268results about How to "Reduce processing requirements" patented technology

The invention belongs to the technical field of cables, and particularly relates to a high-temperature-resistant metallurgical vehicle-mounted flexible cable and a preparation method thereof. According to the high-temperature-resistant cable material, polyimide, polyphenylene sulfide and polybenzimidazole are matched, so that the high-temperature-resistant cable material is endowed with extremely high high temperature resistance, can resist the high temperature of 300 DEG C, and is extremely suitable for cable materials for metallurgy. Then, the flexibility of the material is improved by adding a flexible polyether-ether-ketone / nano silicon dioxide compound, and the surface of nano silicon dioxide is treated, so that the loading rate of polyether-ether-ketone can be increased, the phase separation phenomenon of polyether-ether-ketone in a blend is prevented, and uniform dispersion is promoted. And finally, the prepared high-temperature-resistant metallurgical vehicle-mounted flexible cable material is used as a filler and a sheath of the cable material, so that the cable structure is reduced, the production difficulty of the cable is reduced, the production process is simplified, and the material and process requirements are reduced, thereby achieving the purposes of reducing the cost and improving the production efficiency to a certain extent.

The invention relates to the technical field of cutterhead machining, and discloses a clamping and positioning device for shield tunneling machine cutterhead production, which comprises a working table, a rotating assembly is arranged at one end of the top surface of the working table, a pushing assembly is arranged at the other end of the top surface of the working table, and a jacking assembly is arranged on the working table between the rotating assembly and the pushing assembly. A clamping assembly for positioning the center disc is arranged on the barrel, a containing assembly for placing the multiple edge blocks at intervals is arranged on the jacking assembly, and a limiting assembly for blocking the edge blocks is arranged on the workbench. The limiting assembly comprises a first limiting rod, a second limiting rod, a third limiting rod and a fourth limiting rod, wherein the first limiting rod and the second limiting rod are fixedly arranged on the workbench, and the third limiting rod and the fourth limiting rod are arranged on the workbench in an up-down sliding mode. The fourth limiting rod and the jacking assembly synchronously slide upwards and are driven by the same power source. By means of the center plate positioning device, the ends and the side blocks of the center plate can be effectively and conveniently located in an abutting mode, the requirement for machining procedures is reduced, and the production efficiency of enterprises is improved.

The invention relates to an anti-adherence micro-fluidic chip based on an interface suspension method, and a system and a use method thereof. The micro-fluidic chip comprises an upper substrate, a lower substrate, an inner phase flow channel, a shear phase flow channel, a liquid drop transportation flow channel, a liquid drop suspension auxiliary flow channel and a stepped structure. The inner phase flow channel and the shear phase flow channel form a flow focusing structure, and a circle of flow protection layer is formed on the inner wall of the liquid drop conveying flow channel through the auxiliary phase solution, so that the liquid drops are still bound on an interface even under the interference of gravity or other forces and are kept in a suspension state, and the liquid drops are prevented from being wetted, attached to the wall and hung on the wall. Through structure adjustment and auxiliary phase fluid protection, liquid drop suspension type transportation is achieved, the surface wetting and wall hanging phenomena in the microsphere generation process are effectively prevented, and the device has the advantages of being easy to manufacture, low in cost, capable of being repeatedly used and the like and is suitable for being applied to microfluidics in the fields of biomedicine, chemical analysis and the like.

The invention discloses an ultra-long depth-of-field reflective scanning super-resolution optical microscopic system and method. The system comprises a sample displacement module, an optical microscopic imaging module, an annular focusing light beam generation module, a light beam scanning module, a super-resolution focusing illumination and collection module, a super-resolution optical imaging module and a computer. By utilizing the advantages of annular focusing light beam illumination, high focusing efficiency of a traditional objective lens and high light beam scanning speed, efficient super-long-focal-depth super-resolution focusing illumination is realized, and then quick super-long-depth-of-field super-resolution optical microscopic imaging can be realized by adopting a traditional optical lens. The method can be applied to non-labeled super-resolution microscopic rapid imaging of biological samples, and can also be applied to the fields of industrial related super-resolution microscopic detection and the like.

The utility model discloses an all-plastic self-suction quantitative suction pipe and an injection molding structure thereof. The all-plastic self-suction quantitative suction pipe comprises a top air bag, a breather pipe and a quantitative self-suction pipe, a traditional connecting structure and a traditional manufacturing technology are changed, the top air bag, the ventilation pipe and the quantitative self-suction pipe are integrally formed from top to bottom and are all made of hydrophilic materials, and therefore the quantitative self-suction pipe can automatically suck liquid, a glass capillary does not need to be inserted again, and the technology requirement is lowered. The product size stability is good, and large-scale efficient batch production can be realized; after injection molding, the upper end of the top air bag is open, so that core pulling can be carried out from the upper end of the top air bag, and finally, the upper end of the top air bag is sealed by hot melting, which is the key point of the design of the utility model, and the technical barrier that injection molding cannot be carried out in the prior art is overcome.

The invention discloses a spring operating mechanism for a medium-voltage sulfur hexafluoride circuit breaker, and belongs to the technical field of circuit breakers, and the spring operating mechanism comprises a frame, an energy storage assembly, a main shaft assembly, a closing assembly, an energy storage indication assembly, a manual opening and closing assembly, an emergency opening assembly, a closing locking assembly and an interlocking assembly. According to the spring operating mechanism, closing and opening operation of the contact of the medium-voltage sulfur hexafluoride circuit breaker is achieved through rotation of the mechanism output connecting lever, the spring operating mechanism has the advantages of being integrated in design, high in reliability, low in machining requirement, easy to assemble, controllable in cost and high in response speed, the energy storage state is displayed through the energy storage indication assembly, and the operation efficiency is improved. Opening and closing states are displayed through the opening and closing indication board, and display is visual; moreover, the emergency opening operation is realized through the emergency opening assembly, the closing and locking operation is realized through the closing and locking assembly, and the interlocking operation is realized through the interlocking assembly, thereby improving the safety.

The invention relates to an HGT tumor marker screening method and device, computer equipment and a storage medium. The method comprises the following steps: extracting microorganisms of a to-be-screened object as target microorganisms; obtaining a gene sequence of the target microorganism as a target gene sequence; obtaining a first HGT event from the target gene sequence; the first HGT event is subjected to normalization, and a normalized first HGT event is obtained; performing reliability verification on the normalized first HGT event to obtain a second HGT event; and according to the second HGT event and a standard HGT event, obtaining the HGT tumor marker probability of the to-be-screened object. The HGT tumor marker probability of the to-be-screened object can be obtained through the HGT event, and the cost is low.

The invention discloses a reflective scanning super-resolution optical microscopy system and method based on light cone illumination. The system comprises a sample displacement module, an optical microscopy imaging module, an annular focusing light beam generation module, a light beam scanning module, a super-resolution focusing illumination and collection module, a super-resolution optical imaging module and a computer. By utilizing the advantages of annular focusing light beam illumination, high focusing efficiency of a traditional lens and high light beam scanning speed, high-efficiency long-focal-depth super-resolution focusing illumination is realized, and rapid super-resolution optical microscopic imaging can be realized by adopting a traditional optical lens; non-marking far-field super-resolution two-dimensional microscopic rapid imaging is realized through two-dimensional light beam scanning; non-label far-field super-resolution two-dimensional microscopic imaging is carried out on samples at different axial positions, super-resolution two-dimensional microscopic imaging of different cross sections of the samples is obtained, and then three-dimensional chromatography is achieved. The method can be applied to non-labeled super-resolution microscopic rapid imaging of biological samples, and can also be applied to the fields of industrial related super-resolution microscopic detection and the like.

The invention belongs to the technical field of synthesis of organic chemical products through olefin carbonylation, and particularly relates to a catalyst system for ethylene carbonylation reaction. The catalyst system includes a palladium salt, one or more phosphine ligands, and one or more phosphorus (P)-containing compounds as stabilizers; the molar ratio of the palladium to the phosphine ligand to the stabilizer is 1: (1-6): (60-1000). According to the method, the phosphorus (P)-containing compound serving as the stabilizer is introduced to replace the sulfonic acid, direct use and supplement of the sulfonic acid are avoided, the catalytic activity and stability of a catalyst system can be improved, the equipment and process requirements can be reduced, and the method has a good application prospect.

The invention relates to the technical field of electronic products, and discloses a mounting assembly for a middle frame and electronic equipment. The mounting assembly for the middle frame comprises a mounting piece and an elastic piece, one part of the mounting piece is accommodated in the accommodating groove of the middle frame and is used for mounting a key of the middle frame; and when the mounting piece is accommodated in the accommodating groove, at least one part of the elastic piece is elastically extruded between the mounting piece and the groove side wall of the accommodating groove. According to the mounting assembly provided by the invention, the key can be firmly mounted in the middle frame without shaking, meanwhile, the processing requirement on the size of the middle frame is low, and the mounting assembly is convenient to disassemble and assemble.

The invention belongs to the technical field of sealing, and particularly relates to a combined sealing piece, a manufacturing method thereof and a sealing structure. The combined sealing piece comprises a first supporting ring, a second supporting ring, a first graphite ring, a second graphite ring and an alloy ring. The first graphite ring and the second graphite ring are constructed to be capable of conducting sealing operation on the first sealing face and the second sealing face correspondingly, and the alloy ring is constructed to be capable of being melted in response to temperature rising, so that radial acting force on the first graphite ring and the second graphite ring is generated under axial extrusion of the first supporting ring and the second supporting ring; therefore, the sealing effect on the first sealing surface and the second sealing surface is enhanced. According to the combined sealing element, the related requirements for sealing in the high-temperature and high-pressure environment can be met, the combined sealing element can be further suitable for low-speed dynamic sealing occasions, and the combined sealing element has good application prospects in the technical field.

The invention belongs to the technical field of contact lenses, and provides a contact lens ink and a preparation method thereof, the product comprises the following preparation raw materials by mass: 30-40 parts of a hydrophilic monomer, 10-20 parts of an organosilicon monomer, 10-15 parts of a functional monomer, 5-15 parts of a solvent, 1-5 parts of an auxiliary agent, 1-2 parts of a chain transfer agent, 0.5-1 part of a cross-linking agent, 0.5-0.8 part of an initiator, 1-5 parts of a pigment, and 1-1.5 parts of triethylene diamine. The organic silicon monomer enables the contact lens to have a double-channel structure of a silicon channel and a water channel, and oxygen in the air can penetrate through the lens to be in contact with the cornea, so that the oxygen deficit condition of eyes wearing the contact lens is improved. Meanwhile, the added auxiliaries are meglumine and allyloxy hydroxypropyl sodium sulfonate, and hydroxyl and sulfonic acid groups have hydrophilicity, so that the stability of the ink is improved, the contact angle of the surface of a lens can be obviously reduced, the surface wetting degree is increased, and the problem of difficult wetting is solved.

The utility model provides an adjusting mechanism for a calendaring roller structure. The adjusting mechanism comprises a rack, a first fixing seat, a second fixing seat and a driving roller, wherein the first fixing seat and the second fixing seat are fixedly installed on the two sides of the top of the rack, and the driving roller is rotationally connected between the first fixing seat and the second fixing seat. According to the adjusting mechanism for the calendaring roller structure, a first sliding block and a second sliding block can be driven to move reversely along a sliding rail by rotating a two-way lead screw, and meanwhile a first sliding seat and a second sliding seat can be driven to move synchronously on the inner side of a rack through cooperation of a fixing pin and a supporting plate; the first sliding base and the second sliding base can drive the driven roller to move synchronously while moving, then the distance between the driven roller and the driving roller is adjusted, and by the adoption of the structure, synchronous movement of the two sides of the driven roller can be achieved only by installing a set of threaded transmission structures below the driven roller; the requirement for machining and mounting precision of transmission parts is relatively low, and cost and maintenance cost are reduced.

The invention provides a sectional type fan blade and a transportation method thereof. The sectional type fan blade comprises a blade root, the blade root is provided with a framework, and the framework is provided with a plurality of blade sections; the blade sections are connected with the framework through mounting pieces; the blade root is used for connecting a wind driven generator hub; a soft cushion is arranged at the joint of every two adjacent blade sections; the blade section is cylindrical, and the framework penetrates through the blade section. According to the sectional type fan blade, large transportation equipment does not need to be used during transportation, the road environment does not need to be changed during land transportation, the transportation efficiency is higher, the influence of the environment is smaller, and the transportation cost is lower; the fan blade framework and the fan blade are produced and machined in a sectional mode, the machining mode is simple, a large mold does not need to be used, and therefore the machining cost is greatly reduced.

The utility model discloses a charging socket with a novel integrated terminal structure. The charging socket with the novel integrated terminal structure comprises a main seat, a PCB, a plurality of signal jack pieces, a plurality of expansion spring sleeves and a plurality of copper sleeves, the rear end face of the main base is in threaded connection with the PCB, and the front end face of the main base is provided with at least one signal end. The signal end is provided with a plurality of first shaft holes. The outer end of the cylindrical body of the signal jack member is sleeved in the first shaft hole. The outer end face of the body is provided with a plug hole, and the inner end face is provided with a connecting section. The two end rings of the expansion spring sleeve are connected with the two ends of the hollow spring body in an equal-diameter shaft sleeve connecting section, and the spring body elastically deforms outwards in the circumferential direction to be attached to an inner hole of the copper sleeve. And the copper sleeve is inserted into a positioning hole of the PCB in a sleeving manner. According to the technical scheme of the utility model, the pins are assembled in a unified and integrated manner, so that integrated signal transmission is realized. The assembly is convenient, the efficiency is high, and the product precision is improved.

The invention relates to a four-passband power dividing filter based on microstrip line four-mode resonators. The four-passband power dividing filter comprises a dielectric substrate, a metal grounding plate, a central input port feeder line, two output port feeder lines, four microstrip four-mode resonators and two isolation resistors. A first micro-strip four-mode resonator and a second micro-strip four-mode resonator are arranged between the central input port feeder line and the first output feeder line. A third micro-strip four-mode resonator and a fourth micro-strip four-mode resonator are arranged between the input port feeder line and the second output feeder line. The first isolation resistor is bridged between the first micro-strip four-mode resonator and the third micro-strip four-mode resonator, and the second isolation resistor is bridged between the second micro-strip four-mode resonator and the fourth micro-strip four-mode resonator. Good output port isolation is achieved, good frequency table selectivity is achieved, the output ports are highly isolated, insertion loss is small, the structure is compact, production cost is low, and the filter is suitable for a modern wireless communication radio frequency front-end circuit system.

This utility model relates to the field of medical equipment technology, and in particular to an animal vaccine injection booster device, comprising a first air chamber, a second air chamber, a piston assembly, and a gun body; the gun body has a first air chamber and a second air chamber, the first air chamber having a gas source inlet, a gas outlet, and a gas delivery outlet, the gas delivery outlet communicating with the second air chamber, and a control valve also being provided in the first air chamber; when the trigger of the gun body presses the control valve, the control valve blocks the connection between the gas delivery outlet and the gas outlet; when the trigger of the gun body is released, the control valve blocks the connection between the gas delivery outlet and the gas source inlet; the second air chamber has a piston assembly, the piston assembly including a piston and a firing pin, the firing pin being disposed on the piston, and an elastic element being provided between the piston and the firing pin output end of the second air chamber; the trigger is disposed on the grip part of the gun body, the grip part having a grip groove on the side near the trigger, and a thumb groove on the top side of the grip part away from the trigger. This utility model is easy to operate and has a good grip feel.

The invention discloses a method for synthesizing a cefvimicin mother nucleus by an enzymic method, which belongs to the technical field of medicine synthesis, and comprises two working sections: 1, removing a carboxyl protecting group from a double-protection mother nucleus Sm to obtain an aqueous solution of a salt of an intermediate A; and 2, removing an amino protecting group from the intermediate A by an enzymic method to obtain the cefvimicin mother nucleus. The process for preparing the cefvimicin mother nucleus is green and environment-friendly, does not have harsh conditions such as no water, no oxygen, ultralow temperature and the like, does not generate substances with strong corrosivity, is friendly to production equipment, is easy to recycle a waste solvent, and has low wastewater treatment requirements.

The utility model provides a power battery pack and electric equipment. The power battery pack comprises a box body, a plurality of battery monomers, a heat management part and an equipotential part, the plurality of single batteries are arranged in the box body along a first direction and a second direction, the heat management component extends along the first direction and is arranged in the box body, and at least part of the heat management component is connected between two adjacent single batteries in the second direction; a conductive part is arranged on the side, close to the box body, of the heat management component and is in equipotential connection with the heat management component, and the equipotential piece is connected between the conductive part and the box body so that equipotential connection between the heat management component and the box body can be achieved. According to the power battery pack disclosed by the utility model, the electric conduction part is arranged on the heat management part, so that equipotential connection between the heat management part and the box body is realized.

The invention relates to a wafer recovery method, a diffractive optical waveguide manufacturing method, and a diffractive optical waveguide. The wafer recycling method comprises the following steps that a diffraction optical waveguide to be recycled is provided, the diffraction optical waveguide to be recycled comprises a substrate wafer, a cut-off layer and a grating wafer which are arranged in a stacked mode, and the surface of the cut-off layer and / or the surface of the grating wafer have defects caused by etching; carrying out etching and / or chemical mechanical polishing on the defect surface of the diffraction optical waveguide to be recycled until the preset surface roughness is reached, so as to obtain a recycled wafer; the manufacturing method of the diffraction optical waveguide comprises the following steps of forming a thin film wafer on the surface of a cut-off layer of a receiving sheet, and carrying out etching treatment on the surface of the thin film wafer, and S3, before manufacturing is completed, if the cut-off layer and / or the surface of a grating wafer have defects caused by etching, preparing a recycled wafer according to the recycling method. According to the method, recycling of unqualified products is achieved, the production cost is reduced, the stability of the performance of the recycled products is improved, and the method is suitable for medium-batch and large-batch machining and manufacturing of the silicon carbide diffraction optical waveguides.

The invention relates to the technical field of planetary gear structure lubrication, in particular to a multi-connection planetary gear structure with a lubrication system and a gearbox. The multi-connection planetary gear structure comprises an intermediate shaft; the planet carrier is rotatably installed on the intermediate shaft, the oil distribution sleeve is arranged on the intermediate shaft in a sleeving mode, a first ring groove is formed in the inner wall of the oil distribution sleeve, and a second ring groove is formed in the outer wall of a second bearing plate of the planet carrier; an oil way channel capable of being communicated with the outside is formed in the middle shaft, and the oil way channel can be communicated with an inner oil way of the planet pin shaft and can be communicated with a to-be-lubricated area of a planet wheel bearing inner ring. By means of the single oil inlet and the multiple oil holes extending in the radial direction, corresponding installation bearings of the multiple planet gears in the same phase can be lubricated at the same time, an additional sealing structure does not need to be arranged, the form is simple, and the multi-row compound planet gear can be suitable for various multi-row compound planet gears in the arrangement form.

The utility model relates to the field of microscopes, in particular to a microscope and a microscope objective. The microscope objective comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially and coaxially arranged from the image space to the object space. The first lens is a negative lens, a second lens, a third lens and a fourth lens; the focal length of the microscope objective is f, and the focal lengths of the first lens, the second lens, the third lens and the fourth lens are f1, f2, f3 and f4 in sequence; wherein the result is-3.0 lt; f1 / flt; -2.5,-2.5; 2.0 lt; f2 / flt; 2.8); 101t; 101t; f3 / flt; 50; 1.2 1t; f4 / flt; and 1.5. The microscope objective can meet the requirements of low conjugate distance, low processing cost and long working distance while obtaining high-resolution imaging performance, and is suitable for being matched with a thick cover glass to complete automatic biological cell detection.

Disclosed is a method for synthesizing aluminum nitride by microgravity combustion, which uses Mg4Al3 or Mg 17 Al 12 powder as raw material, and performs combustion in a microgravity and nitrogen atmosphere, and then purifies the combustion product using hydrochloric acid to obtain AlN powder. The method is applicable to both small particles (1 μm in diameter) and large particles (500 μm in diameter), and has a short synthesis time, high purity of the obtained aluminum nitride, and the heat generated by combustion can be used to maintain the temperature of the synthesis chamber, thereby reducing energy consumption.

The invention provides a skeleton type detachable segmented fan blade and a processing method thereof, the skeleton type detachable segmented fan blade comprises a mounting seat, the mounting seat is provided with a skeleton, and the skeleton is provided with a plurality of blades; connecting frames are arranged in the blades, the framework is provided with guide rails, the connecting frames are matched with the guide rails, and the blades are connected with the framework through the connecting frames and the guide rails. The mounting base is used for connecting a wind driven generator hub. In the production process, a large mold does not need to be used, machining forming of the blade can be completed through a small mold, operation is simpler, and cost is lower; the sectional type detachable blades are adopted, when part of or a single blade is damaged, only the corresponding blade needs to be replaced, the whole fan blade does not need to be replaced, the replacement and maintenance cost is lower, and the replacement efficiency is higher.

The invention relates to a radiation meter dense feed source array directional diagram optimization method based on a generative adversarial network. The method comprises the following steps: constructing a training data set, a condition vector containing a target directional diagram performance index and a corresponding optimal amplitude-phase weight vector; designing a conditional generative adversarial network model; constructing a physical constraint loss function by embedding a differentiable electromagnetic calculation module; loading the constructed training data set, and training a complete generative adversarial network model based on a loss function embedded with a differentiable electromagnetic calculation module; and when the system antenna pattern obtained according to the amplitude-phase adjustment parameters output by the generative adversarial network model meets the antenna pattern evaluation index, completing dense feed source array antenna pattern optimization. According to the method, the target weight is dynamically adjusted and optimized on orbit, so that a single model can adapt to beam forming requirements in different observation scenes, and flexible switching of multiple task modes such as high-resolution detection and wide-range general survey is realized.

The invention provides a preparation method of a solid solution oxygen reinforced Ti15Zr alloy with an ultra-fine grain structure. The mechanical property of the material is synchronously improved through solid solution oxygen atom strengthening and ultra-fine grain structuring, on the basis, a fine grain structure is reserved through a vacuum heat treatment process, meanwhile, a deformed structure is eliminated, the plasticity of the material is recovered, the comprehensive performance of the Ti-Zr alloy is further improved, and the safety of the Ti-Zr alloy in the human body service process is met.

The utility model is suitable for the technical field of equipment installation, and provides a suspended ceiling installation frame which comprises a fixing structure, an installation structure, a rotary connecting piece, a connecting rod and an electric push rod. The mounting structure is rotationally connected with the fixing structure. The electric push rod drives the mounting structure to rotate relative to the fixing structure, so that the mounting structure is switched between the folding configuration and the unfolding configuration. In the process that the fixing structure rotates relative to the mounting structure, the first end of the connecting rod rotates relative to the mounting structure, and the second end of the connecting rod rotates in the sliding groove of the fixing structure and can slide along the sliding groove. Compared with an existing complex multi-connecting-rod structure arranged between a mounting structure and a fixing structure, the connecting rods are simple in structure and movement mode, the requirements for machining precision and movement matching degree are lowered, the problem that the mounting structure is prone to shaking or blocking when rotating relative to the fixing structure is solved, and the service life of the connecting rods is prolonged. And therefore, the stability and smoothness of the operation of the suspended ceiling mounting frame are improved.

The utility model provides an oily sludge treatment device. The oily sludge treatment device comprises a preheating unit, a thermal desorption reactor, a dust removal unit, a condensation unit, a tail gas treatment unit, a dry powder processing unit, a cooling water storage unit and an oil storage tank, oily sludge enters the preheating unit, and the top of the preheating unit is connected with the bottom of the thermal desorption reactor; one side of the thermal desorption reactor is connected with the upper side surface of the dust removal unit; the lower part of the thermal desorption reactor is connected with the top of the dry powder processing unit; the upper part of the dedusting unit is connected with the bottom of the condensing unit; the lower part of the dedusting unit communicates with the top of the dry powder processing unit; the lower part of the condensing unit is connected with the cooling water storage unit, the upper part of the condensing unit is communicated with the bottom of the preheating unit, the bottom of the condensing unit is connected with an oil storage tank, and the top of the condensing unit is connected with the tail gas treatment unit through a pipeline. The oil separation device has the beneficial effects that oil can be relatively thoroughly separated from solid components, and the oil content in obtained solid residues is extremely low.

The utility model relates to the technical field of valve, specifically relates to a ball valve seat device, and with the valve core device cooperation uses, valve seat device includes metal valve seat and valve seat hard material lining, in the switch process of valve, the valve seat sealing surface of metal valve seat is used for with the valve core sealing surface of metal valve core abuts, be equipped with valve seat hard material lining in metal valve seat for powder transmission, in powder transmission, especially under high pressure condition, need better wear resistance and higher pressure capacity, metal valve seat has higher pressure capacity, is not easy to break, the valve seat hard material lining that sets up in metal valve seat, has better wear resistance, and has relatively thick thickness, has improved the service life of valve seat device, simultaneously, the material use of valve seat hard material lining is less, and the processing requirement is not high, makes the cost of valve seat device greatly reduces.

The utility model discloses a kind of floating rack steering axle structures, belong to fork truck steering axle field. Including: slewing support, cylinder barrel assembly, floating rack assembly and support pinion shaft. Cylinder barrel assembly includes left cylinder barrel and right cylinder barrel, left cylinder barrel open end is fixedly inserted in the inside of slewing support left side interface, right cylinder barrel open end is fixedly inserted in the inside of slewing support right side interface;Floating rack assembly includes rack body, left piston and right piston, left piston is slidably embedded in left cylinder barrel, left piston is tightly attached to rack body left end, right piston is slidably embedded in right cylinder barrel, right piston is tightly attached to rack body right end;The top gear ring of support pinion shaft is engaged with the transmission gear portion opened in the middle part of rack body. The utility model reduces cylinder barrel machining precision requirement, assembly efficiency is improved by more than 20%, compresses slewing support axial space 15%-20%, oil seal life is extended to 2 times of traditional structure.