Artificial graphite coating, granulating and pre-carbonizing all-in-one machine

Abstract

Belonging to the technical field of battery cathode material production, the invention discloses an artificial graphite coating granulation pre-carbonization all-in-one machine, which comprises a cylinder, a kiln head cover rotatably mounted at the left end of the cylinder, a kiln tail smoke chamber rotatably mounted at the right end of the cylinder, and a transmission mechanism mounted on the left side of the outer end of the cylinder. A granulation section heating mechanism and a carbonization section heating mechanism which are used for heating materials in the barrel are sequentially arranged at the outer end of the barrel from left to right, and the transmission mechanism is connected with the kiln head cover; the granulation section heating mechanism, the carbonization section heating mechanism, the kiln head cover and the kiln tail smoke chamber are all hermetically connected with the cylinder body through sealing assemblies; and a plurality of groups of supporting devices are mounted at the outer end of the cylinder body. By means of the mode, the coating, granulating and pre-carbonizing integrated production is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of battery negative electrode material production, and in particular to an artificial graphite coating granulation pre-carbonization integrated machine. Background Art

[0002] With the development of new energy vehicles, the demand for the quantity and quality of negative electrode materials for lithium-ion batteries is increasing. The production of negative electrode materials has a complex process flow, which can be divided into four major steps (pretreatment, granulation, graphitization, ball milling and screening) and more than ten small processes.

[0003] In the production process of negative electrode materials for lithium-ion batteries (artificial graphite negative electrode), traditional coating and granulation are all produced by intermittent reactors, which have the obvious disadvantages of high energy consumption, low production capacity and serious pollution. The low-temperature carbonization process is currently widely used. The coated materials can not only increase the furnace loading during the graphitization process, but also improve the quality of the products after graphitization through low-temperature carbonization. At present, the carbonization method of roller kiln or tunnel kiln is generally used in the industry, that is, the materials to be carbonized at low temperature are loaded into the crucible, and the kiln car is loaded into the tunnel kiln. The temperature of the tunnel kiln is adjusted according to the temperature required for carbonization. The carbonized materials are naturally cooled with the kiln car and then taken out of the crucible to complete carbonization. This process consumes a lot of energy, and 60% of its heat energy is consumed in the kiln car and crucible. The processing cost is high. The materials in the crucible will also be partially oxidized when the temperature is increased, resulting in material loss, damage to the specific surface area of ​​the materials, and reduction in product quality. Due to the open kiln, the pollution controllability is also poor.

[0004] At present, the granulation and pre-carbonization processes are carried out separately, that is, after the material is granulated in the reactor, it is cooled to room temperature; then it enters the roller kiln or tunnel kiln to complete pre-carbonization and then cools down. This will obviously lead to excessive energy consumption, product inconsistency, cumbersome and discontinuous processes, which will inevitably cause high equipment costs, low efficiency, unstable product quality and excessive pollution to the production site environment.

[0005] Rotary kiln is widely used in other related high-temperature pyrolysis and calcination industries. It has the advantages of simple equipment, large production capacity and relatively low energy consumption. However, the heating method of traditional rotary kiln is that the fuel is sprayed into the kiln through the burner from the kiln head end for combustion, and the heat is transferred to the material by radiation, convection, conduction and other methods. This heating method cannot meet the quality and temperature control requirements of negative electrode materials. Therefore, it is very necessary to optimize and transform the production equipment to realize the process transformation of the equipment.

[0006] Based on this, the present invention designs an artificial graphite coating granulation pre-carbonization integrated machine to solve the above problems. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, the present invention provides an artificial graphite coating granulation pre-carbonization integrated machine.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: An artificial graphite coating granulation pre-carbonization integrated machine, comprising a cylinder, a kiln head cover rotatably mounted on the left end of the cylinder, a kiln tail smoke chamber rotatably mounted on the right end of the cylinder, and a transmission mechanism mounted on the left side of the outer end of the cylinder, wherein the outer end of the cylinder is provided with a granulation section heating mechanism and a carbonization section heating mechanism for heating the material therein from left to right in sequence, and the transmission mechanism is connected to the kiln head cover; The granulation section heating mechanism, the carbonization section heating mechanism, the kiln head cover and the kiln tail smoke chamber are all sealed and connected to the cylinder through a sealing component; The outer end of the cylinder is equipped with multiple groups of supporting devices.

[0009] Furthermore, there are three groups of support devices, which are respectively located between the kiln head cover and the granulation section heating mechanism, between the granulation section heating mechanism and the carbonization section heating mechanism, and between the carbonization section heating mechanism and the kiln tail smoke chamber.

[0010] Furthermore, the transmission mechanism includes a reduction motor, an outer cover, a double gear set and a large gear. The reduction motor and the outer cover are fixedly installed on the kiln head cover, the outer cover is fixedly connected to the kiln head cover, the outer cover is sleeved on the outer wall of the cylinder, the double gear set is rotatably installed on the inner wall of the outer cover, one gear of the double gear set is fixedly connected to the output end of the reduction motor, the other gear of the double gear set is meshed and connected to the large gear, the large gear is welded to the outer wall of the cylinder, and the reduction motor, the outer cover and the kiln head cover are fixedly installed on the support seat.

[0011] Furthermore, the granulation section heating mechanism includes a granulation section heating cover, a smoke exhaust port, a high-speed burner and a skid-mounted device. The smoke exhaust port is fixedly installed on the top of the granulation section heating cover, and the high-speed burner is fixedly installed on the bottom of the side wall of the granulation section heating cover. The high-speed burner is connected to the skid-mounted device through a pipeline, and the granulation section heating cover and the cylinder are sealed by a sealing assembly.

[0012] Furthermore, there are seven high-speed burners which are evenly spaced and distributed on the heating housing of the granulation section; The three high-speed burners on the left side form a temperature zone; The four high-speed burners located on the right side form another temperature zone.

[0013] Furthermore, the carbonization section heating mechanism includes a carbonization section heating cover and a regenerative burner, and the regenerative burner is fixedly installed on the bottom of the side wall of the carbonization section heating cover.

[0014] Furthermore, there are six regenerative burners, three of which are evenly spaced on the two side walls of the carbonization section heating cover, the six regenerative burners form a temperature zone, a smoke exhaust hole is provided at the upper end of the regenerative burner, and the carbonization section heating cover and the cylinder are sealed and connected by a sealing assembly.

[0015] Furthermore, the supporting device includes a wheel belt sleeved on the outer wall of the cylinder and a supporting wheel group coupled to the wheel belt.

[0016] Furthermore, it also includes a hydraulic wheel blocking device, which is arranged at the gap between the two tugboats of the supporting wheel assembly, and the wheel blocking arc surface of the hydraulic wheel blocking device is in contact and connected with the non-arc surface side of the wheel band.

[0017] Furthermore, the inner walls of the granulation section heating shell and the carbonization section heating shell are paved with a heat-resistant, heat-insulating layer.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, the material enters the cylinder from one end of the kiln head cover, and then enters the granulation section of the cylinder, and completes the coating granulation process under the heating of the granulation section heating mechanism, and then the material enters the carbonization section of the cylinder, that is, the pre-carbonization process is realized under the heating of the carbonization section heating mechanism, and finally the material leaves the cylinder from the kiln tail cover.

[0019] 2. In the granulation section of the cylinder, the three high-speed burners on the left control one heating temperature zone, and the four high-speed burners on the right control another heating temperature zone; 3. In the carbonization section of the cylinder, when three regenerative burners on one side are used for heating, three regenerative burners on the other side are used for smoke exhaust. Six regenerative burners on both sides operate intermittently to control a heating temperature zone. Different temperature zones meet different process conditions, and finally realize the integrated production of coating, granulation and pre-carbonization, and produce qualified negative electrode materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A three-dimensional view of an artificial graphite coating granulation pre-carbonization integrated machine of the present invention Figure 1 ; Figure 2 It is a front view of an artificial graphite coating granulation pre-carbonization integrated machine of the present invention; Figure 3A top view of an artificial graphite coating granulation pre-carbonization integrated machine of the present invention; Figure 4 A three-dimensional view of an artificial graphite coating granulation pre-carbonization integrated machine of the present invention Figure 2 ; Figure 5 For along Figure 3 AA direction cross-sectional view; Figure 6 for Figure 1 The enlarged view of point B in the middle; Figure 7 for Figure 2 Enlarged view of point C in the middle; Figure 8 It is a plan view of installing a screw conveyor and a cooling kiln according to the present invention.

[0022] The numbers in the figure represent: 1. Cylinder 2. Kiln head cover 3. Kiln tail smoke chamber 4. Transmission mechanism 401. Speed ​​reduction motor 402. Outer cover 403. Double gear set 404. Large gear 5. Granulation section heating mechanism 501. Granulation section heating cover 502. Smoke exhaust port 503. High-speed burner 504. Skid-mounted equipment 6. Carbonization section heating mechanism 601. Carbonization section heating cover 602. Regenerative burner 7. Sealing assembly 8. Support device 801. Wheel belt 802. Support wheel group 9. Hydraulic wheel blocking device 10. Screw conveyor 11. Cooling kiln. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0025] Embodiment 1: In some embodiments, please refer to the drawings of the specification Figure 1-Figure 8 , an artificial graphite coating granulation pre-carbonization integrated machine, comprising a cylinder 1, a kiln head cover 2 rotatably mounted on the left end of the cylinder 1, a kiln tail cover rotatably mounted on the right end of the cylinder 1, the kiln tail cover is connected to a kiln tail smoke chamber 3, a transmission mechanism 4 mounted on the left side of the outer end of the cylinder 1, and a granulation section heating mechanism 5 and a carbonization section heating mechanism 6 for heating the material therein are sequentially arranged on the outer end of the cylinder 1 from left to right; The granulation section heating mechanism 5, the carbonization section heating mechanism 6, the kiln head cover 2 and the kiln tail smoke chamber 3 are all sealed and connected to the cylinder 1 through the sealing component 7; A plurality of supporting devices 8 are installed at the outer end of the cylinder 1.

[0026] When the present invention is used, the material enters the cylinder 1 from one end of the kiln head cover 2, and then enters the granulation section of the cylinder 1, and completes the coating granulation process under the heating of the granulation section heating mechanism 5. Then the material enters the carbonization section of the cylinder 1, that is, the pre-carbonization process is realized under the heating of the carbonization section heating mechanism 6, and finally the material leaves the cylinder 1 from one end of the kiln tail smoke chamber 3.

[0027] Embodiment 2: In some embodiments, Figure 1-Figure 8 As shown, as a preferred embodiment of the present invention, there are three groups of supporting devices 8, and the three groups of supporting devices 8 are respectively located between the kiln head hood 2 and the granulation section heating mechanism 5, between the granulation section heating mechanism 5 and the carbonization section heating mechanism 6, and between the carbonization section heating mechanism 6 and the kiln tail smoke chamber 3.

[0028] The transmission mechanism 4 includes a reduction motor 401, an outer cover 402, a double gear set 403 and a large gear 404. The reduction motor 401 and the outer cover 402 are fixedly installed on the kiln head cover 2. The outer cover 402 is sleeved on the outer wall of the cylinder 1. The double gear set 403 is rotatably installed on the inner wall of the outer cover 402 and a gap is provided between the double gear set 403 and the inner wall of the outer cover 402. One gear of the double gear set 403 is fixedly connected to the output end of the reduction motor 401, and the other gear of the double gear set 403 is meshed and connected with the large gear 404. The large gear 404 is welded to the outer wall of the cylinder 1. The reduction motor 401, the outer cover 402 and the kiln head cover 2 are fixedly installed on the support seat.

[0029] The granulation section heating mechanism 5 includes a granulation section heating cover 501, a smoke exhaust port 502, a high-speed burner 503 and a skid-mounted device 504. The smoke exhaust port 502 is fixedly installed on the top of the granulation section heating cover 501, and the high-speed burner 503 is fixedly installed on the bottom of the side wall of the granulation section heating cover 501. The high-speed burner 503 is connected to the skid-mounted device 504 through a pipeline, and the granulation section heating cover 501 and the cylinder 1 are sealed by a sealing assembly 7.

[0030] The sealing component 7 is a fish scale type dynamic seal; There are seven high-speed burners 503 which are evenly spaced and distributed on the granulation section heating housing 501; The three high-speed burners 503 located on the left side form a temperature zone; The four high-speed burners 503 located on the right side form another temperature zone.

[0031] The carbonization section heating mechanism 6 comprises a carbonization section heating shell 601 and a regenerative burner 602 . The regenerative burner 602 is fixedly mounted on the bottom of the side wall of the carbonization section heating shell 601 .

[0032] There are six regenerative burners 602. Three regenerative burners 602 are evenly distributed on the two side walls of the carbonization section heating shell 601. The six regenerative burners 602 form a temperature zone. A smoke exhaust hole is opened at the upper end of the regenerative burner 602. The carbonization section heating shell 601 is sealed and connected to the cylinder 1 through a sealing component 7.

[0033] The supporting device 8 includes a wheel belt 801 sleeved on the outer wall of the cylinder 1 and a supporting wheel group 802 coupled to the wheel belt 801 .

[0034] It also includes a hydraulic wheel blocking device 9, which is arranged at the gap between the two tugboats of the supporting wheel group 802, and the wheel blocking arc surface of the hydraulic wheel blocking device 9 is in contact with the non-arc surface side of the wheel belt 801.

[0035] In the granulation section of the cylinder 1, the three high-speed burners 503 on the left side control one heating temperature zone, and the four high-speed burners 503 on the right side control another heating temperature zone; In the carbonization section of the cylinder 1, when three regenerative burners 602 on one side are used for heating, three regenerative burners 602 on the other side are used for smoke exhaust. The six regenerative burners 602 on both sides operate intermittently to control a heating temperature zone. Different temperature zones meet different process conditions, and finally realize the integrated production of coating, granulation and pre-carbonization, and produce qualified negative electrode materials.

[0036] Embodiment 3: In some embodiments, Figure 1-Figure 8 As shown, as a preferred embodiment of the present invention, the inner walls of the granulation section heating shell 501 and the carbonization section heating shell 601 are paved with a heat-resistant heat-insulating layer.

[0037] Thus, the heat preservation effect of the granulation section heating shell 501 and the carbonization section heating shell 601 is improved.

[0038] Embodiment 4: In some embodiments, Figure 1-Figure 8 As shown, as a preferred embodiment of the present invention, it also includes a screw conveyor 10 and a cooling kiln 11, the inlet end of the screw conveyor 10 is located at the lower end of the outlet of the kiln tail cover, and the outlet end of the screw conveyor 10 extends into the inlet of the cooling kiln 11.

[0039] The high-temperature material is transported to the cooling kiln 11 by the screw conveyor 10 for cooling.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An all-in-one machine for coating, granulating and pre-carbonizing artificial graphite, comprising a cylinder (1), a kiln head cover (2) rotatably mounted on the left end of the cylinder (1), a kiln tail cover rotatably mounted on the right end of the cylinder (1), the kiln tail cover being connected to a kiln tail smoke chamber (3), and a transmission mechanism (4) mounted on the left side of the outer end of the cylinder (1), characterized in that: The outer end of the cylinder (1) is provided with a granulation section heating mechanism (5) and a carbonization section heating mechanism (6) for heating the material therein, from left to right; The granulation section heating mechanism (5), the carbonization section heating mechanism (6), the kiln head cover (2) and the kiln tail smoke chamber (3) are all sealed and connected to the cylinder (1) via a sealing component (7); Multiple groups of supporting devices (8) are installed on the outer end of the cylinder (1).

2. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 1 is characterized in that: There are three groups of support devices (8), and the three groups of support devices (8) are respectively located between the kiln head cover (2) and the granulation section heating mechanism (5), between the granulation section heating mechanism (5) and the carbonization section heating mechanism (6), and between the carbonization section heating mechanism (6) and the kiln tail smoke chamber (3).

3. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 2 is characterized in that: The transmission mechanism (4) comprises a reduction motor (401), an outer cover (402), a double gear set (403) and a large gear (404); the reduction motor (401) and the outer cover (402) are fixedly mounted on the kiln head cover (2); the outer cover (402) is sleeved on the outer wall of the cylinder (1); the double gear set (403) is rotatably mounted on the inner wall of the outer cover (402); a gap is provided between the double gear set (403) and the inner wall of the outer cover (402); one gear of the double gear set (403) is fixedly connected to the output end of the reduction motor (401); the other gear of the double gear set (403) is meshedly connected to the large gear (404); the large gear (404) is welded to the outer wall of the cylinder (1); the reduction motor (401), the outer cover (402) and the kiln head cover (2) are fixedly mounted on a support base.

4. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 3 is characterized in that: The granulation section heating mechanism (5) comprises a granulation section heating cover (501), a smoke exhaust port (502), a high-speed burner (503) and a skid-mounted device (504); the smoke exhaust port (502) is fixedly mounted on the top of the granulation section heating cover (501); the high-speed burner (503) is fixedly mounted on the bottom of the side wall of the granulation section heating cover (501); the high-speed burner (503) is connected to the skid-mounted device (504) via a pipeline; and the granulation section heating cover (501) and the cylinder (1) are sealed via a sealing assembly (7).

5. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 4 is characterized in that: There are seven high-speed burners (503) which are evenly spaced and distributed on the granulation section heating housing (501); The three high-speed burners (503) located on the left side form a temperature zone; Four high-speed burners (503) located on the right side form another temperature zone.

6. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 5, characterized in that: The carbonization section heating mechanism (6) comprises a carbonization section heating cover (601) and a regenerative burner (602), wherein the regenerative burner (602) is fixedly mounted on the bottom of the side wall of the carbonization section heating cover (601).

7. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 6 is characterized in that: There are six regenerative burners (602), three regenerative burners (602) are evenly spaced on the two side walls of the carbonization section heating cover (601), the six regenerative burners (602) form a temperature zone, a smoke exhaust hole is provided at the upper end of the regenerative burner (602), and the carbonization section heating cover (601) and the cylinder (1) are sealed and connected via a sealing assembly (7).

8. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 7, characterized in that: The supporting device (8) comprises a wheel belt (801) sleeved on the outer wall of the cylinder (1) and a supporting wheel assembly (802) coupled to the wheel belt (801).

9. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 8, characterized in that: It also includes a hydraulic wheel blocking device (9), which is arranged at the gap between two tugboats of the supporting wheel assembly (802), and the wheel blocking arc surface of the hydraulic wheel blocking device (9) is in contact and connected with the non-arc surface side of the wheel band (801).

10. The artificial graphite coating granulation pre-carbonization integrated machine according to claim 9, characterized in that: The inner walls of the granulation section heating housing (501) and the carbonization section heating housing (601) are paved with a heat-resistant, heat-insulating layer.

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