Powder spreading device for dry-method electrode powder and powder spreading hot-pressing equipment

Abstract

The utility model relates to the technical field of solid-state battery manufacturing, in particular to a powder spreading device for dry-method electrode powder and powder spreading hot-pressing equipment. The powder spreading device comprises a base, a powder spreading base table, a powder spreading rolling device, a feeding device and a supporting structure. The powder laying base table is arranged in the center of the base, a supporting structure is arranged on the base, and the powder laying rolling device is arranged above the powder laying base table after being fixedly connected with the supporting structure. The feeding device is fixedly connected with the supporting structure and arranged above one end of the powder laying base table. The electrode material is laid on the current collector laid on the powder laying base table through the feeding device, the electrode material is evenly laid and pressed at higher precision through the powder laying rolling device, and the performance of an electrode manufactured through a dry method is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solid-state battery manufacturing, and in particular to a powder spreading device and powder spreading hot pressing equipment. Background Art

[0002] Dry electrode manufacturing refers to the manufacture of electrodes by directly processing powder materials. This method can improve production efficiency, reduce costs, and reduce environmental impact.

[0003] Among them, powder spreading refers to evenly spreading the electrode material powder on the current collector. During the powder spreading process, it is necessary to ensure that the thickness and uniformity of the spreading meet the standards to ensure that the manufactured electrode has the expected performance.

[0004] However, existing powder spreading devices have problems such as insufficient laying accuracy and uneven electrode material powder. Utility Model Content

[0005] The utility model provides a powder spreading device and powder spreading hot pressing equipment for dry electrode powder, so as to solve the problems of insufficient laying accuracy and uneven electrode material powder in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0007] In a first aspect, an embodiment of the utility model provides a powder spreading device for dry electrode powder, comprising:

[0008] Base, powder spreading platform, powder spreading roller pressing device, feeding device and supporting structure. The powder spreading platform is arranged at the center of the base, and the supporting structure is arranged on the base. The powder spreading roller pressing device is fixedly connected to the supporting structure and arranged above the powder spreading platform. The feeding device is fixedly connected to the supporting structure and arranged above one end of the powder spreading platform.

[0009] In some possible implementations, the powder-laying base includes: a powder-laying platform and two residual material recovery boxes. The length of the powder-laying platform and the length of the residual material recovery box are the same as the base. The two residual material recovery boxes are symmetrically arranged on both sides of the powder-laying platform, one end of the residual material recovery box is fixedly connected to the powder-laying platform, and the other end of the residual material recovery box is fixedly connected to the base.

[0010] In some possible implementations, the feeding device includes: a hopper, a stirring roller, a discharge roller, a stirring roller motor and a discharge roller motor; the stirring roller motor is arranged on the first side plate of the hopper, one end of the stirring roller is connected to the stirring roller motor power, and the other end passes through the first side plate and is connected to the bearing arranged on the second side plate of the hopper; the discharge roller motor is arranged on the first side plate of the hopper, one end of the discharge roller is connected to the discharge roller motor power, and the other end passes through the first side plate and is connected to the bearing arranged on the second side plate of the hopper, and the discharge roller motor and the discharge roller are arranged below the stirring roller motor and the stirring roller.

[0011] In some possible implementations, the powder spreading roller pressing device includes: at least one pressing roller assembly, a pressing roller adjustment assembly and a support platform; the pressing roller assembly is arranged below the support platform, and the pressing roller adjustment assembly is arranged above the support platform, opposite to the pressing roller assembly.

[0012] In some possible implementations, the pressure roller assembly includes: a powder spreading roller, a powder spreading roller motor, a connecting frame, and a powder scraper plate; the powder spreading roller motor is arranged on the third side plate of the connecting frame, one end of the powder spreading roller is connected to the power of the powder spreading roller motor, and the other end passes through the third side plate and is connected to the bearing arranged on the fourth side plate of the connecting frame; the powder scraper plate is fixedly connected to the connecting frame, and one side of the powder scraper plate is in contact with the powder spreading roller.

[0013] In some possible implementations, the pressure roller adjustment assembly includes: at least 2 spring adjusters and 2 digital micrometers; the spring adjuster and the digital micrometer are passed through the support platform and fixedly connected to the support platform, and the spring adjuster and the digital micrometer are respectively arranged at both ends of the pressure roller assembly; one end of the spring adjuster is fixedly connected to the top plate of the connecting frame; one end of the digital micrometer is abutted against the top plate of the connecting frame.

[0014] In some possible implementations, when there are two pressing roller assemblies, the two pressing roller assemblies are arranged in sequence facing the powder spreading direction; the powder spreading roller of the pressing roller assembly arranged in front is a pattern roller, and the powder spreading roller of the pressing roller assembly arranged in the back is a smooth roller.

[0015] In some possible implementations, transmission devices are provided at both ends of the base for driving the material to be powdered to move along the powdering direction.

[0016] In some possible implementations, a negative pressure powder collecting assembly is provided at one end of the residual material recovery box connected to the base.

[0017] In a second aspect, an embodiment of the present application provides a powder spreading and hot pressing device, and the powder spreading and hot pressing device includes the powder spreading device provided in the first aspect.

[0018] The beneficial effects of the utility model are as follows: the electrode material is laid on the current collector laid on the powder laying base through the feeding device, and the electrode material is laid and pressed uniformly with higher precision through the powder laying roller pressing device, thereby improving the performance of the electrode manufactured by the dry method. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a powder spreading device provided in one embodiment of the present application;

[0020] Figure 2 An exploded view of a powder spreading device provided in one embodiment of the present application;

[0021] Figure 3A schematic diagram of the structure of a powder-laying base provided in one embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of a feeding device provided in one embodiment of the present application;

[0023] Figure 5 A schematic structural diagram of a powder spreading roller pressing device provided in an embodiment of the present application;

[0024] Figure 6 A side view of a powder spreading roller pressing device provided in one embodiment of the application;

[0025] Figure 7 A side view of a pattern roller in a pressure roller assembly provided in one embodiment of the application.

[0026] In the figure: 100-powder spreading device; 11-base; 12-powder spreading base; 121-powder spreading platform; 122-residue material recovery box; 13-powder spreading roller pressing device; 131-pressing roller assembly; 1311-powder spreading roller; 1312-powder spreading roller motor; 1313-powder scraping plate; 1314-third side plate; 1315-fourth side plate; 1316-top plate; 132-support platform; 133-pressing roller adjustment assembly; 1331-spring adjuster; 1332-digital display Micrometer; 1333-spring baffle; 1334-rectangular spring; 1335-linear bearing; 14-feeding device; 141-hopper; 1411-first side plate; 1412-second side plate; discharge port-1413; 142-stirring roller; 1421-stirring part; 143-discharge roller; 1431-discharge trough; 144-stirring roller motor; 145-discharge roller motor; 15-support structure; 151-first connecting piece; 152-second connecting piece. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the process of manufacturing electrodes by dry method, the raw materials of electrode materials are powders, which include a variety of substances, such as active substances, conductive agents, binders, etc. The powder particle size ranges from 40 nanometers to 10 microns. The particle size is small, the powder is light, the fluidity is poor, it is easy to stick, and it is easy to stick to the roller during the powder spreading process. When spreading the electrode material powder on the current collector, it needs to be sufficiently uniform (the height difference is within 10 microns). However, due to the uneven distribution of powder particle size and poor powder spreading uniformity, it is more difficult to spread the powder directly.

[0034] In this regard, the present application provides a powder spreading device for dry electrode powder. Figure 1 A schematic diagram of the structure of a powder spreading device provided in one embodiment of the present application; Figure 2 An exploded view of a powder spreading device provided in one embodiment of the present application.

[0035] In some embodiments, reference Figure 1 and Figure 2 , a powder spreading device 100, comprising:

[0036] Base 11, powder spreading platform 12, powder spreading roller pressing device 13, feeding device 14 and supporting structure 15. Powder spreading platform 12 is arranged at the center of base 11, supporting structure 15 is arranged on base 11, powder spreading roller pressing device 13 is arranged above powder spreading platform 12 after being fixedly connected with supporting structure 15. Feeding device 14 is fixedly connected with supporting structure 15 and arranged above one end of powder spreading platform 12.

[0037] In some possible implementations, the base 11 may be made of a material with a certain weight and is flat, such as marble. The powder-laying base 12 may be made of the same material as the base 11, and the base 11 and the powder-laying base 12 may be integral or separable. The specific structure of the support structure 15 may be adjusted according to actual conditions, and the present application does not limit the specific form of the support structure 15. A first connecting member 151 and a plurality of second connecting members 152 are provided on the support structure 15. The first connecting member 151 is used to be fixedly connected to the feeding device 14, and the plurality of second connecting members 152 are used to be fixedly connected to the powder-laying roller pressing device 13.

[0038] The feeding device 14 is used to stir the electrode material contained therein, ensure that the electrode material powder is stirred evenly, and then feed the electrode material powder onto the current collector carried by the powder spreading base 12 .

[0039] The powder spreading roller pressing device 13 can finely adjust the distance between it and the powder spreading base 12, and roll the electrode material powder on the current collector to make it evenly spread on the current collector.

[0040] The beneficial effects of this embodiment are: the electrode material is laid on the current collector laid on the powder-laying base through the feeding device, and the electrode material is laid and pressed evenly with higher precision through the powder-laying roller pressing device, thereby improving the performance of the electrode manufactured by the dry method.

[0041] Figure 3 A schematic structural diagram of a powder-laying base provided in one embodiment of the present application.

[0042] For some possible implementations, refer to Figure 3 The powder spreading base 12 includes: a powder spreading platform 121 and two residual material recovery boxes 122. The length of the powder spreading platform 121 and the length of the residual material recovery box 122 are the same as those of the base 11. The two residual material recovery boxes 122 are symmetrically arranged on both sides of the powder spreading platform 121, one end of the residual material recovery box 122 is fixedly connected to the powder spreading platform 121, and the other end of the residual material recovery box 122 is fixedly connected to the base 11.

[0043] The powder-laying base 121 is used to carry the material to be laid (such as a current collector), and the residual material recovery box 122 is used to recover the excess electrode material powder after laying. Figure 3 As shown, after one end of the residual material recovery box 122 is fixedly connected to the powder spreading platform 121 , it can extend to the base 11 at a certain angle with the powder spreading platform 121 , and then continue to extend along the base 11 , and be fixedly connected to the base 11 along the portion of the base 11 .

[0044] In some possible implementations, a negative pressure powder collection component is provided at one end of the residual material recovery box 122 connected to the base 11. As an example, the negative pressure powder collection component can be an exhaust fan, for example, the exhaust fan is connected to the collection box through an air duct, the collection box is covered at the fixed connection part between the residual material recovery box 122 and the base 11, and a filter is provided at the connection between the collection box and the air duct, so that the electrode material powder in the residual material recovery box 122 can be collected into the collection box by the exhaust fan.

[0045] In some possible implementations, transmission devices are provided at both ends of the base 11 to drive the material to be spread along the spreading direction. As an example, the transmission device can be a conveyor belt or a winder. For example, when the transmission device is a winder, one end is used to place the rolled material to be spread, and the other end is used to roll the material to be spread, so that the material to be spread is rolled along the spreading direction.

[0046] Figure 4 A schematic structural diagram of a feeding device provided in one embodiment of the present application.

[0047] For some possible implementations, refer to Figure 4 The feeding device 14 includes: a hopper 141, a stirring roller 142, a discharge roller 143, a stirring roller motor 144 and a discharge roller motor 145; the stirring roller motor 144 is arranged on the first side plate 1411 of the hopper 141, one end of the stirring roller 142 is connected to the stirring roller motor 144 by power, and the other end passes through the first side plate 1411 and is connected to a bearing arranged on the second side plate 1412 of the hopper 141; the discharge roller motor 145 is arranged on the first side plate 1411 of the hopper 141, one end of the discharge roller 143 is connected to the discharge roller motor 145 by power, and the other end passes through the first side plate 1411 and is connected to a bearing arranged on the second side plate 1412 of the hopper 141, and the discharge roller motor 145 and the discharge roller 143 are arranged below the stirring roller motor 144 and the stirring roller 142.

[0048] As an example, the stirring roller motor 144 and the feeding roller motor 145 can be reduction motors. A stirring portion 1421 can be provided on the stirring roller 142, and the stirring portion 1421 can be an arc-shaped protrusion along the surface of the stirring roller 142. The stirring roller motor 144 drives the stirring roller 142 to rotate in the hopper 141, so that the material in the hopper can be stirred more evenly, and the stratification of the electrode material powder caused by different particle sizes can be prevented. The hopper 141 is fixedly connected to the support structure 15 through the first connecting member 151.

[0049] The unloading roller 143 can be arranged at the bottom of the hopper 141, with a part of it being located in the hopper 141 and the other part passing through the unloading port 1413 to block the unloading port 1413. A plurality of unloading troughs 1431 matching the unloading port 1413 can be arranged on the unloading roller 143. The unloading troughs 1431 of the part of the unloading roller 143 located in the hopper 141 contain electrode material powder. When the unloading roller 143 is driven to rotate by the unloading roller motor 145, if the unloading trough 1431 rotates to the outside of the unloading port 1413, the electrode material powder contained in the unloading trough 1431 will fall onto the material to be spread under the feeding device 14, thus completing the feeding.

[0050] Figure 5 A schematic diagram of the structure of a powder spreading roller pressing device provided in one embodiment of the present application.

[0051] For some possible implementations, refer to Figure 5 The powder spreading roller pressing device 13 includes: at least one pressing roller assembly 131, a pressing roller adjustment assembly 133 and a supporting platform 132; the pressing roller assembly 131 is arranged below the supporting platform 132, and the pressing roller adjustment assembly 133 is arranged above the supporting platform 132, and is arranged opposite to the pressing roller assembly 131.

[0052] The support platform 132 is fixedly connected to the support structure 15 via a plurality of second connectors 152. The roller adjustment assembly 133 is used to adjust the height and level of the roller assembly 131 so that the gap between the roller assembly 131 and the powder paving base 12 meets the paving accuracy requirements.

[0053] The pressing roller assembly 131 is used to evenly spread the electrode material powder accumulated on the material to be spread on the material to be spread.

[0054] Figure 6 A side view of a powder spreading roller pressing device provided in one embodiment of the application.

[0055] For some possible implementations, refer to Figure 6The pressure roller assembly 131 includes: a powder spreading roller 1311, a powder spreading roller motor 1312, a connecting frame, and a powder scraper plate 1313; the powder spreading roller motor 1312 is arranged on the third side plate 1314 of the connecting frame, one end of the powder spreading roller 1311 is connected to the powder spreading roller motor 1312, and the other end passes through the third side plate 1314 and is connected to the bearing arranged on the fourth side plate 1315 of the connecting frame; the powder scraper plate 1313 is fixedly connected to the connecting frame, and one side of the powder scraper plate 1313 abuts against the powder spreading roller 1311.

[0056] As an example, the powder spreading roller motor 1312 may be a reduction motor, which is used to drive the powder spreading roller 1311 to rotate. The third side plate 1314 and the fourth side plate 1315 can block the electrode material powder from spreading during the powder spreading process, thereby controlling dust.

[0057] The scraper plate 1313 may be made of metal, polyurethane (PU) and other materials. The scraper plate 1313 may include a fixed plate, a scraper plate and a connecting plate. At least two fixed connection holes are provided on the fixed plate, the scraper plate and the connecting plate respectively. One end of the connecting plate is fixedly connected to the third side plate 1314, and the other end is fixedly connected to the fourth side plate 1315. The fixed plate fixes the scraper plate to the connecting plate through a fixed connector (such as a screw), and the scraper plate abuts against the powder spreading roller 1311 to scrape off the electrode material powder adsorbed on the powder spreading roller 1311. The length of the scraper plate may be greater than or equal to the width of the powder spreading roller 1311.

[0058] In some possible implementations, the pressure roller adjustment assembly 133 includes: at least two spring adjusters 1331 and two digital micrometers 1332; the spring adjuster 1331 and the digital micrometer 1332 are passed through the support platform 132 and fixedly connected to the support platform 132, and the spring adjuster 1331 and the digital micrometer 1332 are respectively arranged at both ends of the pressure roller assembly 131; one end of the spring adjuster 1332 is fixedly connected to the top plate 1316 of the connecting frame; one end of the digital micrometer 1332 is abutted against the top plate 1316 of the connecting frame.

[0059] The spring adjuster 1331 includes a spring stopper 1333, a rectangular spring 1334, and a linear bearing 1335. The linear bearing 1335 passes through the support platform 132 and is fixedly connected to the support platform 132. One end of the linear bearing 1335 is fixedly connected to the top plate 1316 of the connecting frame. After the rectangular spring 1334 is sleeved on the other end of the linear bearing 1335, a spring stopper 1333 is provided on the other end of the linear bearing 1335. One end of the rectangular spring 1334 abuts against the spring stopper 1333, and the other end abuts against the supporting platform 132. The spring stopper 1333 is screwed with the linear bearing 1335. When the spring stopper 1333 rotates, the force applied to the linear bearing 1335 will be increased or decreased, so that the extension and contraction degree of the linear bearing 1335 will change, thereby driving the connecting frame to move up and down.

[0060] One end of the digital micrometer 1332 is a display end, and the other end is a measuring end. The display end is fixedly connected to the support platform 132 through a fixed connector, and the measuring end passes through the support platform 132 and abuts against the top plate 1316 of the connection frame, thereby displaying the distance between the top plate 1316 of the connection frame and the support platform 132 on the display end. When the connection frame is displaced by the spring adjuster 1331, the length of the measuring end will also change, and the distance value displayed on the display end will also change. In this embodiment, since a micrometer is used as a measuring instrument, the accuracy of adjusting the height of the pressure roller assembly 131 can reach the measurement accuracy of the micrometer, that is, 0.01 mm (10 microns), thereby achieving a powder spreading accuracy of 10 microns.

[0061] In some possible implementations, when there are two pressing roller assemblies 131, the two pressing roller assemblies are arranged in sequence facing the powder spreading direction. The powder spreading roller 1311 of the pressing roller assembly 131 arranged in front is a pattern roller, and the powder spreading roller 1311 of the pressing roller assembly 131 arranged in the back is a smooth roller.

[0062] Figure 7 A side view of a pattern roller in a pressure roller assembly provided in one embodiment of the application.

[0063] For some possible implementations, refer to Figure 7 The patterned roller is provided with patterns so that the electrode material powder accumulated on the material to be spread can be quickly dispersed to the position where it needs to be spread on the material to be spread. The smooth roller of the other pressing roller assembly 131 can press the electrode material powder that has been scattered on the material to be spread evenly, so that the electrode material powder is evenly spread on the material to be spread.

[0064] In other examples, the workflow of laying electrode material powder on the material to be powdered by a powder laying device is as follows.

[0065] First, use the spring adjuster 1331 to adjust the powder spreading roller 1311, and ensure that each powder spreading roller 1311 is parallel to the powder spreading base 12 and the spacing meets the laying requirements through the readings on the digital micrometer 1332.

[0066] Then, the electrode material powder is added into the hopper 141, and the stirring roller motor 144 is started to drive the stirring roller 142 to rotate to ensure that the electrode material powder is evenly mixed.

[0067] Next, the material to be spread is moved along the spreading direction on the powder spreading base 12 through the transmission device, and the unloading roller motor 145 is started to drive the unloading roller 143 to rotate, so that the electrode material powder falls on the material to be spread.

[0068] Finally, the powder spreading roller motor 1312 is started to drive the powder spreading roller 1311 to rotate, and the electrode material powder on the material to be spread is pressed evenly to complete the powder spreading.

[0069] In some possible implementations, the present application further provides a powder spreading and hot pressing device, which includes the powder spreading device provided by any of the above embodiments.

[0070] It should be noted that in this application, circuits, controllers, etc., which can be determined without doubt by those skilled in the art, are not described in detail. Those skilled in the art can obtain specific implementation plans without doubt based on the contents of this application.

[0071] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A powder spreading device for dry electrode powder, characterized in that: include: Base, powder spreading base, powder spreading roller pressing device, feeding device and supporting structure; The powder spreading base is arranged at the center of the base, a supporting structure is arranged on the base, and the powder spreading roller pressing device is fixedly connected to the supporting structure and arranged above the powder spreading base; The feeding device is fixedly connected to the supporting structure and is arranged above one end of the powder spreading base.

2. The powder spreading device according to claim 1, characterized in that: The powder-laying base comprises: Powder laying platform, two waste material recovery boxes; The length of the powder spreading platform and the length of the residual material recovery box are the same as that of the base; The two residual material recovery boxes are symmetrically arranged on both sides of the powder spreading platform, one end of the residual material recovery box is fixedly connected to the powder spreading platform, and the other end of the residual material recovery box is fixedly connected to the base.

3. The powder spreading device according to claim 2, characterized in that: The feeding device comprises: Hopper, stirring roller, feeding roller, stirring roller motor and feeding roller motor; The stirring roller motor is arranged on the first side plate of the hopper, one end of the stirring roller is connected to the stirring roller motor power, and the other end passes through the first side plate and is connected to the bearing arranged on the second side plate of the hopper; The feed roller motor is arranged on the first side plate of the hopper, one end of the feed roller is connected to the feed roller motor power, and the other end passes through the first side plate and is connected to the bearing arranged on the second side plate of the hopper, and the feed roller motor and the feed roller are arranged below the stirring roller motor and the stirring roller.

4. The powder spreading device according to claim 3, characterized in that: The powder spreading roller pressing device comprises: at least one pressure roller assembly, a pressure roller adjustment assembly, and a support platform; The pressure roller assembly is arranged below the support platform, and the pressure roller adjustment assembly is arranged above the support platform and is arranged opposite to the pressure roller assembly.

5. The powder spreading device according to claim 4, characterized in that: The pressure roller assembly comprises: Powder spreading roller, powder spreading roller motor, connecting frame, powder scraper; The powder spreading roller motor is arranged on the third side plate of the connecting frame, one end of the powder spreading roller is connected to the power of the powder spreading roller motor, and the other end passes through the third side plate and is connected to the bearing arranged on the fourth side plate of the connecting frame; The powder scraping plate is fixedly connected to the connecting frame, and one side of the powder scraping plate abuts against the powder spreading roller.

6. The powder spreading device according to claim 5, characterized in that: The pressure roller adjustment assembly comprises: At least 2 spring adjusters, 2 digital dial indicators; The spring regulator and the digital dial gauge are disposed through the support platform and are fixedly connected to the support platform, and the spring regulator and the digital dial gauge are respectively disposed at two ends of the pressure roller assembly; One end of the spring adjuster is fixedly connected to the top plate of the connecting frame; One end of the digital micrometer is in contact with the top plate of the connecting frame.

7. The powder spreading device according to any one of claims 4 to 6, characterized in that: When there are two pressing roller assemblies, the two pressing roller assemblies are arranged in sequence facing the powder spreading direction; The powder spreading roller of the pressing roller assembly arranged in the front is a pattern roller, and the powder spreading roller of the pressing roller assembly arranged in the back is a smooth roller.

8. The powder spreading device according to any one of claims 1 to 6, characterized in that: Transmission devices are arranged at both ends of the base for driving the material to be spread with powder to move along the spreading direction.

9. The powder spreading device according to any one of claims 2 to 6, characterized in that: One end of the residual material recovery box connected to the base is provided with a negative pressure powder collecting component.

10. A powder spreading hot pressing device, characterized in that: The powder spreading and hot pressing equipment comprises the powder spreading device according to any one of claims 1-9.

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