3807 results about "Steel belt" patented technology

In most cases, a hot, corrosive atmosphere is created in, for example, a semiconductor wafer processing chamber. When an arm including belts, such as steel belts, is moved into such a semiconductor wafer processing chamber, the belts are exposed to the hot, corrosive atmosphere. Belts, such as steel belts, have limited heat resistance and corrosion resistance and the hot, corrosive atmosphere in the processing chamber shortens the life of the belts. A carrying device of the present invention has a frog leg type arm (3) and a wafer holder (4) connected to the frog leg type arm (3). The wafer holder (4) is pivotally connected to front end parts of a first front arm (8A) and a second front arm (8B) by coaxial joints (10). The wafer holder (4) is linked to the first front arm (8A) and the second front arm (8B) by a posture maintaining linkage (5) including two antiparallel linkages capable of controlling the turning of the wafer holder (4) relative to the first and the second front arms (8A, 8B).

A tire assembly with integrated power generation features includes one or more piezoelectric devices configured to generate electric charge therein upon being subjected to mechanical strains associated with flexure of tire or wheel components. The piezoelectric device may be incorporated in a variety of tire structures and in many different locations. In pneumatic tire structures, the piezoelectric device and related electronics may be embedded in crown or sidewall locations among such selected components as the exterior tread portion, first and second steel belts of a belt package, carcass, cap ply portion, inner liner, zone base, etc. The piezoelectric device with optional rubber casing may also be attached to such locations as the inner liner and tire exterior. Piezoelectric devices may also be integrated with a tire and safety support combination that is configured to operate in an extended mobility mode when the tire structure loses air pressure. Piezoelectric devices may alternatively be integrated with a non-pneumatic structurally supported tire such as one including a reinforced annular band, a plurality of web spokes extending transversely across and radially inward from the annular band, a mounting band at the inner end of the web spokes and a tread portion disposed on the annular band.

The invention provides a high-carbon high-chromium high-niobium cast iron self-protection flux-cored wire. The flux-cored wire has a steel belt as an outer skin. The flux core comprises the following components in weight percentage: 10 to 30 percent of ferroniobium, 20 to 30 percent of high carbon ferrochrome, 0.1 to 3 percent of V, 0.2 to 3 percent of W, 0.6 to 0.8 percent of ferromanganese, 0.2 to 0.8 percent of 75 ferrosilicon, 20 to 30 percent of chromium carbide, 5 to 12 percent of graphite, 1 to 10 percent of aluminum-magnesium alloy, 1 to 5 percent of silicon carbide and 1 to 3 percent of ferroboron; and the percentage of a counter weight is between 46 and 54 percent. The high-carbon high-chromium high-niobium cast iron self-protection flux-cored wire has the advantages of high hardness, good wear resistance, good oxidation resistance and strong shock resistance, and is widely applied to grinding rolls and grinding disks of coal grinding machines in thermal power plants and cement plants, material charging equipment in blast furnaces(material charging slots, receiving cones, material storage areas and sieve plates), slag vertical mills, hammer heads and rollers of crushers and sintering equipment workpieces in steel plants.

The present invention is high magnetic induction and high grade non-orientation electrical steel and its making process. The high magnetic induction and high grade non-orientation electrical steel consists of C not more than 0.0050 wt%, N not more than 0.0030 wt%, Si 1.50-2.50 wt%, Al 0.80-1.30 wt%, Mn 0.20-0.50 wt%, P not more than 0.030 wt%, S not more than 0.005 wt%, Sb 0.03-0.10 wt% or Sn 0.05- 0.12 wt%, and B 0.0005-0.0040 wt%, except Fe and inevitable impurities. Its making process includes initial rolling and high temperature winding to obtain ideal hot rolled steel belt structure; cold rolling to provide the energy for crystal grain growth in re-crystallizing annealing, and re-crystallizing annealing in controlled temperature to obtain ideal crystal grain structure. It has excellent surface quality, high magnetic induction and low iron loss, and is suitable for use in high efficiency motor iron core.

A process for manufacturing carbon-steel strip having a thickness of less than or equal to 10 mm directly from liquid steel, by casting said liquid steel between the lateral surfaces, made of copper or copper alloy, of two internally cooled rotating horizontal rolls.

An apparatus for forming the stainless steel band used for the composite steel-aluminum conductor rail is composed of decoiler, guiding-leveling machine, shearing-butt welding machine, servo feeder, punch machine, rolling set and sizing-cutting off machine.

The invention discloses a suspended line walking robot which comprises a walking part and a suspending cabin, wherein the walking part consists of two trunks and three driving wheel claws; the two trunks form double parallelogram structures; the three driving wheel claws are guaranteed to face toward the same direction; five motors on the trunks drive the trunks to longitudinally swing, transversely swing and stretch to ensure that each obstacle detouring driving wheel can realize three-freedom-degree translational upper and lower lines; each driving wheel claw comprises a driving wheel and a clamping device, and the motors drive the driving wheels to ensure that the robot moves on the line; each clamping device comprising a motor, a ball screw pair, a spring, a clamping wheel, and the like guarantees that enough friction force is maintained between the driving wheels and the lines; the suspending cabin and the walking part are connected through two steel belts; and two motors on the suspending cabin adjust own gravity center position relative to the trunks through a steel belt so as to guarantee the flexibility of the mechanism while crossing an obstacle. The invention guarantees that the line walking robot can cross various line obstacles including corner line towers, can climb a diagonal tensile line larger than 60 degrees, has high safety factor and can replace man power to realize autonomous line walking.

The invention discloses a steel plate for stamping and quenching and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.14 to 0.28 percent of C, less than 0.40 percent of Si, 0.4 to 2.0 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 0.016 to 0.040 percent of Al, 0.15 to 0.8 percent of Cr, 0.015 to 0.12 percent of Ti, 0.001 to 0.005 percent of B, less than or equal to 0.005 percent of N, and the balance of Fe and unavoidable impurities. The manufacturing method comprises the following steps of: heating a blank to 1,150 to 1,250 DEG C, preserving heat for 2.5 to 4 hours and performing rough rolling, and then performing finish rolling under multichannel pressure and at the final rolling temperature of between 830 and 950 DEG C, performing laminar cooling, and cooling to the rolling temperature at the cooling speed of more than 10 DEG C/s and the rolling temperature of between 600 and 680 DEG C. The cold-rolled steel plate is obtained by the following steps of: performing cold rolling on a hot rolled steel strip, annealing through a pure hydrogen gas cover furnace, and oiling and packaging. The annealing temperature is 550 to 650 DEG C and the heat preserving time is 3 to 5 hours. The steel has a simple component design and high hardenability. The depth of a hardening layer of more than HRC45 is 10 to 16mm. The steel plate consists of ferrite and pearlite. After thermal stamping and quenching, an all-martensite structure can be obtained. The tensile strength is above 1,300N/mm<2>.

The invention relates to a heat treatment method of a steel strip for packaging, comprising the following steps: a) the steel trip is heated to the austenitizing temperature; b) isothermal quenching is carried out in molten lead; c) the lead is scraped off in a carbon tower; and d) the strip is cooled by water. The heat treatment method is characterized in that the temperature range of the isothermal quenching in the step b) is 355-365 DEG C and the isothermal quenching time is 21-28s. The invention further discloses a steel strip for packaging obtained by the heat treatment method. The components of the steel strip (by weight percentages) are as follows: 0.29-0.35% of C, 0.15-0.35% of Si, 1.20-1.55% of Mn, not more than 0.030% of P, not more than 0.030% of S and Fe. The heat treatment method solves the problems that tensile strength of the existing steel strips for packaging can not exceed 1250MPa, the elongation after fracture is less than 6%, and the two-phase region quenching profile of a sheet is poor.

A method for making structural automotive components and the like provides a strip of high strength steel having a selected thickness. A predetermined thickness of a metal coating, such as nickel, is applied to the opposite faces of the steel strip. The coated steel strip is cut to form a blank. The blank is heated in a generally open atmosphere to a temperature in the range of 800° C. to 1000° C. within less than ten minutes, thereby diffusing at least a portion of the metal coating a predetermined distance into the faces of the steel strip portion of the blank to alleviate scale formation, and simultaneously raise the temperature of the blank for hot forming the same. The heated blank is hot formed in a pressing tool, and cooled therein to heat treat the formed component through microstructure phase change, without substantial scale formation, such that the component need not be descaled prior to post-form processing and/or assembly in a vehicle.

The invention discloses a production method of an emulsified explosive, which comprises the following steps that: water phase and oil phase are prepared, and then water phase solution is added into oil phase solution to be emulsified by an emulsifier to prepare a latex matrix, and simultaneously a cooling steel strip controls the temperature of the latex matrix to be 90 to 105DEG C; and the matrix is cooled, the cooled latex matrix is added into a sensitizing machine, and then one or two of perlite and chemical blowing agent is added in for sensitization; and then the explosive is charged, and finally the loaded explosive is packaged to prepare the emulsified explosive. The production method of the emulsified explosive has the advantages of reducing the production cost, having no waste explosive, waste material, waste gas, waste water and dust in production, realizing the free switching of a plurality of sensitization methods, such as physical sensitization, chemical sensitization and physical and chemical composite sensitization, so as to meet the needs of different consumers; perlite is adopted for physical sensitization, and can improve the explosion performance and the storage performance; and the production method of the emulsified explosive can adapt to the requirements of small-diameter explosive charging and full-automatic packaging automatic calandria.

The continuous steel belt punching production line incldues steel belt unwinding machine, straightening machine, material storage in the back of the straightening machine, numerically controlled feeding mechanism connected to the material storage, pressing machine, material thrower, laser ranger, two regulating trays in the tail and the feeding end of the numerically controlled feeding mechanism separately and electric controller unit. By means of the PLC program controller in the electric controller unit, the production line can punch continuously and automatically in high production efficiency and high product precision.

The present invention provides a three-section cooling process by laminar flow for hot-rolled steel strip. Said process adopts the computer laminar flow cooling control, and is characterized by that the steel strip can be divided into three sections for cooling, first section is head portion section whose length is 30 m, second section is intermediate section of the steel strip, and third section is the tail portion section whose length is 20 m, and the cooling temperatures of said three sections are respectively controlled in that its intermediate section temp. is equal to the objective coiling temp., its head portion section temp. is 20-50 deg.C higher than that of objective coiling section, and its tail portion section temp. is 20-40 deg.C higher than objective coiling temp. Said invention can improve the performance uniformity of steel strip.

The invention relates to a vapour generator for the deposition of a metal coating onto a substrate (7), preferably a steel strip, that comprises a vacuum chamber (6) in the form of a housing including a vapour deposition head or ejector (3) in tight communication via a supply duct (4) with at least one crucible (1) containing the coating metal in a liquid form and located outside the vacuum chamber (6), characterised in that the ejector (3) includes a longitudinal slot for the vapour outlet acting as a sonic throat and extending on the entire width of the substrate (7), a filtration medium or a charge loss member (3A) made of a sintered material being provided in the ejector immediately before said slot on the vapour path in order to equalise the flow speed of the vapour exiting the ejector (3) through the sonic throat.

A blank cut from a strip of hardenable hot-formed steel is heated in a furnace to a temperature which is smaller than an Ac₃ transformation point in an iron carbon diagram. A first region of the blank is then heated in a conductive heating station to a temperature above the Ac₃ transformation point and subsequently hardened in a hot forming and hardening tool to produce a steel part with at least two microstructured regions of different ductility.

The invention discloses a method for producing a hot rolled steel band used for an automotive frame, comprising the following steps: the pretreated liquid iron is smelt conventionally in a top and bottom combined-blowing revolving furnace, argon is blown at the bottom of the furnace in the whole process, the contents of carbon, phosphorus, silicon and manganese at the terminal of the liquid iron are controlled; the liquid iron discharged from the furnace is refined by an LF furnace, argon is blown to the liquid iron and is stirred and decarbolized at the same time of blowing the argon at the bottom of the LF furnace in the whole process, the liquid iron is subjected to microalloying by adding vanadium, titanium, niobium alloy or niobium and titanium alloy, the content of the microalloy in the liquid iron is controlled to between 0.15 and 0.20 percent, the refined liquid iron is continuously cast into a casting blank through a CSP sheet billet conticaster, the casting blank is soaked in a roller-hearth type soaking furnace and is rolled initially through a vertical miller as well as is sent to a finishing mill set to be rolled, the rolling force of each stander and the finishing temperature of the steel band are controlled, and the hot rolled steel band is cooled through a laminar flow and is cut by a pair of flying shears as well as is wound into a steel coil through a recoiling machine. The produced steel band in 510 L and 590 L or 610 L used for the automotive frame has excellent comprehensive mechanical property, and technique processing and welding performances, can be taken as the automotive frames of a light truck, a medium truck and a heavy truck as well as an agricultural automobile and has remarkable benefits.

A steel strip for J55 petroleum casing with high strength and high toughness petroleum casing and a manufacture method thereof belong to the field of micro-alloyed steel production technology. The method comprises converter smelting, LF refining, medium-thin slab continuous slab, heating, high-pressure water descaling, hot rolling and laminar cooling, and reeling, wherein the chemical components of steel comprise (wt%) C 0.15 to 0.20, Si 0.15-0.30, Mn 1.00 to 1.45, P not larger than 0.020, S not larger than 0.010, Nb 0.020 to 0.040, Ti 0.015 to 0.040, Al 0.020 to 0.050, and allowance Fe and other in inevitable impurities. A J55 petroleum casing with a yield strength of 420 MPa can be produced by combining Nb and Ti, micro-alloying and reasonable production process, and the product has the advantages of high strength, high toughness and good solderability.

The invention relates to a flux-cored wire for austenitic stainless steel all-position welding, and the flux-cored wire is composed of a flux core and an external stainless steel belt, wherein, the flux core accounts for 22-24wt% of the flux-cored wire, and the flux core comprises the following components in percentage by weight: 20-23% of metal chromium powder, 7-8.5% of metal nickel powder, 2-4% of electrolytic manganese metal, 3-4% of aluminium powder, 0.5-1% of ferrotitanium, 32-34% of rutile, 1-2% of quartz, 2-4% of zircon sand, 4-6% of albite, 2-4% of potassium feldspar, 1-1.5% of cryolite, 1-1.5% of lithium carbonate, 0.1-0.5% of bismuth oxide and the balance of iron powder. The ratio of the albite to the potassium feldspar in the flux core is 1.2-2, the sum of the albite and the potassium feldspar is not more than 10wt% of the flux core, the external stainless steel belt is the austenitic stainless steel 304L, the carbon content is less than 0.025wt%, the diameter of the flux-cored wire is 0.9-1.2mm, and the flux-cored wire can be used for realizing the austenitic stainless steel all-position welding.

The present invention provides a high strength thin excellent workability and galvanizability, having a composition comprising from 0.01 to 0.20 wt. % C, up to 1.0 wt. % Si, from 1.0 to 3.0 wt. % Mn, up to 0.10 wt. % P, up to 0.05 wt. % S, up to 0.10 wt. % Al, up to 0.010 wt. % N, up to 1.0 wt. % Cr, from 0.001 to 1.00 wt. % Mo, and the balance Fe and incidental impurities, wherein a band structure comprising a secondary phase has a thickness satisfying the relation Tb/T<=0.005 (where, Tb: average thickness of the band structure in the thickness direction of steel sheet; T: steel sheet thickness), and a manufacturing method thereof, and a manufacturing method of a high strength hot-dip galvanized steel sheet or a high strength galvannealed steel sheet applying hot-dip galvanizing or further galvannealing, and giving an excellent workability, a high tensile strength, and excellent galvanizability, coating adhesion and corrosion resistance.

An uncoiling blanking forming method comprises the following steps that 1) steel coil uncoiling is carried out, namely a steel belt after steel coil uncoiling is subjected to washing and straightening and enters a blanking zone through a clamping conveying roller; 2) laser blanking is carried out, namely a steel coil enters the blanking zone, a laser blanking mode is used, a material piece with the needed shape is formed by cutting of a laser cutting head, and waste materials fall down and are output; 3) material piece output is carried out, namely the material piece is conveyed through a magnetism stretching conveying belt machine and then is carried to a stamping procedure through a mechanical arm or a robot; 4) stamping forming is carried out, namely the material piece is subjected to stamping and is machined into a workpiece; and 5) checking is carried out, namely the workpiece is checked and put in storage. The method can achieve series connecting of a blanking line and a stamping forming line, matching can be achieved, the middle links such as stacking, packing, conveying, locating, unpacking, conveying and position centering of piece materials and stamping forming workpieces and transferring sites are reduced, the technology processes are simplified and connected in series, and by laser blanking, coiling materials are directly machined into forming pieces.

Apparatus for heat-treating an elongate structural body part made from a blank compressed while being soft or from steel strip of hardenable 22 Mn B5 mod. steel sheet with a thickness of 1 mm to 3 mm, includes an apparatus for positioning the structural body part in substantially upright disposition. Placed in surrounding relationship to the structural body part is an induction element which can move from bottom to top, thereby being able to follow a contour of the structural body part and allowing to at least partially heat the structural body part to an austenitizing temperature suitable for hardening. Disposed adjacent to the induction element is a cooling unit which follows the induction element in movement direction. The induction element and the cooling unit are moveable relative to one another and connected to a tool carriage which is mounted to a column for movement in a vertical direction, in a transverse direction to the column and about a horizontal axis.

Coated steel having a well defined and uniform thickness is useful and advantageous for preparing products by hot stamping. Products prepared by hot stamping such a steel are particularly advantageous when subjected to a subsequent spot welding step.

The technological process of making cold rolled precise super-narrow steel belt includes the steps of unwinding, welding, positioning, horizontal rolling, vertical rolling, washing and polishing, coarse rolling, heat treatment, finishing rolling, straightening, leveling, winding, packing, etc. The corresponding apparatus includes successively connected unwinder, positioner, leveler, straighener,rolling mill, winding machine, tension regulators, cold rolling emulsion blowing and washing unit, and width and thickness measurer.

The invention discloses an on-line heat preservation and slow cooling device for a steel belt manufacturing assembly line. The on-line heat preservation and slow cooling device comprises a steel belt roll tray and a heat preservation cover, a V-shaped groove is formed in the upper end of the steel belt roll tray, the lower end of the steel belt roll tray is connected with the assembly line, and a rectangular chassis is arranged at the middle portion of the steel belt roll tray; the heat preservation cover is arranged on the chassis to define a heat preservation cavity, an inner cavity at the upper portion of the heat preservation cover is matched with a steel belt roll in shape and is arc, the lower portion of the heat preservation cover is in a pipe shape, and the cross section of the lower portion of the heat preservation cover is matched with the chassis; the chassis and the heat preservation cover are both of multi-layer composite heat preservation structures, and each multi-layer composite heat preservation structure comprises a radiant heat reflection layer, a heat isolation layer and a protection layer; the radiant heat reflection layers are arranged on the inner surfaces of the heat preservation cavity; the protection layers are arranged on the outer surface of the heat preservation cavity; and the heat isolation layers are arranged between the radiant heat reflection layers and the protection layers. The heat preservation and slow cooling device is arranged in a conveying link of the steel belt roll subject to hot rolling, deformation caused by substantial temperature variation of the steel belt roll in the conveying link is prevented, and influences on the follow-up processes are eliminated.

The invention provides a horizontal moving steel band recoiling device, which comprises a band releasing device and a band take-up device. The band releasing device comprises a steel band roller, a rotating disk, a steel band tensioning device, a steel band disk, a tensioning arc plate, a brake, a brake turnplate, a tensioning cylinder, a push seat, a synchronous belt and an encoder. The band take-up device comprises a groove device, a lifting tray, a synchronous belt, a servomotor, a ball screw pair, linear guide rail pairs, a variable speed reducer, a bobbin and an encoder for counting meters, wherein the synchronous belt is connected with the ball screw pair; a feed screw nut is connected with a sliding case; the sliding case is provided with four slide blocks; on the two linear guide rail pairs, a reciprocating stroke realizes reversing by approaching a positioning switch; the bobbin is connected with a motor with the encoder and the variable frequency speed reducer; the steel band is provided with the encoder for counting meters between the groove device and the bobbin. The device has high automatic degree, reduces labor intensity, and improves safety.

The invention belongs to the field of welding materials and discloses chemical powder components of a 2507 type super double-phase stainless steel flux-cored wire. A common 304L stainless steel metal strip is used as an outer skin; the chemical powder components are filled inside the common 304L stainless steel metal strip to be rolled into a flux-cored wire. The chemical powder components of the 2507 type super double-phase stainless steel flux-cored wire are characterized by comprising the following components in percent by mass: 19 percent-38 percent of rutile, 3 percent-5 percent of zircon sand, 2 percent-4 percent of potassium fluoroaluminate, 1 percent-2 percent of aluminium magnesium alloy, 1 percent-3 percent of chromium nitride, 30 percent-35 percent of metallic chrome, 8 percent-10 percent of metallic nickel, 1 percent-2 percent of electrolytic manganese metal, 14.5 percent-20 percent of metallic molybdenum and 0.5 percent-1 percent of antimony oxide. In the invention, the steel pipe made from the 304L stainless steel strip (with the specification of 10*0.4mm) filled with the chemical powder is manufactured into the super double-phase stainless steel flux-cored wire according to the general production process. CO2 is used as welding protection gas for the flux-cored wire, and the flux-cored wire has the characteristics of good welding operation process performance, attractive welding line moulding, excellent welding process performance, favorable balance of welding tissue austenite and ferrite and the like.

The invention discloses methyl sulfonate tinning electrolyte using cerium salt as an additive. The electrolyte comprises the following components: 30 to 120 g/L of stannous methyl sulfonate, 60 to 180 g/L of methylsulfonic acid, 1 to 10 g/L of cerium sulfate, 0.1 to 2 g/L of antioxidant, 5 to 10 g/L of brightening agent and 5 to 10 g/L of surfactant. The invention also discloses a method for tinning a steel strip or a steel plate by adopting the electrolyte. During plating, the cerium salt in the electrolyte lightens the harm degree of 'hydrogen brittleness', and plays roles of the antioxidant and the brightening agent. On the basis of adaptability to the environment, the electrolyte meets the requirements that the process is simple, the solution is stable, the maintenance is easy and the quality of a coating is high.

A technique for producing flux-cored wires by using disc round steel wire bars is characterized by comprising following steps: using disc round steel wire bars as raw materials; producing accurate steel bands used for flux-cored wires exclusively; producing semi-finished products which are flux-cored wire blank tubes by using accurate steel bands; producing termination products by drafting to reduce the diameter thereof with a high speed; packaging the termination products by winding with a high speed. The advantages of the invention are: the invented technique uses high-speed hot-rolling disc round steel wire bars to replace broad cold-rolled steel strip, so that the raw material cost is reduced greatly; the continuous overlong endless accurate steel bands are used to save assistant procedure time for welding steel band joints, reduce end breakage rate during rolling and drafting procedures, improve continuous operation rate, and further reduce production cost; the invented technique uses high-speed accurate cold tandem rolling machine group to solve the problem that the sheet iron rolling precision is difficult to be controlled when rolling flux-cored wires by using disc round steel wire bars directly, and the filling precision is improved greatly since size accuracy of the flux-cored wire exclusive use accurate steel bands is high.

The invention discloses a special flux-cored wire for surfacing repair of a BD roller, which consists of a tube skin and a flux core, wherein the tube skin is an H08A steel strip, and the flux core comprises the following components by weight percent: 15-25% of high-carbon ferrochrome, 2-10% of micro-carbon ferrochrome, 5-7% of metal manganese, 6-12% of ferromolybdenum, 3-10% of ferrotungsten, 5-10% of ferrovanadium, 0.5-6% of ferrotitanium, 0.3-5% of yttrium-based rare-earth, 1-3% of ferrocolumbium, 4-10% of cryolite and 10-50% of ferrous powder, wherein the filling coefficient is 30-45%. The special flux-cored wire selects a Cr-Mo-W-V alloy system with optimal alloy matching and carries out Ti-Nb-Re micro-alloy grain refinement, thereby leading a surfacing repair layer to have the advantages of high hardness, high wear resistance, high toughness and high anti-cold and hot alternating thermal fatigue performance, and exponentially prolonging the service life of the BD roller after surfacing repair in comparison with the BD roller after the ordinary roller flux-cored wire repair.

The invention relates to a three-soft-coal-layer reciprocating-type coal-pillar-free fully-mechanized mining method which comprises steps as follows: a plurality of parallel adjacent working surfaces are arranged and exploited sequentially, wherein every two adjacent working surfaces are alternately exploited by a forward coal mining process and a backward coal mining process; in the drifting process, the roadway is combinedly supported by anchor rods, anchor cables, metal meshes and W-shaped steel tapes; and in the stoping process, the haulage roadway adopts gob-side entry retaining. The invention implements supporting in a combined support mode, and the anchor cables, anchor rods, metal meshes and W-shaped steel tapes constitute the support body; as the working surface exploitation lower gangway adopts gob-side entry retaining, the three soft coal layers have favorable support effect and entry retaining effect; and compared with the subsequent retreat-type coal mining, the invention can reduce the stoping roadway by 25-40% for one mining area, and enhance the resource recovery rate by 10-15%.