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150results about How to "Stable friction" patented technology

Composite fracturing and uniform permeability-improving method for tree-like boreholes in coal seams of underground coal mine

The invention discloses a composite fracturing and uniform permeability-improving method for tree-like boreholes in coal seams of an underground coal mine. The composite fracturing and uniform permeability-improving method is suitable for permeability improvement of soft low-permeability coal seams, and is characterized in that a gas exhausting and mining hole serve as a mother hole, uniformly distributed self-advancing boreholes serve as tree-like son boreholes, and a tree-like borehole net is subjected to hole-sealing fracturing. Compared with a conventional hydraulic fracturing method, the composite fracturing and uniform permeability-improving method can realize uniform fracturing of the low-permeability coal seams to enlarge the fracturing range of single crossing boreholes, so that uniform permeability improvement is achieved, and the shortcomings that the crossing boreholes subjected to conventional hydraulic fracturing are low in utilization ratio, and a single major fracture can damage top and bottom beds are overcome. The composite fracturing and uniform permeability-improving method is simple to operate, large in permeability improvement range and good in permeability improvement effect and provides a guarantee for safety production of the underground coal mine.
Owner:CHONGQING UNIV

Mechanical damping passive pay-off unit

The invention discloses a mechanical damping passive pay-off unit. The mechanical damping passive pay-off unit comprises a pay-off wheel and a center shaft, wherein the center shaft is located in thecenter of the pay-off wheel and penetrates through the pay-off wheel. Damping mechanisms are arranged on the two sides of the center shaft respectively. The mechanical damping passive pay-off unit isscientific and reasonable in structure, and safe and convenient to use; because of the damping mechanisms, friction is generated through contact between each damping fin and the corresponding rotary plate, the pay-off speed of the pay-off wheel can be controlled, and the pay-off wheel can carry out pay-off work stably; because of connecting rods, lead screws, threaded rods and nuts, the separationdistance between each threaded rod and the corresponding nut is adjusted by turning the corresponding lead screw to adjust the gluing force between the corresponding damping fin and the correspondingrotary plate, then friction is changed to achieve the effect of having control over the rotating speed of the pay-off wheel, pay-off is smooth and steady, and the tension of cables is kept as well; and because adjusting gears are driven by rotary shafts to rotate, then racks are driven to move upwards or downwards to enable each positioning toothed plate and the corresponding gear to be separatedor be in engagement connection, the gears can rotate freely when each positioning toothed plate and the corresponding gear are separated, and when each positioning toothed plate and the correspondinggear are separated, the gears are locked, the pay-off wheel is locked as well, and the mechanical damping passive pay-off unit is more convenient to use.
Owner:NANJING INST OF RAILWAY TECH

High-performance clutch plate for heavy truck

The invention provides a high-performance clutch plate for a heavy truck. The high-performance clutch plate for the heavy truck achieves the technical purposes of being novel in structure, reasonable in material formula and balanced and excellent in performance index, cost and application effect. The high-performance clutch plate for the heavy truck is divided into a friction working layer and a structural layer. The friction working layer comprises at least three friction linings made of different materials. The three friction linings made of the different materials comprise the rubber-based friction linings, the substitute rubber FA friction linings and the ceramic fiber friction linings, all of which are of the same thickness. The high-performance clutch plate has the following beneficial effects that due to the fact that the rubber-based friction linings, the ceramic fiber friction linings and the substitute rubber FA friction linings are arranged on the surface of the structural layer in a mixed manner, in clutch operation of the clutch plate, the characteristics of the three different materials can be brought into play, when the clutch plate is applied to a clutch mechanism of the heavy truck, friction force resistant to attenuation and stable at high temperature is effectively reduced, and the high-performance clutch plate is particularly suitable for being applied to the heavy truck.
Owner:浙江科马摩擦材料股份有限公司

Vacuum high-temperature friction-wear tester

The invention relates to material surface performance test equipment, and particularly relates to a vacuum high-temperature friction-wear tester. The tester is characterized in that a vacuum cover isarranged above a machine base, a force measuring assembly, an adjusting support, a heating furnace assembly and a cooling circulation system are arranged in the vacuum cover, the cooling circulation system is connected above the machine base, the heating furnace assembly is arranged in the cooling circulation system, a supporting connecting pipe is arranged at the left end of the vacuum cover, theadjusting support is connected in the supporting connecting pipe, the left end of the force measuring assembly is connected to the adjusting support, the right end of the force measuring assembly isconnected with a loading rod, the loading rod penetrates through the force measuring assembly, the heating furnace assembly comprises a furnace body, a heating cavity is formed in the furnace body, the loading rod is inserted into the heating cavity, a friction disc is arranged in the heating cavity, a detection piece is clamped between the loading rod and the friction disc, the lower end of the friction disc is connected with a rotating shaft, the rotating shaft penetrates through the heating furnace assembly and the cooling circulation system, the lower end of the rotating shaft is rotationally connected into the machine base, and the side wall of the vacuum cover is further connected with a molecular pump unit.
Owner:兰州华汇仪器科技有限公司

Bridge pier column detection device and method

The invention provides a bridge pier column detection device and method, and the device comprises: a climbing device which surrounds and is detachably disposed at the periphery of a pier column, and is used for moving up and down along the pier column; and a surrounding detection device which is arranged at the upper part of the climbing device and is used for carrying out surrounding detection on the pier column, wherein the climbing device is uniformly connected with a plurality of brackets, and the surrounding detection device is connected with the climbing device through the brackets. The brackets are connected with a plurality of cameras which are uniformly distributed, and the plurality of cameras jointly capture full-angle images of the pier stud; the climbing device is of a modular structure and comprises a plurality of climbing assemblies which are assembled in a matched mode according to the diameter of a pier column; and the climbing device, the surrounding detection device and the camera are all electrically connected with the comprehensive control equipment, so that movement control over the climbing device is achieved, and data detected and captured by the surrounding detection device and the camera are processed and displayed.
Owner:JIANGXI PROVINCE TIANCHI HIGHWAY TECH DEV +1
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