10results about How to "Avoid stress changes" patented technology

The invention relates to the field of oilfield chemical drilling fluid treatment agents, and discloses a chitosan grafted copolymer, a preparation method thereof and a drilling fluid, the chitosan grafted copolymer has a structure as shown in formula (I), and the number-average molecular weight is 200000-600000; m is 1200 to 3500, and X and Z are respectively and independently H or-R1COOM1 or a polymeric chain segment; wherein R1 is alkylene of C1-C5, and M1 is H, Na or K; the polymeric chain segment contains a structural unit A and a structural unit B, the structural unit A contains at least two-COOM2, M2 is H, Na or K, and the structural unit B contains a cyclic lactam structure; y is H or a quaternary ammonium salt structure with an ester group. The chitosan grafted copolymer provided by the invention has relatively good wall fixing performance and filtrate loss reduction performance, and ensures well wall stability of easy-to-collapse stratum of shale fracture zone from two aspects of wall fixing and filtrate invasion reduction, # imgabs0 #

The application discloses a machine tool center bracket and a using method, which comprises a ring-shaped frame and a plurality of supporting components arranged on the ring-shaped frame, the supporting components are used for supporting workpieces located on the inner side of the ring-shaped frame, each supporting component comprises a sleeve, a main supporting claw and two auxiliary supporting claws; the sleeve is integrally arranged on the ring-shaped frame, and the sleeve is provided with a first adjusting component; the main supporting claw is movably sleeved in the sleeve, the first adjusting component is used for adjusting the position of the main supporting claw in the sleeve, the inner end of the main supporting claw towards the center of the ring-shaped frame is provided with an expansion piece, the distal end of the expansion piece is movably provided with a first roller, and the inner portion of the main supporting claw is provided with a second adjusting component; the two auxiliary supporting claws are movably and symmetrically arranged on the two sides of the main supporting claw, the second adjusting component is used for synchronously adjusting the included angle between the two auxiliary supporting claws and the main supporting claw, and the distal ends of the two auxiliary supporting claws are respectively movably provided with second rollers. In general, the application has the advantages of novel structure, convenient use, safety and stability and the like.

The invention discloses a high-temperature and high-pressure gas-containing turbine experimental device, comprising a dynamometer connected to a hydraulic turbine, a liquid storage tank, a liquid supply tank with an electric heating tube, a pressure-stabilizing tank, a gas storage tank, a hot water heat pump unit with a tube bundle heat exchanger, an expansion tube made of a magnetophilic metal, and an electromagnetic mixing device, wherein the pressure-stabilizing tank is placed on a vertically adjustable lift; the electromagnetic mixing device is composed of a magnetic wheel and a magnetic component matched with the magnetic wheel, and the magnetic component is externally connected to a power supply; the magnetic wheel is placed in the inner cavity of the expansion tube, and the magnetic component is sheathed on the periphery of the expansion tube. The device can be used to study the flow of gas-containing hydraulic turbines under high temperature and high pressure and the working mechanism of gas-containing hydraulic turbines.

The steering column comprises a steering column assembly, an installation assembly, a locking assembly and a protection assembly, the installation assembly is movably connected with the steering column assembly through a pin shaft, a locking mechanism is movably connected into the installation assembly, the locking assembly is rotationally connected with the top of the installation assembly, and the protection assembly is arranged on the steering column assembly. The locking assembly is in transmission connection with the locking mechanism, a disengaging mechanism is arranged at the end of the locking assembly, and the protection assembly is fixedly installed on the surface of the installation assembly. Relative movement is achieved through cooperation of the steering sleeve and the telescopic sleeve, the locking assembly is automatically disengaged when collision occurs, the safety performance of a driver is improved as much as possible, rotation of the handle is achieved through the protection assembly, telescopic and angle synchronous adjustment of the upper steering shaft can be achieved, and the driving safety performance can also be improved; buffering protection after the steering wheel rotates in place is achieved by arranging the buffering assembly, and the service life of the steering column can be effectively prolonged.

The utility model relates to a retarder, in particular to a maintenance-free, pressure-regulation-free and impact-preventing retarder, and aims to solve the problems that the maintenance operation of the conventional retarder in an overhaul period is completed manually, the maintenance period is long, and the workload of maintenance personnel of the retarder is reduced. The pressure valve inner spring and the pressure valve outer spring are coaxially arranged in the spring containing groove, the pressure valve rod is vertically arranged in the piston head, the bottom end of the piston is connected with the impact stopping base, the pressure valve seat is sleeved with the speed valve plate and the speed valve spring, and the outer circle face of the piston head is sleeved with the supporting ring. The return stroke valve plate is arranged on the piston between the piston head and the sealing cover in a sleeving mode, the self-lubricating bush is arranged at the opening end of the top of the self-lubricating dustproof shell in an embedded mode, a self-lubricating dustproof ring is arranged at the top of the self-lubricating bush, and the sliding oil cylinder is arranged at the opening end of the top of the self-lubricating dustproof shell in a sliding and sealing mode. And the punching stopping seat is clamped at the bottom end of the self-lubricating dustproof shell through the punching stopping pin. The utility model belongs to the technical field of parking retarder.

The invention relates to the technical field of optical cable monitoring, in particular to an on-line optical cable monitoring device based on a geographic information system, which is characterized in that a sealing gasket is arranged in a junction box main body, a cavity is formed in the junction box main body, warm-keeping cotton is arranged in the cavity, and a sealing plate is arranged at the bottom of an upper cover; the junction box has the beneficial effects that after an optical cable is connected to a wiring end, the junction box main body is matched with the upper cover to seal the wiring end of the optical cable, and the sealing plate arranged at the bottom of the upper cover is matched with the sealing gasket arranged in the junction box main body to seal a matched gap between the upper cover and the junction box main body; by means of the warm-keeping cotton arranged in the cavity formed in the junction box body, the problem that the stress of the optical fiber is changed due to the fact that the optical cable wiring end in the junction box body is affected by weather in winter can be solved, and therefore the labor amount of workers is increased. When an optical cable detection device detects the optical cable, the optical cable needs to be maintained continuously, which is troublesome.

The application relates to the technical field of drainage devices, and a multifunctional negative pressure drainage ball, which comprises a negative pressure ball body, liquid inlet and liquid outlet arranged at two ends of the negative pressure ball body, a liquid inlet pipeline and a pressure adjusting device, one end of the liquid inlet pipeline is connected with the liquid inlet through a three-way pipe, a pressure gauge is connected to the three-way pipe, the pressure adjusting device is connected to the liquid inlet pipeline, the pressure adjusting device comprises a scale cylinder and a piston rod, the piston rod is slidably connected with the scale cylinder, one end of the scale cylinder away from the piston rod is connected with the liquid inlet pipeline and a cleaning liquid container through a connecting pipe and a cleaning pipe, first and second valves are respectively arranged on the connecting pipe and the cleaning pipe, and third and fourth valves are respectively arranged at two ends of the connecting position of the liquid inlet pipeline and the connecting pipe. The application can effectively improve the stability and smoothness of the drainage operation.

The utility model relates to the technical field of rotary kilns, in particular to a kiln head cyclone sealing device. According to the technical scheme, the sealing device comprises a kiln head, a sealing cover, a sealing cover and a supporting ring plate, an opening is formed in one end of the kiln head, the supporting ring plate is arranged in the opening, the sealing cover is arranged at one end of the kiln head, a mounting ring groove is formed in one end of the sealing cover, and a sealing ring is arranged between the supporting ring plate and the sealing cover. A sealing cover is arranged at one end of the kiln head, and a pressure sensor is installed in the upper end of the sealing cover in an embedded mode. The sealing between the sealing plate and the kiln head is increased through the sealing ring and the pressurizing ring groove, the sealing cover conducts secondary sealing on the opening, leaked pressure and substances are intercepted, the pressure sensor detects the sealing condition of the sealing plate, and workers of a warning terminal replace and maintain the damaged sealing ring in time.

The invention discloses a wind driven generator blade detection device, and relates to the technical field of wind driven generator blade detection, the wind driven generator blade detection device comprises a mounting rack, the upper surface of the mounting rack is fixedly connected with an electronic level meter, the other side of the upper surface of the mounting rack is fixedly connected with a control module, and the middle part of the mounting rack is provided with a detection probe; the lower end of the detection probe extends to the lower side of the mounting frame, a fixing mechanism is arranged on the upper side of the mounting frame, a heat dissipation mechanism is arranged on the lower side of the mounting frame, motors are fixedly connected to the two sides of the front side of the mounting frame, and balancing weights are fixedly connected to the output ends of the motors; by arranging the mounting rack, the detection probe, the suction cup and other structures, the detection probe is stably arranged on the surface of the fan blade, the device can continuously monitor the fan blade along with deflection of the fan blade, and the device has the advantages of being high in practicability and capable of reducing errors caused by inertia during detection.

The invention relates to the technical field of steam turbine cylinder body machining, and discloses an auxiliary device for steam turbine cylinder body machining, which comprises a shell, a water sprayer is arranged on the shell, the water sprayer is used for spraying water to a tank body in machining, a lifting device is further arranged in the shell, and the lifting device is used for driving the water sprayer to slide back and forth on the shell. According to the auxiliary device for steam turbine cylinder body machining, by arranging the lifting device, a water sprayer on the shell can conduct automatic height adjustment in a reciprocating circulating mode, so that the height can be changed in the tank body machining process, and compared with traditional fixed-point spraying, the tank body can be better cooled and washed; and meanwhile, the requirement for sliding of the lifting device is met through the driving mechanism, the requirement for kinetic energy is reduced, the machining cost is further reduced, and by arranging the adjusting mechanism, the water sprayer can be intermittently close to or away from the machining cylinder body while the sliding stability of the water sprayer is improved in an auxiliary mode.