An ellipticity measuring scale

Abstract

The utility model discloses an ovality measuring scale belongs to the technical field of measuring tool, aims at solving the problem of " professional equipment is inconvenient, simple tool precision is low " of the ovality measuring tool of existing, and this measuring scale core structure includes square tube, stand, sleeve pipe and pressure spring, sleeve pipe is fixed in square tube and the axis is perpendicular with square tube length direction, and stand is freely movable in the sleeve pipe, and pressure spring is sleeved in the stand and is located in the sleeve pipe, and the stand is closely contacted with the measured circular ring through the elastic force. Its measuring principle is to utilize " the circle inside cutting line principle " and " three points form a circle " characteristics, and the two end points of square tube and the contact point of stand and circular ring constitute the measuring three points, and through monitoring the position change of stand, the diameter deviation of different cross sections of circular ring is reflected, and then the ovality change is confirmed. The utility model has the advantages of simple structure, low cost, strong portability, and the operation can be completed in 1 minute by a single person without complex calibration.

Description

Technical Field

[0001] This utility model relates to the field of industrial measuring tools, and more specifically to an ellipticity measuring ruler. Background Technology

[0002] In fields such as machinery manufacturing, petrochemicals, and pipeline installation, it is frequently necessary to measure the roundness or ellipticity of rings, flanges, pipes, etc., to ensure their installation accuracy and performance. Currently, ellipticity measuring tools are mainly divided into two categories: one is professional ellipticity measuring instruments, which have high measurement accuracy, but the equipment is large, heavy, and expensive, and requires an external power supply or complex calibration procedures, making it inconvenient to carry to the construction site or workshop production line for rapid testing; the other is simple measuring tools (such as vernier calipers with rulers, tape measures, etc.), which are low in cost and portable, but require multiple measurements of diameter at different locations and manual calculation of deviations, making operation cumbersome and dependent on operator experience. Inaccurate positioning and uneven force can easily lead to large measurement errors, making it difficult to meet the needs of high-precision measurement.

[0003] Therefore, there is an urgent need for a dedicated measuring tool that is simple in structure, easy to operate, and can quickly and intuitively reflect changes in the ellipticity of a ring. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing ellipticity measuring tools by providing an ellipticity measuring ruler that is simple in structure, easy to use, and fast in measurement. It utilizes the principle of secant in a circle to quickly confirm the ellipticity change of a ring by forming a circle from three points.

[0005] The technical solution adopted by this utility model is as follows: an ellipticity measuring ruler, including a square tube, a vertical rod, a sleeve, and a pressure spring; the sleeve is fixedly installed on the square tube, and the axis of the sleeve is perpendicular to the length direction of the square tube; the vertical rod passes through the sleeve, and the pressure spring is sleeved on the vertical rod. Preferably, the upright is provided with a size scale. Preferably, the upright is provided with a limiting part to prevent the upright from coming out of the sleeve.

[0006] Preferably, the square tube has a through hole, and the center of the through hole coincides with the center of the sleeve. Preferably, the pressure spring acts on the upright to apply an elastic force to the upright. Preferably, the sleeve is fixedly connected to the square tube, and the perpendicularity of the sleeve to the square tube meets the requirements. Preferably, the square tube is configured to cooperate with the upright, and the upright passes through the sleeve. Preferably, the dimensions of the pole are affixed as a sticker with graduations, and the graduations are distributed along the length of the pole. Preferably, the ring is detachable and is used in conjunction with the upright. Preferably, the position of the square tube is adjusted, and the elliptic variation of the ring is determined by the change in size from the center of the upright to the edge of the ring.

[0007] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. Simple structure and low cost: This utility model consists of only a few parts such as square tube, upright, sleeve and spring, with compact structure and low manufacturing and maintenance costs.

[0008] 2. Convenient operation and fast measurement: When in use, simply place both ends of the square tube against the inner wall of the ring to be measured. The upright rod will automatically press against the inner wall of the top of the ring under the action of the spring. By directly reading the scale value on the upright rod or comparing the scale difference at different positions, the ellipticity can be quickly determined, which greatly improves the detection efficiency.

[0009] 3. Scientific Principle, Intuitive Results: It cleverly utilizes the geometric principle that "three points not on the same straight line determine a circle." The two ends of the square tube form two fixed points, and the top of the spring-supported upright forms a third point. The displacement of this third point relative to the reference circle directly reflects the change in the ellipticity of the ring, providing a clear and intuitive result.

[0010] 4. High applicability: By changing the square tube of different lengths, it can be used to measure rings of various diameters, and has good versatility. Attached Figure Description

[0011] This utility model will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partially enlarged structural diagram of the upright pole of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the sleeve of this utility model; Figure 4 This is a partially enlarged structural schematic diagram of the square tube of this utility model; Figure 5 This is a schematic diagram of the working principle of this utility model (measuring the state of the standard circular ring); Figure 6 This is a schematic diagram illustrating the working principle of this utility model (measuring the state of the elliptical ring). The markings in the diagram are: 1-square tube, 11-through hole, 2-upright rod, 21-circular ring, 22-dimension sticker, 3-sleeve, 4-compression spring. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0013] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0014] In one embodiment of this utility model, such as Figure 1-4 As shown, this embodiment provides an ellipticity measuring ruler, including a square tube 1, a vertical rod 2, a sleeve 3, and a pressure spring 4; the sleeve 3 is fixedly mounted on the square tube 1, and the axis of the sleeve 3 is perpendicular to the length direction of the square tube 1; the vertical rod 2 passes through the sleeve 3, and the pressure spring 4 is sleeved on the vertical rod 2 and located inside the sleeve 3, so as to use the principle of secant in a circle and the method of three points forming a circle to confirm the ellipticity change of the ring 21.

[0015] More specifically, this utility model provides an ellipticity measuring ruler, including a square tube 1, a vertical rod 2, a sleeve 3, and a pressure spring 4. The square tube 1 is a long strip of metal tube, serving as the reference beam of the measuring ruler, and its length is determined according to the nominal diameter of the ring to be measured. A through hole 11 is provided on the square tube 1. The sleeve 3 is a circular tube, which is vertically fixed to the center of the upper surface of the square tube 1 by welding. During welding, it is necessary to ensure the perpendicularity of the sleeve 3 to the square tube 1, which is crucial to ensuring measurement accuracy. The center of the through hole 11 coincides with the center of the inner hole of the sleeve 3. The vertical rod 2 is a cylindrical rod that passes through the sleeve 3 and can slide along the axial direction (vertical direction) of the sleeve 3. A ring 21 is fitted on the vertical rod 2, which can be fixed to the vertical rod 2 by means of threaded connection, buckle, or pin, forming a detachable limiting structure to prevent the vertical rod 2 from completely detaching from the sleeve 3. A dimension sticker 22 is affixed to the surface of the upright rod 2. This sticker has precise graduations distributed along the length of the upright rod 2, indicating the numerical value of the extended length of the upright rod 2. The pressure spring 4 is sleeved on the upright rod 2 and housed inside the sleeve 3. The upper end of the pressure spring 4 abuts against a step or another fixing ring (not shown separately in the figure) on the inner side of the top of the sleeve 3, and the lower end abuts against the ring 21 of the upright rod 2. Under the elastic force of the pressure spring 4, the upright rod 2 is always subjected to a downward thrust, causing its bottom to tend to always be in close contact with the inner wall of the workpiece being measured.

[0016] In another embodiment of this utility model, the upright 2 is provided with a size sticker 22 for marking size scale.

[0017] In another embodiment of the present invention, a ring 21 is fitted on the upright 2, and the ring 21 is used to restrict the upright 2 from coming out of the square tube 1.

[0018] In another embodiment of the present invention, a through hole 11 is provided on the square tube 1, and the center of the through hole 11 coincides with the center of the opening of the sleeve 3.

[0019] In another embodiment of this utility model, one end of the pressure spring 4 abuts against the ring 21 at the top of the sleeve 3, and the other end abuts against the ring 21 on the upright 2 to apply an elastic force to the upright 2.

[0020] In another embodiment of this utility model, the sleeve 3 and the square tube 1 are fixedly connected by welding, and the perpendicularity of the sleeve 3 and the square tube 1 after welding meets the preset requirements.

[0021] In another embodiment of this utility model, the square tube 1 is long and extends horizontally, and the upright 2 is inserted vertically into the sleeve 3.

[0022] In another embodiment of this utility model, the size sticker 22 is a sticker with scales, and the scales are distributed along the length direction of the pole 2.

[0023] In another embodiment of this utility model, the ring 21 is a detachable structure, which facilitates the replacement or maintenance of the upright 2.

[0024] In another embodiment of this utility model, the elliptic change of the ring 21 is confirmed by moving the square tube 1 and observing the dimensional change from the center of the upright 2 to the edge of the ring 21.

[0025] The working principle of this utility model is as follows: During measurement, the square tube 1 is placed horizontally inside the ring to be measured, so that the two ends of the square tube 1 contact the inner wall of the ring, forming two fixed contact points (e.g., ...). Figure 5 Points A and B in the diagram). Under the action of the pressure spring 4, the upright rod 2 extends downward, and its bottom end tightly abuts against the inner wall of the top of the ring, forming a third contact point (e.g., points A and B in the diagram). Figure 3 Point C in the diagram). At this time, read the scale value on the upright 2 relative to the upper surface of the square tube 1 (or the top of the sleeve 3). This value is the chord height (H) of the current measurement position.

[0026] For a perfectly circular ring, regardless of how the measuring scale is rotated, its chord height (H) should remain unchanged (e.g., ...). Figure 5 (As shown). If the ring has ellipticity, when the measuring ruler is placed along the major axis of the ellipse, the upright 2 will be pressed deeper into the sleeve 3, and the chord height reading (H1) will decrease; when the measuring ruler is placed along the minor axis of the ellipse, the length of the upright 2 extending out will increase, and the chord height reading (H2) will increase (as shown). Figure 6 (As shown). By moving the measuring ruler multiple times in different directions to take measurements, the change in the scale value on the upright 2 (ΔH=|H1-H2|) is observed and recorded. This change directly reflects the change in the ellipticity of the ring, thus allowing for a quick and intuitive judgment of whether the workpiece is qualified.

[0027] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An ellipticity gauge characterized in that, It includes a square tube (1), a vertical pole (2), a sleeve (3), and a pressure spring (4); the sleeve (3) is fixedly installed on the square tube (1), and the axis of the sleeve (3) is perpendicular to the length direction of the square tube (1); the vertical pole (2) passes through the sleeve (3), and the pressure spring (4) is sleeved on the vertical pole (2).

2. The ellipticity measuring ruler according to claim 1, characterized in that, The upright (2) is provided with size scale.

3. An ellipticity measuring ruler according to claim 1, characterized in that, The upright (2) is provided with a limiting part to prevent the upright (2) from coming out of the sleeve (3).

4. An ellipticity measuring ruler according to claim 1, characterized in that, The square tube (1) is provided with a through hole (11), and the center of the through hole (11) coincides with the center of the sleeve (3).

5. An ellipticity measuring ruler according to claim 1, characterized in that, The pressure spring (4) acts on the upright (2) to apply an elastic force to the upright (2).

6. An ellipticity measuring ruler according to claim 1, characterized in that, The sleeve (3) is fixedly connected to the square tube (1), and the perpendicularity of the sleeve (3) and the square tube (1) meets the requirements.

7. An ellipticity measuring ruler according to claim 1, characterized in that, The square tube (1) is configured to cooperate with the upright (2), and the upright (2) is inserted into the sleeve (3).

8. An ellipticity measuring ruler according to claim 2, characterized in that, The size sticker (22) of the pole (2) is a sticker with a scale, and the scale is distributed along the length direction of the pole (2).

9. An ellipticity measuring ruler according to claim 3, characterized in that, A ring (21) is fitted on the upright post. The ring (21) is detachable and is used in conjunction with the upright post (2).

10. An ellipticity measuring ruler according to claim 1, characterized in that, Adjust the position of the square tube (1), and determine the elliptic change of the ring by the change in size from the center of the upright (2) to the edge of the ring.

Images