A closed unloading system

Abstract

The utility model provides a kind of closed unloading system, belong to unloading technical field, including the discharge bin, electromagnetic ash discharger and weighing device being sequentially arranged along the discharging direction. It also includes two protective structures, one protective structure is arranged between the discharge bin and the electromagnetic ash discharger, and the other protective structure is arranged between the electromagnetic ash discharger and the weighing device. Each protective structure is peripherally equipped with a sealing structure. Each protective structure includes an upper guard plate and a lower guard plate. The upper guard plate is fixedly arranged at the discharge end of the discharge bin or the discharge end of the electromagnetic ash discharger. The upper guard plate has an annular space. The lower guard plate is fixedly arranged at the feed end of the electromagnetic ash discharger or the feed end of the weighing device, and one end extends into the annular space. The upper guard plate and the lower guard plate form an annular structure to block the contact between the material and the sealing structure. The utility model provides a kind of closed unloading system, which bears the impact and friction of the material through the protective structure, avoiding direct contact between the material and the sealing structure.

Description

Technical Field

[0001] This utility model belongs to the field of unloading technology, and more specifically, relates to a closed unloading system. Background Technology

[0002] A lime kiln unloading system typically includes a discharge hopper, an electromagnetic ash discharger, and a weighing device. After lime is discharged from the discharge hopper, it falls into the electromagnetic ash discharger and is conveyed to the weighing device by its vibration. When the lime on the weighing device reaches a preset weight, the control system issues a command to stop the electromagnetic ash discharger from feeding, and then the weighing device opens its discharge port to unload the lime into the receiving hopper.

[0003] To suppress dust escape during unloading, existing technologies employ flexible sealing connections between the discharge hopper and the electromagnetic ash unloader, as well as between the electromagnetic ash unloader and the weighing device, to ensure a sealed connection between the devices. However, in actual operation, the falling lime material continuously impacts and rubs against these flexible sealing connections, causing severe wear and affecting their sealing performance and service life. Utility Model Content

[0004] The purpose of this invention is to provide a closed unloading system that aims to reduce the wear of the soft sealing connection structure by the material during unloading.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a closed unloading system is provided, including a discharge hopper, an electromagnetic ash unloader, and a weighing device arranged sequentially along the discharge direction, and also including two protective structures. One of the protective structures is disposed between the discharge hopper and the electromagnetic ash unloader, and the other protective structure is disposed between the electromagnetic ash unloader and the weighing device; each of the protective structures is equipped with a sealing structure around its periphery. Each of the aforementioned protective structures includes: The upper guard plate is fixedly installed at the discharge end of the discharge hopper or the discharge end of the electromagnetic ash unloader; the upper guard plate has an annular space. The lower guard plate is fixedly installed at the feed end of the electromagnetic ash unloader or the feed end of the weighing device, and one end extends into the annular space. The upper guard plate and the lower guard plate are combined to form a ring structure to prevent materials from contacting the sealing structure.

[0006] In one possible implementation, the upper guard plate includes: First annular vertical plate; The second annular vertical plate is located inside the first annular vertical plate, and forms an annular space between the two plates to accommodate the corresponding lower guard plate. A connecting horizontal plate is used to connect the first annular vertical plate and the second annular vertical plate.

[0007] In one possible implementation, the first annular vertical plate, the second annular vertical plate, and the connecting horizontal plate all have movable gaps with the corresponding lower guard plate.

[0008] In one possible implementation, the lower guard plate is connected to the feed end of the electromagnetic ash unloader or the feed end of the weighing device via an extended horizontal plate, and the extended horizontal plate is provided with a material leakage hole.

[0009] In one possible implementation, each of the sealing structures includes: The upper connecting plate is detachably installed at the discharge end of the discharge hopper or the discharge end of the electromagnetic ash unloader; The lower connecting plate is detachably installed at the feed end of the electromagnetic ash unloader or the feed end of the weighing device; A flexible connector cover is used to connect the upper connecting plate and the corresponding lower connecting plate.

[0010] In one possible implementation, the discharge bin is a conical structure with a cross-section that gradually decreases along the discharge direction. An arch-breaking component is provided inside the discharge bin. The arch-breaking component has an arch-breaking end facing the feed end of the discharge bin and a guide end facing the discharge end of the discharge bin.

[0011] In one possible implementation, the arch-breaking element includes: The arch-breaking section is connected to the inner wall of the discharge hopper via support legs; the arch-breaking section is conical with its tip pointing towards the feed end of the discharge hopper; the arch-breaking section constitutes the arch-breaking end; A flow guide is connected to the bottom end of the arch-breaking section; the flow guide is conical with its tip pointing towards the discharge end of the discharge hopper; the flow guide constitutes the flow guide end; The outer peripheral wall of the guide section and the inner peripheral wall of the discharge bin form a feeding channel to guide the material to fall, and the feeding channel is annular.

[0012] In one possible implementation, the distance between the outer peripheral wall of the guide section and the inner peripheral wall of the discharge bin remains constant along the discharge direction.

[0013] In one possible implementation, the arch-breaking component further includes: A transition section connects the arch-breaking section and the flow guide section; the cross-section of the transition section remains unchanged along the feeding direction.

[0014] In one possible implementation, the interior of the arch-breaking component forms a closed cavity, and an air inlet pipe and an air outlet pipe are respectively connected to both sides of the arch-breaking component. Both the air inlet pipe and the air outlet pipe extend outward through the discharge bin. The air inlet pipe is used to introduce cooling medium into the cavity, and the air outlet pipe is used to discharge the cooling medium after heat exchange from the cavity.

[0015] This utility model provides a closed-loop unloading system, which, compared with existing technologies, offers the following advantages: After the lime material is discharged from the discharge end of the discharge hopper, it first falls into the feed end of the electromagnetic ash discharger. Because the discharge end of the discharge hopper is equipped with an upper guard plate, and the feed end of the electromagnetic ash discharger is equipped with a lower guard plate, a continuous physical barrier is formed between the upper and lower guard plates. This ensures that the impact and friction of the falling material are primarily applied to the overlapping upper and lower guard plates, rather than directly to the surrounding sealing structure. This confines the material to the channel formed by the upper and lower guard plates, effectively preventing contact between the material and the sealing structure. Similarly, when the material is vibrated and conveyed by the electromagnetic ash discharger, another upper guard plate and the lower guard plate at the feed end of the weighing device prevent contact between the material and the sealing structure. This not only significantly reduces wear on the sealing structure and extends its service life but also maintains the system's airtightness, effectively preventing dust from escaping. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the closed unloading system provided in an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of a closed unloading system provided in an embodiment of the present invention.

[0019] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle.

[0020] In the diagram: 1. Discharge hopper; 2. Electromagnetic ash unloader; 3. Weighing device; 4. Protective structure; 41. Upper guard plate; 411. First annular vertical plate; 412. Second annular vertical plate; 413. Connecting horizontal plate; 42. Lower guard plate; 421. Extending horizontal plate; 4211. Material leakage hole; 5. Sealing structure; 51. Upper connecting plate; 52. Lower connecting plate; 53. Flexible connecting cover; 6. Arch breaking component; 61. Arch breaking part; 62. Flow guiding part; 63. Transition part; 71. Air inlet pipe; 72. Air outlet pipe. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] Please see Figure 1 and Figure 2 The present invention provides a closed unloading system. A closed unloading system includes a discharge bin 1, an electromagnetic ash unloader 2, and a weighing device 3 arranged sequentially along the discharge direction.

[0023] It should be noted that both the discharge hopper 1 and the weighing device 3 are supported and fixed by an external frame structure. The electromagnetic ash unloader 2 is connected by a suspension structure installed on the discharge hopper 1, so that the electromagnetic ash unloader 2 hangs below the discharge hopper 1. The discharge hopper 1, the electromagnetic ash unloader 2, and the weighing device 3 are not rigidly connected. When the electromagnetic ash unloader 2 is running, it can move relative to the discharge hopper 1 and the weighing device 3 to a certain extent without rigid collision.

[0024] The weighing device 3 includes a chassis, which houses all functional units. A weighing hopper is mounted on the chassis, and a pneumatic or hydraulic unloading sealing door is installed at the hopper's outlet. Both the electromagnetic ash unloader 2 and the weighing device 3 are existing technologies and will not be described in detail here.

[0025] Please see Figure 1 , Figure 2 and Figure 3 A closed unloading system further includes two protective structures 4. One protective structure 4 is located between the discharge hopper 1 and the electromagnetic ash unloader 2, and the other protective structure 4 is located between the electromagnetic ash unloader 2 and the weighing device 3. Each protective structure 4 is surrounded by a sealing structure 5.

[0026] Each protective structure 4 includes an upper protective plate 41 and a lower protective plate 42. The upper protective plate 41 is fixedly installed at the discharge end of the discharge hopper 1 or the discharge end of the electromagnetic ash discharger 2. The upper protective plate 41 has an annular space. The lower protective plate 42 is fixedly installed at the feed end of the electromagnetic ash discharger 2 or the feed end of the weighing device 3, with one end extending into the annular space. The upper protective plate 41 and the lower protective plate 42 combine to form an annular structure to prevent material from contacting the sealing structure 5.

[0027] It should be noted that the upper guard plate 41 at the discharge end of the discharge hopper 1 corresponds to the lower guard plate 42 at the feed end of the electromagnetic ash unloader 2, and the upper guard plate 41 at the discharge end of the electromagnetic ash unloader 2 corresponds to the lower guard plate 42 at the feed end of the weighing device 3.

[0028] After being discharged from the outlet of the discharge hopper 1, the lime enters the electromagnetic ash unloader 2 and the weighing device 3 sequentially along the discharge direction. Since the upper guard plate 41 and the lower guard plate 42 form a ring structure, the falling lime material, when passing through the joints of the devices, will first impact and rub against the overlapping upper guard plate 41 and lower guard plate 42. The sealing structure 5, located outside the protective structure 4, is isolated from the impact range of the material. This allows the protective structure 4 to bear the main responsibility for the impact and friction of the material, preventing the sealing structure 5 from directly contacting the material. This significantly reduces the wear of the sealing structure 5, extending its service life and maintaining a good sealing effect for a long time, effectively suppressing dust escape during the unloading process.

[0029] In some possible embodiments, please refer to Figure 3 The upper guard plate 41 includes a first annular vertical plate 411, a second annular vertical plate 412, and a connecting horizontal plate 413. The second annular vertical plate 412 is located inside the first annular vertical plate 411, and forms an annular space between the second and first annular vertical plates 411 to accommodate the corresponding lower guard plate 42. The connecting horizontal plate 413 is used to connect the first annular vertical plate 411 and the second annular vertical plate 412.

[0030] The lower guard plate 42 can be inserted into the annular space to form a double-layered, enveloping protection. When the lime material falls and impacts, the first annular vertical plate 411 blocks the material, preventing it from spreading towards the sealing structure 5. The second annular vertical plate 412 limits the overflow range of the material, preventing it from bypassing the lower guard plate 42 from the inside, thus forming uniform protection, reducing blind spots, and improving the reliability of the sealing protection of the entire unloading system.

[0031] In some possible embodiments, please refer to Figure 3 The first annular vertical plate 411, the second annular vertical plate 412, and the connecting horizontal plate 413 all have movable gaps with the corresponding lower guard plate 42.

[0032] In actual operation, the electromagnetic ash discharger 2 generates continuous vibration, which is transmitted to the upper guard plate 41 and lower guard plate 42 connected to it. Simultaneously, the discharge hopper 1 and weighing device 3 may also experience slight vibrations due to the impact of falling material, causing minor displacement of the upper guard plate 41 and lower guard plate 42. The adjustable clearance allows relative movement between the upper guard plate 41 and lower guard plate 42, preventing damage such as collision, wear, or even breakage caused by rigid contact during vibration.

[0033] When the electromagnetic ash unloader 2 vibrates, causing the upper guard plate 41 and lower guard plate 42 to vibrate laterally, the movable gap provides a certain vibration space between the corresponding upper guard plate 41 and lower guard plate 42, preventing hard friction between them and thus protecting the structural integrity of the corresponding upper guard plate 41 and lower guard plate 42. Simultaneously, the size of the movable gap can be set without affecting the material blocking effect, ensuring that even with relative movement, the overlapping area of ​​the corresponding upper guard plate 41 and lower guard plate 42 can still effectively block materials, preventing material leakage due to the movable gap. This allows the protective structure 4 to continuously provide reliable protection while adapting to equipment vibration, extending the service life of the protective structure 4 and reducing equipment maintenance costs.

[0034] In some possible embodiments, please refer to Figure 3 The lower guard plate 42 is connected to the feed end of the electromagnetic ash unloader 2 or the feed end of the weighing device 3 via the extension horizontal plate 421. The extension horizontal plate 421 is provided with a material leakage hole 4211.

[0035] During the operation of the unloading system, although the overlapping structure of the upper guard plate 41 and the lower guard plate 42 can block most of the material, a small amount of fine lime material may still enter the gap formed by the lower guard plate 42, the extension cross plate 421, and the sealing structure 5 through the movable gap between the upper guard plate 41 and the lower guard plate 42. If this material accumulates in the gap for a long time, it will gradually fill the gap, causing friction between the material and the sealing structure 5, thereby aggravating the wear of the sealing structure 5 and posing a risk of dust leakage. The setting of the leakage hole 4211 allows the small amount of material entering the gap to fall through the hole into the electromagnetic ash unloader 2 or the weighing device 3 below, and enter the normal unloading process, avoiding the accumulation of material in the gap and improving the stability and reliability of the unloading system.

[0036] In some possible embodiments, please refer to Figure 3 Each sealing structure 5 includes an upper connecting plate 51, a lower connecting plate 52, and a flexible connecting cover 53. The upper connecting plate 51 is detachably mounted at the discharge end of the discharge hopper 1 or the discharge end of the electromagnetic ash discharger 2. The lower connecting plate 52 is detachably mounted at the feed end of the electromagnetic ash discharger 2 or the feed end of the weighing device 3. The flexible connecting cover 53 connects the upper connecting plate 51 and the corresponding lower connecting plate 52.

[0037] It should be noted that the upper connecting plate 51 at the discharge end of the discharge hopper 1 corresponds to the lower connecting plate 52 at the feed end of the electromagnetic ash unloader 2, and the upper connecting plate 51 at the discharge end of the electromagnetic ash unloader 2 corresponds to the lower connecting plate 52 at the feed end of the weighing device 3.

[0038] For example, the upper connecting plate 51 and the lower connecting plate 52 are detachably connected by bolts and nuts. The flexible connection cover 53 is made of double-layer fiberglass material, which is resistant to high temperature and wear, and has better adaptability.

[0039] The flexible connecting cover 53 has a certain degree of flexibility, which can adapt to vibration and slight displacement during equipment operation, ensuring that the sealing connection between various devices is not damaged and effectively suppressing dust escape. The design of the detachable upper connecting plate 51 and lower connecting plate 52 makes the replacement and maintenance of the flexible connecting cover 53 more convenient. When the flexible connecting cover 53 needs to be replaced due to aging or damage after long-term use, it is not necessary to disassemble the main equipment such as the discharge hopper 1, electromagnetic ash unloader 2, or weighing device 3. Simply loosen the connecting bolts on the upper connecting plate 51 and lower connecting plate 52 to remove the old sealing structure 5 and install the new one, which greatly shortens the maintenance time and reduces the maintenance difficulty and cost.

[0040] Furthermore, based on the above embodiments, a corresponding protective structure 4 and a matching sealing structure 5 can also be provided between the weighing device 3 and the receiving chamber, which can be configured according to the actual situation.

[0041] In some possible embodiments, please refer to Figure 1 and Figure 2 The discharge bin 1 is a conical structure with a cross-section that gradually decreases along the discharge direction. An arch-breaking component 6 is provided inside the discharge bin 1. The arch-breaking component 6 has an arch-breaking end facing the feed end of the discharge bin 1 and a guide end facing the discharge end of the discharge bin 1.

[0042] After the lime material enters the conical discharge hopper 1, the gradually narrowing cross-section of the hopper exerts a certain degree of compression on the material, potentially causing bridging. Furthermore, the overall weight of the material within the hopper 1 is concentrated at the bottom discharge end, and this high degree of compression and wear leads to severe pulverization of the lime blocks. The anti-bridging component 6 can bear and disperse the downward pressure of the material within the discharge hopper 1. The anti-bridging end breaks up the bridging phenomenon, and the guide end directs the flow of the material, effectively dispersing the internal stress and reducing pulverization caused by mutual compression between materials. Simultaneously, mitigating pulverization reduces the amount of dust passing through the protective structure, thereby reducing dust wear on the sealing structure and significantly extending its service life.

[0043] In some possible embodiments, please refer to Figure 2The arch-breaking component 6 includes an arch-breaking section 61 and a flow-guiding section 62. The arch-breaking section 61 is connected to the inner wall of the discharge hopper 1 via a support leg. The arch-breaking section 61 is conical with its pointed end facing the feed end of the discharge hopper 1. The arch-breaking section 61 constitutes the arch-breaking end. The flow-guiding section 62 is connected to the bottom end of the arch-breaking section 61. The flow-guiding section 62 is conical with its pointed end facing the discharge end of the discharge hopper 1. The flow-guiding section 62 constitutes the flow-guiding end. A feeding channel is formed between the outer peripheral wall of the flow-guiding section 62 and the inner peripheral wall of the discharge hopper 1, guiding the material to fall. The feeding channel is annular.

[0044] When material enters from the feed end of discharge hopper 1, it first impacts the conical tip of the anti-bridging section 61. Due to the strong impact and dispersion effect of the conical structure, the agglomerated material is broken up, thereby reducing the occurrence of material bridging. The broken material continues to fall and enters the annular discharge channel formed by the outer peripheral wall of the guide section 62 and the inner peripheral wall of discharge hopper 1, thereby guiding the material and distributing it evenly within the annular channel. This prevents the material from concentrating in the center or edge of discharge hopper 1 and ensures that the material falls to the electromagnetic ash discharger 2 at a stable flow rate.

[0045] In some possible embodiments, please refer to Figure 2 The distance between the outer peripheral wall of the guide section 62 and the inner peripheral wall of the discharge bin 1 remains constant along the discharge direction.

[0046] When the material falls along the annular channel of uniform width, it can form a uniform material flow layer, without local accumulation or sudden changes in flow rate. This allows the electromagnetic ash unloader 2 to continuously and stably receive the material and uniformly transport it to the weighing device 3, thereby improving the stability and controllability of the entire unloading system.

[0047] In some possible embodiments, please refer to Figure 2 The arch-breaking component 6 also includes a transition section 63. The transition section 63 connects the arch-breaking component 61 and the guide section 62. The cross-section of the transition section 63 remains unchanged along the feeding direction.

[0048] The material needs to transition from the conical structure of the arch-breaking section 61 to the conical structure of the flow guiding section 62. If the two are directly connected, the cross-sectional shape at the connection point will change abruptly, which can easily lead to material accumulation at the connection point and affect the flow efficiency of the material. The transition section 63, on the other hand, can make the cross-sectional change gradual, so that the material can transition smoothly when passing through the transition section 63, avoiding eddies or accumulation caused by abrupt changes in cross-section.

[0049] Meanwhile, the transition section 63 can also enhance the overall structural strength of the arch-breaking component 6. Both the arch-breaking section 61 and the flow guide section 62 are conical structures, and the stress at the connection is relatively concentrated. The presence of the transition section 63 can disperse the stress and prevent the arch-breaking component 6 from being damaged by cracks or breaks at the connection when subjected to long-term material impact.

[0050] In some possible embodiments, please refer to Figure 2 The interior of the arch-breaking component 6 forms a closed cavity. The two sides of the arch-breaking component 6 are respectively connected to an air inlet pipe 71 and an air outlet pipe 72. Both the air inlet pipe 71 and the air outlet pipe 72 extend outward through the discharge bin 1. The air inlet pipe 71 is used to introduce cooling medium into the cavity, and the air outlet pipe 72 is used to discharge the cooling medium after heat exchange from the cavity.

[0051] During operation, the lime material is at a high temperature, which is transferred to the arch-breaking component 6, causing its temperature to rise. Prolonged exposure to high temperatures may degrade the material properties of the arch-breaking component 6, leading to deformation, reduced strength, and other problems, thus affecting its arch-breaking effect and service life. Simultaneously, the high-temperature material is also prone to agglomeration within the discharge hopper 1, increasing the difficulty of arch breaking.

[0052] The cooling medium is introduced into the closed cavity of the arch-breaking component 6 through the air inlet pipe 71, where it exchanges heat with the component 6, carrying away its heat. The medium is then discharged through the air outlet pipe 72, ensuring that the arch-breaking component 6 is always kept within a suitable temperature range. At the same time, the cooled arch-breaking component 6 can also cool down the surrounding high-temperature materials, reducing the possibility of material agglomeration due to high temperature and further improving the arch-breaking effect.

[0053] Both the air inlet pipe 71 and the air outlet pipe 72 extend outward through the discharge hopper 1, facilitating connection to an external cooling medium supply system. This enables the cooling medium to circulate and ensures continuous cooling, allowing the closed-loop unloading system to adapt to the unloading requirements of high-temperature materials. This expands the applicability of the equipment while protecting the arch-breaking component 6 and extending its service life. It also ensures that the unloading system can still operate stably under high-temperature conditions.

[0054] In summary, the closed-loop unloading system provided by this utility model, compared with the prior art, allows lime material to fall into the feed end of the electromagnetic ash unloader 2 after being discharged from the discharge end of the discharge bin 1. Since the discharge end of the discharge bin 1 is equipped with an upper guard plate 41, and the feed end of the electromagnetic ash unloader 2 is equipped with a lower guard plate 42, a continuous physical barrier is formed between the upper guard plate 41 and the lower guard plate 42. This ensures that the impact and friction of the falling material are mainly applied to the overlapping upper guard plate 41 and the lower guard plate 42, rather than directly to the surrounding sealing structure 5. This restricts the material's flow within the channel formed by the upper guard plate 41 and the lower guard plate 42, effectively preventing the material from contacting the sealing structure 5. Similarly, when the material is vibrated and conveyed by the electromagnetic ash unloader 2, the other upper guard plate 41 and the lower guard plate 42 at the feed end of the weighing device 3 prevent the material from contacting the sealing structure 5. This not only significantly reduces wear on the sealing structure 5 and extends its service life, but also maintains the system's airtightness and effectively prevents dust from escaping.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A closed unloading system, comprising a discharge hopper (1), an electromagnetic ash discharger (2), and a weighing device (3) arranged sequentially along the discharge direction, characterized in that, It also includes two protective structures (4), one of which is located between the discharge hopper (1) and the electromagnetic ash unloader (2), and the other is located between the electromagnetic ash unloader (2) and the weighing device (3); each of the protective structures (4) is provided with a sealing structure (5) around its periphery; Each of the aforementioned protective structures (4) includes: The upper guard plate (41) is fixedly installed at the discharge end of the discharge bin (1) or the discharge end of the electromagnetic ash unloader (2); the upper guard plate (41) has an annular space; The lower guard plate (42) is fixedly installed at the feed end of the electromagnetic ash unloader (2) or the feed end of the weighing device (3), and one end extends into the annular space; The upper guard plate (41) and the lower guard plate (42) are combined to form an annular structure to prevent material from contacting the sealing structure (5).

2. The closed unloading system as described in claim 1, characterized in that, The upper guard plate (41) includes: First annular vertical plate (411); The second annular vertical plate (412) is located inside the first annular vertical plate (411) and forms an annular space between it and the first annular vertical plate (411) for accommodating the corresponding lower guard plate (42); A connecting horizontal plate (413) is used to connect the first annular vertical plate (411) and the second annular vertical plate (412).

3. The closed unloading system as described in claim 2, characterized in that, The first annular vertical plate (411), the second annular vertical plate (412), and the connecting horizontal plate (413) all have movable gaps with the corresponding lower guard plate (42).

4. The closed unloading system as described in claim 1, characterized in that, The lower guard plate (42) is connected to the feed end of the electromagnetic ash unloader (2) or the feed end of the weighing device (3) via an extension horizontal plate (421), and a material leakage hole (4211) is provided on the extension horizontal plate (421).

5. A closed unloading system as described in claim 1, characterized in that, Each of the sealing structures (5) includes: The upper connecting plate (51) is detachably installed at the discharge end of the discharge bin (1) or the discharge end of the electromagnetic ash unloader (2); The lower connecting plate (52) is detachably installed at the feed end of the electromagnetic ash unloader (2) or the feed end of the weighing device (3); A flexible connector cover (53) is used to connect the upper connecting plate (51) and the corresponding lower connecting plate (52).

6. A closed unloading system as described in claim 1, characterized in that, The discharge bin (1) is a conical structure with a cross section that gradually decreases along the discharge direction. An arch-breaking component (6) is provided inside the discharge bin (1). The arch-breaking component (6) has an arch-breaking end facing the feed end of the discharge bin (1) and a guide end facing the discharge end of the discharge bin (1).

7. A closed unloading system as described in claim 6, characterized in that, The arch-breaking component (6) includes: The arch-breaking section (61) is connected to the inner wall of the discharge bin (1) via a support leg; the arch-breaking section (61) is conical with its tip facing the feed end of the discharge bin (1); the arch-breaking section (61) constitutes the arch-breaking end; A guide section (62) is connected to the bottom end of the arch-breaking section (61); the guide section (62) is conical with its tip pointing towards the discharge end of the discharge bin (1); the guide section (62) constitutes the guide end; The outer peripheral wall of the guide section (62) and the inner peripheral wall of the discharge bin (1) form a discharge channel to guide the material to fall, and the discharge channel is annular.

8. A closed unloading system as described in claim 7, characterized in that, The distance between the outer peripheral wall of the guide section (62) and the inner peripheral wall of the discharge bin (1) remains constant along the discharge direction.

9. A closed unloading system as described in claim 7, characterized in that, The arch-breaking component (6) also includes: A transition section (63) is connected between the arch-breaking section (61) and the flow guide section (62); the cross section of the transition section (63) remains unchanged along the feeding direction.

10. A closed unloading system as described in claim 6, characterized in that, The interior of the arch-breaking component (6) forms a closed cavity. An air inlet pipe (71) and an air outlet pipe (72) are respectively connected to both sides of the arch-breaking component (6). Both the air inlet pipe (71) and the air outlet pipe (72) extend outward through the discharge bin (1). The air inlet pipe (71) is used to introduce cooling medium into the cavity, and the air outlet pipe (72) is used to discharge the cooling medium after heat exchange from the cavity.

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