Roller kiln for negative electrode material carbonization

Abstract

The utility model discloses a roller kiln for negative electrode material carbonization, which belongs to the technical field of negative electrode material production, and comprises a horizontally arranged frame body, a plurality of roller columns are uniformly arranged in the frame body along the left-right direction, each roller column is driven by a first driving device to synchronously rotate in the same direction, and a kiln body is arranged above the frame body. The kiln body is of an inverted U-shaped structure, and a plurality of L-shaped rods are fixedly arranged on the lower end faces of front and rear side plates of the kiln body in the left-right direction. By arranging the second driving device, the L-shaped rod and the kiln body, when the kiln body needs to be repaired and maintained regularly in use, the second driving device drives the L-shaped rod to move upwards, so that the L-shaped rod drives the kiln body to move upwards, and the height between the vault of the kiln body and the roller column below is increased; and therefore, the operation space for maintaining the interior of the kiln body is increased, the maintenance of the inner side wall of the kiln body is facilitated, the maintenance time is shortened, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of negative electrode material production, and particularly relates to a roller hearth kiln for carbonizing negative electrode materials. Background Art

[0002] The negative electrode material is the active material for the negative electrode reaction in the battery. The performance of the negative electrode material directly affects key performance indicators of the battery such as capacity, power, and cycle life. The pre-carbonization process is an important step in the preparation of negative electrode materials. By pre-carbonizing at high temperature, a carbonaceous conductive network is formed in the negative electrode material, thereby improving the conductivity and stability of the battery. The principle of the pre-carbonization of negative electrode materials is that under certain temperature and atmosphere conditions, the organic matter in the original negative electrode material undergoes a carbonization reaction to form a carbonaceous structure. Such pre-carbonization treatment can endow the negative electrode material with higher conductivity, better mechanical stability, and improved interfacial stability with the electrolyte.

[0003] Currently, the equipment used for carbonizing negative electrode materials includes a roller hearth kiln. First, the raw materials enter the roller hearth kiln from one side. The roller columns arranged at equal distances rotate synchronously in the same direction to drive the materials to move horizontally. Carbonization occurs while moving, and the moving speed can be adjusted by adjusting the rotation speed of the roller columns. Generally, the carbonization time of negative electrode materials is longer than that required for carbonizing other materials, so the rotation speed can be adjusted slower. After cooling, carbon is discharged.

[0004] The existing roller hearth kiln has an inverted U-shaped arch structure. Below are roller columns arranged at equal distances for transporting negative electrode materials. A combustion chamber is provided below the roller hearth kiln and below the roller columns. High-temperature flue gas can be generated through the combustion of a burner. The high-temperature flue gas rises into the roller hearth kiln to heat and carbonize the negative electrode materials above the roller columns. Carbonization occurs while moving. In order to maintain a sufficiently high temperature inside the roller hearth kiln and reduce heat loss, the arch roof of the roller hearth kiln is designed to be relatively low. The inner sidewall of the roller hearth kiln is attached with dense refractory bricks. After long-term use, the refractory bricks are damaged and need to be replaced. However, due to the low design of the arch roof of the roller hearth kiln, the operating space is narrow, which is not convenient for the later maintenance of the roller hearth kiln and increases problems such as maintenance time. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a roller hearth kiln for carbonizing negative electrode materials, which has the advantage of being convenient for later internal maintenance of the roller hearth kiln, and effectively solves the problems of narrow operating space, inconvenient later maintenance of the roller hearth kiln, and increased maintenance time.

[0006] The utility model adopts the following technical scheme: A roller hearth kiln for carbonizing negative electrode materials, including a horizontally arranged frame body, inside which a number of roller columns are evenly arranged in the left-right direction, each roller column is driven by a first driving device to rotate synchronously and in the same direction. Above the frame body, there is a kiln body, which is an inverted U-shaped structure. At the lower end surfaces of the front and rear side plates of the kiln body, a number of L-shaped rods are fixedly arranged in the left-right direction. Each L-shaped rod passes through between the corresponding two roller columns and is slidably arranged in the vertical direction with a combustion chamber fixedly arranged below; on the inner side wall of the kiln body, a number of refractory bricks are evenly arranged; below the L-shaped rod, there is a second driving device, and the output end of the second driving device is connected to the corresponding L-shaped rod.

[0007] Further, on the rod bodies on the front and rear sides of the frame body, a number of vertical plate groups are fixedly arranged in the left-right direction. Each vertical plate group is composed of two vertical plates arranged in the up-down direction and having a set spacing inside the rod body; the spacing between the two vertical plates of each vertical plate group is adapted to the width of the L-shaped rod.

[0008] Further, the L-shaped rods are arranged in order from left to right. The odd-numbered L-shaped rods are all slidably arranged in the corresponding vertical plate groups in the vertical direction. Vertical notches are opened at the positions of the frame body corresponding to the corresponding L-shaped rods between every two adjacent vertical plate groups.

[0009] Further, the second driving device includes a fixedly arranged hydraulic telescopic rod. The hydraulic telescopic rod is located between the corresponding two vertical plate groups, and the output end of the hydraulic telescopic rod is fixedly arranged with the corresponding L-shaped rod.

[0010] Further, on the upper end surfaces of the front and rear side plates of the combustion chamber, accommodation grooves adapted to the L-shaped rods are opened in the left-right direction.

[0011] Further, round holes are opened on the horizontal parts of each L-shaped rod and each vertical plate.

[0012] Further, on the outer side surface of the rod body on the rear side of the frame body at the position corresponding to the kiln body, a guard plate is fixedly arranged, and the guard plate is fixedly arranged with the frame body between the rear vertical plate groups.

[0013] Further, the guard plate is fixedly arranged with the frame body through a number of bolts.

[0014] Further, on the front side surface of each roller column, a rotating shaft is coaxially fixedly arranged. Each rotating shaft is rotatably connected to the rod body on the front side of the frame body. At the front end of each rotating shaft, a first bevel gear is fixedly arranged. In front of the frame body, a transmission shaft is horizontally arranged with the rod body on the front side of the frame body. The transmission shaft is rotatably connected to the frame body through end plates at both ends. A number of second bevel gears are fixedly arranged on the transmission shaft in the left-right direction. Each second bevel gear is meshed with the corresponding first bevel gear. The first driving device includes a motor fixedly arranged on the outer side surface of the right end plate. The output shaft of the motor is fixedly arranged with the right end of the transmission shaft.

[0015] Furthermore, bottom plates are fixedly arranged at the bottoms of the front and rear side surfaces of the combustion chamber, and the fixed ends of the hydraulic telescopic rods on the front and rear sides are fixedly arranged with the corresponding bottom plates below.

[0016] 1. By providing the second driving device, the L-shaped rod and the kiln body, when the kiln body needs to be repaired and maintained regularly during use, the second driving device drives the L-shaped rod to move upward, so that the L-shaped rod drives the kiln body to move upward, thereby increasing the height between the vault of the kiln body and the roller columns below, further increasing the operation space for repairing and maintaining the inside of the kiln body, facilitating the maintenance of the inner side wall of the kiln body, shortening the repair and maintenance time, and improving the repair efficiency.

[0017] 2. By opening round holes on each L-shaped rod and each vertical plate, when the kiln body moves downward to the set working position, the double-headed bolts are passed through the round holes of each L-shaped rod and the vertical plate, and then nuts are screwed on both ends of the double-headed bolts to fix the L-shaped rod, thereby fixing the position of the kiln body and achieving the purpose of fixing the kiln body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall three-dimensional structure schematic diagram of the present invention;

[0019] Figure 2 is the front view structure schematic diagram of the present invention;

[0020] Figure 3 is the three-dimensional structure schematic diagram of the transmission shaft in the present invention;

[0021] Figure 4 is the three-dimensional structure schematic diagram of the hydraulic telescopic rod in the present invention;

[0022] Figure 5 is in the present invention Figure 4 is the enlarged schematic diagram of the structure at A in;

[0023] Figure 6 is the three-dimensional structure schematic diagram of the first bevel gear in the present invention;

[0024] Figure 7 is the three-dimensional structure schematic diagram of the roller column in the present invention;

[0025] Figure 8 is the three-dimensional structure schematic diagram of the kiln body in the present invention;

[0026] Figure 9 is the three-dimensional structure schematic diagram of the vertical plate in the present invention;

[0027] Figure 10 is the three-dimensional structure schematic diagram of the guard plate in the present invention;

[0028] Figure 11 is a three-dimensional structural schematic diagram of the bottom plate in the present utility model;

[0029] Figure 12 is a three-dimensional structural schematic diagram of the separated state of the kiln body and the frame body in the present utility model;

[0030] Figure 13 is a three-dimensional structural schematic diagram of the L-shaped rod in the present utility model.

[0031] In the figure, 1. Frame body; 2. Roller column; 3. Kiln body; 4. L-shaped rod; 5. Combustion chamber; 6. Rod body; 7. Vertical plate; 8. Vertical notch; 9. Hydraulic telescopic rod; 10. Accommodation groove; 11. Round hole; 12. Stud bolt; 13. Guard plate; 14. Rotating shaft; 15. First bevel gear; 16. Second bevel gear; 17. Transmission shaft; 18. End plate; 19. Motor; 20. Bottom plate; 21. Flue gas pipeline. Specific embodiments

[0032] Please refer to Figures 1-13 , and the present utility model will be described in detail below in conjunction with the accompanying drawings and embodiments:

[0033] The roller hearth kiln for carbonizing the negative electrode material described in the present utility model includes a horizontally arranged frame body 1. Inside the frame body 1, a number of roller columns 2 are evenly arranged in the left-right direction. Each roller column 2 is driven by a first driving device to rotate synchronously in the same direction. Above the frame body 1, there is a kiln body 3. The kiln body 3 is of an inverted U-shaped structure. At the lower end surfaces of the front and rear side plates of the kiln body 3, a number of L-shaped rods 4 are fixedly arranged in the left-right direction. Each L-shaped rod 4 passes between the corresponding two roller columns 2 and is slidably arranged in the up-down direction with a combustion chamber 5 fixedly arranged below; when the first driving device drives each roller column 2 to rotate synchronously in the same direction, it drives the material placed above the roller columns 2 to move, so that the material above the roller columns 2 enters from one side of the kiln body 3 and exits from the other side of the kiln body 3. When the material moves inside the kiln body 3, the high-temperature flue gas generated by the flame in the combustion chamber 5 enters the kiln body 3 to heat the material, achieving the purpose of heating and carbonizing the negative electrode material; a number of refractory bricks are evenly arranged on the inner side wall of the kiln body 3; during the use of the roller hearth kiln, when maintaining the kiln body 3, due to the relatively low arch top of the kiln body 3 and the narrow maintenance space, the operation is inconvenient, especially when replacing the refractory bricks on the inner side wall of the kiln body 3. To solve the above problems, a second driving device is arranged below the L-shaped rod 4. The output end of the second driving device is connected to the corresponding L-shaped rod 4. When the second driving device drives the corresponding L-shaped rod 4 to move upward, the L-shaped rod 4 drives the kiln body 3 to move upward, increasing the distance between the arch top of the kiln body 3 and the roller columns 2 below, facilitating the maintenance and repair of the kiln body 3 by the operator; at the same time, the kiln body 3 slides in the up-down direction with the combustion chamber 5 through the L-shaped rod 4. The second driving device drives the kiln body 3 to move up and down, and at the same time, the second driving device positions the kiln body 3 at the working position above the roller columns 2, so that the kiln body 3 is at the set working position above the roller columns 2. The working position: the lower end surface of the kiln body 3 does not contact the roller columns 2 to avoid affecting the rotation of the roller columns 2; at the same time, the distance between the lower end surface of the kiln body 3 and the roller columns 2 cannot be too large to cause heat loss.

[0034] In order to increase the smoothness of the up-down movement of the L-shaped rod 4, in this embodiment, a number of vertical plate groups are fixedly arranged in the left-right direction on the rod bodies 6 on the front and rear sides of the frame body 1. Each vertical plate group is composed of two vertical plates 7 arranged in the up-down direction inside the rod body 6 with a set spacing; the spacing between the two vertical plates 7 of each vertical plate group is adapted to the width of the L-shaped rod 4; when the L-shaped rod 4 moves up and down, the L-shaped rod 4 slides up and down between the corresponding two vertical plates 7, increasing the smoothness of the up-down movement of the L-shaped rod 4.

[0035] In this embodiment, the sorting order of the L-shaped rods 4 is from left to right. The odd-numbered L-shaped rods 4 are all slidably arranged in the corresponding vertical plate groups in the up-and-down direction. Vertical notches 8 are provided at the corresponding positions of the frame body 1 between every two adjacent vertical plate groups and the corresponding L-shaped rods 4. During use, when the kiln body 3 needs to move upward, the corresponding L-shaped rods 4 are driven to move up and down by the second driving device, so that the kiln body 3 moves upward. During the upward movement of the L-shaped rods 4, the odd-numbered L-shaped rods 4 move upward in the corresponding vertical plate groups, and the even-numbered L-shaped rods 4 move upward from the corresponding vertical notches 8.

[0036] In order to achieve the purpose of driving the kiln body 3 to move upward, in this embodiment, the second driving device includes a fixedly arranged hydraulic telescopic rod 9. The hydraulic telescopic rod 9 is located between the corresponding two vertical plate groups. The output end of the hydraulic telescopic rod 9 is fixedly arranged with the corresponding L-shaped rod 4. The up-and-down movement of the L-shaped rod 4 is realized by the telescopic movement of the hydraulic telescopic rod 9, and further the purpose of driving the kiln body 3 to move up and down is achieved.

[0037] In order to achieve the purpose of positioning the position of the kiln body 3 during operation, in this embodiment, receiving grooves 10 adapted to the L-shaped rods 4 are provided on the upper end surfaces of the front and rear side plates of the combustion chamber 5 in the left-right direction. When the kiln body 3 moves downward, each L-shaped rod 4 moves downward and falls into the corresponding receiving groove 10. When the lower end surfaces of the L-shaped rods 4 are all in contact with the inner bottom wall of the receiving groove 10, it means that the kiln body 3 has moved downward to the set working position. At this time, the hydraulic telescopic rod 9 stops contracting. The working position of the kiln body 3 is that the lower end surface of the kiln body 3 does not contact the roller 2 and affect the rotation of the roller 2, and the gap between the lower end surface of the kiln body 3 and the roller 2 cannot be too large to cause heat loss.

[0038] In order to achieve the purpose of locking the kiln body 3 at the working position, in this embodiment, round holes 11 are provided on the horizontal parts of each L-shaped rod 4 and each vertical plate 7. After the kiln body 3 moves downward to the set working position, the double-headed bolts 12 are passed through the round holes 11 of each L-shaped rod 4 and the vertical plate 7, and then nuts are screwed on both ends of the double-headed bolts 12 to fix the L-shaped rods 4, and further fix the position of the kiln body 3.

[0039] In order to increase the stability of the rod body 6 at the rear side of the frame body 1, in this embodiment, a guard plate 13 is fixedly arranged on the outer side surface of the rod body 6 at the rear side of the frame body 1 corresponding to the kiln body 3. The guard plates 13 are all fixedly arranged with the frame body 1 between the rear vertical plate groups, increasing the stability of the frame body 1.

[0040] In this embodiment, the guard plate 13 is fixedly arranged with the frame body 1 through a plurality of bolts.

[0041] In order to achieve the purpose of driving each roller 2 to rotate synchronously and in the same direction, in this embodiment, a rotating shaft 14 is coaxially and fixedly arranged on the front side of each roller 2. Each rotating shaft 14 is rotatably connected to the rod body 6 on the front side of the frame body 1. A first bevel gear 15 is fixedly arranged at the front end of each rotating shaft 14. A transmission shaft 17 is horizontally arranged in front of the frame body 1 and parallel to the rod body 6 on the front side of the frame body 1. The transmission shaft 17 is rotatably connected to the frame body 1 through end plates 18 at both ends. A plurality of second bevel gears 16 are fixedly arranged on the transmission shaft 17 in the left-right direction. Each second bevel gear 16 meshes with the corresponding first bevel gear 15. The driving device includes a motor 19 fixedly arranged on the outer side surface of the right end plate 18. The output shaft of the motor 19 is fixedly connected to the right end of the transmission shaft 17. During use, the motor 19 rotates to drive the transmission shaft 17 to rotate, so that the transmission shaft 17 drives each second bevel gear 16 to rotate. Further, the second bevel gear 16 drives each first bevel gear 15 to rotate. Further, each roller 2 is driven to rotate through the rotating shaft 14, achieving the purpose of synchronous and co-directional rotation of each roller 2. During the production process, the negative electrode material is placed on the roller 2, so that the motor 19 drives each roller 2 to rotate synchronously and in the same direction, thereby driving the negative electrode material to enter from one side of the kiln body 3 and exit from the other side of the kiln body 3. At the same time, the high-temperature gas in the combustion chamber 5 rises and enters the interior of the kiln body 3 to heat the negative electrode material passing on the roller 2, carbonizing the negative electrode material.

[0042] In this embodiment, bottom plates 20 are fixedly arranged at the bottoms of the front and rear side surfaces of the combustion chamber 5. The fixed ends of the hydraulic telescopic rods 9 on the front and rear sides are fixedly arranged with the corresponding bottom plates 20 below.

[0043] In this embodiment, the outer surface of each vertical plate 7 is fixedly arranged with the outer side surface of the combustion chamber 5.

[0044] In this embodiment, a smoke pipe 21 is arranged on the upper end surface of the kiln body 3. The pipe of the smoke pipe 21 communicating with the inside of the kiln body 3 is slidably arranged in the kiln body 3 in the up-down direction. When the kiln body 3 moves upward, the smoke pipe 21 remains stationary, and the kiln body 3 moves upward, causing the smoke pipe 21 to move downward relative to the kiln body 3.

[0045] Working principle of the utility model: During use, first place the negative electrode material on the roller 2, and then start the motor 19, so that the motor 19 drives each roller 2 to rotate synchronously and in the same direction in sequence through the transmission shaft 17, the second bevel gear 16, the first bevel gear 15 and the rotating shaft 14, enabling the negative electrode material to be transported by the roller 2, enter from one side of the kiln body 3, and exit from the other side of the kiln body 3. At the same time, the high-temperature gas in the combustion chamber 5 rises into the interior of the kiln body 3 to heat the negative electrode material passing on the roller 2, causing the negative electrode material to be carbonized, thus achieving the purpose of carbonizing the negative electrode material. When maintenance of the interior of the kiln body 3 is required, first unscrew and remove the nuts at both ends of the double-headed bolt 12, then extract the double-headed bolt 12, and then jack it up through the hydraulic telescopic rod 9 and jack up the kiln body 3 through the L-shaped rod 4, increasing the distance between the kiln body 3 and the lower roller 2 to increase the operating space, facilitating personnel to maintain the inner wall of the kiln body 3, such as replacing refractory bricks, etc.

Claims

1. A roller kiln for carbonizing negative electrode materials, characterized in that: The invention comprises a frame (1) arranged horizontally, wherein a plurality of rollers (2) are evenly arranged inside the frame (1) along the left-right direction, each roller (2) is driven by a first driving device to rotate synchronously in the same direction, a kiln body (3) is arranged above the frame (1), the kiln body (3) is an inverted U-shaped structure, a plurality of L-rods (4) are fixedly arranged on the lower end surfaces of two side plates in front and behind the kiln body (3) along the left-right direction, each L-rod (4) passes through between two corresponding rollers (2) and slides in the combustion chamber (5) fixedly arranged below; a plurality of refractory bricks are evenly arranged on the inner side wall of the kiln body (3); a second driving device is arranged below the L-rod (4), and the output end of the second driving device is connected to the corresponding L-rod (4).

2. The roller kiln for carbonizing negative electrode materials according to claim 1, characterized in that: A plurality of vertical plate groups are fixedly arranged on the rod bodies (6) at the front and rear sides of the frame body (1) along the left-right direction, and each vertical plate group is composed of two vertical plates (7) arranged in the rod body (6) in the up-down direction and having a set spacing; the spacing between the two vertical plates (7) of each vertical plate group is adapted to the width of the L rod (4).

3. The roller kiln for carbonizing negative electrode materials according to claim 2, characterized in that: The L rods (4) are arranged in order from left to right, and odd-numbered L rods (4) are all slidably arranged in the corresponding vertical plate groups along the up-down direction, and vertical notches (8) are provided at positions corresponding to the corresponding L rods (4) on the frame (1) between each two adjacent vertical plate groups.

4. The roller kiln for carbonizing negative electrode materials according to claim 3, characterized in that: The second driving device comprises a fixedly arranged hydraulic telescopic rod (9), the hydraulic telescopic rod (9) being located between the corresponding two vertical plate groups, and the output end of the hydraulic telescopic rod (9) being fixedly arranged with the corresponding L rod (4).

5. The roller kiln for carbonizing negative electrode materials according to claim 4, characterized in that: The upper end surfaces of the front and rear side plates of the combustion chamber (5) are both provided with accommodation grooves (10) along the left-right direction and adapted to fit the L-rod (4).

6. The roller kiln for carbonizing negative electrode materials according to claim 5, characterized in that: A circular hole (11) is provided in the horizontal portion of each L-rod (4) and each vertical plate (7).

7. The roller kiln for carbonizing negative electrode materials according to claim 3, characterized in that: A guard plate (13) is fixedly provided on the outer side surface of the rod body (6) at the rear side of the frame body (1) corresponding to the kiln body (3), and the guard plate (13) is fixedly provided on the frame body (1) between the vertical plate groups at the rear side.

8. The roller kiln for carbonizing negative electrode materials according to claim 7, characterized in that: The guard plate (13) is fixed to the frame (1) via a plurality of bolts.

9. The roller kiln for carbonizing negative electrode materials according to claim 2, characterized in that: A rotating shaft (14) is coaxially fixedly arranged on the front side of each roller (2), each rotating shaft (14) is rotatably connected to the rod body (6) on the front side of the frame (1), a first bevel gear (15) is fixedly arranged at the front end of each rotating shaft (14), a transmission shaft (17) is horizontally arranged in front of the frame (1) and the rod body (6) on the front side of the frame (1), the transmission shaft (17) is rotatably connected to the frame (1) through end plates (18) at both ends, a plurality of second bevel gears (16) are fixedly arranged on the transmission shaft (17) in the left and right directions, each second bevel gear (16) is meshed with the corresponding first bevel gear (15), and the first driving device includes a motor (19) fixedly arranged on the outer side of the right end plate (18), and the output shaft of the motor (19) is fixedly arranged on the right end of the transmission shaft (17).

10. The roller kiln for carbonizing negative electrode materials according to claim 4, characterized in that: Bottom plates (20) are fixedly arranged at the bottom of both front and rear side surfaces of the combustion chamber (5), and fixed ends of the hydraulic telescopic rods (9) on both front and rear sides are fixedly arranged on the corresponding bottom plates (20) below.

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