134results about How to "Guaranteed mechanical properties" patented technology

An electrical connector includes a body having a plurality of terminal holes and a plurality of terminals housed within corresponding terminal holes. The body has an upper surface and a lower surface, with the terminal holes penetrating both surfaces. Each terminal includes a first terminal piece and a second terminal piece, independent of each other. The first terminal piece includes a first fixing portion fixed to the body and a first elastic arm extending upward from the upper surface of the body. The first elastic arm has a chip contact portion and a first overlapping portion extending downward. The second terminal piece includes a second fixing portion fixed to the body and a second overlapping portion extending upward. When the first elastic arm is forced to move downward, it causes the first overlapping portion to move until the first overlapping portion contacts the second overlapping portion, forming a conductive path. The terminal of the present invention is composed of two independent terminal pieces and can form two conductive paths, improving high-frequency performance while ensuring mechanical performance.

The utility model discloses a novel photovoltaic assembly end portion pressing block assembly, comprising an upper portion pressing block and a lower portion pressing block, at least part of the end portion of the upper portion pressing block is contacted with the outer side end face of the top of a purline, and the lower portion pressing block is provided with a first contact portion contacted with the inner side end face of the top of the purline. Connecting holes are formed in the upper pressing block and the lower pressing block, the upper pressing block and the lower pressing block are locked to the top of the purline through connecting bolts, after the upper pressing block and the lower pressing block are locked, the ends, away from the purline, of the upper pressing block and the lower pressing block abut against each other, and a connecting part connected with a photovoltaic module is further arranged on the upper pressing block; different from a traditional photovoltaic module end portion pressing block, the novel photovoltaic module end portion pressing block is additionally provided with the lower pressing block, the photovoltaic module can be clamped on the photovoltaic support purline without forming holes in the photovoltaic support purline again, and the novel photovoltaic module end portion pressing block is particularly suitable for a built module needing to be reinforced.

The application relates to the technical field of zirconium-niobium alloy material processing, in particular to a preparation method of a large-diameter zirconium-niobium alloy pipe for nuclear industry, which comprises the following steps: S1, mixing nuclear-grade sponge zirconium and niobium scraps, or mixing zirconium-niobium alloy, zirconium dioxide and iron; melting the mixture and preparing a zirconium-niobium alloy ingot; S2, sequentially performing large deformation forging in a beta single-phase zone and an alpha+beta two-phase zone; S3, drilling a central hole in the axial direction of a round-forging blank; quenching in the beta single-phase zone; S4, coating an anti-galling agent on the surface of the central hole and heating to prepare a pipe blank in the mode of cross piercing; S5, performing periodic forging and rolling on the pipe blank; S6, annealing the hot-rolled pipe twice; and straightening the hot-rolled pipe after the second-stage annealing. The zirconium-niobium alloy pipe has uniform microstructure, good mechanical properties and corrosion resistance, the production direction of the brittle hydride is nearly parallel to the circumferential direction of the pipe, and brittle damage of the pipe wall thickness caused by the crack propagation of the hydride is avoided.

The invention belongs to the technical field of grinding wheel abrasives, and particularly relates to a diamond porous microsphere, a grinding wheel abrasive and a preparation method and application thereof. The preparation raw materials of the diamond porous microspheres comprise mixed powder, a binder and water, the mixed powder comprises a first ceramic bond, diamond and a pore forming agent. The first ceramic bond, the diamond and the pore forming agent are used as raw materials for preparing the diamond porous microspheres, the diamond porous microspheres have natural pores and prefabricated spherical pores, the porosity is high, and the self-sharpening performance of the grinding wheel grinding material can be improved; the grinding wheel abrasive material is prepared through secondary air degreasing sintering of the diamond porous microspheres, a new three-dimensional pore structure is formed among the naturally stacked diamond porous microspheres, the grinding wheel abrasive material with a'natural pore + prefabricated spherical pore + stacked pore 'multi-stage pore structure is obtained, the cooling, lubricating and chip removal effects of a grinding wheel can be greatly improved, and the service life of the grinding wheel is prolonged. Therefore, the grinding performance and the service life of the grinding wheel are improved.

This invention relates to the field of ultra-high performance concrete (UHVPC) curing technology, and more particularly to an intelligent temperature-controlled curing method for UHVPC. The method includes the following steps: generating preliminary temperature-controlled curing data for concrete based on UHVPC mix proportion parameters and temperature-controlled curing requirements data; analyzing the distributed temperature field characteristics of the pouring nodes using UHVPC pouring node data to generate distributed temperature field characteristic data for the pouring nodes; analyzing the temperature evolution and hydration state of the pouring node temperature field based on the distributed temperature field characteristic data and the preliminary temperature-controlled curing data to generate temperature evolution and hydration regulation state data; and performing dynamic temperature-controlled curing analysis on the preliminary temperature-controlled curing data to generate dynamic temperature-controlled curing data for the concrete. This invention achieves intelligent temperature-controlled curing by combining the application of UHVPC.

This utility model relates to the field of construction, specifically a steel plate connection structure for primary and secondary beams. The secondary steel-concrete composite beams are symmetrically arranged on both sides of the primary steel-concrete composite beam, forming a cross-shaped arrangement. The primary steel-concrete composite beam is horizontally fitted with upper and lower flange connecting plates, corresponding to the heights of the upper and lower pipe walls of the secondary steel-concrete composite beams, respectively. The two end faces of the upper and lower flange connecting plates support the upper and lower pipe walls of the secondary steel-concrete composite beams from bottom to top. This utility model significantly improves the construction efficiency of connecting primary and secondary beams and has a simple structure.

The application belongs to the technical field of waterborne polyurethane preparation, and particularly relates to a solvent-free photocuring polyurethane and a preparation method thereof, which comprises the following steps: 1) mixing 1,6-hexane diisocyanate trimer, hydroxypropyl acrylate and a polymerization inhibitor at 55-65 DEG C, and obtaining a PUA prepolymer after reaction; 2) mixing the PUA prepolymer, epoxy acrylate resin, hydrogenated rosin glyceride, an active diluent mixture containing a photoinitiator, PETMP, a tertiary amine type co-initiator, a silane coupling agent and a polymerization inhibitor, stirring, defoaming, filtering, and obtaining the solvent-free photocuring polyurethane; the application has the advantages of fast curing speed and high storage stability.

The invention belongs to the technical field of freight unmanned aerial vehicle delivery, and relates to an intelligent cabin door system for an unmanned aerial vehicle and a cabin door structure design method. The system comprises a driving system, a reel system, a curtain plate system, a sliding rail unit and a control unit. The control unit is electrically connected with the driving system; the driving system is arranged on the unmanned aerial vehicle body; the curtain plate system is connected with an unmanned aerial vehicle body through the sliding rail unit, the curtain plate system is connected with the reel system, the driving system is in transmission connection with the reel system through a chain wheel transmission structure, and the driving system drives the reel system to rotate so as to drive the curtain plate system to stretch or retract along the sliding rail unit. Opening and closing of the cabin door are realized. According to the invention, the number of moving parts is greatly reduced, the probability of clamping stagnation and wear failure of a mechanical transmission mechanism is fundamentally reduced, and the operation reliability of a cabin door system in harsh operation scenes such as emergency logistics and disaster rescue is remarkably improved.

The present invention relates to a marine biodegradation speed improver for a biodegradable resin. The present invention provides a marine biodegradation speed improver for a biodegradable resin, which contains 16-hydroxyhexadecanoic acid.

The invention provides a low-water-absorption glass bead modified PBT (polybutylene terephthalate) material and a preparation method thereof. The low-water-absorption glass bead modified PBT material comprises the following components in parts by weight: 70-100 parts of PBT resin; 0 to 30 parts of solid glass beads; 0-5 parts of a toughening agent; 0-2 parts of an antioxidant; 0-2 parts of a lubricant; 0-2 parts of black color master batch; 0-2 parts of a coupling agent; 0-5 parts of polytetrafluoroethylene wax; wherein the average particle size of the solid glass beads is 1-50 [mu] m; the average particle size of the polytetrafluoroethylene wax is 3-15 [mu] m, and the weight-average molecular weight of the polytetrafluoroethylene wax is 10000-30000 g / mol; the weight ratio of the solid glass beads to the polytetrafluoroethylene wax is (5-10): 1. According to the invention, the polytetrafluoroethylene wax is added into the solid glass bead modified PBT material, so that the shrinkage difference between the material flow direction and the vertical flow direction is effectively reduced, the water absorption rate of the material is remarkably reduced, the preparation process is simple, and the production process is easy to control.

This invention discloses a direct rolling production method for Q235B carbon structural steel plate. The chemical composition and mass percentage of the Q235B carbon structural steel plate are as follows: C: 0.16-0.19%, Si: 0.10-0.30%, Mn: 0.25-0.40%, P≤0.030%, S≤0.025%, with the balance being Fe and unavoidable residual elements and impurities from the production process. The production method includes continuous casting, billet reheating, rolling, and cooling. The superheat during continuous casting is controlled at 25-40℃, and the specific water content in the secondary cooling zone is controlled at 0.46-0.49 L / kg. The casting speed is controlled at 1.1–1.15 m / min, and the average temperature of the billet exiting the fan-shaped section is controlled between 1170–1220℃. After being cut, the continuously cast billet is conveyed to the steel tapping roller conveyor of the heating furnace without being heated in the heating furnace. The temperature drop during the conveying process is controlled below 2℃ / min. After the billet is sent to the steel tapping roller conveyor of the heating furnace, it enters a heat-replenishing and heat-insulating cover with edge heating function for heat replenishment. The billet temperature at the end of the heat replenishment process is controlled at 1150–1200℃. The carbon structural steel plate of this invention meets the national standards in terms of comprehensive performance, significantly reduces energy consumption costs, and has a simple and efficient process.

The present application relates to the technical field of resin, in particular to a conductive polypropylene composite material and a preparation method thereof.In view of the problems of poor processing fluidity, easy shear damage of conductive network and deterioration of mechanical properties caused by high filling of conductive filler in the prior art, the present application realizes the low volume resistivity, high melt flow rate and excellent mechanical toughness by the solid phase pre-coating technology, and effectively balances the conductivity, processability and strength.

The invention belongs to the technical field of reinforcing steel bar straightening, and discloses a reinforcing steel bar straightening device for civil engineering construction, which comprises a fixed bracket, a driving assembly is arranged at the upper end of one side of the fixed bracket, a striking assembly is fixedly mounted on the top surface of the fixed bracket, and a connecting assembly is arranged on one side of the top surface of the fixed bracket. A straightening assembly is arranged in the middle of the top face of the fixing support, the connecting assembly comprises a rotating unit, and an abutting piece is fixedly installed at the top of the rotating unit. Through cooperation of a limiting ring, a connecting rod and other structures, a moving rod moves towards the position close to the connecting rod, a striking unit rotates, when an abutting piece does not abut against the moving rod, the striking unit continuously swings to impact a second straightening piece, a large amount of energy can be instantly released through impact, scratches and damage to the surface of a reinforcing steel bar are reduced, and the service life of the reinforcing steel bar is prolonged. And the good surface quality of the material is kept, and the effects that the material is not prone to deformation or fracture when stressed, and the fracture risk during fatigue is reduced are achieved.

This invention belongs to the field of composite material processing technology and discloses a trimming actuator, a trimming processing device, and a trimming processing method. The trimming actuator includes a side U-shaped housing, a milling assembly, and a transmission assembly. The main body of the side U-shaped housing extends vertically, and both ends are bent and extended horizontally to form an upper extension and a lower extension, which together form a receiving cavity. In the milling assembly, a first connecting shaft passes through the upper extension and is rotatably connected to it, with its upper end connected to a power spindle and its lower end connected to a first milling cutter. The lower end of a second connecting shaft is rotatably connected to the lower extension, and its upper end is connected to a second milling cutter. The first and second connecting shafts are coaxially arranged, and the first milling cutter is located above the second milling cutter, with their axes collinear. The rotation of the power spindle drives the first connecting shaft and the first milling cutter to rotate synchronously. The transmission assembly transmits the power of the first connecting shaft to the second connecting shaft, realizing the synchronous rotation of the first and second milling cutters and suppressing delamination and burr defects on the trimmed edges of the composite material.

The invention relates to the technical field of batteries, in particular to a composite buffer structure for a battery and a preparation method and application thereof. A composite buffer structure for a battery comprises a polymer matrix layer and a reinforcement phase located in the polymer matrix layer, the reinforcement phase comprises a shape memory alloy fiber layer, and the shape memory alloy fiber layer is of a three-dimensional network structure; and the volume fraction of the shape memory alloy fiber layer in the composite buffer structure for the battery is 10%-60%. According to the composite buffer structure for the battery, the polymer matrix layer serves as a continuous phase, the shape memory alloy fiber layer serves as a reinforcing phase, and the polymer matrix layer and the shape memory alloy fiber layer are mutually staggered in the polymer matrix layer to form a three-dimensional network structure; the shape memory alloy fiber layer with a proper volume fraction is adopted, can actively adapt to the volume change of a battery cell, shows superelasticity at the working temperature of the battery, provides high and stable recovery stress, and is excellent in fatigue resistance, so that long-term stable contact of a battery interface is effectively maintained.

This invention relates to a method for inspecting and controlling the production quality of integral Ti60 titanium alloy bladed disks, belonging to the technical field of manufacturing key materials and components for aero-engines. The method includes processing multiple batches of billets through die forging, solution heat treatment, and aging heat treatment to form integral Ti60 titanium alloy bladed disk forgings; selecting one forging from each batch and dissecting it along its radial axis; cutting microstructure samples of different sizes from at least the blades, rims, spokes, and hub; pre-treating each microstructure sample to prepare the surface to be inspected; and using optical microscopes of different magnifications to perform microstructure testing on each inspection surface and analyze whether the parameter characteristics of β-grains and α-grains are qualified and meet preset conditions. This invention improves the efficiency of Ti60 titanium alloy integral bladed disk production quality.

The invention relates to the technical field of artificial board processing, in particular to a preparation method of green low-toxicity flame-retardant plywood. The method comprises the following steps: S1, green synthesis and step-by-step dipping treatment of a complexing phosphorus-nitrogen flame retardant; s2, preparation of a flame-retardant adhesive and construction of an interface intumescent flame-retardant system; s3, stepped layered assembly and hot press molding; s4, conducting ion regulation and anti-rust treatment; wherein the complexing phosphorus-nitrogen flame retardant in the step S1 takes phosphorus and nitrogen as core flame-retardant elements and is synthesized through a complexing rapid reaction and cross-linking reaction technology, the reaction temperature is 80-100 DEG C, and the reaction time is 30-60 minutes; the mass ratio of the phosphorus-containing metal complex precursor to the nitrogen source compound to the chitosan to the catalytic substance is (2-3): (5-6): (1-3): (0.5-1). According to the flame-retardant plywood prepared through the method, the combustion rate growth index is smaller than 100 W / s, the 600-s total heat release amount is smaller than 7.0 MJ, the smoke generation rate index of the smoke generation characteristic is smaller than or equal to 30 m / s, the 600-s total smoke generation amount is smaller than or equal to 50 m, and multiple technical defects of traditional flame-retardant plywood are overcome.

The application discloses a low-temperature ion nitriding method and application. The low-temperature ion nitriding method comprises the following steps: under a selected temperature condition, ion etching treatment is performed on the surface of a workpiece by adopting an arc-enhanced glow discharge process, and then plasma nitriding treatment is performed on the workpiece by adopting an arc-enhanced plasma process to obtain a nitriding workpiece; wherein, a positive and negative alternating voltage is applied to the workpiece in the arc-enhanced plasma process. The low-temperature ion nitriding method provided by the application can realize nitriding at a lower temperature, effectively improves the deformation degree of the workpiece, and is widely applicable to surface strengthening of cutters, molds and metal parts.

The invention discloses a foundation top surface frost heaving crack treatment device and a foundation top surface detection and repair method.The inhibition structure comprises multiple layers of annular units distributed in the longitudinal direction of a concrete body, and each layer of annular unit is provided with multiple annular pipes distributed in a concentric circle array; all the annular pipes in the same layer of annular units are communicated with one another through first communicating pipes, and every two adjacent layers of annular units are communicated with one another through second communicating pipes. The detecting and repairing method comprises the steps that after a restraining structure is arranged and formed, concrete is poured, so that the concrete wraps the restraining structure, and a concrete body is obtained; a through hole penetrating into the restraining structure is formed in the surface of the concrete body; and pressure data in the inhibition structure is obtained, a hydrophobic material is poured into the inhibition structure after it is determined that cracks exist in the inhibition structure, and the cracks in the inhibition structure are repaired through the hydrophobic material. According to the invention, crack development inhibition and rapid crack repair of the top surface of the power transmission tower foundation in a high cold environment are realized.

The utility model relates to the cable field, and especially relates to a multichannel isolation shielding cable comprising a cable core, a composite shielding layer, a filling layer and a protection layer, the composite shielding layer wraps the cable core, and the filling layer is filled between the composite shielding layer and the protection layer; the composite shielding layer comprises an inner shielding layer, an insulating layer and a shielding tape layer, the inner shielding layer wraps the outer side of the cable core, the insulating layer wraps the outer side of the inner shielding layer, the shielding tape layer wraps the insulating layer, and a bonding layer is arranged on the side, making contact with the insulating layer, of the shielding tape layer. According to the utility model, near-field coupling and frequency band cross interference among the wire cores can be effectively reduced, and the anti-interference capability of the cable is significantly improved.

The invention provides a polyacrylonitrile precursor, a carbon fiber and a preparation method thereof. The preparation method of the polyacrylonitrile precursor adopts wet spinning and comprises the steps of coagulating bath and hot water drafting, the hot water drafting at least comprises three times of hot water drafting, the swelling degree of the fiber after the second time of hot water drafting is 110-155%, and the total drafting multiplying power of the hot water drafting is 1.5-6.5 times. The modulus of the polyacrylonitrile precursor is 130 to 160 cN / dtex; the breaking strength of the polyacrylonitrile precursor is 5.80 cN / dtex to 6.50 cN / dtex; the average number of broken filaments per 10000 meters of the polyacrylonitrile precursor is not more than 15; the dispersion coefficient of the fineness of the polyacrylonitrile precursor is 3-5. The invention has the advantages of oil demulsification, less deterioration, high mechanical properties of the precursor, small fineness dispersion coefficient, and less broken filaments and broken filaments in a graphitization furnace.

The application discloses an anti-erosion auxiliary gel material and a preparation method and application thereof. The preparation method of the anti-erosion auxiliary gel material comprises the following steps: 1) mixing regenerated red brick powder with a particle size of 3-10 microns, waste concrete regenerated micro powder with a particle size of less than 10 microns and water to perform a pre-hydration reaction, and then separating a solid product to obtain pre-hydration regenerated powder; 2) calcining the pre-hydration regenerated powder, and then rapidly cooling to room temperature and performing grinding to obtain active regenerated powder; and 3) uniformly mixing the regenerated red brick powder with a particle size of less than 3 microns and the active regenerated powder to obtain the anti-erosion auxiliary gel material. The anti-erosion auxiliary gel material can be added in a large amount in concrete, can effectively improve the anti-Cl ‑ erosion performance of the concrete, does not affect the mechanical properties of the concrete, and is suitable for large-scale industrialized production and application.

The application discloses a kind of based on gray scale control 3D printing appliance step-by-step solidification method.The method includes: the light-sensitive resin used is prepared, and the light-sensitive resin includes epoxy acrylate component, a certain amount of thermal initiator is added in the light-sensitive resin;The region corresponding to the specified tooth is segmented from the 3D printing model of appliance, and the pattern gray scale of the region corresponding to the specified tooth is modified;The 3D printing model of appliance is sliced, and a plurality of slice patterns with gray scale processing are obtained;Based on a plurality of slice patterns, the gray scale photocuring treatment of each layer of appliance is completed;The appliance after gray scale photocuring treatment is placed in oven to heat for specified time at specified temperature.The application is based on gray scale control, uses photocuring, thermal curing step-by-step solidification scheme in the process of 3D printing appliance, reduces the internal monomer amount while guaranteeing the mechanical property of 3D printing appliance, can effectively reduce the precipitation of monomer, and improve biocompatibility.

The Z-axis coaxiality decoupling assembly of the 3D printer comprises an upper plate, a middle plate and a lower plate which are arranged in a stacked mode from top to bottom, first sliding structures are installed between the upper plate and the middle plate at intervals, and second sliding structures are installed between the middle plate and the lower plate at intervals; the sliding direction of the first sliding structure and the sliding direction of the second sliding structure are both horizontally arranged and perpendicular to each other. Therefore, movement interference in the X-axis direction and the Y-axis direction is effectively decoupled through the first sliding structure and the second sliding structure which are horizontally arranged, extra force and moment generated by the coaxiality problem are solved, extra vibration or noise is reduced or even avoided, abrasion is reduced, stable Z-axis movement is guaranteed, the service life of the mechanism is prolonged, and the printing quality is guaranteed.

This application discloses a composite photovoltaic ribbon and a photovoltaic module. The ribbon includes a ribbon substrate, which comprises an aluminum layer and a copper layer. The copper layer includes a first copper layer disposed on at least a portion of the outer peripheral surface of the aluminum layer. The mass ratio of the copper layer to the aluminum layer is 1:9 to 9:1, and the thickness of the first copper layer is greater than or equal to 2 μm. This application differs from the prior art in that it uses only copper as the ribbon substrate by adding an aluminum layer, reducing the amount of copper used and lowering the cost of the ribbon substrate. Furthermore, by limiting the mass ratio of the copper layer to the aluminum layer and the thickness of the copper layer, the electrical conductivity and mechanical properties of the ribbon substrate are ensured to meet requirements.

The utility model discloses a novel protection layer structure of a prefabricated vertical component, which relates to the field of concrete structure construction, the cross section of the structure is a component main body of a rectangular cylinder, a main framework support is arranged in the component main body, a groove is arranged on the side surface for accommodating a transverse steel bar, a curved surface reed is arranged at the opening of the groove, and U-shaped hooks inclined inwards are arranged at the two ends of the component main body. Materials of the main framework are selected according to the thickness of a vertical component, and a component body is filled with fine aggregate concrete or high-strength mortar. The working mechanism is as follows: firstly prefabricating the tire membrane, installing the main framework and the hook during cast-in-place, and pouring the filler. The structure can effectively avoid many defects caused by the fact that the protective layer is too thick or too thin, and compared with the prior art, the structure has the remarkable beneficial effects of guaranteeing structural stability, preventing steel bar corrosion, improving construction quality and structural performance and the like.

A kind of UHPFRC combined steel bridge deck panel using burl cold connection key, comprising the following construction steps: S1, prefabricated cold connection key;S2, using high-pressure air gun to carry out dust removal, cleaning to steel bridge deck top plate;S3, set cold connection key on steel bridge deck top plate, the longitudinal distance between adjacent cold connection key is 30-50cm, the transverse distance is 30-50cm;S4, pours the layer of ultra-high performance cement-based composite material on steel bridge deck top plate and cold connection key;The combined steel bridge deck panel of the application is simple in structure, and the force is clear, burl cold connection key is used in steel-mix combined structure, increases the contact area of connection key and concrete, can significantly reduce the stress concentration between connection key and concrete, while connection key has 360 degrees universal shear resistance, and shear resistance adaptability is good, and has good tensile performance, reliable connection and other advantages, is used with copolymerized formaldehyde fiber or hybrid fiber UHPFRC, can significantly improve the combined stiffness of combined structure, improves the fatigue performance of steel bridge deck panel.

The invention provides a tape casting method high-transparency polysulfonamide film as well as a preparation method and application thereof. The light transmittance of the high-transparency polysulfonamide film obtained through the tape casting method is larger than or equal to 80% (400-800 nm), and the dimensional change rate at 250 DEG C is smaller than or equal to 1%. The preparation method comprises the following steps: S1, pretreatment of the polysulfonamide fibers: soaking and purifying the polysulfonamide fibers in acetone; then stirring and alkalizing in an alkaline solution; removing the alkaline solution and drying to obtain pretreated polysulfonamide fibers; s2, preparation of a membrane casting solution: dissolving the pretreated polysulfonamide fiber in a solvent to prepare a polymer solution; then adding a salt cosolvent and a polymeric dispersant to prepare a mixed solution, and stirring, filtering and carrying out vacuum defoaming to obtain a membrane casting solution; s3, film forming through a tape casting method, wherein the film casting solution is placed on a substrate, and a wet film is prepared through scraper tape casting; s4, coagulating bath phase inversion: transferring the wet film into a coagulating bath, and coagulating to form a preliminarily shaped film material; and S5, post-treatment: washing the preliminarily shaped membrane material with water, and carrying out gradient drying to obtain the high-transparency polysulfonamide membrane.

This utility model discloses a steel bar straightening mechanism, including a straightening mechanism and a feeding tray for placing the steel bar coil. The feeding tray is equipped with a limiting cylinder. Before entering the straightening mechanism, the steel bar is bent in the opposite direction by the limiting cylinder. An mounting plate is provided on the side of the feeding tray, and a movable plate is slidably mounted on the mounting plate. A screw pair is provided at the bottom of the movable plate, and a self-locking screw is rotatably mounted in the through groove in the middle of the movable plate. The self-locking screw is installed in cooperation with the screw pair. The limiting cylinder is rotatably mounted on the movable plate through a mounting shaft. The steel bar will not twist before straightening, ensuring the mechanical properties of the steel bar. Moreover, the initial reverse bending of the coiled steel bar before straightening significantly reduces the curvature of the steel bar. Subsequent straightening will not cause cracking, reducing the deformation of the steel bar during straightening and thus improving the straightening efficiency.

A titanium alloy product surface treatment device belongs to the technical field of titanium alloy product surface repair, which comprises a base, a supporting frame is fixedly installed on the upper surface of the base, a polishing mechanism capable of adjusting polishing height is arranged in the supporting frame, a T-shaped feeding table is transversely and slidably installed on the upper surface of the base, two directional rods are fixedly installed on the upper surface of the T-shaped feeding table, a supporting table is interactively installed between the other directional rods, a compression spring is fixedly installed between the right surface of the supporting table and the right upper end of the T-shaped feeding table, a driving mechanism is installed on the left side of the T-shaped feeding table, an adaptive carrier mold is detachably installed on the upper surface of the supporting table, and a carrier groove lower than the thickness of the carrier is arranged on the upper surface of the adaptive carrier mold. The single contact mode of the prior art linear stable feeding is changed, the contact points of the workpiece and the polishing mechanism are dynamically switched, the polishing pressure is uniformly dispersed to the whole surface to be treated, and the problem of local concentration of the polishing pressure of the existing device is effectively solved.