Dismounting tool for middle shaft sleeve of guide vane of water-turbine generator set without lifting crank arm

Abstract

The utility model provides a water-turbine generator set guide vane middle shaft sleeve dismounting tool without lifting a crank arm, which comprises two groups of semi-circular rings, the two groups of semi-circular rings form an adapter ring, and the semi-circular rings are provided with through holes corresponding to middle shaft sleeve sealing pressing plate mounting holes on a guide vane middle shaft sleeve. Bolts penetrate through the through holes and then are installed in middle shaft sleeve sealing pressing plate installation holes in a guide vane middle shaft sleeve, a plurality of threaded holes matched with jackscrews are formed in the semicircular ring, a reference circle where the threaded holes are distributed is arranged above an installation base of the top cover, and the jackscrews are arranged on the upper side of the installation base of the top cover. The jackscrew is screwed through a wrench, so that the adapter ring drives the guide vane middle shaft sleeve to move upwards. The tool can disassemble the guide vane middle shaft sleeve in advance under the condition that a crank arm and an upper shaft sleeve are not hoisted, and the situation that disassembly of the guide vane middle shaft sleeve occupies a linear construction period is avoided.

Description

Technical Field

[0001] The utility model relates to the field of maintenance of a water turbine generator set, in particular to a tool for disassembling a shaft sleeve in a guide vane of a water turbine generator set without a lifting arm. Background Art

[0002] The turbine generator set of a hydropower station needs to be overhauled every 10 to 15 years. During the overhaul, the top cover needs to be lifted out. Before lifting the top cover, it is usually necessary to remove all the movable guide vane center sleeves to prevent the movable guide vane center sleeves from locking the movable guide vane shaft neck during the lifting of the top cover, thereby affecting the lifting of the top cover and thus affecting the maintenance of the unit; the turbine generator set needs routine maintenance every 1 to 2 years. If abnormal conditions such as excessive guide vane operating torque are found before maintenance, it may be necessary to remove the guide vane center sleeves and inspect the center bearing.

[0003] The position relationship of each component in the maintenance area is as follows Figure 1 As shown in the figure, the top cover is installed on the seat ring (not marked in the figure), and the movable guide vane passes through the middle sleeve and the upper sleeve of the guide vane; the middle sleeve of the movable guide vane is installed on the top cover, and the sealing pressure plate of the middle sleeve of the movable guide vane is installed on the middle sleeve; the upper sleeve of the movable guide vane is installed on the top cover, and the crank arm is above the upper sleeve. When overhauling the unit, the sealing pressure plate must be removed first, and then the middle sleeve must be removed in order to finally lift out the top cover.

[0004] The normal disassembly sequence is to lift out the lower frame, remove the crank arm connecting plate, remove the crank arm thrust ring, remove and lift out the crank arm, remove the upper sleeve, and remove the middle sleeve. Since a unit usually has 24 sets of crank arms, sleeves and other water-guiding mechanism components, the clearance between the middle sleeve and the top cover mounting hole is small, and there is often rust on the contact surface, etc., the removal of the middle sleeve is a process with a high risk factor, difficult to disassemble, and time-consuming and labor-intensive. Therefore, a tool for removing the middle sleeve of the guide vane of a hydro-turbine generator set without lifting the crank arm is designed. It is used to remove the guide vane middle sleeve before the crank arm is lifted out, so that the middle sleeve can be removed in advance to avoid the removal of the middle sleeve occupying the linear construction period. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a tool for disassembling the guide vane middle shaft sleeve of a hydro-turbine generator set without lifting a crank arm. Under the condition that the crank arm and the upper shaft sleeve are not lifted, the guide vane middle shaft sleeve can be disassembled in advance, so as to avoid the guide vane middle shaft sleeve disassembly occupying the linear construction period.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a tool for removing the guide vane middle shaft sleeve of a hydro-turbine generator set without a lifting arm, comprising two groups of semicircular rings, the two groups of semicircular rings forming an adapter ring, the semicircular ring is provided with a through hole corresponding to the mounting hole of the middle shaft sleeve sealing pressure plate on the guide vane middle shaft sleeve, the bolt is installed in the mounting hole of the middle shaft sleeve sealing pressure plate on the guide vane middle shaft sleeve after passing through the through hole, the semicircular ring is provided with a plurality of threaded holes matching with the top screw, the dividing circle of the threaded holes is arranged above the mounting base of the top cover, the top screw is arranged on the upper side of the mounting base of the top cover, and the top screw is turned by a wrench to drive the guide vane middle shaft sleeve to move upward.

[0007] In a preferred solution, a cushion block is provided between the top screw and the mounting base of the top cover.

[0008] In a preferred embodiment, the wrench is an electric wrench.

[0009] In a preferred solution, one end of the semicircular ring is provided with a protrusion, and the other end is provided with a groove, and the protrusion of the semicircular ring cooperates with the groove of another group of semicircular rings.

[0010] In a preferred solution, a connecting through hole is provided on the protrusion, a connecting screw hole is provided on the groove, and a connecting bolt passes through the connecting through hole and the connecting screw hole to connect the two groups of semicircular rings.

[0011] In a preferred solution, a circular arc protrusion is provided at the lower end of the top screw.

[0012] The utility model provides a tool for removing the guide vane middle sleeve of a hydro-turbine generator set without a lifting arm, which has the following beneficial effects:

[0013] 1. This tool can remove the guide vane middle sleeve in advance without lifting the crank arm and the upper sleeve, avoiding the disassembly of the middle sleeve occupying the linear construction period.

[0014] 2. This tool can be used to evenly distribute the force applied to the guide vane center sleeve during disassembly to a whole circle of pressure plate bolt holes, thereby optimizing the force and avoiding damage to the pressure plate bolt holes.

[0015] 3. The tool can generate a large lifting force and can be used to remove the center shaft sleeve that is severely corroded. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 This is the position relationship diagram of each component in the maintenance area;

[0018] Figure 2 This is a schematic diagram of the overall installation structure of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the adapter ring;

[0020] Figure 4 for Figure 3 Sectional view along the AA plane;

[0021] Figure 5 Schematic diagram of the structure of the top wire;

[0022] In the figure: semicircular ring 1, bolt 2, top screw 3, wrench 4, spacer 5, guide vane middle sleeve 6, top cover 7, movable guide vane 8, middle sleeve sealing pressure plate 9, guide vane upper sleeve 10, crank arm 11, through hole 101, threaded hole 102, protrusion 103, groove 104, connecting through hole 105, connecting screw hole 106, connecting bolt 107, arc protrusion 301, and mounting base 701. DETAILED DESCRIPTION

[0023] like Figures 2~5 As shown, a tool for removing the guide vane shaft sleeve of a hydro-turbine generator set without a lifting arm comprises two groups of semicircular rings 1, which form an adapter ring with a hollow circular ring structure, and are mainly used to transfer the bearing point of the guide vane shaft sleeve 6 to the adapter ring 1. The outer diameter of the adapter ring is preferably close to the outer diameter of the mounting base 701 of the top cover 7, and the inner diameter is larger than the outer diameter of the guide vane shaft neck, so that it can be sleeved on the outer side of the guide vane shaft neck. The semicircular ring 1 is provided with a through hole 101 corresponding to the mounting hole of the shaft sleeve sealing pressure plate on the guide vane shaft sleeve 6. The bolt 2 passes through the through hole 101 and is installed in the mounting hole of the shaft sleeve sealing pressure plate on the guide vane shaft sleeve 6 to fix the semicircular ring 1 on the guide vane shaft sleeve 6. The semicircular ring 1 is provided with a plurality of threaded holes 102 that cooperate with the top screw 3. The number of the threaded holes 102 is an even number. The dividing circle of the threaded holes 102 is arranged above the mounting base 701 of the top cover 7. The top screw 3 is arranged on the upper side of the mounting base 701 of the top cover 7. The top screw 3 is screwed by the wrench 4 so that the adapter ring drives the guide vane middle shaft sleeve 6 to move upward. The length of the top screw 3 is greater than the length of the guide vane middle shaft sleeve 6. The wrench 4 is an electric wrench, and a rechargeable or plug-in electric wrench can be selected.

[0024] The top screw 3 is driven to rotate by the wrench 4, and the lower end of the top screw 3 is pressed tightly against the upper side of the mounting base 701 and cannot move further. Since the top screw 3 is threadedly connected to the adapter ring, the top screw 3 rotates, causing the adapter ring and the guide vane middle shaft sleeve 6 to move upward synchronously, and the guide vane middle shaft sleeve 6 is pushed out.

[0025] Preferably, a cushion block 5 is provided between the top screw 3 and the mounting base 701 of the top cover 7. The cushion block 5 is a rectangular iron plate. By providing the cushion block 5, the mounting base 701 of the top cover 7 is protected, and damage to the mounting base 701 can be reduced.

[0026] Preferably, Figure 4As shown, one end of the semicircular ring 1 is provided with a protrusion 103, and the other end is provided with a groove 104. The protrusion 103 of the semicircular ring 1 cooperates with the groove 104 of another group of semicircular rings 1. The two groups of semicircular rings 1 are assembled together by the mutual engagement of the protrusion 103 and the groove 104.

[0027] Furthermore, the protrusion 103 is provided with a connecting through hole 105, the groove 104 is provided with a connecting screw hole 106, and the connecting bolt 107 passes through the connecting through hole 105 and the connecting screw hole 106 to connect the two groups of semicircular rings 1 so that the two groups of semicircular rings 1 form a whole to enhance the force.

[0028] Preferably, Figure 5 As shown, a circular arc protrusion 301 is provided at the lower end of the top screw 3 to reduce the rotation resistance of the top screw 3.

[0029] Implementation method 1:

[0030] Construction preparation: The middle shaft sleeve sealing pressure plate 9 has been removed and hung on the top cover 7 with wire, etc., which will not affect the operation; the middle shaft sleeve seal has been taken out; the connecting bolts of the guide vane middle shaft sleeve 6 and the top cover 7 have been removed.

[0031] S1: Clean the upper end surface of the guide vane middle shaft sleeve 6 to remove foreign matter, and place two sets of semicircular rings 1 on the upper side of the guide vane middle shaft sleeve 6;

[0032] S2: Use the connecting bolts 107 to connect the two sets of semicircular rings 1 into a whole to form an adapter ring to enhance the force;

[0033] S3: fine-tune the adapter ring so that its through hole 101 is aligned with the sealing pressure plate mounting hole on the guide vane middle shaft sleeve 6, and use bolts 2 to install the adapter ring on the guide vane middle shaft sleeve 6;

[0034] S4: Screw the two top screws 3 symmetrically into the threaded holes 102. It is preferred to use the threaded holes 102 away from the splicing surface of the semicircular ring 1;

[0035] S5: Place the spacer 5 directly under the top screw 3 and screw the top screw 3 to the bottom;

[0036] S6: Use two wrenches 4 symmetrically to continuously push down the top screw 3, so that the top screw 3 pushes up the adapter ring together with the guide vane middle shaft sleeve 6, until the guide vane middle shaft sleeve 6 is completely pushed out of the mounting base 701;

[0037] S7: Use a wooden block to support the lower part of the guide vane middle shaft sleeve 6, and use two long screw rods with the same diameter as the middle shaft sleeve installation bottom hole to fix the guide vane middle shaft sleeve 6 so that it does not fall into the installation hole and is convenient for subsequent lifting together with the top cover 7;

[0038] S8: Remove the top screw 3, adapter ring, etc. The disassembly of the sleeve in this group is completed and transfer to the next group of operations.

[0039] Implementation method 2:

[0040] If the two jackscrews 3 cannot loosen the guide vane middle shaft sleeve 6, jackscrews 3 can be installed on other threaded holes 102 and tightened with an electric wrench to increase the lifting force. Tighten repeatedly until the guide vane middle shaft sleeve 6 is loosened, and then use two symmetrical jackscrews to perform S6-S8.

[0041] The tool can remove the guide vane center sleeve in advance without lifting the crank arm and the upper sleeve, avoiding the center sleeve removal occupying the linear construction period. The tool can evenly distribute the force on the guide vane center sleeve during removal to a whole circle of the pressure plate bolt holes, optimize the force, and avoid straining the pressure plate bolt holes. The tool can generate a large lifting force and can be used to remove the center sleeve that is severely corroded.

Claims

1. A tool for removing the guide vane sleeve of a hydro-turbine generator set without a lifting arm, characterized in that: The invention comprises two groups of semicircular rings (1), the two groups of semicircular rings (1) form an adapter ring, the semicircular ring (1) is provided with a through hole (101) corresponding to the installation hole of the middle shaft sleeve sealing pressure plate on the guide vane middle shaft sleeve (6), the bolt (2) passes through the through hole (101) and is installed in the installation hole of the middle shaft sleeve sealing pressure plate on the guide vane middle shaft sleeve (6), the semicircular ring (1) is provided with a plurality of threaded holes (102) matched with the top screw (3), the dividing circle of the threaded holes (102) is arranged above the installation base (701) of the top cover (7), the top screw (3) is arranged on the upper side of the installation base (701) of the top cover (7), and the adapter ring drives the guide vane middle shaft sleeve (6) to move upward by screwing the top screw (3) by a wrench (4).

2. A tool for removing the guide vane middle sleeve of a hydro-turbine generator set without a lifting arm according to claim 1, characterized in that: A cushion block (5) is provided between the top screw (3) and the mounting base (701) of the top cover (7).

3. A tool for removing the guide vane middle sleeve of a hydro-turbine generator set without a lifting arm according to claim 1, characterized in that: The wrench (4) is an electric wrench.

4. A tool for removing the guide vane middle sleeve of a hydro-turbine generator set without a lifting arm according to claim 1, characterized in that: One end of the semicircular ring (1) is provided with a protrusion (103), and the other end is provided with a groove (104), and the protrusion (103) of the semicircular ring (1) cooperates with the groove (104) of another set of semicircular rings (1).

5. A tool for removing the guide vane middle sleeve of a hydro-turbine generator set without a lifting arm according to claim 4, characterized in that: The protrusion (103) is provided with a connecting through hole (105), the groove (104) is provided with a connecting screw hole (106), and the connecting bolt (107) passes through the connecting through hole (105) and the connecting screw hole (106) to connect the two groups of semicircular rings (1).

6. A tool for removing the guide vane middle sleeve of a hydro-turbine generator set without a lifting arm according to claim 1, characterized in that: A circular arc protrusion (301) is provided at the lower end of the top screw (3).

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