JP2855267B2 - Measuring device for horizontal flange surface distance for turbine casing lifting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam turbine used in a thermal power plant and a nuclear power plant. Related to a measuring device.

[0002]

2. Description of the Related Art A steam turbine used in a thermal power plant and a nuclear power plant must be disassembled and inspected and repaired in case of regular repair or breakdown. The casing of a steam turbine is usually divided into an upper member and a lower member on a horizontal plane, and when inspecting and repairing the turbine, the upper member of the casing must be removed from the lower member and disassembled. The fitting portion between the upper member and the lower member is a so-called spigot, and the portion is accurately finished so as to have a very small dimensional tolerance. Therefore, when the upper member is removed, if the horizontal flange surface, which is the mounting surface, is not moved while being kept parallel to the time of assembling, the spigot portion may be seized. Since the upper member of the cabin of a turbine usually used in a power plant or the like is considerably heavy, a crane must be used for removing the turbine member.

Conventionally, the following method has been used to remove the upper member. That is, a rope is attached to a plurality of positions (usually four positions) of the upper member, and a chain block is attached between the rope and a hook of the crane. When the crane is lifted to a slight height by operation, the distance between the horizontal flange surfaces of the upper and lower members is measured, and the chain block is operated so that the distance of each part becomes uniform. While repeating such operation of the crane and the operation of the chain block until the distance between the horizontal flange surfaces reaches a predetermined size,
lift. As another method, the following was used. That is, jacks are installed at three or more locations between the upper member and the lower member, and each jack is operated simultaneously.
Measure the distance between the horizontal flange surfaces of the upper and lower members, and adjust the jack so that the distance of each part is uniform. While the operation and adjustment of such jacks are frequently repeated, the jacks are lifted by a crane after the distance reaches a predetermined dimension. All of these conventional methods have disadvantages in that measurement and adjustment must be frequently repeated, which takes time and requires a large number of operators. Further, if the number of measurements and adjustments is reduced to save time, there is a disadvantage that galling occurs on the spigot surface.

Heretofore, the present applicant has proposed a method according to the following procedures in order to improve the above-mentioned conventional method. That is, the fastening bolts of the upper and lower members of the turbine casing are removed, wires are attached to a plurality of positions of the upper member of the turbine casing, the wires are attached to hooks of the crane, and the upper member is supported by the crane. A sensor for measuring the distance between horizontal planes, a conversion unit for converting the result measured by the sensor into an electric signal, and a display unit for converting the electric signal back into a measured value and displaying it digitally. The display unit is installed at three or more locations close to the opposed horizontal flange surfaces, and the display unit is installed at a position where an operator can easily see it. A jack is installed between a plurality of upper and lower members including the vicinity of the sensor installation part, an operator arranged in each jack operates the jack and lifts the upper member, and each sensor installation part displayed on the display unit. Adjust each jack so that the distance between the horizontal flange surfaces is the same. The above operation is repeated until the lifting dimension of the upper member reaches a predetermined amount. The upper member is further lifted by the crane to disassemble the upper and lower members of the turbine casing.

According to the proposed method, the distance between the horizontal flange surfaces of the upper and lower members is automatically measured and displayed, so that the operation of the jack can be performed easily and reliably, and the time required for the operation is required. Can be significantly reduced, and the excellent effect of preventing damage to the fitting portions of the upper and lower members can be achieved. However, this method cannot avoid the following disadvantages. That is, since the display unit and the sensor or the conversion unit are connected by a cable, much time is required for laying and clearing the cable. The laid cable may be damaged or cut by a vehicle or the like. There is a problem in safety, such as the worker stalling due to the laid cable. The display shows only the numerical value of the distance between the horizontal flange surfaces of each sensor part, but the operator reads it and takes special measures in some cases (for example, the deviation between the numerical values is more than a certain value). , The operation of each jack is temporarily stopped, and the operation is switched to the operation of only a specific jack.) It is necessary to perform the operation, and an erroneous operation may occur due to an erroneous judgment of the worker.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the method for removing the upper member of the turbine casing, shortens the working time, eliminates erroneous operations, ensures safe operation, and secures the upper and lower parts of the turbine casing. An object of the present invention is to provide a method for preventing damage to a fitting portion of a member, and to provide a measuring device necessary for the method.

[0007]

SUMMARY OF THE INVENTION The above-mentioned drawback of the method for removing the upper member of the turbine casing is an improvement of the measuring device for measuring the distance between the horizontal flange surfaces used for lifting the upper member of the turbine casing. Therefore, the above-mentioned problem is solved by configuring the measuring device from the following elements (a) to (d). That is, (a) a drum having one end fixed to a pin attached to one of the upper and lower members of the turbine casing and the other end connected to a winder attached to the other of the upper and lower members. A fixed wire, a pulley attached to the other of the upper and lower members and rotating in engagement with the wire, and a rotary variable resistor attached to the pulley and rotated, the horizontal flange surface distance Sensors that measure the change in resistance of a variable resistor as a change in resistance and output the measured value as a pulse signal. (b) A plurality of wireless digital counters for digitizing the pulse signal from the sensor and transmitting the digitized signal wirelessly. (c) A wireless data collection device that receives signals from the plurality of wireless digital counters. (d) connected to the wireless data collection device, receiving a signal therefrom, re-converting it to the distance between the horizontal flange surfaces of the upper and lower members, and analyzing the signal to instruct the worker, A personal computer that creates three-dimensional illustrations of the situation of the surface distance between horizontal flanges and displays these on the screen.

[0008] According to the above configuration, since a cable for connecting each element is not required, one of the above-mentioned drawbacks is considered.
Can be eliminated, and the disadvantage can be eliminated because the personal computer shares the judging task.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing an outline of a measuring device for a horizontal flange surface distance for hanging a turbine casing (hereinafter simply referred to as a “measuring device for a surface distance”) according to the present invention.
In FIG. 1, an inter-plane distance measuring device 1 includes a sensor 11,
It comprises a wireless digital counter 21, a wireless data collection device 31, and a personal computer 41. 2 in the figure is an upper member of the turbine casing. FIG. 2 is a diagram showing the sensor 11, (a) is a diagram showing a method of attaching to the turbine casing, and (b) is a diagram showing details of a main part. In FIG. 1A and FIG.
A pin 5 is attached to a horizontal flange 3 of the upper member 2 of the turbine casing by a magnetic base 4. In addition, the horizontal flange 6 of the lower member of the turbine casing
Has a magnetic base 4 and a sensor case 12
Is installed. One end of a wire 13 is fixed to the pin 5. A plurality of sensors 11 are mounted on the turbine casing (normally, four sensors 11 are provided at each of the four corners of the casing as shown in FIG. 1).

In FIG. 2B, the sensor case 12
A wire winder 14 and a drum 15 connected to the wire winder 14 are housed in the inside, and the other end of the wire 13 is fixed to the drum 15. A pulley 16 is also housed inside the sensor casing, a part of a wire 13 connecting the pin 5 and the drum 15 is engaged with the pulley, and the central axis of the pulley 16 is a rotary variable resistor 17.
It is connected to. If the distance between the horizontal flange 3 and the horizontal flange 6 changes, the wire 13 moves linearly,
Accordingly, the variable rotation resistor 17 rotates via the pulley 16, and a change in the distance between the surfaces of the horizontal flange is converted into a change in resistance.

The wireless digital counter 21 has a main body 22.
And the transmitter 23, and the same number (four in the illustrated case) of the sensors are provided near the sensor 11.
The sensor 11 is connected with a short cable 24. The change in the resistance of the variable resistor 17 is transmitted to the main body 22 via a cable 24 by a pulse signal, where the pulse signal is digitized and transmitted from a transmitter 23 by radio.

The wireless data collection device 31 is composed of a main body 32 and a receiver 33, and is usually provided in proximity to a worker who operates a jack. All digital signals from the plurality of wireless digital counters are received by the receiver 33 and collected by the main body 32. The computer 41 includes a main body 42 and a display 43, and is provided in proximity to the wireless data collection device 31, and is connected by a short cable 44 therebetween. The main body 42 of the computer can analyze and edit the data sent from the wireless data collection device 31 and display it on the display 43 as a number of data as exemplified below. Batch display of distances between four surfaces, and display of deviation values. Batch display of the distance between two surfaces, and display of the deviation value. Proper instructions for workers. A three-dimensional illustration of the condition of the distance between the horizontal flanges of the upper and lower members of the turbine casing.

Although it is desired that the wireless data collection device 31 and the computer 41 be placed near workers due to their nature, data can be collected wirelessly, so that they can be placed away from the work site. Yes, it can be placed in an office to manage work. Even if there is only one main body 42 of the computer, it is possible to place several displays 43 to make it easy for an operator to see.

[0014]

According to the present invention, the surface-to-surface distance measuring device is composed of a plurality of sensors, a plurality of wireless digital counters, a wireless data collecting device, a personal computer, and the like. It has the effect that it has. When disassembling and inspecting the turbine, when lifting the upper member of the turbine casing, the worker operating the jack is clearly informed of the distance between the horizontal flange surfaces of the upper and lower members of the turbine casing, and given an appropriate instruction. Can be released from the judgment work and erroneous operation can be prevented. Since there is no need to attach a cable to the work site, work setup and cleanup are easy, and the work time can be greatly reduced. It is possible to prevent accidents such as cable disconnection and accidents in which workers trip over the cables, thereby improving work safety. Damage to the fitting portion between the upper and lower members of the turbine casing can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an outline of an apparatus for measuring a distance between surfaces according to the present invention.

FIGS. 2A and 2B are diagrams showing a sensor, wherein FIG. 2A is a diagram showing a method of attaching the sensor to a turbine casing, and FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Measurement device of surface distance 2 Upper member 3 Horizontal flange 4 Magnetic base 5 Pin 6 Horizontal flange 11 Sensor 12 Sensor case 13 Wire 14 Wire winder 15 Drum 16 Pulley 17 Rotary variable resistor 21 Wireless digital counter 22 Main unit 2
3 Transmitter 24 Cable 31 Wireless data collection device 32 Main unit 33
Receiver 41 Computer 42 Main unit 43 Display 44 Cable

Claims (1)

(57) [Claims] When the turbine is disassembled and inspected, the distance between a horizontal flange surface for lifting a turbine casing used for lifting an upper member of the turbine casing is constituted by the following components (a) to (d). Measuring device. (a) One end is fixed to a pin attached to one of the upper and lower members of the turbine casing, and the other end is fixed to a drum connected to a winder attached to the other of the upper and lower members. A horizontal pulley attached to the other of the upper and lower members, the pulley being engaged with the wire and rotating; and a rotating variable resistor attached to the pulley and rotating. Sensors that measure the change in resistance of a variable resistor and output the measured value as a pulse signal. (b) A plurality of wireless digital counters for digitizing the pulse signal from the sensor and transmitting the digitized signal wirelessly. (c) A wireless data collection device that receives signals from the plurality of wireless digital counters. (d) connected to the wireless data collection device, receiving a signal therefrom, reconverting the distance between the horizontal flange surfaces of the upper and lower members, and analyzing the signal to instruct the worker, A personal computer that creates three-dimensional illustrations of the surface-to-plane distance situation and displays them on the screen.