CN107990803A - Screw hole system position detection device - Google Patents

Abstract

The invention discloses a threaded hole system position degree detection device, which comprises a disc-shaped bottom plate with a positioning axis formed in the center of the bottom surface, a positioning pin and a plurality of thread measuring pins; a plurality of uniformly distributed positioning holes are formed on the circumference of the bottom plate, A guide sleeve is arranged in the positioning hole; the positioning pin and a plurality of thread measuring pins are all inserted into the guide sleeve. The invention provides a thread measuring pin comprehensive gauge, in order to realize the accurate and rapid measurement of the position degree of the threaded hole system, convert the position degree of the threaded hole system into the position degree of the thread measuring pin, and solve the problem of direct measurement of the position degree of the threaded hole system Accuracy problem; the thread measuring pin is designed for thread detection part, which can detect whether the thread is qualified while detecting the position; the guide sleeve and the measuring pin are interchangeable. For different parts to be tested, as long as the thread holes are consistent, the guide sleeve and the It is applicable to all measuring pins; for workpieces that only need to be qualified, the measurement is faster.

Description

Screw hole system position detection device

technical field

The invention belongs to a position degree inspection device, in particular to a threaded hole system position degree detection device.

Background technique

Threaded holes are widely used in parts with assembly requirements such as flanges and cover plates, which usually have requirements for positional accuracy. At present, there are three detection methods for the position of the threaded hole system:

1. Use general-purpose measuring instruments such as vernier calipers. By detecting the center distance between the holes and the center distance between the holes and the center reference hole, according to the geometric relationship, the position degree value of the hole group is calculated. The measurement process and calculation process are relatively complicated, the production efficiency is low, and the precision is not high.

2. Use coordinate measuring device for detection. Due to the difficulty of picking points for the inner diameter of the threaded hole, it is impossible to directly measure the pitch diameter of the thread. Usually, a thread inspection tool (one end is a thread, the thread has a certain taper, and the other end is a cylinder) is used to assist in the quantitative detection of the position of the hole, but the detection cost is high and the time is long.

3. Apply comprehensive gauges. The small diameter of the thread is regarded as a through hole, and the detection method of the position of the through hole is used for reference. However, when the thread and the bottom hole are not in the same axis during tapping or the small diameter of the thread changes due to tapping extrusion, the detection error will become larger.

Contents of the invention

The present invention is proposed in order to overcome the shortcomings in the prior art, and its purpose is to provide a detection device for the position of threaded holes.

Technical scheme of the present invention is:

A device for detecting the position of a threaded hole system, comprising a disc-shaped bottom plate with a positioning axis formed at the center of the bottom surface, positioning pins and a plurality of thread measuring pins; a plurality of uniformly distributed positioning holes are formed on the bottom plate along the circumference, and the positioning holes are set There is a guide bush; the positioning pin and several threaded measuring pins are inserted into the guide bush.

The positioning hole is a two-step stepped hole with a large top and a small bottom.

The guide sleeve is a hollow stepped shaft structure, and the outer diameter of the upper end is larger than the outer diameter of the lower end.

The lengths of the large-diameter end and the small-diameter end of the guide sleeve are in one-to-one correspondence with the lengths of the large-diameter section and the small-diameter section of the positioning hole, and the outer diameter of the guide sleeve closely matches the inner diameter of the positioning hole.

The quantity of the thread measuring pins is the number of positioning holes minus one.

The number of positioning holes is consistent with the number of threaded holes on the workpiece to be measured.

The positioning pin is a stepped shaft structure whose outer diameter gradually decreases, and its lower end matches the small diameter of the threaded hole of the workpiece to be measured.

The thread measuring pin is a stepped shaft structure formed from bottom to top by a thread detection part, a position degree detection part and a handle part.

The surface of the handle is knurled.

The beneficial effects of the present invention are:

The invention provides a thread measuring pin comprehensive gauge, in order to realize the accurate and rapid measurement of the position degree of the threaded hole system, convert the position degree of the threaded hole system into the position degree of the thread measuring pin, and solve the problem of direct measurement of the position degree of the threaded hole system Accuracy problem; the thread measuring pin design thread detection part, can detect whether the thread is qualified while detecting the position; the guide sleeve and the measuring pin are interchangeable, for different parts to be tested, as long as the threaded holes are consistent, the guide sleeve and the measuring pin are interchangeable. It is applicable to all measuring pins; for workpieces that only need to be qualified, the measurement is faster.

Description of drawings

Fig. 1 is a structural representation of the present invention's use state;

Fig. 2 is a schematic structural view of a workpiece to be tested in an embodiment of the present invention.

in:

1 Locating pin 2 Thread measuring pin

3 Guide bush 4 Base plate

5 Workpiece to be measured 6 Positioning axis.

Detailed ways

The following is a detailed description of the threaded hole system position detection device of the present invention in combination with the drawings and embodiments of the specification:

As shown in Figure 1, a threaded hole system position detection device includes a disc-shaped bottom plate 4 forming a positioning shaft 6 in the center of the bottom surface, a positioning pin 1 and a plurality of thread measuring pins 2 (three in this embodiment); A plurality of evenly distributed positioning holes are formed on the bottom plate 4 along the circumference, and guide sleeves 3 are arranged in the positioning holes; the positioning pin 1 and the plurality of thread measuring pins 2 are all inserted into the guide sleeve 3 .

The positioning hole is a two-step stepped hole with a large top and a small bottom.

The guide sleeve 3 is a hollow stepped shaft structure, and the outer diameter of the upper end is larger than the outer diameter of the lower end.

The lengths of the large-diameter end and the small-diameter end of the guide sleeve 3 are in one-to-one correspondence with the lengths of the large-diameter section and the small-diameter section of the positioning hole, and the outer diameter of the guide sleeve 3 closely matches the inner diameter of the positioning hole.

The quantity of the thread measuring pins 2 is the number of positioning holes minus one.

The number of positioning holes is consistent with the number of threaded holes on the workpiece 5 to be measured.

The positioning pin 1 is a stepped shaft structure whose outer diameter gradually decreases, and its lower end matches the small diameter of the threaded hole of the workpiece 5 to be measured.

The thread measuring pin 2 is a stepped shaft structure formed from bottom to top by a thread detection part, a position detection part and a handle part.

The surface of the handle is knurled.

The positioning shaft 6 of the base plate 4 is in clearance fit with the reference hole of the workpiece 5 to be measured, and the lower end surface of the base plate 4 is attached to the upper end surface of the workpiece 5 to be measured.

As shown in Figure 2, the elements to be measured in this embodiment are the positional degrees of the three threaded holes relative to the reference A, and the tolerance principle is the maximum physical requirement.

The invention consists of a positioning part, a guiding part and a measuring part. According to the principle of maximum entity, the position degree of the threaded hole system is converted into the position degree of the thread measuring pin through indirect measurement.

The positioning part follows the principle of datum coincidence, and adopts the combination of two pins and one side for positioning. Consists of a base plate with centering shaft and a threaded hole dowel. The positioning axis is positioned on the central reference element, and the positioning pin is positioned in a threaded hole. The upper surface of the bottom plate is a positioning surface, which fits with the part to be tested, so as to ensure that the workpiece is completely positioned during the detection process. The middle part of the positioning pin 1 is matched with the guide sleeve 3. The size is designed according to GB/T8069-1988, the lower part of the positioning pin 1 is coaxial with the middle part, and matches with the small diameter of the threaded hole to ensure the complete positioning of the workpiece.

The guide part is a set of guide sleeves, the number of which is consistent with the measured threaded holes. The outer elements of the guide sleeve are matched with the bottom plate, and the inner hole of the guide sleeve is ground. Its shape is designed according to the workpiece and the bottom plate. The inner elements are used to determine whether the position of the thread measuring pin is qualified or not. The position degree between the guide sleeves is required to be less than 1/10 of the measured element.

The measuring part is a set of thread measuring pins. The measuring pins consist of three parts, from bottom to top, they are the thread detection part, the position detection part and the hand-held part. The surface of the hand-held part is knurled. The threaded part of the thread measuring pin 2 is designed according to the general gauge of the thread gauge, and is used to detect the thread; the middle part of the thread measuring pin 2 is coaxial with the threaded part, cooperates with the guide sleeve 3, and the size is the same as the middle part of the positioning pin 1, and the upper hand-held part is knurled handle for screwing in.

The usage method of the present invention:

When in use, the positioning shaft 6 of the bottom plate 4 with the guide sleeve 3 is inserted into the reference hole of the workpiece 5 to be measured, and the end surface is attached to the workpiece 5 to be measured, and the positioning pin 1 is inserted into a threaded hole along the guide sleeve 3 . After complete positioning, screw the threaded measuring pins 2 into the remaining threaded holes in turn. If all of them are screwed in, the measured workpiece 5 is qualified. If any measuring pin cannot be screwed in, the measured workpiece 5 is unqualified.

This example illustrates a form of the device and a specific method of use. The elements to be measured can be in other forms, and this type of device can be used for measurement when the directions of the threaded holes are consistent.

The invention provides a thread measuring pin comprehensive gauge, in order to realize the accurate and rapid measurement of the position degree of the threaded hole system, convert the position degree of the threaded hole system into the position degree of the thread measuring pin, and solve the problem of direct measurement of the position degree of the threaded hole system Accuracy problem; the thread measuring pin is designed for thread detection part, which can detect whether the thread is qualified while detecting the position; the guide sleeve and the measuring pin are interchangeable. For different parts to be tested, as long as the thread holes are consistent, the guide sleeve and the It is applicable to all measuring pins; for workpieces that only need to be qualified, the measurement is faster.

Claims (9)

1. A threaded hole system position detection device, characterized in that: it includes a disc-shaped bottom plate (4) forming a positioning shaft (6) in the center of the bottom surface, a positioning pin (1) and a plurality of thread measuring pins (2); A plurality of evenly distributed positioning holes are formed on the bottom plate (4) along the circumference, and guide sleeves (3) are arranged in the positioning holes; positioning pins (1) and multiple thread measuring pins (2) are inserted into the guide sleeves (3) . 2. The device for detecting the position of a threaded hole system according to claim 1, wherein the positioning hole is a two-step stepped hole with a large top and a small bottom. 3. A threaded hole system position detection device according to claim 1, characterized in that: the guide sleeve (3) is a hollow stepped shaft structure, and the outer diameter of the upper end is larger than the outer diameter of the lower end. 4. A threaded hole position detection device according to claim 1, characterized in that: the length of the large-diameter end and the small-diameter end of the guide sleeve (3) is the same as the length of the large-diameter section and the small-diameter section of the positioning hole One-to-one correspondence, and the outer diameter of the guide sleeve (3) closely matches the inner diameter of the positioning hole. 5 . The device for detecting the position of a threaded hole system according to claim 1 , wherein the number of the threaded measuring pins ( 2 ) is equal to the number of positioning holes minus one. 6 . 6 . The device for detecting the position of threaded holes according to claim 1 , wherein the number of positioning holes is the same as the number of threaded holes on the workpiece ( 5 ) to be tested. 7 . 7. A threaded hole system position detection device according to claim 1, characterized in that: the positioning pin (1) is a stepped shaft structure with a gradually decreasing outer diameter, and its lower end is in contact with the measured workpiece (5) The small diameter of the threaded hole fits. 8. A threaded hole system position degree detection device according to claim 1, characterized in that: the thread measuring pin (2) is formed from bottom to top by a thread detection part, a position degree detection part and a handle part Stepped shaft structure. 9. The device for detecting the position of a threaded hole system according to claim 8, characterized in that: the surface of the handle is knurled.