Reference Figures 1-2 In this embodiment of the invention, the liquid inlet channel 12 includes a first channel 121 and a second channel 122 that are spaced apart.

[0043] When the valve core 20 is in the first position, the valve core 20 opens the liquid outlet 13, the first flow channel 121 and the second flow channel 122; when the valve core 20 is in the second position, the valve core 20 closes the liquid outlet 13 and the first flow channel 121.

[0044] When the valve core 20 opens the outlet 13, the first flow channel 121, and the second flow channel 122, that is, when the fluid flows rapidly into the valve cavity 11 through the first flow channel 121 and the second flow channel 122, the valve core 20 moves rapidly towards the valve body 10. As the valve core 20 moves, the outlet 13 is closed, the first flow channel 121 is gradually blocked, and the flow rate of the fluid flowing into the valve cavity 11 through the first flow channel 121 and the second flow channel 122 gradually decreases. Consequently, the resistance of the fluid in the valve cavity 11 to the flow into the first flow channel 121 and the second flow channel 122 increases, and the resistance of the fluid discharged from the valve cavity 11 also increases, resulting in an increase in the pressure in the valve cavity 11. Consequently, the speed at which the valve core 20 moves from the first position to the second position slows down. Specifically, this slows down the speed at which the valve core 20 moves towards the valve body 10. By slowing down this speed, the valve core 20 slowly impacts the valve body 10, thereby eliminating the noise generated by the valve core 20 impacting the valve body 10.

[0045] Reference Figures 1-2 In this embodiment of the invention, the valve core 20 includes a core body 21 and a sealing portion 22 disposed on the outer periphery of the core body 21. The valve cavity 11 includes a first cavity section, a second cavity section and a third cavity section with gradually increasing inner diameter. The first cavity section is connected to the liquid outlet 13, the second cavity section is connected to the first flow channel 121, and the third cavity section is connected to the second flow channel.

[0046] When the valve core 20 is in the first position, a gap is formed between the core body 21 and the cavity wall of the valve cavity 11, connecting the liquid outlet 13, the first flow channel 121 and the second flow channel 122; when the valve core 20 is in the second position, the core body 21 blocks the liquid outlet 13 and the blocking part 22 blocks the first flow channel 121 to close the first flow channel.

[0047] When the valve core 20 opens the outlet 13, the first flow channel 121, and the second flow channel 122, that is, when the fluid rapidly flows through the outlet 13, the first flow channel 121, and the second flow channel 122 into the first cavity, the second cavity, and the third cavity respectively, the valve core 20 moves rapidly towards the valve body 10. As the valve core 20 moves, the outlet 13 is closed by the core body 21, and the first flow channel 121 is gradually blocked by the sealing part 22. The flow rate of fluid flowing into the valve cavity 11 through the first flow channel 121 and the second flow channel 122 gradually decreases. As the pressure decreases, the resistance of the fluid in the valve cavity 11 flowing into the first flow channel 121 and the second flow channel 122 also increases, and the resistance of the fluid discharged from the valve cavity 11 also increases, resulting in an increase in the pressure in the valve cavity 11. Consequently, the speed at which the valve core 20 moves from the first position to the second position slows down. Specifically, this slows down the speed at which the valve core 20 moves towards the valve housing 10. By slowing down this speed, the valve core 20 slowly impacts the valve housing 10, thereby eliminating the noise generated by the valve core 20 impacting the valve housing 10.

[0048] Reference Figures 1-2 In this embodiment of the invention, the system further includes an oil tank 40, a control valve 50, and a branch assembly. The control valve 50 is disposed on the branch assembly. The oil tank 40 is connected to the first flow channel 121 and the second flow channel 122 respectively through the control valve 50. The left position of the control valve 50 is connected to the first flow channel 121, and the right position of the control valve 50 is connected to the second flow channel 122.

[0049] Specifically, when the control valve 50 is de-energized, when the control valve 50 is in the left position, the fluid in the oil tank 40 flows into the valve chamber 11 through the first flow channel 121, and the fluid in the valve chamber 11 flows into the oil tank 40 through the second flow channel 222. Therefore, the pressure in the second control chamber 221 is less than the pressure in the first control chamber 211. At this time, the valve core 20 gradually closes. Since the valve core 20 closes slowly, there will be no impact between the valve core 20 and the valve body 10.

[0050] When the control valve 50 is energized and operates in the right position, the fluid in the oil tank 40 enters the second flow channel 222 and then enters the valve chamber 11, which in turn drives the valve core 20 to move upward. During the upward movement of the valve core 20, the volume of the valve chamber 11 decreases, and the oil inlet of the first flow channel 121 becomes smaller and smaller. Consequently, the resistance to the discharge of the fluid in the valve chamber 11 increases, thereby reducing the upward movement speed of the valve core 20. As a result, the speed of the valve core 20 moving towards the valve body 10 slows down. By slowing down the speed, the valve core 20 slowly impacts the valve body 10, thereby eliminating the noise generated by the valve core 20 impacting the valve body 10.

[0051] Reference Figures 1-2In this embodiment of the invention, the flow also includes a variable diameter flow channel 60, which is disposed on the branch assembly. The right side of the control valve 50 is connected to the second flow channel 122 through the variable diameter flow channel 60.

[0052] By setting and adjusting the variable diameter flow channel 60, the fluid in the valve chamber 11 can slowly flow into the oil tank 40 through the second flow channel 122 and the variable diameter flow channel 60. Specifically, when the control valve 50 is de-energized and the control valve 50 is in the left position, the fluid in the oil tank 40 flows into the valve chamber 11 through the first flow channel 121, and the fluid in the valve chamber 11 flows into the oil tank 40 through the second flow channel 122 and the variable diameter flow channel 60. Since the fluid in the valve chamber 11 slowly flows out through the variable diameter flow channel 60, the fluid in the valve chamber 11 flows into the oil tank 40. At this time, the valve core 20 gradually closes. Since the valve core 20 closes slowly, there will be no impact between the valve core 20 and the valve body 10.

[0053] When the control valve 50 is energized and operates in the right position, the fluid in the oil tank 40 enters the variable diameter flow channel 60 and then the second flow channel 122. As the valve core 20 moves upward, the volume of the valve cavity 11 decreases, and the fluid in the valve cavity 11 is discharged through the first flow channel 121. The oil inlet of the first flow channel 121 becomes smaller and smaller, and the discharge of the fluid in the valve cavity 11 increases the resistance, thereby reducing the upward speed of the valve core 20. As a result, the speed of the valve core 20 moving towards the valve body 10 slows down. By slowing down the speed, the valve core 20 slowly impacts the valve body 10, thereby eliminating the noise generated by the valve core 20 impacting the valve body 10.

[0054] Reference Figures 1-2 In this embodiment of the invention, the system further includes a one-way valve device 70. The variable diameter flow channel 60 and the one-way valve device 70 are connected in parallel on the branch assembly. The right side of the control valve 50 is connected to the second flow channel 122 through the one-way valve device 70.

[0055] Because the orifice of the one-way valve device 70 is relatively large, the fluid in the oil tank 40 enters the second flow channel 122 simultaneously through the variable diameter flow channel 60 and the one-way valve device 70. Due to the large orifice of the one-way valve device 70, the fluid can quickly enter the valve chamber 11 through the second flow channel 122. This causes the valve core 20 to move rapidly to a certain position, gradually blocking the first flow channel 121. As a result, the oil inlet of the first flow channel 121 becomes smaller and smaller, and the resistance of the valve chamber 11 to enter the first flow channel 121 becomes larger and larger, which improves efficiency and saves time.

[0056] Reference Figures 1-2In this embodiment of the invention, the device further includes an elastic element 80, which is connected to the valve core 20 and located on the movement path of the valve core 20 from the first position to the second position, and is used to press against the valve core 20.

[0057] In the initial state, the elastic element 80 is in its natural state. When the valve core 20 moves towards the valve housing 10, the valve core 20 gradually covers the first flow channel 121 during its movement. The oil inlet of the first flow channel 121 becomes smaller and smaller, and consequently, the resistance of the fluid in the valve cavity 11 to entering the first flow channel 121 increases. This slows down the movement of the valve core 20 towards the valve housing 10, thereby eliminating the noise generated by the valve core 20 impacting the valve housing 10. During this movement, the elastic element 80 can apply a certain thrust to both the valve core 20 and the valve housing 10. Specifically, the valve cavity 11 includes a first cavity section, a second cavity section, and a... with gradually increasing inner diameters. The third chamber is connected to the outlet 13, the second chamber is connected to the first flow channel 121, and the third chamber is connected to the second flow channel. Therefore, when the valve core 20 moves to a certain position, the pressure in the first chamber plus the force generated by the elastic element 80 is greater than the pressure in the second and third chambers, and the valve core 20 closes. When the pressure in the first chamber plus the force generated by the elastic element 80 is less than the pressure in the second and third chambers, the valve core 20 opens. This design improves the stability of the valve core 20 when it moves towards the valve body 10, eliminates the noise generated by the valve core 20 hitting the valve body 10, and realizes the rapid opening or closing of the valve core 20.

[0058] Reference Figures 1-2 In this embodiment of the invention, the contact surfaces of the elastic element 80 that contact the valve core 20 and the valve housing 10 respectively are recessed to form a first positioning groove 23 and a second positioning groove 16. The first positioning groove 23 and the second positioning groove 16 are used to fix the elastic element. By setting the first positioning groove 23 and the second positioning groove 16, the elastic element 80 can be better installed and fixed, avoiding the phenomenon of the elastic element 80 loosening or falling off during movement.

[0059] Reference Figures 1-2 In this embodiment of the invention, the elastic element 80 may be a spring.

[0060] Reference Figures 1-2 In this embodiment of the invention, the valve core 20 is further provided with a plurality of sealing elements, which are respectively located on the contact surfaces of the valve core 20 and the valve housing 10.

[0061] By incorporating a seal, wear on the valve core 20 during operation is reduced, thereby extending its service life and lowering costs.

[0062] Reference Figures 1-2In this embodiment of the invention, the valve housing 10 includes a first housing 14 and a second housing 15. The first housing 14 is disposed on the second housing 15, and the first housing 14 and the second housing 15 together form the valve cavity 11.

[0063] By detachably installing the first housing 14 and the second housing 15, subsequent maintenance work can be carried out quickly by disassembling the first housing 14 and the second housing 15, thereby improving maintenance efficiency and saving time.

[0064] Reference Figures 1-4 In this embodiment of the invention, when the valve core 20 is fully open, the valve core 20 can move to a distance of 0.2 to 0.4 mm from the contact surface between the first housing 12 and the valve core 20. The diameter of the valve housing 10 is equal to the diameter of the valve core 20 plus (0.2 to 0.4 mm).

[0065] When the valve core 20 enters the valve housing 10, the valve core 20 moves to a distance of 0.2 to 0.4 mm from the contact surface between the valve housing 10 and the valve core 20. Therefore, when it reaches this position, the valve core 20 is fully opened, thereby achieving the effect of throttling and reducing the impact of the valve core on the first housing.

[0066] Where L2 = L1 + (1 - 2.5 mm), L1 is the valve core stroke, and L2 is the distance from the valve core 20 boss to the outside of the first flow channel 121; when the valve core 20 is fully opened, the fluid in the first control chamber 211 will gradually block the first flow channel 121 as it returns to the oil tank 40. As the valve core 20 is opened, the oil inlet of the first flow channel 121 will become smaller and smaller. Consequently, the resistance of the oil in the first control chamber 211 to entering the first flow channel 121 will become larger and larger, thereby throttling and reducing the impact of the valve core 20 on the valve body 10.

[0067] The present invention also proposes a die-casting machine, comprising:

[0068] The valve housing 10 has a valve cavity 11 and an inlet channel 12 and an outlet 13 communicating with the valve cavity 11.

[0069] The valve core 20 is disposed in the valve cavity 11 and can be movably switched between a first position and a second position. When the valve core 20 is in the first position, it opens the liquid inlet channel 12 and the liquid outlet 13; when the valve core 20 is in the second position, it closes the liquid outlet 13 and part of the liquid inlet channel 12.

[0070] When the valve core 20 moves from the second position to the first position, the valve core 20 can reduce the flow area between the valve cavity 11 and the liquid inlet channel 12, so as to reduce the thrust of the liquid inlet on the valve core 20.

[0071] The present invention also proposes a die casting machine, which includes, since the die casting machine adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0072] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A buffered active cartridge valve and its control oil circuit, applied to a die-casting machine, characterized in that, include: A valve housing having a valve cavity and an inlet channel and an outlet communicating with the valve cavity; The valve core is disposed in the valve cavity and can be movably switched between a first position and a second position. When the valve core is in the first position, the active cartridge valve is open; when the valve core is in the second position, the active cartridge valve is closed. When the valve core moves from the second position to the first position, the valve core can reduce the flow area between the valve cavity and the liquid inlet channel, so as to reduce the thrust of the liquid inlet on the valve core; The liquid inlet channel includes a first flow channel and a second flow channel arranged at intervals; The valve core includes a core body and a sealing part disposed on the outer periphery of the core body. The valve cavity includes a first cavity section, a second cavity section and a third cavity section with gradually increasing inner diameter. The first cavity section is connected to the liquid outlet, the second cavity section is connected to the first flow channel, and the third cavity section is connected to the second flow channel. At least a portion of the sealing part always engages with the cavity wall of the second cavity, and at least a portion of the valve core always engages with the cavity wall of the first cavity.

2. The buffered active cartridge valve and control circuit according to claim 1, characterized in that, The active cartridge valve also includes a valve sleeve, which is fitted onto the valve core and is used to seal the valve core and the valve body.

3. The buffered active cartridge valve and control circuit according to claim 1, characterized in that, It also includes an oil tank, a control valve, and a branch assembly. The control valve is disposed on the branch assembly, and the oil tank is connected to the first flow channel and the second flow channel respectively through the control valve.

4. The buffered active cartridge valve and control circuit according to claim 3, characterized in that, It also includes a variable diameter flow channel, which is disposed on the branch assembly, and the left position of the control valve is connected to the second flow channel through the variable diameter flow channel.

5. The buffered active cartridge valve and control circuit according to claim 4, characterized in that, It also includes a one-way valve device, wherein the variable diameter flow channel and the one-way valve device are connected in parallel on the branch assembly, and the right position of the control valve is connected to the second flow channel through the one-way valve device.

6. The buffered active cartridge valve and control circuit according to claim 1, characterized in that, It also includes an elastic element connected to the valve core and located on the movement path of the valve core from the first position to the second position, for pressing against the valve core; and / or It also includes multiple seals, which are located on the contact surfaces of the valve core and the valve body, respectively.

7. The buffered active cartridge valve and control circuit according to claim 6, characterized in that, The valve housing includes a first housing and a second housing, the first housing being disposed on the second housing, and the first housing and the second housing together forming the valve cavity.

8. A die-casting machine, characterized in that, include: The buffered active cartridge valve and control circuit according to any one of claims 1 to 7.

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