51results about How to "Avoid hole plugging" patented technology

The invention provides a carbon aerogel/metal organic framework composite material, a preparation method and application thereof in gas storage, and belongs to the technical field of high polymer materials and gas storage. The composite material is composed of an MOFs material with good adsorption capacity and a carbon aerogel framework material, wherein the MOFs material is used as an object material to be directly assembled into an aerogel framework, a blocky composite adsorbent material without a binder is obtained after joint carbonization, and methane gas can be effectively adsorbed and stored, therefore, the carbon aerogel/metal organic framework composite material has good practical application value.

The invention discloses an evaporation crucible. The evaporation crucible comprises a crucible body, a crucible cover and a heating assembly. The crucible body is used for storing an evaporation material and covered with the crucible cover; the crucible cover is provided with a plurality of spray holes which are used for making vaporized evaporation material molecules fly off; and the heating assembly is arranged on the crucible cover, does not cover the spray holes and heats the crucible cover independently. The invention further discloses an evaporation method of the evaporation crucible. By means of the evaporation crucible and the evaporation method thereof, in the evaporation process and the evaporation finishing process, the temperature of the crucible cover is always kept at the material vaporization temperature, and the temperature of the whole crucible cover is uniform, so that the vaporized material molecules are not solidified at the spray holes when passing through the spray holes, and accordingly, the phenomenon of hole blocking is avoided.

The invention discloses a novel dynamic separation sieve which comprises a rack, a sieve barrel arranged on the rack and a motor arranged on the rack. A sieve net which is tightened through a sieve net compression mechanism is arranged on the inner wall of the sieve barrel. The sieve barrel comprises a sieve barrel spindle connected to the rack through a supporting bearing and a sieve barrel housing arranged on the sieve barrel spindle. The sieve barrel spindle is an eccentric shaft, the sieve barrel housing is arranged on the sieve barrel spindle through a sieve barrel rotating shaft capable of achieving self-aligning, and a conveyor belt is connected between a driving wheel of the motor and a transmission wheel fixed to one end of the sieve barrel spindle. According to the novel dynamic separation sieve, the eccentric shaft is adopted as the sieve barrel spindle, the sieve barrel makes vibration motion on the rack to prevent materials which are similar to sieve net holes in boundary dimension from being blocked on the sieve net or prevent fine powder from being attached to sieve net wires, the phenomenon of hole blockage is avoided, and a high separation effect is achieved; strong springs are used for fixing the sieve barrel, and the working state that the sieve barrel vibrates instead of rotating is achieved. The equipment does not wholly rotate, so that normal operation of other equipment near the sieve is not affected.

The invention relates to modified clay double-fluid grout. The modified clay double-fluid grout is formed by adding an adjuvant into modified clay grout and mixing, wherein the adjuvant is sodium silicate of which the baume degree is 39 degrees-42 degrees and the modified clay grout comprises the following components in parts by weight: 1 part of cement, 1 part of clay and 2 parts of water, wherein the addition of sodium silicate accounts for 10%-40% of volume of the modified clay grout; or 1 part of cement, 1 part of clay and 1.6 parts of water, wherein the addition of cement accounts for 10%-30% of volume of the modified clay grout. The invention also provides a grout-making and grouting process of the modified clay double-fluid grout.

The invention discloses a hydraulic cutting nozzle with a residue filer device, and relates to the technology that high-pressure water jet is adopted for cutting in a coal bed, which solves the problem that the existing hydraulic cutting nozzle without the function of filtering residues is easy to block a hole so as to cause the failed construction of cutting. The invention comprises a punching nozzle positioned on a tip of a shell, and a cutting nozzle positioned on the side of the shell, and is characterized in that: the external part of the shell is provided with a two-segment filter tooththe front part of which is hinged, the front end of the two-segment filter tooth is hinged on the front end of the shell, the back end of the two-segment filter tooth is hinged with a reset spring arranged on the external part of the shell, a position of the two-segment filter tooth after folding, is provided with a disposable plastic hoop, the inner cavity of the shell is provided with a movablecore which is matched with the inner cavity in a sliding way, the front end of the movable core is provided with a positioning convex shoulder which can slide in the front cavity of the shell, and the back end of the movable core is in a spherical surface contacted with steel ball. The invention is beneficial to the popularization and application of the high-pressure water jet cutting technology in the coal-mine gas drainage under suction.

The invention provides a preparation method of a halogen-free flame-retardant polyacrylonitrile fiber. The method mainly comprises the following steps: heating and melting a halogen-free flame retardant containing phosphorus and nitrogen, then stirring and blending with a polyacrylonitrile spinning solution, carrying out wet spinning, and then carrying out cross-linking hydrolysis to obtain the flame-retardant polyacrylonitrile fiber. According to the preparation method disclosed by the invention, the halogen-free organic phosphorus-nitrogen flame retardant can be uniformly and stably dispersed in the spinning solution, so that a hole blocking phenomenon is effectively avoided during spinning, and the period of replacing a nozzle during spinning is greatly prolonged. Meanwhile, chemical modification of crosslinking and alkaline hydrolysis is further carried out on the surface of the fiber after a hot drafting procedure in a spinning process of the flame-retardant acrylic fiber, the flame retardance LOI of the prepared acrylic fiber is larger than or equal to 26%, and the hygroscopicity of the acrylic fiber is improved.

The invention discloses a subdivision suction bucket-shaped foundation for preventing hole blocking by soil plug and reverse grouting. The subdivision suction bucket-shaped foundation comprises a suction bucket and water pumping installation equipment. The suction bucket comprises a suction bucket top plate, an outer bucket wall, an inner bucket wall and compartment rib plates, wherein the suctionbucket top plate, the outer bucket wall, the inner bucket wall and the compartment rib plates are fixedly connected, and the inner bucket wall and the compartment rib plates divide the suction bucketinto an inner side compartment and a plurality of outer side compartments. The subdivision suction bucket-shaped foundation further comprises a soil plug baffle, a soil plug detection device, a waterthrough hole and a geotextile filter screen. A filter screen is arranged in the foundation, and the hole blocking phenomenon possibly occurring in the injection process is prevented. The soil plug baffle and the detection device are arranged in the foundation, whether the height of the soil plug in the bucket exceeds the limit or not can be monitored in real time, and when the whole height of thesoil plug reaches the soil plug baffle, constructors can stop further suction injection according to monitoring data and then perform reverse grouting to fill gaps. Slurry injected into the bucket can ensure that a top cover of the suction bucket is in complete contact with the soil body, so that the installation quality of the suction bucket is improved, and the bearing capacity of the suction bucket and the safety of the bucket top plate structure are further ensured.

The invention discloses continuous aluminum oxide feeding equipment which comprises a material box, a feeding air cylinder, a fixed container, a crust breaking head, a material passing frame, an oblique plate, a buffer and a feeding pipe. The feeding pipe is led to the bottom of the crust breaking head. The continuous aluminum oxide feeding equipment further comprises an air pipe which is arranged at a buffer outlet and used for blowing air to the buffer outlet. Compared with the prior art, the continuous aluminum oxide feeding equipment has the beneficial effects that (1) aluminum oxide is made to enter an electrolyte slowly, and the temperature fluctuation of an electrolytic cell and the concentration fluctuation of the aluminum oxide are reduced, so that the current efficiency is improved, and energy consumption is reduced; (2) the aluminum oxide is made to have enough time to be melted into the electrolyte, so that sediment at the furnace bottom is reduced, the pressure drop at the furnace bottom is reduced, and energy consumption is reduced; (3) the aluminum oxide is made to enter the electrolyte slowly through a pipeline, and the crust breaking head is prevented from being impacted so that the aluminum oxide can be prevented from being dispersed, the actual amount of materials entering the electrolytic cell is increased, and the effect coefficient is decreased; and (4) large particles in the aluminum oxide are blown away through the gas reverse blowing principle, so that blockage is eliminated, and the hole blockage phenomenon can be effectively prevented.

The invention discloses a machining method for drilling of a backboard of a PCB. During first time of drilling, drilling is conducted through a mode combining two micro drill bits of a long chip discharging groove UC-shaped (a long blade drill pin) micro drill bit and a short chip discharging groove ST-shaped (a short blade drill pin) micro drill bit; firstly, pre-drilling is conducted through the short chip discharging groove ST-shaped micro drill bit, the depth of a hole is 10-30% of the thickness of the board, and then the long chip discharging groove UC-shaped micro drill bit is used for drilling; during long chip discharging groove drilling, a mode of multi-step drilling is adopted, and if the depth the to-be-drilled hole is d, drilling is conduced according to the proportion of 1/d:2/d:3/d:4/d for each step in sequence; and during back drill drilling, a drill pin with the drill pit angle being 150-170 degrees is selected, a one-side copper-clad board is adopted, and the copper side is placed downwards and makes contact with the PCB. Compared with the prior art, a traditional back drill drilling mode adopting positive and negative drilling and using a traditional aluminum board to serve as a cover board is changed, drilling efficiency is effectively improved, positioning precision is good, and problems that machining, flashing, hole plugging, pin breaking and the like of back drill drilling are effectively solved.

The invention discloses an aluminum sol production process and aluminum sol produced by the process, and the process comprises the following steps: carrying out first contact on an aluminum source and a first alkali source to obtain a first reaction solution with the pH value of 3-5, then carrying out first heating aging, carrying out second contact on the solution subjected to the first heating aging and a second alkali source to obtain a second reaction solution with the pH value of 3-4.5, then carrying out secondary heating aging, and carrying out common electrodialysis on the obtained salt-containing aluminum sol to obtain aluminum sol and recovered salt; and allowing the recovered salt to be subjected to bipolar membrane electrodialysis to respectively obtain a product acid and recovered alkali, and circularly using at least part of the recovered alkali in the step (1) and/or the step (2); The primary heating aging and the secondary heating aging are carried out at the temperature of not more than 100 DEG C. The production process provided by the invention has the advantages of low production cost, mild conditions in the whole production process, basically no waste emission, and good quality of the prepared alumina sol product.

The invention discloses a preparation method of a white oil sizing agent of composite graphene. The preparation method comprises the following steps: 1) adding a component A and a component B into white oil, heating the mixture with stirring till the component A and the component B are fully dissolved to form a uniform solution, and naturally cooling the solution to room temperature, wherein the component A is an antioxidant, and the component B is a dispersing agent and/or a modifying agent; 2) stirring graphene powder at a high speed andat room temperature, adding the graphene powder into the solution prepared in the step 1), and continuously stirring till a uniformly-dispersed graphene/white oil sizing agent is formed.

The invention relates to a treatment method of silicon powder for molten silicon infiltration. The treatment method can be used for preparing reactive sintering silicon carbide, a carbon fiber reinforced silicon carbide-based composite material and a silicon carbide fiber reinforced silicon carbide-based composite material. Traditional reactive siliconizing mostly adopts silicon powder as a siliconizing raw material, and the problems of hole blockage or non-uniform infiltration and the like are easy to occur in the siliconizing process. According to the invention, the silicon powder is pretreated, so a thin shell is formed on the surface of the silicon powder, and the silicon can be broken and quickly enter a porous body by utilizing the volume change effect of the silicon powder in melting and heating processes; and thus, the problems of hole blockage and the like in reaction are avoided, and infiltration efficiency is favorably improved.

The invention discloses a vibrating screen for wet sieving. The vibrating screen comprises a plurality of layers of screen cloths, a distributor and a material outlet, wherein the screen cloths are sequentially and vertically arranged; the distributor is arranged above the first layer of screen cloth; a stirring device is arranged above the distributor; the material outlet is arranged below the last layer of screen cloth; at least one layer of screen cloth in the screen cloths is provided with a flushing device in parallel; the flushing device is connected with a flushing pipeline; and flushing sprayers are arranged on the flushing device. The phenomenon that meshes of a vibrating screen are prone to being blocked in the use process can be avoided, the solid-liquid ratio of filtered powder is increased, and the production efficiency of the powder is improved.

The invention relates to a device for detecting the blockage of an automobile connector pin hole. The device includes a fixed plate, a clamping groove is formed on the fixed plate, a pin fixing insertis embedded in the clamping groove, a pin for detection is arranged on the pin fixing insert, when the device is used, the pin for detection is inserted into a to-be-detected automobile connector pinhole, if the pin for detection can be inserted into the to-be-detected automobile connector, the to-be-detected automobile connector pin hole is not blocked, and if the pin for detection cannot be inserted into the to-be-detected automobile connector , the to-be-detected automobile connector pin hole is blocked. Compared with the prior art, the device is simple in structure, convenient to use andhigh in detection efficiency, outflow of defective products is effectively controlled, and the phenomenon of detecting whether a broken pin blocks the hole in a product only through visual inspectionis avoided. The device is convenient to operate, if a product cannot be inserted smoothly, a hole blockage phenomenon of the product can be found immediately, a defective product can be found, and outflow of the defective product is effectively avoided.

The invention relates to a rear-mounted double-channel abrasive jet slotting device, and belongs to the field of coal seam pressure relief and permeability improvement. The rear-mounted double-channel abrasive jet slotting device mainly comprises an ultrahigh-pressure clean water pump, an ultrahigh-pressure hose, an ultrahigh-pressure rotary water tail, an abrasive pumping device, an abrasive rotary sealing water tail, a double-channel sealing drill rod and a double-channel slotting device. The ultrahigh-pressure clean water pump provides a jet flow power source, and the ultrahigh-pressure hose, the ultrahigh-pressure rotary water tail and the double-channel sealing drill rod ensure safe transmission of high-pressure water. The abrasive pumping device, the abrasive rotary sealing water tail, the double-channel sealing drill rod and the double-channel slotting device form an abrasive sand adding channel, and double-channel supply of high-pressure water transmission and abrasive transmission separation is achieved. According to the rear-mounted double-channel abrasive jet slotting device, the double-channel abrasive jet slotting device is innovatively invented, and abrasion to a high-pressure hose and a drilling tool in the abrasive and high-pressure water mixed conveying process is avoided. Meanwhile, the on-way pressure loss of the high-pressure water is avoided, the high-pressure water jet slotting coal breaking capacity is greatly improved, and the service life of equipment is prolonged.

The invention discloses a drilling method for a mother board of a circuit board. According to the method, after drilling is completed every time, drilling dirt can be more effectively discharged out of the hole, the hole blocking phenomenon caused by excessive accumulation of the drilling dirt is avoided, the heat dissipation efficiency of the inner-layer thick copper drill hole can be improved, the bad problems that the roughness in the hole is too large due to too large heat and the like are solved, and meanwhile the problem that a drill point is broken is solved; the tool retracting speed is correspondingly reduced to 320 mm/s, so that the smoothness of the wall of the drilled hole is improved; a segmented drilling method which is the same as a back drilling method is adopted, so that the heat dissipation efficiency of drilling is effectively improved; in the plasma chemical reaction, particles playing a chemical role are mainly positive ion and free radical particles, the effect on different materials is uniform, and the drilling dirt removing effect is good. Through testing, the working environment in the drilling process is clean and tidy, stains are reduced, and the tidiness in the mother board drilling process is improved.