787results about "Cutting machines" patented technology

In one aspect of the present invention, a drill string has a drill bit with a body intermediate a shank and a working face. The working face has a plurality of blades converging at a center of the working surface and diverging towards a gauge of the working face. At least one blade has a cutting element with a carbide substrate bonded to a diamond working end with a pointed geometry. The diamond working end also has a central axis which intersects an apex of the pointed geometry. The axis is oriented between a 25 and 85 degree positive rake angle.

The invention discloses an efficient thin seam coaling roller for a coal mining machine and a using method, and relates to the field of coal mining equipment. A thin seam efficient coaling roller for a coal mining machine comprises a coal mining spiral roller which is fixedly installed at the power output end of a driving rocker arm of the coal mining machine through a fixing bolt; the mounting cover is fixedly mounted at the position, close to the coal mining spiral drum, of the coal mining machine driving rocker arm; while the coal mining spiral drum rotates to mine coal, water spraying at the rocker arm of the coal mining machine, water spraying at the cutting tooth seat and mist curtains sprayed by the wide-angle fan-shaped atomizing nozzles work cooperatively, the dust falling effect is enhanced, a water mist cover is rapidly formed under the assistance of the mounting cover, and the water mist cover can effectively isolate coal dust inside, so that the dust falling effect is improved. And the coal dust diffusion is greatly reduced, the body health of miners is guaranteed, the occupational health risk is reduced, the abrasion of the coal dust to equipment is reduced, the service life of the equipment is prolonged, the maintenance frequency and cost of the equipment are reduced, and the comprehensive benefits of coal mining operation are improved.

A two-track bucket wheel loader comprising a bucket wheel loader (1), wherein a boom conveyor (2) is fixedly mounted at one end of the bucket wheel loader (1), symmetrically movable connecting arms (16) are attached inside the boom conveyor (2), a bucket (3) is fixedly connected to the ends of the connecting arms (16), a support platform (8) is fixedly connected to the lower end of the bucket (3), support frames (5) are fixedly connected to both ends of the support platform (8), track wheels (4) are fixedly mounted on both sides of the lower ends of the support frames (5), a belt conveyor (7) is fixedly mounted on both sides of the lower end of the support platform (8), a scraper blade (6) is fixedly mounted at the lower end of the support platform (8), and a belt scale (9) is fixedly mounted inside the belt conveyor (7).

The vertical feeding coal mining machine comprises a rack, a traction part and a cutting assembly, the traction part is connected with the rack so as to be used for dragging the rack to move, the cutting assembly comprises a roller body and cutting teeth, the roller body comprises a cylinder body, an end disc and an end cover, the end disc is arranged on the cylinder body, and the cutting teeth are arranged on the end disc. The end disc is arranged on the outer circumferential wall of the roller body in a sleeving mode, the end disc and the first end of the roller body are arranged in a flush mode, the end cover is connected with the inner circumferential wall of the roller body, a groove is defined between the end cover and the roller body, the multiple cutting teeth are arranged in the circumferential direction of the center line of the roller body at intervals, and the cutting teeth are arranged in the groove. One part of the plurality of cutting teeth is connected with the end disc, and the other part of the plurality of cutting teeth is connected with the end cover. According to the vertical feeding coal mining machine, the arrangement positions of the cutting picks are optimized, the possibility of abrasion of the cutting picks is reduced, and the cutting efficiency is improved.

An integral frame-type machine body structure of a coal mining machine, and an integral frame-type intelligent coal mining machine. A structure in which an integral frame-type framework is welded to articulated frames is adopted, and the frame-type framework is configured to be of a transverse drawer-type structure, thereby achieving high interchangeability. The articulated frames are symmetrically distributed on a left side and a right side of the frame-type framework and are welded and connected to the frame-type framework; and a top plate (16) and a bottom plate (14) are fixedly arranged at an upper part and a lower part of the frame-type framework, respectively, external traction transverse plates (9) are fixedly arranged on the left side and the right side of the frame-type framework, and several intermediate vertical plates are fixedly arranged between the top plate (16) and the bottom plate (14), which are located an upper side and a lower side of the frame-type framework, to divide same, so as to obtain a plurality of cavities. The modularization rate of the coal mining machine is improved, thereby improving the interchangeability, facilitating underground maintenance and overhaul, and enhancing the matching adaptability; in addition, the force-bearing condition of the coal mining machine during the working process is improved, and the reliability of a transmission system of the coal mining machine is enhanced.

The double-coal-machine mining method comprises the following steps that S1, coal is cut at a first end through a first notch machine to form a first end notch, and coal is cut in the middle of a working face through a middle notch machine to form a second middle notch; s2, the first coal mining machine is controlled to enter the first end notch, and the second coal mining machine is controlled to move from the second end to the first end so as to enter the second middle notch; and S3, the first coal cutter and the second coal cutter both cut coal in the direction from the first end to the second end. According to the double-coal-machine mining method provided by the embodiment of the invention, the coal mining machine can enter the coal wall for normal mining without beveling feed, the process is simpler, and the coal cutting speed is higher, so that the mining efficiency and the propelling speed of a working face can be improved.

The invention discloses a high-pressure jet flow intelligent mining self-adaptive monitoring control system which comprises a jet flow rock breaking dynamic monitoring module, a rock mass analysis and data processing module, a neural network deep learning module and a mining machine controller. The jet flow rock breaking dynamic monitoring module is used for obtaining jet flow parameters, calculating jet flow axial reverse thrust, obtaining the three-dimensional shape of a mining face and obtaining cutting and crack shapes. Wherein the three-dimensional shape of the mining face at least comprises cutting depth information; the rock mass analysis and data processing module is used for acquiring three-dimensional coordinates of the mining machine in a working environment, calculating rock mass confining pressure and acquiring rock mass characteristics; the neural network deep learning module establishes a jet cutting process parameter and mining process parameter intelligent model; the mining machine controller is used for generating a mining machine control instruction. According to the invention, the high-pressure jet mining equipment can be safely and efficiently controlled to carry out self-adaptive cutting on the ore / rock mass.

The invention discloses a multi-cutting-device collaborative coal cutting non-beveling feed system which comprises a machine nest cutting device and a scraper conveyor, the machine nest cutting device comprises a traction part, a rotating arm and a cutting roller, the cutting roller is arranged at the first end of the rotating arm, and the scraper conveyor is arranged at the second end of the rotating arm. The second end of the rotating arm is pivotally connected with the traction part, the rotating arm is used for driving the cutting roller to move relative to the coal seam, the extending direction of the scraper conveyor is perpendicular to the advancing direction of the working face, the two ends of the scraper conveyor are each provided with a machine nest cutting device, and the traction part of each machine nest cutting device moves along the scraper conveyor; the drum shearer is arranged in the middle of the scraper conveyor and used for cutting a coal seam, and the hydraulic support is arranged on the side, away from the working face, of the scraper conveyor and used for supporting a top plate. The multi-cutting-device collaborative coal cutting non-beveling feed system provided by the invention has the advantages of high cutting efficiency and small influence on the original process.

The invention discloses a low seam few-person fully mechanized coal mining face mining system and method, the system comprises a coal mining machine automatic control system and a hydraulic support electrohydraulic control system, the coal mining machine automatic control system realizes position information transmission and height adjustment of a coal mining machine; the hydraulic support electro-hydraulic control system achieves hydraulic support pulling, pushing and sliding, machine following and support moving and automatic control over actions of the hydraulic support, and the remote control system conducts three-machine linkage control over key production equipment of the fully mechanized coal mining face, automatic control, locking, sudden stop, fault diagnosis, automatic liquid supplementing and data information transmission on the hydraulic support. Coal face equipment has the functions of coal wall video monitoring and the like, and the production process is automatically completed; the coal mining process is intelligent, data transmission is informationized, and on-site operators operate and produce with few persons, so that manual intervention is reduced as much as possible, and high-yield, efficient and safe production is ensured.

The invention provides a high-gas coal roadway rapid tunneling system and method, and the system comprises a spraying and drilling and anchoring integrated support tunneling and anchoring machine, an anchor rod reversed loader, a bridge type reversed loader, a self-moving tail and a gas extraction drill carriage, the spraying and drilling and anchoring integrated supporting digging and anchoring machine comprises a rack, a cutting part, a spraying mechanical arm, a drilling and anchoring integrated drilling arm, a telescopic sliding device, a spraying material box, an anchoring agent material box and digging-following gas monitoring equipment. By spraying and supporting the surface of the roadway, sealing of the surrounding rock surface of the roadway is achieved, the gas concentration increasing speed of the driving working face is slowed down, and meanwhile gas extraction operation in the tunneling process is dynamically carried out by monitoring the gas concentration of the driving working face. The supporting speed can be increased by adopting the drilling and anchoring integrated drilling arm.

The invention relates to the technical field of coal mine intellectualization, and provides an inter-face coal pillar digging and mining robot which comprises a right-angle turning scraper conveyor and a digging and mining robot body. The digging and mining robot is mounted on the right-angle turning scraper conveyor; the digging and mining robot comprises a cutting system, and the cutting system is located on a machine body of the digging and mining robot. Wherein the cutting system is driven by the electric cylinder to move, and vertical cutting of a rectangular section is completed through compound movement of the feeding electric cylinder and the height adjusting electric cylinder; after the cutting action is completed, a walking system of the digging and mining robot moves by one cut width along the right-angle turning scraper conveyor, and the actions are repeated until the whole section is pushed by one cut distance; wherein in the cutting process, the fallen coal is transferred into the right-angle turning scraper conveyor; the stability of the cutting system in the cutting and walking process is ensured through the anti-overturning effect of the guide sliding shoes in the walking system of the digging and mining robot and the force effect of the hydraulic support matched with the right-angle turning scraper conveyor.

The invention relates to the technical field of thin seam mining equipment, in particular to a thin seam mining machine which comprises a driving assembly, a transmission assembly, a machine body, a first cutting assembly and a second cutting assembly, and the first cutting assembly and the second cutting assembly are arranged on the two sides of the machine body in the extending direction. The driving assembly and the transmission assembly are arranged in the machine body, the driving assembly is arranged between the first cutting assembly and the second cutting assembly, the input end of the transmission assembly is connected with the output end of the driving assembly, and the first output end of the transmission assembly is connected with the input end of the first cutting assembly; and the second output end of the transmission assembly is connected with the input end of the second cutting assembly. According to the thin seam coal mining machine, the single motor is arranged to drive the rollers on the two sides, the size of the coal mining machine is reduced, and the coal mining flexibility is improved.

The present invention discloses a device and method for breaking coal, relieving pressure and increasing permeability by using a pneumatic flexible tool in a soft coal seam, which comprises: a drilling rig, in which a drill rod is installed, and the shaft of the drill rod is provided with an air flow cavity of a columnar structure, and the outer ring wall of the top end of the drill rod at the outermost end is provided with a partial thread; an air compressor pump, the output end of which is sealed and connected to the air flow cavity through a high-pressure air pipe; pneumatic slitting equipment, which comprises a pneumatic rotating device and a slitting device, the left end of the pneumatic rotating device is installed on the top end of the drill rod at the outermost end, and the right end of the pneumatic rotating device is installed with the slitting device, and the drill rod, the pneumatic rotating device and the slitting device are all coaxially arranged.

A mixed feed efficient mining method includes the steps that firstly, an air way, a machine way and a cutting hole are formed, a coal pillar is reserved at the left end of a working face, the length of the reserved coal pillar is larger than that of a single-drum coal mining machine, a machine nest is formed in the right side of the reserved coal pillar, and the length of the machine nest is not smaller than the sum of the length of a double-drum coal mining machine and the length of beveling feed; the single-drum coal mining machines are arranged in the roadways at the two ends of the fully mechanized coal mining face, the double-drum coal mining machines are arranged on the scraper conveyor at the machine nest section, when the double-drum coal mining machines run to be close to the left end or the right end of the fully mechanized coal mining face, reverse beveling feeding is directly carried out for next coal cutting, and it is not needed that coal is cut back and forth after conventional beveling feeding is carried out; coal pillars left at the two ends of the working face are cut by the two-end single-drum coal mining machine through vertical feeding, coal mining at the two ends and the middle section of the working face is achieved at the same time, the mining efficiency is greatly improved, the number of arranged working faces is reduced, the labor time of workers is shortened, and the economic benefits of enterprises are increased.

The utility model belongs to the technical field of cutting arms, and particularly relates to an impact-resistant cutting arm for a hard rock heading machine. Comprising a cantilever cylinder; the cutting main shaft is installed in the cantilever cylinder, a self-aligning roller bearing, a thrust bearing and a cylindrical roller bearing are sequentially arranged between the cutting main shaft and the cantilever cylinder from front to back, a framework oil seal II is arranged behind the cylindrical roller bearing, and a framework oil seal I is arranged in front of the self-aligning roller bearing; the front end of the cantilever cylinder is provided with a floating sealing frame sleeved on the cutting main shaft, the front end of the floating sealing frame is provided with a floating sealing seat sleeved on the cutting main shaft, the floating sealing seat is provided with a mechanical labyrinth seal, and a floating seal is arranged between the floating sealing frame and the floating sealing seat; and the cutting head is fixed at the front end of the cutting main shaft. When the cutting arm of the hard rock heading machine is used for cutting rocks of which the compressive strength is more than 70MPa, the service life of the cutting arm is prolonged.

The utility model discloses a coal cutting pick for coal mining in the technical field of coal mining, which comprises a base of the coal cutting pick and a digging tooth sleeved on the outer side of the base, one end of the base is provided with a fixing groove, one end of the digging tooth is provided with a placing groove, the inner side of the placing groove is connected with a fixing block, and the fixing block is connected with the digging tooth. Locking pieces are installed between the digging teeth and the base, a fixing part is connected to the outer side, close to one end, of the base, one end of the base is inserted into a containing groove in one side of the digging teeth, meanwhile, a fixing block on the inner side of the containing groove is inserted into a fixing groove in one side of the base, and a gasket can be located between the fixing block and the fixing groove. By means of the technical scheme, the spacer can conduct anti-collision and anti-abrasion protection on the fixing block, the base and the digging teeth are spliced and installed again through the locking piece, and the problems that the stability of splicing installation of the cutting tooth head and the cutting tooth base is low, consequently, the cutting tooth head and the cutting tooth base shake or disengage, and disassembly and replacement operation of the cutting tooth head and the cutting tooth base are strenuous are solved.

The invention provides a spraying and drilling and anchoring integrated tunneling device which comprises a cantilever type tunneling machine, a moving assembly, a drilling and anchoring integrated drill arm, a spraying mechanical arm and a control assembly, the cantilever type tunneling machine comprises a rack, a crawler belt assembly is connected with the rack, and a sliding large arm part can move relative to the rack; the adjusting arm is connected with the sliding large arm and can move relative to the sliding large arm, the drilling and anchoring integrated drilling arm is connected with the adjusting arm and can move relative to the adjusting arm, the drilling and anchoring integrated drilling arm is used for anchoring the wall face of a roadway, and the spraying mechanical arm is connected with the adjusting arm and used for spraying supporting materials to the wall face of the roadway. The control assembly is used for coordinating the movement time sequence of the moving and drilling and anchoring integrated drilling arm and the spraying mechanical arm. According to the drilling and anchoring integrated anchor rod parallel operation tunneling device, tunneling, spraying and drilling and anchoring procedures are carried out on a roadway through cooperative movement and adjustment of a plurality of components, repeated transposition of tunneling and supporting is avoided, and the tunneling efficiency is improved.

A three-coal-mining-machine efficient mining method includes the steps that firstly, an air way, a machine way and a cut hole are formed, notches are formed in the two ends of the cut hole in advance, and the length of the notches is not smaller than the sum of the length of a single-drum coal mining machine and the length of a double-drum coal mining machine; the front portions of the two ends of the working face are beveled, fed and pre-cut to form machine nests through the two single-drum coal mining machines, a roof is supported through the lagging supporting support and the timely supporting support, and the requirement for the width of a roadway can be lowered by adopting the beveled feeding mode of the single-drum coal mining machines; in addition, the single-drum coal mining machines on the two sides perform pre-cutting operation at the two ends of the working face and the double-drum coal mining machine perform coal cutting operation in the middle of the working face synchronously, and after the double-drum coal mining machine enters a left-end or right-end machine nest, the double-drum coal mining machine directly performs reverse beveling feeding for next coal cutting, so that the mining efficiency of the working face is improved; the working face arrangement number is reduced, the labor time of workers is shortened, and the economic benefits of enterprises are increased.

The invention discloses a coal cutter roller control device and method integrating elastic wave and infrared temperature measurement, and relates to the technical field of safe mining of deep mine coal, and the coal cutter roller control device integrating elastic wave and infrared temperature measurement mainly comprises an elastic wave detection module and an infrared monitoring module. The elastic wave detection module is used for detecting a coal seam thickness value and a coal-rock interface layer position and controlling a roller of the coal mining machine to rise and fall; the infrared monitoring module is used for collecting temperature data and obtaining and storing a temperature threshold value. The coal mining machine roller control device integrating elastic wave and infrared temperature measurement and the control method can adapt to complex construction environments and severe geological conditions, and the safety and efficiency of deep mine coal mining are improved.

The invention discloses a radial oscillation cutting mechanism. The core structure of the device is composed of a transmission shaft, an eccentric block, an eccentric jumping wheel, an oscillation cutting disc base, an oscillation cutting disc and the like. In the operation process, the motor serves as a power source to drive the shaft to rotate, the shaft rotates to drive the eccentric block to rotate along with the shaft, and then the two eccentric jumping wheels arranged in the 180-degree phase difference mode are promoted to start to move. The two eccentric jumping wheels are matched with the pin in a cam mode, so that the two eccentric jumping wheels move along a unique curve track. Due to the fact that the base of the oscillation cutting disc is tightly and fixedly connected with one eccentric jumping wheel, the unique movement transmission mechanism is achieved, then the oscillation cutting disc is successfully driven to execute hard rock cutting operation, and a solution which is extremely innovative and efficient is provided for hard rock cutting engineering.

The utility model provides a heading machine. The heading machine comprises a machine body; the first rotating part is arranged at the front end of the machine body; the cutting assembly is connected with the first rotating part and can swing up and down under the action of the first rotating part; the first detection assembly is connected with the first rotating part and is used for detecting the lifting amplitude of the cutting assembly; the control assembly is connected with the first detection assembly and used for determining the final lifting amplitude of the cutting assembly according to the detection result of the first detection assembly; wherein the first detection assembly comprises a first gear which is connected with the first rotating part and can synchronously rotate along with the first rotating part; the second gear is meshed with the first gear; the first angle sensor is connected with the second gear and used for converting the rotation angle of the second gear into an electric signal and sending the electric signal to the control assembly. The heading machine can stably measure the lifting amplitude of the cutting assembly of the heading machine with high precision.

A non-beveling feed mining method specifically comprises the following steps that (1) auxiliary working faces are arranged at the two ends of a main working face in advance, and single-drum coal mining machines, auxiliary scraper conveyors and hydraulic supports are arranged on the auxiliary working faces; (2) pre-opening pits of the secondary working surfaces at the two ends and normal pushing and mining of the main working surface are performed simultaneously; wherein the single-drum coal mining machine starts a pit on the auxiliary working face, and a hydraulic support of the auxiliary working face follows a pulling frame and is pushed to slide; the double-drum coal mining machine cuts coal on the main working face, the hydraulic support of the main working face follows the pulling frame and is pushed to slide, and when the double-drum coal mining machine runs to enter the machine nests in the two ends, the double-drum coal mining machine returns a cutter and directly and vertically feeds the cutter to cut the coal wall to achieve pushing mining of the main working face. The method does not need conventional beveling feeding and then back-and-forth coal cutting, realizes simultaneous operation of pre-opening machine nests at the two ends of the fully mechanized coal mining face and normal pushing mining of the middle section, greatly improves mining efficiency, is beneficial to reducing the arrangement number of the working faces, reduces the labor time of workers, and increases the economic benefits of enterprises.

The coal mining machine roller comprises a roller body and a cutting tooth assembly, the roller body comprises a cylinder body, an end disc and an end cover, the end disc is arranged on the peripheral wall of the cylinder body in a sleeving mode, the end disc is flush with the first end of the cylinder body, the end cover is connected with the inner peripheral wall of the cylinder body, the cutting tooth assembly is arranged on the inner peripheral wall of the cylinder body, and the cutting tooth assembly is arranged on the inner peripheral wall of the cylinder body. A groove is defined between the end cover and the roller body, the cutting tooth assembly comprises a plurality of cutting teeth, the plurality of cutting teeth are arranged at intervals in the circumferential direction of the center line of the roller body, one part of the plurality of cutting teeth is connected with the end disc, and the other part of the plurality of cutting teeth is connected with the end cover. According to the roller of the coal mining machine, the arrangement positions of the cutting picks are optimized, the possibility of abrasion of the cutting picks is reduced, and the cutting efficiency is improved.

The invention discloses an impacting-splitting-cutting composite rock breaking configuration of a cantilever type heading machine, relates to the field of coal mine underground heading equipment, and solves the problems of low efficiency, serious cutting pick abrasion, poor stability and insufficient adaptability of an existing heading machine during hard rock operation. A multi-stage cylinder executing mechanism is arranged on a cutting arm of the heading machine, an angle adjusting rotary table is arranged at the upper end of the multi-stage cylinder executing mechanism, and a breaking hammer and a rock cracking machine are arranged on the angle adjusting rotary table; the angle adjusting rotary table comprises a track plate and a rotary table, and the rotary table drives the track plate to rotate; a breaking hammer is arranged at one end of the track plate, and a rock cracking machine is arranged at the other end. The breaking hammer and the rock cracking machine are integrated at the front end of the heading machine, pre-broken rock can be split, the number of times of breaking is reduced, vibration and noise caused by repeated breaking are avoided, the internal stress of a rock stratum is damaged by additionally arranging the rock cracking machine, other work of the whole machine is not affected, and the service life of the heading machine is not affected.

The invention discloses a magnetic water jet in-hole grooving device and a using method thereof. The magnetic water jet hole inner grooving device comprises a liquid storage tank, a water suction pump, a booster pump, a liquid conveying pipe, a liquid storage pipe handle, an outer sleeve hoop, a limiting plate clamping groove, a tooth-shaped clamping groove, an outer supporting rod, a top resistance plate, two side resistance plates, an outer sleeve, a liquid storage pipe, a limiting plate, a movable lantern ring, a right anti-rotation device hoop, a limiting rod, a liquid inlet, a left anti-rotation device hoop and a magnetic nozzle. The electrolyte NaCl and the high-molecular polymer polyvinyl alcohol are added into the aqueous solution of the liquid storage tank, and meanwhile, the hooping effect of induced current generated by a magnetic field in the solution on jet flow is combined, so that the related problems that a grooving device is prone to abrasion, the jet flow is prone to cavitation, the cutting capacity and precision are not high, and equipment is heavy can be remarkably solved.

The present application provides a kind of slotted equipment for coal seam gas control, belong to coal seam gas control technical field, including two slotted mainframes of synchronous coordination work, two slotted mainframes are arranged in the roadway of coal seam two sides respectively, and two slotted mainframes are driven connection through annular cutting cable between two slotted mainframes;Slotted mainframe includes self-propelled platform, power module, speed reducer, gear reversing device and main drive line wheel are set in self-propelled platform upper portion, power module passes through speed reducer and transmits power to gear reversing device;The present application uses annular cutting cable of cyclic motion as cutting force, and combines the feeding force provided by two slotted mainframes of synchronous coordination work, can cut out one or two slotted in coal seam transversely, instead of traditional high-density drilling, not only greatly reduces labor intensity, saves cost, and the permeability area formed by slotted is larger, more conducive to the desorption of gas, to greatly improve gas extraction efficiency.

The invention relates to a hydraulic slotting and fracturing integrated collaborative operation system, and belongs to the technical field of coal mining. The system comprises a multi-parameter three-dimensional monitoring module, a multi-mode cooperative control module, a hydraulic fracturing module and a hydraulic slotting module. The multi-parameter three-dimensional monitoring module is used for carrying out crack three-dimensional modeling, stress field dynamic tracking and gas component real-time analysis; the multi-mode cooperative control module analyzes the geological exploration data output by the multi-parameter three-dimensional monitoring module to obtain geological parameters, and generates an operation scheme according to the geological parameters; and the hydraulic fracturing module and the hydraulic slotting module cooperatively work under the control of the multi-mode cooperative control module. Through the integrated collaborative design of hydraulic slotting and fracturing, the limitation of a single process is broken through, the construction efficiency and uniformity of a crack network are improved, the stability and coverage range of a gas extraction channel are improved, and a full-process intelligent solution is provided for safe and efficient mining of a complex coal seam.

A tensile-fracturing hard-rock-breaking boring machine and a construction method. The boring machine comprises: a cutting motor (a1) and a speed reducer (a3); a cutting telescopic oil cylinder (a2), which extends out so as to realize cutting feed and is fixed to the cutting motor (a1), an output end thereof being hinged to a telescopic outer cylinder (b24) of a telescopic part (a4); a telescopic part (a4), which is located between cutting heads and the cutting telescopic oil cylinder (a2), and comprises a driving spiral bevel gear (b20) used for transmission of power from the speed reducer and fixed to the tail end of a transmission shaft (b21); and a middle fixing box (a8), which comprises a middle fixing box body (b16), a speed reduction shaft (b19), a small speed reduction gear (b17), a large spiral bevel gear (b18), a cutting shaft (b8), a large speed reduction gear (b7), a left fixed spiral bevel gear (b13), a left bearing pedestal (b14), a right fixed spiral bevel gear (b5) and a right bearing pedestal (b6). The cutting heads perform accelerated self-rotation while revolving downward towards a front wall along with cutting box bodies. The self-rotation and revolution of a left cutting head and a right cutting head are coordinated to enable smooth cutting, and the total width of the left cutting head and the right cutting head is reduced without affecting normal full-face tunneling.

The utility model discloses a spiral cutting head, which relates to the technical field of mining equipment, and comprises a cutting head, a cutting arm is sleeved in the rear end of the cutting head, a cutting main shaft is rotatably arranged in the cutting arm, the front end of the cutting head is detachably connected with the cutting main shaft, and the front end of the cutting head is detachably connected with the cutting main shaft. A floating sealing assembly is detachably arranged between the cutting arm and the cutting main shaft, an inner spiral guide groove is formed in the rear end of the cutting head, and an outer spiral guide groove is formed in the outer side of the cutting head; the inner spiral material guide groove is formed in the rear end of the cutting head, the inner spiral material guide groove continuously guides out materials between the cutting head and the cutting arm and turns over the materials, so that the materials are kept loose, the floating sealing assembly is prevented from being extruded, the service life of the sealing assembly is prolonged, the outer spiral material guide groove guides out materials on the outer side of the spiral head, and meanwhile, the service life of the sealing assembly is prolonged. The graphite packing can be prevented from being installed and manufactured on site, the on-site use and maintenance frequency is reduced, and installation and maintenance become simple and efficient.

Disclosed are a shearer having an adaptive variable cutting line distance and a cutting method for the shearer. The shearer comprises a box (1), a traveling mechanism (2), a pitch mechanism (3), a longitudinal moving mechanism (5), a cantilever, and cutting mechanisms (7). By means of the traction of a longitudinal moving mechanism, a cantilever of the shearer drives a drum cutting head to perform a longitudinal reciprocating cutting motion, thereby improving the cutting range and efficiency; moreover, by regulating the longitudinal movement speed of the cutting head, the cutting line distance of the shearer can be significantly decreased, the problem of insufficient cutting capacity caused by a small cutting thickness during coal rock cutting is solved, and the risk of failure and damage of mechanisms is reduced; by means of the arrangement of sensors, coal rock can be classified into normal-hardness coal rock, high-hardness coal rock, and ultra-high-hardness coal rock on the basis of load conditions; and when the hardness is relatively high, the cutting thickness and the cutting line distance can be decreased so as to improve the cutting capacity, and when the hardness is relatively low, the cutting thickness and the cutting line distance can be appropriately increased so as to increase the cutting speed, so that the shearer can adapt to relatively complex working conditions, thereby achieving high-quality and high-efficiency cutting.