Powder spreading mechanism for spreading piezoelectric ceramic powder

Abstract

The powder spreading mechanism is used for spreading powder in a container and comprises a rod body capable of being in a vertical state and a scraper connected with the first end of the rod body, the first end of the rod body can stretch into the container to enable the scraper to spread the powder, the rod body can rotate around the vertically-extending axis, and the rod body can rotate around the vertically-extending axis. In the rotating state of the rod body, the side wall face, facing powder, of the scraper is called as a material facing face, the scraper is provided with a groove penetrating through the material facing face, the material facing face is provided with a plane located beside the groove, and the flattening effect of the flattening mechanism on the powder is good.

Description

Technical Field

[0001] The present invention relates to a powder spreading mechanism, and particularly to a powder spreading mechanism for leveling piezoelectric ceramic powder. Background Art

[0002] Piezoelectric ceramics are an important functional material. Since they can realize the mutual conversion of electrical energy and mechanical energy, they have become important materials used in advanced electronic components such as ultrasonic motors, actuators, sensors, and transducers. They are also one of the important materials selected in the field of intelligent material technology and have a wide range of applications in fields such as micro mechanical manufacturing, ultra-precision machining, integrated circuit manufacturing, biomedicine, optical microprocessing systems, aerospace, and scanning probe microscopes.

[0003] During the research and development and production process of piezoelectric ceramic materials, granulated piezoelectric ceramic powder is usually put into a mold, and a green body is made by a dry pressing method, and then successively through processes such as debinding, pre-sintering, sintering, and poling to complete the preparation of the ceramic sheet. For example, "A Wide Temperature Range Sodium Bismuth Titanate-Based Lead-Free Piezoelectric Ceramic and Its Preparation Method" disclosed in the Chinese invention application with the patent application number CN202410070947.3 (publication number CN117886602A).

[0004] Among them, the quality of the green body formed by dry pressing has a great influence on the performance of the ceramic sheet. Especially when preparing thick sheets such as underwater transducers and ceramic transformers, or cylindrical samples for ignition and detonation, due to the product performance and structural design requirements, their size specifications are with a thickness of 1 mm - 30 mm, and the size range has a large span. The fluidity and spreadability of the piezoelectric ceramic raw material powder are affected by environmental humidity and temperature and become worse in a deeper mold cavity, and it is easy to have uneven distribution and agglomeration and accumulation phenomena in the mold, resulting in local depressions on the surface of the green body due to insufficient powder amount, or local excessive pressure due to excessive powder concentration, and defects such as delamination, which damage the performance of the product. At present, there is no special tool to solve this problem, and usually, the operator needs to adjust by experience and feel, which is time-consuming and laborious, and cannot ensure the uniform stability of the quality of the green body sample. In addition, in order to ensure uniform stress and dense structure of the piezoelectric ceramic green body sample during the pressing process and avoid defects such as cracks and delamination, it is necessary to pre-level the surface of the powder in the mold cavity to solve the problems of uneven powder distribution and local accumulation.

[0005] Therefore, when dry pressing piezoelectric ceramic sheets of different specifications, a suitable piezoelectric ceramic powder spreading mechanism for improving the uniformity of the powder and preventing delamination is required to ensure that the surface of the green body is flat after forming and no defects such as cracks and delamination occur, and to better improve the production efficiency and product quality of piezoelectric ceramic samples. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a powder spreading mechanism that can improve the powder uniformity and prevent powder stratification in view of the current situation of the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows: A powder spreading mechanism for spreading piezoelectric ceramic powder, which is used to spread the powder in a container. It is characterized in that it includes a rod body that can be in a vertical state and a scraper connected to the first end of the rod body. The first end of the rod body can extend into the container so that the scraper levels the powder material. The rod body can rotate around an axis extending vertically. When the rod body is in a rotating state, the side wall surface of the scraper facing the powder is called the material-facing surface. There is a groove penetrating the material-facing surface on the scraper, and the material-facing surface has a plane located beside the groove.

[0008] In order to improve the powder spreading efficiency, with the straight line vertically passing through the central part of the scraper as the demarcation line, the groove and the plane are symmetrically located on both sides of the demarcation line.

[0009] Preferably, the scraper is detachably connected to the rod body, so that scrapers of different sizes can be replaced and combined to quickly level the powder.

[0010] In order to achieve the detachable connection between the scraper and the rod body, a first magnetic member is provided on the scraper, and a second magnetic member that can be magnetically coupled with the first magnetic member is provided on the rod body. The first magnetic member and / or the second magnetic member extend in a direction perpendicular to the axis of the rod body, and in this way, the position of the scraper relative to the axis of the rod body can also be adjusted.

[0011] In order to be able to adapt to the quick leveling of the powder material in containers with different inner diameters, there are at least two rod bodies. One of the rod bodies is always in a vertical state, and this rod body is called the central rod. A scraper is connected to the lower end of the central rod. The remaining rod bodies are called side rods. One end of the side rod is rotatably installed on the central rod, and the rotation axis of the side rod extends in the horizontal direction. A scraper is connected to the other end of the side rod. When the side rod rotates to a vertical state, the other end of the side rod is located in the container, and the scraper on the central rod and the scraper on the side rod are on the same straight line. When the side rod rotates to a horizontal state, the whole side rod is located outside the container. When the inner diameter of the container is small, the side rod can be not used or a smaller number of side rods can be used. At this time, the unused side rod is rotated so that the whole is located outside the container, without affecting the rotation of the central rod. When the inner diameter of the container is large, the side rods that need to participate in leveling the powder are rotated into the container, and the side rods that do not need to participate in leveling the powder are rotated to positions outside the container.

[0012] To position the powder spreading mechanism relative to the container for facilitating the operator to rotate the rod body, the powder spreading mechanism further includes a support rod extending in the horizontal direction. The support rod can be pressed against the container mouth of the container for holding the powder to achieve the vertical positioning of the whole powder spreading mechanism. The support rod can be telescopic along its length direction so that the support rod can support containers with different diameters. The central part of the support rod is detachably connected to the central rod, and the support rod can be positioned at different heights of the central rod to adjust the position of the support rod relative to the central rod, change the distance between the scraper on the central rod and the bottom wall of the container, and make the scraper in the position of the loose packing thickness of the powder to adapt to the leveling of powders with different thicknesses.

[0013] To achieve the detachable connection between the support rod and the central rod, the support rod is provided with a first tooth part, and the central rod is provided with a first rack extending along its vertical direction. The first tooth part can be detachably embedded in different tooth grooves of the first rack.

[0014] To enable the scraper on the side rod to adapt to the leveling of powders with different thicknesses, the side rod includes a positioning rod and a sliding rod. One end of the positioning rod is rotatably installed on the central rod, and the rotation axis of the positioning rod extends in the horizontal direction. A chute is provided along the length direction of the positioning rod, and the chute penetrates through the other end of the positioning rod. A sliding rod capable of moving along its length direction is arranged in the chute. One end of the sliding rod is detachably connected to the chute, and the other end of the sliding rod extends out of the chute and is connected to the scraper. The extending length of the sliding rod can be adjusted according to the thickness of the powder to make the scraper in the position of the loose packing thickness of the powder.

[0015] To enable the sliding rod to move relative to the chute but be positioned after moving in place, the sliding rod is provided with a second tooth part, and a second rack extending along the length direction is arranged in the chute. The second tooth part can be detachably embedded in different tooth grooves of the second rack.

[0016] To make the groove on the scraper along the circumferential direction of the central rod, the sliding rod and the scraper are connected through a mounting block. The mounting block can rotate relative to the sliding rod, and the rotation axis of the mounting block extends in the direction perpendicular to the axis of the sliding rod.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The powder spreading mechanism of the present invention includes a rod body and a scraper, and the scraper is provided with a groove with a notch penetrating the material receiving surface. When the rod body rotates, the scraper can be driven to move. The groove can accommodate the excessively accumulated powder and transport the excessive powder to the place with insufficient powder amount for filling, and also cooperate with the plane on the material receiving surface to quickly level the spread powder. Moreover, the movement of the scraper can improve the overall fluidity and loose packing density of the powder, effectively avoiding the generation of delamination defects after the powder is pressed into a green compact.

[0018] The powder spreading mechanism of the present invention can solve the problems that in the process of preparing piezoelectric ceramic green bodies, the powder is prone to uneven distribution and agglomeration and accumulation in the mold, resulting in defects such as local depression, delamination, and cracking after the green body is formed. It can preferably improve the production efficiency and product quality of piezoelectric ceramic samples, reduce the production cost, and the device has the characteristics of simple structure, convenient installation, and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a schematic structural diagram of the powder spreading mechanism according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a sectional view of;

[0021] Figure 3 is Figure 2 an enlarged view of part A in;

[0022] Figure 4 is Figure 2 an enlarged view of part B in;

[0023] Figure 5 is Figure 1 a schematic structural diagram of the support rod in;

[0024] Figure 6 is Figure 1 a schematic structural diagram of one of the scraping blades and the corresponding first magnetic member in;

[0025] Figure 7 is Figure 1 an exploded view of the central rod and the second magnetic member and the scraping blade thereon in;

[0026] Figure 8 is Figure 1 an exploded view of one of the side rods and the second magnetic member and the scraping blade thereon in;

[0027] Figure 9 is Figure 8 a schematic structural diagram of the sliding rod in;

[0028] Figure 10 FIG. is a schematic diagram of the powder spreading mechanism applied to a container in Experiment 1;

[0029] Figure 11 FIG. is a schematic diagram of the powder spreading mechanism applied to a container in Experiment 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention will be further described in detail below with reference to the embodiments in the drawings.

[0031] As Figures 1 - 9 shown, the powder spreading mechanism of this preferred embodiment is used to level the piezoelectric ceramic powder in the container 6 (such as a mold).

[0032] The powder spreading mechanism includes a rod that can be in a vertical state and a doctor blade 1 connected to the first end of the rod. The first end of the rod can extend into the container 6 so that the doctor blade 1 levels the powder. The rod can rotate around an axis extending vertically. In the rotating state of the rod, the side wall of the doctor blade 1 facing the powder is called the material-facing surface. The doctor blade 1 is provided with a groove 11 penetrating the material-facing surface, and the material-facing surface has a plane 12 beside the groove 11. In this embodiment, taking the straight line vertically passing through the central part of the doctor blade 1 as the dividing line L, the groove 11 and the plane 12 are symmetrically located on both sides of the dividing line L.

[0033] When the rod rotates (the rod can be rotated manually or driven by a motor), it can drive the doctor blade 1 to move. During this process, the groove 11 accommodates the excessively accumulated powder and transports the excessive powder to the place where the powder amount is insufficient for filling. At the same time, it also cooperates with the plane 12 to quickly level the spread powder. And the doctor blade can improve the overall fluidity and loose packing density of the powder during the movement, effectively avoiding the delamination defect problem that occurs after the powder is pressed into a green body.

[0034] The wall surface of the groove 11 is preferably an arc surface to avoid powder jamming. In this embodiment, both of the opposite side wall surfaces of the doctor blade 1 can be used as the material-facing surface. According to the different rotation directions of the rod, different side wall surfaces of the doctor blade 1 are used as the material-facing surface. For the sake of easy understanding, taking Figure 6 the orientation of the doctor blade 1 in [description], both the front wall surface and the rear wall surface of the doctor blade 1 can be used as the material-facing surface. For example, when the rod rotates clockwise, the front wall surface of the doctor blade 1 is used as the material-facing surface, then when the rod rotates counterclockwise, the rear wall surface of the doctor blade 1 is used as the material-facing surface. In this way, there are two grooves 11 on the doctor blade 1, one groove 11 penetrates the front wall surface of the doctor blade 1, and the other groove 11 penetrates the rear wall surface of the doctor blade 1. However, it should be noted that these two grooves 11 are not connected.

[0035] The doctor blade 1 is detachably connected to the rod, so that different sizes of doctor blades 1 can be replaced and combined to quickly level the powder. When the inner diameter of the container 6 is relatively large, a large-sized doctor blade 1 is selected. When the size of the container 6 is relatively small, a small-sized doctor blade 1 is selected.

[0036] The scraping blade 1 is provided with a first magnetic member 13, and the rod body is provided with a second magnetic member 2 that can be magnetically attracted and cooperated with the first magnetic member 13. The first magnetic member 13 and / or the second magnetic member 2 extend in a direction perpendicular to the axis of the rod body, so that the position of the scraping blade 1 relative to the axis of the rod body can also be adjusted. In this embodiment, the first magnetic member 13 is a sheet-shaped magnetic substance, such as a steel sheet, which is installed on the upper surface of the scraping blade 1 and extends in a direction perpendicular to the axis of the rod body. The second magnetic member 2 is a columnar magnet. The two can not only be easily disassembled and assembled, but also the steel sheet can be attracted to the magnet at different positions according to needs to change the operating range of the scraping blade 1. For example, when the rod body is in a vertical state, the scraping blade 1 can move and be positioned relative to the rod body in the horizontal direction. When the rod body is in a horizontal state, the scraping blade 1 can move and be positioned relative to the rod body in the vertical direction.

[0037] There are at least two rod bodies, and one of the rod bodies is always in a vertical state, and this rod body is called the central rod 3, and the other rod bodies are called side rods 4. The upper end of the central rod 3 is located outside the container 6, and the lower end is connected with a scraping blade 1. The second magnetic member 2 is adhesively bonded to the central rod 3. Of course, other fixing methods can also be used.

[0038] One end of the side rod 4 is rotatably installed on the central rod 3 around an axis extending in the horizontal direction. The other end of the side rod 4 is connected with a scraping blade 1. When the side rod 4 rotates to a vertical state, the other end of the side rod 4 is located in the container 6, and the scraping blade 1 on the central rod 3 and the scraping blade 1 on the side rod 4 are located on the same straight line. When the side rod 4 rotates to a horizontal state, the whole side rod 4 is located outside the container 6.

[0039] When the inner diameter of the container 6 is small, the side rod 4 can not be used or a smaller number of side rods 4 can be used. When the inner diameter of the container 6 is large, the side rods 4 that need to participate in spreading the powder are rotated into the container 6, and the side rods 4 that do not need to participate in spreading the powder are rotated to positions outside the container 6. In this embodiment, there are two side rods 4 and they are symmetrically located on both sides of the central rod 3.

[0040] The sizes of the scraping blades 1 on the central rod 3 and the side rods 4 can be the same or different. Even the scraping blades on different side rods 1 can be the same or different. In short, whether the side rod 4 participates in spreading the powder depends on the inner diameter of the container 6. It is best that when the central rod 3 rotates 360°, the scraping blade 1 just completes the powder spreading on the circular plane in the container 6 accordingly, that is, the powder spreading is completed at one time.

[0041] The powder spreading mechanism further includes a support rod 5 extending in the horizontal direction. The support rod 5 can be pressed against the container mouth of the container 6 for containing powder materials to realize the vertical positioning of the whole powder spreading mechanism. The support rod 5 can be telescopic along its length direction so that the support rod 5 can support on containers 6 with different diameters. Such as Figure 5As shown in the figure, in this embodiment, the support rod 5 includes at least two sleeves 51 sleeved in sequence. Relative displacement can occur axially between two adjacent sleeves 51, and pull tabs 52 are provided on both of the two sleeves 51 at the outermost ends. An operator applies force to the pull tabs 52 to facilitate pushing and pulling the sleeves 51 to achieve the telescoping of the support rod 5. The sleeves 51 can be conical to prevent two adjacent sleeves 51 from separating.

[0042] A first tooth portion 53 is provided on the support rod 5, and a strip-shaped groove 31 extending vertically is provided on the central rod 3. A first rack 32 extending vertically is provided in the strip-shaped groove 31. The first tooth portion 53 can be detachably embedded in different tooth grooves of the first rack 32, so as to realize the detachable connection between the central portion of the support rod 5 and the central rod 3, and further realize that the support rod 5 can be positioned at different heights of the central rod 3, so as to adjust the position of the support rod 5 relative to the central rod 3, change the distance between the scraper 1 on the central rod 3 and the bottom wall of the container 6, and make the scraper 1 in the thickness position of the loose powder, so as to adapt to the leveling of powders with different thicknesses.

[0043] Preferably, the first rack 32 is made of a flexible material, such as a rubber part. The first tooth portion 53 is triangular or serrated. Correspondingly, the tooth grooves of the first rack 32 are also triangular or serrated. The first tooth portion 53 is slightly larger than the first tooth groove, so that sliding can occur between the two and positioning can be achieved after sliding in place. The first rack 32 of this embodiment is adhesively bonded in the strip-shaped groove 31. Of course, the first rack 32 can also be fixed in other ways.

[0044] The side rod 4 includes a positioning rod 41 and a sliding rod 42. One end of the positioning rod 41 is rotatably installed on the central rod 3 around an axis extending in the horizontal direction, that is, the positioning rod 41 can rotate relative to the central rod 3, and the rotation axis extends in the horizontal direction, so that the whole side rod 4 can swing up and down.

[0045] A chute 43 is provided on the positioning rod 41 along its length direction. The chute 43 penetrates through the other end of the positioning rod 41. A sliding rod 42 capable of moving along its length direction is provided in the chute 43. One end of the sliding rod 42 is detachably connected to the chute 43, and the other end of the sliding rod 42 extends out of the chute 43 and is connected to the scraper 1. The extending length of the sliding rod 42 can be adjusted according to the thickness of the powder, so that the scraper 1 is in the thickness position of the loose powder.

[0046] Such as Figure 3 、 9As shown, a second tooth portion 421 is provided on the sliding rod 42, and a second rack 44 extending along its length direction is provided in the sliding groove 43. The second tooth portion 421 is detachably embedded in different tooth grooves of the second rack 44. Preferably, the second rack 44 is made of a flexible material, such as a rubber part. The second tooth portion 421 is triangular or serrated. Correspondingly, the tooth grooves of the second rack 44 are also triangular or serrated. The second tooth portion 421 is slightly larger than the second tooth groove, so that sliding can occur between the two and positioning can be achieved after the sliding is in place.

[0047] In this embodiment, the second rack 44 is adhesively bonded in the sliding groove 43. Of course, the second rack 44 can also be fixed in other ways.

[0048] Such as Figure 1 、 8 As shown, the sliding rod 42 and the scraper 1 are connected by a mounting block 45. The mounting block 45 can rotate relative to the sliding rod 42, and the rotation axis of the mounting block 45 extends in a direction perpendicular to the axis of the sliding rod 42. That is to say, if the sliding rod 42 is in a vertically extended state, the rotation axis of the mounting block 45 extends in the horizontal direction. If the sliding rod 42 is in a horizontally extended state, the rotation axis of the mounting block 45 extends in the vertical direction. When the side rod 4 is in the container 6, the scraper 1 on it is not in a vertical position, that is, the powder-receiving surface of the scraper 1 does not face the powder. At this time, the mounting block 45 can be rotated so that the scraper 1 is in a vertical position.

[0049] In this embodiment, the second magnetic member 2 corresponding to the scraper 1 on the side rod 4 is mounted on the mounting block 45 by an adhesive method.

[0050] It should be noted here that the connection structure between the mounting block 45 and the sliding rod 42 and the connection structure between the positioning rod 41 and the central rod 3 can both adopt existing hinge structures. For example, on a laptop computer, the connection structure between the display screen and the main body, or the connection structure between the upper baking tray and the lower baking tray in the Chinese utility model patent "Barbecue Machine" with the patent publication number CN208491829U. By adopting such connection structures, not only can the mounting block 45 and the positioning rod 41 rotate, but also positioning can be achieved after the rotation is in place.

[0051] The powder spreading effect of the powder spreading mechanism of this embodiment is verified through the following two tests:

[0052] Test 1:

[0053] Only the scraper 1 on the central rod 3 participates in leveling the powder, and the scraper 1 on the side rod 4 does not participate in leveling the powder. The side rod 4 is in a horizontal state outside the container 6, as Figure 10 shown.

[0054] This test prepares For the PZT-8 green compact of [[[dimension]]], since the inner cavity dimension of the container 6 used is 15.2 mm, after calculation, the scraper 1 on the central rod 3 is adjusted to a position 3 mm away from the bottom wall surface of the container 6. The left end of the scraper 1 on the central rod 3 is aligned with its corresponding second magnetic member 2, and the one-time powder spreading area reaches 95% of the inner cavity of the container 6.

[0055] Experiment 2:

[0056] Only the scraper 1 on the central rod 3 and the scraper 1 on one of the side rods 4 are involved in leveling the powder, and the scraper 1 on the other side rod 4 does not participate in leveling the powder. This side rod 4 is in a horizontal state outside the container 6, as Figure 11 shown.

[0057] This experiment prepares For the PZT-8 green compact of [[[dimension]]], since the inner cavity dimension of the container 6 used is 50 mm, after calculation, the scraper 1 on the central rod 3 is adjusted to a position 3 mm away from the bottom wall surface of the container 6. The left end of the scraper 1 on the central rod 3 is aligned with its corresponding second magnetic member 2, and the right end of the scraper 1 on the side rod 4 is aligned with the second magnetic member 2 on the corresponding mounting block 45. The two scrapers 1 are on the same straight line, so that the one-time powder spreading area reaches 95% of the inner cavity of the container 6.

[0058] In the description of the present invention, it should be understood that in the description of this invention patent, unless otherwise specified, "a plurality of" means two or more. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "front", "rear", etc. is based on the direction or positional relationship shown in the drawings. It is only for the convenience of describing this invention patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this invention patent.

[0059] In the description of this invention patent, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an adhesive connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this invention patent can be understood according to specific situations.

[0060] The technical solution of the present invention will be further described in detail below in conjunction with the embodiments of the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. A powder spreading mechanism for spreading piezoelectric ceramic powder, used for spreading powder in a container (6), characterized in that: The invention comprises a rod body which can be in a vertical state and a scraper (1) connected to the first end of the rod body, wherein the first end of the rod body can be extended into a container (6) so that the scraper (1) can flatten the powder, and the rod body can rotate around an axis extending vertically. When the rod body is in a rotating state, the side wall surface of the scraper (1) facing the powder is called a material-facing surface, and the scraper (1) is provided with a groove (11) penetrating the material-facing surface, and the material-facing surface has a plane (12) located beside the groove.

2. The powder spreading mechanism according to claim 1, characterized in that: A straight line vertically passing through the central part of the scraper (1) is used as a dividing line, and the groove (11) and the plane (12) are symmetrically located on both sides of the dividing line.

3. The powder spreading mechanism according to claim 1, characterized in that: The scraper (1) can move in a direction perpendicular to the axis of the rod body.

4. The powder spreading mechanism according to claim 3, characterized in that: The scraper (1) is provided with a first magnetic part (13), and the rod body is provided with a second magnetic part (2) that can magnetically cooperate with the first magnetic part (13), and the first magnetic part (13) and / or the second magnetic part (2) extend in a direction perpendicular to the axis of the rod body.

5. The powder spreading mechanism according to any one of claims 1 to 4, characterized in that: The rod bodies have at least two rods, one of which is always in a vertical state and is referred to as a central rod (3). The lower end of the central rod (3) is connected to a scraper (1). The other rod bodies are referred to as side rods (4). One end of the side rod (4) is rotatably mounted on the central rod (3). The rotation axis of the side rod (4) extends in a horizontal direction. The other end of the side rod (4) is connected to a scraper (1). When the side rod (4) is rotated to a vertical state, the other end of the side rod (4) is located in the container (6), and the scraper (1) on the central rod (3) and the scraper (1) on the side rod (4) are located on the same straight line. When the side rod (4) is rotated to a horizontal state, the side rod (4) is located outside the container (6) as a whole.

6. The powder spreading mechanism according to claim 5, characterized in that: The container further comprises a support rod (5) extending in the horizontal direction, the support rod (5) being capable of being retracted and contracted in the length direction thereof, the support rod (5) being capable of being pressed against the container mouth of the container (6), the central portion of the support rod (5) being detachably connected to the center rod (3), and the support rod (5) being capable of being positioned at different heights of the center rod (3).

7. The powder spreading mechanism according to claim 6, characterized in that: The support rod (5) is provided with a first tooth portion (53), and the central rod (3) is provided with a first rack (32) extending vertically therefrom. The first tooth portion (53) is detachably embedded in different tooth grooves of the first rack (32).

8. The powder spreading mechanism according to claim 5, characterized in that: The side rod (4) comprises a positioning rod (41) and a sliding rod (42). One end of the positioning rod (41) is rotatably mounted on the center rod (3), and the rotation axis of the positioning rod (41) extends in the horizontal direction. A sliding groove (43) is provided on the positioning rod (41) along its length direction. The sliding groove (43) passes through the other end of the positioning rod (41). A sliding rod (42) that can move along its length direction is provided in the sliding groove (43). One end of the sliding rod (42) is detachably connected to the sliding groove (43), and the other end of the sliding rod (42) extends out of the sliding groove (43) and is connected to the scraper (1).

9. The powder spreading mechanism according to claim 8, characterized in that: The slide bar (42) is provided with a second tooth portion (421), the slide groove (43) is provided with a second rack (44) extending along its length direction, and the second tooth portion (421) is detachably embedded in different tooth grooves of the second rack (44).

10. The powder spreading mechanism according to claim 8, characterized in that: The slide bar (42) and the scraper (1) are connected via a mounting block (45). The mounting block (45) can rotate relative to the slide bar (42), and the rotation axis of the mounting block (45) extends in a direction perpendicular to the axis of the slide bar (42).

Images