Shearer for fully-mechanized mining face in extremely thick coal seam

Abstract

The present invention relates to a shearer for fully mechanized coal mining face in extra-thick coal seams, which comprises an electric control box, two traction units on the left and right, two cutting units on the left and right, two drums on the left and right, two support legs on the left and right, and two walking boxes on the left and right. The two traction units on the left and right are fixed on the left and right sides of the electric control box to form the fuselage. The traction housing of the traction unit is a fully welded structure made of high-strength plates. The support legs adopt a welded structure. The traction units on the left and right are butt-jointed with the electric control box on the left and right. Both of them are simultaneously engaged with a plurality of large round cake pins through pin holes, and are fastened distributively by multiple groups of long and short screws between the traction unit and the electric control box. The cutting unit comprises a transition frame and a rocker arm which are longitudinally butt-jointed and detachably and fixedly connected. The length of the cutting unit is controlled within 4000mm - 4500mm. The present invention can achieve full-height mining in one pass for extra-thick coal seams, and the equipment itself has good overall stability, moderate weight, good economy, and is suitable for traditional mining processes.

Description

Technical Field

[0001] The present invention relates to a shearer for extra-thick coal seams, belonging to the technical field of coal mining equipment. Background Art

[0002] With the development of mine equipment technology, shearers are increasingly developing towards large mining height and high power. The installed power of shearers at home and abroad has reached about 3000 kW at most, and the mining height has reached 7 m. The reserves of extra-thick coal seams above 7 m in China are huge, especially in the Shaanxi and Inner Mongolia regions. The mining problems of extra-thick coal seams with a thickness of 7 - 9 m have gradually been put on the agenda, and the annual output requirement is 10 Mt to 15 Mt. Since the stratified mining efficiency is low and the top coal caving mining is likely to cause resource waste, the full-height one-pass mining of extra-thick coal seams has become the best solution, which has the advantages of high production efficiency, high resource recovery rate, and convenient maintenance and management.

[0003] Currently, for the full-height one-pass mining of a fully mechanized mining face with an extra-thick coal seam of 9 m, a multi-drum form is preferred.

[0004] Chinese Patent Application No. 201610575811.3 discloses a shearer with three drums for extra-thick coal seams and its cutting method, which uses three drums to cut the upper, middle, and lower layers of the coal wall simultaneously. Specifically, the front cutting part of the shearer cuts the middle layer of coal, the middle cutting part cuts the upper layer of coal, and the rear cutting part cuts the lower layer of coal and loads the coal, so as to disperse the cutting load, achieve the purpose of reducing the cutting power of the shearer and the cutting load of a single rocker arm, and provide a feasible cutting equipment and method for the full-height one-pass mining of extra-thick coal seams above 8 m. Its disadvantages are that the body height is too large and it is not suitable for the lowest coal seams; there are many types of shearer components, the interchangeability is poor, and the economy is not good; at the same time, since the three rocker arms and drums are all arranged on the coal wall side, the overall center of gravity of the machine is high and biased towards the coal wall side, resulting in poor overall stability of the machine.

[0005] Chinese Patent Application No. 201210033401.8 discloses a superimposed-arm three-drum large mining height shearer, which superimposes a roadheader-type cutting part in the middle of the body of a double-drum shearer, and adjusts its lifting and horizontal swing through hydraulic cylinders and a slewing platform to complete the cutting of the upper coal seam. The mining process of this invention is extremely complex, and it is difficult to match the efficiency of the roadheader-type cutting method and the shearer cutting method, resulting in low production efficiency and it is difficult to adapt to the mining of extra-thick coal seams.

[0006] The Chinese patent application with the application number 201410319059.7 discloses a three-drum shearer applicable to 7-10 m thick coal seams and a mining method. It uses a three-drum shearer for mining. The two ends of the shearer are connected to small-diameter drums through long rocker arms to mainly cut the upper and lower coal seams, and the middle short rocker arm with a large-diameter drum cuts the middle coal seam, providing a relatively feasible mining method for 7-10 m thick coal seams. However, there are also several problems with this solution: First, since the middle part has a short rocker arm with a large-diameter drum and the rocker arms at both ends are too long, if a coal seam thicker than 9 m is to be mined, the rocker arm length at both ends needs to be at least about 6 m. The long rocker arms will result in huge forces on the rocker arms, poor stability, poor compatibility, and problems such as interference with the support canopy. At the same time, the long rocker arms increase the distance of oblique cutting for feed, reduce the production efficiency, and pose a great challenge to the traveling part. Second, adding a short rocker arm and a large-diameter drum in the middle of the fuselage increases the load of the fuselage and reduces the effective traction capacity of the whole machine. Third, a large amount of coal cut by the middle drum cannot be loaded into the chute and will accumulate on the fuselage, causing extrusion to the shearer and drift of the chute.

[0007] The Chinese patent application with the application number 201520306479.1 discloses a four-drum shearer. Its lower coal-cutting drums cut coal simultaneously in a high-low arrangement in the vertical direction, and one of the upper coal-cutting drums works according to the traveling direction of the shearer. Its essence is that three drums work simultaneously. Its disadvantages are that the weight of the whole machine increases significantly, adding a rocker arm compared with the shearer disclosed in the patent application with the application number 201410319059.7, the weight of the whole machine increases significantly, the traction performance of the shearer is worse, and the center of gravity of the whole machine seriously deviates towards the coal wall side, resulting in poor stability of the whole machine and easy damage to the traction traveling system; in addition, with the four-drum shearer solution, it is difficult to develop the whole machine in series, the economy of the whole machine is low, and the adaptability to coal seam thickness is poor. Summary of the Invention

[0008] The object of the present invention is to provide a shearer for fully-mechanized mining face of extra-thick coal seams, which can not only achieve full-height mining of extra-thick coal seams at one time, but also has the characteristics of good stability of the whole machine, moderate weight of the whole machine, and no increase in the difficulty of mining technology.

[0009] The main technical solutions of the present invention are as follows:

[0010] A shearer for fully mechanized mining face in extra-thick coal seams, comprising an electric control box, two traction units on the left and right, two cutting units on the left and right, two drums on the left and right, two support legs on the left and right, and two walking boxes on the left and right. The two traction units on the left and right are fixed on the left and right sides of the electric control box, and the three of them form the main part of the fuselage. The two traction units on the left and right are respectively fixed and supported on the two support legs on the left and right. The two cutting units on the left and right are respectively supported and connected to the two traction units on the left and right through a lifting cylinder, and the corresponding cutting unit, lifting cylinder and traction unit form a guide rod mechanism. The free ends of the two cutting units on the left and right are respectively installed with the two drums on the left and right. The goaf sides of the left traction unit and the right traction unit are respectively fixed to the two walking boxes on the left and right. The traction unit includes a traction housing and a gear transmission system located inside the traction housing. The traction housing is a fully welded structure made of high-strength plates.

[0011] The cutting unit includes a transition frame and a rocker arm. The transition frame is longitudinally butted with the rocker arm and detachably and fixedly connected. The transition frame and the rocker arm are simultaneously engaged with a set of pins on the butting surface to achieve lateral positioning.

[0012] The traction unit and the electric control box are butted left and right. At the joint, the two are simultaneously engaged with multiple large round cake pins for pin hole matching. The three of the left and right traction units and the electric control box are distributed and fastened by multiple long screw rods running through left and right. The two-by-two joints of the electric control box and the left and right traction units are distributed and fastened by multiple short screw rods.

[0013] One end of the cylinder barrel of the lifting cylinder is hinged to the top of the corresponding traction unit near the coal wall side, and the cylinder rod of the lifting cylinder is hinged to the corresponding cutting unit.

[0014] A coal accumulation prevention structure is provided at the top of the traction housing below the swinging position of the lifting cylinder. The coal accumulation prevention structure is an inclined surface located at the top of the traction housing, and the part of the inclined surface closer to the coal wall side is lower.

[0015] The outer surface of the bottom of the traction housing near the coal wall side is provided with a rectangular groove structure with side walls on all four sides. The top of the support leg is upwardly and conformally embedded in each of the rectangular grooves and is fixedly connected to the corresponding traction housing through a transverse pin shaft.

[0016] The traction housing of the right traction part is preferably provided with a top plate, a bottom plate, a left side plate, a first rocker connecting plate, a second rocker connecting plate, a third rocker connecting plate, a fourth rocker connecting plate and several right side plates. The first rocker connecting plate and the fourth rocker connecting plate respectively serve as the rear side plate and the front side plate and are fixedly connected to the top plate, the bottom plate and the left side plate. The first to fourth rocker connecting plates are arranged in sequence and are parallel and spaced apart. Between the top plate and the bottom plate at each interval is hermetically connected by one of the right side plates. The first to fourth rocker connecting plates all extend rightward beyond the right side plate, and the rightward extending part forms a mounting seat for the right cutting part. Two upwardly extending oil cylinder connecting plates parallel to the front side plate are fixed to the left front part of the top plate, forming an oil cylinder connecting seat for the height adjustment oil cylinder corresponding to the right cutting part. The upper and lower edges of some or all of the first, second, third and fourth rocker connecting plates are respectively inserted into slots provided on the top plate and the bottom plate and opening at the right edge and extending left and right. The traction housing structures of the left and right traction parts are symmetric about the left and right.

[0017] The lower parts of the two oil cylinder connecting plates are vertically inserted a certain distance below the top plate and are welded together by a rib plate. The oil cylinder connecting plates are welded and fixed to the top plate. The lower part of the oil cylinder connecting plate closer to the front side is in contact with and welded to the fourth rocker connecting plate.

[0018] The electric control box extends left and right and is internally provided with a wiring cavity and an electrical component installation cavity. The wiring cavity is located above the electrical component installation cavity and close to the coal wall side, so that the cross-sectional outer contour of the electric control box is in an L shape. The main cable of the shearer is arranged at the notch of the outer L-shaped structure of the electric control box.

[0019] The gear transmission system of the traveling box adopts large-module carburized gears on the tooth surface, with the module ≥ 30. The guiding sliding shoes of the traveling box are externally mounted on the outer side of the lower part of the housing of the traveling box.

[0020] The beneficial effects of the present invention are:

[0021] Through weight reduction and optimization measures such as structural optimization and dimension control, for example, the traction housing adopts a full-welded structure, the weight of the cutting part is controlled within 28t - 34t, the weight of the drum is controlled within 17t; the support legs adopt welded parts; the outer shape of the electric control box adopts an L-shaped structure, the cables, water pipes and oil pipes of the shearer are arranged along the top of the fuselage, and the length dimensions of the three sections of the fuselage are controlled within 9400mm, etc., the weight of the fuselage is greatly reduced, and the weight of the whole machine is controlled within 200t - 230t, so that while the mining height is greatly increased, it does not accompany a large increase in the weight of the shearer, making the weight of the whole machine lighter than that of the existing extra-thick coal seam multi-drum shearer and improving the traction-weight ratio of the whole machine.

[0022] Compared with existing multi-drum or multi-boom coal shearers, in the present invention, due to the reduction in the number of booms and the weight of the cutting part being restricted to a relatively low value within a small range, its center of gravity is more biased towards the goaf side, significantly increasing the overall stability of the machine and improving the stability and reliability during the operation of the coal shearer.

[0023] Through a series of structural optimization designs, for example, in the present invention, in addition to using large round cake pins to prevent shear between the three sections of the fuselage, a distributed fastening method combining long and short screws is also adopted to improve the ability of the fuselage to withstand the reaction force of drum coal cutting; the traction housing is made by full welding with high-strength plates, reducing the weight and increasing the traction weight ratio, avoiding inevitable casting defects caused by the complex structure of the traction housing; the lifting cylinder is installed at the top of the traction housing near the coal wall side. Compared with other positions at the top of the traction housing, the cutting reaction force received by the cutting part and the reaction force from the lifting cylinder are closer in the direction perpendicular to the coal wall. Therefore, the torsional moment received by the cutting part is smaller, and thus the torsional tendency of the cutting part can be better suppressed. On the other hand, compared with installing the lifting cylinder at the bottom of the coal wall side of the traction housing, the large chamber of the lifting cylinder is under pressure, which can withstand a greater cutting reaction force, and the swing angle of the lifting cylinder is small, the force on the cylinder is more stable, and the reliability is higher; an anti-coal accumulation structure is set to prevent coal blocks from accumulating between the traction part and the lifting cylinder when the lifting cylinder swings, resulting in the cylinder rod being squeezed and bent or even broken, etc., greatly improving the reliability and working stability of the three sections of the fuselage, vulnerable components, and even the entire coal shearer; the traveling box uses large-module carburized gears on the tooth surface to increase the traction bearing capacity of the coal shearer.

[0024] The present invention still maintains the overall scheme of a coal shearer with double large drums and double long cutting parts. The mine can continue to adopt traditional and mature fully mechanized coal mining face mining technology without affecting the coal loading effect, meeting the high-yield and high-efficiency requirements of an annual output of more than 10 Mt in the mine, being conducive to the series promotion of coal shearers, and having strong adaptability. In addition, for the procurement of the mine, when the coal shearer finishes mining one working face and is replaced to a working face with a different coal seam thickness, the coal shearer of the present invention is still applicable. Therefore, the present invention has the best economy, component interchangeability, and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1-1 is a schematic structural diagram of an embodiment of the present invention.

[0026] Figure 1-2 is Figure 1-1 the top view of

[0027] Figure 2 is a schematic structural diagram of an embodiment of the left cutting part of the present invention.

[0028] Figure 3 is a schematic diagram of the anti-coal accumulation structure of the present invention.

[0029] Figure 4 Schematic diagram of the structure of an embodiment of the rectangular groove on the bottom surface of the traction part of the present invention.

[0030] Figure 5 Schematic diagram of an embodiment of the connection structure between the traction housing and the support leg of the present invention;

[0031] Figure 6 Top view structure diagram of the right traction housing;

[0032] Figure 7 Schematic diagram of the connection structure of the oil cylinder connecting plate.

[0033] Figure 8 Schematic diagram of the cross-sectional outer contour of the electric control box.

[0034] Figure 9 Schematic diagram of the structure of an embodiment of the traveling box. Description of the drawings:

[0036] 1. Left drum; 2. Left cutting part; 3. Left traction part; 4. Electric control box; 5, Right traction part; 6. Right cutting part; 7. Right drum; 8. Boom cylinder; 81. Cylinder barrel; 82. Cylinder rod; 9. Traveling box; 10. Support leg; 11. Pin shaft;

[0037] 21. Boom; 22. Transition frame; 2-1. Motor; 2-2. Nine groups of spur gears; 2-3. Two-stage planetary mechanism;

[0038] 51. Roof plate; 52. First rocker arm connecting plate; 53. Second rocker arm connecting plate; 54. Third rocker arm connecting plate; 55. Fourth rocker arm connecting plate; 56. Right side plate; 57. Oil cylinder connecting plate; 58. Rib plate;

[0039] 91. Gear; 92. Traveling box housing; 93. Guide sliding shoe; 94. Traveling wheel shaft;

[0040] A. Inclined plane; B. Rectangular groove. Detailed implementation manners

[0041] The present invention discloses a shearer for fully mechanized coal mining face in extra-thick coal seams (which can be simply referred to as shearer), such as Figure 1-1 , 1-2As shown in the figure, it includes an electric control box 4, left and right traction parts 3 and 5, left and right cutting parts 2 and 6, left and right drums 1 and 7, left and right support legs 10 and left and right traveling boxes 9. The left and right traction parts are fixed on the left and right sides of the electric control box, and the three form the main part of the fuselage, which is called the three-section fuselage. The left and right traction parts are respectively fixed and supported on the left and right support legs. The left and right cutting parts are respectively supported and connected to the left and right traction parts through a lifting oil cylinder 8. The corresponding cutting part, lifting oil cylinder and traction part form a guide rod mechanism, and the cutting part can swing under the driving of the telescopic movement of the corresponding lifting oil cylinder. The free ends of the left and right cutting parts are respectively installed with the left and right drums. The left and right cutting parts are responsible for outputting power and cutting and loading coal through the corresponding drums. The goaf sides of the left traction part and the right traction part are respectively fixed to the left and right traveling boxes and supported on the corresponding traveling boxes. The traction part includes a traction housing and a gear transmission system located in the traction housing, and the traction housing is a fully welded structure made of high-strength plates. The gear transmission system can adopt a reduction transmission mechanism with two-stage spur gears plus two-stage planetary mechanisms.

[0042] The traction housing adopts a fully welded structure made of high-strength plates. First, it significantly reduces the total weight of the traction part, reducing the weight by about 2t compared with the traditional casting, meeting the requirements of reducing the weight of the whole shearer for extra-thick coal seams, and improving the traction-weight ratio of the whole machine. Second, by completely replacing all the casting forms in the traditional traction housing, it cuts off the cost of the wooden mold in the casting process, shortens the production cycle, and completely avoids quality defects such as casting cracks or sand holes caused by the structural complexity of the traction housing, improving the quality reliability.

[0043] The gear transmission system in the traction housing is arranged as close as possible to the goaf side, which helps to shift the center of gravity of the shearer towards the goaf side and improve the overall stability of the shearer.

[0044] As Figure 2 shown in the figure, the left and right cutting parts are symmetrical left and right. Each includes a transition frame 22 and a rocker arm 21. The transition frame and the rocker arm are longitudinally butted along the length direction, and are detachably and fixedly connected between them. The transition frame and the rocker arm are simultaneously in pin-hole fit with a set of pins. This set of pins vertically penetrates the joint surface of the transition frame and the rocker arm to achieve lateral positioning. The pins can be cylindrical pins. The detachable and fixed connection between the transition frame and the rocker arm can be realized by screws. The rocker arm housing and the transition frame are preferably made of castings. For the same set of shearers, multiple pairs of transition frames with different lengths can be matched. By replacing and installing transition frames with different lengths, the length of the cutting part can be changed, so as to meet different mining height requirements, improve the adaptability of the shearer, while the rocker arm remains unchanged. Except for the transition frames, the rest of the left cutting part and the right cutting part can be interchanged.

[0045] A motor 2-1, nine groups of spur gears 2-2 and a two-stage planetary mechanism 2-3 which are connected in sequence can be arranged inside the rocker arm. The output end of the two-stage planetary mechanism 2-3 is coaxially connected to the corresponding drum. The motor drives the nine groups of spur gears and the two-stage planetary mechanism to reduce the output power and drive the drum to work.

[0046] The traction unit and the electric control box are butted against each other left and right. The left traction housing, the electric control box and the right traction housing form three sections of the coal shearer body. In this embodiment, the total length of the three sections of the body is within 9400 mm. At the joint between the traction housing and the electric control box, a pin hole fit with multiple large round cake pins is carried out simultaneously to prevent shearing. In addition, the three sections of the body are distributed and fastened by multiple long screw rods running through left and right, and the joints between the electric control box and the left and right traction parts are distributed and fastened by multiple short screw rods, so as to improve the connection strength of the three sections of the body and the ability to withstand the impact of complex loads during drum cutting. In this embodiment, the three sections of the body are connected and fastened together by 6 groups of M80 long screw rods and several groups of M36 short screw rods to withstand the reaction force of drum coal cutting. The 6 groups of M80 long screw rods adopt a long screw rod layout structure of 2-2-1-1, that is, two groups on the goaf side and the coal wall side at the lower part of the three sections of the body respectively, and one group on the goaf side and the coal wall side at the top of the three sections of the body respectively. Several groups of M36 short screw rods are distributed around the joint surface of the traction box and the electric control box.

[0047] According to measurement and experiment, the length of the cutting part should be controlled within the range of 4000 mm - 4500 mm, the weight should be controlled within the range of 28 t - 34 t, and the cutting power should be controlled within the range of 1100 kW - 1250 kW. This not only ensures the length of the rocker arm, meets the requirements of the overall machine mining height plan, and the maximum mining height can reach 9 m, but also indirectly controls the overall weight of the coal shearer, helps to shift the center of gravity of the coal shearer to the goaf side, and also meets the power output speed and torque.

[0048] In addition, the diameter of the drum should be controlled within the range of 3500 - 4500 mm, the weight of the drum should be controlled within 17 t, and the height of the body should be controlled within the range of 3800 - 4200 mm. By comprehensively adjusting the drum diameter, the body height and the cutting part length, different mining heights can be adapted, which not only ensures the interchangeability of a large number of components, but also realizes the requirement of fully mining the full height of extra-thick coal seams with different thicknesses at one time.

[0049] The lifting oil cylinder 8 is preferably installed at the top of the corresponding traction unit and close to the coal wall side. By controlling the telescopic movement of the lifting oil cylinder, the lifting and lowering of the cutting part can be realized to meet different mining height requirements. One end of the cylinder barrel 81 of the lifting oil cylinder is hinged to the oil cylinder connection seat at the top of the corresponding traction unit close to the coal wall side, and the cylinder rod 82 of the lifting oil cylinder is hinged to the corresponding cutting part, specifically, it can be hinged to the transition frame of the cutting part. When the coal shearer is working, the large chamber of the lifting oil cylinder is stressed, which reduces the pressure of the hydraulic system and improves the reliability of the balance valve.

[0050] Such asFigure 3 As shown, a coal accumulation prevention structure is preferably provided at the top of the traction housing below the swing position of the height adjustment cylinder 8. The coal accumulation prevention structure is an inclined plane A located at the top of the traction housing, and the part of the inclined plane closer to the coal wall side is lower. When the pulverized coal or coal blocks generated during the operation of the shearer fall below the height adjustment cylinder, they will automatically slide down the fuselage due to the guidance of the inclined plane, thereby preventing the cylinder rod from being jammed by the accumulated coal and bent or even broken when the height adjustment cylinder swings downward.

[0051] The outer surface of the bottom of the traction housing is arranged in an incompletely closed frame structure, and on the side close to the coal wall, it is shown as having a plurality of rectangular groove structures B with side walls on all four sides, such as Figure 4 、 5 shown. In this embodiment, there are two on the left and right. The top of the support leg is upwardly conformally embedded in each of the rectangular grooves and is fixedly connected to the corresponding traction housing by horizontally passing a pin shaft 11. The side surface of the top of the support leg fits with the side wall of the rectangular groove to achieve positioning support, and the force-bearing effect is good. The pin shaft 11 corresponds to the rectangular groove one by one. The connection structure between the support leg and the traction housing can achieve high connection reliability. The support leg is preferably made of a welded structure, one is to reduce the weight, the second is to improve the production efficiency, reduce the production time, and save the cost of the wooden mold.

[0052] Regarding the fully welded structure of high-strength plates of the traction housing, taking the traction housing of the right cutting part as an example, as Figure 6 、 7 shown, it is provided with a top plate 51, a bottom plate, a left side plate, a first rocker arm connecting plate 52, a second rocker arm connecting plate 53, a third rocker arm connecting plate 54, a fourth rocker arm connecting plate 55 and a plurality of right side plates 56. The first rocker arm connecting plate and the fourth rocker arm connecting plate respectively act as the rear side plate and the front side plate and are fixedly connected to the top plate, the bottom plate and the left side plate. The first to fourth rocker arm connecting plates are arranged in sequence and are parallel and spaced apart. Between the top plate and the bottom plate at each interval, they are hermetically connected by one of the right side plates. The first to fourth rocker arm connecting plates all extend rightward beyond the right side plate, and the part extending rightward forms a mounting seat for the right cutting part. Pin holes are provided on the plate surfaces of the part extending rightward. Two upwardly extending oil cylinder connecting plates 57 parallel to the front side plate are fixed to the left front part of the top plate to form an oil cylinder connecting seat for the height adjustment cylinder corresponding to the right cutting part, and pin holes are provided on the oil cylinder connecting plates. The upper and lower edges of some or all of the plates of the first, second, third, and fourth rocker arm connecting plates are respectively embedded in the slots provided on the top plate and the bottom plate and opening at the right edge and extending left and right. The structures of the traction housings of the left and right cutting parts are symmetrical about the left and right.

[0053] The first to fourth rocker connecting plates are the framework of the traction housing, which play a major supporting role for the traction housing and can significantly improve the rigidity of the traction housing. The plates are inserted into each other through slots to form a cross-shaped framework structure, significantly improving the structural strength and reliability of the traction housing.

[0054] The lower parts of the two oil cylinder connecting plates are vertically inserted a certain distance below the top plate and are welded together through a rib plate 58 to form a "rooting" design, which can significantly improve the welding reliability and the stability of the oil cylinder connecting plates. The oil cylinder connecting plates are welded and fixed to the top plate. The lower part of the oil cylinder connecting plate 57 near the front side is attached to and welded to the fourth rocker connecting plate 55, which improves the welding strength on the one hand and provides mutual support on the other hand.

[0055] The electric control box extends horizontally. Inside it, there are a wiring cavity and an electrical component installation cavity. The wiring cavity is located above the electrical component installation cavity and near the coal wall side, making the cross-sectional outer contour of the electric control box in an L shape. As Figure 8 shown, the main cable of the shearer is arranged at the notch of the L-shaped structure outside the electric control box, that is, on the goaf side of the wiring cavity. By adjusting the spatial layout of the relevant cavities, the left-right length of the electric control box can be shortened and the weight of the electric control box can be reduced. The cables, water pipes and oil pipes of the shearer can be arranged along the top of the fuselage and connected to each component, reducing the wire passing cavities in the traction box and shortening the total size of the traction box. By comprehensively controlling the sizes of the traction box and the electric control box, the total length of the three sections of the fuselage is within 9400 mm.

[0056] As Figure 9 shown, the traveling box includes a traveling box housing 92, a gear transmission system, a guiding slide shoe 93, a traveling wheel assembly and a traveling wheel shaft 94. The gear transmission system uses large-module carburized gears on the tooth surface 91, and the gear module is ≥30 to improve the traction force of the shearer for extra-thick coal seams and increase the traction weight ratio. At the same time, the guiding slide shoe 93 is externally wrapped and installed at the lower part of the traveling box housing 92, that is, the front and rear ears of the guiding slide shoe are located outside the traveling box housing.

[0057] The present invention is matched with large underground scraper conveyors and extra-high mining hydraulic supports, and can realize the integration and automation of coal mining, caving, loading, transportation, support and control in a 9-m extra-thick coal seam working face with one-pass full height mining.

[0058] The present invention provides a technical solution and related technical parameters for a shearer in a fully mechanized coal mining face with a 9m extra-thick coal seam, featuring double large drums, double long cutting parts, a high fuselage, and upper-mounted height-adjusting cylinders. It has taken the lead in realizing the full-height mining of a fully mechanized coal mining face with an extra-thick coal seam where the double drums can achieve a full height of 9m at one time. The whole machine is reliably connected and has a moderate weight. Through lightweight design, the weights of the cutting parts and drums are controlled, and the center of gravity of the whole machine is more inclined towards the goaf side, significantly increasing stability without affecting the coal loading effect of the shearer. For the mine operator, the whole machine has fewer component types, greatly increasing the adaptability to working faces with different coal seam thicknesses, facilitating the interchangeability of shearer components, having good economy, and adopting a mature fully mechanized coal mining face mining process, which is conducive to high-yield and high-efficiency mining of the working face.

Claims

1. A shearer for fully-mechanized coal mining face in extra-thick coal seam, comprising an electric control box, two left and right traction units, two left and right cutting units, two left and right drums, two left and right support legs and two left and right traveling boxes. The two left and right traction units are fixed on the left and right sides of the electric control box, and the three of them form the main part of the machine body. The two left and right traction units are respectively fixed and supported on the two left and right support legs. The two left and right cutting units are respectively supported and connected to the two left and right traction units through a lifting cylinder, and the corresponding cutting unit, lifting cylinder and traction unit form a guide rod mechanism. The free ends of the two left and right cutting units are respectively installed with two left and right drums. The goaf sides of the left traction unit and the right traction unit are respectively fixed to the two left and right traveling boxes. It is characterized in that: The length of the cutting unit is controlled within 4000mm - 4500mm, the diameter of the drum is controlled within the range of 3500 - 4500mm, the height of the machine body is controlled within the range of 3800 - 4200mm. The electric control box extends left and right, and is internally provided with a wiring cavity and an electrical component installation cavity. The wiring cavity is located above the electrical component installation cavity and close to the coal wall side, so that the cross-sectional outer contour of the electric control box is in an L shape. The main cable of the shearer is arranged at the notch of the L-shaped structure outside the electric control box. The shearer cables, water pipes and oil pipes are arranged along the top of the machine body. The traction unit includes a traction housing and a gear transmission system located inside the traction housing. The traction housing is a fully welded structure of high-strength plates. The traction housing of the right traction unit is provided with a top plate, a bottom plate, a left side plate, a first rocker connecting plate, a second rocker connecting plate, a third rocker connecting plate, a fourth rocker connecting plate and several right side plates. Two upwardly overhanging oil cylinder connecting plates parallel to the front side plate are fixed at the left front part of the top plate, forming an oil cylinder connecting seat for the lifting cylinder corresponding to the right cutting unit. The upper and lower edges of some or all of the plates in the middle of the first, second, third and fourth rocker connecting plates are respectively embedded in the slots arranged on the top plate and the bottom plate and opening at the right edge and extending left and right. The traction housing structures of the left and right traction units are symmetrical left and right. A coal accumulation prevention structure is arranged at the top of the traction housing below the swinging position of the lifting cylinder. The coal accumulation prevention structure is an inclined surface at the top of the traction housing, and the part of the inclined surface closer to the coal wall side is lower.

2. The shearer for fully-mechanized coal mining face in extra-thick coal seam according to claim 1, It is characterized in that: The cutting unit includes a transition frame and a rocker arm. The transition frame and the rocker arm are longitudinally butted and detachably fixedly connected. The transition frame and the rocker arm are simultaneously in pin hole fit with a group of pins on the butting surface to achieve lateral positioning.

3. The shearer for fully-mechanized coal mining face in extra-thick coal seam according to claim 2, It is characterized in that: The traction unit and the electric control box are butted left and right. At the joint, both of them are simultaneously in pin hole fit with multiple large round cake pins. The three of the left and right traction units and the electric control box are distributed and fastened through multiple long screw rods running through left and right. The two-by-two joints of the electric control box and the left and right traction units are distributed and fastened through multiple short screw rods.

4. The shearer for fully-mechanized coal mining face in extra-thick coal seam according to claim 3, It is characterized in that: The weight of the cutting unit is controlled within 28t - 34t, and the cutting power is controlled within 1100kW - 1250kW.

5. The shearer for fully-mechanized coal mining face in extra-thick coal seam as claimed in claim 4, characterized in that: the weight of the drum is controlled within 17t.

6. The shearer for fully-mechanized coal mining face in extra-thick coal seam as claimed in claim 1, 2, 3, 4 or 5, characterized in that: one end of the cylinder barrel of the height-adjusting oil cylinder is hinged to the oil cylinder connecting seat on the side close to the coal wall at the corresponding traction top, and the rod of the height-adjusting oil cylinder is hinged to the corresponding cutting part.

7. The shearer for fully-mechanized coal mining face in extra-thick coal seam as claimed in claim 6, characterized in that: the outer surface on the side close to the coal wall at the bottom of the traction housing is provided with a rectangular groove structure with side walls on four sides in multiple places, the top of the support leg is upwardly and conformally embedded into each of the rectangular grooves, and is fixedly connected with the corresponding traction housing through a transverse pin shaft, and the support leg adopts a welded structure.

8. The shearer for fully-mechanized coal mining face in extra-thick coal seam as claimed in claim 1, 2, 3, 4 or 5, characterized in that: the first rocker arm connecting plate and the fourth rocker arm connecting plate respectively act as the rear side plate and the front side plate and are fixedly connected with the roof, the floor and the left side plate. The first to fourth rocker arm connecting plates are arranged in sequence and are parallel and spaced apart. The roof and the floor at each interval are hermetically connected through one of the right side plates. The first to fourth rocker arm connecting plates all extend rightward beyond the right side plate, and the rightward extending part forms a mounting seat for the right cutting part.

9. The shearer for fully-mechanized coal mining face in extra-thick coal seam as claimed in claim 8, characterized in that: the lower parts of the two oil cylinder connecting plates are vertically inserted a certain distance below the roof and are welded together through a rib plate. The oil cylinder connecting plates are welded and fixed to the roof. The lower part of the oil cylinder connecting plate close to the front side is in contact with and welded to the fourth rocker arm connecting plate.

10. The shearer for fully-mechanized coal mining face in extra-thick coal seam as claimed in claim 1, 2, 3, 4 or 5, characterized in that: the gear transmission system of the walking box adopts large-module carburized gears on the tooth surface, the module ≥ 30, and the guiding slide shoes of the walking box are externally installed at the lower part of the housing of the walking box.

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