Knob anti-falling structure

Abstract

The invention relates to the technical field of knob falling prevention, in particular to a knob falling prevention structure which comprises a lining fixedly connected with a rotating shaft on a rotating device in an adhesive mode. And the turncap is fixedly connected to the bushing in a mechanical contact interlocking manner. The knob anti-falling structure provided by the invention has the following advantages: a) the design scheme is simple and easy to implement, and does not need complex process requirements; b) the conventional processing and manufacturing process is not changed, and the skill requirements on technicians are not improved; c) the device is suitable for fixing knobs on rotating shafts of rotating devices of various specifications without influencing the performance of the rotating devices; d) the anti-falling problem of the knob in the use process and in a vibration environment is effectively solved; and e) repeated disassembly and assembly of the turncap are not influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of knob anti-loosening, and in particular to a knob anti-loosening structure. Background Art

[0002] The knob has the advantages of simple operation and sensitive feedback. While providing a good user experience, it also gives the system fast information transmission, which is a better human-computer interaction mode. Knobs are widely used in various equipment and facilities in people's daily lives, such as table lamp gear knobs, switch knobs, car central control knobs, audio control knobs, brightness control knobs, etc. These knobs are usually composed of a screw cap and a potentiometer or encoder (hereinafter referred to as a rotary device). The rotary device is fixed to the structure, and the screw cap is fixed to the shaft of the potentiometer or encoder. In daily life, screw caps are mostly made of plastic or metal parts, and are generally fixed to the shaft of the rotary device by limit grooves and spring clips. Due to the friendly use environment in daily life, it is generally rare for the screw cap to loosen or fall off. Even if the screw cap falls off, it will not have a major impact.

[0003] In some applications with poor working conditions, such as industrial environments, the screw cap is generally made of metal, and the knob is mainly fixed by set screws and thread glue to prevent loosening. The shaft of the rotating component is usually D-shaped, which can be used to limit the rotation direction. The screw cap is generally made of metal and has a threaded hole on it. The D-shaped hole is designed to match the size of the rotating component shaft. Apply thread glue to the set screw and tighten the set screw. The set screw and the screw cap thread are tightened to squeeze the rotating component shaft. The pre-tightening force of the screw tightening product fixes the screw cap and the shaft together. In certain special application scenarios such as the aerospace field, there are harsh high and low temperature cycles and alternating vibration stress conditions. Since vibration and high and low temperature environments will weaken the pre-tightening force, multiple set screws are generally used to fix the screw cap, but this still cannot completely prevent the screw cap from loosening and falling off along the axial direction. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention proposes a knob anti-drop structure.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0006] A knob anti-drop structure, comprising:

[0007] The bushing is fixedly connected to the rotating shaft of the rotating device by gluing;

[0008] The screw cap is fixedly connected to the bushing by mechanical contact interlocking.

[0009] As a further improvement of the present invention, a gap for filling with structural adhesive is provided at the fitting position between the bushing and the rotating shaft.

[0010] As a further improvement of the present invention, a hole groove matching the bushing is provided inside the screw cap, and an anti-rotation structure is provided on the outside of the bushing and the inside of the hole groove.

[0011] As a further improvement of the present invention, the anti-rotation structure is any one of a D-shaped structure, a waist-shaped structure, and a square structure.

[0012] As a further improvement of the present invention, a through hole is provided on the side surface of the bushing, and a threaded hole is provided on the side surface of the screw cap. The threaded hole and the through hole are matched in position and their central axes are collinear.

[0013] As a further improvement of the present invention, set screws coated with thread glue are screwed into the through holes and the threaded holes.

[0014] As a further improvement of the present invention, a circular groove is provided on the side of the bushing, and a through-type threaded hole is provided on the side of the screw cap. The through-type threaded hole matches the circular groove in position and their central axes are collinear.

[0015] As a further improvement of the present invention, set screws coated with thread glue are screwed into the circular groove and the through-type threaded hole.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides a knob anti-dropout structure having the following advantages: a) the design of the invention is simple and easy to implement, without requiring complex process requirements; b) the conventional processing and manufacturing process is not changed, and the skill requirements for process personnel are not increased; c) it is suitable for fixing knobs on the rotating shafts of rotating devices of various specifications without affecting the performance of the rotating devices; d) it effectively solves the problem of anti-dropout of the knob during use and in a vibration environment; e) it does not affect the repeated disassembly and assembly of the rotary cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the bushing structure in Example 1 of the present invention;

[0020] Figure 2 Schematic diagram of the screw cap structure in Example 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the assembly structure of the bushing, the rotary cap and the rotating shaft in the first embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the bushing structure in the second embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the screw cap structure in the second embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the assembly structure of the bushing, the rotary cap and the rotating shaft in the second embodiment of the present invention.

[0025] In the figure: 1. Bushing; 11. Gap; 12. Through hole; 13. Circular groove; 14. Anti-rotation structure; 2. Screw cap; 21. Hole slot; 22. Threaded hole; 23. Through-type threaded hole; 3. Rotating shaft; 4. Set screw; 5. Structural adhesive; 6. Thread glue. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0027] A knob anti-drop structure mainly comprises a bushing 1 and a screw cap 2. Bushing 1 is fixedly connected to a rotating shaft 3 on a rotating component by adhesive bonding. The screw cap 2 is fixedly connected to bushing 1 by mechanical contact interlocking.

[0028] Example 1

[0029] like Figure 1 As shown, the bushing 1 is a rotating body structure, and the rotating shaft 3 on the rotating device is usually D-shaped. The interior of the bushing 1 is designed to be D-shaped to match the shape of the rotating shaft 3 to achieve rotation direction limitation. A gap 11 is provided at the fitting position between the bushing 1 and the rotating shaft 3, which is used to fill the structural adhesive, so that the bushing 1 and the rotating shaft 3 can be firmly bonded together. One or more through holes 12 are provided on the side of the bushing 1 for fixing the screw cap 2. An anti-rotation structure 14 is provided on the outside of the bushing 1, and the anti-rotation structure 14 can be D-shaped, waist-shaped, or square. In this embodiment, the anti-rotation structure 14 is designed to be a D-shaped structure, and the length dimension of the anti-rotation structure 14 is the same as the axial length dimension of the bushing 1.

[0030] like Figure 2 As shown, the interior of screw cap 2 is provided with a slot 21 that matches the shape of bushing 1. The outer dimensions of screw cap 2 should be smaller than the inner diameter of the thread that secures the rotating component. The side of screw cap 2 is provided with threaded holes 22. The number of threaded holes 22 matches the number of through holes 12. The installation position of screw cap 2 is unique and the central axes are collinear.

[0031] like Figure 3As shown, during installation, first install the bushing 1 on the rotating shaft 3 on the rotating device, and fill the gap 11 with structural glue. The structural glue is used to permanently bond the bushing 1 to the rotating shaft 3 on the rotating device. It cannot be disassembled and is resistant to high and low temperatures and vibration. Then install the screw cap 2 on the bushing 1. After installation, the threaded hole 22 corresponds to the position of the through hole 12. The set screw 4 coated with thread glue 6 is installed into the threaded hole 22 of the screw cap 2, passes through the through hole 12 of the bushing 1, and is fastened to the rotating shaft 3 on the rotating device. The thread glue 6 is filled between the threads of the screw cap 2 and the set screw 4, and is a detachable thread glue. Then, apply sealing glue to the outer end of the set screw 4 to prevent the set screw 4 from loosening and moving backward. Due to the presence of the through hole 12 on the bushing 1, even if the tightening preload of the set screw 4 disappears, the side wall of the through hole 12 on the bushing 1 can prevent the screw cap 2 from loosening and falling off axially.

[0032] This embodiment features multiple anti-loosening features: a) thread sealant 6, b) sealing compound, and c) bushing 1. Even if the thread sealant loosens and the thread preload is lost, the sealing compound prevents the set screw 4 from moving backward, while the sidewalls of the through hole 12 in the bushing 1 still secure the screw cap 2.

[0033] Example 2

[0034] like Figure 4 As shown, the bushing 1 is a rotating body structure, and the rotating shaft 3 on the rotating device is usually D-shaped. The interior of the bushing 1 is designed to be D-shaped to match the shape of the rotating shaft 3 to achieve rotation direction limitation. A gap 11 is provided at the fitting position between the bushing 1 and the rotating shaft 3, which is used to fill the structural adhesive, so that the bushing 1 and the rotating shaft 3 can be firmly bonded together. One or more through holes 12 are provided on the side of the bushing 1 for fixing the screw cap 2. An anti-rotation structure 14 is provided on the outside of the bushing 1, which can be D-shaped, waist-shaped, or square. In this embodiment, the anti-rotation structure 14 is designed to be a D-shaped structure, and the length dimension of the anti-rotation structure 14 is smaller than the length dimension of the bushing 1, forming an anti-rotation concave platform. A circular groove 13 is also provided on the side of the bushing 1, and the diameter of the circular groove 13 matches the selected set screw 4.

[0035] like Figure 5 As shown, the interior of the screw cap 2 is provided with a hole groove 21 that matches the shape of the bushing 1 and serves as an anti-rotation boss that matches the anti-rotation recess on the bushing 1. The outer dimensions of the screw cap 2 should be smaller than the inner diameter of the thread for mounting and fixing the rotating device. The side of the screw cap 2 is provided with threaded holes 22. The number of threaded holes 22 matches the number of through holes 12, and the installation position is unique and the central axis is collinear. The side of the screw cap 2 is provided with a through-threaded hole 23. The axis of the through-threaded hole 23 is collinear with the circular groove 13 on the bushing 1, and the diameter matches the selected set screw 4.

[0036] like Figure 6As shown, during installation, first install the bushing 1 on the rotating shaft 3 on the rotating device, and fill the gap 11 with structural glue. The structural glue is used to permanently bond the bushing 1 to the rotating shaft 3 on the rotating device. It cannot be disassembled and is resistant to high and low temperatures and vibration. Then install the screw cap 2 on the bushing 1. After installation, the threaded hole 22 corresponds to the position of the through hole 12. The set screw 4 coated with thread glue 6 is installed into the threaded hole 22 of the screw cap 2, passed through the through hole 12 of the bushing 1, and fastened to the rotating shaft 3 on the rotating device. The thread glue 6 is filled between the threads of the screw cap 2 and the set screw 4, which is a detachable thread glue. Then, apply sealing glue to the outer end of the set screw 4 to prevent the set screw 4 from loosening and moving backward; install the set screw 4 coated with thread glue 6 into the through-type threaded hole 23 on the screw cap and pass through the circular groove 13 on the bushing 1, and then apply sealing glue to both ends of the through-type threaded hole 23.

[0037] In this embodiment, the screw cap 2 is restricted from axial loosening by the set screw 4 at the through-threaded hole 23 on the screw cap 2, and is fastened by the set screw 4 at the through-hole 12 on the bushing 1. At the same time, thread glue 6 is applied to prevent loosening, and sealing glue is applied to prevent falling off.

[0038] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and description merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A knob anti-drop structure, characterized by: include: A bushing (1) is fixedly connected to a rotating shaft (3) on a rotating device by means of adhesive connection; The screw cap (2) is fixedly connected to the bushing (1) by a mechanical contact interlocking method.

2. The knob anti-drop structure according to claim 1, characterized in that: A gap (11) for filling with structural adhesive is provided at the fitting position between the bushing (1) and the rotating shaft (3).

3. The knob anti-drop structure according to claim 2, characterized in that: The interior of the screw cap (2) is provided with a hole groove (21) matching the bushing (1), and the exterior of the bushing (1) and the interior of the hole groove (21) are provided with an anti-rotation structure (14).

4. The knob anti-drop structure according to claim 3, characterized in that: The anti-rotation structure (14) is any one of a D-shaped structure, a waist-shaped structure, and a square structure.

5. The knob anti-drop structure according to claim 3, characterized in that: A through hole (12) is provided on the side of the bushing (1), and a threaded hole (22) is provided on the side of the screw cap (2). The threaded hole (22) and the through hole (12) are matched in position and their central axes are collinear.

6. The knob anti-drop structure according to claim 5, characterized in that: A set screw (4) coated with thread glue (6) is screwed into the through hole (12) and the threaded hole (22).

7. The knob anti-drop structure according to claim 3, characterized in that: A circular groove (13) is provided on the side of the bushing (1), and a through-type threaded hole (23) is provided on the side of the screw cap (2). The through-type threaded hole (23) matches the circular groove (13) in position and their central axes are collinear.

8. The knob anti-drop structure according to claim 7, characterized in that: A set screw (4) coated with thread glue (6) is screwed into the circular groove (13) and the through-type threaded hole (23).

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