Experimental wet granulation drying and interchanging integrated granulation kettle

Abstract

The application discloses an experimental wet granulation drying interchanging integrated granulation pot, which comprises a pot cover, a pot body, a pot body lifting system, an inner container, a stirring system, a injection system, a granulation system and a drying system. The pot cover and the pot body lifting system are fixedly arranged on a rack. The pot body is drivingly connected with the pot body lifting system and is separably and fixedly connected with the pot cover. The inner container is placed in the pot body and can be simultaneously sealed with the pot cover and the pot body. The stirring system comprises a stirring motor and a stirring shaft. The stirring motor is drivingly connected with the stirring shaft. The stirring shaft penetrates through the pot cover and is rotationally connected with the pot cover. The bottom end of the stirring shaft is fixedly provided with a stirring paddle. The stirring system, the injection system, the granulation system and the drying system are arranged. The powder mixing, humidifying, granulating, drying and interchanging inner container of the pot can be realized. After the granulation, the powder does not need to be transported to the drying equipment for drying. In the granulation process, the powder can be simultaneously dried. The phenomenon of powder caking, wall sticking and knife sticking is effectively relieved.

Description

Technical Field

[0001] This invention relates to the field of pharmaceutical manufacturing technology, specifically to an experimental wet granulation and drying interchangeable granulation pan. Background Technology

[0002] Experimental wet granulation machines are specialized equipment used to mix raw powder, auxiliary powder, and binder into a moist, soft powder, which is then granulated. They are primarily used in laboratories of pharmaceutical, food, and chemical industries for data collection during small-scale process experiments. Current experimental wet granulation machines employ a bottom-drive design, with the granulation pan horizontally fixed to the frame. The pan is clamped to the frame by stirring blades, which are driven from the bottom, causing the material to rotate at high speed within the pan. Granulation is then achieved by the cutting action of high-speed grinding paddles placed on the side of the pan. In actual production, the granulation pans of existing wet granulation machines generally suffer from the following problems:

[0003] 1. It only has the function of stirring and granulation, and its function is limited. Drying requires a separate special equipment for transportation.

[0004] 2. During the granulation process, a binder is added to form the powder into a soft material. During this process, due to the moisture content of the binder or the powder itself, clumping may occur, resulting in sticking to the walls or blades. When cleaning, the entire pot body needs to be disassembled, which is very difficult and troublesome, wasting time and effort. Moreover, multiple disassembly and reassembly will affect the precision of the equipment. Summary of the Invention

[0005] The purpose of this invention is to provide an experimental wet granulation and drying interchangeable granulation pan to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An experimental wet granulation and drying interchangeable granulation pot includes a lid, a pot body, a pot body lifting system, an inner liner, a stirring system, a dispensing system, a granulation system, and a drying system. The lid and the pot body lifting system are fixedly mounted on a frame. The pot body is driven to the pot body lifting system and is detachably and fixedly connected to the lid. The inner liner is placed inside the pot body and can be sealed to both the lid and the pot body. The stirring system includes a stirring motor and a stirring shaft. The stirring motor is driven to the stirring shaft, which passes through the lid and is rotatably connected to it. A stirring paddle is fixedly installed at the bottom of the stirring shaft. The injection system includes a spray gun, which is fixedly installed on the pot lid. The granulation system includes a granulation motor and a granulation cutter shaft. The granulation motor is drivenly connected to the granulation cutter shaft. The granulation cutter shaft passes through the pot lid and is rotatably connected to the pot lid. A granulation cutter is fixedly installed at the bottom of the granulation cutter shaft. The drying system includes a hot water circulation system and a vacuum system. The hot water circulation system is connected to the pot body and is used to heat the inner pot. The vacuum system is installed on the pot lid and is connected to the inner pot. It is used to extract air from the inner pot.

[0008] Furthermore, the pot body includes an outer pot body shell, an inner pot body shell, and a pot body flange. The inner pot body shell is suspended inside the outer pot body shell, and the top surfaces of the outer pot body shell and the inner pot body shell are fixedly connected to and sealed with the pot body flange. A retaining ring is fixedly provided on the top surface of the pot body flange, and the retaining ring has a notch. A first sealing ring is provided on the inner side of the pot body flange.

[0009] Furthermore, the inner liner includes a liner body and an inner liner flange. The inner liner flange is fixedly installed on the top of the liner body, and a stop block is fixedly installed on the outer side wall of the inner liner flange. The bottom surface of the inner liner flange is tightly attached to the top surface of the pot body flange, and the stop block is engaged in a notch. The pot body flange is sealed to the inner liner flange through a first sealing ring. A second sealing ring is provided on the top surface of the inner liner flange. The pot lid covers the top surface of the inner liner flange and is sealed to the inner liner flange through the second sealing ring. The inner liner is available in three sizes: 6L, 9L, and 12L.

[0010] Furthermore, the stirring system also includes a first mounting base, which is fixedly disposed at the center of the pot lid. A first bushing is fixedly disposed on the first mounting base, and a first bearing is coaxially mounted inside the first bushing. The stirring shaft is rotatably connected to the first bushing through the first bearing. A first pulley is fixedly disposed at the top end of the stirring shaft, and the stirring motor is driven by the first pulley through a belt.

[0011] Furthermore, the injection system also includes a third mounting base, which is fixedly mounted on the pot lid, and the spray gun is fixedly connected to the third mounting base with its bottom end extending into the inner liner.

[0012] Furthermore, the granulation system also includes a second mounting base and a screw post. The second mounting base is fixedly mounted on the pot lid, and the screw post is fixedly connected to the pot lid and located on both sides of the second mounting base. A second bushing is placed inside the second mounting base, and a second bearing is eccentrically fixed inside the second bushing. The granulation blade shaft is rotatably connected to the second bushing via the second bearing. A pressure plate is mounted on the second bushing, and the pressure plate is fixedly connected to the screw post via an adjusting screw. A second pulley is fixedly mounted at the top of the granulation blade shaft, and the granulation motor is driven by the second pulley via a transmission belt. An eccentric tensioning mechanism is provided at the transmission belt.

[0013] Furthermore, the eccentric tensioning mechanism includes a fixed shaft, a locking shaft, and a locking stud. The fixed shaft and the locking shaft are fixedly mounted on the frame. The fixed shaft is rotatably connected to an adjusting plate. The adjusting plate has an arc-shaped groove. The locking stud can pass through the arc-shaped groove and be threadedly connected to the locking shaft to fix the adjusting plate on the locking shaft. The adjusting plate is provided with a synchronous pulley, which meshes with a transmission belt.

[0014] Furthermore, the hot water circulation system includes an external heating device, a water inlet, a water outlet, and a pot body jacket formed by the pot body and the inner liner. The water inlet and the water outlet are fixedly connected to the pot body and are both connected to the pot body jacket. The external heating device is connected to the water inlet and the water outlet through flexible hoses.

[0015] Furthermore, the vacuum system includes a vacuum pump, a fourth mounting base, and a breather. The fourth mounting base is fixedly mounted on the pot lid. The breather is fixedly connected to the fourth mounting base and communicates with the inner pot. The vacuum pump is connected to the breather. The pot lid is equipped with a pressure sensor for detecting the pressure of the inner pot.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention is equipped with a stirring system, a dispensing system, a granulation system and a drying system, which can realize the multi-process integration of powder mixing, humidification, granulation, drying and interchange of pot inner liner. After granulation, there is no need to transfer it to the drying equipment for drying. The powder can be dried at the same time during the granulation process, which can effectively alleviate the phenomena of powder clumping, sticking to the wall and sticking to the blade, and the granulation is more uniform.

[0018] 2. The inner pot is available in three sizes: 6L, 9L, and 12L. All are individual movable parts, allowing for quick and easy installation and removal. Cleaning does not require disassembling the entire pot; simply remove the inner pot for cleaning. The inner pot cleaning process is fast and simple, saving significant cleaning time and ensuring that the equipment's accuracy is not affected by pot disassembly. Furthermore, different sized inner pots can be interchanged, allowing for cleaning of the used inner pot while granulation, thus improving production efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of the structure of the present invention (view 1).

[0020] Figure 2 This is a three-dimensional view of the structure of the present invention (view 2);

[0021] Figure 3 This is a cross-sectional view of the structure of the present invention;

[0022] Figure 4 This is a top view of the present invention;

[0023] Figure 5 for Figure 3 Sectional view of AA;

[0024] Figure 6 for Figure 4 BB section view;

[0025] Figure 7 This is a schematic diagram of an eccentric tensioning mechanism;

[0026] Figure 8 A 3D view of the pot body;

[0027] Figure 9 This is a sectional view of the pot body;

[0028] Figure 10 A 3D view of the inner lining;

[0029] Figure 11 This is a cross-sectional view of the inner lining;

[0030] In the diagram: 1-Pot lid, 2-Pot body, 201-Pot body outer shell, 202-Pot body inner shell, 203-Pot body flange, 204-Retaining ring, 205-Notch, 206-First sealing ring, 207-Water inlet, 208-Water outlet, 209-Pot body jacket, 3-Inner liner, 301-liner body, 302-Inner liner flange, 303-Stop block, 304-Second sealing ring, 4-Pot body lifting system, 5-Stirring system, 501-Stirring shaft, 502-Stirring paddle, 503-First mounting base, 504-First bushing, 505-First bearing, 506-First pulley, 6-Pelletizing system, 601- 602-Pelletizing knife shaft, 603-Second mounting base, 604-Second bushing, 605-Second bearing, 606-Pressure plate, 607-Screw hole stud, 608-Adjusting screw, 609-Second pulley, 610-Drive belt, 7-Eccentric tensioning mechanism, 701-Fixed shaft, 702-Locking shaft, 703-Locking stud, 704-Adjusting plate, 705-Arc groove, 706-Synchronous pulley, 8-Injection system, 801-Spray gun, 802-Third mounting base, 9-Vacuum system, 901-Fourth mounting base, 902-Breatheer, 903-Pressure sensor, 10-Clamp. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] Please see Figures 1-11 One embodiment provided by this utility model:

[0033] An experimental wet granulation and drying interchangeable granulation pot includes a lid 1, a pot body 2, a pot body lifting system 4, an inner liner 3, a stirring system 5, a dispensing system 8, a granulation system 6, and a drying system. The lid 1 and the pot body lifting system 4 are fixedly mounted on a frame (not shown in the figure). The pot body 2 is drivenly connected to the pot body lifting system 4 and can be detachably and fixedly connected to the lid 1 via a clamp 10. The inner liner 3 is placed inside the pot body 2 and can be sealed to both the lid 1 and the pot body 2. The stirring system 5 includes a stirring motor and a stirring shaft 501. The stirring motor is drivenly connected to the stirring shaft 501. The stirring shaft 501 passes through the lid 1 and is rotatably connected to the lid 1. A stirring paddle 502 is fixedly mounted at the bottom end of the stirring shaft 501 for stirring the powder. The mixing and stirring system 8 includes a spray gun 801, which is fixedly installed on the pot lid 1 and used to inject binder into the powder. The granulation system 6 includes a granulation motor and a granulation blade shaft 601. The granulation motor is connected to the granulation blade shaft 601. The granulation blade shaft 601 passes through the pot lid 1 and is rotatably connected to the pot lid 1. A granulation blade 602 is fixedly installed at the bottom end of the granulation blade shaft 601 and used to cut the soft powder into granules. The drying system includes a hot water circulation system and a vacuum system 9. The hot water circulation system is connected to the pot body 2 and is used to heat the inner pot 3. The vacuum system 9 is set on the pot lid 1 and is connected to the inner pot 3 and is used to extract air from the inner pot 3 to achieve the function of vacuum drying of the powder in the inner pot 3.

[0034] The pot body 2 includes a pot body outer shell 201, a pot body inner shell 202, and a pot body flange 203. The pot body inner shell 202 is suspended inside the pot body outer shell 201, and the top surfaces of the pot body outer shell 201 and the pot body inner shell 202 are fully welded to the pot body flange 203 to ensure sealing. A retaining ring 204 is fixedly installed on the top surface of the pot body flange 203. The retaining ring 204 is processed based on the pot body flange 203. The retaining ring 204 has a notch 205. A sealing ring groove is opened on the inner side of the pot body flange 203 and a first sealing ring 206 is installed.

[0035] The inner liner 3 includes a liner body 301 and an inner liner flange 302. The inner liner flange 302 is fixedly welded to the top of the liner body 301. A stop block 303 is welded to the outer wall of the inner liner flange 302. The bottom surface of the inner liner flange 302 is close to the top surface of the pot body flange 203, and the stop block 303 is locked in the notch 205 to prevent the inner liner 3 from rotating. The pot body flange 203 is sealed to the inner liner flange 302 by a first sealing ring 206. A sealing ring groove is opened on the top surface of the inner liner flange 302 and a second sealing ring 304 is installed. The pot lid 1 covers the top surface of the inner liner flange 302 and is sealed to the inner liner flange 302 by the second sealing ring 304. The inner liner 3 is available in three sizes: 6L, 9L, and 12L.

[0036] The stirring system 5 also includes a first mounting base 503, which is fixedly welded to the center of the pot lid 1. A first bushing 504 is fixedly connected to the first mounting base 503 by screws. A first bearing 505 is coaxially installed inside the first bushing 504. The stirring shaft 501 is rotatably connected to the first bushing 504 through the first bearing 505. A first pulley 506 is fixedly installed at the top of the stirring shaft 501. The stirring motor is driven by the first pulley 506 through a belt, thereby driving the stirring shaft 501 and the stirring paddle 502 to rotate.

[0037] The injection system 8 also includes a third mounting base 802, which is fixedly welded to the pot lid 1. The spray gun 801 is fixedly connected to the third mounting base 802 through a quick-connect coupling and its bottom end extends into the inner liner 3.

[0038] The granulation system 6 also includes a second mounting base 603 and a screw post 607. The second mounting base 603 is fixedly welded to the pot lid 1. The screw post 607 is welded to the pot lid 1 and located on both sides of the second mounting base 603. A second bushing 604 is placed inside the second mounting base 603. A second bearing 605 is eccentrically fixed inside the second bushing 604. The granulation knife shaft 601 is rotatably connected to the second bushing 604 through the second bearing 605. A pressure plate 606 is provided on the second bushing 604. The pressure plate 606 is fixedly connected to the screw post 607 through an adjusting screw 608. A second pulley 609 is fixedly installed at the top of the granulation knife shaft 601. The granulation motor is driven by the second pulley 609 through a transmission belt 610, thereby driving the granulation knife shaft 601 and the granulation knife 602 to rotate. An eccentric tensioning mechanism 7 is provided at the transmission belt 610.

[0039] The eccentric tensioning mechanism 7 includes a fixed shaft 701, a locking shaft 702, and a locking stud 703. The fixed shaft 701 and the locking shaft 702 are fixedly installed on the frame. The fixed shaft 701 is rotatably connected to an adjusting plate 704. The adjusting plate 704 has an arc-shaped groove 705. The locking stud 703 can pass through the arc-shaped groove 705 and be threadedly connected to the locking shaft 702, thus fixing the adjusting plate 704 to the locking shaft 702. The adjusting plate 704 is equipped with a synchronous pulley 706, which meshes with the transmission belt 610. When changing to a different specification of inner liner 3, the position of the granulator shaft 601 needs to be adjusted. First, loosen the locking stud 703 to slack the drive belt 610. Then, loosen the adjusting screw 608 and remove the pressure plate 606. Rotate the second bushing 604. Since the second bushing 604 is eccentrically set, the position of the granulator shaft 601 changes. When the position of the granulator shaft 601 is adjusted to the appropriate position, use the adjusting screw 608 to press the pressure plate 606 to fix the second bushing 604 so that it cannot be rotated. Then, rotate the adjusting plate 704 to press the synchronous pulley 706 and engage the drive belt 610. Finally, tighten the locking stud 703 to fix the adjusting plate 704 and keep the drive belt 610 taut at all times.

[0040] The hot water circulation system includes an external heating device, a water inlet 207, a water outlet 208, and a pot body jacket 209 formed by the pot body 2 and the inner liner 3. The water inlet 207 and the water outlet 208 are welded to the pot body 2 and are both connected to the pot body jacket 209. The external heating device is connected to the water inlet 207 and the water outlet 208 through flexible hoses.

[0041] The vacuum system 9 includes a vacuum pump, a fourth mounting base 901, and a breather 902. The fourth mounting base 901 is fixedly welded to the pot lid 1. The breather 902 is fixedly connected to the fourth mounting base 901 through a quick-connect coupling and communicates with the inner pot 3. The vacuum pump is connected to the breather 902. The pot lid 1 is equipped with a pressure sensor 903 for detecting the pressure of the inner pot 3.

[0042] Working principle of this invention: In use, loosen the clamp 10 and return the pot body lifting system 4 to its original position. The pot body lifting system 4 will cause the pot body 2 to separate from the pot lid 1. Select an inner liner 3 of appropriate size as needed and place it in the pot body 2. Adjust the position of the granulator blade shaft 601, add powder into the pot body 2, start the pot body lifting system 4, and the pot body 2 will rise and fasten to the pot lid 1. Install the clamp 10 to further fix and seal the pot lid 1 and pot body 2. Start the stirring motor, and the stirring paddle 502 will mix the powder at high speed. Inject the adhesive through the spray gun 801, and start the granulator motor to make the granulator blade... 602 high-speed rotation cuts the soft powder to complete granulation. The external heating device is turned on, and hot water circulates through the external heating device, water inlet 207, pot body jacket 209, water outlet 208, and external heating device to heat the inner pot 3. At the same time, the vacuum pump is started to draw a vacuum into the inner pot 3 to vacuum dry the powder particles inside the inner pot 3. After completion, the external heating device is stopped, the circulating water in the pot body jacket 209 is drained, the vacuum pump is stopped, the pot body lifting system 4 is started and returned to its original position, the pot body 2 is separated from the pot lid 1, the powder particles are taken out, and after cooling, the inner pot 3 is taken out and cleaned.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An experimental wet granulation drying and interchange integrated granulation kettle, characterized in that: The utility model provides a multi -functional steam cooking pot, including the pot cover (1), the pot body (2), the pot body lifting system (4), the inner container (3), the stirring system (5), the injection system (8), the granulating system (6) and dry system, the pot cover (1) and the pot body lifting system (4) fixed setting is in the frame, the pot body (2) with pot body lifting system (4) drive connection and with pot cover (1) separable fixed connection, the inner container (3) places in the pot body (2) and can be sealed with pot cover (1), the pot body (2) simultaneously, the stirring system (5) includes stirring motor and stirring shaft (501), the stirring motor with stirring shaft (501) transmission is connected, the stirring shaft (501) passes through the pot cover (1) and is rotatably connected with the pot cover (1), the stirring shaft (501) bottom fixedly set up with stirring paddle (502), the injection system (8) includes the spray gun (801), the spray gun (801) fixed setting is on the pot cover (1), the granulating system (6) includes granulating motor and granulating cutter shaft (601), the granulating motor with granulating cutter shaft (601) transmission is connected, the granulating cutter shaft (601) passes through the pot cover (1) and is rotatably connected with the pot cover (1), the granulating cutter shaft (601) bottom fixedly set up with granulating cutter (602), the dry system includes hot water circulation system and vacuum system (9), the hot water circulation system is connected with the pot body (2), for heating the temperature of inner container (3), the vacuum system (9) is set up on the pot cover (1) and is communicated with inner container (3), for extracting the air in inner container (3); The pot body (2) includes a pot body shell (201), a pot body inner shell (202), and a pot body flange (203). The pot body inner shell (202) is suspended inside the pot body shell (201), and the top surfaces of the pot body shell (201) and the pot body inner shell (202) are fixedly connected and sealed with the pot body flange (203). The top surface of the pot body flange (203) is fixedly provided with a retaining ring (204), and the retaining ring (204) is provided with a notch (205). The inner side of the pot body flange (203) is provided with a first sealing ring (206). The inner container (3) includes a container body (301) and an inner container flange (302). The inner container flange (302) is fixedly arranged on the top of the container body (301). The outer side wall of the inner container flange (302) is fixedly provided with a retaining block (303). The bottom surface of the inner container flange (302) is tightly attached to the top surface of the pot body flange (203), and the retaining block (303) is clamped in the notch (205). The pot body flange (203) is sealed with the inner container flange (302) through the first sealing ring (206). The top surface of the inner container flange (302) is provided with a second sealing ring (304). The pot cover (1) covers the top surface of the inner container flange (302) and is sealed with the inner container flange (302) through the second sealing ring (304). The inner container (3) is provided with three specifications of 6L, 9L, and 12L. The pelletizing system (6) further comprises a second mounting seat (603) and a threaded hole column (607), the second mounting seat (603) is fixedly arranged on the pot cover (1), the threaded hole column (607) is fixedly connected with the pot cover (1) and located on both sides of the second mounting seat (603), a second shaft sleeve (604) is placed in the second mounting seat (603), a second bearing (605) is eccentrically fixedly arranged in the second shaft sleeve (604), the pelletizing cutter shaft (601) is rotatably connected with the second shaft sleeve (604) through the second bearing (605), a pressing plate (606) is arranged on the second shaft sleeve (604), the pressing plate (606) is fixedly connected with the threaded hole column (607) through an adjusting screw rod (608), a second belt pulley (609) is fixedly arranged at the top end of the pelletizing cutter shaft (601), and a pelletizing motor is drivingly connected with the second belt pulley (609) through a transmission belt (610); an eccentric tensioning mechanism (7) is arranged at the transmission belt (610); The eccentric tensioning mechanism (7) comprises a fixed shaft (701), a locking shaft (702) and a locking stud (703), the fixed shaft (701) and the locking shaft (702) are fixedly arranged on a rack, the fixed shaft (701) is rotatably connected with an adjusting plate (704), the adjusting plate (704) is provided with an arc-shaped slot (705), the locking stud (703) is threadedly connected with the locking shaft (702) through the arc-shaped slot (705) and fixes the adjusting plate (704) on the locking shaft (702), and the adjusting plate (704) is provided with a synchronous belt pulley (706); the synchronous belt pulley (706) is engaged with the transmission belt (610); When the position of the pelletizing cutter shaft (601) needs to be adjusted for replacing the inner container (3) of different specifications, first, the locking stud (703) is loosened to make the transmission belt (610) in a slack state, then the adjusting screw rod (608) is loosened and the pressing plate (606) is removed, the second shaft sleeve (604) is rotated, the position of the pelletizing cutter shaft (601) is changed due to the eccentric arrangement of the second shaft sleeve (604), when the position of the pelletizing cutter shaft (601) is adjusted to a proper position, the pressing plate (606) is pressed by the adjusting screw rod (608) to fix the second shaft sleeve (604) and make it not rotatable, then the adjusting plate (704) is rotated to press and engage the synchronous belt pulley (706) with the transmission belt (610), and finally the locking stud (703) is tightened to fix the adjusting plate (704) and make the transmission belt (610) always in a tensioned state.

2. The experimental wet granulation and drying interchangeable integrated granulator kettle according to claim 1, characterized in that: The stirring system (5) further comprises a first mounting base (503) fixedly arranged at a central position of the pot cover (1), a first shaft sleeve (504) fixedly arranged on the first mounting base (503), a first bearing (505) coaxially arranged in the first shaft sleeve (504), and a stirring shaft (501) rotatably connected with the first bearing (505) and the first shaft sleeve (504).

3. The experimental wet granulation and drying interchangeable integrated granulator kettle according to claim 1, characterized in that: The injection system (8) further comprises a third mounting base (802) fixedly arranged on the pot cover (1), and the spray gun (801) is fixedly connected with the third mounting base (802) and extends into the inner container (3) at a bottom end.

4. The experimental wet granulation and drying interchangeable integrated granulator kettle according to claim 1, characterized in that: The hot water circulating system comprises an external heating device, a water injection port (207), a water outlet (208), and a pot body jacket (209) formed by the pot body (2) and the inner container (3), the water injection port (207) and the water outlet (208) are fixedly connected with the pot body (2) and are in communication with the pot body jacket (209), and the external heating device is connected with the water injection port (207) and the water outlet (208) through a hose.

5. The experimental wet granulation and drying interchangeable integrated granulator kettle according to claim 1, characterized in that: The vacuumizing system (9) comprises a vacuum pump, a fourth mounting base (901) and a breather (902), the fourth mounting base (901) is fixedly arranged on the pot cover (1), the breather (902) is fixedly connected with the fourth mounting base (901) and is in communication with the inner container (3), the vacuum pump is connected with the breather (902), and the pot cover (1) is provided with a pressure sensor (903) for detecting the pressure of the inner container (3).

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