DE1778615A1 - Tire vulcanizing press with heating bellows - Google Patents

Description

Tire vulcanizing press with heating bellows

The invention relates to a tire vulcanizing press for vulcanizing large preformed green tires, in particular tires to be retreaded for trucks with a bladder which is inserted into an annular space is retractable between two telescoping cylinders with double folding, the outer of these two cylinders being one Beaded sitar ring and the inner cylinder (bellows guide cylinder) serves to guide the bellows.

When vulcanizing heavy tires, such as tires for trucks or tractors, the introduction and removal of the green tire must or of the tire to be retreaded provided with a raw tread, since such tires have a considerable have weight. It must therefore be at a low loading height be respected. Most tire curing presses have loading devices for larger tires. It is for them too it is desirable that they are as low as possible above the lower half of the shape can be retracted. In the case of tire curing presses, a small opening stroke is also desirable, namely once by Keep the overall height of the press as low as possible and, on the other hand,

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ren to the drive mechanism for raising and lowering the upper To be able to run the press part as small and cheap as possible.

The invention is based on the object of a press of the initially named genus in compliance with the lowest possible construction height and as small a necessary opening stroke as possible in such a way that that the loading height is as low as possible. A special drive for the bellows introduction should be avoided.

This object is achieved according to the invention in that the bladder is arranged in the lower part of the press and the outer cylinder (ejection cylinder) has a drive device and as an ejector for the fully vulcanized tire from the lower JTorm half serves and that a locking device is provided which the bellows guide cylinder, with the lower end of the 3aigkiemmringe are firmly connected, holds in an upper position in which the Bellows guide cylinder when lifting the ejector cylinder due to the frictional forces transmitted by the bellows between the ejector cylinder and Bellows guide cylinder was taken.

In such a press, the ejection cylinder, which is necessary in presses for heavy tires, is to pull the tire out of the lower half of the jam to be able to break out, at the same time made usable as a drive for bringing the bellows into the working position. The bladder is also held in the working position by the locking device according to the invention when the ejection cylinder

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who will back up, τη the vulcanizing blank into the lower J? orinliäifte. 3ei the tire vulcanizing press according to the invention becomes aj-so, without increasing the overall height, a special one 38.1 -, drive avoided. The opening stroke "only needs to be so large that the tire can still comfortably fit between the mold halves can be introduced, v / o in the case of even the small amount of a possible loading device is to be charged. The order The 3aiges in the lower part of the press allows the hole for the inflow and outflow of the heating water at the deepest stiffener of the bellows. This has the advantage that when the tire is emptied, the steam generated above the water level is the water pushes out of the tire, which leads to very short emptying times.

Kit the 13aig cylinder can be connected to a downwardly extending rod be that can be locked on the Pressenunterteix, for example by means of a locking bolt passing through a transverse hole in the rod. This locking bolt can be hydraulic or pneumatic or can be actuated electromagnetically and then engages when the ejection cylinder passes through the bellows guide cylinder including the bellows soffit has taken so far that the transverse bore of the rod protruding below is at the level of the locking bolt. During the subsequent downward movement of the ejection cylinder, the bellows guide cylinder can no longer be taken along and the bellows enters the hollow of the tire.

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In an advantageous embodiment of the invention, the dj.e are bead clamping rings to one tight to the lower end of the BaigführungZylinder connected package combined, the individual rings of which lie pressure-tight against one another. This training of the Baigkiein leadership leads to that the pressure of the heating water or steam with which the Baxg is filled when the press is completely closed during heating cannot affect an entire circular area, but only on a ring surface, which is inside through the clamping bars ™ the rim of the bellows is limited. The ones acting on the JOrm halves Forces that try to push the moldings apart become thus around 12 to 1i? $ reduced compared to such presses, at - which the pressure can affect almost to the baig axis.

The press is preferably provided with a feed device with tire support, said tire support is in a known manner at such a height that the Ausstoßzyiin- k stands in its fully raised position the tire from the tire support. This task can be carried out by the tire ejection cylinder without prejudice to its additional task of "bringing the bladder into the working position.

In order to be able to retract the loading device as close as possible to the lower mold half, the upper edges of the bellows guide cylinder and the cold point of the bellows are in the position in which the bellows guide cylinder and the bellows are deepest in the ejection cylinder.

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are introduced linearly, preferably at the same level or lower a ± s the lower Wuj-Stsitsring at the upper edge of the ejection cylinder. With dimensions of this kind, an ejection cylinder is shown at ab ge lowers no part over the upper edge of the lower part of the press, so that the .jeschiclcungsvorrichtung close to the lower part of the press can retract.

According to a further development of the invention, the bottom of the discharge point is located at least one upwardly projecting stop rod is connected, the end face of which is connected to the end face of a further stop rod cooperates, the exnes on the cover axially movable cylinder carrying the upper bead seat ring at its lower edge is attached protruding downwards, the lengths of the two Anselilagstangen are coordinated so that the lower and upper V / uistsitzring are kept at a distance, preferably slightly kxeiner is the final spacing of the sore seats

closed press. In this way it is easy to reach that the tire beads are not inadmissibly approached each other, so that a sufficiently large mouth width for the introduction of the Bladder remains in the tire cavity. Still can the bead seats are brought so close together that the upper bead seat even then the upper tire bead is detected when the beads of the blank approach each other due to the storage in a stack to have. This is important because the upper bead seat ring directs the bladder into the tire cavity.

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The drive device displacing the upper bead seat ring ■ (upper drive device), preferably a Druckmit'telzyiinder can be made stronger than the device actuating the ejection cylinder (lower drive device), so that the upper drive device can move the ejection cylinder against the force of the lower drive device over the stop rods. Man can be easily combined with the existing drive for the upper bead seat ring the green tire into the lower half of the mold Move while maintaining the WuIstring distance.

An exemplary embodiment of the invention is shown schematically in the drawing shown. Show it:

1 shows a vertical section through an open tire vulcanizing press, with a tire to be vulcanized retreaded between the Pormhalften is,

I "ig. 2 a state in which the tire from the support of the loading device is lifted,

Pig. 3 shows a state in which the upper part of the press has moved down so far that the stop rods are already located touched and the ejector cylinder was pushed down a little,

4 shows the state with the press already largely closed, with the bladder is largely inserted into the tire to the largest rope and

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5 shows the state with the press completely closed and un1a? Pressurized bladder.

In the schematic representation, the press lower part 1 and press upper part are shown 2 together with the facilities located on them are starlc simplified dargestej.it.

The lower part of the press has a table 5 on which the lower Porm half 4 is placed with its heating plate 5 via an insulating intermediate layer M 6. On the table 3 there are downwardly projecting walls 7 which carry a floor 8 at the bottom. At the bottom 8 Druckmitteizyiinder 9a and 9b are provided for raising and lowering the device described below.

The base 11 of an ejection cylinder 12 is firmly connected to the piston rods 10a, 10b assigned to the cylinders 9a and 9'b (compare S ^{1 Ig. 2).} The ejection cylinder 12 carries the lower Wuistsitzring 13 on its upper edge. Relative to the ejection cylinder 12, the guide cylinder 14 is displaceable. This belay guide cylinder rests indirectly on a plate 15 via the? 3aig clamping rings 16, 17.

The heating bellows 18 has edge reinforcements 19 in a manner known per se and 20. The edge reinforcement 19 is clamped between the lower edge 21 of the Baxgführungszylinders 14 and the bellows clamping ring 16, while the other edge reinforcement 20 between the bellows clamping ring 1.6 and the lower bellows clamping ring 17 is clamped. The bellows guide

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zylinäer 21 mitt.Lere K, the lower clamp ring 16 lemm ring 17, the plate 15 are pressed against each other tightly by non-illustrated clamping screws. The bellows 18 is folded twice (fold position 22) and lies in the annular space 23 which is located between the inner surface of the ejection cylinder 12 and the outer surface of the bellows guide cylinder 14. This annular space 23 is in relation to the dimensions of the bellows so that the bellows must be forced into this annular space so that it presses itself very strongly against the outer surface of the bellows guide cylinder 14 as well as against the inner surface of the ejection cylinder 12.

On the plate 15 of the Baigführungszyiinders is a downwardly protruding Rod 24 attached centrally. This rod extends through a guide bush 25 in the bottom 8. The rod 14 has a collar 26 at the bottom and a transverse bore 27 a little above this collar. In the bottom 8 is a The locking bolt 28 shown only in cross section (in FIGS. 2 to 5) is supported and fits into the transverse hole 27 of the rod 24.

w In order to supply the heating means is a line 29, which via the middle Balgklemmring 16 in the I-Ieizbalginnere opens.

At the bottom 11 of the ejection cylinder 12 are two stop rods 30a and 30b are provided, the upper end faces 31a and 31b of which act as stops in a manner to be described below. In the fully retracted Position of the bellows, which is shown in Fig. 1, the upper edge 32 of the Baigführungszyiinders 14 is slightly lower than the

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upper edge of the lower Wuistsitariiiges 13.

The upper press part 2 has to be a .Befestigungsplatte 33, the lifting device not shown in the drawing by means of a strong to "v / corner of the opening and the press Schiießens gehooen and lowered. .At the bottom of this plate 33 is the lOrmenoberteii with its 34- The heating plate 35 is attached via a heat-insulating intermediate layer 36, a cylindrical upwardly projecting extension y / is attached in the Pxatte 33. This extension 37 is closed by a bottom 33.

At the .Boden 38 a Druckmitteisyiinder 39 is attached, the effective cross section of which is greater than the sum of the effective cross sections of the lower pressure cylinder 9a and 9b. The bottom 41 of a cylinder 42 is firmly connected to the piston rod 40 of the pressure medium cylinder 39. The cylinder 42 carries on its lower edge the upper bead seat ring 43. This bead seat ring has a Kegeif lache 44, which serves in a manner to be described as a Pührungsfläche for ä the bellows when it penetrates into the tire cavity.

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At the .Qoden 41 of the 3 cylinder 42 ± s = fe are two rods protruding downwards 48a and 48b attached, which are coaxial with the rods 30a and 30b and their lower end faces 49a and 49b as stop surfaces to serve.

In. "Fig. 1 is still the support 45 of a disconnection device for the tire 46 is shown. The movement mechanism for this

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Edition is not shown and i: ann in any known manner and V / be executed.

The function of the press according to the invention is based on the following all figures discussed, with each figure having a different phase of movement shows.

Fig. 1 shows the state when the press is fully open, in which the press upper part 2 is raised as far as possible. Of the The upper bead seat ring 43 is pulled completely against the upper mold half 34. Likewise, the lower bead seat ring 13 ^ is down to the lower mold half 4 used. A tire to be retreaded 46 to be vulcanized is with the feeder 45 between the two mold halves have been retracted. The Baxg 18 is permanent from ± y disappeared in the annulus 23. The guide cylinder has disappeared into the ejection cylinder 12 as far as possible.

Starting from this position, the cylinders 9a, 9b are under pressure set, whereby the ejector cylinder 12 is raised, una so far until the bead seat ring 13 has grasped the lower tire bead 47 and the tire slightly above the loader pad 45 has raised (Fig. 2). The loading device is now extended, which is possible because it is known per se Way is open on one side and there has a passage that is slightly larger than the outer diameter of the lower bead seat ring 13th

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During the upward movement of the ejection cylinder 12, the guide cylinder 14 together with the Baxg 18 was taken up with it, namely by virtue of the friction that the Baxg transmits from the ejection cylinder 12 to the bellows guide cylinder 14. Eventually it was the Rod 24 », which is firmly connected to plate 15, goes so far pulled up until the collar 26 has come to rest on the underside of the sod 8. At this moment the locking pin will be 23 (see FIG. 2) is automatically inserted into the transverse bore 27.

During the closing process, in which the upper part of the press 2 is lowered, at the same time the upper Wuistsitzring 45 is also moved downwards relative to the upper part of the press by the application of pressure to the hydraulic cylinder 59. The press upper part 2 can initially move downward until the end faces 51a, 31b, 49a, 49b of the rods 30a, 5Üb and 4tfa, 4üb touch. The Wuist seat rings 43 and 13 then have a distance from one another which is slightly smaller than the final distance that is taken up during vulcanization. It is thus achieved that the upper bead 50 of a tire is also ^{detected when this has approached the lower V. T} uist 47 beyond the nominal dimension.

When the press is closed further, the lower wuxst seat ring 13 and the upper bead seat ring 43 while maintaining their spacing moves downward, the ejection cylinder 12 on which the lower bead seat ring 13 is attached, relative to the lower mold half 4 shifts until the lower bead seat ring 13 and the tire 46 have come to rest on the lower mold half 4. While

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this closing movement remains the bellows guide cylinder 14 together with the firmly connected to it clamping rings of the bellows stationary relative to the Press frame, so that the bellows finally, on the sail surface 44 with his cold junction 22 and at the same time, like from Pig. 3 can be seen, is passed into the tire cavity 51. When the bladder is largely inserted into the tire cavity 51 (FIG. 4), some pressure is introduced into the bellows via the pressure medium supply line 29, so that it rests against the inner wall 52 of the tire.

The fully closed position is in Pig. 5 to see. Pig. shows that by virtue of the arrangement of the bellows in the lower part of the press Inlet opening 53 of the pressure medium line 29 lies at a low point of the bellows. From Pig. 5 it can be seen that with completely closed press between the stop surfaces of the rods 48a, 48b and 30a, 30b a small space 54 is created. this means that the bead seat rings have been removed from one another somewhat, whereby they have assumed their final position.

) After the heating period has ended, the press is switched on by lifting the upper part of the press opened, with the Pormobteil including the upper bead Loosen the seat ring from the top of the tire. The bellows initially remains in the tire. ! Is done by applying pressure to the cylinder 9a, 9b of the ejection cylinder 12 is raised, the tire 46 being broken out of the lower Pormhhalf 4. From the consideration of Pig. 5 it is clear that the bellows is pulled out of the tire cavity during this lifting of the tire, since the bellows clamping rings are still are stationary. At the same time, the bellows is in the annulus

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drawn in between the ejection cylinder and the suction cylinder.

The ejection cylinder 12 is raised until the bellows guide cylinder and the bellows have completely disappeared in the ejection cylinder 12, so that their relative position is as in Fig. 1. In this
In position, the tire is already raised to a height that allows the loading device 45 to be driven underneath. After the tire has been driven under by this loading device, is
the bolt 28 is automatically pulled out and the cylinders 9a, 9b move the ejection cylinder together with the bellows guide cylinder 14, which passes through
from the bellows 18 transmitted friction is taken down until
the ejection cylinder finally the in fig. 1 has taken the position shown, after which a new loading of the press can take place, which proceeds as described above.

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Claims (7)

Claims; 1.J tire vulcanizing press for vulcanizing large preformed Green tires, in particular tires to be retreaded for trucks with a heating bellows, which can be retracted in an annular space between two telescoping cylinders with double folds is, the outer of these two cylinders carries a bead seat ring and the inner cylinder (bellows guide cylinder) for the bellows guide ^ serves, characterized in that the bladder (18) in the press lower part (1) is arranged and the outer cylinder (12) (ejection cylinder) a drive device (9a, 9b) and as an ejector for the finished vulcanized tire (46) from the lower half of the standard (4) is used and that a locking device (27, 28) is provided, which the bellows guide cylinder (14), with the lower edge of the Bellows clamping rings (21, 16, 17) are firmly connected, in an upper Holds the position in which the bellows guide cylinder (14) is held when it is lifted of the ejection cylinder (20) by the frictional forces transmitted by the bellows (18) between ejection cylinder (12) and bellows guide cylinder "(14) was taken. 2. Tire vulcanizing press according to claim 1, characterized in that that a downwardly projecting rod (24) is connected to the bellows guide cylinder (14) and can be locked on the lower part of the press, for example in the middle of a locking bolt (28) passing through a transverse bore (27) of the rod (24). -15- 209813/0511 BATH ORIGINAL 3. Tire curing press according to one or both of the preceding Claims, characterized in that the Wuist clamping rings (21, 16, 17) are firmly attached to the lower base of the bellows guide cylinder (14) connected package are combined, the individual rings of which are pressure-tight against one another. 4. Tire vulcanizing press according to one or more of the preceding Claims, characterized in that the press in a known manner has a loading device with a tire ^ j auf.La ^ e (45) and that the ejection cylinder (12) in its voxj. lifted position the tire (46) from the tire support (45) takes off. 5 .. Tire vulcanizing press according to one or more of the preceding Claims, characterized in that the upper edge (32) of the bellows guide cylinder and the gap parts (22) of the bellows (18) in the position in which the bellows guide cylinder (14) and bellows (18) are inserted deepest into the ejection cylinder (12), the same Height or lower than the lower bead seat ring (13) located on the upper edge of the ejection cylinder (12). 6. Tire vulcanizing press according to one or more of the preceding Claims, characterized in that with the bottom (11) of the ejection cylinder (14) at least one stop rod projecting upwards (30a, 30b) is connected, the end face (31a, 31b) of which with the -16- 209813/0511 End face (49a, 49b) of at least one further attachment point (48a, 48b) cooperates on the cover (41) of an axially movable, at its lower edge, the cylinder (42) carrying the upper bead seat ring (43) is attached so as to protrude downwards, the lengths of the two stop rods (30a, 30b, 48a, 48b) are coordinated so that the lower (13) and upper bead seat ring (43) in be kept a distance, which is preferably slightly smaller than the final distance between the Wuist seat rings (13, 43) when fully closed Press. 7. tire vulcanizing press according to claim 6, characterized in that that the drive device (39) (upper drive device) which moves the upper bead seat ring (43), preferably a pressure medium cylinder, is stronger than the device (9a, 9b) actuating the ejection cylinder (12) (lower drive device), see above that the upper drive device (39) counter to the ejection cylinder (12) the force of the lower drive device (9a, 9b) via the stop rods (48a, 48b, 30a, 30b). 209813/0511 BATH ORIGINAL