Caliper capable of being expanded to measure small-diameter hole

Abstract

The utility model discloses a caliper capable of being expanded to measure small-diameter holes, which comprises a main scale and a vernier scale, and the main scale comprises a left inner claw located below the left side of a main scale body and a left outer claw located above the left side of the main scale body. The vernier scale comprises a movable right inner claw located below the main scale body and a movable right outer claw located above the main scale body, the right inner claw is located on the right side of the left inner claw, the right outer claw is located on the right side of the left outer claw, the left inner claw and the right inner claw form a pair of inner measuring claws, and the left outer claw and the right outer claw form a pair of outer measuring claws. The top end cutting edge forming side face of the inner measuring claw and the top end cutting edge forming side face of the outer measuring claw are both semicircular cutting edges. According to the utility model, on the basis of keeping the measuring function and precision of the original caliper type measuring tool, the measuring precision of the small-diameter hole with the aperture of # imgabs0 # can be met, the accurate measurement of the machining precision of the small-diameter hole in the production field is ensured, the production precision and the production efficiency are improved, and the measuring tool is suitable for various precision machinery manufacturing places.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement in machining, and relates to a caliper that can be extended to measure holes with smaller diameters, specifically a caliper that can be used for measuring the inner diameter and related position dimensions of holes with smaller diameters. Background Art

[0002] In the machining of military product parts, many parts often have holes with smaller diameters processed. After processing, vernier calipers or digital calipers and other calipers are required to measure and inspect on the machining site to determine whether the shape dimensions and position dimensions of the small-diameter holes are qualified, so as to adjust the machining in time. Since the top edge of the measuring jaws of the current calipers forms a side surface that is a flat section with a certain width, the front end of the inner measuring jaws is a blade cross-section with a width of 0.2 mm - 0.4 mm, while the front end of the outer measuring jaws is a blade cross-section with a width of 0.6 mm - 0.8 mm. This causes the calipers to when measuring holes with smaller diameters, the top of the measuring jaws cannot closely fit the hole wall of the measured hole after penetrating into holes with diameters below a certain value, resulting in serious errors in the measurement results of the calipers, affecting the machining accuracy and production efficiency. In this material description, the diameter unit is mm. Summary of the Utility Model

[0003] (1) Purpose of the Utility Model

[0004] The purpose of the utility model is: to improve the measurement accuracy of the caliper for measuring holes with smaller diameters and meet the requirements of rapid measurement on the production site. The utility model provides a caliper that can be extended to measure holes with smaller diameters, which can not only meet the previous measurement requirements of ordinary calipers, but also be used for measuring the inner diameter dimensions and related position dimensions of holes with smaller diameters.

[0005] (2) Technical Solution

[0006] To solve the above technical problems, the utility model provides a caliper that can be extended to measure holes with smaller diameters, which includes a main scale (1) and a vernier scale (2). The main scale (1) includes a left inner jaw located below the left side of the main scale body and a left outer jaw located above the left side of the main scale body. The vernier scale (2) includes a right inner jaw located below the main scale body and movable, and a right outer jaw located above the main scale body and movable. The right inner jaw is located on the right side of the left inner jaw, and the right outer jaw is located on the right side of the left outer jaw. The left inner jaw and the right inner jaw form a pair of inner measuring jaws, and the left outer jaw and the right outer jaw form a pair of outer measuring jaws. The side surfaces formed by the top edges of the inner measuring jaws and the side surfaces formed by the top edges of the outer measuring jaws are both semi-circular edges.

[0007] Among them, the front end of the cutting edge of the inner measuring jaw is a semi-circle with a radius of 0.4 mm - 0.5 mm, preferably a semi-circle with a radius of 0.4 mm. When measuring the inner hole, it can fit tangentially with the inner wall of the inner hole, and can accurately measure the diameter of the hole. The diameter dimensions of the above holes and the distance dimensions between the holes.

[0008] The front end of the cutting edge of the outer measuring jaw is a semi-circle with a diameter of 0.8 mm - 1.0 mm, preferably a semi-circle with a diameter of 0.8 mm. When measuring the diameter dimension of the hole and the distance dimension between the holes, it can fit tangentially with the inner wall of the inner hole, and can accurately measure the diameter of the hole. The relevant distance dimensions of the above holes.

[0009] Measurement scale lines are provided on the main scale 1.

[0010] Measurement scale lines are provided on the vernier scale 2.

[0011] A limit plate is fixedly installed at the right end of the main scale 1, and a hanging ring is provided on the limit plate.

[0012] A positioning fastening bolt is provided on the vernier scale 2.

[0013] (III) Beneficial effects

[0014] The caliper provided by the above technical solution can be extended to measure holes with a smaller diameter. On the basis of maintaining the measurement function and measurement accuracy of the original caliper type measuring tool, it can also meet the measurement accuracy of holes with a smaller diameter within a certain range, ensure the accurate measurement of the machining accuracy of holes with a smaller diameter at the production site, improve the production accuracy and production efficiency, and is applicable to various precision machinery manufacturing sites. Between, the measurement accuracy of holes with a smaller diameter is guaranteed, the machining accuracy of holes with a smaller diameter at the production site is accurately measured, the production accuracy and production efficiency are improved, and it is applicable to various precision machinery manufacturing sites. Description of the drawings

[0015] Figure 1 is a three-dimensional schematic diagram of the caliper of the present invention measuring the distance between two holes on a part;

[0016] Figure 2 is a semi-sectional schematic diagram of the part of the caliper of the present invention measuring the distance between two holes on a part;

[0017] Figure 3 is a three-dimensional schematic diagram of a pair of outer measuring jaws of the caliper of the present invention;

[0018] Figure 4 is a three-dimensional schematic diagram of a pair of inner measuring jaws of the caliper of the present invention;

[0019] Figure 5 is an overall schematic diagram of the caliper of the present invention;

[0020] Figure 6 is a schematic diagram of the semi-circular cutting edge of the inner measuring jaw of the caliper of the present invention;

[0021] Figure 7 It is a schematic diagram of the semi-circular cutting edge of the outer measuring jaws of the caliper of the present utility model. Specific embodiments

[0022] To make the objectives, content and advantages of the present utility model clearer, the following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings and embodiments.

[0023] Referring to Figures 5 to 7 As shown, the caliper of this embodiment that can be extended to measure holes with smaller diameters includes a main scale 1 and a vernier scale 2. The main scale 1 includes a left inner jaw located below the left side of the main scale body and a left outer jaw located above the left side of the main scale body. The vernier scale 2 includes a right inner jaw that is movable and located below the main scale body and a right outer jaw that is movable and located above the main scale body. The right inner jaw is located on the right side of the left inner jaw, and the right outer jaw is located on the right side of the left outer jaw. The left inner jaw and the right inner jaw form a pair of inner measuring jaws, and the left outer jaw and the right outer jaw form a pair of outer measuring jaws. The side surfaces formed by the top cutting edges of the inner measuring jaws and the side surfaces formed by the top cutting edges of the outer measuring jaws are both semi-circular cutting edges.

[0024] Among them, the front end of the cutting edge of the inner measuring jaw is a semi-circle with a radius of 0.4 mm - 0.5 mm, preferably a semi-circle with a radius of 0.4 mm, which can fit tangentially with the inner wall of the inner hole when measuring the inner hole, and can accurately measure the diameter of the hole The above diameters of each hole and the distance dimensions between the holes.

[0025] The front end of the cutting edge of the outer measuring jaw is a semi-circle with a diameter of 0.8 mm - 1.0 mm, preferably a semi-circle with a diameter of 0.8 mm, which can fit tangentially with the inner wall of the inner hole when measuring the diameter dimension of the hole and the distance dimension between the holes, and can accurately measure the diameter of the hole The above relevant distance dimensions of each hole.

[0026] Measurement scale lines are provided on the main scale 1.

[0027] Measurement scale lines are provided on the vernier scale 2.

[0028] A limit plate is fixedly installed at the right end of the main scale 1, and a hanging ring is provided on the limit plate.

[0029] A positioning fastening bolt is provided on the vernier scale 2.

[0030] As Figure 1 shown, it is the distance between two holes measured by a pair of outer measuring jaw cutting edges of the caliper of this embodiment on a part.

[0031] As Figure 2 shown, when the caliper of this embodiment measures the distance between two holes on a part, the front semi-circular cutting edges of a pair of outer measuring jaws fit tangentially with the inner walls of the two holes.

[0032] As Figure 3 shown, it is the front semi-circular edge shape of a pair of outer measuring jaws of the caliper in this embodiment.

[0033] As Figure 4 shown, it is the front semi-circular edge shape of a pair of inner measuring jaws of the caliper in this embodiment.

[0034] When measuring the relevant dimensions of a hole, wipe the measuring jaws of the caliper clean, hold the caliper horizontally, move the measuring jaws of the main scale 1 and the vernier scale 2, and make the front semi-circular edge of the measuring jaws fit the inner wall of the hole to be measured. Since the edge at the front of the measuring jaws is a semi-circular edge, it can be in close tangential contact with the inner wall of the hole without gaps, and the inner diameter dimension of the small-diameter hole and the relevant position dimensions of the hole can be accurately measured.

[0035] This embodiment can be applied to calipers and digital calipers, effectively improving the precision of caliper measurement and being widely used in production. The caliper in this embodiment is reliable and convenient to use. The usage method of the caliper remains unchanged, but it can be used for precise measurement of the inner diameter and position dimensions of the above apertures, effectively improving the measurement range and measurement accuracy at the mechanical processing site.

[0036] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A caliper that can be extended to measure smaller diameter holes, characterized in that: The invention comprises a main scale (1) and a vernier scale (2), wherein the main scale (1) comprises a left inner jaw located at the lower left side of the main scale body and a left outer jaw located at the upper left side of the main scale body, and the vernier scale (2) comprises a right inner jaw located at the lower left side of the main scale body and movable, and a right outer jaw located at the upper left side of the main scale body and movable, the right inner jaw being located at the right side of the left inner jaw, and the right outer jaw being located at the right side of the left outer jaw, the left inner jaw and the right inner jaw forming a pair of inner measuring jaws, and the left outer jaw and the right outer jaw forming a pair of outer measuring jaws, and the top edge forming side surfaces of the inner measuring jaws and the top edge forming side surfaces of the outer measuring jaws are both semicircular edge surfaces.

2. A caliper expandable to measure smaller diameter holes as claimed in claim 1, characterized in that: The front end of the cutting edge of the inner measuring claw is a semicircle with a radius of 0.4mm-0.5mm.

3. A caliper expandable to measure smaller diameter holes as claimed in claim 2, characterized in that: The front end of the cutting edge of the inner measuring claw is a semicircle with a radius of 0.4 mm.

4. A caliper expandable to measure smaller diameter holes as claimed in claim 2, characterized in that: The front end of the cutting edge of the outer measuring claw is a semicircle with a diameter of 0.8mm-1.0mm.

5. A caliper expandable to measure smaller diameter holes as claimed in claim 4, characterized in that: The front end of the cutting edge of the outer measuring claw is a semicircle with a diameter of 0.8 mm.

6. A caliper expandable to measure smaller diameter holes as claimed in claim 4, characterized in that: The main ruler (1) is provided with measuring scale lines.

7. A caliper expandable to measure smaller diameter holes as claimed in claim 6, characterized in that: The vernier ruler (2) is provided with measuring scale lines.

8. A caliper expandable to measure smaller diameter holes as claimed in claim 7, characterized in that: A limit plate is fixedly mounted on the right end of the main scale (1).

9. A caliper expandable to measure smaller diameter holes as claimed in claim 8, characterized in that: A hanging ring is arranged on the limiting plate.

10. A caliper expandable to measure smaller diameter holes as claimed in claim 9, characterized in that: The vernier scale (2) is provided with a positioning fastening bolt.

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