KR20200103560A - Brush assembly - Google Patents

Abstract

An object of the present invention is a brush assembly for treating a surface of a work piece (1). To this end, the brush assembly comprises a rotatable brush holder (5), and ring brushes (6 and 8) having an annular array (6) consisting of outwardly protruding bristles (7). According to the present invention, it is preferable that the ring brushes (6 and 8) are designed to reciprocate in the axial direction.

Description

Brush assembly {BRUSH ASSEMBLY}

The present invention relates to a brush assembly for treating a surface of a work piece using a rotationally driveable brush holder holding a ring brush having an annular array of bristles protruding radially outward.

Such brush assemblies are generally used to free the surface of the work piece in question from, for example, corrosion, paint or similar coating, or to provide a desired depth of roughness to the work piece surface. The general prior art according to the applicant's patent EP 1 834 733 [US 9,554,642] describes a brush assembly equipped with a stop therefor. This makes it possible to achieve a roughness depth that previously could only be achieved by sand blasting. The displayed roughness depth is collectively referred to as the average roughness value Ra (the arithmetic average of the absolute values of the profile deviations within the sampling length according to DIN 4764 and DIN ISO 1302). These roughness depths have been found to be reliable in principle and are widely used in practice. Another patent EP 2 618 965 [US 9,918,544] by the applicant of the present invention also shows a similar prior art in which the stopper simultaneously acts as an abrasive body for bristles. The stops for this application are designed to be displaceable, for example displaced in the radial and/or tangential directions.

The brush assembly and the rotary brush tool to which such a brush assembly is mounted can be used fixedly in connection with, for example, a machine in a machine room. However, it is also possible for the rotary brush tool to be discussed to be designed for manual operation. In both cases, it is often problematic in practice to guide the brush assembly along the surface of the workpiece to be machined, in particular the workpiece. As described, this can be done mechanically and/or manually. As a result, there is often a risk of formation of score marks or at least a uniform structure on the surface of the work piece. This is detrimental to uniform surface treatment and may make subsequent adhesion of coatings, paints, etc. difficult. This is the reason the present invention was conceived.

The present invention is based on a technical object, such as to further develop the brush assembly described above for treating the surface of a work piece in such a way that a uniformly treated surface is available.

To achieve this technical object, the brush assembly of the general type described above is characterized in that, in the context of the present invention, the ring brush is movable. Generally, ring brushes are reciprocating.

The invention proceeds from the discovery that the ring brush is held with the aid of a rotatable brush holder. Thus, the movement of the ring brush provided according to the present invention indicates that the rotationally driveable brush holder holding the ring brush performs an adjustment movement in addition to its rotational movement. In general, the ring brush is preferably reciprocally movable. As a result, by reciprocating the ring brush, in particular the brush holder holding the ring brush, in combination with the forward movement made manually and/or by the machine, the surface of the machined workpiece is uniformly machined and roughness The depth is evenly distributed to achieve the overall effect observed.

According to an advantageous embodiment, the ring brush may be movable radially and/or axially. In general, only ring brushes and, consequently, axial movements of the brush holders receiving and holding the ring brushes are employed at this time. This allows for further radial movement of the ring brush in order to place the brush assembly and consequently the ring brush against the surface of the individual workpiece to be treated, in particular the workpiece, although in practice it is only used in machine-operated brush assemblies. It means to be. However, according to the invention, a manually operated brush assembly and consequently in particular a manually operated rotary brush tool are the main considerations. These rotary brush tools are equipped with a brush assembly under discussion and an additional drive for the brush assembly.

In fact, such a manually operated rotary brush tool can be designed as a whole, as a portable power tool or as a manually operated rotary brush tool. To this end, a drive unit with an electric motor is generally used, advantageously with an optional geared transmission powered by one or more rechargeable batteries. In principle, manually operated rotary brush tools can also be driven pneumatically. Either way, the movement of the rotary brush tool and consequently the brush assembly is generally carried out using the hand. The work of moving or placing the brush assembly by arbitrarily adjusting it in the radial direction against the surface of the workpiece to be machined is also performed manually. Conversely, the movement of the ring brush, in particular the axial movement of the ring brush, is carried out with the aid of a motor-powered means, in particular a drive, which is not particularly limited as long as it rotates the brush holder and consequently the ring brush. This means, according to the invention, that the drive constituting a part of the rotary brush tool on which the brush assembly is mounted rotates on the brush holder on the one hand, and reciprocates, preferably in the axial direction, on the other hand. do. To this end, the drive is equipped with a motor for rotation, in particular an electric motor, for example, and may be equipped with an additional motor for axial reciprocating motion, in particular an electric motor. However, it is also possible that these two kinds of movements are achieved and affected by a single electric motor.

As described above, the ring brush is mainly movable in the axial direction, where a reciprocating motion is generally employed. That is, the shaft of the brush holder supporting or holding the ring brush is reciprocated back and forth in the axial direction with the help of the driving unit. This axial reciprocating motion can follow a sinusoidal movement over time. This sinusoidal movement can be effected, for example, by actuation of the cap on the axis of the shaft of the brush holder and consequently of the axis of the ring brush by acting against the force of the spring. It can be achieved and implemented in a particularly advantageous manner by allowing the axis of the to move. In fact, the ring brush and brush holder are each generally designed to rotate symmetrically and coaxially with one another.

In order to be able to specifically implement and achieve the aforementioned axial movement of the ring brush of the brush holder, the brush holder is generally employed in at least two parts. In practice, the brush holder mainly consists of a fixed bearing part and a brush part which can be displaced axially relative thereto. The brush portion of the brush holder is primarily provided for guiding and holding the ring brush, while the fixed bearing portion mainly and exclusively serves as a bearing function for the brush portion. Accordingly, while the fixed bearing part is designed to be fixed, the brush part is designed to rotate as well as movable in the axial direction, so that the ring brush is rotated.

Specifically, for this purpose, the fixed bearing portion is provided with a spline bore in which the spline shaft of the brush portion movable in the axial direction engages therein. The shaft of the brush portion that can be displaced in the axial direction is provided in a hanging shape and may be connected to the base of the brush portion that is displaceable. This allows the fixed bearing part with splined bore to perform the necessary rotational movement on the shaft for the ring brush.

In another embodiment, for this purpose, the fixed bearing part also has a sleeve for a drive shaft that engages therein, the drive shaft being adapted to rotate and axially move by the drive. In addition, although not often, since the axial load is applied by the reciprocating motion, the drive shaft rotates with the aid of the driving unit and reciprocates in the axial direction.

In order to specifically achieve and implement this action, the sleeve is generally provided with a groove in which a ridge, which is radially connected to the drive shaft, engages. As a result, the sleeve and the drive shaft provide a frictional engagement in the direction of rotation, on the one hand, so that the ring brush supported by the brush part can be driven rotationally as desired. At the same time, on the other hand, by means of an interference fit between the groove and the ridge engaged in this groove, it is ensured that the drive shaft is capable of carrying out the desired axial movement relative to the sleeve and consequently to the fixed bearing part. do. This also ensures that together with the sleeve, the drive shaft also rotates. To this end, at least two splines radially connected to the drive shaft engage complementarily in corresponding grooves of the sleeve. In principle, approaches other than those described above from a structural point of view are of course possible.

In the present invention, there is also provided a stop buried within the rotating annular bristle array, which ensures that the rotating bristles and/or the brush belt supporting the bristle are elastically deformed as part of the ring brush. Especially important. Consequently, since it is possible for the bristles and/or brush belts to store kinetic energy, after the bristles and brush belts are released, the bristles are not only rotated, but as a result of the stored kinetic energy released after passage of the stop. Treat the surface of the workpiece by collision. For illustrative purposes, the basic functionality of this stop is already described in the applicant's patent EP 1 834 733 referenced above.

According to the invention, the stop can also be designed to be movable, as is known in principle through EP 2 618 965, which is also cited in the introduction of this specification. To specifically implement the movement of the stop, the stop can generally be moved radially in a manner that changes the spacing therebetween with respect to the axis of the rotating ring brush. This radial actuating movement can be specifically implemented in such a way that the stop is moved with the aid of an eccentric and/or linear actuator.

Due to the additional and optional possibility of the present invention of implementing and moving the stop, not only the surface is treated uniformly in terms of the roughness profile generated, but rather, the movement of the stop in the radial direction relative to the axis of the ring brush is also, An option exists that results in a change in kinetic energy that causes the bristles to impinge on the surface of the workpiece to be treated.

According to the rule of thumb generally applied in this context, the shorter the radial spacing between the axis and the stop of the ring brush, which is the subject of discussion, the greater the kinetic energy. The reason for this is that when the stopper is disposed at an inner position in the radial direction, the deformation of the bristles increases and strengthens, and as a result, the kinetic energy that causes the bristles to act on the surface of the work piece increases.

For these basic relationships, Robert J. Researched by Professor Robert J. Stango and others, it has been published in several publications. 2010 NACE Corrosion Industry Association and Exposition Paper No. 10385 "Surface preparation of ship-construction steel/(ABS-A) via bristle blasting process through bristle blasting process )" and "Evaluation of bristle blasting process for surface preparation of ship-construction steel" in paper number C2012-0001442 of the NACE Corrosion Industry Association and Fair 2012. Refer to dog publications. According to a preferred embodiment, the stop is designed for this purpose in such a way that it is mostly radially movable with respect to the axis of the rotating ring brush and/or can be moved radially with respect to the axis. Similarly, the ring brush can also be placed against the surface and/or can move axially.

The present invention also relates to a rotary brush tool, and more particularly to a manually operated rotary brush tool equipped with the aforementioned brush assembly and a drive for the brush assembly. In particular, such a rotary brush tool can be designed to be portable if the drive is electrically actuated and a rechargeable battery provided in the machine housing or at least one rechargeable battery is mounted on the power source. There is a fundamental advantage here.

The invention is described in more detail below with reference to a schematic diagram showing only one embodiment.
1 is a schematic side view of a brush assembly and a corresponding rotary brush tool according to the invention.
2 shows a first design variant of the stop and the adjuster for the stop.
3 shows a second modification of the adjuster for the stop.
Figure 4 is a schematic diagram of a drive according to the present invention for rotation and axial reciprocating motion of the brush assembly.

First of all, FIG. 1 shows a fairly schematic view of a brush assembly according to the invention for treating the surface of a workpiece 1. For the purposes described above, the brush assembly is connected to the machine housing 2 of the rotary brush tool. According to this embodiment, on the one hand, the drive part 3 is arranged inside the machine housing 2 of the rotary brush tool, and on the other hand the power supply 4 for the drive part 3 operated by electricity is the housing. Is placed inside. The power source 4 may be one or more rechargeable batteries. Each of these one or more rechargeable batteries may be charged in an inductive manner through a charging socket inside or outside the machine housing 2, or may be charged by moving from the machine housing 2 to an external charging cradle. have. However, in principle, although not shown, the drive unit 3 may function pneumatically. The rotary brush tool with the illustrated machine housing 2 is advantageously a manually operated rotary brush tool, ie a properly designed, handheld tool.

Specifically, the brush assembly comprises a rotatable brush holder 5 with a web as seen in FIG. 1. Ring brushes (6, 8) consisting of an array (6) of bristles (7) protruding radially outward are held against the brush holder (5) or on the brush holder (5) and rotated by the drive (3) It is driven. This corresponds to a clockwise rotational movement or a rotational direction (D) movement as shown in FIG. 1. The individual bristles 7 are fixed to the annular belt 8 of the ring brushes 6 and 8.

In this embodiment according to FIG. 1 it is also possible to see a stop 9 buried in a rotating annular array 6 of bristles 7. According to this embodiment, the stop 9 is movable and, in particular, can be moved in a radial direction R indicated by a double arrow in FIG. 1. As already explained in the introduction and extensively described in the prior art according to EP 1 834 733, the bristles 7 and optionally the brush belt 8 pass over the stop 9 and are shown by arrows in FIG. It is elastically deformed during rotation in the counterclockwise rotation direction (D). As a result, kinetic energy caused by the associated elastic deformation is stored in the bristles 7 and in the brush belt 8. After the release of the bristles and brush belt, the bristles 7 consequently affect the surface of the workpiece 1 not only in a rotational manner, but also in an impact manner. In other words, after passing through the stop 9, the pre-stored kinetic energy is released.

According to the present invention, the ring brushes 6 and 8 can be moved as shown in detail in FIG. 3. In fact, the ring brushes 6, 8 are designed to reciprocate in the axial direction. The drive 3 ensures this reciprocating motion.

According to the embodiment shown in Fig. 4, the drive unit 3 initially has, for the above-described purposes, the ring brushes 6 and 8 shown in Fig. 4, in particular, the brush holder 5 in the above-described rotation direction ( A gear wheel 10 is mounted to rotate with D). For this purpose, the spline bore of the sleeve B of the bearing part 5a fixed in the axial direction, in which the gear wheel 10 acts on the drive shaft 12 to be described in detail later and constitutes part of the brush holder 5 Engages in (13). In addition to the fixed bearing part 5a, a brush part 5b movable in the axial direction to which the drive shaft 12 belongs is also implemented. The drive 3 also ensures that the drive shaft 12 under discussion is not only rotationally driven to obtain a rotational motion D, but also generates the aforementioned movement in the axial direction A further.

To this end, an eccentric cam forming portion 11' that can be rotated about an axis by the driving portion 3 is provided on the eccentric gear wheel 11, and this eccentric gear wheel is the movable brush portion 5b. It is acted on by the drive 3 as an additional component. The eccentric cam forming part 11' acts in the axial direction A on the drive shaft 12 through the pin Z. As a result, the drive shaft 12 and also the brush holder 5 reciprocate in the axial direction A, in addition to the rotational motion D. In order to be able to implement the movement of the brush holder 5 in the axial direction (A) and also rotation in the rotation direction (D), the gear wheel 10 and the eccentric wheel 11 acted on by the drive unit 3 ) Is provided with a corresponding toothed portion for driving by the drive unit 3, respectively.

As described above, the brush holder 5 has a two-part design according to this embodiment. Specifically, the brush holder 5 includes a bearing portion 5a fixed in the axial direction and a brush portion 5b movable in the axial direction. The fixed bearing part 5a has a movable bearing part 5b, in particular a spline bore 13 for the aforementioned pin Z of the gear wheel 11. Further, the drive shaft 12 engages the splined bore 13 in the vicinity of the sleeve B, and with the help of this drive shaft 12, the brush holder 5 is ultimately driven.

The drive 3 operates on both the gear wheel 10 and the eccentric wheel 11. The sleeve B is set to rotate through the gear wheel 10. This also applies to the bearing part 5a fixed in the axial direction. The drive shaft 12 engages the splined bore 13 of the sleeve B. To this end, a spline 14 protruding radially outward on the drive shaft 12 is fitted into a complementary axial groove 14 ′ of the spline bore 13. As a result, the drive shaft 12 is rotated in the direction of rotation D.

An additional axial movement of the drive shaft 12 in the axial direction A is achieved with the aid of an additional eccentric wheel 11 as shown by the double arrow in FIG. 4. To this end, the eccentric wheel 11 is also rotated by means of a drive 3. The eccentric wheel 11 has one or more eccentric cam forming portions 11 ′ that interact with the fixed housing cam forming portions 2 ′ and protrude in the radial direction. In this way, the rotation of the eccentric wheel 11 is converted into an axial movement through the interaction between the cam formations 11 ′ and 2 ′. As a result, the pin Z engaged with the spline bore 13 also reciprocates in the axial direction A.

The pin Z acts on the drive shaft 12 by its round head, so that the drive shaft 12 follows the desired axial motion in the axial direction A in addition to the rotational motion in the rotational direction D. do. This movement is possible because the spline 14 engages radially in the associated groove 14', but at the same time permits the desired axial movement of the drive shaft 12 in the axial direction A. By means of an additional spring 15 it is ensured that in each stroke the axial movement of the drive shaft 12 is carried out against the force of the spring 15 returning the position of the drive shaft 12 to its place.

2 shows in detail a first embodiment of the manner in which the stop 9 moves in the radial direction R with respect to the annular bristle array 6 and bristle 7. To this end, the stop 9 is supported on an arm 16 with a bore engaging around the eccentric 17. Eventually, the eccentric part 17 is rotated by the driving part 3. And, by the rotation of the eccentric portion 17 in the bore of the arm 16, together with the additional guide portion 18 of the arm 16, the stop 9, as indicated by the corresponding arrow in FIG. It is ensured that) is moved in the radial direction (R) with respect to the annular bristle array 6 or bristle 7 and optionally also in an angular direction (U).

3 shows another variant for adjusting the stop 9 in the radial direction R for the ring brushes 6 and 8 and the bristles 7. To this end, the stop 9 is connected to the linear actuators 19, 20. Linear actuators (19, 20) is composed of a fixed spindle nut (19) and a spindle (20) that reciprocates in engagement with the spindle nut (19). As a result of the rotation of the spindle 20, according to this embodiment, in the direction indicated in Fig. 3, corresponding to the radial direction R for the ring brushes 6, 8 and the bristles 7, the stop ( The effect of moving the arm 16 supporting 9) occurs.

Claims (10)

As a brush assembly for treating the surface of the work piece 1,
A ring brush (6, 8) having an annular array (6) consisting of a rotatable brush holder (5) and bristles (7) protruding outward,
The brush assembly in which the ring brushes (6, 8) are preferably designed to be reciprocating. The method of claim 1,
Brush assembly, characterized in that the ring brushes (6, 8) are movable radially and/or axially. The method of claim 2,
For axial movement of the ring brushes (6, 8), the brush holder (5) is a design consisting of at least two parts having a fixed bearing part (5a) and a brush part (5b) movable in the axial direction Brush assembly, characterized in that having a. The method of claim 3,
The axially fixed bearing part 5a has a splined bore 13 for the pin Z of the movable brush part 5b engaged therein. . The method according to claim 3 or 4,
The fixed bearing part 5a also has a sleeve B for a drive shaft 12 that engages therein, the drive shaft 12 being rotatable by means of a drive part 3 and axially Brush assembly, characterized in that the reciprocating motion is possible. The method according to any one of claims 1 to 5,
A stop buried in the rotating annular bristle array 6 elastically deforming the bristles 7 and/or brush belt 8 as part of the ring brushes 6, 8 while storing kinetic energy Letting stop (9)
Brush assembly, characterized in that provided. The method of claim 6,
Brush assembly, characterized in that the stop (9) is movable. The method of claim 7,
The stopper (9) is a brush assembly, characterized in that movable in the radial direction (R) with respect to the axis of rotation of the ring brush (6, 8). The method according to claim 7 or 8,
Brush assembly, characterized in that the stop (9) is moved by an eccentric (17) and/or a linear actuator (19, 20). A rotary brush tool, in particular a manually operated rotary brush tool, comprising a brush assembly and a drive (3) for the brush assembly,
A rotary brush tool, characterized in that the brush assembly according to any one of claims 1 to 9 is employed.

Images