The present disclosure relates to a nozzle block applied to an electrospinning device, which includes a radiation nozzle having a hollow radiation needle for discharging a spinning solution to the outside; a means of piercing having a diameter smaller than that of the radiation needle, at least one of which is coaxially disposed inside the radiation needle; and a reciprocating mechanism for reciprocating the means of piercing and the radiation needle relative to each other, thereby preventing the solution from being solidified at the tip of the radiation nozzle or the radiation nozzle from being blocked by external contaminants even if the electrospinning process is temporarily interrupted in the middle.

A delivery head for a dispensing machine for delivering fluid products, including: a tubular casing having a vertical longitudinal axis, a plurality of nozzles carried by the tubular casing and having respective outlet openings with axes parallel to the vertical longitudinal axis, and a cleaning device for automatically cleaning the nozzles, having a plurality of scraper tubes associated with respective nozzles, movable in a direction of the vertical longitudinal axis between a raised position and a lowered position, and vice versa, and having respective lower ends that clean the nozzles during a stroke from the raised position to the lowered position.

The showerhead has a hollow body (10) provided with an inlet nozzle (11) and with a sieve (C) perforated by holes (13) and a cleaning device (40) carrying a plurality of lower pins (41) and displaceable, in the interior of the hollow body (10), between an inoperative position, with the pins (41) spaced from the sieve (C), and an operative position, with each pin (41) introduced into one hole (13) of the sieve (C) and defining at least one water outlet with the hole (13). A driving element (50) is associated with the inlet nozzle (11) and is affixed to the cleaning device (40), in order to maintain it in the inoperative position, while the hydraulic pressure in the inlet nozzle (11) is less than a reference value and displacing the cleaning device (40) to the operative position, when the hydraulic pressure reaches the reference value. A biasing element (60) displaces the driving element (50) and the cleaning means (40) to the inoperative position, when the hydraulic pressure is lower than the reference value.

In one embodiment, a self-cleaning nozzle comprises a nozzle body, a sleeve surrounding a proximal end of the nozzle body, a pillar disposed within the nozzle body and a spring. The nozzle body may have a hollow cylindrical interior. The nozzle body may include an orifice formed in a distal end of the nozzle body, a shoulder formed on a proximal end of the nozzle body, and a first bearing surface on an outer lateral face of the shoulder. The sleeve may include a second bearing surface on an inner face of the sleeve and a retaining lip formed at a distal end of the sleeve. The retaining lip may define a distal end of an annular space between the sleeve and the nozzle body. The shoulder may define a proximal end of the annular space. The pillar may have a distal tip configured to interface with the orifice, thereby forming a liquid seal. The spring may be captured within the annular space, thereby biasing the distal tip of the pillar into contact with the orifice.

An emission part of a cooling device has a plurality of emission holes. In the emission part, a separator urged by coil springs is disposed, and needles respectively corresponding to the emission holes are provided on the separator. As the separator is moved to a closing position, leading end portions of the needles are inserted into the emission holes to close the emission holes. Thus, when emission of water through the emission holes is stopped in the emission part, water inside the emission holes is pushed out and removed by the leading end portions of the needles inserted into the emission holes. This can reduce the likelihood of clogging of the emission holes due to water that cools a radiator by its latent heat of evaporation.

A nozzle through which a liquid coolant is discharged is provided with an outer tube, a projecting member and an inner tube disposed inside the outer tube, and an elastic body disposed between the inner tube and a discharge port of the outer tube. If foreign matter accumulates on a nozzle opening of the inner tube, the elastic body is compressed by the inner tube under the pressure of the coolant, so that the inner tube moves toward the discharge port. Consequently, the projecting member penetrates the nozzle opening, thereby automatically removing the foreign matter accumulated on the nozzle opening.

The invention relates to a method for producing foamed molded bodies comprising the steps of A) providing a mold, and B) introducing a foam-forming reaction mixture into the mold under variable pressure of injection,
wherein the method is characterized in that
the foam-forming reaction mixture has a fiber time of ≧20 s to ≦60 s.

The invention relates to a cleaning device for a yarn forming element of an air-spinning nozzle, to a spinning position of an air-spinning machine and to a method for cleaning a yarn forming element of this type. In order to provide a spinning position of an air-spinning machine and a method for cleaning a yarn forming element of an air-spinning machine which allow long and trouble-free operation with constant quality and strength of the yarn produced, it is provided that the cleaning device has a cleaning strip and a storage unit for providing and retracting the cleaning strip, a fixed end of the cleaning strip being fastened to the storage unit, and a free end of the cleaning strip being able to be provided for cleaning and retracted again after the cleaning. Furthermore, the cleaning device has a cleaning strip guide for feeding the free end of the cleaning strip to the yarn forming element of the air-spinning nozzle for mechanical cleaning.

A nozzle, including a support member and a nozzle boot surrounding at least a portion of the support member, the nozzle boot having a nozzle boot inlet and a nozzle boot outlet spaced from the nozzle boot inlet and a volume between the nozzle boot inlet and the nozzle boot outlet, the nozzle boot being expandable upon the introduction of fluid into the volume, and collapsible upon withdrawal of fluid from the volume. Also disclosed is a method of removing unwanted concrete from a surface by creating tensile stress to concrete adhered to that surface by causing the surface to expand, and a system for injecting fluid (s) into a rotating drum.

This disclosure relates to a showerhead including a body, a stationary plate, a spring, and an insert fitting member. The body has an upper body and a lower body. The upper body and the lower body form an accommodation space. A water inlet for supplying water into the accommodation space is provided at the upper body, and a plurality of water outlets for spraying water from the showerhead are provided on the lower body. The stationary plate is located in the accommodation space and movable up and down in the accommodation space along a direction of the water flow. The spring is disposed between the stationary plate and the lower body, for applying a force to the stationary plate away from the lower body. The insert fitting member is fitted to the stationary plate. The position of the insert fitting member corresponds to the plurality of water outlets on the lower body. When the water is supplied, the stationary plate moves to a lower position under the action of water pressure, and the insert fitting member partially closes the water outlet to form a drizzle-type spray; and when the water is turned off, the spring pushes the stationary plate back to the upper position, and the water outlet plug leaves the water outlet.