Steam turbine bolt hot tightening angle arc length conversion device

Abstract

The utility model relates to a steam turbine bolt hot tightening angle arc length conversion device, which belongs to the technical field of steam turbine maintenance, and particularly comprises a pin shaft arranged in the center of a dial, a first pointer and a second pointer are arranged on the pin shaft, and the first pointer and the second pointer are respectively connected with an extension connecting rod. A sliding seat is installed on the extension connecting rod in a sliding mode, adjusting rods are installed at the bottom of the sliding seat, a soft calibrated scale is fixed to the bottom of one adjusting rod, a sliding block is installed at the bottom of the other adjusting rod, a sliding groove used for the soft calibrated scale to penetrate through is formed in the sliding block, and the soft calibrated scale is installed in the sliding groove; the device can quickly measure the hot tightening arc length of the nut according to the rotation angle of the bolt and the nut, improves the tightening accuracy of the nut, and is simple and convenient to use and high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam turbine bolt heat tightening angle arc length conversion device belongs to steam turbine overhauling technical field. BACKGROUND

[0002] In the overhauling process of steam turbine, the high-pressure cylinder bolt and nut are important connecting components in the power plant system, with the gradual increase of unit capacity and the increase of power, the cylinder bolt and nut are also larger and larger, and the tightening requirement of the bolt and nut is also more and more strict. During the overhauling process, if the bolt and nut are not tightened to the required arc length or angle during the heating and tightening of the cylinder bolt, various defects and problems will be caused. If the arc length is not tightened in place, it may cause steam leakage of the cylinder joint surface during operation, causing damage to the cylinder joint surface; if the nut is tightened beyond the specified arc length, it may cause the connection bolt to break or the screw rod to stretch during operation, affecting the service life of the bolt, and there is a risk of personnel safety and equipment damage. Therefore, we need to tighten the cylinder joint surface bolt strictly according to the overhauling process.

[0003] The traditional bolt tightening method relies on manual calculation and heat tightening arc length, which is not only low in efficiency, but also prone to errors. The traditional arc length measurement method is as follows: 1. Determine the radius of the nut circle: first, measure the radius of the nut circle using a tape measure or other measuring tool; 2. Angle: then find the angle given in the operation instruction book or overhauling procedure; 3. Calculation: Arc length calculation formula: L=(n(central angle)*π*r) / 180=α*r In a circle with radius r, because the arc length corresponding to a 360° central angle is equal to the circumference C=2πr, the arc length corresponding to a n° central angle is L=n°πr÷180° (L=(n°*2πr) / 360°). Example: the radius is 1 cm, and the arc length corresponding to a 45° central angle is L=nπr / 180=45*π*1 / 180=45*3.14*1 / 180 approximately equal to 0.785.

[0004] The arc length of the sector is the second formula: the arc length of the sector is actually the length of one side of the circle, and the angle of the sector is one of 360 degrees, so the arc length of the sector is one of the circumference of the circle, so we can get: Arc length of sector=2πr*angle / 360. Where 2πr is the circumference of the circle, and angle is the angle value of the sector.

[0005] In order to enable each maintenance worker to operate and prevent errors, we urgently need a tool that can quickly and accurately measure the arc length corresponding to the bolt heat tightening angle. UTILITY MODEL CONTENTS

[0006] The utility model provides a steam turbine bolt heat tight angle arc length conversion device which can quickly measure the nut heat tight arc length according to the rotation angle of the bolt and nut, improves the accuracy of nut fastening, is simple and convenient to use, and has high practicality.

[0007] In order to achieve the above object, the utility model adopts the technical scheme of a steam turbine bolt heat tight angle arc length conversion device, which comprises a dial, a first pointer and a second pointer.

[0008] Preferably, the sliding seat slides along the extension connecting rod, and the sliding seat and the extension connecting rod are not rotated relative to each other, and the adjusting rod and the extension connecting rod are arranged perpendicularly.

[0009] Preferably, the extension connecting rod is a flat rod, the sliding seat is provided with a flat mouth matched with the flat rod, and the extension connecting rod is slidingly installed in the sliding seat.

[0010] Preferably, the bottom of the dial is provided with an adsorbing magnet.

[0011] Compared with the prior art, the utility model has the following technical effects: the utility model can greatly improve the maintenance work efficiency and quality of different bolts, and reduces the risk of manual calculation and operation errors. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 FIG. 1 is a structural schematic diagram of the utility model.

[0013] Figure 2 FIG. 2 is a structural schematic diagram of the utility model in use. DETAILED DESCRIPTION

[0014] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0015] As shown in Figure 1 and Figure 2 The steam turbine bolt heat-tight angle arc length conversion device, including the dial 1, the first pointer 2 and the second pointer 3, the center of the dial 1 is installed with the pin shaft 4, the pin shaft 4 is installed with the first pointer 2 and the second pointer 3, the first pointer 2 and the second pointer 3 are connected with the extension connecting rod 5 respectively, the extension connecting rod 5 is slidably installed with the sliding seat 6, the bottom of the sliding seat 6 is installed with the adjusting rod 7, the bottom of one of the adjusting rods 7 is fixed with the soft scale 8, the bottom of the other adjusting rod 7 is installed with the sliding block 9, the sliding block 9 is provided with the sliding groove for the soft scale to pass through, and the soft scale 8 is installed in the sliding groove.

[0016] The utility model discloses install two rotatable first pointer 2 and second pointer 3 on the dial 1, the first pointer 2 and the second pointer 3 tail are connected with the extension connecting rod 5, the extension connecting rod 5 is used for installing the sliding seat 6 that can slide along it, the sliding seat 6 bottom installs the adjusting rod 7, through the sliding of sliding seat 6, can drive the sliding block 9 to move on the soft scale 8. Through the sliding of sliding seat 6, can adjust according to different bolt radius. In this way, in use, according to the bolt nut heat-tight rotation angle, install the dial 1 on the bolt hole, align the center point, without measuring the nut radius, adjust the sliding seat 6 of the first pointer 2 and the second pointer 3 to the bolt circumference, the adjusting rod 7 is close to the circumference, and the sliding block 9 at the bottom of the adjusting rod 7 directly measures the heat-tight arc length of the nut on the scale, and the arc length can be directly read in the scale.

[0017] Among them, the sliding seat 6 slides along the extension connecting rod 5, and the sliding seat 6 and the extension connecting rod 5 do not rotate between them, the adjusting rod 7 and the extension connecting rod 5 are vertically arranged, the extension connecting rod 5 is a flat rod, the sliding seat 6 is provided with a flat mouth matched with the flat rod, and the extension connecting rod 4 is slidably installed in the sliding seat. By adopting this structure, the sliding seat 6 can be ensured to slide in a specific direction without deflection. The bottom of the dial 1 is installed with an adsorbing magnet, which facilitates actual measurement.

[0018] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the scope of the utility model.

Claims

1. A device for converting the angle and arc length of a steam turbine bolt thermal tightening, characterized in that: The application relates to a dial, a first pointer and a second pointer, the center of the dial is provided with a pin shaft, the pin shaft is provided with the first pointer and the second pointer, the first pointer and the second pointer are respectively connected with extension connecting rods, the extension connecting rods are slidably provided with sliding seats, the bottom of the sliding seat is provided with adjusting rods, the bottom of one of the adjusting rods is fixedly provided with a soft scale, the bottom of the other adjusting rod is provided with a sliding block, the sliding block is provided with a sliding groove for the soft scale to pass through, and the soft scale is arranged in the sliding groove.

2. The apparatus for converting the angle and arc length of a steam turbine bolt for thermal tightening according to claim 1, characterized in that: The sliding seat slides along the extension connecting rod, and the sliding seat and the extension connecting rod are not rotated relative to each other, and the adjusting rod and the extension connecting rod are vertically arranged.

3. The turbine bolt thermal tightening angle arc length conversion device according to claim 2, characterized in that: The extension connecting rod is a flat rod, the sliding seat is provided with a flat mouth matched with the flat rod, and the extension connecting rod is slidably arranged in the sliding seat.

4. The steam turbine bolt up-tight angle-arc length conversion device of claim 1, wherein: The bottom of the dial is provided with an adsorbing magnet.

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