38results about How to "Cost reduction needs" patented technology

The invention discloses an improved YOLOv11 crack identification and quantification method for a strip mine area and a slope thereof. The method comprises the steps of data preprocessing, model improvement and adaptability adjustment, initial identification model training, crack detection by applying a target identification model, local area identification and post-processing. According to the method, technical means such as a feature extraction network improvement method based on an AReLU function and an ACmix model and a self-adaptive local threshold segmentation algorithm based on a gray scale standard deviation are introduced, and efficient and accurate recognition of cracks is achieved. According to the method, the automation degree of crack detection is improved, the labor cost and the time cost are reduced, and the method is of great significance to safety monitoring of the strip mine area.

The invention relates to a tunnel ponding early warning method and device, computer equipment and a storage medium. The method comprises the steps that at least two first flow detection units are arranged at an inlet and an outlet of a tunnel, at least one second flow detection unit is arranged at a water outlet of the tunnel, local water accumulation threshold values of a plurality of water accumulation sensitive areas are determined based on historical water accumulation data, and the local water accumulation threshold values are arranged according to the threshold values to obtain a threshold value distribution sequence; dividing the threshold distribution sequence into a first sequence and a second sequence based on a preset proportion, and determining a first global threshold by a local ponding threshold at the boundary of the first sequence and the second sequence; calculating the inlet and outlet flow difference according to the first flow data and the second flow data, and further determining the water accumulation amount; and adjusting a second global threshold value according to the ponding risk index, and starting a corresponding risk early warning strategy when the ponding amount exceeds the first global threshold value or the second global threshold value. Low-cost and high-precision tunnel ponding monitoring is realized based on simplified sensing data, and the safety of tunnel passage is improved.

The invention discloses a sensor data detection optimization method based on an HMM (Hidden Markov Model). A hidden Markov model (HMM) describes a process of randomly generating an unobservable state sequence by an HMM chain and then generating an observation sequence by the state sequence; after a hidden Markov model HMM is established, performing comparative analysis according to data acquired by a current sensor and an observation sequence, and finally outputting a current state judgment value; in the process of completing the prediction problem, a likelihood function is calculated by using a forward algorithm and a backward algorithm combined convention algorithm, and then model parameters are estimated by using an optimized unsupervised learning algorithm to calculate and determine a maximum likelihood estimation method. And finally, predicting a state sequence of a hidden Markov model (HMM) process according to the model with known parameters and the observation sequence. The method has the beneficial effects that the processing speed is higher, the hardware cost requirement is lower, and the data detection precision is more accurate.

The utility model provides a direct current motor driving force steering structure, which comprises a rotating disc, two electrode plates are symmetrically arranged at the bottom of the rotating disc, the two electrode plates are respectively connected with a positive electrode and a negative electrode of a power supply, a conducting plate is arranged below a motor plate in a contact manner, and a lead is arranged on the electrode plates. And the other end of the wire is wound out from the outer side edge of the rotating disc and extends out from the opposite side. An electrode plate and a conducting plate are arranged in a power supply circuit of the direct-current motor, when the electrode plate is in contact with the conducting plate, a circuit of the direct-current motor is conducted, a wire of the electrode plate is long, enters from the outside, is wound on the outer side edge of the rotating disc and is connected to the electrode plate, and after the electrode plate rotates to the other side, the conducting plate in contact with the electrode plate is changed; according to the method, the direction of the driving force of the direct current motor can be changed only by rotating the rotating disc, so that the method is simple, convenient and lower in cost.

The invention discloses a power distribution cabinet electrical equipment internal operation state monitoring time sequence analysis system. The model is a sensor data detection model based on an HMM (Hidden Markov Model), and the HMM is a dynamic Bayesian network generation model capable of being used for marking problems and describes a process of randomly generating an unobservable state sequence by an HMM chain and then generating an observation sequence by the state sequence; the HMM is determined by initial probability distribution, state transition probability distribution and observation probability distribution, the initial probability distribution and the state transition probability distribution determine an HMM chain, and an unobservable state sequence is generated; observing probability distribution to determine how to generate an observation sequence from the state sequence; and after the HMM is established, performing comparative analysis according to data acquired by the current sensor and an observation sequence, and finally outputting a current state judgment value. The method has the beneficial effects that the processing speed is higher, the hardware cost requirement is lower, and the data detection precision is more accurate.

A connecting structure for an ultrathin stainless steel storage box comprises a box bottom, a short shell and a barrel section. The box bottom comprises a transition ring, a circular ring and a top cover flange, the transition ring and the circular ring are welded through a circumferential weld, and the circular ring and the top cover flange are welded through a circumferential weld; the transition ring comprises a plurality of bent arc plates and a plurality of reinforcing strips, the bent arc plates are welded and connected through longitudinal seams, and the longitudinal seams are reinforced through the reinforcing strips; a bottom locking structure is arranged in the bent arc plate, the bent arc plate is connected with the short shell through bottom locking welding, and the bent arc plate is connected with the cylinder section in a butt welding mode. The hard stainless steel plate is selected as the raw material, the performance of the transition ring is guaranteed, and the problem of low hot forging performance is avoided; the connecting face of the transition ring and the cylinder section is arranged at the position 100 mm away from the equatorial plane, and the problem of additional bending moment of a welding seam at the position is solved. Reinforcing strips are introduced into weak longitudinal joints of the transition ring, and the problem of performance degradation caused by welding joints is solved.

The invention discloses a salt and fresh water mixing irrigation device and method, and belongs to the technical field of agricultural instruments.The salt and fresh water mixing irrigation device comprises a pedestal, a mounting seat is fixedly connected to the upper surface of the pedestal, a connecting pump is fixedly connected to the mounting seat, and an input port and an output port of the connecting pump are connected with a middle pipe and a drainage pipe correspondingly. A swing rod, a first floating plate, teeth, a first gear and a control valve are adopted, when the fresh water level is high and the salt water level is low, the device can automatically reduce the inflow amount of fresh water and increase the mixing proportion of salt water, and vice versa, and the automatic adjusting mechanism ensures that under the condition that the water source condition fluctuates, the salt water can be continuously mixed. The device can automatically adjust the proportion of fresh water and saline water, the appropriate salinity concentration of irrigation water is kept, and no electric drive or manual intervention is needed. The system has the remarkable advantages that the system has the characteristics of automation and passive adjustment, so that the intelligence and efficiency of the irrigation system are improved, and the operation cost and the maintenance requirement are reduced.

The application discloses a kind of based on spot image moment feature telescope primary and secondary mirror calibration method, belong to telescope computer-aided alignment field.The specific steps of the calibration method are as follows, first, randomly give the free degree misadjustment of telescope system secondary mirror, utilize unbiased finite impulse response moment to extract the spot image feature of multiple field of view within reasonable range under the misadjustment state of telescope;Then utilize fully connected neural network to construct the model between the free degree misadjustment of secondary mirror and the multiple field of view spot image feature matrix;In actual use, after the multiple field of view spot image collected by CCD camera is extracted into feature matrix using unbiased finite impulse response, it is input into the trained neural network model to solve the misadjustment of secondary mirror, to guide the alignment of telescope system.This method aims to wavefront sensor as the image quality evaluation benchmark of telescope without, and without multiple iterations, to improve the efficiency of system primary and secondary mirror alignment and the imaging quality of system.

The invention is applicable to the technical field of seabed hydrogen storage, and provides a large-scale underwater constant-pressure hydrogen storage device which comprises a hydrogen storage tank, a hydrogen supply network and a hydrogen transportation pipeline, and the hydrogen storage tank is connected with the hydrogen supply network through the hydrogen transportation pipeline; the hydrogen storage tank comprises a rigid gas storage tank and a composite suction caisson arranged at the bottom of the rigid gas storage tank, a central pipeline connected with a hydrogen conveying pipeline is arranged in the rigid gas storage tank, and a seawater port used for seawater inflow or discharge is further formed in the bottom of the rigid gas storage tank. A seawater filter used for filtering seawater is further arranged in the seawater port, and a storage tank flexible film used for preventing compressed hydrogen from making contact with the seawater is further arranged in the rigid gas storage tank. And the underwater hydrogen storage technology is promoted to develop in a more efficient, safer and more economical direction, and contributions are made to sustainable development of the hydrogen energy industry.

The present invention belongs to the technical field of tunnel lining repair, and specifically relates to an active and passive integrated repair mortar for leaking tunnel lining and a construction process. The active and passive integrated repair mortar for leaking tunnel lining of the present invention comprises a microbial slurry, a cementing solution and a self-repairing capsule; the components of the microbial slurry include urease bacteria and nutrients; the components of the cementing solution include urea and a first calcium salt; the self-repairing capsule is a core-shell structure, having an inner core and an outer shell, the components of the inner core include polyethylene glycol, urease bacteria spores and an activator, the components of the outer shell include epoxy resin and sodium alginate; the components of the activator include yeast extract, urea, a second nitrogen source and a second calcium salt. The construction process of the active and passive integrated repair mortar for leaking tunnel lining of the present invention is simple and easy, and can effectively reduce the leakage of cracks in tunnel lining.

The invention discloses a block chain node data exchange method, a readable storage medium and equipment, and the method comprises the steps: carrying out the coding processing of original block data, and obtaining a plurality of block units; and calculating the storage load difference, the block decoding communication overhead and the node reputation of the target block chain node group of each block unit, and determining an optimal block unit allocation scheme with low load difference and low decoding communication overhead among the target block chain nodes. According to the invention, based on the storage load difference, the block decoding communication overhead and the node reputation of the target block chain node group, the optimal block unit allocation scheme of low load difference and low decoding communication overhead between the nodes is determined, and the block units are stored according to the optimal block unit allocation scheme, so that the storage load of the nodes is greatly reduced, and the storage efficiency of the nodes is improved. The problems of unreasonable block unit distribution and overlarge node storage pressure in the current block chain are solved.

This application discloses a table generation method, apparatus, electronic device, and medium, relating to the field of data processing technology. A specific implementation of the method includes: modifying information in a table to be modified based on preset change rules to obtain a table template file containing at least one variable placeholder; generating a target mapping table file based on at least one variable placeholder and at least one set of actual variable information, the target mapping table file being used to establish a variable mapping relationship between at least one variable placeholder and at least one actual variable in each set of actual variable information; and performing at least one variable substitution operation on the table template file based on at least one set of variable mapping relationships in the target mapping table file to obtain at least one target information table. This achieves automated, standardized, and batch generation of information tables, significantly improving the efficiency and standardization of maintenance document generation, while balancing the flexibility, maintainability, and low-cost requirements of table generation.

The application provides a nucleic acid cleavage device and a control method thereof, wherein the nucleic acid cleavage device comprises a device main body and a vibrating needle body, the vibrating needle body is detachably connected with the device main body, an ultrasonic unit is arranged in the device main body, an ultrasonic head of the ultrasonic unit is vibrationally coupled with the vibrating needle body, and the vibrating needle body has a cleavage working state of being at least partially inserted into a nucleic acid reaction liquid in a reaction liquid container. The ultrasonic unit directly conducts the action on the vibrating needle body to generate high-frequency vibration and then directly conducts the action on the nucleic acid reaction liquid, so that strong vibration and micro-flow effect are caused in the nucleic acid reaction liquid, the shearing force of the cleavage liquid on the cell membrane is enhanced, and the cleavage is more uniform. Since the ultrasonic wave can be directly conducted to the liquid in which the vibrating needle body is inserted and is not absorbed and scattered by a container base body with a large size, the utilization efficiency of the ultrasonic wave energy is significantly improved, and the cleavage time is shorter.

This application provides a real-time hyperspectral local anomaly detection method and device based on multi-line, multi-band recursive updates. The method includes: acquiring new data blocks for a target scene in real time using a filter array spectral imaging system; updating the current global mean vector and the multi-line, multi-band correlation matrix used for background modeling for the target scene using a recursive update formula to obtain the updated global mean vector and the updated multi-line, multi-band correlation matrix; acquiring the local spatial neighborhood statistics of the new data blocks; and performing local anomaly detection on the new data blocks based on the local spatial neighborhood statistics to obtain the current anomaly detection result data for the target scene. This application can realize local anomaly detection for multi-line, multi-band hyperspectral data and can solve the problems of high computational cost, large storage requirements, and insufficient real-time performance of traditional global covariance matrix calculations in complex industrial backgrounds.

The invention discloses a method for calculating the undercompaction and overpressure contribution rate of drilled mudstone by using an equivalent depth method, and relates to the technical field of petroleum and natural gas exploration, and the method comprises the following steps: collecting formation pressure test data of a drilled well in a research area, including formation pressure test points of the drilled well; respectively calculating the overlying rock pressure P0 of the drilled well and the hydrostatic pressure Phydrostatic of the drilled well; determining the equivalent depth H of the depth of the formation pressure test point; according to the overlying rock pressure P0 of the drilled well, the hydrostatic pressure P hydrostatic of the drilled well, the formation pressure test point of the drilled well and the equivalent depth H of the depth of the formation pressure test point, the undercompaction and overpressure contribution rate R of the drilled well mudstone is obtained.

The invention provides an intelligent water treatment safety house, a water treatment method, an intelligent control module and a medium, the intelligent water treatment safety house comprises a movable building shell, a photovoltaic power generation module, the intelligent control module, a water pump and a purification module, direct current in the energy storage equipment is converted into alternating current through the alternating current inverter for the water pump to work; the intelligent control module is used for intelligently controlling the working state of the water pump; the purification module comprises pre-filtration equipment, reverse osmosis equipment, sterilization equipment and a pure water tank; the pre-filtering equipment is used for filtering raw water pumped by the water pump; the reverse osmosis equipment is used for filtering the water filtered by the pre-filtering equipment by using a reverse osmosis membrane to obtain pure water; the sterilization equipment is used for sterilizing the pure water filtered by the reverse osmosis membrane; and the pure water tank is used for storing the sterilized pure water. The invention is used for providing an efficient, energy-saving and intelligent water treatment solution.

The invention discloses a target detection model pruning method, and relates to the technical field of model pruning, and the method comprises the following steps: constructing and training a target detection model, carrying out the pruning training of the target detection model, obtaining a structured stripe pruning model, and carrying out the re-training of the model through a mixed precision training method, so as to complete the pruning. According to the method, training and dynamic sparsification processing are performed on the model before pruning of the target detection model, so that the target detection model can reach the expected accuracy before pruning, the model performance is improved, the subsequent pruning processing efficiency is improved, pruning training is performed on the target detection model in combination with network pruning and stripe pruning, and the training efficiency is improved. According to the method, a convolution kernel skeleton matrix is obtained, stripes, smaller than a pruning threshold, in the corresponding convolution kernel skeleton matrix are sheared according to a preset pruning proportion, so that structuring of the convolution kernel is achieved, meanwhile, a structured stripe pruning model is trained again through a mixed precision training method to complete final model pruning processing, and the compression ratio and precision loss of the model can be balanced.

The invention relates to the technical field of charging and discharging equipment, in particular to a super capacitor charging circuit and a super capacitor charger for a variable pitch system. The super capacitor charging circuit is of a three-level structure formed by connecting an EMI filter circuit, a PFC circuit and three independent ACF circuits in parallel, the three-level topological structure integrates core functions of filtering, power correction and isolation transformation, redundant components are reduced, hardware cost and installation space requirements are reduced, and the super capacitor charging circuit is adaptive to compact scene application; meanwhile, through the fusion design of the ACF circuit and the PFC circuit and the combination of the zero-voltage switching and zero-current switching technologies, the switching loss and electromagnetic interference are greatly reduced, the high power factor is ensured, and the problems of efficiency superposition loss of a traditional two-stage architecture and limited power of a single-stage architecture are solved; the three ACF circuits operate in parallel and independently work, and can charge the three super capacitors at the same time to save cost; the maintenance or fault of a single ACF circuit does not affect the normal operation of other loops, and the reliability of the system is improved.

The invention discloses an active noise reduction device with a passive basin loudspeaker cavity, and belongs to the technical field of noise reduction devices. Comprising a noise reduction household appliance body. The active noise reduction controller is arranged in the noise reduction household appliance body; the plurality of reference microphones are used for collecting original noise signals generated during operation of the noise reduction household appliance; the at least one loudspeaker unit comprises a passive basin, is electrically connected with the power amplifier of the active noise reduction controller and is used for playing reverse sound waves; the error microphone is used for collecting a residual noise signal formed by superposing the original noise and the reverse sound wave which are transmitted through the real secondary path; the signal processor is used for receiving an original noise signal which is transmitted by the reference microphone and is subjected to AD conversion, and generating a reverse sound wave digital signal which is equal to the original noise in amplitude and opposite to the original noise in phase through an adaptive algorithm, and the reverse sound wave digital signal is input into the power amplifier for signal amplification after being subjected to DA conversion; and then the loudspeaker unit containing the passive basin is driven to play reverse sound waves.

The utility model discloses a modularized integrated protection platform, and relates to the technical field of building construction. The modularized integrated protection platform comprises at least two cantilever beams which are fixed on a building outer wall at the same height, an inner stand column and an outer stand column which extend upwards are sequentially connected to the cantilever beams in the direction away from the building outer wall, and at least one layer of walkway plate is connected between the inner stand column and the outer stand column. An outer protective net is connected between every two adjacent outer stand columns. According to the modularized integrated protection platform provided by the embodiment of the invention, the modularized design is adopted, the modularized assemblies can be quickly assembled, the field assembly time is shortened, the installation process is quicker, simpler and more convenient, and therefore the construction speed is increased.

Crude gas generated by a gasification furnace of the European smelting furnace is subjected to coarse dust removal through gravity dust removal, the dust removal ash is discharged to a gravity dust storage tank on the lower portion through a dust discharging valve, a material level meter of a tank body is remotely observed, a high material level is achieved, the dust discharging valve is closed, and the dust removal ash is discharged to the gravity dust storage tank through the dust discharging valve. A tank body pressure display device is remotely observed, a tank body blow-off valve is closed, the nitrogen pressure of a nitrogen source is adjusted to 0.8 MPa through a nitrogen pressure adjusting device, an in-tank stamping device 10 is started to stamp the interior of the tank to 0.8 MPa, a lower fluidization ash conveying device is started to adjust nitrogen to 0.6 MPa, the nitrogen pressure is adjusted to 0.1-0.3 MPa through an ash conveying pipe and an ash conveying device, and the nitrogen pressure is adjusted to 0.8 MPa through a nitrogen pressure adjusting device. And dense phase conveying is started, gravity ash is conveyed to a raw coal bunker of the coal injection system, and ash conveying is stopped after the ash is conveyed to the low material level. And ash conveying nitrogen is connected to the environment dust removal bag box body through a pipeline and is discharged by the environment dust removal bag box body.

The invention provides an automatic film roll packaging production line which comprises a film roll packaging preparation area for packaging film rolls and a film roll stacking and packaging area which is adjacent to the film roll packaging preparation area and used for packaging the film rolls, and the film roll stacking and packaging area can conduct single-layer or double-layer stacking on the film rolls. The film roll stacking and packaging area is provided with the stacking mechanism, the first conveying belt, the second conveying belt, the third conveying belt, the first transferring device, the second transferring device and the stacking backflow conveying device. The stacking backflow conveying device allows stacked film roll sets to flow back to the stacking mechanism for double-layer stacking, the space utilization rate is remarkably increased, the number of trays and the number of times of transportation are reduced, and therefore the transportation cost and the storage requirement are reduced. The invention further provides a corresponding film roll packaging production process which comprises the steps of paper core labeling, film roll centering, hot melting sealing packaging, end cover buckling, overturning labeling, stacking packaging and the like, the double-layer stacking requirement of the film roll can be met, and the production flexibility and efficiency are improved.

The invention relates to an atrial fibrillation ablation postoperative recurrence continuous learning prediction system based on multi-source electrocardiogram data. The system comprises a data acquisition module, a data processing module, a feature recognition module and a risk prediction module. According to the invention, the electrocardiogram representation network is constructed to process different pieces of follow-up visit electrocardiogram information during follow-up visit, so that corresponding risk prediction results can be automatically output at different stages; meanwhile, the model can still obtain stable and transferable electrocardio characteristic representation under the multi-source and multi-device conditions. The cross-domain and cross-device capability enables the model to stably work in a real multi-center clinical environment, retraining for each medical center is not needed, the deployment difficulty and cost are greatly reduced, and controlled updating can be realized by using a small amount of follow-up visit data without depending on historical original electrocardiogram data and retraining the complete model.

The present invention relates to the technical field of fault diagnosis of hydropower units, and discloses a semi-supervised fault diagnosis system based on TCN network and deep clustering. By designing system function modules, the peak-to-peak value of the vibration signal of the stability measurement point of the hydropower unit and the alarm signal of the unit over-alarm fault are obtained, a data set is constructed and annotated, and the training data is divided into labeled data and unlabeled data; based on the labeled data and unlabeled data after noise reduction, a semi-supervised model is trained through a TCN metric network, deep features in time and space are extracted, and pseudo labels are generated according to the k-means clustering algorithm, and according to the annotated true labels, clustering loss and distribution alignment loss are used as dual loss functions to optimize the model, and a fault diagnosis model is constructed to perform fault diagnosis on the hydropower unit. The present invention improves the accuracy and efficiency of fault diagnosis, reduces the cost and resource requirements in practical applications, and has a wide range of engineering application prospects.

The invention discloses a transplanter transmission mechanism and a transplanter with multiple mechanisms controlled by a single power source, and the transplanter transmission mechanism comprises a driving part which is used for providing a power source and rotating at a constant rotating speed; the first transmission part is used for transmitting the power of the driving part to the movable shovel so as to drive the movable shovel to swing back and forth in a first period; and the second transmission part transmits the power of the driving part to a seedling planting plug, the seedling planting plug is inserted and pulled in a reciprocating mode according to a second period, and the second period is synchronous with the first period. According to the transplanter capable of controlling multiple mechanisms through the single power source, the single power source is adopted, the first transmission part, the second transmission part and the third transmission part are driven simultaneously through the driving rod and the chain wheel, the number of power sources is reduced, and the equipment cost and the maintenance requirement are reduced.

The invention relates to the technical field of sodium ion battery positive electrode materials, in particular to a carbon-coated hydrated sodium manganese oxide material, a preparation method thereof, a positive plate and a sodium ion battery. The method comprises the following steps: mixing a manganese source and an organic carbon source, and carbonizing in an inert atmosphere at 600-1100 DEG C to obtain a first precursor; mixing the first precursor with a sodium source, calcining in an oxygen-containing atmosphere at 250-400 DEG C, and reacting to obtain a second precursor; and soaking the second precursor in water, washing and drying to obtain the carbon-coated hydrated sodium manganese oxide material. And / or mixing a manganese source, a sodium source and an organic carbon source, reacting in an inert atmosphere at 210-280 DEG C, and carbonizing to obtain a carbon-coated sodium manganese oxide precursor; and soaking the carbon-coated sodium manganese oxide precursor in water, washing and drying to obtain the carbon-coated hydrated sodium manganese oxide material. The two methods can weaken the situation that the carbon is oxidized and loses the coating effect, the structure of the sodium manganese oxide is prevented from being damaged, and the process is simple.

The present invention relates to a cover plate bonding structure for a vehicle-mounted display screen, including a cover plate, a TFT module, a first two-component silicone adhesive layer, a second two-component silicone adhesive layer and a mounting frame. The cover plate is fixed by the two-component silicone adhesive, and the temperature shock and mechanical vibration resistance between the cover plate and the mounting frame are increased, so that the reliability of mechanical shock is high. The second two-component silicone adhesive layer fixes the TFT module on the mounting frame. The two-component silicone soft adhesive can achieve reliable bonding at room temperature and within a reasonable process time, and the two-component silicone adhesive has good weather resistance to ensure that the vehicle-mounted product is reliably fixed at ‑40℃~+95℃. The two-component silicone soft adhesive has good flexibility, which can effectively eliminate the assembly error caused by the cumulative size error of each part, as well as the internal stress introduced by the torque difference and deformation when screwing, so as to avoid the deterioration of low light leakage. It takes into account the requirements of narrow black frame of the display screen, the requirements of fixed reliability, the requirements of low light leakage prevention, the requirements of low cost, the requirements of flexible design and the requirements of manufacturing automation.

The invention relates to the field of protective fabrics, in particular to a polyurethane anti-needling fabric and a preparation method thereof. The polyurethane anti-needling fabric comprises base cloth and an anti-needling polyurethane coating arranged on the surface of the base cloth, the thickness of the anti-needling polyurethane coating is 120-180 microns, the anti-needling polyurethane coating is prepared by coating the surface of the base cloth with polyurethane paint and curing the polyurethane paint, and the polyurethane paint comprises the following components in parts by mass: 1-10 parts of polyurethane, 1-10 parts of polyurethane and 1-10 parts of polyurethane. Comprising the following preparation raw materials: 85-90 parts of a modified polyurethane emulsion, 20-25 parts of a modified graphene oxide dispersion liquid, 8-10 parts of modified whisker blended carbon fibers and 5-7 parts of modified nano titanium dioxide. According to the polyurethane anti-needling fabric, a safe, durable, comfortable and environment-friendly high-performance fabric is provided for a user through an innovative formula and process, and the polyurethane anti-needling fabric is particularly suitable for occasions needing high protection performance.

The invention discloses an arc detection circuit and method, the circuit comprises a low-frequency sampling circuit and a high-frequency sampling circuit, and the input end of the circuit is connected with a low-frequency current loop and a high-frequency current loop sleeving a detected cable; the input end of the ADC acquisition circuit is respectively connected with the output ends of the low-frequency sampling circuit and the high-frequency sampling circuit, and analog signals output by the low-frequency sampling circuit and the high-frequency sampling circuit are converted into digital signals; and the MCU is connected with the output end of the ADC acquisition circuit. Through the synergistic effect of the low-frequency acquisition circuit and the high-frequency acquisition circuit, the accuracy and reliability of arc detection are improved, the dynamic adjustment capability of the system is effectively supported, and timely early warning and processing of potential faults are ensured. Through acquisition of a small amount of data and use of a simple fault arc feature extraction method, the operand is effectively reduced, and the requirement for hardware cost is also reduced; the multi-logic cycle judgment enables the fault arc and the switch arc characteristics to be effectively distinguished, and the recognition accuracy is improved.

The utility model discloses a double X -axis engraving and milling machine with double four -axis linkage structure, including by the main part of engraving and milling machine, and in the main part of engraving and milling machine one side sets up the equipment main part of double four -axis station subassembly constitution, double four -axis station subassembly includes parallel alignment and set up's first four -axis main part and second four -axis main part, and is equipped with the docking slide for the cooperation processing product in the processing head opposite side of first four -axis main part and second four -axis main part, and the tail of first four -axis main part and second four -axis main part is connected with linkage subassembly, and linkage subassembly includes the linkage board of two ends respectively with the tail of first four -axis main part and second four -axis main part is connected, and with the vertical connection of linkage board's connecting rod, and the other end of connecting rod is equipped with driving arrangement, and linkage board passes through the cooperation of driving arrangement and connecting rod, makes first four -axis main part and second four -axis main part synchronous action. The utility model has solved the problem that single engraving and milling machine lacks double -shaft station (or more shaft) synchronous processing structure in prior art.