Valve expansion pushing dismounting tool

Abstract

The utility model relates to a valve expansion pushing disassembling tool which comprises a pushing bolt, an expansion ring with a contraction state and an expansion state, a locking sleeve and a locking piece. The expansion ring comprises a main body part and a pre-expansion part, and the inner diameter of the pre-expansion part is larger than that of the main body part; the pushing bolt is sleeved with the locking sleeve, the locking sleeve comprises a first section and a second section which are connected in the axial direction, the locking sleeve is sleeved with the expansion ring, and at least part of the expansion ring corresponds to the second section; the locking sleeve is sleeved with the locking piece, the locking piece abuts against the expansion ring in the axial direction, and the locking piece is in threaded connection with the first section in the axial direction in the mode that the locking piece can move relatively. And when the expansion ring is in the expansion state, the expansion ring is limited in the through hole of the valve cover, and at least part of the main body part corresponds to the second section. The valve cover is compact in structure and easy to operate, the valve cover can be conveniently detached from the valve body, and the operation time is greatly shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of valve disassembly and assembly tools, in particular to a valve expansion and pushing disassembly tool. Background Art

[0002] A large number of valves are used in nuclear power plant systems. When inspecting and repairing valves, the valve cover and valve body are often stuck and difficult to remove.

[0003] like Figure 1 As shown in the figure, a pressurizer spray valve in a nuclear power plant has a small gap between the guide part of the valve cover and the valve body, a long guide dimension, and a system medium temperature of nearly 300°C. Under long-term operation, the valve cover and the valve body are very likely to get stuck. The valve body of this valve is exposed to an environmental dose of about 1000uSv, a small space, and requires wearing paper clothes and oxygen masks to work, making the work difficult. When a jam occurs, it takes two workers more than 30 minutes to complete the disassembly work, which has a great impact on the workers' physical and psychological health under high-dose and high-intensity working conditions.

[0004] like Figure 2 As shown in the figure, a regulating valve in a nuclear power plant has a large valve cover torque and a small guide clearance. After the valve cover is tightened, it is easy for the valve cover and the valve body to get stuck after a major overhaul. Due to the large size of the valve and the heavy weight of the valve cover, it is difficult to remove the valve cover when it gets stuck. The valve cover needs to be pried out little by little from the valve cover clearance, which is time-consuming and easy to damage the valve. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a valve expansion and pushing disassembly tool.

[0006] Construct a valve expansion and pushing disassembly tool, including:

[0007] Push bolts used to push the valve body to remove the valve cover;

[0008] An expansion ring having a contracted state and an expanded state, comprising a main body and a pre-expansion part, wherein the inner diameter of the pre-expansion part is larger than the inner diameter of the main body;

[0009] A locking sleeve is sleeved outside the jacking bolt, is coaxially arranged with the jacking bolt, and is threadedly connected to move relatively in the axial direction, comprising a first section and a second section connected in the axial direction, the expansion ring is sleeved outside the locking sleeve, and at least partially corresponds to the second section; and

[0010] An annular locking member is sleeved outside the locking sleeve, abuts against the expansion ring along the axial direction, and is threadedly connected to the first section so as to be relatively movable along the axial direction;

[0011] Wherein, when the expansion ring is in the expanded state, it is confined in the through hole of the valve cover, and at least a part of the main body corresponds to the second section.

[0012] In some embodiments, the outer diameter of the second section gradually increases from one end close to the first section to one end away from the first section, and the inner diameter of the pre-expansion portion gradually increases from one end close to the main body to one end away from the main body.

[0013] In some embodiments, the angle between the outer surface of the second segment and the axis of the second segment is greater than or equal to 4° and less than or equal to 7°;

[0014] The inclination angle of the inner surface of the pre-expansion portion is adapted to the outer surface of the second section.

[0015] In some embodiments, the expansion ring includes an elastic retaining ring with a variable inner diameter and a plurality of bodies with arc-shaped horizontal cross-sections. The plurality of bodies are arranged in a ring shape, and each of the bodies is formed with a retaining ring limiting groove. The elastic retaining ring is limited in the retaining ring limiting groove. Each of the bodies includes a first part and a second part connected axially. The first parts of the plurality of bodies together constitute the main body, and the second parts of the plurality of bodies together constitute the pre-expansion part.

[0016] In some embodiments, the elastic clamp is provided with a plurality of limiting protrusions at intervals along the circumferential direction, and the body is provided between any two adjacent limiting protrusions.

[0017] In some embodiments, the cross-section of the retaining ring limiting groove is T-shaped, and / or the retaining ring limiting groove is located in the first part.

[0018] In some embodiments, the outer surface of the second portion is formed with at least one groove.

[0019] In some embodiments, a clamping ring is further included, which is sleeved outside the locking sleeve, and has two ends respectively abutting against the locking member and the expansion ring, including a control section close to the locking member and a clamping section close to the expansion ring, wherein the outer contour of the control section is larger than the aperture of the through hole of the valve cover, and the outer contour of the clamping section is adapted to the through hole, or smaller than the through hole.

[0020] In some embodiments, the clamping ring is magnetically connected to the expansion ring.

[0021] In some embodiments, at least a portion of the outer surface of the push bolt is provided with threads, the inner surface of the second section is provided with threads that cooperate with the threads on the outer surface of the push bolt, the inner diameter of the first section is larger than the inner diameter of the second section, and the outer surface of the first section and the inner surface of the locking member are provided with threads that cooperate with each other.

[0022] The utility model has the following advantages:

[0023] The valve expansion and pushing disassembly tool constructed by the utility model is formed by several parts which are nested with each other, has a compact structure and is easy to operate, and is convenient for disassembling the valve cover from the valve body, thus solving the problem that the valve cover is stuck and difficult to remove, and at the same time, its operating steps are simple, which greatly reduces the operating time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0025] Figure 1 It is a structural diagram of a pressurizer spray valve in a nuclear power plant;

[0026] Figure 2 It is a structural schematic diagram of a regulating valve in a nuclear power plant;

[0027] Figure 3 It is a structural schematic diagram of a valve expansion and pushing disassembly tool in one embodiment of the utility model;

[0028] Figure 4 yes Figure 3 A cross-sectional view of the valve expansion and push removal tool shown;

[0029] Figure 5 yes Figure 3 An exploded view of the valve expansion push removal tool is shown. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside", "inside", "outside", etc. are based on the directions or positional relationships shown in some of the drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the present technical solution, and do not indicate that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0031] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0032] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0033] Figures 3 to 5 The valve expansion and pushing disassembly tool 1 in one embodiment of the utility model is shown, which can quickly realize the disassembly between the valve cover and the valve body of the valve, save the valve disassembly time, and facilitate the operation. The valve expansion and pushing disassembly tool 1 includes an expansion ring 10, a pushing bolt 20, a locking sleeve 30 and a locking member 40.

[0034] The push bolt 20 is in the shape of a longitudinal round rod, and at least part of the outer surface is provided with threads, which is used to push the valve body to remove the valve cover from the valve body. The expansion ring 10 has a variable inner diameter, and is used to be limited in the through hole of the valve cover during the removal of the valve cover, and is relatively fixed to the valve cover, so that the valve cover and the valve body can be removed by pushing the valve body with the push bolt 20. The expansion ring 10 includes a main body and a pre-expansion part, and the inner diameter of the pre-expansion part is larger than the main body. The expansion ring 10 includes a contracted state and an expanded state. When the expansion ring 10 is in the expanded state, it is limited in the through hole of the valve cover, that is, it is relatively fixed to the valve cover. When the expansion ring 10 is in the contracted state, it is not relatively fixed with the valve cover.

[0035] The locking sleeve 30 is sleeved outside the push bolt 20, is coaxially arranged with the push bolt 20, and is threadedly connected in an axially relatively movable manner, and includes a first section 31 and a second section 32 connected in the axial direction. Among them, the expansion ring 10 is sleeved outside the locking sleeve 30, and at least partially corresponds to the second section 32. The second section 32 is used to change the inner diameter of the expansion ring 10, that is, to expand the expansion ring 10 so that the expansion ring 10 is fixed to the valve cover. When the expansion ring 10 is in an expanded state, at least part of the main body corresponds to the second section 32. When the expansion ring 10 is in a contracted state, the main body does not correspond to the second section 32.

[0036] The locking piece 50 is annular, sleeved outside the first section 31, and is threadedly connected to the first section 31 for axial relative movement. At the same time, the locking piece 50 is also axially abutted against the expansion ring 10. The expansion ring 10 can be fixed in the axial direction and the locking piece 50 can be controlled so that the locking piece 50 and the first section 31 can move relative to each other in the axial direction. The expansion ring 10 axially abutting against the locking piece 50 can move relative to the locking sleeve 30 in the axial direction. Therefore, the expansion ring 10 and the second section 32 can move relative to each other in the axial direction, and the main body gradually corresponds to the second section 32. The expansion ring 10 gradually changes from a contracted state to an expanded state, and the expansion ring 10 is expanded and fixed relative to the valve cover.

[0037] At this time, the expansion ring 10 continues to be fixed in the axial direction, and the push bolt 20 is screwed to make the push bolt 20 move relative to the locking sleeve 30 in the axial direction (because the expansion ring 10 is supported to the expanded state by the second section 32 of the locking sleeve 30 at this time, there will be no axial relative movement between the expansion ring 10, the valve cover and the locking sleeve 30 due to the friction force. On the contrary, it will be further subjected to the force applied by the threaded connection of the push bolt 20, thereby strengthening the mutual extrusion between the expansion ring 10 and the valve cover, making the contact between the expansion ring 10 and the valve cover closer and avoiding relative movement). Therefore, by controlling the push bolt 20 and the locking sleeve 30 to move relative to each other in the axial direction at this time, the push bolt 20 can realize the pushing of the valve body, thereby allowing the valve cover and the valve body to be disassembled.

[0038] The valve expansion and pushing disassembly tool 1 is formed by several parts which are nested with each other, has a compact structure, and is easy to operate, so as to facilitate the disassembly of the valve cover from the valve body, solve the problem that the valve cover is stuck and difficult to remove, thereby reducing the operation time and thus reducing the radiation dose of the staff.

[0039] It should be understood that the valve expansion and pushing disassembly tool 1 is only described by taking the valve of a nuclear power plant as an example, and it has a wide range of applicability and can be used without space restrictions as long as there is a bolt hole.

[0040] like Figure 5 As shown, in this embodiment, the locking member 50 is a hexagonal nut with threads on the inner wall surface, so that it is easy to rotate it manually or by equipment during the process of disassembling the valve cover.

[0041] In some other optional embodiments, the outer contour of the locking member 50 can also be other structures such as a pentagon, a circle, an irregular shape, or a connecting structure such as a hanging ear is provided on the outer surface, and the connecting structure is connected by a rotating device to control the rotation of the locking member 50.

[0042] In some embodiments, the expansion ring 10 is a split expansion ring, including an elastic snap ring 12 and a plurality of bodies 11, so as to achieve better expansion performance and fit closely with the extruded surface (the inner wall surface of the through hole of the valve cover). The horizontal cross section of the body 11 is arc-shaped, and the plurality of bodies 11 can be arranged in a ring shape, and the conversion between the contraction state and the expansion state of the expansion ring 10 can be achieved by changing the gap between adjacent bodies 11. The elastic snap ring 12 is used to connect the various bodies 11 to each other so that they are combined to form a whole. In the expanded state, its inner diameter is also correspondingly enlarged. In the contracted state, it can ensure the rebound of the expansion ring, so that the plurality of bodies 11 can contract.

[0043] Specifically, each body 11 is formed with a retaining ring limiting groove 113 for accommodating an elastic retaining ring 12. The elastic retaining ring 12 is simultaneously passed through and limited in the retaining ring limiting groove 113 of each body 11, thereby realizing the connection of all the bodies 11, so that all the bodies 11 are surrounded to form an annular structure. Among them, each body 11 includes a first part 111 and a second part 112, and the first part 111 and the second part 112 are mutually connected along the axial direction. The first parts 111 of all the bodies 11 together constitute the main body of the expansion ring 10, and the second parts 112 of all the bodies 11 together constitute the pre-expansion part of the expansion ring 10.

[0044] In some embodiments, the elastic snap ring 12 includes an annular ring body 121 and a plurality of limiting protrusions 122, and the plurality of limiting protrusions 122 are evenly spaced along the circumferential direction on the outer surface of the ring body 121, and the limiting protrusions 122 cannot enter the snap ring limiting groove 113 of the body 11, thereby playing a limiting role to prevent the body 11 from moving back and forth along the circumferential direction on the elastic snap ring 12. A body 11 is disposed between any two adjacent limiting protrusions 122.

[0045] Read also Figure 4 In this embodiment, the ring body 121 is in the form of a sheet, and its cross section is rectangular, and an elastic opening 1211 is formed, so that when the expansion ring 10 is in the expanded state, the ring body 121 can produce elastic deformation, thereby expanding the inner diameter. At the same time, when the push is completed and it needs to be removed from the valve cover, it can automatically shrink due to its own elastic properties when loosening, so that the expansion ring 10 is automatically separated from the squeezed surface (the inner wall surface of the valve cover through hole). The clamping ring limiting groove 113 is formed on the inner surface of the body 11 and on the first part 111 of the body 11. Its cross section is T-shaped, and the ring body 121 is limited in the horizontal end of the T-shaped.

[0046] In some other optional embodiments, the snap ring limiting groove 113 may also be formed on the outer surface of the body 11. It may also be formed on the second portion 112 of the body 11. The cross section of the ring body 121 may also be in an arc shape or other shapes, so that the cross section shape of the snap ring limiting groove 113 is adapted thereto.

[0047] In some other optional embodiments, the limiting protrusion 122 can also be formed on the inner surface of the ring body 121. It can be rectangular, circular, irregular, etc.

[0048] In some other optional embodiments, the elastic clamp ring 12 may not be provided with the elastic opening 1211, and the elastic clamp ring 12 may be provided in a closed ring shape by using a material having its own telescopic deformation properties.

[0049] For example Figure 5As shown, in some embodiments, the outer surface of the second portion 112 is further formed with at least one groove 114, which is used to increase the friction between the second portion 112 and the inner wall surface of the through hole of the valve cover when the metal is slightly squeezed and deformed, thereby preventing relative movement during the pushing process.

[0050] In this embodiment, the grooves 114 are two annular grooves, which are arranged on the second portion 112 at intervals along the horizontal direction.

[0051] In some other optional embodiments, the number of the grooves 114 can be one, three or more, which can be vertical grooves parallel to the axial direction of the expansion ring 10, or spiral grooves. They can also be arranged on the first part 111, or on both the first part 111 and the second part 112.

[0052] like Figure 4 and Figure 5 As shown, in some embodiments, the push bolt 20 includes a bolt head 21, a first bolt segment 22 and a second bolt segment 23. The first bolt segment 22 is located between the bolt head 21 and the second bolt segment 23, and the three are coaxially arranged, and the outer surface of the second bolt segment 23 is provided with a thread for threaded connection with the locking sleeve 30.

[0053] In this embodiment, the bolt head 21 is a hexagonal bolt head, so that it can be screwed during the pushing process. The second bolt section 23 is also provided with a polished rod section at one end away from the first bolt section 22, which can avoid thread damage and difficulty in removal.

[0054] In some other optional embodiments, the first bolt section 22 may also be provided with threads.

[0055] The outer surface of the first section 31 of the locking sleeve 30 is provided with threads for threaded connection with the locking member 50. The inner surface of the second section 32 is provided with threads for threaded connection with the second bolt section 23 of the jacking bolt 20. The inner diameter of the first section 31 is larger than the inner diameter of the second section 32 to avoid mutual friction with the outer surface of the second bolt section 23 of the jacking bolt 20. The setting of the locking sleeve 30 can facilitate the insertion of the jacking bolt 20, so that the valve expansion jacking disassembly tool 1 has a compact structure. The direction of the force applied by the jacking bolt 20 is opposite to the direction of force applied to the locking sleeve 30. The greater the jacking force applied by the jacking bolt 20 during the jacking disassembly step, the greater the force applied to the locking sleeve 30, and the tighter the expansion ring 10 and the extruded part (i.e., the valve cover) are.

[0056] In some embodiments, the outer diameter of the second section 32 gradually increases from the end close to the first end 31 to the end away from the first end 31, and the inner diameter of the pre-expansion portion gradually increases from the end close to the main body to the end away from the main body, and the two are adapted to each other. When the expansion ring 10 is in a contracted state, the two are at least partially in contact with each other, so that the expansion ring 10 can expand to an expanded state.

[0057] Specifically, the angle between the outer surface of the second section 32 and the axis of the second section 32 is greater than or equal to 4° and less than or equal to 7°. The inclination angle of the inner surface of the pre-expansion portion is adapted to the outer surface of the second section 32, that is, the angle between the second part 112 of the main body 11 and the axis of the expansion ring 10 is also greater than or equal to 4° and less than or equal to 7°. The specific inclination angle between the outer surface of the second section 32 and the inner surface of the pre-expansion portion can make the horizontal outward component of the force applied to the expansion ring 10 during the expansion of the expansion ring 10 much greater than the upward thrust, so that the expansion ring 10 can fit tightly to the extruded surface (i.e., the inner wall surface of the valve cover through hole) and is not easy to fall off. At the same time, after the top push disassembly is completed, it is also easy to separate the locking sleeve 30 from the expansion ring 10 for easy removal.

[0058] In some embodiments, the locking sleeve 30 further includes a third section 33, which is disposed between the first section 31 and the second section 32 to increase the axial length of the locking sleeve 30 and is used to correspond to the main body of the expansion ring 10. The inner diameter of the main body of the expansion ring 10 is adapted to the outer diameter of the third section 33.

[0059] In this embodiment, the third section 33 has the same outer diameter as the first section 31 , and the second section 32 has an outer diameter greater than the third section 33 and the first section 31 . The second section 32 has an inner diameter less than the first section 31 and the third section 33 .

[0060] In some other optional embodiments, the inner diameter of the first section 31 and the third section 33 may also be set to be the same as the inner diameter of the second section 32, and may also be provided with threads for threaded connection with the thrust bolt 20. The outer surface of the third section 33 may also be provided with threads for threaded connection with the locking member 50.

[0061] For example Figure 3 As shown, in some embodiments, the valve expansion pushing and disassembly tool 1 also includes a clamping ring 40, which is sleeved outside the locking sleeve 30, and its two ends are respectively abutted against the locking piece 50 and the expansion ring 10, and is used to cooperate with the locking piece 50 and the locking sleeve 30 to achieve expansion of the expansion ring 10.

[0062] Read also Figure 4 and Figure 5Specifically, the clamping ring 40 includes a control section 41 and a clamping section 42. The control section 41 is arranged close to the locking member 50, and its outer contour is larger than the aperture of the through hole of the valve cover, and is used to control the control section 41 to resist the expansion ring 10 during the process of twisting the locking member 50 to make the locking member 50 and the locking sleeve 30 move relative to each other in the axial direction, so that the expansion ring 10 can achieve axial relative movement with the locking sleeve 30, and then the second section 32 of the locking sleeve 30 can open the expansion ring 10, and the two are tightly connected, generating a large friction force, and no relative movement occurs, thereby preventing the locking sleeve 30 from rotating with the locking member 50. The clamping section 42 is arranged close to the expansion ring 10, and its outer contour size is adapted to the through hole of the valve cover, or smaller than the through hole, so that it can be closely abutted with the expansion ring 10 at all times during the process of pushing and disassembling.

[0063] In this embodiment, the outer contour of the cross section of the control section 41 is hexagonal, so as to prevent it from rotating by a wrench or the like.

[0064] In some embodiments, the inner diameter of the control section 41 is adapted to the outer diameters of the first section 31 and the third section 33 of the locking sleeve 30, and the inner diameter of at least a portion of the section of the clamping section 42 away from the control section 41 is larger than the inner diameter of the control section 41, so that in the process of twisting the locking piece 50 and the locking sleeve 30 to produce relative movement, if the entire expansion ring 10 corresponds to the second section 32, even the end of the clamping section 42 close to the expansion ring 10 also corresponds to the second section 32, it is avoided that the end of the clamping section 42 close to the expansion ring 10 and the second section 32 are clamped with each other.

[0065] In some embodiments, the clamping ring 40 is magnetic and can be tightly connected to the expansion ring 10 through magnetic attraction. This allows for different expansion rings 10 to be used in bolt holes of different diameters, which has wider applicability. At the same time, the magnetic attraction structure also facilitates overall installation and disassembly.

[0066] It should be understood that the magnetism of the clamping ring 40 can be located only in the clamping section 42, or only in one end of the clamping section 42 close to the expansion ring 10, or in other parts. It only needs to ensure that the clamping ring 40 and the expansion ring 10 can be tightly connected.

[0067] In some other optional embodiments, the clamping ring 40 may not be provided, and the above-mentioned effect may be achieved by changing the structure of the expansion ring 10, such as setting it as an expansion ring with expandable ends, or changing the structure of the locking member 50.

[0068] It should be understood that, in the present embodiment, all components of the valve expansion and pushing disassembly tool 1 are metal structures.

[0069] In the specific use process, taking a valve in a nuclear power plant as an example, firstly, the connecting piece (usually a bolt) connecting the valve cover and the valve body needs to be removed from the valve, so that the valve cover exposes the through hole, and the valve expansion and pushing disassembly tool 1 is placed in the through hole. At this time, the expansion ring 10 is in a contracted state.

[0070] Furthermore, the control section 41 of the clamping ring 40 is controlled by a wrench or other components to prevent it from rotating, and the locking member 50 is screwed so that the locking member 50 and the first section 31 of the locking sleeve 30 produce relative movement along the axial direction due to the threaded connection.

[0071] During this process, since the clamping ring 40 and the expansion ring 10 abut against the locking member 50 in turn, the clamping ring 40 and the expansion ring 10 also produce relative movement along the axial direction with the locking sleeve 30. Therefore, the main body of the expansion ring 10 gradually corresponds to the second section 32 of the locking sleeve 30, and the gradually expanding outer diameter of the second section 32 applies force to the main body, so that the multiple bodies 11 constituting the main body are separated from each other, and the elastic clamp 12 is deformed and the inner diameter increases. At this time, the expansion ring 10 gradually changes to an expanded state.

[0072] Furthermore, when the locking member 50 cannot be turned, the expansion ring 10 can be assumed to be tightly connected to the inner wall surface of the valve cover through hole, the second section 32 is tightly connected to the inner wall surface of the expansion ring 10, and the three are tightly connected and relatively fixed.

[0073] At this time, the tightening of the locking member 50 is stopped, and the bolt head 21 of the thrust bolt 20 is tightened, so that the second bolt section 23 of the thrust bolt 20 and the second section 32 of the locking sleeve 30 threadedly connected thereto generate relative movement in the axial direction.

[0074] During this process, since the second section 32, the expansion ring 10, and the inner wall surface of the valve cover through-hole are tightly connected and relatively fixed, and the turning of the push bolt 20 applies friction to the second section 32 of the locking sleeve 30, the second section 32 of the locking sleeve 30 further applies force to the expansion ring 10 and the inner wall surface of the valve cover through-hole, the three are further relatively tightly fixed, and there is no relative movement with the valve cover. The push bolt 20 that has generated relative movement with the locking sleeve 30 then generates relative movement relative to the valve cover, i.e., it is pushed into the hole of the valve body until the end portion abuts against the bottom end of the hole of the valve body. At this time, the bolt head 21 of the push bolt 20 is further turned, i.e., a push force is applied to the valve body, so the valve cover can be removed from the valve body.

[0075] Furthermore, after the disassembly is completed, the locking member 50 is twisted in the opposite direction, so that the locking member 50, the clamping ring 40, the expansion ring 10 and the locking sleeve 30 can move relative to each other in the opposite direction along the axial direction. The main body of the expansion ring 10 gradually moves away from the second section of the locking sleeve 30, and the elastic clamping ring 12 automatically shrinks due to its own elastic force, and the expansion ring 10 automatically shrinks back to the contracted state. At this time, the valve expansion push disassembly tool 1 can be removed from the valve cover.

[0076] It should be understood that when the valve cover and the valve body are connected by multiple connecting parts (such as a circle of connecting parts arranged along the circumference), the valve expansion pushing and disassembly tool 1 can be placed in all the through holes along the circumference (or several are evenly spaced along the circumference), and the above operations can be performed simultaneously to ensure the consistency of the pushing, so as to realize the disassembly of the valve cover and the valve body.

[0077] Furthermore, by applying the above steps in reverse, the valve cover can be installed to prevent the valve cover gasket from being sheared.

[0078] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A valve expansion and pushing disassembly tool, characterized in that: include: A push bolt (20) for pushing the valve body to remove the valve cover; An expansion ring (10) having a contracted state and an expanded state, comprising a main body portion and a pre-expansion portion, wherein the inner diameter of the pre-expansion portion is greater than the inner diameter of the main body portion; a locking sleeve (30) sleeved outside the thrust bolt (20), coaxially arranged with the thrust bolt (20), and threadedly connected so as to be relatively movable in the axial direction, comprising a first section (31) and a second section (32) connected in the axial direction, the expansion ring (10) sleeved outside the locking sleeve (30), and at least partially corresponding to the second section (32); and an annular locking member (50) sleeved outside the locking sleeve (30), abutting against the expansion ring (10) along the axial direction, and being threadedly connected to the first section (31) so as to be relatively movable along the axial direction; Wherein, when the expansion ring (10) is in the expanded state, it is confined in the through hole of the valve cover, and at least a part of the main body corresponds to the second section (32).

2. The valve expansion and pushing disassembly tool according to claim 1 is characterized in that: The outer diameter of the second section (32) gradually increases from an end close to the first section (31) to an end away from the first section (31), and the inner diameter of the pre-expansion portion gradually increases from an end close to the main body to an end away from the main body.

3. The valve expansion and pushing disassembly tool according to claim 2 is characterized in that: The angle between the outer surface of the second section (32) and the axis of the second section (32) is greater than or equal to 4° and less than or equal to 7°; The inclination angle of the inner surface of the pre-expansion portion is adapted to the outer surface of the second section (32).

4. The valve expansion and pushing disassembly tool according to claim 1 is characterized in that: The expansion ring (10) comprises an elastic clamping ring (12) with a variable inner diameter and a plurality of bodies (11) with arc-shaped horizontal cross-sections. The plurality of bodies (11) are arranged in a ring shape. Each of the bodies (11) is formed with a clamping ring limiting groove (113). The elastic clamping ring (12) is limited in the clamping ring limiting groove (113). Each of the bodies (11) comprises a first part (111) and a second part (112) connected in the axial direction. The first parts (111) of the plurality of bodies (11) together constitute the main body, and the second parts (112) of the plurality of bodies (11) together constitute the pre-expansion part.

5. The valve expansion and pushing disassembly tool according to claim 4 is characterized in that: The elastic clamping ring (12) is provided with a plurality of limiting protrusions (122) at intervals along the circumferential direction, and the body (11) is provided between any two adjacent limiting protrusions (122).

6. The valve expansion and pushing disassembly tool according to claim 4 is characterized in that: The cross section of the snap ring limiting groove (113) is T-shaped, and / or the snap ring limiting groove (113) is located in the first part (111).

7. The valve expansion and pushing disassembly tool according to claim 4 is characterized in that: At least one groove (114) is formed on the outer surface of the second portion (112).

8. The valve expansion and pushing disassembly tool according to claim 1 is characterized in that: The invention also includes a clamping ring (40), which is sleeved outside the locking sleeve (30) and has two ends respectively abutting against the locking member (50) and the expansion ring (10), and includes a control section (41) close to the locking member (50) and a clamping section (42) close to the expansion ring (10), wherein the outer contour of the control section (41) is larger than the aperture of the through hole of the valve cover, and the outer contour of the clamping section (42) is matched with the through hole or smaller than the through hole.

9. The valve expansion and pushing disassembly tool according to claim 8, characterized in that: The clamping ring (40) is magnetically connected to the expansion ring (10).

10. The valve expansion and pushing disassembly tool according to claim 1, characterized in that: At least part of the outer surface of the push bolt (20) is provided with threads, the inner surface of the second section (32) is provided with threads that cooperate with the threads on the outer surface of the push bolt (20), the inner diameter of the first section (31) is larger than the inner diameter of the second section (32), and the outer surface of the first section (31) and the inner surface of the locking member (50) are provided with threads that cooperate with each other.

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