Explosion particle for repairing rock mass crack by using water pressure, preparation method and repairing method

The invention discloses an explosive particle for repairing rock mass cracks through water pressure, a preparation method and a repairing method, and relates to the technical field of rock mass crack repairing, the explosive particle comprises a shear-resistant gel film and a water-soluble film wrapping the shear-resistant gel film, the shear-resistant gel film is a calcium alginate gel film, and the water-soluble film is a polyvinyl alcohol film; urea is wrapped in the shear-resistant gel film, nutrient substances and microorganisms with urease in the body are arranged between the shear-resistant gel film and the water-soluble film, and when the external water pressure is larger than the shear strength of the shear-resistant gel film, the shear-resistant gel film is broken to release the urea in the shear-resistant gel film. According to the explosive particles for repairing the rock mass cracks by utilizing the water pressure, the preparation method and the repairing method, provided ...

Explosion particle for repairing rock mass crack by using ammonia nitrogen, preparation method and repairing method

The invention discloses an explosive particle for repairing rock mass cracks by ammonia nitrogen, a preparation method and a repairing method, and relates to the technical field of rock mass crack repairing. The explosive particle comprises a gel film and a water-soluble film wrapping the gel film; the gel film is prepared from the following raw material components: modified bentonite, zeolite powder, hydrophilic titanium dioxide, a sodium carboxymethyl cellulose solution and an agarose solution; the water-soluble film is a polyvinyl alcohol film; urea is wrapped in the gel film, nutrient substances and microorganisms with urease in the body are arranged between the gel film and the water-soluble film, the gel film can adsorb ammonium ions in water and react with the ammonium ions, and the gel film can be broken to release the urea in the gel film after reacting with the ammonium ions. According to the explosive particles for repairing rock mass cracks by using ammonia nitrogen, the preparation ...

Argon-blowing prefabricated member for continuous casting tundish cover

The invention relates to an argon-blowing prefabricated member for a continuous casting tundish cover and belongs to the technical field of ferrous metallurgical equipment. Argon-blowing prefabricated members with difference sizes can be designed according to the size of a baking hole, a charging hole, a plug hole and the like of the tundish cover. The argon-blowing prefabricated member comprisesa prefabricated member body; the argon-blowing prefabricated member body has a shape of a cone of which the radius of the upper bottom is greater than that of the lower bottom, or the longitudinal section structure of the prefabricated member body is T-shaped. The prefabricated member body is hollow, an aeration pipeline is arranged in the prefabricated member body, and the prefabricated member body is provided with an aeration hole communicated with the aeration pipeline. The argon-blowing prefabricated member solves the problems that the peripheries of the baking hole and the plug hole are deformed ...

Method for preparing bearing steel

The invention relates to a method for preparing bearing steel. The method comprises the following steps of smelting, and alloying; carrying out continuous casting; rolling; carrying out slow cooling, and the like. The chemical components in the bearing steel are controlled in percentage by weight as follows: 0.95%-1.05% of C, 0.20%-0.30% of Si, 0.30%-0.35% of Mn, 0.02%-0.05% of Mo, 1.45%-1.48% of Cr, 0.015%-0.035% of AlS, less than or equal to 0.05% of Cu, less than or equal to 0.025% of S, less than or equal to 0.025% of P, less than or equal to 0.05% of Ni, less than or equal to 12*10<-6> of [O], less than or equal to 2*10<-6> of [H] and the balance of Fe and inevitable impurities. According to the bearing steel produced through the method disclosed by the invention, the total oxygen content of a steel product can be stably controlled below 8 ppm, non-metallic inclusions are low in content and uniformly distributed, and good casting blank structure homogeneity, steel quality stability ...

Continuous casting tundish for improving cleanliness of molten steel

Steel for petroleum sleeve connecting piece and production method of steel

The invention discloses steel for a petroleum sleeve connecting piece and a production method thereof and belongs to the technical field of metallurgy. The steel for the petroleum sleeve connecting piece comprises the following chemical components in percent by mass: 0.29-0.30% of C, 0.25-0.28% of Si, 0.51-0.54% of Mn, 0.008-0.012% of P, 0.003-0.006% of S, 0.96-0.97% of Cr, 0.190-0.200% of Mo, 0.024-0.030% of Alt, 50*10<-4>-58*10<-4>% of N, 12*10<-4>-14*10<-4>% of T.O and balance of Fe and inevitable impurities. The production method of the steel for the petroleum sleeve connecting piece comprises the following production processes: electric furnace primary smelting, LF (low frequency) refining, VD (vacuum degassing), continuous casting, slowly cooling of a casting blank, testing and finishing. Cleanliness, tissue compactness and uniformity of a continuous casting round billet, obtained by adopting the production method, for the petroleum sleeve connecting piece are greatly improved, and ...

Continuous casting tundish for improving cleanliness of molten steel

The invention discloses a continuous casting tundish for improving cleanliness of molten steel and belongs to the field of ferrous metallurgy technology. The continuous casting tundish comprises a tundish, porous bricks, an overflow groove, a slag blocking wall and a dam. The continuous casting tundish for improving cleanliness of molten steel provided by the invention makes full use of the double effects of argon foam stirring and cleaning, is safe, practical, simple and convenient, can obviously improve the separation effect of impurities and gases in the molten steel and improve the cleanliness of the molten steel and the quality of billet steel and the like.

Construction method used for combined dynamic compaction treatment of lake region soil-rock mixed filling roadbed

The invention relates to a construction method used for combined dynamic compaction treatment of lake region soil-rock mixed filling roadbed, and the construction method is as follows: (1), throwing stones to packing sedimentation to a designed elevation; (2) leveling ground, marking the tamping point position; (3) taking a crane in the place, putting a column hammer in the tamping point position, performing first time of tamping, wherein the hammer weight is 15.5t, the hammer bottom diameter is 1.4m, the falling distance is 12m, the point tamping time is 8, and the tamping energy is 1860kN.m; (4) replacing the tamping point, repeating (2) and (3) to complete the first time of tamping and leveling the ground; (5) taking the crane in the place, putting the column hammer in the tamping point position, performing second time of tamping, wherein the point tamping time is 5, and the tamping energy is 1860kN.m; replacing the tamping point, repeating the (5) to complete the second time of tamping ...

Chair of seatpad, compound net cloth of back frame

The utility model discloses a chair of seatpad, compound net cloth of back frame: including chair foot, seatpad, back, handrail, surface recombination net cloth on the seatpad frame of seatpad, the periphery of net cloth is sewed up in the peripheral seatpad embedded groove that sets up of seatpad embedding strip embedding seatpad frame, surface recombination net cloth before the back frame of back, the periphery of net cloth is sewed up in the peripheral back embedded groove that sets up of back embedding strip embedding back frame, seatpad embedding strip, back embedding strip can be the rubber strips, also can be the cowhells strips. Beneficial effect lies in: preparation, simple to operate can practice thrift net cloth, reduce manufacturing cost, improve the product competitiveness.

High-strength high-toughness wear-resisting steel for excavator bucket teeth and manufacturing method thereof

The invention relates to high-strength high-toughness wear-resisting steel for excavator bucket teeth and a manufacturing method thereof. The high-strength high-toughness wear-resisting steel comprises the following components in percentage by weight: 0.23-0.27% of C, 0.001-0.025% of P, 0.90-1.20% of Si, 0.001-0.025% of S, 2.20-2.60% of Mn, 0.10-0.30% of Cr, 0.30-0.40% of Mo, 0.10-0.30% of Cu, 0.08-0.12% of V, 0.10-0.30% of Ni, 0-15*10<-4>% of [O], 0.015-0.040% of Al and the balance of Fe and inevitable impurities. The invention also provides the manufacturing method of the steel for the excavator bucket teeth. The prepared low carbon silicon-magnesium-molybdenum-vanadium alloy has high strength, high toughness and high purity and is used for forging the excavator bucket teeth working in severe environments.

Vibration test tool for guide electromagnet of high-speed maglev train

The utility model discloses a vibration test tool for a guide electromagnet of a high-speed maglev train, which is characterized by comprising a vibration tool framework and an electromagnet fixing mounting seat used for fixing the guide electromagnet on the vibration tool framework, the electromagnet fixed mounting seat comprises a fixed seat arranged on the vibration tool framework and a fixed plate fixedly connected with the guide electromagnet, and the guide electromagnet is hung on the vibration tool framework through the insertion and hanging connection of the fixed plate and the fixed seat. According to the suspension frame for simulating the maglev train, the guide electromagnet is firmly fixed on the tool, the structural strength of the guide electromagnet is ensured in a high-strength vibration test, the frequency response characteristic of the guide electromagnet is not influenced, and the installation state of a real train is simulated to the maximum extent. And meanwhile, the ...

Multi-element alloyed ultrahigh-strength sucker rod steel and manufacturing method thereof

The invention relates to a multi-element alloyed ultrahigh-strength sucker rod steel and a manufacturing method thereof. The sucker rod steel comprises the following components in percentage by weight: 0.25 to 0.29 percent of C, 0.17 to 0.37 percent of Si, 0.50 to 0.70 percent of Mn, 0.95 to 1.20 percent of Cr, 0.18 to 0.25 percent of Mo, 0.005 to 0.025 percent of P, 0.001 to 0.025 percent of S, 0.015 to 0.050 percent of Al, 0.015 to 0.050 percent of Ti, less than or equal to 20ppm of [O], less than or equal to 3ppm of [H], and the balance of Fe and inevitable impurities. The steel has excellent comprehensive performance and long fatigue life, and is suitable for oil recovery operation of heavy and overload oil wells.

Vibration test tool for brake electromagnet of high-speed maglev train

The utility model discloses a high-speed maglev train brake electromagnet vibration test tool, which comprises a vibration tool framework, a pair of first electromagnet mounting seats arranged on the vibration tool framework, and a pair of second electromagnet mounting seats used for being connected with the back of a brake electromagnet, the first electromagnet mounting seat is connected with the brake electromagnet and then inserted into the corresponding second electromagnet mounting seat, the second electromagnet mounting seat is a T-shaped electromagnet mounting seat, and a mounting part clamping device is arranged at a mounting interface. Structural strength is guaranteed in a high-strength vibration test, frequency response characteristics of the brake electromagnet are not affected, a real vehicle installation state is simulated to the greatest extent, an installation interface of the electromagnet is provided with an installation part clamping device to vertically clamp and reinforce ...

Rear part visualization detection apparatus for wearing of shield machine cutter and method thereof

The invention discloses a rear part visualization detection apparatus with characteristics of safety, convenience, economy and reliability for wearing of a shield machine cutter and a method thereof. The rear part visualization detection apparatus for wearing of the shield machine cutter comprises a camera device, a lighting device, a slushing apparatus, a first propulsion apparatus, a second propulsion apparatus, a data acquisition and analysis device, and a shield machine bubble cabin, three circular holes are arranged on the front wall of the shield machine bubble cabin, the circular holes are welded with a spherical hinge and respectively install with a ball valve for connecting the camera device, the lighting device and the slushing apparatus, the first propulsion apparatus is respectively connected to the camera device and the lighting device in a threaded mode, the second propulsion apparatus and the slushing apparatus are connected in the threaded mode, the camera device is connected ...

45BM steel for caterpillar track pin roll and manufacturing method thereof

The invention discloses a 45BM steel for a caterpillar track pin roll, comprising the components by weight percent: 0.43-0.47% of C, 0.17-0.35% of Si, 0.60-0.80% of Mn, 0.005-0.025% of P, 0.001-0.020% of S, 0.01-0.20% of Cr, 0.01-0.20% of Ni, 0.01-0.20% of Cu, 0.0005-0.0030% of B, 0.020-0.060% of Ti, 0.01-0.06% of Al and the rest of Fe and unavoidable impurities. A manufacturing method of the 45BM steel comprises: electric furnace smelting, steel tapping, LF external refining and vacuum degassing (VD) treatment. The reduced molten steel is added with aluminium for finally deoxidization, titanium for nitrogen fixation and ferroboron for alloying after the VD treatment; casting blank is poured by continuous casting; the superheat temperature is 20-30 DEG C, the continuous casting speed is 0.9-1.20m/min, the uniform heating temperature of billet steel in a heating furnace is 1180-1220 DEG C, the heating time is 2.5-3h, the initial rolling temperature is 1100-1150 DEG C, and the final rolling ...

Device and method for visually detecting front part of cutter head of cutter of shield tunneling machine

The invention discloses a device and a method for visually detecting the front part of a cutter head of a cutter of a shield tunneling machine, and the device and the method are safe, convenient, fast, economical and reliable. The device comprises a camera device, a lighting device, a washing device, a first propulsion device, a second propulsion device, a third propulsion device, a data acquisition device and a bubble cabin of the shield tunneling machine, wherein the camera device comprises a front end camera and a lateral camera; the front wall of the bubble cabin of the shield tunneling machine is provided with three circular holes; spherical hinges are welded in the circular holes, respectively, and ball valves for connecting the camera device, the lighting device and the washing device are arranged in the circular holes, respectively; the first propulsion device, the second propulsion device and the third propulsion device are connected with the camera device, the lighting device ...

Novel steel structure air film greenhouse for cement production

The invention relates to the technical field of cement production auxiliary facilities, in particular to a novel steel structure air film greenhouse for cement production. According to the novel steel structure air film greenhouse for cement production, the technical problem that in the prior art, an air film greenhouse is inconvenient to construct is solved. A novel steel structure air film greenhouse for cement production comprises an air film body forming a greenhouse roof and supporting columns used for supporting the air film body, supporting steel cables used for supporting the air film body are arranged between the supporting columns, the supporting columns are arranged and used for forming the shape of the greenhouse in a surrounding mode, the supporting steel cables are arranged at the upper ends of the supporting columns, and the supporting steel cables are used for supporting the air film body. The supporting steel cables are used for supporting the gas film body, the supporting ...

Visual quantitative calibration and analysis method for cutter abrasion of shield tunneling machine

The invention discloses a safe, convenient, economical and reliable visual quantitative calibration and analysis method for cutter abrasion of a shield tunneling machine. The visual quantitative calibration and analysis method comprises three parts of construction of a precise three-dimensional model of the shield tunneling machine, detection on attitude resolving of image data and structural recovery of space scenes, wherein the construction of the precise three-dimensional model of the shield tunneling machine comprises the two steps of construction of a foundation frame of the model of the shield tunneling machine and fining treatment on the three-dimensional model; the detection on the attitude resolving of the image data comprises the three steps of camera calibrating, image acquiring and the attitude resolving; the structural recovery of the space scenes comprises the three steps of image processing, directional operation and cutter abrasion quantitative detection. The visual quantitative ...

45BM steel for caterpillar track pin roll and manufacturing method thereof

The invention discloses a 45BM steel for a caterpillar track pin roll, comprising the components by weight percent: 0.43-0.47% of C, 0.17-0.35% of Si, 0.60-0.80% of Mn, 0.005-0.025% of P, 0.001-0.020% of S, 0.01-0.20% of Cr, 0.01-0.20% of Ni, 0.01-0.20% of Cu, 0.0005-0.0030% of B, 0.020-0.060% of Ti, 0.01-0.06% of Al and the rest of Fe and unavoidable impurities. A manufacturing method of the 45BM steel comprises: electric furnace smelting, steel tapping, LF external refining and vacuum degassing (VD) treatment. The reduced molten steel is added with aluminium for finally deoxidization, titanium for nitrogen fixation and ferroboron for alloying after the VD treatment; casting blank is poured by continuous casting; the superheat temperature is 20-30 DEG C, the continuous casting speed is 0.9-1.20m/min, the uniform heating temperature of billet steel in a heating furnace is 1180-1220 DEG C, the heating time is 2.5-3h, the initial rolling temperature is 1100-1150 DEG C, and the final rolling ...

Multifunctional model test system for tunnel and underground engineering

The invention relates to a multifunctional model test system for tunnel and underground engineering. The test system comprises a rail, a model box, a servo-controlled test loading device, a rotating seat, rotating shafts and a bracket, wherein the rail is arranged on the upper part of the test system; the model box is arranged on the middle part of the test system and comprises an outer frame, an inner frame and an organic glass plate; the servo-controlled test loading device comprises a horizontal loading jack and a vertical loading jack; the rotating shafts are arranged on the two sides of the middle part of the test system; and the rotating seat is arranged on the back surface of the upper part of the test system and is connected with the bracket through a rotating loading cylinder. The system can perform a model test on a block system, rock tunnel excavation, a tunnel chamber, a tunnel group, a side slope, shield excavation and building traversing, has a facade rotating loading function ...