Rotary air-cooled box type atmosphere furnace

Abstract

A plurality of gas nozzles are arranged on the inner side of the rear wall of a chamber of a box-type furnace to form an array, flow valves matched with the gas nozzles in number are arranged on the outer side of the rear wall of the chamber and connected with the gas nozzles through gas pipes, a sample bracket is arranged in the chamber of the box-type furnace, and heaters are arranged on the two side walls of the chamber of the box-type furnace respectively. An exhaust one-way valve is arranged at an exhaust port in the top of the box-type furnace chamber and communicated with the external environment. The heat treatment box-type furnace for the experiment changes the current situation that the conventional heat treatment box-type furnace for the experiment cannot realize a gentle slope cooling rate, and has the advantages that the cooling ventilation rate is adjustable, each surface of a sample in the inner cavity of the box is cooled uniformly in the ventilation cooling process, and the characteristics of a test piece material are uniform.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment experimental devices, specifically a rotary air-cooled box-type atmosphere furnace. Background Technology

[0002] Box furnaces are general-purpose experimental heating devices applicable to various fields such as materials science, power generation, coal mining, papermaking, petrochemicals, cement, agriculture, animal husbandry, and pharmaceutical research. In the heat treatment of metal samples, situations often arise where the samples are heated to a high temperature and then slowly cooled or subjected to a gradient of slow cooling. Ordinary box furnaces typically only offer a limited number of heat treatment modes: heating with the furnace door open and air cooling; heating with slow cooling within the furnace; and heating with the furnace door open and immersion in liquid for quenching. Liquid quenching with the furnace door open offers the fastest cooling rate, air cooling with the furnace door open is relatively fast, and slow cooling within the furnace offers the slowest cooling rate. Achieving gradient cooling or a specific slow cooling rate is quite difficult. Summary of the Invention

[0003] This invention provides a rotary air-cooled box-type atmosphere furnace, which changes the current situation where existing experimental heat treatment box furnaces cannot achieve a specific and gradual cooling rate. It has the advantages of adjustable cooling and ventilation rate, and uniform cooling of all surfaces of the sample in the chamber during the ventilation and cooling process, resulting in uniform material properties of the sample.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A rotary air-cooled box-type atmosphere furnace is provided. Several gas nozzles are arranged in an array on the inner side of the rear wall of the furnace cavity. A number of flow valves of a matching number are arranged on the outer side of the rear wall of the furnace cavity and connected to the gas nozzles through gas pipes. A sample holder is arranged inside the furnace cavity. Heaters are arranged on both sides of the furnace cavity. An exhaust one-way valve is arranged at the exhaust port at the top of the furnace cavity to connect with the external environment.

[0006] The air volume ejected by each nozzle can be controlled by a corresponding flow valve to adapt to the needs of different sample shapes and sizes. This avoids unidirectional cold air cooling of localized areas of the workpiece, which could cause differences in local mechanical properties. The array of nozzles provides more even cold air blowing. The flow valve control function can adjust the air volume according to the temperature requirements inside the furnace. Thermocouples are installed inside the furnace for real-time temperature measurement. When a constant rate cooling curve is required for the metal sample or workpiece, the PLC controls the flow rate of the nozzles based on the thermocouple temperature settings, thus achieving a smooth cooling curve.

[0007] The heater is a silicon molybdenum rod, and a silicon carbide plate is installed to protect the heating element from corrosion or damage by materials.

[0008] The inlet port of the flow valve is connected to the outlet port of the solenoid valve through a pipe. The inlet port of the solenoid valve is connected to the outlet port of the dryer filter. The inlet port of the dryer filter is connected to a high-pressure air pump or a workshop compressed air pipeline.

[0009] The air pressure of the air nozzle is achieved by a high-pressure air pump. The cold air is cleaned and filtered by a dryer filter, and its opening and closing are controlled by a solenoid valve. Finally, it is delivered to the flow valve.

[0010] The lower part of the furnace cavity of the box furnace is provided with a rotating base, the sample holder is fixed on the rotating base, and the lower end face of the rotating base is connected to the output shaft of the gearbox through a connecting shaft and a coupling. The input end of the gearbox is connected to the rotating shaft of the motor.

[0011] The rotating base is driven by a motor. While the air nozzles spray air, the experimental bracket rotates slowly, so that each surface of the workpiece or sample is evenly swept by the air nozzles. This prevents the workpiece from cooling too quickly on a single air-receiving surface, which would cause uneven local cooling rates and ultimately result in uneven mechanical properties of the material.

[0012] An exhaust screen is installed at the exhaust port on the top of the box furnace. The exhaust screen prevents debris from clogging the exhaust port and also ensures that personnel maintain a safe distance.

[0013] The sample holder is a double-layer firing plate. The double-layer firing plate can hold more samples or workpieces, and all of them are within the purging range of the gas nozzle.

[0014] Advantages of utility models

[0015] 1. This utility model changes the current situation where the cooling rate of experimental heat treatment furnaces cannot be precisely adjusted. It adopts a flow valve to control the flow rate of cold air entering the furnace, thereby achieving a cooling function with a specific smooth curve.

[0016] 2. The workpiece or sample of this utility model can rotate inside the furnace and be evenly cooled by the cold air blowing, so that the mechanical properties of each part of the material workpiece are balanced; and the air nozzles form a rectangular array, which can achieve no dead angle blowing on each part of the workpiece or sample, and the blowing uniformity is further improved.

[0017] 3. This utility model can be fully automated by using a PLC in conjunction with thermocouple temperature measurement, eliminating the need for real-time monitoring and saving time and effort. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure inside the furnace cavity;

[0019] Figure 2 This is a schematic diagram of the rear side elevation structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the jet system piping structure;

[0021] Figure 4 This is a schematic diagram of the elevation structure of the sample holder.

[0022] The numbers and component names in the figure are as follows: 1-High-pressure air pump; 2-Drying filter; 3-Solenoid valve; 4-Flow valve; 5-Air nozzle; 6-Motor; 7-Gearbox; 8-Rotating base; 9-Sample holder; 10-Heater; 11-Exhaust check valve; 12-Exhaust mesh cover. Detailed Implementation

[0023] Example 1

[0024] A rotary air-cooled box-type atmosphere furnace is provided. Several gas nozzles 5 are arranged in an array on the inner side of the rear wall of the furnace cavity. A number of flow valves 4 of a matching number are arranged on the outer side of the rear wall of the furnace cavity and connected to the gas nozzles 5 through gas pipes. A sample holder 9 is arranged inside the furnace cavity. Heaters 10 are respectively arranged on the two side walls of the furnace cavity. An exhaust one-way valve 11 is arranged at the exhaust port at the top of the furnace cavity to communicate with the external environment.

[0025] The air inlet of the flow valve 4 is connected to the air outlet of the solenoid valve 3 through a pipe. The air inlet of the solenoid valve 3 is connected to the air outlet of the dryer filter 2. The air inlet of the dryer filter 2 is connected to the high-pressure air pump 1 or the workshop compressed air pipeline.

[0026] A rotating base 8 is provided at the bottom of the furnace cavity of the box furnace. The sample holder 9 is fixed on the rotating base 8. The lower end face of the rotating base 8 is connected to the output shaft of the gearbox 7 through a connecting shaft and a coupling. The input end of the gearbox 7 is connected to the rotating shaft of the motor 6.

[0027] An exhaust screen 12 is installed at the exhaust port on the top of the box furnace.

[0028] The sample holder 9 is double-layered.

Claims

1. A rotary air-cooled box-type atmosphere furnace, characterized in that: A number of gas nozzles (5) are arranged in an array on the inner side of the rear wall of the box furnace cavity. A number of flow valves (4) of a matching number are arranged on the outer side of the rear wall of the furnace cavity and connected to the gas nozzles (5) through gas pipes. A sample holder (9) is arranged in the furnace cavity of the box furnace. Heaters (10) are arranged on both sides of the furnace cavity of the box furnace. An exhaust one-way valve (11) is arranged at the exhaust port at the top of the furnace cavity of the box furnace to communicate with the external environment.

2. The rotary air-cooled box-type atmosphere furnace according to claim 1, characterized in that: The air inlet of the flow valve (4) is connected to the air outlet of the solenoid valve (3) through a pipe. The air inlet of the solenoid valve (3) is connected to the air outlet of the dryer filter (2). The air inlet of the dryer filter (2) is connected to the high-pressure air pump (1) or the workshop compressed air pipeline.

3. The rotary air-cooled box-type atmosphere furnace according to claim 1, characterized in that: The lower part of the furnace cavity of the box furnace is provided with a rotating base (8), and the sample holder (9) is fixed on the rotating base (8). The lower end face of the rotating base (8) is connected to the output shaft of the gearbox (7) through a connecting shaft and a coupling. The input end of the gearbox (7) is connected to the rotating shaft of the motor (6).

4. The rotary air-cooled box-type atmosphere furnace according to claim 1, characterized in that: An exhaust screen (12) is installed at the exhaust port on the top of the box furnace.

5. The rotary air-cooled box-type atmosphere furnace according to claim 1, characterized in that: The sample holder (9) is double-layered.

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