阅读说明：本技术 一种复合双螺母防松螺栓 (Composite double-nut anti-loose bolt ) 是由 邬惠林 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种复合双螺母防松螺栓,包括上垫片、下垫片、上螺母、下螺母和螺丝,其特征是：螺丝包括一体制造成形的螺帽、上螺栓杆和下螺栓杆三部分,上螺栓杆的螺纹旋转方向与下螺栓杆的螺纹旋转方向正好相反,上螺栓杆的直径比下螺栓杆的直径略大一点,上螺母能直接穿过下螺栓杆拧在上螺栓杆的螺纹上；下螺母拧在下螺栓杆的螺纹上；螺丝螺栓杆的上下两部分的比例遵循以下原则：所述螺丝螺栓杆依此插入上垫片、上连接件、下连接件、下垫片后,再拧紧上螺母,此时上螺母尾部的最后部分并没有拧在上螺栓杆的螺纹上,而是悬空套在下螺栓杆的螺纹上,下螺母直接拧紧在上螺母上；最后通过高频冷焊机点焊1-2处,使上螺母和下螺母连接为一体。(The invention discloses a composite double-nut anti-loose bolt which comprises an upper gasket, a lower gasket, an upper nut, a lower nut and a screw, and is characterized in that: the screw comprises a nut, an upper bolt rod and a lower bolt rod which are integrally manufactured, the rotating direction of the thread of the upper bolt rod is just opposite to that of the thread of the lower bolt rod, the diameter of the upper bolt rod is slightly larger than that of the lower bolt rod, and an upper nut can directly penetrate through the lower bolt rod and is screwed on the thread of the upper bolt rod; the lower nut is screwed on the thread of the lower bolt rod; the proportion of the upper part and the lower part of the screw bolt rod follows the following principle: the screw bolt rod is inserted into the upper gasket, the upper connecting piece, the lower connecting piece and the lower gasket in sequence, and then the upper nut is screwed, at the moment, the rearmost part of the tail part of the upper nut is not screwed on the thread of the upper bolt rod but is hung on the thread of the lower bolt rod, and the lower nut is directly screwed on the upper nut; and finally, spot welding the 1-2 parts by a high-frequency cold welding machine to connect the upper nut and the lower nut into a whole.)

1. The utility model provides a compound double nut check bolt, includes gasket, lower gasket, last nut, lower nut and screw, characterized by:

the screw comprises a nut, an upper bolt rod and a lower bolt rod which are integrally manufactured, the rotating direction of the threads of the upper bolt rod is just opposite to the rotating direction of the threads of the lower bolt rod, the diameter of the upper bolt rod is slightly larger than that of the lower bolt rod, and the upper nut can directly penetrate through the lower bolt rod and be screwed on the threads of the upper bolt rod; the lower nut is screwed on the thread of the lower bolt rod; the proportion of the upper part and the lower part of the screw bolt rod follows the following principle: the screw bolt rod is inserted into the upper gasket, the upper connecting piece, the lower connecting piece and the lower gasket in sequence, and then the upper nut is screwed, at the moment, the rearmost part of the tail part of the upper nut is not screwed on the thread of the upper bolt rod but is hung on the thread of the lower bolt rod, and the lower nut is directly screwed on the upper nut; and finally, spot welding the 1-2 parts by a high-frequency cold welding machine to enable the upper nut and the lower nut to be connected into a whole through welding spots.

2. A composite double nut anti-loose bolt as defined in claim 1, characterized in that:

neither the upper nor the lower shim is required, or only one of them is required.

Technical Field

The invention relates to the field of mechanical fasteners, in particular to a composite double-nut anti-loose bolt.

Background

At present, the bolt structure easily causes the fixed equipment to become flexible because of the continuous vibration of equipment, and then causes equipment trouble and accident scheduling problem. The diameter of the existing Down's anti-loose bolt is variable and discontinuous, so the overall strength of the bolt is insufficient, the bolt is easy to break and is difficult to process; the existing check bolt has the defects of complex structure, complexity, unreliability, more parts, heavy weight, high cost and difficult mass production.

There are four types of threaded fasteners commonly used on the market for preventing loosening:

the first is friction lock. This is the case with the hadlock locknuts in japan. Eventually, the nut will loosen and the threaded coupling will fail.

The second way is mechanical anti-loosening. The relative rotation of the screw thread pairs is directly limited by a braking piece. Such as cotter pins, steel wires, and snap washers. This way the disassembly is inconvenient.

The third mode is rivet punch anti-loosening. After the screw is screwed down, the thread pair loses the characteristics of the kinematic pair by adopting methods such as punching, welding and the like so as to be connected into a non-detachable connection. The disadvantage of this approach is that the bolt can only be used once and is difficult to remove, necessitating destruction of the bolt to allow removal.

The first three types of anti-loosening methods mainly rely on the third person to perform anti-loosening, which mainly refers to friction.

The fourth mode is structure looseness prevention, and the application number CN2019114170640 double-nut same-diameter positive and negative bidirectional composite thread looseness prevention and anti-theft self-locking bolt adopts a reticular thread and multiple elastic self-locking structure looseness prevention. However, the same-diameter positive and negative bidirectional composite threads are not continuous and obviously weak due to the fact that the threads are mutually crossed, and therefore the practicability is poor.

Disclosure of Invention

In order to overcome the defects, the invention provides a composite double-nut anti-loose bolt.

The technical scheme adopted by the invention for realizing the purpose is as follows:

the utility model provides a compound double nut check bolt, includes gasket, lower gasket, last nut, lower nut and screw, characterized by:

the screw comprises a nut, an upper bolt rod and a lower bolt rod which are integrally manufactured, the rotating direction of the threads of the upper bolt rod is just opposite to the rotating direction of the threads of the lower bolt rod, the diameter of the upper bolt rod is slightly larger than that of the lower bolt rod, and the upper nut can directly penetrate through the lower bolt rod and be screwed on the threads of the upper bolt rod; the lower nut is screwed on the thread of the lower bolt rod; the proportion of the upper part and the lower part of the screw bolt rod follows the following principle: the screw bolt rod is inserted into the upper gasket, the upper connecting piece, the lower connecting piece and the lower gasket in sequence, and then the upper nut is screwed, at the moment, the rearmost part of the tail part of the upper nut is not screwed on the thread of the upper bolt rod but is hung on the thread of the lower bolt rod, and the lower nut is directly screwed on the upper nut; and finally, spot welding the 1-2 parts by a high-frequency cold welding machine to enable the upper nut and the lower nut to be connected into a whole through welding spots. The portable high-frequency cold welding machine is small and exquisite and portable at present, can be charged without an external power supply for use in the field, and is convenient and simple to use and fine in welding spot. The portable polisher is small and exquisite portable at present, and the accessible charges and need not external power supply and uses in the field, and convenient to use is simple, can polish rapidly and go up the solder joint of nut and lower nut, twists off nut and last nut again according to this, just can take out the screw to do not destroy the shank of bolt of screw, the screw can continue to use, and last nut and lower nut after the solder joint polished can also continue to use moreover.

Alternatively, neither the upper nor the lower shim is required, or only one of them is required.

The composite double-nut screw has the advantages that the structure is simple and reasonable, the requirement on production precision is low, the composite double-nut screw is screwed on the upper bolt rod thread and the lower bolt rod thread which are opposite in rotation direction, mutual restriction is realized, the anti-loosening effect is excellent, the overall strength of the bolt is high, the screw can be taken out only by firstly grinding welding points of the upper nut and the lower nut during disassembly and then screwing the lower nut and the upper nut down, the bolt rod of the screw is not damaged, and the upper nut and the lower nut after the welding points are ground can be continuously used.

Drawings

The invention is further described with reference to the following figures and implementations. Fig. 1 is a schematic view of the application of the present invention, and fig. 2 is a schematic view of a screw of the present invention.

In the figure, 1 is an upper nut, 2 is a lower nut, 3 is a nut, 4 is an upper bolt shank, 5 is a lower bolt shank, 6 is an upper washer, 7 is an upper connector, 8 is a lower connector, 9 is a lower washer, and 10 is a welding point.

Detailed Description

As shown in fig. 1, a composite double-nut anti-loose bolt comprises an upper gasket 6, a lower gasket 7, an upper nut 1, a lower nut 2 and a screw, and is characterized in that:

as shown in fig. 2, the screw comprises a nut 3, an upper bolt rod 4 and a lower bolt rod 5 which are integrally manufactured, the thread rotation direction of the upper bolt rod 4 is a clockwise screwing direction, the thread rotation direction of the lower bolt rod 5 is a counterclockwise screwing direction, the thread rotation direction of the upper bolt rod 4 is just opposite to the thread rotation direction of the lower bolt rod 5, the diameter of the upper bolt rod 4 is 5mm, the diameter of the lower bolt rod 5 is 4mm, the diameter of the upper bolt rod 4 is slightly larger than that of the lower bolt rod 5, and the upper nut 1 can directly penetrate through the lower bolt rod 5 and be screwed on the thread of the upper bolt rod 4; the lower nut 2 is screwed on the thread of the lower bolt rod 5; the proportion of the upper part and the lower part of the screw bolt rod follows the following principle: the screw bolt rod is inserted into the upper gasket 6, the upper connecting piece 7, the lower connecting piece 8 and the lower gasket 9 in sequence, and then the upper nut 1 is screwed, at the moment, the rearmost part of the tail part of the upper nut 1 is not screwed on the thread of the upper bolt rod 4 but is hung and sleeved on the thread of the lower bolt rod 5, and the lower nut 2 is directly screwed on the upper nut 1; and finally, spot welding the position 1 by a high-frequency cold welding machine to enable the upper nut 1 and the lower nut 2 to be connected into a whole through a welding spot 10. The portable high-frequency cold welding machine is small and portable at present, can be charged without an external power supply for use in the field, is convenient and simple to use, and has fine welding spots 10. The portable polisher of present is small and exquisite portable, and the accessible charges and need not external power supply and uses in the field, and convenient to use is simple, can polish rapidly and go up the solder joint 10 of nut 1 and lower nut 2, twists off nut 2 and last nut 1 according to this again, just can take out the screw to do not destroy the shank of bolt of screw, the screw can continue to use, and last nut 1 and lower nut 2 after solder joint 10 polished off can also continue to use moreover.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention without departing from the content of the present invention.