A composite device of a membrane electrode assembly for pressure equalization

Abstract

This invention relates to a pressure-equalizing membrane electrode assembly composite device, comprising a base plate assembly and an upper pressure assembly. The upper pressure assembly is designed above the base plate assembly and includes an upper pressure plate, an air chamber plate, and an air chamber pad. The upper pressure plate has a rectangular through hole in the middle and is installed below the air chamber plate. The air chamber pad is installed between the upper pressure plate and the air chamber plate, covering the rectangular through hole. The upper pressure plate and the air chamber pad form an air chamber chamber. A circular groove is designed at the lower middle end of the air chamber plate, and a channel is designed on one side of the bottom of the groove, which connects to one side of the air chamber plate. The base plate assembly includes a clearance plate and a bottom heating plate. A hot-pressing movable plate is detachably installed on the clearance plate. The multilayer membrane electrode is stacked on the hot-pressing movable plate. The advantage is that by designing the air chamber pad, the inside of the air chamber pad is inflated to make the air chamber pad full of equal air pressure. The air chamber pad is also an elastic element, and the extrusion surface after inflation can be changed according to the membrane electrode, resulting in a uniformly molded composite membrane electrode.

Description

Technical Field

[0001] This invention relates to the field of membrane electrode processing, and more specifically to a composite equipment for equalizing membrane electrode assemblies. Background Technology

[0002] The membrane electrode assembly (MEA) is a key component for fuel cell power generation. The MEA and the bipolar plates on both sides form the basic unit of a fuel cell – a fuel cell single cell, which consists of plates, a gas diffusion layer, a catalyst layer, and a proton exchange membrane.

[0003] In the past, the production process of membrane electrode composites involved stacking multiple membranes together, pressing them together with upper and lower molds, and heating them. However, this heating and pressing method can lead to uneven stress on the product and substandard product quality. Since the sizes of the multiple membranes are not always the same, it is even more difficult to apply uniform stress during molding. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a composite device for equalizing pressure film electrode assembly, which features an ingenious design and compact structure, enabling uniform molding of film electrodes and improving product quality.

[0005] The technical solution of the present invention:

[0006] A pressure-equalizing membrane electrode assembly composite device includes a base plate assembly and an upper pressure assembly. The upper pressure assembly is designed above the base plate assembly. The upper pressure assembly includes an upper pressure plate, an air chamber plate, and an air chamber pad. The upper pressure plate has a rectangular through hole in the middle. The upper pressure plate is installed below the air chamber plate, and the air chamber pad is installed between the upper pressure plate and the air chamber plate. The air chamber pad covers the rectangular through hole, and the upper pressure plate and the air chamber pad form an air chamber chamber. The lower middle of the air chamber plate has a circular groove, and a channel is designed on one side of the bottom of the circular groove, which connects to one side of the air chamber plate. The base plate assembly includes a clearance plate and a bottom heating plate. The clearance plate is installed on the middle of the bottom heating plate, and an annular step is formed between the clearance plate and the bottom heating plate. The upper pressure assembly is pressed onto the base plate assembly, with the upper pressure plate pressing on the annular step. The clearance plate extends into the rectangular through hole. A hot-pressing movable plate is detachably installed on the clearance plate, and multiple layers of membrane electrodes are stacked on the hot-pressing movable plate.

[0007] The upper pressure plate has several positioning holes around its lower end, and the lower heating plate has several positioning pins around its upper end. The positioning pins are located on the annular step. When pressed, the positioning pins are inserted into the corresponding positioning holes.

[0008] The positioning hole is designed as a cylindrical hole, and the positioning pin is designed as a tapered pin that is narrower at the top and wider at the bottom, matching the positioning hole.

[0009] The base plate assembly further includes a lower heating assembly, which includes a lower heating plate and heating rods. The lower heating plate is fixed below the base heating plate and has several transverse through holes, in which heating rods are installed respectively. The upper pressure assembly further includes an upper heating assembly, which includes an upper heating plate and heating rods. The upper heating plate is fixed above the air chamber plate and has several transverse through holes, in which heating rods are installed respectively.

[0010] The air chamber cushion is a silicone pad.

[0011] The rectangular through hole is designed as a four-sided pyramidal hole that is narrow at the top and widens at the bottom.

[0012] The hot-pressing moving plate includes a double-press moving plate, a spring positioning part, a positioning cloth, and a protective cloth. Two spring grooves are respectively opened near both ends of the double-press moving plate, with a through hole in the center of the bottom of each spring groove. The spring positioning part includes a spring, an upper positioning cap, and a lower positioning bolt. The spring is located inside the spring groove. A threaded hole is opened in the center of the lower end of the upper positioning cap. The lower positioning bolt passes upward through the through hole at the lower end of the double-press moving plate, and the spring is sleeved on the outside of the screw of the lower positioning bolt. The upper end of the lower positioning bolt is screwed into the upper positioning cap, and the lower end of the upper positioning cap presses against the spring. The multilayer film includes two long films and three short films. Two long membranes are inserted between three short membranes and stacked sequentially on the pressure moving plate. Two round holes are designed on each side of the long membrane. The long membrane is fitted onto the outside of the upper positioning cap through the round holes on both sides. The two ends of the short membranes abut against the inside of the upper positioning caps on both sides. The positioning cloth covers the top of the multilayer membrane. A rectangular hole is opened in the middle of the positioning cloth. The uppermost short membrane is embedded in the rectangular hole. The bottom of the positioning cloth is pressed on the uppermost long membrane. The protective cloth covers the positioning cloth and the outside of the uppermost short membrane. Two slots are opened on the top of the clearance plate near the two sides for the lower positioning bolts to position.

[0013] The aforementioned pressure-adjusting moving plate has a number of vacuum adsorption holes evenly distributed on it. The aforementioned pressure-equalizing membrane electrode assembly composite equipment also includes a vacuum adsorption plate for adsorbing the multilayer membrane of the membrane electrode by the pressure-adjusting moving plate. The vacuum adsorption plate is designed with an adsorption cavity, and an adsorption channel is laid at the bottom of the adsorption cavity. A vacuum adsorption interface is designed on one side of the vacuum adsorption plate, and the vacuum adsorption interface is connected to the adsorption channel. The vacuum adsorption plate is also designed with a circular groove for positioning by the lower positioning bolt of the spring positioning part.

[0014] The aforementioned pressure equalizing membrane electrode assembly composite equipment also includes a frame, a main cylinder, an upper crossbeam, a slide plate, and a worktable. The worktable is designed on the frame, and the upper crossbeam is mounted on the worktable via four columns. The main cylinder is installed in the middle of the upper crossbeam, and the lower end of the main cylinder is connected to a slide plate. The four corners of the slide plate are slidably fitted onto the four columns. The upper pressure assembly is installed below the slide plate, and the bottom plate assembly is slidably mounted on the worktable. The bottom plate assembly can slide under the upper pressure assembly.

[0015] The process of assembling the pressure equalization film electrode assembly.

[0016] The first step involves placing the hot-pressing moving plate on the vacuum adsorption plate, then stacking the multilayer membrane electrode assembly to be laminated onto the hot-pressing moving plate. The vacuum adsorption plate is activated, and the multilayer membrane is adsorbed through the vacuum adsorption holes on the top of the hot-pressing moving plate. The multilayer membrane is also secured by upper positioning pins on both sides of the hot-pressing moving plate via spring positioning parts. A positioning cloth is installed on top of the multilayer membrane, and a protective cloth is then placed over the positioning cloth. The second step involves stopping the vacuum adsorption plate, removing the hot-pressing moving plate and the membrane electrode assembly to be laminated together, and placing them above the base plate assembly of the equalizing membrane electrode assembly laminating device. The lower positioning bolts of the spring positioning parts are inserted into the slots on the clearance plate for positioning. The multilayer membrane to be laminated then slides down below the upper pressure assembly along with the base plate assembly.

[0017] The third step involves the main cylinder controlling the upper pressure assembly to descend, while the upper pressure plate is precisely positioned by engaging with the positioning pins on the bottom heating plate through several positioning holes. The upper pressure plate of the upper pressure assembly is fitted onto the outside of the multilayer film to be laminated and the air-proof plate through a rectangular through hole. The air chamber cushion is pressed onto the protective cloth above the multilayer film to be laminated.

[0018] The fourth step involves the upper and lower heating components starting to heat, adjusting the temperature according to the existing material requirements (0~180℃). Simultaneously, compressed air is introduced into the channels on one side of the air chamber plate of the upper pressure component. The specific pressure range is set according to actual requirements; the normal operating pressure range is 0~0.8MPa, and a high-pressure pipeline can also be used to introduce high-pressure air. The compressed air enters the circular groove through the channels and then enters the gap between the air chamber pad and the air chamber plate, generating uniform air pressure on the air chamber pad. The air chamber pad then uniformly extrudes and laminates the multilayer mold of the membrane electrode to be laminated below. The pressure holding time is set according to the supply requirements.

[0019] Fifth step: stop heating, release compressed air, the main cylinder drives the upper pressure component to rise and reset, the composite membrane electrode and the base plate component slide out from under the upper pressure component, remove the hot pressing moving plate and the composite membrane electrode, remove the protective cloth and positioning cloth, remove the composite membrane electrode, and complete the hot composite.

[0020] The advantages of this invention are that by designing an air chamber pad, the inside of which is inflated to maintain a uniform air pressure, and the air chamber pad is also an elastic element. After inflation, the extrusion surface can be adjusted according to the membrane electrode, thus enabling uniform molding of the composite membrane electrode. The spring positioning part is ingeniously designed, enabling both vertical positioning and ensuring no interference during subsequent lamination. It assists in the initial positioning of the multilayer membrane and facilitates rapid positioning of the lower end with the vacuum adsorption plate. During the later thermal lamination process, the upper positioning cap is compressed downwards, but still effectively limits the multilayer membrane, preventing movement during thermal lamination. The lower positioning bolt and the anti-aircraft plate provide rapid positioning and stability. Attached Figure Description

[0021] Figure 1 This is an exploded view of the present invention.

[0022] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0023] Figure 3 This is a schematic diagram of the vertical cross-section of the present invention.

[0024] Figure 4 This is a schematic diagram of the vertical cross-section of the positioning pin and positioning hole of the present invention.

[0025] Figure 5 This is a schematic diagram of the middle longitudinal section of the present invention.

[0026] Figure 6 This is a longitudinal sectional view of the spring positioning part of the present invention.

[0027] Figure 7 This is a schematic diagram of the spring positioning part of the present invention.

[0028] Figure 8 This is a schematic diagram of the application of the pressure equalizing film electrode assembly composite equipment of the present invention to a hydraulic press.

[0029] Figure 9 This is a schematic diagram of the multilayer film assembly operation of the membrane electrode of the present invention.

[0030] Figure 10 This is a schematic diagram of the pressure-up component of the present invention. Detailed Implementation

[0031] See attached document Figure 1-10A pressure equalizing membrane electrode assembly composite device includes a base plate assembly 1 and an upper pressure assembly 2. The upper pressure assembly 2 is designed above the base plate assembly 1. The upper pressure assembly 2 includes an upper pressure plate 21, an air chamber plate 22, and an air chamber pad 23. The upper pressure plate 21 has a rectangular through hole 4 in the middle. The upper pressure plate 21 is installed below the air chamber plate 22, and the air chamber pad 23 is installed between the upper pressure plate 21 and the air chamber plate 22. The air chamber pad 23 covers the rectangular through hole 4, and the upper pressure plate 21 and the air chamber pad 23 form an air chamber chamber. The lower middle end of the air chamber plate 22 is designed with a circular groove 24. The bottom of the circular groove 24... A channel 25 is designed on one side of the part, which connects to one side of the air chamber plate 22; the bottom plate assembly 1 includes a clearance plate 11 and a bottom heating plate 12. The clearance plate 11 is installed on the middle of the bottom heating plate 12, and an annular step is formed between the clearance plate 11 and the bottom heating plate 12; the upper pressure assembly 2 is pressed on the bottom plate assembly 1, and the upper pressure plate 21 is pressed on the annular step position. The clearance plate 11 extends into the rectangular through hole 4; the hot pressing moving plate 10 is detachably installed on the clearance plate 11, and the multilayer film 30 of the membrane electrode is stacked on the hot pressing moving plate 10.

[0032] The upper pressure plate 21 has several positioning holes 26 around its lower circumference, and the lower heating plate 12 has several positioning pins 27 correspondingly designed around its upper circumference. These positioning pins 27 are located on the annular step, and during pressing, they are inserted into the corresponding positioning holes 26. The positioning holes 26 are cylindrical, and the positioning pins 27 are tapered pins, narrower at the top and wider at the bottom, designed to match the positioning holes 26. The tapered pin design facilitates insertion into the positioning holes, allows for timely correction, and ensures accurate positioning.

[0033] The base plate assembly 1 further includes a lower heating assembly, which includes a lower heating plate 13 and heating rods 3. The lower heating plate 13 is fixed below the base heating plate 12 and has several transverse through holes, in which heating rods 3 are installed respectively. The upper pressure assembly 2 further includes an upper heating assembly, which includes an upper heating plate 28 and heating rods 3. The upper heating plate 28 is fixed on the air chamber plate 22 and has several transverse through holes, in which heating rods 3 are installed respectively.

[0034] The air chamber cushion 23 is a silicone cushion.

[0035] The rectangular through hole 4 is designed as a four-sided pyramidal hole that is narrow at the top and widens at the bottom.

[0036] The hot-pressing moving plate 10 includes a double-pressing moving plate 101, a spring positioning part 102, a positioning cloth, and a protective cloth. The double-pressing moving plate 101 has two spring grooves near both ends, with a through hole in the center of the bottom of each groove. The spring positioning part 102 includes a spring 1021, an upper positioning cap 1022, and a lower positioning bolt 1023. The spring 1021 is located within the spring groove. The upper positioning cap 1022 has a threaded hole in the center of its lower end. The lower positioning bolt 1023 passes upwards through the through hole at the lower end of the double-pressing moving plate 101, with the spring 1021 sleeved on the outside of the bolt of the lower positioning bolt 1023. The upper end of the lower positioning bolt 1023 is screwed into the upper positioning cap 1022, and the lower end of the upper positioning cap 1022 presses against the spring 1021. The multilayer film 30 includes two... There are two long membranes 31 and three short membranes 312. The two long membranes 31 are inserted between the three short membranes 312 and stacked on the pressure moving plate 101. Two round holes 311 are designed on each side of the long membrane 31. The long membrane 31 is fitted onto the outside of the upper positioning cap 1022 through the round holes 311 on both sides. The two ends of the short membranes 312 abut against the inside of the upper positioning caps 1022 on both sides. The positioning cloth covers the top of the multilayer membrane 30. The positioning cloth has a rectangular hole in the middle. The uppermost short membrane 312 is embedded in the rectangular hole. The bottom of the positioning cloth is pressed on the uppermost long membrane 31. The protective cloth covers the positioning cloth and the outside of the uppermost short membrane 312. The clearance plate 11 has two slots 111 on the upper side for positioning of the lower positioning bolts 1023.

[0037] The aforementioned pressure-adjusting moving plate 101 has a plurality of vacuum adsorption holes 1010 evenly distributed on it. The aforementioned pressure-equalizing membrane electrode assembly composite equipment also includes a vacuum adsorption plate 40 for the heat-adjusting moving plate to adsorb the multilayer membrane 30 of the membrane electrode. The vacuum adsorption plate 40 is designed with an adsorption cavity 401, and an adsorption channel 402 is laid at the bottom of the adsorption cavity 401. A vacuum adsorption interface 403 is designed on one side of the vacuum adsorption plate 40, which is connected to the adsorption channel 402. The vacuum adsorption plate 40 is also designed with a circular groove 404 for positioning the lower positioning bolt of the spring positioning part. The spring positioning part is ingeniously designed to achieve vertical positioning and ensure that subsequent composite does not interfere. It assists in the initial positioning and placement of the multilayer membrane, and quickly positions the lower end with the vacuum adsorption plate. In the later thermal composite process, the upper positioning cap is compressed downward, but still effectively limits the multilayer membrane to prevent movement during thermal composite. The lower positioning bolt and the anti-cavity plate are quickly positioned for convenience and stability.

[0038] The aforementioned pressure equalizing membrane electrode assembly composite equipment also includes a frame 5, a main cylinder 6, an upper crossbeam 7, a slide plate 8, and a worktable 9. The frame 5 is designed with a worktable 9 on it. The upper crossbeam 7 is mounted on the worktable 9 via four columns. The main cylinder 6 is installed in the middle of the upper crossbeam 7. The lower end of the main cylinder 6 is connected to the slide plate 8. The four corners of the slide plate 8 are slidably fitted onto the four columns. The upper pressure assembly 2 is installed below the slide plate. The bottom plate assembly is slidably mounted on the worktable 9. The bottom plate assembly can slide under the upper pressure assembly 2.

[0039] The process of assembling the pressure equalization film electrode assembly.

[0040] The first step is to place the hot-press moving plate 10 on the vacuum adsorption plate 40, and then stack the multilayer mold of the membrane electrode to be composite on the hot-press moving plate 10 in sequence. The vacuum adsorption plate is opened for vacuum adsorption, and the multilayer membrane 30 is adsorbed through the vacuum adsorption hole on the top of the hot-press moving plate 10. The multilayer membrane 30 is also limited on both sides of the hot-press moving plate 10 by the upper positioning pins 27 of the spring positioning part 102. The top of the multilayer membrane 30 is also equipped with a positioning cloth, and a protective cloth is covered on the positioning cloth. The positioning cloth limits the upper short membrane, and the protective cloth protects and covers the top short membrane. The positioning cloth not only has a positioning function, but also fills the gaps between the short membrane and the long membrane on both sides.

[0041] The second step is to stop the vacuum adsorption plate from drawing vacuum, remove the hot pressing moving plate 10 and the membrane electrode to be laminated on it together, and place it above the base plate assembly 1 of the pressure equalizing membrane electrode assembly composite equipment. Position it by inserting the lower positioning bolt of the spring positioning part 102 into the slot 111 on the air-proof plate 11; the multilayer membrane 30 to be laminated then slides into the lower pressing assembly 2 along with the base plate assembly 1.

[0042] In the third step, the main cylinder 6 controls the upper pressing assembly 2 to move downwards, and the upper pressing plate 21 is positioned and engaged with the positioning pins 27 on the bottom heating plate 12 through several positioning holes 26 for precise positioning; the upper pressing plate 21 of the upper pressing assembly 2 is fitted onto the outside of the multilayer film 30 to be laminated and the air-proof plate 11 through the rectangular through hole 4; the air chamber pad 23 is pressed on the protective cloth above the multilayer film 30 to be laminated.

[0043] The fourth step involves the upper and lower heating components starting to heat, adjusting the temperature according to the existing material requirements (0~180℃). Simultaneously, compressed air is introduced through the hole 25 on one side of the air chamber plate 22 of the upper pressure component 2. The specific pressure range is set according to actual requirements; the normal operating pressure range is 0~0.8MPa, and a high-pressure pipeline can also be used to introduce high-pressure air. The compressed air enters the circular groove 24 through the hole 25, and then enters the gap between the air chamber pad 23 and the air chamber plate 22, generating uniform air pressure on the air chamber pad 23. The air chamber pad 23 then uniformly extrudes and laminates the multilayer mold of the membrane electrode below. The holding time is set according to the supply requirements. The air chamber pad can be inflated to uniformly press down, and can also deform and further extrude in areas where the multilayer membrane distribution is uneven. This is mainly because the overall thickness of the two sides of the long membrane is less than that of the middle, so the two sides need to continue to be inflated by the air chamber pad to increase the thickness, thus enabling effective thermal lamination of the two sides of the long membrane.

[0044] Fifth step, stop heating, release compressed air, the main cylinder 6 drives the upper pressure component 2 to rise and reset, the composite membrane electrode and the base plate component slide out from under the upper pressure component 2, take out the hot pressing moving plate 10 and the composite membrane electrode, remove the protective cloth and positioning cloth, take out the composite membrane electrode, and complete the hot composite.

Claims

1. A composite device for a pressure-equalizing membrane electrode assembly, characterized in that, It includes a base plate assembly, an upper pressure assembly, and a hot-pressing movable plate. The upper pressure assembly is designed above the base plate assembly. The upper pressure assembly includes an upper pressure plate, an air chamber plate, and an air chamber pad. The upper pressure plate has a rectangular through-hole in the center. The upper pressure plate is installed below the air chamber plate, and an air chamber pad is installed between the upper pressure plate and the air chamber plate, covering the rectangular through-hole. The upper pressure plate and the air chamber pad form an air chamber. The lower center of the air chamber plate has a circular groove, and a channel is designed on one side of the bottom of the groove, connecting to one side of the air chamber plate. The base plate assembly includes a clearance plate and a bottom heating plate. The clearance plate is installed on top of the bottom heating plate in the center, and the clearance plate is positioned between its perimeter and the bottom heating plate. A ring-shaped step is formed; the upper pressing assembly is pressed onto the bottom plate assembly, with the upper pressing plate pressing on the ring-shaped step position, and the clearance plate extending into the rectangular through hole; the hot-pressing movable plate is detachably installed on the clearance plate, and the multilayer membrane of the membrane electrode is stacked on the hot-pressing movable plate; the hot-pressing movable plate includes a secondary pressing movable plate, a spring positioning part, a positioning cloth, and a protective cloth. Two spring grooves are respectively opened near both ends of the secondary pressing movable plate, and a through hole is opened in the middle of the bottom of the spring groove. The spring positioning part includes a spring, an upper positioning cap, and a lower positioning bolt. The spring is located in the spring groove, and a threaded hole is opened in the middle of the lower end of the upper positioning cap. The lower positioning bolt extends from the lower end of the secondary pressing movable plate... The through hole extends upwards and the spring is sleeved on the outside of the screw of the lower positioning bolt. The upper end of the lower positioning bolt is screwed into the upper positioning cap, and the lower end of the upper positioning cap presses against the spring. The multilayer membrane includes two long membranes and three short membranes. The two long membranes are respectively inserted between the three short membranes and stacked sequentially on the pressure moving plate. Two round holes are designed on each side of the long membrane. The long membrane is sleeved on the outside of the upper positioning cap through the round holes on both sides. The two ends of the short membranes abut against the inside of the upper positioning caps on both sides. The positioning cloth covers the multilayer membrane. A rectangular hole is opened in the middle of the positioning cloth. The uppermost short membrane is embedded in the rectangular hole. The bottom of the positioning cloth presses on the uppermost long membrane. The protective cloth covers the top. The positioning cloth and the outer side of the top short membrane are covered; two slots for positioning the lower positioning bolts are respectively opened on the side of the air-proof plate; the air chamber pad is a silicone pad; the pressure-equalizing membrane electrode assembly composite equipment is evenly distributed with several vacuum adsorption holes. The pressure-equalizing membrane electrode assembly composite equipment also includes a vacuum adsorption plate for the heat-pressing moving plate to adsorb the multilayer membrane of the membrane electrode. The vacuum adsorption plate is designed with an adsorption cavity, and an adsorption channel is laid at the bottom of the adsorption cavity. A vacuum adsorption interface is designed on one side of the vacuum adsorption plate, and the vacuum adsorption interface is connected to the adsorption channel. The vacuum adsorption plate is also designed with a circular groove for positioning the lower positioning bolt of the spring positioning part.

2. The pressure equalization film electrode assembly composite device according to claim 1, characterized in that, The upper pressure plate has several positioning holes around its lower end, and the lower heating plate has several positioning pins around its upper end. The positioning pins are located on the annular step. When pressed, the positioning pins are inserted into the corresponding positioning holes.

3. The pressure equalization film electrode assembly composite device according to claim 2, characterized in that, The positioning hole is designed as a cylindrical hole, and the positioning pin is designed as a tapered pin that is narrower at the top and wider at the bottom, matching the positioning hole.

4. The pressure equalization film electrode assembly composite device according to claim 1, characterized in that, The base plate assembly further includes a lower heating assembly, which includes a lower heating plate and heating rods. The lower heating plate is fixed below the base heating plate and has several transverse through holes, in which heating rods are installed respectively. The upper pressure assembly further includes an upper heating assembly, which includes an upper heating plate and heating rods. The upper heating plate is fixed above the air chamber plate and has several transverse through holes, in which heating rods are installed respectively.

5. The pressure equalization film electrode assembly composite device according to claim 1, characterized in that, The rectangular through hole is designed as a four-sided pyramidal hole that is narrow at the top and widens at the bottom.

6. The pressure equalization film electrode assembly composite device according to claim 1, characterized in that, The aforementioned pressure equalizing membrane electrode assembly composite equipment also includes a frame, a main cylinder, an upper crossbeam, a slide plate, and a worktable. The worktable is designed on the frame, and the upper crossbeam is mounted on the worktable via four columns. The main cylinder is installed in the middle of the upper crossbeam, and the lower end of the main cylinder is connected to a slide plate. The four corners of the slide plate are slidably fitted onto the four columns. The upper pressure assembly is installed under the slide plate, and the bottom plate assembly is slidably mounted on the worktable, with the bottom plate assembly sliding under the upper pressure assembly.

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