Taking-out device

Abstract

The invention belongs to the technical field of valve maintenance, and particularly relates to a taking-out device which is suitable for taking out packing of a valve and comprises a fixing frame, a hooking piece, a rotating sleeve and a moving sleeve. The fixing frame is used for being fixed to a valve. The hooking piece is provided with a main body part and a hooking part, the hooking part is connected with one end of the main body part, and the hooking part is used for hooking the packing; the rotating sleeve is used for sleeving a valve rod of the valve, one end of the rotating sleeve is fixedly connected with the other end of the main body part, and the rotating sleeve is used for driving the hooking part to rotate; the moving sleeve is sleeved outside the rotating sleeve, is movably connected with the fixed frame and is used for pushing the rotating sleeve to move back and forth along the axis of the moving sleeve; according to the taking-out device, the packing can be directly taken out from the packing box, a valve does not need to be disassembled, the packing is taken out easily, and the taking-out difficulty of the packing can be reduced easily.

Description

Technical Field

[0001] This application belongs to the technical field of valve maintenance, and particularly relates to a removal device. Background Art

[0002] As an important part of clean energy, nuclear power occupies a key position in the global energy structure. The safety and stability of nuclear power plant operation are of crucial importance. Any minor fault may lead to serious consequences, threatening environmental safety and public health. In the complex system of a nuclear power plant, nuclear-grade valves are the core components to ensure the correct transmission and control of fluid media, and their sealing performance directly determines the reliable operation of the entire nuclear power system.

[0003] As a key component for the nuclear-grade valve to achieve the sealing function, the packing works in an extremely harsh environment. It is under the long-term action of high temperature, high pressure and strong radiation, and in the case of multiple switch operations of the valve electric head, the packing is extremely prone to wear, aging and corrosion, which in turn leads to a decrease in sealing performance and causes the medium to leak from the packing. Therefore, it is necessary to regularly replace or repair the packing; however, in the actual process of packing replacement, the nuclear-grade valve needs to be disassembled before the packing can be removed. In this way, during the operation process, maintenance personnel need to strictly follow the radiation protection procedures of the nuclear power plant, wear heavy protective equipment, and the working environment is limited, making the operation difficult.

[0004] The above statements are only used to provide background technical information related to this application, and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a removal device that can reduce the difficulty of removing the packing from the valve.

[0006] To achieve the above purpose, a technical solution adopted in the embodiments of this application is: a removal device suitable for removing the packing of a valve. The removal device includes a fixing frame, a hooking member, a rotating sleeve and a moving sleeve; the fixing frame is used to be fixed to the valve; the hooking member has a main body portion and a hooking portion, the hooking portion is connected to one end of the main body portion, and the hooking portion is used to hook the packing; the rotating sleeve is used to be sleeved outside the valve stem, one end of the rotating sleeve is fixedly connected to the other end of the main body portion, and the rotating sleeve is used to drive the hooking portion to rotate around the axis of the rotating sleeve; the moving sleeve is sleeved outside the rotating sleeve, the moving sleeve is movably connected to the fixing frame, and the moving sleeve is used to push the rotating sleeve to move back and forth along its own axis.

[0007] Optionally, the fixing frame is provided with a rotating screw hole, and the moving sleeve is screwed into the rotating screw hole.

[0008] Optionally, the hook - setting portion extends obliquely along the circumferential direction of the rotating sleeve; the rotating hook - setting direction of the rotating sleeve is the same as the oblique extending direction of the hook - setting portion. When the moving sleeve pushes the rotating sleeve to move towards the hooking member, the rotating direction of the moving sleeve is opposite to the rotating hook - setting direction of the rotating sleeve.

[0009] Optionally, the pitch range of the moving sleeve is 2 mm to 6 mm.

[0010] Optionally, the taking - out device further includes a nut. The nut is sleeved outside the rotating sleeve and is screwed to the rotating sleeve. The nut is located at the end of the moving sleeve facing away from the hooking member and is used to abut against the moving sleeve.

[0011] Optionally, a first rolling bearing plate is provided between the nut and the moving sleeve.

[0012] Optionally, the outer peripheral surface of the rotating sleeve has a stepped surface, and the stepped surface is used to abut against the end of the moving sleeve close to the hooking member.

[0013] Optionally, a second rolling bearing plate is provided between the stepped surface and the end surface of the moving sleeve.

[0014] Optionally, the taking - out device further includes a first guide sleeve. The first guide sleeve is sleeved outside the valve stem of the valve and is located inside the rotating sleeve, and / or the taking - out device further includes a second guide sleeve. The main body portion is sleeved outside the valve stem of the valve, and the second guide sleeve is sleeved outside the valve stem of the valve and is located inside the main body portion.

[0015] Optionally, the fixing frame includes a fixing sleeve and a plurality of connecting portions. The fixing sleeve is sleeved outside the moving sleeve, and the plurality of connecting portions are connected to the fixing sleeve and are distributed at intervals along the circumferential direction of the fixing sleeve. The connecting portions are provided with long holes extending along the radial direction of the fixing sleeve, and the long holes are connected to the yoke of the valve through fasteners.

[0016] One or more of the above technical solutions provided by the present application for the extraction device have at least one of the following technical effects: When the extraction device of the embodiment of the present application is used, first fix the fixing frame on the valve, and sleevethe rotating sleeve and the moving sleeve outside the valve stem of the valve. Move the moving sleeve along the axial direction of the valve stem. The moving sleeve pushes the rotating sleeve to move. The rotating sleeve pushes the main body part and the hooking part of the hooking member to extend into the stuffing box until the hooking part is inserted into the packing. Then rotate the rotating sleeve so that the hooking part rotates, thereby hooking in the packing. After the hooking part is hooked, move the moving sleeve in the reverse direction, thereby pulling out the packing from the stuffing box, and thus the extraction of the packing is completed. The extraction device of the embodiment of the present application can directly extract the packing from the stuffing box without disassembling the valve, enabling the extraction of the packing during the operation of the valve without the need to stop the equipment, ensuring the continuity of nuclear power operation, greatly improving the maintenance efficiency, avoiding huge economic losses caused by shutdown, and at the same time reducing the safety risks brought by complex shutdown operations, effectively ensuring personnel safety. When the extraction device of the embodiment of the present application is used, the extraction of the packing can be achieved by moving the moving sleeve and rotating the rotating sleeve. The operation of extracting the packing is simple, which is beneficial to reducing the difficulty of extracting the packing. The insertion operation of the hooking part and the hooking rotation operation are respectively realized by two components, namely the moving sleeve and the rotating sleeve. These two operations are relatively independent, which is beneficial to improving the reliability of packing extraction.

[0017] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0019] Figure 1 Structural schematic of the extraction device and the valve provided for some embodiments of the present application Figure 1 .

[0020] Figure 2 is Figure 1 the structural schematic of the extraction device and the valve shown Figure 2 .

[0021] Figure 3 is the sectional view along the Figure 2 A-A line in

[0022] Figure 4 isFigure 1 Exploded schematic view of the taking-out device in

[0023] Figure 5 is Figure 4 Structural schematic view of the hooking member in

[0024] Figure 6 is Figure 4 Structural schematic view of the fixing bracket in

[0025] Among them, each reference numeral in the figure:

[0026] 100, taking-out device; 110, fixing bracket; 111, fixing sleeve; 1111, rotating screw hole; 112, connecting portion; 1121, long slot; 120, hooking member; 121, main body portion; 122, hooking portion; 130, rotating sleeve; 131, stepped surface; 132, rotating handle; 140, moving sleeve; 141, force-applying handle; 150, nut; 161, first rolling bearing piece; 162, second rolling bearing piece; 171, first guide sleeve; 172, second guide sleeve; 200, valve; 201, stuffing box; 210, packing; 220, valve stem; 230, lantern ring; 240, yoke. Specific embodiments

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0028] In the description of the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot 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 of such features.

[0029] In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In this application, unless otherwise clearly stipulated or defined, the terms "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In this application, unless otherwise clearly stipulated or defined, 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 indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level 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 is at a lower horizontal level than the second feature.

[0032] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "inside", "outside", "side", "top", "bottom", "front", "rear", etc. is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0033] In the description of this application, it should be noted that the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0034] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same components or the same parts. For the same parts in the embodiments of this application, only one of the parts or components may be marked with the reference numeral in the figure. It should be understood that for other identical parts or components, the reference numerals are equally applicable.

[0035] As an important part of clean energy, nuclear power occupies a key position in the global energy structure. The safety and stability of nuclear power plant operation are of crucial importance. Any minor fault may lead to serious consequences and threaten environmental safety and public health. In the complex systems of nuclear power plants, nuclear-grade valves are the core components to ensure the correct transmission and control of fluid media, and their sealing performance directly determines the reliable operation of the entire nuclear power system. Nuclear-grade valves are mainly used to control the flow of fluid media such as coolant and steam to ensure the safe and stable operation of nuclear power plants.

[0036] Packing, a key component in achieving the sealing function of nuclear-grade valves, is installed within the valve's packing box and fills the gap between the valve stem and the inner wall of the packing box, providing a seal. Packing is typically made of graphite. Packing operates in an extremely harsh environment, enduring high temperatures, high pressures, and strong radiation. Furthermore, with the valve's electric actuator repeatedly operating, the packing is susceptible to wear, aging, and corrosion, which can degrade the seal and cause fluid leakage. These leaks are a frequent problem in nuclear power operations and a major challenge for the industry.

[0037] Once a packing leak occurs, if it is not promptly handled, it will not only cause the loss of fluid media and reduce system operating efficiency, but may also cause more serious safety accidents and pose a direct threat to the safe operation of the nuclear power plant. Therefore, the packing needs to be inspected and replaced regularly.

[0038] However, replacing the packing requires disassembly and removal of the valve. During nuclear power plant overhauls, multiple valves must be opened and closed to drain water and empty the pipes. Valve disassembly increases maintenance time and the radiation dose to personnel. Furthermore, full disassembly involves isolation and drainage, which increases the maintenance period. This process is not only time-consuming and labor-intensive, but also significantly increases the maintenance period and the radiation dose to maintenance personnel. Without full disassembly, the valve stem does not need to be removed. However, due to the small gap between the valve stem and the packing box, the packing is tightly compressed, making removal extremely difficult.

[0039] Based on this, an embodiment of the present application provides a removal device that can easily and quickly remove the packing of the valve without disassembling the valve.

[0040] The following combination Figures 1 to 6 The removal device 100 according to the embodiment of the present application is described.

[0041] In some embodiments, see Figures 1 to 5 As shown, the removal device 100 is suitable for removing the packing 210 of the valve 200. The removal device 100 includes a fixed frame 110, a hooking member 120, a rotating sleeve 130 and a movable sleeve 140; the fixed frame 110 is used to be fixed to the valve 200; the hooking member 120 has a main body 121 and a hooking portion 122, the hooking portion 122 is connected to one end of the main body 121, and the hooking portion 122 is used to hook with the packing 210; the rotating sleeve 130 is used to be sleeved on the outside of the valve stem 220 of the valve 200, one end of the rotating sleeve 130 is fixedly connected to the other end of the main body 121, and the rotating sleeve 130 is used to drive the hooking portion 122 to rotate around the axis of the rotating sleeve 130; the movable sleeve 140 is sleeved outside the rotating sleeve 130, the movable sleeve 140 is movably connected to the fixed frame 110, and the movable sleeve 140 is used to push the rotating sleeve 130 to move back and forth along its own axis.

[0042] The fixing bracket 110 may refer to a component fixed to the valve 200 and used to support the rotating sleeve 130 and the moving sleeve 140. The fixing bracket 110 can adopt a frame structure, or other structures. The fixing bracket 110 and the valve 200 can be connected by fasteners such as bolts and screws.

[0043] The hooking member 120 may refer to a component used to hook the packing 210. The hooking member 120 includes a main body portion 121 and a hooking portion 122. The main body portion 121 may refer to the main structure of the hooking member 120, which plays a role in supporting the hooking portion 122. The main body portion 121 and the hooking portion 122 can be an integrated structure, or can be separately formed and then assembled together. The two ends of the main body portion 121 are respectively connected to the hooking portion 122 and the rotating sleeve 130. The main body portion 121 and the rotating sleeve 130 can be connected by fasteners such as bolts and screws.

[0044] In some examples, the hooking portion 122 can be an arc-shaped structure. During the process of the rotating sleeve 130 driving the hooking member 120 to rotate, the hooking portion 122 can be hooked inside the packing 210.

[0045] The rotating sleeve 130 may refer to a component used to drive the hooking portion 122 to rotate.

[0046] Exemplarily, the rotating sleeve 130 is a circular sleeve with a hollow interior. The rotating sleeve 130 is sleeved outside the valve stem 220. One end of the rotating sleeve 130 is connected to the main body portion 121. The main body portion 121 is a circular sleeve with a hollow interior. The main body portion 121 is sleeved outside the valve stem 220. The rotating sleeve 130 and the main body portion 121 are coaxially arranged. The rotating sleeve 130 and the main body portion 121 are both in clearance fit with the valve 200. The rotating sleeve 130 rotates relative to the valve stem 220, thereby driving the main body portion 121 to rotate, and further driving the hooking portion 122 to rotate, so that the hooking portion 122 can be hooked inside the packing 210. The number of the hooking portions 122 is multiple. The multiple hooking portions 122 are circumferentially spaced apart along the main body portion 121. The arrangement of the multiple hooking portions 122 enables the packing 210 and the hooking member 120 to form multiple hooking points, which is beneficial to improving the stability and reliability of the removal of the packing 210.

[0047] The moving sleeve 140 may refer to a component that pushes the rotating sleeve 130 to move. The moving sleeve 140 is sleeved outside the rotating sleeve 130. The moving sleeve 140 is movably connected to the fixing bracket 110. The moving sleeve 140 can move relative to the fixing bracket 110 along its own axial direction, that is, along the axial direction of the valve stem 220. In this way, when the moving sleeve 140 moves towards the packing 210, the moving sleeve 140 pushes the rotating sleeve 130 to move, and further pushes the hooking member 120 to move towards the packing 210. The hooking portion 122 of the hooking member 120 is inserted into the packing 210 to facilitate the subsequent hooking of the hooking portion 122.

[0048] When the extraction device 100 according to the embodiment of the present application is in use, first fix the fixing frame 110 on the valve 200, and sleeved the rotating sleeve 130 and the moving sleeve 140 outside the valve stem 220 of the valve 200. Move the moving sleeve 140 along the axial direction of the valve stem 220. The moving sleeve 140 pushes the rotating sleeve 130 to move. The rotating sleeve 130 pushes the main body portion 121 and the hooking portion 122 of the hooking member 120 to extend into the stuffing box 201 until the hooking portion 122 is inserted into the packing 210. Then rotate the rotating sleeve 130 so that the hooking portion 122 rotates, thereby hooking in the packing 210. After the hooking portion 122 is hooked, move the moving sleeve 140 in the reverse direction, thereby pulling out the packing 210 from the stuffing box 201. In this way, the extraction of the packing 210 is completed. The extraction device 100 according to the embodiment of the present application can directly extract the packing 210 from the stuffing box 201 without disassembling the valve 200, so that the packing 210 can be extracted during the operation of the valve 200. The equipment does not need to stop, ensuring the continuity of nuclear power operation, greatly improving the maintenance efficiency, avoiding huge economic losses caused by shutdown, and at the same time reducing the safety risks brought by complex shutdown operations, effectively ensuring personnel safety. When the extraction device 100 according to the embodiment of the present application is in use, the extraction of the packing 210 can be realized by the movement of the moving sleeve 140 and the rotation of the rotating sleeve 130. The extraction operation of the packing 210 is simple, which is beneficial to reducing the difficulty of extracting the packing 210. The insertion operation and the hooking rotation operation of the hooking portion 122 are realized by two components, the moving sleeve 140 and the rotating sleeve 130 respectively. These two operations are relatively independent. The depth of the hooking portion 122 inserted into the packing 210 can be accurately controlled by the moving sleeve 140, improving the reliability of extracting the packing 210.

[0049] In some embodiments, refer to Figure 3 As shown, the rotating sleeve 130 is provided with two rotating handles 132. One ends of the two rotating handles 132 are respectively installed on the opposite sides of the rotating sleeve 130. The two rotating handles 132 are perpendicular to the axial direction of the rotating sleeve 130. Personnel hold the two rotating handles 132 to rotate the rotating sleeve 130, and the rotation operation of the rotating sleeve 130 is more time-saving and labor-saving.

[0050] In some embodiments, refer to Figure 4 As shown, the fixing frame 110 is provided with a rotating screw hole 1111, and the moving sleeve 140 is screwed into the rotating screw hole 1111.

[0051] The fixing bracket 110 is provided with a through hole, and the inner wall surface of the through hole is provided with internal threads, and the through hole forms a rotating screw hole 1111. The outer wall surface of the moving sleeve 140 is provided with external threads. Through the mutual engagement of the internal and external threads, the screwing connection between the fixing bracket 110 and the moving sleeve 140 is realized; under the engagement action of the internal and external threads, the moving sleeve 140 rotates, and the moving sleeve 140 can move along its own axial direction relative to the fixing bracket 110, so as to insert the hooking part 122 into the packing 210 or take out the packing 210 from the stuffing box 201.

[0052] By adopting the technical solution of this embodiment, the moving sleeve 140 and the fixing bracket 110 are connected by screw thread fit, and the connection structure is simple, and the movement of the moving sleeve 140 is also simpler; in addition, the screw thread fit can be utilized to control the depth of the hooking part 122 inserted into the packing 210, so as to facilitate the removal of the packing 210.

[0053] In some embodiments, the moving sleeve 140 is provided with two force-applying handles 141. One ends of the two force-applying handles 141 are respectively installed on opposite sides of the moving sleeve 140, and the two force-applying handles 141 are arranged perpendicular to the axial direction of the moving sleeve 140. Personnel hold the two force-applying handles 141 to rotate the moving sleeve 140, and the rotation operation of the moving sleeve 140 is more time-saving and labor-saving.

[0054] In some embodiments, please also refer to Figure 5 As shown, the hooking part 122 extends obliquely along the circumferential direction of the rotating sleeve 130; the rotating hooking direction of the rotating sleeve 130 is the same as the oblique extension direction of the hooking part 122. When the moving sleeve 140 pushes the rotating sleeve 130 to move towards the hooking member 120, the rotating direction of the moving sleeve 140 is opposite to the rotating hooking direction of the rotating sleeve 130.

[0055] The hooking part 122 may refer to an inclined structure that extends obliquely along the circumferential direction of the main body part 121. One end of the inclined structure is connected to the main body part 121, and the other end of the inclined structure is the free end of the hooking part 122; the rotating hooking direction of the rotating sleeve 130 is the oblique extension direction of the hooking part 122; during the process of the rotating sleeve 130 driving the hooking part 122 to rotate along its oblique direction, the free end of the hooking part 122 can be hooked into the packing 210, so as to realize the hooking and fixing between the hooking member 120 and the packing 210.

[0056] When the moving sleeve 140 pushes the rotating sleeve 130 to move towards the hooking member 120, the rotating direction of the moving sleeve 140 is opposite to the rotating hooking direction of the rotating sleeve 130, and the rotating direction of the moving sleeve 140 is opposite to the oblique extension direction of the hooking part 122, so that during the process of the moving sleeve 140 pushing the packing 210 out of the stuffing box 201, the rotating direction of the moving sleeve 140 is the same as the oblique extension direction of the hooking part 122.

[0057] By adopting the technical solution of this embodiment, when the moving sleeve 140 pushes the packing 210 out of the packing gland 201, the rotation direction of the moving sleeve 140 is the same as the inclined extension direction of the hooking part 122. The rotation of the moving sleeve 140 and the force transmitted by the moving sleeve 140 to the rotating sleeve 130 are conducive to driving the hooking part 122 to rotate along its inclined extension direction, so that the hooking part 122 can be stably hooked into the packing 210, improving the stability of the hooking part 122 being hooked into the packing 210 and reducing the risk of the hooking part 122 failing to hook during the process of the packing 210 being withdrawn from the packing gland 201.

[0058] In some embodiments, the pitch range of the moving sleeve 140 is 2 mm to 6 mm.

[0059] The pitch of the moving sleeve 140 can be 2 mm, 6 mm, or any value between 2 mm and 6 mm; for example, the pitch of the moving sleeve 140 can be 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm.

[0060] By adopting the technical solution of this embodiment, with the pitch of the moving sleeve 140 set within the above range, on the one hand, when the moving sleeve 140 rotates one circle, the moving sleeve 140 has an appropriate moving distance, enabling the hooking part 122 to be inserted into the packing 210 relatively quickly or pulling the packing 210 out of the packing gland 201. At the same time, the moving sleeve 140 can also apply an appropriate force to the hooking part 122 to insert it into the packing 210, facilitating the hooking of the hooking part 122.

[0061] In some embodiments, referring to Figure 3 and Figure 4 as shown, the removing device 100 further includes a nut 150. The nut 150 is sleeved outside the rotating sleeve 130 and is screwed to the rotating sleeve 130. The nut 150 is located at the end of the moving sleeve 140 facing away from the hooking member 120 and is used to abut against the moving sleeve 140.

[0062] The nut 150 is used to be screwed outside the moving sleeve 140, and the internal thread of the nut 150 meshes with the external thread of the moving sleeve 140.

[0063] By adopting the technical solution of this embodiment, after the rotating sleeve 130 rotates to drive the hooking part 122 to hook into the packing 210, during the process of the moving sleeve 140 moving away from the packing gland 201, the moving sleeve 140 abuts against the nut 150, so that the movement of the moving sleeve 140 can drive the rotating sleeve 130 and the hooking member 120 away from the packing gland 201, thereby pulling the packing 210 out of the packing gland 201 and realizing the removal of the packing 210.

[0064] In some embodiments, referring to Figure 3 and Figure 4 as shown, a first rolling bearing plate 161 is provided between the nut 150 and the moving sleeve 140.

[0065] The first rolling bearing piece 161 may refer to a rolling bearing piece provided between the nut 150 and the moving sleeve 140.

[0066] In some examples, the rolling bearing piece is made of high-precision bearing steel and its surface is hardened, having high hardness and good wear resistance. The balls of the rolling bearing piece are arranged closely and evenly, which can effectively reduce the rotational friction between the nut 150 and the moving sleeve 140.

[0067] By adopting the technical solution of this embodiment, the first rolling bearing piece 161 is provided between the nut 150 and the moving sleeve 140. The first rolling bearing piece 161 can effectively reduce the rotational friction between the nut 150 and the moving sleeve 140, making the rotation of the moving sleeve 140 smoother, the operation more labor-saving, and improving the working efficiency of the entire removing device 100.

[0068] In some embodiments, referring to Figure 3 and Figure 4 as shown, the outer peripheral surface of the rotating sleeve 130 has a stepped surface 131, and the stepped surface 131 is used to abut against the end of the moving sleeve 140 close to the hooking member 120.

[0069] The rotating sleeve 130 is a stepped shaft sleeve, and the planes formed at different diameter positions of the stepped shaft sleeve are the stepped surfaces 131.

[0070] Exemplarily, one end of the rotating sleeve 130 has a large diameter and the other end has a small diameter. The moving sleeve 140 is sleeved on the small-diameter end of the rotating sleeve 130 and abuts against the stepped surface 131.

[0071] By adopting the technical solution of this embodiment, the moving sleeve 140 abuts against the stepped surface 131. When the moving sleeve 140 moves towards the packing 210, the moving sleeve 140 drives the rotating sleeve 130 towards the packing 210, thereby driving the hooking portion 122 to insert into the packing 210 to achieve the insertion of the hooking portion 122 and the packing 210. The connection mode of the moving sleeve 140 and the rotating sleeve 130 by abutting is simple, and the processing and manufacturing are simple.

[0072] In some embodiments, a second rolling bearing piece 162 is provided between the stepped surface 131 and the end face of the moving sleeve 140.

[0073] The second rolling bearing piece 162 may refer to a rolling bearing piece provided between the stepped surface 131 and the moving sleeve 140.

[0074] By adopting the technical solution of this embodiment, a second rolling bearing piece 162 is arranged between the step surface 131 and the moving sleeve 140. The second rolling bearing piece 162 can effectively reduce the rotational friction force between the step surface 131 and the moving sleeve 140, make the rotation of the moving sleeve 140 smoother, the operation more labor-saving, and improve the working efficiency of the entire removing device 100.

[0075] In some cases, due to the small space of the stuffing box 201 of the valve 200, the valve stem 220 or the stuffing box 201 may be damaged during the process of removing the packing 210, causing secondary damage to the valve 200 and reducing the service life of the valve 200.

[0076] In some embodiments, the removing device 100 further includes a first guide sleeve 171 sleeved outside the valve stem 220 of the valve 200 and located inside the rotating sleeve 130, and / or the removing device 100 further includes a second guide sleeve 172, the main body portion 121 is sleeved outside the valve stem 220 of the valve 200, and the second guide sleeve 172 is sleeved outside the valve stem 220 of the valve 200 and located inside the main body portion 121.

[0077] The first guide sleeve 171 is sleeved outside the valve stem 220, and the rotating sleeve 130 is sleeved outside the first guide sleeve 171. The first guide sleeve 171 and the valve stem 220 can be in clearance fit or in close fit; the rotating sleeve 130 and the first guide sleeve 171 can be in clearance fit or in close fit; the first guide sleeve 171 can separate the rotating sleeve 130 and the valve stem 220, reducing the risk of damage to the valve stem 220; in addition, the first guide sleeve 171 can also play a guiding role for the rotating sleeve 130, thereby guiding the hooking member 120 to move along a preset path, reducing the risk of the hooking member 120 contacting the inner wall of the stuffing box 201, reducing the risk of damage to the valve 200, and improving the service life of the valve 200.

[0078] The second guide sleeve 172 is sleeved outside the valve stem 220, and the main body portion 121 is sleeved outside the second guide sleeve 172. The second guide sleeve 172 and the valve stem 220 can be in clearance fit or in close fit; the main body portion 121 and the second guide sleeve 172 are in clearance fit or in close fit; the second guide sleeve 172 can separate the main body portion 121 and the valve stem 220, reducing the risk of damage to the valve stem 220; in addition, the second guide sleeve 172 can also play a guiding role for the main body portion 121, thereby guiding the hooking member 120 to move along a preset path, reducing the risk of the hooking member 120 contacting the inner wall of the stuffing box 201, reducing the risk of damage to the valve 200, and improving the service life of the valve 200.

[0079] During use, the first guide sleeve 171 and the second guide sleeve 172 of different sizes can also be replaced according to the valves 200 of different sizes to meet the requirement of removing the packing 210 of the valves 200 of different sizes.

[0080] In some examples, the first guide sleeve 171 and the second guide sleeve 172 are made of polytetrafluoroethylene material, which has an extremely low coefficient of friction, good chemical stability and corrosion resistance. The first guide sleeve 171 and the second guide sleeve 172 are respectively installed in the stepped holes of the rotating sleeve 130 and the main body part 121. The first guide sleeve 171 and the second guide sleeve 172 can tightly wrap the valve stem 220. During the removal process of the packing 210, they can not only play a guiding role, but also effectively isolate the rotating sleeve 130 from the valve stem 220 and the main body part 121 from the valve stem 220, reducing any scratches or abrasions on the valve stem 220 and the packing gland 201, which is beneficial to extending the service life of the valve 200.

[0081] In some embodiments, the hooking member 120 is made of high-strength alloy material, which has excellent wear resistance and corrosion resistance and can work stably in a harsh nuclear power environment. The hooking part 122 at the lower part of the hooking member 120 is a toothed structure. The hooking part 122 is processed by a special process, with sharp and evenly distributed teeth. Under the action of the rotational force transmitted by the rotating sleeve 130, it can efficiently break the packing 210 and improve the removal efficiency. Four accurately positioned connecting holes are designed on the upper frustum of the main body part 121. When connected to the rotating sleeve 130, it can ensure the concentricity of the main body part 121 and the rotating sleeve 130, so that the rotational force is evenly transmitted. The dimensional accuracy of the stepped hole inside the frustum is extremely high and can be perfectly adapted to the second guide sleeve 172. The second guide sleeve 172 can closely fit the valve stem 220 to protect the valve stem 220 from damage in all directions.

[0082] In some embodiments, the rotating sleeve 130 is made of high-purity copper material and is matched with the moving sleeve 140 through the second rolling bearing piece 162 above the stepped surface 131 to reduce the frictional loss with the moving sleeve 140 and extend the service life. The inside of the rotating sleeve 130 is a stepped hole. The diameter of the hole section with a smaller step is one millimeter larger than the diameter of the valve stem 220, which not only ensures that the valve stem 220 can freely pass through, but also maintains a safety gap to prevent scratching the valve stem 220 during operation. The four threaded holes at the lower end of the rotating sleeve 130 adopt fine-pitch threads and are firmly connected to the main body part 121 to avoid loosening. The upper end of the rotating sleeve 130 is provided with an external thread and a rotating handle 132, which is convenient for the operator to apply force to realize the crushing operation of the packing 210. The stepped hole is used to store the first guide sleeve 171 made of polytetrafluoroethylene material, and its dimensional tolerance is strictly controlled to ensure the stable installation of the protective sleeve.

[0083] In some embodiments, the arrangement of the force - adding handles 141 of the movable sleeve 140 can reduce the labor intensity of the operator while ensuring operation safety. The force - adding handles 141 on both sides are ergonomically designed and have anti - slip textures on the surface, facilitating the operator to hold and apply force. The inner - hole size of the movable sleeve 140 is precisely matched with the rotating sleeve 130 to ensure the smoothness of their relative movement. The external thread of the movable sleeve 140 is designed with trapezoidal threads. When mating with the internal thread of the fixed sleeve 111, it has high transmission efficiency and good self - locking performance, and can accurately adjust the downward pressure applied to the rotating sleeve 130 to achieve precise control of the crushing force on the packing 210.

[0084] In some embodiments, please refer to Figure 6 As shown, the fixing frame 110 includes a fixed sleeve 111 and a plurality of connecting parts 112. The fixed sleeve 111 is sleeved outside the movable sleeve 140. The plurality of connecting parts 112 are connected to the fixed sleeve 111 and are circumferentially spaced apart along the fixed sleeve 111. The connecting part 112 is provided with a long hole 1121 extending along the radial direction of the fixed sleeve 111. The long hole 1121 is connected to the yoke 240 of the valve 200 through a fastener.

[0085] The fixed sleeve 111 is provided with a rotating screw hole 1111. The movable sleeve 140 is screwed into the fixed sleeve 111. The connecting part 112 is in a long - strip structure and extends along the radial direction of the fixed sleeve 111. The number of the connecting parts 112 is multiple, and the multiple connecting parts 112 are circumferentially spaced apart along the fixed sleeve 111. The connecting part 112 is provided with a long hole 1121, and the long hole 1121 extends along the radial direction of the fixed sleeve 111. In this way, fasteners such as bolts and screws can move along the extending direction of the long hole 1121 to be connected to the yoke 240 of valves 200 with different sizes, so that the removing device 100 can be fixed on valves 200 with different sizes to meet the requirements for removing the packing 210 of valves 200 with different sizes.

[0086] In some embodiments, the fixing frame 110 is made of high - quality carbon steel and is surface - galvanized to enhance the anti - corrosion ability. The four connecting parts 112 are similar to a "cross" structure, and the position accuracy of the four long holes 1121 is high. When connected to the yoke 240 of the valve 200 through bolts, it can ensure that the device is firmly installed without displacement. The matching degree between the rotating screw hole 1111 in the fixed sleeve 111 and the thread of the movable sleeve 140 is high, ensuring the effective transmission of force. The machining accuracy of the internal thread of the fixed sleeve 111 is high, and it is stably matched with the movable sleeve 140, providing accurate guidance for the rotating sleeve 130 and stably applying the reaction force generated by the operation to the valve 200.

[0087] In some embodiments, components of the extraction device 100 according to the embodiments of the present application, such as bolts, nuts 150, rolling bearing sheets, etc., are all conventional standard parts on the market. Their functions, characteristics, and applications are widely recognized and mature and stable in the industry, which is beneficial to improving the use reliability of the extraction device 100 and also takes into account durability, ease of use, and economy.

[0088] In some cases, to remove the packing 210, it is necessary to stop the machine for drainage, require the water level to be below the height of the valve 200, and disassemble the valve 200 to replace the packing 210. The process is cumbersome and time-consuming, affecting the normal operation of nuclear power. The extraction device 100 according to the embodiments of the present application can realize the removal of the packing 210 when the valve 200 is in online operation without stopping the machine, ensuring the continuity of nuclear power operation, greatly improving the maintenance efficiency, avoiding huge economic losses caused by stopping the machine, and at the same time reducing the safety risks brought by complex shutdown operations, effectively ensuring personnel safety.

[0089] In some cases, when facing small-sized valves 200 and small-sized packing glands 201, there is often no way to do anything, resulting in a maintenance gap. The extraction device 100 according to the embodiments of the present application can flexibly adapt to small-sized valves 200 and small-sized packing glands 201 through the long strip holes 1121 of the fixing frame 110, filling this technical gap, expanding the application scenarios, and enabling effective maintenance of nuclear-grade valves 200 of different specifications.

[0090] In some cases, when removing the packing 210, it is easy to damage the packing gland 201 and the valve stem 220 due to improper operation, shortening the service life of the valve 200. Through the design of the first guide sleeve 171 and the second guide sleeve 172, the extraction device 100 according to the embodiments of the present application not only realizes precise guidance during operation but also comprehensively protects the packing gland 201 and the valve stem 220, effectively extending the service life of the valve 200 and reducing the maintenance cost.

[0091] In some cases, the packing 210 replacement process is complicated, involving multiple-step operations and prone to human errors. The extraction device 100 according to the embodiments of the present application integrates the removal, cleaning, and installation of the packing 210, simplifies the operation process, reduces the operation steps and time, reduces the risk of human operation errors, and significantly improves the overall replacement efficiency.

[0092] In some cases, it is difficult to accurately control the force when removing the packing 210, which is likely to cause equipment damage or incomplete removal of the packing 210. By means of the rotation of the movable sleeve 140, the extraction device 100 according to the embodiments of the present application enables the operator to accurately adjust the force for breaking the packing 210 according to the material of the packing 210, the degree of aging, and the working conditions of the valve 200, realizing safe and efficient removal.

[0093] For the extraction device 100 according to the embodiment of the present application, the moving sleeve 140 and the hooking member 120 are connected by means of screws, bolts, etc., so that the hooking member 120 can be detached from the moving sleeve 140, and then replaced with other components to meet the removal requirements of other components of the valve 200; for example, the extraction device 100 can replace the hooking member 120 and the lantern ring 230 connection mechanism at any time through the simple connection mechanism at the lower end of the moving sleeve 140, and the components such as the upper moving sleeve 140 can be shared to achieve the extraction of the packing 210 and the lantern ring 230, which simplifies the operation process, reduces the operation steps and time, reduces the risk of manual operation errors, and improves the overall replacement efficiency.

[0094] In some cases, the operator needs to consume a lot of physical strength to counteract the reaction force, resulting in a high labor intensity. The extraction device 100 according to the embodiment of the present application utilizes the external thread of the moving sleeve 140 to cooperate with the internal thread of the fixed sleeve 111 to transfer the reaction force to the yoke 240 of the valve 200, greatly reducing the labor intensity, making the replacement operation of the packing 210 easier and more efficient, and improving the operation and maintenance efficiency.

[0095] The extraction device 100 according to the embodiment of the present application can quickly and efficiently complete the extraction operation of the packing 210 without draining and isolating and without completely disassembling the valve 200 when the valve 200 is in online operation, greatly shortening the maintenance time of the valve 200 and improving the maintenance efficiency. By optimizing the structure and operation mode of the extraction device 100, the operation time of the maintenance personnel during the operation is reduced, the radiation dose received is reduced, and at the same time, the stability and reliability of the extraction device 100 during the operation are ensured, and the safety accidents caused by the failure of the extraction device 100 are reduced.

[0096] The extraction device 100 according to the embodiment of the present application is a device that can be applied to the extraction of the packing 210 and the lantern ring 230 of various different types and specifications of nuclear-grade valves 200, improving the versatility and applicability of the device, reducing the types and quantities of tools reserved by the nuclear power plant maintenance department to meet the maintenance requirements of different valves 200, and reducing the maintenance cost.

[0097] During the process of extracting the packing 210, the acting force is precisely controlled to minimize the damage to the packing 210 itself and other key components of the valve 200, ensuring that the valve 200 can restore its original performance and reliability after maintenance, and guaranteeing the safe and stable operation of the nuclear power plant.

[0098] The extraction device 100 according to the embodiment of the present application can achieve the online removal of the packing 210 without disassembling the valve 200 while the valve 200 is operating normally. At the same time, its unique design enables it to adapt to valves 200 and packing boxes 201 with smaller sizes, effectively expanding the application range. In addition, during the process of removing the packing 210, the device can ensure that the packing box 201 and the valve stem 220 are not damaged, protecting the original structure and performance of the valve 200 to the greatest extent, and providing a strong guarantee for the safe and stable operation of the nuclear power plant. The extraction device 100 according to the embodiment of the present application not only significantly improves the maintenance efficiency, reduces the risk of human error, greatly saves the maintenance time and reduces the radiation dose received by personnel, but also fundamentally guarantees the long-term stable operation of the valve 200, which is of great significance for improving the safety, reliability and economy of the industrial production system.

[0099] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. The similarities or similarities between them can be referred to each other. For the sake of brevity, they will not be repeated herein.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A removal device, applicable to removing the packing of a valve, characterized in that The extraction device includes: A fixing frame for fixing to the valve; A hooking member having a main body portion and a hooking portion, the hooking portion being connected to one end of the main body portion, and the hooking portion being used for hooking with the packing; A rotating sleeve for sleeving outside the valve stem of the valve, one end of the rotating sleeve being fixedly connected to the other end of the main body portion, and the rotating sleeve being used for driving the hooking portion to rotate around the axis of the rotating sleeve; A moving sleeve sleeved outside the rotating sleeve, the moving sleeve being movably connected to the fixing frame, and the moving sleeve being used for pushing the rotating sleeve to move back and forth along its own axis.

2. The taking-out device according to claim 1, wherein: The fixing frame is provided with a rotating screw hole, and the moving sleeve is screwed into the rotating screw hole.

3. The taking-out device according to claim 2, characterized in that: The hooking portion extends obliquely along the circumferential direction of the rotating sleeve; the rotating hooking direction of the rotating sleeve is the same as the oblique extension direction of the hooking portion. When the moving sleeve pushes the rotating sleeve to move towards the hooking member, the rotating direction of the moving sleeve is opposite to the rotating hooking direction of the rotating sleeve.

4. The taking-out device according to claim 2, characterized in that: The pitch range of the moving sleeve is 2 mm to 6 mm.

5. The taking-out device according to any one of claims 1 to 4, characterized in that: The extraction device further includes a nut sleeved outside the rotating sleeve and screwed to the rotating sleeve, the nut being located at the end of the moving sleeve facing away from the hooking member and used for abutting against the moving sleeve.

6. The taking-out device according to claim 5, characterized in that: A first rolling bearing plate is provided between the nut and the moving sleeve.

7. The taking-out device according to any one of claims 1 to 4, characterized in that: The outer peripheral surface of the rotating sleeve has a stepped surface for abutting against the end of the moving sleeve close to the hooking member.

8. The taking-out device according to claim 7, characterized in that: A second rolling bearing plate is provided between the stepped surface and the end surface of the moving sleeve.

9. The taking-out device according to any one of claims 1 to 4, characterized in that: The extraction device further includes a first guide sleeve sleeved outside the valve stem of the valve and located inside the rotating sleeve, and / or, The extraction device further includes a second guide sleeve, the main body portion being sleeved outside the valve stem of the valve, and the second guide sleeve being sleeved outside the valve stem of the valve and located inside the main body portion.

10. The taking-out device according to any one of claims 1 to 4, characterized in that: The fixing frame includes a fixing sleeve and a plurality of connecting portions. The fixing sleeve is sleeved outside the moving sleeve, and the plurality of connecting portions are connected to the fixing sleeve and are spaced apart along the circumferential direction of the fixing sleeve. The connecting portion is provided with a long hole extending along the radial direction of the fixing sleeve, and the long hole is connected to the yoke of the valve through a fastener.

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