1. The utility model provides a condenser whole region rubber ball cleaning system, its characterized in that, includes service robot, receives ball ware, collection ball ware, service pump, receives ball pump, first branch and converge ware, second branch and converge ware, total service pipeline, first service pipeline, second service pipeline, receives ball pipeline, service robot exhaust pipe, service robot drainage pipe, collection ball ware blowdown pipeline and electrical control cabinet, wherein:

one end of the condenser is respectively provided with a condenser water inlet chamber and a condenser water return chamber, and the other end of the condenser is provided with a condenser rotary water chamber;

the condenser water inlet chamber is connected with a circulating water inlet pipeline;

the condenser return chamber is connected with a circulating water return pipeline, the ball collector is arranged on the circulating water return pipeline, and the front and the back of the ball collector are also provided with a differential pressure measuring unit in parallel;

the ball serving device is respectively connected with one end of the first ball serving pipeline and one end of the second ball serving pipeline through a main ball serving pipeline, a first program control valve is arranged on the main ball serving pipeline, and the top of the ball serving device is externally connected with a ball serving device exhaust pipeline;

the other end of the first ball serving pipeline is connected with one end of a second program control valve, and the other end of the second program control valve is connected with the first junction divider;

the first manifold is connected with a circulating water inlet pipeline through two pipelines;

the other end of the second ball serving pipeline is connected with the ball inlet end of the ball collector;

ball collector upper portion external ball collector water drainage pipe way one end, ball collector export pipeline one end respectively, ball collector water drainage pipe way's the other end, ball collector export pipeline link to each other with a three-way both ends respectively, the three-way other end passes through the pipeline and links to each other with the second branch collection ware, and the second branch collection ware is continuous with condenser gyration hydroecium through two way pipelines, wherein:

a third program control valve is arranged on the drainage pipeline of the ball collector, and a fourth program control valve is arranged on the outlet pipeline of the ball collector;

the lower part of the ball collector is provided with a ball collector sewage discharge pipeline, and the ball collector sewage discharge pipeline is provided with a manual valve;

the ball serving device is connected with one end of a ball serving pump through a pipeline, and the other end of the ball serving pump is connected with a circulating water inlet pipeline;

the ball serving device is connected with one end of a ball collecting pump through a pipeline, and the other end of the ball collecting pump is connected with a circulating water return pipeline;

a ball dispenser drainage pipeline is externally connected to the bottom of the ball dispenser;

the ball serving device is connected with the ball receiving device through a ball receiving pipeline, and a fifth program control valve is arranged on the ball receiving pipeline;

the electric control cabinet is internally provided with a programmable logic control, the output end of the programmable logic control is respectively connected with the input end of the first program control valve, the input end of the second program control valve, the input end of the third program control valve, the input end of the fourth program control valve, the input end of the fifth program control valve, the input end of the ball delivery pump and the input end of the ball receiving pump, and the output end of the first program control valve, the output end of the second program control valve, the output end of the third program control valve, the output end of the fourth program control valve, the output end of the fifth program control valve and the output end of the differential pressure measuring unit are connected with the input end of the programmable logic control.

2. The condenser all-region rubber ball cleaning system according to claim 1, wherein a first filter screen is arranged in the ball dispenser, a ball adding port capable of being opened and closed is arranged on a first shell on the upper portion of the first filter screen, a first observation window is arranged on a cover plate of the ball adding port, and a ball dispenser serving pipeline interface, a ball dispenser ball receiving pipeline interface, a ball dispenser water pump pipeline interface, a ball dispenser exhaust pipeline interface and a ball dispenser drainage pipeline interface are arranged on the first shell.

3. The system of claim 1, wherein the internal volume of the ball dispenser is adapted to the amount of rubber balls in the condenser with 100% of the number of the single-channel single-pass cooling tubes.

4. The system for cleaning rubber balls in all areas of the condenser according to claim 1, wherein the ball collector is provided with an inner cavity, a second filter screen is arranged in the inner cavity, two ends of the second filter screen are connected with the inner walls of an inlet of the ball collector and an outlet of the ball collector, a drainage pipeline connector is arranged at the upper part of a second shell of the ball collector, and a sewage pipeline connector is arranged at the lower part of the second shell of the ball collector.

5. The system of claim 1, wherein a conical filter screen, a dirt cleaning mechanism, a transmission mechanism, a ball collecting box and a rubber ball outlet pipe are arranged in a third shell of the ball collector, a motor, a speed reducer and a second observation window are arranged outside the third shell of the ball collector, and wherein:

the large opening end of the conical filter screen is a water facing side and is circumferentially connected with the inner wall of the third shell;

the small opening end of the conical filter screen is connected with the ball collecting box;

the ball collecting box is connected with the rubber ball outlet pipe;

the rubber ball outlet pipe is connected with the ball dispenser through a ball collecting pipeline;

the dirt removing mechanism is connected with the speed reducer through the transmission mechanism;

the speed reducer is in transmission connection with the motor;

and the programmable logic controller is connected with the motor and is used for controlling the starting and stopping of the motor.

6. The system of claim 5, wherein the conical strainer of the ball collector has two openable fan-shaped mesh surfaces, the large opening end of each fan-shaped mesh surface is connected to the third housing through a rotating shaft assembly, the small opening ends of the two fan-shaped mesh surfaces are respectively connected to the first actuator and the second actuator, and the first actuator and the second actuator are mounted on the third housing and penetrate through the inner side and the outer side of the third housing.

7. The system according to claim 6, wherein the ball collector cleaning mechanism comprises a positioning device, an upper bearing seal assembly, a central rotating shaft, a lower bearing seal assembly, a wire brush and a wire brush fixing frame, wherein:

the outer end of the positioning device is circumferentially connected with the inner wall of the third shell of the ball collector;

the center of the positioning device is provided with the upper bearing seal assembly, and the outer contour diameter of the upper bearing seal assembly is larger than the maximum outer diameter of the central rotating shaft;

the center of the upper bearing sealing assembly is connected with the upper part of the central rotating shaft;

the lower part of the central rotating shaft is connected with the lower bearing sealing assembly;

the lower bearing sealing assembly is arranged at the center of the ball receiving box;

the steel wire brush is arranged on the outer side of the steel wire brush fixing frame;

the inner side of the steel wire brush fixing frame is arranged on the central rotating shaft;

the lower part of the central rotating shaft is provided with a lifting hook.

8. The system of claim 7, wherein a second observation window is arranged at the lower part of the third shell of the ball collector.

9. The condenser full-area rubber ball cleaning system according to claim 8, wherein the second observation window is provided with a cleaning assembly.

10. The system of claim 9, wherein the conical filter screen, the dirt removing mechanism, the transmission mechanism, the ball collecting box and the ball outlet pipe of the ball collector are all made of stainless steel.

Background

The rubber ball cleaning devices matched with 4 MW coal-fired steam turbine generator units of a certain company are all provided with two ball collecting nets, two rubber ball pumps, two ball loading chambers, other pipeline valves and other equipment. Because the unit construction year is different, therefore the ball receiving net of rubber ball belt cleaning device has two kinds of types: the ball collecting nets of the #1 and #2 units are SL-type movable grid funnel-type ball collecting nets of earlier stages, and the ball collecting nets of the #3 and #4 units are SF-type movable grid shunting-type ball collecting nets which are mainstream at present.

The rubber ball cleaning device has the functions that in the running process of the turbine unit, the sponge rubber balls (soft balls) are squeezed by auxiliary water flow through the tube bundle of the condenser and continuously circulate to scrub off dirt in the copper tube, so that the heat exchange efficiency is improved, the end difference of the condenser is reduced, and the economic running of the turbine unit is ensured.

Through the investigation to above-mentioned 4 units of units and other power plant units of the same trade, discover the supporting rubber ball belt cleaning device ubiquitous poor condition of result of use of unit. The main problems are summarized in the following two aspects:

1. the ball collecting nets of the two types often have the phenomenon that rubber balls and filler fragments are adhered to the surface of a net plate of the ball collecting net, so that the ball collecting rate is low, the water resistance of the ball collecting net is too large, and the normal operation of a unit is influenced. And the problem that the screen cannot be effectively solved after backwashing is adopted, and finally, a half-side condenser is required to be adopted for splitting and workers enter a ball collecting net for cleaning. If the net is not separated in a short period, the net collecting plate can deform under the action of water pressure, so that balls are seriously lost and can be used after being maintained. These adversely affect the unit operation and also increase the production costs.

2. The ball throwing amount specified by a rubber ball cleaning device manufacturer matched with the unit is 7-13% of the number of the single-channel single-flow cooling pipes of the condenser. Open the condenser and observe the discovery when overhauing many times, the cooling tube cleanness degree difference of different regions is great in the condenser. Especially, in the region far away from the water inlet pipe and the water return pipe of the condenser, the dirt of the cooling pipe is more serious.

Because the condenser is important equipment for establishing unit vacuum, the dirty cooling pipe causes the poor heat exchange efficiency of the exhaust steam and the cooling water of the steam turbine, the unit vacuum is reduced, and the economic operation of the unit is influenced, so that the rubber ball cleaning system which can realize that a ball receiving net is not easy to block and can be cleaned on line and can effectively clean the whole area of the condenser is urgently needed to be researched.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims at the problems, namely the invention discloses a condenser whole-area rubber ball cleaning system which thoroughly solves the problems of blockage of a ball collecting net, large difference of dirt degrees of different areas of a condenser cooling pipe and the like.

The technical scheme is as follows: the utility model provides a condenser whole region rubber ball cleaning system, includes ball dispenser, receives ball ware, collection ball ware, ball pump, receives ball pump, first branching ware, second branching ware, total service pipeline, first service pipeline, second service pipeline, receives ball pipeline, ball dispenser exhaust pipe, ball dispenser water drainage pipeline, collection ball ware blowdown pipeline and electrical control cabinet, wherein:

one end of the condenser is respectively provided with a condenser water inlet chamber and a condenser water return chamber, and the other end of the condenser is provided with a condenser rotary water chamber;

the condenser water inlet chamber is connected with a circulating water inlet pipeline;

the condenser return chamber is connected with a circulating water return pipeline, the ball collector is arranged on the circulating water return pipeline, and the front and the back of the ball collector are also provided with a differential pressure measuring unit in parallel;

the ball serving device is respectively connected with one end of the first ball serving pipeline and one end of the second ball serving pipeline through a main ball serving pipeline, a first program control valve is arranged on the main ball serving pipeline, and the top of the ball serving device is externally connected with a ball serving device exhaust pipeline;

the other end of the first ball serving pipeline is connected with one end of a second program control valve, and the other end of the second program control valve is connected with the first junction divider;

the first manifold is connected with a circulating water inlet pipeline through two pipelines;

the other end of the second ball serving pipeline is connected with the ball inlet end of the ball collector;

ball collector upper portion external ball collector water drainage pipe way one end, ball collector export pipeline one end respectively, ball collector water drainage pipe way's the other end, ball collector export pipeline link to each other with a three-way both ends respectively, the three-way other end passes through the pipeline and links to each other with the second branch collection ware, and the second branch collection ware is continuous with condenser gyration hydroecium through two way pipelines, wherein:

a third program control valve is arranged on the drainage pipeline of the ball collector, and a fourth program control valve is arranged on the outlet pipeline of the ball collector;

the lower part of the ball collector is provided with a ball collector sewage discharge pipeline, and the ball collector sewage discharge pipeline is provided with a manual valve;

the ball serving device is connected with one end of a ball serving pump through a pipeline, and the other end of the ball serving pump is connected with a circulating water inlet pipeline;

the ball serving device is connected with one end of a ball collecting pump through a pipeline, and the other end of the ball collecting pump is connected with a circulating water return pipeline;

a ball dispenser drainage pipeline is externally connected to the bottom of the ball dispenser;

the ball serving device is connected with the ball receiving device through a ball receiving pipeline, and a fifth program control valve is arranged on the ball receiving pipeline;

the electric control cabinet is internally provided with a programmable logic control, the output end of the programmable logic control is respectively connected with the input end of the first program control valve, the input end of the second program control valve, the input end of the third program control valve, the input end of the fourth program control valve, the input end of the fifth program control valve, the input end of the ball delivery pump and the input end of the ball receiving pump, and the output end of the first program control valve, the output end of the second program control valve, the output end of the third program control valve, the output end of the fourth program control valve, the output end of the fifth program control valve and the output end of the differential pressure measuring unit are connected with the input end of the programmable logic control.

Further, there is first filter screen in the service robot, is equipped with the ball mouth that adds that can open and shut on the first casing on first filter screen upper portion, be equipped with first observation window on the apron of ball mouth, be equipped with service robot service pipeline interface, service robot ball receiving pipeline interface, service robot water pump pipeline interface, service robot exhaust pipe interface and service robot drainage pipeline interface on the first casing.

Furthermore, the internal volume of the ball dispenser is adapted to the amount of rubber balls accounting for 100% of the number of the single-channel single-flow cooling pipes of the condenser.

Furthermore, the ball collector is provided with an inner cavity, a second filter screen is arranged in the inner cavity, two ends of the second filter screen are connected with the inner walls of the inlet of the ball collector and the outlet of the ball collector, a drainage pipeline connector is arranged on the upper portion of a second shell of the ball collector, and a sewage pipeline connector is arranged on the lower portion of the second shell of the ball collector.

Further, the third casing of ball ware is inside to have conical filter screen, trash cleaning mechanism, drive mechanism, receipts ball box, gluey ball fairlead, and the third casing outside of receiving the ball ware has motor, speed reducer, second observation window, wherein:

the large opening end of the conical filter screen is a water facing side and is circumferentially connected with the inner wall of the third shell;

the small opening end of the conical filter screen is connected with the ball collecting box;

the ball collecting box is connected with the rubber ball outlet pipe;

the rubber ball outlet pipe is connected with the ball dispenser through a ball collecting pipeline;

the dirt removing mechanism is connected with the speed reducer through the transmission mechanism;

the speed reducer is in transmission connection with the motor;

and the programmable logic controller is connected with the motor and is used for controlling the starting and stopping of the motor.

Furthermore, the conical filter screen of the ball collector is provided with two openable fan-shaped screen surfaces, the large opening ends of the fan-shaped screen surfaces are connected with the third shell through the rotating shaft assembly, the small opening ends of the two fan-shaped screen surfaces are respectively connected with the first actuating mechanism and the second actuating mechanism, and the first actuating mechanism and the second actuating mechanism are installed on the third shell and penetrate through the inner side and the outer side of the third shell.

Furthermore, the dirt cleaning mechanism of the ball collector is composed of a positioning device, an upper bearing sealing assembly, a central rotating shaft, a lower bearing sealing assembly, a steel wire brush and a steel wire brush fixing frame, wherein:

the outer end of the positioning device is circumferentially connected with the inner wall of the third shell of the ball collector;

the center of the positioning device is provided with the upper bearing seal assembly, and the outer contour diameter of the upper bearing seal assembly is larger than the maximum outer diameter of the central rotating shaft;

the center of the upper bearing sealing assembly is connected with the upper part of the central rotating shaft;

the lower part of the central rotating shaft is connected with the lower bearing sealing assembly;

the lower bearing sealing assembly is arranged at the center of the ball receiving box;

the steel wire brush is arranged on the outer side of the steel wire brush fixing frame;

the inner side of the steel wire brush fixing frame is arranged on the central rotating shaft;

a lifting hook is arranged at the lower part of the central rotating shaft;

furthermore, a second observation window is arranged at the lower part of the third shell of the ball collector.

Furthermore, the second observation window is provided with a cleaning assembly.

Furthermore, the conical filter screen, the dirt removing mechanism, the transmission mechanism, the ball collecting box and the rubber ball eduction tube of the ball collecting device are all made of stainless steel materials.

Has the advantages that: the invention discloses a condenser all-region rubber ball cleaning system which has the following beneficial effects:

1. the maximum ball throwing amount of the system can be allowed to reach 100% of the number of the single-side single-pass cooling pipes of the condenser, and all the cooling pipes can be effectively cleaned; the condenser is characterized in that independent service is alternately performed on a water inlet chamber and a rotary water chamber of the condenser, so that all cooling pipes on the lower part and the upper part of the condenser are effectively cleaned.

2. The ball collector has a conical filter screen, so that the effect of intercepting and collecting rubber balls is good; the dirt removing mechanism runs when balls are collected, rubber balls and filler fragments and the like adsorbed on the surface of the filter screen can be swept down through the steel wire brush, and the ball collecting rate is improved. The ball collecting rate of the system can reach 95-100%.

3. The cleaning mechanism forcibly cleans the surface of the filter screen, so that the filter screen is prevented from being blocked.

4. Two sections of net surfaces can be opened to the conical filter screen, and even if the filter screen is blocked, the water resistance can be reduced by opening the net surfaces, and the normal operation of the unit is ensured.

5. The diameter of the upper bearing sealing assembly of the ball collecting device is larger than that of the rotating shaft, the upper bearing sealing assembly is firstly detached during maintenance, and then the rotating shaft can be lifted from the cavity, so that the maintenance is facilitated.

6. The observation window on the ball collector shell can realize that on-line observation receives the inside filter screen closure of ball ware and dirty state, the running state of mechanism of decontaminating, receive the ball whether thorough etc. helps operating personnel to master and receives the inside running condition of ball ware to be convenient for discover problem, assay problem, formulate the maintenance scheme.

7. The cleaning device on the observation window can clean the inner wall of the glass at any time, and the phenomenon that the inner wall of the glass adsorbs sludge or scales to cause observation incapability is prevented.

8. Except the shell, the part of the ball collector in contact with water is made of stainless steel, so that the ball collector is good in rust resistance and corrosion resistance, the service life is prolonged, and the failure rate is reduced.

9. Compared with a rubber ball cleaning device matched with a unit, the system can keep the inner wall of the cooling pipe clean in long-term operation, improves the vacuum of the condenser and improves the operation economy of the unit.

Drawings

FIG. 1 is a schematic structural diagram of a full-area rubber ball cleaning system of a condenser disclosed by the invention;

fig. 2 is a schematic view of a ball dispenser.

Fig. 3 is a schematic view of a ball collector.

Fig. 4A is a schematic diagram of one embodiment of a ball catcher.

Fig. 4B is a schematic view of another angle of the ball catcher.

Fig. 5 is an exploded view of the ball collector cleaning mechanism.

Fig. 6A is a front view of the observation window.

Fig. 6B is a side view of the observation window.

Wherein:

the specific implementation mode is as follows:

the following describes in detail specific embodiments of the present invention.

As shown in fig. 1, a condenser whole-region rubber ball cleaning system comprises a ball dispenser 11, a ball collector 18, a ball collector 8, a ball dispenser 13, a ball collector 14, a first manifold 19, a second manifold 5, a total ball dispenser pipeline 23, a first ball dispenser pipeline 20, a second ball dispenser pipeline 21, a ball collector pipeline 22, a ball dispenser exhaust pipeline 10, a ball dispenser drain pipeline 12, a ball collector drain pipeline 6, a ball collector blowdown pipeline 9 and an electrical control cabinet, wherein:

one end of the condenser 3 is respectively provided with a condenser water inlet chamber 1 and a condenser water return chamber 2, and the other end of the condenser 3 is provided with a condenser rotary water chamber 4;

the condenser inlet chamber 1 is connected with a circulating water inlet pipeline 15;

the condenser return chamber 2 is connected with a circulating water return pipeline 16, a ball collector 18 is arranged on the circulating water return pipeline 16, and a differential pressure measuring unit 17 is arranged in parallel in front of and behind the ball collector 18;

the ball serving device 11 is respectively connected with one end of a first ball serving pipeline 20 and one end of a second ball serving pipeline 21 through a main ball serving pipeline 23, a first program control valve is arranged on the main ball serving pipeline 23, and the top of the ball serving device 11 is externally connected with a ball serving device exhaust pipeline 10;

the other end of the first ball-sending pipeline 20 is connected with one end of a second program control valve, and the other end of the second program control valve is connected with the first junction divider 19;

the first branching and merging device 19 is connected with the circulating water inlet pipeline 15 through two pipelines;

the other end of the second service pipeline 21 is connected with the ball inlet end of the ball collector 8;

ball collector 8 upper portion is external ball collector water discharge line 6 one end, ball collector outlet pipeline 7 one end respectively, and ball collector water discharge line 6's the other end, ball collector outlet pipeline 7 link to each other with a three-way both ends respectively, the three-way other end passes through the pipeline and links to each other with second branch collector 5, and second branch collector 5 is continuous with condenser gyration hydroecium 4 through two way pipelines, wherein:

a third program control valve is arranged on the ball collector drainage pipeline 6, and a fourth program control valve is arranged on the ball collector outlet pipeline 7;

the lower part of the ball collector 8 is provided with a ball collector sewage discharge pipeline 9, and the ball collector sewage discharge pipeline 9 is provided with a manual valve;

the ball serving device 11 is connected with one end of a ball serving pump 13 through a pipeline, and the other end of the ball serving pump 13 is connected with a circulating water inlet pipeline 15;

the ball dispenser 11 is connected with one end of a ball collecting pump 14 through a pipeline, and the other end of the ball collecting pump 14 is connected with a circulating water return pipeline 16;

the bottom of the ball dispenser 11 is externally connected with a ball dispenser drainage pipeline 12;

the ball dispenser 11 is connected with the ball receiver 18 through a ball receiving pipeline 22, and a fifth program control valve is arranged on the ball receiving pipeline 22;

the electrical control cabinet is internally provided with a programmable logic control, the output end of the programmable logic control is respectively connected with the input end of the first program control valve, the input end of the second program control valve, the input end of the third program control valve, the input end of the fourth program control valve, the input end of the fifth program control valve, the input end of the ball service pump 13 and the input end of the ball receiving pump 14, and the output end of the first program control valve, the output end of the second program control valve, the output end of the third program control valve, the output end of the fourth program control valve, the output end of the fifth program control valve and the output end of the differential pressure measuring unit 17 are connected with the input end of the programmable logic control.

As shown in fig. 2, a first filter 34 is disposed inside the ball dispenser 11, a ball inlet 31 capable of being opened and closed is disposed on a first housing 33 on the upper portion of the first filter 34, a first observation window 32 is disposed on a cover plate of the ball inlet 31, and a ball dispenser ball supply pipeline connector 38, a ball dispenser ball receiving pipeline connector 37, a ball dispenser water pump pipeline connector 36, a ball dispenser exhaust pipeline connector 39 and a ball dispenser drain pipeline connector 35 are disposed on the first housing 33.

Further, the internal volume of the ball dispenser 11 is adapted to the amount of rubber balls of 100% of the number of the single-channel single-pass cooling pipes of the condenser.

As shown in fig. 3, further, the ball collector 8 is provided with an inner cavity, a second filter screen 43 is arranged in the inner cavity, two ends of the second filter screen 43 are connected with inner walls of the ball collector inlet 41 and the ball collector outlet 45, a drain pipe connector 44 is arranged at the upper part of the second housing 42 of the ball collector 8, and a drain pipe connector 46 is arranged at the lower part of the second housing 42 of the ball collector 8.

As shown in fig. 4A and 4B, further, a conical filter screen 52, a dirt removing mechanism 58, a transmission mechanism 55, a ball collecting box 54, and a rubber ball outlet pipe 53 are arranged inside the third housing 51 of the ball collector 18, and a motor 57, a speed reducer 56, and a second observation window 62 are arranged outside the third housing 51 of the ball collector 18, wherein:

the big opening end of the conical filter screen 52 is a water facing side and is circumferentially connected with the inner wall of the third shell 51;

the small opening end of the conical filter screen 52 is connected with a ball collecting box 54;

the ball collecting box 54 is connected with the rubber ball eduction tube 53;

the rubber ball outlet pipe 53 is connected with the ball dispenser 11 through the ball collecting pipeline 22;

the cleaning mechanism 58 is connected with the speed reducer 56 through the transmission mechanism 55;

the reducer 56 is in transmission connection with a motor 57;

and the programmable logic controller is connected with the motor 57 and is used for controlling the start and stop of the motor 57.

Furthermore, the conical screen 52 of the ball collector 18 has two openable fan-shaped screen surfaces, the large opening ends of the fan-shaped screen surfaces are connected to the third housing 51 through the rotating shaft assembly 59, the small opening ends of the two fan-shaped screen surfaces are respectively connected to the first actuator 60 and the second actuator 61, and the first actuator 60 and the second actuator 61 are mounted on the third housing 51 and penetrate through the inner side and the outer side of the third housing 51.

As shown in fig. 5, further, the dirt cleaning mechanism 58 of the ball collector 18 is composed of a positioning device 71, an upper bearing seal assembly 72, a central rotating shaft 73, a lower bearing seal assembly 75, a wire brush 76 and a wire brush fixing frame 77, wherein:

the outer end of the positioning device 71 is circumferentially connected with the inner wall of the third shell 51 of the ball collector 18;

an upper bearing seal assembly 72 is arranged in the center of the positioning device 71, and the outer contour diameter of the upper bearing seal assembly 72 is larger than the maximum outer diameter of the central rotating shaft 73;

the center of the upper bearing seal assembly 72 is connected to the upper portion of the central rotating shaft 73;

the lower portion of the central rotating shaft 73 is connected to a lower bearing seal assembly 75;

the lower bearing seal assembly 75 is mounted in the center of the ball receiving box 54;

the wire brush 76 is arranged outside the wire brush fixing frame 77;

the inner side of the wire brush holder 77 is mounted on the central rotating shaft 73;

a hook 74 is installed at the lower part of the central rotating shaft 73

Furthermore, the lower part of the third casing 51 of the ball receiver 18 has a second observation window 62.

As shown in fig. 6A and 6B, further, the second observation window 62 has a cleaning assembly 81 thereon.

Furthermore, the conical filter screen 52, the dirt cleaning mechanism 58, the transmission mechanism 55, the ball collecting box 54 and the rubber ball eduction tube 53 of the ball collector 18 are all made of stainless steel materials.

The embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.