Feeding device for liquid materials

Abstract

A feeding device for liquid raw materials includes a storage tank and a hydraulic cylinder. The storage tank includes an outer tube, an inner tube, a receiving space, a front cap and a rear cap. The inner tube is mounted coaxially in the outer tube. The receiving space is defined between the inner and outer tubes. The front cap is mounted on the inner and outer tubes and has a feeding inlet communicating with the inner tube and a front outlet communicating with the receiving space. The rear cap is mounted on the inner and outer tubes and has a rear inlet communicating with the receiving space. The hydraulic cylinder has a piston rod and a piston connected to the piston rod and mounted movably in the inner tube. Thus, the feeding device is simplified and quiet and can be used to transport materials of different viscosities.

1 . A feeding device for liquid materials comprising
 a storage tank comprising
 an outer tube having
 a front end; and 
 a rear end; 
 
 an inner tube being mounted coaxially in and being spaced from the outer tube and having
 a front end; and 
 a rear end; 
 
 a receiving space being defined between the inner and outer tubes; 
 a front cap being mounted on the front ends of the inner and outer tubes and having
 a feeding inlet being defined in the front cap and communicating with the inner tube; and 
 a front outlet being defined in the front cap and communicating with the receiving space; and 
 
 a rear cap being mounted on the rear ends of the inner and outer tubes and having a rear inlet defined in the rear cap and communicating with the receiving space; and 
   a hydraulic cylinder being connected to the storage tank and having
 a piston rod being mounted through the rear cap and extending into the inner tube; and 
 a piston being connected to the piston rod and being mounted movably in the inner tube. 
   
   
   
       2 . The feeding device for liquid materials as claimed in  claim 1 , wherein
 the feeding device comprises multiple storage tanks connected coaxially in series;   the piston rod of the hydraulic cylinder extends into the inner tubes of the storage tanks; and   multiple pistons are connected to the piston rod and are mounted respectively in the inner tubes of the storage tanks.   
   
   
       3 . The feeding device for liquid materials as claimed in  claim 2 , wherein the rear cap of each storage tank further has a gas opening defined through the rear cap and communicating with the inner tube of the storage tank. 
   
   
       4 . The feeding device for liquid raw materials as claimed in  claim 1 , wherein the rear cap further has a gas opening defined through the rear cap and communicating with the inner tube.