Rotary sintering furnace

Abstract

A rotary sintering furnace, comprising a furnace body assembly and a knocking device, wherein the furnace body assembly comprises a heating section, a thermally insulating section and a cooling section; the furnace body assembly comprises a converter, a first heating device used for heating the converter in the heating section, a second heating device used for heating the converter in the thermally insulating section, a cooling device used for cooling the converter in the cooling section, and a driving device used for driving the converter to rotate; and the knocking device is configured to knock the converter and comprises a first knocking device arranged between the heating section and the thermally insulating section and / or a second knocking device arranged between the thermally insulating section and the cooling section.

Description

Rotary sintering furnace

[0001] Cross-reference to related applications

[0002] The present application is based on Chinese Patent Application No. 202410423459.6, filed on April 9, 2024, and Chinese Patent Application No. 202420728611.7, filed on April 9, 2024, and claims priority to the aforementioned Chinese Patent Applications, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the field of rotary sintering furnaces, in particular to a rotary sintering furnace. BACKGROUND

[0004] A rotary sintering furnace is a thermal equipment for calcining, roasting or drying granular and powdery materials, which has the advantages of a combustion system, strong technical power, precise gas distribution, and low burning loss, and can be used for drying, dehydration and roasting materials in the chemical industry, such as the production of lithium iron phosphate in the new energy field. The rotary sintering furnace used for the production of lithium iron phosphate is a continuous production device that can be electrically heated. Before normal operation, the furnace is first heated. When the temperature of the rotary furnace reaches the process requirement, the material to be roasted is sent into the rotary furnace from the guide pipe of the feed box at the furnace head. The material is indirectly heated in the rotary furnace to achieve the purpose of roasting. The rotary furnace has helical blades that rotate slowly synchronously with the rotary furnace. The material is roasted while moving towards the furnace tail through the helical blades in the rotary furnace, and finally sent to the next device from the discharge box at the furnace tail. When the rotary sintering furnace is used to manufacture lithium iron phosphate, it is found that the content of the adhesive skin material and impurities in the lithium iron phosphate positive material is too high.

[0005] SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a rotary sintering furnace, which is beneficial to reduce the adhesive skin material in the discharge and reduce the content of impurities in the discharge.

[0007] The rotary sintering furnace according to the embodiments of the present application comprises a furnace body assembly and a knocking device. The furnace body assembly comprises a heating-up section, a heat preservation section and a cooling section. The furnace body assembly comprises a rotary furnace, a first heating device for heating the rotary furnace in the heating-up section, a second heating device for heating the rotary furnace in the heat preservation section, a cooling device for cooling the rotary furnace in the cooling section, and a driving device for driving the rotary furnace to rotate. The knocking device is used to knock the rotary furnace and comprises a first knocking device arranged between the heating-up section and the heat preservation section, and / or a second knocking device arranged between the heat preservation section and the cooling section.

[0008] According to the rotary sintering furnace, the adhered material in the rotary kiln can be knocked off in time by the knocking device, the temperature uniformity of the inner wall of the rotary kiln is improved, the possibility of reaction between the material and the wall material of the rotary kiln is reduced, the problem of carrying impurities or overburning material in the product is improved, and the product quality is improved. Moreover, the knocking can be performed in time during the sintering process according to the need, at this time, the adhered material is relatively small, easy to knock off, and has small cleaning difficulty, improved cleaning effect, and because the knocking device can knock off the adhered material in time, the overburning skin can be reduced. After the adhered material is knocked down, it will be mixed into the material in the rotary kiln, and after discharging, it will be sieved synchronously, and the material meeting the particle size requirement will be used as the product normally, so that the waste is reduced, and the production cost is reduced. When the rotary sintering furnace is used to manufacture lithium iron phosphate, the adhered skin material in the lithium iron phosphate positive material can be reduced, the impurity content is reduced, and the product quality is improved. In addition, the knocking device is arranged, manual cleaning is not needed, and the manual cleaning cost is reduced. Moreover, the first knocking device and the second knocking device can knock near the position where the material is easy to adhere and overburn, the knocking effect of the material is good, the first knocking device does not affect the installation and work of the first heating device and the second heating device, the setting position of the first knocking device is not easy to be affected by high temperature, and the first knocking device is easy to install and maintain, the second knocking device does not affect the installation and work of the second heating device and the cooling device, the setting position of the second knocking device is not easy to be affected by high temperature, and the second knocking device is easy to install and maintain.

[0009] In some embodiments, the furnace body assembly is provided with a first heat preservation shell at the heating section and a second heat preservation shell at the heat preservation section, and the first heat preservation shell and the second heat preservation shell are spaced apart; wherein the first knocking device is arranged at the space between the first heat preservation shell and the second heat preservation shell; and / or the second knocking device is arranged on the side of the second heat preservation shell away from the first heat preservation shell.

[0010] In some embodiments, the first heating device is arranged outside the rotary kiln and fixed in the first heat preservation shell, the second heating device is arranged outside the rotary kiln and fixed in the second heat preservation shell, and the first heating device and the second heating device each include a heating unit, and the heating unit includes a plurality of electric heaters arranged side by side along the length direction of the rotary kiln.

[0011] In some embodiments, the top and bottom of the rotary kiln are respectively provided with the heating unit.

[0012] In some embodiments, the cooling device includes an outer shell and a spraying device, the spraying device is arranged outside the rotary kiln, and the outer shell covers the spraying device.

[0013] In some embodiments, the knocking device is arranged outside the furnace body assembly; and / or, the knocking device further comprises a third knocking device arranged at a side of the temperature rising section away from the temperature maintaining section; and / or, the knocking device further comprises a plurality of fourth knocking devices arranged at the temperature rising section and / or the temperature maintaining section.

[0014] In some embodiments, the rotary sintering furnace further comprises a support and a gas source device, the knocking device comprises a retractable knocking head; the support is arranged outside the rotary furnace, the rotary furnace rotates relative to the support, the knocking device is arranged on the support, and the gas source device is arranged on the support and connected with the knocking device to drive the knocking head to retract and knock the rotary furnace.

[0015] In some embodiments, the rotary furnace is arranged horizontally along an axis, the knocking device is arranged above a horizontal center plane of the rotary furnace, and an included angle a1 between a retracting direction of the knocking head and the horizontal center plane of the rotary furnace is 10°-80°.

[0016] In some embodiments, the rotary furnace is arranged horizontally along an axis, the knocking device is arranged above a horizontal center plane of the rotary furnace, and an included angle a1 between a retracting direction of the knocking head and the horizontal center plane of the rotary furnace is 10°-80°.

[0017] In some embodiments, the support comprises vertical supports arranged on both sides of the rotary furnace, a horizontal support connected to upper ends of the vertical supports, and inclined supports connected between the vertical supports and the horizontal support, the gas source device is arranged on the vertical supports, and the knocking device is arranged on the inclined supports.

[0018] In some embodiments, a first pad is arranged circumferentially on the rotary furnace, and the knocking head acts on the first pad to knock the rotary furnace; and / or, a gas source pressure of the gas source device is 0.35Mpa-0.7Mpa, and a knocking frequency of the knocking device is 1 / 5s-5min.

[0019] In some embodiments, the knocking device comprises a plurality of knocking units arranged at intervals along a circumference of the rotary furnace, each of the knocking units comprises a pipe and a knocking member, one end of the pipe is fixed to the rotary furnace, the other end of the pipe extends away from a central axis of the rotary furnace, the knocking member is arranged in the pipe and is slidable relative to the pipe and used to knock the rotary furnace.

[0020] In some embodiments, a second pad is provided inside the pipe member and / or on the outer wall of the converter, and the knocking member acts on the second pad to knock the converter; and / or an elastic float is provided inside the end of the pipe member close to the converter, and the elastic float includes a float and a spring, and the spring is used to push the float to move in a direction away from the converter, the area of ​​the float is larger than the area of ​​the knocking member, and the knocking member knocks the converter through the float.

[0021] In some embodiments, the driving device is arranged between the insulation section and the cooling section, and includes a driving motor, a reducer and a transmission gear. The converter is surrounded by a ring gear, and the transmission gear is engaged with the ring gear. The driving motor drives the transmission gear to rotate through the reducer; and / or, the rotation speed of the converter is 8-15 minutes / revolution.

[0022] In some embodiments, the rotary sintering furnace is a lithium iron phosphate rotary sintering furnace, and the rotary furnace includes a furnace body and spiral blades, and the spiral blades are arranged on the inner wall of the furnace body for synchronous rotation, and the furnace body and the spiral blades are both made of stainless steel or alloy; and / or, the surface polishing degree of the inner wall of the furnace body and the spiral blades is less than 3μm.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of a rotary sintering furnace according to one embodiment of the present application;

[0025] FIG2 is a top view of a rotary sintering furnace according to one embodiment of the present application;

[0026] FIG3 is a schematic diagram of a furnace assembly according to one embodiment of the present application;

[0027] FIG4 is a front view of the rotary sintering furnace shown in FIG2 ;

[0028] FIG5 is a schematic diagram of a pneumatic hammer striker according to one embodiment of the present application;

[0029] FIG6 is a schematic diagram of a rotary sintering furnace according to one embodiment of the present application;

[0030] FIG7 is a schematic diagram of a rotary sintering furnace according to another embodiment of the present application;

[0031] FIG8 is a schematic diagram of a rotary sintering furnace according to another embodiment of the present application;

[0032] FIG9 is a schematic diagram of the cooperation between the converter and the fourth knocking device according to one embodiment of the present application.

[0033] Reference: rotary sintering furnace 1000; furnace body assembly 100; heating-up section 101; holding section 102; cooling section 103; rotary kiln 1; furnace body 1a; helical blade 1b; first furnace section 11; second furnace section 12; third furnace section 13; first zone 14; second zone 15; central horizontal plane S1; central vertical plane S2; first pad 16; second pad 17; heating device 2; first heating device 21; second heating device 22; heating unit 20; electric heater 201; cooling device 3; outer shell 31; spraying device 32; driving device 4; driving motor 41; speed reducer 42; transmission gear 43; gear ring 44; holding outer shell 5; first holding outer shell 51; second holding outer shell 52; knocking device 200; first knocking device 61; second knocking device 62; third knocking device 63; fourth knocking device 64; air hammer knocker 7; knocking head 70; metal base plate 71; permanent magnet 72; magnetic piston 73; return spring 74; knocking unit 8; pipe piece 81; knocking piece 82; elastic float 83; float 831; spring 832; bracket 300; vertical bracket 301; horizontal bracket 302; inclined bracket 303; air source device 400; air source pressure control system 91; electromagnetic valve 92; air source pipe 93; time relay 94. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein like or similar elements are denoted by the same or similar reference symbols throughout the drawings. The embodiments described below are examples for explaining the present application and are not intended to be limiting of the present application.

[0035] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For purposes of explanation and non- limitation, specific details of certain examples are described. Of course, many modifications can be made to the embodiments described herein, which are intended to be within the scope of the present application. In addition, the present application can be implemented in different examples without departing from the scope of the present application. Further, the present application can repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or configurations discussed below. In addition, the present application provides various examples of specific processes and materials. However, one of ordinary skill in the art can recognize that other processes can be applicable and / or other materials can be used without departing from the scope of the present application.

[0036] The rotary sintering furnace is a thermal equipment for calcining, roasting or drying granular and powdery materials, which has the advantages of strong technical power, precise gas distribution and low burning loss, and can be used for drying, dehydration and roasting materials in the chemical industry, such as the production of lithium iron phosphate in the new energy field. The rotary sintering furnace for lithium iron phosphate production is a continuous production device that can be electrically heated. Before normal operation, the furnace is first baked. When the temperature of the rotary furnace reaches the process requirement, the material to be roasted is sent into the rotary furnace from the guide pipe of the feed box at the furnace head. The material is indirectly heated by the rotary furnace to achieve the purpose of roasting. The rotary furnace has helical blades that rotate slowly synchronously with the rotary furnace. The material is roasted while moving towards the furnace tail through the helical blades, and finally sent to the next device by the discharge box at the furnace tail.

[0037] However, when the rotary sintering furnace is used to manufacture lithium iron phosphate, it is found that the adhesive skin material in the lithium iron phosphate positive material has too high impurity content and poor quality. Through research, the present application creatively finds that during the sintering process of lithium iron phosphate material in the rotary sintering furnace, due to the characteristics of lithium iron phosphate material itself, the material is easy to adhere to the inner wall of the rotary furnace or the helical blades inside the rotary furnace, affecting the temperature uniformity of the inner wall of the rotary furnace, causing local temperature to be too high, i.e. due to the adhesion of the material, the local sintering temperature of the rotary furnace is too high, which makes the material easy to react with the furnace wall material, thereby causing the product to carry impurities or have over-fired material, affecting the product quality. Moreover, when the wall-adhesion material is sintered for a long time at high temperature, it is easy to form an over-sintered skin, i.e. after the material adheres to the inner wall of the rotary furnace, the sheet-shaped solid formed by sintering or over-sintering has a size larger than the required particle size of the material, which affects the electrical properties such as charge and discharge cycle of the product, and the recovered product cannot be used normally, causing waste and increasing production cost. At present, the inner wall of the rotary furnace is usually cleaned manually, but the operator cannot easily enter the interior of the rotary furnace for cleaning, the cleaning is too troublesome and dangerous, and the cleaning needs to be performed after sintering, at which time the amount and thickness of the adhered material are large, the cleaning difficulty is great, and the cleaning effect is poor.

[0038] To this end, the application provides a rotary sintering furnace 1000, which comprises a rotary furnace 1 and a knocking device 200 for knocking the rotary furnace 1. The sticking material in the rotary furnace 1 can be knocked off in time by the knocking device 200, the temperature uniformity of the inner wall of the rotary furnace 1 is improved, the possibility of reaction between the material and the furnace wall material is reduced, the problem of carrying impurities or overburning material in the product is improved, and the product quality is improved. Moreover, knocking can be performed in time during the sintering process as needed, at this time, the sticking material is relatively less, easy to knock off, the cleaning difficulty is smaller, the cleaning effect is improved, and because the knocking device 200 can knock off the sticking material in time, the overburning skin can be reduced. After the sticking material is knocked down, it will be mixed into the material in the rotary furnace 1, and after discharging, it will be sieved synchronously. The product that meets the particle size requirement will be used normally, thereby reducing waste and production cost. In addition, by setting the knocking device 200, manual cleaning is not required, and the cost of manual cleaning is reduced. When the rotary sintering furnace 1000 of the embodiment of the application is used to manufacture lithium iron phosphate, the sticking skin material in the lithium iron phosphate positive material can be reduced, the impurity content is reduced, and the product quality is improved.

[0039] In some embodiments of the application, as shown in FIGS. 1-3, the rotary sintering furnace 1000 comprises a furnace body assembly 100 and a knocking device 200. The furnace body assembly 100 comprises a heating-up section 101, a holding section 102 and a cooling section 103. The furnace body assembly 100 comprises a rotary furnace 1, a first heating device 21 for heating the rotary furnace 1 in the heating-up section 101, a second heating device 22 for heating the rotary furnace 1 in the holding section 102, a cooling device 3 for cooling the rotary furnace 1 in the cooling section 103, and a driving device 4 for driving the rotary furnace 1 to rotate. The knocking device 200 is used for knocking the rotary furnace 1, and comprises a first knocking device 61 arranged between the heating-up section 101 and the holding section 102, and / or a second knocking device 62 arranged between the holding section 102 and the cooling section 103.

[0040] Exemplarily, in combination with FIGS. 2 and 3, the furnace body assembly 100 comprises a rotary furnace 1, a heating device 2, a cooling device 3 and a driving device 4. The rotary furnace 1 comprises a first furnace section 11, a second furnace section 12 and a third furnace section 13 arranged in sequence. The heating device 2 comprises a first heating device 21 arranged outside the first furnace section 11, and a second heating device 22 arranged outside the second furnace section 12. The cooling device 3 is arranged outside the third furnace section 13. The driving device 4 is connected with the rotary furnace 1 for driving the rotary furnace 1 to rotate.

[0041] Exemplarily, the rotary furnace 1 is an integral cylindrical structure (but not required to be an integral cylinder, for example, can be composed of multiple cylinder segments rigidly connected), the rotary furnace 1 includes the first furnace segment 11, the second furnace segment 12 and the third furnace segment 13 as an entirety, driven by a driving device 4, and synchronously rotates under the driving action of the driving device 4. Exemplarily, in combination with FIG. 9, the rotary furnace 1 has a spiral blade 1b, which synchronously rotates with the rotary furnace 1, so as to push the material in the rotary furnace 1 to move along the direction from the first furnace segment 11 to the second furnace segment 12 to the third furnace segment 13 through the rotation of the spiral blade 1b when the rotary furnace 1 rotates.

[0042] Exemplarily, the first furnace segment 11 can be connected with a feeding box, and the third furnace segment 13 can be connected with a discharging box. The material enters the first furnace segment 11 from the feeding box, and with the rotation of the rotary furnace 1, the spiral blade 1b in the rotary furnace 1 carries the material from the first furnace segment 11 into the second furnace segment 12, and then from the second furnace segment 12 into the third furnace segment 13, and finally discharged to the discharging box. Among them, when the material enters the first furnace segment 11, it can be heated in stages, for example, gradually heated from room temperature to 700-800°C, and then heated at a constant temperature in the second furnace segment 12, for example, heated at a constant temperature between 700-800°C, and then cooled in the third furnace segment 13, and finally discharged from the discharging box.

[0043] Exemplarily, as shown in FIG. 1, the knocking device 200 is externally arranged on the furnace body assembly 100, that is, any one of the knocking device 200 (such as any one of the first knocking device 61, the second knocking device 62 and the third knocking device 63) is arranged outside all components contained in the furnace body assembly 100, so that the knocking device 200 is arranged outside the rotary furnace 1 for knocking the rotary furnace 1. Therefore, by arranging the knocking device 200 outside the rotary furnace 1, the knocking device 200 will not be directly in contact with the material in the rotary furnace 1, so as to avoid the interference of the knocking device 200 on the transportation and heating of the material, so that the roasting of the material in the rotary furnace 1 can be smoothly carried out, and the temperature in the rotary furnace 1 will not affect the working of the knocking device 200, so as to improve the working stability of the knocking device 200.

[0044] In the embodiments of the present application, the knocking device 200 can include at least one of the first knocking device 61 and the second knocking device 62, that is, the knocking device 200 can include only the first knocking device 61, the knocking device 200 can also include only the second knocking device 62, and the knocking device 200 can also include both the first knocking device 61 and the second knocking device 62. In combination with FIGS. 2-3, the first knocking device 61 is arranged corresponding to the connection between the first furnace section 11 and the second furnace section 12 (the first region 14), so that the first knocking device 61 can knock the position of the rotary furnace 1 between the first furnace section 11 and the second furnace section 12, and the second knocking device 62 is arranged corresponding to the connection between the second furnace section 12 and the third furnace section 13 (the second region 15), so that the second knocking device 62 can knock the position of the rotary furnace 1 between the second furnace section 12 and the third furnace section 13.

[0045] As stated above, during the lithium iron phosphate material sintering process of the rotary sintering furnace 1000, due to the characteristics of the lithium iron phosphate material itself, the material is easy to stick to the inner wall of the rotary furnace 1 or the spiral blade 1b in the rotary furnace 1. Since the temperature of the first furnace section 11 gradually increases from the feeding box to the second furnace section 12, and the temperature of the second furnace section 12 is constant and high, the material is more likely to be over-sintered or react with the furnace wall material of the rotary furnace at the position close to the second furnace section 12 of the first furnace section 11 and in the second furnace section 12 after sticking to the furnace wall and the spiral blade 1b due to the local sintering temperature being too high, thereby causing material loss or impurities in the product.

[0046] When the first knocking device 61 is arranged to knock the position of the rotary furnace 1 between the first furnace section 11 and the second furnace section 12, it is beneficial to knock off the material sticking in the first furnace section 11 and the second furnace section 12, and when the second knocking device 62 is arranged to knock the position of the rotary furnace 1 between the second furnace section 12 and the third furnace section 13, it is beneficial to knock off the material sticking in the second furnace section 12. Therefore, by arranging at least one of the first knocking device 61 and the second knocking device 62, it is beneficial to knock the vicinity of the rotary furnace 1 where the material is easy to stick and over-sinter, and the sticking material can be knocked off more effectively.

[0047] Further, since the first knocking device 61 is arranged between the heating section 101 and the holding section 102, the first knocking device 61 is arranged corresponding to the connection between the first furnace section 11 and the second furnace section 12 (the first area 14), so that the arrangement position of the first knocking device 61 can avoid the first heating device 21 and the second heating device 22, i.e. the first knocking device 61 can be arranged between the first heating device 21 and the second heating device 22, thereby facilitating the installation of the first knocking device 61. Since the second knocking device 62 is arranged between the holding section 102 and the cooling section 103, the second knocking device 62 is arranged corresponding to the connection between the second furnace section 12 and the third furnace section 13 (the second area 15), so that the arrangement position of the second knocking device 62 can avoid the second heating device 22 and the cooling device 3, i.e. the second knocking device 62 can be arranged between the second heating device 22 and the cooling device 3, thereby facilitating the installation of the second knocking device 62.

[0048] In short, according to the rotary sintering furnace 1000 of the embodiments of the present application, the first knocking device 61 and the second knocking device 62 can knock near the position where the material of the rotary furnace 1 is prone to stick, and the knocking effect is good, and further, the first knocking device 61 does not affect the installation and work of the first heating device 21 and the second heating device 22, the arrangement position of the first knocking device 61 is not easily affected by high temperature, and the first knocking device 61 is easy to install and maintain, the second knocking device 62 does not affect the installation and work of the second heating device 22 and the cooling device 3, the arrangement position of the second knocking device 62 is not easily affected by high temperature, and the second knocking device 62 is easy to install and maintain.

[0049] In some embodiments of the present application, the furnace body assembly 100 is provided with a first holding shell 51 at the heating section 101 and a second holding shell 52 at the holding section 102, and the first holding shell 51 and the second holding shell 52 are arranged in a spaced manner.

[0050] For example, in combination with FIGS. 3-4, the furnace body assembly 100 further comprises a holding shell 5, when the knocking device 200 is arranged outside the furnace body assembly 100, the knocking device 200 is arranged outside the holding shell 5, wherein the holding shell 5 comprises a first holding shell 51 covering the first heating device 21 and the first furnace section 11, and a second holding shell 52 covering the second heating device 22 and the second furnace section 12. Thus, by arranging the holding shell 5, heat loss can be reduced, so that heat can be fully used for heating the rotary furnace 1, heat utilization rate is improved, and sintering cost is reduced.

[0051] In combination with Figs. 3-4, in some embodiments of the present application, when the knocking device 200 comprises the first knocking device 61, the first knocking device 61 can be arranged at a position spaced from the first heat-insulating shell 51 and the second heat-insulating shell 52. In this way, the first knocking device 61 is arranged at a position not easily affected by high temperature in the first heat-insulating shell 51 and the second heat-insulating shell 52, and is arranged outside the heat-insulating shell 5, thus being easy to install and maintain.

[0052] In combination with Figs. 3-4, in some embodiments of the present application, when the knocking device 200 comprises the second knocking device 62, the second knocking device 62 can be arranged at a position away from the first heat-insulating shell 51 on the second heat-insulating shell 52. In this way, the second knocking device 62 is arranged at a position not easily affected by high temperature in the second heat-insulating shell 52, and is arranged outside the heat-insulating shell 5, thus being easy to install and maintain.

[0053] It is worth mentioning that the heat-insulating shell 5 is not limited in structure, for example, the heat-insulating shell 5 can comprise a metal shell and a heat-insulating layer arranged on the inner wall of the metal shell, such as heat-insulating bricks, heat-insulating cotton, etc., so as to more effectively lock heat in the heat-insulating shell 5 and reduce heat waste.

[0054] In some embodiments of the present application, the heating device 2 is fixed to the heat-insulating shell 5, the first heating device 21 is arranged outside the converter 1 and fixed in the first heat-insulating shell 51, and the second heating device 22 is arranged outside the converter 1 and fixed in the second heat-insulating shell 52. That is, the first heat-insulating shell 51 covers the first furnace section 11 of the converter 1, the first heating device 21 is located outside the first furnace section 11 and inside the first heat-insulating shell 51, and the first heating device 21 is fixedly connected with the first heat-insulating shell 51, the second heat-insulating shell 52 covers the second furnace section 12 of the converter 1, the second heating device 22 is located outside the second furnace section 12 and inside the second heat-insulating shell 52, and the second heating device 22 is fixedly connected with the second heat-insulating shell 52.

[0055] Specifically, the heating device 2 and the heat-insulating shell 5 can both be fixed, and the converter 1 rotates relative to the heat-insulating shell 5 and the heating device 2, so that the heating device 2 can heat different circumferential positions of the converter 1 as the converter 1 rotates, improving the temperature uniformity of the converter 1, and by fixing the heating device 2 to the heat-insulating shell 5, the assembly process can be simplified, facilitating installation of the heating device 2.

[0056] Exemplarily, the converter 1 can be horizontally arranged, i.e., the axis of the converter 1 is horizontal, the heat preservation shell 5 can include an upper cover and a lower cover, the lower cover is internally provided with the heating device 2, the upper cover is also internally provided with the heating device 2, the lower cover provided with the heating device 2 is first installed in place, then the converter 1 is hoisted above the lower cover, and then the upper cover provided with the heating device 2 is hoisted in place, the two side walls of the upper cover and the two side walls of the lower cover are respectively locked and fixed by bolts, in this way, the overall equipment installation can be facilitated, and the heating device 2 can be maintained and replaced during use.

[0057] In some embodiments of the present application, in combination with FIG. 3, the first heating device 21 and the second heating device 22 each include a heating unit 20, the heating unit 20 includes a plurality of electric heaters 201 arranged side by side along the length direction of the converter 1. In this way, the first furnace section 11 and the second furnace section 12 can be heated along the entire length direction, and the heating effect can be improved. Moreover, in some examples, the plurality of electric heaters 201 in the heating unit 20 can be controlled separately, so that corresponding to the first furnace section 11, the temperature can be raised in steps, which is beneficial to sintering. More specifically, the first heat preservation shell 51 can be divided into a plurality of temperature zones arranged at intervals along the length direction of the converter 1 by a heat preservation material, at least one electric heater 201 can be arranged in each temperature zone, and each electric heater 201 can be independently controlled by a PLC, so that the heating temperature of each temperature zone can be different to realize gradient temperature rise, for example, the temperature of the first furnace section 11 rises in steps along the material feeding direction, and the second furnace section 12 can be sintered at a constant temperature.

[0058] In some embodiments of the present application, in combination with FIG. 3, the top and the bottom of the converter 1 are respectively provided with a heating unit 20. Exemplarily, the top and the bottom of the first furnace section 11 are respectively provided with a heating unit 20, and the top and the bottom of the second furnace section 12 are respectively provided with a heating unit 20. In this way, by respectively arranging the heating unit 20 at the top and the bottom of the converter 1, the heating efficiency of the converter 1 can be improved.

[0059] In some embodiments of the present application, in combination with FIG. 3, the cooling device 3 includes an outer cover 31 and a spraying device 32, the spraying device 32 is externally arranged on the converter 1, and the outer cover 31 covers the spraying device 32. Exemplarily, the outer cover 31 covers the third furnace section 13, the spraying device 32 is arranged in the outer cover 31, and the knocking device 200 is arranged outside the outer cover 31. For example, the spraying device 32 can spray the converter 1 to cool and lower the temperature of the converter 1, and the outer cover 31 can recover the sprayed cooling liquid to achieve the purpose of recycling and reuse.

[0060] Therefore, by arranging the knocking device 200 outside the outer shell 31, the knocking effect can be improved, and the knocking device 200 is arranged outside the outer shell 31 of the cooling device 3, so that the installation and maintenance of the knocking device 200 are facilitated.

[0061] In some embodiments of the present application, in combination with FIGS. 2 and 4, the knocking device 200 further comprises a third knocking device 63 arranged at a side of the temperature rising section 101 away from the temperature maintaining section 102, that is, the knocking device 200 further comprises a third knocking device 63 arranged at the feeding end of the first furnace section 11. That is, the third knocking device 63 can knock the feeding position of the first furnace section 11, so that the problem of the material sticking to the furnace wall due to the water vapor existing in the material with low temperature and the coal tar and other substances decomposed from the raw material in the initial sintering process can be improved by the third knocking device 63, thereby further reducing the sticking problem and improving the material flow rate. It can be understood that when the rotary sintering furnace 1000 comprises the first temperature maintaining shell 51, the third knocking device 63 can be arranged outside the first temperature maintaining shell 51, thereby facilitating the installation and maintenance of the third knocking device 63.

[0062] In some embodiments of the present application, in combination with FIGS. 2 and 9, the knocking device 200 further comprises a plurality of fourth knocking devices 64 arranged at the temperature rising section 101 and / or the temperature maintaining section 102. That is, the fourth knocking device 64 is arranged at at least one of the temperature rising section 101 and the temperature maintaining section 102. The relative position relationship between the fourth knocking device 64 and the temperature maintaining shell 5 and the rotary furnace 1 is not limited, for example, the fourth knocking device 64 can be arranged outside the rotary furnace 1 or inside the rotary furnace 1. When the fourth knocking device 64 is arranged at the temperature rising section 101, the overburned material sticking in the rotary furnace 1 at the temperature rising section 101 can be knocked, so as to facilitate the reduction of the sticking skin material in the discharge and the reduction of the impurity content in the discharge. When the fourth knocking device 64 is arranged at the temperature maintaining section 102, the overburned material sticking in the rotary furnace 1 at the temperature maintaining section 102 can be knocked, so as to facilitate the reduction of the sticking skin material in the discharge and the reduction of the impurity content in the discharge.

[0063] In some embodiments of the present application, in combination with FIG. 1 and FIG. 3, the rotary sintering furnace 1000 further comprises a support 300 and a gas source device 400, the knocking device 200 comprises a retractable knocking head 70; the support 300 is arranged outside the rotary furnace 1, the rotary furnace 1 rotates relative to the support 300, the knocking device 200 is arranged on the support 300 and used for knocking the rotary furnace 1, the gas source device 400 is arranged on the support 300 and connected with the knocking device 200, and the knocking head 70 is driven to retract and extend to knock the rotary furnace 1. Exemplarily, any one of the above-mentioned first knocking device 61, the second knocking device 62 and the third knocking device 63 can be configured in the above-mentioned form of being mounted on the support 300 and connected with the gas source device 400.

[0064] Therefore, by mounting the knocking device 200 and the gas source device 400 on the support 300, neither the knocking device 200 nor the gas source device 400 rotates with the rotary furnace 1, when the rotary furnace 1 rotates relative to the support 300, the knocking device 200 can knock different positions around the rotary furnace 1 with the rotation of the rotary furnace 1, which improves the probability of knocking the materials off, and by mounting the knocking device 200 and the gas source device 400 on the support 300 and not rotating with the rotary furnace 1, it can avoid the gas source pipe 93 or the electric wire from being wound, thereby improving the working reliability of the knocking device 200. In addition, since the support 300 and the rotary furnace 1 are independent of each other, the knocking device 200 is convenient to install and can be disassembled or replaced at any time according to the actual situation.

[0065] In some embodiments of the present application, as shown in FIG. 1 and FIG. 3, the axis of the rotary furnace 1 is arranged horizontally, the knocking device 200 is arranged higher than the central horizontal plane S1 of the rotary furnace 1 (i.e. the horizontal plane passing through the central axis of the rotary furnace 1), and the included angle a1 between the retracting and extending direction of the knocking head 70 of the knocking device 200 and the central horizontal plane S1 of the rotary furnace 1 is 10°-80°, for example, the included angle a1 can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, etc. Based on the rotary sintering furnace, the rotary furnace 1 itself rotates around the axis, and the internal spiral blade 1b is used to push the materials to move; when the rotary furnace 1 rotates, the materials adhered to the wall of the rotary furnace 1 will move to the top with the rotary furnace 1. Therefore, by the above-mentioned arrangement, by knocking from the oblique upper side of the rotary furnace 1 by the knocking device 200, the materials adhered to the wall of the rotary furnace 1 are more likely to fall off after being knocked, thereby being conducive to improving the cleaning effect.

[0066] In some embodiments of the present application, as shown in FIG. 1 and FIG. 3, the center vertical plane S2 (i.e. the vertical plane passing through the center axis of the rotary furnace 1) of the rotary furnace 1 is provided with one knocking device 200 on each side, and the two knocking devices 200 are symmetrically arranged about the center vertical plane S2, and the included angle a2 between the extension directions of the two knocking devices 200 is 30°-120°, for example, the included angle a2 can be 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, etc. Thus, symmetrical knocking from both sides, more knocking points, it is easier to make the adhered material fall off, further improve the cleaning effect. In addition, according to the actual needs, such as according to the sinter discharge condition and the post-process screen material condition, the two knocking devices 200 can be selected to knock at the same time, or the two knocking devices 200 can be selected to knock alternately, or only one knocking device 200 can be selected to knock, thereby having good flexibility.

[0067] In order to realize the installation of the two knocking devices 200, as shown in FIG. 1, the support 300 can be arranged as a door type, including vertical supports 301 located on both sides of the rotary furnace 1, a horizontal support 302 connected between the upper ends of the two vertical supports 301, and inclined supports 303 connected between the vertical supports 301 and the horizontal support 302, one knocking device 200 is fixed on each inclined support 303, and a gas source device 400 is installed on each vertical support 301, and each knocking device 200 is connected to the adjacent gas source device 400. Thus, the support 300 has good structural strength, which is beneficial to improve the working stability and reliability of the knocking device 200, and meets the installation requirements of the two knocking devices 200 and the two gas source devices 400.

[0068] In short, in order to ensure safe and stable operation, the knocking device 200 is fixed by using a door type support 300 outside the rotary furnace 1 of the rotary sintering furnace 1000, and the support 300 is fixed to the ground by bolts. The two symmetrically arranged knocking devices 200 can be selected to work simultaneously, alternately or individually according to process requirements. The support 300 and the rotary furnace 1 are independent of each other, easy to install, and the knocking device 200 can be disassembled or replaced at any time according to the situation.

[0069] It is worth noting that the number of knocking devices 200 is not limited to two, for example, only one can be provided, for example, arranged directly above the rotary furnace 1, and it is also beneficial to arrange three or more, as long as the space is sufficient, which is not limited here.

[0070] In some embodiments of the present application, the first pad 16 is circumferentially arranged outside the converter 1. The first pad 16 can be one arranged along the entire circumference or multiple arranged along the entire circumference at intervals. The knocking head 70 acts on the first pad 16 to knock the converter 1, so as to avoid deformation or even damage of the converter 1 caused by the knocking head 70 directly knocking the converter 1 for a long time. When the first pad 16 is multiple arranged along the entire circumference at intervals, a certain gap is left between the ends of adjacent first pads 16 as a space allowance for thermal expansion. The first pad 16 has the same material as the converter 1, so as to avoid the converter 1 being corroded by reacting with the second pad 17 at high temperature when working.

[0071] In some embodiments of the present application, as shown in FIGS. 1 and 3, the gas source pressure in the gas source device 400 is 0.35-0.7 MPa. Thus, the gas source pressure can be adjusted in a large range, so as to be adjusted flexibly according to the sintering process of specific materials, the actual bonding condition, the material of the converter 1, etc. The knocking force can be ensured to effectively clean the converter 1, while the knocking force is prevented from being too large to cause local deformation or even damage of the converter 1, and the energy-saving purpose can be considered. For example, the gas source pressure can be adjusted according to the discharging condition of the converter 1. If it is confirmed that there is skin material in the converter 1, the skin material is discharged little or not discharged under low pressure, and then the gas source pressure can be appropriately increased to knock down the skin material. The gas source pressure can be adaptively adjusted according to the actual condition, so as to improve the cleaning effect.

[0072] In some embodiments of the present application, as shown in FIGS. 1 and 3, the knocking frequency of the knocking device 200 is 1 time / 5 s-5 min, for example, 1 time every 5 s, or 1 time every 30 s, or 1 time every 1 min, or 1 time every 1.5 min, or 1 time every 2 min, or 1 time every 2.5 min, or 1 time every 3 min, or 1 time every 3.5 min, or 1 time every 4 min, or 1 time every 4.5 min, or 1 time every 5 min, etc. Thus, the knocking frequency can be adjusted in a large range, so as to be adjusted flexibly according to the sintering process of specific materials, the actual bonding condition, the material of the converter 1, the rotating speed, etc. The knocking frequency can be ensured to effectively clean the converter 1, while the knocking frequency is prevented from being too high or the knocking position being fixed for a long time to cause local deformation or even damage of the converter 1, and the energy-saving purpose can be considered. For example, the knocking frequency can be adjusted according to the discharging condition of the converter 1. If it is confirmed that there is skin material in the converter 1, the skin material is discharged little or not discharged under long time interval, and then the interval time can be appropriately shortened, i.e. the knocking frequency is increased, to knock down the skin material. The knocking frequency can be adaptively adjusted according to the actual condition, so as to improve the cleaning effect.

[0073] In the embodiments of the present application, the timing of the knocking can be set according to specific conditions, for example, the knocking can be performed during the sintering process, or the knocking can be performed after the sintering process, or the knocking can be performed both during the sintering process and after the sintering process, and the knocking can be performed by setting the knocking time point, for example, the knocking can be performed every few minutes or every few seconds.

[0074] When the knocking device 200 is connected with the air source device 400 to drive the knocking device 200 to knock by the air source device 400, the knocking device 200 can be a pneumatic hammer knocker 7. The pneumatic hammer knocker 7 is driven by air, and uses compressed air compressed by an air compressor to drive the pneumatic hammer knocker 7 to knock the converter 1. The knocking frequency and the knocking strength of the pneumatic hammer knocker 7 are controlled by the air source device 400, so that the knocking process is adjustable and controllable, and different actual requirements can be matched. The air source device 400 can include an air source pressure control system 91, a solenoid valve 92, an air source pipe 93, and a time relay 94, etc. The air source pressure control system 91 uses a filter pressure regulating valve to control the air source pressure, and freely selects and adjusts the air source pressure to control the knocking strength. The solenoid valve 92 controls the working of the pneumatic hammer knocker 7 by on-off electricity. The time relay 94 can flexibly control the knocking time and the knocking interval time according to the process requirements, and the operation is simple and convenient. An external switch is used to freely control the opening and closing of the knocking system.

[0075] Exemplarily, as shown in FIG. 1 and FIG. 5, the SK80 pneumatic hammer 7 (using pressure of 0.35-0.7 MPa, air consumption of 0.455 L / round, impact force of 19.3-29.5 N, body weight of 7.9 kg, total weight of 11.8 kg, and body material of aluminum) is selected, and the magnetic piston 73 (i.e., the piston with the permanent magnet 72) is fixed on the metal base plate 71 by strong magnetic force in the state without compressed air. When the solenoid valve 92 is energized, the compressed air flows into the body of the pneumatic hammer 7, and the pressure in the body increases. When the pressure in the body is greater than the magnetic force, the magnetic piston 73 separates from the metal base plate 71 at high speed, and the strong counterforce is generated due to the reaction force of the strong magnetic force. The magnetic piston 73 falling at high speed transmits the impact force to the converter 1 by impact, and knocks the adhered material in the converter 1 with strong impact force. When the solenoid valve 92 is de-energized, the compressed air in the body of the pneumatic hammer 7 is discharged through the solenoid valve 92, and then the magnetic piston 73 is slowly lifted to approach the metal base plate 71 again by the return spring 832, and is restored to the initial state by the magnetic force tightly fixed on the metal base plate 71. After the test, after the material produced by using the pneumatic hammer 7 is sieved, the proportion of the sieve residue increases (0.07-0.64%), wherein the sieve residue refers to the remaining part of the produced material after sieving, i.e., the material with too large particle size, the adhered lumps or the skin material, thereby indicating that the impact can effectively knock down the adhered material or the skin material on the inner wall of the converter 1, to a certain extent, avoid the wall adhesion lumps being too large and excessively sintered, affect the performance of the material, or react with the wall of the converter 1 to produce impurities.

[0076] It can be understood that the model of the pneumatic hammer 7 can be flexibly selected, for example, the model of the pneumatic hammer 7 can be adjusted according to the wall thickness of the converter 1, the strength of the converter 1, etc., to achieve different impact effects. More specifically, the appropriate pneumatic hammer 7 can be selected by analyzing the converter 1, so that the impact process does not cause deformation of the structure of the converter 1, etc. The magnetic piston 73 can be used as the impact head 70, or connected with the impact head 70 to drive the impact head 70 to impact.

[0077] In some embodiments of the present application, as shown in FIG. 6, the impact device 200 includes a plurality of impact units 8 arranged at intervals along the circumference of the converter 1. Exemplarily, any one of the first impact device 61, the second impact device 62 and the third impact device 63 can be configured in the form of the plurality of impact units 8 arranged at intervals along the circumference of the converter 1. Each impact unit 8 includes a pipe member 81 and an impact member 82. One end of the pipe member 81 is fixed to the converter 1, and the other end extends away from the central axis of the converter 1, for example, in the form of inclination (as shown in FIG. 7) or bending (as shown in FIG. 6). The impact member 82 is arranged in the pipe member 81 and is slidable relative to the pipe member 81 and used to impact the converter 1.

[0078] For example, the rotating speed of the converter 1 is 8-15 minutes / revolution, and due to the slow rotating speed of the converter 1, the centrifugal force of the knocking member 82 is close to 0, and during the process that the pipe member 81 rotates with the converter 1, when the pipe member 81 moves to the top or oblique top of the converter 1, the knocking member 82 slides downward in the pipe member 81 under the action of gravity and directly or indirectly knocks the converter 1. Wherein, due to the inclined form (for example, as shown in FIG. 7), the bending form (for example, as shown in FIG. 6) or the circular arc form of the pipe member 81, the knocking can be more effectively carried out.

[0079] For example, a plurality of hollow pipe members 81 are arranged on the outer wall of the converter 1 in the circumferential direction, the knocking member 82 is arranged in the pipe member 81, and when the converter 1 rotates, the knocking member 82 moves in the pipe member 81, falls and knocks the outer wall of the converter 1. For example, the knocking member 82 can be a ball, so as to reduce the frictional resistance between the pipe member 81 and the knocking member 82 and reduce the loss.

[0080] In some embodiments of the present application, in combination with FIG. 7, the second pad 17 is arranged on at least one of the inside of the pipe member 81 and the outer wall of the converter 1, and the knocking member 82 acts on the second pad 17 to knock the converter 1, so as to provide a buffering effect, avoid the knocking member directly knocking the converter 1 for a long time to cause deformation or even damage; the second pad 17 can be of an elastic material, or preferably of the same material as the converter 1, so as to avoid the converter 1 being heated during work and then reacting with the second pad 17 at high temperature, causing the converter 1 to be corroded.

[0081] In some embodiments of the present application, as shown in FIG. 8, the inside of the end of the pipe member 81 close to the converter 1 is provided with an elastic float 83, the elastic float 83 includes a float 831 and a spring 832, the spring 832 is used to push the float 831 to move away from the converter 1, the area of the float 831 is larger than that of the knocking member 82, and the knocking member 82 knocks the converter 1 through the float 831. It is worth noting that the elastic float 83 can include a floating member and a spring 832, the spring 832 pushes the floating member to move away from the converter 1, the knocking member 82 hits the floating member, and the floating member knocks the converter 1 by overcoming the force of the spring 832. Since the area of the floating member is relatively larger than that of the knocking member 82, the knocking range can be improved, which is beneficial to improve the cleaning effect, and at the same time, the buffering effect can be provided to avoid the knocking member directly knocking the converter 1 for a long time to cause damage.

[0082] In some embodiments of the present application, as shown in FIG. 6, the number of the knocking units 8 included in the knocking device 200 is not limited, for example, the number of the knocking units 8 is at least six, so as to facilitate knocking at more positions and improve the cleaning effect. Of course, the present application is not limited thereto, and the number of the knocking units 8 can also be less than six, for example, it can also be three, four (for example, as shown in FIGS. 7 and 8), five, etc.

[0083] In some embodiments of the present application, the knocking units 8 in the at least two knocking devices 200 arranged along the axial direction of the converter 1 can be aligned (for example, taking the cross section of the converter 1 as a projection plane, the projection of the plurality of knocking units 8 in one of the knocking devices 200 on the projection plane is one-to-one coincident with the projection of the plurality of knocking units 8 in the other of the knocking devices 200 on the projection plane), or staggered (for example, taking the cross section of the converter 1 as a projection plane, the projection of the plurality of knocking units 8 in one of the knocking devices 200 on the projection plane is one-to-one staggered with the projection of the plurality of knocking units 8 in the other of the knocking devices 200 on the projection plane), so that flexible arrangement can be achieved, and when staggered, the total knocking point positions in the circumferential direction of the converter 1 are more, which is beneficial to improve the knocking effect.

[0084] In some embodiments of the present application, the driving device 4 is arranged between the holding section 102 and the cooling section 103, that is, the driving device 4 is arranged corresponding to the connection between the second furnace section 12 and the third furnace section 13, so that the driving device 4 is not close to the edge of the converter 1, and the influence of heat radiation can be reduced, so that the driving device 4 can drive the rotation of the entire converter 1 more reliably.

[0085] For example, in combination with FIGS. 2 and 4, the driving device 4 can include a driving motor 41, a speed reducer 42, and a transmission gear 43, and the converter 1 is surrounded by a gear ring 44, the transmission gear 43 is engaged with the gear ring 44, and the driving motor 41 drives the transmission gear 43 to rotate through the speed reducer 42. Thus, through the driving motor 41, the speed reducer 42, the transmission gear 43, and the gear ring 44, the driving of the rotation of the converter 1 can be achieved, and the rotation speed of the converter 1 can be easily made lower, for example, the rotation speed of the converter 1 can be 8-15 minutes / revolution.

[0086] In some embodiments of the present application, the rotary sintering furnace 1000 is a lithium iron phosphate rotary sintering furnace. In combination with FIG. 9, the rotary furnace 1 includes a furnace body 1a and helical blades 1b arranged on the inner wall of the furnace body 1a to rotate synchronously. The furnace body 1a and the helical blades 1b are made of stainless steel or alloy material, and the inner wall of the furnace body 1a and the surface of the helical blades 1b are polished to have a surface finish less than 3 μm, preferably less than 1.5 μm, which can effectively reduce the occurrence of material sticking to the wall for sintering of lithium iron phosphate positive electrode material. In addition, a coating of a specific material, such as a ceramic coating or an alloy coating, is formed on the inner wall of the furnace body 1a or the helical blades 1b, thereby imparting smoothness, high temperature resistance and corrosion resistance to the surface of the inner wall of the furnace body 1a or the helical blades 1b, reducing the sticking of the material to the wall or avoiding excessive sintering of the material after sticking to the wall, thereby causing corrosion of the furnace body 1a and exceeding the magnetic material content of the material. Therefore, the rotary furnace 1 has good high temperature resistance, and the smooth surface is beneficial to reduce the sticking rate of the material. For example, the material of the rotary furnace 1 can be selected from 304 stainless steel, 310S stainless steel, Inconel601 nickel-based high temperature alloy, Inconel625 nickel-based high temperature alloy and other materials having a temperature resistance of 1000-1200°C or higher, and excellent stainless corrosion resistance and good intergranular corrosion resistance, which can effectively improve the introduction of magnetic material into lithium iron phosphate during high temperature sintering.

[0087] It is worth noting that the length of the rotary furnace 1 is not limited, for example, it can be 60-70 m.

[0088] In summary, the rotary sintering furnace 1000 of the embodiments of the present application knocks the rotary furnace 1 by the knocking device 200 to make the material sticking to the wall fall off, effectively solving the problem of material sticking to the wall affecting product quality and increasing economic benefits.

[0089] In the description of the present application, it should be understood that the terms "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0090] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0091] In this application, unless otherwise clearly indicated otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integral; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0092] In this application, unless otherwise clearly indicated otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0093] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0094] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotary sintering furnace, wherein: include: a furnace body assembly, the furnace body assembly comprising a heating section, a heat preservation section, and a cooling section, the furnace body assembly comprising a converter, a first heating device for heating the converter in the heating section, a second heating device for heating the converter in the heat preservation section, a cooling device for cooling the converter in the cooling section, and a driving device for driving the converter to rotate; and A knocking device is used to knock the converter, and includes a first knocking device arranged between the heating section and the insulation section, and / or a second knocking device arranged between the insulation section and the cooling section.

2. The rotary sintering furnace according to claim 1, wherein: The furnace body assembly is provided with a first thermal insulation shell at the heating section, and a second thermal insulation shell is provided at the thermal insulation section, and the first thermal insulation shell and the second thermal insulation shell are arranged at intervals; wherein, the first knocking device is provided at the interval between the first thermal insulation shell and the second thermal insulation shell; and / or, the second knocking device is provided on a side of the second thermal insulation shell away from the first thermal insulation shell.

3. The rotary sintering furnace according to claim 2, wherein: The first heating device is placed outside the converter and fixed in the first thermal insulation shell, and the second heating device is placed outside the converter and fixed in the second thermal insulation shell. The first heating device and the second heating device both include a heating unit, and the heating unit includes a plurality of electric heaters arranged side by side along the length direction of the converter.

4. The rotary sintering furnace according to claim 3, wherein: The heating units are respectively provided on the top and the bottom of the converter.

5. The rotary sintering furnace according to any one of claims 1 to 4, wherein: The cooling device comprises an outer cover shell and a spray device. The spray device is arranged outside the converter, and the outer cover shell is arranged outside the spray device.

6. The rotary sintering furnace according to any one of claims 1 to 5, wherein: The knocking device is externally disposed on the furnace body assembly; And / or, the knocking device further comprises a third knocking device, and the third knocking device is provided on a side of the heating section away from the heat preservation section; And / or, the knocking device further includes a plurality of fourth knocking devices, and the fourth knocking devices are arranged in the heating section and / or the heat preservation section.

7. The rotary sintering furnace according to any one of claims 1 to 6, wherein: It also includes a bracket and an air source device; the knocking device includes a retractable knocking head; The bracket is arranged outside the converter, the converter rotates relative to the bracket, the knocking device is arranged on the bracket, the gas source device is arranged on the bracket and connected to the knocking device, driving the knocking head to extend and retract to knock the converter.

8. The rotary sintering furnace according to claim 7, wherein: The axis of the converter is arranged horizontally, the knocking device is arranged higher than the central horizontal plane of the converter, and the angle a1 between the telescopic direction of the knocking head and the central horizontal plane of the converter is 10°-80°.

9. The rotary sintering furnace according to claim 8, wherein: One knocking device is respectively provided on both sides of the central vertical plane of the converter, and the two knocking devices are symmetrically arranged about the central vertical plane, and the angle a2 between the telescopic directions of the two knocking devices is 30°-120°.

10. The rotary sintering furnace according to claim 9, wherein: The bracket includes vertical frames located on both sides of the converter, a horizontal frame connected between the two vertical frames, and an oblique frame connected between the vertical frames and the horizontal frame. The gas source device is installed on the vertical frames, and the knocking device is installed on the oblique frame.

11. The rotary sintering furnace according to any one of claims 7 to 10, wherein: A first pad is provided on the outer circumference of the converter, and the striking head acts on the first pad to strike the converter; And / or, the air source pressure of the air source device is 0.35 MPa-0.7 MPa, and the knocking frequency of the knocking device is 1 time / 5 seconds to 5 minutes.

12. The rotary sintering furnace according to claim 1, wherein: The knocking device includes a plurality of knocking units arranged at intervals along the circumference of the converter, each of the knocking units includes a pipe member and a knocking member, one end of the pipe member is fixed to the converter, and the other end extends in a direction away from the central axis of the converter, the knocking member is arranged in the pipe member and can slide relative to the pipe member and is used to knock the converter.

13. The rotary sintering furnace according to claim 12, wherein: A second cushion is provided inside the pipe member and / or on the outer wall of the converter, and the knocking member acts on the second cushion to knock the converter; And / or, an elastic float is provided inside the end of the pipe member close to the converter, the elastic float includes a float and a spring, the spring is used to push the float to move in a direction away from the converter, the area of ​​the float is larger than the area of ​​the knocking member, and the knocking member knocks the converter through the float.

14. The rotary sintering furnace according to any one of claims 1 to 13, wherein: The driving device is arranged between the insulation section and the cooling section, and includes a driving motor, a reducer and a transmission gear. The converter is surrounded by a ring gear, the transmission gear is engaged with the ring gear, and the driving motor drives the transmission gear to rotate through the reducer; and / or the rotation speed of the converter is 8-15 minutes per revolution.

15. The rotary sintering furnace according to any one of claims 1 to 14, wherein: The rotary sintering furnace is a lithium iron phosphate rotary sintering furnace, which includes a furnace body and spiral blades. The spiral blades are arranged on the inner wall of the furnace body to rotate synchronously. The furnace body and the spiral blades are both made of stainless steel or alloy; and / or the surface polishing degree of the inner wall of the furnace body and the spiral blades is less than 3μm.

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