Conical surface self-centering tool for disassembly and assembly of fixed type hard sealing three-way ball valve

Abstract

The invention discloses a conical surface self-centering tool for disassembly and assembly of a fixed type hard sealing three-way ball valve, and relates to the field of disassembly and assembly tools of fixed type hard sealing three-way ball valves. A traditional assembly and disassembly tool for a fixed type hard sealing three-way ball valve mostly depends on manual positioning and knocking adjustment, so that the positioning deviation is large, and the assembly efficiency is low. The device comprises a three-petal type fixing plate, a positioning conical surface body, a radial guide plate, a bearing threaded sleeve, a dynamic bolt, an adjusting nut, a heavy frame, a guide sleeve, a connecting bolt, a flat washer and an elastic piece. According to the whole tool, efficient self-centering, reliable tensioning, precise traction and convenient disassembly and assembly are achieved through structure integration, the precision and efficiency of ball valve assembly are greatly improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The invention relates to the field of disassembly and assembly tools for fixed hard-sealed three-way ball valves, and in particular to a conical surface self-centering tool for disassembly and assembly of fixed hard-sealed three-way ball valves. Background Art

[0002] Conventional tooling for the assembly and disassembly of fixed, hard-seal three-way ball valves faces numerous technical challenges in practical application. Traditional tooling relies heavily on manual positioning and tapping adjustments, such as using gaskets to compensate for dimensional errors and manually centering the valve seat bore. This results in significant positioning deviations and low assembly efficiency, making single-station assembly time-consuming and difficult to meet high-precision requirements. Furthermore, traditional processes often rely on hydraulic or pneumatic equipment for power, which not only consumes a lot of energy but also requires extensive manual labor. Long-term work can easily lead to fatigue and injuries. Furthermore, the non-modular design complicates the replacement of wearing parts, resulting in high maintenance costs. Furthermore, conventional tooling lacks adaptability to valve seats of varying apertures, making tool replacement time-consuming and labor-intensive. In vibrating environments, the valve seat can easily loosen due to tension loss, and even damage the seat bore due to excessive force, resulting in high scrap rates. Some existing self-centering or tensioning tooling cannot simultaneously meet the requirements of high-precision positioning, adaptive tensioning, and low-energy operation. Structural innovation is urgently needed to address these issues. Summary of the Invention

[0003] The technical problem to be solved and the technical task to be addressed by this invention are to improve and enhance existing technical solutions by providing a conical self-centering tool for the assembly and disassembly of a fixed hard-sealed three-way ball valve, with the goal of achieving efficient and high-precision assembly and disassembly of the fixed hard-sealed three-way ball valve. To this end, this invention adopts the following technical solution.

[0004] A conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve, comprising a three-petal fixed plate, a positioning conical body, a radial guide plate, a receiving threaded sleeve, a dynamic bolt, an adjusting nut and a load-bearing frame, wherein the positioning conical body comprises a positioning conical body portion of a truncated cone structure and a columnar threaded connection portion located above the positioning conical body portion, the outer periphery of the positioning conical body portion and the inner hole of the three-petal fixed plate are matched through a conical surface, the radial guide plate is arranged above the three-petal fixed plate, the receiving threaded sleeve is arranged above the radial guide plate, the threaded connection portion passes upward through the inner hole of the three-petal fixed plate and the radial guide After the inner hole of the plate is screwed into the internal threaded hole of the receiving threaded sleeve, the radial guide plate and the three-petal fixed plate are connected by a radial guide connection structure and an elastic member, so that when the positioning cone body is lifted or lowered, the three-petal fixed plate performs corresponding radial expansion and contraction and maintains elastic dynamic tension. The outer periphery of the three-petal fixed plate is provided with an annular flange, and the annular flange matches the annular groove provided in the center hole of the valve seat of the fixed hard-sealed three-way ball valve. After the dynamic bolt passes through the bearing frame from top to bottom, its lower end is screwed into the internal threaded hole from the upper end of the receiving threaded sleeve. The adjusting nut is provided at the upper end of the bearing frame and matches the dynamic bolt.

[0005] The tooling of this technical solution rotates the threaded sleeve to make the positioning cone move axially, and the positioning cone cooperates with the conical surface of the three-flap fixing plate to make the three-flap fixing plate achieve uniform radial expansion, and the radial expansion of the three-flap fixing plate stops after encountering resistance, thereby achieving fixation between the valve seat of the fixed hard-sealed three-way ball valve, and when the three-flap fixing plate expands radially, the elastic member provides continuous resilience, and the axial movement of the dynamic bolt is adjusted by rotating the adjusting nut, so that the three-flap fixing plate drives the valve seat on its periphery to move axially, and through the working process of "rotational drive-conical surface tensioning-elastic rebound-axial traction", the valve seat of the fixed hard-sealed three-way ball valve is efficiently, accurately and quickly adjusted. The control process is fast and convenient, the conical surface cooperates with the inner hole of the valve seat to automatically center, no manual adjustment is required, the positioning error is small, and the self-centering accuracy is effectively improved. When the threaded sleeve drives the positioning cone to move axially, the three-petal fixed plate expands radially and evenly, and automatically stops when encountering resistance after being embedded in the bottom of the annular groove in the center hole of the valve seat, avoiding damage to the valve seat due to excessive force. The elastic part provides continuous elastic force to buffer the vibration during tension and expansion, thereby improving the reliability of dynamic tensioning. The dynamic bolt and the adjusting nut form a traction closed loop to achieve precise control of the valve seat displacement, effectively realizing efficient, high-precision, low-labor-intensity and adaptive operation of the assembly and disassembly process of the fixed hard-sealed three-way ball valve.

[0006] As a preferred technical approach, the radial guide connection structure comprises three radial slots in the radial guide plate, guide sleeves that slide radially with the slots, and connecting bolts for connecting the three-petal retaining plate and the radial guide plate. The guide sleeves are positioned within the slots, and the connecting bolts extend downward through the guide sleeves and connect to threaded holes in the three-petal retaining plate. Flat washers are positioned between the bolt ends, and a gap is provided between the flat washers and the radial guide plate. This structure effectively guides the radial expansion and contraction of the three-petal retaining plate, enabling smooth and reliable expansion and contraction of the plate solely in the radial direction.

[0007] As a preferred technical measure, the connecting bolts are provided with annular grooves at their ends. The elastic member is a cylindrical helical tension spring, the inner side of which is sheathed in the annular grooves outside the three connecting bolts and held in an elastically tensioned state. This forms an elastic tensioning mechanism. The spring preload ensures dynamic and stable tensioning of the three-petal retaining plate during radial expansion. During removal, the spring's contraction force drives the three-petal retaining plate back in stages, allowing it to quickly and reliably disengage from the annular groove of the valve seat.

[0008] As a preferred technical means, the receiving thread sleeve adopts a stepped sleeve with a larger diameter at the top and a smaller diameter at the bottom. The larger diameter section at the top is convenient for manual or tool rotation.

[0009] As a preferred technical approach, the load-bearing frame utilizes a three-legged star-shaped frame, with the three legs evenly spaced in a 120-degree circle. Each leg has several bolt holes at the outer end. This even distribution of the three legs helps maintain a balanced axial pulling force on the dynamic bolts, reducing the risk of valve seat deflection during the pulling process. The bolt holes at the outer ends of each leg facilitate attachment of the load-bearing frame to the fixed end face of the fixed, hard-seal, three-way ball valve.

[0010] As a preferred technical measure, the mating surface roughness of the three-petal fixed plate and radial guide plate is Ra ≤ 0.8, the roughness of the elongated hole of the radial guide plate is Ra ≤ 1.6, and the guide sleeve is tempered to an outer diameter roughness of Ra ≤ 1.6. This low-roughness surface significantly reduces the coefficient of friction during movement and reduces energy loss. The tempered guide sleeve has a higher hardness, effectively improving wear resistance and service life.

[0011] As a preferred technical measure, the axial length of the guide sleeve is 0.2-0.3 mm greater than the thickness of the radial guide plate. This creates a gap between the tail of the connecting bolt and the corresponding end face of the three-petal fixing plate in the axial direction. When the three-petal fixing plate expands, it will not collide or interfere with the tail of the connecting bolt.

[0012] Beneficial effects: Automatic alignment is achieved through the cooperation between the three-petal fixing plate and the conical surface of the positioning cone, which effectively improves the positioning error control accuracy without manual adjustment. The cooperation between the annular flange and the annular groove of the valve seat forms a rigid clamping, which improves the clamping force and has a significant anti-loosening effect. The design of the radial guide connection structure and the elastic part enables the three-petal fixing plate to move radially with the lifting and lowering of the positioning cone and realize elastic dynamic tensioning, which can not only compensate for dimensional errors and reduce friction loss, but also enable the three-petal fixing plate to be quickly retracted through the contraction force of the elastic part during removal, shortening the disassembly time. The threaded pair design of the threaded sleeve and the positioning cone can stop when encountering resistance when tightening to avoid excessive force. The traction structure composed of dynamic bolts, adjusting nuts and bearing frames can realize precise control of the axial displacement of the valve seat, and the three-legged star design of the bearing frame ensures uniform traction. The entire tooling realizes efficient self-centering, reliable tightening, precise traction and convenient disassembly and assembly through structural integration, greatly improving the accuracy and efficiency of ball valve assembly and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Figure 2 It is a blasting schematic diagram of the present invention.

[0015] Figure 3 It is a schematic diagram of a radial cross-section of the present invention along the axis.

[0016] Figure 4 It is a schematic diagram of the use of the present invention.

[0017] In the figure: 1. Three-petal fixing plate; 2. Positioning cone; 3. Radial guide plate; 4. Threaded sleeve; 5. Dynamic bolt; 6. Adjusting nut; 7. Load-bearing frame; 8. Elastic member; 9. Guide sleeve; 10. Connecting bolt; 11. Flat washer; 12. Valve body; 13. Valve seat; 101. Annular flange; 201. Positioning cone; 202. Threaded connection; 301. Long hole; 1001. Screw tail; 1002. Annular groove; 1301. Annular groove. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.

[0019] Example 1 like Figure 1-Figure 3As shown, a conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve includes a three-flap fixed plate 1, a positioning conical body 2, a radial guide plate 3, a receiving threaded sleeve 4, a dynamic bolt 5, an adjusting nut 6 and a bearing frame 7. The positioning conical body 2 includes a positioning conical body portion 201 of a truncated cone structure and a columnar threaded connection portion 202 located above the positioning conical body portion 201. The outer periphery of the positioning conical body portion 201 is matched with the inner hole of the three-flap fixed plate 1 through a conical surface. The radial guide plate 3 is arranged above the three-flap fixed plate 1, the receiving threaded sleeve 4 is arranged above the radial guide plate 3, and the threaded connection portion After 202 passes upward through the inner hole of the three-petal fixing plate 1 and the inner hole of the radial guide plate 3, it is screwed into the internal threaded hole of the receiving threaded sleeve 4. The radial guide plate 3 and the three-petal fixing plate 1 are connected by a radial guide connection structure and an elastic member 8, so that the three-petal fixing plate 1 can perform corresponding radial contraction and elastic dynamic tensioning when the positioning cone 2 is raised and lowered. An annular flange 101 is provided on the outer periphery of the three-petal fixing plate 1. After the dynamic bolt 5 passes through the center hole of the bearing frame 7 from top to bottom, its lower end is screwed into the internal threaded hole from the upper end of the receiving threaded sleeve 4. The adjusting nut 6 is provided on the upper end of the bearing frame 7 and matches the dynamic bolt 5.

[0020] In order to enable the three-petal fixing plate 1 to achieve smooth and reliable expansion and contraction operations only in the radial direction, the radial guide connection structure includes three radial long holes 301 located on the radial guide plate 3, a guide sleeve 9 that slides in the radial direction with the long holes 301, and a connecting bolt 10 for connecting the three-petal fixing plate 1 and the radial guide plate 3. The three radial long holes 301 are evenly distributed around 120 degrees, and the guide sleeve 9 is arranged in the long hole 301. The connecting bolt 10 passes through the guide sleeve 9 from top to bottom and is connected to the threaded hole on the three-petal fixing plate 1. A flat washer 11 is provided between the screw tail 1001 of the connecting bolt 10. The axial length dimension of the guide sleeve 9 is 0.2 mm larger than the thickness dimension of the radial guide plate 3, so that the screw tail 1001 of the connecting bolt 10 forms a 0.2 mm gap between the axial direction and the end face of the three-petal fixing plate 1. When the three-petal fixing plate 1 expands, it will not collide or interfere with the screw tail 1001 of the connecting bolt 10. This structure effectively realizes the radial expansion and contraction guiding structure of the three-petal fixing plate 1, so that the three-petal fixing plate 1 can realize smooth and reliable expansion and contraction operations only in the radial direction.

[0021] In order to facilitate the rotation operation, the outer shape of the threaded sleeve 4 is a stepped sleeve with a larger diameter at the top and a smaller diameter at the bottom. The upper large diameter section is convenient for manual or tool rotation operation.

[0022] To reduce friction during radial expansion and contraction of the three-petal retaining plate 1, the mating surface between the three-petal retaining plate 1 and the radial guide plate 3 has a roughness of Ra ≤ 0.8, while the roughness of the slotted hole 301 of the radial guide plate 3 has a roughness of Ra ≤ 1.6. The guide sleeve 9 has been tempered to an outer diameter roughness of Ra ≤ 1.6. This low-roughness surface significantly reduces the coefficient of friction during movement and minimizes energy loss. The tempered guide sleeve has a higher hardness, effectively improving wear resistance and service life.

[0023] like Figure 4 As shown, when assembling or disassembling the fixed hard-sealed three-way ball valve, the tooling is used to radially connect and axially move the right valve seat 13 as an example. The axial direction of the tooling is adjusted to the left and right horizontal directions according to the right flow channel direction of the fixed hard-sealed three-way ball valve body 12. The three-petal fixed plate 1 is located on the left, and the adjusting nut 6 is located on the right. The tooling is divided into a tensioning connection part on the left and an axial movement adjustment part on the right. The left part is the tensioning connection part, the purpose of which is to connect and fix with the valve seat 13, including the three-petal fixed plate 1, the positioning cone 2, the radial guide plate 3, the receiving threaded sleeve 4, and the radial guide connection structure. and the elastic member 8, by manually or with a tool, rotating the receiving threaded sleeve 4 clockwise, the positioning cone 2 moves to the right, and the three-petal fixing plate 1 expands radially outward through the tapered surface cooperation. When the annular flange 101 on the outer periphery of the three-petal fixing plate 1 cooperates with the annular groove 1301 of the center hole of the valve seat 13, a rigid clamping is formed. At this time, the resistance increases to stop the rotation of the receiving threaded sleeve 4, avoiding excessive force. At the same time, the elastic tensioning member between the radial guide plate 3 and the three-petal fixing plate 1 is stretched due to the radial movement of the three-petal fixing plate 1, generating elastic deformation to maintain the tension and buffer vibration. The movable adjustment unit comprises a dynamic bolt 5, an adjusting nut 6, and a bearing frame 7. The left end of the dynamic bolt 5 screws into the internally threaded hole at the right end of the receiving threaded sleeve 4. The bearing frame 7 is bolted to the flow channel port on the right side of the fixed hard-seal three-way ball valve body 12. By rotating the adjusting nut 6 at the upper end of the bearing frame 7, traction is generated along the axial direction of the dynamic bolt 5. This force is transmitted through the bearing frame 7 and the dynamic bolt 5 to the receiving threaded sleeve 4, thereby pulling the tension connection to the right axial direction, achieving precise axial movement of the valve seat 13. The entire process achieves efficient assembly and removal of the valve seat 13 through the coordinated effects of conical self-centering, dynamic tensioning, elastic rebound, and traction closed-loop control.

[0024] When removing the tooling, rotate the adjusting nut 6 counterclockwise to release the traction, use a tool to rotate the dynamic bolt 5 to disengage it from the rotating receiving threaded sleeve 4, then remove the connection between the load-bearing frame 7 and the valve, rotate the receiving threaded sleeve 4 counterclockwise, and the positioning cone 2 moves axially to the left. Under the contraction force of the elastic tensioner, the three-petal fixing plate 1 shrinks by 0.2 mm for every 15° rotation of the receiving threaded sleeve 4, and retracts radially inward in stages to disengage from the annular groove 1301 of the center hole of the valve seat 13, completing the tooling disassembly and shortening the disassembly time.

[0025] The tooling realizes automatic centering through the cooperation of the three-petal fixing plate 1 and the conical surface of the positioning cone 2, and can effectively improve the positioning error control accuracy without manual adjustment. The cooperation of the annular flange 101 and the annular groove 1301 of the valve seat 13 forms a rigid clamping. The annular flange 101 is embedded in the bottom of the groove to form a mechanical self-locking, which effectively prevents the valve seat 13 from displacing during the assembly process, improves the clamping force and has a significant anti-loosening effect. The design of the radial guide connection structure and the elastic member 8 enables the three-petal fixing plate 1 to move radially with the lifting of the positioning cone 2 and realize elastic dynamic tensioning, which can not only compensate for the displacement of the valve seat 13, but also improve the stability of the valve seat 13. The traction structure composed of the dynamic bolt 5, the adjusting nut 6 and the load-bearing frame 7 can realize the precise control of the axial displacement of the valve seat 13. The whole tooling realizes efficient self-centering, reliable tightening, precise traction and convenient assembly and disassembly through structural integration, which greatly improves the accuracy and efficiency of ball valve assembly and reduces labor intensity.

[0026] In this embodiment, the dynamic bolt 5 is a full-thread stud, and the adjusting nut 6 is an I-type hexagonal nut.

[0027] Example 2 Unlike the first embodiment above, the screw tails 1001 of the connecting bolts 10 are provided with an annular groove 1002. The elastic member 8 is a cylindrical helical tension spring. The inner side of the cylindrical helical tension spring is sheathed in the annular grooves 1002 on the outer sides of the screw tails 1001 of the three connecting bolts 10 and is in an elastically tensioned state. This forms an elastic tensioning mechanism. The spring preload ensures that the three-petal retaining plate 1 is dynamically and smoothly tensioned during radial expansion. During removal, the spring's contraction force drives the three-petal retaining plate 1 back, quickly and reliably disengaging the annular groove 1301 of the valve seat 13.

[0028] Example 3 Unlike the first and second embodiments above, the support frame 7 utilizes a three-legged star-shaped frame. The three legs of the support frame 7 are evenly spaced in a 120-degree circle, and each leg has two bolt holes at its outer end. These three legs are evenly spaced around the frame to ensure balanced axial pulling force on the dynamic bolt 5 and prevent deflection of the valve seat 13 during the pulling process. The bolt holes at the outer ends of each leg facilitate the connection and fixing of the support frame 7 to the fixed end face of the fixed hard-seal three-way ball valve body 12.

[0029] The conical self-centering tool for disassembly and assembly of a fixed hard-sealed three-way ball valve shown above is a specific embodiment of the present invention, which has embodied the essential characteristics and progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc. can be made to it, which are all within the scope of protection of this scheme.

Claims

1. A conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve, characterized by: It includes a three-petal fixing plate, a positioning cone, a radial guide plate, a receiving threaded sleeve, a dynamic bolt, an adjusting nut and a bearing frame. The positioning cone includes a positioning cone body portion with a truncated cone structure and a columnar threaded connection portion located above the positioning cone body portion. The outer periphery of the positioning cone body portion and the inner hole of the three-petal fixing plate are matched through a conical surface. The radial guide plate is arranged above the three-petal fixing plate. The receiving threaded sleeve is arranged above the radial guide plate. After the threaded connection portion passes upward through the inner hole of the three-petal fixing plate and the inner hole of the radial guide plate, it is screwed into the receiving threaded sleeve. The inner threaded hole of the radial guide plate and the three-petal fixed plate are connected by a radial guide connection structure and an elastic member, so that when the positioning cone body is lifted or lowered, the three-petal fixed plate performs corresponding radial contraction and maintains elastic dynamic tension. The outer periphery of the three-petal fixed plate is provided with an annular flange, and the annular flange matches the annular groove provided in the valve seat center hole of the fixed hard-sealed three-way ball valve. After the dynamic bolt passes through the bearing frame from top to bottom, its lower end is screwed into the inner threaded hole from the upper end of the receiving threaded sleeve. The adjusting nut is provided at the upper end of the bearing frame and matches the dynamic bolt.

2. The conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve according to claim 1, characterized in that: The radial guide connection structure includes three radial long holes located on the radial guide plate, a guide sleeve that slides with the long holes in the radial direction, and connecting bolts for connecting the three-petal fixing plate and the radial guide plate. The guide sleeve is arranged in the long hole, and the connecting bolt passes through the guide sleeve from top to bottom and is connected to the threaded hole set in the three-petal fixing plate. A flat washer is provided between the screw tails of the connecting bolt, and a gap is provided between the flat washer and the radial guide plate.

3. The conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve according to claim 2, characterized in that: The screw tail of the connecting bolt is provided with an annular groove, and the elastic member is a cylindrical helical tension spring. The inner side of the cylindrical helical tension spring is sleeved in the annular groove on the outer side of the screw tail of the three connecting bolts and is in an elastic tension state.

4. The conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve according to claim 1, characterized in that: The receiving thread sleeve adopts a stepped sleeve with a larger diameter at the top and a smaller diameter at the bottom.

5. The conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve according to claim 1, characterized in that: The load-bearing frame adopts a three-legged star-shaped frame, the three legs of the load-bearing frame are evenly distributed in a 120-degree circle, and the outer end of each leg is provided with a plurality of bolt holes.

6. The conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve according to claim 2, characterized in that: The roughness of the joint surface between the three-petal fixing plate and the radial guide plate is Ra≤0.8, the roughness of the long hole of the radial guide plate is Ra≤1.6, and the guide sleeve is tempered, and the outer circle roughness of the guide sleeve is Ra≤1.

6.

7. The conical self-centering tool for disassembling and assembling a fixed hard-sealed three-way ball valve according to claim 6, characterized in that: The axial length of the guide sleeve is 0.2-0.3 mm greater than the thickness of the radial guide plate.

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