34results about How to "Avoid attaching" patented technology

The invention discloses a transformer forced water circulation cooling system. The transformer forced water circulation cooling system comprises a cooling apparatus connected with the transformer and used for cooling oil in the transformer by cooling water, a water supplementing apparatus connected with the cooling apparatus and used for supplementing water for the cooling apparatus, and a signal detection apparatus arranged on the cooling apparatus, the water supplementing apparatus and the transformer and used for detecting the water temperature in the cooling apparatus and the water supplementing apparatus and the oil temperature in the transformer. By taking the temperatures indicated by an oil surface temperature indicating meter and a winding temperature indicating meter on the transformer as the basis for switching of the cooling equipment, internal temperature change of the transformer can be reflected effectively, an additional temperature measurement apparatus also can be avoided, and the hardware cost of the control system is lowered; and the control method is simple and concise in logic and a large amount of calculation in the control process is not needed, so that control response is high in speed, the control system is simple and convenient to operate, and the method is applicable to actual operation of the substation.

The invention mainly relates to the field of automobile structures and safety of automobiles, in particular to a turnover integral chair for children. The chair for children is arranged between two chairs for adults of the back of an automobile, a chair back plate and back plates of the chairs for adults on two sides of the chair for children are coplanar, and a headrest for children and a chair backrest for children are disposed on the chair back plate; the lower end of the chair backrest for children is hinged with the lower section of a middle backrest of the chair via a second backrest angle adjusting mechanism, and the lower section of the middle backrest of the chair is hinged with the upper section of the middle backrest of the chair via a first backrest angle adjusting mechanism; both the first backrest angle adjusting mechanism and the second backrest angle adjusting mechanism are provided with self-locking structures; and a five-point type safety belt is respectively arranged on the inner side of the lower section of the middle backrest of the chair and the inner side of the upper section of the middle backrest of the chair. The height, the angle and the position of the chair can be adjusted according to characteristics of the heights and the bodies of passengers at different ages, so that protection requirements to people at different ages can be met, and the turnover integral chair can be used for protecting the most of passengers.

The invention discloses a feeding and reclaiming manipulator. The structure of the feeding and reclaiming manipulator comprises a support base, a free arm and a clamp; the free arm is installed at theupper end of the support base; the clamp is installed at the upper end of the free arm; the clamp comprises a roller, a support block, a piston, a clamping block and a push block; the clamping blockcomprises a rolling groove, scraping block, a rolling shaft, a threaded rod, and a threaded clamp body; the scraping block comprises a fixed base, a movable groove and a scraping body; and the scraping body comprises a fixed rod, a main rod, a rotating shaft, a scraping rod, and an elastic telescopic rod. According to the feeding and reclaiming manipulator provided by the invention, the threaded rod drives the scraping block to rotate, so that the inertia generated by the rotation of the scraping body can drive the scraping rod to turn outwards, so that the scraping rod can scrape off debris adhered to the clamping block, so that debris generated by punching is prevented from being attached to the end face of the clamp, a gap between a circuit board and the clamp is avoided, and a drillingmachine can accurately punch the circuit board.

The invention discloses a capsaicin-like compound and a preparation method and use thereof. The capsaicin-like compound has a molecular formula of C27H21N2O9F3ClBrR. 4-bromo-2-(4-chlorophenyl)-5-trifluoromethylpyrrole-3-nitrile, capsiate and glucurnic acid as raw materials are dissolved in a benzene solvent, the solution undergoes a catalytic backflow reaction for 4-8h, the reaction product is washed and dried, and the dried product is subjected to distillation and recrystallization. The preparation method utilizes the easily-available raw materials and has a low cost and a high yield. The capsaicin-like compound as an antifouling agent can be fast degraded in a seawater environment, has small influence on marine organisms, is difficultly accumulated in organism, and has low toxicity, good antifouling effects and a long service life.

The invention discloses a geotechnical centrifuge driven by a synchronous belt transmission device. The geotechnical centrifuge driven by the synchronous belt transmission device comprises a main shaft and a motor which are mounted vertically; a rotating arm is horizontally arranged at the upper end of the main shaft; a large belt wheel is arranged at the lower end of the main shaft; a rotating shaft of the motor is provided with a small belt wheel; the small belt wheel is in transmission connection with the large belt wheel through a synchronous belt; two tensioning wheels are arranged on the outer side of the synchronous wheel. According to the geotechnical centrifuge driven by the synchronous belt transmission device, a layered construction structure which is driven by adopting the motor or driven by the motor and a speed reducer in the prior art is changed, and the construction cost is lowered; the requirement on continuously supplying a large amount of water, oil and gas to the rotating arm through an inner hole of the main shaft when the centrifuge operates can be met; the synchronous belt has certain effects on vibration damping and noise reducing; an additional acting force generated by imbalance of the rotating arm or vibration of a vibrating table can be absorbed to a certain degree, and the impact on a construction foundation caused by the additional acting force is reduced; the synchronous belt is reliable in work, simple in structure, and convenient to maintain and replace.

The invention provides a coastal desert solar power generation and dew collection and utilization device, and the device comprises a device main body, wherein a plurality of solar cell panels connected in series are arranged on the device main body, and deserts on the back surfaces of the solar cell panels are used for planting plants; a dew collection device which is installed on the device bodyand used for collecting dew condensed on the solar cell panel at night and irrigating plants with the collected dew. According to the invention, the solar cell panel is used for multiple purposes in acyclic manner; on the one hand, the device generates power for water lifting irrigation or illumination and the like, solves the problem that no electric power is matched in remote desert areas; on the other hand, the device supplements water required by plant growth by collecting dew, reduces the environment temperature of plant growth by shading, and relieves the high-temperature inhibition effect of strong sunlight in the desert areas on plant growth. By using the device, new energy is increased by greater than 50%, water sources are increased by 20%, and crop growth is promoted. And the problems that coastal deserts are dry, raining is little, electric power matching is lacked, and soil desertification areas exist are solved.

The invention discloses a soil remediation system for environment-friendly landscaping maintenance. The soil remediation system structurally comprises a treatment box, a screening box, a soil inlet cavity, a connecting pipe shaft and walking crawler belts; the screening box is fixed at the bottom of the treatment box; the screening box is connected with the soil inlet cavity through the connectingpipe shaft; the walking crawler belts are mechanically connected to two sides of the bottom of the screening box; a walking ring, two inclined plates, a guide outlet and a stirring shaft are arrangedin the treatment box; the walking ring is mounted at the just upper end of the treatment box; two inclined plates are fixed at two sides of the inner wall of the treatment box by mechanical connection. The inclined plates, a first spray thrower and a second spray thrower are arranged, the first sprayer and the second sprayer are distributed in a central symmetry mode relative to the walking ring,a remediation liquid sprayed by atomization openings is sprayed out in a parabola mode and acts on the inclined plates, and thus the impact force of the remediation liquid acting on soil is reduced,material-liquid separation is achieved, and the situation that the sprayers are blocked due to splashing during spraying can be effectively avoided.

The invention discloses a preparation method of a high-precision stainless steel product. The method sequentially includes the following steps that S1, stainless steel powder and tungsten carbide powder are mixed and then are subjected to ball-milling mixing by the aid of a ball mill, and mixed stainless steel powder is prepared; S2, acrylate monomers, zinc oxide, phosphoric acid, nitric acid, a silane coupling agent KH-570, polyethylene glycol and tributyl borate are evenly mixed and then are heated in a water bath, then vinyl fluoride, sodium fluoride, sodium nitrate, nickel sulfate, sodiumpersulfate, polypropylene resin, barium metaborate, tetrabromobisphenol A, nano calcium carbonate, methyl triethoxysilane and an antibacterial aid are added to the mixture, the mixture is evenly stirred, is subjected to heat preservation and then is cooled to the room temperature, hydrogenated polydecene is added to the mixture, and a binder is prepared; S3, the prepared mixed stainless steel powder and the prepared binder are mixed and then are subjected to injection molding and degreasing treatment in warm water, then high-temperature sintering is performed, and a finished product is prepared. The stainless steel prepared with the method has the excellent anti-corrosion, flame-retardant and anti-bacterial properties.

The invention discloses a chipless cutting machine which comprises a rack and a controller. A bracket is mounted on the rack in a front-and-back movable mode; a bearing plate is fixedly arranged on the bracket; a compressing device is arranged on the bearing plate; the compressing device is controlled by a controller; a fixed cutting tool is fixedly arranged on the bearing plate; a power tool rest is mounted on the bracket in a left-and-right movable mode; a power cutting tool and a driving device are mounted on the power tool rest; the driving device is controlled by the controller; the power cutting tool is a blade which is of a cone-frustum-shaped structure, and is positioned at the upper part of the fixed cutting tool; a fan is fixedly arranged on the rack; the fan is electrically connected wiht the controller, and a wind suction pipe is arranged on the fan; one end of the wind suction pipe is connected with the fan, the other end of the wind suction pipe is fixedly arranged on the power tool rest, and the wind suction pipe is towards the power cutting tool. The chipless cutting machine disclosed by the invention is used for cutting of a foamed sheet, has the characteristics of simple structure, high cutting quality, high cutting efficiency, low equipment cost and high automation degree, does not generate noise or dust in the cutting process, and is energy-saving and environmental-friendly.

The invention relates to the technical field of die machining, in particular to a slotted hole cleaning device for die machining. Two base plates are connected to a supporting base, a roller set is arranged on each base plate, each roller set is connected with a transmission belt, a U-shaped clamping piece is connected to the outer wall of each transmission belt, each roller set is composed of a first roller, a second roller, a third roller and a fourth roller, and the first roller, the second roller, the third roller and the fourth roller are all rotationally connected with the base plates. According to the device, the slotted hole is cleaned by rotating a downward moving brush, chippings are brought out in the downward moving process, and the chippings are thrown out under the action of centrifugal force in the rotating process of the brush, so that the chippings are prevented from being attached to bristles and adhering to the wall of the slotted hole again when the brush rotates and moves upwards; and the connecting line of the center points of the first roller, the second roller, the third roller and the fourth roller is arranged to be in an isosceles trapezoid shape, and therefore the die can be conveniently placed between the two U-shaped clamping pieces or taken out from the position between the two U-shaped clamping pieces.

The invention belongs to the technical field of lipstick tube pattern printing, and particularly discloses a lipstick tube pattern printing device with a drying function. The lipstick tube pattern printing device comprises a rack, wherein support columns are arranged at the bottom of the rack; conveying wheels are rotationally connected to two ends of the rack; a conveyor belt coats the conveying wheels; a plurality of clamping grooves are arranged in the outer side of the conveyor belt; positioning mechanisms for fixing lipstick tubes are arranged in the clamping grooves; the rack is sleeved with a housing, and the bottom end of the housing is fixedly connected to the sides of the support columns; a lifting cylinder is arranged at the top of the housing, and the piston end of the lifting cylinder is inserted into the housing and fixedly provided with a printing head used for printing the lipstick tubes; and a drying mechanism is arranged at the bottom of an inner cavity of the housing and at the right side of the printing head. According to the lipstick tube pattern printing device, the lipstick tube is clamped between two clamping plates under the action of elastic sheets, the stability of the lipstick tube can be improved, and the lipstick tube is not prone to moving in the printing process; and through the arrangement of the drying mechanism, the printing ink can be rapidly air-dried, and the printing ink is not prone to being scratched.

The embodiment of the invention discloses high-frequency electrosurgical equipment. The electrosurgical equipment comprises a working box, wherein sockets are formed in the working box, the peripheryof each socket is fixedly provided with a fixed rubber block extending out of the working box, and the working box comprises an upper shell and a lower shell; the fixed rubber blocks are arranged on the wall between the upper shell and the lower shell, the upper shell and the lower shell are fixedly connected through screws, and dustproof plastic covers for shielding the sockets are fixedly arranged on the fixed rubber blocks. When the electrosurgical equipment does not need to be used, plugs need to be pulled out of the wire sockets to prevent electricity leakage; the fixed rubber blocks arefixedly arranged so that the dustproof plastic covers can cover the fixed rubber blocks, then the sockets cannot be exposed in the air, dust in the air is prevented from adhering to the sockets, and normal operation of the working box is guaranteed.

The invention belongs to the technical field of desulfurization equipment, and specifically relates to a glass fiber reinforced plastic desulfurization tower using waste heat power to remove slag, including a sedimentation heat exchange chamber, a pressurized fan is arranged on one side of the sedimentation heat exchange chamber, and the sedimentation heat exchange chamber On the other side of the chamber and at a position 90 degrees from the pressurized fan, a cooling water tank is provided. The desulfurization tower main body is provided on the side of the cooling water tank away from the sedimentation heat exchange chamber, and the side of the sedimentation heat exchange chamber is away from the cooling water tank. A smoke inlet component is provided. In the present invention, the packing layer and the main body of the desulfurization tower are fixed by connecting components. The connecting component includes a support frame, a connecting port, a connecting hole, a connecting plate and a connecting bolt. When assembling, the packing layer is put into the groove of the connecting plate, and then the The packing layer is pushed into the top of the support frame through the connection port until the connecting bolts of the connecting plate stop connecting with the connecting holes. This structure is easy to disassemble and replace the packing layer regularly, and can treat the dust in the flue gas, improving the treatment efficiency. quality.

The invention provides a pressure boosting device of a hydraulic system. The pressure boosting device comprises a hydraulic motor, a hydraulic pump, an oil tank and an energy accumulator, wherein oil flows into the motor from a pipeline to drive the motor to rotate; the pump pumps the oil from the oil tank into the energy accumulator, a certain amount of pressure is inflated into the energy accumulator in advance, an output shaft of the motor is connected with an input shaft of the pump, the hydraulic motor rotates to drive the hydraulic pump to rotate, and the discharge capacity of the hydraulic motor is larger than that of the hydraulic pump so that the large discharge capacity motor drives the small discharge capacity pump to convert low-pressure oil from a pipeline into high-pressure oil to be stored in the energy accumulator. By means of the pressure boosting device of the hydraulic system, surplus energy such as potential energy in the system can be conveniently converted into hydraulic energy to be stored, and the hydraulic energy is supplied to the system when the system needs more energy, so that environment-friendly and economical effects are achieved; the stored energy can be used as a high-pressure source to provide high-pressure oil for the hydraulic system, so that addition of a single high-pressure pump is avoided, the size of the system is reduced, and costs are reduced.

The invention belongs to the technical field of solar water heaters, and particularly relates to a solar water heater with a solar photovoltaic power generation system. The solar water heater comprises a water tank, a heat collection pipe, a supporting plate, a frame body and a controller, wherein the water tank is rotationally connected to the upper portion of the supporting plate, and the end, away from the water tank, of the heat collecting pipe is inserted into the frame body. the solar water heater is further provided with a rotating module, wherein a placing platform is arranged on the right side of the water tank, and the motor is fixedly connected to the placing platform through bolts. Two rotating rollers are fixedly connected with photovoltaic power generation panels correspondingly, and the photovoltaic power generation panels generate power and are used for heat preservation of the water tank. A sunlight sensor is arranged on the front end surface of the frame body. The sunlight sensor senses the angle of the sun and sends a signal to the controller so as to control the motor to rotate, the motor drives the rotating rollers to rotate, and the rotating rollers drive the water tank, the heat collecting pipe, the frame body and the photovoltaic power generation panels to rotate, so that the heat collecting pipe is always located in a relatively large illumination area, and the energy utilization rate of sunlight is increased.

The invention discloses a capsaicin-like compound and a preparation method and use thereof. The capsaicin-like compound has a molecular formula of C27H21N2O9F3ClBrR. 4-bromo-2-(4-chlorophenyl)-5-trifluoromethylpyrrole-3-nitrile, capsiate and glucurnic acid as raw materials are dissolved in a benzene solvent, the solution undergoes a catalytic backflow reaction for 4-8h, the reaction product is washed and dried, and the dried product is subjected to distillation and recrystallization. The preparation method utilizes the easily-available raw materials and has a low cost and a high yield. The capsaicin-like compound as an antifouling agent can be fast degraded in a seawater environment, has small influence on marine organisms, is difficultly accumulated in organism, and has low toxicity, good antifouling effects and a long service life.

A device is described for treating synthetic threads in a melt spinning process having a plurality of treatment devices arranged in separate treatment chambers. The treatment chambers are connected to one another via a thread opening and have separate doors for opening and closing. In order to achieve the simplest possible operability when a process starts, the doors are coupled according to the invention by an adjustable holding means in such a manner that the doors can be operated together as one unit or separately from one another, depending on the position of the holding means.

The invention provides a coastal desert solar power generation and dew collection and utilization device, and the device comprises a device main body, wherein a plurality of solar cell panels connected in series are arranged on the device main body, and deserts on the back surfaces of the solar cell panels are used for planting plants; a dew collection device which is installed on the device bodyand used for collecting dew condensed on the solar cell panel at night and irrigating plants with the collected dew. According to the invention, the solar cell panel is used for multiple purposes in acyclic manner; on the one hand, the device generates power for water lifting irrigation or illumination and the like, solves the problem that no electric power is matched in remote desert areas; on the other hand, the device supplements water required by plant growth by collecting dew, reduces the environment temperature of plant growth by shading, and relieves the high-temperature inhibition effect of strong sunlight in the desert areas on plant growth. By using the device, new energy is increased by greater than 50%, water sources are increased by 20%, and crop growth is promoted. And the problems that coastal deserts are dry, raining is little, electric power matching is lacked, and soil desertification areas exist are solved.

The invention belongs to the technical field of electronic devices, and particularly relates to a preparation method of a glass cover plate, the glass cover plate and a mobile terminal.The method comprises the steps that a glass base material is cut, and the cut glass base material is obtained; carrying out chemical thinning treatment on the cut glass substrate to obtain a thinned glass substrate; carrying out coating treatment on the thinned glass base material to obtain a coated glass base material; and carrying out coating treatment on the coated glass substrate to obtain the glass cover plate. According to the method disclosed by the invention, an arbitrarily-folded ultrathin flexible glass cover plate product with high toughness, explosion resistance, scratch resistance, aging resistance, high hardness and no crease can be prepared, and the glass cover plate prepared by the method disclosed by the invention can also be matched with folding screen mobile phones of various manufacturers for application and has a wide market prospect.

The invention relates to a traditional Chinese medicine raw material dicing device capable of reducing breakage rate. The traditional Chinese medicine raw material dicing device capable of reducing the breakage rate comprises a machine frame, wherein a conveying belt is installed on the machine frame, two dicing cutters distributed in a right angle shape are arranged on the conveying belt, cutterfaces of the dicing cutters are perpendicular to the belt face of the conveying belt, the dicing cutters are connected with an adjustment mechanism A, the adjustment mechanism A is used for adjustingthe two dicing cutters to respectively advance to cut flaky medicine materials in corresponding cutting directions, and the cutting direction of each dicing cutter is parallel to the cutter face of each dicing cutter, and inclines down and points to the direction of the conveying belt. The traditional Chinese medicine raw material dicing device capable of reducing the breakage rate is stable in structure, reasonable in layout, stable in running, capable of achieving continuous dicing processing for traditional Chinese medicine raw materials, and capable of effectively reducing the dicing breakage rate, and meets current use requirements.

The invention relates to a traditional Chinese medicine raw material dicing device capable of reducing breakage rate. The traditional Chinese medicine raw material dicing device capable of reducing the breakage rate comprises a machine frame, wherein a conveying belt is installed on the machine frame, two dicing cutters distributed in a right angle shape are arranged on the conveying belt, cutterfaces of the dicing cutters are perpendicular to the belt face of the conveying belt, the dicing cutters are connected with an adjustment mechanism A, the adjustment mechanism A is used for adjustingthe two dicing cutters to respectively advance to cut flaky medicine materials in corresponding cutting directions, and the cutting direction of each dicing cutter is parallel to the cutter face of each dicing cutter, and inclines down and points to the direction of the conveying belt. The traditional Chinese medicine raw material dicing device capable of reducing the breakage rate is stable in structure, reasonable in layout, stable in running, capable of achieving continuous dicing processing for traditional Chinese medicine raw materials, and capable of effectively reducing the dicing breakage rate, and meets current use requirements.

The invention discloses a geotechnical centrifuge driven by a synchronous belt transmission device. The geotechnical centrifuge driven by the synchronous belt transmission device comprises a main shaft and a motor which are mounted vertically; a rotating arm is horizontally arranged at the upper end of the main shaft; a large belt wheel is arranged at the lower end of the main shaft; a rotating shaft of the motor is provided with a small belt wheel; the small belt wheel is in transmission connection with the large belt wheel through a synchronous belt; two tensioning wheels are arranged on the outer side of the synchronous wheel. According to the geotechnical centrifuge driven by the synchronous belt transmission device, a layered construction structure which is driven by adopting the motor or driven by the motor and a speed reducer in the prior art is changed, and the construction cost is lowered; the requirement on continuously supplying a large amount of water, oil and gas to the rotating arm through an inner hole of the main shaft when the centrifuge operates can be met; the synchronous belt has certain effects on vibration damping and noise reducing; an additional acting force generated by imbalance of the rotating arm or vibration of a vibrating table can be absorbed to a certain degree, and the impact on a construction foundation caused by the additional acting force is reduced; the synchronous belt is reliable in work, simple in structure, and convenient to maintain and replace.

The present disclosure provides a driven height adjustable optical table or workstation and an assembly thereof for use in microscopes, optical research laboratories, and similar environments. The height-adjustable design comprises a fixed part and a movable part, the fixed part and the movable part are combined together to form a rigid height-adjustable tabletop structure, and an optical test plate or a similar platform is mounted on the worktable structure through an optional rigid passive or active vibration isolation mounting part. The height adjustment is performed by a plurality of compact actuators with associated control hardware and software and allows a user or application system to operate the table at any height.

The invention discloses a radio frequency identification (RFID) flexible bending type adjustable antenna. The RFID flexible bending type adjustable antenna comprises a first antenna, a second antenna and an antenna structure adjustment element, wherein the antenna structure adjustment element is movably connected between the first antenna and the second antenna and comprises a structure deformation module and an automatic tuning module, the structure deformation module is in communication connection with the first antenna and the second antenna separately, and the automatic tuning module is in communication connection with the structure deformation module. By the RFID flexible bending type adjustable antenna, the adaptability and the installation convenience of a single antenna in different application links can be greatly improved; the problem that a tool of a robot structure is required to be designed repeatedly is solved, and the antenna can be applicable to manual grapping of a robot; the problem that a large amount of antenna verification work is required when distance is changed is solved, and the antenna angle and combination can be directly configured by an adjustable module; and the cost problem is solved, the structure adjustment module and the automatic tuning module both belong to miniature and simple devices, a customized structural member at a large scale is prevented, and the addition of an air cylinder and a tool fixture is prevented.

The invention provides a premixing mixer and a finished product warehouse cleaning method. According to the present invention, a rotary spraying nozzle and a stretching bracket are arranged in the mixer of the used device, such that the mixer and the finished product warehouse can be automatically cleaned after the completing of the production so as to avoid the labor consumption, improve the production efficiency and save the production cost; in the method, a hair brush capable of rolling is arranged in the finished product warehouse so as to achieve the dry sweeping on the finished product warehouse, wherein the dry sweeping on the finished product warehouse can be achieved without the use of the flushing liquid so as to avoid the attaching of the finished product to the inner wall of the finished product warehouse; and in the method, the flushing waste liquid can be directly discharged from a waste liquid discharge port, and a water sucking pump is arranged in the middle of a pipeline for connecting a waste liquid outlet and a wastewater pool, such that the waste liquid discharge is accelerated so as to improve the cleaning efficiency.

The invention discloses ecological purification treatment equipment for domestic sewage. The ecological purification treatment equipment structurally comprises a main body, a cleaning box and a wateroutlet; three cleaning boxes are arranged at the top end of the main body; the water outlet is formed in the side end of the main body; the main body comprises an adjusting tank, a sedimentation tank,a disinfection tank, a water through hole, a water inlet pipe and a charging device, the charging device comprises a charging block, a foam floating block, a groove and a connecting rod, and the clamping groove charging block comprises a clamping block, a discharging groove, a clamping rod, a filter screen and an oil collecting device; the material clamping rod comprises a rod body, a material guiding block and a material guiding head; the rod body is cylindrical, the material guide block comprises a fixing hole, a mounting groove, a clamping block and a reset spring. The material clamping block is arranged to be conical, sewage can be made easier enter the charging block, the conical material guide block is arranged in the material clamping rod, so that vegetable leaves entering the material clamping block can be clamped and movably matched with the clamping block through the reset spring, the vegetable leaves can be guided to the back of the material guide block, and the vegetable leaves are prevented from being attached to the side wall of the adjusting tank.

The invention discloses a pull cover and a ring-pull can thereof. The pull cover comprises a can body, a pull cover body, rivets, a mark and a protection assembly; a concave face is formed in the outer surface of the upper end of the can body, and the mark is arranged on the outer surface of the concave face; the pull cover body is fixed to the outer surface of the upper end of the mark through the rivets; the protection assembly is arranged on the outer surface of the upper end of the can body; the protection assembly comprises a protection cover, a sealing cover, a first clamping piece and a second clamping piece; the protection cover is fixedly connected to the outer surface of the upper end of the can body; and a notch is formed in the outer surface of the upper end of the protection cover, and the sealing cover is arranged on the inner surface of the notch. According to the pull cover and the ring-pull can thereof, through the arrangement of the protection cover and the sealing cover, the concave face of the can body can be effectively sealed, when the pull cover is not opened, the sealing cover is clamped and sealed with the protection cover through the first clamping piece and the second clamping piece, and therefore the situation that a large amount of dust is attached to the concave face of the ring-pull can when the ring-pull can is placed on a goods shelf is avoided.