37results about How to "Maintenance-free operation" patented technology

A manipulator apparatus carries tools for connecting drillpipes to the drillstring in a wellbore on a drilling platform. A telescopically extendable horizontal work arm is carried on a telescopically extendable vertical column, and the tools are to be mounted on a free end of the work arm. The column is manually rotatable about a vertical axis. The column and the work arm are each respectively formed of a fixed element and a telescopically extendable element. The fixed element is preferably formed of two U-profile members arranged back-to-back, and the extendable element includes an H-profile member with its web received between the webs of the two U-profile members. This forms a telescopic slide bearing of the H-profile member sliding along the two U-profile members. The hydraulic cylinders are received in the recessed spaces of the profile members.

A linear motion guide unit is provided which is downsized in size, maintenance-free for lubrication, and makes it possible to assemble easily and quickly the slider with accuracy. The end cap has outward end surfaces each of which is concaved to provide a first recess to fit over a lubricant applicator of porous compact to apply the rollers while running through the turnaround passages, and a second recess to fit over a retainer plate. The retainer plate is surrounded with a peripheral edge of the end cap and held in place with a snap-fit engagement with the end cap to squeeze the lubricant applicator inside the first recess in the end cap.

The invention discloses a device for preventing vehicles from converse running on public roads and an application of the device to municipal roads, and is used for providing a municipal facility witha new structure. The device comprises a cover plate, linear guideways, a large gear and a barbed roller, wherein two parallelly-arranged bases are fixed in ground grooves, and the bases are the linearguideways; the linear guideways are connected with the barbed roller by a rack and pinion structure; resilient elements for resetting are arranged between the linear guideways and the bases or between the linear guideways and the ground grooves; when the resilient element are in a relaxed state, arc tops protrude out of first windows, and stabs are hidden in the ground grooves; after a pressing block is pressed down, the large gear and the barbed roller are driven to rotate, so that the stabs protrude out to be above the cover plate. According to the device, by setting the elastic coefficients of compression springs and leaf springs, the stabs protrude out only when a vehicle exceeding the designed weight passes the device, to force the vehicle to stop, the stabs do not protrude out whena non-motor vehicle passes, and thus the security is high.

The invention belongs to the technical field of boiler smoke exhaust purification equipment, and particularly discloses a boiler smoke exhaust purification system. The boiler smoke exhaust purification equipment comprises a dust removal chamber and a desulfurization and denitrification chamber, wherein the upper part of the dust removal chamber and the upper part of the desulfurization and denitrification chamber communicate with each other through a smoke exhaust passage, the middle part of the dust removal chamber and the middle part of the desulfurization and denitrification chamber communicate with each other through an overflowing passage, a water supplementing pipe is arranged at the upper part of the dust removal chamber so as to keep the liquid level in the dust removal chamber atthe position of an overflowing passage opening, moreover, the liquid level in the desulfurization and denitrification chamber is kept not higher than the position of the overflowing passage opening, and an alkali supplementing liquid pipe is arranged at the upper part of the desulfurization and denitrification chamber. According to the boiler smoke exhaust purification system, dust removal and desulfurization and denitrification are carried out in a separated mode, therefore, the situations that an alkali liquor is wasted due to dust pollution to the alkali liquor and the precipitation is difficult to treat are avoided; dust deposits are independently removed through the dust removal chamber, a reaction precipitate is independently discharged through the desulfurization and denitrificationchamber, and different discharged products are separately treated, so that the effects of high-efficiency treatment and secondary pollution prevention are achieved.

The invention discloses a dual-channel radially distributed expandable mechanical seal device, which relates to the technical field of mechanical dynamic seals, including a shell, an inner ring, a ceramic seal ring and a flexible dynamic seal mechanism. A pair of liquid inlet and return expansion ports are arranged on the device, which are distributed at 180° with the original liquid inlet and return ports, so as to reduce the flow resistance and expand the flow capacity of the device, and the flow capacity is significantly increased. It will rotate, and the relative position of the inlet and return ports will change periodically. Therefore, in order to reduce the fluctuation of liquid flow during the rotation process; at the same time, there is a flexible dynamic seal structure inside the device. In order to improve the reliability and life of the flexible dynamic seal, it is necessary to select a suitable compound In addition to the flexible sealing form and installation structure, ceramic materials are sprayed on the surface of the matching metal parts to improve its hardness and wear resistance, and a set of dual-channel radial distribution systems that can adapt to harsh environments such as vibration, shock, and wide temperature range is provided. Expandable mechanical seal.