A joint positioning tool for a uranium hexafluoride container assembly process

Abstract

This utility model belongs to the field of container assembly, positioning, and welding technology, and relates to a joint positioning fixture in the assembly process of a uranium hexafluoride container, specifically involving the positioning process of the joint and the end cap during container manufacturing. It includes a joint lifting and positioning mechanism, a linear module, and a flange mounting plate. The joint lifting and positioning mechanism is mounted on the linear module, and the flange mounting plate is mounted below the linear module. This utility model can automatically position and weld the joint to the end cap, improving the efficiency and quality of the welding process while reducing the labor intensity of operators.

Description

Technical Field

[0001] This utility model belongs to the field of container assembly, positioning and welding technology, and relates to a joint positioning tool in the assembly process of uranium hexafluoride containers, specifically to the positioning process of joints and heads in the container manufacturing process. Background Technology

[0002] Currently, with the continuous approval of new nuclear power plant construction projects, the demand for uranium hexafluoride (UF6) containers is increasing dramatically. At the same time, more stringent requirements are being placed on container quality, making it imperative to continuously improve the manufacturing capacity and quality of UF6 containers. UF6 containers are assembled and welded from components such as head assemblies, skirts, cylinders, flat steel rings, and lifting lugs. The head assembly is formed by welding head and joints, with the joints used to connect valves, plugs, etc. Currently, manual positioning is used to locate the joints during the welding process of the head and joints, resulting in low positioning efficiency and poor quality consistency. To improve the positioning efficiency and quality of the joints and reduce manual labor intensity, it is urgent to develop a joint positioning fixture for the assembly process of UF6 containers that can achieve automatic positioning and welding, with a high degree of automation, good reliability, and wide application scenarios. Utility Model Content

[0003] The purpose of this invention is to provide a joint positioning fixture in the assembly process of a uranium hexafluoride container, which can automatically position and weld the joint to the end cap, improve the efficiency and quality of the welding process, and reduce the labor intensity of the operators.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A joint positioning fixture for uranium hexafluoride container assembly process includes a joint lifting and positioning mechanism, a linear module, and a flange mounting plate. The joint lifting and positioning mechanism is provided on the linear module, and the flange mounting plate is provided below the linear module.

[0005] The joint lifting and positioning mechanism includes a base, guide column slider, non-metallic lifting base plate, conformal copper pad, joint top rod, positioning core frame, auxiliary lifting cylinder, and main lifting cylinder. The base has a guide column slider, which in turn has a non-metallic lifting base plate. The auxiliary and main lifting cylinders are located below the non-metallic lifting base plate. The positioning core frame is mounted on the non-metallic lifting base plate, which in turn has a conformal copper pad. The joint top rod is mounted on the conformal copper pad. The main lifting cylinder handles the initial positioning stroke of 0-100mm, while the auxiliary lifting cylinder provides an additional 50mm stroke for secondary lifting in deep holes. Through the linkage of the two cylinders, it can adapt to the hole depth requirements of different end cap specifications, with a positioning depth error ≤0.5mm. When the joint is positioned to the end cap hole, the conformal copper pad first contacts the inner surface of the end cap, and the joint angle is automatically calibrated through curved surface fitting, with an angle error ≤0.5°. The linear module uses a lead screw slide.

[0006] The structure of the ball screw slide is as follows: the motor drives the ball screw to rotate through the reducer, and the nut is connected to the slider to make linear motion on the guide rail.

[0007] The PLC sends pulse signals to adjust the motor speed and direction, and controls the displacement, speed and acceleration of the slider to achieve high-precision linear motion.

[0008] The connector is placed on the connector top rod.

[0009] The connector top rod is equipped with a ball bearing.

[0010] The beneficial effects achieved by this utility model are as follows: This invention employs a ball bearing clamping method to secure the joint, ensuring a firm fixation. A linear module is used to adjust the front and rear positions of the joint, ensuring accurate positioning. Dual-cylinder lifting achieves different lifting heights. A contouring mechanism controls the angle requirements during end cap positioning. With the aid of positioning fixtures, joint positioning is automated; the joint can be automatically positioned into the corresponding hole on the end cap without human intervention, with accurate and rapid positioning. Attached Figure Description

[0011] Figure 1 A schematic diagram of the joint positioning tooling during the assembly process of a uranium hexafluoride container; Figure 2 Schematic diagram of the joint positioning tooling and joint lifting positioning mechanism used in the assembly process of uranium hexafluoride containers; In the diagram: 1—Joint lifting and positioning mechanism; 2—Linear module; 3—Flange mounting plate; 101—Base; 102—Guide column slider; 103—Non-metallic lifting base plate; 104—Conformal copper pad; 105—Joint top rod; 106—Positioning core frame; 107—Auxiliary lifting cylinder; 108—Main lifting cylinder. Detailed implementation method. The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0012] like Figure 1 , Figure 2As shown, a joint positioning fixture in the assembly process of a uranium hexafluoride container includes a joint lifting and positioning mechanism 1, a linear module 2, and a flange mounting plate 3. The joint lifting and positioning mechanism 1 is mounted on the linear module 2, and the flange mounting plate 3 is mounted below the linear module 2. The joint lifting and positioning mechanism 1 includes a base 101, a guide column slider 102, a non-metallic lifting base plate 103, a contoured copper pad 104, a joint top rod 105, a positioning core frame 106, an auxiliary lifting cylinder 107, and a main lifting cylinder 108. The guide column slider 102 is mounted on the base 101, the non-metallic lifting base plate 103 is mounted on the guide column slider 102, the auxiliary lifting cylinder 107 and the main lifting cylinder 108 are mounted below the non-metallic lifting base plate 103, the positioning core frame 106 is mounted on the non-metallic lifting base plate 103, the contoured copper pad 104 is mounted on the positioning core frame 106, and the joint top rod 105 is mounted on the contoured copper pad 104.

[0013] The linear module 2 uses a ball screw slide. The motor drives the ball screw to rotate via a reducer, and the nut is connected to the slider, which moves linearly on the guide rail. Pulse signals are sent through control equipment such as a PLC to adjust the motor speed and direction, and to precisely control the displacement, speed and acceleration of the slider, thus achieving high-precision linear motion.

[0014] To position the connector into the corresponding hole on the end cap, the center position must be correct, and the angle must be correct. A linear module achieves precise positioning of the connector's front and rear positions. A cylinder lifts the connector to extend it into the corresponding hole on the end cap. A dual-cylinder design allows for positioning at different depths. A contouring mechanism contacts the inner surface of the end cap to adjust the angle of the connector assembly, ultimately achieving correct positioning of the connector into the corresponding hole.

[0015] The connector is placed on the connector top rod 105 by an automated mechanism, and then the ball bearings on the connector top rod 105 tighten the connector. Under the command of the control system, the linear module 2 sends the connector lifting and positioning mechanism 1 to the corresponding position of the connector hole on the end cap. Under the command of the control system, the main lifting cylinder 108 lifts the connector lifting and positioning mechanism 1, and the connector extends into the hole. If the hole is deep, a secondary lifting can be performed with the help of the auxiliary lifting cylinder 107. Then, the conformal copper pad 104 contacts the inner surface of the end cap, completing the adjustment of the connector angle.

[0016] The joint lifting and positioning mechanism includes a base, guide column slider, non-metallic lifting base plate, conformal copper pad, joint top rod, positioning core frame, auxiliary lifting cylinder, and main lifting cylinder. The base is fixed on the slider of the linear module, the guide column slider is vertically set on the base, the non-metallic lifting base plate is slidably connected to the base through the guide column slider, the auxiliary lifting cylinder and the main lifting cylinder are connected in series below the non-metallic lifting base plate and the drive end is connected to the non-metallic lifting base plate, the positioning core frame is fixed on the non-metallic lifting base plate, the conformal copper pad is embedded in the top of the positioning core frame, and the joint top rod is vertically set on the conformal copper pad. The series drive structure of the auxiliary lifting cylinder and the main lifting cylinder realizes graded lifting within the range of 0-150mm, the lifting repeatability is ≤0.5mm, and the upper surface shape of the conformal copper pad matches the bottom contour of the uranium hexafluoride container head.

[0017] The linear module adopts a ball screw slide, which uses a double guide rail support structure. The surface of the guide rail is hardened to a hardness of ≥HRC55. The double guide rails are arranged in parallel on the base of the linear module, and the slider is slidably connected to the guide rails through a ball screw nut pair.

[0018] The drive structure of the ball screw slide is as follows: the servo motor drives the ball screw to rotate through the reducer, the nut of the ball screw is fixedly connected to the slider, and the slider moves linearly along the double guide rails.

[0019] The PLC control system sends pulse signals to adjust the speed and direction of the servo motor, realizing closed-loop control of slider displacement, speed and acceleration, with a control accuracy of ≤0.05mm.

[0020] The top of the connector top rod is equipped with a ball positioning structure. The ball is embedded in the countersunk hole at the top of the connector top rod and the connector is fixed by elastic pressure.

[0021] The non-metallic lifting base is made of polytetrafluoroethylene, and a buffer rubber pad is installed between its bottom surface and the drive end of the auxiliary lifting cylinder and the main lifting cylinder.

Claims

1. A joint positioning fixture in the assembly process of a uranium hexafluoride container, characterized in that: The system includes a joint lifting and positioning mechanism, a linear module, and a flange mounting plate. The linear module is horizontally positioned above the flange mounting plate and houses the joint lifting and positioning mechanism. The joint lifting and positioning mechanism comprises a base, guide column sliders, a non-metallic lifting base plate, a contoured copper pad, a joint push rod, a positioning core frame, an auxiliary lifting cylinder, and a main lifting cylinder. The base is fixed to the slider of the linear module, the guide column sliders are vertically positioned on the base, the non-metallic lifting base plate is slidably connected to the base via the guide column sliders, the auxiliary lifting cylinder and the main lifting cylinder are connected in series below the non-metallic lifting base plate with their drive ends connected to the non-metallic lifting base plate, the positioning core frame is fixed to the non-metallic lifting base plate, the contoured copper pad is embedded in the top of the positioning core frame, and the joint push rod is vertically positioned on the contoured copper pad. The series drive structure of the auxiliary lifting cylinder and the main lifting cylinder enables graded lifting within a range of 0-150mm, with a lifting repeatability accuracy ≤0.5mm. The upper surface shape of the contoured copper pad matches the bottom contour of the uranium hexafluoride container head.

2. The joint positioning fixture in the assembly process of the uranium hexafluoride container according to claim 1, characterized in that: The linear module adopts a ball screw slide, which uses a double guide rail support structure. The surface of the guide rail is hardened to a hardness of ≥HRC55. The double guide rails are arranged in parallel on the base of the linear module, and the slider is slidably connected to the guide rails through a ball screw nut pair.

3. The joint positioning fixture in the assembly process of the uranium hexafluoride container according to claim 2, characterized in that: The drive structure of the ball screw slide is as follows: the servo motor drives the ball screw to rotate through the reducer, the nut of the ball screw is fixedly connected to the slider, and the slider moves linearly along the double guide rails.

4. The joint positioning fixture in the assembly process of the uranium hexafluoride container according to claim 3, characterized in that: The PLC control system sends pulse signals to adjust the speed and direction of the servo motor, realizing closed-loop control of slider displacement, speed and acceleration, with a control accuracy of ≤0.05mm.

5. The joint positioning fixture in the assembly process of the uranium hexafluoride container according to claim 1, characterized in that: The top of the connector top rod is equipped with a ball positioning structure. The ball is embedded in the countersunk hole at the top of the connector top rod and the connector is fixed by elastic pressure.

6. The joint positioning fixture in the assembly process of the uranium hexafluoride container according to claim 1, characterized in that: The non-metallic lifting base is made of polytetrafluoroethylene, and a buffer rubber pad is installed between its bottom surface and the drive end of the auxiliary lifting cylinder and the main lifting cylinder.

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