41results about How to "Improve coal loading effect" patented technology

The invention discloses a cutting part of a bottom-clearing roller shearer, each cutting part includes two cutting drums, a first cutting drum (14) and a first cutting drum transmission chamber casing (6) The transition section housing (3) extends to the coal wall (20), and the rear part of the first cutting drum transmission chamber housing (6) extends beyond the middle groove of the scraper conveyor and the groove side (18) of the transition groove, and at the same time The casing (6) of the first cutting drum transmission chamber is bent downward. The first cutting drum of the present invention has enough undercover to avoid the formation of "triangular coal" at the head and tail of the scraper conveyor, and the second cutting drum has a smaller production distance to improve the coal loading effect and ensure sufficient load bearing Strength: Under the same coal mining height, two cutting drums with smaller diameters are selected to be used in pairs to ensure the full height of one-time mining, prolong the service life of the cutting drum, optimize the overall performance of the cutting part, and have good adaptability to changes in coal seam thickness , Reduce costs and process requirements.

The invention provides a thin coal seam bottom clearing type drum shearer. The cutting part housing is composed of the first cutting drum transmission chamber housing, the transition section housing and the second cutting drum transmission chamber housing. The first The casing of the cutting drum transmission chamber extends to the side of the coal wall through the transition section casing to the outside of the middle trough of the scraper conveyor and the side of the transition trough and bends downward. The bottom bevel trimming structure, the inner cavity flanges of the first planetary mechanism and the second planetary mechanism are respectively connected with the inner cavity flanges of the first cutting drum transmission chamber shell and the second cutting drum transmission chamber shell by bolts, The outer end surface key grooves of the first planetary mechanism and the second planetary mechanism are respectively positioned with the outer end surface key grooves of the first cutting drum transmission chamber housing and the second cutting drum transmission chamber housing through end surface flat keys. The invention can effectively solve the problem of triangular coal, meet the minimum mining height condition and the adaptability of coal seam thickness changes, and improve the coal loading effect.

The invention relates to a roller for a mixed row cutting tooth coal winning machine. The roller comprises a roller hub, an end disk, pickaxe-shaped cutting teeth and a square connecting sleeve, wherein the roller hub is trapezoidal; the roller hub is provided with a diameter-variable helical blade; the front part of the diameter-variable helical blade is provided with 1 to 2 rows of pickaxe-shaped cutting teeth arranged in a checkerboard way, while the rear part is provided with a plurality of disk cutter devices arranged in the checkerboard way; and the disk cutter devices comprise an upperconnecting block, a lower connecting block and disk cutter cutting teeth; the upper connecting block and the lower connecting block are welded on the diameter-variable helical blade; and the disk cutter cutting teeth, the upper connecting block and the lower connecting block are integrated into a whole through bolts. According to the characteristics of compression resistance and low tensile resistance of coal beds, different axial coal dropping amounts along the roller, the gradual diameter change of the blade and the trapezoidal appearance, the coaling effect of the roller is improved by about 15 percent compared with that of the conventional cylindrical roller, and the lump coal cutting rate is improved by 7 percent; and the roller is suitable for mining low coal beds with the coal bed thickness of below 1.3m and the dip angle of between 0 and 25 degrees. The roller has the advantages of simple and compact structure, convenient operation, good cutting effect, good coaling effect andhigh rock breaking ability.

The invention discloses a thin-seam coal mining machine and a chute type coal blocking mechanism thereof. The coal mining machine comprises a rocking arm, the chute type coal blocking mechanism and a rotary drum, wherein the rocking arm comprises a rocking arm shell; the chute type coal blocking mechanism comprises a main coal blocking plate, a connecting rod, a chute pin, a chute plate and an auxiliary coal blocking plate; the main coal blocking plate of the chute type coal blocking mechanism is arranged in an interval formed between the end faces of the rotary drum and the rocking arm; the auxiliary coal blocking plate of the chute type coal blocking mechanism is arranged above the top surface of the rocking arm; the main coal blocking plate is connected with the rocking arm shell, is hinged with the connecting rod and is supported and limited by the connecting rod; the connecting rod is connected with a chute in the chute plate and can slide from a first end to a second end; the chute plate is fastened to the rocking arm shell and is located; the auxiliary coal blocking plate is hinged with the main coal blocking plate. According to the thin-seam coal mining machine, a coal charging effect can be improved; by utilizing the interval between the end faces of the rotary drum and the rocking arm and the space above the top surface of the rocking arm, a coal blocking function is realized without influencing the normal production operation.

The invention provides a method for designing geometrical size of a coal cutter chain cutting part cutting tooth. The method comprises the following steps: step 1, determining the relation between cutting depth and cutting torque; steps 2, determining the relation between cutting tooth stress and the cutting depth; step 3, analyzing cutting force in a coal breaking process by the cutting tooth; step 4, determining the contact relation between cutting tooth and a coal wall; step 5, calculating the contact area between single cutting tooth and the coal wall in a cutting process; step 6, determining the relation between the cutting tooth contact area and the cutting depth; step 7, calculating the diameter of the cutting tooth body. The cutting force applied to unit size stressed surface of the cutting tooth in a cutting process tends to be equal, so that abrasion of the cutting force is more uniform, the adaptability of the cutting tooth is enhanced, the cutting efficiency of the cutting tooth is improved, the service life is prolonged, the reliability of a coal cutter is improved, a better economic benefit is obtained, and meanwhile, the coal loading effect of a cutting part can be improved.

The invention relates to the technical field of coal production, in particular to a coal cutter drum, a spiral blade for the same and a coal cutter. The spiral blade comprises a first blade and a second blade which are sequentially connected from one end close to a working face to one end away from the working face, and spiral lead angle of the first blade is smaller than that of the second blade.The spiral lead angle of the first blade in the spiral blade is small than that of the second blade, the first blade can increase cutting tooth capacity, and the drum is stressed uniformly in the process of cutting, thereby being little in fluctuation and conducive to cutting; the second blade increases coal containing space, friction between coal and the blades is reduced, and coal throwing speed is increased, so that coal loading capacity of the drum is improved, manual labor is reduced, and coal mining efficiency is improved.

An adjustable coal shoveling plate used in the cutting part of a coal shearer is characterized in that it includes a rocker arm and a coal shoveling plate mechanism; the coal shoveling plate mechanism includes a coal shoveling plate, a fixed plate, a set of lifting hydraulic cylinders and a set of The tilt adjustment hydraulic cylinder, the fixed plate and the rocker arm are connected by a ball hinge; the lifting hydraulic cylinder is placed in the installation groove on the fixed plate, one end is fixed with the fixed plate by a pin, and the other end is hinged with the coal shoveling plate; one end of the tilt adjustment hydraulic cylinder It is hinged with the fixed plate, and the other end is hinged with the rocker arm; the coal shoveling plate and the fixed plate form a slide rail slider mechanism; the coal shoveling plate mechanism provided by the invention is easy to install, flexible in structure, and can be applied to any type of coal shearer The rocker arm is cut to realize the automatic cleaning of accumulated coal rocks, which avoids the obstruction caused by the accumulated coal rocks to the shearer, reduces the resistance when the scraper conveyor is pushed forward, and improves the coal loading of the shearer. Effect.

A large-mining-height fully-mechanized-face fast coal mining technology is suitable for large-mining-height fully-mechanized-face fast coal mining with a roof of a coal seam higher than medium hard level and firmness coefficient of the coal seam more than 1.0. Coal is first cut in the middle part of the coal seam, a front roller of a coal mining machine is then used for cutting top coal, a rear roller of the coal mining machine is used for cutting bottom coal, and simultaneously a hydraulic support of a coal cutting achieving part is moved, after the hydraulic support is moved, a face guard of the hydraulic support is opened to enable the face guard to be tightly attached to a coal wall. Every cycle operation goes on sequentially in a cycling mode according to the working procedures, the middle part of the coal seam is cut first, and the top coal at the upper part depends on the face guard to support so that wall caving of the coal wall and roof fall of the end face can be effectively prevented. Due to the fact that a coal cutting height is reduced, coal cutting speed is remarkably improved, and simultaneously coal of large sizes cannot be produced. Therefore, the large-mining-height fully-mechanized-face fast coal mining technology fundamentally resolves the problem that large-mining-height fully-mechanized-face large-sized coal hinders working-face coal cutting, coal charging and coal carrying, removes potential dangers of manually breaking large-sized coal, and is simple in technological operation, safe, reliable and high in efficiency.

The invention discloses a bottom-clearing roller coal mining machine. Each cutting part of the coal mining machine includes two cutting drums, the first cutting drum (a14) and the first cutting drum transmission chamber casing (a6 ) extends to the coal wall (15) through the transition section shell (a3), and the rear part of the first cutting drum drive chamber shell (a6) extends beyond the middle trough of the scraper conveyor and the trough side (10) of the transition trough , and at the same time the first cutting drum drive chamber casing (a6) bends downward. The first cutting drum of the present invention has enough undercover to avoid the formation of "triangular coal" at the head and tail of the scraper conveyor, and the second cutting drum has a smaller production distance to improve the coal loading effect and ensure sufficient load bearing Strength; at the same coal mining height, two cutting drums with smaller diameters are used in pairs to ensure the full height of one-time mining, prolong the service life of the cutting drum, optimize the overall performance of the cutting part, and have good adaptability to changes in coal seam thickness. Reduce cost and process requirements.