Wide Adaptability Cutting System for Thin Coal Seam Shearer

Abstract

The present invention relates to a wide - adaptability cutting system for a thin - seam shearer, which comprises a non - swinging transmission part and a motor - less rocker arm. The non - swinging transmission part includes a stationary housing and a front - stage transmission system, and the motor - less rocker arm includes a rocker - arm housing and a rear - stage transmission system. A cutting motor is installed in the stationary housing, the root of the rocker - arm housing is rotatably supported in the stationary housing, the output shaft of the cutting motor is connected to the rear - stage transmission system through the front - stage transmission system. A large gear coaxially connected to the input end of the rear - stage transmission system and a planetary mechanism are arranged in the root chamber of the rocker - arm housing, and the axis of the large gear is coaxial with the rotation center of the root of the rocker - arm housing. Both ends of the oil cylinder are hinged to the rocker - arm housing and the stationary housing respectively, and the axis of the large gear and the hinge axes at both ends of the oil cylinder extend in the front - rear direction. The present invention can solve the problem of the structural layout of a low - body high - power thin - seam shearer for a coal - rock working face with a large mining range and complex geological conditions, and at the same time can maintain a relatively wide cutting - height range.

Description

Technical Field

[0001] The present invention relates to a cutting system for a shearer, especially applicable to shearers for thin coal seams. After application, the mining range of the corresponding shearer for thin coal seams can be increased, and it can adapt to coal and rock working faces with more complex geological conditions. Background Art

[0002] For the mining of thin or extremely thin coal seams, the geological conditions are often complex, such as the coexistence of coal and rock. Therefore, in order to improve the reliability of the shearer, the installed power requirement of the shearer for thin coal seams is also increasing to improve its adaptability. However, as the power increases, the sizes of the motor, transmission system, etc. also increase correspondingly. When mining thin coal seams, the working face of the shearer is usually narrow. If the external dimensions of the shearer are too large, the external space of the shearer will be compressed. For example, the clearance between machines and the coal passing height will decrease, which will seriously affect the passing and loading of the shearer. Therefore, the increase in installed power makes the already difficult structural layout problem of the shearer for thin or extremely thin coal seams more prominent.

[0003] The industry has proposed and gradually used a technical solution in which large and medium-sized parts such as motors and transmission gears are moved forward from above the original scraper conveyor to the side close to the coal wall, that is, the method of using a suspended fuselage is adopted to solve the layout problem of large and medium-sized parts. Although this method can improve the structural layout problem to a certain extent, for example, it helps to increase the clearance between machines, it also brings other prominent problems, such as Figure 17 、 18 As shown, specifically including: Since large and medium-sized parts such as the cutting motor of the cutting system need to swing upward with the rocker arm, especially in the case of the rear drum cutting the top coal (see the clearance A and the unmined amount B shown in Figure 17 ), because the rocker arm housing is very easy to scrape and interfere with the upper coal platform, the upward adjustment amount of the rear drum is greatly reduced, and it is impossible to further mine higher coal, or even if the theoretical roof adjustment amount is very large, it is actually impossible to truly meet the mining needs of coal seams with a wider mining height range. That is, this layout method sacrifices a part of the mining height range. Summary of the Invention

[0004] The present invention aims to provide a cutting system with wide adaptability for a shearer for thin coal seams, to solve the structural layout problem of a low-fuselage high-power shearer for thin coal seams in coal and rock working faces with a large mining range and complex geological conditions, and at the same time can maintain a relatively wide mining height range.

[0005] The main technical solutions of the present invention are as follows:

[0006] A wide - adaptability cutting system for a thin - seam coal shearer, comprising a non - swing transmission part, a motor - less rocker arm, a cutting motor and an oil cylinder. The non - swing transmission part includes a static housing and a front - stage transmission system arranged in the static housing. The motor - less rocker arm includes a rocker - arm housing and a rear - stage transmission system arranged in the rocker - arm housing. The static housing is provided with a motor installation cavity and a rocker - arm installation cavity. The cutting motor is fixedly installed in the motor installation cavity. The root of the rocker - arm housing is rotatably supported in the rocker - arm installation cavity. The output shaft of the cutting motor is connected to the rear - stage transmission system through the front - stage transmission system. The input end of the rear - stage transmission system is provided with a large gear and a planetary mechanism coaxially connected in sequence. The large gear and the planetary mechanism are arranged in the cavity at the root of the rocker - arm housing. The axis of the large gear is coaxial with the rotation center of the root of the rocker - arm housing. The two ends of the oil cylinder are respectively hinged to the rocker - arm housing and the static housing. The axis of the large gear and the hinge axes at both ends of the oil cylinder both extend in the front - rear direction.

[0007] The rocker - arm housing further includes a head and a neck located between the head and the root. The rocker - arm housing presents a concave - shaped structure with both the head and the root protruding forward relative to the neck.

[0008] The output end of the front - stage transmission system adopts a small gear and an intermediate gear set that mesh externally with each other. The intermediate gear set meshes externally with the large gear. The intermediate gear set includes an eccentric shaft, an eccentric sleeve, a bearing and an intermediate gear. The eccentric shaft includes a reference shaft section at both ends and an eccentric shaft section in the middle. On the surface of the eccentric shaft section, an outer eccentric groove and an inner eccentric groove that extend axially and are closed at both ends are respectively provided at the positions farthest and nearest to the axis of the reference shaft section. On the wall of the hole of the eccentric sleeve, a key groove that extends axially and is not closed at both ends is provided at the thickest part of the wall thickness. The eccentric sleeve is sleeved on the eccentric shaft section. The key groove is paired with the outer eccentric groove or the inner eccentric groove and forms a key connection with a key between the eccentric shaft and the eccentric sleeve. The reference shaft sections at both ends of the eccentric shaft are both fixed on the static housing. The intermediate gear is installed on the outer cylindrical surface of the eccentric sleeve through the bearing. The intermediate gear is located between the small gear and the large gear and meshes externally with them respectively. The axes of the small gear, the intermediate gear and the large gear are in the same plane. The eccentric shaft has two optional installation positions, which are respectively the positions where the outer eccentric groove and the inner eccentric groove are closest to the axis of the large gear.

[0009] Key grooves can be provided on at least one outer end surface of the reference shaft section.

[0010] A housing notch is provided on the common side wall between the rocker arm mounting cavity and other adjacent cavities on the stationary housing. A rocker arm housing notch is provided on the root side wall of the rocker arm housing. In the installed state, the rocker arm housing notch always has a partially overlapping area with the housing notch in the circumferential direction. The intermediate gear set and the large gear are kept meshing in the overlapping area of the housing notch and the rocker arm housing notch.

[0011] A bearing seat is also fixed on the inner wall of the cavity at the root of the rocker arm housing near the large gear. The input shaft diameter of the large gear is supported on the inner wall of the bearing seat through a bearing. A bearing seat notch is provided on the side wall of the bearing seat. The circumferential position and size of the bearing seat notch are preferably the same as those of the rocker arm housing notch.

[0012] A guard plate is installed on the stationary housing. The stationary housing, the rocker arm housing, and the guard plate together enclose a closed cavity, and the oil cylinder is located in the closed cavity.

[0013] When the stationary housing is used for a shearer, there are at least the following four structural forms. Structural form one: It is divided into a left stationary housing and a right stationary housing, and the structures of the left stationary housing and the right stationary housing are symmetric left and right. A single stationary housing is provided with a motor mounting cavity and a rocker arm mounting cavity. Structural form two: A single stationary housing is provided with a motor mounting cavity and two rocker arm mounting cavities. The motor mounting cavity is arranged in the middle left and right, and other structures are arranged symmetrically left and right. Structural form three: A single stationary housing is provided with two motor mounting cavities and two rocker arm mounting cavities. The stationary housing is a symmetric structure left and right. The two motor mounting cavities are located in the middle of the stationary housing in the left and right directions, and an additional independent cavity may or may not be provided between the two motor mounting cavities. Structural form four: There is only one stationary housing, and a single stationary housing is provided with a motor mounting cavity and a rocker arm mounting cavity.

[0014] A positioning and connecting structure is provided on the outer side wall of the stationary housing.

[0015] The positioning and connecting structure is provided on the rear outer wall of the stationary housing and includes a positioning hole and a fastening hole.

[0016] The beneficial effects of the present invention are:

[0017] The present invention adopts a brand-new structural arrangement method, including arranging a swing transmission part and a non-swing transmission part, enabling the swing transmission part to swing around a fixed axis relative to the non-swing transmission part, and placing large and medium-sized components such as a cutting motor, a planetary mechanism, and a large gear in the housing of the non-swing transmission part. When the swing transmission part rotates, the positions of the large and medium-sized components remain unchanged. Therefore, when the front drum uses the bottom cutter to cut out the passage for the suspended fuselage, and the rear drum uses the top cutter to cut off the remaining coal platform, they will not be affected by the large and medium-sized components. Thus, the rocker arm housing will not interfere with the coal platform, achieving the suspended fuselage arrangement method, reducing the height of the shearer fuselage, and ensuring the required cutting height range.

[0018] Due to the adoption of the gear speed change mechanism with an eccentric shaft and an eccentric sleeve as the core in the present invention, by changing the installation directions of the eccentric shaft and the eccentric sleeve and replacing the large gear and the small gear of different sizes accordingly, a wide range of speed changes can be achieved. With different specifications of drums, more choices can be provided for parameters such as cutting force and cutting line speed, so as to adapt to the mining of various materials with different hardnesses such as coal and rock.

[0019] The present invention uses the static housing, the rocker arm housing, and the guard plate to jointly enclose a closed cavity, providing a good external working environment for the oil cylinder, avoiding the adverse effects of coal powder, gangue, etc. on the oil cylinder, making the telescoping of the oil cylinder more reliable and having a longer service life, thus providing a more reliable and high-quality support for the rotation of the rocker arm relative to the non-swing transmission part. Description of the Drawings

[0020] Figure 1 is the front view of the left cutting system of the present invention;

[0021] Figure 2 is the sectional view of the left cutting system of the present invention;

[0022] Figure 3 is the front view of the motorless rocker arm of the left cutting system of the present invention;

[0023] Figure 4 is the sectional view of the motorless rocker arm of the left cutting system of the present invention;

[0024] Figure 5 is the partial sectional view of the notch of the rocker arm housing and the notch of the bearing seat;

[0025] Figure 6 is the sectional view of a partial structure of the non-swing transmission part of the left cutting system of the present invention;

[0026] Figure 7 is the structural schematic diagram of the intermediate gear set;

[0027] Figure 8 is Figure 7 the structural schematic diagram of the eccentric shaft described in

[0028] Figure 9 is Figure 7 the structural schematic diagram of the eccentric sleeve described in

[0029] Figure 10 the structural schematic diagram of the large reduction ratio gear transmission mechanism of the present invention;

[0030] Figure 11 the structural schematic diagram of the medium reduction ratio gear transmission mechanism of the present invention;

[0031] Figure 12 the structural schematic diagram of the small reduction ratio gear transmission mechanism of the present invention;

[0032] Figure 13 the structural schematic diagram of the whole cutting system including the left and right sides of the present invention;

[0033] Figure 14 the sectional view of the whole cutting system including the left and right sides of the present invention;

[0034] Figure 15 the structural schematic diagram of an embodiment when the static housing of structural type three is adopted in the present invention;

[0035] Figure 16 the structural schematic diagram of an embodiment when the static housing of structural type two is adopted in the present invention;

[0036] Figure 17 the schematic diagram of the coal mining state of the existing suspended fuselage coal shearer;

[0037] Figure 18 the schematic diagram of the unilateral cutting system of the existing suspended fuselage coal shearer.

[0038] Reference numerals:

[0039] 1. Non-swing transmission part; 11. Static housing; 111. Housing notch; 112. Front positioning hole; 113. Rear positioning hole; 114. Rocker arm mounting cavity; 115. Cylinder seat; 116. Closed cavity; 117. Positioning hole; 118. Fastening hole; 12 (and 12', 12"). Pinion; 13. Intermediate gear set; 131. Eccentric shaft; 1311. Reference shaft section; 1312. Eccentric shaft section; 1313. Outer eccentric groove; 1314. Inner eccentric groove; 1315. Keyway; 132. Eccentric sleeve; 1323. Keyway; 133. Bearing; 134. Intermediate gear; 14. Guard plate;

[0040] 2. Motorless rocker arm; 20. Support positioning bearing; 21. Rocker arm housing; 211. Rocker arm housing notch; 22 (and 22', 22"). Large gear; 23. Planetary mechanism; 24. Fixed-axis gear transmission structure; 25. Drum; 26. Bearing seat; 261. Bearing seat notch; 27. Oil cylinder seat;

[0041] 3. Oil cylinder. Specific implementation manner

[0042] The present invention discloses a wide-adaptability cutting system for a thin coal seam shearer, as Figures 1-16 shown, which includes a non-swing transmission part 1, a motorless rocker arm 2, a cutting motor, and an oil cylinder 3. The non-swing transmission part includes a static housing 11 and a front-stage transmission system arranged in the static housing. The motorless rocker arm is equivalent to a swing transmission part, including a rocker arm housing 21 and a rear-stage transmission system arranged in the rocker arm housing. An electric motor installation cavity and a rocker arm installation cavity 114 are provided in the static housing. The cutting motor is fixedly installed in the electric motor installation cavity. The root of the cylindrical structure of the rocker arm housing is rotatably supported in the rocker arm installation cavity, so that the rocker arm housing can perform fixed-axis swinging relative to the static housing, where the root of the rocker arm housing only "rotates on its own" in the static housing.

[0043] The output shaft of the cutting motor is connected to the rear-stage transmission system through the front-stage transmission system, that is, the power output by the cutting motor is sequentially transmitted through the front-stage transmission system and the rear-stage transmission system, and finally transmitted to the drum 25 at the other end of the rocker arm housing. The input end of the rear-stage transmission system is provided with a large gear 22 and a planetary mechanism 23 that are coaxially connected in sequence. The large gear and the planetary mechanism are arranged in the chamber at the root of the rocker arm housing. The axis of the large gear is coaxial with the rotation center of the root of the rocker arm housing. When the rocker arm performs fixed-axis swinging, the large gear 22 and the planetary mechanism 23, as large and medium-sized parts in the rear-stage transmission system, always "rotate on their own" in the static housing. The cutting motor, as another large and medium-sized component, will not change its position with the swinging of the rocker arm because it is installed in the static housing, especially there is no height change. Therefore, a large space can be maintained between the rocker arm housing and the upper coal platform. Therefore, even when the rear rocker arm cuts the top coal, the rocker arm housing will not interfere with the coal platform, etc. Therefore, the present invention can solve the problem of the layout of large and medium-sized parts while ensuring that the theoretical cutting height range does not shrink. In addition, the above-mentioned large and medium-sized parts are closer to the coal wall side than the small and medium-sized parts of the cutting system, which is beneficial to reducing the machine surface height of the shearer.

[0044] Both ends of the oil cylinder are respectively hinged to the rocker arm housing and the stationary housing. The axis of the large gear and the hinge axes at both ends of the oil cylinder both extend in the front-rear direction. The front and rear directions of the shearer are the directions from the inside of the shearer to the coal wall side and the goaf side of the shearer respectively. The oil cylinder expands and contracts to drive the rocker arm to rotate and swing relative to the non-swing transmission part.

[0045] As Figure 2 shown, in the installed state, the opening of the rocker arm installation cavity faces backward, and the root cylinder structure of the rocker arm housing is inserted into the rocker arm installation cavity from back to front and is rotatably supported on the inner wall of the rocker arm installation cavity by two front and rear support positioning bearings 20. In this embodiment, the front and rear sections of the inner wall of the rocker arm installation cavity 114 are respectively a front positioning hole 112 and a rear positioning hole 113, which are respectively used for installing the two front and rear support positioning bearings 20.

[0046] The rocker arm housing further includes a head and a neck located between the head and the root. The rocker arm housing presents a concave-shaped structure in which both the head and the root protrude forward relative to the neck. The large gear 22, the planetary mechanism 23 and the medium and small-sized fixed-axis gear transmission structure 24 form the rear-stage transmission system. The fixed-axis gear transmission structure 24 is located in the chambers of the neck and the head. The drum 25 is installed on the head of the rocker arm housing and rotates relative to the rocker arm housing.

[0047] The output end of the front-stage transmission system can adopt a small gear 12 and an intermediate gear set 13 that are externally meshed with each other, and the intermediate gear set is externally meshed with the large gear.

[0048] In this embodiment, the intermediate gear set preferably includes an eccentric shaft 131, an eccentric sleeve 132, a bearing 133 and an intermediate gear 134. The eccentric shaft includes a reference shaft section 1311 at both ends and an eccentric shaft section 1312 in the middle. On the surface of the eccentric shaft section, an outer eccentric groove 1313 and an inner eccentric groove 1314 that extend axially and are closed at both ends are respectively provided at the positions farthest and closest to the axis of the reference shaft section. On the wall of the hole of the eccentric sleeve, a key groove 1323 that extends axially and is not closed at both ends is provided at the thickest part of the wall thickness. The eccentric sleeve is sleeved on the eccentric shaft section, and the key groove 1323 is paired with the outer eccentric groove or the inner eccentric groove and forms a key connection with a key between the eccentric shaft and the eccentric sleeve. The reference shaft sections at both ends of the eccentric shaft are fixed on the stationary housing, and the intermediate gear 134 is installed on the outer cylindrical surface of the eccentric sleeve through the bearing 133. The intermediate gear is located between the small gear 12 and the large gear 22 and is externally meshed with them respectively. The axes of the small gear, the intermediate gear and the large gear are located in the same plane. The small gear, the intermediate gear set and the large gear form a gear speed change mechanism.

[0049] The eccentric shaft has two optional mounting positions relative to the stationary housing, namely the positions where the outer eccentric groove and the inner eccentric groove are closest to the axis of the large gear. The eccentric sleeve also has two optional mounting positions relative to the eccentric shaft section, namely the positions where the outer eccentric groove and the inner eccentric groove on the eccentric shaft section are paired with the key groove 1323 on the eccentric sleeve and key-connected with a key. When the eccentric shaft and the eccentric sleeve are arranged and installed according to their respective two optional mounting positions, with the mounting position of the reference shaft section of the eccentric shaft fixed, the axis of the outer cylindrical surface of the eccentric sleeve can have 3 - 4 positions, that is, the axis of the intermediate gear 134 can have 3 - 4 possible positions. In other words, the distances between the intermediate gear and the axes of the large gear and the small gear can have 3 - 4 possible variations. By simply replacing the large gears 22, 22' or 22" of different sizes and the small gears 12, 12' or 12" of different sizes to adapt to this change in distance, different reduction ratios can be achieved, so as to obtain a wide range of rotational speeds at the drum and achieve the purpose of speed change.

[0050] By adopting the above gear speed change mechanism, different rotational speed outputs of the end drum 25 can be achieved, so that different output cutting parameters, such as cutting force and cutting line speed, can be obtained. After configuring drums of different diameters, the mining of different hardness materials such as coal and rock can be achieved.

[0051] Key grooves 1315 can be provided on at least one outer end face of the reference shaft section. The key grooves 1315 cooperate with keys to achieve the positioning and anti-rotation of the eccentric shaft. The extending direction of the key grooves is preferably perpendicular to the plane where the axes of the small gear, the intermediate gear and the large gear are located, which is the vertical direction in this embodiment.

[0052] A housing notch 111 is provided on the common side wall between the rocker arm mounting cavity on the stationary housing and other adjacent cavities (mainly referring to the cavity where the output end of the front-stage transmission system is located) to provide space for the rotation of the intermediate gear. A rocker arm housing notch 211 is correspondingly provided on the root side wall of the rocker arm housing. In the installed state, the rocker arm housing notch 211 always has a partially overlapping area with the housing notch 111 in the circumferential direction, and this overlapping area should be large enough to ensure that the intermediate gear set and the large gear remain meshed in the overlapping area of the housing notch and the rocker arm housing notch.

[0053] In this embodiment, a bearing seat 26 is also fixed on the inner wall of the cavity at the root of the rocker arm housing 21 near the large gear. The input shaft diameter of the large gear is supported on the inner wall of the bearing seat 26 through a bearing. In this case, a bearing seat notch 261 is also provided on the side wall of the bearing seat. See Figure 5, the circumferential position and size of the bearing housing notch 261 are preferably the same as those of the rocker arm housing notch 211. The rocker arm housing notch 211 and the bearing housing notch 261 together provide sufficient space for the intermediate gear 134 and the large gear 22.

[0054] Except for the parts mentioned above, the front-stage transmission system and the rear-stage transmission system can adopt existing transmission structures, such as gear transmission, spline transmission, etc.

[0055] A guard plate 14 is installed on the stationary housing. The stationary housing, the rocker arm housing and the guard plate together enclose a closed cavity 116. The oil cylinder seat 115 provided on the stationary housing is located in the closed cavity, and the oil cylinder seat 27 provided on the outer side of the root of the rocker arm housing is also located in the closed cavity. In the installed state, during the swinging process of the rocker arm without the motor, the whole oil cylinder is always in the closed cavity. The closed cavity provides a good external environment for the oil cylinder. For example, it can avoid the influence of coal powder and gangue on the oil cylinder, make the telescopic of the oil cylinder more reliable and have a longer service life, thus providing a more reliable and high-quality support for the rotation of the rocker arm relative to the non-swinging transmission part.

[0056] When the stationary housing is used for a shearer, it can have at least the following four structural forms.

[0057] Structural form one: It is divided into a left stationary housing and a right stationary housing. The structures of the left stationary housing and the right stationary housing are symmetric left and right. A single stationary housing is provided with a motor installation cavity and a rocker arm installation cavity. The left and right rocker arms are respectively driven by their own cutting motors.

[0058] Structural form two: A single stationary housing is provided with a motor installation cavity and two rocker arm installation cavities. As Figure 16 shown, the motor installation cavity is arranged in the middle left and right, and other structures are symmetrically arranged left and right. The left and right rocker arms are not only installed on the same stationary housing, but also share the same cutting motor.

[0059] Structural form three: A single stationary housing is provided with two motor installation cavities and two rocker arm installation cavities. Figure 15 Shown is an embodiment of structural form three. The stationary housing is preferably a symmetric structure left and right. The two motor installation cavities are located in the middle of the stationary housing in the left and right directions. Although the left and right rocker arms are installed on the same stationary housing, they are respectively driven by two cutting motors on the left and right. For a double-drum shearer, adopting the stationary housing of this structural form can make the overall structure of the shearer more compact and suitable for double-drum operation in wide mining height and thin coal seams on the left or right. In addition, an independent cavity for installing the electric control system can be additionally provided between the two motor installation cavities, so that the existing separate electric control box can be cancelled.

[0060] Structural type four: There is only one stationary housing, and there is a motor installation cavity and a rocker arm installation cavity in a single stationary housing. This structural type is equivalent to only using the left stationary housing or the right stationary housing in structural type one, and correspondingly only installing the left rocker arm or the right rocker arm, which is used on a single-drum shearer. This structural type can be adopted when it is necessary to shorten the fuselage and improve the adaptability of the shearer.

[0061] The above parts related to left-right symmetry are all matching structures for respectively installing the left rocker arm and the right rocker arm.

[0062] Positioning and connecting structures are provided on the outer side walls of the stationary housing for positioning and connecting with the shearer fuselage or other adjacent structural members.

[0063] The positioning and connecting structure is preferably arranged on the rear outer wall of the stationary housing and includes a positioning hole 117 and a fastening hole 118. There can be multiple positioning holes, arranged at intervals left and right, for realizing pin-hole fit to position the stationary housing. A number of the fastening holes can be arranged around each positioning hole for fixedly connecting the stationary housing with the fuselage or other structures of the shearer.

Claims

1. A wide - adaptability cutting system for a thin - seam coal shearer, characterized in that: It includes a non - swing transmission part, a motor - less rocker arm, a cutting motor and an oil cylinder. The non - swing transmission part includes a static housing and a front - stage transmission system arranged in the static housing. The motor - less rocker arm includes a rocker - arm housing and a rear - stage transmission system arranged in the rocker - arm housing. The static housing is provided with a motor installation cavity and a rocker - arm installation cavity. The cutting motor is fixedly installed in the motor installation cavity. The root of the rocker - arm housing is rotatably supported in the rocker - arm installation cavity. The output shaft of the cutting motor is connected to the rear - stage transmission system through the front - stage transmission system. The input end of the rear - stage transmission system is provided with a large gear and a planetary mechanism coaxially connected in sequence. The large gear and the planetary mechanism are arranged in the cavity at the root of the rocker - arm housing. The axis of the large gear is coaxial with the rotation center of the root of the rocker - arm housing. The two ends of the oil cylinder are respectively hinged to the rocker - arm housing and the static housing. The axis of the large gear and the hinge axes at both ends of the oil cylinder both extend in the front - rear direction. The rocker - arm housing further includes a head and a neck between the head and the root. The rocker - arm housing presents a concave - shaped structure with both the head and the root protruding forward relative to the neck. The large gear, the planetary mechanism and a fixed - axis gear transmission structure form the rear - stage transmission system, and the fixed - axis gear transmission structure is located in the cavities of the neck and the head.

2. The wide - adaptability cutting system for a thin - seam coal shearer according to claim 1, characterized in that: The output end of the front - stage transmission system uses a small gear and an intermediate gear set that are externally meshed with each other. The intermediate gear set is externally meshed with the large gear. The intermediate gear set includes an eccentric shaft, an eccentric sleeve, a bearing and an intermediate gear. The eccentric shaft includes reference shaft segments at both ends and an eccentric shaft segment in the middle. On the surface of the eccentric shaft segment, an outer eccentric groove and an inner eccentric groove that extend axially and are closed at both ends are respectively provided at the positions farthest and closest to the axis of the reference shaft segment. On the wall of the hole of the eccentric sleeve, a key groove that extends axially and is not closed at both ends is provided at the thickest part of the wall thickness. The eccentric sleeve is sleeved on the eccentric shaft segment. The key groove is paired with the outer eccentric groove or the inner eccentric groove and forms a key connection with a key between the eccentric shaft and the eccentric sleeve. The reference shaft segments at both ends of the eccentric shaft are both fixed on the static housing. The intermediate gear is installed on the outer cylindrical surface of the eccentric sleeve through the bearing. The intermediate gear is located between the small gear and the large gear and is externally meshed with them respectively. The axes of the small gear, the intermediate gear and the large gear are located in the same plane. The eccentric shaft has two optional installation positions, which are the positions where the outer eccentric groove and the inner eccentric groove are closest to the axis of the large gear.

3. The wide - adaptability cutting system for a thin - seam coal shearer according to claim 2, characterized in that: At least one outer end surface of the reference shaft segment is provided with a key groove.

4. The wide - adaptability cutting system for a thin - seam coal shearer according to claim 2, characterized in that: A housing notch is provided on the common sidewall between the rocker arm mounting cavity and other adjacent cavities on the stationary housing. A rocker arm housing notch is provided on the root sidewall of the rocker arm housing. In the installed state, the rocker arm housing notch always has a partially overlapping area with the housing notch in the circumferential direction. The intermediate gear set and the large gear are kept meshing in the overlapping area of the housing notch and the rocker arm housing notch.

5. The wide adaptability cutting system for thin coal seam shearer according to claim 4, characterized in that: A bearing seat is further fixed on the inner wall of the cavity at the root of the rocker arm housing near the large gear. The input shaft diameter of the large gear is supported on the inner wall of the bearing seat through a bearing. A bearing seat notch is provided on the sidewall of the bearing seat. The circumferential position and size of the bearing seat notch are the same as those of the rocker arm housing notch.

6. The wide adaptability cutting system for thin coal seam shearer according to claim 1, 2, 3, 4 or 5, characterized in that: A guard plate is installed on the stationary housing. The stationary housing, the rocker arm housing and the guard plate together enclose a closed cavity, and the oil cylinder is located in the closed cavity.

7. The wide adaptability cutting system for thin coal seam shearer according to claim 1, 2, 3, 4 or 5, characterized in that: When the stationary housing is used for a shearer, there are at least the following four structural forms. Structural form one: It is divided into a left stationary housing and a right stationary housing. The structures of the left stationary housing and the right stationary housing are symmetric left and right. A single stationary housing is provided with a motor mounting cavity and a rocker arm mounting cavity. Structural form two: A single stationary housing is provided with a motor mounting cavity and two rocker arm mounting cavities. The motor mounting cavity is arranged in the middle left and right, and other structures are symmetrically arranged left and right. Structural form three: A single stationary housing is provided with two motor mounting cavities and two rocker arm mounting cavities. The stationary housing is a symmetric structure left and right. The two motor mounting cavities are located in the middle of the stationary housing in the left and right directions. An additional independent cavity may or may not be provided between the two motor mounting cavities. Structural form four: There is only one stationary housing. A single stationary housing is provided with a motor mounting cavity and a rocker arm mounting cavity.

8. The wide adaptability cutting system for thin coal seam shearer according to claim 6, characterized in that: When the stationary housing is used for a shearer, there are at least the following four structural forms. Structural form one: It is divided into a left stationary housing and a right stationary housing. The structures of the left stationary housing and the right stationary housing are symmetric left and right. A single stationary housing is provided with a motor mounting cavity and a rocker arm mounting cavity. Structural form two: A single stationary housing is provided with a motor mounting cavity and two rocker arm mounting cavities. The motor mounting cavity is arranged in the middle left and right, and other structures are symmetrically arranged left and right. Structural form three: A single stationary housing is provided with two motor mounting cavities and two rocker arm mounting cavities. The stationary housing is a symmetric structure left and right. The two motor mounting cavities are located in the middle of the stationary housing in the left and right directions. An additional independent cavity may or may not be provided between the two motor mounting cavities. Structural form four: There is only one stationary housing. A single stationary housing is provided with a motor mounting cavity and a rocker arm mounting cavity.

9. The wide adaptability cutting system of the thin coal seam shearer as described in claim 7, characterized in that: a positioning and connecting structure is provided on the outer side wall of the stationary housing.

10. The wide adaptability cutting system of the thin coal seam shearer as described in claim 9, characterized in that: the positioning and connecting structure is arranged on the rear outer wall of the stationary housing and includes a positioning hole and a fastening hole.

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