Scale distance adjustable extensometer

Abstract

The utility model discloses an extensometer with an adjustable scale distance, which comprises a rectangular bottom plate, four magnetic meter seats which are symmetrically arranged and two fixtures, the four magnetic meter seats are divided into two groups and are arranged on the bottom plate, the magnetic meter seats and the bottom plate are fixed through magnetic attraction, L-shaped connecting seats are fixedly arranged on the magnetic meter seats, and the two fixtures are arranged on the L-shaped connecting seats. A U-shaped mounting seat is fixedly mounted between each group of connecting seats, a horizontal springback grating ruler is fixedly mounted on one side of each mounting seat, a ruler extending out is arranged at the front end of each springback grating ruler, the fixture is of a U-shaped shell structure formed by bending a metal plate, the fixture is provided with a clamping groove extending to the lower side, a through hand-screwing bolt is in threaded connection with the back side of the fixture, and the hand-screwing bolt is in threaded connection with the back side of the fixture. And the sample clamped into the clamping groove is pressed and fixed by screwing the bolt by hand. According to the extensometer, the scale distance in the use process can be rapidly changed, and different test use requirements are met. Different special fixtures are arranged for overhead conductor samples of different specifications, so that the samples to be tested can be quickly clamped.

Description

Technical Field

[0001] The utility model relates to the technical field of cable test and detection, in particular to an extensometer with adjustable gauge length. Background Technique

[0002] In order to meet the mechanical property requirements of overhead cables, mechanical property tests are often carried out before the overhead cables are put into use. Among them, the creep resistance of overhead cables is a very important test. Since the overhead cables work under tension (their own gravity) for a long time, the elongation caused by the dislocation and slip between the internal crystals is called creep, and its creep characteristics change with time. The creep test is used to determine the structural stability of overhead cables when they work under load for a long time. An extensometer is an instrument used for creep measurement. The existing extensometers have the problem that the gauge length (i.e., the initial length of the specimen extension, Figure 2 where L0 represents the gauge length) is not convenient to quickly adjust or difficult to adjust during use. Content of the Utility Model

[0003] The purpose of the utility model is to provide an extensometer with adjustable gauge length to solve the problems put forward in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: An extensometer with adjustable gauge length includes a rectangular bottom plate, and also includes four symmetrically arranged magnetic bases and two clamps. The four magnetic bases are divided into two groups and arranged on the bottom plate. The magnetic bases are fixed to the bottom plate by magnetic attraction. An L-shaped connecting seat is fixedly installed on the magnetic base. A U-shaped mounting seat is fixedly installed between each group of connecting seats. A horizontal spring-back grating scale is fixedly installed on one side of the mounting seat. A scale extends from the front end of the spring-back grating scale. The clamp is a U-shaped shell structure formed by bending sheet metal. The clamp is provided with a slot extending to the lower side. A hand-tightening bolt is screwed through the back side of the clamp, and the hand-tightening bolt presses and fixes the specimen clamped in the slot.

[0005] Preferably, a V-shaped notch is provided on the side of the slot opposite to the hand-tightening bolt.

[0006] Preferably, the mounting seat is provided with a through hole penetrating horizontally, and the scale penetrates through the through hole and is in clearance fit with it.

[0007] Compared with the prior art, the beneficial effects of the utility model are: This extensometer can quickly change the gauge length during use to meet different test requirements. Different special clamps are set for overhead wire specimens of different specifications to facilitate quickly clamping the specimens to be tested. Description of the Drawings

[0008] Figure 1Schematic three-dimensional structure diagram of the present utility model;

[0009] Figure 2 Schematic top view structure diagram of the present utility model;

[0010] Figure 3 Schematic side view structure diagram of the present utility model.

[0011] In the figure: 1, bottom plate; 2, magnetic base; 3, connecting seat; 4, fixture; 5, hand-tightening bolt; 6, spring-back type grating ruler; 7, mounting seat; 8, card slot; 9, scale. Specific implementation manner

[0012] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0013] Please refer to Figures 1-3 , the present utility model provides a technical solution: an extensometer with adjustable gauge length, including a rectangular bottom plate 1, further including four symmetrically arranged magnetic bases 2 and two fixtures 4. The four magnetic bases 2 are divided into two groups and arranged on the bottom plate 1. The magnetic base 2 is fixed to the bottom plate 1 by magnetic attraction. The magnetic base 2 is provided with a knob switch for controlling tightening and loosening (the magnetic base is a mature product on the current market). The bottom plate 1 is provided with scale lines along the length direction, and the scale lines are used to mark the position of the magnetic base 2. An L-shaped connecting seat 3 is fixedly installed on the magnetic base 2. A U-shaped mounting seat 7 is fixedly installed between each group of connecting seats 3. A horizontal spring-back type grating ruler 6 is fixedly installed on one side of the mounting seat 7. The front end of the spring-back type grating ruler 6 is provided with an extended scale 9. The mounting seat 7 is provided with a through hole penetrating transversely. The scale 9 passes through the through hole and has a clearance fit with it. During the test, the front end of the scale is abutted against the fixture 4. After the specimen is extended, the scale 9 has a telescopic change (using △L1 and △L2 to calculate the deformation amount).

[0014] The fixture 4 is a U-shaped shell structure formed by bending sheet metal. The fixture 4 is provided with a card slot 8 extending to the lower side. A through hand-tightening bolt 5 is screwed on the back side of the fixture 4. The hand-tightening bolt 5 presses and fixes the specimen clamped in the card slot 8. The side of the card slot 8 is provided with a V-shaped notch on the side opposite to the hand-tightening bolt 5. The notch is used to position the cable specimen to prevent it from sliding down.

[0015] Working principle: The spring-back type grating ruler 6 is correspondingly installed on the magnetic base 2. The magnetic base 2 can be quickly disassembled and installed on the bottom plate 1, and thus the distance between the two groups of magnetic bases 2 can be quickly adjusted to freely adjust the gauge length. The spring-back type grating ruler 6 is used to measure the displacement deformation amount of the specimen during the extension process for calculating the creep characteristics.

[0016] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An extensometer with adjustable gauge length, comprising a rectangular base plate (1), characterized in that: It also includes four symmetrically arranged magnetic bases (2) and two clamps (4). The four magnetic bases (2) are divided into two groups and arranged on the bottom plate (1). The magnetic bases (2) are fixed to the bottom plate (1) by magnetic attraction. An L-shaped connecting seat (3) is fixedly installed on the magnetic base (2). A U-shaped mounting seat (7) is fixedly installed between each group of connecting seats (3). A horizontal retractable grating ruler (6) is fixedly installed on one side of the mounting seat (7). A protruding scale (9) is provided at the front end of the retractable grating ruler (6). The clamp (4) is a U-shaped housing structure formed by sheet metal bending. The clamp (4) is provided with a slot (8) extending to the lower side. A through-hand-tightening bolt (5) is screwed on the back side of the clamp (4). The hand-tightening bolt (5) presses and fixes the specimen clamped in the slot (8).

2. An extensometer with adjustable gauge length according to claim 1, characterized in that: A V-shaped notch is provided on the side of the slot (8) opposite to the hand-tightening bolt (5).

3. The extensometer with adjustable gauge length according to claim 1, wherein: The mounting seat (7) is provided with a laterally through hole, and the scale (9) passes through the through hole and has a clearance fit with it.

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