Expansion shaping drum capable of converting axial motion into radial motion

Abstract

The invention relates to the technical field of shaping drums for tire production, in particular to a collapsible shaping drum capable of converting axial motion into radial motion, which comprises a drum seat, an end cover, an inner barrel, a piston, an outer barrel, a connecting rod and drum tiles, the drum tiles are slidably assembled between the end cover and the drum seat, and the drum tiles are arranged along the axis of the drum seat at equal angle intervals. The two ends of the connecting rods are rotationally assembled with the drum tiles and the outer ring wall of the outer cylinder body respectively, the connecting rods correspond to the drum tiles, one side wall of each drum tile is connected with a synchronous part, the other side wall of each drum tile is provided with a synchronous groove, and the synchronous part of any drum tile is assembled with the synchronous groove of the adjacent drum tile in a sliding mode. The drum tiles are arranged on the shaping drum and used for keeping synchronous expansion and contraction of the multiple sets of drum tiles, so that the expansion speeds of the multiple sets of drum tiles tend to be consistent, synchronous expansion and contraction of the multiple sets of drum tiles on the shaping drum are kept, the forming precision and consistency of tires are improved, the machining quality of the tires is improved, the expansion distance of the drum tiles is adjusted, and machining of tires of similar sizes is compatible.

Description

Technical Field

[0001] The invention relates to the technical field of shaping drums for producing tires, in particular to an expansion and contraction shaping drum which can convert axial motion into radial motion. Background Art

[0002] The production process of rubber tires mainly includes the following steps: first, raw material preparation, processing and mixing rubber, carbon black, sulfur and other raw materials; then, tire blank molding, pressing the mixed rubber material through a mold to make a tire blank; then, tire blank shaping, placing the tire blank on a shaping drum for expansion and shaping to fix its shape; then, tread molding, attaching the tread material to the shaped tire body; finally, tire vulcanization, placing the tire in a vulcanizer for heating and pressurization to make it a final tire product.

[0003] The tire embryo molding is an important process in the tire production process, which largely determines the quality of the tire, including dynamic balance performance, safety performance, uniformity and comfort, and the expansion and contraction accuracy and stability of the shaping drum play a decisive role in the tire embryo molding. The expansion and contraction shaping drum in the prior art adopts two structures for converting axial motion into radial motion, namely a connecting rod structure and a conical slide seat structure;

[0004] The connecting rod type shaping drum has good support and can keep the drum shell at a certain diameter position during the movement of the connecting rod. Therefore, it is compatible with the production of tires of various specifications and is widely used. However, as pointed out in a high-performance sedan tire shaping drum with announcement number CN213830420U, the connecting rod cannot ensure the synchronization and accuracy between various components during the movement, thereby affecting the molding quality of the tire. Therefore, a conical slide seat is used to replace the connecting rod seat, and the expansion and contraction transmission mode of the shaping drum is improved, which effectively improves the accuracy and service life of the shaping drum, ensures the high accuracy and high performance of the tire blank, thereby improving production efficiency, and improving product quality and balance;

[0005] However, for the shaping drum with a conical slide structure, since the tire body is wrapped on the outer wall of the drum tile, when the force is transmitted to the conical slide, the conical slide is easily squeezed radially by the tire blank, and the conical slide has a tendency to move along its axis and cause the shaping drum to shrink. The drum tile has poor expansion retention, which can easily cause poor quality with the actual processing size being smaller than the theoretical design size. In addition, since the conical slide is easily displaced after being squeezed by the tire blank, the conical slide is in the most unstable state when it is in the middle section of its axis movement stroke. This causes a shaping drum with a conical slide structure to be only suitable for processing one tire specification. As pointed out in a semi-steel two-stage shaping drum with adjustable expansion and contraction diameter with publication number CN209096075U, when changing specifications, it is necessary to adjust the piston stroke and replace the PU ring, etc. This process requires replacement of parts, is cumbersome to operate, and is inefficient, increasing production costs and time. Summary of the invention

[0006] In order to solve the problem in the prior art that the expansion and contraction synchronization of the pull rod type molding drum is poor, which affects the poor quality of the tire blank molding, and to achieve expansion and contraction processing of tires with similar size specifications, the present application provides an expansion and contraction molding drum that converts axial movement into radial movement.

[0007] The present invention provides an expansion and contraction shaping drum that converts axial motion into radial motion, which adopts the following technical solution:

[0008] A drum for expanding and contracting that converts axial motion into radial motion, comprising a drum seat, an end cover, an inner cylinder, a piston, an outer cylinder, a connecting rod, and a drum shoe. The end cover is arranged in a T-shape and assembled with the drum seat. The inner cylinder is assembled with the end cover to form a sealed air chamber. The piston is assembled in the air chamber to separate the air chamber into a sealed upper air chamber and a lower air chamber. The end cover is provided with an upper air hole connected to the upper air chamber and a lower air hole connected to the lower air chamber. The drum seat is provided with an annular groove toward the end cover. The outer cylinder is rotatably assembled with the inner wall of the annular groove. The outer cylinder is provided with a rotary groove extending obliquely along its axial direction. The inner cylinder The outer ring wall is connected with a transmission pin, which is slidably assembled on the inner wall of the rotation groove and is used to rotate the outer cylinder body, and the drum shoe is slidably assembled between the end cover and the drum seat. The drum shoe is provided with multiple groups and is arranged at equal angles along the axis of the drum seat. The two ends of the connecting rod are rotatably assembled with the drum shoe and the outer ring wall of the outer cylinder body respectively, and the connecting rod is provided with multiple groups of drum shoes corresponding to the drum shoe, one side wall of the drum shoe is connected with a synchronization piece, and the other side wall of the drum shoe is provided with a synchronization groove, the synchronization piece of any group of the drum shoes is slidably assembled with the synchronization groove of the adjacent group of the drum shoes, and is used to keep the synchronous expansion and contraction of multiple groups of drum shoes.

[0009] Preferably, the side wall of the end cover facing the drum shoe has a protruding guide strip, the axis of the guide strip is perpendicular to the axis of the end cover, the drum shoe has a guide groove corresponding to the guide strip, and the inner wall of the guide groove is slidably assembled with the guide strip.

[0010] Preferably, the inner wall cross-section of the synchronization groove is semicircular, the center of the synchronization groove is located in the synchronization groove, and the synchronization groove is connected to the side wall of the drum shoe, and the synchronization member is semicircularly arranged corresponding to the inner wall of the synchronization groove.

[0011] Preferably, the end of the synchronizing member away from the synchronizing groove has a protruding mounting portion, the mounting portion is arranged tangent to the diameter of the synchronizing member, the drum shoe is provided with a mounting groove for installing the synchronizing member, the mounting groove is connected to the side wall of the drum shoe, and the mounting groove and the synchronizing groove are respectively located on the left and right sides of the guide groove.

[0012] Preferably, the outer cylinder body has protruding lugs, and the lugs are provided in two groups and are respectively located on both sides of the connecting rod. The drum shoe is provided with a groove on the side wall facing the connecting rod. One end of the connecting rod is rotatably assembled with the two groups of lugs through a rotating shaft, and the other end of the connecting rod is rotatably assembled in the inner wall of the groove through a rotating shaft. The outer cylinder body is provided with a clearance groove, and the clearance groove is located between the two groups of lugs.

[0013] Preferably, a circular limiting groove is formed at one end of the outer cylinder close to the end cover, and the end cover has a raised annular protrusion, which is located in the limiting groove and is used to limit the outer cylinder.

[0014] Preferably, the annular protrusion is composed of two groups of semi-ring blocks, the cross-section of the semi-ring blocks is arranged in a U-shape, the end cover is provided with an annular groove for assembling the two groups of the semi-ring blocks, and the semi-ring blocks are screwed to the end cover.

[0015] Preferably, it also includes a guide member, and a guide groove for slidingly assembling the guide member is opened on the end wall of the inner cylinder toward the end cover, the axis of the guide groove is arranged parallel to the axis of the outer cylinder, one end of the guide member is connected to the end cover, and the other end of the guide member is inserted in the guide groove, and the guide member is provided in at least two groups, and the two groups of guide members are located on the same diameter of the inner cylinder.

[0016] Preferably, a silicone pad is further included, and the drum shoe is provided with a U-shaped groove on its radial outer side wall, one end of the silicone pad is connected to the end cover, and the other end of the silicone pad is matched with the inner wall of the U-shaped groove and assembled in the U-shaped groove.

[0017] Preferably, 16 groups of drum shoes are arranged, an angle a is formed between the axis of the synchronous groove and the axis of the guide groove, and the angle a is 75-80°; an angle b is formed between the axis of the rotary groove and the bottom wall of the end of the outer cylinder away from the end cover, and the angle b is 28°-32°.

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

[0019] By providing a synchronization member, when the expansion speeds of two adjacent groups of drum tiles are inconsistent, the two adjacent groups of drum tiles are balanced by the synchronization member to keep them consistent. In this way, multiple groups of synchronization members balance and synchronize the drum tiles arranged in an annular manner, so that the expansion speeds of multiple groups of drum tiles tend to be consistent, and the multiple groups of drum tiles on the shaping drum are kept to expand and contract synchronously, which solves the problem of poor synchronization of the connecting rod type structure in the prior art, improves the molding accuracy and consistency of the tire, and improves the processing quality of the tire. At the same time, it also avoids the shrinkage of the drum tiles under the force of the embryo after expansion, effectively resists the radial extrusion of the tire rubber, improves the stability of the shaping process and the molding quality of the tire, and solves the problem of poor support of the conical slide seat structure in the prior art. In addition, by controlling the amount of compressed air introduced into the upper and lower air holes, the expansion distance of the drum tiles can be adjusted, and the expansion diameter of the drum tiles can be controlled in conjunction with the sensors on the shaping machine, thereby realizing the embryo shaping of tires of different specifications, and realizing the shaping processing of tires compatible with similar size specifications, avoiding the problem of difficulty in switching specifications, and improving production efficiency and flexibility.

[0020] By providing guide strips to limit the movement freedom of the drum tile, the radial movement range of the drum tile is limited, and the possibility of the drum tile swinging under the push of the connecting rod is reduced. The drum tile can move smoothly along the radial direction of the shaping drum under the push of the connecting rod, and with the coordinated action of the synchronous parts, the expansion and contraction accuracy of the drum tile is significantly improved, which ensures the concentricity of the drum tile during movement, avoids the inclination or deviation of the drum tile, further improves the molding accuracy of the tire, effectively reduces the dimensional deviation in the tire molding process, and improves the molding quality of the tire.

[0021] By providing an annular protrusion to limit the rotation of the outer cylinder, the coaxiality of the outer cylinder and the end cover is improved, the outer cylinder is allowed to rotate around its axis, the freedom of the outer cylinder is limited, the rotation and rotation accuracy of the outer cylinder is improved, the expansion and contraction of the drum shell is more accurately controlled, the accuracy of tire molding is improved, the size and quality of the tire are ensured, thereby ensuring the reliability and stability of the expansion and contraction processing of tires with similar size specifications.

[0022] By providing a guide to limit the movement of the inner cylinder, when compressed air pushes the inner cylinder to move, it moves along the guide, reducing the possibility of deflection of the inner cylinder. At the same time, the guide can provide a supporting force, so that the inner cylinder pushes the outer cylinder to rotate, while the outer cylinder is difficult to push the inner cylinder to move axially, thereby reducing the risk of the drum shell being contracted by the force of the tire blank, improving the self-locking effect of the expansion and contraction of the shaping drum, and improving the processing quality of the shaping drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereogram in the embodiment of the present application;

[0024] Figure 2 It is the main view in the embodiment of the present application;

[0025] Figure 3 yes Figure 2 A sectional stereogram at AA in the middle;

[0026] Figure 4 yes Figure 2 Sectional view at the middle BB;

[0027] Figure 5 It is a rear split stereogram in an embodiment of the present application;

[0028] Figure 6 It is a front split stereogram in an embodiment of the present application;

[0029] Figure 7 It is a partial stereogram in the embodiment of the present application;

[0030] Figure 8 yes Figure 7 The main view of

[0031] Fig. 9 yes Figure 8 A cross-sectional view of

[0032] Fig.10 It is a partial split diagram in the embodiment of the present application;

[0033] Fig.11 is a three-dimensional diagram of a drum tile in an embodiment of the present application;

[0034] Fig.12 It is a front view of the drum tile in the embodiment of the present application;

[0035] Fig.13 is a three-dimensional diagram of a synchronous member in an embodiment of the present application;

[0036] Fig.14 It is a diagram of the expanded state in the embodiment of the present application;

[0037] Fig.15is a partial diagram of the contracted state in the embodiment of the present application;

[0038] Fig.16 yes Fig.15 Partial split diagram.

[0039] Description of reference numerals: 1, drum seat; 101, annular groove; 2, end cover; 201, guide strip; 202, semi-ring block; 203, annular groove; 204, assembly groove; 3, inner cylinder; 301, upper air chamber; 302, lower air chamber; 303, upper air hole; 304, lower air hole; 305, transmission pin; 306, rolling bearing; 307, guide groove; 4, piston; 5, outer cylinder; 501 , rotation groove; 502, lug; 503, give way groove; 504, limit groove; 505, shaft groove; 6, connecting rod; 7, drum shoe; 701, synchronous member; 702, mounting portion; 703, synchronous groove; 704, U-shaped groove; 705, guide groove; 706, mounting groove; 707, groove; 708, avoidance groove; 8, guide member; 9, silicone pad; 901, hook; 902, pressure ring. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] In the description of the present application, if it involves directional descriptions, such as "axial" and "radial", "axial" refers to the axial direction of the designated drum, and "radial" refers to the diameter direction of the designated drum.

[0043] 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.

[0044] 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.

[0045] Example 1: Figures 1 to 16 As shown, an expansion and contraction shaping drum that converts axial motion into radial motion comprises a drum base 1, an end cover 2, an inner cylinder 3, a piston 4, an outer cylinder 5, a connecting rod 6, and a drum shoe 7. The end cover 2 is arranged in a T shape and assembled with the drum base 1. The drum base 1 is provided with an annular groove 101 toward the end cover 2. The inner cylinder 3 is assembled with the end cover 2 to form a sealed air chamber. The piston 4 is assembled in the air chamber to separate the air chamber into a sealed upper air chamber 301 and a lower air chamber 302. The end cover 2 is provided with an upper air hole 303 connected to the upper air chamber 301 and a lower air hole 304 connected to the lower air chamber 302. The outer cylinder 5 is rotatably assembled with the inner wall of the annular groove 101. The outer cylinder 5 is provided with a rotary groove 5 extending obliquely along its axial direction. 01, the outer ring wall of the inner cylinder 3 is connected with a transmission pin 305, the transmission pin 305 is slidably assembled on the inner wall of the rotation groove 501 and is used to rotate the outer cylinder 5, the drum shoe 7 is slidably assembled between the end cover 2 and the drum seat 1, and there are multiple groups of drum shoes 7 and they are arranged at equal angles along the axis of the drum seat 1. The two ends of the connecting rod 6 are rotatably assembled with the drum shoe 7 and the outer ring wall of the outer cylinder 5 respectively. There are multiple groups of drum shoes 7 corresponding to the connecting rod 6. One side wall of the drum shoe 7 is connected with a synchronization piece 701, and the other side wall of the drum shoe 7 is provided with a synchronization groove 703. The synchronization piece 701 of any group of drum shoes 7 is slidably assembled with the synchronization groove 703 of an adjacent group of drum shoes 7, so as to keep multiple groups of drum shoes 7 in synchronous expansion and contraction.

[0046] It is worth mentioning that both the drum seat 1 and the end cover 2 are provided with axial through holes for assembling the expansion and contraction shaping drum with the main shaft of the tire forming machine. When the expansion and contraction shaping drum is assembled on the tire forming machine, the upper air hole 303 and the lower cylinder are respectively connected to the two air pipes of the tire forming machine. When compressed air is introduced into the upper air hole 303, the upper air chamber 301 is filled with compressed air, so that the inner cylinder 3 moves toward the end cover 2. After the inner cylinder moves, the transmission pin 305 cooperates with the rotation groove 501 to drive the outer cylinder 5 to rotate. The rotation of the outer cylinder 5 causes the connecting rod 6 to move away from the expansion and contraction shaping drum. The drum shell 7 is swung in the central direction, driving the drum shell 7 to move outward along the radial direction of the expansion and contraction shaping drum, thereby realizing the expansion of the shaping drum. Of course, when the shaping drum needs to be contracted, compressed air is introduced into the lower air hole 304 to make the outer cylinder 5 rotate counterclockwise. When the shaping drum needs to maintain a certain expansion size, the expansion distance of the drum shell 7 can be accurately adjusted by controlling the amount of compressed air introduced into the upper air hole 303 and the lower air hole 304, thereby realizing the shaping of tire blanks of different specifications, avoiding the problem of difficulty in switching specifications in the prior art, and improving production efficiency and flexibility; secondly, When multiple groups of bearing shells are pushed to expand by multiple groups of connecting rods 6, the expansion speeds of different drum shells 7 are different, so that the expanded drum shells 7 cannot form a perfect circle. By providing a synchronous member 701, when the expansion speeds of two adjacent groups of drum shells 7 are inconsistent, the synchronous member 701 balances the two adjacent groups of drum shells 7 to keep them consistent. In this way, multiple groups of synchronous members 701 balance and synchronize the drum shells 7 arranged in an annular manner, so that the expansion speeds of multiple groups of drum shells 7 tend to be consistent, so that the expanded drum shells 7 can form a perfect circle, ensuring that each drum shell 7 can be expanded and contracted synchronously, thus avoiding the problem of poor synchronization of the connecting rod 6 type structure in the prior art, improving the molding accuracy and consistency of the tire, and thus improving the processing quality of the tire; furthermore, by providing a synchronous member 701, the expanded position of the drum shoe 7 can be maintained, avoiding the possibility of the drum shoe 7 shrinking under the force of the tire embryo after expansion, and can effectively resist the radial extrusion of the tire rubber, and is balanced by the synchronous member 701, avoiding the problem of poor support of the conical slide seat structure in the prior art, and ensuring the stability of the shaping process and the molding quality of the tire.

[0047] In terms of the specific structure of the piston 4 assembled in the air chamber for dividing the air chamber into a sealed upper air chamber 301 and a lower air chamber 302, a sealing groove for assembling a sealing ring is provided at one end of the piston 4, the sealing ring is connected to the inner wall of the inner cylinder 3, and the end cover 2 is provided with a shoulder for assembling with the piston 4, and the other end of the piston 4 abuts against the shoulder and is limited by a clamp on the other side of its axial direction.

[0048] Furthermore, in order to improve the accuracy of the radial movement of the drum tile 7 along the shaping drum and reduce the possibility of the drum tile 7 swinging under the push of the connecting rod 6, the side wall of the end cover 2 facing the drum tile 7 has a raised guide strip 201, and the axis of the guide strip 201 is perpendicular to the axis of the end cover 2. The drum tile 7 is provided with a guide groove 705 corresponding to the guide strip 201, and the inner wall of the guide groove 705 is slidably assembled with the guide strip 201. It is worth mentioning that the axis of the guide strip 201 passes through the center of the circle of the end cover 2.

[0049] Through the precise sliding cooperation between the guide strip 201 and the guide groove 705, the radial movement range of the drum tile 7 is limited, and the possibility of the drum tile 7 swinging under the push of the connecting rod 6 is reduced. The drum tile 7 can move smoothly along the radial direction of the shaping drum under the push of the connecting rod 6. Under the coordinated action of the synchronizer 701, the expansion and contraction accuracy of the drum tile 7 is significantly improved, which ensures the concentricity of the drum tile 7 during the movement, avoids the drum tile 7 from tilting or offset, further improves the molding accuracy of the tire, effectively reduces the dimensional deviation during the tire molding process, and improves the molding quality of the tire.

[0050] In order to improve the uniformity of force applied by the guide bar 201 to the drum tile 7, the guide groove 705 is located in the middle of the drum tile 7, a synchronization piece 701 is connected to one side of the guide groove 705, and a synchronization groove 703 is opened on the other side of the guide groove 705 to improve the uniformity of force applied to the drum tile 7, thereby further improving the accuracy of radial movement of the drum tile 7.

[0051] Although the synchronous member 701 and the synchronous groove 703 with circular cross-sections can improve the smoothness of the sliding fit between the two, the circular cross-section design lacks a limiting function, which may cause the synchronous member 701 to twist, thereby affecting the synchronization of the drum shoe 7. In addition, when the synchronous member 701 slides in the synchronous groove 703, the air in the groove will be compressed. If the synchronous groove 703 is a blind hole design, the compressed air will generate counterpressure, hindering the further movement of the synchronous member 701, which will have an adverse effect on the synchronization effect of the synchronous member 701 coordinating the two adjacent groups of drum shoes 7. In order to solve the above technical problems, it is necessary to improve the sliding assembly structure between the synchronizer 701 and the synchronizer groove 703 of an adjacent group of drum tiles 7. The inner wall cross-section of the synchronizer groove 703 is semicircular, the center of the synchronizer groove 703 is located in the synchronizer groove 703, and the synchronizer groove 703 is connected to the side wall of the drum tile 7. The inner wall of the synchronizer groove 703 corresponding to the synchronizer 701 is semicircular. By making the center of the synchronizer groove 703 located in the synchronizer groove 703, it can be ensured that when the synchronizer 701 slides in the synchronizer groove 703, the inner wall of the synchronizer groove 703 can effectively limit the synchronizer 701, thereby reducing the risk of the synchronizer 701 slipping out from the connection between the synchronizer groove 703 and the side wall of the drum tile 7, improving the accuracy of the movement of the synchronizer 701 and the uniqueness of the direction, thereby ensuring the synchronization of the two adjacent groups of drum tiles 7. The structure in which the synchronous groove 703 is connected to the side wall of the drum shoe 7 is adopted because when the synchronous member 701 moves in the synchronous groove 703, the air in the synchronous groove 703 can be discharged smoothly, avoiding the formation of air pressure to hinder the movement of the synchronous member 701, and further improving the smoothness of the sliding assembly between the synchronous member 701 and the inner wall of the synchronous groove 703. Therefore, the design of the synchronous member 701 with a semicircular cross section and the synchronous groove 703 with a semicircular interface can not only play a limiting role, but also improve the smoothness of the sliding of the synchronous member 701.

[0052] Furthermore, in order to improve the smoothness of sliding of the synchronizer 701, the drum shoe 7 is made of self-lubricating nylon material, and the synchronizer 701 is made of 45 steel, ensuring that the synchronizer 701 and the drum shoe 7 maintain a low friction coefficient during long-term use, thereby ensuring the smoothness of sliding of the synchronizer 701, reducing the replacement frequency, and thus reducing the long-term replacement cost.

[0053] In order to reduce the processing difficulty of the drum tile 7 and the synchronous member 701, the drum tile 7 and the synchronous member 701 adopt a split design, and the end of the synchronous member 701 connected to the drum tile 7 is connected by a screw. If the mounting groove 706 with a semicircular cross-section is also used, it will be inconvenient to assemble the synchronous member 701. Therefore, in terms of the specific structure of the assembly of the synchronous member 701 and the hanging drum tile 7, the end of the synchronous member 701 away from the synchronous groove 703 has a raised mounting portion 702, and the mounting portion 702 is tangent to the diameter of the synchronous member 701, and the drum tile 7 is provided with a mounting groove 706 for installing the synchronous member 701. The mounting groove 706 is connected to the side wall of the drum tile 7, and the mounting groove 706 and the synchronous groove 703 are respectively located on the left and right sides of the guide groove 705.

[0054] Specifically, one end of the synchronizer 701 is provided with a mounting portion 702 to form a semi-rectangular cross-section. Of course, the cross-section of the mounting groove 706 is also a semi-rectangular cross-section. Since the mounting portion 702 is tangent to the diameter of the synchronizer 701, when the synchronizer 701 is fixedly assembled with the mounting groove 706 of the drum tile 7, the opening of the mounting groove 706 is larger than the outer wall of the synchronizer 701, thereby facilitating the placement of the synchronizer 701 into the mounting groove 706. The mounting portion 702 with a rectangular cross-section acts as a limiter on the mounting groove 706, reducing the possibility of deflection of the mounting member during movement, thereby improving the synchronization and coordination of movement between two adjacent groups of drum tiles 7, and improving the expansion and contraction accuracy of the drum tile 7.

[0055] It is worth noting that the synchronizer 701 is provided with a through hole for inserting a fixing screw from the mounting portion 702 inwardly, and a threaded hole is provided on the inner wall of the mounting groove 706 corresponding to the through hole. When the synchronizer 701 is assembled with the drum tile 7, the synchronizer 701 is fixed to the drum tile 7 by the fixing screws. The split design of the drum tile 7 and the synchronizer 701 reduces the processing difficulty, and also facilitates the use of different materials for the drum tile 7 and the synchronizer 701. Since the material hardness of the synchronizer 701 is greater than that of the drum tile 7, the drum tile 7 will wear out first during use. At the same time, since the outer ring wall of the drum tile 7 is the processing contact surface, that is, the drum tile 7 is a wearing part, the wear amount is designed to be evenly distributed on the drum tile 7, and the number of parts to be replaced is reduced, thereby reducing the replacement cost.

[0056] In order to improve the compactness of the structure of the expansion and contraction shaping drum, in terms of the specific structure of the rotational assembly of the connecting rod 6 and the outer cylinder 5, the outer cylinder 5 has a protruding lug 502, and the lug 502 is provided with two groups and is respectively located on both sides of the connecting rod 6. The drum shoe 7 is provided with a groove 707 on the side wall facing the connecting rod 6. One end of the connecting rod 6 is rotationally assembled with the two groups of lugs 502 through a rotating shaft, and the other end of the connecting rod 6 is rotationally assembled in the inner wall of the groove 707 through a rotating shaft. The outer cylinder 5 is provided with a clearance groove 503, and the clearance groove 503 is located between the two groups of lugs 502. By providing the clearance groove 503, the connecting rod is prevented from During the rotation of connecting rod 6, there is a risk of interference with the outer annular wall of the outer cylinder body 5. In order to improve the smoothness of the swing of connecting rod 6, a groove 707 is provided to limit the swing of connecting rod 6, so that connecting rod 6 swings along the inner wall of groove 707, thereby improving the accuracy of movement of drum bush 7 driven by the swing of pull rod, and improving the radial movement accuracy of drum bush 7. In order to ensure that the rotating shaft can pass through the outer annular wall of the outer cylinder body 5, a rotating shaft groove 505 is provided on the outer annular wall of the outer cylinder body 5. The rotating shaft groove 505 plays a role of avoiding the rotating shaft. At the same time, the rotating shaft contacts the inner wall of the rotating shaft groove 505, which plays a role of limiting the rotating shaft.

[0057] In order to improve the rotation accuracy of the outer cylinder 5, reduce the deflection of the outer cylinder 5, and thus improve the expansion and contraction accuracy of the shaping drum, in terms of the specific structure of the rotational assembly of the outer cylinder 5 and the end cover 2, a circular ring-shaped limiting groove 504 is opened at one end of the outer cylinder 5 close to the end cover 2, and the end cover 2 has a raised annular protrusion, which is located in the limiting groove 504 and is used to limit the outer cylinder 5. Of course, the inner diameter of the outer cylinder 5 is sleeved on the outer wall of the T-shaped end cover 2 to improve the coaxiality of the assembly. The axis of the limiting groove 504 is coaxially arranged with the axis of the outer cylinder 5. By providing the annular raised limiting groove 504, the outer cylinder 5 can rotate around its axis, limit the degree of freedom of the outer cylinder 5, improve the rotation accuracy of the outer cylinder 5, and improve the rotation accuracy of the outer cylinder 5. The expansion and contraction of the shaping drum can be controlled more accurately, thereby improving the accuracy of tire molding, ensuring the size and quality of the tire, and ensuring the reliability and stability of the expansion and contraction processing of tires with similar size specifications.

[0058] In terms of the specific assembly structure of the annular protrusion and the outer cylinder body 5, in order to reduce the processing and manufacturing difficulty and facilitate assembly, the annular protrusion is composed of two groups of semi-ring blocks 202. The cross-section of the semi-ring block 202 is arranged in a C shape. The end cover 2 is provided with an annular groove 203 for assembling the two groups of semi-ring blocks 202. The semi-ring block 202 is screwed to the end cover 2. A screw hole is provided on the side wall of the semi-ring block 202 away from the outer cylinder body 5, and a through hole corresponding to the screw hole is provided on the inner wall of the annular groove 203. The two groups of semi-ring blocks 202 are respectively assembled in the limit groove 504 of the outer cylinder body 5, so as to perform annular limitation on the outer cylinder body 5. Then, the two groups of semi-circular blocks are installed in the annular groove 203 to limit the two groups of semi-ring blocks 202, so that the two groups of semi-ring blocks 202 form an annular protrusion. Then, the locking screw is used to lock the screw from the outer wall of the end cover 2 towards the screw hole of the semi-ring block 202, thereby reducing the processing difficulty of integrally forming the annular protrusion and the end cover 2, improving the convenience of the rotational assembly of the end cover 2 and the outer cylinder body 5, and improving the rotational accuracy of the outer cylinder body 5.

[0059] In order to improve the axial movement accuracy of the inner cylinder body 3, in terms of the specific assembly structure of the inner cylinder body 3, this embodiment further includes a guiding member 8. A guiding groove 307 for slidably assembling the guiding member 8 is provided on the end wall of the inner cylinder body 3 facing the end cover 2. The axis of the guiding groove 307 is parallel to the axis of the outer cylinder body 5. One end of the guiding member 8 is connected to the end cover 2, and the other end of the guiding member 8 is inserted into the guiding groove 307. At least two groups of guiding members 8 are provided, and the two groups of guiding members 8 are located on the same diameter of the inner cylinder body 3. By providing the guiding member 8 connected to the end cover 2, when compressed air pushes the inner cylinder body 3 to move, it moves along the guiding member 8, reducing the possibility of the inner cylinder body 3 deflecting. At the same time, the guiding member 8 can provide a supporting force, so that the inner cylinder body 3 pushes the outer cylinder body 5 to rotate, and it is difficult for the outer cylinder body 5 to push the inner cylinder body 3 to move axially, thereby reducing the risk of the drum tile 7 shrinking due to the force of the embryo, improving the self-locking effect of the expansion and contraction of the sizing drum, and improving the processing quality of the sizing drum.

[0060] In order to reduce the friction force between the transmission pin 305 and the inner wall of the spiral groove 501, this embodiment further includes a rolling bearing 306. The inner ring of the rolling bearing 306 is connected to the transmission pin 305, and the outer ring of the rolling bearing 306 is rotatably assembled with the inner wall of the spiral groove 501. The assembly method of the inner ring of the rolling bearing 306 and the transmission pin 305 is a common assembly method in the prior art, that is, it only needs to satisfy that the rolling bearing 306 is fixedly assembled on the transmission pin 305.

[0061] In order to reduce the wear of the drum shoe 7, the present embodiment also includes a silicone pad 9. The drum shoe 7 has a U-shaped groove 704 on its radial outer wall. One end of the silicone pad 9 is connected to the end cover 2, and the other end of the silicone pad 9 is matched with the inner wall of the U-shaped groove 704 and assembled in the U-shaped groove 704. Since the silicone pad 9 can effectively reduce wear, the replacement frequency of the drum shoe 7 can be reduced, the maintenance workload can be reduced, and the maintenance cost can be reduced.

[0062] In order to increase the expansion and contraction of the drum tile 7, an avoidance groove 707 is opened on the bottom wall of the drum tile 7, and the avoidance groove 707 is adapted to the lug 502. When the drum tile 7 is in a contracted state, the lug 502 is located in the avoidance groove 707, thereby increasing the contraction amount of the drum tile 7 and avoiding the risk of interference between the drum tile 7 and the lug 502.

[0063] In terms of the specific assembly structure of the silicone pad 9 and the end cover 2, in order to reduce the risk of the silicone pad 9 falling off, the present embodiment also includes a pressure ring 902, and a ring-shaped assembly groove 204 is provided on the outward side wall of the end cover 2. The silicone pad 9 and the end cover 2 are bent at one end of the assembly to provide a hook 901, and the hook 901 is located in the assembly groove 204. The pressure ring 902 is screwed to the end cover 2 and is covered on the silicone pad 9 to compress the silicone pad 9, thereby preventing the silicone pad 9 from falling off.

[0064] Example 2: Figures 1 to 16 As shown, this embodiment provides a specific implementation of an expansion and contraction shaping drum, including an expansion and contraction shaping drum that converts axial movement into radial movement in Example 1, wherein 16 groups of drum shoes 7 are provided, and an angle a is formed between the axis of the synchronous groove 703 and the axis of the guide groove 705, and the angle a is 75-80°. Preferably, the angle a is 79°. An angle b is formed between the axis of the rotary groove 501 and the bottom wall of the end of the outer cylinder 5 away from the end cover 2, and the angle b is 28°-32°. Preferably, the angle b is 29°.

[0065] 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. An expansion and contraction shaping drum that converts axial motion into radial motion, characterized in that: It includes a drum seat, an end cover, an inner cylinder, a piston, an outer cylinder, a connecting rod, and a drum shoe. The end cover is T-shaped and assembled with the drum seat. The inner cylinder is assembled with the end cover to form a sealed air chamber. The piston is assembled in the air chamber to separate the air chamber into a sealed upper air chamber and a lower air chamber. The end cover is provided with an upper air hole connected to the upper air chamber and a lower air hole connected to the lower air chamber. The drum seat is provided with an annular groove toward the end cover. The outer cylinder is rotatably assembled with the inner wall of the annular groove. The outer cylinder is provided with a rotary groove extending obliquely along its axial direction. The outer annular wall of the inner cylinder is connected with a transmission pin. The transmission pin is slidably assembled on the inner wall of the rotating groove and is used to rotate the outer cylinder body. The drum shoe is slidably assembled between the end cover and the drum seat. The drum shoe is provided in multiple groups and is arranged at equal angles along the axis of the drum seat. The two ends of the connecting rod are rotatably assembled with the drum shoe and the outer ring wall of the outer cylinder body respectively. The connecting rod is provided with multiple groups corresponding to the drum shoe. A synchronization piece is connected to one side wall of the drum shoe, and a synchronization groove is opened on the other side wall of the drum shoe. The synchronization piece of any group of the drum shoes is slidably assembled with the synchronization groove of an adjacent group of the drum shoes, and is used to maintain the synchronous expansion and contraction of multiple groups of the drum shoes.

2. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 1, characterized in that: The side wall of the end cover facing the drum shoe has a protruding guide strip, the axis of the guide strip is perpendicular to the axis of the end cover, the drum shoe has a guide groove corresponding to the guide strip, and the inner wall of the guide groove is slidably assembled with the guide strip.

3. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 1, characterized in that: The inner wall cross section of the synchronization groove is semicircular, the center of the synchronization groove is located in the synchronization groove, and the synchronization groove is connected to the side wall of the drum shoe, and the synchronization member is semicircularly arranged corresponding to the inner wall of the synchronization groove.

4. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 3, characterized in that: The end of the synchronizer away from the synchronizer groove has a protruding mounting portion, and the mounting portion is tangent to the diameter of the synchronizer. The drum shoe has a mounting groove for mounting the synchronizer, and the mounting groove is connected to the side wall of the drum shoe. The mounting groove and the synchronizer groove are respectively located on the left and right sides of the guide groove.

5. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 1, characterized in that: The outer cylinder body has a protruding lug, and the lug is provided in two groups and is respectively located on both sides of the connecting rod. The drum shoe is provided with a groove on the side wall facing the connecting rod. One end of the connecting rod is rotatably assembled with the two groups of lugs through a rotating shaft, and the other end of the connecting rod is rotatably assembled in the inner wall of the groove through the rotating shaft. The outer cylinder body has a clearance groove, and the clearance groove is located between the two groups of lugs.

6. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 1, characterized in that: A circular limiting groove is formed at one end of the outer cylinder body close to the end cover, and the end cover has an annular protrusion which is arranged in a raised manner. The annular protrusion is located in the limiting groove and is used to limit the outer cylinder body.

7. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 6, characterized in that: The annular protrusion is composed of two groups of semi-ring blocks, the cross-section of the semi-ring blocks is arranged in a U-shape, and the end cover is provided with a circular ring groove for assembling the two groups of the semi-ring blocks, and the semi-ring blocks are screwed to the end cover.

8. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 1, characterized in that: It also includes a guide member, wherein the end wall of the inner cylinder facing the end cover is provided with a guide groove for slidingly assembling the guide member, the axis of the guide groove is arranged parallel to the axis of the outer cylinder, one end of the guide member is connected to the end cover, and the other end of the guide member is inserted in the guide groove, and at least two groups of the guide members are arranged, and the two groups of the guide members are located on the same diameter of the inner cylinder.

9. The expansion and contraction shaping drum that converts axial motion into radial motion according to claim 1, characterized in that: It also includes a silicone pad, and the drum shoe has a U-shaped groove on its radial outer side wall. One end of the silicone pad is connected to the end cover, and the other end of the silicone pad is matched with the inner wall of the U-shaped groove and assembled in the U-shaped groove.

10. The expansion and contraction shaping drum that converts axial motion into radial motion according to any one of claims 2 to 9, characterized in that: There are 16 groups of drum shoes, and the axis of the synchronous groove and the axis of the guide groove form an angle a of 75 to 80 degrees. The axis of the rotary groove and the bottom wall of the end of the outer cylinder away from the end cover form an angle b of 28 to 32 degrees.

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