66results about How to "Safeguard the environment" patented technology

The invention belongs to the technical field of traffic safety and intelligent traffic systems and discloses a traffic field warning device. The device comprises a field warning device body. The field warning device body is internally provided with a communication module, a power supply module, a positioning module and a control module. The power supply module, the communication module and the positioning module are electrically connected with the control module. The communication module is used for sending the positioning information of a traffic accident / a construction site / a stalled vehicle and the warning information, generated by the positioning information, to an externally arranged intelligent traffic management system. According to the technical scheme of the invention, the problems in the prior art that existing traffic field warning devices are single in function and cannot effectively warn running vehicles in a rear area in advance are solved effectively. The above device realizes the visual warning function at a traffic site, and then actively sends out the positioning information and the warning information of the traffic site. Therefore, the condition that traditional on-site warning devices only have the visual warning function can be changed. The invention also discloses a warning information system and a field warning information publishing method corresponding to the system.

The invention discloses a bytecode check-based Java intelligent contract safety detection method. The method comprises the following steps of: firstly compiling an intelligent contract safety detection rule by a user, and sending a bytecode file generated by a compiled Java intelligent contract and a customized intelligent contract safety detection rule to an intelligent contract execution engine; after a file is received by the intelligent contract execution engine, dynamically loading a system rule and a user-defined rule by the intelligent contract execution engine; and operating a safety detection program, if the detection fails, returning a result, and if the detection succeeds, entering the execution process and returning an execution result. According to the method, the problem that traditional intelligent contract safety detection is insufficient is solved, the safety of virtual machines and data is ensured, the condition of improperly compiling codes of intelligent contracts can be avoided and the intelligent contract operation performance is improved.

The invention discloses a vacuum juicer, and belongs to the field of juicers. The vacuum juicer comprises a vacuum cover assembly, a stirring cup assembly and a main unit, wherein the vacuum cover assembly comprises a vacuum cover and a cam rotating around the vacuum cover, and a sealant is arranged on the cam; the stirring cup assembly comprises a stirring cup holder and a stirring cup, and a movable valve is arranged on the stirring cup and slides up and down to control opening and closing of a stirring cup air hole; a vacuum pump in the main unit is in sealed connection with the internal space of the vacuum cover. According to the vacuum juicer, the interior of the stirring cup can be vacuumized before and during fruit juice stirring, the stirring cup can be taken out to be carried and stored in the vacuum state for a period of time, and the phenomenon that fruit juice makes contact with air and consequentially is oxidized is avoided during this period of time.

The invention relates to a full coupled test probe for dry hole sound wave, and belongs to the field of nondestructive examination equipment manufacture of engineering. The full coupled test probe for the dry hole sound wave comprises a sound wave probe and a pressurizing water bag, wherein the top at one sealed end of the pressurizing water bag is provided with a vent hole of which the diameter is not more than 1 millimeter. An end part of the sound wave probe is provided with a connecting device; and the pressurizing water bag is sleeved outside the sound wave probe. Air in the pressurizing water bag can be directed exhausted by the vent hole; and the pressurizing water bag is filled with water at the same time to ensure internal coupling between the sound wave probe and the pressurizing water bag. The vent hole at the top of the pressurizing water bag has double uses, namely, after the air is exhausted, the vent hole continuously keeps continuous small amount of spilling water, so as to solve coupling (external coupling) between the outer wall of the pressurizing water bag and the wall of the hole. The test probe realizes full coupling of the sound wave prove, the pressurizing water bag and the wall of the hole so that the tested data are stable and reliable, and meets the requirement of rapid detection.

The invention discloses a movable garbage compression device. The movable garbage compression device comprises a compression bin used for compressing garbage entering the equipment inwards and a garbage can connected with the output end of the compression bin and used for receiving the garbage output by the compression bin and storing the garbage, wherein a discharging opening used for dischargingthe garbage and a discharging door covering the discharging opening in a sealing manner are arranged at the end, away from the compression bin, of the garbage can; a feeding opening used for feedingthe garbage is formed in the end, away from the garbage can, of the compression bin; the height of the wall body of the feeding side of the feeding opening is matched with the discharging height of abutt joint discharging vehicle so that a discharging box of the butt joint discharging vehicle can be overturned into the feeding opening to conduct direct butt joint discharging; a can overturning mechanism used for hooking the garbage can and overturning the garbage can to the position of the feeding opening to dump the garbage is further arranged outside the wall body of the feeding side of thefeeding opening; the can overturning mechanism is further used for serving as anti-collision limiting of the butt joint discharging vehicle; and a pressing filling mechanism used for pushing and pressing the garbage entering the compression bin from the upper portion is arranged at the upper portion of an inner cavity of the compression bin.

The invention provides an automatic controlling device for an air conditioner of a base station. The device comprises a main fan, an external fan, a compressor and an electrical heating pipe of a refrigerating system of the air conditioner, and a temperature sensor, wherein an output end of the temperature sensor is connected with an input end of a programmable logic controller (PLC); an output end of the PLC is respectively connected with input ends of an electric air valve and a contactor; and a contact of the contactor is respectively connected with the compressor, the external fan and the electrical heating pipe. The device can start the related equipment for refrigerating, ventilating or heating through the PLC according to comparison between a real-time detected temperature and a set temperature and an outdoor temperature, so that the energy consumption is saved, and the service life of the air conditioner is prolonged. The running condition of the air conditioner in the base station can be mastered in real time by a monitor, and a control command can be sent out in real time, so that the remote monitoring on the air conditioner of the base station can be realized, and the air conditioner can automatically deal with various working conditions and run normally in an unmanned operation environment.

The invention discloses an infectivity scrapie resistance gene rapid typing detection reagent, and a preparation method and application thereof, which is characterized in that three sets of idiosyncratic primers and Taqman probes are designed and synthesized; and 136-position, 154-position, 171-position codons of sheep prion protein encoding gene PRNP which respectively determine scrapie resistance / sensibility are detected for judging whether sheep to be detected contain infectivity scrapie resistance gene. The invention establishes a rapid, simple and convenient gene typing method with strongspecificity and high sensitivity with the help of a real-time fluorescence quantitative PCR detection system and a subsequent end-point reading plate model; the detection time is only a plurality ofhours; and with the help of the method, a whole set of thorough early warning and monitoring system is established for preventing scrapie, can be applied to a conventional laboratory diagnosis method,is used as a test item for introducing live sheep by entry-exit inspection and quarantine departments so as to put an end to the introduction of the scrapie sensitivity varies.

A feeding device for an automatic open bag filling machine belongs to the technical field of packaging machinery, and comprises a frame, a hanging bracket, a dual-stroke acting cylinder, a clamping acting cylinder link mechanism and a pair of bag mouth clamping acting cylinders. The feeding device is characterized by comprising a feeding device assembly. The feeding device assembly comprises a cantilever crane, a lower connecting frame, a lower hopper supporting bottom plate, a lower hopper, a feeding guide pipe, a left bag opening door, a right bag opening door, a bag opening door opening and closing mechanism and a cantilever crane actuating acting cylinder. Cantilever crane supporting shaft head fixing plates are respectively fixed at the left ends on the front side and the right side of the cantilever crane. A front lower connecting frame fixing plate connecting seat and a right lower connecting frame fixing plate connecting seat are arranged at the inclined right ends of the front side and the rear side of the cantilever crane. A front lower connecting frame fixing plate is arranged in the middle on the front side of the lower connecting frame. A front lower connecting frame fixing plate pin shaft is arranged at the lower end of the front lower connecting frame fixing plate. A rear lower connecting frame fixing plate is arranged in the middle on the right side of the lower connecting frame. A rear lower connecting frame fixing plate pin shaft is arranged at the lower end of the rear lower connecting frame fixing plate. A feeding guide pipe mounting pipe is arranged in the middle of the lower hopper supporting bottom plate. Materials in the feeding hopper are enabled to fall into a bag for filling by the feeding guide pipe, and the mounting and the using are facilitated.

The invention discloses a clean and pollution-free blackboard device capable of automatically erasing characters and removing dust for students. The clean and pollution-free blackboard device comprises a classroom body, wherein a blackboard is fixedly installed on the wall on the front side of the classroom body, a moving mechanism is arranged in the classroom body, a blackboard erasing mechanismis arranged in the classroom body, the blackboard erasing mechanism is provided with a first electric telescopic rod, a second electric telescopic rod, a holding table, a servo motor, a second coupling, a supporting table, a through hole, a fixing bearing, a rotating shaft, a rotating brush, an inclined protecting plate, a rubber pad, a vacuum sucker and an infrared distance measuring instrument,wherein a dust collecting mechanism is arranged in the classroom body, the dust collecting mechanism is provided with a suction pump, air suction holes, a telescopic multi-way pipe, a first installation support, a dust collection box, a telescopic hose and a second installation support, a positioning mechanism is arranged on the blackboard, and a controller is arranged on a wall in the classroom body. The clean and pollution-free blackboard device has the advantages of being simple in structure and high in practicability.

The invention relates to a lifting jack oiling machine, which belongs to the tooling apparatus technical field. The lifting jack oiling machine comprises a base which has a base chamber at the bottom, an electrical control case which is arranged at the top of the base and positioned at one side of the top, a column possessing a column chamber which is fixed at the top of the base, a reversing valve elevating system which is connected on the column, a reversing valve which is connected to the reversing valve elevating system, a vacuum-pumping mechanism which is arranged in the base chamber and is connected to the reversing valve elevating system and a reversing valve air path, an oil filling mechanism which is arranged in the base chamber and is connected to a reversing valve oil path; and the electrical control case is connected to the reversing valve, the vacuum-pumping mechanism and the oil filling mechanism in an electrical control mode. The lifting jack oiling machine has the advantages that the work efficiency is enhanced, the labor intensity of workers can be mitigated, the labor force resource can be saved, no bubbling and drop-leaking phenomena can not generated during the work process, and the work on-site environment can be guaranteed.

The invention provides a DoS (Denial of Service) attack defense method based on an identity and location separation-and-mapping mechanism. The DoS attack defense method comprises the following steps: on the basis of a mapping system of an identity and location separation network architecture, an additional communication status flag is added to mapping information in an xTR mapping cache; a proxy server integrates the communication status flag with the mapping system of the identity and location separation network architecture, and the communication status flag of the mapping information in the xTR mapping cache is obtained by inquiring the proxy server, wherein, the proxy server collects and maintains the communication status of a terminal and responds to inquiry of the xTR communication status by inquiring the terminal within the management range of the proxy server; when the terminal finds to be vulnerable to malicious attack, the terminal requires to stop transmission of attack data stream; and when the terminal sets the communication status to be allowable partial connection, a sending end completes the connection establishment process. By adopting the DoS attack defense method, DoS attack defense can be realized, and the terminal can actively require defense in case of malicious attack so as to prevent further hazard without affecting other communication connection of the terminal.

The invention discloses a determination method and system for a road feasible region. Single-frame data scanned by a single-line laser radar are obtained, wherein the single-frame data include a plurality of single-frame data points including laser reflection strength and laser returning distances; whether the laser reflection strength is higher than a preset threshold value is determined to obtain a first determination result; when the first determination result shows that the laser reflection strength is higher than the preset threshold value, the data points are divided as obstacle areas; and otherwise, the data points are divided as road surface areas; and according to laser returning distances, road edge areas are determined. According to the invention, on the basis of a hop characteristic of a road edge and a threshold condition of a laser reflection strength value, information including a road edge and a carrier feasible region is obtained by screening, so that the divided feasible region becomes accurate and stable. Therefore, improvement of the road edge extraction and road feasible region algorithm is realized. A little radar data information is needed; the calculation load is small; and the cost can be reduced.

The invention discloses a subway station public area environmental control system. The subway station public area environmental control system comprises an equipment large-end environmental control machine room, an equipment large-end smoke exhaust fan, an equipment large-end exhaust shaft, an equipment small-end environmental control machine room, an equipment small-end smoke exhaust fan, an equipment small-end fresh air shaft and an equipment small-end exhaust shaft. A subway station public area is connected with the equipment large-end environmental control machine room and the equipment small-end environmental control machine room through public area air supply pipes, and station hall air supply and platform air supply are achieved; an equipment large-end public area air return pipe isconnected with the equipment large-end smoke exhaust fan and the equipment large-end environmental control machine room, and station hall air return and smoke exhaust and platform air return and smoke exhaust are achieved; and an equipment large-end public area air return / exhaust pipe is connected with the equipment small-end smoke exhaust fan and the equipment small-end environmental control machine room, and station hall air return / exhaust and smoke exhaust and platform air return / exhaust and smoke exhaust are achieved. According to the subway station public area environmental control system, outdoor fresh air is treated through a combined air conditioner box in the small-end environmental control machine room and is fed into the public area, the area of a large-end fresh air shaft is reduced, and the influence of a ventilation pavilion on the ground landscape is reduced.

The invention discloses porous calcium phosphate ceramics based on coating of calcium sulfate salt. Calcium phosphate is taken as a substrate, andthe surface of the calcium phosphate is coated with the calcium sulfate salt to form a porous structure with arbitrary shapes; the hole types of holes in at least one dimension of directions are regular in the three-dimensional space directions in the porous structure, and the distances between the centers and edges of the holes are 50 to 2000 micrometers, and all the holes are interpenetrating. In addition, the invention further provides a preparation method of the porous ceramics. According to the designed porous ceramics, the quickly-degraded calcium sulfate salt is on the surface, and the slowly-degraded calcium phosphate are inside, so after the ceramics are implanted into a body, a gradient degradation processcan be formed, so that the porous ceramics are endowed with very high osteogenic activity, and the ceramics can maintain enough mechanical strength in a given period. Therefore, the designed porous ceramics have very high osteogenic activity, and the risk of rapid disintegration after implantation of the ceramics in the early and middle periods is also reduced.

The invention discloses a powder spraying chamber convenient to clean. The powder spraying chamber comprises a working chamber with an exhaust inlet at the bottom and an exhaust pipeline communicated with the exhaust inlet. A second exhaust inlet is arranged on the lateral wall of the working chamber; a communication pipeline is arranged between the second exhaust inlet and the exhaust pipeline; a valve is arranged on the communication pipeline; and one side of the second exhaust inlet, which is arranged inside the working chamber, is connected with a power adsorbing brush through a flexible pipe. According to the invention, the exhaust pipeline is led into the working chamber through the communication pipeline and the powder adsorbing brush is connected by the flexible pipe, so that powder on the inner wall of the powder spraying chamber is cleaned by the powder adsorbing brush. Therefore, dust does not fly in the powder spraying chamber, and the body health and the working environment of workers are ensured.

The invention relates to a ton bag filling device with a bag holding and bulging mechanism. The ton bag filling device comprises a rack, wherein a weighing hopper is arranged on the rack; a filling nozzle is connected to an outlet at the lower part of the weighing hopper; a bag opening clamping mechanism is arranged on the outer wall at the lower part of the filling nozzle; the outlet at the lowerend of the weighing hopper is connected to the filling nozzle through a four-way pipe; an upper port and a lower port in the four-way pipe are respectively connected to a weighing hopper and the filling nozzle; two ports located on the side part in the four-way pipe are respectively connected to a blast air pipe and a dust collection air pipe; the dust collection air pipe is connected to an external dust collection fan; the upper end of the blast air pipe is connected to a bag bulging fan; the bag bulging fan is arranged on the side part of the rack through a support frame; and a ton bag holding mechanism is further arranged. The device is simple and ingenious in structural design and good in practicability, the stability of ton bags in the filling process is greatly improved, and rapid and smooth filling of materials can be well achieved.

The invention discloses a vomit receiving device used in the gastroenterology department. The vomit receiving device comprises a base, wherein a material storage cylinder is placed at the top of the base, a garbage bag sleeves the interior of the material storage cylinder, a circular ring is arranged at the top of the material storage cylinder, a separation frame is fixedly connected to the bottomend of the interior of a supporting cylinder, the top of the separation frame is connected with a baffle through a movable mechanism, an opening is formed in the surface of the baffle, a material guide cylinder is arranged at the top of the baffle, the top of the material guide cylinder is fixedly connected with the inner wall of the supporting cylinder through a conical cylinder, a sampling mechanism is connected to the side wall of the material guide cylinder, a shielding mechanism is connected to the top of the material guide cylinder, a push rod is fixedly connected to one side of the topof the baffle, two pressing mechanisms are arranged on the side, close to the supporting cylinder, of the push rod, and a first movable opening and a second movable opening are formed in the positions, close to the pressing mechanisms, of the side wall of the supporting cylinder. The vomit receiving device has beneficial effects that the device can be used by multiple patients, and the cleaning frequency of medical staff is reduced.

The invention discloses a steel wire pickling device which comprises a pickling tank and two rinsing tanks, wherein the pickling tank is arranged between the two rinsing tanks, a cover plate is arranged on each rinsing tank, a plurality of leakage holes are formed in each cover plate, a water pump is arranged in each rinsing tank, a water inlet end of each water pump is arranged at the bottom part of the corresponding rinsing tank, and a water outlet end of each water pump is arranged on the corresponding cover plate of the rinsing tank. When a steel wire is pickled, a pickling solution does not splash, the amount of water used is greatly reduced during rinsing, the water does not flow around randomly, no ground pollution is caused, and a whole workshop is kept clean and tidy.

The invention discloses an air-regulation cultivation method for green bean sprouts and a device of the method. The method comprises the steps that green beans are heated in hot water of 95 DEG C, soaked in warm water for 90 minutes and subjected to high-temperature sterilization in a cultivation box, after sterilization, the green beans are placed in a sterile cultivation chamber for cultivation,from the starting time to the third day of cultivation, circulation gas in the cultivation period is composed of 19.8% of oxygen, 0.031% of carbon dioxide, 78% of nitrogen and the balance rare gas, from the fourth day to the eighth day, circulation gas in the cultivation period is composed of 18.5% of oxygen, 0.021% of carbon dioxide, 75% of nitrogen and the balance rare gas, and in the ninth day, cultivation is ended. According to the method, the problem is fundamentally solved that hormones, quantitative chemical medicine and the like are used for cultivating poisonous bean sprouts, the bean sprouts produced through the cultivation method are even in thickness and length of appearance, fresh and cool in taste, high in nutrient component content and low in poisonous chemical medicine residue content, timely quantitative control is conducted, the accuracy and stability of gas are guaranteed, the gas resources are also saved, and the environment of bean sprout production can be effectively guaranteed.

A feeding device for an automatic open bag filling machine belongs to the technical field of packaging machinery, and comprises a frame, a hanging bracket, a dual-stroke acting cylinder, a clamping acting cylinder link mechanism and a pair of bag mouth clamping acting cylinders. The feeding device is characterized by comprising a feeding device assembly. The feeding device assembly comprises a cantilever crane, a lower connecting frame, a lower hopper supporting bottom plate, a lower hopper, a feeding guide pipe, a left bag opening door, a right bag opening door, a bag opening door opening and closing mechanism and a cantilever crane actuating acting cylinder. Cantilever crane supporting shaft head fixing plates are respectively fixed at the left ends on the front side and the right side of the cantilever crane. A front lower connecting frame fixing plate connecting seat and a right lower connecting frame fixing plate connecting seat are arranged at the inclined right ends of the front side and the rear side of the cantilever crane. A front lower connecting frame fixing plate is arranged in the middle on the front side of the lower connecting frame. A front lower connecting frame fixing plate pin shaft is arranged at the lower end of the front lower connecting frame fixing plate. A rear lower connecting frame fixing plate is arranged in the middle on the right side of the lower connecting frame. A rear lower connecting frame fixing plate pin shaft is arranged at the lower end of the rear lower connecting frame fixing plate. A feeding guide pipe mounting pipe is arranged in the middle of the lower hopper supporting bottom plate. Materials in the feeding hopper are enabled to fall into a bag for filling by the feeding guide pipe, and the mounting and the using are facilitated.

The invention discloses a web forming device for an air laid machine and belongs to non-woven machinery. The device comprises a first web forming box stand, a second web forming box stand, a set of web forming box stand supporting pipes, a web forming curtain upper guide roller, a web forming curtain lower guide roller, a web forming curtain, a web forming curtain driving device and a web forming curtain induced draft box, wherein the first web forming box stand and the second web forming box stand are oppositely arranged, the set of web forming box stand supporting pipes are fixed between the first web forming box stand and the second web forming box stand, the web forming curtain upper guide roller and the web forming curtain lower guide roller are supported between the first web forming box stand and the second web forming box stand and sleeved with the web forming curtain, the web forming curtain driving device is arranged on the first web forming box stand, the web forming curtain induced draft box is arranged between the first web forming box stand and the second web forming box stand, and an opening of a web forming curtain induced draft box cavity faces upwards and makes contact with the inner side of the web forming curtain. The device is characterized by further comprising an automatic web forming curtain cleaning mechanism, and the automatic web forming curtain cleaning mechanism is arranged between the first web forming box stand and the second web forming box stand corresponding to the position below the front side of the web forming curtain and makes contact with the surface of the side, backing onto a web forming curtain cavity, of the web forming curtain. By the adoption of the device, work strength is reduced, web forming efficiency is guaranteed, and secondary pollution is avoided.

The invention discloses an intelligent greenhouse and an irrigation method of an irrigation system of the intelligent greenhouse. The intelligent greenhouse comprises a greenhouse main body and the intelligent irrigation system, wherein the greenhouse comprises a greenhouse framework, an external sunshade device and an internal sunshade device, the intelligent irrigation system comprises an information acquisition module, a central control module, a water and fertilizer integrated micro-irrigation fertilization module and a feedback module, the intelligent irrigation system is used in cooperation with a greenhouse, and an information collection module is used for collecting soil moisture content and fertility; the central control module comprises a greenhouse controller and a block controlcabinet, a database is arranged in the greenhouse controller and used for processing information, generating illumination time and irrigation and fertilization commands and sending the irrigation andfertilization commands to the block control cabinet, and the block control cabinet is used for converting the commands and then sending the commands to the external sunshade device and a micro-irrigation and fertilization device to work; the feedback module is used for detecting illumination and irrigation and fertilization conditions in real time and automatically switching on and off the external sunshade device and the micro-irrigation and fertilization device; and the intelligent irrigation system provides an ideal growth environment for plants, and has the advantages of improving greenhouse climate and increasing yield.

The invention relates to a Mn-Zn ferrite powder conveying device and a material receiving device used by the same, and belongs to an auxiliary facility in production of Mn-Zn ferrite. The conveying device comprises an automatic powder conveying mechanism which is connected with a discharge port arranged in the bottom wall of a vibration grinding box body in a matched way, a group of sealing cover plate lifting acting cylinders which are fixedly arranged on the box bottom wall and of which acting cylinder columns are arranged downwards, a sealing cover plate which is connected with the group of cylinder columns, and a flexible transition sealing sleeve, wherein a sealing cover plate discharge hole is arranged at the center of the sealing cover plate, and one side, back to the box bottom wall, of the sealing cover plate is fixedly provided with a sealing gasket; and a pressing strip is fixedly arranged at the surrounding edge part of the sealing gasket and is matched with the Mn-Zn ferrite powder receiving device, one end of the flexible transition sealing sleeve is connected with the automatic powder conveying mechanism, and the other end of the flexible transition sealing sleeve is connected with the sealing cover plate corresponding to the discharge hole of the sealing cover plate. The Mn-Zn ferrite powder conveying device has the advantages of ensuring the environment of an operation site, protecting the health of workers, preventing material waste, and facilitating discharging.

The invention discloses a rice making process and rice steaming equipment. The rice making process comprises the following steps of 1, rice boiling: putting rice grains into a rice container; adding a corresponding amount of water; boiling the rice grains to the cooked degree required by later-stage steaming; 2, water discharging: after the boiling is completed, discharging rice boiling water inside the rice steaming equipment; 3, rice steaming: A: after the discharging of the rice boiling water is completed, adding a proper amount of water, then, performing heating for forming steam, and steaming the rice grains boiled in the rice container; B, directly adding steam into rice steaming equipment through a water inlet and air inlet pipe for steaming, and completing the process of making uncooked rice into cooked rice. Compared with the prior art, the rice making process has the advantages that the operation mode of firstly boiling and then steaming is used; the rice made by the method absorbs less water than that in the prior art since the boiled water is separated in the rice cooking process and the steam is used for cooking in a later period, so that the rice made by the rice making process has higher rice grain feeling, and the mouthfeel is also effectively improved.

The computer virus checking and killing system includes independent operation system, virus checking and killing client terminal and remote updating server, and features that the virus checking and killing client terminal adopts the independent operation system as operation platform. The independent operation system is independent on the computer hard disc operation system, will not be infected by the Windows virus, and has independent identification, driving of the computer hardware, boosting the desk environment, network environment monitoring, log-on of Internet and operation of virus checking and killing client terminal. The virus checking and killing client terminal includes virus checking and killing module, virus characteristic library and first communication module. The remote updating server includes new virus characteristic library and the second communication module for communication to the first one and transferring the new virus characteristic library.

The invention discloses a sand selection device used for handmade artwork processing and production, and belongs to the technical field of handmade artwork processing. The problems that existing devices cannot collect dust, and consequently a great amount of dust is generated in the selection process are solved. The sand selection device is technically characterized in that the sand selection device comprises a base, a drive cavity and a shell; the drive cavity is fixedly mounted on the upper portion of the base; a limiting table is fixedly mounted on the drive cavity; the shell is arranged above the limiting table; a sandstone containing frame used for containing sandstone is arranged in the shell; a dust removal assembly used for removing dust is arranged on one side of the shell; a cover plate is arranged at the top of the shell; and a feeding opening is formed in the middle of the cover plate. The sand selection device is provided with the dust removal assembly, dust in sandstone can be fully recycled, cleanliness of sandstone is guaranteed, the processing equipment is also guaranteed, the device is beneficial to worker health, meanwhile, screen blocking is also avoided, and screening efficiency is improved.

An optical fiber preform cutting device comprises a machine tool bed body, an upper drag plate, a preform cutting mechanism, a cutting motor fixed plate connection acting cylinder, a preform clamping mechanism, a power transmission mechanism, an upper drag plate left and right displacement driving mechanism and a preform auxiliary holding and lifting mechanism, wherein the front side of the machine tool bed body is provided with a rack; the top of the front and the rear sides of the machine tool bed body is provided with a bed body guide rail; the upper part of the right end of the machine tool bed body is provided with a bed head box; a left lower tray plate and a right lower drag plate are arranged on the bed body guide rail; the upper drag plate is fixed to the right lower tray plate, and a bracket is arranged above the upper drag plate; the top of the bracket is provided with a cooling water collecting tank; a cutting mechanism bearing seat is arranged in a cavity of the water collecting tank; the end surface of the front end of the upper drag plate is provided with an upper tray plate locking mechanism; the preform cutting mechanism is supported on the cutting mechanism bearing seat; the cutting motor fixed plate connection acting cylinder is supported on the bracket; the preform clamping mechanism is supported on the bed head box; the power transmission mechanism is fixed to the end surface of the right end of the machine tool bed body; the upper drag plate left and right displacement driving mechanism is fixed to the upper tray plate locking mechanism; the preform auxiliary holding and lifting mechanism is arranged on a left lower tray plate, and locked or unlocked with the front side of the machine tool bed body. The device has the advantages that the operation strength is reduced; the cutting efficiency is improved; the case of being picky on the optical fiber preform type is avoided; the environment is protected.

The invention relates to a jack base cleaning machine and belongs to the technical field of metallic workpiece cleaning devices. The jack base cleaning machine comprises an engine base, a cleaning tank, a lifting door driving mechanism, a jack base cleaning bed, a jack base positioning mechanism and an electrical control box, wherein a cleaning medium supply tank is arranged on one side of the engine base, the engine base is provided with a gas storage tank holding chamber and a cleaning medium return tank is arranged at the upper part of the chamber in a spaced manner; the cleaning tank is configured on the engine base, a liquid return hole is formed in a bottom plate of the cleaning tank and a lifting door is arranged on the cleaning tank; the lifting door driving mechanism is arranged on a top plate of the cleaning tank; the jack base cleaning bed comprises a bearing platform base, a jack base bearing platform and more than one cleaning discs; the jack base positioning mechanism is arranged in the cavity of the cleaning tank, and the part, corresponding to the position above the cleaning disc, of the jack base positioning mechanism, is arranged on the top plate of the cleaning tank; the electrical control box is arranged on the outer wall of the cleaning tank, and the lifting door driving mechanism, a cleaning medium supply mechanism and the jack base positioning mechanism are electrically and controllably connected with the electrical control box. The jack base cleaning machine has the advantages that the cleaning efficiency is high, the labor intensity of workers is low, the cleaning quality is guaranteed, the environment of a workplace is improved and the labor cost is reduced.

The invention discloses a bytecode check-based Java intelligent contract safety detection method. The method comprises the following steps of: firstly compiling an intelligent contract safety detection rule by a user, and sending a bytecode file generated by a compiled Java intelligent contract and a customized intelligent contract safety detection rule to an intelligent contract execution engine; after a file is received by the intelligent contract execution engine, dynamically loading a system rule and a user-defined rule by the intelligent contract execution engine; and operating a safety detection program, if the detection fails, returning a result, and if the detection succeeds, entering the execution process and returning an execution result. According to the method, the problem that traditional intelligent contract safety detection is insufficient is solved, the safety of virtual machines and data is ensured, the condition of improperly compiling codes of intelligent contracts can be avoided and the intelligent contract operation performance is improved.