Non-contact tension ring size measuring device and method

Abstract

The invention relates to the technical field of petrochemical instrument measurement, in particular to a non-contact tension ring size measuring device and method, and the device comprises a camera obscura, a light source, a slit, a sliding rail with scales, a vertical horizontal hanging rod, an adjustable hanging line, a horizontal movable tension ring clamp and a movable coordinate paper clamp, a projection of the tension ring is formed on the coordinate paper. The actual diameter of the tension ring is obtained through the similar triangle relation; and evaluating the roundness through the multi-axial projection diameter difference. The device is simple in structure, low in cost and accurate in measurement, and can replace an expensive imager to be used for non-contact measurement of the outer diameter of the platinum ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petrochemical instrument measurement, in particular to a non-contact tension ring size measurement device and method. BACKGROUND

[0002] The size of the tension value can reflect the physical and chemical properties of the liquid and its material composition, and is one of the important indicators for investigating product quality in many material and engineering fields. The most widely used tension measuring instrument is an interfacial tension meter, which is composed of a tension measuring device, a test bench, a controllable moving device, and a tension ring (platinum ring) or a platinum plate. The instrument is widely used in power, petroleum, chemical, and other industries. In particular, the platinum ring method is widely used. The measurement principle is to place the tension measuring device connected to the platinum ring at zero, then gently immerse it in the liquid, then slowly lift the platinum ring upwards, so that the liquid surface relatively drops and finally separates from the platinum ring. The highest value measured during this process is the surface tension value. As can be seen, the platinum ring is a very important component. It is made of high-purity platinum wire, and there are strict requirements for the diameter of the platinum wire and the circumference size of the platinum ring. Therefore, it is necessary to measure the diameter of the platinum wire and the outer diameter of the platinum ring. The outer diameter of the platinum ring is usually measured using a non-contact method, such as using an image instrument for measurement, but the image instrument is very expensive.

[0003] Therefore, it is urgent to develop a non-contact tension ring size measurement device and method to solve the above problems. SUMMARY

[0004] The present application provides a non-contact tension ring size measurement device and method to overcome the shortcomings of the prior art.

[0005] A non-contact tension ring size measurement device, comprising at least one of a vertical structure or a horizontal structure, characterized in that: The vertical structure comprises a vertical dark box, a light source and a slit are arranged on the top of the dark box, a slide rail is vertically arranged on one side of the inside of the dark box, a horizontal hanging rod is arranged on one side above the slide rail, the tension ring is suspended by an adjustable hanging line at the bottom of the horizontal hanging rod, a movable position indicating clamp aligned with the tension ring is arranged on the slide rail, and a coordinate paper is arranged on the inside base of the dark box. The horizontal structure comprises a horizontally placed dark box, a light source and a slit are arranged on one side of the dark box, a slide rail is arranged on the inside bottom of the dark box, a movable tension ring clamp and a movable coordinate paper clamp are slidably connected on the slide rail, the tension ring is clamped on the movable tension ring clamp, and the coordinate paper is clamped on the movable coordinate paper clamp.

[0006] Further, in order to better implement the present application, a scale is arranged on the side edge of the slide rail; and the slit diameter of the light source and the slit is 5-10mm.

[0007] A measurement method of a vertical structure non-contact tension ring size measuring device, comprising the following steps: S1, the tension ring and the measuring device are isothermal in a constant temperature room at 20 DEG C for more than 4h; S2, the light source is turned on, and the coordinate paper is fixed in the center of the base; S3, the adjustable hanging line is put on the tension ring, and the tension ring is hung on the horizontal hanging rod, the length of the adjustable hanging line is adjusted to make the tension ring at a proper height, and the specific height is determined by the projection clarity and the projection diameter size of the tension ring on the coordinate paper; the tension ring is stabilized to be vertical and stationary; S4, the movable position indicating clamp on the slide rail support is adjusted to be on the same horizontal line with the lowermost ring of the tension ring; S5, the position height h of the movable position indicating clamp on the slide rail support is read, and the height of the light source to the coordinate paper on the base is a fixed value H; S6, according to the projection on the coordinate paper, the projection diameters D of the tension ring in different axial directions are read, and the circumferences are marked on the coordinate paper by a pen; S7, the diameters in different axial directions are read according to the marked circumferences, and the roundness of the tension ring is simply judged by the diameters in different axial directions; S8, according to the principle of similar triangles, the diameter d of the tension ring is calculated, and the calculation formula is: d is calculated by D in different axial directions, and the average value is taken; S9, in order to ensure the measurement accuracy, the height h2 of the tension ring is adjusted again according to S3, a new projection diameter D2 is obtained, and steps 3-8 are repeated to obtain d2; S10, the d i of the tension ring at different heights is calculated, and the average value is the actual diameter d of the tension ring.

[0008] A measurement method of a horizontal structure non-contact tension ring size measuring device, comprising the following steps: S1, the tension ring and the measuring device are isothermal in a constant temperature room at 20 DEG C for more than 4h; S2, the light source is turned on, and the coordinate paper is fixed in the center of the base; S3, the tension ring metal rod is clamped on the movable tension ring clamp at an angle parallel to the light path, and the position of the movable tension ring clamp on the slide rail is adjusted to make the tension ring at a proper position, and the specific position is determined by the projection clarity and the projection diameter size of the tension ring on the coordinate paper; S4, the position l of the movable tension ring clamp is read, and the length of the light source to the coordinate paper is L; S5, according to the projection on the coordinate paper, the projection diameter D of the tension ring is read, and the circumference is marked on the coordinate paper by a pen; S6, read the diameters of different axial directions according to the marked circumference, and determine the roundness of the tension ring according to the diameters of different axial directions; S7, calculate the diameter d of the tension ring according to the principle of similar triangles, and the calculation formula is: ; calculate d through the diameters of different axial directions D, and take the average value; S8, in order to ensure the measurement accuracy, the distance between the tension ring and the light source can be adjusted again according to S3 l 2 , and a new projection diameter is obtained D 2, repeat steps 3-7 to obtain d 2; S9, calculate the average value of d of the tension ring at different heights i , and the average value is the actual diameter d of the tension ring.

[0009] The beneficial effects of the present application are: The present application can determine the roundness, and can accurately measure the diameter of the tension ring through a non-contact method. The measuring device has a simple structure and a clear principle, and avoids the high investment of expensive instruments such as image meters. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a schematic view of a vertical structure of the non-contact tension ring size measuring device of the present application; Figure 2 is a schematic view of a horizontal structure of the non-contact tension ring size measuring device of the present application; Figure 3 is a schematic view of the reading geometry of the vertical structure of the non-contact tension ring size measuring device of the present application; Figure 4 is a schematic view of the reading geometry of the horizontal structure of the non-contact tension ring size measuring device of the present application.

[0011] In the figure, 1, dark box, 2, horizontal hanging rod, 3, adjustable hanging line, 4, coordinate paper, 5, base, 6, movable position indicating clamp, 7, sliding rail, 8, light source and slit, 9, movable tension ring clamp, 10, movable coordinate paper clamp. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0013] The following detailed description of embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but merely represents selected embodiments of the application. Based upon the embodiments of the application, all other embodiments that would be obtained by one skilled in the art without having to make inventive efforts are within the scope of the application.

[0014] Figure 1 Figure 3 For the first embodiment of the application, the embodiment is a measurement method of a vertical structure non-contact tension ring size measurement device: 1. The tension ring and the measurement device are equilibrated at 20°C for 4 hours or more.

[0015] 2. Turn on the light source and fix the coordinate paper in the center of the base.

[0016] 3. Put the adjustable hanging line on the tension ring and hang it on the horizontal hook. Adjust the length of the adjustable hanging line to make the tension ring at an appropriate height, which is determined by the clarity of the tension ring projection on the coordinate paper and the projection diameter size. Stabilize the tension ring to make it vertical and stationary.

[0017] 4. Adjust the movable position indicating clamp on the slide rail bracket to be at the same horizontal line as the lowermost ring of the tension ring.

[0018] 5. Read the position height of the movable position indicating clamp on the slide rail bracket h is 123 mm. The height of the light source to the coordinate paper on the base is a fixed value H of 394 mm.

[0019] 6. According to the projection on the coordinate paper, read the projection diameters of the different axial tension rings as 63 mm, 62 mm, 63 mm, and 62.5 mm, and mark the circumference on the coordinate paper with a pen.

[0020] 7. According to the marked circumference, read the diameters of different axial directions, and simply judge the roundness of the tension ring by the diameters of different axial directions. The maximum diameter is 63 mm, the minimum diameter is 62 mm, and the roundness error is 1 mm.

[0021] 8. According to the principle of similar triangles, calculate the diameter of the tension ring d . The calculation formula is: . Calculate the diameter of the tension ring through the diameters of different axial directions D , which are 19.668 mm, 19.355 mm, 19.668 mm, and 19.511 mm, respectively, and take the average value d of 19.551 mm. d

[0022] 9. To ensure accurate measurement, the height of the tension ring can be adjusted again according to step 3.​h 2 is 169 mm, the new projection diameter average value is obtained D 2 is 45 mm, steps 3~8 are repeated to obtain d 2 is 19.731 mm.

[0023] 10. The tension ring is at different heights d i , the average value is calculated, which is the actual diameter of the tension ring d is 19.641 mm.

[0024] 11. The actual diameter of the tension ring is verified by image measurement d is 19.738 mm. The measurement device has a measurement error of -0.097 mm compared with the image measurement device.

[0025] The second specific embodiment of the vertical structure is: 1. The tension ring and the measurement device are equilibrated in a constant temperature room at 20°C for more than 4 hours.

[0026] 2. Turn on the light source and fix the coordinate paper in the center of the base.

[0027] 3. Put the adjustable hanging line on the tension ring and hang it on the horizontal hook. Adjust the length of the adjustable hanging line to make the tension ring at an appropriate height, which is determined by the projection clarity and projection diameter size of the tension ring on the coordinate paper. Stabilize the tension ring to make it vertical and stationary.

[0028] 4. Adjust the movable position indicating clamp on the slide rail support to be at the same horizontal line with the lowermost ring of the tension ring.

[0029] 5. Read the position height of the movable position indicating clamp on the slide rail support h is 212 mm. The height of the light source to the coordinate paper on the base is a fixed value H is 394 mm.

[0030] 6. According to the projection on the coordinate paper, read the projection diameters of the tension ring in different axial directions as 36.5 mm, 37 mm, 36 mm and 37 mm respectively, and mark the circumference on the coordinate paper with a pen.

[0031] 7. According to the marked circumference, read the diameters in different axial directions, and simply judge the roundness of the tension ring by the diameters in different axial directions. The maximum diameter is 37.5 mm, the minimum diameter is 36 mm, and the roundness error is 1.5 mm.

[0032] 8. According to the principle of similar triangles, calculate the diameter of the tension ring d . The calculation formula is: . The diameter in different axial directions D is calculated d, respectively, 19.640 mm, 19.909 mm, 19.371 mm, 19.909 mm, and take the average value d is 19.707 mm.

[0033] 9. To ensure the measurement accuracy, the height of the tension ring can be adjusted again according to step 3 h 2 is 118 mm, and a new average projection diameter is obtained D 2 is 65.6 mm, and steps 3-8 are repeated to obtain d 2 is 19.647 mm.

[0034] 10. The actual diameter of the tension ring at different heights of the tension ring d i , and the average value is the actual diameter of the tension ring d is 19.677 mm.

[0035] 11. The actual diameter of the tension ring is verified by image measurement d is 19.738 mm. The measurement error of the measuring device and the image measurement is -0.061 mm.

[0036] Figure 2 Figure 4 The third embodiment of the present application is a measurement method of a vertical structure non-contact tension ring size measuring device: 1. The tension ring and the measuring device are equilibrated at 20°C in a constant temperature room for more than 4 hours.

[0037] 2. Turn on the light source, and fix the coordinate paper in the center of the movable coordinate paper clamp.

[0038] 3. The tension ring metal rod is clamped on the movable tension ring clamp at an angle parallel to the light path, and the position of the movable tension ring clamp is adjusted on the slide rail to make the tension ring in a suitable position, and the specific position is determined by the projection clarity and projection diameter of the tension ring on the coordinate paper.

[0039] 4. Read the position of the movable tension ring clamp l is 203 mm. The length from the light source to the coordinate paper L is 400 mm.

[0040] 5. According to the projection on the coordinate paper, read the projection diameter of the tension ring D Make a circumference mark on the coordinate paper with a pen.

[0041] 6. According to the marked circumference, read the diameters in different axial directions, which are 39 mm, 38.5 mm, 38.5 mm, and 39 mm, respectively. The roundness of the tension ring is judged by the diameters in different axial directions, the maximum value is 39 mm, the minimum value is 38.5 mm, and the roundness error is 0.5 mm.

[0042] 7. According to the principle of similar triangle, the diameter of tension ring is calculated d , the principle is as follows. The calculation formula is: . The diameters of tension ring at different axial positions are calculated D d respectively: 19.793 mm, 19.539 mm, 19.539 mm, 19.793 mm, and the average value is 19.666 mm.

[0043] 8. To ensure the measurement accuracy, the distance between tension ring and light source is adjusted again according to the steps l 2 is 165 mm, and the average value of new projection diameter is D 2 is 47.9 mm, and the steps 3~7 are repeated to obtain d 2 is 19.759 mm.

[0044] 9. The diameters of tension ring at different positions are calculated d i , and the average value is the actual diameter of tension ring d is 19.712 mm.

[0045] 10. The actual diameter of tension ring is verified by image measuring instrument d is 19.738 mm. The measurement error of measuring device and image measuring instrument is -0.026 mm.

[0046] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application but not to limit the present application, and other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of claims of the present application as long as they do not deviate from the spirit and scope of the present application.​

Claims

1. A non-contact tension ring size measuring device, comprising at least one of a vertical structure or a horizontal structure, characterized in that: the vertical structure comprises a vertical dark box (1), a light source and a slit (8) are arranged on the top of the dark box (1), a slide rail (7) is vertically arranged on one side of the inside of the dark box (1), a horizontal hanging rod (2) is arranged on one side above the slide rail (7), a tension ring is hung by an adjustable hanging line (3) at the bottom of the horizontal hanging rod (2), a movable position indicating clamp (6) is arranged on the slide rail (7) to align the tension ring, and a coordinate paper (4) is arranged on the inside base (5) of the dark box (1); the horizontal structure comprises a horizontal dark box (1), a light source and a slit (8) are arranged on one side of the dark box (1), a slide rail (7) is arranged on the inside bottom of the dark box (1), a movable tension ring clamp (9) and a movable coordinate paper clamp (10) are slidably connected on the slide rail (7), the tension ring is clamped on the movable tension ring clamp (9), and the coordinate paper (4) is clamped on the movable coordinate paper clamp (10).

2. The non-contact tension ring size measuring device according to claim 1, characterized in that: a scale is arranged on the side edge of the slide rail (7); and the slit diameter of the light source and the slit (8) is 5-10 mm.

3. A measurement method of a non-contact tension ring size measuring device of a vertical structure based on the non-contact tension ring size measuring device according to claim 1, characterized by, including the following steps: S1, equilibrate the tension ring and the measuring device in a constant temperature room at 20℃ for more than 4 hours; S2, turn on the light source, and fix the coordinate paper in the center of the base; S3, wrap the adjustable hanging line around the tension ring, hang it on the horizontal hanging rod, adjust the length of the adjustable hanging line to make the tension ring at a proper height, and the specific height is determined by the projection clarity and the projection diameter size of the tension ring on the coordinate paper; stabilize the tension ring to make it vertical and stationary; S4, adjust the movable position indicating clamp on the slide rail support to make it on the same horizontal line with the lowermost ring of the tension ring; S5, read the position height h of the movable position indicating clamp on the slide rail support.

4. The height from the light source to the coordinate paper on the base is a fixed value H; S6, read the projection diameters D of the tension ring in different axial directions according to the projection on the coordinate paper, and mark the circumference on the coordinate paper with a pen; S7, read the diameters in different axial directions according to the marked circumference, and judge the roundness of the tension ring by the diameters in different axial directions; S8, according to the principle of similar triangles, the tension ring diameter d is calculated, the calculation formula is: ; d is calculated by different axial D, and the average value is taken; S9, to ensure the measurement accuracy, the height h2 of the tension ring can be adjusted again according to S3, a new projection diameter D2 is obtained, and steps 3-8 are repeated to obtain d2; S10, d at different heights of the tension ring i The average value is the actual diameter d of the tension ring.

5. A measurement method of a non-contact tension ring size measuring device of a horizontal structure, based on the non-contact tension ring size measuring device according to claim 1, characterized by, including the following steps: S1, equilibrate the tension ring and the measuring device in a constant temperature room at 20℃ for more than 4 hours; S2, turn on the light source, and fix the coordinate paper in the center of the movable coordinate paper clamp; S3, clamp the metal rod of the tension ring on the movable tension ring clamp at an angle parallel to the light path, adjust the position of the movable tension ring clamp on the slide rail to make the tension ring at a proper position, and the specific position is determined by the projection clarity and the projection diameter size of the tension ring on the coordinate paper; S4, read movable tension ring clamp position l the length of the light source to the coordinate paper is L; S5, read the projection diameter D of the tension ring according to the projection on the coordinate paper, and mark the circumference on the coordinate paper with a pen; S6, read the diameters in different axial directions according to the marked circumference, and judge the roundness of the tension ring by the diameters in different axial directions; S7, according to the principle of similar triangles, the tension ring diameter d is calculated, the calculation formula is: ; d is calculated by D for different axes and averaged; S8, to ensure the accuracy of the measurement, the distance between the tension ring and the light source can be adjusted again according to S3 l 2 to obtain a new projection diameter D 2, repeating steps 3~7 to obtain d 2; S9, d at different heights of the tension ring i The average value is the actual diameter d of the tension ring.

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