An actuator is configured to couple with a controlled member and includes first and second pistons disposed in respective internal chambers. The first piston may be moveable between first and second positions. The second piston may be moveable between third and fourth positions. The second piston may be configured not to engage the first piston when the second piston is disposed at the third position. The second piston may be configured to move the first piston to the second position as the second piston moves from the third position to the fourth position. A resilient member may be disposed to resiliently urge the second piston toward the fourth position.

A processor (213) carries out, after a device is activated and before a blasting medium projected to a projection target object (500), a first inspection process (T1) for determining, in a state in which no blasting medium (400) is supplied to an impeller (110) while each motor of the impeller is rotating, whether a current value supplied to the each motor of the impeller is not more than a first threshold (θ1), and a second inspection process (T′1) for determining, in a state in which the impeller is projecting the blasting medium, whether the current value supplied to the each motor of the impeller is not less than a second threshold (θ2), and displays, on a display (300), at least one of (1) respective determination results of the first inspection process and the second inspection process and (2) a determination result obtained by generalizing the determination results (1).

Systems and methods for cleaning and preparing a surface are described. The system includes a housing with a first hopper configured to receive a first material and a second hopper configured to receive a second material. A tube housing an auger may be located where the two hoppers meet. In this way, the materials are mixed in the tube before being pushed through a hose to a nozzle. The mixture can be sprayed out of the nozzle. The mixture only requires a single air source, and the system operates using a combination of gravity, venturi suction, vibration, an auger and the like.

The portable apparatus for cleaning surfaces comprises a base (3); a tank (2) associated with said base (3) at the top thereof, said tank (2) being predisposed to contain at least one abrasive material. At least one mixing valve (9) is associated with the base (3) and connected with said tank (2) so as to receive said abrasive material contained in said tank (2) and mix said abrasive material with a predetermined amount of compressed air. An adjusting member (11) is associated with the tank (2), said adjusting member (11) being predisposed to enable the selection of a predetermined value indicating the amount of said abrasive material to be mixed with said compressed air in said at least one mixing valve (9).

A method for calibrating an electronic sensor for peening intensity. A range of desired intensity levels is chosen and that range may contain a single value or multiple values. The parameters for a blast stream are set that correspond to a particular intensity level. Test strips are peened in the blast stream and then the arcs of the peened strips are measured to determine the intensity level of the blast stream. Subsequently, a sensor is placed in the blast stream set at particular intensity levels and the signal generated at each intensity level is recorded. A roto-flap peening device can also be set at particular intensity levels and then a sensor is subjected to the roto-flap peening device set at those levels. A chart may be developed that correlates peening intensity to the signal of the sensor so the sensor may be used in place of Almen strips.

A method for calibrating an electronic sensor for peening intensity. A range of desired intensity levels is chosen and that range may contain a single value or multiple values. The parameters for a blast stream are set that correspond to a particular intensity level. Test strips are peened in the blast stream and then the arcs of the peened strips are measured to determine the intensity level of the blast stream. Subsequently, a sensor is placed in the blast stream set at particular intensity levels and the signal generated at each intensity level is recorded. A roto-flap peening device can also be set at particular intensity levels and then a sensor is subjected to the roto-flap peening device set at those levels. A chart may be developed that correlates peening intensity to the signal of the sensor so the sensor may be used in place of Almen strips.

A comminutor reduces the size of particles of frangible blast media from each particle's respective initial size to a size smaller than a desired maximum size. The frangible blast media may be entrained in a flow of transport gas. The comminutor includes an inlet and an outlet, both in fluid communication with an internal flow passageway. The internal flow passageway includes a first intermediate passageway which comprise the gap defined by two rotating rollers and a second intermediate passageway which includes an inlet disposed proximal the gap, extending in an upstream direction therefrom.

An abrasive blasting system that includes a blast hose, and a deadman assembly coupled with the blast hose. The deadman assembly further includes a primary deadman switch and a secondary deadman switch. The deadman also has a base frame, with each of the primary deadman switch and the secondary deadman switch coupled with the base frame. There is a trigger member pivotably coupled with the base frame, the trigger member configured to contact and move the primary deadman switch to a signal-flow position, and also to contact and move the secondary deadman switch to a secondary signal-flow position.

A hydrodynamically optimized mixer module, to be coupled to a deterministic hydrodynamic tool that allows pulsed polishing of optical surfaces is described. This module allows the supply of abrasive foam or fluid that enters the tool to be interrupted without impairing the operational stability of the polishing process and of said hydrodynamic tool. The mixer module includes at least one interrupter element for switching high-velocity fluids; a first inlet through which air is injected under pressure and in a controlled manner; a second inlet through which a polishing fluid is injected in a controlled manner, said polishing fluid filling a predetermined volume with a hydrodynamically optimized shape and being transferred to a mixing zone where, together with the pressure-injected air, an abrasive foam is produced that is injected into at least one rotational acceleration chamber of the hydrodynamic tool to which the mixer module is coupled.

A hydrodynamically optimized mixer module, to be coupled to a deterministic hydrodynamic tool that allows pulsed polishing of optical surfaces is described. This module allows the supply of abrasive foam or fluid that enters the tool to be interrupted without impairing the operational stability of the polishing process and of said hydrodynamic tool. The mixer module includes at least one interrupter element for switching high-velocity fluids; a first inlet through which air is injected under pressure and in a controlled manner; a second inlet through which a polishing fluid is injected in a controlled manner, said polishing fluid filling a predetermined volume with a hydrodynamically optimized shape and being transferred to a mixing zone where, together with the pressure-injected air, an abrasive foam is produced that is injected into at least one rotational acceleration chamber of the hydrodynamic tool to which the mixer module is coupled.