63results about How to "Strong force" patented technology

The invention provides a supported catalyst as well as a preparation method and application thereof. The preparation method of the supported catalyst comprises the following steps: S1, carrying out precipitation reaction on vanadate and first ammonium salt in a first solvent to obtain a first product system containing a carrier precursor; s2, enabling the carrier precursor, a second ammonium salt, a noble metal-containing compound, a chelating agent and a first reducing agent to react in a second solvent to obtain a second product system containing a catalyst precursor; and S3, carrying out annealing treatment on the catalyst precursor and a second reducing agent in protective gas to obtain the supported catalyst. The noble metal in the supported catalyst prepared by the method is not easy to migrate and aggregate, and the stability is better. In addition, the dosage of precious metal needed by the preparation method is smaller, and the atom utilization rate is higher.

The invention belongs to the technical field of textile fabrics, and particularly relates to an ultraviolet-proof antibacterial fabric and a preparation method thereof. The ultraviolet-proof antibacterial fabric comprises a base cloth layer and a modified polyester fabric layer, the modified polyester fabric is obtained by dipping a polyester fabric in a finishing liquid; the finishing liquid comprises a first finishing liquid and a second finishing liquid; the first finishing liquid is prepared from the following raw materials: a carboxymethyl chitosan derivative and polycarboxylic acid; the second finishing liquid is prepared by mixing nano titanium dioxide and absolute ethyl alcohol. According to the invention, the pre-treated polyester fabric is subjected to secondary surface modification by using the finishing liquid, and the durability of the fabric product is remarkably improved by using a covalent grafting mode.

The invention discloses a synthesis method and application of a special dispersant for polar rubber carbon black, and relates to the technical field of rubber auxiliary materials. The synthesis method of the special dispersant for polar rubber carbon black comprises the following steps: in an inert protective gas atmosphere, carrying out heat preservation reaction on polyether amine, absolute ethyl alcohol and an acrylate monomer to obtain an intermediate I; in an inert protective gas atmosphere, carrying out heat preservation reaction on the intermediate I, a catalyst I and fatty diacid to obtain an intermediate II; and in an inert protective gas atmosphere, carrying out heat preservation reaction on the intermediate II, a catalyst II and fatty monoacid to obtain the special dispersing agent for the carbon black for the polar rubber. The prepared special dispersant for polar rubber carbon black has good precipitation resistance in polar rubber such as nitrile rubber, and can uniformly disperse the carbon black and improve the mechanical properties and apparent properties of the rubber.

The invention provides a catalyst, a preparation method and a method for efficiently synthesizing 3-methylpyridine, and belongs to the technical field of organic synthesis.2-methylvaleronitrile is subjected to a hydrogenation dehydrogenation reaction under the action of the catalyst, and a product 3-methylpyridine and a byproduct amino-3-methylpyridine are prepared. According to the present invention, the 3-methylpyridine is directly prepared by using the 2-methylglutaronitrile as the raw material and carrying out the hydrogenation reaction and the dehydrogenation reaction under the action of the same catalyst, such that the synthesis route is simple and efficient, the product selectivity is high, no intermediate by-product or impurity is generated, the metal element doped in the catalyst system is economical, efficient and easily available, the catalyst activity is extremely high, and the method is suitable for industrial production. Compared with other technologies, complicated rectification, separation and purification procedures are not needed, the economic benefit is greatly improved, and industrial mass production can be realized.

The utility model relates to the technical field of automobile fuse supports, and discloses a BDU fuse support assembly which comprises a support body, the top of the support body is fixedly connected with a plurality of M screws, M nuts and M nuts, the support body is provided with a plurality of mounting grooves, bushings are fixedly connected in the mounting grooves, and the M screws, the M nuts and the M screws are fixedly connected in the mounting grooves. According to the BDU fuse support assembly, the M5 screw 2, the M5 nut 3, the M4 nut and the support body are subjected to plastic coating molding, and the circular lining and the kidney-shaped lining are assembled together with the support body in a press fitting mode, so that the firmness of the support body after connection is improved, the stability of the BDU fuse support is effectively improved, the service life of the BDU fuse support is prolonged, and the service life of the BDU fuse support is prolonged. Therefore, the BDU fuse support can bear stronger acting force at the positions where the screws and the bushings are assembled, and the BDU fuse support is effectively prevented from cracking and breaking in the using process.

The invention relates to the field of polymer materials, and discloses a super absorbent fiber for a core layer material of a diaper. The super absorbent fiber comprises the following raw materials in parts by weight: 70 to 90 parts of sodium acrylate solution, 20 to 45 parts of polyacrylamide microspheres, 2 to 10 parts of modified hydroxyethyl methacrylate, 10 to 30 parts of polyvinyl alcohol solution, 0.5 to 5 parts of an initiator, and 1 to 5 parts of a crosslinking agent; the polyacrylamide microspheres are prepared by an inverse suspension polymerization method; the modified hydroxyethyl methacrylate is hydroxyethyl methacrylate grafted with oxidized multi-walled carbon nanotubes to modify hydroxyethyl methacrylate. The invention improves the water absorption rate, salt resistance and fracture toughness of the super absorbent fiber by adding polyacrylamide microspheres and modified hydroxyethyl methacrylate.

The utility model discloses a kind of foundation structure and wind turbine generator set of wind turbine generator set, it is related to wind power generation technical field, wherein, foundation structure includes first bearing platform, second bearing platform, multiple bored piles and multiple anchor rods, the top surface of first bearing platform is connected with the connecting cylinder for connecting the tower cylinder of wind turbine generator set;Second bearing platform is set below first bearing platform, the top surface of second bearing platform projects the bottom surface of first bearing platform and forms step surface, the vertical projection of the bottom surface of first bearing platform in second bearing platform forms core area, the edge of second bearing platform forms the expansion area surrounded in core area;Multiple bored piles are distributed in core area with interval, each bored pile extends downward from the bottom surface of second bearing platform, and bored pile is vertically arranged;Multiple anchor rods are distributed in expansion area with interval, and anchor rod extends downward from the bottom surface of second bearing platform and is arranged with inclination.The foundation structure has good bearing capacity and stability, can guarantee the safety and stability of wind turbine generator set in long-term operation process.

A kind of ground consolidation ramming device, the ground ramming technical field, including ramming unit, further include: vertical arm, first ramming plate, receiving slot, let place slot, pivot, rotating seat and second ramming plate, vertical arm is vertically arranged along vertical direction;First ramming plate is vertically and fixedly installed at the bottom end of vertical arm;Receiving slot is provided with two, and two receiving slots are symmetrically opened on the upper surface of second ramming plate.The utility model can flexibly control the folding, unfolding state of second ramming plate at first ramming plate, to adjust the ground ramming contact area;When increasing area, single-time ramming area is larger under the same construction scale, reduces the frequency of repetition, improves construction efficiency;Second ramming plate is retracted to first ramming plate, and ramming area can be reduced, which is convenient for narrow area operation;It can be adjusted according to the ground condition, adapt to complex working conditions, improve the versatility and flexibility of equipment, reduce equipment purchase cost.

The utility model relates to generator set auxiliary equipment technical field discloses a diesel generating set mute big cover convenient for overhauling, including cover body, the cover body top is equipped with the cover body that is composed of two symmetrical cover plates, and the cover plate is through the sliding block and the inverted T type sliding slot of cover body top sliding fit, the inner wall of cover body is equipped with buffer mechanism, and the support arm of buffer mechanism is supported through the elastic support rod, and the support arm end is equipped with gyro wheel no.

The utility model relates to a wear-resistant and fracture-resistant medical cutter clamping device. The wear-resistant and fracture-resistant medical cutter clamping device comprises a main body, a push-pull piece sliding in the main body, a first block connected with a power source, a cutter detachably connected in the first block, a fourth block for limiting the concentricity of the cutter, a limiting piece for limiting the position of the cutter and an adjusting piece for adjusting the limiting piece to limit or detach the cutter, first grooves are formed in the end face of the body. The push-pull piece slides in the first groove; the fourth block is positioned in the first groove; a second groove is formed in the fourth block; a fixing piece is arranged in the second groove in a penetrating mode. The fixing piece penetrates through the push-pull piece and is in threaded connection with the adjusting piece; a third groove is formed in the first block; a fourth groove corresponding to the third groove is formed in the cutter; the limiting piece penetrates through the third groove and is clamped into the fourth groove. The adjusting piece slides on the first block; the limiting piece and the first block rotate synchronously. The problems that a cutter needs to be rapidly disassembled and assembled, stress on a clamping position is large due to transverse cutting force of the cutter in the rotary cutting process, and the clamping position can be broken are solved.

The utility model provides a financial bill binding device which comprises a base, a bearing table is arranged above the base, and a lifting device A is fixed between the bearing table and the base. A through hole A is formed in the bearing table and is positioned between the two lifting devices A; a lifting device B is mounted in the through hole A and can move along the through hole A; a mounting plate is fixed to the bottom end of the lifting device B. A drilling machine is fixed to the bottom of the mounting plate. A hollow sliding rod is further fixed to the bottom of the mounting plate, and the length of the sliding rod is larger than that of a drill bit of the drilling machine. A pressing plate is fixed to the bottom end of the sliding rod, an elastic piece is arranged in the sliding rod, and the elastic piece is in a compressed state in the sliding rod; a through hole B is formed in the pressing plate, and the position of the through hole B corresponds to the position of a drill bit of the drilling machine. The binding device has the advantages of being reasonable in design, high in practicability and convenient to use. By using the device, the problems of displacement and the like of bills during punching can be avoided, so that the uniformity of the obtained bill book is higher.

The utility model discloses a safety belt for a vehicle, which comprises a safety belt body and a seat, the safety belt body is mounted on the seat, the shoulder of the safety belt body is sleeved with a sheath, the sheath comprises a top layer and a surface layer, the two ends of the top layer and the two ends of the surface layer are connected with side curtains, and the side curtains are connected with the safety belt body. A through hole allowing the safety belt body to penetrate through is formed among the top layer, the surface layer and the side curtains. Through the arrangement of the sheath, a human body can be protected, and through the cooperative arrangement of the first elastic supporting piece, the second elastic supporting piece, the top layer and the surface layer, excellent elastic performance is provided, and good air permeability can be kept; the surface layer and the protection pad increase the contact area of the safety belt body and the shoulders of the human body, the shoulders are prevented from being directly pressed by the safety belt body, and excessive local stress on the shoulders is effectively prevented.

The invention relates to the technical field of road maintenance, and particularly discloses a road bridge and tunnel construction device which comprises a movable base, a water storage tank fixedly connected with the movable base, a mounting box with an opening in the bottom and an adjusting mechanism arranged in the mounting box. The mounting box is fixedly connected with the water tank, and air ports are formed in the two sides of the mounting box; the maintenance mechanism comprises a vertical pipe, a transverse pipe and adjusting assemblies symmetrically arranged on the two sides of the vertical pipe in the length direction of the vertical pipe. The vertical pipe is fixedly connected with the mounting box and is communicated with the water tank; the transverse pipe is communicated with the free end of the vertical pipe; the adjusting assembly comprises an adjusting pipe, an atomizing nozzle, a maintaining part, a side hole formed in the vertical pipe, a top hole formed in the transverse pipe, an adjusting block used for sealing the top hole and a driving part used for driving the adjusting block to do reciprocating motion in the length direction of the transverse pipe. The problem that an existing spraying device cannot carry out dust falling treatment on dust dispersed on a road surface is solved.

The four-way valve support assembly comprises a support body, the support body is formed by assembling a right side plate, a bent plate, a left side plate and a tail plate, the top of the front face of the right side plate is provided with a first round lining, the bottom of the front face of the right side plate is provided with a kidney-shaped lining, one side of the front face of the tail plate is provided with a second round lining, and the first round lining and the second round lining are arranged in parallel. The four-way valve support comprises a left side plate, M5 screws are arranged on the left side plate, a honeycomb-shaped plate is arranged on the surface of the left side plate, and the honeycomb-shaped plate is formed by arranging and combining a plurality of annular plates. According to the four-way valve support assembly, the M5 screw and the support body are subjected to plastic coating forming, and the first circular lining, the second circular lining, the kidney-shaped lining and the support body are assembled together in a press fitting mode, so that the stability of the four-way valve support can be effectively enhanced, and the positions, where the screws and the linings are assembled, of the four-way valve support can bear higher acting force; and the four-way valve bracket is effectively prevented from being cracked and fractured in the use process.

The invention discloses a preparation method of an sp2-carbon conjugated two-dimensional covalent organic framework (2D sp2C-COFs) film suitable for various substrates. Polydopamine (PDA) is used as a modification layer to assist in synthesizing the high-quality two-dimensional sp2C-COFs film on any substrate (ITO, a silicon wafer, quartz, a polytetrafluoroethylene tube and the like). According to the method, a firm PDA layer is formed on the surface of a substrate through oxidation auto-polymerization of dopamine, a large number of amino groups exist on the surface of PDA, covalent bond connection with a monomer with an aldehyde group can be formed through a Schiff base reaction, and then a high-quality 2D sp2C-COFs film is formed on the surface of the substrate through an aldol condensation reaction. The preparation method is simple, convenient to operate and high in universality, high-quality 2D sp2C-COFs films with different structures can be synthesized on various substrates, and the prepared material has efficient photon-generated carrier separation and transmission capacity.

The invention discloses high-modulus impact-resistant modified asphalt, which is mainly prepared from the following components in parts by weight: 2 to 7 parts of 2-(2-ethoxyl)-3A, 4, 7, 7A-tetrahydro-1H-4, 7-methoxy isoindole-1, 3 (2H)-diketone, 2 to 9 parts of gamma-phenyl-epsilon-caprolactone, 85 to 90 parts of matrix asphalt, 0.0003 to 0.0007 part of tricyclic [6.4.0.02, 7] dodecane-1, 8: 2, 7-tetracarboxylic acid dianhydride, and 0.001 to 0.003 part of stannous octoate (per mil). The invention also provides a preparation method of the high-modulus impact-resistant modified asphalt. The invention also provides an asphalt mixture. The invention also provides application of the asphalt mixture as a road building material in road maintenance or road construction. According to the high-modulus impact-resistant modified asphalt provided by the invention, gamma-phenyl-epsilon-caprolactone completes chain propagation, unreacted hydroxyl at the tail end and carboxylic acid groups newly generated after ring opening of tricyclic [6.4. 0.02, 7] dodecane-1, 8: 2, 7-tetracarboxylic dianhydride can form a large number of hydrogen bonds with ester groups on a long chain, so that network structures have stronger acting force, and the impact resistance of the asphalt is improved. And the impact resistance and energy absorption performance are higher.

The invention discloses a method for removing antimony by using alcamines adsorbent resin, and belongs to the field of environmental protection. The method comprises the following specific steps: adjusting the pH value of a solution containing antimony ions to 1-11, and then adding alcohol amine adsorption resin into the solution to adsorb the antimony ions in the solution; and after the alcamines adsorption resin is saturated in adsorption, eluting, concentrating, separating and regenerating the antimony loaded on the alcamines adsorption resin by using an eluent, so as to remove the antimony. The alcamines adsorbent resin is a resin material with a polyhydroxy structure on the surface obtained by modifying the surface of a base material, can efficiently adsorb antimony from an antimony-containing solution, has higher adsorption capacity, and can meet the filling use requirements of industrial adsorption columns. The raw materials are wide in source and low in cost; the material is simple to prepare, antimony can be efficiently and selectively removed in the adsorption process, and the adsorbent is high in regeneration capacity and has wide application value.

This invention provides a composite anode material, its preparation method, and its application. The preparation method includes the following steps: mixing and lithiating graphene material and lithium metal material in a protective atmosphere to obtain lithiated graphene material; wherein both the graphene material and the lithium metal material are in particulate form; mixing the metal material and the lithiated graphene material and heating to obtain the composite anode material. The composite anode material obtained by the preparation method of this invention is a lithium alloyed graphene material, which can guide the uniform deposition of metallic lithium, reduce the probability of lithium dendrite formation, and provide more electron pathways, enhancing lithium diffusion, thereby reducing the gap between the anode material and the solid electrolyte, reducing battery impedance, and improving battery cycle performance and rate performance.

The welding head comprises a head end and a tail end, the width of the head end is larger than that of the tail end, the head end comprises a horizontal bottom face and an inclined face, a preset acute included angle is formed between the inclined face and the horizontal bottom face so that the head end can be provided with a tip end, and the horizontal bottom face is perpendicular to the radial section of the tail end. Compared with the prior art, the welding head capable of being controlled to be heated is used for removing glue, other tools needed in the traditional glue removing process are omitted, then the convenience of removing the sealing glue is improved, and the operation process of removing the sealing glue is simplified. Moreover, the width of the head end of the welding head is designed to be larger than the width of the tail end of the welding head, so that the stress of the head end is increased, the welding head can be used for scraping the sealing glue, is more durable and cannot be broken in the process of scraping the softened sealing glue, and the service life and the use safety of the welding head are guaranteed.

The present invention discloses a special resin prepreg preparation device for in-situ pipeline repair, comprising a tank body, an automatic residue collection component, a timed automatic rotation component and an anti-water absorption pneumatic suction cup component. The present invention belongs to the technical field of solid impurity filtration. In order to solve the problem that residues are mixed in the resin or deposited on the bottom of the tank body during the resin preparation process, the present invention proposes a device that senses the internal pressure of the tank body to automatically collect the residues. Moreover, in order to ensure that the filtered residues can work in a closed loop, an anti-water absorption pneumatic suction cup component and a timed automatic rotation component are creatively proposed to complete the circulation work of collecting the residues, effectively solving the problem of residue deposition during the heating reaction process, and significantly improving the efficiency and effect of filtering small solid particle impurities in the resin.

The invention provides a novel semi-submersible type offshore wind power floating platform which comprises three main stand column structures, a set of overhaul channel and a supporting structure, the three main stand column structures comprise a fan stand column and two side stand columns, the fan stand column and the two side stand columns are arranged in a triangular mode, and a wind turbine generator set is installed on the top of the fan stand column; the fan stand column is connected with the two side stand columns through a supporting structure, the two side stand columns are connected through a supporting structure, each supporting structure comprises a transverse supporting branch pipe, a plurality of inclined supporting pipes and a bottom buoyancy tank, and the inclined supporting pipes are connected between the transverse supporting branch pipes and the bottom buoyancy tanks; heaving cabins are arranged at the bottoms of the fan stand column and the two side stand columns, each bottom buoyancy tank is communicated with the heaving cabins on the two sides, and fixed ballasts are arranged in the heaving cabins at the bottoms of the side stand columns; the overhaul channel is arranged above the position between the draught fan stand column and the side stand columns and above the position between the two side stand columns. The anti-storm effect of the floating platform is greatly improved.

The present invention belongs to the technical field of secondary batteries, and specifically relates to a secondary battery diaphragm coating slurry, and a secondary battery composite diaphragm, and further discloses a preparation method thereof. The secondary battery diaphragm coating slurry of the present invention uses nanocellulose whisker materials with high wettability, high heat resistance and light weight, and high adhesion and low-cost PMMA materials as raw materials, while taking into account the advantages of nanofiber whisker materials and PMMA materials. The secondary battery diaphragm of the present invention forms a modified diaphragm by coating the slurry on the surface of a polyolefin base film, and the 180°C thermal shrinkage and surface density are significantly reduced, and the bonding force is greatly improved, which can improve the safety of the battery, improve the adhesion, and also realize the lightweight design of the battery cell.

The frame type gripper device comprises a connecting plate, a frame is fixedly arranged on the connecting plate, the bottoms of the two sides of the frame are fixedly connected with two transverse rods respectively, and the bottom ends of the two transverse rods are provided with swing arm assemblies used for stably supporting the vehicle body and positioning assemblies used for positioning the vehicle body respectively; the positioning assemblies drive a second type block to rotate around a second rotating shaft through a second swing arm air cylinder, a first positioning pin is driven to be accurately inserted into a vehicle body preset positioning hole, the two symmetrically-arranged positioning assemblies can limit multi-direction displacement of a vehicle body, it is ensured that the grabbing positions are consistent, and the problem that an existing clamp is inaccurate in grabbing is solved. The corbel assembly uniformly bears the weight from the bottom point of the vehicle body, the stress is balanced, and the local stress of the vehicle body is prevented from being too large; the anti-skid lines on the upper surface of the supporting block increase the friction force with the vehicle body, and the stop blocks are matched to limit the swing angle, so that the vehicle body is effectively prevented from sliding due to bumping and steering in the transfer process.

The present invention discloses a vibration mechanism, a receiver and a receiver assembly method. The receiver of the present invention comprises: a shell having an inner cavity formed therein; a sound film mechanism; a vibration mechanism, the vibration mechanism comprising an electromagnet unit and a permanent magnet; the electromagnet and the vibration plate are provided with matching fixing units, and the electromagnet unit and the vibration plate are fixedly connected through the fixing units. In the receiver of the present invention, the connection structure between the armature and the vibration plate is stable, avoiding the problem of sound distortion.

The invention discloses a method for preparing fucoxanthin microcapsules, which belongs to the technical field of food and drug processing, and comprises the following steps: fucoxanthin, carrageenan and protein complex are mixed, and after stirring reaction, fucoxanthin lipid nanoparticles are obtained; microcrystalline cellulose is grafted and modified with succinic anhydride, and then mixed with food-grade chromium picolinate and fucoxanthin lipid nanoparticles to obtain composite fucoxanthin; composite fucoxanthin, propolis extract, white kidney bean extract, pomegranate peel extract, quercetin and tea polyphenols are mixed as core materials, and β-cyclodextrin and gum arabic are used as capsule materials to prepare microcapsules. Fucoxanthin is present in lipid nanoparticles, and the nano size can better adhere to the cell mitochondria to stimulate the mitochondrial effect; the formed microcapsules contain network structures and lipid nanoparticles inside, which can exert a strong force on the composite fucoxanthin and avoid leakage of fucoxanthin in the microcapsules.

The invention discloses a multi-layer structure polyetherimide energy storage composite dielectric film and application thereof, and belongs to the technical field of energy storage dielectric materials and preparation thereof. The invention aims to solve the problems of large high-temperature dielectric loss and poor energy storage performance of the existing polyetherimide-based energy storage composite medium. The multi-layer structure polyetherimide energy storage composite dielectric film is of a three-layer structure and is composed of a scattering electron layer and a capturing electron layer. According to one structure, two surface layers are scattering electron layers, and a middle layer is a capturing electron layer; in the other structure, two surface layers are capture electron layers, and the middle layer is a scattering electron layer; the scattering electron layer is formed by compounding polyetherimide and 4-N, N-dimethylamino phenylboronic acid; and the electron capture layer is formed by compounding polyetherimide and tetrafluoro (4-cyano) quinoline dimethane. The preparation method belongs to an all-organic system, is suitable for large-scale production, and provides a new research and development thought for large-scale production of high-temperature and high-field energy storage all-organic composite films used for a long time.

This invention discloses a high-lubricant-content epoxy resin anti-icing coating material, the components of which include: 3.21~111.3 parts by weight of organic amine, 2.35~36.52 parts by weight of isocyanate, 22.22~591.30 parts by weight of lubricant, 0~27.78 parts by weight of hydrophobic nanoparticles, 100 parts by weight of epoxy resin, 25.71~41.03 parts by weight of curing agent, 0~2.86 parts by weight of accelerator DMP-30, and 59.52~4927.54 parts by weight of organic solvent. This invention also provides a method for preparing the above coating material and its application. The coating material, its preparation method, and its application of this invention solve the problems of poor lubricant binding capacity and low storage capacity of existing anti-icing coating materials through polymer entanglement and urea adsorption, reducing ice adhesion strength to 10-50 kPa, while simultaneously possessing hydrophobicity, mechanical strength, and durability.

This utility model discloses a metering concentric screw valve, including a housing containing a motor; a valve body, with a rotor located at the axial center of the valve body at the output end of the motor. A coupling connects the rotor to the output end of the motor, transmitting the torque generated by the motor output to drive the rotor to rotate. The rotor consists of an integral rod body and rod head, with a double-threaded portion formed on the surface of the rod body. In this utility model, increasing the length of the rotor effectively adjusts the internal spatial layout of the cavity, allowing for smoother flow of adhesive within the cavity and a more uniform pressure distribution, thereby reducing the internal pressure and decreasing the possibility of adhesive leakage due to pressure. Furthermore, the rotor's thread structure is optimized and upgraded, changing the original single-layer thread structure to a double-layer thread structure, which provides a stronger force during rotor rotation.

The utility model provides a kind of oil compensation structure and shock absorber, oil compensation structure includes compensation valve system, shock absorber main body and recovery electromagnetic valve, recovery electromagnetic valve is communicated with the recovery cavity inside shock absorber main body by compensation valve system, compensation valve system includes upper link ring, lower link ring, compensation spring and compensation valve block, one end of upper link ring is connected with recovery electromagnetic valve and is sealed by valve line, other end is sealed with lower link ring and forms cavity, compensation valve block is set on lower link ring, first connecting boss is formed on one side of upper link ring, one end of compensation spring is interference sleeve joint with first connecting boss, other end presses compensation valve block on lower link ring and seals compensation hole, lower link ring is connected with intermediate cylinder by second connecting boss;Optimization to compensation valve system parts structure and installation mode is realized by the oil compensation structure, the stability of oil seal is promoted, and response speed is improved.

The application provides a nanocellulose-based edible preservative liquid, a preparation method and a use method thereof. The nanocellulose-based edible preservative liquid comprises a nanocellulose solution, beeswax and glycerol. The preparation method comprises the following steps: mixing the nanocellulose solution, the beeswax and the glycerol according to a proportion and heating to melt the beeswax to obtain a mixed liquid; then, stirring and emulsifying the mixed liquid to obtain a nanocellulose emulsion; finally, performing vacuum defoaming treatment on the nanocellulose emulsion to obtain the nanocellulose-based edible preservative liquid. The application develops an edible and easy-to-wash preservative liquid based on nanocellulose, adopts a dipping coating mode to perform coating film treatment on fruits and vegetables, forms a micro-nano level preservative coating layer on the surface of the fruits and vegetables, can effectively reduce the loss of water and nutrients on the surface and inside of the fruits and vegetables, reduces the gas permeability of the preservative coating layer, and significantly enhances the mechanical strength of the preservative coating layer.