A sand source selecting structure for a sandblasting gun has a main body; a channel provided in the main body, for passing a high pressure gas; at least two sub-channels provided in the main body respectively connected to the channel; a sandbox mounted on the main body connected to the channel through each of the sub-channels; at least one supply tube; a first control valve installed in the main body, for connecting the sandbox and at least one of the sub-channels of the channel; and a second control valve installed in the main body, for connecting the channel and another sub-channel of the supply tube. Therefore, the combination of the first control valve and the second valve provides a selecting structure, which can offer different sand supply sources.

A method of removing surface carbon contamination from polycrystalline silicon comprises providing a polycrystalline silicon feed stream having surface carbon contamination, subjecting the polycrystalline silicon to a high velocity fluid selected from gas, gas/liquid mixtures, gas/solid mixtures and gas/solid/liquid mixtures to form a product stream comprising polycrystalline silicon having surface carbon in an amount of less than 200 parts per billion by weight based on weight of the polycrystalline silicon product and/or a reduction in surface carbon contamination of at least 20%. A system for conducting the method comprises an enclosure, a conveyer for moving a polycrystalline silicon feed stream through the enclosure, at least one stream of a high velocity fluid passing through outlets in the enclosure and directed at the feed stream, an ionizing source in the enclosure or integrated with the at least one stream of high velocity fluid, and an exhaust system for the enclosure.

A dry to wet abrasive blast machine conversion kit and method usable to convert an existing blast pot configured for sand blasting for use in wet abrasive air blasting includes a multi-function fluid manifold, and a control panel attachable to the blast pot to effectuate a first hydraulic circuit, a second hydraulic circuit, and a pneumatic circuit. The dry to wet abrasive blast machine conversion kit installs to the existing blast pot as is, and therefore enables conversion for wet abrasive blasting without additional penetrations through the blast pot envelope which might otherwise compromise manufacturer warranty and use ratings.

A method and apparatus entrain particles in a flow of blast fluid from a flow of transport fluid with particles entrained therein, in which an effectual amount of the transport fluid is vented or extracted prior to the entrainment of the particles in the flow of blast fluid.

An abrasive jet cutting system may include a differential pressure measurement apparatus configured to measure a differential pressure between points in an abrasive supply system. The differential pressure may be used to determine one or more conditions of the jet and the abrasive delivery. The measured differential pressure may be used in a feedback control system, feed forward control system, and/or an alarm or safety system.

The present disclosure presents a method and a system for modifying a surface of a substrate. The method includes an act of abrasive blasting of a part of the surface of the substrate. In the abrasive blasting, an abrasive media is provided to the part of the surface. The abrasive media is carried to the part by a first carrier. The abrasive media collides with the part of the surface and causes abrasion to the part of the surface. In the method, the first carrier includes steam. The steam of the first carrier heats the part of the surface.

The present disclosure relates to the technical field of automobile part processing, and specifically provides a spray head device and a sandblasting device for automobile part processing. The spray head device comprises a spray head body and a connecting pipe. A conical through hole is penetratingly arranged in the spray head body, one end of the conical through hole forms a discharge port, the other end of the conical through hole forms a feed port, the caliber of the feed port is greater than that of the discharge port, the connecting pipe is fixedly connected to one end of the feed port of the spray head body, and the connecting pipe is coaxially arranged with the conical through hole; the conical through hole is penetratingly provided in the spray head body.

An abrasive jet cutting system may include a differential pressure measurement apparatus configured to measure a differential pressure between points in an abrasive supply system. The differential pressure may be used to determine one or more conditions of the jet and the abrasive delivery. The measured differential pressure may be used in a feedback control system, feed forward control system, and/or an alarm or safety system.

A method for machining at least one portion of a surface of a component for a vehicle, which is painted with a layer of clear coat of a given first layer thickness. The component is situated in an inner space of a blasting chamber. An opening of at least one conveying device for a blasting material emerges into the inner space. The inner space of the blasting chamber and the component are placed entirely under a partial vacuum. Blasting material in a carrier air flow generated by the partial vacuum is supplied through the opening of the conveying device to the inner space. The portion of the surface being machined and the opening of the conveying device are moved relative to each other. The blasting material is shot from the opening of the conveying device onto the portion of the surface being machined.

An apparatus and method for generating ice pellets, in particular for controlling the properties of the generated ice pellets. The apparatus comprises a pellet generation region; at least one nozzle configured to supply a plurality of water droplets to the pellet generation region; a liquefied gas supply configured to deliver a liquefied gas to the pellet generation region to thereby freeze the water droplets to generate a plurality of ice pellets; at least one temperature measuring device configured to obtain data indicative of the temperature of the ice pellets at generation; and a control system configured to adjust the flow rate of water and/or liquefied gas to thereby control the temperature of the ice pellets at generation.