Tooth rake of rotary trash remover and rotary trash remover with tooth rake

Abstract

The utility model provides a tooth harrow of a rotary trash remover and the rotary trash remover with the tooth harrow. The tooth harrow comprises a plurality of harrow teeth, a harrow tooth shaft and an anti-twisting plate, each rake tooth is provided with an annular body, dirt lifting teeth and dirt shoveling teeth are arranged on the outer side face of each annular body, and the included angle between the axis of each dirt shoveling tooth and the axis of each dirt lifting tooth is 90-150 degrees; the bottoms of the dirt shoveling teeth and the dirt lifting teeth are each provided with an anti-twisting groove communicated with an inner cavity of the annular body. The whole rake tooth shaft is cylindrical, and two anti-twisting plates with the same length as the rake tooth shaft are arranged on the outer side of the rake tooth shaft; the rake tooth shaft is sleeved with the circular body of the rake tooth, and the anti-twisting plate is sleeved with the anti-twisting groove. The tooth rake of the rotary trash remover can be integrally cut by laser, so that the processing is fast; the rake teeth are arranged on the rake tooth shaft in a sleeving mode. The rake tooth shaft does not need to be punched, so that the stress is not influenced; and if a certain rake tooth is damaged, the rake tooth can be replaced by a new rake tooth after being dismounted, so that the maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy machinery, in particular to a tooth rake of a rotary trash cleaner and a rotary trash cleaner with the tooth rake. Background Art

[0002] A rotary trash cleaner is an automatic sewage treatment device, mainly used to remove large suspended solids and floating objects in sewage to protect the normal operation of subsequent process equipment and reduce the treatment load. It is widely used in sewage treatment facilities such as municipal and industrial ones, such as water intake pump stations for water supply, rainwater and sewage pump stations, urban flood control and drainage pump stations, intake pump stations of sewage treatment plants, cooling water intake ports of power plants, etc. It has the characteristics of high automation, high dirt separation efficiency, low power consumption, low working noise, and good corrosion resistance. A rotary trash cleaner mainly consists of a frame, a main grid, a trash cleaning tooth rake, a lifting chain, a motor reduction drive device, etc. During operation, the trash cleaning rake plate is driven by the drive device to pick up the dirt intercepted by the underwater grid part (bottom grid), and then rely on the two-sided lifting chain to rotate clockwise synchronously from behind the main grid to in front of the main grid. After the rake plate reaches the highest point of the main grid, it flips, and the dirt can fall by gravity or be discharged through other means to achieve the purpose of decontamination.

[0003] The tooth rake is in direct contact with the dirt and is driven by the drive mechanism to move continuously, and it is a vulnerable part in the trash cleaner. The existing tooth rakes mainly have two forms. One is to directly weld the rake teeth on the tooth rake shaft; the other is to slot the tooth rake shaft and insert the rake teeth into the tooth rake shaft. The first method is relatively difficult to manufacture, and it is difficult to guarantee the processing accuracy, and it is easy to be damaged. Moreover, when the rake teeth are damaged, the tooth rake needs to be removed and transported to a special welding workshop for repair; the second method of slotting the tooth rake shaft will affect the stress of the tooth rake shaft, resulting in a reduced service life of the tooth rake shaft, and it is also more troublesome to repair when the rake teeth are damaged. Summary of the Utility Model

[0004] The utility model provides a tooth rake of a rotary trash cleaner and a rotary trash cleaner with the tooth rake to solve at least one of the above problems.

[0005] According to one aspect of the utility model, a tooth rake of a rotary trash cleaner is provided, which includes a plurality of rake teeth, a tooth rake shaft, and an anti-torsion plate; the rake teeth have an annular body, the outer side of the annular body is provided with lifting dirt teeth and shoveling dirt teeth, and the included angle between the axes of the shoveling dirt teeth and the lifting dirt teeth is 90 - 150°; each of the bottom of the shoveling dirt teeth and the lifting dirt teeth is provided with an anti-torsion groove communicating with the inner cavity of the annular body; the tooth rake shaft is in a cylindrical shape as a whole, and two anti-torsion plates equivalent to the length of the tooth rake shaft are arranged on the outer side of the tooth rake shaft; the annular body of the rake teeth is sleeved on the tooth rake shaft, and the anti-torsion groove is sleeved on the anti-torsion plate.

[0006] The rake teeth of the rotary dirt cleaner of the present utility model can be integrally cut by laser, with fast processing; the rake teeth are sleeved on the rake tooth shaft, and the installation method; there is no need to drill holes on the rake tooth shaft, which will not affect its stress; if a certain rake tooth is damaged, only need to remove it and replace it with a new rake tooth, which is convenient for maintenance.

[0007] In some embodiments, positioning shaft holes are respectively arranged above the anti-twist grooves of the dirt-lifting teeth and the dirt-shoveling teeth of the present utility model; the positioning sleeve shaft is penetrated through the positioning shaft holes; positioning sleeves are sleeved between adjacent rake teeth on the positioning sleeve shaft. The setting of the positioning sleeve can fix the position of the rake teeth, and it is also convenient for positioning the rake teeth during installation.

[0008] In some embodiments, the diameter of the positioning sleeve arranged between the dirt-shoveling teeth of the rake teeth at the outermost edge of the rake tooth shaft of the present utility model is larger than that of the positioning sleeve between the dirt-shoveling teeth in the middle of the rake tooth shaft. In this way, when the rake teeth contact the auxiliary grating, the positioning sleeve arranged between the dirt-shoveling teeth of the rake teeth at the outermost edge of the rake tooth shaft will contact the auxiliary grating bars, while the positioning sleeve in the middle of the rake tooth shaft will not contact the auxiliary grating bars. The positioning sleeve at the edge of the rake tooth shaft is convenient to replace after being worn, and this setting can prevent the positioning sleeve in the middle of the rake tooth shaft from being worn.

[0009] In some embodiments, external threads are provided at both ends of the positioning sleeve shaft of the present utility model, and the rake teeth and the positioning sleeve are clamped by screwing two nuts from both ends.

[0010] In some embodiments, detachable end plates are respectively provided at both ends of the rake tooth shaft of the present utility model. The rake tooth shaft end plate is set to be detachably connected, which is convenient for maintenance and replacement when the rake teeth are damaged.

[0011] In some embodiments, the end plate and the rake tooth shaft of the present utility model are connected by double-headed bolts. Using double-headed bolts for connection can prevent the screws from being damaged.

[0012] In some embodiments, rollers are provided on the outer side surface of the end plate of the present utility model. Setting pulleys at both ends of the rake teeth can prevent the situation that the operation of the dirt cleaner is blocked due to the deflection of the rake teeth.

[0013] In some embodiments, a shaft-stopping surface perpendicular to the end surface is provided on the end surface of the roller shaft of the roller of the present utility model, and the shaft-stopping surface abuts against the end plate.

[0014] In some embodiments, the included angle between the axes of the dirt-shoveling teeth and the dirt-lifting teeth of the present utility model is 120°.

[0015] According to another aspect of the present utility model, a rotary dirt cleaner is further provided, which includes the rake teeth of the above-mentioned rotary dirt cleaner. Description of the Drawings

[0016] Figure 1Schematic structural diagram of the rake of a rotary sewage cleaner in the prior art;

[0017] Figure 2 Schematic structural diagram of the rake of a rotary sewage cleaner according to an embodiment of the present invention;

[0018] Figure 3 For Figure 2 Enlarged schematic diagram at position A in

[0019] Figure 4 For Figure 3 Partial exploded structural diagram of the rake shown in

[0020] Figure 5 For Figure 2 Schematic structural diagram of the integral rake teeth of the rake shown in

[0021] Figure 6 For Figure 3 Schematic structural diagram of the roller shaft shown in

[0022] Figure 7 Schematic structural diagram of a rotary sewage cleaner according to an embodiment of the present invention;

[0023] Figure 8 For Figure 7 Schematic structural diagram of the rotary anti-leakage sewage cleaner shown in observed from another angle;

[0024] Figure 9 Schematic structural diagram of the secondary grid of a rotary anti-leakage sewage cleaner according to an embodiment of the present invention;

[0025] Figure 10 Partial structural diagram of a rotary anti-leakage sewage cleaner according to an embodiment of the present invention;

[0026] Figure 11 For Figure 10 Schematic diagram of the state when the rake of the rotary anti-leakage sewage cleaner contacts the secondary grid shown in ;

[0027] Figure 12 For Figure 10 Schematic diagram of the state of the buffer device after the rake of the rotary anti-leakage sewage cleaner leaves the secondary grid shown in ;

[0028] Figure 13 For Figure 10 Partial structural diagram of the buffer device of the rotary anti-leakage sewage cleaner shown in . Specific embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0030] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0031] Finally, it should also be noted that in this text, relational terms such as first and second, counterclockwise and clockwise, forward and reverse are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising" and "including", not only include those elements, but also include other elements not explicitly listed, or also include elements inherent to such a process, method, article, or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of other identical elements in the process, method, article, or device including the said elements.

[0032] The following will further describe the present utility model in detail with reference to the accompanying drawings.

[0033] Figures 2 - 6 Schematically shows the structure of the rake teeth of a rotary anti-leakage and pollution cleaning machine according to an embodiment of the present utility model.

[0034] Refer to Figures 2 - 6 As shown, the rake teeth 30 include a plurality of rake teeth 31, a rake tooth shaft 35, end plates 32, rollers 33, anti-twist plates 36, a positioning sleeve shaft 37, a first positioning sleeve 381, and a second positioning sleeve 382.

[0035] Refer to Figure 10 As shown, the rake teeth 31 have an annular body, and an anti-pollution tooth 312 and a pollution-scooping tooth 311 are provided on the outer side surface of the annular body. The included angle between the axes of the pollution-scooping tooth 311 and the anti-pollution tooth 312 can be 90 - 150°. In this embodiment, the included angle between the axes of the pollution-scooping tooth 311 and the anti-pollution tooth 312 is 120°. When the rake teeth 30 move from bottom to top, the included angle between the pollution-scooping tooth 311 and the anti-pollution tooth 312 is upward. Setting the included angle between the axes of the pollution-scooping tooth 311 and the anti-pollution tooth 312 to 120° can enable the rake teeth 31 to scoop up as much dirt as possible each time, and reduce the dropping of dirt during the process of lifting the dirt.

[0036] At the bottom of each of the dirt scraping teeth 311 and the dirt lifting teeth 312, there is an anti-twist groove 314 communicating with the inner cavity 315 of the body. Above the anti-twist groove 314, there are positioning shaft holes 313 respectively. The rake teeth 31 can be integrally laser cut, with fast and accurate processing and good stress resistance. The rake teeth 31 are sleeved on the rake tooth shaft 35 without affecting the stress of the rake tooth shaft 35.

[0037] The rake tooth shaft 35 is integrally cylindrical, and its diameter is adapted to the inner diameter of the circular ring body of the rake teeth 31. On the outer side of the rake tooth shaft 35, there are two anti-twist plates 36 with a length equivalent to that of the rake tooth shaft 35. The positions and shapes of the two anti-twist plates 36 are respectively adapted to the positions and shapes of the anti-twist grooves 314 of the dirt scraping teeth 311 and the dirt lifting teeth 312. The setting of the anti-twist plates 36 can enhance the rigidity of the rake teeth 31.

[0038] At both ends of the rake tooth shaft 35, there is a detachable end plate 32 respectively. The end plate 32 is connected to the end face of the rake tooth shaft 35 through a double-headed bolt 341. The connection between the end plate 32 and the rake tooth shaft is set to be detachable, which can facilitate the replacement of the damaged rake teeth 31.

[0039] The outer diameter of the positioning sleeve shaft 37 is adapted to the inner diameter of the positioning shaft hole 313 of the rake teeth 31, and is also adapted to the inner diameters of the first positioning sleeve 381 and the second positioning sleeve 382.

[0040] The circular ring body of the rake teeth 31 is sleeved on the rake tooth shaft 35, the anti-twist groove 314 is sleeved on the anti-twist plate 36, and the positioning sleeve shaft 37 passes through the positioning shaft hole 313 of the rake teeth 31. Between adjacent rake teeth 31, a positioning sleeve is sleeved on the positioning sleeve shaft 37. The two ends of the positioning sleeve shaft 37 are provided with external threads, and the rake teeth 31 and the positioning sleeve are clamped by screwing double nuts 342 from both ends. The diameter of the first positioning sleeve 381 arranged between the dirt scraping teeth 311 of the three rake teeth 31 at the outermost edge of the rake tooth shaft 35 is larger than that of the second positioning sleeve 382 in the middle of the rake tooth shaft 35. This setting can reduce the wear of the second positioning sleeve 382. Since it is more convenient to replace the first sleeve 381 due to wear than to replace the second sleeve 382.

[0041] On the side of the chain groove, there is a chute. Two rollers 33 respectively arranged at both ends of the tooth rake 30 roll along the chutes on both sides, which can prevent the tooth rake 30 from yawing and causing the machine operation to be blocked. On the end face of the roller shaft 331 of the roller 33, there is a shaft stopping face 332 perpendicular to the end face, and the shaft stopping face 332 abuts against the end plate 32.

[0042] The spacing between the rake teeth 31 is consistent with the spacing between the auxiliary grid bars and the main grid bars. The dirt scraping teeth 311 of the rake teeth 31 can be inserted between the auxiliary grid bars, and the dirt lifting teeth 312 of the rake teeth 31 can be inserted between the main grid bars.

[0043] Figure 7 and Figure 8Schematically shows the structure of a rotary anti-leakage and pollution cleaning machine according to an embodiment of the present utility model.

[0044] Referring Figure 7 and Figure 8 As shown, the rotary anti-leakage and pollution cleaning machine includes a frame 10, a tooth rake 30, a main grid 41, a bottom grid 42, a secondary grid 43, and a driving mechanism 20.

[0045] The frame 10 is generally in the shape of a long rectangle, and its top is arc-shaped and inclined backward. The width of the frame 10 can be set according to the actual needs of the water conservancy project.

[0046] The main grid 41 is arranged in the middle of the frame 10. The main grid bars of the main grid 41 are parallel to each other, evenly spaced, and vertically arranged. The lower end of the main grid 41 is usually set underwater. An arc-shaped back plate 11 is arranged above the main grid 41.

[0047] The bottom grid 42 is arranged at the front side of the lower part of the frame 10 and is usually set underwater. A first hinge plate 425 is arranged at the upper end of the bottom grid 42. The gap between the bottom grid 42 and the main grid 41 should be sufficient for the tooth rake 30 to pass through smoothly. The height of the secondary grid 43 is greater than the gap between the bottom grid 42 and the main grid 41. During the process that the tooth rake 30 touches the secondary grid 43 until it leaves the secondary grid 43, the upper end of the secondary grid 43 always inclines towards the main grid 41.

[0048] The secondary grid 43 is inclined, the lower end is hinged to the upper end of the bottom grid 41, and the upper end abuts against the main grid 41. Both the secondary grid 43 and the bottom grid 41 are used to intercept dirt in the water.

[0049] The main grid 41, the secondary grid 43, and the bottom grid 42 form a closed dirt interception body.

[0050] The driving mechanism 20 drives the tooth rake 30 to make a rotary motion around the main grid 41. On the side of the main grid 41 facing the secondary grid, the tooth rake 30 moves from bottom to top; on the other side of the main grid 41, the tooth rake 30 moves from top to bottom. During the process that the tooth rake 30 turns downward, the dirt it brings up from the bottom grid 42, the secondary grid 43, and the main grid 41 can be dumped on a separately provided sewage disposal device and transported away.

[0051] During the upward movement of the tooth rake 30, it will pass through the gap between the main grid 41 and the bottom grid 42. When the tooth rake 30 abuts against the upper end of the secondary grid 43, the tooth rake 30 will push the upper end of the secondary grid 43 away from the main grid 41. After the tooth rake 30 continues to move upward and leaves the secondary grid 43, due to the action of water flow and eccentricity, the upper end of the secondary grid 43 resumes abutting against the main grid 41.

[0052] In this embodiment, the drive mechanism 20 includes a motor 27, a first transmission chain 21, a second transmission chain 22, a first transmission wheel 23, a second transmission wheel 24, a third transmission wheel 25, and a transmission rod 26. In other embodiments, the drive mechanism can also adopt hydraulic or pneumatic transmission to drive the rake 30 to rotate up and down around the main grid 41.

[0053] The first transmission wheel 23 is fixedly connected to the rotor of the motor 27, and the motor 27 drives the first transmission wheel to rotate.

[0054] On the left and right sides of the frame 10, a chain groove is respectively arranged, and the chain groove surrounds the side of the main grid 41. Two first transmission chains 21 are respectively installed in the left and right chain grooves. The two ends of the rake 30 are respectively fixedly connected to the two first transmission chains 21, and the rake teeth of the rake 30 can extend into the gaps between the main grid bars. Multiple rakes 30 are arranged at intervals on the first transmission chain 21. With the drive of the drive mechanism 20, the rakes 30 continuously carry away the dirt remaining on the secondary grid 43 and the main grid 41.

[0055] The transmission rod 26 is arranged at the top of the frame 10 and spans the upper part of the main grid 41. Two third transmission wheels 25 are respectively fixedly connected to the two ends of the transmission rod 26, and the two first transmission chains 21 are respectively sleeved on the third transmission wheels 25. At the outer end of the third transmission wheel 25 on the right side of the transmission rod 26, a second transmission wheel 24 is fixedly arranged. The first transmission wheel 23 is connected to the second transmission wheel 24 through the second transmission chain 22 sleeved on them.

[0056] Steering wheels are respectively arranged at the lower parts of the two chain grooves, and the first transmission chain 21 is sleeved on the steering wheels.

[0057] When the motor 27 starts, it drives the first transmission wheel 23 to rotate. The first transmission wheel 23 drives the second transmission wheel 24 to rotate through the second transmission chain 22. The second transmission wheel 24 drives the two third transmission wheels 25 to rotate through the transmission rod 26. The two third transmission wheels 25 respectively drive the two first transmission chains 21 installed in the two chain grooves to rotate. The two first transmission chains 21 drive the rake 30 to rotate around the main grid 41.

[0058] Figure 9 Schematically shows the structure of the secondary grid of a rotary anti-leakage and dirt-removing machine according to an embodiment of the present invention.

[0059] Reference Figure 9As shown, the auxiliary grid 43 includes a plurality of auxiliary grid bars 431 which are parallel to each other, evenly spaced, and vertically arranged. The lower end of the auxiliary grid bar 431 is welded to a support plate 434, the cross section of which is L-shaped, and the lower end and the lower part of one side of the auxiliary grid bar 431 are welded to the support plate 434. A buffer grid bar 432 is provided at each end of the auxiliary grid 43, and a round steel 433 for triggering buffering is provided on the side of the buffer grid bar 432 close to the main grid, and the end face of the free end of the round steel 433 protrudes more than the rear end face of the auxiliary grid bar 431. The auxiliary grid bar 431 is passed through the support rod 436. Two second hinged plates 435 are provided at the lower end of the support plate 434, which are adapted to the position of the first hinged plate 425 on the bottom grid 42, and are used to be hinged with the bottom grid 42. The first hinge plate 425 and the second hinge plate 435 are provided with an anti-fouling cover, and a sliding bearing is provided inside, which can prevent dirt from entering the hinge part and affecting the rotation of the auxiliary grille 43. The rotation range between the first hinge plate 425 and the second hinge plate 435 can be set so that the rotation range of the auxiliary grille 43 is between the top end abutting the main grille 41 and the auxiliary grille 43 being in a vertical state, so that when the auxiliary grille 43 does not contact the tooth rake 30, its top end can always abut against the main grille 41 due to the impact of the water flow.

[0060] Figure 10 The partial structure of a rotary garbage cleaning machine according to one embodiment of the utility model is schematically shown.

[0061] refer to Figure 10 As shown, a semicircular chain steering cover 12 is provided at the lower end of the chain groove of the garbage cleaning machine, and a buffer rubber 50 is provided on the front end surface of the steering cover 12. Figure 13 One end of the buffer rubber 50 is fixedly connected to the steering cover 12 , and the other end is suspended downward to form a suspended section 51 .

[0062] When the garbage cleaning machine is not started, the upper end of the auxiliary grid 43 abuts against the main grid 41 , and the round steel 433 on the buffer grid bar 432 abuts against the suspended section 51 of the buffer rubber 50 .

[0063] Figure 11 Schematically shows Figure 10 The rotary garbage cleaning machine is shown in the state when the tooth rake contacts the auxiliary grid.

[0064] refer to Figure 11As shown, the tooth rake 30 moves from bottom to top along the chain groove driven by the first transmission chain 21. When the tooth rake 30 contacts the auxiliary grille 43, due to the driving force of the tooth rake 30, the auxiliary grille 43 rotates around the hinge axis, and the upper end of the auxiliary grille 43 leaves the main grille 41. The teeth of the tooth rake 30 can extend into the gap between the auxiliary grille bars 431, and the tooth rake 30 will take away the dirt retained on the auxiliary grille 43. After the tooth rake 30 moves to the top of the main grille 41, it will flip over, and the angle between the dirt shoveling teeth 311 and the dirt lifting teeth 312 is downward, and the attached dirt can be dumped onto the dirt conveying device arranged at the rear side of the frame and taken away.

[0065] Figure 12 Schematically shows Figure 10 The rotary garbage cleaning machine is shown in the state after the tooth rake leaves the auxiliary grid.

[0066] refer to Figure 12 As shown, after the tooth rake 30 leaves the top of the auxiliary grille 43, due to the effect of gravity and water flow, the auxiliary grille 43 rotates with the hinge axis as the center, and the top of the auxiliary grille 43 approaches the main grille 41. Since the free end of the round steel 433 provided at the front end of the buffer grille 432 protrudes from the rear end surface of the auxiliary grille 431, before the top of the auxiliary grille 431 contacts the main grille, the round steel 433 first contacts the suspended section 51 of the buffer rubber 50, pushing the suspended section 51 of the buffer rubber 50 toward the arc surface of the steering cover 12, further enhancing the buffering effect. This arrangement can prevent the top of the auxiliary grille 431 from hard contact with the main grille, can reduce the wear of the main grille and the auxiliary grille 431, and protect the main grille 41 and the auxiliary grille 43. In other embodiments, the arc surface can be provided on other components of the frame 10, as long as the position corresponds to the suspended section of the buffer rubber 50.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. The rake of a rotary cleaning machine, characterized in that, The rake includes a plurality of rake teeth, a rake tooth shaft, and an anti-twist plate; The rake teeth have an annular body, and a dirt-lifting tooth and a dirt-scraping tooth are arranged on the outer side surface of the annular body. The included angle between the axes of the dirt-scraping tooth and the dirt-lifting tooth is 90 - 150°; A twist-proof groove communicating with the inner cavity of the annular body is arranged at the bottom of each of the dirt-scraping tooth and the dirt-lifting tooth; The rake tooth shaft is in a cylindrical shape as a whole, and two anti-twist plates equivalent to the length of the rake tooth shaft are arranged on the outer side of the rake tooth shaft; The annular body of the rake tooth is sleeved on the rake tooth shaft, and the anti-twist groove is sleeved on the anti-twist plate.

2. The tooth rake according to claim 1, characterized in that, Positioning shaft holes are respectively arranged above the anti-twist grooves of the dirt-lifting tooth and the dirt-scraping tooth, and a positioning sleeve shaft is inserted through the positioning shaft holes; positioning sleeves are sleeved between adjacent rake teeth on the positioning sleeve shaft.

3. The tooth rake according to claim 2, characterized in that, The diameter of the positioning sleeve arranged between the dirt-scraping teeth of the rake tooth at the outermost edge of the rake tooth shaft is larger than that of the positioning sleeve between the dirt-scraping teeth in the middle of the rake tooth shaft.

4. The tooth rake according to claim 3, wherein External threads are arranged at both ends of the positioning sleeve shaft, and the rake teeth and the positioning sleeve are clamped by screwing two nuts from both ends.

5. The harrow according to any one of claims 1-4, characterized in that, Detachable end plates are respectively arranged at both ends of the rake tooth shaft.

6. The tooth rake according to claim 5, characterized in that, The end plate and the rake tooth shaft are connected by a double-headed bolt.

7. The tooth rake according to claim 5, characterized in that, Rollers are arranged on the outer side surface of the end plate.

8. The tooth rake according to claim 7, wherein, A shaft-stopping surface perpendicular to the end surface is arranged on the end surface of the roller shaft of the roller, and the shaft-stopping surface abuts against the end plate.

9. The tooth rake according to any one of claims 1-4, characterized in that, The included angle between the axes of the dirt-scraping tooth and the dirt-lifting tooth is 120°.

10. Rotating dirt cleaning machine, characterized in that, A rake of the rotary dirt cleaning machine according to any one of claims 1 - 9.

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