CN110600837A

CN110600837A - Self-locking assembly and tuning device

Info

Publication number: CN110600837A
Application number: CN201910749272.4A
Authority: CN
Inventors: 张毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2019-12-20

Abstract

The invention relates to a self-locking assembly and a tuning device, wherein the self-locking assembly comprises a tuning screw and a fastener, the tuning screw comprises a first locking part, the first locking part is provided with a first thread, the interior of the fastener is hollow to form a locking channel, a second locking part is arranged in the locking channel, the second locking part is provided with a second thread, the tuning screw is inserted into the locking channel, and the major diameter of the first thread is larger than that of the second thread so as to lock the tuning screw in the locking channel; the tuning device comprises the self-locking assembly. The fastener is provided with a locking channel for the tuning screw to penetrate through, and the tuning screw is locked in the locking channel under the action of friction force after external torque is removed due to the fact that the major diameter of the first thread is larger than that of the second thread and the interference fit between the first thread and the second thread; the processing technology of the tuning screw and the fastener is simple, the processing cost and the processing difficulty of the self-locking assembly are reduced, the structural strength of the tuning screw is high, the tuning screw is not easy to break, and the service life of the self-locking assembly is prolonged.

Description

Self-locking assembly and tuning device

Technical Field

The invention relates to the technical field of radio frequency communication, in particular to a self-locking assembly and a tuning device.

Background

The existing radio frequency device is generally tuned by extending a tuning screw into a resonant cavity, and in the tuning process, a self-locking screw of the radio frequency device is screwed into a fastener for locking. The traditional tuning screw does not have self-locking capacity, and can be locked only by using a spanner locking nut, so that the use is inconvenient; although the self-locking screw has self-locking capacity, the self-locking screw can only be turned, the processing cost and the processing difficulty are higher, and the structural strength of the self-locking screw is weak and easy to break, so that the normal use of a radio frequency device is influenced.

Disclosure of Invention

The invention aims to provide a self-locking assembly and a tuning device, and aims to overcome the defects of high processing difficulty and high cost of the tuning device.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a self-locking assembly comprises a tuning screw and a fastener, wherein the tuning screw comprises a first locking portion, the first locking portion is provided with first threads, a locking channel is formed in the hollow interior of the fastener, a second locking portion is arranged in the locking channel, the second locking portion is provided with second threads, the tuning screw can be screwed into the locking channel, and the major diameter of the first threads is larger than that of the second threads, so that the tuning screw is locked in the locking channel.

In a preferred embodiment, the first thread and/or the second thread comprises a multi-segment sub-thread.

In a preferred embodiment, a smooth section is provided between adjacent sub-threads.

In a preferred embodiment, the tuning screw further comprises a tuning portion located at a lower end of the first locking portion.

In a preferred embodiment, the tuning part is a smooth polished rod.

In a preferred embodiment, the tuning screw is provided with a guide groove at its tip.

In a preferred embodiment, a stopping portion is further disposed in the locking channel, and the stopping portion is located at a lower end of the second locking portion.

In a preferred embodiment, the surface of the stopper is flat, and the inner diameter of the stopper is larger than the outer diameter of the tuning part and smaller than the major diameter of the first thread.

The invention also provides a tuning device which comprises the self-locking assembly and a resonant cavity, wherein the part of the tuning screw rod, which penetrates out of the locking channel, is inserted into the resonant cavity.

The invention has at least the following beneficial effects:

the fastening piece is provided with a locking channel for the tuning screw to penetrate through, the tuning screw is continuously screwed downwards in the locking channel under the action of torque applied to the tuning screw, and the tuning screw is locked in the locking channel under the action of friction force after external torque is removed because the major diameter of the first thread is larger than that of the second thread and the first thread is in interference fit with the second thread; the tuning screw and the fastener are simple in processing technology, the processing cost and the processing difficulty of the self-locking assembly are reduced, the tuning screw does not have a thin-wall structure, the structural strength is high, the self-locking assembly is not prone to fracture, and the service life of the self-locking assembly is prolonged.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of one embodiment of a tuning screw;

FIG. 2 is a schematic structural view of one embodiment of a fastener;

FIG. 3 is a cross-sectional schematic view of one embodiment of the self-locking assembly;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic structural view of another embodiment of a tuning screw;

fig. 6 is a schematic structural view of another embodiment of the self-locking assembly.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. The technical characteristics of the invention can be combined interactively on the premise of not conflicting with each other.

First embodiment

Referring to fig. 1 to 4, the self-locking assembly in the present embodiment includes a tuning screw 10 and a fastener 20, the tuning screw 10 includes a first locking portion 11, the first locking portion 11 is provided with a first thread 111 on an outer surface of the tuning screw 10, the fastener 20 is hollow inside to form a locking channel 21, and the tuning screw 10 can be inserted into the locking channel 21; a second locking part 22 is arranged in the locking channel 21, the second locking part 22 is provided with a second thread 221, the major diameter (nominal diameter) of the first thread 111 is larger than that of the second thread 221, after the tuning screw 10 is inserted into the locking channel 21, the first thread 111 and the second thread 221 are in interference fit, and a friction force is generated on a contact surface of the first thread 111 and the second thread 221; and applying torque to the tuning screw 10, enabling the tuning screw 10 to continuously rotate downwards in the locking channel 21, removing the torque, and locking the tuning screw 10 in the locking channel 21 to realize self-locking of the tuning screw 10.

The tuning screw 10 in the embodiment can be formed by cold heading, the first thread 111 can be processed by rolling teeth, and the tuning screw is suitable for mass production, and has low processing cost and processing difficulty; the tuning screw 10 has no thin-wall structure, high structural strength and is not easy to break, and the service life of the tuning screw 10 is prolonged.

The first thread 111 and the second thread 221 in this embodiment are both standard thread pitches, and the thread pitches are the same, and only through the matching between the major diameters of the first thread 111 and the second thread, interference connection is formed, and self-locking is generated.

The included angle of the tooth tips of the first threads 111 is smaller than 60 degrees, the small diameter and the middle diameter of the first threads 111 and the second threads 221 form clearance fit, the torque applied to the tuning screw 10 cannot be influenced by the tolerance of the small diameter and the middle diameter of the second threads 221, and the self-locking structure between the tuning screw 10 and the fastener 20 is stable.

The tuning screw 10 further includes a tuning part 12, the tuning part 12 is located at the lower end of the first locking part 11, the tuning part 12 in this embodiment is a smooth polished rod, and the outer diameter of the tuning part 12 is smaller than the inner diameter of the locking channel 21, so that the tuning part 12 can penetrate out from the lower end of the locking channel 21 and extend into the resonant cavity of the rf device for tuning. The surface of the tuning part 12 may also be threaded without affecting the movement of the tuning screw 10 in the locking channel 21.

The top end of the tuning screw 10 is also provided with a guide groove 13, the guide groove 13 is downwards sunken based on the axis of the tuning screw 10, the cross section of the guide groove 13 is matched with the shape of the screwdriver head, and the convenience of assembly between the tuning screw 10 and the fastener 20 is improved; for example, the guide groove 13 may be an inner hexagonal quincunx groove, the installation and self-locking of the tuning screw 10 may be completed by using an inner hexagonal quincunx bit, and the cross section of the guide groove 13 may be a straight shape, a cross shape, a triangle or a polygon.

A stopping part 23 is further arranged in the locking channel 21, the stopping part 23 is positioned at the lower end of the second locking part 22, the outer surface of the stopping part 23 is smooth, and the inner diameter of the stopping part 23 is smaller than the major diameter of the first thread 111 and larger than the outer diameter of the tuning part 12, so that the tuning part 12 can penetrate out from the lower end of the locking channel 21, and when the lower end of the first thread 111 is screwed to the stopping part 23, the stopping part 23 does not have a thread which can enable the tuning thread to be continuously screwed downwards, the tuning screw 10 is blocked, and the tuning screw 10 is prevented from falling into the resonant cavity from the locking channel 21, and the use of the self-locking assembly; the length of the stop 23 may be set to 0.2-0.5 mm.

When the tuning device is used, the tuning part 12 can be inserted into the locking channel 21 until the first thread 111 contacts with the second thread 221, the first thread 111 is screwed into the second thread 221 region through the matching of the screwdriver head and the guide groove 13, and the first thread 111 can be self-locked at different positions of the second thread 221 region, so that the length of the tuning part 12 inserted into the resonant cavity of the tuning device and the tuning frequency can be adjusted.

The fastener 20 may be a nut or a nut. The lengths of the first thread 111 and the second thread 221, the position of the first thread 111 on the tuning screw 10, and the position of the second thread 221 in the locking channel 21 can be selected according to actual requirements to adjust the distance that the tuning part 12 protrudes from the locking channel 21, i.e. the tuning depth. The torque strength and the self-locking strength between the first thread 111 and the second thread 221 can be adjusted by reasonably selecting the major diameters of the first thread 111 and the second thread 221. The tuning part 12 and the locking section, the second thread 221 and the stop part 23 are all integrally formed.

Second embodiment

The present embodiment is different from the first embodiment in that the first thread 111 in the present embodiment includes a multi-segment first sub-thread and/or the second thread 221 includes a multi-segment second sub-thread, and it is ensured that at least one group of the first sub-thread and the second sub-thread, or the first sub-thread and the second thread 221, or the first thread 111 and the second sub-thread have a self-locking relationship; the major diameter of the first sub-thread of at least one group is larger than that of the second sub-thread, or the major diameter of the first sub-thread is larger than that of the second sub-thread 221, or the major diameter of the first thread 111 is larger than that of the second sub-thread, so as to ensure the locking of the fastening piece 20 to the tuning screw 10.

And the adjacent first sub-threads and the adjacent second sub-threads are connected in a seamless mode, or smooth sections are arranged between the adjacent first sub-threads and the adjacent second sub-threads at intervals. The number of the first sub threads and the second sub threads and the arrangement relation of the first sub threads and the second sub threads are reasonably selected, so that the locking strength of the fastening piece 20 to the adjusting screw rod 10 can be adjusted, and the high processing flexibility is realized.

Referring to fig. 5 and 6, in the present embodiment, for example, the first thread 111 includes two segments of first sub-threads 1111, and the second thread 221 does not include a second sub-thread, a smooth segment 1112 is disposed between the two first threads 111, the major diameter of the upper first sub-thread 1111 is larger than that of the second thread 221, and the two first sub-threads are in interference fit, and the lower first sub-thread 1111 and the second thread 221 are adapted to each other, and can be in interference fit or clearance fit; the first sub-thread 1111 at the lower side plays a role in guiding or primarily fixing the tuning screw 10, and after the first sub-thread 1111 at the upper side is screwed into the locking channel 21, the first sub-thread 1111 at the upper side and the second sub-thread 221 are locked due to friction force, so that self-locking of the tuning screw 10 is realized.

The invention also provides a tuning device, which comprises the self-locking assembly and a resonant cavity, wherein a cover plate is arranged at the opening end of the resonant cavity, a fastening piece 20 in the self-locking assembly is arranged on the cover plate, a locking channel 21 is communicated with the resonant cavity, the part of the tuning part 12, which extends out of the lower end of the locking channel 21, is inserted into the resonant cavity, and the tuning frequency is adjusted by changing the extending length of the tuning part 12.

The tuning device can be a combiner or a filter, the size of the tuning device can be reduced after the self-locking assembly is applied, meanwhile, the debugging time is reduced, and the use performance of the tuning device is improved.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The self-locking assembly is characterized by comprising a tuning screw and a fastener, wherein the tuning screw comprises a first locking part, the first locking part is provided with a first thread, the inside of the fastener is hollow to form a locking channel, a second locking part is arranged in the locking channel, the second locking part is provided with a second thread, the tuning screw can be screwed into the locking channel, and the major diameter of the first thread is larger than that of the second thread, so that the tuning screw is locked in the locking channel.

2. The self-locking assembly of claim 1, wherein the first and/or second threads comprise multi-segment sub-threads.

3. The self-locking assembly of claim 2, wherein a smooth section is provided between adjacent sub-threads.

4. The self-locking assembly of any one of claims 1 to 3, wherein the tuning screw further comprises a tuning portion located at a lower end of the first locking portion.

5. The self-locking assembly of claim 4, wherein the tuning portion is a smooth surfaced polished rod.

6. The self-locking assembly of claim 1, wherein the tuning screw is provided with a guide slot at a top end thereof.

7. The self-locking assembly of claim 4, wherein a stop is further disposed in the locking channel, the stop being located at a lower end of the second locking portion.

8. The self-locking assembly of claim 7, wherein the stop portion has a flat surface and an inner diameter that is greater than an outer diameter of the tuning portion and less than a major diameter of the first thread.

9. A tuning assembly comprising the self-locking assembly of any one of claims 1 to 8, and further comprising a resonant cavity into which a portion of the tuning screw extending out of the locking passage is inserted.