Device and method for oxyacetylene flame annealing of red copper tube

Abstract

The invention provides a red copper tube oxyacetylene flame annealing device and method. The device comprises a flexible platform, a spray gun bracket, an oxyacetylene spray gun, a material rack, a flame reflecting cover and a temperature acquisition system, the flame reflecting cover is opposite to the oxyacetylene spray gun; the arc shape of an arc plate of the flame reflecting cover is matched with the curvature of the red copper pipe, protruding side plates on the two sides of the arc plate form a semi-enclosed heat collecting cavity, and the flame reflecting cover reflects oxyacetylene spray gun flame scattered towards the red copper pipe and high-temperature smoke heat back to the bottom of the red copper pipe and the arc cavity of the arc plate. The temperature acquisition system comprises a temperature acquisition device, a fixed seat and a temperature display; the temperature acquisition device is fixed on the fixed seat in a cantilever manner, a temperature measurement probe is arranged at the front end of the temperature acquisition device, penetrates into an inner cavity of the copper tube from the end part of the copper tube, and is aligned with the inner wall surface of a red temperature area formed by heating the outer wall of the copper tube by flame of the oxyacetylene spray gun; and the temperature display is used for displaying the temperature of each temperature measuring probe in real time.

Description

Technical Field

[0001] This invention relates to the field of annealing of copper tubes, and in particular to an oxyacetylene flame annealing apparatus and method for copper tubes. Background Technology

[0002] Copper pipes are widely used in marine piping systems due to their excellent thermal conductivity, electrical conductivity, high ductility, flexibility, corrosion resistance, ease of bending, and convenient cutting plasticity. In marine piping construction, copper pipes often require bending at large angles. Bending them directly without annealing will lead to defects such as wrinkling, collapse, thinning, and severe cracking of the pipe wall. Therefore, annealing is necessary for the bent sections of copper pipes in practical use. The actual annealing temperature range for copper pipes is quite wide, with a common difference of 150℃ between the upper and lower limits. While medium-frequency induction heating copper pipe annealing equipment can precisely control the temperature in practical use, it suffers from high equipment purchase and maintenance costs, the need to replace heating coils for different pipe diameters, relatively slow heating with electric heating, and inflexible operation. For a long straight pipe, only a few bent sections need annealing, and the use of medium-frequency induction heating copper pipe annealing equipment requires frequent adjustments to equipment parameters. This results in low overall efficiency, high cost, and inflexible use of medium-frequency induction heating copper pipe annealing equipment in practical applications, leading to relatively low equipment adoption and utilization rates.

[0003] Oxyacetylene flame annealing, a traditional and efficient on-site heat treatment method, is widely used for annealing copper tubes. However, this process has long suffered from a core technical challenge: the temperature of the heating zone during annealing cannot be effectively and in real-time monitored and controlled, even though actual process documents and operational requirements generally specify a clear range for the annealing temperature. This is mainly due to: 1. Strong interference from open flame: The oxyacetylene flame itself is a high-temperature, high-brightness, and strong radiation source, producing a large amount of infrared and visible light. This causes non-contact infrared thermometers to be severely interfered with by the background radiation of the flame when aiming at the heating point, resulting in readings that are much higher than the actual workpiece temperature, or even complete failure.

[0004] 2. Inaccurate and delayed temperature measurement of the outer wall of copper tubes: If contact temperature measurement is used to measure the temperature of the outer wall of the tube, firstly, there is a risk that the temperature measuring element will be directly burned by the flame. Secondly, during dynamic heating, there is a temperature gradient between the outer wall temperature and the inner wall temperature, which determines the recrystallization process, resulting in a delayed measurement value that cannot accurately reflect the thermal state of the material.

[0005] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems: Currently, the industry generally relies on the experience of operators for control: The "fire color observation" method involves roughly estimating the temperature by observing changes in the color of the copper tube surface in the heating zone. This method is greatly affected by ambient light, observation angle, and individual experience, and its accuracy cannot be guaranteed. It is also prone to insufficient annealing due to excessively low temperatures, or excessively high temperatures leading to coarse grains, overheating, or even melt collapse.

[0006] The "fire-off temperature measurement" method involves quickly measuring the temperature of the heated area with a temperature measuring device after heating has stopped. This is a static, post-hoc measurement that cannot reflect the true temperature changes during the dynamic heating process and is meaningless for ensuring temperature uniformity throughout the annealing process.

[0007] The aforementioned crude temperature control methods directly led to problems such as unstable product quality, difficulty in improving yield, and serious energy waste.

[0008] Therefore, developing a device and method that can monitor the actual temperature of the oxyacetylene annealing process of copper tubes in real time and accurately, and thereby achieve precise process control, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] To overcome the shortcomings of existing technologies and address the problem of inaccurate real-time measurement of annealing temperature in copper tubes during actual annealing processes, this application provides a copper tube oxy-acetylene flame annealing apparatus and method. The copper tube oxy-acetylene flame annealing method utilizes a copper tube oxy-acetylene annealing apparatus. A temperature acquisition device inserts a temperature probe deep into the heating zone of the inner wall of the copper tube to measure the inner wall temperature, performing direct internal temperature measurement within the tube. This direct temperature measurement within the copper tube enables precise control of the annealing process, ensuring product quality uniformity and stability, and avoiding energy waste due to overheating. A flame reflector plate effectively recovers heat, and the flame reflector improves thermal energy utilization, achieving energy saving and emission reduction, thus solving the technical problems of copper tube oxy-acetylene flame annealing.

[0010] The solution adopted by the embodiments of this application to solve the technical problem is: A copper tube oxyacetylene flame annealing device includes a flexible platform, a spray gun support, an oxyacetylene spray gun, a material rack, a flame reflector, and a temperature acquisition system. The flexible platform is used as a working platform for flame annealing of copper tubes; The oxyacetylene spray gun is positioned at the front end of the flexible platform. The spray gun bracket is located at the front end of the flexible platform, with a V-shaped opening at the top to support the oxyacetylene spray gun. The operator can control the heating position of the flame of the oxyacetylene spray gun on the copper tube. The material rack is fixed on a flexible platform, and rollers are arrayed on the material rack to carry the copper tubes and drive them to perform axial feeding movements. Annealing operations are carried out through manual feeding mode and automatic feeding mode. A lifting mechanism is provided at the bottom of the material rack to adjust the height of the material rack to accommodate copper tubes of different specifications. The flame reflector is located on the rear side of the material rack, opposite to the oxyacetylene torch. The flame reflector includes a base plate, an arc plate, and side plates. A base plate is located at the bottom of the flame reflector, and the arc plate is supported on the base plate. Side plates are located on both sides of the arc plate. The arc plate is located on the back side of the copper tube, and its arc shape matches the curvature of the copper tube. The protruding side plates on both sides of the arc plate form a semi-enclosed heat collection cavity. The flame reflector effectively reflects the heat of the oxyacetylene torch flame and high-temperature flue gas scattered towards the copper tube back to the bottom of the copper tube and the arc-shaped cavity of the arc plate. The temperature acquisition system includes a temperature acquisition device, a mounting base, and a temperature display. The mounting base is located on the side of the flexible platform. The temperature acquisition device is cantilevered and fixed to the mounting base. A temperature probe is installed at the front end of the temperature acquisition device. The temperature probe can penetrate into the inner cavity of the copper tube from the end and be aimed at the inner wall surface of the "red temperature zone" formed by the oxyacetylene torch flame heating the outer wall of the copper tube. The temperature display is located at the rear end of the flexible platform and is used to display the temperature of each temperature probe in real time. It is also equipped with data recording and over-limit alarm functions.

[0011] In a preferred embodiment, the inner surface of the arc-shaped cavity of the arc plate is coated with a high-temperature aluminum foil emission layer.

[0012] In a preferred embodiment, the temperature acquisition device is a multi-channel infrared thermometer or a thermocouple.

[0013] In a preferred embodiment, the flexible platform is provided with casters at the bottom and a standard mounting hole array on the platform surface.

[0014] In a preferred embodiment, the bottom of the V-shaped opening of the spray gun holder is provided with an anti-slip rubber pad.

[0015] In a preferred embodiment, the rollers of the feed rack are provided with recessed V-grooves or U-grooves.

[0016] In a preferred embodiment, the axial feeding of the copper tube has a manual mode and an automatic mode. In the manual mode, the operator pushes the copper tube axially. In the automatic mode, a power mechanism on the material rack drives the rollers to rotate in linkage.

[0017] In a preferred embodiment, the base plate of the flame reflector is mounted on a flexible platform via a hinge and placed next to the material rack. The hinge allows for angle adjustment from 0° to 45°.

[0018] In a preferred embodiment, multiple temperature probes are evenly arranged circumferentially at the front end of the temperature acquisition device to obtain the temperature at each point in the entire annular heating zone of the copper tube.

[0019] To further address the technical problems to be solved in the embodiments of this application, the embodiments of this application provide an oxyacetylene flame annealing process for a copper tube, which includes the following steps: Align the temperature probe at the front end of the temperature acquisition device with the oxyacetylene torch so that the red temperature zone of the copper tube is collected during the heating process of the copper tube by the oxyacetylene torch flame; insert the copper tube into the temperature acquisition device before ignition to avoid damage to the temperature probe by the high temperature flame; during the annealing process, observe the temperature display and adjust the feed speed of the copper tube for annealing; including manual feed mode and automatic feed mode. Furthermore, the manual feed mode is used for annealing several discontinuous areas of the copper tube, allowing manual control of the axial feed of the copper tube. The copper tube is placed on the rollers of the material rack. Relying on the concave structure of the rollers, the copper tube automatically and stably stays on the center line. The height of the material rack is adjusted so that the temperature probe of the temperature acquisition device is located in the center of the copper tube. The arc plate of the flame reflector is adjusted to a suitable tilt angle. The material rack is set to manual mode. The operator stands next to the flexible platform to observe the temperature display, adjusts the oxyacetylene torch flame, manually controls the copper tube and adjusts the copper tube feed speed. When the oxyacetylene torch flame reaches the annealing area of ​​the copper tube, it stops moving forward. When the temperature of the oxyacetylene torch flame reaches the process standard, it continues to move forward. The entire annealing process depends on the operator, who controls it according to the real-time temperature feedback from the temperature display.

[0020] Furthermore, automatic feed mode: used for continuous annealing of copper tubes, with automatic continuous feeding; Place the copper tube on the rollers of the material rack. Relying on the concave structure of the rollers, the copper tube automatically and stably centers. Adjust the height of the material rack so that the temperature probe of the temperature acquisition device is located in the center of the copper tube. Adjust the arc plate of the flame reflector to a suitable tilt angle. Set the material rack to automatic mode. The operator stands next to the flexible platform to observe the temperature display and adjusts the oxyacetylene torch flame. Adjust the rotation speed of the rollers of the material rack according to the pre-tested process parameters and adjust the feed speed of the copper tube. Throughout the annealing process, the temperature display needs to be observed in real time, and the size of the oxyacetylene torch flame and the feed speed of the copper tube need to be adjusted appropriately to ensure that the copper tube is fully annealed at this speed. Throughout the annealing process, the operator only needs to adjust the relevant parameters at the beginning and then observe.

[0021] Positive effects: Compared with the prior art, the beneficial effects of this embodiment are significant and multifaceted: 1. Breakthrough and accuracy of temperature measurement technology: The temperature acquisition device inserts a temperature probe deep into the heating zone of the inner wall of the copper tube to measure the temperature of the inner wall of the copper tube. The built-in temperature measurement of the inner wall of the tube avoids the problem of not being able to measure the temperature of the copper tube in the heating zone while annealing due to the interference of open flame in the traditional method. It completely solves the industry problem of open flame interference and realizes the real-time and accurate acquisition of the core temperature parameters of the annealing process, providing a reliable data foundation for the quantitative control of the process.

[0022] 2. Energy efficiency optimization and saving: The annealing process is precisely controlled to avoid overheating and energy waste. The flame reflector effectively recovers some of the lost heat energy and improves the effective utilization rate of heat. Actual measurements show that compared with traditional methods, it can save more than 50% of gas consumption.

[0023] 3. Significant improvement in product quality: Based on accurate temperature feedback, operators can precisely control the flame annealing process, ensuring that the annealing temperature of the entire copper tube is always within the optimal range required by the process, thereby improving the uniformity and stability of the material structure and properties after annealing, and greatly reducing the scrap rate caused by over-burning or under-burning.

[0024] 4. Stable and flexible feeding modes: The concave design of the material rack ensures the stability and alignment of the copper tube transmission, fundamentally avoiding uneven heating caused by copper tube jumping or offset. Meanwhile, the availability of both manual and automatic feeding modes allows the device to meet the flexible processing and process exploration needs of small-batch, multi-specification products, as well as the continuous production of large batches at a stable pace, making it suitable for a wide range of applications.

[0025] 5. Scientific and standardized operation: The original "craft" that relied on personal experience has been transformed into a standardized process that is quantifiable, replicable, and trainable. This reduces reliance on the individual experience of operators and helps ensure consistency in product quality across large-scale production or different work groups.

[0026] It is suitable for use as a copper tube oxyacetylene flame annealing apparatus and method. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is the southeast isometric view of this embodiment; Figure 2 This is the isometric drawing of the southwest region in this embodiment; Figure 3 This is the front view of this embodiment; Figure 4 This is a top view of this embodiment; Figure 5 This is the left view of this embodiment; Figure 6 This is an isometric view of section AA in this embodiment; Figure 7 This is an isometric view of section BB in this embodiment; Figure 8 This is a schematic diagram of the temperature acquisition device. Figure 9 This is a schematic diagram of a flame reflector structure.

[0029] In the figure, 1. Flexible platform, 2. Spray gun bracket, 3. Oxyacetylene spray gun, 4. Material rack, 5. Copper pipe, 6. Flame reflector, 61. Seat plate, 62. Arc plate, 63. Side plate, 7. Temperature acquisition device, 71. Temperature probe, 8. Fixing base, 9. Temperature display. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] According to the instruction manual Figure 1-9 As shown, a copper tube oxyacetylene flame annealing device includes a flexible platform 1, a spray gun support 2, an oxyacetylene spray gun 3, a material rack 4, a flame reflector 6, and a temperature acquisition system. The flexible platform 1 is a frame structure and is used as a working platform for flame annealing of copper tube 5. As the installation base of the device, it is usually welded from steel profiles and equipped with casters at the bottom for easy movement and positioning, adapting to different work sites. The platform surface is provided with a standard array of mounting holes for fixing various components. Oxyacetylene torch 3 is set at the front end of flexible platform 1 and is used for flame annealing of copper tube 5; The spray gun bracket 2 is a block structure and is set at the front end of the flexible platform 1. The top of the spray gun bracket 2 has a V-shaped opening to support the oxyacetylene spray gun 3. The operator can adjust the pitch angle to control the heating position of the flame of the oxyacetylene spray gun 3 on the copper tube 5. The bottom of the V-shaped opening has an anti-slip rubber pad, which not only ensures the stability of the oxyacetylene spray gun 3, but also facilitates the fine adjustment of the angle of the oxyacetylene spray gun 3. The material rack 4 is fixed to the flexible platform 1. Rollers are arranged on the material rack 4 to support the copper tube 5 and drive it to perform axial feeding motion to carry out the annealing operation. The rollers are provided with concave V-shaped grooves or U-shaped grooves, which can restrict the cylindrical copper tube 5 to the center position of the groove bottom to ensure the stability of the copper tube 5 during the feeding process. The axial feeding of the copper tube 5 has a manual mode and an automatic mode. In the manual mode, the operator pushes the copper tube 5 to move axially. In the automatic mode, the material rack 4 is equipped with a power mechanism to drive the rollers to rotate in linkage. The power mechanism adopts conventional technology and will not be described in detail. A lifting mechanism is provided at the bottom of the material rack 4 to adjust the height of the material rack 4 to adapt to copper tubes 5 of different specifications. The lifting mechanism adopts conventional technology and will not be described in detail. The flame reflector 6 is located on the rear side of the material rack 4, opposite to the oxyacetylene spray gun 3, and is used to reflect the flame and heat lost from the oxyacetylene spray gun 3; the flame reflector 6 includes a base plate 61, an arc plate 62 and a side plate 63. A base plate 61 is provided at the lower part of the flame reflector 6, and an arc plate 62 is supported on the base plate 61. Side plates 63 are provided on both sides of the arc plate 62. The base plate 61 is mounted on the flexible platform 1 by a hinge and is placed next to the material rack 4. The hinge can achieve an angle adjustment of 0°-45° to optimize the reflection effect for different specifications of copper tubes 5 and heating intensity. The arc plate 62 is located on the back side of the copper tube 5, and its arc shape is adapted to the curvature of the copper tube 5. The protruding side plates 63 on both sides of the arc plate 62 form a semi-enclosed shape. The heat collection chamber; the flame of the oxyacetylene torch 3 exhibits a jetting phenomenon. The outer wall of the copper tube 5 is circular, and a large amount of the flame of the oxyacetylene torch 3 will directly pass over the outer surface of the copper tube 5 and be lost. The flame reflector 6 effectively reflects the heat of the oxyacetylene torch 3 flame and high-temperature flue gas scattered towards the copper tube 5 back to the bottom of the copper tube 5 and the arc-shaped cavity of the arc plate 62, making secondary use of the lost flame and heat, further "supplementing" and "reshaping" the thermal field, and reducing the loss of heat from the oxyacetylene torch 3 flame to the environment. The temperature acquisition system includes a temperature acquisition device 7, a mounting base 8, and a temperature display 9; The fixed base 8 is a block structure and is set at the side end of the flexible platform 1; The temperature acquisition device 7 is fixed to the mounting base 8 in a cantilever manner. A temperature probe 71 is provided at the front end of the temperature acquisition device 7. The temperature probe 71 can penetrate into the inner cavity of the copper tube 5 from the end and be aimed at the inner wall surface of the "red temperature zone" formed by the flame of the oxyacetylene torch 3 heating the outer wall of the copper tube 5. This built-in direct temperature measurement of the inner wall of the tube avoids the direct interference of the external open flame. Multiple temperature probes 71 are evenly arranged circumferentially at the front end of the temperature acquisition device 7, which can obtain the temperature of each point in the annular heating zone of the entire copper tube 5. In this embodiment, there are no fewer than four temperature probes 71; Temperature display 9 is located at the rear of flexible platform 1 to display the temperature of each temperature probe 71 in real time, and is equipped with data logging and over-limit alarm functions.

[0032] Preferably, the inner surface of the arc-shaped cavity of the arc plate 62 is coated with a high-temperature aluminum foil emission layer for emission heat insulation.

[0033] Preferably, the temperature acquisition device 7 is a multi-channel infrared thermometer or a thermocouple.

[0034] The working process of this embodiment: Includes the following steps: Align the temperature probe 71 at the front end of the temperature acquisition device 7 with the oxyacetylene torch 3 so that the red temperature zone of the copper tube 5 is collected during the process of the flame of the oxyacetylene torch 3 heating the copper tube 5; insert the copper tube 5 into the temperature acquisition device 7 before ignition to avoid damage to the temperature probe 71 by the high temperature flame; during the annealing process, observe the temperature display 9 and adjust the feed speed of the copper tube 5 for annealing; including manual feed mode and automatic feed mode. Manual feed mode: used for annealing several discontinuous areas of copper tube 5, allowing manual control of the axial feed of copper tube 5; The copper tube 5 is placed on the rollers of the material rack 4. Relying on the concave structure of the rollers, the copper tube 5 automatically and stably stays on the center line. The height of the material rack 4 is adjusted so that the temperature probe 71 of the temperature acquisition device 7 is located in the center of the copper tube 5. The arc plate 62 of the flame reflector 6 is adjusted to a suitable tilt angle. The material rack 4 is set to manual mode. The operator stands next to the flexible platform 1 to observe the temperature display 9, adjusts the flame of the oxyacetylene torch 3, manually controls the copper tube 5 and adjusts the feed speed of the copper tube 5. When the flame of the oxyacetylene torch 3 reaches the annealing area of ​​the copper tube 5, it stops moving forward. When the temperature of the flame of the oxyacetylene torch 3 reaches the process standard, it continues to move forward. The entire annealing process depends on the operator and is controlled according to the real-time temperature feedback from the temperature display 9.

[0035] Automatic feed mode: Used for continuous annealing of copper tubes, with automatic continuous feed; Place the copper tube 5 on the rollers of the material rack 4. Relying on the concave structure of the rollers, the copper tube 5 automatically and stably stays on the center line. Adjust the height of the material rack 4 so that the temperature probe 71 of the temperature acquisition device 7 is located in the center of the copper tube 5. Adjust the arc plate 62 of the flame reflector 6 to a suitable tilt angle. Set the material rack 4 to automatic mode. The operator stands next to the flexible platform 1 to observe the temperature display 9, adjust the flame of the oxyacetylene torch 3, adjust the rotation speed of the rollers of the material rack 4 according to the pre-tested process parameters, and adjust the feed speed of the copper tube 5. Throughout the annealing process, the temperature display 9 needs to be observed in real time, and the flame size of the oxyacetylene torch 3 and the feed speed of the copper tube 5 need to be adjusted appropriately to ensure that the copper tube 5 is fully annealed at this speed. Throughout the annealing process, the operator only needs to adjust the relevant parameters at the beginning and then observe.

[0036] In this embodiment, when the diameter of the copper tube 5 is less than φ60, there is no need to rotate the copper tube 5, as the flame of the oxyacetylene torch 3 can cover the entire copper tube 5. Only axial feeding of the copper tube 5 is required for annealing. When the diameter of the copper tube 5 is greater than φ60, the copper tube 5 needs to be flipped or rotated for annealing. The annealing temperature range is 500℃~700℃, the axial feed speed range of the copper tube 5 is 50-200mm / min, and the rotation speed range of the copper tube 5 is 5-30rpm.

[0037] Features of this embodiment: The copper tube oxyacetylene flame annealing device described in this embodiment has a reasonable structure, is easy to operate, and has significant effects. It can effectively solve the current problem of temperature monitoring and control in the copper tube oxyacetylene flame annealing process, while improving energy utilization efficiency. The device has a low manufacturing threshold and controllable cost, and most factories and enterprises can complete the manufacturing themselves. It is equipped with a material rack with rollers, and the temperature probe is suspended and installed at the front end of a bracket. After the whole assembly is fixed, it can meet the basic usage requirements. It is very easy to modify and promote on existing production lines, and has good industrial practicality and broad market application prospects.

[0038] It is worth noting that all content not described in detail in the specification belongs to existing technology known to those skilled in the art, and the model parameters of the oxyacetylene spray gun 3, temperature acquisition device 7, temperature probe 71, and temperature display 9 are not specifically limited and can be determined using conventional equipment. Electrical control components not mentioned in this technical solution are not shown in the figures because they belong to existing technology, and will not be described further here. The description of this invention is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0039] Finally, it should be noted that: The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A copper tube oxyacetylene flame annealing apparatus, characterized in that: It includes a flexible platform (1), a spray gun bracket (2), an oxyacetylene spray gun (3), a material rack (4), a flame reflector (6), and a temperature acquisition system; The flexible platform (1) is used as a working platform for flame annealing of copper tubes (5); The oxyacetylene spray gun (3) is located at the front end of the flexible platform (1); The spray gun bracket (2) is set at the front end of the flexible platform (1), and the top is provided with a V-shaped opening for supporting the oxyacetylene spray gun (3). The operator can control the heating position of the flame of the oxyacetylene spray gun (3) on the copper tube (5). The material rack (4) is fixed on the flexible platform (1). Rollers are arranged on the material rack (4) to carry the copper tube (5) and drive it to perform axial feeding. The annealing operation is carried out through manual feeding mode and automatic feeding mode. A lifting mechanism is provided at the bottom of the material rack (4) to adjust the height of the material rack (4) to adapt to copper tubes (5) of different specifications. The flame reflector (6) is located on the rear side of the material rack (4) and opposite to the oxyacetylene spray gun (3); the flame reflector (6) includes a base plate (61), an arc plate (62) and a side plate (63). The flame reflector (6) is provided with a base plate (61) at the bottom, and an arc plate (62) is supported on the base plate (61). Side plates (63) are provided on both sides of the arc plate (62). The arc plate (62) is located on the back side of the copper tube (5), and its arc shape is adapted to the curvature of the copper tube (5). The side plates (63) protruding on both sides of the arc plate (62) form a semi-enclosed heat collection cavity. The flame reflector (6) effectively reflects the heat of the oxyacetylene torch (3) flame and high-temperature flue gas scattered towards the copper tube (5) back to the bottom of the copper tube (5) and the arc-shaped cavity of the arc plate (62). The temperature acquisition system includes a temperature acquisition device (7), a mounting base (8), and a temperature display (9); The fixed base (8) is disposed on the side end of the flexible platform (1); The temperature acquisition device (7) is fixed on the fixed base (8) in a cantilever manner. A temperature probe (71) is provided at the front end of the temperature acquisition device (7). The temperature probe (71) can penetrate into the inner cavity of the copper tube (5) from the end and be aimed at the inner wall surface of the "red temperature zone" formed by the flame of the oxyacetylene torch (3) heating the outer wall of the copper tube (5). The temperature display (9) is located at the rear end of the flexible platform (1) and is used to display the temperature of each temperature probe (71) in real time. It is also equipped with data recording and over-limit alarm functions.

2. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: The inner surface of the arc-shaped cavity of the arc plate (62) is coated with a high-temperature aluminum foil emission layer.

3. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: The temperature acquisition device (7) is a multi-channel infrared thermometer or a thermocouple.

4. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: The flexible platform (1) is equipped with casters at the bottom and a standard mounting hole array on the surface of the platform.

5. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: The bottom of the V-shaped opening of the spray gun bracket (2) is provided with an anti-slip rubber pad.

6. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: The rollers of the material rack (4) are provided with concave V-shaped grooves or U-shaped grooves.

7. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: The axial feeding of the copper tube (5) has a manual mode and an automatic mode. In the manual mode, the operator pushes the copper tube (5) to move axially. In the automatic mode, the material rack (4) is equipped with a power mechanism to drive the rollers to rotate in linkage.

8. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: The base plate (61) of the flame reflector (6) is mounted on the flexible platform (1) by a hinge and placed next to the material rack (4). The hinge can achieve an angle adjustment of 0°-45°.

9. The copper tube oxyacetylene flame annealing apparatus according to claim 1, characterized in that: Multiple temperature probes (71) in the temperature acquisition device (7) are evenly arranged circumferentially at the front end of the temperature acquisition device (7) to obtain the temperature of each point in the annular heating zone of the entire copper tube (5).

10. A method for annealing a copper tube with an oxyacetylene flame, using the copper tube oxyacetylene flame annealing apparatus as described in any one of claims 1-9, characterized in that: Includes the following steps: Align the temperature probe (71) at the front end of the temperature acquisition device (7) with the oxyacetylene torch (3) so that the process of the oxyacetylene torch (3) heating the copper tube (5) with flame is to collect the red temperature zone of the copper tube (5); insert the copper tube (5) into the temperature acquisition device (7) and then ignite it to avoid the high temperature flame from damaging the temperature probe (71); during the annealing process, observe the temperature display (9) and adjust the feed speed of the copper tube (5) for annealing. Includes manual feed mode and automatic feed mode; Among them, the manual feed mode is used for annealing several discontinuous areas of the copper tube (5) and manually controlling the axial feed of the copper tube (5); Place the copper tube (5) on the roller of the material rack (4). Relying on the concave structure of the roller, the copper tube (5) automatically and stably stays in the center line. Adjust the height of the material rack (4) so ​​that the temperature probe (71) of the temperature acquisition device (7) is located in the center of the copper tube (5). Adjust the arc plate (62) of the flame reflector (6) to a suitable tilt angle. Set the material rack (4) to manual mode. The operator stands next to the flexible platform (1) to observe the temperature display (9), adjust the flame of the oxyacetylene spray gun (3), manually control the copper tube (5) and adjust the feed speed of the copper tube (5). When the flame of the oxyacetylene spray gun (3) reaches the annealing area of ​​the copper tube (5), stop moving forward. When the flame temperature of the oxyacetylene spray gun (3) reaches the process standard, continue to move forward. The entire annealing process depends on the operator and is controlled according to the real-time temperature feedback of the temperature display (9). Among them, automatic feed mode: used for continuous annealing of copper tubes (5), automatic continuous feed; Place the copper tube (5) on the roller of the material rack (4). Relying on the concave structure of the roller, the copper tube (5) automatically and stably stays on the center line. Adjust the height of the material rack (4) so ​​that the temperature probe (71) of the temperature acquisition device (7) is located in the center of the copper tube (5). Adjust the arc plate (62) of the flame reflector (6) to a suitable tilt angle. Set the material rack (4) to automatic mode. The operator stands next to the flexible platform (1) to observe the temperature display (9), adjust the flame of the oxyacetylene torch (3), adjust the rotation speed of the roller of the material rack (4) according to the pre-tested process parameters, and adjust the feed speed of the copper tube (5). During the entire annealing process, the temperature display (9) needs to be observed in real time and the flame size of the oxyacetylene torch (3) and the feed speed of the copper tube (5) need to be adjusted appropriately to ensure that the copper tube (5) is fully annealed at this speed. During the entire annealing process, the operator only needs to adjust the relevant parameters at the beginning and then observe.

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