Thread processing tool for outlet pipe of terminal box of current transformer

Abstract

The utility model relates to the field of workpiece clamping devices of machine tools, in particular to a thread machining tool for a terminal box outlet pipe of a current transformer. The thread machining tool for the wire outlet pipe of the terminal box of the current transformer comprises a clamping rod, one end of the clamping rod is provided with a mounting plate, and the mounting plate is provided with a large flange connecting plate used for being matched with a large flange of the terminal box and a small flange connecting plate used for being matched with a small flange of the terminal box. The distance from the large flange connecting plate to the center of the outer circle of the clamping rod is equal to the distance from the end face of the large flange of the corresponding terminal box to the center of the wire outlet pipe on the outer wall of the terminal box, and the distance from the inner wall of the small flange connecting plate to the center of the outer circle of the clamping rod is equal to the distance from the end face of the small flange of the corresponding terminal box to the center of the wire outlet pipe on the outer wall of the terminal box. The thread machining tool for the wire outlet pipe of the terminal box of the current transformer can be installed on a common lathe to conduct thread machining on the wire outlet pipe on the outer wall of the terminal box, machining cost is low, and machining efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of workpiece clamping devices for machine tools, and in particular to a tooling for machining the thread of the outlet pipe of a current transformer terminal box. Background Technology

[0002] Current transformer terminal boxes are the CT (current transformer) wiring components of ultra-high voltage (UHV) electrical appliances and are indispensable and important equipment in power systems. The primary function of the current transformer terminal box is to connect and protect current transformers, enabling easy connection of current transformers to measurement and protection equipment in the power system. This simplifies power system wiring and improves the reliability and maintainability of the power system. Current transformer terminal boxes also have excellent insulation properties, ensuring safe isolation between high-voltage and low-voltage sections. This not only protects the safety of personnel but also prevents safety hazards such as fires caused by electrical faults.

[0003] Commonly used current transformer terminal boxes typically consist of a cylindrical body and large and small flanges at both ends. Outgoing conduits are installed on the outer wall of the terminal box body. To facilitate connection with equipment in the power system, external threads need to be machined on the outer circumference of the outgoing conduits. However, since the outgoing conduits are located off-center from the terminal box, the threads on the outgoing conduits usually need to be machined on a CNC machining center. This method is costly and inefficient. Therefore, a machining fixture needs to be designed to allow the terminal box to have its threads machined on a conventional lathe, eliminating the need for expensive CNC machining centers, thus reducing processing costs and improving efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a tooling for machining the thread of the terminal box output pipe of a current transformer, so as to solve the problems of high machining cost and low machining efficiency of existing machining methods.

[0005] A tooling for machining the threaded outlet pipe of a current transformer terminal box includes a clamping rod for cooperating with a three-jaw chuck on a lathe. One end of the clamping rod is fitted with an mounting plate. On the mounting plate are a large flange connecting plate for cooperating with the large flange of the terminal box and a small flange connecting plate for cooperating with the small flange of the terminal box. The distance from the large flange connecting plate to the center of the outer circle of the clamping rod is equal to the distance from the end face of the large flange of the corresponding terminal box to the center of the outlet pipe on the outer wall of the terminal box. The distance from the inner wall of the small flange connecting plate to the center of the outer circle of the clamping rod is equal to the distance from the end face of the small flange of the corresponding terminal box to the center of the outlet pipe on the outer wall of the terminal box.

[0006] Furthermore, the mounting plate and the clamping rod are connected by welding.

[0007] Furthermore, the large flange connecting plate and the small flange connecting plate are welded to the mounting plate.

[0008] Furthermore, the large flange connecting plate and the small flange connecting plate are respectively provided with through holes for bolt connection with the large flange and the small flange of the terminal box.

[0009] Furthermore, the distance from the center of the through hole on the large flange connecting plate to the end face of the large flange connecting plate away from the mounting plate is not greater than the distance from the center of the bolt hole that mates with the through hole on the large flange of the terminal box to the inner wall of the terminal box; and the distance from the center of the through hole on the small flange connecting plate to the end face of the small flange connecting plate away from the mounting plate is not greater than the distance from the center of the bolt hole that mates with the through hole on the small flange of the terminal box to the inner wall of the terminal box.

[0010] Furthermore, the end faces of both the large flange connecting plate and the small flange connecting plate that are away from the mounting plate are curved surfaces that bend toward the mounting plate.

[0011] Furthermore, the length of the large flange connecting plate is less than the length of the small flange connecting plate.

[0012] Furthermore, the sidewall and top face of the large flange connecting plate have a smooth transition, as do the sidewall and top face of the small flange connecting plate.

[0013] Furthermore, the clamping rod is a hollow circular tube.

[0014] Furthermore, the distance between the large flange connecting plate and the small flange connecting plate is equal to the distance from the outer wall of the large flange to the outer wall of the small flange of the terminal box.

[0015] Beneficial Effects: This utility model's tooling for machining the threaded outlet pipe of a current transformer terminal box is a pioneering invention. The distance from the center of the outer circle of the large flange connecting plate to the center of the clamping rod in this tooling is equal to the distance from the end face of the large flange of the corresponding terminal box to the center of the outlet pipe on the outer wall of the terminal box. Similarly, the distance from the inner wall of the small flange connecting plate to the center of the outer circle of the clamping rod is equal to the distance from the end face of the small flange of the corresponding terminal box to the center of the outlet pipe on the outer wall of the terminal box. This ensures that when the terminal box is mounted on the clamping device, the outer circle of the outlet pipe on the outer wall of the terminal box is coaxial with the outer circle of the clamping rod. This allows the outlet pipe to be threaded using a lathe tool when the terminal box is clamped on a lathe. This tooling can be installed on a conventional lathe for threading the outlet pipe on the outer wall of the terminal box, resulting in low processing costs and high processing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the tooling for machining the threaded outlet pipe of the current transformer terminal box according to this utility model.

[0017] Figure 2 for Figure 1 Right view of the embodiment;

[0018] Figure 3 for Figure 1 Left view of the embodiment;

[0019] Figure 4 for Figure 1 Assembly diagram of the embodiment and terminal box;

[0020] Figure 5 for Figure 4 The right view;

[0021] Figure 6 for Figure 4 The left view.

[0022] In the diagram: 1. Clamping rod; 2. Mounting plate; 3. Large flange connecting plate; 4. Small flange connecting plate; 5. Current transformer terminal box; 6. Large flange; 7. Small flange; 8. Through hole; 9. Outlet pipe; 10. Bolt. Detailed Implementation

[0023] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0024] The present invention relates to a fixture for machining the threaded outlet pipe of a current transformer terminal box. By setting the installation position of the connecting plate, the outlet pipe on the outer wall of the terminal box is coaxial with the clamping rod of the fixture when the current transformer terminal box is installed on the device. This allows the terminal box to be mounted on a conventional lathe for machining the outlet pipe thread, thereby reducing the machining cost.

[0025] In a basic embodiment, such as Figure 1-3 As shown, a mounting plate 2 is fixedly installed on the clamping rod 1. A large flange connecting plate 3 and a small flange connecting plate 4 are mounted on the mounting plate 2. The distance from the inner wall of the large flange connecting plate 3 or the small flange connecting plate 4 to the center of the outer circle of the clamping rod 1 is equal to the distance from the outer end face of the corresponding large flange 6 or small flange 7 of the current transformer terminal box 5 to the center of the outlet pipe 9. Figure 1 , 4 As shown, the distance A from the inner wall of the large flange connecting plate 3 to the center of the outer circle of the clamping rod 1 is the same as the distance from the outer end face of the large flange 6 of the current transformer terminal box 5 to the center of the outlet pipe 9.

[0026] In a preferred embodiment, the mounting plate 2 is welded to the clamping rod 1. The welding connection makes the overall structure of the tooling more robust and reduces the likelihood of breakage between the mounting plate 2 and the clamping rod 1. In other embodiments, bolt holes can be provided on the mounting plate 2 and the clamping rod 1, allowing for a bolt-fixed connection. This facilitates the disassembly and installation of the mounting plate 2 and the clamping rod 1, and also allows for easy replacement of the mounting plate if it deforms after long-term use, eliminating the need to replace the entire tooling and saving costs.

[0027] In a preferred embodiment, the large flange connecting plate 3 and the small flange connecting plate 4 are welded onto the mounting plate 2, which makes the structure between the large flange connecting plate 3 and the small flange connecting plate 4 and the mounting plate 2 more robust. In other embodiments, the large flange connecting plate 3 and the small flange connecting plate 4 can be integrally formed with the mounting plate 2, which ensures overall strength and improves aesthetics. The large flange connecting plate 3 and the small flange connecting plate 4 can also have flanges on their end faces. The large flange connecting plate 3 and the small flange connecting plate 4 are bolted to the mounting plate 4, which facilitates replacement of the large flange connecting plate 3 and the small flange connecting plate 4 when they are deformed or damaged.

[0028] In a preferred embodiment, through holes 8 are provided on both the large flange connecting plate 3 and the small flange connecting plate 4. The through holes 8 cooperate with the large flange 6 and the small flange 7 of the current transformer terminal box 5. The large flange connecting plate 3 and the small flange connecting plate 4 are bolted to the current transformer terminal box 5 through the through holes 8, which facilitates the installation of the current transformer terminal box 5 on the fixture. The through holes 8 can also facilitate the positioning of the current transformer terminal box 5 when it is installed on the fixture. In other embodiments, the number of through holes 8 can be set according to the specific usage to further fix the current transformer terminal box 5, so that the current transformer terminal box 5 is firmly fixed on the fixture.

[0029] In a preferred embodiment, such as Figure 5 , 6 As shown, when the current transformer terminal box 5 is installed on the tooling, the distance from the upper end face of the large flange connecting plate 3 to the center of the through hole 8 is less than the distance from the center of the bolt hole on the large flange 6 of the current transformer terminal box 5 to the inner wall of the current transformer terminal box 5, and the distance from the upper end face of the small flange connecting plate 4 to the center of the through hole 8 is less than the distance from the center of the bolt hole on the small flange 7 of the current transformer terminal box 5 to the inner wall of the current transformer terminal box 5. This avoids the central through hole of the current transformer terminal box 5, making it convenient to lift the current transformer terminal box 5 onto the lathe when machining the thread of the outlet pipe 9. In other embodiments, the large flange connecting plate 3 and the small flange connecting plate 4 can cover part of the central through hole of the current transformer terminal box 5 without affecting the lifting of the current transformer terminal box 5 or the machining of the thread of the outlet pipe 9.

[0030] In a preferred embodiment, the upper surfaces of both the large flange connecting plate 3 and the small flange connecting plate 4 are downwardly curved arc surfaces, which can completely open the central through hole of the current transformer terminal box 5 to facilitate the hoisting of the current transformer terminal box 5, and at the same time improve the overall aesthetics of the current transformer terminal box 5 after it is installed on the tooling; in other embodiments, the large flange connecting plate 3 and the small flange connecting plate 4 can also be rectangular plates, which does not affect the fixing and hoisting of the current transformer terminal box 5.

[0031] In a preferred embodiment, the length of the large flange connecting plate 3 is shorter than the length of the small flange connecting plate 4. The shorter length of the large flange connecting plate 3 ensures that it does not obstruct the central through-hole of the current transformer terminal box 5 when connected to the large flange 6 of the current transformer terminal box 5, facilitating the hoisting of the current transformer terminal box 5 onto the lathe. The length of the small flange connecting plate 4 is greater than the length of the large flange connecting plate 3. Since the small flange 7 of the current transformer terminal box 5 is smaller, the sufficient length of the small flange connecting plate 4 ensures a stable connection between it and the small flange 7 of the current transformer terminal box 5. The top of the small flange connecting plate 4 does not obstruct the central through-hole of the current transformer terminal box 5, further facilitating the hoisting of the current transformer terminal box 5 onto the lathe. In other embodiments, the length of the large flange connecting plate 3 can be equal to the length of the small flange connecting plate 4, allowing for better connection between the large flange connecting plate 3 and the small flange connecting plate 4, without affecting the hoisting of the current transformer terminal box 5.

[0032] In a preferred embodiment, the top end face of the large flange connecting plate 3 and its side wall transition smoothly, as does the top end face of the small flange connecting plate 4. This improves the aesthetics of the large flange connecting plate 3 and the small flange connecting plate 4 while ensuring safety, preventing the sharp ends of the large flange connecting plate 3 and the small flange connecting plate 4 from causing injury to workers. In other embodiments, the ends of the large flange connecting plate 3 and the small flange connecting plate 4 may not have a smooth transition, without affecting their function of fixing the current transformer terminal box 5.

[0033] In a preferred embodiment, the clamping rod 1 is a hollow cylindrical structure with a certain wall thickness to ensure its overall strength. This prevents deformation when the clamping rod 1 is clamped onto the three-jaw chuck of the lathe. The hollow cylindrical structure of the clamping rod 1 reduces the overall weight of the tooling and also lowers manufacturing costs. In other embodiments, the clamping rod 1 can be a solid cylindrical structure. A solid structure ensures overall strength, making the clamping rod 1 less prone to deformation and extending the overall service life of the tooling.

[0034] In a preferred embodiment, the distance between the large flange connecting plate 3 and the small flange connecting plate 4 is equal to the distance from the outer wall of the large flange 6 to the outer wall of the small flange 7 of the current transformer terminal box 5. This ensures that the current transformer terminal box 5 is firmly fixed to the fixture when installed between the large flange connecting plate 3 and the small flange connecting plate 4, eliminating gaps between the large flange connecting plate 3 and the small flange connecting plate 4 and the current transformer terminal box 5. This prevents the current transformer terminal box 5 from shaking during machining on the lathe, ensuring both the quality of the external thread machining of the outlet pipe 9 and safety during machining. In other embodiments, the distance between the large flange connecting plate 3 and the small flange connecting plate 4 can be slightly greater than the distance from the outer wall of the large flange 6 to the outer wall of the small flange 7 of the current transformer terminal box 5. This allows for easier installation of the current transformer terminal box 5 onto the fixture. During installation, a shim can be installed between the large flange connecting plate 3 and the small flange connecting plate 4 and the current transformer terminal box 5 to firmly fix the current transformer terminal box 5 to the fixture, preventing shaking during machining.

[0035] In the specific operation of the current transformer terminal box output pipe thread machining fixture of this utility model, the current transformer terminal box 5 is first placed between the large flange connecting plate 3 and the small flange connecting plate 4, and the large flange connecting plate 3 and the large flange 6 of the terminal box are fastened together by bolts 10, and the small flange connecting plate 4 and the small flange 7 of the terminal box are fastened together. The connected terminal box and fixture are hoisted onto the lathe as a whole, and the clamping rod 1 of the machining fixture is clamped by the three-jaw chuck of the lathe. The automatic alignment principle of the three-jaw chuck is used to realize the quick clamping and alignment of the terminal box on the lathe. The lathe is started and the external thread of the terminal box output pipe 9 is machined according to the selected parameters.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A tooling for machining the thread of the outlet pipe of a current transformer terminal box, characterized in that, The device includes a clamping rod for engaging with a three-jaw chuck on a lathe. One end of the clamping rod is fitted with a mounting plate. On the mounting plate are a large flange connecting plate for engaging with the large flange of the terminal box and a small flange connecting plate for engaging with the small flange of the terminal box. The distance from the large flange connecting plate to the center of the outer circle of the clamping rod is equal to the distance from the end face of the large flange of the corresponding terminal box to the center of the outlet tube on the outer wall of the terminal box. The distance from the inner wall of the small flange connecting plate to the center of the outer circle of the clamping rod is equal to the distance from the end face of the small flange of the corresponding terminal box to the center of the outlet tube on the outer wall of the terminal box.

2. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 1, characterized in that, The mounting plate and the clamping rod are connected by welding.

3. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 1 or 2, characterized in that, The large flange connecting plate and the small flange connecting plate are welded to the mounting plate.

4. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 1 or 2, characterized in that, The large flange connecting plate and the small flange connecting plate are respectively provided with through holes for bolt connection with the large flange and the small flange of the terminal box.

5. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 4, characterized in that, The distance from the center of the through hole on the large flange connecting plate to the end face of the large flange connecting plate away from the mounting plate is not greater than the distance from the center of the bolt hole on the large flange of the terminal box that mates with the through hole to the inner wall of the terminal box. The distance from the center of the through hole on the small flange connecting plate to the end face of the small flange connecting plate away from the mounting plate is not greater than the distance from the center of the bolt hole on the small flange of the terminal box that mates with the through hole to the inner wall of the terminal box.

6. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 5, characterized in that, The end faces of both the large flange connecting plate and the small flange connecting plate that are away from the mounting plate are curved surfaces that bend toward the mounting plate.

7. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 1 or 2, characterized in that, The length of the large flange connecting plate is less than the length of the small flange connecting plate.

8. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 1 or 2, characterized in that, The sidewall and top face of the large flange connecting plate have a smooth transition, as do the sidewall and top face of the small flange connecting plate.

9. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 1 or 2, characterized in that, The clamping rod is a hollow round tube.

10. The tooling for machining the threaded outlet pipe of the current transformer terminal box according to claim 1 or 2, characterized in that, The distance between the large flange connecting plate and the small flange connecting plate is equal to the distance between the outer wall of the large flange and the outer wall of the small flange of the terminal box.

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