Extension rod suitable for wide-range lever micrometer

Abstract

The utility model belongs to the technical field of measuring tools, and discloses an extension rod suitable for a wide-range lever micrometer, which comprises a solid rod body, the positioning end of the solid rod body is a flat end face, and a first positioning ball is embedded in the center of the flat end face; the connecting end of the solid rod body is an expansion sleeve opening, the expansion sleeve opening is used for being arranged on a micrometer rod of a micrometer in a sleeving mode, the outer surface of the expansion sleeve opening is provided with a connecting thread, the connecting thread is in threaded connection with a locking nut, a second positioning ball is embedded in the expansion sleeve opening, and the second positioning ball is partially exposed out of the end face of the solid rod body; through the arrangement of the extension rod, the problem that the measurement range is adjusted frequently by replacing adjustment rod combinations of different specifications is solved, and the measurement efficiency is greatly improved. And on the other hand, one end of the extension sleeve is fixedly connected to the micrometer rod of the micrometer through the expansion sleeve opening during measurement, the extension sleeve is always coaxial with the micrometer rod in the measurement process, and the measurement precision is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of measuring instrument, especially relates to a large range lever micrometer suitable for extension rod. BACKGROUND

[0002] As an important precision measuring tool in the field of mechanical manufacturing, the large range type of lever micrometer (the measurement range is usually more than 125mm) often needs to be expanded by adjusting rod when measuring large workpieces or deep groove structures. In the prior art, the operator adjusts the measurement range by replacing adjusting rods of different specifications, but the traditional adjusting rod needs to be adjusted frequently, which not only reduces the measurement efficiency (the time consumed by single measurement increases by 40%-60%), but also increases the cumulative error due to multiple clamping. On the other hand, the adjusting rod is in a suspended state without fixing mechanism at both ends during measurement, and the influence of its own weight during the measurement process will cause the adjusting rod to be out of alignment, resulting in measurement error.

[0003] For the above problems, the industry has tried to optimize by increasing the types or improving the material performance of the adjusting rod, but has not been able to break through the problems caused by the combined structure. There is an urgent need for an extension rod structure with high rigidity and quick disassembly and adaptation characteristics, which can break through the physical size constraints of traditional adjusting rods and ensure the accuracy and stability of the measurement chain by optimizing the mechanical distribution, thereby improving the applicability of large range lever micrometers in complex industrial scenarios. SUMMARY

[0004] The utility model aims at solving the problems in the prior art, and provides a large range lever micrometer suitable for extension rod, which adopts the technical scheme of:

[0005] A large range lever micrometer suitable for extension rod, comprising a solid rod body, the positioning end of the solid rod body is a flat end face, a first positioning ball is embedded in the center of the flat end face, and the first positioning ball partially protrudes from the flat end face;

[0006] The connecting end of the solid rod body is an expansion sleeve opening, the expansion sleeve opening is used for sleeving on the micrometer rod, a connecting thread is arranged on the outer surface of the expansion sleeve opening, a locking nut is threadedly connected to the connecting thread, a second positioning ball is embedded in the expansion sleeve opening, and the second positioning ball partially protrudes from the end face of the solid rod body.

[0007] Preferably, a mesh surface knurling is arranged on the inner wall of the expansion sleeve opening.

[0008] Preferably, the expansion sleeve opening and the solid rod body are integrally connected.

[0009] Preferably, the expansion sleeve opening and the solid rod body are detachably threadedly connected.

[0010] Preferably, the first positioning ball and the second positioning ball are both outwardly convex, and the diameter of the first positioning ball is greater than the diameter of the second positioning ball.

[0011] Preferably, the extension length of the solid rod body is 25 mm, 50 mm or 75 mm, wherein the distance between the first positioning ball and the second positioning ball relative to the distal end is the extension length of the extension rod.

[0012] The application has the beneficial effects that: through the setting of the extension rod, the problem of frequent adjustment combination for realizing the adjustment of the measurement range by replacing different specifications of adjustment rod combinations is solved, and the measurement efficiency is greatly improved. On the other hand, during measurement, one end of the extension rod is fixedly connected to the micrometer rod of the micrometer through the expansion sleeve opening, and during the measurement process, the extension rod is always coaxial with the micrometer rod, and the measurement accuracy is high. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the application;

[0014] Figure 2 It is a perspective view of the application; Figure 1

[0015] Figure 3 It is a use state view of the application. DETAILED DESCRIPTION

[0016] The application will be further described below in combination with the drawings.

[0017] As shown in the drawings, the application comprises a solid rod body 5, the positioning end of the solid rod body 5 is a flat end face, a first positioning ball 6 is embedded in the center of the flat end face, and the first positioning ball 6 partially exposes the flat end face; Figures 1 to 3 The connecting end of the solid rod body 5 is an expansion sleeve opening 3, the expansion sleeve opening 3 is formed by cutting a four-part arc-shaped tube 1 along the axial direction, the expansion sleeve opening 3 is used for sleeving on the micrometer rod 10 of the micrometer, a connecting thread 2 is arranged on the outer surface of the expansion sleeve opening 3, a locking nut 9 is threadedly connected to the connecting thread 2, and a second positioning ball 4 is embedded in the expansion sleeve opening 3, and the second positioning ball 4 partially exposes the end face of the solid rod body 5.

[0018] A mesh surface knurl 7 is arranged on the inner wall of the expansion sleeve opening 3 to further increase the holding force between the micrometer rod 10 of the micrometer and the expansion sleeve opening 3, and the expansion sleeve opening 3 and the solid rod body 5 are integrally connected or can be detachably threadedly connected. The first positioning ball 6 and the second positioning ball 4 are both outwardly convex, and the diameter of the first positioning ball 6 is greater than the diameter of the second positioning ball 4.

[0019]

[0020] ​​According to the change of the detected instrument specification and size, the extension length of the solid rod body 5 is set to three specifications of 25mm, 50mm or 75mm, wherein the distance between the first positioning ball 6 and the second positioning ball 4 relative to the distal end is the extension length of the extension rod.

[0021] In use, the solid rod body 5 of different lengths is selected according to the specification of the detected instrument, for example, a length of 50mm is selected, the expansion sleeve opening 3 is used to be sleeved on the micrometer rod 10 of the micrometer, the end of the micrometer rod 10 is abutted on the spherical surface of the second positioning ball 4, at this time, the solid rod body 5 and the micrometer rod 10 are stably connected by rotating the locking nut 9, then the micrometer rotary cylinder 11 is rotated, the micrometer rod 10 and the solid rod body 5 are close to the measuring anvil 8, when the first positioning ball 6 is abutted on the measuring anvil 8, the rotation is stopped, then the micrometer reading is returned to zero, the micrometer rotary cylinder 11 is reversely rotated, the detected instrument is placed between the measuring anvil 8 and the solid rod body 5, the micrometer rotary cylinder 11 is rotated again, when the two ends of the detected instrument are abutted on the measuring anvil 8 and the first positioning ball 6 respectively, the measurement value is read out.

[0022] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. An extension rod suitable for a large-range lever micrometer, characterized in that, It includes a solid rod body, the positioning end of which is a flat end face, and a first positioning ball is embedded in the center of the flat end face, with the first positioning ball partially exposed on the flat end face; The connecting end of the solid rod body is an expansion sleeve opening, which is used to fit onto the micrometer rod of the micrometer. A connecting thread is provided on the outer surface of the expansion sleeve opening, and a locking nut is threaded onto the connecting thread. A second positioning ball is embedded in the expansion sleeve opening, and the second positioning ball partially protrudes from the end face of the solid rod body.

2. The extension rod for a large-range lever micrometer according to claim 1, characterized in that, The inner wall of the expansion sleeve opening is provided with a mesh-like textured surface.

3. The extension rod for a large-range lever micrometer according to claim 1, characterized in that, The expansion sleeve opening is integrally formed and connected to the solid rod body.

4. The extension rod for a large-range lever micrometer according to claim 1, characterized in that, The expansion sleeve opening is detachably threaded to the solid rod body.

5. The extension rod for a large-range lever micrometer according to any one of claims 1 to 4, characterized in that, Both the first positioning ball and the second positioning ball protrude outwards, and the diameter of the first positioning ball is larger than the diameter of the second positioning ball.

6. The extension rod for a large-range lever micrometer according to claim 1, characterized in that, The extension length of the solid rod body is 25mm, 50mm or 75mm, wherein the distance between the far ends of the first positioning ball and the second positioning ball is the extension length of the extension rod.

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