Overhaul hanging bracket for lower bearing bush of steam turbine bearing

Abstract

A steam turbine bearing lower bearing bush maintenance hanging bracket comprises a hanging bracket body capable of being erected on a lower bearing box of a steam turbine in a crossing mode, and is characterized in that a horizontally-fixed fixed hanging beam and a rotary hanging arm capable of horizontally rotating on the hanging bracket body are installed on the hanging bracket body, and a connecting bottom plate capable of being fixedly connected with the lower bearing box is arranged at the bottom of the hanging bracket body. The lifting frame can be fixedly erected on the lower bearing box, supporting is stable and reliable, the safety of lower bearing bush overhauling is improved, the fixed lifting beam serves as a supporting beam for vertically lifting the lower bearing bush, the rotary lifting arm serves as a supporting beam for vertically lifting the lower bearing bush and horizontally moving the lower bearing bush, and the lifting requirements of all overhauling operations of the lower bearing bush are met; safety and efficiency of maintenance operation of the lower bearing bush are improved, a crane does not need to be occupied, and crane operation during steam turbine maintenance is reduced.

Description

Technical Field

[0001] The utility model relates to a steam turbine bearing lower bushing maintenance hanger, belonging to the technical field of steam turbine maintenance. Background Art

[0002] In recent years, cylinder bearings have been widely used in low-pressure exhaust cylinders of large steam turbine generator sets. Such units have compact structures and shorter shaft lengths than units using floor-standing bearings, which can save plant space. Cylinder bearings are formed by the butt joint of upper and lower bearing shells and are installed in the diffuser cavity of the low-pressure cylinder. The rotor gravity and vacuum loads are transmitted to the cylinder housing through the bearing box, and then transmitted to the foundation by the lower skirt support. They are important load-bearing components. During the operation of large steam turbine generator sets, the cylinder-type bearings have many problems such as bearing seat deformation, bearing shell eccentricity, insufficient bearing shell self-positioning ability, high shell surface temperature, and large deviation of shell temperature measurement points. The steam turbine bearings need to be inspected and maintained. Conventional steam turbine bearing inspection uses the crane in the factory to lift the upper and lower bearing shells, then increase or decrease the pads and shims, check the contact between the bearing pillow and the pad, grind according to the high contact point, and also scrape and adjust the black gold surface of the bearing shell. All of the above work requires repeated use of the crane for lifting operations, especially during the overhaul of the unit, when lifting operations are frequent and the crane usage window is tight. In order to solve the problem of tight crane use window, some adopt scaffolding to lift the bearing, but there are safety risks such as unstable support points and easy collapse of scaffolding, and the bearing can only be lifted vertically to complete a simple check of the contact surface between the pad and the bearing pillow, and the bearing cannot be moved parallel to the outside of the bearing box for operation. Parallel movement still requires the use of the crane. If parallel movement is not performed, the metal debris from the grinding of the bearing pad contact surface and the scraping of the bearing during maintenance will directly fall into the bearing box and contaminate the working surface. Utility Model Content

[0003] The utility model provides a maintenance hanger for the lower bearing shell of a steam turbine bearing. The hanger can be fixedly mounted on the lower bearing box, and the support is stable and reliable, thereby improving the safety of the maintenance of the lower bearing shell. A fixed hanging beam is used as a support beam for vertically lifting the lower bearing shell, and a rotating hanging arm is used as a support beam for vertically lifting and horizontally moving the lower bearing shell, thereby meeting the lifting requirements of various maintenance operations of the lower bearing shell, improving the safety and efficiency of the maintenance operations of the lower bearing shell, and eliminating the need to occupy a crane, thereby reducing crane operations during turbine maintenance.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The invention relates to a hanger for inspecting and repairing the lower bearing shell of a steam turbine, comprising a hanger which can be erected across the lower bearing box of the steam turbine, and is characterized in that: the hanger is provided with a horizontally fixed hanging beam and a swivel hanging arm which can be horizontally rotated on the hanger, and the bottom of the hanger has a connecting base plate which can be fixedly connected to the lower bearing box.

[0006] Preferably, the fixed hanger is an I-beam horizontally welded to the top of the hanger, and the fixed hanging beam extends forward from the middle hanger.

[0007] Preferably, the hanger has four columns arranged vertically and distributed in a rectangular shape, one end of the swivel arm is rotatably mounted on the column on the front side of the hanger through a bearing, and the column has a positioning convex ring that abuts against the lower end surface of the bearing.

[0008] Preferably, the swivel arm is an I-beam welded on a bearing, and the length of the swivel arm is smaller than the spacing between the left and right ends of the front side of the hanger, so that the swivel arm can be rotated into the hanger from the front side of the hanger.

[0009] Preferably, the free end of the swivel arm has a latch barrel, and the hanger has a chain latch corresponding to the latch barrel.

[0010] Preferably, the cathead crane is installed on both the fixed hanging beam and the rotating hanging arm in a rolling cooperation manner.

[0011] The beneficial effects of the utility model are:

[0012] The utility model of the steam turbine bearing lower bearing shell inspection hanger is used to first open the upper bearing box and the upper bearing shell of the steam turbine, then the automobile engine bearing box bearing shell inspection hanger is erected across the lower bearing box, and the connecting bottom plate at the bottom of the hanger is fixed to the lower bearing box so that the hanger is fixed to the lower bearing box. When the lower bearing shell needs to be vertically lifted, a chain hoist is installed on the fixed hanging beam, the chain hoist is connected to the lower bearing shell, and the lower bearing shell is vertically lifted by the movement of the chain hoist, so that corresponding maintenance work can be performed on the lower bearing shell gasket; when the lower bearing shell needs to be moved parallel, a chain hoist is installed on the rotating hanging arm, the chain hoist is connected to the lower bearing shell shaft, and the lower bearing shell gasket is lifted vertically by the movement of the chain hoist. The lower bearing is vertically lifted to the top of the lower bearing box, and then the rotary lifting arm is rotated to turn the lower bearing out of the hanger and staggered with the lower bearing box. After that, the lower bearing shaft is subjected to maintenance operations such as grinding and scraping to prevent metal chips generated by the grinding and scraping operations from falling into the lower bearing box and contaminating the working surface. The hanger can be fixedly mounted on the lower bearing box, and the support is stable and reliable, which improves the safety of the maintenance of the lower bearing. The fixed lifting beam is used as the support beam for the vertical lifting of the lower bearing, and the rotary lifting arm is used as the support beam for the vertical lifting and horizontal movement of the lower bearing, which meets the lifting requirements of various maintenance operations of the lower bearing, improves the safety and efficiency of the maintenance operations of the lower bearing, does not need to occupy the crane, and reduces the crane operations during the maintenance of the turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the maintenance hanger of the lower bearing shell of the turbine bearing in a specific implementation manner.

[0014] Figure 2 This is a top view of the turbine bearing lower bearing maintenance hanger.

[0015] Figure 3 Front view of the inspection hanger for the lower bearing shell of the turbine bearing when the cathead crane is installed on the fixed lifting beam and the rotating lifting arm.

[0016] Figure 4 This is a schematic diagram of the automobile engine bearing box bearing shell inspection hanger installed across the lower bearing box. DETAILED DESCRIPTION

[0017] Combine the following Figures 1 to 4 The embodiments of the utility model are described in detail.

[0018] The maintenance hanger for the lower bearing shell of a steam turbine bearing comprises a hanger 1 which can be erected across the lower bearing box of the steam turbine, and is characterized in that: the hanger 1 is provided with a horizontally fixed hanging beam 2 and a swivel hanging arm 3 which can be horizontally rotated on the hanger, and the bottom of the hanger 1 has a connecting base plate 4 which can be fixedly connected to the lower bearing box.

[0019] When using the above-mentioned steam turbine bearing lower bearing shell inspection hanger, first open the upper bearing box and upper bearing shell of the steam turbine, then cross-erect the automobile engine bearing box bearing shell inspection hanger on the lower bearing box 100, and fix the connecting base plate 4 at the bottom of the hanger 1 to the lower bearing box so that the hanger is fixed on the lower bearing box 100. When it is only necessary to vertically lift the lower bearing shell, install a chain hoist on the fixed hanging beam 2, connect the chain hoist to the lower bearing shell, and lift the lower bearing shell vertically through the movement of the chain hoist, so as to perform corresponding maintenance operations on the lower bearing shell gasket; when it is necessary to move the lower bearing shell in parallel, install a chain hoist on the rotating hanging arm 3, connect the chain hoist to the lower bearing shell shaft, and move the chain hoist to move the lower bearing shell gasket. The lower bearing shell is lifted vertically to the top of the lower bearing box, and then the rotary lifting arm 3 is rotated to rotate the lower bearing shell out of the hanger and staggered with the lower bearing box. Then, the lower bearing shell shaft is subjected to maintenance operations such as grinding and scraping to prevent metal chips generated by the grinding and scraping operations from falling into the lower bearing box and contaminating the working surface. The hanger 1 can be fixedly mounted on the lower bearing box, and the support is stable and reliable, which improves the safety of the maintenance of the lower bearing shell. The fixed lifting beam 2 is used as the support beam for vertically lifting the lower bearing shell, and the rotary lifting arm 3 is used as the support beam for vertically lifting and horizontally moving the lower bearing shell, which meets the lifting requirements of various maintenance operations of the lower bearing shell, improves the safety and efficiency of the maintenance operations of the lower bearing shell, does not need to occupy the driving crane, and reduces the driving crane operations during the maintenance of the steam turbine.

[0020] The fixed hanger 2 is an I-beam welded horizontally on the top of the hanger, and the fixed hanger beam 2 extends forward from the middle hanger 1. A cathead crane can be mounted on the I-beam, and a chain hoist is installed on the cathead crane. The cathead crane can move and position on the I-beam, driving the chain hoist to move and adjust the position on the fixed hanger 2. The fixed hanger 2 extends forward to meet the hoisting requirements of different lifting positions of the lower bearing.

[0021] The hanger 1 has four columns 5 arranged vertically and distributed in a rectangular shape. One end of the swing arm 3 is rotatably mounted on the column 5 at the front side of the hanger 1 through a bearing 6, and the column 5 has a positioning protrusion 51 that abuts against the lower end surface of the bearing 6. The hanger 1 has four columns 5 distributed in a rectangular shape. In order to meet the rotation requirements of the swing arm 3, the main column assembled with the bearing 6 is set as a circular main column, and a positioning protrusion 51 for positioning and carrying the bearing 6 is set on the main column. The swing arm 3 is connected to the bearing 6, and the bearing 6 acts as the center of the circle. The swing arm 3 is used as a radius to rotate horizontally on the hanger 1, so that the lower bearing shell suspended just above the lower bearing box 100 can be rotated out of the hanger 1 and vertically staggered with the lower bearing box.

[0022] Among them, the rotating arm 3 is an I-beam welded on the bearing, and the length of the rotating arm 3 is less than the distance between the left and right ends of the columns 5 on the front side of the hanger, so that the rotating arm 3 can be rotated from the front side of the hanger 1 into the hanger 1. The rotating arm 4 is an I-beam, and can also be equipped with a cathead crane, which can be moved and positioned on the I-beam, making it convenient for the chain hoist to move and adjust the position on the rotating arm 3. The length of the rotating arm 3 is less than the distance between the two columns 51 on the front side of the hanger 1. The rotating arm 3 can rotate in and out of the hanger 1, which can drive the rotating arm 3 to move horizontally in and out of the hanger.

[0023] The free end of the swing arm 3 is provided with a latch barrel 7, and the hanger is provided with a chain latch 8 corresponding to the latch barrel 7. When the swing arm 3 is not in use, the chain latch 8 is inserted into the latch barrel 7 to limit the rotation of the swing arm 3, so as to prevent the swing arm 3 from rotating at will and accidentally injuring the operator when not in use. When in use, the chain latch 8 is taken out of the latch barrel 7 to cancel the rotation restriction of the swing arm 3.

[0024] Among them, the cathead crane 9 is installed on the fixed hanging beam 2 and the rotating hanging arm 3 in a rolling manner. The cathead crane 9 can roll and position on the fixed hanging beam and the rotating hanging arm 3, and the chain hoist is conveniently connected to the cathead crane 9. The cathead crane 9 drives the chain hoist to move and adjust its displacement on the fixed hanging beam 2 and the rotating hanging arm 3, thereby improving the convenience of lifting the lower bearing.

[0025] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. A steam turbine bearing lower bearing shell inspection hanger, comprising a hanger that can be erected across the lower bearing box of the steam turbine, characterized in that: The hanger is provided with a horizontally fixed hanging beam and a swivel hanging arm which can be horizontally rotated on the hanger, and the bottom of the hanger is provided with a connecting bottom plate which can be fixedly connected with the lower bearing box.

2. The steam turbine bearing lower bearing shell inspection hanger according to claim 1, characterized in that: The fixed hanging beam is an I-beam horizontally welded on the top of the hanger, and the fixed hanging beam extends forward from the middle hanger.

3. The steam turbine bearing lower bearing shell inspection hanger according to claim 1, characterized in that: The hanger has four vertically arranged and rectangularly distributed columns. One end of the rotary arm is rotatably mounted on the column at the front side of the hanger through a bearing, and the column has a positioning convex ring that abuts against the lower end surface of the bearing.

4. The steam turbine bearing lower bearing shell inspection hanger according to claim 2, characterized in that: The swivel arm is an I-beam welded on a bearing, and the length of the swivel arm is smaller than the distance between the left and right ends of the front side of the hanger, so that the swivel arm can be rotated into the hanger from the front side of the hanger.

5. The steam turbine bearing lower bearing shell inspection hanger according to claim 4, characterized in that: The free end of the rotary suspension arm is provided with a latch barrel, and the suspension bracket is provided with a chain latch corresponding to the suspension latch barrel.

6. The steam turbine bearing lower bearing shell inspection hanger according to claim 4, characterized in that: The cathead crane is installed on the fixed hanging beam and the rotating hanging arm in a rolling cooperation manner.

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