CN-121994101-A - Quick and stable measuring device for large outside micrometer

CN121994101ACN 121994101 ACN121994101 ACN 121994101ACN-121994101-A

Abstract

The invention discloses a rapid and stable measuring device of a large outside micrometer, which comprises a supporting seat and four supporting rods, wherein the four supporting rods are arranged around the center of the supporting seat at equal intervals, the supporting seat is detachably arranged on one end of a micrometer frame of the large outside micrometer, the supporting rods are arranged on the supporting seat, the head parts of the supporting rods are arranged towards the other end of the micrometer frame, and the head parts of the supporting rods are configured to be capable of extending or retracting relative to the one end of the micrometer frame. The invention solves the problems of insufficient rigidity and easy deformation of the measuring rod, low centering precision, inconvenient operation, difficult alignment and scratch of the surface of a workpiece in the measuring process caused by large measuring span of the existing large-sized outside micrometer, reduces measuring errors, improves the deformation resistance of the measuring rod, improves the centering precision and the operation convenience of measurement, and effectively improves the measuring precision and the stability of the large-sized outside micrometer in a large-sized workpiece measuring scene.

Inventors

NIU WEIXIANG
LI LUPING
ZHOU JIANJUN
PANG KE
HU JIAJIA
ZHOU XIANZHENG
WANG NANSHENG
ZHU HONGYAN

Assignees

上海阿为特精密机械股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260309

Claims (10)

1. A rapid and stable measurement device for a large outside micrometer, comprising: A support base detachably mounted on one end of the frame of the large outside micrometer, and Four support bars disposed equidistantly spaced about the center of the support base, the support bars having spherical heads disposed toward the other end of the frame, the heads of the support bars being configured to be extendable or retractable relative to the one end of the frame.
2. The rapid and stable measurement device for large outside micrometer according to claim 1, wherein the support base comprises a fixing portion detachably mounted on the one end of the micrometer frame and a support base body provided on the support base body allowing the measurement rod provided on the one end of the micrometer frame to pass through.
3. The rapid stability measurement device of a large outside micrometer according to claim 2, wherein the fixing portion has an inner surface that mates with an outer surface of the one end of the micrometer frame, a fixing threaded hole is provided in a side surface of the fixing portion, and a fixing screw is provided on the fixing threaded hole, the fixing screw being configured to be screwed into the fixing threaded hole and to abut against the outer surface of the one end of the micrometer frame.
4. The rapid and stable measurement device for large outside micrometer according to claim 2, wherein the center of the supporting seat body is provided with a through hole allowing the measurement rod provided on the one end of the micrometer frame to pass through.
5. The rapid and stable measurement device for large outside micrometer according to claim 4, wherein the support base body is provided with four slots around the center of the support base body, each support rod is arranged in the corresponding slot, the slot is provided with an opening facing the other end of the scale frame and a mounting hole arranged at the bottom of the slot, the tail of the support rod is provided with a connecting threaded hole, the mounting hole is provided with an adjusting screw, the adjusting screw is configured to be screwed into the connecting threaded hole through the mounting hole and connected with the support rod, and a spring is connected between the bottom of the slot and the tail of the support rod.
6. The rapid and stable measuring device for large outside micrometer according to claim 2, wherein the head of the supporting rod contacts the workpiece to be measured first in the measuring process, thereby performing the functions of auxiliary supporting and preventing the workpiece to be measured from being scratched.
7. The rapid stability measurement device of claim 2, wherein the support rod extends beyond the measurement rod when the head of the support rod is extended relative to the one end of the frame.
8. The rapid stability measurement device of claim 5, wherein the spring is at a natural length when the head of the support rod is not subject to external forces, the initial extension of the support rod exceeding the measurement rod.
9. The rapid stability measurement device of claim 8, wherein the adjustment screw is further configured to adjust the initial extension lengths of the four support rods to be uniform by adjusting a depth of threading into the connection threaded hole.
10. The rapid stability measurement device of claim 5, wherein when the head of the support rod contacts a workpiece to be measured, the tail of the support rod compresses the spring such that the support rod retracts inwardly along the slot, and each support rod is configured to retract individually a different distance.

Description

Quick and stable measuring device for large outside micrometer Technical Field The invention relates to the technical field of precise measuring instruments, in particular to a rapid and stable measuring device of a large-sized outside micrometer. Background Along with the development of the mechanical industry, precision machine tool equipment is widely applied, the application range of some large lathes is wider and wider, workpieces with diameters of more than 500mm are more and more, and a micrometer is used as a precision measuring tool, so that the precision machine tool equipment is widely applied to the fields of mechanical processing and the like by virtue of the high-precision characteristic of the precision machine tool equipment. The large outside micrometer (usually more than 500mm in measurement range) has large measurement span, insufficient rigidity of a measuring rod, difficult alignment during measurement, large measurement error and inconvenient operation. The workpiece shown in fig. 1 and 2 has a diameter of 550mm and a tolerance of 0.03mm, the accuracy of the product cannot be guaranteed when the caliper is used for measuring in a processing site, and the product is scratched easily when the conventional outside micrometer is used due to the weight and length of the outside micrometer and the measurement error is large, particularly when the aluminum piece is measured. Therefore, those skilled in the art have focused on developing a quick and stable measurement device for a large outside micrometer that facilitates alignment of the large outside micrometer without scratching the workpiece. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention aims to solve the technical problems of difficult sliding or difficult alignment, insufficient rigidity of the measuring rod and excessive measuring error when the large outside micrometer is used for alignment. In order to achieve the above object, the present invention provides a rapid and stable measuring device for a large outside micrometer, comprising: A support base detachably mounted on one end of the frame of the large outside micrometer, and Four support bars disposed equidistantly spaced about the center of the support base, the support bars having spherical heads disposed toward the other end of the frame, the heads of the support bars being configured to be extendable or retractable relative to the one end of the frame. Further, the supporting seat comprises a fixing part and a supporting seat body, the fixing part is detachably arranged at one end of the ruler frame, the supporting rod is arranged on the supporting seat body, and the supporting seat body allows a measuring rod arranged at one end of the ruler frame to pass through. Further, the fixing portion has an inner surface that mates with an outer surface of the one end of the scale frame, a fixing screw hole is provided in a side surface of the fixing portion, and a fixing screw is provided on the fixing screw hole, and the fixing screw is configured to be screwed into the fixing screw hole and to abut against the outer surface of the one end of the scale frame. Further, a through hole is formed in the center of the supporting seat body, and the through hole allows the measuring rod arranged on one end of the ruler frame to pass through. Further, the supporting seat body surrounds the center of the supporting seat body is provided with four slotted holes, each supporting rod is arranged in the corresponding slotted hole, the slotted holes are provided with openings facing the other end of the ruler frame and mounting holes arranged at the bottoms of the slotted holes, the tail parts of the supporting rods are provided with connecting threaded holes, the mounting holes are provided with adjusting screws, the adjusting screws are configured to be screwed into the connecting threaded holes through the mounting holes and are connected with the supporting rods, and springs are connected between the bottoms of the slotted holes and the tail parts of the supporting rods. Further, in the measuring process, the head of the supporting rod firstly contacts with the workpiece to be measured, so that the auxiliary supporting and the function of preventing the workpiece to be measured from being scratched are achieved. Further, when the head portion of the support rod is elongated with respect to the one end of the scale frame, the support rod extends beyond the measuring rod. Further, when the head of the support rod is not subjected to external force, the spring is in a natural length, and the initial extension length of the support rod exceeds the measuring rod. Further, the adjustment screw is further configured to adjust the initial protruding lengths of the four support rods to be uniform by adjusting a depth of screwing into the connection screw hole. Further, when the head of the support rod contacts a workpiece to be measured, the