Part fastening device with threaded plug-in type crosshead

Abstract

The invention relates to the technical field of piston type compressor assembly parts, in particular to a part fastening device with a threaded plug-in type crosshead. The part fastening device comprises a crosshead body, a crosshead nut and a longitudinally-arranged piston rod, and an upward-protruding outer thread supporting ring is arranged on the position, located on the periphery of the crosshead nut, of the upper surface of the crosshead body. According to the part fastening device with the threaded plug-in type crosshead, an inserting block is inserted into an inserting groove and a splicing block is inserted into a splicing groove so as to fix an outer fastening block and the outer thread supporting ring; through an inner thread fixing ring which is in threaded connection with theouter thread supporting ring, the outer fastening bock and the outer thread supporting ring as well as the outer fastening block and the crosshead body are fixed; and through a limiting groove in theouter fastening block, the crosshead nut is fastened and limited, so that the problem that a piston rod of a small-medium compressor is prone to being loose under the conditions that the reciprocatinginertial force is overlarge, the work time is long and the work strength is large is avoided, and the safety and the reliability of continuous work of the compressor are effectively improved.

Description

technical field [0001] The invention relates to the technical field of assembling components of a piston compressor, in particular to a fastening device with a threaded plug-in type cross head component. Background technique [0002] In the connection between the connecting rod and the piston rod in the reciprocating compressor, the crosshead is often used to over-connect, and the piston rod is connected to the connecting rod through the crosshead so that the piston rod will not be subjected to the side pressure brought by the connecting rod. This way the friction between the piston and the cylinder is minimal. Moreover, the crosshead and the piston rod can only move axially, which can make full use of the volume of the cylinder, and the method of controlling the lubricating oil is relatively simple, which increases the efficiency of the compressor. [0003] Although there are many ways to connect the piston rod and the crosshead in reciprocating compressors, most of the co...

AI Technical Summary

Problems solved by technology

[0004] In the traditional threaded connection, a double-nut locking system is usually composed of the piston rod, the crosshead nut and the crosshead body, and a stop washer is installed between the crosshead nut and the crosshead body to connect the crosshead nut and the crosshead body. The possibility of mutual movement between the crosshead bodies is minimized, so as to better lock the double-nut locking system, but the torque requirements for nut locking in double-nut locking are relatively high. If the locking torque is too large, it will damage the The thread causes the slide wire to loosen, and if the locking torque is small, the nut will not be tightened tightly, and it will also cause loosening. When bending the stop washer to make it tightly attached to the cross-head nut, it needs to be tapped with a hammer. During the tapping process It is very likely to damage the thread on the nut, thereby affecting the tightening of the nut

[0005] The working time of the compressor is generally very long, and the reciprocating inertial force is also relatively large. The double nut locking system will inevitably loosen under the action of the reciprocating inertial force for a long time, and a stop washer may stop the cross head nut in a short time. Mutual movement with the crosshead body, but under long-term and high-intensity work, the stop washer itself may be deformed and lose its effect

Once there is looseness between the piston rod and the crosshead, it will often cause major safety hazards, such as hitting the cylinder, generating an unbalanced moment, and accelerating the wear of the piston and cylinder, which may cause a tragedy of machine crash

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