CN113932688A - Hole inner diameter measuring device and measuring method - Google Patents

Hole inner diameter measuring device and measuring method Download PDF

Info

Publication number
CN113932688A
CN113932688A CN202111105049.XA CN202111105049A CN113932688A CN 113932688 A CN113932688 A CN 113932688A CN 202111105049 A CN202111105049 A CN 202111105049A CN 113932688 A CN113932688 A CN 113932688A
Authority
CN
China
Prior art keywords
measuring
hole
measured
wall
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202111105049.XA
Other languages
Chinese (zh)
Other versions
CN113932688B (en
Inventor
周力
韩利亚
陈代鑫
宿明
蔡怀阳
杨扬
韩雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Aircraft Industrial Group Co Ltd
Original Assignee
Chengdu Aircraft Industrial Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Aircraft Industrial Group Co Ltd filed Critical Chengdu Aircraft Industrial Group Co Ltd
Priority to CN202111105049.XA priority Critical patent/CN113932688B/en
Publication of CN113932688A publication Critical patent/CN113932688A/en
Application granted granted Critical
Publication of CN113932688B publication Critical patent/CN113932688B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/08Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
    • G01B5/12Measuring arrangements characterised by the use of mechanical techniques for measuring diameters internal diameters

Abstract

The invention discloses a hole inner diameter measuring device, which comprises a measuring front end and a measuring base arranged at the bottom end of the measuring front end; the measuring base is used for abutting against the inner wall of the hole to be measured when the inner diameter of the hole is measured, and the side wall of the measuring base is tangent to the inner wall of the hole to be measured of the inner wall of the hole to be measured; the measuring front end is perpendicular to the axis of the measuring base and comprises a measuring contact fixing rod, a telescopic rod and a display device, one end of the fixing rod is connected with the measuring base, the other end of the fixing rod is connected with one end of the telescopic rod, and the measuring contact is connected with the other end of the telescopic rod; the measuring contact is used for abutting against the inner wall of the measured hole when the inner diameter of the hole is measured and can slide along the inner wall of the measured hole when rotating around the axis of the measuring base, and a hole inner diameter measuring method is also disclosed; the invention has the advantages that the measuring method is very simple and convenient through the arranged hole diameter measuring device, the hole diameter can be measured without the experience of professional technicians, and meanwhile, the error caused by manual reading can be reduced through electronic reading.

Description

Hole inner diameter measuring device and measuring method
Technical Field
The invention relates to the technical field of aircraft part manufacturing, in particular to a hole inner diameter measuring device and a hole inner diameter measuring method.
Background
In the manufacturing and assembly of airplanes, various hole machining is often involved, and once the machining size exceeds an error, the function of the connecting hole can be lost, particularly, the connecting hole for butting the large parts can reach more than 150mm in diameter, and the hole diameter precision grade is more than H9. After the components are assembled, the precision hole is mainly processed by boring, the processing position is generally positioned on the side surface of the large-scale components of the airplane, and the precision hole detection device has the characteristics of high position, large size, difficult positioning and the like, and brings huge challenges to the precision hole detection.
In the prior art, the aperture is mainly measured by a single inside micrometer, and the measurement error of the measurement method is large.
Disclosure of Invention
The invention provides a hole inner diameter measuring device and a measuring method aiming at the problem of large data error measured by the existing measuring device so as to realize accurate and stable measurement of the hole inner diameter, and the specific technical scheme is as follows:
a hole inner diameter measuring device comprises a measuring front end and a measuring base arranged at the bottom end of the measuring front end; wherein the content of the first and second substances,
the measuring base is a cylinder, the measuring base is used for abutting against the inner wall of the measured hole when the inner diameter of the hole is measured, and the side wall of the measuring base is tangent to the inner wall of the measured hole;
the measuring front end is perpendicular to the axis of the measuring base and comprises a measuring contact fixing rod, a telescopic rod and a display device, one end of the fixing rod is connected with the measuring base, the other end of the fixing rod is connected with one end of the telescopic rod, and the measuring contact is connected with the other end of the telescopic rod;
the measuring contact is used for abutting against the inner wall of the measured hole when the inner diameter of the hole is measured, and can slide along the inner wall of the measured hole when the measuring contact rotates around the axis of the measuring base;
the display device is used for displaying the contact state of the measuring base and the inner wall of the measured hole and displaying the measured numerical value.
Optionally, the display device includes an insulated wire and a display; wherein the content of the first and second substances,
the display is internally provided with a data processing module which is used for converting the received signals into digital signals;
a sensing module is arranged in the telescopic rod and is electrically connected with the data processing module;
the display device comprises a display lamp, one end of the insulated wire is connected with the measuring base, and the other end of the insulated wire is connected with the display lamp;
the sensing module is used for collecting measuring signals and transmitting the measuring signals to the data processing module, the data processing module processes the received measuring signals and transmits the processed measuring signals to the display, and the display is used for displaying the measuring data.
Optionally, the telescopic rod of the telescopic guide rod comprises a first connecting rod, a second connecting rod and a spring, a first mounting hole is formed in the lower end of the first connecting rod, the spring is wound at one end of the second connecting rod, one end of the spring is connected with the hole wall of the first mounting hole, and the other end of the spring is connected with the side wall of the second connecting rod;
the upper end of the fixed rod is provided with a second mounting hole, one end of the second connecting rod extends out of the first mounting hole and is inserted into the second mounting hole, and the second connecting rod is detachably connected with the second mounting hole.
Optionally, the measurement base includes a plurality of conductive segments and insulating segments, the conductive segments have the same diameter and are coaxially disposed, and every two conductive segments are connected through one insulating segment.
Optionally, the axial length of the insulating section is greater than 2 mm.
Optionally, the number of the conductive segments is 3;
the bottom end of the fixed rod is detachably connected with the side wall of the conductive section, which is positioned in the middle, through a bolt, a mounting groove is formed in the side wall of the conductive section, a threaded hole is formed in the bottom of the mounting groove, the end part of the fixed rod is inserted into the mounting groove of the conductive section, and the bolt penetrates through the threaded hole and then is in threaded connection with the end part of the fixed rod.
Optionally, the groove walls of the mounting groove are inclined towards the direction away from the groove hole.
Optionally, one end of the measuring contact, which is in contact with the measured hole, is spherical.
A hole inner diameter measuring method adopts the hole inner diameter measuring device, and comprises the following steps:
s1: adjusting the telescopic rod according to the estimated inner diameter D of the hole to be measured and the tolerance requirement +/-E so that the natural height of the measuring device is D + nE; wherein n is more than or equal to 10;
s2: placing a measuring device in the hole to be measured, so that the measuring base at the bottom end and the measuring contact at the top end are both in contact with the inner wall of the hole to be measured;
s3: adjusting the measuring base to enable the side wall of the measuring base to be tangent with the inner wall of the measured hole;
s4: rotating the measuring contact along the axis of the measuring base to obtain the minimum compression value M of the telescopic rod in the rotating process;
and S5, obtaining the measured inner diameter value d of the measured hole according to the M and the natural height of the measuring device.
Optionally, in S4, during the rotation of the measuring device around the axis of the measuring base, the rotation angle is not less than 30 degrees.
The invention has the following beneficial effects:
the embodiment of the invention provides a hole inner diameter measuring device which comprises a measuring front end and a measuring base arranged at the bottom end of the measuring front end, wherein the measuring base is a cylinder, the measuring base is abutted against the inner wall of a measured hole when the inner diameter of the hole is measured, and the side wall of the measuring base is tangent to the inner wall of the measured hole; the measuring front end is perpendicular to the axis of the measuring base and comprises a measuring contact, a fixed rod, a telescopic rod and a display device, one end of the fixed rod is connected with the measuring base, the other end of the fixed rod is connected with one end of the telescopic rod, and the measuring contact is connected with the other end of the telescopic rod; the measuring contact is used for abutting against the inner wall of the hole to be measured when the inner diameter of the hole is measured, and can slide along the inner wall of the hole to be measured when the measuring contact rotates around the axis of the measuring base; the display device is used for displaying the contact state of the measuring base and the inner wall of the measured hole and the measured numerical value. The device is connected with the measuring front end through the measuring base, the measuring base is arranged into a cylinder, the measuring base can be tangent to the inner wall of a measured hole in advance, the axis of the measuring front end is perpendicular to the axis of the measured hole, and subsequent measurement is facilitated; compare in traditional internal diameter measurement micrometer need rely on survey crew's experience to judge whether internal diameter measurement micrometer is perpendicular with the axis of being surveyed the hole, utilize the axis of the perpendicular axis of being surveyed the hole of the supplementary measurement front end of measurement base of cylinder shape, this kind of mode is more accurate, and the error is littleer.
Drawings
FIG. 1 is a schematic structural diagram of a hole inner diameter measuring device according to the present application;
FIG. 2 is a side view of the structure of FIG. 1;
FIG. 3 is a circuit diagram of a display lamp in an apparatus for measuring the inner diameter of a hole according to the present application;
reference numerals: 1. a measuring base; 11. a conductive segment; 12. an insulating section; 13. mounting grooves; 2. measuring a front end; 21. a telescopic rod; 211. a measuring probe; 212. a first connecting rod; 213. a first mounting hole; 22. a display; 221. a display lamp; 222. a measurement switch; 223. a display screen; 23. a spring; 24. a second connecting rod; 25. fixing the rod; 251. and a second mounting hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. While the components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations, the features of the embodiments and examples described below may be combined with each other without conflict. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.
Referring to fig. 1 and fig. 2, the present embodiment provides a hole inner diameter measuring device, which includes a measuring front end 2 and a measuring base 1 installed at the bottom end of the measuring front end 2; the measuring base 1 is a cylinder, the measuring base 1 abuts against the inner wall of the hole to be measured when the inner diameter of the hole is measured, and the side wall of the measuring base is tangent to the inner wall of the hole to be measured; the measuring front end 2 is perpendicular to the axis of the measuring base 1, the measuring front end 2 comprises a measuring contact 211, a fixing rod 25, an expansion link 21 and a display device, one end of the fixing rod 25 is connected with the measuring base 1, the other end of the fixing rod 25 is connected with one end of the expansion link 21, and the measuring contact 211 is connected with the other end of the expansion link 21; the measuring contact 211 is used for abutting against the inner wall of the measured hole when the inner diameter of the hole is measured, and can slide along the inner wall of the measured hole when rotating around the axis of the measuring base 1; the display device is used for displaying the contact state of the measuring base 1 and the inner wall of the measured hole and the measured numerical value.
As shown in fig. 1, the whole measuring base 1 is a cylindrical structure, before measuring the inner wall of the measured hole, the depth a of the measured hole needs to be measured, the length B of the measuring base 1 is selected according to the depth of the measured hole, B is not greater than a, the diameter D of the measured hole is estimated, and the natural height D + nE of the measuring device is selected according to the diameter D; during measurement, the measurement base 1 is required to be placed close to the inner wall of a measured hole, the excircle of the measurement base 1 is tangent to the inner wall of the measured hole, the measurement contact 211 abuts against the other side of the inner wall of the measured hole at the moment, the display device is started, the display device can display whether the measurement base 1 is tangent to the inner wall of the measured hole or not, the measurement base 1 is adjusted to be in a state of being tangent to the inner wall of the measured hole, the measurement front end 2 is rotated along the axis of the measurement base 1, in the rotating process, the display device can automatically record the minimum value of the compression amount of the telescopic rod in the rotating process, and the measured diameter d of the measured hole is obtained by subtracting the minimum value from the height of the measurement device in a natural state. Preferably, the angle of rotation of the measuring nose 2 to the left and to the right needs to be greater than 30 degrees to ensure that the range of compression of the telescopic rod 21 during rotation covers this minimum.
In the plane as shown in fig. 1, the axis of the measurement front end 2 and the axis of the measurement base may be arranged at any included angle, and it is only necessary that the measurement contact 211 abuts against the inner wall of the hole to be measured when the measurement base 1 is tangent to the inner wall of the hole to be measured. Preferably, in the plane shown in fig. 1, an included angle between the axis of the measurement front end 2 and the axis of the measurement base 1 is 90 degrees, if the included angle is set to be the remaining angle except 90 degrees, after the compression amount of the telescopic rod 21 is measured, the compression amount in the vertical direction of the measurement base is calculated by using the cosine law, and finally the compression amount in the vertical direction of the measurement base 1 is subtracted from the natural height of the measurement device to obtain the measured diameter d.
The device is connected with a measuring base 1 and a measuring front end 2, the measuring base 1 is arranged into a cylinder and can make the measuring base 1 tangent with the inner wall of a measured hole in advance, the axis of the measuring front end 2 is perpendicular to the axis of the measured hole, and the device is convenient for subsequent measurement and is also provided with a display device, the display device which is arranged in the measured hole of the measuring device can be used for judging whether the outer side of the measuring base 1 is tangent with the inner wall of the measured hole or not, after the measuring base 1 is tangent with the inner wall of the measured hole, the measuring front end 2 is only needed to be shifted by a person to make the measuring device rotate to a certain angle along the axis of the measuring base 1 left and right, the display device can automatically read the minimum value measured in the rotating process, the minimum value is the minimum compression quantity in the rotating process, the minimum value is subtracted as the actual measurement diameter d of the measured hole by the height of the measuring device in the natural state, and compared with the traditional inside diameter measurement micrometer, whether the inside diameter measurement micrometer is judged by the experience of the measuring person or not The axis of the measured hole is vertical, and the axis of the front end is measured to be vertical to the axis of the measured hole in an auxiliary mode by using the cylindrical measuring base, so that the mode is more accurate, and the error is smaller; meanwhile, the display device is used for measuring the stretching amount of the telescopic rod 21 to calculate the actual diameter d of the measured hole, the natural height of the measuring device is fixed, the measured error is compared with the manual reading of the micrometer, the measuring precision is higher, and the error is further reduced. As an alternative embodiment, the display device includes a display 22; the display 22 is internally provided with a data processing module, and the data processing module converts the received signals into digital signals; the telescopic link 21 internally mounted has sensing module, and sensing module is connected with the data processing module electricity, sensing module is used for gathering measured signal and transmits for the data processing module, the data processing module transmits the display 22 for after handling received measured signal, and display 22 shows measured data.
Referring to fig. 1, the telescopic rod 21 includes a first connecting rod 212, a second connecting rod 24 and a spring 23, a first mounting hole 213 is formed at a lower end of the first connecting rod 212, the spring 23 is wound at one end of the second connecting rod 24, one end of the spring 23 is connected to a hole wall of the first mounting hole 213, and the other end of the spring 23 is connected to a side wall of the second connecting rod 24; a second mounting hole 251 is formed in the upper end of the fixing rod 25, one end of the second connecting rod 24 extends out of the first mounting hole 213 and is inserted into the second mounting hole 251, and the second connecting rod 24 is detachably connected with the second mounting hole 251; specifically, in the first mode, the side walls of the second connecting rod 24 and the second mounting hole 251 are respectively provided with a snap ring and a snap groove which are matched with each other, and the second connecting rod 24 and the second mounting hole 251 are clamped with each other; in the second mode, the side walls of the second connecting rod 24 and the second mounting hole 251 are both provided with threads, and the second connecting rod 24 is in threaded connection with the second mounting hole 251.
The other connection modes of the telescopic rod 21 and the fixing rod 25 are not limited to the above-mentioned connection modes, for example, the upper end of the second connecting rod 24 is fixedly connected or clamped with the lower end of the first connecting rod 212, the lower end of the second connecting rod 24 is inserted into the blind hole formed at the upper end of the fixing rod 25, the spring 23 is further wound at the lower end of the second connecting rod 24, one end of the spring 23 is connected to the second connecting rod 24, the other end of the spring 23 is connected into the hole wall of the blind hole, and at this time, the gap between the end of the second connecting rod 24 and the blind hole is 0.02 mm.
The sensing module actually measures the compression force of the spring 23, so the sensing module can be a spring force sensor, the spring force sensor measures the compression force of the spring 23 and then transmits a signal to the data processing module, and the data processing module converts the received signal into a digital signal and displays the digital signal through the display device.
When in use, the height H of the measuring device larger than the diameter of the hole to be measured is selected, the height of the measuring device in the hole to be measured is between the height of the measuring device in the natural state and the range of subtracting the maximum compression amount of the spring 23 from the height of the measuring device in the natural state, when the measuring device is placed in the hole to be measured, the spring 23 needs to be in a compression state, the measuring contact 211 is abutted against the inner wall of the hole to be measured, the measuring base 1 is adjusted, after the outer side of the measuring base 1 is tangent to the inner wall of the hole to be measured, the measuring front end 2 is rotated around the axis of the measuring base 1, the measuring contact 211 can be always contacted with the inner wall of the hole to be measured through the elastic performance of the spring 23, the sensing module arranged on the measuring contact 211 transmits the contact signal collected by the sensing module to the data processing module, the data processing module converts the collected contact signal into a digital signal and transmits the digital signal to the display 22, and the minimum value in the measuring process is displayed through a display screen 223 on the display 22, the minimum value is the minimum compression amount of the spring 23, and the measured diameter d of the measured hole is obtained by subtracting the minimum value from the height of the measuring device in the natural state.
As an alternative embodiment, the measurement base 1 includes n +1 conductive segments 11 and n insulating segments 12, where the n conductive segments 11 have the same diameter and are coaxial, and every two conductive segments 11 are connected through one insulating segment 12.
The measuring device is divided into n +1 conductive segments and n insulating segments, and the display device is combined to display whether the measuring base 1 is tangent to the inner wall of the measured hole or not, so that the tangency between the side surface of the measuring base 1 and the inner wall of the measured hole is further ensured, and the condition that the measuring base 1 is not tangent due to the overlarge friction force between the measuring base 1 and the inner wall of the measured hole is avoided, and errors are caused on the subsequent measurement result of the diameter of the measured hole.
Each of the conductive segments is connected to a display device, which includes a display lamp 221, by an insulated wire.
Conductive segment 11 and insulating segment 12 are formed by solid glue, numerical control processing is carried out after the bonding is finished, coaxiality between all conductive segments 11 is less than 0.02, the surface of conductive segment 11 is in a smooth state at the moment, unnecessary errors generated in the measuring process are prevented, one end of each insulated wire is respectively connected with one conductive segment 11, the other end is converged towards the direction of a fixing rod 25, the measuring wire is prevented from interfering with the edge of a hole in the measuring process, and the insulated wires are converged in multiple modes at the moment, including but not limited to the converging mode of the following descriptions: firstly, the fixing rod 25, the second connecting rod 24 and the first connecting rod 212 are all arranged to be hollow and communicated with each other, and the collected insulated wires penetrate upwards through holes in the fixing rod 25, the second connecting rod 24 and the first connecting rod 212 and are connected with the display 22; one end of each insulated wire is connected with one conducting segment 11, and the other ends of the insulated wires are wound on the outer wall of the fixed rod 25 after being gathered, extend upwards to the display 22 and then are connected with the display 22; and the top ends of the insulated wires are directly converged at one side of the fixing rod, extend upwards and are directly connected with the display, and the third converging mode is preferred for facilitating the disassembly and the maintenance of the device.
The circuit diagram connected between the conductive segment and the display lamp is shown in fig. 3, and comprises an optical coupler O1, a power supply, an optical coupler O2, an and gate and a display lamp 221, first input ends of the optical coupler O1 and the optical coupler O2 are both connected with the positive electrode of the power supply, second input ends of the optical coupler O1 and the optical coupler O2 are respectively connected with the conductive segments at the left end and the right end through insulated wires, the negative electrode of the power supply is connected with the conductive segment at the middle part, fourth output ends of the optical coupler O1 and the optical coupler O2 are connected with each other and grounded, fourth input ends of the optical coupler O1 and the optical coupler O2 are respectively connected with two input ends of the and gate, after the output end of the and gate is connected with the display lamp 221, the other end of the display lamp 221 is grounded, when and only when the outputs of the two output ends of the and gate are both 1, the display lamp 221 displays green, or else, the display lamp displays red.
The measuring base comprises 3 conductive segments 11 for illustration, during measurement, the measuring device is placed inside a measured hole, and the position of the measuring base 1 is adjusted, so that the side surface of the measuring base 1 is tangent to the inner wall of the measured hole, and at the moment, whether the bottoms of the conductive segments 11 simultaneously reach the contact state with the inner wall of the measured hole or not is judged through the state of the display lamp 221, namely, the first state: the left end conductive segment 11 and the middle conductive segment 11 are in contact with the inner wall of the hole to be detected, the right end conductive segment 11 is not in contact with the inner wall of the hole to be detected, the optical coupler O1 is switched on, signals are transmitted to the first input end of the AND gate and output 1, the optical coupler O2 is not switched on, the output of the second input end of the AND gate is 0, and the display lamp 221 displays a red light; in the second state: the right end conductive segment 11 and the middle conductive segment 11 are in contact with the inner wall of the hole to be detected, the left end conductive segment 11 is not in contact with the inner wall of the hole to be detected, the optical coupler O2 is switched on, signals are transmitted to the second input end of the AND gate and output 1, the optical coupler O1 is not switched on, the output of the first input end of the AND gate is 0, and the display lamp 221 displays a red light; the third state: the right end conductive segment 11 and the right end conductive segment 11 are in contact with the inner wall of the detected hole, the middle conductive segment 11 is not in contact with the inner wall of the detected hole, the optical coupler O1 and the optical coupler O2 are not connected, the output of the two input ends of the AND gate is 0, and the display lamp 221 displays a red light; the fourth state: the three conductive segments 11 are all in contact with the inner wall of the tested hole, the optical coupler O1 and the optical coupler O2 are both switched on, the output of the two input ends of the AND gate is 1, and the display lamp 221 displays a green light.
In the manner, when there are 3 or more contact points between the measuring base 1 and the inner wall of the hole to be measured, it can be proved that the outer side of the measuring base 1 is tangent to the inner wall of the hole to be measured, because the axis of the measuring base 1 is parallel to the axis of the hole to be measured, the axis of the measuring front end 2 is perpendicular to the axis of the hole to be measured, and the contact state between the measuring base 1 and the inner wall of the hole to be measured can be visually observed through the circuit control display lamp 221 shown in fig. 3, thereby not only avoiding the error of artificial judgment, but also reducing the error generated when the inner diameter of the hole to be measured needs to be measured subsequently.
As an alternative embodiment, the axial length of the insulating segment 12 is greater than 2mm, so that there is sufficient distance between the conducting segments 11 to ensure good insulating performance between the conducting segments 11, and the material of the insulating segment 12 is preferably an insulating rubber gasket, which meets the condition that the insulating and axial length is greater than 2mm, and the rubber material is also easily adhered to the conducting segments 11, which is convenient for processing, and compared with the rest insulating material, the rubber has the advantage of low cost.
As an alternative embodiment, the number of conductive segments 11 is 3; the bottom end of the fixed rod 25 is detachably connected with the side wall of the conductive section 11 positioned in the middle through a bolt, the side wall of the conductive section 11 is provided with a mounting groove 13, the bottom of the mounting groove 13 is provided with a threaded hole, the end part of the fixed rod 25 is inserted into the mounting groove 13 of the conductive section 11, and the bolt penetrates through the threaded hole and then is in threaded connection with the end part of the fixed rod 25.
In a certain sense, when the aperture of the measured hole is larger and the axial length is larger, the number of the conductive segments 11 is larger or the lengths of the conductive segments 11 at two ends are larger, the measurement result is more accurate, but in order to facilitate manufacturing and processing of the measurement base 1, the length of the measurement base 1 is matched with the axial length of the measured hole, 3 conductive segments 11 are set, the lengths of the conductive segments 11 at two ends can be adjusted to be matched with the axial length of the measured hole, and further, the lengths of the conductive segments 11 at the left end and the right end are the same, so that the accuracy of the measurement result is ensured. The perpendicularity between the fixed rod 25 and the conductive section 11 in the middle is smaller than 0.01, the coaxiality between the fixed rod 25 and the upper measuring contact 211 is smaller than 0.01, the fixed rod 25 is connected with the mounting groove 13 formed in the conductive section 11 in the middle through a bolt, the fixed rod 25 and the measuring base 1 are detachably connected, the measuring device slightly larger than the aperture of the measured hole can be selected by changing the height of the fixed rod 25, the measured holes with various sizes can be measured without changing the whole measuring device, and the universality of the device is improved. Further, in order to prevent the head of the bolt from interfering with the measurement result of the measurement base 1, a receiving groove coaxial with the threaded hole is formed in the conductive segment 11 in the middle on the side of the threaded hole away from the mounting groove 13, and is used for receiving the head of the bolt, so that the depth of the receiving groove needs to be greater than the height of the head of the bolt. Furthermore, in order to facilitate the use of the device, the holes to be measured of various sizes can be measured without replacing the fixing rod 25, and the fixing rod 25 is set to be a telescopic rod with adjustable length.
As an optional embodiment, the groove walls of the mounting groove 13 are all inclined towards the direction away from the groove hole, so that when the fixing rod 25 is mounted on the measuring base 1, the groove walls of the mounting groove 13 and the side wall of the fixing rod 25 can be prevented from generating a large friction force, and meanwhile, the groove walls of the mounting groove 13 and the side wall of the conducting segment 11 need to be in smooth transition, so that the tip of the notch of the mounting groove 13 is reduced, and an operator is prevented from being injured when mounting.
As an optional embodiment, the tip of the measuring contact 211 is spherical, if the measuring contact 211 is a tip or a plane, the hole wall may be scratched when the measuring front end 2 slides along the inner wall of the hole to be measured around the axis of the measuring base 1, if the measuring contact 211 is an arc surface having the same shape as the arc of the inner wall of the hole to be measured, not only is the friction between the measuring contact 211 and the inner wall of the hole to be measured large in the rotating process, which causes damage, but also different measuring contacts 211 need to be frequently replaced to adapt to the inner wall of the hole to be measured with different hole diameters, otherwise, the measuring result may be inaccurate.
In another embodiment, there is provided a method for measuring the inner diameter of a hole, using the device for measuring the inner diameter of a hole as described above, comprising the steps of:
s1: adjusting the telescopic rod 21 according to the estimated inner diameter D of the hole to be measured and the tolerance requirement +/-E so as to enable the natural height of the measuring device to be D + nE; wherein n is more than or equal to 10;
s2: placing the measuring device in the hole to be measured, so that the measuring base 1 at the bottom end and the measuring contact 211 at the top end are both in contact with the inner wall of the hole to be measured;
s3: adjusting the measuring base 1 to ensure that the side wall of the measuring base 1 is tangent to the inner wall of the hole to be measured;
s4: rotating the measuring contact 211 along the axis of the measuring base 1 to obtain the minimum compression value M of the telescopic rod 21 during the rotation process;
and S5, obtaining the measured inner diameter value d of the measured hole according to the M and the natural height of the measuring device.
In the present embodiment, the measurement process refers to the process described in the measurement device, and is not described herein again.
Optionally, in S4, the measurement device rotates around the axis of the measurement base 1 in the left and right directions, and the rotation angle is not less than 30 degrees, so as to ensure that the range of the compression amount of the telescopic rod 21 covers the minimum M in the rotation process, thereby further ensuring the accuracy of the measurement result.
The measuring method based on the hole inner diameter measuring device is simple in operation mode, can finish measurement without experience judgment of professional operators, is convenient to read by using electronic measurement, and has smaller measuring error compared with the traditional measuring mode.
It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The device for measuring the inner diameter of the hole is characterized by comprising a measuring front end and a measuring base arranged at the bottom end of the measuring front end; wherein the content of the first and second substances,
the measuring base is a cylinder, the measuring base is used for abutting against the inner wall of the measured hole when the inner diameter of the hole is measured, and the side wall of the measuring base is tangent to the inner wall of the measured hole;
the measuring front end is perpendicular to the axis of the measuring base and comprises a measuring contact fixing rod, a telescopic rod and a display device, one end of the fixing rod is connected with the measuring base, the other end of the fixing rod is connected with one end of the telescopic rod, and the measuring contact is connected with the other end of the telescopic rod;
the measuring contact is used for abutting against the inner wall of the measured hole when the inner diameter of the hole is measured, and can slide along the inner wall of the measured hole when the measuring contact rotates around the axis of the measuring base;
the display device is used for displaying the contact state of the measuring base and the inner wall of the measured hole and displaying the measured numerical value.
2. A device for measuring an inner diameter of a hole as claimed in claim 1, wherein the display means comprises a display; wherein the content of the first and second substances,
the display is internally provided with a data processing module which is used for converting the received signals into digital signals;
a sensing module is arranged in the telescopic rod and is electrically connected with the data processing module;
the sensing module is used for collecting measuring signals and transmitting the measuring signals to the data processing module, the data processing module processes the received measuring signals and transmits the processed measuring signals to the display, and the display is used for displaying the measuring data.
3. The device for measuring the inner diameter of a hole according to claim 2, wherein the telescopic rod comprises a first connecting rod, a second connecting rod and a spring, a first mounting hole is formed at the lower end of the first connecting rod, the spring is wound around one end of the second connecting rod, one end of the spring is connected with the wall of the first mounting hole, and the other end of the spring is connected with the side wall of the second connecting rod;
the upper end of the fixed rod is provided with a second mounting hole, one end of the second connecting rod extends out of the first mounting hole and is inserted into the second mounting hole, and the second connecting rod is detachably connected with the second mounting hole.
4. The device of claim 1, wherein the measurement base comprises a plurality of conductive segments and insulating segments, the plurality of conductive segments are of the same diameter and are coaxially arranged, and every two conductive segments are connected through one insulating segment.
5. A bore diameter measurement device as claimed in claim 4, wherein the axial length of the insulating section is greater than 2 mm.
6. A bore diameter measurement device according to claim 5, wherein the number of said conductive segments is 3;
the bottom end of the fixed rod is detachably connected with the side wall of the conductive section, which is positioned in the middle, through a bolt, a mounting groove is formed in the side wall of the conductive section, a threaded hole is formed in the bottom of the mounting groove, the end part of the fixed rod is inserted into the mounting groove of the conductive section, and the bolt penetrates through the threaded hole and then is in threaded connection with the end part of the fixed rod.
7. A hole diameter measuring device as claimed in claim 3, wherein the walls of the mounting groove are inclined away from the slot.
8. A bore diameter measurement device according to any of claims 1 to 7, wherein the end of the measurement probe in contact with the bore being measured is spherical.
9. A method for measuring the inner diameter of a hole, which uses the measuring apparatus for the inner diameter of a hole according to any one of claims 1 to 8, comprising the steps of:
s1: adjusting the telescopic rod according to the estimated inner diameter D of the hole to be measured and the tolerance requirement +/-E so that the natural height of the measuring device is D + nE; wherein n is more than or equal to 10;
s2: placing a measuring device in the hole to be measured, so that the measuring base at the bottom end and the measuring contact at the top end are both in contact with the inner wall of the hole to be measured;
s3: adjusting the measuring base to enable the side wall of the measuring base to be tangent with the inner wall of the measured hole;
s4: rotating the measuring contact along the axis of the measuring base to obtain the minimum compression value M of the telescopic rod in the rotating process;
and S5, obtaining the measured inner diameter value d of the measured hole according to the M and the natural height of the measuring device.
10. A hole inner diameter measuring method according to claim 9, wherein in S4, the rotation angle is not less than 30 degrees during the rotation of the measuring device around the axis of the measuring base.
CN202111105049.XA 2021-09-22 2021-09-22 Hole inner diameter measuring device and measuring method Active CN113932688B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111105049.XA CN113932688B (en) 2021-09-22 2021-09-22 Hole inner diameter measuring device and measuring method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111105049.XA CN113932688B (en) 2021-09-22 2021-09-22 Hole inner diameter measuring device and measuring method

Publications (2)

Publication Number Publication Date
CN113932688A true CN113932688A (en) 2022-01-14
CN113932688B CN113932688B (en) 2022-10-25

Family

ID=79276228

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111105049.XA Active CN113932688B (en) 2021-09-22 2021-09-22 Hole inner diameter measuring device and measuring method

Country Status (1)

Country Link
CN (1) CN113932688B (en)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2093379U (en) * 1991-06-08 1992-01-15 上海量具刃具厂 Electronic numeral display inside micrometer
CN2133819Y (en) * 1992-07-03 1993-05-19 柳州铁路局计量所实验工厂 Bore diameter measuring instrument
JP2002365004A (en) * 2001-06-08 2002-12-18 Japan Tobacco Inc Internal circumference inspecting system for flexible endless member
CN101033533A (en) * 2006-03-07 2007-09-12 日产自动车株式会社 Basic component, cylindrical internal surface treatment method and treatment device
CN101038146A (en) * 2006-03-15 2007-09-19 哈尔滨汽轮机厂有限责任公司 Luminous inside micrometer used for steam turbine three cylinders jointing and internal sleeve finding
CN202274848U (en) * 2011-10-16 2012-06-13 余修铭 Novel large aperture measuring tool
CN203323632U (en) * 2013-06-19 2013-12-04 大连船舶重工集团有限公司 Inner diameter micrometer based on light-emitting suite
CN203464877U (en) * 2013-07-18 2014-03-05 江苏通圆回转支承有限公司 Special gauge for detecting inner raceway of slewing bearing
CN104359376A (en) * 2014-11-28 2015-02-18 湖南大麓管道工程有限公司 Device and method for measuring diameter of underground pipe network
CN104976941A (en) * 2015-08-11 2015-10-14 苏州莱测检测科技有限公司 Device for detecting large inner diameter
CN106767303A (en) * 2015-11-19 2017-05-31 綦江永跃齿轮有限公司 Adjustable length Endoporus measuring device
CN208952855U (en) * 2018-09-03 2019-06-07 南通市通佳工程质量检测有限公司 A kind of measuring scale accurately measuring pipe internal diameter and out-of-roundness

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2093379U (en) * 1991-06-08 1992-01-15 上海量具刃具厂 Electronic numeral display inside micrometer
CN2133819Y (en) * 1992-07-03 1993-05-19 柳州铁路局计量所实验工厂 Bore diameter measuring instrument
JP2002365004A (en) * 2001-06-08 2002-12-18 Japan Tobacco Inc Internal circumference inspecting system for flexible endless member
CN101033533A (en) * 2006-03-07 2007-09-12 日产自动车株式会社 Basic component, cylindrical internal surface treatment method and treatment device
CN101038146A (en) * 2006-03-15 2007-09-19 哈尔滨汽轮机厂有限责任公司 Luminous inside micrometer used for steam turbine three cylinders jointing and internal sleeve finding
CN202274848U (en) * 2011-10-16 2012-06-13 余修铭 Novel large aperture measuring tool
CN203323632U (en) * 2013-06-19 2013-12-04 大连船舶重工集团有限公司 Inner diameter micrometer based on light-emitting suite
CN203464877U (en) * 2013-07-18 2014-03-05 江苏通圆回转支承有限公司 Special gauge for detecting inner raceway of slewing bearing
CN104359376A (en) * 2014-11-28 2015-02-18 湖南大麓管道工程有限公司 Device and method for measuring diameter of underground pipe network
CN104976941A (en) * 2015-08-11 2015-10-14 苏州莱测检测科技有限公司 Device for detecting large inner diameter
CN106767303A (en) * 2015-11-19 2017-05-31 綦江永跃齿轮有限公司 Adjustable length Endoporus measuring device
CN208952855U (en) * 2018-09-03 2019-06-07 南通市通佳工程质量检测有限公司 A kind of measuring scale accurately measuring pipe internal diameter and out-of-roundness

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
周兴林等: "小深孔内径电容式测量方法的研究", 《中国机械工程》 *
周兴林等: "小深孔内径电容式测量方法的研究", 《中国机械工程》, no. 21, 31 December 2007 (2007-12-31) *
网络: "《百度百科》", 3 August 2021 *

Also Published As

Publication number Publication date
CN113932688B (en) 2022-10-25

Similar Documents

Publication Publication Date Title
CN104931260A (en) An eddy current displacement sensor locating clamping mechanism specially used for a high-speed light and thin gear
JP2012522209A (en) Measuring and inspection equipment
CN203704817U (en) Thread plug gauge used for detecting taper internal threads of graphite electrode
CN113932688B (en) Hole inner diameter measuring device and measuring method
CN106403756A (en) Long-pipe taper thread measurement device, taper plug gauge clamp and taper ring gauge clamp
US4942672A (en) Method of measuring the height of burrs and a burr measuring head
CN211824253U (en) Angular displacement sensor calibration system
CN108253910A (en) Graphite electrode ontology or connector taper thread automatic measurement mechanism, system and method
CN109059830B (en) Bolt elongation detection device
CN107966090B (en) Quick-replaceable probe type measuring device for detecting depths of narrow groove and fine blind hole
CN113739667B (en) Detection tool and detection method for turbocharger middle shell
CN213688289U (en) Arc radius detection device
CN102235846A (en) Plum blossom hole measuring device
CN114061415A (en) Taper hole measuring device and measuring method
CN210198249U (en) Crankshaft taper length measuring device
CN210128683U (en) Workpiece roundness detection tool
CN209055060U (en) A kind of coaxiality check fixture of the support of bearing
CN214149076U (en) Taper diameter measuring equipment
CN111323651A (en) Clamp suitable for impedance measurement under high-temperature and high-frequency conditions
CN212872569U (en) Crimping resistance measuring device
CN220583251U (en) Hub taper gauge tool
CN218583926U (en) Detection device for detecting position of contact element of connector
CN210220958U (en) Calibration device of eddy current displacement sensor for precision shafting
CN113932702A (en) Base of detection device and processing method thereof
CN215810629U (en) Screw hole straightness gauge that hangs down

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant