A split type fastening device for crosshead parts

Abstract

The invention relates to the technical field of assembling parts and components of a piston type compressor, in particular to a split fastening device for a crosshead part. The split fastening devicefor the crosshead part comprises a crosshead body, a crosshead nut cap located at the upper end of the crosshead body and a longitudinal piston rod fixed in the crosshead nut cap. The split fasteningdevice for the crosshead part provided by the invention is inserted into an assembly groove in an external threaded connecting ring through a built-in steel plate provided with a fastening steel plateand is in threaded connection to the external threaded connecting ring by means of an external annular connecting cover to connect a fastening groove in the inner side face of the fastening steel plate and the surface of the crosshead nut cap in a clamping manner, so that the problem that the piston rod is likely to loosen under the circumstance that a small and medium-sized compressor is excessively great in reciprocating inertial force, long in working time and high in working strength is solved, and the continuous working safety and reliability of the compressor are improved effectively.

Description

technical field [0001] The invention relates to the technical field of assembling components of a piston compressor, in particular to a split fastening device for a crosshead component. Background technique [0002] In the connection between the connecting rod and the piston rod in the reciprocating compressor, a crosshead is often used for transitional connection, and the piston rod is connected to the connecting rod through the crosshead so that the piston rod will not be subject 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 connection m...

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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