WO1995008427A1

WO1995008427A1 - Device for removing burrs and nubs on rubber tires

Info

Publication number: WO1995008427A1
Application number: PCT/DE1994/001101
Authority: WO
Inventors: Dietmar Wacker
Original assignee: Dietmar Wacker
Priority date: 1993-09-23
Filing date: 1994-09-16
Publication date: 1995-03-30

Abstract

To reduce the cycle time without impairing quality in the deburring of rubber tires (1) that have been embrittled through cooling, a deburring tool is proposed in the form of a concave roller mechanism that is or can be adjusted to the tread and sidewall of the tire (1) and that preferably can be driven in the same direction of rotation as the tire.

Description

Device for separating burrs and knobs on rubber tires

The invention relates to a device for separating burrs and knobs embrittled by cooling on gui tires by means of a separating tool which can be placed on the rotating tires.

Such a device is known for example from DE-OS-31 50 901.

In this device, the burrs or knobs on the running side or the side flanks of a rubber tire caused by production technology are removed in that the tire rotates in a cooling bath consisting of liquid nitrogen and the knobs which are embrittled in this way are removed by a deburring tool , for example a pneumatically guided roller or a scraper, can be removed.

In this device, however, as is stated, for example, in DE-OS 40 01 213, there is the disadvantage that each point of the row must be overstricked several times for satisfactory processing. This results in a considerable processing time that cannot be undercut, which according to DE-OS 31 50 901 is approximately 10 seconds.

These comparatively long processing times lead to embrittlement not only of the knobs or burrs to be removed, but also embrittlement of the tire in the tread pattern, since the tire is at least partially immersed in the liquid nitrogen bath during the processing time. This can result, among other things, in qualitative problems such that, due to the different coefficients of thermal expansion of rubber and the steel belt vulcanized into the rubber, separation phenomena between the two the materials that can lead to problems, particularly in the case of high-speed tires.

In order to eliminate the disadvantages described, it is proposed in the already cited DE-OS 40 01 213 to use a ribbed, non-rigid band consisting of a wire mesh instead of the known breaking tools, which with adaptation to the respective tire profile with the tread of the Tire or its side flanks is brought into contact. The use of a wire mesh improves the break-off effect due to the areal action and thus shortens the cycle times, but it is disadvantageous that the wire mesh can get caught on embrittled profile edges and the tire tread may be damaged in this way under certain circumstances.

Such deburring devices have therefore so far not been able to establish themselves in practice.

The invention has for its object to provide a deburring device for rubber tires, in which an extremely gentle treatment of the tire surface is ensured with short tick marks.

This object is achieved in that the cutting tool is designed as a concave roller body which is adapted or adaptable to the tread or side flanks of the tire and which can preferably be driven in the same direction as the direction of rotation of the tire.

The mode of operation of the device according to the invention is based on the surprising finding that the embrittled protruding knobs or burrs can be completely removed in a single tire revolution if there is a relative movement between the rotating tire tread and the rotating roller body circumference. In principle, this relative speed can also run in opposite directions driven roller bodies are reached, but preferably the roller bodies are driven in the same direction, ie with the same direction of rotation, so that the drive energy for the roller bodies can be kept low and the tangential components of the respective circumferential movement point in the opposite direction.

The problem-free breaking behavior of the embrittled knobs at a sufficiently high relative speed between the roller body and the tread of the tire is evidently based on a dynamic strength behavior which has not been ascertained so far and which allows the knobs to break off flatly directly at the boundary between the knob body and the tire surface. With the device according to the invention, all the knobs and burrs can be completely removed when the tire is rotated once.

The cycle times achievable with the device according to the invention are approximately 1-1.5 seconds. In addition to reduced coolant consumption, this also has the advantage that the tire, which is usually partially immersed in the coolant, is only exposed to the cold for a very short time, so that the studs only become brittle and there is no deterioration in quality. The fact that only the knobs, but not the tire tread, embrittles it, at the same time reliably precludes the possibility that damage to the tire tread can be caused by the roller body, which rotates preferably in the same manner.

In order to further improve the breaking effect of the concave roller body surface, a profiling of the roller body can also be advantageous for this reason, the profiles either as beads or grooves running in the longitudinal direction of the roller body or as both longitudinally and also Beads or grooves extending circumferentially can be formed. In order to avoid impermissibly high pressure or frictional forces on the tread or side flanks of the tire, the roller bodies are preferably resiliently or resiliently mounted in the radial direction of the tire. In this way, the roller bodies move back in the radial direction if, for example, the tire to be treated is not clamped in the center of its rotation device or if a tire with an excessively large diameter is erroneously deburred.

The problem, previously felt to be disadvantageous, of having to use new break-off bodies to be installed for tires of different sizes or profiles, can be solved by providing different roll bodies, each adapted to the tire size, which are mounted on a preferably automatic roll body changing device ¬ are ordered.

The roller body changing device is preferably designed as a multi-arm, rotatable holding tester which can be swiveled towards the tire, on the holding arms of which the differently shaped roller bodies are arranged such that they can be driven. In this way, the appropriate roll intended for processing can be brought into the correct processing position by rotating the holding star.

Such a roller body changing device can be arranged on both sides of a tire, so that if, for example, three different roller bodies are seated on the holding star, a total of six processing rollers are available.

Such a number of different roller bodies is usually sufficient in the usual production lines for car tires. However, holding stars with a higher number of Ηalt arms can also be used if required. Another possibility according to the invention for adapting the roller body to different tire profiles or tire sizes is to design the concave rollers as two-part bodies that can be displaced or telescoped in the longitudinal axis of the roller. The two partial roller bodies are expediently in the direction of the roller axis under spring tension, z. B. with the help of two compression springs, so that they can be set automatically by the tire to the correct length. Due to the force of the compression springs, the side legs of the roller tread attach to the side flanks of the tire at the same time. The springs can rotate with the rollers or act on corresponding sliding or bearing surfaces.

For better machining of the tire flanks, the roller axes can also be arranged at an angle to a plane of symmetry that intersects the tire axis perpendicularly. Two rollers can be engaged with the tire surface, for example the roller running to the right of the tire axis can be rotated clockwise with its axis with respect to the above plane of symmetry and the roller running to the left can be rotated counterclockwise. The profile of the contact surfaces of the rollers can be asymmetrical and correspond to the corresponding tire flank.

Liquid nitrogen which is filled into a trough and which is expediently thermally insulated against cold losses is preferably used as the coolant in the device according to the invention. The tire to be deburred, which only has to be immersed in the coolant in the area of its tread, is clamped in a centering or holding device which, for. B. is pivotable and driven to rotate the tire. In this way, the tire can be automatically grasped, centered, immersed in the bath and lifted out of the bath by a feed path, the deburring process preferably taking place during the immersion of the tread of the tire in the coolant bath. In order to achieve a further increase in the production speed, the tires can also be supplied with the aid of several centering or holding devices which, for. B. are movable in a triangular frame. A first holding device takes a tire from the feed path and centers it, a second dips a tire while rotating into the coolant bath and a third transfers a deburring tire to the downstream parts of the production line. The third holding device in the frame then moves back to take over a new tire.

Since the tires deburred in the manner described now have a geometry that is completely uniform in terms of their diameter, without annoying knobs or protrusions, the device according to the invention can be combined with an optical tire measurement system for detecting imbalances without any problems, so that this usually takes place after removal ¬ burring control process can take place immediately during or shortly after deburring in the same treatment step.

The invention is illustrated in the drawing, for example, and is explained in detail below with reference to the drawing. Show it

FIG. 1 shows a schematic side view of a deburring device according to the invention,

FIG. 2 shows a side view or a section through a profiled roller body,

FIG. 3 shows a schematic side view of a deburring device with three holding or centering devices which run in a triangular frame, FIG. 4 shows a roller which can be telescoped in the direction of the longitudinal axis of the roller and which adjusts itself automatically to the tire size, and

FIG. 5 shows two rollers with their roller longitudinal axes arranged at an angle to the tire axis with an asymmetrical tire profile.

In the deburring device shown in FIG. 1, a car tire 1 is clamped in a pivotable holding device 2 and, by actuating a drive member 3, is transported into a thermally insulated trough 4 in which liquid nitrogen 5 is located. The holding device 2 consists in particular of conically shaped centering jaws 6 which engage in the inner tire opening 7 and center and hold the car tire 1 when moving together.

The tire 1, which is centered and clamped in this way and partially immersed in the nitrogen bath 5, can be set in rotation by a motor 8.

On both sides of the car tire 1 immersed in the nitrogen bath 5 there are roller bodies 9 with a concave surface, as shown in FIG.

The roller bodies 9 are seated on rotatable holding stars 10, which are also pivotable and can move the respectively matching roller bodies 9 to the running surface of the car tire 1. The roller bodies 9 can be driven in the same direction as the direction of rotation of the automobile tire 1 by drive means (not shown).

By turning the holding stars 10 with the holding arms 11, the appropriate roller bodies 9 can be pivoted toward the car tire 1 for deburring them. In the bottom area of the tub 4, a conveyor 12 is provided, the z. B. consists of a broken, endlessly revolving conveyor belt 13. The broken nubs and burrs can be removed from the nitrogen bath 5 with the aid of the conveyor belt 13.

In the constellation shown in FIG. 1, the roller body 9 is in engagement with the tire 1 on the right-hand side of the image, the tire 1 and the roller body 9 having the same direction of rotation, as a result of which the tangential direction of movement of the surfaces is opposite. The situation is correspondingly reversed when the left holding star 10 is used.

In the view or sectional drawing shown in FIG. 2, the inwardly curved or concave surface contour of the roller body 9 can be seen. On the surface of the roller body 9, grooves 14 are formed as a profile, which can be curved or rectilinear, as can be seen directly from the drawing figures. The formation of the groove edges can also differ according to the sectional views.

With the grooves 14, the broken knobs, for example, can also be thrown directly out of the machining area with the corresponding direction of rotation, so that they no longer fall into the nitrogen bath 5 or the tub 4.

FIG. 3 shows a deburring device with three holding or centering devices 15, 16, 17, which can be moved in a triangular frame 18 in the longitudinal direction of the legs 19. In the position shown, the holding device 15 has taken over a tire 1 from a conveyor track, not shown. It then moves down into the position of the holding device 16, where the tire 1 is deburred while rotating. Then the shark 17 into the position from where the tire 1 leaves the deburring device. The holding device on the upper leg 19 then moves to the right again in order to take over a new tire.

FIG. 4 schematically shows the construction of a two-part deburring roller 20 which can be telescoped in the direction of its longitudinal axis. The pressure springs 21, 22 center the roller body on the axis 23 and simultaneously press the roller flanks 24, 25 against the tire flanks 26, 27.

FIG. 5 shows two deburring rollers 28, 29, the axes of which are arranged at an angle to the tire axis. Both rollers 28, 29 are simultaneously in engagement with the tire surface, the left roller 28 belonging to the left holding star 10 and the right roller 29 belonging to the holding star 10 according to FIG. 1 or 3, for example. Due to their special tread pattern 30, the rollers 28, 29 can also deburr tire flanks that are comparatively strongly curved.

Reference list

1 car tire 2 holding device

3 drive organ

4 tub

5 nitrogen bath

6 centering jaw 7 tire opening

8 engine

9 reel body

10 holding stars

11 holding arm 12 conveyor

13 conveyor belt

14 groove

15, 16, 17 holding device 18 frame 19 legs

20 deburring roller 21, 22 compression spring

23 axis

24, 25 roller flank 26, 27 tire flank

28, 29 deburring roller 30 profile formation

Claims

claims

1. Device for separating ridges and nubs on rubber tires, which are embrittled by cooling, by means of a separating tool that can be attached to the rotating tire, characterized in that the separating tool is designed as a concave roller body adapted or adaptable to the tread or side flanks of the tire (1) (9, 20, 28, 29) is formed, which can preferably be driven in the same direction as the direction of rotation of the tire (1).

2. Device according to claim 1, so that the outer surface of the roller body (9, 20, 28, 29) touching the tire (1) is profiled.

3. Device according to claim 2, so that the profiles are designed as beads or grooves (14) which extend at least also in the longitudinal direction of the roller body (9, 20, 28, 29).

4. Device according to one of claims 1-3, d a ¬ d u r c h g e k e n n z e i c h n e t that the roller body (9, 20, 28, 29) is resiliently or resiliently mounted in the radial direction of the tire.

5. Device according to one of claims 1-4, since ¬ characterized in that several, on a reel body changing device (10) angeord¬ nete, adapted to different tire sizes or profiles or adaptable reel body (9, 20, 28, 29) are provided.

6. The device according to claim 5, dadurchge ¬ indicates that the reel body changing device is designed as a swiveling towards the tire (1), multi-armed, rotatable holding star (10), on the holding arms (11) of the reel body (9, 20, 28, 29) are arranged to be drivable.

7. Apparatus according to claim 5 or 6, so that a roller body (9, 20, 28, 29) or a roller body changing device (10) are provided on both sides for the tire (1).

8. Device according to one of claims 1 - 7, so that the roller body is designed as a two-part, telescopic body (20) which can be moved relative to one another in the direction of the roller axis.

9. The device according to claim 8, so that the partial sub-bodies which are displaceable in the axial direction of the roller are axially spring-loaded in the axial direction.

10. Device according to one of claims 1-9, d a - d u r c h g e k e n n e e c h n e t that the roller axis is arranged at an angle to the tire axis.

11. The device according to claim 10, d a d u r c h g e ¬ k e n n z e i c h n e t that the roller profile 30 is asymmetrical.

12. Device according to one of claims 1-11, since ¬ characterized in that the tire (1) in a pivotable, rotatably drivable centering or holding device (2) is arranged, the tire (1) from a feed path automatically grasped, centered, immersed in the bath and out of the bath- lifts, the deburring process taking place during immersion in the coolant bath (5).

13. Device according to one of claims 1-11, d a - d u r c h g e k e n n e e c h n e t that several, in a frame (18) movable holding or centering devices (15, 16, 17) are provided.

14. The apparatus of claim 13, d a d u r c h g e - k e n n z e i c h n e t that the frame (18) as

Triangle with three holding devices (15, 16, 17) is formed.

15. Device according to one of claims 1-14, - characterized in that liquid nitrogen (5) filled into a trough (4) is used as coolant, in which bath (5) the tire (1) to be deburred is used immersed at least with its tread.

16. The device according to any one of claims 1-15, that it can be combined with a tire measurement system for the detection of unbalances.