60results about How to "Reduced shear damage" patented technology

The invention relates to a shock insulation structure of a reinforced concrete beam column node and a construction method thereof. The shock insulation structure comprises a beam column node formed by an integrally poured reinforced concrete bearing column and a supporting beam. The supporting beam is fixedly connected with a reinforced concrete floor, and the joint of the floor and the bearing column is provided with a shock insulation material capable of preventing the floor and the bearing column from contacting each other. The shock insulation structure is simple in structure and good in damping effect.

The invention belongs to the field of coatings for architectural ornament, and particularly relates to an outdoor waterborne woodenware penetration paint and a preparation method thereof. The penetration paint is prepared from the following components by weight: 10 to 15 parts of water, 65 to 80 parts of waterborne emulsion, 2 to 5 parts of coalescing agent, 2 to 25 parts of coloring agent and 4.5to 9 parts of other aids. The outdoor waterborne woodenware penetration paint prepared by the method has good base material closing property, excellent weather fastness and water resistance on the basis of a traditional woodenware paint; in addition, the cracking of a substrate can be reduced and the substrate can be protected from being corroded to a certain extent.

The invention discloses a high-performance jute fiber reinforced polypropylene composite and a prepration method thereof. The high-performance jute fiber reinforced polypropylene composite comprises the following raw materials of, by weight, 20-60 parts of jute fibers, 30-80 parts of polypropylene, 1-10 parts of a compatilizer, 0.5-2 parts of a coupling agent, 0.1-1 part of antioxidants, and 0.2-1 part of lubricants. The polypropylene composite used for vehicles is prepared by adoption of the jute fibers which are low in price, rich in source, high in specific modulus, low in density and small in effect on the environment, the production cost can be lowered, and the composite accords with the development trend of low-weight, environment-friendly and recyclable automobiles; and meanwhile, the natural fibers are treated by adoption of an alkaline solution, the coupling agent and the compatilizer, the hygroscopicity of the jute fibers is reduced, and the bonding force between the jute fibers and polypropylene particles is increased at the same time.

The invention discloses a circular steel pipe concrete member constrained by a steel pipe and provided with an interlayer and a machining method thereof. The novel circular steel pipe concrete member constrained by the steel pipe and provided with the interlayer is composed of the outer steel pipe, an interlayer material and a core steel pipe concrete member, and the outer steel pipe and the interlayer material only provide lateral constraint for the core steel pipe concrete; both of the outer steel pipe and the core steel pipe concrete member are circular; and the outer steel pipe is arranged along full length of the surface of the core steel pipe concrete member and not connected with the end of the core member and a beam column joint. According to the circular steel pipe concrete member constrained by the steel pipe and provided with the interlayer and the machining method thereof, co-working performance of the core member steel pipe and core concrete can be strengthened, the bearing capacity and ductility of the member can be improved, the failure mode of the member can be improved, and the seismic resistance, corrosion resistance and fire resistance of the member can be reinforced; and according to the circular steel pipe concrete member constrained by the steel pipe and provided with the interlayer and the machining method thereof, the principle is clear, mechanical performance is excellent and engineering cost is low.

The invention relates to a woodenware paint and a preparation method, and especially relates to an outdoor aqueous woodenware matte clean finishing coat and its preparation method, which belong to the paint field for building decoration. The provided outdoor aqueous woodenware matte clean finishing coat comprises the following raw materials by weight: 10-14.6 parts of water, 0.1-0.15 parts of aqueous multifunctional auxiliary agent, 1-5 parts of aqueous flatting silica, 73-78 parts of aqueous pure acrylic acid emulsion, 4-5 parts of film forming auxiliary agent and 0.3-0.5 parts of aqueous levelling agent. The prepared outdoor aqueous woodenware matte clean finishing coat has excellent weatherability, can protect base materials from being destroyed; the usage is simple, the construction tolerance is wide and the application scope is wide.

The apparatus and method that best results in low shear to melt shear-sensitive materials, such as polyethylene terephthalate, polyvinylchloride, acrylonitrile butadiene styrene, acrylics and / or resins with fiber fillers, without sacrificing process speed and / or cycle time, comprises the use of a barrel, screw and induction heating coil. The screw, in this case, preferably includes a low volumetric compression ratio, a relatively short feed section, an extended transition section, and a typical metering section.

The invention relates to a composite geomembrane anti-seepage structure capable of automatically adapting to weir body deformation and a construction method, and aims to reduce a damaged condition at a joint of a composite geomembrane and a concrete toe board or at a lap joint of the composite geomembrane and a concrete cover cap on the top of a concrete anti-seepage wall. According to the technical scheme adopted by the invention, the anti-seepage structure comprises a concrete structure and a padding layer connected to the concrete structure, wherein the composite geomembrane with an anti-seepage structure is arranged between the concrete structure and the padding layer; the composite geomembrane comprises an upper protective layer PE film, a lower protective layer PE film, a U-shaped telescopic joint and an auxiliary horizontal telescopic joint, wherein the U-shaped telescopic joint is vertically arranged, the U-shaped opening of the U-shaped telescopic joint faces upwards; one end of the U-shaped telescopic joint is fixed into the concrete structure, and the other end of the U-shaped telescopic joint horizontally extends and is connected to one end of the auxiliary horizontal telescopic joint; the other end of the auxiliary horizontal telescopic joint is connected to other anti-seepage geomembranes of a weir body; one end of each of the upper protective layer PE film and the lower protective layer PE is bonded with the concrete structure, and the other ends of the upper protective layer PE film and the lower protective layer PE cover by complying with the shape of the telescopic joint to synchronously extend outwards.

A cross flow guide type stirring paddle applied to a fermentation tank belongs to the technical field of chemical machinery. The stirring paddle comprises a hub 3, a cambered surface inclined-blade paddle 2 and a cross flow guide pipe 1, wherein the hub 3 is a hollow cylinder, the cross section of the cambered surface inclined-blade paddle 2 is an arc bulged upwards, two to four blades of the cambered surface inclined-blade paddle are symmetrically distributed on the hub, and the cross flow guide pipe 1 is arranged at the tail end of the cambered surface inclined-blade paddle. The stirring paddle is mounted on a stirring shaft in the tank, is an axial flow stirring paddle and is applicable to the occasions like liquid-liquid blending, gas-liquid dispersion and forced heat transfer. The fluid in the fermentation tank moves axially under the action of the cambered surface inclined-blade paddle, meanwhile, part of the flow is guided to the rear upper part of the outer side of the blade, shocks on the wall of the tank and forms cross flow with the downward axial flow formed by the cambered surface inclined-blade paddle under the action of the cross flow guide pipe at the tail end of the stirring paddle, so that the fluid blending, gas-liquid dispersion and heat transfer are facilitated. The stirring paddle is relatively simple in blade structure, different specifications and sizes can be made according to the requirements, and the manufacturing cost is low.

The invention discloses an artificial-imitating dragon fruit picking device. The artificial-imitating dragon fruit picking device comprises a clamping mechanism, a sensing mechanism, a cutting mechanism and a controller, wherein the clamping mechanism comprises two clamping claws and a first drive device, touch sensors are arranged on concave arc clamping faces of the two clamping claws, end partsof the two clamping claws are rotationally arranged on the first drive device, and the first drive device is used for driving the two clamping claws to rotate oppositely or away from each other; thefirst drive device is vertically connected with a linear drive mechanism, a drive end of the linear drive mechanism is connected with the sensing mechanism, and the linear drive mechanism is used fordriving the sensing mechanism and the cutting mechanism to move away from the clamping mechanism. The artificial-imitating dragon fruit picking device can replace artificial work to pick the fruit with picking shears, picking is time-saving and labor-saving, and the automation level is high; dragon fruit blades can be found precisely and cut, and damage to the fruit in the picking process can be reduced; certain mesophyll can be cut according to picking requirements, and the dragon fruit is convenient to transport and store.

The invention relates to a novel partial pressure injection tool. The novel partial pressure injection tool is a depressurizing groove formed by coaxially sheathing a throttling core, an inner throttling ring pillar, an outer throttling ring pillar and an outer cylinder from inside to outside; the throttling core, the inner throttling ring pillar, and the outer throttling ring pillar are variable cross-section; the throttling core is formed by orderly connecting eight spindle shaped grooves with equal groove distance; the shape of the inner throttling ring pillar is the same as that of the outer throttling ring pillar; the inner throttling ring pillar and the outer throttling ring pillar are formed by orderly connecting eight spindle shaped ring grooves with equal groove distance; the spindle shaped grooves of the throttling core is corresponding to the spindle shaped ring grooves of the inner throttling ring pillar one by one, and the spindle ring grooves of the inner throttling ring pillar are corresponding to the spindle shaped ring grooves of the outer throttling ring pillar one by one; the longitudinal section of the spindle shaped ring grooves along the length direction is in the shape of spindle, and the longitudinal section of the spindle shaped grooves of the throttling core along the length direction is also in the shape of spindle; an annular gap between the inner throttling ring pillar and the throttling core is equal to the ring gap between the outer throttling ring pillar and the inner throttling ring pillar; the annular gap between the outer cylinder and the outer throttling ring pillar is slightly more than the annular gap. The novel partial pressure injection tool reduces the shear failure effect on ternary composite solution, and reduces the viscosity loss of flowing through the depressurizing groove.

A biocontainer film enhanced with an abrasion resistant or “cut-proof” substrate. Such substrates can be combined with current biocontainer materials, via various techniques of embedding, coextrusion or laminating, to maintain the cleanliness and low extractables already validated for biotech manufacturing. The substrate of choice may be constructed from materials known to be more resistant to abrasion and sharp razor type cuts or from materials oriented in such a way to prevent puncture to occur. The new substrate must also be flexible to allow for typical folding as demonstrated by current packaging practices. The new substrate may be constructed from materials other than polymers such as metal, glass or carbon or in combination with polymers. A non-constrained pressure test is also disclosed.

The invention discloses a measurement method and device for the properties of a gel plugging agent in reservoirs. The measurement device comprises a pore throat simulator, wherein the pore throat simulator at least comprises a section of first pipe cavity and a section of second pipe cavity, and a diameter shrinkage part is formed in the connected position of the two pipe cavities. According to the measurement method, a relation curve of pressure and the volume deformation amount of a gel sample is obtained by means of the measurement device; gel elasticity is evaluated according to a linear section of the curve, and a pressure peak represents the plugging strength of the gel to a pore throat; a relation curve of pressure gradient and flow is measured in the second pipe cavity of the device, and the gel viscosity of weak gel is determined. According to the measurement method and device for the properties of the gel plugging agent in the reservoirs, the operation is simple and convenient, the testing time is short, the accuracy is high, the repeatability is good, a series of gel systems with different properties can be quantitatively measured under the same standard, and the analogy is high; and further, the problem of different measurement devices and evaluation standards for quantitatively measuring gel with different properties in the conventional gel testing is solved fundamentally.

The invention discloses a prefabricated hollow interlayer concrete-filled steel tube member and a preparation method thereof. The prefabricated hollow interlayer concrete-filled steel tube member comprises an inner steel tube and an outer steel tube which are concentrically arranged, concrete is poured between the inner steel tube and the outer steel tube, a plurality of angle steel ribbed stiffeners which are evenly distributed around the axis on the external wall of the inner steel tube, the angle steel ribbed stiffeners are surrounded by a reinforcing mesh which is arranged in concentricitywith the inner steel tube, a sleeve which is not connected to the ends of the outer steel tube and beam-column joints is arranged along the length of the surface on the outside of the outer steel tube, and a prestressed ferrule is arranged at the end of the sleeve. According to the invention, because the bending rigidity of the prefabricated hollow interlayer concrete-filled steel tube member ishigh under the condition of the same weight after the section is spread, under the condition of high bending moment, the mechanical properties of the material can be better exerted, the bearing capability is high, the prefabricated hollow interlayer concrete-filled steel tube member has good plasticity, toughness and fire resistance, the speed of construction can be increased, the period of construction can be shortened, and economic benefit can be increasedimproved.

The invention provides a novel high-strength anchorage device which comprises an anchorage cup, prestressed steel wires and a wire separation board. The novel high-strength anchorage device is characterized in that the wire separation board is arranged in the anchorage cup, and the prestressed steel wires penetrate through the anchorage cup and the wire separation board and are fixed to the end face of the wire separation board. The taper of a first taper hole of the anchorage cup is between 0.1 and 0.2, the taper of a second taper hole is between 0.2 and 0.3, the second taper hole adopts thetaper larger than that of the first taper hole, more stress of the wire separation board is converted into axial stress, axial force bearing is further facilitated, the stress stability of the anchorage device is improved, and deformation of the anchorage cup is reduced. The taper of the outer surface of a wire separation board body is identical to that of the large taper hole of the anchorage cup, the ratio of the radius of curvature of a groove to the radius of the wire separation board body is 1:1, the stress on the wire separation board is even, steel wire holes point at the peak of the first taper hole of the anchorage cup, and shearing damage of the wire separation board to the steel wires is reduced. The strength of the anchorage device is improved, the service life of the anchoragedevice is prolonged, practicability is high, popularization is easy, and economic benefits are good.

The invention discloses a fluidized-bed cell-culture disposable film device filled with sheet-shaped carriers. The fluidized-bed cell-culture disposable film device comprises a closed bag body, wherein the closed bag body is internally filled with the plurality of sheet-shaped carriers; the two sides of the outer part of the closed bag body are respectively provided with an extending edge seal; the closed bag body is fixed in a biological cell-culture shaking bed by fixing mechanisms on the extending edge seals at the two sides; the top surface of the closed bag body is provided with an upperair inlet, an air outlet, a sampling hole and at least one liquid inlet and liquid outlet; a lower air inlet is formed in the bottom surface of the closed bag body; the upper air inlet, the air outlet, the sampling hole, the liquid inlet, the liquid outlet and the lower air inlet are respectively connected with an aseptic quick joint; each liquid outlet is also internally provided with a partitioning device; the sheet-shaped carriers are intercepted in the closed bag body by the partitioning devices arranged at the liquid outlets to realize separation of cells from the sheet-shaped carriers. The fluidized-bed cell-culture disposable film device disclosed by the invention has the advantages of excellent oxygen-dissolving effect, large final density of cell culture and convenience in industrial amplification of wall-attaching cells and the like.

This invention discloses a photo bioreactor, which is a small-scale photo bioreactor with such advantages as simple production, low cost and high microalgae culture efficiency. A transparent bioreactor is mounted on a base. The air vent at the upper part of the transparent bioreactor is sealed, and equipped with an air pipe. The air pipe is connected with air filter, three-way regulative valve and air compressor in sequence. An exhaust mouth is set at the side of the transparent bioreactor, which is sealed and equipped with an air pipe. A bacteria-filtration membrane or filter medium is set at the bottom end of the air pipe. Multiple light sources surround the transparent bioreactor on the base. The photo bioreactor realizes the preparation of compressed sterile air by using the air compressor and the filter, and the adjustment of the sterile air flux into the reactor by using the three-way regulative valve. The photo bioreactor can thus realize the adjustment of dissolved CO2 concentration in microalgae culture system and the stirring degree, and ensure uniform nutrition distribution in the system. The photo bioreactor has such advantages as simple production.

The invention belongs to the technical field of rock-soil anchoring, and relates to a prestressed expanded-head anti-floating anchor rod and a construction method.The variable-diameter reinforcement cage is installed on the anchoring section of an anchor rod body, the outer side of the free section of the anchor rod body is sleeved with an anti-corrosion lantern ring, an anchor rod centering device is arranged on the free section of the anchor rod body, and the upper portion of the anchor rod body is sleeved with a second steel sleeve; the bottom of the second steel sleeve is connected with the top of the anti-corrosion lantern ring, and the top of the second steel sleeve is aligned with the bottom face of the anchor pit in parallel and connected with a stress diffusion anchor disc which is fixed through a fastening nut. The anchor rod impermeable layer is arranged between the building foundation bottom plate and the foundation waterproof layer, and the grouting pipe is arranged on one side of the anchor rod body; when the variable-diameter reinforcement cage is unfolded, the contact area of the anchor rod body and an anchoring body can be increased, bonding of the anchor rod body and the anchoring body is enhanced, the uplift bearing capacity of the anchor rod is improved, cracking of anchoring section concrete is effectively controlled, and the integrity of the anchor rod is enhanced. The variable-diameter reinforcement cage is opened by means of grouting pressure and the gravity of the device, and construction is simple and fast.

The invention discloses a low-odor and high-performance plant fiber reinforced regenerated polypropylene composite material and a preparation method thereof. The low-odor and high-performance plant fiber reinforced regenerated polypropylene composite material comprises the following raw materials in parts by weight: 34.5-69.5 parts of polypropylene regenerated material; 20 to 50 parts of plant fiber; 5-10 parts of an elastomer; 0-5 parts of odor improving master batch; 1-3 parts of a compatilizer; 0.5 to 2 parts of a coupling agent; 0-1 part of an antioxidant; 0-3 parts of other auxiliary agents; the method has the advantages that the odor improving master batch used in the method combines physical adsorption and chemical odor removal, namely, the characteristic of high specific surface area of activated carbon can quickly and effectively adsorb odor molecules, and meanwhile, nano titanium dioxide can effectively decompose small organic molecules emitted by a material system under the catalytic action of visible light, so that the odor improving master batch can be used for improving the odor. And the activated carbon and the porous activated carbon with a physical adsorption function play a synergistic effect to jointly improve the odor emission performance of a material system.

The invention relates to the field of antistatic flame-retardant master batch processing, in particular to an antistatic flame-retardant master batch and a preparation method thereof. The antistatic flame-retardant master batch mainly comprises the following components in parts by mass: 20-50 parts of linear low density polyethylene (LLDPE), 2-10 parts of ethylene vinyl acetate (EVA), 1-8 parts ofpolyolefin elastomer (POE), 5-12 parts of conductive carbon black, 1-6 parts of coated red phosphorus, 0.1-4 parts of a processing aid and 2-10 parts of a compatilizer. The formula does not contain polyethylene wax or low-molecular dispersants, a conventional repeated batch-type internal mixing feeding mode is changed, and feeding frequency is reduced, so that the problem of bearing performance defects of the downstream products caused by too much additives is solved, stability of product quality is improved, and comprehensive cost is reduced. Through the arrangement of double-shaft mixing rotary shafts and through a multi-section sectional design, the edges of the mixing stirring paddles on a mixing section are of a two-edge structure, materials are uniformly mixed through the mixing section in a movement process, is subjected to exhausting, and then are sent into the extrusion granulating machine for molding, and the materials do not need to be pressed after mixing in the mixing section, so that the shear damage force to a carbon black structure in the mixing process is reduced.

The invention discloses a bioreactor, a stirring paddle thereof and a method for cultivating TIL cells through the bioreactor. The stirring paddle is wrapped by a material for reducing shear force. The bioreactor comprises the stirring paddle wrapped by the material for reducing shear force, and TIL cells are cultivated through the bioreactor. As TIL cells are cultivated through the bioreactor, and the stirring paddle is wrapped by the material capable of reducing shear force, damage of shear force to cells can be reduced, and mass amplification of cells is facilitated. In the cultivating process, stirring continues, a dynamic system is provided, cells can conduct gas exchanging, the even cultivating environment can be provided for cells, and mass amplification of cells is facilitated. By means of the method, mass amplification of TIL cells can be conducted, the expression quantity of surface antigens of obtained TIL cells is high, and tumor cell killing activity is high.

The invention relates to an initial mixing device for PVC metallized heat shrinkable film material. The mixing device includes an upper hopper, a lower hopper, a support frame, a hopper rotating mechanism and a spiral body, the spiral body is connected between the upper hopper and the lower hopper, and the spiral cavity is provided in the spiral body, The spiral chamber is provided with a spiral element, the silo rotating mechanism is set on a support frame, and the silo rotating mechanism is provided with connecting shafts fixed on the upper silo and the lower silo respectively. The invention has the advantages of simple structure, uniform mixing, no power mixing, reduced shear damage of metal powder and good dispersion effect of metal powder.

The invention provides a cell centrifuging device and a cell centrifuging, cleaning and culturing method. The cell centrifuging device comprises a centrifugal cup and one or more liquid pushing plates, wherein the centrifugal cup is provided with a rotation axis and is used for being connected with a rotation driving mechanism and rotating around the rotation axis under the driving of the rotation driving mechanism so as to be used for centrifuging a blood sample contained in the centrifugal cup; the one or more liquid pushing plates are arranged in the centrifugal cup; and under the condition that the centrifugal cup rotates, the liquid pushing plates are used for pushing the blood sample to synchronously rotate in the rotating direction which is the same as the rotating direction of the centrifugal cup. According to the cell centrifuging device and the cell centrifuging, cleaning and culturing method provided by the invention, the liquid pushing plates are arranged in the centrifugal cup, and the blood sample in the centrifugal cup rotates synchronously with the centrifugal cup under the pushing action of the liquid pushing plates in the centrifugal cup process, so that cells in the blood sample are prevented from being sheared in the centrifugal process, and shear damage to the cells in the centrifugal process is reduced.

The invention discloses a shaking reactor, which comprises a tank body, a shaking device, a reaction bag and a control device, wherein the tank body is connected onto the shaking device; the shaking device can drive the tank body to do annular rail type movement; the reaction bag is provided with a reaction cavity; the reaction bag is arranged in the tank body and is provided with a feeding opening, an inoculation opening, a material supplementing opening, an air inlet opening and an air outlet opening which communicate with the reaction cavity; the air inlet opening is positioned in the top of the reaction bag; the control device is electrically connected with the shaking device. The shaking reactor has the advantages that the shearing force damage can be avoided during the cell culture;the amplification culture process is simple.

The invention provides a high-stability electric surfboard. The high-stability electric surfboard comprises a surfing base board, a power source component, a drive component and a steering control component. The drive component comprises a drive circuit template, a drive motor and fan blades. A power source installation cavity is formed in the middle portion of the upper layer of the surfing baseboard, and a drive installation cavity is formed in the tail portion of the upper layer of the surfing base board. The power source component is installed in the power source installation cavity, andthe drive circuit template is installed in the drive installation cavity. The fan blades are installed on a rotary shaft of the drive motor, and the fan blades and the drive motor are installed on thetail portion of the lower layer of the surfing base board, so that the front end of the surfing base board is lifted up, the tail portion of the surfing base board inclines downwards, the gravity center of the whole surfing base board deviates to the rear portion horizontally, the fan blades can drive a water stream to be obliquely sprayed out downwards, the surfboard stably moves forwards at a low speed, use stability is improved, losses are reduced, and a surfing effect is guaranteed. The surfboard is matched with the structure that the outer wall faces of sealing layers are flush with thefour side walls of a power source cover body and the four side walls of a drive cover body, water is prevented from flowing into the cavities, and normal use of the electric surfboard is guaranteed.

A centrifugal lifting stirrer of a bioreactor is disclosed. The centrifugal lifting stirrer includes a tank body having an opened top. A gear ring is fixedly mounted to the inner wall of the bottom end of the tank body. A drive gear provided with a motor is movably mounted at the middle of the inner wall of the bottom end of the tank body. The drive gear and the gear ring are arranged concentrically. The inner wall of the bottom end of the tank body is provided with an annular slot. The annular slot and the gear ring are concentric. The diameter of the annular slot is smaller than the diameterof the gear ring. A plurality of sliding blocks are disposed in the annular slot in a matched manner and are evenly distributed according to the circle center of the annular slot. A horizontal drivengear is movably mounted to the top end of each sliding block and is between the gear ring and the drive gear. The driven gears can be meshed with the drive gear and the gear ring. A vertical long boxhaving an opened top is fixedly mounted at the top surface of each driven gear, and an accommodating box having an opened top is fixedly mounted to the inner wall of the bottom end of each long box.Connecting pipes are made of stainless steel. Positions of rotary valves of the connecting pipes can be fixed so that match gears can be meshed with racks, and opening or closing of the rotary valvescan be controlled.

The invention discloses an ultrahigh-strength shattering and bullet protecting layer which sequentially comprises an ultrahigh-strength steel layer (1), a common steel layer (2) and a concrete layer (3) from top to bottom, all the layers are detachably and fixedly connected into an integral composite structure through ultrahigh-strength device assembly connecting pieces, and meanwhile disassembly and replacement are convenient. The ultrahigh-strength alloy steel which is high in strength, good in fracture toughness, high in impact load resistance and low in cost is adopted as a first-layer material; different safety levels can be achieved by adopting different thickness matching schemes for all the layers, and typical earth-penetrating bullets with different equivalent weights, especially earth-penetrating weapons with large equivalent depths, can be impacted and broken. According to the composite structure, an ultrahigh-strength material is adopted, so that the earth-penetrating bomb is impacted and broken, and the protection capacity is improved; meanwhile, the structure is simple, manufacturing is easy, the application range is wide, and prefabricated components are convenient to construct, and can be applied to bullet shielding layers of military engineering and civil air defense engineering.

The invention discloses a car crash active safety headrest device with a force release mechanism. The car crash active safety headrest device comprises a seat backrest and a headset framework above the seat backrest, wherein supporting blocking plates are symmetrically arranged on side plates at the two sides of the seat backrest; jacks are formed in the supporting blocking plates; two ends of a U-shaped trigger rod which is horizontally arranged in the middle of the seat backrest are movably inserted into the jacks; return springs are respectively arranged at the two ends of the U-shaped trigger rod; the other ends of the return springs are connected with a backrest side plate; a linkage plate which upwards extends is hinged to the middle of the U-shaped trigger rod; a headrest bracket is fixedly connected at the upper end of the linkage plate; the headrest bracket is horizontally placed on a tube rack on the upper part of the seat backrest; guide sleeves are arranged on the headrest bracket in a spaced manner; the connecting rod of the headrest framework is fixedly inserted into the guide sleeves; a damping hinge is connected in the headrest bracket between the two guide sleeves; a rotary end of the damping hinge backwards extends to a position above the tube rack. The car crash active safety headrest device has the advantages of being simple in structure, light, safe and stable and low in production maintenance cost.

The invention relates to the technical field of steering knuckles, and in particular relates to a method for improving the elongation and the shrinkage of a rod part of a steering knuckle. The methodcomprises the steps of heating round steel, upsetting, extruding, pre-forging and finish-forging to obtain a forging blank, and during pre-forging, arranging a transition arc at the joint of the rod part and a disc part of the steering knuckle, and the transition arc forming an annular face around the axis of the rod part. The radius of the transition arc on the side, close to a steering knuckle long lug, of the annular face is R1, R1 is a fixed value, the radius of the transition arc on the side, close to a steering knuckle short lug, of the annular face is R2, the plane where the axis of therod part of the steering knuckle and the axis of a main pin hole are located serves as a datum plane, and R2 is evenly reduced to R1 along with the angle deviating from the datum plane. According tothe method, rod part mold filling can be facilitated, shear damage of an internal metal flow line in the forming process of the rod part of the steering knuckle is reduced, and reduction of the mechanical performance of the rod part is avoided; the rod part can be uniformly distributed, and two sides of the flow line are uniformly and symmetrically distributed; and the stress distribution at the joint of the rod part and the disc part of the steering knuckle is improved.