APPARATUS FOR MACHINING THE CIRCUMFERENTIAL SURFACE OF A CYLINDRICAL OBJECT

Abstract: An apparatus (11) for scraping off of a cylindrical part (10) comprises a rotor (cleaning means 15) and a stator (holder means 12). The rotor (15) is equipped with power-driven arrangements (16a), which cooperate with power-driving arrangements (P) on the stator (12), for turning of the cleaning means (15) relative to the stator (12). The rotor (15) is formed by two rotor parts (15a, 15b), which are joined together into a rigid, annular rotor. The rotor (15) is free-flowingly rotatably mounted directly in the holder means (12) and is equipped with a set of support rollers (49) and a set of scraper means (50) which are controlled by centrifugal force during rotation of the rotor.

Description: Apparatus for machining the circumferential surface of a cylindrical object. The present invention relates to an apparatus for cleaning the peripheral surface on a cylindrical part, especially a pipe portion, which forms a part of a pipe conduit, where the apparatus comprises a rotor in the form of a rotating cleaning means having associated cleaning tools and a stator member in the form of a holder means, and where the cleaning means is equipped with cleaning tools for cleaning of the peripheral surface on the cylindrical part and with power-driven arrangements, which cooperate with equivalent power-driving arrangements on the holder member, for turning the cleaning means relative to the holder means, where the cleaning means is formed by two or more members separated in the peripheral direction and where the members are adapted to be joined together into a rigid, annular cleaning means. With the present invention the aim is to provide a cleaning apparatus which is particularly designed for cleaning, that is to say scraping off or like removal of rust, paint or other deposits from the peripheral surface on a cylindrical or substantially cylindrical part. The cylindrical part is shown herein in the form of a recti¬ linear pipe member, which can form a part of a pipe con¬ duit or a pipe conduit arrangement, hand rail of pipe members or the like. The apparatus can also be employed in bent or curved conduit paths. Alternatively the apparatus can be employed on arbitrary objects having substantially cylindrical peripheral portions. Apparatuses of the afore-mentioned kind are known from U.S Patents 2,299,523, 2,635,270, 2,657,409, 2,715,235, 4,124,914 and 5,001,801, which all have a holder member which is supported directly against the cylindrical part by means of support wheels mounted in the holder member. Drive means are employed which have rela¬ tively great weight and great rigidity and which compli¬ cate to a substantial degree the design of the apparatus and make it cumbersome in use. Hitherto it has been a problem to achieve a simple and effective operation of the rotor together with a simple and rapid fixing of a cleaning apparatus in engage¬ ment with the object which is to be cleaned, especially in such cases where it is desirable to clean a pipe member in a pipe conduit or similar cylindrical member in a larger construction, where the apparatus is readily able to be mounted and dismounted with a simple grip by manual handling. With the present invention the aim is to provide a cleaning apparatus which has a simple and effective con- struction and which has a relatively small weight and thereby is easy to handle in use. 'The apparatus according to the invention is charac¬ terised in that the holder means is supported in the cylindrical part via the rotor, the rotor being rotatably mounted directly in the holder means, while the rotor is free floatingly mounted on the cylindrical part, that the rotor is supplied with rotational force in a guide between the rotor and the holder means, that the rotor is supported against the cylindrical part by means of a set of support rollers, which is movable towards and away from the cylindrical part with a centrifugal force for cen¬ tering the rotor relative to the cylindrical part depending upon the rotational speed, and the rotor is equipped with a set of scraper means, which is movable to- wards and away from the cylindrical part with a centri¬ fugal force. According to the invention an apparatus is provided which can be subjected regulatably to a cleaning effect by subjecting the associated scraper means to a regulatable tension force based on a regulatable centrifugal force in connection with regulating the rotational speed of the rotor which carries the scraper means. According to the invention the possibility exists of effecting ready movement of the apparatus in the longi¬ tudinal direction of the cylindrical part as a consequence of the floating mounting of the apparatus on the cylindrical part. In this connection an effective cen¬ tering of the apparatus can be ensured relative to the cylindrical part and an effective scraping effect with equivalent centering of the scraper means. In connection with said centering one can according to the invention mount if necessary support wheels and associated scraper means about one and the same pivotal axis and/or actuate these jointly by means of a common weight means. It is also possible to control the centering movements of each and all of the support rollers with a common annular control means, so that the support rollers are moved jointly towards and away from the cylindrical part. Further features of the present invention will be evident from the following description having regard to the accompanying drawings, wherein: Fig. 1 shows the apparatus according to the inven¬ tion ready for use for the cleaning of a cylindrical pipe member. Fig. 2 shows in perspective two rotor parts, which form a part of the apparatus according to Fig. 1, illu¬ strated separately. Fig. 3 and 4 show the two rotor parts in two successive mounting steps. Fig. 5 shows the apparatus in part viewed substan- tially parallel to the plane of rotation of the rotor. Fig. 6 shows a cross-section through the one rotor part and its one support wheel and scraper means mechanism. Fig. 7 shows a longitudinal section through the rotor and the associated, four support wheel and scraper means mechanisms illustrated. Fig. 8 shows on a larger scale a support wheel and scraper mechanism according to Fig. 7. Fig. 9 shows in cross-section an apparatus according to the invention, designed for relatively thin pipes, for example pipes of hand rails and the like. In Fig. 1 a cylindrical part 10 is shown, which is to be cleaned of rust, oxide scale, paint or like depo¬ sits, by means of an apparatus 11 according to the inven¬ tion. The cylindrical part 10 is shown herein in the form of a rectilinear pipe member, which forms a part of a pipe conduit or a pipe conduit arrangement. The apparatus can also be employed in bent or curved conduit paths. Alterna¬ tively the apparatus can be employed on arbitrary objects having essentially cylindrical peripheral portions. In the illustrated embodiment turbine operation is employed, that is to say pneumatic operation based on a current of compressed air, shown by the arrow P, from a compressed air nozzle (not shown further) , but alterna¬ tively electrical, hydraulic or other power-driven drive means (not shown further) can be employed. It is evident from Fig. 1 that the pneumatically driven apparatus 11 consists of a holder means 12 having associated compressed air conduit 13, which with a nozzle opening discharges internally into a housing ^art 14 in the holder means. Housing part 14 of the holder means 12 engages and locally surrounds a cleaning means 15 in the form of a rigid annular member, which forms a rotor, while the holder means 12 in the form of a simple light weight construction forms a stator in the apparatus 11. Just by the housing part 14 the compressed air conduit 13 is in the form of a rigid hand grip portion 13a. In the con¬ struction illustrated the apparatus 11 is floatingly mounted on the part 10, so that it can be moved unhindered longitudinally along the part 10 and can be swung un¬ hindered about the periphery of the part 10. In practice the apparatus can be manually retained in established positions or manually moved sideways along the part 10. Alternatively the apparatus 11 can be fastened in a power- driven control apparatus (not shown further) and be moved in an automatically controlled manner along the pipe member 10. From Fig. 2 it is evident that the annular cleaning means 15 consists of two separate rotor parts 15a,15b, which can be clamped in rigid annular form about the pipe member 10, as is indicated in the mounting phases, as illustrated in Fig. 3 and 4, and in the finally mounted condition, as is illustrated in Fig. 1. Each rotor part is constructed of an outer, rigid rim portion 16 and two disc-shaped side pieces 17,18 which define between them an arcuate hollow space or groove 19. The rim portion 16 is provided on its radially outermost peripheral side with a series of recesses 16a which in their proper turn thrust tightly up to the nozzle mouth internally in housing part 14 of the holder means 12. It is possible to regulate the drive speed on the rotor 15 by regulating the force of compressed air. This can be effected by means of a control handle not shown further on the apparatus or in another suitable manner. In the one rotor part 15a a hook-carrying first fastening member 20 is fastened in the bottom of the groove 19, at the one end of the rotor part. Associated hook portion 20a of the fastening member 20 is adapted, in the mounting phase as is shown in Fig. 3, to be hooked into engagement with a bar-shaped second fastening member 21, which is fastened at the opposing end of the other rotor part 15b./ In the mounting phase as is illustrated in Fig. 4, the second fastening member 21 is adapted together with the first fastening member 20 to form at the one end of the rotor parts a hinge-forming fastening between the members. The rotor parts 15a,15b are equipped at their other end, opposite the fastening members 20,21, with a snap lock 22 for intermittent locking together of said other ends of the rotor parts. The rotor part 15b is provided with a locking head 23, in which a pair of oppositely directed bolt members 24,25 are displaceably mounted. By means of an intermediate compression spring (not shown further) the bolt members 24,25 are tensioned with a spring force in a direction from each other. The rotor part 15a is provided equivalently in the opposite side pieces 17,18 with locking grooves in the form of bores 26,27. On swinging together the rotor parts 15a,15b to a closed annular form the bolt members 24,25 are snapped into locking engagement in associated bores 26,27. The locking engagement can be correspondingly removed by pressing in the bolt members 24,25 from opposite sides of the rotor 12. From Fig. 3-5 it is evident that the housing part is equipped with a set of radially inner support wheels 28,29 and a set of radially outer support wheels 30,31, which are rolled off against flange surfaces on one respectively of two opposite flanges 32,33 on respectively opposite sides of rim portion 16 of the rotor 15. In Fig. 5 a pair of radially inner support wheels 28,29 are shown at the one end of the housing part 14, which are mounted on their respective separate pivots 34, 35, and a pair of radially outer support wheels 30,31, which are mounted on a common pivot 36. As indicated with pivots 34 and 36 respectively in Fig. 3 and 4 there are arranged a pair of radially inner support wheels and a pair of radially outer support wheels respectively at each end of the housing part 14. The housing part can be guided endwise into place on a rim portion 16 of the rotor part 15a, in an easy way before the rotor parts 15a,15b are snapped together in the posi¬ tion which is illustrated in Fig. 1. As is illustrated in Fig. 6-8, an arrangement of four support rollers or centering mechanisms 37-40 is arranged internally in groove 19 of the rotor 15, which in the illustrated embodiment are combined with an equivalent four cleaning or scraper mechanisms 41-44. The mechanisms 37-40, 41-44 are adapted during operation respectively to centre the rotor 15 relative to the pipe member 10 and to adjust the scraping effect according to need. The actions of these mechanisms can be regulated by equivalent regula¬ tion of the supply of compressed air and thereby regula- tion of the rotational speed of the rotor. The greater the rotational speed is, the greater the abutment force obtained between the scraper means and the cylindrical part. Correspondingly the greater the rotational speed is, the greater the abutment force or the centering force obtained between the support rollers and the cylindrical part. Provision is made for placing the scraper means axially outermost in the apparatus at opposite ends of the apparatus, so that the support rollers lying axially within can be supported against processed surfaces on the cylindrical part, independently of the direction in which the apparatus is moved longitudinally along the apparatus. In Fig. 8 a first two branch lever 45 is shown, which is tiltable about an axle pin 46 mounted between the side pieces 17,18 and a second two branch lever 47, which is tiltable about an axle pin 48 which passes through the outer end of one, short branch 45a of the first lever 45. The other, longest branch 45b of the first lever 45 has . a greater weight than its short branch 45a, which carries a support roller 49, which is rotatably mounted on the axle pin 48, in order to ensure thereby a desirably large swinging moment to press the support roller 49 against the pipe member 10. This applies especially in connection with the centrifugal force which acts against the mechanism during rotation of the rotor. Correspondingly provision is made for a desirably large swinging moment in the longest branch 47b of the second lever 47 in that the longest branch has a greater weight than the short branch 47a, which at the outer end carries a cleaning tool in the form of a scraper means 50, in order thereby to press with a swinging moment the scraper means 50 with a suitable elastic force against the pipe member 10. As is shown in Fig. 6 two parallel levers 47 are employed in each scraper mechanism (41-44) each with its respective scraper means 50. In practice a common scraper means can alternatively be employed which spans over the whole breadth of each lever 47 and also the intermediate space between these. The choice is made to limit the tilting movement of the first lever 45 by means of guide means 51,52. In this connection a guide pin 51 extends from the lever 45 laterally inwards into a guide groove 52 in the guide rail 53 which is a common guide rail for all the four levers 45 illustrated. The guide rail 53 is divided into two guide rail portions which are joint connected each with its rotor part by means of joint connections not shown further, so that the guide rail portions which can thrust endwise tightly together into a coherent annular member, are moved in the rotational movement together with the associated rotor part, but with a certain extra swinging movement relative to the rotor member. In practice the levers 45, guided by respective guide means 51 and 52 together with guide rail 53, will be moved outwardly and inwardly relative to the cylindrical part precisely in step with each other by actuation of four separate centri¬ fugal weights. Correspondingly the choice is made to limit the tilting movement of the second lever 47 and this is ensured by allowing the longest lever branch 47b to form a support abutment against the axle pin 46. Instead of the illustrated mounting of the lever 47 about the rotary pin 48 it is possible to mount the lever 47 about the axle pin 46. In such a case there can be arranged for example opposite stop means (not shown further) on the lever 45 in order to ensure swinging about of the lever 47 in step with the lever 45, but with a certain possibility for swinging movement relative to the lever 47. Alternatively the lever 47 can in the end, which faces opposite the scraper means 50, be provided with a weight portion corresponding to the weight portion 45b of the lever 45. In Fig. 9 a hand tool 60 is shown, which is particu¬ larly designed for use in the cleaning of the peripheral surface on a cylindrical part, for example on a pipe- shaped section in a hand rail or the like. A handle 61 is shown having an internal mouthpiece (not shown further) which communicates with an associated air feed pipe 62. For example the mouthpiece is fashioned in and discharges into a first clamp member 63 rigidly connected to the handle 61. A second clamp member 64 is shown, which is pivotally mounted on the handle 61 about an axle pin 65 together with a handle 66. In Fig. 9 the pivotable clamp member 64 is shown in the use position by full drawn lines and by broken lines in the inactive condition, in readi- ness for guiding on the cylindrical part which is to be processed. The clamp members 63 and 64 are adapted to receive between them a rotor 67. The rotor 67 is rotated by means of compressed air which is supplied from the mouthpiece 62, in a corresponding manner as the rotor 15 in the embodiment of Fig. 1-8. The clamp members 63 and 64 are equipped at the outer end with their respective support roller 63a and 64a for thrusting against the rotor 67, while a third support roller 61a for thrusting against the rotor 67 is rotatably mounted on the handle 61 in connection with the pin 65. A material difference relative to the embodiment according to Fig. 1-8 is that the apparatus according to fig. 9 supports the rotor at three points which are dis¬ placed at an angle of 120° relative to each other. Another difference is that a carrying arm 68 is mounted for a scraper means 69, a pipe-support wheel 70 and associated counterweight 71 directly in the rotor 67. In addition fastening means 72 of the scraper means 69 and pivot 73 of the wheel 70 are connected to one and the same carrying arm.

Claims: Patent Claims 1. Apparatus (11) for the cleaning of the peripheral surface on a cylindrical part (10) , especially a pipe portion which forms a part of a pipe conduit, where the apparatus (11,60) comprises a rotor (15,67) in the form of a rotating cleaning means and a stator (12,63-65) in the form of a holder means, and where the cleaning means (15,67) is equipped with a cleaning tool (50,69) for cleaning the peripheral surface on the cylindrical part (10) and equipped with power-driven arrangements (16a) , which cooperate with equivalent power-driving arrangements (P) on the holder means (12,63-65), for turning the cleaning means (15,67) relative to the holder means (12,63-65), where the cleaning means (15,67) is formed by two or more parts separated in the peripheral direction and where the parts are adapted to be joined together into a rigid, annular cleaning means, characterised in that the holder means (12,63-65) is supported in the cylindrical part (10) via the cleaning tool in the form of a rotor (15,67), the rotor being turnably mounted directly in the holder means (12,63-65), while the rotor (15,67) is free- flowingly mounted on the cylindrical part (10) , that the rotor (15,67) is supplied with rotational force in a guide between the rotor (15,67) and the holder means (12, 63- 65), that the rotor (15,67) is supported against the cylindrical part (10) by means of a set of support rollers (49) , which are movable towards and away from the cylindrical part (10) with a centrifugal force, for centering the rotor relative to the cylindrical part (10) depending upon the speed of rotation, and that the rotor (15,67) is equipped with a set of scraper means (50,69), which are movable towards and away from the cylindrical part (10) with a centrifugal force. 2. Apparatus in accordance with claim 1, characterised in that the rotor (15) is provided with flanges (32,33) oppositely directed in an axial direction which with their flange surfaces form roller paths for a set of support wheels (28-31) or like roller means fastened to the holder means (12) on opposite sides of the flanges (32,33) . 3. Apparatus in accordance with claim 1 or 2, characterised in that on a radially outer peripheral surface (at 16) the rotor (15) is equipped with power- driven arrangements (16a) , which cooperate with an equivalent power-driving arrangement (P) , which is located in the holder means (12) radially just outside the outer peripheral surface of the rotor (15) . 4. Apparatus in accordance with claim 3, characterised in that power-driven arrangements of the rotor (15) consist of a rim (16) of local recesses (16a) in the outer peripheral surface of the rotor (15) , and that the power-driving arrangement of the holder means consists of a compressed air nozzle with associated compressed air current (P) , the compressed air nozzle preferably being connected to a regulatable source of compressed air. 5. Apparatus in accordance with claim 1, characterised in that the rotor parts (15a,15b) are separately formed by an outer rigid annular member and from this side pieces (17,18) projecting radially inwards, which between them define a hollow space or groove (19) for the reception of the set of support rollers (49) and the set of scraper means (50) , and that the set of support rollers (49) and the set of the scraper means (50) are adapted to be swung inwardly towards the cylindrical part (10) by means of their respective connected carrying means (45,47), which are actuated by centrifugal force produced by means of the rotation of the rotor (15) . 6. Apparatus in accordance with claim 5, characterised in that each support roller (49) is rotatably mounted in a first short branch (45a) of a two branch lever (45) , which is pivotable about a pivot (46) , which is fastened between the side pieces (17,18), the second, longest branch (45b) of the lever (45) having the greatest weight and mass. 7. Apparatus in accordance with claim 6, characterised in that the second branch (45b) is provided with a guide pin (51) which cooperates with a guide groove (52) in a common guide rail (53) for the levers (45) fastened to the holder means (12) and which allows a limited swinging angle for the lever (45) relative to the pivot (46) , the guide rail (53) providing for a controlled movement of the levers (45) relative to each other. 8. Apparatus in accordance with one of the claims 5- 7, characterised in that each scraper means (50) is fastened at the end of the one short branch (47a) of a two branch, second lever (47) , which is pivotally mounted about an axle pin (48) concentrically with and/or is constituted by the axle pin of a cooperating support roller (49) in the first-mentioned lever (45) , the other, longest branch (47b) of the second lever (47) having the greatest weight and mass. 9. Apparatus in accordance with claim 8, characterised in that pivot (46) of the first lever (45) forms a stop for the longest branch (47b) of the second lever (47) . 10. Apparatus in accordance with one of the claims 1- 9, characterised in that at its one end the one rotor part (15a) is provided with a hook-shaped fastening portion (20a) , that the second rotor part (15b) at an adjacent end is provided with a pivot bearing-forming anchoring means (21) for swinging about of the rotor parts (15a,15b) relative to each other, and that the rotor parts (15a, 15b) are provided at the opposite end with a snap-forming, manually releasable locking means (24,25/26,27), with which the rotor parts (15a, 15b) can be locked together in the form of a rigid, annular rotor (15) .

Inventors: DALSEIDE BJOERN OVE, DALSEIDE, BJOERN, OVE
Applicants: DALSEIDE & CO, DALSEIDE BJOERN OVE, DALSEIDE & CO., DALSEIDE, BJOERN, OVE
Application year: 1995
Main classification: B08B9
IPC codes: B08B9