44results about How to "Prevent secondary" patented technology

The invention discloses an impact test device. The impact test device comprises a protecting-limiting device, wherein the protecting-limiting device is arranged outside a test piece and comprises a protecting framework and a limiting device, the protecting framework is formed by welding steel rods, and the limiting device is fixed in the protecting framework; and the limiting device comprises a first memory metal, a second memory metal, a third memory metal and a fourth memory metal which are sequentially fixedly connected, electromagnets are arranged at joints among the four memory metals. The safety of a test operator can be protected by virtue of the protecting device, and the falling position of a drop hammer can be effectively controlled by virtue of the limiting device, so that the secondary or repeated impact caused by the drop hammer to the test piece is avoided, and the accuracy of the test is increased; and furthermore, by virtue of a specific rest function of the memory metals, the damage caused by the impact force of the drop hammer to the protecting device can be reduced, the uncertainty in the test can be reduced, and the test precision is increased.

The invention relates to the technical field of medical instruments, in particular to a stent graft used for treating peripheral arterial diseases and provided with a branch stent. The stent graft comprises a main stent and the branch stent, the main stent and the branch stent are each provided with a near end, a far end and an inner cavity arranged between the near end and the far end, an opening is formed in the main stent, the main stent and the branch stent are connected through a connector, the connector is provided with a bottom connected with the opening, a top capable of movably entering and exiting the opening and a connection inner cavity arranged between the bottom and the top, and the near end of the branch stent is connected with the top of the connector. The stent graft has the advantages that the stent graft is used for treating vascular diseases, is wide in adaptability, does not need to be customized, can be used for recovering multiple branch arteries when the peripheral arterial diseases are treated, prevents vascular stents from being implanted twice or many times and simplifies operation difficulty.

The invention discloses a vertical impact tester which comprises a base frame module, an impact body module, a quick clamp module and at least one inertia triggering module .The base frame module forms a base framework of the vertical impact tester, and at least two guide shafts are longitudinally and vertically arranged in the base frame module .The impact body module comprises a movable carrier plate and a punch installed at the lower end of the movable carrier plate, and the movable carrier plate is connected with the guide shafts through linear bearings .The quick clamp module is installed on a bottom plate on the lower portion of the base frame module, opposite to the punch and used for holding an elastic workpiece to be subjected to impact testing .The inertia triggering modules are installed on the movable carrier plate .The impact body module impacts the elastic workpiece, rebounds and then triggers a locking action, and the impact body module is locked to the base frame module so as to prevent the impact body module from repeatedly colliding with the elastic workpiece .According to the technical scheme, modular design is adopted, the impacting action can be automatically locked after impact testing so as to prevent the elastic workpiece from being impacted twice or many times, and accuracy of testing is guaranteed.

The invention discloses a bar code detecting device. The bar code detecting device comprises a multi-side camera module used for detecting the bar code on a package in all directions. The multi-side camera module comprises a plurality of linear array cameras and a plurality of area array cameras. A plurality of linear array cameras are angularly arranged on the vertical plane of the movement direction of the package, and a plurality of area array cameras are angularly arranged on the parallel plane of the movement direction of the package. By means of the above technical scheme of the invention, by arranging a plurality of line array cameras at an angle on a vertical plane of a movement direction of the package, and a plurality of area array cameras are arranged at an angle on the parallelplane of the movement direction of the package, so that the omni-directional code scanning can be completed in the package transportation process, the secondary code scanning is avoided or the code scanning is omitted, and the effect of high efficiency, convenience and manpower saving is achieved.

The present invention discloses a copper slag-fly ash geopolymer, a preparation method thereof, and use thereof, belongs to the technical field of geopolymer. The preparation method of copper-fly ash geopolymer provided by the application comprises the steps of: mixing the copper slag, fly ash and alkali activator solution, obtaining a slurry; proceeding polymerization to the slurry, obtaining a copper slag-fly ash geopolymer. The fly ash and copper slag are used as raw materials in the application, which greatly improve the utilization rate of the industrial waste residue. The advantages line in that no need for additional addition of inorganic reinforcing filler, low production cost, simple operation and competency for industrial production. Moreover, the copper slag-fly ash geopolymer has good compressive strength, and can solidify the heavy metal ions in copper slag at the same time, thus reducing the environmental pollution.

The invention relates to an all-directional code scanning sorter capable of inducing arrival of express items in the express transportation process to put on a lower side transparent plate; a support arm inner motor controls a lead screw to adjust the lower side transparent clamping plate to ascend and displace and an upper side transparent clamping plate to descend and displace so as to realize clamping of the express items; a back transparent clamping plate moves to a code scanning frame; and a steering engine controls the support arm to rotate to help code scanning so as to realize all-directional code scanning, so that the secondary or multiple scanning is prevented, the efficiency and the convenience are achieved, and the manpower is saved.

The invention discloses a preparation method of hand-sticking-free paper and a product thereof. The kitchen paper has a sheet-shaped structure and consists of an upper layer and a lower layer, whereinone layer is a surface with water absorption and oil absorption functions, and the other layer is a surface with water and oil prevention functions, the method comprises the processes of processing pulp, preforming size mixing, embossing and pressing, punching formed paper, rolling the paper, cutting the paper, sterilizing and packaging the paper. The hand pollution problem caused by the wettingof the kitchen paper by water or oil is solved, the secondary or multiple wiping caused by the wetting of the kitchen paper is avoided in the cleaning process, and the use experience is greatly optimized. A new process is not added, and the method has the advantages of simple production process, no environmental pollution, continuous large-scale industrial production and the like.

The invention provides a water injection well long-acting augmented injection acid technology. Through a mode of combining local pressure lifting with acidification, the problem of low pressure injection or no injection is solved, and purposes of comprehensive treatment and increasing the amount of injected water are achieved. The method does not need to take off a pipe string and flowback well washing is not required. II type chelating acid has strong chelating property, in the acid-rock reaction process, Ca<2+>, Mg<2+>, Fe<3+> and other metal ions can be chelated to avoid secondary or tertiary precipitation generation, the rust inhibition (less than 3.0g/(m<2>.h)) is low at the same time, and the pipe string in a wellbore cannot be corroded to bring downhole accident.

The invention provides a support domain fast construction method of direct current resistivity element-free method simulation. The method includes the following steps: determining distribution information such as media, landforms and electrodes of a two-dimensional geoelectric model, establishing a calculating domain of a direct current resistivity element-free method, and utilizing an irregular node discrete geoelectric model; arranging and numbering all nodes from small to large according to the x coordinate of the nodes and the z coordinate to give initial support domain parameters; takingthe center point of a background unit as a center, constructing a first class local support domain according to the parameters, dividing the background unit into four sub-domains in the support domain, taking the center points of the sub-domains as centers, constructing second class support domains, and selecting Ng nodes which are close to a Gauss point as the support domain for each Gauss pointin the sub-domains; and performing element-free method calculation to obtain observation apparent resistivity parameters. The method can distribute discrete models based on any nodes so that the support domains can be rapidly constructed, and therefore, calculating efficiency of conventional direct current resistivity element-free method forward modeling can be enhanced.

The invention discloses an air purification spraying device for a printing and dyeing room, and belongs to the technical field of air purification. The device comprises a main body box and suction pumps arranged in the left side and the right side of the main body box and used for pumping a water source into the main body box for circulation and then discharging. The device overcomes the defects in the prior art, multiple sprayers can be installed at the upper end of a water pipe by screwing connectors into the water pipe one by one through sprayers, an adjusting ring, nozzles and the connectors, the spraying direction of the device is effectively increased, and after the adjusting ring moves up and down, the impact force generated when water flow collides with the adjusting ring can be adjusted; water flow can be extruded out of the nozzles at different injection speeds according to the magnitude of impact force to be sprayed, then the spraying range of the device is changed, and the device can conduct wide-range spraying or fixed-point spraying on part of areas with serious air quality according to the actual air conditions of different areas in the printing and dyeing room, resources are saved, and the working efficiency is improved.

The invention provides an acidizing solution for dissolution of a clay mineral and a preparation method thereof. The acidizing solution comprises hydrochloric acid, fluoboric acid, acetic acid, trifluoroacetic acid, hydrogen peroxide, ammonium chloride, dimethylamino-methylbenzotriazole, alkyl ammonium chloride, and polymethylacrylic acid. The acidizing solution provided by the invention can effectively dissolve organic matter, such as clay minerals and cements, in a high-temperature oil-gas reservoir over 160° C., inhibit swelling and migration of clay particles in the presence of water in the acidizing process, avoid secondary deposition of the reservoir, and improve the permeability of the reservoir. The acidizing solution can be prepared and used on the field conveniently and is safe and reliable.

The invention provides a terminal box with multiple types of interfaces integrated on one face plate. According to the connection method, due to the fact that the problem that different terminal boxes are installed for the second time or repeatedly installed due to development of the network technology is solved, construction cost is reduced, indoor wiring is standardized, indoor terminal boxes are reduced, cable connection is made to be more reliable, and installation, use and maintenance are all quite convenient to conduct. Dedicated composite cables or split cables enter the multi-purpose terminal box through cable input and output holes, if the dedicated composite cables are adopted, cable bodies in each composite cable are stripped, sleeved with dedicated protective sleeves and fixed with pressing plates, and then the stripped cable bodies are connected with corresponding terminals behind the face plate. If the split cables are adopted, the cable bodies in the split cables are directly connected with the corresponding terminals behind the face plate, and then the face plate covers a base and fixed to the base through screws.

The invention discloses a highway pavement tamping device, which includes a vehicle body that comprises a supporting plate and a moving part, and the moving part comprises rolling wheels arranged at the front bottom end and the rear bottom end of the supporting plate; a stirring mechanism is arranged on the supporting plate; a repairing device comprises a drill bit part, a tamping part and an auxiliary rolling part, which are arranged at the bottom end of the supporting plate; an auxiliary rolling part is arranged at the rear end of the tamping part in a rotatable and telescopic manner; a controller; a repairing positioning module which is used for positioning the drill bit relative to the to-be-repaired surface; a repairing shape determining module which is used for scanning and analyzingthe size and repairing depth of the to-be-repaired surface so as to generate a travel path of the drill bit; and the filling analysis module is used for receiving the size and the depth of the repaired area analyzed by the repairing confirmation module so as to generate the amount of the repairing material used for filling the repaired surface in the compacted state. The device integrates stirring, conveying and tamping, the repairing efficiency is high, and the compaction effect is good.

The invention belongs to the technical field of highway facilities, and in particular relates to a highway safety guardrail. The highway safety guardrail comprises protective rails, protective columns, connecting bands, folding safety fences, connecting locks and a roadbed, wherein the protective columns are anchored to the roadbed; the protective rails are fixed to the upper ends of the protective columns; one end of each connecting band is connected to the corresponding protective rail and the other end of each connecting band is connected to the corresponding folding safety fence; and two safety fences of each folding safety fence are locked by the corresponding connecting lock. When a vehicle driving at high speed hits the highway safety guardrail, the high plasticity of the connectingbands can reduce a certain impact force, and the folding safety fences are completely unfolded and locked by the connecting locks so as to prevent the vehicle from going off the road. In the impact process, the deformation of the connecting bands and the unfolding of the folding safety fences have a cushioning effect on the vehicle and provide road space to form a temporary emergency lane so as to prevent second or more impact by following vehicles.

The invention discloses an air curtain type nursing bed and an ambulance with the same. A plurality of air outlet holes are distributed in the circumferential direction of a bed table of the nursing bed, an air supply device used for supplying air to the air outlet holes is installed on the nursing bed, a negative pressure air collecting device is arranged above the bed table and used for absorbing airflow from the air outlet holes, and the airflow forms an air curtain along the circumferential direction of the bed table. The ambulance comprises an air curtain type nursing bed, a movable framewith wheels is installed on the lower side of the bed table, sliding ways matched with the wheels are arranged in the ambulance, and the negative pressure air collecting device is installed on the top wall of the ambulance. The air curtain type nursing bed has the beneficial effects that the air curtain structure formed by airflow can guarantee communication between doctors and patients and can also play a role in physical isolation, so that medical staff are prevented from being infected.

The invention discloses a mechanical replacement type mine explosion door. The mechanical replacement type mine explosion door comprises an explosion venting opening and a cover plate explosion door at the top of the explosion venting opening. The cover plate explosion door and the explosion venting opening incline. A groove gear is connected to the right side of the cover plate explosion door ina clamped manner. The front face of the groove gear is coaxially connected with a transmission gear. The left side of the transmission gear is engaged with a gear set. The left side of the gear set isengaged with a first gear. The left side of the first gear is engaged with a second gear. A roller is arranged on the left side of the first gear. According to the mechanical replacement type mine explosion door, the explosion venting opening is designed to become wider gradually from bottom to top, the situation that impact waves generated by exploding enter a fan opening is avoided to a certaindegree, a fan is prevented from being destroyed, and fan safety is protected; and the explosion venting opening changing from narrow to wide has a certain weakening function to impact waves, the explosion venting opening with the inclined notch-shaped top can weaken the impact waves secondarily, the impact wave power is reduced, the cover plate explosion door is protected and is prevented from being suffering from impacting deformation, and when the cover plate explosion door does not suffer from deformation caused by impacting, the cover plate explosion door can be cyclically utilized.

The invention discloses a preparation method of a foliar magnesium fertilizer with high adhesive force and pH sensitivity, and relates to the technical field of foliar fertilizer. The preparation method comprises the following steps of: mixing nano SiO2 spheres serving as a template with magnesium salt, ammonia water and ammonium chloride, carrying out hydrothermal reaction by a one-pot boiling method, and washing and drying a product obtained by the reaction to obtain the foliar magnesium fertilizer which is similar to a ping-pong chrysanthemum shape and has wrinkles on the surface. The invention also provides the foliar magnesium fertilizer prepared by the method. The method disclosed by the invention has the beneficial effects that the fertilizer prepared from the nano SiO2 serving as a chemical template and an ammonia solution containing magnesium salt under a low-temperature hydrothermal condition has sensitivity to the pH value, the release amount of the magnesium element of the foliar magnesium fertilizer can be controlled by adjusting the pH value of the solution in the foliar fertilizer spraying process, and therefore, the requirements of different crops for the magnesium element and the requirements of the same crop for the magnesium element in different growth periods are met.