On-line oil injection lubrication system for small-caliber cold pipe blank unit

Abstract

An on-line oil injection lubrication system of a small-caliber cold pipe blank unit comprises at least one intelligent oil supply assembly. The intelligent oil supply assembly comprises an upper industrial personal computer, a vector frequency converter and a hydraulic pump. The upper industrial personal computer adjusts the quantity of oil supplied by the hydraulic pump to the pipe blank inner hole oil injection assembly and/or the pipe blank outer surface oil injection assembly through the vector frequency converter. The on-line oil injection lubrication system can remarkably improve the quality of inner and outer surfaces of small-caliber stainless steel pipes and effectively solves various surface quality problems such as rolling burrs, rolling folds and micro-cracks caused by oil loss of the inner and outer surfaces of the small-caliber stainless steel pipes during the large-deformation rolling process.

What is claimed is: 
     
         1 . An on-line oil injection lubrication system of a small-caliber cold pipe blank unit, comprising a pipe blank inner hole oil injection assembly, a pipe blank outer surface oil injection assembly and at least one intelligent oil supply assembly, wherein the pipe blank inner hole oil injection assembly partially stretches into a pipe blank to inject oil into an inner hole of the pipe blank, a roller used for rolling the pipe blank is disposed on a front portion of the pipe blank, the pipe blank outer surface oil injection assembly is located outside the pipe blank and is used for injecting oil to a contact portion of the pipe blank and the roller, the pipe blank inner hole oil injection assembly comprises a mandrel rod and a mandrel, the mandrel is disposed in the inner hole of the pipe blank, the mandrel rod is connected to the mandrel, an oil passage is formed in the mandrel rod, an oil outlet part is disposed at an end of the mandrel, the oil passage is communicated with the oil outlet part, the pipe blank outer surface oil injection assembly comprises a support, an oil injection ring is movably mounted on the support, an oil injection channel is formed in the oil injection ring in an axial direction, multiple nozzles are connected to a front end of the oil injection channel, the intelligent oil supply assembly comprises an upper industrial personal computer, a vector frequency converter and a hydraulic pump, the hydraulic pump is connected to an oil tank, and the upper industrial personal computer adjusts the quantity of oil supplied by the hydraulic pump to the pipe blank inner hole oil injection assembly and/or the pipe blank outer surface oil injection assembly through the vector frequency converter. 
     
     
         2 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 1 , wherein the oil outlet part comprises multiple oil outlets which are obliquely arranged with respect to the axial direction, and exits of the oil outlets are located on a periphery of the mandrel. 
     
     
         3 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 2 , wherein the oil outlets are regularly arranged at intervals around a center of the mandrel, and the number of the oil outlets is three. 
     
     
         4 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 3 , wherein an oil injection cup is mounted at a left end of the mandrel rod, the oil injection cup is communicated with the oil passage and injects oil through the hydraulic pump, and a sealing shell is disposed outside the oil injection cup and is mounted in a pedestal. 
     
     
         5 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 4 , wherein a diameter of the mandrel gradually increases and then gradually decreases from left to right, and a top extension rod is connected to a right end of the mandrel. 
     
     
         6 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 1 , wherein the nozzles are arch flat nozzles, the number of the nozzles is three, and the nozzles are arranged close to each other and completely cover an outer side of the pipe blank. 
     
     
         7 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 1 , wherein the on-line oil injection lubrication system comprises one said intelligent oil supply assembly which supplies oil to the pipe blank inner hole oil injection assembly and/or the pipe blank outer surface oil injection assembly synchronously; or, the on-line oil injection lubrication system comprises one said intelligent oil supply assembly which supplies oil to the pipe blank inner hole oil injection assembly and the pipe blank outer surface oil injection assembly respectively. 
     
     
         8 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 7 , wherein the hydraulic pump delivers oil to the pipe blank inner hole oil injection assembly and the pipe blank outer surface oil injection assembly through an oil delivery pipe. 
     
     
         9 . The on-line oil injection lubrication system of a small-caliber cold pipe blank unit according to  claim 8 , wherein a pressure sensor used for detecting an internal pressure of the oil tank and a proximity switch used for detecting a liquid level in the oil tank are disposed in the oil tank.