Heat treatment device with uniform cooling function

Abstract

The invention relates to the technical field of heat treatment, in particular to a uniform cooling heat treatment device which comprises an industrial personal computer, a smelting furnace, a cold air pipeline and an air guide pipe, the air guide pipe is composed of a straight pipe and an arc-shaped pipe, the straight pipe is connected to the middle of the arc-shaped pipe, and two pipe openings of the arc-shaped pipe face a machined part; a connecting pipe is fixed to an air guide opening of the cold air pipeline, the connecting pipe is sleeved with a straight pipe, and the straight pipe is sleeved with a first gear; a coupler penetrates through a furnace body of the smelting furnace, the end, located on the outer side of the furnace body, of the coupler is connected with a motor rotating shaft of a driving motor, the end, located on the inner side of the furnace body, of the coupler is connected with a driving shaft, and the driving shaft is sleeved with a second gear meshed with the first gear. The industrial personal computer is connected with the driving motor. According to the precise cooling device, precise cooling is achieved, meanwhile, metal performance damage caused by sudden temperature drop is avoided, and the performance of a machined part is precisely guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, and in particular to a heat treatment device. Background Art

[0002] Most existing heat treatment devices introduce cold air into the furnace through the air inlet on the furnace to cool down the workpiece during the cooling stage of the heat treatment. The following problems are common: 1. The position of the air inlet is fixed, resulting in a fast cooling rate at the position of the workpiece facing the air inlet, which is prone to cracking; 2. The number of air inlets is limited. Although increasing the number of air inlets can improve the uniformity of the temperature in the furnace, it will sacrifice the strength and thermal insulation of the furnace; 3. When low-temperature gas is directly introduced into the furnace, there is a sudden temperature change, and the workpiece is prone to cracking. Summary of the invention

[0003] The object of the present invention is to provide a heat treatment device with uniform temperature reduction to solve at least the above-mentioned technical problems.

[0004] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0005] A uniformly cooled heat treatment device comprises an industrial computer, a furnace, and a cold air pipeline, wherein the cold air pipeline comprises an air delivery pipe arranged outside the furnace and an air guide port opened on the side wall of the furnace, wherein the air delivery pipe is connected to the air guide port via an electric control valve; the industrial computer controls the connection to the electric control valve;

[0006] A "Y"-shaped air guide pipe is provided in the furnace, and the air guide pipe consists of a straight pipe and an arc-shaped pipe, the straight pipe is connected to the middle of the arc-shaped pipe, and the two pipe openings of the arc-shaped pipe face the workpiece;

[0007] A connecting pipe is fixed on the air guide port, the straight pipe is disposed on the outer sleeve of the connecting pipe, and the first gear is disposed on the outer sleeve of the straight pipe;

[0008] A coupling is passed through the furnace body of the melting furnace, one end of the coupling located outside the furnace body is connected to the motor shaft of the driving motor, and one end of the coupling located inside the furnace body is connected to the driving shaft, a second gear is sleeved on the driving shaft, and the second gear engages with the first gear;

[0009] A control signal output port of the industrial computer is connected to the drive motor;

[0010] The industrial computer controls the driving motor to rotate, so that the motor shaft of the driving motor drives the second gear to rotate through the coupling, the second gear drives the first gear to rotate, and the first gear drives the straight tube to rotate, thereby changing the positions of the two pipe openings of the arc tube.

[0011] Innovations: 1. The position of the cold air outlet of the present invention changes continuously with the rotation of the drive motor. Compared with the design in the prior art where the position of the cold air outlet remains unchanged, on the one hand, it can effectively drive the gas flow in the furnace, thereby making the temperature in the furnace more uniform; on the other hand, it can avoid the problem of fast local cooling rate and easy cracking caused by the workpiece being partially facing the cold air outlet for a long time. 2. Because the position of the cold air outlet is constantly changing, the area to which the cold air can be directly delivered is larger, so the number of air guide ports can be reduced, thereby ensuring the structural strength of the furnace. 3. Because the position of the cold air outlet is adjustable, the cooling rate of the local position in the furnace can be adjusted by adjusting the position of the cold air outlet.

[0012] Preferably, the first gear and the second gear are both bevel gears, the central axis of the first gear is parallel to the central axis of the second gear, the outer diameter of the conical surface of the first gear increases as it is closer to the furnace body, and the outer diameter of the conical surface of the second gear decreases as it is closer to the furnace body, and the conical surface of the second gear presses the conical surface of the first gear toward the furnace body.

[0013] Innovation: In the prior art, the central axes of the two bevel gears are mostly perpendicular to each other, and the purpose of use is to change the direction of the gear shaft, while the central axes of the bevel gears of the present invention are parallel to each other, and the purpose of use is to use the second gear to limit the position of the first gear, thereby preventing the air duct from escaping from the connecting pipe, and allowing no additional limit mechanism to be set between the connecting pipe and the air duct. Therefore, when the present invention uses bevel gears, the purpose of use, the position of the bevel gears, and the use effect are all different from the prior art, which is a new application of bevel gears and overcomes the technical bias of the prior art.

[0014] Preferably, it further comprises a gas storage tank disposed outside the furnace, the gas storage tank being connected to the gas pipeline, the gas storage tank being provided with a temperature sensor system, and the temperature sensor system being connected to the industrial computer;

[0015] It also includes a heat exchanger arranged outside the furnace, the heat exchanger has a heating pipe, the exhaust port of the furnace is connected to the heating pipe, the heat exchange fins of the heat exchanger are arranged in the gas storage tank, the air inlet of the heating pipe is provided with an electric valve, and the industrial computer controls the connection of the electric valve;

[0016] The waste heat from the exhaust port of the furnace heats the gas in the gas storage tank;

[0017] The industrial computer controls the gas temperature in the gas tank through the temperature sensor system and the electric valve, and controls the temperature in the gas tank between one fiftieth and one tenth of the temperature in the furnace.

[0018] Innovation: The present invention does not directly introduce cooling gas, but uses the waste heat of the gas in the furnace to adjust the temperature of the cooling gas before introducing it through a heat exchanger. Therefore, there will be no sudden drop in temperature in the furnace, which can effectively solve the problem of cracking of the workpiece caused by sudden temperature drop.

[0019] Preferably, it further comprises an infrared temperature imager, and the signal input port of the industrial computer is connected to the infrared temperature imager;

[0020] An observation window is provided on the furnace body of the melting furnace, and quartz glass is inlaid on the observation window; the infrared temperature imager is located outside the furnace body, and the infrared temperature imager has an imaging lens, and a light-transmitting tube with light shielding by the tube wall is provided in front of the imaging lens, and the viewing window of the light-transmitting tube faces the quartz glass of the observation window;

[0021] In the process of cooling the workpiece, the industrial computer analyzes and determines the location of the high-temperature area based on the temperature image of the workpiece captured by the infrared temperature imager. The high-temperature area refers to the area that is 5 degrees Celsius higher than the average temperature of the workpiece in a temperature image.

[0022] First, the industrial computer controls the drive motor to rotate the arc tube so that one of the tube openings of the arc tube faces or is close to the high-temperature area of ​​the workpiece. Then the industrial computer increases the ventilation volume of the electric control valve corresponding to the arc tube until the temperature difference between the high-temperature area and the average temperature of the workpiece is no more than 5 degrees Celsius.

[0023] Innovation: The existing technology mostly uses temperature sensors to detect temperature changes in the furnace. When using temperature sensors to detect the temperature in the furnace, the temperature sensors are often fixed on the side walls of the furnace. On the one hand, there is a difference in thermal conductivity between the side walls of the furnace and the air in the furnace. On the other hand, there is a difference in the temperature of the side walls of the furnace and the temperature of the air in the furnace, which leads to untimely and inaccurate actual measurement results. More importantly, it is impossible to measure the temperature of the surface of the casting. The present invention uses an infrared temperature imager to detect temperature changes in the furnace. Not only are the measurement results timely and accurate, but the temperature of the surface of the casting can also be measured.

[0024] Beneficial effect: The present invention achieves precise cooling while avoiding damage to metal properties caused by sudden temperature drop, and accurately guarantees the performance of the processed parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 It is a partial structural schematic diagram of the present invention;

[0027] Figure 2 for Figure 1 A top view of the structure in the middle;

[0028] Figure 3 A schematic diagram of the structure of the airway;

[0029] Figure 4 Another structural schematic diagram of the airway. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 A heat treatment device for uniform cooling includes an industrial computer, a furnace, a cold air pipeline, an infrared temperature imager, a gas storage tank, and a heat exchanger. A heat treatment device for uniform cooling includes a furnace 1 and a cold air pipeline. The cold air pipeline includes a gas pipeline 5 arranged outside the furnace 1 and a gas guide port opened on the side wall of the furnace 1. The gas pipeline 5 is connected to the gas guide port through an electric control valve 4. The industrial computer controls the connection of the electric control valve.

[0032] A "Y"-shaped air duct is provided in the furnace. The air duct consists of a straight tube and an arc tube 6. The straight tube is connected to the middle of the arc tube 6, and the two pipe openings of the arc tube 6 face the workpiece. A connecting pipe is fixed on the air duct, and a straight tube is provided on the outer sleeve of the connecting pipe, and a first gear 7 is provided on the outer sleeve of the straight tube. A coupling runs through the furnace body of the furnace. The end of the coupling located on the outer side of the furnace body is connected to the motor shaft of the drive motor 9, and the end of the coupling located on the inner side of the furnace body is connected to the drive shaft. The drive shaft is provided with a second gear 8, and the second gear 8 engages with the first gear 7. A control signal output port of the industrial computer is connected to the drive motor 9. The industrial computer controls the drive motor 9 to rotate, so that the motor shaft of the drive motor 9 drives the second gear 8 to rotate through the coupling, the second gear 8 drives the first gear 7 to rotate, and the first gear 7 drives the straight tube to rotate, thereby changing the position of the two pipe openings of the arc tube 6. Usage: The industrial computer controls the driving motor 9 to rotate, so that the motor shaft of the driving motor 9 drives the second gear 8 to rotate through the coupling, the second gear 8 drives the first gear 7 to rotate, and the first gear 7 drives the straight tube to rotate, thereby changing the positions of the two pipe openings of the arc tube 6 (the outlet of the cooling gas, referred to as the cold air outlet).

[0033] The arc tube 6 is preferably an arc tube, and the radius of the circle where the arc is located is smaller than the radius of the circle where the inner wall of the furnace is located, and larger than two-thirds of the radius of the circle where the inner wall of the furnace is located. Therefore, the arc tube 6 can rotate more smoothly, cover a larger area, and have a distance from the workpiece. Preferably, the distance between the mouth of the arc tube 6 and the workpiece is 20-50cm. While avoiding gas impact, the gas has a certain diffusion space. The aviation workpiece has a transition space for slow temperature strain. It avoids damage to metal properties caused by local temperature drops and accurately guarantees the performance of aviation workpieces.

[0034] The first gear 7 and the second gear 8 can be ordinary gears, such as Figure 3 However, preferably, the first gear 7 and the second gear 8 are both bevel gears, such as Figure 4 The central axis of the first gear 7 is parallel to the central axis of the second gear 8, the outer diameter of the conical surface of the first gear 7 increases as it approaches the furnace body, and the outer diameter of the conical surface of the second gear 8 decreases as it approaches the furnace body, and the conical surface of the second gear 8 presses the conical surface of the first gear 7 toward the furnace body.

[0035] The number of cooling air pipelines can be set according to demand, preferably more than three. Figure 1 , Figure 2 There are nine of them, which is the preferred solution. The nine air guide ports are divided into three groups, with three in each group. The three groups of air guide ports are located at three different heights of the furnace 1. The air guide ports in the same group are arranged at equal intervals, and the air guide ports in different groups are staggered up and down. In solution 1, each gas transmission pipe 5 extends vertically downward from the air guide port, and finally, surrounds the outside of the furnace 1 at equal intervals, such as Figure 1 As shown. In Scheme 2, the gas pipe 5 connected to the group of gas guide ports located at the top is spirally coiled outside the furnace body and coiled downward from the gas guide ports; the gas pipe 5 connected to the group of gas guide ports located in the middle is spirally coiled outside the furnace body and coiled downward from the gas guide ports; the gas pipe 5 connected to the group of gas guide ports located at the bottom is spirally coiled outside the furnace body and coiled upward from the gas guide ports. Scheme 2 increases the length of the gas pipe outside the furnace body by spiral coiling. The gas pipe can be heated by the temperature of the furnace body, and then the cooling gas in the gas pipe is heated. At the same time, the gas pipe is used to cool the furnace body, thereby cooling the workpiece in the furnace, and finally alleviating the temperature drop. In addition, Scheme 2 also optimizes the coiling direction of the gas pipe 5. Compared with the conventional method of coiling in one direction, it can effectively increase the distribution uniformity of the gas pipe outside the furnace body and avoid the situation where there is no gas pipe on the top when all are coiled downward.

[0036] There are three observation windows 3, all located above the middle group of air guide ports. The field of view is wider here, and the temperature image of the surface of the workpiece can be captured more comprehensively. In addition, the air pipe 5 forms a surrounding structure for the infrared temperature imager, which is conducive to the cooling of the infrared temperature imager and the pan / tilt.

[0037] The gas tank 2 is connected to the gas pipeline 5. The heat exchanger has a heating pipeline, the exhaust port of the furnace 1 is connected to the heating pipeline, and the heat exchange fins of the heat exchanger are arranged in the gas tank 2. The gas tank 2 is also provided with a temperature sensor system, and the temperature sensor system is connected to the industrial computer. The air inlet of the heating pipeline is provided with an electric valve, and the industrial computer controls the connection of the electric valve. The waste heat from the exhaust port of the furnace 1 heats the gas in the gas tank 2. The industrial computer controls the gas temperature in the gas tank 2 through the temperature sensor system and the electric valve, and controls the temperature in the gas tank 2 to be between one fiftieth and one tenth of the temperature in the furnace 1. In this way, the temperature of the gas ejected from the nozzle controlled by the industrial computer will not be too low, while achieving precise cooling, it also avoids the damage to the metal properties caused by the sudden drop in temperature, and accurately guarantees the performance of the processed parts.

[0038] The number of infrared temperature imagers can be set as needed, preferably three. Figure 1 In the embodiment, three observation windows 3 are provided on the furnace body of the melting furnace 1, and quartz glass is inlaid on the observation windows 3; the number of infrared temperature imagers is the same as the number of observation windows 3, and they correspond one to one; the infrared temperature imager is located outside the furnace body, and the infrared temperature imager has an imaging lens, and a light-transmitting tube with a tube wall shielding is provided in front of the imaging lens, and the viewing window of the light-transmitting tube faces the quartz glass of the observation window 3, and the length of the light-transmitting tube is 2cm-6cm, and the area of ​​the observation window 3 is at least 3 times the area of ​​the tube mouth of the light-transmitting tube. A pan-tilt can also be provided outside the melting furnace 1, and the number of pan-tilts is the same as the number of infrared temperature imagers, and the infrared imagers are fixed on the pan-tilts one by one. The control signal output port of the industrial computer is connected to the pan-tilt, and the pan-tilt drives the direction angle change of the light-transmitting tube to be not less than 40 degrees up and down, and not less than 20 degrees left and right, and within the angle change range, the viewing window of the light-transmitting tube always faces the quartz glass, ensuring that the infrared temperature imager always captures the temperature imaging of the workpiece in the furnace body.

[0039] Usage: The signal input port of the industrial computer is connected to the infrared temperature imager. In the process of cooling the workpiece, the industrial computer analyzes and determines the location of the high temperature area based on the temperature image of the workpiece captured by the infrared temperature imager. The high temperature area refers to the area that is 5 degrees Celsius higher than the average temperature of the workpiece in a temperature image. First, the industrial computer controls the drive motor 9 to rotate the arc tube 6 so that one of the pipe openings of the arc tube faces or approaches the high temperature area of ​​the workpiece, and then the industrial computer increases the ventilation volume of the electric control valve corresponding to the arc tube until the temperature difference between the high temperature area and the average temperature of the workpiece is not higher than 5 degrees Celsius. When the industrial computer analyzes and determines that there is no high temperature area based on the temperature image of the workpiece captured by the infrared temperature imager, or when the temperature of the workpiece in the furnace cannot be known, the industrial computer controls the drive motor 9 to rotate the arc tube at a uniform speed, so that the position of the arc tube is constantly adjusted while the cold air is discharged.

[0040] Preferably, the rotating shaft of the coupling is mounted on the furnace body through a labyrinth sealing bearing; the labyrinth sealing bearing includes an outer ring, an inner ring, and a labyrinth sealing layer; the outer ring passes through the furnace body and is fixed on the furnace body; the rotating shaft of the coupling passes through the inner ring and is fixedly connected to the inner ring.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A heat treatment device for uniform cooling, comprising an industrial computer, a furnace, and a cold air pipeline, wherein the cold air pipeline comprises an air delivery pipe arranged outside the furnace and an air guide port opened on the side wall of the furnace, wherein the air delivery pipe is connected to the air guide port through an electric control valve; the industrial computer controls the connection to the electric control valve; and the characteristics are: A "Y"-shaped air guide pipe is provided in the furnace, and the air guide pipe consists of a straight pipe and an arc-shaped pipe, the straight pipe is connected to the middle of the arc-shaped pipe, and the two pipe openings of the arc-shaped pipe face the workpiece; A connecting pipe is fixed on the air guide port, the straight pipe is disposed on the outer sleeve of the connecting pipe, and the first gear is disposed on the outer sleeve of the straight pipe; A coupling is passed through the furnace body of the melting furnace, one end of the coupling located outside the furnace body is connected to the motor shaft of the driving motor, and one end of the coupling located inside the furnace body is connected to the driving shaft, a second gear is sleeved on the driving shaft, and the second gear engages with the first gear; A control signal output port of the industrial computer is connected to the drive motor; The industrial computer controls the driving motor to rotate, so that the motor shaft of the driving motor drives the second gear to rotate through the coupling, the second gear drives the first gear to rotate, and the first gear drives the straight tube to rotate, thereby changing the positions of the two pipe openings of the arc tube.

2. A uniformly cooled heat treatment device according to claim 1, characterized in that: The first gear and the second gear are both bevel gears, the central axis of the first gear is parallel to the central axis of the second gear, the outer diameter of the conical surface of the first gear increases as it is closer to the furnace body, and the outer diameter of the conical surface of the second gear decreases as it is closer to the furnace body, and the conical surface of the second gear presses the conical surface of the first gear toward the furnace body.

3. The uniform cooling heat treatment device according to claim 1, characterized in that: It also includes a gas storage tank disposed outside the furnace, the gas storage tank is connected to the gas pipeline, a temperature sensor system is disposed on the gas storage tank, and the temperature sensor system is connected to the industrial computer; It also includes a heat exchanger arranged outside the furnace, the heat exchanger has a heating pipe, the exhaust port of the furnace is connected to the heating pipe, the heat exchange fins of the heat exchanger are arranged in the gas storage tank, the air inlet of the heating pipe is provided with an electric valve, and the industrial computer controls the connection of the electric valve; The waste heat from the exhaust port of the furnace heats the gas in the gas storage tank; The industrial computer controls the gas temperature in the gas tank through the temperature sensor system and the electric valve, and controls the temperature in the gas tank between one fiftieth and one tenth of the temperature in the furnace.

4. The uniform cooling heat treatment device according to claim 1, characterized in that: It also includes an infrared temperature imager, and the signal input port of the industrial computer is connected to the infrared temperature imager; An observation window is provided on the furnace body of the melting furnace, and quartz glass is inlaid on the observation window; the infrared temperature imager is located outside the furnace body, and the infrared temperature imager has an imaging lens, and a light-transmitting tube with light shielding by the tube wall is provided in front of the imaging lens, and the viewing window of the light-transmitting tube faces the quartz glass of the observation window; In the process of cooling the workpiece, the industrial computer analyzes and determines the location of the high-temperature area based on the temperature image of the workpiece captured by the infrared temperature imager. The high-temperature area refers to the area that is 5 degrees Celsius higher than the average temperature of the workpiece in a temperature image. First, the industrial computer controls the drive motor to rotate the arc tube so that one of the tube openings of the arc tube faces or is close to the high-temperature area of ​​the workpiece. Then the industrial computer increases the ventilation volume of the electric control valve corresponding to the arc tube until the temperature difference between the high-temperature area and the average temperature of the workpiece is no more than 5 degrees Celsius.

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