A ruler for measuring the arc of inner circle

Abstract

The utility model discloses a ruler for measuring the radian of an inner circular edge, and relates to the technical field of radian measuring tools. The device comprises a connecting rod, wherein the upper end of the connecting rod is provided with a handle assembly which is convenient for holding, and the lower end of the connecting rod is also symmetrically provided with two radian detection assemblies, wherein the detection assembly comprises a scale ruler, a limit sleeve, a reset spring, a telescopic rod and a second pulley, wherein the scale ruler is arranged on the surface of the limit sleeve and is closely arranged in millimeters along the length direction of the limit sleeve, wherein a piston indicating block is slidingly provided inside the limit sleeve, and the lower end of the piston indicating block is connected to the inner bottom of the limit sleeve through a reset spring. The utility model realizes a more convenient and efficient standard detection of the radian of the inner circular edge of a workpiece through the radian detection assembly, and the utility model directly obtains the verification result of whether the radian surface of the inner circular edge is smooth and uniform on carbon paper by using the trajectory of a tracing pen to depict.

Description

Technical Field

[0001] The utility model relates to the technical field of radian measuring tools, in particular to a ruler for measuring the radian of an inner circle edge. Background Art

[0002] Rolling machines are divided into two types: mechanical and hydraulic. Mechanical rolling machines have unique structures, small size, low energy consumption, high efficiency, no noise, easy installation and use, simple operation, strong bearing capacity, long life, fast rolling speed, and reliable product quality. Hydraulic rolling machines are upgraded products of mechanical rolling machines, which can increase the thickness and width of the roll. Rolling machines are also needed when manufacturing wind turbine towers.

[0003] The radian is a unit of measurement for angles, and is defined as an arc whose length is equal to the radius. In the actual product inspection process, it is often necessary to measure the radian of the product. For example, the radian measuring gauge recorded in the patent announcement number CN216432815U uses the movement of the tooth needle to make it fit with the surface of the object to be measured, and obtains the X-axis size and Y-axis size of multiple points to be measured on the surface to be measured through the first scale and the second scale mark, thereby obtaining the radian of the object to be measured. The device cannot directly obtain the radian and the reading process is complicated. There are many data to be calculated, which is prone to errors.

[0004] Generally, a right-angle caliper cannot reasonably locate and measure the size of the arc surface, and the curvature cannot be measured with a conventional right-angle caliper. Based on this, a ruler for measuring the curvature of an inner circular edge is now provided, which can not only perform standard inspection of the curvature of the inner circular edge, but also directly obtain the verification result of whether the inner circular edge arc surface is smooth and uniform. Utility Model Content

[0005] The utility model aims to provide a ruler for measuring the arc of an inner circle to solve the problems in the background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A ruler for measuring the curvature of an inner circular edge comprises a connecting rod, wherein the upper end of the connecting rod is provided with a handle assembly for easy holding, a second support rod is symmetrically provided on both sides of the lower end of the connecting rod, a first pulley is rotatably provided at the lower end of each second support rod, and two curvature detection assemblies are also symmetrically provided at the lower end of the connecting rod.

[0008] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0009] In an optional scheme: the detection component includes a scale, a limit sleeve, a reset spring, a telescopic rod and a No. 2 pulley. The scale is set on the surface of the limit sleeve and is densely arranged in millimeters along the length direction of the limit sleeve. The limit sleeve is fixed on the connecting rod and is made of transparent material. A piston indicator block is slidably provided inside the limit sleeve, a telescopic rod is provided at the lower end of the piston indicator block, a No. 2 pulley is rotatably provided at the lower end of the telescopic rod, and the lower end of the piston indicator block is connected to the bottom of the limit sleeve through a reset spring.

[0010] In an optional solution: the handle assembly includes a hand and a first support rod, and the upper end of the vertically arranged first support rod is connected and fixed to the horizontally arranged handle.

[0011] In an optional scheme: a cylinder is provided on the second support rod on one side of the connecting rod, and the cylinder is rotatably arranged on the outside of the second support rod. A disk is provided at the lower end of the second support rod, and the disk is in friction contact with the surface of the first pulley. Carbon paper is pasted on the surface of the cylinder, and a horizontally arranged writing pen is provided on the side of the telescopic rod close to the carbon paper, and the writing position of the writing pen is in contact with the surface of the carbon paper.

[0012] In an optional solution: the description pen is fixed on the telescopic rod through the description leg, and one end surface of the description pen is provided with a thread and can be screwed and connected with the threaded hole on the end of the description leg.

[0013] In an optional solution: the diameter of the disc is greater than the diameter of the cylinder.

[0014] In an optional solution, the bottoms of the first pulley and the second pulley are on the same horizontal plane, and the diameter of the first pulley is greater than the diameter of the second pulley.

[0015] In an optional solution: the vertical height of the second support rod is greater than the vertical height of the cylinder, and the diameter of the cylinder is greater than the diameter of the second support rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The utility model realizes a more convenient and efficient standard detection of the curvature of the inner edge of the workpiece through the curvature detection component.

[0018] 2. The utility model can directly obtain the verification result of whether the inner circular edge arc surface is smooth and uniform on the carbon paper by using the trajectory of the description pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of one side of the utility model.

[0020] Figure 2 It is a bottom view at a certain angle of the structural schematic diagram of one side of the utility model.

[0021] Figure 3 It is a structural schematic diagram of the other side of the utility model.

[0022] Figure 4 It is a schematic diagram of the unfolding of the carbon paper after recording the arc trajectory information in the utility model.

[0023] Notes on the accompanying drawings: 101, handle; 102, first support rod; 103, connecting rod; 104, second support rod; 105, pulley No. 1; 201, scale ruler; 202, limit sleeve; 203, return spring; 204, telescopic rod; 205, pulley No. 2; 301, carbon paper; 302, cylinder; 303, disk; 304, description pen; 305, description leg. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] Example 1

[0026] In one embodiment, Figure 1-Figure 4 As shown, a radian ruler for measuring inner circular edges comprises a connecting rod 103, wherein the upper end of the connecting rod 103 is provided with a handle assembly for easy hand-holding, the arrangement of the assembly facilitates the taking and placing of the radian ruler, a second support rod 104 is symmetrically arranged on both sides of the lower end of the connecting rod 103, and a No. 1 pulley 105 is rotatably arranged at the lower end of each second support rod 104, and as the wheel rotates, the radian ruler can slide on the radian surface of the inner circular edge of the workpiece, and two radian detection assemblies are symmetrically arranged at the lower end of the connecting rod 103 for recording the data left by the radian ruler when sliding on the radian surface, and the purpose of setting the two detection assemblies is to compare and refer to the data so as to check whether the radian surface has a standard roundness.

[0027] The arc detection component includes: a scale ruler 201, a limit sleeve 202, a return spring 203, a telescopic rod 204 and a second pulley 205. The scale ruler 201 is arranged on the surface of the limit sleeve 202 and is densely arranged in millimeters along the length direction of the limit sleeve 202, so that the data can be more accurate to improve the accuracy of measurement. The limit sleeve 202 is fixedly arranged on the connecting rod 103 and is made of transparent material to facilitate reading and counting. A piston indicating block is slidably provided inside the limit sleeve 202. When it is static in a horizontal position, the indicating scale at the upper end of the piston indicating block is a zero scale line. A telescopic rod 204 is provided at the lower end of the piston indicating block. A second pulley 205 is rotatably provided at the lower end of the telescopic rod 204 to assist the first pulley 105 to realize arc sliding together. The lower end of the piston indicating block is connected to the inner bottom of the limit sleeve 202 through a return spring 203 to realize scale zeroing and recording of different arc position data.

[0028] The handle assembly includes: a handle 101 and a first support rod 102. The upper end of the vertically arranged first support rod 102 is connected and fixed to the horizontally arranged handle 101 to achieve manual taking and placing.

[0029] A cylinder 302 is provided on the second support rod 104 on one side of the connecting rod 103. The cylinder 302 is rotatably arranged on the outer side of the second support rod 104. A disk 303 is provided at the lower end of the second support rod 104. The disk 303 is in frictional contact with the surface of the first pulley 105, so that when the first pulley 105 rolls, the disk 303 at the upper end thereof is driven to rotate by friction. When the disk 303 rotates, the cylinder 302 connected thereto is driven to rotate. A carbon paper 301 is pasted on the surface of the cylinder 302. A horizontally arranged description pen 304 is provided on the side of the telescopic rod 204 of the carbon paper 301. The writing position of the description pen 304 contacts the surface of the carbon paper 301. When the cylinder 302 rotates, the carbon paper 301 on its surface also moves synchronously. In this way, the description pen 304 can continuously describe the motion trajectory of the second pulley 205 when it rolls on the inner circular edge arc surface of the workpiece. Finally, the carbon paper 301 with recorded data is taken down, and the discrete degree of its trajectory is observed to judge whether the inner circular edge arc surface of the workpiece is smooth and uniform. If the trajectory is as follows: Figure 4 As shown in A, it means the curvature is uniform. Otherwise, Figure 4 As shown in B, it means that the curvature is uneven.

[0030] The description pen 304 is fixed on the telescopic rod 204 through the description leg 305. One end surface of the description pen 304 is provided with a thread and can be screwed and connected with the threaded hole on the end of the description leg 305, which is convenient for disassembly and regular replacement.

[0031] Example 2

[0032] The diameter of the disk 303 is greater than the diameter of the cylinder 302 , so that the cylinder 302 can continue to stay on the disk 303 while wrapping the carbon paper 301 .

[0033] The bottoms of the first pulley 105 and the second pulley 205 are on the same horizontal plane, and the diameter of the first pulley 105 is larger than that of the second pulley 205, so that even pulleys with different diameters can roll at the same time, and when rolling, the second pulley 205 with a smaller diameter is more sensitive to the smoothness of the arc surface, and can record the data of the arc change more accurately, thereby improving the measurement accuracy.

[0034] The vertical height of the second support rod 104 is greater than the vertical height of the cylinder 302 , and the diameter of the cylinder 302 is greater than the diameter of the second support rod 104 , so that the cylinder 302 sleeved on the second support rod 104 can rotate smoothly.

[0035] The above embodiment discloses a ruler for measuring the arc of the inner circle edge, wherein, during use, the handle 101 is held, the arc ruler is placed at the starting end of the arc surface of the inner circle edge of the workpiece, and then the handle 101 is released, and the first pulley 105 and the second pulley 205 begin to slide on the arc surface with the arc ruler. During the sliding process, the two second pulleys 205 will drive the telescopic rod 204 connected to the upper end thereof to move up and down, and the scale data of the piston indicator block will be retained on the two limit sleeves 202 respectively. At the same time, the first pulley 105 and the second pulley 205 will move up and down, and the scale data of the piston indicator block will be retained on the two limit sleeves 202 respectively. The rotation of the pulley 105 causes the disc 303 in contact with its upper end surface to rotate by friction, and the rotation of the disc 303 causes the cylinder 302 wrapped with the carbon paper 301 to rotate synchronously. The carbon paper 301 and the description pen 304 provided on one side of the telescopic rod 204 and threadedly connected to the description leg 305 are in contact with each other. When the arc ruler completes the detection and sliding of the inner circular edge arc surface of the workpiece, the description pen 304 also completes the trajectory of the carbon paper 301 at the same time. If the trajectory of the carbon paper 301 after unfolding is as follows Figure 4 As shown in A, it means the curvature is uniform. Otherwise, Figure 4 As shown in B, it means that the curvature is uneven.

[0036] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A ruler for measuring the arc of an inner circle, comprising a connecting rod (103), wherein the upper end of the connecting rod (103) is provided with a handle assembly for easy hand-holding, and a second support rod (104) is symmetrically provided on both sides of the lower end of the connecting rod (103), and each second support rod (104) is rotatably provided with a first pulley (105) at the lower end, characterized in that: The lower end of the connecting rod (103) is also symmetrically provided with two detection components for detecting the curvature.

2. A ruler for measuring the arc of an inner circle according to claim 1, characterized in that: The detection assembly comprises a limit sleeve (202), the limit sleeve (202) is fixedly arranged on the connecting rod (103), a scale (201) is provided on the surface of the limit sleeve (202), the limit sleeve (202) is made of a transparent material, a piston indicating block is slidably arranged inside the limit sleeve (202), a telescopic rod (204) is provided at the lower end of the piston indicating block, a second pulley (205) is rotatably arranged at the lower end of the telescopic rod (204), and the lower end of the piston indicating block is connected to the inner bottom of the limit sleeve (202) via a reset spring (203).

3. A ruler for measuring the arc of an inner circle according to claim 1, characterized in that: The handle assembly comprises a first support rod (102) arranged vertically, and a handle (101) arranged horizontally is provided at the upper end of the first support rod (102).

4. A ruler for measuring the arc of an inner circle according to claim 1, characterized in that: A cylinder (302) is provided on the second support rod (104) on one side of the connecting rod (103), and the cylinder (302) is rotatably arranged outside the second support rod (104). A disk (303) is provided at the lower end of the second support rod (104), and the disk (303) is in frictional contact with the surface of the first pulley (105). Carbon paper (301) is pasted on the surface of the cylinder (302), and a horizontally arranged description pen (304) is provided on the side of the telescopic rod (204) close to the carbon paper (301), and the writing position of the description pen (304) is in contact with the surface of the carbon paper (301).

5. A ruler for measuring the arc of an inner circle according to claim 4, characterized in that: The description pen (304) is fixed on the telescopic rod (204) via a description leg (305).

6. A ruler for measuring the arc of an inner circle according to claim 4, characterized in that: The diameter of the disk (303) is greater than the diameter of the cylinder (302).

7. A ruler for measuring the arc of an inner circle according to claim 2, characterized in that: The bottoms of the first pulley (105) and the second pulley (205) are on the same horizontal plane, and the diameter of the first pulley (105) is greater than the diameter of the second pulley (205).

8. A ruler for measuring the arc of an inner circle according to claim 4, characterized in that: The vertical height of the second support rod (104) is greater than the vertical height of the cylinder (302), and the diameter of the cylinder (302) is greater than the diameter of the second support rod (104).

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