59results about How to "Extended years" patented technology

Multiaxis Turbine with an external upper covering, a tower structure with a plurality of vertical elongated members connected to each other with supporting horizontal elongated members, and a plurality of smaller blades on a rotation connected to a tower structure with a plurality of the rotation. A preferred embodiment includes impact impellers connected to a rotation creating a swept area with a height to diameter ratio of greater than four. A preferred embodiment includes wherein said impact impellers connected to a rotation means creating a swept area with a height to diameter ratio of greater than ten.

The invention provides a preparation method for horn vibrating reeds. The method comprises a step of mixing resin with elastic rubber material, wherein the resin and elastic rubber material are fully mixed and dispersed to form resin and rubber-material mixed slurry; an impregnation step, in which fabrics are impregnated with the resin and rubber-material mixed slurry so that the fabrics absorb the slurry; a baking step, wherein the fabrics absorbing the resin and elastic rubber material are dried via baking; a press-printing and shaping step, wherein the fabrics absorbing the resin and elastic rubber material are shaped into required shapes via hot press printing; and a shaping and cutting step, in which different vibrating reeds are separated from the fabrics after press printing. The fabrics absorb the resin and elastic rubber material via impregnation for once or for multiple times, and the horn vibrating reeds are softened via elasticity of the elastic rubber material, thereby improving ductility and anti-fatigue performance, reducing noises as well as fracturing, deformation and aging phenomena, and prolonging service life.

The invention provides a method for constructing a roof intrusion-proof protective layer. The construction method comprises the following steps that: (1) a cement cover board to be constructed and the following wall slot with a depth of ranging from 13 to 26 centimeters and a board slot are infilled with cement mortar; (2) the cement cover board is used to construct the roof protective layer with a planeness of high middle and low side and with a gradient of ranging from 3 to 6 degrees; (3) within 5 to 48 hours after the protective layer is made, a plurality of main dilatation joint lines are marked out on the upper surfaces of the cement cover board and the protective layer corresponding to a wall body, each main dilatation joint line is averaged to mark out auxiliary dilatation joint lines and then a cutting machine is used to cut V-shaped grooves with a depth of 4 to 6 centimeters along the main dilatation joint lines and the auxiliary dilatation joint lines, the width of an upper opening of the V-shaped groove is 1 centimeter; (4) the bottom of each V-shaped groove is filled with fine sand, a layer of waterproof fluid sealant with a thickness not less than one centimeter is stuck on the fine sand, and an upper edge of the V-shaped groove had better be provided with a slightly hollow part. The construction method of the invention is easy and simple to operate, good in effect, long in age limit and easy to popularize.

The invention relates to a preparation process for active dendrobium officinale freeze-dried powder freeze-dried powder. The preparation process for the active dendrobium officinale freeze-dried powder comprises the first step of dendrobium officinale dedusting and impurity removing, the second step of washing, the third step of juicing, the fourth step of filtering to obtain fresh juice and residues, the fifth step of fresh juice freezing and smashing, the sixth step of residue freezing, rough smashing and ultrafine smashing, the seventh step of full mixing of two kinds of freeze-dried powder obtained in the fifth step and the sixth step, the eighth step of filling and the ninth step of external packaging. The dendrobium officinale freeze-dried powder product obtained through the method retains original active ingredients of dendrobium officinale and can be stored and transported at normal temperature, and the service life is greatly prolonged.

The invention discloses a traditional Chinese medicinal material drying and sterilizing device, in particular to the technical field of drying and sterilizing devices. The device comprises a box bodyand placement grooves, a drying mechanism is arranged on one side of the bottom end of the box body, a moisture discharging mechanism is arranged on one side of the top end of the box body, a pressurereducing structure is arranged at the top end of the box body, sterilizing mechanisms are arranged at the top end inside the box body, the placement grooves are formed below the sterilizing mechanisms respectively, and spraying mechanisms are arranged above the placement grooves respectively. Each spraying mechanism comprises a water tank, wherein the water tank is arranged on one side of the boxbody, and a water pumping pipe penetrates through the water tank. According to the device, through the arrangement of a connecting seat, a guide pipe and a moisture removal fan, during use, moisturein the box body needs to be discharged in time after drying is completed to avoid the influence on traditional Chinese medicinal materials after drying, the moisture removal fan is started, and the moisture removal fan discharges the moisture inside the box body through the guide pipe.

The invention provides a coal mill remote monitoring system and method. The method includes collecting the operation data of the coal mill, screening and analyzing the operation data, generating a real-time operation data table, adopting a dual storage method to save the real-time operation data table, and adopting an encryption method Upload data to the cloud storage, call the data in the cloud storage and display the running status. Users can monitor multiple units with a set of monitoring terminals. At the same time, the dual storage method can avoid the loss of cloud storage data when there is no network, which affects the terminal data call. The two storage methods protect each other and improve the reliability of the system. sex.

The invention discloses a novel technology method for modeling a sandstone sculpture. A mixture is prepared from the following raw materials in parts by weight: 6 to 10 parts of resin, 35 to 50 partsof quartz sand, 60 to 80 parts of cellosilk, 70 to 90 parts of hemp thread, 150 to 250 parts of cement, 30 to 50 parts of catalyst, 20 to 50 parts of curing agent, and the balance color concentrate. The technology method for the sandstone sculpture comprises the following steps of S1, sculpturing a mud mold: blending gypsum and water into a porridge state; and S2, inverted manufacturing a mould: uniformly spraying pure gypsum prepared in S1 onto the surface of the mud mold, cutting the hemp thread and the cellosilk to the length being 1 to 2mm through a pair of scissors, uniformly blending thegypsum and water, placing the hemp thread and the cellosilk with the length being 1 to 2mm, adding a small amount of stone powder, uniformly blending, starting to attaching the blended gypsum onto the surface of the mod mold, and ensuring that the gypsum to completely cover the mud mold. The sculpture produced by the invention does not deform and is not easy to break, the service life of the product is prolonged, the production efficiency is improved, and the cost is reduced.

The invention discloses a method for realizing ecological cycle by combining planting and breeding in a sugarcane field. The method comprises the following steps: interplanting corns in the sugarcanefield at the early growth stage of sugarcane, processing fresh silage corns and sugarcane tail tips into a pig feed, and preparing biochar from withered straws; building a hog house and a chicken house beside the sugarcane field for raising pigs and chickens, wherein a cleaning waste liquid and pig urine of the hog house and the chicken house are used for drip irrigation of the sugarcane field, and excrement of the pigs and the chickens is used for raising hermetia illucens; feeding the chickens with produced hermetia illucens, after the chickens are hatched, breeding the chickens in the chicken house in a captive mode to a sugarcane elongation stage, and stocking the chickens to the sugarcane field; and preparing the hermetia illucens treated excrement and the biochar into a bio-organic fertilizer, and applying the bio-organic fertilizer to the sugarcane field so as to provide nutritional ingredients for growth of the sugarcane and the silage corns. By using of the method provided bythe invention, the sugarcane and the corns are planted; the pigs, chickens and hermetia illucens are bred; low input and high output of the sugarcane field can be achieved; and the ecological conceptof cyclic utilization is met.

The invention discloses a wide-narrow row and deep-furrow saccharum officinarum planting method with two harvested crops each year. The method comprises the following steps: a, preparing land and sowing seeds: in a period from the end of December to the middle ten days of March, performing deep scarification on saccharum officinarum planting rows, allowing breadth of the deep scarification to be 120cm, and depth to be 60cm or more, digging planting furrows with depth of 40-50cm, performing rotary tillage on the bottoms of the planting furrows, allowing the rotary tillage width to be 60cm, digging double lines, sowing the saccharum officinarum seeds, spraying water and fertilizer, performing earthing, performing compaction and covering land with a membrane, wherein the spacing between adjacent saccharum officinarum planting rows is 70-80cm, double-line width is 50cm, and the spacing between adjacent double-line groups is 140-150cm; and b, harvesting first crops: in a period from the middle ten days of May to the end of June, when saccharum officinarum seedling jointing segments are 1-2, cutting overground parts of saccharum officinarum seedlings smoothly. The planting method is suitable for saccharum officinarum planting mechanized operations, and has the advantages of being high in yield, being excellent in quality, saving time and labor, saving costs, increasing effects and the like.

The invention discloses an organic coated fertilizer for planting eriobotrya japonica and a preparation method for the organic coated fertilizer. The organic coated fertilizer is prepared from the following raw materials by weight (in parts by weight): a 4-6wt% HCl solution, zinc oxide powder, citric acid, rice hull ash, ardealite, activated carbon, bagasse, peanut shells, pomelo peels, ammonium molybdate, magnesium sulfate, potassium dihydrogen phosphate, an EM microbial agent, goat fecal pellets, lotus pond sludge, cellulose homogenate and water. The organic coated fertilizer is applicable to the planting of the eriobotrya japonica; the organic coated fertilizer gives priority to organic fermented materials, and the consumption of inorganic constituents is lowered, so that the organic coated fertilizer is beneficial to soil and is particularly applicable to fruit trees, i.e., long-term-growing plants, the content of organic matters in the soil is increased, the physiological activity of the fruit trees is promoted, the age limit of the fruit trees is prolonged, and the fruit trees are not prone to diseases and insect pests; and a proper amount of inorganic nutrients added are subjected to complexing by the citric acid, so that absorption is facilitated.

A process of manufacturing the main body of a bike helmet is disclosed, where its process comprises the following steps: (I.) coating with base layer resin: that is, uniformly coat the entire shock absorbing liner with a base layer resin; (II.) coating with protective layer resin: uniformly coat the base layer resin with a protective layer resin to form a shell; (III.) transferring pattern: transfer the pattern to print on the shell; (IV.) clear coating: spray clear coating on the pattern; by means of the aforesaid steps of the process, the shock absorbing liner and the shell are able to join tightly, which enables to solidify the helmet for better durability, to prolong the years of use, to substantially lower the production cost, and to boost the yield rate.

The invention relates to a cutter, in particular to a fodder chopper which comprises a chopper body and a chopper base. One end of the chopper body and one end of the chopper base are connected movably through a rotary shaft. The chopper base is divided into a left chopper base and a right chopper base along the direction perpendicular to the ground, clamping blocks are arranged on the sides of the left chopper base and the right chopper base opposite to the rotary shaft, threaded holes are formed in the clamping blocks, and the axes of the threaded holes in the left chopper base and the right chopper base are in the same line. By means of the structure, after cutting is conducted for a period of time, by unscrewing screws on the clamping blocks on the left chopper base and the right chopper base, the left chopper base and the right chopper base can be separated and rotate around the rotary shaft downwards so as to clean scraps on the rotary shaft, the chopper body is protected, and the service life of the chopper body is prolonged.

The invention discloses multifunctional spraying equipment for forestry operation. The multifunctional spraying equipment comprises a vertical pipe, a water conveying hose and spray head mechanisms, an extendable pipe is installed at one end of the vertical pipe, one end of the water conveying hose penetrates through the extendable pipe to communicate with the end of the water conveying pipe, a rotating disc is installed on the edge of the other end of the vertical pipe and freely rotates in the circumferential direction of the vertical pipe, and a plurality of inserting pipes are uniformly arranged at the edge part of the rotating disc. The multifunctional spraying equipment has the following beneficial effects that under the cooperative use of the rotating disc and the plurality of sprayhead mechanisms, the rotating disc is driven to rotate along with the counter-acting force of water sprayed by the spray head mechanisms, so that the 360-degree spraying work is carried out, and thespraying effect is improved; and besides, the spray head mechanisms are connected with inner pipes by being inserted into the inserting pipes and can drive the inner pipes to move along the insertingpipes, so that a connecting channel is opened or closed, the spray head mechanisms perform spraying work when the connecting channel is opened, the spray head mechanisms stop spraying when the connecting channel is closed, the structure is simple, water control can be realized by pushing and pulling the spray head mechanisms without installing a valve, the installation is convenient, and the operation is simple.

The invention discloses an ecological environment monitoring device and a monitoring method. The ecological environment monitoring device comprises a floating platform mechanism, a boat anchor mechanism and a locking mechanism, water is pumped into a water quality monitor through a water pump on the floating platform for water quality monitoring, water inlets are formed in a water conveying pipe at intervals, electronic valves are installed at the water inlets. Opening and closing of the corresponding water inlet is controlled. The device is simple in structure and flexible to operate, water sources of different depths can be extracted according to requirements for monitoring, the monitoring effect is improved, in addition, a solar panel mechanism is installed on the floating platform, solar energy is absorbed and converted into electric energy, electric energy is provided for all devices on the floating platform, energy is saved, a windward plate and a pull rod are mounted on the floating platform, and when wind blows, the solar panel can be driven to compress the telescopic rod under the action of the windward plate, the pull rod and the linkage piece, so that the height is reduced, the overall height of the device is reduced, the gravity center of the device is reduced, and the wind resistance of the device is improved.

The invention relates to the technical field of cylinder gasket sealing performance, and discloses a special cylinder gasket for an assault boat and a production process of the special cylinder gasket for the assault boat. The special cylinder gasket is characterized in that a primary processing mechanism comprises a fixed base, an air compressor is fixedly connected to one side of the top end of the fixed base, and a conveying pipeline is fixedly connected to the middle of one end of the air compressor. According to the invention, by arranging the fixed base, fixing of processing equipment is facilitated; by arranging the air compressor, generation of compressed air is facilitated; by arranging the conveying pipeline and the connecting body, transmission of the compressed air is facilitated; by arranging the first reaction cylinder, production and processing of raw materials are facilitated; by arranging the fixed plate and the supporting columns, the fixation of the motor is facilitated; by arranging the motor, the rotating shaft and the stirring fan blades, the motor can drive the rotating shaft and the stirring fan blades to rotate, so that the whole raw materials are thoroughly mixed, the processing efficiency is improved; and by arranging the heating pipe, the regulation and control of the temperature in the first-time reaction cylinder are facilitated.

The invention discloses an apparatus and a method for purifying modified asphalt waste gas through a catalytic oxidation method. The apparatus mainly comprises an atomization device, an adsorption device, an oxidant mixed-flow device, an oxidation device, a catalysis device and a fan. According to the present invention, modified asphalt waste gas is atomized by the atomization device, particulatematters are removed from the atomized modified asphalt waste gas by the adsorption device, an oxidant and the waste gas are completely mixed by the oxidant mixed-flow device, an oxidation reaction isperformed in the oxidation device, and finally the obtained material is conveyed to the catalysis device, such that the oxidant and the water perform deep oxidation on organic matters under the actionof the catalyst, wherein the clean gas is externally discharged by the fan; the particulate matters in the atomized modified asphalt waste gas are easy to capture, such that the dust removing effectis significant; the oxidant is subjected to the catalytic treatment so as to substantially improve the oxidation performance; the capture of the particulate matters prolongs the service life of the catalysis device while the generation of the secondary pollutant is substantially reduced; the investment cost and the use cost are reduced; and the increasingly stringent emission standards and regulations are met.

The invention relates to a production and breeding method of optimal soft-shelled turtles. The method comprises the stages of variety breeding, egg hatching, young turtle breeding, finished product producing and the like, the production and breeding method completely adopts a wild outdoor growing mode, and variety breeding adopts the following steps that 1, local excellent varieties of Chinese softshell turtles are selected in basins of the Yangtze River, the Yellow River, the Poyang Lake and the like which are suitable for growth of the Chinese softshell turtles, and independent breeding and cross-breeding are conducted respectively; 2, parent turtles obtained in the first step are selected to serve as optical soft-shelled turtles parents on the condition that the color and luster of the turtles are good, the activity is high, growth is moderate, neither illness nor injury appears for eight years or above, and the external shape is complete. The turtles bred through the method have unique fresh taste and quality, the meat quality, taste and dietetic invigoration effect are more excellent, continuation and improvement of the excellent varieties of the soft-shelled turtles are achieved, and the edible safety is improved.

The invention discloses a purification method and device for full-oil-quantity oil of a refueling device and belongs to the technical field of oil product filtering in the field of hydraulic pressureand lubrication. The purification device comprises a main oil tank and an auxiliary oil tank which are communicated with each other through a connection pipeline, and electric elements including a control valve, a filter, a check valve group and an oil pump which are arranged on the connection pipeline. Under the action of a controller, oil in the main oil tank is pumped out through the oil pump and passes through the control valve and the filter; when a liquid level meter monitors that all the oil flows into the auxiliary oil tank, first-time filtering is finished; then the controller is started and the oil pump is used for pumping out the oil from the auxiliary oil tank; the oil flows through the control valve and the filter and then flows back into the main oil tank to finish second-time filtering. According to the purification method and device, disclosed by the invention, the problems of dilution, sedimentation and the like in a circulating process of a traditional method are avoided; the problems that the purification efficiency of the traditional method is not high, a system is complicated and the like are effectively solved; the time of preparing a refueling task can be extremely shortened.

The invention provides ceramic tile pasting mortar and a preparation method thereof. Waste tires are used for preparing machine-made sand, the existence of black garbage is effectively reduced, and meanwhile, the modified waste tire particles have very high ductility and excellent energy absorption performance, and can effectively prevent the dry shrinkage phenomenon of the mortar in the solidification process. A binding agent is added, the binding force of the mortar to the ceramic tile is increased, meanwhile, the binding agent is alkaline, the interface on the back face of the ceramic tile can be slightly reacted, the roughness of the interface is increased, and the binding agent can adhere and cure the mortar interface more easily. A modified retarder is added, so that the coagulation speed of the mortar is slowed down, the mortar does not react with groups outside modified waste tire particles and a binder, meanwhile, the modified retarder has the effect of a plastic stabilizer, the anti-sagging property of the mortar is improved, the micro-reaction inside the mortar is stabilized, and the bonding capacity of the mortar and a matrix interface is improved.

The invention discloses a three-pole type zinc-air fuel cell, comprising a housing, an air electrode, a metal layer, a zinc material, a diaphragm layer and an electrolyte, wherein the air electrode isused as a discharge positive electrode in a chemical discharge reaction; The metal layer is used as the charging cathode in the chemical charging reaction; Zinc material is used as negative electrodefor chemical discharge with air electrode layer or chemical charge with metal layer; The electrolyte electrically connects the air electrode, the metal layer and the zinc material to each other; Thediaphragm layer can separate the air electrode, the metal layer and the zinc material from each other and supply the electrolyte through the diaphragm layer. The height of the electrolyte in the accommodation space is changed by an input or output action, so that the structure to which the electrolyte can be contacted is different, thereby changing the opening, closing, charging or discharging state of the three-pole type zinc-air fuel cell provided by the invention.

The invention discloses a device special for preventing foreign matters in an annular space of a spent fuel dry storage sealed storage tank. The device comprises a spent fuel dry transfer container, wherein a spent fuel dry-method sealed storage tank is arranged in the spent fuel dry-method transfer container, an annular cavity is formed between the spent fuel dry-method transfer container and thespent fuel dry-method sealed storage tank, a surface layer shielding pipe is arranged on the upper edge surface of the inner wall of the annular cavity, and a lead ring is arranged on the inner wallof the surface layer shielding pipe. According to the device, the surface layer shielding pipe made of wool and snakeskin materials and the lead ring composed of small lead balls are arranged, so thatcracking is not liable to occur when encountering high temperature generated by inner and outer lid friction; the wool and snakeskin materials have good high-temperature-resistant and wear-resistantcharacteristics, so that the lead balls in the surface layer shielding pipe can be protected from being damaged and exposed, the service lifetime of the annular-space foreign matter prevention deviceis greatly prolonged, and the radiation shielding effect of the annular-space foreign matter prevention device is greatly improved.

The invention discloses a volume expanding method for a seepage-proofing type wet-discharging tailings pond. On the premise of basically not adding land, a dam body and a horizontal seepage-proofing system of an existing tailings pond utilize a newly built clear water tank or an adjacent clear water tank in a newly built tailings pond as a water storage tank for draining away water and draining off floodwaters while the tailings pond which serves to the terminal stage is reversely stacked and heightened to expand volume; under the conditions of adding an overflow channel, a water drainage openchannel and the clear water tank, stacking and damping can be realized by ore drawing, so that reservoir volume can be greatly increased, especially great reservoir volume is obtained during volume expanding for some large-area tailings ponds, and therefore, service length, for a mine, of the tailings pond is prolonged, reservoir volume and investment of the newly built tailings pond are saved, great benefits are created for the mine enterprises, and land also can be saved.

The invention discloses a method for solving bump of a vehicle at the bridge head on the basis of a door type cement mixing wall. The method is characterized by comprising the following steps of: 1) piling continuous cement mixing piles on two sides of a road at two ends of a bridge abutment; 2) piling the cement mixing piles with lengths of piles gradually reducing from the bridge abutment; and 3) hermetically paving a geomembrane at the bottom of a roadbed between the continuous cement mixing piles. The method has the advantages of prolonging maintenance time limit by constructing the door type cement mixing wall, guaranteeing to control sediment within 10 cm in a heavy repair period, avoiding renovation before the heavy repair, reducing lateral deformation of the foundation, improving bearing capacity and shearing strength of soil, greatly reducing manufacturing cost compared with other methods on the basis of reducing the final settlement quantity of the foundation, not damaging the constitutive property of the foundation, and completely exerting the natural strength of the foundation.

The invention discloses a traditional Chinese medicine raw material drying and sterilizing device capable of uniformly moistening medicines, and particularly relates to the technical field of drying and sterilizing devices. The traditional Chinese medicine raw material drying and sterilizing device comprises a box body and a placing groove; a drying mechanism is arranged on one side of the bottomend of the box body; a moisture removing mechanism is arranged on one side of the top end of the box body; a pressure reducing structure is arranged at the top end of the box body; a sterilizing mechanism is arranged at the top end of the interior of the box body; the placing groove is arranged at the lower portion of the sterilizing mechanism; a spraying mechanism is arranged above the placing groove; and the spraying mechanism comprises a water tank, a flow guide pipe, a spraying pipe, an adapter pipe and a spraying hole. According to the Traditional Chinese medicine raw material drying andsterilizing device provided by the invention, through the design of the spraying pipe and the spraying hole, the flow passing through the spraying hole can form a pushing force in one direction to push the spraying pipe to rotate, so that the spraying pipe is more uniform during spraying, and the medicine moistening effect is improved.

The invention relates to a production and breeding method of optimal soft-shelled turtles. The method comprises the stages of variety breeding, egg hatching, young turtle breeding, finished product producing and the like, the production and breeding method completely adopts a wild outdoor growing mode, and variety breeding adopts the following steps that 1, local excellent varieties of Chinese softshell turtles are selected in basins of the Yangtze River, the Yellow River, the Poyang Lake and the like which are suitable for growth of the Chinese softshell turtles, and independent breeding and cross-breeding are conducted respectively; 2, parent turtles obtained in the first step are selected to serve as optical soft-shelled turtles parents on the condition that the color and luster of the turtles are good, the activity is high, growth is moderate, neither illness nor injury appears for eight years or above, and the external shape is complete. The turtles bred through the method have unique fresh taste and quality, the meat quality, taste and dietetic invigoration effect are more excellent, continuation and improvement of the excellent varieties of the soft-shelled turtles are achieved, and the edible safety is improved.

The invention relates to a highpolymer modification, water prevention and heat preservation integrated system wet pavement construction process. The process comprises the steps of: pretreatment of base layers; pavement and protection of plates; scraping of secondary waterproof paint: isolation membranes at the joined parts of highpolymer modification, water prevention and heat preservation integrated plates are torn off; waterproof bonding mortar extruded from joints is cleaned, and the secondary waterproof paint is injected in the joints by using special joint injecting equipment; pavement ofhighpolymer modification self-adhering waterproof coiled materials: the highpolymer modification self-adhering waterproof coiled materials are immediately paved on the surface of the paint after primary scraping of the secondary waterproof paint; treatment of highpolymer modification coiled material nodes: water falling port, parapet wall, gable wall and exhaust pipe nodes are treated after largesurface construction; and later inspection and protection. The construction process is simplified; the system risk is reduced; and the comprehensive energy saving effect is greatly improved.

The invention provides ultralong-persistence luminescent elastic particles applied to a sports ground and a preparation method thereof. The ultralong-persistence luminescent elastic particles appliedto the sports ground mainly comprise transparent colorless resin, transparent colorless aggregates, a long-persistence luminescent material, a liquid plasticizer, antioxidant, a vulcanizing agent anda light conversion agent. The ultralong-persistence luminescent elastic particles prepared by adopting the preparation method provided by the invention have the characteristics of high elasticity, long persistence time, high persistence strength, high permeability and the like; and even when being used in foggy days or snowy days, the normal use of a night runway processed by using the ultralong-persistence luminescent elastic particles is not influenced.

The invention provides an image scanner with an automatic paper feeding device, which comprises a casing, an upper cover and a connecting mechanism for connecting the casing and the upper cover. The connecting mechanism is provided with a first connecting device and a second connecting device. The first connecting device enables the upper cover to rotate within a first angle relative to the casing; and the second connecting device enables the upper cover to rotate within a second angle relative to the casing. According to the image scanner disclosed by the invention, by arranging the second connecting device, the upper cover can stay at any angle position within the second angle.