A double-cylinder supercharging structure and control method

Abstract

The present invention discloses a double-cylinder supercharging structure and a control method. The double-cylinder supercharging structure includes an accumulator, a first supercharging oil cylinder, a second supercharging oil cylinder, a shot sleeve oil cylinder, and an oil tank; the first supercharging oil cylinder and the second supercharging oil cylinder are respectively connected to the shot sleeve oil cylinder; the rodless chambers and the rod chambers of the first supercharging oil cylinder and the second supercharging oil cylinder are interconnected through hydraulic pipelines; the first supercharging oil cylinder and the second supercharging oil cylinder are synchronously controlled through a double-cylinder valve group. The technical solution of the present invention uses two smaller supercharging oil cylinders in parallel to replace a larger supercharging oil cylinder in the prior art, reducing the mass of the supercharging piston and the hydraulic shock during the supercharging action. The two small oil cylinders are synchronously controlled by two oil valves, with a larger flow rate and faster response. It can not only improve the shot sleeve performance and the yield rate of products, but also has a more flexible and compact layout.

Description

Technical Field

[0001] The present invention relates to the field of die-casting equipment, and particularly to a dual-cylinder supercharging structure and a control method therefor. Background Art

[0002] In the die-casting industry, most die-cast products require a relatively high casting pressure for forming, which is generally higher than the system pressure of the die-casting machine. Directly increasing the system pressure requires configuring a pump group with a higher pressure and seals with a higher pressure resistance rating, etc., which will greatly increase the overall cost of the die-casting machine and often result in more losses than gains. Currently, a relatively common practice in the industry is to configure a supercharging oil cylinder on the basis of not increasing the system pressure of the die-casting machine, and to meet the casting pressure required by the product through supercharging. However, as the tonnage of the die-casting machine increases, the amount of oil to be supplemented for supercharging increases, and the sizes of the supercharging oil cylinder and the supercharging piston will continue to increase. For large-tonnage die-casting machines, using a single supercharging oil cylinder for supercharging, the size and mass of the supercharging piston are too large, resulting in a large hydraulic shock during the supercharging operation, and a larger-diameter oil valve is required for control, resulting in a slow action response. In addition, the over-large external dimension of the supercharging oil cylinder often affects the layout structure of the valve plate and the overall aesthetics and coordination. Summary of the Invention

[0003] The purpose of the present invention is to provide a dual-cylinder supercharging structure and a control method therefor to solve the problems existing in the prior art. To achieve the above purpose, the technical solution of the present invention provides a dual-cylinder supercharging structure including an accumulator, a first supercharging oil cylinder, a second supercharging oil cylinder, a shot cylinder, and an oil tank; the accumulator, the first supercharging oil cylinder, the second supercharging oil cylinder, and the shot cylinder are connected to the oil tank through hydraulic pipelines; the first supercharging oil cylinder and the second supercharging oil cylinder are respectively connected to the shot cylinder; the rodless chambers and the rod chambers of the first supercharging oil cylinder and the second supercharging oil cylinder are interconnected through hydraulic pipelines; the first supercharging oil cylinder and the second supercharging oil cylinder are synchronously controlled through a dual-cylinder valve group; and the shot cylinder is controlled through a shot valve group.

[0004] As one of the preferred solutions, the first supercharging oil cylinder and the second supercharging oil cylinder are connected to the shot cylinder through a supercharging valve plate; the supercharging valve plate is provided with a first channel, a second channel, and a third channel, which are interconnected with each other, wherein the piston rods of the first supercharging oil cylinder and the second supercharging oil cylinder are movably connected to the third channel and the second channel through seals, and the first channel is connected to the rodless chamber of the shot cylinder.

[0005] As one of the preferred solutions, the accumulator is a piston accumulator, and the accumulator is also connected with an auxiliary gas cylinder for pressure supplement when the accumulator is working; there are two hydraulic pipelines arranged between the accumulator and the fuel tank, namely the oil inlet pipeline and the oil return pipeline; an energy storage valve and an oil pump motor are arranged on the oil inlet pipeline; an accumulator unloading valve is arranged on the oil return pipeline; an energy storage pilot valve connected to the energy storage valve and a suction oil filter located between the oil pump motor and the fuel tank are also arranged on the oil inlet pipeline.

[0006] As one of the preferred solutions, a pilot oil shuttle valve for comparing the pressures of the oil supply from the oil pump and the accumulator is also arranged on the oil inlet pipeline. One end of the pilot oil shuttle valve is connected to the accumulator, and the other end is connected to the oil inlet pipeline between the oil pump motor and the energy storage valve for comparing the magnitudes of the pressures of the oil supply from the oil pump and the accumulator.

[0007] As one of the preferred solutions, the double-cylinder valve group includes a first booster valve, a second booster valve, a booster return valve for resetting, a booster check valve for resetting, and a booster proportional valve; the first booster valve is arranged on the hydraulic pipeline between the accumulator and the rodless cavity of the first booster cylinder; the second booster valve is arranged on the hydraulic pipeline between the accumulator and the rodless cavity of the second booster cylinder; the booster return valve for resetting is arranged on the hydraulic pipeline between the rodless cavities of the first booster cylinder and the second booster cylinder and the fuel tank; the booster check valve for resetting is arranged on the hydraulic pipeline between the accumulator and the rodless cavities of the first booster cylinder and the second booster cylinder; the booster proportional valve is arranged on the hydraulic pipeline between the rodless cavities of the first booster cylinder and the second booster cylinder and the fuel tank.

[0008] As one of the preferred solutions, the double-cylinder valve group further includes any one or more of a booster pilot valve connected to the first booster valve and the second booster valve; a booster return pilot valve connected to the booster return valve for resetting; and a booster pilot accumulator connected to the booster proportional valve to provide pilot control oil fluid.

[0009] As one of the preferred solutions, the injection valve group includes a quick proportional valve, a high-pressure isolation valve, a post-hammer oil return valve, a differential check valve, a quick exhaust proportional valve, and a post-hammer valve; a quick proportional valve is arranged on the hydraulic pipeline between the rodless cavity of the injection cylinder and the accumulator; a high-pressure isolation valve and a post-hammer oil return valve are arranged on the hydraulic pipeline between the rodless cavity of the injection cylinder and the fuel tank; a differential check valve is arranged on the hydraulic pipeline between the rodless cavity of the injection cylinder and the accumulator; a quick exhaust proportional valve is arranged on the hydraulic pipeline between the rodless cavity of the injection cylinder and the fuel tank; a first oil inlet branch pipeline is arranged on the oil inlet pipeline between the oil pump motor and the energy storage valve, the other end of the first oil inlet branch pipeline is connected to the rodless cavity of the injection cylinder, and the post-hammer valve is arranged on the first oil inlet branch pipeline.

[0010] As one of the preferred solutions, the injection valve group further includes a fast pilot accumulator for providing pilot control hydraulic oil for the fast proportional valve; a high-pressure isolation pilot valve connected to the high-pressure isolation valve; a front-hammer pilot valve connected to the post-hammer oil return valve; a fast exhaust pilot accumulator connected to the fast exhaust proportional valve; any one or more of the post-hammer pilot valves connected to the post-hammer valve.

[0011] As one of the preferred solutions, a second inlet oil branch pipeline is further arranged on the inlet oil pipeline between the oil pump motor and the energy storage valve; the other end of the second inlet oil branch pipeline is connected to the pipeline between the high-pressure isolation valve and the post-hammer oil return valve, and a front-hammer valve is arranged on the second inlet oil branch pipeline, and the front-hammer valve is also connected to the front-hammer pilot valve. The technical solution of the present invention provides a control method for a double-cylinder supercharging structure, including the following steps:

[0012] Step 1, system commissioning and accumulator energy storage: Test whether the injection cylinder can work normally through the actions of the front-hammer valve, the post-hammer valve, and the post-hammer oil return valve; after confirming that the injection cylinder is normal, conduct accumulator energy storage confirmation. If the accumulator energy storage is lower than the target value, first perform the energy storage action: The oil pump motor supplies oil, the accumulator unloading valve and the energy storage pilot valve are powered on, the energy storage valve opens, the hydraulic oil enters the accumulator from the oil pump through the energy storage valve, when the accumulator pressure reaches the set value, the energy storage pilot valve loses power, the energy storage valve closes, and the oil pump motor stops supplying oil;

[0013] Step 2, slow injection: The accumulator supplies oil, the accumulator unloading valve, the high-pressure isolation pilot valve, and the fast proportional valve are powered on. At this stage, the opening of the fast proportional valve spool is small, the hydraulic oil enters the rodless cavity of the injection cylinder from the accumulator through the fast proportional valve, the fast exhaust proportional valve is closed, and the hydraulic oil in the rod chamber of the injection cylinder returns to the accumulator through the differential one-way valve, forming a differential circuit;

[0014] Step 3, fast injection: The accumulator supplies oil, the accumulator unloading valve, the high-pressure isolation pilot valve, the fast proportional valve, and the fast exhaust proportional valve are powered on. The opening of the fast proportional valve and the fast exhaust proportional valve spools is large, the hydraulic oil enters the rodless cavity of the injection cylinder from the accumulator through the fast proportional valve, and the hydraulic oil in the rod chamber of the injection cylinder returns to the fuel tank through the fast exhaust proportional valve;

[0015] Step 4, supercharging action: The accumulator supplies oil, the supercharging pilot valve, the supercharging reset pilot valve, the accumulator unloading valve, the supercharging proportional valve, the high-pressure isolation pilot valve, and the fast exhaust proportional valve are powered on, the supercharging reset oil return valve is closed, the first supercharging valve and the second supercharging valve are opened, the hydraulic oil enters the rodless cavities of the first supercharging cylinder and the second supercharging cylinder from the accumulator through the first supercharging valve and the second supercharging valve respectively, the hydraulic oil in the rod chambers of the first supercharging cylinder and the second supercharging cylinder returns to the fuel tank through the supercharging proportional valve, and the hydraulic oil in the rod chamber of the injection cylinder returns to the fuel tank through the fast exhaust proportional valve;

[0016] Step 5, Hammer Follow - out: The accumulator supplies oil. The accumulator unloading valve, high - pressure isolation pilot valve, fast proportional valve, and fast exhaust proportional valve are energized. The oil fluid enters the rodless cavity of the injection cylinder from the accumulator through the fast proportional valve, and the oil fluid in the rod - end cavity of the injection cylinder returns to the fuel tank through the fast exhaust proportional valve.

[0017] Step 6, Boost Reset and Hammer Return: The accumulator supplies oil. The accumulator unloading valve is energized, and the boost reset oil return valve opens. The oil fluid enters the rod - end cavities of the first boost cylinder and the second boost cylinder from the accumulator through the boost reset check valve, and the oil fluid in the rodless cavities of the first boost cylinder and the second boost cylinder returns to the fuel tank through the boost reset oil return valve. At the same time, the oil pump motor supplies oil. The post - hammer pilot valve is energized, and the high - pressure isolation valve, post - hammer oil return valve, and post - hammer valve open. The oil fluid enters the rod - end cavity of the injection cylinder from the oil pump through the post - hammer valve, and the oil fluid in the rodless cavity of the injection cylinder returns to the fuel tank through the high - pressure isolation valve and the post - hammer oil return valve.

[0018] Compared with the existing single - boost - cylinder structure, the boosting method of the double - cylinder structure involved in the present invention replaces a larger boost cylinder with two smaller boost cylinders in parallel, reducing the mass of the boost piston and the hydraulic shock during the boosting action. The two small cylinders are synchronously controlled by two oil valves, with a larger flow rate and faster response. It can not only improve the injection performance and the yield rate of products, but also has a more flexible and compact layout.

[0019] To make the concept, other purposes, advantages, features, and functions of the present invention clearer and easier to understand, preferred embodiments will be specifically cited in the following detailed implementation manners and will be elaborated in detail in conjunction with the accompanying drawings. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic diagram of an embodiment provided by the present invention;

[0022] Figure 2 is a schematic diagram of the principle of the boost valve plate of an embodiment provided by the present invention.

[0023] Among them, the above-mentioned drawings include the following reference numerals: accumulator 1, auxiliary gas cylinder 2, first boosting valve 3, second boosting valve 4, boosting pilot valve 5, first boosting oil cylinder 6, second boosting oil cylinder 7, boosting reset oil return valve 8, boosting reset pilot valve 9, accumulator unloading valve 10, boosting reset check valve 11, boosting proportional valve 12, boosting pilot accumulator 13, high-pressure isolation valve 14, high-pressure isolation pilot valve 15, post-hammer oil return valve 16, manual pre-hammer valve 17, pre-hammer pilot valve 18, fast proportional valve 19, fast pilot accumulator 20, injection oil cylinder 21, differential check valve 22, post-hammer valve 23, post-hammer pilot valve 24, fast exhaust proportional valve 25, fast exhaust pilot accumulator 26, energy storage valve 27, energy storage pilot valve 28, pilot oil shuttle valve 29, oil pump motor 30, oil suction filter 31, fuel tank 32, boosting valve plate Z. Detailed implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0025] As shown in the attach Figure 1 ment, a double-cylinder boosting structure includes an accumulator 1, a first boosting oil cylinder 6, a second boosting oil cylinder 7, an injection oil cylinder 21, and a fuel tank 32.

[0026] The accumulator 1, the first boosting oil cylinder 6, the second boosting oil cylinder 7, and the injection oil cylinder 21 are connected to the fuel tank 32 through hydraulic pipelines.

[0027] As shown in the attach Figure 2 ment, the first boosting oil cylinder 6 and the second boosting oil cylinder 7 are connected to the injection oil cylinder 21 through the boosting valve plate Z, and the first boosting oil cylinder 6 and the second boosting oil cylinder 7 are synchronously controlled through a double-cylinder valve group.

[0028] The boosting valve plate Z is provided with a first channel Z1, a second channel Z2, and a third channel Z3, which are interconnected with each other. The piston rods of the first boosting oil cylinder 6 and the second boosting oil cylinder 7 are movably connected to the third channel Z3 and the second channel Z2 through seals, and the first channel Z1 is connected to the rodless cavity of the injection oil cylinder 21.

[0029] During the boosting operation, the piston rods of the first boosting oil cylinder 6 and the second boosting oil cylinder 7 extend into the third channel Z3 and the second channel Z2, compressing the hydraulic oil in the boosting valve plate Z, thereby increasing the pressure of the hydraulic oil in the rodless cavity of the injection oil cylinder 21.

[0030] The accumulator 1 is a piston accumulator. An auxiliary gas cylinder 2 connected to the accumulator 1 is also provided for pressure supplementation of the accumulator 1 during operation.

[0031] There are two hydraulic pipelines arranged between the accumulator 1 and the fuel tank 32, namely the oil inlet pipeline and the oil return pipeline.

[0032] An energy storage valve 27 and an oil pump motor 30 are arranged on the oil inlet pipeline. An energy storage pilot valve 28 connected to the energy storage valve 27 is also provided, and an oil suction filter 31 is located between the oil pump motor 30 and the fuel tank 32.

[0033] A pilot oil shuttle valve 29 for comparing the pressures of the oil supply from the oil pump and the accumulator is also arranged on the oil inlet pipeline. One end of the pilot oil shuttle valve 29 is connected to the accumulator 1, and the other end is connected to the oil inlet pipeline between the oil pump motor 30 and the energy storage valve 27 for comparing the pressure magnitudes of the oil supply from the oil pump 30 and the accumulator 1. The pilot oil shuttle valve 29 mainly functions to monitor the oil pressure of each pilot valve and can prevent misoperation of the oil valve caused by the pressure of the accumulator 1 being lower than the preset pressure.

[0034] An accumulator unloading valve 10 is arranged on the oil return pipeline.

[0035] During operation, if the pressure in the accumulator 1 is lower than the target value, the oil pump motor 30 supplies oil, the accumulator unloading valve 10 and the energy storage pilot valve 28 are energized, the energy storage valve 27 opens, and the oil fluid enters the accumulator 1 through the action of the oil pump motor 30 via the energy storage valve 27. When the pressure of the accumulator 1 reaches the set value, the energy storage pilot valve 28 is de-energized, the energy storage valve 27 closes, and the oil pump motor 30 stops supplying oil.

[0036] The rodless chambers and rod chambers of the first boosting oil cylinder 6 and the second boosting oil cylinder 7 are interconnected through hydraulic pipelines.

[0037] The double-cylinder valve group includes a first boosting valve 3, a second boosting valve 4, a boosting reset oil return valve 8, a boosting reset check valve 11, and a boosting proportional valve 12.

[0038] The first boosting valve 3 is arranged on the hydraulic pipeline between the accumulator 1 and the rodless chamber of the first boosting oil cylinder 6.

[0039] The second boosting valve 4 is arranged on the hydraulic pipeline between the accumulator 1 and the rodless chamber of the second boosting oil cylinder 7.

[0040] The boosting reset oil return valve 8 is arranged on the hydraulic pipeline between the rodless chambers of the first boosting oil cylinder 6 and the second boosting oil cylinder 7 and the fuel tank 32.

[0041] The boosting reset check valve 11 is arranged on the hydraulic pipeline between the accumulator 1 and the rod chambers of the first boosting oil cylinder 6 and the second boosting oil cylinder 7.

[0042] The pressure boosting proportional valve 12 is arranged on the hydraulic pipeline between the rodless cavities of the first pressure boosting oil cylinder 6 and the second pressure boosting oil cylinder 7 and the oil tank 32.

[0043] The double-cylinder valve group further includes a pressure boosting pilot valve 5 connected to the first pressure boosting valve 3 and the second pressure boosting valve 4; a pressure boosting reset pilot valve 9 connected to the pressure boosting reset oil return valve 8; and a pressure boosting pilot accumulator 13 connected to the pressure boosting proportional valve 12 to provide pilot control oil for it.

[0044] During the pressure boosting action, the first pressure boosting valve 3 and the second pressure boosting valve 4 are synchronously opened by controlling the pressure boosting pilot valve 5, and then the rodless cavities of the first pressure boosting oil cylinder 6 and the second pressure boosting oil cylinder 7 are synchronously filled with oil; the rod cavities of the first pressure boosting oil cylinder 6 and the second pressure boosting oil cylinder 7 are synchronously returned by controlling the pressure boosting proportional valve 12. Moreover, the rodless cavity of the first pressure boosting oil cylinder 6 is communicated with the rodless cavity of the second pressure boosting oil cylinder 7, and the rod cavity of the first pressure boosting oil cylinder 6 is communicated with the rod cavity of the second pressure boosting oil cylinder 7, ensuring that the pressures of the rodless cavities of the two pressure boosting oil cylinders are equal and the pressures of the rod cavities are also equal, and then ensuring that the two pressure boosting oil cylinders move forward synchronously. Similarly, during the pressure boosting reset action, the two pressure boosting oil cylinders move backward synchronously.

[0045] A quick proportional valve 19 is arranged on the hydraulic pipeline between the rodless cavity of the injection cylinder 21 and the accumulator 1. A quick pilot accumulator 20 is also arranged to provide pilot control oil for the quick proportional valve 19.

[0046] A high-pressure isolation valve 14 and a post-hammer oil return valve 16 are arranged on the hydraulic pipeline between the rodless cavity of the injection cylinder 21 and the oil tank 32. A high-pressure isolation pilot valve 15 connected to the high-pressure isolation valve 14 and a pre-hammer pilot valve 18 connected to the post-hammer oil return valve 16 are also arranged.

[0047] A differential check valve 22 is arranged on the hydraulic pipeline between the rod cavity of the injection cylinder 21 and the accumulator 1.

[0048] A quick exhaust proportional valve 25 is arranged on the hydraulic pipeline between the rod cavity of the injection cylinder 21 and the oil tank 32. A quick exhaust pilot accumulator 26 is also arranged, and the quick exhaust pilot accumulator 26 is connected to the quick exhaust proportional valve 25 to provide pilot control oil for it.

[0049] A first oil inlet branch pipeline and a second oil inlet branch pipeline are arranged on the oil inlet pipeline between the oil pump motor 30 and the energy storage valve 27.

[0050] The other end of the first oil inlet branch pipeline is connected to the rod cavity of the injection cylinder 21. A post-hammer valve 23 is arranged on the first oil inlet branch pipeline, and the post-hammer valve 23 is also connected to a post-hammer pilot valve 24.

[0051] The other end of the second oil inlet branch pipeline is connected to the hydraulic pipeline between the high-pressure isolation valve 14 and the post-hammer oil return valve 16. A pre-hammer valve 17 is arranged on the second oil inlet branch pipeline, and the pre-hammer valve 17 is also connected to the pre-hammer pilot valve 18.

[0052] The first oil inlet branch pipeline and the second oil inlet branch pipeline are used in the commissioning stage. After the machine assembly is completed, commissioning work needs to be carried out. The accumulator 1 usually has not stored energy yet. Therefore, the pre-hammer valve 17, the post-hammer valve 23, and the post-hammer oil return valve 16 are required to test whether the injection cylinder can work normally. Since the oil pressure in the rodless cavity of the injection cylinder is relatively high during the boosting action, and the maximum pressure is greater than the maximum working pressure of the pre-hammer valve 17 and the post-hammer oil return valve 16, the high-pressure isolation valve 14 is needed to protect the pre-hammer valve 17 and the post-hammer oil return valve 16 to prevent oil valve failures.

[0053] The control method of a double-cylinder boosting structure according to the present invention includes the following steps:

[0054] Step 1: Before using the equipment, perform the commissioning operation described above. After that, when preparing for injection, confirm the energy storage of the accumulator. If it is lower than the target value, first perform the energy storage action: The oil pump motor 30 supplies oil, the accumulator unloading valve 10 and the energy storage pilot valve 28 are powered on, the energy storage valve 27 is opened, the oil fluid enters the accumulator 1 from the oil pump through the energy storage valve 27. When the pressure of the accumulator 1 reaches the set value, the energy storage pilot valve 28 is powered off, the energy storage valve 27 is closed, and the oil pump motor 30 stops supplying oil;

[0055] Step 2: Slow injection: The accumulator 1 supplies oil, the accumulator unloading valve 10, the high-pressure isolation pilot valve 15, and the quick proportional valve 19 are powered on. At this stage, the opening of the quick proportional valve 19 spool is small. The oil fluid enters the rodless cavity of the injection cylinder 21 from the accumulator 1 through the quick proportional valve 19. The quick exhaust proportional valve 25 is closed, and the oil fluid in the rod chamber of the injection cylinder 21 returns to the accumulator 1 through the differential check valve 22 to form a differential circuit to reduce the energy consumption of the accumulator;

[0056] Step 3: Fast injection: The accumulator 1 supplies oil, the accumulator unloading valve 10, the high-pressure isolation pilot valve 15, the quick proportional valve 19, and the quick exhaust proportional valve 25 are powered on. The opening of the quick proportional valve 19 and the quick exhaust proportional valve 25 spools is large. The oil fluid enters the rodless cavity of the injection cylinder 21 from the accumulator 1 through the quick proportional valve 19. The oil fluid in the rod chamber of the injection cylinder 21 returns to the fuel tank 32 through the quick exhaust proportional valve 25;

[0057] Step 4, Boosting Action: The accumulator 1 supplies oil. The boost pilot valve 5, boost reset pilot valve 9, accumulator unloading valve 10, boost proportional valve 12, high-pressure isolation pilot valve 15, and quick exhaust proportional valve 25 are energized. The boost reset oil return valve 8 is closed. The first boost valve 3 and the second boost valve 4 are opened. The oil flows from the accumulator 1 through the first boost valve 3 and the second boost valve 4 into the rodless chambers of the first boost cylinder 6 and the second boost cylinder 7 respectively. The oil in the rod chambers of the first boost cylinder 6 and the second boost cylinder 7 returns to the oil tank 32 through the boost proportional valve 12. The oil in the rod chamber of the injection cylinder 21 returns to the oil tank through the quick exhaust proportional valve 25;

[0058] Step 5, Hammer Follow-out: The accumulator 1 supplies oil. The accumulator unloading valve 10, high-pressure isolation pilot valve 15, quick proportional valve 19, and quick exhaust proportional valve 25 are energized. The oil flows from the accumulator 1 through the quick proportional valve 19 into the rodless chamber of the injection cylinder 21. The oil in the rod chamber of the injection cylinder 21 returns to the oil tank 32 through the quick exhaust proportional valve 25;

[0059] Step 6, Boost Reset and Hammer Return: The accumulator 1 supplies oil. The accumulator unloading valve 10 is energized. The boost reset oil return valve 8 is opened. The oil flows from the accumulator 1 through the boost reset check valve 11 into the rod chambers of the first boost cylinder 6 and the second boost cylinder 7. The oil in the rodless chambers of the first boost cylinder 6 and the second boost cylinder 7 returns to the oil tank 32 through the boost reset oil return valve 8; At the same time, the oil pump motor 30 supplies oil. The post-hammer pilot valve 24 is energized. The high-pressure isolation valve 14, post-hammer oil return valve 16, and post-hammer valve 23 are opened. The oil flows from the oil pump through the post-hammer valve 23 into the rod chamber of the injection cylinder 21. The oil in the rodless chamber of the injection cylinder 21 returns to the oil tank 32 through the high-pressure isolation valve 14 and the post-hammer oil return valve 16.

[0060] The above first boost valve 3, second boost valve 4, boost reset oil return valve 8, post-hammer oil return valve 16, manual pre-hammer valve 17, differential check valve 22, energy storage valve 27, high-pressure isolation valve 14, post-hammer valve 23 are two-way cartridge valves; The boost pilot valve 5, boost reset pilot valve 9, pre-hammer pilot valve 18, post-hammer pilot valve 24, energy storage pilot valve 28 are electromagnetic directional valves; The boost proportional valve 12, quick proportional valve 19, quick exhaust proportional valve 25 are proportional throttle valves; The accumulator unloading valve 10 is a screw-in type electromagnetic directional valve; The boost reset check valve 11 is an adjustable two-way cartridge valve; The high-pressure isolation pilot valve 15 is a high-pressure solenoid seat valve.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] It should be noted that, unless otherwise clearly specified and defined, terms such as "install", "connect", "join", "fix", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] Certain terms will be used in the description and claims of the present invention to refer to specific elements. Those of ordinary skill in the art should understand that manufacturers may use different names to refer to the same component. This document is not intended to distinguish components with the same function but different names. In the following description and claims, words such as "comprise", "have" and "include" are open-ended words, and thus should be interpreted as "including but not limited to...".

[0064] In addition, it should be noted that in the description of the present invention, the use of words such as "first" and "second" to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus cannot be understood as limiting the protection scope of the present application. In the description of the present invention, unless otherwise stated, the meaning of "a plurality of" refers to two or more.

[0065] The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A two-cylinder supercharging structure, characterized in that, It includes an accumulator, a first boosting oil cylinder, a second boosting oil cylinder, a shot sleeve oil cylinder, and an oil tank; the accumulator, the first boosting oil cylinder, the second boosting oil cylinder, and the shot sleeve oil cylinder are connected to the oil tank through hydraulic pipelines; the first boosting oil cylinder and the second boosting oil cylinder are respectively connected to the shot sleeve oil cylinder; the rodless chambers and the rod chambers of the first boosting oil cylinder and the second boosting oil cylinder are interconnected through hydraulic pipelines; the first boosting oil cylinder and the second boosting oil cylinder are synchronously controlled through a double-cylinder valve group; the shot sleeve oil cylinder is controlled through a shot sleeve valve group; the double-cylinder valve group includes a first boosting valve, a second boosting valve, a boosting reset oil return valve, a boosting reset check valve, and a boosting proportional valve; the first boosting valve is arranged on the hydraulic pipeline between the accumulator and the rodless chamber of the first boosting oil cylinder; the second boosting valve is arranged on the hydraulic pipeline between the accumulator and the rodless chamber of the second boosting oil cylinder; the boosting reset oil return valve is arranged on the hydraulic pipeline between the rodless chambers of the first boosting oil cylinder and the second boosting oil cylinder and the oil tank; the boosting reset check valve is arranged on the hydraulic pipeline between the accumulator and the rod chambers of the first boosting oil cylinder and the second boosting oil cylinder; the boosting proportional valve is arranged on the hydraulic pipeline between the rod chambers of the first boosting oil cylinder and the second boosting oil cylinder and the oil tank.

2. The double-cylinder supercharging structure according to claim 1, wherein the first boosting oil cylinder and the second boosting oil cylinder are connected to the shot sleeve oil cylinder through a boosting valve plate; the boosting valve plate is provided with a first channel, a second channel, and a third channel, which are interconnected with each other, wherein the piston rods of the first boosting oil cylinder and the second boosting oil cylinder are movably connected to the third channel and the second channel through seals, and the first channel is connected to the rodless chamber of the shot sleeve oil cylinder.

3. The double-cylinder supercharging structure according to claim 1, characterized in that, the accumulator is a piston accumulator, and the accumulator is also connected with an auxiliary gas cylinder for pressure supplement during the operation of the accumulator; two hydraulic pipelines are arranged between the accumulator and the oil tank, namely an oil inlet pipeline and an oil return pipeline; an energy storage valve and an oil pump motor are arranged on the oil inlet pipeline; an accumulator unloading valve is arranged on the oil return pipeline; the oil inlet pipeline is also provided with an energy storage pilot valve connected to the energy storage valve and a suction oil filter located between the oil pump motor and the oil tank.

4. The double-cylinder supercharging structure according to claim 3, wherein, a pilot oil shuttle valve for comparing the pressure of the oil supply from the oil pump and the oil supply from the accumulator is also arranged on the oil inlet pipeline, and one end of the pilot oil shuttle valve is connected to the accumulator, and the other end is connected to the oil inlet pipeline between the oil pump motor and the energy storage valve for comparing the pressure magnitudes of the oil supply from the oil pump and the oil supply from the accumulator.

5. The double-cylinder supercharging structure according to claim 1, characterized in that, the double-cylinder valve group also includes any one or more of a boosting pilot valve connected to the first boosting valve and the second boosting valve; a boosting reset pilot valve connected to the boosting reset oil return valve; and a boosting pilot accumulator connected to the boosting proportional valve to provide pilot control oil fluid.

6. The double-cylinder supercharging structure according to claim 3, characterized in that, The injection valve group includes a quick proportional valve, a high-pressure isolation valve, a post-hammer oil return valve, a differential one-way valve, a quick exhaust proportional valve, and a post-hammer valve; a quick proportional valve is provided on the hydraulic pipeline between the rodless cavity of the injection cylinder and the accumulator; a high-pressure isolation valve and a post-hammer oil return valve are provided on the hydraulic pipeline between the rodless cavity of the injection cylinder and the oil tank; a differential one-way valve is provided on the hydraulic pipeline between the rod end cavity of the injection cylinder and the accumulator; a quick exhaust proportional valve is provided on the hydraulic pipeline between the rod end cavity of the injection cylinder and the oil tank; A first oil inlet branch pipeline is provided on the oil inlet pipeline between the oil pump motor and the energy storage valve, the other end of the first oil inlet branch pipeline is connected to the rod end cavity of the injection cylinder, and the post-hammer valve is provided on the first oil inlet branch pipeline.

7. The dual-cylinder supercharging structure according to claim 6, characterized in that, The injection valve group further includes any one or any combination of a quick pilot accumulator that provides pilot control oil for the quick proportional valve; a high-pressure isolation pilot valve connected to the high-pressure isolation valve; a pre-hammer pilot valve connected to the post-hammer oil return valve; a quick exhaust pilot accumulator connected to the quick exhaust proportional valve; and a post-hammer pilot valve connected to the post-hammer valve.

8. The dual-cylinder supercharging structure according to claim 6, wherein, A second oil inlet branch pipeline is further provided on the oil inlet pipeline between the oil pump motor and the energy storage valve; the other end of the second oil inlet branch pipeline is connected to the pipeline between the high-pressure isolation valve and the post-hammer oil return valve, a pre-hammer valve is provided on the second oil inlet branch pipeline, and the pre-hammer valve is also connected to the pre-hammer pilot valve.

9. A control method for the double-cylinder supercharging structure according to any one of claims 1 to 8, characterized in that, The control method includes the following steps: Step 1, system debugging and accumulator energy storage: Test whether the injection cylinder can work normally through the actions of the pre-hammer valve, the post-hammer valve, and the post-hammer oil return valve; after confirming that the injection cylinder is normal, conduct accumulator energy storage confirmation. If the accumulator energy storage is lower than the target value, first perform the energy storage action: The oil pump motor supplies oil, the accumulator unloading valve and the energy storage pilot valve are energized, the energy storage valve opens, the oil fluid enters the accumulator from the oil pump through the energy storage valve, when the accumulator pressure reaches the set value, the energy storage pilot valve is de-energized, the energy storage valve closes, and the oil pump motor stops supplying oil; Step 2, slow injection: The accumulator supplies oil, the accumulator unloading valve, the high-pressure isolation pilot valve, and the quick proportional valve are energized. At this stage, the opening of the quick proportional valve spool is small, the oil fluid enters the rodless cavity of the injection cylinder from the accumulator through the quick proportional valve, the quick exhaust proportional valve is closed, and the oil fluid in the rod end cavity of the injection cylinder returns to the accumulator through the differential one-way valve, forming a differential circuit; Step 3, fast injection: The accumulator supplies oil, the accumulator unloading valve, the high-pressure isolation pilot valve, the quick proportional valve, and the quick exhaust proportional valve are energized. The openings of the quick proportional valve and the quick exhaust proportional valve spools are large, the oil fluid enters the rodless cavity of the injection cylinder from the accumulator through the quick proportional valve, and the oil fluid in the rod end cavity of the injection cylinder returns to the oil tank through the quick exhaust proportional valve; Step 4, Boosting action: The accumulator supplies oil, the boost pilot valve, boost reset pilot valve, accumulator unloading valve, high-pressure isolation pilot valve of the boost proportional valve, and quick exhaust proportional valve are energized, the boost reset oil return valve is closed, the first boost valve and the second boost valve are opened, the oil fluid enters the rodless chambers of the first boost cylinder and the second boost cylinder from the accumulator through the first boost valve and the second boost valve respectively, the oil fluid in the rod chambers of the first boost cylinder and the second boost cylinder returns to the fuel tank through the boost proportional valve, and the oil fluid in the rod chamber of the injection cylinder returns to the fuel tank through the quick exhaust proportional valve; Step 5, Hammer following out: The accumulator supplies oil, the accumulator unloading valve, high-pressure isolation pilot valve, quick proportional valve, and quick exhaust proportional valve are energized, the oil fluid enters the rodless chamber of the injection cylinder from the accumulator through the quick proportional valve, and the oil fluid in the rod chamber of the injection cylinder returns to the fuel tank through the quick exhaust proportional valve; Step 6, Boost reset and hammer return: The accumulator supplies oil, the accumulator unloading valve is energized, the boost reset oil return valve is opened, the oil fluid enters the rod chambers of the first boost cylinder and the second boost cylinder from the accumulator through the boost reset check valve, and the oil fluid in the rodless chambers of the first boost cylinder and the second boost cylinder returns to the fuel tank through the boost reset oil return valve; At the same time, the oil pump motor supplies oil, the post-hammer pilot valve is energized, the high-pressure isolation valve, post-hammer oil return valve, and post-hammer valve are opened, the oil fluid enters the rod chamber of the injection cylinder from the oil pump through the post-hammer valve, and the oil fluid in the rodless chamber of the injection cylinder returns to the fuel tank through the high-pressure isolation valve and the post-hammer oil return valve.

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