Automatic polishing powder adding machine

Abstract

The invention discloses an automatic polishing powder adding machine which comprises a base, a tank body, a shell, a driving mechanism, a transmission assembly, a rotating structure, a material control plate, a material loosening mechanism, an automatic powder suction mechanism, a powder inlet pipe, a pneumatic supercharger, a powder outlet pipe and a rotating disc, the tank body is arranged on one side of the upper portion of the base, and the shell is arranged on the other side of the upper portion of the base; a driving mechanism is arranged in the shell, a transmission assembly matched with the driving mechanism is arranged below the base, a rotating structure matched with the transmission assembly is rotationally arranged in the tank body, and a material control plate is rotationally arranged on the rotating structure; a material loosening mechanism used for dispersing powder is arranged above the material control plate, an automatic powder suction mechanism is further arranged below the base, powder can be automatically and quantitatively supplied into the capsule polishing machine, then it is guaranteed that capsules and a proper amount of powder are fully mixed, and therefore the polishing quality of the capsules is improved.

Description

Technical Field

[0001] The invention relates to the technical field of capsule production and processing, in particular to the technical field of an automatic polishing powder adding machine. Background Art

[0002] Capsules are protective shells for drugs. Drugs packed in capsules are generally powders or granules that are irritating to the esophagus and gastric mucosa, or have a bad taste, are easy to evaporate, are easily decomposed by saliva in the mouth, and are easily inhaled into the trachea. Putting these drugs into capsules not only protects the drug's medicinal properties from being destroyed, but also protects the digestive organs and respiratory tract.

[0003] The capsule polishing machine is a special polishing equipment for capsules. After the medicine is placed in the polishing barrel, the capsule is polished by suction to improve the surface smoothness. The existing capsule polishing machine usually uses a conveying device to transport the powder to the polishing barrel for processing. However, the storage box and the feed pipe of the conveying device are easily blocked and do not have an adjustable function, which reduces the practicality of the conveying device for polishing powder production.

[0004] To solve the problems raised in the background technology, for example, application number CN202023211680.1 discloses a conveying device for polishing powder production, comprising a base, a bracket fixedly connected to the left side of the top of the base, a storage box fixedly connected to the top of the bracket, a first motor fixedly connected to the top of the storage box, and a first transmission rod fixedly connected to the output end of the first motor. Through the coordinated use of the base, the bracket, the storage box, the first motor, the first transmission rod, the stirring rod, the first spiral blade, the first pillar, the conveying box, the second motor, the second transmission rod, the second spiral blade, the bar, the housing, the screw, the first bevel gear, the second pillar, the third motor, the transmission shaft and the second bevel gear, the problem that the storage box and the conveying pipe of the existing conveying device are easily blocked and do not have an adjustable function is solved, which reduces the practicality of the conveying device for polishing powder production and is not conducive to use. However, the device also has the following defects: Although the above device solves the problem of easy blockage of the material storage box and the material conveying pipe, the unloading end of the conveying device is at a higher point of the entire equipment, which causes the polishing powder to be affected by the height during the falling process and cause dust to splash. After the polishing powder falls, dust-containing gas will be generated, which is easy to affect the surrounding environment.

[0005] In order to solve the problems raised in the background technology, for example, application number CN202323384168.0 discloses a conveying device for polishing powder production, comprising: a conveyor housing, one end of the conveyor housing is provided with a feed port, the other end of the conveyor housing is provided with a discharge end, and the end of the conveyor housing close to the feed port is provided with a base. Through the arrangement of a metal telescopic tube, an electric telescopic rod, an upper mounting plate, and a lower mounting plate, the discharge end of the conveyor can be provided with a telescopic adjustment structure, which can be combined with the receiving part below during the discharge process, so that the polishing powder is not easy to splash or leak during the discharge process, and the dust-containing gas is not easy to leak directly from the discharge end. However, the device still has the following defects: Although the above device solves the problem of splashing and leakage of polishing powder during feeding, the device cannot accurately control the amount of powder provided to the polishing machine, and mostly supplies it in approximate amounts, which leads to waste due to excessive amounts or poor polishing effects due to insufficient amounts. Summary of the invention

[0006] The purpose of the present invention is to solve the problems in the prior art and to provide an automatic polishing powder feeder that can automatically and quantitatively supply powder to a capsule polishing machine, thereby ensuring that the capsule is fully mixed with an appropriate amount of powder, thereby improving the polishing quality of the capsule.

[0007] To achieve the above-mentioned purpose, the present invention proposes an automatic polishing powder adding machine, comprising a base, a tank body, a shell, a driving mechanism, a transmission assembly, a rotating structure, a material control plate, a loosening mechanism, an automatic powder suction mechanism, a powder inlet pipe, a pneumatic supercharger, a powder outlet pipe, and a rotating disk. A tank body is provided on one side above the base, a shell is provided on the other side above the base, a driving mechanism is provided inside the shell, a transmission assembly matched with the driving mechanism is provided below the base, a rotating structure matched with the transmission assembly is rotatably provided inside the tank body, and a material control plate is rotatably provided on the rotating structure. A plate, a loosening mechanism for dispersing powder is arranged above the material control plate, an automatic powder suction mechanism is also arranged below the base, the automatic powder suction mechanism comprises a powder inlet pipe, a pneumatic booster and a powder outlet pipe, one end of the powder inlet pipe passes through the inner upper part of the base, the other end of the powder inlet pipe is connected to the input end of the pneumatic booster, the output end of the pneumatic booster is connected to the powder outlet pipe, one end of the powder outlet pipe is connected to an external polishing machine, a rotating disk is fitted at the lower end of the material control plate, the size of the rotating disk is the same as that of the material control plate, and two powder loading holes are arranged on the rotating disk.

[0008] Preferably, an upper cover is provided above the tank body, and a powder adding port is provided in the middle of the upper cover.

[0009] Preferably, a feed pipe is vertically installed inside the tank body, a spring is installed inside the feed pipe, the top end of the spring abuts against the bottom of the upper cover, and the bottom end of the spring abuts against the top of the loosening mechanism.

[0010] Preferably, the driving mechanism comprises a driving motor and a rotating shaft, the driving motor is mounted on the top of the base by bolts, and the output end of the driving motor passes through the bottom of the base and is rotatably connected to the rotating shaft.

[0011] Preferably, the transmission assembly comprises a transmission shaft, a detection disk and a transmission belt. The transmission shaft is rotatably arranged below the base, the detection disk is rotatably connected below the transmission shaft, and the transmission belt is jointly sleeved on the outer wall of the transmission shaft and the rotating shaft.

[0012] Preferably, the rotating structure includes a main shaft, which is rotatably arranged at the inner bottom end of the tank body, the lower end of the main shaft passes through the bottom of the base and is connected to the transmission shaft, and the upper end of the main shaft is rotatably installed with a material control plate and a material loosening mechanism.

[0013] Preferably, the material control plate is provided with a plurality of through holes, which are distributed in a circular shape with equal intervals, and a micro vibrator is provided below the material control plate.

[0014] Preferably, the material loosening mechanism includes a conical dispersion block, four mounting holes and a spring. The conical dispersion block is located in the upper middle part of the material control plate. The outer wall of the conical dispersion block is annularly provided with four mounting holes at equal intervals. A spring is embedded in each mounting hole, and one end of the spring is in contact with the inner wall of the tank body.

[0015] Preferably, a detection sensor is installed below the base by bolts, and a plurality of detection notches are provided on the detection plate. The number of the detection notches is the same as the number of through holes and the positions correspond. The detection sensor is used in conjunction with the detection notches.

[0016] Preferably, a pressing mechanism is installed on the bottom end face of the feed pipe, and the pressing mechanism includes a pressing plate, the top end face of the pressing plate is connected to the bottom end face of the feed pipe, the bottom end face of the pressing plate is fitted with the top of the control plate to prevent powder from entering the gap between the two, and the middle part of the pressing plate is hollow to facilitate the passage of powder, and the middle part of the pressing plate corresponds to the feed pipe and the powder feed pipe.

[0017] Beneficial effects of the present invention: 1. The present invention can automatically and quantitatively supply powder into the capsule polishing machine through the cooperation of the driving mechanism, the transmission assembly, the rotating structure, the material control plate and the automatic powder suction mechanism. First, the polishing powder enters the feed pipe from the powder feeding port in the middle position of the upper cover, and then falls on the material control plate, so that the polishing powder is filled into the through hole on the material control plate. Then, the driving motor is started by an external power supply, and the driving motor drives the rotating shaft to rotate. The rotating shaft drives the transmission shaft to rotate through the transmission belt. The transmission shaft drives the main shaft to rotate during the rotation process, and then drives the material control plate and the conical dispersion block above the main shaft to rotate synchronously. When the through hole on the material control plate rotates to the material pressing plate, the material pressing plate is pressed against the material control plate under the action of the spring, thereby blocking the polishing powder on the material control plate. In this way, it is prevented that excess powder enters the powder inlet pipe, and then the polishing powder falls into the powder loading hole on the rotating disk, thereby ensuring that the polishing powder is supplied each time for the amount of one powder loading hole. Finally, a negative pressure is formed in the powder inlet pipe through the pneumatic booster, so that the polishing powder is sucked into the powder inlet pipe and enters the polishing machine through the powder outlet pipe, thereby achieving the purpose of automatic quantitative transportation. Then, when the through hole filled with powder is rotated out from the pressing plate, the powder on the control plate will be filled into the through hole to fill it up, thereby ensuring that the capsule is fully mixed with the appropriate amount of powder, thereby improving the polishing quality of the capsule, and solving the problem that the amount of powder provided to the polishing machine by the device cannot be accurately controlled, and most of the powder is supplied in an approximate amount, thereby resulting in waste caused by excessive amount or affecting the polishing effect by insufficient amount. 2. The present invention can disperse powders through the cooperation of the loosening mechanism and the micro-vibrator. When the powder falls onto the material control plate, the micro-vibrator is started by an external power supply, so that the micro-vibrator drives the material control plate to vibrate, and the powder with larger particles is crushed by vibration, thereby ensuring that the powder can fall into the through holes on the material control plate evenly. At the same time, when the powder enters the feed pipe from the powder adding port and falls onto the conical dispersion block, the powder will slide down along the side of the conical dispersion block. At the same time, the conical dispersion block will rotate synchronously with the rotation of the material control plate, so that the spring on the side wall of the conical dispersion block will be deformed by force when it contacts the pressure plate, thereby performing reciprocating rebound, so that the powder with larger particles is broken up, avoiding the powder from accumulating in the middle of the material control plate and being unable to fill the through holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of an automatic polishing powder adding machine of the present invention; Figure 2 It is an internal schematic diagram of an automatic polishing powder adding machine of the present invention; Figure 3 It is a bottom schematic diagram of an automatic polishing powder adding machine of the present invention; Figure 4 It is a schematic diagram of a loosening mechanism of an automatic polishing powder adding machine of the present invention; Figure 5 It is a schematic diagram of a detection disk of an automatic polishing powder adding machine of the present invention; Figure 6 It is a schematic diagram of a powder loading hole of an automatic polishing powder adding machine of the present invention; In the figure: 1-base, 2-tank body, 21-upper cover, 211-powder adding port, 22-feeding pipe, 3-housing, 4-driving mechanism, 41-driving motor, 42-rotating shaft, 5-transmission assembly, 51-transmission shaft, 52-detection disk, 522-detection notch, 53-transmission belt, 6-rotating structure, 61-spindle, 7-material control plate, 71-through hole, 8-loosening mechanism, 81-conical dispersion block, 82-mounting hole, 9-automatic powder suction mechanism, 91-powder feeding pipe, 92-pneumatic supercharger, 93-powder outlet pipe, 10-rotating disk, 101-powder loading hole, 11-detection sensor, 12-pressing mechanism, 122-pressing plate. DETAILED DESCRIPTION

[0019] See also Figures 1 to 6 The present invention discloses an automatic powder adding machine for polishing powder, comprising a base 1, a tank body 2, an upper cover 21, a powder adding port 211, a feeding pipe 22, a shell 3, a driving mechanism 4, a transmission component 5, a rotating structure 6, a material control plate 7, a material loosening mechanism 8, an automatic powder suction mechanism 9, a powder feeding pipe 91, a pneumatic supercharger 92, a powder outlet pipe 93, and a rotating disk 10. The tank body 2 is arranged on one side above the base 1, the shell 3 is arranged on the other side above the base 1, the driving mechanism 4 is arranged inside the shell 3, the transmission component 5 matched with the driving mechanism 4 is arranged below the base 1, the rotating structure 6 matched with the transmission component 5 is rotatably arranged inside the tank body 2, the material control plate 7 is rotatably arranged on the rotating structure 6, and a useful A loosening mechanism 8 is provided for dispersing the powder. An automatic powder suction mechanism 9 is also provided under the base 1. The automatic powder suction mechanism 9 includes a powder inlet pipe 91, a pneumatic supercharger 92 and a powder outlet pipe 93. One end of the powder inlet pipe 91 passes through the inner upper part of the base 1, and the other end of the powder inlet pipe 91 is connected to the input end of the pneumatic supercharger 92. The output end of the pneumatic supercharger 92 is connected to the powder outlet pipe 93. One end of the powder outlet pipe 93 is connected to an external polishing machine. A rotating disk 10 is fitted at the lower end of the material control plate 7. The size of the rotating disk 10 is the same as that of the material control plate 7, and two powder loading holes 101 are provided on the rotating disk 10. A powder guide channel is connected between the two powder loading holes 101, and the powder is introduced into the powder loading hole 101 through the powder guide channel.

[0020] See also Figure 1The present invention discloses an automatic polishing powder feeding machine. An upper cover 21 is provided above the tank body 2. A powder feeding port 211 is provided in the middle of the upper cover 21. The powder feeding port 211 enables the powder to enter the feed pipe 22 from the powder feeding port 211.

[0021] See also Figure 2 The present invention provides an automatic powder adding machine for polishing powder, a feed pipe 22 is vertically installed inside the tank body 2, a spring is installed inside the feed pipe 22, the top end of the spring abuts against the bottom of the upper cover 21, and the bottom end of the spring abuts against the top of the loosening mechanism 8. By setting the spring, when the through hole 71 on the material control plate 7 rotates to the material pressing plate 122, the material pressing plate 122 presses against the material control plate 7 under the action of the spring, thereby blocking the polishing powder on the material control plate 7, thereby preventing excess powder from entering the powder feeding pipe 91.

[0022] See also Figure 2 and Figure 3 The present invention discloses an automatic polishing powder adding machine. The driving mechanism 4 includes a driving motor 41 and a rotating shaft 42. The driving motor 41 is installed above the base 1 by bolts. The output end of the driving motor 41 passes through the bottom of the base 1 and is rotatably connected to the rotating shaft 42. The driving motor 41 is started by an external power supply, so that the driving motor 41 drives the rotating shaft 42 to rotate.

[0023] See also Figure 3 The present invention discloses an automatic polishing powder adding machine, wherein the transmission assembly 5 comprises a transmission shaft 51, a detection disk 52 and a transmission belt 53. The transmission shaft 51 is rotatably arranged below the base 1, and the detection disk 52 is rotatably connected below the transmission shaft 51. The transmission belt 53 is jointly sleeved on the outer wall of the transmission shaft 51 and the rotating shaft 42. When the rotating shaft 42 rotates, the transmission shaft 51 is driven to rotate through the transmission belt 53, and the transmission shaft 51 drives the main shaft 61 to rotate during the rotation process.

[0024] See also Figure 4 The present invention is an automatic polishing powder feeding machine, the rotating structure 6 includes a main shaft 61, the main shaft 61 is rotatably arranged at the inner bottom end of the tank body 2, the lower end of the main shaft 61 passes through the bottom of the base 1 and is connected to the transmission shaft 51, and the upper end of the main shaft 61 is rotatably installed with a material control plate 7 and a material loosening mechanism 8. When the main shaft 61 rotates, it drives the material control plate 7 and the material loosening mechanism 8 to rotate synchronously.

[0025] See also Figure 2The present invention discloses an automatic powder adding machine for polishing powder. A plurality of through holes 71 are provided on the material control plate 7. The through holes 71 are distributed in a circular shape with equal intervals. A micro vibrator is provided under the material control plate 7. The micro vibrator drives the material control plate 7 to vibrate, and the powder with larger particles is broken by vibration, thereby ensuring that the powder can evenly fall into the through holes 71 on the material control plate 7.

[0026] See also Figure 4 The present invention relates to an automatic powder feeder for polishing powder. The loosening mechanism 8 includes a conical dispersion block 81, four mounting holes 82 and a spring. The conical dispersion block 81 is located in the upper middle part of the material control plate 7. The outer wall of the conical dispersion block 81 is provided with four mounting holes 82 at equal intervals in a ring shape. A spring is fitted and installed on each mounting hole 82. One end of the spring abuts against the inner wall of the tank body 2. The conical dispersion block 81 rotates synchronously with the rotation of the material control plate 7, so that the spring on the side wall of the conical dispersion block 81 is deformed by force when in contact with the material pressing plate 122, thereby performing reciprocating rebound, so that the powder with larger particles is broken up to avoid the powder accumulating in the middle of the material control plate 7 and being unable to fill the through hole 71.

[0027] See also Figure 5 The present invention relates to an automatic polishing powder feeder. A detection sensor 11 is installed below the base 1 by bolts. A plurality of detection notches 522 are provided on the detection plate 52. The number of the detection notches 522 is the same as the number of through holes 71 and the positions correspond. The detection sensor 11 is used in conjunction with the detection notches 522. By detecting the detection notches 522 with the detection sensor 11, the number of powder in the through hole 71 passing through the powder loading hole 101 can be obtained. This number can be multiplied by the powder loading amount of the through hole 71 to obtain the total supply of powder.

[0028] See also Figure 2 The present invention discloses an automatic powder feeder for polishing powder, wherein a pressing mechanism 12 is installed on the bottom end face of the feed pipe 23, and the pressing mechanism 12 comprises a pressing plate 122, wherein the top end face of the pressing plate 122 is connected to the bottom end face of the feed pipe 23, and the bottom end face of the pressing plate 122 is fitted with the top of the control plate 7 to prevent powder from entering the gap therebetween, and the middle part of the pressing plate 122 is hollow to facilitate the passage of powder, and the middle part of the pressing plate 122 corresponds to the feed pipe 23 and the powder feed pipe 91.

[0029] It should be noted that the spring is not shown in the present application.

[0030] Working process of the present invention: In the working process of the automatic powder adding machine for polishing powder of the present invention, first, the polishing powder enters the feeding pipe 22 from the powder adding port 211 in the middle position of the upper cover 21, and then falls on the material control plate 7, so that the polishing powder is filled into the through hole 71 on the material control plate 7, and then the driving motor 41 is started by an external power supply, the driving motor 41 drives the rotating shaft 42 to rotate, the rotating shaft 42 drives the transmission shaft 51 to rotate through the transmission belt 53, and the transmission shaft 51 drives the main shaft 61 to rotate during the rotation process, thereby driving the material control plate 7 and the conical dispersion block 81 above the main shaft 61 to rotate synchronously, and when the through hole 71 on the material control plate 7 rotates to the material pressing plate 122, the material pressing plate 122 is pressed against the material control plate 7 under the action of the spring. , thereby blocking the polishing powder on the material control plate 7, thereby preventing excess powder from entering the powder inlet pipe 91, and then the polishing powder falls into the powder loading hole 101 on the rotating disk 10, thereby ensuring that the amount of polishing powder supplied each time is the amount filled in one powder loading hole 101, and finally a negative pressure is formed in the powder inlet pipe 91 through the pneumatic supercharger 92, so that the polishing powder is sucked into the powder inlet pipe 91, and then enters the polishing machine through the powder outlet pipe 93, thereby achieving the purpose of automatic quantitative transportation, and then when the through hole 71 filled with powder is rotated out from the pressing plate 122, the powder on the material control plate 7 will be filled into the through hole 71 to fill it up, thereby ensuring that the capsule is fully mixed with an appropriate amount of powder, thereby improving the polishing quality of the capsule.

[0031] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and wiring layout in detail.

[0032] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A polishing powder automatic powder adding machine, characterized in that: The invention comprises a base (1), a tank body (2), a shell (3), a driving mechanism (4), a transmission assembly (5), a rotating structure (6), a material control plate (7), a material loosening mechanism (8), an automatic powder suction mechanism (9), a powder inlet pipe (91), a pneumatic supercharger (92), a powder outlet pipe (93), and a rotating disk (10). The tank body (2) is arranged on one side above the base (1), the shell (3) is arranged on the other side above the base (1), the driving mechanism (4) is arranged inside the shell (3), the transmission assembly (5) matched with the driving mechanism (4) is arranged below the base (1), the rotating structure (6) matched with the transmission assembly (5) is rotatably arranged inside the tank body (2), the material control plate (7) is rotatably arranged on the rotating structure (6), and the material control plate ( A loosening mechanism (8) for dispersing powder is arranged above the base (7), and an automatic powder suction mechanism (9) is also arranged below the base (1). The automatic powder suction mechanism (9) comprises a powder inlet pipe (91), a pneumatic supercharger (92) and a powder outlet pipe (93). One end of the powder inlet pipe (91) passes through the inner upper part of the base (1), and the other end of the powder inlet pipe (91) is connected to the input end of the pneumatic supercharger (92). The output end of the pneumatic supercharger (92) is connected to the powder outlet pipe (93), and one end of the powder outlet pipe (93) is connected to an external polishing machine. A rotating disk (10) is fitted at the lower end of the material control plate (7). The size of the rotating disk (10) is the same as that of the material control plate (7), and the rotating disk (10) is provided with two powder loading holes (101).

2. The automatic polishing powder adding machine according to claim 1, characterized in that: An upper cover (21) is provided above the tank body (2), and a powder adding port (211) is provided in the middle of the upper cover (21).

3. The automatic polishing powder adding machine according to claim 2, characterized in that: A feed pipe (22) is vertically installed inside the tank body (2), and a spring is installed inside the feed pipe (22). The top end of the spring abuts against the bottom of the upper cover (21), and the bottom end of the spring abuts against the top of the loosening mechanism (8).

4. The automatic polishing powder adding machine according to claim 1, characterized in that: The driving mechanism (4) comprises a driving motor (41) and a rotating shaft (42); the driving motor (41) is mounted above the base (1) by means of bolts; an output end of the driving motor (41) passes through the bottom of the base (1) and is rotatably connected to the rotating shaft (42).

5. The automatic polishing powder adding machine according to claim 4, characterized in that: The transmission assembly (5) comprises a transmission shaft (51), a detection disk (52) and a transmission belt (53); the transmission shaft (51) is rotatably arranged below the base (1); the detection disk (52) is rotatably connected below the transmission shaft (51); and the transmission belt (53) is sleeved on the outer wall of the transmission shaft (51) and the rotating shaft (42).

6. The automatic polishing powder adding machine according to claim 5, characterized in that: The rotating structure (6) comprises a main shaft (61), the main shaft (61) being rotatably arranged at the inner bottom end of the tank body (2), the lower end of the main shaft (61) passing through the bottom of the base (1) and being connected to the transmission shaft (51), and the upper end of the main shaft (61) being rotatably mounted with a material control plate (7) and a material loosening mechanism (8).

7. The automatic polishing powder adding machine according to claim 1, characterized in that: The material control plate (7) is provided with a plurality of through holes (71), the through holes (71) are distributed in a circular shape with equal spacing, and a micro vibrator is provided below the material control plate (7).

8. The automatic polishing powder adding machine according to claim 1, characterized in that: The material loosening mechanism (8) comprises a conical dispersion block (81), four mounting holes (82) and a spring. The conical dispersion block (81) is located in the upper middle part of the material control plate (7). The outer wall of the conical dispersion block (81) is provided with four mounting holes (82) at equal intervals in a circular shape. A spring is embedded in each mounting hole (82), and one end of the spring abuts against the inner wall of the tank body (2).

9. An automatic polishing powder adding machine as claimed in claim 5 or 7, characterized in that: A detection sensor (11) is mounted below the base (1) by means of bolts, and a plurality of detection notches (522) are provided on the detection plate (52), the number of the detection notches (522) being the same as the number of the through holes (71) and the positions corresponding to each other, and the detection sensor (11) and the detection notches (522) are used in conjunction with each other.

10. The automatic polishing powder adding machine according to claim 3, characterized in that: A material pressing mechanism (12) is installed on the bottom end surface of the feed pipe (23), and the material pressing mechanism (12) includes a material pressing plate (122). The top end surface of the material pressing plate (122) is connected to the bottom end surface of the feed pipe (23), and the bottom end surface of the material pressing plate (122) is in contact with the top of the material control plate (7) to prevent powder from entering the gap between the two. The middle part of the material pressing plate (122) is hollow to facilitate the passage of powder. The middle part of the material pressing plate (122) corresponds to the feed pipe (23) and the powder feed pipe (91).

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