Powder feeding device and dry coating equipment

Abstract

The utility model provides a powder feeding device and dry coating equipment. The powder feeding device comprises a feeding mechanism, a rolling mechanism and a material stirring mechanism, the feeding mechanism comprises a stock bin, and the stock bin is provided with a discharging port; the rolling mechanism comprises a first roller and a second roller which are arranged in parallel, and a roller gap corresponding to the discharge port is formed between the first roller and the second roller; the material stirring mechanism comprises a roller gap material stirring piece, and the roller gap material stirring piece can conduct linear reciprocating stirring on materials at the roller gap in the length direction of the first roller and the second roller. According to the powder feeding device, the feeding uniformity of the rolling mechanism can be improved, and the problems of difficult film forming, non-uniform film forming, film perforation and the like of a dry coating technology are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a powder feeding device and dry coating equipment. Background Art

[0002] In dry coating technology, powdered materials are introduced into the roller gap (the gap between two rollers arranged in parallel) of the roller pressing mechanism through a feeding mechanism, and are rolled by the roller pressing mechanism to form film-like materials. However, in the related technology, the roller pressing mechanism has the problem of uneven feeding of materials, which easily leads to problems such as difficulty in film formation, uneven film formation, and film perforation in dry coating technology. Utility Model Content

[0003] The utility model provides a powder feeding device, which aims to improve the feeding uniformity of a roller pressing mechanism and improve the problems of difficult film formation, uneven film formation, film perforation, etc. in dry coating technology.

[0004] The utility model provides a powder feeding device, comprising:

[0005] A feeding mechanism, comprising a silo, wherein the silo has a discharge port;

[0006] A rolling mechanism, comprising a first roller and a second roller arranged in parallel, wherein a roller gap corresponding to the discharge port is formed between the first roller and the second roller; and

[0007] The material shifting mechanism comprises a roller gap material shifting member, and the roller gap material shifting member can perform linear reciprocating stirring on the material at the roller gap along the length direction of the first roller and the second roller.

[0008] In one embodiment, the roll gap material shifting member can also move toward or away from the roll gap to adjust the depth of the roll gap material shifting member inserted into the material located at the roll gap.

[0009] In one embodiment, it also includes a lifting mechanism disposed on the material bin, and the roller gap material shifting member is disposed on the lifting mechanism.

[0010] In one embodiment, it further comprises a heating mechanism with adjustable heating temperature, and the heating mechanism is arranged on the side wall of the silo.

[0011] In one embodiment, it further comprises a heat insulation mechanism, wherein the heat insulation mechanism is arranged on a side of the heating mechanism away from the inner wall of the silo; and / or

[0012] The silo includes a vertical plate and an inclined plate inclined relative to the vertical plate. In the vertical direction, the discharge port is located at a point where the distance between the inclined plate and the vertical plate is the smallest. Both the vertical plate and the inclined plate are provided with the heating mechanism.

[0013] In one embodiment, the material shifting mechanism further includes an in-bin material shifting member, and the in-bin material shifting member can stir the material in the silo.

[0014] In one embodiment, the material-moving member in the silo can stir the material in the silo in a linear reciprocating manner along the length direction of the first roller and the second roller.

[0015] In one embodiment, the material-discharging mechanism further includes a driving member, which can simultaneously drive the roller gap material-discharging member and the in-bin material-discharging member to perform linear reciprocating stirring along the length direction of the first roller and the second roller.

[0016] In one embodiment, the feeding mechanism also includes a feeding assembly, which includes a feeding bin arranged at the discharge port and a feeding roller rotatably arranged in the feeding bin, the feeding roller having a plurality of feeding troughs arranged at intervals along the circumferential direction, each of the feeding troughs being able to move between a first position and a second position, when the feeding trough is in the first position, the feeding trough is connected to the discharge port, and the material in the bin is introduced into the feeding trough, and when the feeding trough is in the second position, the material in the feeding trough is introduced into the roller gap.

[0017] In one embodiment, the silo includes a vertical plate and an inclined plate arranged obliquely relative to the vertical plate, and in the vertical direction, the point where the distance between the inclined plate and the vertical plate is the smallest is the discharge port;

[0018] The feeding assembly also includes a feeding nozzle arranged on the feeding bin, the inclination and inclination direction of the feeding nozzle are the same as the inclination and inclination direction of the inclined plate, and when the feeding trough is in the second position, the feeding trough is connected to the feeding nozzle, and the material in the feeding trough is introduced into the roller gap through the feeding nozzle.

[0019] In one embodiment, it further comprises a first sensor disposed on the silo, wherein the first sensor is used to detect a material level height of the material in the silo; and / or

[0020] It also includes a second sensor disposed on the silo, and the second sensor is used to detect the material level height of the material at the roller gap.

[0021] In one embodiment, it also includes an automatic width adjustment mechanism, which is used to adjust the length of the material at the roller gap along the length direction of the first roller and the second roller.

[0022] In one embodiment, the automatic width adjustment mechanism includes two width adjustment baffles arranged at intervals, and the width adjustment baffles can reciprocate along the length direction of the first roller and the second roller, and the length of the material at the roller gap is the distance between the two width adjustment baffles.

[0023] The utility model also provides a dry coating device, comprising the above-mentioned powder feeding device.

[0024] When the powder feeding device is working, the powder material in the silo can be introduced into the roller gap between the first roller and the second roller through the discharge port, and rolled by the first roller and the second roller to form a film-like material. During rolling, since the first roller and the second roller are subjected to great force, the roller gap fluctuates in the length direction of the first roller and the second roller (film forming width direction), resulting in inconsistent feeding speed of the rolling mechanism in the film forming width direction when the powder material enters the roller gap (that is, the rolling mechanism has the problem of uneven feeding in the film forming width direction). The powder feeding device is provided with a roller gap material shifter at the roller gap, and the roller gap material shifter can stir the material at the roller gap in a straight line along the length direction of the first roller and the second roller, that is, the roller gap material shifter can stir the material at the roller gap in a straight line along the film forming width direction, thereby eliminating the material unevenness in the film forming width direction, making the rolling mechanism feed the material evenly, and improving the problems of difficult film formation, uneven film formation, and film perforation in the dry coating technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a powder feeding device according to an embodiment of the utility model;

[0026] Figure 2 yes Figure 1 Another schematic structural diagram of the powder feeding device shown. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] like Figure 1 As shown, a powder feeding device 10 provided in one embodiment of the utility model comprises a feeding mechanism 200 , a rolling mechanism 300 and a material shifting mechanism 400 .

[0031] The feeding mechanism 200 includes a silo 210. The silo 210 has a discharge port 210a. The rolling mechanism 300 includes a first roller 300a and a second roller 300b arranged in parallel. A roller gap 300c corresponding to the discharge port 210a is provided between the first roller 300a and the second roller 300b. The material shifting mechanism 400 includes a roller gap material shifting member 410. The roller gap material shifting member 410 can perform linear reciprocating stirring on the material at the roller gap 300c along the length direction of the first roller 300a and the second roller 300b.

[0032] When the powder feeding device 10 is working, the powdered material in the silo 210 can be introduced into the roller gap 300c between the first roller 300a and the second roller 300b through the discharge port 210a, and rolled by the first roller 300a and the second roller 300b to form a film-like material. During rolling, since the first roller 300a and the second roller 300b are subjected to great force, the roller gap 300c fluctuates in the length direction (film forming width direction) of the first roller 300a and the second roller 300b, resulting in that when the powdered material enters the roller gap 300c, the rolling mechanism 300 has inconsistent feeding speed in the film forming width direction (that is, the rolling mechanism 300 has uneven feeding in the film forming width direction). The powder feeding device 10 is provided with a roller gap material shifting member 410 at the roller gap 300c, and the roller gap material shifting member 410 can stir the material at the roller gap 300c linearly and reciprocatingly along the length direction of the first roller 300a and the second roller 300b, that is, the roller gap material shifting member 410 can stir the material at the roller gap 300c linearly and reciprocatingly along the film forming width direction, thereby eliminating the material non-uniformity in the film forming width direction, making the roller pressing mechanism 300 eat the material evenly, and improving the problems of difficulty in film formation, uneven film formation, and film perforation in the dry coating technology.

[0033] In this embodiment, the roller gap material shifting member 410 can also move toward or away from the roller gap 300c to adjust the depth of the roller gap material shifting member 410 inserted into the material located at the roller gap 300c. In this way, it is more convenient for the roller gap material shifting member 410 to effectively stir the material at the roller gap 300c. Moreover, after the powder feeding device 10 works continuously, some viscous materials may accumulate in various parts of the feeding mechanism 200 (for example, the silo 210, the feeding roller shaft 224). At this time, the roller gap material shifting member 410 can be controlled to move away from the roller gap 300c until the feeding mechanism 200 is pulled out in the horizontal direction, and the roller gap material shifting member 410 and the rolling mechanism 300 do not interfere with each other. Then, the feeding mechanism 200 can be manually pulled out horizontally for cleaning and maintenance operations, which is very convenient for cleaning and maintenance operations. It can be understood that in other embodiments, the depth of the roller gap material shifting member 410 inserted into the roller gap 300c can also be fixed.

[0034] In this embodiment, the roll gap material shifting member 410 is a material shifting target. It can be understood that in other embodiments, the specific form of the roll gap material shifting member 410 is not limited to the material shifting target.

[0035] In this embodiment, the roller gap material shifting member 410 is disposed on the material bin 210. In this way, it is very convenient to set the roller gap material shifting member 410. It is understood that in other embodiments, the roller gap material shifting member 410 can also be disposed on the rolling mechanism 300. It is understood that in other embodiments, the roller gap material shifting member 410 can also be an independent structure that has no connection relationship with the material bin 210 and the rolling mechanism 300.

[0036] In this embodiment, the powder feeding device 10 further includes a lifting mechanism 500. The lifting mechanism 500 is disposed on the material bin 210. The roller gap material shifting member 410 is disposed on the lifting mechanism 500. In this way, it is very convenient to realize that the roller gap material shifting member 410 moves toward or away from the roller gap 300c. It can be understood that in other embodiments, when the roller pressing mechanism 300 can move toward or away from the material bin 210, at this time, the lifting mechanism 500 can be omitted, and the roller gap material shifting member 410 can be directly disposed on the material bin 210.

[0037] In the present embodiment, the powder feeding device 10 further includes a heating mechanism 600. The heating mechanism 600 is disposed on the side wall of the silo 210. In this way, the material in the silo 210 can be preheated in advance, so that the material is easier to form a film at the roller pressing mechanism 300, and the film forming quality is greatly improved. Moreover, compared with setting the heating mechanism 600 at the roller pressing mechanism 300, setting the heating mechanism 600 on the side wall of the silo 210 can heat the material more fully and efficiently, thereby solving the problem of insufficient material heating time and greatly improving the film forming quality. It can be understood that in other embodiments, the heating mechanism 600 may not be set on the side wall of the silo 210, but the heating mechanism 600 may be set at the roller pressing mechanism 300. It can be understood that in other embodiments, the heating mechanism 600 may also be set at the side wall of the silo 210 and the roller pressing mechanism 300 at the same time.

[0038] In this embodiment, the heating temperature of the heating mechanism 600 is adjustable. In this way, different temperature parameters can be set according to different materials, and the heating power (heating temperature) of the heating mechanism 600 can be controlled so that the heating power matches the rolling speed of the rolling mechanism 200, thereby solving the problem of uncontrollable heating temperature of the material and greatly improving the film quality. Specifically, the heating temperature of the material can be automatically controlled through information acquisition and control elements such as thermocouples and temperature controllers, and the material temperature and rolling speed can be matched steplessly within a wide range. When there are many material specifications, this function can greatly shorten the debugging cycle and adjust the appropriate temperature parameters in a short time to ensure that the film quality is stable and controllable. It can be understood that in other embodiments, the heating temperature of the heating mechanism 600 can also be fixed.

[0039] In this embodiment, the material-dividing mechanism 400 further includes an in-bin material-dividing member 420. The in-bin material-dividing member 420 can stir the material in the silo 210. In this way, the heat transfer efficiency of the material can be accelerated and the temperature uniformity of the material after heating can be ensured. It can be understood that in other embodiments, when the heat transfer efficiency of the material is very high, the in-bin material-dividing member 420 can be omitted by optimizing the setting mode of the heating mechanism 600 to ensure the temperature uniformity of the material after heating.

[0040] In this embodiment, the material-dividing member 420 in the bin is a material-dividing target. It can be understood that in other embodiments, the specific form of the material-dividing member 420 in the bin is not limited to the material-dividing target.

[0041] In this embodiment, the material shifting member 420 in the bin can stir the material in the bin 210 in a linear reciprocating manner along the length direction of the first roller 300a and the second roller 300b. In this way, the temperature uniformity of the material after heating can be better ensured. It can be understood that in other embodiments, the material shifting member 420 in the bin can also stir the material in the bin 210 in a rotating manner.

[0042] In this embodiment, if Figure 1 and Figure 2 As shown, the material dispensing mechanism 400 further includes a driving member 430. The driving member 430 can simultaneously drive the roller gap dispensing member 410 and the in-bin dispensing member 420 to perform linear reciprocating stirring along the length direction of the first roller 300a and the second roller 300b. In this way, the structure of the above-mentioned powder feeding device 10 is simplified. It can be understood that in other embodiments, two driving members 430 can also be provided, one driving member 430 is used to drive the roller gap dispensing member 410, and the other driving member 430 is used to drive the in-bin dispensing member 420.

[0043] In this embodiment, the silo 210 includes a vertical plate 212 and an inclined plate 214 that is inclined relative to the vertical plate 212. In the vertical direction, the minimum distance between the inclined plate 214 and the vertical plate 212 is the discharge port 210a. That is, in this embodiment, the silo 210 is a half-vertex silo, which can not only save the space of the feeding mechanism 200 to optimize the overall structure of the powder feeding device 10, but also the material can be introduced into the roller gap 300c of the rolling mechanism 300 through the discharge port 210a in a non-free fall motion. The non-free fall motion can improve the concentration of the material when entering the roller gap 300c and reduce the undesirable unevenness caused by the divergence of the material. It can be understood that in other embodiments, the silo 210 can also be square, and the four side panels of the side wall of the silo 210 are all vertical panels.

[0044] In this embodiment, the vertical plate 212 and the inclined plate 214 are arranged at a 45° angle. In this way, the capacity of the silo 210 and the good non-free fall motion of the material can be taken into account. It can be understood that in other embodiments, the vertical plate 212 and the inclined plate 214 can also be arranged at any acute angle.

[0045] In this embodiment, both the vertical plate 212 and the inclined plate 214 are provided with a heating mechanism 600. In this way, the material can be heated more fully and efficiently, thereby solving the problem of insufficient material heating time and greatly improving the film forming quality. It is understood that in other embodiments, the heating mechanism 600 can also be provided only at the vertical plate 212 or the inclined plate 214.

[0046] In this embodiment, the powder feeding device 10 further includes a heat insulation mechanism 700. The heat insulation mechanism 700 is disposed on a side of the heating mechanism 600 away from the inner wall of the silo 210. Specifically, in this embodiment, the heat insulation mechanism 700 is divided into two pieces, which are disposed on the outside of the heating mechanism 600 at the vertical plate 212 and the inclined plate 214, respectively. The heat insulation mechanism 700 can keep the heated material warm and reduce heat dissipation, and can also provide heat insulation protection for the electric components around the heating mechanism 600. It can be understood that in other embodiments, the heat insulation mechanism 700 can also be omitted.

[0047] In this embodiment, the feeding mechanism 200 further includes a feeding assembly 220. The feeding assembly 220 includes a feeding bin 222 disposed at the discharge port 210a and a feeding roller 224 rotatably disposed in the feeding bin 222. The feeding roller 224 has a plurality of feeding troughs 224a arranged at intervals along the circumferential direction. Each feeding trough 224a can move between a first position and a second position. When the feeding trough 224a is in the first position, the feeding trough 224a is communicated with the discharge port 210a, and the material in the bin 210 is introduced into the feeding trough 224a. When the feeding trough 224a is in the second position, the material in the feeding trough 224a is introduced into the roller gap 300c. In this way, continuous feeding can be achieved by rotating the feeding roller 224, and the feeding amount of the feeding mechanism 200 to the roller gap 300c of the roller pressing mechanism 300 can be controlled to be the amount of material in the feeding trough 224a each time, so as to achieve automatic and continuous control of the feeding amount and solve the problem of unstable material feeding. It can be understood that in other embodiments, when the feeding assembly 220 is omitted, the material can be directly introduced into the roller gap 300c of the roller pressing mechanism 300 through the discharge port 210a.

[0048] It should be noted that the multiple feeding troughs 224a of the feeding roller 224 are all identical, and the trough width and depth of the feeding trough 224a match the particle size of the material, and the feeding trough 224a and the feeding bin 222 can form a closed cavity in the circumferential direction to ensure smooth feeding and discharging of materials. Specifically, in this embodiment, the feeding roller 224 has 6-10 identical feeding troughs 224a.

[0049] In this embodiment, the feeding assembly 220 further includes a feeding nozzle 226 disposed on the feeding bin 222. When the feeding trough 224a is in the second position, the feeding trough 224a is connected to the feeding nozzle 226, and the material in the feeding trough 224a is introduced into the roller gap 300c through the feeding nozzle 226. In this way, it is more convenient to introduce the material into the roller gap 300c. It can be understood that in other embodiments, when the feeding nozzle 226 is omitted, the material can be directly introduced into the roller gap 300c through the feeding trough 224a.

[0050] In this embodiment, the inclination and inclination direction of the feed nozzle 226 are the same as the inclination and inclination direction of the inclined plate 214. In this way, it is not only convenient for the material to be introduced from the discharge port 210a to the feed nozzle 226 through the feed roller shaft 224, but also the material can be introduced into the roller gap 300c of the roller pressing mechanism 300 through the feed nozzle 226 in a non-free fall motion. The non-free fall motion can improve the concentration of the material when entering the roller gap 300c and reduce the undesirable unevenness caused by the divergence of the material. It can be understood that in other embodiments, the inclination and inclination direction of the feed nozzle 226 can also be different from the inclination and inclination direction of the inclined plate 214.

[0051] In this embodiment, the powder feeding device 10 further includes a first sensor 800a disposed on the silo 210. The first sensor 800a is used to detect the material level of the material in the silo 210. The material level of the material in the silo 210 is detected by the first sensor 800a and fed back to the outside, which is more convenient for automatic feeding. It can be understood that in other embodiments, the first sensor 800a can be omitted, and the material level of the material in the silo 210 can be manually monitored.

[0052] In this embodiment, the powder feeding device 10 further includes a second sensor 800b disposed on the silo 210. The second sensor 800b is used to detect the material level height of the material at the roller gap 300c. The material level height of the material at the roller gap 300c is detected by the second sensor 800b and fed back to the feeding assembly 220, so that the rotation speed of the feeding roller shaft 224 can be controlled to change the feeding rate, so that the automatic operation of the powder feeding device 10 is stable and reliable. Specifically, when the material level height at the roller gap 300c is greater than the preset height range, the rotation speed of the feeding roller shaft 224 is reduced so that the material level height at the roller gap 300c is restored to the preset height range. In addition, the material level height at the roller gap 300c is detected by the second sensor 800b, so that the material level height can also be freely set within a certain range to adapt to different material characteristics.

[0053] The film-forming width cannot be automatically adjusted, which affects the efficiency of product changeover (even if it can be changed, there will be a serious problem of material waste), and some even cannot be changed, which seriously restricts the further development of dry coating technology. To solve the above problems, in this embodiment, the powder feeding device 10 also includes an automatic width adjustment mechanism 900. The automatic width adjustment mechanism 900 is used to adjust the length of the material at the roller gap 300c along the length direction of the first roller 300a and the second roller 300b, that is, to adjust the film-forming width. In this way, it is very convenient for product changeover and reduces material waste. Moreover, the wider the rolling width of the material, the greater the roller pressure required. Under the condition that the entire rolling condition remains unchanged, the roller pressure on the material is significantly changed by adjusting different feeding widths, which is very helpful for studying the influence of the roller pressure on the film quality, and can provide data support for the optimization of the rolling conditions in the later stage.

[0054] In this embodiment, the automatic width adjustment mechanism 900 includes two width adjustment baffles 910 arranged at intervals. The width adjustment baffles 910 are arranged on the material bin 210 and can reciprocate along the length direction of the first roller 300a and the second roller 300b. The length of the material at the roller gap 300c is the distance between the two width adjustment baffles 910. In this way, when the two width adjustment baffles 910 move towards each other at the same time, the film forming width is reduced, and vice versa, the film forming width is increased, which is very convenient for adjusting the film forming width.

[0055] It should be noted that, in this embodiment, the movement stroke of the roller gap material stripping member 410 and the in-bin material stripping member 420 along the length direction of the first roller 300a and the second roller 300b is adjustable. When the film forming width is adjusted, the movement stroke of the roller gap material stripping member 410 and the in-bin material stripping member 420 along the length direction of the first roller 300a and the second roller 300b is adjusted accordingly.

[0056] In this embodiment, the electric components and sensors of the powder feeding device 10 are arranged at a position away from the heating mechanism 600. An insulation mechanism 700 is used between the electric components and sensors of the powder feeding device 10 and the heating mechanism 600 to reduce the heat conduction efficiency and minimize the impact of the heating mechanism 600 on the electric components and sensors.

[0057] In this embodiment, if the movement of the roller gap material stripping member 410, the in-bin material stripping member 420 and the width adjustment baffle 910 adopts linear guide components, the linear guide components adopted are all self-lubricating plastic components. Self-lubricating plastic components do not require lubrication, which can reduce the pollution to the film-forming product and reduce the negative impact of raw material dust on mechanical components.

[0058] In this embodiment, an angle transmission structure is used to maximize the reduction of the dimension in the rolling width direction (the direction in which the first roller 300a and the second roller 300b are arranged side by side), so that the width of the entire rolling mechanism 300 can be reduced by a corresponding dimension, thereby improving the strength and rigidity of the rolling mechanism 300.

[0059] The utility model also provides a dry coating device. The dry coating device includes the above-mentioned powder feeding device 10. Specifically, in this embodiment, the dry coating device is a lithium battery composite film making device. More specifically, in this embodiment, the powdered material can be graphite, pure lithium, lithium alloy, lithium battery electrode active material, etc.

[0060] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A powder feeding device, characterized in that: include: A feeding mechanism, comprising a silo, wherein the silo has a discharge port; The rolling mechanism comprises a first roller and a second roller arranged in parallel, wherein a roller gap corresponding to the discharge port is formed between the first roller and the second roller; as well as The material shifting mechanism comprises a roller gap material shifting member, and the roller gap material shifting member can perform linear reciprocating stirring on the material at the roller gap along the length direction of the first roller and the second roller.

2. The powder feeding device according to claim 1, characterized in that The roll gap material shifting member can also move toward or away from the roll gap to adjust the depth of the roll gap material shifting member inserted into the material located at the roll gap.

3. The powder feeding device according to claim 2, characterized in that: It also includes a lifting mechanism arranged on the material bin, and the roller gap material shifting member is arranged on the lifting mechanism.

4. The powder feeding device according to claim 1, characterized in that It also includes a heating mechanism with adjustable heating temperature, and the heating mechanism is arranged on the side wall of the silo.

5. The powder feeding device according to claim 4, characterized in that It also includes a heat insulation mechanism, which is arranged on a side of the heating mechanism away from the inner wall of the silo; and / or The silo includes a vertical plate and an inclined plate inclined relative to the vertical plate. In the vertical direction, the discharge port is located at a point where the distance between the inclined plate and the vertical plate is the smallest. Both the vertical plate and the inclined plate are provided with the heating mechanism.

6. The powder feeding device according to claim 1, characterized in that: The material shifting mechanism also includes an in-bin material shifting member, and the in-bin material shifting member can stir the material in the silo.

7. The powder feeding device according to claim 6, characterized in that The material shifting member in the bin can stir the material in the bin in a linear reciprocating manner along the length direction of the first roller and the second roller.

8. The powder feeding device according to claim 7, characterized in that The material-discharging mechanism further comprises a driving member, which can simultaneously drive the roller gap material-discharging member and the in-bin material-discharging member to perform linear reciprocating stirring along the length direction of the first roller and the second roller.

9. The powder feeding device according to claim 1, characterized in that: The feeding mechanism also includes a feeding assembly, which includes a feeding bin arranged at the discharge port and a feeding roller rotatably arranged in the feeding bin, the feeding roller having a plurality of feeding troughs arranged at intervals along the circumferential direction, each of the feeding troughs being able to move between a first position and a second position, when the feeding trough is in the first position, the feeding trough is connected to the discharge port, and the material in the bin is introduced into the feeding trough, and when the feeding trough is in the second position, the material in the feeding trough is introduced into the roller gap.

10. The powder feeding device according to claim 9, characterized in that The silo comprises a vertical plate and an inclined plate arranged obliquely relative to the vertical plate, and in the vertical direction, the point where the distance between the inclined plate and the vertical plate is the smallest is the discharge port; The feeding assembly also includes a feeding nozzle arranged on the feeding bin, the inclination and inclination direction of the feeding nozzle are the same as the inclination and inclination direction of the inclined plate, and when the feeding trough is in the second position, the feeding trough is connected to the feeding nozzle, and the material in the feeding trough is introduced into the roller gap through the feeding nozzle.

11. The powder feeding device according to claim 1, characterized in that: The system further comprises a first sensor disposed on the silo, wherein the first sensor is used to detect a material level height of the material in the silo; and / or It also includes a second sensor disposed on the silo, and the second sensor is used to detect the material level height of the material at the roller gap.

12. The powder feeding device according to claim 1, characterized in that It also includes an automatic width adjustment mechanism, which is used to adjust the length of the material at the roller gap along the length direction of the first roller and the second roller.

13. The powder feeding device according to claim 12, characterized in that The automatic width adjustment mechanism includes two width adjustment baffles arranged at intervals, and the width adjustment baffles can reciprocate along the length direction of the first roller and the second roller. The length of the material at the roller gap is the distance between the two width adjustment baffles.

14. A dry coating device, characterized in that: Comprising a powder feeding device as described in any one of claims 1-13.

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