A ball valve thin-wall shaft bushing horizontal hot sleeve assembly tool and a using method thereof

Abstract

A kind of ball valve thin-wall shaft bushing horizontal hot sleeve assembly tool and its using method belong to water turbine ball valve assembly technical field.Solve the problem of big assembly difficulty and big valve shaft and ball valve shaft bushing coaxiality error in prior art.Technical points: large flange plate is welded on the left side of sleeve, transition flange is installed on the outside of large flange plate, small flange plate is welded on the right side of sleeve; screw is welded on the outside center of small flange plate, front counterweight plate, thin counterweight plate, rear counterweight plate, nut washer, fastening sleeve and nut are sequentially sleeved on screw.The application is simple in operation and low in cost; under the premise of not changing the wall thickness structure of ball valve shaft bushing, the ball valve thin-wall shaft bushing horizontal hot sleeve assembly tool is used to ensure the stiffness and strength of ball valve shaft bushing; by adjusting the weight of counterweight plate assembly to adjust the levelness, the assembly difficulty is reduced, the assembly time is shortened, and secondary heating and reassembly are avoided; by adding transition flange, the assembly requirements of ball valve shaft bushings with different diameters are met, the universality is improved, and the manufacturing cost is saved.

Description

Technical Field

[0001] This invention relates to the field of turbine ball valve assembly technology, specifically to a horizontal heat-fitting assembly tool for a thin-walled ball valve bushing and its usage method. Background Technology

[0002] The ball valve of the turbine is a key piece of equipment in a hydropower station, used to control water flow and ensure the safe operation of the unit. The assembly process of the ball valve directly affects its sealing performance and service life. The assembly of the valve shaft and the ball valve bushing usually adopts a heat fitting process, which utilizes the principle of thermal expansion and contraction. After heating the bushing and other components, the orifice is enlarged and fitted into the valve shaft and other components. After cooling, an interference fit is formed to ensure the fitting accuracy and reliability.

[0003] Existing heat fitting methods primarily rely on manual operation, depending on experience and trial and error. They employ conventional slings or ropes for single-point lifting of the ball valve bushing, making assembly and leveling difficult. This method is prone to damage from impacts, requires multiple operators, and is cumbersome. The assembly time is also long, and the ball valve bushing temperature drops during assembly, necessitating reheating, which can easily cause scratches on the bushing and valve shaft. Furthermore, manual operation makes it difficult to ensure the coaxiality of the valve shaft and ball valve bushing, easily leading to assembly misalignment, uneven stress distribution after cooling, increasing the risk of fatigue damage to the bushing components, and affecting the overall sealing performance and service life of the ball valve.

[0004] Therefore, there is an urgent need to propose a horizontal heat fitting tool for ball valve thin-walled bushings and its usage method to solve the problems of high assembly difficulty and large coaxiality error between valve shaft and ball valve bushing in the existing technology. Summary of the Invention

[0005] In view of the above facts, in order to solve the problems of high assembly difficulty and large coaxiality error between valve shaft and ball valve bushing in the prior art, the present invention designs a horizontal heat fitting tool for ball valve thin-walled bushing and its usage method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Option 1: A horizontal heat-fitting tool for a thin-walled ball valve bushing, comprising a balance frame, a transition flange, a counterweight plate assembly, a nut, a nut washer, a fastening sleeve, and a screw;

[0008] The balance frame includes a large flange plate, a small flange plate, and a sleeve;

[0009] A large flange plate is welded to the left side of the sleeve, and a transition flange is installed on the outside of the large flange plate. A small flange plate is welded to the right side of the sleeve.

[0010] The counterweight plate assembly includes a front counterweight plate, a thin counterweight plate, and a rear counterweight plate;

[0011] A screw rod is welded to the center of the outer side of the small flange plate, and the front counterweight plate, thin counterweight plate, rear counterweight plate, nut washer, fastening sleeve and nut are sequentially fitted onto the screw rod.

[0012] Furthermore: the inner side of the large flange plate is welded to the sleeve with 6 stiffening plates, and the inner side of the small flange plate is welded to the sleeve with 6 stiffening plates.

[0013] Furthermore: the top of the sleeve is welded with a main lifting lug;

[0014] Four auxiliary lifting lugs are evenly welded to the outer side of the small flange plate.

[0015] Furthermore: a flat plate is provided on the sleeve, and a frame-type level is placed on the flat plate.

[0016] Furthermore, two adjustment handles are welded onto the rear counterweight plate.

[0017] Furthermore, the large flange and the transition flange are fixed by bolts and bolt washers.

[0018] Option 2: The method of using the ball valve thin-walled bushing horizontal heat fitting tool described in Option 1 is as follows:

[0019] S1: Horizontally assemble the transition flange and ball valve bushing, and secure them with hex socket screws and screw washers;

[0020] S2: Adjust the counterweight plate assembly by adding or removing weights to roughly adjust the levelness;

[0021] S3: Loosen the hex socket screws and screw washers, and remove the transition flange and ball valve bushing;

[0022] S4: Place the ball valve bushing upright with the assembly hole facing upward and push it into the heating furnace. Heat it at a heating temperature of 200℃ for 4 hours to ensure that the inner diameter expansion of the ball valve bushing meets the assembly requirements.

[0023] S5: After reaching the heating time and heating temperature, remove the ball valve bushing, vertically lift the ball valve thin-walled bushing horizontal heat fitting tool, adjust the coaxiality of the ball valve thin-walled bushing horizontal heat fitting tool and the ball valve bushing, and fix it with hexagon socket screws and screw washers;

[0024] S6: The assembly of the ball valve thin-walled bushing horizontal heat fitting tool and the ball valve bushing is laid flat and checked with a frame level. The main and auxiliary lifting lugs are pulled to fine-tune until the levelness meets 0.05mm / m.

[0025] S7: Slowly push the small flange plate and shake the adjustment handle left and right to make the radial clearance between the ball valve bushing and the valve shaft uniform, ensuring that there is no jamming throughout the process, until the ball valve bushing is completely fitted into the valve shaft.

[0026] S8: Loosen the bolts and bolt washers, remove the transition flange and large flange plate, and remove the transition flange after the ball valve bushing has cooled to room temperature.

[0027] Further: In step S4, the formula for calculating the heating temperature is:

[0028] ;

[0029] Where A is the expansion amount, which is 1-3 mm;

[0030] K is the coefficient of thermal expansion, K = 16.5 × 10⁻⁶ -6 (1 / ℃);

[0031] D1 is the inner diameter of the ball valve bushing, D1=900mm;

[0032] t represents room temperature, taken as 20℃.

[0033] Further: In step S4, the formula for calculating the heating time is:

[0034] ;

[0035] Wherein, K0 is the thermal insulation coefficient, which is taken as 2-4;

[0036] This represents the temperature change value;

[0037] G is the weight of the ball valve bushing, G=299Kg;

[0038] C is the specific heat capacity of the ball valve bushing, C = 0.5 KJ / ( );

[0039] P is the power of the heating furnace, P=120KW.

[0040] The beneficial effects of this invention are as follows:

[0041] 1. This invention is simple to operate, easy to implement, and low in cost.

[0042] 2. This invention, without altering the wall thickness structure of the ball valve bushing, employs a horizontal heat fitting tool for the thin-walled ball valve bushing to ensure the rigidity and strength of the ball valve bushing.

[0043] 3. This invention adjusts the levelness by adjusting the weight of the counterweight plate assembly, reducing assembly difficulty, shortening assembly time, and avoiding reheating and reassembly.

[0044] 4. By adding a transition flange, this invention meets the assembly requirements of ball valve bushings of different diameters, improves versatility, and saves manufacturing costs. Attached Figure Description

[0045] Figure 1This is an assembly drawing of the assembly tool for the horizontal heat-shrinkable ball valve thin-walled bushing in this invention;

[0046] Figure 2 This is a diagram showing the positional relationship between the ball valve bushing and the horizontal heat fitting tool for the ball valve thin-walled bushing in this invention;

[0047] Figure 3 This is a right view of the horizontal heat fitting tool for the thin-walled bushing of the ball valve in this invention;

[0048] Figure 4 This is a diagram showing the positional relationship between the ball valve bushing, transition flange, and large flange plate in this invention.

[0049] In the diagram: 1-Balance frame, 2-Transition flange, 3-Hex socket head cap screw, 4-Screw washer, 5-Bolt, 6-Bolt washer, 7-Rear counterweight plate, 8-Adjusting handle, 9-Nut, 10-Nut washer, 11-Front counterweight plate, 12-Thin counterweight plate, 13-Fastening sleeve, 14-Ball valve bushing, 15-Frame level, 16-Large flange plate, 17-Small flange plate, 18-Sleeve, 19-Firming plate, 20-Screw, 21-Secondary lifting lug, 22-Main lifting lug, 23-Valve shaft. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0051] The terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0054] Example 1: A ball valve thin-walled bushing horizontal heat fitting tool according to this example includes a balance frame 1, a transition flange 2, a counterweight plate assembly, a nut 9, a nut washer 10, a fastening sleeve 13, and a screw 20;

[0055] The balance frame 1 includes a large flange plate 16, a small flange plate 17, and a sleeve 18;

[0056] A large flange plate 16 is welded to the left side of the sleeve 18, and a transition flange 2 is installed on the outside of the large flange plate 16. A small flange plate 17 is welded to the right side of the sleeve 18.

[0057] The counterweight plate assembly includes a front counterweight plate 11, a thin counterweight plate 12, and a rear counterweight plate 7;

[0058] A screw 20 is welded to the outer center of the small flange plate 17. The front counterweight plate 11, the thin counterweight plate 12, the rear counterweight plate 7, the nut washer 10, the fastening sleeve 13, and the nut 9 are sequentially fitted onto the screw 20.

[0059] More specifically: the inner side of the large flange plate 16 is welded to the sleeve 18 with 6 stiffening plates 19, and the inner side of the small flange plate 17 is welded to the sleeve 18 with 6 stiffening plates 19.

[0060] More specifically: the top of the sleeve 18 is welded with a main lifting lug 22, and the lifting point is located directly above the combined center of gravity of the ball valve bushing 14 and the ball valve thin-walled bushing horizontal hot fitting tool;

[0061] Four auxiliary lifting lugs 21 are evenly welded to the outer side of the small flange plate 17.

[0062] More specifically: a flat plate is provided on the sleeve 18, and a frame level 15 is placed on the flat plate.

[0063] More specifically: Two adjustment handles 8 are welded onto the rear counterweight plate 7.

[0064] More specifically: the large flange plate 16 and the transition flange 2 are fixed by bolts 5 and bolt washers 6.

[0065] More specifically: the outer diameter of the large flange plate 16 is 1100mm, and the large flange plate 16 is provided with 8 through holes, the distance between the center of each through hole and the center of the large flange plate is 1000mm;

[0066] The outer diameter of the small flange plate 17 is 800 mm, and a central hole is provided on the small flange plate 17;

[0067] The sleeve 18 is 2000mm long;

[0068] The transition flange 2 has an outer diameter of 1060mm and an inner diameter of 860mm. The outer side of the transition flange 2 is provided with a recessed stop hole with a diameter of 940mm, and the transition flange 2 is provided with an assembly hole.

[0069] Example 2: The method of using the ball valve thin-walled bushing horizontal heat fitting tool described in Example 1 is as follows:

[0070] S1: Horizontally assemble the transition flange 2 and the ball valve bushing 14, and fix them with hexagon socket screws 3 and screw washers 4;

[0071] S2: Adjust the counterweight plate assembly by adding or removing weights to roughly adjust the levelness;

[0072] S3: Loosen the socket head cap screw 3 and screw washer 4, and remove the transition flange 2 and ball valve bushing 14;

[0073] S4: Place the ball valve bushing 14 upright with the assembly hole facing upward and push it into the heating furnace. Heat it at a heating temperature of 200℃ and a heating time of 4 hours to ensure that the inner diameter expansion of the ball valve bushing 14 meets the assembly requirements.

[0074] S5: After the heating time and heating temperature are reached, remove the ball valve bushing 14, lift the ball valve thin-walled bushing horizontal heat fitting tool vertically, adjust the coaxiality of the ball valve thin-walled bushing horizontal heat fitting tool and the ball valve bushing 14, and fix it with the internal hex screw 3 and screw washer 4;

[0075] S6: The assembly of the ball valve thin-walled bushing horizontal heat fitting tool and the ball valve bushing 14 is laid flat and suspended. The assembly is checked with a frame level 15. The main lifting lug 22 and the auxiliary lifting lug 21 are pulled to fine-tune until the levelness meets 0.05mm / m.

[0076] S7: Slowly push the small flange plate 17 and shake the adjustment handle 8 left and right to make the radial gap between the ball valve bushing 14 and the valve shaft 23 uniform, ensuring that there is no jamming throughout the process, until the ball valve bushing 14 is completely fitted into the valve shaft 23.

[0077] S8: Loosen bolts 5 and bolt washers 6, remove transition flange 2 and large flange plate 16, and remove transition flange 2 after ball valve bushing 14 has cooled to room temperature.

[0078] More specifically: In step S4, the formula for calculating the heating temperature is:

[0079] ;

[0080] Where A is the expansion amount, which is 1-3 mm;

[0081] K is the coefficient of thermal expansion, K = 16.5 × 10⁻⁶ -6 (1 / ℃);

[0082] D1 is the inner diameter of the ball valve bushing 14, D1=900mm;

[0083] t represents room temperature, taken as 20℃.

[0084] More specifically: In step S4, the formula for calculating the heating time is:

[0085] ;

[0086] Wherein, K0 is the thermal insulation coefficient, which is taken as 2-4;

[0087] This represents the temperature change value;

[0088] G is the weight of the ball valve bushing 14, G=299Kg;

[0089] C is the specific heat capacity of the ball valve bushing 14, C = 0.5 KJ / ( );

[0090] P is the power of the heating furnace, P=120KW.

[0091] More specifically: the outer diameter of the ball valve bushing 14 is 930 mm.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; as long as there is no structural conflict, the various features in the specific embodiments disclosed in this application can be combined with each other in any way, and will not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

[0093] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for using a ball valve thin-walled bushing horizontal heat fitting tool, which is based on a ball valve thin-walled bushing horizontal heat fitting tool, including a balance frame (1), a transition flange (2), a counterweight plate assembly, a nut (9), a nut washer (10), a fastening sleeve (13), and a screw (20). The balance frame (1) includes a large flange plate (16), a small flange plate (17), and a sleeve (18). A large flange plate (16) is welded to the left side of the sleeve (18), and a transition flange (2) is installed on the outside of the large flange plate (16). A small flange plate (17) is welded to the right side of the sleeve (18). The counterweight plate assembly includes a front counterweight plate (11), a thin counterweight plate (12), and a rear counterweight plate (7). A screw rod (20) is welded to the outer center of the small flange plate (17). The front counterweight plate (11), thin counterweight plate (12), rear counterweight plate (7), nut washer (10), fastening sleeve (13), and nut (9) are sequentially fitted onto the screw rod (20). The top of the sleeve (18) is welded with the main lifting lug (22); Four auxiliary lifting lugs (21) are evenly welded to the outer side of the small flange plate (17); Its features are, Specifically: S1: Horizontally assemble the transition flange (2) and the ball valve bushing (14) and fix them with hexagon socket screws (3) and screw washers (4); S2: Adjust the counterweight plate assembly by adding or removing weights to roughly adjust the levelness; S3: Loosen the hex socket screw (3) and screw washer (4), and remove the transition flange (2) and ball valve bushing (14). S4: Place the ball valve bushing (14) upright with the assembly hole facing upward and push it into the heating furnace. Heat it at a heating temperature of 200℃ and a heating time of 4h to ensure that the inner circle expansion of the ball valve bushing (14) meets the assembly requirements. S5: After the heating time and heating temperature are reached, take out the ball valve bushing (14), lift the ball valve thin-wall bushing horizontal heat fitting tool vertically, adjust the coaxiality of the ball valve thin-wall bushing horizontal heat fitting tool and the ball valve bushing (14), and fix it with internal hexagon screws (3) and screw washers (4); S6: The assembly of the ball valve thin-walled bushing horizontal heat fitting tool and the ball valve bushing (14) is laid flat and checked with a frame level (15). The main lifting lug (22) and the auxiliary lifting lug (21) are pulled to finely adjust until the levelness meets 0.05mm / m. S7: Slowly push the small flange plate (17) and shake the adjustment handle (8) left and right to make the radial gap between the ball valve bushing (14) and the valve shaft (23) uniform, ensuring that there is no jamming throughout the process, until the ball valve bushing (14) is completely fitted into the valve shaft (23). S8: Loosen the bolts (5) and bolt washers (6), remove the transition flange (2) and large flange plate (16), and remove the transition flange (2) after the ball valve bushing (14) has cooled to room temperature.

2. The method of using the ball valve thin-walled bushing horizontal heat fitting tool according to claim 1, characterized in that, The inner side of the large flange plate (16) is welded to the sleeve (18) with six stiffening plates (19), and the inner side of the small flange plate (17) is welded to the sleeve (18) with six stiffening plates (19).

3. The method of using the horizontal heat-fitting tool for a thin-walled ball valve bushing according to claim 1, characterized in that, A flat plate is provided on the sleeve (18), and a frame level (15) is placed on the flat plate.

4. The method of using the horizontal heat-fitting tool for a thin-walled ball valve bushing according to claim 1, characterized in that, Two adjustment handles (8) are welded onto the rear counterweight plate (7).

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