A pulling-out device and its installation and use method

Abstract

The application discloses a lifting and pulling-out device and a mounting and using method thereof, wherein the lifting and pulling-out device is used for lifting and pulling out a valve leakage ring, and the lifting and pulling-out device comprises a supporting structure and a lifting structure. The supporting structure is sleeved on a valve rod, the supporting structure abuts against a yoke, and an operation space is formed between the supporting structure and the yoke. The lifting structure is arranged in the operation space and comprises a rotating part and a lifting part. The rotating part is rotationally connected with the supporting structure, the rotating part is sleeved on the valve rod, one end of the lifting part is arranged on one side of the rotating part facing the yoke, the other end of the lifting part is connected with the valve leakage ring, and the lifting part does not rotate with the rotating part. The lifting and pulling-out device is simple in structure, convenient to operate, can directly take out the valve leakage ring as a whole, and improves the replacement efficiency of a sealing element.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant valve technology, and in particular to a pull-out device and its installation and usage method. Background Technology

[0002] Electric gate valves for nuclear power plants are mainly used in pipelines of various systems in thermal power plants to cut off or connect pipeline media. The valve stem sealing assembly in an electric gate valve for nuclear power plants typically includes upper packing, a valve leakage ring in the middle, and lower packing. Due to the relative movement between the valve stem and the upper and lower packing, failure may occur after prolonged use due to a decline in sealing quality. To prevent electric gate valve failure, the upper and lower packing need to be replaced periodically.

[0003] Due to limitations, the electric gate valve could not be removed from the entire system, nor could it be disassembled online. The valve yoke and electric actuator could not be removed. It was necessary to remove the upper packing and the valve drain ring in sequence before replacing the lower packing. Corrosion generated during operation and foreign objects from packing wear became stuck between the valve drain ring and the inner wall of the stuffing box, preventing the valve drain ring from being removed.

[0004] In the prior art, application number CN201911112179.9 describes an online replacement device and method for a valve leak ring. This method requires cutting the valve leak ring into an inner ring and an outer ring, and then removing the inner and outer rings in sequence. On the one hand, this replacement device has a complex structure and operation, and it also adds the step of removing the valve leak ring, reducing the removal efficiency of the valve leak ring. On the other hand, the valve leak ring is rendered ineffective after cutting and cannot be used, requiring replacement with a new valve leak ring, which increases the replacement cost. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] In view of this, the present invention provides a lifting and removal device and its installation and use method, wherein the lifting and removal device has a simple structure and is easy to operate, and can directly remove the valve leakage ring as a whole, thereby improving the replacement efficiency of the seal.

[0007] Specifically, the following technical solutions are included:

[0008] A first aspect of the present invention provides a pull-out device for pulling out a valve leakage ring, the pull-out device comprising a support structure and a pull-out structure, wherein:

[0009] The support structure is sleeved on the valve stem, the support structure abuts against the yoke, and an operating space is formed between the support structure and the yoke;

[0010] The lifting structure is disposed within the operating space. The lifting structure includes a rotating part and a lifting part. The rotating part is rotatably connected to the support structure and is sleeved on the valve stem. One end of the lifting part is disposed on the side of the rotating part facing the yoke, and the other end of the lifting part is connected to the valve leakage ring. The lifting part does not rotate with the rotating part.

[0011] Optionally, the rotating part is a lifting nut, the lifting part includes a lifting sleeve and a pulling screw, the lifting nut and the lifting sleeve are sleeved on the valve stem, the lifting nut is rotatably connected to the support structure, the first end of the plurality of pulling screws is connected to the lifting sleeve, and the second end of the pulling screw is connected to the valve leakage ring.

[0012] Optionally, a first hanging ring is provided on the outer periphery of the lifting nut, the axial cross section of the first hanging ring is "L" shaped, the diameter of the lifting sleeve is larger than the diameter of the lifting nut, and a second hanging ring is provided on the side of the lifting sleeve facing the lifting nut, the axial cross section of the second hanging ring is inverted "L" shaped, and the first hanging ring matches the second hanging ring.

[0013] Optionally, the lifting nut includes a pair of split nuts, the pair of split nuts forming an annular structure, and the lifting loop includes a pair of split loops, the pair of split loops forming an annular structure.

[0014] Optionally, the outer periphery of the lifting loop is provided with a plurality of first operating holes.

[0015] Optionally, the support structure includes:

[0016] A support ring plate is sleeved on the valve stem. A threaded sleeve is fixed on the side of the support ring plate facing the yoke. The threaded sleeve is sleeved on the valve stem. The rotating part is rotatably connected to the threaded sleeve.

[0017] All support screws are provided on the support ring plate. The first end of the support screw is connected to the support ring plate, and the second end of the support screw abuts against the yoke. The support ring plate and the support screws form the operating space. The support screws are located on the outside of the lifting part.

[0018] The support ring plate and the threaded sleeve are integrally formed.

[0019] Optionally, the support structure includes at least two of the support screws.

[0020] Optionally, a plurality of second operating holes are uniformly provided on the outer periphery of the rotating part, and the second operating holes are used to rotate the rotating part.

[0021] A second aspect of the present invention provides a method for installing and using a lifting and removing device, the method comprising the following steps:

[0022] Preparations before installing the lifting and extraction device;

[0023] Install multiple pull-out screws on the valve's leakage ring;

[0024] Based on the site conditions, install a support ring plate and threaded sleeve on the valve stem, and also install a support screw.

[0025] Install the lifting nut on the end of the threaded sleeve away from the support ring plate, and install the lifting loop on the end of the lifting nut away from the support ring plate;

[0026] One end of the multiple pull-out screws away from the valve leakage ring is fixedly connected to the lifting loop;

[0027] The lifting and extraction device is leveled.

[0028] Rotate the lifting nut to move it on the threaded sleeve toward the support ring plate until the valve drain ring is pulled out and the lower packing is removed.

[0029] Optionally, the preparation work includes:

[0030] First, remove the upper packing of the valve drain ring and clean the residue on the upper surface of the valve drain ring, the valve stem, and the inner wall of the stuffing box.

[0031] The present invention provides a pull-out device and its installation and usage method. The pull-out device includes a support structure and a pull-out structure. The support structure abuts against the yoke and supports the rising and falling of the pull-out structure. The pull-out structure includes a rotating part and a pulling part. The rotating part is rotatably connected to the support structure and is sleeved on the valve stem. The pulling part does not rotate with the rotating part. One end of the pulling part is located on the side of the rotating part facing the yoke, and the other end of the pulling part is connected to the valve drain ring. By rotating the rotating part, the pulling part is driven to rise, thereby driving the valve drain ring below the pulling part to rise, pulling out the valve drain ring, and then removing the lower packing, thus realizing the replacement of the valve stem seal. The pull-out device has a simpler structure, is easier to operate, and improves the replacement efficiency of the valve stem seal.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a lifting and removing device according to an embodiment of the present invention;

[0035] Figure 2 for Figure 1 The front view of the embodiment shown;

[0036] Figure 3 A schematic diagram showing the connection between the lifting nut and the lifting looper according to an embodiment of the present invention is shown;

[0037] Figure 4 This is a flowchart illustrating the steps of installing and using a lifting and removing device according to an embodiment of the present invention.

[0038] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0039] 100 Lifting and removing device, 110 Support structure, 111 Support ring plate, 112 Threaded sleeve, 113 Support screw, 120 Lifting structure, 121 Lifting nut, 1211 First hanging ring, 122 Lifting loop, 1221 Second hanging ring, 123 Pulling screw, 200 Valve, 210 Lower packing, 220 Valve drain ring, 230 Yoke, 240 Valve stem. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Before providing a further detailed description of the embodiments of the present invention, the directional terms used in the embodiments of the present invention, such as "upper part", "lower part" and "side part", are not intended to limit the scope of protection of the present invention.

[0042] To make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] Figure 1 This is a schematic diagram of the structure of a lifting and removing device according to an embodiment of the present invention; Figure 2 for Figure 1 The front view of the illustrated embodiment.

[0045] like Figure 1 and Figure 2 As shown, one embodiment of the present invention provides a pull-out device 100 for pulling out a valve leakage ring 220. The pull-out device 100 includes a support structure 110 and a pull-out structure 120, wherein:

[0046] The support structure 110 is sleeved on the valve stem 240, and the support structure 110 abuts against the yoke 230, forming an operating space between the support structure 110 and the yoke 230.

[0047] The lifting structure 120 is disposed in the operating space. The lifting structure 120 includes a rotating part and a lifting part. The rotating part is rotatably connected to the support structure 110. The rotating part is sleeved on the valve stem 240. One end of the lifting part is disposed on the side of the rotating part facing the yoke 230. The other end of the lifting part is connected to the valve leakage ring 220. The lifting part does not rotate with the rotating part.

[0048] The lifting and removing device 100 provided in this embodiment of the invention includes a support structure 110 and a lifting structure 120. The support structure 110 abuts against the yoke 230 and supports the rising and falling of the lifting structure 120. The lifting structure 120 includes a rotating part and a lifting part. The rotating part is rotatably connected to the support structure 110 and is sleeved on the valve stem 240. The lifting part does not rotate with the rotating part. One end of the lifting part is located on the side of the rotating part facing the yoke 230, and the other end of the lifting part is connected to the valve leakage ring 220. Rotating the rotating part drives the lifting part to rise, and then drives the lifting part to fall. The valve lead-in ring 220 is raised and pulled out, and then the lower packing 210 is removed, thus replacing the valve stem 240 seal. On the one hand, the structure of the lifting and removing device 100 is simpler and easier to operate, improving the replacement efficiency of the valve stem 240 seal. On the other hand, the valve lead-in ring 220 is not damaged and is removed as a whole, ensuring the integrity of its function. After replacing the lower packing 210, the original valve lead-in ring 220 can still be used without replacing it with a new one, reducing replacement costs.

[0049] In one feasible implementation, the rotating part is a lifting nut 121, and the lifting part includes a lifting sleeve 122 and a pull-out screw 123. The lifting nut 121 and the lifting sleeve 122 are sleeved on the valve stem. The lifting nut 121 is rotatably connected to the support structure 110. The first end of the plurality of pull-out screws 123 is connected to the lifting sleeve 122, and the second end of the pull-out screws 123 is connected to the valve leakage ring 220.

[0050] The rotating part is a lifting nut 121, and the lifting part includes a lifting sleeve 122 and a pulling screw 123. The lifting nut 121 and the lifting sleeve 122 are sleeved on the valve stem 240. The first ends of multiple pulling screws 123 are evenly arranged on the side of the lifting sleeve 122 away from the lifting nut 121. The pulling screws 123 are fixedly connected to the valve leakage ring 220. By rotating the lifting nut 121, the pulling force is transmitted to the valve leakage ring 220 through the lifting sleeve and the pulling screws 123 in sequence, and the valve leakage ring 220 is lifted out. Then the lower packing 210 is removed, realizing the replacement of the valve stem 240 seal. The structure of the lifting and removing device 100 is simpler, the operation is more convenient, and the replacement efficiency of the valve stem 240 seal is improved.

[0051] Specifically, the lifting structure 120 is installed in the operating space of the support structure 110. The two ends of the pull-out screw 123 are fixedly connected to the valve drain ring 220 and the lifting sleeve 122, respectively. The lifting sleeve 122 is connected to the lifting nut 121. At this time, the lifting nut 121 is relatively closer to the valve drain ring 220. Rotating the lifting nut 121 causes the lifting nut 121 to move upward, and the pulling force is transmitted to the valve drain ring 220 through the lifting sleeve 122 and the pull-out screw 123 in sequence. This causes the valve drain ring 220 to move upward, and the valve drain ring 220 is removed from the stuffing box, thus realizing the replacement of the valve stem 240 seal.

[0052] The valve drain ring 220 typically has two mounting holes on the side facing the lifting structure 120, with internal threads inside. Both ends of the pull-out screw 123 have external threads. The second end of the pull-out screw 123 is fixedly connected to the mounting hole on the valve drain ring 220 via the thread. After the first end of the pull-out screw 123 passes through the lifting sleeve 122, the pull-out screw 123 and the lifting sleeve 122 are fixedly connected by tightening the nut. Depending on the site conditions, the lifting sleeve 122 is leveled using the nut, making the force on the valve drain ring 220 more even and improving the pulling efficiency. It should be noted that when the valve drain ring 220 cannot be removed from the two mounting holes, the two mounting holes can be tapped to increase the connection length between the valve drain ring 220 and the pull screw 123, thereby increasing the pulling force. If the valve drain ring 220 still cannot be pulled out, a hole is drilled and tapped on the side of the valve drain ring 220 facing the lifting structure 120. The drilled hole is evenly distributed with the mounting hole to increase the extraction force of the valve drain ring 220.

[0053] Furthermore, the diameter of the pull screw 123 is 5mm, which matches the mounting hole on the valve leakage ring 220. Multiple pull screws 123 are evenly arranged on the circumference of the lifting sleeve 122. On the one hand, this can make the valve leakage ring 220 more evenly pulled, avoid the valve leakage ring 220, and improve the pulling and taking out efficiency.

[0054] Figure 3 A schematic diagram showing the connection between the lifting nut and the lifting looper according to an embodiment of the present invention is provided.

[0055] like Figure 3 As shown, a first hanging ring 1211 is provided on the outer periphery of the lifting nut 121. The axial cross section of the first hanging ring 1211 is "L" shaped. The diameter of the lifting sleeve is larger than the diameter of the lifting nut. A second hanging ring 1221 is provided on the side of the lifting sleeve 122 facing the lifting nut 121. The axial cross section of the second hanging ring 1221 is inverted "L" shaped. The first hanging ring and the second hanging ring are matched.

[0056] The lifting nut has an annular first hanging ring 1211 on its outer circumference. The axial cross-section of the first hanging ring 1211 is L-shaped, with the bent portion facing away from the center of the lifting nut 121. The lifting sleeve 122 has an annular second hanging ring 1221 on its side facing the lifting nut 121. The axial cross-section of the second hanging ring 1221 is inverted L-shaped, with the bent portion facing the center of the lifting sleeve 122. The diameter of the lifting sleeve 122 is larger than the diameter of the lifting nut 121, and the second hanging ring 1221 is located on the outer circumference of the lifting sleeve, thus creating a connection between the first hanging ring 1211 and the second hanging ring 1221. The position of ring 1221 is matched to enable the engagement of lifting nut 121 and lifting loop 122. This arrangement ensures that the lifting loop 122 remains stationary when the lifting nut 121 rotates. That is, the first "L"-shaped hanging ring 1211 rotates on the second inverted "L"-shaped hanging ring 1221, while the lifting loop 122 does not rotate with the lifting nut 121. This ensures the pulling and removal function of the pull screw 123. On the other hand, it also ensures that the lower surface of the lifting nut 121 is in contact with the upper surface of the lifting loop 122, thus ensuring the stability of the rotation of the lifting nut 121.

[0057] It should be noted that the first hanging ring 1211 is located on the side of the lifting nut 121 near the lifting loop 122, which facilitates the matching and engagement of the first hanging ring 1211 and the second hanging ring 1221.

[0058] In one feasible implementation, the lifting nut 121 includes a pair of split nuts, which form an annular structure, and the lifting loop 122 includes a pair of split loops, which form an annular structure.

[0059] The lifting nut 121 includes a pair of split nuts, which form a ring structure. The pair of split nuts are connected by a pin. Similarly, the pair of split loops are also connected by a pin. This design allows the lifting structure 120 to be installed after the support structure 110 is installed, without the need to disassemble the valve 200, making installation more convenient.

[0060] It should be noted that a pair of split nuts and a pair of split loops can also be connected by riveting. Any connection method that can achieve a two-half structure is acceptable and is a common means of mechanical connection. It will not be elaborated here. Among them, the split nut is half of the lifting nut 121 and the split loop is half of the lifting loop 122.

[0061] In one feasible implementation, a plurality of first operating holes are provided on the outer periphery of the lifting loop 122.

[0062] The lifting loop 122 has multiple first operating holes on its outer periphery. On the one hand, these holes reduce weight and the downward pulling force on the lifting nut 121, ensuring its stable rotation. On the other hand, the first operating holes facilitate the fixing of the first end of the pull-out screw 123 to the lifting loop 122. The first end of the pull-out screw 123 passes through the lower wall of the lifting loop 122, and the nut is installed through the first operating holes, allowing the operator to easily access the holes to tighten the nut, thus achieving a fixed connection between the pull-out screw 123 and the lifting loop 122.

[0063] It should be noted that the location and size of the first operating hole should be selected according to the actual situation.

[0064] In one feasible implementation, the support structure 110 includes:

[0065] The support ring plate 111 is sleeved on the valve stem 240. A threaded sleeve 112 is fixed on the side of the support ring plate 111 facing the yoke 230. The threaded sleeve 112 is sleeved on the valve stem 240, and the rotating part is rotatably connected to the threaded sleeve 112.

[0066] Support screws 113 are all set on support ring plate 111. The first end of support screw 113 is connected to support ring plate 111, and the second end of support screw 113 abuts against yoke 230. Support ring plate 111 and support screw 113 form an operating space. Support screw 113 is located on the outside of lifting part.

[0067] The support ring plate 111 and the threaded sleeve 112 are integrally formed.

[0068] It should be noted that the yoke 230 itself has some mounting holes, and the support screw 113 is set in the mounting holes. Usually, the size of the support screw 113 matches the mounting holes of the yoke 230 to avoid instability caused by excessive gap. The support ring plate 111 and the threaded sleeve 112 are integrally formed by turning, which can improve the support weight of the support structure 110, that is, improve the stability of the support structure 110 and ensure the stability of the lifting structure 120 when it is lifted upward.

[0069] The support ring plate 111 and the threaded sleeve 112 are two-half structures, which facilitates the installation of the support ring plate 111 and the threaded sleeve 112 on the valve stem 240. The number of support screws 113 is usually even, and they are evenly arranged below the support ring plate 111. This makes the force on the support ring plate 111 more uniform and improves the stability of the support structure 110.

[0070] Furthermore, the first end of the support screw 113 is detachably connected to the support ring plate 111 via a nut.

[0071] The first end of the support screw 113 passes through the support ring plate 111 and is then tightened with a nut. The nut connection not only achieves a fixed connection between the support screw 113 and the support ring plate 111, but also allows for leveling of the support structure 110. This ensures that the valve leakage ring 220 is subjected to more uniform force, preventing uneven force from causing the valve leakage ring 220 to become eccentric and difficult to remove.

[0072] In one possible implementation, the support structure 110 includes at least two support screws 113.

[0073] In this embodiment, four support screws 113 are used. It should be noted that four pull-out screws 123 are also used in this embodiment. The setting of an even number of pull-out screws 123 can reduce the pulling force of a single pull-out screw 123 and improve the service life of the pull-out screw 123. On the other hand, it can also ensure that the valve leakage ring 220 is subjected to more uniform force and avoid the situation that the valve leakage ring 220 is difficult to remove due to uneven force.

[0074] In one feasible implementation, a plurality of second operating holes are uniformly provided on the outer periphery of the rotating part, and the second operating holes are used to rotate the rotating part.

[0075] In this embodiment, the rotating part is the lifting nut 121, that is, the outer periphery of the lifting nut 121 is evenly provided with a plurality of second operating holes. The rod-shaped force-applying tool is placed in the second operating hole and a radial force is applied to the second operating hole to realize the rotation of the lifting nut 121 on the threaded sleeve 112, thereby realizing the lifting and removal of the valve leakage ring 220. The provision of multiple second operating holes makes it convenient for the operator to rotate the lifting nut 121 in one position without moving, making the operation more convenient.

[0076] It should be noted that the lifting and extraction device 100 in this embodiment is made of stainless steel. Stainless steel has good corrosion resistance, which can improve the service life of the lifting and extraction device 100. Stainless steel also has good physical properties (high temperature resistance), which can improve the applicability of the lifting and extraction device 100.

[0077] Furthermore, the pull-out device 100 of this application can be applied to any valve including the valve drain ring 220, and can pull out the valve drain ring 220 to replace the seal in the valve. The size of the pull-out device 100 can be adapted according to actual needs and dimensions.

[0078] Example 2

[0079] Figure 4 This is a flowchart illustrating the steps of installing and using a lifting and removing device according to an embodiment of the present invention.

[0080] like Figure 4 As shown, one embodiment of the present invention provides a method for installing and using a lifting and removing device, the method comprising the following steps:

[0081] Step 1: Preparations before installing the lifting and extraction device;

[0082] Step 2: Install multiple pull-out screws on the valve leakage ring;

[0083] Step 3: Depending on the site conditions, install the support ring plate and threaded sleeve on the valve stem, and also install the support screw.

[0084] Step 4: Install the lifting nut on the end of the threaded sleeve away from the support ring plate, and install the lifting loop on the end of the lifting nut away from the support ring plate;

[0085] Step 5: Securely connect the end of the multiple pull-out screws away from the valve leakage ring to the lifting loop;

[0086] Step 6: Level the lifting and extraction device;

[0087] Step 7: Rotate the lifting nut to move it towards the support ring plate on the threaded sleeve until the valve drain ring is pulled out and the lower packing is removed.

[0088] The preparatory work is to better install the lifting and extraction device 100 and ensure the stability of its operation. First, install two (multiple) extraction screws 123. Then, install the support ring plate 111 and threaded sleeve 112 at a suitable position on the valve stem 240. Simultaneously, install four (multiple) support screws 113 on the support ring plate 111. The support screws 113 are fixedly connected to the support ring plate 111 by nuts. The other end of the support screws 113 is directly inserted into the existing mounting holes on the yoke 230. After installing the support structure 110, an operating space is formed between the support screws 113 and the support ring plate 111. The lifting structure 120 is then placed within this operating space. Specifically, the lifting nut 121 is first installed on the threaded sleeve 112. At the bottom of 12, a lifting sleeve 122 is then hung at the lower end of the lifting nut 121. At this time, the extraction screw 123 is inserted into the lifting sleeve 122. The nut is tightened through the first operating hole on the lifting sleeve 122 to achieve a fixed connection between the extraction screw 123 and the lifting sleeve 122. The lifting and removal device 100 is leveled by the nut on the support screw 113 to make the force on the valve leakage ring 220 more even. Then, a rod-shaped force-applying tool is inserted into the second operating hole and the lifting nut 121 is rotated to move the lifting nut 121 upward on the threaded sleeve 112, thereby driving the lifting sleeve 122 and the extraction screw 123 upward in sequence, and then removing the valve leakage ring 220 from the stuffing box to replace the valve stem 240 seal.

[0089] When the lifting nut 121 rotates, the lifting loop 122 and the pull screw 123 only bear the vertical tension, not the torque and shear force. During operation, the support structure 110 is subjected to the downward tension of the lifting structure 120, which makes the support screw 113 more securely and stably placed in the mounting hole of the yoke 230, improving the safety of the entire lifting and extraction device 100. The upper ends of the support screw 113 and the pull screw 123 are fixed with nuts. During operation, the entire lifting and extraction device 100 can be leveled according to the actual situation of the yoke 230 to ensure that the valve leakage ring 220 is subjected to uniform force and will not get stuck in the annular space, thus improving the reliability of the lifting and extraction device 100.

[0090] The lifting and extraction device and its usage method are used for the maintenance of valve 200 in nuclear power plants. The lifting and extraction device 100 has a simple structure and operation, and its lifting and extraction performance is reliable. Under the premise of ensuring that no damage is caused to the valve stem 240 or the valve body, the valve drain ring 220 can be quickly and completely lifted out. After the lower packing 210 is replaced, the original valve drain ring 220 can continue to be used, reducing replacement costs.

[0091] In one feasible implementation, the preparation work includes:

[0092] First, remove the upper packing of the valve drain ring and clean the residue on the upper surface of the valve drain ring, the valve stem, and the inner wall of the stuffing box.

[0093] The cleaning of the valve leakage ring 220, as well as the cleaning of the valve stem 240 and the residue on the inner wall of the stuffing box, is to facilitate the installation of the lifting and extraction device 100, avoid jamming during installation, reduce installation efficiency, and thus affect the lifting and extraction efficiency.

[0094] It should be noted that when the mounting holes (two) on the valve drain ring 220 are typically short and have a small number of internal thread turns, if the valve drain ring 220 cannot be pulled out, the existing mounting holes on the valve drain ring 220 need to be deeply machined and tapped to increase the number of tapping turns. This improves the connection stability between the pull-out screw 123 and the valve drain ring 220, ensuring the working stability of the pull-out device 100. Furthermore, if the valve drain ring 220 still cannot be pulled out, a hole is drilled and tapped on the side of the valve drain ring 220 facing the pull-out structure 120. This hole is evenly distributed with the mounting holes to increase the extraction force on the valve drain ring 220.

[0095] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "a plurality" refers to two or more unless otherwise expressly defined.

[0096] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0097] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pulling-out device for pulling out a valve leakage ring, characterized in that, The lifting and pulling device comprises a supporting structure and a lifting structure, wherein: The supporting structure is sleeved on the valve stem, abuts against the yoke, and forms an operation space between the supporting structure and the yoke; The lifting structure is arranged in the operation space, and comprises a rotating part and a lifting part, the rotating part is rotationally connected with the supporting structure, the rotating part is sleeved on the valve stem, one end of the lifting part is arranged on the side of the rotating part facing the yoke, the other end of the lifting part is connected with the valve leakage ring, and the lifting part does not rotate with the rotating part; The rotating part is a lifting nut, the lifting part comprises a lifting sleeve and a pulling screw rod, the lifting nut and the lifting sleeve are sleeved on the valve stem, the lifting nut is rotationally connected with the supporting structure, the first ends of a plurality of the pulling screw rods are connected with the lifting sleeve, and the second ends of the pulling screw rods are connected with the valve leakage ring; The supporting structure comprises a supporting ring plate, which is sleeved on the valve stem, and a threaded sleeve fixed on the side of the supporting ring plate facing the yoke, the threaded sleeve is sleeved on the valve stem, and the rotating part is rotationally connected with the threaded sleeve.

2. The pull-out device according to claim 1, characterized in that A first hanging ring is arranged on the outer periphery of the lifting nut, the axial section of the first hanging ring is in the shape of "L", the diameter of the lifting sleeve is greater than that of the lifting nut, a second hanging ring is arranged on the side of the lifting sleeve facing the lifting nut, the axial section of the second hanging ring is in the shape of inverted "L", and the first hanging ring is matched with the second hanging ring.

3. The pull-out device according to claim 1, characterized in that The lifting nut comprises a pair of split nuts, and the pair of split nuts form an annular structure, the lifting sleeve comprises a pair of split sleeves, and the pair of split sleeves form an annular structure.

4. The pull-out device according to claim 1, characterized in that A plurality of first operation holes are arranged on the outer periphery of the lifting sleeve.

5. The pull-out device according to claim 1, characterized in that The supporting structure further comprises: Supporting screw rods, which are arranged on the supporting ring plate, the first ends of the supporting screw rods are connected with the supporting ring plate, the second ends of the supporting screw rods abut against the yoke, the supporting ring plate and the supporting screw rods form the operation space, and the supporting screw rods are located outside the lifting part. The supporting ring plate and the threaded sleeve are integrally formed.

6. The pull-out device according to claim 5, characterized in that The supporting structure comprises at least two supporting screw rods.

7. The pull-out device according to any one of claims 1 to 6, characterized in that A plurality of second operation holes are uniformly arranged on the outer periphery of the rotating part, and the second operation holes are used for rotating the rotating part.

8. A method of installing and using a puller device according to any one of claims 1 to 7, characterized in that, The supporting structure further comprises supporting screw rods, the first ends of the supporting screw rods are connected with the supporting ring plate, the second ends of the supporting screw rods abut against the yoke, and the installation and use method comprises the following steps: Preparation work before installation of the lifting and pulling device; A plurality of pulling screw rods are installed on the valve leakage ring; According to the site conditions, the supporting ring plate, the threaded sleeve, and the supporting screw rods are installed on the valve stem; The lifting nut is installed at the end of the threaded sleeve away from the supporting ring plate, and the lifting sleeve is installed at the end of the lifting nut away from the supporting ring plate; The ends of the plurality of pulling screw rods away from the valve leakage ring are fixedly connected with the lifting sleeve; The lifting and pulling device is leveled; Rotating the lifting nut to move the lifting nut on the threaded sleeve in the direction of the support ring plate until the valve leakage ring is pulled out and the lower packing is removed.

9. The method of installing and using a puller according to claim 8, wherein, The preparation work includes: First, remove the upper packing of the valve leakage ring, and clean the residues on the upper surface of the valve leakage ring, the valve stem and the inner wall of the packing box.

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