SU850695A1 - Tempering bath with fluidized bed - Google Patents

Description

one

The invention relates to mechanical engineering and can be used to heat treat axial parts from structural steels.

A quench-temper conveyor unit is known that contains an electric furnace for heating for quenching, a quenching oil quenching tank, a washing machine, an electric furnace for dispensing products and a cooling chamber 1.

However, the known quenching and tempering unit is very cumbersome, does not provide uniform cooling of parts in quenching oil baths, which causes thermal deformation and residual heat in heat treated parts, requires large gas and power consumption.

The closest technical specification to the present invention is a quenching bath with a fluidized bed, comprising a housing with heaters, a muffle, a fluidization system, an actuator 2.

The disadvantage of this bath is the low productivity and complexity of the design, as well as the impossibility of using it in production lines.

The purpose of the invention is to accelerate the heat treatment cycle and improve reliability.

This goal is achieved by the fact that the bath is equipped with loading and unloading devices installed on the body

10 muffle vertical conveyor with a drive drum, while the loading device is made in the form of stepped perforated trays and stop plates,

15 and the drive drum is placed outside the bath.

FIG. 1 shows schematically a heat treatment line comprising a quenching bath;

20 in FIG. 2 - boot device,.

incision.

The heat treatment line for axial parts made of structural steels consists of a loading mechanism 1 with lot 25 with a compactor 2, a heating device 3 in the form of a furnace for heating for quenching, a quenching bath 4, and a cooling chamber 5.

An electric conveyor for heating for quenching includes a transport conveyor.

thirty

6 and electric heaters 7 and 8, drive 9.

The quenching bath comprises a housing 4, a steel muffle 10, a device 11, a vertical conveyor 12 for transferring axial parts in a fluidized bed of an intermediate grain-cooled heat carrier 13, a device for unloading parts 14, an electric heater 15, air distribution grids 16.

The vertical conveyor 12 includes a drive drum 17, a conveyor belt 18 that guides a copying device 19. A drive drum 17 with a carrying chain 20 is coupled with a 9 line drive. The receiving device 11 is located in the upper fluidization zone of the intermediate fine-grain heat carrier of the guide trays 21 and the leveling stop plates 22.

In the cooling chamber 5, a gravity tilting tray 23 and an air-blown hopper 24 are installed.

An air pipe 26 of the exhaust ventilation system is connected to the upper umbrella 25 of the chamber cooling 5.

Line heat treatment of axial parts of structural steel works as follows.

The heat treatable axial parts from the storage ring 2 by the loading mechanism 1 are supplied with a predetermined cyclops onto the carrier branch of the transport conveyor 6 of the heating electric furnace 3 for quenching. During the residence time in the electric furnace 3, the parts, when moved by the transport conveyor 6, are heated by the heat generated by the electric heaters 7 and 8 to the temperature for quenching, maintained at this temperature for a specified time and removed from the electric furnace, rolling down the transport conveyor 6 to the tray receiver 11.

. In the receiving device 11, the parts move from the heating zone of the electric furnace 3 to the upper layer of the fine-grained heat carrier 13 of the quenching bath 4 and fall into the slots of the vertical conveyor 12. Transferring by means of the conveyor 12 in the fluidized bed of the intermediate fine-grained heat carrier 13

parts are subjected to isothermal quenching at a given temperature and at the end of an isothermal quenching cycle, the device for unloading parts 14 is removed from the conveyor and removed from the quenching bath 4 to the cooling chamber 5.

In the cooling chamber 5, the parts accumulate and. cooled first in gravity tipping tray 23 and then into an air-blown bunker 24.

Industrial use of the proposed bath for heat treatment of axial parts made of structural steels will significantly preserve the laboriousness of heat treatment of parts, improve the quality of heat treatment by improving the metal structure and ensuring deformation-free processing of axial parts, and reduce the cost of gas and electricity for heat treatment of parts. In addition, the proposed device poses, will mechanize and automate the process of heat treatment of axial

5 details and improve the culture of production. .

Formula inventions

A fluidized bed quenching bath containing a body with heaters, a muffle, and a pseudo-liquefaction system, characterized in that, in order to increase reliability of operation and accelerate the heat treatment cycle, it is equipped with loading and unloading devices mounted on the body and placed vertical

conveyor with a drive drum, while the loading device is made in the form of stepped perforated trays and stop bars, and the drive drum

placed outside the bath.

Sources of information taken into account in the examination

1. Conveyor unit OKB-1075. Development of SCR VNIIETO. Inforelectro 12.05.16g70.

2. USSR author's certificate number 557248, cl. F 27 B 15/00, 1975.

Claims (2)

I AM? Claim A quenched fluidized bed containing a housing with heaters, a muffle, and a fluidization system, characterized in that, in order to increase the reliability of operation and accelerate the heat treatment cycle, it is equipped with loading and unloading devices installed on the housing and a vertical conveyor with a drive located inside the muffle drum, while the loading device is made in the form of stepwise arranged perforated trays and thrust bars, and the drive drum is placed outside the bath. Sources of information taken into account during the examination 1. Conveyor unit OKB-1075. Development of hard currency VNIIETO. Inforelectro 05/12/16x70. 2. USSR author's certificate No. 557248, cl. F 27 B 15/00, 1975.