Efficient mixing hopper structure

Abstract

The utility model relates to the technical field of material mixing, and discloses an efficient mixing hopper structure which comprises a hopper main body, a hopper cover and a connecting rod, the hopper main body is provided with a feed port, and the hopper cover covers the feed port. The connecting rod is fixed to the hopper body, the axis of the connecting rod is perpendicular to the axis of the hopper body, the connecting rod is used for driving the hopper body to rotate around the axis of the connecting rod, and at least two flow guide plates used for guiding solid materials are arranged on the side, facing the hopper body, of the hopper cover. The length directions of all the flow guide plates are the same, and the flow guide plates are arranged on the hopper cover at intervals. According to the utility model, the guide plate for guiding the solid material is arranged on the hopper cover, and the guide plate can scatter and distribute the solid material falling onto the guide plate in the rotating process of the hopper structure, so that the mixing efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of material mixing technology, and in particular to a hopper structure for efficient mixing. Background Technology

[0002] Hopper mixers are commonly used mechanical equipment in industries such as pharmaceuticals and food. They mix various solid materials by loading them into the same hopper and causing the hopper to swing, rotate, or vibrate.

[0003] For pharmaceuticals made from a mixture of two or more solid powders, there are strict requirements for the final degree of mixing of each component powder. However, existing hopper mixing structures generally have a low degree of mixing of solid powders. To meet the mixing standards for pharmaceuticals, the mixing time can only be extended, resulting in a single batch mixing time exceeding two hours. This not only severely reduces the production efficiency of pharmaceuticals, but the continuously operating hopper mixing structure also leads to energy consumption, which is detrimental to controlling the production cost of pharmaceuticals. Utility Model Content

[0004] To address the problems existing in the prior art, namely the low mixing efficiency and excessively long mixing time of the existing hopper mixing structure, the purpose of this utility model is to provide a high-efficiency mixing hopper structure. By setting a guide plate on the hopper cover for guiding the flow of solid materials, the guide plate can disperse and divert the solid materials falling onto the guide plate during the rotation of the hopper structure, thereby greatly improving the mixing efficiency.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A high-efficiency mixing hopper structure includes a hopper body and a hopper cover. The hopper body has a feed inlet, and the hopper cover is placed over the feed inlet. It also includes a connecting rod, which is fixed to the hopper body and its axis is perpendicular to the axis of the hopper body. The connecting rod is used to drive the hopper body to rotate around the axis of the connecting rod. The hopper cover has at least two guide plates for guiding solid materials on the side facing the hopper body. All the guide plates have the same length direction and are spaced apart on the hopper cover.

[0007] The present invention is further configured such that, in the arrangement direction of the guide plate, the diameter of the hopper cover is divided into several segments by the guide plate.

[0008] The present invention is further configured such that: there are two guide plates, and when the connecting rod rotates clockwise, the angle between the center line of the two guide plates on the hopper cover and the axis of the connecting rod is 10° to 80°; when the connecting rod rotates counterclockwise, the angle between the center line of the two guide plates on the hopper cover and the axis of the connecting rod is 100° to 170°.

[0009] The present invention is further configured such that: the cross-sectional shape of the guide plate in the direction perpendicular to its own height is arc-shaped, and the bending directions of the two guide plates are opposite to each other; the value range of the bending arc of the guide plate is 0.05π to 0.5π.

[0010] The present invention is further configured such that the cross-sectional shape of the guide plate in the direction perpendicular to its own height is wavy, and the bending direction at each position on the two guide plates is consistent.

[0011] The present invention is further configured such that: the guide plate includes a first guide section, a second guide section and a third guide section, and the length ratio of the first guide section, the second guide section and the third guide section is 1:4:1; the included angle between the first guide section and the second guide section and the included angle between the second guide section and the third guide section are both within the range of 100° to 170°.

[0012] The present invention is further configured such that: the guide plate is provided with guide holes for solid materials to pass through.

[0013] The present invention is further configured such that: the guide hole is located at the middle position along the length of the guide plate, and the area of ​​the guide hole is 20% to 25% of the area of ​​the guide plate.

[0014] The present invention is further configured such that: a jacket is provided on the hopper body, and the jacket is used to introduce a heat-conducting medium.

[0015] The present invention is further configured to include a plug, wherein the hopper cover is provided with a cleaning port and a vent, through which cleaning water can be introduced into the hopper body and through the vent, clean gas can be introduced into the hopper body, and the plug can be fixed to the cleaning port and / or the vent.

[0016] In summary, the beneficial effects achieved by this utility model are as follows:

[0017] (1) The hopper cover is provided with a guide plate for guiding the solid material, and the guide plate is provided with guide holes. Since the hopper body rotates around the axis of the connecting rod, and the position and posture of the hopper cover relative to the hopper body are fixed, the solid material continuously tumbles and falls inside the hopper structure during the rotation of the hopper structure. During this process, the guide plate and guide holes, which are inclined relative to the tumbling direction of the hopper structure, can disperse and divert the solid material falling onto the guide plate, thereby greatly improving the mixing efficiency;

[0018] (2) The guide plate is arc-shaped or wave-shaped, which can increase the contact area and contact time between the guide plate and the solid material, further improving the dispersing effect of the guide plate on the solid material; and the guide hole is located in the middle of the guide plate, which allows the solid material moving along one side of the guide plate to fall down by itself or be squeezed into the space on the other side of the guide plate at the guide hole, further improving the diversion effect of the solid material, and accelerating the mixing of the material during the continuous rotation of the hopper structure;

[0019] (3) By opening a cleaning port and a vent on the hopper cover, and connecting the cleaning port and the vent to a cleaning water pipe or a clean gas pipe respectively, the hopper structure can be cleaned and dried before and after mixing solid materials, ensuring its internal cleanliness; at the same time, the jacket on the hopper body can be used to sterilize the hopper structure by heating, ensuring aseptic mixing of solid medicines. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the composition of the high-efficiency mixing hopper structure in Embodiment 1 of this utility model;

[0022] Figure 2 This is a schematic diagram showing the connection position between the high-efficiency mixing hopper structure and the external structure in Embodiment 1 of this utility model;

[0023] Figure 3 The image shows a bottom view of the hopper cover and guide plate in Embodiment 1 of this utility model. Figure 1 ;

[0024] Figure 4 This is a schematic diagram showing the positional relationship between the hopper cover and the guide plate.

[0025] Figure 5 This is a schematic diagram of the structure of the hopper cover and the guide plate in Embodiment 1 of this utility model;

[0026] Figure 6 The image shows a bottom view of the hopper cover and guide plate in Embodiment 1 of this utility model. Figure 2 ;

[0027] Figure 7 This is a schematic diagram showing the installation posture of the hopper cover relative to the hopper body in Embodiment 1 of this utility model;

[0028] Figure 8 This is a schematic diagram showing the sample collection position inside the hopper body in Embodiment 1 of this utility model;

[0029] Figure 9 This is a bottom view of the hopper cover and guide plate in Embodiment 2 of this utility model;

[0030] Figure 10 This is a bottom view of the guide vane in Embodiment 2 of this utility model;

[0031] Figure 11 This is a schematic diagram of the installation posture of the hopper cover relative to the hopper body in Embodiment 2 of this utility model.

[0032] In the diagram: 1. Hopper body; 11. Discharge port; 12. Jacket; 13. Inlet; 2. Connecting rod; 3. Sealing ring; 4. Hopper cover; 41. Cleaning port; 42. Vent; 43. Guide plate; 431. Guide hole; 43-a. First guide section; 43-b. Second guide section; 43-c. Third guide section; 5. Hinge shaft; 6. Cleaning water pipe; 7. Plug; 8. Fixing component. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. For ease of explanation, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom", etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] It should be noted that the embodiments and features involved in the embodiments of this utility model can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0035] Example 1

[0036] As attached Figure 1-2 As shown, a high-efficiency mixing hopper structure includes a hopper body 1, a hopper cover 4, a connecting rod 2, and external structures such as a plug 7 and a cleaning water pipe 6.

[0037] The upper part of the hopper body 1 is cylindrical, and the lower part is conical, with the axes of the upper and lower parts coinciding. The top of the hopper body 1 is provided with a feed inlet 13, and the bottom is provided with a discharge outlet 11. Solid materials to be mixed are fed into the hopper body 1 through the feed inlet 13. After being fully mixed, the mixed solid materials are discharged through the discharge outlet 11.

[0038] A jacket 12 is provided on the hopper body 1, which is a cavity structure between the inner wall and the outer shell of the hopper body 1. The jacket 12 can be connected to an external pipeline via a valve (the valve and pipeline are not shown in the figure), through which a heat-conducting medium can be introduced into the jacket 12. The heat-conducting medium can be a refrigerant or a heat-conducting medium, thereby heating or cooling the hopper body 1 through the jacket 12. In this embodiment, to maintain a sterile environment inside the hopper body 1, high-temperature steam can be introduced into the jacket 12 to heat and sterilize the hopper body 1.

[0039] Specifically, for ease of manufacturing, the jacket 12 exists only in the upper part of the hopper body 1 without affecting the sterilization effect.

[0040] The connecting rod 2 is horizontally positioned, with one end fixedly connected to the hopper body 1 and the other end connected to the rotating main unit, thereby transmitting power to the hopper body 1. The horizontal axis of the connecting rod 2 is perpendicular to the vertical axis of the hopper body 1. The connecting rod 2 can drive the hopper body 1 to rotate continuously around the axis of the connecting rod 2 by flipping up and down. To improve the connection strength between the connecting rod 2 and the hopper body 1, the connecting rod 2 can extend into the jacket 12, so that the connecting rod 2 can be welded and fixed to both the inner wall and the outer shell of the hopper body 1.

[0041] The hopper cover 4 is a circular sealing cover located on the top of the hopper body 1. The hopper cover 4 covers the feed inlet 13 to seal the feed inlet 13. To improve the sealing performance between the hopper cover 4 and the hopper body 1, a sealing ring 3 is usually provided between the hopper cover 4 and the hopper body 1.

[0042] To facilitate opening and closing, one end of the hopper cover 4 is hinged to the top of the hopper body 1 via a hinge shaft 5. In actual use, after the hopper cover 4 is closed, it is necessary to use other quick-release screws or fixing bolts to firmly fix the hopper cover 4 to the feed inlet 13 to prevent leakage during the mixing process.

[0043] The hopper cover 4 has two cleaning ports 41 and one vent 42. The vent 42 is located at the center of the hopper cover 4, and the two cleaning ports 41 are located on either side of the vent 42. Cleaning water can be introduced into the hopper body 1 through the cleaning ports 41, and clean and dry gas can be introduced into the hopper body 1 through the vent 42.

[0044] Each cleaning port 41 or vent 42 is equipped with a corresponding plug 7 to seal the opening. The size of the plug 7 is adapted to the cleaning port 41 and vent 42. When mixing materials is required, the three plugs 7 are respectively placed on two cleaning ports 41 and one vent 42, and each plug 7 is firmly fixed to the corresponding opening by a fastener 8, thereby maintaining the seal of the hopper body 1. The fastener 8 can be a clamp.

[0045] When cleaning the hopper body 1 is required, remove the plug 7 on the cleaning port 41, align the external cleaning water pipe 6 with the cleaning port 41, and use the fastener 8 to connect and fix the cleaning port 41 to the cleaning water pipe 6. Clean water flows into the hopper body 1 through the cleaning port 41 to clean the inner wall of the hopper body 1. When drying the hopper body 1 is required, remove the plug 7 on the cleaning port 41, align the external clean gas pipe with the vent 42, and use the fastener 8 to connect and fix the vent 42 to the clean gas pipe. Clean gas enters the hopper body 1 through the vent 42 to dry the interior of the hopper body 1. In practical applications, after connecting the cleaning port 41 to the cleaning water pipe 6 and the vent to the clean gas pipe, the controller can control the valves on the pipes to automatically clean, dry, and sterilize the hopper structure according to a set program.

[0046] To improve the mixing speed of materials in the hopper body 1, a guide plate 43 for guiding solid materials is provided on the side of the hopper cover 4 facing the hopper body 1.

[0047] As attached Figure 3-5 As shown, in this embodiment, two guide plates 43 are provided on the hopper cover 4. When the volume of the hopper body 1 increases and the area of ​​the hopper cover 4 increases, three, four, or more guide plates 43 can be provided on the hopper cover 4. The length direction of all guide plates 43 on the same hopper cover 4 (i.e., attached) Figure 4 The L direction is the same, and all the guide plates 43 are arranged at intervals on the hopper cover 4.

[0048] In this embodiment, the guide plate 43 is an arc-shaped plate structure, that is, the guide plate 43 is perpendicular to its own height direction (the height direction of the guide plate 43 is the attached direction). Figure 4The cross-sectional shape in the H direction is arc-shaped. To fully utilize the effect of the guide plate 43, the curvature of the arc-shaped guide plate 43 ranges from 0.05π to 0.5π. For example, in this embodiment, the actual curvature of the arc-shaped guide plate 43 is 0.5π. Furthermore, the bending directions of the two guide plates 43 are set opposite to each other.

[0049] With attachment Figure 3 For example, in all the arrangement directions of the guide plates 43 (i.e., perpendicular to the length direction of the two guide plates 43), the diameter of the hopper cover 4 is divided into 3 equal segments by the two guide plates 43. When there are 3 guide plates 43 on the hopper cover 4, the diameter of the hopper cover 4 is divided into 4 equal segments by the 3 guide plates 43, and so on.

[0050] Each guide plate 43 has a guide hole 431 for solid material to pass through. The guide hole 431 is located at the middle position along the length of the guide plate 43 and is set close to the hopper cover 4. To ensure that an appropriate amount of solid material passes through the guide hole 431 during operation, the area of ​​the guide hole 431 is 20% to 25% of the area of ​​the guide plate 43. When the area of ​​the guide plate 43 is increased, multiple guide holes 431 can be opened at the middle position on the same guide plate 43 as needed.

[0051] It should be noted that the distribution position of the guide plate 43 on the hopper cover 4 is not affected by the cleaning port 41 or the vent 42, as shown in the attached diagram. Figure 6 As shown, it is acceptable as long as the guide plate 43 does not block the cleaning port 41 or the vent 42.

[0052] As attached Figure 2 and attached Figure 7 As shown, since one end of the hopper cover 4 is hinged and fixed to the hopper body 1, the installation posture of the hopper cover 4 relative to the hopper body 1 is fixed, and the hopper cover 4 cannot rotate around its own axis.

[0053] In the appendix Figure 7In the indicated state, the axis of the connecting rod 2 remains horizontal throughout its rotation. When the connecting rod 2 rotates clockwise, the angle α between the centerline of the two guide plates 43 distributed on the hopper cover 4 and the axis of the connecting rod 2 (i.e., the horizontal line) is 10° to 80°. Similarly, when the connecting rod 2 rotates counterclockwise, the angle between the centerline of the two guide plates 43 distributed on the hopper cover 4 and the axis of the connecting rod 2 is 100° to 170°. The centerline of the two guide plates 43 distributed on the hopper cover 4 is also the centerline of the distance between the two guide plates 43 in the direction perpendicular to the length of the guide plates 43. In this embodiment, the two guide plates 43 are also symmetrical about this centerline. This arrangement allows the guide plates 43 and the guide holes 431, which are inclined relative to the hopper structure's rotation direction, to disperse and divert the solid material falling onto the guide plates 43 during the hopper structure's rotation operation, thereby improving the mixing effect of the solid material.

[0054] In this embodiment, the included angle α is further taken to be 40° to 65°, for example 50°, at which point a good mixing effect can be achieved.

[0055] In the actual mixing process, the loading coefficient of solid material in the hopper body 1 is generally 0.3 to 0.8 (that is, the total volume of solid material in the hopper structure is 30% to 80% of the hopper structure capacity); the rotation speed of the connecting rod 2 is 5-30 RPM, preferably 15 RPM (RPM refers to revolutions per minute, that is, the connecting rod 2 rotates 15 times per minute). Under these conditions, the mixing time of solid material in the hopper body 1 is usually 20 to 40 minutes to achieve the required degree of mixing.

[0056] The working process of the above embodiments is illustrated below:

[0057] With the connecting rod 2 stopped and the hopper cover 4 closed, release the fixing parts 8 and plugs 7 on the cleaning port 41 and the vent 42, and then connect the cleaning water pipe 6 and the clean gas pipe to the two cleaning ports 41 and the vent 42 and secure them with the fixing parts 8. The controller automatically performs cleaning according to the set program, and after cleaning, uses dry clean compressed air to automatically blow and dry the hopper structure through the vent 42. Finally, high-temperature steam enters the jacket 12 and performs sterilization and subsequent cooling according to the set program.

[0058] After the ambient temperature, humidity, and cleanliness meet the conditions for aseptic production, anhydrous sodium carbonate and sodium chloride, simulating solid materials, are added at a ratio of 1:5. The mixture is then stirred at 15 rpm for 30 minutes under the following parameters: a loading coefficient of 0.6, clockwise rotation of the hopper structure, and an angle α of 60° between the centerline of the two guide plates 43 on the hopper cover 4 and the axis (horizontal line) of the connecting rod 2. During the rotation of the hopper structure, the anhydrous sodium carbonate and sodium chloride continuously tumble and fall inside the hopper. The mixture falling onto the guide plates 43 slides along their arc. After sliding to the guide hole 431, a portion of the mixture is forced through the guide hole 431 to the other side of the guide plate 43, and this process is repeated continuously, thus constantly dispersing and diverting the mixture, improving the mixing effect.

[0059] As attached Figure 8 As shown, at two time points, 7 samples (3 from the top, 3 from the middle, and 1 from the bottom) were taken from the upper, middle, and lower parts of the hopper body 1 at 10 min and 30 min respectively. Each sample weighed 7.5 g, and the content of anhydrous sodium carbonate was determined. The determination method for anhydrous sodium carbonate was based on the titration method under the "Determination of Content" section of the 2020 edition of the Chinese Pharmacopoeia, Part II. After the determination, the content of anhydrous sodium carbonate and its RSD (relative standard deviation, also known as coefficient of variation) for each test group were calculated.

[0060] The actual testing method is as follows:

[0061] Accurately weigh approximately 7.5g of this product (equivalent to 1.5g of anhydrous sodium carbonate), dissolve it in 50ml of water, add 10 drops of methyl red-bromocresol green mixed indicator solution, and titrate with hydrochloric acid titrant (1.0mol / L) until the solution changes from green to purple-red. Boil for 2 minutes, cool to room temperature, and continue titrating until the solution changes from green to dark purple. Correct the titration result with a blank test. The acceptable standard for homogeneous mixing is: RSD of anhydrous sodium carbonate content ≤ 5%.

[0062] The test results are shown in the table below:

[0063]

[0064]

[0065] The results showed that after only 30 minutes of mixing, the RSD value of the anhydrous sodium carbonate content was greater than 1.02% and less than 5%, meeting the qualified standard. Compared with the existing hopper structure that requires 2 hours of mixing to reach the qualified standard, the guide plate 43 and guide hole 431 in this invention can significantly improve the mixing efficiency of solid materials.

[0066] Example 2

[0067] As attached Figure 9-11 As shown, this utility model discloses a high-efficiency mixing hopper structure. Unlike Embodiment 1, the cross-sectional shape of the guide plate 43 in the direction perpendicular to its own height is wavy.

[0068] The wave-shaped guide vane 43 includes a first guide section 43-a, a second guide section 43-b, and a third guide section 43-c, and the length ratio of the first guide section 43-a, the second guide section 43-b, and the third guide section 43-c is 1:4:1.

[0069] The bending direction at each position on the two wavy guide plates 43 is consistent. Furthermore, the angle between the first guide section 43-a and the second guide section 43-b is the same as the angle between the second guide section 43-b and the third guide section 43-c, both being β. The value of this angle β ranges from 100° to 170°.

[0070] In this embodiment, the included angle β is further taken as 120° to 150°, for example 130°.

[0071] It should be noted that the hopper structure in this utility model can be scaled up proportionally, and its capacity can range from 5L to 1000L. When the capacity increases, the number and size of the guide plate 43, the guide holes 431 on the guide plate 43, etc., can be appropriately increased, as shown in the table below:

[0072]

[0073]

[0074] The arc-shaped or wave-shaped guide plate 43 can increase the contact area and contact time between the guide plate 43 and the solid material, thereby further improving the dispersing effect of the guide plate 43 on the solid material.

[0075] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if such modifications and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.

Claims

1. A high-efficiency mixing hopper structure, comprising a hopper body (1) and a hopper cover (4), wherein the hopper body (1) has a feed inlet (13), and the hopper cover (4) covers the feed inlet (13), characterized in that, It also includes a connecting rod (2), which is fixed to the hopper body (1) and the axis of the connecting rod (2) is perpendicular to the axis of the hopper body (1). The connecting rod (2) is used to drive the hopper body (1) to rotate around the axis of the connecting rod (2). The hopper cover (4) is provided with at least two guide plates (43) for guiding solid materials on the side facing the hopper body (1). All the guide plates (43) have the same length direction and are spaced apart on the hopper cover (4).

2. The high efficiency mixed hopper structure of claim 1, wherein, In the arrangement direction of the guide plate (43), the diameter of the hopper cover (4) is divided into several segments by the guide plate (43).

3. The high-efficiency mixed hopper structure according to claim 2, characterized by, There are two guide plates (43). When the connecting rod (2) rotates clockwise, the angle between the center line of the two guide plates (43) on the hopper cover (4) and the axis of the connecting rod (2) is 10° to 80°. When the connecting rod (2) rotates counterclockwise, the angle between the center line of the two guide plates (43) on the hopper cover (4) and the axis of the connecting rod (2) is 100° to 170°.

4. The high-efficiency mixed hopper structure according to claim 3, characterized by, The cross-sectional shape of the guide plate (43) in the direction perpendicular to its own height is arc-shaped, and the bending directions of the two guide plates (43) are opposite to each other; the range of the bending arc of the guide plate (43) is 0.05π to 0.5π.

5. The high efficiency mixing hopper structure of claim 3, wherein, The cross-sectional shape of the guide plate (43) in the direction perpendicular to its own height is wavy, and the bending direction at each position on the two guide plates (43) is consistent.

6. The high efficiency mixing hopper structure of claim 5, wherein, The guide plate (43) includes a first guide section (43-a), a second guide section (43-b), and a third guide section (43-c), and the length ratio of the first guide section (43-a), the second guide section (43-b), and the third guide section (43-c) is 1:4:1; the included angle between the first guide section (43-a) and the second guide section (43-b) and the included angle between the second guide section (43-b) and the third guide section (43-c) are both in the range of 100° to 170°.

7. The high efficiency mixed hopper structure of claim 1, wherein The guide plate (43) is provided with guide holes (431) for solid materials to pass through.

8. The high-efficiency mixed hopper structure according to claim 7, characterized by, The guide hole (431) is located at the middle position along the length of the guide plate (43), and the area of ​​the guide hole (431) is 20% to 25% of the area of ​​the guide plate (43).

9. The high efficiency mixed hopper structure of claim 1, wherein, The hopper body (1) is provided with a jacket (12), which is used to introduce a heat-conducting medium.

10. The high efficiency mixing hopper structure of claim 1, wherein, It also includes a plug (7), and the hopper cover (4) is provided with a cleaning port (41) and a vent (42). Cleaning water can be introduced into the hopper body (1) through the cleaning port (41), and clean gas can be introduced into the hopper body (1) through the vent (42). The plug (7) can be fixed on the cleaning port (41) and / or the vent (42).

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