A powder paste paving method and paving mechanism based on gear pump principle

Abstract

The application belongs to the field of powder paste paving, and particularly relates to a powder paste paving method and a paving mechanism based on the principle of a gear pump. The method is as follows: making raw materials pass through the gear pump 2, making the feeding port of the gear pump 2 uniformly feed along the width direction of the gear, and making the raw materials uniformly exit from the discharge port of the gear pump 2 and keep uniform along the width direction of the gear. The mechanism comprises the gear pump 2, and a discharge plate 6 matched with the gear width in the gear pump 2 is arranged at the discharge port of the gear pump 2. The gear pump is used to form more accurate quantitative slurry, the flow is only related to the rotating speed of the gear pump, the flow is more easily controlled, the discharge plate matched with the gear width in the gear pump is arranged, the uniformity of the more accurately quantified slurry is kept after being discharged, the thickness of the produced powder paste is more uniform along the width direction, and the discharging mode is changed to natural sliding forming from the discharge port.

Description

Technical Field

[0001] This invention belongs to the field of rice noodle slurry spreading, specifically relating to a rice noodle slurry spreading method and spreading mechanism based on the principle of a gear pump. Background Technology

[0002] In the production of starch products (especially vermicelli), the prepared slurry is injected into a storage tank. A shaping roller, in conjunction with the tank, utilizes the slurry's viscosity to coat it in layers, which are then conveyed onto a steel conveyor belt for the steaming process (e.g., application number CN2016206543078, rapid aging device for sweet potato vermicelli). During this process, because the slurry is not uniform (i.e., the dilution and viscosity of each portion are different), the amount of slurry carried on the shaping roller varies significantly at any given moment, resulting in vermicelli of uneven thickness.

[0003] The applicant conducted further research on this and formed patent application number CN2023218146360, a starch product slurrying mechanism. It uses two rollers to cooperate so that the slurry passes through the gap between the two rollers to achieve a certain quantitative effect. However, the quantitative effect of using the gap between the rollers is poor, and the formation of layered slurry still relies on one of the rollers to wrap the slurry to form a layered structure, which still has the above-mentioned problems. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method and mechanism for spreading rice noodle slurry based on the principle of a gear pump.

[0005] The objective of this invention is achieved in the following manner: a method for spreading rice noodle paste based on the principle of a gear pump, wherein the method is as follows: the raw material is fed through a gear pump 2, and the raw material is fed uniformly along the width direction of the gear at the inlet of the gear pump 2; and the raw material is kept uniform along the width direction of the gear after being discharged from the outlet of the gear pump 2.

[0006] A starch sheet spreading mechanism based on the principle of a gear pump includes a gear pump 2, and a discharge plate 6 that matches the width of the gear in the gear pump 2 is provided at the discharge port of the gear pump 2.

[0007] Furthermore, a slurry pool 3 is provided at the feed inlet of the gear pump 2, and the minimum width of the slurry pool 3 along the gear axis is not less than the width of the gear in the gear pump 2.

[0008] Furthermore, it also includes a frame 1, to which the gear pump 2 is fixed; the gear pump 2 includes two mounting plates 20, both of which are fixedly connected to the frame 1, and a first gear shaft 21 and a second gear shaft 22 are rotatably connected between the two mounting plates 20, with the first gear shaft 21 and the second gear shaft 22 meshing; the first gear shaft 21 is connected to a rotation drive mechanism 23, and a C-shaped baffle 24 is respectively provided on the outside of the first gear shaft 21 and the second gear shaft 22, with the gaps on the front and rear sides between the two C-shaped baffles 24 forming the inlet and outlet of the gear pump 2, respectively, and a mounting plate 20 is fixedly connected to each end of the C-shaped baffle 24.

[0009] Furthermore, the rotation drive mechanism 23 includes a drive motor 231, the output end of the drive motor 231 is fixedly connected to one end of the motor reducer 232, the other end of the motor reducer 232 is fixedly connected to the first drive sprocket 233, the first drive sprocket 233 is connected to the first driven sprocket 234 through a chain; one end of the first gear shaft 21 extends out from the mounting plate 20 and is fixedly connected to the first driven sprocket 234.

[0010] Furthermore, a channel steel 25 is provided on the outside of the C-shaped baffle 24, and a mounting plate 20 is fixedly connected to each end of the channel steel 25. Screw holes 251 are arranged in an array along the length direction on both sides of the channel steel 25, and the screw holes 251 are arranged facing the outer surface of the C-shaped baffle 24.

[0011] Furthermore, it also includes a stirring mechanism 4, which includes a second drive sprocket 401, one end of a second gear shaft 22 extending from the mounting plate 20 and fixedly connected to it. The second drive sprocket 401 is connected to a second driven sprocket 402 via a chain. The second driven sprocket 402 is fixedly connected to one end of a first rotating shaft 41. A first support plate 252, a second support plate 253, and a third support plate 254 are sequentially fixedly connected in the lateral extension direction of the slurry tank 3. The other end of the first rotating shaft 42 passes through the first support plate 252 and the second support plate 253 in sequence and is fixedly connected to a drive gear 411. The first rotating shaft 41 is rotatably connected to both the first support plate 252 and the second support plate 253.

[0012] A second rotating shaft 42 is provided between the second support plate 253 and the third support plate 254. The second rotating shaft 42 is rotatably connected to both the second support plate 253 and the third support plate 254. The second rotating shaft 42 is fixedly connected to the driven gear 421 that meshes with the driving gear 411. Both ends of the second rotating shaft 42 extend from the second support plate 253 and the third support plate 254 respectively and are fixedly connected to one end of a short arm 43. The other end of the short arm 43 is rotatably connected to one end of the first connecting rod 44. The other end of the first connecting rod 44 is rotatably connected to one end of the second connecting rod 45. The other end of the second connecting rod 45 extends into the slurry tank 3. A lever 46 is fixedly connected between the ends of the two second connecting rods 45 that extend into the slurry tank 3. The body of the second connecting rod 45 is rotatably connected to the side wall of the slurry tank 3. The short arm 43, the first connecting rod 44, and the second connecting rod 45 form a three-bar linkage mechanism.

[0013] Furthermore, a flow guiding mechanism 5 is provided below the discharge plate 6. The flow guiding mechanism 5 includes two positioning plates 51, which are fixedly connected to the frame 1. The positioning plates 51 are provided with strip grooves 511. It also includes a support rod 52, with both ends of the support rod 52 respectively set in the strip grooves 511 of the two positioning plates 51. It also includes an adjusting plate 53, which is provided with through holes for the support rod 52 to pass through, as well as strip holes 531. The positioning plate 51 and the adjusting plate 53 are fixed together by bolts passing through the strip holes 531 and the positioning plates 51. The support rod 52 is fixedly connected to a flow guiding plate 54, which is located below the discharge plate 6. The top of the flow guiding plate 54 abuts against the bottom of the discharge plate 6.

[0014] Furthermore, a waste liquid tank 7 is provided below the gear pump 2 and the slurry tank 3, and the waste liquid tank 7 is located below the rear end of the guide plate 54.

[0015] Compared to existing technologies, this invention utilizes a gear pump to achieve more precise quantitative control of the slurry. The flow rate is only related to the speed of the gear pump, making it easier to control the flow rate. Furthermore, it features a discharge plate that matches the width of the gears in the gear pump, ensuring that the more precisely quantitative slurry maintains uniformity after discharge. This results in more uniform thickness of the produced rice noodle sheets along the width direction. In addition, the more precise quantitative control is achieved by changing the slurry discharge method to allow it to naturally slide down from the discharge port to form the slurry. Attached Figure Description

[0016] Figure 1 This is one of the structural diagrams of the rice noodle spreading mechanism;

[0017] Figure 2 This is the second schematic diagram of the starch sheet spreading mechanism;

[0018] Figure 3 This is a cross-sectional view of the rice noodle spreading mechanism;

[0019] Figure 4 This is an enlarged view of the stirring mechanism.

[0020] Figure 5 This is an enlarged view of the flow guiding mechanism.

[0021] Figure 6 This is a schematic diagram of the flow guiding mechanism in the stopped and cut-off state.

[0022] Among them, rack 1,

[0023] Gear pump 2, mounting plate 20, first gear shaft 21, second gear shaft 22, rotation drive mechanism 23, drive motor 231, motor reducer 232, first driving sprocket 233, first driven sprocket 234, C-shaped baffle 24, channel steel 25, screw hole 251, first support plate 252, second support plate 253, third support plate 254;

[0024] 3. Slurry pool

[0025] Stirring mechanism 4, second driving sprocket 401, second driven sprocket 402, first rotating shaft 41, driving gear 411, second rotating shaft 42, driven gear 421, short arm 43, first connecting rod 44, second connecting rod 45, lever 46;

[0026] Flow guiding mechanism 5, positioning plate 51, strip groove 511, support rod 52, handle 521, adjusting plate 53, strip hole 531, flow guiding plate 54;

[0027] 6. Discharge plate, 7. Waste liquid tank, 71. Drain hole. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0030] As attached Figure 1-3As shown, a method for spreading rice noodle paste based on the principle of a gear pump is described. The method involves feeding the raw material through a gear pump 2, ensuring that the material is fed evenly along the width of the gear at the inlet of the gear pump 2, and ensuring that the material remains uniform along the width of the gear after exiting from the outlet of the gear pump 2.

[0031] This invention utilizes the good metering effect of gear pumps. Therefore, to ensure the accuracy of metering, on the one hand, the material is fed evenly at the feed port of gear pump 2 so that the material is discharged evenly at every point along the width direction during discharge; on the other hand, to ensure that the thickness of the produced rice noodle sheet is uniform, the raw material is discharged evenly along the width direction of the gear after exiting from the discharge port of gear pump 2.

[0032] To achieve the above-mentioned effect, specifically, a powder sheet spreading mechanism based on the gear pump principle includes a gear pump 2. The outlet of the gear pump 2 is provided with a discharge plate 6 that matches the width of the gear in the gear pump 2. Specifically, "matching" means that the width of the gear in the gear pump 2 and the width of the discharge plate 6 are preferably equal, or the width error is controlled within ±5mm. The left and right ends of the discharge plate 6 are bent upward to form a limit, so that it can receive the material discharged from the gear pump 2 and keep it uniform.

[0033] Furthermore, a slurry pool 3 is provided at the feed inlet of the gear pump 2. The minimum width of the slurry pool 3 along the gear axis is not less than the width of the gear in the gear pump 2. The slurry pool 3 must at least satisfy the requirement that the width at the feed inlet of the gear pump 2 is greater than the width of the gear in the gear pump 2. In actual use, the slurry pool 3 must be filled with sufficient slurry so that the gear pump 2 can fully feed the slurry.

[0034] The gear width can be 200mm~2500mm depending on the production scale, but is generally 800mm~1800mm in actual production lines. The gear speed is controlled between 0~100 rpm, but is generally 30~70 rpm in actual production lines.

[0035] Furthermore, it also includes a frame 1, to which the gear pump 2 is fixed; the gear pump 2 includes two mounting plates 20, both of which are fixedly connected to the frame 1, and a first gear shaft 21 and a second gear shaft 22 are rotatably connected between the two mounting plates 20, with the first gear shaft 21 and the second gear shaft 22 meshing; the first gear shaft 21 is connected to a rotation drive mechanism 23, and a C-shaped baffle 24 is respectively provided on the outside of the first gear shaft 21 and the second gear shaft 22, the gaps on the front and rear sides between the two C-shaped baffles 24 forming the inlet and outlet of the gear pump 2 respectively, and a mounting plate 20 is fixedly connected to each end of the C-shaped baffle 24. The relationship between the C-shaped baffle 24 and the gear shaft is similar to the relationship between the housing and the gear in a traditional gear pump, with a very small gap between them, and since the slurry has viscosity (not water), even a small gap will not leak, allowing the slurry to be transported between the tooth groove and the C-shaped baffle 24.

[0036] The plane formed between the axes of the first gear shaft 21 and the second gear shaft 22 preferably forms an angle of 10° to 30° with the vertical plane, that is, the gear pump 2 is inclined, so that the slurry tank 3 is fed obliquely downwards into the gear pump 2 by gravity, and the slurry is discharged obliquely downwards from the gear pump 2.

[0037] Both ends of the first gear shaft 21 and the second gear shaft 22 are connected to the mounting plate 20 via bearings.

[0038] Furthermore, the rotation drive mechanism 23 includes a drive motor 231, the output end of the drive motor 231 is fixedly connected to one end of the motor reducer 232, the other end of the motor reducer 232 is fixedly connected to the first drive sprocket 233, the drive motor 231 and the motor reducer 232 are both fixedly connected to the frame 1, the first drive sprocket 233 is connected to the first driven sprocket 234 through a chain; one end of the first gear shaft 21 extends from the mounting plate 20 and is fixedly connected to the first driven sprocket 234.

[0039] Furthermore, a channel steel 25 is provided on the outside of the C-shaped baffle 24. A mounting plate 20 is fixedly connected to each end of the channel steel 25. Screw holes 251 are arranged in an array along the length direction on both sides of the channel steel 25, and the screw holes 251 are arranged facing the outer surface of the C-shaped baffle 24. The function of the channel steel 25 is: on the one hand, it is mainly used to strengthen the overall strength of the machine; on the other hand, through the array of screw holes 251, the screws passing through the screw holes 251 abut against the outer surface of the C-shaped baffle 24, preventing the C-shaped baffle 24 from deforming during long-term use, and serving as an auxiliary support.

[0040] Further details are attached. Figure 1-4 As shown, it also includes a stirring mechanism 4, which includes a second drive sprocket 401 with one end of a second gear shaft 22 extending from the mounting plate 20 and fixedly connected. The second drive sprocket 401 is connected to a second driven sprocket 402 via a chain. The second driven sprocket 402 is fixedly connected to one end of a first rotating shaft 41. A first support plate 252, a second support plate 253, and a third support plate 254 are sequentially fixedly connected in the lateral extension direction of the slurry tank 3. The first support plate 252, the second support plate 253, and the third support plate 254 can also be further fixedly connected to the channel steel 25 at the top. The other end of the first rotating shaft 42 passes through the first support plate 252 and the second support plate 253 in sequence and is fixedly connected to a drive gear 411. The first rotating shaft 41 is rotatably connected to the first support plate 252 and the second support plate 253, and preferably rotatably connected via bearings.

[0041] A second rotating shaft 42 is provided between the second support plate 253 and the third support plate 254. The second rotating shaft 42 is rotatably connected to both the second support plate 253 and the third support plate 254, preferably via bearings. The second rotating shaft 42 is fixedly connected to the driven gear 421 that meshes with the driving gear 411. Both ends of the second rotating shaft 42 extend from the second support plate 253 and the third support plate 254, respectively, and are fixedly connected to one end of a short arm 43. The other end of the short arm 43 is rotatably connected to the first connecting rod. One end of the first connecting rod 44 is rotatably connected to one end of the second connecting rod 45. The other end of the second connecting rod 45 extends into the slurry tank 3. The ends of the two second connecting rods 45 extending into the slurry tank 3 are fixedly connected to the lever 46. The body of the second connecting rod 45 is rotatably connected to the side wall of the slurry tank 3. The short arm 43, the first connecting rod 44, and the second connecting rod 45 form a three-bar linkage mechanism. The length of the short arm 43 mainly determines the swing amplitude of the lever 46. Therefore, the length of the short arm 43 is generally not greater than 1 / 2 of the width of the feed inlet of the gear pump 2.

[0042] This allows the gear pump 2 and the stirring mechanism 4 to share a single drive system.

[0043] Unlike the traditional method of slurry spreading where the shaping roller floats on the surface of the slurry pool and carries the slurry to form the slurry, in this method the slurry enters the feed inlet by gravity. Therefore, the lever 46 is inserted into the slurry pool 3 to stir the slurry, so that the slurry around the feed inlet remains active and does not solidify on the board surface, while maintaining a good slurry feeding effect.

[0044] Further details are attached. Figure 5-6 As shown, the device includes a sizing mechanism, which in this application is a gear pump 2. A discharge plate 6 is provided at the discharge port of the sizing mechanism. A flow guiding mechanism 5 is provided below the discharge plate 6. The flow guiding mechanism 5 includes a rotatable flow guiding plate 54. By rotating, the flow guiding plate 54 can tilt downwards away from the front end of the discharge plate 6, i.e., as shown... Figure 1 It is in a normal feeding state, or tilted downwards near the rear end of the discharge plate 6, that is... Figure 6 When the machine is in a stopped and cut-off state, a waste liquid tank 7 is set below the rear end of the discharge plate 6; the flow guiding mechanism 5 is also provided with an adjustment structure that can adjust the angle of the flow guiding plate 54.

[0045] Furthermore, a flow guiding mechanism 5 is provided below the discharge plate 6. The flow guiding mechanism 5 includes two positioning plates 51, which are fixedly connected to the frame 1. The positioning plates 51 are provided with strip grooves 511. It also includes a support rod 52, with both ends of the support rod 52 respectively set in the strip grooves 511 of the two positioning plates 51. It also includes an adjusting plate 53, which is provided with a through hole for the support rod 52 to pass through, and a strip hole 531. The strip hole 531 is arranged parallel to the strip groove 511, and a bolt passes through the strip groove. Hole 531 and positioning plate 51 are used to fix positioning plate 51 and adjusting plate 53; the support rod 52 is fixedly connected to guide plate 54, which is set below discharge plate 6. The top of guide plate 54 abuts against the bottom of discharge plate 6, so that by loosening the bolts, adjusting plate 53 can move back and forth through hole 531, while carrying support rod 52 back and forth, adjusting the position of guide plate 54 to change the angle of guide plate 54 to meet the distance between guide plate 54 and the steel belt below that receives powder skin. (Guide plate 54 can be flipped. When the machine stops, it can be flipped to this position for quick material cutting. Then, the wastewater in cleaning tank 3 is discharged into waste liquid tank 7 for easy collection of waste.)

[0046] Furthermore, at least one end of the support rod 52 is fixedly connected to a handle 521 for manually controlling the rotation of the guide plate 54 to cut off material when the machine stops.

[0047] Furthermore, a waste liquid tank 7 is provided below the gear pump 2 and the slurry tank 3, and a drain hole 71 is provided behind the waste liquid tank 7. The waste liquid tank 7 is fixedly connected to the frame 1.

[0048] During use, ensure that there is enough slurry in the slurry tank 3, at least enough to cover the tooth width of the second gear shaft 22. Start the drive motor 231. The drive motor 231 drives the first drive sprocket 233 to rotate through the motor reducer 232. The first drive sprocket 233 drives the first driven sprocket 234 to rotate through the chain, causing the first gear shaft 21 to rotate. At the same time, the meshing second gear shaft 22 rotates. The slurry is continuously carried out by the gear pump 2. After the slurry is discharged from the outlet of the gear pump 2, it remains uniform in the width direction and falls into the discharge plate 6 with a matching width to form a layered structure.

[0049] Furthermore, the rotation of the second gear shaft 22 causes the second driving sprocket 401 to rotate. The second driving sprocket 401 drives the second driven sprocket 402 to rotate via a chain, causing the driving gear 411 to rotate synchronously. The driving gear 411 drives the meshing driven gear 421 to rotate, causing the second rotating shaft 42 to drive the short arm 43 to rotate, and sequentially pulling the first connecting rod 44 and the second connecting rod 45. The second connecting rod 45 itself forms a lever mechanism, causing the lever 46 to continuously swing in the slurry pool 3, keeping the slurry around the feed inlet active and preventing it from agglomerating on the plate surface, while maintaining a good slurry feeding effect.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A mechanism for laying a powder paste based on the principle of a gear pump, characterized in that: The gear pump (2) is provided with a discharge plate (6) matched with the gear width in the gear pump (2) at the discharge port of the gear pump (2); The gear pump (2) is provided with a slurry tank (3) at the feeding port, and the minimum width of the slurry tank (3) in the gear axis direction is not less than the gear width in the gear pump (2); Further comprising a rack (1), the gear pump (2) is fixed to the rack (1); the gear pump (2) comprises two mounting plates (20), both of which are fixedly connected to the rack (1), and the first gear shaft (21) and the second gear shaft (22) are rotatably connected between the two mounting plates (20), respectively, the first gear shaft (21) and the second gear shaft (22) are engaged; the first gear shaft (21) is connected to a rotating drive mechanism (23), and the first gear shaft (21) and the second gear shaft (22) are respectively provided with a C-shaped baffle (24) outside; the gap between the two C-shaped baffles (24) on the front and back sides forms the feeding port and the discharge port of the gear pump (2), respectively, and the two ends of the C-shaped baffle (24) are fixedly connected to a mounting plate (20); The rotating drive mechanism (23) comprises a driving motor (231), the output end of the driving motor (231) is fixedly connected to one end of a motor reducer (232), the other end of the motor reducer (232) is fixedly connected to a first driving sprocket (233), and the first driving sprocket (233) is connected to a first driven sprocket (234) through a chain; one end of the first gear shaft (21) extends out of the mounting plate (20) and is fixedly connected to the first driven sprocket (234); The C-shaped baffle (24) is provided with a channel steel (25) outside, the channel steel (25) is fixedly connected to a mounting plate (20) at both ends, and screw holes (251) are arranged along the length direction on both sides of the channel steel (25) and are arranged towards the outer surface of the C-shaped baffle (24); Further comprising a stirring mechanism (4), the stirring mechanism (4) comprises a second driving sprocket (401) fixedly connected to one end of the second gear shaft (22) extending out of the mounting plate (20), the second driving sprocket (401) is connected to a second driven sprocket (402) through a chain, the second driven sprocket (402) is fixedly connected to one end of a first rotating shaft (41), and a first support plate (252), a second support plate (253) and a third support plate (254) are fixedly connected in sequence along the length direction on the side of the slurry tank (3); the other end of the first rotating shaft (41) sequentially penetrates through the first support plate (252) and the second support plate (253) and is fixedly connected to a driving gear (411), and the first rotating shaft (41) is rotatably connected with the first support plate (252) and the second support plate (253); A second rotating shaft (42) is arranged between the second support plate (253) and the third support plate (254), and is rotatably connected to the second support plate (253) and the third support plate (254), and is fixedly connected to a driven gear (421) engaged with the driving gear (411). The second rotating shaft (42) has two ends respectively extending out of the second support plate (253) and the third support plate (254) and fixedly connected to one end of a short arm (43), and the other end of the short arm (43) is rotatably connected to one end of a first connecting rod (44), and the other end of the first connecting rod (44) is rotatably connected to one end of a second connecting rod (45), and the other end of the second connecting rod (45) extends into the pulp pool (3), and the two second connecting rods (45) are fixedly connected to a push rod (46) between the ends extending into the pulp pool (3), and the second connecting rod (45) is rotatably connected to the side wall of the pulp pool (3). The short arm (43), the first connecting rod (44) and the second connecting rod (45) form a three-link mechanism.

2. A powder screeding mechanism based on the principle of a gear pump as claimed in claim 1, characterized in that: A guide mechanism (5) is arranged below the discharging plate (6), the guide mechanism (5) comprises two positioning plates (51), the positioning plates (51) are fixedly connected to the rack (1), the positioning plates (51) are provided with strip-shaped grooves (511), further comprising a supporting rod (52), the supporting rod (52) is arranged in the strip-shaped grooves (511) of the two positioning plates (51), further comprising an adjusting plate (53), the adjusting plate (53) is provided with a through hole through which the supporting rod (52) passes, and a strip hole (531), the positioning plate (51) and the adjusting plate (53) are fixed by a bolt passing through the strip hole (531) and the positioning plate (51); the supporting rod (52) is fixedly connected to a guide plate (54), the guide plate (54) is arranged below the discharging plate (6), and the top of the guide plate (54) abuts against the bottom of the discharging plate (6).

3. A powder screeding mechanism based on the principle of a gear pump as claimed in claim 2, characterized in that: The gear pump (2) and the pulp pool (3) are provided with a waste liquid tank (7) below, and the waste liquid tank (7) is located below the rear end of the guide plate (54).

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