Determination method, system, reflector, standing tank external measurement type liquid level meter and its installation method

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 its installation method. [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 for the reflecting surface in existing external measurement liquid level gauges involves using a geometrical drawing calculation method to design all levels of the N-level reflecting surface, then calculating the boundary point positions of each level reflecting surface step by step, and then designing the reflecting surface according to the boundary point positions of the N-level reflecting surface. This reflecting surface can reflect light emitted by the ultrasonic measuring head in any direction, making it versatile. However, there is no specific calculation formula for the reflecting surface during the design process, making the process complicated and requiring a large amount of work. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Chinese 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, system, reflector, standing tank external measurement liquid level gauge and its installation method, which can design a reflector without the need to calculate the boundary point positions of each level reflecting surface step by step, reduce the amount of calculation work, and improve work efficiency. [Means for solving the problem]

[0005] To achieve the above object, the present invention provides the following solutions: In a first aspect, the present invention provides a determination method for determining a reflector, the reflector being used to reflect an ultrasonic signal emitted by an ultrasonic emission source, the determination method comprising: determining a reference line segment, one end point of which is a position point T, the length of which is equal to the focal length P of the reflector, and the position point T is 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, 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 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 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 the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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. P Y P Z P TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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, and 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 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 location 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 the reflector on 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, wherein 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 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 Y p Z p Based on the equation of the paraboloid in the form of 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, wherein 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 equation of the paraboloid in the form of 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, the second cross section being an arc, the radius of the arc being the focal length P, and the center of the arc being the location point T; determining a third cross section of the reflector on the OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on the form of an equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ, wherein 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 determining a parabolic reflector based on the basic 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.

[0006] In a second aspect, the present invention provides a determination system for determining a reflector, said reflector being used to reflect an ultrasonic signal emitted by an ultrasonic emission source, said 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 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 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, 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 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 the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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. P Y P Z P TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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, and 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 isP 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 location point T being at the negative value of the OX axis of said third right-handed three-dimensional Cartesian coordinate system OXYZ; a basic cross section determination module for determining a basic cross section of the reflector on an O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 according to the position point T and the focal length P, wherein the basic cross section is a basic parabola, a focal length of the basic parabola is a focal length P, a focus of the basic parabola is the position point T, and the basic 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 equation of the paraboloid in the form of 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 on a coordinate plane, wherein 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 equation of the paraboloid in the form of 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 on a coordinate plane, the second cross section being an 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 for determining a third cross section of the reflector on an OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on an equation form of the paraboloid 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; a reflector determination module for determining a parabolic reflector based on the basic 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.

[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, 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; 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 Cartesian 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 tank from outside the standing 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: determining a selected area, wherein the standing tank to be measured does not have an ultrasonic signal propagation blocking structure between directly above the selected area and the liquid surface of the standing tank to be measured; Using an ultrasonic signal source positioner to determine the position of an ultrasonic emission source on the inner wall of the standing tank to be measured within the selected area; Determining the placement point of the center point of the reflector according to the position point of the ultrasonic emission source and the focal length P; The reflector is positioned according to the location point, so that the center point of the reflector overlaps with the location point, and the focal point of the reflector is the location point of the ultrasonic emission source. [Effects 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 external measuring type liquid level gauge for standing tanks. When the external measuring type liquid level gauge for standing tanks is in operation, its ultrasonic emitting probe is installed on the outer wall of the standing tank to be measured. The ultrasonic waves emitted from the ultrasonic emitting probe pass through the side wall of the standing tank and generate an ultrasonic emitting source on the inner wall of the standing tank to be measured. The location point of the ultrasonic emitting source is also the focus of the reflector. The sound signal emitted by the ultrasonic emitting source is emitted to the reflector and reflected by the reflector, and then emitted parallel to the preset direction. After being reflected by the liquid level of the standing tank to be measured, it can return to the ultrasonic emitting source position along the original path, then pass through the side wall of the standing tank and be received by the measuring head of the external measuring type liquid level gauge installed outside the side wall of the standing tank. The external measuring 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, the reflector provided by the present application does not need to calculate the position of the boundary point 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 work efficiency is achieved. [Brief explanation 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 will briefly describe 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 any creative efforts.

[0012] [Figure 1] 1 is a structural schematic diagram of a reflector according to the present invention; [Figure 2] 1 is a diagram showing an actual standing tank external measurement type liquid level gauge according to the present invention. [Figure 3] 3A, 3B, and 3C are schematic structural diagrams of a reflector according to the present invention when it is installed on a workbench, respectively. FIG. 3A is a schematic structural diagram of the entire reflector, FIG. 3B is a front view, and FIG. 3C is a plan view. [Figure 4] 1 is a structural schematic diagram of a steering gear according to the present invention; [Figure 5] FIG. 2 is a schematic diagram of the actual installation of the steering gear according to the present invention. [Figure 6] 1 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 flowchart of a method for determining a reflector according to the present invention. [Figure 8(a)] 1 is a first cross-sectional schematic view according to the present invention; FIG. [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] 1 is a structural schematic diagram of a reflector determination system according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0013] The following provides a clear and complete description of the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments, and all other embodiments obtained by those skilled in the art without any creative efforts based on the embodiments of the present invention are all within the protection scope of the present invention.

[0014] The present invention aims to provide a determination method, system, reflector, standing tank external measurement liquid level gauge and its installation method, which can design a reflector without the need to calculate the boundary point positions of each level reflecting surface step by step, reduce the amount of calculation work, and improve work efficiency.

[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 detailed description of the invention.

[0016] In order to enable the external measurement type liquid level gauge for standing tanks 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 various directions emitted by the external measurement type liquid level gauge probe can be reflected by the reflector and then incident on the liquid level of the standing tank in a parallel and perpendicular direction.

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

[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 Cartesian 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 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 the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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. P Y P Z P TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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, and 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 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 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 basic cross section of the reflector on the O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, where the basic cross section is a basic parabola, the focal length of the basic parabola is the focal length P, the focus of the basic parabola is the position point T, and the basic parabola forms a paraboloid after rotating around 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 Cartesian coordinate system O1X1Y1Z1 is 2 =2Py1, where x1 is the X1 coordinate on the O1X1Y1 coordinate plane, and y1 is the y1 coordinate on 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 coordinate axis, z p is the second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p TZ p are coordinates on the coordinate axes,

[0026] The equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ is of 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 and in the first cross section, the ultrasonic wave 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 ) the pitch angle is 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, and the ultrasonic signal emitted by the ultrasonic emission source is 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 parabolic reflector, any point (x p ,z p ) is incident on the horizontal angle θ=art(z p / x p ), where x p is the ultrasonic signal emitted from the position point T. p Z p The projection point (x p ,z p ) is the TXp coordinate value incident on z pis the ultrasonic signal emitted from the position point T. p Z p The projection point (x p ,z p ) TZ incident on 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 the second parabola lies in the OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ.

[0029] The reflector is made of a material such as steel or brass whose acoustic impedance is significantly greater than that of the measured liquid. For example, the acoustic impedance of liquid is 1, the acoustic impedance of steel is 45, and the sound reflection coefficient in liquid is 1-1 / 45=97.8%. To prevent interference caused by the waves reflected 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 component whose back and front are not parallel. For ease 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 of the reflector. 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) on the cross section of the XOY coordinate plane of the third right-handed three-dimensional Cartesian 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, eliminating the need to calculate the positions of boundary points of each level reflecting surface step by step, thereby reducing the amount of calculation work and achieving the purpose of improving work efficiency, and facilitating the widespread application of parabolic reflectors.

[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 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, and the liquid level determination module is composed of an external measurement type liquid level gauge, which is used to measure the liquid level in the tank from outside the tank.

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

[0035] The support part described in this embodiment can 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 work table 2, and the symmetry center line of the work table 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 focal point 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 edge 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 the M(X M ,0,0) point. M A semicircular groove M with a diameter of Φ0.5∽Φ1 is drilled at the (0,0,0) point. A level gauge aligned with the OX coordinate axis direction and a level gauge aligned with 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 part includes at least three pipe-shaped supports 3, each of which has an adjustable length and is fastened with a screw, and which are respectively a first support a, a second support b, and a third support c, and are connected and fixed to each other via a lateral connecting rod between the first support a, the second support b, and the third support c.

[0041] The upper end of the first support passes successively from near the semicircular groove M of the support part 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 part (or points b and c of the workbench 2 shown in Figure 3).

[0042] The highest point N(X) of the reflector 1 on the OXY coordinate plane of the third right-handed three-dimensional rectangular coordinate system OXYZ N ,YN , 0) is the semicircular groove N, and the semicircular groove M is on the symmetrical center line of the work table. 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 on the tank bottom, for example, 1. A reflector cannot be installed on 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, if other equipment is blocked inside the tank or the curvature of the elliptical tank bottom is large, that is, if a reflector cannot be installed on 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 the reflector and the support part, that is, the reflector is fixed to the support part 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 must 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 location: Select a low position in the tank for ease of operation, but do not place it in the liquid residue sediment layer accumulated at the bottom of the tank to avoid the sediment obstructing the propagation of sound waves. Also avoid the upper structure 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 meter, and the method includes: Step 601: Determine a selected area, the selected area including the spatial area between the ultrasonic signal source and the reflector and the spatial area between the reflector and the 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: Using an ultrasonic signal source positioner to determine the position of an ultrasonic source on the inner wall of the standing tank to be measured within the selected area; Step 603: determining the location of the center point of the reflector according to the location point of the ultrasonic emission source and the focal length P; Step 604: Install the reflector according to the location point, so that the center point of the reflector and the location point overlap, and the focus 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: Step A: placing the ultrasonic wave emitting probe on a target area on 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 the inner wall corresponding to the ultrasonic emitting probe; Step C: Adjust the position of the ultrasonic emitting probe and the ultrasonic receiving probe according to the ultrasonic intensity indicator, until the position of the strongest signal is determined, the position of the strongest signal is located in the target area, and the position of the strongest signal 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 Figure 3, step 603 specifically includes: fixing the magnetically adsorbed 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 has a sharp tip shape, 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, adsorb the magnetic base end of the focal length scale to the ultrasonic emission source position marked on the inner wall of the standing tank, set and adjust the position of the reflector, insert the sharp tip of the focal length scale into the small hole at the reflector center point O, and position the reflector center point at the placement point. Step a: Fix the suction end of the focal length scale 4 to the position point of the ultrasonic emission source, and the focal length scale 4 includes a magnetic base, an suction end, a sharp tip, and a scale pole connecting the suction end and the sharp tip.

[0053] During 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 wave emission source.

[0054] Step b: Using the length of the focal length scale 4 as the focal length P, determine that the position where 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 location of the center point of the reflector 1, the reflector is installed, 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. By utilizing 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 Achieve accurate positioning in

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

[0057] For a standing tank with a diameter greater than 4 meters, e.g., 15 meters, the distance between the reflector and the side wall of the standing tank must be increased, e.g., 1000 mm or more, to prevent the presence of a support structure between the reflector and the top of the floating tank, which would interfere with ultrasonic propagation. In this case, the focal length P must be relatively large, e.g., 1000 mm or more. A focal length scale of 1000 mm or more must be used, which makes it difficult to maintain a horizontal line. In this case, a laser distance measuring calibrator can be used. The magnetic base of the laser distance measuring calibrator is attached to the ultrasonic source by suction, and the positions of the reflector and work platform are adjusted so that the laser emitted from the laser distance measuring calibrator is incident on point O of the reflector, with the displayed distance equal to the focal length P. Next, the pitch and horizontal angles of the reflector and work platform are adjusted to set the reflector pitch angle θ to 0 degrees and the horizontal angle φ to 0 degrees, and two mutually perpendicular level gauges on the support are leveled.

[0058] Step 2 further Step 21: Install a flat reflector 6 horizontally directly above the reflector 1, and install a level gauge on each of the two mutually perpendicular edges of the flat reflector 6 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 ranging 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 ranging 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 workbench and adjusted horizontally. The reflected signal is focused on the ultrasonic emission source to form a small, round, bright spot. This determines whether the shape and installation of the reflector are very accurate. Specifically, The graphic signal emitted by the laser distance measuring calibrator is controlled, and 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, and the graphic signal is 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 at a position close to the ultrasonic emission source, and the graphic signal close to the ultrasonic emission source is made into a circular graphic that is as small as possible.

[0060] In step 2, another simple method for adjusting the installation angle of the steering gear so that the pitch angle and horizontal angle of the reflector are 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 work table so that 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 level the two level gauges installed perpendicular to each other on the support, thus easily completing the accurate angular positioning of the work table of the reflective surface.

[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 also necessary to use the weight 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 has a neodymium-iron-boron magnet installed at each end, and the ends are connected by a rubber band.

[0064] Specifically, when the hook is hung in the semicircular groove N of the reflector and the weight wire is freely and statically suspended, 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 enabling the precise angles of the three directions when the reflector is installed to be determined quickly and accurately.

[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; and adjusting the pitch angle of the reflector 1 in the TXY coordinate plane of the first right-handed three-dimensional Cartesian coordinate system OXYZ and the horizontal angle in the TXZ coordinate plane of the first right-handed three-dimensional Cartesian 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, thereby 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 enable the use of an auxiliary fixture, the auxiliary fixture consists of two neodymium-iron-boron magnets and a rubber band connecting the two magnets. During installation, one neodymium-iron-boron magnet on the auxiliary fixture is attracted to point A on workbench 2, and the other neodymium-iron-boron magnet on the other end is attracted to the bottom of focal point T inside the tank wall. The tension of the rubber band helps pull the steering gear to the tank wall and temporarily fix it, making position adjustment and calibration easier.

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

[0069] Because the tank wall at the probe installation site is not guaranteed to be exactly perpendicular to the horizontal plane, the focal length scale attached perpendicular to the side wall does not guarantee that it is exactly horizontal, nor does it guarantee that it is exactly perpendicular to the side wall of the standing tank. However, the focal length scale 4 or the laser distance measuring scanner can ensure 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, and then leveling is performed using level gauges installed perpendicular to each other on the steering gear workbench 2. The angle of the reflector and the shape of the reflecting surface can then be fine-tuned using the laser distance measuring scanner so that the laser emitted from the laser distance measuring scanner is reflected upward through the reflector 1 onto the horizontally installed flat reflector 6, and then reflected through the reflector 1 and returned to the ultrasonic emission source T. The shape of the spot is a small circular dot, and in this way, pitch angle and horizontal angle errors of the focal length scale do not affect the ability of the reflector 1 to accurately reflect and focus ultrasonic waves from each direction and return them to the ultrasonic emission source.

[0070] When the external measuring level gauge is in operation, 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 location of the ultrasonic emission source is also the focus of the reflector, the sound signals emitted by the ultrasonic emission source are emitted to the reflector, and after being reflected by the reflector, they all radiate parallel to the preset direction, and after being reflected by the liquid level of the standing tank to be measured, they can return along the original path 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 signals emitted by the ultrasonic probe and the sound signals received by the ultrasonic probe. Obviously, the reflector provided in this application does not need to calculate the position of the boundary point of each level reflecting surface step by step, and can satisfy the requirement that the rays emitted from the focus in any direction forward are all radiated parallel to the preset direction after being reflected by the reflector, that is, the purpose of reducing the calculation workload and improving 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 embodiment 1, where the reflector is used to reflect the acoustic signal emitted by the 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 equal to or less than D / 2. For example: the horizontal cross section within the standing tank where the reference line segment is located is the standard plane of the standing tank to be measured, and the focal length P is equal to or less than the radius of the standard plane. For example, if you want to measure the depth from the oil surface to the wellhead in an oil well, D = 200 mm, and 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 is P=D / 2=200 mm. Furthermore, when the diameter D of the standing tank being measured is very large, such as a vertical storage tank with a diameter D between 500 mm and 50 meters, the principle for determining the focal length P is to ensure that there are no structures, such as pipes or crossbeams, obstructing ultrasonic propagation between the reflecting surface and the liquid surface or the floating roof floating on the liquid surface, and that ultrasonic waves are not radiated to the circular sealing hose at the edge of the floating roof. For large-diameter standing tanks, the structural components within the tank are relatively large, and the reflecting surface must be located farther away from the sidewall. Therefore, the focal length P of the selected parabolic reflector must be larger. For standing tanks with a diameter of 4 meters or more, the focal length P can be approximately 1000 mm. If the reflector is larger than the 600 mm diameter manhole of the standing tank, it must be divided into several sections, each of which must be fed through the manhole into the standing tank and then precisely assembled to form 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 of which is the origin of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1 and the other end point of which 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 is obtained after translating the length of the line segment O1T along the positive direction of the O1Y1 coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX 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 coordinate axis of 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 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, and 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 P Y P Z P TX p The position point T is obtained after translating the length of the line segment T0 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 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 Cartesian coordinate system OXYZ overlaps with the coordinate axis of the second right-handed three-dimensional Cartesian 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 basic cross section of the reflector on the O1X1Y1 coordinate plane of the first right-handed three-dimensional Cartesian coordinate system O1X1Y1Z1, where the basic cross section is a basic parabola, the focal length of the basic parabola is focal length P, the focus of the basic parabola is the position point T, and the basic 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 equation of the paraboloid in the form of 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, the focal length of the first parabola is focal length P, and the focus of the first parabola is the position point T.

[0076] Step 705: The second right-handed three-dimensional Cartesian coordinate system TX p Y p Z p Based on the equation of the paraboloid in the form of 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 an 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: Determine a third cross section of the reflector on the OYZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ based on the form of the equation of the paraboloid in 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 selected arbitrarily according to the specific situation, and is not exclusive. For example, the reflector can be inserted into the standing tank through a manhole (i.e., a circular hole with a diameter of less than 600 mm and a sealing cover, which is pre-opened in the side wall of the standing tank for the contractor to enter the tank), and then installed. The reflector must be shaped like a thin rectangular rod with a width of less than 600 mm. Also, for example, in order to reduce the cost of the mold for processing the reflecting surface, the reflecting surface can be processed into an elliptical shape to reduce the area of ​​the mold. P The projection along the coordinate axis direction, 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 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. Using Figure 8(b) as an example, TX P The projection along the axial direction is the top and bottom edges of the rectangular reflector. PAll projections in the axial direction are circular arcs. Any ray TD emitted from the focal point T with a departure angle θ > 0 degrees, and ray DP after reflection by the reflector, is incident vertically upwards on 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 is incident vertically upwards on 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 are incident vertically upwards on point P1 on the horizontal liquid surface. Reflected rays PD, P0O, and P1D1 after reflection by the liquid surface all enter the reflector vertically downwards, and rays DT, OT, and D1T after reflection by the reflector all enter the focal point T. Therefore, the characteristics of the reflector are such that all rays emitted in any direction forward from the focal point T are reflected by the reflector and are incident on point TY 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 focus 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 on the coordinate plane O1X1Y1, and y1 is the Y1 coordinate on the coordinate plane O1X1Y1. The parabola of the base cross section rotates around the coordinate axis O1Y1 to form a paraboloid, and the angular range of the paraboloid that rotates 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, 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 defined in the second right-handed three-dimensional Cartesian coordinate system TX P Y P Z P The reflector paraboloid passes through the points (P,0,0), (-P,0,0), (0,-P / 2,0), (0,0,P), and (0,0,-P). 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 Cartesian coordinate system OXYZ and the 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 Cartesian 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 resulting first parabolic function 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 Figure 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 the center and P as the radius, and the upper and lower edges of the reflector are concentric circular arcs with T as the 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 the paraboloid function in the third right-handed triangular coordinate system, calculates the y value corresponding to each pair of (x,z) numerical values, lists a data table of the paraboloid, and according to this data table, processes a processing mold for the paraboloid reflector to manufacture the paraboloid reflector.

[0089] The range of the pitch angle is set so that the ultrasonic wave emission source is positioned from the position point T to the position point TX. 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 determined by the ultrasonic wave source position T to TX. P The TX of the ultrasonic signal emitted along the coordinate direction P Z P The range of the radiation angle φ on the coordinate plane is the 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, and the unit is 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 the actual conditions and work needs, and there is no ultrasonic signal propagation blocking structure between the parabolic reflector and the liquid surface of the standing tank to be measured, and the focal length P is less than or equal to the radius of the standing tank to be measured.

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

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

[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 can cover a sufficient number of ultrasonic signals emitted upward. When the pitch angle θ is a negative value, the maximum value is -82°, it can cover 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 can be fixed to the tank wall via a joint.

[0096] Furthermore, the method provided by this embodiment includes, when the tank wall of the probe installation portion of the measured standing tank is inclined, adjusting and selecting an appropriate portion 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 standing tank to be measured 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 region of the parabolic reflector is determined as the reflector required for the standing tank to be measured.

[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 standing tank to be measured 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 standing tank to be measured, and the left region is at a 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 shifted 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 which is a position point T, the length of which is equal to the focal length P of the reflector, and the position point T is 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, 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 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 the coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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. p Y p Z p TX p The coordinate origin O of the third right-handed three-dimensional Cartesian coordinate system OXYZ is 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, and 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 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 is at the negative value of the OX axis of the third right-handed three-dimensional Cartesian coordinate system OXYZ. a basic cross section determination module 300 for determining a basic cross section of the reflector on 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, wherein the basic cross section is a basic parabola, a focal length of the basic parabola is a focal length P, a focus of the basic parabola is the position point T, and the basic 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 equation of the paraboloid in the form of 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 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 equation of the paraboloid in the form of 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 on a coordinate plane, the second cross section being an arc, the radius of the arc being a 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 the form of an equation of the paraboloid 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 basic 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.

[0102] For the problem of measuring the liquid level of a standing tank using a parabolic focusing external measurement type liquid level gauge for a steering gear, since the liquid level to be measured 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 converted to three-dimensional right-handed polar coordinate system form by ordinary coordinate transformations.

[0105] The present invention determines the reflector using parabolic function calculation in a reduced application range 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 figures, reduce the amount of design calculation work, shorten the design time, improve production efficiency, effectively achieve the purpose of measuring the liquid level of a standing tank from the side wall with an external measurement type liquid level gauge, is more practical, and can be more easily and widely used.

[0106] Each embodiment in this specification is described step by step, and the main purpose of each embodiment is to describe the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Specific examples are used in this specification to explain the principles and embodiments of the present invention. The description of the above embodiments only contributes to understanding the method and core idea of ​​the present invention. At the same time, those skilled in the art may change the form and application scope of the invention according to the idea of ​​the present invention. In summary, the contents of this specification should not be understood as limitations on the present invention.

Claims

1. 1. A method for determining the shape of a reflector by calculation, the method being used to determine a reflector, the reflector being used to reflect an ultrasonic signal emitted by an ultrasonic emission source, the method comprising: determining a reference line segment, one end point of which is a position point T, the length of which is equal to a focal length P of the reflector, the position point T being the position of the ultrasonic wave emission source, and the focal length P being set to be equal to or less than the radius of the standing tank to be measured; 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 O X Y Z, wherein the location 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 T, and the coordinate origin O of the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ 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 at the positive value of the TXP coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ 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, 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, wherein 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 point on the coordinate plane 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 determining a first cross section of the reflector in a coordinate plane, wherein 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 determining a second cross section of the reflector in the TXPZP coordinate plane, the second cross section being an arc, the radius of the arc being the focal length P, and the center of the arc being the location point T; 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 paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ, wherein 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 basic cross section, the first cross section, the second cross section, and the third cross section, wherein a characteristic 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 base parabola in the coordinate plane is x １ ２ =2P ｙ１ where x1 is O １ X １ Y １ X coordinate plane １ Coordinate, y １ Is O １ X １ Y １ Y 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 is of the form １ ２ +z １ ２ =2P ｙ１ 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 y 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, and 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 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 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, and y ｐ is the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ TY Ｐ is a coordinate on the coordinate axis, and z ｐ is the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ TZ Ｐ are coordinates on the coordinate axes, The equation of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ is of the form (x + P) ２ +z ２ =2P ｙ +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 xp ２ = 2 Py ｐ +P ２ and In the first cross section, the ultrasonic wave 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 input to ｐ / x ｐ ), where x ｐ is the projection point (x ｐ , y ｐ ) TX ｐ is the coordinate value, and y ｐ is the projection point (x ｐ , y ｐ ) and the pitch angle range is determined by the ultrasonic signal emitted by the ultrasonic emission source. 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 wave 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 ｐ , z ｐ The horizontal angle of incidence is θ = art(z ｐ / x ｐ ), where x ｐ is the ultrasonic signal emitted from the position point T to the projection point (x ｐ , z ｐ ) TX incident on ｐ is the coordinate value, and z ｐ is the ultrasonic signal emitted from the position point T to the projection point (x ｐ , z ｐ ) and the horizontal angle range is the range of radiation angles of the ultrasonic signal emitted by the ultrasonic emission source on the TXPZP coordinate plane; The equation of the second parabola is z ２ =2P ｙ 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 3, characterized in that the pitch angle range and the horizontal angle range are all determined according to actual conditions and work needs, and there is no ultrasonic signal propagation blocking structure between the parabolic reflector and the liquid surface of the measured standing tank.

5. moreover, 2. The method for determining a reflector according to claim 1, characterized in that, 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.

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 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 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 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 O X Y Z, where the location 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 T, and the coordinate origin O of the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ 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 at the positive value of the TXP coordinate axis of the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ 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, 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, wherein 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 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, wherein 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 a second cross section determining module for determining a second cross section of the reflector in the TXPZP coordinate plane of the reflector; the second cross section being an arc, the radius of the arc being the focal length P, and the center of the arc being the position 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 an equation form of the paraboloid in the third right-handed three-dimensional Cartesian coordinate system OXYZ, wherein 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 basic cross section, the first cross section, the second cross section, and the third cross section, wherein a characteristic 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, wherein the reflector is used to reflect an ultrasonic signal emitted by an ultrasonic emission source, the reflector is a parabolic reflector, a characteristic point of the parabolic reflector is the coordinate origin O, a focus of the parabolic reflector is the position point T, a focal length of the parabolic reflector is the focal length P, and the focal length P is set to be equal to or less than the radius of the standing tank to be measured; The coordinates of the characteristic points of the reflector in the third right-handed three-dimensional Cartesian coordinate system OXYZ are the coordinate origin O(0,0,0), and the coordinates of the characteristic points of the reflector in the second right-handed three-dimensional Cartesian coordinate system TX Ｐ Y Ｐ Z Ｐ The coordinates of the feature point of the reflector in the first right-handed three-dimensional Cartesian coordinate system O are (P, 0, 0). １ X １ Y １ Z １ The coordinates of the characteristic 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 , 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 forms a data table (x, y, z) of the paraboloid, and is used to manufacture a paraboloid-type reflector based on the data table (x, y, z) of the paraboloid.

8. A standing tank external measurement liquid level gauge, comprising: a liquid level determination module; an ultrasonic signal source positioner; and a reflector according to 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 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 is composed of an external measurement type liquid level gauge, which 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 part, the support part being used to install the reflector inside the standing tank to be measured.

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

11. The support part further includes at least three pipe-shaped support columns, each of which has an adjustable length, and which are a first support column, a second support column, and a third support column, and which are connected and fixed to each other via a lateral connecting rod between the first support column, the second support column, and the third support 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 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, and the highest point (X 1 ) of the reflector on the OXY coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ is Ｎ , Y Ｎ , 0) is the semicircular groove N, the semicircular groove M is on the symmetrical center line of the work table, and the coordinates of the semicircular groove M in the third right-handed three-dimensional Cartesian coordinate system OXYZ are (X Ｎ , 0, 0), 11. The standing tank external measurement type liquid level gauge according to claim 10, wherein, 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. 10. The standing tank external measurement type liquid level gauge according to claim 9, wherein 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 used to install the standing tank external measurement type liquid level gauge according to claim 8, determining a selected area, the selected area including a spatial area between the sonic signal source and the reflector and a spatial area between the reflector and the liquid surface directly above the reflector, wherein the standing tank to be measured does not have a structure that blocks sonic wave propagation within the selected area; Within the selected area, using an ultrasonic signal source positioner to determine the position of an ultrasonic emission source on the inner wall of the standing tank to be measured; The focal length P is set to be equal to or less than the radius of the standing tank to be measured, and the arrangement point of the characteristic point of the reflector is determined according to the position of the ultrasonic wave emission source and the focal length P; and installing the reflector according to the placement point, thereby overlapping a feature 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 area, determining the position of the ultrasonic signal source on the inner wall of the standing tank to be measured using an ultrasonic signal source positioner specifically includes: The ultrasonic wave emitting probe is installed in a target area on 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; According to the ultrasound intensity indicator, adjust the positions of the ultrasound emitting probe and the ultrasound receiving probe 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 ultrasound 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 position 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, the end face of the magnetic attraction end is perpendicular to the axial direction of the focal length scale, and the arrangement point of the characteristic point of the reflector is determined according to the position point of the ultrasonic emission source and the focal length P, specifically, Fixing the magnetically attracted end of the focal length scale to the position point of the ultrasonic emission source by magnetic force; 15. The installation method of claim 14, further comprising: adjusting the position of the reflector, inserting the sharp tip of the focal length scale into the small hole of the reflector characteristic point O, and further positioning the reflector characteristic point at the placement point.

16. Specifically, the placement of the reflector in accordance with the placement point includes: Installing a reflector on a support in accordance with 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, adjusting the pitch angle and horizontal angle of the reflector to make 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, is as follows: a copper wire is hung in the semicircular groove N of the reflector, and the copper on the copper wire is allowed to hang freely; and a pitch angle of the reflector in the TXY coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ and a horizontal angle of the reflector in the TXZ coordinate plane of the third right-handed three-dimensional Cartesian coordinate system OXYZ are adjusted so that the copper wire is placed in the semicircular groove M, but the copper wire does not come into contact with the 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 characteristic points 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 installation method according to claim 16, wherein the ordinate is 0, 0).

18. Specifically, adjusting the pitch angle and horizontal angle of the reflector to make 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, is as follows:

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 so that the laser emitted from the laser ranging calibrator is incident on a characteristic point of the reflector; and the distance displayed by the laser ranging calibrator is equal to the focal length P; setting 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 on the support part.

19. Specifically, adjusting the position and shape of the reflector by 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 after being reflected by the reflector, being focused at a position close to the ultrasonic emission source, 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 at a position close to the ultrasonic emission source, so as to make the graphic signal close to the ultrasonic emission source as small a circular graphic as possible.

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