Weld cutting device

Abstract

The present invention relates to the technical field of cutting devices, and particularly to a welding seam cutting device. In the technical solution of the present application, it includes a base, a cutting member, two adjusting members and a plurality of rolling members. The cutting member is installed on the base, the adjusting members are connected to the base and the rolling members, and the two adjusting members are symmetrically arranged about the center line. Such a structure enables the cutting device to be better installed on the circular welding seam and more stable, so as to control the cutting process. Among them, the accommodating groove of the rolling member accommodates a part of the circular welding seam along the circumferential direction of the circular welding seam, so as to be able to guide the base to rotate circumferentially around the circular welding seam, and further enable the cutting member to cut the circular welding seam under the drive of the base, and can avoid the situation of too deep or too shallow cutting depth. In this way, the cutting quality is improved, and the valve can be prevented from being accidentally damaged and scrapped.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting devices, and particularly to a weld cutting device. Background Art

[0002] During the engineering construction and operation and maintenance stages of nuclear power plants, it is often necessary to disassemble and overhaul the valve cover and valve body welded together. The process of disassembly and overhaul mainly includes steps such as cutting, disassembling the valve, grinding the sealing surfaces of the valve body and valve cover, testing, assembling, and re-welding. Among them, the cutting stage refers to cutting the circumferential weld that welds the valve cover and valve body together, which is the most risky link. Since the cutting process is difficult to control, it is easy to have the situation of too deep or too shallow cutting depth, resulting in low cutting quality, accidentally damaging the valve, and causing the valve to be scrapped. Summary of the Invention

[0003] Based on this, in view of the problems of low cutting quality and accidental damage to the valve during the cutting process, it is necessary to provide a weld cutting device.

[0004] The present application provides a cutting device for cutting a circumferential weld, including: a base and a cutting member. The base has a center line perpendicular to the plane where the circumferential weld is located. The cutting member is arranged on the base, and two adjusting members. Each adjusting member has a first end and a second end arranged oppositely along the longitudinal direction. The first end of each adjusting member is detachably connected to the base. The two adjusting members are symmetrically arranged about the center line, and the two first ends face each other and are not connected to each other. The two second ends extend obliquely away from each other, and a plurality of rolling members. Part of the rolling members among all the rolling members are rotatably arranged on the base, and the other part of the rolling members are rotatably arranged at the second ends of the adjusting members.

[0005] Wherein, a receiving groove is provided in the circumferential direction of all the rolling members. The receiving groove is used to receive a part of the circumferential weld along the circumferential direction of the circumferential weld, so as to be able to guide the base to rotate around the circumferential direction of the circumferential weld, so that the cutting member cuts the circumferential weld under the drive of the base.

[0006] In the technical solution of the present application, the cutting member is installed on the base. The adjusting members are connected to the base and the rolling members. The two adjusting members are symmetrically arranged about the center line, and the first end of the adjusting member is closer to the center line than the corresponding second end of the first end. Such a structure enables the cutting device to be better installed on the circumferential weld and more stable, so as to control the cutting process. The receiving groove of the rolling member can receive a part of the circumferential weld along the circumferential direction of the circumferential weld, and further can guide the base to rotate around the circumferential direction of the circumferential weld, so that the cutting member cuts the circumferential weld under the drive of the base, and can avoid the situation of too deep or too shallow cutting depth. Thus, the cutting quality is improved, and the situation of accidentally damaging the valve and causing the valve to be scrapped can be avoided.

[0007] In one embodiment, the annular weld has an axis, and the cutting element's cutting direction is parallel to the axis. Thus, because the cutting device is positioned around the annular weld, the cutting element's cutting direction is parallel to the axis, and the cutting element's cutting range is limited to the portion of the annular weld that protrudes from the valve. This prevents the cutting element from contacting the valve, thus preventing accidental cutting of the valve.

[0008] In one embodiment, the cutting piece is detachably mounted on the base, so that different cutting pieces can be easily replaced according to the actual cutting situation.

[0009] In one embodiment, the cutting device further comprises a first mounting member detachably connected to the base, and the cutting member is detachably connected to the first mounting member, so that different first mounting members can be easily replaced to replace different cutting members for adapting to different working environments.

[0010] In one embodiment, the first mounting member is provided with a mounting groove for accommodating a portion of the cutting member, so as to facilitate replacement of different cutting members in the first mounting member during use.

[0011] In one embodiment, all rolling elements are arranged symmetrically about the center line. In this way, the cutting device can be balanced when in use and can avoid tilting to one end and causing the base to deviate from the annular weld.

[0012] In one embodiment, four rolling elements are provided, two of which are rotatably mounted on the base, one of the other two rolling elements is rotatably mounted on the second end of one of the two adjusting elements, and the other of the other two rolling elements is rotatably mounted on the second end of the other of the two adjusting elements. In this manner, the rolling elements can better guide the base in circumferential rotation about the annular weld, thereby preventing the base from deviating from the annular weld.

[0013] In one embodiment, the cutting device further includes a second mounting member disposed at the second end of the adjusting member, and a rolling member disposed at the second end of the adjusting member is rotatably connected to the second mounting member. This makes the overall structure more flexible and facilitates the rolling member to drive the adjusting member to rotate.

[0014] In one embodiment, a first accommodating cavity is defined within the second mounting member. A portion of a rolling element disposed at the second end of the adjusting member is accommodated within the first accommodating cavity, while the remaining portion is exposed outside the first accommodating cavity. This minimizes contact between the second mounting member and the annular weld while ensuring a secure connection between the rolling element and the adjusting member, thereby preventing the second mounting member from interfering with the circumferential rotation of the rolling element guide base about the annular weld.

[0015] In one embodiment, the first end of the adjusting member is threadedly connected to the base so as to be able to adjust the position of the adjusting member along the extending direction of the adjusting member, where the extending direction of the adjusting member is the direction from the first end of the adjusting member to the second end of the adjusting member. In this way, the adjusting member can be adjusted according to the actual working conditions.

[0016] In one embodiment, the cutting device further includes an operating member provided on the base to provide a fulcrum for acting. In this way, it is convenient for the operator to operate the cutting device.

[0017] In one embodiment, the operating member is detachably connected to the base. In this way, the operating member can be replaced according to the actual working conditions.

[0018] In one embodiment, there are two operating members, and the two operating members are symmetrically arranged about the center line. In this way, it is convenient to control the cutting device and enable the rolling member to better guide the circumferential rotation of the base around the circumferential weld.

[0019] In one embodiment, the base includes a body portion and extension portions provided at opposite ends of the body. The body portion has a first sub-portion and second sub-portions provided at both ends of the first sub-portion; the first sub-portion and the two second sub-portions enclose a groove for accommodating a part of the circumferential weld, and the rolling member provided on the base is rotatably provided on the second sub-portion; one of the two extension portions is connected to one of the two second sub-portions, and the other of the two extension portions is connected to the other of the two second sub-portions; the first end of one of the two adjusting members is detachably connected to one of the two extension portions, and the first end of the other of the two adjusting members is detachably connected to the other of the two extension portions. In this way, the rolling member can guide the circumferential rotation of the base around the circumferential weld and enable the base to drive the adjusting member to rotate synchronously.

[0020] In one embodiment, a second accommodation cavity is provided in the second sub-portion, and a part of the rolling member provided on the base is accommodated in the second accommodation cavity, and the other part is exposed outside the second accommodation cavity. In this way, the rolling member separates the base from the circumferential weld by a certain distance, avoiding the base from affecting the circumferential rotation of the rolling member guiding the base around the circumferential weld.

[0021] Additional aspects and advantages of the embodiments of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the installation diagram of the cutting device in one embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the cutting device in one embodiment of the present application installed on the weld connecting the valve cover and the valve body;

[0024] Figure 3 This is a top view of the cutting device installed on the weld in an embodiment of the present application.

[0025] The reference numerals are as follows:

[0026] Base 100, first mounting member 110, mounting groove 111, body portion 120, first sub-portion 121, second sub-portion 122, second accommodating cavity 1221, extension portion 130;

[0027] Cutting member 200;

[0028] Adjusting member 300, first end 310, second end 320;

[0029] Rolling member 400, accommodating groove 410;

[0030] Second mounting member 500, first accommodating cavity 510;

[0031] Operating member 600;

[0032] Center line a, axis b;

[0033] Circular weld 20. Detailed implementation manners

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following describes the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In the present invention, unless otherwise clearly defined and limited, the terms such as "installed", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0040] Due to the radioactive irradiation characteristics of its use environment, especially for nuclear class I valves, if a valve leaks, especially an external leak at the connection between the valve body and the valve cover, it will cause irradiation risks during the maintenance process.

[0041] To address the above problems, in nuclear power plants, the valve cover and the valve body are welded together to reduce the risk of external leakage. The main objects of use are two types: globe valves and check valves. By welding the valve body and the valve cover together, a relatively thin sealed circumferential weld is formed, thereby preventing radioactive media from leaking out through the body cover gap and effectively reducing the irradiation leakage risk.

[0042] During the engineering construction and operation and maintenance phases of a nuclear power plant, it is often necessary to disassemble and overhaul the valve cover and valve body welded together as described above. The process of disassembly and overhaul mainly includes steps such as cutting, disassembling the valve, grinding the sealing surfaces of the valve body and valve cover, testing, assembling, and re-welding. Among them, the cutting stage refers to cutting the circumferential weld that welds the valve cover and valve body together. Since the circumferential weld is relatively thin, a relatively high risk will be generated during the process of cutting the circumferential weld.

[0043] The inventors of the present application have noticed that currently, the method of cutting the circumferential weld is mostly by using a hand saw blade, which has low labor efficiency and mainly relies on the operator's experience. During the cutting process, it is easy to have the situation of too deep or too shallow cutting depth, resulting in low cutting quality, accidentally damaging the valve, and causing the valve to be scrapped.

[0044] In the related art, a series of devices are fixed on the valve body, and the electric milling cutter is visually adjusted to be centered and the cutting work is completed around the axis of the device. However, this method has a large volume of the fixing device and is not suitable for scenarios with a narrow space. Moreover, it is easy to generate deviations by visually adjusting the electric milling cutter, resulting in the cutting position not being in the center of the weld, and the valve will be accidentally damaged.

[0045] In order to avoid accidentally damaging the valve during the cutting process, the inventors of the present application have studied and found that by setting rolling members to guide the cutting device to rotate circumferentially around the circumferential weld, the cutting member can cut the circumferential weld circumferentially around the circumferential weld, so that the cutting process can be controlled, the situation of too deep or too shallow cutting depth can be avoided, thereby improving the cutting quality, and the valve can be prevented from being accidentally damaged and scrapped.

[0046] The following further describes the cutting device provided by the present application in combination with the relevant drawings and some embodiments of the present application.

[0047] Figure 1 Shows the installation diagram of the cutting device; Figure 2 Shows the diagram of the cutting device installed on the weld connecting the valve cover and the valve body; Figure 3 Shows the top view of the cutting device installed on the weld.

[0048] In some embodiments of the present application, please refer to Figure 1 and Figure 2, a cutting device provided by an embodiment of the present application includes a base 100, a cutting member 200, two adjusting members 300, and a plurality of rolling members 400. The base 100 has a center line a, and the center line a is perpendicular to the plane where the circumferential weld 20 is located. The cutting member 200 is arranged on the base 100. The adjusting member 300 has a first end 310 and a second end 320 arranged oppositely along the longitudinal direction. The first end 310 of the adjusting member 300 is detachably connected to the base 100. The two adjusting members 300 are symmetrically arranged with respect to the center line a, and the first ends 310 of the two adjusting members 300 are arranged facing each other and are not connected to each other. The second ends 320 of the two adjusting members 300 extend obliquely away from each other. That is to say, the first end 310 is closer to the center line than the corresponding second end 320 of the first end 310. Among all the rolling members 400, a part of the rolling members 400 are rotatably arranged on the base 100, and another part of the rolling members 400 are rotatably arranged on the second end 320 of the adjusting member 300.

[0049] Among them, the above-mentioned "base 100" refers to a structure that can accommodate the cutting member 200, the first mounting member 110, and part of the rolling members 400, and can be connected to the adjusting member 300 and the operating member 600. When the rolling member 400 rotates, it can drive the base 100 to rotate, and the base 100 then drives the operating member 600 to rotate, so that the device operates.

[0050] The "cutting member 200" refers to a component that can cut the weld. Optionally, the cutting member 200 can be components such as a fine cutting tool, and no further limitation is made here.

[0051] The "adjusting member 300" refers to a component that can adjust its extending direction through the first end 310 or the second end 320 of the adjusting member 300. Optionally, the adjusting member 300 can be rod-shaped or other shapes, and no further limitation is made here. The "first end 310" refers to the end of the adjusting member 300 connected to the base 100, and the "second end 320" refers to the end opposite to the first end 310.

[0052] "The first ends 310 of the two adjusting members 300 are arranged facing each other and are not connected to each other, and the second ends 320 of the two adjusting members 300 extend obliquely away from each other" means that the distance between the first ends 310 of the two adjusting members 300 is shorter than the distance between the second ends 320 of the two adjusting members 300.

[0053] The "rolling member 400" refers to a component that can roll on the circumferential weld 20. Optionally, the rolling member 400 can be a wheel structure, and no further limitation is made here.

[0054] The "center line a" refers to the line about which the base 100 is symmetric, and the valve is symmetric about the center line a.

[0055] Please continue to refer to Figure 1 and Figure 2 A receiving groove 410 is circumferentially arranged on all the rolling members 400. The receiving groove 410 is used to receive a part of the circumferential annular weld 20 along the circumferential direction of the annular weld 20, so as to guide the base 100 to rotate circumferentially around the annular weld 20, so that the cutting member 200 cuts the annular weld 20 under the drive of the base 100.

[0056] It can be understood that the outer surface of the receiving groove 410 can be fitted with the annular weld 20, so that the rolling member 400 is directly mounted on the weld, and the rolling member 400 can rotate circumferentially along the annular weld 20. Since a part of the rolling member 400 is mounted on the base 100, the base 100 can be driven to rotate circumferentially around the annular weld 20. Since the cutting member 200 is arranged in the base 100, the base 100 can also drive the cutting member 200 to rotate circumferentially along the annular weld 20 to cut the weld, so that the cutting process is controlled, and the situation of accidentally injuring the valve due to the cutting position deviating from the center of the weld is avoided. In the related art, in order to facilitate the feeding and observing the cutting state, the fixing device is usually not directly applied to the weld. However, the design of the receiving groove 410 here can enable the fixing device to be well arranged on the weld without affecting the observation of the cutting state and the feeding. And only the rolling member 400 and the cutting member 200 of the whole cutting device can be close to the weld, and other structures keep a certain distance from the weld, so as to avoid other structures touching the weld during cutting and affecting the cutting process.

[0057] In the related art, when designing a cutting device, an electric device is usually used for cutting to save time and labor. However, an electric device usually requires a complex and large power mechanism and needs to be fixed on the valve body to be firm. However, this method is only applicable to the working conditions with a large working space and cannot meet the working conditions with a small working space. The inventor of the present application adopts a manual cutting method. Through the design that the rolling member 400 is directly mounted on the weld to drive the base 100 and thus drive the cutting member 200 to cut, the whole cutting device is relatively small and can meet the working conditions with a small working space, and at the same time, a good cutting effect can be achieved.

[0058] The inventor of the present application further notes that, in order to expose the weld as soon as possible, the related art usually adopts a radial feeding method for cutting. Radial feeding means that the feeding direction is perpendicular to the axis b. During this process, the cutting member 200 may be misaligned, so that the cutting range exceeds the weld, and there is a risk of accidentally cutting the valve.

[0059] In order to avoid accidentally cutting the valve during the cutting process, in some embodiments of the present application, please refer to Figure 2The circumferential weld 20 has an axis b, and the feed direction of the cutting member 200 is parallel to the axis b. That is to say, the cutting is performed in a vertical feed manner. In this way, the cutting member 200 cuts the weld from top to bottom. The cutting member 200 is perpendicular to the valve. Since the cutting device is arranged around the circumferential weld 20, it can avoid contacting the valve. The cutting range is only on the circumferential weld 20 protruding from the valve, and the situation of accidentally cutting the valve can be avoided.

[0060] In some embodiments of the present application, please continue to refer to Figure 1 The cutting member 200 is detachably arranged on the base 100. Further, the cutting device further includes a first mounting member 110 detachably connected to the base 100, and the cutting member 200 is detachably connected to the first mounting member 110. The detachable connection facilitates replacing different cutting members 200 according to the actual cutting situation. Optionally, the first mounting member 110 can be radially inserted into the base 100 and fixed to the base 100 with screws to prevent displacement during the cutting process. Since the rolling member 400 is directly mounted on the weld, the base 100 can be made very thin to relieve the limitation of the valve shape. The above-mentioned operator, for the convenience of feeding and observing the cutting state, will not directly apply the fixing device to the weld, but in the embodiments of the present application, the rolling member 400 is directly mounted on the weld, so that the cutting member 200 is directly centered with the weld, and there is no need to observe the feeding and cutting states.

[0061] In some embodiments of the present application, the first mounting member 110 is provided with a mounting groove 111 for accommodating a part of the cutting member 200. It can be understood that the existence of the mounting groove 111 facilitates placing the cutting member 200. Optionally, the structure of the mounting groove 111 is convex to facilitate matching with the base 100.

[0062] In some embodiments of the present application, all the rolling elements 400 are symmetrically arranged with respect to the center line a. Further, there are four rolling elements 400. Two of the rolling elements 400 are rotatably arranged on the base 100, and one of the other two rolling elements 400 is rotatably arranged at the second end 320 of one of the two adjusting elements 300, and the other of the other two rolling elements 400 is rotatably arranged at the second end 320 of the other of the two adjusting elements 300. The rolling elements 400 are designed in this way so that the cutting device can be balanced during use, and it can avoid tilting towards one end and causing the base 100 to deviate from the circumferential weld 20. Moreover, by arranging two rolling elements 400 on the base 100 and two rolling elements 400 at the second ends 320 of the adjusting elements 300, it can better guide the base 100 to rotate circumferentially around the circumferential weld 20 and avoid the situation where the base 100 deviates from the circumferential weld 20. The inventors of the present application have noticed that generally the cutting tool has a large volume and cannot be flexibly adjusted in size to adapt to valves of different calibers. Therefore, based on the above considerations, in the embodiments of the present application, by adjusting the length of the adjusting element 300, different-caliber valves can be adapted while fixing the cutting device.

[0063] In some embodiments of the present application, the cutting device further includes a second mounting member 500. The second mounting member 500 is arranged at the second end 320 of the adjusting element 300, and the rolling element 400 arranged at the second end 320 of the adjusting element 300 is rotatably connected to the second mounting member 500. Further, a first accommodation cavity 510 is provided in the second mounting member 500. A part of the rolling element 400 arranged at the second end 320 of the adjusting element 300 is accommodated in the first accommodation cavity 510, and the other part is exposed outside the first accommodation cavity 510. The "second mounting member 500" refers to the component that is arranged at the second end 320 of the mounting member, is connected to and can be connected to the rolling element 400 arranged at the second end 320 of the adjusting element 300, and can accommodate a part of the rolling element 400. Optionally, the second mounting member 500 can be a structure such as a bracket, and no specific limitation is made here. The "first accommodation cavity 510" refers to the cavity in the second mounting member 500 that can accommodate a part of the rolling element 400 arranged at the second end 320 of the adjusting element 300. The arrangement of the second mounting member 500 makes the overall structure more flexible and facilitates the rolling element 400 to drive the adjusting element 300 to rotate. Moreover, the first accommodation cavity 510 can ensure the firm connection of the rolling element 400 and make the second mounting member 500 not contact the circumferential weld 20 as much as possible, avoiding the second mounting member 500 from affecting the circumferential rotation of the rolling element 400 to guide the base 100 around the circumferential weld 20.

[0064] In some embodiments of the present application, please refer to Figure 3, the first end 310 of the adjusting member 300 is threadedly connected to the base 100 so as to be able to adjust the position of the adjusting member 300 along the extending direction of the adjusting member 300, wherein the extending direction of the adjusting member 300 is the direction from the first end 310 to the second end 320 of the adjusting member 300. It can be understood that adjusting the first end 310 of the adjusting member 300 can appropriately adjust the adjusting member 300 under different working conditions to adapt to the actual working conditions. Moreover, since the rolling member 400 is directly installed on the weld, the length of the adjusting member 300 is only related to the size of the valve port diameter in the actual working condition, and there is no special requirement for the valve shape.

[0065] In some embodiments of the present application, please continue to refer to Figure 1 , the cutting device further includes an operating member 600, and the operating member 600 is disposed on the base 100 to provide a fulcrum for acting. Further, the operating member 600 is detachably connected to the base 100. Still further, there are two operating members 600, and the two operating members 600 are symmetrically arranged with respect to the center line a. The "operating member 600" refers to a component connected to the base 100 that allows a staff member to perform operations. Optionally, the operating member 600 can be a handle, and no specific limitation is made here. The setting of the operating member 600 facilitates the staff to operate the cutting device. The detachable structure enables the worker to replace the operating member 600 according to the actual working conditions. Optionally, using a longer operating member 600 can save effort, but if encountering a position with a relatively narrow installation location, a shorter operating member 600 can be replaced to avoid obstacles. The symmetrical arrangement of the operating members 600 with respect to the center line a facilitates the staff to control the cutting device and enables the rolling member 400 to better guide the circumferential rotation of the base 100 around the annular weld 20.

[0066] In some embodiments of the present application, the base 100 includes a body portion 120 and extension portions 130 provided at opposite ends of the body. The body portion 120 has a first sub-portion 121 and second sub-portions 122 provided at both ends of the first sub-portion 121. The first sub-portion 121 and the two second sub-portions 122 enclose a groove body for accommodating a part of the annular weld 20. The rolling member 400 provided on the base 100 is rotatably provided on the second sub-portion 122. One of the two extension portions 130 is connected to one of the two second sub-portions 122, and the other of the two extension portions 130 is connected to the other of the two second sub-portions 122. The first end 310 of one of the two adjusting members 300 is detachably connected to one of the two extension portions 130, and the first end 310 of the other of the two adjusting members 300 is detachably connected to the other of the two extension portions 130. Further, a second accommodation cavity 1221 is provided in the second sub-portion 122, and a part of the rolling member 400 provided on the base 100 is accommodated in the second accommodation cavity 1221, and the other part is exposed outside the second accommodation cavity 1221.

[0067] The "main body part 120" refers to the part at the center of the base 100, and the "extension part 130" refers to the part of the base 100 that is connected to both ends of the main body part 120 and excludes the main body part 120. The "first sub - part 121" refers to the part at the center of the main body part 120, and the "second sub - part 122" refers to the component of the main body part 120 that is connected to the first sub - part 121 at one end and to the extension part 130 at the other end and excludes the first sub - part 121. The "second accommodation cavity 1221" refers to the cavity in the second sub - part 122 that can accommodate a part of the rolling element 400 provided on the base 100. The structural setting of the base 100 enables the rolling element 400 provided on the base 100 to keep the base 100 at a certain distance from the circumferential weld 20, preventing the base 100 from affecting the guiding of the rolling element 400 for the circumferential rotation of the base 100 around the circumferential weld 20.

[0068] During use, please refer to 2. According to the valve size and weld width, select appropriate rolling elements 400, base 100, adjusting parts 300, etc. After assembly, fit the rolling element 400 to the circumferential weld 20 so that the first mounting part 110 is fixed on the circumferential weld 20. Next, select a suitable cutting part 200, bring the cutting part 200 close to a suitable position of the weld, ensuring that the distance to the side of the valve body is as close as possible, so as to remove the weld as much as possible for subsequent cleaning. The cutting part 200 feeds in a direction parallel to the axis b for preliminary cutting to form a cutting track. Since the cutting part 200 feeds in a direction parallel to the axis b, there is no situation of incorrect cutting alignment or excessive cutting depth that may cause incorrect cutting of the valve. When the cutting track reaches a certain depth, switch to a more suitable cutting part 200 for cutting, gradually feeding in to make the cutting depth reach one - half to two - thirds of the weld width, ensuring that the cutting surface exceeds the center of the weld. Subsequently, utilize the structural weakness at the weld and use a tool to tap in a way that makes the weld break naturally, thus separating the valve body and the valve core to complete the cutting. When forming the cutting track during preliminary cutting, optionally, the cutting part 200 can be a fine cutting tool, and there is no excessive limitation here. When the cutting track reaches a certain depth, the cutting part 200 to be used, optionally, can be a star - shaped grooving tool, and there is no excessive limitation here. Finally, when using a tool to tap, optionally, the tool can be a hook - shaped wrench, and there is no excessive limitation here.

[0069] In summary, in the embodiment of the present application, by directly installing the rolling member 400 on the weld seam and adjusting the dimensions of components such as the adjusting member 300 and the rolling member 400, it is possible to adapt to valves of different calibers without special requirements for the valve shape. Moreover, the first mounting member 110 is fixed on the annular weld seam 20 by the rolling member 400, so that the base 100 can be guided to rotate circumferentially around the annular weld seam 20. Furthermore, the cutting member 200 cuts the annular weld seam 20 driven by the base 100, enabling the cutting process to be controlled, the cutting track to be stable, and the reliability to be high. It can avoid the situation of too deep or too shallow cutting depth, thereby improving the cutting quality, preventing accidental damage to the valve and resulting in valve scrapping, reducing the valve scrapping rate, and improving the cutting efficiency. At the same time, since the overall device structure in the embodiment of the present application is simple, compact, has a small working space, is convenient for operation and maintenance, and can be applied to difficult and complex on-site operations, it improves the labor efficiency and shortens the processing period for valve modification. Further, in the embodiment of the present application, the cutting member 200 can be replaced, thus optimizing the cutting process and making the cutting quality controllable. The overall cutting device achieves the effect of rapid cutting, meets the requirements for valve welding repair after cutting, and meets the accuracy requirements for the width of the cutting edge.

[0070] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0071] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A cutting device for cutting annular weld seams, characterized in that, The cutting device includes: a base and a cutting member. The base has a center line perpendicular to the plane where the circumferential weld is located, and the cutting member is disposed on the base; two adjusting members. Each adjusting member has a first end and a second end oppositely arranged along the longitudinal direction. Each first end is detachably connected to the base; the two adjusting members are symmetrically arranged with respect to the center line, and the two first ends face each other and are not connected to each other, and the two second ends extend obliquely away from each other; and a plurality of rolling members. A part of the rolling members among all the rolling members is rotatably disposed on the base, and another part of the rolling members is rotatably disposed on the second end of the adjusting member; wherein, a receiving groove is provided in the circumferential direction of all the rolling members. The receiving groove is used to receive a part of the circumferential weld along the circumferential direction of the circumferential weld, so as to be able to guide the base to rotate around the circumferential direction of the circumferential weld, so that the cutting member cuts the circumferential weld under the drive of the base; the circumferential weld has an axis; the feed direction of the cutting member is parallel to the axis; the base includes a body portion and extension portions provided at opposite ends of the body. The extension portions and the body portion are both flatly arranged; the body portion has a first sub-portion and second sub-portions provided at both ends of the first sub-portion; the first sub-portion and the two second sub-portions enclose a groove body for receiving a part of the circumferential weld, and the rolling members disposed on the base are rotatably disposed on the second sub-portion; the first end of the adjusting member is threadedly connected to the base to be able to adjust the position of the adjusting member along the extending direction of the adjusting member; the extending direction of the adjusting member is the direction from the first end of the adjusting member to the second end of the adjusting member.

2. The cutting device according to claim 1, characterized in that, The cutting member is detachably disposed on the base.

3. The cutting device according to claim 2, wherein, The cutting device further includes a first mounting member detachably connected to the base; the cutting member is detachably connected to the first mounting member.

4. The cutting device according to claim 3, wherein An installation groove is provided on the first mounting member; the installation groove is used to receive a part of the cutting member.

5. The cutting device according to any one of claims 1-4, characterized in that, All the rolling members are symmetrically arranged with respect to the center line.

6. The cutting device according to claim 5, characterized in that, Four rolling members are provided; two of the rolling members are rotatably disposed on the base, and one of the other two rolling members is rotatably disposed on the second end of one of the two adjusting members, and the other of the other two rolling members is rotatably disposed on the second end of the other of the two adjusting members.

7. The cutting device according to any one of claims 1-4, characterized in that The cutting device further includes a second mounting member; the second mounting member is disposed on the second end of the adjusting member, and the rolling member disposed on the second end of the adjusting member is rotatably connected to the second mounting member.

8. The cutting device according to claim 7, characterized in that A first accommodation cavity is provided in the second mounting member; a part of the rolling member disposed on the second end of the adjusting member is accommodated in the first accommodation cavity, and the other part is exposed outside the first accommodation cavity.

9. The cutting device according to any one of claims 1-4, characterized in that The cutting device further includes an operating member; the operating member is disposed on the base to provide a acting fulcrum.

10. The cutting device according to claim 9, characterized in that, The operating member is detachably connected to the base.

11. The cutting device according to claim 9, wherein, Two operating members are provided; the two operating members are symmetrically arranged with respect to the center line.

12. The cutting device according to any one of claims 1-4, characterized in that One of the two extension parts is connected to one of the two second sub-parts, and the other of the two extension parts is connected to the other of the two second sub-parts; the first end of one of the two adjusting parts is detachably connected to one of the two extension parts, and the first end of the other of the two adjusting parts is detachably connected to the other of the two extension parts.

13. The cutting device according to claim 1, characterized in that, A second accommodation cavity is provided in the second sub-part; A part of the rolling member provided on the base is accommodated in the second accommodation cavity, and the other part is exposed outside the second accommodation cavity.

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