One-step m-shaped tube bending device and installation method

Abstract

This invention provides a one-time forming M-shaped pipe bending device and installation method, comprising: a top block mechanism, a rotating frame mechanism, a positioning mechanism, and a frame; the top block mechanism, the rotating frame mechanism, and the positioning mechanism are mounted on the frame; the guide tube to be bent is connected to the positioning mechanism and positioned by the positioning mechanism; the guide tube to be bent is bent by the top block mechanism in conjunction with the rotating frame mechanism; a first pressure roller is provided at one end of the top block mechanism facing the guide tube to be bent; the rotating frame mechanism is provided with a second pressure roller and a pressure block forming an angle; the guide tube to be bent is placed between the second pressure roller and the pressure block; the guide tube to be bent is formed by the pressing of the first pressure roller in conjunction with the bending of the second pressure roller and the pressure block. This invention can bend M-shaped guide tubes, and compared with traditional manual pipe bending methods, this invention can achieve one-time bending of M-shaped guide tubes, improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of aerospace parts manufacturing, specifically to a one-time forming M-shaped tube bending device and installation method. Background Technology

[0002] M-shaped conduits are widely used in the aerospace field. Traditional manual or mechanical pipe bending methods often cannot achieve one-time forming for irregularly shaped conduits such as M-shaped tubes, resulting in low processing efficiency. Furthermore, the forming degree of the conduit is difficult to control, and the conduit is prone to under-bending or over-bending. In addition, it can cause surface quality problems such as scratches and dents, reducing the product yield. For example, patent document CN106607485A discloses a manual pipe bending machine, including a frame, a main shaft, and a rotating plate rotatably connected to the main shaft. A bending die is mounted on the main shaft via a key. A roller box, a pipe holder, and a handle are mounted on the rotating plate, with the bending die positioned above the rotating plate. The roller box contains a rolling pressure roller and a guide roller. An adjusting bolt is screwed onto the handle, with its end contacting the roller box. The roller box is connected to a pressure spring via a connecting rod, and the other end of the pressure spring is mounted on an outer baffle located on the rotating plate. Current conditions place higher demands on conduit bending processing technology. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a one-time forming M-shaped pipe bending device and its installation method.

[0004] A one-time forming M-shaped tube bending device according to the present invention includes: a top block mechanism, a rotating frame mechanism, a positioning mechanism, and a frame;

[0005] The top block mechanism, the rotating frame mechanism, and the positioning mechanism are mounted on the frame. The guide tube to be bent is connected to the positioning mechanism and positioned by the positioning mechanism. The guide tube to be bent is bent by the top block mechanism in conjunction with the rotating frame mechanism.

[0006] The top block mechanism is provided with a first pressure roller facing one end of the guide tube to be bent, and the rotating frame mechanism is provided with a second pressure roller and a pressure block forming an angle. The guide tube to be bent is placed between the second pressure roller and the pressure block. The guide tube to be bent is formed by the punching of the first pressure roller and the bending of the second pressure roller and the pressure block.

[0007] Preferably, the rotating frame mechanism includes: a horizontal servo motor, a second coupling, a lead screw and slider, a positive and negative lead screw, a second pressure roller, a rotating frame, a pressure block, and a movable top pin;

[0008] The output end of the horizontal servo motor is connected to the positive and negative lead screws through a second coupling. The lead screw slider is threaded onto the positive and negative lead screws. One end of the rotating frame is movably connected to the lead screw slider, and the other end is connected to the second pressure roller. The second pressure roller is mounted on the frame through the rotating frame mounting base.

[0009] The movable top pin is connected to the rotating frame, the guide tube to be bent is located between the movable top pin and the rotating frame, and the pressure block is provided between the movable top pin and the guide tube to be bent. When the rotating frame rotates around the rotating frame mounting base, the pressure block and the movable top pin rotate together with the rotating frame.

[0010] Preferably, the top block mechanism includes: a vertical servo motor, a first coupling, a first sliding lead screw, a top block, a first pressure roller, and a fixing pin;

[0011] The vertical servo motor is mounted on the frame, and the output end of the vertical servo motor is connected to the first sliding screw through the first coupling. The first sliding screw is threadedly connected to the top block and allows the top block to move axially. The top block is connected to the first pressure roller through a fixing pin at the end facing the guide tube to be bent.

[0012] Preferably, the positioning mechanism includes: a handwheel, a fixed base, a second sliding screw, and a positioning block;

[0013] The second sliding screw is mounted on the frame via a fixed base. One end of the second sliding screw is connected to the handwheel, and the other end is threaded to the positioning block. One end of the guide tube to be bent is fixed to the positioning block.

[0014] Preferably, the lead screw slider and the second pressure roller, rotating frame, pressure block and movable top pin connected to the lead screw slider are provided in two sets, and the sliding directions of the two sets of lead screw sliders are opposite to those of the positive and negative lead screws.

[0015] Preferably, the horizontal servo motor is fixedly mounted on the frame, and a fixed base is fixedly mounted on the frame. The end of the positive and negative lead screw away from the horizontal servo motor is supported and limited by the fixed base.

[0016] Preferably, the shapes of the second pressure roller, the pressure block, and the first pressure roller are adapted to the shape of the guide tube to be bent.

[0017] Preferably, the top block mechanism further includes: a pressure plate;

[0018] The top block is provided with pressure plates at both ends perpendicular to the direction of movement of the top block, and the top block is slidably connected to the pressure plates and limited by the pressure plates in the direction of vertical movement.

[0019] Preferably, one side of the guide tube to be bent consists of two second pressure rollers, and the other side consists of the first pressure roller and two pressure blocks, with the first pressure roller located between the two pressure blocks.

[0020] Preferably, a keyway is provided in the rotating frame, and a key is provided on the lead screw slider. The key is installed in the keyway and allows sliding and rotation along the keyway.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention can bend M-shaped conduits. Compared with the traditional manual conduit bending method, this invention can achieve M-shaped conduits in one bending process, thus improving production efficiency.

[0023] 2. Compared with traditional mechanical pipe bending methods, this invention can control the bending angle and speed of the guide tube by working with a servo motor, resulting in better guide tube forming. Moreover, different forming angles can be achieved by adjusting the position of the pressure roller and the rotating frame.

[0024] 3. The present invention uses a first pressure roller, a second pressure roller, and a pressure block that are adapted to the shape of the conduit to be bent to contact the conduit to be bent and apply force. The contact surface fits well with the conduit to be bent, and the bending process does not cause surface damage to the conduit. Attached Figure Description

[0025] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the pipe bending device;

[0027] Figure 2 This is a schematic diagram illustrating the principle of pipe bending.

[0028] As shown in the figure:

[0029] Detailed Implementation

[0030] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0031] Example 1

[0032] like Figure 1As shown, this embodiment includes: a top block mechanism 1, a rotating frame mechanism 2, a positioning mechanism 3, and a frame 4. The top block mechanism 1, the rotating frame mechanism 2, and the positioning mechanism 3 are mounted on the frame 4. The guide tube to be bent is connected to the positioning mechanism 3 and positioned by the positioning mechanism 3. The guide tube to be bent is bent by the top block mechanism 1 in conjunction with the rotating frame mechanism 2. The top block mechanism 1 includes: a vertical servo motor 11, a first coupling 12, a first sliding lead screw 13, a top block 14, a pressure plate 15, a first pressure roller 16, and a fixing pin 17. The rotating frame mechanism 2 includes: a horizontal servo motor 21, a second coupling 22, a lead screw slider 23, a forward and reverse lead screw 24, a second pressure roller 25, a rotating frame 26, a first fixed seat 27, a pressure block 28, and a movable top pin 29. The positioning mechanism 3 includes: a handwheel 31, a second fixed seat 32, a second sliding lead screw 33, and a positioning block 34. After the vertical servo motor 11 is connected to the frame 4, it is connected to the first sliding lead screw 13 via the first coupling 12. The first sliding lead screw 13 is connected to the top block 14, and the first pressure roller 16 is connected to the bottom of the top block 14 via the fixing pin 17. The two ends of the top block 14 in the vertical movement direction are pressed onto the frame 4 by the pressure plates 15. After the horizontal servo motor 21 is connected to the frame 4, it is connected to the positive and negative lead screws 24 via the second coupling 22. The other end of the positive and negative lead screws 24 is connected to the frame 4 via the first fixed seat 27. The two lead screw sliders 23 are respectively installed on the positive and negative lead screws 24. At both ends of the reverse lead screw 24, the lead screw slider 23 is connected to the keyway of the rotating frame 26 via a key. The rotating frame 26 and the second pressure roller 25 are mounted on the rotating frame mounting base 41 of the machine frame 4. A movable top pin 29 is installed on the rotating frame 26. A pressure block 28 is installed between the movable top pin 29 and the guide tube to be bent. The guide tube to be bent is placed between the second pressure roller 25 and the pressure block 28. The handwheel 31 is connected to the second sliding lead screw 33. The second sliding lead screw 33 is connected to the inside of the positioning block 34. Then, the second sliding lead screw 33 is connected to the machine frame 4 by the second fixed base 32. The guide tube to be bent is installed on the upper side of the second pressure roller 25 and the lower side of the pressure block 28 of the rotating frame mechanism 2. The positioning mechanism 3 is used for the horizontal positioning of the guide tube to be bent. When the device is working, the top block mechanism 1 drives the first sliding screw 13 to move through the vertical servo motor 11, which drives the first pressure roller 16 to bend the middle of the guide tube to be bent. The rotating frame mechanism 2 drives the forward and reverse screws 24 to move through the horizontal servo motor 21, and the screw slider 23 and the rotating frame 26 drive the pressure block 28 to bend both ends of the guide tube to be bent.

[0033] Specifically, a vertical servo motor 11 is mounted on the frame 4. The output end of the vertical servo motor 11 is connected to a first sliding lead screw 13 via a first coupling 12. The first sliding lead screw 13 is threadedly connected to a top block 14 and allows the top block 14 to move axially. The end of the top block 14 facing the guide tube to be bent is connected to a first pressure roller 16 via a fixing pin 17. Pressure plates 15 are provided at both ends of the top block 14 perpendicular to the direction of movement of the top block 14. The top block 14 is slidably connected to the pressure plates 15 and limited in the vertical direction of movement by the pressure plates 15.

[0034] The output end of the horizontal servo motor 21 is connected to the positive and negative lead screws 24 via a second coupling 22. A lead screw slider 23 is threaded onto the positive and negative lead screws 24. One end of the rotating frame 26 is movably connected to the lead screw slider 23, and the other end is connected to the second pressure roller 25. A keyway is provided inside the rotating frame 26, and a key is provided on the lead screw slider 23. The key is installed in the keyway and allows sliding and rotation along the keyway. The second pressure roller 25 is mounted on the frame 4 via a rotating frame mounting base 41. A movable top pin 29 connects to the rotating frame 26. The guide tube to be bent is located between the movable top pin 29 and the rotating frame 26. A pressure block 28 is provided between the movable top pin 29 and the guide tube to be bent. When the rotating frame 26 rotates around the rotating frame mounting base 41, the pressure block 28 and the movable top pin 29 rotate together with the rotating frame 26. The horizontal servo motor 21 is fixedly mounted on the frame 4, and a first fixed base 27 is fixedly mounted on the frame 4. The end of the positive and negative lead screws 24 away from the horizontal servo motor 21 is supported and limited by the first fixed base 27. Two sets of lead screw sliders 23, second pressure rollers 25 connected to the lead screw sliders 23, rotating frame 26, pressure blocks 28, and movable top pins 29 are provided. The sliding directions of the two sets of lead screw sliders 23 relative to the positive and negative lead screws 24 are opposite. One side of the guide tube to be bent has two second pressure rollers 25, and the other side has a first pressure roller 16 and two pressure blocks 28, with the first pressure roller 16 located between the two pressure blocks 28.

[0035] The second sliding screw 33 is mounted on the frame 4 via the second fixed seat 32. One end of the second sliding screw 33 is connected to the handwheel 31, and the other end is threaded to the positioning block 34. One end of the guide tube to be bent is fixed on the positioning block 34.

[0036] The second pressure roller 25 and the pressure block 28 form an angle. The guide tube to be bent is placed between the second pressure roller 25 and the pressure block 28. The guide tube to be bent is formed by the punching of the first pressure roller 16 and the bending of the second pressure roller 25 and the pressure block 28. At the same time, the shapes of the second pressure roller 25, the pressure block 28 and the first pressure roller 16 are adapted to the shape of the guide tube to be bent, the contact surface fits the guide tube well, and the bending process does not cause surface damage to the guide tube.

[0037] Combination Figure 2As shown, before bending the guide tube, the working programs for the vertical servo motor 11 and the horizontal servo motor 21 are prepared. The guide tube to be bent is placed on the second pressure roller 25 of the rotating frame mechanism 2. The pressure block 28 is installed above the guide tube to be bent and below the movable top pin 29. The handwheel 31 is turned, and the horizontal position of the positioning block 34 is adjusted by the movement of the second sliding screw 33 to achieve the horizontal position adjustment of the guide tube to be bent. When the tube bending device is working, the vertical servo motor 11 transmits the motion to the top block 14 through the first coupling 12 and the first sliding screw 13. The pressure plate 15 positions the top block 14, so that the top block 14 can move up and down. During the bending process, the first pressure roller 16 at the bottom of the top block 14 contacts the guide tube to be bent and applies force to achieve bending and forming of the middle part of the guide tube; when the bending device is working, the horizontal servo motor 21 transmits the motion to the lead screw slider 23 through the second coupling 22 and the positive and negative lead screws 24, and the lead screw slider 23 then transmits it to the rotating frame 26. The rotating frame 26 rotates around the rotating frame mounting base 41, and the movable top pin 29 and pressure block 28 move accordingly. The pressure block 28 and the second pressure roller 25 on the rotating frame mounting base 41 contact the guide tube to be bent and apply force to achieve bending and forming of both ends of the guide tube, thereby realizing the one-time bending and forming of the M-shaped guide tube.

[0038] Example 2

[0039] Example 2 is a preferred example of Example 1.

[0040] like Figure 1 As shown, the top block mechanism 1 consists of a vertical servo motor 11, a first coupling 12, a first sliding lead screw 13, a top block 14, a pressure plate 15, and a first pressure roller 16. The vertical servo motor 11 and the pressure plate 15 are connected to the frame 4 by bolts. The first pressure roller 16 is connected to the bottom of the top block 14 by a fixing pin 17. The first sliding lead screw 13 is connected to the top block 14 inside the top block 14. The left and right ends of the top block 14 are positioned by the pressure plate 15. The rotating frame mechanism 2 consists of a horizontal servo motor 21, a second coupling 22, a lead screw slider 23, a positive and negative lead screw 24, a second pressure roller 25, a rotating frame 26, a first fixed seat 27, and a pressure block 28. The horizontal servo motor 21 and the first fixed seat 27 are connected to the frame 4 by bolts. The rotating frame 26 is connected to the frame 4 by a rotating frame mounting seat 41. The threads at the left and right ends of the positive and negative lead screw 24 are opposite, with one end being a left-hand thread and the other end being a right-hand thread. Two lead screw sliders 23 are respectively installed at the two ends of the positive and negative lead screw 24. The lead screw sliders 23 are connected to the keyway of the rotating frame 26 by keys. The bending angle of the rotating frame 26 is 120-160°. A movable top pin 29 is installed at the upper end of the rotating frame 26. A pressure block 28 is installed between the movable top pin 29 and the guide tube to be bent. The positioning mechanism 3 consists of a handwheel 31, a second fixed seat 32, a second sliding screw 33, and a positioning block 34. The second fixed seat 32 is connected to the frame 4 by bolts, and the second sliding screw 33 is connected to the positioning block 34 inside the positioning block 34. The contact surfaces of the first pressure roller 16, the second pressure roller 25, the pressure block 28, and the guide tube to be bent are cylindrical surfaces.

[0041] This embodiment also provides an installation method for a one-time forming M-shaped pipe bending device, including the following steps:

[0042] Step 1: Install the top block mechanism 1 and connect it to the frame 4: Connect the vertical servo motor 11 to the frame 4 with bolts, and then connect it to the first sliding screw 13 through the first coupling 12. Connect the first sliding screw 13 to the inside of the top block 14. Connect the first pressure roller 16 to the bottom of the top block 14 through the fixing pin 17. The left and right ends of the top block 14 are pressed onto the frame 4 by the pressure plate 15 with bolts.

[0043] Step 2: Install the rotating frame mechanism 2 and connect it to the frame 4: Connect the horizontal servo motor 21 to the frame 4 with bolts, and then connect it to the positive and negative lead screws 24 through the second coupling 22. The other end of the positive and negative lead screws 24 is connected to the frame 4 by bolts through the first fixed seat 27. Two lead screw sliders 23 are respectively installed at both ends of the positive and negative lead screws 24. The lead screw sliders 23 are connected to the keyway of the rotating frame 26 through a key. The rotating frame 26 and the second pressure roller 25 are installed on the rotating frame mounting base 41. A movable top pin 29 is installed in the hole at the upper end of the rotating frame 26. A pressure block 28 is installed between the movable top pin 29 and the guide tube to be bent. The guide tube to be bent is placed between the second pressure roller 25 and the pressure block 28.

[0044] Step 3: Install the positioning mechanism 3 and connect it to the frame 4: Connect the handwheel 31 to the second sliding screw 33, the second sliding screw 33 is connected to the inside of the positioning block 34, and then connect the second sliding screw 33 to the frame 4 via bolts from the second fixed seat 32.

[0045] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A one-time forming M-shaped pipe bending device, characterized in that, include: Top block mechanism (1), rotating frame mechanism (2), positioning mechanism (3) and frame (4); The top block mechanism (1), the rotating frame mechanism (2) and the positioning mechanism (3) are installed on the frame (4). The guide tube to be bent is connected to the positioning mechanism (3) and positioned by the positioning mechanism (3). The guide tube to be bent is bent by the top block mechanism (1) in conjunction with the rotating frame mechanism (2). The top block mechanism (1) is provided with a first pressure roller (16) facing one end of the guide tube to be bent, and the rotating frame mechanism (2) is provided with a second pressure roller (25) and a pressure block (28) forming an angle. The guide tube to be bent is placed between the second pressure roller (25) and the pressure block (28). The guide tube to be bent is formed by the punching of the first pressure roller (16) in conjunction with the bending of the second pressure roller (25) and the pressure block (28). The rotating frame mechanism (2) includes: a horizontal servo motor (21), a second coupling (22), a lead screw slider (23), a positive and negative lead screw (24), a second pressure roller (25), a rotating frame (26), a pressure block (28), and a movable top pin (29). The output end of the horizontal servo motor (21) is connected to the positive and negative lead screw (24) through the second coupling (22). The lead screw slider (23) is threaded on the positive and negative lead screw (24). One end of the rotating frame (26) is movably connected to the lead screw slider (23), and the other end is connected to the second pressure roller (25). The second pressure roller (25) is mounted on the frame (4) through the rotating frame mounting base (41). The movable top pin (29) is connected to the rotating frame (26). The guide tube to be bent is located between the movable top pin (29) and the rotating frame (26). The pressure block (28) is provided between the movable top pin (29) and the guide tube to be bent. When the rotating frame (26) rotates around the rotating frame mounting base (41), the pressure block (28) and the movable top pin (29) rotate together with the rotating frame (26).

2. The one-time forming M-shaped pipe bending device according to claim 1, characterized in that, The top block mechanism (1) includes: a vertical servo motor (11), a first coupling (12), a first sliding screw (13), a top block (14), a first pressure roller (16), and a fixing pin (17). The vertical servo motor (11) is mounted on the frame (4). The output end of the vertical servo motor (11) is connected to the first sliding screw (13) through the first coupling (12). The first sliding screw (13) is threadedly connected to the top block (14) and allows the top block (14) to move axially. The top block (14) is connected to the first pressure roller (16) at the end of the guide tube to be bent through the fixing pin (17).

3. The one-time forming M-shaped pipe bending device according to claim 1, characterized in that, The positioning mechanism (3) includes: a handwheel (31), a second fixed seat (32), a second sliding screw (33), and a positioning block (34); The second sliding screw (33) is mounted on the frame (4) via the second fixed seat (32). One end of the second sliding screw (33) is connected to the handwheel (31), and the other end is threaded to the positioning block (34). One end of the guide tube to be bent is fixed on the positioning block (34).

4. The one-time forming M-shaped pipe bending device according to claim 1, characterized in that: The lead screw slider (23) and the second pressure roller (25), rotating frame (26), pressure block (28) and movable top pin (29) connected to the lead screw slider (23) are provided in two sets, and the sliding directions of the two sets of lead screw sliders (23) are opposite to those of the positive and negative lead screws (24); One side of the guide tube to be bent has two second pressure rollers (25), and the other side has the first pressure roller (16) and two pressure blocks (28), with the first pressure roller (16) located between the two pressure blocks (28).

5. The one-time forming M-shaped pipe bending device according to claim 1, characterized in that: The horizontal servo motor (21) is fixedly mounted on the frame (4), and the first fixed seat (27) is fixedly mounted on the frame (4). The end of the positive and negative lead screw (24) away from the horizontal servo motor (21) is supported and limited by the first fixed seat (27).

6. The one-time forming M-shaped pipe bending device according to claim 1, characterized in that: The shapes of the second pressure roller (25), the pressure block (28) and the first pressure roller (16) are adapted to the shape of the guide tube to be bent.

7. The one-time forming M-shaped pipe bending device according to claim 2, characterized in that, The top block mechanism (1) further includes: a pressure plate (15); The top block (14) is provided with pressure plates (15) at both ends along the direction of movement of the top block (14) perpendicular to the direction of movement of the top block (14). The top block (14) is slidably connected to the pressure plates (15) and is limited in the direction of movement of the top block (14) by the pressure plates (15).

8. The one-time forming M-shaped pipe bending device according to claim 1, characterized in that: The rotating frame (26) is provided with a keyway, and the lead screw slider (23) is provided with a key. The key is installed in the keyway and allows sliding and rotation along the keyway.

9. An installation method for the one-time forming M-shaped pipe bending device according to any one of claims 1-8, characterized in that, include: The top block mechanism (1) includes a vertical servo motor (11), a first coupling (12), a first sliding screw (13), a top block (14), a pressure plate (15), a first pressure roller (16), and a fixing pin (17). The rotating frame mechanism (2) includes a horizontal servo motor (21), a second coupling (22), a lead screw slider (23), a positive and negative lead screw (24), a second pressure roller (25), a rotating frame (26), a first fixed seat (27), a pressure block (28), and a movable top pin (29). The positioning mechanism (3) includes a handwheel (31), a second fixed seat (32), a second sliding screw (33), and a positioning block (34). The installation method of the one-time forming M-shaped pipe bending device includes the following steps: Step S1, install the top block mechanism (1): After the vertical servo motor (11) is connected to the frame (4), it is connected to the first sliding screw (13) through the first coupling (12), the first sliding screw (13) is connected to the top block (14), and the first pressure roller (16) is connected to the bottom of the top block (14) through the fixing pin (17). The two ends of the top block (14) in the vertical movement direction are pressed on the frame (4) by the pressure plate (15); Step S2, install the rotating frame mechanism (2): After connecting the horizontal servo motor (21) to the frame (4), connect it to the positive and negative lead screw (24) through the second coupling (22). The other end of the positive and negative lead screw (24) is connected to the frame (4) through the first fixed seat (27). Two lead screw sliders (23) are respectively installed at both ends of the positive and negative lead screw (24). The lead screw sliders (23) are connected to the keyway of the rotating frame (26) through a key. The rotating frame (26) and the second pressure roller (25) are installed on the rotating frame mounting seat (41) of the frame (4). A movable top pin (29) is installed on the rotating frame (26). A pressure block (28) is installed between the movable top pin (29) and the guide tube to be bent. The guide tube to be bent is placed between the second pressure roller (25) and the pressure block (28). Step S3, install the positioning mechanism (3): connect the handwheel (31) to the second sliding screw (33), the second sliding screw (33) is connected inside the positioning block (34), and then connect the second sliding screw (33) to the frame (4) by the second fixed seat (32).

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