CN217418757U

CN217418757U - Mesh belt type surface carburizing heat treatment furnace

Info

Publication number: CN217418757U
Application number: CN202122954717.8U
Authority: CN
Inventors: 何爱明
Original assignee: CHANGSHU CITY NO2 STANDARD PARTS FACTORY
Current assignee: CHANGSHU CITY NO2 STANDARD PARTS FACTORY
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-09-13
Anticipated expiration: 2031-11-29

Abstract

The utility model discloses a mesh belt type surface carburizing heat treatment furnace, include: the furnace body is sequentially divided into a feeding section, an isolation section, a heat treatment section and a cooling section along the conveying direction of the mesh belt, and partition walls are arranged among the sections; set up gas curtain mechanism on the isolation section, the end position of thermal treatment section sets up the air inlet, the tail end of thermal treatment section sets up the exhanst gas outlet, the external draught fan of exhanst gas outlet, the external confluence pipeline of air inlet, carrier gas pipeline and rich gas pipeline are connected simultaneously to the confluence pipeline, install solenoid valve and flowmeter on carrier gas pipeline and the rich gas pipeline respectively, all solenoid valves and flowmeter all with controller electric connection, thermal treatment section top still installs the oxygen probe, the oxygen probe also with controller electric connection. In this way, the utility model discloses can the accurate control use the coal gas as the carbon potential of the interior atmosphere of stove of carrier gas, miscellaneous gas is few in the stove moreover, and product quality is homogeneous more stable.

Description

Mesh belt type surface carburizing heat treatment furnace

Technical Field

The utility model relates to the field of heat treatment equipment, in particular to a mesh belt type surface carburizing heat treatment furnace.

Background

Carburization is a common heat treatment process that functions to penetrate carbon atoms into the surface layer of the steel. The low-carbon steel workpiece is provided with a surface layer of high-carbon steel, and the surface layer of the workpiece is subjected to quenching and low-temperature tempering to have high hardness and wear resistance, while the central part of the workpiece still maintains the toughness and plasticity of the low-carbon steel. The traditional carburization treatment mode is to use N2 gas, cracking gas of methanol, equal endothermic conversion gas as carrier gas in a heat treatment furnace; acetone, propane gas, butane gas, toluene and the like are added as enrichment components. The carbon potential of the furnace atmosphere is controlled to a constant value, and in order to control the carbon potential value, a common method is to measure the partial pressure of CO (pCO) and the partial pressure of CO2 (pCO2) in the atmosphere by an infrared gas analyzer, calculate the pCO 2/pCO ratio in the heat treatment atmosphere based on the measured values, and control and adjust the supply amount of the concentrated component so that the values fall within a predetermined range. However, with the development of the times, the cost of the conventional carrier gas is high, and some sources are unstable, so that the adoption of coal gas as the carrier gas becomes the optimal choice for reality, but the use of coal gas as the carrier gas makes the original infrared gas analysis device unable to accurately measure the partial pressure of CO and the partial pressure of CO2 in the atmosphere, so that the carbon potential in the heat treatment atmosphere cannot be controlled, and the existing mesh-belt type heat treatment furnace is easy to bring in miscellaneous gas, further aggravating the uncontrollable internal atmosphere.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problem of providing a mesh belt type surface carburizing heat treatment furnace which can use coal gas as carrier gas and has uniform and stable carburizing quality.

In order to solve the technical problem, the utility model discloses a technical scheme be: provided is a mesh belt type surface carburizing heat treatment furnace including: the furnace body is sequentially divided into a feeding section, an isolation section, a heat treatment section and a cooling section along the conveying direction of the mesh belt, and partition walls are arranged among the sections; set up gas curtain mechanism on the isolation section, the end position of thermal treatment section sets up the air inlet, the tail end of thermal treatment section sets up the exhanst gas outlet, the external draught fan of exhanst gas outlet, the external confluence pipeline of air inlet, carrier gas pipeline and rich gas pipeline are connected simultaneously to the confluence pipeline, install solenoid valve and flowmeter on carrier gas pipeline and the rich gas pipeline respectively, all solenoid valves and flowmeter all with controller electric connection, thermal treatment section top still installs the oxygen probe, the oxygen probe also with controller electric connection.

In a preferred embodiment of the present invention, the induced draft fan is connected to the air curtain mechanism through a pipe.

In a preferred embodiment of the present invention, the front section of the isolation section is further provided with a negative pressure chamber, the negative pressure chamber is provided with a first gas outlet, the first gas outlet is externally connected with a negative pressure pipeline, and the negative pressure pipeline is externally connected with a suction device. The tail of the cooling section is provided with a second air outlet which is externally connected with a negative pressure pipeline.

In a preferred embodiment of the present invention, the feeding section is a closed section, the end of the mesh belt is disposed in the feeding section, and the feeding port is disposed directly above the mesh belt.

In a preferred embodiment of the present invention, the air inlet is provided below the mesh belt.

In a preferred embodiment of the present invention, the tail end of the mesh belt extends out of the cooling section, and a quenching tank is connected below the tail end of the mesh belt.

In a preferred embodiment of the present invention, the number of the air curtain mechanisms is two, and the air curtain mechanisms are respectively installed above and below the mesh belt.

The utility model has the advantages that: the utility model discloses an oxygen probe replaces traditional outer gas analysis device to install in guipure thermal treatment stove, realizes that coal gas is as the carburization technology of carrier gas, and the furnace body is compared with the tradition moreover, and preceding sealing performance is better, and miscellaneous gas is difficult to get into in the furnace body, and the stability of the carbon potential atmosphere of the interior thermal treatment section of stove is higher, and is more even stable to the carburization on product surface, of high quality.

Drawings

FIG. 1 is a schematic view of the overall structure of a preferred embodiment of the present invention;

the parts in the drawings are numbered as follows:

1. the device comprises a furnace body, 2, a mesh belt, 3, a controller, 4, a quenching tank, 5, a carrier gas pipeline and 6, an enriched gas pipeline;

101. the device comprises an air inlet, 102, a smoke outlet, 103, an air curtain mechanism, 104, a first air outlet, 105, a second air outlet, 106 and an induced draft fan;

301. the flow meter comprises a first electromagnetic valve, 302, a first flow meter, 303, a second electromagnetic valve, 304, a second flow meter, 305 and an oxygen probe.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 1, an embodiment of the present invention includes:

a mesh belt type surface carburizing heat treatment furnace comprising: the furnace body 1 is sequentially divided into a feeding section, an isolation section, a heat treatment section and a cooling section along the conveying direction of the mesh belt 2, partition walls are arranged among the sections, the tail end of the mesh belt 2 extends out of the cooling section, and a quenching tank 4 is connected below the tail end of the mesh belt 2; set up gas curtain mechanism 103 on the isolation section, gas curtain mechanism 103 is total two and installs respectively in the top and the below of guipure 2, the end position of thermal treatment section sets up air inlet 101, the tail end of thermal treatment section sets up exhanst gas outlet 102, the external draught fan 106 of exhanst gas outlet 102, the external converging pipe of air inlet 101, converging pipe connects simultaneously carrier gas pipeline 5 and enrichment trachea way 6, install first solenoid valve 301 and first flowmeter 302 on carrier gas pipeline 5, install second solenoid valve 303 and second flowmeter 304 on the enrichment trachea pipeline 6, all solenoid valves and flowmeter all with 3 electric connection of controller, thermal treatment section top still installs oxygen probe 305, oxygen probe 305 also with 3 electric connection of controller.

The induced draft fan 106 is connected with the air curtain mechanism 103 through a pipeline, air flow separation of the feeding section is achieved through combusted gas in the mode, and influence of outside air on the heat treatment section is reduced.

The anterior segment of isolation section still is provided with the negative pressure chamber, set up first gas outlet 104 on the negative pressure chamber, first gas outlet 104 external negative pressure pipeline, the external getter device of negative pressure pipeline. The cavity provided with the negative pressure has the function of sucking away the overflow part of the flue gas sprayed to the mesh belt 2 through the air curtain mechanism 103, so that the flue gas is prevented from overflowing from the discharge port to pollute the field environment, meanwhile, the air brought in from the feed port can be sucked away, and the overall effect of the isolation section is further improved.

The cooling section afterbody sets up second gas outlet 105, the external negative pressure pipeline of second gas outlet 105, the purpose that second gas outlet 105 set up reduces the flue gas and spills over from the discharge end, gets into the surrounding environment, and second gas outlet 105 and first gas outlet 104 can share negative pressure pipeline moreover, reduce overall cost.

The feeding section is of a semi-closed structure, the end of the mesh belt 2 is arranged in the feeding section, and the feeding hole is arranged right above the mesh belt 2. The semi-closed structure is adopted to further reduce air brought in during feeding, reduce the influence on the atmosphere in the furnace, and the feeding port is arranged right above the mesh belt 2, so that vertical feeding is facilitated.

The air inlet 101 is arranged below the mesh belt 2, and the reason for arranging below the mesh belt 2 is that the whole temperature is more balanced when the combustion is started to form a fire chain in the hearth.

The working principle of the utility model is as follows:

when the furnace body works, firstly, the oxygen probe 305 transmits an oxygen potential signal to the controller 3, then the controller 3 converts carbon potential data according to the oxygen potential data for comparison, then adjusts the ratio of carrier gas flow to enriched gas flow according to a function relationship stored in advance according to a comparison result, the adjustment mode is that firstly, the opening degree of a first electromagnetic valve 301 of a carrier gas pipeline 5 is adjusted according to a first flow meter 302, then the opening degree of a second electromagnetic valve 303 is adjusted according to a second flow meter 304, after the adjustment is finished, the controller 3 compares the feedback data of the oxygen probe 5 again, and the process is repeated according to the feedback data, so that the carbon potential atmosphere formed in the heat treatment furnace after the carrier gas and the enriched gas are mixed meets the requirement.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A mesh belt type surface carburizing heat treatment furnace is characterized by comprising: the furnace body is sequentially divided into a feeding section, an isolation section, a heat treatment section and a cooling section along the conveying direction of the mesh belt, and partition walls are arranged among the sections; set up gas curtain mechanism on the isolation section, the end position of thermal treatment section sets up the air inlet, the tail end of thermal treatment section sets up the exhanst gas outlet, the external draught fan of exhanst gas outlet, the external confluence pipeline of air inlet, carrier gas pipeline and enriched gas pipeline are connected simultaneously to the confluence pipe, install solenoid valve and flowmeter on carrier gas pipeline and the enriched gas pipeline respectively, all solenoid valves and flowmeter all with controller electric connection, the oxygen probe is still installed to thermal treatment section top, the oxygen probe also with controller electric connection.

2. The mesh belt type surface carburizing heat treatment furnace according to claim 1, wherein the induced draft fan is connected with the air curtain mechanism through a pipeline.

3. The mesh-belt type surface carburizing heat treatment furnace according to claim 1, wherein the front section of the isolation section is further provided with a negative pressure cavity, the negative pressure cavity is provided with a first air outlet, the first air outlet is externally connected with a negative pressure pipeline, and the negative pressure pipeline is externally connected with an air suction device.

4. The mesh-belt type surface carburizing heat treatment furnace according to claim 3, wherein a second air outlet is arranged at the tail of the cooling section, and the second air outlet is externally connected with a negative pressure pipeline.

5. The mesh belt type surface carburizing heat treatment furnace according to claim 1, wherein the feeding section is a closed section, the end of the mesh belt is arranged in the feeding section, and the feeding port is arranged right above the mesh belt.

6. The mesh belt type surface carburizing heat treatment furnace according to claim 1, wherein the gas inlet is provided below the mesh belt.

7. The mesh belt type surface carburizing heat treatment furnace according to claim 1, wherein the tail end of the mesh belt extends out of the cooling section, and a quenching tank is connected below the tail end of the mesh belt.

8. The mesh belt type surface carburizing heat treatment furnace according to claim 1, wherein there are two air curtain mechanisms respectively installed above and below the mesh belt.