阅读说明：本技术 螺纹有效牙长量测装置 (Effective thread length measuring device ) 是由 姚学厚 李旭 李阳 盛祥东 陶生森 黄明硕 于 2021-08-26 设计创作，主要内容包括：本发明公开了一种螺纹有效牙长量测装置,包括螺丝托持块和限位挡块,所述待测量螺丝能够托持于螺丝托持块上侧表面上,限位挡块固定安装于螺丝托持块一侧,限位挡块上设有限位圆孔,所述限位圆孔的孔径等于待测量螺丝的螺纹有效牙径,待测量螺丝端部的束尾能够插设于所述限位圆孔内,待测量螺丝端部的有效牙止挡于限位块朝向螺丝托持块一侧的限位面上,本发明通过螺丝托持块对待测量螺丝进行托持,将待测量螺丝的束尾插入限位挡块上的限位圆孔内后,通过限位圆孔直径快速找到待测量螺丝的有效牙位置,进而有效提高量测的准确性,还可以缩短量测时间,对于品质的把控及生产效率有大幅提高。(The invention discloses a device for measuring the effective tooth length of a thread, which comprises a screw supporting block and a limit stop block, the screw to be measured can be supported on the upper side surface of the screw supporting block, the limit stop block is fixedly arranged on one side of the screw supporting block, a limit round hole is arranged on the limit stop block, the hole diameter of the limit round hole is equal to the effective tooth diameter of the thread of the screw to be measured, the binding tail of the end part of the screw to be measured can be inserted into the limit round hole, the effective tooth of the end part of the screw to be measured is stopped on the limit surface of the limit block facing one side of the screw supporting block, the screw to be measured is supported by the screw supporting block, after the binding tail of the screw to be measured is inserted into the limit round hole on the limit block, the effective tooth position of the screw to be measured is quickly found through the diameter of the limit round hole, therefore, the accuracy of measurement is effectively improved, the measurement time can be shortened, and the quality control and the production efficiency are greatly improved.)

1. A thread effective length measuring device is characterized in that: including screw support piece (1) and limit stop (2), treat that measuring screw (3) can hold in the palm on the screw support piece upside surface, limit stop fixed mounting in screw support piece one side is equipped with limit round hole (21) on the limit stop, the aperture of limit round hole equals the effective tooth footpath (F) of screw thread of the volume of measuring screw, and the bundle tail (33) of the volume of measuring screw tip can be inserted and locate in the limit round hole, the effective tooth (34) backstop of the volume of measuring screw tip is on spacing face (24) of limit block one side is held in the screw support to the stopper.

2. The thread effective thread length measuring device according to claim 1, wherein: the upper side surface of the screw supporting block is provided with a V-shaped groove (11), a screw to be measured is supported in the V-shaped groove, and the large diameter of the thread of the screw to be measured is in tangential contact with the side wall of the V-shaped groove.

3. The thread effective thread length measuring device according to claim 1, wherein: the screw supporting block is also provided with a through hole (6) coaxially opposite to the limiting round hole, and a screw to be measured can be inserted into the through hole.

4. A thread effective thread length measuring device according to claim 1, 2 or 3, wherein: the screw supporting block is made of magnetic materials and is further provided with a magnetic base (4), and the screw supporting block is fixedly installed on the magnetic base.

5. The thread effective thread length measuring device according to claim 4, wherein: the magnetic base is an electromagnet and is also provided with a power supply and a circuit switch, the power supply supplies power to the electromagnet, and the circuit switch can control the on-off of a circuit between the power supply and the electromagnet.

6. A thread effective thread length measuring device according to claim 1, 2 or 3, wherein: the magnetic force block (7) is further arranged and can be fixedly covered on one side, back to the screw supporting block, of the limiting round hole of the limiting stop block, and the magnetic force block and the end portion of the screw to be measured on the screw supporting block are attracted by magnetic force.

7. The thread effective thread length measuring device according to claim 6, wherein: the limit stop is made of magnetic materials, the magnetic block is an electromagnet, and the limit stop is further provided with a power supply and a circuit switch, wherein the power supply supplies power to the electromagnet, and the circuit switch can control the on-off of a circuit between the power supply and the electromagnet.

8. A thread effective thread length measuring device according to claim 1, 2 or 3, wherein: the screw is arranged on the limit stop block to avoid a through hole (22), a threaded hole (12) is formed in the side wall of the screw supporting block, a fastening screw (5) is further arranged, the fastening screw penetrates through the screw avoiding through hole of the limit stop block and is finally in threaded connection with the threaded hole in the side wall of the screw supporting block, and the limit stop block is tightly clamped between the head of the fastening screw and the side wall of the screw supporting block.

9. The thread effective thread length measuring device according to claim 8, wherein: the side wall of the screw supporting block is also provided with at least one positioning hole (13), the side wall of the limit stop is fixedly provided with at least one positioning column (23), and the positioning columns on the limit stop are inserted into the positioning holes on the side wall of the screw supporting block in a one-to-one correspondence manner.

10. The thread effective thread length measuring device according to claim 9, wherein: the locating holes and the locating columns are two and are symmetrically distributed on two sides of the threaded holes and the screw avoiding-position through holes respectively.

Technical Field

The invention relates to a thread machining technology, in particular to a device for measuring effective thread length of a thread.

Background

The screw is an indispensable industrial necessity in daily life, and the screw mainly has the function of connecting two workpieces together to play a role in fastening.

The screw has a plurality of categories according to the application, and a screw with a binding tail (namely, a section of unthreaded polished rod is added at the tail part of the screw) is a very common screw in practical application. The process from the starting to the full tooth is that the tooth shape is gradually plump, and the screw thread of the screw cannot be effectively meshed with the nut when the tooth is not plump. At this time, the thread length of the binding tail screw is not from the tail of the screw any more, and should be the distance from the thread starting position to the whole thread to the screw head, which is called the effective thread length. In general, we define this position as the half position of the tooth height, i.e. the effective tooth.

When the conventional binding tail screw is used for measuring the length of a thread, the B end needs to be manually found when a point is taken, namely, the position of half of the tooth height needs to be found.

To measure point B, it is necessary to measure the height dimension H and then find the position half the height. It is known that there is a certain error in measurement, and in order to find the point B, two dimensions need to be measured, and then there is an accumulated error. However, the two dimensions are required to be in a two-fold relationship, and the actual measurement cannot be completely accurate, and usually there is a predetermined allowable error. In summary, the accumulated error of the point taking of the point B is large, and the real condition of the screw cannot be fed back.

In order to obtain a tooth position with a half of the tooth height, the first measurement cannot be realized, the screw needs to be rotated for multiple times to obtain a point, the measurement efficiency is low, and the screw machining precision is difficult to guarantee.

Disclosure of Invention

In order to make up for the above deficiencies, the invention provides a thread effective thread length measuring device which can measure the effective thread length of a binding screw quickly and accurately.

The technical scheme adopted by the invention for solving the technical problem is as follows: the utility model provides a long measuring device of effective tooth of screw thread, includes screw support piece and limit stop, the volume of awaiting measuring the screw can be held in screw support on the side surface, and limit stop fixed mounting is equipped with spacing round hole in screw support piece one side on the limit stop in screw support piece one side, the aperture of spacing round hole equals the effective tooth footpath of the screw thread of the volume of measuring the screw, and the bundle tail of the volume of measuring the screw tip can be inserted and locate in the spacing round hole, the effective tooth backstop of the volume of measuring the screw tip is on the spacing face of stopper towards screw support piece one side.

As a further improvement of the invention, a V-shaped groove is formed on the upper side surface of the screw supporting block, the screw to be measured is supported in the V-shaped groove, and the major diameter of the thread of the screw to be measured is in tangential contact with the side wall of the V-shaped groove.

As a further improvement of the invention, the screw supporting block is also provided with a through hole coaxially opposite to the limit round hole, and the screw to be measured can be inserted into the through hole.

As a further improvement of the invention, the screw supporting block is made of a magnetic conductive material and is also provided with a magnetic base, and the screw supporting block is fixedly arranged on the magnetic base.

As a further improvement of the invention, the magnetic base is an electromagnet, and is also provided with a power supply and a circuit switch, wherein the power supply supplies power to the electromagnet, and the circuit switch can control the on-off of a circuit between the power supply and the electromagnet.

As a further improvement of the invention, the screw positioning device is also provided with a magnetic block, the magnetic block can be fixedly covered on one side of the limiting round hole of the limiting stop block, which is opposite to the screw supporting block, and the magnetic block is magnetically attracted with the end part of the screw to be measured on the screw supporting block.

As a further improvement of the invention, the limit stop is made of a magnetic material, the magnetic block is an electromagnet, and the limit stop is further provided with a power supply and a circuit switch, wherein the power supply supplies power to the electromagnet, and the circuit switch can control the on-off of a circuit between the power supply and the electromagnet.

As a further improvement of the invention, the limit stop is also provided with a screw avoiding through hole, the side wall of the screw supporting block is provided with a threaded hole, and the limit stop is also provided with a fastening screw, the fastening screw is inserted into the screw avoiding through hole of the limit stop and finally screwed with the threaded hole on the side wall of the screw supporting block, and the limit stop is tightly clamped between the head of the fastening screw and the side wall of the screw supporting block.

As a further improvement of the invention, at least one positioning hole is further arranged on the side wall of the screw supporting block, at least one positioning column is fixedly arranged on the side wall of the limit stop, and the positioning columns on the limit stop are correspondingly inserted into the positioning holes on the side wall of the screw supporting block one by one.

As a further improvement of the invention, the two positioning holes and the two positioning columns are respectively and symmetrically distributed at two sides of the threaded hole and the screw avoiding through hole.

The beneficial technical effects of the invention are as follows: the screw to be measured is supported by the screw supporting block, the tail of the screw to be measured is inserted into the limiting round hole in the limiting stop block, and then the effective tooth position of the screw to be measured is quickly found through the diameter of the limiting round hole, so that the measuring accuracy is effectively improved, the measuring time can be shortened, and the quality control and the production efficiency are greatly improved.

Drawings

FIG. 1 is a front view of a captive screw to be measured;

FIG. 2 is a perspective view of a first construction of the present invention;

FIG. 3 is a front view of a first configuration of the present invention;

FIG. 4 is a top view of a first structure of the present invention;

FIG. 5 is a right side view of a first construction of the present invention;

FIG. 6 is a perspective view of a first configuration of a screw retaining block;

FIG. 7 is a front view of a first configuration of a screw retaining block;

FIG. 8 is a perspective view of a positive stop;

FIG. 9 is a front view of the positive stop;

FIG. 10 is a right side view of the positive stop;

FIG. 11 is a schematic view of a first configuration of the present invention;

FIG. 12 is a schematic view of the major diameter of the thread and the effective thread diameter of the screw;

FIG. 13 is a perspective view of a second construction of the present invention;

FIG. 14 is a front view of a second construction of the present invention;

FIG. 15 is a top view of a second construction of the present invention;

FIG. 16 is a right side view of a second construction of the present invention;

FIG. 17 is a perspective view of a second configuration of a screw retaining block;

FIG. 18 is a front view of a second configuration of a screw retaining block;

FIG. 19 is a diagram illustrating a second measurement mode of the present invention.

Detailed Description

Example (b): the utility model provides a long measuring device of effective tooth of screw, includes that the screw holds in the palm piece 1 and limit stop 2, the volume of awaiting measuring screw 3 can hold in the support of screw 1 upside surface on, and limit stop 2 fixed mounting is in the screw and holds in the palm 1 one side, is equipped with spacing round hole 21 on the limit stop 2, the aperture of spacing round hole 21 equals the effective tooth footpath F of the screw thread of the volume of measuring screw 3, and the bundle tail 33 of the volume of measuring screw 3 tip can insert and locate in the spacing round hole 21, the effective tooth 34 backstop of the volume of measuring screw 3 tip is on the spacing face 24 of stopper towards screw support piece 1 one side.

The screw 3 to be measured is a revolution body, when the screw rotates a circle around the axis, the effective teeth 34 (the position of half of the tooth height) form a circle, the diameter of the circle formed by the effective teeth 34 is the effective thread diameter F of the screw thread, the effective thread diameter FF of the screw thread is D-H/2-H/2, wherein D is the major thread diameter, H is the thread height, for a single screw, the circle center of the circle formed by the effective teeth 34 coincides with the circle center of the major thread diameter D, and the diameter of the limit round hole 2121 on the limit stop 22 is made according to the diameter F of the circle formed by the effective teeth 34;

during measurement, a screw to be measured is placed on the screw supporting block 1, then the screw is pushed to the limit stop 2, and the screw cannot move any more after being pushed for a distance because the diameter of the limit round hole 21 is smaller than the major diameter of the screw thread and equal to the diameter of the circle formed by the effective teeth 34, namely the effective tooth diameter F of the screw thread. The position of the effective teeth 34 is then translated to the stop surface 24, at which time the length L of the effective teeth 34 can be measured.

The upper side surface of the screw supporting block 1 is provided with a V-shaped groove 11, the screw 3 to be measured is supported in the V-shaped groove 11, and the large diameter of the thread of the screw 3 to be measured is in tangential contact with the side wall of the V-shaped groove 11. The upper side surface of the screw supporting block 1 is provided with a V-shaped groove 11, and the V-shaped groove 11 is designed and processed to be tangent with the major diameter of the thread, and the tangent major diameter of the thread is superposed with the circle center of the limiting round hole 21. During measurement, a screw to be measured is placed in the V-shaped groove 11 of the screw supporting block 1, the large diameter of the thread is in contact with the V-shaped groove, and the screw 3 to be measured is automatically centered and coaxially aligned with the limiting circular hole 21.

The screw supporting block 1 is also provided with a through hole 6 coaxially opposite to the limiting round hole 21, and the screw 3 to be measured can be inserted into the through hole 6.

The screw supporting block 1 is made of a magnetic conductive material and is further provided with a magnetic base 4, and the screw supporting block 1 is fixedly installed on the magnetic base 4.

Through setting up magnetic base 4, after the screw 3 of awaiting measuring was put on screw holding piece 1, because the magnet effect, it can be adsorbed firmly on screw holding piece 1, ensures that it keeps stable positioning state on screw holding piece 1, ensures to measure accurately.

The magnetic base 4 is an electromagnet and is also provided with a power supply and a circuit switch, the power supply supplies power to the electromagnet, and the circuit switch can control the on-off of a circuit between the power supply and the electromagnet. Realize the location to the volume of awaiting measuring screw 3 through switching on for the electro-magnet, through cutting off the power supply for the electro-magnet, conveniently take off the volume of awaiting measuring screw 3 is light.

The magnetic block 7 is further arranged, the magnetic block 7 can be fixedly covered on one side, back to the screw supporting block 1, of the limiting round hole 21 of the limiting stop block 2, and the magnetic block 7 and the end portion of the screw 3 to be measured on the screw supporting block 1 are attracted by magnetic force.

The limit stop 2 is made of a magnetic conductive material, the magnetic block 7 is an electromagnet, and the limit stop is further provided with a power supply and a circuit switch, wherein the power supply supplies power to the electromagnet, and the circuit switch can control the on-off of a circuit between the power supply and the electromagnet. Realize the location to the volume of awaiting measuring screw 3 through switching on for the electro-magnet, through cutting off the power supply for the electro-magnet, conveniently take off the volume of awaiting measuring screw 3 is light.

The limiting stop block 2 is further provided with a screw avoiding through hole 22, the side wall of the screw supporting block 1 is provided with a threaded hole 12, and the limiting stop block 2 is further provided with a fastening screw 5, the fastening screw 5 penetrates through the screw avoiding through hole 22 of the limiting stop block 2 and is finally in threaded connection with the threaded hole 12 on the side wall of the screw supporting block 1, and the limiting stop block 2 is tightly clamped between the head of the fastening screw 5 and the side wall of the screw supporting block 1.

The side wall of the screw supporting block 1 is further provided with at least one positioning hole 13, the side wall of the limit stop 2 is fixedly provided with at least one positioning column 23, and the positioning columns 23 on the limit stop 2 are inserted into the positioning holes 13 on the side wall of the screw supporting block 1 in a one-to-one correspondence manner. When the limit stop 2 is assembled with the screw supporting block 1, the screw supporting block 1 and the limit stop 2 are matched with the positioning column 23 in a positioning mode through the positioning hole 13, then the fastening screw 5 penetrates through the screw avoiding through hole 22, the limit stop 2 is tightly connected with the screw supporting block 1, the assembling precision is guaranteed, and the limit round hole 21 and the V-shaped groove 11 are arranged in a centering mode.

The number of the positioning holes 13 and the positioning columns 23 is two, and the two positioning holes are symmetrically distributed on two sides of the threaded hole 12 and the screw avoiding through hole 22 respectively.