CN215261584U

CN215261584U - Poor measuring device of bending of levelling staff

Info

Publication number: CN215261584U
Application number: CN202121123594.7U
Authority: CN
Inventors: 吕健; 许明元; 马庆尊; 孟庆筱; 党学会
Original assignee: FIRST MONITORING CENTER OF CHINA EARTHQUAKE ADMINISTRATION
Current assignee: FIRST MONITORING CENTER OF CHINA EARTHQUAKE ADMINISTRATION
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-12-21
Anticipated expiration: 2031-05-24

Abstract

The utility model discloses a poor measuring device of bending of levelling staff, including the fixed tongs in upper end, steel wire tightener, steel wire, the fixed tongs of lower extreme and depth chi, steel wire tightener one end is passed through the couple and is connected with the fixed tongs in upper end, and the other end is connected with the steel wire through the couple, the other end of steel wire through the couple with the fixed tongs of lower extreme is connected. Particularly, the steel wire with the diameter of 0.3mm and the tensile strength of 2060MPa or more is adopted to replace the rough sewing thread with the diameter of about 1mm, so that the error caused by the bending of the sewing thread can be effectively avoided; a depth ruler with the measurement precision of 0.1mm is used for replacing a straight ruler with the minimum division of 1mm, so that the measurement precision is improved by one order of magnitude; the operation is simple, only 1 person is needed, and the labor is saved. The utility model discloses structural design is simple reasonable, uses convenient operation swift, has very high practicality.

Description

Poor measuring device of bending of levelling staff

Technical Field

The utility model relates to a measuring device field especially relates to a poor measuring device of bending of levelling staff.

Background

At present, when the bending difference of the leveling staff is measured in actual work, a sewing line is usually adopted, a fine straight line distance formed by a dividing plane and the sewing line is measured, a ruler with the minimum division of 1mm is generally used, and the reading is required to be estimated to be 0.2 mm. However, the sewing thread has limited tensile strength, so that certain bending still exists after the two ends of the staff gauge are tensioned; the diameter of the sewing thread is generally about 1mm, so that the estimation of 0.2mm is difficult; the measurement accuracy of the ruler is limited and needs to be estimated and read, so that the measurement accuracy is not high; at least three persons are needed to cooperate in the work, which causes certain waste of the personnel.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a poor measuring device of bending of levelling rod to solve the aforementioned problem that exists among the prior art.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

the bending difference measuring device of the leveling staff is characterized by comprising an upper end fixing hand grip, a steel wire tightener, a steel wire, a lower end fixing hand grip and a depth gauge, wherein one end of the steel wire tightener is connected with the upper end fixing hand grip through a hook, the other end of the steel wire is connected with the steel wire through a hook, and the other end of the steel wire is connected with the lower end fixing hand grip through a hook.

Further, the steel wire has a tensile strength of 2060MPa or more with a diameter of 0.3 mm.

Further, the depth gauge 5 is 0.1mm in minimum division.

The utility model has the advantages that:

the utility model discloses structurally the design is simple reasonable, uses convenient operation swift, and the practicality is very high. The steel wire with the diameter of 0.3mm and the tensile strength of 2060MPa or more is adopted to replace the rough sewing thread with the diameter of about 1mm, and the steel wire is tightened by a tightener, so that the error caused by the bending of the sewing thread can be effectively avoided; the distance from the graduation surface of the leveling staff to the sewing line is estimated according to the position of the sewing line on the straight ruler originally, the measurement error is in millimeter level, and the distance from the graduation surface of the leveling staff to the upper edge of the steel wire can be read only by clamping the depth gauge to the upper edge of the steel wire after improvement; the depth ruler with the measurement precision of 0.1mm replaces a straight ruler with the minimum division of 1mm, the comprehensive measurement precision reaches 0.1mm, the measurement precision is improved by one order of magnitude, and if the bending difference exceeds 4mm, the correction precision can also be improved when the length of the ruler is corrected; the invention has simple operation and only needs 1 person, thereby saving manpower.

Drawings

FIG. 1 is a schematic structural view of a bending difference measuring apparatus of a leveling staff according to the present invention;

in the figure, 1-upper end fixed hand grip, 2-steel wire tightener, 3-steel wire, 4-lower end fixed hand grip, 5-depth gauge and 6-leveling staff.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only.

As shown in fig. 1, the utility model discloses the example shows a poor measuring device of crooked of levelling staff, including the fixed tongs 1 of upper end, steel wire tightener 2, steel wire 3, the fixed tongs 4 of lower extreme and

depth chi

5, 2 one end of steel wire tightener through the couple with the fixed tongs 1 of upper end is connected, the other end through the couple with steel wire 3 is connected, the other end of steel wire 3 through the couple with the fixed tongs 4 of lower extreme is connected.

Preferably, the steel wire 3 has a tensile strength of 2060MPa or more at a diameter of 0.3 mm.

Preferably, the depth gauge 5 has a minimum division of 0.1 mm.

The method for measuring the bending difference of the dividing plane of the leveling staff is specified in national first-class and second-class leveling Specification GBT.12897-2006: a thin straight line is stretched through two ends of the scale, and the distance between the two ends and the center of the scale surface of the scale is measured to the thin straight line.

The scale bending difference f is calculated according to equation (1):

f＝R_in-(R_{On the upper part}+R_{Lower part})/2 (1)

In the formula:

R_in-intermediate readings in millimeters (mm);

R_{on the upper part}Upper end reading in millimeters (mm);

R_{lower part}Lower end reading in millimeters (mm).

When the nominal meter length measurement value is the arc length of the ruler tape, f is not more than 4mm, otherwise the length L should be corrected according to the formula (2):

L＝L'-8 f²/(3L') (2)

where L' is the nominal length of the scale in millimeters (mm).

During measurement, the upper end fixing hand 1 is fixed at the upper end of the leveling staff 6, the lower end fixing hand 4 is fixed at the lower end of the leveling staff 6, the steel wire tightener 2 is slowly tightened to tighten the steel wire 3, the depth gauge 5 is used for measuring the distances from the upper edge of the steel wire 3 to the dividing plane of the leveling staff at the upper end, the middle part and the lower end of the leveling staff 6 respectively, and the staff bending difference is calculated according to the formula (1).

Through adopting the utility model discloses an above-mentioned technical scheme has obtained following profitable effect:

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be viewed as the protection scope of the present invention.

Claims

1. The bending difference measuring device of the leveling staff is characterized by comprising an upper end fixing hand grip, a steel wire tightener, a steel wire, a lower end fixing hand grip and a depth gauge, wherein one end of the steel wire tightener is connected with the upper end fixing hand grip through a hook, the other end of the steel wire is connected with the steel wire through a hook, and the other end of the steel wire is connected with the lower end fixing hand grip through a hook.

2. A bending difference measuring apparatus according to claim 1, wherein the steel wire has a tensile strength of 2060MPa or more in a diameter of 0.3 mm.

3. A differential bending measurement device according to claim 1, in which the depth gauge employs a minimum division of 0.1 mm.