Movable box-type graphitization furnace and working method thereof

Abstract

The invention belongs to the technical field of furnace charge control, particularly relates to furnace charge control for discharging of a baking furnace, and particularly relates to a movable box-type graphitization furnace and a working method thereof. According to the movable box-type graphitization furnace disclosed by the invention, the movable platform is arranged at the top of the graphitization furnace and provides a movable platform for the auxiliary material transfer bin, so that the auxiliary material transfer bin can transversely and longitudinally move along the furnace top of the graphitization furnace and is aligned with each graphite cavity; the electromagnetic floating connector is arranged to control opening and closing of the discharging partition plate of the auxiliary material transfer bin, and the discharging mode of the auxiliary material transfer bin is changed from traditional valve control opening and closing to electromagnetic control partition plate opening and closing, so that valve faults caused by high temperature of the graphitization furnace are avoided; and the problem of electric control failure caused by valve faults of the auxiliary material transfer bin is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of furnace charge control, and specifically relates to a furnace charge control for unloading a baking furnace, and more particularly to a mobile box-type graphitization furnace and a working method thereof. Background Art

[0002] Graphitization is the main processing method for lithium battery raw materials. Through high-temperature graphitization of carbon materials, carbon atoms are rearranged to form a hexagonal network layer stacking structure, transforming it into a graphite material with excellent performance.

[0003] Mobile box-type graphitization furnace is a commonly used equipment for graphitization of carbon materials. It graphitizes carbon materials by high-temperature heating. In order to ensure the graphitization effect, auxiliary materials are usually loaded on the top of the graphite furnace after the raw materials are loaded to isolate the heat in the furnace from dissipating upward, thereby improving the graphitization effect.

[0004] The existing auxiliary material feeding system usually adopts AGV transfer bin and lifting platform. Since the transfer bin needs to be disassembled before loading, it is necessary to reserve redundant solenoid valve connection lines for the transfer bin. However, the redundant connection lines will be placed on the top of the graphitization furnace, which is prone to damage and causes failure of the electronic control of the transfer bin.

[0005] There is an urgent need to provide a mobile box-type graphitization furnace and a working method thereof to solve the technical problem of electrical control failure in the transfer bin in the related technology.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0007] The embodiment of the present disclosure at least provides a mobile box-type graphitization furnace, comprising: A graphitization furnace, wherein a plurality of graphite chambers are arranged inside; A mobile platform mounted on top of the graphitization furnace; and An auxiliary material transfer bin is slidably disposed on the mobile platform; and The electromagnetic floating joint is arranged on the mobile platform and is configured to adjust the opening and closing of the unloading partition of the auxiliary material transfer bin.

[0008] In an optional embodiment, the mobile platform includes a supporting beam and a moving guide rail disposed on the supporting beam; and A movable slider adapted to the movable guide rail is provided on the auxiliary material transfer bin; The auxiliary material transfer bin is suitable for sliding along the movable guide rail so that its unloading end is aligned with each graphite cavity in the graphitization furnace in sequence.

[0009] In an optional embodiment, the auxiliary material transfer bin includes: a bin body and a feed pipe; A material discharge partition is provided between the bin body and the material discharge pipe; The material discharge baffle is configured to control the opening and closing of the material discharge end of the bin body so that the auxiliary material in the bin body falls into the material discharge pipe.

[0010] In an optional embodiment, the auxiliary material transfer bin further includes: a weighing frame sleeved on the periphery of the bin body; The weighing frame is arranged above the mobile platform, and a weighing module is arranged between the weighing frame and the mobile platform; The weighing module is configured to obtain the weight of the auxiliary materials in the bin.

[0011] In an optional embodiment, the weighing module includes: a control module and a weighing sensor; The weighing sensor is configured to obtain the weight of the bin body; and The control module is configured to obtain weighing data from the weighing sensor and control the opening and closing of the unloading partition according to the weighing data.

[0012] In an optional embodiment, the electromagnetic floating joint includes: a driving device and an electromagnetic device; The electromagnetic device is configured to pull the rod of the blanking partition to open the blanking partition; and The driving device is configured to drive the electromagnetic device to approach or move away from the unloading partition.

[0013] In an optional embodiment, the driving device is electrically connected to the control module, and the control module is adapted to control the movement of the driving device according to the weighing data; and The electromagnetic device is electrically connected to the control module, and the control module is configured to control the start and stop of the electromagnetic device.

[0014] This embodiment also provides a working method of a mobile box-type graphitization furnace, including: Obtain the weighing data of the auxiliary material transfer bin to obtain the weight data of the auxiliary materials in the auxiliary material transfer bin; The electromagnetic device is controlled to start and stop according to the weight data of the auxiliary materials in the auxiliary material transfer bin, thereby controlling the opening and closing of the unloading partition.

[0015] In an optional embodiment, the method of obtaining the weighing data of the auxiliary material transfer bin to obtain the weight data of the auxiliary material in the auxiliary material transfer bin includes: The residual weight of auxiliary materials in the current auxiliary material transfer bin is obtained through the weighing sensor.

[0016] In an optional embodiment, the method of controlling the start and stop of the electromagnetic device according to the weight data of the auxiliary materials in the auxiliary material transfer bin, and then controlling the opening and closing of the unloading partition includes: When the weight of the residual auxiliary materials in the auxiliary material transfer bin reaches a preset threshold, the electromagnetic device is controlled to cut off the power so that the unloading partition is closed.

[0017] The beneficial effect of the present invention is that the mobile box-type graphitization furnace of the present invention provides a mobile platform to the auxiliary material transfer bin through the mobile platform arranged on the top of the graphitization furnace, so that the auxiliary material transfer bin can move laterally and longitudinally along the furnace top of the graphitization furnace, and then align with each graphite cavity, and control the opening and closing of the unloading partition of the auxiliary material transfer bin by the electromagnetic floating joint, and change the unloading mode of the auxiliary material transfer bin from the traditional valve-controlled opening and closing to the electromagnetic-controlled partition opening and closing, thereby avoiding valve failure caused by the high temperature of the graphitization furnace and avoiding the problem of electric control failure of the auxiliary material transfer bin due to valve failure.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a mobile box-type graphitization furnace provided in an embodiment of the present disclosure is shown; Figure 2 A schematic diagram of the three-dimensional structure of the auxiliary material transfer bin provided in an embodiment of the present disclosure is shown; Figure 3 A schematic diagram showing the matching relationship between the electromagnetic floating joint and the bin body provided in an embodiment of the present disclosure is shown; Figure 4 A schematic diagram of the three-dimensional structure of a blanking baffle provided in an embodiment of the present disclosure is shown; In the figure: 1. Mobile platform; 11. Support beam; 12. Mobile guide rail; 2. Auxiliary material transfer bin; 21. Bin body; 22. Discharge pipe; 23. Weighing frame; 231. Weighing sensor; 24. Discharge partition; 241. Rod body; 3. Electromagnetic floating joint; 31. Driving device; 32. Electromagnetic device; 4. Graphitization furnace; 40. Graphite cavity. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. 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.

[0023] In the related art, during the use of a box-type graphitization furnace, in order to control the discharge of auxiliary materials, a solenoid valve is usually used to control the opening and closing of the transfer bin to achieve precise material replenishment. However, since the solenoid valve requires wires to be used, and the wires need to move with the transfer bin on the table, the redundant wires of the solenoid valve are placed on the top of the graphitization furnace. Since the graphitization furnace will be in a high temperature state for a long time, the wires will inevitably be damaged due to heat, which will lead to failure of the solenoid valve control.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, in the drawings, the thickness of the components may be exaggerated or reduced in order to effectively describe the technical content.

[0025] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] See also Figure 1 , Figure 1 A mobile box-type graphitization furnace is shown, comprising: a mobile platform 1, mounted on the top of the graphitization furnace 4; and an auxiliary material transfer bin 2, slidably arranged on the mobile platform 1; and an electromagnetic floating joint 3, arranged on the mobile platform 1 and configured to adjust the opening and closing of the unloading baffle 24 of the auxiliary material transfer bin 2.

[0027] In the present embodiment, a mobile platform 1 is provided to the auxiliary material transfer bin 2 by means of a mobile platform 1 arranged on the top of the graphitization furnace 4, so that the auxiliary material transfer bin 2 can move laterally and longitudinally along the furnace top of the graphitization furnace 4, and then align with each graphite cavity 40, and the opening and closing of the unloading baffle 24 of the auxiliary material transfer bin 2 is controlled by the electromagnetic floating joint 3, and the unloading mode of the auxiliary material transfer bin 2 is changed from the traditional valve-controlled opening and closing to the electromagnetic-controlled baffle opening and closing, thereby avoiding valve failure caused by the high temperature of the graphitization furnace 4 and avoiding the problem of electrical control failure of the auxiliary material transfer bin 2 due to valve failure.

[0028] See also Figure 2 In this embodiment, the mobile platform 1 includes a supporting beam 11 and a moving guide rail 12 arranged on the supporting beam 11; and the auxiliary material transfer bin 2 is provided with a moving slider adapted to the moving guide rail 12; wherein the auxiliary material transfer bin 2 is suitable for sliding along the moving guide rail 12 so that its unloading end is aligned with each graphite cavity 40 in the graphitization furnace 4 in turn.

[0029] See also Figure 2 and Figure 3 In this embodiment, the auxiliary material transfer bin 2 includes: a bin body 21 and a discharge pipe 22; a discharge baffle 24 is arranged between the bin body 21 and the discharge pipe 22; wherein the discharge baffle 24 is configured to control the opening and closing of the discharge end of the bin body 21 so that the auxiliary material in the bin body 21 falls into the discharge pipe 22.

[0030] In this embodiment, the unloading baffle 24 includes: a baffle seat and a baffle body. The two end surfaces of the baffle seat are respectively connected to the unloading end of the bin body 21 and the feeding end of the unloading pipe 22. The unloading baffle 24 is set in the baffle seat in a sliding manner. The sliding of the unloading baffle 24 makes the bin body 21 and the unloading pipe 22 connected, thereby realizing unloading.

[0031] Specifically, the rod body 241 of the blanking baffle 24 cooperates with the electromagnetic floating joint 3. The specific cooperation method is that the driving device 31 of the electromagnetic floating joint 3 drives its high temperature resistant electromagnetic device 32 to move along the Figure 3 The driving device 31 moves the electromagnetic device 32 toward the rod 241 of the material discharging baffle 24, and the driving device 31 moves the electromagnetic device 32 toward the rod 241. The electromagnetic device 32 is energized and magnetized, and the rod 241 of the material discharging baffle 24 is attracted by the magnetic force. Then the driving device 31 drives the electromagnetic device 32 to retreat, and then pulls the material discharging baffle 24 to retreat, so that the material discharging baffle 24 is moved away from between the warehouse body 21 and the material discharging pipe 22, so that the warehouse body 21 is connected with the material discharging pipe 22 for material discharging. After the material discharging is completed, the driving device 31 pushes the material discharging baffle 24 to move between the warehouse body 21 and the material discharging pipe 22 again, closes the passage between the warehouse body 21 and the material discharging pipe 22, and the electromagnetic device 32 is powered off and follows the driving device 31 back to the starting position.

[0032] As an optional embodiment, the electromagnetic device 32 includes but is not limited to an electromagnet, and the method of resetting the unloading partition 24 includes but is not limited to resetting and closing by pulling with a spring provided thereon.

[0033] As an optional implementation, the driving device 31 of the electromagnetic floating joint 3 includes but is not limited to a hydraulic cylinder.

[0034] See also Figure 2 and Figure 4 In this embodiment, the auxiliary material transfer warehouse 2 also includes: a weighing frame 23 mounted on the periphery of the warehouse body 21; the weighing frame 23 is arranged above the mobile platform 1, and a weighing module is arranged between the weighing frame 23 and the mobile platform 1; the weighing module is configured to obtain the weight of the auxiliary material in the warehouse body 21.

[0035] Specifically, the weight of the bin body 21 is obtained through the set weighing module, so as to obtain the weight data of the auxiliary materials in the bin body 21, and then it is convenient to control the discharge of the auxiliary materials. The specific control method is: the weighing data of the bin body 21 is obtained through the weighing sensor 231, and the weighing data of the bin body 21 when the bin is empty is subtracted from the obtained weighing data to obtain the weight data of the auxiliary materials. The opening and closing of the discharge partition 24 is controlled according to the weight data of the auxiliary materials, so as to control the discharge amount of the auxiliary materials.

[0036] As an optional embodiment, the weighing sensor 231 obtains that the weight of the warehouse body 21 is 100kg, and the empty warehouse weighing data of the warehouse body 21 is 20kg. At this time, the weight of the auxiliary material in the warehouse body 21 is 80kg. If the unloading amount needs to be 5kg, the unloading partition 24 is closed when the weight of the warehouse body 21 reaches 95kg to complete a single unloading.

[0037] See also Figure 3 In this embodiment, the electromagnetic floating joint 3 includes: a driving device 31 and an electromagnetic device 32; the electromagnetic device 32 is configured to pull the rod body of the unloading baffle 24 to open the unloading baffle 24; and the driving device 31 is configured to drive the electromagnetic device 32 to approach or move away from the unloading baffle 24.

[0038] Specifically, the driving device 31 is electrically connected to the control module, and the control module is suitable for controlling the movement of the driving device 31 according to the weighing data; and the electromagnetic device 32 is electrically connected to the control module, and the control module is configured to control the start and stop of the electromagnetic device 32.

[0039] In this embodiment, the electromagnetic device 32 includes but is not limited to the use of an electromagnet, and since the electromagnet is arranged on the mobile platform 1, its power cord can be set to a fixed length, that is, its power cord can be set on the weighing frame 23, and it is powered by a small electrical cabinet arranged on the weighing frame 23. Since the electromagnetic device 32 always moves synchronously with the mobile platform 1, its power cord is convenient for heat insulation. However, since the auxiliary material transfer bin 2 is often configured in a detachable manner, it is removed for loading and then installed on the mobile platform 1 for loading and unloading. If a solenoid valve is used as its unloading control component, the wires of the solenoid valve need to be repeatedly connected to the small electrical cabinet, that is, the wires must be exposed, thereby causing heat damage.

[0040] Specifically, the driving device 31 includes but is not limited to the use of a hydraulic cylinder. After the hydraulic cylinder drives the electromagnet to approach the rod body of the unloading baffle 24, the electromagnet is energized to generate magnetic force to attract the rod body, and then the unloading baffle 24 is pulled open by the movement of the hydraulic cylinder to realize the unloading of the warehouse body 21. The unloading baffle 24 is reset by resetting the hydraulic cylinder to realize the unloading closure of the warehouse body 21.

[0041] On the other hand, the present embodiment also provides a working method of a mobile box-type graphitization furnace, including: obtaining the weighing data of the auxiliary material transfer bin 2 to obtain the weight data of the auxiliary material in the auxiliary material transfer bin 2; controlling the start and stop of the electromagnetic device 32 according to the weight data of the auxiliary material in the auxiliary material transfer bin 2, and then controlling the opening and closing of the unloading partition 24.

[0042] Herein, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component, or a third component may be interposed between the first component and the second component.

[0043] In this article, when an element or layer is referred to as being "located on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly located on, engaged, connected, attached to, or coupled to another element or layer, or there may be intermediate elements or layers. In contrast, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intermediate elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0045] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0046] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0047] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0049] Spatially relative terms, such as "inside", "outside", "below", "below", "down", "above", "on", etc., may be used herein to facilitate description of the relationship of one element or feature to another element or feature as illustrated in the figure. In addition to the orientation depicted in the figure, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is turned over, the elements described as "below" or "below" other elements or features will be oriented to be "above" other elements or features. Therefore, the example term "below" can cover the orientation above and below. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0050] In the above discussion, unless otherwise stated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0051] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mobile box-type graphitization furnace, characterized in that: include: A graphitization furnace (4) having a plurality of graphite cavities (40) disposed therein; A mobile platform (1) is mounted on the top of the graphitization furnace (4); and An auxiliary material transfer bin (2) is slidably arranged on the mobile platform (1); and The electromagnetic floating joint (3) is arranged on the mobile platform (1) and is configured to adjust the opening and closing of the unloading partition (24) of the auxiliary material transfer bin (2).

2. The mobile box-type graphitization furnace according to claim 1, characterized in that: The mobile platform (1) comprises a supporting crossbeam (11) and a moving guide rail (12) arranged on the supporting crossbeam (11); and The auxiliary material transfer bin (2) is provided with a movable sliding block adapted to the movable guide rail (12); wherein The auxiliary material transfer bin (2) is suitable for sliding along the movable guide rail (12) so that its unloading end is aligned with each graphite cavity (40) in the graphitization furnace (4) in sequence.

3. The mobile box-type graphitization furnace according to claim 1, characterized in that: The auxiliary material transfer bin (2) comprises: a bin body (21) and a material discharge pipe (22); A material discharge partition (24) is provided between the bin body (21) and the material discharge pipe (22); wherein The material discharge baffle (24) is configured to control the opening and closing of the material discharge end of the bin body (21), so that the auxiliary material in the bin body (21) falls into the material discharge pipe (22).

4. The mobile box-type graphitization furnace according to claim 3, characterized in that: The auxiliary material transfer bin (2) further comprises: a weighing frame (23) sleeved on the periphery of the bin body (21); The weighing frame (23) is arranged above the mobile platform (1), and a weighing module is arranged between the weighing frame (23) and the mobile platform (1); The weighing module is configured to obtain the weight of the auxiliary material in the bin body (21).

5. The mobile box-type graphitization furnace according to claim 4, characterized in that: The weighing module comprises: a control module and a weighing sensor (231); The weighing sensor (231) is configured to obtain the weight of the bin body (21); and The control module is configured to obtain weighing data from a weighing sensor (231), and to control the opening and closing of a material discharge partition (24) according to the weighing data.

6. The mobile box-type graphitization furnace according to claim 5, characterized in that: The electromagnetic floating joint (3) comprises: a driving device (31) and an electromagnetic device (32); The electromagnetic device (32) is configured to pull the rod body (241) of the material removal baffle (24) to open the material removal baffle (24); and The driving device (31) is configured to drive the electromagnetic device (32) to move closer to or farther away from the unloading partition (24).

7. The mobile box-type graphitization furnace according to claim 6, characterized in that: The driving device (31) is electrically connected to the control module, and the control module is suitable for controlling the movement of the driving device (31) according to the weighing data; and The electromagnetic device (32) is electrically connected to the control module, and the control module is configured to control the start and stop of the electromagnetic device (32).

8. A working method of a mobile box-type graphitization furnace, characterized in that: include: Obtaining weighing data of the auxiliary material transfer bin (2) to obtain weight data of the auxiliary material in the auxiliary material transfer bin (2); The electromagnetic device (32) is controlled to start and stop according to the weight data of the auxiliary materials in the auxiliary material transfer bin (2), thereby controlling the opening and closing of the material discharge partition (24).

9. The operating method of the mobile box-type graphitization furnace according to claim 8, characterized in that: The method for obtaining the weighing data of the auxiliary material transfer bin (2) to obtain the weight data of the auxiliary material in the auxiliary material transfer bin (2) comprises: The weight of the residual auxiliary material in the auxiliary material transfer bin (2) is obtained through the weighing sensor (231).

10. The operating method of the mobile box-type graphitization furnace according to claim 9, characterized in that: The method for controlling the start and stop of the electromagnetic device (32) according to the weight data of the auxiliary materials in the auxiliary material transfer bin (2), thereby controlling the opening and closing of the unloading partition (24), comprises: When the weight of the residual auxiliary material in the auxiliary material transfer bin (2) reaches a preset threshold value, the electromagnetic device (32) is controlled to be powered off, so that the unloading partition (24) is closed.

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