摘要:
A pneumatic ground piercing tool according to the invention has a reversing mechanism provided as part of the air distributing mechanism. Such a tool includes an elongated tubular housing having a rear opening, a head assembly including an anvil, a striker disposed for reciprocation within an internal chamber of the housing to impart impacts to a rear impact surface of the anvil for driving the body through the ground, an air distributing mechanism for effecting reciprocation of the striker, and a tail assembly mounted in a rear end opening of the housing that secures the striker and air distributing mechanism in the housing. In one embodiment, the outer bushing of the valve sleeve can slide a short distance relative to the air supply tube and has an intermediate radial port which selectively communicates with the air supply conduit. The valve sleeve also includes a detent mechanism for securing the air supply tube in its forward or reverse position. A biasing device such as an resilient tube biases the detent mechanism to an unlocked position when the compressed air is off, and is overcome by air pressure so that the detent assumes a locked position when the compressed air is on.
摘要:
The invention provides an apparatus and a method for installing a pipe in a pre-bored hole. According to one aspect of the invention, the apparatus comprises a plug having a rear cylindrical portion with external threads engaged with internal threads of a front portion of a plastic pipe section. A front portion of the plug includes a pulling attachment, and a rear portion of the pipe section extends beyond the rear portion of the plug for attachment to a pipe to be towed through the hole. According to another aspect of the invention, the apparatus comprises a plug having a pulling attachment at a front end, a rear portion with external threads, a lengthwise external cutaway portion on the rear portion, and a slot extending radially through the rear portion. The lengthwise external cutaway portion forms an edge for cutting into an interior surface of a plastic pipe and the slot forms a suitable collection space for collecting pieces of plastic cut from the interior of the pipe by engagement of the threads. The invention also provides an apparatus and method for simultaneously installing several underground pipes in a pre-bored hole. This apparatus comprises a mounting plate having a generally flat plate including a plurality of spaced, crucifix-shaped openings extending through the plate. Several pulling devices can be secured to the mounting plate by sliding a plurality of chains, each chain attached to one pulling device, into one of the openings.
摘要:
The invention provides a method for reversing an impact boring tool of the type having a reversing mechanism actuated by rotation of the compressed air supply hose that enters the tool through a rear end opening. This method includes the initial step of connecting the air supply hose to the tool using a quick-release coupling device including tubular male and female members which are coupled together, one of the members being mounted on the end of the air supply hose and the other mounted on an air inlet conduit of the tool, the coupling device further having a locking sleeve and a ball seated in a first pit in one of the members and configured for insertion into a second pit in the other of the members as the locking sleeve moves over the ball, the locking sleeve being biased to a locked position wherein the ball is seated in both pits thereby preventing rotation of one member relative to the other as well as disengagement of one member from the other. The tool is then operated for earth boring, the direction of travel of the tool is then reversed by rotating the air hose, which rotation is transmitted to the air inlet conduit of the tool by the ball of the coupling device.
摘要:
In a process for converting C9+ aromatic hydrocarbons to lighter aromatic products a feed comprising C9+ aromatic hydrocarbons is contacted under transalkylation reaction conditions with a catalyst composition comprising (i) a first molecular sieve selected from the group consisting of ZSM-12, mordenite and a porous crystalline inorganic oxide material having an X-ray diffraction pattern including d-spacing maxima at 12.4±0.25, 6.9±0.15, 3.57±0.07 and 3.42±0.07; and (ii) a second molecular sieve having a constraint index ranging from 3 to 12. At least the first molecular sieve has a hydrogenation component associated therewith and the first and second molecular sieves are contained in the same catalyst bed. The C9+ aromatic hydrocarbons are converted under the transalkylation reaction conditions to a reaction product containing xylene.
摘要:
A gasoline engine having an exhaust system comprises means for trapping particulate matter (PM) from the exhaust gas and a catalyst for catalysing the oxidation of the PM by carbon dioxide and/or water in the exhaust gas, which catalyst comprising a supported alkali metal. The invention further includes a method of combusting PM from a gasoline engine in CO2 and/or H2O from the exhaust gas at temperatures in excess of 500 ° C., which method comprising trapping the PM and contacting it with a catalyst comprising a supported alkali metal.
摘要:
An oligomerization process in which hydrocarbon feedstocks are contacted with a hydrotreating catalyst in the absence of hydrogen and in the liquid phase. The catalyst is a heterogeneous catalyst selected from supported reduced metals, metals oxides, metal sulfides and combinations thereof. Preferred catalysts include mixed nickel and molybdenum oxides or mixed cobalt and molybdenum oxides. The process also oligomerizes sulfur compounds so that sulfur containing feedstocks can be treated without deactivating the catalysts.
摘要:
A process is provided for the production of xylenes from reformate. The process is carried out by methylating under conditions effective for the methylation, the benzene/toluene present in the reformate outside the reforming loop, to produce a resulting product having a higher xylenes content than the reformate. Greater than equilibrium amounts of para-xylene can be produced by the process.
摘要:
A cyclic cable pulling machine includes a reaction plate having a flat front face, a frame secured to the reaction plate and a cable pulling mechanism including a hydraulic cylinder and a cable gripping mechanism, the cable gripping mechanism having jaws positioned to engage the cable during a pulling stroke, the hydraulic cylinder having an end abutting the reaction plate and an opposite end secured to the cable gripping mechanism for movement of the cable gripping mechanism away from the reaction plate during a pulling stroke and a powered clamping device attached to the frame which holds the cable during return movement of the cable pulling mechanism.
摘要:
In a process for preparing a selectivated catalyst composition useful in the disproportionation of toluene, a catalyst comprising an acidic molecular sieve is contacted with a boron compound at a temperature in excess of 500° C.; and the resultant catalyst is then contacted with a medium containing hydrogen ions to at least partially restore the acid activity of the molecular sieve.