Pyrography film printing equipment
By introducing a powder circulation loop system and automated control into the heat transfer film printing equipment, the problems of insufficient automation in the powder transfer process and the lack of a powder return mechanism have been solved, realizing efficient recycling of powder and uniform transfer of patterns, thereby improving the automation level and printing quality of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-04-03
AI Technical Summary
Existing heat transfer film printing equipment lacks sufficient automation in the toner transfer process, making it impossible to transfer toner accurately. The absence of a toner return mechanism leads to reliance on manual intervention, resulting in poor toner removal and causing residual or unevenly distributed toner layers after pattern transfer, which affects product quality and aesthetics.
A heat transfer film printing device was designed, which adopts a powder circulation loop system, including a powder spreading module, a detachment chamber, a powder feeding conveyor, and a powder return collection tank. It is equipped with a powder flow controller, a laser detection sensor, an axial flow fan, and a drive motor. The control system realizes automated control to ensure accurate powder transfer and recycling.
It enables efficient recycling of powder, reduces production costs, improves automation and printing accuracy, ensures pattern uniformity and product quality, and reduces the impact of human intervention and operational errors.
Smart Images
Figure CN224075342U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of printing and automation control technology, and in particular to a heat transfer film printing device. Background Technology
[0002] With the rise of personalized customization, the demand for heat transfer film printed products in fields such as clothing and home furnishings is experiencing explosive growth, as people yearn to express their individuality through unique designs. However, existing heat transfer film printing equipment has slight shortcomings in toner transfer, occasionally resulting in uneven toner distribution, which slightly affects the rendering of fine details in the design, and sometimes there is slight toner leakage, increasing cleaning costs. To overcome these limitations, new heat transfer film printing equipment is emerging, focusing on solving the toner transfer problem through technological innovation and ingenious design, significantly improving printing quality and efficiency, and injecting new vitality into the personalized customization industry.
[0003] Existing heat transfer film printing equipment suffers from numerous drawbacks in the toner transfer process. Firstly, its automation level is severely insufficient, failing to achieve autonomous and precise toner transfer based on the printing flow, resulting in excessive reliance on manual intervention. Secondly, the lack of a toner recycling mechanism is a major pain point; after toner application, the equipment cannot automatically recover excess powder, requiring manual collection at regular intervals for reuse—a cumbersome and time-consuming process that significantly impacts work efficiency and consistency. Furthermore, the powder removal effect is unsatisfactory; powder on the heat transfer film is difficult to detach smoothly at the appropriate time, leading to powder residue or uneven distribution after pattern transfer, severely damaging product quality and aesthetics. Improvements are urgently needed to meet the ever-growing demand for personalized customization. Therefore, we propose a heat transfer film printing equipment to address the aforementioned problems. Utility Model Content
[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.
[0005] Therefore, the purpose of this utility model is to provide a heat transfer film printing device that can solve many drawbacks in the powder transfer process of existing heat transfer film printing devices. Firstly, the level of automation is severely insufficient; it cannot achieve autonomous and precise powder transfer operations according to the printing process, and it relies too heavily on manual intervention. Secondly, the lack of a powder return mechanism is a major pain point. After powder application, the device cannot automatically recover excess powder, requiring manual collection at regular intervals for reuse. This process is cumbersome and time-consuming, greatly affecting work efficiency and continuity. Furthermore, the powder removal effect is also unsatisfactory; powder on the heat transfer film is difficult to detach smoothly at the appropriate time, resulting in powder residue or uneven distribution after pattern transfer, seriously damaging product quality and aesthetics. Improvements are urgently needed to meet the growing demand for personalized customization.
[0006] To solve the above-mentioned technical problems, this utility model provides a heat transfer film printing device, which adopts the following technical solution: It includes a device housing, within which a power transmission shaft is axially rotatably connected; a powder dispensing module and a powder release chamber are provided on the front side of the device housing; the powder dispensing module has a funnel-shaped powder receiving cavity inside; a powder return collection trough is provided below the powder release chamber; and a powder feeding conveyor trough is provided below the powder receiving cavity; powder transmission pipes are provided at the left and right ends of the front side of the device housing, connecting the powder feeding conveyor trough and the powder return collection trough; a powder circulation conveyor belt is installed inside the powder transmission pipe, the powder feeding conveyor trough, and the powder return collection trough; a connecting belt is provided in the middle of the powder circulation conveyor belt; and partition plates are spaced apart on the connecting belt; the powder circulation conveyor belt makes the powder feeding conveyor trough, the powder transmission pipe, and the powder return collection trough form a powder circulation loop.
[0007] Optionally, several powder flow controllers are bolted to the bottom of the powder conveying trough. The powder flow controllers are used to precisely control the powder flow rate. Powder nozzles are welded to the bottom of the powder flow controllers. The powder conveying trough is located directly below the powder loading block.
[0008] Optionally, the powder spreading module is fixed to the front side of the equipment housing by bolts, and a door panel is hinged to the top of the powder spreading module. A powder loading block is welded into the powder receiving cavity. The powder loading block is made of wear-resistant engineering plastic and its surface is polished.
[0009] Optionally, a powder leakage control device is installed below the unloaded block via a snap-fit mechanism, and a laser detection sensor is fastened to the left side of the powder loading block.
[0010] Optionally, a drive motor is bolted to the left side of the equipment housing, and the powder transfer pipe on the left side passes through the drive motor and is powered by it to drive the powder circulation conveyor belt.
[0011] Optionally, an axial fan is bolted to the rear side of the powder release chamber, and an auxiliary vibration tube is rotatably connected to the front side of the powder release chamber via a bearing. The auxiliary vibration tube is driven by a drive motor.
[0012] Optionally, the inner wall of the powder transfer pipe is smooth, and the connection with the powder feeding trough and the powder return collection trough is rounded. The powder circulation conveyor belt is made of wear-resistant rubber, the connecting belt is made of high-strength nylon, the partition plate is made of plastic and is hot-melt welded to the connecting belt, and the partition plate is 10 mm high and 110 mm apart.
[0013] Optionally, the device is equipped with a control system, which is electrically connected to a powder flow controller for regulating the powder flow rate in the powder conveying trough, a powder leakage control device located below the powder loading block to control powder leakage, a laser detection sensor installed on the left side of the powder loading block for monitoring powder condition, an axial flow fan installed on the rear side of the powder release chamber, an auxiliary vibration tube located on the front side of the powder release chamber, a drive motor that provides power to the left powder transfer tube, and a drive device that drives the powder circulation conveyor belt.
[0014] In summary, this utility model has at least one of the following beneficial effects:
[0015] 1. By installing a powder circulation conveyor belt made of wear-resistant rubber, a connecting belt made of high-strength nylon, plastic partition plates heat-fused to the connecting belt, and a powder transfer pipe with smooth inner walls and rounded corners at the joints, along with a powder feeding trough and a powder return collection trough, a powder circulation loop is formed. This achieves the goal of powder recycling, reducing powder waste, lowering production costs, increasing powder utilization, and ensuring smooth and unobstructed powder transmission, reducing accumulation and blockage, and improving the stability and reliability of equipment operation.
[0016] 2. A control system electrically connected to components such as the powder flow controller, powder leakage control device, laser detection sensor, axial fan, auxiliary vibration tube, drive motor, and conveyor belt drive device achieves intelligent and automated control of key components. This enables precise adjustment of operating parameters according to the printing task, improving the automation level of the equipment, reducing manual intervention, enhancing the printing accuracy and quality of heat transfer film, ensuring efficient and stable printing, and minimizing adverse effects caused by human error. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0019] Figure 2 This is a partial structural schematic diagram of the present invention;
[0020] Figure 3 This is a cross-sectional structural diagram of the powder spreading module of this utility model;
[0021] Figure 4 This is a partial cross-sectional structural diagram of the powder spreading module of this utility model;
[0022] Figure 5 This is a cross-sectional view of the front of the entire utility model.
[0023] Explanation of reference numerals in the attached drawings: 1. Equipment housing; 2. Power transmission shaft; 3. Powder spreading module; 4. Powder release chamber; 5. Powder receiving cavity; 6. Powder return collection tank; 7. Powder conveying tank; 8. Powder transfer pipe; 9. Powder circulation conveyor belt; 10. Connecting belt; 11. Divider plate; 12. Powder flow controller; 13. Powder nozzle; 14. Powder loading block; 15. Door panel; 16. Hinge; 17. Powder leakage control device; 18. Laser detection sensor; 19. Drive motor; 20. Axial flow fan; 21. Auxiliary vibration tube; 22. Control system. Detailed Implementation
[0024] The following is in conjunction with the appendix Figure 1-5 The present invention will be described in further detail below.
[0025] Example 1, refer to Figure 1-5In this embodiment, to address the numerous shortcomings of existing heat transfer film printing equipment in the toner transfer stage, the following solutions are proposed: First, the level of automation is severely insufficient, failing to achieve autonomous and precise toner transfer based on the printing process, resulting in excessive reliance on manual intervention. Second, the lack of a toner return mechanism is a major pain point; after toner application, the equipment cannot automatically recover excess powder, requiring manual collection at regular intervals for reuse—a cumbersome and time-consuming process that significantly impacts work efficiency and continuity. Furthermore, the powder removal effect is unsatisfactory; powder on the heat transfer film is difficult to detach smoothly at the appropriate time, leading to powder residue or uneven distribution after pattern transfer, severely damaging product quality and aesthetics. This necessitates improvement to meet the ever-increasing demand for personalized customization. Therefore, this utility model discloses a heat transfer film printing device.
[0026] The device includes a housing 1, with a power transmission shaft 2 axially rotatably connected inside the housing 1. A powder spreading module 3 and a powder release chamber 4 are located on the front side of the housing 1. The powder spreading module 3 has a funnel-shaped powder receiving cavity 5 inside. A return powder collection trough 6 is located below the powder release chamber 4, and a powder conveying trough 7 is located below the powder receiving cavity 5. Powder transmission pipes 8 are located at the left and right ends of the front side of the housing 1, connecting the powder conveying trough 7 and the return powder collection trough 6. A powder circulation conveyor belt 9 is installed inside the powder transmission pipe 8, the powder conveying trough 7, and the return powder collection trough 6. A connecting belt 10 is located in the middle of the powder circulation conveyor belt 9, and partition plates 11 are spaced on the connecting belt 10. The powder circulation conveyor belt 9 forms a powder circulation loop with the powder conveying trough 7, the powder transmission pipe 8, and the return powder collection trough 6. The housing 1 provides stable support and protection for the internal components. The power transmission shaft 2, axially connected within the equipment housing 1, provides the power foundation for the operation of the equipment. The powder spreading module 3 and the powder detachment chamber 4, located on the front side of the equipment housing 1, respectively achieve precise powder spreading and effective powder detachment. The funnel-shaped powder receiving cavity 5 inside the powder spreading module 3 facilitates powder storage and smooth falling. The powder return collection trough 6 below the powder detachment chamber 4 and the powder conveying trough 7 below the powder receiving cavity 5, together with the powder transmission pipe 8 connecting the left and right ends of the front side of the equipment housing 1, and the powder circulation conveyor belt 9 with connecting belt 10 and partition plate 11 installed in the powder transmission pipe 8, the powder conveying trough 7, and the powder return collection trough 6, constitute a powder circulation loop, achieving the purpose of powder recycling, reducing powder waste, lowering production costs, and improving the automation level and production efficiency of the equipment.
[0027] Several powder flow controllers 12 are bolted and installed below the powder feeding conveyor 7. The powder flow controllers 12 are used to precisely control the powder flow rate. Powder nozzles 13 are welded and installed below the powder flow controllers 12. The powder feeding conveyor 7 is located directly below the powder loading block 14. By bolting and installing several powder flow controllers 12 below the powder feeding conveyor 7, and welding and installing powder nozzles 13 below the powder flow controllers 12, and by setting the powder feeding conveyor 7 directly below the powder loading block 14, the purpose of precisely controlling the flow rate of powder from the powder loading block 14 through the powder feeding conveyor 7 to the powder nozzles 13 is achieved. This ensures that the powder can be evenly ejected through the powder nozzles 13 in an appropriate amount, improving the uniformity and accuracy of powder distribution during heat transfer film printing, thereby improving the printing quality and yield of heat transfer film.
[0028] The powder dispensing module 3 is bolted to the front of the equipment housing 1. A door panel 15 is hinged to the top of the powder dispensing module 3 via a hinge 16. A powder loading block 14 is welded into the powder receiving cavity 5. The powder loading block 14 is made of wear-resistant engineering plastic and has a polished surface. Bolting the powder dispensing module 3 to the front of the equipment housing 1 ensures its stable installation. The hinged door panel 15 facilitates maintenance, inspection, and powder addition within the module. Welding the powder loading block 14 into the powder receiving cavity 5 ensures its fixed position and secure connection. The wear-resistant engineering plastic material and polished surface of the powder loading block 14 extend its service life, reduce powder adhesion, and facilitate smooth powder flow. This improves the stability and reliability of the powder dispensing module 3, making the powder dispensing process smoother and more efficient, and ensuring stable operation of the heat transfer film printing equipment.
[0029] A powder leakage control device 17 is installed below the unloading block via a snap-fit mechanism, and a laser detection sensor 18 is fastened to the left side of the powder loading block 14. By installing the powder leakage control device 17 below the powder loading block 14 via a snap-fit mechanism and fastening the laser detection sensor 18 to the left side of the powder loading block 14, the purpose of effectively controlling powder leakage and avoiding unnecessary powder loss and contamination of the equipment's interior is achieved, while also enabling real-time monitoring of the powder status within the powder loading block 14. This ensures the accuracy of powder usage and the stability of equipment operation, reduces print quality degradation or equipment malfunctions caused by powder leakage and insufficient powder quantity, and improves the working efficiency and print quality of the heat transfer film printing equipment.
[0030] A drive motor 19 is bolted to the left side of the equipment housing 1. The powder transfer pipe 8 on the left side passes through the drive motor 19 and is powered by it to drive the powder circulation conveyor belt 9. By bolting the drive motor 19 to the left side of the equipment housing 1 and allowing the powder transfer pipe 8 to pass through the drive motor 19, the drive motor 19 provides power to drive the powder circulation conveyor belt 9, thus achieving the purpose of providing a stable power source for the powder circulation system. This ensures that the powder can continuously and stably circulate in the loop formed by the powder feeding trough 7, the powder transfer pipe 8, and the return powder collection trough 6, thereby reducing powder waste, improving powder utilization, and enhancing the automation level and working efficiency of the heat transfer film printing equipment.
[0031] An axial fan 20 is bolted to the rear of the powder removal chamber 4, and an auxiliary vibration tube 21 is rotatably connected to the front of the powder removal chamber 4 via a bearing. The auxiliary vibration tube 21 is driven by a drive motor 19. By bolting the axial fan 20 to the rear of the powder removal chamber 4 and rotatably connecting the auxiliary vibration tube 21 driven by the drive motor 19 to the front of the powder removal chamber 4, the purpose of removing powder from the heat transfer film in the powder removal chamber 4 from the powder is achieved in multiple angles and in multiple ways. This realizes the effect of effectively removing excess powder from the surface of the heat transfer film by utilizing the airflow generated by the axial fan 20 and the vibration of the auxiliary vibration tube 21, thereby improving the powder removal efficiency and quality and ensuring the precision and finished product quality of the heat transfer film in subsequent processing.
[0032] The powder transfer tube 8 has a smooth inner wall, and its connection with the powder feeding trough 7 and the powder return collection trough 6 is rounded. The powder circulation conveyor belt 9 is made of wear-resistant rubber, the connecting belt 10 is made of high-strength nylon, and the partition plate 11 is made of plastic and is hot-melt welded to the connecting belt 10. The partition plate 11 is 10 mm high and 110 mm apart. By making the inner wall of the powder transfer tube 8 smooth and the connection with the powder feeding trough 7 and the powder return collection trough 6 rounded, and by making the powder circulation conveyor belt 9 of wear-resistant rubber, the connecting belt 10 of high-strength nylon, and the partition plate 11 of plastic and hot-melt welded to the connecting belt 10, and by setting the height of the partition plate 11 to 10 mm and the spacing to 110 mm, the resistance and accumulation of powder during the transmission process are reduced, ensuring the structural strength and durability of the conveyor belt, and precisely controlling the amount of powder conveyed each time. This achieves smooth powder transmission in the circulation loop, extends the service life of the conveyor belt, improves the stability and reliability of the powder circulation system, and thus improves the overall working efficiency and printing quality of the heat transfer film printing equipment.
[0033] The equipment is equipped with a control system 22, which is electrically connected to a powder flow controller 12 for regulating the powder flow rate in the powder conveying trough 7, a powder leakage control device 17 located below the powder loading block 14 to control powder leakage, a laser detection sensor 18 installed on the left side of the powder loading block 14 to monitor the powder condition, an axial flow fan 20 installed on the rear side of the powder removal chamber 4, an auxiliary vibration tube 21 located on the front side of the powder removal chamber 4, a drive motor 19 that provides power to the left powder transfer tube 8, and a drive device that drives the powder circulation conveyor belt 9. The equipment is equipped with a control system 22, which is connected to the powder conveying trough 7 for regulating the powder flow rate. The powder flow controller 12, the powder leakage control device 17, the laser detection sensor 18 for monitoring powder condition, the axial fan 20 behind the powder removal chamber 4, the auxiliary vibration tube 21 in front of the powder removal chamber 4, the drive motor 19 that provides power to the left powder transfer tube 8, and the drive device that drives the powder circulation conveyor belt 9 are electrically connected to achieve centralized and precise control of the key components of the equipment. This enables automatic adjustment of the working status of each component according to printing requirements, improves the automation level of the equipment, ensures efficient and orderly powder transfer, spreading, and powder removal, improves the accuracy and quality of heat transfer film printing, and reduces human intervention and operational errors.
[0034] Analysis of the dynamic and precise control function of the control system 22: In this heat transfer film printing equipment, the control system 22 plays a key role as the intelligent central hub, realizing the precise coordinated operation of various components of the equipment. Upon startup, it first performs a self-check to ensure that all connected components are functioning properly. After the operator inputs relevant parameters for the printing task, such as the heat transfer film size and pattern complexity, the system allocates initial working parameters according to a preset algorithm. During printing, regarding powder flow, the control system 22 adjusts the opening and closing degree of the powder flow controller 12 in real time according to the density of the pattern. For example, when printing complex and intricate patterns, the flow is increased to ensure detail rendering. Regarding the powder leakage control device 17, the control system 22, based on feedback from the laser detection sensor 18, quickly adjusts the device to prevent leakage if it detects an abnormal decrease in powder within the powder loading block 14. The operating status of the axial fan 20 and the auxiliary vibration tube 21 is also adjusted by the control system 22 according to the heat transfer film material and powder removal requirements; for example, reducing the wind speed and vibration frequency for thin materials. Under the control of the control system 22, the drive motor 19 and the powder circulation conveyor belt 9 adjust their speed according to the printing speed and powder circulation requirements to ensure efficient powder circulation. When a component abnormality or malfunction is detected, the control system 22 will immediately issue an alarm and display the location and type of the fault, while automatically adjusting the operation of other components to prevent the problem from escalating.
[0035] The specific working principle is as follows: A powder circulation loop is formed by installing a powder circulation conveyor belt 9 made of wear-resistant rubber, a connecting belt 10 made of high-strength nylon, a plastic partition plate 11 heat-welded to the connecting belt 10, and a powder transfer pipe 8 with a smooth inner wall and rounded corners at the connection points. This, along with a powder feeding trough 7 and a powder return collection trough 6, achieves powder recycling, reduces powder waste, lowers production costs, increases powder utilization, and ensures smooth and unobstructed powder transport, reducing accumulation and blockage, and improving equipment stability and reliability. A control system 22, electrically connected to components such as a powder flow controller 12, a powder leakage control device 17, a laser detection sensor 18, an axial fan 20, an auxiliary vibration tube 21, a drive motor 19, and a conveyor belt drive, enables intelligent and automated control of key components. This allows for precise adjustment of operating parameters based on printing tasks, increasing equipment automation, reducing manual intervention, improving the accuracy and quality of heat transfer film printing, ensuring efficient and stable printing, and minimizing adverse effects caused by human error.
[0036] The wiring diagram of the motor in this utility model is common knowledge in the field, and its working principle is a well-known technology. The appropriate model is selected according to actual use, so the control method and wiring layout of the motor will not be explained in detail.
[0037] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A heat transfer film printing device, comprising a device housing (1), characterized in that: The equipment housing (1) is axially rotatably connected to a power transmission shaft (2). The front side of the equipment housing (1) is provided with a powder spreading module (3) and a powder release chamber (4). The powder spreading module (3) is provided with a funnel-shaped powder receiving cavity (5). The powder release chamber (4) is provided with a return powder collection trough (6) below it. The powder receiving cavity (5) is provided with a powder conveying trough (7) below it. The left and right ends of the front side of the equipment housing (1) are provided with powder transmission pipes (8) that connect the powder conveying trough (7) and the return powder collection trough (6). Powder circulation conveyor belts (9) are installed in the powder transmission pipes (8), the powder conveying trough (7) and the return powder collection trough (6). A connecting belt (10) is provided in the middle of the powder circulation conveyor belt (9). A partition plate (11) is provided at intervals on the connecting belt (10). The powder circulation conveyor belt (9) makes the powder conveying trough (7), the powder transmission pipe (8) and the return powder collection trough (6) form a powder circulation loop.
2. The heat transfer film printing device according to claim 1, characterized in that: Several powder flow controllers (12) are fastened to the bottom of the powder conveying trough (7) by bolts. The powder flow controllers (12) are used to precisely control the powder flow rate. A powder nozzle (13) is fastened to the bottom of the powder flow controllers (12) by welding. The powder conveying trough (7) is located directly below the powder loading block (14).
3. The heat transfer film printing device according to claim 1, characterized in that: The powder spreading module (3) is fixed to the front side of the equipment housing (1) by bolt connection. The top of the powder spreading module (3) is hinged to a door panel (15) by a hinge (16). A powder loading block (14) is welded inside the powder receiving cavity (5). The powder loading block (14) is made of wear-resistant engineering plastic and its surface is polished.
4. The heat transfer film printing device according to claim 3, characterized in that: A powder leakage control device (17) is installed below the powder loading block (14) by a snap-fit method, and a laser detection sensor (18) is installed on the left side of the powder loading block (14) by a fastening method.
5. The heat transfer film printing device according to claim 1, characterized in that: A drive motor (19) is fastened to the left side of the equipment housing (1) by bolts. The powder transfer pipe (8) on the left side passes through the drive motor (19) and is powered by it to drive the powder circulation conveyor belt (9) to operate.
6. The heat transfer film printing device according to claim 1, characterized in that: An axial fan (20) is bolted to the rear side of the powder release chamber (4), and an auxiliary vibration tube (21) is rotatably connected to the front side of the powder release chamber (4) via a bearing. The auxiliary vibration tube (21) is driven by a drive motor (19).
7. The heat transfer film printing device according to claim 1, characterized in that: The inner wall of the powder transfer pipe (8) is smooth, and the connection with the powder conveying trough (7) and the return powder collection trough (6) is rounded. The powder circulation conveyor belt (9) is made of wear-resistant rubber, the connecting belt (10) is made of high-strength nylon, the partition plate (11) is made of plastic and is hot-melt welded to the connecting belt (10). The partition plate (11) is 10 mm high and 110 mm apart.
8. The heat transfer film printing device according to claim 1, characterized in that: The equipment housing (1) is equipped with a control system (22), which is electrically connected to a powder flow controller (12) for regulating the powder flow rate in the powder conveying trough (7), a powder leakage control device (17) located below the powder loading block (14) to control powder leakage, a laser detection sensor (18) installed on the left side of the powder loading block (14) for monitoring the powder condition, an axial flow fan (20) installed on the rear side of the powder removal chamber (4), an auxiliary vibration tube (21) located on the front side of the powder removal chamber (4), a drive motor (19) that provides power to the left powder transmission pipe (8), and a drive device that drives the powder circulation conveyor belt (9) to operate.