A control apparatus, which controls a drive motor that drives a rotor installed in an electrical aircraft, instructs the drive motor to selectively operate in at least two motor-control modes. The at least two motor-control modes include a flying motor-control mode for causing the electrical aircraft to fly, and a cleaning motor-control mode for cleaning the rotor. The control apparatus controls, in the cleaning motor-control mode, the drive motor such that a rotational frequency of the drive motor is lower than a predetermined human-audible frequency range.

A rinse device has a housing part and a rinse head. The rinse head has a plurality of openings through which the pressurised fluid is ejected. The housing part includes an outer housing tube and an inner piston movable axially relative to the outer housing tube, and a sealed air-filled cavity defined therebetween, and a spring attached at a first end to the outer housing tube and at a second end to the piston, and wherein the rinse head is attached to the piston at the second end of the housing part, such that the spring is biased to hold the piston at a first axial position relative to the outer housing tube until a force exerted by the pressure of the fluid inside the housing part exceeds the sum of an axial force of the spring and the force from the pressure of the air in the air cavity.

A flowback tank cleaning system and method is described. A flowback tank includes a self-cleaning system. A flowback tank cleaning method may include moving solid debris collected at a bottom of a collection section of a flowback tank towards a lift auger using a cleaning auger or a conveyer belt extending along a length of the collection section, the bottom of the collection section including an angled trough, funneling solid debris towards the cleaning auger or conveyor belt by placing the cleaning auger or conveyor belt at a base of the angled trough, spraying fluid downward through a series of fluid outlets, removing the sand so moved by the cleaning auger or conveyer belt from the flowback tank using the lift auger, and removing the fluid from the flowback tank using a drain manifold below the cleaning auger or conveyer belt.

A robotic device for working on a surface includes a body including: a tool for working on the surface; a controller moving the body along the surface; a first set of at least two rotors mounted to the body and generating thrust in a first direction towards the surface; and a second set of at least two rotors mounted to the body and generating thrust in a second direction away from the surface. A sensor measures a distance between the body and the surface, and a computer adjusts the first set of rotors and the second set of rotors in response to the sensor to place the body in position to work on the surface. In particular, the first set of rotors and the second set of rotors generate a net force on the body to it in non-contact position to work on the surface.

A nozzle for hydrodynamic cleaning has a form form of a flow passage with a profile formed by an inlet confuser, a resonance chamber and a diffuser arranged in axial alignment and interconnected in series. The confuser and the diffuser are connected via the resonance chamber, which has a form of a flow-over lip. The ratio of the cross-sectional area at the confuser outlet and the cross-sectional area at the opening of the resonance chamber forming the flow-over lip is 1.5 to 10.0. The preferred ratio of the resonance chamber surface area and the cross-sectional area at the opening of the resonance chamber is 0.05 to 40.0. The diffuser can comprise means for additional supply of fluid, gas or particulates. Impact is performed through a fluid jet flowing from a nozzle of the working member in a fluid or a gaseous medium.

A flowback tank cleaning system and method is described. A flowback tank includes a self-cleaning system. A flowback tank cleaning method may include moving solid debris collected at a bottom of a collection section of a flowback tank towards a lift auger using a cleaning auger or a conveyer belt extending along a length of the collection section, the bottom of the collection section including an angled trough, funneling solid debris towards the cleaning auger or conveyor belt by placing the cleaning auger or conveyor belt at a base of the angled trough, spraying fluid downward through a series of fluid outlets, removing the sand so moved by the cleaning auger or conveyer belt from the flowback tank using the lift auger, and removing the fluid from the flowback tank using a drain manifold below the cleaning auger or conveyer belt.

Disclosed is a wheel cleaning device, comprising a frame, a waste water recovery tank, lifting guide posts, a feeding support plate, a lifting cylinder, a lifting platform, a support plate, an adjusting cylinder, a left slide plate, bolt hole cleaning spray pipes, clamping cylinders, a left clamping slide plate, a central cleaning spray pipe, clamping wheels, left spray pipes, left upper spray pipes, right upper spray pipes, right spray pipes, shafts, a right clamping slide plate, servo motors, clamping guide rails, clamping system support plates, a support, a right slide plate, a gear rack structure and a guide rail. The device can clean aluminum scraps remaining in bolt holes, flange drainage channels and weight reduction pits, meets the requirements of automatic production lines, and has the characteristics of compact structure, flexibility, practicability, stability, high efficiency and the like.

Embodiments of the present invention are related to a fluid control device for cleaning elevated channels including a top, a bottom, a first side, a second side, and a pair of angled exterior upper surfaces. The top includes a top aperture structured to receive tubing therein and the first side and second side include a spout respectively. The fluid control device is structured to receive fluid into the device top and direct that fluid out the first side and second side at downward side angles.

A substrate processing apparatus includes a substrate holding unit, a rotation driving unit, a first rotational ring, a second rotational ring, and a first nozzle. The substrate holding unit includes a base plate and a plurality of gripping units that grips a peripheral edge of a substrate, and horizontally holds the substrate spaced apart from the base plate by the gripping units. The rotation driving unit rotates the substrate holding unit. The first rotational ring surrounds a peripheral edge of a lower surface of the substrate and rotates together with the substrate holding unit. The second rotational ring is provided outside the first rotational ring, surrounds a peripheral edge of an upper surface of the substrate, and rotates together with the substrate holding unit. The first nozzle ejects a cleaning liquid from above an entrance of a rotational flow path toward the entrance of the rotational flow path.

An aircraft oven includes a first portion having an inner cavity surrounded by an inner housing. The first portion includes a ventilation area. The aircraft oven also includes a second portion including a water line that extends through the second portion, and wherein the water line extends along the inner housing, a first plurality of nozzles configured to extend from the water line into the inner cavity, and a second plurality of nozzles configured to extend from the water line, through the inner housing and into the ventilation area.