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CN-122029035-A - Central mechanism for tire hot press

CN122029035ACN 122029035 ACN122029035 ACN 122029035ACN-122029035-A

Abstract

The invention relates to a central mechanism (1) for a tire press, wherein the central mechanism (1) comprises a head part (2) for receiving a green tire and for conducting a heating medium, wherein the head part (2) has a cutout for guiding a heating medium line (3) therethrough and a plain bearing arrangement (7) for movable mounting on a well pipe. The central mechanism (1) has a central piston rod (8), wherein the central piston rod (8) is movably mounted to the head part (2).

Inventors

  • Forth, Constantine A.
  • MICHAEL LAMB
  • Holger krone
  • Arne Schlinker

Assignees

  • 大陆轮胎德国有限公司

Dates

Publication Date
20260512
Application Date
20241014
Priority Date
20231018

Claims (7)

  1. 1. A central mechanism (1) for a tire press, wherein the central mechanism (1) comprises a head piece (2) for receiving a green tire and for conducting a heating medium, wherein the head piece (2) has a cutout for guiding a heating medium line (3) therethrough and a sliding bearing arrangement (7) for movable mounting on a well pipe, wherein the central mechanism (1) has a central piston rod (8), wherein the central piston rod (8) movably mounts the head piece (2), characterized in that, The head part (2) comprises a first region (4) for receiving the green tyre and a second region (5) on a side facing away from the green tyre, wherein the first region (4) is thermally decoupled from the second region (5), wherein the sliding bearing arrangement (7) forms a small contact surface area on the well pipe, wherein the central piston rod (8) has a tubular cross section at least in a main region of its main extension axis.
  2. 2. A central mechanism (1) for a tyre hot press according to claim 1, characterized in that a thermal insulating material (6) is arranged between the second zone (5) and the first zone (4) to thermally decouple the second zone from the first zone, the thermal insulating material having a thermal conductivity of less than 0.8W/(m) K) Preferably less than 0.4W/(m) K) More preferably less than 0.2W/(m) K) More preferably less than 0.15W/(m) K) And more preferably less than 0.1W/(m) K)。
  3. 3. A central mechanism (1) for a tyre thermocompressor according to claim 1 or 2, wherein the small contact surface area on the well tubular is less than 1000 cm 2 , preferably less than 600 cm 2 , and more preferably less than 400 cm 2 .
  4. 4. Central mechanism (1) for a tyre hot press according to any one of the preceding claims, wherein the plain bearing arrangement (7) is arranged on the second region (5) of the head piece (2), in particular on the second region (5) of the head piece (2) over its entire extent.
  5. 5. Central mechanism (1) for a tyre hot press according to any one of the preceding claims, wherein the tubular cross section has a polygonal cross section or a circular cross section.
  6. 6. Central mechanism (1) for a tyre hot press according to any one of the preceding claims, wherein the main area of the central piston rod (8) is at least 50%, preferably at least 60% and further preferably at least 70% of the length of the central piston rod (8).
  7. 7. Central mechanism (1) for a tyre hot press according to any one of the preceding claims, wherein the central piston rod (8) is thermally decoupled with respect to the hydraulic cylinder (9), in particular with a thermal conductivity of less than 0.5W/(m) K) Preferably less than 0.3W/(m) K) And further preferably less than 0.2W/(m) K)。

Description

Central mechanism for tire hot press Technical Field The invention relates to a central mechanism for a tire press, wherein the central mechanism has a head part for receiving a green tire and for conducting a heating medium. Background The known central mechanism for tire presses has a head piece, wherein the head piece receives the green tire and the pipeline so that the green tire can be supplied with heating medium. The known head piece is moved in the well tubular via a piston rod, wherein the head piece is mounted on the well tubular by means of a sliding bearing. The central mechanism is not optimized in terms of heat loss, so that in particular the head piece generates high heat losses to its environment, which reduces the energy efficiency of the tire press. Disclosure of Invention Against this background, the object of the present invention is to devise a central mechanism in such a way that the tire press works particularly efficiently and in particular the heat loss of the central mechanism is reduced. This object is achieved by a central mechanism having the features of patent claim 1. The dependent claims relate to particularly advantageous developments of the invention. According to the invention, a central mechanism for a tire press is provided, wherein the central mechanism has a head part for receiving a green tire and for conducting a heating medium, wherein the head part has a cutout for guiding a heating medium line through and a plain bearing arrangement for movable mounting on a well pipe. The central mechanism has a central piston rod, wherein the central piston rod is movably mounted with a head part, wherein the head part has a first region for receiving the green tire and a second region on a side facing away from the green tire. The first region is thermally decoupled from the second region. The sliding bearing arrangement forms a small contact surface area on the well pipe, wherein the central piston rod has a tubular cross section at least in a main region of its main extension axis. Thermal decoupling of the first region of the head piece from the second region of the head piece reduces heat flow from the bellows through the head piece and then to the environment. By thermally decoupled is understood that at least a major proportion of the surface area connecting the first region with the second region has a thermal conductivity of less than 10W/(m)K) In particular less than 5W/(m)K) And preferably less than 1W/(m)K)。 The sliding bearing arrangement, which is formed with a particularly small contact surface area, in particular a contact surface area of less than 1500 cm 2 and preferably a contact surface area of less than 1000 cm 2, reduces the heat flow from the head part into the well pipe and subsequently into the environment. It has been shown that thermal decoupling between the first and second regions of the head piece allows for less heat flow. This is due in particular to the mechanical connection of the two regions and the passage channel of the heating medium line. It has been found that the reduction in thermal conductivity of the central piston rod thus blocks the most relevant heat conduction path that exists so far and thus effectively reduces heat loss. It has been shown that the heat loss from the central mechanism to the environment is only slightly reduced if the insulation measures only block the respective heat conduction path from the head part to the environment. This is due to the fact that the head piece assumes a higher temperature due to the partial insulation present in the second region facing away from the bellows, and thus the heat loss via its waste heat conduction path increases. Thus, it has been shown that the blocking of all relevant heat conduction paths has a significantly greater effect than is achieved by the sum of the respective individual measures. A preferred embodiment provides that the second region is thermally decoupled from the first region by arranging an insulating material between the second region and the first region, the insulating material having a thermal conductivity of less than 0.8W/(m)K) Preferably less than 0.4W/(m)K) More preferably less than 0.2W/(m)K) More preferably less than 0.15W/(m)K) And more preferably less than 0.1W/(m)K) . The arrangement of the highly insulating material in the limited installation space effectively reduces the thermal conductivity through the head member. Another preferred embodiment provides that the small contact surface area on the well pipe is less than 1000 cm 2, preferably less than 600 cm 2, and further preferably less than 400 cm 2. By reducing the contact surface area to the described value, heat loss from the head part to the well tubular is effectively reduced. A further preferred embodiment provides that the plain bearing arrangement is arranged on the second region of the head part, in particular over its entire extent. By arranging the plain bearing arrangement partially or