Adjustable plastering device using barium sulfate sand wall surface

Abstract

The invention relates to the technical field of constructional engineering, in particular to an adjustable plastering device using barium sulfate sand wall surfaces, which comprises a base, a sliding rod and a fixed screw rod are welded on the top of the base, a material cavity is slidably mounted above the base, and the material cavity is positioned between the sliding rod and the fixed screw rod; and the sliding rod and the fixed screw rod are sleeved with the sliding sleeve in a sliding manner. Through swinging of the plastering box and vibration of the plastering plate, the plastering plate continuously extrudes the wall surface, air between the mortar and the wall surface is discharged, the adsorption effect between the mortar and the wall body is improved, and the situation that the flatness of the wall body is affected by falling of the mortar is avoided; according to the wall plastering device, the plaster materials are evenly distributed above the plastering plate, the uniformity of plaster feeding is improved, reciprocating sliding is conducted through the plastering plate, the wall surface is roughened through the plastering plate, the adsorption effect between the next layer of plaster materials and the wall surface is improved, meanwhile, a gap between the wall surfaces subjected to two adjacent times of plastering is eliminated, and the overall flatness of the wall surface is improved.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to an adjustable plastering device for barium sulfate sand walls. Background Technology

[0002] Barium sulfate sand, also known as protective barium sand, is widely used in specialized hospital rooms (rooms containing equipment with radiation exposure). These protective barium sand walls are constructed with solid red bricks (with full cement grout filling the brick joints), forming a thick protective layer of barium sulfate mortar applied in repeated layers. During application, cracks in the walls of CT and DR rooms can lead to radiation leakage, a potentially serious problem for patients in a hospital environment. Cracks can become pathways for radiation leakage, increasing the risk of unnecessary radiation exposure. This can not only affect their short-term health but also, in the long term, increase the risk of radiation-related diseases such as cancer. Therefore, ensuring the integrity and airtightness of the walls in CT and DR rooms is crucial for radiation protection. Protecting patients from radiation damage is of paramount importance. During construction, barium sulfate sand walls, due to their special material and purpose, have high requirements for the flatness and uniformity of plastering. Existing plastering equipment, when performing multi-layer construction, directly moves the plaster upward through the material chamber. However, when the adhesion between the plaster and the wall is poor, the plaster will fall off the wall, requiring manual repair after construction. This results in the inability to guarantee the flatness of the wall. In addition, after the wall is plastered, it is still necessary to manually roughen the wall surface and manually repair the gaps between adjacent plastered walls. This not only results in cumbersome construction steps and low construction efficiency, but also a large amount of manual labor, further contributing to the problem of not being able to guarantee the flatness of the wall after repair. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the background art by providing an adjustable plastering device for barium sulfate sand walls.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An adjustable plastering device for barium sulfate sand walls includes a base. A sliding rod and a fixing screw are welded to the top of the base. A material cavity is slidably installed above the base, located between the sliding rod and the fixing screw, and slidably fitted onto the outside of the sliding rod and the fixing screw. A plastering assembly is movably installed inside the material cavity. The plastering assembly includes a plastering box and a plastering board. The plastering box is rotatably installed inside the material cavity. A discharge port is opened on the side wall of the material cavity. The plastering box is located below the discharge port. A torsion spring is provided at the rotatable connection between the plastering box and the material cavity. The plastering board is movably installed on the top of the plastering box. The side wall of the plastering box is integrally formed with a flat surface.

[0006] A drive assembly is movably mounted on the bottom of the base, and the drive assembly is used to adjust the position of the base;

[0007] A feeding assembly is movably mounted on the top of the base, the feeding assembly being used to supply concrete into the material chamber.

[0008] In the above-mentioned adjustable plastering device for barium sulfate sand walls, a gear 1 is rotatably installed on the side wall of the material chamber. The gear 1 is movably fitted onto the outside of the fixed screw. A sliding ball 1 is integrally formed on the inner side of the gear 1. The sliding ball 1 is slidably connected to the sliding groove on the outer peripheral wall of the fixed screw. A motor 1 is fixedly installed on the side wall of the material chamber. A gear 2 is fixedly connected to the output shaft of the motor 1. The gear 1 and gear 2 mesh with each other.

[0009] In the above-mentioned adjustable plastering device for barium sulfate sand walls, a second motor is fixedly installed inside the material chamber, and an intermittent gear is fixedly connected to the output shaft of the second motor. The intermittent gear is located outside the material chamber, and an intermittent gear ring is fixedly installed on the side wall of the plastering box. The intermittent gear ring and the intermittent gear mesh with each other.

[0010] In the above-mentioned adjustable plastering device for barium sulfate sand walls, a rotating roller is rotatably installed inside the plastering box, a bidirectional rotating cylinder and an intermittent toothed cylinder are rotatably installed on the side wall of the rotating roller, a semi-circular slider is slidably installed inside the plastering box, the plastering board is slidably inserted above the semi-circular slider, a sliding ball is integrally formed on the side wall of the semi-circular slider, and the sliding ball is slidably connected to the bidirectional sliding groove on the outer peripheral wall of the bidirectional rotating cylinder.

[0011] In the above-mentioned adjustable plastering device for barium sulfate sand walls, the bottom of the plastering board is integrally formed with a toothed rack, which meshes with an intermittent toothed cylinder. The interior of the plastering box has two slots, and the bidirectional rotating cylinder and the intermittent toothed cylinder are rotatably installed inside the two slots respectively. The semi-circular slider and the toothed rack are slidably installed inside the two slots respectively.

[0012] In the above-mentioned adjustable plastering device for barium sulfate sand walls, a coupling is fixedly installed on the outer peripheral wall of the rotating roller, and a coupling is slidably installed on the side walls of the bidirectional rotating drum and the intermittent toothed drum. The coupling and the coupling are in contact with each other, and a spring is provided between the two couplings and the bidirectional rotating drum and the intermittent toothed drum.

[0013] In the above-mentioned adjustable plastering device for barium sulfate sand walls, a motor three is fixedly installed inside the material chamber, and a pulley one is fixedly connected to the output shaft of the motor three. The pulley one is located outside the material chamber, and a pulley two is fixedly installed on the side wall of the rotating roller. A belt is sleeved on the outer side of the pulley one and the pulley two.

[0014] In the aforementioned adjustable plastering device for barium sulfate sand walls, the driving assembly includes a transverse track and a transverse device. The transverse track is laid on the ground, and the transverse device is slidably installed on the bottom of the base and on the top of the transverse track. The feeding assembly includes a storage bin, which is fixedly installed on the top of the base. A pump is fixedly installed inside the storage bin, and the output end of the pump is fixedly connected to a feeding pipe, which is connected to the material chamber.

[0015] Compared with existing technologies, the advantages of this invention are:

[0016] 1. As the material chamber moves upward, the plastering box swings back and forth, causing the plastering box to continuously press the plastering board against the wall surface, improving the adhesion between the plaster and the wall and the flatness of the wall, thus preventing the plaster from falling off and affecting the flatness of the wall.

[0017] 2. The intermittent toothed cylinder drives the plastering board to vibrate, so that when the plastering board is pressed against the wall, the vibration of the plastering board expels the air between the plaster and the wall, further improving the adsorption effect between the plaster and the wall. When the plastering board is inside the material cavity, the vibration of the plastering board evenly distributes the plaster inside the material cavity above the plastering board, improving the uniformity of plastering and the flatness of the wall surface.

[0018] 3. As the material chamber moves downward, the plastering board contacts the wall surface and is parallel to the wall surface. The plastering board is driven by the bidirectional rotating drum to slide horizontally back and forth, which roughens the wall surface and improves the adhesion between the next layer of plaster and the wall surface. At the same time, it eliminates the gap between adjacent plastering layers and improves the overall flatness of the wall surface. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0020] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

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

[0022] Figure 4 For the present invention Figure 3 Enlarged view of point B in the middle;

[0023] Figure 5 This is a cross-sectional view of the material cavity in this invention;

[0024] Figure 6 This is a schematic diagram of the plastering component in this invention;

[0025] Figure 7 This is a cross-sectional view of the plastering component in this invention;

[0026] Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle;

[0027] Figure 9 This is a schematic diagram of the plastering box in this invention;

[0028] Figure 10 This is a disassembly diagram of the plastering board and rotating roller in this invention;

[0029] Figure 11 This is a schematic diagram of the bidirectional rotating drum in this invention;

[0030] Figure 12 This is a schematic diagram of the intermittent gear cylinder in this invention.

[0031] In the diagram: 1. Base; 11. Storage bin; 12. Horizontal movement device; 13. Horizontal movement track; 14. Slide rod; 15. Fixed lead screw; 151. Gear 1; 152. Gear 2; 153. Motor 1; 154. Sliding ball 1; 21. Material chamber; 211. Feeding pipe; 212. Discharge port; 213. Pump; 22. Plastering box; 221. Intermittent gear; 222. Intermittent gear ring; 223. 1. Plane 1; 224. Motor 2; 225. Groove; 23. Plasterboard; 231. Rotating roller; 232. Semi-circular slider; 233. Sliding ball 2; 234. Motor 3; 235. Pulley 1; 236. Pulley 2; 237. Belt; 238. Rack; 241. Bidirectional rotating drum; 242. Intermittent gear cylinder; 243. Coupling 1; 244. Coupling 2; 245. Spring 1. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., 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 invention 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 invention.

[0034] Reference Figure 1 - Figure 12As shown, an adjustable plastering device for barium sulfate sand walls includes a base 1. A sliding rod 14 and a fixing screw 15 are welded to the top of the base 1. A material cavity 21 is slidably installed above the base 1, located between the sliding rod 14 and the fixing screw 15, and slidably fitted onto the outside of the sliding rod 14 and the fixing screw 15. A plastering assembly is movably installed inside the material cavity 21. The plastering assembly includes a plastering box 22 and a plastering board 23. The plastering box 22 is rotatably installed inside the material cavity 21. A discharge port 212 is opened on the side wall of the material cavity 21. 22 is located below the discharge port 212. A torsion spring is provided at the rotating connection between the plaster box 22 and the material cavity 21. The plastering plate 23 is movably installed on the top of the plaster box 22. The side wall of the plaster box 22 is integrally formed with a flat surface 223. The inside of the material cavity 21 is fixedly installed with a motor 224. The output shaft of the motor 224 is fixedly connected with an intermittent gear 221. The intermittent gear 221 is located on the outside of the material cavity 21. The side wall of the plaster box 22 is fixedly installed with an intermittent gear ring 222. The intermittent gear ring 222 and the intermittent gear 221 mesh with each other.

[0035] A drive assembly is movably mounted on the bottom of base 1, and the drive assembly is used to adjust the position of base 1;

[0036] A feeding assembly is movably mounted on the top of the base 1, which is used to supply concrete into the material chamber 21.

[0037] The working principle of the plastering box 22 is as follows: In the initial state, the torsion spring between the plastering box 22 and the material cavity 21 drives the plastering box 22 to deflect, so that the plastering box 22 drives the plastering board 23 to be parallel and in contact with the wall. When the motor 224 starts, the intermittent gear 221 rotates rapidly. When the intermittent gear 221 and the intermittent gear ring 222 mesh, the intermittent gear ring 222 drives the plastering box 22 to rotate. When the intermittent gear 221 and the intermittent gear ring 222 separate, the torsion spring drives the plastering box 22 and the intermittent gear ring 222 to reverse and return to their original positions. Through the continuous swing of the plastering box 22, the plastering box 22 drives the plastering board 23 to continuously squeeze the plaster material onto the wall, improving the adsorption effect between the plaster material and the wall and the flatness of the wall, and preventing the plaster material from falling off and affecting the flatness of the wall.

[0038] like Figure 2 and Figure 5 As shown, a gear 151 is rotatably mounted on the side wall of the material cavity 21. The gear 151 is movably fitted onto the outside of the fixed lead screw 15. A sliding ball 154 is integrally formed on the inner side of the gear 151. The sliding ball 154 is slidably connected to the groove on the outer peripheral wall of the fixed lead screw 15. A motor 153 is fixedly mounted on the side wall of the material cavity 21. A gear 152 is fixedly connected to the output shaft of the motor 153. The gear 151 and the gear 152 mesh with each other.

[0039] When motor 153 starts and rotates forward, gear 2 152 drives gear 151 to rotate, causing gear 151 to move the material chamber 21 upward. When motor 153 starts and rotates in reverse, gear 151 drives the material chamber 21 to move downward.

[0040] like Figure 6 and Figure 7 As shown, a motor 234 is fixedly installed inside the material cavity 21. The output shaft of the motor 234 is fixedly connected to a pulley 235. The pulley 235 is located on the outside of the material cavity 21. A pulley 236 is fixedly installed on the side wall of the rotating roller 231. A belt 237 is sleeved on the outside of the pulleys 235 and 236.

[0041] When the material chamber 21 moves upward, motors 224 and 234 start. Motor 224 drives the plaster box 22 to swing continuously, and motor 234 drives the rotating roller 231 to rotate forward. When the material chamber 21 moves downward, motor 224 stops, the plaster box 22 returns to its position, the plaster board 23 and the wall surface come into contact and become parallel to each other, and motor 234 starts and the rotating roller 231 rotates in reverse.

[0042] like Figure 4 and Figures 7-10 As shown, a rotating roller 231 is rotatably installed inside the plastering box 22. A bidirectional rotating cylinder 241 and an intermittent toothed cylinder 242 are rotatably installed on the side wall of the rotating roller 231. A semi-circular slider 232 is slidably installed inside the plastering box 22. The plastering plate 23 is slidably inserted above the semi-circular slider 232. A sliding ball 233 is integrally formed on the side wall of the semi-circular slider 232. The sliding ball 233 is slidably connected to the bidirectional groove on the outer peripheral wall of the bidirectional rotating cylinder 241.

[0043] like Figure 9 and Figure 10 As shown, the bottom of the plastering board 23 is integrally formed with a rack 238, which meshes with the intermittent toothed cylinder 242. The interior of the plastering box 22 has two slots 225. The bidirectional rotating cylinder 241 and the intermittent toothed cylinder 242 are respectively rotatably installed inside the two slots 225. The semi-circular slider 232 and the rack 238 are respectively slidably installed inside the two slots 225.

[0044] like Figure 8 and Figures 10-12 As shown, a coupling 243 is fixedly installed on the outer peripheral wall of the rotating roller 231, and a coupling 244 is slidably installed on the side walls of the bidirectional rotating drum 241 and the intermittent gear cylinder 242. The coupling 243 and the coupling 244 abut against each other, and a spring 245 is provided between the two couplings 244 and the bidirectional rotating drum 241 and the intermittent gear cylinder 242.

[0045] When the rotating roller 231 rotates forward, it drives the intermittent toothed cylinder 242 to rotate via coupling 243 and coupling 244. When the intermittent toothed cylinder 242 and the rack 238 mesh, the rack 238 drives the plastering board 23 to move upward. When the intermittent toothed cylinder 242 and the rack 238 separate, the plaster material above the plastering board 23 presses against the plastering board 23, causing the plastering board 23 to drive the rack 238 to move downward and return to its original position. 2. Drive the plastering board 23 to move upward continuously, causing the plastering board 23 to vibrate. When the plastering board 23 is pressed against the wall, the vibration of the plastering board 23 expels the air between the plaster and the wall, further improving the adsorption effect between the plaster and the wall. When the plastering board 23 is inside the material cavity 21, the vibration of the plastering board 23 evenly distributes the plaster inside the material cavity 21 above the plastering board 23, improving the uniformity of plastering and the flatness of the wall.

[0046] Further reference Figure 8 and Figure 11 To explain, when the rotating roller 231 reverses, the rotating roller 231 drives the bidirectional rotating drum 241 to rotate through coupling one 243 and coupling two 244. The bidirectional rotating drum 241 drives the plaster board 23 to slide laterally back and forth through the sliding ball two 233. At this time, the plaster board 23 is in contact with the wall and parallel to each other, so that the plaster board 23 roughens the wall surface, improves the adhesion between the next layer of plaster and the wall surface. At the same time, the reciprocating sliding of the plaster board 23 after contacting the wall surface eliminates the gap between two adjacent plastered walls, improving the overall flatness of the wall surface.

[0047] like Figure 1 and Figure 3 As shown, the drive assembly includes a transverse track 13 and a transverse device 12. The transverse track 13 is laid on the ground, and the transverse device 12 is slidably installed on the bottom of the base 1 and on the top of the transverse track 13. The feeding assembly includes a storage box 11, which is fixedly installed on the top of the base 1. A pump 213 is fixedly installed inside the storage box 11, and the output end of the pump 213 is fixedly connected to a feeding pipe 211. The feeding pipe 211 is connected to the material chamber 21.

[0048] The thickness of each layer of plaster is controlled by the distance between the horizontal track 13 and the wall. When the pump 213 is started, the pump 213 delivers plaster into the material chamber 21. During the process of hanging the mesh on the wall, the material chamber 21 moves upward. At this time, the motor 224 is turned off, so that the plastering board 23 touches the mesh. The contact of the plastering board 23 ensures that the mesh is tight and avoids the mesh from being loose, which would affect the effect of plastering the wall.

[0049] The working principle and usage of this invention are explained in detail below: After the wall mesh is installed, pump 213 starts and conveys mortar into the material chamber 21. Motors 153, 224, and 234 start. Motor 153 drives the material chamber 21 to move upward, and motor 224 drives the plaster box 22 to oscillate back and forth. Through the continuous oscillation of the plaster box 22, the plaster box 22 drives the plaster board 23 to continuously press against the wall surface, improving the adsorption effect between the mortar and the wall and the flatness of the wall, and preventing mortar from falling off and affecting the flatness of the wall. Motor 234 rotates forward and drives the plaster board 23 to vibrate through the intermittent toothed cylinder 242. When the plaster board 23 presses against the wall surface, the vibration of the plaster board 23 discharges the mortar that is trapped between the plaster and the wall surface. Air further enhances the adsorption effect between the plaster and the wall. When the plastering board 23 is inside the material cavity 21, the vibration of the plastering board 23 evenly distributes the plaster inside the material cavity 21 above the plastering board 23, improving the uniformity of plastering and the flatness of the wall surface. When the material cavity 21 moves to the top, the motor 153 drives the material cavity 21 to move downward. At this time, the motor 224 is turned off, the plastering box 22 returns to its position, and the plastering board 23 abuts against the wall surface and is parallel to the wall surface. The motor 334 reverses and drives the plastering board 23 to slide horizontally back and forth through the bidirectional rotating drum 241. The back and forth sliding of the plastering board 23 roughens the wall surface, improves the adsorption effect between the next layer of plaster and the wall surface, and eliminates the gap between two adjacent plastered walls, improving the overall flatness of the wall surface.

[0050] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adjustable plastering device for barium sulfate sand walls, comprising a base (1), characterized in that: A sliding rod (14) and a fixing screw (15) are welded to the top of the base (1). A material cavity (21) is slidably installed above the base (1). The material cavity (21) is located between the sliding rod (14) and the fixing screw (15) and is slidably fitted onto the outside of the sliding rod (14) and the fixing screw (15). A plastering assembly is movably installed inside the material cavity (21). The plastering assembly includes a plastering box (22) and a plastering board (23). The plastering box (22) is rotatably installed inside the material cavity (21). The side wall of the material cavity (21) is provided with a discharge port (212). The plastering box (22) is located below the discharge port (212). A torsion spring is provided at the rotatable connection between the plastering box (22) and the material cavity (21). The plastering board (23) is movably installed on the top of the plastering box (22). The side wall of the plastering box (22) is integrally formed with a flat surface (223). A drive assembly is movably mounted on the bottom of the base (1), and the drive assembly is used to adjust the position of the base (1); A feeding assembly is movably mounted on the top of the base (1), the feeding assembly being used to supply concrete into the material cavity (21).

2. The adjustable plastering device for barium sulfate sand walls according to claim 1, characterized in that: Gear 1 (151) is rotatably mounted on the side wall of the material cavity (21). Gear 1 (151) is movably fitted on the outside of the fixed screw (15). A sliding ball 1 (154) is integrally formed on the inner side of gear 1 (151). The sliding ball 1 (154) is slidably connected to the groove on the outer peripheral wall of the fixed screw (15). Motor 1 (153) is fixedly mounted on the side wall of the material cavity (21). Gear 2 (152) is fixedly connected to the output shaft of motor 1 (153). Gear 1 (151) and gear 2 (152) mesh with each other.

3. The adjustable plastering device for barium sulfate sand walls according to claim 1, characterized in that: An electric motor (224) is fixedly installed inside the material cavity (21). An intermittent gear (221) is fixedly connected to the output shaft of the electric motor (224). The intermittent gear (221) is located outside the material cavity (21). An intermittent gear ring (222) is fixedly installed on the side wall of the plaster box (22). The intermittent gear ring (222) and the intermittent gear (221) mesh with each other.

4. The adjustable plastering device for barium sulfate sand walls according to claim 1, characterized in that: The plastering box (22) is rotatably mounted with a rotating roller (231). The side wall of the rotating roller (231) is rotatably mounted with a bidirectional rotating cylinder (241) and an intermittent toothed cylinder (242). The plastering box (22) is slidably mounted with a semi-circular slider (232). The plastering board (23) is slidably inserted above the semi-circular slider (232). The side wall of the semi-circular slider (232) is integrally formed with a sliding ball (233). The sliding ball (233) is slidably connected to the bidirectional groove on the outer peripheral wall of the bidirectional rotating cylinder (241).

5. The adjustable plastering device for barium sulfate sand walls according to claim 4, characterized in that: The bottom of the plastering board (23) is integrally formed with a rack (238), which meshes with the intermittent toothed cylinder (242). The interior of the plastering box (22) has two slots (225). The bidirectional rotating cylinder (241) and the intermittent toothed cylinder (242) are rotatably installed inside the two slots (225), and the semi-circular slider (232) and the rack (238) are slidably installed inside the two slots (225).

6. The adjustable plastering device for barium sulfate sand walls according to claim 4, characterized in that: A coupling one (243) is fixedly installed on the outer peripheral wall of the rotating roller (231). A coupling two (244) is slidably installed on the side walls of the bidirectional rotating drum (241) and the intermittent toothed cylinder (242). The coupling one (243) and the coupling two (244) abut against each other. A spring one (245) is provided between the two coupling two (244) and the bidirectional rotating drum (241) and the intermittent toothed cylinder (242).

7. The adjustable plastering device for barium sulfate sand walls according to claim 4, characterized in that: The material cavity (21) is fixedly installed with a motor three (234). The output shaft of the motor three (234) is fixedly connected to a pulley one (235). The pulley one (235) is located on the outside of the material cavity (21). The side wall of the rotating roller (231) is fixedly installed with a pulley two (236). The outer sides of the pulley one (235) and the pulley two (236) are fitted with belts (237).

8. The adjustable plastering device for barium sulfate sand walls according to claim 1, characterized in that: The drive assembly includes a transverse track (13) and a transverse device (12). The transverse track (13) is laid on the ground. The transverse device (12) is slidably installed on the bottom of the base (1) and on the top of the transverse track (13). The feeding assembly includes a storage box (11). The storage box (11) is fixedly installed on the top of the base (1). A pump (213) is fixedly installed inside the storage box (11). The output end of the pump (213) is fixedly connected to a feeding pipe (211). The feeding pipe (211) is connected to the material chamber (21).

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