A method for adjusting the load of a thrust bearing of a rigid support type hydroelectric generator set

Abstract

The present application relates to a kind of rigid support type hydroelectric generating set thrust bearing stress adjustment method, the present application does not use erecting dial indicator to monitor the height of counterweight bolt, but the angle of rotation of counterweight bolt is monitored by dial, the height of counterweight bolt adjustment is obtained by conversion, only the pointer is installed at the end of counterweight bolt needing to carry out stress adjustment, dial is installed on bearing frame, and counterweight bolt is rotated by a certain angle according to target value, inaccurate reading of dial gauge due to vibration is avoided, and inaccurate adjustment is caused, work efficiency is greatly improved, overhaul process is optimized, and overhaul period is saved.

Description

Technical Field

[0001] This invention belongs to the field of hydro-generator installation and maintenance, and specifically relates to a method for adjusting the force on the thrust bearing of a rigid support hydro-generator. Background Technology

[0002] Adjusting the thrust bearing of a hydro-generator unit is a crucial task during installation and maintenance. The thrust bearing bears the weight of the rotating parts of the unit, as well as the axial water thrust during operation. Uneven stress on the thrust bearing can cause uneven wear of the thrust bearing pads, large temperature deviations in the thrust bearing pads, and even increased vibration and runout of the unit, potentially leading to destructive accidents such as thrust bearing burnout, thus affecting the safe and stable operation of the unit.

[0003] According to existing methods, when adjusting the force on a rigid support thrust bearing, a dial indicator is installed at the end of the anti-weight bolt, and the height of the anti-weight bolt is adjusted by tapping it with a small hammer. The adjustment height of the anti-weight bolt is measured by the reading of the dial indicator. However, when the anti-weight bolt is tapped with a small hammer, the dial indicator will have inaccurate readings due to the vibration generated by the tapping, resulting in inaccurate adjustment data. Over-adjustment or under-adjustment often occurs, and multiple adjustments are often required to achieve the desired effect, resulting in low work efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for adjusting the force on the thrust bearing of a rigid strut hydro-generator unit, which adjusts the force on the thrust bearing of the rigid strut hydro-generator unit by measuring the angle using a dial.

[0005] This invention is achieved through the following technical solutions:

[0006] A method for adjusting the force on the thrust bearing of a rigid-support type hydro-generator unit includes the following steps:

[0007] Step (1) Use the top rotor oil pump to lift the entire rotating part of the unit, so that the weight of the unit is transferred to the brake, and engage the brake lock.

[0008] Step (2) Measure and record the force on the thrust bearing when the rotor is lifted; Step (3) Release the brake lock and operate the rotor oil pump to transfer the weight of the rotating part of the unit to the thrust bearing.

[0009] Step (4) Measure and record the force value of the thrust bearing when the rotor falls; Step (5) Subtract the force value of the thrust bearing when the rotor is lifted from the force value of the thrust bearing when the rotor falls to obtain the force value of each thrust bearing.

[0010] Step (6) Based on the data, the thrust bearing that needs to be adjusted for force can be determined, and the adjustment value can be determined based on experience;

[0011] Step (7) Remove the anti-weight bolt locking plate of the thrust bearing that needs to be adjusted;

[0012] Step (8) Install the dial on the load-bearing frame, and install the pointer on the end of the anti-weight bolt; Step (9) Calculate the angle to be adjusted according to the required height, and the calculation method is as follows:

[0013]

[0014] P - Pitch of the anti-weight bolt; A - Angle to be adjusted; σ - Height to be adjusted; The pitch of the anti-weight bolt and the height to be adjusted are known quantities.

[0015] Step (10) Rotate the anti-weight bolt in the direction of the expected adjustment value, observe the angle indicated by the pointer on the dial, and stop when the calculated value is reached;

[0016] Step (11) Remove the pointer and dial, and reinstall the locking plate at the end of the anti-weight bolt;

[0017] Step (12) After the rotor falls, measure the force data of each thrust bearing and subtract the force data of the thrust bearing when the rotor is lifted. This is the force value of the thrust bearing after one adjustment.

[0018] Furthermore, step (6) also includes repeating step (1) again to lift the rotor so that the weight of the rotating part is transferred to the brake.

[0019] Further, in step (10), the wrench is placed on the end of the anti-weight bolt, and the wrench is gently tapped with a small hammer to rotate the anti-weight bolt in the direction of the expected adjustment value. The angle indicated by the pointer on the dial is observed, and the tapping is stopped after the calculated value is reached.

[0020] Furthermore, after step (11), step (3) is repeated to remove the brake lock, depressurize the brake, and transfer the weight of the rotating part of the unit to the thrust bearing.

[0021] Furthermore, step (12) also includes: if the adjustment fails once, repeat the above steps until the force is acceptable.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] Thrust bearing load adjustment is a crucial aspect of unit installation and maintenance. Existing methods for adjusting the load on rigid support thrust bearings involve using a dial indicator to monitor the height of the anti-weight bolt, followed by tapping it with a small hammer to rotate it. This invention eliminates the need for a dial indicator; instead, it uses a scale to monitor the bolt's rotation angle and calculates the adjustment height. Simply install a pointer on the bolt end requiring adjustment, attach a safety scale to the load-bearing frame, and rotate the bolt a specific angle according to the target value. This avoids inaccurate adjustments due to inaccurate dial indicator readings caused by vibration, significantly improving work efficiency, optimizing maintenance processes, and saving maintenance time. Detailed Implementation

[0024] The technical solutions in this embodiment will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some examples of the present invention, and not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] This embodiment describes a method for adjusting the force on the thrust bearing of a rigid strut hydro-generator unit. The method adjusts the force on the thrust bearing by measuring angles using a dial, and includes the following steps:

[0027] Step A: Use the top rotor oil pump to lift the entire rotating part of the unit, so that the weight of the unit is transferred to the brake, and engage the brake locking mechanism.

[0028] Step B: Measure and record the force on the thrust bearing when the rotor is lifted.

[0029] Step C: Release the brake lock and operate the top rotor oil pump to transfer the weight of the rotating part of the unit to the thrust bearing.

[0030] Step D: Measure and record the force on the thrust bearing when the rotor falls.

[0031] Step E: Subtract the force value of the thrust pad when the rotor is lifted from the force value of the thrust pad when the rotor is falling to obtain the force value of each thrust pad.

[0032] Step F: Based on the data, the thrust bearing that needs to be adjusted for force can be determined, and the adjustment value can be determined based on experience.

[0033] Step G: Repeat step A again to lift the rotor, so that the weight of the rotating part is transferred to the brake.

[0034] Step H: Remove the anti-weight bolt locking plate of the thrust bearing that needs to be adjusted.

[0035] Step 1: Install the dial on the load-bearing frame and install the pointer on the end of the anti-weight bolt.

[0036] Step J: Calculate the required adjustment angle based on the height needed. The calculation method is as follows:

[0037]

[0038] P - Pitch of the anti-weight bolt; A - Angle to be adjusted; σ - Height to be adjusted; The pitch of the anti-weight bolt and the height to be adjusted are known quantities, and the angle to be adjusted can be obtained by calculation.

[0039] Step K: Rotate the anti-weight bolt in the direction of the expected adjustment value, observe the angle indicated by the pointer on the dial, and stop tapping after reaching the calculated value.

[0040] Step L: Remove the pointer and dial, and reinstall the locking plate at the end of the anti-weight bolt.

[0041] Step M, repeat step C, disengage the brake lock, depressurize the brake, and transfer the weight of the rotating part of the unit to the thrust bearing.

[0042] Step N: After the rotor is lowered, measure the force data of each thrust bearing and subtract the force data of the thrust bearing when the rotor is lifted. This is the force value of the thrust bearing after one adjustment.

[0043] Example 2

[0044] This embodiment describes a method for adjusting the force on the thrust bearing of a rigid strut hydro-generator unit. The method adjusts the force on the thrust bearing by measuring angles using a dial, and includes the following steps:

[0045] Step A: Use the top rotor oil pump to lift the entire rotating part of the unit, so that the weight of the unit is transferred to the brake, and engage the brake locking mechanism.

[0046] Step B: Measure and record the force on the thrust bearing when the rotor is lifted.

[0047] Step C: Release the brake lock and operate the top rotor oil pump to transfer the weight of the rotating part of the unit to the thrust bearing.

[0048] Step D: Measure and record the force on the thrust bearing when the rotor falls.

[0049] Step E: Subtract the force value of the thrust pad when the rotor is lifted from the force value of the thrust pad when the rotor is falling to obtain the force value of each thrust pad.

[0050] Step F: Based on the data, the thrust bearing that needs to be adjusted for force can be determined, and the adjustment value can be determined based on experience.

[0051] Step G: Repeat step A again to lift the rotor, so that the weight of the rotating part is transferred to the brake.

[0052] Step H: Remove the anti-weight bolt locking plate of the thrust bearing that needs to be adjusted.

[0053] Step 1: Install the dial on the load-bearing frame and install the pointer on the end of the anti-weight bolt.

[0054] Step J: Calculate the required adjustment angle based on the height needed. The calculation method is as follows:

[0055]

[0056] P - Pitch of the anti-weight bolt; A - Angle to be adjusted; σ - Height to be adjusted; The pitch of the anti-weight bolt and the height to be adjusted are known quantities, and the angle to be adjusted can be obtained by calculation.

[0057] Step K: Place the wrench on the end of the anti-weight bolt and gently tap the wrench with a small hammer to rotate the anti-weight bolt in the direction of the expected adjustment value (increasing the force is counterclockwise when viewed from above, and decreasing the force is clockwise when viewed from above). Observe the angle indicated by the pointer on the dial. Stop tapping after reaching the calculated value.

[0058] Step L: Remove the pointer and dial, and reinstall the locking plate at the end of the anti-weight bolt.

[0059] Step M, repeat step C, disengage the brake lock, depressurize the brake, and transfer the weight of the rotating part of the unit to the thrust bearing.

[0060] Step N: After the rotor is lowered, measure the force data of each thrust bearing and subtract the force data of the thrust bearing when the rotor is lifted. This is the force value of the thrust bearing after one adjustment.

[0061] Step 0: If the adjustment fails the first time, repeat the above steps until the stress condition is met.

[0062] As a specific example, based on the method of the above embodiments, for a certain hydro-generator unit, the thrust bearing force adjustment during maintenance is carried out using the following specific steps:

[0063] Step (1) Use a thrust force measuring instrument to measure and record the current force on the thrust bearing. The data is shown in Table 1 below:

[0064] Table 1

[0065]

[0066]

[0067] Step (2) Based on the measurement data, it can be seen that the force on thrust bearing No. 18 is too small. Based on the empirical value, the height of the anti-weight bolt of the thrust bearing should be adjusted as shown in Table 2 below:

[0068] Table 2

[0069]

[0070] Step (3) Based on the required adjustment height, calculate the angle by which the anti-weight bolt should be rotated using the formula from step E, as shown in Table 3 below:

[0071] Table 3

[0072]

[0073] Step (4) Use the top rotor oil pump to lift the rotating part of the unit by 8-10mm until the thrust bearing separates from the mirror plate, transfer the weight of the unit to the brake, and engage the brake lock.

[0074] Step (5) Based on the calculated rotation angle, install pointers on the ends of the anti-weight bolts that need to be adjusted in sequence, install a scale on the load-bearing frame, rotate the anti-weight bolts to the target angle, and after the adjustment is completed, use a thrust force measuring instrument to measure the force value of each thrust bearing in the rotor jacking state and record it. The data is shown in Table 4 below.

[0075] Step (6) Release the brake lock, release the brake oil pressure, transfer the weight of the rotating part of the unit to the thrust bearing, and measure the force on each thrust bearing again. The data are shown in Table 4 below:

[0076] Table 4

[0077]

[0078] It can be seen that after one adjustment, the force difference of each thrust bearing is basically the same, within 0.02mm, achieving the expected goal.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for adjusting the force on the thrust bearing of a rigid support-type hydro-generator unit, characterized in that: Includes the following steps: Step (1) Use the top rotor oil pump to lift the entire rotating part of the unit, so that the weight of the unit is transferred to the brake, and engage the brake lock. Step (2) Measure and record the force on the thrust bearing when the rotor is lifted. Step (3) Release the brake lock and operate the top rotor oil pump to transfer the weight of the rotating part of the unit to the thrust bearing; Step (4) Measure and record the force on the thrust bearing when the rotor falls. Step (5) Subtract the force value of the thrust pad when the rotor is lifted from the force value of the thrust pad when the rotor is falling to obtain the force value of each thrust pad; Step (6) Based on the data, the thrust bearing that needs to be adjusted for force can be determined, and the adjustment value can be determined based on experience; Step (7) Remove the anti-weight bolt locking plate of the thrust bearing that needs to be adjusted; Step (8) Install the dial on the load-bearing frame and install the pointer on the end of the anti-weight bolt; Step (9) Calculate the angle that needs to be adjusted based on the required height. The calculation method is as follows: ； In the formula: P - pitch of the anti-weight bolt; A - angle to be adjusted; σ - height to be adjusted; the pitch of the anti-weight bolt and the height to be adjusted are known quantities; Step (10) Rotate the anti-weight bolt in the direction of the expected adjustment value, observe the angle indicated by the pointer on the dial, and stop when the calculated value is reached; Step (11) Remove the pointer and dial, and reinstall the locking plate at the end of the anti-weight bolt; Step (12) After the rotor falls, measure the force data of each thrust bearing and subtract the force data of the thrust bearing when the rotor is lifted. This is the force value of the thrust bearing after one adjustment.

2. The method according to claim 1, characterized in that: Step (6) also includes repeating step (1) again to lift the rotor so that the weight of the rotating part is transferred to the brake.

3. The method according to claim 1, characterized in that: In step (10), place the wrench on the end of the anti-weight bolt and gently tap the wrench with a small hammer to rotate the anti-weight bolt in the direction of the expected adjustment value. Observe the angle indicated by the pointer on the dial and stop tapping after reaching the calculated value.

4. The method according to claim 1, characterized in that: Step (11) is followed by Repeat step (3) to remove the brake lock, depressurize the brake, and transfer the weight of the rotating part of the unit to the thrust bearing.

5. The method according to claim 1, characterized in that: Step (12) also includes: if the adjustment fails once, repeat the above steps until the stress is acceptable.

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