A high-current bushing core tooling fixture

Abstract

This utility model provides a high-current bushing core tooling fixture, including a hollow shaft cylinder. Two sets of support assemblies are arranged on the shaft cylinder along its axial extension direction. Each set of support assemblies includes at least three support rods evenly distributed along the circumference of the shaft cylinder. The support rods are connected to a telescopic mechanism, which drives the support rods to telescopically extend and retract along the radial direction of the shaft cylinder. An end cap is detachably installed at the end of the shaft cylinder. In use, firstly, based on the bushing core, the telescopic mechanism drives the support rods to extend outwards until the distance from the end of the support rod to the shaft cylinder axis is slightly less than the radius of the bushing core. Then, the bushing core is fitted onto the outside of the support rods. The telescopic mechanism is then continued to be driven so that the end of the support rod presses against the inner wall of the bushing core. Subsequently, a machine tool chuck clamps the first end of the shaft cylinder, and the machine tool tip presses against the end cap at the second end of the shaft cylinder to complete the clamping of the bushing core.

Description

Technical Field

[0001] This utility model relates to the field of tube processing technology, and in particular to a high-current bushing core tooling fixture. Background Technology

[0002] In the field of electrical engineering, the core of a high-current bushing is one of its key components. These cores are typically manufactured by high-current bushing manufacturers, and they require precise machining to ensure accuracy in size and shape. Because these high-current bushing cores are made of epoxy resin-impregnated paper, they are relatively large in diameter and thin, generally exceeding Φ400mm in diameter. Due to limitations in lathe clamping jaws, they are sometimes not securely clamped. Existing solutions mainly involve using tooling fixtures. Multiple adjustable support rods are mounted on the mandrel of the tooling fixture. These support rods support and fix the inner wall of the core to be machined from the inside out. Figure 7 As shown. However, this method requires manual adjustment of the overall length of each support rod by rotating it one by one, which is not only time-consuming and labor-intensive but also inefficient, and can easily lead to problems such as poor concentricity. Utility Model Content

[0003] To address the aforementioned technical problems, this application provides a high-current bushing core tooling fixture. Through the installation of a telescopic mechanism, it avoids the inefficiency of manually adjusting the position of a single support rod in existing technologies. To achieve the above-mentioned technical features, the purpose of this utility model is as follows: A high-current bushing core tooling frame includes a hollow shaft cylinder. Two sets of support assemblies are arranged on the shaft cylinder along the axial extension direction. Each set of support assemblies includes at least three support rods evenly distributed along the circumference of the shaft cylinder. The support rods are connected to a telescopic mechanism, which drives the support rods to telescopically extend and retract along the radial direction of the shaft cylinder.

[0004] The telescopic mechanism includes a rotating disk rotatably mounted in the inner cavity of the shaft cylinder. One end of the rotating disk is provided with a planar rectangular thread. The back of the movable block, which is fitted into the mounting groove on the shaft cylinder, is provided with a threaded portion that mates with the planar rectangular thread. The movable block is connected to the support rod and is arranged in a one-to-one correspondence. The rotating disk is connected to a rotary drive unit.

[0005] The rotary drive unit includes a core rod that passes through the central hole of the rotating disk. The core rod has a protrusion that engages with a groove in the central hole.

[0006] The rotary drive unit includes a first bevel gear disposed on the side of the rotating disk opposite to the planar rectangular thread, and a second bevel gear that cooperates with the first bevel gear is mounted on the shaft via a rotating shaft, the end of the rotating shaft extending to the outside of the shaft.

[0007] The rotary drive unit includes a mandrel passing through the central hole of the rotating disk. The mandrel has a protrusion that engages with a groove in the central hole. A first bevel gear is provided on the rotating disk on the side opposite to the planar rectangular thread. A second bevel gear that engages with the first bevel gear is mounted on the shaft via a rotating shaft. The end of the rotating shaft extends to the outside of the shaft.

[0008] A locking block is installed in the mounting slot, and the locking block has a slot that is rotatably connected to the rotating disk.

[0009] The shaft includes a left cylinder and a right cylinder. Two sets of support components are respectively installed on the left cylinder and the right cylinder. An intermediate cylinder is provided between the left cylinder and the right cylinder. The intermediate cylinder is detachably connected to the left cylinder and the right cylinder.

[0010] The support rods comprise multiple sets, each set having a different length, and each support rod is detachably connected to the movable block.

[0011] The end of the support rod is equipped with a fine-tuning bolt.

[0012] The end of the fine-tuning bolt is fitted with a soft pad.

[0013] The present invention has the following beneficial effects: 1. The rotary drive unit drives the rotating disk to rotate. Under the transmission action of the planar rectangular thread, it drives multiple movable blocks and support rods on the shaft cylinder to achieve radial synchronous extension and retraction. When the rotating disk rotates, the interaction between the planar rectangular thread and the threaded part on the back of the movable block forces all the movable blocks on the same support assembly to produce equidistant displacements along the radial direction of the shaft cylinder, thereby achieving self-centering clamping, ensuring clamping coaxiality, and indirectly ensuring machining quality. 2. By setting up a telescopic mechanism, the problem of low efficiency in manually adjusting the position of a single support rod in existing technologies is avoided; 3. By setting up the left cylinder, right cylinder and middle cylinder, different lengths of the middle cylinder can be selected during use to change the overall length of the shaft cylinder, thereby meeting the clamping of sleeve cores of different lengths, making the application of this application more flexible; 4. By adjusting the extension length of the fine-tuning bolts, all support rods can stably support the inner wall of the out-of-round or deformed sleeve core, so that the sleeve core is subjected to uniform force during processing. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1A diagram showing the state of the high-current bushing core tooling provided in this embodiment of the invention when used on a lathe. Figure 2 Structural diagram of the high-current bushing core tooling frame provided in this embodiment of the utility model; Figure 3 Provided by this utility model Figure 2 Sectional view of AA; Figure 4 A front view of the rotating disk provided in an embodiment of this utility model; Figure 5 Provided by this utility model Figure 4 BB section view; Figure 6 A structural diagram of the shaft cylinder provided in an embodiment of this utility model; Figure 7 This is a structural diagram of the tooling fixture in the prior art involved in this utility model; In the figure: 1. Shaft cylinder, 1a. Mounting groove, 2. Support assembly, 3. Support rod, 4. End cap, 5. Sleeve core, 6. Rotating disk, 6a. Planar rectangular thread, 6b. Groove, 6c. First bevel gear, 7. Movable block, 7a. Threaded part, 8. Core rod, 8a. Protrusion, 9. Second bevel gear, 10. Rotating shaft, 11. Clamping block, 12. Left cylinder, 13. Right cylinder, 14. Middle cylinder, 15. Fine adjustment bolt, 16. Soft pad, 17. Machine tool chuck, 18. Machine tool center. Detailed Implementation

[0016] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0017] To achieve the above-mentioned technical features, the purpose of this utility model is as follows: See appendix Figure 1-6 A high-current bushing core fixture includes a hollow shaft cylinder 1. Two sets of support assemblies 2 are arranged along the axial direction of the shaft cylinder 1. Each set of support assemblies 2 includes at least three support rods 3 evenly distributed along the circumference of the shaft cylinder 1. The support rods 3 are connected to a telescopic mechanism, which drives the support rods 3 to extend and retract radially along the shaft cylinder 1. An end cap 4 is detachably installed at the end of the shaft cylinder 1. In use, the support rods 3 are first extended outward using the telescopic mechanism according to the bushing core 5, until the distance from the end of the support rod 3 to the axis of the shaft cylinder 1 is slightly less than the radius of the bushing core 5. Then, the bushing core 5 is fitted onto the outside of the support rod 3. The telescopic mechanism is then continued to be driven so that the end of the support rod 3 presses against the inner wall of the bushing core 5. Subsequently, the first end of the shaft cylinder 1 is clamped by a machine tool chuck 17, and the end cap 4 at the second end of the shaft cylinder 1 is held by a machine tool center 18, thus completing the clamping of the bushing core 5. By using a telescopic mechanism, the problem of low efficiency in manually adjusting the position of a single support rod 3, as is present in existing technologies, is avoided.

[0018] In one embodiment, the telescopic mechanism includes a rotating disk 6 rotatably mounted inside the cavity of the shaft cylinder 1. One end of the rotating disk 6 is provided with a planar rectangular thread 6a. A movable block 7, fitted into a mounting groove 1a on the shaft cylinder 1, has a threaded portion 7a on its back that mates with the planar rectangular thread 6a. The movable block 7 is connected to the support rod 3 and is arranged in a one-to-one correspondence. The rotating disk 6 is connected to a rotary drive unit. During operation, the rotary drive unit drives the rotating disk 6 to rotate. Under the transmission action of the planar rectangular thread 6a, multiple movable blocks 7 and support rods 3 on the shaft cylinder 1 achieve radial synchronous telescopic movement. In the design of the planar rectangular thread 6a, the thread helix angle is less than or equal to the equivalent friction angle, which gives it self-locking properties. This allows the rotating disk 6 to achieve thread self-locking when it stops rotating, thereby preventing the movable blocks 7 from loosening and ensuring that the support rod 3 stably clamps the sleeve core 5. Meanwhile, as the rotating disk 6 rotates, the interaction between the planar rectangular thread 6a and the threaded portion 7a on the back of the movable block 7 forces all the movable blocks 7 on the same support assembly to produce equidistant displacements along the radial direction of the shaft cylinder 1, thereby achieving self-centering clamping, ensuring clamping coaxiality, and indirectly ensuring machining quality.

[0019] In one embodiment, the rotary drive unit includes a core rod 8 passing through the central hole of the rotating disk 6. The core rod 8 has a protrusion 8a, which cooperates with the groove 6b on the central hole. Rotating the core rod 8 can drive the rotating disk 6 to rotate, thereby driving the support rods 3 on the two sets of support components 2 to achieve synchronous extension and retraction.

[0020] In one embodiment, the rotary drive unit includes a first bevel gear 6c disposed on the side of the rotating disk 6 opposite to the planar rectangular thread 6a. A second bevel gear 9 that cooperates with the first bevel gear 6c is mounted on the shaft cylinder 1 via a rotating shaft 10. The end of the rotating shaft 10 extends to the outside of the shaft cylinder 1. The extension and retraction of the support rod 3 can be achieved by rotating the end of the rotating shaft 10 with a wrench.

[0021] In one embodiment, the rotary drive unit includes a mandrel 8 passing through the central hole of the rotating disk 6. The mandrel 8 has a protrusion 8a that engages with a groove 6b in the central hole. A first bevel gear 6c is provided on the rotating disk 6 opposite to the planar rectangular thread 6a. A second bevel gear 9 that engages with the first bevel gear 6c is mounted on the shaft 1 via a rotating shaft 10. The end of the rotating shaft 10 extends to the outside of the shaft 1. When clamping a long sleeve core 5, two people can manually rotate the rotating shafts 10 at both ends to achieve synchronous extension and retraction of the support rod 3. The operation is more labor-saving and convenient. After the support rod 3 completes the support and clamping of the inner wall of the sleeve core 5, the mandrel 8 is removed. Then, the first end of the shaft 1 is clamped by the machine tool chuck 17, and the end cap 4 of the second end of the shaft 1 is held by the machine tool center 18, thus completing the clamping operation.

[0022] In one embodiment, a locking block 11 is installed in the mounting groove 1a. The locking block 11 is provided with a slot 11a that is rotatably connected to the rotating disk 6. Through the above structure, the rotating disk 6 can be quickly installed. During operation, the rotating disk 6 and the slot 11a form a rotational engagement.

[0023] In one embodiment, the shaft cylinder 1 includes a left cylinder 12 and a right cylinder 13. Two sets of support components 2 are respectively installed on the left cylinder 12 and the right cylinder 13. An intermediate cylinder 14 is provided between the left cylinder 12 and the right cylinder 13. The intermediate cylinder is connected to the left cylinder 12 and the right cylinder 13 respectively by fastening bolts. In use, intermediate cylinders 14 of different lengths can be selected to change the overall length of the shaft cylinder 1, thereby meeting the clamping requirements of sleeve cores 5 of different lengths, making the application of this application more flexible.

[0024] In one implementation, this embodiment includes multiple sets of support rods 3, each set having a different length, and each support rod 3 is detachably connected to the movable block 7. The use of support rods 3 of different lengths further accommodates the clamping of sleeve cores 5 of different sizes.

[0025] In one implementation method, the large-diameter casing core inevitably experiences deformation and out-of-roundness. To ensure that each support rod 3 fits snugly against the inner wall of the casing core 5, a fine-adjustment bolt 15 is provided at the end of each support rod 3. When clamping, if the fine-adjustment bolt 15 at the end of some support rods 3 cannot abut against the inner wall of the casing core 5, the corresponding fine-adjustment bolt 15 is rotated to adjust the length, thereby ensuring stable support for all support rods 3 and uniform force distribution during casing core 5 processing.

[0026] In one embodiment, the end of the fine-tuning bolt 15 is fitted with a soft pad 16, which is made of rubber. This serves to prevent damage to the inner wall of the sleeve core during contact, while also increasing the contact surface and friction coefficient, thus preventing loosening and slipping.

Claims

1. A high current can core tooling fixture, characterized by: The device includes a hollow shaft cylinder with two sets of support assemblies arranged along the axial direction. Each set of support assemblies includes at least three support rods evenly distributed along the circumference of the shaft cylinder. The support rods are connected to a telescopic mechanism, which drives the support rods to telescopically extend and retract along the radial direction of the shaft cylinder.

2. A high current can core jib tooling fixture as claimed in claim 1, wherein: The telescopic mechanism includes a rotating disk rotatably mounted in the inner cavity of the shaft cylinder. One end of the rotating disk is provided with a planar rectangular thread. The back of the movable block, which is fitted into the mounting groove on the shaft cylinder, is provided with a threaded portion that mates with the planar rectangular thread. The movable block is connected to the support rod and is arranged in a one-to-one correspondence. The rotating disk is connected to a rotary drive unit.

3. A high current can core jib tooling fixture as claimed in claim 2, wherein: The rotary drive unit includes a core rod that passes through the central hole of the rotating disk. The core rod has a protrusion that engages with a groove in the central hole.

4. A high current can core jib as claimed in claim 3, characterised in that: The rotary drive unit includes a first bevel gear disposed on the side of the rotating disk opposite to the planar rectangular thread, and a second bevel gear that cooperates with the first bevel gear is mounted on the shaft via a rotating shaft, the end of the rotating shaft extending to the outside of the shaft.

5. A high current can core jib as claimed in claim 2, characterised in that: The rotary drive unit includes a mandrel passing through the central hole of the rotating disk. The mandrel has a protrusion that engages with a groove in the central hole. A first bevel gear is provided on the rotating disk on the side opposite to the planar rectangular thread. A second bevel gear that engages with the first bevel gear is mounted on the shaft via a rotating shaft. The end of the rotating shaft extends to the outside of the shaft.

6. A high current can core jib as defined in claim 2 wherein: A locking block is installed in the mounting slot, and the locking block has a slot that is rotatably connected to the rotating disk.

7. A high current can core jib as defined in claim 1 wherein: The shaft includes a left cylinder and a right cylinder. Two sets of support components are respectively installed on the left cylinder and the right cylinder. An intermediate cylinder is provided between the left cylinder and the right cylinder. The intermediate cylinder is detachably connected to the left cylinder and the right cylinder.

8. A high-current bushing core fixture according to claim 2, characterized in that: The support rods comprise multiple sets, each set having a different length, and each support rod is detachably connected to the movable block.

9. A high current can core jib as defined in claim 1 wherein: The end of the support rod is equipped with a fine-tuning bolt.

10. A high current can core tooling fixture as defined in claim 9, wherein: The end of the fine-tuning bolt is fitted with a soft pad.

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