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Method for heat treatment with a two-position resistance furnace equipped with a time relay and the resistance furnace

A time relay and resistance furnace technology, which is applied in the direction of furnaces, furnace components, furnace control devices, etc., can solve the problems of over-temperature alarm failure of two-position temperature-controlled resistance furnaces, and achieve the effect of improving the pass rate

Active Publication Date: 2018-07-27
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the over-temperature alarm failure problem of the two-position temperature-controlled resistance furnace, and then propose a method for heat treatment using a two-position resistance furnace with a time relay and the resistance furnace

Method used

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  • Method for heat treatment with a two-position resistance furnace equipped with a time relay and the resistance furnace
  • Method for heat treatment with a two-position resistance furnace equipped with a time relay and the resistance furnace
  • Method for heat treatment with a two-position resistance furnace equipped with a time relay and the resistance furnace

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specific Embodiment approach 1

[0024] Specific implementation mode one: combine Figures 1 to 4 Describe this embodiment, the specific steps of a kind of method for carrying out heat treatment with the two-position resistance furnace that is provided with time relay described in this embodiment are:

[0025]Step 1. The load (5) of the two-position temperature-controlled resistance furnace is energized for the first time. When the furnace temperature of the two-position temperature-controlled resistance furnace reaches a given temperature, the load (5) of the two-position temperature-controlled resistance furnace The temperature control module controls the three contactors (3) on the power supply line of the load (5) of the two-position temperature-controlled resistance furnace to be disconnected simultaneously, so as to realize the load (5) of the two-position temperature-controlled resistance furnace Power off, the furnace temperature of the two-position temperature-controlled resistance furnace will conti...

specific Embodiment approach 2

[0030] Specific implementation mode two: combination Figures 1 to 4 Describe this embodiment. This embodiment is a further description of the specific embodiment one. The method for obtaining the delay time parameter of the time relay described in step two is: in the case of a full furnace, the two-position temperature control resistor The load (5) of the furnace is energized for the first time, and when the furnace temperature reaches a given temperature for the first time, the load (5) of the two-position temperature-controlled resistance furnace is powered off; when the furnace temperature continues to rise due to thermal inertia and then falls back When the given temperature is reached, the load (5) of the two-position temperature-controlled resistance furnace is energized and timed, and the furnace temperature continues to drop due to thermal inertia and then continues to control the two-position temperature when it returns to the given temperature. The load (5) of the r...

specific Embodiment approach 3

[0031] Specific implementation mode three: combination Figures 2 to 4 Describe this embodiment. A two-position resistance furnace with a time relay described in this embodiment includes a 3-phase knife switch (1), 3 fuses (2), and 3 contactors (3) simultaneously and the load (5) of the two-position temperature-controlled resistance furnace, one end of the 3-phase knife switch (1) is connected to each phase of the three-phase AC power supply; the other end of the 3-phase knife switch (1) is sequentially One end of the three fuses (2) is connected, and the other end of the three fuses (2) is sequentially connected to one end of the three contactors (3) at the same time; the three contactors (3) are simultaneously The other end of the two-position resistance furnace is connected to the power supply input end of the load (5) in turn; the two-position resistance furnace with a time relay also includes 3 time relays (4) and 3 acousto-optic The alarm module (7), the live wire termi...

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Abstract

The invention discloses a method for carrying out thermal treatment on a two-position type resistance furnace with a time relay and the resistance furnace, relates to the two-position type resistance, and aims to solve the over-temperature warning invalidation problem of an existing two-position type temperature-control resistance furnace. Under a no-load condition, the resistance furnace is powered up for a first time and load of the resistance furnace is continuously powered up until the furnace temperature reaches a warning temperature after the furnace temperature is controlled by an original temperature control system to reach a given temperature for a second time. A time length value needed for enabling the furnace temperature to reach the given temperature for a second time until the warning temperature is measured, and the time length value is taken as delay power-on time length of the time relay; a power supply input end of the relay is connected with a power supply line of a power supply input end of resistance furnace load; a power supply output end of the time relay is connected with an acousto-optic warning module; and when single-time power-on time length of the resistance furnace load reaches the time length value, the acousto-optic warning module is powered up to emit sound light. The method and the resistance furnace disclosed by the invention have the advantage of warning when over-temperature occurs. The method is suitable for thermal treatment of the two-position type resistance furnace.

Description

technical field [0001] The invention relates to a method for over-temperature alarming with a two-position resistance furnace provided with a time relay and the resistance furnace, which is applied to the field of two-position temperature-controlled resistance furnaces. Background technique [0002] The resistance furnace is an industrial furnace that uses electric current to heat the electric heating element or heating medium in the furnace, thereby heating the workpiece or material. Resistance furnaces are used in the machinery industry for heating before metal forging, metal heat treatment, brazing, powder metallurgy sintering, glass ceramics firing and annealing, melting of low melting point metals, drying of sand molds and paint films, etc. [0003] There are generally three ways to adjust (automatically control) the temperature of the resistance furnace: two-position automatic adjustment, continuous PID automatic adjustment and quasi-continuous automatic adjustment. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D19/00F27D21/04
CPCF27D19/00F27D21/04F27D2019/0003
Inventor 高枝森张健杨鑫王淑新周策曹利峰林延伟李应新陈军王勇
Owner HARBIN TURBINE