570results about How to "Effective blocking" patented technology

The invention discloses an environment-friendly waste gas detection device, and relates to the technical field of waste gas detection. By starting a servo motor a, a moving cylinder drives a semi-sphere to slide in a spiral stepped groove, and when the moving cylinder moves to a rotating corner of the spiral stepped groove, the moving cylinder rotates by 60 degrees, so that a circular hole is attached to an air inlet until waste gas exists in three groups of detection cavities; waste gas at different stages in the exhaust pipe can be detected through the three groups of detection cavities, and the types, concentration and emission amount of pollutants in the waste gas can be accurately known, so that targeted measures are taken in time, the pollution of the waste gas to the environment is reduced, and meanwhile, the accuracy and efficiency of waste gas detection are further improved; the movable cylinder continuously moves towards one side, so that the blocking plates on the two sides are attached, the gas inlet can be effectively blocked, and the situation that when the detector detects the waste gas, the waste gas in the exhaust pipe enters the detection cavity, and detection errors are caused is avoided.

The invention discloses an automatic stereoscopic warehouse system for pipe storage, which comprises a goods shelf and a plurality of pipes, and further comprises a plurality of groups of placing racks, two fixing plates are rotatably mounted on each of the plurality of groups of placing racks, the plurality of fixing plates are connected with the goods shelf through a rotating structure, and the rotating structure is used for driving the plurality of groups of placing racks to rotate and lift. The pipes are stored, taken and placed in a rotary mode and matched with a staggered Z-shaped placing method, the effective utilization of the storage space in a warehouse is achieved, the two ends of the pipes are effectively blocked while the pipes are stored, invasion of water and moisture can be prevented, the risk of pipe surface corrosion is reduced, the service life of the pipes is prolonged, and the production efficiency is improved. And in the pipe storage and taking-out process, self-adjusting type loading and unloading opening and closing are conducted on the storage opening, the pipe storage efficiency is greatly improved, deformation caused by external pressure or impact in the pipe storage process can be prevented, and it is ensured that the original shape and performance of the pipe are kept.

The invention discloses a pneumatic type air pipe automatic fireproof plugging device, which belongs to the technical field of building fireproof equipment, and comprises a bracket, a fireproof plugging plate, a plugging mechanism for driving the fireproof plugging plate, a fixed air pipe, a movable air pipe and a movable air pipe telescopic mechanism for driving the movable air pipe, the diameter of the fixed air pipe is larger than that of the air pipe, the diameter of the movable air pipe is larger than that of the fixed air pipe, the fixed air pipe is sleeved with the movable air pipe, and the diameter of a funnel structure at the front end of the movable air pipe is smaller than that of the air pipe; the movable air pipe front-end funnel structure and the movable air pipe front-end funnel structure are sequentially in butt joint in the wall face air pipe in the flowing direction of air pressure in the air pipe, the fireproof blocking plate can be inserted into a disconnection gap between the movable air pipe front-end funnel structure and the air pipe, the movable air pipe stretches out and draws back to achieve tight connection and disconnection of a gap with a certain width of the air pipe front-end funnel structure, and the fireproof blocking plate is inserted into the gap to separate a building hole from the air pipe. Building holes are effectively blocked, and the fire-retardant separation effect is achieved.

The invention provides an air source heat pump unit with a dust removal function, and relates to the technical field of heat pumps, the air source heat pump unit comprises a heat pump rack, a heat pump mechanism facilitating low-temperature heat transfer is arranged on the heat pump rack, and a cleaning mechanism facilitating dust removal cleaning is arranged on the heat pump rack; the heat pump mechanism comprises an air inlet and outlet pipe, a compressor, a condenser, a central control machine and an evaporator. The cleaning mechanism comprises a driving power source, a lower fixing plate, a concentric-square-shaped frame, a dust collecting box, a C-shaped rod and an ash guide pipe. According to the device, the C-shaped rod is arranged to be matched with the cleaning brush, when fins on the evaporator are cleaned, the evaporator does not need to be manually cleaned after being dismounted, the dismounting of the evaporator from shutdown and dismounting to subsequent mounting and debugging consumes more manpower and material resources, the cleaning work can be rapidly completed through the cleaning brush on the C-shaped rod, and the cleaning efficiency is improved. The downtime is shortened, the production efficiency is improved, the evaporator does not need to be disassembled, and the labor consumption is reduced.

The invention discloses a new energy storage device and belongs to the technical field of energy storage equipment, the new energy storage device comprises an isolation box, a battery box and a control box which are sequentially arranged, a partition plate is arranged in the battery box, a plurality of first lapping plates are arranged on the two sides of the partition plate, a plurality of second lapping plates are arranged on the two sides of the battery box, and the second lapping plates correspond to the first lapping plates in position; a battery module is placed on the first lapping plate and the second lapping plate, a first connecting plate is arranged at the adjoining position of the battery box and the control box, a plurality of conductive seats are arranged on the first connecting plate, the conductive seats are correspondingly connected with conductive heads of the battery module, and a battery pushing part is arranged on the outer side of each conductive seat; a second connecting plate is arranged at the adjoining position of the isolation box and the battery box, a plurality of through holes allowing the battery modules to pass through are formed in the second connecting plate, and a cooling and fire extinguishing component is arranged in the isolation box. The battery module with abnormal heating can be timely and effectively pushed into the isolation box for cooling and fire extinguishing, and the safety of other battery modules is ensured.

The invention discloses a plane and vertical combination-based Tesla valve tidal river network hydrodynamic reconstruction method, which comprises the following steps of: 1, designing a main seawater upstream channel in a tidal river network into a Tesla valve structural form on the form of a river plane; secondly, in the vertical direction of the river channel, a Tesla valve-like structure is adopted, and a directional flow guide structure is arranged at the position close to a riverbed, so that when the water flow flows towards the ocean, the flow line is smooth, and when the water flow traces upwards from the ocean to the river channel, the water flow resistance is increased; structures similar to Tesla valves are installed at the inflow and upstream positions between the ocean and the river channel, movable assemblies such as gates are not used, salty tide upstream is effectively inhibited, meanwhile, water connectivity is not blocked, the influence on fish migration and ecosystem connectivity is small, and the method is suitable for large-scale popularization and application. High-concentration salt-containing water at the bottom is more effectively blocked, and one-way flow of water and pollutant discharge in a riverway of a tidal river network area are promoted.

The invention belongs to the technical field of thickened oil development, and particularly relates to a displacement exploitation method with controllable thickened oil activity. According to the displacement mining method with the controllable heavy oil activity, firstly, fracture development condition analysis is conducted on oil reservoir crude oil reserves, then different slugs are adopted for heavy oil mining according to the fracture development condition, and a water plugging agent, a composite viscosity reducer and a CO2 synergistic huff and puff mode and a CO2 response type alkyl amidine surfactant are adopted in the different slugs; the plugging agent can generate good water channeling plugging, viscosity reduction, gas channeling plugging and other effects, has good oil displacement capacity, can greatly improve the recovery efficiency, and is suitable for heavy oil recovery under harsh conditions.

The fabricated building comprises a wall body, a mounting groove is formed in the side wall of the wall body, an inner plate is slidably connected to the inner wall of the mounting groove, a screw rod is rotatably connected to the interior of the inner plate, and a sliding plate is rotatably connected to the outer wall of the screw rod; and the two corresponding side walls of the sliding plate are each rotationally connected with a connecting plate, a locking mechanism is arranged between every two adjacent connecting plates, a first sliding groove is formed in the inner wall of the wall body, and each locking mechanism comprises a shell and is fixedly connected with the wall body in a clamped mode. According to the fabricated building used in the constructional engineering, the multiple limiting columns are clamped to the inner walls of the clamping holes, then the two locking mechanisms synchronously and mutually move by rotating the screw rods, the wall bodies can be driven to horizontally move in the process, the two wall bodies can be tightly attached together after movement is completed, the operation in the assembly process is simple, and the assembly efficiency is high. The connecting strength can be ensured, and meanwhile the assembling cost can be reduced.

The invention discloses a plugging method, device and system for an air leakage channel in a mine. The method comprises the following steps: acquiring a vertical section image of a rock stratum in a mine; based on the vertical profile images, height information of caving zones corresponding to the different types of rock stratums is determined; based on the height information and distance information between a working face of the mine and a roadway in the mine, angle information of a foam injection hole in the mine is determined, and the working face is an area where a mining operation task is being executed in the mine; a target air leakage area of the goaf in the mine is determined, and according to the angle information, the foam injection pipe extends into the target air leakage area through the foam injection hole so as to block an air leakage channel between the goaf and the external environment of the mine and an air leakage channel between the goaf and the working face, the goaf is an area where a mining operation task is executed in the mine. The technical problem that an air leakage channel in a mine cannot be effectively blocked is solved.

The invention relates to the technical field of ventilator dust removal, and discloses a spray type water film guide plate multi-stage centrifugal dust removal device and method.The device comprises a dust removal box, a surge-free dust removal centrifugal fan, a spray unit and a water film guide plate set, and the spray unit is arranged at an air inlet of the dust removal box in a sleeving mode for spray treatment; dust particles impact into the grooves of the water film guide plate group along the airflow direction under the action of inertia force and are mixed and gathered with water, and dust-water mixed liquid accelerates to flow downwards in the grooves to a flow collecting groove at the bottom of the dust removal box and is discharged under the action of gravity and dust gas velocity and parallel component of the grooves, so that the purpose of primary dust removal is achieved; and then the gas enters the centrifugal ventilator and rotates in the volute at a high speed, residual dust particles in the liquid and the gas are thrown to the inner wall of the volute main body at a high speed along the tangential direction of the airflow under the action of centrifugal inertia force and are discharged from the drainage pipes on the two sides of the outlet along the inner wall, so that the purpose of secondary dust removal is achieved, and the dust removal effect is improved.

The utility model discloses a surface cleaning device, which belongs to the technical field of cleaning equipment, and comprises a machine body and a ground brush which are pivotally connected, the ground brush is provided with a sewage suction port, the machine body is provided with a sewage barrel, the sewage barrel comprises a barrel body and a barrel cover, the barrel body is provided with a sewage inlet pipe communicated with the sewage suction port, the barrel cover is provided with an exhaust channel, and a separation part is arranged in the sewage barrel. The inner cavity of the sewage barrel is divided into a first cavity and a second cavity which are communicated by the partition part, the upper end opening of the sewage inlet pipe extends into the first cavity, an inlet of the exhaust channel is formed in the cavity wall of the second cavity, and an anti-surge plate is arranged in the first cavity and is lower than the communication position between the first cavity and the second cavity; and at least two anti-surge plates are arranged in the height direction of the sewage bucket at intervals. The surge amplitude of the dirty liquid in the first cavity is reduced step by step through the at least two anti-surge plates, the situation that the dirty liquid with the large surge amplitude directly flows into the second cavity through the communication position between the two cavities is avoided, and therefore the situation that the dirty liquid flowing into the second cavity flows towards the dirt suction fan in the machine body along with dirt suction airflow is avoided.

The invention provides a liquid flow test device and method for a double-component nozzle assembly, and solves the problem of flow characteristic measurement under the condition of simultaneous radial liquid feeding of inner and outer nozzles in the double-component nozzle assembly, the liquid flow test device comprises a test upper shell, a test lower shell, a cushion block and a blanking cap, the upper testing shell comprises a first liquid inlet pipe nozzle, a pressing block and an annular body; the lower testing shell comprises a middle sleeve, a liquid collecting ring plate, a second liquid inlet pipe nozzle and a base; the cushion block is of a concave structure and is provided with a blind hole and a radial communicating hole; the upper end of the blanking cap makes contact with the lower end of the cushion block to achieve the sealing effect, and the lower end blocks an inner cavity of the inner nozzle and is higher than the upper end face of the inner nozzle. The upper end of the double-component nozzle assembly is located in the annular body, and the lower end penetrates through the base. The pressing block is arranged at the upper end of the middle sleeve and fixedly connected with the base. The device is compact in structure, firm in fixation and convenient to assemble and disassemble, and can meet the test of nozzle assemblies with various radial apertures.

The invention relates to a quick plugging device and method for an in-well water burst dewatering well. The device comprises a grouting pipe (1), a bag (2), a grouting device (3) and a one-way flowing piece (4). The grouting pipe (1) comprises a grouting outer pipe (11) and a grouting inner pipe (12), the grouting outer pipe (11) is connected with the bag (2), a one-way flowing part (4) is arranged at the joint of the grouting outer pipe (11) and the bag (2), the grouting inner pipe (12) is connected with the grouting device (3), the grouting pipe (1) extends into a well pipe of a dewatering well (5), and the position of the bag (2) is higher than that of the grouting device (3). Compared with the prior art, the rapid plugging device for the dewatering well is provided when water bursts in the well and under the flowing water condition, cement grout can be prevented from being washed away by water flow when water bursts in the well and under the flowing water condition, and the dewatering well is effectively plugged.

The utility model relates to a convex drawing insulation slot wedge device for a motor rotor, which comprises a slot wedge main body and a convex block, and the slot wedge main body is strip-shaped; the section shape of the slot wedge main body is matched with the shape of the corresponding slot shoulder; the convex block is in a long strip shape; the shape of the section of the bump is matched with the shape of the notch of the corresponding rotor punching sheet; the bump is arranged on the outer surface of the top of the slot wedge main body; the bump and the slot wedge main body are integrally processed and manufactured; the section width of the bump is smaller than the width of the notch of the rotor punching sheet; the length of the convex drawing insulation slot wedge device of the motor rotor is cut according to the length of a notch of a corresponding rotor punching sheet. According to the utility model, risks of inter-turn, inter-phase and ground short circuit and motor burnout are reduced; the standardization degree and the universality of the slot wedge are improved; the cutting powder pollution is reduced; the probability of a groove overturning phenomenon is reduced; vibration and displacement of the coil in the groove due to electromagnetic force and in the high-speed operation process are avoided, and the performance of the motor is improved.

The utility model provides a tissue holder which is mainly composed of a setting part, a first additional circuit board, a second additional circuit board and two baffles in an integrated mode, the first additional circuit board and the second additional circuit board are vertically and oppositely connected with the setting part respectively, and a space is formed between the first additional circuit board and the second additional circuit board. The first additional circuit board penetrates through an extraction hole, the baffles are connected with the front side of the first additional circuit board and the front side of the second additional circuit board respectively, the baffles extend oppositely so as to block and position extraction type tissues or roll type tissues, a channel for the tissues to pass through is formed between the baffles, the space and the external environment are communicated, and the tissues are extracted to pass through the channel. The shortest distance of the channel between the baffles is smaller than one third of the distance between the first additional circuit board and the second additional circuit board.

The utility model relates to the technical field of hydraulic press feeding, in particular to a four-column hydraulic press feeding device which comprises a hydraulic press and a limiting device, a conveying frame is arranged on one side of the hydraulic press, a pressing plate is arranged in the hydraulic press, a movable clamping block is arranged in the hydraulic press, a discharging block is arranged on the surface of the conveying frame, and the limiting device is arranged on the conveying frame. The limiting device is arranged on the surface of the conveying frame and comprises a limiting rod and a limiting block, the limiting block is fixedly connected with the upper surface of the conveying frame, the limiting rod is slidably connected with the interior of the limiting block, and a connecting block is fixedly connected to the side face of the limiting rod. According to the discharging block limiting device, the limiting device is arranged, so that the discharging blocks are effectively limited, the effect of limiting the discharging blocks is achieved, and the situation that when equipment is used, the discharging blocks are different in moving speed and prone to being accumulated between the conveying frame and the hydraulic press, and consequently the discharging blocks are difficult to effectively move through the movable clamping blocks is reduced; the practicability of the equipment is improved.

The invention discloses a modified nano-zinc oxide plugging agent and an oil-based drilling fluid, and belongs to the technical field of oil and gas field drilling. The modified nano-zinc oxide blocking agent is a nano-scale material prepared by taking 20-40nm nano-zinc oxide, an amino-containing silane coupling agent, a polycarboxylic compound, an olefinic bond-containing primary alcohol compound, a benzene ring-containing olefin compound, an initiator and a cross-linking agent as raw materials. The particle size of the modified nano-zinc oxide ranges from 60 nm to 320 nm, nano-scale cracks in a shale stratum can be effectively blocked, the well wall is stabilized, and well collapse accidents are prevented. And the oil-based drilling fluid used in the invention has good rheological property, stability, plugging property and the like under the shale formation condition.

The utility model discloses a petroleum pipeline crack plugging device which comprises a fixing pipe, a through groove, a plugging plate, a first pressing mechanism and a second pressing mechanism. The through groove is formed in the front end of the fixing pipe, the blocking plate capable of blocking and repairing the pipeline crack is arranged in the through groove, and the first pressing mechanism and the second pressing mechanism are arranged at the upper end, the lower end and the middle end of the through groove respectively, so that pressing on the blocking plate can be achieved under mutual cooperation, and the blocking plate is tightly attached to the petroleum pipeline crack; the crack can be effectively blocked and repaired, the filling groove, the filling block and other assemblies are arranged in the blocking plate, the blocking area of the blocking plate can be adjusted according to the size of the crack under mutual cooperation, waste is avoided, and the crack blocking device is easy to use, high in flexibility and high in practicability.

The invention provides an acid-resistant nano polymer microsphere inclusion plugging system as well as a preparation method and application thereof. The plugging system is prepared from the following raw materials in parts by mass: 1-5 parts of acid-resistant nano polymer microspheres, 1-5 parts of an acid-resistant low-molecular-weight cyclodextrin polymer and 80-120 parts of water. According to the invention, a supramolecular construction thought is introduced, and an inclusion synergistic plugging system constructed by acid-resistant nano polymer microspheres and a cyclodextrin polymer through a host-guest inclusion effect is provided through design of a nano polymer microsphere surface molecular structure and a cyclodextrin polymer molecular structure. The plugging system disclosed by the invention is high in acid resistance and excellent in shear resistance, and the nano polymer microspheres have good dispersity and injectability and are easy to inject into a stratum to move to the deep part; and meanwhile, the plugging agent has the characteristics of low concentration and high efficiency, and can effectively enter the deep part of a stratum and efficiently plug cracks, so that the swept volume and the displacement efficiency of CO2 can be improved.

The invention provides a bionic temporary plugging device and a preparation method and a temporary plugging process thereof. The temporary plug comprises a wrapping layer, a filling material, a rigid temporary plugging ball, a fixing rod and a clamping ring, the wrapping layer comprises a head part and a beard part, the head part is of a hollow structure, the beard part is composed of a plurality of strip-shaped bodies, and the head part and the beard part are separated through a clamping ring; the rigid temporary plugging ball is located in the head of the wrapping layer, and the filling material comprises high-water-absorption polyacrylamide and irregular rigid particles which are alternately distributed in the head of the wrapping layer; one end of the fixing rod is connected with the rigid temporary plugging ball, and the other end penetrates through the clamping ring and is fixed by the clamping ring. The invention further provides a preparation method and a temporary plugging process of the bionic slug. The jellyfish bionic temporary plug adopts a jellyfish bionic structure, self-adaptive plugging is carried out on the eroded shot hole by utilizing the characteristics of easy deformation and large hydrodynamic radius of the jellyfish bionic structure, and the jellyfish bionic temporary plug has the characteristics of high pressure bearing and strong setting, and can adapt to perforation holes of different specifications.

The invention relates to a back passivation structure capable of reducing phosphorus internal expansion. The back passivation structure comprises an N-type crystal silicon wafer, and a tunneling oxide layer, an intrinsic amorphous silicon layer, a silicon oxynitride layer and a phosphorus-doped polycrystalline silicon layer which are sequentially arranged on the back surface of the N-type crystal silicon wafer. According to the back passivation structure capable of reducing phosphorus internal expansion, in the preparation process, P atoms can be diffused towards the silicon substrate after high-temperature crystallization, the silicon oxynitride layer serves as a first barrier layer, silicon oxynitride has higher barrier efficiency on the P atoms compared with silicon oxide, most of the P atoms can be effectively blocked, and the performance of the silicon oxynitride layer is improved. The intrinsic amorphous silicon layer serves as a second barrier layer, P atoms which are not blocked by the silicon oxynitride layer can be subjected to P doping with intrinsic amorphous silicon and are converted into doped polycrystalline silicon with low P concentration, and the tunneling oxide layer serves as the last barrier layer to further block the P atoms, so that the P atoms can be effectively prevented from being internally expanded to a crystalline silicon substrate, surface recombination is reduced, and the performance of the crystalline silicon is improved. Therefore, the cell conversion efficiency is improved.

The invention discloses a water supply device and a shower head, and the device comprises a main body which is provided with a water supply flow channel; the water path control mechanism comprises a valve rod which is arranged in the water supply flow channel and can move in the water supply flow channel in the length direction of the water supply flow channel, and a change-over switch which is arranged on the main body and is matched with the valve rod; the valve rod has a first position state for blocking the water supply flow channel and a second position state for opening the water supply flow channel; the change-over switch can drive the valve rod to reciprocate in the length direction of the water supply flow channel so as to switch the first position state and the second position state.

The utility model discloses a novel aerator for sewage treatment, which belongs to the technical field of aerators and comprises a main body, an anti-fouling mechanism is arranged at the top end of the main body, one side of the bottom end of the main body is connected with a connecting cover, the anti-fouling mechanism comprises an aeration cavity, a membrane is arranged on the top surface of the aeration cavity, an anti-fouling sheet is attached to the top surface of the membrane, and the bottom end of the main body is connected with the connecting cover. And the middle end of the bottom surface of the antifouling sheet is connected with a telescopic rod. According to the aerator, the anti-fouling sheet is attached to the membrane at the top end of the aeration cavity, so that the situation that the surface of the membrane is blocked due to sedimentation of a sewage pool after long-term use can be avoided, and during use, along with pressurization and air supply of the inflation pipe, the sealing sheet can drive the linkage rod to lift up to force the anti-fouling sheet to lift up synchronously, so that the normal aeration process is realized; the conditions of opening during aeration and closing when not in use are formed, and the blades are pressed to rotate, so that bubbles generated by accumulated water stored in the cavity are scattered, and dirt accumulation and blocking of aeration micropores by internal bubbles are effectively avoided.

The invention provides a channel switching assembly and a tracheal catheter, and relates to the technical field of medical instruments.The channel switching assembly is used for a catheter body of the tracheal catheter, the catheter body is provided with a far-end opening, a near-end opening and a side opening, and a first channel and a second channel which are isolated from each other are arranged in the catheter body; the near end of the first channel can be communicated with the near-end opening and the far end is communicated with the far-end opening, and the near end of the second channel can be communicated with the near-end opening and the far end is communicated with the side opening; the channel switching assembly comprises a blocking piece which is movably arranged on the tube body and used for blocking the first channel or the second channel so that one of the first channel and the second channel can be disconnected from the near-end opening, and the other one of the first channel and the second channel can be communicated with the near-end opening. The channel switching assembly further comprises a sealing piece, the sealing piece is arranged on the plugging piece, and the sealing piece is used for being matched with the plugging piece to disconnect the first channel from the near-end opening under the condition that the insertion part is located in the first channel. The tracheal catheter has the advantage that the operation steps during plugging control of the tracheal catheter are simplified.

The invention discloses automatic heat treatment equipment for a glass substrate, and relates to the technical field of glass processing equipment.The automatic heat treatment equipment comprises a hot bending die, the hot bending die comprises a fixed die and a movable die which can be opened and closed, the fixed die comprises a die holder, and a die cavity with an arc-shaped vertical section is formed in the die holder; the air cavity is formed in the die holder, a plurality of air blowing holes communicated with the air cavity are distributed in the bottom surface of the die cavity, and a valve groove is formed in the middle of each air blowing hole in a cut-off mode; the valve plate is arranged in the valve groove and can slide along the inner wall of the valve groove in an airtight mode, and communicating holes corresponding to the blowing holes in a one-to-one mode are formed in the valve plate. Compared with an ejector rod mode, formed glass is more softly and progressively jacked, air pressure thrust is evenly distributed at the bottom of the formed glass, the formed glass is gradually separated from a mold cavity, the product quality problem caused by mold taking is reduced, and the product percent of pass is increased.

The invention provides a cement-based permeable crystallization type waterproof coating which comprises the following components in percentage by weight: 45-60% of cement polymer powder, 2.5-5% of silicic acid powder, 1-2% of a complexing agent, 2-4% of an auxiliary agent, 5-10% of carbohydrate and 20-30% of water, the cement polymer powder comprises Portland cement powder and sulphoaluminate cement powder, the silicic acid powder comprises fluorine silicon crystal acid, silica fume, talcum powder and quartz particles, the complexing agent comprises butyl acrylate or polyacrylate, the auxiliaries comprise high-toughness resin, stearic acid or aluminum stearate and polyester acid vinyl ester or polyester acid vinyl adhesive, and the carbohydrate comprises starch. According to the invention, outside water and other harmful media are prevented from invading the concrete, water-insoluble branch and tendril-shaped crystals are generated in the concrete, pores and micro-cracks in the concrete are sealed, and a rigidity and softness combined process is adopted, so that the invasion of the outside water is effectively blocked, and the effects of water blocking and water prevention are achieved.

The present invention discloses a photovoltaic power generation device with a protective structure, including a driving base, a solar panel fixedly mounted on the driving end of the driving base, a support frame fixedly mounted on one side of the driving base, storage rods extending longitudinally fixedly connected at both ends of the support frame, a plurality of blocking ropes arranged at intervals and parallel to each other connected between the two storage rods, and the blocking ropes are located directly above the solar panel. The photovoltaic power generation device of the present invention can protect the solar panel by arranging a blocking rope above the solar panel, preventing debris from falling onto the solar panel, thereby increasing the service life of the solar panel and the efficiency of absorbing solar energy.

The invention belongs to the field of medical instruments, and particularly relates to a PFO plugging device based on a 4D printing technology and a preparation method of the PFO plugging device. The PFO plugging device comprises a main body structure. The main body structure is integrally formed in a 4D printing mode. The main body structure comprises a plurality of special-shaped ligaments, the ends of the ligaments intersect on the axis of the main body structure, and all the ligaments are arranged around the axis of the main body structure in an annular array mode. The preparation method comprises the steps of preparation of raw materials, modeling design of the PFO plugging device, 4D printing forming and connection of a main body structure and the flow blocking film. The main body structure is integrally formed through the 4D printing technology, the main body structure is high in supporting force and clamps a primary septum and a secondary septum, effective plugging is formed, the PFO plugging device can be individually formed through 4D printing according to the actual situation of a patient, the size matching degree of the PFO plugging device and the size of an affected part is high, and postoperative effective plugging is good; the stable shape of the clamped tissue is guaranteed, and the problems of tissue abrasion and long-term tissue perforation are solved while the device complies with heart movement and atrial septum swing.

The utility model relates to a heat dissipation device of a motor driver, and aims to solve the problems that in the working process of the existing motor driver, a large amount of heat is generated in the driver, and when the heat generated by the driver cannot be discharged out of the driver at the first time, the temperature in the driver rises continuously, so that the heat dissipation effect is poor. The utility model relates to a direct-current motor driver, in particular to a direct-current motor driver, and aims to solve the technical problems that components in the driver work abnormally due to continuously increased temperature, so that a circuit in the driver is influenced, the driver cannot work normally, and finally the operation of the direct-current motor is influenced, and the direct-current motor driver comprises a motor driver body. The semiconductor chilling plate is arranged on the radiating fin, so that airflow passing through the semiconductor chilling plate is effectively cooled, when the cooled airflow is in contact with the radiating fin, heat exchange can be better carried out, the wavy radiating fin increases the contact area with heat and improves the radiating efficiency, meanwhile, the wavy radiating fin can slow down the airflow rate, and the low-temperature airflow and the radiating fin are subjected to sufficient heat exchange.