Electric heating equipment for metal pipe fitting, inflatable thermal forming production line and method

Abstract

The invention discloses metal pipe fitting electric heating equipment which comprises a long-strip-shaped base and two sets of electrode assemblies, one electrode assembly is fixed, and the other electrode assembly can slide along a main sliding rail of the base. The electrode assembly has X / Y-direction moving and rotating adjusting capacity, a clamping air cylinder of the electrode assembly can drive two electrode chucks to clamp a pipe fitting, and each electrode chuck is of a modular structure with a fixed polar plate and a replaceable contact polar plate. The equipment is further provided with a non-contact temperature sensor, a reset air cylinder and other components, can adapt to pipe fittings of different specifications, achieves accurate and uniform heating, can automatically adjust the position along with thermal expansion and cold contraction of the pipe fittings, avoids deformation of the pipe fittings, improves the universality and heating stability of the equipment, and reduces the production cost. The invention further discloses a production line comprising the heating equipment and a metal pipe fitting air expansion thermal forming machining method.

Description

Technical Field

[0001] This invention relates to the field of heating metal pipe fittings, specifically to an electric heating device for metal pipe fittings, an air expansion thermoforming production line, and an air expansion thermoforming method. Background Technology

[0002] Air expansion thermoforming is a metal thermoforming process. Before air expansion thermoforming of metal pipes, the pipes need to be heated. Traditional heating methods, such as integral furnace heating, often suffer from low heating efficiency and high energy consumption. Furthermore, for pipes with complex shapes, it is difficult to control the direction and amount of deformation after heating, thus affecting subsequent precise material feeding and forming accuracy. In addition, some dedicated heating devices designed for specific pipe shapes have poor versatility. When the pipe specifications or shape change, significant adjustments or even redesign and remanufacturing of the heating device are required, increasing production costs and time, and failing to meet the needs of modern manufacturing for small-batch, multi-variety pipe production. Therefore, developing a heating device that can adapt to metal pipes of different specifications and shapes, achieve rapid, uniform, and precise heating, and possess a high degree of automation and energy efficiency has become an urgent technical problem to be solved in this field. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to heat metal pipe fittings uniformly.

[0004] The specific technical solution of the present invention to solve the above-mentioned technical problems is as follows: An electric heating device for metal pipe fittings includes a long strip base and an electrode assembly; The metal pipe fitting refers to a metal component that is open at both ends and has a hollow closed cross section, and whose length is in a large proportion to the perimeter of the cross section. Its cross section includes, but is not limited to, circles, ellipses, triangles, squares, rectangles, regular polygons, and other arbitrary closed shapes.

[0005] An electrode assembly is fixedly provided at one end of the base, and an electrode assembly is slidably provided at the other end of the base; at least one electrode assembly is provided on the Y-axis slider, the Y-axis slider is slidably provided on the Y-axis slide rail, the Y-axis slider is connected to a reset cylinder, and the two chambers of the reset cylinder are connected to the atmosphere during the heating stage. The electrode assembly includes a rotary disk, a first vertical plate, a horizontal support plate, a horizontal guide rail, a clamping cylinder, a clamping pull block, and an electrode chuck; The first upright plate is mounted on the rotating disk, and the system also includes a second upright plate. The second upright plate is mounted on the first upright plate via a vertical fine-tuning structure. The horizontal support plate is fixedly mounted on the upper end of the second upright plate, and the horizontal guide rail is fixedly mounted on the horizontal support plate. There are two electrode clamps, which are slidably mounted on the horizontal guide rail. The clamping cylinder is fixedly mounted on the second upright plate, and the output end of the clamping cylinder is provided with a clamping pull block. The two electrode clamps are respectively connected to the clamping pull block via hinge rods. The clamping cylinder is used to control the relative or opposite movement of the two electrode clamps to clamp the tube to be heated. The vertical fine-tuning structure can take various forms, such as a linear motor, adjusting nut, or hydraulic cylinder, as long as it enables the second vertical plate to be adjusted relative to the first vertical plate in the vertical direction.

[0006] The electrode clamp is electrically connected to an external power source.

[0007] This solution offers the following advantages over existing technologies: Given that the two electrode assemblies can rotate and be adjusted in the forward and backward directions, this equipment can adapt to clamping tubes of different cross-sections, shapes, and lengths, exhibiting a high degree of flexibility. Furthermore, after heating the metal tube, due to the principle of thermal expansion and contraction, the tube will significantly elongate in the length direction, solving the technical problem of unquantifiable deformation control during tube heating and fixing. This provides technical controllability for the precise feeding and stable positioning of the hot tube blank on the mold. The electrode assemblies are designed to move along the Y-axis (i.e., forward and backward), automatically adjusting their position according to the thermal expansion and contraction of the metal tube, preventing resistance in the length direction and thus avoiding deformation of the metal tube during processing.

[0008] By incorporating a reset cylinder, the Y-axis slider can be driven to quickly return to its initial position after heating, preparing for the next clamping of the pipe fitting and improving the continuous operation efficiency of the equipment. During the heating phase, both chambers of the reset cylinder are connected to the atmosphere, allowing the Y-axis slider to float freely. In this phase, the Y-axis slider does not exert any additional resistance to the autonomous movement of the electrode assembly in the Y direction. When the metal pipe fitting changes position due to thermal expansion, the electrode assembly can smoothly move the Y-axis slider with the pipe fitting, ensuring that the electrode clamp maintains good contact with the pipe fitting at all times. This guarantees the continuous and stable operation of the electric heating process and avoids problems such as pipe fitting deformation or poor contact that might result from the rigid connection of the reset cylinder hindering the thermal expansion displacement of the pipe fitting. This further improves the equipment's adaptability to pipe fitting thermal deformation and the reliability of the heating process.

[0009] Furthermore, it also includes a Z-axis slide rail fixedly mounted on the second vertical plate, and the clamping block slidably mounted on the Z-axis slide rail.

[0010] The advantage of adopting the above-mentioned further solution is that by setting a Z-axis slide rail and allowing the clamping block to slide along it, the vertical position of the clamping block can be limited, ensuring the accuracy of the movement.

[0011] Furthermore, the horizontal support plate is provided with an insulating support block for supporting the pipe to be processed before the electrode chuck clamps it.

[0012] The beneficial effect of adopting the above-mentioned further solution is that by setting up an insulating support block, the pipe to be processed can be stably supported before the electrode chuck clamps it, preventing the pipe from shifting due to its own weight or unstable placement, thus ensuring the accuracy of the subsequent clamping position of the electrode chuck; at the same time, the insulating properties of the insulating support block can effectively prevent energy loss or interference to other parts of the equipment caused by current conduction through the support block, ensuring the safety and stability of the electric heating process and improving the overall working reliability of the equipment.

[0013] Furthermore, the electrode chuck includes a fixed electrode plate and a contact electrode plate. The fixed electrode plate is provided with a positioning structure, and the contact electrode plate is adapted to the positioning structure. The contact electrode plate is provided with a clamping part adapted to the outer contour of the pipe to be processed.

[0014] The beneficial effects of adopting the above-mentioned further solution are that by designing the electrode chuck as a combination of a fixed electrode plate and a contact electrode plate, and utilizing a positioning structure to achieve precise adaptation between the two, when the specifications or shape of the pipe to be processed changes, only the contact electrode plate with the corresponding outer contour adaptation clamping part needs to be replaced, without adjusting the entire electrode chuck or other structures of the equipment. Furthermore, the part directly in contact with the pipe may also suffer from burning damage during daily use; in this case, only the contact electrode plate needs to be replaced, without replacing the entire device, thus reducing electrode costs. This modular design greatly improves the equipment's adaptability to different pipes, reduces the time and cost of tooling changes, enhances the equipment's versatility, and can quickly respond to the production needs of small batches and multiple varieties of pipes. At the same time, the adaptable positioning structure ensures the positional accuracy of the contact electrode plate after installation, guaranteeing good contact between the electrode chuck and the pipe, thereby ensuring stable current conduction, achieving uniform heating, and contributing to improved product heating quality and consistency.

[0015] Furthermore, the first positioning structure is a groove, the contact electrode plate is provided with a pressing part, and also includes a clamping plate. The clamping plate abuts against the pressing part to fix the contact electrode plate, and the clamping plate itself is fixed to the fixed electrode plate by bolts.

[0016] The beneficial effect of adopting the above-mentioned further solution is that by setting the first positioning structure as a groove and correspondingly setting a pressing part on the contact plate, combined with the fixing method of the clamping plate and bolts, the contact plate can be quickly and stably installed and removed from the fixed plate. The groove structure can accurately limit the lateral position of the contact plate, preventing it from shifting horizontally during clamping of pipe fittings or current conduction; and after the clamping plate is tightened by bolts, it can tightly press the pressing part against the fixed plate, effectively eliminating the gap between the contact plate and the fixed plate, ensuring good conductivity between the two, and avoiding problems such as excessive local resistance and uneven heating caused by poor contact. When it is necessary to replace the contact plate, simply loosen the bolts and remove the clamping plate to easily replace the contact plate of different specifications. The whole process is simple and efficient, further shortening the tooling change time and improving the production efficiency and ease of operation of the equipment.

[0017] Furthermore, it also includes an X-axis slide rail and an X-axis slider, with the X-axis slider sliding on the X-axis slide rail; the rotary disk or the Y-axis slide rail is disposed on the X-axis slider. By adopting the above further solution, and by adding an X-axis slide rail and an X-axis slider, and placing the rotary disk or Y-axis slide rail on the X-axis slider, the electrode assembly can be adjusted in position along the X-axis (i.e., left-right direction). This design further expands the adjustment dimensions of the equipment. When the length of the metal pipe or the lateral distance between the clamping points at both ends changes, the position of the X-axis slider can be adjusted to ensure that the electrode clamp is precisely aligned with the clamping area at the end of the pipe, thereby better adapting to pipes of different lengths. The combination of X-axis adjustment, Y-axis adjustment, and rotational adjustment forms a more flexible three-dimensional adjustment system. This allows the equipment to ensure optimal contact and clamping between the electrode clamp and the end of the pipe when dealing with pipes with complex shapes and varied spatial orientations through multi-directional position and angle adjustments. This further enhances the equipment's versatility and adaptability to various pipes, laying a more solid structural foundation for achieving precise and uniform heating. This solution can further improve the equipment's ability to clamp and heat pipes of different shapes, resulting in greater flexibility.

[0018] Furthermore, a non-contact temperature sensor is also fixedly installed to measure the temperature of the metal pipe fittings.

[0019] The beneficial effect of adopting the above-mentioned further solution is that by setting up a non-contact temperature sensor, the surface temperature of the metal pipe fitting can be monitored in real time and accurately during the heating process without direct contact with the high-temperature pipe fitting. Real-time temperature feedback provides crucial data support for intelligent control of the heating process. When the pipe fitting temperature reaches the preset process requirements, the external power supply can be stopped in a timely manner, or the heating power can be dynamically adjusted according to temperature changes, ensuring that the pipe fitting heating temperature is accurately controlled within the target range. This effectively avoids localized overheating or underheating, thereby ensuring the smooth progress of subsequent gas expansion thermoforming processes and the stability of product quality. Furthermore, the non-contact temperature sensor's position moves with the X-axis slider, adapting to pipe fittings of different lengths and clamping positions, ensuring continuous temperature monitoring of the key heating areas of the pipe fitting during the heating process, thus improving the automation level and temperature control accuracy of the equipment.

[0020] Furthermore, the base is provided with a main slide rail, and the main slide rail is provided with a main slider. The X-axis slide rail of the electrode assembly slidably disposed on the base is disposed on the main slider, and the main slider is controlled by a screw to move on the main slide rail.

[0021] The beneficial effect of adopting the above-mentioned further solution is that by setting the main slide rail and the main slider on the base, and installing the X-axis slide rail of the sliding end electrode assembly on the main slider, and using a screw to control the movement of the main slider on the main slide rail, the initial distance between the two electrode assemblies can be adjusted conveniently and accurately. For metal pipes of different lengths, the operator can drive the main slider to slide along the main slide rail by rotating the screw, thereby quickly adjusting the position of the sliding end electrode assembly, so that the two electrode assemblies can effectively clamp the pipe to be heated according to its length, greatly improving the equipment's adaptability to pipes of different lengths. The screw drive has the characteristics of high transmission accuracy and good self-locking performance, which can ensure that the main slider is stably maintained in the set position after adjustment, avoiding the displacement of the electrode assembly position due to external force or vibration during clamping and heating, ensuring the accuracy and stability of the contact between the electrode clamp and the end of the pipe, and providing a reliable guarantee for the smooth operation of the subsequent electric heating process. At the same time, this structural design makes the adjustment operation of the equipment simple and intuitive, reduces the workload of the operator, and improves the ease of operation and production preparation efficiency of the equipment.

[0022] A metal pipe gas expansion thermoforming production line includes the aforementioned electric heating equipment for the metal pipe.

[0023] Furthermore, it also includes a robotic arm, a pipe storage rack, a pre-positioning platform, and an air-expansion thermoforming machine. The pipe storage rack is used to store metal pipes to be processed. The robotic arm is used to grasp and move the metal pipes to be processed and place them on the pre-positioning platform. The pre-positioning platform is used to pre-position the pipes to be processed, so that the robotic arm can grasp the metal pipes to be processed more accurately and place them on the electric heating device of the metal pipes. The electric heating device of the metal pipes is used to heat the metal pipes. The robotic arm is also used to transfer the heated metal pipes into the air-expansion thermoforming machine, which is used to complete the air-expansion thermoforming of the metal pipes.

[0024] By combining the structural design features of multi-cavity molds, multiple tube blanks with different spacings can be heated simultaneously, reducing the number of subsequent thermoforming tooling and thus reducing product costs.

[0025] The present invention also discloses a method for gas expansion thermoforming of metal pipe fittings, which uses the aforementioned gas expansion thermoforming heating equipment for heating metal pipe fittings. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the layout of the metal pipe fitting gas expansion thermoforming production line of the present invention; Figure 2 This is a schematic diagram showing the details of the prepositioning stage in this invention; Figure 3 This is a schematic diagram of the electric heating device for the metal pipe fittings of the present invention; Figure 4 This is a partial schematic diagram of the electric heating device for the metal pipe fittings of the present invention; Figure 5 This is a schematic diagram showing the position of the electrode clamp in the electric heating device for the metal pipe fitting of the present invention.

[0027] The following is a list of component names represented by the reference numerals in the attached diagram: 1. Base; 2. Electrode assembly; 3. X-axis slide rail; 4. X-axis slider; 5. Y-axis slide rail; 6. Y-axis slider; 7. Rotary disk; 8. First upright plate; 9. Horizontal support plate; 10. Horizontal guide rail; 11. Clamping cylinder; 12. Clamping pull block; 13. Electrode chuck; 14. External power supply; 15. Flexible cable; 16. Fixed electrode plate; 17. Contact electrode plate; 18. Pressing plate; 19. Crimping part; 20. Non-contact type Temperature sensor; 21. Reset cylinder; 22. Main slide rail; 23. Main slider; 24. Z-axis slide rail; 25. Lifting block; 26. Second vertical plate; 27. Vertical fine-tuning bolt; 100. Pipe storage rack; 200. Robotic arm; 300. Pre-positioning stage; 301. Radial pre-positioning guide plate; 302. Axial pre-positioning guide plate; 303. Pad; 400. Electric heating assembly for metal pipe fittings; 500. Metal pipe fittings. Detailed Implementation

[0028] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0029] A metal pipe gas expansion thermoforming production line includes a pipe temporary storage rack 100, a robotic arm 200, a pre-positioning platform 300, a gas expansion thermoforming machine, and an electric heating assembly 400 for metal pipes. The electric heating assembly for metal pipes includes three parallel electric heating devices for metal pipes.

[0030] The pipe storage rack 100 is used to store metal pipes to be processed. The robotic arm 200 is used to simultaneously grasp three metal pipes to be processed and place them on the prepositioning stage 300. The prepositioning stage 300 is used to preposition the pipes to be processed, so that the robotic arm can grasp the metal pipes to be processed more accurately and place them on the electric heating components of the metal pipes. The electric heating components 400 of the metal pipes include three parallel electric heating devices for heating three metal pipes at the same time. The robotic arm 200 is also used to transfer the three heated metal pipes to the air expansion thermoforming machine at the same time. The air expansion thermoforming machine has three corresponding workstations, which can complete the air expansion thermoforming of three metal pipes at the same time.

[0031] The prepositioning stage 300 is equipped with a radial prepositioning guide plate 301, an axial prepositioning guide plate 302, and a pad 303. The pad 303 prevents the bent part of the metal pipe from contacting the surface of the prepositioning stage 300, which would cause the posture to tilt, thus facilitating accurate positioning and gripping. The radial prepositioning guide plate 301 and the axial prepositioning guide plate 302 can achieve accurate positioning by combining the weight of the pipe itself. In this way, when the robot grips again, the pipe can accurately match the position of the workstation in the subsequent process.

[0032] The electric heating device for the aforementioned metal pipe fittings includes a long strip base 1 and an electrode assembly 2. The electrode assembly 2 is fixedly installed at one end of the base 1, and a sliding electrode assembly 2 is disposed at the other end.

[0033] Electrode assembly 2 includes X-axis slide rail 3, X-axis slider 4, Y-axis slide rail 5, Y-axis slider 6, rotary disk 7, first vertical plate 8, horizontal support plate 9, horizontal guide rail 10, clamping cylinder 11, clamping pull block 12, electrode chuck 13, second vertical plate 26, and vertical fine adjustment bolt 27.

[0034] X-axis slider 4 can slide on X-axis slide rail 3, and Y-axis slider 6 can slide on Y-axis slide rail 5.

[0035] The Y-axis slide rail 5 is mounted on the X-axis slider 4. The rotary disk 7 is rotatably mounted on the Y-axis slider 6. The first vertical plate 8 is fixed on the rotary disk 7. The second vertical plate 26 is mounted on the first vertical plate 8 via a guide structure and a vertical fine-tuning bolt 27. By adjusting the fine-tuning bolt 27, the position of the second vertical plate 26 relative to the first vertical plate 8 in the vertical direction can be adjusted. The horizontal support plate 9 is located at the top of the second vertical plate 26. An insulating lifting block 25 is provided on the horizontal support plate 9. The horizontal guide rail 10 is fixed on the horizontal support plate 9. The two electrode clamps 13 are slidably mounted on the horizontal guide rail 10 respectively. The clamping cylinder 11 is fixed on the second vertical plate 26, and its output end is connected to the clamping pull block 12. It also includes a Z-axis slide rail 24, which is fixed on the second vertical plate 26. The clamping pull block 12 is slidably arranged on the Z-axis slide rail 24. Two electrode clamps 13 are connected to the clamping pull block 12 through a hinge rod. The clamping cylinder 11 controls the two electrode clamps 13 to move relative to or towards each other on the horizontal guide rail 10 to clamp or release the metal pipe.

[0036] The electrode clamp 13 is electrically connected to the external power supply 14 via a flexible cable 15.

[0037] The electrode chuck 13 includes a fixed electrode plate 16 and a contact electrode plate 17, and also includes a clamping plate 18. The fixed electrode plate 16 has a positioning structure—a groove. The contact electrode plate 17 is adapted to the positioning structure and has a clamping part that matches the outer contour of the pipe to be processed. The contact electrode plate 17 has a pressing part 19, and the clamping plate 18 abuts against the pressing part 19 to fix the contact electrode plate 17. The clamping plate 18 is fixed to the fixed electrode plate 16 by bolts.

[0038] A non-contact temperature sensor 20 is also fixedly installed on the X-axis slider 4 for measuring the temperature of the metal pipe.

[0039] The Y-axis slider 6 is connected to the reset cylinder 21. Both chambers of the reset cylinder 21 are connected to the atmosphere during the heating stage so that they can move in accordance with the thermal expansion and contraction of the pipe.

[0040] The base 1 is provided with a main slide rail 22, and a main slider 23 is installed on the main slide rail 22. The X-axis slide rail 3 of the electrode assembly 2, which is slidably set on the base 1, is fixed on the main slider 23. The main slider 23 moves on the main slide rail 22 by means of a screw.

[0041] In practical applications, the operator first adjusts the initial distance between the two electrode assemblies 2 by rotating the screw to drive the main slider 23 along the main slide rail 22, based on the length of the metal tube to be heated. Next, the tube is placed on the insulating support blocks of the two electrode assemblies 2. The insulating support blocks provide initial stabilizing support for the tube, preventing it from shifting. Then, the clamping cylinder 11 is activated. The output end of the clamping cylinder 11 lifts upward, pushing the clamping pull block 12 upward along the Z-axis slide rail. The clamping pull block 12 drives the two electrode clamps 13 to move towards each other on the horizontal guide rail 10 via a hinge rod, clamping both ends of the tube using the clamping parts on the contact plate 17 that are adapted to the outer contour of the tube. If the two ends of the tube are not on the same straight line or have an angular deviation, the position of the X-axis slider 4 on the X-axis slide rail 3, the position of the Y-axis slider 6 on the Y-axis slide rail 5, and the rotating disk 7 can be adjusted to ensure that the two electrode clamps 13 accurately contact and firmly clamp the ends of the tube. After the external power supply 14 is turned on, the current is conducted to the pipe through the electrode clamp 13 to electrically heat the pipe. During the heating process, the non-contact temperature sensor 20 monitors the surface temperature of the pipe in real time and feeds the data back to the control system so that the heating power can be dynamically adjusted or heating can be stopped when the preset temperature is reached. At the same time, since both chambers of the reset cylinder 21 are connected to the atmosphere during the heating stage, the Y-axis slider 6 is in a free-floating state. When the pipe changes length or undergoes slight displacement due to thermal expansion and contraction, the electrode assembly 2 can drive the Y-axis slider 6, X-axis slider 4 and other related components to move freely, ensuring that the electrode clamp 13 always maintains good contact with the pipe and avoids applying additional stress to the pipe, which could lead to deformation. After heating is completed, the control system controls the clamping cylinder 11 to reverse its movement, releasing the pipe. The robot arm removes the heated pipe, and the reset cylinder 21 drives the Y-axis slider 6 back to its initial position, completing one work cycle.

[0042] When it is necessary to replace pipe fittings of different specifications or shapes, or when the contact electrode is damaged and needs to be replaced, simply loosen the bolts on the clamping plate 18, remove the old contact electrode 17, replace it with a new contact electrode 17 with the corresponding clamping part, and then fix it with the clamping plate 18 and bolts. The operation is convenient and efficient.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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. An electric heating device for metal pipe fittings, characterized in that, Includes a long, narrow base and electrode components; An electrode assembly is fixedly provided at one end of the base, and another electrode assembly is slidably provided at the other end of the base; At least one electrode assembly is disposed on a Y-axis slider, the Y-axis slider is slidably disposed on a Y-axis slide rail, the Y-axis slider is connected to a reset cylinder, and the two chambers of the reset cylinder are both connected to the atmosphere during the heating stage; The electrode assembly includes a rotary disk, a first vertical plate, a horizontal support plate, a horizontal guide rail, a clamping cylinder, a clamping pull block, and an electrode chuck; The first upright plate is mounted on the rotating disk, and the system also includes a second upright plate. The second upright plate is mounted on the first upright plate via a vertical fine-tuning structure. The horizontal support plate is fixedly mounted on the upper end of the second upright plate, and the horizontal guide rail is fixedly mounted on the horizontal support plate. There are two electrode clamps, which are slidably mounted on the horizontal guide rail. The clamping cylinder is fixedly mounted on the second upright plate, and the output end of the clamping cylinder is provided with a clamping pull block. The two electrode clamps are respectively connected to the clamping pull block via hinge rods. The clamping cylinder is used to control the relative or opposite movement of the two electrode clamps to clamp the tube to be heated. The electrode clamp is electrically connected to an external power source.

2. The electric heating device for metal pipe fittings according to claim 1, characterized in that, It also includes a Z-axis slide rail fixedly mounted on the second vertical plate, and the clamping block slidably mounted on the Z-axis slide rail.

3. The electric heating device for metal pipe fittings according to claim 2, characterized in that, The horizontal support plate is equipped with lifting blocks.

4. The electric heating device for metal pipe fittings according to any one of claims 1-3, characterized in that, The electrode chuck includes a fixed electrode plate and a contact electrode plate. The fixed electrode plate is provided with a positioning structure, and the contact electrode plate is adapted to the positioning structure. The contact electrode plate is provided with a clamping part adapted to the outer contour of the pipe to be processed.

5. The electric heating device for metal pipe fittings according to claim 4, characterized in that, The first positioning structure is a groove, the contact electrode plate is provided with a pressing part, and also includes a clamping plate. The clamping plate abuts against the pressing part to fix the contact electrode plate, and the clamping plate itself is fixed to the fixed electrode plate by bolts.

6. The electric heating device for metal pipe fittings according to any one of claims 1-3, characterized in that, The base is provided with a main slide rail, and the main slide rail is provided with a main slider. The electrode assembly slidably mounted on the base is mounted on the main slider, and the main slider is controlled by a screw to move on the main slide rail.

7. The electric heating device for metal pipe fittings according to any one of claims 1-3, characterized in that, It also includes an X-axis slide rail and an X-axis slider, wherein the X-axis slider slides on the X-axis slide rail; the rotary disk or the Y-axis slide rail is disposed on the X-axis slider.

8. A metal pipe fitting gas expansion thermoforming production line, characterized in that, Electric heating equipment including metal pipe fittings as described in any one of claims 1-7.

9. A metal pipe fitting gas expansion thermoforming production line according to claim 8, characterized in that, It also includes a robotic arm, a pipe storage rack, a pre-positioning platform, and an air-expansion thermoforming machine. The pipe storage rack is used to store metal pipes to be processed. The robotic arm is used to grasp and move the metal pipes to be processed and place them on the pre-positioning platform. The pre-positioning platform is used to pre-position the pipes to be processed, so that the robotic arm can grasp the metal pipes to be processed more accurately and place them on the electric heating device of the metal pipes. The electric heating device of the metal pipes is used to heat the metal pipes. The robotic arm is also used to transfer the heated metal pipes into the air-expansion thermoforming machine, which is used to complete the air-expansion thermoforming of the metal pipes.

10. A method for gas expansion thermoforming of metal pipe fittings, characterized in that, Heating is performed using the electric heating equipment for gas expansion thermoforming of metal pipe fittings as described in any one of claims 1-7.

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