CN203811098U - Depth measurement auxiliary tool for inner hole circular grooves - Google Patents

Abstract

The utility model discloses a depth measurement auxiliary tool for inner hole circular grooves. The tool is composed of a pair of semi-cylindrical wedges which are arranged up and down. The upper semi-cylindrical wedge and the lower semi-cylindrical wedge cooperates with each other through the inclined surfaces, when the end surfaces of the semi-cylindrical wedges are aligned, a complete cylinder is formed, and the diameter of the cylinder is smaller than the inner diameter of the hole in which an inner hole circular groove is arranged. The cylinder surface of the lower semi-cylindrical wedge is provided with a radial probe. The radial probe is perpendicular to the axial projection line of the inclined surface of the lower semi-cylindrical wedge and is arranged on the climax of the arc section of the lower semi-cylindrical wedge. The height of the probe is larger than the depth of the inner hole circular groove, and the width of the probe is smaller than the width of the inner hole circular groove. The depth measurement auxiliary tool for inner hole circular groove has the advantages of high measurement precision, stable performance, easy manufacture, and low manufacture cost.

Description

Auxiliary tool for measuring the depth of inner hole annular groove

technical field

The utility model relates to a detection tool, in particular to an auxiliary tool for measuring the depth of an inner hole annular groove.

Background technique

In the existing measuring tools, the inner diameter of the inner hole annular groove is generally tested with a scissor type inner hole annular groove inner diameter caliper, as a Chinese patent document discloses a scissor inner diameter measuring tool (publication number: CN 103411514A, published Day: 2013.11.27), although the scissor-type inner diameter measuring tool can directly measure the inner diameter of the annular groove of the inner hole very conveniently and quickly, there are still some problems: first, the accuracy is not high, and the distance between its movable arm and the fixed arm The length of the dynamic arm of the movable arm (that is, the part outside the hole where the annular groove of the inner hole is located for measurement operation) is longer than its resistance arm, and the front end of the dynamic measuring hook is relative to the fixed measuring hook during measurement. The distance that the front end moves is greater than the relative distance that the rear end of the boom moves on the scale, and the amount of error will be enlarged during measurement, resulting in a decrease in measurement accuracy; second, the performance is unstable, and its boom and fixed arm are connected by hinges Forming a lever mechanism, the length of the movable arm and the fixed arm is longer, so that the movable arm and the fixed arm are easily deformed during measurement, and the structural stability is poor; third, the manufacturing cost is high, because its structural shape is relatively complicated, which affects the precision. If there are many points, it is necessary to ensure that the accuracy requirements are met, and the manufacturing cost is relatively high.

Contents of the invention

The technical problem solved by the utility model is to provide an auxiliary tool for measuring the depth of an inner hole annular groove with high measurement accuracy, stable and reliable performance, easy manufacture and low manufacturing cost.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

An auxiliary tool for measuring the depth of an annular groove in an inner hole. The tool is a pair of upper and lower half-cylindrical wedges. The upper and lower half-cylindrical wedges cooperate through their inclined surfaces. When their end faces are flush, they form a complete cylinder. The diameter of the cylinder is smaller than the inner diameter of the hole where the annular groove of the inner hole is located; a radial probe is arranged on the cylindrical surface of the lower half cylindrical wedge, and the radial probe is perpendicular to the axial projection line of the inclined plane and is located on the lower half cylindrical wedge The height of the vertex of the contour arc is greater than the depth of the annular groove of the inner hole, and its width is smaller than the width of the annular groove of the inner hole.

The slope angle of the semi-cylindrical wedge is 5.711°.

The beneficial technical effect of the utility model is:

(1) The utility model includes a pair of upper and lower arranged semi-cylindrical wedges. The upper and lower half-cylindrical wedges cooperate through their inclined surfaces. When the end faces are flush, a complete cylinder is formed. The diameter of the cylinder is smaller than that of the inner hole ring The inner diameter of the hole where the groove is located, and the inclination angle of their inclined plane relative to the central axis of the cylinder can be designed according to the accuracy required by the workpiece to be measured. Therefore, when making the utility model, the inclination angle of the inclined plane can be To achieve the required accuracy, thereby improving the detection accuracy;

(2) The upper and lower arranged semi-cylindrical wedges of this utility model are block-shaped, and the inclined surfaces that cooperate with each other during detection are large, so their inclined surfaces are less deformed, the product has better structure, is not easily deformed, and can The length of the positioning pin is determined according to the measured depth of the annular groove in the inner hole of the workpiece, so the performance of the utility model is stable and reliable;

(3) The utility model includes upper and lower arranged semi-cylindrical wedges and a radial measuring head, which is simple in structure, easy to manufacture, and low in manufacturing cost.

Description of drawings

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

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is a schematic diagram of the measurement principle of the present invention.

Detailed ways

In order to describe the technical features and functions of the utility model in detail, and to implement them according to the contents of this specification, the implementation of the utility model will be further described below in conjunction with the accompanying drawings.

As shown in Fig. 1, Fig. 2 and Fig. 3, it is an auxiliary tool for measuring the depth of the inner hole annular groove of a kind of preferred embodiment of the present utility model. The half-cylindrical wedge 1 and the upper half-cylindrical wedge 2 cooperate through their inclined surfaces, and when their end faces are flush, they form a complete cylinder whose diameter is smaller than the inner diameter of the hole where the annular groove of the inner hole is located; the column of the lower half-cylindrical wedge 1 There is a radial probe 3 on the surface, the radial probe 3 is perpendicular to the axial projection line of the slope and is located at the vertex of the contour arc of the lower half-cylindrical wedge 1, and the height of the radial probe 3 is greater than the inner hole annular groove The depth of the radial measuring head 3 is less than the width of the annular groove of the inner hole. The fixing method between the radial probe 3 and the lower half-cylindrical wedge 1 can be: a counterbore is opened on the cylindrical surface of the lower half-cylindrical wedge 1, and one end of the radial probe 3 is put into the counterbore and Connect with the counterbore with an interference fit.

The use process and measuring principle of the present utility model are as follows: referring to Fig. 1 and Fig. 4, the inclination angle β of the inclined plane is determined in advance when making the utility model, and is a known quantity; the lower half cylindrical wedge 1, the upper half cylindrical wedge 2 The sum of the diameter of the combined cylinder and the length of the radial extension of the radial probe 3 on the cylinder surface of the lower half-cylindrical wedge 1 is A and the diameter of the hole where the annular groove of the inner hole of the workpiece 4 is located is B, wherein, The values of A and B can be directly measured with a micrometer. When using the utility model for construction, select a suitable inclination angle β according to the accuracy required by the workpiece to be measured; after completing the aforementioned tool selection, first insert the end of the lower half-cylindrical wedge 1 with the radial probe 3 into the inner part of the tested piece In the hole of the hole where the annular groove of the hole is located, the slope of the lower half-cylindrical wedge 1 is upward to facilitate later detection work, and the front end of the radial probe 3 extends into the inner hole annular groove, so that the lower half-cylindrical wedge 1 is positioned, Restrict the movement of the lower half-cylindrical wedge 1 along the axial direction of the hole where the annular groove of the inner hole is located. Of course, in order to completely avoid the movement of the lower half-cylindrical wedge 1 along the axial direction of the hole where the annular groove of the inner hole is located, radial The front end of the probe 3 should match the width of the annular groove of the inner hole; then place the upper half-cylindrical wedge 2 on the aforementioned lower half-cylindrical wedge 1, and push the upper half-cylindrical wedge 2 on the lower half-cylindrical wedge. Slide on the inclined surface of wedge 1, push and slide the upper half cylindrical wedge 2 into the hole where the annular groove of the inner hole is located and squeeze tightly. When pushing the upper half cylindrical wedge 2, pay attention to keep the lower half cylindrical wedge Align the sides of the inclined surfaces of wedge 1 and upper half-cylindrical wedge 2; next, use a depth micrometer to measure where the upper half-cylindrical wedge 2 slides relative to the lower half-cylindrical wedge 1 and is located outside the hole where the annular groove in the inner hole is located. The distance from the end face of the end is X; finally according to the formula:

Y=X×tgβ+A

Z=Y-B

Calculate the measured value of the inner hole annular groove depth to be measured, where,

X is the distance of the upper half-cylindrical wedge 2 sliding relative to the end face of the lower half-cylindrical wedge 1 outside the hole where the annular groove of the inner hole is located;

Y is the indirect measurement value;

Z is the depth of the inner hole annular groove to be measured;

β is the inclination angle of the slopes of the lower half cylindrical wedge 1 and the upper half cylindrical wedge 2 relative to the central axis of the cylinder;

A is the sum of the diameter of the cylinder formed by the lower half-cylindrical wedge 1 and the upper half-cylindrical wedge 2 and the radial extension length of the radial probe 3 on the arc surface of the lower half-cylindrical wedge 1;

B is the diameter of the hole where the annular groove of the inner hole is located.

It can be seen from the above that the utility model converts the depth of the annular groove of the inner hole into the distance of the end surface of the upper half cylindrical wedge 2 sliding relative to the end surface of the lower half cylindrical wedge 1 located outside the hole where the annular groove of the inner hole is located, Then use a depth micrometer to measure the measured distance, and then obtain the corresponding inner hole annular groove depth through the above calculation, of course, get the inner hole annular groove depth and get the diameter of the inner hole annular groove, you can use the formula Z=2Y -B get. This shows that the utility model plays an auxiliary role in the detection process.

From the formulas Y=X×tgβ+A and Z=Y-B, it can be seen that when the values of A, B and X are measured with the required accuracy detection tool, the accuracy of the inner hole annular groove depth to be measured is inversely proportional to tgβ , that is, the greater the β, the lower the measurement accuracy of the utility model, and vice versa. Therefore, when making the utility model, an appropriate inclination angle β should be selected according to the accuracy required by the workpiece. In order to facilitate the calculation and the precision required by the workpiece, the slopes of the lower half-cylindrical wedge 1 and the upper half-cylindrical wedge 2 are preferably inclined surfaces with an inclination of 1:10 relative to the central axis of the cylinder. In this case The lower β value is 5.711°. At this time, the error of the accuracy of the depth of the annular groove in the inner hole calculated by the two formulas is reduced to one tenth, thereby improving the detection accuracy.

The utility model has been described in detail above with reference to the embodiments, which are illustrative rather than restrictive. Changes and modifications without departing from the general concept of the utility model are within the protection scope of the utility model.

Claims (2)

1. An auxiliary tool for measuring the depth of an inner hole annular groove, characterized in that the tool is a pair of upper and lower arranged semi-cylindrical wedges, and the upper and lower half-cylindrical wedges are matched by their inclined surfaces. When their end faces are flush, A complete cylinder is formed, and the diameter of the cylinder is smaller than the inner diameter of the hole where the annular groove of the inner hole is located; a radial probe is arranged on the cylindrical surface of the lower half-cylindrical wedge, and the radial probe is perpendicular to the axial projection line of the inclined plane and Located at the apex of the arc of the lower half cylindrical wedge profile, its height is greater than the depth of the annular groove in the inner hole, and its width is smaller than the width of the annular groove in the inner hole. 2. The auxiliary tool for measuring the depth of the annular groove in the inner hole according to claim 1, wherein the inclination angle of the inclined plane of the semi-cylindrical wedge is 5.711°.