RU2778953C1 - Tools for lifting and maintenance and repair planetary gear components in the sea water circulation pump of a nuclear power plant - Google Patents

Abstract

FIELD: nuclear-class hydraulic machines.

SUBSTANCE: invention relates to nuclear-class hydraulic machines, in particular to tools for lifting and repairing the pump planetary gear. The tool for lifting and maintenance and repair of planetary gear components in the NPP sea water circulation pump includes one lifting device for balancing the lifted components and one barring device. The upper end of the lifting device is fixed to the lower end of the turning device, and the lower end of the lifting device is connected to the upper flange of the planetary block of the planetary gearbox by means of bolts with the possibility of lifting the rotor part of the planetary gearbox. The turning device and the lifting device are hollow structures through which the splined shaft of the planetary gear passes, and the splined shaft is fixed on the upper end of the turning device.

EFFECT: reduction in the period of maintenance and repair of equipment.

7 cl, 3 dwg

Description

Technical field

This claimed invention relates to the engineering and technical field of maintenance and repair of hydraulic machines, in particular, relates to tools for lifting and maintenance of a planetary gear component in the sea water circulation pump of a nuclear power plant.

State of the art

Nuclear power plant seawater circulating pumps perform the functions of power transmission, speed reduction, torque increase, axial load bearing, and pump slewing direction through the gearbox. Inside the NPP sea water circulation pump, the design of the NGW planetary gearbox with a single-stage herringbone planetary gear with power division into 3 flows is used.

Due to the complex internal structure of the seawater circulating pump and the large mass of individual components, in the maintenance and repair of the seawater circulating pump, the assembly and disassembly of the transmission box is difficult, labor is required to support and adjust the position of the components in large cases, and damage incidents are easy to occur. equipment and injured personnel.

Disclosure of invention

The purpose of this application is to provide tools for lifting and maintenance of the planetary gear components in the nuclear power plant seawater circulation pump, in order to solve the problems associated with difficult disassembly and assembly of the gearbox during the maintenance and repair of the nuclear power plant seawater circulation pump and greater dependence on labor to support and adjust the position of components, which easily causes equipment shock and personnel injury.

Technical solution for realizing the purpose of this application:

In an embodiment of the present application, tools are provided for lifting and maintenance of planetary gear components in a nuclear power plant seawater circulation pump. The specified device includes: a turning device and a lifting device.

The upper end of the lifting device is fixed with the lower end of the shafting device, and the lower end of the lifting device is connected with the upper flange of the planetary block of the planetary box with bolts to carry out the lifting operation of the rotor part of the planetary gearbox.

The turning device and the lifting device are a hollow structure through which the splined shaft of the planetary gear can pass, and the splined shaft is fixed on the upper end of the turning device.

The lifting device has lifting eyes.

As an option, the turning device includes: a turning bracket, a thrust bearing and a carrier plate;

The lower end of the turning bracket is fixed with a lifting device, and on the upper end surface of the turning bracket there is an annular groove for installing a thrust bearing.

The thrust bearing is mounted on the annular groove, and the lower end is in contact with the annular groove.

The carrier plate is mounted on the upper end surface of the thrust bearing and is used to accommodate the splined shaft.

As a possible option

The carrier plate is a two-piece structure.

As a possible choice, the carrier plate includes: the first half ring and the second half ring.

The first half ring and the second half ring are bolted to each other on the carrier plate.

As a possible choice, the lifting device includes a lifting pallet.

The diameter of the lifting pallet is larger than the diameter of the turning arm.

Bolt holes are provided on the upper end of the lifting pan for bolting to the upper flange of the planetary block of the planetary gearbox.

As a possible choice

the number of lifting eyes is 4, which are used to interact with the chain winch and the cross-shaped suspension beam.

Useful technical results of the invention of the present application are as follows:

(1) The tools for lifting and maintenance of the planetary gear components in the seawater circulation pump of the nuclear power plant provided by this embodiment of the present application are simple in structure and convenient to operate; a lifting device is provided that allows you to balance the lifted components and avoid impact and damage to parts and components in tension during their lifting, effectively improve the technology of maintenance and repair of transmission components, increase the efficiency of maintenance and repair of equipment and reduce the total period of maintenance and repair of hydromechanical equipment.

(2) The tools for lifting and maintenance of the planetary gear components in the nuclear power plant seawater circulation pump provided by the embodiment of the present application include a barring device, which can perform the barring check of the planetary unit components and adjust the position of the components during lifting and assembly, reduce the dependency from the labor force during assembly work and reduce the risk of injury to personnel.

Brief description of the attached drawings

1 is a structural diagram of a tool for lifting and maintenance of planetary gear components in a nuclear power plant seawater circulation pump in accordance with the present embodiment of the application;

2 is a structural diagram of a tool for lifting and maintenance of planetary gear components in a nuclear power plant seawater circulation pump according to an embodiment of the application;

Fig. 3 is a diagram of the state of use of the tool for lifting and maintenance of planetary gear components in the sea water circulation pump of a nuclear power plant, provided by an embodiment of this application;

List of positions:

1 - Turning device; 2 - Lifting device; 3 - Bolt; 4 - Splined shaft; 5 - Planetary block; 6 - Gearbox; 7 - Thrust head; 11 - Turning bracket; 111 - Annular groove; 12 - Thrust bearing; 13 - Carrier plate; 131 - First half ring; 132 - Second half ring; 133 - Bolt carrier plate; 21 - Lifting tray, 22 - Lifting eye.

Implementation of the invention

In order for those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only part, but not all, of the embodiments of the present application. Based on the embodiments recorded in the present invention, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present invention.

The inventor of the present application during the research noted that, based on the design features of the planetary gear mechanism of the NGW planetary gearbox, the main difficulties in the process of maintenance and repair of the NPP seawater circulation pump are as follows:

1. When checking the combined bearing units of the gearbox, it is necessary to remove the planetary block and thrust head;

2. To ensure dynamic balance of the planetary block and thrust head, during reassembly, they must be assembled and the parts and assemblies must be installed in the same positions where they were before disassembly. Due to the complex design of the interface of the planetary unit with the thrust head and the gearbox housing, it is very difficult to install back only using an overhead crane and a conventional lifting mechanism;

3. The planetary unit and gearbox housing are splined. Due to the large mass and volume of the body of the planetary unit, the requirements for balancing during the lifting process are relatively high, otherwise it is easy to damage the surface of the teeth.

To resolve issues related to matching and adjusting the position of the gearbox housing and thrust head, as well as the entire lifting and balancing of the rotor part of the gearbox (including the gearbox, thrust head and combined bearing components) when the gearbox planetary block is completely removed, embodiments of the present application provide tools for lifting and maintenance of the planetary gear components in the sea water circulation pump of nuclear power plant, it is a lifting device for balancing the components being lifted, a turning device for adjusting the position of the planetary unit components in the process of inspection, lifting and assembly, which can effectively reduce the dependence on labor during assembly work, reduce the risk of injury to personnel, improve the technology of maintenance and repair of transmission components, increase the efficiency of maintenance and repair of equipment and reduce the total period of maintenance and repair of hydromechanical equipment.

Based on the foregoing, in order to clearly and in detail describe the above advantages of the present application, specific embodiments of the present application will be described below with reference to the accompanying drawings.

See FIGS. 1 and 2 for structural diagrams of tools for lifting and maintenance of planetary gear components in a nuclear power plant seawater circulation pump in accordance with an embodiment of the present application.

The tools for lifting and maintenance of the planetary gear components in the NPP sea water circulation pump, provided by the embodiment of the present application, include: a turning device 1 and a lifting device 2.

The upper end of the lifting device 2 is fixed to the lower end of the turning device 1, and the lower end of the lifting device 2 is connected to the upper flange of the planetary block of the planetary box by means of bolts 3, which is used to lift the rotor part of the planetary gear.

Both turning device 1 and lifting device 2 are hollow structures, so that the splined shaft of the planetary gear passes through them, and the splined shaft is fixed on the upper end of the turning device 1.

The lifting device 2 has lifting eyes.

In the embodiment of the present application, after the lifting device 2 and the input flange of the planetary gearbox unit are firmly connected with bolts 3, the rotor part can be balanced using a chain winch to avoid impact and pitting of the rotor part and gearbox housing spline in the process of moving relative to each other. friend.

It should also be noted that when the components of the planetary unit are to be lifted separately, the turning device 1, the lifting device 2 and the splined shaft must be assembled.

Firmly connect the turning device 1 and lifting device 2 to the input flange of the planetary gear box, while the splined shaft passes through the inner ring of the planetary sun gear. The lifting and balancing of the components of the planetary unit is carried out using a cross-shaped suspension beam and a chain winch.

In some possible realizable embodiments of the present application, due to the large mass of the splined shaft, it is difficult to lift it with human power and rotate the entire planetary unit using the splined shaft. Meanwhile, when assembling the components of the planetary unit and the thrust shaft, it is necessary to set them back to their original position to ensure that their dynamic balance is not affected, so after the planetary unit enters the spline groove of the gearbox housing, it is necessary to bring the turning device of the planetary unit to movement, with the help of transmission through the splined shaft, rotate the components of the planetary gear, ensure the fitting of the components of the planetary gear and the hole for the retainer of the lower thrust head. Those. the turning device 1 may specifically include a turning bracket 11, a thrust bearing 12 and a bearing plate 13.

The lower end of the turning bracket 11 is fixed with the lifting device 2, and on the upper end surface of the turning bracket 11 there is an annular groove 111 for installing the thrust bearing.

The thrust bearing 12 is mounted on the annular groove 111, and the lower end is in contact with the annular groove 111.

The carrier plate 13 is installed on the upper end surface of the thrust bearing 12 to accommodate the splined shaft.

In one example, as shown in FIG. 2, base plate 12 is a two-halves structure. For example, the base plate 12 includes: a first semicircular ring 131 and a second semicircular ring 132; the first semicircular ring 131 and the second semicircular ring 132 are fixed to each other by bolts 133 of the carrier plate. In some possible implementations of the present application, the lifting device 2 includes: a lifting pallet 21.

The diameter of the lifting pallet 21 is greater than the diameter of the turning arm 11.

Bolt holes are provided on the upper end surface of the lifting pallet 21 for connection with the upper flange of the planetary gear unit with bolts 3.

In some possible embodiments of the present application, at least two lugs 22 are additionally provided on the upper end surface of the lifting pallet 21, the two lugs 22 being arranged symmetrically.

For example, there are four eyelets 22 that are used to adapt the chain winch and the cross suspension beam.

It is understood that the lifting pan 2 is connected to the upper flange of the planetary gear unit by bolts 3 and has 4 lifting eyes that can cooperate with the chain winch and the cruciform lifting beam to lift the rotor part of the gearbox.

Below, a specific method of using tools for lifting and maintenance of planetary gear components in a nuclear power plant seawater circulation pump provided by an embodiment of the present application will be described in detail with reference to a specific example.

See Fig. 3, which is a state diagram of the use of a tool for lifting and maintenance of planetary gear components in a nuclear power plant seawater circulating pump provided by an embodiment of the present application.

During the rotation of the shaft, the splined shaft 4 is placed on the bearing plate 13, and through the thrust bearing 12 it is mounted on the turning bracket 11. When turning and rotating the planetary block 5, the turning bracket 11 and the lifting device 2 are connected to the upper flange surface of the planetary block by means of the bolt 3 and gaskets . After lifting the splined shaft 4, the first half ring 131 and the second half ring 132 are installed on both sides of the splined shaft 4 and fixed with bolts 133 of the base plate.

As shown in FIG. 3, after installing the turning device 1 and lifting device 2, the lower end teeth of the spline shaft 4 engage with the internal teeth of the sun gear of the planetary unit 5. By rotating the splined shaft 4, the planetary unit 5 can be flexibly rotated to check for damage and corrosion on the surface of the planetary transmission.

In the process of reassembling the gearbox 6, after the planetary assembly 5 is balanced, using the tools for lifting and maintenance of the planetary gear components in the nuclear power plant seawater circulation pump provided in the embodiment of the present application, lower the planetary assembly 5 into the spline groove of the gearbox housing 6 At this time, there is still a certain gap between the bottom of the planetary block 5 and the lower thrust head 7. Turn the splined shaft 4 to rotate the planetary block 5. Stop turning when the planetary block 5 turns until the thrust head 7 returns to the position where it was before dismantling. Continue lowering the planetary block 5 until it rests on the thrust head 7.

The present invention has been described in detail above with the accompanying figures and exemplary embodiments, but is not limited to the above exemplary embodiments. Various changes are allowed within the scope of knowledge possessed by those skilled in the art without deviating from the main purpose of the present invention. Any content that is not described in detail in this application may use the prior art.

Claims (10)

1. A tool for lifting and maintenance and repair (M&R) of planetary gear components in the NPP sea water circulation pump, characterized in that said tool includes: a turning device and a lifting device, while the upper end of the lifting device is fixed to the lower end of the turning device, and the lower end of the lifting device is connected to the upper flange of the planetary block of the planetary gearbox by means of bolts with the possibility of lifting the rotor part of the planetary gearbox, the turning device and the lifting device are hollow structures through which the splined shaft of the planetary gear passes, and the splined shaft is fixed on the upper end of the turning device, and the lifting device is provided with lifting eyes. 2. The tool according to claim 1, characterized in that said barring device includes a barring bracket, a thrust bearing and a bearing plate, wherein the lower end of the barring bracket is fixed with a lifting device, and on the upper end surface of the barring bracket there is an annular groove for installing a thrust bearing, while the thrust bearing is mounted on the annular groove, and the lower end is in contact with the annular groove, and the bearing plate is mounted on the upper end surface of the thrust bearing and is used to accommodate the splined shaft. 3. The tool according to claim 2, characterized in that the carrier plate is a two-halves structure. 4. The tool according to claim 3, characterized in that the carrier plate includes: a first half ring and a second half ring, the first half ring and the second half ring being bolted to the carrier plate. 5. The tool according to claim 2, characterized in that the lifting device includes a lifting pallet, the diameter of which is greater than the diameter of the turning bracket, while at the upper end of the lifting pallet there are bolt holes for bolting to the upper flange of the planetary block of the planetary gearbox. 6. The tool according to claim 5, characterized in that at least two lugs are additionally provided on the upper end surface of the lifting pallet, the two lugs being arranged symmetrically. 7. The tool according to claim 6, characterized in that the number of said eyes is 4, which are used to interact with the chain winch and the cruciform lifting beam.

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