Numerical control pipe bending mandrel device

Abstract

The application belongs to the technical field of mandrels, and particularly relates to a numerical control pipe bending mandrel device, which comprises a pipe body, a first inner cavity is formed at one end of an inner cavity of the pipe body, a connecting pipe is installed in the first inner cavity, a second inner cavity is arranged at the other end of the pipe body, a connecting bolt is arranged in the second inner cavity, the connecting bolt extends through the second inner cavity to the first inner cavity and is in threaded engagement with a first threaded hole formed at one end of the connecting pipe, a first circular groove is formed at the other end of the connecting pipe, and a plurality of elbow assemblies are connected to the outer side of the connecting pipe in sequence. In the application, the ball head is sleeved on the bearing and is limited by the limiting ring, the ball head is movably sleeved on the connecting block, the ball head can rotate in use, the situation that the local part is always in the curved position to cause the abrasion to be intensified is avoided, the ball head is consumed more evenly, the service life of the ball head is prolonged, and the ball head can be disassembled from the bearing by disassembling the limiting ring, so that the ball head is convenient to replace.

Description

Technical Field

[0001] This invention relates to the field of mandrel technology, specifically to a CNC mandrel bending device. Background Technology

[0002] CNC pipe bending mandrels are key auxiliary components in CNC pipe bending processes, adapting to the bending and forming of pipes. Their core function is to support the inner wall of the pipe cavity during bending. Through a design that conforms to the internal structure of the pipe, they prevent forming defects such as wrinkling, collapse, and cross-sectional distortion, while ensuring the accuracy of the bending angle and the consistency of the pipe's shape. Adaptable to different pipe specifications and bending process requirements, and through collaborative operation with CNC pipe bending equipment, they provide structural support for high-precision, high-quality pipe bending processes. They are essential foundational components for forming complex pipe components in aerospace, automotive manufacturing, and pipeline engineering fields.

[0003] In practical use, existing pipe bending mandrels experience wear due to contact between the elbow and the inner wall of the pipe. Worn elbows affect bending accuracy and necessitate replacement. Currently, replacement is often performed as a whole, which is inconvenient for individual elbow replacements, increasing maintenance costs. Therefore, a new technical solution is needed to address this issue. Summary of the Invention

[0004] The purpose of this invention is to provide a CNC mandrel bending device that solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a CNC pipe bending mandrel device, comprising a tube body, a first inner cavity being provided at one end of the inner cavity of the tube body, a connecting pipe being installed in the first inner cavity, a second inner cavity being provided at the other end of the tube body, a connecting bolt being provided in the second inner cavity, the connecting bolt extending through into the first inner cavity and threadedly engaging with a first threaded hole at one end of the connecting pipe, a first circular groove being provided at the other end of the connecting pipe, and a plurality of sequentially connected elbow assemblies being connected to the outside of the connecting pipe for bending to support the pipe; The elbow assembly includes a ball bearing, the outer end of which is integrally formed with a connecting block, and the outer wall of the connecting block is fitted with a ball head.

[0006] By adopting the above technical solution, the connecting bolts and connecting pipe threads are used to tighten the pipe and ensure stability. Then, multiple elbow assemblies are connected to the outer end of the connecting pipe. The bending of the pipe by multiple elbow assemblies can meet the support requirements of the pipe during the bending process and prevent the pipe from collapsing.

[0007] In a preferred embodiment of the present invention, the outer end face of the connecting block is provided with a second circular groove identical to the first circular groove, the ball is engaged in the first circular groove and the second circular groove, the inner cavity of the second circular groove is provided with a groove, the inner wall of the groove is provided with a second threaded hole, the inner thread of the second threaded hole is threaded through an adjusting bolt, the outer wall of the ball head is provided with a partition groove, and the outer end of the adjusting bolt extends into the partition groove.

[0008] By adopting the above technical solution, when the ball is inserted into the first or second circular groove, the ball can deform to a certain extent due to the setting of the partition groove, making the insertion operation convenient and labor-saving. After insertion, the adjusting bolt is rotated to insert the adjusting bolt into the partition groove, thereby pushing the two side walls of the partition groove cavity, causing the two sides of the ball to move outward, so that it can fit against the inner wall of the first or second circular groove, thus effectively limiting and preventing slippage. At the same time, during disassembly, simply rotate the adjusting bolt in the opposite direction to disengage it from the partition groove, so that the ball can be directly pulled out of the circular groove, making disassembly and assembly convenient and facilitating subsequent maintenance operations.

[0009] In a preferred embodiment of the present invention, the width of the inner cavity of the partition groove gradually decreases from the inside to the outside.

[0010] By adopting the above technical solution, after the adjusting bolt is inserted into the partition groove, the two sides of the rolling ball can be gradually pushed outward as the adjusting bolt moves.

[0011] In a preferred embodiment of the present invention, a second internal hexagonal groove is provided on the end of the adjusting bolt.

[0012] By adopting the above technical solution, the setting of the second internal hexagonal groove makes it easier to operate the adjusting bolt with the help of tools, thus making it easier to rotate the adjusting bolt.

[0013] In a preferred embodiment of the present invention, a bearing is fixedly fitted on the outer wall of the connecting block, the ball head is fitted on the bearing, the outer wall of the connecting block is provided with an external thread, a limit ring is fitted on the outer wall of the connecting block, and the inner wall of the limit ring is provided with a second internal thread, which engages with the external thread.

[0014] By adopting the above technical solution, the limiting ring can limit the ball head fitted on the bearing, ensuring its stable rotation. The ball head fitted on the bearing allows it to rotate, thus changing the position of the outer surface of the ball head during use. This helps to avoid localized bending that would cause accelerated wear, resulting in more even wear of the ball head and extending its service life. Furthermore, removing the limiting ring allows the ball head to be removed from the bearing, facilitating replacement and improving the convenience of replacement operations. It also reduces subsequent maintenance costs after the ball head wears out.

[0015] In a preferred embodiment of the present invention, the inner wall of the limiting ring is movably fitted with a plurality of evenly distributed balls.

[0016] By adopting the above technical solution and the ball bearing configuration, wear during ball head rotation is reduced.

[0017] In a preferred embodiment of the present invention, the outer peripheral wall of the ball head is provided with an arc surface, and the inner walls on both sides of the ball head are provided with inclined surfaces.

[0018] By adopting the above technical solution, the outer surface of the ball head is arc-shaped, and inclined surfaces are opened on both sides of the inner wall of the ball head, so that the ball head can bend to the maximum extent during the bending process, thereby improving the adaptability of the bending angle.

[0019] In a preferred embodiment of the present invention, the inner wall of the first inner cavity of the tube body is provided with a first internal thread.

[0020] By adopting the above technical solution, the setting of the first internal thread makes it convenient to connect with the external push rod, thereby facilitating the push of the device to the designated position inside the pipe cavity and adapting to the needs of the pipe's bending position.

[0021] In a preferred embodiment of the present invention, the end of the connecting bolt is provided with a first internal hexagonal groove. The provision of the first internal hexagonal groove makes it convenient to disassemble the connecting bolt with a hexagonal wrench, making the operation convenient and labor-saving.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses a ball joint fitted onto a bearing and a limiting ring to restrict its movement, allowing the ball joint to rotate on a connecting block during use. This allows the position of the ball joint's outer surface to change, preventing localized wear caused by constant bending and resulting in more even wear of the ball joint, thus extending its service life. Furthermore, removing the limiting ring allows the ball joint to be removed from the bearing, facilitating replacement and improving ease of operation. It also reduces maintenance costs after the ball joint wears out. The ball has a double-lobed structure, which allows the ball to move outward on both sides after it is connected to the groove. This makes the ball and groove stable and prevents slippage. When disassembling, the limiting bolts are moved outward, allowing the ball to deform under pressure and be easily pulled out of the groove. This makes it easy to disassemble and replace if damaged.

[0023] The ball head has an arc-shaped outer surface and inclined surfaces on both sides of the inner wall, which allows the ball head to bend to the maximum extent during bending, thus improving the adaptability of the bending angle. Attached Figure Description

[0024] 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: Figure 1 This is a schematic diagram of the overall structure of a CNC pipe bending mandrel device according to the present invention; Figure 2 This is a cross-sectional view of a CNC pipe bending mandrel device according to the present invention; Figure 3 This is a schematic diagram of the bending head assembly structure of a CNC pipe bending mandrel device according to the present invention; Figure 4 This is a schematic diagram of the ball head structure of a CNC pipe bending mandrel device according to the present invention; Figure 5 This is a schematic diagram of the adjusting bolt structure of a CNC pipe bending mandrel device according to the present invention.

[0025] In the picture: 1. Pipe body; 11. Second inner cavity; 12. Connecting bolt; 13. First internal thread; 2. Connecting pipe; 21. First threaded hole; 22. First circular groove; 3. Connecting block; 31. Ball; 32. Ball head; 33. Second circular groove; 34. Second threaded hole; 35. Separating groove; 36. Bearing; 37. Limiting ring; 38. Ball; 39. Arc surface; 4. Adjusting bolt; 41. Second internal hexagonal recess; 5. Inclined surface. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "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 invention 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 invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The model numbers of the electrical appliances provided in this invention are for reference only, and different models of electrical appliances with the same function can be replaced according to actual usage.

[0029] Please see Figure 1-5 The present invention provides a technical solution: a CNC pipe bending mandrel device, including a pipe body 1, a first inner cavity is opened at one end of the inner cavity of the pipe body 1, a connecting pipe 2 is installed in the first inner cavity, a second inner cavity 11 is provided at the other end of the pipe body 1, a connecting bolt 12 is provided in the second inner cavity 11, the connecting bolt 12 extends through into the first inner cavity and is threadedly engaged with a first threaded hole 21 opened at one end of the connecting pipe 2, a first circular groove 22 is opened at the other end of the connecting pipe 2, and a plurality of elbow assemblies connected in sequence are connected to the outside of the connecting pipe 2 for bending to support the pipe; The elbow assembly includes a ball bearing 31, with a connecting block 3 integrally formed at the outer end of the ball bearing 31, and a ball head 32 fitted onto the outer wall of the connecting block 3.

[0030] It should be understood that in actual use, the connecting bolt 12 and the connecting pipe 2 are threaded together to tighten them and ensure stability. Then, multiple elbow assemblies are connected to the outer end of the connecting pipe 2. The bending of the multiple elbow assemblies can meet the support requirements of the pipe during the bending process and prevent the pipe from collapsing.

[0031] Furthermore, the end of the connecting bolt 12 is provided with a first internal hexagonal groove. The first internal hexagonal groove makes it easy to disassemble the connecting bolt 12 with a hexagonal wrench, making the operation convenient and labor-saving.

[0032] Furthermore, the inner wall of the first inner cavity of the pipe body 1 is provided with a first internal thread 13. The first internal thread 13 makes it easy to connect with the external push rod, thereby making it easy to push the device to the designated position in the inner cavity of the pipe to adapt to the needs of the pipe bending position.

[0033] like Figure 1 and 2 As shown in Figures 3 and 5; the outer end face of the connecting block 3 is provided with a second circular groove 33 that is the same as the first circular groove 22. The ball 31 is engaged in the first circular groove 22 and the second circular groove 33. The inner cavity of the second circular groove 33 is provided with a groove. The inner wall of the groove is provided with a second threaded hole 34. The adjusting bolt 4 is threaded through the second threaded hole 34. The middle of the outer wall of the ball head 32 is provided with a partition groove 35. The outer end of the adjusting bolt 4 extends into the partition groove 35. The partition groove 35 makes the ball 31 have a double-lobed structure. It should be understood that in actual use, when the ball 31 is inserted into the first circular groove 22 or the second circular groove 33, the ball 31 can deform to a certain extent due to the setting of the partition groove 35, making the insertion operation convenient and labor-saving. After insertion, by rotating the adjusting bolt 4, the adjusting bolt 4 is inserted into the partition groove 35, thereby pushing the two side walls of the inner cavity of the partition groove 35, causing the two sides of the ball 31 to move outward, so that it can fit against the inner wall of the first circular groove 22 or the second circular groove 33, thereby effectively limiting and preventing slippage. At the same time, when disassembling, simply rotate the adjusting bolt 4 in the opposite direction to disengage it from the partition groove 35, so that the ball 31 can be directly pulled out of the circular groove, making disassembly and assembly convenient and facilitating subsequent maintenance operations.

[0034] Furthermore, the width of the inner cavity of the partition groove 35 gradually decreases from the inside to the outside. It should be understood that after the adjusting bolt 4 is inserted into the partition groove 35, as the adjusting bolt 4 moves, it can gradually push the two sides of the ball 31 to move outward.

[0035] Furthermore, a second internal hexagonal groove 41 is provided on the end of the adjusting bolt 4. The setting of the second internal hexagonal groove 41 makes it easier to operate the adjusting bolt 4 with tools, thereby making it easier to rotate the adjusting bolt 4.

[0036] like Figure 1 , 3 As shown in Figure 4; the outer wall of the connecting block 3 is fixedly fitted with a bearing 36, the ball head 32 is fitted on the bearing 36, the outer wall of the connecting block 3 is provided with an external thread, the outer wall of the connecting block 3 is fitted with a limit ring 37, the inner wall of the limit ring 37 is provided with a second internal thread, and the second internal thread and the external thread mesh. It should be understood that in actual use, the limiting ring 37 can limit the ball head 32 fitted on the bearing 36, ensuring its stable rotation. The ball head 32 fitted on the bearing 36 allows it to rotate, thus allowing the ball head 32 to rotate during use. This allows the position of the outer surface of the ball head 32 to change, which helps to avoid localized bending that would cause accelerated wear. This results in more even wear of the ball head 32, which helps to extend its service life. Furthermore, removing the limiting ring 37 allows the ball head 32 to be removed from the bearing 36, making it easier to replace the ball head 32. This improves the convenience of replacement operations and reduces the later maintenance costs after the ball head 32 wears out.

[0037] Furthermore, the inner wall of the limiting ring 37 is movably fitted with multiple evenly distributed balls 38. The arrangement of the balls 38 helps to reduce wear during the rotation of the ball head 32.

[0038] Furthermore, the outer peripheral wall of the ball head 32 is provided with an arc surface 39, and the inner walls on both sides of the ball head 32 are provided with inclined surfaces 5; It should be understood that the outer surface of the ball head 32 is arc-shaped, and inclined surfaces 5 are provided on both sides of the inner wall of the ball head 32, so that the ball head can bend to the maximum extent during the bending process, thereby improving the adaptability of the bending angle.

[0039] Furthermore, the components included in the CNC pipe bending mandrel device of the present invention are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle part of the device, all the above-mentioned electrical components, which refer to power elements, electrical components, and the matching monitoring computer and power supply, are connected by wires. The electrical connection between each electrical component is completed in the order of operation. The detailed connection method is a well-known technology in the art. The following mainly introduces the working principle and process, and will not describe the electrical control.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A CNC pipe bending mandrel device, comprising a pipe body (1), characterized in that: The inner cavity of the pipe body (1) is provided with a first inner cavity at one end, and a connecting pipe (2) is installed in the first inner cavity. The other end of the pipe body (1) is provided with a second inner cavity (11), and a connecting bolt (12) is provided in the second inner cavity (11). The connecting bolt (12) extends through into the first inner cavity and is threadedly engaged with a first threaded hole (21) at one end of the connecting pipe (2). The other end of the connecting pipe (2) is provided with a first circular groove (22). Multiple elbow assemblies are connected to the outside of the connecting pipe (2) in sequence for bending to support the pipe. The elbow assembly includes a ball (31), the outer end of which is integrally formed with a connecting block (3), and the outer wall of the connecting block (3) is fitted with a ball head (32).

2. The CNC pipe bending mandrel device according to claim 1, characterized in that: The outer end face of the connecting block (3) is provided with a second circular groove (33) that is the same as the first circular groove (22). The ball (31) is engaged in the first circular groove (22) and the second circular groove (33). The inner cavity of the second circular groove (33) is provided with a groove. The inner wall of the groove is provided with a second threaded hole (34). An adjusting bolt (4) is threaded through the second threaded hole (34). A partition groove (35) is provided in the middle of the outer wall of the ball head (32). The outer end of the adjusting bolt (4) extends into the partition groove (35).

3. The CNC mandrel bending device according to claim 2, characterized in that: The width of the inner cavity of the partition groove (35) gradually decreases from the inside to the outside.

4. The CNC mandrel bending device according to claim 2, characterized in that: The adjusting bolt (4) has a second internal hexagonal groove (41) on its end.

5. The CNC mandrel bending device according to claim 1, characterized in that: The outer wall of the connecting block (3) is fixedly fitted with a bearing (36), the ball head (32) is fitted on the bearing (36), the outer wall of the connecting block (3) is provided with an external thread, the outer wall of the connecting block (3) is fitted with a limit ring (37), the inner wall of the limit ring (37) is provided with a second internal thread, and the second internal thread and the external thread mesh.

6. The CNC pipe bending mandrel device according to claim 5, characterized in that: The inner wall of the limiting ring (37) is movably fitted with a plurality of evenly distributed balls (38).

7. A CNC mandrel bending device according to claim 5, characterized in that: The outer peripheral wall of the ball head (32) is provided with an arc surface (39), and the inner walls on both sides of the ball head (32) are provided with inclined surfaces (5).

8. The CNC mandrel bending device according to claim 1, characterized in that: The inner wall of the first inner cavity of the tube (1) is provided with a first internal thread (13).

9. A CNC mandrel bending device according to claim 1, characterized in that: The end of the connecting bolt (12) is provided with a first internal hexagonal groove.

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