Adjustment Method for Shearer Mining Height and Undercutting Amount, Easily Replaceable Adjustment Block and Installation Structure of Shearer Rocker Arm

Abstract

The present invention relates to a method for adjusting the cutting height and the undercut amount of a shearer, an easily replaceable adjusting block, and a shearer rocker arm mounting structure. An oil cylinder connection hole and an oil cylinder seat connection hole with axes extending forward and backward are provided on the adjusting block. The mutually perpendicular side surface and bottom surface of the adjusting block serve as two positioning surfaces. The distances from the axis of the oil cylinder seat connection hole to the bottom surface and this side surface are respectively equal to the distances from the seat hole of the oil cylinder seat on the machine body to the adjacent top surface and side surface of the machine body. During use, the adjusting block is fixed on the oil cylinder seat, the height-adjusting oil cylinder is hinged on the adjusting block, and the two positioning surfaces of the adjusting block are respectively abutted against the top surface and the side surface of the machine body. By switching between installing and not installing the adjusting block and installing adjusting blocks of different specifications, the hinged position of the height-adjusting oil cylinder of the shearer relative to the machine body is translated, so as to realize the adjustment of the cutting height and the undercut amount. The present invention can meet the mining requirements of multiple working faces with different but similar geological conditions with almost no need to replace traditional shearer components, and has better adaptability and economy.

Description

Technical Field

[0001] The present invention relates to a method for adjusting the cutting height and floor cutting amount of a shearer and an intermediate structural member required for implementing this method. Background Art

[0002] China is rich in coal reserves, and the shearer is the main equipment for coal mining in fully mechanized mining faces. In order to adapt to coal seams of different thicknesses, for shearers of the same model, generally, the cutting height requirements of different working faces are met by changing the length of the rocker arm, the height of the traveling box, the stroke of the height adjustment cylinder, etc., so as to improve the adaptability of the shearer. For shearer manufacturers, this method requires designing and producing more types and more specifications of parts, resulting in relatively high production costs and management costs. For mining enterprises, after mining one working face, before mining another working face with similar geological conditions, more shearer parts also need to be replaced. Moreover, these parts to be replaced are relatively large, inconvenient to install and disassemble, and even more difficult to adjust. Not only is the transformation cycle long, but also the production cost is high. Summary of the Invention

[0003] The present invention aims to provide a method for adjusting the cutting height and floor cutting amount of a shearer, an easily replaceable adjustment block, and a shearer rocker arm installation structure, which can meet the mining requirements of multiple working faces with different but similar geological conditions by replacing fewer and smaller parts. Moreover, the parts to be replaced have a simple structure and are easy to install and disassemble. Therefore, the types and quantities of shearer parts for production and management are reduced, the time for mining enterprises to replace parts is significantly shortened, the production cost and management cost are significantly reduced, and the adaptability and economic performance of the shearer are significantly improved.

[0004] The main technical solutions of the present invention are as follows:

[0005] A method for adjusting the cutting height and the undercut depth of a shearer. Without changing the original specifications of the shearer's rocker arm and the original stroke of the shearer's height-adjusting cylinder, the position of the height-adjusting cylinder of the shearer relative to the hinge axis of the shearer body is translated. The first operation mode is to switch between directly hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body and hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body with the aid of an adjusting block. The second operation mode is to switch between hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body with the aid of adjusting blocks of different specifications. The adjusting block is provided with an oil cylinder connection hole and an oil cylinder seat connection hole whose axes extend front and back. One side of the adjusting block parallel to the oil cylinder seat connection hole is perpendicular to the bottom surface, and this side and the bottom surface are used as two positioning surfaces of the adjusting block. The distances from the axis of the oil cylinder seat connection hole to the bottom surface and the side surface are respectively equal to the distances from the seat hole of the oil cylinder seat to the top surface and the side surface of the adjacent shearer body. For adjusting blocks of different specifications, at least one of the center distances in the horizontal and vertical directions between the oil cylinder connection hole and the oil cylinder seat connection hole is not equal. The so-called hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body with the aid of an adjusting block means fixedly installing the adjusting block on the cylinder seat, making the oil cylinder seat connection hole coaxial with the seat hole of the cylinder seat, and hinging one end of the height-adjusting cylinder on the adjusting block with the axis of the oil cylinder connection hole as the hinge axis.

[0006] When the adjusting block is in the installed state, the adjusting block and the oil cylinder seat are hinged by a pin shaft, and the bottom surface and the side surface serving as the positioning surface of the adjusting block are respectively in contact with the top surface and the side surface of the shearer body.

[0007] It is also possible to simultaneously cooperate with adjusting the stroke of the height-adjusting cylinder.

[0008] An easily replaceable adjusting block for implementing the above adjustment method, which is provided with an oil cylinder connection hole and an oil cylinder seat connection hole whose axes extend front and back. One side of the adjusting block parallel to the oil cylinder seat connection hole is perpendicular to the bottom surface, and this side and the bottom surface are used as two positioning surfaces of the adjusting block. The distances from the axis of the oil cylinder seat connection hole to the bottom surface and the side surface are respectively equal to the distances from the seat hole of the oil cylinder seat on the shearer body to the top surface and the side surface of the adjacent shearer body.

[0009] Multiple adjusting blocks of different specifications form a set of adjustment kits. In a set of adjustment kits, at least one of the center distances in the horizontal and vertical directions between the oil cylinder connection holes and the oil cylinder seat connection holes of any two adjusting blocks is not equal. The distances from the axes of the oil cylinder seat connection holes of all the adjusting blocks to the bottom surface are equal, and the distances from the axes of the oil cylinder seat connection holes of all the adjusting blocks to the side surface serving as the positioning surface are equal.

[0010] The oil cylinder connection hole and the oil cylinder seat connection hole are located at the left and right parts of the adjustment block respectively. The left part can be either a single-ear structure or a double-ear structure, and the right part can be either a single-ear structure or a double-ear structure.

[0011] There is a height difference between the oil cylinder connection hole and the oil cylinder seat connection hole.

[0012] A rocker arm mounting structure of a shearer includes a rocker arm, a height-adjusting oil cylinder, a shearer body, and the easily replaceable adjustment block. The adjustment block is hinged to the oil cylinder seat on the shearer body through a pin shaft. The pin shaft passes through the oil cylinder seat connection hole and the seat hole of the oil cylinder seat. The bottom surface and the side surface of the adjustment block serving as the positioning surfaces are respectively abutted against the top surface and the side surface of the shearer body. One end of the height-adjusting oil cylinder is hinged to the adjustment block with the axis of the oil cylinder connection hole as the hinge axis. The oil cylinder connection hole is farther away from the shearer body to the left or right compared with the oil cylinder seat connection hole. One end of the rocker arm is hinged to the body at one place and the other end of the height-adjusting oil cylinder at another place.

[0013] The end of the height-adjusting oil cylinder hinged to the adjustment block adopts a single-ear structure or a double-ear structure, and the oil cylinder seat adopts a single-ear structure or a double-ear structure.

[0014] The beneficial effects of the present invention are as follows:

[0015] Compared with a shearer without an adjustment block, when the shearer does not need the maximum cutting height, the adjustment block of the present invention can be added between the height-adjusting oil cylinder and the body to meet the cutting height requirements of lower coal seams. It can prevent the shearer from cutting the top beam of the hydraulic support due to the undulation of the working face. Therefore, the adjustment block also functions as a limit block.

[0016] By adopting the adjustment method of the present invention or the rocker arm mounting structure of the present invention on the shearer, when the mine needs to adjust the cutting height and the amount of floor penetration according to the coal seam geological conditions, only the size of the adjustment block needs to be changed, and there is no need to replace the rocker arm or the height-adjusting oil cylinder. This greatly shortens the transformation time of the shearer, saves costs, significantly improves the economy, and also greatly improves the adaptability.

[0017] By adding the adjustment block, the present invention makes the hinge point of the oil cylinder move towards the rocker arm direction, avoiding the interference between the height-adjusting oil cylinder barrel and the top of the body shell when the original height-adjusting oil cylinder extends, and reducing or avoiding the limitation on increasing the amount of floor penetration of the shearer. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the shearer when the adjustment block is applied to the shearer;

[0019] Figure 2 It is Figure 1 The enlarged view I of

[0020] Figure 3 is a front view of an embodiment of the adjustment block of the present invention;

[0021] Figure 4 1 is a top view of multiple embodiments of the adjustment block of the present invention.

[0022] Reference numerals:

[0023] 1. Left rocker arm; 2. Heightening cylinder; 3. Left adjustment block; 3'. Right adjustment block; 4. Left traction box; 5. Middle electric control box; 6. Right traction box; 7. Travel box; 8. Right rocker arm. DETAILED DESCRIPTION

[0024] like Figures 1-4 As shown, the present invention discloses a method for adjusting the mining height and the amount of lying on the ground of a coal mining machine. Under the condition of keeping the original specifications of the coal mining machine rocker arm and the original stroke of the coal mining machine height adjustment cylinder unchanged, the position of the articulation axis of the coal mining machine height adjustment cylinder relative to the coal mining machine body is translated, or in other words, the articulation position of the height adjustment cylinder relative to the coal mining machine body is changed without changing the articulation direction.

[0025] The first operating method is to convert between directly hingedly connecting one end of the height adjustment cylinder 2 to the cylinder seat on the coal mining machine body and hingedly connecting one end of the height adjustment cylinder 2 to the cylinder seat on the coal mining machine body with the aid of the adjustment block 3, that is, converting the height adjustment cylinder from being directly connected to the coal mining machine body to being connected to the coal mining machine body via the adjustment block, or vice versa, provided that the position where the adjustment block is installed on the coal mining machine body is the same as the installation position when the height adjustment cylinder is directly installed.

[0026] The second operation mode is to switch between hingedly connecting one end of the height adjustment cylinder 2 to the cylinder seat on the coal mining machine body by means of adjustment blocks 3 of different specifications, that is, the height adjustment cylinder is also connected to the coal mining machine body via the adjustment block, but the adjustment block of one specification is changed to another specification. Similarly, no matter which specification of the adjustment block is changed, the position of installing the adjustment block on the coal mining machine body is the same as the installation position when the height adjustment cylinder is directly installed.

[0027] The so-called hinged connection of one end of the height adjustment cylinder to the cylinder seat on the coal mining machine body by means of an adjustment block means that the adjustment block is fixedly installed on the cylinder seat, the cylinder seat connection hole is coaxial with the seat hole of the cylinder seat, and one end of the height adjustment cylinder is hinged on the adjustment block, with the axis of the cylinder connection hole as the hinge axis. After installation, the adjustment block can be regarded as a part of the extended structure of the coal mining machine body.

[0028] A side surface A of the adjustment block parallel to the connecting hole of the oil cylinder seat is perpendicular to the bottom surface B of the adjustment block, and the side surface A and the bottom surface B are used as two positioning surfaces when the adjustment block is installed. The distances L4 and L3 from the axis of the connecting hole of the oil cylinder seat to the bottom surface and the side surface are respectively equal to the distances from the seat hole of the oil cylinder seat to the top surface and the side surface of the coal mining machine body adjacent thereto. The oil cylinder seat is a fixed structure attached to the coal mining machine body, which is used to directly hinge one end of the height adjustment oil cylinder 2. The diameter of the connecting hole of the oil cylinder seat on the adjustment block and the positioning dimensions L3 and L4 of the hole are designed according to the structural dimensions and position dimensions of the oil cylinder seat, that is, for a given coal mining machine, the diameter and dimensions L3 and L4 of the connecting hole of the oil cylinder seat are determined. The adjustment block can be directly used without changing the original structure of the coal mining machine body. Therefore, the adjustment method with the use of the adjustment block as the core of the present invention does not require design changes to the original parts of the coal mining machine, nor does it require the design and production of coal mining machine parts of various specifications, thereby saving a lot of production costs and management costs.

[0029] The so-called specification of the adjustment block mainly refers to the horizontal center distance L1 and the vertical center distance L2 of the cylinder connection hole and the cylinder seat connection hole. Adjustment blocks of different specifications have at least one of the horizontal and vertical center distances of the cylinder connection hole and the cylinder seat connection hole being different.

[0030] When the adjustment block is in the installed state, the adjustment block is hinged to the oil cylinder seat through a pin, and the bottom surface B of the adjustment block and the side surface A as the positioning surface are respectively fitted with the top surface and the side surface of the coal mining machine body. The top surface and the side surface structure at right angles to each other on the coal mining machine body near the oil cylinder seat are used to limit the rotation of the adjustment block, so that the adjustment block is fixed without shaking.

[0031] For example, in the absence of an adjustment block, by adding L2 equal to zero Figure 1 This type of adjustment block can make the hinge point of the height adjustment cylinder move horizontally toward the rocker arm. When the structures and parameters of other adjacent parts remain unchanged, the upward swing angle of the rocker arm on the corresponding side will become smaller after the adjustment block is installed, so the mining height H1 becomes smaller, so it can prevent the coal mining machine from cutting the top beam of the hydraulic support due to the ups and downs of the working surface. At this time, the adjustment block also plays the role of a limit block. After installing the adjustment block, the maximum mining height of the coal mining machine is reduced, and the corresponding coal mining machine can adapt to the lower thickness of the coal seam. At the same time, it can also avoid or reduce the interference between the height adjustment cylinder barrel and the top of the fuselage shell when the piston rod of the height adjustment cylinder is extended to a certain extent, avoiding the restriction on increasing the bottom amount H2 of the coal mining machine, that is, the downward swing angle of the rocker arm on the corresponding side will become larger, so the bottom amount H2 becomes larger.

[0032] For another example, replacing the adjusting block with the oil cylinder connection hole and the oil cylinder seat connection hole at the same height with an adjusting block where the oil cylinder connection hole is higher than the oil cylinder seat connection hole can also avoid, to a certain extent, the interference between the cylinder barrel of the height-adjusting oil cylinder and the top of the fuselage shell when the piston rod of the height-adjusting oil cylinder extends, so the undercut amount can be increased.

[0033] It can be seen that when the coal seam thickness H1 that the shearer needs to satisfy varies within a certain range, the values of the mining height H1 and the undercut amount H2 can be adjusted by changing the dimensions of L1 and L2 of the adjusting block 3, that is, by replacing adjusting blocks of different specifications, so as to meet the mining requirements of the shearer. Compared with the existing method of adjusting the values of the mining height H1 and the undercut amount H2 by designing rocker arms, traction boxes, height-adjusting oil cylinders, etc. of different specifications, the cost and time of wooden mold casting can be significantly saved.

[0034] On the basis of switching between installing or not installing the adjusting block or replacing adjusting blocks of different specifications, some relatively simple or relatively low-cost measures existing in the art can also be additionally adopted to achieve a greater range of adjustment of the mining height and the undercut amount of the shearer. For example, the stroke of the height-adjusting oil cylinder can also be adjusted simultaneously. Since there is no need to design, manufacture, and manage a large number of rocker arms, fuselages, etc. with different structures and specifications as replaceable spare parts, the adjustment method of the present invention has high economy.

[0035] The present invention significantly improves the adaptability of the shearer to mining in different working faces, with different mining heights and undercut requirements. At the same time, compared with the existing technical solutions for meeting adaptability, the economy is also significantly improved.

[0036] The present invention also discloses an easily replaceable adjusting block, which is the core structural part for implementing the above adjustment method. As Figure 3 、 4 shown, it is provided with an oil cylinder connection hole and an oil cylinder seat connection hole with axes extending forward and backward. Both the oil cylinder connection hole and the oil cylinder seat connection hole are through holes, which are respectively used for hinging with the height-adjusting oil cylinder and the oil cylinder seat on the shearer fuselage. A side surface A of the adjusting block parallel to the oil cylinder seat connection hole is perpendicular to the bottom surface B. The side surface A and the bottom surface B serve as two positioning surfaces of the adjusting block, and the edge between them can be chamfered so that the two positioning surfaces can fit well with the corresponding reference installation surfaces. The distances L4 and L3 from the axis of the oil cylinder seat connection hole to the bottom surface B and the side surface A are respectively equal to the distances from the seat hole of the oil cylinder seat on the shearer fuselage to the top surface and the side surface of the adjacent shearer fuselage. The top surface and the side surface of the shearer fuselage near the oil cylinder seat are the reference installation surfaces.

[0037] The adjusting block can be a flat plate.

[0038] The adjustment block is mainly used to adjust the connection between the lifting cylinder and the shearer body. Usually, the left and right lifting cylinders of the shearer are respectively connected to the shearer body through a pair of symmetrically arranged adjustment blocks on the left and right.

[0039] To implement the above second operation mode, more than one specification of adjustment blocks are required. In this case, a complete set of adjustment kits composed of multiple adjustment blocks with different specifications usually needs to be prepared. In a set of adjustment kits, at least one of the horizontal center distance L1 and the vertical center distance L2 between the cylinder connection holes and the cylinder seat connection holes of two adjacent adjustment blocks is not equal. The distance L4 from the axis of the cylinder seat connection hole of all adjustment blocks to the bottom surface B is equal, and the distance L3 from the axis of the cylinder seat connection hole of all adjustment blocks to the side surface A as the positioning surface is equal. Two identical sets of adjustment kits need to be configured for the left and right rocker arms of a double-drum shearer.

[0040] One of the cylinder connection hole and the cylinder seat connection hole penetrates the left part of the adjustment block, and the other penetrates the right part of the adjustment block. The left part can be any one of a single-ear structure and a double-ear structure, and the right part can also be any one of a single-ear structure and a double-ear structure to meet the single-ear or double-ear structures of the left and right lifting cylinders and the left and right cylinder seats. As Figure 4 shown, where a and c represent that the left part is a single-ear structure, b and d represent that the left part is a double-ear structure, a and b represent that the right part is a single-ear structure, and c and d represent that the right part is a double-ear structure. For example, when the connection ends of the left lifting cylinder and the left cylinder seat both adopt double-ear structures, the adjustment block shown in a of Figure 4 can be used, that is, the adjustment block with a single-ear structure for both the left and right parts.

[0041] Although the through holes located on the double-ear structure are separated into two sections in the front and back, they are still regarded as one through hole.

[0042] The center distance between the cylinder connection hole and the cylinder seat connection hole in the left-right direction is L1, and the center distance in the up-down direction is L2. L1 is not equal to zero. L2 can be equal to zero, but L2 is preferably not equal to zero, that is, there is preferably a height difference between the two through holes. The value of L2 is usually determined according to the coal seam thickness according to the design requirements.

[0043] The present invention also discloses a mounting structure for a shearer rocker arm, which includes a rocker arm 1 or 8, a height-adjusting cylinder 2, a shearer body (including a left traction box 4, an intermediate electric control box 5, and a right traction box 6), and the replaceable and adjustable block 3 or 3'. The adjusting block is hinged to the cylinder seat on the shearer body through a pin shaft. The pin shaft passes through the connection hole of the cylinder seat and the seat hole of the cylinder seat. The bottom surface and the side surface of the adjusting block serving as the positioning surfaces are respectively abutted against the top surface and the side surface of the shearer body. One end of the height-adjusting cylinder is hinged to the adjusting block through a pin shaft, and the axis of the cylinder connection hole is used as the hinge axis. One end of the rocker arm is hinged to the body at one place, and the other end is hinged to the other end of the height-adjusting cylinder.

[0044] Compared with the existing rocker arm mounting structure, this mounting structure only adds an adjusting block, and can easily change the cutting height and undercutting of the shearer, and does not need to change the structures and dimensions of the original relevant components such as the rocker arm, the height-adjusting cylinder, and the shearer body. Moreover, the structure of the adjusting block is simple, easy to process, and has strong adaptability.

[0045] The adjusting block is positioned in a plane through the vertical side surface A and the bottom surface B, which can prevent the adjusting block from rotating during the adjustment of the height-adjusting cylinder, or the adjusting block from moving after being subjected to the reverse cutting load during the coal cutting operation of the shearer.

[0046] When this mounting structure is applied to a drum shearer, reference can be made to Figure 1 、 2 , the left rocker arm 1 and the right rocker arm 8 are respectively connected through the height-adjusting cylinder 2, and different cutting heights H1 and undercutting amounts H2 of the shearer are achieved by the telescopic movement of the height-adjusting cylinder 2. The traveling box 7 is respectively connected to the left traction box 4 and the right traction box 6 through bolt fasteners. The traction box is a part of the shearer body. The left and right height-adjusting cylinders 2 are respectively connected to the left traction box 4 and the right traction box 6 through the left adjusting block 3 and the right adjusting block 3' correspondingly.

[0047] Furthermore, the end of the height-adjusting cylinder hinged to the adjusting block can adopt a single-ear structure or a double-ear structure, and the cylinder seat can also adopt a single-ear structure or a double-ear structure. Generally, when the end of the height-adjusting cylinder hinged to the adjusting block is a single-ear structure, the corresponding connecting end of the adjusting block adopts a double-ear structure; when the end of the height-adjusting cylinder hinged to the adjusting block is a double-ear structure, the corresponding connecting end of the adjusting block adopts a single-ear structure. Similarly, when the cylinder seat adopts a single-ear structure, the corresponding connecting end of the adjusting block adopts a double-ear structure; when the cylinder seat adopts a double-ear structure, the corresponding connecting end of the adjusting block adopts a double-ear structure.

[0048] Generally, the cylinder connection hole is located to the left or right away from the shearer body compared with the cylinder seat connection hole. For example, for the left height-adjusting cylinder, the cylinder connection hole of the adopted adjusting block is on the left, and the cylinder seat connection hole is on the right.

Claims

1. A method for adjusting the cutting height and the undercut amount of a shearer, characterized in that: Without changing the original specifications of the shearer rocker arm and the original stroke of the shearer height-adjusting cylinder, the position of the shearer height-adjusting cylinder relative to the hinge axis of the shearer body is translated. The first operation method is to switch between directly hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body and hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body with the help of an adjustment block. The second operation method is to switch between hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body with the help of adjustment blocks of different specifications. The adjustment block is provided with an oil cylinder connection hole and an oil cylinder seat connection hole whose axes extend forward and backward. One side of the adjustment block parallel to the oil cylinder seat connection hole is perpendicular to the bottom surface. This side and the bottom surface serve as two positioning surfaces of the adjustment block. The distances from the axis of the oil cylinder seat connection hole to the bottom surface and this side are respectively equal to the distances from the seat hole of the oil cylinder seat on the shearer body to the top surface and the side surface of the adjacent shearer body. For adjustment blocks of different specifications, at least one of the horizontal and vertical center distances between the oil cylinder connection hole and the oil cylinder seat connection hole is not equal. The so-called hinging one end of the height-adjusting cylinder on the cylinder seat of the shearer body with the help of an adjustment block means fixedly installing the adjustment block on the cylinder seat, making the oil cylinder seat connection hole coaxial with the seat hole of the cylinder seat, and hinging one end of the height-adjusting cylinder on the adjustment block with the axis of the oil cylinder connection hole as the hinge axis.

2. The method for adjusting the cutting height and floor penetration of a shearer according to claim 1, characterized in that: When the adjustment block is in the installed state, the adjustment block and the cylinder seat are hinged by a pin shaft. The bottom surface of the adjustment block and the side surface serving as the positioning surface are respectively in contact with the top surface and the side surface of the shearer body.

3. The method for adjusting the cutting height and floor penetration of a coal shearer according to claim 1 or 2, characterized in that: At the same time, the stroke of the height-adjusting cylinder is adjusted accordingly.

4. An easily replaceable adjustment block for implementing the adjustment method of the cutting height and floor penetration of a shearer according to claim 1, 2 or 3, characterized in that: It is provided with an oil cylinder connection hole and an oil cylinder seat connection hole whose axes extend forward and backward. One side of the adjustment block parallel to the oil cylinder seat connection hole is perpendicular to the bottom surface. This side and the bottom surface serve as two positioning surfaces of the adjustment block. The distances from the axis of the oil cylinder seat connection hole to the bottom surface and this side are respectively equal to the distances from the seat hole of the oil cylinder seat on the shearer body to the top surface and the side surface of the adjacent shearer body.

5. The replaceable adjustment block according to claim 4, characterized in that: Multiple adjustment blocks of different specifications form a set of adjustment kits. In a set of adjustment kits, at least one of the horizontal and vertical center distances between the oil cylinder connection holes and the oil cylinder seat connection holes of any two adjustment blocks is not equal. The distances from the axes of the oil cylinder seat connection holes of all adjustment blocks to the bottom surface are equal. The distances from the axes of the oil cylinder seat connection holes of all adjustment blocks to the side surface serving as the positioning surface are equal.

6. The replaceable adjustment block according to claim 5, characterized in that: One of the oil cylinder connection hole and the oil cylinder seat connection hole is located in the left part of the adjustment block, and the other is located in the right part of the adjustment block. The left part can be any one of a single-ear structure and a double-ear structure, and the right part can be any one of a single-ear structure and a double-ear structure.

7. The replaceable adjustment block according to claim 4, 5 or 6, characterized in that: There is a height difference between the oil cylinder connection hole and the oil cylinder seat connection hole.

8. A mounting structure for a shearer rocker arm, characterized in that: It includes a rocker arm, a height-adjusting oil cylinder, a coal shearer body, and the easily replaceable adjustment block described in claim 4, 5, 6 or 7. The adjustment block is hinged to an oil cylinder seat on the coal shearer body through a pin shaft. The pin shaft passes through the connection hole of the oil cylinder seat and the seat hole of the oil cylinder seat. The bottom surface and the side surface of the adjustment block serving as the positioning surfaces are respectively abutted against the top surface and the side surface of the coal shearer body. One end of the height-adjusting oil cylinder is hinged to the adjustment block, and the axis of the oil cylinder connection hole is used as the hinge axis. One end of the rocker arm is hinged to the body at one place and the other end of the height-adjusting oil cylinder at another place.

9. The rocker arm mounting structure of the shearer according to claim 8, characterized in that: One end of the height-adjusting oil cylinder hinged to the adjustment block adopts a single-ear structure or a double-ear structure, and the oil cylinder seat adopts a single-ear structure or a double-ear structure.

10. The rocker arm mounting structure of the shearer according to claim 9, characterized in that: The oil cylinder connection hole is left or right away from the coal shearer body compared with the oil cylinder seat connection hole.

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