CN217058811U - Level gauge with constant relative error - Google Patents
Level gauge with constant relative error Download PDFInfo
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- CN217058811U CN217058811U CN202220025800.9U CN202220025800U CN217058811U CN 217058811 U CN217058811 U CN 217058811U CN 202220025800 U CN202220025800 U CN 202220025800U CN 217058811 U CN217058811 U CN 217058811U
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- relative error
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Abstract
The utility model provides a level gauge that relative error is invariable relates to level gauge design technical field. This spirit level that relative error is invariable includes base and main air level pipe, and main air level pipe sets up in the base, and main air level pipe is provided with the cavity that is used for holding liquid, and the roof of cavity is the curved surface, and the projection of curved surface on predetermineeing the plane is for predetermineeing the curve, predetermines the length direction that the plane is on a parallel with main air level pipe, predetermines curved equation as follows: (x) a-a.e cx . By using such a methodFormula setting, this spirit level that relative error is invariable has solved the problem that can both measure from the short range to the wide range, and relative error is invariable when measuring. The method can be popularized and applied to deformation monitoring of structures such as bridges and culverts, aqueducts and the like and slope monitoring of geological disasters such as side slopes and landslides.
Description
Technical Field
The utility model discloses spirit level design technical field particularly, relates to a invariable spirit level of relative error.
Background
The level gauge is a small-angle measurement precision device, is widely applied to the fields of machine tool installation, high-precision test instrument leveling and the like, and is an important measuring tool. The level gauge is generally composed of a sub level tube and a high precision level tube, the precision of the sub level tube is controlled by the curvature radius of the curved surface of the main level tube, liquid is filled in the level tube, and when the level gauge inclines, air bubbles in the level tube move to the rising end of the level gauge, so that the position of the level gauge is determined. The greater the radius of curvature of the inner wall of the levelling tube, the higher the resolution, and the smaller the radius of curvature, the lower the resolution, and therefore the radius of curvature of the levelling tube determines the accuracy of the spirit level.
The traditional level meter is mainly used for detecting whether the reference of instruments, machine tools and the like is horizontal, the curved surface of the level pipe adopts an arc surface, and in order to achieve the second-level angle precision, an arc with a large curvature radius is selected, so that the measuring range (measuring range) is small.
SUMMERY OF THE UTILITY MODEL
The utility model provides a spirit level that relative error is invariable through being provided with the cavity that is used for holding liquid with main air level, and the roof of cavity sets up to the curved surface, and the projection of curved surface on predetermineeing the plane is for predetermineeing the curve, predetermines the length direction that the plane is on a parallel with main air level, predetermines curved equation as follows: (x) a-a.e cx . The method can solve the contradiction between the measuring range (measuring range) and the error, and realize the application of the level meter with constant relative error in the measurement of larger angles.
The embodiment of the utility model is realized like this:
in a first aspect, the present invention provides a level gauge with constant relative error, including:
a base;
the main air level pipe sets up in the base, and main air level pipe is provided with the cavity that is used for holding liquid, and the roof of cavity is the curved surface, and the projection of curved surface on predetermineeing the plane is for predetermineeing the curve, predetermines the length direction that the plane is on a parallel with main air level pipe, predetermines curvilinear equation as follows:
f(x)＝a-a·e cx
wherein x is an abscissa, f (x) is an ordinate, a and c are constants, and e is a natural constant.
In an alternative embodiment, the primary level tube is connected to the base by a first threaded member, which is used to calibrate the primary level tube.
In an optional embodiment, the base is provided with a through hole for the first screw to pass through.
In an alternative embodiment, the primary level vial is disposed along the length of the base.
In an alternative embodiment, the level with constant relative error further comprises a secondary leveling tube arranged on the base and used for selecting the direction of the inclination angle during measurement.
In an alternative embodiment, the secondary level tube is connected to the base by a second threaded member that is used to calibrate the secondary level tube.
In an alternative embodiment, the secondary levelling tubes are arranged in the width direction of the base, perpendicular to the primary levelling tubes.
In an optional embodiment, the level gauge with a constant relative error further comprises an upper cover, the upper cover is arranged on the base, the upper cover is of a hollow structure, and a space for accommodating the main leveling tube and the auxiliary leveling tube is formed by the upper cover and the base together.
In an optional embodiment, the top of the upper cover is provided with an observation window for observing the conditions of the main level pipe and the auxiliary level pipe.
In an alternative embodiment, the curved surface is provided with graduation marks.
The embodiment of the utility model provides a beneficial effect is:
the level gauge with constant relative error comprises a base and a main leveling tube arranged at the bottomThe seat, main water level pipe are provided with the cavity that is used for holding liquid, and the roof of cavity is the curved surface, and the projection of curved surface on predetermineeing the plane is for predetermineeing the curve, predetermines the length direction that the plane is on a parallel with main water level pipe, predetermines curvilinear equation as follows: (x) a-a.e cx . The arrangement of the curved surface can ensure that the relative error is constant during measurement, is suitable for large-angle measurement, and solves the contradiction between the measurement range (measuring range) and the error.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a level with a constant relative error according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a main level pipe according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of the main level along a predetermined plane according to an embodiment of the present invention.
Icon: 1-level with constant relative error; 10-presetting a plane; 11-a preset curve; 20-a base; 30-a primary level tube; 301-a first connection; 302-a second connection; 303-a third connecting portion; 304-a fourth connection; 305-a fifth connection; 306-a top wall; 40-auxiliary level pipe; 50-upper cover; 60-observation window; 1000-a first threaded member; 2000-second screw.
Detailed Description
The level meter is a small-angle measurement precision device, and if the measurement range (range) is to be enlarged, a smaller curvature radius circular arc is selected, but the angle resolution of small-angle measurement is greatly reduced, and the relative error and the absolute error in the small-angle measurement are greatly increased.
The utility model provides a spirit level that relative error is invariable has solved the contradiction between measuring range (range) and the error, and relative error when reducing the measurement realizes the application of spirit level in great angular surveying.
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the present embodiment provides a level 1 with a constant relative error, which includes a base 20 and a main leveling tube 30, wherein the main leveling tube 30 is disposed on the base 20, the main leveling tube 30 is provided with a cavity for containing liquid, and a top wall 306 of the cavity is a curved surface. In this embodiment, the base 20 is the bearing part of the spirit level 1 with a constant relative error, various parts of the spirit level 1 with a constant relative error are borne on the base, the main level pipe 30 is arranged on the base 20, specifically, the main level pipe 30 is connected to the base 20 through the first screw 1000, the first screw 1000 is used for calibrating the main level 30, the main level pipe 30 is arranged along the length direction of the base 20, and is in contact with the upper surface of the base 20, the base 20 is provided with a through hole for the first screw 1000 to penetrate through, through holes for the first screw 1000 to penetrate through are respectively arranged at two ends of the main level pipe 30, when the first screw 1000 penetrates through the through hole, the spirit level 1 with a constant relative error can be positioned on a plane to be measured, and the calibration of the spirit level 1 with a constant relative error can be realized by adjusting the first screw 1000.
Fig. 2 is a schematic structural diagram of the main level tube 30, the main level tube 30 includes a first connecting member, the first connecting member includes a first connecting portion 301, a second connecting portion 302, a third connecting portion 303, a fourth connecting portion and a fifth connecting portion, the first connecting portion 301 is connected to the base 20 through a first screw 1000, the second connecting portion 302 and the third connecting portion 303 are relatively disposed at two sides of the first connecting portion 301, a fourth connecting portion 304 and a fifth connecting portion 305 are relatively disposed at two ends of the first connecting portion 301, the second connecting portion 302, the third connecting portion 303, the fourth connecting portion 304, the fifth connecting portion 305 and the top wall 306 together enclose a chamber for accommodating liquid.
In this embodiment, the main level tube 30 is surrounded by a first connection portion 301, a second connection portion 302, a third connection portion 303, a fourth connection portion 304, a fifth connection portion 305, and a top wall 306, the first connection portion 301 has a rectangular structure, and threaded holes in the main level tube 30 are opened at both ends of the first connection portion 301, so as to position the main level tube 30 on the base 20 and have a function of aligning the main level tube 30. The second connecting part 302 and the third connecting part 303 are oppositely arranged along the length direction of the first connecting part 301 and are perpendicular to the first connecting part 301; fourth connecting portion 304 and fifth connecting portion 305 set up along first connecting portion 301 width direction relatively, and all perpendicular to first connecting portion 301, and second connecting portion 302, third connecting portion 303, fourth connecting portion 304 and fifth connecting portion 305 all set up in the upper surface of first connecting portion 301, and the other end is the arc limit with the part of roof 306 contact, sets up and cooperatees with the curved surface of roof 306 to enclose into the cavity that holds liquid jointly.
The projection of the curved surface on the preset plane 10 is a preset curve 11, the preset plane 10 is parallel to the length direction of the main leveling pipe 30, the curved surface of the chamber top wall 306 is set according to actual needs, in this embodiment, the equation of the preset curve 11 is as follows:
f(x)＝a-a·e cx
wherein x is an abscissa, f (x) is an ordinate, a and c are constants, e is a natural constant, and c determines the magnitude of the relative error.
Referring to fig. 3, in this embodiment, the preset plane 10 is a plane of the pattern marked with "x, f (x)" in fig. 3, that is, a plane extending along the x direction and the f (x) direction wirelessly, the preset plane 10 is parallel to the length direction of the main leveling pipe 30, the curved surface is projected on the plane to form a preset curve 11, and the preset curve 11 is set as an exponential function curve, so that the relative error is not changed, and the specific mathematical principle is as follows:
let y be f (x), and x be the abscissa, for the curved surface equation of the chamber top wall 306 of the primary leveling tube 30. Then the relative error coefficient for the angle corresponding to x is f '(x), and f ″ (x)/f' (x), so that the relative error is constant, the relative error coefficient should be constant, that is, the following equation is satisfied:
f″(x)-cf′(x)＝0
the solution of this equation is f (x) a-a.e cx Then, when the bubble center in the chamber is located at x, the measured angle value is θ ═ f' (x) | ═ ace cx And marking the scale on the scale of the corresponding x, and reading the scale at the center of the bubble to obtain the inclination angle measured by the current equipment. The product ac of the coefficients a, c determines the device resolution for the main level tube 30 at x equal to 0, and the coefficient c determines the magnitude of the relative error.
It has been calculated that a typical parameter for a curved surface is 0.00025 and c 0.04, which results in a level 1 with a constant relative error with a zero resolution of 0.01mm/m and a measurement range of 0.01mm/m to 1.2 mm/m. In other embodiments, the change of the measurement range and the measurement relative error can be realized by adjusting the coefficients a and c.
The curved surface is arranged by adopting the negative exponential function mode, so that the relative error is constant during measurement, and large-angle measurement can be performed under the condition that the relative error is acceptable.
The main level pipe 30 is provided with corresponding scales according to an exponential function, and particularly, the curved surface is provided with scale marks, so that the inclination angle value can be read through the scale marks.
The level 1 with constant relative error further comprises an auxiliary leveling tube 40 arranged on the base 20 and used for selecting the direction of the inclination angle during measurement. The auxiliary leveling tube 40 is a conventional leveling tube and is used for selecting the direction of the maximum inclination angle during measurement, the auxiliary leveling tube 40 comprises a bottom surface and peripheral side surfaces, the bottom surface and the side surfaces jointly enclose a cavity for containing liquid, air bubbles are arranged on the surface of the liquid in the cavity, and during actual operation, whether the air bubbles are located in the middle of the auxiliary leveling tube 40 is observed, so that the inclination angle direction during measurement is judged.
The secondary leveling tube 40 is connected to the base 20 through a second screw 2000, the second screw 2000 is used for calibrating the secondary leveling tube 40, a through hole for the second screw 2000 to penetrate is formed in the bottom surface of the secondary leveling tube 40, and the secondary leveling tube 40 is calibrated through the second screw 2000.
The sub level tube 40 is provided along the width direction of the base 20 and is perpendicular to the main level tube 30. The sub level pipe 40 is smaller than the main level pipe 30, and in this embodiment, the sub level pipe 40 is provided in a direction perpendicular to the main level pipe 30 at a predetermined interval, and the sub level pipe 40 is also provided with a limit scale for observing the inclination direction of the level 1 with a constant relative error.
The level 1 with a constant relative error further includes an upper cover 50 disposed on the base 20, wherein the upper cover 50 has a hollow structure and forms a space for accommodating the main leveling tube 30 and the sub leveling tube 40 together with the base 20. The upper cover 50 comprises a top plate, a first side plate, a second side plate, a third side plate and a fourth side plate, one end of the first side plate is connected with the second side plate, one end, far away from the first side plate, of the second side plate is connected with the third side plate, the third side plate is perpendicular to the second side plate, the first side plate is perpendicular to the second side plate, the third side plate and the first side plate are arranged on the second side plate in the same direction, one end, far away from the second side plate, of the third side plate is connected with the fourth side plate, the other end of the fourth side plate is connected with the first side plate, the top plate is respectively attached to the upper edges of the first side plate, the second side plate, the third side plate and the fourth side plate, the basic structure of the upper cover 50 is formed, the upper cover 50 is connected with the base 20 through a threaded structure, a space is formed jointly, and the space is used for placing the main leveling pipe 30 and the auxiliary leveling pipe 40.
An observation window 60 is opened at the top of the upper cap 50 for observing the state of the main leveling tube 30 and the sub leveling tube 40. In this embodiment, the top plate of the upper cover 50 is provided with two observation windows 60, which are a main observation window 60 and an auxiliary observation window 60, respectively, the main observation window 60 is opened above the main leveling pipe 30, the auxiliary observation window 60 is opened above the auxiliary leveling pipe 40, inner walls of the main observation window 60 and the auxiliary observation window 60 are both arc-shaped structures, the size of the main observation window 60 is consistent with the size of the main leveling pipe 30, and the size of the auxiliary observation window 60 is consistent with the size of the auxiliary leveling pipe 40.
The principle and process of operation of the level 1 with constant relative error in this embodiment are as follows:
the level 1 with constant relative error is installed at a position needing to be leveled or deformation monitoring is carried out, firstly, a main level pipe 30 and an auxiliary level pipe 40 are respectively fixed on a base 20 through a first threaded part 1000 and a second threaded part 2000, an upper cover 50 is covered, the position change of air bubbles in the main level pipe 30 and the auxiliary level pipe 40 is observed, the leveling of the level 1 with constant relative error is realized through respectively adjusting the first threaded part 1000 and the second threaded part 2000, namely, the air bubbles are positioned at the middle position of the main level pipe 30 and the auxiliary level pipe 40, and after the level 1 with constant relative error is arranged at a specified position, the deformation of structures such as bridges, aqueducts and the like and the inclination of disasters such as side slopes, landslides and the like can be monitored through an observation window 60.
This level 1 that relative error is invariable includes base 20 and main air level 30, and main air level 30 sets up in base 20, and main air level 30 is provided with the cavity that is used for holding liquid, and the roof 306 of cavity is the curved surface. This spirit level 1 that relative error is invariable is owing to set up the roof 306 of main water level 30 cavity as the curved surface, and the curve that the curved surface corresponds sets up to the exponential function, can enlarge measuring range (range), and relative error is invariable when this curved surface can guarantee to measure, has solved the contradiction between measuring range (range) and the error, realizes the application of spirit level 1 that relative error is invariable in great angle measurement, and can popularize and be applied to the deformation monitoring of structures such as bridge culvert, aqueduct and slope monitoring of geological disasters such as side slope, landslide.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A level having a constant relative error, comprising:
a base;
the main air level pipe, set up in the base, the main air level pipe is provided with the cavity that is used for holding liquid, the roof of cavity is the curved surface, the projection of curved surface on predetermineeing the plane is for predetermineeing the curve, predetermine the plane and be on a parallel with the length direction of main air level pipe, predetermine curvilinear equation as follows:
f(x)＝a-a·e cx
wherein x is an abscissa, f (x) is an ordinate, a and c are constants, and e is a natural constant.
2. The level of claim 1, wherein the primary level tube is connected to the base by a first threaded member, the first threaded member being used to calibrate the primary level tube.
3. The level gauge with the constant relative error according to claim 2, wherein the base is provided with a through hole for the first screw to pass through.
4. The constant relative error level of claim 1, wherein the primary levelling tube is disposed along the length of the base.
5. The level of claim 1, further comprising a secondary leveling tube disposed at the base for selecting the direction of the tilt angle during measurement.
6. The level of claim 5, wherein the secondary levelling tube is connected to the base by a second screw for aligning the secondary levelling tube.
7. The level of claim 6, wherein the secondary levelling tube is arranged along the width of the base and perpendicular to the primary levelling tube.
8. The level of claim 5, further comprising an upper cover disposed on the base, wherein the upper cover is hollow and forms a space with the base for accommodating the primary and secondary leveling tubes.
9. The level of claim 8, wherein the top of the top cap defines a viewing window for viewing the primary and secondary vials.
10. The level of constant relative error of claim 1, wherein the curved surface has graduation marks disposed thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220025800.9U CN217058811U (en) | 2022-01-06 | 2022-01-06 | Level gauge with constant relative error |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220025800.9U CN217058811U (en) | 2022-01-06 | 2022-01-06 | Level gauge with constant relative error |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217058811U true CN217058811U (en) | 2022-07-26 |
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ID=82482252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220025800.9U Active CN217058811U (en) | 2022-01-06 | 2022-01-06 | Level gauge with constant relative error |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217058811U (en) |
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2022
- 2022-01-06 CN CN202220025800.9U patent/CN217058811U/en active Active
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