Level measuring device based on equal gravity surface

Abstract

The utility model provides a leveling device based on an equal gravity surface, which comprises two observation rulers communicated with each other, and each observation ruler comprises a measuring pipe body filled with a liquid medium, and a first pressure sensor and a second pressure sensor both used for measuring the pressure of the liquid medium, the second pressure sensor is arranged at the bottom of the measuring pipe body, the first pressure sensor is arranged above the second pressure sensor, and the height distance between the first pressure sensor and the second pressure sensor is a constant. According to the utility model, the first pressure sensor and the second pressure sensor are arranged in the observation ruler, so that the density of a liquid medium can be solved in real time, the liquid level height can be reversely deduced, the problems of accurate measurement and digital recording of the liquid level height are ingeniously solved, and the influence of temperature on the measurement precision is eliminated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of leveling instrument, concretely relates to a leveling device based on equipotential surface. BACKGROUND

[0002] The principle of leveling is to use the horizontal line of sight provided by the level to determine the height difference between two points on the ground, and then to calculate the height of the unknown point from the known point. In actual measurement, if the distance between the measurement point and the reference point is long or the height difference is large, several transfer points need to be set between the two points to measure the height difference in sections, and then the height of the measurement point is calculated based on the height of the reference point and the total height difference.

[0003] Leveling is widely used in various engineering construction fields, but the conventional leveling device has the following defects: (1) the measurement process is complicated and inefficient. Traditional optical leveling requires manual reading of the readings on the leveling rod and manual recording of the data. Two people are needed to keep the front and rear leveling rods at equal distances. Generally, three to four people are needed to complete the leveling operation. The whole process is time-consuming and labor-intensive. (2) The traditional leveling requires clear line of sight between the front and rear, and accurate reading is not possible in too bright or too dark light. Enough space is also needed to set up the rod for observation. (3) The measurement error cannot be eliminated. Although the accuracy of modern levels has been greatly improved, the height needs to be transmitted in sections, so any small error will be magnified through each measurement. Systematic errors such as zero point error of the leveling rod, reading error, leveling rod tilt error, i angle error of the instrument (angle between the collimation axis and the level tube axis) etc.

[0004] In view of the above, there is an urgent need for a leveling device based on equipotential surface to solve the problems in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a leveling device based on equipotential surface, which aims to solve the deficiencies of conventional leveling devices. The specific technical solution is as follows:

[0006] A leveling device based on equipotential surface, comprising two observation rods connected to each other, the observation rod comprising a measuring tube body containing a liquid medium and a first pressure sensor and a second pressure sensor for measuring the pressure of the liquid medium, the second pressure sensor being arranged at the bottom of the measuring tube body, the first pressure sensor being arranged above the second pressure sensor, and the height distance between the first pressure sensor and the second pressure sensor being a constant.

[0007] In the above technical solution, the upper opening of the measuring tube body is in communication with the atmosphere.

[0008] Preferably, in the above technical scheme, the third observation ruler is connected with the two observation rulers, and two of the three observation rulers are arranged at two measuring locations, and the remaining one is arranged at any position between the two measuring locations.

[0009] Preferably, in the above technical scheme, the two observation rulers are connected by a connecting hose.

[0010] Preferably, in the above technical scheme, the connecting hose is wound and unwound by a reel.

[0011] The technical scheme of the utility model has the following beneficial effects:

[0012] The liquid medium can flow freely between the observation rulers, and finally stops at the isogravity surface, at which time the liquid levels of the observation rulers are at the same height, but the liquid levels in the observation rulers are inconsistent, the liquid level in each observation ruler is calculated by the pressure sensor in the observation ruler, and the height difference between the two measuring locations is obtained.

[0013] The utility model discloses a leveling device, which avoids the error transmission caused by the i angle error of the level, the error caused by the inclination of the leveling ruler, the measurement error caused by the human reading error of the optical level, and the problem of not being able to collect data due to insufficient or too bright light.

[0014] The utility model discloses a leveling device, which avoids the error transmission caused by the i angle error of the level, the error caused by the inclination of the leveling ruler, the measurement error caused by the human reading error of the optical level, and the problem of not being able to collect data due to insufficient or too bright light.

[0015] The utility model discloses a leveling device, which avoids the error transmission caused by the i angle error of the level, the error caused by the inclination of the leveling ruler, the measurement error caused by the human reading error of the optical level, and the problem of not being able to collect data due to insufficient or too bright light.

[0016] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The utility model will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are provided to explain the present application and are not meant to limit the present application. In the drawings:

[0018] Figure 1 is a structural schematic view of the observation ruler;

[0019] Figure 2 is a measurement schematic view of three observation rulers arranged in front, middle and back;

[0020] Among them, 1, the measuring tube body, 2, the liquid medium, 3, the first pressure sensor, 4, the second pressure sensor, 5, the communication hose, 6, the reel. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present application, the present application will be described more fully below, and the preferred embodiments of the present application are given. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0023] Embodiment:

[0024] Referring to Figures 1-2 The present embodiment provides a leveling device based on isogravimetric surface (i.e. a height difference measuring device), which comprises two observation rulers in communication with each other, the observation ruler comprises a measuring tube body 1 containing a liquid medium 2 and a first pressure sensor 3 and a second pressure sensor 4 for measuring the pressure of the liquid medium 2, the second pressure sensor 4 is arranged at the bottom of the measuring tube body 1, the first pressure sensor 3 is arranged above the second pressure sensor 4, and the height distance L between the first pressure sensor 3 and the second pressure sensor 4 is constant.

[0025] The measuring device of the embodiment can measure the height difference between two measuring locations. Since the two observation tubes are connected to each other, the liquid level of the liquid medium 2 in the two observation tubes is located on the same gravity equipotential surface (i.e. the gravity equipotential surface or the level surface) under the action of gravity, and the height difference H of the liquid level of the two observation tubes is the height difference between the two measuring locations. Further, since the two pressure sensors are arranged in the observation tube and the height distance L between the two pressure sensors is a constant (i.e. a known value), the liquid level in the observation tube can be calculated without obtaining the density of the liquid medium in advance, which eliminates the measurement error caused by the change of the density of the liquid medium due to the temperature.

[0026] Referring to Figure 1 According to common sense, the pressure values of the first pressure sensor 3 and the second pressure sensor 4 and the liquid level have the following relationships respectively:

[0027] P1 = ρg(H-L) (1),

[0028] P2 = ρgH (2),

[0029] wherein P1 is the pressure value of the first pressure sensor, P2 is the pressure value of the second pressure sensor, g is the acceleration of gravity, ρ is the density of the liquid medium, H is the liquid level in the observation tube, and L is the height distance between the first pressure sensor and the second pressure sensor.

[0030] The density of the liquid medium is expressed by formula (1) and formula (2):

[0031]

[0032] After obtaining the density of the liquid medium, the liquid level H can be calculated as:

[0033]

[0034] Therefore, the liquid level in the observation tube can be calculated without knowing the density of the liquid medium in advance, which avoids the problem of measurement error of the liquid level caused by the change of the temperature.

[0035] Further, the upper opening of the measuring tube 1 is connected to the atmosphere, which ensures that the liquid level of each observation tube is located on the same level surface (i.e. the gravity equipotential surface).

[0036] Further, in order to improve the measurement accuracy and stability of the measuring device, the measuring device can further comprise a temperature sensor arranged in the observation tube. Figure 2As shown, the leveling device in this embodiment also includes a third observation rod. During measurement, two of the three observation rods are set at two measurement locations respectively, and the remaining observation rod is set at any position between the two measurement locations. Furthermore, the three observation rods need to be connected to allow the liquid medium 2 to flow freely between them. In this embodiment, the measuring tubes 1 of adjacent observation rods are connected to each other. The leveling device in this embodiment can verify the measured elevation difference data according to the principle of segmented elevation difference to ensure that the measured elevation difference data is accurate.

[0037] See Figure 2 The positions of the three observation rulers from left to right are denoted as A, B, and C, where points A and C are two measurement locations, and the liquid level heights on the three observation rulers are H, respectively. a H b H c The process of verifying the elevation difference data in this embodiment is as follows:

[0038] The elevation difference between points A and B is: H ab =H a -H b ;

[0039] The elevation difference between points B and C is: H bc =H b -H c ;

[0040] The elevation difference between points A and C is: H ac =H a -H c ;

[0041] If |H ac -H ab -H bc If |≤α, then the elevation difference data verification is qualified, and elevation difference data acquisition can proceed (i.e., acquiring the elevation difference H between two measurement locations). ac If |H ac -H ab -H bc If |>α, it means that the liquid level has not yet reached the isogravity surface or other errors have occurred, and height difference data cannot be collected at this time; where α is a set threshold, the value of which can be selected based on experience.

[0042] Furthermore, such as Figure 2 As shown, in this embodiment, the measuring tubes 1 of the two observation rulers are connected by a connecting hose 5; the connecting hose 5 is wound up and down by a reel 6, which facilitates the operation of the inspection personnel and improves the efficiency of the operation.

[0043] Preferably, in order to facilitate the observation of the liquid level, the liquid medium 2 should not be a transparent liquid, and a colored liquid should be selected.

[0044] The preferred embodiments of the present application have been described above with the preferred embodiments, but are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A leveling device based on equipotential surfaces, characterized in that, The utility model discloses a two intercommunicate observation ruler, which comprises a measuring tube body (1) containing liquid medium (2) and a first pressure sensor (3) and a second pressure sensor (4) for measuring the pressure of the liquid medium (2), the second pressure sensor (4) is arranged at the bottom of the measuring tube body (1), the first pressure sensor (3) is arranged above the second pressure sensor (4), and the height distance between the first pressure sensor (3) and the second pressure sensor (4) is constant.

2. The isogravity-based leveling device of claim 1, wherein, The upper opening of the measuring tube body (1) is communicated with the atmosphere.

3. The isogravity-based leveling device of claim 1, wherein, A third observation ruler is further included, and the three observation rulers are communicated.

4. The isogravimetric leveling apparatus according to any one of claims 1 to 3, wherein During measurement, two of the three observation rulers are arranged at two measurement sites respectively, and the remaining one is arranged at any position between the two measurement sites.

5. The isogravity-based leveling device of claim 4, wherein, The measuring tube bodies (1) of the two observation rulers are communicated through a communication hose (5). The communication hose (5) is wound and unwound through a reel (6).

Images