47results about How to "Not easy to fatigue damage" patented technology

The invention provides a metal damper and a design method thereof, and belongs to the technical field of civil engineering structural shock absorption. The damper comprises an upper cover plate, a lower cover plate and a core energy-consuming metal element. The core energy-consuming metal element is a continuous U-shaped slotted metal plate and comprises a circular arc section and two straight sections. A plurality of continuous grooves are formed in the circular arc section and partial straight sections of the slotted metal plate in the width direction at intervals. In design, firstly, the height of the damper is determined according to a building; secondly, the numerical relationship of the thickness of a steel plate, the length of the straight sections and the width of the damper is obtained according to an in-plane resilience formula and an out-plane resilience formula; specific numerical values of the three parameters are adjusted according to an optimizing formula, so that a failure mode, out of expectation, of the damper does not occur; and ultimately, the number of the dampers and the size of a bolt are determined. According to the metal damper and the design method of the metal damper, energy consumption is achieved through metal materials with strong plastic deformation capacity, large longitudinal deformation is achieved through bending deformation, and large sideward deformability and anti-fatigue performance are achieved.

The invention discloses a prestressed stand for a vertical extruder. The prestressed stand comprises a base, an upper beam, a column sleeve and a pull rod, wherein the base is fixedly mounted on the ground; the upper beam is located above the base; the column sleeve is in a hollow structure and is vertically arranged between the base and the upper beam, and the two ends of the column sleeve are propped against the two opposite end surfaces on the upper beam and the base respectively; the pull rod is vertically arranged; the upper and lower ends of the pull rod pass through the upper beam and the base respectively, and the two ends are pressed against the two end surfaces back on to each other on the upper beam and the base respectively; and the part of the pull rod located between the upper beam and the base is sleeved in the column sleeve. In the invention, the column sleeve and the pull rod are adopted, the two ends of the column sleeve are propped against the two opposite end surfaces on the upper beam and the base respectively, the two ends of the pull rod are pressed against the two end surfaces back on to each other on the upper beam and the base respectively, the column sleeve only bears axial pressure, and the pull rod only bears axial tension, thus the stress on the column sleeve and the pull rod is simple, and the fatigue breakdown is not easily caused.

The invention discloses an expansion joint processing method of a corrugated pipe with rectangular shape and round angle, wherein the manufacturing method comprises the following steps: firstly, the sheet material is processed into a vertical stripe corrugated plate by using a shaping die; secondly, the vertical stripe corrugated plate is processed to a L-shaped or door-shaped buckled corrugated plate by using the shaping die, the round angle at the buckled position is 90 degrees, and the length of a straight edge outside the round angle is no less than 500 mm; lastly, four pieces of L-shaped or two pieces of door-shaped buckled corrugated plates are oppositely welded on the straight edges. The method can avoid the welding seam at the round angle of the corrugated pipe, not only can reduce the welding difficulty, but also can greatly decrease the stress at the round angle, and can be uneasy to be suffered from the fatigue breakdown; by using the method, the production efficiency can be improved, the cost can be reduced, the product quality and the service life can be increased, and the processed expansion joint of the corrugated pipe with rectangular shape and round angle can be used widely in the rectangular conduit to compensate the changes in size.

Provided are an inverted cold-bent U-shaped steel composite beam bridge connected through lacing bars and a construction method. The inverted cold-bent U-shaped steel composite beam bridge connected through the lacing bars comprises a plurality of cold-bent U-shaped steel beams which are arranged in parallel, wherein the cold-bent U-shaped steel beams are provided with prefabricated concrete bridge panels; each cold-bent U-shaped steel beam comprises an upper flange plate and a lower flange plate, webs are arranged between the upper flange plates and the lower flange plates, and the upper flange plates, the lower flange plates and the webs form structures with the cross sections as trapezoids; each lower flange plate comprises two lower flange plate bodies which are arranged at an interval, and the two ends of each two lower flange plate bodies which are arranged at the interval are connected through the corresponding beam bottom lacing bars. According to the inverted cold-bent U-shaped steel composite beam bridge connected through the lacing bars, the force transmission efficiency is high, the flexural rigidity is greatly improved, steel material consumption is saved, and good economic benefit can be obtained; the U-shaped steel beams can be prefabricated and spliced in an industrial mode, so that the construction requirements are fast met; meanwhile, according to the bridge,under the condition that safety, the practicability and economy are achieved, the shape is novel and compact, and the bridge can well harmonize with the environment.

The invention relates to a portable elastic scroll heat exchanger which comprises a left sealing head, a right sealing head, a tube pass inlet pipe, a tube pass outlet pipe, elastic scrolls, a tube pass outlet transverse pipe, a tube pass inlet transverse pipe, mass blocks, a cylinder body, flanges, gaskets, a left tube plate, a right tube plate, a shell pass inlet pipe, a shell pass outlet pipe and connecting pipes. The elastic scrolls are composed of red copper scrolls and the mass blocks. The tube pass outlet transverse pipe and the tube pass inlet transverse pipe are fixedly connected to the left tube plate and the right tube plate correspondingly. The elastic scrolls are connected to the tube pass inlet pipe and the tube pass outlet pipe at equal intervals and are connected with the mass blocks. The cylinder body is fixedly connected between the left tube plate and the right tube plate. The left sealing head and the right sealing head are fixedly connected with the left tube plateand the right tube plate correspondingly, and the gaskets are arranged between the tube plates and the sealing heads and are used for sealing. By means of the portable elastic scroll heat exchanger,strengthened heat transfer is achieved through vibration, the scrolls are made of red copper materials, red copper is not likely to be damaged, the service life is better prolonged, the noise damage is lowered, and the effect of automatically removing the incrustation can also be achieved. Due to the flanges and the connecting pipes arranged on all outlet and inlet openings, single-row / array typecombined installation of multiple heat exchangers can be achieved, and flexible assembling and disassembling can be conducted according to the needs of practical conditions.

The invention relates to a portable plane elastic array scroll heat exchange device. The device comprises a left seal, a right seal, a pipe pass outlet pipe, plane elastic scrolls, a pipe pass inlet pipe, mass blocks, a cylinder, flanges, gaskets, a pipe plate fixed frame, pipe plate end covers, a pipe plate fixed lantern ring, a shell pass outlet pipe, a shell pass inlet pipe, a bracket and a handle. The plane elastic scrolls consist of red copper plane scrolls and the mass blocks; the plane elastic scrolls are arranged to form pipe bundles at equal intervals, and are connected to the pipe plate fixed frame through fixed lantern rings; the mass blocks are connected between the plane elastic scrolls; the cylinder is fixedly connected out of a pipe plate; the gaskets are arranged between the left and right pipe plate end covers and between the end covers and the cylinder for sealing; the left and right seals are fixedly connected with the other ends of the left and right pipe plate endcovers; and the gaskets are arranged between the left and right pipe plate end covers and the seals for sealing. The heat exchange device uses vibration for realizing enhanced heat transfer; the planescrolls adopt red copper, so that copper pipes are not easy to break, the service life is prolonged, the noise harm is reduced, and the effect of automatically removing incrustations can be achieved;through the effect of the mass blocks, the inherent characteristics of the pipe bundles are changed, the vibration characteristics under fluid induction are adjusted, and the effect of strengtheningthe heat transfer through vibration is further achieved; and through arrangement of the flanges and connecting pipes in each inlet and outlet, the single-line / array combined installation of multiple heat exchange devices can be realized, and the flexible assembly and disassembly according to actual condition demands can be achieved.

A folding mobile phone includes a casing with first pin jointed part, and a lid with second pin jointed part. A container formed between the first and second parts, the lid and the casing are jointed by the first and second pin jointed part and relative rotation. The wire is in the container and connected with the casing and the lid.

The invention discloses a prefabricated energy dissipation and damping beam-column joint for a prestressed concrete frame. Angle steel is pre-buried in the upper corners and the lower corners of the two ends of a prefabricated beam, and a reinforcing steel plate corresponding to the angle steel is pre-buried in a prefabricated column; energy dissipation steel bar connectors are arranged on an angle steel supporting plate, perpendicular to the prefabricated column, of the angle steel, and a plurality of energy dissipation steel bar reserved hole passages penetrating through the prefabricated column in the extending direction of the prefabricated beam and corresponding to the energy dissipation steel bar connectors are formed in the prefabricated column; energy dissipation steel bars are arranged in the energy dissipation steel bar reserved hole passages, one ends of the energy dissipation steel bars are connected with the energy dissipation steel bar connectors, and the other ends of the energy dissipation steel bars penetrate out of the prefabricated column to be fixedly connected with a fixing device; and the energy dissipation steel bars and the energy dissipation steel bar reserved hole passages are connected through grout. The prefabricated energy dissipation and damping beam-column joint has the characteristics of being simple in structure, stable in property, practical and effective, damping can be increased to a large extent, and damage to concrete of the beam-column joint is relieved.

The invention discloses an energy dissipater for a wall vertical connecting seam. The energy dissipater comprises two lug plates and two actuating plates, wherein the lug plates and the actuating plates are horizontally arranged at the vertical connecting seam of two adjacent walls, the two lug plates are vertically arranged between the two actuating plates in parallel, one ends of the lug platesare fixedly connected with one of the walls, the other ends of the lug plates are connected with the middles of the actuating plates through fulcrum bolts correspondingly, one ends of the actuating plates are connected with the middles of the lug plates through energy consumption bolts correspondingly, and the other ends of the actuating plates are fixedly connected with the other one of the wallsthrough connecting bolts. According to the energy dissipater, the lug plates and the actuating plates are fixedly connected together through the energy dissipation bolts and the fulcrum bolts, effective transmission of horizontal force in the wall vertical connecting seam is achieved through the fulcrum bolts, meanwhile, the fulcrum bolts serve as rotation centers, the energy consumption bolts are bent and sheared to deform through rotation, effective transmission of vertical shearing force in the wall vertical connecting seam is achieved, force transmission ways are clear, an energy consumption principle is clear, and the anti-seismic effect is good.

The invention provides a valve with bellows seal which has reasonable structure and large expansion deformation amount. The valve comprises a valve body, a valve cap arranged on the valve body, a valve clack, a valve rod, a bellows and a driving mechanism, wherein the bellows comprises a plurality of dished ring plates; the dished ring plates are provided with dished ring plate through holes for the valve rod to penetrate through; the peripheries of outer edges of the dished ring plates are outer diameters; the peripheries of inner edges of the dished ring plates are inner diameters; outer diameter end surfaces and inner diameter end surfaces of the dished ring plates are located at different planes; the inner diameters are arranged at the same side of the outer diameter end surfaces; the outer diameters and the inner diameters of each dished ring plate are sequentially staggered and are fixedly connected in a sealing way; and the centers of circles of the inner diameters of the dished ring plates are arranged at the same straight line so as to form an integral bellows. When the bellows is stretched and deformed, positions of wave crests and wave troughs of the bellows basically do not become deformed, therefore, the deformation amount of the bellows is higher than that of the traditional bellows, the structure is more compact and reasonable, and the sealing effect is more obvious.

A highly pressurized liquid driven eccentric sheave type bottom hole sleeve cutter comprising an upper cylinder, spiral blades, a spiral blade mount shaft, a spiral blade limit seat, a plurality of balls, a lower cylinder sleeve, an automatic rebound mechanism upper pedestal, an upper limit seat, a lower limit seat, an upper cylinder outer sleeve, an upper cylinder inner sleeve, a lower cylinder outer slide column, an automatic rebound lower pedestal, a connecting pole, a spring centralizing barrel, a normally loose spring, a spring upper pedestal, a spring lower pedestal, a pin shaft, a crank connecting rod, a cutting tooth slideway, a cutting tooth pedestal, cutting teeth, and a detachable eccentric sheave 22; the highly pressurized liquid driven eccentric sheave type bottom hole sleeve cutter is simple in structure, low in cost, high in usage efficiency, easy to operate, saves materials, and is hard to be fatigued and damaged.

A sand-based flat membrane-bioreactor mainly comprises a bio-reaction cell, a membrane filter cell, a biological air-blowing flowmeter, a biological air-blowing pipe, a membrane air-blowing flowmeter, a membrane air-blowing pipe, an n-shaped circulating pipe, a sand-based flat membrane component, a suction pump, a partition wall, a purified water flowmeter, an air pump, a sand-based flat membraneelement, and a membrane bracket. Based on the well-known water permeable brick technology, the invention is prepared by the following steps: coating an organic membrane material to obtain a long-lifemembrane element - sand-based flat membrane element, forming a sand-based flat membrane component by the membrane element, and forming a sand-based flat membrane-bioreactor by the sand-based flat membrane component. The invention solves and overcomes the problems of a short service life due to the adoption of an organic membrane, and high cost, high running energy consumption and high running expense due to the adoption of an inorganic ceramic membrane for well-known membrane bioreactors. The membrane bioreactor becomes a technique for water treatment, sewage treatment, and sewage regeneration and recycle, which is more practical, and is suitable for popularization and large-scale utilization.

The invention belongs to the technical field of harmonic speed reducers and particularly relates to an overload protection type harmonic speed reducer. The overload protection type harmonic speed reducer comprises a wave generator, a flexible wheel and a steel wheel which are arranged coaxially. The front end of the flexible wheel is engaged with the steel wheel, an input shaft is connected to theinterior of a cam of the wave generator, a first end cover is installed on the side, corresponding to the wave generator, of the input shaft in a rotating mode through a first bearing, and a second end cover is installed on the part, corresponding to the side, away from the first end cover, of the wave generator, on the input shaft in a rotating mode through a second bearing. According to the overload protection type harmonic speed reducer, overload protection can be provided for the flexible wheel, the flexible wheel is not prone to fatigue damage, and the service life of the flexible wheelis effectively prolonged; cooling liquid can be used for carrying out heat exchange with heat generated in the working process of the resonance speed reducer, and the quick cooling effect can be achieved; and a lubricating agent can be forced to wriggle and is supplied in a set path, the purpose of reducing friction is achieved, the stability of the wheel-tooth friction performance of the flexiblewheel and the steel wheel is ensured, and the service life of a gear is prolonged.

The invention relates to an integrated crankshaft torsion damper assembly. The integrated crankshaft torsion damper assembly comprises a belt wheel and a hub connected with a crankshaft in a matched mode. The integrated crankshaft torsion damper assembly further comprises a damping rubber ring arranged between an inner circle of the belt wheel and an outer circle of the hub. The inner circle of the belt wheel is provided with a plurality of big inverted-trapezoid-shaped grooves of the same size at equal intervals. The outer circle of the damping rubber ring is provided with a plurality of biginverted-trapezoid-shaped bosses of the same size at equal intervals, and an inner circle of the damping rubber ring is provided with a plurality of small inverted-trapezoid-shaped grooves of the samesize at equal intervals. The outer circle of the hub is provided with a plurality of small inverted-trapezoid-shaped bosses of the same size at equal intervals. The multiple big inverted-trapezoid-shaped bosses of the outer circle of the damping rubber ring are matched with the multiple big inverted-trapezoid-shaped grooves in the inner circle of the belt wheel in a one-to-one correspondence modeand vulcanized into a whole. The multiple small inverted-trapezoid-shaped bosses of the outer circle of the hub are matched with the multiple small inverted-trapezoid-shaped grooves of the inner circle of the damping rubber ring in a one-to-one correspondence mode and vulcanized into a whole. The shear force borne by the damping rubber ring of the integrated crankshaft torsion damper assembly canbe changed into stress, the service life of the damping rubber ring is prolonged, and torsion vibration of the crankshaft is remarkably reduced.

The invention relates to a torsion damper assembly for a crankshaft. The torsion damper assembly for the crankshaft comprises a belt wheel, a wheel hub connected with the crankshaft in a matched modeand a damping rubber ring arranged between the inner circle of the belt wheel and the outer circle of the wheel hub. Multiple large grooves with the same size are formed in the inner circle of the belt wheel at equal distance. Multiple large bosses with the same size are arranged on the outer circle of the damping rubber ring at equal distance, and multiple small grooves with the same size are formed in the inner circle of the damping rubber ring at equal distance. Multiple small bosses with the same size are arranged on the outer circle of the wheel hub at equal distance. The large bosses arranged on the outer circle of the damping rubber ring correspond to the large grooves formed in the inner circle of the belt wheel one to one and are in interference fit with the large grooves formed in the inner circle of the belt wheel; and the small bosses arranged on the outer circle of the wheel hub correspond to the small grooves formed in the inner circle of the damping rubber ring and are in interference fit with the small grooves formed in the inner circle of the damping rubber ring. According to the torsion damper assembly for the crankshaft, the shear force borne by the damping rubber ring can be converted into the pressure, the service life of the damping rubber ring is prolonged, torsional vibration of the crankshaft is significantly reduced, and the reliability of an engine isimproved.

The invention discloses a friction energy consumption beam-column joint for a prefabricated structure. The friction energy consumption beam-column joint for the prefabricated structure comprises an additional friction energy consumption device which is located in an area where the beam-column joint is hinged. The additional friction energy consumption device comprises a slotting driving rod I, a slotting driving rod II, a driving rod I, a driving rod II and a pre-buried steel plate I, wherein the pre-buried steel plate I is located at the position where beam-column joint is hinged; and the two sides of the pre-buried steel plate I is hinged to one ends of the slotting driving rod I and the slotting driving rod II correspondingly, the other ends of the slotting driving rod I and the slotting driving rod II is hinged to one end of the driving rod I, the other end of the driving rod I is hinged to a column through two pre-buried steel plates II, and one end of the driving rod II is hinged to a beam through two pre-buried steel plates III. The friction energy consumption beam-column joint has energy consumption ability under the effect of big earthquakes, the additional friction energy consumption device consumes energy through slidable friction and rotary friction, the energy of the earthquakes is dissipated, and structure damage is reduced; when the friction energy consumption beam-column joint is used normally, the additional friction energy consumption device provides rigidity for the joint, internal force delivery is achieved, and the hinged joint can show similar performance with a rigid joint.

The invention discloses a press plunger device on a tunnel type washing machine. The device comprises a bottom part and a side part, wherein the bottom part is formed by sticking base glue (3) and a lining layer (4); the base glue (3) is a working surface; wear-resistant glue (1) is made from fatigue-resistant and wear-resistant rubber material with good elasticity; the base glue (3) is made from the rubber material resistant to bending crack, ozone aging and thermal oxidation aging; side glue (2) realizes a material characteristic transition effect between the wear-resistant glue (1) and the base glue (3), and is made from the rubber material resistant to oxidation, ozone and corrosion; arc transition (6) with the radius of 8-20mm is arranged at the junction of the side glue (2) and base glue (3); and the lining layer (4) is made from the rubber material with good water tightness, chemical stability and thermal stability. The press plunger device disclosed by the invention has good durability, water tightness, corrosion resistance and dehydration performance, does not easily cause drop of rubber particles in the dehydration process, and realizes a good washing effect.

This invention directs to a striking flake, especially a kind of striking flake which can be pressed to form electric contact point on the circuit plate and conduct current, outside the flake is equipped with a flat floor with a opposing part, using the flat floor to strengthen the stretching resistance around the striking flake and increase its service life; the opposing part is located in the two relative positions on the floor or four relative positions or three equal-pitch positions; the flake has several punch hole, being regular geometric shape or irregular geometric shape; in the center of the striking flake is located with contacting part being upward and downward bulging or notch shape.

The invention discloses a quick response type recoverable fuse. The quick response type recoverable fuse comprises an insulating shell and two wiring terminals fixedly installed on the insulating shell; a circuit changer, an insulating column and an iron core are fixedly arranged in the insulating shell; a first coil and a second coil are wound on the iron core in parallel; the second coil is electrically connected with the circuit changer; a sealing groove and a sliding groove which are communicated with each other are formed in the insulating column; a sealing ring is clamped at the joint ofthe sliding groove and the sealing groove; a floating plate is arranged in the sliding groove in a sliding mode; the upper end and the lower end of the floating plate are fixedly connected with a floating block and a balancing weight respectively; the floating block is located in the sealing groove; and a solenoid coil electrically connected with the circuit changer is fixedly installed on the upper portion of the insulating column. The fuse is high in response speed. Compared with a common fuse using a bimetallic strip as an on-off part, the temperature in the fuse will not be greatly increased, and fatigue damage is not likely to be generated.

The utility model relates to a multi-link vehicle reclining mechanism, which is used to solve the problem that the existing vehicle reclining mechanism cannot be used for a long time. The multi-link vehicle tilting return mechanism of the present invention includes a fixed shaft, a rotating member, a right connecting rod group and a left connecting rod group, the fixed shaft is fixed to the rear frame, and the rotating member is fixed to On the front frame, the rotating member is rotatably sleeved on one end of the fixed shaft, the right connecting rod group is connected to the rear frame and one side of the rotating member, and the left connecting rod group is connected to the rear vehicle frame and the other side of the rotating member.

The invention relates to a floor board tightly attached mounting method. The floor board tightly attached mounting method comprises the steps that a component is provided at the lap joint of a floor board and a platform steel beam and comprises a cross rod located above the floor board and vertical rods distributed and fixed along the cross rod; the bottom end of the vertical rod located at one end of the cross rod is perpendicularly fixed to the top face of the platform steel beam, and the other vertical rods are perpendicularly jacked at a concave position of the top face of the floor board in sequence; then all welded studs are sequentially fixed; and finally, the component is dismantled. By adoption of the floor board tightly attached mounting method, the position of the component does not need to be adjusted, aloft operation is facilitated, efficiency is high, and recyclability is achieved.

The invention belongs to the technical field of heat transfer, and provides a space double-vortex-tube elastic tube bundle heat exchanger. The heat exchanger utilizes vibration to achieve enhanced heat transfer, the tube bundle is made of red copper materials instead of traditional stainless steel materials, the flexible materials are not prone to damage, the service life is prolonged, and meanwhile the tube bundle vibration can achieve the effect of automatically removing scale. A plurality of groups of double-elbow pipes are adopted in the space double-vortex pipe, so that the flowing path of shell pass fluid is increased, the shell pass fluid fully absorbs heat, and the heat transfer effect is further improved; a mass block is adopted, so that fluid is easier to vibrate at a lower speed, and enhanced heat transfer is realized; pulsating flow generated by the pulsating flow generating device impacts the mass block, so that secondary flow is generated in the vortex tube, heat transfer enhancement is further achieved, and the vibration excitation and control over the space double-vortex-tube elastic tube bundle can be achieved; the combined installation of the heat exchanger can be achieved through flanges arranged on tube pass and shell pass inlets and outlets and connecting pipes, and the heat transfer effect is enhanced.

A low-cost piston ring manufacturing method is developed as a countermeasure against abrasion and breakage of the seam portion of the piston ring on which the coating is provided. The thickness of the coating (2) near the joint (7) of the piston ring (1) is thicker than the thickness of the coating (2) on the other outer peripheral surfaces. The raw material (5) of the piston ring rotates relative to the evaporation source (4), and when the seam (7) faces the evaporation source (4), the speed decreases.

A sand-based flat membrane-bioreactor mainly comprises a bio-reaction cell, a membrane filter cell, a biological air-blowing flowmeter, a biological air-blowing pipe, a membrane air-blowing flowmeter, a membrane air-blowing pipe, an n-shaped circulating pipe, a sand-based flat membrane component, a suction pump, a partition wall, a purified water flowmeter, an air pump, a sand-based flat membraneelement, and a membrane bracket. Based on the well-known water permeable brick technology, the invention is prepared by the following steps: coating an organic membrane material to obtain a long-lifemembrane element - sand-based flat membrane element, forming a sand-based flat membrane component by the membrane element, and forming a sand-based flat membrane-bioreactor by the sand-based flat membrane component. The invention solves and overcomes the problems of a short service life due to the adoption of an organic membrane, and high cost, high running energy consumption and high running expense due to the adoption of an inorganic ceramic membrane for well-known membrane bioreactors. The membrane bioreactor becomes a technique for water treatment, sewage treatment, and sewage regeneration and recycle, which is more practical, and is suitable for popularization and large-scale utilization.

The invention discloses a damping support, and relates to the technical field of bridge structure engineering. The damping support comprises a support body and a plurality of damping elements. The support body comprises a sliding plate and a piston. The sliding plate is slidably connected with the piston, and the damping element is connected with the sliding plate and the piston and can damp and dissipate energy when the sliding plate displaces relative to the piston. The multiple damping elements are distributed on the periphery of the piston, the number of the damping elements is an even number, and the damping elements are symmetrically arranged in pairs relative to the axis of the piston. The damping support has the advantage of being stable in work.

The invention relates to a bridge deck pavement structure based on the high-performance rubber concrete, which comprises a rubber cement concrete cast-in-place layer, an SBR modified emulsified asphalt waterproof layer and an asphalt concrete surface layer which are laid on a bridge deck from bottom to top, and a single-layer two-way reinforcing mesh is preset in a tension region of the rubber cement concrete cast-in-place layer. The bridge deck pavement structure has the beneficial effects that the bridge deck pavement structure has good anti-seepage and anti-cracking performance, proper strength and good economic and technical benefits, when the bridge deck pavement structure is applied to engineering, the deformation resistance and the driving comfort can be improved, a beam body is protected against the rain erosion frost heaving effect, the service life of the bridge deck pavement structure is prolonged, and the maintenance and later maintenance cost is reduced.

The invention belongs to the technical field of heat transfer, and provides a spiral baffling winding type copper pipe heat exchange device. According to the heat exchange device, the spiral structures of baffling plates are used for guiding flow of shell pass fluid in the heat exchange device, heat exchange fluid is in full contact with a heat exchange tube bundle, and the heat transfer performance of a heat exchanger is improved; the heat exchange tube bundle is excited to vibrate through fluid impact to achieve enhanced heat transfer, a copper tube is not prone to deformation, the service life can be prolonged, and the effect of automatically removing scale can be achieved while noise harm is reduced; by designing a brand-new structure, shell pass fluid is fully utilized to induce vibration to strengthen heat transfer, and the heat exchange device has the characteristic of large heat exchange area per unit volume; and in addition, through flanges and connecting pipes arranged at inlets and outlets, multi-permutation combined installation of a plurality of heat exchange devices can be achieved, and the heat exchange devices can be flexibly assembled and disassembled according to requirements of actual conditions.

The invention discloses a pump unit for lifting ore pulp in the sea, a combined structure and a mining lifting system, and belongs to the technical field of lifting equipment for mineral products in the sea. The pump unit for lifting the ore pulp in the sea comprises a first pump body and a second pump body. When high-pressure seawater is poured into a seawater cavity of the first pump body, the ore pulp in an ore pulp cavity of the first pump body can be discharged, seawater in a seawater cavity of the second pump body can be discharged, and the ore pulp can be sucked into an ore pulp cavity of the second pump body. When the high-pressure seawater is poured into the seawater cavity of the second pump body, the ore pulp in the ore pulp cavity of the second pump body can be discharged, the seawater in the seawater cavity of the first pump body can be discharged, and the ore pulp is sucked into the ore pulp cavity of the first pump body. The ore pulp can be continuously sucked into the pump unit and then discharged through continuous reciprocating circulation, and the purpose of lifting the ore pulp in the sea is achieved. The pump unit is large in displacement, long in service life, small in fluctuation, high in efficiency and high in economy and feasibility.