JPH0421804Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cooling conveyance device that is part of a manufacturing device for heat-treated glass such as tempered glass or semi-tempered glass.

(Prior Art) Tempered glass or semi-tempered glass is manufactured by blowing cooling air onto the surface of a plate glass that has been heated to near its softening point to generate surface compressive stress on the plate glass.

Tempered glass is obtained by rapidly cooling sheet glass after heating, and when it breaks, it breaks into small pieces. On the other hand, semi-tempered glass reduces the surface compressive stress by slowing down the cooling rate to a rate close to natural cooling, so that when it breaks, it breaks into large pieces, so when it is fitted into a window frame etc. Recently, it has been used as window glass in buildings because it is difficult to break and fall off the window frame.

(Problems to be solved by the invention) In the conventional apparatus described above, the surface of the conveyor roll that conveys the plate glass taken out from the heating furnace while cooling it is coated with inorganic fibers such as glass fibers, aramid fibers, etc. A surface covering material made of organic fibers is provided to prevent distortion caused by the glass coming into contact with the diameter metal.

However, if the glass plate breaks during cooling, the surface coating material will be damaged due to the breakage, and the scratches will be transferred to the subsequent surface of the glass plate. Particularly in the case of semi-tempered glass, the pieces are large and easily damage the surface covering material, and if the temperature at which the glass is taken out from the heating furnace is lowered in order to improve its quality, it becomes more likely to break during cooling.

(Means for solving the problem) In order to solve the above problem, the present invention provides an auxiliary conveyor between the conveyor rolls arranged in the cooling zone of the plate glass, and at least one of the conveyor rolls and the auxiliary conveyor. It can be moved up and down.

(Function) When a glass plate breaks during cooling, the auxiliary conveyor is raised higher than the transport rolls, and the auxiliary conveyor discharges the broken glass plate out of the cooling zone.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is an overall sectional view of a semi-tempered glass manufacturing apparatus to which a cooling conveyance apparatus according to the present invention is applied, and a cooling conveyance apparatus 2 is installed adjacent to a heating furnace 1.

Inside the heating furnace 1, there are provided conveyor rolls 3 for horizontally conveying the plate glass G, and a heater 4 such as a glass burner for heating the plate glass G to near its softening point.

Inside the cooling conveyance device 2, there is a conveyance roll 5 that receives the glass plate G conveyed through the heating furnace 1 and conveys it in a horizontal state, and the upper and lower surfaces of the glass plate G conveyed by the conveyance roll 5 are cooled. A nozzle 6 for blowing air and an auxiliary roll 7 as an auxiliary conveyor located between the transport rolls 5 are provided. Then, one of the transport roll 5 and the auxiliary roll 7 can be raised and lowered, and when the transport roll 5 descends or the auxiliary roll 7 rises, the auxiliary roll 7 becomes higher than the transport roll 5, and the transport roll 5 It is designed to receive the upper plate glass G. In addition, the surface of the conveyor roll 5 is coated with a covering material 8.
covered with. This covering material 8 has a cylindrical shape or a tape shape wound around a roll, and its material is inorganic glass fiber such as glass fiber, silica fiber, or alumina fiber, organic fiber such as aramid fiber, or metal fiber such as stainless steel fiber. However, when producing semi-strengthened glass, it is preferable to use inorganic fibers that have excellent heat resistance and heat insulation properties because the contact time with the glass is longer than that of reinforced glass.

In the above, if a sensor or the like detects that the glass plate G is broken while it is being transported and cooled by the transport roll 5, the transport roll 5 is lowered as shown in FIG. The auxiliary roll 7 is raised, the broken glass piece G is received on the auxiliary roll 7, and the glass piece G' is carried out of the cooling conveyance device 2.

FIGS. 3 and 4 are cross-sectional views showing another embodiment, in which the auxiliary roll 7 is replaced by a roller that runs in a direction perpendicular to the conveyance direction of the plate glass G (perpendicular to the paper surface). An auxiliary belt conveyor 9 is arranged between the conveyor rolls 5. Also in this embodiment, at least one of the transport roll 5 or the auxiliary belt conveyor 9 can be raised and lowered, and under normal conditions, the transport roll 5 is higher than the belt conveyor 9, as shown in FIG. When the plate glass G is broken, the belt conveyor 9 is raised higher than the conveyor roll 5, and the glass pieces G' are discharged from an opening formed on the front side or the rear side of the cooling conveyance device.

(Effects of the invention) As explained above, according to the invention, when heated plate glass is cooled to produce strengthened or semi-tempered glass, if the plate glass cracks due to cooling, an auxiliary conveyor separate from the conveyor rolls is used. Since the broken glass pieces are carried out using a 100-degree heat exchanger, there is no damage to the covering material of the conveyor roll, and even if the heating temperature is low, especially when manufacturing semi-strengthened glass, broken glass pieces will not damage the coating material of the conveyor roll. Semi-tempered glass has an advantage in terms of yield because it does not damage subsequent sheet glass, and as a covering material, it is possible to select materials that emphasize heat resistance and heat insulation rather than wear resistance, and the contact time with the covering material is longer. It is effective in the production of

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a semi-tempered glass manufacturing apparatus using the cooling conveyance device according to the present invention, Fig. 2 is a cross-sectional view showing a method for transporting broken glass using the cooling conveyance device, and Figs. The figure is a sectional view showing another embodiment. In addition, in the drawing, 1 is a heating furnace, 2 is a cooling conveyance device,
5 is a conveyance roll, 7 is an auxiliary roll, 8 is a covering material,
9 is an auxiliary belt conveyor.

Claims (1)

[Scope of utility model registration request] In a cooling conveyance device that blows air onto the top and bottom surfaces of the glass plate while conveying it from a heating furnace using conveyance rolls, the glass plate that is damaged during cooling is conveyed between the conveyance rolls. A cooling conveyance device for sheet glass, characterized in that an auxiliary conveyor is arranged to be movable up and down relative to conveyance rolls.