Pipe bending machine head, pipe bending die head and die head anti-rotation structure

Abstract

This utility model relates to pipe processing equipment, and more particularly to a pipe bending machine head, a pipe bending die, and a die anti-rotation structure. A pipe bending machine head includes a mounting plate fixed to the machine body. A rotating seat rotatable in the vertical direction is fixed to the mounting plate via a horizontal plate. A die is fixed on the rotating shaft of the rotating seat. The side wall of the die has a limiting groove for pipe bending. A movable rotating arm is mounted on the rotating shaft, and a pressure head movable up, down, forward, and backward is mounted on the rotating arm. The surface of the pressure head has a concave pressure head limiting groove, allowing the pressure head to contact the die. The pipe bending machine head is fixedly connected to the machine body via the mounting plate. A horizontal plate is provided above the mounting plate to support the rotating seat rotatable in the vertical direction. The die with the pipe limiting groove is fixedly mounted on the rotating shaft of the rotating seat. A movable rotating arm is also mounted on the rotating shaft. A pressure head with a pressure head limiting groove and movable up, down, forward, and backward is mounted at the end of the rotating arm. During operation, the pressure head contacts and cooperates with the die to complete the pipe bending operation.

Description

Technical Field

[0001] This utility model relates to pipe processing equipment, and in particular to a pipe bending machine head, a pipe bending die head, and a die head anti-rotation structure. Background Technology

[0002] Traditional pipe bending machine heads have the following technical defects when processing pipes with complex angles:

[0003] Limitations of die head adjustment: Most existing dies are fixedly installed. Changing to different diameter pipes requires disassembling the entire module, which is inefficient. In addition, the rotating shaft lacks a quick positioning structure, which causes the bending accuracy to be affected by the assembly gap.

[0004] Insufficient adaptability of the pressure head: Conventional pressure heads have their stroke fixed by bolts, making it difficult to dynamically adapt to the bending pressure of different pipe diameters, which can easily cause indentation or springback in the pipe.

[0005] Lack of coordinated control: The linkage between the rotating arm and the lifting mechanism relies on manual adjustment, which makes it impossible to achieve synchronous closed-loop adjustment of the pressure head position and the clamping force. This is especially prone to wrinkling and deformation in small-radius bends.

[0006] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a pipe bending machine head that would have greater industrial application value. Utility Model Content

[0007] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a pipe bending machine head, a pipe bending die head, and a die head anti-rotation structure.

[0008] This utility model discloses a pipe bending machine head, including a mounting plate fixed to the pipe bending machine body. A rotating seat that can rotate in the vertical direction is fixed on the mounting plate by a horizontal plate. A die head is fixed on the rotating shaft of the rotating seat. The side wall of the die head has a limiting groove for bending the pipe. A rotating arm that can follow the rotation is mounted on the rotating shaft. A pressure head that can move up and down and back and forth is mounted on the rotating arm. The surface of the pressure head has a concave pressure head limiting groove. The pressure head can contact the die head.

[0009] The head of the pipe bending machine is fixedly connected to the machine body via a mounting plate. A horizontal plate is set above the mounting plate to support a rotating seat that can rotate in the vertical direction. A die head with a pipe limiting groove is fixedly installed on the rotating shaft of the rotating seat. At the same time, a rotating arm that can follow the rotation is mounted on the rotating shaft. A pressure head with a pressure head limiting groove and that can move up, down, back and forth is installed at the end of the rotating arm. During operation, the pressure head completes the pipe bending operation by contacting and cooperating with the die head.

[0010] Furthermore, the rotating arm has a groove with multiple synchronous lifting parts for moving the lifting platform up and down, and a translation part is installed at the upper end of the lifting platform, which drives the pressure head to move horizontally.

[0011] The rotating arm has a groove inside and multiple synchronous lifting parts are installed. The lifting platform is driven by the synchronous lifting parts to move up and down. A translation part is fixed above the lifting platform. The translation part is connected to the pressure head and drives the pressure head to move horizontally to adapt to different pipe bending requirements.

[0012] Furthermore, the upper surface of the lifting platform has a guide section, and the pressure head is installed on the guide section.

[0013] The pressure head is mounted on the guide section on the surface of the lifting platform. This design ensures that the pressure head slides smoothly back and forth, ensuring that it can be accurately aligned with the position of the die head for pipe bending operations each time.

[0014] Furthermore, a rotating base is fixed on the rotating shaft of the rotating seat, and a mold head passing through the rotating shaft is placed on the rotating base. A clamping nut is screwed into the upper end of the rotating shaft to press the mold head onto the rotating base.

[0015] The rotating shaft of the rotating seat is fixedly connected to the rotating base. The die head is installed on the rotating base through the rotating shaft. The die head and the rotating base are reliably clamped and fixed by screwing in the clamping nut at the upper end of the rotating shaft, ensuring the positioning accuracy and structural stability of the die head during pipe bending operations.

[0016] Furthermore, there is a column on one side of the horizontal plate located at the mold head, and a horizontally placed extension block on the column extending towards the mold head. A guide block that contacts the mold head is fixed on the extension block, and the surface of the guide block has a recessed guide limiting groove.

[0017] A column is provided on the side of the horizontal plate near the die head. The column extends laterally toward the die head and an extension block is fixedly installed at the end of the extension block to contact and cooperate with the die head. A concave guide and limiting groove is machined on the working surface of the guide block for guiding the pipe and assisting in positioning.

[0018] Furthermore, a support plate is fixed on the side wall of the mounting plate. The end of the support plate has an electric lead screw parallel to the rotating arm in the initial state. The screw of the electric lead screw is engaged with the screw hole on the side wall of the clamping seat. The clamping seat fixes the clamping block on the end face close to the guide block. The end face of the clamping block has a clamping limit groove.

[0019] A support plate is fixed to the side wall of the mounting plate. An electric screw is installed at the end of the support plate, which is parallel to the rotating arm in the initial state. The screw of the electric screw is threaded into the screw hole on the side wall of the clamping seat. A clamping block is installed on the end face of the clamping seat near the guide block. The end of the clamping block is provided with a clamping limiting groove that matches the tube for forming positioning.

[0020] Furthermore, a telescopic part is installed on one side of the top clamping seat. The telescopic rod of the telescopic part passes through the top clamping seat and is fixedly connected to a connecting block. The other end of the connecting block is fixedly connected to the sliding plate. The sliding plate and the top clamping seat are movably installed through a linear guide mechanism. A top clamping block is fixed on the end face of the sliding plate.

[0021] The side of the clamping seat is equipped with a telescopic part. The telescopic rod of the telescopic part passes through the clamping seat and is rigidly connected to the connecting block. The other end of the connecting block is fixedly connected to the sliding plate. The sliding plate forms a sliding fit with the clamping seat through a linear guide mechanism. The clamping block installed at the end of the sliding plate achieves linear displacement with the movement of the cylinder, thus completing the positioning and clamping function of the pipe.

[0022] Furthermore, a lifting cylinder is fixed to the bottom end face of the pipe bending machine body. The telescopic rod of the lifting cylinder is connected to the support seat at the bottom of the mounting plate. The mounting plate and the pipe bending machine body are installed in a movable manner through a linear guide mechanism.

[0023] A lifting cylinder is fixedly installed at the bottom of the end face of the pipe bending machine. The telescopic rod of the lifting cylinder is rigidly connected to the bottom support of the mounting plate. The mounting plate is slidably engaged with the pipe bending machine body through a precision linear guide mechanism, so that the entire mounting plate can be smoothly raised and lowered in the vertical direction under the drive of the lifting cylinder, realizing the height adjustment function in the pipe processing process.

[0024] A type of anti-rotation structure for a pipe bending machine head has a horizontally placed anti-rotation protrusion on the upper surface of the rotating base, and a groove at the bottom of the die head that is engaged with the anti-rotation protrusion.

[0025] The anti-rotation protrusion of the rotating base cooperates with the groove at the bottom of the die head to achieve circumferential positioning and prevent the die head from rotating.

[0026] A pipe bending die head for a pipe bending machine head, the die head is divided into an upper die and a lower die, the upper die and the lower die are circumferentially fixed by a positioning part.

[0027] The die head consists of an upper die and a lower die. Both the upper and lower die surfaces are provided with limiting grooves for bending the pipe. The contact surfaces are provided with corresponding recessed positioning grooves. The positioning part enables precise alignment and fixed assembly of the upper and lower dies.

[0028] By means of the above-described solution, the present invention has at least the following advantages: The split mold head, combined with the positioning part, enables quick replacement and precise positioning, eliminating the impact of assembly gaps on rotational accuracy. The pressure head is driven by the synchronous lifting part to achieve vertical displacement of the lifting platform, and the horizontal movement is controlled by the translation part. Combined with the guide groove design, it can adapt to the bending of different pipe diameters. The pressure head presses the pipe and rotates with the rotating arm. The pressure head continuously provides clamping force to effectively prevent the pipe from springing back. The electric screw precisely adjusts the position of the clamping seat, and together with the telescopic part, it drives the sliding plate to move the clamping block to form a stable clamping environment. The forward movement of the sliding plate ensures that the clamping block and the side wall of the pipe bending position are in a static relationship, avoiding hard friction between the pipe and the clamping block, which could damage the side wall of the pipe. The lifting cylinder controls the overall lifting and lowering of the mounting plate via a linear guide mechanism, enabling coordinated movement of the rotating arm, pressure head, and clamping block. Different mold limit slots can be selected as needed to meet the requirements of different bending radii, completely solving the problem of wrinkling and deformation in small-radius bends and significantly improving bending accuracy and production efficiency.

[0029] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the utility model Figure 1 Another perspective illustration; Figure 3 This is the utility model Figure 1 Enlarged view of region A in the middle; Figure 4 This is the utility model Figure 2 A magnified view of region B in the middle.

[0032] In the diagram: 1. Mounting plate; 2. Rotating seat; 3. Die head; 4. Horizontal plate; 5. Rotating arm; 6. Press head; 7. Lifting platform; 8. Synchronous lifting part; 9. Translation part; 10. Rotating base; 11. Anti-rotation protrusion; 12. Upper die; 13. Lower die; 14. Positioning part; 15. Column; 16. Guide block; 17. Support plate; 18. Electric lead screw; 19. Tightening seat; 20. Telescopic part; 21. Connecting block; 22. Sliding plate; 23. Tightening block; 24. Lifting cylinder; 25. Support seat. Detailed Implementation

[0033] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0034] See Figure 1 and Figure 2The pipe bending machine head is fixedly connected to the machine body via mounting plate 1. A horizontal plate 4 supports a rotating base 2 that can rotate vertically. The rotating shaft of the rotating base 2 is fixed to a die head 3 with a pipe limiting groove. A movable rotating arm 5 is also assembled (the rotation direction of the rotating arm 5 is as follows...). Figure 1 (As shown by the arrow in the middle arc), a pressure head 6 with a pressure head limiting groove and multi-directional adjustment is installed at the end of the rotating arm 5 (this pressure head 6 can be adjusted in multiple directions). Figure 1 The pressure head 6 feeds forward and backward along the Y-axis and moves up and down along the X-axis (it can also rotate with the rotating arm 5). During operation, the pressure head 6 moves up and down and forward and backward in precise coordination with the die head 3 to complete the pipe bending operation. The synchronous rotation of the rotating seat 2 and the rotating arm 5 ensures the consistency of the bending angle. The multi-degree-of-freedom adjustment of the pressure head 6 adapts to different pipe diameters and bending arcs. The limiting groove of the die head 3 and the limiting groove of the pressure head 6 form a double positioning, effectively preventing the pipe from sliding and deforming. The overall structure is compact and the movements are coordinated, significantly improving the pipe bending accuracy and process adaptability.

[0035] See Figure 1 The rotating arm 5 has a groove inside and multiple synchronous lifting parts 8 are installed. The synchronous lifting parts 8 drive the lifting platform 7 to achieve precise vertical displacement. Figure 1 (In the Y-axis direction), a translation part 9 is fixed above the lifting platform 7 to drive the pressure head 6 to move horizontally. Multiple sets of synchronous lifting parts 8 ensure that the lifting platform 7 is stable and without deviation during the lifting process. The translation part 9 and the pressure head 6 work together to achieve precise adjustment of the horizontal position, so that the pressure head 6 can accurately fit onto the mold head 3.

[0036] The synchronous lifting unit 8 and the translation unit 9 can be selected from, but are not limited to, cylinders, hydraulic cylinders and electric lead screws, depending on the requirements.

[0037] See Figure 1 The lifting platform 7 has a guide section, and the pressure head 6 is installed on the guide section. The guide section structure provides a stable horizontal movement track for the pressure head 6. Figure 1 (in the Y-axis direction), effectively eliminating radial offset of the pressure head 6 during operation, ensuring that the contact position between the pressure head 6 and the die head 3 remains precisely aligned. This rigid guide design significantly improves the repeatability and reliability of the pipe bending operation.

[0038] The guide section includes, but is not limited to, structures such as guide grooves, slide rails and sliders, guide rods and guide sleeves.

[0039] See Figure 3The rotating base 10 is fixed to the rotating shaft of the rotating seat 2. The die head 3 passes through the rotating shaft and is placed on the rotating base 10. The die head 3 is firmly pressed by the clamping nut at the upper end of the rotating shaft. The rotating base 10 provides a stable support platform for the die head 3. The clamping nut realizes the quick clamping and axial positioning of the die head 3. This structure not only ensures the coaxial accuracy of the die head 3 and the rotating shaft, but also facilitates the quick replacement of the die head 3 according to different pipe specifications. It has strong overall rigidity and is easy to disassemble and assemble, which significantly improves the versatility and operation efficiency of the pipe bending die system.

[0040] The upper surface of the rotating base 10 is provided with a horizontal anti-rotation protrusion 11, and the bottom of the die head 3 is machined with a positioning groove that matches the anti-rotation protrusion 11. The fitting structure of the anti-rotation protrusion 11 and the groove of the die head 3 forms a mechanical anti-foolproof design, which ensures that the circumferential angle is automatically corrected when the die head 3 is installed, eliminating manual alignment errors. At the same time, the convex and concave fit can withstand the torsional torque during the bending operation, preventing the die head 3 from sliding relative to each other during rotation, and greatly improving the consistency of the bending angle and the torsional stability of the mold system.

[0041] The anti-rotation protrusion 11 includes, but is not limited to, keyways, limiting protrusions, splines, and other structures.

[0042] See Figure 3 The die head 3 of this pipe bending machine adopts a split design of upper die 12 and lower die 13. Both the upper and lower die surfaces are provided with pipe bending limiting grooves. The contact surfaces of the upper die 12 and lower die 13 are machined with matching concave positioning grooves and are precisely connected through positioning part 14. The split structure makes it more convenient to load and unload pipes. The cooperation between the positioning groove and the positioning part 14 ensures that the coaxiality error of the upper die 12 and lower die 13 when closed is less than 0.05mm. The double-sided constraint of the limiting groove effectively prevents axial movement or surface damage of the pipe during bending. The overall curvature of the limiting groove on the surface of the upper die 12 and lower die 13 is different, which is used to bend the pipe to different radii, increasing the applicability of the die head 3. Different upper dies 12 and lower dies 13 can be selected according to the bending requirements of the pipe to form different dies 3, which can meet the bending requirements of pipes of different sizes.

[0043] The positioning part 14 includes, but is not limited to, structures such as pins, clips, and connecting flanges.

[0044] The pipe bending limiting grooves on the surfaces of the upper mold 12 and the lower mold 13 are configured with different curvatures according to the pipe bending requirements.

[0045] A column 15 is installed on the horizontal plate 4. Its extension block extends laterally and fixes a guide block 16 with an inwardly recessed guide limiting groove to contact the die head 3. The column 15 and the extension block form a cantilever support structure, so that the limiting groove of the guide block 16 and the die head 3 form a precise pipe guide channel, effectively constraining the movement trajectory of the pipe in the initial stage of bending, preventing radial deviation or warping deformation of the pipe when bending. At the same time, the detachable design of the guide block 16 makes it easy to replace the corresponding groove type accessories according to the pipe diameter, meeting the bending requirements of pipes of different sizes.

[0046] See Figure 2 and Figure 4 A support plate 17 is added to the side wall of the mounting plate 1, and an electric screw 18 parallel to the initial state of the rotating arm 5 is installed at its end. The screw drives the screw to engage with the screw hole of the clamping seat 19, so that the clamping block 23 fixed at the front end of the clamping seat 19 and its limiting groove can be axially adjusted. The electric screw 18 provides precision feed, so that the limiting groove of the clamping block 23 and the guide block 16 form a dynamic clamping system, which can gradually clamp the pipe to prevent springback when bending the pipe.

[0047] See Figure 4 By adding a telescopic part 20 to the side of the top clamping seat 19, the telescopic rod passes through the top clamping seat 19 and is linked to the sliding plate 22 through the connecting block 21. The linear guide mechanism ensures that the sliding plate 22 drives the top clamping block 23 to move linearly. The telescopic part 20 provides the moving power for the sliding plate 22. The linear guide mechanism structure makes the top clamping block 23 maintain a stable linear motion trajectory during the pipe bending process. During the bending operation, the outer wall of the pipe will undergo tensile deformation. The top clamping block 23 follows the bending operation and is driven by the telescopic part 20 to follow the bending deformation of the pipe, continuously providing a limit for the bent pipe, avoiding hard friction between the outer wall of the pipe and the top clamping block 23, and keeping the side wall of the pipe intact.

[0048] The telescopic part 20 includes, but is not limited to, structures such as cylinders, hydraulic cylinders, electric lead screw pairs, and linear electric modules.

[0049] See Figure 1 and Figure 2 A lifting cylinder 24 is configured at the bottom of the end face of the machine body. Its telescopic rod drives the mounting plate 1 to rise and fall through the support seat 25. The linear guide mechanism ensures that the mounting plate 1 moves accurately in the vertical direction. The lifting cylinder 24 provides lifting force to the mounting plate 1. It works with the linear slide rail to achieve precise movement guidance. The initial engagement height between the die head 3 and the rotating arm 5 can be quickly adjusted to adapt to different bending radius requirements. Different bending radii can be selected on the die head 3 to meet the bending requirements of pipes of different sizes.

[0050] Linear guiding mechanisms include, but are not limited to, slide rail and slider structures, guide groove and guide block structures, and ball raceway structures.

[0051] The working principle of this utility model is as follows: During the bending operation, the pipe to be bent is aligned with a set of limiting grooves on the die head 3 and guide block 16. Then, the synchronous lifting part 8, the translation part 9, and the electric lead screw 18 are activated to drive the pressure head 6 and the clamping block 23 to press against the pipe, completing the pipe positioning. At this time, the motor inside the rotating seat 2 is activated, driving the die head 3 and the rotating arm 5 to rotate synchronously. Simultaneously, following the deformation generated during pipe bending, the clamping block 23 also moves forward synchronously under the drive of the telescopic part 20. Figure 1 (In the X-axis direction), it compensates for the deformation caused by pipe bending, avoids hard friction between the outer wall of the pipe and the clamping block 23 during bending, protects the side wall of the pipe, and after bending to the correct position, the pressure head 6 and the clamping block 23 are reset, the pipe is released, and a bending angle is completed for the pipe.

[0052] Subsequently, the pipe is rotated and fed by the rotary feeding mechanism configured on the pipe bending machine, which moves the subsequent bending part of the pipe into place. As needed, the lifting cylinder 24 can be activated to drive the entire die head 3, pressure head 6, clamping block 23 and guide block 16 to adjust their height synchronously, so as to select the limit grooves of different bending radii on the die head 3. Repeat the mechanical operation of the previous bending angle, and the subsequent pipe bending can be completed.

[0053] This process is repeated until the bending of the long strip of pipe is completely completed.

[0054] There is a downward-bent guide section between the rotation of the rotating arm 5 and the rotating seat 2 to avoid mechanical interference when the lifting platform 7 moves up, down, back and forth.

[0055] There is a pipe feeding mechanism on one side of the head of this pipe bending machine. This mechanism can drive the pipe to perform clamping, feeding and rotation operations, and work with this device to meet the need for continuous bending of the pipe.

[0056] A locking structure can be set on each synchronous lifting part 8, translation part 9, telescopic part 20 and the corresponding linear guide mechanism to lock and limit the movement mechanism, so as to avoid overshooting of each mechanism and damage to the mechanism.

[0057] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pipe bending machine head, comprising a mounting plate (1) fixed to the pipe bending machine body, characterized in that: A rotating seat (2) that can rotate vertically is fixed on the mounting plate (1) via a horizontal plate (4). A die head (3) is fixed on the rotating shaft of the rotating seat (2). The side wall of the die head (3) has a limiting groove for bending the pipe. A rotating arm (5) that can follow the rotation is installed on the rotating shaft. A pressure head (6) that can move up and down and back and forth is installed on the rotating arm (5). The surface of the pressure head (6) has a concave pressure head limiting groove. The pressure head (6) can contact the die head (3).

2. The pipe bending machine head according to claim 1, characterized in that: The rotating arm (5) has a groove with multiple synchronous lifting parts (8) for the lifting platform (7) to move up and down. The upper end of the lifting platform (7) is equipped with a translation part (9), which drives the pressure head (6) to move horizontally.

3. The pipe bending machine head according to claim 2, characterized in that: The upper surface of the lifting platform (7) has a guide section, and the pressure head (6) is installed on the guide section.

4. A pipe bending machine head according to any one of claims 1-3, characterized in that: A rotating base (10) is fixed on the rotating shaft of the rotating seat (2). A mold head (3) passing through the rotating shaft is placed on the rotating base (10). A clamping nut is screwed into the upper end of the rotating shaft to press the mold head (3) onto the rotating base (10).

5. The pipe bending machine head according to claim 4, characterized in that: On the horizontal plate (4), there is a column (15) on one side of the mold head (3). The column (15) has a horizontally placed extension block on the side of the mold head (3). A guide block (16) that contacts the mold head (3) is fixed on the extension block. The surface of the guide block (16) has a concave guide limiting groove.

6. The pipe bending machine head according to claim 5, characterized in that: A support plate (17) is also fixed on the side wall of the mounting plate (1). The end of the support plate (17) is connected to an electric screw (18). The screw of the electric screw (18) drives the clamping seat (19) to move axially. The clamping seat (19) fixes the clamping block (23) on the end face close to the guide block (16). The end face of the clamping block (23) has a clamping limit groove.

7. A pipe bending machine head according to claim 6, characterized in that: A telescopic part (20) is installed on one side of the top clamping seat (19). The telescopic rod of the telescopic part (20) passes through the top clamping seat (19) and is fixedly connected to a connecting block (21). The other end of the connecting block (21) is fixedly connected to the sliding plate (22). The sliding plate (22) and the top clamping seat (19) are movably installed through a linear guide mechanism. A top clamping block (23) is fixed on the end face of the sliding plate (22).

8. A pipe bending machine head according to claim 7, characterized in that: A lifting cylinder (24) is fixed at the bottom end face of the pipe bending machine body. The telescopic rod of the lifting cylinder (24) is connected to the support seat (25) at the bottom of the mounting plate (1). The mounting plate (1) and the pipe bending machine body are installed in a movable manner through a linear guide mechanism.

9. A die head anti-rotation structure for a pipe bending machine head according to any one of claims 1-8, characterized in that: The upper surface of the rotating base (10) has a horizontally placed anti-rotation protrusion (11), and the bottom of the mold head (3) has a groove that is locked on the anti-rotation protrusion (11).

10. A pipe bending die head for a pipe bending machine according to any one of claims 1-8, characterized in that: The mold head (3) is divided into an upper mold (12) and a lower mold (13). The upper mold (12) and the lower mold (13) are circumferentially fixed through the positioning part (14).

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