Secondary hair forming drum with adjustable radial size

Abstract

The invention relates to the technical field of tire forming drums, in particular to a secondary forming drum with an adjustable radial size, which comprises a main shaft, an expansion and contraction mechanism and a plurality of groups of drum tile assemblies, the expansion and contraction mechanism comprises an inner sliding seat, an outer sliding seat and a connecting rod, the main shaft is cylindrical, the inner sliding seat is assembled on the inner side of the main shaft in a sliding manner, and the outer sliding seat is assembled on the outer side of the main shaft in a sliding manner; the outer ring wall of the inner sliding base is provided with multiple sets of round keys arranged in a protruding mode, the multiple sets of round keys are arranged at intervals in the axial direction of the inner sliding base and used for corresponding to different radial expansion and contraction sizes, the main shaft is provided with sliding grooves in the axial direction, and the round keys penetrate through the sliding grooves, and the outer sliding base is provided with cutting grooves used for assembling the round keys. And the two ends of the connecting rod are rotationally assembled between the side, away from the main shaft, of the outer sliding seat and the drum tile assembly correspondingly, so that the compatibility of the forming drum to wheel blanks with similar specifications and different diameters is improved, the workload for redesigning and producing the forming drums with the similar specifications is reduced, and the production and manufacturing cost of tires is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tire building drums, in particular to a secondary tire building drum with adjustable radial dimensions. Background Art

[0002] With the continuous development of the global automotive industry and the growing demand for transportation, tires, as key components of vehicle contact with the ground, are expanding in sales and application. The performance of tires directly affects the driving safety, comfort and fuel economy of vehicles. Therefore, the market demand for tires shows a trend of diversification and segmentation. In such a market context, the tire manufacturing industry faces new challenges, namely, producing tires of various sizes that can meet the needs of different models and different usage scenarios.

[0003] The secondary forming drum is a forming equipment used in the tire manufacturing process. It is mainly used to perform preliminary forming of the semi-finished tire according to the designed shape of the tire. Through radial contraction movement, the semi-finished tires arranged in an orderly manner are propped up, and the forming of the tire blank is completed when the maximum expansion position is reached. The formed blank is then removed through contraction. The so-called "secondary method" refers to the second of the two main steps in tire forming, which includes the first forming: in this step, a primary forming drum is used to fit the cord layer, crown layer and other components on the forming drum to form a basic outline of the tire blank; the second forming: based on the first forming, the secondary forming drum is used to further correct the shape and adjust the size of the blank to make it more in line with the design requirements of the tire.

[0004] In the prior art, a Chinese invention patent with publication number CN105073396B discloses a forming drum, which is an expandable and contractible forming drum having a plurality of segments constituting a circumferential surface, wherein the forming drum has a plurality of swing arms with one end portion mounted on the outer circumferential surface of a cylindrical sliding member embedded in the drum shaft in a swingable manner and the other end portion mounted on the segment in a swingable manner, and the forming drum includes a plurality of segment expansion and contraction mechanisms arranged at intervals along the drum shaft and composed of the plurality of swing arms, and the forming drum is expanded and contracted by the plurality of segment expansion and contraction mechanisms as the sliding member moves in the direction of the drum shaft.

[0005] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: after the design and assembly of the forming drum, the length of the swing arm is fixed, resulting in a fixed expansion and contraction size of the forming drum. This results in the same forming drum being able to only adapt to the production of wheel blanks of one diameter. When processing wheel blanks of similar specifications but different diameters (such as common 16-inch, 17-inch, and 18-inch tires), it is necessary to correspondingly equip a variety of forming drums to meet production needs. This means that each forming drum of similar size needs to be redesigned and produced, which undoubtedly increases the production cost of the tire, resulting in a significant waste of human and material resources. Summary of the invention

[0006] In order to solve the technical problem of the special size of the secondary forming drum in the prior art, the present application provides a secondary forming drum with adjustable radial size.

[0007] The secondary forming drum with adjustable radial dimensions provided by the present invention adopts the following technical solution:

[0008] The cam is connected with the outer cover of the shaft to form a circle, and the outer cover is connected with the inner cover of the shaft to form a circle, and the outer cover is connected with the inner cover of the shaft to form a circle.

[0009] Preferably, the outer slide seat is arranged in a cylindrical shape, and a circular hole for sliding assembly with the main shaft is opened on the axis center of the outer slide seat, and the axis of the circular hole is arranged coaxially with the axis of the main shaft. The outer ring wall of the outer slide seat is provided with a U-shaped block along its radial protrusion, and the U-shaped block is connected with a rotating shaft and is used for rotating assembly of the connecting rod. The U-shaped blocks are arranged in multiple groups at equal angles along the center of the circular hole, and a plane portion is arranged between two adjacent groups of U-shaped blocks. The groove is arranged corresponding to the plane portion, and a connecting hole connected to the groove is opened on the plane portion. The connecting hole is used to screw the outer slide seat and the circular key.

[0010] Preferably, the drum tile assembly includes tiles, guide rails, and sliders, the tiles are mounted on the top walls of the guide rails, and the sliders are slidably mounted on the bottom walls of the sliders, and according to the shapes of the tiles, the drum tile assembly is divided into a narrow drum tile assembly and a wide drum tile assembly, and the drum tile assembly is arranged in an even array, and the narrow drum tile assembly and the wide drum tile assembly are arranged adjacent to each other in sequence, and the expansion and contraction mechanism includes two groups of outer slides, which are connected to the inner slides and are arranged at intervals along the axial direction of the inner slides, and the two groups of outer slides are respectively a first outer slide and a second outer slide, and the first outer slide is arranged close to one end of the main shaft, and the U-shaped block of the first outer slide and the U-shaped block of the second outer slide are arranged at an angle in the circumferential direction for assembling the narrow drum tile assembly and the wide drum tile assembly.

[0011] Preferably, the top wall of the guide rail has a protrusion with a T-shaped portion, the bottom wall of the drum tile has a T-shaped slot at its center, the T-shaped slot is slidably assembled with the T-shaped portion, the top wall of the T-shaped portion has a threaded hole, and the tile has a through hole for screw connection to the threaded hole.

[0012] Preferably, the tiles corresponding to the narrow drum tile assembly are narrow tiles, and the tiles corresponding to the wide drum tile assembly are wide tiles. The central angle of the arc length of the outermost circle of the narrow tile is equal to the central angle of the arc length of the outermost circle of the wide tile. The narrow tiles are provided with inwardly inclined portions on both sides close to the wide tiles, and the wide tiles are provided with outwardly inclined portions on both sides close to the narrow tiles. The inwardly inclined portions are matched with the outwardly inclined portions. When the forming drum is in an expanded state, the outwardly inclined portions are in surface contact with the inwardly inclined portions, and the outwardly inclined portions are located on the side of the inwardly inclined portions close to the main axis.

[0013] Preferably, the connecting rod includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the rotating shaft of the first outer sliding seat, the other end of the first connecting rod is hinged to the slider of the narrow drum tile assembly, an avoidance groove is opened in the middle of the guide rail of the narrow drum tile assembly, one end of the second connecting rod is hinged to the rotating shaft of the first outer sliding seat, the other end of the second connecting rod is hinged to the avoidance groove of the narrow drum tile assembly, the first connecting rod and the second connecting rod are hinged on the rotating shaft of the same group of U-shaped blocks, and the first connecting rod and the second connecting rod are arranged in a V shape, and the length of the first connecting rod is smaller than the length of the second connecting rod.

[0014] Preferably, the connecting rod also includes two groups of third connecting rods, and the wide drum tile assembly is provided with two groups of sliding blocks, and the two groups of sliding blocks are arranged at intervals along the guide rail of the wide drum tile assembly, one end of the third connecting rod of one group is hinged to the rotating shaft of the second outer sliding seat, and the other end of the third connecting rod is hinged to the sliding block of one group of the wide drum tile assembly, one end of the other group of the third connecting rod is hinged to the rotating shaft of the second outer sliding seat, and the other end of the third connecting rod is hinged to the sliding block of another group of the wide drum tile assembly, the two groups of the third connecting rods are hinged to the rotating shaft of the same group of U-shaped blocks, and the two groups of the third connecting rods are arranged in a V shape, and the length of the third connecting rod is less than the length of the first connecting rod.

[0015] Preferably, the expansion and contraction mechanism also includes a guide plate and a guide rod. The guide plate is coaxially arranged with the main shaft and connected to the main shaft. The guide plate is arranged on a side close to the slider. One end of the guide rod is slidably assembled with the guide plate. The guide rod slides radially along the guide plate. The other end of the guide rod is connected to the bottom of the guide rail of the drum shoe assembly. Multiple groups of guide rods are arranged corresponding to the drum shoe assembly.

[0016] Preferably, the multiple groups of circular keys are first-inch circular keys, second-inch circular keys, third-inch circular keys, and fixed-inch circular keys in sequence along the axial direction of the inner sliding seat. The fixed-inch circular keys are used to connect with the grooves of the second outer sliding seat. The first-inch circular keys, the second-inch circular keys and the third-inch circular keys correspond to different radial dimensions respectively. The circular keys and the inner sliding seat are designed to be split. The outer ring wall of the inner sliding seat is provided with a groove for assembling the circular keys. The end wall of the inner sliding seat is provided with a screw hole connected to the groove. The circular key is inserted in the groove. The screw hole is threadedly connected with a top screw for abutting the circular key against the inner wall of the groove.

[0017] Preferably, there are two groups of the expansion and contraction mechanism, and the two groups of the expansion and contraction mechanism are installed in a mirror-image manner along the center of the axis of the main shaft. A hinge shaft is arranged between the third connecting rod of the second outer slide seat of one group and the third connecting rod of the second outer slide seat of the other group, and the hinge shaft is located at the center of the two hinge points of the third connecting rod. When the forming drum is in the expanded state, the second outer slide seat of one group of the expansion and contraction mechanism contacts with the second outer slide seat of the other group of the expansion and contraction mechanism.

[0018] The beneficial effects of the present invention are:

[0019] By providing an inner slide seat and an outer slide seat, and providing a first outer slide seat for matching different radial sizes on the inner slide seat, when it is necessary to adjust and switch different radial sizes to meet the production of different sizes, the circular keys of the outer slide seat and the inner slide seat are disassembled by unscrewing the screws, and then the outer slide seat is pushed to slide along the axial direction of the main shaft, so that the outer slide seat is assembled from one set of grooves corresponding to the circular keys of the inner slide seat, and moved to another set of grooves of the outer slide seat and assembled with another set of circular keys of the inner slide seat, and then locked by screws, thereby completing the adjustment of the expansion and contraction size of the drum shoe assembly, improving the compatibility of the forming drum with different diameter wheel blanks of similar specifications, reducing the workload of redesigning and producing each forming drum of similar size, reducing human and material resources, and reducing the production cost of tires.

[0020] By providing a guide plate and a connecting rod, the radial movement of the drum shoe assembly along the main shaft is limited, and the expansion and contraction accuracy of the drum shoe assembly is improved. The guide plate is arranged on the side close to the slider, and multiple groups of guide rods are arranged corresponding to the drum shoe assembly, so that the guide rods and the sliders are arranged correspondingly. The guide rods can limit the slider sliding to one end of the guide rail to prevent the slider from slipping off the guide rail, thereby improving the reliability and stability of the sliding of the slide rail and ensuring the normal expansion and contraction of the drum shoe assembly.

[0021] By providing a narrow drum tile assembly and a wide drum tile assembly, the drum tile assembly is arranged in an even array, and the narrow drum tile assembly and the wide drum tile assembly are arranged adjacent to each other in sequence to avoid interference between the two adjacent groups of drum tile assemblies when the drum tile assembly shrinks, thereby ensuring the normal expansion and contraction of the drum tile assembly. The top wall of the guide rail has a protrusion with a T-shaped portion, and the bottom wall of the drum tile and a T-shaped groove are provided at the center. The T-shaped groove is slidably assembled with the T-shaped portion, and the top wall of the T-shaped portion is provided with a threaded hole, and the tile is provided with a through hole for connecting with the threaded hole screw. The detachable design of the tile can reduce the weight of pushing the outer slide seat to slide to a certain extent, which is convenient for the operator to adjust the radial size of the forming drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an 18-inch expanded stereogram in the embodiment of the present application;

[0023] Figure 2 This is the 18-inch collapsed front view in the embodiment of the present application;

[0024] Figure 3 It is an 18-inch expanded cutaway stereogram in the embodiment of the present application;

[0025] Figure 4 It is a 16-inch expanded cutaway stereogram in the embodiment of the present application;

[0026] Figure 5 It is a left view of the wide drum shoe assembly in an embodiment of the present application;

[0027] Figure 6 is a cutaway perspective view of a wide drum shoe assembly in an embodiment of the present application;

[0028] Figure 7 It is a left view of a narrow drum shoe assembly in an embodiment of the present application;

[0029] Figure 8 It is a partial exploded view of the narrow drum shoe assembly in the embodiment of the present application;

[0030] Fig. 9 It is a partial stereogram in the embodiment of the present application;

[0031] Fig.10 yes Fig. 9 Left view in;

[0032] Fig.11 yes Fig.10 Schematic diagram of the contraction state in;

[0033] Fig.12 It is a schematic diagram of the assembly of the inner slide and the outer slide in the embodiment of the present application;

[0034] Fig.13 is a three-dimensional diagram of the inner slide seat in the embodiment of the present application;

[0035] Fig.14 It is a front view of the inner slide seat in the embodiment of the present application.

[0036] Description of reference numerals:

[0037] 1. Spindle; 101. Slide; 2. Expansion and contraction mechanism; 201. Inner slide; 202. Outer slide; 2021. First outer slide; 2022. Second outer slide; 203. Connecting rod; 2031. First connecting rod; 2032. Second connecting rod; 2033. Third connecting rod; 204. Round key; 2041. First inch round key; 2042. Second inch round key; 2043. Third inch round key; 2044. Fixed inch round key; 205. Groove; 206. Round hole; 207. U-shaped block; 210. Plane portion; 211. Screw hole; 212, connecting hole; 213, guide plate; 2131, guide groove; 214, guide rod; 215, hinge shaft; 3, drum tile assembly; 301, tile; 3011, first-level tile; 3012, second-level tile; 3013, third-level tile; 3015, step part 2; 302, guide rail; 303, slider; 304, T-slot; 305, T-shaped part; 4, narrow drum tile assembly; 401, narrow tile; 4011, inward-inclined part; 402, avoidance groove; 5, wide drum tile assembly; 501, wide tile; 5011, outward-inclined part. DETAILED DESCRIPTION

[0038] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that each technical feature and the overall technical solution of the present application can be understood intuitively and vividly, but it cannot be understood as a limitation on the scope of protection of the present application.

[0039] In the description of this application, if there is a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When a feature is referred to as "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0040] In the description of this application, if "several" is involved, it means one or more, if "multiple" is involved, it means more than two, if "greater than", "less than", "exceed", they should be understood as not including the number, if "above", "below", "within" are involved, they should be understood as including the number. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In addition, unless otherwise defined, the technical terms and scientific terms used in this application are the same as those generally understood by those skilled in the art. The terms used in this application are only for describing specific embodiments, not for limiting this application. It should be understood that when used in this specification and the appended claims, the terms "include" and "comprise" indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0042] Example: Figure 1-14As shown, a secondary forming drum with adjustable radial size includes a main shaft 1, an expansion and contraction mechanism 2, and multiple groups of drum shoe assemblies 3. The drum shoe assemblies 3 are connected to the outer side of the expansion and contraction mechanism 2. The expansion and contraction mechanism 2 is slidably assembled with the main shaft 1 and is used to push the drum shoe assembly 3 to move back and forth along the radial direction of the main shaft 1. The expansion and contraction mechanism 2 includes an inner slide seat 201, an outer slide seat 202, and a connecting rod 203. The inner slide seat 201 is connected to the push rod of the forming machine. The main shaft 1 is cylindrically arranged. The inner slide seat 201 is slidably assembled on the inner side of the main shaft 1 and slides along the axial direction of the main shaft 1. The outer slide seat 202 is slidably assembled On the outside of the main shaft 1 and sliding along the axial direction of the main shaft 1, the outer ring wall of the inner slide seat 201 has a protruding round key 204, and the round key 204 is arranged in multiple groups along the axial interval of the inner slide seat 201 and is used to correspond to different radial expansion and contraction sizes. The main shaft 1 is provided with a slide groove 101 for the round key 204 to pass through along the axial direction, and the slide groove 101 is provided with multiple groups corresponding to the round key 204. The outer slide seat 202 is provided with a groove 205 for assembling the round key 204, and the groove 205 is provided with multiple groups corresponding to the round key 204. The round key 204 is passed from the inner slide seat 201 to the slide groove 101 is located in the slot 205, and the outer slide 202 is connected to the round key 204 by screws, so that the force of the inner slide 201 sliding along the axial direction of the main shaft 1 is transmitted, and then the inner slide 201 is pushed to slide along the axial direction of the main shaft 1. When it is necessary to adjust and switch different radial dimensions to meet the production of different sizes, the round keys 204 of the outer slide 202 and the inner slide 201 are disassembled by unscrewing the screws, and then the outer slide 202 is pushed to slide along the axial direction of the main shaft 1, so that the outer slide 202 is separated from a set of slots 205 and the inner slide 201. 1 is assembled correspondingly, moved to another set of grooves 205 of the outer slide 202 and assembled correspondingly with another set of round keys 204 of the inner slide 201, and then locked by screws, so as to complete the adjustment of the expansion and contraction size of the drum shoe assembly 3, and the two ends of the connecting rod 203 are respectively rotated and assembled between the side of the outer slide 202 away from the main shaft 1 and the drum shoe assembly 3. The connecting rod 203 is used to convert the axial movement of the outer slide 202 along the main shaft 1 into the radial movement of the main shaft 1. Multiple groups of connecting rods 203 are arranged corresponding to the drum shoe assembly 3, which are respectively used to transmit multiple groups of drum shoe assemblies 3.

[0043] In terms of the specific structure of the outer slide 202, the outer slide 202 is set in a cylindrical shape, and the axis of the outer slide 202 is provided with a circular hole 206 for sliding assembly with the main shaft 1. The axis of the circular hole 206 is coaxially arranged with the axis of the main shaft 1. The outer ring wall of the outer slide 202 is provided with a U-shaped block 207 along its radial protrusion. The U-shaped block 207 is connected to a rotating shaft and is used for rotating assembly of the connecting rod 203. Multiple groups of U-shaped blocks 207 are arranged at equal angles along the center of the circular hole 206. A plane portion 210 is provided between two adjacent groups of U-shaped blocks 207. The groove 205 is provided corresponding to the plane portion 210. The plane portion 210 is provided with a connecting hole 207 that connects the groove 205. 12. The connecting hole 212 is used to screw the outer slide seat 202 and the round key 204. The round key 204 is provided with a screw hole 211 for screw connection. In the present embodiment, six groups of U-shaped blocks 207 are provided. By providing the U-shaped blocks 207, the stability of the rotational assembly of the connecting rod 203 and the outer slide seat 202 is improved, and the smoothness and stability of the expansion and contraction of the drum shoe assembly 3 are improved. By providing the planar portion 210 and the connecting hole 212, when adjusting the expansion and contraction size of the drum shoe assembly 3, it is convenient to match and combine different grooves 205 on the outer slide seat 202 with different round keys 204 on the inner slide seat 201, thereby improving the efficiency of adjusting the radial size.

[0044] In order to avoid that the two adjacent groups of drum tile assemblies 3 interfere with each other when the drum tile assembly 3 is contracted, resulting in the inability to contract, therefore, in the prior art, different shapes of wide and narrow tiles 301 are used, that is, the arc length center angle of the outermost circle of the wide and narrow tiles 301 is the same, but the arc length center angle of the innermost circle of the wide tile 501 is greater than the arc length center angle of the innermost circle of the narrow tile 401, so that when contracted, the radial movement distances thereof are different to avoid interference. Therefore, in order to drive the two different groups of drum tiles Component 3, needs to use two sets of outer slide seats 202. Drum tile component 3 includes tile 301, guide rail 302, slider 303, tile 301 is assembled on the top wall of guide rail 302, slider 303 is slidably assembled on the bottom wall of slider 303, according to the different shapes of tile 301, drum tile component 3 is divided into narrow drum tile component 4 and wide drum tile component 5, drum tile component 3 is arranged in an even array, narrow drum tile component 4 and wide drum tile component 5 are arranged adjacent to each other in sequence, expansion and contraction mechanism 2 includes two sets of outer slide seats 202, The outer slide 202 is connected to the inner slide 201 and arranged at intervals along the axial direction of the inner slide 201. The two groups of outer slides 202 are respectively a first outer slide 2021 and a second outer slide 2022. The first outer slide 2021 is arranged close to one end of the main shaft 1. The U-shaped block 207 of the first outer slide 2021 and the U-shaped block 207 of the second outer slide 2022 are arranged at an angle in the circumferential direction, and are used to assemble the narrow drum shoe assembly 4 and the wide drum shoe assembly 5. By using the first outer slide 202 1 and the second outer slide 2022 are arranged along the axial direction of the main shaft 1, and push the narrow drum tile assembly 4 and the wide drum tile assembly 5 respectively. Since the tiles 301 of the narrow drum tile assembly 4 and the wide drum tile assembly 5 are of different sizes, and the U-shaped block 207 of the first outer slide 2021 and the U-shaped block 207 of the second outer slide 2022 are staggered, the radial movement distances of the narrow drum tile assembly 4 and the wide drum tile assembly 5 are different, thereby avoiding the risk of interference between two adjacent groups of drum tile assemblies 3 during contraction.

[0045] In this embodiment, there are 12 groups of drum shoe assemblies 3, 6 groups of narrow drum shoe assemblies 4 and wide drum shoe assemblies 5, and the U-shaped block 207 of the first outer slide seat 2021 and the U-shaped block 207 of the second outer slide seat 2022 are arranged at an angle of 30° in the circumferential direction.

[0046] When the radial size of the forming drum is adjusted from a large size to a small size, for example, from 18 inches to 16 inches, the radial contraction will cause interference between the tiles 301. In order to solve the above technical problems, the tile 301 can be designed to correspond to the size of the small-sized forming drum, that is, 16 inches, so as to solve the problem of interference of the tile 301. However, when the adjustment from 16 inches to 18 inches is switched, when the forming drum is in the expanded state, there will be gaps between different groups of drum tile assemblies 3, resulting in a lack of support for the tire, thereby affecting the molding quality of the tire to a certain extent. In order to improve the processing quality of the tire, this example adopts a solution of disassembling the tile 301, that is, 16 inches, 1 There are tiles 301 of corresponding sizes for both 7-inch and 18-inch sizes, so as to eliminate the gap between the tiles 301 when the radial size of the forming drum is adjusted. Therefore, in order to improve the assembly accuracy of the tiles 301 and the guide rail 302, the top wall of the guide rail 302 has a protrusion with a T-shaped portion 305, and the bottom wall of the drum tile and the center thereof are provided with a T-shaped slot 304. The T-shaped slot 304 and the T-shaped portion 305 are slidably assembled, and the top wall of the T-shaped portion 305 is provided with a threaded hole, and the tile 301 is provided with a through hole for connecting with the threaded hole screw. The detachable design of the tile 301 can reduce the weight of the outer slide seat 202 to a certain extent, which is convenient for the operator to adjust the radial size of the forming drum.

[0047] Furthermore, in order to improve the replacement efficiency of the tile 301 and reduce the processing difficulty of the tile 301, the tile 301 includes a first-level tile 3011, a second-level tile 3012, and a third-level tile 3013. The second-level tile 3012 is provided with a through hole, and is threadedly connected to the guide rail 302 by inserting screws. The second-level tile 3012 is located between the first-level tile 3011 and the third-level tile 3013. The second-level tile 3012 is provided with a step portion on both sides close to the first-level tile 3011 and the third-level tile 3013.

[0048] 3015, so that the cross-section of the secondary tile 3012 is convex, and the first tile 3011 is provided with a step portion 1 on the side close to the secondary tile 3012, and the step portion 1 is matched with the step portion 2 3015, and when assembled, the step portion 1 is located above the step portion 2 3015; the tertiary tile 3013 is provided with a step portion 3 on the side close to the secondary tile 3012, and the step portion 3 is matched with the step portion 2 3015, and when assembled, the step portion 3 is located above the step portion 2 3015, under the limitation of the T-shaped portion 305 and the T-shaped groove 304, plus the surface contact between the step portion 2 3015 and the step portion 1, and the surface contact between the step portion 3 and the step portion 1, the assembly of the first tile 3011 and the tertiary tile 3013 is completed, and through holes corresponding to the step portion 2 3015 are opened on the top walls of the step portion 1 and the step portion 3, thereby reducing the installation of screws and improving the disassembly and assembly efficiency of the tile 301.

[0049] In terms of the structural design of the tiles 301 of the narrow drum tile assembly 4 and the wide drum tile assembly 5, the tiles 301 corresponding to the narrow drum tile assembly 4 are called narrow tiles 401, and the tiles 301 corresponding to the wide drum tile assembly 5 are called wide tiles 501. The arc length center angle of the outermost circle of the narrow tile 401 is equal to the arc length center angle of the outermost circle of the wide tile 501. The narrow tile 401 is provided with inwardly inclined portions 4011 on both sides close to the wide tile 501, so that the arc length center angle of the narrow tile 401 gradually decreases from the outside to the inside, and the wide tile 501 is provided with outwardly inclined portions 5011 on both sides close to the narrow tile 401, so that the arc length center angle of the wide tile 501 increases from the outside to the inside. It gradually becomes larger, and the inwardly inclined portion 4011 and the outwardly inclined portion 5011 are adapted to be arranged. When the forming drum is in an expanded state, the outwardly inclined portion 5011 contacts the inwardly inclined portion 4011, and the outwardly inclined portion 5011 is located on the side of the inwardly inclined portion 4011 close to the main shaft 1. By structurally designing the narrow tile 401 and the wide tile 501, and through the first outer slide 2021 and the second outer slide 2022, the wide drum tile assembly 5 and the narrow drum tile assembly 4 are respectively pushed to expand and contract, thereby realizing differential pushing. When the forming drum is in a contracted state, the wide drum tile assembly 5 is located on the side of the narrow drum tile assembly 4 close to the main shaft 1, thereby avoiding interference between two adjacent groups of drum tile assemblies 3.

[0050] In terms of the specific structure of the assembly of the first outer slide 2021 and the narrow drum tile assembly 4, the connecting rod 203 includes a first connecting rod 2031 and a second connecting rod 2032. One end of the first connecting rod 2031 is hinged to the rotating shaft of the first outer slide 2021, and the other end of the first connecting rod 2031 is hinged to the slider 303 of the narrow drum tile assembly 4. An avoidance groove 402 is provided in the middle of the guide rail 302 of the narrow drum tile assembly 4, and one end of the second connecting rod 2032 is hinged to the rotating shaft of the first outer slide 2021, and the other end of the second connecting rod 2032 is hinged to the slider 303 of the narrow drum tile assembly 4. The avoidance groove 402 of the shoe assembly 4 is hinged, the first connecting rod 2031 and the second connecting rod 2032 are hinged on the rotating shaft of the same group of U-shaped blocks 207, and the first connecting rod 2031 and the second connecting rod 2032 are arranged in a V shape, and the length of the first connecting rod 2031 is smaller than the length of the second connecting rod 2032. During the sliding process of the first outer sliding seat 2021, the first connecting rod 2031 rotates while pushing the slider 303 to slide along the bottom wall of the slide rail, and the second connecting rod 2032 rotates with the bottom wall of the slide rail, thereby completing the expansion and contraction of the narrow drum shoe assembly 4.

[0051] In this embodiment, the length of the guide rail 302 is 250 mm, the straight-line distance between the two hinge points of the first connecting rod 2031 is 93 mm, and the straight-line distance between the two hinge points of the second connecting rod 2032 is 127 mm. When the drum shoe assembly 3 is in a retracted state, the slide rail is located at one end of the guide rail 302. At this time, the straight-line distance between the hinge point between the first connecting rod 2031 and the slider 303 and the hinge point between the second connecting rod 2032 and the guide rail 302 is 150 mm.

[0052] In terms of the specific structure of the assembly of the second outer slide 2022 and the wide drum tile assembly 5, the connecting rod 203 also includes two groups of third connecting rods 2033. The wide drum tile assembly 5 is provided with two groups of sliders 303. The two groups of sliders 303 are arranged at intervals along the guide rail 302 of the wide drum tile assembly 5. One end of one group of third connecting rods 2033 is hinged to the rotating shaft of the second outer slide 2022, and the other end of the third connecting rod 2033 is hinged to the slider 303 of one group of wide drum tile assembly 5. One end of the other group of third connecting rods 2033 is hinged to the second outer slide 2022. 022 is hinged on the rotating shaft, and the other end of the third connecting rod 2033 is hinged to the slider 303 of another group of wide drum shoe assembly 5. The two groups of third connecting rods 2033 are hinged on the rotating shaft of the same group of U-shaped blocks 207, and the two groups of third connecting rods 2033 are arranged in a V shape. The length of the third connecting rod 2033 is less than the length of the first connecting rod 2031. During the sliding process of the second outer sliding seat 2022, the two groups of third connecting rods 2033 rotate and push the slider 303 to slide along the bottom wall of the slide rail, thereby completing the expansion and contraction of the wide drum shoe assembly 5.

[0053] In this embodiment, the length of the guide rail 302 is 250 mm, and the straight-line distance between the two hinge points of the third connecting rod 2033 is 85 mm. When the drum shoe assembly 3 is in a retracted state, one set of slide rails is located at one end of the guide rail 302. At this time, the straight-line distance between the hinge point of one set of third connecting rods 2033 and one set of sliders 303 and the hinge point of another set of second connecting rods 2032 and another set of sliders 303 is 148 mm.

[0054] In order to limit the freedom of movement of the drum-tile assembly 3 so that the drum-tile assembly 3 can move along the radial direction of the main shaft 1, the expansion and contraction mechanism 2 also includes a guide plate 213 and a guide rod 214. The guide plate 213 is coaxially arranged with the main shaft 1 and connected to the main shaft 1. The guide plate 213 is arranged on a side close to the slider 303. The guide plate 213 is provided with a guide groove 2131 for slidingly assembling with the guide rod 214 on its outer ring wall and along its radial direction. One end of the guide rod 214 is slidably assembled with the guide plate 213, and the guide rod 214 slides along the radial direction of the guide plate 213. The other end of the guide rod 214 is connected to the bottom of the guide rail 302 of the drum-tile assembly 3. A plurality of guide rods 214 are arranged corresponding to the drum-tile assembly 3. The plurality of guide rods 214 are arranged at equal angles along the axis of the main shaft 1. By It is arranged on a side close to the slider 303, that is, close to one end of the main shaft 1, the guide plate 213 is located on one side of the first outer slide 2021, and the second outer slide 2022 is located on the other side of the first outer slide 2021, so as to avoid the guide plate 213 being arranged in the middle of the main shaft 1 to interfere with the swing of the second connecting rod 2032, thereby ensuring the normal expansion and contraction of the drum shoe assembly 3. At the same time, the guide plate 213 is arranged on a side close to the slider 303, and multiple groups of guide rods 214 are arranged corresponding to the drum shoe assembly 3, so that the guide rods 214 are arranged corresponding to the slider 303, and the guide rods 214 can limit the slider 303 sliding to one end of the guide rail 302, thereby preventing the slider 303 from slipping off the guide rail 302, thereby improving the reliability and stability of the slide rail sliding, and ensuring the normal expansion and contraction of the drum shoe assembly 3.

[0055] On the assembly structure of the round key 204 and the inner slide seat 201, the round key 204 is provided with multiple groups, and the multiple groups of round keys 204 are sequentially arranged along the axial direction of the inner slide seat 201 as the first inch round key 2041, the second inch round key 2042, the third inch round key 2043, and the fixed inch round key 2044. The fixed inch round key 2044 is used to connect with the groove 205 of the second outer slide seat 2022. The first inch round key 2041, the second inch round key 2042 and the third inch round key 2043 correspond to different radial dimensions respectively. When the radial dimension of the forming drum needs to be adjusted, the first outer slide seat 2021 is moved along the axial direction of the inner slide seat 201 by sliding, so that different groups of the first outer slide seat 2021 are adjusted. The cutting groove 205 is respectively connected to the first-inch round key 2041, the second-inch round key 2042 and the third-inch round key 2043, so as to complete the adjustment of the radial size of the forming drum. The round key 204 and the inner slide seat 201 are designed in a split manner. The outer ring wall of the inner slide seat 201 is provided with a groove for assembling the round key 204. The end wall of the inner slide seat 201 is provided with a screw hole 211 connected to the groove. The round key 204 is inserted into the groove. The screw hole 211 is threadedly connected with a top screw for abutting the round key 204 against the inner wall of the groove. The split design of the round key 204 reduces the processing difficulty of the inner slide seat 201, and it is convenient to insert the round key 204 into the cutting groove 205, so as to facilitate the assembly of the forming drum.

[0056] In terms of the specific structural design of the first-inch-level circular key 2041, the second-inch-level circular key 2042, the third-inch-level circular key 2043, and the fixed-inch circular key 2044, multiple groups of fixed-inch circular keys 2044 are arranged at an angle a along the center of the inner slide seat 201, the spacing angle between the second-inch-level circular key 2042 and the first-inch-level circular key 2041 is X times of a / 2, X is an integer, the spacing angle between the third-inch-level circular key 2043 and the second-inch-level circular key 2042 is Y times of a / 2, Y is an integer, the angle between the first-inch-level circular key 2041 and the third-inch-level circular key 2043 is less than or equal to 180°, and the angle a is equal to 360° divided by the number of drum shoe assemblies 3.

[0057] In this embodiment, the angle a is 60°, the first inch level represents the round key 204 corresponding to 16 inches, the second inch level represents the round key 204 corresponding to 17 inches, the third inch level represents the round key 204 corresponding to 18 inches, the interval angle between the second inch level round key 2042 and the first inch level round key 2041 is 120°, the interval angle between the third inch level round key 2043 and the second inch level round key 2042 is 60°, the angle between the first inch level round key 2041 and the third inch level round key 2043 is less than or equal to 180°, the center distance between the second inch level round key 2042 and the first inch level round key 2041 is 5.94 mm, and the third inch level round key 2043 is 120°. The center distance between the circular key 2043 and the second-inch circular key 2042 is 6.3 mm, so that the first-inch circular key 2041, the second-inch circular key 2042, and the third-inch circular key 2043 are arranged in the same semicircle, which is convenient for the adjustment of the first outer sliding seat 2021. Of course, the first-inch circular key 2041, the second-inch circular key 2042, and the third-inch circular key 2043 are all arranged upward. By staggering the first-inch circular key 2041, the second-inch circular key 2042, and the third-inch circular key 2043, the risk of pressure concentration caused by multiple sets of grooves in the same axial direction of the inner sliding seat 201, which affects the rigidity of the inner sliding seat 201, is reduced.

[0058] In order to improve the expansion and contraction stability of the drum and tile assembly 3, two groups of expansion and contraction mechanisms 2 are provided. The two groups of expansion and contraction mechanisms 2 are installed in a mirror-image manner along the center of the axis of the main shaft 1. A hinge shaft 215 is provided between the third connecting rod 2033 of one group of second outer slides 2022 and the third connecting rod 2033 of the other group of second outer slides 2022. The hinge shaft 215 is located at the center of the two hinge points of the third connecting rod 2033. When the forming drum is in an expanded state, the second outer slide 2022 of one group of expansion and contraction mechanisms 2 contacts the second outer slide 2022 of the other group of expansion and contraction mechanisms 2. By providing two groups of expansion and contraction mechanisms 2 in a mirror-image manner, the drum and tile assembly 3 is driven to expand and contract, thereby improving the force uniformity of the drum and tile assembly 3 and improving the expansion and contraction stability of the drum and tile assembly 3, thereby ensuring the processing quality of the tire.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A secondary forming drum with adjustable radial dimensions, comprising a main shaft, an expansion and contraction mechanism, and a plurality of drum shoe assemblies, wherein the drum shoe assemblies are connected to the outer sides of the expansion and contraction mechanism, and the expansion and contraction mechanism is slidably assembled with the main shaft and used to push the drum shoe assemblies to move back and forth along the radial direction of the main shaft, characterized in that: The expansion and contraction mechanism includes an inner slide seat, an outer slide seat, and a connecting rod. The main shaft is cylindrically arranged. The inner slide seat is slidably assembled on the inner side of the main shaft, and the outer slide seat is slidably assembled on the outer side of the main shaft. The outer ring wall of the inner slide seat has a protruding circular key. The circular keys are arranged in multiple groups at intervals along the axial direction of the inner slide seat and are used to correspond to different radial expansion and contraction sizes. The main shaft is provided with a slide groove for the circular key to pass through along the axial direction, and the outer slide seat is provided with a cutting groove for assembling the circular key. The two ends of the connecting rod are respectively rotatably assembled between the side of the outer slide seat away from the main shaft and the drum shoe assembly.

2. A secondary forming drum with adjustable radial dimensions according to claim 1, characterized in that: The outer slide seat is arranged in a cylindrical shape, and a circular hole for sliding assembly with the main shaft is opened at the axis center of the outer slide seat, and the axis of the circular hole is arranged coaxially with the axis of the main shaft. A U-shaped block is arranged along the radial protrusion of the outer ring wall of the outer slide seat, and the U-shaped block is connected with a rotating shaft and is used for rotating assembly of the connecting rod. The U-shaped blocks are arranged in multiple groups at equal angles along the center of the circular hole, and a plane portion is arranged between two adjacent groups of U-shaped blocks. The groove is arranged corresponding to the plane portion, and a connecting hole connected to the groove is opened on the plane portion. The connecting hole is used to screw the outer slide seat and the circular key.

3. A secondary forming drum with adjustable radial dimensions according to claim 2, characterized in that: The drum tile assembly includes tiles, guide rails, and sliders. The tiles are mounted on the top walls of the guide rails, and the sliders are slidably mounted on the bottom walls of the sliders. According to the shapes of the tiles, the drum tile assembly is divided into a narrow drum tile assembly and a wide drum tile assembly. The drum tile assembly is arranged in an even array, and the narrow drum tile assembly and the wide drum tile assembly are arranged adjacent to each other in sequence. The expansion and contraction mechanism includes two groups of outer slides, which are connected to the inner slides and are arranged at intervals along the axial direction of the inner slides. The two groups of outer slides are respectively a first outer slide and a second outer slide. The first outer slide is arranged close to one end of the main shaft, and the U-shaped block of the first outer slide and the U-shaped block of the second outer slide are arranged at an angle in the circumferential direction for assembling the narrow drum tile assembly and the wide drum tile assembly.

4. A secondary forming drum with adjustable radial dimensions according to claim 3, characterized in that: The top wall of the guide rail has a protruding T-shaped portion, the bottom wall of the drum tile has a T-shaped slot at its center, the T-shaped slot is slidably assembled with the T-shaped portion, the top wall of the T-shaped portion has a threaded hole, and the tile has a through hole for screw connection with the threaded hole.

5. A secondary forming drum with adjustable radial dimensions according to claim 4, characterized in that: The tiles corresponding to the narrow drum tile assembly are narrow tiles, and the tiles corresponding to the wide drum tile assembly are wide tiles. The arc length center angle of the outermost circle of the narrow tile is equal to the arc length center angle of the outermost circle of the wide tile. The narrow tile is provided with inwardly inclined portions on both sides close to the wide tile, and the wide tile is provided with outwardly inclined portions on both sides close to the narrow tile. The inwardly inclined portions are matched with the outwardly inclined portions. When the forming drum is in an expanded state, the outwardly inclined portions are in surface contact with the inwardly inclined portions, and the outwardly inclined portions are located on the side of the inwardly inclined portions close to the main axis.

6. A secondary forming drum with adjustable radial dimensions according to claim 5, characterized in that: The connecting rod includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the rotating shaft of the first outer sliding seat, the other end of the first connecting rod is hinged to the slider of the narrow drum shoe assembly, an avoidance groove is opened in the middle of the guide rail of the narrow drum shoe assembly, one end of the second connecting rod is hinged to the rotating shaft of the first outer sliding seat, the other end of the second connecting rod is hinged to the avoidance groove of the narrow drum shoe assembly, the first connecting rod and the second connecting rod are hinged on the rotating shaft of the same group of U-shaped blocks, and the first connecting rod and the second connecting rod are arranged in a V shape, and the length of the first connecting rod is smaller than the length of the second connecting rod.

7. A secondary forming drum with adjustable radial dimensions according to claim 6, characterized in that: The connecting rod also includes two groups of third connecting rods, and the wide drum tile assembly is provided with two groups of sliding blocks, and the two groups of sliding blocks are arranged at intervals along the guide rail of the wide drum tile assembly. One end of the third connecting rod of one group is hinged to the rotating shaft of the second outer sliding seat, and the other end of the third connecting rod is hinged to the sliding block of one group of the wide drum tile assembly, and one end of the other group of the third connecting rod is hinged to the rotating shaft of the second outer sliding seat, and the other end of the third connecting rod is hinged to the sliding block of another group of the wide drum tile assembly. The two groups of the third connecting rods are hinged to the rotating shaft of the same group of U-shaped blocks, and the two groups of the third connecting rods are arranged in a V shape, and the length of the third connecting rod is less than the length of the first connecting rod.

8. The secondary forming drum with adjustable radial dimensions according to claim 3, characterized in that: The expansion and contraction mechanism also includes a guide plate and a guide rod. The guide plate is coaxially arranged with the main shaft and connected to the main shaft. The guide plate is arranged on a side close to the slider. One end of the guide rod is slidably assembled with the guide plate. The guide rod slides radially along the guide plate. The other end of the guide rod is connected to the bottom of the guide rail of the drum shoe assembly. Multiple groups of guide rods are arranged corresponding to the drum shoe assembly.

9. The secondary forming drum with adjustable radial dimensions according to claim 1, characterized in that: The multiple groups of circular keys are arranged along the axial direction of the inner sliding seat in sequence of first-inch circular keys, second-inch circular keys, third-inch circular keys, and fixed-inch circular keys. The fixed-inch circular keys are used to connect with the cut grooves of the second outer sliding seat. The first-inch circular keys, the second-inch circular keys and the third-inch circular keys correspond to different radial dimensions respectively. The circular keys and the inner sliding seat are designed to be split. The outer ring wall of the inner sliding seat is provided with a groove for assembling the circular keys. The end wall of the inner sliding seat is provided with a screw hole connected to the groove. The circular key is inserted in the groove. The screw hole is threadedly connected with a top screw for abutting the circular key against the inner wall of the groove.

10. The secondary forming drum with adjustable radial dimensions according to claim 8, characterized in that: The expansion and contraction mechanism is provided with two groups, and the two groups of the expansion and contraction mechanism are installed in a mirror-image manner along the center of the axis of the main shaft. A hinge shaft is provided between the third connecting rod of the second outer slide seat of one group and the third connecting rod of the second outer slide seat of the other group, and the hinge shaft is located at the center of the two hinge points of the third connecting rod. When the forming drum is in the expanded state, the second outer slide seat of one group of the expansion and contraction mechanism contacts with the second outer slide seat of the other group of the expansion and contraction mechanism.

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