995results about How to "Avoid direct impact" patented technology

The invention relates to the technical field of high voltage and insulation, in particular to a device for researching and testing an insulating property of high-voltage oiled paper. Aiming at the positions of frequent faults during the operation of a converter transformer, the device simulates a ball-board, a needle-board, a board-board, faces and suspension discharge electrode models; and the typical high-voltage oil/oiled paper insulating experiments can be realized under direct current (DC) voltage, alternating current (AC) voltage and AC-DC voltage so as to acquire partial discharge characteristics and breakdown characteristics of the major insulation of the converter transformer.

The invention relates to a prefabricated part of a composite abrasion-resistant part and a method for manufacturing the abrasion-resistant part with the same. The prefabricated part is formed by mixing metal powder with carbide ceramic particles or particles by crushing a hard alloy and sintering the mixture at a high temperature and can be made into special shapes of columns, strips, blocks, honeycombs, and the like. The method comprises the following steps of: regularly arranging prefabricated parts on the end surface of a cast form; casting liquid metal by adopting a common or negative pressure cast method; impregnating the liquid metal into the prefabricated parts to form an abrasion-resistant part of a composite material, wherein the surface layer of the abrasion-resistant part comprises a matrix metal and a composite material. The abrasion-resistant part of the composite material, which is made by using the method, ensures the wear-resistant performance of the abrasion-resistant part and has high anti-impact capability.

The invention relates to the field of the electric system technology, in particular to a net rack optimization method for a multi-direct-current centralized fed receiving end power grid. According to the method, the network voltage supporting capacity of the receiving end power grid, the short-circuit current control effect of the receiving end power grid and the short-circuit current control measure cost of the receiving end power grid are all considered. The method includes the steps of taking the maximum multi-direct-current feeding comprehensive short-circuit ratio, the maximum short-circuit capacity comprehensive margin and the minimum total cost of investment of current limiting measures as three objective functions, building a multi-objective optimized mathematical model which includes the three objective functions and power grid constraint conditions, and utilizing an NSGA-II multi-objective genetic algorithm to carry out the multi-objective optimization method. A result provided through the method is a line unlocking or series reactor added combining scheme, and the power grid can have strong voltage supporting capacity and system stability on the basis of controlling of a short-circuit current through moderate cost. The method has strong adaptability to an existing receiving end power grid optimization scheme.

The invention discloses an ecological comprehensive treatment system of a northern mountain river channel. The system comprises three sub ecological systems of an ecological permeable dike built on the upstream of a main stream and a branch stream of a mountain river, a reservoir pond arranged at the middle and downstream area of the mountain river and a wet land communicated with the reservoir pond, and adopts an ecological treatment mode of closure-storage-preservation. The construction method comprises the steps of: a) building of the ecological permeable dike; b) setting of a triangular pyramidal wood pile stone cage; c) building of the reservoir pond; d) planting of plants of the reservoir pond; e) building of a wet land system; and f) recovery of a river bank band. The system and the construction method can effectively intercept the mountain debris flow and the river non-point source pollution, adjust the river runoff, improve the hydrologic conditions of the mountain river in non-flood season, decrease the dry season of the mountain river, and facilitate to recover the ecological system of the mountain river. Meanwhile, traditional depressions and empty ponds in the mountain river can be used in construction, so that the engineering building cost is reduced, and the self-cleaning capacity of river water is improved.

The invention relates to a multi-parameter adjustable spray flow experimental system which comprises an air source module, a flow control valve, a vortex flow meter, a water storage tank, a metering pump, a frequency converter, an atomizing and mixing section, a liquid film collection device, a light extinction granulometer and a throttling valve, wherein air provided by the air source module is fed into the atomizing and mixing section via the flow control valve, and the gas phase flow rate is metered by the vortex flow meter; water provided by the water storage tank is adjusted by the metering pump and the frequency converter and then atomized by a high-pressure nozzle so as to form micro-scale droplets to enter the atomizing and mixing section, the water flow is controlled by the metering pump, the metering pump is used for performing flow control by virtue of a combination of two manners such as frequency modulation and stroke adjustment, and the frequency is continuously adjustedby the frequency converter; and after forming the spray flow on the atomizing and mixing section, the gas phase and the liquid phase enter the liquid film collection device, and by virtue of control and measurement of gas displacement by the throttling valve, the particle size and concentration of droplets in the pipeline are measured by the light extinction granulometer via the liquid film collection device.

The invention belongs to the field of livestock and poultry processing machinery and relates to a device for pickling eggs. The device comprises a pickling liquid circulation system, a pickling tank, a pressurization system and a control system (33), wherein the pickling liquid circulation system can be used for recycling pickling liquid, so that solution waste and environmental pollution can be avoided, and the production cost can be reduced; an exhaust electromagnetic valve (31), a muffler (32), a pressure sensor (29) and a safety valve (27) of the pickling tank are all arranged at the upper part of a pressure vessel cover (28), so that the direct corrosion damage caused by the pickling liquid can be reduced; a bubble breaking plate (18) of the pickling tank can be used for breaking bigbubbles, so that the eggs are prevented from being directly impacted by the bubbles, and the rate of finished products can be guaranteed; and the pressurization system is respectively used for supplying air for a liquid storage tank (2) and a tank body (22) of the pickling tank from the bottom to stir the pickling liquid so that the pickling liquid in the device for pickling the eggs is uniform, and the processing quality of the eggs can be guaranteed. The device for pickling the eggs solves the problem of mechanical and industrialized egg pickling production, and is suitable for pickling salted eggs and preserved duck eggs industrially in a large scale.

The invention provides a split self-suction type Venturi tube washer which comprises an outer sleeve mainly comprising a contraction section and an expanding section, and further comprises a conical independent contraction section, wherein the conical independent contraction section is of a conical structure and is the same as the contraction section of the outer sleeve in shape, the conical independent contraction section is sleeved in the contraction section of the outer sleeve, and is connected with the contraction section of the outer sleeve through flanges at respective inlet ends, an annular liquid flowing channel is formed between the conical independent contraction section and the contraction section, a liquid sucking hole is formed in the contraction section of the outer sleeve, and an outlet baffle plate is arranged at the outlet end of the expanding section of the outer sleeve. Compared with a common Venturi tube washer, the split self-suction type Venturi tube washer is higher in removing efficiency. The split self-suction type Venturi tube washer is suitable for being used as a Venturi tube washer required by a filtration and emission system of pressurized water reactor containment, and is also suitable for an industrial dust removing process.

The invention relates to a protective device combined by fabricated explosion-protection wall and turnover road needle, belonging to the structure engineering field. Two fabricated explosion-protection walls are combined with a turnover road needle respectively to form the protective device. Two explosion-protection walls all adopt double-layer steel face plate with internal reinforced rib. According to setting demand and weight sand and concrete are filled in it respectively. Two adjustable oblique braces are set at the back of each component. The turnover road needle has two statuses. When it is put up it is the road block to prevent vehicle impacting object directly and when it is put down it is the vehicle decelerating device. The combined device can prevent or decrease the damage effect to building structure by impact explosion of vehicle bomb. It can separate or block the protective object and the explosion source as far as possible. It can be set quickly and neatly according to different threat levels and important degree for object. It is suitable for building with design performance opened to the outside world and important building without conditions to preset protective establishment round.

The invention provides a novel box-type transformer which comprises a box body and a transformer body arranged in the box body. The box body is composed of a box bottom, four side walls and a box top, wherein one side wall is provided with an access door, ventilating windows are formed in the four side walls of the box body, a bent portion is arranged on one side of each ventilating window, ventilating openings are formed in the side walls, exhaust fans are arranged at the positions of the ventilating openings, and a waterproof rain shield is arranged on the box top. The novel box-type transformer has the advantages of being scientific in design, good in practicability, simple in structure, good in heat dissipation performance, good in ventilation performance and good in waterproof effect.

The invention discloses a steam generator of a washing machine and a rotary drum washing machine with the steam generator. The steam generator is of a long column drum structure, a water space capable of storing water is arranged at the lower part of the long column drum structure, and a steam space capable of storing steam is arranged at the upper part of the long column drum structure and is communicated with the water space. The steam generator of the long column drum structure is mounted between the side wall of a casing and the side wall of an outer drum of the rotary drum washing machine. The steam generator structure effectively utilizes the space of the rotary drum washing machine, can mount the steam generator under the condition that an original structure of the rotary drum washing machine is not changed so as to add the steam generation function for the rotary drum washing, and has simple structure and low cost.

The invention relates to a double-valve-core double-sealing-surface adjusting valve, and in particular to an adjusting valve. The double-valve-core double-sealing-surface adjusting valve comprises a valve body and a cavity, wherein the cavity is formed by encircling of the valve cover; a valve inlet and a vale outlet communicated with the cavity are formed in the valve body; a valve core and a valve base are arranged inside the cavity; the valve core consists of a main valve core and a secondary valve core; a first sealing surface and a second sealing surface matched with the main valve core and the secondary valve core are respectively arranged on the valve base; the main valve core and the secondary valve core are in adjustable fixed connection; when the relative position between the main valve core and the secondary valve core is adjusted, the secondary valve core can be separated from the second sealing surface when the main valve core is clung to the first sealing surface, or the main valve core is separated from the first sealing surface when the secondary valve core is clung to the second sealing surface. Due to adoption of double valve cores and double sealing surfaces, sealing can be achieved by using a secondary sealing pair if a main sealing pair is invalid, and the service life of the valve is effectively prolonged.

The invention discloses a production method of a bilayer structure pellet and production equipment thereof, belongs to the technical field of pellet production methods and equipment, and is used for producing a pellet having an inner-layer structure and an outer-layer structure. The technical scheme is that a mineral aggregate easy to generate an adverse effect on the pelletizing process and the roasting process is put in an inner-layer pelletizing disk to serve as a pellet core, and a mineral aggregate with good pelletizing performance and in favor of roasting is put in an outer-layer pelletizing disk to grow to a pellet, so that the pellet with the inner-layer structure and the outer-layer structure is formed, and the influence on the pellet by the adverse effect of the mineral aggregate is prevented. The method and the production equipment are simple in operation, are flexible in parameter adjustment, and can be adapted to a diversified raw material structure; under the condition of shortage of a high-quality iron ore resource at present, the novel production method and the novel production equipment are provided to realize reasonable resource utilization, to improve pellet quality and to guarantee smooth production; and the production method and the production equipment have positive and prominent effects on the sustainable development and the economic benefit improvement of iron and steel enterprises, and have strong promotion and application values.

The invention discloses a ship body protection device, and relates to the technical field of ships. The device comprises a mounting base. One surface of the mounting base is slidably connected with afixed frame; a combined damping mechanism is fixed to the bottom of the inner wall of the fixed frame; the combined damping mechanism is slidably connected with a pressure relief buffer mechanism; anda pressure bearing piece is fixed to the end, located outside the fixed frame, of the pressure relief buffer mechanism, a guide rod is fixed to one surface of the pressure bearing piece, one end, away from the pressure bearing piece, of the guide rod penetrates through the fixed frame and extends into the fixed frame, and a first spring is arranged on the outer surface of one section of the guiderod and located between the fixed frame and the pressure bearing piece in a sleeving mode. According to the ship body protection device, when a ship body is collided, absorption of an impact force can be effectively completed, the impact force and vibration transmitted to the ship body are reduced, a damage impact is effectively absorbed, excessive damage to the ship body is avoided, vibration generated during ship body collision can be effectively reduced, and a good protection effect is achieved on equipment and personnel on the ship body.

The invention discloses an efficient condenser which comprises a shell. A condensation heat exchange area and a supercooling area are formed in the shell from top to bottom through a plurality of heat exchange pipes and a supercooling pipe. The condensation heat exchange area is divided into an upper layer and a lower layer. The heat exchange pipes on the upper layer and the lower layer are separated by a fluid baffle penetrating through supporting plates. The whole fluid baffle tilts by 10-15 degrees towards one side in the width direction. The condensation heat exchange area and the supercooling area are separated by a supercooling area upper sealing plate covering the supercooling area. According to the efficient condenser, due to the fact that the fluid baffle is arranged between the upper layer and the lower layer of the condensation heat exchange area and the supercooling area upper sealing plate is arranged between the condensation heat exchange area and the supercooling area, the thickness of fluid films outside the heat exchange pipes below the fluid baffle is effectively reduced, the heat exchange performance of the supercooling area is enhanced, and the energy efficiency of a refrigeration system is obviously improved.

The invention discloses a classified processing device for construction wastes and relates to the field of garbage classified processing. The classified processing device for construction wastes comprises a crushing box and a screening box. The crushing box is provided with a pair of crushing rollers, buffer plates are arranged on two side walls of a feed inlet of the crushing box, a first guidingbelt is arranged right below the two crushing rollers, an electric absorbing magnetic roller is arranged on the upper side, close to the lower end, of the first guiding belt, and a third guiding beltwhich is horizontally arranged is arranged below the lower end of the first guiding belt. When the classified processing device for construction wastes works, the electric absorbing magnetic roller is electrified and magnetized to absorb crushed metals in crushed garbage conveyed on the first guiding belt, and when the electric absorbing magnetic roller rotates, the metals bonded to the outer wall of the electric absorbing magnetic roller fall onto a hanging plate as being scratched by the hanging plate. Then the crushed metals scratched by the hanging plate are conveyed by the second guidingbelt and are exported and collected, so that the separating efficiency is high.

The invention discloses a cement supply online calibration system of stable soil plant mix equipment, comprising an inclined frequency-conversion spiral feeder, a calibration bin, a detection unit 1, a detection unit 2 and a control system, wherein the detection unit 1 and the detection unit 2 are both connected with the control system. The calibration bin is fixed at the upper part of the inclined frequency-conversion spiral feeder and used for temporarily storing and buffering supplied cement to prevent the cement from directly impacting the inclined frequency-conversion spiral feeder; the detection unit 1 is used for detecting the change value Q1 of cement weight in the calibration bin before and after the calibration; the detection unit 2 is used for detecting the instant cement flow value of a discharging hole of the inclined frequency-conversion spiral feeder; and the control system is used for correspondingly controlling the rotate speed of the inclined frequency-conversion spiral feeder according to calibration coefficient obtained from real-time analysis and processing. The invention has reasonable design, simple and convenient operation and high calibration precision, and can overcome the defect that the cement calibration of prior stable soil plant mix equipment is achieved only by manpower, is difficult to operation and has low calibration precision.

The invention discloses a weightlessness-principle-based powdery material continuous metering control method and a device thereof. The device relates to a weightlessness balance and comprises a storage bin and a weighing bin which are arranged from top to bottom and communicated by virtue of a material conveying channel, wherein the material conveying channel between the storage bin and the weighing bin is provided with an upper pneumatic gate valve and a lower pneumatic gate valve which are used for controlling make-break of the material conveying channel, the material conveying channel between the storage bin and the weighing bin is also provided with a surge bin in a serial connection manner, the upper pneumatic gate valve is arranged on the material conveying channel between the storage bin and the surge bin, and the lower pneumatic gate valve is arranged on the material conveying channel between the surge bin and the weighing bin. By controlling opening and closing of the upper pneumatic gate valve and the lower pneumatic gate valve, material flows into the weighing bin by virtue of the surge bin, the storage bin is prevented from directly impacting the weighing bin, and the influence on the measuring accuracy of a weighing sensor is avoided.

The invention discloses a measuring and calculating method for the length of a deep pool segment of a step-deep pool type debris flow drainage canal. According to the measuring and calculating method, firstly, the unit weight of a debris flow body, the designed longitudinal slope of the drainage canal, the casting angle of debris flow, the designed suspension height of a step segment, the designed width of the drainage canal and the designed peak flow of the drainage canal are determined; then the roughness factor of the drainage canal, the permissible velocity and the overflowing mud depth of the debris flow are determined; afterwards, the average velocity of a debris flow cross section is determined, and the permissible velocity is compared with the average velocity of the debris flow cross section; and finally, the length of the deep pool segment of the step-deep pool type debris flow drainage canal is determined through a measuring and calculating formula of the deep pool segment. Proceeding from the complete movement process of fluid in the canal, the method is based on strict theoretical derivation, and the influence of the properties of the debris flow on the casting range is considered in combination with experiments, so that the length of the deep pool segment of the step-deep pool type debris flow drainage canal is determined reasonably, and a basis is provided for the design of the step-deep pool type drainage canal; the precision of a calculated result is high; the method is adapted to the actual requirement of engineering.

The invention relates to a PDM (positive displacement motor) drilling tool for well drilling, comprising a bypass valve assembly, a motor assembly, a universal shaft assembly and a driving shaft assembly, wherein the driving shaft assembly comprises a driving shaft shell, a driving shaft and a whole floating type thrust bearing; the whole floating type thrust bearing comprises a bearing shell, a plurality of bearing moving rings and a plurality of bearing static rings; a shaft sleeve is arranged between every two bearing moving rings; the bearing moving rings and the bearing static rings are all fastened and sleeve the driving shaft; two bearing static rings sleeve each shaft sleeve at intervals; an annular flange is formed on the inner wall of the bearing shell positioned between every two bearing static rings; a shock-absorption energy storage body is respectively arranged between the annular flange and every two bearing static rings; a plurality of long slots are formed in the lateral wall of each bearing static ring along the axial direction of the bearing shell; a bolt is connected with the position, corresponding to each long slot, of the bearing shell; the end part of each bolt extends into the corresponding long slot; each bearing static ring is matched with the corresponding bearing moving ring through two diamond compacts; one diamond compact is arranged on the corresponding bearing static ring; the other diamond compact is arranged on the corresponding bearing moving ring.

A rock impact resistance spring lattice debris flow blocking structure comprises connecting nodes (5), wherein a plane groined structure consisting of I-shaped steel columns (1) and I-shaped steel beams (2) is arranged at the front part of an incident flow surface; the front I-shaped steel columns (1) and the I-shaped steel beams (2) are parallel to the incident flow surface with a reinforced concrete dam body at the rear part; springs (3) are arranged at groined beam column nodes and are perpendicular to the groined structural plan at the front part and the incident flow surface of the reinforced concrete dam body (6) at the rear part; spring protection sleeves (4) are arranged at the groined beam column nodes and are round steel pipes matched with the diameters of the springs; the spring protection sleeves (4) are pre-buried in corresponding positions of the incident flow surface of the corresponding reinforced concrete dam body (6); the two ends of the springs (3) are arranged at the groined beam column nodes and in the spring protection sleeves (4) of the reinforced concrete dam body (6); and the lower ends of the I-shaped steel columns (1) are fixed on a foundation of the reinforced concrete dam body (6).

The invention provides a system for visually evaluating a production and blockage law of hydrate in a screen and a testing method thereof. An experimental system for testing a secondary production, enrichment and blockage law of the hydrate in a screen mesh comprises a reaction kettle, a gas-liquid mixed conveying coil, a high-speed camera, a data acquisition and processing module and the like. The testing method is based on the system, and through adjustment of a cooling mode and control of a temperature and pressure condition and a gas-liquid ratio condition, a three-dimensional chart of thesecondary production and blockage of the hydrate in the screen mesh is simulated; the system can provide basic data for calculation of a well-bottom screen sand control additional skin factor and formulation of a precise pressure-reducing and temperature-controlling scheme under different well body structure conditions (a vertical well, a horizontal well or a multi-branch hole) of a natural gas hydrate production well, and provides a strong support for a sand production management system of the natural gas hydrate production well.