2997results about How to "Avoid pollution" patented technology

The invention provides stamping equipment for automobile engine oil pan production, and belongs to the technical field of oil pan stamping equipment. Which comprises a stamping equipment body and is characterized in that a lower die and an upper die are installed on the stamping equipment body, a first supporting frame is installed on one side of the stamping equipment body, and a second supporting frame is installed on the other side of the stamping equipment body; an automobile oil pan material plate is placed on the top of the first supporting frame. By arranging the auxiliary feeding mechanism and the auxiliary discharging mechanism, the auxiliary feeding mechanism can be utilized, workers do not need to make direct contact with an automobile oil pan material plate, the automobile oil pan material plate can be rapidly and stably transferred to the position between the lower die and the upper die, and accurate alignment can be achieved after transferring, and the automobile oil pan material plate can be reliably placed on the top of the lower die; and compared with a traditional manual handheld plate feeding mode, the feeding device is safer and more reliable.

This invention discloses a primer and probe set, a kit, and their applications for detecting Staphylococcus aureus L based on real-time fluorescence MIRA technology. The primer and probe set consists of single-stranded DNA sequences 1-3. Based on the aforementioned primer and probe set, this invention establishes and optimizes a real-time fluorescence MIRA detection method for Staphylococcus aureus L. Furthermore, the optimized real-time fluorescence MIRA method is innovatively combined with a simplified nucleic acid extraction method and a portable fluorescence detection device, significantly reducing extraction and time costs while enabling rapid on-site detection of the virus, making it particularly suitable for grassroots units and remote areas. In addition, the real-time fluorescence MIRA detection method for Staphylococcus aureus L established in this invention has advantages such as high specificity, high sensitivity, and simple operation. Moreover, the detection process does not require opening the lid, effectively avoiding aerosol contamination, providing an effective technical means for the differential diagnosis and rapid detection of Staphylococcus aureus L.

The invention discloses a material tracking system for battery production, and particularly relates to the technical field of production data traceability, a process topology constraint model is constructed based on a production process, and a material flow expected path is generated; collecting behaviors of the materials in each station to form a material circulation time sequence track; matching the time sequence track with the process topology constraint model to generate a process legality state; controlling association establishment of process data and material identifiers according to a process legality state, and isolating and re-checking data which do not meet constraints; a source identifier is introduced into the process data and is bound with the process legality state, and finally a material production resume record is generated; according to the invention, through process topology constraint and behavior time sequence matching, accurate tracking of material circulation in a dynamic production scene is realized; abnormal path data is prevented from entering associative storage through legality judgment and associative gating; through source identification and resume integration, the traceability and the rechecking reliability capability of the material production process are improved.

The invention discloses a preparation method of a high-stability photoresponse covalent organic framework membrane and application of the high-stability photoresponse covalent organic framework membrane in selective separation of multiple components. 4-azido azobenzene is prepared by carrying out azido reaction on 4-aminoazobenzene in an acidic aqueous solution, and then a BPTA-TAPB-COF membrane is used as a matrix to prepare the high-stability photoresponse covalent organic framework membrane. 4-azido azobenzene is efficiently grafted to the pore wall of the BPTA-TAPB-COF membrane through a click chemical reaction, the photoresponse covalent organic framework membrane is constructed, and the covalent organic framework membrane can be used for multi-component selective separation and is suitable for multi-component systems with different sizes. The azobenzene group in the pore channel of the prepared Azo-COF membrane is subjected to reversible cis-trans isomerization under the irradiation of ultraviolet / visible light, the response speed is high, and the cycle performance is good; the Azo-COF membrane has good application in the light-operated nanofiltration process, the performance of the Azo-COF membrane is not reduced after the Azo-COF membrane is continuously recycled for 12 days, and the structure of the Azo-COF membrane is kept stable.

The utility model discloses an iron chain continuous vibration polishing device which relates to the technical field of iron chain polishing and comprises a vibration frame, a bottom frame and a vertical plate, the bottom frame is installed on the outer side of the vibration frame, a plurality of partition plates are installed in the vibration frame at equal intervals, and vibrator components are symmetrically installed on the front face and the back face of the vibration frame. A vertical plate is installed on the front face of the bottom frame, a controller component is installed on the front face of the vertical plate, a plurality of hydraulic cylinder components are symmetrically installed on the two sides of the vibration frame, the hydraulic cylinder components are in electric signal connection with the controller component, lifting rods are installed at the output ends of the hydraulic cylinder components, and downward pressing mechanisms are arranged on the inner sides of the lifting rods. The pressing mechanism is arranged, the iron chain is moved to the position below the rotary pressing rod, then the hydraulic cylinder component drives the rotary pressing rod to move downwards to press the iron chain into the vibration frame, the iron chain placing mode is simple, a worker does not need to press part of the iron chain into grinding materials manually, labor is saved when the iron chain is placed, and efficiency is high.

The invention relates to the technical field of ferrous metallurgy casting, in particular to a drainage sand removing and recycling method and device. Comprising a mechanical arm, a lifting rotation controller, a controller arm, a sand suction cylinder, a sand conveying pipeline, a sand collecting tank and an injection pump. The lifting and rotating controller is fixedly mounted on the mechanical arm; the controller arm is connected with the lifting and rotating controller, and the lifting and rotating of the controller arm are controlled by the lifting and rotating controller; the sand suction cylinder is connected with the controller arm, the sand suction cylinder is of a U-shaped structure, and one end of the sand suction cylinder is a horn mouth used for sucking drainage sand; one end of the sand conveying pipeline is positioned above the tundish cover sprue gate, and the end part of the sand conveying pipeline is bent downwards to be connected with the other end of the sand suction cylinder; the other end of the sand conveying pipeline is connected with the sand collecting tank; the sand collecting tank is connected with an injection pump pipeline, and the injection pump provides suction power. The ladle filler sand, harmful gas in gaps of the ladle filler sand and a long nozzle and a small part of molten steel in contact with the ladle filler sand in a steel ladle can be discharged out of tundish molten steel and recycled.

The utility model relates to the technical field of pipeline groove grinding, in particular to a pipeline groove grinding integrated device which comprises a placing table and a moving table, two inserting grooves are formed in one end of the placing table, connecting blocks are installed and inserted into the two inserting grooves, the connecting blocks are fixedly connected to one end of the moving table, and the moving table is fixedly connected with the placing table. A dust cover is fixedly connected to the top end of the movable table, a booster water pump is fixedly installed at the top end of the dust cover, the output end of the booster water pump is fixedly connected with the top end of a spraying head and internally communicated with the top end of the spraying head, a water inlet is formed in one side of the booster water pump, and the spraying head is arranged at the inner top of the dust cover. And a plurality of universal wheels are arranged at the bottom end of the moving table. According to the device, the booster water pump drives the atomizing spray head to form water mist, dust particles generated by grinding are wetted, the dust particles are bonded into large particles through surface tension of water, sedimentation is accelerated, and dust diffusion is effectively restrained.

The invention relates to the technical field of plastic forming, and discloses a plastic leftover material forming process of a layered compaction structure, which comprises the following steps: S1, raw material pretreatment: selecting a new plastic material meeting performance requirements, drying, mixing with pretreated recycled material particles in proportion, uniformly stirring, and feeding into a raw material storage tank for later use; s2, melting and injection molding: feeding the mixed raw materials into an injection molding machine, heating in different areas through a charging barrel, and stirring and melting into a melt through a screw rod; the die set is arranged, through an immediate leftover material separation and recovery system, the cut leftover materials can be rapidly recycled, soil and water pollution caused by leftover material accumulation is avoided, meanwhile, waste of plastic raw materials is reduced, and the development concepts of green manufacturing and circular economy are met. Due to the sealing protection design of the die set, pollution caused by melt leakage is avoided, and diffusion of dust and harmful gas is reduced through the sealing structure of the movable groove.

This invention proposes an energy storage-assisted unlocking structure, a socket and connector assembly, and an unlocking method. The energy storage-assisted unlocking structure includes: a locking sleeve; an energy storage push rod slidably inserted within the locking sleeve, with an annular groove on its inner circumferential surface; an energy storage spring abutting against the end of the energy storage push rod, which maintains compressed energy storage during locking and releases to drive the energy storage push rod axially during unlocking; a locking steel ball disposed between the energy storage push rod cavity and the energy storage locking rod, which can move radially; and an energy storage locking rod slidably inserted within the energy storage push rod cavity, which, during locking, forces the locking steel ball into the annular groove for radial limiting and allows the locking steel ball to disengage from the annular groove during unlocking. This invention, through the energy storage push rod and energy storage spring, pre-compresses the energy storage spring to store elastic potential energy during locking and releases this potential energy during unlocking to drive the energy storage push rod to impact the target locking rod, transforming traditional static pull-out unlocking into dynamic impact unlocking. Under overload conditions, only a small operating force is required to complete unlocking, effectively solving the problem of excessive unlocking force or even jamming in existing structures under overload, and significantly improving unlocking reliability.

The application provides a titanium reactor for reducing low-boiling-point impurities at a large cover flange and a use method thereof. The titanium reactor for reducing low-boiling-point impurities at a large cover flange comprises a hollow structure with an open top, a cylinder body, a large cover connected to the top of the cylinder body, a first through hole provided on the large cover along an axial direction, a second through hole cavity provided in a radially direction in a lower convex head of the large cover, and a first through hole communicated with the second through hole cavity; a center tube communicated with an inner cavity of the cylinder body through the first through hole, a distillation tube provided in the second through hole cavity, a heating device provided between the distillation tube and the second through hole cavity, and the distillation tube communicated with the center tube. The application forms two distillation paths in the reactor by adding a transverse distillation channel to the head of the large cover, so that effective distillation of the part below the head of the large cover in the reactor is ensured, and condensation and accumulation of low-boiling-point substances between the head of the large cover and the wall of the reactor are avoided, thereby improving the distillation efficiency and avoiding pollution of products caused by opening the cover.

The application discloses a lightweight high-strength paper meal box suitable for aviation meals, and relates to the technical field of aviation paper meal boxes. The technical points of the application include a lightweight meal box body, a cover body assembling frame, a lightweight meal box cover, and the like. The cover body assembling frame is connected to the middle of the upper end of the lightweight meal box body. The lightweight meal box cover is fastened on the circumferential side of the cover body assembling frame. The four plug-in locking mechanisms are matched with the positioning rod sleeve holes of the cover body assembling frame. The lightweight meal box cover can be stably locked on the meal box body. The fastening is prevented from being loosened due to the shaking of an airplane. Food is prevented from scattering and polluting the environment. The use safety is improved. The three-layer composite lightweight base material is adopted. The outer layer of bamboo pulp fiber paper guarantees the lightweight. The middle layer of honeycomb reinforced core layer improves the structural strength. The inner layer of virgin wood pulp paper guarantees the food contact safety. The perfect balance between the lightweight and the high strength is realized. The meal box meets the requirements of aviation transportation on the weight and durability of tableware.

The utility model relates to coffee machine auxiliary equipment technical field, specifically is a kind of coffee machine brewing device outlet structure, comprising: funnel-shaped outlet pipeline and its columnar output end, output end is connected with the communication sleeve of sealing ring belt, and is connected with waste water collection tank through telescopic hose, outlet pipeline side wall inserts food-grade cleaning agent tank, manually lifting type pump pressure mechanism is equipped in tank, and push cleaning fluid enters pipeline flushing through the opening and closing mouth of hinged sealing sheet control, waste liquid is introduced into collection tank in orientation. The device realizes efficient cleaning, waste water zero pollution, and convenient operation, applicable to various coffee machines.

This utility model relates to the field of stretching instruments, and more particularly to a stable stretching structure for a stretching instrument. The technical problem is that existing stretching instruments use clamping structures that do not hold the fabric tightly, allowing knitted fabrics to easily slip off the clamps during stretching. The technical solution is a stable stretching structure for a stretching instrument, comprising a body, a through groove, a tension sensor, a fixed end platform, a linear motor and a moving end platform, a dust curtain, a stretching fixing component, and a measuring scale. This utility model replaces the clamps on the original stretching instrument with a stretching fixing component, providing better fixation for both ends of the knitted fabric and preventing it from easily slipping off during stretching, thus ensuring the normal conduct of the stretching test. The dust curtain reduces the possibility of external dust entering the machine body during use, preventing contamination of internal electrical equipment. This solves the problem of existing stretching instruments using clamping structures that do not hold the fabric tightly, allowing knitted fabrics to easily slip off the clamps during stretching.

The application provides a preparation method of a diphenylfluorene polyether. The method uses diphenylfluorene as a substrate, butylene oxide as an epoxide monomer, toluene as an organic solvent, and under the action of a composite catalyst, reacts at 110-200 DEG C for 2-6 hours to obtain the diphenylfluorene polyether. The composite catalyst is obtained by reacting a porous aromatic skeleton with a bromoalkyl quaternary ammonium salt to obtain a quaternary ammonium salt functionalized porous aromatic skeleton, and finally, a basic catalyst is limitedly encapsulated in the pore channel of the quaternary ammonium salt functionalized porous aromatic skeleton by electrostatic attraction. The catalyst of the method can be recycled and reused, and the yield retention rate is greater than or equal to 92% after the composite catalyst is used for 5 cycles, and the method is suitable for optical display, high-frequency circuit board, semiconductor packaging and other fields.

This invention relates to the field of vapor phase etching (VPE) apparatus technology, specifically a double-sided VPE apparatus for semiconductor silicon wafers. The apparatus includes a VPE apparatus body, a silicon wafer transfer mechanism at the upper end of the apparatus body, an etching chamber fixedly mounted on the outer side of the apparatus body, and a mounting base fixedly mounted on the upper end of the etching chamber. By combining the VPE mechanism with a central air-guiding mechanism, stable adsorption of the semiconductor silicon wafer is ensured during the etching process, avoiding vibration and improving etching efficiency and precision. A Bernoulli-style chuck structure is formed by the cooperation of the air-guiding support stage and the central stage, stably "fixing" the silicon wafer above the air-guiding support stage, minimizing contact with the semiconductor silicon wafer, avoiding physical damage and contamination, and simultaneously enabling multi-directional airflow distribution to meet auxiliary heat dissipation needs for the semiconductor silicon wafer, further improving the accuracy and etching efficiency of the VPE process.

This utility model relates to the field of building engineering technology and discloses a wall drilling device for building engineering. It includes an electric hammer body, a drill bit for drilling is provided at the left end of the electric hammer body, and a sleeve is provided on the outside of the right end of the electric hammer body. Connecting rods are fixedly connected to both the front and rear ends of the sleeve. A U-shaped plate is fixedly connected to the upper left side of the connecting rods. The lower side of the U-shaped plate fits tightly against the upper left side of the electric hammer body. An elastic component is provided in the middle of the U-shaped plate, and a movable rod is movably provided inside the left end of the connecting rods. In this utility model, during drilling, the protective cover and support strip can be pushed tightly against the wall by a spring. The protective cover covers the drilling area, and the support strip increases the contact area with the wall, making it easier for operators to determine whether the drill bit is perpendicular to the wall, thus ensuring consistent verticality. Simultaneously, it can block most of the flying dust during drilling, avoiding dust pollution.

The utility model relates to a kind of lead-acid battery plate production technical field, specifically related to a kind of lead-acid battery plate coating device. Including frame, two symmetrical coating mechanisms of upper and lower setting are installed in frame one side, and roller mechanism is installed on the frame of coating mechanism side, it is characterized in that, two supporting rollers are rotatably arranged on the frame of roller mechanism side, outer smearing edge mechanism, inner smearing edge mechanism and cleaning mechanism are sequentially arranged between the two supporting rollers. The device integrates coating, rolling, smearing and cleaning functions, and the full-process treatment of coating can be completed by single pass of the grid, avoiding deformation or pollution of lead paste caused by multiple handling, significantly improving the production yield and efficiency of the plate.

The utility model discloses a lithium ion battery fluid collecting device, and belongs to the technical field of lithium ion battery detection auxiliary equipment. The device is provided with a gas collection chamber, a puncture device arranged at the gas inlet end of the gas collection chamber, and an exhaust soft rubber sealing joint arranged at the exhaust end of the gas collection chamber, the flexible glue adsorption head is mounted at the bottom end of the puncturing device and is used for being adsorbed on the surface of the lithium ion battery in a sealing manner; the bottom end of the puncture device is provided with a puncture needle capable of penetrating into a closed cavity formed by the flexible glue adsorption head and the surface of the lithium ion battery, and the bottom end of the puncture device is further provided with an adjusting device which can be penetrated by the puncture needle and is used for compensating the length of the puncture device. The gas collecting device has the advantages of being simple in structure, convenient to operate and high in gas collecting efficiency.

The application discloses a double-membrane water treatment system, which comprises a front ultrafiltration assembly and at least one reverse osmosis assembly; the front ultrafiltration assembly is provided with an ultrafiltration water tank; the reverse osmosis assembly is connected to the downstream of the ultrafiltration water tank and is provided with a water tank; the water production side and the concentrated water side of the reverse osmosis assembly are respectively connected to a discharge flow path; a shunt device provides a first discharge flow path and a second recovery flow path for flushing water from the reverse osmosis assembly; the first discharge flow path is connected to an external discharge point of the system; the second recovery flow path is connected to the water tank or the ultrafiltration water tank in the system; a control unit receives an operating state signal of the reverse osmosis assembly to control the shunt device to selectively guide the flushing water to the first discharge flow path or the second recovery flow path; in a flushing state, the shunt device guides the flushing water to the second recovery flow path; and in a chemical cleaning state, the shunt device guides the flushing water to the first discharge flow path. The scheme realizes recycling of high-quality flushing water and improves the recovery rate of the system.

This utility model relates to the field of ultrafiltration membrane equipment technology, and discloses an ultrafiltration membrane device for milk production, including a frame with crossbars fixedly connected to both the upper and lower ends of the frame. This ultrafiltration membrane device for milk production, through a shock-absorbing mechanism, involves first installing a shock-absorbing filter frame through the filter tube onto the inside of the crossbars when the device is to be used. A rubber shock-absorbing ring is installed in the middle of the shock-absorbing frame, which is initially fixed to the outside of the filter tube. Then, a shock-absorbing spring is installed outside the rubber shock-absorbing ring. To ensure shock absorption while protecting the filter tube, foam cotton is filled outside the shock-absorbing spring and inside the shock-absorbing frame for shock absorption protection. This effectively reduces vibration and shaking outside the filter tube, preventing the connection between the filter tube and other parts of the equipment from gradually loosening due to vibration, which could lead to milk leakage, waste of raw materials, contamination, interference with the normal operation of the ultrafiltration process, and reduced production efficiency.

This utility model discloses a material feeding device for the modification of nano-calcium carbonate, including a storage tank. A cover plate is fixedly installed on the upper surface of the storage tank by multiple first bolts. A sealing gasket is fixedly installed on the bottom wall of the cover plate. A rotating shaft is rotatably installed on the bottom wall of the cover plate. A motor connected to the rotating shaft is fixedly installed on the upper surface of the cover plate. Multiple stirring blades are fixedly installed on the outer wall of the rotating shaft by a mounting sleeve. Each stirring blade is inclined. By setting up components such as a rotating shaft, stirring blades, connecting rods, and scrapers, this utility model allows the stirring blades to rotate when the rotating shaft drives them to rotate. The adjacent stirring blades with opposite inclination directions can form a bidirectional shearing force on the nano-calcium carbonate, effectively breaking up agglomerates and avoiding conveying blockages caused by agglomeration, thus improving the continuity of feeding. At the same time, the scraper rotates with the rotating shaft against the inner wall of the storage tank, which can promptly scrape off the material adhering to the wall, reducing material loss and cleaning difficulty.

The application provides a kind of biological organic fertilizer efficient aerobic fermentation device, it relates to organic fertilizer fermentation technical field, including: base;The base is fixed with support, the upper portion of support is hinged with baffle, and support is installed with screw rod lifting seat A and screw rod lifting seat B by bolt, and the screw rod in screw rod lifting seat A and screw rod lifting seat B is connected with the lower end of baffle by pin shaft, and the input shaft of screw rod lifting seat A is connected with the input shaft of screw rod lifting seat B with connecting rod;The application integrates stirring, oxygen supply, fungicide spraying, material conveying, waste gas treatment and other multiple functions, forms complete fermentation process system, through the collaborative work of each hydraulic rod, motor and transmission mechanism, can be flexibly adjusted according to different material characteristics and fermentation process parameters, is suitable for efficient fermentation production of various biological organic fertilizer, has strong environmental adaptability and process expandability, helps to improve the automation level and product quality stability of organic fertilizer production.

The utility model discloses an automobile washer with a backflow prevention function, and relates to the field of automobile washers. The automobile washer with the backflow prevention function comprises a washer unit and a backflow prevention unit. The backflow preventing unit is composed of a sleeve, a valve seat, a movable disc, a connecting rod, a valve plate, a spring and a collecting tank. The washer unit comprises a water tank, a connecting pipe, a water pump and an output pipe. The two ends of the sleeve are communicated with the connecting pipe and the output pipe respectively. According to the automobile washer with the backflow prevention function, through the synergistic effect of the valve seat, the movable disc, the valve plate and the spring, when the washer works normally, water flow pushes the movable disc and the valve plate to move, and the water flow smoothly passes through the washer; when the automobile washer stops working, the elastic force of the spring enables the valve plate to abut against the valve seat rapidly and tightly, washing liquid is prevented from flowing back, pollution to other parts in a system caused by the flowing-back liquid is effectively avoided, cleanliness of the washing liquid is guaranteed, and the overall performance of the automobile washer is improved.

The utility model discloses a formation and capacity grading negative pressure device which comprises an argon bottle, a vacuum generator and a gas washing bottle, the argon bottle is communicated with the vacuum generator through a first pipeline, and the vacuum generator is communicated with the gas washing bottle through a second pipeline. And the vacuum generator is used for converting gas in the argon bottle from positive pressure to negative pressure. And a second gas valve is mounted on the first pipeline between the argon bottle and the vacuum generator. And an air filter is arranged on the second pipeline between the vacuum generator and the gas washing bottle. The argon bottle provides a gas source, the gas source is converted into negative pressure through the vacuum generator, and waste gas generated during formation and capacity grading of the sodium-ion battery is pumped out. Meanwhile, argon is used as protective gas to effectively prevent waste gas of the battery cell from polluting an interface, so that various properties of the battery cell are improved. And the whole module is simple in structure, modular operation can be realized, and the cost is relatively low while the production efficiency of the battery cell is improved.

The utility model discloses a kind of endoscope surgery pasting film, it is related to medical supplies technical field, including first film, second film, water baffle and liquid collecting and guiding bag.The bottom surface of first film is used to paste on skin.Second film is located on the top surface of first film, and the accommodating cavity that is formed with upward protrusion between second film and first film.Water baffle is located in accommodating cavity, and the region formed by surrounding water baffle is used to accommodate liquid.Liquid collecting and guiding bag is connected with one side of second film, and the bag opening of liquid collecting and guiding bag is towards the opening of water baffle, so that the liquid in the region formed by surrounding water baffle can flow into liquid collecting and guiding bag.In the process of operation by doctor, water baffle can be resisted by second film with physiological saline and patient's blood and other liquids, that is, water baffle plays a blocking role to liquid, so that liquid in the process of operation all stays in the region formed by surrounding water baffle, avoid the pollution of the surrounding environment of operation area.

A robot sweeper includes a main body, a pair of drive modules, and a cleaning module. The drive modules are respectively pivotally connected to the main body. The drive modules include a roller set and a drive device. The drive device is mechanically connected to the roller set and configured to drive the roller set to rotate about a first axis. The cleaning module is connected to the main body and at least partially located between the roller sets along the first axis.

The utility model discloses a kind of unpowered fan with dust removal function, belong to unpowered fan technical field, including mounting plate and unpowered fan, the top surface of the mounting plate is fixedly connected with air inlet tube, the top surface of the air inlet tube is fixedly connected with fixed disc with the lower end of unpowered fan, two arc holes are symmetrically provided on the side of the air inlet tube, the inside of the arc hole is clamped with arc block, the inner wall of the arc block is fixedly connected with circular ring, annular groove is provided in the inner wall of the air inlet tube, and annular groove is connected with arc hole, the circular ring is slidably extended to the inside of annular groove, the inside of the circular ring is fixedly connected with dust removal net, the dust removal net is slidably extended to the inside of air inlet tube. Compared with prior art, the device can effectively filter dust in the air sucked by the unpowered fan, thereby preventing pollution in the factory building or greenhouse.

The utility model relates to the technical field of grinding machine, especially to a kind of anti-sputtering floor grinding machine.The technical scheme thereof includes support seat and shell, the support seat upper surface is fixedly installed with shell, the shell outer surface both sides position is fixedly installed with protective cover, two the protective cover inside is provided with grinding wheel, two the protective cover front surface is provided with opening, two the protective cover front side is located in opening position is set from top to bottom with two air curtain cover, the support seat inside is fixedly installed with exhaust fan, the exhaust fan input is fixedly connected with dust filter, the dust filter tail end is fixedly connected with dust suction pipe, the dust suction pipe tail end is fixedly connected with dust suction connecting pipe.The utility model can effectively avoid particulate matter splashing during the process of floor grinding machine grinding workpiece, and simultaneously play the role of dust removal, thereby avoiding pollution working environment, also avoiding particulate matter flying into the eye of operator to cause discomfort and harm.

The utility model discloses a sampling device for food quality detection belongs to food detection technical field, and its technical scheme main points include sampling cylinder, the top of sampling cylinder is provided with the top cover, the bottom of top cover is provided with cutting mechanism, the bottom of sampling cylinder is provided with the bottom cover, the bottom of sampling cylinder is provided with support mechanism, the cutting mechanism includes pressing block, spring, sliding rod and cutting cylinder, the bottom of pressing block is fixedly connected with the top of sliding rod, the sliding rod slidingly inserts inside the top cover, the surface of spring is movably sleeved in the sliding rod, the top of spring is in contact with the bottom of pressing block, the bottom of spring is in contact with the top of top cover, the structure of the food sampling of existing part is solved, especially when the quality of vegetable food is detected, it is more inconvenient, still needs manual cutting sampling with blade, and the efficiency is lower, and the problem that sample pollution is easily caused is solved.

The utility model belongs to heat exchange technical field, especially relates to a kind of heat exchange tube, it includes tube body, tube sheet, tube bundle and pipe box, tube sheet and tube body are constituted and are used for containing heat exchange medium heat exchange cavity;Tube bundle is set in heat exchange cavity, and both ends of tube bundle are all through tube sheet and extend to the outside of heat exchange cavity, and tube bundle is used to make injection liquid flow through heat exchange cavity, so that injection liquid and heat exchange medium carry out heat exchange;Pipe box is set in the end of tube bundle, and have the shunt cavity with one end of tube bundle communication and the convergence cavity with other end communication.Penetrate tube sheet both ends of tube bundle, and pipe box is set in the end of tube bundle, to be able to make certain gap between pipe box and tube sheet, to be able to avoid the heat exchange medium in heat exchange cavity interior by the connecting part of tube bundle and pipe box enter the interior of pipe box, to avoid heat exchange medium and injection liquid between mixing, further to be able to avoid injection liquid appear pollution.