A dryer

Abstract

The application relates to a drying machine, belonging to the technical field of can-making equipment, which comprises a frame body and horizontal conveying belts symmetrically arranged on two sides of the frame body, each of the conveying belts is provided with an electromagnetic induction furnace head corresponding to the conveying belt and parallel to the conveying belt, a limiting rod vertically connected with the side wall of the frame body and slidingly connected with the frame body is fixedly connected to the upper side of the furnace head, and a lifting assembly for driving the electromagnetic induction furnace heads to simultaneously move in the vertical direction is arranged on the frame body. The application has the effect of reducing the adverse effect on work efficiency.

Description

Technical Field

[0001] This application relates to the technical field of can-making equipment, and in particular to a dryer. Background Technology

[0002] According to the production process, metal cans are divided into two-piece cans and three-piece cans. After being rolled and welded, a vertical weld is formed on the cylindrical can wall of the three-piece can. A protective layer needs to be applied to the weld area of ​​the can wall to make the coated area resistant to acid and sulfur without contaminating the contents. After the coating is applied, the coated area must be heated and dried immediately.

[0003] A typical electromagnetic induction dryer consists of two horizontal circulating conveyor belts, one on each side. Above these belts is an electromagnetic induction furnace head for drying the protective layer on the tank wall. The conveyor belts drive the cylindrical tank wall to move and pass sequentially under the electromagnetic induction furnace head, completing the drying process. The upper ends of the furnace head are typically connected to vertical screws threaded into the dryer frame. When drying tank walls of different sizes, the screws are rotated, driving the furnace head to move vertically until the distance between the lower side of the furnace head and the tank wall to be dried is sufficient for complete drying of the protective layer, thus adjusting the furnace head height.

[0004] In related technologies, when adjusting the height of the burner head using a screw, it is necessary to simultaneously rotate the corresponding screw on the upper side of the burner head and adjust the height of the burner heads on both sides in sequence. This is time-consuming and labor-intensive, and may lead to a decrease in work efficiency. Utility Model Content

[0005] In order to reduce the adverse impact on work efficiency, this application provides a dryer.

[0006] The dryer provided in this application adopts the following technical solution: A dryer includes a frame and horizontal conveyor belts symmetrically installed on both sides of the frame. Each conveyor belt is equipped with an electromagnetic induction burner that corresponds to and is parallel to the conveyor belt. Each burner has a vertical limiting rod fixedly connected to its upper side and slidably connected to the side wall of the frame. The frame is equipped with a lifting assembly that drives the electromagnetic induction burner to move simultaneously in the vertical direction.

[0007] By adopting the above technical solution, the lifting component drives the electromagnetic induction burner head to move in the vertical direction. At this time, the limit rod slides with the corresponding electromagnetic induction burner head and the frame and guides the electromagnetic induction burner head. When the distance between the electromagnetic induction burner head and the conveyor belt is adapted to the specifications of the tank wall to be dried, the movement of the electromagnetic induction burner head stops, thereby achieving the effect of adjusting the height of the electromagnetic induction burner heads on both sides at the same time and reducing the adverse impact on work efficiency.

[0008] Optionally, the lifting assembly includes two rotating rods that correspond one-to-one with the electromagnetic induction burner heads and are parallel to the length direction of the frame. The rotating rods are rotatably connected to the frame and are arranged sequentially along the width direction of the frame. The ends of the rotating rods are fixedly connected to lifting rods facing the corresponding electromagnetic induction burner heads. The upper ends of the electromagnetic induction burner heads are fixedly connected to hinge rods that correspond one-to-one with the lifting rods and are hinged and slidably connected to the corresponding lifting rods. The frame is provided with driving components that drive the rotating rods to rotate simultaneously in opposite directions.

[0009] By adopting the above technical solution, the driving component drives the rotating rod to rotate in opposite directions simultaneously. At this time, the lifting rod swings up or down under the drive of the corresponding rotating rod, thereby driving the electromagnetic induction burner head to move in the height direction of the frame through the hinge rod. The limiting rod slides with the corresponding electromagnetic induction burner head and the frame and guides the electromagnetic induction burner head, thereby facilitating the simultaneous adjustment of the height of the electromagnetic induction burner head and reducing the adverse effects on work efficiency.

[0010] Optionally, each of the rotating rods is fitted with and fixedly connected to a worm gear, and the worm gears are engaged with the same worm shaft that is rotatably connected to the frame along the height direction of the frame. The frame is equipped with a motor that drives the worm shaft to rotate.

[0011] By adopting the above technical solution, the motor drives the worm gear to rotate, which in turn drives the rotating rod to rotate in the opposite direction. This allows the lifting rod to swing in the height direction of the frame and drive the electromagnetic induction burner head to move in the height direction of the frame through the hinge rod. This facilitates simultaneous adjustment of the height of the electromagnetic induction burner head and reduces the adverse effects on work efficiency.

[0012] Optionally, each of the upper sides of the conveyor belt feeding end is provided with symmetrical guide plates arranged along the length of the conveyor belt. The end of the guide plate near the feeding end of the conveyor belt is hinged to the frame. The frame is provided with an adjustment component that drives the guide plates on the same conveyor belt to rotate in a direction that moves closer to each other along the hinge point.

[0013] By adopting the above technical solution, when drying tank walls of different specifications, the adjusting component drives the guide plates on the same conveyor belt to rotate along their own hinged ends in a direction that moves closer to or further away from each other until the distance between the ends of the guide plates on the same conveyor belt away from the material feeding end of the conveyor belt is adapted to the diameter of the tank wall to be dried. Thus, during the tank wall conveying process, the tank wall is guided until it moves along the midline of the conveyor belt width, which makes it easier for the electromagnetic induction furnace head to align with and dry the protective layer on the tank wall, thereby improving the drying effect.

[0014] Optionally, the adjustment assembly includes a torsion spring installed between one end of the guide plate near the feeding end of the conveyor belt and the frame. When the guide plate is parallel to the length direction of the conveyor belt, the torsion spring is not deformed. The frame is provided with a pusher that pushes one end of the guide plate away from the torsion spring toward the center of the corresponding width direction of the conveyor belt.

[0015] By adopting the above technical solution, the pusher pushes the guide plate away from the torsion spring to rotate towards or away from the middle of the corresponding conveyor belt width direction. The torsion spring deforms, and the guide plate forms an inclined surface, which facilitates the guidance of the can wall to be conveyed until the can wall moves along the midline of the conveyor belt width. This makes it easier for the electromagnetic induction furnace head to align with and dry the protective layer on the can wall, thus improving the drying effect.

[0016] Optionally, an extension plate parallel to the length direction of the conveyor belt is hinged to the side of the guide plate away from the torsion spring. When the pusher drives the guide plate to rotate, the extension plate moves with the guide plate toward or away from the center of the corresponding width direction of the conveyor belt.

[0017] By adopting the above technical solution, when the drive component rotates the guide plate, the extension plate moves with the corresponding guide plate and extends the contact area between the tank wall and the guide plate, which further facilitates the movement of the tank wall along the center line of the conveyor belt width and aligns it with the electromagnetic induction furnace head, thereby improving the drying effect.

[0018] Optionally, the pushing component includes hydraulic cylinders symmetrically arranged on the same conveyor belt at the end of the extension plate near the guide plate and at the opposite side. Hydraulic cylinders are also provided at the end of the extension plate away from the guide plate and at the opposite side. All hydraulic cylinders are fixedly connected to the frame. The telescopic rods of the hydraulic cylinders are inserted into the corresponding extension plates and fixedly connected to limit blocks. The limit blocks are slidably connected to the extension plates along the length direction of the extension plates.

[0019] By adopting the above technical solution, the extension rod of the hydraulic cylinder extends or shortens, thereby driving the corresponding extension plate to move closer to or further away from the center of the conveyor belt through the limiting block. At this time, the corresponding guide plate rotates along its own hinge end, and the limiting block is slidably connected to the side wall of the corresponding extension plate until the distance between the end of the guide plate on the same conveyor belt away from the material feeding end of the conveyor belt is adapted to the diameter of the tank wall to be dried, which facilitates driving the tank wall to move along the center line of the conveyor belt width and align with the electromagnetic induction furnace head, thereby improving the drying effect.

[0020] Optionally, the extension plate is rotatably connected to a plurality of rotating rollers arranged sequentially along the length direction of the extension plate and parallel to the height direction of the extension plate on one side near the middle of the corresponding width direction of the conveyor belt, and the tank wall can contact the side wall of the rotating rollers.

[0021] By adopting the above technical solution, when the tank wall moves to the extension plate, the rotating rollers on the extension plates on both sides of the tank wall contact the tank wall and rotate with the movement of the tank wall. This reduces the friction force on the tank wall while the extension plate drives the tank wall to move along the center line of the conveyor belt width, thereby reducing the adverse effects on work efficiency.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The lifting assembly drives the electromagnetic induction burner head to move vertically. At this time, the limit rod slides with the corresponding electromagnetic induction burner head and the frame and guides the electromagnetic induction burner head. When the distance between the electromagnetic induction burner head and the conveyor belt is adapted to the specifications of the tank wall to be dried, the movement of the electromagnetic induction burner head stops, thereby achieving the effect of adjusting the height of the electromagnetic induction burner heads on both sides at the same time, reducing the adverse impact on work efficiency. 2. The driving component drives the rotating rod to rotate in opposite directions at the same time. At this time, the lifting rod swings up or down under the drive of the corresponding rotating rod, thereby driving the electromagnetic induction burner head to move in the height direction of the frame through the hinge rod. The limiting rod slides with the corresponding electromagnetic induction burner head and the frame and guides the electromagnetic induction burner head, so as to facilitate the simultaneous adjustment of the height of the electromagnetic induction burner head and reduce the adverse effects on work efficiency. 3. The adjusting component drives the guide plates on the same conveyor belt to rotate along their hinged ends in a direction that moves closer to or further away from each other until the distance between the ends of the guide plates on the same conveyor belt that are away from the material feeding end of the conveyor belt is adapted to the diameter of the tank wall to be dried. This guides the tank wall during the conveying process until the tank wall moves along the midline of the conveyor belt width, making it easier for the electromagnetic induction furnace head to align with and dry the protective layer on the tank wall, thus improving the drying effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the dryer in the embodiments of this application.

[0024] Figure 2 This is a structural diagram illustrating the positional relationship between the frame and the lifting assembly in an embodiment of this application.

[0025] Figure 3 This is a structural schematic diagram illustrating the positional relationship between the conveyor belt and the lifting component in an embodiment of this application.

[0026] Figure 4 yes Figure 2 Enlarged view of the structure at point A in the middle.

[0027] Figure 5 This is a structural schematic diagram illustrating the positional relationship between the conveyor belt and the guide plate in an embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Conveyor belt; 12. Mounting door; 13. Exhaust pipe; 14. Mounting plate; 141. Limiting plate; 2. Electromagnetic induction burner head; 21. Limiting rod; 3. Lifting assembly; 31. Rotating rod; 32. Mounting ring; 33. Lifting rod; 331. Waist-shaped hole; 34. Hinge rod; 341. Fixing block; 35. Driving component; 351. Worm gear; 352. Worm; 353. Motor; 4. Guide plate; 41. Hinge shaft; 42. Receiving hole; 5. Adjusting assembly; 51. Torsion spring; 52. Extension plate; 521. Sliding groove; 53. Pushing component; 531. Hydraulic cylinder; 532. Limiting block. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] This application discloses a dryer. (Refer to...) Figure 1 and Figure 2 A dryer includes a vertical frame 1 with its length arranged horizontally. Conveyor belts 11 are installed horizontally on both sides of the middle section of the frame 1, extending along the length of the frame 1. Two vertical mounting doors 12 are sequentially arranged along the length of the frame 1 on the upper side of each conveyor belt 11. The upper sides of each mounting door 12 are hinged to the side wall of the frame 1. A steam exhaust pipe 13 is fixedly connected to the middle of the upper side of the frame 1, communicating with the space formed by the frame 1 and the mounting doors 12, for discharging steam generated during the drying process.

[0031] Reference Figure 2 and Figure 3 A horizontal mounting plate 14 is provided on the upper side of the conveyor belt 11 and is arranged along the length of the frame 1. The mounting plate 14 is located below the exhaust pipe 13 and is arranged along the center line of the width of the frame 1. On both sides of the mounting plate 14, there are horizontal electromagnetic induction burners 2 arranged along the length of the frame 1 and corresponding to the conveyor belt 11. The electromagnetic induction burners 2 are directly opposite the middle of the corresponding conveyor belt 11 in the width direction.

[0032] Vertical limiting rods 21 are fixedly connected to the middle of the upper side of the electromagnetic induction burner head 2. Horizontal limiting plates 141, corresponding one-to-one with the limiting rods 21, are fixedly connected to the middle of both sides of the mounting plate 14. The limiting rods 21 pass through the corresponding limiting plates 141 and are slidably connected to the corresponding limiting plates 141. The mounting plate 14 is equipped with a lifting assembly 3 that drives the electromagnetic induction burner head 2 to move simultaneously in the vertical direction.

[0033] The lifting assembly 3 drives the electromagnetic induction burner head 2 to move in the vertical direction. At this time, the limit rod 21 slides with the corresponding electromagnetic induction burner head 2 and the frame 1 and guides the electromagnetic induction burner head 2. When the distance between the electromagnetic induction burner head 2 and the conveyor belt 11 is adapted to the specifications of the tank wall to be dried, the movement of the electromagnetic induction burner head 2 stops, so as to achieve the effect of adjusting the height of the electromagnetic induction burner heads 2 on both sides at the same time.

[0034] Two horizontal rotating rods 31 are rotatably connected to the upper side of the mounting plate 14, arranged sequentially and symmetrically along the width direction of the mounting plate 14. The rotating rods 31 are all arranged along the length direction of the mounting plate 14, and the ends of the rotating rods 31 are sleeved and fixedly connected to the mounting rings 32. The side of the mounting rings 32 closest to the adjacent electromagnetic induction burner head 2 is fixedly connected to a downwardly inclined lifting rod 33 facing the corresponding electromagnetic induction burner head 2. The upper end of the electromagnetic induction burner head 2 is fixedly connected to a vertical hinge rod 34 that corresponds one-to-one with the lifting rod 33.

[0035] The upper ends of the hinge rods 34 on the same electromagnetic induction furnace head 2 are all bent to the horizontal in the direction of mutual approach. The lifting rods 33 are all provided with waist-shaped holes 331 arranged along their own length direction. The bent end of the hinge rods 34 passes through the corresponding waist-shaped holes 331 and is fixedly connected to a fixing block 341 for limiting position. The mounting plate 14 is provided with a driving member 35 that drives the rotating rod 31 to rotate simultaneously and in opposite directions.

[0036] Reference Figure 2 and Figure 3 The driving component 35 includes a worm gear 351 that corresponds to the rotating rod 31 and is sleeved in the middle of the corresponding rotating rod 31 and fixedly connected to the rotating rod 31. The middle part of the mounting plate 14 in the length direction is provided with a vertical worm 352 located between the worm gears 351 and meshing with all the worm gears 351. The lower end of the worm 352 passes through the mounting plate 14 and is rotatably connected to the mounting plate 14. A motor 353 that drives the worm 352 to rotate is installed on the lower side of the mounting plate 14.

[0037] Motor 353 drives worm gear 352 to rotate worm wheel 351, thereby driving rotating rod 31 to rotate in the opposite direction. At this time, lifting rod 33 swings up or down under the drive of corresponding rotating rod 31, thereby driving electromagnetic induction burner head 2 to move in the height direction of frame 1 through hinge rod 34. Limiting rod 21 slides with corresponding electromagnetic induction burner head 2 and frame 1 and guides electromagnetic induction burner head 2, so as to adjust the height of electromagnetic induction burner head 2 at the same time.

[0038] Reference Figure 2 and Figure 4 Two symmetrical vertical guide plates 4 are provided on the upper side of the feeding end of the conveyor belt 11 and are arranged along the length of the conveyor belt 11. A vertical hinge shaft 41 is inserted and fixedly connected to one end of the guide plate 4 near the feeding end of the conveyor belt 11. The lower end of the hinge shaft 41 is inserted into the frame 1 and rotatably connected to the frame 1. The frame 1 is provided with an adjustment component 5 that drives the guide plates 4 on the same conveyor belt 11 to rotate along their own hinge shaft 41 in a direction that brings them closer to each other.

[0039] Reference Figure 2 , Figure 4 and Figure 5The adjusting assembly 5 includes torsion springs 51 that correspond one-to-one with the hinge shafts 41 and are located on the upper side of the conveyor belt 11. Each guide plate 4 has a receiving hole 42 penetrating through it at one end near the corresponding hinge shaft 41. The torsion springs 51 are all located in the corresponding receiving holes 42 and sleeved on the lower end of the corresponding hinge shaft 41. One end of each torsion spring 51 is fixedly connected to the frame 1, and the other end is fixedly connected to the corresponding guide plate 4. When the torsion springs 51 are not deformed, the guide plate 4 is parallel to the length direction of the conveyor belt 11.

[0040] Each guide plate 4 has a vertical extension plate 52 hinged to its end away from the hinge shaft 41, which is always parallel to the length of the conveyor belt 11. Multiple vertical rotating rollers (not shown in the figure) are rotatably connected to the sides of the extension plates 52 on the same conveyor belt 11 that are close to each other. These rollers are arranged sequentially and evenly along the length of the conveyor belt 11. When the tank wall moves along the length of the extension plate 52, the rotating rollers are located on both sides of the tank wall and can contact it. The frame 1 is equipped with a pusher 53 that drives the end of the guide plate 4 near the extension plate 52 to rotate towards the middle of the corresponding conveyor belt 11. At this time, the extension plate 52 moves with the corresponding guide plate 4.

[0041] Reference Figure 2 and Figure 5 The pusher 53 includes a horizontal hydraulic cylinder 531 that corresponds one-to-one with the extension plate 52 and is located at the end of the extension plate 52 near the guide plate 4 and away from the middle of the corresponding conveyor belt 11. The telescopic rods of the hydraulic cylinders 531 are all facing the corresponding extension plate 52 and are fixedly connected to the frame 1. The end of the extension plate 52 near the hydraulic cylinder 531 and away from the guide plate 4 is also provided with a horizontal hydraulic cylinder 531 that is fixedly connected to the frame 1 and whose telescopic rods face the extension plate 52.

[0042] Both ends of the extension plates 52 on the same conveyor belt 11, which are far apart from each other, are fitted with limit blocks 532 that correspond one-to-one with the telescopic rods of the hydraulic cylinders 531. The side walls of the extension plates 52 are provided with sliding grooves 521 that correspond one-to-one with the limit blocks 532 and are arranged along the length of the extension plates 52. The limit blocks 532 are all slidably connected to the extension plates 52 along the length of the corresponding sliding grooves 521. The telescopic rods of the hydraulic cylinders 531 pass through the side walls of the extension plates 52 and are fixedly connected to the corresponding limit blocks 532.

[0043] The extension rod of the hydraulic cylinder 531 extends or retracts, thereby driving the corresponding extension plate 52 to move closer to or further away from the middle of the conveyor belt 11 via the limiting block 532. At this time, the corresponding guide plate 4 rotates along its own hinge end, the torsion spring 51 deforms, and the limiting block 532 slides in connection with the side wall of the corresponding extension plate 52 until the distance between the end of the guide plate 4 on the same conveyor belt 11 away from the feeding end of the conveyor belt 11 is adapted to the diameter of the tank wall to be dried. At this time, the guide plate 4 forms an inclined surface, and the extension plate 52 extends the contact area between the tank wall and the guide plate 4, which facilitates the guidance of the tank wall to be conveyed until the tank wall moves along the midline of the width of the conveyor belt 11 and is aligned with the electromagnetic induction furnace head 2, thereby improving the drying effect.

[0044] When the tank wall moves to the extension plate 52, the rotating rollers on the extension plates 52 on both sides of the tank wall come into contact with the tank wall and rotate as the tank wall moves. This reduces the friction on the tank wall while the extension plate 52 drives the tank wall to move along the center line of the width of the conveyor belt 11, thus reducing the adverse effects on work efficiency.

[0045] The implementation principle of a dryer according to an embodiment of this application is as follows: the motor 353 drives the worm gear 352 to rotate the worm wheel 351, thereby driving the rotating rod 31 to rotate in the opposite direction at the same time. At this time, the lifting rod 33 swings up or down under the drive of the corresponding rotating rod 31, thereby driving the electromagnetic induction furnace head 2 to move in the height direction of the frame 1 through the hinge rod 34. The limiting rod 21 slides with the corresponding electromagnetic induction furnace head 2 and the frame 1 and guides the electromagnetic induction furnace head 2, so as to adjust the height of the electromagnetic induction furnace head 2 at the same time.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dryer, characterized in that: It includes a frame (1) and horizontal conveyor belts (11) symmetrically installed on both sides of the frame (1). Each conveyor belt (11) is equipped with an electromagnetic induction burner head (2) that corresponds to and is parallel to the conveyor belt (11). Each burner head is fixedly connected to a vertical limiting rod (21) that is slidably connected to the side wall of the frame (1). The frame (1) is equipped with a lifting assembly (3) that drives the electromagnetic induction burner head (2) to move in the vertical direction.

2. The dryer according to claim 1, characterized in that: The lifting assembly (3) includes two rotating rods (31) that correspond one-to-one with the electromagnetic induction burner (2) and are parallel to the length direction of the frame (1). The rotating rods (31) are rotatably connected to the frame (1) and are arranged sequentially along the width direction of the frame (1). The ends of the rotating rods (31) are fixedly connected to lifting rods (33) facing the corresponding electromagnetic induction burner (2). The upper end of the electromagnetic induction burner (2) is fixedly connected to a hinge rod (34) that corresponds one-to-one with the lifting rod (33) and is hinged and slidably connected to the corresponding lifting rod (33). The frame (1) is provided with a driving member (35) that drives the rotating rods (31) to rotate simultaneously and in opposite directions.

3. A dryer according to claim 2, characterized in that: Each rotating rod (31) is fitted with and fixedly connected to a worm gear (351). The worm gears (351) are meshed with the same worm (352) on the side of each other that is close to each other. The worm gear (352) is rotatably connected to the frame (1) along the height direction of the frame (1). The frame (1) is provided with a motor (353) that drives the worm gear (352) to rotate.

4. A dryer according to claim 3, characterized in that: The upper side of the feeding end of the conveyor belt (11) is provided with symmetrical guide plates (4) arranged along the length direction of the conveyor belt (11). The end of the guide plate (4) near the feeding end of the conveyor belt (11) is hinged to the frame (1). The frame (1) is provided with an adjustment component (5) that drives the guide plates (4) on the same conveyor belt (11) to rotate in a direction that moves closer to each other along the hinge point.

5. A dryer according to claim 4, characterized in that: The adjustment assembly (5) includes a torsion spring (51) installed between one end of the guide plate (4) near the feeding end of the conveyor belt (11) and the frame (1). When the guide plate (4) is parallel to the length direction of the conveyor belt (11), the torsion spring (51) does not deform. The frame (1) is provided with a pusher (53) that pushes the end of the guide plate (4) away from the torsion spring (51) to move closer to or away from the middle of the corresponding width direction of the conveyor belt (11).

6. A dryer according to claim 5, characterized in that: On the side of the guide plate (4) away from the torsion spring (51), there is an extension plate (52) parallel to the length direction of the conveyor belt (11). When the pusher (53) drives the guide plate (4) to rotate, the extension plate (52) moves with the guide plate (4) toward or away from the center of the corresponding conveyor belt (11) in the width direction.

7. A dryer according to claim 6, characterized in that: The pusher (53) includes hydraulic cylinders (531) symmetrically arranged on the same conveyor belt (11) at the end of the extension plate (52) near the guide plate (4) and away from each other on one side. Hydraulic cylinders (531) are also provided at the end of the extension plate (52) on the same conveyor belt (11) away from the guide plate (4) and away from each other on one side. The hydraulic cylinders (531) are all fixedly connected to the frame (1). The telescopic rods of the hydraulic cylinders (531) are all inserted into the corresponding extension plate (52) and fixedly connected to the limit block (532). The limit block (532) is slidably connected to the extension plate (52) along the length direction of the extension plate (52).

8. A dryer according to claim 7, characterized in that: On one side of the extension plate (52) near the middle of the corresponding conveyor belt (11) in the width direction, there are multiple rotating rollers that are arranged sequentially along the length direction of the extension plate (52) and parallel to the height direction of the extension plate (52), and the tank wall can contact the side wall of the rotating rollers.

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