Brush roller for a centrifugal blasting installation

Abstract

Brush roller (100) for a centrifugal blasting system, comprising at least a carrier shaft (40) and at least two arc-shaped carrier ring segments (10) spaced apart from one another thereon, the carrier ring segments having a plurality of outwardly opening recesses (11) on their circumference in which at least one brush strip element (20) can be inserted, characterized in that: - the carrier shaft (40) is provided at at least two opposite locations on its circumference with at least one recess and / or an axially extending receiving groove (41); - the carrier ring segments (10) are each provided on their inner circumference in their two end regions with at least one projection (12) engaging in the recess or receiving groove (41);and - that the support ring segments (10) are deformable by adjusting the elasticity of the material and the cross-section in such a way that the projections (12) can be disengaged from the recess or receiving groove (41).

Description

[0001] The invention relates to a brush roller for a centrifugal blasting system with the features of the preamble of claim 1.

[0002] Such a brush roller is particularly needed in a roller conveyor shot blasting system, in which steel sheets, steel profiles, or other workpieces are treated in continuous operation. Using a centrifugal shot blasting system, smooth and profiled surfaces can be automatically deburred, descaled, or derusted. After treatment, the blasting media remains on the workpiece, which is guided through the blast chamber via the roller conveyor, and must be removed before it leaves the chamber.

[0003] This requires at least one brush unit mounted on a driven brush roller. The brush unit is subjected to high stress because the blasting media is abrasive and firm contact between the bristles and the workpiece surface is necessary to achieve the desired cleaning effect. Consequently, the bristles of the brush units wear down with increasing use, necessitating regular replacement. When changing the brushes, it must be considered that space within the blasting chamber is very limited and that further opening the blasting chamber, for example by removing cladding panels or other components, is not possible due to time and cost constraints. The technician must therefore crawl into the blasting chamber, which is contaminated with blasting media, remove the old brush units from the brush roller, and then install new ones.To allow for the removal and installation of the brush units without having to remove the entire brush roller, the brush elements are divided into at least two halves, which are screwed together and / or to the shaft. Under the described confined working conditions in a dusty environment, the technician must loosen the screws, which may also be seized due to ingress of abrasive material. To install a new brush unit, it is then necessary to place the two halves together, including the support shaft, and re-tighten the screws. Given the length and weight of a single brush unit, positioning, holding, and screwing it in place cannot be done by a single technician. Despite the already limited space, a second person is usually required.

[0004] A brush roller of this type is known from DE 102016112195 A1 and, in particular, from EP 3 266 343 A1, which discloses the preamble of claim 1.

[0005] In this embodiment, the brush roller is segmented into two brush units that can be mounted onto the support shaft from the outer circumference. They are secured by axially sliding the brush strip elements, which are equipped with a keder, into receptacles on the support shaft. Consequently, a large number of elements must be axially shifted for each assembly or disassembly. In a second embodiment, the segments are secured to the support shaft with axially sliding rods. Sufficient space must be available laterally next to the brush roller for these rods, so that in confined spaces, the brush roller may first have to be removed from the system.

[0006] A brush roller described in US 2019 / 03067309 A1 consists of two half-shells, each with a brush structure on its outer surface. The half-shells are not elastic. For assembly, two screws must first be fastened to attach T-nuts to the carrier shaft. Then, both half-shells must be slid onto the shaft so that their edge recesses engage with the T-nuts. Finally, two screws must be inserted from an internal cavity in the carrier shaft through holes so that they engage with the threaded holes in the half-shells. Therefore, access to a cavity in the carrier shaft is necessary, meaning the brush roller cannot be used on carrier shafts made of solid material or with a small-diameter cavity.The object of the present invention is to further facilitate the assembly and disassembly of a brush roller for a centrifugal blasting system and to enable this solely by accessing the brush roller from the outer circumference, i.e. without a necessary axial displacement of elements.

[0007] This problem is solved by a brush roller having the features of claim 1.

[0008] The invention is essentially based on a carrier ring segment that is specifically elastically deformable. Therefore, it can be positively fixed to the carrier shaft by pressing it on from the outside, with projections on the inside springing into corresponding recesses or grooves on the surface of the carrier shaft. For disassembly, the carrier ring segment is bent open again, so that the projections disengage from the recesses or grooves on the carrier shaft.

[0009] The bending of the support ring segments for disassembly is made possible by at least one push-off element in each of the two lateral legs of the semicircular support ring segment and a simultaneous cross-sectional weakening in the middle.

[0010] To produce a sufficiently deformable carrier ring segment, it is advantageous to manufacture it from polyamide and to reduce the radial expansion in a central area by approximately 20% to 30%. At the same time, the clear width between the inwardly facing projections should be approximately 0.90 to 0.95 times the diameter of the carrier shaft at the point where the projections engage in the recess or receiving groove provided there.

[0011] To secure the carrier ring segment, which is already positively locked to the carrier shaft after being pressed on, without play, at least one clamping element can be provided that acts between the carrier ring segment and the carrier shaft. This could, for example, be a screw guided radially through the carrier ring segment. The clamping element presses the projections of the carrier ring segment against the edges of the receiving groove.

[0012] Preferably, two identical carrier ring segments are provided, each extending over 180° and forming a closed carrier ring as a pair. If the projections are located at the ends of each segment, adjacent projections of both carrier ring segments can engage in a common recess or receiving groove on the carrier shaft.

[0013] However, two mounting points or grooves can also be provided for each carrier ring segment on the carrier shaft.

[0014] It is also possible that one of the support ring segments extends over less than 180° and the other over more than 180°. Furthermore, it is possible that both support ring segments cover less than a semicircle. Finally, the support ring can also be divided into more than two support ring segments.

[0015] In all the aforementioned variants that do not use a pair of identical carrier ring segments, it is only necessary that the projections allow for a sufficient positive fit in the recesses or grooves on the carrier shaft. For this to be possible, two recesses or receiving grooves on the carrier shaft must be opposite each other. This does not mean that they necessarily have to be diametrically opposed. However, a sufficient distance is required to ensure a secure positive engagement of the projections in the recesses or receiving grooves and, if necessary, additional clamping of the carrier ring segments against the carrier shaft.

[0016] For further axial securing, at least one end ring can be provided on the carrier shaft, which is attached next to a brush unit comprising two carrier ring segments and a plurality of brush ring elements connecting them.

[0017] The brush units essentially form a half-shell, so that two brush units combine to form a closed, cylindrical brush body, which then comprises at least two pairs of support ring segments.

[0018] Alternatively, the carrier ring segments can also be inserted into or removed from the receiving grooves from an axial end of the carrier shaft, if the installation situation allows.

[0019] Further advantageous embodiments of the invention are explained in more detail below with reference to the exemplary embodiment shown in the drawings. The figures show in detail: Fig. 1 a brush roller in perspective view; Fig. 2 a support ring segment in front view; Fig. 3 a brush roller during assembly in front view; Fig. 4 an enlarged detail from Figure 3 ; Fig. 5 the assembled brush roller in section; and Fig. 6 a carrier shaft with several brush rollers side by side.

[0020] In Figure 1 An exemplary embodiment of a brush roller 100 manufactured according to the invention is shown in perspective. It essentially consists of the following parts: a carrier shaft 40 with two axial receiving grooves 41; a pair of carrier ring segments 10 and a plurality of brush strip elements 20

[0021] The carrier shaft 40 has two receiving grooves 41 in its main axial region, which are provided on diametrically opposite sides of the outer circumference. In the end region, shoulders for the drive and bearings are also provided.

[0022] A single, semicircular support ring segment 10 is in Figure 2The carrier ring segment 10 is shown in a front view. It is preferably made of a thermoplastic material such as polyamide to ensure sufficient elasticity. This elasticity is important to enable both the positive locking of the carrier ring segment onto the shaft, as well as its subsequent removal, in conjunction with the shaping described below. The outer circumference of the carrier ring segment 10 has a multitude of undercut, keyhole-shaped recesses into which the brush strip elements can be inserted. At the inner circumference, a radially inwardly extending projection 12 is formed at each end, i.e., at the 3 o'clock and 9 o'clock positions. A recess 13 is provided in a central area, at the 12 o'clock position, to deliberately weaken the cross-section at this point and thus increase the elastic deformability of the carrier ring segment 10 in this area.

[0023] Furthermore, three radial through-holes 14, 15 are provided, each with an internal thread. The through-hole 15 in the center accommodates a screw that forms the clamping element, which secures the carrier ring segment 10 to the carrier shaft without play. Between the position of the clamping screw and one of the projections 12, approximately at the position of the angle bisector, another through-hole 14 is arranged for a pressure-reducing element.

[0024] In Figure 3 A brush roller 100 is shown from the front, in which a pair of axially spaced support ring segments 10 with brush strip elements 20 inserted therein are already attached to the underside of the support shaft 40. A second unit in the form of another pair of axially spaced support ring segments 10 with brush strip elements 20 inserted therein is placed onto the support shaft 40 from above.

[0025] How, in particular, the expansion of the center in Figure 4 As shown, the clear width between the projections 12 is smaller than the horizontally measured distance between the respective limiting edges of the receiving grooves 41, which can be approximated as the shaft diameter at this point. This means that the support ring segments 10 cannot simply be placed on top, but must be spread apart by elastic deformation so that the projections 12 reach the level of the receiving grooves 41 and can compress there. After compression, the support ring segments 10 are already positively locked to the support shaft 40.

[0026] In the lower support ring segment 10, a clamping screw 32, guided through the through-hole 15, is clamped against the outer surface of the support shaft 40, thereby pressing the projections 12 against the respective lower limiting edges of the receiving grooves 41. This secures the lower support ring segment 10 to the support shaft 40 without play. Puller screws 31 are already inserted into the through-holes 14 in the support ring segment 10 to facilitate later disassembly, but are currently inactive.

[0027] Once the clamping screw 32 of the upper carrier ring segment 10 is also clamped against the outer shell of the carrier shaft 40, the brush roller 100 is fully assembled. Figure 5 The fully assembled brush roller 100 is shown in cross-section.

[0028] To replace a carrier ring segment 10, the clamping screw 32 is first loosened to increase the deformability of the carrier ring segment 10. Then, the extraction screws 31 on both sides are tightened against the carrier shaft 40, causing the two outer legs of the carrier ring segment 10 to move outwards, which in turn moves the projections radially out of the receiving groove 41. This deformation is facilitated by the targeted cross-sectional weakening at the recess 13 in the center. The clamping screw 32 can also be used for extraction during this phase. It is also possible to apply a lever tool to the notch 16 formed on the outer circumference in the parting plane to remove the carrier ring segment 10.

[0029] Figure 6Figure 1 shows a perspective view of parts of the brush roller 100 with two brush units side by side. For clarity, only one support ring formed from two support ring segments 10 with only two brush strip elements 20 is shown for each brush unit.

[0030] The brush strip elements 20 each have an internally shaped thickening or are connected to a separate keder element 21 and are radially fixed in the recesses 11 by means of this thickening. For axial fixing, if the clamping effect between the keder element 21 and the recess 11 is insufficient, a retaining ring 50 is attached to the carrier shaft 40 on both sides of the brush strip elements 20. In the illustrated embodiment, this retaining ring is also designed in two parts so that it can be attached and removed at any axial position. In order to fulfill its function as a locking element for the brush strip elements 20, the retaining rings 50 must extend radially at least to the level of the keder element 21.

Claims

1. A brush roller (100) for a centrifugal blasting installation, at least comprising a carrier shaft (40) and at least two arcuate carrier ring segments (10) to be arranged thereon spaced apart from one another, having on their circumference a plurality of outward opening recesses (11) into each of which at least one brush strip element (20) is insertable, characterized in that - the carrier shaft (40) is, in each of at least two locations on Its circumference opposite to one another, provided with at least one recess and / or one axially extending receiving groove (41); - the carrier ring segments (10) are, each on their inner circumference in both of their end regions, provided with at least one protrusion (12) engaging with the recess or the receiving groove (41); - the carrier ring segments (10) are, by adjusting the elasticity of the material and the cross section, deformable such that the protrusions (12) are disengageable from the recess or the receiving groove (41) for dismantling, and - at least one push element (31) supported on the carrier shaft (40) and guided in a through bore (14) is provided, by means of which the carrier ring segment (10) is deformable and the protrusions (12) are disengageable from the recess or receiving groove (41).

2. The brush roller (100) according to claim 1, characterized in that two carrier ring segments (10) are provided which are formed as semi-circular arcuate segments and complement each other to form a closed carrier ring.

3. The brush roller (100) according to claim 1 or 2, characterized in that at least one tensioning element (32) is arranged on the carrier ring segments (10), each in a central region between the protrusions (12), with which the carrier ring segment (10) is tensionable against the carrier shaft (40)4. The brush roller (100) according to claim 3, characterized in that the tensioning element (32) is formed by a screw that is guided in a through bore (15) extending through the carrier ring segment (10).

5. The brush roller (100) according to any one of the preceding claims, characterized in that the push element (31) is formed by a screw that is guided in a through bore (14) extending through the carrier ring segments (10).

6. The brush roller (100) according to any one of the preceding claims, characterized in that the through bores (14, 15) are radially aligned.

7. The brush roller (100) according to claim 5 or 6, characterized in that the through bore (15) for the tensioning element (32) is arranged centrally between the protrusions (12) and the through bore (14) for the push element (31) is arranged in the region of the angle bisector between the through bore (15) for the tensioning element (32) and the protrusions (12), respectively.

8. The brush roller (100) according to one of claims 5 to 7, characterized in that the cross section of the carrier ring segment (10) is reduced by at least one recess (13) on the inner circumference below the through bore (15) for the tensioning element (32).

9. The brush roller (100) according to claim 8, characterized in that the radial extension of the carrier ring segment (10) in the region of the recess (13) is reduced by 20 % to 30 % compared to the radial extension of the lateral legs of the carrier ring segment (10) next to the recess (13).

10. The brush roller (100) according to any one of the preceding claims, characterized in that the clear width between the protrusions (12) is 0.90 to 0.95 times the shaft diameter of the carrier shaft (40).

11. The brush roller (100) according to any one of the preceding claims, characterized in that a termination ring (50) is arranged on the carrier shaft (40) at at least one axial end of the brush strip elements (20).

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