CN111375934A

CN111375934A - Automatic surfacing device for repairing guide vane of water turbine

Info

Publication number: CN111375934A
Application number: CN201811650242.XA
Authority: CN
Inventors: 曾海峰; 王有伟; 张立新; 杨茂新; 李奇隽; 李明翰; 张文亚
Original assignee: Shihezi University
Current assignee: Shihezi University
Priority date: 2018-12-31
Filing date: 2018-12-31
Publication date: 2020-07-07

Abstract

The invention discloses an automatic surfacing device for repairing a guide vane of a water turbine, which comprises a control cabinet, a rotating chuck, a clamping tailstock, the guide vane of the water turbine, a welding gun, a speed reducing motor, an XYZ stepping motor linear analog-digital assembly, a guide rail and a rack. Different welding modes can be selected, the speed reduction motor is controlled to rotate through the PLC, the stepping motor is controlled to enable the welding gun to flexibly move in space, and welding of the guide vane shaft and the guide vane blade of the water turbine is completed. The welding efficiency is improved, and the problems that manual surfacing repair is high in labor intensity, surfacing quality is difficult to guarantee and the like are solved.

Description

Automatic surfacing device for repairing guide vane of water turbine

Technical Field

The invention relates to the fields of hydroelectric power generation, automatic control and remanufacture, in particular to the field of surfacing repair of rotary parts such as guide vanes, valves and the like of water turbines.

Background

The guide vanes are important components of the water turbine, are generally uniformly arranged on the periphery of the rotating wheel, are used for guiding water flow to uniformly flow into the rotating wheel, change the overflow of the water turbine by adjusting the opening of the guide vanes so as to adapt to the requirement of load adjustment change of the generator, and can also play a role of water sealing when the guide vanes are completely closed.

The movable guide vane of the water turbine of the power station runs in a water rich period, and three sections of shaft necks and blades of the guide vane are abraded to different degrees. The guide vane abrasion causes the increase of the rotation resistance of the guide vane, the rotation is not flexible, the closure between the guide vanes is poor, and the hydraulic streamline is distorted, so that the generating efficiency of the water turbine is reduced finally. In addition, the guide vane shaft is worn and leaks water, so that clearance cavitation is easy to generate, and the sealing structure of the guide vane shaft neck is damaged. Therefore, a large amount of manpower and material resources are required to be invested in each year in a hydropower plant to repair severely damaged areas on the surfaces of the shaft sections and the guide vane blades.

At present, most domestic power plants adopt a manual surfacing method to repair guide vanes, firstly, the abrasion part of a guide vane shaft is welded to the original size or is larger than the original size, then, the welded part is ground to an ideal surface or is close to the ideal surface by a turning or grinding method, because the surfacing area is large, the labor intensity of workers is high, the working environment is severe, the health of the workers is seriously damaged, and the manual surfacing has certain randomness, so that the welding quality is difficult to ensure. In order to improve the productivity of guide vane arbor recovery, ensure the surfacing quality and reduce the labor intensity of workers, the invention develops the automatic surfacing equipment for repairing the guide vane of the water turbine.

Disclosure of Invention

The invention mainly solves the technical problem of providing the automatic surfacing device for repairing the guide vane of the water turbine, which can complete surfacing of the guide vane shaft and the guide vane blade, improve the surfacing repair efficiency of the guide vane and reduce the labor intensity of workers.

In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides a hydraulic turbine stator restores automatic surfacing device, includes switch board, gear motor, XYZ step motor linear modulus group, chuck, tailstock, guide rail and frame. The control cabinet consists of an air-containing switch, a frequency converter, a 380V-to-220V transformer, a switching power supply, a PLC (programmable logic controller), a touch screen, a stepping motor driver, an AD (analog-to-digital) conversion module, a starting button, a wiring terminal, a knob switch and a power distribution box body; the speed reducing motor is connected with the chuck through an output shaft; the XYZ stepping motor linear module group consists of three stepping motors, a space conversion connector, four synchronous belt linear modules and a support frame thereof; the tail frame is arranged on the guide rail; the frame is used for fixing and mounting the components.

Further, the frequency converter is installed at the upper end of the air switch, the 380V-220V transformer is installed on the left side of the air switch, the switching power supply is installed on the left side of the 380V-220V transformer, the PLC is installed above the switching power supply, and the devices are all installed inside the control cabinet; the starting button is installed on the control box body door, the knob switch is installed on the right side of the starting button, and the touch screen is installed above the starting button.

Furthermore, the rotation of the chuck is controlled by a PLC (programmable logic controller) to match with the speed reducing motor to reduce the output rotating speed so as to meet the speed requirement of welding the guide vane shaft.

Further, a Hall sensor is arranged at the mounting position of the chuck and used for monitoring the rotating speed of the chuck.

Further, the XYZ stepping motor linear module is independently arranged on one side opposite to the position of the control cabinet, and the surfacing welding gun is arranged on a sliding block of the vertical synchronous belt.

Further, the central line of the chuck is superposed with the central line of the tail frame tip cone.

Further, the tailstock may be movable on a rail along a centerline of the chuck.

Drawings

FIG. 1 is a schematic perspective view of an automatic surfacing apparatus for repairing a guide vane of a water turbine according to a preferred embodiment of the present invention;

FIG. 2 is a top view of an automatic surfacing device for repairing a guide vane of a water turbine according to the present invention;

fig. 3 is a schematic view of the interior of the control box.

The components in figure 1 are labeled as follows:

1, a control cabinet; 2, rotating the chuck; 3 clamping a tail frame; 4 water turbine guide vanes; 5, welding a gun 6, namely a stepping motor 1; 7, a stepping motor 2; 8 stepping motor 3

The components in fig. 2 are labeled as follows:

9 a speed reducing motor; 10XYZ stepping motor linear module assembly; 11 a guide rail; 12 machine frame

The components in fig. 3 are labeled as follows:

1 frequency converter, 2 air switches, 3 switching power supplies, 4 intermediate relays, 5 transformers and 6 PLC.

Detailed Description

In order that the present disclosure may be clearly understood and appreciated, a preferred embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present disclosure may be more readily understood and appreciated by those skilled in the art, thereby clearly defining the scope of the present disclosure.

The technical scheme of the invention is as follows: an automatic surfacing device for repairing a guide vane of a water turbine is shown in attached figures 1 and 2 and comprises a control cabinet 1; 2, rotating the chuck; 3 clamping a tail frame; 4 water turbine guide vanes; 5, welding a welding gun; 9 a speed reducing motor; 10XYZ stepping motor linear module assembly; 11 a guide rail; 12 rack. As shown in figure 2, a 12-frame is taken as a center, a control cabinet is arranged on the left side of the frame, a 10XYZ stepping motor linear module group is arranged on the rear side of the frame, and a guide rail 11 is flatly arranged on the 12-frame. As shown in figure 1, the 3-tail frame leans against the right side of a frame 12 and is connected with a slide block on a guide rail 11 through a bolt; 2 chuck, 9 gear motor install on the fixed station of place through the hub connection, and 9 gear motor drive chuck 2 rotates during operation.

The 10XYZ stepping motor linear module comprises 6 stepping motors 1, 7

stepping motors

2, 8 stepping motors 3 and a support frame thereof. The stepping motor 1 enables the movement of the welding gun to be defined as the movement of the welding gun along the Z axis at a spatial position; the stepping motor 2 enables the movement of the welding gun to be defined as the movement of the welding gun along the Y axis; the stepping motor 3 defines the moving direction of the welding gun as moving along X.

As shown in fig. 2, the internal components of the control device include: 1 frequency converter, 2 air switches, 3 switching power supplies, 4 intermediate relays, 5 transformers, and 6 Mitsubishi PLC. The frequency converter 1 is installed on the upper portion of the air switch 2, the switching power supply 3 and the relay 4 are installed on the same fixed rail and are arranged on the left side of the frequency converter, the left side of the air switch is a 6 Mitsubishi PLC, and the transformer 5 is arranged on the PLC.

The specific control method and the working process of the invention are as follows: firstly, through a touch screen spin welding mode on the control cabinet 1: a guide vane shaft welding mode or a guide vane blade welding mode.

When the guide vane shaft is welded: as shown in the attached drawing 1, during welding, an operator clamps 4 guide vanes, controls a 10XYZ linear module group through a touch screen of a control cabinet 1, moves a 5 welding gun to a guide vane shaft welding initial position, selects a shaft welding mode, sets a shaft surfacing length L (mm), a surfacing shaft diameter d (mm) and a welding rotating speed V (mm/min), and clicks a start button to start welding. The PLC controls the frequency converter to output corresponding frequency according to a set numerical value, the PLC and the frequency converter are utilized to control 9 a speed reducing motor to enable the rated output rotating speed to be reduced and converted from 1440 revolutions per minute through the speed reducer, the final output rotating speed at the 2-chuck position is stable, the rotating speed reaches a set value, and then the welding machine is started to start surfacing operation. And recording the welding time by taking the starting of the welding machine as a standard, and automatically stopping the welding when the welding time is equal to the time calculated by the PLC. Because hall sensor's existence not only can detect motor output rotational speed can also pass through PLC record guide vane axle number of turns to the welding number of turns is taken as the accurate record welding number of turns for every turn of welder starts, and the welding automatic stop when the number of turns that has welded is equal with PLC calculation number of turns. If the guide vane shaft is seriously abraded, one-time overlaying welding cannot meet the requirement, and the steps can be repeated.

When the guide vane blade is welded: when welding, an operator clamps 4 guide vanes, controls a 10XYZ linear module group through a touch screen of the control cabinet 1, moves the 5 welding guns to the surfacing start position of the guide vane blades, sets the welding speed, and controls the distance from the 5 welding guns to the 4 guide vane blades to be constant through the PLC and the sensors thereof, so that the proper extension amount and the surfacing distance of welding wires are ensured. In order to ensure that the distance between the 5 guide vane blade and the 4 guide vane blade is kept unchanged, three

stepping motors

6, 7 and 8 in a 10XYZ linear module group are required to be matched with each other to complete space movement, and meanwhile, the speed reducing motor 9 drives the guide vane 4 to do corresponding rotary motion through the 2 rotating chuck, so that the aim of repairing the guide vane blade is fulfilled.

For the above embodiments, reference is made to fig. 1, fig. 2 and fig. 3.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An automatic surfacing device for repairing a guide vane of a water turbine is characterized by comprising a control cabinet 1; 2, rotating the chuck; 3 clamping a tail frame; 4 water turbine guide vanes; 5, welding a welding gun; 9 a speed reducing motor; 10XYZ stepping motor linear module assembly; 11 a guide rail; 12 rack.

2. As shown in figure 2, a 12-frame is taken as a center, a control cabinet is arranged on the left side of the frame, a 10XYZ stepping motor linear module group is arranged on the rear side of the frame, and a guide rail 11 is flatly arranged on the 12-frame.

3. As shown in figure 1, the 3-tail frame leans against the right side of a frame 12 and is connected with a slide block on a guide rail 11 through a bolt; 2 chuck, 9 gear motor install on the fixed station of place through the hub connection, and 9 gear motor drive chuck 2 rotates during operation.

4. The automatic surfacing device for repairing the guide vane of the water turbine according to claim 1, wherein the 10XYZ stepping motor linear module group comprises a 6 stepping motor 1, a 7 stepping motor 2, a 8 stepping motor 3 and a support frame thereof.

5. The stepping motor 1 enables the movement of the welding gun to be defined as the movement of the welding gun along the Z axis at a spatial position; the stepping motor 2 enables the movement of the welding gun to be defined as the movement of the welding gun along the Y axis; the stepping motor 3 defines the moving direction of the welding gun as moving along X.

6. The automatic surfacing device for repairing the guide vane of the water turbine according to claim 1, wherein a Hall sensor is mounted at the mounting position of the chuck and used for monitoring the rotating speed of the chuck.

7. The automatic surfacing device for repairing the guide vane of the water turbine according to claim 1, wherein the XYZ stepping motor linear module group is independently installed on the side opposite to the position of the control cabinet, and the surfacing welding gun is installed on a sliding block of a synchronous belt in the vertical direction.

8. The automatic surfacing device for repairing the guide vane of the water turbine according to claim 1, wherein the central line of the chuck is overlapped with the central line of the tail frame top cone.

9. The automatic surfacing device for repairing the guide vane of the water turbine according to claim 1, wherein the tailstock can move along the central line of the chuck on the guide rail.