CN209745147U

CN209745147U - Three-point type outside micrometer

Info

Publication number: CN209745147U
Application number: CN201920805214.4U
Authority: CN
Inventors: 徐晗晟
Original assignee: Jiangsu Salt Measuring Tool Technology Co Ltd
Current assignee: Jiangsu Salt Measuring Tool Technology Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2019-12-06
Anticipated expiration: 2029-05-30

Abstract

The utility model discloses a three-point outside micrometer, which comprises a first differential head, a micrometer frame, an auxiliary device and a positioning device; the first differential head, the auxiliary device and the positioning device are respectively connected with the ruler frame, and the micrometer screw of the first differential head is opposite to the positioning device; the first differential head, the auxiliary device and the positioning device can form three-point positioning for the workpiece to be measured. The outside micrometer can accurately measure the diameter of the outer circle of a workpiece at one time.

Description

Three-point type outside micrometer

Technical Field

The utility model belongs to the measuring tool field particularly, relates to an external micrometer.

Background

An outside micrometer, also called a micrometer caliper, is a measuring tool used for measuring the outside diameter or thickness of an object. At present, an outside micrometer is often used for workpieces with higher precision requirements when measuring objects. However, when measuring the outer diameter of an object, there are two problems in the prior art: (1) when the existing outside micrometer is used for measuring a workpiece, only two points are contacted with the excircle of the workpiece, but the measurement difficulty is increased along with the increase of the outside diameter of the workpiece. During the measurement, the two points are sometimes not on the diameter of the workpiece, resulting in a measured value that is smaller than the actual value of the workpiece. In particular, workpieces having a relatively large outer diameter are often measured at different values. This wastes time and is inefficient. If the measurement is wrong, the workpiece is scrapped, and the loss is larger. (2) At present, the outer micrometer is adjusted to zero by using a semicircular wrench to adjust a fixed sleeve. When adjusting, the small fixing bolt is loosened, then the fixing sleeve is adjusted to zero by the semicircular wrench, and then the small fixing bolt is fixed. The bolt is small, the tool is small, the operation is not good, the bolt is sometimes inaccurate, and the operation is troublesome.

Disclosure of Invention

The technical problem is as follows: the utility model discloses the technical problem that will solve is: the three-point outside micrometer can accurately measure the diameter of the outer circle of a workpiece at one time.

The technical scheme is as follows: in order to solve the technical problem, the embodiment of the utility model provides an adopt following technical scheme:

A three-point outside micrometer comprises a first micrometer head, a micrometer frame, an auxiliary device and a positioning device; the first differential head, the auxiliary device and the positioning device are respectively connected with the ruler frame, and the micrometer screw of the first differential head is opposite to the positioning device; the first differential head, the auxiliary device and the positioning device can form three-point positioning for the workpiece to be measured.

As a preferred example, the auxiliary device comprises a mark post and a locking device; a through hole is formed in the ruler frame, the marker post is positioned in the through hole, and two ends of the marker post are positioned outside the through hole; the locking device is connected to the surface of the ruler frame and can lock the mark post; the surface of the mark post is marked with scales.

As a preferable example, the auxiliary device further includes a measurement positioning portion, the measurement positioning portion is fixedly connected to the measurement end of the pole, and the measurement positioning portion and the pole are vertically arranged.

As a preferred example, the auxiliary device further comprises a hook flat key, a key groove is formed in the ruler frame, the hook flat key is located in the key groove, the surface of the mark post is in contact with the surface of the hook flat key, and the locking device locks the mark post by applying force to the hook flat key.

Preferably, the auxiliary device further comprises an end cover, and the end cover is fixed at the outer end of the through hole of the ruler frame.

As a preferred example, the auxiliary device further includes a limiting member, and the limiting member is fixedly connected to the free end of the post.

Preferably, the positioning device is an anvil.

Preferably, the positioning device is a second differential head, and the micrometer screw of the second differential head is opposite to the micrometer screw of the first differential head.

Preferably, the distance from the auxiliary device to the axis of the micrometer screw of the first micrometer head is a, the radius of the workpiece to be measured is r, the length or the diameter of the bottom surface of the micrometer screw is L1, and the length or the diameter of the contact part between the positioning device and the workpiece to be measured is L2; if L1 is more than or equal to L2, then r-L2/2 is more than or equal to a and less than or equal to r + L2/2 during measurement; if L1 < L2, then r-L1/2. ltoreq. a.ltoreq.r + L1/2 is measured.

Has the advantages that: compared with the prior art, the utility model discloses three-point type outside micrometer, the excircle diameter of once only accurate measurement work piece can. The utility model discloses a bikini external micrometer, including first differential head, chi frame, auxiliary device and positioner. The first differential head, the auxiliary device and the positioning device are respectively connected with the ruler frame, and the micrometer screw of the first differential head is opposite to the positioning device. The first differential head, the auxiliary device and the positioning device can form three-point positioning for the workpiece to be measured. When the three-point type outside micrometer is used for measurement, the diameter of a workpiece to be measured is estimated firstly, then the auxiliary device is adjusted to enable the auxiliary device to be located at a proper position, finally the workpiece to be measured is placed between the first micrometer head and the positioning device, and the micrometer screw rod of the first micrometer head is adjusted to enable the workpiece to be measured to be in contact with the micrometer screw rod of the first micrometer head, the positioning device and the auxiliary device simultaneously. And reading the reading of the first differential head to obtain the diameter of the workpiece to be measured. Three-point positioning is realized, and the diameter of the workpiece to be measured can be accurately read by one-time measurement.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is another schematic structural diagram of the embodiment of the present invention;

FIG. 3 is a schematic view of the structure of the ruler frame according to the embodiment of the present invention;

Fig. 4 is a schematic diagram of the position of the marker post of the auxiliary device according to the embodiment of the present invention, which can be deviated from left to right.

the figure shows that: the measuring device comprises a first differential head 1, a ruler frame 2, an auxiliary device 3, a mark post 301, a locking device 302, a measuring and positioning part 303, a hook head flat key 304, an end cover 305, a limiting part 306, a positioning device 4, a measuring anvil 401, a second differential head 402 and a workpiece 5 to be measured.

Detailed Description

The technical solution of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the three-point outside micrometer according to the embodiment of the present invention includes a first micrometer head 1, a micrometer frame 2, an auxiliary device 3, and a positioning device 4. The first differential head 1, the auxiliary device 3 and the positioning device 4 are respectively connected with the ruler frame 2, and the micrometer screw of the first differential head 1 is opposite to the positioning device 4. The first differential head 1, the auxiliary device 3 and the positioning device 4 can form three-point positioning on the workpiece 5 to be measured.

When the three-point outside micrometer is used for measurement, the diameter of the workpiece 5 to be measured is estimated, for example, the workpiece 5 to be measured is measured by a vernier caliper to obtain an estimated value, then the auxiliary device 3 is adjusted to enable the auxiliary device 3 to be located at a proper position, finally the workpiece 5 to be measured is placed between the first differential head 1 and the positioning device 4, and the micrometer screw of the first differential head 1 is adjusted to enable the workpiece 5 to be measured to be simultaneously contacted with the micrometer screw of the first differential head 1, the positioning device 4 and the auxiliary device 3. And reading the reading of the first differential head 1 to obtain the diameter of the workpiece to be measured.

The outside micrometer of the embodiment realizes accurate measurement of the outside diameter of the workpiece 5 to be measured by three-point positioning of the workpiece 5 to be measured. The measurement process can be completed once without repeating for many times. Compared with the prior art, the three-point type outside micrometer of the embodiment greatly improves the measurement precision and the measurement efficiency.

As a preferred example, the auxiliary device 3 comprises a post 301 and a locking device 302. The ruler frame 2 is provided with a through hole, and the marker post 301 is positioned in the through hole. The post 301 is movable in the through hole. The two ends of the post 301 are located outside the through hole. The locking device 302 is connected to the surface of the ruler frame 2, and the locking device 302 can lock the mark post 301. When the post 301 is moved into position, the post 301 is locked with the locking device 302. The locking device 302 can be the same as the locking device in the micrometer in the prior art, as long as the mark post can be locked. The surface of the post 301 is marked with a scale. The auxiliary device 3 is a base point for three-point positioning of the outside micrometer to the workpiece 5 to be measured in the embodiment. In the prior art, when a workpiece 5 to be measured is measured, only two base points, namely an anvil and a differential head 1, are provided. In the preferred embodiment, the auxiliary device 3 is added, and the mark post 301 is used as a third base point to participate in the measurement of the outer diameter of the workpiece 5 to be measured. The mark post 301 is marked with scales which can be used as the diameter of the workpiece 5 to be measured. For example, as shown in fig. 1, if the diameter of the workpiece 5 to be measured is predicted to be 40mm by a vernier caliper, the scale 301 is adjusted so that the scale 40mm of the scale 301 is opposite to the inner side edge of the scale frame 2.

In order to ensure the accuracy of the measurement, as a preferable example, the auxiliary device 3 further includes a measurement positioning portion 303, the measurement positioning portion 303 is fixedly connected with the measurement end of the post 301, and the measurement positioning portion 303 and the post 301 are vertically arranged. The measurement positioning portion 303 is in contact with the workpiece 5 to be measured. The measurement positioning portion 303 and the target 301 are vertically arranged. When the post 301 is horizontal, the measurement positioning portion 303 is in a vertical state.

as an example, the center of the through hole, the hole distance from the measurement maximum workpiece diameter center is shifted downward by 5mm, and the measurement surface design length of the measurement positioning portion 303 is 20 mm. Taking an outside micrometer with a measuring range of 25-50 as an example: the two can measure any size within the range of 25-50 mm when combined.

Preferably, the auxiliary device 3 further comprises a hook flat key 304, and the ruler frame 2 is provided with a key slot therein. The hook flat key 304 is located in the key slot, the surface of the target 301 is in contact with the surface of the hook flat key 304, and the locking device 302 locks the target 301 by applying force to the hook flat key 304. As shown in figure 3, the ruler frame 2 is provided with a through hole in the middle and a key slot on the side, and the mark post 301 is inserted into the hole. The plane of the mark rod 301 marked with scales is opposite to the plane of the key groove, then the hook flat key 304 is placed in the key groove, the hook faces the outer side of the ruler frame 2, the end cover 305 is fixed on the ruler frame 2 through a screw, then the handle of the locking device 302 is rotated, the hook flat key 304 and the mark rod 301 are pressed tightly through the screw, and the parallelism of the micrometer screw of the measuring and positioning part 303 and the first micrometer head 1 is ensured.

Preferably, the auxiliary device 3 further comprises an end cap 305, the end cap 305 is fixed on the outer end of the through hole of the ruler frame 2, and the end cap 305 faces the free end of the post 301. The end cap 305 is provided to position the hook flat key 304 in order to prevent the hook flat key 304 from moving out of the through slot during movement.

Preferably, the auxiliary device 3 further includes a limiting member 306, and the limiting member 306 is fixedly connected to the free end of the post 301. One end of the marker post 301 connected with the measurement positioning part 303 is a measurement end, and the other end is a free end. The limiting member 306 is fixedly connected with the free end of the post 301. By pulling the stopper 306, the movement of the post 301 in the through slot is realized.

As a preferred example, the positioning device 4 is an anvil 401. During measurement, the measuring anvil is contacted with the workpiece 5 to be measured. The anvil is a base point which is in contact with the workpiece 5 to be measured.

As a preferable example, when measuring, the distance from the auxiliary device 3 to the axis of the micrometer screw of the first micrometer head 1 is a, the radius of the workpiece to be measured is r, the length or diameter of the bottom surface of the micrometer screw is L1, and the length or diameter of the contact part between the positioning device 4 and the workpiece to be measured is L2; if L1 is more than or equal to L2, then r-L2/2 is more than or equal to a and less than or equal to r + L2/2; if L1 < L2, then r-L1/2. ltoreq. a. ltoreq.r + L1/2. If the positioning device 4 is an anvil, the length of the anvil top surface is L2. If the positioning device is a second differential head, the diameter of the micrometer screw of the second differential head is L1. This arrangement ensures that the two end points of the maximum diameter of the workpiece 5 to be measured are located on the positioning device and the auxiliary device. When the auxiliary device 3 of the above embodiment is used, the distance from the auxiliary device 3 to the axis of the micrometer screw of the first micrometer head 1 is a, which means the distance from the top of the measurement positioning part 303 of the auxiliary device 3 to the axis of the micrometer screw of the first micrometer head 1 is a.

In the micrometer of the above embodiment, when measuring the outer diameter of the workpiece, the dimension 3mm of the mark post 301 in the direction perpendicular to the micrometer screw of the first micrometer head 1 is adjusted based on the approximate dimension of the outer diameter of the workpiece 5 to be measured (which can be measured by a vernier caliper) and the side of the micrometer frame. As an example, as shown in fig. 4, the workpiece 5 to be measured may be deviated to the left to the position 5-2 in fig. 4, 3mm from the center of the micrometer screw of the first micrometer head 1; the position 5-3 in the figure 4 can be deviated to the right, and the distance is 3mm from the center of the micrometer screw rod 1 of the first micrometer head, as long as the distance is not more than +/-3 mm. This always ensures that the end faces of the micrometer screw of the first differential head 1 and of the positioning device 4 (i.e. the anvil or the second differential head) are at the maximum diameter of the workpiece 5 to be measured. When the workpiece 5 to be measured is located at the 5-1 position in fig. 4, it means that the workpiece 5 to be measured is located at the middle position without being shifted leftward or rightward. The reason why +/-3 mm is selected is that the diameter of the existing commonly used micrometer screw is 6.5mm, the unilateral error of the size adjustment of the marker post 301 only needs to be no more than 3.25mm of the radius of the micrometer screw, and 3mm is selected in the example. During measurement, the measuring surface of the measuring positioning part 303 on the mark post 301 and the end surface of the positioning device 4 (namely, the measuring anvil or the second differential head) are contacted with the excircle of the workpiece, and the end surface of the micrometer screw on the first differential head 1 is rotated to the excircle of the workpiece. This can once only accurately measure the excircle diameter of work piece.

As an example, the main scale of the target 301 is 0.5mm per cell, but the outer diameter of the workpiece changes by 1mm per cell for each cell moved by the target 301 on the side where the workpiece is measured, so moving one cell on the main scale of the target 301 represents moving 1 mm. The opposite surface of the middle of each adjacent two scale marks of each grid of the main scale is additionally provided with a scale mark, each grid of the main scale is divided into two small grids, and each small grid is moved to show that the change of the outer diameter of the workpiece is 0.5mm, which is the same as the reading method of the main scale of the first differential head 1.

The main scale of the marker post 301 is marked based on the side of the micrometer screw of the first micrometer head 1 and the inner side of the scale frame 2. Because the diameter of the micrometer screw of the first micrometer head 1 is normally 6.5mm, the micrometer screw of the first micrometer head 1 is rotated to the minimum value, and then the target 301 is moved, so that the measuring surface of the measuring and positioning part 303 of the target 301 is in parallel contact with the side surface of the micrometer screw of the first micrometer head 1, and at this time, the main scale of the target 301 is designed to be 6.5 scales by taking the inner side surface of the scale frame 3 as a reference.

Such as: as shown in fig. 4, when a workpiece on the left and right sides of the workpiece is measured, the locking device 302 of the auxiliary device 3 is firstly loosened, the scale of the adjusting mark post 301 is 40 (the adjustment error size can be checked, since the diameter of the micrometer screw is 6.5mm, as long as the size adjustment unilateral error of the mark post does not exceed 3.25mm of the radius of the micrometer screw), then the locking device 302 of the auxiliary device 3 is locked, and the measuring surfaces of the positioning device 4 and the measuring positioning part 303 are contacted with the outer diameter of the workpiece to be measured; and rotating the first differential head 1 to enable the end face of the micrometer screw of the first differential head 1 to contact the outer surface of the workpiece to be measured. Therefore, the outer surface of the workpiece to be measured is contacted at three points, and the outer diameter of the workpiece to be measured can be accurately measured at one time.

Preferably, the positioning device 4 is a second differential head 402, and the micrometer screw of the second differential head 402 is opposite to the micrometer screw of the first differential head 1. The second differentiating head 402 is provided to perform a zeroing function in addition to a function as a measurement base point. The second differential head 402 has the same structure as the first differential head 1. The second differential head 402 may have a size smaller than that of the first differential head 1. The second differential head 402 includes a micrometer screw, a fixed sleeve, a micro-cylinder, a force measuring device, and a locking device. In the preferred embodiment, the zeroing process is as follows: firstly, rotating the micrometer screw rod on the first micrometer head 1 to the minimum scale and carrying out zero alignment, then locking the locking device of the first micrometer head 1, then placing a calibration rod of a universal micrometer between the end surface of the micrometer screw rod on the first micrometer head 1 and the end surface of the micrometer screw rod of the second micrometer head 402, and then rotating the force measuring device of the second micrometer head 402; when the rotation reaches the minimum value, the locking device of the second differential head 402 is locked, then the locking device of the first differential head 1 is loosened, the micrometer screw of the first differential head 1 is rotated, and the calibration rod is withdrawn. Thus, the micrometer zeroing is completed. The method has the advantages that the zero alignment mode of the micrometer is rapid, convenient and accurate.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. The three-point type outside micrometer is characterized by comprising a first micrometer head (1), a micrometer frame (2), an auxiliary device (3) and a positioning device (4); wherein the content of the first and second substances,

The first differential head (1), the auxiliary device (3) and the positioning device (4) are respectively connected with the ruler frame (2), and a micrometer screw of the first differential head (1) is opposite to the positioning device (4); the first differential head (1), the auxiliary device (3) and the positioning device (4) can be used for forming three-point positioning on the workpiece (5) to be measured.

2. the three-point micrometer according to claim 1, wherein the auxiliary device (3) comprises a post (301), a locking device (302); a through hole is formed in the ruler frame (2), the marker post (301) is positioned in the through hole, and two ends of the marker post (301) are positioned outside the through hole; the locking device (302) is connected to the surface of the ruler frame (2), and the locking device (302) can lock the mark post (301); the surface of the mark post (301) is marked with scales.

3. The three-point micrometer according to claim 2, wherein the auxiliary device (3) further comprises a measurement positioning portion (303), the measurement positioning portion (303) is fixedly connected to the measurement end of the post (301), and the measurement positioning portion (303) and the post (301) are arranged perpendicularly.

4. The three-point micrometer according to claim 2, wherein the auxiliary device (3) further comprises a hook key (304), a keyway is provided in the frame (2), the hook key (304) is located in the keyway, a surface of the post (301) is in contact with a surface of the hook key (304), and the locking device (302) locks the post (301) by applying a force to the hook key (304).

5. The three-point micrometer according to claim 4, wherein the auxiliary device (3) further comprises an end cap (305), and the end cap (305) is fixed to the outer end of the through hole of the scale frame (2).

6. the three-point micrometer according to claim 2, wherein the auxiliary device (3) further comprises a stopper (306), and the stopper (306) is fixedly connected to the free end of the post (301).

7. The three-point micrometer according to claim 1, wherein the positioning device (4) is an anvil (401).

8. The three-point micrometer according to claim 1, wherein the positioning device (4) is a second micrometer head (402), and the micrometer screw of the second micrometer head (402) is opposed to the micrometer screw of the first micrometer head (1).

9. The three-point outside micrometer according to claim 1, wherein the distance from the auxiliary device (3) to the axis of the micrometer screw of the first micrometer head (1) is a, the radius of the workpiece to be measured is r, the length or diameter of the bottom surface of the micrometer screw is L1, and the length or diameter of the contact portion between the positioning device (4) and the workpiece to be measured is L2; if L1 is more than or equal to L2, then r-L2/2 is more than or equal to a and less than or equal to r + L2/2 during measurement; if L1 < L2, then r-L1/2. ltoreq. a.ltoreq.r + L1/2 is measured.