228results about How to "Achieve elimination" patented technology

The invention relates to a battery group discharging control method and a battery group charging control method, and belongs to the technical field of new energy automotive power battery application. Aiming at circular current of a parallel-connected battery group, battery packs are connected in parallel after respectively passing through corresponding relays, on / off of each relay is controlled according to voltage sampling on and the specific state of the corresponding battery pack so as to realize charging and discharging control on the battery packs, battery information is transmitted to a finished automobile through a finished automobile CAN, and the finished automobile makes appropriate power request and restrictions according to information sent by a battery management system so as to eliminate or suppress circular current of the battery packs connected in parallel, ensure the maximum output capacity of the batteries and ensure the safety of the batteries and personnel.

The invention discloses an automation carbon vending machine which is characterized by comprising an equipment cabinet, a main machine system (4), a touch screen (5), a metal keyboard (2), a label printer (6) and a coin collector (1), wherein the main machine system (4) and the label printer (6) are arranged inside the equipment cabinet, a panel in the front of the equipment cabinet is provided with the touch screen (5), the coin collector (1) is arranged inside the machine cabinet, and the inlet of the coin collector (1) is arranged below the touch screen. Each part is connected with a plurality of serial ports of the main machine system (4) through communication cables, and the main machine system (4) is connected with a server through the network. The automation carbon vending machine can calculate carbon discharge quantity of users, account recharge can be conducted in cash mode, batteries can be recovered automatically, models of the recovered batteries can be distinguished, internet communication of battery recovering information and the cash paper money receiving information is achieved, and the processes are in unattended operation.

The invention relates to an energy utilization and environment protection technique and is a method for stable operation of low concentration gas switched catalytic reaction. The low concentration gas switches a catalytic reactor through flow direction to generate catalytic combustion reaction, methane is consumed and simultaneously heat is generated, the temperature range of stable operation of the catalytic reactor is 200 to 600 DEG C. The invention obtains signals through real-time measurement to the concentration of the inlet of reactor and the temperature of the reactor, and the signals are transmitted to a signal processing and control system which compares the signals and optimization reaction operational parameters, then the signals are transmitted to a high concentration coal gas pipe line inlet control system and high temperature heat interchanger control system. When the temperature is in the range of normal operation, the prior operation is maintained; when the temperature strays from the set value, if the temperature is higher, a high temperature heat interchanger is controlled to strengthen heat exchange so as to reduce the temperature of the reactor, if the concentration or the temperature is lower, a valve of high concentration coal gas in a coal mine is opened to maintain fuel concentration so as to make the reaction smoothly progress.

The invention provides a gravity compensation method for mechanical arm load mass and sensor null drift online recognition. The gravity compensation method comprises the steps that S1, a load mass center and mass recognition module is adopted for obtaining and recognizing the mass center and mass of loads at the tail end of a mechanical arm, and the recognized mass center and the recognized mass of the loads are obtained; S2, a sensor null drift recognition module is adopted for reading the numerical value of a sensor, calculation is performed according to the recognized mass center and the recognized mass, and sensor null drift is obtained; and S3, a gravity compensation module is adopted for performing gravity compensation on the numerical value of the sensor according to the sensor null drift. By means of the method, the problem that due to the additional force and torque introduced by the loads of the tail end of the mechanical arm to the tail-end six-dimensional force sensor by the gravity effect and the presence of sensor null drift errors, the numerical value of the sensor is inaccurate and the final force control effect is affected can be solved, and uncertainty of the sensor null drift determines the necessity of online recognition of the sensor null drift.

The invention discloses an adaptive anti-multipath interference photon radio frequency receiving front end and method, belonging to the technical field of microwave photonics. The photon radio frequency receiving front end and method include the following steps: adopting a multi-wavelength laser source and a wavelength division multiplexing structure to obtain a multi-path optical-carrier microwave reference signal, and adopting a controllable optical attenuation array and a controllable optical delay array to respectively perform optical domain delay and amplitude adjustment on the multi-pathreference signal; and adopting an adaptive feedback control loop to monitor the time variation of interference signals, and performing feedback control on the amplitude and delay of the multi-channelreference signal to achieve adaptive and effective suppression of multi-path interference signals. The adaptive anti-multipath interference photon radio frequency receiving front end and method havethe advantages of simple system structure, large bandwidth, high amplitude and delay control accuracy, and good system stability.

The invention relates to a river channel in-situ purification and ecological remediation method which is applicable to elimination of black-odor, water quality improvement and ecological remediation projects of black and odorous river channels with interior sources polluted seriously. The method comprises the steps that river water is pumped out, bottom sludge is insolated, and interior source pollutants are removed through natural oxidation; the insolated bottom sludge is covered with clay, plowing is performed and insolation continues so as to further decrease the interior source pollutants; the insolated bottom sludge is used for building bank slopes to form gentle slopes with a certain slope gradient; insolation continues, and micropore aeration devices are installed at the river bottom; the floating plant technology is applied to the middle of a river channel; after water level recovery, emerged plants are planted on the built gentle slopes, waste water is purified in the flowing process, and the pollutants are removed in situ. Accordingly, in-situ treatment of the bottom sludge and improvement of the water quality in the river channel are realized, the project cost is lowered, and the treatment efficiency is improved.

The invention provides a CO low-temperature oxidation catalyst. The catalyst is characterized in that the catalyst consists of a CeO2-TiO2 compound oxide carrier and an active component of CuO, and the loading capacity of the active component of CuO is 1 to 20 weight percent, wherein the range of the mol ratio of TiO2 to CeO2 is 0.1-4. The coprecipitation method is adopted to prepare the cerium-titanium compound oxide carrier, and a copper nitrate solution is steeped on the carrier. The catalyst prepared by the method has highly efficient catalytic activity, and can realize the complete removal of CO in the temperature range of between 80 and 170 DEG C, and the highest selectivity reaches 100 percent; moreover, the catalyst also has good waterproof and CO2 resistant performances. The method has the advantages of simple preparation conditions, low production cost, and the like.

The invention provides a free scene text detection method based on affine transformation and relates to the field of image processing. According to the free scene text detection method provided by theinvention, MSER (Maximally Stable Extremal Regions) and SWT (Stroke Width Transform) are combined to realize text detection; then a vertex of a peripheral quadrilateral of each character is utilizedand is combined with an inertia principal axis to find out a quadrilateral for reflecting text distortion characteristics, so as to find out an affine parameter to carry out affine transformation; finally, detection of an image text and elimination of distortion are realized. According to the free scene text detection method provided by the invention, the accuracy of the text is remarkably improved; compared with a single text detection method based on a communication region, the recalling rate and the detection efficiency can be improved and automatic affine transformation is carried out; finally, the detection and the elimination of the image text are realized; compared with other manual affine transformation, the working efficiency is greatly improved and OCR (Optical Character Recognition) in the future is more accurate.

The invention discloses a homogenizing method for laser illumination and a laser illumination device. The device comprises a semiconductor laser unit, a homogenizing device and a lens set; the semiconductor laser unit is used for emitting laser for irradiation; the homogenizing device is used for energy distribution homogenization on a vertical plane in the laser transmission direction; the lens set at least comprises a beam expander and a focusing lens which are used for expanding beams and focusing the laser for irradiation; and the device is also provided with a vibrating or rotating device for keeping relative vibration or rotation between at least two of the semiconductor laser unit, the homogenizing device and the lens set, and the vibrating or rotating period of the vibrating or rotating device is smaller than or equal to the time of an electronic shutter of a camera. According to the homogenizing method for laser illumination and the laser illumination device, because the vibrating or rotating homogenizing method and the laser illumination device are adopted, light and dark stripes in images and laser speckles in the images are eliminated.

The invention relates to a haze air pollutant eliminating type air conditioner system which comprises an air conditioner cooling tower spraying type polluted air cleaning and purifying system, a pollutant filtering and adsorbing system, a fan pressurizing and sound eliminating system, a spraying cleaning solution purification processing system and a spraying solution type water source heat pump air conditioner system. The air conditioner cooling tower spraying type polluted air cleaning and purifying system is connected with the pollutant filtering and adsorbing system, the returned spraying solution output end of the air conditioner cooling tower spraying type polluted air cleaning and purifying system and the original solution input end of the air conditioner cooling tower spraying type polluted air cleaning and purifying system are connected with the returned spraying solution input end of the spraying cleaning solution purification processing system and the original solution output end of the spraying cleaning solution purification processing system respectively, and the air conditioner cooling tower spraying type polluted air cleaning and purifying system and the spraying solution water source heat pump air conditioner system conducts coupling heat exchange through a heat exchanger. The pollutant filtering and adsorbing system is connected with the fan pressurizing and sound eliminating system. The haze air pollutant eliminating type air conditioner system can realize summer air conditioner refrigerating of a central air conditioner, in winter, renewable resources can be used for replacing fire coal to conduct heating and heat supplying, haze air pollutants can be cleaned, fossil fuel is saved for people and the effects of treating both symptoms and root causes of haze polluted air are achieved.

The invention provides a method for automatically eliminating wrongly-matched registration points in remote sensing image. The method is characterized by comprising the following steps of: obtaining images; extracting feature points, and building the initial matching relationship; searching K nearest feature points from a set U by an Euclidean space distance method; judging whether a point pair {PixA<0>, PixB<0>} and n feature points around thereof conform to the angle self-consistent requirements or not; and obtaining a common point set U<right> and wrong common points U<wrong> and other steps. After matched point pair sets and feature point description vectors are obtained by performing any feature point extraction and a matching algorithm on two remote sensing images, wrongly-matched feature point pairs can be eliminated by using the method.

The invention provides an intelligent scheduling and control implementation method for deterministic time delay service, and aims to solve the problems that a conventional network cannot realize deterministic time delay service transmission and cannot meet the requirements of cooperative application on the upper bound of deterministic time delay jitter. According to the method, a time delay service and an end-to-end time delay demand are determined through configuration of a forwarding equipment management plane in a network, an identifier and timestamp information of a deterministic time delay service during transmission are defined, a network node selects a forwarding path and a sending time slice for the deterministic service based on the time delay demand and a clock stamp, and end-to-end deterministic time delay is realized. The network node adjusts the number of forwarding queues and scheduling period parameters according to the forwarding condition of the deterministic time delay service, adapts to the transmission of the deterministic time delay service, and improves the overall transmission performance. Besides, a reliable and sequential transmission mechanism for the determined time delay service is realized through the serial number of the data packet, reliable transmission is realized through packet-by-packet confirmation, packet loss and overtime feedback mechanisms, and the copy and elimination of the deterministic time delay service are realized.

The invention relates to a full-automatic vacuum molding control system and a method. The system comprises a detection module, a control module and an execution module, wherein the control module comprises a computer as a main controller and a programmable logic controller as a secondary controller, the detection module comprises a CCD (Charge-Coupled Device) high-speed digital camera, a digital pressure sensor and a limit switch, the execution module comprises a vacuum pump connected with a vacuumizing motor, a stirring rod connected with a stirring motor, and a firming agent material cup and a mixed material cup connected with a tilted motor as well as an electromagnetic valve for air intake. The control method realizes visual, automatic and intelligent control of the vacuum molding process. The invention can greatly save the labor resource cost and improve the molding working efficiency and the product quality.

The invention discloses an air-air heat exchange device for defogging and water condensing of a cooling tower. The air-air heat exchange device is simple in structure, good in defogging and water condensing effect and capable of being popularized. An axial flow fan, a gradual expansion channel and an air-air heat exchanger are sequentially arranged in the dry cold air flowing direction. The axial flow fan is used for guaranteeing the dry cold air flow and overcoming runner resistance. The gradual expansion channel is used for connecting the axial flow fan with a dry cold air inlet of the air-air heat exchanger. The air-air heat exchanger is composed of dry cold air runners and wet-hot air runners and used for increasing the heat exchange area of dividing wall heat exchange, enhancing mixing of dry cold air and wet-hot air and promoting liquid water in wet-hot air in the cooling tower to be condensed. Each of the dry cold air runners and the wet air channels of the air-air heat exchanger are formed by arranging heat exchange plates at intervals, the sections of the side faces of the heat exchange plates are in a folded line shape or a wave shape, and rectangular holes are formed in the upper portions of the dry cold channels.

The invention provides an audio information acquisition device and an audio information acquisition method. The audio information acquisition device mainly comprises at least one audio information acquisition unit, a first interface unit and an audio information processing unit, wherein the audio information acquisition unit is used for collecting first voice information at least comprising first voice information sent out by a user as well as second sub voice information output by a voice play unit, the first interface unit is used for receiving a second audio signal which is output by first electronic equipment to the voice display unit and is corresponding to the second sub voice information, the audio information processing unit is used for processing the first voice information based on the second audio signal to obtain second voice information, so that the voice of a loud speaker can be eliminated or reduced effectively when the voice information comprises the voice of the loud speaker, therefore, the identification accuracy of the audio information acquisition device on the voice information is improved, and the audio information acquisition device can also precisely determine the voice of a user.

The invention discloses a high-pressure ball valve sealed by inflatable type flexible sealing rings arranged inside valve seats. The high-pressure ball valve comprises valve covers, a valve body, a supporting shaft, a ball body, end covers, the valve seats, the inflatable type flexible sealing rings, a valve rod, a stuffing box, fillers and a gland; an inner ring sealing sphere of each valve seat clings to the surface of the ball body to form a first sealing structure; each inflatable type flexible sealing ring inflated at an annular opening clings to the surface of the ball body to form a second sealing structure. According to the high-pressure ball valve sealed by inflatable type flexible sealing rings arranged inside valve seats, by controlling the inflation of the inflatable type flexible sealing rings, construction and elimination of the second sealing structure can be realized; abrasion of a sealing surface between the valve seats and the ball body, caused by rotation of the ball body, can be greatly reduced; meanwhile, the sealing surface of each valve seat is ensured to always cling to the sphere completely to guarantee the sealing effect.

The invention discloses a vehicle movement shadow eliminating method which includes: pre-treating an original color image (a), obtaining marginal information of the obtained color image (f), conducting vertical operation and horizontal operation to a primary image (i) of the color image (f) after being disposed of a majority of outer contour margins, conducting connected region marking of a first secondary image (j) and a second secondary image (k) which are obtained from elimination of residual outer contour margins, respectively conducting pixel-by-pixel phase between the obtained first result image (l), a second result image (m) and the primary image (i), conducting vehicle reconstruction for the obtained phase result image (n) to generate a blob block corresponding to the original color image (a), and inputting the blob block to a corresponding binary image according to coordinate position of the original color image (a). Due to the fact that vehicle marginal information is rich and marginal information is insensitive to change of illumination variation, the vehicle movement shadow eliminating method has the advantages of being good in universal applicability and good in completeness of the eliminated shadow portion.

The invention discloses a wireless receiver and a method for eliminating the DC offset in the wireless receiver. The wireless receiver comprises a buffer module, a comparison module and a control module, wherein the buffer module is a part of the circuit of the wireless receiver and is used for receiving the outputs IN plus and IN minus from a prior programmable gain amplifier and outputting VI plus and VI minus to the input of the ADC in a baseband processing chip after buffing treatment and voltage division by a variable-load resistor; the comparison module is specifically used for calibration and is used for comparing the difference of the received outputs VI plus and VI minus from the buffer module, outputting the high electrical level when the VI plus is larger than the VI plus and outputting the low electrical level when the VI plus is smaller than the VI minus; and the control module regulates the resistance of the variable-load resistor in the buffer module according to the output level from the comparison module, so as to reduce the difference in DC common-mode voltage between the output VI plus and the output VI minus from the buffer module.

The invention relates to a self-interference-elimination method, in particular to a self-interference-elimination method of an equal-frequency simultaneous full-duplex system based on interleave and iterative decoding. The problem that in the prior art, data transfer speed and frequency spectrum using efficiency do not meet the highest requirements, and signals sent by a sending antenna in the prior art can have great self-interference on a receiving antenna at the same node is solved. Assuming that information sequences sent by two nodes are d1 and d2 respectively, after coding, c1 and c2 are formed, then interleavers pi1 and pi2 which are independent and random are used on the nodes, c1 and c2 are subjected to interleaving to form x1 and x2, x1 and x2 are subjected to modulation and then are sent out through channel sending ends, channel receiving ends carry out iterative decoding chip by chip, and useful signals are obtained. The method is used in the field of a next-generation wireless communication system (5G).

The invention relates to a GNSS anti-spoofing method, in particular to a steady GNSS anti-spoofing method based on particle filter. The steady GNSS anti-spoofing method based on particle filter mainly solves the problem that deceptive satellites offset and cannot resist transmitting spoofing, and high cost is caused by the fact that the anti-spoofing method cannot be applied to the existing system. The steady GNSS anti-spoofing method comprises the steps of 1, obtaining state vector particles at 1 moment; 2, updating state vector particles at K moment; 3, obtaining observation pseudorange rho^n,k; 4, updating an observation vector yk<m>; 5, calculating out unnormalized particle weight Wk<m>; 6, calculating out the minimum value theta of the module value of the observation vector yk<m>; 7, modifying the yk<m> according to the formula seen in the specifications; 8, calculating out a positioning result X^k<MMS> at K moment; 9, obtaining the number Meff of the rest of effective vector particles; 10, calculating out W-k<m> according to the formula seen in the specifications; 11, taking Xk+1<m> into the step 2 to achieve the formula seen in the specifications. The steady GNSS anti-spoofing method based on particle filter is applied to the GNSS anti-spoofing field.

The invention relates to the technical field of building devices, in particular to a wall perforating device with a dust collection function. The wall perforating device comprises a workbench, a lifting mechanism, a perforating machine and a stabilizing mechanism. The lifting mechanism is fixedly mounted on the workbench. A mounting plate is fixedly arranged at the output end of the lifting mechanism. Connecting plates are further fixedly arranged on the two sides of the mounting plate correspondingly. The stabilizing mechanism is fixedly mounted on the connecting plates. A mounting box is fixedly arranged on the mounting plate. An opening is formed in the left side of the mounting box. A hood is fixedly arranged on the opening. The perforating machine is fixedly mounted in the mounting box. A dust collection box is further arranged on the workbench. A suction blower is mounted on the side portion of the dust collection box. A dust suction hose communicating with the hood is arranged on the dust collection box. The side portion of the dust collection box is further provided with a water conveying pipeline stretching into the dust collection box. A universal sprayer is mounted at the end, located in the dust collection box, of the water conveying pipeline. The wall perforating device can be used for suppressing dust during perforating, the environment is purified, and the humanhealth is protected.

The invention discloses an image retrieval ranking method and device. The method comprises the steps: searching a network image database to obtain image sets corresponding to keywords according to the keywords input by a user, and causing the image sets to be subjected to denoising processing in a characteristic clustering way respectively to obtain corresponding cluster-oriented image sets; causing the cluster-oriented image sets and other cluster-oriented image sets already established in the network image database to be subjected to inter-cluster optimizing processing in a paired way and causing images in the cluster-oriented image sets to be subjected to secondary denoising processing to obtain optimized image sets; causing the optimized image sets to be subjected to weighting computation to obtain high density image sets according to the confidence fraction, and ranking the high density image sets according to a linear ranking model to obtain an image ranking result. The device comprises a clustering denoising module, an inter-cluster optimizing module and a ranking module. The retrieval ranking precision is improved through three-layer retrieval ranking.

The invention discloses a method for wet cleaning after dry etching of an aluminum wire. The method comprises a first step of pre-treating the surface of a wafer with deionized water, reacting the deionized water with the aluminum chloride remained in a polymer after dry etching and forming aluminum hydroxide and chlorine, pumping out chlorine in a cleaning machine with the exhaust air, and thus removing the CL element; a second step of performing wet cleaning on the pre-treated wafer by using of a fluorine-based chemical solution including NH4F to remove the polymer produced by dry etching onthe wafer, and reacting NH4F with the aluminum hydroxide produced in the first step to form NH4ALF4; and a third step of post-treating the surface of the wafer with deionized water, and using the deionized water to dissolve NH4ALF4 so as to remove the F element, so that the anti-corrosion immunity of the wafer aluminum wire is improved by removing the CL element and the F element. The method in the invention can improve the anti-corrosion immunity of aluminum.

The invention discloses a novel modularized photovoltaic grid-connected system based on a three-port power channel and a control method. The system comprises a front-stage three-port isolation type DC / DC photovoltaic converter, a rear-stage three-phase half-bridge cascade MMC and a combination thereof. The front-stage three-port DC / DC converter adopts a three-winding high-frequency transformer for isolation, an input port is connected with a photovoltaic array, and two output ports are respectively connected to two sub-modules of upper and lower bridge arms of each phase unit of the MMC. The half-bridge cascade structure of the MMC enables the output voltage to be the superposition of the output voltage of each sub-module, and the output current harmonic wave is greatly reduced through carrier phase-shifting modulation, so that the MMC can be directly connected with a medium-voltage AC power grid and a medium-voltage DC power grid. According to the topology, through power decoupling control, the capacity of a power decoupling capacitor can be reduced by dozens of times, and the size of a system is greatly reduced. In addition, the photovoltaic power among the topological phase units is balanced in the form of direct-current circulating current through a direct-current link, so that the problem of mismatch of the photovoltaic power is well solved.

The invention discloses an OCC (orthogonal complementary code) UWB (ultra wide band) system interference suppression method based on Chirp pulse, which belongs to the field of wireless communication. The system comprises an emitting node and a destination terminal. The method disclosed by the invention aims to design a parallel OCC UWB system based on Chirp pulse; the method comprises the following steps: firstly, representing the message of each data bit at the emitting node by low-complexity orthogonal Chirp code, so as to reduce the complexity of the emitting node; and secondly, enabling the destination terminal to easily extract the element code of various users by using the orthogonal characteristic of the orthogonal Chirp code. In the method, directing at the OCC UWB communication system, the parallel transmission method is used and the low-complexity orthogonal Chirp code is introduced to transmit the data bit message, therefore the multi-user wireless communication can be realized, and meanwhile the interference suppression property and the communication property of the system are improved.

The invention relates to the optical fiber F-P sensor vibration signal demodulation system based on polarization switching and a demodulation method, belonging to the optical fiber sensing and the signal demodulation field. The device consists of a wide spectrum light source, a polarization-preserving fiber grating, a polarization-preserving circulator, a polarization-preserving er-doped optical fiber amplifier, an electro-optical modulator, a signal generator, an analyzer, a circulator, an electro-optical modulator, a high speed data collection card, a computer, a power amplifier, a vibration table and an optical fiber F-P sensor. The invention overcomes the problem that the optical path is imbalance in the traditional dual-wavelength demodulation system and realizes two-path interference signal demodulation on same light source, the photoelectric detector and on the same light path. In the mean time, the invention provides a two-path signal demodulation method combining an ellipse fitting alogrithm and a differential cross multiplication algorithm. The two-path signal demodulation method can effectively avoid the inaccuracy of the demodulation system which is caused by the F-P sensor cavity long manufacture technology.

The invention relates to the technical field of sterilization and disinfection equipment, in particular to an ultraviolet pulse sterilization, disinfection and purification all-in-one machine, a sterilization and purification method and a computer readable storage medium. The ultraviolet pulse sterilization, disinfection and purification all-in-one machine comprises a machine body and a disinfection bin arranged in the machine body; a filtering and purifying chamber is arranged in the machine body, a disinfection suction inlet and a disinfection outlet which communicate with the filtering andpurifying chamber are formed in the disinfection bin, and an air inlet and an air outlet which communicate with the filtering and purifying chamber are formed in the machine body; a xenon ultravioletlamp and a circulating air mechanism are arranged in the disinfection bin, and a dust filtering device is arranged in the filtering and purifying chamber; and the ultraviolet pulse sterilization, disinfection and purification all-in-one machine further comprises a boosting module and a trigger which are electrically connected with the xenon ultraviolet lamp separately. Through the ultraviolet pulse sterilization, disinfection and purification all-in-one machine, sterilization and disinfection can be performed on air, the air is purified, and man-machine coexistence can be achieved.

The invention provides a landfill leachate biochemical effluent treatment reactor and method and relates to the technical field of sewage treatment, aiming at solving the technical problem that COD (Chemical Oxygen Demand) and TN (Total Nitrogen) in landfill leachate biochemical effluent cannot be removed at the same time. The landfill leachate biochemical effluent treatment reactor comprises an electrochemical flocculation device for adsorbing macromolecular difficult-to-degrade organic matters to form reducing sludge and transforming nitrate nitrogen into ammonia nitrogen, an electrochemicaloxidization device for generating effective chlorine and eliminating the effective chlorine to react with the ammonia nitrogen to eliminate the ammonia nitrogen, and a first pump, wherein the electrochemical flocculation device is provided with a first solution outlet and a first sludge outlet; the electrochemical oxidization device is provided with a first solution inlet; an inlet and an outletof the first pump are correspondingly connected and communicated with the first solution outlet and the first solution inlet respectively; the reducing sludge flows out from the first sludge outlet.

The invention relates to the field of pipe fitting manufacturing, in particular to a water-hammer arrestor. The water-hammer arrestor comprises a buffer tube body (1), a compressed air line (2), a pressure sensor (4), a high liquid-level sensor (5), a low liquid-level sensor (6), a drainage pipeline (7), and a buffer tube opening (9); one end of the buffer tube body (1) is provided with a blind tube of the buffer tube opening (9), and the closed end of the buffer tube body (1) is provided with the compressed air line (2) and the pressure sensor (4); and one position, close to the closed end, of the buffer tube body (1) is provided with the high liquid-level sensor (5), and one end, close to the buffer tube opening (9), of the buffer tube body (1) is provided with the low liquid-level sensor (6) and the drainage pipeline (7). Compared with the prior art, the water-hammer arrestor is simple in structure, low in cost, and convenient to use; and the water-hammer arrestor has good removingeffect, no maintenance is required, and the practicability is wide.