A multi-stage plow unloader and belt conveyor therefor

Abstract

The application discloses a multi-stage plough unloader and a belt conveyor thereof, and belongs to the technical field of belt conveyors. The multi-stage plough unloader comprises a rack part, an electric push rod, a residue unloading plough part and a floating frame. The residue unloading plough part comprises a first residue cleaner, a second residue cleaner and a third residue cleaner arranged in sequence along the direction of the belt travel, and the three are connected with the output end of the electric push rod and synchronously lifted under the drive of the electric push rod. A plurality of supporting rollers are arranged on the floating frame. The floating frame is connected with the residue unloading plough part through a lifting joint part. The residue unloading plough part is lifted to drive the floating frame to synchronously lift through the lifting joint part. The third residue cleaner is installed on the plough head frame of the residue unloading plough part through an elastic floating mechanism. The application can realize efficient and high-purity unloading, and solve the technical problems that the existing technology cannot unload dirty materials and is easy to be blocked.

Description

Technical Field

[0001] This application belongs to the field of belt conveyor unloading technology, and specifically relates to a multi-stage plow-type unloader and its belt conveyor. Background Technology

[0002] The plow-type unloader is a widely used unloading device in bulk material conveying systems in mining, metallurgy, power, and chemical industries. It is typically installed in the middle of a belt conveyor to achieve fixed-point unloading. Its basic working principle is as follows: a drive unit raises and lowers the plow head, with the lower edge of the plow head contacting the conveyor belt surface, guiding the material on the conveyor belt along both sides of the plow head into the unloading hopper. Existing plow-type unloaders generally employ variable trough angle idler rollers. In the working state, the idler rollers change from a trough shape to a flat shape to flatten the conveyor belt; in the non-working state, they return to the trough shape to allow material passage.

[0003] However, existing plow-type unloaders still have significant technical shortcomings when handling materials that are high-temperature, high-humidity, high-hardness, angular, and prone to clumping (such as coal slag and ore). On the one hand, existing plow heads mostly adopt a single, integral structure, lacking the ability to pre-treat large, clumped materials. When encountering large or clumped slag, they are prone to jamming, leading to poor unloading and even damage to the conveyor belt. At the same time, cleaning plows are mostly fixed in installation, making it difficult to achieve precise dynamic contact with the conveyor belt surface. After long-term use, the cleaning effect decreases significantly, and residual fine slag can scratch the conveyor belt or cause deviation. On the other hand, the linkage between the lifting and lowering action of the plow head and the troughing action of the idler roller group is not precise enough, often resulting in timing deviations, leading to material leakage or excessive local wear of the conveyor belt.

[0004] To address the aforementioned issues, it is necessary to provide a multi-stage plow-type unloader and its belt conveyor that can achieve efficient and clean unloading, thereby solving the technical problems of incomplete unloading, easy jamming, poor wear resistance, and insufficient coordination of existing technologies when handling harsh materials. Summary of the Invention

[0005] The purpose of this application is to provide a multi-stage plow-type unloader and its belt conveyor. This addresses the technical problems mentioned in the background art regarding existing plow-type unloaders, such as incomplete unloading, easy jamming, poor wear resistance, and insufficient coordination when handling materials with high temperature, high humidity, high hardness, and easy agglomeration.

[0006] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, a multi-stage plow-type unloader is provided, comprising a frame, an electric push rod, a slag unloading plow, and a floating frame. The frame is fixedly installed on the intermediate frame of a belt conveyor. The electric push rod is disposed on the frame. The slag unloading plow includes a first slag cleaner, a second slag cleaner, and a third slag cleaner arranged sequentially along the conveyor belt travel direction. The first slag cleaner, the second slag cleaner, and the third slag cleaner are respectively connected to the output end of the electric push rod and move up and down synchronously under the drive of the electric push rod. The floating frame is equipped with several rollers. The floating frame is connected to the slag discharge plow part through a lifting and lowering part. When the slag discharge plow part is raised and lowered, the floating frame is raised and lowered synchronously through the lifting and lowering part. The third slag cleaner is mounted on the plow head frame of the slag discharge plow section via an elastic floating mechanism. The elastic floating mechanism applies an elastic biasing force toward the conveyor belt surface to the third slag cleaner, so that the lower end of the third slag cleaner always remains in contact with the conveyor belt surface.

[0007] In one possible implementation, the first slag remover is a pre-unloading plow, which has a split multi-block structure with gaps between the blocks. The gap between the lower end of the pre-unloading plow and the conveyor belt surface is greater than the gaps between the second and third slag removers and the conveyor belt surface.

[0008] In one possible implementation, the second slag remover is a main unloading plow, which has an integral V-shaped structure and a guide tail fin at the unloading end of the main unloading plow.

[0009] In one possible implementation, the third slag remover is a sweeping plow, the plow head material of the sweeping plow is tungsten carbide, the elastic floating mechanism includes a screw and a compression spring, the sweeping plow is movably mounted on the plow head frame via the screw, and the compression spring is sleeved on the screw and presses against the sweeping plow and the plow head frame.

[0010] In one possible implementation, the first slag remover is made of wear-resistant stainless steel, and the second slag remover is made of chromium tricarbide wear-resistant steel plate.

[0011] In one possible implementation, an automatic trough corner roller is also included, which is symmetrically arranged on the front and rear sides of the floating frame. The inner end of the automatic trough corner roller is rotatably mounted on the floating frame, and an angle adjustment mechanism is provided between the outer end and the frame portion.

[0012] In one possible implementation, the angle adjustment mechanism includes a push rod seat fixedly mounted on the frame portion, the outer end of the automatic grooving corner roller is supported on the push rod seat, when the floating frame rises, the outer end of the automatic grooving corner roller disengages from the push rod seat and falls back flat under its own weight, when the floating frame descends, the outer end of the automatic grooving corner roller abuts against the push rod seat and is lifted into a grooving corner state.

[0013] In one possible implementation, the lifting assembly includes an adjustable link, one end of which is hinged to the end of the slag discharge plow assembly, and the other end is hinged to the floating frame.

[0014] In one possible implementation, one end of the electric push rod is hinged to the frame portion, and the other end is hinged to the middle of the slag discharge plow portion; the frame portion is also provided with a limiting screw, which is located below the end of the slag discharge plow portion to limit the falling stroke of the slag discharge plow portion.

[0015] In a second aspect, a belt conveyor is provided, including a conveyor belt and an intermediate frame disposed below the conveyor belt, and further including a multi-stage plow-type unloader as described in any of the preceding claims, wherein the multi-stage plow-type unloader is fixedly mounted on the intermediate frame via a frame portion.

[0016] Compared with the prior art, this application has the following beneficial effects: This application provides a multi-stage plow-type unloader, which, by setting a first, second, and third slag cleaner arranged sequentially along the conveyor belt travel direction, realizes a graded unloading process of pre-crushing, main unloading, and fine cleaning of large clumps of material. The mechanical linkage between the unloading plow and the floating frame is realized through the lifting and lowering mechanism, ensuring that the timing of the plow head lifting and the troughing action of the idler roller group is synchronized, avoiding material leakage or interference caused by action lag. The third slag cleaner is installed on the plow head frame through an elastic floating mechanism, which can automatically compensate for wear and always maintain close contact with the conveyor belt surface, significantly improving the unloading cleanliness. It solves the technical problems of incomplete unloading, easy jamming, poor wear resistance, and insufficient action coordination in the prior art when handling harsh materials.

[0017] In one possible implementation, the first slag remover adopts a split multi-piece structure with gaps, and the gap between its lower end and the conveyor belt surface is larger than that of the second and third slag removers. This allows for the pre-crushing and diversion of large clumps of material, effectively preventing large pieces of material from blocking subsequent slag removers. At the same time, it avoids the first slag remover from directly rubbing against the conveyor belt, thus extending the service life of the conveyor belt.

[0018] In one possible implementation, the second slag remover is an integral V-shaped structure with a guide tail fin. The V-shaped structure helps to smoothly guide the material to both sides, and the guide tail fin can guide the material to flow in a predetermined direction, preventing the material from accumulating or splashing at the discharge end, thus achieving an efficient and stable main discharge process.

[0019] In one possible implementation, the third slag remover uses tungsten carbide as the plow head material. Tungsten carbide has extremely high hardness and wear resistance, making it suitable for fine cleaning conditions. The elastic floating mechanism adopts a screw and compression spring combination structure. When the lower end of the cleaning plow wears due to long-term use, the entire cleaning plow slides downward along the screw axis under the action of the compression spring, automatically compensating for the wear and ensuring that the lower end of the cleaning plow always maintains close contact with the conveyor belt surface, achieving a long-term stable fine cleaning effect.

[0020] In one possible implementation, the first slag cleaner is made of wear-resistant stainless steel, the second slag cleaner is made of chromium tricarbide wear-resistant plate, and the third slag cleaner is made of tungsten carbide. Different slag cleaners are selected with appropriate wear-resistant materials according to their functional requirements, which not only ensures the wear resistance of each slag cleaner under its own working conditions, but also takes into account the economy of the overall manufacturing cost.

[0021] In one possible implementation, an angle adjustment mechanism is formed by setting up an automatic trough corner idler roller in conjunction with a push rod seat. When the floating frame rises, the outer end of the automatic trough corner idler roller disengages from the push rod seat and falls back flat under its own weight, changing the conveyor belt from a trough shape to a straight state. When the floating frame descends, the outer end of the automatic trough corner idler roller abuts against the push rod seat and is lifted into a trough corner state. This angle adjustment mechanism has a simple structure and can reliably switch the conveyor belt shape without an additional power source.

[0022] In one possible implementation, the lifting mechanism employs an adjustable linkage structure, with one end hinged to the end of the slag discharge plow and the other end hinged to the floating frame. The length of the adjustable linkage can be adjusted according to actual installation needs, ensuring precise timing matching between the slag discharge plow and the floating frame, thus improving the equipment's installation adaptability and operational reliability. In one possible implementation, one end of the electric push rod is hinged to the frame and the other end is hinged to the middle of the slag discharge plow section, ensuring that the electric push rod drives the slag discharge plow section smoothly; the limiting screw set on the frame is located below the end of the slag discharge plow section, which can limit the falling stroke of the slag discharge plow section and effectively prevent the slag discharge plow section from falling excessively and damaging the conveyor belt due to malfunction or failure of the electric push rod.

[0023] The belt conveyor provided in this application, by adopting the above-mentioned multi-stage plow-type unloader, can achieve graded unloading during the material conveying process, which significantly improves unloading efficiency, unloading cleanliness and overall machine operation reliability. It is suitable for harsh working conditions such as conveying high temperature, high humidity, high hardness, multi-angled and easily agglomerated materials in mining, metallurgy, power, chemical and other industries. Attached Figure Description

[0024] Figure 1 A schematic diagram of the overall structure of a multi-stage plow-type unloader provided in this application; Figure 2 A front view of a multi-stage plow-type unloader provided in this application; Figure 3 Another perspective schematic diagram of a multi-stage plow-type unloader provided in this application; Figure 4 A top view of a multi-stage plow-type unloader provided in this application; Figure 5 This application provides a schematic diagram of the slag discharge plow section of a multi-stage plow-type unloader.

[0025] The attached diagram is labeled as follows: 1. Automatic trough corner roller; 2. Frame section; 3. Push rod seat; 4. Electric push rod; 5. Slag discharge plow section; 51. First slag cleaner; 52. Second slag cleaner; 53. Third slag cleaner; 6. Lifting and lowering section; 7. Floating frame; 8. Roller; 9. Funnel section; 10. Dust cover; 11. Fastening connector; 12. Electrical control section. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] like Figures 1-5 As shown, this application discloses a multi-stage plow-type unloader, comprising a frame section 2, an electric push rod 4, a slag discharge plow section 5, and a floating frame 7. The frame section 2 is fixedly installed on the intermediate frame of the belt conveyor, serving as the mounting base for the entire unloader. The electric push rod 4 is mounted on the frame section 2; specifically, one end of the electric push rod 4 is hinged to the frame section 2, and the other end is hinged to the middle of the slag discharge plow section 5. The electric push rod 4 serves as a drive device, used to drive the slag discharge plow section 5 to rise and fall.

[0033] In this embodiment, the slag discharge plow section 5 includes a first slag cleaner 51, a second slag cleaner 52, and a third slag cleaner 53 arranged sequentially along the conveyor belt travel direction. The first slag cleaner 51, the second slag cleaner 52, and the third slag cleaner 53 are respectively connected to the output end of an electric push rod 4 and rise and fall synchronously under the drive of the electric push rod 4. The first slag cleaner 51, the second slag cleaner 52, and the third slag cleaner 53 are all fixedly installed on the plow head frame of the slag discharge plow section 5 and rise and fall together with the plow head frame.

[0034] In one possible embodiment, the first slag remover 51 is a pre-discharge plow, employing a split, multi-section structure with gaps between the sections. The gap between the lower end of the first slag remover 51 and the conveyor belt surface is greater than the gaps between the second slag remover 52 and the third slag remover 53 and the conveyor belt surface. Specifically, the gap between the lower end of the first slag remover 51 and the conveyor belt surface is 10mm to 30mm, the gap between the lower end of the second slag remover 52 and the conveyor belt surface is 0mm to 5mm, and the gap between the lower end of the third slag remover 53 and the conveyor belt surface is 0mm. The first slag remover 51 is made of wear-resistant stainless steel (such as 304 or 316L stainless steel), and its function is to first contact the material on the conveyor belt during the unloading process, pre-crushing large-diameter agglomerated slag lumps and guiding them to the unloading funnel, preventing large slag lumps from blocking subsequent slag removers. The split, multi-section structure allows each section to operate independently, and when encountering large, hard materials, relative displacement can occur, avoiding rigid jamming.

[0035] In this embodiment, the second slag remover 52 is the main unloading plow, which is an integral V-shaped structure. The tip of the V-shape faces the direction of the conveyor belt's travel, and both sides extend towards the unloading hopper. The unloading end of the second slag remover 52 is equipped with a guide tail fin, which guides the material to flow in a predetermined direction, preventing material accumulation or splashing at the unloading end. The second slag remover 52 is made of chromium tricarbide wear-resistant steel plate, which has excellent wear resistance and is suitable for continuous unloading of high-hardness materials. The function of the second slag remover 52 is to efficiently and smoothly unload approximately 95% of the slag-like material on the conveyor belt into the unloading hopper.

[0036] In this embodiment, the third slag remover 53 is a sweeping plow, which is mounted on the plow head frame of the slag unloading plow section 5 via an elastic floating mechanism. The elastic floating mechanism includes a screw and a compression spring. The sweeping plow is movably mounted on the plow head frame via the screw, and the compression spring is sleeved on the screw and presses against the sweeping plow and the plow head frame. Specifically, as shown... Figure 4As shown, the screw passes through the through hole on the plow head frame and the mounting hole on the sweeping plow. One end of the screw is equipped with a limiter to prevent the sweeping plow from falling off, and the other end is fixed to the plow head frame by a nut. A compression spring is sleeved on the screw, with one end abutting against the lower surface of the plow head frame and the other end abutting against the upper surface of the sweeping plow, applying an elastic biasing force towards the conveyor belt surface to the sweeping plow. The plow head material of the third slag remover 53 is tungsten carbide, which has extremely high hardness and wear resistance, making it suitable for fine cleaning conditions. Under the elastic biasing force of the compression spring, the lower end of the sweeping plow always remains in contact with the conveyor belt surface. When the lower end of the sweeping plow wears due to long-term use, under the action of the compression spring, the entire sweeping plow slides downward along the screw axis, automatically compensating for the wear, so that the lower end of the sweeping plow always maintains close contact with the conveyor belt surface, achieving continuous and thorough fine cleaning.

[0037] In this embodiment, the floating frame 7 is equipped with several idler rollers 8. The floating frame 7 is connected to the slag discharge plow section 5 via a lifting and lowering part 6. When the slag discharge plow section 5 is raised and lowered, the floating frame 7 is driven to rise and fall synchronously via the lifting and lowering part 6. The lifting and lowering part 6 includes an adjustable connecting rod, one end of which is hinged to the end of the slag discharge plow section 5, and the other end is hinged to the floating frame 7. The length of the adjustable connecting rod can be adjusted according to actual installation needs to ensure precise timing matching between the slag discharge plow section 5 and the floating frame 7. When the electric push rod 4 pushes the slag discharge plow section 5 to descend, the end of the slag discharge plow section 5 pulls the floating frame 7 to rotate around the connecting support plate and rise upward via the adjustable connecting rod; when the electric push rod 4 drives the slag discharge plow section 5 to rise, the floating frame 7 falls back under its own weight.

[0038] In one possible embodiment, the multi-stage plow-type unloader further includes an automatic trough corner idler 1. The automatic trough corner idler 1 is symmetrically arranged on the front and rear sides of the floating frame 7. The inner end of the automatic trough corner idler 1 is rotatably mounted on the floating frame 7 via a pin, and an angle adjustment mechanism is provided between the outer end and the frame portion 2. The angle adjustment mechanism includes a push rod seat 3 fixedly mounted on the frame portion 2. The outer end of the automatic trough corner idler 1 is supported on the push rod seat 3. When the floating frame 7 rises, the outer end of the automatic trough corner idler 1 disengages from the push rod seat 3 and falls back flat under its own weight, causing the conveyor belt to change from a trough shape to a straight state; when the floating frame 7 descends, the outer end of the automatic trough corner idler 1 abuts against the push rod seat 3 and is lifted into a trough corner state, causing the conveyor belt to return to a trough shape.

[0039] In this embodiment, a limiting screw is also provided on the frame portion 2. The limiting screw is located below the end of the slag discharge plow portion 5 to limit the descent stroke of the slag discharge plow portion 5 and prevent excessive descent of the slag discharge plow portion 5 from damaging the conveyor belt. The height of the limiting screw can be adjusted according to actual needs.

[0040] In one possible embodiment, the multi-stage plow discharger further includes a hopper section 9, a dust cover 10, and an electrical control section 12. The hopper section 9 is located below both sides of the discharge plow section 5, serving to receive the discharged material and guide it to downstream equipment. The dust cover 10 is positioned above the discharge plow section 5 to prevent dust from spreading during the discharge process. The electrical control section 12 is electrically connected to the electric push rod 4, controlling its extension and retraction to achieve remote or local control.

[0041] The frame section 2, electric push rod 4, slag discharge plow section 5, floating frame 7, funnel section 9, dust cover 10, and electrical control section 12 are all fixedly connected by fastening connectors 11. Fastening connectors 11 are used to achieve detachable fixed connections between components, and their specific forms include, but are not limited to, combinations of hexagonal bolts, nuts, and washers. By using fastening connectors 11, the reliability of the connections between components is ensured, and the installation, disassembly, and maintenance of the equipment are facilitated.

[0042] The working principle of the multi-stage plow-type unloader of this application is as follows: Non-working state (material feeding state): The electrical control unit 12 issues a command, the electric push rod 4 retracts, and drives the unloading plow section 5 to lift as a whole. The end of the unloading plow section 5 pushes the floating frame 7 downward and sinks through the lifting and lowering part 6. When the floating frame 7 descends, the outer end of the automatic trough corner idler roller 1 abuts against the push rod seat 3 and is lifted into a trough corner state. The idler roller 8 installed on the floating frame 7 sinks synchronously, the conveyor belt returns to the trough shape, and the material can pass through smoothly without obstruction.

[0043] Working state (unloading state): The electrical control unit 12 issues an unloading command, the electric push rod 4 extends, and pushes the unloading plow section 5 to descend as a whole. The end of the unloading plow section 5 pulls the floating frame 7 upward through the lifting and lowering unit 6. When the floating frame 7 rises, the outer end of the automatic trough corner roller 1 disengages from the push rod seat 3 and falls back flat under its own weight, changing the conveyor belt from a trough shape to a straight state and flattening the working surface of the conveyor belt. At the same time, the unloading plow section 5 falls in a set sequence: the first slag remover 51 first contacts the material on the conveyor belt, pre-crushing and unloading large-diameter clumps of slag into the funnel section 9; the second slag remover 52 then efficiently unloads most of the material on the conveyor belt into the funnel section 9; the third slag remover 53, under the elastic bias force of the compression spring, closely adheres to the conveyor belt surface to thoroughly clean and unload the remaining fine materials. After unloading is completed, the electric push rod 4 retracts again, driving all components to reset to the non-working state.

[0044] In one possible embodiment, since the third slag remover 53 is made of tungsten carbide and has an automatic compensation function for the compression spring, its service life is significantly extended, and it can maintain a precise fit with the conveyor belt surface for a long time, with a discharge cleanliness of over 99%.

[0045] In one possible embodiment, the split, multi-block structure of the first slag cleaner 51 allows the gaps between the blocks to accommodate materials of a certain particle size, preventing large pieces of material from causing rigid impacts to the first slag cleaner 51. Simultaneously, the large gap between the lower end of the first slag cleaner 51 and the conveyor belt surface prevents the first slag cleaner 51 from directly rubbing against the conveyor belt, thus extending the service life of the conveyor belt.

[0046] This application also provides a belt conveyor, including a conveyor belt and an intermediate frame disposed below the conveyor belt, and further including a multi-stage plow-type unloader as described in any of the preceding claims. The multi-stage plow-type unloader is fixedly mounted on the intermediate frame via the frame portion 2. During operation, the belt conveyor uses the multi-stage plow-type unloader to grade and unload the material carried on the conveyor belt, significantly improving unloading efficiency, unloading cleanliness, and operational reliability.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A multi-stage plow-type unloader, comprising a frame section (2), an electric push rod (4), a slag-discharging plow section (5), and a floating frame (7), wherein the frame section (2) is fixedly installed on the intermediate frame of a belt conveyor, and the electric push rod (4) is disposed on the frame section (2), characterized in that, The slag plow section (5) includes a first slag cleaner (51), a second slag cleaner (52) and a third slag cleaner (53) arranged sequentially along the conveyor belt travel direction. The first slag cleaner (51), the second slag cleaner (52) and the third slag cleaner (53) are respectively connected to the output end of the electric push rod (4) and rise and fall synchronously under the drive of the electric push rod (4). The floating frame (7) is provided with several rollers (8). The floating frame (7) is connected to the slag discharge plow (5) through the lifting and lowering part (6). When the slag discharge plow (5) is raised and lowered, the floating frame (7) is driven to rise and fall synchronously through the lifting and lowering part (6). The third slag cleaner (53) is mounted on the plow head frame of the slag discharge plow section (5) by means of an elastic floating mechanism. The elastic floating mechanism applies an elastic bias force toward the conveyor belt surface to the third slag cleaner (53), so that the lower end of the third slag cleaner (53) always remains in contact with the conveyor belt surface.

2. The multi-stage plow-type unloader according to claim 1, characterized in that, The first slag remover (51) is a pre-unloading plow. The pre-unloading plow adopts a split multi-block structure with gaps between each block. The gap between the lower end of the pre-unloading plow and the conveyor belt surface is greater than the gap between the second slag remover (52) and the third slag remover (53) and the conveyor belt surface.

3. The multi-stage plow-type unloader according to claim 1, characterized in that, The second slag remover (52) is the main unloading plow, which is an integral V-shaped structure, and the unloading end of the main unloading plow is provided with a guide tail fin.

4. The multi-stage plow-type unloader according to claim 1, characterized in that, The third slag remover (53) is a sweeping plow. The plow head material of the sweeping plow is tungsten carbide. The elastic floating mechanism includes a screw and a compression spring. The sweeping plow is movably installed on the plow head frame through the screw. The compression spring is sleeved on the screw and presses against the sweeping plow and the plow head frame.

5. The multi-stage plow-type unloader according to claim 1, characterized in that, The first slag remover (51) is made of wear-resistant stainless steel, and the second slag remover (52) is made of wear-resistant plate made of chromium tricarbide.

6. The multi-stage plow-type unloader according to claim 1, characterized in that, It also includes an automatic trough corner roller (1), which is symmetrically arranged on the front and rear sides of the floating frame (7). The inner end of the automatic trough corner roller (1) is rotatably mounted on the floating frame (7), and an angle adjustment mechanism is provided between the outer end and the frame part (2).

7. The multi-stage plow-type unloader according to claim 6, characterized in that, The angle adjustment mechanism includes a push rod seat (3) fixedly mounted on the frame part (2). The outer end of the automatic trough corner roller (1) is supported on the push rod seat (3). When the floating frame (7) rises, the outer end of the automatic trough corner roller (1) disengages from the push rod seat (3) and falls back flat under its own weight. When the floating frame (7) descends, the outer end of the automatic trough corner roller (1) abuts against the push rod seat (3) and is lifted into a trough corner state.

8. The multi-stage plow-type unloader according to claim 1, characterized in that, The lifting assembly (6) includes an adjustable connecting rod, one end of which is hinged to the end of the slag discharge plow assembly (5), and the other end is hinged to the floating frame (7).

9. The multi-stage plow-type unloader according to claim 1, characterized in that, One end of the electric push rod (4) is hinged to the frame part (2), and the other end is hinged to the middle of the slag discharge plow part (5); the frame part (2) is also provided with a limiting screw, which is located below the end of the slag discharge plow part (5) to limit the falling stroke of the slag discharge plow part (5).

10. A belt conveyor, comprising a conveyor belt and an intermediate frame disposed below the conveyor belt, characterized in that, It also includes a multi-stage plow unloader as described in any one of claims 1 to 9, wherein the multi-stage plow unloader is fixedly mounted on the intermediate frame via the frame portion (2).

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