CN2047769U

CN2047769U - Walking beam electric furnace for heating short plate spring

Info

Publication number: CN2047769U
Application number: CN 89203156
Authority: CN
Inventors: 曹希斌; 麦克元; 段维华
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-03-17
Filing date: 1989-03-17
Publication date: 1989-11-15

Abstract

The utility model discloses a walking beam electric furnace for heating short plate spring belonging to a plate spring electric furnace for hardening heat. The feeding mechanism of the utility model breaks through the existing feeding mechanism of double beam in the trace of rectangular walking, and adopts single beam. Firebricks used for the removable bottom are built on the single beam, which can save a large number of expensive advanced heat resisting steel and simplify the mechanism. The utility model has the advantages of long service life, convenient maintenance, small size, high thermal efficiency and long service life. In addition, the dimension of the hearth is also optimized. The furnace temperature automatic regulating device with infrared detection which is interlocked with the feeding mechanism is collocated in the furnace, which makes the temperature control more precise, the hardening rhythmize and the hardening hardness obtain optimization.

Description

Walking beam electric furnace for heating short plate spring

The utility model relates to a kind of electric furnace of quenching heating unit, particularly a kind of special use of leaf spring.

At present, the leaf spring that relevant producer uses adds electrothermal stove and is all the heating lengthy motion picture, and it was both uneconomical to heat short-movie with it, its thermo-efficiency too low again (less than 40%); The feed mechanism that this existing leaf spring adds electrothermal stove is a twin beams square mark step feeder, its complex structure, though adopt expensive high-grade heat-resistant steel as longeron, its thermal fatigue life is still shorter, and maintenance capacity is bigger, and cost is higher; In addition, this workpiece temperature control instability that adds electrothermal stove can not be interlocked with executive system.

The purpose of this utility model provides a kind of stepped start-stop system electric furnace that heats the short-movie leaf spring, and its thermo-efficiency height is simple in structure, flexible, maintenance capacity is little, and whole stove cost is low, the workpiece temperature control stabilization, and can interlock with executive system.

The electric furnace of realizing above-mentioned purpose has several parts of body of heater, heating unit, feed mechanism and temp detecting controller, its notable attribute is, (a) feed mechanism comprises longeron, make longeron oil cylinder that moves up and down and the oil cylinder that the longeron work is seesawed, the longeron of carrying and support leaf spring adopts ordinary steel and refractory brick blended single-spar construction, forms at the bottom of the travelling oven; (b) optimization of burner hearth is of a size of, long L=2300～2500mm, and, wide W=850～950mm, high H=70～90mm; (c) temp detecting controller of electric furnace is ratio, integration, differential (PID) furnace temperature self-reacting device, and this device is connected and composed by silicon-controlled voltage regulation device and PID setter, and its temperature sense spare is the infrared rays temperature-sensing element.

According to one of embodiment of the present utility model shown in the drawings, the structure that originally adds electrothermal stove is described in further detail below.

Fig. 1 is an overall construction drawing of the present utility model;

Fig. 2 is a cross sectional representation of the present utility model;

Fig. 3 is the feed mechanism synoptic diagram;

Fig. 4 is the synoptic diagram of furnace temperature self-reacting device.

Sequence number among each figure is represented: charging deck 1, charging fire door 2, body of heater 3, infrared rays temperature-sensing element 4, heating unit 5, furnace roof 6, automatic material separator mouth 7, feed mechanism 8, longeron seesaw oil cylinder 9, longeron move up and down oil cylinder 10, pull bar 11, lever 12, longeron 13, refractory brick 14, leaf spring 15, infrared electro modulator 16, PID setter 17, silicon-controlled voltage regulation device 18, support 19.Referring to each figure, whole leaf spring heating stepping electric furnace comprises body of heater 3, heating unit 5, feed mechanism 8 and several parts of temp detecting controller.Feed mechanism 8 comprises two longerons 13, longerons the seesaw oil cylinder 9 and the oil cylinder 10 that moves up and down, and longeron 13 is the mixed structure of common shaped steel and refractory brick 14, at the bottom of travelling oven.The part that longeron extends body of heater constitutes charging deck 1, seesaw oil cylinder 9 and the oil cylinder 10 that moves up and down of longeron is loaded on charging deck 1 time, oil cylinder 9 is connected with charging deck, oil cylinder 10 is connected with pull bar 11, pull bar 11 is connecting an end of lever 12, and the other end of lever 12 is by roller wheel bearing contact longeron bottom.During feeding, oil cylinder 10 moves after making pull bar 11, lever 12 rises longeron 13 and top leaf spring 15 thereof, oil cylinder 9 begins to start, and longeron 13 is pushed away before the roller on the lever 12, and the back oil cylinder 10 that puts in place makes pull bar 11 reaches, on longeron 13 and leaf spring 15 declines are supported at the bottom of the stationary furnace, oil cylinder 9 starts once more, move after making longeron 13, thereby longeron 13 is finished first moment mark step feeding.Originally the size of burner hearth that adds electrothermal stove has been done optimization,, respectively is of a size of long L=2300～2500mm, wide W=850～950mm, high H=70～90mm to obtain higher thermo-efficiency.Electric furnace disposes ratio, integration, differential (PID) furnace temperature self-reacting device, and this device is formed by connecting by silicon-controlled voltage regulation device 18 and PID setter 17, and its infrared rays temperature-sensing element 4 is loaded among the burner hearth.The signal input part of silicon-controlled voltage regulation device 18 is connected with the signal output part of PID setter 17, and its output terminal and controllable silicon SCR ₁And SCR ₂Connect, the letter of PID setter 17 is connected with infrared rays temperature-sensing element 4 through infrared electro modulator 16 with input terminus.Behind electric furnace when work infrared rays temperature-sensing element 4 temperature-sensitives, through 16 modulation of infrared electro modulator, signal after amplifying is carried out the display instrument that PID setter 17 is delivered in rectification, and by the signal of ratio, integration, differential (PID) setter output 0～10mA to the silicon-controlled voltage regulation device, produce relative trigger pulse phase shift, the levelling controllable silicon SCR ₁And SCR ₂The conducting degree, make the voltage of heating unit 5 in the input electric furnace almost make the deviation that corresponding of change And overcomes furnace temperature makes it be returned to original set-point exactly noninertia, control the action of the

oil cylinder

9,10 of feed mechanism simultaneously, when leaf spring arrives quenching temperature, described furnace temperature self-reacting device makes the feed mechanism action, leaf spring is taken off in automatic material separator mouth 7, remake quench treatment, if leaf spring do not reach temperature, the described furnace temperature self-reacting device feed mechanism that just is automatically locked stops feeding.Originally the bottom of furnace body that adds electrothermal stove is Steel Bracket 19 aerial constructions, adopts wall screw and ground to fix, so that its weight reduction, and can make any dislocation with the technology adjustment.

Above-mentioned the technical solution of the utility model has following effect: the feed mechanism of (1) electric furnace adopts the single-beam of ordinary steel and refractory brick mixed structure, but simplified construction reduces weight, saves starting material.Longeron is positioned at outside the burner hearth, is not subjected to the high temperature action in the burner hearth, therefore can adopt ordinary steel, thereby reduces cost (whole stove cost can descend 20%) significantly, improves work-ing life, and maintenance load is descended; (2) the furnace cavity size after optimizing reduces significantly than existing similar electric furnace, so the temperature difference in the stove also reduces to some extent, and thermo-efficiency can bring up to 41～45%; (3) stove has disposed PID furnace temperature self-reacting device, and it and feeding mechanical interlocking, and the control accuracy of furnace temperature can improve greatly, the rhythmization but leaf spring quenches, thus quenching hardness is optimized, further improve fatigue lifetime; (4) structure of the built on stilts supporting of Steel Bracket is adopted in the bottom of body of heater, and whole stove can lift dislocation arbitrarily with the technology adjustment, so have higher flexibility.

Claims

1, a kind of short-movie leaf spring heating stepping electric furnace comprises body of heater, heating unit, feed mechanism and temp detecting controller, it is characterized in that:

(a) feed mechanism by longeron, make longeron make the oil cylinder seesaw and the oil cylinder that longeron is moved up and down constitutes, carry the longeron of supporting leaf spring also to adopt the mixed structure of ordinary steel and brick firebrick, at the bottom of the formation travelling oven,

(b) optimization of burner hearth is of a size of, long L=2300～2500mm, and wide W=850～950mm, high H=70～90mm,

(c) temp detecting controller is ratio, integration, differential (PID) furnace temperature self-reacting device, and it is formed by silicon-controlled voltage regulation device and the connection of PID setter, and its temperature sense spare adopts infrared rays temperature-sensing element.

2, by the described electric furnace of claim 1, the longeron that it is characterized in that feed mechanism extends body of heater and partly constitutes charging deck 1, seesaw oil cylinder 9 and the oil cylinder 10 that moves up and down of longeron is loaded on charging deck 1 time, oil cylinder 9 is connected with charging deck, oil cylinder 10 is connected with pull bar 11, pull bar 11 connects an end of lever 12, and the other end of lever 12 is by the bottom of roller wheel bearing longeron 13.

3, by the described electric furnace of claim 1, it is characterized in that bottom of furnace body adopts Steel Bracket 19 built on stilts supportings, support is fixed with wall screw and ground.

4, by claim 1,2 or 3 described electric furnaces, it is characterized in that the signal input part of the silicon-controlled voltage regulation device 18 of PID furnace temperature self-reacting device is connected with the signal output part of PID setter 17, and its output terminal and controllable silicon SCR ₁And SCR ₂Connect, infrared rays temperature-sensing element 4 is connected through the signal input part of infrared electro modulator with PID setter 17.