CN112936940A

CN112936940A - Belt drum, tire building machine and tread assembly forming method

Info

Publication number: CN112936940A
Application number: CN202110347953.5A
Authority: CN
Inventors: 吴从高; 曹晓明; 曹跃
Original assignee: Safe Run Intelligent Equipment Co Ltd
Current assignee: Safe Run Intelligent Equipment Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-06-11
Also published as: WO2022206823A1

Abstract

The invention discloses a belt drum for forming a tread assembly, wherein the tread assembly comprises a belt layer and a tread layer, the belt drum can rotate to sequentially attach the belt layer and the tread layer, the width of the tread layer is greater than that of the belt layer, and the belt drum comprises: a drum shaft assembly including a drum shaft; the drum tile assembly is arranged on the radial outer side of the drum shaft and comprises a plurality of drum tiles, and the drum tiles can move radially relative to the drum shaft; the support unit is arranged on one of the plurality of drum tiles and comprises a plurality of groups of support blocks, each group of support blocks comprises two support blocks which are symmetrically arranged along the width central plane of the belt beam drum, and at least one group of support blocks which are positioned on the axial outer side of the belt beam layer and on the radial inner side of the tread layer can move to a lifting position and are used for supporting the parts of the two sides of the head-tail lap joint of the tread layer, which exceed the two sides of the belt beam layer. A high quality tread assembly can be obtained by means of the belt drum. The invention discloses a tire building machine with the belt drum and a tire tread assembly building method.

Description

Belt drum, tire building machine and tread assembly forming method

Technical Field

The invention relates to the technical field of tire molding, in particular to a belt drum, a tire molding machine and a tire tread assembly molding method.

Background

Tires are ground-rolling annular elastomeric rubber articles fitted on various vehicles, which are usually mounted on metal rims capable of supporting the vehicle body. Currently, tires available on the market are all formed by vulcanizing a tire blank by a vulcanizing machine. An automobile tire blank is generally composed of a tread component and a carcass component, wherein the tread component comprises a buffer layer (or called a belt layer), a cap ply and a tread layer, the tread is used for being in direct contact with a road surface, and the carcass component comprises an inner liner layer, a sidewall layer, a tire bead and a cord fabric layer.

The tire blank is formed by a tire forming machine, and the tire forming machine generally comprises a belt drum, a tread assembly conveying device, a forming drum, a tire body assembly conveying device, a transfer ring device and the like. Wherein, the belt drum is arranged close to one side of the tread conveying device, and the forming drum is arranged close to one side of the carcass assembly feeding device. When the tread assembly is formed, firstly, a tread assembly feeding device cuts belt ply materials at a fixed length and conveys the belt ply materials to the circumferential surface of a belt ply drum; then the tread assembly feeding device conveys the crown belt material to the circumferential outer surface of the belt layer of the belt drum; and finally, conveying the tread material cut at a fixed length to the circumferential outer surface of the crown belt material of the belt drum by using the tread component feeding device.

It should be noted that, because the width of the tire fabric is greater than that of the belt material and the crown strip material, when the overlapped parts of the head and the tail of the tire fabric need to be sewn or laminated, the tread material part beyond the belt material and the crown strip material has no way to obtain effective rolling sewing or laminating, resulting in poor joint quality of the tire fabric. In the prior art, the manual bonding is adopted, so that the automatic production of the tire blank is not facilitated.

Disclosure of Invention

The invention aims to provide a belt drum which can flexibly support parts of two sides of a head-tail overlapping part of a tread layer, which exceed two sides of the belt layer, according to the width of the belt layer and the width of the tread layer so as to be beneficial to the integral pressing of the head-tail overlapping part of the tread layer and obtain a high-quality tread assembly.

In order to achieve the purpose, the invention adopts the following technical scheme:

a belt drum for building a tread assembly comprising a belt layer and a tread layer, the belt drum being rotatable to apply belt and tread layers in sequence, the tread layer having a width greater than the width of the belt layer, the belt drum comprising:

a drum shaft assembly including a drum shaft located at a center position of the belt drum;

the drum tile assembly is arranged on the radial outer side of the drum shaft and comprises a plurality of drum tiles which are distributed along the circumferential direction, and the plurality of drum tiles can move relative to the drum shaft in the radial direction;

and a supporting unit is arranged on one of the plurality of drum tiles and comprises a plurality of groups of supporting blocks, each group of supporting blocks comprises two supporting blocks which are symmetrically arranged along the width central plane of the belt beam drum, and at least one group of supporting blocks which are positioned on the axial outer side of the belt beam layer and on the radial inner side of the tread layer can move to a lifting position and are used for supporting the parts of the two sides of the head-tail lap joint of the tread layer, which exceed the two sides of the belt beam layer.

Further, the drum shaft assembly further comprises fixing plates arranged on two sides of the drum shaft, a plurality of fixing rods for supporting and positioning the two fixing plates, and a moving member which is installed outside the drum shaft and can move for a certain distance along the axial direction of the drum shaft.

Further, the drum tile assembly further comprises a plurality of supports fixed on the radial inner sides of the plurality of drum tiles, the moving member is connected with the plurality of supports in a sliding mode in an inclined mode, and the two sides of the drum tile assembly are connected with the two sides of the drum shaft assembly in a sliding mode in a radial mode.

Furthermore, the supporting unit further comprises a piston and two connecting rods, the piston and the two connecting rods are fixedly connected to the lower portion of each supporting block, the two connecting rods are located on two sides of the piston, and the drum tile is provided with an accommodating cavity for accommodating the piston and an accommodating cavity for accommodating the connecting rods.

Further, still be equipped with in the holding drum tile with a plurality of air flues of acceping the chamber intercommunication, the support unit still resets including the elasticity that the cover was located the connecting rod outside and was acceptd in the holding intracavity.

Furthermore, the supporting unit further comprises an elastic reset piece which is sleeved outside the connecting rod and is contained in the containing cavity.

Further, the support blocks on the support unit covered by the band layer are locked to the drum tile, and the remaining support blocks on the support unit are radially movable.

Furthermore, a sensor used for sensing the belt layer is arranged in the supporting block on the supporting unit.

a belt drum for building a tread assembly comprising at least a belt layer and a tread layer, the belt drum being rotatable for applying the belt layer and the tread layer in sequence, the tread layer having a width greater than the width of the belt layer, the belt drum comprising:

be provided with first supporting unit and second supporting unit on one of a plurality of tiles, first supporting unit includes a plurality of first supporting blocks along axial extension, the second supporting unit includes a plurality of second supporting blocks along axial extension, a plurality of first supporting blocks or a plurality of second supporting block are followed belted and are bloated width central plane symmetry setting, are located belted layer axial outside reaches the first supporting block or the second supporting block of at least two symmetries of tread layer radial inside can move to the lifting position for support tread layer head and the tail overlap joint department both sides surpass the part of belted layer both sides.

The invention aims to provide a tire forming machine capable of forming a high-quality tread assembly.

a tire building machine comprises the belt drum, a first driving source for driving the belt drum to expand and contract, a second driving source for driving a supporting unit, a third driving source for driving the belt drum to rotate, a stitching device for stitching a tread layer and a control system electrically connected with the first driving source, the second driving source, the third driving source and the stitching device respectively.

The invention aims to provide a tread component forming method capable of forming a high-quality tread component.

a method of tread assembly building based on a tyre building machine as described above, the method comprising the steps of:

step 1: the control system controls the belt drum to rotate around the center line of the belt drum to fit the belt layer;

step 2: the control system controls the lifting of at least one set of support blocks from the initial position to the raised position according to the predetermined width of the belt and tread layers;

and step 3: the control system controls the belt drum to rotate around the center line of the belt drum to be attached to the tread layer, and the parts, exceeding the two sides of the belt layer, of the two sides of the head-tail lap joint of the tread layer are supported by the at least one group of supporting blocks;

and 4, step 4: and the control system controls the stitching device to roll the head and tail stitching positions of the tread layer.

Further, the control system controls at least one group of supporting blocks to be lifted from the initial position to the lifting position, and the control system specifically comprises:

the control system controls the second driving source to supply air to the at least one group of supporting blocks, and the movable supporting blocks are lifted from the initial position to the lifting position.

a method for forming a tread assembly based on a tyre building machine as described above, characterised in that it comprises the following steps:

step 1: the control system controls the belt drum to rotate around the center line of the belt drum to sequentially attach the belt layer and the tread layer;

step 2: according to the width of a belt layer and a tread layer which are determined in advance, a control system controls at least one group of supporting blocks to be lifted from an initial position to a lifting position, and parts, exceeding the two sides of the belt layer, of the two sides of the head-tail lap joint of the tread layer are supported by the at least one group of supporting blocks;

and step 3: and the control system controls the stitching device to roll the head and tail stitching positions of the tread layer.

The invention has the beneficial effects that: the invention provides a belt drum, wherein a drum tile on the belt drum is provided with a supporting unit, and the supporting unit supports the parts of the end-to-end lap joint of a tread layer, which exceed the two sides of the belt layer, so that the lap joint of the tread layer is continuously and well supported in the width direction, the integral press fit of the end-to-end lap joint of the tread layer is facilitated, the combination quality of the end-to-end lap joint of the tread layer is ensured, and a high-quality tread component is obtained. The invention also provides a tire building machine capable of obtaining high-quality tread components and a tread component forming method based on the tire building machine.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a perspective view of a belt drum with attached tread assembly provided by the present invention.

Fig. 2 is a schematic partial cross-sectional view showing a belt drum with a tread assembly applied thereto and a pressing device located at a distance above the belt drum.

FIG. 3 is another partial cross-sectional schematic view showing the belt drum with the tread assembly attached and a pressing device in contact with the tread assembly.

Fig. 4 is a schematic view of the belt drum and the electric drive source provided by the present invention.

FIG. 5 is a partial perspective view of the belt drum provided by the present invention.

Fig. 6 is a top view of fig. 5.

Fig. 7 is a perspective view of a tile of the belt drum and a support unit located thereon provided by the present invention.

FIG. 8 is a perspective view of the belt drum of FIG. 7 with a set of support blocks on the tiles raised.

Fig. 9 is a side view of fig. 8.

Fig. 10 is a top view of fig. 8.

Fig. 11 is a sectional view taken along line B-B in fig. 10.

Fig. 12 is a sectional view taken along line C-C of fig. 10.

Fig. 13 is an enlarged schematic view at a in fig. 12.

FIG. 14 is a cross-sectional view of the outer surface of a drum tile having a support unit after sequential application of a belt, cap ply and a set of support blocks on the tile have been raised.

FIG. 15 is a cross-sectional view of the application of a tread layer to the structure shown in FIG. 14.

FIG. 16 is a top view of the outer surface of a drum tile having a support unit after sequential application of a belt, cap ply and a set of support blocks on the tile have been raised.

FIG. 17 is a side view of a drum tile having a support unit with the outer surface of the tile sequentially applied with a belt, cap ply and tread layer and with a set of support blocks on the tile raised.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 to 6, an embodiment of the present invention provides a belt drum 100 applied to a tire building machine, the belt drum 100 being used for building a tread assembly 200. The tread assembly 200 is an integral part of a green tire for a tire being constructed. Specifically, the belt drum 100 includes a drum shaft assembly 1 and a drum shoe assembly 2 slidably coupled to the drum shaft assembly 1.

As shown in fig. 1 and 5, the drum shaft assembly 1 is provided with a slideway 10, the drum tile assembly 2 is provided with a slide rail member 20, the slide rail member 20 can slide in the slideway 10, and the drum tile assembly 2 can move along the radial direction of the drum shaft assembly 1 to realize the expansion and contraction of the belt drum 100 in the radial direction. As shown in fig. 2 to 4 and 12, the tire building machine further includes a stitching device 300, a first driving source 500, a second driving source 600, a third driving source 700, and a control system 400 electrically connected to the stitching device 300, the first driving source 500, the second driving source 600, and the third driving source 700, respectively. In this embodiment, the stitching device 300 is preferably a multi-piece roller device having a plurality of circular shapes, which can be used to stitch together the end-to-end joints of the tire components on the tread assembly 200. The first driving source 500 and the third driving source 700 are preferably electric driving sources for controlling the expansion and contraction and rotation of the belt drum 100, respectively. The second driving source 600 is preferably a pneumatic driving source.

As shown in fig. 1, 4 to 6, the drum shaft assembly 1 includes a drum shaft 11, fixing plates 12 provided on both sides of the drum shaft 11, and a plurality of fixing rods 13 supporting and positioning the two fixing plates 12. The two fixing plates 12 are axially symmetrically arranged, the slide way 10 is fixed on the inner sides of the two fixing plates 12, and the drum tile assembly 2 is positioned between the two fixing plates 12. The drum shaft 11 of the drum shaft assembly 1 is hollow and provided with axially extending grooves 11 a. Further, the drum shaft assembly 1 further includes a moving member 14 mounted outside the drum shaft 11 and axially movable a certain distance along the drum shaft 11.

As shown in fig. 4, the belt drum 100 further includes therein a coupling assembly coupling the first driving source 500 and the moving member 14 of the drum shaft assembly 1. The connecting assembly includes a screw 501 extending axially from the first driving source 500, a nut (not shown) sleeved on the screw 501, and two connecting rods 502 radially connected to the nut. One end of the screw rod 501 extends into the drum shaft 11 along the axial direction, and the two connecting rods 502 extend through the groove 11a of the drum shaft 11 in the radial direction to be connected with the moving member 14.

As shown in fig. 1 and 5 to 17, the drum tile assembly 2 includes a plurality of drum tiles 21 arranged along a circumferential direction, and a plurality of brackets 22 fixed at a radial inner side of the plurality of drum tiles 21 and connected to the moving member 14 in an inclined sliding manner. Wherein, the sliding rail members 20 are arranged at two sides of the bracket 22 and are in sliding fit with the sliding ways 10 at the inner side of the fixing plate 12 on the drum shaft assembly 1.

As shown in fig. 7 to 17, each of the tiles 21 includes a support surface 21a having a circular arc shape, and the support surfaces 21a of the plurality of tiles 21 arranged in the circumferential direction collectively form a cylindrical support surface of the belt drum 100. Each of the drum shoes 21 includes a block-shaped body 210, and a support surface 21a, which is a radially outer surface of the body 210. Further, the first and second supporting

units

24 and 25 are mounted on the body 210 of one of the plurality of tiles 21. In the present embodiment, the first support unit 24 and the second support unit 25 are adjacently disposed in the circumferential direction of the belt drum 100. In an alternative embodiment, only the first support unit 24 or the second support unit 25 is mounted on the one of the tiles 21.

As shown in fig. 14-17, tread assembly 200 generally includes a belt 201, a cap ply 202, and a tread layer 203. The belt 201 may be referred to as a first tire component, the cap ply 202 may be referred to as a second tire component, and the tread layer 203 may be referred to as a third tire component. The belt 201, the cap ply 202 and the tread 203 are sequentially wound on the belt drum 100. The second driving source 600 may individually drive the first support unit 24, or individually drive one or more sets of support blocks on the second support unit 25 to be raised radially outward, according to the width of the belt 201. Since the width of the tread layer 203 is larger than the width of the belt layer 201 and the width of the cap ply layer 202, the part of the two ends of the end-to-end lap joint of the tread layer 203 beyond the two sides of the belt layer 201 and the cap ply layer 202 needs a set of supporting blocks or a plurality of sets of supporting blocks on the first supporting unit 24 or the second supporting unit 25 for supporting. The portion of the tread layer 203 where both ends of the end-to-end lap joint exceed both sides of the belt 201 and the cap ply 202 may also be referred to as both side ends 203a of the end-to-end lap joint of the tread layer 203. Because the existence of supporting unit, the both sides end 203a of tread layer 203 end to end overlap joint has obtained effectual support, so, when compression fittings 300 pressfitting tread layer 203 end to end overlap joint, also can the both sides end 203a of effectual pressfitting tread layer 203 end to end overlap joint from the whole joint quality of guaranteeing tread layer 203 end to end overlap joint, and then guarantee the shaping quality of tire.

As shown in fig. 2 to 4, the drum shaft 11 of the belt drum 100 is driven by the third driving source 700 to rotate, so that the belt drum 100 is driven to rotate synchronously, and the belt layer 201, the cap ply 202 and the tread layer 203 conveyed by the material conveying device (not shown) are sequentially wound and attached.

As shown in fig. 4 to 6, the bracket 22 is provided with a first inclined surface 22a, the moving member 14 is provided with a second inclined surface 14a, and the first inclined surface 22a is slidably connected with the second inclined surface 14 a. The moving member 14 is connected to a connecting rod 502, and the connecting rod 502 is disposed in a radial direction. When the first driving source 500 drives the screw rod 501 to rotate, the nut can move linearly along the screw rod 501 to drive the connecting rod 502 to move axially along the drum shaft 11, so as to further drive the moving part 14 to move axially along the drum shaft 11. Since the second inclined surface 14a of the moving member 14 is in inclined sliding engagement with the first inclined surface 22a of the support 22, the support 22 is driven to move radially by the axial movement of the moving member 14, so that the plurality of drum tiles 21 connected to the radially outer side of the support 22 also realize radial movement, and thus the overall radial expansion and contraction of the belt drum 100 is realized.

As shown in fig. 7 to 13, the tile 21 to which the first and

second support units

24 and 25 are mounted may be referred to as a housing tile. As shown in fig. 17, in the process of applying the tread layer 203 to the belt drum 100, the applying end of the tread layer 203 is located right on the outer surface of the support unit accommodating the drum shoes 21, and thus, the leading and trailing lap of the tread layer 203 is located on the outer surface of the support unit accommodating the drum shoes 21, so that both side ends 203a of the leading and trailing lap of the tread layer 203 can be supported by the support blocks on the support unit.

As shown in fig. 7 to 13 in combination with fig. 16, the first support unit 24 includes four sets of first support blocks, each set including two first support blocks 241 spaced from each other and symmetrically disposed along the width center plane of the belt drum 100. Several first support blocks 241 of the first support unit 24 extend and are aligned in the width direction or the drum axis direction of the belt drum 100. The four groups of first supporting blocks comprise a first group of first supporting blocks 2411, a second group of first supporting blocks 2412, a third group of first supporting blocks 2413 and a fourth group of first supporting blocks 2414 which are symmetrically arranged from inside to outside in sequence. The plurality of first supporting blocks 241 have the same structure, and each first supporting block 241 has a width W1. Correspondingly, as shown in fig. 8 to 11, the accommodating drum tile 21 is provided with a plurality of first grooves 211 for accommodating a plurality of first supporting blocks 241. Each first support block 241 has an initial position H1 and a lifted position H2, and is switchable between an initial position H1 and a lifted position H2. Each of the first supporting blocks 241 has a first outer surface 241a having an arc shape. When the first support block 241 is at the initial position H1, the first outer surface 241a is coplanar with the circular arc support surface 21a of the drum tile 21. As shown in fig. 17, when the first support block 241 is in the raised position H2, the first outer surface 241a is radially outward of the arc support surface 21a of the drum shoe 21 for supporting both side ends 203a where the tread layer 203 overlaps end to end. A symmetrically disposed set of first support blocks 241 are raised in synchronism for simultaneously supporting both side ends 203a of the tread layer 203 at the end-to-end lap joint.

As shown in fig. 7 to 8, 10 and 16, the second support unit 25 includes four sets of second support blocks, each set including two second support blocks 251 spaced apart from each other and symmetrical about the width center plane of the belt drum 100. The plurality of second support blocks 251 of the second support unit 25 extend and are aligned in the width direction or the drum axis direction of the belt drum 100. The four second supporting blocks include a first second supporting block 2511, a second supporting block 2512, a third second supporting block 2513 and a fourth second supporting block 2514 which are symmetrically arranged from inside to outside in sequence. The plurality of second supporting blocks 251 are identical in structure, and each of the second supporting blocks 251 has a width W2. Correspondingly, the receiving drum tile 21 is provided with a plurality of second grooves (not shown) for receiving a plurality of second supporting blocks 251.

As shown in fig. 8, each of the second supporting blocks 251 also has an initial position and a lifted position, and is switchable between the initial position and the lifted position. Each of the second supporting blocks 251 has a second outer surface 251a having an arc shape. When the second supporting block 251 is at the initial position, the second outer surface 251a is coplanar with the circular arc supporting surface 21a of the drum tile 21. When the second support block 251 is in the raised position, the second outer surface 251a is radially outward of the arc support surface 21a of the drum shoe 21 for supporting both side edges of the tread layer 203 at the end-to-end joint.

Further, as shown in fig. 7, 8 and 10, the sets of symmetrically disposed first support blocks 241 of the first support units 24 are farther from the width center plane of the belt drum 100 than the sets of symmetrically disposed second support blocks 251 of the second support units 25. Each second support block 251 is offset from each first support block 241 in the width direction of the belt drum 100.

It should be noted that the first support unit 24 and the second support unit 25 provided on the accommodating drum shoe 21 disclosed in the embodiment of the present invention are not generally used at the same time, but both side ends 203a where the tread layer 203 is overlapped end to end by the first support unit 24 or the second support unit 25 are determined according to the actual width of the belt layer 201.

When the width between the outer edges of a set of first support blocks 241 symmetrically disposed in the first support unit 24 corresponds to the width of the belt layer 201, the first support unit 24 is determined to support both side ends 203a where the tread layer 203 is overlapped end to end. At this time, the second driving source 600 drives at least one set of first support blocks 241 located axially outward of the set of first support blocks 241 and radially inward of the tread layer 203 to be lifted for supporting both side ends 203a of the tread layer 203 at the leading and trailing lap joints. The set of first support blocks 241 and the axially inner first support blocks 241 thereof may each be pre-locked. As can be seen from the width of the belt 201, the second support unit 25 is not required to be used in the formation of the tread assembly, and therefore, the second support blocks 251 on the second support unit 25 are also pre-locked to remain in place.

When the width between the symmetrically arranged set of second support blocks 251 of the second support unit 25 corresponds to the belt width, then the second support unit 25 is determined to support both side ends 203a of the tread layer 203 at the end-to-end lap. The second drive source 600 drives at least one set of second support blocks 251 axially outward of the set of second support blocks 251 and radially inward of the tread layer 203 to be raised for supporting both side ends 203a of the tread layer 203 at the butt-lap joint. As can be seen from the width of the belt 201, the first supporting unit 24 is not required to be used in the formation of the tread assembly, and therefore, the first supporting blocks 241 on the first supporting unit 24 are locked in advance to be kept in place.

In an alternative embodiment, only the first support unit 24 is provided on the housing drum tile 21 alone, or the second support unit 25 is provided on the housing drum tile alone. When the first and

second support units

24 and 25 are provided on the housing drum shoe 21 at the same time, the belt drum 100 can accommodate belt layers 201 of various specifications having a larger width range.

As shown in fig. 10, the distance between the outer edges of the first group of symmetrically arranged first supporting blocks 2411 in the first supporting unit 24 is D11, and the distance between the outer edges of the second group of symmetrically arranged first supporting blocks 2412 in the first supporting unit 24 is D12. The distance between the outer edges of the first and second symmetrically disposed sets of

support blocks

2511 and 2512 in the second support unit 25 is D21, and the distance between the outer edges of the second symmetrically disposed sets of support blocks 2512 and D22.

As shown in fig. 14 to 17, when the width of the belt layer 201 is D11, both side ends of the belt layer 201 attached to the outside of the belt drum 100 cover the first group of first support blocks 2411. When the tread layer 203 needs to be applied to the belt drum 100 after the cap ply 202 is applied to the belt drum 100, the third driving source 700 drives the belt drum 100 to rotate by a certain angle so that the position where the front end of the tread layer 203 is applied to the belt drum 100 is on the radially outer surface of the first support unit 24. In this way, when the tread layer 203 is completely wound and fitted on the outer surface of the belt drum 100, the end-to-end lap of the tread layer 203 is located at the radial outer side of the first support unit 24. Second drive source 600 may drive second set of second support blocks 2412 located adjacent axially outward from first set of first support blocks 2411 and radially inward from the end-to-end overlap of tread layer 203 to lift to support both ends 203a of tread layer 203 at the end-to-end overlap. Similarly, when the width of the belt layer 201 is D21, the second driving source 600 drives the third group of second supporting blocks 2413 to be lifted to support both side ends 203a of the tread layer 203 at the end-to-end lap.

As shown in fig. 12 and 13, the first supporting unit 24 further includes a first piston 242 and two first connecting rods 243 fixedly connected below each first supporting block 241. Two first connecting rods 243 are located at two sides of the first piston 242. Correspondingly, the receiving shell 21 is provided with a plurality of first receiving cavities 213 for receiving the plurality of first pistons 242 and a plurality of first receiving cavities 214 for receiving the plurality of first connecting rods 243. Further, a plurality of air passages 215 communicated with the plurality of first accommodating cavities 213 are further disposed in the accommodating drum tile 21, and the second driving source 600 ventilates the first accommodating cavities 214 through the air passages 215, thereby pushing the first piston 242 to move upward. It should be noted that the first supporting unit 24 further includes an elastic restoring member 244 sleeved outside the first connecting rod 243 and accommodated in the first accommodating cavity 214. The upper end of the elastic restoring member 244 abuts against the inner upper surface of the first receiving chamber 214, and the lower end thereof abuts against the lower end circumferential flange of the first connecting rod 243. In this embodiment, the elastic restoring member 244 may have a spring structure.

When the second driving source 600 continues to ventilate the air passage 215 when the first support block 241 needs to be moved to the lifted position H2, the first piston 242 is pushed upward, thereby pushing the first support block 241 to move from the initial position H1 to the lifted position H2. At the same time, the first connecting rod 243 is also moved upward together with the first supporting block 241, so that the lower end of the elastic restoring member 244 is also moved upward together, so that the elastic restoring member 244 is compressed. When the first supporting block 241 needs to move to the initial position H1 and the second driving source 600 stops ventilating the air passage 215, the first piston 242 may fall back by its own weight on the one hand, and on the other hand, the elastic restoring member 244 is restored to the initial state from the compressed state, and the first connecting rod 243 is also moved down to the original position by the restoring force of the elastic restoring member 244. Thus, the first supporting block 241 is returned to the initial position H1 from the lifted position H2 by the first connecting rod 243 and the first piston 242.

The second supporting unit 25 also includes a second piston fixedly coupled below each of the second supporting blocks 251 and two first connecting rods (not shown), and the second supporting unit 25 has the same structure as the first supporting unit 24. Correspondingly, the accommodating drum tile 21 is also provided with a plurality of second accommodating cavities for accommodating a plurality of second pistons and a plurality of second accommodating cavities for accommodating a plurality of second connecting rods. Further, a plurality of air passages communicated with the plurality of second accommodating cavities are further arranged in the accommodating drum tiles 21. The operation principle of the second supporting block 251 in the second supporting unit 25 is the same as that of the first supporting block 241 in the second supporting unit 25, and will not be described in detail.

It should be noted that, before the tread assembly is formed, which set or sets of the first support unit 24 are fixed or movable, or which set or sets of the second support unit 25 are fixed or movable, may be determined according to the predetermined width of the belt layer 201 and the width of the tread layer 203, and the predetermined distance between the outer edges of each set of support blocks on the first support unit 24 and the second support unit 25. The support block on the first support unit 24 or the second support unit 25 can be locked to the receiving drum shoe 21 by screws. The support blocks to be fixed may be pre-locked to the receiving drum tile 21 by screws and the remaining support blocks may be moved from the initial position H1 to the raised position H2 by the pneumatic drive 600 source.

In another embodiment, only the first supporting unit 24 or the second supporting unit 25 is disposed on the accommodating drum tile 21, and the supporting blocks on the first supporting unit 24 or the second supporting unit 25 are movable and are respectively communicated with the second driving source 600 through the air passages. While each support block on the first support unit 24 or the second support unit 25 is provided with sensors that are electrically connected to a control system 400 (shown in fig. 4) of the molding machine. The sensor may be a photoelectric sensor or a magnetic sensor. When the sensor is a magnetic sensor, the magnetic sensor may sense the metal within the belt 201. When the belt 201 is applied to the belt drum 100, a detection signal is generated and sent to the control system 400 by the support blocks sensing the metal pieces in the belt 201. Meanwhile, the support blocks of the metal pieces that are not induced into the belt 201 do not produce a detection signal. When the cap ply layer 202 is attached to the outside of the belt 201, the control system 400 of the forming machine controls the second driving source 600 to send no detection signal, that is, to sense the supply of air to the support block of the belt 201. The support blocks which do not sense the belt 201 are driven to the raised position H2 for supporting both side ends 203a of the tread layer 203 at the end-to-end joint.

Based on the tire building machine described above, embodiments of the present invention also provide a method of building a tread assembly, including the steps of:

step 1: the control system 400 controls the belt drum 100 to rotate around the central line of the belt drum and sequentially attach the belt layer 201, the cap ply layer 202 and the tread layer 203;

step 2: the control system 400 controls the lifting of at least one movable set of support blocks from the initial position H1 to the raised position H2 according to the predetermined width of the belt layer 201 and tread layer 203, the portions 203a of the tread layer 203 beyond the two sides of the belt layer are supported by the raised at least one set of support blocks at the two sides of the end-to-end lap;

and step 3: control system 400 controls stitching device 300 to roll the end-to-end lap of tread layer 203.

Further, in step 2, the control system 400 controls at least one movable supporting block to be lifted from the initial position H1 to the lifted position H2, specifically:

the control system 40 controls the second drive source 600 to supply air to the at least one set of movable support blocks that are raised from the initial position H1 to the raised position H2.

In another embodiment, the tread assembly molding method may further include the steps of:

step 1: the control system 400 controls the belt drum 100 to rotate around the center line of the belt drum and sequentially attach the belt layer 201 and the cap ply layer 202;

step 2: based on the predetermined width of the belt 201, the control system 400 controls at least one movable support block to be lifted from the initial position H1 to the lifted position H2;

and step 3: the control system 400 controls the belt drum 100 to be attached to the tread layer 203 in a rotating mode around the center line of the belt drum, at least one group of movable supporting blocks are located on the axial outer side of the belt layer 201 and the radial inner sides of two side ends 203 of the head-tail splicing part of the tread layer 203, and the at least one group of movable supporting blocks support the parts 203a of the two sides of the head-tail splicing part of the tread layer 203, which exceed the two sides of the belt layer;

and 4, step 4: control system 400 controls stitching device 300 to roll the end-to-end splice of tread layer 203.

the control system 40 controls the second drive source 600 to supply air to at least one set of movable support blocks that are raised from the initial position H1 to the raised position H2.

step 1: the control system 400 controls the belt drum 100 to rotationally attach the belt layer 201 around the central line of the belt drum;

and step 3: the control system 400 controls the belt drum 100 to rotate around the center line of the belt drum to be attached to the tread layer 203, the at least one group of support blocks are positioned on the axial outer side of the belt layer 201 and the radial inner sides of two side ends of the head-tail splicing part of the tread layer 203, and the parts 203a of two sides of the head-tail splicing part of the tread layer 203, which exceed the two sides of the belt layer, are supported by the at least one group of raised support blocks;

step 1: the control system 400 controls the belt drum 100 to rotationally attach the belt layer 201 and the tread layer 203 around the central line of the belt drum;

step 2: the control system 400 controls the lifting of at least one movable group of support blocks from the initial position H1 to the lifted position H2 according to the predetermined width of the belt layer 201 and the tread layer 203, the portion 203a of the tread layer 203 beyond the two sides of the belt layer is supported by the lifted at least one group of support blocks at the two sides of the head-to-tail lap;

and step 3: control system 400 controls stitching device 300 to roll the end-to-end splice of tread layer 203.

step 1: the control system 400 controls the belt drum 100 to rotate around the central line of the belt drum and sequentially attach the belt layer 201 and the tread layer 203;

step 2: the control system 400 controls at least one group of support blocks in which the belt layer 201 is not detected to be lifted from the initial position H1 to the lifted position H2, and the portion 203a of the tread layer 203 beyond the two sides of the belt layer at the end-to-end lap joint is supported by the lifted at least one group of support blocks;

step 2: the control system 400 controls at least one group of support blocks not detecting the belt 201 to be lifted from the initial position H1 to the lifted position H2;

and step 3: the control system 400 controls the belt drum 100 to be rotationally attached to the tread layer 203 around the central line of the belt drum, and the parts 203a of the two sides of the head-tail lap joint of the tread layer 203, which exceed the two sides of the belt layer 201, are supported by at least one set of support blocks which are lifted;

In summary, according to the belt drum provided by the invention, the support unit is mounted on one drum tile on the belt drum, and the support unit supports the parts of the end-to-end lap joint of the tread layer, which exceed the two sides of the belt layer, so that the lap joint of the tread layer is continuously and well supported in the width direction, the integral pressing of the end-to-end lap joint of the tread layer is facilitated, the combination quality of the end-to-end lap joint of the tread layer is ensured, and a high-quality tread assembly is obtained. The present invention is a tire building machine including the above belt drum and a tread component molding method based on the tire building machine, so that the tire building machine and the tread component molding method based on the tire building machine can obtain a high-quality tread component.

In the description of the embodiments, discussion of the phrases "in this embodiment," "in one embodiment," "in a particular embodiment," and the like, is intended to mean that a particular feature or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. And in particular embodiments, the schematic representations of the terms used above do not necessarily refer to the same embodiment. Furthermore, the particular features or points described may be combined in any suitable manner in any one or more embodiments.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A belt drum for building a tread assembly comprising a belt layer and a tread layer, the belt drum being rotatable for applying the belt layer and the tread layer in sequence, the tread layer having a width greater than the width of the belt layer, the belt drum comprising:

2. The belt drum as claimed in claim 1, wherein the drum shaft assembly further comprises fixing plates provided at both sides of the drum shaft, a plurality of fixing rods supporting and positioning the two fixing plates, and a moving member installed outside the drum shaft and movable a certain distance in an axial direction of the drum shaft.

3. Belt drum according to claim 2, characterized in that the tile assembly further comprises supports fixed radially inside the plurality of tiles, the moving member being connected to the supports in an inclined sliding manner, and both sides of the tile assembly being connected to both sides of the drum shaft assembly in a radial sliding manner.

4. Belt drum according to claim 1, characterised in that the support unit further comprises a piston fixedly connected below each support block and two connecting rods located on either side of the piston, the drum tiles being provided with a housing chamber for the piston and a housing chamber for the connecting rods.

5. The belt drum as claimed in claim 4, wherein the receiving shell further has an air passage communicating with the plurality of receiving cavities, and the support unit further includes an elastic restoring member sleeved outside the connecting rod and received in the receiving cavity.

6. The belt drum as claimed in claim 5, wherein the support unit further comprises an elastic restoring member sleeved outside the connecting rod and received in the receiving cavity.

7. Belt drum according to claim 1, characterised in that the support blocks on the support units covered by the belt layer are locked to the drum tiles and the remaining support blocks on the support units are radially movable.

8. Belt drum according to claim 1, in which a sensor for sensing the belt layer is arranged in a support block on the support unit.

9. Belt drum for building a tread assembly comprising at least a belt layer and a tread layer, the belt drum being rotatable for applying the belt layer and the tread layer in turn, the tread layer having a width greater than the width of the belt layer, characterized in that the belt drum comprises:

10. Belt drum according to claim 9, characterised in that the support unit further comprises a piston fixedly connected below each support block and two connecting rods located on either side of the piston, the drum tiles being provided with a housing chamber for the piston and a housing chamber for the connecting rods.

11. The belt drum as claimed in claim 10, wherein the receiving shell further has an air passage communicating with the plurality of receiving cavities, and the support unit further includes an elastic restoring member sleeved outside the connecting rod and received in the receiving cavity.

12. A tire building machine characterized by: comprising a belt drum according to any one of claims 1 to 9, a first drive source for driving the belt drum to expand and contract, a second drive source for driving the support unit, a third drive source for driving the belt drum to rotate, a stitching device for stitching the tread layer, and a control system electrically connected to the first drive source, the second drive source, the third drive source and the stitching device, respectively.

13. A method of tread assembly building based on the tyre building machine of claim 12, characterized in that it comprises the steps of:

14. The method of molding a tread assembly as recited in claim 13, wherein the control system controlling the raising of the at least one set of support blocks from the initial position to the raised position comprises:

15. A method of tread assembly building based on the tyre building machine of claim 12, characterized in that it comprises the steps of: