Simple arc radius measuring instrument

Abstract

The utility model relates to the technical field of measuring instruments, and discloses a simple arc radius measuring instrument which comprises a main ruler, one end of the main ruler is connected with a circle center shaft, positioning rulers are distributed on the two sides of the circle center shaft, each positioning ruler comprises a positioning rod, a shaft groove is formed in each positioning rod, one end of each positioning rod is connected with a connecting rod, and the other end of each positioning rod is connected with a connecting rod. Spinning buckles are distributed at the two ends of the connecting rod, and the bottom ends of the spinning buckles are connected with a positioning disc. During measurement, the circle center position of the arc-shaped workpiece is obtained through the intersection point of the two groups of positioning rods 301, the measurement diameter data is obtained, the overall structure is simple and light, the intersection point of the workpiece is quickly found through the two groups of symmetrical positioning structures, the diameter data measurement process of the workpiece is convenient to operate, the overall volume structure is small, and the measurement precision is high. The two groups of positioning rods 301 can be matched with the shaft groove 302 and the knob 201 to slide and be folded at will, so that the device is convenient to carry and use after being stored, can be used in the measurement of arc-shaped workpieces in various occasions, and is accurate in measurement data.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring instruments, in particular to a simple arc radius measuring instrument. Background Art

[0002] In some circular parts inspection operations or actual production of circular parts, it is often necessary to measure the radius of an arc with a central angle less than 180°. When measuring the arc diameter of such parts, the existing measurement methods mainly include the arc template measurement method, the caliper method, and the bowstring method. Among them, the arc template measurement method mainly uses a radius ruler to manually measure the workpiece to ensure that the produced workpiece meets the standards, thereby ensuring the production and inspection quality.

[0003] In the prior art, a radius ruler is a tool for measuring the radius of an arc using the light gap method. During measurement, the measuring surface must be in complete and close contact with the arc of the workpiece. When there is no gap between the measuring surface and the arc of the workpiece, the radius of the arc of the workpiece is the number represented on the corresponding radius at this time.

[0004] The above prior art has obvious beneficial effects, but still has shortcomings:

[0005] In the above-mentioned prior art, since the radius gauge is measured by visual inspection during the measurement process, its measurement accuracy is not very high, and only qualitative measurement can be performed. There are five measuring points on each gauge, which makes the measurement of arc workpieces very limited. Some measuring instruments are complicated and cannot directly measure values. The operation is cumbersome and inconvenient to carry and use. Therefore, a simple arc radius measuring instrument is proposed. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a simple arc radius measuring instrument, which can adapt to the measurement of multiple groups of arc-shaped parts through the combination of two sets of adjustable positioning rulers and ruler rods. The positioning plates on both sides are fitted to the edges of the arc-shaped workpieces, and the vertical relationship between the positioning rods and the connecting rods is coordinated, so that the arc-shaped circular points of the measured workpiece can be quickly determined through the intersection of the positioning rods. The overall measurement method is accurate and the operation process is convenient.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a simple arc radius measuring instrument, comprising a main ruler, one end of the main ruler is connected to a center axis, and positioning rulers are distributed on both sides of the center axis, the positioning ruler comprises a positioning rod, and an axial groove is provided inside the positioning rod, one end of the positioning rod is connected to a connecting rod, and both ends of the connecting rod are distributed with buckles, and the bottom end of the buckle is connected to a positioning plate.

[0008] Preferably, the positioning disk forms a rotating structure with the two ends of the connecting rod through a turn buckle, and the positioning disk is symmetrically distributed along the centers of the two ends of the connecting rod.

[0009] Preferably, the center of the connecting rod is vertically connected to one end of the positioning rod, and the positioning rod forms a sliding structure with the central axis through the shaft groove.

[0010] Preferably, the main ruler comprises a ruler rod, and a glue layer is attached to the bottom surface of the ruler rod, a scale layer is arranged on the top surface of the ruler rod, and positioning rulers are distributed on both sides of the ruler rod.

[0011] Preferably, the bottom surface of the ruler rod is tightly fitted with the adhesive layer, and the scale layer is fixedly connected to the surface of the ruler rod.

[0012] Preferably, the central shaft includes a knob, and a bolt is provided at the bottom end of the knob, the bottom surface of the knob is fitted with an axis frame, and the outer walls around the axis frame are connected to a main scale and a positioning rod, and the bottom end of the axis frame is fixedly connected to an axis seat.

[0013] Preferably, the knob forms a threaded structure with the shaft seat through bolts, and the shaft frame is connected to the two sets of positioning rods.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. In the measurement, the utility model can locate the intersection point through the intersection position of the two sets of positioning rods, so that the intersection point is the arc center position of the workpiece, and then the measured diameter data is obtained by reading the scale layer. The overall structure is simple and light, not only the measurement process is convenient to operate, but also the overall volume is small, which is convenient to carry and use after storage. It has a wide range of applications in workpiece measurement in various occasions and has low production cost.

[0016] 2. The ruler rod and the axis frame in the utility model are both existing technologies. When in use, the user can first place the ruler rod on the surface of the arc-shaped workpiece, and adjust the positioning rulers and knobs on both sides to make the center axis of the circle be at the center position of the arc-shaped workpiece. By observing the scale layer on the surface of the ruler rod, the diameter data from the center axis to the edge of the arc-shaped workpiece that the ruler rod fits can be obtained. The rubber layer on the bottom of the ruler rod can be used to maintain a stable placement during the measurement process to reduce displacement.

[0017] 3. When measuring, the user can rotate the knob to tighten the bolt at the bottom of the knob and the shaft seat, so that the bottom of the knob presses the shaft frame, so that the shaft frame keeps the two sets of positioning rods and the ruler rod in a compressed state, which improves stability and facilitates measurement and observation.

[0018] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic diagram of the three-dimensional structure of the main body of the utility model;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the central axis of the utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model with the central axis unfolded;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the positioning ruler of the utility model;

[0023] Figure 5 It is a plan view of the measurement method of the utility model.

[0024] In the figure: 1, main ruler; 101, ruler rod; 102, rubber layer; 103, scale layer; 2, central axis; 201, knob; 202, bolt; 203, shaft frame; 204, shaft seat; 3, positioning ruler; 301, positioning rod; 302, shaft groove; 303, connecting rod; 304, buckle; 305, positioning plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this technical field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-4 A simple arc radius measuring instrument of this embodiment includes a main scale 1, one end of the main scale 1 is connected to a center axis 2, and positioning scales 3 are distributed on both sides of the center axis 2. The main scale 1 includes a ruler rod 101, and a glue layer 102 is attached to the bottom surface of the ruler rod 101, a scale layer 103 is provided on the top surface of the ruler rod 101, and positioning scales 3 are distributed on both sides of the ruler rod 101.

[0027] like Figure 1-5As shown, the measuring instrument in the utility model is similar to the existing measuring ruler structure. The main improvement of the utility model is that it can adapt to the measurement of multiple groups of arc-shaped parts by combining two sets of adjustable positioning rulers 3 with the ruler rod 101. The positioning plates 305 on both sides are fitted to the edges of the arc-shaped workpieces, and the vertical relationship between the positioning rod 301 and the connecting rod 303 is coordinated, so that the arc-shaped circular points of the measured workpiece can be quickly determined by the intersection of the positioning rods 301. The overall measurement method is accurate and the operation process is convenient; the ruler rod 101 and the shaft frame 203 in the utility model are both existing technologies. When in use, the user can first place the ruler rod 101 on the surface of the arc-shaped workpiece, and adjust the positioning rulers 3 on both sides and the knob 201 to make the center axis 2 of the arc-shaped workpiece at the center position. The diameter data of the edge of the arc-shaped workpiece fitted by the center axis 2 to the ruler rod 101 can be obtained by observing the scale layer 103 on the surface of the ruler rod 101, and the rubber layer 102 on the bottom surface of the ruler rod 101 can be used to maintain a stable placement during the measurement process to reduce displacement.

[0028] like Figure 2-3 As shown, the central shaft 2 includes a knob 201, and a bolt 202 is provided at the bottom end of the knob 201, an axis frame 203 is fitted on the bottom surface of the knob 201, and the outer walls around the axis frame 203 are connected to the main scale 1 and the positioning rod 301, and the bottom end of the axis frame 203 is fixedly connected to the axis seat 204, and the knob 201 of the instrument is at the zero scale position of the scale layer 103 on the surface of the ruler rod 101. After completing the adjustment of the ruler rod 101 and the positioning rulers 3 on both sides to adapt to the workpiece, the user can rotate the knob 201 to tighten the bolt 202 at the bottom end of the knob 201 and the axis seat 204, and then the bottom surface of the knob 201 is pressed against the axis frame 203, so that the axis frame 203 keeps the two sets of positioning rods 301 and the ruler rod 101 in a pressed state, thereby improving stability and facilitating measurement and observation.

[0029] like Figure 4-5As shown, the positioning ruler 3 includes a positioning rod 301, and an axial groove 302 is opened inside the positioning rod 301, one end of the positioning rod 301 is connected to a connecting rod 303, and both ends of the connecting rod 303 are provided with a rotary buckle 304, and the bottom end of the rotary buckle 304 is connected to a positioning disk 305. When measuring the arc radius of an arc-shaped workpiece, the user fits the symmetrical positioning disks 305 connected to the ends of the two sets of connecting rods 303 of the instrument with the arc-shaped edges of the workpiece, and then the positioning rod 301 vertically connected to the middle end of the connecting rod 303 is kept fixed, and the knob 201 in the axial groove 302 and one end of the ruler rod 101 are adaptively slidably adjusted in cooperation with the axial groove 302, and the intersection is located as the two sets of positioning rods 301 intersect. The knob 201 is at the center of the intersection, so that the intersection is the center of the arc of the workpiece. After the ruler rod 101 is stably fitted to the arc edge of the workpiece, the position of the arc edge of the workpiece reached by the knob 201 in the scale layer 103 is read to obtain the measured diameter data. The overall structure of this measuring instrument is simple and lightweight. The intersection of the workpiece can be quickly found through two sets of symmetrical positioning structures. Not only is the operation of the diameter data measurement process of the workpiece convenient, but the overall volume structure is small. The two sets of positioning rods 301 can be slid and folded at will in conjunction with the shaft groove 302 and the knob 201, which is convenient for carrying after storage. It can be used in the measurement of arc workpieces in various occasions, and the measurement data is accurate.

[0030] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A simple arc radius measuring instrument, comprising a main ruler (1), characterized in that: One end of the main ruler (1) is connected to a central axis (2), and positioning rulers (3) are distributed on both sides of the central axis (2), the positioning ruler (3) comprises a positioning rod (301), and an axis groove (302) is provided inside the positioning rod (301), one end of the positioning rod (301) is connected to a connecting rod (303), and both ends of the connecting rod (303) are distributed with rotary buckles (304), and the bottom end of the rotary buckle (304) is connected to a positioning plate (305).

2. A simple arc radius measuring instrument according to claim 1, characterized in that: The positioning disk (305) forms a rotating structure with the two ends of the connecting rod (303) through the rotating buckle (304), and the positioning disk (305) is symmetrically distributed along the two ends of the connecting rod (303).

3. A simple arc radius measuring instrument according to claim 1, characterized in that: The center of the connecting rod (303) is vertically connected to one end of the positioning rod (301), and the positioning rod (301) forms a sliding structure with the central axis (2) through the shaft groove (302).

4. The simple arc radius measuring instrument according to claim 1, characterized in that: The main ruler (1) comprises a ruler rod (101), wherein the bottom surface of the ruler rod (101) is bonded with a glue layer (102), the top surface of the ruler rod (101) is provided with a scale layer (103), and positioning rulers (3) are distributed on both sides of the ruler rod (101).

5. A simple arc radius measuring instrument according to claim 4, characterized in that: The bottom surface of the ruler rod (101) is tightly fitted with the adhesive layer (102), and the scale layer (103) is fixedly connected to the surface of the ruler rod (101).

6. The simple arc radius measuring instrument according to claim 1, characterized in that: The central shaft (2) comprises a knob (201), and a bolt (202) is arranged at the bottom end of the knob (201), a shaft frame (203) is fitted on the bottom surface of the knob (201), and the outer walls around the shaft frame (203) are connected to the main scale (1) and the positioning rod (301), and the bottom end of the shaft frame (203) is fixedly connected to the shaft seat (204).

7. A simple arc radius measuring instrument according to claim 6, characterized in that: The knob (201) forms a threaded structure with the shaft seat (204) through the bolt (202), and the shaft frame (203) is connected to two sets of positioning rods (301).

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