Compound type supercharging cylinder

Abstract

The application discloses a composite type pressure boosting cylinder, which comprises a main piston cylinder, a driving motor and an auxiliary piston cylinder. The main piston cylinder comprises a main cylinder body and a main piston rod, and the driving motor drives the main piston rod to slide on the main cylinder body. The auxiliary piston cylinder comprises an auxiliary cylinder body and an auxiliary piston rod. The auxiliary cylinder body is provided with a working cavity, a liquid storage cavity, a first liquid flow channel, a pressure boosting channel and a second liquid flow channel. The auxiliary piston rod is slidably arranged in the working cavity and has at least an initial position and a terminal position. When the auxiliary piston rod is in the initial position, the auxiliary piston rod extends into the pressure boosting channel and is in sealing cooperation with the channel side wall of the pressure boosting channel. The auxiliary cylinder body is further provided with a first control channel in communication with the working cavity and used for controlling the auxiliary piston rod to continuously slide into the pressure boosting channel in a direction to the terminal position, and a second control channel used for controlling the auxiliary piston rod in the terminal position to slide to the initial position. The pressure boosting cylinder can reliably boost pressure and save energy.

Description

Technical Field

[0001] This invention relates to a mold-closing power source for use in mold-closing applications, and more particularly to a composite booster cylinder for use in mold-closing applications. Background Technology

[0002] As is well known, pulp forming machines involve processes such as wet blank forming, hot pressing and shaping of wet blanks to form dry blanks, and trimming of dry blanks to form initial products.

[0003] In the process of wet blank forming and wet blank hot pressing, the piston cylinder responsible for opening and closing is indispensable; in order to ensure the reliability of mold closing and pressing, a gas-liquid booster cylinder is generally used as the power source for mold opening and closing, providing pressure and pressure holding for the formed workpiece.

[0004] However, existing pneumatic-hydraulic booster cylinders include a piston cylinder, a pneumatic cylinder for driving the piston rod in the piston cylinder to perform mold opening and closing movements, and a booster cylinder for pressurizing the piston rod in the mold closing state. Since the opening and closing movements of the piston rod are driven by the pneumatic cylinder, gas is used back and forth, resulting in a large waste of gas. At the same time, the booster cylinder also has the defect of poor reliability in pressurizing the piston rod.

[0005] Of course, the gas-hydraulic booster cylinders used as power sources in other fields also have the above-mentioned defects.

[0006] Therefore, it is necessary to provide a composite booster cylinder that is reliable and energy-saving to overcome the above-mentioned defects. Summary of the Invention

[0007] The purpose of this invention is to provide a composite booster cylinder that provides reliable and energy-saving boosting.

[0008] To achieve the above objectives, the composite booster cylinder of the present invention includes a main piston cylinder, a drive motor, and an auxiliary piston cylinder for assisting in boosting the main piston cylinder. The main piston cylinder includes a main cylinder body and a main piston rod slidably disposed within the inner cavity of the main cylinder body. The main piston rod is sealed to the side wall of the inner cavity. A first end of the main piston rod extends through the end wall of the inner cavity along the sliding direction of the main piston rod and is sealed to the end wall. A second end of the main piston rod extends through the end wall of the inner cavity along the sliding direction of the main piston rod. The side wall or end wall has a liquid inlet / outlet channel communicating with the inner cavity. The drive motor is located outside the main cylinder body and is directly or indirectly assembled and connected to the first end of the main piston rod. The drive motor drives the main piston rod to slide on the main cylinder body. The auxiliary piston cylinder includes an auxiliary cylinder body and an auxiliary piston rod. The auxiliary cylinder body has a working chamber, a liquid storage chamber separated from the working chamber, a first liquid flow channel communicating with the liquid storage chamber, a pressurization channel communicating with the first liquid flow channel, and a second liquid flow channel communicating with the pressurization channel. The second liquid flow channel communicates with the liquid inlet / outlet channel. The auxiliary piston rod is slidable... The auxiliary piston rod is slidably placed in the working chamber and has at least an initial position and a termination position relative to the auxiliary cylinder. In the initial position, the auxiliary piston rod extends into the pressurization channel and is sealed to the side wall of the pressurization channel. The auxiliary cylinder also has a first control channel communicating with the working chamber for controlling the auxiliary piston rod to continue sliding along the direction of extending into the pressurization channel to the termination position, and a second control channel communicating with the working chamber for controlling the auxiliary piston rod in the termination position to slide back to the initial position. When the auxiliary piston rod is in the initial position, the liquid in the storage chamber can flow into the inner cavity along the first liquid flow channel, the pressurization channel, the second liquid flow channel, and the liquid inlet / outlet channel. During the process of switching the auxiliary piston rod from the initial position to the termination position, the communication between the pressurization channel and the first liquid flow channel is cut off. Then, under the pressure of the auxiliary piston rod, the liquid in the pressurization channel is forced into the inner cavity from the second liquid flow channel and the liquid inlet / outlet channel.

[0009] Preferably, a first sealing ring and a second sealing ring are embedded on the side wall of the pressurization channel, spaced apart along the sliding direction of the auxiliary piston rod. The connection between the first liquid flow channel and the pressurization channel is located between the first sealing ring and the second sealing ring. The auxiliary piston rod is fitted with the first sealing ring in the initial position and is also fitted with the second sealing ring when the auxiliary piston rod is switched from the first initial position to the final position. The second sealing ring is also located between the connection between the second liquid flow channel and the pressurization channel and the first sealing ring along the sliding direction of the auxiliary piston rod.

[0010] Preferably, the auxiliary cylinder includes an intermediate end seal, a first cylinder with its open end sealed to a first side of the intermediate end seal, a second cylinder with its open end sealed to a second side opposite to the intermediate end seal, and a tube located in the second cylinder with its open end sealed to the second side of the intermediate end seal. The first cylinder and the first side of the intermediate end seal together enclose the working chamber, and the second side of the intermediate end seal and the second cylinder together enclose the liquid storage chamber. The pressurization channel is formed in both the intermediate end seal and the tube, and the pressurization channel also penetrates the intermediate end seal. The first liquid flow channel and the second liquid flow channel are each formed at the intermediate end seal.

[0011] Preferably, the auxiliary cylinder further includes a support rod located in the second cylinder, one end of the support rod being assembled and connected to the end of the tube away from the intermediate end seal, and the other end of the support rod extending out of the second cylinder and being fixedly connected to the second cylinder.

[0012] Preferably, the first liquid flow channel is located above the pressurization channel, the pressurization channel is located above the second liquid flow channel, and the second liquid flow channel is located above the liquid inlet / outlet channel.

[0013] Preferably, the auxiliary cylinders are arranged side-by-side above the main cylinder.

[0014] Preferably, the working chamber is arranged separately from the liquid storage chamber along the sliding direction of the auxiliary piston rod.

[0015] Preferably, a lead screw is fixed to the first end of the main piston rod, the lead screw is slidably fitted onto a lead screw that extends along the sliding direction of the main piston rod, the lead screw is located outside the main cylinder body, and the drive motor drives the lead screw to rotate.

[0016] Preferably, the drive motor drives the lead screw to rotate via belt drive, chain drive, or gear drive.

[0017] Preferably, the drive motor and the lead screw are arranged side by side, the output shaft of the drive motor is parallel to the lead screw, and the output shaft of the drive motor is arranged with its back to the main cylinder.

[0018] Compared to existing technologies, since the main piston rod is driven by a motor to slide on the main cylinder, its back-and-forth sliding is faster and more stable, thus achieving energy savings. More importantly, when the auxiliary piston rod is in its initial position, the liquid in the reservoir can flow into the inner cavity along the first liquid flow channel, the pressurization channel, the second liquid flow channel, and the liquid inlet / outlet channel. During the transition from the initial to the final position, the auxiliary piston rod cuts off the connection between the pressurization channel and the first liquid flow channel, preventing backflow of liquid from the pressurization channel into the reservoir. Furthermore, while preventing backflow, the liquid in the pressurization channel is also forced into the inner cavity through the second liquid flow channel and the liquid inlet / outlet channel by the pressure of the auxiliary piston rod, achieving reliable and stable pressurization of the main piston rod. Attached Figure Description

[0019] Figure 1 This is a plan view of the composite booster cylinder of the present invention when both the main piston rod and the auxiliary piston rod are in their initial positions.

[0020] Figure 2 yes Figure 1 The diagram shows a plan view of the compound booster cylinder as indicated by arrow A.

[0021] Figure 3 yes Figure 2 The diagram shows the internal structure of the composite booster cylinder when only the main piston cylinder and the auxiliary piston cylinder are sectioned along line BB, and the main piston rod is driven to the contact position by the drive motor.

[0022] Figure 4 yes Figure 3 An enlarged view of part C in the image.

[0023] Figure 5 yes Figure 3 The diagram shows the state of the compound booster cylinder when the auxiliary piston rod switches to the end position.

[0024] Figure 6 yes Figure 3 The diagram shows the state of the composite booster cylinder when it applies pressure to the workpiece.

[0025] Figure 7 yes Figure 5 The diagram shows the state of the compound booster cylinder when it is pressurizing the workpiece.

[0026] Figure 8 yes Figure 7 The diagram shows the state of the compound booster cylinder as the auxiliary piston rod slides to its initial position.

[0027] Figure 9 yes Figure 8The diagram shows the state of the compound booster cylinder when the drive motor moves the main piston rod to the starting position.

[0028] Figure 10 This is an assembly diagram of the first end of the main piston rod, the lead screw nut, and the lead screw in the composite booster cylinder of the present invention. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] Please see Figure 6 The composite booster cylinder 100 of the present invention is used to apply pressure to the workpiece 200 to meet the forming requirements of the workpiece 200.

[0031] and combined Figures 1 to 5 The composite booster cylinder 100 of the present invention includes a main piston cylinder 10, a drive motor 20, and an auxiliary piston cylinder 30 for assisting in boosting the main piston cylinder 10. The main piston cylinder 10 includes a main cylinder body 11 and a main piston rod 12 slidably disposed in the inner cavity 11a of the main cylinder body 11. The main piston rod 12 is sealed to the side cavity wall 111 of the inner cavity 11a to prevent liquid 40 flowing into the inner cavity 11a through the liquid inlet / outlet channel 113 (described below) from leaking from the fit between the main piston rod 12 and the side cavity wall 111. This ensures that the liquid 40 flowing into the inner cavity 11a through the liquid inlet / outlet channel 113 can exert force on the main piston rod 12 to boost pressure. (See attached diagram). Figure 7 As shown; the first end 121 of the main piston rod 12 passes through the end cavity wall 112 of the inner cavity 11a along the sliding direction of the main piston rod 12 (see the direction indicated by arrow A and the opposite direction) and is sealed with the end cavity wall 112 to prevent the liquid 40 flowing into the inner cavity 11a from the liquid inlet / outlet channel 113 from leaking out from the joint between the first end 121 of the main piston rod 12 and the end cavity wall 112. The opposite second end 122 of the main piston rod 12 passes through the end cavity wall 112 of the inner cavity 11a along the sliding direction of the main piston rod 12. Since the first end 121 and the second end 122 of the main piston rod 12 are arranged opposite to each other, the exit direction of the first end 121 is exactly opposite to the exit direction of the second end 122. The end cavity wall 112 is provided with a liquid inlet / outlet channel 113 communicating with the inner cavity 11a, so as to ensure that the direction of the force exerted by the liquid 40 flowing into the inner cavity 11a through the liquid inlet / outlet channel 113 on the main piston rod 12 is the same as the outlet direction of the second end 122. Preferably, the liquid inlet / outlet channel 113 is opened by the end cavity wall 112 through which the first end 121 passes, rather than by the end cavity wall 112 through which the second end 122 passes. Of course, depending on actual needs, the liquid inlet / outlet channel 113 can also be opened by the side cavity wall 111, as long as the direction of the force exerted by the liquid inlet / outlet channel 113 opened by the side cavity wall 111 on the main piston rod 12 is the same as the outlet direction of the second end 122. Therefore, it is not limited to the above description.

[0032] Combined Figures 1 to 5 The drive motor 20 is located outside the main cylinder 11 and is indirectly assembled and connected to the first end 121 of the main piston rod 12. Of course, depending on actual needs, the drive motor 20 can also be directly assembled and connected to the main piston rod 12. When the drive motor 20 is directly assembled and connected to the main piston rod 12, a linear motor can be used. At the same time, the drive motor 20 drives the main piston rod 12 to slide on the main cylinder 11, so as to realize the movement of the main piston rod 12. Figure 9 The starting position shown and Figure 6 The auxiliary piston cylinder 30 switches between the shown contact positions. The auxiliary piston cylinder 30 includes an auxiliary cylinder body 31 and an auxiliary piston rod 32. The auxiliary cylinder body 31 has a working chamber 311, a liquid storage chamber 312 separated from the working chamber 311, a first liquid flow channel 313 communicating with the liquid storage chamber 312, a pressurization channel 314 communicating with the first liquid flow channel 313, a second liquid flow channel 315 communicating with the pressurization channel 314, a first control channel 316 communicating with the working chamber 311, and a second control channel 317 communicating with the working chamber 311. The second liquid flow channel 315 communicates with a liquid inlet / outlet channel 113. The auxiliary piston rod 32 is slidably positioned in the working chamber 311 and has at least the following relative to the auxiliary cylinder body 31: Figure 6 The initial position shown and as follows Figure 7 In the termination position shown, the auxiliary piston rod 32 extends into the pressurization channel 314 in the initial position and is sealed to the channel sidewall 3141 of the pressurization channel 314, as shown in the diagram. Figure 4 As shown, this design aims to prevent the liquid 40 in the pressurization channel 314 from flowing into the working chamber 311; the first control channel 316 is used to control the auxiliary piston rod 32 to continue sliding along the direction extending into the pressurization channel 314 to the termination position, and the second control channel 317 is used to control the auxiliary piston rod 32 in the termination position to slide back to the initial position; therefore, during the process of the auxiliary piston rod 32 switching from the initial position to the termination position, the connection between the pressurization channel 314 and the first liquid flow channel 313 is cut off, as shown in the diagram. Figure 5 and Figure 7 As shown, during the pressurization process, the liquid 40 in the pressurization channel 314 is prevented from flowing back into the first liquid flow channel 313. Under the pressure of the auxiliary piston rod 32, the liquid 40 in the pressurization channel 314 is forced from the second liquid flow channel 315 and the liquid inlet / outlet channel 113 into the inner cavity 11a. The liquid 40 pressed into the inner cavity 11a pressurizes the main piston rod 12, thereby achieving the purpose of applying force and pressurizing the workpiece 200. (See diagram). Figure 7 As shown. More specifically, as follows:

[0033] like Figure 4 and Figure 5As shown, to improve the reliability of the sealing fit between the channel sidewall 3141 of the pressurization channel 314 and the auxiliary piston rod 32, a first sealing ring 33 and a second sealing ring 34 are embedded on the channel sidewall 3141 of the pressurization channel 314, separated along the sliding direction of the auxiliary piston rod 32 (see the direction indicated by arrow A and the opposite direction). The connection point 313a between the first liquid flow channel 313 and the pressurization channel 314 is located between the first sealing ring 33 and the second sealing ring 34. When the auxiliary piston rod 32 is in the initial position, it is fitted with the first sealing ring 33. The auxiliary piston rod 32 is formed by the first sealing ring 33. When the auxiliary piston rod 32 switches from the initial position to the final position, it is still fitted with the second sealing ring 34. The second sealing ring 34 is located between the connection point 314a of the second liquid flow channel 315 and the pressurization channel 314 and the first sealing ring 33 along the sliding direction of the auxiliary piston rod 32. With the introduction of the first sealing ring 33 and the second sealing ring 34, it is effectively ensured that the connection between the pressurization channel 314 and the first liquid flow channel 314 is reliably cut off during the process of the auxiliary piston rod 32 switching to the final position, without affecting the state of maintaining the connection between the second liquid flow channel 315 and the pressurization channel 314. In addition, the working chamber 311 is arranged separately from the liquid storage chamber 312 along the sliding direction of the auxiliary piston rod 32, so that their arrangement is more compact. Of course, according to actual needs, the working chamber 311 can also be arranged side by side with the liquid storage chamber 312 in a direction perpendicular to the sliding direction of the auxiliary piston rod 32, and the working chamber 311 arranged side by side is also staggered with the liquid storage chamber 312 along the sliding direction of the auxiliary piston rod 32, but such an arrangement will cause the defect of large space occupation.

[0034] like Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the auxiliary cylinder 31 includes an intermediate end seal 31a, a first cylinder 31b with its open end sealed to the first side of the intermediate end seal 31a, a second cylinder 31c with its open end sealed to the second side of the intermediate end seal 31a, and a tube 31d located in the second cylinder 31c with its open end sealed to the second side of the intermediate end seal 31a. The first cylinder 31b and the first side of the intermediate end seal 31a together enclose a working chamber 311, and the second side of the intermediate end seal 31a and the second cylinder 31c together enclose a liquid storage chamber 31. 2. A pressurization channel 314 is formed on both the intermediate end seal 31a and the pipe body 31d, and the pressurization channel 314 also penetrates the intermediate end seal 31a. The first liquid flow channel 313 and the second liquid flow channel 315 are each formed at the intermediate end seal 31a. This design makes the manufacturing and processing of the first liquid flow channel 313, the second liquid flow channel 315, and the pressurization channel 314 at the intermediate end seal 31a easier, and allows the first cylinder body 31b and the second cylinder body 31c to share the intermediate end seal 31a, reducing the number of intermediate end seals 31a used. Specifically, in Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 In the auxiliary cylinder 31, a support rod 31e is also included in the second cylinder 31c. One end of the support rod 31e is connected to the end of the tube 31d away from the intermediate end seal 31a, and the other end of the support rod 31e extends out of the second cylinder 31c and is fixedly connected to the second cylinder 31c. This is to increase the stability of the tube 31d and prevent the suspended tube 31d from shaking when the auxiliary piston rod 32 squeezes the liquid 40 in the pressurization channel 314. More specifically, to make the liquid 40 in the storage chamber 312 tend to flow towards the inner cavity 11a under its own weight, the first liquid flow channel 313 is located above the pressurization channel 314, the pressurization channel 314 is located above the second liquid flow channel 315, and the second liquid flow channel 315 is located above the liquid inlet / outlet channel 113. To make the structure between the main piston cylinder 10 and the auxiliary piston cylinder 30 more compact, in... Figures 5 to 9 In this configuration, the auxiliary cylinders 31 are arranged side-by-side above the main cylinder 11. Alternatively, depending on the specific requirements, the auxiliary cylinders 31 can be arranged in a cross-shaped configuration with the main cylinder 11. It should be noted that the power driving the auxiliary piston rod 32 can be gas or liquid, and correspondingly, gas or liquid is introduced through the first control channel 316 and the second control channel 317. To make the arrangement of the first control channel 316 and the second control channel 317 more rational, the first control channel 316 is opened at the end of the first cylinder 31b away from the intermediate end seal 31a, and the second control channel 317 is opened at the intermediate end seal 31a.

[0035] like Figure 9 and Figure 10 As shown, since the drive motor 20 is indirectly assembled with the first end 121 of the main piston rod 12, a preferred method for achieving indirect assembly is as follows: a lead screw 50 is fixed to the first end 121 of the main piston rod 12. The lead screw 50 is slidably fitted onto a lead screw 60 extending along the sliding direction of the main piston rod 12. The lead screw 60 is located outside the main cylinder 11, and the drive motor 20 drives the lead screw 60 to rotate, thereby ensuring the accuracy and reliability of the sliding of the main piston rod 12. Specifically, in Figures 5 to 9 In this configuration, the drive motor 20 drives the lead screw 60 to rotate via the belt drive 22. Of course, depending on actual needs, the lead screw 60 can also be driven to rotate via chain drive or gear drive, so it is not limited to this. In addition, the drive motor 20 and the lead screw 60 are arranged side by side, and the output shaft 21 of the drive motor 20 is parallel to the lead screw 60. The output shaft 21 of the drive motor 20 is arranged with its back to the main cylinder 11. This design makes the structure between the drive motor 20 and the lead screw 60 more compact.

[0036] Combination Figures 6 to 9 The working principle of the composite booster cylinder 100 of the present invention is explained as follows: First, the drive motor 20 drives the lead screw 60 to rotate via the belt drive 22. The rotating lead screw 60 drives the lead screw nut 50 and the main piston rod 11 to slide together in the direction indicated by arrow A to the contact position, so that the main piston rod 11 in the contact position abuts against the workpiece 200. Since the auxiliary piston rod 32 is in the initial position, the liquid 40 in the liquid storage chamber 312 can flow into the inner cavity 11a along the first liquid flow channel 313, the booster channel 314, the second liquid flow channel 315 and the liquid inlet and outlet channel 113, as shown in the figure. Figure 6 As shown; next, gas is introduced into the first control channel 316, and the gas pushes the auxiliary piston rod 32 from the initial position to the termination position; during the process of the auxiliary piston rod 32 switching to the termination position, the auxiliary piston rod 32 cuts off the connection between the first liquid flow channel 313 and the pressurization channel 314, and squeezes the liquid 40 in the pressurization channel 314, so that the liquid 40 in the pressurization channel 314 continues to be forced into the inner cavity 11a along the second liquid flow channel 314 and the liquid inlet and outlet channel 315, thereby achieving the purpose of pressurizing the main piston rod 12, thus achieving the force increase on the workpiece 200, as shown in the state. Figure 7 As shown; after the workpiece 200 completes the pressure increase, gas is introduced through the second control channel 317, which pushes the auxiliary piston rod 32 from the termination position to the initial position. During the switching to the initial position, the auxiliary piston rod 32 disengages from the cutoff between the first liquid flow channel 313 and the pressure boosting channel 314, realizing the connection between the first liquid flow channel 313 and the pressure boosting channel 314. (See diagram). Figure 8 As shown; finally, the drive motor 20 drives the lead screw 60 to reverse direction via the belt drive 22. The reversed lead screw 60 drives the lead screw nut 50 and the main piston rod 12 to slide together in the direction indicated by arrow A to the starting position. During the process of the main piston rod 12 sliding to the starting position, it pushes the liquid 40 in the inner cavity 11a to flow back to the liquid storage cavity 312, as shown in the figure. Figure 9 As shown; therefore, after the above process, one cycle of the composite booster cylinder 100 of the present invention applying force to boost the pressure of the workpiece 200 is completed. It should be noted that when gas is connected to the first control channel 316, gas does not need to be connected to the second control channel 317. Similarly, when gas is connected to the second control channel 317, gas does not need to be connected to the first control channel 316.

[0037] Compared with existing technologies, since the main piston rod 12 is driven by the drive motor 20 to slide on the main cylinder 11, the back-and-forth sliding of the main piston rod 12 is faster and more stable, thereby achieving energy saving. More importantly, when the auxiliary piston rod 32 is in the initial position, the liquid 40 in the storage chamber 312 can flow into the inner cavity 11a along the first liquid flow channel 313, the pressurization channel 314, the second liquid flow channel 315, and the liquid inlet / outlet channel 113. During the process of switching from the initial position to the termination position, the auxiliary piston rod 32 cuts off the connection between the pressurization channel 314 and the first liquid flow channel 313, preventing the liquid 40 in the pressurization channel 314 from flowing back from the first liquid flow channel 314 to the storage chamber 312; and while preventing the liquid 40 from flowing back, it also allows the liquid 40 in the pressurization channel 314 to be squeezed into the inner cavity 11a from the second liquid flow channel 315 and the liquid inlet / outlet channel 113 under the pressure of the auxiliary piston rod 32, realizing reliable and stable pressurization of the main piston rod 12, as shown in the figure. Figure 7 As shown.

[0038] The above-disclosed examples are merely preferred embodiments of the present invention, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A composite booster cylinder, characterized in that, The system includes a main piston cylinder, a drive motor, and an auxiliary piston cylinder for pressurizing the main piston cylinder. The main piston cylinder includes a main cylinder body and a main piston rod slidably disposed within the inner cavity of the main cylinder body. The main piston rod is sealed to the side wall of the inner cavity. A first end of the main piston rod extends through the end wall of the inner cavity along the sliding direction of the main piston rod and is sealed to the end wall. A second end of the main piston rod, opposite to the main piston rod, extends through the end wall of the inner cavity along the sliding direction of the main piston rod. The side wall or end wall has an opening that connects to the inner cavity. A connected liquid inlet and outlet channel is provided. The drive motor is located outside the main cylinder body and is directly or indirectly assembled and connected to the first end of the main piston rod. The drive motor drives the main piston rod to slide on the main cylinder body. The auxiliary piston cylinder includes an auxiliary cylinder body and an auxiliary piston rod. The auxiliary cylinder body has a working chamber, a liquid storage chamber separated from the working chamber, a first liquid flow channel communicating with the liquid storage chamber, a pressurization channel communicating with the first liquid flow channel, and a second liquid flow channel communicating with the pressurization channel. The second liquid flow channel is connected to the liquid... The auxiliary piston rod is slidably positioned in the working chamber and has at least an initial position and a termination position relative to the auxiliary cylinder body. In the initial position, the auxiliary piston rod extends into the pressurization channel and seals against the channel sidewall. The auxiliary cylinder body also has a first control channel communicating with the working chamber for controlling the auxiliary piston rod to continue sliding along the direction of extension into the pressurization channel to the termination position, and a second control channel communicating with the working chamber for controlling the auxiliary piston rod in the termination position to slide towards the initial position. When the auxiliary piston rod is in the initial position, the liquid in the storage chamber flows into the inner cavity along the first liquid flow channel, the pressurization channel, the second liquid flow channel, and the liquid inlet / outlet channel. During the transition from the initial position to the termination position, the auxiliary piston rod cuts off the connection between the pressurization channel and the first liquid flow channel. Then, under the pressure of the auxiliary piston rod, the liquid in the pressurization channel is forced into the inner cavity from the second liquid flow channel and the liquid inlet / outlet channel. The auxiliary cylinder includes an intermediate end seal, a first cylinder with its open end sealed to a first side of the intermediate end seal, a second cylinder with its open end sealed to a second side opposite to the intermediate end seal, a support rod located in the second cylinder, and a tube located in the second cylinder with its open end sealed to a second side of the intermediate end seal. The first cylinder and the first side of the intermediate end seal together enclose the working chamber, and the second side of the intermediate end seal and the second cylinder together enclose the liquid storage chamber. The pressurization channel is formed in both the intermediate end seal and the tube, and the pressurization channel also penetrates the intermediate end seal. The first liquid flow channel and the second liquid flow channel are each formed in the intermediate end seal. One end of the support rod is connected to the end of the tube away from the intermediate end seal, and the other end of the support rod passes through the second cylinder and is fixedly connected to the second cylinder. The working chamber is arranged separately from the liquid storage chamber along the sliding direction of the auxiliary piston rod.

2. The composite booster cylinder according to claim 1, characterized in that, The sidewall of the pressurization channel is fitted with a first sealing ring and a second sealing ring that are separated by the sliding direction of the auxiliary piston rod. The connection between the first liquid flow channel and the pressurization channel is located between the first sealing ring and the second sealing ring. The auxiliary piston rod is fitted with the first sealing ring when it is in the initial position. When the auxiliary piston rod is switched from the initial position to the termination position, it is also fitted with the second sealing ring. The second sealing ring is also located between the connection between the second liquid flow channel and the pressurization channel and the first sealing ring along the sliding direction of the auxiliary piston rod.

3. The composite booster cylinder according to claim 1, characterized in that, The first liquid flow channel is located above the pressurization channel, the pressurization channel is located above the second liquid flow channel, and the second liquid flow channel is located above the liquid inlet / outlet channel.

4. The composite booster cylinder according to claim 3, characterized in that, The auxiliary cylinders are arranged side-by-side above the main cylinder.

5. The composite booster cylinder according to claim 1, characterized in that, A lead screw is fixed to the first end of the main piston rod. The lead screw is slidably fitted onto a lead screw that extends along the sliding direction of the main piston rod. The lead screw is located outside the main cylinder body. The drive motor drives the lead screw to rotate.

6. The composite booster cylinder according to claim 5, characterized in that, The drive motor drives the lead screw to rotate via belt drive, chain drive, or gear drive.

7. The composite booster cylinder according to claim 5, characterized in that, The drive motor is arranged side by side with the lead screw, and the output shaft of the drive motor is parallel to the lead screw, with the output shaft of the drive motor facing away from the main cylinder.

Images