Tire shaping drum stepless expansion and contraction driving device

Abstract

The invention discloses a tire shaping drum stepless expansion and contraction driving device, which comprises a shaping drum arranged and connected to the front side of a main shaft; the main shaft consists of an inner shaft and an outer shaft; the inner shaft can move in an axial direction so as to actuate the radial expansion and contraction of the shaping drum; the outer shaft can drive the shaping drum to rotate; the back end of the outer shaft is provided and connected with a spiral transmission device used for stepless regulation of the axial movement stroke of the inner shaft; the spiral transmission device comprises a flange which is fixed at the back end of the outer shaft and is used for installing a ball screw; a screw nut of the ball screw is sheathed into the flange and is rotationally matched with the flange; a lead screw of the ball screw is screwed with the screw nut; the front end of the lead screw is fixedly connected with the inner shaft; a displacement sensor usedfor detecting the movement stroke of the inner shaft is arranged in the axial moving direction of the back end of the lead screw; the back part of the main shaft is provided with a first power deviceand a second power device; the first power device can actuate the outer shaft to rotate; the second power device can actuate the screw nut to rotate. The diameter of the shaping drum can be subjectedto stepless expansion and contraction regulation; the production of tires with various different tire diameter specifications or / and different process requirements can be met without changing the shaping drum or a drum plate.

Description

technical field [0001] The invention relates to a building drum for a tire building machine, in particular to a tire building drum stepless expansion and contraction driving device. Background technique [0002] At present, the expansion and contraction of almost all tire building drums in China are driven by air cylinders or directly ventilated to the main shaft; these two driving modes for the expansion and contraction of the forming drum are simple in structure, but there are several disadvantages: ①The drum plate of the forming drum only has the expansion drum and the contraction drum The two extreme positions of the drum, that is to say, a building drum can only produce tires of one specification; when it is necessary to produce tires of other specifications, only the drum plate or the entire building drum can be replaced, which not only reduces production efficiency, but also increases equipment costs; ②It is difficult to adjust the drum plate of the forming drum, and ...

AI Technical Summary

Problems solved by technology

[0002] At present, the expansion and contraction of almost all tire building drums in China are driven by air cylinders or directly ventilated to the main shaft; these two driving modes for the expansion and contraction of the forming drum are simple in structure, but there are several disadvantages: ①The drum plate of the forming drum only has the expansion drum and the contraction drum The two extreme positions of the drum, that is to say, a building drum can only produce tires of one specification; when it is necessary to produce tires of other specifications, only the drum plate or the entire building drum can be replaced, which not only reduces the production efficiency, but also increases the equipment cost; ②It is difficult to adjust the drum plate of the forming drum, and the adjustment range is small. When the diameter required by the tire process is not within the adjustment range, the forming tooling needs to be replaced. The forming process is difficult to realize and causes waste of tooling; If secondary expansion is required during production, it is necessary to purchase a forming drum that can be secondary expanded, which increases production costs

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