Forming drum of small tire

Abstract

The utility model discloses a forming drum of a small tire, which comprises a central shaft and a forming drum surface, the forming drum surface is sleeved on the central shaft through a locking component, and a mounting ring groove for mounting the forming drum surface is arranged in the middle of the central shaft. A circle of contact protrusion used for making contact with a tire body cord fabric is arranged in the middle of the forming drum face in a protruding mode, and a circle of groove facing the contact protrusion and used for achieving reverse wrapping in the subsequent process is formed in a step between the contact protrusion and the forming drum face. When the forming drum is used in an existing forming machine, the problems of incapability of normally expanding and folding the drum, steel wire collision, difficulty in forward and reverse wrapping and the like due to small diameter of a tire blank can be solved, so that the forming drum can be used for forming tires of 6 inches and below; and meanwhile, the forming drum surface consists of a plurality of tiles, namely the forming drum is in a split type, so that the forming drum is convenient to mount and replace.

Description

Technical Field

[0001] The utility model belongs to the technical field of small tire molding tooling, in particular to a small tire molding drum. Background Art

[0002] In tire manufacturing, the building drum is the primary tool for tire assembly. However, the current tire assembly process is limited to larger tires, using processes such as inflating the carcass cord through a bladder, turning it up, attaching it to the wire, and unloading the tire. For tires 6 inches and smaller, the small diameter of the tire blank and the wire bead make unloading inconvenient and also prone to problems such as adhesion within the tire. Therefore, there are currently no building drums suitable for tires 6 inches and smaller. Utility Model Content

[0003] The utility model proposes a small tire building drum, which can be used for building tires of 6 inches and below, and avoids problems such as failure to properly expand and fold the drum, collision with steel wire, and difficulty in front and back packing due to the small diameter of the tire blank.

[0004] To this end, the technical solution adopted by the present invention is: a forming drum for small tires, comprising a central axis and a forming drum surface, the forming drum surface being mounted on the central axis through a locking assembly, the middle part of the central axis being provided with a mounting ring groove for mounting the forming drum surface, the middle part of the forming drum surface being provided with a circle of contact protrusions for contacting the carcass cord, and a circle of grooves facing the contact protrusions and used for realizing reverse packaging in subsequent processes being provided on the step between the contact protrusions and the forming drum surface.

[0005] As a preferred embodiment of the above scheme, the forming drum surface includes a plurality of arc-shaped tiles and two locking rings for fixing the tiles to form the forming drum surface. A small section of locking ring external thread is provided at both ends of each tile. When all the tiles are combined together, a complete locking ring external thread for locking ring installation can be formed at both ends.

[0006] Further preferably, each tile is provided with an identification for indicating the size of the tire that the tile can form and the order in which the tiles can be installed.

[0007] Further preferably, limiting protrusions are provided at positions near both ends of the forming drum surface, and the outer diameter of the limiting protrusions is smaller than that of the contact protrusions.

[0008] Further preferably, the locking assembly includes a fastening ring, and locking external threads for installing the fastening ring are provided at both ends of the mounting ring groove on the central axis, and the fastening ring can be pressed against both ends of the forming drum surface after installation.

[0009] Further preferably, the locking ring and the fastening ring are integrated.

[0010] Further preferably, a connecting sleeve for mounting on a head and neck of a molding machine is provided on one end of the central shaft, the connecting sleeve is connected to the central shaft via a threaded connection, and a mounting hole for mounting the head and neck is provided on the connecting sleeve.

[0011] Further preferably, the central shaft is configured as a hollow shaft.

[0012] The beneficial effects of the utility model are as follows: when used in an existing building machine, it can solve the problems of being unable to normally stretch and fold the drum, hitting the steel wire, and difficulty in front and back wrapping due to the small diameter of the tire blank, so that the building drum can be used for the building of tires of 6 inches and below; at the same time, the building drum surface is composed of multiple tiles, that is, the building drum is set to a split type, which is convenient for installation and replacement of the building drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the present utility model.

[0014] Figure 2 It is a schematic diagram of the central axis of the present invention.

[0015] Figure 3 It is a schematic diagram of the forming drum surface in the present invention.

[0016] Figure markings: center axis-1, mounting ring groove-1a, locking external thread-1b, forming drum surface-2, contact protrusion-2a, groove-2b, locking ring external thread-2d, limiting protrusion-2e, locking ring-3, fastening ring-4, connecting sleeve-5. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the following embodiments and accompanying drawings:

[0018] like Figure 1-3 As shown, a small tire building drum primarily consists of a center shaft 1, a building drum surface 2, and a locking assembly. The building drum surface 2 is mounted on the center shaft 1 via the locking assembly. To facilitate center shaft installation, a mounting groove 1a for the building drum surface 2 is provided in the center of the center shaft 1. To facilitate machining and ensure the accuracy of the surface contacting the carcass cord, a circle of contact protrusions 2a is provided in the center of the building drum surface 2 for contact with the carcass cord. Furthermore, a circle of grooves 2b, facing toward the contact protrusions 2a and used for reverse wrapping in subsequent processing steps, is provided on the step between the contact protrusions 2a and the building drum surface 2.

[0019] To facilitate assembly and disassembly of the drumhead, the drumhead 2 includes multiple curved tiles and two locking rings 3 that secure the tiles together to form the drumhead. To facilitate installation, each tile has a small section of locking ring external thread at each end. When all the tiles are assembled, a complete locking ring external thread 2d is formed at each end for locking ring installation.

[0020] In order to ensure that the locking ring external threads 2d can be formed smoothly at both ends after the tiles are assembled, each tile 2c is provided with a mark indicating the corresponding tire size that the tile can form and the tile installation order.

[0021] In order to limit the tightening position of the locking ring and prevent it from interfering with subsequent processes, a limiting protrusion 2e is set near the two ends of the forming drum surface 2, and the outer diameter of the limiting protrusion 2e is smaller than the contact protrusion 2a, that is, a small limiting protrusion is set on each tile.

[0022] The locking assembly includes a fastening ring 4, and locking external threads 1b for installing the fastening ring are provided at both ends of the mounting ring groove on the central shaft 1. After installation, the fastening ring 4 can rest against the two ends of the forming drum surface 2. It is best that the fastening ring rests on the locking ring. At this time, the fastening ring and the locking ring can be set as one piece.

[0023] In order to facilitate the installation of the center shaft on the molding machine, a connecting sleeve 5 for installation on the head and neck of the molding machine is provided on one end of the center shaft 1, and the connecting sleeve and the center shaft are connected by a threaded connection. Correspondingly, a mounting hole for installing the head and neck is provided on the connecting sleeve. At this time, only one fastening ring can be provided, so that the connecting sleeve also has the function of a fastening ring, or only one locking ring can be provided, so that the connecting sleeve also has the function of a locking ring.

[0024] In order to reduce weight, the central shaft 1 is set as a hollow shaft.

[0025] During operation, the drum is mounted on the main shaft of the building machine via the neck, and the drum surface is installed (of course, the drum surface can also be installed first). During tire building, the drum rotates first, and then the carcass cord is placed on the drum. As the drum rotates, the tire is compacted, the bead ring is sprayed, the bead is turned up, the tire is fully wrapped, and the tire is applied. Once the tire is compacted and adhered, the tire is complete. To remove the tire, the fastening ring is removed first, followed by the locking ring, to remove the finished tire.

Claims

1. A small tire building drum, characterized in that: The invention comprises a central shaft (1) and a forming drum surface (2), wherein the forming drum surface (2) is sleeved on the central shaft (1) via a locking assembly, wherein a mounting annular groove (1a) for mounting the forming drum surface (2) is provided in the middle of the central shaft (1), a circle of contact protrusions (2a) for contacting with a carcass cord is protruded from the middle of the forming drum surface (2), and a circle of grooves (2b) facing the contact protrusions (2a) and used for realizing reverse wrapping in subsequent processes is provided on the step between the contact protrusions (2a) and the forming drum surface (2).

2. The small tire building drum according to claim 1, characterized in that: The forming drum surface (2) comprises a plurality of arc-shaped tiles and two locking rings (3) for fixing the tiles to form the forming drum surface. Both ends of each tile are provided with a small section of locking ring external thread. When all tiles are combined together, complete locking ring external threads (2d) for locking ring installation can be formed at both ends.

3. The small tire building drum according to claim 2, characterized in that: Each tile (2c) is provided with a mark for indicating the size of the tire that the tile can form and the order in which the tiles are installed.

4. The small tire building drum according to claim 1 or 2, characterized in that: The forming drum surface (2) is provided with limiting protrusions (2e) at positions close to both ends, and the outer diameter of the limiting protrusions (2e) is smaller than the contact protrusions (2a).

5. The small tire building drum according to claim 2, characterized in that: The locking assembly comprises a fastening ring (4), and locking external threads (1b) for installing the fastening ring are provided at both ends of the mounting ring groove on the central shaft (1), and the fastening ring (4) can abut against both ends of the forming drum surface (2) after installation.

6. The small tire building drum according to claim 5, characterized in that: The locking ring (3) and the fastening ring (4) are arranged as one body.

7. The small tire building drum according to claim 1, characterized in that: A connecting sleeve (5) for mounting on a head and neck of a molding machine is provided on one end of the central shaft (1); the connecting sleeve and the central shaft are connected via threads; and a mounting hole for mounting the head and neck is provided on the connecting sleeve.

8. The small tire building drum according to claim 1, characterized in that: The central shaft (1) is configured as a hollow shaft.

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