CN109779331B

CN109779331B - Automatic dirt suction device for pool

Info

Publication number: CN109779331B
Application number: CN201910177598.4A
Authority: CN
Inventors: 陈友苗; 陈可铭
Original assignee: Individual
Current assignee: Individual
Filing date: 2019-03-09
Publication date: 2024-04-26
Anticipated expiration: 2039-03-09

Abstract

The invention belongs to the technical field of cleaning equipment, in particular to an automatic sewage suction device for a water tank, which comprises a motor, wherein the motor drives a hollow rotating base to rotate, a sewage suction pipe for cleaning the bottom of the water tank is arranged on the rotating base, a sewage discharge shell is arranged on a shell of the motor, and the sewage suction pipe, the rotating base and an inner cavity of the sewage discharge shell are sequentially communicated to form a sewage discharge channel, and a liquid suction device is further arranged on the sewage discharge channel; the dirt absorbing pipe comprises a plurality of telescopic rods which are movably arranged together, an elastic piece is arranged between every two adjacent telescopic rods, and the elastic piece provides an outwards extending thrust for the telescopic rods at the outer ends. When the liquid suction device pumps liquid, impurities can be sucked into the sewage suction nozzle and discharged along with the sewage disposal channel, and meanwhile, the motor drives the sewage suction pipe to rotate at a low speed through the rotating base, and the sewage suction pipe rotates for a circle, so that the aim of cleaning a 360-degree water pool is fulfilled. In addition, the telescopic rod is always abutted against the side wall of the water tank under the action of the elastic piece, and the length of the sewage suction pipe can be automatically adjusted according to the shape of the water tank, so that the cleaning of different water tank shapes is realized.

Description

Automatic dirt suction device for pool

Technical Field

The invention belongs to the technical field of cleaning equipment, and particularly relates to an automatic sewage suction device for a water tank.

Background

Currently, in pool cleaning operations, manual cleaning is generally used, in which the water in the pool is first drained and then manually entered into the pool for cleaning. This has the following problems for large area ponds: firstly, because the area of the pool is large, a considerable amount of water resources are wasted before cleaning; secondly, the cost of manpower resources is relatively high, and the efficiency is low; in addition, when the water tank is cleaned, equipment matched with the water tank cannot work normally, and if the cleaning time is longer, the normal use of residents can be influenced.

Disclosure of Invention

The invention aims to provide the automatic sewage suction device for the water pool, which has the advantages of simple structure, high cleaning efficiency, good effect, low cost, convenient installation and resource saving.

The purpose of the invention is realized in the following way:

the automatic sewage suction device for the water tank comprises a motor, wherein the motor drives a hollow rotating base to rotate, a sewage suction pipe for cleaning the bottom of the water tank is arranged on the rotating base, and a sewage suction nozzle is arranged at the bottom of the hollow sewage suction pipe; the sewage suction device is characterized in that a sewage discharge shell is arranged on the shell of the motor, and the sewage suction pipe, the rotating base and the inner cavity of the sewage discharge shell are sequentially communicated to form a sewage discharge channel, and a liquid suction device is further arranged on the sewage discharge channel.

Preferably, the dirt sucking pipe comprises a plurality of telescopic rods which are movably arranged together, the inside of the telescopic rods are mutually communicated, and the dirt sucking mouth is arranged at the bottom of the telescopic rods; an elastic piece is arranged between two adjacent telescopic rods, and the elastic piece provides an outward extending thrust for the telescopic rods at the outer ends; the outer end of the final-stage telescopic rod is provided with a guide mechanism.

Preferably, the front end of the dirt sucking mouth is provided with a scraping strip, the scraping strip comprises a mounting part which is fixed on the telescopic rod, a through hole which is communicated with the dirt sucking mouth is formed in the upper end of the mounting part, two sides of the lower end of the mounting part respectively extend downwards to form a slag guiding part and a slag scraping part, and a suction port is formed between the slag guiding part and the slag scraping part.

Preferably, a sliding groove is formed in one end face of each telescopic rod, a sliding bar is formed in the other end face of each telescopic rod, and the sliding grooves and the sliding bars of two adjacent telescopic rods are matched with each other.

Preferably, the dirt absorbing pipe is internally provided with a counterweight bar, and the dirt absorbing pipe is a round pipe or a square pipe.

Preferably, the end part of the dirt suction pipe is vertically provided with a side wall dirt suction pipe for cleaning the side wall of the pool, the vertical dirt suction pipe is provided with a side wall dirt suction nozzle and a side wall scraping strip, and the side wall dirt suction pipe is also provided with a plurality of guide pulleys.

Preferably, the driving device is an external water pump or an impeller arranged on a motor shaft, the impeller is arranged at a liquid outlet of the rotating base, and the motor drives the impeller to rotate and pump liquid.

Preferably, the motor shaft of the motor drives the hollow rotating base to rotate through the reduction gearbox, the reduction gearbox comprises input teeth and a plurality of planetary gear reducers, the input teeth are fixedly arranged on the motor shaft, the planetary gear reducers comprise a plurality of planetary gears, a retainer and fluted discs, the plurality of planetary gears are rotatably arranged on the fluted discs through the retainer, the input teeth are meshed with the planetary gears, and the retainer is meshed with the planetary gears of the planetary gear reducer at the next stage or is connected with the rotating base.

Preferably, the automatic sewage suction device of the water tank is fixed through a bracket or a hoisting structure, and the concrete structure is as follows:

a bracket is arranged in the motor shaft in a penetrating way, the upper end of the bracket is fixed on the motor shell or the sewage disposal shell, and the lower end of the bracket is supported by a plurality of supporting feet;

The hoisting structure comprises a hard connecting pipe fixed on the pool top cover, the hard connecting pipe is fixedly connected with the sewage disposal shell, and the hard connecting pipe is communicated with the sewage disposal channel.

Preferably, the sewage disposal shell is sleeved outside the motor, a hollow scraping rod for cleaning the outer surface of the sewage disposal shell is arranged on the sewage disposal shell, and the hollow scraping rod is fixed on the rotating base and rotates along with the rotating base; the hollow scraping rod is provided with a dirt sucking notch which is opposite to the surface of the dirt discharging shell, and the dirt sucking notch is communicated with the dirt discharging channel through the inner cavity of the hollow scraping rod.

Compared with the prior art, the invention has the following outstanding and beneficial technical effects:

1. When the liquid suction device is used for sucking liquid, impurities accumulated at the bottom of the water tank can be sucked into the sewage suction nozzle and discharged along with the sewage discharging channel, so that the effect of cleaning the water tank is achieved. Meanwhile, after the motor is slowed down by the speed reducer, the dirt suction pipe and the rotating base are driven to rotate at a low speed, and the dirt suction pipe and the rotating base rotate for a circle, so that the purpose of cleaning a 360-degree pool is achieved.

2. According to the invention, the telescopic rod is in a structure, when the rotating base rotates, the telescopic rod is always abutted against the side wall of the water tank under the action of the elastic piece, the length of the sewage suction pipe can be automatically adjusted according to the shape of the water tank, cleaning of different water tank shapes is realized, and the applicability of products is increased. The guide mechanism is used for reducing resistance and facilitating movement of the telescopic rod.

3. The scraping strip is provided with the slag guiding part and the slag scraping part, wherein the slag guiding part is used for guiding impurities to enter the suction port, and the slag scraping part is used for collecting impurities adsorbed at the bottom by the scraping blade, so that a better cleaning effect is achieved.

4. One end face shaping of telescopic link has the spout, and its other end face shaping has the draw runner, and the spout and the draw runner of two adjacent telescopic links cooperate each other, and the consumer can dispose at will according to the size of pond, and adaptability is strong. On the other hand, the telescopic rod adopts a modular structure, thereby being convenient to produce and manufacture.

Drawings

Fig. 1 is a schematic structural view of a first embodiment of the present invention.

Fig. 2 is a cross-sectional view of a swivel base of a first embodiment of the invention.

Fig. 3 is a schematic structural view of a first type of dirt suction tube according to the present invention.

Fig. 4 is a top view of a first dirt pickup tube of the present invention.

Fig. 5 is a cross-sectional view of the first type of soil pick-up tube at A-A in fig. 3.

Fig. 6 is a schematic structural view of a second type of soil pick-up tube according to the present invention.

Fig. 7 is a cross-sectional view of a second type of soil pick-up tube at B-B in fig. 6.

Fig. 8 is a cross-sectional view of a second type of soil pick-up tube at C-C in fig. 6.

Fig. 9 is a schematic structural view of a third type of soil pick-up tube according to the present invention.

Fig. 10 is a cross-sectional view of a third type of soil pick-up tube at D-D in fig. 9.

Fig. 11 is a schematic structural view of the sidewall dirt pickup tube.

Fig. 12 is a schematic view of a mounting structure of a second embodiment of the present invention.

Fig. 13 is a schematic view of a hoisting structure according to a third embodiment of the invention.

Fig. 14 is a schematic view of a hoisting structure according to a fourth embodiment of the invention.

Fig. 15 is a schematic view of the installation structure of the external water pump of the present invention.

Fig. 16 is a schematic diagram of the present invention directed to cleaning an irregular pool of water.

The meaning indicated by the reference numerals in the figures:

1-a motor; 2-rotating the base; 3-a sewage disposal shell; 4-a sewage disposal channel; 5-a dirt suction pipe; 6, scraping strips; 7-a counterweight bar; 8-externally connecting a water pump; 9-an impeller; 10-a hollow scraping rod;

11-a motor shaft; 12-a bracket; 13-supporting legs; 14-a pinhole window; 15-a large pore window; 16-check valve; 17-a hard connecting pipe;

20-a reduction gearbox; 21-planet wheels; 22-a retainer; 23-fluted disc; 24-input teeth;

41-a pool; 42-pool top cover; 43-fixing seat;

51-a dirt suction nozzle; 52-a telescopic rod; 53-an elastic member; 54-a guide mechanism; 55-sliding grooves; 56-slide bar; 57-sidewall dirt pickup tube; 59-side wall wiper strip; 60-guiding pulleys;

61-an installation part; 62-a through hole; 63-a slag guiding part; 64-a slag scraping part; 65-suction opening.

Detailed Description

The invention is further described with reference to the following specific examples:

Embodiment one:

As shown in fig. 1-2: the automatic sewage suction device for the water tank comprises a motor 1, wherein the motor 1 drives a hollow rotating base 2 to rotate through a reduction gearbox 20, a sewage suction pipe 5 for cleaning the bottom of a water tank 41 is fixed on the rotating base 2, and a sewage suction nozzle 51 is arranged at the bottom of the hollow sewage suction pipe 5; the sewage suction pipe is characterized in that a sewage discharge shell 3 is arranged on the shell of the motor, the sewage suction pipe 5, the rotating base 2 and the inner cavity of the sewage discharge shell 3 are sequentially communicated to form a sewage discharge channel 4, a liquid suction device is further arranged on the sewage discharge channel 4, the driving device is an external water pump 8 (shown in fig. 15) or an impeller 9 arranged on a motor shaft 11, the impeller 9 is arranged at a liquid outlet of the rotating base 2, the motor drives the impeller to rotate and perform liquid suction, and at the moment, impurities accumulated at the bottom of a water tank can be sucked into the sewage suction nozzle 51 and discharged along with the sewage discharge channel 4, so that the effect of cleaning the water tank is achieved. Meanwhile, after the motor is slowed down by the speed reducer, the dirt suction pipe 5 and the rotating base 2 are driven to rotate slowly, and the aim of cleaning a 360-degree water pool is achieved.

The sewage disposal shell 3 can be sleeved outside the motor, and a sewage disposal channel 4 is formed between the sewage disposal shell and the motor shell. Alternatively, the drain housing 3 is fixed to one side of the motor housing, which may be understood as a drain pipe for collecting the liquid flowing out of the rotating base 2 or the impeller 9.

Preferably, the reduction gearbox 20 comprises an input tooth 24 fixedly arranged on the motor shaft 11 and a plurality of planetary gear reducers, the planetary gear reducers comprise a plurality of planetary gears 21, a retainer 22 and a fluted disc 23, 4 planetary gear reducers are provided in total, each planetary gear reducer comprises three planetary gears 21, the planetary gears 21 are rotatably arranged on the fluted disc 23 through the retainer 22, the plurality of fluted discs 23 are uniformly formed and fixed on a motor shell, the input tooth 24 is meshed with the planetary gears 21, the final retainer 22 is different from other structures, transmission teeth which are meshed with the planetary gears 21 of the next-stage planetary gear reducer are arranged on the previous retainers 22, and the final retainer is directly connected with the rotating base 2 without transmission teeth. The impeller can be arranged in the inner cavity of the final-stage retainer, and then the side wall of the final-stage retainer is provided with a liquid outlet hole communicated with the sewage disposal shell 3, so that sewage is conveniently discharged.

In this embodiment, a bracket fixing manner is adopted, a bracket 12 is penetrated inside the motor shaft 11, the upper end of the bracket 12 is fixed on the motor casing or the sewage casing 3, and the lower end of the bracket 12 is supported by a plurality of support legs 13. The joint of the bracket 12 and the motor shaft 11 is provided with a first bearing, so that the rotation is convenient. The invention is suitable for open water tanks, can be cleaned by being directly put into the water tank when in use, and has convenient use and low manufacturing cost.

Preferably, the device of the invention can be placed in a water tank for a long time, impurities can be accumulated on the outer surface of the device, in order to remove the impurities and ensure the cleanliness of the water tank, the sewage draining shell 3 of the embodiment is sleeved outside the motor 1, the sewage draining shell 3 is provided with a hollow scraping rod 10 for cleaning the outer surface of the sewage draining shell, the hollow scraping rod 10 is matched with the sewage draining shell 3, and the hollow scraping rod 10 is fixed on the rotating base 2 and rotates along with the rotating base 2; the hollow scraping rod 10 is provided with a dirt sucking notch which is opposite to the surface of the dirt discharging shell 3, and the dirt sucking notch is communicated with the dirt discharging channel 4 through the inner cavity of the hollow scraping rod 10.

In order to better clean the sink, several configurations of the dirt suction tube 5 are specifically described below:

1. For other pools of different shapes, in order to increase the applicability of the product, the dirt suction pipe 5 is designed into a telescopic rod structure, namely: as shown in fig. 3-4, the dirt suction pipe 5 includes a plurality of telescopic rods 52 movably arranged together, a first-stage telescopic rod 52a is fixed on the rotating base 2 by a screw, a guiding mechanism 54 is arranged at the outer end of a last-stage telescopic rod 52c, the guiding mechanism 54 is a pulley, a rolling ball or a round chamfer, sliding of the telescopic rod on the water tank wall is facilitated, and a plurality of middle telescopic rods 52b are further arranged in the middle. The inside of the telescopic rod 52 is mutually communicated, and the dirt sucking mouth 51 is arranged at the bottom. An elastic piece 53 is arranged between two adjacent telescopic rods 52, the elastic piece 53 is a spring, the elastic piece 53 provides an outward extending thrust for the telescopic rods 52 at the outer end, as shown in fig. 16, the length states of the telescopic rods at three different positions are shown, and according to different shapes of a pool, the telescopic rods stretch under the action of the spring and are always abutted against the side walls of the pool, so that dirt suction is realized.

The end of the final telescoping rod 52c is also provided with an end dirt pickup nozzle and an end wiper strip for better cleaning of corner debris.

In order to better clean the impurities on the side wall of the water tank, as shown in fig. 11, the end part of the dirt suction pipe 5 is vertically provided with a side wall dirt suction pipe 57 for cleaning the side wall of the water tank 41, the side wall dirt suction pipe 57 is provided with a side wall dirt suction nozzle and a side wall scraping strip 59, and the side wall dirt suction pipe 57 is also provided with a plurality of guide pulleys 60.

On the basis of the above, several dirt absorbing pipe structures are designed:

1. first kind: in order to facilitate production and manufacture, the telescopic rod is made into modularized unified specification, namely: the sliding grooves 55 are formed in one end face of each telescopic rod 52, the sliding strips 56 are formed in the other end face of each telescopic rod 52, the sliding grooves 55 and the sliding strips 56 of two adjacent telescopic rods 52 are matched with each other, consumers can configure the telescopic rods according to the size of a pool at will, and the adaptability is high.

In addition, in order to realize the inside intercommunication of telescopic link, set up aperture window 14 and macropore window 15 respectively on the contact surface of two adjacent telescopic links 52, when two telescopic links 52 stretch out and draw back under the effect of elastic component 53, the blowdown passageway 4 of intercommunication telescopic link 52 through aperture window 14 and macropore window 15. When the telescopic rod moves to the limit position, the small hole window 14 is always in the range of the large hole window 15 through the limit structure, and the fluidity of liquid is guaranteed. In addition, the telescopic pipe is usually made of stainless steel, aluminum alloy or plastic, and the weight of the telescopic pipe can be increased due to the fact that the plastic is light in weight.

In order to clean the impurities adsorbed on the bottom better, a rubber scraping strip 6 is arranged at the front end of the dirt sucking nozzle 51, the scraping strip 6 comprises a mounting part 61 which is fixed on the telescopic rod 52, a through hole 62 which is communicated with the dirt sucking nozzle 51 is formed in the upper end of the mounting part 61, two sides of the lower end of the mounting part 61 respectively extend downwards to form a slag guiding part 63 and a slag scraping part 64, and a suction port 65 is formed between the slag guiding part 63 and the slag scraping part 64.

2. Second kind: the telescopic link 52 adopts the mode of big pipe box tubule, and first-stage telescopic link is square for the large size, and secondary telescopic link is square for the small size and through the spring activity setting at the inner chamber of first-stage telescopic link, and the front end of secondary telescopic link is provided with the space that holds the rubber and scrapes the strip, dirt absorbing mouth 51 has been seted up to first-stage telescopic link and secondary telescopic link bottom.

3. Third kind: in order to prevent the dirt suction pipe 5 from being incapable of sucking the bottom surface due to insufficient weight, a counterweight bar 7 is arranged in the dirt suction pipe 5, and the dirt suction pipe 5 is a round thin-wall pvc plastic pipe in common cases. In addition, the end of the dirt suction pipe 5 is provided with a rolling ball.

2. For circular pond, the dirt absorbing pipe 5 can adopt a single tube with pond radius looks adaptation, and dirt absorbing nozzle 51 has been seted up to the bottom, and the rubber is scraped to the front end of dirt absorbing nozzle 51, and the automatic dirt absorbing ware of pond is placed in pond center, rotates dirt absorbing pipe 5 and can reach 360 clear effects of degree.

Embodiment two:

this embodiment is substantially the same as the first embodiment, except for the mounting manner: the automatic sewage suction device of the water tank is fixed through the mounting frame.

As shown in fig. 12: in this embodiment, motor 1, reducing gear box 20, impeller 9, blowdown shell 3 are all fixed on the pond top through the mounting bracket, and the holder of reducing gear box 20 passes through the stereoplasm connecting pipe and connects rotation base 2 for rotation base 2 stretches into the pond, rotation base 2 still is equipped with check valve 16, guarantees the normal work of impeller next time. In the embodiment, main components such as the motor are arranged outside the water tank, so that the motor is convenient to install and maintain, and is safer and more reliable.

Embodiment III:

This embodiment is substantially the same as the first embodiment, except for the mounting manner: the automatic sewage suction device of the water tank is fixed through a hoisting structure.

As shown in fig. 13: the lifting structure comprises a fixed seat, a fixed chuck, a chuck locking screw and a hard connecting pipe 17 fixed on the pool top cover 42, wherein the hard connecting pipe 17 is lifted on the fixed seat 43 through the fixed chuck, the lower end of the hard connecting pipe 17 is fixedly connected with the sewage disposal shell 3, and the hard connecting pipe 17 is communicated with the sewage disposal channel 4. The scheme is convenient to manufacture and low in cost, and can be realized only by reserving the mounting holes in the top cover of the pool.

Embodiment four:

As shown in fig. 14: the present embodiment is basically the same as the third embodiment, and is different in the mounting manner of the motor: the lifting structure comprises a hard connecting pipe 17 fixed on a pool top cover 42, a motor is arranged at the upper end of the hard connecting pipe 17, and the motor penetrates into the pool through an elongated motor shaft and drives a reduction gearbox, an impeller and a rotating base in a sewage disposal shell to rotate, so that cleaning is realized.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.

Claims

1. The utility model provides an automatic dirt suction device in pond, includes motor (1), its characterized in that: the motor (1) drives the hollow rotating base (2) to rotate, a sewage suction pipe (5) at the bottom of the clean water tank (41) is arranged on the rotating base (2), and a sewage suction nozzle (51) is arranged at the bottom of the hollow sewage suction pipe (5); a sewage draining shell (3) is arranged on the shell of the motor, the sewage sucking pipe (5), the rotating base (2) and the inner cavity of the sewage draining shell (3) are sequentially communicated and form a sewage draining channel (4), and a liquid pumping device is further arranged on the sewage draining channel (4);

The sewage suction pipe (5) comprises a plurality of telescopic rods (52) which are movably arranged together, the inside of the telescopic rods (52) are mutually communicated, and the sewage suction nozzle (51) is arranged at the bottom of the telescopic rods; an elastic piece (53) is arranged between two adjacent telescopic rods (52), and the elastic piece (53) provides an outward extending thrust for the telescopic rods (52) at the outer ends; the first-stage telescopic rod is fixed on the rotating base through a screw, and a guide mechanism (54) is arranged at the outer end of the last-stage telescopic rod.

2. An automatic pool cleaner as claimed in claim 1, wherein: the front end of the dirt sucking mouth (51) is provided with a scraping strip (6), the scraping strip (6) comprises a mounting part (61) which is fixed on the telescopic rod (52), a through hole (62) which is communicated with the dirt sucking mouth (51) is formed in the upper end of the mounting part (61), two sides of the lower end of the mounting part (61) respectively extend downwards to form a slag guiding part (63) and a slag scraping part (64), and a suction port (65) is formed between the slag guiding part (63) and the slag scraping part (64).

3. An automatic pool cleaner as claimed in claim 1, wherein: a sliding groove (55) is formed in one end face of each telescopic rod (52), a sliding bar (56) is formed in the other end face of each telescopic rod, and the sliding grooves (55) and the sliding bars (56) of two adjacent telescopic rods (52) are matched with each other.

4. An automatic pool cleaner as claimed in claim 1, wherein: a counterweight bar (7) is arranged in the sewage suction pipe (5).

5. An automatic sewage suction device for a pool according to any one of claims 1 to 4, wherein: the end part of the dirt suction pipe (5) is vertically provided with a side wall dirt suction pipe (57) for cleaning the side wall of the water tank (41), the side wall dirt suction pipe (57) is provided with a side wall dirt suction nozzle and a side wall scraping strip (59), and the side wall dirt suction pipe (57) is also provided with a plurality of guide pulleys (60).

6. An automatic pool cleaner as claimed in claim 1, wherein: the liquid pumping device is an external water pump (8) or an impeller (9) arranged on a motor shaft (11), the impeller (9) is arranged at a liquid outlet of the rotating base (2), and the motor drives the impeller to rotate and pump liquid.

7. An automatic pool cleaner according to any one of claims 1-4 and 6, wherein: the motor drives the hollow rotating base (2) to rotate through the reduction gearbox (20), the reduction gearbox (20) comprises an input tooth (24) and a plurality of planetary gear reducers, wherein the input tooth (24) and the plurality of planetary gear reducers are fixedly arranged on a motor shaft (11), each planetary gear reducer comprises a plurality of planetary gears (21), a retainer (22) and a fluted disc (23), the plurality of planetary gears (21) are rotatably arranged on the fluted disc (23) through the retainer (22), the input tooth (24) is meshed with the planetary gears (21), the retainer (22) is meshed with the planetary gears (21) of the next-stage planetary gear reducer, and the final-stage retainer of the retainer (22) is directly connected with the rotating base (2).

8. An automatic pool cleaner according to claim 7, wherein: the automatic sewage suction device of the water tank is fixed through a bracket (12) or through a hoisting structure, and the concrete structure is as follows:

A bracket (12) is arranged in the motor shaft (11) in a penetrating way, the upper end of the bracket (12) is fixed on the motor shell or the sewage disposal shell (3), and the lower end of the bracket (12) is supported by a plurality of supporting legs (13);

The lifting structure comprises a hard connecting pipe (17) fixed on a pool top cover (42), the hard connecting pipe (17) is fixedly connected with the sewage disposal shell (3), and the hard connecting pipe (17) is communicated with the sewage disposal channel (4).

9. An automatic pool cleaner as claimed in claim 1, wherein: the sewage disposal shell (3) is sleeved outside the motor (1), a hollow scraping rod (10) for cleaning the outer surface of the sewage disposal shell (3) is arranged on the sewage disposal shell, and the hollow scraping rod (10) is fixed on the rotating base (2) and rotates along with the rotating base; the hollow scraping rod (10) is provided with a dirt sucking notch which is opposite to the surface of the dirt discharging shell (3), and the dirt sucking notch is communicated with the dirt discharging channel (4) through the inner cavity of the hollow scraping rod (10).