Boiler dirt cleaning device

Abstract

The invention discloses a boiler dirt cleaning device, and relates to the technical field of boiler maintenance, the boiler dirt cleaning device comprises a moving mechanism, a cleaning mechanism and a liquid spraying mechanism, the moving mechanism comprises a mounting cylinder, a first motor, a second motor and moving wheels, mounting grooves are uniformly distributed in the periphery of the mounting cylinder, and the moving wheels are driven by the first motor to contract or extend to the mounting grooves; the second motor drives the moving wheels to move in the boiler pipeline. The cleaning mechanism comprises a rotating disc, a plurality of cleaning shovels and a motor III, the cleaning shovels are uniformly distributed on the edge of the rotating disc, and the motor III drives the cleaning shovels to spirally move in the boiler pipeline and remove stubborn dirt in the boiler pipeline; the liquid spraying mechanism comprises a liquid spraying head, the liquid spraying head is arranged in the middle of the front portion of the mounting cylinder, and during cleaning, cleaning liquid is sprayed to the inner wall of the boiler pipeline through the liquid spraying head, and stubborn dirt in the boiler pipeline is washed and dissolved. The device has the advantages of being reasonable in scheme design, ingenious in structural design and convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of boiler maintenance, and in particular to a boiler dirt cleaning device. Background Art

[0002] At present, boiler pipeline facilities will age or corrode due to long-term transportation of water, oil or similar types of fluids, resulting in pipeline damage or dirt sticking to the inner wall of the connected pipe. Especially in steel plants, such poor pipeline facilities will have serious consequences. The water environment in the boiler will cause calcium and magnesium flocculent precipitation in the water that has not been completely desalted. The various forms of sediments deposited inside the boiler water supply pipe will cause problems such as low supply and liquid supply efficiency and accelerated corrosion inside the pipe. If the dirt on the inner wall of the pipe is not cleaned regularly, the dirt adhesion will reduce the thermal efficiency of the boiler, the channel of the pipe will become narrower, and finally lead to pipe blockage, affecting the use of the boiler, causing holes in the pipe wall to cause leakage and other safety accidents. Therefore, pipeline facilities need to be inspected and cleaned at any time or periodically at industrial sites.

[0003] Cleaning the dirt thoroughly has always been an urgent desire of boiler users, and it has always been a problem that bothers them. Although there are many cleaning devices on the market in recent years, they all use water or chemical liquids as cleaning media. Although they can clean some dirt, they cannot completely clean the stubborn dirt on the heating surface. Summary of the invention

[0004] The object of the present invention is to provide a boiler fouling cleaning device to solve the above-mentioned defects caused by the prior art.

[0005] A boiler dirt cleaning device comprises a moving mechanism, a cleaning mechanism and a liquid spraying mechanism, wherein:

[0006] The moving mechanism includes a mounting tube, a first motor, a second motor and a moving wheel. The mounting tube is evenly distributed with mounting grooves around it. The first motor drives the moving wheel to contract or extend at the mounting groove, and the second motor drives the moving wheel to move axially in the boiler pipe.

[0007] The cleaning mechanism includes a rotating disk, a cleaning shovel and a motor 3. The cleaning shovels are provided in a plurality and evenly distributed on the edge of the rotating disk. The motor 3 drives the cleaning shovel to spirally move in the boiler pipe and remove the stubborn dirt in the boiler pipe.

[0008] The liquid spraying mechanism comprises a liquid spraying head, which is centrally arranged in front of the mounting tube. During cleaning, the cleaning liquid is sprayed onto the inner wall of the boiler pipe through the liquid spraying head, and the stubborn dirt in the boiler pipe is flushed and dissolved.

[0009] Preferably, the rear end of the mounting cylinder is coaxially connected to a mounting plate, and several motors are provided and evenly mounted on the mounting plate, the output end of each motor is connected to a threaded rod via a coupling, and a moving block is threadedly connected to the threaded rod, a moving bar is fixed in parallel to the outside of the moving block, a pair of hinged bars are connected in parallel at both ends of the moving bar, each pair of hinged bars passes through corresponding mounting grooves and is hinged to a rectangular mounting frame, a pair of return springs are connected between the mounting frame and the moving bar, a pair of motors are symmetrically mounted on the front and rear ends of the mounting frame, the motor is a double-headed motor and a pair of moving wheels are keyed to its two output ends.

[0010] Preferably, the cleaning mechanism also includes a rotating tube and a rotating sleeve, the rotating disk is coaxially fixed to the front end of the rotating tube, the rotating sleeve is rotatably connected to the front end of the mounting tube through a one-way bearing, and the rotating sleeve is coaxially sleeved on the rotating tube, the interior of the rotating sleeve is evenly distributed with spiral sliding grooves, the outside of the rotating tube is evenly distributed with sliding blocks 1, the sliding blocks 1 are correspondingly slidably connected in the sliding grooves, the rear end of the rotating tube is rotatably connected with a fixing ring, and a reset spring 2 is sleeved on the rotating tube.

[0011] Preferably, the motor three is centrally mounted on the mounting plate, and a movable ring is keyed at its output end, sliding blocks two are evenly distributed on the outside of the movable ring, a movable tube is coaxially sleeved on the outside of the movable ring, and Z-shaped movable grooves connected to each other are evenly distributed inside the movable tube, and the sliding block two is correspondingly slidably connected in the movable groove, a movable plate is coaxially fixed on the outside of the movable tube, and a number of guide pins are evenly connected on the movable plate, the guide pins are slidably inserted on the mounting plate, and a return spring three is sleeved on the guide pins, a piston cylinder one is coaxially fixed at the front end of the movable tube, and a piston block one is slidably connected in the piston cylinder one, a piston rod one is vertically fixed to the center of the piston block one, and the piston rod is coaxially arranged behind the rotating tube.

[0012] Preferably, the liquid spraying mechanism also includes a plurality of piston cylinders 2, wherein the piston cylinders 2 are mounted on the side of the piston cylinder 1 through a fixing plate, the interior of the piston cylinder 2 is slidably connected with a piston block 2, and a plurality of liquid holes are evenly distributed on the piston block 2, and a sealing plate is hinged at each liquid hole, a piston rod 2 is vertically fixed to the center of the piston block 2, and the end of the piston rod 2 is connected to the front end of the mounting cylinder, the front and rear ends of the piston cylinder 2 are respectively connected with a liquid outlet pipe and a liquid inlet pipe, and the other end of the liquid outlet pipe is connected to the side of the fixing ring, the rotating tube has liquid inlet grooves evenly distributed inside the fixing ring, and the liquid spraying head is installed at the front end of the rotating tube.

[0013] Preferably, the outer side of the cleaning shovel is densely covered with cleaning hairs.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. When the sliding block 2 on the movable ring is driven by the motor 3 to rotate in the Z-shaped moving groove, the moving tube will perform axial reciprocating movement, thereby synchronously driving the piston cylinder 1 to perform axial reciprocating movement, and the piston block 1 in the piston cylinder 1 is continuously accelerated due to its own inertia, and the kinetic energy obtained by the piston block 1 is transmitted to the rotating tube through the collision between the piston rod 1 and the rotating tube, thereby pushing the rotating tube to move forward, and finally transmitting the kinetic energy to the cleaning shovel, thereby improving the shoveling effect.

[0016] 2. According to the present invention, when the piston cylinder 1 moves forward, the piston cylinder 2 will be driven forward synchronously. Since the sealing plate is in an open state, the cleaning liquid in the piston cylinder 2 will be transferred to the front of the piston block 2 through the liquid hole. When the piston cylinder 1 moves backward, since the sealing plate is in a blocked state, the piston cylinder 2 will be driven backward synchronously. The cleaning liquid in front of the piston block 2 will be transported to the fixed ring through the liquid outlet pipe, and then transported to the rotating tube through the liquid inlet tank, and finally the cleaning liquid will be sprayed onto the inner wall of the boiler pipe through the liquid spray head, and the stubborn dirt in the boiler pipe will be flushed and dissolved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the overall mobile mechanism from the first perspective.

[0019] Figure 3 It is a structural schematic diagram of the overall mobile mechanism from the second perspective.

[0020] Figure 4 It is a schematic diagram of the local three-dimensional structure of the mobile mechanism.

[0021] Figure 5 This is a schematic diagram of the structure of the cleaning mechanism from the first perspective.

[0022] Figure 6 This is a schematic diagram of the structure of the cleaning mechanism from the second perspective.

[0023] Figure 7 This is a structural diagram of a partial first-person perspective of the cleaning mechanism.

[0024] Figure 8 It is a structural schematic diagram of the cleaning mechanism from a partial second perspective.

[0025] Fig. 9 It is a schematic diagram of the overall three-dimensional structure of the spray mechanism.

[0026] Fig.10 It is a schematic diagram of the local three-dimensional structure of the spray mechanism.

[0027] in:

[0028] 10-moving mechanism; 101-installing cylinder; 101a-installing groove; 102-installing plate; 103-motor 1; 104-coupling; 105-threaded rod; 106-moving block; 107-moving bar; 108-hinged bar; 109-installing frame; 110-reset spring 1; 111-motor 2; 112-moving wheel;

[0029] 20-cleaning mechanism; 201-rotating tube; 201a-liquid inlet tank; 202-rotating disk; 203-cleaning shovel; 204-cleaning hair; 205-one-way bearing; 206-rotating sleeve; 206a-sliding groove; 207-sliding block 1; 208-fixing ring; 209-reset spring 2; 210-motor 3; 211-movable ring; 212-sliding block 2; 213-moving tube; 213a-moving groove; 214-moving plate; 215-guide pin; 216-reset spring 3; 217-piston cylinder 1; 218-piston block 1; 219-piston rod 1;

[0030] 30-liquid spraying mechanism; 301-piston cylinder 2; 302-fixed plate; 303-piston block 2; 303a-liquid through hole; 304-sealing plate; 305-piston rod 2; 306-liquid inlet pipe; 307-liquid outlet pipe; 308-liquid spraying head. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] like Figures 1 to 10 As shown, a boiler dirt cleaning device includes a moving mechanism 10, a cleaning mechanism 20 and a liquid spraying mechanism 30, wherein:

[0033] The moving mechanism 10 includes a mounting tube 101, a motor 103, a motor 111 and a moving wheel 112. The mounting tube 101 is evenly distributed with mounting grooves 101a around it. The motor 103 drives the moving wheel 112 to contract or extend at the mounting groove 101, and the motor 111 drives the moving wheel 112 to move axially in the boiler pipe.

[0034] The cleaning mechanism 20 includes a rotating disk 202, a cleaning shovel 203 and a motor 3 210. The cleaning shovel 203 is provided with a plurality of cleaning shovels evenly distributed on the edge of the rotating disk 202. The motor 3 210 drives the cleaning shovel 203 to spirally move in the boiler pipe and remove the stubborn dirt in the boiler pipe.

[0035] The liquid spraying mechanism 30 includes a liquid spraying head 308, which is centrally arranged in front of the mounting tube 101. During cleaning, the cleaning liquid is sprayed onto the inner wall of the boiler pipe through the liquid spraying head 308, and the stubborn dirt in the boiler pipe is flushed and dissolved.

[0036] In this embodiment, the rear end of the mounting cylinder 101 is coaxially connected to the mounting plate 102, and the motors 103 are provided with a plurality of motors 103 and are evenly mounted on the mounting plate 102. The output end of each motor 103 is connected to a threaded rod 105 through a coupling 104, and a moving block 106 is threadedly connected to the threaded rod 105. A moving bar 107 is fixed in parallel to the outer side of the moving block 106, and a pair of hinged bars 108 are connected in parallel to both ends of the moving bar 107. Each pair of hinged bars 108 passes through the corresponding mounting groove 101a and is hinged to a rectangular mounting frame 109. A pair of return springs 110 are connected between the mounting frame 109 and the moving bar 107. A pair of motors 111 are symmetrically mounted on the front and rear ends of the mounting frame 109. The motor 111 is a double-headed motor and a pair of moving wheels 112 are keyed to its two output ends. The moving bar 107 can be driven to move forward by the motor 103, but the hinged bar 108 in front is deflected due to the obstruction of the front edge of the installation groove 101a, thereby driving the installation frame 109 to extend outward and making the moving wheel 112 contact the inner wall of the boiler pipe, and then the whole cleaning device can be driven to move axially along the boiler pipe by the motor 2 111.

[0037] In this embodiment, the cleaning mechanism 20 also includes a rotating tube 201 and a rotating sleeve 206. The rotating disk 202 is coaxially fixed to the front end of the rotating tube 201. The rotating sleeve 206 is rotatably connected to the front end of the mounting tube 101 through a one-way bearing 205, and the rotating sleeve 206 is coaxially sleeved on the rotating tube 201. The interior of the rotating sleeve 206 is evenly distributed with spiral sliding grooves 206a, and the outer side of the rotating tube 201 is evenly distributed with sliding blocks 207. The sliding blocks 207 are correspondingly slidably connected in the sliding grooves 206a. The rear end of the rotating tube 201 is rotatably connected with a fixing ring 208, and a reset spring 209 is sleeved on the rotating tube 201. When the rotating tube 201 is subjected to the forward impact force, the rotating tube 201 will move forward synchronously, and the one-way bearing 205 is in a stuck state, so that when the sliding block 1 207 on the rotating tube 201 axially passes through the spiral sliding groove 206a, the rotating tube 201 and the cleaning shovel 203 on the rotating disk 202 are deflected, and then the stubborn dirt in the boiler pipe is removed by the spirally moving cleaning shovel 203. When the rotating tube 201 moves backward rapidly under the action of the return spring 209, the one-way bearing 205 is in an active state, so that when the sliding block 1 207 on the rotating tube 201 axially passes through the spiral sliding groove 206a, the rotating tube 201 and the cleaning shovel 203 on the rotating disk 202 do not deflect and stay at the latest cleaning position.

[0038] In this embodiment, the motor 3 210 is centrally mounted on the mounting plate 102, and a movable ring 211 is keyed at its output end, and sliding blocks 212 are evenly distributed on the outer side of the movable ring 211. A moving tube 213 is coaxially sleeved on the outer side of the movable ring 211, and Z-shaped moving grooves 213a connected to each other are evenly distributed inside the moving tube 213. The sliding blocks 212 are correspondingly slidably connected in the moving grooves 213a, and the outer side of the moving tube 213 is coaxially fixed with A movable plate 214 is provided, and a plurality of guide pins 215 are evenly connected to the movable plate 214. The guide pins 215 are slidably inserted into the mounting plate 102, and a return spring 216 is mounted on the guide pins 215. A piston cylinder 217 is coaxially fixed to the front end of the movable tube 213, and a piston block 218 is slidably connected in the piston cylinder 217. A piston rod 219 is vertically fixed to the center of the piston block 218, and the piston rod 219 is coaxially arranged at the rear of the rotating tube 201. When the sliding block 212 on the movable ring 211 is driven by the motor 3 210 to rotate in the Z-shaped moving groove 213a, the moving tube 213 will perform axial reciprocating movement, thereby synchronously driving the piston cylinder 1 217 to perform axial reciprocating movement, and the piston block 1 218 in the piston cylinder 1 217 is continuously accelerated due to its own inertia, and through the collision between the piston rod 1 219 and the rotating tube 201, the kinetic energy obtained by the piston block 1 218 is transferred to the rotating tube 201, thereby pushing the rotating tube 201 to move forward, and finally transferring the kinetic energy to the cleaning shovel 203, thereby improving the shoveling effect.

[0039] In this embodiment, the liquid spraying mechanism 30 also includes a plurality of piston cylinders 301, which are installed on the side of the piston cylinder 216 through a fixing plate 302. The piston cylinder 301 is slidably connected to a piston block 303 inside, and a plurality of liquid holes 303a are evenly distributed on the piston block 303. A sealing plate 304 is hinged at each liquid hole 303a. A piston rod 305 is vertically fixed to the center of the piston block 303, and the end of the piston rod 305 is connected to the front end of the mounting cylinder 101. The front and rear ends of the piston cylinder 301 are respectively connected to a liquid outlet pipe 307 and a liquid inlet pipe 306, and the other end of the liquid outlet pipe 307 is connected to the side of the fixing ring 208. The rotating tube 201 has liquid inlet grooves 201a evenly distributed inside the fixing ring 208, and the liquid spraying head 308 is installed at the front end of the rotating tube 201. When the piston cylinder 1 216 moves forward, it will synchronously drive the piston cylinder 2 301 to move forward. Since the sealing plate 304 is in an open state, the cleaning liquid in the piston cylinder 2 301 is transferred to the front of the piston block 2 303 through the liquid hole 303a; when the piston cylinder 1 216 moves backward, since the sealing plate 304 is in a blocked state, it will synchronously drive the piston cylinder 2 301 to move backward, and then the cleaning liquid in front of the piston block 2 303 is transported to the fixed ring 208 through the liquid outlet pipe 307, and then transported to the rotating tube 201 through the liquid inlet groove 201a, and finally spray the cleaning liquid on the inner wall of the boiler pipeline through the liquid spray head 308, and flush and dissolve the stubborn dirt in the boiler pipeline. At the same time, since a vacuum negative pressure environment is formed behind the piston block 2 303, the external cleaning liquid is sucked into the piston cylinder 2 301 through the liquid inlet pipe 306.

[0040] In this embodiment, the outer side of the cleaning shovel 203 is densely covered with cleaning hairs 204. The cleaning hairs 204 can scrub the inner wall of the boiler pipe to improve the cleaning effect.

[0041] Working principle of this boiler fouling cleaning device:

[0042] The cleaning device is placed into the boiler pipe, and the moving bar 107 can be driven forward by the motor 103, but the front hinged bar 108 is deflected due to the obstruction of the front edge of the installation groove 101a, thereby driving the installation frame 109 to extend outward and making the moving wheel 112 contact the inner wall of the boiler pipe, and then the whole cleaning device can be driven to move axially along the boiler pipe by the motor 2 111.

[0043] When the sliding block 212 on the movable ring 211 is driven by the motor 3 210 to rotate in the Z-shaped moving groove 213a, the moving tube 213 will perform axial reciprocating movement, thereby synchronously driving the piston cylinder 1 217 to perform axial reciprocating movement, and the piston block 1 218 in the piston cylinder 1 217 is continuously accelerated due to its own inertia, and through the collision between the piston rod 1 219 and the rotating tube 201, the kinetic energy obtained by the piston block 1 218 is transferred to the rotating tube 201, thereby pushing the rotating tube 201 to move forward, and finally transferring the kinetic energy to the cleaning shovel 203, thereby improving the shoveling effect.

[0044] When the piston cylinder 1 216 moves forward, it will synchronously drive the piston cylinder 2 301 to move forward. Since the sealing plate 304 is in an open state, the cleaning liquid in the piston cylinder 2 301 is transferred to the front of the piston block 2 303 through the liquid hole 303a; when the piston cylinder 1 216 moves backward, since the sealing plate 304 is in a blocked state, it will synchronously drive the piston cylinder 2 301 to move backward, and the cleaning liquid in front of the piston block 203 is transported to the fixed ring 208 through the liquid outlet pipe 307, and then transported to the rotating tube 201 through the liquid inlet groove 201a, and finally spray the cleaning liquid onto the inner wall of the boiler pipe through the liquid spray head 308, and flush and dissolve the stubborn dirt in the boiler pipe.

[0045] Therefore, the embodiments disclosed above are only illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A boiler dirt cleaning device, characterized in that: It comprises a moving mechanism (10), a cleaning mechanism (20) and a liquid spraying mechanism (30), wherein: The moving mechanism (10) comprises a mounting tube (101), a first motor (103), a second motor (111) and a moving wheel (112); the mounting tube (101) is evenly distributed with mounting grooves (101a) around it; the first motor (103) drives the moving wheel (112) to contract or extend at the mounting groove (101); and the second motor (111) drives the moving wheel (112) to move axially in the boiler pipe; The cleaning mechanism (20) comprises a rotating disk (202), a cleaning shovel (203) and a third motor (210); the cleaning shovel (203) is provided with a plurality of cleaning shovels evenly distributed on the edge of the rotating disk (202); the third motor (210) drives the cleaning shovel (203) to spirally move in the boiler pipe, and removes stubborn dirt in the boiler pipe; The liquid spraying mechanism (30) comprises a liquid spraying head (308), which is centrally arranged in front of the mounting tube (101). During cleaning, the liquid spraying head (308) sprays cleaning liquid onto the inner wall of the boiler pipe, and flushes and dissolves stubborn dirt in the boiler pipe.

2. A boiler fouling cleaning device according to claim 1, characterized in that: The rear end of the mounting cylinder (101) is coaxially connected to a mounting plate (102), a plurality of motors (103) are provided and evenly mounted on the mounting plate (102), the output end of each motor (103) is connected to a threaded rod (105) via a coupling (104), and a moving block (106) is threadedly connected to the threaded rod (105), a moving bar (107) is fixed in parallel to the outer side of the moving block (106), and the two ends of the moving bar (107) are parallel to each other. A pair of hinged bars (108) are connected, each pair of hinged bars (108) passes through a corresponding installation slot (101a) and is hinged to a rectangular installation frame (109), a pair of return springs (110) are connected between the installation frame (109) and the moving bar (107), a pair of motors (111) are symmetrically installed at the front and rear ends of the installation frame (109), and the motors (111) are double-headed motors and are keyed to a pair of moving wheels (112) at both output ends.

3. A boiler fouling cleaning device according to claim 1, characterized in that: The cleaning mechanism (20) further comprises a rotating tube (201) and a rotating sleeve (206), wherein the rotating disk (202) is coaxially fixed to the front end of the rotating tube (201), the rotating sleeve (206) is rotatably connected to the front end of the mounting tube (101) via a one-way bearing (205), and the rotating sleeve (206) is coaxially sleeved on the rotating tube (201), the interior of the rotating sleeve (206) is uniformly distributed with spiral sliding grooves (206a), the outer side of the rotating tube (201) is uniformly distributed with sliding blocks 1 (207), and the sliding blocks 1 (207) are correspondingly slidably connected to the sliding grooves (206a), the rear end of the rotating tube (201) is rotatably connected with a fixing ring (208), and a return spring 2 (209) is sleeved on the rotating tube (201).

4. A boiler fouling cleaning device according to claim 3, characterized in that: The motor 3 (210) is centrally mounted on the mounting plate (102), and a movable ring (211) is keyed at its output end, and sliding blocks 2 (212) are evenly distributed on the outer side of the movable ring (211), and a moving tube (213) is coaxially sleeved on the outer side of the movable ring (211), and Z-shaped moving grooves (213a) connected to each other are evenly distributed inside the moving tube (213), and the sliding blocks 2 (212) are correspondingly slidably connected in the moving grooves (213a), and a moving plate (214) is coaxially fixed on the outer side of the moving tube (213). ), and a plurality of guide pins (215) are evenly connected to the movable plate (214), the guide pins (215) are slidably inserted on the mounting plate (102), and a return spring three (216) is mounted on the guide pins (215), a piston cylinder one (217) is coaxially fixed to the front end of the movable tube (213), and a piston block one (218) is slidably connected in the piston cylinder one (217), a piston rod one (219) is vertically fixed to the center of the piston block one (218), and the piston rod one (219) is coaxially arranged at the rear of the rotating tube (201).

5. A boiler fouling cleaning device according to claim 4, characterized in that: The liquid spraying mechanism (30) further comprises a plurality of piston cylinders (301), wherein the piston cylinders (301) are mounted on the side of the piston cylinder (216) via a fixing plate (302), wherein the interior of the piston cylinder (301) is slidably connected to a piston block (303), and a plurality of liquid holes (303a) are evenly distributed on the piston block (303), wherein each liquid hole (303a) is hingedly connected to a sealing sheet (304), and a movable member (304) is vertically fixed at the center of the piston block (303). The piston rod (305) is connected to the front end of the mounting cylinder (101), the front and rear ends of the piston cylinder (301) are respectively connected to a liquid outlet pipe (307) and a liquid inlet pipe (306), and the other end of the liquid outlet pipe (307) is connected to the side of the fixing ring (208), the rotating tube (201) is evenly distributed with liquid inlet grooves (201a) inside the fixing ring (208), and the liquid spray head (308) is installed at the front end of the rotating tube (201).

6. A boiler fouling cleaning device according to claim 1, characterized in that: The outer side of the cleaning shovel (203) is densely covered with cleaning hairs (204).

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