TWI393856B - Measuring apparatus for aperture - Google Patents

Description

Inner diameter measuring device

The present invention relates to an inner diameter measuring device and a measuring method thereof.

The industry usually uses a vernier caliper to roughly measure the inner diameter of an object: its two inner measuring claws are inserted into the inner hole of the object to be measured and abut against the inner wall of the inner hole, and then the inner diameter of the object is obtained by reading. When measuring the inner diameter using a vernier caliper, since the position of the inner measuring claws is likely to be not two circumferential points on the diameter of the inner hole of the object to be measured, but two circumferential points on one string, The measured inner diameter of the hole is small.

In view of the above, it is necessary to provide a simple and effective inner diameter measuring device.

A method of measuring the inner diameter is also provided.

An inner diameter measuring device for measuring an inner diameter of a hole of an object, comprising a sensing unit, a signal processing unit and a display unit, wherein the signal processing unit is connected to the sensing unit and the display unit, the sensing unit comprises a a multi-jaw detecting contact comprising a plurality of circumferentially arranged measuring jaws, the measuring claw ends being outwardly scatterable against an inner wall of the hole of the object, the multi-jaw detecting contact being provided with an angle The sensor is configured to sense the angle at which the measuring claws are opened and generate an inductive signal to be sent to the signal processing unit; the signal processing unit processes the sensing signal and calculates the angle value of each measuring claw to obtain the inside of the object. The display unit displays the inner diameter.

An inner diameter measuring method includes the following steps: starting up (POWER-ON), initializing the system, and clearing the display information of the display unit, so that each measuring claw of the multi-jaw detecting contact is in a state to be measured; a multi-jaw detecting contact of the measuring device protrudes into the hole of the object; the measuring claws of the multi-jaw detecting contact of the sensing unit are emitted in an emitted manner until at least one of the measuring claw and the inner wall of the hole of the object to be measured Corresponding to obtain an inductive signal including an angle value of the opening of the measuring claw; the signal processing unit receives the sensing signal from the sensing unit, processes the sensing signal, and calculates the object to be tested according to the formula d=D+2Lsinθ The inner diameter d of the hole, where D is the diameter of the circumference of the end of the measuring jaw when the state to be measured, L is the outer length of the measuring jaw, θ is the angle at which the measuring jaw is opened during the measurement; and the inner diameter of the obtained inner diameter The value d is displayed on the display unit.

Compared with the prior art, the detecting device and the detecting method thereof of the present invention use the opening angle of the measuring claw to calculate the inner diameter of the object to be tested, and the measurement result is accurate.

Referring to FIG. 1 , a preferred embodiment of the inner diameter measuring device of the present invention includes a sensing unit 100 , a signal processing unit 200 , and a display unit 300 .

Referring to FIG. 2 and FIG. 3 together, the sensing unit 100 is an umbilical multi-jaw detecting contact 10 in this embodiment. The multi-jaw detecting contact 10 includes at least three measuring claws 11 of an outer length L, and the end positions of the measuring claws 11 On a circumference of diameter D in a horizontal plane. In the state to be measured, the measuring claws 11 are in a vertical and mutually parallel position; when measuring, the measuring claws 11 are radiated like an umbilical of an open umbrella, and each measuring claw 11 is in a state to be measured. At an angle θ. The multi-jaw detecting contact 10 is provided with an angle sensor 12 for sensing the angle θ at which the measuring claw 11 is opened and transmitting the angle θ to the signal processing unit 200.

The signal processing unit 200 is configured to receive an inductive signal from the sensing unit 100 including the opening angle of each of the measuring claws 11 and perform a processing operation on the sensing signal. Assuming that the inner diameter of the object to be tested is d, then d = D + 2 Lsin θ. The signal processing unit 200 includes a micro-processed wafer 20 in the present embodiment.

The display unit 300 is configured to display the detection result obtained after being processed by the signal processing unit 200. In the embodiment, the display unit 300 includes a liquid crystal display 31.

A pressure sensor 14 may be disposed on the outer side of the end of each of the measuring claws 11 so that an induction signal is generated when the measuring claw 11 touches the side wall of the inner hole of the object to be measured to determine whether or not the measuring claw 11 has not touched the The side wall of the inner hole. The measuring claws 11 may be synchronously linked, or the respective measuring claws 11 may be respectively operated.

If the measuring claws 11 are synchronously linked, that is, the opening angle of one of the measuring claws is θ, the opening angles of the other measuring claws must also be θ. If the measured inner hole is a circular shape in a non-ideal state, when the measuring claws 11 are projected into the inner hole of the object to be tested, one or more of the measuring claws contact the inner wall of the inner hole, and the other measuring claws are The inner wall of the inner bore was not touched, and the inner diameter measured at this time was the diameter of the largest circle inscribed with the inner bore.

If the measuring jaws 11 are respectively actuated, that is, the measuring claws are emitted in an emission state when measured until they respectively contact the inner wall of the inner hole. If the measured inner holes are circular in a non-ideal state, when the measuring claws 11 are projected into the inner holes of the object to be tested, the angles θ at which the measuring claws 11 are opened are not completely the same. After the sensing unit 100 transmits the sensing signal including the opening angle θ of each measuring claw 11 to the signal processing unit 200, the signal processing unit 200 can calculate the maximum diameter and the minimum diameter of the measured inner hole according to the respective θ values. The diameter is averaged and the result is output to the display unit 300.

Referring to FIG. 4 together, the flow of the inner diameter measuring method of the present invention is as follows:

In step S402, after the power-on (POWER-ON), the system performs initialization, for example, clearing the display information of the display unit, so that the respective measuring claws 11 of the multi-jaw detecting contact 10 are in a state to be measured. The outer length of the measuring claw 11 is L, and the ends of the measuring claws 11 are on a circumference of a diameter D on a horizontal surface in a state to be measured.

Step S404, placing the object to be measured on a platform such that the inner hole of the object to be measured is axially perpendicular to the platform.

Step S406, the multi-jaw detecting contact 10 of the inner diameter measuring device is inserted into the inner hole, and each measuring claw 11 is perpendicular to the platform.

Step S408, the measuring claws 11 of the multi-jaw detecting contact 10 are scattered in an emission state and interfere with the inner hole wall of the object to be measured, and generate an inductive signal including an angle θ value of each measuring claw 11 to be opened.

In step S410, the signal processing unit 200 receives the sensing signal from the sensing unit 100, processes the sensing signal, and calculates the inner diameter d of the object to be tested according to the formula d=D+2Lsinθ.

In step S412, the value d of the obtained inner diameter is displayed on the display unit 300.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

100‧‧‧Sensor unit

200‧‧‧Signal Processing Unit

300‧‧‧ display unit

10‧‧‧Multi-jaw detection contacts

11‧‧‧Measured claws

12‧‧‧ Angle Sensor

14‧‧‧ Pressure Sensor

20‧‧‧Microprocessor Wafer

31‧‧‧LCD display

1 is a circuit block diagram of an inner diameter measuring device of the present invention.

2 is a schematic view showing the structure of a preferred embodiment of the inner diameter measuring device of the present invention in an unmeasured state.

3 is a schematic view showing the structure of a preferred embodiment of the inner diameter measuring device of the present invention in a measurement state.

4 is a flow chart of a method of measuring an inner diameter of the present invention.

100‧‧‧Sensor unit

200‧‧‧Signal Processing Unit

300‧‧‧ display unit

12‧‧‧ Angle Sensor

14‧‧‧ Pressure Sensor

20‧‧‧Microprocessor Wafer

31‧‧‧LCD display

Claims (7)

An inner diameter measuring device for measuring an inner diameter of a hole of an object, comprising a sensing unit, a signal processing unit and a display unit, wherein the signal processing unit is connected to the sensing unit and the display unit, the sensing unit comprises a a multi-jaw detecting contact comprising a plurality of circumferentially arranged measuring jaws, the measuring claw ends being outwardly scatterable against an inner wall of the hole of the object, the multi-jaw detecting contact being provided with an angle The sensor is configured to sense the angle at which the measuring claws are opened and generate an inductive signal to be sent to the signal processing unit; the signal processing unit processes the sensing signal and calculates the angle value of each measuring claw to obtain the inside of the object. The display unit displays the inner diameter. The inner diameter measuring device according to claim 1, wherein the multi-jaw detecting contact comprises at least three measuring claws of equal outer length, the ends of the measuring claws being located on a circumference of a horizontal plane. The inner diameter measuring device according to claim 2, wherein the measuring claws are in a vertical and mutually parallel position in a state to be measured; and when measuring, the measuring claws are in an emission-like manner to disperse the hole touching the object. The inner wall, the angle between each measuring jaw and its state to be measured is the angle at which the measuring jaw is opened during the measurement. The inner diameter measuring device according to claim 3, wherein the signal processing unit calculates the inner diameter d of the hole of the object to be tested according to d=D+2Lsinθ, where D is the end of the measuring claw when the state to be measured is The diameter of the circumference, L is the outer length of the measuring jaw, and θ is the angle at which the measuring jaw is opened during the measurement. The inner diameter measuring device according to claim 1, wherein the multi-claw The measuring claws of the detecting contacts are synchronously linked, and the angles at which the measuring jaws are opened are equal. In this case, the measured inner diameter is the diameter of the largest circle inscribed with the hole of the object. The inner diameter measuring device according to claim 1, wherein the measuring claws of the multi-jaw detecting contact are respectively operated, and if the holes of the object are non-round holes, the angles of the measuring claws are not completely the same. In this case, the signal processing unit calculates the maximum diameter, the minimum diameter, and the diameter mean of the holes of the object to be tested according to the angle values of the measured jaws. An inner diameter measuring method for an inner diameter measuring device according to claim 1, comprising the steps of: starting up, initializing the system, emptying display information of the display unit, and measuring each of the plurality of claw detecting contacts The claw is in a state to be measured; the multi-jaw detecting contact of the inner diameter measuring device is inserted into the hole of the object; and the measuring claws of the multi-claw detecting contact of the sensing unit are emitted in an emission state until at least one of the measuring claws Interacting with the inner wall of the hole of the object to be measured, thereby obtaining an inductive signal including an angle value of the opening of the measuring claw; the signal processing unit receives the sensing signal from the sensing unit, and processes the sensing signal according to the formula d =D+2Lsinθ calculates the inner diameter d of the hole of the object to be tested, where D is the diameter of the circumference of the end of the measuring jaw when the state to be measured, L is the outer length of the measuring jaw, and θ is the measured jaw at the time of measurement The angle of opening; and the value d of the obtained inner diameter is displayed on the display unit.