A hydrogen purification device that can prevent hydrogen from igniting and exploding.

Abstract

This utility model discloses a hydrogen purification device that can prevent hydrogen combustion and explosion, relating to the technical field of hydrogen purification equipment. It includes a processing chamber with a hollow cavity on its inner wall. A feed pipe penetrating the inner wall of the hollow cavity is connected to the top of the processing chamber, and a flange is rotatably connected to the top of the feed pipe. The beneficial effects of this utility model are: through the hollow cavity, in conjunction with the cooler body and exhaust fan inside the outer shell, a continuous cooling cycle can be formed. The cooler body provides a cold source for the system, and the exhaust fan promotes airflow, delivering cooling gas to the hollow cavity via a gas guide pipe. This effectively reduces the temperature of the hydrogen inside the processing chamber, preventing combustion and explosion due to excessive temperature, greatly improving the safety of the device. Regarding purification efficiency, hydrogen enters from the feed pipe and is evenly dispersed into the processing chamber through multiple sets of through-holes at the bottom of the discharge pipe, allowing for more thorough contact with the purified substance and improving purification efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrogen purification equipment, and in particular to a hydrogen purification device that can prevent hydrogen from igniting and exploding. Background Technology

[0002] Hydrogen purification is the process of removing impurities from hydrogen to obtain high-purity hydrogen. Common methods include: low-temperature adsorption, which utilizes the selective adsorption of impurities by an adsorbent at low temperatures; catalytic conversion, which uses a catalyst to chemically react impurities into easily separable substances; and membrane separation, which uses the selective permeation difference of a specific membrane to separate hydrogen and impurities. The purified high-purity hydrogen can reach 99.99% or even higher purity and is widely used in electronics, chemical, and energy fields. It can meet the high hydrogen quality requirements of precision manufacturing and fuel cells, ensuring product quality and performance stability.

[0003] During hydrogen purification, the purification reaction is usually accompanied by heat release, or the hydrogen itself may be at a high temperature when entering the purification device. This can lead to an increase in hydrogen temperature, and the high-temperature environment further increases the risk of hydrogen combustion and explosion. This not only threatens production safety but may also affect the hydrogen purification effect and the stable operation of the device. However, existing hydrogen purification devices usually use simple cooling methods, but the cooling effect is poor and cannot dissipate the heat generated during the purification process in time, causing the hydrogen temperature to rise continuously and increasing the risk of combustion and explosion. At the same time, the uneven distribution of hydrogen when entering the device prevents it from fully contacting the purified substance, affecting the purification effect and also causing safety hazards due to excessively high local hydrogen concentrations. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A hydrogen purification device that can prevent hydrogen combustion and explosion includes a processing box, the inner wall of which is provided with a hollow cavity, the top of which is connected to a feed pipe that penetrates the inner wall of the hollow cavity, and the top end of the feed pipe is rotatably connected to a flange, the bottom end of which is installed with a discharge pipe, and the bottom of the discharge pipe has multiple sets of through holes, and the connection between the feed pipe and the discharge pipe is provided with a snap-fit ​​component.

[0007] The back of the processing box is equipped with an outer shell, and an exhaust fan and a cooler body are installed inside the outer shell. Two sets of air guide pipes are connected to the inner wall of the outer shell, and one end of the air guide pipe is connected to the inner wall of the hollow cavity.

[0008] The snap-fit ​​assembly includes a snap-fit ​​ring fixed to the outside of the feed pipe, a sliding groove on the inner wall of the snap-fit ​​ring, a snap-fit ​​groove on the inner wall of the sliding groove, a buckle fixed to the outside of the discharge pipe, the outer side of the buckle being slidably connected to the inner wall of the sliding groove and snapping into the inner wall of the snap-fit ​​groove, and a sealing gasket fixed to the top of the discharge pipe, the outer side of the sealing gasket being in contact with the bottom of the feed pipe.

[0009] As a preferred embodiment of the hydrogen purification device that can prevent hydrogen combustion and explosion according to the present invention, wherein: a sealing door is hinged to one side of the processing box, a sealing strip is fixed to the inner wall of the sealing door, a groove is opened on the inner wall of the processing box, and the outer side of the sealing strip fits into the inner wall of the groove.

[0010] As a preferred embodiment of the hydrogen purification device that can prevent hydrogen combustion and explosion described in this utility model, the bottom of the processing box is provided with two sets of funnels, the bottom of the funnels is connected to a discharge pipe, and a control valve is provided on the outside of the discharge pipe.

[0011] As a preferred embodiment of the hydrogen purification device that can prevent hydrogen combustion and explosion described in this utility model, wherein: both sides of the processing box are provided with exhaust ports for discharging heat from the hollow cavity, and the inner wall of the exhaust port is equipped with a filter screen; the top of the processing box is connected to an exhaust pipe that penetrates the inner wall of the hollow cavity, and a control valve and a flange are respectively provided on the outer side and the top of the exhaust pipe.

[0012] As a preferred embodiment of the hydrogen purification device that can prevent hydrogen combustion and explosion according to the present invention, the top of the processing box is equipped with a protective shell, and a motor is installed inside the protective shell.

[0013] As a preferred embodiment of the hydrogen purification device that can prevent hydrogen combustion and explosion according to this utility model, the output end of the motor is fixed with a worm gear, the outer side of the feed pipe is fixed with a worm wheel, and the inner wall of the worm wheel is meshed with the outer side of the worm gear.

[0014] As a preferred embodiment of the hydrogen purification device that can prevent hydrogen combustion and explosion according to the present invention, wherein: a limiting frame is fixed at the air inlet of the outer shell, an air vent is provided on the inner wall of the limiting frame, a sieve plate is slidably connected to the inner wall of the limiting frame, and a pull rod is fixed on one side of the sieve plate.

[0015] In summary, this utility model has the following beneficial effects:

[0016] 1. Through the hollow cavity, in conjunction with the refrigerator body and exhaust fan inside the outer shell, a continuous cooling cycle can be formed. The refrigerator body provides a cold source for the system, and the exhaust fan promotes airflow, delivering cooling gas to the hollow cavity through the gas guide pipe. This effectively reduces the temperature of hydrogen in the processing chamber, preventing combustion and explosion conditions due to excessive temperature, and greatly improving the safety of the device. In terms of purification effect, hydrogen enters from the feed pipe and is evenly dispersed into the processing chamber through multiple sets of through holes at the bottom of the discharge pipe, allowing for more thorough contact with the purified substance and improving purification efficiency.

[0017] 2. The flange at the top of the feed pipe allows for easy connection and disassembly with external hydrogen delivery pipelines. The sliding groove and snap-fit ​​groove of the snap-fit ​​ring engage with the snap-fit ​​of the discharge pipe, enabling quick connection and fixation of the feed and discharge pipes. At the same time, the sealing gasket prevents hydrogen leakage at the connection point, ensuring the airtightness of the device. The outer casing provides installation space for the exhaust fan and the cooler body, protecting the internal equipment. While ensuring the quality of hydrogen purification, it effectively prevents hydrogen combustion and explosion, providing a safe and efficient environment for the hydrogen purification process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a structural diagram of a hydrogen purification device that can prevent hydrogen from exploding.

[0020] Figure 2 This is a structural diagram of the hollow cavity of a hydrogen purification device that can prevent hydrogen combustion and explosion.

[0021] Figure 3 This is a structural diagram of the processing box of a hydrogen purification device that can prevent hydrogen combustion and explosion.

[0022] Figure 4 This is a structural diagram of the cooler in a hydrogen purification device that can prevent hydrogen from exploding.

[0023] Figure 5 This is a structural diagram of the protective shell of a hydrogen purification device that can prevent hydrogen from igniting and exploding.

[0024] Figure 6 This is a structural diagram of the snap-fit ​​assembly of a hydrogen purification device that can prevent hydrogen combustion and explosion.

[0025] The following are the labeling elements in the diagram: 1. Processing box; 2. Hollow cavity; 3. Feed pipe; 4. Discharge pipe; 5. Snap-fit ​​assembly; 51. Snap-fit ​​ring; 52. Slide groove; 53. Snap-fit ​​groove; 54. Buckle; 55. Sealing gasket; 6. Outer shell; 7. Exhaust fan; 8. Refrigerator body; 9. Air guide pipe; 10. Sealing door; 11. Sealing strip; 12. Groove; 13. Funnel; 14. Discharge pipe; 15. Exhaust port; 16. Exhaust pipe; 17. Protective shell; 18. Motor; 19. Worm gear; 20. Worm wheel; 21. Limit frame; 22. Vent; 23. Screen plate. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0029] Example 1:

[0030] Reference Figures 1-6 This is the first embodiment of the present invention. This embodiment provides a hydrogen purification device that can prevent hydrogen combustion and explosion. It includes a processing box 1, a hollow cavity 2 provided on the inner wall of the processing box 1, a feed pipe 3 that penetrates the inner wall of the hollow cavity 2 and is connected to the top of the processing box 1. A flange is rotatably connected to the top of the feed pipe 3, and a discharge pipe 4 is installed at the bottom of the feed pipe 3. Multiple sets of through holes are opened at the bottom of the discharge pipe 4. A snap-fit ​​component 5 is provided at the connection between the feed pipe 3 and the discharge pipe 4.

[0031] The processing chamber 1 serves as the main site for hydrogen purification, providing space for the installation and operation of internal components. It accommodates various reactions and material processing during the hydrogen purification process. The hollow cavity 2 forms a relatively independent space to contain the cooling medium. By contacting the inner wall of the processing chamber 1, the medium cools the hydrogen inside, preventing it from reaching combustion and explosion conditions due to excessive temperature. This provides safety protection and temperature regulation. The feed pipe 3 serves as the channel for hydrogen to enter the processing chamber 1. The flange at its top facilitates connection and disassembly with external hydrogen delivery pipelines, making the installation, maintenance, and repair of the device convenient. After entering through the feed pipe 3, the hydrogen is evenly dispersed into the processing chamber 1 through multiple sets of through holes at the bottom of the discharge pipe 4, allowing the hydrogen to come into more complete contact with the purified substances inside the processing chamber 1, thus improving the purification effect. The snap-fit ​​assembly 5 connects the feed pipe 3 and the discharge pipe 4 through its internal structure.

[0032] The back of the processing box 1 is equipped with an outer shell 6. Inside the outer shell 6, an exhaust fan 7 and a cooler body 8 are installed respectively. The inner wall of the outer shell 6 is connected to two sets of air guide pipes 9, and one end of the air guide pipe 9 is connected to the inner wall of the hollow cavity 2.

[0033] The outer casing 6 provides installation space for the exhaust fan 7 and the cooler body 8, protecting the internal equipment. The exhaust fan 7 generates airflow through rotation, promoting air circulation within the outer casing 6. It then transports the gas cooled by the cooler body 8 through the air duct 9 into the hollow cavity 2, simultaneously expelling the heat-absorbing gas from the hollow cavity 2, forming a continuous cooling cycle and enhancing the cooling effect on the hydrogen in the processing chamber 1. The cooler body 8 cools the air entering the outer casing 6, providing a cold source for the entire cooling system and ensuring that the gas entering the hollow cavity 2 through the air duct 9 reaches a sufficient temperature. The temperature is low enough to effectively reduce the temperature of hydrogen in the processing chamber 1, preventing hydrogen combustion and explosion. The gas guide pipe 9 serves as a channel for cooling gas flow, used to transport the gas cooled by the cooler body 8 inside the outer shell 6 to the hollow cavity 2. It should be noted that the working principle of the cooler body 8 in this case is the same as that of the cooler in the silane purification preparation device of the authorized case application CN202421733865.4. The working principle of the cooler in this comparative case is not described in detail. Therefore, it can be seen that the working principle of the cooler body 8 is prior art, and will not be elaborated further here.

[0034] The snap-fit ​​assembly 5 includes a snap-fit ​​ring 51 fixed to the outside of the feed pipe 3. The inner wall of the snap-fit ​​ring 51 is provided with a sliding groove 52 and the inner wall of the sliding groove 52 is provided with a snap-fit ​​groove 53. A buckle 54 is fixed to the outside of the discharge pipe 4, and the outer side of the buckle 54 is slidably connected to the inner wall of the sliding groove 52 and snap-fitted to the inner wall of the snap-fit ​​groove 53. A sealing gasket 55 is fixed to the top of the discharge pipe 4, and the outer side of the sealing gasket 55 is in contact with the bottom of the feed pipe 3.

[0035] The snap ring 51 is designed to provide an installation base for other snap-fit ​​components. The slide groove 52 is designed to provide a sliding track for the snap fastener 54, allowing the discharge pipe 4 to be smoothly connected and installed with the feed pipe 3. When the snap fastener 54 slides to the snap groove 53, it can firmly fix the discharge pipe 4 to the feed pipe 3, preventing the discharge pipe 4 from falling off during use and ensuring the stability and sealing of the device. The snap fastener 54, through its cooperation with the slide groove 52 and the snap groove 53, can achieve quick connection and fixation between the discharge pipe 4 and the feed pipe 3. The sealing gasket 55 can seal the connection between the feed pipe 3 and the discharge pipe 4, preventing hydrogen leakage at the connection between the feed pipe 3 and the discharge pipe 4, and ensuring the safety and purification effect of the device.

[0036] Example 2:

[0037] This is the second embodiment of the present invention, which is based on the previous embodiment.

[0038] Specifically, a sealing door 10 is hinged to one side of the processing box 1. A sealing strip 11 is fixed to the inner wall of the sealing door 10. A groove 12 is opened on the inner wall of the processing box 1, and the outer side of the sealing strip 11 fits into the inner wall of the groove 12.

[0039] The sealing strip 11 is designed to fit into the groove 12 on the inner wall of the processing chamber 1. When the sealing door 10 is closed, the sealing strip 11 fills the gap between the sealing door 10 and the processing chamber 1, thus sealing the space, preventing hydrogen leakage, and ensuring the safety and purification effect of the device. The groove 12 is designed to provide an installation position for the sealing strip 11 and enhance the sealing performance between the sealing door 10 and the processing chamber 1.

[0040] Specifically, the bottom of the processing box 1 is provided with two sets of funnels 13, the bottom of the funnels 13 is connected to the discharge pipe 14, and a control valve is provided on the outside of the discharge pipe 14.

[0041] The funnel 13 is designed to collect impurities, liquids or other waste generated during the purification process in the processing tank 1 and guide them to the discharge pipe 14 for easy discharge from the processing tank 1. The opening and closing of the discharge pipe 14 can be controlled by a control valve, so as to conveniently and safely discharge the waste collected in the funnel 13 from the processing tank 1 while avoiding hydrogen leakage.

[0042] Specifically, both sides of the processing box 1 are provided with exhaust ports 15 for discharging heat from the hollow cavity 2, and the inner wall of the exhaust port 15 is equipped with a filter screen. The top of the processing box 1 is connected to an exhaust pipe 16 that penetrates the inner wall of the hollow cavity 2, and a control valve and a flange are respectively provided on the outer side and the top of the exhaust pipe 16.

[0043] The exhaust port 15 is designed to expel heat from the hollow cavity 2, preventing heat buildup inside the hollow cavity 2 and affecting the cooling effect. At the same time, the filter screen installed on the inner wall of the exhaust port 15 can prevent external dust and impurities from entering the hollow cavity 2, ensuring the cleanliness of the hollow cavity 2. The opening and closing of the exhaust pipe 16 can be controlled by the control valve, and hydrogen or other gases in the processing box 1 can be discharged when needed. The flange facilitates connection to external gas collection or processing pipelines.

[0044] Example 3:

[0045] This is the third embodiment of the present invention, which is based on the first two embodiments.

[0046] Specifically, a protective shell 17 is installed on the top of the processing box 1, and a motor 18 is installed inside the protective shell 17.

[0047] The protective housing 17 is provided to provide installation space and protection for the motor 18, prevent the motor 18 from being affected by the external environment, and ensure the normal operation of the motor 18. The motor 18, as a power source, drives the worm gear 19 to rotate by rotating, which in turn drives the worm wheel 20 to rotate, providing power to the components related to the worm wheel 20.

[0048] Specifically, a worm gear 19 is fixed to the output end of the motor 18, and a worm wheel 20 is fixed to the outside of the feed pipe 3, with the inner wall of the worm wheel 20 meshing with the outer side of the worm gear 19.

[0049] The worm gear 19 is connected to the output shaft of the motor 18 and can rotate under the drive of the motor 18. Through the meshing connection with the worm wheel 20, the rotational motion is transmitted to the worm wheel 20, realizing the transmission and conversion of power. The worm wheel 20 rotates under the drive of the worm gear 19, thereby driving the feed pipe 3 to rotate, which in turn drives the discharge pipe 4 to rotate, so that the hydrogen introduced into the processing box 1 by the discharge pipe 4 can be evenly dispersed, thereby improving the hydrogen purification effect.

[0050] Specifically, a limiting frame 21 is fixed at the air inlet of the outer casing 6, and an air vent 22 is provided on the inner wall of the limiting frame 21. A sieve plate 23 is slidably connected to the inner wall of the limiting frame 21, and a pull rod is fixed on one side of the sieve plate 23.

[0051] The limiting frame 21 is set to provide an installation frame and limit the screen plate 23, preventing the screen plate 23 from shifting or falling off during use. The vent 22 serves as a channel for air to enter the outer casing 6, allowing outside air to enter the outer casing 6 through the vent 22, providing the air source required for cooling the refrigerator body 8. The screen plate 23 can filter dust, impurities and other particles in the air entering the outer casing 6, preventing these impurities from entering the interior of the outer casing 6 and affecting the normal operation of the exhaust fan 7 and the refrigerator body 8, while also protecting the cleanliness of the subsequent cooling system. The screen plate 23 can be easily pulled out from the limiting frame 21 for cleaning and replacement by means of a pull rod.

[0052] Working Principle: When using this hydrogen purification device, hydrogen is first introduced through the external pipe connected to the flange at the top of the feed pipe 3. The feed pipe 3 and the discharge pipe 4 are securely connected by the snap-fit ​​assembly 5. The through hole at the bottom of the discharge pipe 4 evenly disperses the hydrogen into the processing chamber 1, allowing it to fully contact the purified substance for purification. At the same time, the cooler body 8 cools the air inside the outer shell 6. The exhaust fan 7 rotates to generate airflow, which causes the cooled gas to enter the hollow cavity 2 through the gas guide pipe 9, cooling the hydrogen in the processing chamber 1 and preventing it from exploding due to excessive temperature. The gas that has absorbed heat returns to the outer shell 6 through the gas guide pipe 9 to form a cooling cycle. Simultaneously, the motor 18 is started, which drives the worm gear 19 to rotate. Since the worm gear 19 meshes with the worm wheel 20, it can drive the feed... The rotation of pipe 3 and discharge pipe 4 allows hydrogen to be more evenly dispersed in the processing chamber 1, thereby improving the hydrogen purification effect. In addition, at the air inlet of the outer shell 6, air enters through the vent 22 of the limiting frame 21 and is filtered by the sieve plate 23 to remove dust and impurities, thus protecting the internal equipment. Impurities and liquids generated during the hydrogen purification process are collected by the funnel 13 and then discharged through the control valve of the discharge pipe 14. Heat in the hollow cavity 2 is discharged through the exhaust port 15. The filter screen prevents dust from entering the hollow cavity 2. If it is necessary to discharge the gas in the processing chamber 1, it can be achieved by controlling the control valve of the exhaust pipe 16. Its top flange can be easily connected to external pipelines. The sealing door 10 and sealing strip 11 ensure the airtightness of the device, prevent hydrogen leakage, and ensure the safe and stable operation of the device.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydrogen gas purification device capable of preventing hydrogen gas from exploding, comprising a treatment tank (1), characterized in that: The inner wall of the processing box (1) is provided with a hollow cavity (2). The top of the processing box (1) is connected to a feed pipe (3) that penetrates the inner wall of the hollow cavity (2). The top of the feed pipe (3) is rotatably connected to a flange. The bottom of the feed pipe (3) is equipped with a discharge pipe (4). The bottom of the discharge pipe (4) has multiple sets of through holes. The connection between the feed pipe (3) and the discharge pipe (4) is provided with a snap-fit ​​assembly (5). The back of the processing box (1) is equipped with a shell (6), and an exhaust fan (7) and a cooler body (8) are installed inside the shell (6). The inner wall of the shell (6) is connected to two sets of air guide pipes (9), and one end of the air guide pipe (9) is connected to the inner wall of the hollow cavity (2). The snap-fit ​​assembly (5) includes a snap-fit ​​ring (51) fixed to the outside of the feed pipe (3). The inner wall of the snap-fit ​​ring (51) is provided with a sliding groove (52). The inner wall of the sliding groove (52) is provided with a snap-fit ​​groove (53). The outside of the discharge pipe (4) is fixed with a buckle (54). The outside of the buckle (54) is slidably connected to the inner wall of the sliding groove (52) and snapped with the inner wall of the snap-fit ​​groove (53). The top of the discharge pipe (4) is fixed with a sealing gasket (55). The outside of the sealing gasket (55) is attached to the bottom of the feed pipe (3).

2. The hydrogen gas purification device capable of preventing hydrogen gas from exploding according to claim 1, characterized by: A sealing door (10) is hinged to one side of the processing box (1). A sealing strip (11) is fixed to the inner wall of the sealing door (10). A groove (12) is opened on the inner wall of the processing box (1), and the outer side of the sealing strip (11) fits into the inner wall of the groove (12).

3. The hydrogen gas purification device capable of preventing hydrogen gas from exploding according to claim 1, characterized by: The bottom of the processing box (1) is provided with two sets of funnels (13), the bottom of the funnels (13) is connected to the discharge pipe (14), and a control valve is provided on the outside of the discharge pipe (14).

4. The hydrogen purification device for preventing hydrogen combustion and explosion as described in claim 1, characterized in that: Both sides of the processing box (1) are provided with exhaust ports (15) for discharging heat from the hollow cavity (2), and the inner wall of the exhaust port (15) is equipped with a filter screen. The top of the processing box (1) is connected to an exhaust pipe (16) that penetrates the inner wall of the hollow cavity (2), and the outer side and top of the exhaust pipe (16) are respectively provided with a control valve and a flange.

5. The hydrogen gas purification device capable of preventing hydrogen gas from exploding according to claim 1, wherein: The top of the processing box (1) is fitted with a protective shell (17), and a motor (18) is installed inside the protective shell (17).

6. The hydrogen gas purification device capable of preventing ignition of hydrogen gas according to claim 5, characterized by: The output end of the motor (18) is fixed with a worm (19), and the outside of the feed pipe (3) is fixed with a worm wheel (20), and the inner wall of the worm wheel (20) is meshed with the outside of the worm (19).

7. The hydrogen gas purification device capable of preventing ignition of hydrogen gas according to claim 1, characterized by: A limiting frame (21) is fixed at the air inlet of the outer shell (6). An air vent (22) is provided on the inner wall of the limiting frame (21). A sieve plate (23) is slidably connected to the inner wall of the limiting frame (21), and a pull rod is fixed on one side of the sieve plate (23).

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