Bending device for steel pipe pretreatment

Abstract

The invention provides a bending device for steel pipe pretreatment, and belongs to the technical field of hollow product manufacturing, the bending device comprises a rack and a bending mechanism arranged at the upper end of the rack and used for bending pipe fittings, and the bending mechanism comprises a first bending assembly which is relatively fixed; the second bending assembly deflects around the first bending assembly; the limiting assembly clamps the first end of the pipe fitting; a plurality of bending channels are formed between the first bending assembly and the second bending assembly, an air blowing device is arranged on the outer side of the limiting assembly, the air blowing device is opposite to the first end of the highest pipe fitting, and communicating devices are arranged at the second ends of the multiple pipe fittings. Clean airflow can be formed in the multiple pipe fittings, chippings generated in the bending process of the multiple pipe fittings are taken away, cleanliness of the inner walls of the pipe fittings is guaranteed, the subsequent electroplating or other machining processes are facilitated, bending machining and cleaning machining are synchronously carried out, the pipe fitting machining procedures are reduced, and the pipe fitting machining efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing hollow products, and particularly to a bending device for steel pipe pretreatment. Background Art

[0002] During the processing of some containers and drainage pipes with special shapes, bending treatment is required to meet the requirements of special shapes and special drainage structures. In order to meet the corrosion resistance requirements during use, it is also necessary to electroplate metal coatings with good corrosion resistance such as aluminum and copper on the inner wall of the pipe.

[0003] For steel pipes with relatively simple shapes and small bending angles, electroplating can be carried out in a batch in a straight pipe state first, and the electroplating process is more efficient, saving time and cost; if electroplating is carried out after bending, the original oxide layer on the surface of the steel pipe may be damaged during the bending process, and the steel pipe is prone to secondary corrosion during the waiting for electroplating, affecting the final product quality.

[0004] There are also some pipes that need to be electroplated more than twice. During the bending process, especially on the side of the pipe interior close to the bending depression, the inner surface area increases, and continuous debris is generated inside the pipe during rapid large-angle bending. In order to meet the requirements of subsequent processing, transportation, and storage, it is necessary for workers to discharge the residual debris inside, increasing the work process and consuming more time. Especially for pipe fittings with large bending angles and multiple different bending directions, it is difficult for workers to effectively utilize gravity to discharge the debris inside, requiring more time and effort, affecting the efficiency and quality of pipe fitting production and processing. Summary of the Invention

[0005] In view of the above problems, the present invention provides a bending device for steel pipe pretreatment, which can form a cleaning air flow inside multiple pipe fittings to carry away the debris generated during the bending process of the multiple pipe fittings, ensuring the cleanliness of the inner wall of the pipe fittings, facilitating subsequent electroplating or other processing processes, synchronizing the bending processing and the cleaning processing, reducing the processing procedures of the pipe fittings, and greatly improving the processing efficiency of the pipe fittings.

[0006] To solve the above problems, the technical solution adopted by the present invention is: A bending device for preprocessing steel pipes, comprising a frame and a bending mechanism arranged at the upper end of the frame for bending pipe fittings, the bending mechanism comprising a relatively fixed bending component 1, a bending component 2 deflected around the bending component 1, and a limiting component for clamping the first end of the pipe fitting; a plurality of bending channels are formed between the bending component 1 and the bending component 2, a blowing device is provided on the outside of the limiting component, the blowing device is opposite to the first end of the highest-positioned pipe fitting, and a plurality of second ends of the pipe fittings are provided with a connecting device, through which the second ends of the plurality of pipe fittings are connected; wherein, during the bending process of the pipe fittings, a clean air flow is blown into the highest-positioned pipe fitting through the blowing device, and the clean air flow passes through the connecting device at the second end and circulates in the remaining pipe fittings to clean the inner walls of the pipe fittings.

[0007] Preferably, the first bending component includes a bending positioning frame, the inner wall of the bending positioning frame is rotatably connected to a bending positioning disk, the side wall of the bending positioning disk is provided with a plurality of limiting grooves, and a bending channel is formed between the limiting grooves and the second bending component.

[0008] Preferably, the communication device includes a communication component, the communication component includes a communication block, the side wall of the communication block is provided with a communication chamber adapted to the outer diameter of the pipe, and a plurality of the communication chambers are vertically arranged and interconnected.

[0009] Preferably, the side wall of the communication block is further provided with a plurality of limit blocks, the vertical cross-section of the limit blocks is trapezoidal, and the limit blocks are located between two adjacent communication chambers.

[0010] Preferably, the inner wall of the connecting chamber is also provided with a horizontally arranged sealing rod, and a sealing airbag is provided at the end of the sealing rod. The sealing airbag has an expanded state and a contracted state. When the sealing airbag is in the expanded state, it is in a sealed fit with the corresponding inner wall of the pipe to prevent the clean airflow from passing through. When the sealing airbag is in the contracted state, it is staggered with the corresponding inner wall of the pipe to allow the clean airflow to pass through.

[0011] Preferably, the communication device further includes a position control component and a slide rail, the slide rail is made of a bendable material, a slide groove is provided at the upper end of the slide rail, and the communication component is slidably connected to the slide rail.

[0012] Preferably, the connecting component is slidably connected to the slide rail through a connecting component, and the connecting component includes a connecting base slidably connected to the slide rail, an air nozzle is provided at the lower end of the connecting base, and a connecting rod is provided at the upper end of the connecting base. The interior of the connecting rod is hollow and is provided with several pump air pipes, the first end of the pump air pipe is connected to the air nozzle, and the second end is connected to the corresponding sealing airbag.

[0013] Preferably, a solenoid valve is arranged inside the air pumping pipeline, and a plurality of the solenoid valves are communicated with a central processing unit. A position sensor is arranged along the length direction of the slide rail, and the position sensor is communicated with the central processing unit for controlling the conduction states of the plurality of solenoid valves.

[0014] Preferably, the air blowing device includes a blowing head adapted to the outer diameter of the pipe fitting, and further includes a telescopic rod for controlling the horizontal telescopic movement of the blowing head.

[0015] Preferably, the limiting assembly includes a clamping and positioning frame I, a bolt is threadedly connected to one side wall of the clamping and positioning frame I, a clamping and positioning plate is arranged at the end of the bolt, and a plurality of pipe fittings are clamped by the clamping and positioning plate.

[0016] The beneficial effects of the present invention are as follows: Compared with the prior art, through the above structural design, by synchronously bending multiple pipe fittings, the bending speed is reduced, and the generation of debris during the bending process is reduced; at the same time, through the combination of the air blowing device and the connecting device, a cleaning air flow can be formed in the multiple pipe fittings, and the cleaning air flow synchronously plays a cleaning role during the bending process, taking away the debris generated during the bending of the multiple pipe fittings, ensuring the cleanliness of the inner wall of the pipe fittings, facilitating subsequent electroplating or other processing processes, synchronously performing the bending processing and the cleaning processing, reducing the processing procedures of the pipe fittings, and greatly improving the processing efficiency of the pipe fittings, especially suitable for the processing of composite pipes with an inner wall plated with aluminum, copper, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0018] Figure 2 is the present invention Figure 1 of the front view structural schematic diagram.

[0019] Figure 3 is the present invention Figure 1 of the top view structural schematic diagram.

[0020] Figure 4 is the present invention Figure 1 of the side view structural schematic diagram.

[0021] Figure 5 is the present invention Figure 2 of the enlarged structural schematic diagram at A.

[0022] Figure 6 is the present invention Figure 3 of the enlarged structural schematic diagram at B.

[0023] Figure 7 is the present invention Figure 4 of the enlarged structural schematic diagram at C.

[0024] Figure 8 Schematic three-dimensional structure diagram of the bending mechanism, connection device and blowing device of the present invention.

[0025] Figure 9 Schematic three-dimensional structure diagram of the connection device of the present invention.

[0026] In the figure: 100, frame; 200, bending mechanism; 210, first bending component; 211, bending positioning frame; 212, bending positioning disc; 220, limiting component; 221, first clamping positioning frame; 222, bolt; 223, clamping positioning plate; 230, second bending component; 231, clamping roller; 232, push plate; 233, second clamping positioning frame; 300, pipe fitting; 400, blowing device; 410, blowing head; 420, telescopic rod; 500, connection device; 510, position control component; 511, electric track; 512, electric slider; 520, connection component; 521, connection base; 522, air nozzle; 523, connecting rod; 530, slide rail; 540, connection component; 541, connection block; 542, limiting block; 543, sealing rod; 544, sealing airbag; 545, connection chamber. Detailed implementation manners

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] In order to solve the problems existing in the background technology, referring to the attached Figure 1 - attached Figure 9 , a bending device for steel pipe pretreatment includes a frame 100 and a bending mechanism 200 arranged at the upper end of the frame 100 for bending pipe fittings 300. The bending mechanism 200 can bend multiple pipe fittings 300 synchronously. Bending multiple pipe fittings 300 simultaneously can reduce the bending rate of the pipe fittings 300 and reduce the generation of debris during the bending process.

[0029] Specifically; the bending mechanism 200 includes a relatively fixed first bending component 210, a second bending component 230 that deflects around the first bending component 210, and a limiting component 220 that clamps the first end of the pipe fitting 300; several bending channels are formed between the first bending component 210 and the second bending component 230. The first bending component 210 is relatively fixed to the frame 100, and the second bending component 230 can rotate around the first bending component 210 as the axis. During the rotation, the straight pipe fitting 300 can be squeezed and bent into a bent pipe fitting 300; the limiting component 220 here can limit and fix the pipe fitting 300 at the first end to ensure the stability of the pipe fitting 300 during the bending process.

[0030] The second bending component 230 can be driven to deflect manually or electrically, and the specific deflection angle is determined according to the angle that the pipe fitting 300 needs to be bent.

[0031] A blowing device 400 is arranged outside the limiting component 220. The blowing device 400 faces the first end of the pipe fitting 300 with the highest position. Through the blowing device 400, high-pressure gas can be blown into the pipe fitting 300 to form a cleaning air flow. Under the action of the cleaning air flow, the debris generated inside the pipe fitting 300 can be carried away, and the inside of the pipe fitting 300 can be cleaned during the bending process, eliminating the need for subsequent manual cleaning and greatly improving the overall processing efficiency of the pipe fitting 300.

[0032] In order to use one blowing device 400 to clean multiple pipe fittings 300, a connecting device 500 is arranged at the second ends of several pipe fittings 300. The second ends of several pipe fittings 300 are connected through the connecting device 500. During the bending process of the pipe fitting 300, a cleaning air flow is blown into the pipe fitting 300 with the highest position through the blowing device 400. The cleaning air flow passes through the connecting device 500 at the second end and circulates in the remaining pipe fittings 300 to achieve the cleaning of the inner walls of the pipe fittings 300. The cleaning air flow bends at the connecting device 500 and enters the corresponding pipe fitting 300 at the lower end, and a cleaning air flow is also formed inside the pipe fitting 300 at the lower end, realizing the cleaning process of multiple pipe fittings 300 below.

[0033] In summary, through the above structural design, by synchronously bending multiple pipe fittings 300, the bending speed is reduced, and the generation of debris during the bending process is reduced. At the same time, by setting the combination of the blowing device 400 and the connecting device 500, a cleaning air flow can be formed inside multiple pipe fittings 300. The cleaning air flow plays a synchronous cleaning role during the bending process, carrying away the debris generated during the bending process of multiple pipe fittings 300, ensuring the cleanliness of the inner walls of the pipe fittings 300, facilitating subsequent electroplating or other processing processes. The bending processing and the cleaning processing are carried out synchronously, reducing the processing procedures of the pipe fitting 300 and greatly improving the processing efficiency of the pipe fitting 300.

[0034] Specifically, the first bending component 210 includes a bending positioning frame 211. A bending positioning disk 212 is rotatably connected to the inner wall of the bending positioning frame 211. A plurality of limiting grooves are formed on the side wall of the bending positioning disk 212. A bending channel is formed between the limiting grooves and the second bending component 230.

[0035] The internal shape of the limiting groove here is determined according to the pipe fitting 300 to be bent. The bending positioning disk 212 is in a relatively limited position under the limitation of the bending positioning frame 211 and will not deflect horizontally during the bending process, and can play a role in limiting and supporting on the inner side of the bending of the pipe fitting 300, ensuring the normal bending and forming of the pipe fitting 300.

[0036] Specifically, the connecting device 500 includes a connecting component 540. The connecting component 540 includes a connecting block 541. A connecting chamber 545 adapted to the outer diameter of the pipe fitting 300 is formed on the side wall of the connecting block 541. A plurality of connecting chambers 545 are arranged vertically and communicate with each other.

[0037] Here, the connecting block 541 can be selected as a vertically arranged rectangle, which can match multiple pipe fittings 300. Here, the width and length of the connecting block 541 and the number of connecting chambers 545 formed on the side wall are determined according to the specifications of the pipe fittings 300 and the number of processed ones. Taking three connecting chambers 545 in the attached drawing as an example, a plurality of connecting chambers 545 are located in the same vertical plane. Preferably, a plurality of connecting chambers 545 are arranged at equal intervals, ensuring that the pipe fittings 300 are in a horizontal and parallel state during the bending process and ensuring the quality of the final bent shape.

[0038] A number of limiting blocks 542 are further arranged on the side wall of the connecting block 541. The vertical section of the limiting block 542 is trapezoidal, and the limiting block 542 is located between two adjacent connecting chambers 545.

[0039] Here, the connecting component 540 can be manually or automatically sleeved on the second ends of a plurality of pipe fittings 300 by machinery. Here, the limiting block 542 can play a role in supporting and limiting. Especially for the pipe fitting 300 with a relatively large length, its second end lacks support and is in a slightly bent state. During the process of sleeving the connecting component 540, the area with a smaller front end dimension of the limiting block 542 enters between the pipe fittings 300, which can play a guiding role to ensure the accurate and stable sleeving of the connecting component 540. At the same time, after the connecting component 540 is sleeved, the root part with a larger dimension of the limiting block 542 (close to the connecting block 541 side) can be located between two pipe fittings 300 to play a role in supporting and limiting, which can ensure that a plurality of pipe fittings 300 are in a relatively stable state for bending processing and ensure the stability of the state of the pipe fittings 300 during the processing.

[0040] It should also be noted that the inner cross-section of the connecting chamber 545 can also be selected to be in the state of a flared opening, with a larger outer dimension and a smaller inner dimension, which can guide the pipe fitting 300, improve the docking and sleeving efficiency of the connecting component 540 with a plurality of pipe fittings 300, and can also adapt to pipe fittings 300 with different calibers. A sealing gasket is installed on the inner wall of the connecting chamber 545, which can be adapted to the end of the second end of the pipe fitting 300. After being stably extruded, it can strengthen the overall sealing performance, ensure the stability of the high-pressure air flow in a plurality of pipe fittings 300, and avoid gas leakage from affecting the overall cleaning effect.

[0041] When there are more than three pipe fittings 300, the gas blown into one pipe fitting 300 needs to be diverted to multiple pipe fittings 300, which reduces the flow rate of the gas in the multiple pipe fittings 300 below and reduces the airflow cleaning effect. In order to solve the above problems, a horizontally arranged sealing rod 543 is also provided on the inner wall of the connecting chamber 545, and a sealing airbag 544 is provided at the end of the sealing rod 543. The sealing airbag 544 has an expanded state and a contracted state. When the sealing airbag 544 is in the expanded state, it is in a sealed fit with the inner wall of the corresponding pipe fitting 300 to prevent the clean airflow from passing through. When the sealing airbag 544 is in the contracted state, it is staggered with the inner wall of the corresponding pipe fitting 300 to allow the clean airflow to pass through.

[0042] Through the above-mentioned structural design, the conduction state of the pipe 300 can be adjusted by controlling the expansion state of the sealing airbag 544. During the cleaning process, multiple sealing airbags 544 are controlled to be conductive in turn, and only one pipe 300 can be controlled to be in a connected state with the top pipe 300, thereby avoiding the high-pressure gas from being diverted to more pipes 300 and ensuring the stability of the high-pressure airflow circulating in the pipe 300.

[0043] It should be noted that after the collision, the outer walls of the sealing airbag 544 here can fit tightly with the inner wall of the pipe 300, thereby achieving a good sealing effect. At the same time, the expanded inner side of the sealing airbag 544 (the side close to the connecting block 541) is arc-shaped, and the inner part is located in the connecting chamber 545. Through the above structural design, the arc-shaped sealing airbag 544 can guide the debris generated at the top to prevent the debris from entering the interior of the pipe 300 below, avoiding the residue of debris and affecting the overall cleaning effect. At the same time, it also prevents debris from remaining on the surface of the sealing airbag 544 and affecting the subsequent sealing effect.

[0044] Specifically, the connecting device 500 also includes a position control component 510 and a slide rail 530. The slide rail 530 is made of a bendable material. A slide groove is provided at the upper end of the slide rail 530. The connecting component 540 is slidably connected to the slide rail 530. Through the above structural design, the connecting component 540 can be automatically sleeved on the second end of multiple pipes 300. At the same time, during the bending process of the pipe 300, the connecting component 540 can be supported, guided and positioned to ensure the stability of the connecting component 540 during the bending and cleaning process.

[0045] The position control component 510 here includes an electric track 511 and an electric slider 512. The electric slider 512 is fixedly connected to the slide rail 530. The electric track 511 here is consistent with the length direction of the pipe 300 in the initial state. The electric track 511 can drive the electric slider 512 and the slide rail 530 to move linearly, control the connecting component 540 to move along the length direction of the pipe 300, and put the connecting component 540 on the outside of multiple pipes 300.

[0046] The sliding rail 530 and the connecting component 540 are slidably connected here. During the bending process, the connecting component 540 moves along an arc path. During the movement of the connecting component 540, it can drive the sliding rail 530 to bend. During the bending process, the force direction between the pipe fitting 300 and the connecting component 540 is the side wall, that is, the inner wall of the pipe fitting 300 abuts against the outer inner wall of the connecting component 540. Under the action of friction, the stability between the pipe fitting 300 and the connecting component 540 can be ensured to avoid detachment; for the cleaning air flow with larger size and higher pressure, a locking device can be provided on the outside of the connecting component 540 to lock and fix the pipe fitting 300, further avoiding the detachment of the connecting component 540 from the pipe fitting 300.

[0047] A reset elastic element or an electrically driven reset element can be provided between the sliding rail 530 and the connecting component 540. After the pipe fitting 300 is bent, after controlling the separation of the connecting component 540 from the pipe fitting 300, the sliding rail 530 here has a reset elastic recovery to the initial straight state, and the connecting component 540 here can also be reset to the initial position close to the position control component 510, preparing for the subsequent continuous bending processing of the pipe fitting 300 without the need for staff to reset, further improving the processing efficiency.

[0048] Specifically, the connecting component 540 is slidably connected to the sliding rail 530 through the connecting component 520. The connecting component 520 includes a connecting base 521 slidably connected to the sliding rail 530. A nozzle 522 is provided at the lower end of the connecting base 521, and a connecting rod 523 is provided at the upper end of the connecting base 521. The inside of the connecting rod 523 is hollow and provided with a number of air pumping pipes. The first end of the air pumping pipe is communicated with the nozzle 522, and the second end is communicated with the corresponding sealing airbag 544.

[0049] The outside of the nozzle 522 is communicated with an air pump through a hose. By pumping gas into the nozzle 522 through the air pump, the gas can pass through the connecting rod 523 and enter the corresponding sealing airbag 544 to control its inflation, realizing the inflation control of the sealing airbag 544; the sealing airbag 544 here can be selected as an airbag with shrinkage elasticity, and a deflation opening is provided on the surface of the sealing airbag 544. After stopping pumping air, the gas in the sealing airbag 544 can be automatically discharged under the action of shrinkage elasticity, realizing the shrinkage control of the sealing airbag 544.

[0050] During the bending process of the pipe fitting 300, the connecting component 540 moves synchronously. During the movement of the connecting component 540, gas is pumped into different sealing airbags 544. Each time, only one sealing airbag 544 is controlled to be in a contracted state, and the pipe fitting 300 corresponding to the contracted state sealing airbag 544 is controlled to be in a conducting and cleaning state, realizing the discharge of debris.

[0051] Further, a solenoid valve is provided inside the air pumping pipeline. A plurality of solenoid valves are connected to a central processing unit. A position sensor is arranged along the length direction of the slide rail 530. The position sensor is connected to the central processing unit for controlling the conduction states of the plurality of solenoid valves.

[0052] During the bending process, the connection component 540 can slide along the slide rail 530. During the sliding process, the position of the connection component 540 can be detected by the position sensor, and the position information is transmitted into the central processing unit. The central processing unit controls the corresponding solenoid valve to be in a closed or conducting state according to the obtained position information, controls that only one sealing airbag 544 is in a contracted state, and controls the pipe fitting 300 corresponding to the contracted sealing airbag 544 to be in a conducting and cleaning state, so as to discharge the debris.

[0053] Specifically, the air blowing device 400 includes a blowing head 410 adapted to the outer diameter of the pipe fitting 300, and further includes a telescopic rod 420 for controlling the horizontal telescopic movement of the blowing head 410. Controlling the telescopic rod 420 to extend can control the blowing head 410 to move towards the first end of the topmost pipe fitting 300, and control the blowing head 410 to be in sealing fit with the first end of the pipe fitting 300. At the same time, the blowing head 410 here is externally connected to an air pumping device, and can pump high-pressure gas into the topmost pipe fitting 300 to form a high-pressure air flow, ensuring the stability of the cleaning of the debris inside the pipe fitting 300.

[0054] Specifically, the limiting component 220 includes a clamping and positioning frame one 221. A bolt 222 is threadedly connected to the side wall of the clamping and positioning frame one 221. A clamping and positioning plate 223 is arranged at the end of the bolt 222. A plurality of pipe fittings 300 are clamped by the clamping and positioning plate 223, and the pipe fittings 300 are placed at a predetermined position. By rotating the bolt 222, the clamping and positioning plate 223 can be driven to move to different positions. By abutting the clamping and positioning plate 223 against the inner wall of the U-shaped clamping and positioning frame one 221, clamping and fixing are realized, ensuring that the pipe fitting 300 is in a stable state during the bending process.

[0055] The bending component two 230 here includes a clamping roller 231, a push plate 232 and a clamping and positioning frame two 233. Here, the push plate 232 and the clamping and positioning frame two 233 are in a sliding state. The clamping roller 231 is in abutting contact with the convex side of the pipe fitting 300 during bending. At the same time, a position control and adjustment component is connected to the outside of the push plate 232, which can adjust the horizontal movement of the clamping roller 231 and control the position of the clamping roller 231, so as to realize the clamping and loosening of the pipe fitting 300 and realize the adjustment and control.

[0056] During the bending process of the pipe fitting 300, first place multiple pipe fittings 300 at the corresponding position on one side of the bending positioning disk 212. Subsequently, adjust the clamping roller 231 to move towards the pipe fitting 300 through the push plate 232. The pipe fitting 300 can be tightly clamped and limited on both sides by the clamping roller 231 and the bending positioning disk 212 to ensure stability. Subsequently, control the second bending assembly 230 to rotate around the first bending assembly 210. During the rotation process, the clamping roller 231 continuously fits with the outer side of the pipe fitting 300 to achieve the bending control of the pipe fitting 300.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bending device for pre-processing a steel pipe, comprising a frame (100) and a bending mechanism (200) disposed at the upper end of the frame (100) for bending a pipe (300), characterized in that: The bending mechanism (200) includes a relatively fixed bending component 1 (210), a bending component 2 (230) deflected around the bending component 1 (210), and a limiting component (220) for clamping the first end of the pipe (300); a plurality of bending channels are formed between the bending component 1 (210) and the bending component 2 (230); a blowing device (400) is provided on the outside of the limiting component (220), the blowing device (400) is opposite to the first end of the highest-positioned pipe (300), and a connecting device (500) is provided on the second ends of the plurality of pipes (300), and the second ends of the plurality of pipes (300) are connected through the connecting device (500); During the bending process of the pipe fitting (300), a clean air flow is blown into the pipe fitting (300) at the highest position through the blowing device (400), and the clean air flow passes through the connecting device (500) at the second end and circulates in the remaining pipe fittings (300) to clean the inner wall of the pipe fitting (300).

2. The bending device for steel pipe pretreatment according to claim 1, characterized in that, The bending component 1 (210) includes a bending positioning frame (211), the inner wall of the bending positioning frame (211) is rotatably connected to a bending positioning disk (212), and the side wall of the bending positioning disk (212) is provided with a plurality of limiting grooves, forming a bending channel between the limiting grooves and the bending component 2 (230).

3. A bending device for steel pipe pretreatment according to claim 1, characterized in that, The communication device (500) comprises a communication component (540), the communication component (540) comprises a communication block (541), a side wall of the communication block (541) is provided with a communication chamber (545) adapted to the outer diameter of the pipe (300), and a plurality of the communication chambers (545) are arranged vertically and communicate with each other.

4. A bending device for steel pipe pretreatment according to claim 3, characterized in that, The side wall of the communication block (541) is further provided with a plurality of limit blocks (542), the vertical cross-section of the limit blocks (542) being trapezoidal, and the limit blocks (542) are located between two adjacent communication chambers (545).

5. A bending device for steel pipe pretreatment according to claim 3, characterized in that, The inner wall of the communicating chamber (545) is further provided with a horizontally arranged sealing rod (543), and a sealing airbag (544) is provided at the end of the sealing rod (543). The sealing airbag (544) has an expanded state and a contracted state. When the sealing airbag (544) is in the expanded state, it is in a sealed fit with the inner wall of the corresponding pipe (300) to prevent the clean airflow from passing through. When the sealing airbag (544) is in the contracted state, it is staggered with the inner wall of the corresponding pipe (300) to allow the clean airflow to pass through.

6. The bending device for steel pipe pretreatment according to claim 5, characterized in that, The connecting device (500) further comprises a position control component (510) and a slide rail (530), wherein the slide rail (530) is made of a bendable material, a slide groove is provided at the upper end of the slide rail (530), and the connecting component (540) is slidably connected to the slide rail (530).

7. A bending device for steel pipe pretreatment according to claim 6, characterized in that, The connected component (540) is slidably connected to the slide rail (530) through the connecting component (520). The connecting component (520) includes a connecting base (521) slidably connected to the slide rail (530). A nozzle (522) is provided at the lower end of the connecting base (521). A connecting rod (523) is provided at the upper end of the connecting base (521). The inside of the connecting rod (523) is hollow and provided with a plurality of air pumping pipelines. The first end of the air pumping pipeline is communicated with the nozzle (522), and the second end is communicated with the corresponding sealing airbag (544).

8. A bending device for steel pipe pretreatment according to claim 7, characterized in that, An electromagnetic valve is provided inside the air pumping pipeline. The plurality of electromagnetic valves are communicated with a central processing unit. A position sensor is arranged along the length direction of the slide rail (530). The position sensor is communicated with the central processing unit to control the conduction states of the plurality of electromagnetic valves.

9. A bending device for steel pipe pretreatment according to claim 1, characterized in that, The air blowing device (400) includes a blowing head (410) adapted to the outer diameter of the pipe fitting (300), and further includes a telescopic rod (420) for controlling the horizontal telescopic movement of the blowing head (410).

10. A bending device for steel pipe pretreatment according to claim 1, characterized in that, The limiting component (220) includes a first clamping and positioning frame (221). A bolt (222) is threadedly connected to the side wall of the first clamping and positioning frame (221). A clamping and positioning plate (223) is arranged at the end of the bolt (222). A plurality of pipe fittings (300) are clamped by the clamping and positioning plate (223).

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