Automatic cutting and positioning device for valve sealing weld

Abstract

The present disclosure belongs to the field of nuclear power technology, and specifically relates to an automatic cutting and positioning device for valve sealing welds. In the present disclosure, the positioning sleeve is a cylindrical structure, and the positioning sleeve is provided with a through hole that penetrates the upper and lower surfaces of the sleeve along the axial direction. The valve stem and valve seat of the valve to be processed are located in the through hole, and each radial tightening bolt is used to limit the axial relative displacement between the positioning sleeve and the valve; each tangential tightening bolt is used to limit the relative rotation between the positioning sleeve and the valve; the end nut is threadedly connected to the upper end of the valve stem, and the lower end of the end nut is pressed against the upper surface of the positioning sleeve to limit the axial relative displacement between the positioning sleeve and the valve. In this way, stable support can be provided for the pipeline cutting equipment, thereby effectively solving the problems of difficult manual cutting of valve sealing welds in the high-temperature gas-cooled reactor helium system, unstable processing quality, and heavy workload of operators, and improving the cutting quality and efficiency of valve sealing welds.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to an automatic cutting and positioning device for valve sealing welds. Background Art

[0002] High temperature gas-cooled reactor uses helium as core coolant. As a small molecule gas, helium has very strict requirements on system sealing. Therefore, the valves of high temperature gas-cooled reactor helium system basically adopt sealing welding structure. If the valve leaks during long-term operation, a thin layer of sealing welding can be welded on the outer ring of the leaking position, which can quickly and thoroughly eliminate the risk of valve leakage. However, when the helium system valve needs to be dismantled for maintenance, it is necessary to cut and remove the sealing weld before dismantling the valve. At this time, it is required that the valve body itself should not be excessively cut when removing the sealing weld. Due to the limitation of complex interface space on site, the working space is often small. At present, manual methods such as saw blade cutting and angle grinder grinding are mostly used to cut and remove the sealing weld. Due to differences in weld height, width, surface hardness, etc., manual tool positioning is unreliable and easy to slip, and the tool is easy to break and damage. The entire sealing weld cutting and removal efficiency is low, the workload is large, and the weld removal quality is unstable, which affects the later valve welding and reinstallation. In addition, the helium system valve is located in a high-irradiation area, the operator has a long working cycle and high radiation dose, which is not conducive to radiation optimization management. Therefore, there is an urgent need to improve the efficiency and quality of removing sealing welds. Summary of the invention

[0003] In order to overcome the problems existing in the related art, a valve sealing weld automatic cutting and positioning device is provided.

[0004] According to one aspect of an embodiment of the present disclosure, a valve sealing weld automatic cutting and positioning device is provided, the valve sealing weld automatic cutting and positioning device comprising: a positioning sleeve, a plurality of radial tightening bolts, a plurality of tangential tightening bolts and an end face nut;

[0005] The positioning sleeve is a cylindrical structure, and a through hole is formed in the axial direction of the positioning sleeve, which passes through the upper and lower surfaces of the sleeve. The valve stem and valve seat of the valve to be processed are located in the through hole, and the upper end of the valve stem protrudes from the upper opening of the through hole. The bottom edge of the sleeve is pressed against the upper surface of the lower end of the valve seat.

[0006] Each radial tightening bolt is threadedly connected to the side wall of the sleeve, and the end of each radial tightening bolt inserted into the through hole presses against the side surface of the valve seat or the valve stem, and each radial tightening bolt is used to limit the radial displacement of the valve;

[0007] Each tangential tightening bolt is threadedly connected to the side wall of the sleeve, and the portion of each tangential tightening bolt that penetrates into the through hole is tangential to the valve seat, and each tangential tightening bolt is used to limit the rotation of the valve;

[0008] The end nut is threadedly connected to the upper end of the valve stem, and the lower end of the end nut is pressed against the upper surface of the positioning sleeve to limit the axial displacement of the positioning sleeve.

[0009] In a possible implementation, the shape of the inner wall of the through hole matches the outer shape of the assembly of the valve stem and the valve seat.

[0010] In a possible implementation, the inner diameter of the lower opening of the through hole is greater than the inner diameter of the upper opening.

[0011] In a possible implementation, the radial tightening bolts and the tangential tightening bolts have the same size.

[0012] In a possible implementation, the radial tightening bolts are evenly distributed on the side surface of the positioning sleeve.

[0013] In a possible implementation, the distance between the lower end of the positioning sleeve and the sealing weld of the valve is greater than 10 mm.

[0014] According to one aspect of an embodiment of the present disclosure, a processing method is provided, the method being applied to the above-mentioned valve sealing weld automatic cutting and positioning device, the method comprising:

[0015] According to the location of the sealing weld of the valve to be dismantled and the adjacent structure, measure the data required for processing and repair;

[0016] Select the pipe cutting equipment according to the measured data and the structure of the valve sealing weld;

[0017] Install the positioning device on the valve body of the valve, and continuously adjust the tightening bolts on the automatic cutting positioning device of the valve sealing weld until the coaxiality of the positioning sleeve and the valve stem meets the processing requirements;

[0018] Install and fix the fixed structure of the pipe cutting equipment to the outside of the positioning sleeve, adjust the tool of the pipe cutting equipment to face the valve sealing welding position, and adjust the pipe cutting equipment to keep the pipe cutting equipment and the valve stem coaxial;

[0019] Start the pipeline cutting equipment to cut the valve sealing weld until the sealing weld and its heat-affected zone are completely removed;

[0020] Check that the valve sealing weld is completely cut in place, and dismantle the pipeline cutting equipment and the valve sealing weld automatic cutting and positioning device.

[0021] The beneficial effects of the present disclosure are as follows: in the present disclosure, the positioning sleeve is a cylindrical structure, and the positioning sleeve is provided with a through hole axially extending through the upper and lower surfaces of the sleeve, the valve stem and the valve seat of the valve to be processed are located in the through hole, the upper end of the valve stem protrudes from the upper opening of the through hole, and the bottom edge of the sleeve is pressed against the upper surface of the lower end of the valve seat; each radial tightening bolt is threadedly connected to the side wall of the sleeve, and the end of each radial tightening bolt protruding into the through hole is pressed against the side surface of the valve seat or the valve stem, and each radial tightening bolt is used to limit the axial relative displacement between the positioning sleeve and the valve; each tangential tightening bolt is threadedly connected to the side wall of the sleeve, and the part of each tangential tightening bolt protruding into the through hole is tangential to the valve seat, and each tangential tightening bolt is used to limit the relative rotation between the positioning sleeve and the valve; the end nut is threadedly connected to the upper end of the valve stem, and the lower end of the end nut is pressed against the upper surface of the positioning sleeve, which is used to limit the axial relative displacement between the positioning sleeve and the valve. This can provide stable support for the pipeline cutting equipment, thereby effectively solving the problems of difficult manual cutting of valve sealing welds in the high-temperature gas-cooled reactor helium system, unstable processing quality, and heavy workload for operators, and improving the cutting quality and efficiency of valve sealing welds. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a valve sealing weld automatic cutting and positioning device according to an exemplary embodiment.

[0023] Figure 2 It is a schematic diagram of a valve sealing weld automatic cutting and positioning device according to an exemplary embodiment.

[0024] Figure 3 is a schematic diagram of a valve according to an exemplary embodiment. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 It is a schematic diagram of a valve sealing weld automatic cutting and positioning device according to an exemplary embodiment. Figure 3 FIG. 1 is a schematic diagram of a valve according to an exemplary embodiment. Figure 1 and Figure 3As shown, the valve sealing weld automatic cutting and positioning device includes a positioning sleeve 201, two upper and lower groups of radial tightening bolts 202, two upper and lower groups of tangential tightening bolts 203 and end nuts 204, wherein the radial tightening bolts 202 and the tangential tightening bolts 203 can be designed as a universal interchangeable structure. The positioning sleeve 201 is a hollow cylindrical structure, in which the lower end opening is large and the upper end opening is small. The inner wall shape of the through hole of the positioning sleeve 201 is compatible with the outer shape of the valve stem 103 and the valve seat 102 of the valve 1. The valve stem 103 and the valve seat 102 can pass through the through hole. The positioning sleeve 201 is mounted on the valve seat 102, and its lower end is at least 10 mm higher than the sealing weld 101 of the valve 1. The positioning sleeve 201 can be processed and formed by higher strength materials such as stainless steel or aluminum alloy; the radial tightening bolts 202 and the tangential tightening bolts 203 can be stainless steel tightening screws to ensure sufficient supporting strength; the end nut 204 can be processed by stainless steel, and the thread specification matches the upper thread of the valve stem 103 of the valve 1.

[0027] Figure 2 is a schematic diagram of a valve sealing weld automatic cutting and positioning device according to an exemplary embodiment, referring to Figure 2 In one application example, the following operations can be performed:

[0028] Step 1, install the positioning sleeve 201 of the positioning device 2 on the valve 1, and use a caliper or other measuring tool to evenly measure at least points on the circumference of the valve stem, and check whether the positioning device 2 is coaxial with the valve seat 102 through the measurement data. If the size deviation is large, adjust the radial tightening bolt 202 on the positioning device 2 until the coaxiality meets the processing requirements, and then fix the tangential tightening bolt 203, and finally install the end nut 204 to the upper threaded section of the valve stem 103 of the valve 1, and tighten it;

[0029] Step 2: Install the pipe cutting device 3 and the cutting tool 301, adjust the position of the tool to the position of the valve sealing weld 101, and also adjust the pipe cutting device 3 to keep it coaxial with the valve seat 102;

[0030] Step 3, start the pipeline cutting device 3 to cut the valve sealing weld 101 until the sealing weld 101 and its heat-affected zone are completely removed;

[0031] Step 4: Check that the valve sealing weld 101 is completely cut in place, and disassemble the pipeline cutting equipment 3 and the positioning device 2.

[0032] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A valve sealing weld automatic cutting and positioning device, characterized in that: The valve sealing weld automatic cutting and positioning device comprises: a positioning sleeve, a plurality of radial tightening bolts, a plurality of tangential tightening bolts and an end face nut; The positioning sleeve is a cylindrical structure, and a through hole is formed in the axial direction of the positioning sleeve, which passes through the upper and lower surfaces of the sleeve. The valve stem and valve seat of the valve to be processed are located in the through hole, and the upper end of the valve stem protrudes from the upper opening of the through hole. The bottom edge of the sleeve is pressed against the upper surface of the lower end of the valve seat. Each radial tightening bolt is threadedly connected to the side wall of the sleeve, and the end of each radial tightening bolt inserted into the through hole presses against the side surface of the valve seat or the valve stem, and each radial tightening bolt is used to limit the axial relative displacement between the positioning sleeve and the valve; Each tangential jacking bolt is threadedly connected to the side wall of the sleeve, and the portion of each tangential jacking bolt that penetrates into the through hole is tangential to the valve seat. Each tangential jacking bolt is used to limit the relative rotation between the positioning sleeve and the valve. The end nut is threadedly connected to the upper end of the valve stem, and the lower end of the end nut is pressed against the upper surface of the positioning sleeve to limit the axial relative displacement between the positioning sleeve and the valve; The inner wall shape of the through hole is adapted to the outer shape of the assembly of the valve stem and the valve seat; The inner diameter of the lower opening of the through hole is greater than the inner diameter of the upper opening.

2. The valve sealing weld automatic cutting and positioning device according to claim 1, characterized in that: The radial tightening bolts and the tangential tightening bolts have the same size.

3. The valve sealing weld automatic cutting and positioning device according to claim 1, characterized in that: The radial tightening bolts are evenly distributed on the side surface of the positioning sleeve.

4. The valve sealing weld automatic cutting and positioning device according to claim 1, characterized in that: The distance between the lower end of the positioning sleeve and the sealing weld of the valve is greater than 10 mm.

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