Roller device based on powder smoothing and dry coating machine

Abstract

The utility model discloses a roller device based on powder smoothing and a dry coating machine, and relates to the technical field of dry coating. The roller device based on powder smoothing comprises a roller assembly, a roller pressing assembly, a roller pressing assembly and a roller pressing assembly, the powder supply assembly comprises a box body and a powder smoothing mechanism, the box body is provided with a discharging channel, an outlet of the discharging channel is opposite to and communicates with an inlet of the rolling channel, the powder smoothing mechanism comprises a push plate and a first driving part, the push plate is arranged in the discharging channel, and the first driving part is arranged in the discharging channel; the first driving part is configured to drive the push plate to move in a reciprocating mode in the direction perpendicular to the extending direction of the discharging channel so as to conduct smoothing treatment on powder before the powder enters the rolling channel. According to the powder feeding device, powder can be evenly fed to the rolling channel, the problems that the density of rolled film materials is not uniform, even holes are formed and the like are solved, and therefore the manufacturing quality of the film materials is improved.

Description

Technical Field

[0001] This utility model relates to the field of dry coating technology, and in particular to a roller device and dry coating machine based on powder smoothing. Background Technology

[0002] Dry coating is a crucial process in battery electrode manufacturing. It involves uniformly coating dry powder materials (including active materials, conductive agents, and binders) onto foil materials such as copper or aluminum foil using a dry coating machine. During the coating process, calendering or rolling is used to ensure a tight bond between the dry powder materials and the foil, thus creating the positive or negative electrode sheet for the battery. Compared to wet coating technology, dry coating technology offers advantages such as solvent-free operation, process simplicity, low energy consumption, and environmental friendliness.

[0003] With the rapid development of the new energy lithium-ion battery industry, dry coating technology is also advancing by leaps and bounds. For example, the performance and structure of the rolling mill device used to roll battery electrodes are also being updated and improved. The rolling mill device usually includes two pressure rollers that can rotate relative to each other, with a gap formed between the two pressure rollers for the film material to pass through or for rolling powder into film material.

[0004] However, before the powder enters the gap between the two pressure rollers, it is difficult to keep the powder in a uniform feeding state at different positions at the gap opening, which leads to uneven density of the film formed by roller pressing, and even problems such as holes. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a powder leveling roller device and a dry coating machine, which can achieve uniform feeding of powder to the roller pressing channel, avoiding problems such as uneven density or even voids in the film material after roller pressing.

[0006] The first aspect of this utility model provides a roller device based on powder smoothing, comprising:

[0007] A roll assembly having a roll pressing channel;

[0008] A powder supply assembly includes a housing and a powder leveling mechanism. The housing has a feeding channel, the outlet of which is opposite to and connected to the inlet of a roller pressing channel. The powder leveling mechanism includes a pusher plate and a first driving member. The pusher plate is disposed within the feeding channel, and the first driving member is configured to drive the pusher plate to reciprocate in a direction perpendicular to the extension direction of the feeding channel to level the powder before it enters the roller pressing channel.

[0009] The powder smoothing roller device according to the first aspect of the present invention has at least the following beneficial effects: during the process of powder flowing from the feeding channel of the box to the roller pressing channel of the roller assembly, the powder smoothing mechanism operates, causing the first driving member to drive the push plate to continuously reciprocate within the feeding channel, so as to smooth the powder located in the feeding channel, thereby ensuring that the powder at each position in the feeding channel is smoothed more evenly. Therefore, it can ensure that the powder at each position of the outlet of the feeding channel and at each position of the inlet of the roller pressing channel is flat and even, so as to achieve uniform feeding of powder to the roller pressing channel, thereby improving the quality of the film formed by roller pressing and preventing uneven density or even the formation of holes in the film.

[0010] In some embodiments of this utility model, the length of the push plate extends along the thickness direction of the feeding channel, and the moving direction of the push plate is the width direction of the feeding channel; and / or, the first driving member is an electric push rod, the movable rod of the electric push rod passes through the housing and is fixedly connected to the push plate.

[0011] In some embodiments of this utility model, the opposite side walls of the feeding channel are provided with receiving grooves for the pusher plate to enter and exit. The receiving grooves have inclined guide walls so that the powder in the receiving grooves slides into the feeding channel.

[0012] In some embodiments of this utility model, the powder smoothing mechanism is provided with two push plates, which are arranged opposite to each other and spaced apart along the moving direction of the push plates, and the two first driving members are configured to drive the corresponding push plates to move synchronously in the same direction.

[0013] In some embodiments of this utility model, the housing is provided with a first detection position and a second detection position, which are respectively located on opposite sides of the push plate along the extending direction of the feeding channel. The powder supply component further includes a first level sensor and a second level sensor, which are configured to collect level data at the first detection position and the second detection position, respectively. The powder supply component is configured to control the feeding speed of the feeding channel based on the level data from the first level sensor and the second level sensor, so that the powder in the feeding channel is located in the area between the first detection position and the second detection position.

[0014] In some embodiments of this utility model, the powder supply assembly further includes a vibrating screen assembly and a feeding roller assembly. The feeding roller assembly is configured to convey powder into the feeding channel, the vibrating screen assembly is configured to convey powder into the feeding roller assembly, and the pusher plate is located between the feeding roller assembly and the outlet of the feeding channel.

[0015] In some embodiments of this utility model, the feeding roller includes a feeding rod and a second driving member. The length of the feeding rod extends along the width direction of the feeding channel. The feeding rod is disposed in the feeding channel. The outer circumferential surface of the feeding rod is provided with a plurality of feeding grooves extending along the length direction of the feeding rod. The plurality of feeding grooves are arranged in a circumferential array along the circumference of the feeding rod. The second driving member is configured to drive the feeding rod to rotate circumferentially to feed material in the direction of the outlet of the feeding channel.

[0016] In some embodiments of this utility model, the vibrating screen assembly includes a guide trough, a screen, and a vibrator. The guide trough has a guide channel, the outlet of which is opposite to and connected to the inlet of the discharge channel. The screen is disposed in the guide channel. At least one vibrator is provided and connected to the guide trough. The vibrator is configured to drive the guide trough to vibrate.

[0017] In some embodiments of this utility model, the housing is provided with a third detection position and a fourth detection position. The third detection position and the fourth detection position are arranged at intervals along the extension direction of the feeding channel and are located on the same side of the feeding rod away from the push plate along the extension direction of the feeding channel. The powder supply assembly further includes a third level sensor and a fourth level sensor. The third level sensor and the fourth level sensor are configured to collect the level data of the third detection position and the fourth detection position, respectively. The powder supply assembly is configured to control the frequency and / or amplitude of the vibrating screen assembly according to the level data of the third level sensor and the fourth level sensor, so that the powder between the vibrating screen assembly and the feeding rod is located in the area between the third detection position and the fourth detection position.

[0018] A second aspect of this invention provides a dry coating machine, including a powder smoothing-based roller device as described in the first aspect embodiment.

[0019] The dry coating machine according to the second aspect of the present invention has at least the following beneficial effects: the dry coating machine adopts the roller device with the above-mentioned structure, which can realize uniform feeding of the roller assembly to form a film material with uniform density by roller pressing, thereby producing battery electrode sheets of better quality, which is beneficial to improving battery quality.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a roller device based on powder smoothing provided according to an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional schematic diagram of a roller device based on powder smoothing provided according to an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional schematic diagram of the feeding roller according to an embodiment of the present utility model.

[0024] Reference numerals: 100, Roller assembly; 210, Housing; 211, Feeding channel; 212, Feeding inlet; 220, Powder smoothing mechanism; 221, First driving component; 222, Push plate; 223, First material level sensor; 224, Second material level sensor; 225, Receiving groove; 230, Feeding roller assembly; 231, Second driving component; 232, Feeding rod; 233, Third material level sensor; 234, Fourth material level sensor; 235, Protrusion; 236, Feeding groove; 237, Housing; 238, Feed inlet; 239, Discharge outlet; 240, Vibrating screen assembly; 241, Guide trough; 242, Guide inlet; 243, Guide channel; 244, Screen; 245, Vibrator; 250, Support base. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The following is for reference. Figures 1 to 3This invention describes a powder smoothing-based roller device and a dry coating machine according to embodiments of the present invention.

[0029] like Figures 1 to 3 As shown, the powder-smoothing roller device according to the first aspect of the present invention can be applied to a dry coating machine. It can not only apply a certain roller pressure to the film material or roll the dry powder material (hereinafter referred to as powder) into a film material with a certain thickness, but also make the powder material uniformly fed to the roller pressure channel, ensuring that the density of the film material formed by roller pressure is uniform, and effectively avoiding problems such as uneven density or even holes in the film material after roller pressure.

[0030] The powder leveling roller device has a first direction, a second direction, and a third direction, wherein the first direction, the second direction, and the third direction are arranged perpendicularly to each other. In this embodiment, it is assumed that the first direction is the front-back direction, the second direction is the left-right direction, and the third direction is the up-down direction.

[0031] like Figures 1 to 3 As shown, the powder leveling roller device includes a roller assembly 100 and a powder supply assembly.

[0032] The roll assembly 100 has a roll pressing channel that extends through the roll pressing channel in a third direction, meaning the extension direction of the roll pressing channel is along a third direction. Therefore, a roll pressing inlet and a roll pressing outlet are formed at opposite ends of the roll pressing channel along its extension direction. Powder enters the roll pressing channel from the roll pressing inlet and exits from the roll pressing outlet. The powder passing through the roll pressing channel is rolled into a film. In this embodiment, the roll pressing inlet is located on the upper side of the roll pressing channel, and the roll pressing outlet is located on the lower side of the roll pressing channel.

[0033] Understandably, the roll assembly 100 includes pressure rolls and a rotary drive. The length of the pressure rolls extends along a first direction, and two pressure rolls are arranged at a certain interval along a second direction to form a roll pressing channel for passing film material or pressing powder into film material. The two pressure rolls are configured to rotate relative to each other, that is, their rotation directions are opposite. The rotary drive is configured to drive the pressure rolls to rotate circumferentially. The rotary drive includes a motor and a transmission structure, which can be a coupling, a gear transmission structure, a chain transmission structure, or a reducer, etc. The rotary drive can drive one or both pressure rolls to rotate.

[0034] The powder supply assembly is disposed on one side of the roll assembly 100 along the third direction. In this embodiment, the powder supply assembly is located above the roll assembly 100. The structure of the powder supply assembly includes a housing 210 and a powder leveling mechanism 220.

[0035] The housing 210 includes a feeding channel 211, which extends in the same direction as the roller pressing channel, meaning it also extends through the third direction. An inlet and an outlet are formed at opposite ends of the feeding channel 211. The feeding direction of the feeding channel 211 is its feeding direction. The outlet of the feeding channel 211 is opposite to the inlet of the roller pressing channel, and they are connected to each other, allowing the powder in the feeding channel 211 to fall onto the pressure roller of the roller assembly 100. In this embodiment, the outlet of the feeding channel 211 is a feeding port, which is in contact with the outer circumferential surface of the pressure roller of the roller assembly 100, allowing the powder to fall from the outlet of the feeding channel 211 onto the roller assembly 100. The feeding channel 211 extends in a third direction, its thickness direction is a second direction, and its width direction is a first direction.

[0036] In this embodiment, the housing 210 is located above the roll assembly 100, and the feeding channel 211 and the rolling channel are arranged vertically opposite each other and are interconnected. The feeding channel 211 is rectangular when viewed vertically, and the cross-sectional shape of the housing 210 is also rectangular when viewed vertically. The bottom of the housing 210 and the outlet of the feeding channel 211 are funnel-shaped, and the bottom of the housing 210 can extend into the inlet of the rolling channel so that the powder in the feeding channel 211 falls into the rolling channel.

[0037] The powder leveling mechanism 220 includes a pusher plate 222 and a first drive member 221. The pusher plate 222 is disposed within the feeding channel 211 and can move linearly within the feeding channel 211 to level the powder within it. The first drive member 221 is disposed outside the feeding channel 211, and its output end passes through the housing 210, allowing it to connect with the pusher plate 222. Furthermore, the first drive member 221 is configured to drive the pusher plate 222 to reciprocate along a direction perpendicular to the extension direction of the feeding channel 211 to level the powder before it enters the roller pressing channel. It is understood that in some examples, the pusher plate 222 can reciprocate linearly along the width direction of the feeding channel 211. In other examples, the pusher plate 222 can reciprocate linearly along the thickness direction of the feeding channel 211.

[0038] In this embodiment, the pusher plate 222 moves in the width direction of the feeding channel 211. The pusher plate 222 can be a square plate, with its length extending along the thickness direction of the feeding channel 211, its width extending along the extension direction of the feeding channel 211, and its thickness extending along the width direction of the feeding channel 211. The opposite sides of the pusher plate 222 along its length can respectively slide in contact with the opposite side walls of the feeding channel 211 along its thickness direction. Of course, in other embodiments, it is not excluded that there is a certain gap between the opposite sides of the pusher plate 222 along its length direction and the opposite side walls of the feeding channel 211 along its thickness direction, and this gap can be smaller than the particle size of the powder.

[0039] The first driving component 221 is an electric push rod. The movable rod of the electric push rod can extend and retract along a first direction, thereby driving the push plate 222 to move back and forth along the first direction to smooth the powder in the feeding channel 211, ensuring that the powder in all positions in the feeding channel 211 is flat and uniform. The electric push rod is bolted to the housing 210, and the movable rod of the electric push rod passes through the housing 210 and is fixedly connected to the push plate 222. The connection between the movable rod of the electric push rod and the housing 210 is sealed with a sealant. Of course, in other embodiments, it is not excluded that the first driving component 221 can be a cylinder or other type of linear drive device.

[0040] In one specific embodiment, the number of powder smoothing mechanisms 220 is one.

[0041] In another specific embodiment, two powder leveling mechanisms 220 are provided. Two push plates 222 are arranged opposite each other along the moving direction of the push plates 222 and are set at a certain interval. Moreover, the output ends of two first driving members 221 are fixedly connected to the corresponding push plates 222, and the two first driving members 221 are configured to drive the corresponding push plates 222 to move synchronously in the same direction.

[0042] Understandably, when one of the first driving components 221 drives the corresponding push plate 222 to move to one side of the direction of movement of the push plate 222, the other first driving component 221 will simultaneously drive the corresponding push plate 222 to move to one side of the direction of movement of the push plate 222. That is to say, the two push plates 222 move in a straight line in the same direction at the same time. This can avoid interference problems in the powder smoothing process, so that the powder in the feeding channel 211 can be smoothed more evenly and effectively prevent the accumulation of too much powder in the middle of the feeding channel 211, which would affect the powder smoothing effect.

[0043] When using the powder smoothing roller device provided in the first aspect embodiment of this utility model, during the process of powder flowing from the feeding channel 211 of the box 210 to the roller pressing channel of the roller assembly 100, the powder smoothing mechanism 220 is activated, so that the first driving member 221 can drive the push plate 222 to continuously reciprocate within the feeding channel 211, so as to apply a certain smoothing effect to the powder located in the feeding channel 211, ensuring that the powder at each position in the feeding channel 211 is smoothed more evenly, so that the powder at each position at the outlet of the feeding channel 211 and the powder at each position at the inlet of the roller pressing channel are in a flat and uniform state, thereby achieving uniform delivery of powder to the roller pressing channel, improving the quality of the film formed by roller pressing, and preventing the film from having uneven density or even producing holes.

[0044] In some embodiments, such as Figure 2 As shown, the opposite side walls of the feeding channel 211 are provided with receiving grooves 225, which are connected to the feeding channel 211. The receiving grooves 225 can be used for the pusher plate 222 to enter and exit. Moreover, the receiving grooves 225 have inclined guide walls to allow the powder in the receiving grooves 225 to slide into the feeding channel 211. The side wall of the receiving grooves 225 near the roll assembly 100 along the extension direction of the feeding channel 211 is the guide wall. The guide wall can be a flat inclined surface, or an arc-shaped convex surface or an arc-shaped concave surface. The function of the guide wall is to guide the powder in the receiving grooves 225 to the feeding channel 211, avoiding excessive powder accumulation in the receiving grooves 225 and resulting in powder waste.

[0045] In this embodiment, since the pusher plate 222 moves along the width direction of the feeding channel 211, the two opposite sidewalls of the feeding channel 211 are recessed along its width direction to form receiving grooves 225. The receiving grooves 225 are right-angled trapezoids, and the lower sidewall of the receiving grooves 225 is a guide wall, which slopes downwards to the outlet of the feeding channel 211. The two receiving grooves 225 are symmetrically arranged along the width direction of the feeding channel 211.

[0046] Understandably, by providing a receiving groove 225 within the feeding channel 211, the pusher plate 222 moves linearly into the receiving groove 225 under the driving action of the first driving member 221. This allows the powder in the area of ​​the feeding channel 211 excluding the receiving groove 225 to be smoothed out evenly. At this time, some powder will enter the receiving groove 225 along with the pusher plate 222. When the pusher plate 222 withdraws from the receiving groove 225, the powder pushed into the receiving groove 225 by the pusher plate 222 can slide down into the feeding channel 211 under its own gravity and the guiding action of the guide wall, allowing this part of the powder to be smoothed out and sent to the roller pressing channel, thereby improving the utilization rate of the powder. Moreover, it can prevent excessive powder from accumulating on the opposite sides of the feeding channel 211 along its width direction, which would reduce the powder smoothing effect.

[0047] like Figure 2 As shown, in some embodiments, the powder supply assembly further includes a first level sensor 223 and a second level sensor 224.

[0048] The housing 210 is provided with a first detection position and a second detection position, which are located on opposite sides of the push plate 222 along the extending direction of the feeding channel 211. In this embodiment, the first detection position is located on the upper side of the push plate 222, and the second detection position is located on the lower side of the push plate 222. Moreover, the first and second detection positions are located at the receiving groove 225.

[0049] The first level sensor 223 and the second level sensor 224 are respectively located on opposite sides of the pusher plate 222 along the extending direction of the feeding channel 211. The first level sensor 223 is correspondingly set at the first detection position to detect the material level at the first detection position in the feeding channel 211; the second level sensor 224 is correspondingly set at the second detection position to detect the material level at the second detection position in the feeding channel 211. In this embodiment, the first level sensor 223 and the second level sensor 224 are through-beam infrared sensors. When the detection beam emitted by the first level sensor 223 or the second level sensor 224 is blocked by the powder in the feeding channel 211, the first level sensor 223 or the second level sensor 224 will generate a detection signal, thereby obtaining the material level data and transmitting it to the powder supply component.

[0050] The first level sensor 223 and the second level sensor 224 are configured to collect level data at the first detection position and the second detection position, respectively. Furthermore, the powder supply assembly is configured to control the feeding speed of the feeding channel 211 based on the level data from the first level sensor 223 and the second level sensor 224, so that the powder in the feeding channel 211 is located in the area between the first and second detection positions, allowing the pusher plate 222 to smooth the powder in that area.

[0051] Understandably, when the first level sensor 223 does not generate level data, the powder supply component increases the feeding speed of the feeding channel 211 to allow more powder to enter the channel 211, enabling the first level sensor 223 to generate level data. When the first level sensor 223 generates level data but the second level sensor 224 does not, the powder supply component decreases the feeding speed of the feeding channel 211. When the second level sensor 224 generates level data, the powder supply component significantly reduces the feeding speed of the feeding channel 211, even reducing it to zero.

[0052] By setting a first material level sensor 223 and a second material level sensor 224, the material level near the push plate 222 in the feeding channel 211 is detected, so as to ensure that the powder is located in the area between the first detection position and the second detection position, and the feeding speed of the feeding channel 211 is controlled in a closed loop.

[0053] like Figures 1 to 3 As shown, in some embodiments, the powder supply assembly further includes a vibrating screen assembly 240 and a feeding roller assembly 230.

[0054] The feeding roller 230 is mounted on the housing 210 and is configured to convey powder into the feeding channel 211. A pusher plate 222 is located between the feeding roller 230 and the outlet of the feeding channel 211. While the feeding roller 230 delivers powder into the feeding channel 211, the pusher plate 222 smooths the powder within the feeding channel 211. A vibrating screen assembly 240 is located on the side of the feeding roller 230 extending along the feeding channel 211 away from the pusher plate 222, and is configured to convey powder into the feeding roller 230.

[0055] Understandably, by setting up the vibrating screen assembly 240, the powder to be flowed into the feeding channel 211 can be crushed, preventing large particles from entering the feeding channel 211. Specifically, the powder first undergoes crushing and screening by the vibrating screen assembly 240, and then flows towards the feeding roller 230; then, under the conveying action of the feeding roller 230, the powder flows downward along the feeding channel 211. A large amount of powder fills the feeding channel 211, and some powder will flow out from the outlet of the feeding channel 211, while the powder leveling mechanism 220 can level the top of the powder in the feeding channel 211.

[0056] In this embodiment, the feeding roller 230 includes a feeding rod 232 and a second driving member 231. The feeding rod 232 extends along the width direction of the feeding channel 211 and is rotatably disposed within the feeding channel 211. The feeding rod 232 can rotate relative to the housing 210 around its own central axis. The outer circumferential surface of the feeding rod 232 is provided with multiple feeding grooves 236, each extending along the length direction of the feeding rod 232. The multiple feeding grooves 236 are arranged in a circumferential array along the circumference of the feeding rod 232. The second driving member 231 is installed outside the feeding channel 211. The output end of the second driving member 231 penetrates the housing 210 and is fixedly connected to one end of the feeding rod 232. The second driving member 231 is configured to drive the feeding rod 232 to rotate circumferentially, feeding material towards the outlet direction of the feeding channel 211. The second driving component 231 can be, but is not limited to, a motor and a transmission mechanism, and the transmission mechanism can be a coupling or a reducer, etc.

[0057] In a specific embodiment, such as Figure 2 and Figure 3 As shown, the feeding rod 232 is located between the push plate 222 and the inlet of the feeding channel 211. The housing 210 includes a first material box and a second material box, which are arranged at intervals along the extension direction of the feeding channel 211. The feeding roller 230 is disposed between the first material box and the second material box. The powder smoothing mechanism 220 is disposed on the second material box. The outlet of the feeding channel 211 is located on the second material box, and the inlet of the feeding channel 211 is located on the first material box. The inlet of the feeding channel 211 is a funnel-shaped feeding inlet 212.

[0058] Furthermore, the feeding roller 230 also includes a housing 237, which is detachably connected to the first and second material boxes via bolts. The length of the housing 237 extends along the length direction of the feeding rod 232, and the interior of the housing 237 is hollow, forming a cavity with a circular cross-sectional shape when viewed along the length direction of the housing 237. The housing 237 has an inlet 238 and an outlet 239 on opposite sides along the extension direction of the feeding channel 211, respectively. The inlet 238 and outlet 239 are rectangular when viewed along the extension direction of the feeding channel 211 and are connected to the cavity. The inlet 238 is connected to the interior of the first material box, and the outlet 239 is connected to the interior of the second material box.

[0059] The feeding rod 232 is disposed within the cavity, and its opposite ends are mounted on the housing 237 via bearings. The second driving member 231 is mounted on the housing 237 and fixedly connected to the feeding rod 232, allowing the feeding rod 232 to rotate circumferentially relative to the housing 237. Multiple protrusions 235 protrude outward from the outer circumference of the feeding rod 232, and these protrusions 235 are evenly arranged in a circle along the outer circumference of the feeding rod 232. Any two adjacent protrusions 235 together define a feeding groove 236, the cross-sectional shape of which can be square, isosceles trapezoidal, or V-shaped. The gap between the protrusions 235 and the inner circumferential surface of the cavity is very small, smaller than the particle size of the powder. Of course, in other embodiments, sliding contact between the protrusions 235 and the inner circumferential surface of the cavity is not excluded.

[0060] It is understandable that when the feeding rod 232 rotates one revolution under the driving action of the second driving component 231, the total volume of all the feeding grooves 236 on the feeding rod 232 is the feeding volume (or feeding volume). Therefore, during feeding, by controlling and measuring the rotational speed of the feeding rod 232, the feeding amount can be obtained and controlled, thereby controlling the feeding speed of the feeding channel 211. The rotational speed data of the feeding rod 232 can be obtained through a rotational speed sensor.

[0061] Of course, it is possible that in other embodiments, the feeding roller 230 may use a screw conveyor structure for feeding. Furthermore, the housing 237 may also be integrally formed with the box 210.

[0062] In this embodiment, the vibrating screen assembly 240 includes a guide trough 241, a screen 244, and a vibrator 245. The guide trough 241 has a guide channel 243, which extends in the same direction as the discharge channel 211, meaning the guide channel 243 extends and connects in a third direction, so that its opposite ends form an inlet and an outlet, respectively. The inlet of the guide channel 243 is a funnel-shaped guide inlet 242, and the outlet of the guide channel 243 is opposite to and connected to the inlet of the discharge channel 211. The outlet of the guide channel 243 is less than or equal to the inlet of the discharge channel 211.

[0063] The material guide trough 241 is located above the box 210, and the outlet of the guide channel and the inlet of the discharge channel 211 are arranged vertically opposite each other.

[0064] A screen 244 is disposed within the feed channel 243 and connected to the feed trough 241. The screen 244 is used to screen the powder within the feed channel 243, ensuring that powder of suitable particle size flows out of the outlet of the feed channel 243 and preventing excessively large particles from entering the discharge channel 211. The screen 244 can be detachably connected, allowing for the selection and replacement of screens 244 with different mesh sizes according to process requirements.

[0065] At least one vibrator 245 is provided, and all vibrators 245 are connected to the feed trough 241. The vibrators 245 are configured to drive the feed trough 241 to vibrate. The powder supply assembly also includes a support base 250 on which the vibrators 245 can be mounted. Four vibrators 245 are provided, respectively located on opposite sides of the feed trough 241 along a first direction and on opposite sides along a second direction. It is understood that by driving the feed trough 241 and the screen 244 to vibrate together by the vibrators 245, the powder can be crushed, allowing large-particle-size powder to be crushed and pass through the screen 244, reducing the waste of unqualified powder.

[0066] like Figure 2 As shown, the powder supply assembly further includes a third level sensor 233 and a fourth level sensor 234.

[0067] The housing 210 is provided with a third detection position and a fourth detection position, which are arranged at intervals along the extension direction of the feeding channel 211. Both positions are located on the same side of the feeding rod 232 away from the push plate 222 along the extension direction of the feeding channel 211; that is, both the third and fourth detection positions are located between the feeding rod 232 and the inlet of the feeding channel 211. In this embodiment, both the third and fourth detection positions are located above the feeding rod 232.

[0068] The third level sensor 233 and the fourth level sensor 234 are arranged at certain intervals along the third direction of the housing 210. The third level sensor 233 is set at the third detection position to detect the material level at the third detection position in the feeding channel 211; the fourth level sensor 234 is set at the fourth detection position to detect the material level at the fourth detection position in the feeding channel 211.

[0069] In this embodiment, the third level sensor 233 and the fourth level sensor 234 are through-beam infrared sensors. The detection beams emitted by the third level sensor 233 and the fourth level sensor 234 propagate along the width direction of the feeding channel 211. Therefore, the housing 210 is provided with a third detection position and a fourth detection position on opposite side walls along the width direction of the feeding channel 211. When the detection beam emitted by the third level sensor 233 or the fourth level sensor 234 is blocked by powder above the feeding rod 232, the third level sensor 233 or the fourth level sensor 234 will generate a detection signal, thereby obtaining the level data and transmitting it to the powder supply component.

[0070] The third level sensor 233 and the fourth level sensor 234 are configured to collect level data at the third and fourth detection positions, respectively. Furthermore, the powder supply assembly is configured to control the frequency and / or amplitude of the vibrating screen assembly 240 based on the level data from the third and fourth level sensors 233 and 234, so that the powder between the vibrating screen assembly 240 and the feed rod 232 is located in the area between the third and fourth detection positions, thereby controlling the height of the powder above the feed rod 232 within the feed channel 211.

[0071] It is understood that the powder supply component can control only the frequency or amplitude of the vibrating screen component 240, or it can control both the frequency and amplitude of the vibrating screen component 240. The powder supply component also includes a control component, which may be, but is not limited to, a host computer or a central control computer. The control component is electrically connected to the third level sensor 233, the fourth level sensor 234, and the vibrator 245 in the vibrating screen component 240, respectively. After receiving the level data transmitted by the third level sensor 233 and the fourth level sensor 234, the control component issues corresponding control commands to control the frequency and / or amplitude of the vibrating screen component 240, such as increasing or decreasing it.

[0072] By setting a third level sensor 233 and a fourth level sensor 234, the height of the powder above the feed rod 232 is detected. This allows for the control of the frequency and / or amplitude of the vibrating screen assembly 240 based on the monitoring data of the third level sensor 233 and the fourth level sensor 234, thereby controlling the height of the powder and ensuring that the powder level between the vibrating screen assembly 240 and the feed rod 232 is always between the third detection position and the fourth detection position.

[0073] In addition, with the first level sensor 223 and the second level sensor 224 installed, the control component is also electrically connected to the first level sensor 223, the second level sensor 224 and the feeding roller 230 respectively. After receiving the level data from the first level sensor 223 and the second level sensor 224, the control component issues a corresponding control command to control the rotation speed of the feeding roller 230, thereby controlling the feeding speed of the feeding channel 211.

[0074] like Figures 1 to 3 As shown, the dry coating machine according to the second aspect of the present invention includes a powder smoothing roller device as described in the first aspect of the present invention.

[0075] Understandably, dry coating machines are one of the key pieces of equipment in the battery electrode manufacturing process. They are used to uniformly coat dry powder or granular materials onto the surface of a substrate to produce battery electrodes. The structural components of a dry coating machine include an unwinding device, a coating head device, a roller device, a curing system, and a winding device. The unwinding device unwinds the substrate, and the winding device winds the coated and cured substrate. The roller device presses the powder into a uniform film, ensuring the film's thickness, density, and uniformity meet the requirements of the production process. The coating head device uniformly coats or transfers the film onto the surface of the substrate, ensuring a tight bond between the film and the substrate to form a positive or negative electrode.

[0076] This embodiment only focuses on the structural optimization and improvement of the roller device in the dry coating machine. Therefore, those skilled in the art should understand the specific structure and working principle of other components in the dry coating machine, and will not provide specific descriptions of other components here.

[0077] The dry coating machine of this embodiment adopts the roller device of the first aspect embodiment, which can realize the powder supply component to uniformly feed the roller pressing channel of the roller assembly 100 so that the roller assembly 100 can roll and form a film material with uniform density, thereby producing battery electrode sheets of better quality and ultimately improving the manufacturing quality of the battery.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A powder smoothing based roll device, characterized by, The application relates to a roller assembly (100) having a rolling channel; a powder supply assembly including a box (210) having a discharging channel (211) with an outlet opposite and communicating with the inlet of the rolling channel, and a powder smoothing mechanism (220) including a push plate (222) arranged in the discharging channel (211) and a first driving member (221) configured to drive the push plate (222) to reciprocally move in a direction perpendicular to the extending direction of the discharging channel (211) to smooth the powder before entering the rolling channel. The length of the push plate (222) extends along the thickness direction of the discharging channel (211), and the moving direction of the push plate (222) is the width direction of the discharging channel (211); and / or the first driving member (221) is an electric push rod, and the movable rod of the electric push rod penetrates through the box (210) and is fixedly connected with the push plate (222). The opposite two side walls of the discharging channel (211) are provided with containing grooves (225) for the push plate (222) to enter and exit, and the containing grooves (225) have inclined material guiding walls to make the powder in the containing grooves (225) slide to the discharging channel (211).

2. A powder-based smoothing based roller arrangement according to claim 1, characterized in that, The powder smoothing mechanism (220) is provided with two push plates (222) oppositely and spaced apart along the moving direction of the push plate (222), and two first driving members (221) are configured to drive the corresponding push plates (222) to synchronously move towards the same direction.

3. A powder-based smoothing based roller arrangement according to claim 1, characterized in that, The box (210) is provided with a first detection position and a second detection position, and the first detection position and the second detection position are respectively located on the opposite two sides of the push plate (222) along the extending direction of the discharging channel (211); the powder supply assembly further includes a first material level sensor (223) and a second material level sensor (224), and the first material level sensor (223) and the second material level sensor (224) are configured to respectively collect material level data of the first detection position and the second detection position; and the powder supply assembly is configured to control the feeding speed of the discharging channel (211) according to the material level data of the first material level sensor (223) and the second material level sensor (224) so that the powder in the discharging channel (211) is located in the region between the first detection position and the second detection position.

4. A powder-based smoothing based roller arrangement according to any one of claims 1 to 3, characterized in that The powder supply assembly further includes a vibrating screen assembly (240) and a discharging roller (230), the discharging roller (230) is configured to convey powder to the discharging channel (211), the vibrating screen assembly (240) is configured to convey powder to the discharging roller (230), and the push plate (222) is located between the discharging roller (230) and the outlet of the discharging channel (211).

5. The powder-based smoothening based roller arrangement as claimed in claim 1, wherein, ​ 6. The powder-based smoothening based roller arrangement as claimed in claim 1, wherein, ​ 7. A powder-based smoothing based roller arrangement according to claim 6, characterized in that, The downcomer roller (230) comprises a downcomer rod (232) and a second driving member (231), the length of the downcomer rod (232) extends along the width direction of the downcomer channel (211), the downcomer rod (232) is arranged in the downcomer channel (211), the outer circumferential surface of the downcomer rod (232) is provided with a plurality of feeding grooves (236) extending along the length direction of the downcomer rod (232), the plurality of feeding grooves (236) are arranged in a circumferential array along the circumferential direction of the downcomer rod (232), and the second driving member (231) is configured to drive the circumferential rotation of the downcomer rod (232) to feed the powder to the outlet direction of the downcomer channel (211).

8. A powder-based smoothing based roller arrangement according to claim 7, characterized in that, The vibrating screen assembly (240) comprises a material guide chute (241), a screen (244), and a vibrator (245), the material guide chute (241) has a material guide channel (243), the outlet of the material guide channel (243) is opposite and connected to the inlet of the downcomer channel (211), the screen (244) is arranged in the material guide channel (243), and the vibrator (245) is provided with at least one and connected to the material guide chute (241), and the vibrator (245) is configured to drive the vibration of the material guide chute (241).

9. A powder-based smoothing based roller arrangement according to claim 7, characterized in that, The box (210) is provided with a third detection position and a fourth detection position, the third detection position and the fourth detection position are arranged at intervals along the extension direction of the downcomer channel (211) and located on the same side of the downcomer rod (232) away from the push plate (222) along the extension direction of the downcomer channel (211), and the powder supply assembly further comprises a third material level sensor (233) and a fourth material level sensor (234), the third material level sensor (233) and the fourth material level sensor (234) are configured to respectively collect the material level data of the third detection position and the fourth detection position, and the powder supply assembly is configured to control the frequency and / or amplitude of the vibrating screen assembly (240) according to the material level data of the third material level sensor (233) and the fourth material level sensor (234), so that the powder between the vibrating screen assembly (240) and the downcomer rod (232) is located in the region between the third detection position and the fourth detection position.

10. A dry coater characterized by comprising: The roller device based on powder smoothing comprises the powder smoothing device based on powder smoothing according to any one of claims 1 to 9.

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