RU2305020C2 - Installation for melting pattern composition and for roasting molds at casting with use of investment patterns - Google Patents

Abstract

FIELD: foundry.

SUBSTANCE: installation includes gas furnace, vertically closed chain conveyer, mechanism for loading two-seat ceramic pans to furnace; inclined and vertical reloaders of pans. Loading mechanism provides pushing of pan with molds to roasting furnace while simultaneously moving all pans in furnace. In furnace are realized: pattern composition melting; heating and roasting of molds. At outlet of furnace mold is taken-off from pan and inclined reloader shifts empty pan to vertically closed chain conveyer arranged under furnace. Conveyer returns pans to starting portion of furnace. Vertical reloader shifts pan upwards to mold loading position. Installation is also provided with accumulating conveyer being in the form of horizontally closed chain conveyer having pins for mounting molds.

EFFECT: lowered labor consumption, improved operational condition, stable quality of molds.

2 cl, 3 dwg

Description

The invention relates to the field of foundry, in particular to installations for smelting model composition and firing molds for investment casting.

A known installation for smelting a model composition of ceramic molds, including a centrifugal fan, duct, heat-insulating chamber, electric heater and roll-out trolley, having a drive and a heat-insulating wall with a monorail mounted on it from the side of the chamber with carriage rollers resting on it, having a bearing assembly with a hook, on which a disk with a tensioned chain and a multi-place pendant for molds are fixed, curtains that are hinged to the heat-insulating wall, in contact with the stops located in the chamber, a suspension swing drive mounted on a heat-insulating wall and additionally mounted on the outside of the camera monorail for receiving and dispensing suspensions with ends fixed on hinges and connected to mounted pneumatic cylinders (application for invention No. 97119715 A, IPC V22C 9/04, publication 1999 09.10.10 )

The reasons that impede the application of the indicated technical solution are the need to use additional equipment for firing molds, a significant increase in the technological cycle, a decrease in productivity, and an increase in labor intensity and occupied space.

There is also a known production line for smelting and calcining molds in investment casting, including parallel-mounted heating chambers for smelting and calcination, connected by a common suspended horizontally-closed chain conveyor passing through the chambers, with suspensions for setting molds (USSR, A.V. No. 298419, IPC В22С 9/04, publ. BI No. 11, 03.16.1971).

The reasons that prevent the widespread use of this design are: the use of an overhead chain conveyor with pendants for setting molds, suggests the presence of a gap in the arch of the heating chamber, which significantly increases heat loss; the presence of two parallel located smelting and calcining chambers, combined by a conveyor with a drive and a tension chain, significantly increases the dimensions. In addition, the presence of rotary devices in the chain conveyor does not allow a minimum distance between the suspensions (molds), which significantly reduces the productivity of the installation and increases the volume of the furnace space.

The closest in technical essence and the achieved technical result is the installation for smelting the model composition and firing molds for investment casting, containing a continuous gas furnace and a vertically closed chain conveyor, and the furnace is equipped with a compartment for melting models with copiers installed in it, when interacting with special the mechanisms of the conveyor provided oscillatory motion of the forms (SU No. 484934 A, B22D 29/00, 03/03/1975).

The installation provides improved quality of smelting and increased productivity.

The disadvantage that prevents the widespread use of this design is the use of manual labor when installing the molds, which does not ensure the stability of the process parameters that affect the quality of the molds.

An object of the invention is to eliminate this drawback, namely the creation of an installation that provides the exception of manual labor when installing forms and loading them into the furnace.

The technical result from the use of the proposed technical solution is to reduce the complexity and improve working conditions while ensuring a stable quality of the molds.

The specified technical result is achieved due to the fact that the installation for smelting the model composition and firing molds on investment casting, containing a continuous gas furnace and a vertically closed chain conveyor, is equipped with two-slot ceramic pallets for setting molds, a mechanism for loading pallets into the furnace, an inclined pallet reloader, a vertical reloader pallets, while a vertically closed chain conveyor is located under the furnace, and reloaders are located at the ends of the furnace and vertically closed o chain conveyor for moving pallets, respectively, from the furnace to the conveyor and from the conveyor to the loading mechanism. In addition, the installation is equipped with a conveyor-drive, made horizontally closed, with pins for mounting forms.

Providing the installation with a mechanism for loading pallets into the furnace, an inclined pallet reloader, a vertical pallet reloader ensures the exclusion of manual labor when installing, loading and unloading them, the use of two-nest ceramic pallets allows for a more stable position of the molds during transportation while increasing labor productivity. The location of a vertically closed chain conveyor (the mechanism for moving pallets) under the furnace reduces the time spent in the open air, which ensures stabilization of the process parameters. A vertically closed chain conveyor provides a mechanized return of pallets to the beginning of the furnace. The use of a vertically closed conveyor, rather than a horizontally closed conveyor, avoids complicating the design in the form of five gear drives with fixation.

In aggregate, this design allows you to eliminate the direct participation of the worker in each installation cycle, reduce the operator’s unproductive hard labor, and increase technological stability by automating the process.

Figure 1 presents a General view of the installation in section; in Fig.2 is a view along arrow A, in Fig.3 is a section along BB, where

1 - gas passage furnace, 2 - conveyor storage, 3 - rotary manipulator with tongs, 4 - loading mechanism, 5 - vertically closed chain conveyor, 6 - vertical reloader, 7 - inclined reloader, 8 - separator tank, 9 - pallet, 10 - loading flap, 11 - unloading flap, 12 - control cabinet.

Installation works as follows.

Model-ceramic blocks are installed on the pins of the conveyor drive 2 by the pouring bowl down. After heating the furnace to an outlet temperature of ~ 700 ° C, by command of the control system, the molds are automatically loaded into the gas passage furnace 1 as follows. The double tick grip of the rotary manipulator 3 moves to the conveyor drive 2, goes down and grabs two model-ceramic blocks at once, raises them up by the size of the pin, thereby removing them from the pins, and rotates 90 °. Then, when descending, the paired tick grip installs two blocks in the sockets of the pallet 9, located in front of the loading flap of the furnace 10. After releasing the tick grippers, both flaps of the furnace open and the loading mechanism 4 pushes the pallet 9 into the furnace, while moving all 14 pallets in the furnace by the size of the pallet . At the exit, the pallet moves to the inclined reloader 7. The forks of the inclined reloader, dropping down, install an empty pallet onto the vertically closed chain pallet return conveyor 5, which moves the pallet to the forks of the vertical reloader 6 before the furnace starts. Next, the vertical reloader 6 moves the pallet up to the installation position two forms in front of the loading flap 10. In accordance with the cyclogram, after 3 minutes the cycle is repeated, thus the furnace is completely filled with blocks and then controlled by the operator to ory opens the discharge valve 11 and the series takes another form. At the first 3 positions after loading the molds from thermal shock, the model composition is smelted. The model composition flows through the openings in the pallet into the water separator tank 8. As the molds move towards the exit from the furnace, the molds are further heated and fired. The temperature control system and control mechanisms are located in the control cabinet 12.

Claims (2)

1. Installation for smelting the model composition and firing molds on investment casting, containing a continuous gas furnace and a vertically closed chain conveyor, characterized in that it is equipped with two-slot ceramic pallets for setting molds, a mechanism for loading pallets into the furnace, an inclined pallet reloader, a vertical pallet reloader while a vertically closed chain conveyor is located under the furnace, and reloaders are located at the ends of the furnace and a vertically closed chain conveyor to move I pallets, respectively, from the furnace to the conveyor and from the conveyor to the loading mechanism. 2. Installation according to claim 1, characterized in that it is equipped with a conveyor-drive, made horizontally closed with pins for setting the forms.

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