摘要:
The present invention provides a spring integrally formed in a face plate of a housing for use with printed circuit board mounted operators having a central portion and J-shaped extensions. Stresses incurred when the central portion of the spring is pressed are distributed along the length of the extensions thus reducing maximum stress concentration in the spring. Additionally, material surrounding the spring is only minimally deflected when a spring is deflected, adjacent operators are not inadvertently actuated.
摘要:
A reflex I/O card for an industrial controller receives enabling inputs from the executed control program and triggering inputs from an industrial process to provide outputs at a fixed delay in time or portion of a machine cycle after the inputs through dedicated hardware thus avoiding transmission delays and processing delays associated with the communication of information to a central processor and the execution of the control program.
摘要:
A system is disclosed for drying a material to liberate a substance such as a liquid having a vapor pressure from solids and/or dissolved substances in the material. The system includes a plenum chamber and a blower providing a stream of air to the plenum chamber. An outlet communicates with the plenum chamber and a velocity accelerator is disposed downstream of the outlet. The velocity accelerator is arranged to receive air from the outlet of the plenum chamber into a progressively narrowing interior passageway terminating at a downstream choke point orifice. The choke point orifice discharges into a larger diameter discharge region. A throttle body is disposed in the discharge region and is selectively movable toward and away from the choke point orifice to decrease or increase the volume of the discharge region. A passageway is formed through the throttle body for receiving flashed material from the discharge region and conveying the material in a downstream direction. Also disclosed is a system for drying materials contained within a processing vessel wherein flash generators with vacuum throttles are used to maintain drying conditions within the vessel and to remove liberated substance from the processing vessel.
摘要:
Methods and systems are disclosed for drying a material or, more generally, flash evaporating a target substance having a vapor pressure threshold. The methods and systems include a conveyor conduit that receives material. The material moves through the conveyor and is expelled into a pressure drop zone created by one or more venturi nozzles. As the material encounters the pressure drop zone, the targeted substance in the material experiences a rapid and extreme pressure drop and simultaneously a rapid temperature increase. This causes the target substance in the material to flash evaporate virtually immediately. The resulting vapor is separated from the remaining material and the now dry material is collected for further processing or use. The vapor can be collected, condensed, exhausted, or otherwise treated depending upon the goals of a particular installation or process.
摘要:
A programming language for programming industrial controllers in relay ladder logic language, the programming language including both extensions to standard RLL rung form itself and extensions wholly independent of the standard form. The language uses a plurality of templates, each template including truly reusable relay ladder language sections. Most templates also include specifications identifying other templates which provide additional language logic required to define job-specific aspects of the referencing template. Using the templates a machine tree can be provided which mirrors an industrial process. By compiling all of the templates, a relay ladder language program can be provided.
摘要:
Low voltage logic circuitry is used to permit an entire subsystem of an industrial controller to be placed within a hazardous environment to receive a high speed serial link and undertake the control of multiple control points without expensive and awkward long cable runs and electrically isolating circuits for each cable run. Energy and bandwidth limiting on the high speed link allows power levels commensurate with high data rates yet intrinsic safety of the media allowing it to freely pass in and out of the hazardous area. A mixture of intrinsically safe and non-intrinsically safe equipment on the same logical rack is allowed through a bus isolator providing isolated data communication in backplane fashion between modules while wholly isolating power transmission along the backplane.
摘要:
Methods and systems are disclosed for drying a material or, more generally, flash evaporating a target substance having a vapor pressure threshold. The methods and systems include a conveyor conduit that receives material and within which a pressure is established that is greater than the vapor pressure threshold of the target substance. The material moves through the conveyor and is expelled into a pressure drop zone created by one or more venturi nozzles. The pressure in the pressure drop zone is far less than the vapor pressure threshold of the target substance. As the material encounters the pressure drop zone, the targeted substance in the material experiences a rapid and extreme pressure drop and simultaneously a rapid temperature increase. This causes the target substance in the material to flash evaporate virtually immediately. The resulting vapor is separated from the remaining material and the now dry material is collected for further processing or use. The vapor can be collected, condensed, exhausted, or otherwise treated depending upon the goals of a particular installation or process. The methods and systems are particularly useful for drying water from moisture laden material such as coal wash fines.
摘要:
A shutter switch is disclosed and placed in the path of a millimeter beam and is either opaque or transparent to the beam. The shutter switch comprises a number of waveguides placed adjacent to one another to intercept the beam, a portion of the beam passing through each waveguide. The dimensions of each waveguide are such that transmission of the respective portion of the beam would be cut-off if all of the waveguide walls were conductive. However, the waveguides have high impedance structures on at least two of their opposing interior walls that allow the beam at the design frequency to be transmitted through the waveguide with uniform density and minimal attenuation. At this design frequency the shutter switch is essentially transparent to the beam. Each of the high impedance structures can also be changed to a conductive surfaces such that all of the waveguide walls appear conductive and the waveguide takes on the characteristics of a metal rectangular waveguide. In this state transmission through each waveguide is cut-off and the shutter switch blocks transmission of the beam. The shutter switch can change states from blocking to transparent in microseconds or less while consuming very little power.
摘要:
A switch comprises a first and second contacts, a plunger, a toggle bar, and a spanner. A preferred trip lever arrangement is used in which a trip lever transfers an actuating force from the plunger to the toggle bar, and the toggle bar is caused to move farther than the plunger to provide a short trip point. Swing arms that are acted upon through a series of rigid body force transfers allow an operator to manually force welded contacts to be broken in the event that the contacts become welded to a spanner or other components of the switch assembly.
摘要:
A system software solution for controlling an enterprise which defines and illustrates the electrical, pneumatic, hydraulic, logic, diagnostics, external behavior, controlled resources and safety elements of an enterprise control system. The elements of the control system are encapsulated in objects of an object-oriented framework within a control assembly. The control assembly is the fundamental building block for providing object-oriented control of the enterprise. A control assembly component is a deployable control subsystem that provides an interface using a common object model that is configurable. The enterprise control system includes facilities for retrieving external models utilizing a predefined interface. The retrieved model includes support for external resources such as an external resource tree in which the leaf nodes correspond to resources to be controlled, resource and process information and a computer aided design model. The retrieved model is transformed from a flowchart representation into a timing diagram.