Self-positioning high-precision aperture measuring device

[0025] Example 1

[0026] A self-positioning high-precision aperture measuring device includes a bracket 1, a coarse adjustment knob 2, an adjustable support arm 4, a measuring rod 5, and a self-positioning structure 6. There are two adjustable support arms 4 and measuring rods 5. An adjustable support arm 4 and a measuring rod 5 are respectively provided at both ends of 1, a self-positioning structure 6 is provided outside each adjustable support arm 4, and a thick knob is provided on the housing of the support 1. The bracket 1 is provided with a sliding groove; the coarse adjustment knob 2 is located in the center of the bracket 1, and under the coarse adjustment knob 2 is a high-precision straight/helical gear 8, which can be unlocked and locked by pulling up and pressing down.

[0027] An electronic module can also be installed on the shell of the bracket 1, which can realize μ-level high-precision ranging, and can display the measured value and the percentage of power in real time. The display includes a zero setting button, a forward/backward data browsing button, and a data wireless/wired transmission button. , Is an additional feature of this program.

[0028] Two adjustable support arms 4 are located on both sides of the coarse adjustment knob 2. The adjustable support arm 4 includes a straight/helical rack 7 of the support arm. The straight/helical gear coaxial with the coarse adjustment knob 2 constitutes a high-precision gear rack The movement pair is driven by the knob to achieve the same extension/contraction; one end of the measuring rod 5 is fixedly connected to the ruby ​​spherical probe 13, the other end is connected to the spring 9 in the compressed state, and the measuring rod 5 is installed with a linear grating ruler; The positioning structure 6 includes a horizontal damping rod 10 and a vertical damping rod 14 with the same specifications. One end of the horizontal damping rod 10 is connected with a horizontal universal ball 11, and one end of the vertical damping rod 14 is connected with a vertical universal ball 12. The module can Quick disassembly and assembly with the support arm, the horizontal damping rod 10 includes an angle of 60°, and the vertical damping rod 14 includes an angle of 30°. The damping rods in each direction are symmetrical about the axis of the measuring rod 5. When the device is placed in the cylindrical hole, The compressed damping rod can adjust the position adaptively to quickly reach the force balance state, and finally stabilize at this position. At this time, the measuring rod 5 is located on the radial tangent circular plane of the cylindrical surface of the inner wall of the hole and passes through the center of the circle. The value is the hole diameter. Both the horizontal universal ball 11 and the vertical universal ball 12 are universal balls with low friction coefficient.

[0029] Example 2

[0030] Such as figure 1 As shown, a self-positioning high-precision aperture measuring device includes a bracket 1, a coarse adjustment knob 2, an adjustable support arm 4, a measuring rod 5, and a self-positioning structure 6. The device uses horizontal and vertical damping rods and The coordinated movement of the universal ball reaches the state of force balance, ensuring that the measured length direction is in the diameter direction of the radial tangent circle. The linear grating ruler is used to realize the rapid and accurate measurement of the aperture. The device needs to be used in conjunction with the outer diameter micrometer.

[0031] Coarse adjustment knob 2 includes: coarse adjustment knob 2, high precision straight/helical gear 8;

[0032] Adjustable arm 4 includes: adjustable arm 4, arm straight/oblique rack 7;

[0033] Self-positioning structure 6 includes: horizontal damping rod 10, horizontal universal ball 11, vertical universal ball 12, vertical damping rod 14;

[0034] Measuring rod 5 includes: measuring rod 5, spring 9, ruby ​​ball probe 13;

[0035] To figure 1 , 2 , 3, 4, explain the operation process of this application, but this application is not limited to this example.

[0036] Step 1. Pull up and rotate the coarse adjustment knob 2 according to the theoretical value of the measured hole to drive the high-precision straight/helical gear 8 to drive the straight/helical rack 7 on the adjustable arm 4 to move the adjustable support When the arm 4 is in the proper position, press the coarse adjustment knob 2 to lock it. At this time, ensure that the measuring rod 5 and the self-positioning structure 6 in the free state of the device should be longer than the measured hole in the length direction;

[0037] Step 2: Calibrate the measuring rod 5 with an outside micrometer according to the theoretical value of the measured hole, that is, adjust the micrometer to the theoretical position of the measured hole diameter, and measure the measuring rod 5 at both ends of the device with a micrometer to ensure the ruby ​​spherical probe at both ends 13 Fit the measuring end surface of the micrometer and set the current measurement value to zero;

[0038] Step 3. Place the calibrated measuring device horizontally in the hole of the part to be tested. At this time, the self-positioning devices at both ends are compressed, and the measuring rod 5 closely fits the hole wall of the part under the pressure of the spring 9. When the symmetrically distributed horizontal damping rods 10 or vertical damping rods 14 are subjected to unequal forces, the horizontal universal ball 11 or the vertical universal ball 12 with a low friction coefficient will roll, driving the device to shift until the device In a state of force balance, after it stabilizes, measure and record the diameter in the current state;

[0039] Step 4: Read the measured value, or transfer the data to the computer through the transmission button, and add and subtract the theoretical value to the measured hole diameter value;

[0040] Step 5: Rotate horizontally for multiple angles, repeat step 4, radial multi-angle aperture value;

[0041] Step 6. Move multiple heights vertically, repeat steps 4 and 5 to obtain aperture values ​​of different heights and directions;

[0042] Step 7. Use the data transfer button to transfer the data to a computer, comprehensively evaluate the hole diameter, cylindricity, taper, etc.;

[0043] Step 8. After the measurement is completed, take out the device, pull up and rotate the coarse adjustment knob 2, retract the arm, remove the self-positioning structure 6, clean the parts and put them in the special packaging box.