Length measuring device for coupling bolt of water-turbine generator set

Abstract

The utility model relates to a length measuring device for a coupling bolt of a water-turbine generator set. The device is composed of a coupling bolt, a length measuring rod, a sleeve, a locking cap, a locking screw and a dial indicator. The device can be applied to the design of a coupling bolt length measuring device of a large and medium-sized water-turbine generator set, and has the advantages of high measuring accuracy, strong reliability, small influence on the performance of the bolt, and simplicity and convenience in installation and operation; the problem that the elongation of the coupling bolt of the water-turbine generator set is easily influenced by objective factors such as the reliability of a test instrument and the proficiency of test personnel during measurement can be effectively solved.

Description

Technical field:

[0001] The utility model relates to the field of water turbine generators, in particular to a device for measuring the length of coupling bolts of a water turbine generator set. Background technology:

[0002] The coupling bolt is a key connection and transmission component in the rotating system of the hydro-turbine generator, and plays a vital role in the stability of the unit operation. In order to ensure that it has a good stress state when the unit is running, the coupling bolt needs to be pre-tightened and stretched during installation. Therefore, the measurement of the elongation of the coupling bolt is an important measure to ensure the safety of the engineering structure. At present, there are different measuring devices and methods for measuring the elongation of the bolt. The more commonly used measuring devices and methods are the thread gauge measurement method and the strain gauge measurement method. These two devices and methods will be affected by the instrument installation operation method and the tester's proficiency in the use of the instrument. For example, when using a thread gauge, it needs to be correctly installed on the bolt and ensure that it is perpendicular to the thread axis, otherwise it will affect the accuracy of the measurement results. Similarly, when using a strain gauge, you also need to be careful not to apply too much load to the bolt, otherwise it will cause damage to the strain gauge or distortion of the measurement results.

[0003] Taking into account the applicable conditions of each measuring device and method, it is decided that in practical applications, it is necessary to select appropriate measuring devices and methods according to specific circumstances, and pay attention to the details in the measurement process. The diameter of the coupling bolts of the hydro-generator set is large, and the accuracy of the preload value is required to be high. From the perspective of installation and measurement convenience, the accuracy and reliability of the measured values, and the influence on the performance of the bolts, it is necessary to design a length measuring device for the coupling bolts of the hydro-generator set to achieve high accuracy, strong reliability, small influence on the performance of the bolts, and simple and convenient installation and operation. Summary of the invention:

[0004] The purpose of the utility model is to provide a device for measuring the length of coupling bolts of a hydro-turbine generator set, so as to solve the problem that the elongation of coupling bolts of a hydro-turbine generator set is easily affected by objective factors such as the reliability of the test instrument and the proficiency of the test personnel. The technical scheme is as follows: it is composed of a coupling bolt, a measuring rod, a sleeve, a locking cap, a locking screw and a dial indicator. The coupling bolt is machined with a central through hole, the measuring rod is threadedly installed in the central through hole at one end of the coupling bolt, the sleeve is threadedly installed in the central through hole at the other end of the coupling bolt and is locked and fixed by the locking cap, the locking screw is threadedly installed on the side of the sleeve, the dial indicator is installed in the central hole of the sleeve, the dial indicator pointer is pressed against the end of the measuring rod and is locked and fixed by the locking screw.

[0005] In the above-mentioned device for measuring the length of the coupling bolts of a hydro-generator set, the locking screw is a cylindrical head screw.

[0006] Compared with other devices for measuring the length of coupling bolts of hydro-turbine generator sets, the utility model has the advantages of high measurement accuracy, strong reliability, little influence on bolt performance, and simple and convenient installation and operation. It effectively solves the problem that the elongation measurement of coupling bolts of hydro-turbine generator sets is easily affected by objective factors such as the reliability of the test instrument and the proficiency of the test personnel.

[0007] Working principle:

[0008] The elongation value of the bolts of the hydro-turbine generator set is usually measured with a dial indicator and a length measuring tool. Usually, the main shaft connecting bolts are hollow structures with a section of thread at both ends of the center hole of the main shaft connecting bolt. Before tightening the locking cap, the measuring rod should be screwed into this hole first, and the depth of one end of the measuring rod below the end face of the main shaft connecting bolt should be measured with a special dial indicator stand and a dial indicator. During the gradual tightening of the locking cap, the main shaft connecting bolt is stretched, and the measuring rod does not extend at this time. Use the dial indicator to measure the depth of one end of the measuring rod again, and subtract the recorded values ​​of the two measurements to get the elongation value of the main shaft connecting bolt. Description of the drawings:

[0009] Figure 1 The present invention is a front cross-sectional view of a device for measuring the length of coupling bolts of a hydro-generator set.

[0010] Markings in the figure: 1- coupling bolt, 2- measuring rod, 3- sleeve, 4- locking cap, 5- locking screw, 6- dial indicator. Specific implementation method:

[0011] like Figure 1 As shown, a coupling bolt length measuring device for a hydro-turbine generator set comprises a coupling bolt 1, a measuring rod 2, a sleeve 3, a locking cap 4, a locking screw 5 and a dial indicator 6. The coupling bolt 1 is machined with a central through hole, the measuring rod 2 is threadedly mounted in the central through hole at one end of the coupling bolt 1, the sleeve 3 is threadedly mounted in the central through hole at the other end of the coupling bolt 1 and is locked and fixed by the locking cap 4, the locking screw 5 is a cylindrical head screw, the locking screw 5 is threadedly mounted on the side of the sleeve 3, the dial indicator 6 is mounted in the central hole of the sleeve 3, the pointer of the dial indicator 6 is pressed against the end of the measuring rod 2 and is locked and fixed by the locking screw 5.

[0012] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the scope and spirit of the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications.

Claims

1. A device for measuring the length of coupling bolts of a hydro-generator set, characterized in that: The utility model comprises a coupling bolt (1), a measuring rod (2), a sleeve (3), a locking cap (4), a locking screw (5) and a dial indicator (6). The coupling bolt (1) is machined with a central through hole. The measuring rod (2) is threadedly mounted in the central through hole at one end of the coupling bolt (1). The sleeve (3) is threadedly mounted in the central through hole at the other end of the coupling bolt (1) and is locked and fixed by the locking cap (4). The locking screw (5) is threadedly mounted on the side of the sleeve (3). The dial indicator (6) is mounted in the central hole of the sleeve (3). The pointer of the dial indicator (6) is pressed against the end of the measuring rod (2) and is locked and fixed by the locking screw (5).

2. A device for measuring the length of coupling bolts of a hydro-generator set according to claim 1, characterized in that: The locking screw (5) is a cylindrical head screw.

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