Belt drum, tire building machine and tread assembly building method

Abstract

The present invention discloses a belt drum for molding a tread assembly, the tread assembly includes a belt layer and a tread layer, the belt drum can rotate to sequentially fit the belt layer and the tread layer, the width of the tread layer is greater than the width of the belt layer, and the belt drum includes: a drum shaft assembly including a drum shaft; a drum shoe assembly installed radially outside the drum shaft, including a plurality of drum shoes, the plurality of drum shoes can move radially relative to the drum shaft; a support unit is arranged on one of the plurality of drum shoes, the support unit includes a plurality of groups of support blocks, each group of support blocks includes two support blocks symmetrically arranged along the central plane of the width of the belt drum, at least one group of support blocks located axially outside the belt layer and radially inside the tread layer can be moved to a lifting position, and is used to support the parts of the tread layer on both sides of the head and tail overlap that exceed the belt layer on both sides. A high-quality tread assembly can be obtained by the belt drum. The present invention discloses a tire molding machine having the above-mentioned belt drum and a tread assembly molding method.

Description

Technical Field

[0001] The invention relates to the technical field of tire molding, and in particular to a belt drum, a tire molding machine and a tread assembly molding method. Background Art

[0002] Tires are circular elastic rubber products that roll on the ground and are installed on various vehicles. They are usually installed on metal rims and can support the vehicle body. Currently, all tires available on the market are formed by vulcanizing tire embryos in a vulcanizer. Automobile tire embryos are usually composed of two parts: the tread component and the carcass component. The tread component includes a buffer layer (or belt layer), a cap layer, and a tread layer. The tread is used to directly contact the road surface. The carcass component includes an inner liner, a sidewall layer, a bead, and a cord layer.

[0003] The tire blank is formed by a tire forming machine, which generally includes a belt drum, a tread component conveying device, a forming drum, a carcass component conveying device, and a transfer ring device. Among them, the belt drum is set on the side of the tread conveying device, and the forming drum is set on the side of the carcass component feeding device. When forming the tread component, the tread component feeding device first cuts the belt layer material to a fixed length and conveys it to the circumferential surface of the belt drum; then the tread component feeding device conveys the cap band material to the circumferential outer surface of the belt layer of the belt drum; finally, the tread component feeding device conveys the tread material cut to a fixed length to the circumferential outer surface of the cap band material of the belt drum.

[0004] It should be noted that, since the width of the tire surface is greater than that of the belt material and the cap material, when the overlapping parts of the tire surface at both ends need to be sewn or pressed, the tire surface part beyond the belt material and the cap material cannot be effectively rolled, sewn or pressed, resulting in poor joint quality of the tire surface. In the prior art, manual bonding is used, which is not conducive to the automated production of tire blanks. Summary of the invention

[0005] The purpose of the present invention is to provide a belt drum which can flexibly support the parts of the tread layer on both sides of the head-to-tail overlap that exceed the belt layer according to the belt layer width and the tread layer width, so as to facilitate the overall pressing of the head-to-tail overlap of the tread layer to obtain a high-quality tread assembly.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A belt drum is used for forming a tread assembly, wherein the tread assembly comprises a belt layer and a tread layer, and the belt drum can rotate to sequentially fit the belt layer and the tread layer, wherein the width of the tread layer is greater than the width of the belt layer, and the belt drum comprises:

[0008] A drum shaft assembly, comprising a drum shaft located at the center of the belt drum;

[0009] A drum shoe assembly is installed on the radially outer side of the drum shaft, and includes a plurality of drum shoes arranged along the circumferential direction, and the plurality of drum shoes can move radially relative to the drum shaft;

[0010] A support unit is arranged on one of the drum tiles, and the support unit comprises a plurality of groups of support blocks, each group of support blocks comprises two support blocks symmetrically arranged along the center plane of the belt drum width, and at least one group of support blocks located axially outside the belt layer and radially inside the tread layer can be moved to a raised position to support the parts of the tread layer that extend beyond the two sides of the belt layer at both ends of the overlapped joint.

[0011] Furthermore, the drum shaft assembly also includes fixed plates arranged on both sides of the drum shaft, a plurality of fixed rods that support and position the two fixed plates, and a movable member installed outside the drum shaft and capable of moving a certain distance along the axial direction of the drum shaft.

[0012] Furthermore, the drum shoe assembly also includes a plurality of brackets fixed on the radial inner side of the plurality of drum shoes, the movable member is obliquely and slidably connected to the plurality of brackets, and both sides of the drum shoe assembly are radially and slidably connected to both sides of the drum shaft assembly.

[0013] Furthermore, the support unit also includes a piston and two connecting rods fixedly connected to the bottom of each support block, the two connecting rods are located on both sides of the piston, and the drum shoe is provided with a receiving cavity for receiving the piston and a receiving cavity for receiving the connecting rod.

[0014] Furthermore, an air passage communicating with a plurality of receiving cavities is also provided in the receiving drum shoe, and the supporting unit also includes an elastic reset member sleeved outside the connecting rod and received in the receiving cavity.

[0015] Furthermore, the support unit also includes an elastic return member which is sleeved outside the connecting rod and accommodated in the accommodating cavity.

[0016] Further, the support blocks on the support unit that are covered by the belt layer are locked to the drum shoe, and the remaining support blocks on the support unit can move radially.

[0017] Furthermore, a sensor for sensing the belt layer is provided in a support block on the support unit.

[0018] To achieve this object, the present invention adopts the following technical solutions:

[0019] A belt drum is used for forming a tread assembly, the tread assembly at least comprising a belt layer and a tread layer, the belt drum can rotate to sequentially fit the belt layer and the tread layer, the width of the tread layer is greater than the width of the belt layer, and the belt drum comprises:

[0020] A drum shaft assembly, comprising a drum shaft located at the center of the belt drum;

[0021] A drum shoe assembly is installed on the radially outer side of the drum shaft, and includes a plurality of drum shoes arranged along the circumferential direction, and the plurality of drum shoes can move radially relative to the drum shaft;

[0022] A first support unit and a second support unit are arranged on one of the drum tiles, the first support unit includes a plurality of first support blocks extending in the axial direction, the second support unit includes a plurality of second support blocks extending in the axial direction, the plurality of first support blocks or the plurality of second support blocks are symmetrically arranged along the width center plane of the belt drum, at least two symmetrical first support blocks or the second support blocks located axially outside the belt layer and radially inside the tread layer can be moved to a raised position to support the parts of the tread layer that extend beyond the two sides of the belt layer at both sides of the head and tail overlap.

[0023] Furthermore, the support unit also includes a piston and two connecting rods fixedly connected to the bottom of each support block, the two connecting rods are located on both sides of the piston, and the drum shoe is provided with a receiving cavity for receiving the piston and a receiving cavity for receiving the connecting rod.

[0024] Furthermore, an air passage communicating with a plurality of receiving cavities is also provided in the receiving drum shoe, and the supporting unit also includes an elastic reset member sleeved outside the connecting rod and received in the receiving cavity.

[0025] An object of the present invention is to provide a tire building machine capable of building high-quality tread components.

[0026] In order to achieve the above object, the present invention adopts the following technical solutions:

[0027] A tire forming machine comprises the belt drum as described above, 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 laminating device for laminating a tread layer, and a control system electrically connected to the first driving source, the second driving source, the third driving source and the laminating device respectively.

[0028] An object of the present invention is to provide a tread component molding method capable of molding a high-quality tread component.

[0029] In order to achieve the above object, the present invention adopts the following technical solutions:

[0030] A method for forming a tread component based on the tire forming machine as described above, the method comprising the following steps:

[0031] Step 1: The control system controls the belt drum to rotate around its own center line to fit the belt layer;

[0032] Step 2: According to the predetermined widths of the belt layer and the tread layer, the control system controls at least one group of support blocks to rise from an initial position to a raised position;

[0033] Step 3: The control system controls the belt drum to rotate around its own center line to fit the tread layer, and the parts of the tread layer on both sides of the head-to-tail overlap extending beyond the belt layer are supported by the at least one group of support blocks;

[0034] Step 4: The control system controls the pressing device to roll the head and tail joints of the tread layer.

[0035] Further, the control system controls at least one group of support blocks to rise from an initial position to a raised position, specifically comprising:

[0036] The control system controls the second driving source to supply air to the at least one group of support blocks, and the movable support blocks rise from an initial position to a raised position.

[0037] In order to achieve the above object, the present invention adopts the following technical solutions:

[0038] A tread component molding method based on the tire molding machine as described above, characterized in that the method comprises the following steps:

[0039] Step 1: The control system controls the belt drum to rotate around its own center line to sequentially attach the belt layer and the tread layer;

[0040] Step 2: According to the predetermined widths of the belt layer and the tread layer, the control system controls at least one group of support blocks to rise from the initial position to the raised position, and the portions of the tread layer on both sides of the head-to-tail overlap extending beyond the belt layer are supported by the at least one group of support blocks;

[0041] Step 3: The control system controls the pressing device to roll the head and tail joints of the tread layer.

[0042] Beneficial effects of the invention: The invention provides a belt drum, a drum tile on which a support unit is installed, and the support unit supports the part of the tread layer overlapped at both ends beyond the belt layer, so that the tread layer overlap is continuously and well supported in the width direction, which is conducive to the overall pressing of the tread layer overlapped at both ends, ensuring the bonding quality of the tread layer overlapped at both ends, thereby obtaining a high-quality tread assembly. The invention also provides a tire molding machine capable of obtaining a high-quality tread assembly and a tread assembly molding method based on the tire molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0044] Figure 1 The figure is a three-dimensional view of a belt drum with a tread assembly attached thereto provided by the present invention.

[0045] Figure 2 It is a partial cross-sectional schematic diagram showing a belt drum with a tread assembly attached thereto and a pressing device located a certain distance above the belt drum.

[0046] Figure 3 It is another partial cross-sectional schematic diagram showing a belt drum with a tread assembly attached thereto and a pressing device in contact with the tread assembly.

[0047] Figure 4 It is a schematic diagram of the coordination between the belt drum and the electric drive source provided by the present invention.

[0048] Figure 5 It is a partial stereoscopic view of the belt drum provided by the present invention.

[0049] Figure 6 yes Figure 5 Top view of the .

[0050] Figure 7 The present invention is a stereoscopic view of a drum shoe of a belt drum and a supporting unit located on the drum shoe.

[0051] Figure 8 yes Figure 7 A perspective view of a set of support blocks on a drum shoe of a belt drum is shown with the support blocks raised.

[0052] Fig. 9 yes Figure 8 Side view of.

[0053] Fig.10 yes Figure 8 Top view of the .

[0054] Fig.11 is along Fig.10 Sectional view along line BB.

[0055] Fig.12 is along Fig.10 Sectional view along the CC line.

[0056] Fig.13 yes Fig.12 A magnified schematic diagram of center A.

[0057] Fig.14 It is a cross-sectional view of the outer surface of a drum tile with a support unit, after which a belt layer and a cap layer are sequentially attached, and a group of support blocks on the drum tile are lifted.

[0058] Fig.15 exist Fig.14 A cross-sectional view of the tread layer attached to the base of the structure shown.

[0059] Fig.16 It is a top view of the outer surface of the drum tile with support units, after which the belt layer and the cap layer are attached in sequence, and a group of support blocks on the drum tile are lifted.

[0060] Fig.17 It is a side view of a drum tile having a support unit, after the outer surface of the drum tile is sequentially attached to the belt layer, the cap layer and the tread layer, and a group of support blocks on the drum tile are lifted. DETAILED DESCRIPTION

[0061] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0062] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0063] like Figures 1 to 6 As shown, the embodiment of the present invention provides a belt drum 100 applied to a tire building machine, and the belt drum 100 is used to build a tread assembly 200. The tread assembly 200 is an essential component of building a tire embryo. Specifically, the belt drum 100 includes a drum shaft assembly 1 and a drum shoe assembly 2 slidably connected to the drum shaft assembly 1.

[0064] like Figure 1 and Figure 5 As shown, the drum shaft assembly 1 is provided with a slideway 10, and the drum shoe assembly 2 is provided with a slide rail 20, the slide rail 20 can slide in the slideway 10, and the drum shoe assembly 2 can move along the radial direction of the drum shaft assembly 1 to achieve the expansion and contraction of the belt drum 100 in the radial direction. Figures 2 to 4 and Fig.12 As shown, the tire building machine also includes a pressing 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 pressing device 300, the first driving source 500, the second driving source 600, and the third driving source 700. In this embodiment, the pressing device 300 is preferably a multi-piece pressing roller device composed of a plurality of circular rollers, which can press the head and tail 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, which are respectively used to control the expansion and contraction and rotation of the belt drum 100. The second driving source 600 is preferably a pneumatic driving source.

[0065] like Figure 1 , Figures 4 to 6As shown, the drum shaft assembly 1 includes a drum shaft 11, fixed plates 12 arranged on both sides of the drum shaft 11, and a plurality of fixed rods 13 that support and position the two fixed plates 12. The two fixed plates 12 are axially symmetrically arranged, the slideway 10 is fixed to the inner side of the two fixed plates 12, and the drum shoe assembly 2 is located between the two fixed plates 12. The drum shaft 11 of the drum shaft assembly 1 is hollow and is provided with an axially extending groove 11a. Furthermore, the drum shaft assembly 1 also includes a moving member 14 installed outside the drum shaft 11 and can move a certain distance axially along the drum shaft 11.

[0066] like Figure 4 As shown, the belt drum 100 also includes a connecting assembly connecting the first driving source 500 and the moving member 14 of the drum shaft assembly 1. The connecting assembly includes a screw rod 501 extending axially from the first driving source 500, a nut (not shown) sleeved on the screw rod 501, and two connecting rods 502 radially connected to the nut. Among them, one end of the screw rod 501 extends axially into the drum shaft 11, and the two connecting rods 502 extend radially through the groove 11a of the drum shaft 11 and connect with the moving member 14.

[0067] like Figure 1 and Figures 5 to 17 As shown, the drum shoe assembly 2 includes a plurality of drum shoes 21 arranged along the circumferential direction, and a plurality of brackets 22 fixed to the radial inner side of the plurality of drum shoes 21 and obliquely slidably connected to the moving member 14. Among them, the slide rail member 20 is arranged on both sides of the bracket 22 and slidably cooperates with the slideway 10 on the inner side of the fixed plate 12 on the drum shaft assembly 1.

[0068] like Figures 7 to 17 As shown, each drum tile 21 includes a supporting surface 21a in the shape of an arc, and the supporting surfaces 21a of several drum tiles 21 arranged in the circumferential direction together form a cylindrical supporting surface of the belt drum 100. Each drum tile 21 includes a block-shaped body 210, and the supporting surface 21a is the radial outer surface of the body 210. Further, a first supporting unit 24 and a second supporting unit 25 are installed on the body 210 of one drum tile 21 among the several drum tiles 21. In this embodiment, the first supporting unit 24 and the second supporting unit 25 are adjacently arranged in the circumferential direction of the belt drum 100. In an alternative embodiment, only the first supporting unit 24 or the second supporting unit 25 is installed on the above-mentioned one drum tile 21.

[0069] like Figures 14 to 17As shown, the tread assembly 200 generally includes a belt layer 201, a cap layer 202 and a tread layer 203. The belt layer 201 can be called a first tire component, the cap layer 202 can be called a second tire component, and the tread layer 203 can be called a third tire component. The belt layer 201, the cap layer 202 and the tread layer 203 are sequentially wound on the belt drum 100. According to the width of the belt layer 201, the second driving source 600 can drive the first support unit 24 alone, or drive a group of support blocks or multiple groups of support blocks on the second support unit 25 to lift radially outward. Since the width of the tread layer 203 is greater than the width of the belt layer 201 and the cap layer 202, the parts of the two ends of the tread layer 203 that exceed the two sides of the belt layer 201 and the cap layer 202 at the head and tail overlap need to be supported by a group of support blocks or multiple groups of support blocks on the first support unit 24 or the second support unit 25. The parts of the two ends of the head-to-tail overlap of the tread layer 203 that extend beyond the two sides of the belt layer 201 and the cap layer 202 can also be referred to as the two side ends 203a of the head-to-tail overlap of the tread layer 203. Due to the existence of the support unit, the two side ends 203a of the head-to-tail overlap of the tread layer 203 are effectively supported, so that when the laminating device 300 presses the head-to-tail overlap of the tread layer 203, the two side ends 203a of the head-to-tail overlap of the tread layer 203 can also be effectively pressed, thereby ensuring the overall bonding quality of the head-to-tail overlap of the tread layer 203, and further ensuring the molding quality of the tire.

[0070] like Figures 2 to 4 As shown, the drum shaft 11 of the belt drum 100 can be driven to rotate by the third driving source 700, thereby driving the belt drum 100 to rotate synchronously, so as to sequentially wind up and bond the belt layer 201, cap layer 202 and tread layer 203 conveyed by the material conveying device (not shown).

[0071] like Figures 4 to 6 As shown, the support 22 is provided with the first inclined surface 22a, and the moving member 14 is provided with the second inclined surface 14a, and the first inclined surface 22a is slidably connected with the second inclined surface 14a. The moving member 14 is connected to the connecting rod 502, and the connecting rod 502 is arranged along the radial direction. When the first driving source 500 drives the screw rod 501 to rotate, the nut can move along the screw rod 501 straight line to drive the connecting rod 502 to move axially along the drum shaft 11, thereby further driving the moving member 14 to move axially along the drum shaft 11. Because the second inclined surface 14a of the moving member 14 is tilted and slidably matched with the first inclined surface 22a of the support 22, the axial movement of the moving member 14 drives the support 22 to move radially, and the several drum tiles 21 connected to the radial outer side of the support 22 have also realized radial movement, so that the overall radial expansion and contraction of the belt drum 100 has been realized.

[0072] like Figures 7 to 13 As shown, the drum shoe 21 equipped with the first support unit 24 and the second support unit 25 can be called a receiving drum shoe. Fig.17 As shown, during the process of the tread layer 203 being bonded to the belt drum 100, the bonded end of the tread layer 203 is located just on the outer surface of the support unit accommodating the drum shoe 21, so that the head and tail overlaps of the tread layer 203 are located on the outer surface of the support unit accommodating the drum shoe 21, so that the two side ends 203a of the head and tail overlaps of the tread layer 203 can be supported by the support blocks on the support unit.

[0073] like Figures 7 to 13 Combined with Fig.16 As shown, the first support unit 24 includes four groups of first support blocks, and each group of first support blocks includes two first support blocks 241 that are spaced apart from each other and symmetrically arranged along the width center plane of the belt drum 100. The several first support blocks 241 of the first support unit 24 extend and are aligned along the width direction of the belt drum 100 or the drum axis direction. The four groups of first support blocks include a first group of first support blocks 2411, a second group of first support blocks 2412, a third group of first support blocks 2413 and a fourth group of first support blocks 2414 that are symmetrically arranged from the inside to the outside. The structures of the several first support blocks 241 are the same, and the width of each first support block 241 is W1. Correspondingly, as Figures 8 to 11 As shown, the drum housing 21 is provided with a plurality of first grooves 211 for accommodating a plurality of first support blocks 241. Each first support block 241 has an initial position H1 and a raised position H2, and can be switched between the initial position H1 and the raised position H2. Each first support block 241 has an arc-shaped first outer surface 241a. When the first support block 241 is at the initial position H1, the first outer surface 241a is coplanar with the arc support surface 21a of the drum housing 21. Fig.17 As shown, when the first support block 241 is at the lifting position H2, the first outer surface 241a is radially outside the arc support surface 21a of the drum shoe 21, and is used to support the two side ends 203a of the head-to-tail overlap of the tread layer 203. A group of symmetrically arranged first support blocks 241 are lifted synchronously, and are used to simultaneously support the two side ends 203a of the head-to-tail overlap of the tread layer 203.

[0074] like Figures 7 and 8 , Fig.10 and Fig.16As shown, the second support unit 25 includes four groups of second support blocks, and each group of second support blocks includes two second support blocks 251 that are spaced apart from each other and symmetrical along 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 along the width direction of the belt drum 100 or the drum axis direction. The four groups of second support blocks include a first group of second support blocks 2511, a second group of second support blocks 2512, a third group of second support blocks 2513 and a fourth group of second support blocks 2514 that are symmetrically arranged from the inside to the outside. The structures of the plurality of second support blocks 251 are the same, and the width of each second support block 251 is W2. Correspondingly, the accommodating drum shoe 21 is provided with a plurality of second grooves (not shown) for accommodating the plurality of second support blocks 251.

[0075] like Figure 8 As shown, each second support block 251 also has an initial position and a raised position, and can be switched between the initial position and the raised position. Each second support block 251 has a second outer surface 251a in an arc shape. When the second support block 251 is in the initial position, the second outer surface 251a is coplanar with the arc support surface 21a of the drum shell 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 shell 21, and is used to support the two side edges of the head and tail overlap of the tread layer 203.

[0076] Furthermore, if Figure 7 , Figure 8 and Fig.10 As shown, the several groups of symmetrically arranged first support blocks 241 in the first support unit 24 are further away from the width center plane of the belt drum 100 than the several groups of symmetrically arranged second support blocks 251 in the second support unit 25. Each second support block 251 is staggered with each first support block 241 in the width direction of the belt drum 100.

[0077] 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 generally not used at the same time. Instead, the actual width of the belt layer 201 determines whether the first support unit 24 or the second support unit 25 supports the two side ends 203a of the head and tail overlap of the tread layer 203.

[0078] When the width between the outer edges of a group of first support blocks 241 symmetrically arranged in the first support unit 24 corresponds to the width of the belt layer 201, the first support unit 24 is determined to support the two side ends 203a of the head-to-tail overlap of the tread layer 203. At this time, the second driving source 600 drives at least one group of first support blocks 241 axially outside the group of first support blocks 241 and located radially inside the tread layer 203 to lift up, so as to support the two side ends 203a of the head-to-tail overlap of the tread layer 203. The group of first support blocks 241 and the first support blocks 241 axially inside thereof can be pre-locked. It can be seen from the width of the belt layer 201 that the second support unit 25 does not need to be used in the molding of the tread assembly, so the several second support blocks 251 on the second support unit 25 are also pre-locked and kept in place.

[0079] When the width between a group of symmetrically arranged second support blocks 251 of the second support unit 25 corresponds to the width of the belt layer, the second support unit 25 is determined to support the two side ends 203a of the head-to-tail overlap of the tread layer 203. The second driving source 600 drives at least one group of second support blocks 251 axially outside the group of second support blocks 251 and located radially inside the tread layer 203 to lift up, so as to support the two side ends 203a of the head-to-tail overlap of the tread layer 203. It can be seen from the width of the belt layer 201 that the first support unit 24 does not need to be used in the molding of the tread assembly, so the first support block 241 on the first support unit 24 is pre-locked and kept in place.

[0080] In an alternative implementation, only the first support unit 24 or the second support unit 25 is provided on the accommodating drum tile 21. When both the first support unit 24 and the second support unit 25 are provided on the accommodating drum tile 21, the belt drum 100 can adapt to belt layers 201 of various specifications within a wider width range.

[0081] like Fig.10 As shown, the distance between the outer edges of the symmetrically arranged first group of first support blocks 2411 in the first support unit 24 is D11, and the distance between the outer edges of the symmetrically arranged second group of first support blocks 2412 in the first support unit 24 is D12. The distance between the outer edges of the symmetrically arranged first group of second support blocks 2511 in the second support unit 25 is D21, and the distance between the outer edges of the symmetrically arranged second group of second support blocks 2512 in the second support unit 25 is D22.

[0082] like Figures 14 to 17As shown, when the width of the belt layer 201 is D11, the two 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. After the cap layer 202 is attached to the belt drum 100, when the tread layer 203 needs to be attached to the belt drum 100, the third driving source 700 drives the belt drum 100 to rotate a certain angle, so that the front end of the tread layer 203 is attached to the position of the belt drum 100 on the radial outer surface of the first support unit 24. In this way, when the tread layer 203 is completely wrapped and attached to the outer surface of the belt drum 100, the head and tail overlap of the tread layer 203 is also located on the radial outer side of the first support unit 24. The second driving source 600 can drive the second group of second support blocks 2412 located on the adjacent axial outer sides of the first group of first support blocks 2411 and on the radial inner sides of the two sides of the head-to-tail overlap of the tread layer 203 to lift up, so as to support the two side ends 203a of the head-to-tail overlap of the tread layer 203. Similarly, when the width of the belt layer 201 is D21, the second driving source 600 drives the third group of second support blocks 2413 to lift up, so as to support the two side ends 203a of the head-to-tail overlap of the tread layer 203.

[0083] like Fig.12 and Fig.13 As shown, the first support unit 24 also includes a first piston 242 and two first connecting rods 243 fixedly connected to the bottom of each first support block 241. Among them, the two first connecting rods 243 are located on both sides of the first piston 242. Correspondingly, the accommodating drum tile 21 is provided with a plurality of first accommodating chambers 213 for accommodating a plurality of first pistons 242 and a plurality of first accommodating chambers 214 for accommodating a plurality of first connecting rods 243. Further, the accommodating drum tile 21 is also provided with a plurality of air passages 215 connected with the plurality of first accommodating chambers 213, and the second driving source 600 is ventilated into the first accommodating chamber 214 through the air passages 215, thereby pushing the first piston 242 to move upward. It should be noted that the first support unit 24 also includes an elastic reset member 244 sleeved outside the first connecting rod 243 and accommodated in the first accommodating chamber 214. The upper end of the elastic reset member 244 abuts against the inner upper surface of the first accommodating 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 return member 244 may be a spring structure.

[0084] When the first support block 241 needs to move to the lifting position H2, the second driving source 600 continues to ventilate the airway 215, and the first piston 242 is pushed upward, thereby pushing the first support block 241 to move from the initial position H1 to the lifting position H2. At the same time, the first connecting rod 243 also moves upward together with the first support block 241, so that the lower end of the elastic reset member 244 also moves upward together, so that the elastic reset member 244 is compressed. When the first support block 241 needs to move to the initial position H1, the second driving source 600 stops ventilating the airway 215, the first piston 242 can fall back by its own weight on the one hand, and on the other hand, the elastic reset member 244 returns to the initial state from the compressed state, and the first connecting rod 243 also moves downward to the original position under the driving of the restoring force of the elastic reset member 244. In this way, the first support block 241 falls back to the initial position H1 from the lifting position H2 driven by the first connecting rod 243 and the first piston 242.

[0085] The second support unit 25 also includes a second piston and two first connecting rods (not shown) fixedly connected to the bottom of each second support block 251. The second support unit 25 has the same structure as the first support unit 24. Correspondingly, the accommodating drum tile 21 is also provided with a plurality of second accommodating chambers for accommodating a plurality of second pistons and a plurality of second accommodating chambers for accommodating a plurality of second connecting rods. Furthermore, a plurality of air passages communicating with the plurality of second accommodating chambers are also provided in the accommodating drum tile 21. The working principle of the second support block 251 in the second support unit 25 is the same as the working principle of the first support block 241 in the second support unit 25, which will not be elaborated in detail here.

[0086] It should be noted that before the tread assembly is formed, which group or groups on the first support unit 24 are fixed or movable, or which group or groups on the second support unit 25 are fixed or movable can be determined based on the predetermined width of the belt layer 201 and the width of the tread layer 203, as well as the predetermined distance between the outer edges of each group of support blocks on the first support unit 24 and the second support unit 25. The support blocks on the first support unit 24 or the second support unit 25 can be locked on the accommodating drum 21 by screws. The support blocks that need to be fixed can be pre-locked on the accommodating drum 21 by screws, and the remaining support blocks can be moved from the initial position H1 to the lifting position H2 under the drive of the pneumatic drive source 600.

[0087] In another embodiment, only the first support unit 24 or the second support unit 25 is provided on the accommodating drum shoe 21, and the support blocks on the first support unit 24 or the second support unit 25 are movable and are connected to the second driving source 600 through respective air passages. At the same time, each support block on the first support unit 24 or the second support unit 25 is provided with a sensor, and the sensors are connected to the control system 400 (such as Figure 4 The sensor may be a photoelectric sensor or a magnetic sensor. When the sensor is a magnetic sensor, the magnetic sensor can sense the metal parts in the belt layer 201. When the belt layer 201 is attached to the belt drum 100, the support block that senses the metal parts in the belt layer 201 generates a detection signal and sends it to the control system 400. At the same time, the support block that does not sense the metal parts in the belt layer 201 will not produce a detection signal. After the cap layer 202 is attached to the outside of the belt layer 201, the control system 400 of the molding machine controls the second driving source 600 to supply air to the support block that does not send a detection signal, that is, does not sense the belt layer 201. The support block that does not sense the belt layer 201 is driven to the lifting position H2, which is used to support the two side ends 203a at the head and tail joints of the tread layer 203.

[0088] Based on the tire building machine described above, an embodiment of the present invention further provides a tread assembly building method, comprising the following steps:

[0089] Step 1: The control system 400 controls the belt drum 100 to rotate around its own center line and sequentially adhere the belt layer 201, the cap layer 202, and the tread layer 203;

[0090] Step 2: According to the predetermined widths of the belt layer 201 and the tread layer 203, the control system 400 controls at least one group of movable support blocks to rise from the initial position H1 to the raised position H2, and the portions 203a on both sides of the end-to-end overlap of the tread layer 203 that extend beyond both sides of the belt layer are supported by the at least one group of raised support blocks;

[0091] Step 3: The control system 400 controls the laminating device 300 to roll the head and tail overlapping parts of the tread layer 203 .

[0092] Further, in step 2, the control system 400 controls at least one group of movable support blocks to rise from the initial position H1 to the lifting position H2 as follows:

[0093] The control system 40 controls the second driving source 600 to supply air to the at least one group of movable support blocks, and the movable support blocks are raised from the initial position H1 to the lifting position H2.

[0094] In another embodiment, the tread component forming method may further include the following steps:

[0095] Step 1: The control system 400 controls the belt drum 100 to rotate around its own center line to sequentially bond the belt layer 201 and the cap layer 202;

[0096] Step 2: According to the predetermined width of the belt layer 201, the control system 400 controls at least one group of movable support blocks to rise from the initial position H1 to the lifting position H2;

[0097] Step 3: The control system 400 controls the belt drum 100 to rotate around its own center line to fit the tread layer 203, at least one group of movable support blocks is located on the axial outer side of the belt layer 201 and the radial inner side of the two side ends 203 of the end-to-end joint of the tread layer 203, and at least one group of movable support blocks supports the parts 203a of the two sides of the end-to-end joint of the tread layer 203 that extend beyond the two sides of the belt layer;

[0098] Step 4: the control system 400 controls the laminating device 300 to roll the head and tail joints of the tread layer 203 .

[0099] Further, in step 2, the control system 400 controls at least one group of movable support blocks to rise from the initial position H1 to the lifting position H2 as follows:

[0100] The control system 40 controls the second driving source 600 to supply air to at least one group of movable support blocks, and at least one group of movable support blocks rises from the initial position H1 to the lifting position H2.

[0101] In another embodiment, the tread component forming method may further include the following steps:

[0102] Step 1: The control system 400 controls the belt drum 100 to rotate around its own center line to bond the belt layer 201;

[0103] Step 2: According to the predetermined width of the belt layer 201, the control system 400 controls at least one group of movable support blocks to rise from the initial position H1 to the lifting position H2;

[0104] Step 3: The control system 400 controls the belt drum 100 to rotate around its own center line to fit the tread layer 203, and the at least one group of support blocks is located on the axial outer side of the belt layer 201 and the radial inner side of both ends of the end-to-end joint of the tread layer 203, and the parts 203a on both sides of the end-to-end joint of the tread layer 203 that extend beyond both sides of the belt layer are supported by the at least one group of lifted support blocks;

[0105] Step 4: the control system 400 controls the laminating device 300 to roll the head and tail joints of the tread layer 203 .

[0106] Further, in step 2, the control system 400 controls at least one group of movable support blocks to rise from the initial position H1 to the lifting position H2 as follows:

[0107] The control system 40 controls the second driving source 600 to supply air to the at least one group of movable support blocks, and the movable support blocks are raised from the initial position H1 to the lifting position H2.

[0108] In another embodiment, the tread component forming method may further include the following steps:

[0109] Step 1: The control system 400 controls the belt drum 100 to rotate around its own center line to bond the belt layer 201 and the tread layer 203;

[0110] Step 2: According to the predetermined widths of the belt layer 201 and the tread layer 203, the control system 400 controls at least one group of movable support blocks to rise from the initial position H1 to the raised position H2, and the portions 203a on both sides of the head-to-tail overlap of the tread layer 203 that extend beyond both sides of the belt layer are supported by the at least one group of raised support blocks;

[0111] Step 3: The control system 400 controls the laminating device 300 to roll the head and tail joints of the tread layer 203 .

[0112] In another embodiment, the tread component forming method may further include the following steps:

[0113] Step 1: The control system 400 controls the belt drum 100 to rotate around its own center line to sequentially bond the belt layer 201 and the tread layer 203;

[0114] Step 2: The control system 400 controls at least one group of support blocks where the belt layer 201 is not detected to be raised from the initial position H1 to the raised position H2, and the portions 203a on both sides of the head-to-tail overlap of the tread layer 203 that extend beyond both sides of the belt layer are supported by the at least one group of raised support blocks;

[0115] Step 3: The control system 400 controls the laminating device 300 to roll the head and tail joints of the tread layer 203 .

[0116] In another embodiment, the tread component forming method may further include the following steps:

[0117] Step 1: The control system 400 controls the belt drum 100 to rotate around its own center line to bond the belt layer 201;

[0118] Step 2: the control system 400 controls at least one group of support blocks where the belt layer 201 is not detected to rise from the initial position H1 to the lifting position H2;

[0119] Step 3: The control system 400 controls the belt drum 100 to rotate around its own center line to adhere to the tread layer 203, and the parts 203a on both sides of the head-to-tail overlap of the tread layer 203 that extend beyond both sides of the belt layer 201 are supported by at least one set of lifted support blocks;

[0120] Step 4: the control system 400 controls the laminating device 300 to roll the head and tail joints of the tread layer 203 .

[0121] In summary, the present invention provides a belt drum, on which a drum tile is installed a support unit, and the support unit supports the part of the tread layer overlapped at both ends beyond the belt layer, so that the tread layer overlap is continuously and well supported in the width direction, which is beneficial to the overall pressing of the tread layer overlapped at both ends, and ensures the bonding quality of the tread layer overlapped at both ends, thereby obtaining a high-quality tread assembly. The present invention provides a tire forming machine including the above-mentioned belt drum and a tread assembly forming method based on the tire forming machine, so that the tire forming machine and the tread assembly forming method based on the tire forming machine can both obtain high-quality tread assemblies.

[0122] In the description of the specific implementation, the description of the discussion terms "in this embodiment", "in one embodiment", "in a specific embodiment" and the like means that the specific features or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. And in the specific implementation, the schematic description of the above terms does not necessarily refer to the same embodiment. Moreover, the specific features or points described can be combined in any one or more embodiments in a suitable manner.

[0123] Obviously, the above 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. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A belt drum for forming a tread assembly, wherein the tread assembly comprises a belt layer and a tread layer, wherein the belt drum can rotate to sequentially fit the belt layer and the tread layer, wherein the width of the tread layer is greater than the width of the belt layer, and wherein: The belt drum comprises: A drum shaft assembly, comprising a drum shaft located at the center of the belt drum; A drum shoe assembly is installed on the radially outer side of the drum shaft, and includes a plurality of drum shoes arranged along the circumferential direction, and the plurality of drum shoes can move radially relative to the drum shaft; A support unit is provided on one of the drum tiles, the support unit includes a plurality of groups of support blocks, each group of support blocks includes two support blocks symmetrically arranged along the central plane of the belt drum width, and at least one group of support blocks located axially outside the belt layer and radially inside the tread layer can be moved to a raised position to support the parts of the tread layer on both sides of the head-to-tail overlap beyond the two sides of the belt layer; The support unit further comprises a piston fixedly connected to the bottom of each support block and two connecting rods, the two connecting rods are located on both sides of the piston, and the drum shoe is provided with a receiving cavity for receiving the piston and a receiving cavity for receiving the connecting rod; The accommodating drum shoe is also provided with an air passage communicating with a plurality of accommodating cavities, and the supporting unit further includes an elastic reset member sleeved outside the connecting rod and accommodated in the accommodating cavity; The support blocks on the support unit that are covered by the belt layer are locked to the drum shoe, and the remaining support blocks on the support unit can move radially.

2. The belt drum according to claim 1, characterized in that: The drum shaft assembly also includes fixed plates arranged on both sides of the drum shaft, a plurality of fixed rods supporting and positioning the two fixed plates, and a moving part installed outside the drum shaft and capable of moving a certain distance along the axial direction of the drum shaft.

3. The belt drum according to claim 2, characterized in that: The drum shoe assembly also includes a plurality of brackets fixed on the radial inner side of the plurality of drum shoes, the movable member is connected to the plurality of brackets in an inclined sliding manner, and the two sides of the drum shoe assembly are connected to the two sides of the drum shaft assembly in a radial sliding manner.

4. The belt drum according to claim 1, characterized in that: A sensor for sensing the belt layer is arranged in the support block on the support unit.

5. A belt drum for forming a tread assembly, wherein the tread assembly comprises at least a belt layer and a tread layer, wherein the belt drum can rotate to sequentially fit the belt layer and the tread layer, wherein the width of the tread layer is greater than the width of the belt layer, and wherein: The belt drum comprises: A drum shaft assembly, comprising a drum shaft located at the center of the belt drum; A drum shoe assembly is installed on the radially outer side of the drum shaft, and includes a plurality of drum shoes arranged along the circumferential direction, and the plurality of drum shoes can move radially relative to the drum shaft; A first support unit and a second support unit are arranged on one of the drum tiles, the first support unit includes a plurality of first support blocks extending in the axial direction, the second support unit includes a plurality of second support blocks extending in the axial direction, the plurality of first support blocks or the plurality of second support blocks are symmetrically arranged along the central plane of the belt drum width, and at least two symmetrical first support blocks or the second support blocks located axially outside the belt layer and radially inside the tread layer can be moved to a raised position to support the portions of the tread layer on both sides of the head-to-tail overlap exceeding the two sides of the belt layer; The first support unit or the second support unit further comprises a piston fixedly connected to the bottom of each first support block or the second support block and two connecting rods, the two connecting rods are located on both sides of the piston, and the drum shoe is provided with a receiving cavity for receiving the piston and a receiving cavity for receiving the connecting rod; The accommodating drum shoe is also provided with an air passage communicating with a plurality of accommodating cavities, and the first supporting unit or the second supporting unit further includes an elastic reset member sleeved outside the connecting rod and accommodated in the accommodating cavity; The first supporting unit or the second supporting unit is provided with a sensor for sensing the belt layer.

6. A tire building machine, characterized in that: It comprises the belt drum as described in any one of claims 1 to 5, a first driving source for driving the belt drum to expand and contract, a second driving source for driving a support unit, a third driving source for driving the belt drum to rotate, a laminating device for laminating a tread layer, and a control system electrically connected to the first driving source, the second driving source, the third driving source and the laminating device, respectively.

7. A tread component molding method based on the tire molding machine according to claim 6, characterized in that: The method comprises the following steps: Step 1: The control system controls the belt drum to rotate around its own center line to fit the belt layer; Step 2: According to the predetermined widths of the belt layer and the tread layer, the control system controls at least one group of support blocks to rise from an initial position to a raised position; Step 3: The control system controls the belt drum to rotate around its own center line to fit the tread layer, and the parts of the tread layer on both sides of the head-to-tail overlap extending beyond the belt layer are supported by the at least one group of support blocks; Step 4: The control system controls the pressing device to roll the head and tail joints of the tread layer.

8. The method for forming a tread component according to claim 7, wherein: The control system controls at least one group of support blocks to rise from an initial position to a raised position, specifically comprising: The control system controls the second driving source to supply air to the at least one group of support blocks, and the support blocks rise from an initial position to a raised position.

9. A tread component molding method based on the tire molding machine according to claim 6, characterized in that: The method comprises the following steps: Step 1: The control system controls the belt drum to rotate around its own center line to sequentially attach the belt layer and the tread layer; Step 2: According to the predetermined widths of the belt layer and the tread layer, the control system controls at least one group of support blocks to rise from the initial position to the raised position, and the portions of the tread layer on both sides of the head-to-tail overlap extending beyond the belt layer are supported by the at least one group of support blocks; Step 3: The control system controls the pressing device to roll the head and tail joints of the tread layer.

Images