Double-pressurization type gas-liquid pressurization cylinder and control method thereof

Abstract

The invention discloses a double-pressurization type gas-liquid pressurization cylinder and a control method thereof. The pressurization cylinder comprises a high-pressure process cavity, a high-pressure return stroke cavity, a pressurization process cavity, a pressurization return stroke cavity, a process oil storage device, a return stroke high-pressure oil cylinder barrel, a return stroke pressurization cavity and a return stroke oil storage device. The forward and return pressurizing cavities are connected with the corresponding high-pressure cavities and oil storage devices to form independent pressurizing loops; each cavity is provided with a plurality of specific air ports, and the corresponding pressurizing pistons are driven to act by controlling on-off of air channels. According to the double-pressurizing type gas-liquid pressurizing cylinder and the control method thereof, the pressurizing cylinder can pressurize at the descending tail end and can actively pressurize hydraulic oil at the return stroke initial end, so that strong and stable return stroke starting force is provided, and workpiece adhesion is effectively overcome. The overall structure is compact, operation is reliable, and control is easy.

Description

Technical Field

[0001] This invention relates to the technical field of booster cylinders, specifically a dual-boost type gas-liquid booster cylinder and its control method. Background Technology

[0002] Pneumatic-hydraulic booster cylinders combine the advantages of rapid pneumatic transmission and high-power hydraulic transmission, and are widely used in industrial applications requiring large output forces, such as stamping, forming, and riveting. Conventional pneumatic-hydraulic booster cylinders typically only activate the boosting mechanism at the end of the working stroke, such as the downward stroke, when encountering significant resistance, to obtain a larger output pressure. However, in certain specific conditions, such as after die stamping, the upper die and workpiece or lower die may be tightly fitted due to material deformation, vacuum adsorption, or friction. In this case, a very large pulling force is required in the initial stage of the return stroke to separate the die. Ordinary booster cylinders usually do not have a boosting function during the return stroke, relying only on the original air pressure of the cylinder section. Their return pulling force is limited and cannot meet such high pulling force requirements, which may lead to equipment failure to reset smoothly or low efficiency.

[0003] In existing technologies, several solutions exist to address the problem of insufficient return force, such as adding an additional cylinder in parallel to the booster cylinder to assist the return stroke, or employing a complex multi-stage booster structure. However, these solutions often result in a complex system structure, increased size, cumbersome control, and increased manufacturing costs and maintenance difficulties. Furthermore, the return stroke of some booster cylinders is still directly driven by compressed air, which, due to the compressibility of air, leads to poor motion smoothness and low control precision.

[0004] Therefore, the aforementioned technical problems need to be solved. Summary of the Invention

[0005] To address the above-mentioned technical problems, this invention provides a dual-pressure type gas-liquid booster cylinder and its control method, which can not only boost pressure at the end of descent but also actively boost pressure at the beginning of return stroke, thereby providing a stable and powerful return stroke force; moreover, it has a compact structure, stable and reliable operation, and is easy to control.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A dual-boost type gas-liquid booster cylinder includes a high-pressure oil cylinder and a process booster cylinder coaxially connected by a middle cover, a return high-pressure oil cylinder and a return booster cylinder coaxially connected by a return booster front cover, as well as a process oil storage device and a return oil storage device.

[0008] The high-pressure cylinder is equipped with a high-pressure piston, which forms a high-pressure process chamber and a high-pressure return chamber. An output piston rod is connected to the high-pressure piston.

[0009] The process booster cylinder is equipped with a process booster piston, and a process booster rod is connected to the process booster piston. Its free end extends into the high-pressure process chamber through the middle cover. The process oil storage device is connected to the high-pressure process chamber.

[0010] The return booster cylinder is equipped with a return booster piston, and a return booster rod is connected to the return booster piston. Its free end extends into the return high-pressure cylinder through the return booster front cover. The high-pressure return chamber pipeline is connected to the return high-pressure cylinder.

[0011] The in-process booster cylinder and the return booster cylinder are connected to a high-pressure air source;

[0012] It also includes a control system, which controls the on / off of the high-pressure air source to achieve different actions of the booster cylinder.

[0013] This dual-boost pneumatic-hydraulic booster cylinder actively boosts the hydraulic oil during the initial return phase by boosting the independent return high-pressure cylinder and return booster chamber. This effectively solves the problem of difficult separation after the mold is tightly fitted, expanding the application scenarios of the booster cylinder. The inclusion of a process oil reservoir and a return oil reservoir ensures that the booster cylinder relies on liquid (hydraulic oil) to drive the high-pressure piston during the process or return phase, rather than relying on gas (compressed air). This is because compressed air is compressible, while hydraulic oil is incompressible. Therefore, relying on compressed air to drive the piston is not as smooth and reliable as relying on hydraulic pressure, and the latter is easier to control and has a damping effect.

[0014] In a further optimized design, the process boosting cylinder is equipped with a process boosting piston, which forms a boosting process chamber and a boosting return chamber.

[0015] In a further optimized design, the return booster cylinder is equipped with a return booster piston, forming a return booster chamber and a return reset chamber.

[0016] In a further optimized design, the lower space of the inner cavity of the return oil storage device is provided with hydraulic oil, and the upper space of the hydraulic oil in the inner cavity of the return oil storage device is provided with a first air cavity; the lower space of the inner cavity of the process oil storage device is provided with hydraulic oil, and the upper space of the hydraulic oil in the inner cavity of the process oil storage device is provided with a second air cavity.

[0017] The first air chamber is provided with an air port A, the second air chamber is provided with an air port B, the pressurization return chamber is provided with an air port C, the pressurization process chamber is provided with an air port D, the return reset chamber is provided with an air port E, and the return pressurization chamber is provided with an air port F.

[0018] In a further optimized design, a high-pressure front cover is provided at one end of the high-pressure cylinder barrel opposite to the middle cover.

[0019] In a further optimized design, a process boosting rear cover is provided at one end of the process boosting cylinder opposite to the middle cover.

[0020] In a further optimized design, a return booster rear cover is provided at one end of the return booster cylinder opposite to the return booster front cover.

[0021] In a further optimized scheme, air ports A and B are respectively connected to a pre-pressure control valve via pipelines, air ports C and D are respectively connected to a process booster control valve via pipelines, and air ports E and F are respectively connected to a return booster control valve via pipelines.

[0022] A control method for a dual-boost type gas-hydraulic booster cylinder, applied to the aforementioned dual-boost type gas-hydraulic booster cylinder, includes the following steps:

[0023] Step 1, Pre-pressurization and forward movement: The air source introduces air into the second air chamber through air port B, while air port A exhausts air. The hydraulic oil in the process oil storage device enters the high-pressure process chamber. The high-pressure piston drives the output piston rod to pre-press forward, and correspondingly, the output piston rod drives the upper mold to move quickly downward to contact the workpiece.

[0024] Step 2, pressurization and forward movement: After the upper die touches the workpiece, air is introduced through port D and air is exhausted through port C. The process pressurization piston drives the process pressurization rod forward, and the process pressurization rod pressurizes the hydraulic oil in the high-pressure process chamber, thereby increasing the pressure and moving the high-pressure piston forward. Correspondingly, the output piston rod drives the upper die to move downward under pressure and close with the lower die.

[0025] Step 3, venting and depressurization: After the mold is closed, air is introduced through port C and vented through port D. The process booster piston drives the process booster rod to return, realizing air intake in the booster return chamber and depressurization in the booster process chamber.

[0026] Step 4, Pressurized Return: The air source supplies air into the first air chamber through port A, while simultaneously venting air through port B. This drives the hydraulic oil in the return oil storage device into the high-pressure return chamber, causing the high-pressure piston to drive the output piston rod back. If the return force of the high-pressure piston is insufficient to pull the upper die away from the lower die, air is supplied through port F, while air is vented through port E. The return booster piston drives the return booster rod forward, which boosts the hydraulic oil in the return high-pressure cylinder. This high-pressure hydraulic oil enters the high-pressure return chamber to achieve the pressurized return of the high-pressure piston. Correspondingly, the output piston rod drives the upper die to separate from the lower die.

[0027] Step 5, return stroke reset: Air is introduced through port E, and air is exhausted through port F. The return stroke booster piston drives the return stroke booster rod to return stroke reset.

[0028] The dual-pressure type gas-liquid booster cylinder and its control method of the present invention have the following technical advantages compared with the prior art:

[0029] 1. Achieved high tensile force output in the initial stage of return stroke: Through the independently set high-pressure return chamber and booster return chamber, the hydraulic oil is actively boosted in the initial stage of return stroke, which effectively solves the problem of difficult separation after the mold is tightly fitted and expands the application scenarios of the booster cylinder.

[0030] 2. Smooth operation and precise control: The return motion of the high-pressure piston is driven by pressurized incompressible hydraulic oil. Compared with direct drive by compressible air, it eliminates crawling and impact phenomena, making the movement more stable and smooth. It is also easy to achieve precise position and speed control, and has a damping buffering effect.

[0031] 3. Compact structure and high integration: The three functional units (cylinder block) of forward boost, main action and return boost are integrated into one design. Compared with the solution of external auxiliary cylinder, it saves installation space, simplifies external pipeline connection and improves system rigidity and reliability.

[0032] 4. Clear logic and simple control: The workflow steps are clearly defined. Complex dual-pressure actions can be achieved by controlling the opening and closing of each air path through conventional solenoid valves, resulting in a high degree of automation integration. Attached Figure Description

[0033] Figure 1 This is a front view of the external shape of a specific embodiment of the dual-boosting gas-liquid booster cylinder of the present invention;

[0034] Figure 2 yes Figure 1 A sectional view;

[0035] Figure 3 yes Figure 1 Gas connection diagram;

[0036] Figure 4 yes Figure 1 The initial state of the booster cylinder during operation;

[0037] Figure 5 yes Figure 1 The depressed state of the booster cylinder during operation;

[0038] Figure 6 yes Figure 1 The pressure boosting state of the booster cylinder during operation;

[0039] Figure 7 yes Figure 1 The return stroke state of the booster cylinder during operation;

[0040] Figure 8 It corresponds Figure 4 Distribution diagram of compressed air and low-pressure oil in the initial state of the booster cylinder;

[0041] Figure 9 It corresponds Figure 5Distribution diagram of compressed air and low-pressure oil under the pressure state of the booster cylinder;

[0042] Figure 10 It corresponds Figure 6 Distribution diagram of compressed air, low-pressure oil and high-pressure oil under the pressure boosting state of the booster cylinder;

[0043] Figure 11 It corresponds Figure 7 Distribution diagram of compressed air, low-pressure oil and high-pressure oil under the pressure boosting state of the booster cylinder.

[0044] In the diagram: High-pressure process chamber 10, high-pressure return chamber 1A, high-pressure piston 11, output piston rod 12, high-pressure front cover 13, high-pressure cylinder 14, middle cover 15, boosting process chamber 20, boosting return chamber 2A, process boosting piston 21, process boosting rod 22, process boosting cylinder 23, process boosting rear cover 24, process oil reservoir 30, second air chamber 31, second pull rod 32, return high-pressure cylinder 41, return... 50, 5A, 51, 52, 53, 54, 55, 60, 61, 62, 71, 72, 73, 84, 85, 86, 87, 88, 89, 80, 80, 81, 82, 83, 84, 85, 86, 89, 80, 80, 81, 82, 83, 84, 85 ... Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0046] like Figures 1 to 3 As shown, this invention provides a specific embodiment of a dual-pressure type gas-liquid booster cylinder.

[0047] like Figure 2 As shown, the dual-boost gas-liquid booster cylinder of this embodiment includes a high-pressure return chamber 1A, a high-pressure process chamber 10, a booster return chamber 2A, and a booster process chamber 20 connected coaxially in sequence. It also includes a process oil storage device 30, a return high-pressure cylinder 41, a return booster chamber 50, a return oil storage device 60, and a control system. The return high-pressure cylinder 41 is connected to and coaxially arranged with the return booster chamber 50. The process oil storage device 30 is connected to the end of the high-pressure process chamber 10 near the booster return chamber 2A through an oil passage plate 83. The high-pressure return chamber 1A is connected to one end of the return high-pressure cylinder 41, and the other end of the return high-pressure cylinder 41 is connected to the return oil storage device 60.

[0048] like Figure 2As shown, in the working state, the lower space of the inner cavity of the return oil storage device 60 is filled with hydraulic oil, and the upper space of the hydraulic oil in the inner cavity of the return oil storage device 60 is provided with a first air cavity 61; the lower space of the inner cavity of the process oil storage device 30 is filled with hydraulic oil, and the upper space of the hydraulic oil in the inner cavity of the process oil storage device 30 is provided with a second air cavity 31.

[0049] like Figure 2 and Figure 3 As shown, the first air chamber 61 is provided with air port A; the second air chamber 31 is provided with air port B; the boosting return chamber 2A is provided with air port C; the boosting process chamber 20 is provided with air port D; the return reset chamber 5A is provided with air port E; and the return boosting chamber 50 is provided with air port F. The control system controls the opening and closing of each air port to achieve different actions of the boosting cylinder.

[0050] This dual-boost pneumatic-hydraulic booster cylinder actively boosts the hydraulic oil during the initial stage of the return stroke by boosting the independent return high-pressure cylinder 41 and the return booster chamber 50. This effectively solves the problem of difficult separation after the mold is tightly fitted, expanding the application scenarios of the booster cylinder. The configuration of the process oil storage device 30 and the return oil storage device 60 ensures that the booster cylinder relies on liquid (hydraulic oil) to drive the high-pressure piston 11 during the process or return stroke, rather than relying on gas (compressed air). This is because compressed air is compressible, while hydraulic oil is incompressible. Therefore, relying on compressed air to drive the piston is not as smooth and reliable as relying on hydraulic pressure, and the latter is easier to control and has a damping effect.

[0051] like Figure 2 and Figure 3 As shown, a high-pressure piston 11 is slidably installed in the high-pressure process chamber 10 and the high-pressure return chamber 1A, with the high-pressure piston 11 spaced apart from the two chambers. An output piston rod 12 is connected to the high-pressure piston 11. Air is introduced into the second air chamber 31 through the B port, driving the hydraulic oil in the process oil storage device 30 into the high-pressure process chamber 10. The high-pressure piston 11 drives the output piston rod 12 to advance under pre-pressure, while air is exhausted through the A port. Air is introduced into the first air chamber 61 through the A port, driving the hydraulic oil in the return oil storage device 60 to enter the high-pressure return chamber 1A through the return high-pressure cylinder 41. The high-pressure piston 11 drives the output piston rod 12 to return, while air is exhausted through the B port.

[0052] like Figure 2 and Figure 3As shown, a process boosting piston 21 is slidably installed in the boosting process chamber 20 and the boosting return chamber 2A, with the process boosting piston 21 spaced apart from the two chambers. A process boosting rod 22 is connected to the process boosting piston 21. When air is introduced through port D, air is exhausted through port C. The process boosting piston 21 drives the process boosting rod 22 forward, and the process boosting rod 22 boosts the hydraulic oil in the high-pressure process chamber 10, thereby boosting the pressure of the high-pressure piston 11. When air is introduced through port C, air is exhausted through port D. The process boosting piston 21 drives the process boosting rod 22 back to the return position, thereby releasing the pressure in the boosting process chamber 20.

[0053] like Figure 2 and Figure 3 As shown, a return booster piston 51 is slidably installed in the return booster chamber 50 and the return reset chamber 5A, with the two chambers spaced apart. A return booster rod 52 is connected to the return booster piston 51. Air is introduced through port F, and air is exhausted through port E. The return booster piston 51 drives the return booster rod 52 forward, and the return booster rod 52 boosts the hydraulic oil in the return high-pressure cylinder 41. This high-pressure hydraulic oil enters the high-pressure return chamber 1A to achieve return boosting of the high-pressure piston 11. Air is introduced through port E, and air is exhausted through port F. The return booster piston 51 drives the return booster rod 52 back, realizing exhaust and depressurization in the return booster chamber 50.

[0054] like Figure 2 As shown, the return oil storage device 60 is equipped with a first pull rod 62. One end of the first pull rod 62 is connected to the A air port by an oil rear screw, and the other end is connected to the inlet and outlet oil ports of the return oil storage device 60 and the return high pressure oil cylinder 41 by an oil front screw. An oil baffle plate 85 is installed on the upper part of the first pull rod 62 to block the hydraulic oil splashed from the lower part and prevent the hydraulic oil from spraying out from the A air port.

[0055] like Figure 2 As shown, the process oil storage device 30 is equipped with a second pull rod 32. One end of the second pull rod 32 is connected to the B air port by an oil post screw, and the other end is connected to the oil inlet and outlet of the process oil storage device 30 connected to the high-pressure process chamber 10 by an oil pre screw. An oil baffle plate 85 is installed on the upper part of the second pull rod 32 to block the hydraulic oil splashed from the lower part and prevent the hydraulic oil from spraying out from the B air port.

[0056] like Figure 1 , Figure 2 and Figure 3 As shown, the high-pressure return chamber 1A, the high-pressure process chamber 10, the boosting return chamber 2A, and the boosting process chamber 20 are formed by the high-pressure front cover 13, the high-pressure cylinder barrel 14, the middle cover 15, the process boosting cylinder barrel 23, and the process boosting rear cover 24 connected in sequence; the C air port is set on the middle cover 15, and the D air port is set on the process boosting rear cover 24.

[0057] like Figure 1 , Figure 2 and Figure 3 As shown, the return reset chamber 5A and the return boost chamber 50 are formed by the return boost front cover 53, the return boost cylinder 54 and the return boost rear cover 55 connected in sequence; the end of the return boost front cover 53 is provided with a return high pressure cylinder 41, and the return high pressure cylinder 41 is connected to the high pressure return chamber 1A through a high pressure oil pipe 84; the E air port is provided on the return boost front cover 53 and the F air port is provided on the return boost rear cover 55.

[0058] like Figure 3 As shown, air ports A and B are respectively connected to pre-pressure control valve 71 via pipelines; air ports C and D are respectively connected to process booster control valve 72 via pipelines; and air ports E and F are respectively connected to return booster control valve 73 via pipelines. Pre-pressure control valve 71, process booster control valve 72, and return booster control valve 73 are all solenoid valves, interconnected by pipelines. These pipelines are also sequentially connected to an air source triplet 82 and an air source 81.

[0059] This invention also discloses a control method for a dual-boost type gas-liquid booster cylinder, applied to the aforementioned dual-boost type gas-liquid booster cylinder, such as... Figure 1 , Figure 2 and Figure 3 As shown, the initial state of the booster cylinder is as follows: Figure 4 and Figure 8 As shown, it includes the following steps:

[0060] Step 1, Pre-compression forward: (e.g.) Figure 5 and Figure 9 As shown, the air source vents into the second air chamber 31 through air port B, while air port A vents the air. The hydraulic oil in the driving process oil storage device 30 enters the high-pressure process chamber 10. The high-pressure piston 11 drives the output piston rod 12 to advance under pre-pressure. Correspondingly, the output piston rod 12 drives the upper mold to move quickly downward and stick to the workpiece.

[0061] Step two, pressurize and move forward: (e.g.) Figure 6 and Figure 10 As shown, after the upper mold touches the workpiece, air is introduced through port D and air is exhausted through port C. The process booster piston 21 drives the process booster rod 22 forward. The process booster rod 22 boosts the hydraulic oil in the high-pressure process chamber 10, thereby boosting the pressure of the high-pressure piston 11 and causing it to advance. Correspondingly, the output piston rod 12 drives the upper mold to move downward under pressure and close with the lower mold.

[0062] Step 3, venting and depressurization: After the mold is closed, air is introduced through the C air port and vented through the D air port. The process booster piston 21 drives the process booster rod 22 to return, so that the booster return chamber 2A is filled with air and the booster process chamber 20 is vented and depressurized.

[0063] Step 4, Pressurized Return: The air source supplies air into the first air chamber 61 through air port A, while air port B supplies exhaust air, driving the hydraulic oil in the return oil storage device 60 into the high-pressure return chamber 1A. The high-pressure piston 11 drives the output piston rod 12 to return. If the return force of the high-pressure piston 11 is insufficient to pull the upper mold off the lower mold, air port F supplies air, while air port E supplies exhaust air. The return booster piston 51 drives the return booster rod 52 forward, boosting the hydraulic oil in the return high-pressure cylinder 41. This high-pressure hydraulic oil enters the high-pressure return chamber 1A to achieve the pressurized return of the high-pressure piston 11. Correspondingly, the output piston rod 12 drives the upper mold to separate from the lower mold.

[0064] Step 5, Return Reset: Air is introduced through port E, and air is exhausted through port F. The return booster piston 51 drives the return booster rod 52 to return to its original position. Figure 4 and Figure 8 As shown.

[0065] This dual-pressure gas-liquid booster cylinder and its control method can not only boost pressure at the end of the descent, but also actively boost pressure at the beginning of the return stroke, thereby providing a stable and powerful return pull; it also has a compact structure, stable and reliable operation, and simple control.

[0066] In summary, as described in the specification and figures, this invention has been manufactured into actual samples and tested multiple times. The test results demonstrate that the invention achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of the invention. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this invention without departing from the scope of the technical features and similar features of this invention, based on partial modifications or alterations, are within the protection scope of this invention.

Claims

1. A dual-pressure type gas-liquid booster cylinder, characterized in that: It includes a high-pressure cylinder barrel (14) and a process booster cylinder barrel (23) coaxially connected by a middle cover (15), a return high-pressure cylinder barrel (41) and a return booster cylinder barrel (54) coaxially connected by a return booster front cover (53), as well as a process oil storage device (30) and a return oil storage device (60). The high-pressure cylinder (14) is provided with a high-pressure piston (11), which forms a high-pressure process chamber (10) and a high-pressure return chamber (1A). An output piston rod (12) is connected to the high-pressure piston (11). The process boosting cylinder (23) is provided with a process boosting piston (21), and a process boosting rod (22) is connected to the process boosting piston (21). Its free end extends into the high-pressure process chamber (10) through the middle cover (15). The process oil storage device (30) is connected to the high-pressure process chamber (10) in a pipeline. The return booster cylinder (54) is equipped with a return booster piston (51), and a return booster rod (52) is connected to the return booster piston (51). Its free end extends into the return high pressure cylinder (41) through the return booster front cover (53). The high pressure return chamber (1A) pipeline is connected to the return high pressure cylinder (41). The process booster cylinder (23) and the return booster cylinder (54) are connected to a high-pressure air source; It also includes a control system, which controls the on / off of the high-pressure air source to achieve different actions of the booster cylinder.

2. The dual-pressure type gas-liquid booster cylinder according to claim 1, characterized in that, The process boosting cylinder (23) is provided with a process boosting piston (21), which forms a boosting process chamber (20) and a boosting return chamber (2A).

3. The dual-pressure type gas-liquid booster cylinder according to claim 1, characterized in that, The return boost cylinder (54) is provided with a return boost piston (51), in which a return boost chamber (50) and a return reset chamber (5A) are formed.

4. The dual-pressure type gas-liquid booster cylinder according to claim 1, characterized in that, The lower part of the inner cavity of the return oil storage device (60) is filled with hydraulic oil, and the upper part of the hydraulic oil in the inner cavity of the return oil storage device (60) is provided with a first air cavity (61); the lower part of the inner cavity of the process oil storage device (30) is filled with hydraulic oil, and the upper part of the hydraulic oil in the inner cavity of the process oil storage device (30) is provided with a second air cavity (31). The first air chamber (61) is provided with an air port A, the second air chamber (31) is provided with an air port B, the boosting return chamber (2A) is provided with an air port C, the boosting process chamber (20) is provided with an air port D, the return reset chamber (5A) is provided with an air port E, and the return boosting chamber (50) is provided with an air port F.

5. The dual-pressure type gas-liquid booster cylinder according to claim 1, characterized in that, A high-pressure front cover (13) is provided on one end of the high-pressure cylinder barrel (14) opposite to the middle cover (15).

6. The dual-pressure type gas-liquid booster cylinder according to claim 1, characterized in that, The process boosting cylinder barrel (23) is provided with a process boosting rear cover (24) at one end opposite to the middle cover (15).

7. The dual-pressure type gas-liquid booster cylinder according to claim 1, characterized in that, The return booster cylinder (54) has a return booster rear cover (55) at one end opposite to the return booster front cover (53).

8. The dual-pressure type gas-liquid booster cylinder according to claim 4, characterized in that, The A and B ports are respectively connected to the pre-pressure control valve (71) via pipelines, the C and D ports are respectively connected to the process boost control valve (72) via pipelines, and the E and F ports are respectively connected to the return boost control valve (73) via pipelines.

9. A control method for a dual-boost type gas-liquid booster cylinder, characterized in that, The application of the dual-pressure type gas-liquid booster cylinder according to claim 4 includes the following steps: Step 1, Pre-pressurization and forward movement: The air source vents into the second air chamber (31) through the B air port, while the A air port exhausts the air. The hydraulic oil in the driving process oil storage device (30) enters the high-pressure process chamber (10). The high-pressure piston (11) drives the output piston rod (12) to pre-pressurize and move forward. Correspondingly, the output piston rod (12) drives the upper mold to move down quickly and stick to the workpiece. Step 2, pressurization and forward movement: After the upper mold touches the workpiece, air is introduced through port D and air is exhausted through port C. The process pressurization piston (21) drives the process pressurization rod (22) forward. The process pressurization rod (22) pressurizes the hydraulic oil in the high-pressure process chamber (10), thereby realizing the pressurization and forward movement of the high-pressure piston (11). Correspondingly, the output piston rod (12) drives the upper mold to pressurize and move downward and close with the lower mold. Step 3, venting and depressurizing: After the mold is closed, the C air port is vented and the D air port is vented. The process booster piston (21) drives the process booster rod (22) to return, so that the booster return chamber (2A) is vented and the booster process chamber (20) is vented and depressurized. Step 4, pressurized return: The air source vents into the first air chamber (61) through air port A, while air port B vents, driving the hydraulic oil in the return oil storage device (60) into the high-pressure return chamber (1A). The high-pressure piston (11) drives the output piston rod (12) to return. If the return force of the high-pressure piston (11) is insufficient to pull the upper mold off the lower mold, air port F vents, while air port E vents. The return booster piston (51) drives the return booster rod (52) forward. The return booster rod (52) boosts the hydraulic oil in the return high-pressure cylinder (41). The high-pressure hydraulic oil enters the high-pressure return chamber (1A) to realize the pressurized return of the high-pressure piston (11). Correspondingly, the output piston rod (12) drives the upper mold to separate from the lower mold. Step 5, return reset: Air is introduced through port E, and air is discharged through port F at the same time. The return booster piston (51) drives the return booster rod (52) to return reset.

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