Pressure-bearing grate for molecular sieve production

Abstract

The pressure-bearing grate for molecular sieve production comprises a body, and a pull rod is arranged on the body in the axial direction; the one-way limiting assembly comprises one-way ratchets and limiting claws which are matched in a one-way limiting mode, one of the one-way ratchets and the limiting claws is arranged on the pull rod, and the other one of the one-way ratchets and the limiting claws is arranged on a cover body of the screening tower. The positions of the grate and the cover body are kept through cooperation of the limiting assemblies, the compression state of the compression spring is kept, then the grate and the cover body are installed on the tower body together, in this way, the cover body and the grate can be pre-installed firstly, then the cover body is installed on the tower body, special hydraulic auxiliary equipment is not needed, and installation is more convenient.

Description

Technical Field

[0001] This invention relates to the field of oxygen generator technology, and more particularly to a pressure grate for molecular sieve production. Background Technology

[0002] The oxygen generator includes two adsorption towers, each containing a molecular sieve and an opening covered by a cover. A pressure-bearing grate is installed at the opening of the adsorption tower, and a compression spring is installed between the grate and the cover. The compression spring provides pressure to the grate, which in turn provides continuous pressure to the molecular sieve below.

[0003] When assembling the adsorption tower, the cover needs to be pressed to compress the spring in order to install it in place. At this time, a hydraulic press is required to assist in the installation. When replacing the internal molecular sieve, the cover needs to be disassembled. After removing the screws that fix the cover, the cover will quickly spring back under the elastic force of the spring. This poses a risk of injury if the user is inexperienced. Therefore, hydraulic equipment and other auxiliary tools are also needed to assist in disassembly. Both installation and disassembly are inconvenient and make it difficult to replace and maintain the molecular sieve. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems by providing a pressure grate for molecular sieve production.

[0005] To achieve the above objectives, the technical solution of the present invention is: a pressure grate for molecular sieve production, comprising: The main body, along the axial direction, has a tie rod installed on it; A one-way limiting component includes a one-way ratchet and a limiting claw that engage in one-way limiting. One of the one-way ratchet and the limiting claw is disposed on a pull rod, and the other is disposed on the cover of the screening tower.

[0006] Furthermore, the cover body is provided with a cylindrical body, and a first piston is slidably provided inside the cylindrical body. The upper end of the pull rod is guided through the first piston, and a limiting surface is provided at the upper end of the pull rod passing through the first piston. The limiting surface faces the first piston.

[0007] Furthermore, along the radial direction of the cylinder, the limiting pawl is guided and disposed on the cylinder, the ratchet is an annular structure coaxially disposed on the outer circumferential surface of the pull rod, and a first elastic element is disposed between the limiting pawl and the cylinder.

[0008] Furthermore, the pull rod and the cylinder are both coaxially arranged with the main body, and the limiting claws include two symmetrically arranged on both sides of the pull rod.

[0009] Furthermore, the upper end of the cylinder is provided with a first port, which is used to connect with the air inlet of the oxygen generator's air pump, and a first solenoid valve is provided between the first port and the air pump.

[0010] Furthermore, the limiting claw is driven by a driving component, which is used to drive the limiting claw to move away from the pull rod.

[0011] Furthermore, the drive assembly includes a piston cylinder, a piston rod, and a second piston disposed on the cover. The piston rod is connected to the limiting claw. A second port is provided at one end of the piston cylinder near the limiting claw. The second port is used to communicate with the air outlet of the air pump, and a second solenoid valve is provided between the second port and the air pump.

[0012] Furthermore, the limiting claw is provided with a guide hole, the piston rod is guided and engaged with the guide hole, a third limiting nut is provided at the end of the piston rod passing through the guide rod, and the first elastic element is a compression spring sleeved on the piston rod.

[0013] Furthermore, it also includes a connecting pipe installed on the cover, one end of which is connected to two piston cylinders, and the other end of which is connected to a second port.

[0014] Furthermore, the air pump's air inlet is also provided with a second air passage that communicates with the atmosphere, and a fourth solenoid valve is provided on the second air passage.

[0015] The pressure-bearing grate for molecular sieve production disclosed in this invention has the following advantages compared with the prior art: This application provides a tie rod on the grate body and a limiting component between the cover and the tie rod. When the grate and cover need to be installed on the tower body, the tie rod is guided to the cover, and a compression spring is placed between the grate and the cover. One of the grate and the cover is placed on a horizontally positioned support surface, and then a vertically downward pressure is applied to the other, compressing the compression spring. During this process, the tie rod moves towards the cover and is limited by the one-way limiting component. After compressing the compression spring a certain distance, the pressure is released. At this time, the position of the grate and the cover is maintained by the limiting component, keeping the compression spring compressed. Then, the grate and the cover are installed together on the tower body. This method allows for pre-installation of the cover and grate before installing the cover on the tower body, eliminating the need for dedicated hydraulic auxiliary equipment and making installation more convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the screening tower in this invention. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the overall structure of the screening tower in this invention. Figure 2 .

[0018] Figure 3 This is a schematic diagram of the structure when the sieve tower cover is separated from the tower body in this invention.

[0019] Figure 4This is a side view of the structure of the cover and the grate assembly in a pressure-bearing grate for molecular sieve production according to the present invention.

[0020] Figure 5 This is a schematic cross-sectional view of the cover and grate assembly in a pressure-bearing grate for molecular sieve production according to the present invention. Figure 1 .

[0021] Figure 6 This is a schematic cross-sectional view of the cover and grate assembly in a pressure-bearing grate for molecular sieve production according to the present invention. Figure 2 .

[0022] Figure 7 This is a schematic diagram of the structure of a pressure-bearing grate for molecular sieve production according to the present invention.

[0023] Figure 8 This is a schematic cross-sectional view of a pressure-bearing grate for molecular sieve production according to the present invention.

[0024] Figure 9 for Figure 8 The diagram shown is a partially enlarged view of point A in a pressure grate for molecular sieve production according to the present invention.

[0025] Figure 10 for Figure 9 The diagram shown is a partially enlarged structural schematic of point B in a pressure grate for molecular sieve production according to the present invention.

[0026] In the diagram: 1. Tower body; 10. Base; 11. Air inlet; 110. Electromagnetic switching valve; 2. Cover; 20. Cylinder; 201. End cap; 21. Oxygen outlet; 22. First port; 221. First solenoid valve; 23. Second port; 230. Connecting pipe; 231. Second solenoid valve; 232. Third solenoid valve; 24. First piston; 25. Limiting claw; 251. First elastic element; 252. Guide hole; 26. Drive assembly; 260 1. Piston cylinder; 261. Piston rod; 262. Second compression spring; 263. Third port; 264. Second piston; 265. Permanent magnet; 266. Inertial component; 267. First limiting nut; 268. Second elastic component; 269. Third limiting nut; 3. Air pump; 31. First air passage; 32. Second air passage; 320. Fourth solenoid valve; 4. Grate; 41. Pull rod; 42. One-way ratchet; 43. Second limiting nut; 5. Compression spring. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0028] Example 1 Please refer to Figures 7-9 The technical solution of the present invention is: a pressure-bearing grate 4 for molecular sieve production, comprising: The main body, along the axial direction, is provided with a tie rod 41, which is guided and engaged with the cover 2 of the screening tower; The one-way limiting component includes a one-way ratchet 42 and a limiting claw 25 for one-way limiting engagement. One of the one-way ratchet 42 and the limiting claw 25 is disposed on the pull rod 41, and the other is disposed on the cover 2 of the screening tower.

[0029] Specifically, it should be noted that the reference is... Figures 1-6 The oxygen generator includes sieving towers, and each oxygen generator includes two sieving towers. Each sieving tower includes a tower body 1, a base 10, and a cover 2. The base 10 has an air inlet 11 connecting to the bottom of the sieving tower. In use, the tower body 1 is used to house molecular sieves. The cover 2 is detachably installed at the upper end of the tower body 1. A grate 4 is positioned between the molecular sieve and the cover 2. A compression spring 5 is installed between the grate 4 and the cover 2. The grate 5 is compressed by... Spring 5 provides elastic force to the grate 4, thereby pressing the molecular sieve below. This application provides a pull rod 41 to the grate 4 body, with the cover 2 and pull rod 41 axially guided and engaged. A limiting component is provided between the cover 2 and pull rod 41. With this arrangement, when the grate 4 and cover 2 need to be installed on the tower body 1, the pull rod 41 is guided and engaged with the cover 2, and the compression spring 5 is positioned between the grate 4 and cover 2, thus pressing the grate 4 and cover 2 together. One of the two is placed on a horizontally positioned support surface, and then a vertical downward pressure is applied to the other, compressing the compression spring 5. During this process, the pull rod 41 moves towards the cover 2 and is limited by the one-way limiting component. After compressing the compression spring 5 a certain distance, the pressure is released. At this time, the position of the grate 4 and the cover 2 is maintained by the limiting component, keeping the compression spring 5 in a compressed state. Then, the grate 4 and the cover 2 are installed together on the tower body 1. In this way, the cover 2 and the grate 4 can be pre-installed first, and then the cover 2 can be installed on the tower body 1. No special hydraulic auxiliary equipment is needed, and it can be done in any place, making the installation more convenient. After the cover 2 is installed on the tower body 1, the one-way limiting component is released. At this time, under the elastic force of the compression spring 5, the grate 4 is pushed down. After the grate 4 presses against the molecular sieve below, the screening tower is ready for use.

[0030] Furthermore, as a specific implementation method, refer to Figures 4-6The cover 2 has a cylindrical body 20, and a first piston 24 is slidably mounted inside the cylindrical body 20. The upper end of the pull rod 41 passes through the first piston 24, and a limiting surface is provided at the upper end of the pull rod 41 passing through the first piston 24. The limiting surface faces the first piston 24. Specifically, the cylindrical body 20 is integrally mounted on the cover 2, with both the upper and lower ends of the cylindrical body 20 extending out of the cover 2. The first piston 24 is slidably mounted inside the cover 2, and the upper end of the pull rod 41 of the first piston 24 is guided and engaged with the first piston 24. Through this arrangement, the guide rod and the cover 2 form a guiding engagement. A first limiting nut 267 is threadedly connected to the upper end of the pull rod 41, and the limiting surface is the end face of the first limiting nut 267. An end cap 201 is provided at the upper end of the cylindrical body 20. Figure 5 This is a schematic diagram showing the state of the first piston 24 when the grate 4 is pressing and tightening the molecular sieve below. At this time, the second limiting nut 43 is in contact with the first piston 24 below. With this setting, when it is necessary to disassemble the cover 2 to replace or maintain the internal molecular sieve, the area between the upper end of the cylinder 20 and the first piston 24 can be sealed. A sealing air chamber is set above the first piston 24, and then the cover 2 is disassembled. At this time, the pressure spring 5 is prevented from rebounding instantly by the dual resistance of the one-way limiting component and the sealing air chamber, thereby avoiding the safety hazards caused by the rapid rebound of the pressure spring 5 and improving safety.

[0031] Furthermore, as a specific implementation, the limiting claw 25 is guided and disposed on the cylinder 20 along the radial direction of the cylinder 20, the ratchet is an annular structure coaxially disposed on the outer circumferential surface of the pull rod 41, and a first elastic element 251 is disposed between the limiting claw 25 and the cylinder 20.

[0032] refer to Figure 5 A ring plate is provided at the lower end of the cylinder 20. A limiting pawl 25 is guided and disposed on the upper surface of the ring plate. The ratchet is an annular ratchet integrally disposed on the outer circumferential surface of the pull rod 41. The limiting pawl 25 is radially guided and slidably disposed on the upper surface of the ring plate. The first elastic element 251 provides elastic force to the limiting pawl 25 to move closer to the pull rod 41. The elastic force of the first elastic element 251 squeezes the limiting pawl 25 against the ratchet to form a one-way limiting. By providing an annular ratchet, it can cooperate with the limiting pawl 25 at any angle.

[0033] Furthermore, as a preferred embodiment, refer to Figures 7-9 The pull rod 41 and the cylinder 20 are both coaxially arranged with the main body, and the limiting claws 25 include two symmetrically arranged on both sides of the pull rod 41. By providing two limiting claws 25, the pull rod 41 can be unidirectionally limited from both sides, improving the stability of the limiting.

[0034] Furthermore, as a specific implementation method, refer to Figures 1-7The upper end of the cylinder 20 is provided with a first port 22, which is used to connect with the air inlet of the oxygen concentrator's air pump 3. A first solenoid valve 221 is provided between the first port 22 and the air pump 3. Specifically, an end cover 201 is detachably provided at the upper end of the cylinder 20. The end cover 201 is provided with a first port 22 connecting the cylinder 20. The first port 22 is connected with the air inlet of the oxygen concentrator's air pump 3. A first solenoid valve 221 is provided on the air path connecting the first port 22 and the air pump 3. The first solenoid valve 221 is normally closed. Before the cover 2 and the grate 4 are installed on the tower body 1, the end cover 201 is separated from the cylinder 20. At this time, a one-way valve is used to close the gap. The positioning component cooperates with the pull rod 41 to limit the position. After the cover 2 and grate 4 are installed on the tower body 1, the end cover 201 is installed on the cylinder 20, and the air pump 3 and the first port 22 are connected. The air outlet of the air pump 3 is then separated from the screening tower. At this time, the air pump 3 works and controls the first solenoid valve 221 to open. When the air pump 3 works, it can generate negative pressure at the first port 22, thereby creating a pressure difference on both sides of the first piston 24. Under the action of the pressure difference, the first piston 24 is pushed to move to... Figure 5 The state shown is then closed, and the first solenoid valve 221 is closed. The air pump 3 then stops working. After connecting the air outlet of the air pump 3 to the screening tower, it can be used.

[0035] Furthermore, as a specific implementation, the limiting claw 25 is driven by a driving assembly 26, which drives the limiting claw 25 to move away from the pull rod 41. Specifically, by setting the driving assembly 26, after the cover 2 and the grate 4 are installed on the screening tower, the driving assembly 26 can drive the limiting claw 25 to move, separating it from the one-way ratchet 42, releasing the one-way limiting of the pull rod 41, so that the grate 4 can move under the elastic force of the compression spring 5 to squeeze the molecular sieve.

[0036] Furthermore, as a specific implementation method, refer to Figures 5-9 The specific structure of the drive assembly 26 is as follows: The drive assembly 26 includes a piston cylinder 260, a piston rod 261 and a second piston 264 disposed on the cover 2. The piston rod 261 is connected to the limiting claw 25. A second port 23 is provided at one end of the piston cylinder 260 near the limiting claw 25. The second port 23 is used to communicate with the air outlet of the air pump 3, and a second solenoid valve 231 is provided between the second port 23 and the air pump 3.

[0037] Specifically, the drive assembly 26 includes a piston cylinder 260 mounted on the cylinder body 20. A piston rod 261 is guided to one end of the piston cylinder 260 near the pull rod 41. A second piston 264 is disposed inside the piston cylinder 260. One end of the piston rod 261 is connected to the limiting claw 25, and the other end is connected to the second piston 264. A third port 263 is provided on the side wall of the piston cylinder 260. The third port 263 is connected to the second port 23 via a connecting pipe 230. The second port 23 is connected to the pump outlet of the air pump 3 via an air pipe. A second solenoid valve 231 is provided on the connecting pipe 230 between the second port 23 and the air pump 3. The normal state of the second solenoid valve 231 is the closed state. The initial state of the second piston 264 and the piston rod 261 is as follows: Figure 9 As shown, the second piston 264 is located at the end of the piston cylinder 260 near the limiting claw 25. At this time, under the elastic force of the first elastic element 251, the limiting claw 25 can limit the one-way ratchet 42. After the grate 4 and the cover 2 are installed on the tower body 1, the air pump 3 is connected to the first port 22 and the second port 23. The air pump 3 is separated from the air inlet 11 on the tower body 1. Then, the second solenoid valve 231 is opened and the first solenoid valve 221 is kept closed. When the air pump 3 is working, it draws in external gas and pumps out gas with a certain pressure from the outlet. The gas enters the piston cylinder 260, which increases the gas pressure in the piston cylinder 260. Under the action of the gas pressure, the second piston 264 is pushed to move. The second piston 264 drives the piston rod 261 to move, which drives the limiting claw 25 to move, releasing the one-way ratchet 42. At this time, under the elastic force of the compression spring 5, the grate 4 is pushed down to squeeze the molecular sieve below.

[0038] Furthermore, in order to ensure that the one-way limit component can be fully opened, the second solenoid valve 231 can be opened and closed repeatedly multiple times, with an interval of 1-2 seconds between two adjacent openings. Repeated opening can create reciprocating pulse air pressure, increasing the probability of opening the one-way limit component.

[0039] Furthermore, as a specific implementation method, refer to Figure 9 The limiting claw 25 is provided with a guide hole 252, and the piston rod 261 is guided and engaged with the guide hole 252. A third limiting nut 269 is provided at the end of the piston rod 261 that passes through the guide rod. The first elastic element 251 is a compression spring sleeved on the piston rod 261. Specifically, with this arrangement, the entire structure is compact and simple, and the limiting claw 25 can be guided by the piston rod 261. The first elastic element 251 is a compression spring sleeved on the piston rod 261, and its two ends abut against the ends of the piston cylinder 260 and the guide hole 252, respectively.

[0040] Furthermore, as a specific implementation method, refer to Figure 7It also includes a connecting pipe 230 disposed on the cover 2. One end of the connecting pipe 230 is connected to the two piston cylinders 260, and the other end is connected to the second port 23. Specifically, the connecting pipe 230 is a metal pipe integrally welded to the cover 2. One end of the metal pipe is welded to the side wall of the piston cylinder 260, and the other end extends through the cover 2 to the top of the rod cover 2, so as to facilitate communication with the external air pump 3.

[0041] Example 2 It is understandable that, because the one-way limiting assembly uses the cooperation of the limiting claw 25 and the one-way ratchet 42 for one-way limiting, during limiting, the first elastic element 251 provides elastic force, causing the limiting claw 25 and the one-way ratchet 42 to press against each other, and there is friction at the contact point. However, the air pressure generated by the air pump 3 is limited, and the size of the piston cylinder 260 is limited. Therefore, when the second solenoid valve 231 opens, it may not be able to effectively drive the second piston 264 to pull the piston rod 261, thereby causing the limiting claw 25 to release the limiting position. To address the above problems, refer to Figure 10 The technical solution of the present invention is as follows: a pressure-bearing grate 4 for molecular sieve production, which differs from Embodiment 1 in that, as a further improvement, a permanent magnet 265 is fixedly provided at the end of the piston cylinder 260, an inertial element 266 is slidably provided on the piston rod 261, a second elastic element 268 is provided between the inertial element 266 and the second piston 264, the second piston 264 is slidably and sealed with the piston rod 261, a first limiting nut 267 is provided at the end of the piston rod 261, a second compression spring 262 is provided between the first limiting nut 267 and the second piston 264, wherein the second compression spring 262 is also a compression spring 5, and the elastic coefficient of the second compression spring 262 is greater than the elastic coefficient of the first elastic element 251, for reference. Figure 10 The second elastic element 268 is an elastic ring, with its two ends respectively connected to the inertial element 266 and the second piston 264, for reference. Figure 8In the initial state, the permanent magnet 265 is magnetically connected to the inertial component 266, and the limiting claw 25 is unidirectionally limited by the one-way ratchet 42. At this time, the first elastic component 251 and the second compression spring 262 are both in a compressed state. At this time, the third limiting nut 269 is in contact with the end of the guide hole 252. When it is necessary to contact the limiting claw 25 and the one-way ratchet 42, the second solenoid valve 231 is opened, which increases the air pressure in the piston cylinder 260. Under the action of air pressure, the second piston 264 is pushed to compress the second compression spring 262 and apply a thrust to the piston rod 261. The inertial component 266 is attracted by the permanent magnet 265 and will not move. The second elastic component 268 is stretched. As the stretch of the second elastic component 268 increases, the elastic force increases. The magnetic force of the permanent magnet 265 is controlled to ensure that the second piston 264 is pushed by the air pressure supplied by the air pump 3 at the end of the movement (for example, when the inertial component 266 and the permanent magnet 265 are fixedly connected). When they cannot be separated, under the action of the air pressure P supplied by the air pump 3, the second piston 264 can resist the elastic force of the second compression spring 262 and the second elastic element 268 and move a maximum distance L along the axis. The magnetic attraction between the permanent magnet 265 and the inertial element 266 is controlled. When the second piston 264 moves a distance of L-(2-3) mm under the action of the air pressure P supplied by the air pump 3, the elastic force of the second elastic element 268 is equal to the magnetic force between the permanent magnet 265 and the inertial element 266. The elastic force of the second elastic element 268 is equal to the magnetic force of the permanent magnet 265 on the inertial element 266. During the movement of the second piston 264, the inertial element 266 separates from the permanent magnet 265. Under the action of the elastic force of the second elastic element 268, the inertial element 266 moves and impacts the second piston 264. When impacted, it can increase the force applied by the second piston 264 to the piston rod 261, thereby ensuring that the drive limit claw 25 separates from the one-way ratchet 42.

[0042] Furthermore, as a specific implementation, the air inlet 11 of the air pump 3 is also provided with a second air passage 32 communicating with the atmosphere, and a fourth solenoid valve 320 is provided on the second air passage 32. Specifically, the normal state of the fourth solenoid valve is the open state. By setting the fourth solenoid valve 320, when the limiting pawl 25 releases the one-way ratchet 42, the fourth solenoid valve 320 can be closed and the second solenoid valve 231 can be opened. By generating a negative pressure above the first piston 24, a pressure difference can be generated on both sides of the first piston 24. Under the action of the pressure difference, the first piston 24 can be pushed to move upward, thereby pulling the pull rod 41 to resist the elastic force of the compression spring 5, reducing the pressure between the one-way ratchet 42 and the limiting pawl 25, which is more conducive to the separation of the one-way ratchet 42 and the limiting pawl 25.

[0043] For details, please refer to Figure 1A third solenoid valve 232 is installed between the air pump 3 and the two second solenoid valves 231. The third solenoid valve 232 is normally closed. By installing the third solenoid valve 232, when the one-way limit components of the two screening towers are in contact with the limit, the two second solenoid valves 231 can be opened first, and then the third solenoid valve 232 can be controlled to synchronously control the air path switching of the one-way limit components in the two screening towers.

[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A pressure grate for molecular sieve production, characterized in that, include: The main body, along the axial direction, is provided with a tie rod (41). The one-way limiting component includes a one-way ratchet (42) and a limiting claw (25) for one-way limiting engagement. One of the one-way ratchet (42) and the limiting claw (25) is disposed on the pull rod (41), and the other is disposed on the cover (2) of the screening tower.

2. The pressure grate for molecular sieve production according to claim 1, characterized in that, The cover (2) is provided with a cylinder (20), and a first piston (24) is slidably provided inside the cylinder (20). The upper end of the pull rod (41) is guided through the first piston (24). The upper end of the pull rod (41) passing through the first piston (24) is provided with a limiting surface, and the limiting surface is set facing the first piston (24).

3. A pressure grate for molecular sieve production according to claim 2, characterized in that, Along the radial direction of the cylinder (20), the limiting claw (25) is guided and disposed on the cylinder (20), the ratchet is an annular structure coaxially disposed on the outer circumferential surface of the pull rod (41), and a first elastic element (251) is disposed between the limiting claw (25) and the cylinder (20).

4. A pressure grate for molecular sieve production according to claim 3, characterized in that, The pull rod (41) and the cylinder (20) are both coaxially arranged with the main body, and the limiting claw (25) includes two symmetrically arranged on both sides of the pull rod (41).

5. A pressure grate for molecular sieve production according to claim 3 or 4, characterized in that, The upper end of the cylinder (20) is provided with a first port (22), which is used to connect with the air inlet of the air pump (3) of the oxygen generator, and a first solenoid valve (221) is provided between the first port (22) and the air pump (3).

6. A pressure grate for molecular sieve production according to claim 5, characterized in that, The limiting claw (25) is driven by a driving component (26), which is used to drive the limiting claw (25) to move away from the pull rod (41).

7. A pressure grate for molecular sieve production according to claim 6, characterized in that, The drive assembly (26) includes a piston cylinder (260), a piston rod (261) and a second piston (264) disposed on the cover (2). The piston rod (261) is connected to the limiting claw (25). A second port (23) is provided at one end of the piston cylinder (260) near the limiting claw (25). The second port (23) is used to communicate with the air outlet of the air pump (3). A second solenoid valve (231) is provided between the second port (23) and the air pump (3).

8. A pressure grate for molecular sieve production according to claim 7, characterized in that, The limiting claw (25) is provided with a guide hole (252), the piston rod (261) is guided and engaged with the guide hole (252), and a third limiting nut (269) is provided at the end of the piston rod (261) that passes through the guide rod. The first elastic element (251) is a compression spring sleeved on the piston rod (261).

9. A pressure grate for molecular sieve production according to claim 8, characterized in that, It also includes a connecting pipe (230) set on the cover (2), one end of the connecting pipe (230) is connected to the two piston cylinders (260), and the other end is connected to the second port (23).

10. A pressure grate for molecular sieve production according to claim 9, characterized in that, The air pump (3) is also provided with a second air passage (32) connected to the atmosphere at its air inlet (11), and a fourth solenoid valve (320) is provided on the second air passage (32).

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