DE102008021805B4 - Cutting and chamfering device for pipes - Google Patents

Abstract

Cutting and chamfering device (100) for pipes (200, 200 '), comprising a base frame (10) with at least one pipe receiving unit (30, 40) into which a pipe (200, 200') is to be laid, and with a separating cutter unit (10). 20), - which is mounted on an arm (21) connected to the base frame (10), wherein the arm with the separating cutter unit (20) can be lowered onto the tube receiving unit (30), - the at least one arm (21) directly or via the Trennschneidereinheit (20) connected to the stop element (25) which is designed as a rotatably mounted stop roller (25), characterized in that - the Trennschneidereinheit (20) is designed as an electric hand tool angle grinder on the arm (21) is clamped, - that the separating cutter unit (20) at least one transverse to the longitudinal axis of the tube receiving unit (30, 40) aligned rotatably mounted cutting and milling disc (22), wherein the cutting and milling disc (22) at least e a cutting area (23) and a frusto-conical milling area (24) with a cone angle α of 20 ° -90 °, wherein the stop element (25) next to the milling area (24) is arranged and - that the base frame (10) by two existed arranged and via at least one cross member (13, 14) connected bearing elements (11, 12) is formed, on each of which a tube receiving unit (30, 40) is arranged, wherein at least one bearing element (11) of the arm (21) with the separating cutter unit (20) is pivotally mounted.

Description

The invention relates to a cutting and chamfering device for pipes according to the preamble of patent claim 1.

Pipes, especially PVC plastic pipes, usually have a spigot and a socket end. If the pipe has to be shortened or a short pipe section with double-sided spigots is made, it is difficult under construction site conditions to make a straight cut perpendicular to the pipe longitudinal axis and then deburr the end to obtain a tapered surface which prevents the spigot from being inserted allowed in a sleeve. If the separating cut and / or bevelling is carried out uncleanly, the seal inserted in the pipe socket will later be damaged during insertion. In addition, there is a significant risk of injury when the tube is freehand cut and chamfered with an angle grinder.

In the DE 10 99 488 C a device is described, which is intended for pipes with large wall thickness for later welding. Here, cutting and milling operations are performed sequentially. The milling does not serve the post-processing of the cutting edge, but it should be made in advance a V-shaped groove, and then subsequently the section through the cutting cutter, which is centered in the groove, only to allow.

In the DE 93 06 249 U1 a hand-held milling tool for deburring of workpiece edges is disclosed. A particular suitability for the processing of pipes is just as little specified as for the simultaneous cutting and deburring.

The DE 34 07 854 A1 shows a stationary unit. With this unit pipes can be chamfered, but only in the production plant of the pipe manufacturer, but not under site conditions, since the unit is not mobile usable.

The US 4,362,187 A again shows a heavy and only stationary to use device, which is also designed for the particular application of the corrugated pipes. Although a combined separating and chamfering disc is disclosed, however, it can not be seen that limiting the immersion depth would be adjustable by simple means.

A generic cutting and chamfering device shows and describes the De 196 03 361 C2 , It is a combined pipe cutting and pipe chamfering device suitable for a thin-walled pipe and which rests on a hand-held tool in the manner of an angle grinder. Also, a depth regulation for the Zustelltiefe whose compliance is required for the creation of a precisely trained chamfer is provided. For this purpose, an eccentric delivery and a complicated trained angle scale is provided. In addition, different jaws are provided for different pipe diameters. Under site conditions, however, it is unlikely that the appropriate jaws for the pipe diameter are clean and protected ready and that before a cutting process with each diameter change on the pipe end to be machined before the jaws are replaced. The object of the invention is therefore to provide a cutting and chamfering device for pipes, with the safe processing is possible and which also easy to handle and transport.

This object is achieved by a cutting and chamfering device with the features according to claim 1.

Due to the firm support of the tube in the tube receiving unit a lateral slipping of the tube is prevented.

Essential to the invention is the equipment of Trennschneidereinheit with a combined cutting and milling disc, which also includes a cutting disc or a saw blade for cutting through the tube wall and a directly subsequent milling cone and in particular provided in accordance with the invention stop member which intercepts the Trennschneidereinheit on the tube shell, as soon as Cutting section has cut through the pipe jacket and the milling area has produced the conical surface with the desired length.

Preferably, the stop element is designed as a rotatably mounted stop roller to prevent chafing on the tube shell and to facilitate the rotation of the tube.

The storage of the cutting unit on a movable arm relieves the operator who no longer needs to guide the cutting unit itself. This alone can penetrate through the pipe jacket due to its own weight with the cutting area and then mills the spigot until the stop roller rests on the adjacent peripheral region of the pipe jacket and prevents further radial plunging movement of the cutting unit. The operator only needs to let the pipe guided in the pipe receiving unit rotate about its longitudinal axis in order to carry out the severing of the pipe wall together with the production of the conical surface over the entire circumference.

If the pipe section has already been brought to the desired length, the device according to the invention can also be used only for subsequent milling of the chamfer, by pushing the pipe end to be machined laterally in front of the cutting disk and then lowering the separating cutter unit. This then places itself with its milling area outside of the pipe end and carries material from the pipe wall until the stop roller in turn rests on the pipe shell and prevents further immersion.

A particular advantage of the invention is that the basic function described can be formed by very simple frames and with the aid of commercially available modules. Thus, the cutting unit can be formed by a commercial angle grinder. By installing a commercially available power tool, an easy replacement is possible, so that the work readiness is restored at any time.

It is also possible, as a separator unit to arrange only the rotatably mounted cutting and milling disc on the movable arm and provide the drive stationary on the frame. The power transmission then takes place via belts or via a flexible shaft.

The pipe receiving unit may be formed by sliding shells. The advantage here is that even very short pieces of pipe are securely guided. A sliding cup must be easily replaceable attached to the base frame to use depending on the diameter of the pipe to be machined a suitable sliding shell can.

For universal use with different pipe diameters, it is advantageous to form the pipe receiving unit by at least two adjacent rollers, wherein the rollers are preferably aligned with their axes of rotation parallel to the longitudinal axis of the tube. If one looks at two spaced pipe receiving units, each with a pair of rollers, under certain circumstances, very long pipes can be processed. An adjustability of the distance of the bearing units is advantageous, in turn, to create the possibility to edit even shorter pieces of pipe.

Preferably, each storage unit has at least two pairs of rollers. A lower pair of rollers is installed with a small distance of the rollers to each other. A second pair of rollers is arranged in a vertical plane above it and with a considerably greater distance between the rollers.

• – Rohre mit kleinem Durchmesser liegen auf dem untersten Rollenpaar auf und können darauf liegend bearbeitet und rotiert werden. Zu den oberhalb gelegenen Rollenpaaren besteht entweder gar kein Kontakt oder eine zusätzliche seitliche Führung bei einem bestimmten Rohrdurchmesser.
• – Noch größere Rohre liegen dann allein auf dem oberen Rollenpaar auf und kontaktieren die unteren Rollen nicht mehr.

This cascade-shaped arrangement can be supplemented by further pairs of rolls, depending on the diameter spectrum of the pipes to be processed:

• - Small diameter pipes are located on the bottom pair of rollers and can be processed lying on it and rotated. To the above pair of rollers there is either no contact or an additional lateral guidance at a certain pipe diameter.
• - Even larger pipes are then alone on the upper pair of rollers and contact the lower rollers no longer.

If the rollers are arranged on swivel-mounted brackets, it is possible for at least two rollers to rest on the outer jacket of the tube from each side, regardless of the tube diameter. The arcuate bow pieces are pivotally connected to the base frame and / or with each other. Their joint is at the bottom and is pulled down by an applied pipe. By a suitable guide on the bearing units of the arc-shaped brackets nestle in such a tong-like, upwardly open arrangement, the bracket with the rollers to the pipe jacket. It is thus created an automatic width adjustment in the pipe receiving.

The bearing units to which the rollers are attached are preferably formed as a stamped sheet metal part. To increase the flexural rigidity, at least the lower end is folded as a foot angle.

The foot angle can be provided with recesses through which feet can be pushed through. These are screwed above the foot angle with the storage units, so that the entire base frame can be used standing on feet, which is particularly suitable for stationary use in operations, while the use of the device according to the invention in the field direct placement of the frame on the earth's surface is advantageous ,

It is also possible to provide a motorized friction-wheel drive, which engages the tube jacket and rotates the tube uniformly, so that the user's activity can be reduced to monitoring.

The invention will be explained in more detail with reference to the drawings. The figures show in detail:

1 a cutting and Anfasvorrichtung in a schematic view from the front;

2 a cutting cutter unit with a pipe in section;

3 a cutting and Anfasvorrichtung in a schematic plan view and

4 a cutting and Anfasvorrichtung in a schematic side view.

1 shows a cutting and chamfering device according to the invention 100 from the front, ie in the direction of the longitudinal axis of a pipe placed thereon 200 seen.

At a storage unit 11 are roles 31 . 32 arranged in pairs, each one a roll holder 30 form. Indicated are with dotted lines two tubes 200 . 200 ' with different diameters. While a pipe 200 with small diameter on the lower rollers 31 rests, lies a tube 200 ' with larger diameter on the upper rollers 32 on.

About an arm 21 is a separator unit 20 with the storage unit 11 or the base frame 10 pivotally connected. The cutting unit 20 may be in the direction of the curved arrow on the pipes 200 . 200 ' be lowered. A spring indicated only schematically 26 serves as a return device and for safe holding of the cutting unit 20 in the illustrated upper position, namely behind a dead center, which must first be overcome, so in the range of the pipe receiving unit 30 can be worked safely.

2 shows one on the tube recordings 30 stored pipe 200 , The cutting unit 20 already has a cutting area 23 their cutting and milling disc 22 a cut 202 introduced into the pipe wall.

By rotating the tube 200 around its central axis is the cut 202 completes and a pipe section 203 separated, leaving the pipe 200 has the desired preset length.

A milling area 24 the cutting and milling disc 22 lies on the pipe jacket and forms a frustoconical inclined surface 201 at the finished pipe 200 allows easy insertion into a pipe socket.

The simultaneous cutting and milling is due to a stop roller 25 possible with an adjustable holder 26 with the arm 21 or directly with the cutter unit 20 connected is. The stop role 25 lies after reaching the desired length of the inclined surface 201 on the pipe jacket and prevents too much penetration of the milling area 24 in the tube jacket.

By the stop roller 25 the user only needs the pipe 200 to turn around its central axis. He needs the Trennschneidereinheit 20 not necessarily to lead.

He can but the Trennschneidereinheit 20 first lead by hand and only lower so far that the separating cut 202 is performed. Then he leaves the Trennschneidereinheit 20 descend until the stop roller 25 rests and rotates the tube 200 once again, to the beveled surface 201 to form precisely.

3 shows the cutting and chamfering device 100 in a view from above, to the arrangement of the pipe shots 30 . 40 display. The cutting unit 20 however, is shown greatly simplified, including the stop roller 25 not drawn here.

The base frame 10 consists of two parallel storage units 11 . 12 that have trusses 13 . 14 are connected.

The roles 31 . 32 from left tube receiving unit 30 are fixed but rotatable on the bearing unit 11 assembled. The traverse 14 is below the for a pipe 200 intended position. The right tube receiving unit is slidable on the crossbar 14 guided and can be fixed on toggle bolts, socket pins or the like. A stop element 16 can be adjusted in advance to the length of a piece of pipe to be cut 203 to specify precisely.

To guide the rear end of a pipe 200 is a supplementary pipe receiving unit 40 provided that about similar pairs of roles 41 . 42 as with the tube receiving units 30 features. An adjustment rod 43 is in the traverse 14 guided, so that the distance of the additional pipe receiving unit 40 to the front pipe receiving units 30 is adjustable or the additional pipe receiving unit 40 completely out of the base frame 10 can be removed. Even a remote use outside the base frame is possible for very long pipes.

4 shows the cutting and chamfering device 100 from the side, where especially the height offset of the lower and upper pairs of rollers 31 . 32 becomes clear. foot angle 17 at the storage units 11 . 12 serve to improve the flexural rigidity as well as the support in the field. In addition, longer adjustable feet can be attached to form a table frame for stationary use.

Claims (13)

Cutting and chamfering device ( 100 ) for pipes ( 200 ; 200 ' ), with a base frame ( 10 ) with at least one pipe receiving unit ( 30 . 40 ) into which a pipe ( 200 ; 200 ' ), and with a separation cutter unit ( 20 ), - at one with the base frame ( 10 ) connected arm ( 21 ), wherein the arm with the cutting unit ( 20 ) to the pipe receiving unit ( 30 ) is lowerable, - the at least one with the arm ( 21 ) directly or via the separating cutter unit ( 20 ) connected stop element ( 25 ), which as a rotatably mounted stop roller ( 25 ), characterized in that - the separating cutter unit ( 20 ) is designed as an electric hand tool angle grinder on the arm ( 21 ), - that the separating cutter unit ( 20 ) at least one transverse to the longitudinal axis of the pipe receiving unit ( 30 . 40 ) aligned, rotatably mounted cutting and milling disc ( 22 ), wherein the cutting and milling disc ( 22 ) at least one cutting area ( 23 ) and a frusto-conical milling area ( 24 ) with a cone angle α of 20 ° -90 °, wherein the stop element ( 25 ) next to the milling area ( 24 ) and - that the base frame ( 10 ) by two passes to each other and at least one traverse ( 13 . 14 ) connected bearing elements ( 11 . 12 ) is formed, at each of which a pipe receiving unit ( 30 . 40 ) is arranged, wherein at least one bearing element ( 11 ) the arm ( 21 ) with the separating cutter unit ( 20 ) is pivotally mounted. Cutting and chamfering device ( 100 ) according to claim 1, characterized in that the cutting and milling disc ( 22 ) of one on the base frame ( 10 ) mounted drive unit is driven. Cutting and chamfering device ( 100 ) according to claim 1 or 2, characterized in that the pipe receiving unit ( 30 . 40 ) each by at least two transverse to the longitudinal axis aligned rollers ( 31 . 32 . 41 . 42 ) is formed. Cutting and chamfering device ( 100 ) according to claim 3, characterized in that the tube receiving units ( 30 . 40 ) each by at least two transverse to the longitudinal axis aligned pairs of rollers ( 31 . 32 . 41 . 42 ) are formed, wherein in each case a first pair of rollers ( 31 . 32 ) at the bottom of the base frame ( 10 ) and the second and each further pair are each aligned above and with a greater lateral distance to the longitudinal axis. Cutting and chamfering device according to claim 3 or 4, characterized in that the rollers are fixed to arcuate bracket pieces, which are pivotally connected to the base frame and / or with each other. Cutting and chamfering device according to claim 3 or 4, characterized in that the tube receiving unit is formed by at least one upwardly open sliding shell. Cutting and chamfering device ( 100 ) according to one of claims 1 to 6, characterized in that a traverse ( 14 ) is tubular and has a clamping and / or locking device and that an adjusting rod ( 43 ) a supplementary pipe receiving unit ( 40 ) in the traverse ( 14 ) can be inserted. Cutting and chamfering device ( 100 ) according to one of claims 1 to 7, characterized in that the storage units ( 11 . 12 ) each as one with a beveled foot angle ( 17 ) provided sheet metal blank are formed. Cutting and chamfering device ( 100 ) according to claim 8, characterized in that feet by recesses in the foot angle ( 17 ) and with the storage unit ( 11 . 12 ) are bolted. Cutting and chamfering device ( 100 ) according to one of claims 1 to 9, characterized in that the stop roller ( 25 ) on a bracket ( 26 ) which is pivotally mounted on the arm ( 21 ) and its angle to the arm ( 21 ) is adjustable via an adjusting unit. Cutting and chamfering device ( 100 ) according to one of the preceding claims, characterized in that the arm with the Trennschneidereinheit tool-free from the base frame is releasable. Cutting and chamfering device ( 100 ) according to one of the preceding claims, characterized in that the cutting and milling disc ( 22 ) on both sides of the cutting area ( 23 ) each have a frusto-conical milling area with a cone angle α of 20 ° -90 °. Cutting and chamfering device ( 100 ) according to one of the preceding claims, characterized by a rotation device with at least one friction wheel which can be pressed against a pipe.

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