CN86201813U - Vacuum nitriding heat-treatment furance - Google Patents
Vacuum nitriding heat-treatment furance Download PDFInfo
- Publication number
- CN86201813U CN86201813U CN 86201813 CN86201813U CN86201813U CN 86201813 U CN86201813 U CN 86201813U CN 86201813 CN86201813 CN 86201813 CN 86201813 U CN86201813 U CN 86201813U CN 86201813 U CN86201813 U CN 86201813U
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- vacuum
- automatic control
- equipment
- intermediate relay
- control device
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Abstract
The utility model discloses a vacuum nitriding heat-treatment device. A gas distributing pipe is increased on an external heat type and horizontal type vacuum nitriding heat-treatment furnace. Heating elements are arranged reasonably. An effective thermal insulation structure is adopted. The utility model is provided with automatic control devices of temperature, pressure, flow rate, time and alarm. The utility model is applied to vacuum nitriding, vacuum tempering, other chemical heat-treatment below 650 DEG and normal heat-treatment.
Description
The utility model is the thermo-chemical treatment equipment of metal.
Existing external-heat vacuum heat treatment furnace has simple in structure, easy to manufacture, and operating maintenance is convenient, and annex is few in jar, no vacuum discharge phenomenon, and facility investment is few.But this type of furnace thermal inertia is big, and thermo-efficiency is low, mainly as vacuum annealing thermal treatment, can not carry out vacuum nitriding and other thermo-chemical treatment, so use range is narrow.
The utility model improves external-heat horizontal vacuum heat treatment furnace, allows to be used for vacuum nitriding thermal treatment and other vacuum chemistry thermal treatment, reduces thermal inertia, improves the level of automation of thermo-efficiency and raising heat treatment process.
Fig. 1 is a longitudinal section of the present utility model synoptic diagram.
Among the figure: 1-furnace shell 2-vacuum container cover 3-heat screen 4-insulation material 5-carborundum horse fluorine 6-vacuum tank 7-gas distributing pipe 8-thermocouple 9-heating 10-is from dynamic control device 11-magnet-type vacuum valve 12-flowmeter 13-ammonia source 14-exhaust tube 15-pressure-measuring pipe interface 16-vent valve 17-vacuum system
Fig. 2 is cross-sectional diagrammatic sketch.
Among the figure: 5-silicon nitride horse fluorine
Fig. 3 is the schematic circuit diagram of automatic control device (10 among Fig. 1).
Among the figure: SCR-silicon controlled rectifier D-commutation diode wy-Zener diode
BG-triode transistor R-resistance W-potentiometer C-electric capacity
RLS-fusible cut-out A-alternating current ammeter V-A.C. voltmeter XD-signal lamp
QA-press button TA-press button J-intermediate relay
SJ-time relay K-switch LH-current transformer DCT-electro-magnet ZX-150-electric contact vacuum meter XCT-111-temperature indication adjusting apparatus
The IC-surface-mounted integrated circuit
-suction motor
Vacuum tank (6) is cylindrical shape, and is horizontal, and vacuum container cover (2) has been located heat screen (3), and vacuum tank (6) bottom has a gas service pipes (7) to pass into, and the aperture of the about φ 2mm of two rows is arranged on the gas service pipes (7). The about 8mm of pitch-row, the air-flow emission direction of two apertures becomes 90 ° up, and is all at 45 ° with vertical line, and required ammonia can evenly be distributed in tank, makes nitriding workpiece infiltration layer even. The other end of gas service pipes (7) communicates with ammonia source (13), pipeline outside vacuum tank is measured ammonia flow with flowmeter (12), control the ammonia that enters vacuum tank with magnet-type vacuum valve (11), vacuum tank (6) bottom has a hole to be connected with exhaust tube (14) in addition; There is the inner electric contact vacuum meter (ZX-150) of a pressure measurement interface (15) and automaton (10) to communicate on the pump-line, vacuum in the vacuum tank is shown and control by electric contact vacuum meter (ZX-150), waste gas is extracted out by vavuum pump through exhaust tube (14), thermocouple (8) inserts and measures temperature in the tank in the vacuum tank (6), temperature is regulated by the automaton (10) that is electrically connected with thermocouple (8), for improving the thermal efficiency, insulation material (4) adopts aluminosilicate refractory fiber, because vacuum tank two ends heat loss is big, for making temperature even, the heating (9) that is placed in the silicon carbide refractory products horse fluorine (5) distributes close at the two ends of tank, middle rare, make like this two ends heating power big, middle power is little, and makes temperature even. When adopting the helical form heating, more greatly, the mid portion pitch is littler in the two ends of tank screw pitch. Carborundum horse fluorine (5) is made and is partly covered shape, heat transfer efficiency is improved, when heating up, adopts by stove the 220V ac power supply, after uniform temperature, regulated by the SCR AC voltage-regulating system that automaton (10) is inner, reduce input power, constant current, programming rate is slowed down, to improve temperature-controlled precision, can reduce like this body of heater thermal inertia and hold, radiation loss, furnace shell (1) adopts double-deck furnace shell at the burner hearth effective heating area, it is excessive to reduce heat, increases the stove heat insulation effect, and automaton (10) is to temperature in the vacuum tank, pressure, ammonia flow and heat treatment time and technical process adopt automatically control. Control procedure is as follows:
1. temperature control: thermopair (8) flows to XCT-111 three-position type indication adjusting apparatus by compensating lead wire with thermoelectric force, during intensification, presses QA
1Button, intermediate relay J
1Adhesive, J
1-4Closure, J
1Self-locking, the SCR conducting, electric current is fully loaded, electrical heating element (9) input rated output.This moment J
1-3Adhesive, pilot lamp XD
1(blue look) is bright, and furnace temperature rises.When furnace temperature arrives to fixed temperature, intermediate relay J
2Adhesive, J
2-1Disconnect J
1Disconnect J
1-1Adhesive, silicon controlled rectifier is by unijunction transistor BG
1Silicon triode BG
2Trigger control.This moment J
1-3Disconnect pilot lamp XD
1(blue look) goes out.When if furnace temperature is higher than under the instrument XCT-111 reference mark, intermediate relay J
2Disconnect J
2-2Disconnect metal film resistor R
9Bring pilot circuit into, changing the controllable silicon SCR ignition current; When furnace temperature continue to rise, when surpassing on the instrument reference mark, intermediate relay J
3Adhesive, J
3-1Disconnect, controllable silicon SCR loses ignition current, electric furnace outage, J at this moment
3-2Adhesive, pilot lamp XD
2(redness) is bright, J
3-3Adhesive, music news acoustic system music alarm.
2. pressure-controlling: the control that comes down to vacuum tightness in the stove.When beginning to vacuumize, press the button switch QA
2, intermediate relay J
6Adhesive, vacuum pump starts.When vacuum tightness in the vacuum tank is higher than electric contact vacuum meter ZX-150 lower limit controlling valu, intermediate relay J
5Adhesive, J
5-1, J
6, J
6-2, J
6-3, J
6-4Disconnect, vacuum system (17) stops to bleed, when vacuum tank vacuum tightness is lower than ZX-150 upper limit controlling valu, and intermediate relay J
6Adhesive, vacuum system (17) begin again to start vacuum pump (
) bleed.
3. flow control: after gaseous state or the liquid raw material gas decompression gasification, the gas that participates in reaction enters in the vacuum tank (6).Air demand determines the length of magnet-type vacuum valve (DCT) opening and closing time by vacuum tightness requirement in the stove.During air feed, intermediate relay J
5, J
5-2, J
4, J
4-1Adhesive, magnet-type vacuum valve (DCT) adhesive work, ammonia enters in the vacuum tank (6).When stopping air feed, intermediate relay J
4Adhesive, J
5, J
4-1Disconnect, magnet-type vacuum valve DCT disconnects, and air-flow is blocked.This moment J
4-2Adhesive, pilot lamp XD
3(Huang) is bright, because J
4-3Adhesive, music news acoustic system () music alarm.
4. the delay time before the vacuum pump startup in the vacuum system is being controlled in time control, the time relay (SJ), and its working process is: when middle relay J
6Disconnect J
6-5Adhesive, the time relay (SJ) work is through time-delay, SJ
1Adhesive, J
6Adhesive, the suction motor of vacuum system (17) (
) start and to vacuumize.
The main technical details of a specific embodiment of the present utility model is:
The about 1KW of rated output 6KW insulation power
Single phase alternating current 50HZ
650 ℃ of temperature-controlled precision ± 5 of maximum operation (service) temperature ℃
About 60 ℃ of empty stove heating-up time
Vacuum tank effective dimensions φ 200 * 250mm
About 10 kilograms of batch
Its series product, watt level are determined on demand.
The utility model vacuum nitriding technological process is as follows: after will needing the heat treated workpiece cleaning of vacuum nitriding to deoil, at nitriding temperature as 570 ℃ of following hot charging stoves, but also cold charge stove, the 220V full power heats up during blow-on, behind nitriding temperature, the silicon controlled rectifier automatic Regulation reduces power, range of regulation is 60V-220V, to reduce heat-up rate.If surpass nitriding temperature, temperature-adjusting circuit can cut off the power supply and report to the police automatically.Temperature controlling system makes the interior temperature-controlled precision of vacuum tank (6) at ± 5 ℃ like this, has avoided the too high phenomenon of temperature, and thermal inertia also therefore reduces.When vacuumizing, press vacuum pump starting switch QA
2, begin to vacuumize, when when being evacuated to the 1-10 torr, reaching the lower limit controlling valu of electric contact vacuum meter (ZX-150), indirect tentaculum J
5, J
5-2Adhesive makes magnet-type vacuum valve DCT adhesive, and ammonia is in gas service pipes (7) enters vacuum tank (6).After ammonia was heated, the part ammonia decomposed, and (N) active atomic part that decomposites is absorbed by the steel surface, and a part is combined into molecule nitrogen N rapidly
2, N
2And H
2And undecomposed NH
3Become waste gas and regularly extracted out emptying or entry automatically by vacuum system (17).When the numerical value that vacuum meter shows when the gaseous tension that charges in the vacuum tank is higher than electric contact vacuum meter upper limit controlling valu is the 300-350 torr, intermediate relay J
4Adhesive, J
4-1Disconnect, the magnet-type vacuum valve disconnects because of DCT discharges, and blocks air-flow.Simultaneously, intermediate relay J
6Disconnect J
6-2Adhesive, after the time relay (SJ) time-delay for some time, SJ
1Adhesive, J
6Adhesive, vacuum pump (
) start and to vacuumize.Begin to vacuumizing end from charging into ammonia, about 5 minutes of each pulse process, wherein supplied ammonia 0.5 minute, keep-uped pressure 4-3.5 minute, bled 0.5-1 minute, this process circulates repeatedly, finishes this working cycle jointly by pressure control circuit, flow control circuit, time control circuit.Nitridation process also can adopt fine setting air feed, air suction mode to supply continuously in vacuum tank (6), bleed in addition.The workpiece vacuum nitriding time decides on technical requirements, generally at 2-4 hour, after nitridation process is finished, cuts off the electricity supply, and turns on small-sized purging valve (15), puts into air, makes furnace pressure be backfilled to 760mmHg, opens fire door then, takes out work-piece cools.
The utility model is applicable to various steel tool, mould and small lot metallic article, particularly there is the surface of the work of aperture, blind hole to require part wear-resistant, bite-resistant to carry out vacuum nitriding, vacuum tempering, and other thermo-chemical treatment below 650 ℃ and conventional heat treatment usefulness. The utility model is because compact conformation is easy to obtain the required vacuum of heat treatment, and unstripped gas consumption is few, nitrogenize heat treatment reaction speed is fast, lay particular stress on mini-series, highly effective, cost is low, little power consumption, thermal efficiency height, noise is few, and working environment is good, floor space is little, and especially suitable medium-sized and small enterprises, R﹠D institution, school use equipment as production, scientific research, education experiment three.
Claims (8)
1, a kind of metallic substance heat treatment furnace, comprise vacuum tank (6), furnace shell (1), thermopair (8), heating unit (9), thermoscreen (3), extraction pipe (14), it is characterized in that the gas service pipes (7) that communicates with ammonia source (13) is arranged at vacuum tank (6) bottom, the silicon carbide horse fluorine (5) that is placed with electrical heating element (9) of vacuum tank (6) outside is for partly covering shape, the two ends that are distributed as jar of electrical heating element (9) are close, middle rare, furnace shell (1) is a bilayer structure at effective heating region, have and thermopair (8), electro-magnet vacuum valve (11) is electrically connected, the temperature that is connected with valve tube interface (15), pressure, ammonia flow, the automatic control device of music alarm (10) when time and over-temp and over-pressure.
2,, it is characterized in that having on the gas service pipes (7) two row's apertures according to the equipment of claim 1 defined.
3, according to the equipment of claim 2 defined, the air-flow ejection that it is characterized in that the row of two on the gas service pipes (7) aperture is to becoming 90 °.
4,, it is characterized in that having the SCR AC regulating circuit of controlling furnace temperature in the control dress (10) automatically according to the equipment of claim 1 defined.
5,, it is characterized in that automatic control device (10) lining has electric contact vacuum meter (ZX-150), intermediate relay (J according to the equipment of claim 1 defined
5, J
6) the vacuum tightness automatic control circuit formed.
6,, it is characterized in that having magnet-type vacuum valve (DCT), intermediate relay (J in the automatic control device (10) according to the equipment of claim 1 defined
4, J
5) the ammonia flow automatic control circuit formed.
7,, it is characterized in that automatic control device (10) has the time relay (SJ), intermediate relay (J according to the equipment of claim 1 defined
6) regularly bleed the time control circuit of air feed in the vacuum tank (6) formed.
8,, it is characterized in that automatic control device (10) has the intermediate relay (J that is electrically connected with electric contact vacuum meter (ZX-150) according to the equipment of claim 1 defined
4, J
5), the intermediate relay (J that is electrically connected with furnace temperature indication adjusting apparatus (XCT-111)
1, J
2, J
3), the music alarm circuit during over-temp and over-pressure that music news acoustic system is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86201813 CN86201813U (en) | 1986-03-27 | 1986-03-27 | Vacuum nitriding heat-treatment furance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86201813 CN86201813U (en) | 1986-03-27 | 1986-03-27 | Vacuum nitriding heat-treatment furance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86201813U true CN86201813U (en) | 1986-12-03 |
Family
ID=4805485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86201813 Ceased CN86201813U (en) | 1986-03-27 | 1986-03-27 | Vacuum nitriding heat-treatment furance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86201813U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401430C (en) * | 2000-07-14 | 2008-07-09 | 住友电气工业股份有限公司 | Pressure heat treatment apparatus employed for preparing oxide superconducting wire |
| CN102781562A (en) * | 2009-12-24 | 2012-11-14 | Lg伊诺特有限公司 | Heat treatment container for vacuum heat treatment apparatus |
| CN102159910B (en) * | 2008-09-17 | 2013-07-17 | 爱沃特株式会社 | Heat treatment furnace, heat treatment method, and method of using heat-treatment furnace |
| CN106371480A (en) * | 2015-07-24 | 2017-02-01 | 中船重工海博威（江苏）科技发展有限公司 | Electric heating temperature control system and method for ammonia-containing waste gas treatment through catalytic oxidation |
| CN110923676A (en) * | 2019-11-19 | 2020-03-27 | 有研国晶辉新材料有限公司 | Annealing equipment and process for multispectral zinc sulfide window |
-
1986
- 1986-03-27 CN CN 86201813 patent/CN86201813U/en not_active Ceased
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401430C (en) * | 2000-07-14 | 2008-07-09 | 住友电气工业股份有限公司 | Pressure heat treatment apparatus employed for preparing oxide superconducting wire |
| CN102159910B (en) * | 2008-09-17 | 2013-07-17 | 爱沃特株式会社 | Heat treatment furnace, heat treatment method, and method of using heat-treatment furnace |
| CN102781562A (en) * | 2009-12-24 | 2012-11-14 | Lg伊诺特有限公司 | Heat treatment container for vacuum heat treatment apparatus |
| CN102781562B (en) * | 2009-12-24 | 2014-11-19 | Lg伊诺特有限公司 | Heat treatment container for vacuum heat treatment apparatus |
| US9709334B2 (en) | 2009-12-24 | 2017-07-18 | Lg Innotek Co., Ltd. | Heat treatment container for vacuum heat treatment apparatus |
| CN106371480A (en) * | 2015-07-24 | 2017-02-01 | 中船重工海博威（江苏）科技发展有限公司 | Electric heating temperature control system and method for ammonia-containing waste gas treatment through catalytic oxidation |
| CN106371480B (en) * | 2015-07-24 | 2018-09-04 | 中船重工海博威（江苏）科技发展有限公司 | A kind of catalytic oxidation treatment ammonia-contaminated gas electricity consumption heating and temperature control system and method |
| CN110923676A (en) * | 2019-11-19 | 2020-03-27 | 有研国晶辉新材料有限公司 | Annealing equipment and process for multispectral zinc sulfide window |
| CN110923676B (en) * | 2019-11-19 | 2021-12-24 | 有研国晶辉新材料有限公司 | Annealing equipment and process for multispectral zinc sulfide window |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |