Variable-diameter core ball

Abstract

The utility model provides a variable-diameter core ball, and belongs to the technical field of pipe fitting bending forming. The problems that the diameter of a traditional supporting piece cannot be flexibly changed, the diameter cannot be changed in real time, the diameter can only be changed by replacing a core ball, and the operation is troublesome are solved. The variable-diameter core ball comprises a main body connecting part, a variable-diameter moving part and an arc supporting part which are sequentially assembled, the main body connecting part is used for installing the variable-diameter moving part and the arc supporting part, and the variable-diameter moving part is used for adjusting the diameter of the arc supporting part. The device has the advantages that the self-locking capacity is achieved, it is guaranteed that the adjusted diameter cannot be changed due to loads, the diameter can be changed in real time, and the large supporting area is achieved.

Description

Technical Field

[0001] This utility model relates to the field of pipe bending and forming technology, specifically a variable diameter core ball. Background Technology

[0002] Currently, pipe bending technology is widely used in the aerospace and automotive manufacturing industries, and improving the quality of pipe bending plays a crucial role in increasing production efficiency. However, because pipes are hollow, directly placing them in a pipe bending machine for bending will cause various defects, including wrinkling, collapse, and cross-sectional distortion. To avoid affecting the quality of pipe bending, mandrels are usually placed inside the pipe as supports to prevent these defects. However, during production, for pipes of different diameters, a series of mandrels of different diameters are often required as supports. These supports cannot flexibly change their diameter, and real-time diameter changes are not possible; the diameter can only be changed by replacing the mandrel, which is quite cumbersome. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a variable diameter core ball with self-locking capability, ensuring that the adjusted diameter will not change due to load, and the advantage of being able to change the diameter in real time to achieve a larger support area. This solves the problem that traditional support components cannot flexibly change the diameter and cannot be changed in real time, and the diameter can only be changed by replacing the core rod, which is quite troublesome.

[0005] (II) Technical Solution

[0006] To achieve the aforementioned self-locking capability, ensure that the adjusted diameter does not change due to load, and enable real-time adjustment of the diameter to achieve a larger support area, this utility model provides the following technical solution: a variable diameter core ball, comprising a main body connecting part, a variable diameter moving part, and an arc support part assembled sequentially. The main body connecting part is used to install the variable diameter moving part and the arc support part, and the variable diameter moving part is used to adjust the diameter of the arc support part.

[0007] Preferably, the main body connection portion includes a first mounting plate, a second mounting plate, a third mounting plate, and a fourth mounting plate that are fixedly connected together in sequence.

[0008] Preferably, the first mounting plate and the second mounting plate are provided with corresponding first slots and first rectangular platforms, and the third mounting plate and the fourth mounting plate are provided with corresponding second rectangular platforms and second slots.

[0009] Preferably, the variable diameter moving part includes a counterclockwise jaw, a first motor, a motor mounting plate, and a counterclockwise chuck. The counterclockwise chuck is mounted inside a second mounting plate and has a second threaded groove. The counterclockwise jaw has a first threaded groove, and the counterclockwise jaw and the counterclockwise chuck are assembled together through the first and second threaded grooves.

[0010] The counterclockwise chuck is slidably installed in the first slot and the first rectangular platform. The first motor is fixedly installed on the second mounting plate through the motor mounting plate. The first motor is fixedly connected to the counterclockwise chuck.

[0011] When the first motor is working, the counterclockwise chuck will drive the counterclockwise chuck claw to move radially in the first slot and the first rectangular platform.

[0012] Preferably, the variable diameter movement part further includes a clockwise chuck, a clockwise chuck, and a second motor. The clockwise chuck is installed in a third mounting plate and has a third threaded groove. The clockwise chuck has a fourth threaded groove. The clockwise chuck and the clockwise chuck are assembled together through the fourth threaded groove and the third threaded groove. The clockwise chuck is slidably installed in a second slot and a second rectangular platform. The second motor is fixedly installed on the third mounting plate through a motor mounting plate and is fixedly connected to the clockwise chuck.

[0013] When the second motor is working, the clockwise chuck will drive the clockwise pawl to move radially in the second slot and the second rectangular platform.

[0014] Preferably, the arc support portion includes an I-shaped arc plate, a cross-shaped arc plate, and a support rod. The support rod is fixedly installed on the counterclockwise jaw and the clockwise jaw, respectively. The I-shaped arc plate is installed on the support rod on the counterclockwise jaw, and the cross-shaped arc plate is installed on the support rod on the clockwise jaw.

[0015] Preferably, the number of I-shaped arc plates and cross-shaped arc plates are the same and they are installed alternately in sequence, and the outer contours of the I-shaped arc plates and cross-shaped arc plates compensate for each other.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present invention provides a variable diameter core ball, which has the following beneficial effects:

[0018] This variable-diameter core ball utilizes the coordinated use of a main connecting part, a variable-diameter moving part, and an arc-shaped support part. First, the first, second, third, and fourth mounting plates are assembled together using screws. Then, the first motor mounting plate is mounted onto the second mounting plate using screws, and the second motor mounting plate is mounted onto the third mounting plate using screws. A key is then used to assemble the counter-clockwise chuck and the first motor together, and similarly, a key is used to assemble the clockwise chuck and the second motor together. The first and second motors are then mounted on their respective motor mounting plates. Six counter-clockwise and six clockwise jaws are threaded together with the chuck and chuck through a first slot, a first rectangular platform, a second slot, and a second rectangular platform. Through this threaded assembly, twelve support rods are fitted into the threaded holes at the tails of the jaws. I-shaped and cross-shaped arc plates are then attached to the tails of the support rods to provide support.

[0019] The process of increasing the radius involves first controlling the first motor to move counterclockwise, causing the chuck, jaws, and the arc-shaped support block mounted on the jaws to move radially outward in a linear motion until the required radius is reached. Then, the second motor is adjusted to rotate clockwise, slowly moving to the required position. Conversely, the process of decreasing the radius involves first controlling the second motor to move counterclockwise until the required radius is reached, then controlling the first motor to rotate clockwise to the required position. Throughout the process, the I-shaped arc plate and the cross-shaped arc plate are controlled by the motors at time intervals, ensuring no interference during contraction and maximizing the support surface area. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a variable diameter core ball structure according to the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a variable diameter core ball component of this utility model;

[0022] Figure 3 This is a schematic diagram of a counterclockwise chuck movement structure for a variable diameter core ball according to this utility model;

[0023] Figure 4 This is a schematic diagram of a clockwise chuck movement structure for a variable diameter core ball according to this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the main body connection part of a variable diameter core ball according to this utility model;

[0025] Figure 6 This is an exploded view of the main body connection part of a variable diameter core ball according to this utility model;

[0026] Figure 7This is an exploded view of the variable diameter moving part of a variable diameter core ball according to this utility model;

[0027] Figure 8 This is a schematic diagram of a counterclockwise chuck structure for a variable diameter core ball according to this utility model;

[0028] Figure 9 This is a schematic diagram of a clockwise chuck structure for a variable diameter core ball according to the present invention;

[0029] Figure 10 This is a schematic diagram of the third mounting plate structure for a variable diameter core ball according to the present invention;

[0030] Figure 11 This is a schematic diagram of a variable diameter core sphere I-shaped arc plate according to the present invention;

[0031] Figure 12 This is an exploded view of the installation of a variable diameter core ball I-shaped arc plate according to this utility model;

[0032] Figure 13 This is a schematic diagram of a variable diameter core ball cross-shaped arc plate of the present invention.

[0033] Figure 14 This is an exploded view of the installation of a variable diameter core ball cross-shaped arc plate according to this utility model.

[0034] In the picture:

[0035] 1. Variable diameter core ball;

[0036] 2. Main body connection part; 21. First mounting plate; 211. First threaded through hole; 212. First groove; 213. Ball head; 22. Second mounting plate; 221. First threaded hole; 222. Second threaded through hole; 223. Second threaded hole; 224. First rectangular platform; 23. Third mounting plate; 231. Third threaded through hole; 232. Fourth threaded through hole; 233. Second rectangular platform; 234. Third threaded hole; 24. Fourth mounting plate; 241. Fifth threaded through hole; 242. Second groove; 243. Sixth threaded through hole;

[0037] 3. Variable diameter moving part; 31. Counterclockwise chuck; 311. Fourth threaded hole; 312. First threaded groove; 313. First rectangular groove; 32. First motor; 33. Motor mounting plate; 331. Seventh threaded through hole; 332. Third slot; 34. Counterclockwise chuck; 341. Second threaded groove; 35. Clockwise chuck; 351. Third threaded groove; 36. Clockwise chuck; 361. Fifth threaded hole; 362. Fourth threaded groove; 363. Second rectangular groove; 37. Second motor;

[0038] 4. Arc support section; 41. I-shaped arc plate; 411. Sixth threaded hole; 42. Cross-shaped arc plate; 421. Seventh threaded hole; 43. Support rod; 431. First threaded section; 432. Second threaded section. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] Please see Figure 1-14 A variable-diameter core ball 1 consists of a main connecting part 2, a variable-diameter moving part 3, and an arc-shaped support part 4. The main connecting part 2 supports and fixes the variable-diameter moving part 3 and the arc-shaped support part 4. The variable-diameter moving part 3 changes the diameter of the arc-shaped support part 4, thereby supporting bent pipes of different diameters. Furthermore, a self-locking structure is formed by the interaction of a counterclockwise chuck 34 and counterclockwise jaws 31, and a clockwise chuck 35 and clockwise jaws 36, to resist loads.

[0041] Meanwhile, since the arc support part 4 adopts an I-shaped arc plate 41 and a cross-shaped arc plate 42 with mutually compensating outer contours, the purpose of setting the special shape of the I-shaped arc plate 41 and the cross-shaped arc plate 42 is to ensure that the core ball achieves the largest possible support spherical surface during the tube bending process. The radius of the entire arc support surface is set according to the maximum position of the movement. Therefore, when the arc blocks have the same shape and retract inward together, they will cause interference and collision. In order to ensure the largest possible support spherical surface and avoid interference, this patent sets this special support block shape and uses two independent motors as drives. First, one arc support surface is retracted, and then the other support surface is retracted, ensuring that there is no interference while still achieving the largest possible support requirement.

[0042] The first mounting plate 21 has six first threaded through holes 211, six first slots 212, and a ball head 213. The second mounting plate 22 has six first threaded holes 221, six second threaded through holes 222, six second threaded holes 223, and six first rectangular platforms 224. The third mounting plate 23 has six third threaded through holes 231, six fourth threaded through holes 232, six second rectangular platforms 233, and six third threaded holes 234. The fourth mounting plate 24 has six fifth threaded through holes 241, six second slots 242, and six sixth threaded through holes 243.

[0043] The first mounting plate 21 and the second mounting plate 22 are assembled together by screws, which are used to assemble the six first threaded through holes 211 and the six first threaded holes 221 together.

[0044] The second mounting plate 22 and the third mounting plate 23 are assembled by screws to fit together six second threaded through holes 222 and six third threaded through holes 231.

[0045] The third mounting plate 23 and the fourth mounting plate 24 are assembled by screws to fit together six fourth threaded through holes 232 and six fifth threaded through holes 241.

[0046] Assembling the four mounting plates will form the overall outline of the core ball. Installing the diameter-changing moving part 3 inside the hollow cavity will then achieve the diameter-changing function. Each mounting plate—first mounting plate 21, second mounting plate 22, third mounting plate 23, and fourth mounting plate 24—has specific slots for mounting counter-clockwise claws 31 and clockwise claws 36 onto the main body connecting part 2 and the chuck. Each slot is 60 degrees apart to ensure that the arc-shaped support parts 4 are evenly distributed as much as possible during subsequent assembly, and that their movement does not interfere with each other.

[0047] The variable diameter moving part 3 includes six counterclockwise chucks 31, a first motor 32, a motor mounting plate 33, a counterclockwise chuck 34, a clockwise chuck 35, six clockwise chucks 36, and a second motor 37.

[0048] The six counter-clockwise chucks 31 are provided with a fourth threaded hole 311, a first threaded groove 312, and a first rectangular groove 313. The motor mounting plate 33 is provided with six seventh threaded through holes 331 and a third slot 332. The counter-clockwise chuck 34 is provided with a second threaded groove 341. The clockwise chuck 35 is provided with a third threaded groove 351. The six clockwise chucks 36 are provided with a fifth threaded hole 361, a fourth threaded groove 362, and a second rectangular groove 363.

[0049] The six counterclockwise jaws 31 and the counterclockwise chuck 34 are assembled via a planar thread (this planar thread refers to the trajectory obtained when a point on the plane deviates from the center of the circle at a constant speed during rotation). A specially designed first threaded groove 312 is machined on the jaw surface of the six counterclockwise jaws 31, and a specially designed second threaded groove 341 is machined on the disc surface of the counterclockwise chuck 34. Assembly between the two is achieved through the connection between the threaded grooves and their openings. The clockwise chuck 35 and the six clockwise jaws 36 are also assembled via the aforementioned planar thread connection.

[0050] The first motor 32 is mounted on the motor mounting plate 33 with screws. The second motor 37 is mounted on the motor mounting plate 33 with screws. The counterclockwise chuck 34 is connected to the first motor 32 via a keyway. The clockwise chuck 35 is connected to the second motor 37 via a keyway.

[0051] The motor mounting plate 33 is mounted on the second mounting plate 22 by connecting six second threaded holes 223 and six seventh threaded through holes 331 with screws; similarly, the motor mounting plate 33 is mounted on the third mounting plate 23 by connecting six third threaded holes 234 and six seventh threaded through holes 331 with screws.

[0052] After assembly, the first slot 212 on the first mounting plate 21 and the first rectangular platform 224 on the second mounting plate 22 can precisely achieve the assembly of the first rectangular slots 313 on the six counterclockwise chucks 31. Based on the principle of slot mating, the counterclockwise chucks 31 can only move in a straight line along the rectangular slots. Furthermore, as described above, the bottoms of the six counterclockwise chucks 31 are connected to the counterclockwise chuck 34 via planar threaded connections.

[0053] Therefore, when the first motor 32 starts, the counterclockwise chuck 34, which is assembled with the first motor 32, will rotate counterclockwise. According to the characteristics of the slot fit, the object will move along the shape of the slot, and this movement will be confined within the slot. The counterclockwise pawl 31 will also rotate counterclockwise without other constraints. However, at this time, the counterclockwise pawl 31 is constrained circumferentially by the slot fit on the second mounting plate 22. Therefore, the rotation of the counterclockwise chuck 34 can only cause the counterclockwise pawl 31 to move linearly outward along the rectangular slot. Since the rectangular slots all pass through the center of the circle in the radial direction, the linear motion is an outward linear motion along the diameter.

[0054] Similarly, the second rectangular platform 233 on the third mounting plate 23 and the second slot 242 on the fourth mounting plate 24, after assembly, can perfectly accommodate the second rectangular slots 363 on the six clockwise chucks 35. Furthermore, as described above, the bottoms of the six clockwise chucks 36 are connected to the clockwise chuck 35 via planar threaded connections.

[0055] Similarly, when the second motor 37 starts, the clockwise chuck 35, which is assembled with the second motor 37, will rotate clockwise. According to the characteristics of slot fits, the object will move along the shape of the slot, and this movement will be confined within the slot. The clockwise chuck 35 will also rotate clockwise without other constraints. However, at this time, the clockwise pawl 36 is constrained circumferentially by the slot fit on the third mounting plate 23. Therefore, the rotation of the clockwise chuck 35 can only cause the clockwise pawl 36 to move linearly outward along the rectangular slot. Since the rectangular slots all pass through the center of the circle in the radial direction, the linear motion is an outward linear motion along the diameter.

[0056] In summary, the principle of the variable diameter core ball can be described as follows: When the first motor 32 rotates counterclockwise and the second motor 37 rotates clockwise, all the jaws move outward in a linear motion in the radial direction, thus increasing the radius. When the first motor 32 rotates clockwise and the second motor 37 rotates counterclockwise, all the jaws move inward in a linear motion in the radial direction, thus decreasing the radius. The spiral grooves on the chuck and the jaws are self-locking, ensuring that the radius of the variable diameter core ball 1 will not change under certain loads during the bending process.

[0057] The arc support section 4 includes six I-shaped arc plates 41, six cross-shaped arc plates 42, and twelve support rods 43.

[0058] The I-shaped arc plate 41 is provided with a sixth threaded hole 411; the cross-shaped arc plate 42 is provided with a seventh threaded hole 421; the twelve support rods 43 are provided with a first threaded section 431 and a second threaded section 432.

[0059] The six support rods 43 are mounted on the six counterclockwise clasps 31 by assembly between the first threaded section 431 and the fourth threaded hole 311; the six support rods 43 are mounted on the six clockwise clasps 36 by assembly between the first threaded section 431 and the fifth threaded hole 361; the six I-shaped arc plates 41 are mounted on the six support rods 43 by assembly between the sixth threaded hole 411 and the second threaded section 432; and the six cross-shaped arc plates 42 are mounted on the six support rods 43 by assembly between the seventh threaded hole 421 and the second threaded section 432.

[0060] When the variable diameter moving part 3 moves radially with the chuck, the arc support part 4 can move radially along with it, and at the same time, it can support the pipe during the bending process.

[0061] The purpose of setting the I-shaped arc plate 41 and the cross-shaped arc plate 42 in a special shape is to ensure that the core ball achieves the largest possible support surface during the tube bending process. The radius of the entire arc support surface is set according to the maximum position of the movement. Therefore, when the arc blocks have the same shape and contract inward together, they will cause interference and collision.

[0062] To ensure the largest possible support surface and prevent interference, this patent features a special support block shape that uses two independent motors for driving. First, one arc support surface is contracted, and then the other support surface is contracted, ensuring no interference while still fulfilling the maximum possible support requirements.

[0063] Working principle: First mounting plate 21, second mounting plate 22, third mounting plate 23, and fourth mounting plate 24 are assembled together using screws. Then, first motor mounting plate 33 is mounted onto second mounting plate 22 using screws, and second motor mounting plate 33 is mounted onto third mounting plate 23 using screws. Next, counter-clockwise chuck 34 and first motor 32 are assembled together using a key connection. Similarly, clockwise chuck 35 and second motor 37 are assembled together using a key. First motor 32 and second motor 37 are then mounted onto the two motor mounting plates 33 respectively. Six counter-clockwise jaws 31 and six clockwise jaws 36 are threaded together with the chuck and chuck through the first slot 212, first rectangular platform 224, second slot 242, and second rectangular platform 233. Through threaded assembly, twelve support rods 43 are respectively assembled into the threaded holes at the tail of the jaws. I-shaped arc plates 41 and cross-shaped arc plates 42 are then installed at the tails of the support rods 43 to provide support.

[0064] By first controlling the first motor 32 to move counterclockwise, the chuck drives the jaws and the arc-shaped support block mounted on the jaws to move outward in a linear radial direction until the required radius is reached. Then, the second motor 37 is adjusted to rotate clockwise, slowly moving to the required position. This is the process of increasing the radius. Conversely, by first controlling the second motor 37 to move counterclockwise until the required radius is reached, and then controlling the first motor 32 to rotate clockwise to the required position, this is the method of decreasing the radius. Throughout the entire process, the I-shaped arc plate 41 and the cross-shaped arc plate 42 are controlled by motors at time intervals, ensuring that they do not interfere with each other during the shrinkage process, while also ensuring the largest possible support surface during support.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0066] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable diameter core ball (1) characterised in that: It includes a main body connecting part (2), a variable diameter moving part (3), and an arc support part (4) assembled in sequence. The main body connecting part (2) is used to install the variable diameter moving part (3) and the arc support part (4). The variable diameter moving part (3) is used to adjust the diameter of the arc support part (4).

2. A variable diameter core ball (1) according to claim 1, characterized in that: The main connecting part (2) includes a first mounting plate (21), a second mounting plate (22), a third mounting plate (23) and a fourth mounting plate (24) that are fixedly connected together in sequence.

3. A variable diameter core ball (1) according to claim 2, characterized in that: The first mounting plate (21) and the second mounting plate (22) are provided with corresponding first slots (212) and first rectangular platforms (224), and the third mounting plate (23) and the fourth mounting plate (24) are provided with corresponding second rectangular platforms (233) and second slots (242).

4. A variable diameter core ball (1) according to claim 1, characterized in that: The variable diameter moving part (3) includes a counterclockwise chuck (31), a first motor (32), a motor mounting plate (33), and a counterclockwise chuck (34). The counterclockwise chuck (34) is installed in the second mounting plate (22). The counterclockwise chuck (34) is provided with a second threaded groove (341). The counterclockwise chuck (31) is provided with a first threaded groove (312). The counterclockwise chuck (31) and the counterclockwise chuck (34) are assembled together through the first threaded groove (312) and the second threaded groove (341). The counterclockwise chuck (31) is slidably installed in the first slot (212) and the first rectangular platform (224). The first motor (32) is fixedly installed on the second mounting plate (22) through the motor mounting plate (33). The first motor (32) is fixedly connected to the counterclockwise chuck (34). When the first motor (32) is working, the counterclockwise chuck (34) will drive the counterclockwise chuck (31) to move radially in the first slot (212) and the first rectangular platform (224).

5. A variable diameter core ball (1) according to claim 1, characterized in that: The variable diameter moving part (3) also includes a clockwise chuck (36), a clockwise chuck (35), and a second motor (37). The clockwise chuck (35) is installed in the third mounting plate (23). The clockwise chuck (35) is provided with a third threaded groove (351). The clockwise chuck (36) is provided with a fourth threaded groove (362). The clockwise chuck (36) and the clockwise chuck (35) are assembled together through the fourth threaded groove (362) and the third threaded groove (351). The clockwise chuck (36) is slidably installed in the second slot (242) and the second rectangular platform (233). The second motor (37) is fixedly installed on the third mounting plate (23) through the motor mounting plate (33). The second motor (37) is fixedly connected to the clockwise chuck (35). When the second motor (37) is working, the clockwise chuck (35) will drive the clockwise chuck (36) to make radial movements in the second slot (242) and the second rectangular platform (233).

6. A variable diameter core ball (1) according to claim 1, characterized in that: The circular arc supporting part (4) comprises I-shaped circular arc plates (41), cross-shaped circular arc plates (42) and supporting rods (43), the supporting rods (43) are fixedly installed on the counterclockwise clamping claw (31) and the clockwise clamping claw (36) respectively, the I-shaped circular arc plates (41) are installed on the supporting rods (43) on the counterclockwise clamping claw (31), and the cross-shaped circular arc plates (42) are installed on the supporting rods (43) on the clockwise clamping claw (36).

7. A variable diameter core ball (1) according to claim 6, characterized in that: The I-shaped circular arc plates (41) and the cross-shaped circular arc plates (42) are equal in number and are alternately installed in sequence, and the outer contours of the I-shaped circular arc plates (41) and the cross-shaped circular arc plates (42) are mutually complementary.

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