A vernier caliper for measuring inner and outer diameters

Abstract

The present invention discloses a vernier caliper for measuring inner and outer diameters, comprising a ruler, a measuring slider, a push rod slider and a micrometer. The measuring slider and the push rod slider are movably sleeved on the ruler and locked with a locking screw. A micrometer is installed above the measuring slider, and a telescopic probe of the micrometer is against a telescopic measuring head assembly. The measuring head assembly is installed above the inner side of the measuring slider, and a push rod is installed above the push rod slider along the ruler direction, and the inner end of the push rod is directly opposite to the inner end center of the telescopic measuring head assembly. The present invention fixes the fixed specification size of the micrometer or the dial gauge through the measuring slider and the push rod slider, and realizes the change of the size on the micrometer or the dial gauge through the positioning and extension of the telescopic measuring head assembly and touching the telescopic probe of the micrometer, which can adapt to the accurate measurement of the outer diameter and the inner diameter (diameter and ball diameter), and the measurement is convenient and fast, and can adapt to the adjustment of different specifications, greatly reducing the equipment cost, and the measurement is accurate and stable.

Description

Technical Field

[0001] The invention belongs to the technical field of calipers, and in particular relates to a vernier caliper for measuring inner and outer diameters. Background Art

[0002] Vernier calipers are widely used high-precision measuring tools, which consist of a main scale and a sliding vernier attached to the main scale. However, existing vernier calipers cannot achieve accurate measurement when measuring the inner and outer diameters of spheres. Moreover, they use a dedicated ruler for measurement, which cannot adapt to changes in the inner diameter, require multiple specifications, and are costly. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a vernier caliper for measuring inner and outer diameters to solve the problems existing in the prior art.

[0004] The technical solution adopted by the present invention is: a vernier caliper for measuring inside and outside diameters, comprising a ruler, a measuring slider, a push rod slider and a micrometer. The measuring slider and the push rod slider are movably connected to the ruler and locked with locking screws. A micrometer is installed above the measuring slider. The telescopic probe of the micrometer rests on the telescopic measuring head assembly. The measuring head assembly is installed above the inner side of the measuring slider. A push rod is installed above the push rod slider along the direction of the ruler, and the inner end of the push rod is opposite to the center of the inner end of the telescopic measuring head assembly.

[0005] Preferably, the micrometer is replaced by a dial indicator.

[0006] Preferably, the telescopic measuring head assembly comprises an outer sleeve, an inner sleeve, an ejector pin and a push rod, symmetrical cantilevers are arranged on both sides of the outer sleeve, the ends of the cantilevers are rotatably connected with positioning guide wheels, the inner sleeve is movably embedded in the outer sleeve, an inner convex ring is arranged near the front end of the inner sleeve, an outer convex ring is arranged at the rear end of the outer sleeve, a reset spring is sleeved on the inner sleeve, the two ends of the reset spring respectively abut against the inner convex ring and the outer convex ring, a limited anti-slip ring is fixedly connected to the outer cylindrical surface at the front end of the inner sleeve, the outer diameter of the limited anti-slip ring is larger than the inner diameter of the inner convex ring, an ejector pin is installed at the front end center of the push rod, and the rear end is movably embedded in The push rod is inserted into the inner sleeve and the center of the rear end face rests on the telescopic probe of the micrometer. The push rod is provided with an outer convex ring 2 near the front end and a reset spring 2 is sleeved on the rod part. The rear end of the inner sleeve is embedded in the limited position connecting sleeve. The two ends of the reset spring 2 respectively rest against the outer convex ring 2 and the limit connecting sleeve. The limit connecting sleeve is movably sleeved with the push rod. The inner sleeve and the limit connecting sleeve are fixedly connected to the support plate. The support plate is fixedly connected to the measuring slide block. The inner diameter of the outer sleeve is larger than the outer diameter of the cylindrical head at the upper end of the support plate. A U-shaped notch is provided on the lower side. The width of the U-shaped notch is larger than the width of the support plate.

[0007] Preferably, both ends of the push rod are detachably connected with measuring contacts, the measuring contacts are of a conical structure and the ends of the conical structure are ball heads.

[0008] Preferably, the lower portion of the telescopic measuring head assembly is fixedly connected to the measuring slide block via a positioning pin and a fixing screw.

[0009] Preferably, the locking screw abuts against a cushion block, and the cushion block is located at the bottom of the ruler mounting through hole of the measuring slider or the push rod slider and contacts the bottom of the ruler.

[0010] Preferably, the probe tube of the micrometer is inserted into the mounting hole on the measuring slide and then locked with screws, an opening is arranged at the top of the mounting hole, and the screws vertically connect the two sides of the opening.

[0011] Beneficial effects of the present invention: Compared with the prior art, the present invention fixes the fixed specifications and dimensions of the micrometer or dial indicator by measuring the slider and the push rod slider, and realizes the change of the dimension on the micrometer or dial indicator by positioning and retracting the telescopic measuring head assembly and touching the telescopic probe of the micrometer. It can adapt to the precise measurement of the outer diameter and inner diameter (diameter and ball diameter), the measurement is convenient and fast, and it can adapt to the adjustment of different specifications, which greatly reduces the equipment cost and the measurement is accurate and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front structural schematic diagram of the present invention;

[0013] Figure 2 It is a schematic diagram of the structure of the telescopic measuring head assembly;

[0014] Figure 3 This is a schematic diagram of the telescopic measuring head assembly structure (without the support plate);

[0015] Figure 4 Schematic diagram of the jacket structure;

[0016] Figure 5 is a schematic diagram of the support plate structure;

[0017] Figure 6 It is a schematic diagram of the side view structure of the measuring slider;

[0018] Figure 7 It is a schematic diagram of the side view of the structure of the ejector slider;

[0019] Figure 8 This is a schematic diagram of the outer diameter measurement structure. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Example 1: Figure 1-Figure 8As shown, a vernier caliper for measuring inner and outer diameters comprises a ruler 1, a measuring slider 2, a push rod slider 4 and a micrometer 6. The measuring slider 2 and the push rod slider 4 are movably sleeved on the ruler 1 and locked with a locking screw 8. The micrometer 6 is installed above the measuring slider 2. The telescopic probe of the micrometer 6 abuts against the telescopic measuring head assembly 3. The measuring head assembly 3 is installed above the inner side of the measuring slider 2. A push rod 5 is installed above the push rod slider 4 along the ruler direction. The inner end of the push rod 5 is opposite to the inner end center of the telescopic measuring head assembly 3. The micrometer can be replaced by a dial indicator.

[0022] Preferably, the telescopic measuring head assembly 3 comprises an outer sleeve 301, an inner sleeve 302, an ejector pin 303 and a push rod 304. Symmetrical cantilevers 305 are arranged on both sides of the outer sleeve 301. The ends of the cantilevers 305 are rotatably connected with positioning guide wheels 306. The inner sleeve 302 is movably embedded in the outer sleeve 301. An inner convex ring 307 is arranged near the front end of the inner sleeve 302. An outer convex ring 308 is arranged at the rear end of the outer sleeve 301. A reset spring 309 is sleeved on the inner sleeve 302. The two ends of the reset spring 309 respectively abut against the inner convex ring 307 and the outer convex ring 308. A limited anti-slip ring 310 is fixedly connected to the outer cylindrical surface at the front end of the inner sleeve 302. The outer diameter of the limited anti-slip ring 310 is larger than the inner diameter of the inner convex ring 307. An ejector pin 303 is installed at the front end center of the push rod 304. The rear end is movably embedded in the inner sleeve 302 and the center of the rear end face abuts against the telescopic probe of the micrometer 6. The push rod 304 is provided with an outer convex ring 2 311 near the front end and a return spring 2 312 is sleeved on the rod. The rear end of the inner sleeve 302 is embedded in a limited position connecting sleeve 313. The two ends of the return spring 2 312 respectively abut against the outer convex ring 2 311 and the limit connecting sleeve 313. The limit connecting sleeve 313 movably sleeves the push rod 304. The inner sleeve 302 and the limit connecting sleeve 313 are fixedly connected to the support plate 314. The support plate 314 is fixedly connected to the measuring slider 1. The inner diameter of the outer sleeve 301 is larger than the outer diameter of the cylindrical head at the upper end of the support plate 314. A U-shaped notch 315 is provided on the lower side. The width of the U-shaped notch 315 is larger than the width of the support plate 314.

[0023] Preferably, both ends of the push rod 5 are detachably connected with measuring contacts 7, and the measuring contacts 7 are of a conical structure with a ball head at the end of the conical structure.

[0024] Preferably, the lower portion of the telescopic measuring head assembly 3 is fixedly connected to the measuring slide block 2 via a positioning pin 10 and a fixing screw 11 .

[0025] Preferably, the locking screw 8 abuts against a cushion block 9 , and the cushion block 9 is located at the bottom of the ruler mounting through hole of the measuring slider 2 or the push rod slider 4 and contacts the bottom of the ruler 1 .

[0026] Preferably, the probe tube of the micrometer 4 is inserted into the mounting hole on the measuring slide 2 and then locked with screws. An opening is provided at the top of the mounting hole, and the screws vertically connect the two sides of the opening.

[0027] Principle of use: When measuring the outer diameter, Figure 1 As shown, before measurement, the dial indicator or micrometer is zeroed. When the ball diameter or diameter to be measured is A, adjust the measuring slider and the ejector slider to the appropriate position and fix them to ensure that the distance between the measuring contact and the ejector pin of the telescopic measuring head assembly 3 is A. When the telescopic measuring head assembly 3 and the measuring contact are brought into contact with the outer cylinder of the component to be measured with a diameter of A, the measurement data on the micrometer is B (clockwise rotation is a positive value, counterclockwise rotation is a negative value), and the measurement result is A+B.

[0028] When measuring the inner diameter, the measuring slide block needs to be inserted into the ruler in reverse, so that the telescopic measuring head assembly 3 faces outward and the micrometer faces inward. The measuring method is similar to the outer diameter measurement.

[0029] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vernier caliper for measuring inner and outer diameters, characterized in that: The invention comprises a ruler (1), a measuring slide block (2), a push rod slide block (4) and a micrometer (6), wherein the measuring slide block (2) and the push rod slide block (4) are movably sleeved on the ruler (1) and locked by a locking screw (8), a micrometer (6) is installed above the measuring slide block (2), a telescopic probe of the micrometer (6) abuts against a telescopic measuring head assembly (3), the measuring head assembly (3) is installed above the inner side of the measuring slide block (2), a push rod (5) is installed above the push rod slide block (4) along the ruler direction, and the inner end of the push rod (5) is directly opposite to the inner end center of the telescopic measuring head assembly (3); The telescopic measuring head assembly (3) comprises an outer sleeve (301), an inner sleeve (302), a pin (303) and a push rod (304). Symmetrical cantilevers (305) are arranged on both sides of the outer sleeve (301). The ends of the cantilevers (305) are rotatably connected to positioning guide wheels (306). The inner sleeve (302) is movably embedded in the outer sleeve (301). An inner convex ring (307) is arranged near the front end of the inner sleeve (302). An outer convex ring (307) is arranged at the rear end of the outer sleeve (301). A convex ring (308), the inner sleeve (302) is sleeved with a return spring (309), the two ends of the return spring (309) respectively abut against the inner convex ring (307) and the outer convex ring (308), the front end outer cylindrical surface of the inner sleeve (302) is fixedly connected with a limited anti-slip ring (310), the outer diameter of the limited anti-slip ring (310) is larger than the inner diameter of the inner convex ring (307), the front end center of the push rod (304) is installed with a ejector pin (303), and the rear end is movably embedded in the inner sleeve (304). The center of the rear end face of the push rod (304) is against the telescopic probe of the micrometer (6), the push rod (304) is provided with an outer convex ring (311) near the front end and a return spring (312) is sleeved on the rod part, the rear end of the inner sleeve (302) is embedded in the limit connection sleeve (313), the two ends of the return spring (312) are respectively against the outer convex ring (311) and the limit connection sleeve (313), and the limit connection sleeve (313) is movably sleeved on the push rod (304). 4), the inner sleeve (302) and the limit connection sleeve (313) are fixedly connected to the support plate (314), and the support plate (314) is fixedly connected to the measuring slider (1); the inner diameter of the outer sleeve (301) is larger than the outer diameter of the cylindrical head at the upper end of the support plate (314), and a U-shaped notch (315) is provided on the lower side, and the width of the U-shaped notch (315) is larger than the width of the support plate (314); and the two ends of the push rod (5) are detachably connected to the measuring contacts (7).

2. A vernier caliper for measuring inner and outer diameters according to claim 1, characterized in that: Replace the micrometer (6) with a dial indicator.

3. The inner and outer diameter measuring vernier caliper according to claim 1, characterized in that: The measuring contact (7) is a conical structure and the end of the conical structure is a ball head.

4. The inner and outer diameter measuring vernier caliper according to claim 1, characterized in that: The lower part of the telescopic measuring head assembly (3) is fixedly connected to the measuring slide block (2) via a positioning pin (10) and a fixing screw (11).

5. The inner and outer diameter measuring vernier caliper according to claim 1, characterized in that: The locking screw (8) abuts against a cushion block (9), which is located at the bottom of the ruler mounting through hole of the measuring slide block (2) or the push rod slide block (4) and contacts the bottom of the ruler (1).

6. The inner and outer diameter measuring vernier caliper according to claim 1, characterized in that: The probe tube of the micrometer (4) is inserted into the mounting hole on the measuring slide block (2) and then locked with screws. An opening is provided at the top of the mounting hole, and the screws vertically connect the two sides of the opening.

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