45 results about "Spider web" patented technology

The utility model provides a fire-fighting suspended ceiling structure based on constructional engineering, and relates to the technical field of fire-fighting suspended ceilings, the fire-fighting suspended ceiling structure comprises a fire-fighting main pipe and a decorative cross rod, a connecting pipe is fixed on the peripheral surface of the fire-fighting main pipe, and a spray head is fixed at one end of the connecting pipe. The top space needs to contain a large number of infrastructures such as reinstalled central air conditioner pipelines, so that the pipeline layout above a room becomes complex and is interwoven like a spider web, and more seriously, the complex pipelines need to penetrate through the wall, so that the wall is provided with numerous holes, a large wall area is occupied, and the cost is reduced. At the same time, due to the lack of unified planning and design, it is often difficult to find a proper position to fix the suspended ceiling so that the two ends of the suspended ceiling can be kept at the same height, great challenges are brought to the installation of the fire-fighting suspended ceiling, and the installation process becomes complex and tedious.

The invention discloses a bionic structure supporting device for geological disaster emergency and an arrangement method, and relates to the technical field of rockfall prevention supporting, the bionic structure supporting device comprises a bionic mechanism, the bionic mechanism comprises a plurality of longitudinal wires, and a plurality of transverse wires are fixedly connected among the longitudinal wires; the foundation pit high-pressure pile manufacturing mechanism is mounted on the bionic mechanism and comprises a plurality of pit wall extrusion plates; a spider web steel wire structure is simulated through the bionic mechanism, the flexible net body absorbs kinetic energy through elastic deformation buffering during falling stone impact, flexible interception is achieved, and the defect that a rigid structure is prone to being damaged is overcome; by means of the overall cooperation characteristic of local stress, impact force is dispersed to the whole net body and an anchoring system, stress concentration is reduced, and impact resistance and protection stability are improved. The high-pressure pile manufacturing mechanism is installed before concrete injection, and pressure is applied to the foundation pit wall to increase friction force; after concrete is injected, the bonding strength is enhanced, foundation pile displacement caused by soil loosening is prevented, and the stability of falling stone bearing capacity is ensured.

The present application relates to the application of open-cage borane compounds in the preparation of immunosuppressants, belonging to the technical field of biological medicine. The open-cage borane compounds of the present application include nest borane compounds and / or spider web borane compounds, and the pharmaceutically acceptable solvates or pharmaceutically acceptable complexes of the nest borane compounds and the spider web borane compounds. The open-cage boron clusters of the present application have dehydrogenase-like activity, can catalyze the dehydrogenation reaction of hydroxyl-containing organic substrates in a biological system, promote the conversion of NAD(P) + to NAD(P)H, further improve the intracellular oxidation-reduction ratio, induce cell redox stress, and further reshape the metabolic pattern of HSCs from the source, promote the differentiation of immune cells to immunosuppressive phenotype, and play an immunosuppressive role.

The application relates to a nanofiber membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing polyurethane, nano lanthanum oxide, a waterproof agent and a solvent to obtain a spinning solution; (2) preparing an electrostatic spinning membrane through electrostatic spinning of the spinning solution; (3) spraying a finishing liquid on the electrostatic spinning membrane, and then performing heating treatment to obtain the nanofiber membrane. The polyurethane is stretched into superfine fibers through the electrostatic spinning technology, and a superhigh porous membrane similar to a spider web is prepared, the porous membrane has billions of nanoholes per square centimeter of the membrane, the nanofiber membrane has high air permeability and waterproof and moisture permeability, and the fibers are bound through a fiber bonding point technology, so that the fabric has excellent washing resistance. The nano lanthanum oxide heating functional particles are added to endow the nanofiber membrane with heating and heat storage functions, and further improve the washing resistance of the fabric.

The invention discloses a preparation method of a silicon carbide film with a cobweb structure. The method comprises the following steps: firstly preparing polycarbosilane solutions with different concentrations, then soaking a prepared silicon carbide membrane tube in the solution, and forming silicon carbide with a cobweb structure in membrane pores under the action of high-temperature calcination, thereby achieving the effect of reducing the pore diameter of the silicon carbide membrane. According to the structure, the rejection rate of the silicon carbide film is improved under the condition that the flux is not sacrificed, and a new thought is provided for preparing the silicon carbide film layer.

The application discloses a kind of all-around intelligent flexible ultrasonic transducer detection device and method, belong to medical ultrasonic detection technical field, the present application is by upper protective layer, metal shielding layer, insulating filler layer, upper layer printing electrode, piezoelectric layer, lower layer printing electrode, lower protective layer composition, wherein piezoelectric layer is by many piezoelectric array element composition radial multilayer ring belt, printing electrode layer is flexible electrode with "spider web structure" and "island-bridge" structure, metal shielding layer is added between protective layer and insulating layer absorption and reflection external electromagnetic wave;Annular positive pole is always connected with ultrasonic acquisition card channel, only need to make negative pole channel alternate connection, different angle radial array element can be made to work simultaneously, can be automatically attached skin, with flexibility and stretch performance, simultaneously using "ring-diameter" addressing flexible circuit design and addressing mode, less occupied ultrasonic acquisition card channel, and can realize automatic multiple position and multiple angle all-around ultrasonic detection.

The application discloses a high-bearing broadband vibration isolation device and system based on a spider-web-imitating metamaterial structure, which comprises a central bearing pedestal, a radial bearing assembly and a circumferential vibration suppression structure assembly; the radial bearing assembly comprises a plurality of radial support structures arranged in a ring direction periodically around the central bearing pedestal; the circumferential vibration suppression structure assembly is arranged in a net ring mode along the central bearing pedestal, and the circumference increases in a preset mode; each circumferential vibration suppression structure assembly comprises a plurality of linear strip-shaped vibration suppression units; the two ends of each linear strip-shaped vibration suppression unit are connected with two adjacent radial support structures respectively, and the connecting points are located between the first end and the second end of the corresponding radial support structure. The application is applied to the technical field of new materials and new structures for vibration and noise control, can realize low-frequency broadband vibration isolation effect under high bearing / small size, is convenient to process, and can be quickly adjusted and improved according to actual control requirements.

The invention is suitable for the technical field of safety protection equipment, and provides a trumpet-shaped bionic cobweb helmet filling structure design method, which comprises the following steps of: starting from the characteristics of a cobweb and a honeycomb structure, extracting cobweb radial lines, spiral lines and honeycomb hexagonal elements through similarity analysis, according to the bionics principle, deep analysis is carried out from structure, function and boundary similarity, cobweb features are subjected to three-dimensional processing, a winding mode is changed, the cobweb features are fused with honeycomb features to establish a three-dimensional preliminary trumpet-shaped bionic cobweb structure, element and size ranges are determined, structural parameters are optimized through a single-factor analysis method and a response curved surface method, and energy absorption performance is improved. According to the trumpet-shaped bionic cobweb helmet filling structure, the protective performance and the structural stability of the helmet can be remarkably improved.

The application discloses a kind of based on intelligent control's campus equipment operation and maintenance management and control platform, including detection module, abnormality analysis module and fault location processing module;Detection module constructs risk vector and spider web coordinate system, according to the spider web area and axis value dispersion degree start balanced or concentrated detection mode;Abnormality analysis module determines abnormal component and labels priority by constructing component data matrix, analyzing time series etc.;Fault location processing module calculates abnormal component correlation, generates fault feature cluster, matches fault type and sorts priority sequence;The platform solves the problems of multi-dimensional risk analysis missing, fault location extensive in traditional operation and maintenance, realizes the accurate assessment and hierarchical detection of equipment risk, the accurate determination of abnormal component, and the topological positioning and scientific scheduling of fault, improves the accuracy and efficiency of campus equipment operation and maintenance, and guarantees the safe and efficient operation of equipment.

The application relates to the technical field of sensors and provides a MEMS bionic acceleration sensor based on a cobweb structure, which comprises a frame, the frame is provided with a cavity, a mass block is arranged in the cavity and located at the center of the cavity, a plurality of variable cross-section cantilever beams are arranged in the cavity and surround the mass block, the middle part of each variable cross-section cantilever beam is a stress-free zone, the two ends of each variable cross-section cantilever beam are stress zones, the stress zones at the two ends of each variable cross-section cantilever beam are connected with the mass block and the frame respectively, piezoelectric films are arranged in the stress zones at the two ends of each variable cross-section cantilever beam, and interdigital electrodes are arranged on the piezoelectric films, a plurality of connecting beams are arranged in the cavity, and the two ends of each connecting beam are connected with the stress-free zones of the adjacent variable cross-section cantilever beams respectively. The application improves the charge sensitivity, reduces the noise, maximally suppresses the cross-axis crosstalk, and reduces the cross-axis sensitivity of the acceleration sensor.

The invention provides a manned lunar rover variable-stiffness flexible wheel based on shape memory alloy, and relates to the technical field of aircrafts for cosmic sailing, the manned lunar rover variable-stiffness flexible wheel comprises a hub, a tread and a support body; the support body is connected between the hub and the tread, and the structure of the support body simulates the arrangement mode of cobweb radial wires and spiral wires; the tread and the supporting body are both made of shape memory alloy with a hyperelastic effect; the peripheral wall of the tread is provided with ground gripping teeth, and the ground gripping teeth can retract into the outer wall of the tread when the lunar rover runs on the lunar surface with good conditions; the ground gripping teeth can further extend outwards in the direction perpendicular to the outer wall of the tread when the lunar rover runs on the complex lunar surface. The distribution density and the thickness of the supporting bodies are gradually changed from large to small from the position close to the hub to the position close to the tread, so that the wheel can be subjected to self-adaptive rigidity adjustment; energy is absorbed through the tread and the supporting body, and mechanical energy is converted into heat energy to be dissipated, so that the riding comfort is improved; and the ground gripping teeth are designed on the tread, so that the traction capability of the wheel can be improved.

The invention discloses a corner-reinforced spider web hyperbolic bionic pillar sandwich panel and a hovercar chassis. The corner-reinforced spider web hyperbolic bionic pillar sandwich panel comprises an inner core layer and panels fixedly connected to the two sides of the inner core layer. The inner core layer comprises a plurality of pillar units arranged in a two-dimensional periodic array; each supporting column unit comprises a hyperbolic supporting column with the middle contracting and the two ends expanding, and corner reinforcing structures arranged at the two axial ends of the hyperbolic supporting column correspondingly. The corner reinforcing structure comprises a plurality of radial supporting components and at least one annular supporting component, each radial supporting component extends in the radial direction of the end face of the hyperbolic supporting column, one end of each radial supporting component is connected to the center of the end face, and the other end of each radial supporting component is connected to a connecting point of the periphery of the end face. The annular supporting component is arranged around the center of the end face, and the annular supporting component and the radial supporting component are connected to form a spider web structure. Efficient energy absorption and stress dispersion can be achieved under vertical impact and multi-direction loads, and therefore the impact resistance of the hovercar chassis is remarkably improved.

The application discloses a spider-web optical fiber ribbon cable and a preparation method thereof, and relates to the technical field of optical cable materials. The spider-web optical fiber ribbon cable is composed of at least a central reinforcing element, an air-core optical fiber ribbon unit, a protection unit and a sheath layer. The air-core optical fiber ribbon unit is arranged outside the central reinforcing element, the protection unit is arranged around and covers the outside of the air-core optical fiber ribbon unit, and the sheath layer is wrapped outside the protection unit. The air-core optical fiber ribbon unit is obtained by fixing a plurality of spider-web structure cladding air-core optical fibers with a coating layer on the surface through an adhesive. The application realizes the problems of structure protection and interface compatibility by adopting a novel coating material to prepare the coating layer on the spider-web structure cladding air-core optical fiber. The modulus matching and delamination problems are solved by using a novel adhesive, and finally, the stable-performance spider-web optical fiber ribbon cable is prepared.

The application discloses a complex curved surface space cooling channel design method based on a spider web bionic structure. The method is based on the characteristics of the complex curved surface space structure, extracts the main geometric features of the spider web bionic structure, and is supplemented by three-dimensional curved surface structure topological mapping technology to realize the design of the cooling channel inside the curved surface space. The simulation test verification of the method shows that the overall flow field distribution is uniform, the heat exchange performance is excellent, and the flow resistance characteristic is low, and the method can provide cooling design support for high heat flux and high heat load components.

The invention belongs to an oil and gas field surface engineering corrosion and protection technology, particularly relates to a cathode effectiveness testing device for simulating corrosion of an outer bottom plate of a storage tank, and aims to solve the problems of limited protection range, short service life, low efficiency and limitation in the conventional storage tank cathode protection technology. The test device comprises a storage tank outer bottom plate simplified model and a storage tank outer bottom plate simplified model test device. The cobweb model is composed of a plurality of connected cables, a discus is placed at each cable connection position of the cobweb model, and the part, except the cables and the discus, in the cobweb model is covered with an insulating film; a cathode protection power supply is connected to a discus, and a cathode outlet cable of the cathode protection power supply is connected to a cable of the simplified model of the outer bottom plate of the storage tank, so that the cathode effectiveness test of the simplified model of the outer bottom plate of the storage tank is realized. According to the invention, the data test of the influence degree of the anode spacing, the grounding grid and the waste pipeline on the cathode protection potential and current of the outer bottom plate of the storage tank is realized.

The invention relates to a Fiedler cobweb privacy protection noise mechanism construction method based on Transform, and belongs to the technical field of high-order networks and privacy protection noise. According to the method, from two dimensions of node attributes and local topology, bipartite representation of nodes and hyperedges is constructed, deep interactive modeling is performed on the nodes and the hyperedges through a Transform trans-attention mechanism, and an enhanced hypergraph incidence matrix is generated. And constructing a normalized hypergraph Laplacian matrix based on the enhanced hypergraph incidence matrix, and extracting Fiedler values and corresponding feature vectors through spectral decomposition so as to describe global structure features of the hypergraph. A Fiedler value is used as a global reference, the association influence of each hyperedge is calculated in combination with enhanced hypergraph association, the maximum influence is used as a noise sensitivity scale, a Fiedler noise disturbance mechanism is designed, differential protection is applied to a query result, effective defense of epsilon-level cobweb privacy protection is achieved, and the privacy protection effect of a cobweb is improved. Therefore, the high-efficiency availability of data query is kept while the risk of hypergraph sensitive information leakage is reduced.

The utility model discloses a novel indwelling needle which comprises an infusion inner tube, an infusion sleeve and a buffering and limiting structure, the infusion inner tube is movably inserted into the inner side of the infusion sleeve, and the buffering and limiting structure is installed between the infusion inner tube and the infusion sleeve. The utility model relates to the technical field of medical instruments, in particular to a bionic structure composite flexible material which is inspired and designed by a cobweb structure, has excellent buffering performance and can dissipate as high as 70% of dynamic impact energy in the air. The impact force is dispersed and absorbed in multiple directions due to the interaction of the complex weaving mode and the fibers, and the single-direction impact pressure on the wrist of a user is effectively reduced; the sleeve wrist guard provides preliminary buffering, so that the wrist of a user is protected from discomfort in the infusion process; the plastic pipe on the inner side of the cobweb rubber ring is used for secondary buffering, and vibration and impact in the infusion process are further reduced.

The invention discloses a CH4-CO2 reforming bionic spider web foam reactor and an optimization design method thereof, which are inspired by excellent performance of spider webs in the aspects of bearing mechanical stress and transferring heat energy, and designs a novel foam reactor combining a high-thermal-conductivity copper alloy spider web structure and high-mechanical-strength nickel-chromium alloy porous foam. Further, parameter optimization is carried out on the branch spacing H, the main branch thickness m and the branch thickness L of the reactor through a response surface method (RSM), and when H is equal to 3 mm, m is equal to 0.9 mm and L is equal to 0.96 mm, the efficiency of converting solar energy into fuel reaches up to 41.54%. The thermal shock of non-uniform concentrating solar energy is effectively resisted, the temperature field distribution uniformity of the foam reactor is improved, the energy conversion efficiency of the foam reactor is remarkably improved, and a new reactor design scheme is provided for realizing efficient concentrating solar energy driven CH4-CO2 reforming.

The application discloses a debris flow protection structure and relates to the technical field of debris flow disaster prevention engineering, which comprises an energy dissipation deceleration layer arranged vertically and a storage and blocking layer arranged obliquely. The energy dissipation deceleration layer is composed of a plurality of first composite anchor cables arranged horizontally or obliquely, and the storage and blocking layer is composed of a spider web-shaped blocking net woven by second composite anchor cables. The composite anchor cables are all provided with a bamboo piece anti-collision layer structure outside a carbon fiber composite material anchor cable body. The end portions of the first composite anchor cables and the blocking net are anchored to a base body through a connecting structure, and the connecting structure comprises a tension-compression conversion mechanism with an embedded energy dissipation pipe and a wave-shaped clamping piece clamping mechanism. The two-stage protection mechanism is used to realize impact kinetic energy dissipation and solid matter blocking and storage successively, and effectively solves the problems of easy corrosion and easy failure of a traditional metal structure and the problems of large self-weight and difficult construction of a reinforced concrete structure, and has the advantages of strong impact resistance, good durability, light weight, high strength and good environmental adaptability.

The utility model discloses a girl skirt with a sparkling spirit function and a lamp belt and spiders, and aims to solve the problems that the traditional game clothes are stiff, lack of creativity, insufficient atmosphere and interestingness when seeing too much, and difficult to impress deeply. The cobweb patterns made of the light guide fibers are arranged on the skirt body, the lamp beads are arranged in the centers of the cobweb patterns, the lamp beads can illuminate light guide limiting positions, the cobweb patterns are clearer and more dazzling, the interestingness and the atmosphere of the game suit are improved, the lamp beads are detachably connected with the skirt body through the hook-and-loop fasteners, and therefore the game suit is more attractive in appearance. The game suit is convenient to clean, the battery is arranged at the back waist position and does not hinder actions of a user, the battery is a button switch, the user can operate the game suit without taking out the battery, and the user can conveniently control on and off of the lamp beads.

The invention discloses a spider silk collecting device and process, and particularly relates to the technical field of spider silk, the spider silk collecting device comprises a telescopic rod composed of an expansion sleeve and two long rods, the head of the telescopic rod is provided with an installation assembly, the front portion of the installation assembly is provided with flannelette fixed through an opening clamp, and the surface of the flannelette is provided with three-dimensional fluff. And collecting the whole cobweb by means of the three-dimensional fluff. According to the spider silk collecting device and technology, in the storage technology, the flannelette attached with spider webs is fixed to the foaming plates through insect needles, spider silk stress and adhesion caused by flannelette bending are effectively avoided, and through the small foaming plates fixed to the four corners of the foaming plates, when a plurality of foaming plates carrying spider silk are placed in a carton, the spider silk collecting effect is good, and the spider silk collecting effect is good. Stable intervals are formed, and extrusion damage during transportation or storage is prevented.

1. Name of the design product: cup body (70 spider web). 2. Use of the design product: circular container with spider web shape on the surface for storage and decoration. It can be used as a juice cup with a lid and a straw, or as a vase for decoration. 3. Design points of the design product: combination of shape and pattern. 4. Picture or photo that best shows the design points: front view.

1. Name of the designed product: Robot (spider web). 2. Use of the designed product: for robots. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view.

The invention relates to the technical field of bactericide preparation, in particular to a device and a method for preparing a botanical bactericide for green prevention and control of ganoderma arachnoid. In the using process of an existing device, ethyl alcohol and fructus cnidii cannot be fully stirred conveniently, a condensed extracting solution cannot be fully collected conveniently, and therefore the efficiency of preparing a bactericide is low. The device comprises a bottom plate, the bottom plate is fixedly connected with an extraction furnace, and the bottom plate is fixedly connected with a reaction furnace and a recrystallization furnace. The driving motor drives the rotating shaft to rotate, so that the stirring frame slides up and down in a reciprocating manner to fully stir fructus cnidii and ethanol in the extraction furnace, the fructus cnidii and the ethanol are uniformly mixed, effective substances in the fructus cnidii are extracted, and the quality of an extracting solution is improved.

This invention relates to a flexible, anti-icing, multi-scale structure and its preparation method. The structure's substrate is a flexible, conductive, porous material. A spiderweb-like structure is formed on the surface of the substrate, exhibiting a hydrophilic state. A multi-scale micro / nano composite structure is formed around the spiderweb-like structure on the substrate surface, exhibiting a hydrophobic state. The method includes: Step 1: Using the flexible, conductive, porous structure as an electroplating cathode, electroplating is performed in an electrolyte solution to grow an adjustable multi-scale micro / nano composite structure on the conductive porous framework, exhibiting a hydrophobic state; Step 2: The porous structure obtained in Step 1 is directly written using a femtosecond laser to create a spiderweb-like structure, with the spiderweb network exhibiting a hydrophilic state. The structure of this invention is flexible, anti-icing, and capable of capturing and collecting droplets in low-temperature environments.

The application relates to the technical field of traditional Chinese medicine research, in particular to a screening method for quality markers of Aidi preparation. The method comprises the following steps: firstly, qualitatively analyzing chemical components, then quantitatively analyzing components with high content and capable of quantitative determination in traditional Chinese medicine; investigating the influence of light and temperature factors on the content of each component; according to the compatibility law of the monarch, minister, assistant and guide of the original medicinal materials in the compound, attributing the compounds; evaluating the anti-tumor and anti-angiogenesis activities of the candidate Q-markers and their respective synergistic activities of adriamycin in resisting tumor and anti-angiogenesis and reducing myocardial toxicity. Finally, a seven-dimensional spider web of “compatibility-content-stability-anti-tumor cell activity-synergistic DOX anti-tumor activity-anti-angiogenesis activity-synergistic DOX anti-angiogenesis activity” and a four-dimensional spider web of “compatibility-content-stability-reducing DOX cardiotoxicity” are established, and the Q-markers for resisting tumor and protecting heart toxicity of AD are comprehensively analyzed.

The application discloses a rigid-flexible coupling sealed oil-water isolation replacement ship oil tank, which comprises an oil tank shell, a plurality of connecting ports are formed in the top of the oil tank shell, and the connecting ports are distributed in a spider web mode; a sealed flexible diaphragm is arranged in the oil tank shell; a protrusion is arranged on the top of the sealed flexible diaphragm, the sealed flexible diaphragm is sealingly connected with the connecting ports through the protrusion, and temperature sensors and pressure sensors are arranged in the sealed flexible diaphragm; an escalator is arranged in the oil tank shell, and a double-opening horn-shaped wave energy power generation device is connected to the escalator; and the wave energy power generation device is used for realizing collection, conversion and storage of wave energy. The rigid-flexible coupling sealed oil-water isolation replacement ship oil tank realizes large-area rigid-flexible coupling high-quality sealing, intelligent detection and energy-saving treatment under the condition of oil-water isolation replacement, improves energy utilization rate, and has high industrial application value.

The invention discloses a spider web-shaped channel cooling plate for energy storage, and relates to the field of channel cooling plates. The spider web-shaped channel cooling plate for energy storage comprises a cooling base plate and a cooling pipe, the cooling pipe is arranged on the front face of the cooling base plate, and a water inlet pipe is arranged on the top, located on the left side of the front face of the cooling base plate, of one side of the cooling pipe. According to the spider web-shaped channel cooling plate for energy storage provided by the invention, when the diameter of the cooling pipe is 7mm, the thickness of the cooling substrate is 12mm, and the channel spacing of the cooling pipe is 16mm, the heat exchange effect between the cooling substrate and an external battery module needing to be cooled is optimal; the maximum temperature and the temperature difference increase of the external battery module needing to be cooled are reduced along with the increase of the diameter, the distance and the thickness, through reasonable layout, the cooling channels of the cooling base plate and the cooling pipes are designed to be spider web-shaped, the heat exchange efficiency between the cooling base plate and the external battery pack is higher, and energy is saved.

The utility model discloses intelligent garden information monitoring equipment, which relates to the technical field of monitoring equipment and comprises a shell, a processing machine body is fixedly connected in a cavity of the shell, a monitoring head is fixedly connected to the bottom of the shell, and a climate detection device is fixedly connected to the top of the shell. The bottom of the shell is fixedly connected with a transparent cover cylinder through a sealing connecting machine, the bottom of the transparent cover cylinder is fixedly connected with a base, and the bottom of the base is fixedly connected with a mounting support. According to the shell provided by the utility model, sealing is enhanced and moisture-proof and drying protection is realized while impurities such as dust and spider webs are prevented from influencing a monitoring picture, so that the problems that the image acquisition definition is reduced and the image quality is influenced due to the fact that the impurities such as dust and spider webs are easily accumulated on the surface of the existing intelligent garden information monitoring equipment are solved. The humidity of the garden area is relatively high, so that the equipment is easily affected with damp and the use is affected.

A multilayer material (1) comprising in sequence (a) a base layer (2) consisting of a plurality of sublayers (5, 6), having spider web structures (7) made of polymeric fibres and / or mineral fibres immersed in a synthetic resin matrix; (b) a central layer (3) made of ceramic material; and (c) a front layer (4) composed of one or more sublayers, each of which comprises one or more spider web structures (7) made of polymeric fibres and / or mineral fibres immersed in a synthetic resin matrix.