A coaxial reverse-rotation drum drying oven for negative electrode materials

Abstract

This utility model relates to the technical field of anode material drying devices, and more particularly to a coaxial reversible drum-type drying oven for anode materials. Inside the rotating drying drum used for drying materials, heating drums rotating in opposite directions are coaxially arranged. Both the heating drum and the drying drum have fixed striking rods pointing towards each other, thereby improving the efficiency of breaking up clumps of powder. Furthermore, when two adjacent striking rods are misaligned, the smaller gap allows for more thorough powder breaking. The heating drum is not connected to the drying drum. Heating components are installed inside the heating drum, and heat is conducted to the drying drum through the drum wall, thus preventing oxidizing substances such as water vapor and oxygen from entering the drying drum and oxidizing the anode material. Because the heating drum is located inside the drying drum, heat utilization is also improved.

Description

Technical Field

[0001] This utility model relates to the technical field of anode material drying devices, and in particular to a coaxial reverse-rotating drum drying oven for anode materials. Background Technology

[0002] The negative electrode materials used in lithium batteries, such as graphite, are mostly in powder form. They are prone to moisture absorption and clumping when stored for a long time. To ensure their normal performance, they need to be dried during production and the clumped powder needs to be broken back into powder.

[0003] Commonly used drying equipment includes static equipment, in which the material is placed in a basically static state, cannot be heated evenly, and clumps of powder are difficult to disperse. Patent CN106802079A – a continuous drum-type lithium battery negative electrode material heating furnace – uses external drum heating, resulting in low thermal efficiency and lacks a mechanism to disperse clumps of powder. Patent CN222378673U – a negative electrode material drying device – has a heating cylinder inside the drum, through which hot air is blown onto the drum. However, this method involves hot air containing water vapor, oxygen, and other gases that come into contact with and oxidize the negative electrode material upon entering the drum, which is also detrimental to the drying of the negative electrode material. Furthermore, although baffles are installed on the inner wall of the drum, the material tumbles with the drum, resulting in poor dispersion. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a coaxial reverse-rotating drum drying oven for negative electrode materials. A heating cylinder is coaxially arranged inside the drying drum, utilizing the cylinder wall to dissipate heat outwards, thereby improving thermal efficiency and preventing gas from entering the drying drum and oxidizing the negative electrode material. Furthermore, the heating cylinder rotates in the opposite direction to the drying drum, and both the drying drum and the heating cylinder are equipped with striking rods, which improves the efficiency and quality of breaking up agglomerated powder.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a coaxial double-drum drying device with opposite rotation directions, including a drying drum, a heating drum coaxially arranged inside the drying drum, the rotation direction of the heating drum being opposite to that of the drying drum, a plurality of center-pointing rods fixed on the inner wall of the drying drum, a plurality of center-pointing rods fixed on the outer wall of the heating drum, and at least three pusher plates extending along the length direction of the drying drum are arranged inside the drying drum, the heating drum is not connected to the drying drum, and a heating component is arranged inside the heating drum.

[0006] Preferably, any one of the striking rods and the striking rod two can be a group, and the minimum gap between the striking rods one and the striking rod two in this group during relative movement is less than 10mm.

[0007] Preferably, the cross-sections of the first and second striking rods are rectangular or prismatic, and the plane containing two opposite edges of the first or second striking rod is perpendicular to the axis of the drying cylinder.

[0008] Preferably, the wall thickness of the drying cylinder is less than 6 mm, and the drying cylinder is provided with reinforcing ribs or reinforcing rods inside.

[0009] Preferably, the heating assembly includes a heating element and a fan that blows the heat generated by the heating element into the heating cylinder.

[0010] Preferably, the heating cylinder is a cylinder with one end open and the other end closed, with the closed end being the bottom end. The heating component is disposed at the open end, and the heating cylinder is provided with a return air pipe connecting the bottom of the heating cylinder and the section of the heating cylinder located at the air inlet end of the fan.

[0011] A coaxial reverse-rotation drum dryer for negative electrode materials includes a base frame, with a feeding bin and a discharging bin respectively located at both ends of the base frame. A drying cylinder is rotatably connected between the feeding bin and the discharging bin. The base frame is provided with rollers to support the drying cylinder. A gear ring is coaxially fixed to the outer wall of the drying cylinder. The base frame is provided with a gear driven by a motor, and the gear ring meshes with the gear.

[0012] A heating cylinder is coaxially arranged inside the drying cylinder. The two ends of the heating cylinder are rotatably connected to the feeding bin and the discharging bin, respectively. A pulley is provided at the outer end of the heating cylinder located in the feeding bin. A second motor is provided on the base frame. The second motor is connected to the pulley via belt drive.

[0013] The heating cylinder and the drying cylinder rotate in opposite directions. Both the drying cylinder and the heating cylinder are fixed with levers pointing towards each other. The heating cylinder and the drying cylinder are not connected. The inner wall of the drying cylinder is provided with a pusher plate. The heating cylinder is provided with a heating component inside.

[0014] The top of the feeding hopper is provided with a feeding port, the section of the heating cylinder located inside the feeding hopper is provided with a feeding screw, the bottom of the discharging hopper is provided with a discharging port, and the top of the discharging hopper is provided with an exhaust chimney.

[0015] Preferably, a sealing device is provided at the connection between the drying cylinder and the feeding hopper and the discharging hopper to prevent dust from escaping; the heating cylinder is rotatably connected to the feeding hopper and the discharging hopper through bearings or bushings, and a sealing ring is provided at the connection between the heating cylinder and the feeding hopper and the discharging hopper to prevent dust from escaping.

[0016] Preferably, the exhaust chimney is equipped with a filter screen to prevent dust from escaping.

[0017] Preferably, both the feed inlet and the discharge outlet are equipped with gate valves for opening and closing.

[0018] Preferably, a base is also provided, the middle part of the base frame is hinged to the base, and the base is provided with a hydraulic cylinder that can drive the base frame to tilt.

[0019] The beneficial effects of this utility model are as follows: A coaxial reverse-rotation drum-type dryer for negative electrode materials has heating cylinders with opposite rotation directions arranged coaxially inside the rotating drying drum used for drying materials. Both the heating cylinder and the drying drum have fixed striking rods pointing towards each other, which can improve the efficiency of breaking up lumpy powder. When two adjacent striking rods are misaligned, the small gap allows for more thorough powder breaking. The heating cylinder and the drying drum are not connected. The heating cylinder is equipped with heating components inside and conducts heat to the drying drum through the cylinder wall, thereby preventing oxidizing substances such as water vapor and oxygen from entering the drying drum and oxidizing the negative electrode material. Because the heating cylinder is located inside the drying drum, the heat utilization rate is also improved. Attached Figure Description

[0020] Figure 1 This is a three-dimensional view of a coaxial reverse-rotating drum drying oven for negative electrode materials;

[0021] Figure 2 This is a front view of a coaxial reverse-rotation drum dryer for negative electrode materials.

[0022] Figure 3 yes Figure 2 The right view;

[0023] Figure 4 yes Figure 2 AA section view;

[0024] Figure 5 yes Figure 3 BB cross-sectional view.

[0025] Explanation of reference numerals in the attached figures:

[0026] 101 – Base, 201 – Base frame, 202 – Roller, 203 – Motor 1, 204 – Gear, 205 – Motor 2, 301 – Drying cylinder, 302 – Striking rod 1, 303 – Pusher plate, 304 – Gear ring, 401 – Heating cylinder, 402 – Striking rod 2, 403 – Heating component, 403a – Heating element, 403b – Fan, 404 – Return air duct, 405 – Pulley, 406 – Feed screw, 501 – Feed bin, 502 – Feed inlet, 601 – Discharge bin, 602 – Discharge outlet, 603 – Exhaust chimney. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the present invention.

[0028] like Figure 1-5 As shown in the figure, this embodiment describes a coaxial reverse-rotation drum drying oven for negative electrode materials, taking the drying of powder materials, such as graphite powder, as an example.

[0029] This drying oven can continuously dry materials. It includes a base frame 201, with a feed hopper 501 and a discharge hopper 601 fixed at both ends. A drying cylinder 301 is supported in the middle by rollers 202 and a motor 203 is installed. A gear 204 is fixed to the shaft end of the motor 203. A gear ring 304 is coaxially fixed to the outer wall of the drying cylinder 301. The gear 204 meshes with the gear ring 304. When the motor 203 rotates, it can drive the drying cylinder 301 to rotate. In addition, the two ends of the drying cylinder 301 can be rotatably connected to the feed hopper 501 and the discharge hopper 601 through a rotary flange or bearing, and a sealing device is provided at the connection to prevent powder from escaping.

[0030] The top of the feeding hopper 501 is provided with a feeding port 502, the bottom of the discharging hopper 601 is provided with a discharging port 602, and the top of the discharging hopper 601 is provided with an exhaust chimney 603. Both the feeding port 502 and the discharging port 602 are provided with gate valves that block or open the channels. The gate valves are plate-type and are slidably connected to the feeding port 502 or the discharging port 602, and are manually opened and closed. The exhaust chimney 603 is provided with a filter screen or filter cotton to prevent the powder from escaping and only allow the water vapor generated by the drying of the graphite powder to be discharged.

[0031] A heating cylinder 401 is coaxially arranged inside the drying cylinder 301. The heating cylinder 401 is not connected to the drying cylinder 301. The heating cylinder 401 is a cylinder with one end open and the other end closed. The closed end is the bottom end, and the open end is provided with a heating component 403. The heating component 403 includes a heating element 403a and a fan 403b that blows the heat generated by the heating element 403a into the heating cylinder 401.

[0032] Because the heating cylinder 401 is sealed, this embodiment provides a return air pipe 404 on the outside of the heating cylinder 401, connecting the bottom of the heating cylinder 401 and the section of the heating cylinder 401 located at the air inlet end of the fan 403b. This allows the gas at the bottom of the heating cylinder 401 to flow back to the air inlet end of the fan 403b, which on the one hand facilitates the continued blowing of air into the heating cylinder 401, and on the other hand makes fuller use of the waste heat.

[0033] In order to prevent the motor driving the fan 403b from overheating, this embodiment lengthens the drive shaft between the fan 403b and the drive motor, and the air outlet of the return air pipe 404 is located between the fan 403b and the drive motor, and is far away from the drive motor.

[0034] The heating cylinder 401 is rotatably connected to the feed hopper 501 and the discharge hopper 601 at both ends via bearings or bushings, and a sealing ring is provided at the connection to prevent graphite powder from escaping. A pulley 405 is fixed to the end of the heating cylinder 401 that protrudes from the wall of the discharge hopper 601. A second motor 205 is provided on the base frame 201, and the second motor 205 drives the heating cylinder 401 to rotate via belt drive.

[0035] Because this embodiment relies on the wall of the heating cylinder 401 to conduct heat to the drying cylinder 301, the wall thickness of the heating cylinder 401 is relatively thin. In order to ensure the strength and rigidity of the heating cylinder 401 and prevent it from deforming during rotation, the heating cylinder 401 is provided with reinforcing ribs or reinforcing rods along its length, and in particular, reinforcing shafts can be provided at both ends to connect with bearings or bushings.

[0036] The heating cylinder 401 rotates in the opposite direction to the drying cylinder 301. The inner wall of the drying cylinder 301 is fixed with several center-pointing striking rods 302, and the outer wall of the heating cylinder 401 is fixed with several second striking rods 402 pointing towards the inner wall of the drying cylinder 301. At least three pusher plates 303 extending along the length of the drying cylinder 301 are provided inside the drying cylinder 301. In this embodiment, viewed from the feeding end, the drying cylinder 301 rotates counterclockwise, while the heating cylinder 401 rotates clockwise.

[0037] In order to facilitate the graphite powder from the feed inlet 502 to the drying cylinder 301, the heating cylinder 401 is provided with a feed screw 406 from the lower section of the feed inlet 502 to the section entering the drying cylinder 301 by at least 100 mm. The feed screw 406 rotates with the heating cylinder 401 to deliver the graphite powder falling from the top to the drying cylinder 301.

[0038] In order to make it easier for graphite powder to move along the drying cylinder 301, this embodiment also provides a base 101. The middle part of the base frame 201 is hinged to the base 101, and the base 101 is provided with a hydraulic cylinder that can drive the base frame 201 to tilt.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and for the convenience of describing the technical solution, the front, back, left, right, top, middle, and bottom orientations are based on the accompanying drawings and are not a limitation on the protection scope of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the essence and scope of the technical solution of this utility model.

Claims

1. A negative electrode material coaxial reverse direction roller type drying furnace, characterized by: The device includes a base frame, with a feeding bin and a discharging bin at each end of the base frame. A drying cylinder is rotatably connected between the feeding bin and the discharging bin. The base frame is equipped with rollers to support the drying cylinder. A gear ring is coaxially fixed to the outer wall of the drying cylinder. The base frame is also equipped with a gear driven by a motor, and the gear ring meshes with the gear. A heating cylinder is coaxially arranged inside the drying cylinder. The rotation direction of the heating cylinder is opposite to that of the drying cylinder. Several center-pointing rods are fixed on the inner wall of the drying cylinder, and several center-pointing rods are fixed on the outer wall of the heating cylinder. At least three pusher plates extending along the length of the drying cylinder are arranged inside the drying cylinder. The heating cylinder is not connected to the drying cylinder, and a heating component is arranged inside the heating cylinder. The heating cylinder is rotatably connected to the feeding bin and the discharging bin at both ends. A feeding screw is provided in the section of the heating cylinder located inside the feeding bin. A feeding port is provided at the top of the feeding bin, and a discharging port is provided at the bottom of the discharging bin.

2. The negative material coaxial reverse direction roller type drying furnace according to claim 1, characterized in that: Any one of the striking rods and the striking rod two can be a group, and the minimum gap between the striking rods one and the striking rod two in this group during relative movement is less than 10mm.

3. The negative material coaxial reverse direction roller type drying furnace according to claim 1, characterized in that: The cross-sections of the first and second striking rods are rectangular or prismatic, and the plane containing two opposite edges of the first or second striking rod is perpendicular to the axis of the drying cylinder.

4. The negative material coaxial reverse direction roller type drying furnace according to claim 1, characterized in that: The wall thickness of the drying cylinder is less than 6mm, and the drying cylinder is provided with reinforcing ribs or reinforcing rods inside.

5. The coaxial reverse-rotating drum drying oven for negative electrode materials according to claim 1, characterized in that: The heating assembly includes a heating element and a fan that blows the heat generated by the heating element into the heating cylinder.

6. The coaxial reverse direction drum dryer for negative electrode material according to claim 5, characterized in that: The heating cylinder is a cylinder with one end open and the other end closed, with the closed end being the bottom. The heating component is located at the open end, and the outside of the heating cylinder is provided with a return air pipe that connects the bottom of the heating cylinder and the section of the heating cylinder located at the air inlet of the fan.

7. The negative material coaxial reverse direction roller type drying furnace according to claim 1, characterized in that: The connection between the drying cylinder and the feeding hopper and the discharging hopper is provided with a sealing device to prevent dust from escaping; the heating cylinder is rotatably connected to the feeding hopper and the discharging hopper through bearings or bushings, and the connection between the heating cylinder and the feeding hopper and the discharging hopper is provided with a sealing ring to prevent dust from escaping.

8. The negative material coaxial reverse direction roller type drying furnace according to claim 1, characterized in that: Both the feed inlet and the discharge outlet are equipped with gate valves for opening and closing.

9. The negative material coaxial reverse direction roller type drying furnace according to claim 1, characterized in that: It is also provided with a base, the middle part of the base frame is hinged to the base, and the base is provided with a hydraulic cylinder that can drive the base frame to tilt.

Images