Fluidized bed coating machine

Abstract

The fluidized bed coating machine comprises a coating assembly, a feeding assembly, a liquid inlet assembly and a discharging assembly, the coating assembly comprises a coating cylinder, an air inlet cylinder, a flow guide cylinder and a spraying pipe, the coating cylinder is a cylindrical cylinder with an opening in the lower end, the air inlet cylinder is in a cylindrical shape with openings in the upper end and the lower end and is fixedly arranged at the lower end of the coating cylinder, and the spraying pipe is fixedly arranged at the upper end of the coating cylinder. A distribution plate is arranged between the air inlet cylinder and the coating cylinder, the guide cylinder is coaxially arranged on the lower portion of the coating cylinder, a gap is reserved between the lower end of the guide cylinder and the distribution plate, the spray pipe is coaxially arranged on the coating cylinder, the upper portion of the spray pipe is located on the lower portion of the guide cylinder, and micropores are evenly distributed in the area, located in the guide cylinder, of the distribution plate. The invention aims to solve or at least alleviate the problem that the existing fluidized bed coating machine cannot guarantee the coating uniformity due to different particle sizes of materials, and provides the fluidized bed coating machine.

Description

Technical Field

[0001] The invention belongs to the technical field of medicine preparation equipment, and in particular relates to a fluidized bed coating machine. Background Art

[0002] Fluidized bed coating machine is a highly efficient, energy-saving, safe and clean mechatronic equipment that can be used for organic film coating, water-soluble film coating, slow-release and controlled-release coating of tablets, pills, candies, etc. During the fluidization process of fluidized bed coating, all particles are suspended in the fluidized air flow, and the surface is completely exposed. Various coating liquids can be sprayed and heat and moisture exchange can be carried out. Among them, the fluidization state is determined by the characteristics of the fluidized material and the structure of the equipment. Due to different technologies, the fluidization state is also different. There are three common spray technologies for coating, namely top spray, bottom spray and side spray. An atomizer is arranged at the center of the bottom-spray fluidized bed distribution plate (5), and a circular guide cylinder is arranged at the center of the material bed with an expansion chamber. The distribution plate (5) has a large opening rate in the guide cylinder area to meet the passage of most of the air volume, forming a fluidized state similar to a fountain. The powder particles rise from the guide cylinder due to the acceleration of the airflow, then leave the guide cylinder and enter the expansion chamber. Then the wind speed drops sharply, causing the material to fall into the annular gap area between the bed body and the guide cylinder. Such a cycle makes the material highly dispersed.

[0003] In the actual production process, due to the difference in particle size of the mixed materials, the material particles are subjected to different forces under the same air flow rate, resulting in different material movement speeds, that is, causing different fluidization states of the materials, which in turn affects the coating uniformity of the materials and reduces the qualified rate of drug coating. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, solve or at least alleviate the problem that the existing fluidized bed coating machine cannot ensure coating uniformity due to different material particle sizes, and provide a fluidized bed coating machine.

[0005] The present invention is achieved through the following technical solutions: A fluidized bed coating machine comprises a coating assembly, a feeding assembly, a liquid feeding assembly and a discharging assembly, wherein the coating assembly comprises a coating cylinder, an air inlet cylinder, a guide cylinder and a nozzle, wherein the coating cylinder is a cylindrical body with an opening at the lower end, the air inlet cylinder is a cylindrical body with openings at both ends and fixedly arranged at the lower end of the coating cylinder, a distribution plate is arranged between the air inlet cylinder and the coating cylinder, the guide cylinder is coaxially arranged at the lower part of the coating cylinder, a gap is left between the lower end of the guide cylinder and the distribution plate, the nozzle is coaxially arranged at the coating cylinder, the upper part of the nozzle is located at the lower part of the guide cylinder, and the area of ​​the distribution plate located in the guide cylinder is uniformly distributed with micropores; The feed assembly is connected to the lower part of the coating cylinder, the liquid inlet assembly is connected to the lower part of the spray pipe, and the discharge assembly is connected to the upper part of the coating cylinder.

[0006] In order to further realize the present invention, the following technical solutions may be preferably selected: Preferably, the coating cylinder comprises a lower coating cylinder and an upper coating cylinder, the lower portion of the upper coating cylinder is longitudinally slidably sleeved on the upper portion of the lower coating cylinder, the guide cylinder comprises a lower guide cylinder and an upper guide cylinder, the lower guide cylinder is fixedly arranged in the lower coating cylinder, the upper guide cylinder is longitudinally slidably sleeved on the lower guide cylinder and is fixedly connected to the upper coating cylinder; The discharging assembly is fixedly connected to the upper packaging tube, and the discharging assembly rises and falls synchronously with the upper packaging tube, and the feeding assembly is connected to the lower packaging tube.

[0007] Preferably, the nozzle is provided with an adjustment mechanism, the adjustment mechanism comprises a liquid inlet cylinder, the liquid inlet cylinder is coaxially fixedly arranged on the distribution plate, and the nozzle is sealingly and slidably sleeved in the liquid inlet cylinder; The nozzle comprises a tube body, a limit plate and a bottom plate, wherein the tube body is a sealed circumferential shell, the outer wall of the tube body is sealed and slidably sleeved on the liquid inlet cylinder, the upper end of the tube body is provided with a spray hole, and the middle side wall of the tube body is evenly distributed with a plurality of through holes, the limit plate is fixedly sleeved on the tube body and located below the through holes, and the bottom plate is fixedly sleeved on the bottom of the tube body and located below the liquid inlet cylinder; When the nozzle is in the uppermost state, the bottom plate presses upwards against the lower end surface of the liquid inlet cylinder; when the nozzle is in the lowermost state, the limit plate presses downwards against the bottom surface of the liquid inlet cylinder.

[0008] Preferably, a guide rod is coaxially fixedly arranged at the lower end of the nozzle, a positioning cylinder is coaxially arranged outside the nozzle, the positioning cylinder is cylindrical with an open upper end, the bottom plate is sealingly slidably sleeved on the positioning cylinder, and the lower end of the guide rod passes downward through the bottom surface of the positioning cylinder; A spring is arranged between the nozzle and the positioning tube. The spring is sleeved on the guide rod. The upper and lower ends of the spring respectively abut against the nozzle and the positioning tube.

[0009] Preferably, a paddle is provided at the lower end of the guide rod, and the paddle is located in the air intake cylinder.

[0010] Preferably, an upper swivel is coaxially rotatably provided on the lower side of the bottom plate of the nozzle, a lower swivel is coaxially rotatably provided on the upper side of the bottom surface of the positioning tube, and the upper and lower ends of the spring are respectively fixedly connected to the upper swivel and the lower swivel.

[0011] Preferably, a stagnation ring is arranged on the outer side of the lower part of the coating cylinder, and the stagnation ring is connected to the upper part of the air inlet cylinder. A section of the circumference of the coating cylinder located on the stagnation ring is evenly distributed with a plurality of stagnation holes, and the stagnation holes are in the shape of a truncated cone with a larger outer side and a smaller inner side.

[0012] Preferably, the feeding assembly comprises a feeding hopper and a screw feeding assembly, the feeding end of the screw feeding assembly is connected to the lower end of the feeding hopper, and the discharging end is connected to the lower part of the coating cylinder.

[0013] Preferably, the discharging assembly includes a discharging barrel and an exhaust pipe. The upper part of the discharging barrel is cylindrical, and the lower part is conical with a larger upper part and a smaller lower part. The exhaust pipe is coaxially fixed on the upper part of the discharging barrel. A filter is provided at the lower end of the exhaust pipe. An axial flow fan is provided in the exhaust pipe. The upper part of the discharging barrel is connected to the upper packaging barrel.

[0014] Preferably, the discharging assembly is provided with a positioning frame, the discharging assembly is longitudinally slidably arranged on the positioning frame, and a heating device is arranged at the lower part of the discharging cylinder.

[0015] Through the above technical solution, the beneficial effects of the present invention are: The guide tube of the present invention can adjust the height. A lower guide tube height will result in less material entering the guide tube, faster material rising speed, and the material will fly out of the guide tube without sufficient contact with the droplets, reducing the coating liquid yield. A higher guide tube height will result in a large amount of material being located in the rising area of ​​the guide tube, slowing the material rising speed, causing the droplets to cause adhesion between the materials, and some materials will not contact the droplets, and will circulate in vain, increasing the wear of the materials. The coating tube adjusts its height synchronously with the guide tube to facilitate the collection of the coated materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural cross-sectional view of the present invention; Figure 3 For the present invention Figure 2 Sectional view at AA in the middle; Figure 4 For the present invention Figure 2 Sectional view at the middle BB; Figure 5 For the present invention Figure 2 Enlarged view of point C in the middle; Figure 6 It is a schematic diagram of the structure of the nozzle of the present invention; Among them: 1-coating cylinder; 2-air inlet cylinder; 3-guide cylinder; 4-nozzle; 5-distribution plate; 6-liquid inlet cylinder; 7-guide rod; 8-positioning cylinder; 9-spring; 10-paddle; 11-upper swivel; 12-lower swivel; 13-stagnation ring; 14-feed hopper; 15-screw feeding assembly; 16-discharge cylinder; 17-exhaust pipe; 18-positioning frame; 101-lower coating cylinder; 102-upper coating cylinder; 301-lower guide cylinder; 302-upper guide cylinder; 401-tube body; 402-limiting plate; 403-bottom plate. DETAILED DESCRIPTION

[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention. Example

[0019] like Figure 1-Figure 6 As shown, a fluidized bed coating machine comprises a coating component, a feeding component, a liquid feeding component and a discharging component, wherein the coating component comprises a coating cylinder 1, an air inlet cylinder 2, a guide cylinder 3 and a nozzle 4, wherein the coating cylinder 1 is a cylindrical body with an opening at the lower end, the air inlet cylinder 2 is a cylindrical body with openings at both ends and fixedly arranged at the lower end of the coating cylinder 1, a distribution plate 5 is arranged between the air inlet cylinder 2 and the coating cylinder 1, the guide cylinder 3 is coaxially arranged at the lower part of the coating cylinder 1, a gap is left between the lower end of the guide cylinder 3 and the distribution plate 5, the nozzle 4 is coaxially arranged at the coating cylinder 1, the upper part of the nozzle 4 is located at the lower part of the guide cylinder 3, and the area of ​​the distribution plate 5 located in the guide cylinder 3 is uniformly distributed with micropores; The feed assembly is connected to the lower part of the coating cylinder 1 , the liquid inlet assembly is connected to the lower part of the spray pipe 4 , and the discharge assembly is connected to the upper part of the coating cylinder 1 .

[0020] The distribution plate 5 is provided with various specifications. When the opening rate of the micropores on the distribution plate 5 is 0.75%, it is suitable for materials with a particle size of 100-250μm. When the opening rate of the micropores on the distribution plate 5 is 1.12%, it is suitable for materials with a particle size of 250-750μm. When the opening rate of the micropores on the distribution plate 5 is 1.85%, it is suitable for materials with a particle size of 750-3000μm. When the opening rate of the micropores on the distribution plate 5 is 7.76%, it is suitable for materials with a particle size of 3000-10000μm.

[0021] The coating cylinder 1 includes a lower coating cylinder 101 and an upper coating cylinder 102. The lower portion of the upper coating cylinder 102 is longitudinally slidably sleeved on the upper portion of the lower coating cylinder 101. The guide cylinder 3 includes a lower guide cylinder 301 and an upper guide cylinder 302. The lower guide cylinder 301 is fixedly disposed in the lower coating cylinder 101. The upper guide cylinder 302 is longitudinally slidably sleeved on the lower guide cylinder 301 and is fixedly connected to the upper coating cylinder 102. The discharging assembly is fixedly connected to the upper packaging tube 102 , and the discharging assembly rises and falls synchronously with the upper packaging tube 102 . The feeding assembly is connected to the lower packaging tube 101 .

[0022] The guide tube 3 of the present invention can adjust the height. A lower guide tube 3 height will result in less material entering the guide tube 3, faster material rising speed, and the material will fly out of the guide tube 3 without sufficient contact with the droplets, reducing the coating liquid yield. A higher guide tube 3 height will result in a large amount of material being located in the rising area of ​​the guide tube 3, slowing the material rising speed, causing the droplets to cause adhesion between the materials, and some materials will not contact the droplets, and will circulate in vain, increasing the wear of the materials. The coating tube 1 adjusts its height synchronously with the guide tube 3 to facilitate the collection of the coated materials.

[0023] In order to be more suitable for materials with different particle sizes, the nozzle 4 is provided with an adjustment mechanism, which includes a liquid inlet cylinder 6, which is coaxially fixed to the distribution plate 5, and the nozzle 4 is sealingly and slidably sleeved in the liquid inlet cylinder 6; The nozzle 4 includes a tube body 401, a limit plate 402 and a bottom plate 403. The tube body 401 is a sealed circumferential shell. The outer wall of the tube body 401 is sealed and slidably sleeved on the liquid inlet cylinder 6. The upper end of the tube body 401 is provided with a spray hole. The middle side wall of the tube body 401 is evenly distributed with a plurality of through holes. The limit plate 402 is fixedly sleeved on the tube body 401 and is located below the through hole. The bottom plate 403 is fixedly sleeved on the bottom of the tube body 401 and is located below the liquid inlet cylinder 6. When the nozzle 4 is at the uppermost position, the bottom plate 403 presses upward against the lower end surface of the liquid inlet cylinder 6 ; when the nozzle 4 is at the lowermost position, the limit plate 402 presses downward against the bottom surface of the liquid inlet cylinder 6 .

[0024] When the particle size of the material is large, the outer surface of a single material is large and heavy. At this time, the air intake is increased to ensure that the material in the guide tube 3 has sufficient lift. The height of the guide tube 3 is increased to allow the material and the droplets to have more contact time to ensure the coating liquid yield. At the same time, the nozzle 4 is moved downward to further increase the contact time.

[0025] When the particle size of the material is small, the outer surface of a single material is small and light. At this time, the air intake is reduced to prevent the material from rising too fast. The height of the guide tube 3 is lowered. After the material and the droplets are fully in contact, the material is separated from the guide tube 3 to avoid excessive droplets causing adhesion between the materials. At the same time, the nozzle 4 rises to further reduce the contact time.

[0026] In order to optimize the product structure, in this embodiment, a guide rod 7 is coaxially fixedly arranged at the lower end of the nozzle 4, and a positioning cylinder 8 is coaxially arranged outside the nozzle 4. The positioning cylinder 8 is cylindrical with an open upper end, and the bottom plate 403 is sealingly slidably sleeved on the positioning cylinder 8. The lower end of the guide rod 7 passes downward through the bottom surface of the positioning cylinder 8. A spring 9 is provided between the nozzle 4 and the positioning tube 8. The spring 9 is sleeved on the guide rod 7. The upper and lower ends of the spring 9 respectively abut against the nozzle 4 and the positioning tube 8.

[0027] When the gas entering from the lower part of the air intake cylinder 2 enters the coating cylinder 1, it will generate pressure on the bottom plate 403 of the nozzle 4, causing the nozzle 4 to move downward. The greater the air intake, the greater the downward force of the nozzle 4, so that the height position of the nozzle 4 is automatically adapted to the air intake of the air intake cylinder 2.

[0028] A paddle 10 is provided at the lower end of the guide rod 7. The paddle 10 is located in the air intake cylinder 2. When air is taken in, the paddle 10 drives the nozzle 4 to rotate, thereby improving the coating effect.

[0029] In order to optimize the product structure and ensure that the spring 9 can stably provide elastic force when the nozzle 4 rotates, an upper swivel ring 11 is coaxially rotatably arranged on the lower side of the bottom plate 403 of the nozzle 4, and a lower swivel ring 12 is coaxially rotatably arranged on the upper side of the bottom surface of the positioning tube 8, and the upper and lower ends of the spring 9 are respectively fixedly connected to the upper swivel ring 11 and the lower swivel ring 12.

[0030] In order to increase the air retention time of the material in the guide cylinder 3 and improve the coating efficiency of the material in a single cycle, an air retention ring 13 is arranged on the outer side of the lower part of the coating cylinder 1. The air retention ring 13 is connected to the upper part of the air inlet cylinder 2. A section of the circumference of the coating cylinder 1 located at the air retention ring 13 is evenly distributed with a plurality of air retention holes, and the air retention holes are in the shape of a truncated cone with a larger outside and a smaller inside.

[0031] The gas ejected from the stagnation ring 13 will form an air flow layer above the guide tube 3. The air flow layer will generate resistance to the material when it leaves the guide tube 3, thereby increasing the stagnation time of the material in the guide tube 3. The stagnation ring 13 is connected to the air inlet tube 2, so that the resistance generated by the air flow layer matches the lift of the material in the guide tube 3.

[0032] The feeding assembly includes a feeding hopper 14 and a spiral feeding assembly 15 . The feeding end of the spiral feeding assembly 15 is connected to the lower end of the feeding hopper 14 , and the discharging end is connected to the lower part of the coating cylinder 1 .

[0033] The discharging assembly includes a discharging barrel 16 and an exhaust pipe 17. The upper portion of the discharging barrel 16 is cylindrical, and the lower portion is conical with a larger upper portion and a smaller lower portion. The exhaust pipe 17 is coaxially fixedly arranged on the upper portion of the discharging barrel 16. A filter is arranged at the lower end of the exhaust pipe 17. An axial flow fan is arranged in the exhaust pipe 17. The upper portion of the discharging barrel 16 is connected to the upper packaging barrel 102. The discharging assembly is provided with a positioning frame 18. The discharging assembly is longitudinally slidably arranged on the positioning frame 18. A heating device is arranged at the lower portion of the discharging barrel 16.

[0034] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fluidized bed coating machine, comprising a coating assembly, a feeding assembly, a liquid inlet assembly and a discharging assembly, characterized in that: The coating assembly comprises a coating cylinder (1), an air inlet cylinder (2), a guide cylinder (3) and a nozzle (4); the coating cylinder (1) is a cylindrical body with an opening at the lower end; the air inlet cylinder (2) is a cylindrical body with openings at both ends and fixedly arranged at the lower end of the coating cylinder (1); a distribution plate (5) is arranged between the air inlet cylinder (2) and the coating cylinder (1); the guide cylinder (3) is coaxially arranged at the lower part of the coating cylinder (1); a gap is left between the lower end of the guide cylinder (3) and the distribution plate (5); the nozzle (4) is coaxially arranged at the coating cylinder (1); the upper part of the nozzle (4) is located at the lower part of the guide cylinder (3); and the area of ​​the distribution plate (5) located in the guide cylinder (3) is uniformly distributed with micropores; The feed assembly is connected to the lower part of the coating cylinder (1), the liquid inlet assembly is connected to the lower part of the spray pipe (4), and the discharge assembly is connected to the upper part of the coating cylinder (1).

2. A fluidized bed coating machine according to claim 1, characterized in that: The coating cylinder (1) comprises a lower coating cylinder (101) and an upper coating cylinder (102), the lower portion of the upper coating cylinder (102) being longitudinally slidably sleeved on the upper portion of the lower coating cylinder (101), the guide cylinder (3) comprising a lower guide cylinder (301) and an upper guide cylinder (302), the lower guide cylinder (301) being fixedly disposed in the lower coating cylinder (101), the upper guide cylinder (302) being longitudinally slidably sleeved on the lower guide cylinder (301) and being fixedly connected to the upper coating cylinder (102); The material discharging assembly is fixedly connected to the upper packaging tube (102), the material discharging assembly rises and falls synchronously with the upper packaging tube (102), and the material feeding assembly is connected to the lower packaging tube (101).

3. A fluidized bed coating machine according to claim 1, characterized in that: The nozzle (4) is provided with an adjustment mechanism, the adjustment mechanism comprising a liquid inlet cylinder (6), the liquid inlet cylinder (6) is coaxially fixedly arranged on the distribution plate (5), and the nozzle (4) is sealingly and slidably sleeved in the liquid inlet cylinder (6); The spray pipe (4) comprises a tube body (401), a limiting plate (402) and a bottom plate (403); the tube body (401) is a sealed circular shell; the outer wall of the tube body (401) is sealingly and slidably sleeved on the liquid inlet cylinder (6); the upper end of the tube body (401) is provided with a spray hole; the middle side wall of the tube body (401) is evenly distributed with a plurality of through holes on the circumference; the limiting plate (402) is fixedly sleeved on the tube body (401) and is located below the through holes; the bottom plate (403) is fixedly sleeved on the bottom of the tube body (401) and is located below the liquid inlet cylinder (6); When the nozzle (4) is in the uppermost position, the bottom plate (403) presses upward against the lower end surface of the liquid inlet cylinder (6); when the nozzle (4) is in the lowermost position, the limit plate (402) presses downward against the bottom surface of the liquid inlet cylinder (6).

4. A fluidized bed coating machine according to claim 3, characterized in that: A guide rod (7) is coaxially fixedly disposed at the lower end of the nozzle (4), a positioning cylinder (8) is coaxially disposed outside the nozzle (4), the positioning cylinder (8) is in the shape of a cylinder with an open upper end, the bottom plate (403) is sealingly slidably sleeved on the positioning cylinder (8), and the lower end of the guide rod (7) passes downwardly out of the bottom surface of the positioning cylinder (8); A spring (9) is provided between the nozzle (4) and the positioning cylinder (8), the spring (9) being sleeved on the guide rod (7), with upper and lower ends of the spring (9) respectively abutting against the nozzle (4) and the positioning cylinder (8).

5. A fluidized bed coating machine according to claim 4, characterized in that: A paddle (10) is provided at the lower end of the guide rod (7), and the paddle (10) is located inside the air intake cylinder (2).

6. A fluidized bed coating machine according to claim 5, characterized in that: An upper rotating ring (11) is coaxially rotatably arranged on the lower side of the bottom plate (403) of the nozzle (4), and a lower rotating ring (12) is coaxially rotatably arranged on the upper side of the bottom surface of the positioning cylinder (8). The upper and lower ends of the spring (9) are respectively fixedly connected to the upper rotating ring (11) and the lower rotating ring (12).

7. A fluidized bed coating machine according to claim 1, characterized in that: A stagnation ring (13) is arranged on the outer side of the lower part of the coating cylinder (1), and the stagnation ring (13) is connected to the upper part of the air inlet cylinder (2). A section of the circumference of the coating cylinder (1) located on the stagnation ring (13) is evenly distributed with a plurality of stagnation holes, and the stagnation holes are in the shape of a truncated cone with a larger outer portion and a smaller inner portion.

8. A fluidized bed coating machine according to claim 1, characterized in that: The feeding assembly comprises a feeding hopper (14) and a screw feeding assembly (15); the feeding end of the screw feeding assembly (15) is connected to the lower end of the feeding hopper (14), and the discharging end is connected to the lower part of the coating cylinder (1).

9. A fluidized bed coating machine according to claim 2, characterized in that: The discharging assembly comprises a discharging barrel (16) and an exhaust pipe (17); the upper portion of the discharging barrel (16) is cylindrical, and the lower portion is conical, with a larger upper portion and a smaller lower portion; the exhaust pipe (17) is coaxially fixedly arranged on the upper portion of the discharging barrel (16); a filter is arranged at the lower end of the exhaust pipe (17); an axial flow fan is arranged in the exhaust pipe (17); and the upper portion of the discharging barrel (16) is connected to the upper package barrel (102).

10. A fluidized bed coating machine according to claim 9, characterized in that: The material discharging assembly is provided with a positioning frame (18), the material discharging assembly is longitudinally slidably arranged on the positioning frame (18), and a heating device is arranged at the lower part of the material discharging cylinder (16).

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