CN215370557U - Double-thread anti-loose bolt - Google Patents

Abstract

The utility model discloses a double-thread anti-loose bolt, which is characterized by comprising the following components in parts by weight: double-threaded bolt, double-threaded female nut and double-threaded male nut. The thread section of the double-thread bolt is provided with a concave external thread. The double-thread female nut is provided with two sections of internal threads with different nominal diameters. The inner side of the central round hole of the double-thread convex nut is provided with a convex internal thread, and the boss part of the double-thread convex nut is provided with an external thread. The double-thread male nut and the double-thread female nut are installed on the thread section of the double-thread bolt, the convex internal thread on the inner side of the double-thread male nut is correspondingly screwed with the concave external thread of the double-thread bolt, the external thread of the boss part of the double-thread male nut is correspondingly screwed with the large nominal diameter internal thread of the double-thread female nut, and the small nominal diameter internal thread of the double-thread female nut is correspondingly screwed with the thread of the double-thread bolt. The anti-loosening method of the double-thread anti-loosening bolt can effectively control the pre-tightening force of the bolt in a constant and effective range, prevent the bolt and the nut from loosening and lock the state of the bolt and the nut.

Description

Double-thread anti-loose bolt

Technical Field

The utility model relates to the field of machinery, in particular to a double-thread anti-loosening bolt which is suitable for preventing bolt tightening failure caused by loosening of a fastener bolt due to vibration.

Background

The anti-loosening bolt is mainly used for controlling loosening and failure of a connecting part which runs under the condition of a vibration state, and particularly needs to take measures to prevent the normal running of the mechanical connecting part from being influenced by the loosening of the part in mechanical equipment such as mining machinery and the like under the vibration working state. The current common fastener anti-loosening methods generally include non-detachable anti-loosening solutions and friction-increasing anti-loosening solutions. The non-detachable anti-loosening scheme adopts modes of firmly welding, bonding or punching point riveting and the like to change detachable threaded connection into non-detachable threaded connection. In the non-detachable anti-loosening scheme, the fastener cannot be reused, is troublesome to operate, and is often used in certain important occasions requiring high anti-loosening performance and not needing to be detached. The anti-loosening scheme for increasing the friction force achieves the anti-loosening purpose by increasing the friction force between the threads or between the bolt head and the end surface of the nut. The locking scheme of increase frictional force does not receive the restriction in space, can dismantle repeatedly, but the reliability is relatively poor, after working for a certain time, can reduce locking effect because of reasons such as vibration. There is a need to design a connecting part locking component with a function of controlling loosening so as to ensure continuous and normal operation of a machine running under a vibration state. Therefore, how to realize a bolt fastening anti-loosening structure and a bolt fastening anti-loosening method which have good anti-loosening effect and relatively simple structure is a problem which needs to be solved urgently at present.

Disclosure of Invention

The utility model aims to provide a double-thread anti-loosening bolt which is effective in anti-loosening control and convenient to use.

In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a double thread check bolt which characterized in that double thread check bolt includes: double-thread bolts, double-thread female nuts and double-thread male nuts.

The thread section of the double-thread bolt is provided with a concave external thread, and the lead angle of the concave external thread is larger than that of the double-thread bolt.

The double-thread female nut is provided with two sections of internal threads with different nominal diameters, namely a small nominal diameter internal thread and a large nominal diameter internal thread. And the small nominal diameter internal thread of the double-thread female nut is correspondingly screwed with the thread of the double-thread bolt.

And convex internal threads are arranged on the inner side of the central circular hole of the double-thread convex nut and correspondingly screwed with the concave external threads of the double-thread bolt.

The double-thread male nut boss part is provided with an external thread, and the external thread of the boss part is correspondingly screwed with the internal thread with the large nominal diameter of the double-thread female nut.

The double-thread male nut and the double-thread female nut are sequentially screwed into the thread section of the double-thread bolt.

Further, the width of a concave external thread arranged on the thread section of the double-thread bolt is not more than the nominal diameter of the double-thread bolt; the depth of the concave external thread is not greater than 1/2 the nominal diameter of the double thread bolt.

The advantages of the utility model are as follows

1. The double threads are adopted for preventing the bolt from loosening, so that the pressing force applied to the connecting part can be effectively controlled, and the constant pressing force can be controlled within an effective range.

2. The double-thread male nut and the double-thread female nut are sequentially screwed into the thread section of the double-thread bolt. The convex internal thread of the double-thread convex nut is correspondingly screwed with the concave external thread of the double-thread bolt; the external thread of the boss part arranged on the double-thread male nut is correspondingly screwed with the internal thread with the large nominal diameter of the double-thread female nut; the small nominal diameter internal thread of the double-thread female nut is correspondingly screwed with the thread of the double-thread bolt. The double-thread male nut, the double-thread female nut and the double-thread bolt are mutually screwed through threads to form a double-thread locking structure, so that the bolt is ensured not to be loosened.

3. The simple operation during part installation, maintenance and maintenance directly through to the operation of two screw thread female nuts screw in or screw out, alright realization installation or dismantlement.

In conclusion, the double-thread anti-loosening structure and the method can control the pre-tightening force of the bolt within a constant and effective range, so that the connecting part running in a vibration state is effectively connected and works safely and normally, the defects of various existing anti-loosening structures can be overcome, the anti-loosening effect is good, the manufacturing cost is low, the maintenance operation such as installation and disassembly is convenient, and the application prospect is good.

Drawings

Fig. 1 is a schematic structural view of the double-thread check bolt of the present invention.

Fig. 2 is a plan view of a double-threaded bolt.

Fig. 3 is a top view of a double threaded bolt.

Fig. 4 is a plan sectional view of the double-threaded female nut.

Fig. 5 is a bottom view of the double threaded female nut.

Fig. 6 is a plan cross-sectional view of a double threaded male nut.

Fig. 7 is a top view of a double threaded male nut.

The parts numbers in the figures are as follows

A double-threaded bolt 1.

The bolt comprises a double-thread bolt thread 1-1 and a concave external thread 1-2.

A double threaded female nut 2.

Small nominal diameter internal threads 2-1 and large nominal diameter internal threads 2-2.

A double-threaded male nut 3.

Boss part external screw thread 3-1, convex internal screw thread 3-2.

Detailed Description

The following description of the embodiments of the utility model with reference to the drawings is intended to illustrate the general inventive concept and should not be taken as limiting the utility model. The accompanying drawings illustrate right-handed hexagonal bolt and nut, a single concave external thread, a single convex internal thread, and the tooth shapes of the concave external thread and the convex internal thread are rectangular.

Fig. 1 shows a schematic structural diagram of a double-thread anti-loose bolt, which comprises a double-thread bolt 1, a double-thread female nut 2 and a double-thread male nut 3.

Fig. 2 is a schematic structural diagram of a double-thread bolt 1, and a thread section of the double-thread bolt 1 is provided with concave external threads 1-2. The lead angle of the concave external thread 1-2 is larger than that of the thread 1-1 of the double-thread bolt.

Fig. 4 is a schematic structural view of the double-threaded female nut 2, and the double-threaded female nut 2 is provided with two sections of internal threads with different nominal diameters, namely a small nominal diameter internal thread 2-1 and a large nominal diameter internal thread 2-2.

Fig. 6 shows a schematic view of a double-threaded male nut 3, the boss portion of the double-threaded male nut 3 being provided with a boss portion external thread 3-1. The inner side of the central round hole of the double-thread convex nut 3 is provided with convex internal threads 3-2.

The double-thread convex nut 3 and the double-thread concave nut 2 are sequentially screwed into the thread section of the double-thread bolt 1, and the convex internal thread 3-2 of the double-thread convex nut 3 is correspondingly screwed with the concave external thread 1-2 of the double-thread bolt 1. The external thread 3-1 of the boss part of the double-thread male nut 3 is correspondingly screwed with the internal thread 2-2 with the large nominal diameter of the double-thread female nut 2. The small nominal diameter internal thread 2-1 of the double-thread female nut 2 is correspondingly screwed with the thread 1-1 of the double-thread bolt 1. The double-thread male nut 3, the double-thread female nut 2 and the double-thread bolt 1 are mutually screwed through threads.

When the connected part rotates anticlockwise due to vibration and presses the double-thread convex nut 3 outwards in the bolt axis direction, the double-thread convex nut 3 is forced to rotate and axially displace more than the double-thread concave nut 2 under the action of the concave external thread 1-2, and the double-thread concave nut 2 and the double-thread convex nut 3 are forced to mutually press, increase the friction force and realize self locking; meanwhile, two forces in opposite directions are generated on the double-thread female nut 2 by the threads 1-1 of the double-thread bolt 1 and the boss external threads 3-1 of the double-thread male nut 3 in the axial direction, so that the double-thread female nut 2 is in a locking state.

The method comprises the following steps

1. The double-threaded bolt 1 is inserted into a desired connecting member.

2. The convex internal thread 3-2 of the double-thread convex nut 3 is placed into the concave external thread 1-2 and screwed into the double-thread bolt 1 to be tightly attached to the connecting part.

3. The double-thread female nut 2 is screwed into the double-thread bolt 1, the double-thread female nut 2 is screwed and approaches to the required torque of the design, and the double-thread male nut 3 and the double-thread bolt 1 are mutually screwed with the double-thread female nut 2 through threads.

Therefore, the aim of fixing the double-thread female nut 2 to ensure that the connecting part can continuously, effectively and normally work in a vibration state can be fulfilled.

Disassembly can be achieved by screwing out the double-thread female nut 2.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (4)

1. The utility model provides a double thread check bolt which characterized in that double thread check bolt includes: the double-thread bolt comprises a double-thread female nut, a double-thread male nut and a double-thread bolt, wherein the double-thread male nut and the double-thread female nut are sequentially screwed in the double-thread bolt.

2. A double-threaded anti-loose bolt according to claim 1, characterized in that the double-threaded male nut is provided with two sections of internal threads with different nominal diameters, namely a small nominal diameter internal thread and a large nominal diameter internal thread.

3. A double-threaded anti-loose bolt according to claim 1, characterized in that the inner side of the central circular hole of the double-threaded male nut is provided with a male internal thread, and the boss portion of the double-threaded male nut is provided with an external thread.

4. A double-thread anti-loosening bolt according to claim 1, wherein the thread section of the double-thread bolt is provided with a concave external thread having a lead angle larger than that of the thread of the double-thread bolt; the width of the concave external thread is not more than the nominal diameter of the double-thread bolt; the depth of the concave external thread is not greater than 1/2 the nominal diameter of the double thread bolt.

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