Smooth aluminium tube heating device

Abstract

The utility model relates to the technical field of power cable manufacturing discloses a kind of smooth aluminium aluminium pipe heating devices, including support main body, support main body is fixedly connected with outer round ring, outer round ring and inner round ring are relatively rotated by ball to realize movement, the inner edge of inner round ring is equipped with gear ring, and is engaged with pinion, and at least two groups of split fixing frame are evenly provided at the both sides of inner round ring respectively.Compared with prior art, by installing drying gun on split fixing frame, the rotation of inner round ring can be driven by motor, so that the drying gun can be dynamically rotated around the smooth aluminium aluminium pipe to solve the problem of local overheating / underheating caused by heating at fixed position.In addition, the radial position of the four drying guns can be adjusted by the clamping groove on the split fixing frame to adapt to different pipe diameters of the smooth aluminium aluminium pipe, so that a single set of equipment can be compatible with multiple specifications of aluminium pipes without the need to replace tooling.

Description

Technical Field

[0001] This utility model relates to the field of power cable manufacturing technology, specifically to a heating device for smooth aluminum tubes. Background Technology

[0002] To address the issue of cable failures caused by discharge ablation between the wrinkled aluminum sheath and the semi-conductive buffer layer in high-voltage power cables in recent years, the industry has developed a smooth aluminum sheath cable structure. This structure uses a hot-melt adhesive coating process to bond the outer sheath and aluminum sheath into a continuous whole, eliminating interfacial air gaps to suppress partial discharge. For the outer sheath and aluminum sheath to bond seamlessly, the surface temperature of the aluminum tube must be ≥85℃ during hot-melt adhesive coating; otherwise, wrinkling of the aluminum sheath, bow-shaped deformation of the outer sheath, and debonding of the hot-melt adhesive interface will occur, leading to corrosion and seal failure. To achieve a surface temperature above 85℃, the smooth aluminum tube needs to be preheated.

[0003] Currently, Chinese utility model patent CN203366861U discloses a cable aluminum sheath preheating device, which preheats the aluminum sheathed cable passing through the center of the support by using hot-plastic air guns evenly arranged along a circular bracket. However, due to the fixed position of the hot-plastic air guns, the aluminum sheath directly facing the hot-plastic air guns receives more heat and experiences a faster temperature rise, while the areas not directly facing the hot-plastic air guns experience a slower temperature rise. This uneven heating of the aluminum sheath leads to the problem that the surface temperature of the aluminum tube does not meet the technical requirements after preheating. Consequently, after hot melt adhesive coating and cable winding, the inner sheath surface of the cable may exhibit arching or wrinkling. Summary of the Invention

[0004] The purpose of this invention is to provide a heating device for smooth aluminum tubes, which allows four sets of heating torches to dynamically rotate and heat the smooth aluminum tube by being fixed on a rotatable inner ring driven by a motor. This ensures that the heat from the torches covers the entire circumference of the tube, solving the problem of localized overheating / underheating caused by fixed-position heating. A further objective of this invention is to allow for radial position adjustment of the four sets of heating torches through slots on a split fixing frame, adapting to different diameters of smooth aluminum tubes. This achieves the effect of a single set of equipment being compatible with multiple specifications of aluminum tubes without the need to change tooling.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a smooth aluminum tube heating device, comprising a support body, an outer ring fixedly connected to the support body, the outer ring and the inner ring achieving relative rotational motion through a rolling ball, a toothed ring on the inner edge of the inner ring meshing with a pinion, and at least one split fixing frame evenly provided on both sides of the inner ring. The split fixing frame fixes the heating gun evenly distributed on the inner ring, and the rotation of the pinion drives the heating gun to dynamically rotate and heat the smooth aluminum tube as the inner ring rotates, so that the heat blown out by the heating gun covers the entire circumference of the tube, uniformly heating the smooth aluminum tube.

[0006] Preferably, the split mounting bracket is equipped with an annular bayonet for locking the drying gun. The position of the annular bayonet can be adjusted radially through the slot on the split mounting bracket. The adjustable annular bayonet design can accommodate different specifications of smooth aluminum tubes, enabling a single set of equipment to be compatible with multiple specifications of aluminum tubes without changing tooling. The annular bayonet can also be adjusted to accommodate different types of drying guns by adjusting the tightness of the bayonet.

[0007] Preferably, the drive motor is connected to a pinion via a drive rod, and drives the inner ring to reciprocate through a gear ring. The rotation angle range of the inner ring is 45° to 180°. The rotation range is determined based on the number of drying guns, ensuring that the heating range of the drying guns covers the entire 360° circumference of the aluminum tube. The reciprocating rotation structure reduces the machining range of the gear ring, saving production costs, and eliminates the need to consider the wiring tangling problem caused by the rotation of the drying guns. The drive motor is a servo motor, and the rotation speed and rotation angle range of the inner ring can be adjusted via a controller.

[0008] Preferably, the transmission ratio between the pinion and the gear ring is 1:4 to 1:8. Different specifications and materials of aluminum tubes have different requirements for heating speed and uniformity. An adjustable transmission ratio means that the reciprocating rotation speed of the inner ring can be flexibly adjusted, thereby adapting to the heating process parameters of different specifications of aluminum tubes or different power heating torches, ensuring heating quality.

[0009] Preferably, the inner edge of the outer ring has an outer ring raceway, and the outer edge of the inner ring has an inner ring raceway. Four pockets are evenly distributed on the outer ring raceway. The outer and inner ring raceways serve as the basis for the movement of the rolling ball, converting the sliding friction between the outer and inner rings into rolling friction. This significantly reduces friction during rotation, making the rotation of the inner ring 3 smoother and reducing vibration and noise during equipment operation. The pockets also limit the movement of the rolling ball, confining its movement within a specific area.

[0010] Preferably, the bottom of the pocket has a through hole, and the outer ring is fixedly connected to the support body by screws through the through hole. The through hole provides a connection fulcrum for fixing the outer ring to the support body. By passing screws through the through hole, the outer ring is firmly fixed to the support body, ensuring that the outer ring does not shift or wobble during device operation. This rigid connection is a prerequisite for maintaining the relative positional stability of the outer and inner rings, and directly affects the accuracy of the fit between the ball and the raceway.

[0011] Preferably, the rolling balls are housed within pockets and roll on the inner ring raceway. The pockets confine the rolling balls to a specific area, preventing them from shifting, moving erratically, or colliding with each other under centrifugal force or rotational impact. This ensures the rolling balls always roll within a preset trajectory, engaging with the inner ring raceway and providing fundamental support for the smooth rotation of the inner ring. Each pocket individually bears the pressure of its corresponding rolling ball, allowing multiple rolling balls to evenly distribute the weight of the inner ring and its associated components, preventing excessive wear of the raceway or rolling balls due to excessive localized stress.

[0012] Preferably, both the outer and inner raceways are Gothic arched grooves. The curved surface of the arched groove closely matches the surface of the rolling ball, providing precise guidance for the ball's rolling trajectory. The curved surface shape of the Gothic arched groove has high symmetry and regularity, making it easier to ensure dimensional accuracy and surface finish during machining. Simultaneously, this shape offers some tolerance for the dimensional tolerances of the rolling ball; even if there are minor dimensional deviations, they can be compensated for through the adaptive contact of the arched surface, reducing running jams caused by insufficient assembly precision and lowering the difficulty of machining and assembly.

[0013] Preferably, the separate fixing bracket and the inner ring are connected by high-strength screws. The anti-loosening performance can be enhanced by applying thread-locking adhesive between the screw and the screw hole. Compared to a one-piece casting process, screw connections do not require customized complex casting molds. The separate fixing bracket and the inner ring can be machined separately and then assembled using screws, reducing the manufacturing difficulty of individual products and lowering production costs. Furthermore, the separate fixing bracket can be easily disassembled and replaced individually without requiring the entire inner ring to be replaced.

[0014] Preferably, the annular bayonet is fixed to the slot by bolts, and an anti-loosening washer is provided between the bolt and the slot. The bolt connection method allows for quick assembly and disassembly of the annular bayonet. The anti-loosening washer generates continuous axial pressure through elastic deformation, which counteracts the tendency of the bolt to loosen under vibration and prevents the drying gun from shifting due to centrifugal force when it rotates at high speed with the inner ring.

[0015] After adopting the above technical solution, this utility model has the following beneficial effects:

[0016] The inner ring drives the heating gun to rotate back and forth, achieving all-round heating of the smooth aluminum tube. This solves the problem of uneven heating caused by the existing fixed heating method, greatly improves the heating quality, and ensures that the surface of the aluminum sleeve is heated evenly and the temperature reaches above 85℃.

[0017] The slot design of the split mounting bracket allows for radial adjustment of the annular bayonet and the heating gun, accommodating smooth aluminum tubes of different diameters. This eliminates the need to replace equipment, meeting diverse heating requirements and enhancing the versatility of the device.

[0018] With a reasonable transmission ratio of 1:4 to 1:8 between the pinion and the gear ring, the drive motor can drive the inner ring to rotate quickly and stably, thereby accelerating the heating speed, shortening the heating time, and meeting the needs of large-scale production.

[0019] Because the position adjustment of the drying gun and the start-up and shutdown of the device are simple, the labor intensity of the operators can be reduced; the detachable component connection method is conducive to maintenance, such as the easy disassembly of the outer ring and the individual replacement of the ring bayonet, reducing maintenance costs and time. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the smooth aluminum tube heating device;

[0021] Figure 2 A front view of the smooth aluminum tube heating device;

[0022] Figure 3 A top view of a smooth aluminum tube heating device;

[0023] Figure 4 A cross-sectional view of the rotating ring section of a smooth aluminum tube heating device;

[0024] Figure 5 This is a structural diagram of the split fixing frame for a smooth aluminum tube heating device.

[0025] In the diagram: 1. Main support frame; 11. Support base; 12. Mounting hole; 2. Outer ring; 21. Outer raceway; 22. Pocket; 23. Through hole; 3. Inner ring; 31. Gear ring; 32. Split fixing frame; 33. Inner raceway; 34. Annular bayonet; 35. Slot; 4. Ball bearing; 5. Pinion; 51. Drive rod. Detailed Implementation

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the smooth aluminum tube heating device includes a main support 1, an outer ring 2, an inner ring 3, a ball bearing 4, and a small gear 5. The main support 1 has two symmetrically distributed thin, large-area support bases 11 at its bottom. Each support base 11 has four evenly distributed mounting holes 12, which are then fixed to the ground with anchor bolts. Since the equipment requires precise rotational heating of the smooth aluminum tube, the stability of the base is crucial. The thin and large base design has several key advantages: First, it has strong anti-overturning ability because the large base area can disperse the periodic torque generated by the rotating equipment; second, because the thin plate structure itself has a damping effect, the material elasticity can absorb high-frequency vibrations, and the large contact area with the bottom surface reduces the ground pressure, avoiding resonance amplification and thus reducing vibration transmission; finally, due to the large base structure and the design of the four mounting holes, it is compatible with uneven ground, and with adjustable shims for compensation, it is easier to level, making installation more adaptable.

[0027] Due to the thinness of the base, and considering the rigidity requirements, a double-support structure combined with the pre-tightening force of the anchor bolts is used to ensure the rigidity of the installation structure. This base design, through a symmetrical thin plate and four-point anchoring structure, achieves an optimal balance between rigidity, thermal stability, and maintainability, making it particularly suitable for rotary heating equipment with stringent requirements for motion precision. The main body of the support frame 1 is made of high-strength steel, possessing sufficient structural strength and stability to withstand the weight of the entire device and the forces generated during operation, such as the centrifugal force when the inner ring rotates and the reaction force when the drying gun is working. This ensures that the entire device will not shake or tilt during operation, thus providing a stable platform for the subsequent installation of other components.

[0028] like Figure 2 and Figure 4 As shown, the outer ring 2 is cast from cast iron, possessing high wear resistance and strength to ensure that the heating device is not easily deformed or worn during long-term use, thus extending its service life. The inner edge of the outer ring 2 has an outer ring raceway 21, which is a Gothic arched groove. Its dimensional accuracy and surface roughness are strictly controlled to ensure a good fit with the rolling ball 4. The outer ring raceway 21 is one of the key structures for the relative rotational motion between the outer ring 2 and the inner ring 3. It cooperates with the inner ring raceway 33 of the inner ring 3 to provide a rolling trajectory for the rolling ball 4, ensuring stable rolling of the ball 4. It converts the sliding friction between the outer and inner rings into rolling friction, significantly reducing friction during rotation and making the rotation of the inner ring 3 smoother and more stable, reducing vibration and noise during equipment operation. The Gothic arched groove structure allows for good contact with the rolling ball, increasing the contact area, distributing the load, and reducing wear, which is an important guarantee for the long-term stable operation of the device.

[0029] Four pockets 22 are evenly machined on the outer raceway 21 to accommodate the rolling balls 4, serving to position the balls and prevent them from shifting or falling off during movement. The size of the pockets 22 matches the rolling balls 4, with a diameter slightly smaller than the balls 4, allowing part of the balls 4 to roll within the pockets 22 while leaving a certain gap between the balls 4 and the bottom of the pockets 22. This prevents the balls 4 from colliding with the fixing screws connecting the outer ring and the main support during rolling, thus avoiding jamming of the rolling structure and preventing wear on the steel balls. A through hole 23 is machined at the bottom of the pocket 22, with a diameter matching the fixing screw. During screw tightening, it is essential to ensure that the tightening force of each screw is uniform, ensuring that the outer ring 2 is securely installed without loosening. The outer ring 2 serves as the fixed track for the rotation of the inner ring 3; its stable installation is a prerequisite for the stable rotation of the inner ring 3. The connection between the outer ring 2 and the main support 1 via screws through the through holes 23 is reliable and easy to disassemble, facilitating future maintenance and replacement.

[0030] The inner ring 3 is made of high-strength aluminum alloy, which is lightweight and high-strength, effectively reducing the overall weight of the device while ensuring sufficient rigidity during rotation. The bottom inner edge of the inner ring 3 has a toothed ring 31 with a diameter of 1 / 2 of the inner ring's inner diameter, and the outer edge has an inner ring raceway 33 that matches the rolling balls 4 well. Four sets of separate fixing frames 32 are evenly distributed on both sides. The inner ring raceway 33 adopts a Gothic arched groove design, forming good contact with the rolling balls 4, increasing the contact area, effectively distributing the load, reducing friction and wear during rotation, making the rotation of the inner ring 3 smoother and more stable, reducing vibration and noise during equipment operation, and providing a stable motion foundation for the uniform heating of the aluminum tube by the drying gun.

[0031] The gear ring 31 on the inner edge of the inner ring 3 meshes with the pinion 5, and with a transmission ratio of 1:4 to 1:8, it can efficiently transmit the power of the drive motor, precisely control the reciprocating rotation speed and torque of the inner ring 3, meet the rotation speed requirements of different heating processes, and ensure the controllability and efficiency of the heating process. The high-strength and lightweight structure of the inner ring 3 can reduce the load on the drive motor, reduce energy consumption, and ensure that it will not deform when driving the drying gun to rotate, ensuring the precise movement trajectory of the drying gun. The good fit between the inner ring raceway 33 and the rolling ball 4 provides a guarantee for the smooth rotation of the inner ring 3. The high-strength material makes it less prone to deformation when driving the drying gun to rotate, ensuring that the movement trajectory of the drying gun is always precise, avoiding the positional deviation of the drying gun due to the deformation of the inner ring 3, and further ensuring the uniformity and consistency of heating of the aluminum tube.

[0032] The rolling ball 4, as the core structure for achieving smooth reciprocating rotation of the device, is made of high-precision bearing steel and undergoes precision machining and heat treatment, resulting in extremely high hardness, wear resistance, and roundness. The rolling ball 4 is housed within the four pockets 22 of the outer ring 2, ensuring that it can roll freely within the pockets 22 and on the inner ring raceway 33 without jamming. As the rolling element between the outer ring 2 and the inner ring 3, the rolling ball 4 transforms the sliding friction between them into rolling friction, greatly reducing the coefficient of friction and energy loss, making the rotation of the inner ring 3 more effortless and smoother. Simultaneously, its high-precision manufacturing ensures a good fit with the raceway, further improving the stability of rotation.

[0033] like Figure 4As shown, the pinion 5 is made of high-strength alloy steel, and its tooth surface has undergone carburizing and quenching treatment, giving it high hardness and wear resistance, enabling it to withstand the enormous friction and impact forces generated when meshing with the gear ring 31. The pinion 5 meshes with the gear ring 31 on the inner edge of the inner ring 3. By adjusting the position of the bearing housing, a reasonable meshing clearance is ensured for smooth transmission. Then, the drive motor is connected to the drive rod 51 via a coupling, and the other end of the drive rod 51 is fixedly connected to the pinion 5, ensuring a secure and loose connection. The high strength and wear resistance of the pinion 5 guarantee the reliability and durability of the transmission; the reasonable meshing clearance results in low noise and low impact during transmission, reducing wear on the tooth surface; the connection between the drive motor and the pinion 5 is simple and reliable, and the power transmission efficiency is high.

[0034] like Figure 5 As shown, the split mounting bracket 32 ​​and the inner ring 3 are fixedly connected by stainless steel hexagonal screws. The assembly process is simple, the connection is firm, no complex process equipment is required, and it can withstand the weight of the drying gun and the vibration during operation. The stainless steel hexagonal screw connection method allows users to set different numbers of drying guns according to their needs, facilitating the assembly and disassembly of the split mounting bracket 32. If the split mounting bracket 32 ​​wears, deforms, or is damaged due to long-term use, the screw connection can also be easily disassembled and replaced without replacing the entire inner ring 3, reducing maintenance costs and consumable consumption, which is especially suitable for production scenarios with high requirements for equipment maintenance efficiency. The annular bayonet 34 achieves radial position adjustment through the slot 35 on the split mounting bracket 32. The design of the slot 35 makes the adjustment process convenient. Operators can quickly adjust the radial position of the annular bayonet 34 and the drying gun according to the diameter of the aluminum tube, the heating area, and other requirements, ensuring that the distance between the drying gun and the aluminum tube is always within the optimal heating range, solving the problem that traditional fixed connection methods cannot adapt to multiple specifications of workpieces.

[0035] The annular bayonet 34 and the separate fixing frame 32 are fixed together by bolts or other locking structures. During device operation, especially during the high-speed reciprocating rotation of the inner ring, it effectively resists the centrifugal force, vibration, and thermal deformation generated by the drying gun, preventing the drying gun from loosening or shifting. This stability ensures the consistency of the drying gun's movement trajectory, which is the foundation for achieving uniform heating of the aluminum tube. This connection method is not only suitable for heating aluminum tubes of different diameters but also compatible with various specifications of drying guns. By simply replacing the appropriate annular bayonet 34, drying guns of different power and shapes can be installed without modifying the separate fixing frame 32, greatly improving the device's adaptability to diverse processing needs and reducing equipment replacement costs. The wrap-around locking design of the annular bayonet 34, combined with the limiting function of the slot 35, prevents the drying gun from accidentally falling off under high-temperature operating conditions, reducing safety hazards during equipment operation and ensuring the safety of operators and the surrounding environment.

[0036] The assembly process of this smooth aluminum tube heating device is as follows:

[0037] First, the outer ring 2 is fixedly connected to the bracket body 1 with screws. The screws pass through the through hole 23 at the bottom of the pocket 22 of the outer ring 2 and are tightened to ensure the stable installation of the outer ring 2.

[0038] Next, place the ball 4 into the pocket 22 of the outer ring raceway 21 on the inner edge of the outer ring 2, ensuring that the ball 4 can roll freely within the pocket 2. Then, install the inner ring 3 into the outer ring 2, so that the inner ring raceway 33 of the inner ring 3 contacts the ball 4, and adjust the position of the inner ring 3 to ensure that the inner ring 3 can rotate flexibly within the outer ring 2.

[0039] Next, install the pinion 5 and the drive motor, meshing the pinion 5 with the gear ring 31 of the inner ring 3. Adjust the position of the pinion 5 to ensure good meshing without any jamming. The drive motor is fixed to the main body 1 of the bracket via a motor bracket, and the connection between the drive rod 51, the pinion 5, and the drive motor must be firm and reliable.

[0040] Finally, according to the required number of drying guns, the split fixing brackets 33 are evenly installed on the inner ring 3, and the annular bayonet 34 is installed on the slot 35 of the split fixing bracket 33. The position of the annular bayonet 34 is adjusted as needed, and the drying gun is installed into the annular bayonet 34. The annular bayonet 34 is then locked to complete the assembly of the entire device.

[0041] Taking the heating of a smooth aluminum tube with a diameter of 50mm as an example, the working process of the device is explained.

[0042] The working process of this smooth aluminum tube heating device is as follows:

[0043] First, the operator releases the cable with the smooth aluminum tube from the cable release rack and then uses a front traction machine to pull it through the heating device. The support position of the smooth aluminum tube is adjusted so that it is located at the central axis of the inner ring 3 of the heating device, ensuring that the heating gun can fully cover the area of ​​the aluminum tube that needs to be heated.

[0044] Then, according to the diameter of the aluminum tube to be heated, loosen the locking bolt of the annular bayonet 34, adjust the annular bayonet 34 to a suitable radial position along the slot 35 of the split fixing frame 33, so that the nozzle of the heating gun can be aligned with the outer surface of the smooth aluminum tube. After adjustment, tighten the locking bolt to fix the annular bayonet 34.

[0045] Next, start the drive motor and set its rotation parameters so that the inner ring 3 reciprocates at a certain speed, with the rotation angle set to ±90°. The drive motor operates, driving the pinion 5 to reciprocate via the drive rod 51. The pinion 5 meshes with the gear ring 31 on the inner edge of the inner ring 3, thereby causing the inner ring 3 to reciprocate within the outer ring 2 via the rolling balls 4. The rotation speed is set according to the heating requirements, and the transmission ratio between the pinion and the gear ring is selected as 1:6.

[0046] During the reciprocating rotation of the inner ring 3, the split fixing frames 33 on both sides and the heating gun on the annular bayonet 34 move together. The heat generated by the heating gun is evenly applied to the surface of the smooth aluminum tube, achieving comprehensive and uniform heating of the smooth aluminum tube. During the heating process, due to the reciprocating rotation of the inner ring, the heating gun can evenly heat all parts of the aluminum tube, avoiding local overheating / underheating. Since the reciprocating rotation angle and speed of the inner ring 3 can be controlled by the drive motor, the heating process can be precisely adjusted according to the actual heating requirements to ensure that the aluminum tube achieves the ideal heating effect. The rolling ball 4 rolls in the pocket 22 and on the inner ring raceway 33, ensuring the smoothness and stability of the relative rotation between the outer ring 2 and the inner ring 3, and reducing energy loss during the movement. The outer ring raceway 21 and the inner ring raceway 33 adopt a Gothic arched groove design, which further enhances the fit performance between the rolling ball 4 and the raceway, and improves the load-bearing capacity and operational reliability of the device.

[0047] If it is necessary to heat smooth aluminum tubes of different diameters, simply loosen the locking bolt of the annular bayonet 34 and adjust the position of the annular bayonet 34 on the slot 35 to adapt to the new smooth aluminum tube specifications. The operation is simple and convenient.

Claims

1. A smooth aluminium aluminium tube heating device characterised in that: It includes a support body (1), and an outer ring (2) is fixedly connected to the support body (1). The outer ring (2) and the inner ring (3) achieve relative rotational movement through a ball (4). The inner ring (3) has a toothed ring (31) on its inner edge, which meshes with the pinion (5); At least two separate fixing frames (32) are evenly provided on both sides of the inner ring (3).

2. The smooth aluminum-aluminum tube heating device according to claim 1, characterized in that: The split mounting bracket (32) is equipped with an annular slot (34) for locking the drying gun. The position of the annular slot (34) can be adjusted radially by the slot (35) on the split mounting bracket (32).

3. The smooth aluminum tube heating device according to claim 1, characterized in that: The drive motor is connected to the pinion (5) via the drive rod (51), and drives the inner ring (3) to reciprocate through the gear ring (31). The rotation angle of the inner ring (3) is from 45° to 180°.

4. The smooth aluminum tube heating device according to claim 1 or 3, characterized in that: The transmission ratio between the pinion (5) and the gear ring (31) is 1:4 to 1:

8.

5. The smooth aluminum tube heating device according to claim 1, characterized in that: The outer ring (2) has an outer ring raceway (21) on its inner edge, and the inner ring (3) has an inner ring raceway (33) on its outer edge. The outer ring raceway (21) has four pockets (22) evenly spaced at 90° intervals.

6. The smooth aluminum tube heating device according to claim 5, characterized in that: The bottom of the pocket (22) is provided with a through hole (23), and the outer ring (2) is fixedly connected to the bracket body (1) by screws through the through hole (23).

7. The smooth aluminum tube heating device according to claim 5, characterized in that: The ball (4) is housed in the pocket (22) and rolls on the inner raceway (33).

8. The smooth aluminum tube heating device according to claim 5, characterized in that: Both the outer raceway (21) and the inner raceway (33) are Gothic arched grooves.

9. The smooth aluminum tube heating device according to claim 1 or 2, characterized in that: The split fixing frame (32) is connected to the inner ring (3) by high-strength screws.

10. The smooth aluminum tube heating device according to claim 2, characterized in that: The annular bayonet (34) is fixed to the slot (35) by bolts, and an anti-loosening washer is provided between the bolts and the slot (35).

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