Device for processing guide key pin hole of in-core structure

Abstract

The present application belongs to processing device, specifically relates to a kind of in-pile component guide key pin hole processing device.A kind of in-pile component guide key pin hole processing device, wherein, including fixed clamping device and adjustable clamping device, wherein fixed clamping device is used for the fixation and clamping of pressure vessel support block, and adjustable clamping device is used for the fine adjustment of pressure vessel support block position.The remarkable effect of the present application is: the present application is suitable for the installation construction work of the narrow internal space, complex structure, high machining precision, magnetic drill is not easy to adsorb and the surrounding of drilling area has no supporting structure.The present application improves the in-pile component guide key positioning pin hole processing quality, improves the safety, reliability of drilling equipment operation.The present application improves the work efficiency of on-site drilling processing.

Description

TECHNICAL FIELD

[0001] The application belongs to processing device, and particularly relates to a device for processing guide key pin hole of in-core component. BACKGROUND

[0002] The nuclear reactor pressure vessel and the in-core component are the most critical equipment in the nuclear equipment, the in-core component is installed in the interior of the pressure vessel, and the in-core component is divided into an upper in-core component and a lower in-core component; during installation of the lower in-core component, a horizontal positioning pin hole is processed on a radial support block in the interior of the pressure vessel, a U-shaped embedded key is fixed to the support block through a cold mounting pin, and the lower in-core component is guided and limited in the radial and axial directions when the lower in-core component is installed in the interior of the pressure vessel. At present, the horizontal drilling technology in the interior of the pressure vessel of the nuclear power plant is mature, but the structure of the pressure vessel and the in-core component of the Jiagang Phase II project is different from that of the pressure vessel and the in-core component of the nuclear power plant, the guide key of the in-core component is fixed to the support block of the pressure vessel through a cold mounting pin, and the vertical positioning pin hole is processed on the upper surface of the support block of the pressure vessel, the pin hole processing fit tolerance is H7(0 0.015 ) / s6( 0.023 0.032 ), the precision requirement is high, and the interference amount is large; the material of the support block is 022Cr19Ni10N, the outer shape structure size is small, and the surrounding space position cannot be fixed, the diameter of the interior of the pressure vessel cylinder is small, about 2000 mm, and the drilling equipment cannot be fixed; therefore, a device for processing the guide key pin hole of the in-core component is needed, the drilling equipment is fixed firmly and reliably around the support block, the on-site drilling and processing work of the pin hole of the support block is realized, and the processing quality and precision of the pin hole meet the design requirements. SUMMARY

[0003] The application provides a device for processing the guide key pin hole of the in-core component.

[0004] The application is implemented as follows: a device for processing the guide key pin hole of the in-core component, wherein the device comprises a fixed clamping device and an adjustable clamping device, the fixed clamping device is used for fixing and clamping the support block of the pressure vessel, and the adjustable clamping device is used for fine adjustment of the position of the support block of the pressure vessel.

[0005] The device for processing the guide key pin hole of the in-core component as described above, wherein the fixed clamping device comprises an upper plate, a bottom plate and a support plate arranged between the upper plate and the bottom plate.

[0006] The device for processing the guide key pin hole of the in-core component as described above, wherein the support plate comprises two parallel support plates, the support block of the pressure vessel is arranged between the two support plates, a square through hole is arranged in the upper plate, and the position of the through hole matches the position of the support block of the pressure vessel.

[0007] The device for machining the guide key pin hole of the in-pile component as described above, wherein a side plate is further arranged below the upper plate, the side plate being perpendicular to the plane where the upper plate is located, and the side plate being also perpendicular to the plane where the supporting plate is located.

[0008] The device for machining the guide key pin hole of the in-pile component as described above, wherein an M16 adjusting bolt assembly is further arranged between the upper plate and the bottom plate, the M16 adjusting bolt assembly being used for fastening the upper plate and the bottom plate.

[0009] The device for machining the guide key pin hole of the in-pile component as described above, wherein the adjustable clamping device comprises an adjustable support, the adjustable support comprising a telescopic rod and a supporting surface, the supporting surface being arranged in parallel with the side plate, and the telescopic rod being fixedly connected with the supporting surface.

[0010] The device for machining the guide key pin hole of the in-pile component as described above, wherein the device is made of Q235B.

[0011] The remarkable effect of the present application is that the present application is suitable for installation and construction work in a narrow internal space of a container, a complex structure, high machining precision, difficulty in adsorption of a magnetic electric drill, and no supporting structure around a drilling area. The present application improves the machining quality of the guide key positioning pin hole of the in-pile component, and improves the safety and reliability of the operation of the drilling equipment. The present application improves the work efficiency of on-site drilling machining.

[0012] Specifically:

[0013] (1) Each component of the present application is a common material used in the construction site, and the manufacturing cost is low.

[0014] (2) The present application has a simple structure, and the installation and removal process is simple and convenient to operate. The device can be fixed by tightening the bolt fastener with a wrench. When in use, the device is installed at the supporting block position, adjusted and fixed by the bolt assembly in each direction, the levelness of the magnetic electric drill installation position surface is measured and monitored by the frame type level, and the radial limiting and fixing of the device is realized by using the improved adjustable support of the scaffold, so as to increase the stability and prevent the loosening or shifting under stress.

[0015] (3) The present application ensures the quality of drilling construction, improves the stability of drilling equipment installation, improves the machining precision, improves the work efficiency, and reduces the construction quality and safety risk. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Schematic view of the supporting block position in the pressure container;

[0017] Figure 2 Schematic view of the assembly of the guide key of the in-pile component and the supporting block;

[0018] Figure 3Device for guiding key pin hole processing of in-pile component

[0019] In the figure: 1, upper plate; 2, M16 adjusting bolt assembly; 3, bottom plate; 4, support plate; 5, side plate; 6, adjustable support; 7, pressure vessel support block installation position; 8, pressure vessel cylinder assembly; 9, support block; 10, pressure vessel bottom plate; 11, welding point; 12, positioning pin hole; 13, guide key DETAILED DESCRIPTION

[0020] The device for guiding key pin hole processing of in-pile component is shown in Figure 3 The device is mainly composed of one upper plate, one bottom plate, two support plates, one side plate, and one adjustable support. The components are connected by M16 screw and nut. The upper plate and the bottom plate fix the device vertically on the support block. The side plate and the support plate fix the device horizontally on the support block. The adjustable support fixes the device in front and back directions on the support block by fixing one end of the adjustable support to the side plate of the device and the other end to the inner wall of the pressure vessel. Finally, the stability and safety of the drilling device are ensured. The device is made of Q235B. To prevent pollution caused by direct contact between the support block and the guide key, the entire outer surface of the device is painted. The bottom paint is blue, and the top paint is red. The upper plate and the support block, and the adjustable support and the inner wall of the pressure vessel are effectively isolated by stainless steel gaskets. Before processing the positioning pin hole, place the magnetic drill on the device for guiding key pin hole processing of in-pile component. Adjust and fix the device by the bolt assembly under the cooperation of the frame leveler, so that the center axis of the drill bit is perpendicular to the surface of the support block. Start the magnetic drill. Check the dial indicator. If the dial indicator pointer does not change, the device has been adjusted stably and reliably. Then, the positioning pin hole processing of the guide key can be carried out.

[0021] The pressure vessel support block and the guide key pin hole are drilled once and qualified. The surface of the positioning pin hole is smooth, and the deviation from the theory is only 0.02 mm, which is much smaller than the design requirement deviation. This lays a solid foundation for the one-time successful installation of the positioning pin cold assembly of the guide key.

[0022] The device for guiding key pin hole processing of in-pile component makes full use of the structure of the pressure vessel and the structural characteristics of the pressure vessel support block. The device is effectively fixed to the support block and adjusted and fixed in multiple directions of X / Y / Z axes, which increases the stability of the device. Under the cooperation of the frame leveler, the device is accurately adjusted by the bolt assembly set on the X / Y / Z axes, which ensures the installation accuracy of the magnetic drill, the perpendicularity of the drill bit of the magnetic drill to the processing surface, the stability of the magnetic drill operation, and the processing accuracy of the pin hole, providing a guarantee for the smooth installation of the cold assembly pin.

[0023] The device for processing the guide key pin hole of the in-core component has simple structure and simple operation, reduces labor input, improves work efficiency and construction cost, and improves the processing quality of the positioning pin hole.

Claims

1. An apparatus for machining a guide key pin hole of an in-core structure, characterized by: The fixed clamping device is used for fixing and clamping the pressure container support block, and the adjustable clamping device is used for fine adjustment of the position of the pressure container support block; The fixed clamping device comprises an upper plate (1), a bottom plate (3) and a supporting plate (4) arranged between the upper plate (1) and the bottom plate (3); The supporting plate (4) is shared by two plates and is arranged in parallel, and a pressure container support block mounting position (7) is arranged between the two supporting plates (4); a square through hole is formed in the upper plate (1) and is arranged at a position matched with the position of the pressure container support block mounting position (7); A side plate (5) is further arranged below the upper plate (1), and the side plate (5) is perpendicular to the plane where the upper plate (1) is arranged and is also perpendicular to the plane where the supporting plate (4) is arranged; An M16 adjusting bolt assembly (2) is further arranged between the upper plate (1) and the bottom plate (3), and the M16 adjusting bolt assembly (2) is used for fastening the upper plate (1) and the bottom plate (3); The adjustable clamping device comprises an adjustable support (6), and the adjustable support (6) comprises a telescopic rod and a supporting surface; the supporting surface is arranged in parallel with the side plate (5), and the telescopic rod is fixedly connected with the supporting surface; The device material for in-pile component guide key pin hole machining is Q235B.

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