A construction engineering drainage device

Abstract

The application belongs to the technical field of drainage equipment, and particularly relates to a construction engineering drainage equipment, which comprises a drainage pump, a drainage tank arranged on the top of the drainage pump, a drainage groove arranged on one side of the drainage tank close to a water inlet pipe of the drainage pump, a filter frame slidably connected in the drainage tank, filter holes arranged on one end of the filter frame close to the drainage groove, and an odor absorption assembly arranged on one side of the drainage tank away from the drainage groove. The odor absorption assembly is arranged, the drainage pipe is communicated with the odor absorption assembly through the drainage groove when wastewater is not discharged or after the wastewater is discharged, the activated carbon in the odor removal box is beneficial to absorbing and removing the odor volatilized in the sewer, the filter frame is pressed down by the wastewater when the wastewater is discharged, the filter frame seals the exhaust hole, the activated carbon is stirred by the stirring mechanism, the activated carbon is prevented from caking, and the absorption performance of the activated carbon to the odor is maintained.

Description

Technical Field

[0001] This invention belongs to the field of drainage equipment technology, specifically a drainage equipment for building engineering. Background Technology

[0002] Construction engineering refers to the physical engineering project formed by the construction of various types of buildings and their ancillary facilities, as well as the installation of supporting lines, pipelines, and equipment.

[0003] Currently, in building construction, wastewater is generally discharged directly into the sewer system, or it is pumped into the sewer system.

[0004] Currently, during the process of pumping wastewater into the sewer, on the one hand, solids in the wastewater will enter the drainage pump's pipes along with the wastewater, which can easily cause blockages. On the other hand, after drainage, odors from the pipes will spread to the outside, affecting air quality.

[0005] Therefore, the present invention provides a drainage device for building engineering. Summary of the Invention

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

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The building engineering drainage equipment of the present invention includes a drainage pump, a drainage tank is provided on the top of the drainage pump, a drainage trough is provided on the side of the drainage tank near the water inlet pipe of the drainage pump, a filter frame is slidably connected inside the drainage tank, a filter hole is provided at the end of the filter frame near the drainage trough, a diversion plate is fixedly connected to the bottom surface of the end of the filter frame near the filter hole, the diversion plate is slidably connected inside the drainage trough, an elastic support component is provided at the bottom of the filter frame for supporting the filter frame, a drainage pipe is fixedly connected to the side wall of the drainage tank on the same side as the drainage trough, the bottom of the drainage pipe is connected to the water inlet pipe of the drainage pump, and an odor absorption component is provided on the side of the drainage tank away from the drainage trough.

[0008] Preferably, the elastic support assembly includes four support rods, all of which are fixedly connected to the bottom of the drainage tank. Each of the four support rods has a sleeve fitted on its top, and the top of the sleeve is fixedly connected to the bottom of the filter frame. A spring is fixedly connected to the top surface of the support rod, and the end of the spring away from the support rod is fixedly connected inside the sleeve.

[0009] Preferably, the odor absorption component includes an exhaust port, which is opened through the drain tank on the side away from the drain trough. An odor removal box is fixedly connected to the exhaust port of the drain tank and communicates with the exhaust port. A mesh plate is fixedly connected inside the odor removal box, and activated carbon is placed on the upper part of the mesh plate. The top of the odor removal box is mesh-shaped, and an actuating mechanism is provided on the odor removal box for actuating the activated carbon.

[0010] Preferably, the actuating mechanism includes two sliding grooves and a movable plate. The two sliding grooves are symmetrically opened on the side of the drain box away from the drain channel. A sliding plate is slidably connected in each of the two sliding grooves. The bottom of the sliding plate is fixedly connected to the side wall of the filter frame. The movable plate is slidably connected in the deodorizing box. A pushing member is provided on the top of the deodorizing box. The pushing member is used to push the movable plate.

[0011] Preferably, the pushing member includes a guide groove and a guide rod. The guide groove includes a vertical groove and an inclined groove. The guide rod is fixedly connected to the top of the moving plate, and the end of the guide rod away from the moving plate is slidably connected in the inclined groove.

[0012] Preferably, two side plates are symmetrically fixedly connected to the side wall of the drainage channel, and the height of the side plates is the same as the width of the drainage channel.

[0013] Preferably, the bottom of the drainage channel is provided with a sliding groove, a sealing plate is slidably connected in the sliding groove, the bottom of the sealing plate is provided with an exhaust groove, and four springs are fixedly connected to the bottom surface of the sealing plate, with the ends of the four springs away from the sealing plate fixedly connected to the bottom of the sliding groove.

[0014] Preferably, a cylinder is fixedly connected to the top side wall of the drainage tank. The telescopic rod of the cylinder passes through the side wall of the drainage tank and is fixedly connected to a mounting bracket. A scraper is slidably connected inside the mounting bracket. Two springs are symmetrically fixedly connected to the top of the mounting bracket. The ends of the two springs away from the mounting bracket are fixedly connected to the top of the scraper.

[0015] Preferably, the upper end of the drainage box is provided with symmetrical discharge troughs on both sides, and a collection box is fixedly connected to the surface of the discharge trough.

[0016] Preferably, the surface of the filter frame is provided with multiple arc-shaped grooves, and the bottom surface of the scraper is provided with multiple sets of protrusions that are adapted to the arc-shaped grooves.

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

[0018] The present invention discloses a building wastewater drainage device. By setting up a filter frame, during the discharge of building wastewater, the wastewater is first discharged into a drainage tank. The wastewater presses down on the filter frame, so that the filter holes are connected to the drainage trough. Solid particles in the wastewater remain on the filter frame. The wastewater passes through the filter holes into the drainage trough and then into the drainage pipe. It is then discharged into the sewer by a drainage pump. This device facilitates solid-liquid separation of wastewater and helps to prevent solid components in the wastewater from clogging or damaging the drainage pump and pipes.

[0019] The present invention discloses a building drainage device, which incorporates an odor absorption component. Before or after wastewater discharge, the drain pipe connects to the odor absorption component via a drainage channel. The activated carbon in the odor removal box effectively absorbs and removes odors volatile in the sewer. During wastewater discharge, the wastewater presses down on the filter frame, which blocks the vent and simultaneously activates a mechanism to move the activated carbon, preventing clumping and maintaining its odor absorption performance. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a schematic diagram of the drainage tank of the present invention;

[0023] Figure 3 This is a schematic diagram of a partial structural breakdown of the drainage pipe of the present invention. Figure 1 ;

[0024] Figure 4 This is a partial structural cross-sectional diagram of the drainage tank of the present invention;

[0025] Figure 5 This is a partial structural diagram of the drainage tank of the present invention;

[0026] Figure 6 This is a schematic diagram of the filter frame of the present invention;

[0027] Figure 7 This is a schematic diagram of a partial structural breakdown of the drainage pipe in this invention. Figure 2 .

[0028] In the diagram: 1. Drain pump; 2. Drain tank; 3. Drain pipe; 4. Filter frame; 5. Filter hole; 6. Drain trough; 7. Sleeve; 8. Support rod; 9. Drainage plate; 10. Side plate; 11. Slide 1; 12. Sealing plate; 13. Exhaust trough; 14. Spring 1; 16. Exhaust hole; 17. Deodorizing box; 18. Mesh plate; 19. Moving plate; 20. Slide 2; 21. Sliding plate; 22. Guide groove; 23. Guide rod; 24. Cylinder; 25. Mounting bracket; 26. Scraper; 27. Spring 2; 28. Discharge trough; 29. ​​Collection box; 30. Arc-shaped groove. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] Combination Figure 1 , Figure 2 and Figure 6 As shown in the embodiment of the present invention, a building wastewater drainage device includes a drainage pump 1, a drainage tank 2 on the top of the drainage pump 1, a drainage trough 6 on the side of the drainage tank 2 near the inlet pipe of the drainage pump 1, a filter frame 4 slidably connected inside the drainage tank 2, a filter hole 5 on one end of the filter frame 4 near the drainage trough 6, a diversion plate 9 fixedly connected to the bottom surface of the end of the filter frame 4 near the filter hole 5, the diversion plate 9 slidably connected inside the drainage trough 6, an elastic support assembly for supporting the filter frame 4 on the bottom, a drainage pipe 3 fixedly connected to the side wall of the drainage tank 2 on the same side as the drainage trough 6, the bottom of the drainage pipe 3 communicating with the inlet pipe of the drainage pump 1, and an odor absorption assembly on the side of the drainage tank 2 away from the drainage trough 6. During operation, when treating building wastewater, before the wastewater flows into the drainage tank 2, the elastic support assembly supports the filter frame 4, so that the filter hole 5 is not connected to the drainage trough 6, and the drainage pipe 3 flows through the drainage trough 6. Connected to the odor absorption component, odors from the sewer enter the odor absorption component through the drain pump 1, drain pipe 3, drain trough 6, and filter frame 4. This helps to absorb and remove odors volatile in the sewer, preventing them from spreading into the air and affecting air quality. During the discharge of construction wastewater, the wastewater is first discharged into the drain tank 2. The wastewater presses down on the filter frame 4, connecting the filter holes 5 with the drain trough 6. Solid particles in the wastewater remain on the filter frame 4. The wastewater then passes through the filter holes 5 into the drain trough 6 and then into the drain pipe 3. It is then discharged into the sewer by the drain pump 1. This process facilitates solid-liquid separation of the wastewater, preventing solid components in the wastewater from clogging or damaging the drain pump 1 and pipes. After the construction wastewater is discharged, the elastic support component holds the filter frame 4 back to its initial state. The drain pipe 3 then reconnects to the odor absorption component through the drain trough 6, allowing for continued absorption and removal of odors from the sewer.

[0031] Combination Figure 4 and Figure 6 As shown, the elastic support assembly includes four support rods 8, all of which are fixedly connected to the bottom of the drain tank 2. Each of the four support rods 8 has a sleeve 7 fitted onto its top. The top of the sleeve 7 is fixedly connected to the bottom of the filter frame 4. A spring is fixedly connected to the top surface of each support rod 8, with the end of the spring away from the support rod 8 fixedly connected inside the sleeve 7. During operation, the spring on the support rod 8 supports the sleeve 7, causing the sleeve 7 to support the filter frame 4. This makes the bottom of the filter frame 4 higher than the top of the drain trough 6, which helps to separate the filter holes 5 from the drain trough 6. This helps to prevent odors from the sewer from being discharged into the outside environment through the drain trough 6 and filter holes 5 when the filter frame 4 is not in use, thus avoiding impact on the air quality.

[0032] Combination Figures 4 to 7As shown, the odor absorption component includes an exhaust port 16, which is located on the side of the drain tank 2 away from the drain trough 6. An odor removal box 17 is fixedly connected to the exhaust port 16 of the drain tank 2, and the odor removal box 17 communicates with the exhaust port 16. A mesh plate 18 is fixedly connected inside the odor removal box 17, and activated carbon is placed on the upper part of the mesh plate 18. The top of the odor removal box 17 is mesh-like, and a toggle mechanism is provided on the odor removal box 17 to move the activated carbon. During operation, before or after wastewater discharge, the drain pipe 3 is connected to the odor absorption component through the drain trough 6. The activated carbon in the odor removal box 17 helps to absorb and remove odors volatilized in the sewer. When wastewater is discharged, the wastewater presses down on the filter frame 4, which blocks the exhaust port 16 and simultaneously drives the toggle mechanism to move the activated carbon, which helps to prevent the activated carbon from clumping and maintain the odor absorption performance of the activated carbon.

[0033] Combination Figures 5 to 7 As shown, the actuating mechanism includes two sliding grooves 20 and a movable plate 19. The two sliding grooves 20 are symmetrically opened on the side of the drainage box 2 away from the drainage trough 6. Sliding plates 21 are slidably connected in both sliding grooves 20. The bottom of the sliding plate 21 is fixedly connected to the side wall of the filter frame 4. The movable plate 19 is slidably connected in the deodorizing box 17. A pushing member is provided on the top of the deodorizing box 17, which is used to push the movable plate 19. During operation, when wastewater is discharged, the wastewater presses down on the filter frame 4, and the filter frame 4 drives the sliding plate 21 to descend. The sliding plate 21 pushes the movable plate 19 to move through the pushing member. This facilitates the movable plate 19 to move the activated carbon on the top of the mesh plate 18, which helps to prevent the activated carbon from clumping and helps to maintain the odor absorption performance of the activated carbon.

[0034] Combination Figure 5 and Figure 6 As shown, the pushing component includes a guide groove 22 and a guide rod 23. The guide groove 22 includes a vertical groove and an inclined groove. The guide rod 23 is fixedly connected to the top of the moving plate 19, and the end of the guide rod 23 away from the moving plate 19 is slidably connected in the inclined groove. During operation, when wastewater is discharged, the wastewater presses down on the filter frame 4, and the filter frame 4 drives the sliding plate 21 to descend. The upper inclined groove of the sliding plate 21 squeezes the guide rod 23, so that the guide rod 23 pushes the moving plate 19 to move, which is beneficial for the moving plate 19 to move the activated carbon on the mesh plate 18.

[0035] Combination Figure 3 As shown, two side plates 10 are symmetrically fixedly connected to the side wall of the drainage trough 6. The height of the side plates 10 is the same as the width of the drainage trough 6. During operation, when the wastewater is discharged through the filter hole 5, the wastewater is guided into the drain pipe 3 through the diversion plate 9. The side plates 10 help to prevent the wastewater from flowing into the drainage trough 6 from both ends of the diversion plate 9 and entering the bottom of the drainage tank 2 to remain.

[0036] Combination Figure 4 and Figure 7 As shown, the bottom of the drainage trough 6 has a sliding groove 11, and a sealing plate 12 is slidably connected inside the sliding groove 11. The bottom of the sealing plate 12 has an exhaust vent 13, and four springs 14 are fixedly connected to the bottom surface of the sealing plate 12. The ends of the four springs 14 furthest from the sealing plate 12 are fixedly connected to the bottom of the sliding groove 11. During operation, when wastewater is not being discharged or after wastewater discharge, the springs 14 hold the sealing plate 12 in place, and the exhaust vent 13 is higher than the bottom of the drainage trough 6. The drain pipe 3 is connected to the drain box. The internal connection of 2 facilitates the entry of odors and biogas from the sewer into the drainage tank 2 through the exhaust duct 13 and then into the deodorizing box 17 through the exhaust hole 16. This facilitates the absorption of odors, the emission of biogas, and the prevention of biogas accumulation in the sewer. During the wastewater discharge process, the descent of the filter frame 4 will cause the sealing plate 12 to descend, which facilitates the storage of the exhaust duct 13 in the slide 11. This also helps to prevent wastewater from flowing into the drain pipe 3 and then into the drainage tank 2 through the drainage duct 6.

[0037] Combination Figures 2 to 6 As shown, a cylinder 24 is fixedly connected to the top side wall of the drainage tank 2. The telescopic rod of the cylinder 24 passes through the side wall of the drainage tank 2 and is fixedly connected to a mounting bracket 25. A scraper 26 is slidably connected inside the mounting bracket 25. Two springs 27 are symmetrically fixedly connected to the top of the mounting bracket 25. The ends of the two springs 27 away from the mounting bracket 25 are fixedly connected to the top of the scraper 26. During operation, solids in the wastewater remain on the filter frame 4. By starting the cylinder 24, the telescopic rod of the cylinder 24 drives the scraper 26 to reciprocate through the mounting bracket 25. This helps to clean the solids on the surface of the filter frame 4 and the solids at the filter holes 5, which helps to prevent solids from accumulating and clogging the filter holes 5. The setting of the springs 27 helps to push the scraper 26 down during the descent of the filter frame 4, so that the scraper 26 is always in contact with the surface of the filter frame 4. This helps to push the fixed parts on the filter frame 4 to both sides of the drainage tank 2 during the wastewater discharge process.

[0038] Combination Figure 4 and Figure 5As shown, discharge troughs 28 are symmetrically provided on both sides of the upper end of the drainage tank 2, and a collection box 29 is fixedly connected to the surface of the discharge troughs 28. During operation, when the filter frame 4 is in the initial state, the bottom surface of the filter frame 4 is flush with the discharge trough 28. During the drainage process, the filter frame 4 is pressed down. During the drainage process, the telescopic rod of the cylinder 24 drives the scraper 26 to reciprocate through the mounting bracket 25, pushing the solids on the filter frame 4 to the inner wall of the drainage tank 2. After the drainage is completed, as the filter frame 4 rises back to the initial state, it will drive the solids on the inner wall of the drainage tank 2 to rise to the discharge trough 28. When the cylinder 24 is started again, the scraper 26 can push the solids from the discharge trough 28 into the collection box 29. When it is necessary to clean the solids in the collection box 29, the end caps at both ends of the collection box 29 can be opened.

[0039] Combination Figure 4 and Figure 6 As shown, the surface of the filter frame 4 is provided with multiple arc-shaped grooves 30, and the bottom surface of the scraper 26 is provided with multiple sets of protrusions that are adapted to the arc-shaped grooves 30. During operation, the arc-shaped grooves 30 help to intercept solids in the wastewater and reduce the accumulation of solids in the wastewater at the filter holes 5, which would clog the filter holes 5. The protrusions help to clean the solids in the arc-shaped grooves 30.

[0040] Working principle:

[0041] During the treatment of construction wastewater, before the wastewater flows into the drainage tank 2, the spring on the support rod 8 holds the sleeve 7, causing the sleeve 7 to hold the filter frame 4. This makes the bottom of the filter frame 4 higher than the top of the drainage trough 6, which helps to separate the filter hole 5 from the drainage trough 6. The drain pipe 3 is connected to the deodorizing box 17 through the drainage trough 6. The activated carbon in the deodorizing box 17 helps to absorb and remove odors volatilized in the sewer.

[0042] During the discharge of construction wastewater, the wastewater presses down on the filter frame 4, which blocks the exhaust port 16. Simultaneously, the filter frame 4 activates a moving mechanism to agitate the activated carbon, preventing clumping and maintaining its odor absorption performance.

[0043] During the discharge of construction wastewater, the wastewater is first discharged into the drainage tank 2. The wastewater presses down on the filter frame 4, connecting the filter holes 5 with the drainage trough 6. Solid particles in the wastewater remain on the filter frame 4. The wastewater then passes through the filter holes 5 into the drainage trough 6 and then into the drainage pipe 3. Finally, it is discharged into the sewer system by the drainage pump 1. This process facilitates solid-liquid separation of the wastewater and helps prevent solid components in the wastewater from clogging or damaging the drainage pump 1 and the pipes.

[0044] During the discharge process of wastewater through filter holes 5, the wastewater is guided into the drain pipe 3 by the diversion plate 9. The side plate 10 helps to prevent wastewater from flowing into the drain trough 6 from both ends of the diversion plate 9 and remaining at the bottom of the drain tank 2.

[0045] Before or after wastewater discharge, spring 14 holds the sealing plate 12, the exhaust trough 13 is higher than the bottom of the drainage trough 6, and the drain pipe 3 is connected to the inside of the drainage tank 2. This allows odors and biogas in the sewer to enter the drainage tank 2 through the exhaust trough 13 and then enter the deodorizing box 17 through the exhaust hole 16. This helps to absorb odors, facilitates the emission of biogas, and prevents biogas from accumulating in the sewer. During wastewater discharge, the descent of the filter frame 4 will cause the sealing plate 12 to descend, which helps the exhaust trough 13 to be stored in the slide trough 11. This helps to prevent wastewater from flowing into the drain pipe 3 and then into the drainage tank 2 through the drainage trough 6.

[0046] After the drainage is completed, as the filter frame 4 rises back to its initial state, it will cause the solids on the inner wall of the drainage tank 2 to rise to the discharge trough 28. When the cylinder 24 is activated, the scraper 26 can push the solids and residual sewage on the filter frame 4 into the collection box 29. When it is necessary to clean the solids in the collection box 29, simply open the end caps at both ends of the collection box 29.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drainage device for building engineering, characterized in that: The system includes a drainage pump (1), a drainage tank (2) on the top of the drainage pump (1), a drainage trough (6) on the side of the drainage tank (2) near the water inlet pipe of the drainage pump (1), a filter frame (4) slidably connected inside the drainage tank (2), a filter hole (5) on the end of the filter frame (4) near the drainage trough (6), a diversion plate (9) fixedly connected to the bottom surface of the end of the filter frame (4) near the filter hole (5), the diversion plate (9) slidably connected inside the drainage trough (6), an elastic support component for supporting the filter frame (4) is provided at the bottom of the filter frame (4), a drainage pipe (3) is fixedly connected to the side wall of the drainage tank (2) on the same side as the drainage trough (6), the bottom of the drainage pipe (3) is connected to the water inlet pipe of the drainage pump (1), and an odor absorption component is provided on the side of the drainage tank (2) away from the drainage trough (6). The odor absorption assembly includes an exhaust port (16), which is located on the side of the drain tank (2) away from the drain trough (6). An odor removal box (17) is fixedly connected to the exhaust port (16) of the drain tank (2), communicating with the exhaust port (16). A mesh plate (18) is fixedly connected inside the odor removal box (17), with activated carbon placed on the upper part of the mesh plate (18). The top of the odor removal box (17) is mesh-like, and a toggle mechanism is provided on the odor removal box (17). The toggle mechanism is used for... The activated carbon is agitated. The agitation mechanism includes two slide grooves (20) and a movable plate (19). The two slide grooves (20) are symmetrically opened on the side of the drain box (2) away from the drain groove (6). Sliding plates (21) are slidably connected in both slide grooves (20). The bottom of the sliding plate (21) is fixedly connected to the side wall of the filter frame (4). The movable plate (19) is slidably connected in the deodorizing box (17). A pusher is provided on the top of the deodorizing box (17). The pusher is used to push the movable plate (19).

2. The building drainage equipment according to claim 1, characterized in that: The elastic support assembly includes four support rods (8), all of which are fixedly connected to the bottom of the drainage tank (2). Each of the four support rods (8) is fitted with a sleeve (7), the top of which is fixedly connected to the bottom of the filter frame (4). A spring is fixedly connected to the top surface of the support rod (8), and the end of the spring away from the support rod (8) is fixedly connected inside the sleeve (7).

3. A building drainage device according to claim 1, characterized in that: The pusher includes a guide groove (22) and a guide rod (23). The guide groove (22) is disposed on the sliding plate (21). The guide groove (22) includes a vertical groove and an inclined groove. The guide rod (23) is fixedly connected to the top of the moving plate (19). The end of the guide rod (23) away from the moving plate (19) is slidably connected in the inclined groove.

4. A building drainage device according to claim 3, characterized in that: Two side plates (10) are symmetrically fixedly connected to the side wall of the drainage trough (6), and the height of the side plates (10) is the same as the width of the drainage trough (6).

5. A building drainage device according to claim 4, characterized in that: The bottom of the drainage channel (6) is provided with a sliding groove (11), and a sealing plate (12) is slidably connected in the sliding groove (11). The bottom of the sealing plate (12) is provided with an exhaust groove (13). Four springs (14) are fixedly connected to the bottom surface of the sealing plate (12). The ends of the four springs (14) away from the sealing plate (12) are fixedly connected to the bottom of the sliding groove (11).

6. A building drainage device according to claim 5, characterized in that: A cylinder (24) is fixedly connected to the top side wall of the drainage tank (2). The telescopic rod of the cylinder (24) passes through the side wall of the drainage tank (2) and is fixedly connected to a mounting bracket (25). A scraper (26) is slidably connected inside the mounting bracket (25). Two springs (27) are symmetrically fixedly connected to the top of the mounting bracket (25). The ends of the two springs (27) away from the mounting bracket (25) are fixedly connected to the top of the scraper (26).

7. A building drainage device according to claim 6, characterized in that: The upper end of the drainage tank (2) is symmetrically provided with discharge troughs (28), and a collection box (29) is fixedly connected to the surface of the discharge troughs (28).

8. A building drainage device according to claim 7, characterized in that: The surface of the filter frame (4) is provided with multiple arc-shaped grooves (30), and the bottom surface of the scraper (26) is provided with multiple sets of protrusions that are compatible with the arc-shaped grooves (30).

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