Tire heating press

Abstract

A device is used to vulcanize tire blanks and has at least one heatable mold for receiving the tire blank. Furthermore, the device has at least one controllable supply device for a heating medium, which is provided with at least one valve. The valve has a positioning device that is actuated by a liquid fluid.

Claims

1. A device for vulcanization of tire blanks, comprising: at least one heatable mold for receiving the tire blank; at least one controllable supply device for a heating medium, the supply device having one inlet valve and one outlet valve, wherein the inlet valve has a first positioning device that is actuated by a liquid fluid, wherein the outlet valve has a second positioning device that is actuated by the liquid fluid, wherein the first positioning device includes a first piston-cylinder assembly and the second positioning device includes a second piston-cylinder assembly; and a pump to deliver the liquid fluid from a tank to the first and the second piston-cylinder assemblies and for a pressure buildup, wherein the pump is coupled to the tank, and wherein the inlet valve is connected to a first control valve by a first control line for actuating the inlet valve and the outlet valve is connected to a second control valve by a second control line for actuating the outlet valve, wherein the first control valve and the second control valve are 3/2-way valves.

2. The device according to claim 1, wherein the inlet valve has a spring for definition of a normal position.

3. The device according to claim 1, wherein the inlet valve is closed in a normal state.

4. The device according to claim 1, wherein the outlet valve is open in a normal state.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) Illustrative embodiments of the invention are shown schematically in the drawings, in which:

(2) FIG. 1 shows a simplified illustration of a heating press using a column-type heating press as an example, and

(3) FIG. 2 shows a circuit diagram intended to illustrate valve control when using a liquid fluid.

DETAILED DESCRIPTION OF THE INVENTION

(4) FIG. 1 shows the structural design of a heating press (1). The heating press (1) is used to vulcanize the material of a green tire (not shown). To receive the green tire, the heating press (1) has a mold (2) which comprises an upper mold half (3) and a lower mold half (4). In the illustrative embodiment shown, the lower mold half (4) is arranged so as to be immovable. The upper mold half (3) can be positioned in a vertical direction. The mold (2) can be opened and closed by appropriate positioning of the upper mold half (3).

(5) The heating press (1) shown in FIG. 1 is designed as a column-type heating press and has columns (5, 6). Pistons (7, 8), which can be positioned relative to cylinders (9, 10), are used to position the upper mold half (3).

(6) According to another embodiment, the heating press (1) can also be embodied as a frame heating press.

(7) FIG. 2 shows a block circuit diagram intended to illustrate the supply of a heating medium into the area of the mold (2) in order to carry out vulcanization of the green tire there.

(8) An inlet area (21) and an outlet area (22) are used to carry out the schematically illustrated vulcanization process (20). In these areas, the required heating medium is supplied or discharged.

(9) The inlet area (21) is provided with an inlet valve (23), and the outlet area (22) is provided with an outlet valve (24). The valves (23, 24) are typically designed as monostable valves.

(10) In a normal state, when not supplied with a control medium, the inlet valve (23) is closed. The outlet valve (23) is open when not supplied with a control pressure. The respective normal position of the valves (23, 24) is typically achieved by using a spring, against the force of which an applied control pressure operates. Springs of this kind are typically embodied as compression springs.

(11) The inlet valve (23) has a control line (25), and the outlet valve (24) is provided with a control line (26).

(12) A control valve (27) is connected to the control line (25). The control line (26) is provided with a control valve (28).

(13) According to a typical embodiment, the control valves (27, 28) are designed as 3/2-way valves. It is likewise envisaged, in particular, that the control valves (27, 28) are embodied as electrically actuated valves.

(14) The control valves (27, 28) are connected to a tank (31) by supply lines (29, 39). A liquid fluid stored in the tank (31) is typically delivered into the supply lines (29, 39) by a pump (32).

(15) Liquid fluid is fed back into the tank (31) via return lines (33, 34).