30results about How to "Overcome shock" patented technology

The invention discloses capsule production line equipment, which comprises a slab overturning mechanism, a circulating capsule drying device and a slab lifting mechanism, wherein the lifting mechanism drives the slab to overturn stably, the service lives of a gear and a rack are long, no compact or noise is generated during an overturning process, the lifting mechanism does not need to stop to wait for a slab to be pushed into a clamping groove, the slab enters the clamping groove automatically, the slab conveying time is saved, the continuity of a production line is better, and the processing efficiency of the capsule production line is improved; the defect that the slab can only be pushed in when a slab lifting device descends to the lowest position is overcome by the slab lifting mechanism, at least two slabs can be lifted at a time, and the work efficiency of the capsule production line is greatly improved; the occupied space of the circulating capsule drying device is smaller, the utilization rate is high, lead screws at each layer move synchronously, and slab pushing mechanisms at multiple layers can be driven by one motor, so that resources are saved, and the synchronism of each slab pushing mechanism is ensured.

The invention relates to a horizontal luffing grab portal crane, including a four-bar linkage level luffing boom system, a travelling mechanism and a gantry structure. The crane is characterized in that: a luffing mechanism comprises a triple screw, a screw pedestal and an electric transmission mechanism. The outside of the triple screw is provided with a telescopic cover, the inside of the screw pedestal is equipped with a sleeve with nuts, and two ends outside the sleeve are provided with bearings in the screw pedestal. The electric transmission mechanism comprises a motor, a driving gear and a brake apparatus. The end of the triple screw is hinged to a boom, and the luffing mechanism is equipped with a speed adjustable control system. The four-bar linkage boom system and a gantry beam are both girder construction which employs a T-shaped structure and a rectangular pipe. The T-shaped structure is a main chord member, and the rectangular pipe as a web member is welded on a web member gusset plate. In the blanking process, the T-shaped structure and the web member gusset plate are integrated through numerical control cutting. The crane of the invention has high operating cycle frequency which can reach 6 million times, high luffing speed, smooth running of grab bucket, high operating efficiency and long service life.

The invention relates to the technical field of preparation and repair of sliding bearing Babbitt metal anti-friction layers. The novel cold spraying technology is introduced into manufacturing and repair remanufacturing of a Babbitt metal sliding bearing bush lining anti-friction layer, atomization powder feeding is adopted to obtain coating microstructures with uniform components and fine dispersely-distributed and uniformly-dense crystal grains and second phases through cold spraying, and the good interface bonding characteristic is obtained through tinning layer setting and sprayed thermal treatment; the defects of poor structure uniformity, thermal impact, stress, cracking and oxidizing burning losses existing in the technologies such as a traditional casting method, an overlaying method and a thermal spraying method are overcome, the bearing bush component preparation quality and level are improved, the bush burning frequency is decreased, stopping supercritical vibration is lowered, the stability, accuracy and reliability of a bearing transmission unit are improved, and the service life of the bearing transmission unit is prolonged; the method is rapid, efficient and environmentally friendly, is used for bearing bush manufacturing and repair remanufacturing, and has good economic benefits and social benefits.

The invention relates to a linear motion actuator combined by the fluid drive and the lead screw nut device, which comprises a fluid drive cylinder, a lead screw nut mechanism, a motor, a speed reducer, an electromagnetic brake and a photoelectric sensor. Therefore, a linear motion execution and control unit integrating the fluid, optics, machinery and electronic functions is formed, which can conveniently realize the speed and position control of the linear motion of the high comprehensive index precision.

The invention provides a preparation method of a thermal barrier coating on the surface of an aluminum-magnesium alloy and a composite material of the alloy. The preparation method is characterized in that the thermal barrier coating on the surface of the aluminum-magnesium alloy and the composite material of the alloy is prepared by carrying out electrolytic oxidation on the surface of the aluminum-magnesium alloy and the composite material of the alloy with a silicatic and phosphatic system plasma electrolyte to form a film medium, and carrying out electrophoretic deposition on the plasma electrolytic oxidation film (the film medium) with an electrophoretic deposition electrolyte. A plasma electrolytic oxidation-electrophoresis composite ceramic layer obtained with the preparation method of the invention, which has the advantages of smooth surface, firm combination, controllable thickness, densification and less aperture, good thermal insulation and thermal shock resistance, is suitable for workpieces with various dimensions and surfaces of complicated shapes.

The invention provides a preparation method of modified biochar, the modified biochar, a composite material and a soil repairing agent, and relates to the technical field of biochar. The preparation method of the biochar comprises the following steps: mixing peanut shell powder with a graphene oxide suspension to obtain peanut shell powder impregnated with the graphene oxide suspension; mixing theobtained peanut shell powder impregnated with the graphene oxide suspension with the nano-SiO2 to obtain a mixed material; mixing the obtained mixed material with water to obtain a mixture; carbonizing the mixture to obtain hydrated carbon, and drying the obtained hydrated carbon to obtain the modified biochar. The modified biochar provided by the invention has porosity, large specific surface area and good adsorption capacity, and can effectively reduce the activity of soil heavy metals in the soil.

A method for stable platform bi-direct current torque motor micro-elementary error to eliminate the backlash, belongs to the high accuracy servo control method. The method uses the bi-direct current torque motor to drive the stable platform transmission gear, and the controlling quantity of the controller of the stable platform respectively controls the two direct current torque motors through two servo amplifiers after respectively stacking the positive negative differential quantity, when the controlling quantity absolute value of the stable platform controller is larger than or equal to the differential control absolute value, two motors drive the transmission gear simultaneously; when the controlling quantity absolute value of the stable platform controller is smaller than the differential control absolute value, the two motors form to the back drive transmission gear, wherein the motor having the larger absolute value plays the leading effects when driving the transmission gear to rotate, and the direct current torque motor having the smaller controlling quantity absolute value drives backwards to make the transmission shaft transmission gear of the two motors respectively mesh with the positive and negative directions of the transmission gear, which eliminates the effect of the transmission backlash, thereby realizing to continuously drive the transmission gear when the stable platform diverts, reaching the aim of advancing the positioning accuracy of the stable platform.

The invention relates to an impact testing device for a parachute landing unmanned aerial vehicle damper and a method thereof. The impact testing device comprises a displacement sensor, an electric discharging loop, an electric discharging coil, an induction coil, a conical driving head, a guiding shaft and a pressure sensor. The electric discharging loop performs instantaneous electric discharging on the electric discharging coil. Strong pulse current is generated in the discharging coil and furthermore an alternated high-strength magnetic field is formed at the periphery of the discharging coil. The induction coil closely abuts against the electric discharging coil. Because electromagnetic induction generates strong eddy current, the directions of the magnetic fields generated by the electric discharging coil and the induction coil are opposite, thereby generating an electromagnetic repulsion force, namely an electromagnetic impact force. The electromagnetic impact force performs impact loading on a to-be-tested damper through the conical driving head and the guiding shaft. Impact force data are acquired through a pressure sensor. Compression amount of the damper is acquired through the displacement sensor. The impact testing device and the method have advantages of accurate controllable impact force, high stability, simple operation and small land occupation. The impact testing device and the method thereof overcome defects of large land occupation, tedious operation and limited impact energy in a landing vibration testing platform for damper impact testing.

The invention provides a multifunctional agricultural soil remediation bacterium agent as well as a preparation method and application thereof, and relates to a bacterium agent as well as a preparation method and application thereof, aiming at solving the problems of an existing microorganism degradation method of DBP (Dibutyl Phthalate) that microorganisms are easily influenced by soil environment factors including indigenous microorganism competition, soil temperature and the like, relatively high bioactivity is difficult to keep and the function is relatively single. The bacterium agent isprepared from a microorganism bacterium agent A and a DBP degradation bacterium fermentation solution, wherein the microorganism bacterium agent A is prepared from a sphingobium fermentation solution,a bacillus mucilaginosus fermentation solution and a klebsiella oxytoca fermentation solution. The method comprises the following steps: preparing the microorganism bacterium agent A; preparing the DBP degradation bacterium fermentation solution; mixing the DBP degradation bacterium fermentation solution with the microorganism bacterium agent A to obtain the multifunctional agricultural soil remediation bacterium agent. The bacterium agent provided by the invention can keep relatively high biological remediation activity in a soil environment for a long term, and the remediation efficiency ofDBP pollution is effectively improved; when DBP polluted soil is repaired, the fertility of the polluted soil also can be improved. The multifunctional agricultural soil remediation bacterium agent is used for the field of soil remediation.

A novel direct-inserting type balcony wall-mounted solar water heater is an advanced solar water heater. The idea for design is that an efficient vacuum heat collection pipe is directly inserted and combined with a pressure-bearing thermal insulation water tank, and a heat-conducting working medium pipeline is eliminated, so that direct absorption and conduction of heat are facilitated. The novel direct-inserting type balcony wall-mounted solar water heater is composed of the pressure-bearing water tank, a heat collecting pipe and a heat collecting pipe rack and is compact in structure, reasonable in design, capable of being integrated with buildings, free of limitation from high-rise buildings, capable of operating with pressure borne and feeding water automatically and high in automation degree. The using of heat-conducting working media and addition of an anti-falling mesh solve the problem that the heat collecting pipe is easy to explode. The heat collecting pipe is reasonably integrated with the buildings by means of the rational design of the heat collecting pipe rack, temperature of a water inlet pipe and water outlet pipe bunch is preserved, and an outdoor pipeline is extremely short so that the problem that the outdoor pipeline is frozen and cannot operate can be solved, Further, an electric-heating server is assembled, so that the solar water heater can operate in all weather without any limitation from seasons. The pressure-bearing water tank is hung outdoors so that indoor space is saved.

The invention discloses a combined incompletely eccentrically circular and non-circular gear planetary train vegetable seedling pick-up mechanism. An existing pick-up mechanism gains a wide-range variation in a transmission ratio of a pick-up trajectory through a locking arc and has high transmission impact. In the mechanism, a center shaft and a planet carrier are fixed; a central incompletely eccentrically circular gear is fixed to a frame, a central incompletely non-circular gear is fixed to the central incompletely eccentrically circular gear, and both the two gears loosely sleeve the center shaft; a first middle non-circular gear is connected with a first middle shaft through splines, and a first middle incompletely non-circular gear is fixed to a first middle non-circular gear; a second middle non-circular gear is connected with a second middle shaft through splines, and a second middle incompletely non-circular gear is fixed to the second middle non-circular gear; a first planet non-circular gear is connected with a first planet shaft through splines, and a second planet non-circular gear is connected with a second planet shaft through splines; both one end of a first planet shaft and one end of the second planet shaft are fixed to a shell of a pick-up claw. This mechanism has stable transmission and low impact.

The invention relates to a dynamic slideway capable of straight line motion with an electric and pneumatic composite transmission function. The invention comprises two air cylinders, a screw rod nut driving mechanism, an electromotor, a reducer, an electromagnetic controller and a photoelectric sensor to form a straight line motion driving and controlling unit integrating the factors of liquid, mechanics, electron and optics; the invention can easily achieve the straight line motion speed and the position control with a high comprehensive index.

The invention provides a diesel engine vibration impact source identification method based on multi-measuring-point information fusion. The method is based on a diesel engine online monitoring system.The vibration impact energy of a cylinder cover vibration signal is calculated and acquired. Uniform segmentation is performed for obtaining an impact energy maximal value matrix. A vibration impactenergy dimensionless matrix is defined and established. Furthermore a set structure is plotted for obtaining a distance matrix between two cylinders in all cylinders. An impact source determining condition is made based on the distance matrix. The impact source is identified according to the energy and a distance matrix characteristic. According to the method, fusion analysis is performed on multiple measuring point signals according to a vibration transmission attenuation rule. Through actual examination, vibration impact source identification and fault monitoring diagnosis of a four-stroke or a two-stroke diesel engine can be quickly and accurately realized. The method can be used for performing functions of performing source identification on the impacts from the same vibration source in different measuring point signals in normal operation, performing real-time monitoring on the operation health state of an actual set, and performing quick positioning diagnosis on the abnormal impact caused by a fault.

The invention discloses a wall-flow honeycomb ceramic filter for high-temperature exhaust gas purification, which comprises a basic material and a pore creating material; the basic material comprises 55-85 wt% of cordierite, 10-30 wt% of aluminum titanate, 2-8 wt% of Suzhou clay and 2.4-7.5 wt% of alumina; and the usage of the pore creating material is 1-3 wt% of that of the basic material. In addition, the invention further discloses a method for preparing the ceramic filter. The ceramic filter has the characteristics of thermal shock resistance, high strength, high porosity and the like, has excellent performance, and can meet the technical requirements of purification of high-temperature dust-laden exhaust gas; and furthermore, the preparation process is stable and reliable and easy to control, thereby facilitating the popularization and the application.

The invention discloses a novel sliding block type bidirectional overrunning clutch. The novel sliding block type bi-directional overrunning clutch comprises an outer ring and sliding blocks. An inner ring support and a driving shifting fork are arranged inside the outer ring and fixed through check rings, close to the two ends, inside the outer ring. The inner ring support is provided with semi-circular groove rolling channels. The working face of each sliding block is arranged in the corresponding semi-circular groove rolling channel and is in contact with the corresponding semi-circular groove rolling channel. Each pair of semi-circular groove rolling channels and the pairs of sliding blocks are configured in opposite directions. The sliding blocks are in series connection through a spring to form an annular shape, and the sliding blocks are arranged in an annular space between an outer ring inner hole rolling channel and the inner ring support. The driving shifting fork is provided with shifting fork protruding claws. Each shifting fork protruding claw is inserted into a space between the corresponding sliding blocks which are arranged in opposite directions. The clutch has the beneficial effects of being reliable in bidirectional self-locking, precise in positioning and stable in operation; no impact or noise is generated in the releasing process; and the clutch is high in transmission efficiency and long in service life. In mechanical transmission, the clutch can be used for preventing reverse rotation bidirectionally; bidirectional rotation of a driving end can drive bidirectional rotation of a driven end; and the purpose of precise positioning or torque transmission or overrunning is achieved.

The invention discloses a variable-bar-diameter Hopkinson pressure bar experimental device and a variable-bar-diameter Hopkinson pressure bar experimental method. The variable-bar-diameter Hopkinson pressure bar experimental device comprises a three-jaw chuck, a transmitting system, an experimental bar system and a data acquisition and processing system, wherein the launching system is composed ofan air pump, an air cylinder and a gun barrel; the experimental bar system is composed of an impact bar, an incident bar, a transmission bar and an absorption bar; the incident bar, the transmissionbar and the bar are sequentially centered and clamped by means of the three-jaw chuck; the three-jaw chuck is composed of a baffle plate, a pedestal, a pneumatic chuck body, radial moving pawls, rollers, a pneumatic adjusting air inlet and a manual adjusting valve; the pneumatic chuck is connected with the air pump by means of the pneumatic adjusting air inlet; the clamping end of each radial moving pawl is connected with the corresponding roller, and the incident bar, he transmission bar and the absorption bar can slide on the rollers; and a test sample is arranged between the incident bar and the transmission bar, an incident bar strain gauge is arranged on the incident bar, a transmission bar strain gauge is arranged on the transmission bar, and the incident bar strain gauge and the transmission bar strain gauge are both connected with the data acquisition and processing system.

The invention discloses a polyester modified hydroxyl acrylic resin for automobile hub paint and a synthetic method thereof. The polyester modified hydroxyl acrylic resin for automobile hub paint is prepared from, by weight part, 15-30 parts of methyl methacrylate, 3-10 parts of hydroxyethyl methylacrylate, 5-10 parts of 2-ethylhexyl acrylate, 1-5 parts of butyl acrylate, 5-15 parts of polyester prepolymer, 40-60 parts of organic solvent and 0.3-0.6 part of initiator. A paint film prepared from the polyester modified hydroxyl acrylic resin for the automobile hub paint has the advantages of being good in corrosion resistance at normal temperature, high in hardness and impact resistance, good in adhesive force and flexibility and the like and accordingly can be applied to the field of hub paint.

The invention relates to a monitoring device and method for total hydrocarbon concentration in high-hydrocarbon waste gas and mainly solves the problems that in the prior art, response speed is slow, a monitoring range is small and high-concentration hydrocarbon-containing gas impact is difficult to respond. According to the monitoring device and method for the total hydrocarbon concentration in the high-hydrocarbon waste gas, a high-hydrocarbon waste gas sample is sucked by a sampling pump along a gas pipeline and then is divided into two paths to pass through a ten-way valve to enter a flame ionization detector; a valve location (1) of the ten-way valve is connected with a carrier gas inlet, a valve location (4) and a valve location (8) are each connected with a sample gas inlet, a valve location (3) and a valve location (9) are connected with a sample gas outlet, a sampler outlet is connected with the flame ionization detector, a valve location (7) and a valve location (10) are connected with a quantitative pipe, and a valve location (2) and a valve location (5) are connected with the other quantitative pipe with the same volume. By means of the technical scheme, the problems can be better solved. The monitoring device and method can be applied to monitoring the total hydrocarbon concentration in the high-hydrocarbon waste gas.

The invention discloses a nano-inorganic ceramic spraying treatment technology for die-casting aluminum alloy cookware. Various nano-scale oxides are hydrolyzed and solidified at low temperature through an improved sol-gel reaction to form a paint film similar to ceramics and glass. . The nano-inorganic ceramic coating produced by the present invention has the functions of preventing surface oxidation, insulation, antistatic, waterproof, dust-proof, high hardness, wear resistance and non-stick and self-cleaning effect. At the same time, the nano-inorganic ceramic material is a kind of ultraviolet The absorbing material has good UV resistance, which greatly improves the use effect of the cooker.

The invention discloses a tool group of a tillage machine. The tool group comprises a rack tool shaft, tool bases, left curved blades and right curved blades, wherein the tool bases are fixedly connected with the tool shaft; the left curved blades and the right curved blades are fixedly connected in the tool bases; the tool bases for fixing the left curved blades and the tool bases for fixing the right curved blades are respectively distributed along spiral lines with the same spiral direction of outer walls of the tool shaft; the improvements are as follows: the two spiral lines for distributing the tool bases for fixing the left curved blades and the tool bases for fixing the right curved blades are the same in helical pitch, and the helix angles are 5-15 degrees; the tool bases for fixing the left curved blades and the tool bases for fixing the right curved blades are respectively arranged at equal intervals along the spiral lines; the left curved blades and the right curved blades are sequentially arranged in a staggered manner. The tool group has the advantages that the use effect of the tool group of the tillage machine is greatly improved, the tillage flatness degree is good, the working stability is enhanced, and loads of the tool shaft are uniform.

The invention discloses an anti-wear food tool. The anti-wear food tool is directly contacted with a food, and used for performing the operations of breaking, crushing or stirring on the raw materials of the food. The anti-wear food tool is made from 25CrMnSi alloy steel, and comprises the following ingredients: 0.22-0.26% of C, 0.90% of Mn, 0.90-1.20% of Si, 1.40-1.60% of Cr, 0.10% of Mo, 0.06-0.08% of Ti, 0.02-0.03% of Ti, and the balance of Fe and impurities, and the mass percent of P or S in the impurities is less than or equal to 0.01%. The anti-wear food tool is low in material cost, and capable of keeping the wear resistance of the processed acting surface, and preventing a metal material on the surface from falling and mixing in the raw materials of the food.

The invention provides a simulation control method for the motion characteristics of a multi-degree-of-freedom motor and relates to the technical field of motor control. The method comprises a step ofconstructing and drawing a virtual prototype model by using three-dimensional mechanical design software, a step of giving a motion constraint relationship between poses of components and physical characteristics and performing kinematics and dynamics analysis calculation, a step of realizing tilting operation, rotating running and space three-degree-of-freedom motion of the multi-degree-of-freedom motor and realizing interactive time domain simulation in virtual prototyping technology, and a step of realizing the sliding mode control of the motor under the cooperation of inner and outer rotors based on the motion of the multi-degree-of-freedom motor and the construction of a system joint platform. According to the invention, the point-to-point precise positioning of the three-degree-of-freedom motion can be achieved, the unfavorable factors such as input impact, external disturbance and parameter perturbation of a control system can be overcome, and the method has the advantages of high control precision, short development time, good design quality and high efficiency.

The invention aims to provide a constant-force conduction device. The constant-force conduction device comprises a force input end, a force output end, an upper force conduction piece, a first middleguide device and a connecting rod assembly, wherein the upper force conduction piece comprises a first upper force conduction piece and a second upper force conduction piece; the connecting rod assembly comprises a first connecting rod assembly; one end of the first upper force conduction piece is connected with the force input end, and the other end of the first upper force conduction piece is connected with a first end of the first middle guide device; one end of the second upper force conduction piece is connected with a second end of the first middle guide device, and the other end of thesecond upper force conduction piece is connected with the force output end; and one end of the first connecting rod assembly is connected with the force input end, the other end of the first connecting rod assembly is connected with the force output end, and the middle part of the first connecting rod assembly is connected with the first middle guide device. Through the arrangement for the connecting rod assembly, constant-force output is achieved; and the constant-force conduction device is simple in structure, and easy to machine and manufacture.

The invention discloses a spool of an electrohydraulic reversing valve, which comprises a connection structure, a plurality of buffer structures located at one end of the connection structure, and a spool working section arranged between the buffer structures; the connection structure includes a spool screw, a spool screw It is located at one end of the spool of the electro-hydraulic reversing valve; the buffer structure includes a pressure buffer section 1 and a pressure buffer section 2; By improving the original structure of the hydraulic reversing valve, the invention has the advantages of automatic operation, small frictional resistance and small movement impact, and has broad development and application prospects.

The invention discloses a process for manufacturing special data cables for seismic detectors. The process includes steps of (1), stranding seven copper wires with the diameters of 0.28mm by the aid of tubular stranding machines; (2), performing insulation on core wires. The copper wires conform to BG/T3953 electrician round copper wire standards, the copper wires are stranded in the left-hand rotation directions, the stranding pitch is 12.5+/-0.2mm, and intermediate broken ends of each integral copper wire are not allowed to be welded with each other. The outer insulating diameters of the core wires are 1.55+/-0.05mm, and the thicknesses of the thinnest portions of the core wires are larger than 0.32mm. The process has the advantages that the core wires can be blue, yellow, brown and gray and are uniform in chromaticity, have smooth appearance and are free of bubbles and impurities, insulating materials are made of modified communication-level polypropylene, shortcomings of poor low-temperature impact resistance, easiness in ageing and burning, high molding shrinkage and the like of common polypropylene can be overcome by the modified polypropylene, and the special data cables are excellent in electric performance, heat resistance and fatigue bending resistance.

The invention relates to a diffusion rectification flow equalizing structure. The diffusion rectification flow equalizing structure structure comprises a shell which is through in the front-back direction, a diffusion pipe is installed at an opening in the front end of the shell in a lining mode, a concave diffusion cone is installed at the rear end of the diffusion pipe, a rectifying plate is installed on the inner wall, located behind the diffusion pipe, of the shell, and the shell located behind the rectifying plate communicates with a heating cavity. Through holes for medium circulation are formed in the edge, connected with the diffusion cone, of the diffusion pipe, the diffusion cone and the rectifying plate. The middle of the rectifying plate protrudes backwards to form a conical structure, and the peripheral edge of the rectifying plate is connected with the inner wall face of the shell through fasteners arranged at intervals. A medium enters from the front end of the diffusion pipe, one part of the medium horizontally enters the shell through the through holes in the diffusion cone, the other part of the medium diffuses under the conical surface flow guide effect of the diffusion cone and enters the shell through the through holes in the diffusion pipe, the medium entering the shell flows to the rear heating cavity through the through holes in the rectifying plate, diffusion and rectification of the medium are completed, so that the flow equalization and stabilization of the medium are realized in a short distance, and the practicability is good.

The invention relates to an automobile A-pillar structure, a vehicle and a manufacturing method of the A-pillar structure, and aims at the automobile A-pillar structure, the automobile A-pillar structure is of an integrally extruded cavity structure, cavities are distributed in the axial direction of an A-pillar body, pipe fittings are arranged in the cavities, the pipe fittings are distributed in the axial direction of the cavities, and the A-pillar body is in bending fit with the pipe fittings. The vehicle provided by the invention comprises the A column structure, and the manufacturing method provided by the invention specifically comprises the following steps: S1, an extrusion die is connected to extrusion equipment; S2, the aluminum alloy cast ingot is heated; S3, an extrusion device extrudes the aluminum alloy cast ingot for extrusion; S4, the extrusion part is pulled; and S5, the aluminum alloy is converted into an extrusion part. And S6, the pipe fitting is embedded into the A column body, and then the overall structure is stretched and bent, or the pipe body and the A column body are stretched and bent correspondingly, and then the pipe fitting is embedded into the A column body. Lightweight design of an automobile is facilitated, and the column A is reinforced.

The invention discloses a wind- and wave-preventing alga seedling culture device and aims to overcome the defect that alga seedling survival rate is lowered due to the fact that alga seedlings are easily impacted by sea waves during culture. The wind- and wave-preventing alga seedling culture device comprises a transparent and vertically-through protecting cylinder, a transparent and vertically-through rotary cylinder and a positioning weight block and is characterized in that a support is connected into the protecting cylinder, an alga culture medium is connected onto the support, the rotarycylinder is rotatably mounted in the protecting cylinder, protecting cylinder and the rotary cylinder are provided with light-permeable notches facing the alga culture medium, the two light-permeablenotches are correspondingly arranged and are staggered through the rotation of the rotary cylinder, a swing rod is connected between the support and the positioning weight block, the protecting cylinder is suspended in water, a plurality of slide rods which can slide radially are evenly distributed below the support on the inner wall of the protecting cylinder and provided with racks, pinions coordinated with the racks are mounted in the protecting cylinder, inner toothed rings driven by the pinions to rotate are arranged on the inner wall of the rotary cylinder, the ends, close to the swing rod, of the slide rods are connected with arc-shaped push blocks, the swing rod is arranged among the arc-shaped push blocks, and reset springs are mounted between the other ends of the slide rods andthe protecting cylinder.

The invention discloses a wear-resisting food mechanical material. Raw materials of the wear-resisting food mechanical material comprise, by mass percent, 3.0%-3.5% of C, 0.5%-1.0% of Si, 1.5%-2.0% of Cr, 0.8%-1.0% of V, 0.5%-0.8% of Mn, 0.4%-0.7% of Ni, 0.05%-0.1% of B, 0.05%-0.1% of W, 0.06%-0.08% of Ce and the balance Fe. In addition, the invention provides a preparation method of the wear-resisting food mechanical material. According to the wear-resisting food mechanical material and the preparation method, through optimization of elemental constituents, the hardness, wear resistance, strength of extension, heat stability, impact toughness, oxidation resistance and mechanical fatigue resistance of the mechanical material are improved; the prepared wear-resisting food mechanical material can overcome wear, corrosion and impacting in food processing; contamination of falling of tiny particles on the surface to food raw materials is avoided; and food sanitation and human health are guaranteed.

The invention aims to provide a constant force conduction device which comprises a force input end, a force output end, an upper force conduction piece, a first intermediate guiding device, a straightmoving connecting rod assembly, wherein the upper force conduction piece comprises a first upper force conduction piece and a second upper force conduction piece, one end of the first upper force conduction piece is connected to the force input end while the other end of the first upper force conduction piece is connected to a first end of the first intermediate guiding device, one end of the second upper force conduction piece is connected to a second end of the first intermediate guiding device while the other end of the second upper force conduction piece is connected to the output end, and one end of the straight moving connecting rod assembly is connected to the force input end while the other end of the straight moving connecting rod assembly is connected to the force output end. The constant force device is simple and compact in structure, high in respond speed, good in stability and high in reliability, can output a constant force in a single-direction inputting working condition and can be used in application occasions such as an end executor of a robot.