A drying device for thermal spraying powder

Abstract

The present invention discloses a drying device for thermal spraying powder, comprising: an outer shell, which is composed of an upper cover and a lower box body spliced ​​together from top to bottom; a feed port is provided at the top of one end of the upper cover, and a plurality of air outlets are equidistantly provided in the middle area of ​​the top of the upper cover, a hollow hemispherical filter membrane is installed in each air outlet, and an exhaust pipe is installed on the top of the air outlet; a discharge port is provided at the bottom of the other end of the lower box body, a vibration motor is installed on both sides of the lower box body, and a hot air duct is also connected to the bottom position of the rear surface of the lower box body; in the present invention, wet air containing powder is filtered by a filter membrane, and the filtered thermal spraying powder is scraped off in conjunction with a cleaning component, and falls into a vibrating fluidized bed for further drying treatment, so as to ensure that the discharged wet air no longer contains thermal spraying powder, thereby eliminating a series of external separation and drying equipment, reducing the preparation cost of the whole set of equipment, being more conducive to the use and promotion of micro and small enterprises, and simple to maintain.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal spraying powder drying, and in particular relates to a drying device for thermal spraying powder. Background Art

[0002] Metals, alloys and composite powders commonly used in thermal spray hardfacing technology. Thermal spraying (welding) methods such as oxygen-acetylene flame, plasma flame or oxygen-acetylene explosion flame are used to heat these unique powders instantly, and in a molten or semi-molten state, they are sprayed and deposited on the surface of a cold or hot workpiece with a high-speed heat flow to form a surface strengthening layer, so as to achieve the purpose of improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance or repairing the external dimensions of the workpiece surface. Some metal or ceramic-based materials usually absorb moisture or contain a certain amount of moisture during the manufacturing and storage process; if the powder contains moisture, the moisture will evaporate rapidly during spraying, which may produce bubbles, cracks or uneven coatings, affecting the quality and adhesion of the coating, and the powder may agglomerate in a humid environment, resulting in adhesion between the powder particles. This agglomeration will affect the fluidity and distribution uniformity during spraying and reduce the spraying effect. Therefore, it is necessary to dry before spraying to keep the looseness of the powder, and some powder materials may react with water to produce adverse reactions such as oxidation and hydrogenation, resulting in a decrease in powder performance. Therefore, drying treatment helps to maintain the chemical stability of the powder.

[0003] At present, the main drying equipment for thermal spray powder is a vibrating fluidized bed, which realizes powder fluidization drying by connecting hot air and vibrating, and is equipped with a suction duct to discharge the wet air mixed with powder generated during drying. In order to achieve the recovery of thermal spray powder, a complete set of cyclone separators, bag dust collectors, induced draft fans and other equipment are also equipped in addition to the vibrating fluidized bed to achieve the recovery and treatment of the thermal spray powder sucked out during drying. However, this set of drying equipment occupies a large area and has high cost, so it cannot be promoted in micro and small enterprises, and the secondary separation method cannot achieve one-time discharge. The separated thermal spray powder needs to be collected and processed in a unified manner in the later stage, resulting in low work efficiency, so there is room for improvement. Summary of the invention

[0004] The purpose of the present invention is to provide a drying device for thermal spraying powder to solve the problems mentioned in the above background technology that the existing drying devices have many equipments, high manufacturing costs, are not conducive to the use of small enterprises, and cannot achieve one-time discharge.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a drying device for thermal spraying powder, comprising: an outer shell, which is composed of an upper cover and a lower box body spliced ​​together from top to bottom; a feed inlet is provided at the top of one end of the upper cover, and a plurality of air outlets are equidistantly provided in the middle area of ​​the top of the upper cover, and a hollow hemispherical filter membrane is installed in each air outlet. In actual use, the installation can be achieved by bonding; and an exhaust pipe is installed on the top of the air outlet; a discharge port is provided at the bottom of the other end of the lower box body, and a vibration motor is installed on both sides of the lower box body, and a hot air duct is also connected to the bottom position of the rear surface of the lower box body, and hot air is injected into the lower box body through the hot air duct to achieve drying treatment of the thermal spraying powder, and a perforated auxiliary plate is placed on the top of the lower box body, and the perforated auxiliary plate is tightened by the bottom end of the upper cover; a circulating drying mechanism is provided in the upper cover, and the circulating drying mechanism comprises: a driving component, which is placed on the upper cover; a transmission component, whose top area is connected to the driving The assembly is connected by transmission, and the bottom area passes through the upper cover, and the transmission assembly as a whole is between the discharge port and the adjacent air outlet; a material guide assembly is arranged in the upper cover, and the material guide assembly includes a mounting rod fixed at both ends to the inner wall of the upper cover, and a material guide plate sleeved on the mounting rod and rotating around the axis of the mounting rod, the top of the material guide plate is rotatably connected to the bottom of the transmission assembly, and when the transmission assembly descends, it rotates from an initial vertical state to an inclined state, and the material guide plate in the inclined state is located below the air outlet adjacent to the discharge port, and can guide the thermal spray powder scraped off from the position closest to the discharge port toward the direction of the feed port, so that the thermal spray powder falling from the material guide plate can be away from the discharge port, thereby increasing the drying time; a cleaning assembly has a cleaning portion and a connecting gear, wherein the cleaning portion sweeps the entire inner wall area of ​​the filter membrane by rotation, and the connecting gear is installed at the end position of the cleaning portion and meshed with the middle and upper area of ​​the transmission assembly.

[0006] As a preferred technical solution in the present invention, the transmission assembly includes a vertical rod and a connecting rod which is initially horizontal; a notch is provided at the top of the guide plate, and a shaft which movably passes through one end of the connecting rod is fixed in the notch, and a connecting column which movably passes through the other end of the connecting rod is fixed at the bottom of the front surface of the vertical rod. When the vertical rod moves downward, one end of the horizontal connecting rod moves downward with the vertical rod, and the other end also drops synchronously, and drives the top of the guide plate to flip downward toward the direction of the limit rod. At this time, the guide plate as a whole rotates around the mounting rod, and changes from the initial vertical shape to an inclined shape.

[0007] As a preferred technical solution in the present invention, the cleaning part is a scraper rod, and the surface of the scraper rod is formed with arc rod parts with the same number as the air outlets. The arc rod parts are fitted with the inner wall of the filter membrane by rotation, so as to scrape off the dust filtered by the filter membrane; an integrated rack protruding outward is formed in the middle and upper area of ​​the front surface of the vertical rod, and the connecting gear is installed at the end of the arc rod part, and the connecting gear is meshed with the rack without contacting the vertical rod.

[0008] As a preferred technical solution in the present invention, the driving assembly includes a servo motor installed on the top of the other end of the upper cover, and a driving gear is installed on the output end of the servo motor. The top of the vertical rod penetrates to the outside of the upper cover, and the driving gear is meshed with the rack. When the inner wall of the filter membrane is cleaned, the servo motor drives the driving gear to rotate, thereby driving the vertical rod to descend. Since the lower area of ​​the vertical rod is not in contact with the connecting gear, the connecting gear at this time does not drive the scraper rod to rotate, and the vertical rod will press down the connecting rod, so that the connecting rod rotates the top of the guide plate toward the direction of the vertical rod and gradually tilts it. When the rack contacts the connecting gear, the guide plate has formed an inclined shape. At this time, as the vertical rod continues to move downward, the guide plate When it falls, it will drive the connecting gear to rotate, and the connecting gear will drive the entire scraper rod to rotate. When the scraper rod rotates, the thermal spray powder adhered to the inner wall of the filter membrane is scraped off, and the scraped powder will fall onto the guide plate, and then fall onto the punching auxiliary plate through the inclination of the guide plate and the vibration of the vibration motor. Since the guide plate is inclined toward the feed inlet, the thermal spray powder that falls can extend the drying time and ensure the drying quality. After the cleaning is completed, the servo motor reverses and drives the rack to rise by driving the gear. At this time, the guide plate is driven by the connecting rod that gradually tends to be horizontal, and gradually returns to the vertical state. The guide plate in the vertical state will not affect the normal extraction of humid air.

[0009] As a preferred technical solution in the present invention, a limiting rod is also fixed on the side of the connecting rod, and the limiting rod is abutted against the top inner wall of the upper cover through the rising of the transmission assembly. When the limiting rod abuts against the top inner wall of the upper cover under the rising of the transmission assembly, the connecting rod returns to a horizontal state, and the guide plate also returns to a vertical state.

[0010] As a preferred technical solution in the present invention, a counterweight block is also provided on the bottom side of the guide plate. The counterweight block is a metal component. The counterweight block can increase the downward weight of the guide plate and reduce the influence of the vibration motor on the vertical state of the counterweight block.

[0011] As a preferred technical solution in the present invention, a strip groove is also provided on the top inner wall of the upper cover, and the connecting gear is located in the strip groove, thereby providing a placement space for the connecting gear and ensuring that the scraper rod fits with the top inner wall of the upper cover, and the arc rod portion can clean the inner wall of the filter membrane by rotation, and the vertical rod penetrates the upper cover and passes through the strip groove.

[0012] As a preferred technical solution in the present invention, it also includes a protective component, which includes a magnetic block magnetically attracted in a strip groove, and a brush is bonded to the end face of the magnetic block facing the rack, and the brush is against the rack. When the vertical rod is raised or lowered, the brush will sweep away the thermal spray powder adhered to the rack and the vertical rod to prevent it from being brought to the outside of the upper cover.

[0013] As a preferred technical solution in the present invention, it is characterized in that: the scraper rod is also provided with a rod sleeve, and the rod sleeve is fixed on the top inner wall of the upper cover, and the scraper rod and the connecting gear are installed through the rod sleeve.

[0014] As a preferred technical solution in the present invention, a spring base is also installed on the bottom end surface of the lower box body, which can vibrate with the vibration of the outer shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, wet air containing powder is filtered through a filter membrane, and the filtered thermal spray powder is scraped off with a cleaning component and falls into a vibrating fluidized bed for further drying to ensure that the discharged wet air no longer contains thermal spray powder, thereby eliminating a series of external separation and drying equipment, reducing the preparation cost of the entire device, being more conducive to the use and promotion of micro-small enterprises, and simple maintenance;

[0017] 2. The material guide assembly and the cleaning assembly in the present invention operate together in front and behind, and can guide the scraped thermal spray powder toward the feed port of the vibrating fluidized bed, thereby extending the drying time of the wet thermal spray powder and ensuring the drying quality. When the material guide assembly is not in use, it is arranged in a vertical state in the vibrating fluidized bed as a whole, which will not affect the normal dehumidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a drying device for thermal spraying powder;

[0019] Figure 2 It is a rear view of a drying device for thermal spray powder;

[0020] Figure 3 for Figure 2 Schematic diagram of the structure in a cutaway state;

[0021] Figure 4 for Figure 3 Schematic diagram of the structure of the middle A area;

[0022] Figure 5 A partial schematic diagram of the end area of ​​the cleaning assembly;

[0023] Figure 6 It is a regional schematic diagram of the connection part between the upper cover and the transmission assembly;

[0024] Figure 7 for Figure 6 A magnified schematic diagram of area B.

[0025] In the figure:

[0026] 101, upper cover; 101a, feed port; 101b, strip groove; 102, lower box; 102a, discharge port; 103, vibration motor; 104, spring base; 105, exhaust pipe; 106, hot air pipe; 107, punching auxiliary plate; 108, filter membrane;

[0027] 201, servo motor; 202, driving gear;

[0028] 301, vertical rod; 301a, rack; 302, limit rod; 303, connecting rod; 304, connecting column;

[0029] 401, mounting rod; 402, guide plate; 403, counterweight block;

[0030] 501, connecting gear; 502, scraper rod; 502a, arc rod portion; 503, rod sleeve;

[0031] 601. Magnetic block; 602. Brush. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 7 The present invention provides a technical solution: a drying device for thermal spraying powder, comprising:

[0034] The outer shell is composed of an upper cover 101 and a lower box body 102 spliced ​​together from top to bottom;

[0035] A feed port 101a is provided at the top of one end of the upper cover 101, and a plurality of air outlets are equidistantly provided in the middle area of ​​the top of the upper cover 101, and a hollow hemispherical filter membrane 108 is installed in each air outlet, which can be installed by bonding in actual use; and an exhaust pipe 105 is installed on the top of the air outlet; in actual application, if the particle size of the dry thermal spraying powder is small, such as micron-level powder, the filter membrane 108 adopts a microporous membrane, which has fine pores and can filter tiny thermal spraying powders in the air. Common materials include polyester, polypropylene, polyurethane, and polyamide, which can be easily processed and installed on the device, and the pore size ranges from 0.01um to 0.2um. When the particle size of the thermal spraying powder is large or higher mechanical strength and durability are required, a synthetic fiber membrane is used. This membrane is woven by synthetic fibers. Common materials include polyester fibers, polypropylene fibers, and nylon fibers, and the pore size ranges from 0.1um to 10um;

[0036] A discharge port 102a is provided at the bottom of the other end of the lower box body 102, and vibration motors 103 are installed on both sides of the lower box body 102. A hot air duct 106 is also connected to the bottom position of the rear surface of the lower box body 102. Hot air is injected into the lower box body 102 through the hot air duct 106 to achieve drying of the thermal spraying powder. A perforated auxiliary plate 107 is placed on the top of the lower box body 102, and the perforated auxiliary plate 107 is limited by the bottom end of the upper cover 101, wherein the hot air duct 106 is lower than the horizontal plane of the perforated auxiliary plate 107, so as to ensure that the blown hot air can pass through the perforated auxiliary plate 107 and dry the thermal spraying powder on the perforated auxiliary plate 107; during the drying process, the thermal spraying powder to be dried is first fed from the inlet through a spiral feeder and other equipment The material is injected from the material port 101a and falls onto the punching auxiliary material plate 107. At the same time, the vibration motor 103 is started, and the vibration motor 103 drives the lower box body 102 to vibrate, so as to achieve the purpose of synchronously driving the upper cover 101 and the punching auxiliary material plate 107 to vibrate. At this time, the hot air injected from the rear position of the lower box body 102 blows and dries the thermal spraying powder on the punching auxiliary material plate 107. At this time, the thermal spraying powder is fluidized on the punching auxiliary material plate 107 and moves toward the direction of the material outlet 102a. At the same time, the exhaust pipe 105 discharges the wet air mixed with the thermal spraying powder. When the wet air passes through the filter membrane 108, the powder in the wet air is filtered and isolated at the inner wall position of the filter membrane 108, and the separated wet air is normally extracted;

[0037] A circulating drying mechanism is provided in the upper cover 101, and the circulating drying mechanism comprises:

[0038] A driving assembly is placed on the upper cover 101;

[0039] The transmission assembly has a top area that is in transmission connection with the driving assembly, and a bottom area that penetrates into the upper cover 101. The transmission assembly is located as a whole between the discharge port 102a and the adjacent air outlet;

[0040] The material guide assembly is arranged in the upper cover 101, and the material guide assembly includes a mounting rod 401 whose two ends are fixed to the inner wall of the upper cover 101, and a material guide plate 402 which is sleeved on the mounting rod 401 and rotates around the axis of the mounting rod 401. The top of the material guide plate 402 is rotatably connected to the bottom of the transmission assembly, and rotates from an initial vertical state to an inclined state when the transmission assembly descends. The material guide plate 402 in the inclined state is located below the air outlet adjacent to the discharge port 102a, and can guide the thermal spray powder scraped off from the position closest to the discharge port 102a toward the direction of the feed port 101a, so that the thermal spray powder dropped from the material guide plate 402 can be away from the discharge port 102a, thereby increasing the drying time;

[0041] The cleaning component has a cleaning part and a connecting gear 501, wherein the cleaning part sweeps the entire inner wall area of ​​the filter membrane 108 by rotation, and the connecting gear 501 is installed at the end position of the cleaning part and is meshed with the middle and upper area of ​​the transmission component.

[0042] In this embodiment, the transmission assembly includes a vertical rod 301 and a connecting rod 303 which is initially horizontal; a notch is provided at the top of the guide plate 402, and a shaft which movably passes through one end of the connecting rod 303 is fixed in the notch (not shown in the figure); a connecting column 304 which movably passes through the other end of the connecting rod 303 is fixed at the bottom of the front surface of the vertical rod 301; when the vertical rod 301 moves downward, one end of the horizontal connecting rod 303 moves downward with the vertical rod 301, and the other end also drops synchronously, and drives the top of the guide plate 402 to flip downward in the direction of the limit rod 302; at this time, the guide plate 402 rotates around the mounting rod 401 as a whole, and changes from the initial vertical shape to an inclined shape.

[0043] In this embodiment, the cleaning part is a scraper rod 502, and the surface of the scraper rod 502 is formed with arc rod parts 502a with the same number as the air outlets. The arc rod parts 502a are fitted with the inner wall of the filter membrane 108 by rotation, so as to scrape off the dust filtered by the filter membrane 108; an integrated rack 301a protruding outward is formed in the middle and upper area of ​​the front surface of the vertical rod 301, and a connecting gear 501 is installed at the end of the arc rod part 502a. The connecting gear 501 is meshed and connected with the rack 301a without contacting the vertical rod 301.

[0044] In this embodiment, the driving assembly includes a servo motor 201 installed on the top of the other end of the upper cover 101, and a driving gear 202 is installed on the output end of the servo motor 201. The top of the vertical rod 301 passes through the outside of the upper cover 101, and the driving gear 202 is meshed and connected with the rack 301a. When cleaning the inner wall of the filter membrane 108, the servo motor 201 drives the driving gear 202 to rotate, thereby driving the vertical rod 301 to descend. Since the lower area of ​​the vertical rod 301 is not in contact with the connecting gear 501, the connecting gear 501 at this time does not drive the scraper rod 502 to rotate, and the vertical rod 301 will press down the connecting rod 303, so that the connecting rod 303 rotates the top of the guide plate 402 toward the direction of the vertical rod 301 and gradually tilts. When the rack 301a contacts the connecting gear 501, the guide plate 402 has formed an inclined shape. At this time, the vertical rod 301 When it continues to decline, it will drive the connecting gear 501 to rotate, and the connecting gear 501 will drive the entire scraper rod 502 to rotate. When the scraper rod 502 rotates, the thermal spray powder adhered to the inner wall of the filter membrane 108 is scraped off, and the scraped powder will fall onto the guide plate 402, and then fall onto the punching auxiliary plate 107 through the inclination of the guide plate 402 and the vibration of the vibration motor 103. Since the guide plate 402 is inclined toward the direction of the feed inlet 101a, the thermal spray powder that falls can extend the drying time and ensure the drying quality. After the cleaning is completed, the servo motor 201 reverses and drives the rack 301a to rise by driving the gear 202. At this time, the guide plate 402 is driven by the connecting rod 303 that gradually tends to be horizontal, and gradually returns to the vertical state. The guide plate 402 in the vertical state will not affect the normal extraction of humid air.

[0045] In this embodiment, a limiting rod 302 is also fixed on the side of the connecting rod 303, and the limiting rod 302 is abutted against the top inner wall of the upper cover 101 through the rising of the transmission assembly. When the limiting rod 302 abuts against the top inner wall of the upper cover 101 under the rising of the transmission assembly, the connecting rod 303 returns to a horizontal state, and the guide plate 402 also returns to a vertical state.

[0046] In this embodiment, a counterweight block 403 is also provided on the bottom side of the guide plate 402. The counterweight block 403 is a metal component. The counterweight block 403 can increase the downward weight of the guide plate 402 and reduce the influence of the vibration motor 103 on the vertical state of the counterweight block 403.

[0047] In this embodiment, a strip groove 101b is further provided on the top inner wall of the upper cover 101, and the connecting gear 501 is located in the strip groove 101b, thereby providing a placement space for the connecting gear 501 and ensuring that the scraper rod 502 fits against the top inner wall of the upper cover 101, and the arc rod portion 502a can clean the inner wall of the filter membrane 108 by rotation, and the vertical rod 301 penetrates the upper cover 101 and passes through the strip groove 101b.

[0048] In this embodiment, a protective component is also included, which includes a magnetic block 601 magnetically attracted in the strip groove 101b, and a brush 602 is bonded to the end face of the magnetic block 601 facing the rack 301a. The brush 602 is against the rack 301a. When the vertical rod 301 is raised or lowered, the brush 602 will sweep away the thermal spray powder adhered to the rack 301a and the vertical rod 301 to prevent it from being brought to the outside of the upper cover 101.

[0049] In this embodiment, a rod sleeve 503 is further sleeved on the scraper rod 502 . The rod sleeve 503 is fixed on the top inner wall of the upper cover 101 . The scraper rod 502 and the connecting gear 501 are installed through the rod sleeve 503 .

[0050] In this embodiment, a spring base 104 is also installed on the bottom end surface of the lower box body 102, which can vibrate along with the vibration of the outer shell.

[0051] Although embodiments of the present invention have been shown and described (see the above detailed description for details), it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drying device for thermal spraying powder, comprising: The outer shell is composed of an upper cover (101) and a lower box body (102) spliced ​​together from top to bottom; Features: A feed port (101a) is provided at the top of one end of the upper cover (101), and a plurality of air outlets are equidistantly provided in the middle area of ​​the top of the upper cover (101), and a hollow hemispherical filter membrane (108) is installed in each air outlet; and an exhaust pipe (105) is installed at the top of the air outlet; A discharge port (102a) is provided at the bottom of the other end of the lower box body (102), vibration motors (103) are installed on both sides of the lower box body (102), a hot air duct (106) is also connected to the bottom of the rear surface of the lower box body (102), and a punching auxiliary plate (107) is placed on the top of the lower box body (102), and the punching auxiliary plate (107) is tightly pressed by the bottom end of the upper cover (101); A circulating drying mechanism is provided in the upper cover (101), and the circulating drying mechanism comprises: A driving assembly is disposed on the upper cover (101); A transmission assembly, the top region of which is in transmission connection with the drive assembly, and the bottom region of which penetrates into the upper cover (101), the transmission assembly as a whole being located between the discharge port (102a) and the adjacent air outlet; A material guide assembly is arranged in the upper cover (101), the material guide assembly comprises a mounting rod (401) with both ends fixed to the inner wall of the upper cover (101), and a material guide plate (402) sleeved on the mounting rod (401) and rotating around the axis of the mounting rod (401), the top of the material guide plate (402) being rotationally connected to the bottom of the transmission assembly, and rotating from an initial vertical state to an inclined state when the transmission assembly descends, and the material guide plate (402) in the inclined state is located below the air outlet adjacent to the material outlet (102a); The cleaning component comprises a cleaning portion and a connecting gear (501), wherein the cleaning portion sweeps the entire inner wall area of ​​the filter membrane (108) by rotation, and the connecting gear (501) is installed at the end position of the cleaning portion and meshes with the middle and upper area of ​​the transmission component.

2. A drying device for thermal spraying powder according to claim 1, characterized in that: The transmission assembly comprises a vertical rod (301) and a connecting rod (303) which is initially horizontal; a notch is formed at the top of the guide plate (402), and a shaft which movably passes through one end of the connecting rod (303) is fixed in the notch; a connecting column (304) which movably passes through the other end of the connecting rod (303) is fixed at the bottom of the front surface of the vertical rod (301).

3. A drying device for thermal spraying powder according to claim 2, characterized in that: The cleaning portion is a scraper rod (502), the surface of the scraper rod (502) being formed with arc rod portions (502a) having the same number as the air outlets, the arc rod portions (502a) being fitted with the inner wall of the filter membrane (108) by rotation; an integrated rack (301a) protruding outward is formed in the middle upper area of ​​the front surface of the vertical rod (301), the connecting gear (501) being mounted on the end of the arc rod portion (502a), the connecting gear (501) being meshedly connected with the rack (301a) without contacting the vertical rod (301).

4. A drying device for thermal spraying powder according to claim 3, characterized in that: The driving assembly comprises a servo motor (201) mounted on the top of the other end of the upper cover (101), a driving gear (202) being mounted on the output end of the servo motor (201), the top of the vertical rod (301) passing through the outside of the upper cover (101), and the driving gear (202) being meshedly connected with a rack (301a).

5. A drying device for thermal spraying powder according to claim 4, characterized in that: A limiting rod (302) is also fixed on the side of the connecting rod (303), and the limiting rod (302) abuts against the top inner wall of the upper cover (101) through the rise of the transmission assembly.

6. A drying device for thermal spraying powder according to claim 4, characterized in that: A counterweight block (403) is also provided on the bottom side of the guide plate (402), and the counterweight block (403) is a metal component.

7. A drying device for thermal spraying powder according to claim 4, characterized in that: A strip groove (101b) is also provided on the top inner wall of the upper cover (101), the connecting gear (501) is located in the strip groove (101b), and the vertical rod (301) penetrates the upper cover (101) and passes through the strip groove (101b).

8. A drying device for thermal spraying powder according to claim 7, characterized in that: It also comprises a protection component, which comprises a magnetic block (601) magnetically attracted in the strip-shaped groove (101b), a brush (602) being bonded to the end surface of the magnetic block (601) facing the rack (301a), and the brush (602) abuts against the rack (301a).

9. A drying device for thermal spraying powder according to claim 3, characterized in that: The scraping rod (502) is also sleeved with a rod sleeve (503), and the rod sleeve (503) is fixed on the top inner wall of the upper cover (101).

10. The drying device for thermal spraying powder according to claim 1, characterized in that: A spring base (104) is also installed on the bottom end surface of the lower box body (102).

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