Ball valve component online disassembly and assembly device and method

Abstract

The present invention belongs to the field of valve technology and specifically discloses an online disassembly and assembly device and method for ball valve components, the ball valve comprising a valve body, a valve seat, a valve core and a retaining ring, the valve seat can be movably installed in the valve body along its own axis, the retaining ring is threadedly connected to the valve seat, and a driving tooth for receiving rotational power is circumferentially provided on the retaining ring; the disassembly and assembly device comprises a mounting seat and a driving assembly arranged on the mounting seat, the output end of the driving assembly has an output gear, which is used to mesh with the driving tooth to drive the valve seat to move axially relative to the valve core along the valve seat through the retaining ring, a limiting assembly, the limiting assembly is detachably connected to the valve body, the limiting assembly comprises a baffle, the baffle limits the axial movement of the retaining ring, the purpose of the present invention is to provide an online disassembly and assembly device and method for ball valve components, which is used to solve the problem in the prior art that manual operation is inconvenient, which easily leads to insufficient pre-tightening force between the valve seat and the valve core and leakage.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to an online disassembly and assembly device and method for ball valve components. Background Art

[0002] Ultra-low temperature ball valves are mainly used in low-temperature working conditions of liquefied natural gas (LNG) receiving stations, LNG storage tanks and transportation, air separation units, cryogenic methanol, liquid oxygen, liquid nitrogen and other cryogenic storage tanks and tank trucks. As the medium changes from liquid to gas with temperature, the volume expands rapidly and the pressure increases. At the same time, the medium is often flammable and explosive. At the request of users, the ball valve structure currently used more frequently in ultra-low temperature devices is the top-entry structure.

[0003] At the same time, there is currently no better method for pre-tightening the assembly of ultra-low temperature top-mounted ball valves with large diameter and high pressure. The main difficulty lies in the limited human power and limited installation space. It is easy for the pre-tightening force between the valve seat and the valve core to be insufficient during assembly, resulting in leakage. When assembling the valve seat and valve core in the ball valve, the ball valve needs to be shut down as a whole, transferred, and then assembled. However, due to the large overall size of the ball valve, the shutdown and transfer process will waste a lot of manpower and material resources, as well as the time cost wasted due to long-term shutdown. In view of this, the inventor has proposed an online disassembly and assembly device and method for ball valve components. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an online disassembly and assembly device and method for ball valve components, which is used to solve the problem in the prior art that large-diameter, low-temperature, top-loading ball valves need to be shut down and transferred when assembling valve internal components, thereby wasting a lot of manpower and material resources and resulting in excessive downtime.

[0005] To achieve the above-mentioned and other related objectives, the present invention provides an online disassembly and assembly device for ball valve components, wherein the ball valve comprises a valve body, a valve seat, a valve core, and a retaining ring. The valve seat is movably mounted within the valve body along its own axis, and the retaining ring is threadedly connected to the valve seat. The device is characterized in that: a driving tooth for receiving a rotational power is circumferentially provided on the retaining ring, and a limiting rod is provided on the valve body, wherein the limiting rod limits the rotation of the valve seat.

[0006] The disassembly and assembly device includes a mounting seat and a drive assembly disposed on the mounting seat. The output end of the drive assembly has an output gear, which is used to engage with the drive teeth. When the output gear rotates, the drive teeth drive the retaining ring to rotate and move axially. The rotation of the retaining ring drives the valve seat to move axially relative to the valve core along the valve seat.

[0007] A limit assembly is detachably connected to the valve body, and the limit assembly includes a baffle, which limits the axial movement of the retaining ring.

[0008] Optionally, the limit assembly also includes a mounting plate, the baffle is welded to the mounting plate, the mounting plate is detachably connected to the valve body, an adaptation groove is provided on the baffle, the curvature of the adaptation groove is the same as the curvature of the retaining ring, and a plurality of rolling bearings that can contact the side wall of the retaining ring are circumferentially provided on the side wall of the baffle.

[0009] Optionally, the drive assembly includes a matching worm wheel and a worm, the worm is used to connect with the power mechanism, and the worm wheel is connected to the output gear in a transmission manner.

[0010] Optionally, the driving assembly further includes an intermediate gear, the intermediate gear is connected to the worm gear via a transmission shaft and rotates synchronously, and the intermediate gear is meshed with the output gear.

[0011] Optionally, the power mechanism includes a connecting rod and a handwheel, a coupling is provided at the end of the worm, the connecting rod is connected to the free end of the coupling, and the handwheel is arranged at the free end of the connecting rod.

[0012] Optionally, the mounting seat includes a connecting plate, a worm gear box and a gear box, the connecting plate is detachably connected to the valve body, the worm gear box is detachably connected to the connecting plate, and the gear box is detachably connected to the worm gear box.

[0013] Optionally, the gear box is provided with a plurality of positioning pins, the gear box is provided with a plurality of fixing screws threadedly connected to the worm gear box, the gear box is provided with a mounting groove, the output gear is arranged in the mounting groove, and a part of the output gear extends out of the mounting groove and engages with the driving tooth.

[0014] Optionally, the connecting plate is detachably connected to a plurality of positioning studs threadedly connected to the valve body, the positioning studs are threadedly connected to positioning nuts, and the connecting plate is provided with a plurality of fixing screws threadedly connected to the worm gear box.

[0015] Optionally, the transmission shaft is rotatably connected to the worm gear box, the transmission shaft is keyed to the worm gear, a shaft sleeve is sleeved on the transmission shaft, a first bearing is sleeved on the transmission shaft, and the worm gear box is provided with a first fixed end cover for mounting the first bearing;

[0016] A gear shaft is rotatably connected in the gear box, the gear shaft is key-connected to the output gear, a second bearing is sleeved on the gear shaft, and a second fixed end cover for mounting the second bearing is provided on the gear box.

[0017] The present invention also provides a method for online disassembly and assembly of a ball valve component, which uses the above-mentioned online disassembly and assembly device of the ball valve component, comprising the following steps:

[0018] Use the lifting device to hoist the mounting seat to the upper surface of the valve body, and install the limit assembly at the same time to ensure that the output gear and the retaining ring are engaged with each other;

[0019] Turn the handwheel, the retaining ring moves toward the valve core until it fits into the limit assembly and is limited. The handwheel continues to turn, and the thread moves the valve seat away from the valve core to the limit position;

[0020] Remove the disassembly device and the limit assembly and install them to another valve seat position. Repeat the above steps. There will be space between the valve seats to remove the valve core, so that the valve core can be lifted and removed.

[0021] Then rotate the handle in the opposite direction, the retaining ring moves toward the flow channel at both ends, the retaining ring hits the valve body and is limited, and the valve seat moves in the opposite direction and moves out of the matching position of the thread pair, and the valve seat can be lifted out;

[0022] When installing the valve seat, follow the above steps in reverse order. First, lift the valve seat into the valve body, turn the handwheel to drive the retaining ring to rotate, and the retaining ring drives the valve seat to move axially until it moves to the limit position in the valve body, so that there is space for installing the valve core.

[0023] Lift the valve core between the valve seats and rotate the handwheel in the opposite direction. When the retaining ring is limited by the valve body, the valve seat moves toward the valve core, completing the online pre-tightening assembly.

[0024] As described above, the device and method for online disassembly and assembly of ball valve components of the present invention have the following beneficial effects:

[0025] (1) The present invention uses gears to drive the retaining ring to move, and there is no need for manual force to be applied directly to the retaining ring to drive the retaining ring to rotate, thereby preventing the valve core from being damaged when the wrench is repeatedly extracted. At the same time, the device can be installed on the valve body to perform online installation and removal of the valve seat and valve core, without the need to shut down for a long time and then remove the ball valve to disassemble and install the valve seat and valve core, thereby shortening the downtime and reducing maintenance costs.

[0026] (2) The present invention adopts a gear train transmission, which can output torque with a large transmission ratio and is suitable for the installation and disassembly of medium and large-caliber top-mounted ball valves. When workers install, the power mechanism can drive the drive assembly to move, and finally the output gear drives the retaining ring to rotate to control the axial movement of the valve seat, so that the required preload force is achieved between the valve seat and the valve core. The output torque can be increased through the transmission connection, which enhances the sealing effect between the valve seat and the valve core and prevents the ball valve from leaking due to insufficient preload force inside the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Shown is a schematic diagram of the structure after installation of an embodiment of the present invention;

[0028] Figure 2 Shown is a schematic diagram of the internal structure of an embodiment of the present invention after installation;

[0029] Figure 3 Shown is a cross-sectional view of an embodiment of the present invention after installation;

[0030] Figure 4 Shown is a first cross-sectional view of an embodiment of the present invention;

[0031] Figure 5 Shown is a second cross-sectional view of an embodiment of the present invention;

[0032] Figure 6 Shown is a schematic structural diagram of a position limiting assembly according to an embodiment of the present invention;

[0033] Figure 7 Shown is a schematic diagram of the prior art;

[0034] Figure 8 Shown is a schematic diagram of a wrench and a retaining ring in the prior art.

[0035] Description of Reference Numerals

[0036] Ball valve 1, valve body 101, valve seat 102, valve core 103, retaining ring 104, drive tooth 1041, actuator 2, connecting plate 201, worm gear box 202, worm 203, coupling 204, connecting rod 205, handwheel 206, worm gear 207, transmission shaft 208, intermediate gear 209, gear box 210, gear shaft 211, output gear 212, limit assembly 3, mounting plate 301, baffle 302, adapter groove 303, reinforcing rib 304, rolling bearing 305, positioning stud 4, positioning nut 5, wrench 6. DETAILED DESCRIPTION

[0037] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] It should be noted that the diagrams provided in the present embodiment are only schematic illustrations of the basic concept of the present invention. The diagrams only show the components related to the present invention and are not drawn according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during actual implementation can be changed at will, and the component layout type may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the present invention without substantially changing the technical content.

[0039] Before describing the embodiments of the present invention, the use background of the present invention is explained. The present invention is applied to a large-caliber, high-pressure ultra-low-temperature top-loading ball valve 1. The valve seat 102 and the valve core 103 inside the ball valve 1 need to achieve a pre-tightening force when assembled, and the valve seat 102 is adjusted by a retaining ring 104. A threaded pair is provided between the retaining ring 104 and the valve seat 102. The rotation of the retaining ring 104 can drive the valve seat 102 to move axially to achieve the pre-tightening force between the valve seat 102 and the valve core 103, so that a sealing pair is formed between the valve seat 102 and the valve core 103 to prevent the ball valve 1 from leaking. In the prior art, a wrench 6 is used to drive the retaining ring 104 to rotate, and a pin shaft on the side wall of the wrench 6 is inserted into the hole opened on the side wall of the retaining ring 104, rotated once, pulled out and then turned, and the above operation is repeated to drive the retaining ring 104 to move, thereby realizing the axial movement of the valve seat 102.

[0040] like Figures 1 to 8 As described above, the present invention provides an online disassembly and assembly device and method for ball valve components.

[0041] In an exemplary embodiment, a device for online disassembly and assembly of ball valve components is provided. The ball valve 1 includes a valve body 101, a valve seat 102, a valve core 103, and a retaining ring 104. The valve seat 102 is movably mounted within the valve body 101 along its own axis. The retaining ring 104 is threadedly connected to the valve seat 102. The device is characterized in that: a driving tooth 1041 for receiving a rotational power is provided circumferentially on the retaining ring 104. A limiting rod is provided on the valve body 101 to limit the rotation of the valve seat 102.

[0042] The disassembly and assembly device includes a mounting seat and a drive assembly disposed on the mounting seat. The output end of the drive assembly has an output gear 212, which is used to engage with the drive teeth 1041. When the output gear 212 rotates, the drive teeth 1041 drive the retaining ring 104 to rotate and move axially. The rotation of the retaining ring 104 drives the valve seat 102 to move axially relative to the valve core 103 along the valve seat 102.

[0043] The limiting assembly 3 is detachably connected to the valve body 101 . The limiting assembly 3 includes a baffle 302 . The baffle 302 limits the axial movement of the retaining ring 104 .

[0044] In this embodiment, by providing driving teeth 1041 on the side wall of the retaining ring 104 in the prior art, the retaining ring 104, which originally has a smooth outer wall, becomes a gear, and then the power mechanism is provided to drive the driving assembly to move, and the driving assembly synchronously drives the output gear 212 to rotate, and the output gear 212 is engaged with the driving teeth 1041 of the retaining ring 104, thereby driving the retaining ring 104 to move, and then realizing the axial movement of the valve seat 102. At the same time, the limit rod is provided in the inner cavity of the flow channel of the valve body 101, mainly to prevent the valve seat 102 from rotating with the retaining ring 104 when the retaining ring 104 rotates, thereby limiting the valve seat 102 to only axial movement.

[0045] The present invention also has a plurality of gears, and the plurality of gears are connected to the plurality of gears, and the plurality of gears are connected to the plurality of gears. The plurality of gears are connected to the plurality of gears, and the plurality of gears are connected to the plurality of gears.

[0046] In an exemplary embodiment, when the output gear 212 rotates and drives the retaining ring 104 to rotate, the retaining ring 104 moves along its own axial direction, and the retaining ring 104 is limited by the valve body 101 or the baffle 302 and no longer moves. The output gear 212 continues to rotate, and the valve seat 102 moves axially. The meshing width of the output gear 212 and the driving tooth 1041 is greater than the maximum distance of the axial movement of the retaining ring 104.

[0047] In this embodiment, the movement of the valve seat 102 can only be carried out after the retaining ring 104 is limited by the valve body 101 or the baffle 302, and the retaining ring 104 cannot be separated from the engagement with the output gear 212. Therefore, the engagement width between the output gear 212 and the driving tooth 1041 is greater than the maximum axial movement distance of the retaining ring 104, preventing the retaining ring 104 from falling off from the output gear 212, causing the problem of being unable to adjust the position of the retaining ring 104.

[0048] In an exemplary embodiment, the limiting assembly 3 also includes a mounting plate 301, a baffle 302 is welded to the mounting plate 301, an adapting groove 303 is opened on the baffle 302, the curvature of the adapting groove 303 is the same as the curvature of the retaining ring 104, and a plurality of rolling bearings 305 are circumferentially provided on the side wall of the baffle 302.

[0049] In this embodiment, the mounting plate 301 is provided so that the limit assembly 3 can be installed on the valve body 101. At the same time, the baffle 302 can limit the movement of the retaining ring 104 to prevent its axial movement from being too large and colliding with the valve core 103, causing damage to the valve core 103. The multiple rolling bearings 305 provided can rotate relative to the baffle 302 during the rotation of the retaining ring 104. The rolling bearings 305 can contact the side wall of the retaining ring 104, so that the planar friction generated by the relative movement of the two is converted into rolling friction, making the rotation of the retaining ring 104 more labor-saving, while avoiding damage to the retaining ring 104, and also preventing the retaining ring 104 from falling off and causing damage to the valve core 103.

[0050] Exemplarily, the baffle 302 is welded to the mounting plate 301 , and a reinforcing rib 304 is welded between the baffle 302 and the mounting plate 301 to increase the strength of the baffle 302 . Meanwhile, the rolling bearing 305 is mounted on the side wall of the baffle 302 via an axle pin.

[0051] It is worth noting that in this embodiment, the curvature of the adapting groove 303 is the same as that of the retaining ring 104, ensuring that the rolling bearing 305 is in contact with the side wall of the retaining ring 104. At the same time, the rolling bearings 305 are evenly arranged on the side wall of the baffle 302 in the circumferential direction, and the number is five.

[0052] In an exemplary embodiment, the drive assembly includes a worm wheel 207 and a worm 203 that cooperate with each other. The worm 203 is used to connect with the power mechanism, and the worm wheel 207 is in driving connection with the output gear 212.

[0053] In this embodiment, the worm 203 is used to drive the worm wheel 207 to rotate. When power is input to the power mechanism, the worm 203 rotates, and finally the worm wheel 207 is driven to rotate by the worm 203 .

[0054] In an exemplary embodiment, the driving assembly further includes an intermediate gear 209 . The intermediate gear 209 is connected to the worm gear 207 via a transmission shaft 208 and rotates synchronously. The intermediate gear 209 is meshed with the output gear 212 .

[0055] In this embodiment, the intermediate gear 209 is configured to rotate under the drive of the worm gear 207, and the intermediate gear 209 is engaged with the output gear 212, thereby driving the output gear 212 to rotate, and finally realizing the rotation of the retaining ring 104, thereby driving the valve seat 102 to move axially to form a seal with the valve core 103, thereby achieving the required preload force.

[0056] For example, for example, the intermediate gear 209 and the transmission shaft 208 are connected by a key, specifically a C-shaped flat key is used to connect to the intermediate gear 209, and a fixing nut is provided at the end of the transmission shaft 208 for fixing the intermediate gear 209, and a gasket is provided between the fixing nut and the intermediate gear 209.

[0057] It is worth noting that in this embodiment, the rotation of the worm gear 207 drives the rotation of the intermediate gear 209, and finally drives the rotation of the output gear 212. Through the gear train transmission of the intermediate gear 209 and the output gear 212, the small torque input manually can be transferred to a large torque, which facilitates the movement of the large-sized retaining ring 104 and prevents the problem of insufficient pre-tightening force and poor sealing effect caused by manual direct force applied to the retaining ring 104 due to restrictions such as installation position restrictions or torque input restrictions.

[0058] In an exemplary embodiment, the power mechanism includes a connecting rod 205 and a handwheel 206 . A coupling 204 is provided at the end of the worm 203 . The connecting rod 205 is connected to the free end of the coupling 204 . The handwheel 206 is provided at the free end of the connecting rod 205 .

[0059] In this embodiment, the worm 203 is used to drive the turbine to rotate. When the hand wheel 206 is manually turned, the hand wheel 206 can drive the connecting rod 205, the coupling 204 and the worm 203 to rotate synchronously, and finally drive the turbine to rotate through the worm 203.

[0060] For example, in this embodiment, the coupling 204 arranged between the connecting rod 205 and the worm 203 can strengthen the connection between the connecting rod 205 and the worm 203, and in this embodiment, the connection between the coupling 204 and the connecting rod 205 and the worm 203 is connected by a C-type flat key, and the coupling 204 is connected to the connecting rod 205 and the worm 203 using a set screw.

[0061] It is worth noting that in this embodiment, the role of the connecting rod 205 is to increase the effective length of the handwheel 206 to facilitate the operation of workers. It should also be noted that in this embodiment, the left and right side walls of the turbine box are installed with screw end covers, and the screw end covers are connected to the turbine box by screws, wherein the right end of the worm 203 passes through the screw short rod installed on the right side of the turbine box and is connected to the coupling 204, and two fixed bearings are provided on the worm 203 to facilitate the rotation of the worm 203.

[0062] In an exemplary embodiment, the mounting base includes a connecting plate 201 , a worm gear box 202 and a gear box 210 . The connecting plate 201 is detachably connected to the valve body 101 , the worm gear box 202 is detachably connected to the connecting plate 201 , and the gear box 210 is detachably connected to the worm gear box 202 .

[0063] In this embodiment, the mounting base includes three parts, wherein the connecting plate 201 is connected to the valve body 101 for fixing the turbine box. At the same time, the gear box 210 is installed on the front side wall of the turbine box to facilitate the installation of the driving wheel in the gear box 210 and connect it to the transmission shaft 208.

[0064] Illustratively, in this embodiment, a plurality of positioning pins are provided between the gear box 210 and the turbine box, and the gear box 210 and the turbine box are positioned by the positioning pins. At the same time, the gear box 210 and the turbine box are connected by fixing screws.

[0065] It is worth noting that a mounting groove is provided in the gear box 210 , and the output gear 212 is disposed in the mounting groove. The bottom of the output gear 212 passes through the mounting groove and engages with the driving teeth 1041 of the retaining ring 104 to drive the retaining ring 104 to rotate.

[0066] In an exemplary embodiment, the connecting plate 201 is detachably connected to a plurality of positioning studs 4 threadedly connected to the valve body 101 , the positioning studs 4 are threadedly connected to positioning nuts 5 , and the connecting plate 201 is provided with a plurality of fixing screws threadedly connected to the worm gear box 202 .

[0067] In this embodiment, the positioning studs 4 and the positioning nuts 5 are provided to connect the connecting plate 201 and the valve body 101 so that the connecting plate 201 is fixed on the valve body 101, and then the turbine box is installed on the connecting plate 201 by fixing screws.

[0068] It is worth noting that the mounting plate 301 in the limiting assembly 3 is also connected to the valve body 101 by using the positioning studs 4 and the positioning nuts 5 .

[0069] In an exemplary embodiment, the transmission shaft 208 is rotatably connected to the worm gear box 202, the transmission shaft 208 is keyed to the worm gear 207, a shaft sleeve is sleeved on the transmission shaft 208, a first bearing is sleeved on the transmission shaft 208, and a first fixed end cover for mounting the first bearing is provided on the worm gear box 202;

[0070] A gear shaft 211 is rotatably connected in the gear box 210 , and the gear shaft 211 is key-connected to the output gear 212 . A second bearing is sleeved on the gear shaft 211 , and a second fixed end cover for mounting the second bearing is provided on the gear box 210 .

[0071] In this embodiment, the transmission shaft 208 is connected to the turbine key, and the turbine can drive the transmission shaft 208 to rotate, thereby driving the intermediate gear 209 to rotate. At the same time, the transmission shaft 208 is provided with a shaft sleeve and a first bearing to enhance the stability of the rotation of the transmission shaft 208, and a first fixed end cover is provided to fix the first bearing.

[0072] In this embodiment, the output gear 212 is fixed by the gear shaft 211, and a second bearing is provided to provide stability for the rotation of the output gear 212. There are two second bearings, and the second fixed end cover is used to fix the second bearing.

[0073] Exemplarily, there are two first bearings and two first fixed end covers, which are symmetrically arranged on the front and rear side walls of the turbine housing, wherein the transmission shaft 208 passes through the first fixed end cover of the front side wall and is connected to the intermediate gear 209.

[0074] It is worth noting that, in the present invention, the fixed bearing, the first bearing and the second bearing are all tapered roller bearings, the difference being in the type and size.

[0075] The present invention also provides a method for online disassembly and assembly of ball valve components, which includes the following implementation steps:

[0076] Example 1: When used for online assembly of the valve core 103:

[0077] The assembly consisting of the valve seat 102 and other valve internal parts is hoisted into the valve body 101, and the valve seat 102 is pulled from the flow channel to the valve seat 102 holes on both sides of the valve body 101 to make room for the inner cavity of the valve body 101, and the valve core 103 is hoisted into the inner cavity of the valve body 101. At this time, the two devices of the present invention are hoisted to the upper end surface of the valve body 101 to ensure that the output gear 212 and the drive gear 1041 are engaged with each other, and the connecting plate 201 is fixed with the positioning stud 4 and the positioning nut 5 in the valve accessories. At this time, the handwheels 206 of the two devices are rotated at the same time. The device of the present invention transmits torque to the retaining ring 104. Since the retaining ring 104 and the valve seat 102 are threaded together, the retaining ring 104 moves outward until it is attached to the valve body 101, and the valve seat 102 moves toward the valve core 103 until it is completely fitted with the valve core 103 and the preload force requirement is met.

[0078] Example 2: For online disassembly of the valve seat 102:

[0079] The lifting and disassembly device is installed on the upper end surface of the valve body 101 to ensure that the output gear 212 and the retaining ring 104 are engaged with each other. The hand wheel 206 is rotated in the opposite direction of assembly, and the retaining ring 104 moves toward the valve core 103 until it is in contact with the limit assembly 3 and is limited. The hand wheel 206 continues to rotate, and the thread causes the valve seat 102 to move to the extreme position away from the valve core 103. The device of the present invention and the limit assembly 3 are removed and installed at another valve seat 102 position. The above steps are repeated, and there is space between the valve seats 102 to remove the valve core 103. After lifting and removing the valve core 103, the handle is rotated in the opposite direction, and the retaining ring 104 moves in the direction of the flow channel at both ends. The retaining ring 104 hits the valve body 101 and is limited. The valve seat 102 then moves in the opposite direction and moves out of the matching position of the thread pair. The valve seat 102 can then be lifted out, thereby disassembling the valve seat 102.

[0080] Example 3: When used for online assembly of the valve seat 102:

[0081] After the valve seat 102 is fully inserted into the valve body 101, the retaining ring 104 is rotated to move it toward the flow channel of the valve body 101. At this time, the disassembly device and the limit assembly 3 are installed on the upper end face of the valve body 101. It is necessary to ensure that the output gear 212 and the retaining ring 104 are engaged with each other, and then the positioning stud 4 and the positioning nut 5 in the valve accessories are used to fix the connecting plate 201. Turn the handwheel 206, and the retaining ring 104 moves toward the limit assembly 3 until it fits with the limit assembly 3. Continuously turn the handwheel 206, and the threaded pair drives the valve seat 102 to move toward the flow channel hole of the valve body 101 until the valve seat 102 completely enters the valve body 101, and then remove the limit assembly 3. Repeat the above operation with the disassembly and assembly device to install another valve seat 102, which will leave space for installing the valve core 103. Lift the valve core 103 into the valve body 101, and simultaneously turn the handwheels 206 of the two devices to move the retaining ring 104 until it fits the valve body 101. The valve seat 102 will move toward the valve core 103 until it is completely in contact with the valve core 103 and the pre-tightening requirement is met.

[0082] To sum up, in the present invention, a gear train transmission is adopted, the output gear 212 is engaged with the retaining ring 104, the output gear 212 is driven to rotate by the power mechanism, and the retaining ring is limited by the limiting component 3, so that the valve core 103 and the valve seat 102 can be finally installed and disassembled online. There is no need to remove the ball valve as a whole to assemble the valve seat 102 and the valve core 103 separately, which shortens the downtime, reduces the maintenance cost, does not require a lot of manpower and material resources, and increases the efficiency of the enterprise.

[0083] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. An online disassembly and assembly device for a ball valve component, the ball valve comprising a valve body, a valve seat, a valve core, and a retaining ring. The valve seat is movably mounted within the valve body along its own axis, and the retaining ring is threadedly connected to the valve seat. The device is characterized in that: The retaining ring is provided with driving teeth for receiving rotational power along the circumference, and the valve body is provided with a limit rod, which limits the rotation of the valve seat; The disassembly and assembly device includes a mounting seat and a drive assembly disposed on the mounting seat. The output end of the drive assembly has an output gear, which is used to engage with the drive teeth. When the output gear rotates, the drive teeth drive the retaining ring to rotate and move axially. The rotation of the retaining ring drives the valve seat to move axially relative to the valve core along the valve seat. A limit assembly, the limit assembly being detachably connected to the valve body, the limit assembly comprising a baffle, the baffle limiting the axial movement of the retaining ring; The limit assembly also includes a mounting plate, the baffle is welded to the mounting plate, the mounting plate is detachably connected to the valve body, an adaptation groove is provided on the baffle, the curvature of the adaptation groove is the same as the curvature of the retaining ring, and a plurality of rolling bearings that can contact the side wall of the retaining ring are circumferentially provided on the side wall of the baffle.

2. The ball valve component online disassembly and assembly device according to claim 1, characterized in that: The driving assembly includes a worm wheel and a worm that match each other. The worm is used to connect with the power mechanism, and the worm wheel is in driving connection with the output gear.

3. The ball valve component online disassembly and assembly device according to claim 2, characterized in that: The driving assembly further includes an intermediate gear, which is connected to the worm gear via a transmission shaft and rotates synchronously, and the intermediate gear is meshed with the output gear.

4. The ball valve component online disassembly and assembly device according to claim 3, characterized in that: The power mechanism includes a connecting rod and a hand wheel. A coupling is provided at the end of the worm. The connecting rod is connected to the free end of the coupling. The hand wheel is arranged at the free end of the connecting rod.

5. The ball valve component online disassembly and assembly device according to claim 3, characterized in that: The mounting seat includes a connecting plate, a worm gear box and a gear box. The connecting plate is detachably connected to the valve body, the worm gear box is detachably connected to the connecting plate, and the gear box is detachably connected to the worm gear box.

6. The ball valve component online disassembly and assembly device according to claim 5, characterized in that: The gear box is provided with a plurality of positioning pins, the gear box is provided with a plurality of fixing screws threadedly connected to the worm gear box, the gear box is provided with a mounting groove, the output gear is arranged in the mounting groove, and a part of the output gear extends out of the mounting groove and engages with the driving tooth.

7. The ball valve component online disassembly and assembly device according to claim 6, characterized in that: The connecting plate is detachably connected with a plurality of positioning studs threadedly connected to the valve body, the positioning studs are threadedly connected with positioning nuts, and the connecting plate is provided with a plurality of fixing screws threadedly connected to the worm gear box.

8. The ball valve component online disassembly and assembly device according to claim 5, characterized in that: The transmission shaft is rotatably connected to the worm gear box, the transmission shaft is keyed to the worm gear, a shaft sleeve is sleeved on the transmission shaft, a first bearing is sleeved on the transmission shaft, and a first fixed end cover for mounting the first bearing is provided on the worm gear box; A gear shaft is rotatably connected in the gear box, the gear shaft is key-connected to the output gear, a second bearing is sleeved on the gear shaft, and a second fixed end cover for mounting the second bearing is provided on the gear box.

9. A method for online disassembly and assembly of a ball valve component, using the online disassembly and assembly device of a ball valve component according to any one of claims 1 to 8, characterized in that: The following steps are involved: Use the lifting device to hoist the mounting seat to the upper surface of the valve body, and install the limit assembly at the same time to ensure that the output gear and the retaining ring are engaged with each other; Turn the handwheel, the retaining ring moves toward the valve core until it fits into the limit assembly and is limited. The handwheel continues to turn, and the thread moves the valve seat away from the valve core to the limit position; Remove the disassembly device and the limit assembly and install them to another valve seat position. Repeat the above steps. There will be space between the valve seats to remove the valve core, so that the valve core can be lifted and removed. Then rotate the handle in the opposite direction, the retaining ring moves toward the flow channel at both ends, the retaining ring hits the valve body and is limited, and the valve seat moves in the opposite direction and moves out of the matching position of the thread pair, and the valve seat can be lifted out; When installing the valve seat, follow the above steps in reverse order. First, lift the valve seat into the valve body, turn the handwheel to drive the retaining ring to rotate, and the retaining ring drives the valve seat to move axially until it moves to the limit position in the valve body, so that there is space for installing the valve core. Lift the valve core between the valve seats and rotate the handwheel in the opposite direction. When the retaining ring is limited by the valve body, the valve seat moves toward the valve core, completing the online pre-tightening assembly.

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