Chuck structure and forming drum

Abstract

The present invention provides a chuck structure and a forming drum. The chuck structure is used to position a carcass tube on the forming drum. The chuck structure includes a mounting sleeve and a chuck assembly. The chuck assembly is telescopically arranged on the mounting sleeve. Among them, the chuck assembly has an avoidance position and a positioning position, so that when the chuck assembly contracts to the avoidance position, the carcass tube can pass through the chuck assembly, and when the chuck assembly expands to the positioning position, the carcass tube is fixed on the forming drum. The chuck structure of the present invention solves the problem of low matching efficiency between the existing forming drum and the carcass tube.

Description

Technical Field

[0001] The present invention relates to the technical field of tire manufacturing, and more particularly, to a chuck structure and a building drum. Background Art

[0002] At present, the production of engineering tires and giant tires generally adopts a two-stage forming process. The second-stage building drum and winding drum of the two-stage forming process usually adopt a fixed chuck structure. When transferring the carcass tube or removing the tire, since the outer diameter of the fixed chuck is larger than the inner diameter of the tire bead, it is necessary to manually remove the chuck on the outer side of the drum and then reinstall it in order to transfer the carcass tube into the building drum and winding drum or remove the formed tire; the chuck is relatively heavy, and the chuck of a giant tire is about 300 Kg, and manual disassembly is very inconvenient. Each disassembly and assembly of the chuck takes about 40 minutes, which seriously affects the transfer efficiency of the carcass tube and has a certain impact on the tire quality. Summary of the Invention

[0003] The main object of the present invention is to provide a chuck structure and a building drum to solve the problem of low matching efficiency between the existing building drum and the carcass tube.

[0004] To achieve the above object, according to one aspect of the present invention, there is provided a chuck structure for positioning a carcass tube on a building drum. The chuck structure includes a mounting sleeve and a chuck assembly. The chuck assembly is telescopically arranged on the mounting sleeve. Wherein, the chuck assembly has a retracted position and a positioning position, so that when the chuck assembly contracts to the retracted position, the carcass tube can pass through the chuck assembly, and when the chuck assembly expands to the positioning position, the carcass tube is fixed on the building drum.

[0005] Further, the chuck assembly includes: a plurality of first segments, the plurality of first segments are arranged at intervals around the mounting sleeve, and each first segment is telescopically arranged along the radial direction of the mounting sleeve; a plurality of second segments, the plurality of second segments are arranged at intervals around the mounting sleeve, and each second segment is telescopically arranged along the radial direction of the mounting sleeve; wherein, the plurality of first segments and the plurality of second segments are alternately arranged in sequence.

[0006] Further, the chuck assembly further includes: a driving mechanism; a plurality of first connecting rods, the plurality of first connecting rods are respectively connected to the driving mechanism, and the plurality of first connecting rods are arranged in one-to-one correspondence with the plurality of first segments. Wherein, the driving mechanism drives the first segment to move through the first connecting rod; a plurality of second connecting rods, the plurality of second connecting rods are respectively connected to the driving mechanism, and the plurality of second connecting rods are arranged in one-to-one correspondence with the plurality of second segments. Wherein, the driving mechanism drives the second segment to move through the second connecting rod.

[0007] Further, the driving mechanism includes: a driving cylinder disposed on the mounting sleeve; a turntable rotatably sleeved on the mounting sleeve, and each first connecting rod and each second connecting rod are respectively rotatably connected to the turntable; wherein, the driving cylinder is hinged to the turntable to drive the rotation of the turntable to drive the movement of each first connecting rod and the second connecting rod.

[0008] Further, the turntable is of an annular structure, and the included angle between the first connecting rod and the outer edge of the turntable is smaller than the included angle between the second connecting rod and the outer edge of the turntable.

[0009] Further, a plurality of first connecting plates and a plurality of second connecting plates are provided on the turntable. Among them, each first connecting plate is respectively hinged to each first connecting rod, and each second connecting plate is respectively hinged to each second connecting rod. The distance from the hinged position of the first connecting plate and the first connecting rod to the center of the turntable is greater than the distance from the hinged position of the second connecting plate and the second connecting rod to the center of the turntable.

[0010] Further, the first slip chuck is of a sector structure, and the second slip chuck is of a trapezoidal structure. When the chuck assembly is in the avoidance position or the positioning position, a plurality of first slip chucks and a plurality of second slip chucks cooperate with each other to form an annular structure.

[0011] Further, the chuck assembly further includes: a mounting plate disposed around the outer side of the mounting sleeve; a plurality of tracks disposed around the mounting plate, wherein the tracks extend along the radial direction of the mounting sleeve, and each first slip chuck and the second slip chuck are respectively movably disposed on the corresponding tracks.

[0012] Further, the forming drum further includes: an annular capsule connected to the chuck assembly to cover the part of the chuck assembly inserted into the carcass tube when the chuck assembly is in the positioning position, and / or a plurality of gaskets, each gasket is respectively disposed between adjacent first slip chucks and second slip chucks to seal the gap between the first slip chuck and the second slip chuck when the chuck assembly is in the positioning position.

[0013] According to another aspect of the present invention, there is provided a forming drum including two chuck structures, the two chuck structures are relatively spaced apart and form a positioning space therebetween to fix the carcass tube in the positioning space, wherein the chuck structure is the above-mentioned chuck structure.

[0014] The chuck structure of the technical solution of the present invention is mainly used on a forming drum or winding drum for manufacturing tires, and is used to position the carcass tube. The mounting sleeve of the chuck structure adopts a circular sleeve structure, which is fixed in the horizontal direction, and the chuck assembly is arranged around the mounting sleeve. When the carcass tube is transferred to the forming drum, the chuck assembly first contracts to a avoidance position along the radial direction of the mounting sleeve. At this time, the radius of the chuck assembly in the radial direction is smaller than the radius of the inner side of the carcass tube, so that the carcass tube can pass through the chuck assembly along the mounting sleeve and enter between the two chuck structures. After the carcass tube enters between the two chuck structures, the chuck structure extends to a positioning position along the radial direction of the mounting sleeve. At this time, the radius of the chuck structure in the radial direction is larger than the radius of the inner side of the carcass tube, which limits the carcass tube and prevents it from moving left and right. The present invention enables the carcass tube to be smoothly installed, positioned and disassembled by providing a chuck with an expansion and contraction structure, avoids the problem of disassembling the chuck structure, saves time and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 A schematic diagram showing a carcass tube being inserted into a building drum according to an embodiment of the building drum of the present invention is shown;

[0017] Figure 2 A schematic diagram showing an embodiment of the chuck structure of the present invention in an avoidance position is shown;

[0018] Figure 3 A schematic diagram showing the inflated positioning of the carcass tube in an embodiment of the building drum of the present invention is shown;

[0019] Figure 4 A schematic diagram showing an embodiment of a chuck structure using an annular capsule according to the present invention in a positioning position is shown;

[0020] Figure 5 A schematic diagram showing an embodiment of a chuck structure using a sealing gasket according to the present invention in a positioning position is shown;

[0021] Figure 6 Shown Figure 1 Cross-section of the building drum.

[0022] The above drawings include the following reference numerals:

[0023] 10. Mounting sleeve; 20. Carcass cylinder; 30. Chuck assembly; 31. First slip; 32. Second slip; 41. First connecting rod; 42. Second connecting rod; 43. Driving cylinder; 44. Turntable; 441. First connecting plate; 442. Second connecting plate; 51. Mounting plate; 52. Track; 60. Annular capsule; 70. Gasket. Detailed implementation manners

[0024] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] In order to solve the problem of low matching efficiency between the existing forming drum and the carcass cylinder 20, the present invention provides a chuck structure and a forming drum.

[0026] Please refer to Figures 1 to 6 , the present invention provides a chuck structure for positioning the carcass cylinder 20 on the forming drum. The chuck structure includes a mounting sleeve 10 and a chuck assembly 30. The chuck assembly 30 is arranged on the mounting sleeve 10 in a telescopable manner. Among them, the chuck assembly 30 has a retracted position and a positioning position. When the chuck assembly 30 contracts to the retracted position, the carcass cylinder 20 can pass through the chuck assembly 30, and when the chuck assembly 30 expands to the positioning position, the carcass cylinder 20 is fixed on the forming drum.

[0027] The chuck structure of the present invention is mainly applied to the forming drum or winding drum for manufacturing tires to position the carcass cylinder 20. The mounting sleeve 10 of the chuck structure adopts a circular sleeve structure and is fixed in the horizontal direction. The chuck assembly 30 is arranged around the mounting sleeve 10. When the carcass cylinder 20 is transferred to the forming drum, the chuck assembly 30 first contracts along the radial direction of the mounting sleeve 10 to the retracted position. At this time, the radius of the chuck assembly 30 in the radial direction is smaller than the inner radius of the carcass cylinder 20, so that the carcass cylinder 20 can pass through the chuck assembly 30 along the mounting sleeve 10 and enter between two chuck structures. After the carcass cylinder 20 enters between two chuck structures, the chuck structure extends along the radial direction of the mounting sleeve 10 to the positioning position. At this time, the radius of the chuck structure in the radial direction is larger than the inner radius of the carcass cylinder 20, which plays a limiting role on the carcass cylinder 20 to prevent it from moving left and right. By setting a chuck with a telescopic structure, the present invention enables the carcass cylinder 20 to be smoothly installed, positioned and disassembled, avoids the problem of disassembling and assembling the chuck structure, saves time and improves efficiency.

[0028] The chuck assembly 30 includes a plurality of first slips 31 and a plurality of second slips 32. The plurality of first slips 31 are arranged at intervals around the mounting sleeve 10, and each first slip 31 is arranged to be telescopically movable in the radial direction of the mounting sleeve 10; the plurality of second slips 32 are arranged at intervals around the mounting sleeve 10, and each second slip 32 is arranged to be telescopically movable in the radial direction of the mounting sleeve 10; wherein, the plurality of first slips 31 and the plurality of second slips 32 are arranged alternately in sequence. The turntable 44 is provided with a plurality of first connecting plates 441 and a plurality of second connecting plates 442. Among them, each first connecting plate 441 is hinged to each first connecting rod 41 in a one-to-one correspondence, and each second connecting plate 442 is hinged to each second connecting rod 42 in a one-to-one correspondence. The distance from the hinge position of the first connecting plate 441 and the first connecting rod 41 to the center of the turntable 44 is greater than the distance from the hinge position of the second connecting plate 442 and the second connecting rod 42 to the center of the turntable 44. The turntable 44 is of an annular structure, and the angle between the first connecting rod 41 and the outer edge of the turntable 44 is smaller than the angle between the second connecting rod 42 and the outer edge of the turntable 44.

[0029] The chuck assembly 30 in this embodiment is an annular structure formed by alternately arranging a plurality of first slips 31 and a plurality of second slips 32 in sequence. In order to facilitate contraction and expansion, the present invention provides two implementation manners as follows:

[0030] According to an embodiment of the present invention, the moving times of the first slips 31 and the second slips 32 are set differently through the control system. Specifically, when contracting or expanding, the second slips 32 can be made to move first and then the first slips 31, so that structural avoidance can be achieved.

[0031] According to another embodiment of the present invention, the first slip 31 and the second slip 32 can be moved at the same time, but the moving speed of the second slip 32 is faster than that of the first slip 31 to ensure the telescopic movement of the ring. Specifically, the angle between the first connecting rod 41 and the outer edge of the turntable 44 is smaller than the angle between the second connecting rod 42 and the outer edge of the turntable 44. In this way, when the turntable 44 rotates, the smaller the angle, the slower the moving speed of the connecting rod in the radial direction, thereby making the moving speeds of the first slip 31 and the second slip 32 different. At the same time, the length of the first connecting rod 41 is smaller than the length of the first connecting rod 41. The length is greater than the length of the second connecting rod 42, and the radial distances between the hinge position of the first connecting rod 41 and the turntable 44 and the hinge position of the second connecting rod 42 and the turntable 44 are also different. For this purpose, a first connecting plate 441 and a second connecting plate 442 are provided. The first connecting plate 441 and the second connecting plate 442 are fixed on the turntable 44, and the first connecting plate 441 and the second connecting plate 442 are both provided with hinge holes to be connected to the first connecting rod 41 and the second connecting rod 42 respectively. The length of the first connecting plate 441 is greater than the length of the second connecting plate 442.

[0032] The first slips 31 are fan-shaped and the second slips 32 are trapezoidal. When the chuck assembly 30 is in the avoidance position or the positioning position, the plurality of first slips 31 and the plurality of second slips 32 cooperate with each other to form a circular ring structure.

[0033] In order to form a circular ring structure and facilitate contraction and expansion, the first slip 31 is arranged in a fan-shaped structure, and the second slip 32 is arranged in a trapezoidal structure, but the upper and lower sides of the second slip 32 are arc-shaped, so that the first slip 31 and the second slip 32 are combined to form a circular ring.

[0034] The chuck assembly 30 further includes a drive mechanism, a plurality of first connecting rods 41, and a plurality of second connecting rods 42. The plurality of first connecting rods 41 are respectively connected to the drive mechanism, and the plurality of first connecting rods 41 are provided in a one-to-one correspondence with the plurality of first slips 31. The drive mechanism drives the first slips 31 to move via the first connecting rods 41. The plurality of second connecting rods 42 are respectively connected to the drive mechanism, and the plurality of second connecting rods 42 are provided in a one-to-one correspondence with the plurality of second slips 32. The drive mechanism drives the second slips 32 to move via the second connecting rods 42. The drive mechanism includes a drive cylinder 43 and a rotary disk 44. The drive cylinder 43 is provided on the mounting sleeve 10. The rotary disk 44 is rotatably mounted on the mounting sleeve 10. Each of the first connecting rods 41 and each of the second connecting rods 42 is rotatably connected to the rotary disk 44. The drive cylinder 43 is hingedly connected to the rotary disk 44 to drive the rotation of the rotary disk 44 to drive each of the first connecting rods 41 and the second connecting rods 42 to move.

[0035] In this embodiment, two driving cylinders 43 are used to jointly drive the turntable 44 to rotate. The driving cylinders 43 are arranged on the mounting plate 51, and the driving cylinders 43 are drivingly connected to the turntable 44, so as to drive the turntable 44 to rotate reciprocally. The whole movement step is as follows: the driving cylinder 43 drives the turntable 44 to rotate, and the first connecting plate 441 and the second connecting plate 442 on the turntable 44 drive the first connecting rod 41 and the second connecting rod 42 to move, thereby causing the first jaw 31 and the second jaw 32 to perform radial contraction and expansion movements.

[0036] The chuck assembly 30 further includes a mounting plate 51 and a plurality of tracks 52. The mounting plate 51 is arranged around the outer side of the mounting sleeve 10; the plurality of tracks 52 are arranged around the mounting plate 51. Among them, the tracks 52 extend along the radial direction of the mounting sleeve 10, and each of the first jaws 31 and the second jaws 32 is movably arranged on the corresponding track 52.

[0037] The mounting plate 51 is an annular plate sleeved on the outer side of the mounting sleeve 10. The first jaws 31 and the second jaws 32 move radially along the tracks 52 on the mounting plate 51, ensuring the movement accuracy of each of the first jaws 31 and the second jaws 32.

[0038] According to one embodiment, as Figure 4 shown, when stamping the inner side of the carcass drum, it is necessary to ensure the closure between the carcass drum and the forming drum. For this purpose, the forming drum further includes an annular capsule 60. The annular capsule 60 is connected to the chuck assembly 30 so as to cover the part of the chuck assembly 30 inserted into the carcass tube 20 when the chuck assembly 30 is in the positioning position. Before pressurizing the inner side of the carcass drum, the annular capsule 60 is pressurized first, so that the capsule covers the part of the chuck assembly 30 inserted into the carcass drum after bulging, preventing air leakage caused by gaps on the chuck assembly 30.

[0039] In addition, as Figure 5 shown, the present invention can also seal the chuck assembly 30 by setting a plurality of gaskets 70. Specifically, each of the gaskets 70 is respectively arranged between adjacent first jaws 31 and second jaws 32 to seal the gap between the first jaws 31 and the second jaws 32 when the chuck assembly 30 is in the positioning position. During installation, the gasket 70 can be prefabricated on both sides of the first jaw 31 or both sides of the second jaw 32. The gasket 70 is an elastic rubber gasket, and the sealing performance is better.

[0040] The present invention also provides a forming drum, including two chuck structures. The two chuck structures are arranged opposite to each other at intervals and form a positioning space therebetween, so that the carcass tube 20 is fixed in the positioning space. Among them, the chuck structure is the above-mentioned chuck structure.

[0041] The chuck structure of the present invention can be applied to different drums for positioning the carcass cylinder 20 or the tire carcass, such as a shaping drum or a winding drum. Only one of the above two chuck structures can adopt a chuck structure capable of expanding and contracting movement, or both can adopt a chuck structure capable of expanding and contracting movement. The specific setting depends on the needs of the forming drum.

[0042] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0043] The chuck structure of the present invention is mainly applied to the forming drum or winding drum for manufacturing tires and is used to position the carcass cylinder 20. The mounting sleeve 10 of the chuck structure adopts a circular sleeve structure and is fixed in the horizontal direction. The chuck assembly 30 is arranged around the mounting sleeve 10. When the carcass cylinder 20 is transferred to the forming drum, the chuck assembly 30 first contracts in the radial direction of the mounting sleeve 10 to the avoidance position. At this time, the radius of the chuck assembly 30 in the radial direction is smaller than the radius inside the carcass cylinder 20, so that the carcass cylinder 20 can pass through the chuck assembly 30 along the mounting sleeve 10 and enter between the two chuck structures. After the carcass cylinder 20 enters between the two chuck structures, the chuck structure extends in the radial direction of the mounting sleeve 10 to the positioning position. At this time, the radius of the chuck structure in the radial direction is larger than the radius inside the carcass cylinder 20, which plays a limiting role on the carcass cylinder 20 to prevent it from moving left and right. By setting the chuck with an expansion and contraction structure, the present invention enables the carcass cylinder 20 to be smoothly installed, positioned and disassembled, avoids the problem of disassembling and assembling the chuck structure, saves time and improves efficiency.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0045] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary statements, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0047] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationships of one device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0048] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without otherwise stating, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A chuck structure for positioning a carcass tube (20) on a forming drum, characterized in that, The chuck structure includes: An installation sleeve (10); A chuck assembly (30) which is telescopically arranged on the installation sleeve (10). Wherein, the chuck assembly (30) has an avoidance position and a positioning position, so that when the chuck assembly (30) contracts to the avoidance position, the carcass cylinder (20) can pass through the chuck assembly (30), and when the chuck assembly (30) expands to the positioning position, the carcass cylinder (20) is fixed on the forming drum; The chuck assembly (30) includes: A plurality of first jaws (31) and a plurality of second jaws (32). The plurality of first jaws (31) and the plurality of second jaws (32) are alternately arranged around the installation sleeve (10) in sequence, and each of the first jaws (31) and each of the second jaws (32) are telescopically arranged along the radial direction of the installation sleeve (10); A driving mechanism; A plurality of first connecting rods (41) and a plurality of second connecting rods (42), and the plurality of first connecting rods (41) and the plurality of second connecting rods (42) are respectively connected to the driving mechanism; The plurality of first connecting rods (41) are arranged in one-to-one correspondence with the plurality of first jaws (31), and the driving mechanism drives the first jaws (31) to move through the first connecting rods (41); The plurality of second connecting rods (42) are arranged in one-to-one correspondence with the plurality of second jaws (32), and the driving mechanism drives the second jaws (32) to move through the second connecting rods (42); The driving mechanism includes: A turntable (44) which is rotatably sleeved on the installation sleeve (10), and each of the first connecting rods (41) and each of the second connecting rods (42) are respectively rotatably connected to the turntable (44); The turntable (44) is of an annular structure, and the included angle between the first connecting rod (41) and the outer edge of the turntable (44) is smaller than the included angle between the second connecting rod (42) and the outer edge of the turntable (44); The first jaw (31) is of a fan-shaped structure, and the second jaw (32) is of a trapezoidal structure.

2. The chuck structure according to claim 1, wherein, The driving mechanism includes: A driving cylinder (43) which is arranged on the installation sleeve (10); wherein, the driving cylinder (43) is hinged to the turntable (44) to drive the turntable (44) to rotate and drive each of the first connecting rods (41) and the second connecting rods (42) to move.

3. The chuck structure according to claim 1, characterized in that, A plurality of first connecting plates (441) and a plurality of second connecting plates (442) are arranged on the turntable (44). Wherein, each of the first connecting plates (441) is hinged to each of the first connecting rods (41) in one-to-one correspondence, and each of the second connecting plates (442) is hinged to each of the second connecting rods (42) in one-to-one correspondence. The distance from the hinged position of the first connecting plate (441) and the first connecting rod (41) to the center of the turntable (44) is greater than the distance from the hinged position of the second connecting plate (442) and the second connecting rod (42) to the center of the turntable (44).

4. The chuck structure according to claim 1, wherein When the chuck assembly (30) is in the avoidance position or the positioning position, a plurality of the first jaws (31) and a plurality of the second jaws (32) cooperate with each other to form an annular structure.

5. The chuck structure according to claim 1, characterized in that, The chuck assembly (30) further includes: a mounting plate (51) disposed around the outer side of the mounting sleeve (10); a plurality of tracks (52) disposed around the mounting plate (51), wherein the tracks (52) extend in the radial direction of the mounting sleeve (10), and each of the first jaws (31) and the second jaws (32) is movably disposed on the corresponding track (52).

6. The chuck structure according to claim 1, wherein, The forming drum further includes: an annular capsule (60) connected to the chuck assembly (30) to cover a portion of the chuck assembly (30) inserted into the carcass tube (20) when the chuck assembly (30) is in the positioning position, and / or a plurality of gaskets (70) respectively disposed between adjacent first jaws (31) and second jaws (32) to seal a gap between the first jaws (31) and the second jaws (32) when the chuck assembly (30) is in the positioning position.

7. A forming drum, characterized in that, It includes two chuck structures, the two chuck structures are relatively spaced apart and form a positioning space therebetween to fix the carcass tube (20) in the positioning space, wherein the chuck structure is the chuck structure according to any one of claims 1 to 6.

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