CN202836443U - Device for measuring length of stepped hole inside deep hole - Google Patents

Abstract

The utility model discloses a device for measuring the length of a stepped hole in a deep hole, which comprises a measuring body, a spring, a measuring rod, a dial indicator, a fixed measuring block, and a dynamic measuring block. The measuring body is provided with a stepped hole, and one end of the measuring rod is located at In the step hole, the measuring rod is provided with a positioning shoulder, the spring is sleeved on the measuring rod, one end of the spring is positioned by the positioning shoulder, the other end of the spring is limited by the step of the step hole, and one end of the dial indicator is connected to the other end of the step hole. Extend into the step hole and contact with the end of the measuring rod. The measuring block is fixedly connected to the other end of the step hole. The measuring block is provided with a through hole for the measuring rod to protrude from. The other end of the measuring rod After passing through the through hole on the measuring block, it is fixedly connected with the moving measuring block. The utility model has the advantages of high measurement precision and high measurement efficiency.

Description

Measuring device for length of stepped hole in deep hole

technical field

The utility model relates to the technical field of measurement after workpiece processing, in particular to a device for measuring the length of a stepped hole in a deep hole.

Background technique

For workpieces with deep holes, in order to ensure the processing accuracy of the deep holes, it is an essential step to measure the processed deep holes. Figure 2 is a bushing with a deep hole. There is a stepped hole D2 at the bottom of the deep hole, and its length is L2. The size of the stepped hole L2 needs to be strictly controlled, so accurate measurement is required. The depth of the step hole L2=CA-CB is calculated, not only the measurement error is large, but also very troublesome, and the measurement efficiency is low. For this reason, a special measuring tool is needed to measure the stepped hole similar to this structure

Contents of the invention

In view of the above technical problems, the purpose of this utility model is to provide a device for measuring the length of stepped holes in deep holes with high precision. The utility model also has the advantage of high measurement efficiency.

The technical scheme for realizing the above-mentioned purpose is as follows:

The device for measuring the length of a stepped hole in a deep hole includes a detection body, a spring, a measuring rod, a dial indicator, a fixed measuring block, and a dynamic measuring block. There is a positioning shoulder, the spring is set on the measuring rod, one end of the spring is positioned by the positioning shoulder, the other end of the spring is limited by the step of the step hole, and one end of the dial indicator is extended from the end of the step hole to the step hole and The ends of the measuring rod are in contact, and the measuring block is fixedly connected to the other end of the step hole. The measuring block is provided with a through hole for the measuring rod to protrude from, and the other end of the measuring rod passes through the After the through hole, it is fixedly connected with the dynamic measuring block.

Using the above scheme, extend one end of the detection body into the measured step hole, first let the end face of the dynamic measuring block contact the A surface of the workpiece step hole, and then let the end face of the fixed measuring block contact the B surface of the workpiece step hole, at this time , the reading of the dial indicator is the relative difference between the length dimension of the step hole D2 and the reference value. When the reading is 0-0.05mm smaller than the reference value, that is, when the pointer rotates forward and the reading is 0-0.05mm, the length of the stepped hole is qualified. The utility model has the advantages of high measurement precision and high measurement efficiency.

The measuring block is a cylindrical measuring block, the dynamic measuring block is a cylindrical dynamic measuring block, and the diameter of the axial end surface of the measuring block is larger than the diameter of the axial end surface of the dynamic measuring block. Such a structure can make the dynamic measuring block and the fixed measuring block contact with the hole end surface of the measured step hole respectively.

The measuring device also includes a reference block for calibrating the dial indicator, and an analog step hole is arranged on the reference block. Proofreading the dial indicator through the reference block is beneficial to improving and ensuring the measurement accuracy.

A sleeve is provided on the outer circumference of the inspection body, and the inspection body is slidably matched with the sleeve, and a detachable bracket is arranged on the outer circumference of the sleeve. The sleeve can play a guiding role for the detection body, and prevent the dynamic measuring block and the fixed measuring block from contacting the reference block or the end surface of the stepped hole of the workpiece in an inclined state, which is beneficial to ensure the accuracy of the measurement.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of tested workpiece;

In the accompanying drawings, 10 is the inspection body, 11 is the step hole, 20 is the spring; 30 is the measuring rod, 40 is the dial indicator, 50 is the fixed measurement block, 60 is the dynamic measurement block, 70 is the reference block, and 71 is the simulated step Hole, 80 is a sleeve, and 81 is a support.

Detailed ways

Referring to Fig. 1, the device for measuring the length of a stepped hole in a deep hole of the present invention includes a detection body 10, a spring 20, a measuring rod 30, a dial indicator 40, a fixed measuring block 50, a dynamic measuring block 60, a reference block 70, and a sleeve 80. The inspection body 10 is provided with a step hole 11, so that the inspection body 10 is a cylindrical body. One end of the measuring rod 30 is located in the step hole 11, the measuring rod 11 is provided with a positioning shoulder 12, the spring 20 is sleeved on the measuring rod, one end of the spring 20 is positioned by the positioning shoulder, and the other end of the spring 20 passes through the step hole 11 Step limit. One end of the dial gauge 40 protrudes from one end of the stepped hole into the stepped hole to contact with the end of the measuring rod 30 . The measuring block 60 is fixedly connected to the other end of the step hole, the measuring block 50 is provided with a through hole for the measuring rod to stretch out, and the other end of the measuring rod 30 passes through the through hole on the measuring block 50, and is connected with The dynamic measuring block 60 is fixedly connected. The measuring block 50 is a cylindrical measuring block, the dynamic measuring block is a cylindrical dynamic measuring block, and the diameter of the axial end surface of the measuring block is larger than the diameter of the axial end surface of the dynamic measuring block. The reference block 70 is used to calibrate the dial indicator 40, and the reference block 70 is provided with an analog step hole 71, which is used to simulate the measured step hole, so that the dial indicator is calibrated by the reference block 70. A sleeve 80 is provided on the outer circumference of the inspection body 10 , and the inspection body 10 is slidably matched with the sleeve 80 , and a detachable bracket 81 is provided on the outer circumference of the sleeve 80 .

Referring to Figure 1 and Figure 2, before the measurement, use the reference block 70 to calibrate the dial indicator 40, and when using the reference block to calibrate the dial indicator, make the hole depth H the maximum limit size L2+0.10mm of the measured dimension L2 , use L2+0.10mm to proofread the dial gauge so that the pointer points to zero. The specific method of proofreading the dial indicator 1 is to let the dynamic measuring block 60 of the measuring tool contact the D surface of the reference block 70, hold the measuring body 10 with the left hand and gently compress the spring 20, and let the end surface of the fixed measuring block 50 contact the reference block 70 contact with the E surface, then set the dial indicator 40 to zero.

When measuring, insert one end of the detection body 10 into the measured step hole D2, and use the same method as when calibrating the dial indicator, first let the end face of the dynamic measuring block 60 touch the A surface of the workpiece step hole, and then let the fixed measuring block The end surface of 50 is in contact with surface B of the workpiece step hole. At this time, the reading of the dial indicator 40 is the relative difference between the length dimension of the step hole D2 and the reference value. When the reading is 0-0.05mm smaller than the reference value, that is, when the pointer rotates forward and the reading is 0-0.05mm, the length L2 of the step hole D2 is qualified.

Claims (4)

1. stepped hole length-measuring appliance in the deep hole, it is characterized in that: comprise the cubing body, spring, measuring staff, dial gauge, the location survey piece, the moving piece of surveying, the cubing body is provided with stepped hole, one end of measuring staff is arranged in stepped hole, measuring staff is provided with the location convex shoulder, spring housing is on measuring staff, one end of spring is by convex shoulder location, location, the other end of spring is spacing by the step of stepped hole, one end of dial gauge extend into the stepped hole from stepped hole one end and contacts with the end of measuring staff, described location survey piece is fixedly connected on the other end aperture of stepped hole, the location survey piece is provided with the through hole that stretches out for measuring staff, the other end of measuring staff is fixedly connected with described moving survey piece after passing through hole on the location survey piece.

2. stepped hole length-measuring appliance in the described deep hole according to claim 1, it is characterized in that: described location survey piece is columniform location survey piece, and described moving survey piece is columniform moving survey piece, and the diameter of location survey piece axial end is greater than the moving diameter of surveying the piece axial end.

3. stepped hole length-measuring appliance in the described deep hole according to claim 1, it is characterized in that: described measurement mechanism also comprises a reference block that is used for the check and correction dial gauge, and reference block is provided with the simulation stepped hole.

4. stepped hole length-measuring appliance in the described deep hole according to claim 1, it is characterized in that: the excircle of described cubing body is provided with sleeve, and cubing body and this sleeve are slidingly matched, and are provided with removable support at the excircle of sleeve.

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