A coke heat recovery device in a coke oven

Abstract

This utility model relates to a coke heat recovery device inside a coke oven, belonging to the field of coke heat recovery technology. It includes two sets of support frames and two sets of water tanks. The two sets of support frames are respectively installed on the left and right sides of the coke oven elevator, and the two sets of water tanks correspond to the stopping positions of the two sets of coke ovens. A portal frame is fixedly connected to the upper end of the support frames. The two sets of water tanks are respectively fixedly connected to the lower end of the portal frame on the corresponding side via fixing frames. Steam branch pipes are connected to the upper ends of the two sets of water tanks, and the ends of the two steam branch pipes furthest from the water tanks are connected to the same main steam pipe. Water supply branch pipes are connected to the upper rear sides of the two sets of water tanks. This utility model utilizes the high temperature of the coke inside the coke oven to rapidly heat the water in the tanks and convert it into steam, which is then transported through the steam branch pipes. It effectively utilizes the waiting time between the two sets of coke ovens, converting the heat of the coke inside the coke oven into thermal energy, improving energy utilization efficiency and avoiding heat energy waste.

Description

Technical Field

[0001] This utility model relates to the field of coke heat recovery technology, and in particular to a coke heat recovery device inside a coke canister. Background Technology

[0002] In the coke production process, after the coke is pushed out of the coke oven outlet, it first falls into the coke cans located on the coke transport car. The coke transport car is usually equipped with two coke cans, operating in a cyclical mode: one coke can receives the coke at the coke oven outlet, while the other coke can transport the coke to the dry quenching furnace for unloading. These two coke cans are used alternately on the coke transport car, forming a continuous transport cycle.

[0003] When the coke transport car delivers coke cans filled with red-hot coke, the coke can elevator first places empty coke cans (for unloading coke into the dry quenching furnace) onto the transport car. Then, the transport car moves the full coke cans to the bottom of the coke can elevator, which then lifts the full coke cans back to the dry quenching furnace. Finally, the transport car transports the empty coke cans to the coke oven outlet to await coke reception, and this cycle repeats.

[0004] However, during coke transportation, when the coke transport car delivers coke cans filled with red-hot coke to the area below the dry quenching furnace, it must wait for the coke can elevator to first place the empty coke cans back onto the transport car before the full coke cans can be lifted. This switching between the two coke cans requires a certain waiting time, during which the top of the full coke can is completely open, and the coke inside is at approximately 1000 degrees Celsius. A significant amount of heat from the coke can is rapidly dissipated into the surrounding environment through the opening during this period, resulting in energy waste. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides a coke heat recovery device inside a coke oven. The technical solution of this utility model is as follows:

[0006] A coke heat recovery device for coke ovens includes two sets of support frames and two sets of water tanks. The two sets of support frames are respectively installed on the left and right sides of the coke oven elevator. The two sets of water tanks correspond to the stopping positions of the two sets of coke ovens. A portal frame is fixedly connected to the upper end of the support frame. The two sets of water tanks are respectively fixedly connected to the lower end of the portal frame on the corresponding side by a fixing frame. Steam branch pipes are respectively connected to the upper end of the two sets of water tanks. The ends of the two sets of steam branch pipes away from the water tanks are connected to the same main steam pipe. Water supply branch pipes are respectively connected to the upper rear side of the two sets of water tanks. The ends of the two sets of water supply branch pipes away from the water tanks are connected to the same main water supply pipe. Annular protective seats are slidably fitted on the outer side of the two sets of water tanks. Lifting components for driving their longitudinal lifting are connected to the outer side of the two sets of annular protective seats. A slag scraping component for scraping off the deposits on the bottom of the water tanks is connected to the support frame.

[0007] The water tank is used to hold water, and the water is heated by heat exchange with the high-temperature coke inside the coke pot.

[0008] Optionally, an annular scraper for scraping off the material adhering to the inner wall of the annular protective seat is also sandwiched between the water tank and the annular protective seat, and the annular scraper is fixedly sleeved on the lower outer side of the water tank.

[0009] Optionally, the annular scraper includes an annular plate and an annular scraper blade. The annular plate is fixedly sleeved on the outside of the water tank, and the annular scraper blade is fixedly connected to the lower end of the annular plate with an obtuse angle between them.

[0010] Optionally, the lifting assembly includes two sets of lifting telescopic rods and two sets of ear seats. The fixed ends of the two sets of lifting telescopic rods are respectively fixedly connected to the left and right sides of the door frame, and the two sets of ear seats are respectively fixedly connected to the left and right sides of the annular protective seat. The telescopic ends of the two sets of lifting telescopic rods are respectively fixedly connected to the two sets of ear seats.

[0011] Optionally, ear plates are fixedly connected to the front and rear sides of the annular protective seat, and support seats are symmetrically fixed to the front and rear sides of the upper end of the support frame. Longitudinal sliding rods are fixedly connected to the support seats, and the two sets of ear plates are slidably connected to the two sets of longitudinal sliding rods respectively.

[0012] Optionally, the slag scraping assembly includes a bottom scraper, which is slidably mounted on the upper end of a support frame, and a drive component is connected to the support frame to drive the bottom scraper to move along the bottom of the water tank.

[0013] Optionally, the driving component includes two sets of fixed seats, two sets of lead screws, and one set of motors. The two sets of fixed seats are respectively fixed on the upper left and right sides of the support frame. The two sets of lead screws are rotatably connected to the inside of the two sets of fixed seats. Nut seats are threaded on the outer side of the two sets of lead screws. L-shaped brackets are fixedly connected to the lower end of the two sets of nut seats. The two sets of L-shaped brackets are symmetrically arranged and are respectively fixedly connected to the left and right ends of the bottom scraper by bolts. The front end of the two sets of lead screws passes through the fixed seat on the corresponding side and is fixedly fitted with a sprocket. A synchronous chain is fitted on the outer side of the two sets of sprockets. The front end of one set of lead screws is fixedly connected to the output shaft of the motor. The motor is fixedly connected to one side of the support frame.

[0014] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.

[0015] The beneficial effects of this utility model through the above solution are as follows:

[0016] 1. This utility model involves installing two sets of water tanks on both sides of the coke oven elevator, with each set corresponding to a different location where a coke oven is stopped. When the coke transport car moves to the bottom of the dry quenching furnace, the coke oven filled with red-hot coke is positioned directly below the corresponding water tank. At this time, the high temperature of the coke inside the coke oven rapidly heats the water in the tank, converting it into steam, which is then transported via the steam branch pipe. This utility model effectively utilizes the waiting time between the two sets of coke ovens, converting heat energy through the heat of the coke inside the oven, thus improving energy utilization efficiency and avoiding heat energy waste.

[0017] 2. By setting up an annular protective seat, when the coke tank moves to the bottom of the water tank, the lifting component controls the annular protective seat to descend, thereby blocking and protecting the gap between the water tank and the coke tank, thus reducing the amount of heat loss and improving the heat conversion rate.

[0018] 3. By setting up a slag scraping component, when the coke tank moves away from below the water tank, the slag scraping component can scrape off the deposits on the bottom of the water tank, thereby improving the heating efficiency of the water tank.

[0019] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall appearance structure of the coke heat recovery device in the coke can provided by this utility model.

[0021] Figure 2 A front view of the coke heat recovery device in the coke can provided by this utility model in one of its working states;

[0022] Figure 3 A front view of the coke heat recovery device in the coke can provided by this utility model under another working state;

[0023] Figure 4 for Figure 2 Top view;

[0024] Figure 5 This is a bottom view of the support frame, water tank, annular protective seat, lifting assembly, annular scraper, and slag scraping assembly working together in this utility model.

[0025] Figure 6 This is an exploded structural diagram of the support frame, water tank, annular protective seat, lifting assembly, annular scraper, and slag scraping assembly in this utility model.

[0026] Figure 7 This is an exploded structural diagram of the support frame and the slag scraping assembly in this utility model;

[0027] Figure 8 This is a front sectional view of the water tank and the annular scraper in this utility model.

[0028] The following are the labeling elements in the diagram: 1. Support frame; 11. Portal frame; 2. Water tank; 21. Steam branch pipe; 22. Steam main pipe; 23. Water supply branch pipe; 24. Water supply main pipe; 3. Annular protective seat; 4. Lifting assembly; 41. Lifting telescopic rod; 42. Ear seat; 43. Ear plate; 44. Support seat; 45. Longitudinal slide bar; 5. Annular scraper; 51. Annular plate; 52. Annular scraper blade; 6. Slag scraping assembly; 61. Bottom scraper; 62. Drive component; 621. Fixed seat; 622. Lead screw; 623. Nut seat; 624. L-shaped bracket; 625. Sprocket; 626. Synchronous chain; 627. Motor; 100. Coke tank. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0030] Please see Figure 1-8 This utility model provides a coke heat recovery device in a coke tank, including two sets of support frames 1 and two sets of water tanks 2. The two sets of support frames 1 are respectively installed on the left and right sides of the coke tank elevator. The two sets of water tanks 2 correspond to the stopping positions of the two sets of coke tanks 100. A gate frame 11 is fixedly connected to the upper end of the support frame 1. The two sets of water tanks 2 are respectively fixedly connected to the lower end of the gate frame 11 on the corresponding side by a fixing frame. Steam branch pipes 21 are respectively connected to the upper end of the two sets of water tanks 2. The ends of the two sets of steam branch pipes 21 away from the water tanks 2 are connected to the same steam main pipe 22. Water supply branch pipes 23 are respectively connected to the upper rear side of the two sets of water tanks 2. The ends of the two sets of water supply branch pipes 23 away from the water tanks 2 are connected to the same water supply main pipe 24. Annular protective seats 3 are slidably sleeved on the outer side of the two sets of water tanks 2. Lifting components 4 for driving their longitudinal lifting are connected to the outer side of the two sets of annular protective seats 3. A scraping component 6 for scraping off the deposits on the bottom of the water tanks 2 is connected to the support frame 1.

[0031] Among them, water tank 2 is used to hold water, and the water is heated by heat exchange with high-temperature coke in coke tank 100, thereby realizing the effective recovery and utilization of heat.

[0032] Specifically, in practical applications, water tank 2 is preferably filled with demineralized water to reduce scale buildup and maintenance frequency. Secondly, water tank 2 also incorporates temperature and level sensors to monitor the water temperature and level in real time, ensuring the stability of the heating system. To ensure sufficient heating and efficient circulation, the actual water capacity of water tank 2 is preferably greater than 60% of its total capacity. Furthermore, water tank 2 is equipped with a maintenance port with a sealed cover, facilitating access for maintenance personnel.

[0033] Specifically, steam valves are installed at both ends of the steam branch pipe 21. Water supply valves are installed at both ends of the water supply branch pipe 23. In addition, the water supply branch pipe 23 can adopt a tangential inlet (tangent to the inner wall of the water tank 2 in a horizontal direction) at the water inlet of the water tank 2, thereby forming a rotating water flow, which helps to improve the water flow and heat exchange effect.

[0034] Specifically, the purpose of setting up two sets of support frames 1 and water tank 2 is that, since the two coke tanks 100 of the coke transport car adopt a cyclic operation mode, when the coke tank 100 on the right side of the coke transport car is full of red-hot coke, the empty coke tank on the left side of the coke transport car needs to stop under the coke tank elevator to wait for the empty coke tank 100. At this time, the red-hot coke in the right coke tank 100 will heat the water in the right water tank 2 (e.g., Figure 2 (As shown). When the coke can 100 on the left side of the coke transport car is full of red-hot coke, the empty coke can on the right side of the coke transport car needs to stop below the coke can elevator to wait for the empty coke can 100. At this time, the red-hot coke in the left coke can 100 will heat the water in the left water tank 2 (as shown). Figure 3 (As shown).

[0035] This invention involves installing two sets of water tanks 2 on both sides of the coke oven elevator, with each set of water tanks 2 corresponding to the stopping positions of two sets of coke ovens 100. When the coke transport car moves to the dry quenching furnace, the coke ovens 100 filled with red-hot coke are positioned directly below the corresponding water tanks 2. At this time, the high temperature of the coke inside the coke ovens 100 rapidly heats the water in the water tanks 2, converting it into steam, which is then transported via the steam branch pipe 21. This invention effectively utilizes the switching waiting time between the two sets of coke ovens 100, converting the heat from the coke inside the coke ovens 100 into thermal energy, thus improving energy utilization efficiency and avoiding thermal energy waste.

[0036] By setting up an annular protective seat 3, when the coke tank 100 moves below the water tank 2, the lifting component 4 controls the annular protective seat 3 to descend, thereby shielding the gap between the water tank 2 and the coke tank 100, reducing heat loss and improving heat conversion efficiency. In addition, the annular protective seat 3 can be designed as an insulation structure to reduce heat loss.

[0037] By incorporating a scraper assembly 6, when the coke canister 100 moves away from below the water tank 2, the scraper assembly 6 can remove the deposits on the bottom of the water tank 2, thereby improving the heating efficiency of the water tank 2. This is because when the red-hot, high-temperature coke inside the coke canister 100 heats the water in the water tank 2, the coke inside the coke canister 100 generates dust and other particulate matter, which adheres to the bottom of the water tank 2. By regularly cleaning these deposits, not only can the cleanliness of the water tank 2 be ensured, reducing the decrease in thermal efficiency caused by the deposits hindering heat transfer, but it can also ensure that the water tank 2 maintains high efficiency during each heating process.

[0038] Furthermore, an annular scraper 5 for scraping off the deposits on the inner wall of the annular protective seat 3 is also sandwiched between the water tank 2 and the annular protective seat 3. The annular scraper 5 is fixedly sleeved on the lower outer side of the water tank 2.

[0039] Specifically, when the hot coke in the coke tank 100 heats the water in the water tank 2, the dust and other particulate matter generated by the coke will adhere to the inner side of the annular protective seat 3. When the heating ends, the lifting component 4 drives the annular protective seat 3 to rise, and the inner wall of the annular protective seat 3 continues to contact the annular scraper 5, thereby scraping off the deposits on the inner wall of the annular protective seat 3.

[0040] Furthermore, the annular scraper 5 includes an annular plate 51 and an annular scraper blade 52. The annular plate 51 is fixedly sleeved on the outside of the water tank 2, and the annular scraper blade 52 is fixedly connected to the lower end of the annular plate 51, with the included angle between the two being an obtuse angle.

[0041] Specifically, the obtuse angle design between the annular scraper 52 and the annular plate 51 ensures smoother contact between the annular scraper 52 and the inner wall of the annular protective seat 3, avoiding scratches to the inner wall of the annular protective seat 3. At the same time, the obtuse angle design can better remove attached substances.

[0042] Furthermore, the lifting assembly 4 includes two sets of lifting telescopic rods 41 and two sets of ear seats 42. The fixed ends of the two sets of lifting telescopic rods 41 are respectively fixedly connected to the left and right sides of the door frame 11, and the two sets of ear seats 42 are respectively fixedly connected to the left and right sides of the annular protective seat 3. The telescopic ends of the two sets of lifting telescopic rods 41 are respectively fixedly connected to the two sets of ear seats 42.

[0043] Specifically, once the coke pot 100 is in place, the telescopic ends of the two sets of lifting telescopic rods 41 are extended, causing the two sets of lugs 42 and the annular protective seat 3 to descend. After heating is completed, the telescopic ends of the two sets of lifting telescopic rods 41 are retracted, indirectly causing the annular protective seat 3 to rise. Furthermore, under the action of the annular scraper 5, the deposits adhering to the inner wall of the annular protective seat 3 can be scraped off simultaneously. In addition, the lifting telescopic rods 41 preferably use high-temperature resistant hydraulic cylinders, and external cooling and protection devices can be added according to the actual operating environment.

[0044] Furthermore, ear plates 43 are fixedly connected to the front and rear sides of the annular protective seat 3, and support seats 44 are symmetrically fixed to the front and rear sides of the upper end of the support frame 1. Longitudinal sliding rods 45 are fixedly connected to the support seats 44, and the two sets of ear plates 43 are slidably connected to the two sets of longitudinal sliding rods 45 respectively.

[0045] Specifically, the annular protective seat 3 is raised and lowered under the drive of the lifting assembly 4. During this process, the annular protective seat 3 causes the two sets of ear plates 43 to slide relative to the two sets of longitudinal slide rods 45. The two sets of longitudinal slide rods 45 play a limiting and guiding role on the two sets of ear plates 43, ensuring that the annular protective seat 3 can be raised and lowered along a predetermined path.

[0046] Furthermore, the slag scraping assembly 6 includes a bottom scraper 61, which is slidably mounted on the upper end of the support frame 1. A drive component 62 is connected to the support frame 1 to drive the bottom scraper 61 to move along the bottom of the water tank 2.

[0047] Furthermore, the drive component 62 includes two sets of fixed seats 621, two sets of lead screws 622, and a motor 627. The two sets of fixed seats 621 are respectively fixed on the upper left and right sides of the support frame 1. The two sets of lead screws 622 are rotatably connected to the inside of the two sets of fixed seats 621. Nut seats 623 are threaded on the outer side of the two sets of lead screws 622. L-shaped brackets 624 are fixedly connected to the lower end of the two sets of nut seats 623. The two sets of L-shaped brackets 624 are symmetrically arranged, and the two sets of L-shaped brackets 624 are respectively fixedly connected to the left and right ends of the bottom scraper 61 by bolts. The front end of the two sets of lead screws 622 passes through the fixed seat 621 on the corresponding side and is fixedly fitted with a sprocket 625. The outer side of the two sets of sprockets 625 is jointly fitted with a synchronous chain 626. The front end of one set of lead screws 622 is fixedly connected to the output shaft of the motor 627. The motor 627 is fixedly connected to one side of the support frame 1.

[0048] Specifically, when it is necessary to scrape off the deposits at the bottom of the water tank 2, the motor 627 can be controlled to operate. The output shaft of the motor 627 drives one set of lead screws 622 to rotate, and one set of lead screws 622 drives the sprocket 625 at its front end to rotate. Under the synchronous transmission of the synchronous chain 626, the other set of sprockets 625 and lead screws 622 also rotate synchronously. At this time, the nut seats 623 on the outside of the two sets of lead screws 622 will drive the two sets of L-shaped brackets 624 and the bottom scraper 61 to move synchronously forward or backward, thereby achieving effective scraping off the deposits at the bottom of the water tank 2. When it is necessary to operate the bottom scraper 61 in the opposite direction, it is only necessary to control the output shaft of the motor 627 to operate in the opposite direction.

[0049] Working principle:

[0050] First, when the coke can 100 on the left side of the coke transport car is full of red-hot coke, the empty coke can on the right side of the coke transport car needs to stop below the coke can elevator to wait for the empty coke can 100 to be received (the waiting time is about two minutes). At this time, the coke can 100 on the left side, which is full of red-hot coke, is located below the water tank 2 on the left side.

[0051] In the second step, the red-hot coke inside the coke pot 100 emits high-temperature heat, which heats the water in the water tank 2 on the left. After the water in the water tank 2 is heated, the heat energy is converted into steam, which is then transported to the steam collection device through the steam branch pipe 21 and the steam main pipe 22.

[0052] Thirdly, during the heating process, the extension end of the lifting telescopic rod 41 can be controlled to extend and push the annular protective seat 3 down, thereby shielding and protecting the gap between the water tank 2 and the coke tank 100.

[0053] Fourth, after the empty coke can 100 is placed, the telescopic end of the lifting telescopic rod 41 is shortened, thereby causing the annular protective seat 3 to rise and reset. During this process, the annular scraper 5 can scrape off the attached substances on the inner wall of the annular protective seat 3.

[0054] Fifth, the coke transport car moves the coke can 100, filled with red-hot coke, to the bottom of the coke can elevator for lifting. Then, the coke transport car moves the empty coke can 100 to the coke oven outlet to receive coke.

[0055] Step 6: After the coke transport car leaves the water tank 2, water is replenished to the water tank 2 via the water supply branch pipe 23 based on the actual data from the liquid level sensor inside the water tank 2. At the same time, the bottom scraper 61 can be driven by the drive component 62 to clean and remove the deposits on the bottom of the water tank 2.

[0056] It should be noted that all the electrical equipment mentioned above is electrically connected to the control terminal to achieve automated operation of the system. The circuit design and structure used here employ conventional technical solutions; therefore, they will not be elaborated upon further in this article.

[0057] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A coke heat recovery device in a coke drum, characterized by: It includes two sets of support frames (1) and two sets of water tanks (2). The two sets of support frames (1) are respectively installed on the left and right sides of the coke oven elevator. The two sets of water tanks (2) correspond to the stopping positions of the two sets of coke ovens (100). The upper end of the support frame (1) is fixedly connected to a portal frame (11). The two sets of water tanks (2) are respectively fixedly connected to the lower end of the portal frame (11) on the corresponding side by a fixing frame. The upper end of the two sets of water tanks (2) is respectively connected to a steam branch pipe (21). The end of the two sets of steam branch pipes (21) away from the water tank (2) The two sets of water tanks (2) are connected to the same steam main pipe (22). The upper rear ends of the two sets of water tanks (2) are respectively connected to water supply branch pipes (23). The ends of the two sets of water supply branch pipes (23) away from the water tanks (2) are connected to the same water supply main pipe (24). The outer sides of the two sets of water tanks (2) are slidably fitted with annular protective seats (3). The outer sides of the two sets of annular protective seats (3) are connected to lifting components (4) for driving their longitudinal lifting. The support frame (1) is connected to a slag scraping component (6) for scraping off the deposits attached to the bottom of the water tanks (2). The water tank (2) is used to hold water and heats the water through heat exchange with the high-temperature coke in the coke tank (100).

2. The coke heat recovery device in a coke oven according to claim 1, characterized in that, An annular scraper (5) for scraping off the material attached to the inner wall of the annular protective seat (3) is also sandwiched between the water tank (2) and the annular protective seat (3). The annular scraper (5) is fixedly sleeved on the lower outer side of the water tank (2).

3. The coke heat recovery device in a coke oven according to claim 2, characterized in that, The annular scraper (5) includes an annular plate (51) and an annular scraper (52). The annular plate (51) is fixedly sleeved on the outside of the water tank (2), and the annular scraper (52) is fixedly connected to the lower end of the annular plate (51) with the included angle between the two being an obtuse angle.

4. A coke heat recovery device in a coke oven according to claim 1 or 3, characterized in that, The lifting assembly (4) includes two sets of lifting telescopic rods (41) and two sets of ear seats (42). The fixed ends of the two sets of lifting telescopic rods (41) are respectively fixedly connected to the left and right sides of the door frame (11), and the two sets of ear seats (42) are respectively fixedly connected to the left and right sides of the annular protective seat (3). The telescopic ends of the two sets of lifting telescopic rods (41) are respectively fixedly connected to the two sets of ear seats (42).

5. The coke heat recovery device in a coke oven according to claim 4, characterized in that, The annular protective seat (3) is fixedly connected to ear plates (43) on both the front and rear sides. The upper end of the support frame (1) is symmetrically fixed with support seats (44) on the front and rear sides. The support seats (44) are fixedly connected with longitudinal sliding rods (45). The two sets of ear plates (43) are slidably connected to the two sets of longitudinal sliding rods (45) respectively.

6. The coke heat recovery device in a coke oven according to claim 1, characterized in that, The slag scraping assembly (6) includes a bottom scraper (61) which is slidably mounted on the upper end of a support frame (1). A drive unit (62) is connected to the support frame (1) to drive the bottom scraper (61) to move along the bottom of the water tank (2).

7. The coke heat recovery device in a coke oven according to claim 6, characterized in that, The driving component (62) includes two sets of fixed seats (621), two sets of lead screws (622), and one set of motors (627). The two sets of fixed seats (621) are respectively fixed on the upper left and right sides of the support frame (1). The two sets of lead screws (622) are respectively rotatably connected to the inside of the two sets of fixed seats (621). Nut seats (623) are threaded on the outer side of the two sets of lead screws (622). L-shaped brackets (624) are fixedly connected to the lower end of the two sets of nut seats (623). 24) Symmetrically arranged, and the two sets of L-shaped brackets (624) are respectively fixedly connected to the left and right ends of the bottom scraper (61) by bolts. The front ends of the two sets of lead screws (622) pass through the corresponding side of the fixed seat (621) and are fixedly sleeved with sprockets (625). The outer sides of the two sets of sprockets (625) are jointly sleeved with a synchronous chain (626). The front end of one set of lead screws (622) is fixedly connected to the output shaft of the motor (627). The motor (627) is fixedly connected to one side of the support frame (1).

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