115results about How to "Easy to exclude" patented technology

The invention relates to the technical field of nano ceramic materials, and discloses a high-strength nano aluminum oxide ceramic product and a preparation process thereof.The preparation process comprises the following preparation steps that aluminum oxide powder, a composite binder, composite gel, a plasticizer and a solvent are mixed and subjected to ball milling, and composite slurry is obtained; placing the composite slurry in a mold, and performing mold pressing and drying to obtain a green body; and putting the green body into a high-temperature sintering furnace, carrying out high-temperature sintering, and cooling to room temperature to obtain the nano aluminum oxide ceramic product. Nano zirconium oxide and nano magnesium oxide are formed on the surfaces of the pretreated silicon carbide whiskers, and can form a solid solution with nano aluminum oxide in the sintering process to serve as a bridge of the silicon carbide whiskers and nano aluminum oxide particles, so that the binding force of the silicon carbide whiskers in a nano aluminum oxide ceramic matrix is remarkably enhanced; phosphoric acid and aluminum ammonium sulfate are firmly combined on the surfaces of nanometer aluminum oxide particles through carboxymethyl cellulose, and the situation that phosphoric acid and aluminum ammonium sulfate are not firmly combined with the nanometer aluminum oxide particles is avoided.

The invention relates to a device for reducing the moisture loss rate of express parcels based on big data analysis, and the device comprises a logistics moisture loss analysis platform which comprises a real-time processing module which is used for obtaining real-time weather data and real-time order information; the logistics moisture loss management end is used for starting the moisture loss prediction module when the real-time weather data reach a preset weather threshold value, and the moisture loss prediction module is used for processing the real-time weather data and the real-time order information, generating a moisture loss prediction result and sending the moisture loss prediction result to the logistics moisture loss management end; and the query module is connected with the logistics moisture loss management terminal and is used for querying the moisture loss prediction result, so that a risk elimination principal carries out risk elimination on the express parcel according to the moisture loss prediction result. According to the device, a risk elimination responsible person can obtain the moisture loss prediction result, risk elimination is carried out on the express parcel, moisture loss of the parcel is avoided in advance, and the moisture loss rate of the express parcel is effectively reduced.

The ultrasonic vacuum filling and sealing machine comprises a machine body, a filling and sealing box is arranged on one side of the upper surface of the machine body, a guide seat is arranged on the other side of the upper surface of the machine body, and a box opening for a power container to pass through is formed in the side, close to the guide seat, of the filling and sealing box. A filling and sealing gun vertically extending downwards is arranged in the center of the inner top wall of the filling and sealing box, and an ultrasonic generator and an electric heater are installed at the positions, located on the periphery of the filling and sealing gun, of the inner top wall of the filling and sealing box. Ultrasonic energy generated by working of the ultrasonic generator can change the fluidity and viscosity of a pouring material, promote permeation and filling of the pouring material, reduce bubbles and improve the uniformity of the pouring material, heat is generated by electrifying the electric heater, the pouring material is heated and subjected to heat preservation, premature cooling of the pouring material is avoided, pouring material forming is facilitated, and the production efficiency is improved. The automatic feeding and discharging device can replace traditional manpower for automatic feeding and discharging of capacitors, time and labor are saved, the feeding and discharging speed is high, and the capacitor pouring machining efficiency is improved.

The embodiment of the invention relates to the technical field of electromagnetic wave sensors, and discloses a target detection method, an integrated circuit, a sensor and equipment. The target detection method comprises the following steps: carrying out distance dimension FFT (Fast Fourier Transform) on frame data; extracting target data from the frame data obtained after the distance dimension FFT processing; windowing the target data according to a sliding window, and performing digital signal processing on the windowed data; wherein the duration, corresponding to the length of the sliding window, of the same order of magnitude as the period of the periodic motion of the target. Through a multi-frame joint processing technology, a scheme of target detection in space areas such as an automobile cabin, a room and a factory building is realized, the detection rate can be effectively improved, the false alarm target number is reduced, and meanwhile, the angle estimation accuracy can be greatly improved. Therefore, special targets or weak targets such as infants and the like in the cabin can be accurately detected, and applications such as CPD and SBR are realized.

The invention provides a slurry pump front protective plate and a preparation method thereof, and belongs to the technical field of casting of rock breaking slurry pump front protective plates, and the preparation method comprises the following steps: step 1) preparing a prefabricated body; the prefabricated body is a ceramic prefabricated body, and the flowing speed of molten metal can be increased; (2) the prefabricated body is placed in a slurry pump front protection plate mold, then molten metal is poured into the slurry pump front protection plate mold, the slurry pump front protection plate mold is filled with the molten metal, meanwhile, the prefabricated body is wrapped, the molten metal is infiltrated into a set structure of the prefabricated body, and a front protection plate rough blank is obtained; wherein the molten metal is molten metal of a high-hardness wear-resistant alloy; and (3) carrying out heat treatment and processing on the rough blank of the front guard plate to obtain the front guard plate of the slurry pump. The ceramic preform of the spiral structure is high in hardness and strength, cracks cannot penetrate through the ceramic, meanwhile, metallurgical bonding exists between the high-hardness wear-resistant alloy matrix and the ceramic during pouring, the bonding force is large, crack propagation of high-hardness alloy cracking can be resisted, and the fracture toughness of the front protection plate is improved.

The invention discloses a fuel cell gas diffusion layer containing a wave channel, and a preparation method and application thereof. The preparation method comprises the following steps: cutting a substrate layer material and designing the wave channel; the substrate layer material is placed on a laser etching adsorption platform, laser etching is conducted on the first surface of the substrate layer material, a wave channel is obtained, and the extending direction of the wave channel is parallel to the length direction of the substrate layer material; carrying out hydrophobic treatment on the substrate layer material containing the wave channel; then mixing and stirring conductive carbon black, a binder, an emulsion and water to obtain microporous layer slurry; and finally, spraying the microporous layer slurry on the second surface of the substrate layer material, and then drying, thermally treating and curing the substrate layer material to obtain the fuel cell gas diffusion layer containing the wave channels. According to the fuel cell gas diffusion layer containing the wave channels, the mass transfer rate can be increased, transmission and supply of hydrogen and oxygen in air are improved, generated water is effectively discharged, and aggregation of liquid water in the flow channels is reduced.

The utility model belongs to the technical field of gas treatment, and provides a hot-pressing gas treatment device which comprises a filter barrel and a first filter assembly. By starting the air exhauster, dust and harmful gas generated in the hot press can enter the filtering barrel through the air inlet pipe and then enter the exhaust pipe through the dust filtering net cover, at the moment, the dust filtering net cover can filter the dust, and when the dust filtering net cover needs to be cleaned, the dust filtering net cover can be cleaned. The driving assembly is adjusted to drive the cleaning brush rod to rotate around the dust filter screen cover, dust attached to the peripheral side and the bottom end of the dust filter screen cover can be brushed away through rotation of the cleaning brush rod, and therefore the phenomenon that the dust filter screen cover is blocked is avoided, the dust filter screen cover can be cleaned without disassembling the dust filter screen cover, and the dust filter screen cover is convenient to clean; the convenience in use of the device is improved, the brushed dust can fall and accumulate at the conical slag discharge port, and the dust can be discharged out of the filter barrel by opening a valve on the conical slag discharge port, so that the dust is convenient to discharge.

The invention relates to a communication fault monitoring and passive meter reading system and method based on an electric meter communication module. The method comprises the following steps: step 1, inserting a pin header at an interface of an intelligent electric meter and a communication module, and leading out weak current terminals of the intelligent electric meter and the communication module to an adapter plate; 2, connecting the isolation boosting device 1 to the adapter plate, and supplying power by using an isolation power supply; step 3, switching communication signals RXD and TXD led out from a carrier line communication port to a voltage boosting chip; 4, connecting the boosted communication port to an HPLC carrier communication port and a TTL communication port in parallel; step 5, supplying nominal voltage to the intelligent electric meter, enabling the simulation master station to communicate with the intelligent electric meter, monitoring communication data by a TTL module through a common serial port, and recording the data to a memory; and step 6, performing continuous communication on the carrier module and the TTL module through the communication upper computer, observing a communication result, and performing judgment and data analysis.

The utility model discloses a range hood air guide ring heating deoiling device and belongs to the technical field of range hoods. According to the range hood, the heating ring is arranged on the smoke exhaust volute, sucked oil gas can be heated, the fluidity of the heated oil gas can be improved, so that the oil gas can be discharged out of the range hood more smoothly, meanwhile, the heated oil gas can soften oil dirt attached to the impeller, the impeller can throw away the attached oil dirt conveniently through centrifugal force, and the oil dirt can be discharged out of the range hood more smoothly. The efficiency of the range hood is improved; the two temperature control sensors are arranged on the heating ring, the temperature of the heating ring can be effectively controlled through the arrangement of the temperature control sensors, and danger caused by the fact that the temperature of the heating ring is too high is avoided.

The present invention discloses a fault self-diagnosis diesel locomotive integrated display screen, including: a main control module, a communication module, a power control module, a data storage module, a satellite positioning module, a reconnection module, and a fault self-diagnosis diesel locomotive integrated display screen; the main control module is used for the operation and control of the display screen; the communication module is used for information interaction with other devices; the power control module is used for power supply control, intelligent monitoring, ID identification, digital quantity input and output; the data storage module is used for storing data; the satellite positioning module is used to determine the locomotive position and speed; the reconnection module is used for reconnection information interaction with the locomotive. The present invention can replace the commonly used driver console switches, instruments, indicator lights and locomotive display screens, making the console surface more concise; it can perform fault self-diagnosis functions, and through real-time collection and data comparison, accurately diagnose and predict faults on the locomotive display screen itself, so that users can eliminate and solve faults in advance.

The present invention discloses an annular cutter disc including a cutter holder body and a cutter disc assembly arranged on the cutter holder body; the cutter disc assembly includes an inner cutter disc, an outer cutter disc, a first telescopic member and a second telescopic member; the present invention adopts the form of an inner cutter disc and an outer cutter disc, and the cutter disc can be changed in diameter through the telescopic action of the second telescopic member to achieve graded excavation, and the excavated annular groove can provide space for the pipe segment to enter the rock. The present invention also discloses a tunneling system, and the present invention drives the annular cutter disc to construct underground through a driving body, thereby improving construction efficiency and safety. The present invention also discloses a tunneling method, and the tunneling method of the present invention can be applied to the working conditions when soft soil or soft rock is converted to hard rock formations. The present invention adopts the form of graded excavation, and the outer cutter disc expands the annular groove to the outer diameter of the pipe segment, which is convenient for the pipe segment to sink into the rock to ensure the orderly progress of the construction; concrete and pipe segments are used for sealing and water stopping, creating favorable conditions for subsequent excavation.

The present invention discloses an indoor air purification system capable of achieving temperature difference complementation, and relates to the technical field of air purification. The present invention comprises a purification box, wherein a middle vertical plate is fixedly installed in the purification box, wherein two ventilation components are installed in the purification box, and the two ventilation components are symmetrically arranged, wherein the ventilation component comprises a middle horizontal plate fixedly installed between the middle vertical plate and the purification box, and two air intake pipes and two side plates are fixedly installed between the middle horizontal plate and the purification box, and each air intake pipe is installed with a de-impurity mechanism. The advantages are: the present invention can automatically realize the intercommunication of indoor and outdoor air according to the changes in indoor and outdoor temperatures, automatically realize the replacement purification of air and the complementation of temperature according to the temperature, and can better remove impurities in the air, and can also regularly process the removed impurities to avoid accumulation and blockage, and avoid affecting the purification efficiency, with a high degree of automation and a good purification effect.

The present application relates to the field of wireless signal processing technology, and in particular to an IQ data packet anomaly detection method, device, equipment and storage medium, wherein the method comprises: collecting data from an IQ data packet based on a preset sampling data structure to obtain an IQ sample; determining whether the number of samples of the IQ sample is a preset number of samples, and the preset number of samples is preset based on the sampling data structure; if so, obtaining the sample value of the IQ sample, and determining whether the sample value exceeds a preset value range; if so, determining that the IQ data packet is abnormal. The present application facilitates the AOA base station to output normal electronic price tag location information.

The utility model relates to the technical field of wastewater treatment equipment, and discloses plastic processing wastewater treatment equipment which comprises a shell, a motor is fixedly connected to the interior of the shell, a first rotating shaft is fixedly connected to the output end of the motor, and a first belt wheel is fixedly connected to the outer side of the first rotating shaft; and the right side of the shell is fixedly connected with two supporting blocks, the interiors of the two supporting blocks are rotationally connected with a second rotating shaft, and the outer side of the second rotating shaft is fixedly connected with a second belt wheel. The treatment equipment for the plastic processing wastewater has the advantages of being good in screening effect and the like, and the problem that the plastic processing wastewater contains a large number of particles, but most of existing plastic processing equipment enables the particles to float to the water surface through an additive, so that the particles cannot be filtered is solved. And the problem that the quality of a finished product is reduced due to the fact that a small part of particles cannot be cleaned in the treatment mode that scraping is conducted through a putty machine, and after treatment water is recycled, the plastic is doped with impurities in the machining process is solved.

The utility model belongs to the field of carbonization equipment, and particularly relates to a kiln smoke buffering device. Which comprises a buffer tank provided with a flue gas inlet and a flue gas outlet, and is characterized by further comprising at least two flue gas guide pipes, the front ends of the flue gas guide pipes are communicated to the flue gas outlet, and the tail ends of the flue gas guide pipes are communicated to the two sides of a combustion chamber respectively. Liquid components such as tar can be condensed in the buffer pipe and can be conveniently collected and discharged, the smoke guide pipes arranged on the two sides of the combustion chamber enter the combustion chamber and then form vortex through hedging, and combustion is more sufficient.

The present invention relates to the technical field of material transfer devices, and mainly to a semi-solid material rapid transfer machine. The technical scheme is as follows: a semi-solid material rapid transfer machine comprises a material collection cylinder, and a material discharge port is arranged at the bottom of the material collection cylinder; a pressure cover is arranged inside the material collection cylinder, and the shape of the lower surface of the pressure cover is the same as the shape of the upper surface of the bottom of the material collection cylinder, and an inflatable elastic sleeve is arranged on the lower side of the pressure cover. The present invention provides a semi-solid material rapid transfer machine that can improve the cylinder cleaning rate during transfer.

The utility model relates to the technical field of feeding pump combination installation, in particular to a sludge dewatering feeding pump convenient to combine and install, which comprises a base plate, a feeding pump arranged on the upper surface of the base plate close to the left end, a fixing seat arranged in the middle of a U-shaped plate, a dewatering cylinder arranged on the upper surface of the fixing seat, and an auger blade arranged in the middle of the dewatering cylinder. The auger blade is connected with the rotating shaft through a connecting shaft, a filter cartridge is further arranged on the inner wall of the dewatering cylinder, and a connecting cover is arranged at the right end of the dewatering cylinder; according to the sludge dewatering feeding pump convenient to combine and mount, the feeding pump is fixedly connected with the base plate under the cooperation of screws, and fastening bolts penetrate through penetrating holes and are in threaded connection with threaded holes, so that the fixed seat is convenient to combine, mount and use, auger blades are convenient to mount, and continuous rotation is convenient to push sludge; sludge and water are separated and filtered under the cooperation of the filter cartridge, a mixture of sludge and water is convenient to convey through the installation of the feed pipe, and filtered water is convenient to discharge under the cooperation of the drain pipe.

The utility model relates to the technical field of electrostatic powder spraying, in particular to spraying equipment convenient for adding electrostatic powder, which comprises a storage box, a cover plate is mounted at the top of the storage box in a contact manner, a supplementing box is mounted at the bottom of the cover plate in a contact manner, and a conical plate is mounted at the bottom of the supplementing box in a contact manner. When powder is added into the material storage box, the sealing strip enters the sealing groove, the material storage box is sealed by the cover plate, the powder is prevented from floating out of the top of the material storage box, a worker rotates the material supplementing box by 90 degrees, the telescopic end of the electric telescopic rod is shortened, and then the stop block and the conical plate are extruded and driven to move downwards; powder in the material supplementing box is supplemented to the material storage box from the bottom of the material supplementing box, the conical design of the top of the conical plate is beneficial for completely discharging the powder in the material supplementing box, sealing is conducted firstly, then materials are supplemented, powder cannot fly out of the top of the material storage box, material waste cannot be caused, and it can be guaranteed that the working environment of workers is safe.

The utility model discloses a glass pipette support, including first cylinder and second cylinder, first cylinder and second cylinder fixed mounting at the top of bottom plate, the inside vertical of second cylinder is provided with threaded rod, one end of threaded rod is rotatedly connected with the bottom of second cylinder inside through bearing seat, the other end of threaded rod penetrates the top of second cylinder and is fixedly connected with handle of rotating, the vertical of threaded rod penetrates one end of cross bar, the other end of cross bar is vertically penetrated by guide rod, the both ends of cross bar are respectively seted up and are used for with the threaded hole of threaded rod screw connection and the through -hole of being used for guide rod penetration, one end of guide rod is fixedly installed at the top of first cylinder inside, the other end of guide rod is fixedly installed at the bottom of first cylinder inside, through rotating handle, handle drives threaded rod to rotate, further drives cross bar to move up and down, realizes to the fixed pipette, and it is convenient for medical staff to store pipette.

This invention relates to the field of fault early warning technology and discloses a fault early warning system for desalination in saline soil areas based on multi-source data. The system includes a preprocessing module, a prediction module, a working condition monitoring module, a display module, and an optional fault location module for extended functions. The system predicts crystallization risk by monitoring multi-source parameters such as temperature, flow rate, concentration, and pressure head within the desalination pipe, and issues anomaly warnings before a fault occurs. This overcomes the shortcomings of existing technologies that cannot effectively monitor crystallization risk within the desalination pipe, and is of great significance for ensuring the reliable operation of the desalination system and the long-term stability of saline soil subgrades.

The invention provides lithium-based ceramic pre-sintered powder and a preparation method thereof. The method comprises the following steps: S1, providing raw materials according to the stoichiometric ratio of lithium-based ceramic; s2, mixing the raw materials with an alcohol solvent, and grinding to obtain slurry; and S3, drying the slurry, and directly carrying out pre-sintering treatment to obtain the lithium-based ceramic pre-sintered powder. The lithium-based ceramic pre-sintered powder obtained by the method is fine and uniform in crystal grain, good in dispersity and good in sintering activity.

This invention relates to the field of soil monitoring technology, specifically to a method, equipment, and system for determining the physicochemical properties of terraced soil. The method involves acquiring spectral data from various monitoring points in the terraced fields at different times and in both in-situ and experimental environments. Given the spatial heterogeneity of the physicochemical properties of terraced soils, the method analyzes the intensity differences and similarities of spectral peaks at different monitoring points under each environment, determining similarity indicators and clustering them to obtain clusters. Since soil nutrient changes are reflected in the spectral data, the method analyzes the fluctuation characteristics of spectral peak differences at different times within each cluster under each environment to determine soil nutrient fluctuation indicators. Because the experimental environment is relatively controllable, a target straight line is fitted based on the experimental data as a reference for in-situ spectral correction. Finally, by combining the differences and numerical characteristics of soil nutrient fluctuation indicators at monitoring points within the clusters under in-situ conditions, in-situ environmental parameters, in-situ spectra, and the target straight line, the in-situ spectrum is corrected, thereby improving the accuracy of soil nutrient element determination.

The utility model provides a hermetia illucens incubator which comprises a shell and a plurality of supporting legs, the supporting legs are fixedly arranged at the bottom of the shell, a heating piece is arranged on the shell, a water storage cavity is formed in the bottom of the inner side of the shell, a ventilation cavity is communicated with the upper portion of the water storage cavity, and the ventilation cavity is communicated with the heating piece. A supporting piece used for supporting egg boxes to be placed is arranged between the water storage cavity and the ventilation cavity, a separating assembly used for separating the egg boxes is arranged above the containing piece, a mounting plate is hinged to the top of the shell, and a lighting piece used for providing light for the interior of the shell is arranged on the mounting plate. The device has the advantages that the internal temperature and humidity are adjusted, and hatching of eggs and seedlings is facilitated.

The invention discloses a display panel, a display device and a light sensing method of the display panel. The display panel includes: a substrate; the photosensitive component is arranged on one side of the substrate; the light adjusting layer is arranged on the side, away from the substrate, of the photosensitive component and provided with a first adjusting part, the orthographic projection of the first adjusting part on the substrate and the orthographic projection of the photosensitive component on the substrate are at least partially overlapped, and the first adjusting part has a first state and a second state; the light transmittance of the first adjusting part in the first state is greater than that of the first adjusting part in the second state; the control assembly is in control connection with the first adjusting part, and the control assembly is used for controlling the first adjusting part to be switched between the first state and the second state; and the acquisition circuit is connected with the photosensitive component. The display panel provided by the embodiment of the invention can have relatively good photosensitive precision.

The utility model discloses a cantilever long rod member deflection measuring system, which is arranged in a detection room and comprises a control cabinet, a support, a monorail crane, a first box staff, a second box staff and a foot stool, the control cabinet, the support, the first box staff and the foot stool are arranged on the ground of the detection room, a lifting platform is mounted on the support, and the monorail crane is mounted on the lifting platform. The lifting platform is provided with a driving device, the driving device is provided with a connecting seat used for installing a to-be-detected blade, the second box staff is used for being installed on a wingtip of the to-be-detected blade, the monorail crane is installed on a roof of the detection room, the monorail crane is provided with a lifting appliance, and the foot stool is arranged on the ground of the detection room. A gradienter is installed on the foot stool, and the control cabinet is in communication connection with the lifting platform, the driving device and the single-rail travelling crane. The device is simple in structure, and the reliability is improved.

The invention relates to the technical field of powder metallurgy, and discloses a powder metallurgy thrust disc forming machining device which comprises a pressure forming mechanism, a powder conveying mechanism is arranged on one side of the pressure forming mechanism, the powder conveying mechanism comprises a supporting frame, and a fixing base is arranged on the upper side of the supporting frame; the fixing base is arranged on the supporting frame and connected with the supporting frame in a sliding mode, an air cylinder used for pushing the fixing base to move is arranged on the supporting frame, and a connecting base is arranged on the fixing base. According to the technical scheme, the screening base provided with the supporting base and the transmission shaft and the supporting frame which is matched with the screening base and provided with the rack are arranged, in the raw material conveying process, along with movement of the screening base, cleaning of the screening net can be conveniently completed through the transmission shaft provided with the scraping plate, and the screening net can be conveniently cleaned through the supporting base provided with the first cavity and the chip removal opening. And by means of the partition plates used in cooperation with the screening base, impurities in the screening base can be conveniently removed, and the screening base is more convenient to clean.

The present invention provides a high-temperature semiconductor refrigeration device and packaging method, including crystal grains, copper-clad ceramic substrates, crystal grain metallized nickel layers, electrodes, and nickel foam layers on the nickel metal layers on the upper and lower surfaces of the crystal grains, and nano-silver solder connection layers, and device packaging is achieved through preheating, hot pressing and other processes. Aiming at the problems of low silver-nickel diffusion efficiency and low connection strength, the present invention constructs a nickel foam alloy layer, uses a nano-metal porous network, and quickly forms a silver-nickel composite structure with nano-silver under hot pressing, and combines online process digital monitoring to enhance the silver-nickel interface connection strength, thereby improving the thermoelectric transport performance and service reliability of semiconductor refrigeration devices.

This utility model relates to a partitioned mycelial bridge root box, comprising a main body and a microporous partition inside the main body. The microporous partition divides the main body into a donor chamber, an intermediate mycelial bridge chamber, and a recipient chamber. The microporous partition has pores and is vertically installed inside the main body, isolating the donor chamber from the intermediate mycelial bridge chamber and from the recipient chamber. Rhizosphere dialysis probe channels are provided on the side walls of the donor chamber, the intermediate mycelial bridge chamber, and the recipient chamber. A top cover is provided on the top of the main body, with a gas exchange inlet and a gas exchange outlet. The lower end of the gas exchange inlet is connected to a diffuser. This novel design uses a vertically installed microporous partition to separate the three chambers. The pore size allows mycelia to pass through while blocking roots, ensuring isolation and connectivity. The inlet connects to the diffuser for uniform gas supply, a valve controls the on / off state, and the outlet exhausts air through a guide pipe. A detachable connector facilitates connection to external equipment.

The utility model provides an improved outer cutter of a reciprocating shaver, which comprises a main body, the main body is formed by bending a thin plate and comprises a top surface with a plurality of cutting teeth and four supporting legs which are respectively bent downwards from four corners of the top surface, the cross section of the top surface is T-shaped, and the cross section of the top surface is T-shaped. The guide beam is formed in the center position in the length direction of the main body in a concave mode or folded in half, the cutting tooth distribution areas are arranged on the front side and the rear side of the guide beam respectively, the cutting teeth are distributed on the cutting tooth distribution areas in the length direction of the front side edge and the rear side edge, and tooth tips of the cutting teeth are free ends and are open teeth relative to the front side face and the rear side face where the four supporting feet are located. The four-corner supporting structure is integrally combined, the top face serving as a working face can be provided with a cutting tooth distribution area, the cutting teeth are open relative to the front side face and the rear side face of the main body, supporting feet on the left side and the right side of the front side face or the rear side face are relatively independent and not connected, and even a buckling structure for fixed connection can be formed, so that materials are saved.