초록 ▼

A wet blasting machine for permitting deburring of workpieces by utilizing a slurry of water and abrasive particles. The slurry is discharged by a blasting gun against the workpiece, and is then collected within a reclaiming tank. The top water flows from the reclaiming tank into an intermediate set

A wet blasting machine for permitting deburring of workpieces by utilizing a slurry of water and abrasive particles. The slurry is discharged by a blasting gun against the workpiece, and is then collected within a reclaiming tank. The top water flows from the reclaiming tank into an intermediate settling tank, and the top water is then withdrawn therefrom into a clear water tank. A multiple-section reciprocating pumping unit supplies pressurized water from the clear water tank to the blasting gun, which sucks slurry to the gun from an abrasive particle reservoir located approximately at or above the elevation of the gun. The abrasive particles are supplied to the reservoir from the reclaiming tank.

대표청구항 ▼

In a wet blasting machine for deburring, said machine having means defining therein a blasting chamber, blasting gun means positioned within said chamber for discharging a slurry of water and abrasive particles against a workpiece, a reclaiming tank located below the blasting chamber for collecting

In a wet blasting machine for deburring, said machine having means defining therein a blasting chamber, blasting gun means positioned within said chamber for discharging a slurry of water and abrasive particles against a workpiece, a reclaiming tank located below the blasting chamber for collecting therein the slurry, a clear water tank containing therein a quantity of clear water, pump means for supplying clear water to said blasting gun means to create a water jet stream which functions as the driving force for ejecting a slurry of water and abrasive particles from said gun means, and means for supplying the slurry containing said abrasive particles to said gun means, the improvement comprising: settling tank means for receiving therein water from the upper portion of said reclaiming tank, said settling tank means permitting further solid particles to be settled therein, and means for supplying water from the upper portion of said settling tank means to said clear water tank; said supplying means including reservoir means containing therein said slurry having a concentration of abrasive particles associated therewith, said reservoir means being disposed above said reclaiming tank and positioned at an elevation approximately equal to or above the elevation of said blasting gun means; said supplying means also including conduit means extending from the bottom portion of said reservoir means to said gun means for supplying abrasive particles thereto, and slurry pumping means for supplying the slurry as accumulated within said reclaiming tank to said reservoir means; said pump means comprising a reciprocating pumping device having at least two reciprocating pumping sections which are driven in an out-of-phase relationship to continuously supply an uninterrupted stream of pressurized water to said blasting gun means; each said reciprocating pumping section including a double-acting oil cylinder means having a reciprocal oil-actuated piston, and a water-pressurizing cylinder means having a reciprocal water-pressurizing piston, said water-pressurizing piston being connected to and driven by said oil-actuated piston; said water-pressurizing cylinder means including first conduit means associated therewith and communicating with said clear water tank for sucking water from said tank during the suction stroke of the water-pressurizing piston, and second conduit means connected to said blasting gun means for supplying pressurized water thereto during the exhaust stroke of said water-pressurizing piston; said reciprocating pumping device including first oil circuitry means connected to the oil cylinder means of both pumping sections, and having a first pressure pump associated therewith, for supplying pressurized oil to one side of the oil cylinder means to thereby move the oil-actuated pistons in one direction so as to cause the corresponding water-pressurizing piston to be driven through its exhaust stroke; said reciprocating pumping device including second oil circuitry means connected to the oil cylinder means of both pumping sections, and including second pressure pump associated therewith, for supplying pressurized oil to the other side of the oil cylinder means to individually move the oil-actuated pistons in the opposite direction so that they thereby drive the respective water-pressurizing piston through its suction stroke; said reciprocating pumping device having means associated thereafter for causing each oil-actuated piston and its respective water-pressurizing piston to be driven at a slow speed during the exhaust stroke, and at a faster speed during the suction stroke, so that the exhaust stroke requires a greater time than does the suction stroke; and control means associated with said reciprocating pumping device for controlling the reciprocating movement of said two reciprocating pumping sections so that the two reciprocating pumping sections are moved in an out-of-phase relationship such that at least one of the reciprocating pumping sections is supplying pressurized water to said gun means at all times, said control means causing the initial piston displacement of one reciprocating pumping section during its exhaust stroke to overlap with the terminal piston displacement of the other reciprocating pumping section when the latter is completing its exhaust stroke, whereby the suction stroke of the other reciprocating pumping section occurs wholly during a central portion of the exhaust stroke of said one reciprocating pumping section, and vice versa.