CN203518908U - Bending radius measuring ruler - Google Patents

Abstract

A bending radius measuring ruler, comprising a front support plate (2), a rear support plate (3), a measuring sheet storage slot (5), an inner bending radius measuring stick (4), an outer bending radius measuring stick (8), a cable radius Measuring sheet (6) and root straight section distance measuring sheet (7). The inner bending radius measuring stick (4) and the outer bending radius measuring stick (8) are respectively riveted between the front support plate (2) and the rear support plate (3) through rivets (1) and are located on the left side and the right side respectively. The measuring piece storage slot (5) is connected with the front bracket plate (2) through the fastener (9), and the cable radius measuring piece (6) and the root straight section distance measuring piece (7) are placed in the measuring piece storage groove (5) . Both the inner bending radius measuring stick (4) and the outer bending radius measuring stick (8) include at least one fan-shaped sheet with a known radius, and the cable radius measuring sheet (6) is a rectangular sheet with a circular arc segment opening with a known radius on the edge , the distance measuring sheet (7) of the straight line section at the root is a bar-shaped sheet with a size scale.

Description

A bending radius measuring ruler

technical field

The utility model relates to a measuring tool for the bending radius of a small satellite assembly cable, which is used for measuring the bending radius of the cable after the cable is laid on the small satellite, and is especially suitable for conformity of the bending radius of the high frequency, low frequency and LVDS wires on the satellite Interpretation.

Background technique

Cables installed on small satellites generally include low-frequency, high-frequency and LVDS wire cables. In the satellite assembly process, the equipment installation and cable laying work are carried out first, and then the electrical connectors at both ends of the cable are plugged into the corresponding equipment. Carry out final cable arrangement, binding and fixing work according to cable routing and fixing point positions.

In the process of cable laying, arrangement and fixing, the cable bending radius and root straight line distance of the above three types of cables after installation must comply with the corresponding installation process requirements. For example, the inner bending radius of low-frequency cables should generally not be less than 4 times the outer diameter of the cable, and the length of the straight line near the root of the plug should generally not be less than 30mm; the inner bending radius of flexible high-frequency cables should generally not be less than 5 times the outer diameter of the cable , the length of the straight line near the root of the plug is generally not less than 20mm; the minimum inner bending radius of the LVDS wire and cable is generally not less than 10 times the outer diameter of the cable, and the length of the straight line after the heat shrinkable tape of the cable tail cover is generally not less than 15mm.

In the past, after the cable was installed on the satellite, due to the lack of professional measuring tools, the inspectors could only rely on the naked eye and a ruler to roughly interpret and inspect the results of the bending radius after the cable was laid, resulting in the risk of inaccurate interpretation. Before judging the bending radius, first use a vernier caliper to measure the diameter of the cable body, then calculate the theoretical bending radius according to the requirements in the standard, then estimate the position of the center of the circle and measure the actual radius size with a ruler. This method of operation is cumbersome and inaccurate , and when using tools such as vernier calipers and tape measures to operate in a small space on the star, there is a risk that the tool will scratch other cables and equipment, and the inspection efficiency is low.

Utility model content

The technical problem of the utility model is: to overcome the problem that the cable bending radius cannot be measured and cannot be measured after the installation and fixing of the existing high-frequency and low-frequency and LVDS wire cables on the satellite, and provides a special measuring tool for the bending radius of the small satellite assembly cable. It can intuitively, conveniently and accurately measure the radius of the cable body, the bending radius and the distance of the straight line at the root. One foot can be used for multiple purposes, improving inspection efficiency and reducing operational risks.

The technical solution of the utility model is: a bending radius measuring ruler, including a front support plate, a rear support plate, a measuring piece storage slot, an inner bending radius measuring ruler, an outer bending radius measuring ruler, a cable radius measuring piece and a straight line section at the root Distance gauge; the inner bending radius gauge is riveted between the front bracket plate and the rear bracket plate and located on the left side, and the outer bending radius gauge is riveted between the front bracket plate and the rear bracket plate through rivets and located on the right side; The measuring sheet storage slot is connected with the front bracket plate by fasteners, and the cable radius measuring sheet and the root straight section distance measuring sheet are placed in the measuring sheet storage slot; the inner bending radius measuring ruler includes at least one fan-shaped sheet with a known radius , the outer bending radius measuring ruler also includes at least one fan-shaped sheet with a known radius, the cable radius measuring sheet is a rectangular sheet with an arc segment opening with a known radius at the edge, and the distance between the straight line section at the root The gauge sheet is a strip sheet with a size scale.

The number of fan-shaped flakes contained in the inner bending radius gauge or the outer bending radius gauge is 25. The number of the cable radius gauges is 3, including 22 arc segment openings. There is one measuring sheet for the straight-line distance at the root, and there are three size scales, and the three scales correspond to the straight-line distance at the root required after the laying of low-frequency cables, high-frequency cables, and LVDS cables.

Compared with the prior art, the utility model has the following advantages:

(1) This utility model solves the problem that the cable bending radius cannot be measured and cannot be measured after the installation and fixation of the high-frequency, low-frequency and LVDS wire cables on the satellite in the past. The body radius of the cable under test can be accurately measured by using four types of measuring rulers. , the bending radius (inner diameter) of the tested cable after laying, the bending radius (outer diameter) of the tested cable after laying, and the distance of the straight line section of the root of the tested cable after laying, which can intuitively and accurately determine the standard parameters of the cable after laying Conduct conformity judgment;

(2) In this utility model, aiming at the types and specifications of high-frequency and low-frequency and LVDS wire cables commonly used on the star, the current measuring ruler and the measuring sheet of the maximum envelope range of the cable radius are designed, so that the cables of all specifications currently used on the star are Included in the measured range, strong versatility;

(3) The utility model is aimed at the characteristics of small satellites with small volume and narrow operating space. In addition to the inner bending radius measuring ruler, when the inner bending radius cannot be measured due to space interference, the utility model is also equipped with an outer bending radius measuring ruler, which can be used from The cable is measured in two directions, the inner and outer directions in space, which improves the operational feasibility of the cable bending radius measurement on the star;

(4) The inner bending radius measuring stick 4 and the outer bending radius measuring stick 8 of the utility model are all engraved with marks, and the transformation work has been done on the marks. That is, the corresponding bending radius is calculated according to the cable body radius value and requirements. The operator saves the trouble of measuring the radius of the body and then calculating, and can intuitively and quickly select the corresponding bending radius ruler, which improves the inspection efficiency;

(5) This product is small in size, easy to carry, multi-purpose in one foot, and easy to operate. It can simultaneously measure multiple values of the cable body radius, bending radius, and straight-line distance at the root, replacing the need to use rulers, calipers, etc. in previous operations. It reduces the trouble of multiple tools, reduces the risk of bumping caused by multiple tools on the star, and improves operational safety.

Description of drawings

Fig. 1 is the structural diagram of the utility model bending radius measuring ruler;

Figure 2 is a schematic diagram of measuring the bending radius (inner diameter) using the measuring ruler of the present utility model, wherein Figure 2 (a) is a qualified measurement, and Figure 2 (b) is an unqualified measurement;

Figure 3 is a schematic diagram of measuring the bending radius (outer diameter) using the measuring ruler of the present invention, wherein Figure 3 (a) is a qualified measurement, and Figure 3 (b) is an unqualified measurement;

Fig. 4 is the schematic diagram of the cable radius measuring piece of measuring ruler of the present invention;

Fig. 5 is a schematic diagram of measuring the distance of the straight line section of the root with the measuring ruler of the present invention.

Detailed ways

As shown in Figure 1, the utility model is used for measuring the bending radius of the small satellite assembly cable, including a front support plate 2, a rear support plate 3, a measuring piece storage tank 5, an inner bending radius measuring ruler 4, and an outer bending radius measuring ruler 8 and the cable radius measuring sheet 6, the root straight section distance measuring sheet 7. The inner bending radius measuring stick 4 is riveted between the front support plate 2 and the rear support plate 3 by a rivet 1 and is located on the left side, and the outer bending radius measuring stick 8 is riveted between the front support plate 2 and the rear support plate 3 by a rivet 1 and on the right. Measuring sheet storage tank 5 is connected together by fastener 9 and front support plate 2, and measuring sheet storage tank 5 is placed with cable radius measuring sheet 6, root straight line section distance measuring sheet 7.

According to the different types and specifications of the high-frequency, low-frequency and LVDS wires and cables on the star, a total of 25 pieces of the inner bending radius gauge 4, a total of 25 pieces of the outer bending radius gauge 8, a total of 3 pieces of the cable radius gauge 6, and the distance between the straight line at the root are designed. Measure 7 pieces for a total of 1 piece.

The design principle of this tooling is: According to the technical requirements of cable star installation and the requirements of inspection items after star installation, the tooling design includes 4 kinds of measuring rulers, which are used to measure the radius of the high-frequency and low-frequency cables and the inner bending radius after laying. , the outer bending radius, and the straight line distance at the root of the cable. When designing, first of all, according to the current types of cables on the star, determine the number of radius gauges for the cable body. Low frequency (from R2-R20mm, 1mm/1 file), high frequency (from R2-R5mm, 0.5mm/1 file) and LVDS cable (R3.7) radius specifications total 22, if there are more types in the future, it can be increased accordingly Quantity of slices. Then, according to the value of the cable body, calculate the minimum cable bending radius (inner and outer) value corresponding to each specification radius, and make 25 fan-shaped inner and outer diameter measuring pieces respectively. Due to the problem of operating space on the satellite during use, the inner or outer diameter measuring piece is selected and screwed out and placed at the cable bend, so that the qualification of the bending radius can be visually judged. In addition, according to the length requirements of the straight line section at the root of the cable after laying, three types of measuring sheets (15mm, 20mm, 30mm) for high-frequency, low-frequency and LVDS cables are produced. Place the measuring sheet at the root of the cable during measurement. The corresponding engraved line is qualified.

When in use, first take out the cable radius measuring piece 6 placed in the measuring piece storage slot 5, as shown in Figure 4, measure the radius of the cable body, and then classify it according to the high-frequency or low-frequency cables, from the front support plate 2 and the rear support plate 3 Unscrew the inner bending radius measuring ruler 4 of the corresponding cable on the left side, and select the corresponding measuring ruler according to the mark on the ruler to measure the inner bending radius of the cable after laying. If the actual inner bending radius of the cable is greater than or equal to the bending radius of the measuring ruler If it is less than the bending radius of the ruler, it is judged that the cable installation is unqualified. If it is impossible to measure the inner bending radius of the cable due to the influence of the operating space on the star, you can unscrew the outer bending radius measuring ruler 8 of the corresponding cable on the right from between the front support plate 2 and the rear support plate 3, and select the corresponding one according to the mark marked on the ruler. The measuring stick measures the outer bending radius of the cable after laying, and the interpretation method is the same as the inner diameter. Figure 2 and Figure 3 are schematic diagrams for measuring the inner and outer bending radii.

After the bending radius reading, withdraw the measuring stick. Then take out the measuring piece 7 of the straight line section distance at the root in the storage slot 5 of the measuring piece, and judge the distance of the straight line section at the root of the cable according to the mark on it. If it is greater than or equal to the marking line, it is qualified, and if it is less than the marking line, it is unqualified. Figure 5 shows the straight line section at the root. Schematic diagram of distance measurement.

When using the special measuring tool for measuring the bending radius of the small satellite assembly cable of the utility model to measure the bending radius after laying the cable, follow the steps below:

1. Take out the cable radius measuring piece 6 placed in the measuring piece storage slot 5, and measure the radius of the cable body. Put it back in the measuring piece storage tank 5 after measuring;

2. Unscrew the inner bending radius measuring ruler 4 of the corresponding cable on the left from the middle of the front support plate 2 and the rear support plate 3, and select the corresponding measuring ruler according to the mark engraved on the ruler according to the radius of the cable body;

3. Move the inner bending radius gauge 4 to a suitable position directly above the tested cable;

4. Use a measuring stick to measure the inner bending radius of the cable after laying. If the inner diameter cannot be measured, it can be measured with the right outer bending radius measuring stick 8;

5. After the measurement, retract all the measuring rulers on the left and right sides to the front support plate 2 and the rear support plate 3;

6. Take out the measuring piece 7 placed in the measuring piece storage tank 5;

7. Move the straight-line section distance meter 7 at the root to the root of the cable under test;

8. Measure the distance of the straight line section at the root of the cable using the measuring sheet 7 of the straight line section at the root;

9. Put the measuring piece back into the measuring piece storage tank 5 after measurement.

The content that is not described in detail in the description of the utility model belongs to the known technology of those skilled in the art.

Claims (4)

1. A bending radius measuring ruler, characterized in that: it includes a front support plate (2), a rear support plate (3), a measuring piece storage slot (5), an inner bending radius measuring ruler (4), and an outer bending radius measuring ruler (8), the cable radius measuring piece (6) and the distance measuring piece of the straight line at the root (7); the inner bending radius measuring ruler (4) is riveted on the front support plate (2) and the rear support plate (3) by rivets (1) Between and on the left side, the outer bending radius gauge (8) is riveted between the front bracket plate (2) and the rear bracket plate (3) and on the right side through the rivet (1); the measuring piece storage slot (5) passes through The fastener (9) is connected to the front bracket plate (2), and the cable radius measuring piece (6) and the root straight section distance measuring piece (7) are placed in the measuring piece storage slot (5); the inner bending radius measurement The ruler (4) includes at least one fan-shaped sheet with a known radius, and the outer bending radius measuring ruler (8) also includes at least one fan-shaped sheet with a known radius, and the cable radius measuring sheet (6) leaves a A rectangular sheet with an opening of an arc segment with a known radius, and the distance measuring sheet (7) of the straight line section at the root is a bar-shaped sheet with a size scale. 2. A bending radius measuring ruler according to claim 1, characterized in that the number of fan-shaped thin slices contained in the inner bending radius measuring ruler (4) or the outer bending radius measuring ruler (8) is 25. 3. A bending radius measuring ruler according to claim 1, characterized in that: the number of said cable radius measuring pieces (6) is 3, including 22 openings in arc segments. 4. A bending radius measuring ruler according to claim 1, characterized in that: there is one measuring piece (7) for the straight-line distance at the root, and there are three scales, and the three scales correspond to low-frequency cables respectively , high-frequency cables, and LVDS cables are required to have a straight-line distance at the root after the laying is completed.

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