SU1174715A1 - Heating furnace - Google Patents

Abstract

HEATING OVEN, containing a working chamber with electric heaters, two support shafts, installed in the working chamber vertically in parallel planes with drums placed on them, a transport mechanism in the form of a chain with carriers for parts, drive and tensioning device, that, in order to simplify the design and increase reliability by stabilizing the chain, one of the shafts is mounted obliquely to the other shaft, and the projections of the shafts in the upper part are displaced, each drum is made in the form of tsevyh sections, the riding section is rigidly secured to the shaft, while the other set freely relative to each other, wherein each section corresponds to one of the drum vit (L chain Cove. C

Description

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SP

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The invention is intended for the heat treatment of cylindrical parts, such as springs.

The chain of the invention is to simplify the design and increase reliability by stabilizing the movement of the chain.

FIG. 1 shows a heating furnace, a plan view, FIG. 2, section A-A in FIG. one; in fig. 3 chain link with a carrier fixed on it with the workpiece, in FIG. 4 - shafts with drums mounted on them, spiraling around with a transport chain with carriers for the parts being processed.

The heating furnace includes a housing 1 (Fig. 1 and 2), a cover 2 in which a fan 3 is installed. Inside the working chamber there are two supporting shafts 4 and 5 (Fig. 2), the shaft 5 is installed vertically, and the shaft 4 is inclined to the shaft 5 in such a way that the projections of the shafts in the upper part are crossed.

The shafts are installed in the bearings 6-9 (Fig. 1 and 2) located in the cover 2 and the base of the housing 1 outside the heating zone. Axial loads, acting on the shafts 4 and 5, are completely accepted by the thrust bearings 10 (Fig. 2), located in the lower supports 8 and 9, and the transverse loads are spherical bearings 11 located in the upper 6 and 7 and lower 8 and 9 supports. The mechanism for transporting the workpieces is a closed transport system that includes a traction device in the form of a round link chain 12 (Fig. 3) and a tensioning device 13 located outside the heating zone and an actuator 14 (Fig. 1). The tensioning device 13 for the chain is a system of blocks 15 with a load 16 (Fig. 2).

 An asterisk 18 is rigidly fixed on the drive shaft 17, imparting movement of the chain 12 of the transport mechanism. The chain 12 is fixed with a predetermined pitch carriers for workpieces.

The carrier consists of rigidly bonded sleeves 19 and a support disc.

20 (Fig. 3). Workpieces

21 of a small diameter are loaded inside the sleeve 19; large diameter parts 22 encompass the sleeve

19, and disk 20 in all cases

2

serves as a support for transported parts.

On shafts 4 and 5, the drums 23 and 24 are mounted, which go around the chain 12. The number of turns of the chain 12 depends on the set furnace capacity and the heating time.

Each of the drums 23 and 24 is mounted on the shaft and is a straight circular cylinder made of annular sections 25 and 26, the upper section of each drum is rigidly fixed on the shaft, for example a key 27, and the rest are freely mounted relative to each other, with Thus, each section of the drum receives a rotation around its own axis due to the tension of the turn of the drive chain 12, which envelopes said section. As each point of the drum surface moves along a circle lying in a plane perpendicular to its axis, the horizontal branch in chain 12 (Fig. 4) of the tensioning device 13 attaches to the vertical drum 24 perpendicular to its axis and is set horizontally, then skirting part of the surface of the drum 24, it runs over the drum 23 also perpendicular to its axis, and since the drum 23 is at an angle to the drum 24, the circuit 12 is also set by the angle dod to its horizontal section coming from the tension device, t. e. the chain branch is raised by one step automatically. The next branch of the chain 12, the transition from the inclined drum 23 to the vertical 24, is set again horizontally. Thus, on one side of the axial plane of the shafts, there are a number of horizontal branches of the chain 12, and on the other a series of parallel branches of the chain 12 with an elevation of a step. Moreover, as the coils are removed from the base of the shafts, the pitch of the chain wound in a spiral decreases (the minimum pitch is taken for the calculation).

To unload the parts inside the furnace, under the drive sprocket 18, a tray 28 is provided (Fig. 2), through which the parts are removed from the furnace under their own weight.

The heating furnace works as follows. 3 Before starting work, the heating elements are turned on at an accelerated mode, which heat up the working chamber of the working temperature. The fan 3 circulates the heated air through the working chamber of the furnace, ensuring uniform heating. Upon reaching the set temperature, the heating elements switch to the operating mode. Simultaneously with the heating elements, the mechanism for transporting the processed products is turned on. The chain 12 passage through the chamber is heated. The thermal lengthening of the chain is compensated by the tensioning device 13. When the operating temperature is reached. In the furnace chamber the parts are loaded 5 into carriers fixed to the chain links. As the chain 12 moves in a spiral around the drums 23 and 24, the workpiece is heated to a predetermined temperature. Upon contact of the chain 12c by the drums 23 and 24, the axes of the carriers and, accordingly, the workpieces are located at an angle to the generator of the drum. On the horizontal branch, the chain 12 with the parts to be machined is carried vertically up, and when interacting with the asterisk 18, the chain 12 turns in the vertical plane with the carriers down. The machined parts leave the carrier and enter tray 28, from which, under its own weight, they are removed from the furnace chamber.

Fig.Z g 27

Claims (1)

A HEATING FURNACE containing a working chamber with electric heaters, two support shafts mounted vertically in parallel with planes in the working chamber with drums placed on them, a transport mechanism in the form of a chain with carriers for parts, a drive and a tensioning device, characterized in that, for the purpose of simplifying the design and improving reliability by stabilizing the movement of the chain, one of the shafts is mounted obliquely to the other shaft, and the projections of the shafts in the upper part are crossed, each drum is made in the form of ring with projections, with the upper section fixed to the shaft rigidly, and the rest freely mounted relative to each other, with each section of the drum corresponding to one of the Cove chain.