Composite length datum line for height transmission instrument
By using a composite length reference line of ultra-in-watt alloy wire and positive temperature coefficient wire in the transmission gear, combined with the welding connection structure, temperature self-compensation is achieved, the error problem caused by ambient temperature changes is solved, and the measurement accuracy is improved Spend.
Patent Information
- Application Number
- CN202420408323.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-04
AI Technical Summary
The length reference line of the existing transmission gauge will produce errors when the ambient temperature changes, and the existing solutions increase system complexity and cannot accurately reflect the temperature changes of the length reference line.
A composite length reference line including an ultra-in-watt alloy wire and a metal wire with a positive temperature coefficient is adopted, and an outer connection cylinder is set up through the welding connection, and the welding seam is fixedly connected to form an ultra-in-watt wire with a negative temperature coefficient and a positive temperature coefficient. The metal wire combination achieves self-compensation of temperature.
The error of temperature changes on the measurement of the altitude meter is significantly reduced and the measurement accuracy is improved.
Smart Images
Figure CN222144125U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of earth observation, in particular to a composite length reference line used for a height transmitter. Background Art
[0002] Deformation monitoring of hydropower dams is an important part of dam safety monitoring. Concrete dams in particular generally have observation corridors inside the dam. The vertical deformation monitoring of the observation corridor inside the dam should meet the plane coordinates and level elevations used for deformation monitoring, and should be consistent with the designed control network coordinate system. Conditional projects should establish a connection with the national control network coordinate system. The elevation observation of the observation corridor faces the problem of transferring the elevation of the dam top or dam foundation connected to the control network to the observation corridor.
[0003] Existing height transmitters are installed in the observation gallery to transmit the elevation of the dam top or dam foundation in connection with the control network to the observation gallery. Figure 4 As shown, the existing height transmitter includes: an upper elevation point coupling device 41, a length reference line 42, an elevation transfer CCD measuring instrument 43, a lower elevation point coupling device 44, a damping oil barrel 45 and a weight 46. The elevation transfer CCD measuring instrument 43 is installed on the lower elevation point coupling device 44, the upper end of the length reference line 42 is installed on the upper elevation point coupling device 41, the lower end of the length reference line 42 is connected to the weight 46, the part between the upper end and the lower end of the length reference line 42 passes through the measuring area of the elevation transfer CCD measuring instrument 43, and a marker pole 47 is also installed on the length reference line 42 in the measuring area, and the weight 46 is set in the damping oil barrel 45. The length reference line 42, the weight 46 and the damping oil barrel 45 constitute the measuring reference line. Since the marker pole 47 on the length reference line 42 is placed in the optical path, which is formed by the light source irradiating the CCD receiver 48 of the elevation transfer CCD measuring instrument 43, the shadow of the marker pole 47 is projected onto the CCD receiver 48 in the elevation transfer CCD measuring instrument 43, and is recognized, processed, and quantified by the CCD into data corresponding to the position of the marker pole 47. By continuously observing the position information of the marker pole 47, the elevation changes occurring at the upper elevation point and the lower elevation point can be observed.
[0004] In the height transmitter observation, the length reference line 6 is the reference for height transmission, and theoretically, its length is required to be unaffected by environmental changes. In practical applications, although the specially customized length reference contains Nb super-invar wire with a very small temperature coefficient, it will also be affected by temperature changes and produce temperature deformation, especially when the height transmission distance is long, the deformation caused by the change in ambient temperature will directly affect the measured value of the height transmitter. In order to reduce the error caused by temperature changes in height transmission, the conventional solution is to arrange temperature sensors in the observation corridor, synchronously observe the temperature changes in the corridor, and then calculate the deformation of the length reference line caused by the ambient temperature change based on the temperature change in the corridor and the thermal expansion coefficient of the length reference line, and directly deduct this part of the deformation from the measured value of the height transmitter, thereby reducing the influence of the deformation of the length reference line caused by the change in ambient temperature on the measured value of the height transmitter. However, due to the increase in the observation of the temperature in the corridor, the observation system is complicated. At the same time, due to the thermal conduction effect of the temperature, the temperature change in the corridor cannot accurately reflect the temperature change of the length reference line. Utility Model Content
[0005] In order to solve the defects in the prior art, the utility model proposes a composite length reference line for a height transmitter.
[0006] The utility model discloses a composite length reference line for a height transmitter, comprising a super-Invar alloy wire and a metal wire with a positive temperature coefficient, wherein an outer connecting tube is arranged at a connection between the super-Invar alloy wire and the metal wire with a positive temperature coefficient, wherein the outer connecting tube has a welding seam in its axial direction, wherein the outer connecting tube is fixedly connected to the super-Invar alloy wire and the metal wire with a positive temperature coefficient respectively through a welding body at the welding seam, wherein an end face of one side of the outer connecting tube is fixedly connected to a surface of the super-Invar alloy wire through welding, and an end face of the other side of the outer connecting tube is fixedly connected to a surface of the metal wire with a positive temperature coefficient through welding.
[0007] Preferably, the metal wire with a positive temperature coefficient is 316 stainless steel wire.
[0008] Preferably, the diameter of the positive temperature coefficient metal wire is 0.8 mm to 1.2 mm.
[0009] Preferably, the outer connecting tube is a 316 stainless steel connecting tube.
[0010] Preferably, the thermal expansion coefficient of the super-Invar alloy wire is not greater than -3×10 -7 / ℃ Nb-containing super-Invar alloy wire.
[0011] The utility model has the following beneficial effects:
[0012] The composite length reference line for the height transmitter of the utility model solves the deformation of the length reference line caused by the change of ambient temperature from the perspective of the reference line structure, thereby significantly reducing the error of the height transmitter caused by the temperature change and improving the measurement accuracy of the height transmitter. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:
[0014] Figure 1 The utility model is a schematic diagram of the axial section structure of a composite length reference line used for a height transmitter according to an embodiment of the utility model.
[0015] Figure 2 It is a cross-sectional schematic diagram of an external connecting tube according to an embodiment of the utility model.
[0016] Figure 3 It is a cross-sectional schematic diagram of the outer connecting tube after welding according to an embodiment of the utility model.
[0017] Figure 4 It is a structural schematic diagram of an existing height transmitter. DETAILED DESCRIPTION
[0018] The following will illustrate the implementation methods of the utility model in conjunction with the drawings in the specification. It should be noted that the implementation methods involved in this specification are not exhaustive and do not represent the only implementation methods of the utility model. The following corresponding embodiments are only for the purpose of clearly illustrating the utility model content of the utility model patent, and are not intended to limit its implementation methods. For ordinary technicians in this field, different forms of changes and modifications can be made on the basis of the description of these embodiments. All obvious changes or modifications that belong to the technical concept and utility model content of the utility model are also within the scope of protection of the utility model.
[0019] like Figures 1 to 3As shown, according to a preferred embodiment of the utility model, a composite length reference line 1 for a height transmitter comprises a super-Invar alloy wire 2 and a metal wire 3 with a positive temperature coefficient, and an external connection tube 4 is provided at the connection between the super-Invar alloy wire 2 and the metal wire 3 with a positive temperature coefficient, and the external connection tube 4 has a welding seam 6 in its axial direction, and the external connection tube 4 is fixedly connected to the super-Invar alloy wire 2 and the metal wire 3 with a positive temperature coefficient through a first welding body 7 at the welding seam 6. In addition, one side end face of the external connection tube 4 is fixedly connected to the surface of the super-Invar alloy wire 2 by welding, and the other side end face of the external connection tube 4 is fixedly connected to the surface of the metal wire 3 with a positive temperature coefficient by welding. That is to say, the two side ends of the external connection tube 4 are fixedly connected to the surface of the super-Invar alloy wire 2 and the surface of the metal wire 3 by a second welding body 5, respectively. Preferably, the first welding body 7 and the second welding body 5 can be welding bodies of the same material. Preferably, stainless steel is used.
[0020] In each preferred embodiment, the outer connecting tube 4 is a 316 stainless steel connecting tube. Preferably, the welding seam 6 of the outer connecting tube 4 is through in the axial direction, so that the first welding body 7 in the welding seam 6 can be fixedly connected with the second welding body 7 at the end of the outer connecting tube 4, thereby further increasing the firmness of the fixed connection between the Super Invar alloy wire 2 and the metal wire 3. Preferably, the radial width of the welding seam 6 of the outer connecting tube 4 is about 1 mm.
[0021] Generally, the humidity of the observation corridor on site is very high, so the metal wire 3 with positive temperature coefficient is preferably a metal wire with anti-corrosion performance. In a preferred embodiment, the metal wire 3 with positive temperature coefficient is 316 stainless steel wire, so that the composite length reference line 1 has excellent anti-corrosion performance. The thermal expansion coefficient of 316 stainless steel wire is 1.7×10 -5 / ℃.
[0022] In each preferred embodiment, the diameter of the metal wire with a positive temperature coefficient is 0.8 mm to 1.2 mm. More preferably, the diameter of the metal wire with a positive temperature coefficient is about 1 mm.
[0023] In each preferred embodiment, the super-Invar alloy wire has a thermal expansion coefficient not greater than -3×10 -7 / °C Nb-containing super-Invar alloy wire. Preferably, the diameter of the Nb-containing super-Invar alloy wire 2 is about 1 mm.
[0024] As mentioned above, the diameters of the Nb-containing super-invar alloy wire 2 and the 316 stainless steel wire 3 are very small, generally about 1 mm. To ensure that welding does not affect the tensile strength of the Nb-containing super-invar alloy wire 2 and the 316 stainless steel wire 3, welding is very difficult. Therefore, the utility model adopts a special process and structure. The specific cross-sectional structure of the composite length reference line 1 is as follows: Figure 1 shown.
[0025] The Nb-containing super-invar alloy wire 2 and the 316 stainless steel wire 3 are firstly connected by welding through a stainless steel outer connecting tube 4, and the cross-sectional shape of the outer connecting tube 4 is as follows: Figure 2 As shown, the outer connecting tube 4 is provided with a welding seam 6 in the axial direction. By effectively welding the Nb-containing super-invar alloy wire 2, the 316 stainless steel wire 3 and the outer connecting tube 4 in the welding seam 6, the cross-sectional view after welding is as shown in FIG. Figure 3 After the welding inside the welding seam 6 is completed, the two ends of the outer connecting tube 4 are respectively welded to the Nb-containing super-Invar alloy wire 2 and the 316 stainless steel wire 3, so that the Nb-containing super-Invar alloy wire 2 and the 316 stainless steel wire 3 are firmly connected together, and this connection method can effectively ensure the connection tensile strength of the Nb-containing super-Invar alloy wire 2 and the 316 stainless steel wire 3.
[0026] The composite length reference line for the height transmitter of the utility model solves the deformation of the length reference line caused by the change of ambient temperature from the perspective of the reference line structure. Specifically, a metal wire with a positive temperature coefficient is welded to a super-invar wire with a negative temperature coefficient to form a composite length reference line for temperature self-compensation, so that the length changes caused by the temperature offset each other. After compensation, the temperature coefficient of the entire composite length reference line approaches zero, thereby significantly reducing the error caused by the temperature change on the height transmitter and improving the measurement accuracy of the height transmitter.
[0027] Obviously, those skilled in the art should realize that the above embodiments are only used to illustrate the present invention, and are not used to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.
Claims
1. A composite length reference line for a height transmitter, characterized in that: It comprises a Super Invar alloy wire and a metal wire with a positive temperature coefficient. An external connection tube is provided at the connection between the Super Invar alloy wire and the metal wire with a positive temperature coefficient. The external connection tube has a welding seam in its axial direction. The external connection tube is fixedly connected to the Super Invar alloy wire and the metal wire with a positive temperature coefficient respectively through a welding body at the welding seam. One side end face of the external connection tube is fixedly connected to the surface of the Super Invar alloy wire by welding, and the other side end face of the external connection tube is fixedly connected to the surface of the metal wire with a positive temperature coefficient by welding.
2. The composite length reference line for a height transmitter according to claim 1, characterized in that: The metal wire with positive temperature coefficient is 316 stainless steel wire.
3. The composite length reference line for a height transmitter according to claim 2, characterized in that: The diameter of the positive temperature coefficient metal wire is 0.8 mm to 1.2 mm.
4. The composite length reference line for a height transmitter according to claim 1, characterized in that: The external connecting tube is a 316 stainless steel connecting tube.
5. The composite length reference line for a height transmitter according to claim 1, characterized in that: The thermal expansion coefficient of the super-Invar alloy wire is not greater than -3×10 -7 / ℃ Nb-containing super-Invar alloy wire.