Determination method, system, reflector, standing tank external measurement type liquid level gauge and installation method thereof

Abstract

The present invention discloses a determination method, a system, a reflector, a standing tank external measurement type liquid level gauge and its installation method, and the standing tank external measurement type liquid level gauge, during operation, its ultrasonic emission probe is installed on the outer wall of the standing tank to be measured, the ultrasonic wave emitted from the ultrasonic emission probe penetrates the side wall of the standing tank and generates an ultrasonic emission source on the inner wall of the standing tank to be measured, the position point of the ultrasonic emission source is the focus of the reflector at the same time, the sound wave signal emitted by the ultrasonic emission source is emitted to the reflector, and after being reflected by the reflector, it is emitted parallel to the preset direction, and after being reflected by the liquid level of the standing tank to be measured, it can return to the ultrasonic emission source position according to the original road, and then penetrate the side wall of the standing tank and be received by the measuring head of the external measurement type liquid level gauge installed outside the side wall of the standing tank, and the external measurement type liquid level gauge determines the liquid level position of the standing tank to be measured according to the emitted ultrasonic signal and the received ultrasonic signal. Obviously, this application achieves the purpose of reducing the amount of calculation work and improving the work efficiency.

Description

[Technical field]

[0001] The present invention relates to the technical field of liquid level measurement, and in particular to a reflector determination method, a determination system, a reflector, a standing tank external measurement type liquid level gauge and an installation method thereof. [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims priority to a Chinese patent application filed with the China Patent Office on April 14, 2022, with application number 202210413543.0 and titled "Determination method, system, reflector, standing tank external measurement type liquid level gauge and installation method thereof," the entire contents of which are incorporated herein by reference. [Background technology]

[0002] The design process of the reflecting surface in the existing external measurement type liquid level gauge is to use the calculation method of the geometric diagram to design every level of the N-level reflecting surface, then calculate the boundary point position of each level reflecting surface step by step, and then design the reflecting surface according to the boundary point position of the N-level reflecting surface. The reflecting surface can reflect the light beam emitted by the ultrasonic measuring head in any direction to any specified direction, and has a wide range of applications. However, during the design process, the reflecting surface does not have a specific calculation formula, which makes the work complicated and the amount of work very large. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Patent Application Publication No. 109883514 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a determination method, a system, a reflector, a standing tank external measurement type liquid level gauge and its installation method, so as to achieve the purpose of designing a reflector, reducing the amount of calculation work, and improving work efficiency without the need to calculate the boundary point positions of each level reflecting surface step by step. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention provides the following solutions: In a first aspect, the present invention provides a method for determining a reflector, the reflector being used to reflect an ultrasonic signal emitted by an ultrasonic emission source, the method comprising the steps of: determining a reference line segment, one end point of the reference line segment being a position point T, the length of the reference line segment being equal to a focal length P of the reflector, the position point T being the position of the ultrasonic emission source; Based on the focal length P and the position point T, a first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and a second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P and constructing a third right-handed three-dimensional Cartesian coordinate system OXYZ, where the position point T is at a positive value of the O1X1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, a length of a line segment O1T is equal to half the focal length P, and the position point T is at a positive value of the O1X1Y1 coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P is the coordinate origin of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system TX P Y P Z P TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P TX p obtained after translating the length of a line segment TO along the positive value direction of a coordinate axis, said position point T being at the negative value of the OX axis of said third right-handed three-dimensional Cartesian coordinate system OXYZ; determining a base cross section of a reflector in an O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 based on the position point T and the focal length P, where the base cross section is a base parabola, a focal length of the base parabola is a focal length P, a focus of the base parabola is the position point T, and the base parabola forms a paraboloid after rotating about the O1Y1 coordinate axis; The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Y p determining a first cross section of the reflector in a coordinate plane, where the first cross section is a first parabola, a focal length of the first parabola is a focal length P, and a focus of the first parabola is the location point T; The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Z p determining a second cross section of the reflector in a coordinate plane, said second cross section being a circular arc, a radius of said arc being the focal length P, and a center of said arc being said location point T; determining a third cross section of a reflector in an OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on a form of an equation of the parabola in the third right-handed three-dimensional Cartesian coordinate system OXYZ, where the third cross section is a second parabola, a focal length of the second parabola is a focal length P, and a focus of the second parabola is the location point T; determining a parabolic reflector based on the base cross section, the first cross section, the second cross section and the third cross section, where a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P.

[0006] In a second aspect, the present invention provides a determination system for determining a reflector, the reflector being used to reflect an ultrasonic signal emitted by an ultrasonic emission source, the determination system comprising: a reference line segment determination module for determining a reference line segment, one end point of the reference line segment being a position point T, the length of the reference line segment being equal to a focal length P of the reflector, and the position point T being the position of the ultrasonic emission source; Based on the focal length P and the position point T, a first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and a second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P and a coordinate system construction module for constructing a third right-handed three-dimensional Cartesian coordinate system OXYZ, where the position point T is at a positive value of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, a length of a line segment O1T is equal to half the focal length P, and the position point T is at a positive value of the O1Y1 coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P is the coordinate origin of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system TX P Y P Z P TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX.P Y P Z P TX p obtained after translating the length of a line segment TO along the positive value direction of a coordinate axis, said position point T being at the negative value of the OX axis of said third right-handed three-dimensional Cartesian coordinate system OXYZ; a base cross section determination module for determining a base cross section of a reflector in an O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 based on the position point T and the focal length P, where the base cross section is a base parabola, a focal length of the base parabola is a focal length P, a focus of the base parabola is the position point T, and the base parabola forms a paraboloid after rotating about the O1Y1 coordinate axis as a rotation axis; The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Y p a first cross section determination module for determining a first cross section of the reflector in a coordinate plane, where the first cross section is a first parabola, a focal length of the first parabola is a focal length P, and a focus of the first parabola is the location point T; The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Z p a second cross section determination module for determining a second cross section of the reflector in a coordinate plane, the second cross section being a circular arc, the radius of the circular arc being the focal length P, and the center of the circular arc being the location point T; a third cross section determination module for determining a third cross section of a reflector in an OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on a form of an equation of the parabola in the third right-handed three-dimensional Cartesian coordinate system OXYZ, where the third cross section is a second parabola, a focal length of the second parabola is a focal length P, and a focus of the second parabola is the location point T; and a reflector determination module for determining a parabolic reflector based on the base cross section, the first cross section, the second cross section and the third cross section, where a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P.

[0007] In a third aspect, the present invention provides a reflector determined by the method for determining a reflector according to the first aspect, the reflector being used to reflect an ultrasonic signal emitted by an ultrasonic emission source, The reflector is a parabolic reflector, a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P; The coordinates of the center point of the reflector in the third right-handed rectangular coordinate system OXYZ are the coordinate origin O(0,0,0), and the coordinates of the center point of the reflector in the second right-handed rectangular coordinate system TX p Y p Z p the coordinates of the center point of the reflector in the first right-handed rectangular coordinate system O1X1Y1Z1 are (P,P / 2,0); Here, the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p and the equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ is used to form a data table (x,y,z) of the paraboloid, and to manufacture a paraboloid-type reflector based on the data table (x,y,z) of the paraboloid.

[0008] In a fourth aspect, the present invention provides a standing tank external measurement liquid level gauge, comprising a liquid level determination module, an ultrasonic signal source positioner, and a reflector according to the third aspect, The ultrasonic signal source positioner includes an ultrasonic emitting probe, an ultrasonic emitting circuit connected to the ultrasonic emitting probe, an ultrasonic receiving probe, an ultrasonic receiving circuit connected to the ultrasonic receiving probe, and an ultrasonic intensity indicator, wherein the ultrasonic emitting probe emits ultrasonic waves from the outside of the standing tank wall to the tank wall, and the ultrasonic receiving probe receives ultrasonic signals from the inside of the standing tank side wall, and uses the intensity indication displayed by the ultrasonic intensity indicator to find the strongest position of the received ultrasonic signal, and determine the position point T of the ultrasonic emitting source formed on the inside of the standing tank wall after the ultrasonic waves emitted from the outside of the standing tank wall of the ultrasonic emitting probe penetrate the tank wall; The liquid level determination module comprises an external measurement type liquid level gauge, which is used to measure the liquid level in the standing tank from outside the tank.

[0009] In a fifth aspect, the present invention provides a method for installing an external standing tank level gauge according to the fourth aspect, comprising the steps of: determining a selected area, wherein the standing tank to be measured has no ultrasonic signal propagation blocking structure between directly above the selected area and the liquid surface of the standing tank to be measured; determining a position of an ultrasonic source on the inner wall of the standing tank to be measured within the selected area using an ultrasonic signal source positioner; Determining a location of a center point of a reflector according to the position of the ultrasonic emission source and the focal length P; Positioning the reflector according to the location point, such that a center point of the reflector overlaps with the location point, and a focal point of the reflector is a location point of the ultrasonic emission source. Effect of the Invention

[0010] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects. The present invention uses a parabolic function to design the reflector of the standing tank external measurement type liquid level gauge. When the standing tank external measurement type liquid level gauge is in operation, its ultrasonic emission probe is installed on the outer wall of the standing tank to be measured, the ultrasonic waves emitted from the ultrasonic emission probe penetrate the side wall of the standing tank and generate an ultrasonic emission source on the inner wall of the standing tank to be measured, and the position point of the ultrasonic emission source is simultaneously the focus of the reflector, the sound wave signal emitted by the ultrasonic emission source is emitted to the reflector and reflected by the reflector, and after being reflected by the liquid level of the standing tank to be measured, it can return to the ultrasonic emission source position according to the original road, and then penetrate the side wall of the standing tank and be received by the measuring head of the external measurement type liquid level gauge installed outside the side wall of the standing tank, and the external measurement type liquid level gauge determines the liquid level position of the standing tank to be measured according to the emitted ultrasonic signal and the received ultrasonic signal. Apparently, the reflector provided by the present application does not need to calculate the positions of boundary points of each level reflecting surface step by step, and can satisfy that the rays emitted from the focus in any direction forward are all emitted parallel to the preset direction after being reflected by the reflector, that is, the purpose of reducing the amount of calculation work and improving the work efficiency is achieved. [Brief description of the drawings]

[0011] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without creative efforts.

[0012] [Figure 1] FIG. 2 is a structural schematic diagram of a reflector according to the present invention. [Diagram 2] FIG. 2 is an actual diagram of a standing tank external measurement type liquid level gauge according to the present invention. [Diagram 3] 3A is a schematic structural diagram of the reflector according to the present invention when it is installed on a workbench, FIG 3(a) is a schematic overall structural diagram, FIG 3(b) is a front view, and FIG 3(c) is a plan view. [Figure 4] FIG. 2 is a structural schematic diagram of a steering gear according to the present invention. [Diagram 5] FIG. 2 is a schematic diagram of the actual installation of the steering gear according to the present invention; [Figure 6] 4 is a flowchart of a method for installing an external measurement type liquid level gauge according to the present invention. [Figure 7] 4 is a flow chart of a method for determining a reflector according to the present invention. [Figure 8(a)] FIG. 1 is a first cross-sectional schematic diagram according to the present invention. [Figure 8(b)] FIG. 2 is a second cross-sectional schematic view according to the present invention. [Figure 9] 1 is a cross-sectional view of a circular reflector according to the present invention. [Figure 10] FIG. 2 is a structural schematic diagram of a reflector determination system according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, obviously, the described embodiments are only some embodiments of the present invention, not all embodiments, based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts are all within the protection scope of the present invention.

[0014] The present invention aims to provide a determination method, a system, a reflector, a standing tank external measurement type liquid level gauge and its installation method, so as to achieve the purpose of designing a reflector, reducing the amount of calculation work, and improving work efficiency without the need to calculate the boundary point positions of each level reflecting surface step by step.

[0015] In order to make the above objects, features and advantages of the present invention more apparent and comprehensible, the present invention will be described in more detail below with reference to the drawings and the description of the preferred embodiments of the present invention.

[0016] In order to enable the standing tank external measurement type liquid level gauge to quickly and easily measure the liquid level of the standing tank from the outside of the side wall of the standing tank, the present invention provides a reflector as shown in Figure 1, so that the ultrasonic signals scattered in each direction emitted by the external measurement type liquid level gauge probe can be reflected by the reflector and then incident on the standing tank liquid level in a parallel and perpendicular manner.

[0017] [Example 1] As shown in FIG. 1, this embodiment provides a reflector for a standing tank external measurement type liquid level gauge designed using a parabolic function, that is, a parabolic reflector is provided.

[0018] The reflector is a parabolic reflector, the center point of the parabolic reflector is the coordinate origin O, the focus of the parabolic reflector is the position point T, and the focal length of the parabolic reflector is the focal length P.

[0019] The coordinates of the center point of the reflector in the third right-handed rectangular coordinate system OXYZ are the coordinate origin O(0,0,0), and the coordinates of the center point of the reflector in the second right-handed rectangular coordinate system TX p Y p Z p The coordinates of the center point of the reflector in the first right-handed rectangular coordinate system O1X1Y1Z1 are (P,P / 2,0).

[0020] 1st right-hand 3-dimensional rectangular coordinate system O1X1Y1Z1, 2nd right-hand 3-dimensional rectangular coordinate system TX p Y p Z p and the equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ is used to form a data table (x,y,z) of the paraboloid, and to manufacture a paraboloid-type reflector based on the data table (x,y,z) of the paraboloid.

[0021] Here, the position point T is at a positive value of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, the length of the line segment O1T is equal to half the focal length P, and the position point T is at a positive value of the O1Y1 coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P is the coordinate origin of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system TX P Y P Z P TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P TX p The position point T is obtained after translating the length of a line segment TO along the positive value direction of a coordinate axis, and is at the negative value of the OX axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ.

[0022] Based on the position point T and the focal length P, determine a base cross section of the reflector on an O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, where the base cross section is a base parabola, a focal length of the base parabola is focal length P, a focus of the base parabola is the position point T, and the base parabola forms a paraboloid after rotating about the O1Y1 coordinate axis as a rotation axis.

[0023] The equation of the base parabola in the O1X1Y1 coordinate plane of the first right-handed three-dimensional rectangular coordinate system O1X1Y1Z1 is x1 2 =2Py1, where x1 is the X1 coordinate in the O1X1Y1 coordinate plane, and y1 is the y1 coordinate in the O1X1Y1 coordinate plane.

[0024] The equation of the paraboloid in the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 is 2 +z1 2 =2Py1, where X1 is the coordinate on the O1X1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, y1 is the coordinate on the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and z1 is the coordinate on the O1Z1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1.

[0025] The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p The equation of the paraboloid at x is of the form p 2 +z p 2 =2P(y p +P / 2), where x p is the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p is the coordinate on the coordinate axis, y p is the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TY p is the coordinate on the z axis. p is the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TZ p are the coordinates on the coordinate axes,

[0026] The equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ has the form (x+P) 2 +z 2 =2Py+P 2 where x is the coordinate on the OX coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ, y is the coordinate on the OY coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ, and z is the coordinate on the OZ coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ.

[0027] The equation of the first parabola is x p 2 =2Py p +P 2 In the first cross section, the ultrasonic emission source is located in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Y p From the coordinate origin T of the coordinate plane, any point (x p ,y p ) is the pitch angle θ=art(y p / x p ), where x p is the projection point (x p ,y p )'s TX p is the coordinate value, y p is the projection point (x p ,y p )'s TY p The pitch angle range is a coordinate value of the ultrasonic signal emitted by the ultrasonic emission source. p Y p The range of radiation angles on the coordinate plane.

[0028] The equation of the arc is x p 2 +z p 2 =P2, and the ultrasonic emission source is located in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p From the coordinate origin T of the reflecting surface of the parabolic reflector, an arbitrary point (x p ,z p ) is incident on the horizontal angle θ=art(z p / x p ), where x p is an ultrasonic signal emitted from a position point T. p Z p Projection point (x p ,z p ) is the TXp coordinate value incident on z pis an ultrasonic signal emitted from a position point T. p Z p Projection point (x p ,z p ) into the TZ p The horizontal angle range is a coordinate value, and the ultrasonic signal emitted by the ultrasonic emission source is p Z p is the range of radiation angles in the coordinate plane, and the equation of the second parabola is z 2 =2Py, and said second parabola lies in the OYZ coordinate plane of said third right-handed three-dimensional Cartesian coordinate system OXYZ.

[0029] The reflector is made of steel, brass, or other material whose acoustic impedance is significantly larger than that of the measured liquid, for example, the acoustic impedance of the liquid is 1, the acoustic impedance of steel is 45, and the sound reflection rate in the liquid is 1-1 / 45=97.8%. To prevent interference caused by the reflected waves at the front and back of the reflector, the reflector is made of a thin plate with a thickness of 0.5∽1 mm, or a non-plate-shaped member whose back and front are not parallel. For convenience of subsequent installation, a positioning hole O, i.e., a center hole, with a diameter of Φ0.3∽Φ0.5 is drilled at the center point of the reflector, and a semicircular groove N with a diameter of Φ0.5∽Φ2 is drilled at the highest point of the reflector, i.e., the highest point (XN,YN,0) of the cross section of the XOY coordinate plane of the third right-handed three-dimensional rectangular coordinate system OXYZ.

[0030] The third right-handed three-dimensional Cartesian coordinate system OXYZ is constructed based on the focal length P and the center point of the reflector, where the focal point is at the negative value of the OX axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ.

[0031] In this embodiment, a reflector is designed using a parabolic function, and there is no need to calculate the positions of the boundary points of each level reflecting surface step by step, thereby reducing the amount of calculation work and improving the work efficiency, and making it easier for the parabolic reflector to be widely used.

[0032] [Example 2] Referring to FIG. 2, this embodiment provides a new standing tank external measurement type liquid level gauge, which includes a liquid level determination module, an ultrasonic signal source positioner, and a reflector as described in the first embodiment.

[0033] The ultrasonic signal source positioner includes an ultrasonic emitting probe, an ultrasonic emitting circuit connected to the ultrasonic emitting probe, an ultrasonic receiving probe, an ultrasonic receiving circuit connected to the ultrasonic receiving probe, and an ultrasonic intensity indicator, wherein the ultrasonic emitting probe emits ultrasonic waves from the outside of the standing tank wall to the tank wall, the ultrasonic receiving probe receives ultrasonic signals from the inside of the standing tank side wall, and uses the intensity indication displayed by the ultrasonic intensity indicator to find the strongest position of the received ultrasonic signal, and determines the position point T of the ultrasonic emitting source formed on the inside of the standing tank wall after the ultrasonic waves emitted from the outside of the standing tank wall of the ultrasonic emitting probe penetrate the tank wall, and the liquid level determination module is composed of an external measurement type liquid level gauge, and the external measurement type liquid level gauge is used to measure the liquid level in the tank from outside the tank.

[0034] [Example 3] Based on the second embodiment, the external measurement type liquid level gauge also includes a support, which is used to install the reflector in the standing tank to be measured.

[0035] The support part described in this embodiment may be of any type as long as it can fix the reflector, and there are many types, such as one that uses four supports or one that is fixed to the side wall of the standing tank.

[0036] In one example: as shown in FIG. 3 , the support includes a worktable 2, the center line of symmetry of the worktable 2 lies in the OXY coordinate plane in the third right-handed three-dimensional Cartesian coordinate system OXYZ, where the third right-handed three-dimensional Cartesian coordinate system OXYZ is constructed based on the focal length P and the center point of the reflector, and the center point of the reflector lies at the coordinate origin O(0,0,0) of the third coordinate system OXYZ.

[0037] Here, the focus is at the negative value of the OX axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ, which further includes an OY axis and an OZ axis.

[0038] The workbench 2 is a workbench made of sheet metal, and the reflector 1 is fixed to the workbench.

[0039] The bc arc side of the work platform 2, which is close to one end of the side wall of the standing tank, overlaps with the lower end of the reflector 1, where A(X A ,Y A The point M(X,0) is the lower end point of the parabola of the cross section of the reflector and the OXY coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ. One end of the work platform 2 far from the side wall of the standing tank is located at M(X,0) on the third right-handed Cartesian coordinate system OXYZ. M ,0,0) point on the worktable. M A semicircular groove M with a diameter of Φ0.5∽Φ1 is opened at the point (0,0,0). A level gauge aligned along the OX coordinate axis direction and a level gauge aligned along the OZ coordinate axis direction are installed on the workbench 2. The purpose of installing these two level gauges is to install the workbench 2 parallel to the OXZ coordinate plane.

[0040] Furthermore, the support includes at least three pipe-shaped pillars 3, the length of which is adjustable and which are fastened by screws, namely a first pillar a, a second pillar b and a third pillar c, which are connected and fixed to each other via lateral connecting rods between the first pillar a, the second pillar b and the third pillar c.

[0041] The upper end of the first support passes successively from near the semicircular groove M of the support and near the semicircular groove N of the reflector, the second support and the third support are respectively located on both sides of the first support, and the upper ends of the second support and the third support are all fixed to the support (or points b and c of the workbench 2 shown in Figure 3).

[0042] The highest point N(X(X N ,YN , 0) is the semicircular groove N, and the semicircular groove M is on the symmetric center line of the worktable. The coordinates of the semicircular groove M in the third right-handed three-dimensional Cartesian coordinate system OXYZ are (X M ,0,0).

[0043] During operation, the lower end of the first support a, the lower end of the second support b, and the lower end of the third support c are all fixed to the bottom of the standing tank to be measured.

[0044] Another example: In the case of operating conditions where a reflector cannot be installed at the bottom of the tank, for example, 1. when a reflector cannot be installed at the bottom of the standing tank to be measured, 2. when using a standing tank external measurement type liquid level gauge in a sausage-shaped tank, when other equipment is blocked in the tank or the curvature of the elliptical tank bottom is large, i.e. when a reflector cannot be installed at the bottom of the standing tank, the steering gear support must be fixed to the side wall of the standing tank.

[0045] As shown in Figure 4, the steering gear in the external measurement type liquid level gauge is the entire combination of a reflector and a support, that is, the reflector is fixed to the support to form the steering gear, and the steering gear is installed on the inner wall of the standing tank to be measured via a support.

[0046] The steering gear needs to be installed on the inner wall of the standing tank to be measured by welding, so the necessary condition for installing the steering gear is that people can enter the tank and use fire.

[0047] Selection of steering gear installation position: Select a low position in the tank for ease of operation, but not in the liquid residue sediment layer accumulated at the bottom of the tank, to avoid the sediment obstructing the propagation of sound waves. The upper structure parts should also be avoided, to avoid the transmission of sound waves between the steering gear and the liquid surface.

[0048] In addition, the steering gear can be installed horizontally on the inner wall of the standing tank to be measured, and the actual diagram is shown in Figure 2.

[0049] [Example 4] Based on the third embodiment, this embodiment provides an installation method.

[0050] As shown in FIG. 6, the installation method provided by this embodiment is used to install an external measurement type liquid level gauge, and the method includes: Step 601: determining a selected area, the selected area including a spatial area between an ultrasonic signal source and a reflector and a spatial area between the reflector and a liquid surface directly above the reflector, where the standing tank to be measured has no structure within the selected area that blocks ultrasonic signal propagation. Step 602: determining a position of an ultrasonic source on the inner wall of the standing tank to be measured using an ultrasonic signal source positioner within the selected area; Step 603: determining a location point of a center point of a reflector according to the position point of the ultrasonic emission source and the focal length P; Step 604: positioning the reflector according to the arrangement point, so that the center point of the reflector overlaps with the arrangement point, and the focal point of the reflector is the location point of the ultrasonic emission source; In step 602, the ultrasonic signal source positioner includes an ultrasonic emitting circuit, an ultrasonic emitting probe, an ultrasonic receiving circuit, an ultrasonic receiving probe, and an ultrasonic intensity indicator connected to the ultrasonic receiving probe.

[0051] Specifically, step 602 includes the following steps: Step A: placing the sonic wave emitting probe on a target area of ​​the outer wall of the standing tank to be measured, the target area facing the selected area; Step B: installing the ultrasonic receiving probe on an inner wall corresponding to the ultrasonic transmitting probe; Step C: adjusting the position of the ultrasonic emitting probe and the ultrasonic receiving probe according to the ultrasonic intensity indicator, until determining the position where the signal is strongest, the position where the signal is strongest is located in the target area, and the position where the signal is strongest is the position point of the ultrasonic emitting source; Step D: Marking the selected ultrasonic emitting probe position on the outside of the standing tank sidewall and the position point on the inside of the standing tank sidewall respectively, and then removing the ultrasonic signal source positioner.

[0052] Referring to FIG. 3, step 603 specifically includes: fixing the magnetic adsorption end of the focal length scale to the position point of the ultrasonic emission source by magnetic force; the focal length scale is a straight rod with a length equal to the focal length P, one end of the focal length scale is in the shape of a sharp tip, and the other end has a magnetic base, the end face of the magnetic base is perpendicular to the axial direction of the focal length scale; when in use, the magnetic base end of the focal length scale is adsorbed to the ultrasonic emission source position marked on the inner wall of the standing tank, and the position of the reflector is set and adjusted, and the sharp tip of the focal length scale is inserted into the small hole of the reflector center point O, and the center point of the reflector is positioned at the placement point. Furthermore, Step a: fixing an adsorption end of a focal length scale 4 to a position point of the ultrasonic emission source, the focal length scale 4 including a magnetic base, an adsorption end, a sharp tip and a scale pole connecting the adsorption end and the sharp tip.

[0053] During the execution of step a, the suction end is fixed to a magnetic base perpendicular to the inner wall of the standing tank, and the position to which the magnetic base belongs is the position point of the ultrasonic emission source.

[0054] Step b: Using the length of the focal length scale 4 as a focal length P, determine that the position to which the sharp tip of the focal length scale 4 belongs is the location point of the center point of the reflector.

[0055] In step 604, according to the placement of the center point of the reflector 1, the reflector is placed, and the reflector is moved so that the sharp tip of the focal length scale is aligned and enters the center point of the reflector. Taking advantage of the characteristic that the length of the focal length scale is a fixed focal length P, the sharp tip of the focal length scale is aligned and enters the center point (i.e., the central hole O) of the reflector, so that the center point O of the reflector is aligned with the coordinate axis TX P This allows accurate positioning in the field.

[0056] Therefore, in step 604, placing the reflector 1 according to the arrangement point specifically includes: Step 1: Installing the reflector 1 on a support in accordance with the placement point; Step 2: Adjusting the pitch angle and horizontal angle of the reflector, making the pitch angle θ of the reflector 0 degrees and the horizontal angle φ of the reflector 0 degrees, and further making the two mutually perpendicular level gauges at the support part horizontal.

[0057] In the case of a standing tank with a diameter of more than 4 meters, for example 15 meters, in order to prevent the support structure supporting the floating tank top from interfering with ultrasonic propagation between the reflector and the liquid floating tank top, the distance between the reflector and the side wall of the standing tank needs to be large, for example 1000 mm or more, in this case, the focal length P needs to be relatively large, for example 1000 mm or more, in this case, a focal length scale of 1000 mm or more needs to be used, which is difficult to operate to keep it in a horizontal straight line. In this case, a laser distance measuring calibrator can be used. The magnetic base of the laser distance measuring calibrator is adsorbed and fixed to the position point of the ultrasonic emission source, the position of the reflector and the work table are adjusted, the laser emitted from the laser distance measuring calibrator is made incident on the O point of the reflector, and the display distance is equal to the focal length P. Then, the pitch angle and horizontal angle of the reflector and the work table are adjusted, the pitch angle θ of the reflector is set to 0 degrees, the horizontal angle φ is set to 0 degrees, and the two mutually perpendicular level gauges at the support part are leveled.

[0058] Step 2 further includes: Step 21: Install the flat reflector 6 horizontally directly above the reflector 1, and install one level gauge on each of the two mutually perpendicular edges of the flat reflector 6, which is used to adjust the flat reflector 6 to make it level. In a floating roof tank, the flat reflector 6 can be fixedly installed on the floating roof directly above the reflector. In a tank without a floating roof, the flat reflector 6 is temporarily installed on a temporary bracket on the top of the reflector, and after the steering gear is calibrated with a laser distance scanner and the installation of the reflector is completed, the flat reflector 6 is removed. Step 22: adsorb and fix the magnetic base of the laser distance measuring calibrator to the position of the ultrasonic emission source, and use the scanning function of the laser distance measuring calibrator to adjust the position of the reflector 1 so that the laser emitted from the laser distance measuring calibrator is incident on the center point of the reflector, and the distance displayed by the laser distance measuring calibrator is equal to the focal length P, and further set the pitch angle θ of the reflector to 0 degrees and the horizontal angle φ to 0 degrees, thereby leveling the two mutually perpendicular level gauges on the support part.

[0059] The specific process of adjusting the reflector position using the scanning function of the laser distance calibrator is as follows: The scanning function of the laser distance measuring calibrator is used to scan the emitted laser like a crosshair or other graphic, and the laser is reflected by a flat reflector 6 installed above the worktable and adjusted horizontally. The reflected signal is focused on the ultrasonic emission source to form a small circular bright spot, and it is judged whether the shape and installation of the reflector are very accurate. Specifically, Control the graphic signal emitted by the laser distance measuring calibrator, the graphic signal is reflected by a flat reflector 6 installed above the reflector 1 and adjusted horizontally, and focused at a position close to the ultrasonic emission source to form a small circular bright spot, the graphic signal being a scanning crosshair or other graphic. The pitch angle, horizontal angle, shape and installation position of the reflector are adjusted according to the shape of the graphic signal focused on a position close to the ultrasonic emission source, so that the graphic signal close to the ultrasonic emission source becomes as small a circular graphic as possible.

[0060] In step 2, another kind of simple method for adjusting the installation angle of the steering gear to make the pitch angle and horizontal angle of the reflector all equal to 0 degrees is to hang the hook at one end of the weight wire 5 on the semicircular groove N at the highest part of the reflector, let the weight hang freely, adjust the pitch angle θ of the reflector in the TXY coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ and the horizontal angle φ in the TXZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ, make the weight wire 5 enter the semicircular groove M of the worktable, and the weight wire 5 does not contact the edge of the semicircular groove M, adjust the pitch angle and horizontal angle of the reflector, and make the two level gauges installed perpendicular to each other at the support level, thus completing the accurate angular positioning of the worktable of the reflective surface simply.

[0061] Here, the third right-handed three-dimensional Cartesian coordinate system OXYZ is constructed based on the focal length P and the center point of the reflector, and the highest point (X N ,Y N , 0) is the semicircular groove N, and the coordinates of the semicircular groove M in the third right-handed three-dimensional Cartesian coordinate system OXYZ are (X N ,0,0).

[0062] In this embodiment, it is further necessary to use the copper wire 5 and the auxiliary fixture to fine-tune the reflector installation position.

[0063] A hook is fixed to one end of the weight wire 5, and a weight is hoisted at the other end of the weight wire 5. The auxiliary fixture is configured by installing a neodymium iron boron magnet at each end and connecting the ends with a rubber band.

[0064] Specifically, when the hook is hung in the semicircular groove N of the reflector and the weight wire is freely suspended statically, the weight is embedded in the semicircular groove M of the workbench 2 and does not come into contact with the wall of the semicircular groove M, thereby quickly and accurately determining the exact angles in the three directions when the reflector is installed.

[0065] That is, after the reflector 1 is installed according to the arrangement point, The method includes: hanging a copper wire 5 in the semicircular groove N of the reflector, so that the copper on the copper wire 5 hangs freely; adjusting the pitch angle of the reflector 1 in the TXY coordinate plane of the first right-handed three-dimensional rectangular coordinate system OXYZ and the horizontal angle of the reflector 1 in the TXZ coordinate plane of the first right-handed three-dimensional rectangular coordinate system OXYZ, so that the copper wire 5 enters the semicircular groove M, and the copper wire 5 does not contact the edge of the semicircular groove M, completing the angular positioning of the reflector.

[0066] Here, the first right-handed three-dimensional Cartesian coordinate system OXYZ is constructed based on the focal length P and the center point of the reflector, and the highest point (X N ,Y N , 0) is the semicircular groove N, and the coordinates of the semicircular groove M in the first right-handed three-dimensional Cartesian coordinate system OXYZ are (X N ,0,0).

[0067] To facilitate installation and to allow the use of the auxiliary fixator, the auxiliary fixator is composed of two neodymium iron boron magnets and a rubber band connecting the two magnets. During installation, one neodymium iron boron magnet of the auxiliary fixator is attracted to point A of the worktable 2, and one neodymium iron boron magnet at the other end is attracted to the lower part of the focal point T inside the tank wall. The tension of the rubber band assists in pulling the steering gear to the tank wall and temporarily fixing it, making it easy to adjust the position and calibrate.

[0068] After the reflector is installed and calibrated, fix the reflector 1 at points a, b, c, and d to the tank wall by welding, adhesion, or magnetic attraction, and fix the first support a, the second support b, and the third support c. Remove the focal length scale 4, the weight wire 5, the auxiliary fixer, and the flat reflector 6. The flat reflector 6 installed on the floating roof in the floating roof tank is not removed after the steering gear reflector is installed.

[0069] Since the tank wall at the probe installation site does not guarantee to be exactly perpendicular to the horizontal plane, the focal length scale adsorbed vertically to the side wall does not guarantee to be exactly horizontal, nor does it guarantee to be exactly perpendicular to the side wall of the standing tank. However, the focal length scale 4 or the laser distance measuring scanner ensures that the distance from the reflector center point O to the ultrasonic emission source T on the inside wall of the standing tank is exactly equal to the focal length P, then the level gauges installed perpendicular to each other on the steering gear work table 2 are used to level, and then the angle of the reflector and the shape of the reflecting surface are fine-tuned by the laser distance measuring scanner so that the laser emitted from the laser distance measuring scanner is reflected upward through the reflector 1 to the horizontally installed flat reflector 6, and then the shape of the spot reflected through the reflector 1 and returning to the ultrasonic emission source T is a small circular point, and in this way, the pitch angle error and horizontal angle error of the focal length scale do not affect the reflector 1 to accurately reflect and focus the ultrasonic waves from each direction to return to the ultrasonic emission source.

[0070] When the external measuring level gauge is working, its ultrasonic probe is installed on the outer wall of the standing tank to be measured, and the ultrasonic probe forms an ultrasonic emission source on the inner wall of the standing tank to be measured, and the position point of the ultrasonic emission source is at the same time the focus of the reflector, and the sound signal emitted by the ultrasonic emission source is emitted to the reflector, and after being reflected by the reflector, it can be emitted parallel to the preset direction, and after being reflected by the liquid level of the standing tank to be measured, it can return along the original road, and then be received by the external measuring level gauge, and the external measuring level gauge determines the liquid level position of the standing tank to be measured according to the ultrasonic signal emitted by the ultrasonic probe and the sound signal received by the ultrasonic probe. Obviously, the reflector provided by this application does not need to calculate the position of the boundary point of each level reflection surface step by step, and can meet the requirement that the rays emitted from the focus in any direction forward are all emitted parallel to the preset direction after being reflected by the reflector, that is, the purpose of reducing the amount of calculation work and improving the work efficiency is achieved.

[0071] [Example 5] Referring to FIG. 7, the determination method provided by this embodiment is used to determine the reflector described in Example 1, and the reflector is used to reflect an acoustic signal emitted by an ultrasonic emission source, and the determination method includes:

[0072] Step 701: Determine a reference line segment, one end point of the reference line segment is a position point T, the length of the reference line segment is equal to the focal length P of the reflector, and the position point T is the position of the ultrasonic emission source. The focal length P is artificially selected according to the diameter D of the standing tank to be measured, and the selection principle is that the focal length P is less than or equal to D / 2. For example: the horizontal section within the standing tank where the reference line segment is located is a standard plane of the measured standing tank, and the focal length P is less than or equal to the radius of the standard plane. For example, if you want to measure the depth from the oil surface to the well head, D = 200 mm, the selected focal length P=D / 2=100 mm. For example, when measuring the depth from the water surface to the mouth of a deep well, if the diameter of the well is D=400 mm, the selected focal length P=D / 2=200 mm. In addition, when the diameter D of the standing tank to be measured is very large, for example, for a vertical storage tank, when the diameter D is between 500 mm and 50 meters, the principle for determining the focal length P is that there is no ultrasonic propagation obstruction structure such as a pipe, a cross beam, etc. between the upper part of the reflecting surface and the liquid surface or the floating roof floating on the liquid surface, and the ultrasonic wave is not radiated to the circular sealing hose of the floating roof disc edge, etc. For a standing tank with a large diameter, the structural members in the tank are all relatively large, and the reflecting surface needs to be farther away from the side wall, so the focal length P of the parabolic surface of the selected reflector needs to be larger, and for a standing tank with a diameter of 4 meters or more, the focal length P can be selected to be about 1000 mm. If the reflector is larger than the 600 mm diameter manhole of the standing tank, the reflector needs to be divided and processed into several parts, which are then sent through the manhole to the standing tank and then accurately assembled to become the reflector.

[0073] Step 702: Based on the focal length P and the position point T, a first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and a second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P and a third right-handed three-dimensional Cartesian coordinate system OXYZ is constructed, as shown in Figure 1. Here, the position point T is at a positive value of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, the length of a line segment O1T (one end point is the origin of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and the other end point is the position point T) is equal to half the focal length P, and the position point T is at a positive value of the O1Y1 coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P is the coordinate origin of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z Pis obtained after translating the length of the line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and P Y P Z P TY p The coordinate axis overlaps with the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P TX p The coordinate axis is parallel to the O1X1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and is parallel to the O1X1 coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P TZ p The coordinate axis overlaps with the O1Z1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1. The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the same as the coordinate origin O of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P TX p The position point T is obtained after translating the length of the line segment TO along the positive value direction of the coordinate axis, and the position point T is at the negative value of the OX axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ, and the OX coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ is at the negative value of the OX coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P TX p The OY coordinate axis of the third right-handed three-dimensional rectangular coordinate system OXYZ overlaps with the coordinate axis of the second right-handed three-dimensional rectangular coordinate system TX P Y P Z P TY pThe OZ coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ is parallel to the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P TZ p It is parallel to the coordinate axes.

[0074] Step 703: Based on the position point T and the focal length P, determine a base cross section of the reflector in the O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, where the base cross section is a base parabola, a focal length of the base parabola is focal length P, a focus of the base parabola is the position point T, and the base parabola forms a paraboloid after rotating around the coordinate axis O1Y1 as a rotation axis.

[0075] Step 704: The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Y p Determine a first cross section of the reflector in a coordinate plane, where, referring to FIG. 8(a), the first cross section is a first parabola, a focal length of the first parabola is focal length P, and a focus of the first parabola is the location point T.

[0076] Step 705: The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Z p Determine a second cross section of the reflector in the coordinate plane, where, referring to FIG. 8(b), the second cross section is a circular arc, the center of the arc is the location point T, and the radius of the arc is the focal length P.

[0077] Step 706: Based on the form of the equation of the parabola in the third right-handed three-dimensional Cartesian coordinate system OXYZ, determine a third cross section of the reflector in the OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ, where the third cross section is a second parabola. The edge shape of the reflector reflective surface can be arbitrarily selected according to the specific situation, and is not exclusive. For example, the reflector is inserted into the standing tank through a manhole (i.e., a circular hole with a sealing cover and a diameter of less than 600 mm that is left in advance on the side wall of the standing tank for the owner to enter the tank), The reflector must be shaped like a thin rectangular rod with a width of less than 600 mm. For example, in order to reduce the cost of the mold for processing the reflecting surface, the reflecting surface can be processed into an ellipse to reduce the area of ​​the mold. P The projection along the coordinate axis direction at point O, i.e., the left side view, is circular, and the top view downward from the OY coordinate axis is also circular.

[0078] Step 707: Determine a parabolic reflector based on the basic cross section, the first cross section, the second cross section and the third cross section, where a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P. Taking Fig. 8(b) as an example, TX P The projection along the axial direction is the top and bottom edges of the rectangular reflector TY PAll projections in the axial direction are circular arcs. Any ray TD emitted from focal point T with a departure angle θ>0 degrees, and ray DP after reflection by the reflector, enters vertically upward at point P on the horizontal liquid surface, any ray TO with a departure angle θ=0 degrees, and ray OP0 after reflection by the reflector enters vertically upward at point P0 on the horizontal liquid surface, and any ray TD1 with a departure angle θ<0 degrees, and ray D1P1 after reflection by the reflector enters vertically upward at point P1 on the horizontal liquid surface. Reflected rays PD, P0O, and P1D1 after reflection by the liquid surface all enter the reflector vertically downward, and rays DT, OT, and D1T after reflection by the reflector all enter focal point T. Therefore, the characteristics of the reflector are that all rays emitted from focal point T in any forward direction enter TY after reflection by the reflector. P The injection direction is parallel to the axis.

[0079] In this embodiment, the reflector designed using the parabolic function method can achieve the purpose of reflecting all rays emitted from the focal point in any direction forward in a parallel direction, which significantly reduces the amount of design calculation work and improves efficiency.

[0080] In one example: the equation of the parabola of the base section in the O1X1Y1 coordinate plane of the first coordinate system O1X1Y1Z1 is x1 2 = 2Py1, where x1 is the X1 coordinate of the coordinate plane O1X1Y1, and y1 is the Y1 coordinate of the coordinate plane O1X1Y1. The parabola of the base cross section rotates around the coordinate axis O1Y1 as the axis of rotation to form a paraboloid, and the angle range of the paraboloid rotating along the coordinate axis O1Y1 is the range of horizontal angles.

[0081] The equation of the paraboloid in the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 is x1 2 +z1 2=2Py1, where x1 is the coordinate on the O1X1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, y1 is the coordinate on the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and z1 is the coordinate on the O1Z1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and the paraboloid passes through the coordinate origin (0,0,0) of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1.

[0082] The first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p The relationship is x1=x p , y1=y p +P / 2, z1=z p and the paraboloid equation in the first right-handed three-dimensional Cartesian coordinate system is expressed as p Y p Z p The format is x p 2 +z p 2 =2P(y p +P / 2).

[0083] The paraboloid is expressed by the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P The reflector paraboloid passes through the (P,0,0), (-P,0,0), (0,-P / 2,0), (0,0,P), and (0,0,-P) points of the second right-handed rectangular coordinate system TX P Y P Z P TX P Y P The equation of a parabola at a cross section on the coordinate plane is x p 2 =2P(y p +P / 2).

[0084] The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p The relationship between the third right-handed three-dimensional rectangular coordinate system OXYZ and x p =x+P,yp =y,z p =z, and the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p The paraboloid equation in the third right-handed three-dimensional rectangular coordinate system OXYZ is (x+P) 2 +z 2 = 2P(y + P / 2). The paraboloid passes through the origin (0.0,0) of the third right-handed three-dimensional Cartesian coordinate system.

[0085] The equation of the parabola of the reflector paraboloid at the first cross section of the OXY coordinate plane of the third right-handed rectangular coordinate system OXYZ is (x+P) 2 =2P(y+P / 2), and the first parabolic function obtained is y=(x+P) 2 / (2P)-P / 2, so that the reflector can describe a first cross-sectional parabola on the coordinate plane OXY of the third right-handed rectangular coordinate system OXYZ, as shown in FIG. 8(a). From the first parabolic function, a data table of the first cross-sectional parabola can be calculated, as shown in Table 1.

[0086] From the equation of the paraboloid in the third right-handed rectangular coordinate system OXYZ, when y=0, the equation of the second cross section of the reflector in the coordinate plane OXZ is (x+P) 2 +z 2 =P 2 This is a circular arc with the signal emission source T as its center and P as its radius, and the upper and lower edges of the reflector are concentric circular arcs with T as their center.

[0087] From the paraboloid equation in the third right-handed rectangular coordinate system OXYZ, the paraboloid function in the third right-handed rectangular coordinate system is y=((x+P) 2 +z 2 ) / (2P)-P / 2.

[0088] The paraboloid passes through the origin (0,0,0) of the third right-handed triangular coordinate system, and according to a paraboloid function in the third right-handed triangular coordinate system, a y value corresponding to each pair of (x,z) values ​​is calculated, a data table of the paraboloid is listed, and according to the data table, a processing mold for the parabolic reflector is machined to manufacture the parabolic reflector.

[0089] The range of the pitch angle is set so that the ultrasonic emission source is located at a position T to p The TX of the ultrasonic signal emitted along the direction p Y p The range of the radiation angle θ on the coordinate plane, and the pitch angle θ = art(y p / x p ), as shown in FIG. 8(a) and Table 1. The horizontal angle range is the range from the ultrasonic wave emission source position point T to TX P The TX of the ultrasonic signal emitted along the coordinate direction P Z P The range of radiation angle φ on the coordinate plane is horizontal angle φ = art(z p / x p ), shown in Figure 8(b).

[0090] Therefore, taking the focal length P=150 mm as an example, the data table of the first parabola of the parabolic reflecting surface in Table 1 can be calculated, the unit being millimeters. x1 2 =2Py1; x P 2 =2P(y P +P / 2),x1=x P ,y1=y P +P / 2; (x+P) 2 =2P(y+P / 2),x P =x+P,y P =y;

[0091] [Table 1] [Table 2]

[0092] The pitch angle range and the horizontal angle range are all determined according to actual conditions and work needs, there is no ultrasonic signal propagation blocking structure between the parabolic reflector and the liquid surface of the measured standing tank, and the focal length P is less than or equal to the radius of the measured standing tank.

[0093] Preferably, the pitch angle range and the horizontal angle range are all determined according to actual conditions and work needs, there is no ultrasonic signal propagation blocking structure between the parabolic reflector and the liquid surface of the measured standing tank, and the focal length P is less than or equal to the radius of the measured standing tank.

[0094] The range of the pitch angle θ described in this embodiment is about -82°∽61°, and the range of the horizontal angle is about -80°∽80°. The larger the range of the pitch angle θ and the horizontal angle φ, the more the sound wave signals emitted by the ultrasonic emission source covered by the reflector, and the stronger the liquid level reflected wave received by the ultrasonic probe, the more accurate the liquid level measured by the external measurement type liquid level gauge, the larger the liquid viscosity that can be measured, and the wider the application range.

[0095] When the pitch angle θ is close to 90°, the reflector height value is close to infinity and cannot be realized, and when the maximum value is 61°, it covers a sufficient number of ultrasonic signals emitted upward. When the pitch angle θ is a negative value, the maximum value is -82°, it covers a sufficient number of ultrasonic signals emitted downward. When the horizontal angle φ is -80° or 80°, the reflector is close to the tank wall in the horizontal direction, and the reflector can be fixed to the tank wall via a joint.

[0096] In addition, the method provided by this embodiment includes, when the tank wall of the measured standing tank at the probe installation site is inclined, adjusting and selecting an appropriate part of the paraboloid as the reflecting surface of the paraboloid-type reflector, and finally determining the reflector required for measuring the measured standing tank, specifically, When the standing tank to be measured is in an inclined state, the parabolic reflector maintains an area in which ultrasonic waves can be received, and the area of ​​the received ultrasonic waves is determined as the reflector required for measuring the standing tank to be measured.

[0097] For example, under the third right-handed three-dimensional rectangular coordinate system OXYZ, When the upper part of the surface of the probe installation portion on the outer wall of the measured standing tank is inclined toward the outside of the standing tank, the direction of the ray emitted by the ultrasonic emission source is upward, and the upper area of ​​the parabolic reflector is determined as the reflector required for the measured standing tank.

[0098] When the upper part of the surface of the probe installation portion on the outer wall of the standing tank to be measured is inclined toward the inside of the standing tank, the direction of the ray emitted by the ultrasonic emission source is downward, and the lower region of the parabolic reflector is determined as the reflector required for the standing tank to be measured.

[0099] When the left side of the surface of the probe installation portion on the outer wall of the measured standing tank is inclined toward the outside of the standing tank, the direction of the ray emitted by the ultrasonic emission source is shifted to the left, and the left region of the determined parabolic reflector is determined as the reflector required for the measured standing tank, where the left region is at the negative value of the OZ axis.

[0100] When the left side of the surface of the probe installation portion on the outer wall of the standing tank to be measured is inclined toward the inside of the standing tank, the direction of the ray emitted by the ultrasonic emission source is to the right, and the right region of the determined parabolic reflector is determined as the reflector required for the standing tank to be measured, and the right region is at the positive value of the OZ axis.

[0101] [Example 5] Referring to FIG. 10, this embodiment provides a determination system for determining a reflector, the reflector is used to reflect an acoustic signal emitted by an ultrasonic emission source, and the determination system includes: A reference line segment determination module 100 for determining a reference line segment, one end point of the reference line segment being a position point T, the length of the reference line segment being equal to the focal length P of the reflector, and the position point T being the position of the ultrasonic emission source. Based on the focal length P and the position point T, a first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and a second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P and a coordinate system construction module 200 for constructing a third right-handed three-dimensional Cartesian coordinate system OXYZ, where the position point T is at a positive value of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, a length of a line segment O1T is equal to half the focal length P, and the position point T is at a positive value of the O1Y1 coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. P Y P Z P is the coordinate origin of the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is obtained after translating the length of a line segment O1T along the positive direction of the O1Y1 coordinate axis of the first right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis, and the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, the length of the line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX. p Y p Z p TX p The position point T is obtained after translating the length of a line segment TO along the positive value direction of a coordinate axis, and is at the negative value of the OX axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ. a base cross section determination module 300 for determining a base cross section of the reflector in an O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 based on the position point T and the focal length P, where the base cross section is a base parabola, a focal length of the base parabola is a focal length P, a focus of the base parabola is the position point T, and the base parabola forms a paraboloid after rotating around the O1Y1 coordinate axis as a rotation axis. The second right-handed three-dimensional Cartesian coordinate system TX p Yp Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Y p a first cross section determination module 400 for determining a first cross section of a reflector in a coordinate plane, where the first cross section is a first parabola, a focal length of the first parabola is a focal length P, and a focus of the first parabola is the location point T; The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TX p Z p A second cross section determination module 500 for determining a second cross section of the reflector in a coordinate plane, the second cross section being a circular arc, the radius of the arc being the focal length P, and the center of the arc being the location point T. a third cross section determination module 600 for determining a third cross section of the reflector in the OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on a form of an equation of the parabola in the third right-handed three-dimensional Cartesian coordinate system OXYZ, where the third cross section is a second parabola, a focal length of the second parabola is focal length P, and a focus of the second parabola is the location point T. and a reflector determination module 700 for determining a parabolic reflector based on the base cross section, the first cross section, the second cross section and the third cross section, where a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P.

[0102] For the problem of measuring the standing tank liquid level using a parabolic focusing steering gear external measurement type liquid level gauge, since the measured liquid level is horizontal, the designated direction A in which the sound wave is emitted after being reflected by the steering gear must be incident vertically upward on the horizontal liquid level, and therefore the reference line segment is a horizontal line segment perpendicular to the designated direction A. Therefore, the coordinate axis O1X1 of the established first right-handed rectangular coordinate system O1X1Y1Z1 is parallel to the reference line segment, and the direction of the coordinate axis O1X1 is rightward.

[0103] When the designated direction A directed after the sound wave is reflected by the steering gear is any direction, the reference line segment is a line segment perpendicular to the designated direction A. The coordinate axis O1X1 of the first right-handed rectangular coordinate system O1X1Y1Z1 is parallel to the reference line segment, and the direction of the coordinate axis O1X1 is the same as the sound wave emission direction.

[0104] The reflector paraboloid equations used in the present invention, expressed in three-dimensional right-handed rectangular coordinate system, can also be transformed into three-dimensional right-handed polar coordinate system form by conventional coordinate transformations.

[0105] The present invention uses parabolic function calculation to determine the reflector in a reduced application scope where the reflection direction is parallel, and can easily calculate the reflection surface data with any accuracy requirements, verify by drawing, save the labor time of calculating the accuracy of the numbers, reduce the amount of design calculation work, shorten the design time, improve the production efficiency, effectively achieve the purpose of measuring the standing tank liquid level from the side wall with an external measurement type liquid level gauge, which is more practical and easier to be widely used.

[0106] Each embodiment in this specification is described step by step, and each embodiment mainly describes the difference between other embodiments, and the same or similar parts between each embodiment can be referred to each other. In this specification, specific examples are applied to explain the principle and embodiment of the present invention, and the above description of the embodiment only contributes to understanding the method of the present invention and its core idea, and at the same time, for those skilled in the art, the form for implementing the invention and the scope of application may be changed according to the idea of ​​the present invention. In summary, the contents of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for determining a reflector is used to reflect an ultrasonic signal emitted by an ultrasonic emission source, the method comprising the steps of: determining a reference line segment, one end point of the reference line segment being a position point T, the length of the reference line segment being equal to a focal length P of the reflector, the position point T being the position of the ultrasonic emission source; Based on the focal length P and the position point T, a first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ , second right-hand three-dimensional rectangular coordinate system TX Ｐ Y Ｐ Z Ｐ and constructing a third right-handed three-dimensional Cartesian coordinate system OXYZ, where the position point T is located within the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ Y １ At the positive value of the coordinate axis, the line segment O １ The length of T is equal to half the focal length P, and the position point T is located in the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ is the coordinate origin of the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ is the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ Y １ Along the positive direction of the coordinate axis, a line segment O １ The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is obtained after translating the length of the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ TX ｐ a coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, a length of a line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ TX ｐ obtained after translating the length of a line segment TO along the positive value direction of a coordinate axis, said position point T being at the negative value of the OX axis of said third right-handed three-dimensional Cartesian coordinate system OXYZ; Based on the position point T and the focal length P, the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ X １ Y １ determining a base cross section of the reflector in a coordinate plane, where the base cross section is a base parabola, a focal length of the base parabola is the focal length P, a focus of the base parabola is the location point T, and the base parabola is a coordinate system of the reflector, １ Y １ After rotating around the coordinate axis, a paraboloid is formed. The second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TX ｐ Y ｐ determining a first cross section of the reflector in a coordinate plane, where the first cross section is a first parabola, a focal length of the first parabola is the focal length P, and a focus of the first parabola is the location point T; The second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TX ｐ Z ｐ determining a second cross section of the reflector in a coordinate plane, said second cross section being a circular arc, a radius of said arc being said focal length P, and a center of said arc being said location point T; determining a third cross section of a reflector in an OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on a form of an equation of the parabola in the third right-handed three-dimensional Cartesian coordinate system OXYZ, where the third cross section is a second parabola, a focal length of the second parabola is a focal length P, and a focus of the second parabola is the location point T; determining a parabolic reflector based on the base cross section, the first cross section, the second cross section and the third cross section, wherein a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P.

2. The first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ X １ Y １ The equation of the basis parabola in the coordinate plane is x １ ２ = 2 Py １ where x １ Yes １ X １ Y １ Coordinate plane X １ Coordinate, y １ Yes １ X １ Y １ Y of the coordinate plane １ are the coordinates, The first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ The equation of the paraboloid at x １ ２ +z １ ２ = 2 Py １ where x １ is the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ X １ is the coordinate on the coordinate axis, and １ is the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ Y １ is a coordinate on the coordinate axis, z １ is the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ Z １ are the coordinates on the coordinate axes, The second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ The equation of the paraboloid at x ｐ ２ +z ｐ ２ = 2P(y ｐ +P / 2), where x ｐ is a coordinate on the TXp coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TXpYpZp, and yp is a coordinate on the TXp coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TY ｐ is a coordinate on the coordinate axis, z ｐ is the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TZ ｐ are the coordinates on the coordinate axes, The equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ has the form (x + P) ２ +z ２ = 2Py + P ２ 2. The method of claim 1, wherein x is a coordinate on the OX coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ, y is a coordinate on the OY coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ, and z is a coordinate on the OZ coordinate axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ.

3. The equation of the first parabola is x ｐ ２ = 2 Py ｐ +P ２ and In the first cross section, the ultrasonic emission source is located in the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TX ｐ Y ｐ From the coordinate origin T on the coordinate plane, any point (x ｐ , y ｐ The pitch angle entered into θ = art(y ｐ / x ｐ ), where x ｐ is the projection point (x ｐ , y ｐ ) TX ｐ is the coordinate value, y ｐ is the projection point (x ｐ , y ｐ )'s TY ｐ The pitch angle range is determined by the fact that the ultrasonic signal emitted by the ultrasonic emission source is within the range of the TX ｐ Y ｐ is the range of radiation angles in the coordinate plane, The equation of the arc is x ｐ ２ +z ｐ ２ =P ２ and The ultrasonic emission source is located in the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ From the coordinate origin T of the arc, an arbitrary point (x ｐ , z ｐ The horizontal angle of incidence at ｐ / x ｐ ), where x ｐ is that the ultrasonic signal emitted from the position point T is ｐ Z ｐ A projection point (x ｐ , z ｐ ) TX ｐ is the coordinate value, z ｐ is that the ultrasonic signal emitted from the position point T is ｐ Z ｐ A projection point (x ｐ , z ｐ ) is a TZp coordinate value incident on the ultrasonic wave source, and the horizontal angle range is a range of radiation angles on the TXpZp coordinate plane of the ultrasonic signal emitted by the ultrasonic emission source, The equation of the second parabola is z ２ 3. The method of claim 1, wherein: =2Py, and the second parabola lies in the OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ.

4. The reflector determination method according to claim 1, characterized in that the pitch angle range and the horizontal angle range are all determined according to actual conditions and work needs, there is no ultrasonic signal propagation blocking structure between the parabolic reflector and the liquid surface of the measured standing tank, and the focal length P is less than or equal to the radius of the measured standing tank.

5. moreover, The method for determining a reflector according to claim 1, characterized in that, when the measured standing tank is in an inclined state, the parabolic reflector maintains an area in which ultrasonic waves can be received, and the area of ​​the received ultrasonic waves is determined as the reflector required for measuring the measured standing tank.

6. A determination system is used to determine a reflector, the reflector being used to reflect an ultrasonic signal emitted by an ultrasonic emission source, the determination system comprising: a reference line segment determining module for determining a reference line segment, one end point of the reference line segment being a position point T, the length of the reference line segment being equal to a focal length P of the reflector, and the position point T being the position of the ultrasonic emission source; Based on the focal length P and the position point T, a first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ , second right-hand three-dimensional rectangular coordinate system TX Ｐ Y Ｐ Z Ｐ and a coordinate system construction module for constructing a third right-handed three-dimensional Cartesian coordinate system OXYZ, where the position point T is located within the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ Y １ At the positive value of the coordinate axis, the line segment O １ The length of T is equal to half the focal length P, and the position point T is located in the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ is the coordinate origin of the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ is the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ Y １ Along the positive direction of the coordinate axis, a line segment O １ The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is obtained after translating the length of the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TX ｐ a coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is the other end point of the reference line segment, a length of a line segment TO is equal to the focal length P, and the third right-handed three-dimensional Cartesian coordinate system OXYZ is located at the positive value of the coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TX ｐ obtained after translating the length of a line segment TO along the positive value direction of a coordinate axis, said position point T being at the negative value of the OX axis of said third right-handed three-dimensional Cartesian coordinate system OXYZ; Based on the position point T and the focal length P, the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ O １ X １ Y １ a base cross section determination module for determining a base cross section of the reflector in a coordinate plane, where the base cross section is a base parabola, a focal length of the base parabola is the focal length P, a focus of the base parabola is the location point T, and the base parabola is a vertex of the O １ Y １ After rotating around the coordinate axis, a paraboloid is formed. The second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TX ｐ Y ｐ a first cross section determination module for determining a first cross section of the reflector in a coordinate plane, where the first cross section is a first parabola, a focal length of the first parabola is the focal length P, and a focus of the first parabola is the location point T; The second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ Based on the form of the equation of the paraboloid in the second right-handed three-dimensional Cartesian coordinate system TX ｐ Y ｐ Z ｐ TX ｐ Z ｐ a second cross section determining module for determining a second cross section of the reflector in a coordinate plane, the second cross section being a circular arc, the radius of the circular arc being the focal length P, and the center of the circular arc being the location point T; a third cross section determination module for determining a third cross section of the reflector in an OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on a form of an equation of the parabola in the third right-handed three-dimensional Cartesian coordinate system OXYZ, where the third cross section is a second parabola, a focal length of the second parabola is the focal length P, and a focus of the second parabola is the location point T; and a reflector determination module for determining a parabolic reflector based on the base cross section, the first cross section, the second cross section and the third cross section, wherein a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P.

7. A reflector determined by the reflector determination method according to any one of claims 1 to 5, characterized in that the reflector is used to reflect an ultrasonic signal emitted by an ultrasonic emission source, The reflector is a parabolic reflector, a center point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, and a focal length of the parabolic reflector is the focal length P; The coordinates of the center point of the reflector in the third right-handed rectangular coordinate system OXYZ are the coordinate origin O (0,0,0), and the coordinates of the center point of the reflector in the second right-handed rectangular coordinate system TX ｐ Y ｐ Z ｐ The coordinates of the center point of the reflector in the first right-handed rectangular coordinate system O １ X １ Y １ Z １ The coordinates of the center point of the reflector at are (P, P / 2, 0), Here, the first right-handed three-dimensional Cartesian coordinate system O １ X １ Y １ Z １ , second right-hand three-dimensional rectangular coordinate system TX Ｐ Y Ｐ Z Ｐ and an equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ is used to form a data table (x, y, z) of the paraboloid, and to manufacture a paraboloid-type reflector based on the data table (x, y, z) of the paraboloid.

8. A standing tank external measurement type liquid level gauge, comprising: a liquid level determining module; an ultrasonic signal source positioner; and a reflector as claimed in claim 7; The ultrasonic signal source positioner includes an ultrasonic emitting probe, an ultrasonic emitting circuit connected to the ultrasonic emitting probe, an ultrasonic receiving probe, an ultrasonic receiving circuit connected to the ultrasonic receiving probe, and an ultrasonic intensity indicator, wherein the ultrasonic emitting probe emits ultrasonic waves from the outside of the standing tank wall to the tank wall, and the ultrasonic receiving probe receives ultrasonic signals from the inside of the standing tank side wall, and uses the intensity indication displayed by the ultrasonic intensity indicator to find the strongest position of the received ultrasonic signal, and determine the position point T of the ultrasonic emitting probe formed on the inside of the standing tank wall after the ultrasonic waves emitted from the outside of the standing tank wall penetrate the tank wall; The liquid level determination module is composed of an external measurement type liquid level gauge, and the external measurement type liquid level gauge is used to measure the liquid level in the tank from outside the standing tank.

9. 9. The standing tank external measurement type liquid level gauge according to claim 8, further comprising a support portion, the support portion being used to install the reflector in a standing tank to be measured.

10. 10. The standing tank external measurement type liquid level gauge according to claim 9, wherein the support portion includes a work platform, and a center line of symmetry of the work platform overlaps with an OX axis in a third right-handed three-dimensional Cartesian coordinate system OXYZ.

11. The support further includes at least three pipe-shaped columns, each of which has an adjustable length, the first column, the second column, and the third column, which are connected and fixed to each other via a lateral connecting rod between the first column, the second column, and the third column; The upper end of the first support passes from near the semicircular groove M of the support and near the semicircular groove N of the reflector, the second support and the third support are located on both sides of the first support, respectively, and the upper end of the second support and the upper end of the third support are all fixed to the support; The highest point (X Ｎ , Y Ｎ , 0) is the semicircular groove N, the semicircular groove M is on the symmetrical center line of the worktable, and the coordinates of the semicircular groove M in the third right-handed three-dimensional Cartesian coordinate system OXYZ are (X Ｎ , 0, 0), The standing tank external measurement type liquid level gauge according to claim 9, characterized in that, during operation, the lower end of the first support, the lower end of the second support, and the lower end of the third support are all fixed to the bottom of the standing tank to be measured.

12. The standing tank external measurement type liquid level gauge according to claim 9, characterized in that the reflector is fixed to the support to form a steering gear, and the steering gear is installed on the inner wall of the standing tank to be measured.

13. An installation method, which is used to install the standing tank external measurement type liquid level gauge according to claim 8, determining a selected region, the selected region including a spatial region between a sonic signal source and a reflector and a spatial region between the reflector and a liquid surface directly above the reflector, wherein the standing tank to be measured does not have a structure that blocks sonic propagation within the selected region; determining a position of an ultrasonic source on the inner wall of the standing tank to be measured within the selected area using an ultrasonic signal source positioner; Determining the location of the center point of a reflector according to the position of the ultrasonic emission source and a focal length P; and installing the reflector according to the placement point, thereby overlapping a center point of the reflector with the placement point, and a focal point of the reflector being a position point of the ultrasonic emission source.

14. the ultrasonic signal source positioner includes an ultrasonic emitting circuit, an ultrasonic emitting probe, an ultrasonic receiving circuit, an ultrasonic receiving probe, and an ultrasonic intensity indicator connected to the ultrasonic receiving probe; In the selected region, determining the position of the ultrasonic emission source on the inner wall of the standing tank to be measured using the ultrasonic signal source positioner specifically includes: The ultrasonic wave emitting probe is installed in a target area of ​​the outer wall of the standing tank to be measured, and the target area faces the selected area; Installing the ultrasonic receiving probe on an inner wall corresponding to the ultrasonic emitting probe; Adjusting the position of the ultrasonic emitting probe and the ultrasonic receiving probe according to the ultrasonic intensity indicator until determining a position where the signal is strongest, the position where the signal is strongest is located in the target area, and the position where the signal is strongest is a position point of the ultrasonic emitting source; 14. The method of claim 13, further comprising: marking selected ultrasonic emitting probe locations on the outside of the standing tank sidewall and location points on the inside of the standing tank sidewall, respectively.

15. The focal length scale is a straight rod having a length equal to the focal length P, one end of the focal length scale is a sharp tip, and the other end has a magnetic attraction end, and the end face of the magnetic attraction end is perpendicular to the axial direction of the focal length scale. The arrangement of the center point of the reflector is determined according to the position of the ultrasonic emission source and the focal length P, specifically, Fixing a magnetically attracted end of a focal length scale to a position point of the ultrasonic emission source by magnetic force; 15. The installation method according to claim 14, further comprising: adjusting a position of a reflector, inserting a sharp tip of the focal length scale into a small hole at a reflector center point O, and further positioning the reflector center point at a placement point.

16. Specifically, the placement of the reflector in accordance with the placement point includes: Installing a reflector on a support in response to the placement point; The installation method according to claim 13, further comprising adjusting the pitch angle and horizontal angle of the reflector to set the pitch angle θ of the reflector to 0 degrees and the horizontal angle φ to 0 degrees, and further leveling two mutually perpendicular level gauges at the support portion.

17. Specifically, the pitch angle and horizontal angle of the reflector are adjusted to make the pitch angle θ of the reflector 0 degrees and the horizontal angle φ of the reflector 0 degrees, and the two mutually perpendicular level gauges at the support portion are made horizontal. A weight wire is hung in a semicircular groove N of the reflector, and the weight on the weight wire is allowed to hang freely; Adjusting a pitch angle of a reflector in the TXY coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ and a horizontal angle of a reflector in the TXZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ, so that the copper wire is placed in the semicircular groove M, but is not in contact with an edge of the semicircular groove M; Adjusting the pitch angle and horizontal angle of the reflector to level two mutually perpendicular level gauges at the support part; Here, the third right-handed three-dimensional Cartesian coordinate system OXYZ is constructed based on the focal length P and the center point of the reflector, and the highest point (X Ｎ , Y Ｎ , 0) is the semicircular groove N, and the coordinates of the semicircular groove M in the third right-handed three-dimensional Cartesian coordinate system OXYZ are (X Ｎ 17. The method of claim 16, wherein the azimuth angle is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,

18. Specifically, the pitch angle and horizontal angle of the reflector are adjusted to make the pitch angle θ of the reflector 0 degrees and the horizontal angle φ of the reflector 0 degrees, and the two mutually perpendicular level gauges at the support portion are made horizontal.

17. The installation method of claim 16, further comprising: adsorbing and fixing a magnetic base of the laser ranging calibrator to a position point of the ultrasonic emission source, an end surface of the magnetic base of the laser ranging calibrator being perpendicular to the direction of the laser emitted by the laser ranging calibrator, adjusting the position and shape of a reflector using a scanning function of the laser ranging calibrator, making the laser emitted from the laser ranging calibrator incident on the center point of the reflector, and the distance displayed by the laser ranging calibrator equal to a focal length P, setting a pitch angle θ of the reflector to 0 degrees and a horizontal angle φ to 0 degrees, and further leveling two mutually perpendicular level gauges on the support part.

19. Specifically, adjusting the position and shape of the reflector using the scanning function of the laser distance measuring calibrator includes: Controlling the graphic signal emitted by the laser distance measuring calibrator, the graphic signal being reflected by a flat reflector installed above a reflector and adjusted horizontally, and being focused at a position close to an ultrasonic emission source after being reflected by the reflector, forming a circular bright spot; The installation method of claim 18, further comprising: adjusting the pitch angle, horizontal angle, shape and installation position of the reflector according to the shape of the graphic signal focused on a position close to the ultrasonic emission source, so as to make the graphic signal close to the ultrasonic emission source as small as possible as a circular graphic.

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