CN112570371B

CN112570371B - Ultrasonic cleaning device with feeding and discharging functions

Info

Publication number: CN112570371B
Application number: CN202011329934.1A
Authority: CN
Inventors: 丁晓波
Original assignee: Actfive Shanghai Washing Machine Co ltd
Current assignee: Actfive Shanghai Washing Machine Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2022-04-29
Anticipated expiration: 2040-11-24
Also published as: CN112570371A

Abstract

The invention relates to the technical field of cleaning devices, in particular to an ultrasonic cleaning device with a feeding and discharging function, which comprises a cleaning machine body, an ultrasonic generator fixedly arranged on one side of the cleaning machine body and an energy converter electrically connected with the ultrasonic generator, wherein a cleaning tank is also arranged in the cleaning machine body; according to the invention, the feeding and discharging mechanism is arranged, so that the feeding and discharging actions of the cleaned workpiece are automatically carried out, manual holding is not required, and the vibration control mechanism is arranged, so that the workpieces with different sizes are cleaned by adopting different amplitude signals, and the electric energy is saved.

Description

Ultrasonic cleaning device with feeding and discharging functions

Technical Field

The invention relates to the technical field of cleaning devices, in particular to an ultrasonic cleaning device with a feeding and discharging function.

Background

The principle of the ultrasonic cleaning machine is that a high-frequency oscillation signal sent by an ultrasonic generator is converted into high-frequency mechanical oscillation through a transducer and is transmitted into a medium, namely a cleaning solvent, ultrasonic waves are radiated forwards at intervals in a cleaning liquid to make the liquid flow to generate tens of thousands of micro-bubbles with the diameter of 50-500 mu m, and the micro-bubbles in the liquid vibrate under the action of a sound field. These bubbles are formed and grown in a negative pressure region where the ultrasonic wave propagates in the longitudinal direction, and in a positive pressure region, when the sound pressure reaches a certain value, the bubbles rapidly increase and then suddenly close. When the bubbles are closed, shock waves are generated, thousands of atmospheric pressures are generated around the bubbles, insoluble dirt is damaged, and the insoluble dirt is dispersed in the cleaning liquid, and when the group particles are wrapped by the oil dirt and adhered to the surface of a cleaning piece, the oil is emulsified, solid particles are separated, so that the aim of cleaning the cleaning piece is fulfilled.

When the ultrasonic cleaning device is used for machining, the utilization rate of the pipe fitting is very high, the existing pipe fitting is cleaned by an ultrasonic cleaning machine frequently, but the amplitude signal rating of the existing ultrasonic cleaning device is inconvenient or is changed according to manual adjustment, the former consumes a large amount of electric energy by adopting high power when processing a small workpiece, and the latter is poor in manual adjustment accuracy, so that the cleaning effect on the workpiece is poor easily.

Disclosure of Invention

The invention aims to provide an ultrasonic cleaning device with a feeding and discharging function, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

an ultrasonic cleaning device with a feeding and discharging function comprises a cleaning machine body, an ultrasonic generator fixedly arranged on one side of the cleaning machine body and a transducer electrically connected with the ultrasonic generator, wherein a cleaning tank is also arranged in the cleaning machine body, a feeding and discharging mechanism is arranged in the cleaning tank, the feeding and discharging mechanism comprises a feeding box and a discharging box fixedly arranged on the cleaning machine body and a middle barrel rotatably arranged in the cleaning tank, a feeding port and a discharging port respectively communicated with the feeding box and the discharging box are arranged in the middle barrel, the feeding and discharging mechanism also comprises a barrel basket coaxially and rotatably arranged with the middle barrel, two electric telescopic rods are symmetrically and fixedly arranged on the barrel basket, a barrier plate penetrating through the barrel basket is fixedly arranged at the output end of each electric telescopic rod, a vibration control mechanism is also arranged in the cleaning machine body and comprises a processor fixedly arranged on the cleaning machine body and a film adhered on one side of the cleaning tank, film one side fixed mounting has the rack, elastic connection between rack and the cleaning machine body, the cleaning machine body internal rotation install with rack engaged with a gear, the coaxial fixed mounting of a gear has the carousel, fixed mounting has the conducting ring on the carousel, the equidistance is equipped with a plurality of contacts in the conducting ring, shake accuse mechanism still include with the cleaning machine body articulated and with contact matched with conducting rod, the articulated department of conducting rod is equipped with the torsional spring, conducting rod one side is equipped with drive mechanism.

Further: angles are arranged between the feeding port and the middle barrel and between the discharging port and the middle barrel.

Further: two second fan blades are coaxially and fixedly arranged on two sides of the bucket basket.

Further: sliding mounting has the closing plate in the discharge gate, closing plate one side integrated into one piece has the tooth, the middle bucket internal rotation is installed and is engaged with the closing plate No. two gears, be equipped with the step motor who is used for driving No. two gears in the middle bucket, equal equidistance symmetry articulates in pan feeding mouth and the discharge gate has a plurality of buffer beam, and wherein one side equidistance of one side buffer beam is equipped with a plurality of fans.

And further: a conical groove is formed in the cleaning groove, and the film is bonded to the small-diameter end of the conical groove.

And further: the driving mechanism comprises a rod groove and a movable rod, one end of the movable rod is slidably inserted into the rod groove, the rod groove is formed in one side of the cleaning machine body, a clamping groove is formed in the rod groove, clamping strips matched with the clamping groove are symmetrically arranged on the movable rod, the movable rod is elastically connected with the rod groove, and one end of the movable rod is connected with one end of the conductive rod through a connecting rope.

And further: the cleaning machine is characterized in that a fan blade is arranged under the bucket basket, the fan blade is rotatably installed on the cleaning machine body, a plurality of brushes are fixedly installed on the fan blade in the circumferential direction, and the brushes are in sliding fit with the bucket basket.

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

1. the invention arranges an ultrasonic generator, an energy converter, a cleaning tank, a feeding box, a discharging box, a processor, a film, a rack, a first gear, a turntable, a conductive ring, a contact, a conductive rod, a feeding port, a discharging port, a middle barrel, a barrel basket and an electric telescopic rod, a workpiece to be cleaned is put into the feeding box, under the action of gravity, the workpiece falls into the barrel basket from the feeding port, and is acted by the ultrasonic generator, a rated initial amplitude signal lasts for a certain time, an electric signal is converted into a mechanical vibration signal through the energy converter, and the mechanical vibration signal is transmitted through a cleaning liquid, so that the cleaning liquid is in a wave-flower type one-way motion mode, further the cleaning work of the surface of the workpiece is realized, and meanwhile, the mechanical vibration signal is in conflict with the film through the transmission of the cleaning liquid, under the meshing action between the rack and the first gear, make the carousel rotate, and then drive the conducting ring and rotate, make the contact and the conducting rod contact of different positions on the conducting ring, and the effect through the treater, will be in supersonic generator with rated amplitude signal operating time, supersonic generator's the best cleaning signal as the work piece that corresponds with the longest contact of conducting rod contact time, thereby realize the cleaning process work of different amplitude signals to the work piece realization of different sizes of volume, avoid the loss of electric energy, and pass through electric telescopic handle, it stretches out to drive the barrier plate, and realize the barrier effect to the work piece in the bucket basket, and through rotating the bucket basket, make the work piece of washing completion realize the work of the ejection of compact falling into the discharge gate.

2. According to the invention, the buffer rod, the closing plate, the fan, the second gear and the second fan blade are arranged, the second fan blade is rotated under the condition that mechanical vibration is transmitted to cleaning liquid to cause water waves, so that the bucket basket is driven to rotate, the direction of the surface of a workpiece is changed, the cleaning effect is enhanced, the second gear is driven to rotate through the rotation of the stepping motor, the closing plate is further extended out, the cleaned workpiece can conveniently fall into the discharge port to enter the discharge box, the speed of the workpiece falling from the feeding port or falling into the discharge port is slowed down through the arrangement of the buffer rod, the damage to the surface of the workpiece caused by direct falling is avoided, the fan is arranged in the discharge port, the drying work is carried out on the surface of the workpiece, and the secondary manual treatment work in the later stage is reduced.

3. According to the invention, by arranging the conical groove, the movable rod, the clamping strip and the rod groove, and by arranging the conical groove, a mechanical vibration signal is superposed and amplified in the conical groove at the other end of the cleaning groove in a cleaning liquid transmission mode and generates an interference effect with the film, and by rotating the movable rod, the clamping strip corresponds to the position of the clamping groove, so that the movable rod slides towards the inside of the rod groove under the elastic action, and the conductive rod is released and is contacted with the conductive ring under the action of the connecting rope to adjust the vibration signal, so that the conductive rod is prevented from being contacted with the conductive ring for a long time when the whole device is not operated, and the electric energy is saved.

4. According to the invention, the first fan blade and the brush are arranged, so that moving water waves collide with the first fan blade while the energy converter generates mechanical vibration, the first fan blade continuously rotates, the brush is driven to rotate and contact with the surface of a workpiece, the surface of the workpiece is scrubbed, and the cleaning effect on the workpiece is further improved.

Drawings

FIG. 1 is a schematic structural view of an ultrasonic cleaning apparatus with a loading and unloading function;

FIG. 2 is a partial top view of an ultrasonic cleaning apparatus with loading and unloading functions;

FIG. 3 is an enlarged partial structural view of a portion A of the ultrasonic cleaning apparatus with loading and unloading functions;

FIG. 4 is an enlarged partial structural view of a portion B of the ultrasonic cleaning apparatus with loading and unloading functions;

FIG. 5 is an enlarged partial structural view of a portion C of the ultrasonic cleaning apparatus with loading and unloading functions;

fig. 6 is an assembly view of a first gear and a turntable in the ultrasonic cleaning device with the loading and unloading functions.

The reference numerals in the schematic drawings illustrate:

1-a cleaning machine body, 2-an ultrasonic generator, 3-a transducer, 4-a cleaning tank, 5-a feeding tank, 6-a discharging tank, 7-a conical tank, 8-a processor, 9-a film, 10-a rack, 11-a gear, 12-a rotating disc, 13-a movable rod, 14-a clamping strip, 15-a rod groove, 16-a conductive ring, 17-a contact, 18-a conductive rod, 19-a feeding port, 20-a discharging port, 21-a middle barrel, 22-a buffer rod, 23-a sealing plate, 24-a second gear, 25-a fan, 26-a first fan blade, 27-a brush, 28-a barrel basket, 29-an electric telescopic rod and 30-a second fan blade.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention, and the present invention is further described with reference to the embodiments below.

Referring to fig. 1, 2, 3 and 6, in an embodiment of the present invention, an ultrasonic cleaning apparatus with a feeding and discharging function includes a cleaning apparatus body 1, an ultrasonic generator 2 fixedly installed at one side of the cleaning apparatus body 1, and an energy converter 3 electrically connected to the ultrasonic generator 2, a cleaning tank 4 is further disposed in the cleaning apparatus body 1, a feeding and discharging mechanism is disposed in the cleaning tank 4, the feeding and discharging mechanism includes a feeding box 5 and a discharging box 6 fixedly installed on the cleaning apparatus body 1, and a middle barrel 21 rotatably installed in the cleaning tank 4, a feeding port 19 and a discharging port 20 respectively communicated with the feeding box 5 and the discharging box 6 are disposed in the middle barrel 21, an angle is disposed between the feeding port 19 and the discharging port 20 and the middle barrel 21, the feeding and discharging mechanism further includes a barrel basket 28 coaxially and rotatably installed with the middle barrel 21, two electric telescopic rods 29 are symmetrically and fixedly mounted on the barrel basket 28, a blocking plate penetrating through the barrel basket 28 is fixedly mounted at the output end of each electric telescopic rod 29, a vibration control mechanism is further arranged in the cleaning machine body 1 and comprises a processor 8 fixedly mounted on the cleaning machine body 1 and a film 9 adhered to one side of the cleaning tank 4, a rack 14 is fixedly mounted on one side of the film 9, the rack 14 is elastically connected with the cleaning machine body 1, a first gear 11 meshed with the rack 14 is rotatably mounted in the cleaning machine body 1, a rotary disc 12 is coaxially and fixedly mounted on the first gear 11, a conductive ring 16 is fixedly mounted on the rotary disc 12, a plurality of contacts 17 are arranged in the conductive ring 16 at equal intervals, the vibration control mechanism further comprises a conductive rod 18 hinged with the cleaning machine body 1 and matched with the contacts 17, and a torsional spring is arranged at the hinged position of the conductive rod 18, the contact points 17 at different positions in the conducting ring 16 are in contact with the conducting rod 18 and correspond to the ultrasonic generator 2 to emit signals with different amplitudes, and a transmission mechanism is arranged on one side of the conducting rod 18 and used for controlling the conducting rod 18 to move.

In practical application, a workpiece to be cleaned is put into the feeding box 5, under the action of gravity, the workpiece falls into the bucket basket 28 from the feeding port 19, and is acted by the ultrasonic generator 2, and continues for a certain time with a rated initial amplitude signal, and an electrical signal is converted into a mechanical vibration signal through the transducer 3, and is transmitted through the cleaning liquid, so that the cleaning liquid is in a wave-flower type unidirectional motion manner, and further the cleaning work of the workpiece surface is realized, and meanwhile, the mechanical vibration signal is in conflict action with a film through the cleaning liquid transmission, under the meshing action between the rack 10 and the first gear 11, the turntable 12 is rotated, and further the conductive ring 16 is driven to rotate, so that contacts at different positions on the conductive ring 16 are in contact with the conductive rod 18, and within the working time of the ultrasonic generator 2 with the rated amplitude signal through the action of the processor 8, the amplitude signal of the ultrasonic generator 2 corresponding to the contact 17 with the longest contact time of the conducting rod 18 is used as the best cleaning signal of the workpiece, so that the cleaning processing work of different amplitude signals for the workpieces with different volume sizes is realized, the loss of electric energy is avoided, the electric telescopic rod 29 is used for driving the barrier plate to extend out, the barrier effect on the workpieces in the barrel basket 28 is realized, and the cleaned workpieces fall into the discharge port 20 to realize the discharge work by rotating the barrel basket 28.

Further, referring to fig. 1, fig. 2 and fig. 4, as a preferred embodiment of the present invention, two second fan blades 30 are coaxially and fixedly installed on two sides of the bucket basket 28, a closing plate 23 is slidably installed in the discharge port 20, teeth are integrally formed on one side of the closing plate 23, a second gear 24 engaged with the closing plate 23 is rotatably installed in the intermediate bucket 21, a stepping motor for driving the second gear 24 is installed in the intermediate bucket 21, a plurality of buffer rods 22 are symmetrically hinged in the feed port 19 and the discharge port 20 at equal intervals, and a plurality of fans 25 are installed on one side of the buffer rod 22 at one side at equal intervals.

When in actual application, thereby transmit for the washing liquid through mechanical vibration and cause under the unrestrained condition of water, make No. two flabellum 30 rotate, thereby drive bucket basket 28 and rotate, the realization is to the change of workpiece surface orientation, strengthen the cleaning performance, and rotate through step motor, drive No. two gears 24 and rotate, and then make the closing plate 23 stretch out, the work piece that conveniently washs the completion falls into discharge gate 20 and gets into out workbin 6 in, and through setting up buffer beam 22, thereby slow down the speed that the work piece fell down or fall into discharge gate 20 from pan feeding mouth 19, avoid directly falling down to lead to workpiece surface to receive the damage, and set up fan 25 in discharge gate 20, thereby carry out drying work to workpiece surface, reduce the artificial secondary treatment work in later stage.

Further, referring to fig. 1 and 3, as a preferred embodiment of the present invention, a tapered groove 7 is disposed in the cleaning tank 4, the film 9 is bonded to a small diameter end of the tapered groove 9, the transmission mechanism includes a rod groove 15 and a movable rod 13 having one end slidably inserted into the rod groove 15, the rod groove 15 is disposed on one side of the cleaning machine body 1, a clamping groove is disposed in the rod groove 15, clamping strips 14 matched with the clamping groove are symmetrically disposed on the movable rod 13, the movable rod 13 is elastically connected to the rod groove 15, and one end of the movable rod 13 is connected to one end of the conductive rod 18 through a connecting rope.

In the time of practical application, through setting up tapered groove 7, thereby can superpose in the tapered groove 7 of the other end of mechanical vibration signal through washing liquid driven mode washing tank 4 and enlarge, and take place conflict effect with film 9, and through rotating movable rod 13, make card strip 14 correspond the draw-in groove position, and then under the elastic action, make movable rod 13 slide to rod groove 15 inside, thereby under the effect through connecting the rope, make conducting rod 18 release, and contact with conducting ring 16, carry out vibration signal's regulation work, when avoiding whole device not working, conducting rod 18 and conducting ring 16 contact for a long time, thereby guarantee the saving to the electric energy.

Further, referring to fig. 1 and 5, as a preferred embodiment of the present invention, a first fan blade 26 is disposed right below the tub basket 28, the first fan blade 26 is rotatably mounted on the cleaning machine body 1, a plurality of brushes 27 are fixedly mounted on the first fan blade 26 in the circumferential direction, and the brushes 27 are slidably engaged with the tub basket 28.

When in actual application, when the energy converter 3 sends out mechanical vibration, the water wave of motion collides the first fan blade 26, so that the first fan blade 26 continuously rotates, and then the brush 27 is driven to rotate and contact with the surface of the workpiece, thereby brushing the surface of the workpiece, and further improving the cleaning effect on the workpiece.

With the above embodiment, the working principle of the present invention is as follows:

when the cleaning machine is used, a workpiece to be cleaned is put into the feeding box 5, the workpiece falls into the bucket basket 28 from the feeding port 19 under the action of gravity, and is acted by the ultrasonic generator 2, a rated initial amplitude signal lasts for a certain time, an electric signal is converted into a mechanical vibration signal through the energy converter 3, and the mechanical vibration signal is transmitted through the cleaning liquid, so that the cleaning liquid is in a wave-flower type one-way motion mode, the surface of the workpiece is cleaned, meanwhile, the mechanical vibration signal is in collision with a film through the transmission of the cleaning liquid, under the meshing action between the rack 10 and the first gear 11, the turntable 12 is rotated, the conductive ring 16 is driven to rotate, contacts at different positions on the conductive ring 16 are in contact with the conductive rod 18, and the ultrasonic generator 2 is operated under the action of the processor 8 under the rated amplitude signal within the working time, the amplitude signal of the ultrasonic generator 2 corresponding to the contact 17 with the conductive rod 18 with the longest contact time is used as the best cleaning signal of the workpiece, so as to realize the cleaning treatment work of different amplitude signals for workpieces with different volume sizes, avoid the loss of electric energy, pass through the electric telescopic rod 29, drive the barrier plate to extend out, and realize the barrier effect for the workpiece in the bucket basket 28, transmit the cleaning solution through mechanical vibration, thereby causing the condition of water wave, so as to rotate the second fan blade 30, thereby driving the bucket basket 28 to rotate, realizing the change of the surface orientation of the workpiece, enhancing the cleaning effect, and rotate through the stepping motor, drive the second gear 24 to rotate, further extend the sealing plate 23, the workpiece which is conveniently cleaned falls into the discharge port 20 to enter the discharge box 6, and through the arrangement of the buffer rod 22, thereby reducing the speed of the workpiece when falling from the feeding port 19 or falling into the discharge port 20, avoid direct falling to lead to workpiece surface to receive the damage, and set up fan 25 in discharge gate 20, thereby carry out drying work to workpiece surface, reduce the artificial secondary treatment work in later stage, when energy converter 3 sends mechanical vibration, make the unrestrained collision effect to a flabellum 26 of water of motion, thereby make a flabellum 26 constantly rotate, and then drive brush 27 and rotate and with workpiece surface contact, thereby scrub the work to workpiece surface, further improved the cleaning performance to the work piece.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An ultrasonic cleaning device with feeding and discharging functions comprises a cleaning machine body (1), an ultrasonic generator (2) fixedly installed on one side of the cleaning machine body (1) and an energy converter (3) electrically connected with the ultrasonic generator (2), and is characterized in that a cleaning tank (4) is further arranged in the cleaning machine body (1), a feeding and discharging mechanism is arranged in the cleaning tank (4), the feeding and discharging mechanism comprises a feeding box (5) and a discharging box (6) fixedly installed on the cleaning machine body (1) and an intermediate barrel (21) rotatably installed in the cleaning tank (4), a feeding opening (19) and a discharging opening (20) which are respectively communicated with the feeding box (5) and the discharging box (6) are arranged in the intermediate barrel (21), and the feeding and discharging mechanism further comprises a barrel basket (28) coaxially rotatably installed with the intermediate barrel (21), the cleaning machine is characterized in that two electric telescopic rods (29) are symmetrically and fixedly mounted on the barrel basket (28), a stop plate penetrating through the barrel basket (28) is fixedly mounted at the output end of each electric telescopic rod (29), a vibration control mechanism is further arranged in the cleaning machine body (1), the vibration control mechanism comprises a processor (8) fixedly mounted on the cleaning machine body (1) and a film (9) bonded on one side of the cleaning tank (4), a rack (10) is fixedly mounted on one side of the film (9), the rack (10) is elastically connected with the cleaning machine body (1), a gear (11) meshed with the rack (10) is rotatably mounted in the cleaning machine body (1), a turntable (12) is coaxially and fixedly mounted on the gear (11), a rotary table (16) is fixedly mounted on the turntable (12), and a plurality of contacts (17) are equidistantly arranged in the conductive ring (16), the vibration control mechanism further comprises a conductive rod (18) which is hinged with the cleaning machine body (1) and is matched with the contact (17), a torsional spring is arranged at the hinged position of the conductive rod (18), and a transmission mechanism is arranged on one side of the conductive rod (18).

2. The ultrasonic cleaning device with the feeding and discharging functions as claimed in claim 1, wherein an angle is formed between each of the feeding port (19) and the discharging port (20) and the intermediate barrel (21).

3. The ultrasonic cleaning device with the feeding and discharging functions as claimed in claim 1, wherein two second fan blades (30) are coaxially and fixedly mounted on two sides of the bucket basket (28).

4. The ultrasonic cleaning device with the feeding and discharging functions as claimed in claim 1, wherein a closing plate (23) is slidably mounted in the discharging port (20), teeth are integrally formed on one side of the closing plate (23), a second gear (24) meshed with the closing plate (23) is rotatably mounted in the intermediate barrel (21), a stepping motor for driving the second gear (24) is arranged in the intermediate barrel (21), a plurality of buffer rods (22) are symmetrically hinged in the feeding port (19) and the discharging port (20) at equal intervals, and a plurality of fans (25) are arranged on one side of each buffer rod (22) at equal intervals.

5. The ultrasonic cleaning device with the feeding and discharging function as claimed in claim 1, wherein a tapered groove (7) is provided in the cleaning tank (4), and the thin film (9) is bonded to a small diameter end of the tapered groove (7).

6. The ultrasonic cleaning device with the feeding and discharging functions as claimed in claim 1, wherein the transmission mechanism comprises a rod groove (15) and a movable rod (13) with one end slidably inserted in the rod groove (15), the rod groove (15) is arranged on one side of the cleaning machine body (1), a clamping groove is formed in the rod groove (15), clamping strips (14) matched with the clamping groove are symmetrically arranged on the movable rod (13), the movable rod (13) is elastically connected with the rod groove (15), and one end of the movable rod (13) is connected with one end of the conductive rod (18) through a connecting rope.

7. The ultrasonic cleaning device with the feeding and discharging function as claimed in any one of claims 1 to 6, wherein a first fan blade (26) is arranged right below the bucket basket (28), the first fan blade (26) is rotatably installed on the cleaning machine body (1), a plurality of brushes (27) are fixedly installed on the first fan blade (26) in the circumferential direction, and the brushes (27) are in sliding fit with the bucket basket (28).