A multifunctional tubular atmosphere heat treatment furnace precision device and heat treatment method thereof

Abstract

The present invention discloses a multifunctional tubular atmosphere heat treatment furnace precision device, which belongs to the technical field of heat treatment furnaces; it solves the technical problems that the heating zone of the existing heating furnace has a large temperature deviation and the atmosphere in the furnace cannot be accurately controlled. The multifunctional tubular atmosphere heat treatment furnace precision device provided by the present invention includes a tubular furnace tube, a cooling unit, a heating temperature control unit and a sample moving unit; along the axial direction of the burning rack tubular furnace tube, the burning rack tubular furnace tube includes a first cooling zone, a heating zone and a second cooling zone connected in sequence, the burning rack cooling unit is arranged on the first cooling zone and the second cooling zone of the burning rack, and the burning rack heating temperature control unit is arranged on the burning rack heating zone; the burning rack sample moving unit is used to move the sample to the heating zone or the first cooling zone and the second cooling zone at its two ends. The present invention realizes the precise regulation and precise control of the temperature and atmosphere in the heat treatment furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of heat treatment furnaces, and in particular to a multifunctional tubular atmosphere heat treatment furnace precision device and a heat treatment method thereof. Background Art

[0002] Heat treatment is the most common heat treatment method in industry and laboratories. It is required in the production and processing of metal materials and structural parts. Heat treatment furnaces are one of the most commonly used heat treatment devices, capable of performing stress relief, atmosphere heat treatment, vacuum heat treatment, and other heat treatments on materials.

[0003] However, existing heat treatment furnaces have simple structures and relatively single functions, and all have shortcomings: 1) There is a temperature deviation in the heating zone; 2) There is a large deviation in the temperature display between the inside and outside of the heating furnace; 3) Under closed conditions, it is difficult to remove or move samples; 4) The function is single and it is impossible to achieve multiple atmosphere heat treatment. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a multifunctional tubular atmosphere heat treatment furnace precision device to solve the technical problems of large temperature deviation in the heating zone of the existing heating furnace and the inability to accurately control the atmosphere in the furnace.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] In one aspect, the present invention provides a multifunctional tubular atmosphere heat treatment furnace precision device, the precision device comprising a tubular furnace tube, a cooling unit, a heating temperature control unit, and a sample moving unit;

[0007] Along the axial direction of the tube furnace tube, the tube furnace tube includes a first cooling zone, a heating zone and a second cooling zone connected in sequence. The cooling unit is arranged on the first cooling zone and the second cooling zone, and the heating temperature control unit is arranged on the heating zone; the sample moving unit is used to move the sample to the heating zone or the first cooling zone and the second cooling zone at both ends.

[0008] In a possible design, the heating zone includes multiple uniform temperature zones; the temperatures of the multiple uniform temperature zones are equal.

[0009] In one possible design, the multiple temperature-averaging zones include a second heating zone, a third heating zone, and a fourth heating zone.

[0010] In one possible design, the sample moving unit includes a burning rack and a push-pull rod;

[0011] The burning rack is installed in the tube furnace tube and is used to carry samples; the first end of the push-pull rod passes through the second cooling zone and is connected to the burning rack; the other end of the push-pull rod is located outside the tube furnace tube and is used to move the burning rack.

[0012] In one possible design, the sample moving unit further includes a retractable metal sleeve;

[0013] The telescopic metal sleeve is arranged at one end of the tubular furnace tube close to the second cooling zone. The telescopic metal sleeve is connected to the tubular furnace tube and has consistent airtightness. The part of the push-pull rod located outside the tubular furnace tube is arranged in the telescopic metal sleeve.

[0014] In one possible design, the burning rack is provided with multiple layers of trays with ventilation holes provided on the trays.

[0015] In one possible design, circular refractory insulation plates are provided at both ends of the burning rack along the axis of the tubular furnace tube; the circular refractory insulation plates are arranged vertically and their outer edges are in contact with the inner wall of the tubular furnace tube. The area enclosed by the circular refractory insulation plates at both ends of the burning rack and the inner wall of the tubular furnace tube constitutes a sample heating zone or a uniform heating zone.

[0016] In a possible design, a temperature measuring unit is also included, which includes a first thermocouple, a second thermocouple, a third thermocouple and a fourth thermocouple; the first to fourth thermocouples are arranged on the outer walls of the furnace in the corresponding first to fourth heating zones.

[0017] In a possible design, the first to fourth thermocouples are each individually equipped with a temperature display.

[0018] On the other hand, the present invention also provides a heat treatment method for a multifunctional tubular atmosphere heat treatment furnace precision device, which uses the multifunctional tubular atmosphere heat treatment furnace precision device to perform heat treatment on a sample.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] (1) The heat treatment furnace of the present invention has a small temperature difference in the constant temperature heating zone, a large uniform temperature zone space, accurate measured temperature, convenient operation and control, and good air tightness. In addition, it can realize one or more atmosphere heat treatments, as well as vacuum heat treatment and humidified atmosphere heat treatment, thereby providing a multifunctional tubular atmosphere heat treatment furnace precision device.

[0021] (2) The present invention provides a sample moving unit in the tube furnace, which can quickly move the heat-treated sample to the first cooling zone or the second cooling zone, while ensuring good sealing of the heat treatment furnace and unchanged atmosphere in the furnace, thereby preventing the entry of air and causing oxidation of the sample surface.

[0022] (3) The present invention can ensure the temperature consistency of the second heating zone to the fourth heating zone by setting a compensation zone; setting three uniform temperature zones can leave enough heating zones for the sample, avoiding the temperature difference caused by the rapid heat dissipation at both ends of the heating zone, thereby ensuring the temperature of the heat treatment furnace is accurate and constant.

[0023] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages will become apparent from the description or be understood through practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the embodiments of the description and the contents particularly pointed out in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of the multifunctional atmosphere heat treatment furnace precision device of the present invention;

[0026] Figure 2 This is a schematic structural diagram of a humidifying unit of a multifunctional atmosphere heat treatment furnace precision device of the present invention;

[0027] Figure 3 This is a schematic structural diagram of the burning rack of the precision device of the multifunctional atmosphere heat treatment furnace of the present invention.

[0028] Reference numerals:

[0029] 1-Tube furnace tube; 2-First heating zone; 3-Second heating zone; 4-Third heating zone; 5-Fourth heating zone; 6-Tray; 7-Push rod; 8-Retractable technical sleeve; 9-Mobile temperature calibration thermocouple; 10-Heating body; 11-First cooling zone; 12-Second cooling zone; 13-Heating control console; 14-Heating vessel; 15-Heating rod; 16-Humidification outlet; 17-Humidification inlet; 18-Water injection port; 19-Gas inlet; 20-Gas chamber; 21-First section of delivery pipe; 22-Second section of delivery pipe; 23-First branch pipe; 24-Second branch pipe; 25-Third branch pipe; 26-First branch pipe Four branches; 27-fifth branch; 28-sixth branch; 29-seventh branch; 30-gas inlet main valve; 31-first air inlet; 32-second air inlet; 33-third air inlet; 34-fourth air inlet; 35-first valve; 36-second valve; 37-third valve; 38-fourth valve; 39-fifth valve; 40-sixth valve; 41-first cooling water inlet; 42-first cooling water outlet; 43-first water-cooling jacket; 44-gas outlet main valve; 45-vacuum tube interface; 46-second cooling water inlet; 47-second cooling water outlet; 48-second water-cooling jacket. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] The present invention provides a multifunctional tubular atmosphere heat treatment furnace precision device, such as Figure 1 As shown, the multifunctional tubular atmosphere heat treatment furnace precision device includes a tubular furnace tube 1, a cooling unit, a heating temperature control unit and a sample moving unit; along the axial direction of the tubular furnace tube 1, the tubular furnace tube 1 includes a first cooling zone 11, a heating zone and a second cooling zone 12 connected in sequence, the cooling unit is arranged on the first cooling zone 11 and the second cooling zone 12, and the heating temperature control unit is arranged on the heating zone; the sample moving unit is used to move the sample to the heating zone or to the first cooling zone 11 and the second cooling zone 12 at both ends thereof.

[0032] Specifically, the tubular furnace tube 1 is a hollow furnace tube placed horizontally, with the two ends of the hollow furnace tube being the first cooling zone 11 and the second cooling zone 12 respectively, and the middle being the heating zone, that is, the first cooling zone 11 and the second cooling zone 12 and the heating zone in the middle constitute a whole furnace tube, and the heating and temperature control unit is arranged on the outer wall of the furnace tube corresponding to the heating zone, and the heating and temperature control unit is used to heat and control the heating zone to ensure that the temperature of the heating zone is uniform and constant; a furnace door of the heat treatment furnace is provided on the end face of the hollow furnace tube close to the first cooling zone 11. When a sample needs to be placed, the furnace door is opened and the sample is placed on the sample moving unit, and the sample moving unit moves the sample to the heating zone or the first cooling zone 11.

[0033] Compared with the prior art, the present invention provides a sample moving unit in the tube furnace tube 1, which can quickly move the heat-treated sample to the first cooling zone 11 or the second cooling zone 12, while ensuring good sealing in the heat treatment furnace and unchanged atmosphere in the furnace chamber, thereby preventing the entry of air and causing oxidation of the sample surface.

[0034] In order to ensure that the temperature in the uniform temperature zone is uniform and constant, the heating and temperature control unit of the present invention includes multiple independent heating and temperature control systems; the heating zone includes a connected heating compensation zone and multiple uniform temperature zones; the temperatures of the multiple uniform temperature zones are equal; and the independent heating and temperature control systems are arranged on the heating compensation zone and each uniform temperature zone.

[0035] Specifically, the temperature control heating unit includes multiple independent heating and temperature control systems, which are respectively arranged in the heating compensation zone and the uniform temperature zone; since cooling zones are provided on both sides of the heating zone, when the temperature of the heating compensation zone is lower than that of the uniform temperature zone, the corresponding independent heating and temperature control system can be turned on to heat it.

[0036] The present invention provides a heating compensation zone to compensate for the heat loss caused by the existence of the cooling zone, thereby ensuring the constant temperature of the uniform temperature zone, making the entire heating zone free of temperature deviation, and ultimately achieving precise temperature control in the heat treatment furnace.

[0037] In order to increase the space of the uniform temperature zone of the heat treatment furnace, the heating compensation zone of the multifunctional atmosphere heat treatment furnace precision device of the present invention includes a first heating zone 2; multiple uniform temperature zones include a second heating zone 3, a third heating zone 4 and a fourth heating zone 5; the first heating zone 2, the first heating zone 2, the second heating zone 3 and the fourth heating zone 5 are adjacent and connected in sequence.

[0038] The uniform temperature zone of the heat treatment furnace in the existing laboratory is relatively small and cannot meet the heat treatment requirements of large-sized samples. The first heating zone 2 close to the cooling zone has a significantly lower temperature due to rapid heat dissipation, which leads to temperature deviation in the entire heating zone.

[0039] Compared with the prior art, the heating zones of the heat treatment furnace precision device of the present invention include the first heating zone 2 to the fourth heating zone 5, wherein the first heating zone 2 is a heating compensation zone, and the second heating zone 3 to the fourth heating zone 5 are all uniform temperature zones. The temperature difference of the uniform temperature zone is controlled within the range of ±2°C. Through the thermal compensation of the heating compensation zone, the temperature of the second heating zone 3 to the fourth heating zone 5 can be guaranteed to be consistent; setting up three uniform temperature zones can leave enough heating zones for the sample, avoiding the temperature difference at both ends of the heating zone due to rapid heat dissipation, which leads to a clear low temperature, and ultimately ensures that the temperature of the heat treatment furnace is accurate and constant. In addition, the total length of the uniform temperature zone of the present invention is as long as 50cm, which can meet the heat treatment requirements of large-size samples.

[0040] The cooling zone of the present invention includes a first cooling zone 11 and a second cooling zone 12; the heating zone includes a first heating zone 2, a second heating zone 3, a third heating zone 4 and a fourth heating zone 5 in sequence; the first cooling zone 11 and the second cooling zone 12 are respectively located at the two ends of the tubular furnace tube 1, and the first cooling zone 11 and the second cooling zone 12 are connected to the first heating zone 2 to the fourth heating zone 5.

[0041] In order to facilitate the movement of samples, the sample moving unit of the present invention includes a burning rack and a push-pull rod 7; the burning rack is arranged in the tube furnace tube 1, and the burning rack is used to carry the sample; the first end of the push-pull rod 7 passes through the second cooling zone 12 and is connected to the burning rack; the push-pull rod 7 is used to move the sample so that it reciprocates in the tube furnace tube 1, for example, moving it to the heating zone or moving it to the first cooling zone 11 or the second cooling zone 12.

[0042] Specifically, a burning rack carrying the sample is arranged in the tube 1 of the tubular furnace. A hook is provided at one end of the burning rack. The first end of the push-pull rod 7 is connected to the burning rack through the hook, and the second end (i.e., the other end) is outside the heat treatment furnace. Pushing or pulling the push-pull rod 7 can make the sample reciprocate in the tubular heat treatment furnace, pushing and pulling the sample into the uniform temperature zone or pushing it away from the uniform temperature zone into the cooling zone.

[0043] It should be noted that the push-pull rod 7 of the present invention is a heat-resistant alloy rod, which can adapt to the furnace environment of the heat treatment furnace.

[0044] In order to ensure the airtightness of the heat treatment furnace during the movement of the sample, the sample moving unit of the present invention also includes a retractable metal sleeve 8; the retractable metal sleeve 8 is arranged at one end of the tubular furnace tube 1 close to the second cooling zone 12, the retractable metal sleeve 8 is connected to the tubular furnace tube 1 and the airtightness of the two is consistent, and the second end of the push-pull rod 7 is arranged in the retractable metal sleeve 8.

[0045] Compared with the prior art, the present invention isolates the push-pull rod 7 from the environment outside the furnace by installing a retractable metal sleeve 8 on the outside of the push-pull rod 7. In a sealed state, the push-pull rod 7 can be operated to push and pull the burning rack, causing it to move back and forth within the heat treatment furnace. Before heating, the sample burning rack is placed in the first heating zone 2 and waited for it to reach temperature before being pushed to the second heating zone 3 to the fourth heating zone 5. After heating, the burning rack can be pushed to the cooling zone for rapid cooling, ensuring that the entire heat treatment process is completed within the sealed heat treatment furnace. When using the heat treatment furnace of the present invention for sample heat treatment, it is simple and convenient to operate and easy to control, and is suitable for heat treatment of various metal samples and parts.

[0046] In order to ensure that the gas is in full contact with the sample during heat treatment, Figure 3 As shown, the roasting rack of the present invention is provided with multiple layers of trays 6, each of which is provided with ventilation holes, which are circular holes with a hole diameter of φ5 to 15 mm.

[0047] Compared with the prior art, the present invention can process samples in batches by configuring the firing rack into a multi-layer tray 6 structure, thereby improving sample processing volume and processing efficiency; in addition, each layer of tray 6 is provided with ventilation holes, which is conducive to full contact between gas and sample.

[0048] In order to avoid heat convection between the heating zone where the burner is located and the surrounding heating zones as much as possible, circular refractory insulation panels are provided at both ends of the burner along the axial direction of the tubular furnace tube 1; the circular refractory insulation panels are arranged vertically, and the outer walls of the circular refractory insulation panels are in contact with the inner walls of the tubular furnace tube 1. The inner walls of the tubular furnace tube 1 and the circular refractory insulation panels at both ends of the burner constitute the sample insulation zone.

[0049] Compared with the prior art, the present invention utilizes circular refractory insulation plates and the inner wall of the furnace tube to form a sample heating zone or a uniform temperature zone, which can minimize heat convection between the heating zone where the burner is located and the surrounding heating zones, thereby ensuring uniform heating of the sample.

[0050] In order to improve the accuracy of temperature measurement, the multifunctional tubular atmosphere heat treatment furnace precision device of the present invention also includes a temperature measuring unit, which includes a first thermocouple, a second thermocouple and a third thermocouple; the first to third thermocouples are correspondingly arranged on the outer walls of the furnace corresponding to the second heating zone 3 to the fourth heating zone 5 (that is, the first thermocouple is arranged on the outer wall of the furnace corresponding to the first heating zone 2, the second thermocouple is arranged on the outer wall of the furnace corresponding to the second heating zone 3, the third thermocouple is arranged on the outer wall of the furnace corresponding to the third heating zone 4, and the fourth thermocouple is arranged on the outer wall of the furnace corresponding to the fourth heating zone 5), and the first to fourth thermocouples are each separately equipped with a temperature display.

[0051] The existing technology only measures the temperature in the middle of the heating zone, making it difficult to ensure the same temperature in different heating zones. Compared with the existing technology, the present invention installs thermocouples on the outer wall of the furnace tube corresponding to the first heating zone 2 to the fourth heating zone 5. This can measure the real-time temperature of each heating zone and maintain the temperature of the uniform temperature zone constant through heating compensation.

[0052] In order to further improve the temperature control accuracy of the functional tubular atmosphere heat treatment furnace precision device, the temperature measuring unit of the present invention also includes a movable temperature calibration thermocouple 9; one end of the movable temperature calibration thermocouple 9 is arranged inside the tubular furnace tube 1, and the other end is arranged outside the tubular furnace tube 1. The movable temperature calibration thermocouple 9 is used to measure the temperature of the heating zone in real time.

[0053] The movable temperature calibration thermocouple 9 includes a thin-walled quartz blind tube and a thermocouple, wherein the thermocouple is arranged in the thin-walled quartz blind tube, that is, the thermocouple is inserted from the open end of the quartz tube, and the quartz tube is inserted from the right end of the hollow furnace tube, that is, one end located in the second cooling zone 12, and passes through the first heating zone 2 to the fourth heating zone 5, that is, the blind end of the quartz tube is at the leftmost end of the uniform temperature zone, and the thermocouple is inserted from the open end of the quartz tube.

[0054] It should be noted that the connection line of the movable temperature calibration thermocouple 9 is outside the furnace body, and the thermocouple is movable in the quartz tube to detect the temperatures of the first heating zone 2 to the fourth heating zone 5 .

[0055] Existing heat treatment furnaces typically use thermocouples on the outer wall of the furnace tube to measure temperature. This results in large deviations between the internal and external temperature displays, and the lack of temperature calibration thermocouples. Compared to the existing technology, the present invention utilizes a movable temperature calibration thermocouple 9 to monitor the real-time temperature of the uniform temperature zone within the furnace. When the temperature inside the furnace tube falls below the set temperature, the heating and temperature control system activates heating to ensure a constant temperature in the uniform temperature zone.

[0056] In addition, the above-mentioned multiple independent heating and temperature control systems include the first heating body 10 to the fourth heating body 10 and the first temperature control system to the fourth temperature control system; the first heating body 10 and the first temperature control system are arranged on the outer wall of the furnace tube corresponding to the first heating zone 2. Similarly, the second heating body 10 and the second temperature control system are arranged on the outer wall of the furnace tube corresponding to the second heating zone 3, the third heating body 10 and the third temperature control system are arranged on the outer wall of the furnace tube corresponding to the third heating zone 4, and the fourth heating body 10 and the fourth temperature control system are arranged on the outer wall of the furnace tube corresponding to the fourth heating zone 5; the first heating body 10 to the fourth heating body 10 all use silicon carbon rods, and the first temperature control system to the fourth temperature control system all use existing temperature control programs for temperature control.

[0057] Compared with the prior art, the present invention divides the heating zone of the tubular furnace tube 1 into four sections, and sets a heating body 10 on the outer wall of the furnace corresponding to each heating zone, which controls the temperature separately. At the set temperature required in the furnace, the four heating zones can heat together to ensure that the temperature of the uniform temperature zone is consistent, ultimately solving the temperature difference problem.

[0058] The multifunctional tubular atmosphere heat treatment furnace precision device of the present invention also includes a humidifying unit, such as Figure 2 As shown, the humidification unit adopts a water bath humidifier, wherein the water bath humidifier is connected to the interior of the tube furnace tube 1, that is, it is connected to the heating zone and the cooling zones at both ends; the water bath humidifier includes a heating control console 13, a heating vessel 14 and a plurality of heating rods 15; wherein, the heating vessel 14 is arranged on the heating control console 13 and is control-connected thereto, and a humidification air outlet 16 and a water injection port 18 are provided on the top of the heating vessel 14, and the water injection port 18 is sealed by a sealing plug; a humidification air inlet 17 is provided on the side wall near the bottom of the heating vessel 14, and the heating control console 13 is used to control the heating rods 15 to heat the water in the heating vessel 14.

[0059] The multifunctional tubular atmosphere heat treatment furnace precision device of the present invention also includes a gas supply unit 19; the gas supply unit 19 includes a gas inlet, a gas warehouse 20, a first section delivery pipe 21 and a second section delivery pipe 22; the gas inlet is connected to the bottom end of the gas warehouse 20 through the first section delivery pipe 21, and the top end of the gas warehouse 20 is connected to the tubular furnace tube 1 through the second section delivery pipe 22. A gas inlet main valve 30 is provided on the above-mentioned first section delivery pipe 21. Opening the gas inlet main valve 30 can provide the atmosphere required for heat treatment.

[0060] It should be noted that when multiple atmospheres are used for heat treatment, the multiple atmospheres are first fully mixed using the gas chamber 20, and then the mixed multiple atmospheres are introduced into the heat treatment furnace.

[0061] In order to achieve multiple atmosphere heat treatments, the gas inlet of the present invention includes a first air inlet 31, a second air inlet 32, a third air inlet 33 and a fourth air inlet 34 and a gas inlet main valve 30; the first air inlet 31 is connected to the first section of the delivery pipe 21 through the first branch pipe 23, the second air inlet 32 ​​is connected to the first section of the delivery pipe 21 through the second branch pipe 24, the third air inlet 33 is connected to the first section of the delivery pipe 21 through the third branch pipe 25, and the fourth air inlet 34 is connected to the first section of the delivery pipe 21 through the fourth branch pipe 26; in addition, the fourth air inlet 34 is connected to the humidification air inlet 17 of the water area humidifier through the fifth branch pipe 27, and the water bath humidifier is connected to the first section of the delivery pipe 21 through the sixth branch pipe 28. A first valve 35 and a first numerical control flowmeter are provided on the first branch pipe 23, a second valve 36 and a second numerical control flowmeter are provided on the second branch pipe 24, a third valve 37 and a third numerical control flowmeter are provided on the third branch pipe 25, a fourth valve 38 and a fourth numerical control flowmeter are provided on the fourth branch pipe 26, and a fifth valve 39 and a fifth numerical control flowmeter are provided on the fifth branch pipe 27; the first valve 35 to the fourth valve 38 are closed, and the fifth valve 39 is opened at the same time, and the gas provided by the fourth air inlet 34 enters the tubular furnace tube 1 through the water area humidifier, the sixth branch pipe 28, the gas warehouse 20 and the second section of the delivery pipe 22.

[0062] Compared with the prior art, the present invention sets up multiple air inlets and equips each air inlet with a digitally controlled flow meter and a valve, which can accurately control the atmosphere ratio and can perform both single atmosphere heat treatment and multiple atmosphere heat treatment.

[0063] It should be noted that the outer wall of the furnace tube corresponding to the first cooling zone 11 of the present invention is provided with a first cooling water inlet 41, a first cooling water outlet 42, a first water-cooling jacket 43, and a seventh branch pipe 29. The seventh branch pipe 29 is provided with a main gas outlet valve 44 and a vacuum pipe interface 45, and the vacuum pipe interface 45 is provided with a sixth valve 40. In addition, the outer wall of the furnace tube corresponding to the second cooling zone 12 is provided with a second cooling water inlet 46, a second cooling water outlet 47, and a second water-cooling jacket 48.

[0064] In summary, the multifunctional tubular atmosphere heat treatment furnace precision device provided by the present invention has a simple structure, convenient heat treatment operation, easy placement and removal of samples, precise temperature control, a large uniform temperature zone space with constant temperature and small temperature difference, and is suitable for heat treatment of various metal materials and structural parts.

[0065] Example 1

[0066] This example performs a single atmosphere heat treatment on the sample:

[0067] Step 1: Turn on the power and set the heating temperature and time through the heating temperature control unit;

[0068] Step 2: Open the furnace door, move the burning rack to the first cooling zone 11 by pushing and pulling the rod 7, place the sample to be heat treated on the burning rack tray 6, and close the furnace door;

[0069] Step 3: Open any air inlet valve, the air inlet main valve, and the air outlet main valve from the first valve 35 to the fourth valve 38, close the other air inlet valves, introduce the required gas type according to the heat treatment requirements, and adjust the gas flow rate through the digital control flow meter;

[0070] Step 4: Depending on the heat treatment requirements, select the heat treatment method of heating with the furnace or entering the furnace after reaching the temperature. When the heat treatment method is selected, first move the burning rack to the heating uniform temperature zone (the second heating zone 3 to the fourth heating zone 5) using the push-pull rod 7, and then start the heating program; when the heat treatment method is selected, first start the heating program, and after reaching the temperature, move the burning rack to the heating uniform temperature zone (the second heating zone 3 to the fourth heating zone 5) using the push-pull rod 7;

[0071] Step 5. After heat treatment, turn off the heating program and select the required cooling method. If you choose to cool quickly in the cooling zone, move the burning rack to the cooling zone for cooling. If you choose to cool with the furnace, just turn off the power without moving the burning rack.

[0072] Example 2

[0073] In this embodiment, the samples were subjected to heat treatment in various atmospheres.

[0074] Step 1: Turn on the power and set the heating temperature and time through the heating temperature control unit;

[0075] Step 2: Open the furnace door, move the burning rack to the first cooling zone 11 by pushing and pulling the rod 7, place the sample to be heat treated on the burning rack tray 6, and close the furnace door;

[0076] Step 3: Open any two air inlet valves, the air inlet main valve, and the air outlet main valve from the first valve 35 to the fourth valve 38, close the other air inlet valves, introduce the required gas type and atmosphere ratio according to the heat treatment requirements, and adjust the gas flow rate through the CNC flow meter;

[0077] Step 4: Start the program and select the required method for heat treatment heating and cooling.

[0078] Example 3

[0079] In this embodiment, vacuum heat treatment of the sample is performed.

[0080] Step 1: Turn on the power and set the heating temperature and time through the heating temperature control unit;

[0081] Step 2: Open the furnace door, move the burning rack to the first cooling zone 11 by pushing and pulling the rod 7, place the sample to be heat treated on the burning rack tray 6, and close the furnace door;

[0082] Step 3: Close the main valve and the outlet main valve, open the sixth valve 40, and connect the vacuum tube interface 45 to the vacuum pump;

[0083] Step 4: Start the program and select the required method for heat treatment heating and cooling.

[0084] Example 4

[0085] This example uses wet atmosphere heat treatment

[0086] Step 1: Turn on the power and set the heating temperature and time through the heating temperature control unit;

[0087] Step 2: Open the furnace door, move the burning rack to the first cooling zone 11 by pushing and pulling the rod 7, place the sample to be heat treated on the burning rack tray 6, and close the furnace door;

[0088] Step 3: Open the main air inlet valve and the fifth valve 39, close the first valve 35 to the fourth valve 38, and the air inlet valve ①, and bring the water vapor generated by the water bath humidifier into the heat treatment furnace through the gas;

[0089] Step 4: Monitor the dew point using a dew point meter and adjust the temperature of the humidification unit;

[0090] Step 5: Start the program and select the required method for heat treatment heating and cooling.

[0091] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A multifunctional tubular atmosphere heat treatment furnace precision device, characterized in that, It includes a tube furnace tube, a cooling unit, a heating and temperature control unit, a temperature measuring unit and a sample moving unit; Along the axial direction of the tube furnace tube, the tube furnace tube includes a first cooling zone, a heating zone, and a second cooling zone connected in sequence, the cooling unit is provided on the first cooling zone and the second cooling zone, and the heating temperature control unit is provided on the heating zone; the sample moving unit is used to move the sample to the heating zone or the first cooling zone and the second cooling zone at both ends; The heating zone includes a connected heating compensation zone and multiple temperature-averaging zones; the temperatures of the multiple temperature-averaging zones are equal; independent heating and temperature control systems are installed in the heating compensation zone and each temperature-averaging zone. Since cooling zones are provided on both sides of the heating zone, when the temperature of the heating compensation zone is lower than that of the temperature-averaging zone, the corresponding independent heating and temperature control system can be turned on to heat it; A heating compensation zone is set up to compensate for the heat loss caused by the existence of the cooling zone, thereby ensuring the temperature of the uniform temperature zone is constant and there is no temperature deviation in the entire heating zone; the temperature difference of the uniform temperature zone is controlled within the range of ±2°C; The total length of the uniform temperature zone is up to 50cm, which can meet the heat treatment requirements of large-sized samples; The sample moving unit includes a burning rack and a push-pull rod; A retractable metal sleeve is set on the outside of the push-pull rod to isolate the entire push-pull rod from the environment outside the furnace. In the sealed state, the push-pull rod can be operated to push and pull the burning rack to make it move back and forth in the heat treatment furnace; The burning rack is provided with a multi-layer tray, each of which is provided with a vent hole; circular refractory insulation plates are provided at both ends of the burning rack along the axis of the tube furnace tube; the circular refractory insulation plates are arranged vertically and their outer edges are in contact with the inner wall of the tube furnace tube, and the area enclosed by the circular refractory insulation plates at both ends of the burning rack and the inner wall of the tube furnace tube constitutes a sample heating area or a soaking area; The temperature measurement unit also includes a movable temperature-calibration thermocouple; one end of the movable temperature-calibration thermocouple is located inside the tube of the tubular furnace, and the other end is located outside the tube of the tubular furnace. The movable temperature-calibration thermocouple is used to measure the temperature of the heating zone in real time; the connection line of the movable temperature-calibration thermocouple is outside the furnace body, and the thermocouple is movable within the quartz tube to detect the temperature of the first heating zone to the fourth heating zone; The multifunctional tubular atmosphere heat treatment furnace precision device also includes a humidifying unit and a gas supply unit.

2. The multifunctional tubular atmosphere heat treatment furnace precision device according to claim 1 is characterized in that: The plurality of uniform temperature zones include a second heating zone, a third heating zone and a fourth heating zone.

3. The multifunctional tubular atmosphere heat treatment furnace precision device according to claim 1, characterized in that: The burning rack is arranged inside the tube furnace tube and is used to carry samples; the first end of the push-pull rod passes through the second cooling zone and is connected to the burning rack; the other end of the push-pull rod is located outside the tube furnace tube and is used to move the burning rack.

4. The multifunctional tubular atmosphere heat treatment furnace precision device according to claim 3, characterized in that: The retractable metal sleeve is arranged at one end of the tube furnace tube close to the second cooling zone. The retractable metal sleeve is connected to the tube furnace tube and has consistent air tightness. The part of the push-pull rod located outside the tube furnace tube is arranged in the retractable metal sleeve.

5. The multifunctional tubular atmosphere heat treatment furnace precision device according to claim 1, characterized in that: The temperature measuring unit includes a first thermocouple, a second thermocouple, a third thermocouple and a fourth thermocouple; the first to fourth thermocouples are arranged on the outer walls of the furnace in the corresponding first to fourth heating zones.

6. The multifunctional tubular atmosphere heat treatment furnace precision device according to claim 5, characterized in that: The first to fourth thermocouples are each individually equipped with a temperature display.

7. A heat treatment method for a precision device of a multifunctional tubular atmosphere heat treatment furnace, characterized in that: The sample heat treatment is carried out using the multifunctional tubular atmosphere heat treatment furnace precision device described in any one of claims 1 to 6.

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