Tunnel type constant-temperature refrigerating device

Abstract

The tunnel type constant-temperature refrigerating device comprises a material conveying belt, a sweeping assembly and a dust blowing assembly, the material conveying belt comprises two conveying wheels, a conveying chain belt and trays, the two conveying wheels are jointly sleeved with the annular conveying chain belt, the multiple trays are horizontally connected to the conveying chain belt, and the sweeping assembly and the dust blowing assembly are arranged on the conveying chain belt. The sweeping assembly and the dust blowing assembly are sequentially arranged on the material conveying belt in the feeding direction of the material conveying belt, the sweeping assembly comprises a sweeping roller and a sweeping brush arranged on the sweeping roller, the sweeping brush is attached to the two opposite sides of the tray, the dust blowing assembly comprises a dust blowing frame, a dust blowing nozzle and a communicating branch pipe, and the dust blowing frame is arranged above the material conveying belt in a clamped mode; the multiple dust blowing nozzles are arranged on the dust blowing frame, and one dust blowing nozzle is arranged on each dust blowing nozzle in a communicating mode. The ice cream production device has the effects of improving the ice cream production efficiency and reducing the influence of impurities on ice cream production.

Description

Technical Field

[0001] This application relates to the technical field of ice cream production, and in particular to a tunnel-type constant temperature refrigeration device. Background Technology

[0002] Ice cream quick-freezing tunnels are primarily suitable for the mass production of irregularly shaped ice cream products in the frozen food industry. They feature four standard workstations, allowing for flexible and convenient production of various ice cream products such as stick-shaped ice cream, cake ice cream, cone ice cream, and cup ice cream. With a supporting robotic arm, chocolate can be applied to the surface of the stick-shaped products. Additional attachments can be added to the products for processes such as adding dried fruit and chocolate spraying. During ice cream production, while extrusion components extrude strips of ice cream, a single-arch component heated by electricity slices the strips. High-temperature metal wires cut the strips of ice cream into individual slices, achieving the segmentation of the ice cream.

[0003] Currently, ice cream is typically transported using a chain conveyor belt, with trays mounted on the belt for holding the ice cream. Regarding the aforementioned technology, the inventors believe that during the process of adding accessories or coatings to ice cream, some dried fruit, dust, icing, or chocolate may fall or freeze onto the trays, affecting subsequent ice cream transportation and processing. Summary of the Invention

[0004] In order to improve the production efficiency of ice cream and reduce the impact of impurities on ice cream production, this application provides a tunnel-type constant temperature refrigeration device.

[0005] The tunnel-type constant temperature refrigeration device provided in this application adopts the following technical solution: A tunnel-type constant-temperature refrigeration device includes a material conveyor belt, a cleaning assembly, and a dust blowing assembly. The material conveyor belt includes conveyor wheels, a conveyor chain, and trays. Two conveyor wheels are provided, and the annular conveyor chain is sleeved on both conveyor wheels. Several trays are horizontally connected to the conveyor chain. A drive source for driving the rotation of the conveyor wheels is connected to them. The cleaning assembly and the dust blowing assembly are sequentially arranged on the material conveyor belt along the feeding direction. The cleaning assembly includes a cleaning brush mounted on a cleaning roller. One roller is provided on each of the upper and lower sides of the material conveyor belt. The cleaning brush is attached to the opposite sides of the tray. The material conveyor belt is provided with a driving component for driving the cleaning roller to rotate. The dust blowing assembly includes a dust blowing frame, dust blowing nozzles, and a connecting branch pipe. The dust blowing frame is clamped above the material conveyor belt. Several dust blowing nozzles are provided on the dust blowing frame. One dust blowing nozzle is connected to each dust blowing nozzle. The opening end of the dust blowing nozzle extends towards the tray. The connecting branch pipe is connected to an air source.

[0006] Optionally, a scraping assembly is provided on the material conveyor belt. The scraping assembly is located on the side of the cleaning assembly away from the dust blowing assembly. The scraping assembly includes a rotating column and scraping grooves. The rotating column is arranged above the tray along the width direction of the material conveyor belt. A drive source for driving the rotating column to rotate is provided on the material conveyor belt. Several scraping grooves are arranged circumferentially on the rotating column. The length direction of the scraping grooves is parallel to the axial direction of the rotating column. A scraping opening is provided on the side of the scraping groove near the conveying direction of the material conveyor belt. When the scraping groove rotates with the rotating column to the lowest point, the side of the scraping opening is in contact with the top surface of the tray.

[0007] Optionally, a displacement slider is provided on the side of the scraper trough near the rotating column. A plurality of displacement grooves are formed along the axial direction of the rotating shaft. The plurality of displacement grooves correspond one-to-one with the plurality of displacement sliders and are slidably connected. An adjustment component is provided on the material conveyor belt for driving the displacement slider to slide in the displacement groove. A collection trough is provided on one side of the width direction of the material conveyor belt. The top end of the collection trough is open. The collection trough is located on one side of the rotating column. When the scraper trough is rotated to the position where the scraper opening faces downward, the scraper opening corresponds to the top opening of the collection trough.

[0008] Optionally, the adjusting component includes a guide post, a connecting rod, and a movable roller. The guide post is coaxially disposed at the end of the rotating post near the collection groove. A guide ring groove is provided on the peripheral wall of the guide post. The position of the guide ring groove closest to the rotating post is located on its bottom surface. The position of the guide ring groove farthest from the rotating post corresponds to the opening end of the collection groove. A connecting rod is connected to each scraping groove in the direction close to the guide post. The connecting rod is parallel to the length direction of the guide post. A movable roller is rotatably connected to the end of each connecting rod away from the scraping groove. The movable roller is slidably disposed in the guide ring groove.

[0009] Optionally, a slag-removing plate is provided on one side of the scraper trough near the guide post. The edge of the slag-removing plate is fitted against the inner wall of the scraper trough, and one side of the slag-removing plate is fixedly connected to the rotating post.

[0010] Optionally, a rubber guide plate is connected to the top edge of the collection trough near the guide post, and the rubber guide plate is made of an elastic material.

[0011] Optionally, the length direction of the dust blowing frame is set at an angle with the length direction of the material conveyor belt.

[0012] Optionally, a rubber scraper is connected to the edge of the scraper opening, an installation groove is provided on the edge of the scraper opening, and an installation block is provided on one side of the rubber scraper, the installation block being embedded in the corresponding installation groove.

[0013] In summary, this application includes at least one of the following beneficial technical effects: 1. During processing, empty pallets are transported by conveyor belt. As the pallets move to the cleaning assembly, the cleaning rollers rotate under the drive of the power source. Cleaning brushes mounted on the rollers sweep the surface of the pallets, removing adhering impurities to prevent them from affecting subsequent processing. After being swept, the pallets pass the dust blowing assembly. The air source is activated, and airflow is sprayed onto the pallets through connecting pipes and dust blowing nozzles, blowing off any remaining impurities and further improving the cleaning quality of the pallets. 2. The guide column and guide ring groove are designed to guide the scraper trough, which makes it easier for the scraper trough to move axially on the rotating column during the scraping process, reducing the possibility of impurities falling back onto the material conveyor belt during the feeding process. 3. The rubber scraper reduces the possibility of damage to the pallet caused by the opening of the scraper groove during the scraping process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the structure of a tunnel-type constant temperature refrigeration device according to an embodiment of this application.

[0015] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0016] Figure 3 This is a partial sectional view used in the embodiments of this application to illustrate the guide post and the rotating post.

[0017] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0018] Explanation of reference numerals in the attached drawings: 1. Material conveyor belt; 101. Pallet; 102. Conveyor chain; 103. Conveyor wheel; 104. Conveyor gearbox; 2. Quick-freezing machine; 3. Scraping assembly; 31. Rotating column; 311. Displacement chute; 32. Scraping groove; 321. Mounting groove; 33. Slag removal plate; 34. Rubber scraper; 341. Mounting block; 35. Connecting rod; 36. Limiting roller; 37. Guide column; 371. Guide ring groove; 38. Displacement slider; 4. Rubber guide plate; 5. Cleaning assembly; 51. Cleaning roller; 52. Cleaning brush; 53. Support plate; 6. Dust blowing assembly; 61. Dust blowing frame; 62. Dust blowing nozzle; 63. Connecting branch pipe; 64. Connecting manifold; 7. Collection trough. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-4 This application will be further described in detail below. Embodiments of this application provide a tunnel-type constant-temperature refrigeration device, which has the effect of improving the production efficiency of ice cream and reducing the impact of impurities on ice cream production.

[0020] Reference Figure 1 A tunnel-type constant-temperature refrigeration device includes a material conveyor belt 1, a quick-freezing machine 2, a scraping assembly 3, a cleaning assembly 5, and a dust blowing assembly 6. The material conveyor belt 1 includes a tray 101, a conveyor chain 102, conveyor wheels 103, and a conveyor reduction gearbox 104. Two conveyor wheels 103 are provided, with both wheels at the same height and their output shafts parallel. The annular conveyor chain 102 is simultaneously driven and sleeved around the two conveyor wheels 103. The conveyor wheels 103 are equipped with conveyor reduction gearboxes 104 for driving their rotation. Several trays 101 are horizontally arranged on the conveyor chain 102.

[0021] Reference Figure 1 The quick-freezing machine 2, scraping assembly 3, cleaning assembly 5, and dust blowing assembly 6 are sequentially arranged on the material conveyor belt 1 along its conveying direction. In this embodiment, the quick-freezing machine 2 is a tunnel-type quick-freezing machine 2. The quick-freezing machine 2 has an inlet and an outlet on opposite sides, and the tray 101 passes through the inlet and outlet of the quick-freezing machine 2.

[0022] Reference Figure 2-4The scraping assembly 3 includes a rotating column 31, a scraping groove 32, a slag-removing plate 33, a rubber scraper 34, a connecting rod 35, a limiting roller 36, and a guide column 37. The rotating column 31 is horizontally rotatably positioned above the material conveyor belt 1, with its axial direction parallel to the width direction of the material conveyor belt 1. A drive source for rotating the rotating column 31 is provided on the material conveyor belt 1. Several scraping grooves 32 are evenly spaced along the circumference of the rotating column 31, with their length direction parallel to the axial direction of the rotating column 31. A displacement slider 38 is connected to the side of the scraping groove 32 closest to the rotating column 31. The displacement slider 38 is a dovetail block. Several displacement grooves 311 are arranged along the axial direction of the rotating column 31, with the shapes of the displacement grooves 311 corresponding to those of the displacement sliders 38. The displacement sliders 38 and displacement grooves 311 correspond one-to-one and are slidably connected. A scraping opening is provided on the side of the scraping trough 32 closest to the conveying direction of the material conveyor belt 1. When the scraping trough 32 rotates to its lowest position with the rotating column 31, the side of the scraping opening is in contact with the top surface of the tray 101. The side of the scraping opening away from the connecting column is the scraping side, and an installation groove 321 is provided on the scraping side. A rubber scraper 34 is provided on the scraping side, and an installation block 341 is provided on the side of the rubber scraper 34 closest to the scraping side. The shape of the installation block 341 corresponds to the installation groove 321, and the installation block 341 is inserted into the corresponding installation groove 321. A slag cleaning plate 33 is provided in each scraping trough 32. The edge of the slag cleaning plate 33 is in contact with the inner wall of the scraping trough 32. The side of the slag cleaning plate 33 closest to the rotating column 31 is fixedly connected to the rotating column 31, and the slag cleaning plate 33 is located at the end of the rotating column 31 closest to the guide column.

[0023] Reference Figure 3 A guide post 37 is coaxially and horizontally disposed on one side of the rotating post 31. The diameter of the guide post 37 is smaller than the diameter of the rotating post 31. A guide ring groove 371 is provided circumferentially on the peripheral wall of the guide post 37. The guide ring groove 371 is closest to the rotating post 31 on the bottom surface of the guide post 37, and furthest from the rotating post 31 on the top surface of the guide post 37. A connecting rod 35 is connected to the side of the scraper groove 32 near the guide post 37. The end of the connecting rod 35 is rotatably connected to a limiting roller 36, which is rolled within the guide ring groove 371.

[0024] Reference Figure 2 A collection trough 7 with an open top is arranged parallel to one side of the rotating column 31. When the scraping trough 32 on the rotating column 31 rotates to correspond to the position of the collection trough 7, the open end of the scraping trough 32 is set downward and corresponds to the open end of the collection trough 7 in the vertical direction. A rubber guide plate 4 is inclinedly arranged on the top side of the collection trough 7 near the rotating column 31. The side of the rubber guide plate 4 away from the collection trough 7 extends inclined towards the rotating column 31.

[0025] Reference Figure 1 The cleaning assembly 5 includes a cleaning roller 51, a cleaning brush 52, and a support plate 53. The support plate 53 is vertically arranged on one side of the material conveyor belt 1. Two cleaning rollers 51 are horizontally and rotatably arranged on the support plate 53. The support plate 53 is provided with a drive source for driving the cleaning rollers 51 to rotate. The cleaning rollers 51 are arranged along the width direction of the material conveyor belt 1, and are respectively arranged on both sides of the material conveyor belt 1 in the vertical direction. The cleaning brush 52 is arranged on the cleaning roller 51. The dust blowing assembly 6 includes a dust blowing frame 61, a dust blowing nozzle 62, a connecting manifold 64, and a connecting branch pipe 63. The dust blowing frame 61 is connected to the top surface of the material conveyor belt 1. The length direction of the dust blowing frame 61 is arranged at an angle with the length direction of the material conveyor belt 1. Several connecting branch pipes 63 are vertically arranged on the dust blowing frame 61. The connecting manifold 64 is connected to the top of several connecting branch pipes 63. One dust blowing nozzle 62 is connected to the bottom end of each connecting branch pipe 63.

[0026] Reference Figure 1-3 Before cleaning, the tray 101 passes through the inlet and outlet of the quick-freezing machine 2. The quick-freezing machine 2 quickly freezes the impurities adhering to the tray 101, making it easier to scrape them off completely in subsequent processes. After the quick-freezing operation, the tray 101 passes the scraping assembly 3. The rotating column 31 rotates under the drive of the drive source, and the scraping groove 32 set on the rotating column 31 rotates accordingly. As the rotation proceeds, the limiting roller 36 connected to the scraping groove 32 slides in the guide ring groove 371 on the guide column 37. At this time, the displacement slider 38 moves in the displacement groove 311, and the limiting roller 36 drives the scraping groove 32 to move along the axial direction of the rotating shaft while rotating. When the scraping groove 32 rotates to the lowest point of the rotating column 31, the scraping groove 32 corresponds to the material conveyor belt 1 in the vertical direction, and the edge of the rubber scraper 34 contacts the tray 101. The impurities on the tray 101 are scraped off and enter the scraping groove 32 for temporary storage. The rubber scraper 34 reduces the likelihood of damage to the surface of the tray 101 during the scraping process. Combined with... Figure 4 The mounting block 341 and the mounting groove 321 enable the detachable connection between the rubber scraper 34 and the scraper groove 32, making it convenient for operators to replace the damaged rubber scraper 34.

[0027] Reference Figure 2When the scraper trough 32 rotates with the rotating column 31 to a position close to the collection trough 7, it moves to the end of the rotating column 31 closest to the guide column 37. At this time, the open end of the scraper trough 32 faces downward. Impurities scraped off in the scraper trough 32 fall into the collection trough 7 under gravity for collection. The rubber guide plate 4 guides the impurities, reducing the likelihood of impurities falling out of the collection trough 7 and ensuring that the scraper trough 32 does not interfere with the collection trough 7 during rotation, allowing it to rotate smoothly. Because the scraper trough 32 moves to a position close to the guide column 37 during material feeding, the possibility of impurities falling onto the material conveyor belt 1 during feeding is reduced.

[0028] Reference Figure 2 and Figure 3 After the scraper trough 32 has finished discharging, it continues to rotate with the rotating column 31. Guided by the guide ring groove 371 on the guide column 37, the scraper trough 32 moves back above the material conveyor belt 1 for the next round of scraping operation. As the scraper trough 32 moves along the circumference of the rotating column 31, the cleaning plate 33 slides relative to the inner wall of the scraper trough 32, scraping off the impurities adhering to it, reducing the possibility that the impurities adhering to the inner wall of the scraper trough 32 will affect the next round of scraping operation.

[0029] Reference Figure 1 After the scraping operation, the tray 101 moves to the position of the cleaning assembly 5. The cleaning roller 51 rotates under the drive of the drive unit, and the cleaning brush 52 sweeps away the residual waste on the tray 101, which helps to improve the cleaning quality of the tray 101. After the cleaning of the tray 101 is completed, the tray 101 moves to the position of the dust blowing assembly 6. The air source is activated, and dust is blown onto the tray 101 through the connecting manifold 64, the connecting branch pipe 63, and the dust blowing nozzle 62, to achieve further cleaning of the tray 101. Since the dust blowing frame 61 is set at an angle to the length direction of the material conveyor belt 1, the blowing time and distance of the airflow on the material conveyor belt 1 are extended, which helps to further improve the cleaning quality of the material conveyor belt 1.

[0030] The implementation principle of the tunnel-type constant temperature refrigeration device in this embodiment is as follows: Before cleaning the tray 101, the tray 101 passes through the inlet and outlet of the quick-freezing machine 2. The quick-freezing machine 2 quickly freezes the impurities on the tray 101, making it easier to scrape the impurities off completely in subsequent processes. The rotating column 31 rotates, and the scraping trough 32 rotates accordingly. The limiting roller 36 drives the scraping trough 32 to move axially along the rotating shaft while rotating. When the scraping trough 32 rotates to the lowest point of the rotating column 31, the impurities on the tray 101 are scraped off and temporarily stored in the scraping trough 32.

[0031] When the rotating column 31 rotates to a position close to the collecting trough 7, the scraper trough 32 moves to the end of the rotating column 31 closest to the guide column 37. At this time, the open end of the scraper trough 32 faces downward. Impurities scraped off in the scraper trough 32 fall into the collecting trough 7 under gravity for collection. The rubber guide plate 4 guides the impurities, reducing the likelihood of impurities falling out of the collecting trough 7 and ensuring that the scraper trough 32 does not interfere with the collecting trough 7 during rotation, allowing it to rotate smoothly. Because the scraper trough 32 moves to the end close to the guide column 37 during material feeding, the possibility of impurities falling onto the material conveyor belt 1 during feeding is reduced.

[0032] After the scraper trough 32 has finished discharging, it continues to rotate with the rotating column 31. Guided by the guide ring groove 371 on the guide column 37, the scraper trough 32 moves back above the material conveyor belt 1 for the next round of scraping operation. As the scraper trough 32 moves along the circumference of the rotating column 31, the cleaning plate 33 slides relative to the inner wall of the scraper trough 32, scraping off the impurities adhering to it, reducing the possibility that the impurities adhering to the inner wall of the scraper trough 32 will affect the next round of scraping operation.

[0033] After the scraping operation, the pallet 101 moves to the position of the cleaning assembly 5. The cleaning roller 51 rotates under the drive of the drive unit, and the cleaning brush 52 sweeps away the residual waste on the pallet 101, which helps to improve the cleaning quality of the pallet 101. After the cleaning of the pallet 101 is completed, the pallet 101 moves to the position of the dust blowing assembly 6. The air source is activated, and dust is blown onto the pallet 101 through the connecting manifold 64, the connecting branch pipe 63, and the dust blowing nozzle 62, to achieve further cleaning of the pallet 101. Since the dust blowing frame 61 is set at an angle to the length direction of the material conveyor belt 1, the blowing time and distance of the airflow on the material conveyor belt are extended, which helps to further improve the cleaning quality of the material conveyor belt 1.

[0034] 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 tunnel-type constant temperature refrigeration device, characterized in that: The system includes a material conveyor belt (1), a cleaning assembly (5), and a dust blowing assembly (6). The material conveyor belt (1) includes a conveyor wheel (103), a conveyor chain (102), and a tray (101). Two conveyor wheels (103) are provided, and the annular conveyor chain is sleeved on the outside of the two conveyor wheels (103). Several trays (101) are horizontally connected on the conveyor chain (102). A drive source for driving the rotation of the conveyor wheel (103) is connected to the conveyor wheel (103). The cleaning assembly (5) and the dust blowing assembly (6) are arranged sequentially on the material conveyor belt (1) along the feeding direction. The cleaning assembly (5) includes a cleaning roller (51) and a cleaning brush (52) disposed on it. The cleaning roller (51) is positioned on the material conveyor belt (1). The material conveyor belt (1) is provided with one cleaning brush (52) on both the upper and lower sides. The cleaning brush (52) is attached to the opposite sides of the tray (101). The material conveyor belt (1) is provided with a driving component for driving the cleaning roller (51) to rotate. The dust blowing assembly (6) includes a dust blowing frame (61), a dust blowing nozzle (62), and a connecting branch pipe (63). The dust blowing frame (61) is clamped above the material conveyor belt (1). Several dust blowing nozzles (62) are provided on the dust blowing frame (61). Each dust blowing nozzle (62) is connected to one. The opening end of the dust blowing nozzle (62) extends toward the tray (101). The connecting branch pipe (63) is connected to the air source.

2. The tunnel-type constant temperature refrigeration device according to claim 1, characterized in that: A scraping assembly (3) is provided on the material conveyor belt (1). The scraping assembly (3) is located on the side of the cleaning assembly (5) away from the dust blowing assembly (6). The scraping assembly (3) includes a rotating column (31) and a scraping groove (32). The rotating column (31) is located above the tray (101) along the width direction of the material conveyor belt (1). A drive source for driving the rotating column (31) to rotate is provided on the material conveyor belt (1). Several scraping grooves (32) are arranged circumferentially on the rotating column (31). The length direction of the scraping grooves (32) is parallel to the axial direction of the rotating column (31). A scraping opening is provided on the side of the scraping groove (32) near the conveying direction of the material conveyor belt (1). When the scraping groove (32) rotates with the rotating column (31) to the lowest point, the side of the scraping opening is attached to the top surface of the tray (101).

3. The tunnel-type constant temperature refrigeration device according to claim 2, characterized in that: A displacement slider (38) is provided on the side of the scraper trough (32) near the rotating column (31). A plurality of displacement grooves (311) are provided on the rotating shaft along its axial direction. The plurality of displacement grooves (311) correspond one-to-one with the plurality of displacement sliders (38) and are slidably connected. An adjustment component is provided on the material conveyor belt (1) for driving the displacement sliders (38) to slide in the displacement grooves (311). A collection trough (7) is provided on one side of the width direction of the material conveyor belt (1). The top of the collection trough (7) is open. The collection trough (7) is located on one side of the rotating column (31). When the scraper trough (32) rotates to the point where the scraper opening faces downward, the scraper opening corresponds to the top opening of the collection trough (7).

4. The tunnel-type constant temperature refrigeration device according to claim 3, characterized in that: The adjusting component includes a guide post (37), a connecting rod (35), and a movable roller. The guide post (37) is coaxially disposed at one end of the rotating post (31) near the collection groove (7). A guide ring groove (371) is provided on the peripheral wall of the guide post (37). The position of the guide ring groove (371) closest to the rotating post (31) is located on its bottom surface. The position of the guide ring groove (371) farthest from the rotating post (31) corresponds to the opening end of the collection groove (7). A connecting rod (35) is connected to each scraping groove (32) in the direction close to the guide post (37). The connecting rod (35) is arranged parallel to the length direction of the guide post (37). A movable roller is rotatably connected to one end of each connecting rod (35) away from the scraping groove (32). The movable roller is slidably disposed in the guide ring groove (371).

5. A tunnel-type constant temperature refrigeration device according to claim 3, characterized in that: A slag-cleaning plate (33) is provided on one side of the scraper trough (32) near the guide column (37). The edge of the slag-cleaning plate (33) is fitted against the inner wall of the scraper trough (32), and one side of the slag-cleaning plate (33) is fixedly connected to the rotating column (31).

6. A tunnel-type constant temperature refrigeration device according to claim 3, characterized in that: The top edge of the collection trough (7) near the guide post (37) is connected to a rubber guide plate (4), which is made of elastic material.

7. A tunnel-type constant temperature refrigeration device according to claim 1, characterized in that: The length direction of the dust blower (61) is set at an angle with the length direction of the material conveyor belt (1).

8. A tunnel-type constant temperature refrigeration device according to claim 2, characterized in that: A rubber scraper (34) is connected to the edge of the scraper opening. An installation groove (321) is provided on the edge of the scraper opening. An installation block (341) is provided on one side of the rubber scraper (34). The installation block (341) is embedded in the corresponding installation groove (321).

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