Bolt and nut are common components in our machinery, as well as cylindrical threaded fasteners for bolts and nuts. The bolt needs to be matched with the nut to tighten and connect two parts with through holes. This type of connection is called bolt connection. However, a design called super bolt has recently been discovered to replace traditional nuts and bolts.
Will traditional bolts and nuts be phased out?
What is a super bolt?
Its device can be screwed onto a new or existing bolt, stud, screw, or shaft. Once in place, the actual tension of the bolt or stud can be achieved by tightening the push screw that surrounds the main thread one circle using a simple manual tool. The top push screw evenly transmits the pre tightening force to the main thread, thereby also transmitting it to the connecting piece. Super bolts, also known as multi-stage push connection fasteners, can pre tighten large workpieces without the need for special devices or tools and reliably prevent them from loosening.
However, even if ordinary bolts are processed to a greater extent, there will inevitably be a coaxiality error of about 0.01mm in the middle, which is the root cause of shear force. What is shear force? The two forces are perpendicular to the force surface and have opposite directions.
There is a pair of “split sleeves” on the super bolt cylinder, combined with conical double headed bolts and expanders. During the tightening process of the bolt, the split sleeves will expand and fill the inner hole, fundamentally eliminating shear force.
Upper bolt application scenarios:
The gasket is placed at the center of the thread
Ensure that the gasket is not placed on the edge of the bottom cut or within the radius range of the mating bolt.
An additional washer or a large washer is necessary to transfer the bolt load to the support surface.
When the material strength of the connector is low, a thick, larger washer or additional washer is needed.
An additional spacer may be needed to allow the tensioner to approach the end of the screw.
A tensioner with a large circle of push screws needs to be correctly tightened through the push screws.
Composition and anti loosening principle of multi-stage push connection fastener: The multi-stage push connection fastener is composed of cylindrical double head bolts, anti loosening self-locking nuts, super washers, multi-stage push screw sleeves, and multi-stage push bolts. The super gasket is placed on the screw or bolt, and the anti loosening self-locking nut is screwed onto the screw or bolt through its screw hole; A cylindrical double head bolt, with a cylindrical center and threaded ends. One end of the thread is equipped with a super washer and an anti loosening self-locking nut, with the super washer installed on the inside and the anti loosening self-locking nut installed on the outside. On its cylindrical surface, multiple blind holes are drilled along the radial direction at equal angles, and 1 A special conical surface structure with a 5 ° angle is equipped with a super gasket and a multi-stage push bolt sleeve on the other end thread of the cylindrical double head bolt. The super gasket is installed on the inner side, and the multi-stage push bolt sleeve is installed on the outer side. Above it is a multi-stage push bolt, and one end of the multi-stage push bolt is in contact with the super gasket.
The anti loosening feature of the multi-level push connection fastener is that there are at least 2 push bolt threaded through-holes (10) on the nut, and the push bolt threaded through-hole (10) is screwed in with a push bolt (1). The problem of anti loosening of multi-stage push connection fasteners has long existed: various types of bolt connections are widely used in various mechanical transmission equipment and equipment installations. Through extensive research on the connection technology of new types of bolts both domestically and internationally, a comparison was made between traditional hinged hole bolts and hydraulic bolts, and it was found that:
1) Traditional hinge hole bolts have disadvantages such as difficult processing, high labor intensity, low processing accuracy, reduced assembly quality, difficult installation and disassembly, and poor interchangeability;
2) Hydraulic bolts have disadvantages such as the need for specialized tooling, large external dimensions, large installation and disassembly space requirements, high processing requirements, and complex processing technology. Many connecting parts have limited space, compact equipment layout, and must also use tight fitting bolts, which are very difficult to process, install, and disassemble, directly affecting the quality of mechanical equipment installation and normal maintenance. During the dismantling process of mechanical equipment, it is easy for the connecting bolts to lock in the screw holes, and it is necessary to use a thorough destructive method to process the tight fitting bolts. Many large equipment’s tight fitting bolts have a larger diameter, which can cause the screw holes to become rough during disassembly. It is necessary to re hinge the bolt holes and research the bolts. The interchangeability of tight fitting bolts is poor, resulting in a significant waste of manpower and material resources. In many practical engineering projects, the installation space is limited, and the installation and removal of tight fitting bolts have become a relatively tricky problem.
Advantages of preventing loosening of multi-level push connection fasteners:
Accurate pre tightening force; Uniform tension; Rich elasticity; Easy to install and disassemble.
Post time: Jan-18-2024