149results about How to "Avoid severe wear and tear" patented technology

The invention relate to a control technique of the rolling process of a rolling steel. The invention discloses a control method of a rough rolling intermediate billet camber. The control method combines a position control with a pressure control; in a multi-pass rolling of the positive-pass and reverse-pass of a roughing mill, the camber generation of the intermediate billet is restricted. The control method of the invention can reduce the additional value of the openness of a side guide plate, leads the flexible deformation of the intermediate billet between the inlet and the outlet of the roughing mill in the horizontal direction to be restricted by the side guide plate, reduces the camber of the intermediate billet, and prevents the severe abrasion which is caused by the long-term contact of the side guide plate and the intermediate billet.

The invention provides an intelligent control system and a control method for a scraper conveyer, which belong to the intelligent control systems for coal mine exploitation. The intelligent control system for the scraper conveyer comprises a laser scanning ranging device, a ray ranging transmitter, an ultrasonic level sensor, a current transducer, a master controller, a variable frequency and speed regulation controller, a coal crushing controller, a conveyor gesture controller and a conveyor chain stretching controller, wherein the laser scanning ranging device, the ray ranging transmitter, the ultrasonic level sensor and the current transducer transmit detection signals to the master controller in a wireless communication manner, and the master controller sends control instructions to the variable frequency and speed regulation controller, the coal crushing controller, the conveyor gesture controller and the conveyor chain stretching controller in the wireless communication manner. The running state of the scraper conveyer is mastered at any time and corresponding devices are controlled timely through monitoring of the laser scanning ranging device, the ray ranging transmitter, the ultrasonic level sensor and the current transducer, so that the scraper conveyer can be operated in an optimum running state.

The invention relates to a plasma drilling bit in the field of drilling bit tools. The technical scheme adopted by the invention is that a fluid passageway and an electrode through hole which respectively and axially communicated are preformed in a bit body; a high-voltage positive electrode and insulators are fixedly connected with the interior of the electrode through hole; the bottom part of the bit body is fixedly connected with an annular ground electrode; the bottom part of the high-voltage positive electrode is provided with a high-voltage panel mounting electrode; an annular interelectrode gap is reserved between the high-voltage panel mounting electrode and the annular ground electrode. The bit penetrates a plasma channel formed in front of to-be-drilled rock under the high-voltage pulse liquid phase microdischarge action to crush the rock, and does not need to be contacted with the surface of the rock, and mechanical lapping is not needed. The plasma drilling bit disclosed by the invention has the advantages that the abrasion of the bit can be reduced, the rate of penetration is increased, and the required energy is low; compared with the conventional mechanical rotary bit, the plasma drilling bit is low in cost and high in efficiency, and can also be applied to industry of mining and the like.

The invention relates to a low-temperature low-pressure desulfurization wastewater evaporation treatment device and process. The device comprises a flue gas treatment system and an evaporation and crystallization system, wherein in the evaporation and crystallization system, flue gas form a dust collector is utilized to heat the circulating wastewater; a high-pressure atomizing nozzle and an air washer are arranged in an evaporator and are respectively used for atomizing the heated wastewater and washing steam; wastewater supernate is utilized to condense the generated steam; and the evaporated and concentrated slurry is sprayed into a flue duct after an air preheater, is evaporated and crystallized, and is removed by the dust collector. The device can be used for purifying power plant desulfurization wastewater and similar sewage. The related flash evaporation condition is a low-temperature low-pressure state, so that corrosion of wastewater for the evaporation system can be greatly reduced, the equipment is effectively prevented from scaling and slagging, the energy utilization is improved by utilizing the flue gas treatment system, salt and water separation can be achieved for a final product, and zero emission of desulfurization wastewater can be realized.

The invention relates to a double-head claw pump rotor and its molded line. The molded line comprises an equidistance curve of a point meshing epicycloid, a modified arc segment, a tooth top arc segment, an intermediate connecting arc segment, an arc conjugate curve segment, and a tooth root arc segment. Two rotors adopt a central symmetrical structure. By setting the modified arc segment, the sharp points are eliminated, and severe wearing phenomenon of the rotors during operation can be avoided. The equidistance curve of the point meshing epicycloid and the modified arc segment are always spaced apart to avoid the formation of suction and exhaust closed volume, and a design parameter space of the rotor molded line is increased, the power consumption is reduced, and the pump efficiency isimproved. The molded line is designed in the double-head claw pump, compared with the other conventional pumps, the pump in the invention has the advantages of less wearing parts, compact structure,high pumping rate, no surge, and low vibration noise.

The invention relates to an ore extraction and transfer device. The ore extraction and transfer device comprises a box and a first driving device; the first driving device is used for driving the boxto move so as to transport ores to an appointed place; a feed port is formed in the top of the box; and an ore crushing mechanism is arranged in the box. The ore extraction and transfer device has thefollowing beneficial effects: the ore crushing mechanism is arranged in the box, so that the ores can be primarily crushed during loading in the box and transporting, the subsequent crushing time canbe shortened, and the working efficiency is improved; and meanwhile, large ores are crushed beforehand, so that the problem of easiness in damage of the box caused by huge collision to the box by thelarge ores due to bumpy roads can be prevented.

The invention relates to a semiaxis type pure-water hydraulic axial plunger pump supported by bearings in a cylinder, which adopts a semiaxis type structure that a sliding bearing supports a cylinder body. The semiaxis type pure-water hydraulic axial plunger pump is characterized in that a front bearing supports an input shaft, and a rear bearing is the sliding bearing in the cylinder and is used for supporting the cylinder body. Due to reasonable bearing distribution, the stressing of the bearings is reduced, and the overturning moments of flow distribution discs are balanced. A distributed type return spring penetrates through the cylinder body and acts on a spherical hinge and a floating lining plate respectively, so that not only is the sealing of a sliding shoe pair and a flow distribution pair guaranteed, but also the abrasion of sliding shoes and the flow distribution discs can be automatically compensated. The flow distribution discs are fixedly arranged on a rear end cover and are sealed by adopting sealing rings so as to avoid leakage of the back surfaces of the flow distribution discs. A plunger pair adopts an automatic gap-compensating type sealing structure so as to reduce leakage of the plunger pair and improve the anti-pollution capability of the pump. The semiaxis type pure-water hydraulic axial plunger pump adopts filtered fresh water or seawater as a working medium, adopts all-water lubrication for all friction pairs, is high in power density, can be used for industrial cleaning, seawater freshening and underwater operation tools and the like and is wide in application prospect.

The invention relates to an automobile painting overturn frame. It solves the problems of unreasonable design and the like in the prior art. The car paint overturning frame includes two symmetrically arranged main supports and the two main supports are connected by connecting rods, and each main support is respectively provided with a vertical support tube and a vertical support tube whose lower end is inserted into the vertical support tube. The lifting column is provided with a rolling contact structure between the lifting column and the vertical support tube, and the upper end of each lifting column is respectively provided with a horizontal fixed tube and the lifting column or the fixed tube is connected with the lifting drive mechanism, The paint spray stand also includes two symmetrically arranged lifting frames, each of which is connected with a rotating shaft inserted in the fixed pipe and capable of rotating relative to the fixed pipe, and is provided between the rotating shaft and the fixed pipe. A locking mechanism capable of locking the rotating shaft and the fixed tube in the circumferential direction when the rotating shaft rotates to a set position. The advantage of the present invention is that it can improve the smoothness of lifting.

The invention discloses an elevator brake adopting a dual-braking system and a braking method of the elevator brake. Safety and stability of an existing elevator brake are poor. The elevator brake comprises a hydraulic end cover, end cover bolts, brake arms, a brake coil, synchronous bolts, an armature, tongue plate bolts, a tongue plate, a brake shoe friction plate, a manual adjusting bolt, guiding bolts, an adjusting anti-loosening spring, a coil groove, brake springs, a brake fixed plate, a hydraulic cylinder, a flat gasket, a spring gasket and a synchronous plate. According to the elevatorbrake and the braking method of the elevator brake, the contact of the brake shoe friction plate and a brake wheel is assisted by increasing the braking friction faces on the brake arms, the brakingarea is increased, and accordingly the braking force is increased. The braking friction faces of the brake arms and the arc face of the brake shoe friction plate on the tongue plate are located on thesame cylinder face, the brake arms and the brake shoe friction plate synchronously move during braking, and accordingly it is guaranteed that the brake wheel is held tightly at the same time; and elevator dual braking can be achieved, elevator slipping or elevator brake movement is prevented, and the braking reliability of the brake is improved.

The invention relates to a self-aligning roller bearing for a main shaft of a wind turbine generator and a design method thereof. The self-aligning roller bearing comprises a bearing outer ring, a bearing inner ring and two rows of rollers; and the self-aligning roller bearing is characterized in that the length of one row of rollers close to a wind wheel side on the self-aligning roller bearing is smaller than that of the other row. The design method of the bearing comprises the steps of: a, establishing a coordinate system; b. calculating stress of the main shaft by utilizing a formula F1=1/2C<F>RhoV<2>; c, calculating stress of the self-aligning roller bearing; d-1, calculating contact stress; d-2, fetching a lower limit value; d-3, fetching an upper limit value; d-4, implementing the calculation by utilizing a difference method, and d-5, calculating a proportionality factor satisfying an absolute value of (U - V) is smaller than 3U/100 or an absolute value of (U - V) is smaller than 3V/100, and designing a bearing meeting the requirement. According to the bearing and a bearing calculation method, the contact stress between each roller and a raceway can be effectively reduced; and a finite element method and the difference method are adopted, so that the difference value between the contact stresses of the two rows of rollers can be controlled within 3 percent, thereby solving the unbalance stress problem of the roller, reducing the failure rate and improving the service life of the bearing.