CN211262076U - An inner diameter measuring device - Google Patents

Abstract

The utility model discloses an inner diameter measuring device, which can solve the problem that the prior art cannot measure the inner diameter of a flange workpiece and a box-type workpiece with a smaller opening and a larger inner diameter. The device has a simple structure and high measurement accuracy; the technical scheme is as follows: : Including the first measuring rod and the second measuring rod which are connected in rotation, one end of the first measuring rod and the second measuring rod is the measuring end, and the other end is the reading end; The single-point probe and the double-head probe are fixed on the reading end with a dial indicator and a meter adjustment seat corresponding to the dial indicator.

Description

An inner diameter measuring device

technical field

The utility model belongs to the field of hole component measurement, in particular to an inner diameter measurement device.

Background technique

In the machinery industry, vernier calipers and inner micrometers are often used in traditional hole diameter measurement to guide the processing of workpieces, measure the assembly accuracy of holes in the assembly, and correct the installation position. However, these two measuring instruments are limited by their own structures. , the scope of use is limited.

With the development of miniaturization and high-precision technology, the methods of measuring aperture at home and abroad can be divided into contact measurement and non-contact measurement. The contact measurement methods include coordinate machine measurement method and electrical contact method, and non-contact measurement method. There are optical method, pneumatic method. The coordinate machine measurement method is complicated to operate, and the measuring rod and the probe are prone to mechanical deformation due to the contact force, resulting in large measurement errors; the electrical contact method uses the contact between the probe and the hole wall to instantly energize the circuit for aiming measurement, and the measurement accuracy is low. ; The optical method is mostly used to measure the inner diameter of large holes, and the burrs and other defects on the end face of the hole will affect the measurement accuracy; the pneumatic method cannot measure the size and shape errors of any cross-section.

At the same time, the inventor found that for the inner diameter measurement of flange workpieces and box-type workpieces with small openings and large inner diameters, since the shaft hole is much smaller than the inner hole of the cavity, when measuring the inner hole of the cavity, the ordinary inner diameter is 100%. The sub-meter cannot be measured, and the three-jaw inner diameter dial indicator cannot be measured because it cannot extend into the box.

Utility model content

In view of the deficiencies in the prior art, the purpose of the present invention is to provide an inner diameter measuring device, which can solve the problem of inability to measure the inner diameter of flanged workpieces and box-like workpieces with smaller openings and larger inner diameters, and has a simple structure and high measurement efficiency. High precision.

In order to achieve the above object, the present invention is realized through the following technical solutions:

An embodiment of the present invention provides an inner diameter measuring device, comprising a first measuring rod and a second measuring rod that are rotatably connected, one end of the first measuring rod and the second measuring rod is a measuring end, and the other end is a reading end The measuring end is oppositely installed with a single-point measuring head and a double-head measuring rod for contacting with the inner wall of the workpiece, and the reading end is fixed with a dial indicator and a meter adjustment seat corresponding to the dial indicator.

Further, the single-point probe has one probe, and the double-end probe has two probes; the symmetry lines of the two probes of the double-end probe are perpendicular to the axis of the single-point probe and are on the same plane.

Further, the probe is a spherical probe or a hemispherical probe.

Further, the first measuring rod and the second measuring rod are respectively special-shaped structures, and after the two are installed, they form a symmetrical structure with respect to the horizontal line.

Further, the dial indicator is vertically fixed with the first measuring rod, the meter adjusting seat is connected with the second measuring rod, and the height of the adjusting meter seat is adjustable.

Further, a limit rod connected to the second measuring rod is provided on one side of the meter adjustment base.

Further, the height of the limit rod is greater than the maximum height of the meter seat.

Further, the opposite sides of the first measuring rod and the second measuring rod are respectively provided with grooves.

Further, the first measuring rod and the second measuring rod are connected by a pin at a set length position.

The measuring principle of the inner diameter measuring device is:

Pre-process the standard parts with the same size as the inner wall hole of the workpiece to be measured, select the appropriate single-point probe and double-head probe; adjust the first and second measuring rods to the horizontal state; use the standard parts to adjust the dial indicator Zero position, adjust the meter seat to the set height, so that the pointer of the dial indicator stops at the zero position;

When measuring the workpiece, a rubber band is installed on the reading ends of the first measuring rod and the second measuring rod, and the first measuring rod and the second measuring rod are rotated under the tension of the rubber band; the measurement of the first measuring rod and the second measuring rod When the ends are opened, the double-headed probe and the single-point probe are in close contact with the inner hole wall of the workpiece; the numerical change of the dial indicator is the size difference between the workpiece and the standard part.

The beneficial effects of the above-mentioned embodiments of the present utility model are as follows:

(1) One or more embodiments of the present invention can synchronously reflect the change of the probe to the reading end located outside the workpiece through the cooperation of the first measuring rod, the second measuring rod and the dial indicator. The change of the table value realizes the measurement of the inner diameter, and the measurement efficiency is high;

(2) When measuring in one or more embodiments of the present invention, the probe and the inner wall of the workpiece to be measured achieve point contact, reducing the measurement error caused when the inner wall is a curved surface, and the measurement accuracy is high;

(3) One or more embodiments of the present invention are simple in structure, easy to operate, and easy to assemble and disassemble; according to the size of the inner diameter, a measuring head with a suitable size can be selected and replaced, and the measuring range is wide.

Description of drawings

The accompanying drawings, which constitute a part of the present invention, are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

1 is a schematic structural diagram of the present invention according to one or more embodiments;

2 is a side view of the present invention in use according to one or more embodiments;

3 is a front view of the present utility model in use according to one or more embodiments;

Among them, 1, dial indicator, 2, first measuring rod, 3, rubber band, 4, limit rod, 5, meter adjustment seat, 6, second measuring rod, 7, pin shaft, 8, double-ended measuring rod , 9, single-point probe, 10, box cover, 11, box, 12, groove.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that the presence of features, steps, operations, devices, components and/or combinations thereof;

For the convenience of description, if the words "up", "down", "left" and "right" appear in this application, it only means that the directions of up, down, left and right are consistent with the drawings themselves, and do not limit the structure. It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

Terminology explanation part: Terms such as "installation", "connection", "connection", "fixation" in this application should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated; It is a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between the two elements. The specific meaning of the new type.

Example 1:

This embodiment provides an inner diameter measuring device, as shown in FIG. 1 , including a dial indicator 1 , a first measuring rod 2 , a second measuring rod 6 , a meter adjusting seat 5 , a limit rod 4 , and a double-ended measuring rod 8 and a single-point probe 9, wherein one end of the first measuring rod 2 and the second measuring rod 6 is the measuring end, and the other end is the reading end. The first measuring rod 2 and the second measuring rod 6 are rotatably connected, the dial indicator 1 and the meter seat 5 are installed on the reading ends of the first measuring rod 2 and the second measuring rod 6, and the double-ended measuring rod 8 and the single point The measuring head 9 is installed on the measuring ends of the first measuring rod 2 and the second measuring rod 6 .

In this embodiment, the first measuring rod 2 and the second measuring rod 6 are connected by a pin shaft 7 at a set length position, and the first measuring rod 2 and the second measuring rod 6 can rotate around the pin shaft 7 . The position of the connection point of the first measuring rod 2 and the second measuring rod 6 is determined according to the weight of the components installed on the measuring end and the reading end. The installation position of the pin shaft 7 should keep the measuring end and the reading end in balance. According to the inner diameter of the workpiece to be measured, you can choose to replace the double-point probe 8 and the single-point probe 9 with suitable size, and the measurement range is wide.

The first measuring rod 2 and the second measuring rod 6 are respectively special-shaped structures, and after they are installed, they form a symmetrical structure about the horizontal line. In this embodiment, the first measuring rod 2 is sequentially provided with a first horizontal section, a first inclined section, a second horizontal section, a second inclined section and a third horizontal section from the measuring end to the reading end, and the first inclined section The segment slopes downward, and the second slope slopes upward. The second measuring rod 6 is provided with a fourth horizontal section, a third inclined section, a fifth horizontal section, a fourth inclined section and a sixth horizontal section in sequence from the measuring end to the reading end, wherein the third inclined section is inclined upward, and the fourth inclined section is inclined upward. The segment slopes downward.

In the initial state (unused state), the second horizontal section and the fifth horizontal section are parallel to each other, the first inclined section and the third inclined section are symmetrically arranged with respect to the second horizontal section and the fifth horizontal section, and the second inclined section and the fourth horizontal section are arranged symmetrically. The inclined sections are symmetrically arranged with respect to the second horizontal section and the fifth horizontal section. And the included angle between the first inclined section and the third inclined section is smaller than the included angle between the second inclined section and the fourth inclined section. By setting the first inclined section and the third inclined section, a measurement space is formed between the first horizontal section and the fourth horizontal section; by setting the second inclined section and the fourth inclined section, the third horizontal section and the sixth horizontal section are formed. The adjustment space of the dial indicator 1 is formed between them.

It can be understood that, in other embodiments, the first measuring rod 2 and the second measuring rod 6 may also be other special-shaped structures, as long as a measurement space is formed at one end and an adjustment space is formed at the other end.

The single-point measuring head 9 is vertically fixed to the first horizontal section of the first measuring rod 2 , and the single-point measuring head 9 and the first measuring rod 2 may be connected by threads, bolts or other connection methods. In this embodiment, the single-point probe 9 includes a spherical probe and a probe body integrally connected with the spherical probe, and the spherical probe is located outside the first measuring rod 2 . It can be understood that, in other embodiments, the probe of the single-point probe 9 may also be a hemispherical probe. In this embodiment, the probe body is a cylinder. It can be understood that in other embodiments, the main body of the probe may also be a cuboid or other structures, as long as it can support the spherical probe.

The double-ended measuring rod 8 is fixed to the fourth horizontal section of the second measuring rod 6 , and the double-ended measuring rod 8 and the second measuring rod 6 may be connected by threads, bolts or other connection methods. In this embodiment, the double-ended probe 8 has two spherical probes and a T-shaped body, and two ends of the T-shaped body are respectively fixed with a spherical probe. The spherical probe is fixed to the outside of the second measuring rod 6 . By setting a spherical probe, it can form point contact with the inner wall of the workpiece during measurement, so as to reduce the measurement error caused when the inner wall is a curved surface. It can be understood that, in other embodiments, the measuring head of the double-ended measuring rod 8 can also be a hemispherical measuring head. In this embodiment, the T-shaped main body is composed of mutually perpendicular round rods. It can be understood that, in other embodiments, the T-shaped main body may also be composed of square rods that are perpendicular to each other.

The line of symmetry of the two spherical probes of the double-ended probe 8 is perpendicular to the axis of the single-point probe 9, and is on the same plane, that is, the axis of the single-point probe 9 vertically bisects the symmetry line of the two spherical probes.

The dial indicator 1 passes through and is fixed to the third horizontal section of the first measuring rod 2 , and the reading end of the dial indicator 1 is located outside the first measuring rod 2 . The upper surface of the sixth horizontal section of the second measuring rod 6 (the side close to the first measuring rod 2 ) is provided with a meter adjustment seat 5 , and the meter adjustment seat 5 is perpendicular to the sixth horizontal section. In this embodiment, one end of the adjustment meter 5 is threadedly connected with the first measuring rod 2 to facilitate the adjustment of the height of the meter adjustment base 5 . The adjustment base 5 can adjust the range by adjusting how much the dial indicator 1 stretches.

A limit rod 4 fixed vertically to the sixth horizontal section is provided on one side of the meter adjustment base 5 , and the height of the limit rod 4 is greater than the maximum height of the meter adjustment base 5 . By setting the limit rod 4 to prevent the dial indicator 1 from being damaged and malfunctioning due to excessive compression of the dial head of the dial indicator 1.

The upper surface of the third horizontal section of the first measuring rod 2 is provided with a groove 12 near the end position, and the lower surface of the sixth horizontal section of the second measuring rod 6 is provided with a groove 12 near the end position, and two concave grooves 12 are formed. The positions of the grooves 12 correspond. The grooves 12 are opened along the width direction of the first measuring rod 2 and the second measuring rod 6 for clipping the rubber band 3 in use, so that the angles of the first measuring rod 2 and the second measuring rod 6 can be changed.

This embodiment can realize the inner diameter measurement of flange workpieces and box-like workpieces with smaller openings and larger inner diameters, with simple structure and high measurement accuracy.

The inner diameter measurement device of the present embodiment adopts the relative measurement method, and the specific measurement process is:

Before measuring, process a standard part with the same size as the hole to be measured, and select the appropriate single-point probe 9 and double-end probe 8. When adjusting, first ensure that the included angle between the second horizontal section of the first measuring rod 2 and the fifth horizontal section of the second measuring rod 6 is zero, and the symmetry line of the two spherical probes of the double-ended measuring rod 8 and the single point The axis of the probe 9 is vertical and in the same plane.

Then use the standard parts to adjust the zero position of the dial indicator 1, and adjust the height of the adjustment base 5 appropriately, so that the pointer of the dial indicator 1 stops at the zero position. According to the three-point circle principle, three contacts can determine the diameter of the circle.

When actually measuring the inner diameter of the workpiece, as shown in FIGS. 2 and 3 , the workpiece includes a box body 11 and a box cover 10 , and an inner hole wall is formed between the box body 11 and the box cover 10 . A rubber band 3 is installed in the reading end grooves 12 of the first measuring rod 2 and the second measuring rod 6 , and the first measuring rod 2 and the second measuring rod 6 rotate around the pin shaft 7 under the pulling force of the rubber band 3 . The measuring ends of the first measuring rod 2 and the second measuring rod 6 are opened, and the two spherical probes and the single-point probe 9 of the double-ended measuring rod 8 will closely contact the inner hole wall of the workpiece. The numerical change of the dial indicator 1 is the dimensional difference between the workpiece and the standard part. As long as this difference is within the tolerance range of the inner hole, the inner diameter of the measured workpiece can be guaranteed to be qualified.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (9)

1. An inner diameter measuring device is characterized by comprising a first measuring rod and a second measuring rod which are rotatably connected, wherein one end of the first measuring rod and one end of the second measuring rod are measuring ends, and the other end of the first measuring rod and the other end of the second measuring rod are reading ends; the measuring end is oppositely provided with a single-point measuring head and a double-end measuring rod which are used for contacting with the inner wall of the workpiece, and the reading end is fixed with a dial indicator and a dial indicator seat corresponding to the dial indicator.

2. An inside diameter measuring device according to claim 1, wherein the single point stylus has one stylus and the double head stylus has two styli; the symmetrical lines of the two measuring heads of the double-head measuring rod are perpendicular to the axis of the single-point measuring head and are on the same plane.

3. An inner diameter measuring device according to claim 2, wherein the probe is a spherical probe or a hemispherical probe.

4. An inner diameter measuring device according to claim 1, wherein the first measuring rod and the second measuring rod are respectively of a special-shaped structure, and are arranged to form a symmetrical structure about a horizontal line.

5. The inner diameter measuring device as claimed in claim 1, wherein the dial indicator is fixed vertically to the first measuring rod, the dial seat is connected to the second measuring rod, and the height of the dial seat is adjustable.

6. An inner diameter measuring device according to claim 1 or 5, wherein a limit rod connected to the second measuring rod is provided at one side of the dial seat.

7. An inner diameter measuring device according to claim 6, wherein the height of the limiting rod is greater than the maximum height of the dial seat.

8. The inner diameter measuring device as claimed in claim 1, wherein the first measuring rod and the second measuring rod are respectively provided with a groove at opposite sides.

9. An inner diameter measuring device according to claim 1, wherein the first measuring rod and the second measuring rod are connected by a pin at a predetermined length position.

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