CN111842797A

CN111842797A - Automatic flame heating device for sand mold pouring gate of cold core box molding line

Info

Publication number: CN111842797A
Application number: CN201910377638.XA
Authority: CN
Inventors: 陈洪民; 沙文杰; 朱冬良
Original assignee: Kehua Holdings Co ltd
Current assignee: Kehua Holdings Co ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-10-30

Abstract

The invention relates to an automatic flame heating device for a sand mold sprue of a cold core box molding line, wherein a casting mold is molded by using a cold core box without a heat source and volatile gas polluting air, but when the casting mold is assembled after core assembly, such as a turbocharger volute, the mold filling is incomplete, the cold geye generation rate is more than 15%, the casting mold is graded and preheated by using gas flame, the reject ratio of the casting mold is reduced to 3%, and the casting temperature of molten iron is also reduced to 1520 ℃ from 1590 ℃.

Description

Automatic flame heating device for sand mold pouring gate of cold core box molding line

Technical Field

The flame nozzle facility is used for improving the temperature of a sand mold cavity in the casting industry of cold core box molding.

Background

The castings of the Boge Huana turbocharger 53031017977 volute and the 84515-9 volute of the Garret company are molded by a cold box core shooting machine, the castings are assembled and put on a trolley production line for pouring and cooling, and then are subjected to unpacking and shakeout, the molding sand is molded and put on line by taking polyisocyanate solution and the like as an adhesive and triethylamine as a curing agent, and after the castings are poured at a pouring station, the poor products such as incomplete filling, cold and gege and the like account for about 15 percent, and although the temperature of molten iron is increased to 1590 ℃, the poor products cannot be reduced.

Disclosure of Invention

The invention aims to reduce the cooling gradient when molten iron is poured, and improve the surface temperature of a cavity to keep the molten iron flowing so as to improve the quality of castings.

The technical scheme is that a heating system is additionally arranged at a position which is about 10 meters in front of a pouring station, pipeline gas is used as a heat source, three spray guns are arranged and respectively aim at three pouring gates, flame is sprayed to the pouring gates by the flame spray guns for three times, and the timing is about 10 seconds every time, so that the phenomenon that the pouring gates are cracked due to overlong flame baking time is avoided. A photoelectric switch is arranged beside the trolley, when the trolley transfers the casting mold to pass through the photoelectric switch, light beams of the photoelectric switch are reflected, the cylinder is controlled to open a valve of the spray gun, the spray gun sprays flame to the pouring gate, the valve is closed after the set time, when the casting mold moves to the second station and the third station to stop, a preset cylinder control block is arranged, and the valve of the spray gun is opened, and the second spray gun and the third spray gun start to spray flame to heat the pouring gate.

The invention has the obvious effects that after the casting mould is subjected to flame spraying for three times intermittently, the sprue is prevented from being baked and cracked, the temperature of the inner surface of a cavity can be increased by 10-15 ℃, the pouring temperature of molten iron can be reduced to 1520 ℃, and the incomplete mold filling and the cold gehu phenomenon of the casting are also reduced to about 3 percent from 15 percent.

The selected flame injector is a JZ-50 type spray gun.

The selected photoelectric switch is an LR-E8250AN switch.

Drawings

FIG. 1 is a flame injection system, mounted in place on a production line.

Figure 2 is a schematic view of the lance arrangement.

Fig. 3 is a schematic diagram of the photoelectric control.

Wherein, the device comprises a trolley 1, a trolley 2, a casting mould 3, a photoelectric switch 4, a pipeline gas valve 5, a nozzle 6, a stop dog 7, a cylinder 8, a gas pipeline 9, a compressed air pipeline 10 and a pouring cup

Detailed Description

At one side of moulding line platform truck 1, with high position installation photoelectric switch 3 such as casting mould 2, according to three runner position installation three pipeline gas valve 4 in moulding line top, pipeline gas valve 4 connects flame spout 5 through the metal pipeline, the case switch of pipeline gas valve 4 has dog 6 to control to press down or loosen, dog 6 is connected at the tailpiece of the piston rod of cylinder 7, pipeline gas valve 4 is by gas pipeline 8 and workshop gas pipeline intercommunication, the trachea of cylinder 7 passes through switching-over valve and workshop compressed air intercommunication, three flame spout 5 aims at the runner of three casting mould 2. The signal of the photoelectric switch 3 is communicated with the time relay and the intermediate relay in the control cabinet, and the contact of the intermediate relay is communicated with the reversing valve electromagnet of the cylinder, so that each casting 2 can be sequentially heated by three times of timing flame.

Claims

1. Automatic flame heating device of cold box molding line sand mould runner, characterized by: a heating system is added in front of a casting station, pipeline gas is used as a heat source, flame is sprayed into a casting mold pouring gate by a flame spray gun for three times, and the casting mold pouring gate is intermittently preheated for three times.