摘要:
The invention discloses a portable tool having a housing with a gearhead, having a motor shaft which can be rotationally driven by a motor and which can be coupled via an eccentric coupling drive to a tool spindle for the drive thereof, wherein the tool spindle can be driven in a rotational oscillatory manner about the longitudinal axis thereof and is configured for accommodating a tool, wherein a motion-reversal drive is provided which is configured for converting an oscillating drive movement produced by the eccentric coupling drive into an oscillating output movement which has a direction of oscillation opposed to said drive movement. The motion-reversal drive is configured as an epicyclic gearing.
摘要:
In a process for ultrasonic testing of elongated, prism-shaped sections (22) with at least one planar outer surface (54) extending along the longitudinal axis (26) of the section, with the objective of detecting material defects or verifying geometric data, the section (22) to be tested is exposed to ultrasonic beams from several ultrasonic probes (28 to 34) installed in a probe carrier (44). The section (22) is moved along its longitudinal axis (26) in relation to the probe carrier (44). The latter is installed in the rotor (20) of a rotary testing machine which rotates around the longitudinal axis (26) of the section (22). The probes (28 to 34) are installed in the probe carrier (44) so that each can be displaced individually, either transversely or, preferably, at right angles to the longitudinal axis (26) if the section (22) and the direction of the probes and/or so that their angular position can be adjusted individually by swivelling them around a swivel axis ( 58) running parallel to the longitudinal axis (26) of the section (22). The individual probes (28 to 34) are adjusted so that the central beams (46) emitted by each probe (28 to 34 ) impinge upon the planar outer surface (54) adjacent to one another, thus forming adjacent scanning zones in the volume of the section (22) to be tested. The probes (28 to 34) are triggered individually by an arrangement for determining the angle between the rotor (20) and the section (22); testing is only performed when the angle between the central beam (46 and the planar outer surface (54) lies within a predetermined range.
摘要:
A method for the gasification of coke is disclosed in which coke produced in a coking chamber and having a temperature of 900.degree. C. to 1100.degree. C. is forced into a coke bucket, after coking in the coking chamber, and fed by means of hot coke conveyors without substantial temperature changes to a gasifier. The coke is gasified in the gasifier while adding at least one of oxygen and air, and steam and carbon dioxide.
摘要:
A preheating moist fine material, such as pit coal and lignate, peat, wood, oil shale, or even ores or limestone for cement production, and an apparatus for carrying out the method are disclosed. Moist fine material is mixed above a heater with predried and preheated material until the mixture is made fluid. The fluid mixture slides down between and piles up to a level above the heater. A part of the predried and preheated fine material is removed from below the heater in an amount corresponding to another part thereof and is conveyed to above the heater with the moist fine material.
摘要:
The process for the production of molded metallurgical coke from dried coal or fine coal mixtures with a low swelling index particularly highly volatile fine coal comprises mixing normal washed fine coal or fine coal mixtures of a grain size of from 0 to 10 mm and a swelling index of not more than 5 with a binder, pressing the mixture into briquettes, oxidizing the briquettes in a continuous material flow stream, and coking the oxidized briquettes continuously in an oven chamber by supplying indirectly and exhausting the coke oven gases with a temperature of 300.degree. to 1200.degree. C. The device for carrying out the process includes a vertically extending reactor housing having an oxidation chamber adjacent the top thereof with an indirectly heated vertical coking chamber directly below the oxidation chamber and with a cooling chamber directly below the coking chamber and including means for circulating heating gases into the coking chamber and then upwardly through the coking chamber and out adjacent the top of the coking chamber and into the oxidation chamber.
摘要:
A process for releasing ammonia which is bound in coal water using a pre-desulfurization plant having ammonia and hydrogen sulfide scrubbers through which crude coking plant gas is passed comprises circulating the crude coke oven gases through the hydrogen sulfide scrubber and the ammonia scrubber in succession, directing the coal water first through the ammonia scrubber while the crude coking plant gases are being also circulated therethrough after passing it first through the hydrogen sulfide scrubber. An alkali solution is also circulated through the ammonia scrubber to enrich the solution with acid components and to liberate ammonia bound in the coal water directing the coal water which has been enriched from the ammonia scrubber into the hydrogen sulfide scrubber. The process is characterized by the fact that the alkali solution which has first served for the hydrogen sulfide scrubber is added to the ammonia hydrogen sulfide scrubber. 80 to 90% of the total alkali solution is charged to the hydrogen sulfide after-washery and then on the hydrogen sulfide pre-washery and the rest is charged to an ammonia expulsion apparatus.
摘要:
A method for producing hot briquettes, for example, for use in blast furnaces, and using a briquetting material of non-caking components, such as low temperature coke from bituminous coal and/or lignite, coke dust and/or oil coke and caking fat coal at temperatures between 430.degree. C. and 540.degree. C., comprising, delivering the briquetting material to a briquetting press to form briquette blanks, tempering and degassing the blanks by delivering the blanks into individual chambers in a closed system of several chambers having gas communication with each other so that there is partly changing amounts of gas generated in the individual chambers and the briquette blanks are formed into tempered briquettes, and applying an overpressure to the chambers to conduct the gases away from the chamber with one and the same overpressure. The equipment for the execution of the method comprises a hardening system in the form of a single cube-shaped tank having one corner which is inclined downwardly and which is divided into several substantially parallel narrow chambers by walls which are disposed parallel to the inclined outer surface and which has a channel above an upper lateral edge for charging hot briquettes into the individual chambers and also for conducting away gases formed during tempering in a path diagonally opposite to the charging channel. An emptying channel is located under the lower lateral edge of the tank.
摘要:
A method of producing reducing gases from oxide ores, particularly iron ores, which contain mainly carbon monoxide and hydrogen and which are employed in the reduction process with a two to three fold excess with regard to the stoichiometric requirement of the ore to be reduced, comprising, mixing a hot moist fresh reducing gas and a preheated recycled gas, both of which are used in reducing iron ores and mainly contain carbon monoxide and hydrogen, directing the mixed gases in counterflow heat exchange with iron sponge in a desulfurizer to treat the sponge, thereafter, directing the treated sponge into an oxidizer and circulating preheated air thereover to lightly oxidize the iron sponge, and subsequently, directing the lightly oxidized iron sponge into a reducing shaft along with the mixed gases which are taken out of the desulfurizer.
摘要:
A process for producing cement wherein preheated, partially calcined powder-form raw material is finally calcined in a fluidized bed and is discharged to a cooler through which a cooling stream of air passes. A part of the cooling air passes into the fluidized bed from below and another part of the cooling air, together with the partially calcined material, passes into the fluidized bed from the side. The rates of material flow to and from the fluidized bed is regulated to maintain a substantially uniform intersticial ratio between the upper and lower regions of the fluidized bed.
摘要:
A method of producing blast furnace coke from bituminous coals, particularly coals having poor coking capacities in which the coal to be carbonized is ground, predried or preheated, mixed with binders, compressed or formed into briquets having small mechanical resistances and charged into oven chambers, is characterized by fine coals or fine coal mixtures having a swelling index in mixture according to DIN 51741, smaller than 7, and preferably, below 6, and comprising more than 50% of poorly or non-baking coal having a content of volatile matter in excess of 30% or less than 20% which coals or coal mixtures are ground up to attain asurface per unit mass, according to DIN 66145, of from 400 cm.sup.2 to 1200 cm.sup.2 per gram, and with from 3% to 8% by weight of organic binders, compressing the mixture to form it into a briquet at a temperature range of from 70.degree. C. to 300.degree. C. and charging the compressed briquet into the oven chambers without substantial intermediate cooling in order to carbonize it.