1217 results about "Metal mesh" patented technology

The invention relates to a coal seam extraction drilling air bag type memory metal net cover hole collapse prevention device and method, the device comprises an I-type air bag net cover installation unit body, a plurality of II-type air bag net cover installation unit bodies and an inflator pump, an exhaust pipeline is provided with an exhaust control valve, a hole wall is supported through a memory metal net cover, and the air bag net cover installation unit body and the inflator pump are arranged in the hole wall; the memory metal net sleeves can be matched with drill holes with different hole diameters in a self-adaptive mode and can be repeatedly used, the configuration number of the memory metal net sleeves can be greatly reduced, and therefore the processing cost of hole collapse prevention is further reduced; the installation of the memory metal net sleeve is directly controlled by the expansion of the air bag, so that the memory metal net sleeve can be quickly unfolded and reliably contacted with the hole wall; the removal of the memory metal net sleeve is directly controlled by temperature control gas, so that the memory metal net sleeve retracts to an initial state at the recovery temperature and is separated from the hole wall; the mounting and dismounting process of the memory metal net cover has the advantages of being simple, efficient and easy to operate, and the construction efficiency can be further improved.

Systems, assemblies, apparatuses, and methods herein may provide an enhanced fluid seal between two components. A seal to enhance a fluid seal between a surface of a first component of a pump and a surface of a second component of the pump may include an annular seal body having a seal body surface and a seal cross-section at least partially defined by the seal body surface. The annular seal body may include a metal mesh, thereby to enhance thermal conductivity between the seal and one or more of the first component or the second component, so as to transfer heat from the seal to one or more of the first component or the second component, thereby to reduce a temperature of the seal and extend a service life of the seal.

The invention discloses an energy storage battery box based on light high-performance concrete and a preparation method of the energy storage battery box, and belongs to the technical field of energy storage equipment. The energy storage battery box provided by the invention comprises a light high-performance concrete base body and a metal net embedded in the light high-performance concrete base body, according to the lightweight high-performance concrete matrix, a multi-component gel system composed of ordinary Portland cement, a shrinkage reducing agent, a solid waste-based geopolymer and steel slag micro powder is adopted, and solid waste-based artificial sand, fibers and a solid waste-based filling material in a specific proportion are compounded, so that a lightweight high-strength intrinsically fireproof concrete material is successfully prepared; meanwhile, a large amount of industrial solid wastes such as the desulfurized gypsum, the red mud, the steel slag tailings and the fly ash are utilized, efficient resource utilization is achieved, the raw material cost and full-life-cycle carbon emission are remarkably reduced, and the production efficiency is high.

The invention relates to the technical field of metal net welding, in particular to a welding control method and system for the metal net production process, and the method specifically comprises the steps that firstly, functional areas are divided based on the geometric structure of a metal net, temperature changes in thermal imaging images of all the functional areas are analyzed in real time, and weights of different areas are defined; environmental parameters and equipment state data are collected in real time through multiple types of sensors, and comprehensive deviation of materials, environments and equipment at all moments is calculated in combination with material characteristic parameters; adjusting the proportion parameter of each functional area at each moment based on the weight and the comprehensive deviation, and dynamically adjusting the welding power of each functional area at each moment in combination with a self-adaptive PID (Proportion Integration Differentiation) algorithm; the problems that under traditional unified parameter control, the weld quality is not uniform, and the production line rhythm and energy consumption cannot be considered at the same time are solved, and the production efficiency is improved while the welding quality is guaranteed.

The invention relates to the technical field of flexible transparent electrodes, in particular to a Cu / Al laminated metal grid flexible transparent electrode and a preparation method thereof. The Cu / Al laminated metal grid flexible transparent electrode comprises a flexible substrate, a copper layer arranged on the flexible substrate and an aluminum layer arranged on the copper layer, and the aluminum layer located on the outer layer spontaneously forms an Al2O3 passivation layer with the thickness of 2-5 nm in air. The Al2O3 passivation layer can effectively prevent oxygen and moisture from permeating inwards, so that oxidation of the copper layer in a humid or high-temperature environment is fundamentally inhibited, long-term stability of the electrical property of the electrode is ensured, and meanwhile, due to the fact that the thickness of the copper layer is 150-250 nm, excellent conductivity is provided, and low square resistance is achieved; the latticed structure maintains high light transmittance of the electrode while ensuring a high conductive path. Finally, the structure has excellent oxidation resistance, high light transmittance, low sheet resistance and flexible stability under the support of a flexible transparent substrate with the thickness of 50-200 [mu] m, and meets the harsh requirements of a new generation of flexible optoelectronic devices on electrode performance.

A downspout guard having opposed sidewalls and opposed end walls connected to a top wall, all formed from mesh material, such as metal mesh. Bottom edges of the walls engage a gutter bottom wall to hold the guard in place and forcing water to flow through the guard before entering the downspout. The sidewalls can engage gutter front / back walls, further holding the guard in place. Trapped debris enhances further debris entrapment, even trapping particles smaller than the mesh opening. Optionally, end walls taller than the sidewalls to accommodate obstructions and allow height adjustment by relative angle changes.

The application discloses a bottle-shaped sound-electricity conversion power generation device, which comprises a shell, a PVDF film, a metal net and a piezoelectric component.

The present application relates to the technical field of contaminated soil cleaning, and particularly relates to a cleaning equipment for treating soil pollution, which comprises a base plate, a containing box is fixed on the top of the base plate, a metal mesh bag is fixed in communication at the bottom of the containing box, squeezing mechanisms are arranged around the metal mesh bag, the squeezing mechanism comprises a lead screw, an L-shaped rod one is in screw transmission on the outside of the lead screw, and a squeezing plate is fixed at one end of the L-shaped rod one. In the present application, the contaminated soil is contained by using the metal mesh bag, the two squeezing plates arranged relatively around the metal mesh bag can successively and staggeredly squeeze the soil, which is convenient for crushing the contaminated soil, makes the soil fully contact with the leaching agent for purification, and also facilitates fully crushing the soil to make it fall to the bottom of the chemical solution tank through the mesh holes of the metal mesh bag, the impurities such as plastics, stones and packaging bags which are not easy to be squeezed and crushed are left in the metal mesh bag, and the impurities in the contaminated soil are cleaned out.

The invention provides a preparation method of a Joule heat-assisted super-wetting metal net, a metal net with super-hydrophilic performance and a metal net with super-hydrophobic performance. According to the material, carbon nanotubes are firmly adhered to the surface of a metal net through polydopamine mediation to construct a micro-nano coarse structure, a hydrophobic alkyl compound is grafted through a sulfenyl three-component coupling reaction to reduce surface energy, and a super-hydrophilic / underwater super-oleophobic metal net and a super-hydrophobic metal net are prepared respectively. The Joule heating effect of the material is remarkably enhanced by introducing the carbon nanotubes, so that the temperature of the material can be rapidly increased to 100 DEG C or above within 20 seconds under the ultralow voltage of 2.0 V. The characteristic can be effectively used for in-situ heating viscosity reduction of high-viscosity crude oil, continuous and efficient oil-water separation is achieved in a double-channel separation device, the crude oil flux reaches up to about 3985 L.m <-2 >. H <-1 >, and the separation efficiency exceeds 98.6%. The method is also suitable for stainless steel meshes with micron-sized apertures, and can realize efficient separation of various crude oil emulsions.

The invention discloses a reinforced photoelectric composite cable of a coal mining machine, which belongs to the technical field of cables, and comprises a composite cable core structure, an armored protective layer and a sheath system, and the armored protective layer comprises a first steel belt, a second steel belt and a metal net braid layer, a third steel belt which is continuously bent to be of a wave structure is arranged in a cavity formed by the first steel belt and the second steel belt, the wave troughs of the third steel belt make contact with the inner wall of the first steel belt, and the wave crests of the third steel belt make contact with the inner wall of the second steel belt. The cable can be subjected to multi-dimensional mechanical property collaborative optimization under complex working conditions, the purpose of graded unloading is achieved through deformation of the steel plate, the situation that a traditional structure generally depends on rigid resistance of an armor layer is not needed, the flexibility is considered while the mechanical property is guaranteed, and the cable adapts to frequent bending scenes; and the long-term stable operation of the cable in a severe mine environment is further ensured.

The invention discloses a metal grid transparent conductive film which sequentially comprises a transparent base material layer, a metal grid layer, a transition layer and a protection layer from bottom to top. The manufacturing method comprises the steps of pretreating the transparent base material, preparing the metal seed layer, performing laser direct writing patterning, performing electroplating thickening to form the metal grid layer, preparing the transition layer and the protective layer, and performing performance test and adjustment. The hexagonal honeycomb grid structure and the arc edge design are adopted, and the problem of metal grid electric field concentration is effectively solved; through the arrangement of the transition layer, the interface bonding force of the metal grid is improved; the protection layer and the transition layer cooperate to improve the corrosion resistance of the film; the problems that an existing transparent conductive material is high in cost, poor in flexibility and insufficient in interface compatibility, and an electrochromic device is concentrated in electric field, short in service life and the like are effectively solved, and the transparent conductive material can be widely applied to building intelligent windows, automobile anti-dazzle rearview mirrors, flexible display panels and other electrochromic devices and has important industrial application value.

The invention relates to the technical field of printing screens, in particular to a pure opening printing screen and a manufacturing method thereof.The manufacturing method of the pure opening printing screen comprises the steps that a polyethylene film and metal mesh cloth are sequentially attached to a polyester mesh, the metal mesh cloth and the polyester mesh are tightly attached together in a hot pressing mode, and composite mesh cloth is formed; the designed processing drawing is guided into a laser machine, and a yarn removing area, a yarn removing path and a yarn removing sequence are set; starting a yarn removing program of the laser machine, completely removing steel wires in the X-axis direction and the Y-axis direction of the yarn removing area of the composite screen cloth, and forming a hollow opening in the yarn removing area of the composite screen cloth; carrying out plate making by adopting the composite screen cloth which is qualified after the product inspection to obtain a pure opening printing screen plate; according to the manufactured pure-opening printing screen, the printing screen can achieve the effect that no steel wire blocks an ink discharging channel in a required effective area, and the situation that the steel wire influences the printability and the printing effect of an ink penetrating area is avoided.

This invention discloses a surface-mount solid aluminum electrolytic capacitor and its manufacturing method, comprising a capacitor core package, which includes N capacitor cores, N+1 conductive metal meshes, a substrate, anode leads, cathode leads, and a silver paste covering tape. The capacitor core package is encapsulated and electroplated to form a solid aluminum electrolytic capacitor. The capacitor core includes an anode portion, a cathode portion, and an insulating barrier tape. In this invention, the conductive metal mesh sandwiched between the metal pads in the anode portion of the capacitor core and the cathode portion of the capacitor core can achieve the flatness of the core package. The silver paste covering tape located on the side of the cathode portion of the core package is embedded in the gap formed between two adjacent capacitor cores due to the conductive metal mesh sandwiched, forming an integrated connection. This prevents the resin encapsulant from being squeezed into the core layers during encapsulation, preventing core deformation damage that could lead to increased leakage current and increased ESR. Furthermore, it can prevent insufficient capacitance or even capacitor failure caused by delamination between cores.

The utility model discloses a flexible insulating low-voltage cable, which comprises an outer sheath, a first fireproof layer fixedly connected to the inner wall of the outer sheath, a first antistatic layer fixedly connected to the inner wall of the first fireproof layer, a plurality of cable cores annularly arranged in the middle of the outer sheath, a metal net fixedly connected to the outer walls of the plurality of cable cores, and a second antistatic layer fixedly connected to the inner wall of the metal net. A second anti-static layer is fixedly connected to the outer wall of the metal net, a second fireproof layer is fixedly connected to the outer wall of the second anti-static layer, a first flexible rod is installed in the middle of the outer sheath, and a plurality of second flexible rods are annularly installed on the outer side of the first flexible rod. Through the above structure, the cable core can be better protected, the cable core is not damaged when the outer sheath of the cable is on fire, and after the cable is bent, the cable is supported by the first flexible rod and the second flexible rod, so that the cable core can be prevented from being deformed.

The utility model relates to a double-spliced showing stand, and relates to the technical field of showing stands, the double-spliced showing stand comprises a metal plate, first composite plates are fixedly arranged on the two sides of the metal plate in the width direction, a second composite plate is fixedly arranged on one side of the metal plate in the length direction, and each first composite plate comprises a first acrylic plate; the first composite plate comprises a first acrylic plate, first metal net plates are fixedly arranged on the two sides of the first acrylic plate, the second composite plate comprises a second acrylic plate, and a second metal net plate is fixedly arranged on the side, away from the metal plate, of the second acrylic plate. By reasonably designing the composite material structure, high strength, high stability and good light transmission of the showing stand are achieved, meanwhile, the weight of the showing stand is reduced, and convenience of installation and use is improved.

The invention discloses an anti-torsion cross-linked polyethylene insulated power cable applied to the field of cables, which comprises a petal framework composite structure comprising hollow strips, a main support layer and a buffer layer, and an outer layer protection structure formed by branch protection rings and an elastic metal net. The problems that in the prior art, a cable is prone to structural damage and performance degradation under the torsion working condition are solved, a main supporting layer in a petal framework disperses torsion stress through deformation, a buffer layer absorbs impact energy, a hollow supporting layer provides structural rigidity, and the main supporting layer, the buffer layer and the hollow supporting layer form an elastic supporting-buffer energy absorption-rigid stability synergistic system; therefore, the cable with the petal framework composite structure has excellent torsion resistance. And meanwhile, dynamic heat dissipation and temperature regulation and control are realized through fluid circulation of the hollow supporting layer and the sensing array, and the structural integrity and transmission stability of the wire core under complex working conditions are guaranteed.

The present disclosure discloses a speaker box including: a housing and a speaker, including: a frame; a vibration system, including: a diaphragm; and a coil; a magnet system, including: a main yoke; a main magnet; and an elastic support member, including: a bottom wall surrounding the main yoke; and a side wall; a metal mesh cover surrounding the elastic support member and fixedly connected to the frame; an inner chamber is enclosed by the frame, the main yoke, the elastic support member and the diaphragm; a back chamber isolated from the inner chamber is enclosed by the main yoke, the elastic support member, the metal mesh cover and the housing; a plurality of air vents provided on the metal mesh cover is configured to connect the back chamber with the inner chamber. The speaker box in the present disclosure has higher reliability and higher sound quality.

The invention discloses an HJT solar cell based on a metal grid copper electrode, which comprises an N-type monocrystalline silicon substrate, the front surface and the back surface of the N-type monocrystalline silicon substrate are respectively textured, an I-type amorphous silicon layer and a P-type amorphous silicon layer are sequentially laminated on the front surface of the N-type monocrystalline silicon substrate, and an I-type amorphous silicon layer and an N-type amorphous silicon layer are sequentially laminated on the back surface of the N-type monocrystalline silicon substrate; the surface of the P-type amorphous silicon layer and the surface of the N-type amorphous silicon layer are both covered with transparent conductive oxide layers, the transparent conductive oxide layers are coated with transparent conductive colloid layers, the transparent conductive colloid layers comprise transparent resin binders and conductive substances dispersed in the transparent resin binders, and metal grid copper electrodes are arranged on the transparent conductive colloid layers; through precise design of the line width and the spacing of the metal grid copper electrode, the shading rate can be reduced to the maximum extent while low square resistance and efficient current collection can be ensured, and the requirements of scenes such as building integrated photovoltaic and the like for high-light-transmittance and low-resistance electrodes are met.

This invention relates to a heating device for a multi-layer, multi-cavity laminator, the lamination machine itself, and a lamination method. The heating device includes a first heating unit, a second heating unit, and a third heating unit connected by an electrically controlled telescopic mechanism. The first heating unit includes a first elastic metal mesh with multiple first heat-conducting pipes embedded inside. A top heat insulation plate is laid on the upper surface of the first elastic metal mesh, and a first lamination plate is laid on the lower surface. The second heating unit includes a second elastic metal mesh with multiple second heat-conducting pipes embedded inside. Both the upper and lower surfaces of the second elastic metal mesh are laid with second lamination plates. The third heating unit includes a third elastic metal mesh with multiple third heat-conducting pipes embedded inside. A third lamination plate is laid on the upper surface of the third elastic metal mesh, and a bottom heat insulation plate is laid on the lower surface. This invention addresses the problems of photovoltaic module crushing and uneven heating.

The invention discloses a modularized low-temperature plasma logistics fresh-keeping device and method, and the device comprises at least one low-temperature plasma discharge module which comprises an insulating fixed frame, and a metal mesh electrode and at least one point discharge electrode which are fixed on the insulating fixed frame, the point discharge electrode is provided with a cylindrical side wall, the axis of the point discharge electrode is perpendicular to the metal mesh electrode, a plurality of conductive points are uniformly distributed at the end, facing the metal mesh electrode, of the cylindrical side wall, and a certain distance is reserved between the conductive points and the metal mesh electrode; the pulse direct-current high-voltage module is used for outputting high-voltage pulses to the low-temperature plasma discharge module; the infinite loop on-off module is used for periodically controlling on-off of the pulse direct-current high-voltage module; and the low-voltage direct-current power supply provides low-voltage direct current for the pulse direct-current high-voltage module and the infinite loop on-off module. The fresh-keeping device adopts a discharge mode which is simple in structure, high in energy density and easy to modularly integrate, and can be integrated in a logistics transportation system for fresh keeping of fruits and vegetables.

The utility model belongs to the technical field of tail gas treatment, and particularly relates to an exhaust noise reduction structure and a vehicle, the exhaust noise reduction structure comprises a first noise reduction structure and a second noise reduction structure, the first noise reduction structure comprises a shell and a metal net, the metal net is arranged in the shell, and the periphery of the metal net is connected with the inner wall of the shell; the second silencing structure is connected to the air outlet end of the first silencing structure. By using the exhaust noise reduction structure in the technical scheme, the exhaust noise level is controlled and the low-noise design of the post-treatment is realized while the post-treatment is ensured to meet the emission regulation, so that the NVH (Noise Vibration and Harshness) performance of the whole vehicle is improved.

The utility model provides a storage cage processing and cutting device, which relates to the technical field of storage cage processing and comprises two support rods, the two support rods are fixedly mounted on the surface of one side of a worktable, a bearing plate is fixedly mounted on the surface of one end, far away from the worktable, of each support rod, and a chute is formed in the surface of each bearing plate. A sliding groove is formed in the workbench, a vertical plate is slidably connected into the sliding groove, a first motor is fixedly installed on the surface of the vertical plate, a rotating shaft is fixedly installed at the output end of the first motor, a through groove is formed in the surface of one side of the workbench, and the end, away from the first motor, of the rotating shaft penetrates through the through groove and is fixedly provided with a cutting knife. The metal mesh wire is placed on the surface of the workbench, the part needing to be cut is placed above the cutting groove, and the cutting knife is located on the rightmost side of the cutting groove, so that when the metal mesh wire needs to be cut, the cutting knife needs to move transversely, and the safety of workers can be guaranteed when the metal mesh wire is placed.

The invention belongs to the technical field of net mold frames for hollow internal mold metal net cement partition walls, and discloses a net mold frame for a hollow internal mold metal net cement partition wall and a method for building the hollow internal mold metal net cement partition wall. The main technical characteristics are as follows: two opposite wave-shaped meshes are included, wave troughs of the two meshes are attached together, wave crests of the two meshes are opposite, a cavity is formed between the wave crests of the two meshes, vertical keels are arranged in the cavity, the vertical keels are bound and fixed with the meshes, and the vertical keels are arranged in the cavity. Vertical supporting frames are arranged at the wave trough positions of the two meshes, and the vertical supporting frames are fixed to the meshes. The upper embedded steel bars and the lower embedded steel bars are connected together through the vertical supporting frames, the vertical supporting frames are arranged at intervals, and the anti-collision performance and the anti-seismic performance of the wall are greatly improved.

The invention provides a double-layer packer for coal mine hydraulic fracturing and a testing method thereof, and the double-layer packer comprises a central inner pipe which is through in the axial direction and is provided with at least one water through hole which is through in the radial direction of the central inner pipe; the central inner pipe is sleeved with the first elastic cylinder, a first expansion cavity is formed in the outer side of the central inner pipe, and the water through hole is located in the first expansion cavity; and the second elastic cylinder is arranged on the center inner pipe in a sleeving mode, a second expansion cavity is formed in the outer side of the center inner pipe, the first expansion cavity is located in the second expansion cavity, and a metal net is arranged on a cylinder body of the second elastic cylinder. According to the double-layer packer for coal mine hydraulic fracturing and the testing method of the double-layer packer, the success rate of hole sealing and pressure maintaining can be guaranteed, the construction efficiency is improved, and the fracturing engineering material cost is effectively reduced.

The utility model discloses an end bending device for a support metal net, which belongs to the technical field of support metal net manufacturing and comprises a bottom frame and an operation table. Fourth belt wheels are rotationally mounted on two sides of one end of the operation table through mounting cylinders; a limiting pressing rod is arranged in the mounting cylinder in a sliding and penetrating mode, and a pressing roller is connected between the two fourth belt wheels and arranged at the eccentric positions of the fourth belt wheels. The device further comprises a power mechanism. During use, the end of a to-be-bent metal net is placed at the front end of the operation table and located on the upper side of the pressing roller, the limiting pressing rod penetrates into the mounting cylinder, and the end of the to-be-bent metal net is located on the lower side of the limiting pressing rod; the two fourth belt wheels are driven by the power mechanism to rotate synchronously to drive the pressing roller to turn upwards and rotate, so that the end part of the metal net can be bent conveniently and efficiently; and after bending is completed, the limiting pressing rod is pulled out, and reversing or replacement of the metal net is achieved. The whole structure is simple, the end of the metal net is bent conveniently and efficiently, the labor intensity is effectively reduced, and practicability is good.

This invention discloses a high-gain vehicle-mounted optically transparent antenna with improved radiation pattern, operating in the 0.74-0.87 GHz range. The invention includes a substrate, an antenna body, and a system ground plane. The substrate comprises a PET film layer, an OCA adhesive layer, and a PC dielectric substrate. The antenna body consists of two trapezoidal radiating patches, a reverse cancellation strip, a feed line, and a system ground plane located on the same layer as the antenna. The two trapezoidal radiating patches are connected by the reverse cancellation strip, which links their longer base edges. Its transparency is primarily achieved through the use of a transparent substrate material and a metal mesh structure composed of thin and fine metal wires. The cascaded trapezoidal radiating patches and the connected reverse radiation strip achieve performance improvements such as high gain, wide bandwidth, and improved horizontal radiation pattern nulls. This invention can achieve optical transparency of over 70%, radiation efficiency of over 65%, and radiation pattern null improvement of over 3 dB in the operating frequency band.

The present invention provides a cover device that can improve the comfort experienced by passengers inside the elevator car while the fan is operating. [Solution] The cover device is a device that covers a part of a blower installed at the top of an elevator car to send air into the elevator car, and comprises a mesh body having a metal mesh and a cooler attached to the mesh body to cool the mesh body, and the mesh body is attached to the blower such that the mesh portion of the mesh body covers the air supply area, which is the surface that the blower draws in air from the elevator shaft.

The application provides a metal mesh reinforced primary efficiency filter device, and relates to the technical field of air filtration.The metal mesh reinforced primary efficiency filter device comprises a filter square tube, an air inlet square tube and a self-cleaning square tube, the filter square tube is connected with the air inlet square tube, the self-cleaning square tube is fixedly provided with a connecting square tube and a first air outlet square tube on both sides, and the connecting square tube is connected with the filter square tube;an airflow uniformizing plate is fixedly arranged in the air inlet square tube, a plurality of flow guide holes are formed in the airflow uniformizing plate, the diameters of the flow guide holes gradually decrease from the air inlet side to the air outlet side, the axes of the flow guide holes and the plate surface of the airflow uniformizing plate form an included angle of 15-25 DEG, three filter frames are arranged in the filter square tube, and the top of each filter frame extends to the upper side of the filter square tube.The application has the advantages of high filtration efficiency, long service life, reduced frequency of manual maintenance and self-cleaning function.

The invention belongs to the field of protective films, and relates to an acrylic protective film for a metal grid touch sensor, the acrylic protective film comprises an acrylic acid adhesive layer, the acrylic acid adhesive layer comprises the following substances by weight: 100 parts of acrylic resin, 2-6 parts of a curing agent, 0.05-0.5 part of a catalyst, 2-6 parts of a retarder, 1-10 parts of a plasticizer, 0.1-0.5 part of a leveling agent, and 110-120 parts of a solvent. According to the technical scheme, the problems that after a protective film is attached to the metal grid sensor, adhesive residues are prone to occurring, and the dyne value of the surface is reduced are effectively solved, and the better subsequent ink printing effect is achieved.

This invention discloses a method for testing and evaluating the performance of downhole thin-layer sprayed support. The method includes: preparing sprayed layer samples and metal mesh samples with different spraying materials in a laboratory environment; testing and comparing the mechanical properties of different sprayed layer samples and the mechanical properties of the metal mesh samples to select a sprayed layer sample with comparable mechanical properties to the metal mesh sample and designate it as a qualified sprayed layer sample; cutting a standard sample from the qualified sprayed layer sample and testing it; spraying a qualified spraying material onto the surface of a section of the roadway to form a construction sprayed layer; taking samples at the corresponding locations of the construction sprayed layer to obtain construction samples and testing their mechanical properties in a laboratory environment; comparing the mechanical properties of the construction samples and the standard samples; if the difference in mechanical properties between the construction samples and the standard samples is less than 20%, the sprayed layer is qualified; if the difference exceeds 20%, the sprayed layer is unqualified. This invention effectively evaluates the support effect of downhole sprayed layers and characterizes the quality of the sprayed layer throughout the entire roadway.