SU682204A1 - Working chamber gate for a bread baking oven - Google Patents

Description

one

The invention relates to the baking industry, in particular, to devices for compacting the charging opening of the working (baking) chamber of the baking ovens.

The shutter of the working chamber of the baking oven is known, containing the movable element located at the upper part of the upper part of the chamber and connected to the conveyor hearth drive of the oven with fixed edges of elastic curtains, the lower parts of which are made as separate strips 1.

However, this device does not provide sufficient density to close the mouth of the baking chamber, since the vertical branch of the movable element does not block the entire feed opening of the oven.

The aim of the invention is to increase the closure density of the loading mouth of the working chamber of the baking oven and simplify the design of the gate.

This goal is achieved by the fact that the movable element is designed as a drum provided with radial blades installed transversely to the direction of movement of the hearth with the option of a vrash, and the edges of the shutters are fixed to the blades of the drum. Shutters secured to adjacent blades x

offset by its length by half the width of the sagging part of the strip.

FIG. 1 longitudinal section of the oven in the loading area of the dough pieces in the baking chamber; in fig. 2 is a cross-section of the drum shutter of the baking chamber (node I, Fig. 1); on phpg. 3 is a longitudinal section along the axis of the drum (section A-A of FIG. 1); in fig. 4 shows a basic kinematic scheme for driving the rotation of the gate drum.

The shutter 1 is installed in the upper part of the boot ust 2 working (baking) chamber 3 of the oven. Dough blanks 4 are laid on the working branch of the conveyor mesh hearth 5, feeding them into the initial zone of the chamber. Mesh under 5 is equipped with a tension drum 6 with shaft 7.

The shutter is designed as

with the possibility of rotation of the drum 8 (Figs. 2 and 3) with radial blades 9, evenly spaced around the circumference of the drum. On each blade using straps 10 and screws 11 is fixed

Claims (2)

the edge of the elastic curtain 12, made of heat-resistant and anti-adhesive material, such as polytetrafluoroethylene. The lower part of the sagging edge of the shutter 12 is made in the form of separate strips 13. The shutters on adjacent blades x 9 zakreilya and offset by half the width of the strip 13 so that the strip of one curtain is located opposite the junction of the adjacent strips. The drum 8 is provided with cuffs 14, one of which is brought out of the baking chamber 3 and ends with a shank 15 on which a sprocket 16 drives the drive shaft of the drum. The drive of the turner of drum 8 (Fig. 4) connects the shaft 7 of the tension drum 6 of the conveyor netting hearth 5 with the axle shaft 14 of the shutter drum. A drive chain sprocket 17 is mounted on the shaft 7, connected by means of the bush roller chain 18 to the lower intermediate chain sprocket 19. The sprocket 19 is fixed on one shaft 20 with gear 21, which engages with gear 22, intermediate spacing 23, on which is mounted upper intermediate sprocket 24. This sprocket is connected via a chain 25 to the sprocket 16 of a drive for rotating the drum 8 of the baking chamber. The drive is made with a common 1-D gear, providing a circumferential speed of rotation of the ends of the blades 9 (Fig. 2) of the drum 8, equal in magnitude to the linear speed of movement of the mesh hearth 5 with dough pieces 4. The shutter operates as follows. When the mesh hearth 5 (Fig. 1 and 4) with the dough blanks 4 stacked on it moves in the direction indicated by the arrows, the tension drum 6 rotates, transmitting the rotation of the driving sprocket 17 (Fig. 4). The chain 18 transmits rotation through the sprocket 19 to the lower intermediate shaft 20 with gear 21. The latter rotates gear 22 with it, changing the direction of rotation to the opposite. Sitting on the same shaft 23 with the gear 22, an asterisk 24 through the chain 25 transmits the rotation of the sprocket 16 of the rotational drive drum 8 gate. Due to the rotation of the drum 8 with the peripheral speed of the blades 9 (Figs. 2 and 3), equal to the speed of translational movement of the mesh hearth 5, the sagging part of the shutters 12 moves with a speed close to the speed of movement of the dough pieces 4, thereby eliminating the friction of the edge of the curtain o the surface of the workpiece and eliminate the possibility of damage to the surface of the curtain. Thus, the dough blanks 4 (Fig. 1), as they enter the baking chamber 3 of the oven, pass as if through a sluice gate, and the charging opening 2 of the chamber is blocked at the same time by several sagging shutters 12. Closure density is ensured by the fact that the strips 13 (Fig. 3) the sagging part of the neighboring shutters 12 are mixed, the width relative to each other. The technical and economic efficiency of using the gate of the proposed design in baking ovens consists in increasing the density of closing the baking chamber and simplifying the design of the device for sealing the mouth of the chamber. By increasing the closure density of the baking chamber opening, ventilation losses are significantly reduced, as a result of which the heat balance of the oven is improved and, ultimately, the specific fuel consumption during baking is reduced. This is especially important for tunnel kilns with a through-chamber, where due to intensive ventilation of the chamber (up to 30 revolutions per hour), ventilation losses amount to 5-8% of the total heat consumption. Calculations show that increasing the closure density of the baking chamber using the proposed shutter reduces ventilation losses by up to 1–2% of the total heat consumption. Claim 1. The shutter of the working chamber of a baking oven, containing a chamber mouth located in the upper part and a movable element connected to the conveyor floor drive with elastic curtains fixed to it, the lower parts of which are made as separate strips, characterized in that In order to increase the density of the chamber mouth and simplify the design, the movable element is designed as a drum equipped with radial blades mounted transversely to the movement of the hearth rotatably and The edges of the curtains are fixed on the blade of the drum. 2. The closure according to claim 1, characterized in that the shutters are fixed on the adjacent lobes of the drum with an offset along its length by half the width of the lower part of the strip. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 429789, cl. A 21B 3/04, 1971. FIG. 2