A metal pipe bending device

Abstract

The application provides a metal pipe bending device, and relates to the technical field of pipe bending machines. The device is used for bending processing of a pipe fitting, and specifically comprises the following: a rack; a first pipe clamping module connected to the rack, the first pipe clamping module comprising a first clamping part used for clamping the pipe fitting; a second pipe clamping module rotatably connected to the rack, the second pipe clamping module comprising a second clamping part, and the second pipe clamping module being configured to drive the pipe fitting clamped by the second clamping part to bend during rotation; and a protection piece connected to the first pipe clamping module and the second pipe clamping module, the protection piece being configured to abut at least a part of an area on the outside of the pipe fitting during rotation of the second pipe clamping module. The metal pipe automatic bending device provided in the application can constrain the irregular deformation of the outer side surface of the pipe fitting during bending operation, thereby improving the quality of the final product.

Description

Technical Field

[0001] This application relates to the field of pipe bending machine technology, specifically to a metal pipe bending device. Background Technology

[0002] A pipe bending machine is a mechanical device used to bend metal pipes into specific angles or shapes. It is widely used in industries such as automotive, aerospace, furniture, and environmental protection equipment. Pipe bending machines can be classified by their drive method as manual or automatic. Automatic pipe bending machines operate via hydraulic or electric drives. A typical pipe bending machine includes a frame and a bending and mandrel-pulling device mounted on the frame. The bending device includes a bending mechanism and associated clamping dies, guide dies, bending dies (wheel dies), and anti-wrinkle dies. The mandrel-pulling device generally includes a mandrel for internal support of the pipe and a mandrel-pulling cylinder connected to the mandrel. After the workpiece is placed into the die, the power system drives the bending mechanism to rotate the pipe around the bending die to form the desired angle. The mandrel then withdraws from the bending section, completing one bending cycle.

[0003] When pipes are bent, the outer side of the pipe at the bend is stretched, which can easily cause irregular deformation on the surface of this area, resulting in the final product not meeting the requirements. Utility Model Content

[0004] This application provides a metal pipe bending device that can effectively solve the above-mentioned problems.

[0005] The specific technical solution of this embodiment is as follows:

[0006] This application provides a metal pipe bending device for bending pipe fittings, comprising: a frame; a first pipe clamping module connected to the frame, the first pipe clamping module including a first clamping part for clamping the pipe fitting; a second pipe clamping module rotatably connected to the frame, the second pipe clamping module including a second clamping part, the second pipe clamping module being configured to bend the pipe fitting it clamps through the second clamping part during rotation; and a protective member connected to the first pipe clamping module and the second pipe clamping module, the protective member being configured to abut against at least a portion of the outer side of the bent pipe fitting during the rotation of the second pipe clamping module.

[0007] In some embodiments, the protective member includes a flexible plate with its opposite ends connected to a first clamping module and a second clamping module, respectively. During the rotation of the second clamping module, the flexible plate abuts against at least a portion of the outer side of the bent pipe member.

[0008] In some embodiments, the first clamping module has a through groove on one side edge near the second clamping module, and the flexible plate is telescopic and at least partially located within the through groove.

[0009] In some embodiments, the second clamping tube module is provided with a first connector, and the flexible plate is provided with a second connector on the side near the second clamping tube module. The first connector and the second connector cooperate with each other to achieve a detachable connection between the flexible plate and the second clamping tube.

[0010] In some embodiments, the first clamping module has a first receiving groove, the second clamping module has a second receiving groove, and when the second clamping module and the first clamping module are in a fitted state, the first receiving groove and the second receiving groove form a continuous groove.

[0011] In some embodiments, the width of the first receiving groove is a, and the size of the protective member is b along the direction of the width of the first receiving groove, where a≤b.

[0012] In some embodiments, the first receiving groove and / or the second receiving groove are arc-shaped grooves.

[0013] In some embodiments, the second clamping module is connected to the frame via a wheel mold, and the swing center of the second clamping module coincides with the swing center of the wheel mold.

[0014] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0015] The automatic pipe bending device for metal pipes provided in this application embodiment has a protective component that abuts against at least a portion of the outer side of the pipe during bending operations, thereby constraining the irregular deformation of the outer surface of the pipe and improving the quality of the final product. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a top view of the structure of this application;

[0018] Figure 2 This is a schematic diagram of the mandrel mechanism;

[0019] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0020] Figure 4 for Figure 3 BB-direction view of the central support plate;

[0021] Figure 5 This is a structural diagram of one side of the variable diameter fastener;

[0022] Figure 6 This is a structural diagram of the other side of the reducing buckle;

[0023] Figure 7 This is a schematic diagram of the structure of an automatic metal pipe bending device according to other embodiments of this application;

[0024] Figure 8 for Figure 7 Schematic diagrams of the automatic pipe bending device for metal pipes under different conditions.

[0025] in:

[0026] 0. Pipe fittings; 1. Frame; 2. Bending area; 3. Swing frame; 4. Wheel mold; 5. Press mold; 6. First clamping module; 7. Anti-wrinkle mold; 8. Second clamping module; 9. Guide mold; 10. Third clamping module; 11. Bending station; 12. Mandrel mechanism; 13. Variable diameter rod head; 14. Rod body; 15. Rotary joint; 16. Core-pulling cylinder; 17. Support plate; 18. Support body; 19. Connector; 20. Support ring surface; 21. Disc body; 22. Inner groove; 23. Center column; 24. Connecting boss; 25. Guide channel; 26. Limiting pin; 27. Variable diameter fastener; 28. Shoulder; 29. ​​Pressure ring; 30. Annular groove; 31. Protruding column; 32. Support arm; 33. Rotating block; 34. Rubber cone rod; 35. Rotating sleeve; 36. Shaft seat; 37. Driven wheel; 38. Drive motor; 39. Driving wheel; 40. Transmission belt; 41. Protective component. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0030] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0031] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0032] like Figure 1As shown, this application discloses an automatic metal pipe bending device. Similar to a traditional pipe bending machine, it also includes a frame 1, which serves as the mounting foundation and support platform. The frame 1 is typically a steel structure platform with a tabletop on top. A bending area 2 is located at one end of the frame 1, serving as the main area for pipe bending operations. A swing frame 3, driven by a bending drive mechanism, is installed in the bending area 2 and forms a swing connection with the frame 1. The bending drive mechanism can generally be a hydraulic or electric drive structure, enabling the swing frame 3 to swing automatically.

[0033] like Figure 1 As shown, the main structure within the pipe bending area 2 includes a wheel mold 4 mounted on one side of the top of the swing frame 3, with the swing center of the swing frame 3 coinciding with the wheel mold 4. A first clamping module 6 for mounting a pressure mold 5 is mounted on the top of the other side of the swing frame 3. The first clamping module 6 can drive the pressure mold 5 forward and backward, thereby achieving mold closing with the wheel mold 4. A second clamping module 8 for mounting an anti-wrinkle mold 7 is mounted on the frame 1 on one side of the wheel mold 4. The second clamping module 8 typically has a fine-tuning function for the anti-wrinkle mold 7 to ensure the accuracy of its position. A third clamping module 10 for mounting a guide mold 9 is mounted on the top of the frame 1 opposite the second clamping module 8. The third clamping module 10 can move forward and backward as a whole, driving the guide mold 9 to close with the anti-wrinkle mold 7. Simultaneously, during the pipe bending process, the guide mold 9 can follow the movement under the drive of a cylinder, thus guiding the pipe fitting 0. The anti-wrinkle mold 7 and the guide mold 9, and the pressure mold 5 and the wheel mold 4 together constitute the pipe bending station 11, as shown in the diagram. Figure 1 As shown, the pipe fitting 0 enters the bending station 11 from the right end of the frame 1. A mandrel mechanism 12 extending along the length of the frame 1 is provided at the top of the frame 1 opposite to the bending station 11. The mandrel mechanism 12 can provide internal support for the inside of the pipe fitting 0.

[0034] Besides the layout of the bending zone 2 described above, the biggest difference between this application and existing pipe bending machines is that the mandrel mechanism 12 includes a variable diameter mandrel head 13 located at the bending station 11, which can extend into the pipe fitting 0. The variable diameter mandrel head 13 is a mandrel head with an adjustable outer diameter, which matches pipe fittings 0 with different inner diameter models through diameter adjustment. Figure 1 and 2 As shown, one end of the variable diameter rod head 13 is connected to the rod body 14, and the other end of the rod body 14 is connected to the telescopic end of the core-pulling cylinder 16 via a rotary joint 15. The telescopic movement of the core-pulling cylinder 16 drives the core rod mechanism 12 to... Figure 1 The tube moves in the left and right directions to achieve core removal after the pipe bend is completed (removing the reducing rod head 13 from the bent part of the pipe fitting 0).

[0035] like Figure 3As shown, the variable diameter rod head 13 is composed of multiple support discs 17 arranged along the length of the pipe fitting 0. Each support disc 17 has multiple support bodies 18 that can move radially along the support disc 17. The radial position of the support body 18 on the support disc 17 is adjusted to adapt to the inner diameter of the pipe fitting 0. That is, the outer diameter of the variable diameter rod head 13 is mainly determined by the support disc 17, and the outer diameter of the support disc 17 is mainly determined by the radial position of the support body 18 on the support disc 17. Adjacent support discs 17 are connected by connectors 19 to form a universal joint. This universal joint must ensure the relative degrees of freedom of each support disc 17 while also realizing the transmission of rotational power. Generally, the connector 19 is a cross coupling. The connecting sections of the cross coupling are connected to two adjacent support discs 17 respectively. The connection position is located at the center of the support disc 17, and the specific connection structure can be designed according to the specific structure of the support disc 17. Figure 3 In the embodiment shown, the two ends of the cross coupling can be welded to the end faces of the central column 23 and the connecting boss 24 of the adjacent support plate 17, respectively.

[0036] Since the support surface of the support disk 17 is mainly composed of the outer support bodies 18, to satisfy the radial movement of the support bodies 18, they are multiple independent moving parts, which are not continuous on the circumferential surface. Although the gap between the support bodies 18 and the support bodies 18 in the circumferential direction of the support disk 17 can be reduced by increasing the number of support bodies 18, it is difficult to completely eliminate them. The existence of such gaps may lead to uneven circumferential inward support force on the pipe fitting 0, increasing the risk of local dents or wrinkles. Therefore, in order to cooperate with the above design, the mandrel mechanism 12 of this application also includes a rotary drive assembly for driving the variable diameter rod head 13 to rotate. During the rotation, the multiple support bodies 18 on the support disk 17 can form a support ring surface 20 inside the pipe fitting 0. Figure 4 As shown, the outer dashed line represents the support ring surface 20, which is formed by the rotation of the support body 18 around the center of the support disk 17. Through rapid rotation, a basically continuous support ring surface 20 can be formed on the outside of the support disk 17 during the bending process.

[0037] The overall working principle of this application is as follows: During use, after adjusting the outer diameter of the mandrel mechanism 12's variable diameter rod head 13 according to the size of the pipe fitting 0, the pipe fitting 0 to be processed is installed at the bending station 11 and fitted onto the variable diameter rod head 13. The pressure mold 5 on the first clamping module 6 and the guide mold 9 on the third clamping module 10 approach the wheel mold 4 and the anti-wrinkle mold 7 to clamp the pipe fitting 0. Under the drive of the bending drive mechanism, the swing frame 3 swings, thereby realizing the automatic bending of the pipe fitting 0. The mandrel mechanism 12 of this application has a variable diameter rod head 13 composed of multiple support discs 17. Each support disc 17 can adjust its overall outer diameter by adjusting the radial position of multiple support bodies 18 arranged on its circumference, thereby adapting to the bending of pipe fittings 0 with different diameters. Although the support disc 17 of this application is supported inside the pipe fitting 0 by multiple support bodies 18, the mandrel mechanism 12 can rotate under the drive of the rotary drive assembly. By rotating each independent support body 18, a continuous "support ring surface 20" can be formed, ensuring the support effect. At the same time, because the variable diameter rod head 13 can rotate quickly, it can help to flatten the inner cavity of the pipe fitting 0, reducing the risk of wrinkles and collapse after bending. On the other hand, the rapid rotation of the variable diameter rod head 13 transforms the static friction with the inside of the pipe fitting 0 into dynamic friction compared to traditional mandrels, which can also achieve rapid core pulling and reduce the risk of mandrel jamming. After the pipe is bent, the core-pulling cylinder 16 retracts to pull the mandrel mechanism 12 out of the bent part of the pipe fitting 0, completing one processing cycle.

[0038] Regarding the specific structure of the support plate 17, there are many forms. Any structure that involves multiple support bodies 18 mounted on the support plate 17 and provides internal support through rotation falls within the scope of protection of this application. For example: Figure 3 and 4 As shown, the support plate 17 includes a plate body 21. One side of the plate body 21 has an inner groove 22, and a central post 23 is located at the center of the inner groove 22. The other side of the plate body 21 has a connecting boss 24. A guide channel 25 is provided on the groove wall around the inner groove 22, penetrating the inner and outer sides of the plate body 21. The inner end of the support body 18 is inserted into the guide channel 25 and forms a radial sliding fit with the guide channel 25 along the plate body 21. The support body 18 can be a teardrop-shaped component made of copper alloy, with a larger outer end and a smaller inner end. The outer end face forms a support surface, and the inner end can be adjusted radially by sliding within the guide channel 25. Alternatively, the support body 18 can include a support arm 32 and a rotating block 33 located at the outer end of the support arm 32, forming a rotatable fit with the support arm 32. In this case, the rotating block 33 is made of copper alloy. In this form, by utilizing the rotation of the rotating block 33, the sliding friction with the inner wall of the pipe fitting can be further transformed into rolling friction, reducing friction and improving the overall rotatability of the support plate 17.

[0039] Regarding the locking of the support 18, one embodiment of this application may be as follows: Figure 3 As shown, the inner end of the support body 18 (support arm 32) is provided with a limiting pin 26 parallel to the central column 23. The support plate 17 also includes a variable diameter fastener 27 sleeved outside the central column 23 and adapted to the inner groove 22. The edge of the variable diameter fastener 27 is provided with a shoulder 28. The variable diameter fastener 27 is pressed into the inner groove 22 by a pressure ring 29 provided at the shoulder 28, and the pressure ring 29 is threadedly connected to the inner groove 22. The side of the variable diameter fastener 27 facing the inner groove 22 is provided with an annular groove 30 that cooperates with the limiting pin 26. The limiting pin 26 is engaged in the annular groove 30 to form a radial limit for the support body 18. By replacing the variable diameter fastener 27, the radial position of the support body 18 can be adjusted by changing the annular groove 30 on the variable diameter fastener 27. In other words, the support 18 of this application is radially limited by a limiting pin 26 located at its inner end, which engages with the annular groove 30 of the variable diameter fastener 27. The variable diameter fastener 27 is installed in the inner groove 22 and is pressed together by a pressure ring 29. Multiple variable diameter fasteners 27 can be provided as needed, or they can be temporarily machined according to usage requirements. Its structure is simple, and high-precision machining can be achieved through ordinary turning.

[0040] Considering that the pressure ring 29 and the inner groove 22 are threadedly connected, and the mandrel mechanism 12 needs to rotate rapidly, to prevent the pressure ring 29 from dislodging from the inner groove 22 after long-term rotation, the threaded connection between the pressure ring 29 and the inner groove 22 is reversed relative to the rotation direction of the mandrel mechanism 12, so that the rotation of the mandrel mechanism 12 will not cause the threads to loosen. Based on this, to facilitate assembly, the reducing buckle 27 of this application is composed of two halves of a seat, and a protrusion 31 for a screwing tool is provided on the outward-facing side of the pressure ring 29. To improve the centering and pressing of the pressure ring 29 onto the reducing buckle 27, the stepped surface of the shoulder 28 of the reducing buckle 27 is inclined, and the inner surface of the pressure ring 29 is also inclined, with the inclination angle matching that of the shoulder 28. Considering the convenience of inserting the mandrel mechanism 12 into the pipe fitting, a rubber cone rod 34 can also be provided on the central post 23 of the support plate 17 at the end of the reducing rod head 13.

[0041] Regarding the rotational drive form of the mandrel mechanism 12 in this application, as follows: Figure 1 As shown, a simpler embodiment includes a rotary drive assembly comprising a rotary sleeve 35 mounted on a frame 1, with both ends and the middle portion of the rotary sleeve 35 mounted on the frame 1 via bearings 36. The rotary sleeve 35 has an inner hole at its center through which the rod 14 of the mandrel mechanism 12 passes. The rod 14 and the inner hole form a sliding fit along the length of the rotary sleeve 35 and a transmission fit along the circumference of the rotary sleeve 35. The section of the mandrel located within the rotary sleeve 35 and the cross-section of the inner hole of the rotary sleeve 35 form mutually fitting regular hexagons.

[0042] A driven wheel 37 is provided on the circumferential surface of the middle section of the rotating sleeve 35, and a drive motor 38 is provided on one side of the rotating sleeve 35. The output end of the drive motor 38 is connected to the driving wheel 39. The driving wheel 39 is connected to the driven wheel 37 through a transmission belt 40.

[0043] Please continue reading for more details. Figure 7 and Figure 8 The metal pipe bending device bends pipe fitting 0. A first clamping module 6 is connected to a frame 1 and includes a first clamping part for clamping pipe fitting 0. A second clamping module 8 is rotatably connected to the frame 1 and includes a second clamping part. The second clamping module 8 is configured to bend the clamped pipe fitting 0 during rotation via the second clamping part. The metal pipe bending device also includes a protective member 41, which is connected to the first clamping module 6 and the second clamping module 8. The protective member 41 is configured to abut against at least a portion of the outer side of the bent pipe fitting 0 during the rotation of the second clamping module 8.

[0044] As the pipe 0 bends to one side, it gradually protrudes on the outside of the bend to form a bend structure. For example, when the pipe 0 bends to the left, the right side of the bend area of ​​the pipe 0 is its outside bend.

[0045] During the rotation of the second clamping module 8, the protective element 41 abuts against at least a portion of the outer side of the bent pipe fitting 0. This can be either a portion of the outer side of the bent pipe fitting 0 or the entire outer side of the bent pipe fitting 0.

[0046] In the above embodiments, when the pipe fitting 0 is bent, the protective member 41 abuts against at least a portion of the outer side of the bent pipe fitting 0, which can constrain the irregular deformation of the outer surface of the bent pipe fitting 0, thereby improving the quality of the final product.

[0047] In some embodiments, the protective member 41 includes a flexible plate with its opposite ends connected to a first clamping module 6 and a second clamping module 8, respectively. During the rotation of the second clamping module 8, the flexible plate abuts against at least a portion of the outer side of the bent pipe member 0.

[0048] The flexible plate can be made of materials such as polyimide (PI), polyester (PET), and polydimethylsiloxane (PDMS) to achieve bending deformation following the pipe fitting 0 and to abut against at least a portion of the pipe fitting 0.

[0049] With the settings in the above embodiments, at least a portion of the outer curved surface of the pipe fitting 0 can be abutted during the rotation of the second clamping module 8, thereby constraining the irregular deformation of the outer curved surface of the pipe fitting 0.

[0050] In some embodiments, the first clamping module 6 has a through groove on one edge near the second clamping module 8, and the flexible plate is telescopic and at least partially located within the through groove.

[0051] The first clamping module 6 clamps the pipe fitting 0 through the first receiving groove. The through groove and the first receiving groove are spaced apart, and the extension direction of the through groove and the extension direction of the first receiving groove can be the same.

[0052] The flexible plate is placed in the through groove and can be connected to the flexible plate at the bottom of the through groove by an elastic element, so that at least part of the flexible plate is telescopically located in the through groove.

[0053] In the above embodiments, the flexible plate is at least partially telescopically located in the through groove, which can drive the flexible plate to move while the second clamping tube module 8 rotates, so that the flexible plate can always be kept in a stretched state, thereby enabling the flexible plate to better abut against at least a part of the pipe fitting 0.

[0054] In some embodiments, the second clamping tube module 8 is provided with a first connector, and the flexible plate is provided with a second connector on the side near the second clamping tube module 8. The first connector and the second connector cooperate with each other to realize the detachable connection between the flexible plate and the second clamping tube.

[0055] The first and second connectors can be connected instantly, such as by snap-fit, to allow for immediate assembly and disassembly; other connection methods can also be used, such as by bolts.

[0056] In some examples, when using an instant connection, the first clamping module 6 and the second clamping module 8 can be separated during the bending operation of the pipe fitting 0. In this case, one of them clamps the pipe fitting 0 first, and then the other is attached to the first one to clamp the pipe fitting 0. During the attachment process, the second clamping module 8 is connected to the flexible plate, and then the pipe fitting 0 is bent. After the bending operation is completed, moving the second clamping module 8 can separate the second clamping module 8 from the flexible plate.

[0057] The above configuration enables the connection between the flexible plate and the second clamping tube module 8. Furthermore, the two are detachably connected, which facilitates bending operations, improves subsequent maintenance efficiency, and reduces maintenance burden.

[0058] In some embodiments, the first clamping module 6 has a first receiving groove, the second clamping module 8 has a second receiving groove, and when the second clamping module 8 and the first clamping module 6 are in a fitted state, the first receiving groove and the second receiving groove form a continuous groove.

[0059] When bending the pipe fitting 0, the pipe fitting 0 is strip-shaped before bending. At this time, the first receiving groove of the first clamping module 6 and the second receiving groove of the second clamping module 8 need to be kept on the same line so that the formed continuous groove clamps the pipe fitting 0. Then the second clamping module 8 is rotated to complete the bending operation. If the first receiving groove and the second receiving groove are too far apart, the bending effect of the pipe fitting 0 will be worse.

[0060] In view of this, this application adopts a method in which the first clamping module 6 and the second clamping module 8 are fitted together and the first receiving groove and the second receiving groove form a continuous groove to clamp the pipe fitting 0, which can improve the bending effect of the pipe fitting 0.

[0061] In some embodiments, the width of the first receiving groove is a, and the size of the protective member 41 is b along the direction of the width of the first receiving groove, where a≤b.

[0062] The first receiving groove extends along its length, and its width is a third direction perpendicular to both the length and depth directions. The width of the first receiving groove is 'a'. To clamp the pipe fitting 0, the width of the pipe fitting 0 is typically no greater than 'a'. Therefore, along the width of the first receiving groove, the size of the protective member 41 is greater than or equal to the size of the pipe fitting 0. This allows the protective member 41 to abut against the pipe fitting 0 over a larger area during the rotation of the second clamping module 8, further reducing the impact of irregular deformation on the outer side of the bent pipe fitting 0.

[0063] In some embodiments, the first receiving groove and / or the second receiving groove are arc-shaped grooves.

[0064] The first or second receiving groove can be an arc-shaped groove, or both the first and second receiving grooves can be arc-shaped grooves.

[0065] In the above embodiments, the arc-shaped groove enables the first and / or second receiving grooves to better accommodate the pipe fitting 0, especially for pipe fittings 0 of different sizes, thereby improving the adaptability of the metal pipe bending device.

[0066] In some embodiments, the second clamping module 8 is connected to the frame 1 via the wheel mold 4, and the swing center of the second clamping module 8 coincides with the swing center of the wheel mold 4. This arrangement enables the connection between the second clamping module 8 and the frame 1, and allows the second clamping module 8 to rotate under the drive of the wheel mold 4.

[0067] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A metal pipe bending device for bending pipe fittings, characterized in that, include: frame; A first pipe clamping module is connected to the frame, and the first pipe clamping module includes a first clamping part for clamping the pipe fitting; The second clamping module is rotatably connected to the frame. The second clamping module includes a second clamping part. The second clamping module is configured to bend the clamped tube through the second clamping part during rotation. A protective element, connected to the first clamping module and the second clamping module, is configured to abut against at least a portion of the outer side of the bent portion of the tube during rotation of the second clamping module.

2. The metal pipe bending device as described in claim 1, characterized in that, The protective component includes a flexible plate, with the first clamping module and the second clamping module respectively connected to opposite ends of the flexible plate. During the rotation of the second clamping module, the flexible plate abuts against at least a portion of the outer side of the bent pipe.

3. The metal pipe bending device as described in claim 2, characterized in that, The first clamping module has a through groove on one edge near the second clamping module, and the flexible plate is telescopic and at least partially located within the through groove.

4. The metal pipe bending device as described in claim 2, characterized in that, The second clamping tube module is provided with a first connector, and the flexible plate is provided with a second connector on the side near the second clamping tube module. The first connector and the second connector cooperate with each other to achieve a detachable connection between the flexible plate and the second clamping tube.

5. The metal pipe bending device as described in claim 1, characterized in that, The first clamping module has a first receiving groove, and the second clamping module has a second receiving groove. When the second clamping module and the first clamping module are in a fitted state, the first receiving groove and the second receiving groove form a continuous groove.

6. The metal pipe bending device as described in claim 5, characterized in that, The width of the first receiving groove is a, and the size of the protective member along the width of the first receiving groove is b, where a ≤ b.

7. The metal pipe bending device as described in claim 5, characterized in that, The first receiving groove and / or the second receiving groove are arc-shaped grooves.

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