A ladle sand filling device

Abstract

The application belongs to the technical field of ladle sand filling, in particular to a ladle sand filling device, which comprises a supporting platform, an expansion protection unit is arranged on the outer surface of the supporting platform, the expansion protection unit comprises a protection fence and an expansion platform, a sandstone lap joint sliding unit is fixedly installed on the inner surface of the protection fence, the sandstone lap joint sliding unit comprises a limiting sliding rail, and a non-slip lap joint discharge unit is slidably connected to the outer surface of the limiting sliding rail. The transmission wire rope is rotated by the transmission device, one end of the transmission wire rope is lowered, the receiving hopper at one end of the hinged clamping strip is extended downward, the bottom surface of the receiving hopper is matched with the top surface of the horn lap joint supporting table, the position is limited, the staff swings the sandstone bag in the sandstone accumulation table and lap joints the top surface of the swinging lifting plate, and the sealing property of the lifting flow isolation fence cylinder is improved.

Description

Technical Field

[0001] This invention belongs to the field of ladle sand filling technology, specifically a ladle sand filling device. Background Technology

[0002] Before use, the inside of the ladle nozzle must be filled with high-temperature resistant sand and gravel to prevent direct contact between the molten steel and the ladle slide plate. When the ladle filled with molten steel is hoisted to the continuous casting machine, the ladle slide plate opens, allowing the sand and gravel inside the ladle nozzle to fall freely, and the molten steel to flow down. To facilitate sand filling, we use a special sand filling mechanism, which allows sand to be easily poured into the ladle nozzle.

[0003] A Chinese patent with publication number CN204135329U discloses a ladle sand filling device, including a baking support, a baking oven set above the baking support, and a sand diversion chamber located above the baking oven. The bottom of the sand diversion chamber is provided with a baffle. The upper part of the baking oven is provided with a temperature display device and a diversion fan. A conveyor plate is fixedly inclined inside the baking oven. An electric heating wire is connected in series with a positive thermistor and a sliding rheostat. A funnel is provided below the end of the conveyor plate. A suspension rope is provided on the funnel. The suspension rope is connected to a steel wire rope. The steel wire rope is connected to a counterweight. The steel wire rope is set on two fixed pulleys.

[0004] Currently, in existing technologies, the filling of molten steel with sand and gravel involves workers carrying sand and gravel bags. When pouring the sand and gravel, workers need to bend forward, and since each bag is quite heavy, bending can be dangerous. Furthermore, when manually pouring the sand and gravel, it is impossible to completely guide it into the pipe, and some sand and gravel will still leak out, causing molten steel to splash.

[0005] Therefore, the present invention provides a steel ladle sand filling device. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A steel ladle sand filling device of the present invention includes a support platform. An extended protective unit is provided on the outer surface of the support platform. The extended protective unit includes a protective fence and an extended platform. A sand and gravel overlapping sliding unit is fixedly installed on the inner surface of the protective fence. The sand and gravel overlapping sliding unit includes a limiting sliding rail. An anti-slip overlapping discharge unit is slidably overlapped on the outer surface of the limiting sliding rail. The anti-slip overlapping discharge unit includes a swing lifting plate, anti-slip teeth, and a guide inclined plate. A support pull-out unit is fixedly connected to the top surface of the extended platform. The support pull-out unit includes a support column, a transmission device, and a transmission steel wire rope. A stacking and discharging discharge unit is fixedly connected to one end of the transmission steel wire rope. The stacking and discharging discharge unit includes a collection funnel and a discharge trough. An exhaust cooling unit is fixedly installed on the inner surface of the support platform. The exhaust cooling unit includes a blower and a high-speed exhaust pipe.

[0008] Preferably, a raised baffle tube is fixedly connected to the top right edge of the support platform. This allows employees to swing and overlap the sand bags inside the sand and gravel accumulation platform onto the top surface of the swinging lifting plate. The raised baffle tube's sealing properties help to block and prevent the upward flow of high-temperature hot air, thus avoiding burns or eye irritation from the hot air. A material drop groove is provided on the inner surface of the bottom surface of the raised baffle tube. A horn-shaped overlapping support platform is fixedly connected to the top center of the raised baffle tube, and the center of the horn-shaped overlapping support platform is aligned with the material drop groove.

[0009] Preferably, the outer surface of the limiting sliding track is fixedly connected to the inner surface of the protective fence. A slider is slidably overlapped on the top surface of the limiting sliding track. A sliding sleeve is fixedly connected to the outer surface of the slider. By pushing the sliding sleeve, the employee can make it slide on the top surface of the limiting sliding track, extending one end of the sliding sleeve to the top surface of the raised flow barrier cylinder. This allows the employee to open the sand bag, so that the sand inside slides out through the surface of the guide chute plate. An overlapping support plate is fixedly connected to the inner wall of the sliding sleeve at the left edge. A second material discharge slot is provided on the bottom right surface of the sliding sleeve.

[0010] Preferably, the guide chute plate is positioned on the inner wall of the sliding sleeve, one end of the swing lifting plate is swaying and sleeved on one end of the guide chute plate, and the bottom surface of the swing lifting plate movably overlaps the top surface of the overlapping support plate. The anti-slip teeth are set on the top surface of the swing lifting plate, and cooperate with the overlapping support plate to support and overlap the bottom surface of the swing lifting plate. The anti-slip teeth increase the friction between the swing lifting plate and the surface of the sand bag. A sliding overlapping closing plate is slidably overlapped on the inner top surface of the sliding sleeve.

[0011] Preferably, the bottom surface of the support column is fixedly connected to the top surface of the extension platform, the position of the transmission device is set at the outer top edge of the support column, the inner surface of the transmission wire rope is movably overlapped on the outer surface of the output end of the transmission device, a limit slider is fixedly connected to the outer surface of the support column, and a counterweight is fixedly connected to one end of the transmission wire rope.

[0012] Preferably, a hinged locking strip is fixedly connected to the other end of the transmission steel wire rope. One end of the hinged locking strip is fixedly connected to the inner surface of the top of the collection funnel. When the transmission device rotates the transmission steel wire rope, one end of the transmission steel wire rope slides down, thereby extending the collection funnel at one end of the hinged locking strip downwards. This allows the bottom surface of the collection funnel to fit against the top surface of the horn-shaped support platform, thus limiting its position and reducing the shaking of the discharge pipe when filling sand and gravel. The discharge trough is opened on the inner bottom surface of the collection funnel.

[0013] Preferably, a discharge pipe is fixedly connected to the bottom surface of the receiving funnel, and the outer surface of the discharge pipe is movably sleeved on the inner surface of the horn-shaped overlapping support platform and the raised flow-blocking fence cylinder.

[0014] Preferably, an L-shaped overlapping support plate is fixedly connected to the outer surface of the protective fence, and the blower is detachably installed on the inner surface of the L-shaped overlapping support plate on the outer surface of the blower. An air guide pipe is fixedly connected to the output end of the blower, thereby pulling the material drop pipe out from the inside of the molten steel. The blower, together with the air guide pipe, rapidly injects air into the inside of the air guide pipe, and guides the gas into the inside of the arc-shaped fitting shell. The high-speed exhaust pipe inside the arc-shaped fitting shell rapidly blows air onto the surface of the material drop pipe to cool it down, preventing employees from accidentally touching the material drop pipe and getting burned.

[0015] Preferably, an arc-shaped fitting shell is fixedly connected to the inner wall of the raised flow barrier cylinder, and a high-speed exhaust pipe is fixedly connected to the inner surface of the arc-shaped fitting shell. One end of the air guide pipe is connected to the surface of the arc-shaped fitting shell, and one end of the air guide pipe passes through the arc-shaped fitting shell and is connected to one end of the high-speed exhaust pipe.

[0016] Preferably, the bottom end of the protective fence is connected to the top two sides of the support platform, one end of the extended platform is connected to the left side of the support platform, and a sand and gravel accumulation platform is fixedly connected to the inner side of the extended platform.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The steel ladle sand filling device of the present invention, in conjunction with the transmission device, rotates the transmission steel wire rope, causing one end of the transmission steel wire rope to slide down, thereby extending the collection funnel on one end of the hinged clamping strip downward, so that the bottom surface of the collection funnel is attached to the top surface of the horn-shaped overlapping support platform, thus defining its position. In conjunction with the workers, the sand and gravel bags inside the sand and gravel accumulation platform are swung and overlapped on the top surface of the swing lifting plate, which in turn improves the sealing of the flow-blocking fence cylinder, blocking the upward flow of high-temperature hot air. The overlapping support plate supports and overlaps the bottom surface of the swing lifting plate, and the anti-slip teeth increase the friction between the sand and gravel bag surface.

[0019] 2. The steel ladle sand filling device of the present invention involves an employee pushing a sliding sleeve to slide on the top surface of a limiting sliding track, extending one end of the sliding sleeve to the top surface of a raised flow-blocking barrier cylinder. The employee then opens the sand bag, allowing the sand inside to slide out through the surface of the guide chute plate. The sand is then collected on the inner surface of the collecting funnel. The sand inside the collecting funnel is guided into the discharge pipe through a discharge chute, thus guiding the sand into the molten steel. During the pouring of the sand, a swinging lifting plate is used to swing and lift the device, discharging any remaining sand.

[0020] 3. The steel ladle sand filling device of the present invention, after filling with sand and gravel, rotates in conjunction with the transmission device, and then pulls the transmission steel wire rope by the gravity of the counterweight, thereby pulling the material drop pipe out from the inside of the molten steel. In conjunction with the blower, air is injected into the air guide pipe at high speed, and the air guide pipe guides the gas into the inside of the arc-shaped fitting shell. In conjunction with the high-speed exhaust pipe inside the arc-shaped fitting shell, the surface of the material drop pipe is quickly blown with air to cool it down, so as to prevent employees from accidentally touching the material drop pipe and getting burned. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a cross-sectional three-dimensional structural diagram of the support platform in this invention;

[0024] Figure 3 This is a schematic diagram of the lifting three-dimensional structure of the support platform in this invention;

[0025] Figure 4 This is a cross-sectional three-dimensional structural diagram of the sliding sleeve in this invention;

[0026] Figure 5 This is a three-dimensional cross-sectional view of the sliding sleeve lifting structure in this invention;

[0027] Figure 6 This is a cross-sectional three-dimensional structural diagram of the supporting column in this invention;

[0028] Figure 7 This is a cross-sectional three-dimensional structural diagram of the support platform and storage funnel in this invention;

[0029] Figure 8 This is a cross-sectional three-dimensional structural diagram of the supporting platform and the storage funnel in this invention.

[0030] Figure 9 This is a cross-sectional three-dimensional structural diagram of the L-shaped overlapping support plate in this invention.

[0031] In the diagram: 11. Support platform; 12. Protective fence; 13. Extension platform; 14. Elevated flow barrier cylinder; 15. Horn-shaped overlapping support platform; 16. Sand and gravel accumulation platform; 17. Support column; c1. Transmission device;

[0032] c2, transmission wire rope; c3, counterweight; c4, hinged connecting strip; c5, storage funnel; c6, material discharge chute one; c7, material discharge pipe; c8, limiting slide bar; 18, limiting sliding track; a1, sliding sleeve; a2, sliding overlap closing plate; a3, overlap support plate; a4, guide chute plate; a5, swing lifting plate; a6, anti-slip teeth; a7, material discharge chute two; 19, L-shaped overlap support plate; d1, blower; d2, air guide pipe; d3, arc-shaped fitting sleeve; d4, high-speed exhaust pipe. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] like Figures 1 to 9As shown, an embodiment of the present invention provides a steel ladle sand filling device, including a support platform 11. An extended protective unit is provided on the outer surface of the support platform 11. The extended protective unit includes a protective fence 12 and an extended platform 13. A sand and gravel overlapping sliding unit is fixedly installed on the inner surface of the protective fence 12. The sand and gravel overlapping sliding unit includes a limiting sliding rail 18. An anti-slip overlapping discharge unit is slidably overlapped on the outer surface of the limiting sliding rail 18. The anti-slip overlapping discharge unit includes a swing lifting plate a5, anti-slip teeth a6, and a guide inclined plate a4. A support pull-out unit is fixedly connected to the top surface of the extended platform 13. The support pull-out unit includes a support column 17, a transmission device c1, and a transmission steel wire rope c2. A stacking and discharging unit is fixedly connected to one end of the transmission wire rope c2. The stacking and discharging unit includes a collection funnel c5 and a discharge trough c6. An exhaust cooling unit is fixedly installed on the inner surface of the support platform 11. The exhaust cooling unit includes a blower d1 and a high-speed exhaust pipe d4. A raised baffle cylinder 14 is fixedly connected to the top right edge of the support platform 11. This allows employees to swing and overlap the sand bags inside the sand and gravel stacking platform 16 onto the top surface of the swinging lifting plate a5. The sealing of the raised baffle cylinder 14 blocks the upward flow of high-temperature hot air, preventing the hot air from burning or irritating the employees' eyes. The bottom surface and inner surface of the raised baffle cylinder 14 are also connected to the baffle cylinder. A material discharge chute is provided. A horn-shaped overlapping support platform 15 is fixedly connected to the top center of the raised baffle cylinder 14, and the center of the horn-shaped overlapping support platform 15 is in contact with the material discharge chute. The outer surface of the limiting sliding rail 18 is fixedly connected to the inner surface of the protective fence 12. A slider is slidably overlapped on the top surface of the limiting sliding rail 18. A sliding sleeve a1 is fixedly connected to the outer surface of the slider. An overlapping support plate a3 is fixedly connected to the inner wall of the sliding sleeve a1 at the left edge. A material discharge chute a7 is provided on the bottom right surface of the sliding sleeve a1. A guide chute plate a4 is located on the inner wall of the sliding sleeve a1. The sliding sleeve a1 is controlled by the employee. The casing a1 is pushed so that it slides on the top surface of the limiting sliding track 18, and one end of the sliding casing a1 extends to the top surface of the raised flow barrier cylinder 14. The employee opens the sand bag so that the sand inside slides out through the surface of the guide chute plate a4. One end of the swing lifting plate a5 swings and fits onto one end of the guide chute plate a4, and the bottom surface of the swing lifting plate a5 movably overlaps the top surface of the overlapping support plate a3. The anti-slip teeth a6 are set on the top surface of the swing lifting plate a5, and together with the overlapping support plate a3, they support and overlap the bottom surface of the swing lifting plate a5. The anti-slip teeth a6 increase the friction between the swing lifting plate a5 and the surface of the sand bag.

[0035] like Figures 1 to 9As shown, a sliding overlap closing plate a2 is slidably overlapped on the inner top surface of the sliding sleeve a1, and an L-shaped overlap support plate 19 is fixedly connected to the outer surface of the protective fence 12. The blower d1 is detachably mounted on the inner surface of the L-shaped overlap support plate 19 on the outer surface. A guide pipe d2 is fixedly connected to the output end of the blower d1, thereby pulling the discharge pipe c7 out from the inside of the molten steel. The blower d1, in conjunction with the air blower d1, rapidly injects air into the guide pipe d2, which then guides the gas into the interior of the arc-shaped fitting sleeve d3. The high-speed exhaust pipe d4 inside the arc-shaped fitting sleeve d3 then rapidly exhausts the surface of the discharge pipe c7. Air is blown to cool it down and prevent employees from accidentally touching the discharge pipe c7 and getting burned. An arc-shaped fitting shell d3 is fixedly connected to the inner wall of the raised baffle cylinder 14. A high-speed exhaust pipe d4 is fixedly connected to the inner surface of the arc-shaped fitting shell d3. One end of the air guide pipe d2 is connected to the surface of the arc-shaped fitting shell d3, and the other end of the air guide pipe d2 passes through the arc-shaped fitting shell d3 and connects to one end of the high-speed exhaust pipe d4. The bottom end of the protective fence 12 is connected to the top two sides of the support platform 11. One end of the extended platform 13 is connected to the left side of the support platform 11. A sand and gravel accumulation platform 16 is fixedly connected to the inner surface of the extended platform 13.

[0036] like Figures 1 to 9 As shown, the bottom surface of the support column 17 is fixedly connected to the top surface of the extension platform 13. The transmission device c1 is positioned at the outer top edge of the support column 17. The inner surface of the transmission wire rope c2 is movably overlapped on the outer surface of the output end of the transmission device c1. A limit slider c8 is fixedly connected to the outer surface of the support column 17. A counterweight c3 is fixedly connected to one end of the transmission wire rope c2. After the sand and gravel are filled, the transmission device c1 rotates, and the weight of the counterweight c3 pulls the transmission wire rope c2. A hinged clamping strip c4 is fixedly connected to the other end of the moving steel wire rope c2. One end of the hinged clamping strip c4 is fixedly connected to the top inner surface of the receiving funnel c5. In conjunction with the transmission device c1, the transmission steel wire rope c2 is rotated, causing one end of the transmission steel wire rope c2 to slide down, thereby extending the receiving funnel c5 at one end of the hinged clamping strip c4 downward. This causes the bottom surface of the receiving funnel c5 to fit against the top surface of the horn-shaped overlapping support platform 15, thus limiting its position and reducing the shaking of the material discharge pipe c7 when filling sand and gravel.

[0037] like Figures 1 to 9As shown, the discharge chute c6 is opened on the inner bottom surface of the receiving funnel c5. The discharge pipe c7 is fixedly connected to the bottom surface of the receiving funnel c5, and is used to collect the sand and gravel inside the receiving funnel c5. The discharge chute c6 guides the sand and gravel inside the receiving funnel c5 into the discharge pipe c7, so that the sand and gravel are guided into the molten steel. When dumping the sand and gravel, it is swung and lifted with the swing lifting plate a5 to discharge the remaining sand and gravel. The outer surface of the discharge pipe c7 is movably sleeved on the inner surface of the horn-shaped overlapping support platform 15 and the raised flow barrier cylinder 14.

[0038] Working principle: The transmission cable c2 is rotated by the transmission device c1, causing one end of the transmission cable c2 to slide down, thereby extending the collection funnel c5 on one end of the hinge clip c4 downward. This causes the bottom surface of the collection funnel c5 to fit against the top surface of the horn-shaped overlapping support platform 15, thus defining its position. This allows the workers to swing and overlap the sand bags inside the sand and gravel accumulation platform 16 onto the top surface of the swing lifting plate a5. This, combined with the improved sealing of the flow-blocking fence cylinder 14, blocks and prevents the upward flow of high-temperature hot air. The overlapping support plate a3 supports and overlaps the bottom surface of the swing lifting plate a5, and the anti-slip teeth a6 increase the friction between the anti-slip teeth and the surface of the sand and gravel bags.

[0039] The employee pushes the sliding sleeve a1 to slide it on the top surface of the limiting sliding track 18, extending one end of the sliding sleeve a1 to the top surface of the raised flow barrier cylinder 14. The employee opens the sand bag, allowing the sand inside to slide out through the surface of the guide chute plate a4. The sand is then collected on the inner surface of the collection funnel c5. The sand inside the collection funnel c5 is guided into the discharge pipe c7 through the discharge chute c6, allowing the sand to flow into the molten steel. When dumping the sand, the swing lifting plate a5 swings and lifts the sand to discharge any remaining sand.

[0040] The transmission device c1 rotates in conjunction with the counterweight c3, which pulls the transmission wire rope c2, thereby pulling the discharge pipe c7 out of the molten steel. The blower d1 injects air into the air guide pipe d2 at high speed, and the air guide pipe d2 guides the gas into the arc-shaped fitting shell d3. The high-speed exhaust pipe d4 inside the arc-shaped fitting shell d3 blows air quickly onto the surface of the discharge pipe c7 to cool it down and prevent employees from accidentally touching the discharge pipe c7 and getting burned.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ladle sand-filling device, characterized in that: The system includes a support platform (11), on the outer surface of which is an extended protective unit. The extended protective unit includes a protective fence (12) and an extended platform (13). A sand and gravel overlapping sliding unit is fixedly installed on the inner surface of the protective fence (12). The sand and gravel overlapping sliding unit includes a limiting sliding rail (18). An anti-slip overlapping discharge unit is slidably overlapped on the outer surface of the limiting sliding rail (18). The anti-slip overlapping discharge unit includes a swing lifting plate (a5), anti-slip teeth (a6), and a guide chute plate. (a4) A support pull-out unit is fixedly connected to the top surface of the extended platform (13). The support pull-out unit includes a support column (17), a transmission device (c1), and a transmission steel wire rope (c2). A stacking and discharging unit is fixedly connected to one end of the transmission steel wire rope (c2). The stacking and discharging unit includes a collection funnel (c5) and a discharge slot (c6). An exhaust cooling unit is fixedly installed on the inner surface of the support platform (11). The exhaust cooling unit includes a blower (d1) and a high-speed exhaust pipe (d4). The outer surface of the limiting sliding track (18) is fixedly connected to the inner surface of the protective fence (12). A slider is slidably overlapped on the top surface of the limiting sliding track (18). A sliding sleeve (a1) is fixedly connected to the outer surface of the slider. An overlapping support plate (a3) ​​is fixedly connected to the inner wall of the sliding sleeve (a1) at the left edge. A material discharge slot (a7) is provided on the bottom right surface of the sliding sleeve (a1). The guide chute plate (a4) is located on the inner wall of the sliding sleeve (a1). One end of the swing lifting plate (a5) is slidably sleeved on one end of the guide chute plate (a4). The bottom surface of the swing lifting plate (a5) is movably overlapped on the top surface of the overlapping support plate (a3). The anti-slip teeth (a6) are provided on the top surface of the swing lifting plate (a5). A sliding overlapping closing plate (a2) is slidably overlapped on the inner top surface of the sliding sleeve (a1). The bottom surface of the support column (17) is fixedly connected to the top surface of the extension platform (13). The transmission device (c1) is positioned at the outer top edge of the support column (17). The inner surface of the transmission wire rope (c2) is movably overlapped on the outer surface of the output end of the transmission device (c1). A limit strip (c8) is fixedly connected to the outer surface of the support column (17). A counterweight (c3) is fixedly connected to one end of the transmission wire rope (c2). A hinged snap-fit ​​strip (c4) is fixedly connected to the other end of the rope (c2). One end of the hinged snap-fit ​​strip (c4) is fixedly connected to the inner surface of the top of the receiving funnel (c5). The material discharge slot (c6) is opened on the bottom surface of the inner side of the receiving funnel (c5). A material discharge pipe (c7) is fixedly connected to the bottom surface of the receiving funnel (c5), and the outer surface of the material discharge pipe (c7) is movably sleeved on the inner surface of the horn-shaped overlapping support platform (15) and the raised flow-blocking fence cylinder (14). A duct (d2) is fixedly connected to the output end of the blower (d1). An arc-shaped fitting shell (d3) is fixedly connected to the inner wall of the raised baffle cylinder (14). A high-speed exhaust pipe (d4) is fixedly connected to the inner surface of the arc-shaped fitting shell (d3). One end of the duct (d2) is connected to the surface of the arc-shaped fitting shell (d3), and one end of the duct (d2) passes through the arc-shaped fitting shell (d3) and connects to one end of the high-speed exhaust pipe (d4).

2. The ladle sand-filling device according to claim 1, characterized in that: A raised flow barrier cylinder (14) is fixedly connected to the top right edge of the support platform (11). A material drop groove hole is opened on the inner surface of the bottom surface of the raised flow barrier cylinder (14). A horn-shaped overlapping support platform (15) is fixedly connected to the top middle position of the raised flow barrier cylinder (14), and the center position of the horn-shaped overlapping support platform (15) is in contact with the material drop groove hole.

3. The ladle sand-filling device according to claim 1, characterized in that: An L-shaped overlapping support plate (19) is fixedly connected to the outer surface of the protective fence (12), and the blower (d1) is detachably installed on the inner surface of the L-shaped overlapping support plate (19) on the outer surface.

4. The ladle sand-filling device according to claim 1, characterized in that: The bottom end of the protective fence (12) is connected to the top two sides of the support platform (11), one end of the extended platform (13) is connected to the left side of the support platform (11), and a sand and gravel accumulation platform (16) is fixedly connected to the inner side of the extended platform (13).

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