Inner support type hanger insertion strip for aluminum pipe anodic oxidation treatment

Abstract

The utility model relates to a hanging tool, in particular to an inner supporting type hanging tool insertion strip for aluminum pipe anodic oxidation treatment. Comprising an inserting strip body, and three inner supporting assemblies are arranged on the side wall of the inserting strip body in the axis direction of the inserting strip body in an array mode. The three inner supporting assemblies are arranged on the inserting strip body in the axis direction of the inserting strip body in an array mode, a worker lifts a conical aluminum pipe upwards through the inserting strip body and the inner supporting assembly located in the middle, and after the inner supporting assemblies on the two sides correspond to the large end and the small end of the conical aluminum pipe respectively, the conical aluminum pipe can be inserted into the inserting strip body. A worker sequentially stretches hands into the small end opening and the large end opening of the conical aluminum pipe to operate the corresponding inner supporting assemblies, the inner supporting assemblies on the two sides conduct inner supporting and fixing on the conical aluminum pipe, and then the three inner supporting assemblies conduct inner supporting and fixing on the positions, close to the large end, the middle and the small end, of the inner wall of the conical aluminum pipe correspondingly. And the stability of the conical aluminum pipe fixed outside the insertion strip body is ensured.

Description

Technical Field

[0001] This utility model relates to a hanging fixture, specifically, to an internal support type hanging fixture insert for anodizing aluminum tubes. Background Technology

[0002] Anodizing is a surface treatment process that generates a dense oxide film on a metal surface through electrochemical methods. It is especially widely used in aluminum and aluminum alloy materials. Its core principle is to place the aluminum material as the anode in an electrolyte and oxidize the aluminum surface to form a protective aluminum oxide layer through the action of an external current. This gives aluminum profiles multiple advantages such as corrosion resistance, wear resistance, aesthetics, and environmental friendliness. It is a surface treatment solution that takes into account both functionality and economy.

[0003] Aluminum tubes include tapered aluminum tubes, which are aluminum tubes with one end having a larger diameter than the other end. They are widely used in aerospace, automobile manufacturing, and building decoration. In the current technology, when anodizing such tapered aluminum tubes, a hanger insert is required to internally support and fix the tapered aluminum tube in order to prevent the tapered aluminum tube from vibrating or shaking during the anodizing process, thereby reducing the quality of the anodizing.

[0004] The utility model with authorization announcement number CN214937883U provides an aluminum profile anodizing fixture insert. It inserts two insert shells into the aluminum alloy profile from the left and right sides. The motor drives the rotating shaft to rotate, thereby driving the threaded column to rotate, which in turn drives the threaded tube to move, thereby driving the first support rod to rotate and pushing the second hinge seat closer to the inner wall of the aluminum alloy profile. This causes the support plate and support pad to move, so that the surface of the support pad touches the inner wall of the aluminum alloy profile, thus firmly fixing the aluminum alloy profile.

[0005] However, when the hanger insert in the aforementioned patent provides internal support for the tapered aluminum tube, the contact points between the two support pads and the inner wall of the tapered aluminum tube are on the same plane. Internal support within the same plane typically only constrains radial displacement of the tapered aluminum tube, but its constraint on axial displacement is weak. When the hanger insert shakes during the hoisting process of the tapered aluminum tube, the degree of freedom outside the support plane of the tapered aluminum tube is not effectively restricted, easily causing relative movement between the tapered aluminum tube and the hanger insert. If the tapered aluminum tube shakes after anodizing, it is prone to contact with the electrolytic cell. Friction will occur at the contact points between the tapered aluminum tube and the electrolytic cell, forming black or white spots, affecting the aesthetics and corrosion resistance of the tapered aluminum tube surface. Furthermore, the friction between the tapered aluminum tube and the electrolytic cell will damage the oxide film on the surface of the tapered aluminum tube, reducing the quality of the anodizing process. Utility Model Content

[0006] The purpose of this invention is to provide an internal support type hanger insert for anodizing aluminum tubes, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides an internal support type hanger insert for anodizing aluminum tubes, comprising an insert body. Three internal support components are arrayed along the axial direction of the insert body on its side wall. Each internal support component includes an assembly box. The middle assembly box is fixedly positioned in the middle of the side wall of the insert body. The two assembly boxes on either side are slidably fitted onto the insert body. An adjustment mechanism is provided on the insert body to equidistantly adjust the distance between the two assembly boxes on either side and the middle assembly box. Three moving blocks are slidably arranged in a circular array inside the assembly box. Three through slots are circularly arranged on the side of the assembly box away from the insert body. The ends of the three moving blocks away from the insert body pass through the three through slots and extend outwards. A displacement mechanism is provided on the lower side of the assembly box to drive the three moving blocks to move synchronously towards or away from the insert body.

[0008] As a further improvement to this technical solution, the displacement mechanism includes a ring gear coaxially rotatably disposed on the lower side wall of the assembly box. A positioning frame is coaxially fixedly disposed on the lower side wall of the ring gear. A worm gear and a worm meshing with the worm gear are disposed between the positioning frame and the assembly box. The worm gear is coaxially fixed on the upper side wall of the positioning frame, and the worm is rotatably disposed on the lower side wall of the assembly box.

[0009] As a further improvement to this technical solution, a rack is fixed on one side of the moving block at a position outside the assembly box. The rack extends from one end outside the assembly box toward the insert body. The displacement mechanism also includes three transmission gears arranged in a ring array on the side wall of the assembly box. The transmission gears are arranged outside the ring gear and mesh with the three racks respectively. An external gear is coaxially fixed on the lower side of the transmission gears and meshes with the ring gear.

[0010] As a further improvement to this technical solution, both ends of the insert body are threaded with caps, and both ends of the insert body are provided with three movable slots in a circular array. The adjustment mechanism includes a threaded rod coaxially disposed inside the insert body, and the two ends of the threaded rod are rotatably connected to the two caps respectively.

[0011] As a further improvement to this technical solution, the adjusting mechanism also includes positive thread grooves and negative thread grooves respectively opened on the threaded rod near both ends. Nuts are threadedly connected to both the positive thread grooves and negative thread grooves. Three connecting rods are fixed in a ring array on the side wall of the nut. The positions of the six connecting rods correspond to the positions of the six movable grooves respectively. The other end of the connecting rod passes through the corresponding movable groove and is fixed with a mounting block. The six mounting blocks are respectively fixedly installed on two assembly boxes located on both sides.

[0012] As a further improvement to this technical solution, a hook is coaxially fixed to the upper side wall of the upper cap, and the lower end of the threaded rod rotatably passes through the lower side wall of the lower cap and is coaxially fixed to a knob.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The aluminum tube anodizing treatment uses an internal support type hanger insert. Three internal support components are arrayed along the axis of the insert body. The worker lifts the tapered aluminum tube upwards using the insert body and the internal support component in the middle. After aligning the internal support components on both sides with the large and small ends of the tapered aluminum tube respectively, the worker inserts their hands into the small and large end openings of the tapered aluminum tube to operate the corresponding internal support components. This internally supports and fixes the tapered aluminum tube, allowing the three internal support components to internally support and fix the inner wall of the tapered aluminum tube near the large end, near the middle, and near the small end respectively. This ensures the stability of the tapered aluminum tube fixed outside the insert body and prevents the tapered aluminum tube from contacting the electrolytic cell due to shaking after anodizing, which could damage the oxide film on the surface of the tapered aluminum tube.

[0015] 2. The anodizing treatment of aluminum tubes uses an internal support type hanger. After the middle internal support component aligns with the middle position of the inner wall of the tapered aluminum tube, the worker can use the adjusting component to adjust the distance between the two internal support components on both sides according to the axial length of the tapered aluminum tube. This adjustment is made until the positions of the moving blocks in the two internal support components on both sides correspond to the large end and small end of the inner wall of the tapered aluminum tube, respectively. This allows the three internal support components to internally support and fix tapered aluminum tubes of different lengths, thus making the hanger suitable for tapered aluminum tubes of different axial lengths. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is one of the partial structural schematic diagrams of this utility model;

[0018] Figure 3 For the present utility model Figure 2 Exploded view;

[0019] Figure 4 This is a schematic diagram of the internal support component of this utility model;

[0020] Figure 5 This is a schematic diagram of the adjusting mechanism of this utility model;

[0021] Figure 6 This is a partial structural schematic diagram of the internal support component of this utility model;

[0022] Figure 7 For the present utility model Figure 6 Exploded view;

[0023] Figure 8 This is a schematic diagram of the assembly box and displacement mechanism of this utility model.

[0024] The meanings of the labels in the diagram are as follows:

[0025] 1. Insert body; 11. Movable groove;

[0026] 2. Internal support assembly; 21. Assembly box; 211. Through slot; 22. Moving block; 221. Rack;

[0027] 23. Displacement mechanism; 231. Ring gear; 232. Positioning frame; 233. Worm gear; 234. Worm; 235. Transmission gear; 236. External gear;

[0028] 3. Screw cap; 4. Hook; 5. Threaded rod;

[0029] 6. Nut; 61. Connecting rod; 62. Mounting block. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] Please see Figures 1-8As shown, one of the objectives of this embodiment is to provide an internal support type hanging strip for aluminum tube anodizing treatment, including a strip body 1, which is a cylindrical structure. Both ends of the strip body 1 are threaded with caps 3. A hook 4 is coaxially fixed to the upper side wall of the upper cap 3. During use, the strip body 1 is vertically suspended inside the anodizing equipment via the hooks 4. Three internal support components 2 are arrayed along the axial direction of the strip body 1 on its side wall. The worker first adjusts the middle component... The size of the inner support component 2 is adjusted so that the size of the inner support component 2 located in the middle is larger than the small end opening of the tapered aluminum tube but smaller than the large end opening of the tapered aluminum tube. The best adjusted size is the inner diameter of the middle part of the tapered aluminum tube. Then, the tapered aluminum tube is fitted over the outside of the insert body 1 and the three inner support components 2, with the small end opening of the tapered aluminum tube facing upwards. Then, the worker lifts the tapered aluminum tube upwards through the insert body 1. At this time, the tapered aluminum tube moves downwards under the action of gravity. During the downward movement of the tapered aluminum tube, the inner diameter of the middle part of the tapered aluminum tube... The inner wall and the middle inner support component 2 come into contact, allowing the middle inner support component 2 to support and position the tapered aluminum tube. At this time, both the small end opening and the large end opening of the tapered aluminum tube are suspended. The inner support components 2 on both sides are then close to the small end and the large end of the tapered aluminum tube, respectively. Workers successively insert their hands into the small end opening and the large end opening of the tapered aluminum tube to operate the corresponding inner support components 2, thus internally supporting and fixing the tapered aluminum tube. This allows the three inner support components 2 to support the inner wall of the tapered aluminum tube from bottom to top, near the large end and near the middle end, respectively. The tapered aluminum tube is internally supported and fixed at the middle and near the small end. At this time, the three internal support components 2 prevent the tapered aluminum tube from moving horizontally or vertically downward, thereby fixing the tapered aluminum tube to the outside of the insert body 1. This makes it convenient for workers to use the insert body 1 to suspend the tapered aluminum tube inside the anodizing equipment for anodizing treatment. By internally supporting and fixing the tapered aluminum tube with the three internal support components 2, a support surface can be formed at the large end, middle part and small end of the tapered aluminum tube, ensuring the stability of the tapered aluminum tube after it is fixed to the outside of the insert body 1.

[0033] The structure of the inner support component 2 is detailed below, referring to... Figure 4The inner support assembly 2 includes an assembly box 21, which consists of an annular box coaxially fitted onto the insert body 1 and three rectangular boxes arranged in annular arrays fixed to the circumferential sidewalls of the annular box. When the insert body 1 is vertically suspended, the rectangular boxes are horizontally positioned, and the interiors of the rectangular boxes and the annular boxes are connected. The middle assembly box 21 is fixedly positioned in the middle of the sidewall of the insert body 1, and the two assembly boxes 21 on both sides are slidably fitted onto the insert body 1. Three moving blocks 22 are slidably arranged in annular arrays inside the assembly box 21, that is, the three moving blocks 22 are respectively slidably arranged inside the three rectangular boxes. Three through slots 211 are opened in annular arrays on the side of the assembly box 21 away from the insert body 1, that is, through slots 211 are opened at the ends of the rectangular boxes away from the annular boxes. The ends of the three moving blocks 22 away from the insert body 1 pass through the three through slots 211 and extend... Outward, the through groove 211 restricts the position of the corresponding moving block 22, so that the moving block 22 can only move horizontally towards or away from the insert body 1. The end of the moving block 22 located outside the assembly box 21 is fixed with a rubber pad. A displacement mechanism 23 is provided on the lower side of the assembly box 21. The displacement mechanism 23 is used to drive the three moving blocks 22 to move synchronously towards or away from the insert body 1. When the three rubber pads are in contact with the inner wall of the tapered aluminum tube, the friction between the rubber pads and the inner wall of the tapered aluminum tube restricts the relative sliding between the moving block 22 and the tapered aluminum tube. In this way, the inner support assembly 2 can internally support and fix tapered aluminum tubes with different tapers. When the worker uses the hoisting equipment to hook the hook 4 to lift the insert body 1 upward, the moving block 22 supports the tapered aluminum tube, so that the insert body 1 can lift the tapered aluminum tube upward synchronously through the moving block 22.

[0034] The structure of displacement mechanism 23 is detailed below, referring to... Figure 8The displacement mechanism 23 includes a ring gear 231 coaxially rotatably mounted on the lower side wall of the assembly box 21. L-shaped clamping plates are fixed to the lower side walls of the three rectangular boxes of the assembly box 21. The horizontal sections of the three clamping plates slide in contact with the lower side wall of the ring gear 231, and the vertical sections slide in contact with the inner circumference of the ring gear 231. This restricts the position of the ring gear 231, ensuring that the ring gear 231 will not disengage from the assembly box 21 under gravity, allowing it to rotate only around its own axis. A positioning frame 232 is coaxially fixed to the lower side wall of the ring gear 231. The positioning frame 232 consists of a ring and three straight rods arranged in a ring array fixed to the circumference of the ring. The other end of each straight rod is fixed to the lower side wall of the ring gear 231. The connection between the straight rod and the ring gear 231 is located between two adjacent clamping plates. When the straight rod rotates to the position of the clamping plate closest to it, the moving block... The length of the moving block 22 extending out of the assembly box 21 is the shortest. When the straight rod rotates to the position near the clamping plate on its other side, the length of the moving block 22 extending out of the assembly box 21 is the longest. That is, during the process of the worker adjusting the length of the moving block 22 extending out of the assembly box 21, the straight rod will not collide with the clamping plate. A worm gear 233 and a worm 234 meshing with the worm gear 233 are provided between the positioning frame 232 and the assembly box 21. The worm gear 233 is coaxially fixed to the upper side wall of the positioning frame 232, that is, the worm gear 233 is coaxially fixed to the upper side wall of the ring. The worm 234 is rotatably set on the lower side wall of the assembly box 21. A knob is coaxially fixed at one end of the worm 234, and a large slot is provided between the three straight rods. The position of the knob corresponds to the position of one of the slots. After the tapered aluminum tube is sleeved on the outside of the inner support assembly 2, when the worker puts his hand through the large end opening or the small end opening of the tapered aluminum tube into the inside of the tapered aluminum tube, it is convenient for the worker to put his hand through the slot to hold the knob to rotate the worm 234.

[0035] refer to Figure 7 A rack 221 is fixed on one side of the moving block 22, located outside the assembly box 21. One end of the rack 221 extends towards the insert body 1 from the outside of the assembly box 21. The displacement mechanism 23 also includes three transmission gears 235 arranged in a ring array on the side wall of the assembly box 21. The transmission gears 235 are located outside the ring gears 231 and mesh with the three racks 221 respectively. The side of the transmission gears 235 away from the corresponding racks 221 slides in contact with the assembly box 21. A guide groove is opened laterally on the assembly box 21, that is, the guide groove is opened on one side of the rectangular box. A slider is fixed at the other end of the rack 221 and is slidably arranged inside the guide groove. The slider and the guide groove cooperate to restrict the rack 221 to move laterally only along one side of the assembly box 21, that is, the rack 221 can only move laterally along one side of the rectangular box, so as to prevent the rack 221 from bending and ensure the stable meshing of the rack 221 and the corresponding transmission gears 235.

[0036] Furthermore, an external gear 236 is coaxially fixed on the lower side of the transmission gear 235. The external gear 236 meshes with the ring gear 231. When the worker rotates the worm 234, the meshing transmission between the worm 234 and the worm wheel 233 causes the worm wheel 233 to drive the ring gear 231 to rotate through the positioning frame 232. The meshing transmission between the ring gear 231 and the external gear 236 causes the external gear 236 to drive the corresponding transmission gear 235 to rotate. The meshing transmission between the transmission gear 235 and the corresponding rack 221 causes the rack 221 to drive the corresponding moving block 22 to slide along the inner wall of the rectangular box until the rubber pad on the moving block 22 contacts the predetermined position on the inner wall of the tapered aluminum tube. This allows the inner support assembly 2 to provide inner support and fixation for tapered aluminum tubes with different tapers.

[0037] Different sizes of tapered aluminum tubes have different axial lengths, meaning the distance between the large and small ends of the inner wall of the tapered aluminum tube is different. After the tapered aluminum tube is fitted onto the outside of the three inner support components 2, so that the middle inner support component 2 corresponds to the middle position of the inner wall of the tapered aluminum tube, there is a situation where the positions of the inner support components 2 on both sides cannot correspond to the positions of the inner wall of the tapered aluminum tube near the large and small ends. That is, the inner support components 2 on both sides cannot provide internal support and fixation for the positions of the inner wall of the tapered aluminum tube near the large and small ends, reducing the stability of the internal support and fixation of the tapered tube by the hanger insert. To solve this problem, three movable slots 11 are arranged in a circular array at both ends of the insert body 1. At the same time, an adjustment mechanism is provided on the insert body 1. The adjustment mechanism is used to adjust the distance between the two assembly boxes 21 on both sides and the assembly box 21 in the middle at equal intervals. That is, the adjustment mechanism drives the two assembly boxes 21 on both sides to move relative to each other.

[0038] The following details the structure of the adjusting mechanism, referring to... Figures 3-5The adjustment mechanism includes a threaded rod 5 coaxially disposed inside the insert body 1. Both ends of the threaded rod 5 are rotatably connected to two caps 3. The lower end of the threaded rod 5 rotatably passes through the lower side wall of the cap 3 and is coaxially fixed with a knob, allowing the worker to easily rotate the threaded rod 5 by hand. The adjustment mechanism also includes positive and negative threaded grooves respectively formed on the threaded rod 5 near both ends. Nuts 6 are threadedly connected to both the positive and negative threaded grooves. Three connecting rods 61 are fixed in a circular array on the side wall of the nuts 6. The positions of the six connecting rods 61 correspond to the positions of six movable grooves 11. The other end of each connecting rod 61 passes through the corresponding movable groove 11 and is fixed with a mounting block 62. The six mounting blocks 62 are respectively fixedly installed on two assembly boxes 21 located on both sides. When the worker rotates the threaded rod 5, the movable groove 11 prevents the corresponding connecting rod 6 from rotating. 1. Following the rotation of the threaded rod 5, it connects with the two nuts 6 through the positive and negative thread grooves, causing the two nuts 6 to drive the corresponding connecting rod 61 to move relative to each other. When the connecting rod 61 slides along the inner wall of the corresponding movable groove 11, the connecting rod 61 drives the corresponding assembly box 21 to move through the mounting block 62, thereby causing the two inner support components 2 on both sides to be in relative positions. After the worker aligns the middle inner support component 2 with the middle position of the inner wall of the tapered aluminum tube, he adjusts the distance between the two inner support components 2 on both sides according to the axial length of the tapered aluminum tube, so that the position of the moving block 22 in the two inner support components 2 on both sides corresponds to the large end and small end of the inner wall of the tapered aluminum tube, respectively. This allows the three inner support components 2 to provide internal support and fixation for tapered aluminum tubes of different lengths, making the hanger insert suitable for tapered aluminum tubes of different axial lengths.

[0039] When using this hanging clip, the worker first calculates the distance between the middle position of the inner wall of the tapered aluminum tube and the axis of the tapered aluminum tube. The worker then adjusts the inner support component 2 located in the middle so that the distance between the rubber pad on the moving block 22 and the axis of the clip body 1 is close to the predicted distance from the inner wall of the tapered aluminum tube at the middle position to the axis. Next, the tapered aluminum tube is placed with its small end facing upwards on the outside of the clip body 1 and the three inner support components 2. The worker uses a hoisting device to hook the hook 4 and lift the clip body 1 vertically upwards. At this time, the tapered aluminum tube moves downwards under gravity. The rubber pads on the three moving blocks 22 in the inner support component 2 are all in contact with the middle position of the inner wall of the tapered aluminum tube, positioning the middle part of the tapered aluminum tube. At this point, both the small and large openings of the tapered aluminum tube are suspended in the air. The worker then passes their hand through the tapered aluminum tube. The large end opening is inserted into the interior of the tapered aluminum tube, and the threaded rod 5 is rotated to adjust the distance between the two inner support components 2. This makes the positions of the moving blocks 22 in the two inner support components 2 on both sides correspond to the large end and small end of the inner wall of the tapered aluminum tube, respectively. Then, the worker inserts his hand into the small end opening and the large end opening of the tapered aluminum tube to operate the corresponding inner support components 2, that is, to rotate the worm gear 234 in the inner support component 2. This makes the three moving blocks 22 in the inner support components 2 on both sides move synchronously away from the insert body 1 until the rubber pads on the six moving blocks 22 in the inner support components 2 on both sides are in contact with the inner wall of the tapered aluminum tube. The tapered aluminum tube can then be fixed to the outside of the hanger insert. By suspending the hanger insert and the tapered aluminum tube fixed on the hanger insert inside the anodizing equipment, the tapered aluminum tube can be anodized using the anodizing equipment.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An inner support type hanger insert for an aluminum pipe anodizing process, comprising an insert body (1), characterized by: Three inner support assemblies (2) are arranged on the side wall of the insert body (1) in the axial direction of the insert body (1), the inner support assemblies (2) comprise assembly boxes (21), the middle assembly box (21) is fixedly arranged at the middle position of the side wall of the insert body (1), the two assembly boxes (21) on both sides are slidingly sleeved on the insert body (1), and the insert body (1) is provided with a distance adjusting mechanism, the distance adjusting mechanism is used for adjusting the distance between the two assembly boxes (21) on both sides and the middle assembly box (21) at equal intervals, three moving blocks (22) are slidingly arranged in the inner ring of the assembly box (21), three through grooves (211) are formed in the ring array on the side of the assembly box (21) away from the insert body (1), one end of each of the three moving blocks (22) away from the insert body (1) penetrates through the three through grooves (211) and extends out, and a displacement mechanism (23) is arranged on the lower side of the assembly box (21), the displacement mechanism (23) is used for driving the three moving blocks (22) to move synchronously towards or away from the insert body (1).

2. The inner support type hanger insert bar for aluminum pipe anodizing treatment according to claim 1, characterized by: The displacement mechanism (23) comprises a ring gear (231) coaxially arranged on the lower side wall of the assembly box (21), a positioning frame (232) is coaxially fixed on the lower side wall of the ring gear (231), a worm gear (233) and a worm (234) meshing with the worm gear (233) are arranged between the positioning frame (232) and the assembly box (21), the worm gear (233) is coaxially fixed on the upper side wall of the positioning frame (232), and the worm (234) is rotatably arranged on the lower side wall of the assembly box (21).

3. The inner support type hanger insert bar for aluminum pipe anodizing treatment according to claim 2, characterized by: The moving block (22) is fixed with a rack (221) on one side of the assembly box (21) outside, one end of the rack (221) arranged outside the assembly box (21) extends towards the insert body (1), the displacement mechanism (23) further comprises three transmission gears (235) arranged in a ring array on the side wall of the assembly box (21), the transmission gears (235) are arranged outside the ring gear (231) and mesh with the three racks (221) respectively, and the lower side of the transmission gear (235) is coaxially fixed with an external gear (236), and the external gear (236) is meshed with the ring gear (231).

4. The inner support type hanger insert bar for aluminum pipe anodizing treatment according to claim 1, characterized by: Threaded screws (3) are arranged at both ends of the insert body (1), and three movable grooves (11) are arranged in a ring array at both ends of the insert body (1), the distance adjusting mechanism comprises a threaded rod (5) coaxially arranged in the insert body (1), and both ends of the threaded rod (5) are rotatably connected with the two threaded screws (3).

5. The inner support type hanger insert bar for aluminum pipe anodizing treatment according to claim 4, characterized by: The distance adjusting mechanism further comprises a right thread groove and a reverse thread groove respectively formed on the threaded rod (5) near the two end positions, the right thread groove and the reverse thread groove are both threadedly connected with a nut (6), the side wall of the nut (6) is fixed with three connecting rods (61) in an annular array, the positions of the six connecting rods (61) correspond to the positions of the six movable grooves (11) respectively, the other end of the connecting rod (61) penetrates through the corresponding movable groove (11) and is fixed with a mounting block (62), the six mounting blocks (62) are fixed on the two assembly boxes (21) on the two sides respectively.

6. The inner support type hanger insert bar for aluminum pipe anodizing treatment according to claim 4, characterized by: The upper side wall of the upper rotary cover (3) is coaxially fixed with a hook (4), the lower end of the threaded rod (5) rotates through the lower side wall of the lower rotary cover (3) and is coaxially fixed with a rotary knob.

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