256results about How to "Slow down" patented technology

The invention belongs to the technical field of redundant robots, and particularly relates to an inverse kinematics minimum norm solving method for a mechanical arm with redundant degrees of freedom, which comprises the following steps of: establishing a D-H coordinate system and D-H parameters according to parameters of the mechanical arm, establishing a forward kinematics model according to the D-H coordinates and the D-H parameters of the mechanical arm, and calculating the inverse kinematics minimum norm of the mechanical arm with the redundant degrees of freedom; randomly selecting a group of joint angle values as initial attitude input, converting the group of joint angles into an end effector pose matrix through forward kinematics, establishing an inverse kinematics solution model of the mechanical arm based on Jacobian pseudo-inverse, and optimizing the inverse kinematics solution model by adopting a damping least square method and a gradient projection method, so as to obtain an optimal position of the mechanical arm. And carrying out iterative calculation on the optimized model to obtain a minimum norm solution. According to the method, the singular configuration of the mechanical arm configuration in the movement process is avoided through the damping least square method, the introduced gradient projection method is matched to avoid the limiting position of the joint corner of the mechanical arm, and the obtained minimum norm solution has high resolving efficiency and accuracy.

The invention discloses a hydraulic oil cylinder with high buffering performance, and relates to the technical field of hydraulic oil cylinders, the hydraulic oil cylinder comprises a reciprocating motion assembly, and the reciprocating motion assembly is used for driving a piston rod to do reciprocating rectilinear motion. During use, when a sealing piston is about to move to a stroke terminal, a buffer ring generates thrust on an annular plate, so that two nitrile rubber pads are sunken, meanwhile, a reset spring is extruded and contracted, and under the cooperation of the reset spring and the nitrile rubber pads, the sealing piston is preliminarily buffered, and in addition, a connecting rod pushes a buffer plate to move in an arc-shaped cover; the piston rod body is filled with hydraulic oil and gradually extrudes polyurethane foam, the polyurethane foam has good buffering performance, the filled hydraulic oil generates viscous resistance, the extruded hydraulic oil can enter the buffering cavity through the oil inlet cavity, secondary buffering is conducted on the sealing piston under the cooperation of the polyurethane foam and the filled hydraulic oil, the movement speed of the piston rod body is gradually reduced, and the sealing effect is improved. And stable speed reduction and stopping are realized.

The invention provides a vehicle small table board and a vehicle armrest box, and belongs to the technical field of vehicle parts, the vehicle small table board comprises an extension driving mechanism, the extension driving mechanism comprises an elastic energy storage part, a driving shaft and a driving gear, and the driving shaft is connected with the elastic energy storage part; the lead screw is provided with a transmission gear, the transmission gear is fixedly connected with the lead screw in the circumferential direction, and the transmission gear is meshed with the driving gear so that the driving shaft can drive the lead screw to rotate when rotating. The telescopic connecting piece is provided with a threaded sleeve, the threaded sleeve is in threaded connection with the lead screw, and the lead screw drives the telescopic connecting piece to move in the axial direction of the lead screw when rotating; the table plate body is mounted on the telescopic connecting piece; the non-motor-driven small table plate for the vehicle has the beneficial effects that the requirement for arranging a motor and corresponding electronic elements is omitted, the structure is simplified, the cost is reduced, the risk of electrical faults does not exist, and the use reliability is greatly improved.

The invention relates to the field of injection molding, and discloses an injection molding machine transmission gear box which comprises a gear box and a heat dissipation component, parts in the gear box are soaked in lubricating oil, lubricating grease does not need to be regularly and independently injected into a gear bearing in the gear box, the heat dissipation component comprises an outer shell, a heat dissipation assembly is arranged in the outer shell, and the heat dissipation assembly comprises a heat dissipation tank. An annular magnet is embedded in the outer circular face of the heat dissipation tank, a plurality of heat dissipation fins are arranged on the outer surface of the heat dissipation tank, lubricating oil can be centrifugally thrown out to the tank wall of the heat dissipation tank through the heat dissipation assembly, the lubricating oil flows downwards in a thin oil film state, and therefore the heat dissipation effect on the lubricating oil is improved, scrap iron in the lubricating oil can be made to be closer to the tank wall, and the service life of the lubricating oil is prolonged. The iron scrap is more easily captured by the annular magnet, the iron scrap removing effect is better, the cover plate of the gear box can be opened, and therefore parts in the gear box can be more conveniently disassembled and assembled.

The invention discloses a ball mill with a dustproof structure for producing amino acid from poultry feathers, and relates to the technical field of ball mills. The device comprises a shell, the outer side face of the shell is rotationally connected with the inner side face of a groove plate, end covers are connected to the two ends of the shell through bolts, a transmission assembly is fixedly connected with the top of a bottom plate, the outer side face of a discharging pipe is fixedly connected with the inner side face of the shell, and the side, away from the shell, of the discharging pipe is bent towards the side, close to the bottom plate, of the discharging pipe; the end, away from the shell, of the discharging pipe is in a flat opening shape, the outer side face of the discharging pipe is fixedly connected with a fixing frame, the side, away from the discharging pipe, of the fixing frame is fixedly connected with the top of the bottom plate, the discharging pipe is in the flat opening shape bent downwards, ground feathers can be sprayed out downwards, flying dust is not prone to being generated, gaps of the flat opening shape are small, and the area is not changed. And the material spraying flow speed can be increased, the material spraying volume cannot be affected, smooth discharging can be conducted, and blockage is avoided.

The invention discloses a technological method for refining oxygen-free copper plate crystal grains. The technological method comprises the following steps that an electrolytic copper plate is placed in a furnace bin to be melted, the surface of the electrolytic copper plate is covered with charcoal, semi-continuous casting billet drawing is carried out, and an oxygen-free copper cast ingot is produced; the oxygen-free copper casting blank is put into a heat preservation furnace to be preheated, the preheating temperature ranges from 800 DEG C to 900 DEG C, and the heat preservation time ranges from 2 hours to 3 hours; the preheated cast ingot is subjected to upsetting and drawing, the upsetting deformation is 50%-60%, the cast ingot is drawn to 150%-160% of the original cast ingot, and the upsetting and drawing times are 3-4 times; warm forging and square drawing are started, the warm forging temperature ranges from 700 DEG C to 750 DEG C, the cast ingot is upset to 50%-60% of the original length, square drawing is conducted to the needed blank length, and the final forging temperature is kept to be larger than or equal to 700 DEG C; the blank is cooled to the room temperature, cold forging is started, multiple passes of cold forging are conducted, the rolling reduction of each pass is 10%-15%, and the final cold forging deformation is 30%-60%; and the oxygen-free copper blank obtained after cold forging is subjected to aging heat treatment, the aging heat treatment temperature ranges from 350 DEG C to 450 DEG C, the aging heat treatment time ranges from 1 h to 2 h, air cooling is conducted after annealing, and the oxygen-free copper plate is obtained.

The invention discloses steel for a bearing outer ring of a super-power wind generating set and a manufacturing process of the steel, and belongs to the technical field of wind power equipment manufacturing. The invention discloses steel for a bearing outer ring of a super-power wind generating set. The steel comprises the following components in percentage by mass: 0.48%-0.52% of C, 0.28%-0.33% of Si, 0.62%-0.66% of Mn, 0.97%-1.04% of Cr, 0.16%-0.21% of Mo, 0.005%-0.01% of Ti, 0.003%-0.008% of Zr, 0.0007%-0.001% of Ba and the balance of Fe. According to the method, alloy elements such as Ti, Zr and Ba are used for refining the sizes of grains and inclusions, meanwhile, the crushing degree and uniform distribution of the blank tissue and the inclusions are enhanced through extrusion and torsion, a fine and uniform metal flow line can be obtained after ring rolling, and the mechanical property of a forged piece is improved.

The invention provides an anti-falling protection device and method of a three-coordinate measuring machine and the three-coordinate measuring machine, and aims to realize seamless buffering and tight holding of a Z axis under the condition of accidental gas cut-off, prevent the Z axis from falling and improve the safety and reliability of the three-coordinate measuring machine. The limiting device is used for limiting movement of a z-axis balance guide rail of the three-coordinate measuring machine. The Z-axis damping cylinder is used for buffering a z-axis air floating guide rail of a three-axis moving mechanism in the three-coordinate measuring machine; the detection control unit comprises a first air pressure detection sensor used for detecting the air supply pressure of the z-axis balance guide rail; the second air pressure detection sensor is used for detecting the air supply pressure of the three-axis moving mechanism; the detection control unit controls the operation unit to start the z-axis damping air cylinder to buffer the z-axis air floating guide rail and start the Z-axis band-type brake air cylinder to limit movement of the z-axis balance guide rail according to detected air pressure data.

The utility model provides a drive assembly of an electric drive axle, the electric drive axle and a vehicle, the drive assembly of the electric drive axle comprises two drive mechanisms arranged on an axle housing assembly of the electric drive axle, each drive mechanism comprises a drive motor, an input shaft, an output shaft and an intermediate shaft, and the input shaft and the output shaft are coaxially arranged; the driving motor is connected with the input shaft, the input shaft is connected with the intermediate shaft through a first transmission pair, multiple transmission assemblies are arranged between the intermediate shaft and the output shaft, and the output shaft is connected with the differential mechanism through a second transmission pair. The output shaft is provided with a joint assembly which can be selectively jointed with the first transmission pair or the transmission assembly, and under the joint of the joint assembly, the input shaft and the output shaft are connected to form a direct power transmission path, or the input shaft is connected with the output shaft through the intermediate shaft to form an indirect power transmission path. The drive assembly of the electric drive axle can meet the requirements of various gears, the use performance of the electric drive axle can be improved, and the large-torque power requirement can be met.

The invention provides a grinding pad cleaning method, a grinding pad cleaning device and polishing equipment, and belongs to the technical field of semiconductor manufacturing. The polishing pad cleaning device comprises an image acquisition unit used for acquiring a surface image of a polishing pad; the cleaning unit comprises a brush and a brush moving assembly, a cleaning high-pressure nozzle used for spraying cleaning liquid is arranged in the brush, and the brush moving assembly is used for moving the brush on one side of the surface of the grinding pad; and the control unit is connected with the image acquisition unit and the cleaning unit, and the control unit is used for acquiring the distribution state of a glazed area on the surface of the grinding pad based on the surface image of the grinding pad so as to control the moving state of the brush according to the distribution state of the glazed area on the surface of the grinding pad. The polishing pad can effectively remove a glazed layer on the polishing pad.

The invention provides a silicon-oxygen-carbon composite material as well as a preparation method and application thereof, the surface layer of a silicon-oxygen material of a bulk phase of the composite material is lithiated and reduced into silicon, meanwhile, a double-layer carbon structure ensures the conductivity of the material, a plasma carbon coating layer is formed on the surface of SiO by utilizing a PECVD (Plasma Enhanced Chemical Vapor Deposition) technology before pre-lithiation, and the conductivity of the material is improved. After pre-lithiation, a heteroatom porous carbon coating layer is constructed on the surface of the material, so that a surface conductive layer is kept in contact with the inside, and doping modification is realized while carbon coating is performed. According to the preparation method, the microstructure of the pre-lithiated SiO is optimized, the growth of silicon particles in the pre-lithiation process is reduced, a three-dimensional penetrating conductive network is formed by combining the external carbon layer and the internal carbon layer, a channel is provided for rapid transmission of lithium ions, the conductivity of the material is improved, and volume expansion is relieved. The preparation process is simple, the first efficiency of the material is high, the conductivity is good, and the cycle rate capability is good.

The utility model relates to a shrub stumping machine with a self-adaptive profiling function, which comprises a power head, a support frame and a hydraulic mechanism A. The front end of the support frame is provided with stumping shears, and the bottom end of the support frame is rotatably connected with a conformal land wheel; the hydraulic mechanism A comprises a hydraulic oil cylinder, a balance valve and a piston rod, the hydraulic oil cylinder is obliquely arranged, one end of the hydraulic oil cylinder is fixedly connected with the power head, the interior of the hydraulic oil cylinder is divided into an upper cavity and a lower cavity through a piston in the hydraulic oil cylinder in the gravity direction, and the cavity located above the piston is an upper oil cavity. The balance valve is connected between the two cavities of the hydraulic oil cylinder and slows down hydraulic oil flowing from the lower oil cavity to the upper oil cavity, the shape follow-up land wheel follows the terrain, the balance valve buffers lifting of the supporting frame, and the technical problem that in the traditional profiling process, automation and stability are low is solved.

The invention discloses a discharging control device and method for a rock wool production line, and relates to the technical field of rock wool production lines, the discharging control device comprises a supporting frame, the inner wall of the supporting frame is rotatably mounted on a transmission roller, a conveying belt is arranged on the circumferential surface of the transmission roller, and a driving motor fixedly penetrates through the surface of the supporting frame; the output end of the driving motor is fixedly connected with the transmission roller, and a discharging mechanism is arranged on the surface of the supporting frame. Wherein the compaction device comprises a carrying frame, a placing plate, a compression roller, a servo motor, a sliding plate, a first spring, a holding rod, a door-shaped rod, a pushing plate, a second spring and an abutting plate, the carrying frame is fixedly installed at the top of the supporting frame, the placing plate is slidably installed on the inner wall of the carrying frame, rock wool fibers are effectively extruded through reciprocating movement of the pushing plate, and the rock wool fibers are compacted. Loose rock wool fibers are prevented from being dispersed towards the two sides of the conveying belt in the compaction process, and the stability of the compaction effect is ensured.

The invention relates to the technical field of valve control, in particular to a method and device for controlling a valve through an automatic hydraulic system. The hydraulic cylinder is mounted on one side of the valve and used for controlling the valve; the valve plate is installed at the output end of the hydraulic cylinder and used for making contact with and controlling opening and closing of the valve. The PLC control system is installed on the valve and used for automatically controlling the hydraulic cylinder through a sensor. The valve has the beneficial effects that the closing performance is good, leakage is not prone to occurring, the automation degree is high, the control precision of the valve is improved, the control function is complete, the opening degree of the valve can be accurately controlled, the operation impact is small, the valve plate is slowly opened and stopped, the rest is high in speed, equipment impact is reduced, the service life of equipment is prolonged, and waste is small; leakage pollution and waste are reduced through automatic detection.

The invention relates to the technical field of ocean engineering deep-sea mining equipment, in particular to a multi-metal nodule desliming device suitable for deep-sea mining, which consists of a mineral aggregate input connecting flange, a mineral aggregate input transition cabin, a mineral aggregate enrichment cabin, a waste discharge cabin, a desliming screen, a screen fixing frame, a screen fixing screw and a waste discharge guide plate. The mineral aggregate input connecting flange is located at the front end of the multi-metal nodule desliming device and used for being connected with the multi-metal nodule collecting and conveying device, the mineral aggregate input transition cabin is tightly connected with the mineral aggregate input connecting flange, and a square opening is formed in the rear end of the mineral aggregate input transition cabin. The shape of the front end of the mineral aggregate input transition cabin is the same as that of the mineral aggregate input connecting flange.

The invention relates to the technical field of insulator iron cap production, in particular to an insulator iron cap and a preparation method thereof.The preparation method comprises the steps that after a steel ladle is preheated, a part of spheroidizing agent and a part of nucleating agent are laid at the bottom of the steel ladle, and a TiC-SiC-Fe reinforcing material plate is laid at the top of the spheroidizing agent and the top of the nucleating agent; the remaining spheroidizing agent and nucleating agent are subjected to core wrapping with aluminum, and an aluminum core-spun yarn is obtained; the molten iron liquid is injected into a steel ladle, dross is skimmed after a reaction, then an aluminum core-spun yarn is fed into the steel ladle, the reaction is continued, dross is skimmed again after the reaction is finished, and enhanced molten iron is obtained; pouring enhanced molten iron into the mold, and carrying out solidification, cooling, demolding and fine finishing to obtain an intermediate casting; and carrying out hot-dip galvanizing treatment on the intermediate casting, and plating a corrosion-resistant zinc layer to obtain the insulator iron cap. The TiC-SiC-Fe reinforced material plate is used for refining grains, the nodulizing agent and the nucleating agent are added in batches, and the corrosion-resistant zinc layer is plated, so that the prepared insulator iron cap has excellent mechanical strength and corrosion resistance.

The invention provides a red mud treatment method. The treatment method effectively solves the problems that in the prior art, red mud is complex in component, poor in economical efficiency, poor in red mud magnetic concentrate grade and low in iron recovery rate, magnetic tailing resources are not fully utilized, the cost is low, and the like through electromagnetic magnetization pre-reduction roasting treatment, magnetic separation enrichment of iron concentrate powder, smelting reduction iron extraction, smelting tailings building application and magnetic separation tailing enrichment and aluminum extraction. The method solves the problems of difficulty in operation of a melting ironmaking process and poor building material performance of slag in the prior art, so that iron and aluminum in the red mud are fully recycled, and the economic benefit of red mud treatment is remarkably improved.

The utility model relates to the technical field of desulfurization towers, in particular to a blast furnace gas desulfurization tower device which comprises a tower body, and a discharging bin, a gas inlet bin, a pretreatment bin, a gas heating and temperature adjusting bin, a hydrolysis bin, a cooling bin, a desulfurization bin, a gas outlet bin and a medicament adding bin are sequentially arranged in the tower body from bottom to top. A heat exchanger used for heating is arranged in the coal gas heating and temperature adjusting bin, an organic sulfur hydrolytic agent is arranged in the hydrolysis bin, a heat exchanger used for cooling is arranged in the cooling bin, a desulfurizing agent is arranged in the desulfurizing bin, a plurality of chemical adding bins used for conveying chemicals are arranged at the top end of the tower body, and the bottom ends of the chemical adding bins are all communicated with a feeding pipe. The pretreatment bin, the hydrolysis bin and the desulfurization bin are all communicated with a blanking pipe. Therefore, the device disclosed by the utility model can simultaneously realize the functions of pretreatment, hydrolysis, hydrogen sulfide absorption and the like, meets the lower emission requirements of most users, and is simple, convenient to operate and small in occupied area.

The utility model belongs to the field of circulating fluidized bed boilers, and particularly relates to a boiler longitude and latitude anti-abrasion device which is assembled on a boiler body, a hearth is arranged in the boiler body, a plurality of drainage blocks are continuously and fixedly assembled on the inner wall of the hearth, and each drainage block is provided with an inclined downward face and an inclined upward face. According to the warp and weft anti-abrasion device of the boiler, through cooperation of the drainage blocks and the anti-abrasion pieces, the problems that large particles of different height parts of an existing hearth fall down along the side wall of the hearth, internal circulation of materials is formed, and the heat dissipation efficiency is improved are solved. And the materials falling close to the wall form shearing collision on the water cooling wall tube of the boiler, so that the water cooling wall tube is seriously abraded, and a heating surface frequently leaks, so that a unit stops running.

The invention relates to a redundant dynamic braking system. The redundant dynamic braking system may include: a main braking force adjusting device configured to control a hydraulic braking device of a vehicle; a receiving unit configured to receive driving information of the vehicle; an electronically controlled brake device configured to be electrically operated to generate a braking force; and an auxiliary braking force adjusting device configured to control the hydraulic braking device and the electronic control braking device in a case where a failure occurs in the main braking force adjusting device, the auxiliary braking force adjusting device is configured to control the electronically controlled brake device by adjusting a magnitude of a current applied to the electronically controlled brake device and an application time based on a target pressure estimated using the driving information.

This utility model discloses a hot-pressing laminating device for producing paper honeycomb pallets, including a base. A transmission cavity is formed at the upper end of the base, and a threaded rod is rotatably mounted inside the transmission cavity. Two movable seats are threadedly connected to the external side of the threaded rod. A lower mold is mounted on the upper end of each movable seat, and the lower mold slides in engagement with the base. A cooling box is located at the middle of the upper end of the base. Four support rods are welded to both sides of the upper end of the base, and a top cover is mounted on the upper end of each support rod. A hot-pressing cylinder is mounted on the upper end of the top cover, and a lifting seat is located at the output end of the hot-pressing cylinder. This hot-pressing laminating device for producing paper honeycomb pallets cools the paper honeycomb pallets through contact between cold air and the pallets, significantly shortening the time required for the pallets to cool to a safe operating temperature. Simultaneously, it achieves the synchronous execution of the hot-pressing laminating and cooling processes, greatly increasing production efficiency.

The utility model discloses a cigarette carton packaging machine's cigarette deceleration device, include: conveying assembly and deceleration subassembly, conveying assembly includes first fixed block, second fixed block, first slide and second slide, and first fixed block and second fixed block are arranged below cigarette carton packaging machine export passage respectively, and are located the both sides of export passage, and first slide and second slide are arranged on the inboard wall of first fixed block and second fixed block respectively, deceleration subassembly includes fixed plate and brush, and fixed plate is located the outside of first fixed block and second fixed block respectively, and brush sets up on the inboard wall of fixed plate, and brush is butt joint with the outer wall of cigarette. When using, cigarette moves in first slide and second slide, when cigarette moves to the top of fixed plate, and brush contacts with the outer wall of cigarette, and the friction effect of both effectively reduces the movement speed of cigarette, reduces the risk that cigarette appears and collides and deforms, and the bristle of brush also carries out cleaning to cigarette surface, improves product quality.

The invention relates to the technical field of unmanned aerial vehicles, and particularly discloses an unmanned aerial vehicle vertical forced landing protection device which comprises an unmanned aerial vehicle, and power cavities are formed in the four corners of the bottom of the unmanned aerial vehicle; the number of the lifting rods is four, the four lifting rods are arranged at the four corners of the bottom end of the unmanned aerial vehicle correspondingly, and the positions of the four lifting rods correspond to the positions of the four power cavities correspondingly. The power mechanism is arranged in an inner cavity of the power cavity; the protection mechanism is arranged at the bottom end of the unmanned aerial vehicle. The device can quickly respond when the power of the paddles fails, effectively maintain the balance of the unmanned aerial vehicle, avoid deflection in the forced landing process and remarkably improve the forced landing success rate, in addition, a protection mechanism is integrated, the descending speed can be slowed down, additional supporting protection can be provided after landing, impact caused by uneven ground is effectively resisted, and the safety of the unmanned aerial vehicle is improved. The integrity of the unmanned aerial vehicle structure is ensured, the economic loss is reduced, and the subsequent task execution capability and the data collection continuity are ensured.

The present invention discloses a method for fast batch automatic downloading of high-throughput sequencing data, the method is based on snakemake language and MySQL database, and specifically includes the following steps: process triggering; capturing sample information in the process; uploading sample information to MySQL database; automatically downloading samples marked as wait in the database; modifying the sample status after the download starts in the database; synchronizing sample information to the MySQL database after the download is completed; modifying the database status of the downloaded sample; sending a summary email of the download; deleting sample data of completed projects. The method of the present invention can synchronize and download sample information in batches, and the whole process does not require human intervention, and can automatically trigger various links in the middle. During the processing process, the download summary information of the sample data will be automatically sent to the monitor in a timely manner to ensure that all operation steps can be traced, and the MySQL database is used to facilitate various information queries. The present invention also discloses a system and application for implementing the above method.

The invention provides a composite brake parachute for an aircraft, and belongs to the technical field of aircraft landing deceleration, the composite brake parachute specifically comprises a first parachute body, a plurality of second parachute bodies, a first connecting rope and a plurality of second connecting ropes, the first parachute body is connected with the tail of the aircraft through the first connecting rope, and the second parachute bodies are mutually connected through the second connecting ropes; the umbrella cloth of the first umbrella body is connected with the umbrella rope of the second umbrella body through a second connecting rope. According to the treatment scheme, the requirement for the structural strength of a single brake parachute material is lowered while the speed reduction effect and reliability of the brake parachute are improved.

The invention discloses urban excrement solid-liquid separation treatment equipment, and relates to the technical field of urban excrement treatment.The urban excrement solid-liquid separation treatment equipment comprises an upper shell and a centrifugal assembly, a support is arranged in the center of the top of the upper shell, a lower shell is connected to the interior of the lower end of the upper shell, a sewage inlet pipe is arranged at the top of the upper shell, and a liquid drainage pipe is connected to one side of the upper shell; a waste frame is slidably connected into the lower end of the lower shell. After excrement is conveyed into the filter cartridge, part of sewage flows out through filter holes in the filter cartridge, and after a certain amount of sewage is accumulated, a motor drives a duplicate gear to rotate, so that when the feeding assembly moves the filter cartridge to the synchronous assembly, a double-gear shaft is meshed with a synchronous gear, and the sewage is discharged out of the filter cartridge. At the moment, the duplicate gear can drive the filter cartridge to rotate through the acceleration gear, the transmission shaft, the synchronous shaft, the synchronous gear, the double-gear shaft and the gear ring, and sewage in the feces can be rapidly thrown out through centrifugal force.

The invention discloses a welding and positioning tool for a power distribution cabinet shell, and relates to the technical field of power distribution cabinet machining equipment. The power distribution cabinet shell welding positioning tool comprises a clamping frame, the clamping frame comprises a fixed clamp, a movable clamp is slidably connected into the fixed clamp, an electromagnetic clamp is fixedly connected to one side of the fixed clamp, and the electromagnetic clamp comprises an electromagnetic clamp body, a clamp pressing plate, a follow-up disc and a driver. The top of the fixed clamp is slidably connected with a loosening feedback support, and the other side of the loosening feedback support is slidably connected with one side of the movable clamp. According to the welding and positioning tool for the power distribution cabinet shell, through the arrangement of the movable clamp fixed in a tooth surface meshing mode, the electromagnetic clamp fixed to the bottom fixing clamp and the looseness feedback support, the stability of the clamp for clamping a plate for a long time is improved, and accurate control over shaking and downward moving of the movable clamp is achieved; and the probability that the movable clamp shakes is reduced.

The present application relates to the field of heart rate monitoring, and particularly relates to a method and device for monitoring heart rate during exercise based on a smart watch. The method comprises the following steps: obtaining geographical position information of a user based on a smart watch, identifying a user exercise scene, and generating an exercise scene type; collecting original heart rate detection parameters, performing time series heart rate feature analysis, and constructing a heart rate feature set; performing deep exercise mode recognition on the exercise scene type and the heart rate feature set, and obtaining a user exercise mode; performing global heart rate situation awareness on the heart rate feature set, and constructing a global heart rate situation map; and performing comprehensive risk assessment and self-adaptive early warning decision-making on the global heart rate situation map according to the user exercise mode. The present application realizes self-adaptive analysis of a user heart rate state, and improves user exercise safety assessment efficiency and accuracy.

The present invention aims to provide a hammer for a pulverizer capable of improving pulverizing efficiency and extending service life. The structure is as follows: A hammer for a pulverizer comprises a sheet-shaped hammer matrix, one end of the hammer matrix is ​​provided with a pin hole (1), two right angles of the other working end of the hammer matrix, namely the side end face (2) and the front end face (3), are both welded with wear-resistant material, the wear-resistant material is tungsten carbide alloy, and the characteristic is that the two right angles of the other working end of the hammer matrix are symmetrically removed to form an oblique push end face (4), and the front end face (3) and the side end face (2) connected thereto are welded with wear-resistant material to form a fan-shaped end face (5), and the upper and lower planes (8) of the hammer adjacent thereto are welded on three sides to form a spherical head (6), so that the side cross-sectional view of the hammer is in the shape of a matchstick with a spherical head (6).