A rotor yoke lamination positioning pin lifting device

Abstract

The present invention relates to a rotor yoke lamination locating pin lifting device, which comprises a hydraulic pressure device, a locating lifting rod, a fixing nut and an annular hydraulic cylinder, wherein an annular cylinder barrel is provided in the annular hydraulic cylinder, a piston barrel is provided in the annular cylinder barrel, a connecting stud for connecting the yoke lamination locating pin is provided at the bottom end of the locating lifting rod, and a threaded section is provided at the top end. The present invention adopts hydraulic oil cylinder drive for operation control, the lifting force meets the lifting requirements, the pulling force is uniform, stable and controllable, the lifting height can be measured and controlled in real time, the center of the lifting device is basically coincident with the center of the yoke lamination locating pin, so that the force applied during the lifting process of the yoke lamination locating pin is vertical, there is no horizontal force component, no shear force is generated, and the bolt shearing is not easy to occur, the operation is safe and reliable, and the construction safety risk is low.

Description

Technical Field

[0001] The invention relates to the technical field of assembly of hydropower station unit equipment, in particular to a rotor yoke lamination positioning pin lifting device and a lifting method thereof. Background Art

[0002] At present, the rotors of large hydro-turbine generator sets are delivered in scattered parts and assembled into a whole through a series of processes on site. The yoke stacking is one of the key processes in rotor assembly, and its quality will directly affect the quality of the rotor pole mounting. There are two main ways to position the yoke stacking: "yoke key + stacking pin" and "yoke key + permanent screw". The "yoke key + stacking pin" positioning method is currently the most widely used one. The yoke key plays a circumferential positioning role, and the stacking pin plays a radial positioning role. There are other tools such as dove tail positioning tools for auxiliary positioning. As the stacking height increases, the stacking pin also needs to be lifted. Basically, the yoke positioning pin is lifted once for every 200mm stack height. There are usually two ways to lift the stacking pin:

[0003] "Lever method" - first install the lifting ring in the bolt hole of the stacked pin, place a square wood with a thickness of about 120mm on the yoke punching plate, use the lifting ring as a fulcrum, use the crowbar placed on the wood square to manually press down the crowbar, and lift the pin as the crowbar is pressed down. Generally, it takes many repetitions to lift to a height of 200mm, and the lifting efficiency is low.

[0004] "Electric hoist lifting method" - first install the lifting ring in the bolt hole of the stacked pin, connect it to the wire rope with a shackle, and hang the other end of the wire rope on the electric hoist hook of the factory bridge crane. After adjustment, lift the hook and then lift the pin.

[0005] In actual construction, due to the influence of factors such as yoke shape, yoke punching cleaning process, and yoke stacking positioning accuracy, the following problems mainly exist:

[0006] For the cleaning-free yoke punching sheets, affected by the punching sheet processing accuracy and the positioning accuracy when the yoke is stacked, there is a stepped distribution on the yoke surface, which causes the matching clearance between the stacking pins and the screw holes to further decrease. The "lever method" is difficult to lift because of insufficient and uneven force.

[0007] When using the "electric hoist lifting method", since the center of the hook cannot be guaranteed to completely coincide with the center of the stacked pin during the lifting process, there will be a horizontal force component during lifting. Since the friction between the stacked pin and the yoke punching is large, the lifting force required at the moment of lifting is also greater, and the corresponding horizontal force component is also greater, which will cause the lifting ring to be sheared, and abnormal situations such as the lifting ring breaking may occur easily, posing a greater safety risk.

[0008] The lifting force provided by the above two methods has poor stability and is uncontrollable; more operators are required and the work efficiency is low. Summary of the invention

[0009] In order to solve the problems in the above background technology, the present invention provides a rotor yoke lamination positioning pin lifting device and a lifting method thereof. The technical solution adopted by the present invention to solve the technical problem is:

[0010] A rotor yoke lamination positioning pin lifting device comprises a hydraulic pressurizing device, a positioning lifting rod, a fixing nut and an annular hydraulic cylinder; an annular cylinder barrel is provided in the annular hydraulic cylinder, a piston barrel is provided in the annular cylinder barrel, a connecting stud for connecting the yoke lamination positioning pin is provided at the bottom end of the positioning lifting rod, and a threaded section with a square head is provided at the top end; the annular hydraulic cylinder is a hollow cylinder with a cylindrical cavity inside, the positioning lifting rod is provided in the cylindrical cavity of the annular hydraulic cylinder, and the top end of the positioning lifting rod is connected to the piston barrel through a fixing nut; an oil inlet and outlet port is provided at the bottom of the annular cylinder barrel, and a quick pipe joint is provided on the outer side wall of the bottom of the annular hydraulic cylinder, the quick pipe joint is connected to the oil inlet and outlet port, and is connected to the hydraulic pressurizing device through a hydraulic oil pipe provided.

[0011] Further preferably, the piston cylinder is in the shape of a hollow cylinder with a top surface, and the top end of the positioning lifting rod is connected to the center of the top surface of the piston cylinder through a fixing nut.

[0012] Preferably, the height of the cylindrical cavity of the annular hydraulic cylinder is 260mm-290mm and the diameter is 50mm-60mm; the diameter of the cylindrical cavity is 10mm-15mm larger than the yoke stack positioning pin, and the height can meet the operational requirement of lifting 200mm at a time.

[0013] Preferably, the piston cylinder is provided with upper and lower sealing grooves, and an O-ring is arranged in the sealing groove; the double-layer seal strengthens the isolation of the hydraulic oil and improves the reliability and durability of the device.

[0014] Preferably, the lower sealing groove is 15 mm away from the bottom of the piston cylinder, and the upper sealing groove is 20 mm away from the bottom of the piston cylinder; the sealing groove is arranged at the bottom of the piston cylinder to improve the isolation effect of the O-ring.

[0015] Furthermore, the above-mentioned rotor yoke lamination positioning pin lifting device is used in a yoke lamination positioning pin lifting method, and the lifting method comprises the following steps:

[0016] Step A: Install the positioning lifting rod, install the connecting stud at the bottom of the positioning lifting rod into the screw hole set at the top of the yoke lamination positioning pin, and tighten the square head at the top of the positioning lifting rod with a wrench to tighten the connecting stud at the bottom;

[0017] Step B, the annular hydraulic cylinder is inserted into the positioning lifting rod from above, the positioning lifting rod is placed in the cylindrical cavity of the annular hydraulic cylinder, the annular hydraulic cylinder is placed on the rotor yoke, the fixing nut is screwed in along the threaded section at the top of the positioning lifting rod until the fixing nut fits with the top of the piston cylinder, and the fixing nut is tightened;

[0018] Step C, the quick pipe joint is connected to the hydraulic pressurizing device through the hydraulic oil pipe, and the annular hydraulic cylinder is pressurized by the hydraulic pressurizing device, so that the piston cylinder drives the yoke lamination positioning pin to lift;

[0019] Step D: After the yoke stack positioning pin is lifted by 200 mm, the lifting process is completed, and the annular hydraulic cylinder is depressurized and the lifting device is removed.

[0020] The beneficial effects of the present invention are as follows: the driving force of the lifting device is controlled by hydraulic cylinder operation, the lifting force meets the lifting requirements, the pulling force is uniform, stable and controllable, and the lifting height of the yoke stack positioning pin can be measured and controlled in real time.

[0021] The lifting device and the positioning lifting rod are connected to the center of the top surface of the piston cylinder, which can ensure that the center of the lifting device is basically consistent with the center of the yoke stack positioning pin, so that the force applied to the yoke stack positioning pin during the lifting process is vertical, without horizontal force component and shear force, and the bolt is not prone to shearing. The operation is safe and reliable, and the construction safety risk is low.

[0022] The present invention can use multiple lifting devices in combination at the same time, and can be equipped with equipment such as a flow diversion device and a pneumatic pump to replace manual work, and can lift multiple yoke stack positioning pins at the same time, thereby greatly improving work efficiency.

[0023] When there is no hydraulic equipment on site, the lifting device can also lift the yoke stack positioning pin by operating the positioning lifting rod.

[0024] The invention has a simple structure, is safe and reliable to operate, and has a very good practical use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the lifting device of the present invention;

[0026] Figure 2 It is a top view of the lifting device of the present invention.

[0027] Parts and numbers in the picture:

[0028] 1-Hydraulic pressure device; 2-Positioning lifting rod; 21-Connecting stud; 22-Threaded section; 23-Fixing nut; 3-Annular hydraulic cylinder; 4-Annular cylinder barrel; 5-Piston barrel; 51-O-ring; 6-Oil inlet and outlet; 7-Quick pipe joint; 8-Yoke stack positioning pin; 9-Rotor yoke. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] like Figures 1-2 As shown, a rotor yoke lamination positioning pin lifting device comprises a hydraulic pressurizing device 1, a positioning lifting rod 2, a fixing nut 23 and an annular hydraulic cylinder 3; an annular cylinder barrel 4 is provided in the annular hydraulic cylinder 3, a piston barrel 5 is provided in the annular cylinder barrel 4, a connecting stud 21 for connecting the yoke lamination positioning pin 8 is provided at the bottom end of the positioning lifting rod 2, and a threaded section 22 with a square head is provided at the top end; the annular hydraulic cylinder 3 is a hollow cylinder with a cylindrical cavity inside, the positioning lifting rod 2 is arranged in the cylindrical cavity of the annular hydraulic cylinder 3, and the top end of the positioning lifting rod 2 is connected to the piston barrel 5 through the fixing nut 23; an oil inlet and outlet port 6 is provided at the bottom of the annular cylinder barrel 4, and a quick pipe joint 7 is provided on the outer side wall of the bottom of the annular hydraulic cylinder 3, the quick pipe joint 7 is connected to the oil inlet and outlet port 6, and is connected to the hydraulic pressurizing device 1 through a hydraulic oil pipe provided.

[0031] Specific implementation process:

[0032] The rotor yoke lamination positioning pin lifting device is used in a yoke lamination positioning pin lifting method, and the lifting method comprises the following steps:

[0033] Step A, install the positioning lifting rod 2, install the connecting stud 21 at the bottom of the positioning lifting rod 2 into the screw hole set at the top of the yoke lamination positioning pin 8, and tighten the square head at the top of the positioning lifting rod 2 with a wrench to tighten the connecting stud 21 at the bottom;

[0034] Step B, the annular hydraulic cylinder 3 is inserted into the positioning lifting rod 2 from above, the positioning lifting rod 2 is placed in the cylindrical cavity of the annular hydraulic cylinder 3, the annular hydraulic cylinder 3 is placed on the rotor yoke 9, the fixing nut 23 is screwed in along the threaded section 22 at the top of the positioning lifting rod 2 until the fixing nut 22 fits with the top of the piston cylinder 5, and the fixing nut 23 is tightened;

[0035] Step C, the quick pipe joint 7 is connected to the hydraulic pressurizing device 1 through the hydraulic oil pipe, and the annular hydraulic cylinder 3 is pressurized by the hydraulic pressurizing device 1, so that the piston cylinder 5 drives the yoke lamination positioning pin 8 to lift;

[0036] Step D: After the yoke stack positioning pin 8 is lifted by 200 mm, the lifting process is completed, and the annular hydraulic cylinder 3 is depressurized and the lifting device is removed.

[0037] The piston cylinder 5 is in the shape of a hollow cylinder with a top surface, and the top end of the positioning lifting rod 2 is bolted to the center of the top surface of the piston cylinder 5 through a fixing nut 23 .

[0038] The cylindrical cavity of the annular hydraulic cylinder 3 has a height of 260 mm to 290 mm and a diameter of 50 mm to 60 mm. The diameter of the cylindrical cavity is 10 mm to 15 mm larger than the yoke lamination positioning pin, and the height can meet the operation requirement of lifting 200 mm at a time.

[0039] The piston cylinder 5 is provided with an upper and a lower sealing groove, and an O-shaped sealing ring 51 is arranged in the sealing groove. The double-layer sealing strengthens the isolation of the hydraulic oil and improves the reliability and durability of the device.

[0040] The lower sealing groove is 15 mm away from the bottom of the piston cylinder 5 , and the upper sealing groove is 20 mm away from the bottom of the piston cylinder 5 . The sealing groove is arranged at the bottom of the piston cylinder 5 to improve the isolation effect of the O-ring 51 .

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotor yoke lamination positioning pin lifting device, comprising a hydraulic pressurizing device (1), characterized in that: It also includes a positioning lifting rod (2), a fixing nut (23) and an annular hydraulic cylinder (3); an annular cylinder barrel (4) is provided inside the annular hydraulic cylinder (3), a piston barrel (5) is provided inside the annular cylinder barrel (4), a connecting stud (21) for connecting to a yoke lamination positioning pin is provided at the bottom end of the positioning lifting rod (2), and a threaded section (22) with a square head is provided at the top end; the annular hydraulic cylinder (3) is a hollow cylinder with a cylindrical cavity inside, the positioning lifting rod (2) is provided in the cylindrical cavity of the annular hydraulic cylinder (3), and the top end of the positioning lifting rod (2) is connected to the piston barrel (5) through the fixing nut (23); an oil inlet and outlet port (6) is provided at the bottom of the annular cylinder barrel (4), and a quick pipe joint (7) is provided on the outer side wall of the bottom of the annular hydraulic cylinder (3), and the quick pipe joint (7) is communicated with the oil inlet and outlet port (6) and is connected to the hydraulic pressure device (1) through a provided hydraulic oil pipe; The piston cylinder (5) is in the shape of a hollow cylinder with a top surface, and the top end of the positioning lifting rod (2) is connected to the center of the top surface of the piston cylinder (5) through a fixing nut (23); The cylindrical cavity of the annular hydraulic cylinder (3) has a height of 260 mm to 290 mm and a diameter of 50 mm to 60 mm; The piston cylinder (5) is provided with upper and lower sealing grooves, and an O-shaped sealing ring (51) is provided in the sealing groove; The lower sealing groove is 15 mm away from the bottom of the piston cylinder (5), and the upper sealing groove is 20 mm away from the bottom of the piston cylinder (5); The lifting method of the rotor yoke lamination positioning pin lifting device comprises the following steps: Step A, installing the positioning lifting rod (2), installing the connecting stud (21) at the bottom end of the positioning lifting rod (2) into the screw hole provided at the top end of the positioning pin of the yoke lamination, and tightening the connecting stud (21) at the bottom end by tightening the square head at the top end of the positioning lifting rod (2) with a wrench; Step B, the annular hydraulic cylinder (3) is inserted into the positioning lifting rod (2) from above, the positioning lifting rod (2) is placed in the cylindrical cavity of the annular hydraulic cylinder (3), the annular hydraulic cylinder (3) is placed on the rotor yoke (9), the fixing nut (23) is screwed in along the threaded section (22) at the top of the positioning lifting rod (2) until the fixing nut (23) is in contact with the top of the piston cylinder (5), and the fixing nut (23) is tightened; Step C, the quick pipe joint (7) is connected to the hydraulic pressure device (1) through the hydraulic oil pipe, and the annular hydraulic cylinder (3) is pressurized by the hydraulic pressure device (1), so that the piston cylinder (5) drives the yoke lamination positioning pin (8) to rise; Step D: After the yoke stack positioning pin is lifted by 200 mm, the lifting process is completed, and the annular hydraulic cylinder (3) is depressurized and the lifting device is removed.

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