A powder spreading machine

Abstract

A powder spreading machine includes a frame, and the frame is provided with a storage mechanism, a control mechanism and a powder spreading mechanism in order from top to bottom; the storage mechanism includes a hopper with a discharge port at the bottom; the control mechanism includes a plurality of valves sealed at the discharge port and a plurality of control components for controlling the opening / closing of any of the valves; the powder spreading mechanism includes a rotating shaft axially connected to the frame and a plurality of powder spreading units arranged on the rotating shaft, at least one powder spreading unit is longitudinally aligned with any of the valves, and any of the powder spreading units is provided with a plurality of powder spreading holes. The powder is spread in the air to form dust mist, and the dust mist-like powder falls on the surface of the carrier to achieve a uniform spreading effect. When the powder spreading process is carried out in this way, the powder spread on the surface of the carrier is stacked layer by layer to become thicker, which can meet the powder spreading requirement of extremely small powder thickness, and the powder thickness can also be controlled according to time.

Description

Technical Field

[0001] The invention belongs to the field of powder spreading devices, and in particular relates to a powder spreading machine. Background Art

[0002] A powder spreader is a mechanical device that evenly distributes powdered materials. It is widely used in aquaculture, powdered material manufacturing and other fields. The uniformity of the powder spreader is an important criterion for measuring its performance.

[0003] Existing powder spreading machines generally include a hopper, a feeding mechanism and a powder spreading hole; the hopper feeds materials to the feeding mechanism, which is generally a long strip structure with a built-in feeding roller, which pushes the powder from one end of the feeding to the other end until the bottom of the long strip feeding mechanism is evenly filled with powder. The powder spreading hole at the bottom of the feeding mechanism is opened, and the powder falls from the powder spreading hole to realize the powder spreading function.

[0004] The powder dropped from the powder sprinkling hole of the above-mentioned powder sprinkling machine will form a powder column like a water flow. When the powder column contacts the surface of the carrier containing the powder, it will accumulate in one place. The carrier needs to be moved continuously to realize the spreading of the powder. Since the single-point spreading amount is too large, if a thin layer of powder needs to be spread on the surface of the carrier, the above-mentioned powder sprinkling machine will not be able to cope with it. Summary of the invention

[0005] The purpose of the present invention is that powder is stored by a storage mechanism, and whether to supply powder is controlled by a control mechanism. When a valve is opened, the powder falls freely, and a powder spreading unit of the powder spreading mechanism is arranged on the path of the free fall of the powder. The powder spreading unit scoops up the falling powder through the rotation of the rotating shaft. Due to inertia and the effect of rotational centrifugation, the powder spreads to all sides along the powder spreading holes opened on the powder spreading unit, and finally falls on the surface of the carrier, thereby achieving the effect of uniform dispersion and trace powder spreading.

[0006] The present invention is achieved through the following technical solutions:

[0007] A powder spreading machine comprises a frame, wherein the frame is provided with a material storage mechanism, a control mechanism and a powder spreading mechanism in sequence from top to bottom; the material storage mechanism comprises a hopper with a material discharge port at the bottom; the control mechanism comprises a plurality of valves sealed at the material discharge port and a plurality of control components for controlling the opening / closing of any of the valves; the powder spreading mechanism comprises a rotating shaft axially connected to the frame and a plurality of powder spreading units arranged on the rotating shaft, at least one powder spreading unit is longitudinally aligned with any of the valves, and any of the powder spreading units is provided with a plurality of powder spreading holes.

[0008] Through the above scheme, the present invention at least obtains the following technical effects: the powder is stored in the hopper, and the discharge port at the bottom of the hopper is blocked by the closed valve. When sprinkling powder, the control component controls the valve to open, so that the powder in the hopper falls freely from the discharge port. On the path of the powder falling, the rotating shaft drives the powder sprinkling unit to rotate. When the powder sprinkling unit passes the powder falling place, it scoops up the powder and enters the powder sprinkling unit. Since the powder has the inertia of falling, and the powder enters the powder sprinkling unit and is driven by the powder sprinkling unit to rotate and produce centrifugal effect, the powder will flow out of the powder sprinkling unit along the powder sprinkling hole opened on the powder sprinkling unit, and be scattered in the air to form dust mist. When the dust mist powder falls on the surface of the carrier, the effect of uniform spreading is achieved. When it is necessary to stop sprinkling powder, the control component controls the valve to close and stop sprinkling powder. And when the powder sprinkling process is carried out in this way, the powder scattered on the surface of the carrier is stacked layer by layer and becomes thicker, which can meet the powder sprinkling requirement of extremely small powder thickness, and the powder thickness can also be controlled according to time.

[0009] Preferably, any of the powder sprinkling units comprises a mounting base detachably mounted on the rotating shaft and a wall panel group mounted on the mounting base; the wall panel group comprises a rectangular wall panel and two fan-shaped wall panels arranged along the axial direction of the rotating shaft, the three wall panels are connected end to end and form a box body with an open structure on one side with the mounting base; the three wall panels are respectively provided with a plurality of powder sprinkling holes.

[0010] Each powder spreading unit is a triangular prism-shaped open box body. Several triangular prism-shaped boxes are closely arranged and installed on the shaft of the rotating shaft. As the rotating shaft rotates, different powder spreading units pass through the falling area of ​​the powder in turn to pick up the powder. The falling powder enters the box body from the opening of the open structure box body. Due to the inertia and centrifugal force, the powder moves in the direction of the side wall surrounded by the three wall panels, and is thrown out of the box body through several powder spreading holes on the three wall panels to achieve a spreading effect.

[0011] Preferably, the projection of any of the powder spreading units on a plane perpendicular to the central axis of the rotating shaft is fan-shaped.

[0012] The shaft needs to maintain rotational balance during rotation to avoid the risk of deformation or even breakage. To maintain the rotational balance of the shaft, the outer contour of the powder spreading unit installed on the shaft needs to be trimmed so that the distance from the point farthest from the axis of the shaft to the axis of the shaft is equal. Therefore, the projection of any powder spreading unit on a plane perpendicular to the axis of the shaft is a fan shape.

[0013] Preferably, any one of the valves comprises a valve body fixedly arranged at the bottom of the hopper and a door body slidably connected to the valve body; the valve body is provided with a first discharge groove connected to the discharge port; the door body is provided with a second discharge groove, and the second discharge groove is connected to the first discharge groove.

[0014] The valve body cooperates with the door body to realize the opening or closing effect of the valve. By moving the position of the door body, the second discharge slot is connected to the first discharge slot, forming a channel connecting the inside and outside of the hopper. The hopper passes through the discharge port of the hopper, the first discharge slot and the second discharge slot in sequence and falls to the powder spreading mechanism, realizing the effect of opening the valve to discharge. By moving the position of the door body, the second discharge slot is staggered with the first discharge slot, and the connection relationship between the first discharge slot and the second discharge slot is disconnected, so that the powder in the hopper cannot fall out, realizing the effect of closing the valve.

[0015] Preferably, any of the valve bodies is further provided with a slide groove, the slide groove is communicated with the first discharge channel, and the door body is arranged in the slide groove.

[0016] The door body is slidably arranged in the slide groove provided in the valve body, so as to limit the position of the door body and avoid leakage of powder from the gap between the door body and the valve body. At the same time, the door body can only slide telescopically along the extension direction of the slide groove, so that the movement position of the door body is more accurate, and the diameter of the connection between the first discharge channel and the second discharge channel can be controlled by controlling the movement of the door body, so as to achieve the purpose of controlling the discharge amount.

[0017] Preferably, any of the control components includes a telescopic component fixedly mounted on the frame, the telescopic end of the telescopic component being connected to the door body; and also includes an elastic component; one end of the elastic component is fixedly connected to the door body, and the other end is fixedly connected to the valve body.

[0018] Since the door body is set in the slide groove and can only slide telescopically along the extension direction of the slide groove, the driving device of the door body uses a telescopic component with a simple structure and easy to control. The telescopic component is controlled to drive the door body to slide telescopically in the slide groove. In this scheme, the elastic component adopts a spring structure for resetting the door body. That is, when the telescopic component drives the door body to move to the position where the first discharge slot is connected to the second discharge slot, the spring is in a state of tension or contraction; when the telescopic component stops applying force to the door body, the spring drives the door body to reset, disconnects the connection between the first discharge slot and the second discharge slot, and closes the valve. At the same time, the elastic component also has the function of providing a buffering effect to prevent the door body from colliding with the valve body and being damaged.

[0019] Preferably, any of the control mechanisms also includes a limit assembly, which includes a limit slide rail arranged on the valve body and a limit mounting plate slidably arranged on the limit slide rail; the length direction of the limit slide rail is the same as the telescopic direction of the telescopic component, the limit mounting plate is fixedly connected to the door body, and the limit mounting plate is fixedly connected to one end of the elastic assembly.

[0020] The sliding cooperation between the limit rail and the limit mounting plate is used to further limit the direction in which the telescopic component drives the door to move, avoiding the situation in which the force is offset during the process of the telescopic component driving the door to move. At the same time, as a connecting medium between the door and the elastic component, the elastic component drives the door to move by pushing or pulling the limit mounting plate.

[0021] Preferably, the limiting mounting plate is provided with a groove, and the limiting slide rail is embedded in the groove.

[0022] The limit installation plate is sleeved on the limit slide rail through the groove, so that the limit installation plate can slide along the limit slide rail.

[0023] Preferably, the telescopic component is a telescopic cylinder, and the frame is also equipped with a plurality of air supply pipes for providing air pressure to any telescopic cylinder.

[0024] Alternative options for the telescopic component include telescopic cylinders, hydraulic cylinders, screws and other structures. The telescopic cylinder is selected in this scheme because the telescopic cylinder is telescopic by adjusting the air pressure, and its telescopic sensitivity is better than that of hydraulic cylinders and screws. It can more accurately control the movement of the door body and accurately control the diameter of the connection between the first discharging slot and the second discharging slot, thereby accurately controlling the discharge amount.

[0025] Preferably, a feed roller is provided in the hopper, and the end of the feed roller passes through the hopper and is connected to the frame shaft; the feed roller is arranged close to the discharge port, and a gap through which powder can pass is formed between the side wall of the feed roller and the inner wall of the hopper.

[0026] In this solution, the hopper is designed to be long and strip-shaped, and a feed roller is set in the hopper. The rolling of the feed roller drives the powder to move in the hopper, so that the powder in the hopper can be evenly distributed. At the same time, there is only a gap between the feed roller and the side wall at the discharge port to allow the powder to pass through, which can play a screening effect. At the same time, if the powder condenses into blocks in the hopper due to moisture or other reasons, it can be crushed by rolling the feed roller, so that the block powder is crushed into powder again, and falls into the discharge port through the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a powder spreading machine provided in one embodiment of the present invention.

[0028] Figure 2 The figure is a schematic side view of the structure of a powder spreading machine provided in one embodiment of the present invention.

[0029] Figure 3 The figure is a schematic diagram of the structure of a powder spreading machine provided in one embodiment of the present invention when viewed from above.

[0030] Figure 4The figure is a schematic diagram of the structure of a powder spreading unit provided in one embodiment of the present invention.

[0031] Figure 5 The figure is a schematic diagram of the combined structure of a hopper and a valve provided in one embodiment of the present invention.

[0032] Figure 6 It is a partial enlarged structural schematic diagram of the limiting mechanism provided in one embodiment of the present invention.

[0033] Figure 7 The figure is a schematic diagram of a cross-sectional structure of a valve in an open state provided in one embodiment of the present invention.

[0034] Figure 8 The figure is a schematic diagram of a cross-sectional structure of a valve in a closed state provided in one embodiment of the present invention.

[0035] legend:

[0036] 1. Frame; 2. Material storage mechanism; 3. Control mechanism; 4. Powder spreading mechanism;

[0037] 21 hopper;

[0038] 31 valve; 32 control component; 33 limit component;

[0039] 41 rotating shaft; 42 powder spreading unit;

[0040] 211 material outlet; 212 material feeding roller shaft;

[0041] 311 valve body; 312 door body;

[0042] 321 telescopic component; 322 elastic component; 323 air supply pipeline;

[0043] 331 limit slide rail; 332 limit mounting plate;

[0044] 421 powder sprinkling hole; 422 mounting base; 423 rectangular wall panel; 424 fan-shaped wall panel;

[0045] 3111 first discharging channel; 3112 chute;

[0046] 3121 second discharging channel;

[0047] 3321 grooves. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] See also Figure 1-Figure 8 .

[0050] Embodiment 1:

[0051] A powder spreading machine comprises a frame 1, wherein the frame 1 is provided with a storage mechanism 2, a control mechanism 3 and a powder spreading mechanism 4 in sequence from top to bottom; the storage mechanism 2 comprises a hopper 21 with a discharge port 211 at the bottom; the control mechanism 3 comprises a plurality of valves 31 sealed at the discharge port 211 and a plurality of control components 32 for controlling the opening / closing of any of the valves 31; the powder spreading mechanism 4 comprises a rotating shaft 41 axially connected to the frame 1 and a plurality of powder spreading units 42 arranged on the rotating shaft 41, at least one powder spreading unit 42 is longitudinally aligned with any of the valves 31, and any of the powder spreading units 42 is provided with a plurality of powder spreading holes 421.

[0052] The powder is stored in the hopper 21, and the discharge port 211 at the bottom of the hopper 21 is blocked by the closed valve 31. When spreading the powder, the control component 32 controls the valve 31 to open, so that the powder in the hopper 21 falls freely from the discharge port 211. On the falling path of the powder, the rotating shaft 41 drives the powder spreading unit 42 to rotate. When the powder spreading unit 42 passes the falling place of the powder, it scoops up the powder and enters the powder spreading unit 42. Since the powder has the inertia of falling, and after the powder enters the powder spreading unit 42, it is driven by the powder spreading unit 42 to rotate and produce centrifugal effect, so the powder will flow out of the powder spreading unit 42 along the powder spreading hole 421 opened on the powder spreading unit 42, and be scattered in the air to form dust mist. When the dust mist powder falls on the surface of the carrier, the effect of uniform dispersion is achieved. When it is necessary to stop spreading the powder, the control component 32 controls the valve 31 to close and stop spreading the powder. When the powder spreading process is carried out in this way, the powder spread on the surface of the carrier becomes thicker layer by layer, which can meet the powder spreading requirement of extremely small powder thickness, and the powder thickness can also be controlled according to time.

[0053] Embodiment 2:

[0054] Based on Example 1, the technical solution was improved as follows:

[0055] In one embodiment, to achieve the effect of scattering powder, any of the powder-scattering units 42 includes a mounting base 422 detachably mounted on the rotating shaft 41 and a wall panel group mounted on the mounting base 422; the wall panel group includes a rectangular wall panel 423 and two fan-shaped wall panels 424 arranged along the axial direction of the rotating shaft 41, and the three wall panels are connected end to end to form a box body with an open structure on one side; the powder-scattering holes 421 are respectively opened on the three wall panels. Each powder-scattering unit 42 is a triangular prism-shaped open box body, and a plurality of triangular prism-shaped box bodies are closely arranged and mounted on the shaft body of the rotating shaft 41. As the rotating shaft 41 rotates, different powder-scattering units 42 pass through the area where the powder falls in turn to pick up the powder. The falling powder enters the box body from the opening of the box body with an open structure. Due to the action of inertia and centrifugal force, the powder moves in the direction of the side wall surrounded by the three wall panels, and is thrown out of the box body through the plurality of powder-scattering holes 421 on the three wall panels to achieve the scattering effect.

[0056] In one embodiment, in order to maintain the rotational balance of the rotating shaft 41, the projection of any of the powdering units 42 on a plane perpendicular to the central axis of the rotating shaft 41 is fan-shaped. The rotating shaft 41 needs to maintain rotational balance during rotation to avoid the risk of deformation or even breakage of the rotating shaft 41. In order to maintain the rotational balance of the rotating shaft 41, the outer contour of the powdering unit 42 installed on the rotating shaft 41 needs to be trimmed so that the distance from the point farthest from the central axis of the rotating shaft 41 in any powdering unit 42 to the central axis of the rotating shaft 41 is equal. Therefore, the projection of any powdering unit 42 on a plane perpendicular to the central axis of the rotating shaft 41 is fan-shaped.

[0057] Embodiment 3:

[0058] Based on Example 1 or Example 2, the technical solution is improved as follows:

[0059] In one embodiment, in order to achieve the effect of controlling the discharge of materials through the valve 31, any of the valves 31 includes a valve body 311 fixedly arranged at the bottom of the hopper 21 and a door body 312 slidably connected to the valve body 311; the valve body 311 is provided with a first discharge slot 3111 connected to the discharge port 211; the door body 312 is provided with a second discharge slot 3121, and the second discharge slot 3121 is connected to the first discharge slot 3111. The valve body 311 and the door body 312 cooperate to achieve the opening or closing effect of the valve 31. By moving the position of the door body 312, the second discharge slot 3121 is connected to the first discharge slot 3111, forming a channel connecting the inside and outside of the hopper 21, and the hopper 21 sequentially passes through the discharge port 211, the first discharge slot 3111 and the second discharge slot 3121 of the hopper 21 and falls to the powder spreading mechanism 4, achieving the effect of opening the valve 31 to discharge materials. By moving the position of the door body 312, the second discharge slot 3121 is offset from the first discharge slot 3111, and the communication relationship between the first discharge slot 3111 and the second discharge slot 3121 is disconnected, so that the powder in the hopper 21 cannot fall out, achieving the effect of closing the valve 31.

[0060] In one embodiment, in order to prevent the powder from leaking due to a gap between the door body 312 and the valve body 311, any of the valve bodies 311 is further provided with a chute 3112, the chute 3112 is connected to the first discharge channel 3111, and the door body 312 is arranged in the chute 3112. The door body 312 is slidably arranged in the chute 3112 arranged in the valve body 311, so as to limit the position of the door body 312 and prevent the powder from leaking due to a gap between the door body 312 and the valve body 311. At the same time, the door body 312 can only slide telescopically along the extension direction of the chute 3112, so that the moving position of the door body 312 is more accurate, and the caliber of the connection between the first discharge channel 3111 and the second discharge channel 3121 can be controlled by controlling the movement of the door body 312, thereby achieving the purpose of controlling the discharge amount.

[0061] In one embodiment, in order to realize the controlled opening and resetting of the valve 31 and avoid collision damage, any of the control components 32 includes a telescopic component 321 fixedly arranged on the frame 1, and the telescopic end of the telescopic component 321 is connected to the door body 312; and also includes an elastic component 322; one end of the elastic component 322 is fixedly connected to the door body 312, and the other end is fixedly connected to the valve body 311. Since the door body 312 is arranged in the slide groove 3112 and can only be telescopically slid along the extension direction of the slide groove 3112, the driving device of the door body 312 selects a telescopic component 321 with a simple structure and easy control. The telescopic movement of the telescopic component 321 is controlled to drive the door body 312 to telescopically slide in the slide groove 3112. In this solution, the elastic component 322 adopts a spring structure for resetting the door body 312. That is, when the telescopic component 321 drives the door body 312 to move to the position where the first discharge slot 3111 and the second discharge slot 3121 are connected, the spring is in a state of tension or contraction; when the telescopic component 321 stops exerting force on the door body 312, the spring drives the door body 312 to reset, disconnecting the first discharge slot 3111 and the second discharge slot 3121, so that the valve 31 is closed. At the same time, the elastic component 322 also has the function of providing a buffering effect to prevent the door body 312 and the valve body 311 from colliding and being damaged.

[0062] In one embodiment, in order to further optimize the connection mode between the elastic component 322 and the door body 312 and optimize the limiting structure of the door body 312, any of the control mechanisms 3 further includes a limiting component 33, the limiting component 33 includes a limiting slide rail 331 provided on the valve body 311 and a limiting mounting plate 332 slidably provided on the limiting slide rail 331; the length direction of the limiting slide rail 331 is the same as the telescopic direction of the telescopic component 321, the limiting mounting plate 332 is fixedly connected to the door body 312, and the limiting mounting plate 332 is fixedly connected to one end of the elastic component 322. The sliding cooperation between the limiting slide rail 331 and the limiting mounting plate 332 is used to further limit the direction in which the telescopic component 321 drives the door body 312 to move, so as to avoid the situation in which the force is offset during the process in which the telescopic component 321 drives the door body 312 to move. At the same time, as a connecting medium between the door body 312 and the elastic component 322 , the elastic component 322 drives the door body 312 to move by pushing or pulling the limiting mounting plate 332 .

[0063] In one embodiment, in order to enable a plurality of control components 33 to achieve synchronous control of a plurality of valves 31 , the limit mounting plates 332 in each limit component 33 are interconnected or integrally formed.

[0064] In one embodiment, in order to further improve the cooperation between the limiting mounting plate 332 and the limiting slide rail 331, the limiting mounting plate 332 is provided with a groove 3321. The limiting slide rail 331 is embedded in the groove 3321, and the limiting mounting plate 332 is sleeved on the limiting slide rail 331 through the groove 3321, so as to achieve the sliding effect of the limiting mounting plate 332 along the limiting slide rail 331.

[0065] In one embodiment, in order to more accurately control the valve 31 and realize accurate control of the discharge amount, the telescopic component 321 is a telescopic cylinder, and the frame 1 is also equipped with a plurality of air supply pipes 323 for providing air pressure to any telescopic cylinder. Alternative solutions for the telescopic component 321 include structures such as a telescopic cylinder, a hydraulic cylinder, and a screw. The telescopic cylinder is selected in this solution because the telescopic cylinder is telescopic by adjusting the air pressure, and its telescopic sensitivity is better than that of a hydraulic cylinder and a screw, and it can more accurately control the movement of the door body 312, and accurately control the diameter of the connection between the first discharge slot 3111 and the second discharge slot 3121, thereby accurately controlling the discharge amount.

[0066] Embodiment 4:

[0067] Based on Example 1, Example 2 or Example 3, the technical solution is improved as follows:

[0068] In one embodiment, in order to achieve uniform distribution of powder in the hopper 21 and screen out block materials for crushing, a feed roller 212 is provided in the hopper 21, and the end of the feed roller 212 passes through the hopper 21 and is axially connected to the frame 1; the feed roller 212 is provided close to the discharge port 211, and a gap through which powder can pass is formed between the side wall of the feed roller 212 and the inner side wall of the hopper 21. In this solution, the hopper 21 is designed as a long strip structure, and a feed roller 212 is provided in the hopper 21. The powder is driven to move in the hopper 21 by the rolling of the feed roller 212, so that the powder in the hopper 21 can be evenly distributed. At the same time, only a gap is left between the feed roller 212 and the side wall at the discharge port 211 to allow the powder to pass, which can achieve a screening effect. Meanwhile, if the powder material is condensed into blocks due to moisture or other reasons in the hopper 21 , it can be crushed by rolling of the feeding roller 212 , so that the block powder material is crushed into powdery powder material again and falls into the discharge port 211 through the gap.

[0069] In the above embodiments, the rotating shaft 41 and the feeding roller shaft 212 are each equipped with a servo motor for driving, and the air supply pipeline 323 is connected to an air pump or an external air supply source.

[0070] The various technical features in the above implementation modes can be combined arbitrarily as long as there is no conflict or contradiction between the combinations of features. However, due to space limitations, they are not described one by one.

[0071] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications of the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A powder spreading machine, characterized in that: The invention comprises a frame, wherein the frame is provided with a material storage mechanism, a control mechanism and a powder spreading mechanism in order from top to bottom; the material storage mechanism comprises a material hopper with a material discharge port at the bottom; the control mechanism comprises a plurality of valves sealed at the material discharge port and a plurality of control components for controlling the opening / closing of any of the valves; the powder spreading mechanism comprises a rotating shaft axially connected to the frame and a plurality of powder spreading units arranged on the rotating shaft, at least one powder spreading unit is longitudinally aligned with any of the valves, and any of the powder spreading units comprises a mounting base detachably mounted on the rotating shaft The hopper comprises a seat and a wall panel group installed on the mounting base; the wall panel group comprises a rectangular wall panel and two fan-shaped wall panels arranged along the axial direction of the rotating shaft, and the three wall panels are connected end to end and form a box body with an open structure on one side with the mounting base; the three wall panels are respectively provided with a plurality of powder sprinkling holes, and any valve comprises a valve body fixedly arranged at the bottom of the hopper and a door body slidably connected to the valve body; the valve body is provided with a first discharge slot connected with the discharge port; the door body is provided with a second discharge slot, and the second discharge slot is connected with the first discharge slot.

2. The powder spreading machine according to claim 1, characterized in that: The projection of any of the powder spreading units on a plane perpendicular to the central axis of the rotating shaft is fan-shaped.

3. The powder spreading machine according to claim 1, characterized in that: Any of the valve bodies is also provided with a slide groove, the slide groove is communicated with the first discharge channel, and the door body is arranged in the slide groove.

4. The powder spreading machine according to claim 1 or 3, characterized in that: It also includes an elastic component; any of the control components includes a telescopic component fixedly arranged on the frame, and the telescopic end of the telescopic component is connected to the door body; one end of the elastic component is fixedly connected to the door body, and the other end is fixedly connected to the valve body.

5. The powder spreading machine according to claim 4, characterized in that: Any of the control mechanisms also includes a limit assembly, which includes a limit slide rail arranged on the valve body and a limit mounting plate slidably arranged on the limit slide rail; the length direction of the limit slide rail is the same as the telescopic direction of the telescopic component, the limit mounting plate is fixedly connected to the door body, and the limit mounting plate is fixedly connected to one end of the elastic assembly.

6. The powder spreading machine according to claim 5, characterized in that: The limiting mounting plate is provided with a groove, and the limiting slide rail is embedded in the groove.

7. The powder spreading machine according to claim 4, characterized in that: The telescopic component is a telescopic cylinder, and the frame is also equipped with a plurality of air supply pipelines for providing air pressure to any telescopic cylinder.

8. The powder spreading machine according to claim 1, characterized in that: A feeding roller is arranged in the hopper, and the end of the feeding roller passes through the hopper and is connected to the frame axis; the feeding roller is arranged close to the discharge port, and a gap through which powder can pass is formed between the side wall of the feeding roller and the inner side wall of the hopper.

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