Position-adjustable rocker arm of mining machine and its installation structure

Abstract

The present invention relates to a position-adjustable rocker arm of a mining machine and its installation structure, which includes a rocker arm body and a transition frame. The rocker arm body and the transition frame are connected and fixed by corresponding multiple connecting ears that are dispersedly arranged up, down, front and back, and then paired and hinged with a first pin shaft and a first adjusting ring. The traction part connecting ear at one end of the transition frame away from the rocker arm body is hinged to the traction part through a second pin shaft, a second adjusting ring, and the traction part, and the oil cylinder connecting ear is hinged to the oil cylinder through a third pin shaft, a third adjusting ring, and the oil cylinder. Each of the first, second, and third adjusting rings has two alternative installation positions, namely, a forward position and a rearward position. The present invention can adjust the front and rear position of the rocker arm relative to the fuselage by adjusting the front and rear installation positions of the adjusting ring, and then change the front and rear distance between the rocker arm and the scraper conveyor. It is not only easy to operate on-site, but also does not require additional replacement of large components, and the adjustment cost is very low, which can improve the adaptability of the mining machine to complex production conditions.

Description

Technical Field

[0001] The present invention relates to a rocker arm of a mining machine and its installation structure, belonging to the technical field of underground mining machinery. Background Art

[0002] A mining machine is an important equipment for underground coal, bauxite and other ore mining. It rides on a scraper conveyor and shuttles back and forth for ore mining and loading. Due to the close cooperation between the two, matching work needs to be carried out before purchasing a mining machine and a scraper conveyor. After the matching drawing is signed, the scraper conveyor and the mining machine will be produced according to the matching drawing. The horizontal distance between the meshing point of the cutting tip of the scraper conveyor and the pin row is fixed and unchanged. The positional relationship between the rocker arm and the fuselage of the traditional mining machine is also fixed and unchanged, resulting in fixed cutting distances and horizontal clearances from the rocker arm to the trough side, which cannot be changed.

[0003] The cutting distance is an important matching parameter, which refers to the distance from the edge of the drum to the tip of the cutting plate of the scraper conveyor, indicating the distance between the drum and the trough side. If the value is too large, it means that the distance from the drum to the trough side of the scraper conveyor is too large, and the loading distance of the drum becomes farther, resulting in poor loading effect. If the value is too small, when the scraper conveyor undergoes horizontal deflection or when the mining machine cuts in a "S" shape, if the drum is just at a low position, the drum is likely to cut the cutting plate, and the internal transmission system of the rocker arm will be impacted, causing damage to internal components and the cutting plate.

[0004] The horizontal clearance from the rocker arm to the trough side is also very important. If it is too small, it will cause interference between the end of the rocker arm housing and the trough side of the scraper conveyor, resulting in jamming of the rocker arm, or the rocker arm will rest on the trough side when it swings down, and the drum cannot lie down, resulting in a small undercut amount or inability to cut through, making it difficult to push the scraper conveyor. If it is too large, it will lead to too large a cutting distance, affecting the loading effect.

[0005] Although the above two parameters are comprehensively considered during matching, in the face of complex underground working environments, equipment wear during use, and inadequate management, etc., in actual use, there is often a need to adjust the cutting distance and the horizontal clearance from the rocker arm to the trough side. The cutting distance and the horizontal clearance from the rocker arm to the trough side that have been fixed during matching are very likely to be insufficient or too large in actual performance. Insufficiency cannot ensure the normal progress of production, and being too large means that the throwing point of the ore is relatively far from the trough side, and the ore is not easily loaded into the chute of the scraper conveyor. Summary of the Invention

[0006] To solve the above problems, the present invention provides a mining machine rocker arm with adjustable position and its installation structure. By changing the installation positions of the adjusting rings between the rocker arm body and the transition frame, and between the transition frame and the oil cylinder and the traction part, the position of the rocker arm relative to the fuselage of the mining machine is changed, and accordingly the cutting distance and the horizontal clearance from the rocker arm to the trough side are changed.

[0007] The main technical solutions of the present invention are:

[0008] A position-adjustable rocker arm for a mining machine comprises a first pin shaft, a first adjusting ring, and a rocker arm body and a transition frame connected thereto. The ends where the rocker arm body and the transition frame are connected are respectively provided with an upper and lower group of transition frame connecting ears and an upper and lower group of rocker arm body connecting ears. The transition frame connecting ears and the rocker arm body connecting ears are matched one by one and are hinged by passing through a first pin shaft. The hinge axis extends forward and backward. One of the first adjusting rings is axially embedded and installed between the transition frame connecting ears and the rocker arm body connecting ears at each matched hinge. The first adjusting ring is sleeved on the first pin shaft. All the first adjusting rings are in the same position relative to the rocker arm body connecting ears in the hinge structure to which they belong.

[0009] A circular flange is provided at one end of the first pin shaft, and the circular flange of the first pin shaft faces the front and rear outer sides of the rocker arm body in the installed state.

[0010] The first adjustment ring is clearance-fitted with the first pin shaft, and a wear-resistant sleeve is respectively installed between the rocker arm body connecting ear and the transition frame connecting ear and the first pin shaft, the wear-resistant sleeve and the ear hole of the corresponding connecting ear are interference-fitted, and the first pin shaft and the wear-resistant sleeve are clearance-fitted.

[0011] One of the rocker arm body connecting ear and the transition frame connecting ear adopts a double-ear structure, and the other adopts a single-ear structure. One end of the wear-resistant sleeve between the first pin shaft and the connecting ear of the double-ear structure is provided with a flange with a circular end face shape. In the installed state, the flange is embedded and installed on the inner end face of the connecting ear of the double-ear structure in the front and rear directions.

[0012] The upper part of one end of the transition frame away from the rocker arm body is also provided with a traction part connecting ear, and the lower part is also provided with an oil cylinder connecting ear.

[0013] A strip-shaped auxiliary loading plate extending along the upper edge is preferably fixedly mounted at the upper edge of the rear end surface of the roller mounting end of the rocker arm body, and the plate surface of the auxiliary loading plate is inclined rearward and downward.

[0014] A position-adjustable rocker arm mounting structure for a mining machine, comprising a traction part, an oil cylinder, a second pin shaft, a second adjusting ring, a third pin shaft, a third adjusting ring and the position-adjustable rocker arm of the mining machine. The connecting ear of the traction part is paired with the rocker arm connecting ear on the traction part and is hinged by passing through the second pin shaft. The hinge axis extends back and forth. A second adjusting ring is axially embedded and installed between the paired and hinged connecting ear of the traction part and the rocker arm connecting ear. The second adjusting ring is sleeved on the second pin shaft. When there are multiple pairs of hinged connecting ears of the traction part and the rocker arm connecting ear, all the second adjusting rings are in the same position relative to the connecting ear of the traction part within their respective hinged structures. The connecting ear of the oil cylinder is hinged with the ear seat at one end of the oil cylinder by passing through the third pin shaft. The hinge axis extends back and forth. The third adjusting ring is sleeved on the third pin shaft and is axially embedded and installed between the two connecting ears of the transition frame and the oil cylinder connected in a paired manner. The thicknesses of the second adjusting ring and the third adjusting ring are equal.

[0015] One of the two connecting ears of all paired and hinged connections adopts a double-ear structure, and the other adopts a single-ear structure.

[0016] When the connecting ears of the transition frame and the oil cylinder both adopt a single-ear structure or a double-ear structure, the first adjusting ring and the third adjusting ring are located on the same side of the connecting ear of the single-ear structure in their respective hinged structures. When one of the connecting ears of the transition frame and the oil cylinder adopts a single-ear structure and the other adopts a double-ear structure, the first adjusting ring and the third adjusting ring are located on the opposite sides of the connecting ear of the single-ear structure in their respective hinged structures; when the connecting ears of the traction part and the oil cylinder both adopt a single-ear structure or a double-ear structure, the second adjusting ring and the third adjusting ring are located on the same side of the connecting ear of the single-ear structure in their respective hinged structures. When one of the connecting ears of the traction part and the oil cylinder adopts a single-ear structure and the other adopts a double-ear structure, the second adjusting ring and the third adjusting ring are located on the opposite sides of the connecting ear of the single-ear structure in their respective hinged structures.

[0017] The beneficial effects of the present invention are as follows:

[0018] For a mining machine adopting the rocker arm of the present invention and its mounting structure, when it is found that the spacing between the shovels and the horizontal clearance between the rocker arm and the trough side are not appropriate during underground use, the installation positions of several adjusting rings can be simply adjusted to increase or decrease the front-back distance between the rocker arm and the scraper conveyor, so that the spacing between the shovels and the horizontal clearance between the rocker arm and the trough side can meet the on-site production requirements. This method is very flexible and easy to operate on site. It does not require replacing large components of the mining machine, adapts to complex production conditions with low cost and simple operation, and realizes safe and reliable production and good loading effects.

[0019] By installing the auxiliary loading plate, the starting point of the coal throwing can be extended and the throwing speed can be increased, guiding more ore flows to slide into the chute of the scraper conveyor, thereby improving the loading effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic structural diagram of an embodiment of the position-adjustable rocker arm of a mining machine according to the present invention;

[0021] Figure 2 is Figure 1 a schematic three-dimensional structure diagram of the rocker arm body described in;

[0022] Figure 3 is Figure 1 a schematic three-dimensional structure diagram of the transition frame described in;

[0023] Figure 4 is Figure 1 a schematic three-dimensional structure diagram of the transition frame described in;

[0024] Figure 5 is Figure 1 a partial cross-sectional view of;

[0025] Figure 6 is Figure 1 a B-B cross-sectional view of;

[0026] Figure 7 FIG. is a schematic diagram of an embodiment of the installation structure of the position-adjustable rocker arm of the mining machine;

[0027] Figure 8 is Figure 1 an A-A cross-sectional view of.

[0028] Reference numerals:

[0029] 10. Position-adjustable rocker arm of mining machine;

[0030] 100. Auxiliary loading plate assembly; 101. Auxiliary loading plate; 102. Screw; 103. Washer;

[0031] 200. Rocker arm body; 201-204. Transition frame connection ears; 205. Front end face of the transition frame connection ear with single-ear structure;

[0032] 300. Transition frame; 301-304. Rocker arm body connection ears; 305-306. Tractive part connection ears; 307. Cylinder connection ear; 308. Front end face of the tractive part connection ear with single-ear structure; 311. Rear end face of the connection ear at one end of the cylinder with single-ear structure;

[0033] 400. First pin shaft;

[0034] 500. First adjusting ring;

[0035] 600. Second pin shaft;

[0036] 700. Second adjusting ring;

[0037] 800. Third pin shaft;

[0038] 900. Third adjusting ring;

[0039] 20. Hauling unit;

[0040] 30. Oil cylinder;

[0041] 40. Drum. Detailed implementation mode

[0042] The present invention discloses a position-adjustable rocker arm 10 of a mining machine, as Figure 1-8 shown, which includes a first pin shaft 400, a first adjusting ring 500, and a connected rocker arm body 200 and a transition frame 300. The rocker arm body and the transition frame form the basic framework of the rocker arm. One end of the rocker arm body away from the transition frame is the installation end of the drum 40. At the ends where the rocker arm body and the transition frame are connected, there are respectively two sets of transition frame connection ears with the same structure up and down and two sets of rocker arm body connection ears with the same structure up and down. The transition frame connection ears and the rocker arm body connection ears are paired one by one and are hinged by passing through the first pin shaft 400. The hinge axis extends back and forth to realize the connection and fixation between the rocker arm body and the transition frame. A first adjusting ring is embedded and installed axially between the transition frame connection ears and the rocker arm body connection ears at each paired hinge. The first adjusting ring is sleeved on the first pin shaft. By selecting which end surface of the connection ear contacts the first adjusting ring in the front and back directions, the first adjusting ring can have two possible installation positions, namely, forward and backward. All the first adjusting rings are in the same position relative to the rocker arm body connection ears within their respective hinge structures. By changing the front and back installation positions of the first adjusting rings, the front and back relative positions of the rocker arm body and the transition frame will change, and the changed distance is equal to the thickness of the first adjusting ring. With the position of the transition frame unchanged, by changing the installation position of the first adjusting ring, the distance of the rocker arm body relative to the scraper conveyor in the front and back directions can be changed, thereby realizing the adjustment of the cutting spacing and the horizontal clearance between the rocker arm and the trough side.

[0043] In this embodiment, each set of transition frame connection ears includes two connection ears arranged coaxially at intervals in the front and back, a total of four transition frame connection ears 201-204. Each set of rocker arm body connection ears also includes two connection ears arranged coaxially at intervals in the front and back, a total of four rocker arm body connection ears 301-304. Therefore, there are four hinge structures at the connection between the rocker arm body and the transition frame.

[0044] One end of the first pin shaft is provided with a circular flange. In the installed state, the circular flange of the first pin shaft faces the front and back outer sides of the rocker arm body.

[0045] The first adjusting ring 500 is in clearance fit with the first pin shaft 400. Wear-resistant sleeves are respectively installed between the connecting ears 301-304 of the rocker arm body and the connecting ears 201-204 of the transition frame and the first pin shaft. The wear-resistant sleeves are installed in the ear holes of the corresponding connecting ears by interference fit, and the first pin shaft and the wear-resistant sleeves are in clearance fit. The wear-resistant sleeves can protect the ear holes of the connecting ears from wear and can be replaced when worn.

[0046] One of the connecting ears of the rocker arm body and the connecting ears of the transition frame adopts a double-ear structure, and the other adopts a single-ear structure. One end of the wear-resistant sleeve between the first pin shaft and the connecting ear with the double-ear structure can be provided with a flanging with a circular end face shape, and in the installed state, the flanging is inlaid on the inner end face in the front-rear direction of the connecting ear with the double-ear structure (that is, the end face where the two ear seats face each other). The wear-resistant sleeve between the first pin shaft and the connecting ear with the single-ear structure is a straight cylindrical structure without flanging at both ends.

[0047] At the upper part of one end of the transition frame far from the rocker arm body, there are traction part connecting ears (in this embodiment, there are two traction part connecting ears 305, 306), which are used to connect with the housing of the mining machine traction part 20, and at the lower part, there is an oil cylinder connecting ear (in this embodiment, there is one oil cylinder connecting ear 307), which is used to connect with one end of the oil cylinder 30.

[0048] As Figure 8 shown, the position-adjustable rocker arm of the mining machine preferably further includes an auxiliary loading plate assembly 100. The auxiliary loading plate assembly includes an auxiliary loading plate 101, screws 102 for fixing the auxiliary loading plate, and washers 103. The strip-shaped auxiliary loading plate 100 is fixed along the upper edge of the rear end face of the roller installation end of the rocker arm body. The plate surface of the auxiliary loading plate is inclined backward and downward. The included angle between the plate surface of the auxiliary loading plate and the top surface of the rocker arm body is α, and the value range of α is preferably 15-30°. The auxiliary loading plate is installed at the rear side of the rocker arm end housing, which can extend the sliding distance of the ore on the housing, drop at a position closer to the chute wall, and through a certain installation angle α, make the ore have a faster dropping speed and is easier to enter the chute. It can be seen that under the guidance of the auxiliary loading plate, the loading effect of the mining machine can be significantly improved.

[0049] The present invention also discloses a position-adjustable installation structure of the rocker arm of the mining machine, which can be referred to Figure 7, including a traction part 20, a cylinder 30, a second pin 600, a second adjustment ring 700, a third pin 800, a third adjustment ring 900 and the position-adjustable mining machine rocker arm 10. The traction part connecting ear is matched with the rocker arm connecting ear on the traction part and is hinged by penetrating the second pin 600, and the hinge axis extends forward and backward. A second adjustment ring 700 is axially embedded and installed between the paired hinged traction part connecting ear and the rocker arm connecting ear, and the second adjustment ring is sleeved on the second pin. When the traction part connecting ear and the rocker arm connecting ear are paired and hinged at multiple locations (two locations in this embodiment), all the second adjustment rings are at the same position relative to the traction part connecting ear in the hinged structure to which they belong. The cylinder connecting ear is hinged with the ear seat on one end of the cylinder by penetrating the third pin 800, and the hinge axis extends forward and backward. The third adjustment ring 900 is sleeved on the third pin and is axially embedded and installed between the two connecting ears matched and connected between the transition frame and the cylinder. The thickness of the second adjustment ring is equal to that of the third adjustment ring.

[0050] The other end of the oil cylinder is hinged to the body of the mining machine. The oil cylinder is extended and retracted, driving the position-adjustable rocker arm of the mining machine to swing relative to the body. The second adjustment ring and the third adjustment ring have two possible installation positions, front and rear, in their respective hinged structures. By adjusting the installation positions of the second adjustment ring and the third adjustment ring, the front and rear installation positions of the transition frame relative to the body of the mining machine can be changed, and one more level of adjustment is added to change the distance of the rocker arm body relative to the scraper conveyor in the front and rear directions, so that a wider range of adjustment of the shovel spacing and the horizontal gap from the rocker arm to the trough side can be achieved.

[0051] In all the above-mentioned hinged structures, one of the two connecting ears of all paired hinged connections preferably adopts a double-ear structure and the other adopts a single-ear structure. That is, in the installed state, the connecting ear of the single-ear structure and the corresponding adjustment ring are embedded side by side between the two ear seats of the connecting ear of the double-ear structure. The adjustment ring can only be installed in front of or behind the connecting ear of the single-ear structure and is located between the two inner end surfaces of the connecting ear of the double-ear structure.

[0052] When the transition frame connecting ear 201-204 and the oil cylinder connecting ear 307 both adopt a single ear structure or a double ear structure, the first adjustment ring 500 and the third adjustment ring 900 are located on the same side of the connecting ear of the single ear structure in their respective hinged structures; when the transition frame connecting ear 201-204 and the oil cylinder connecting ear 307 adopt a single ear structure and the other adopt a double ear structure, the first adjustment ring 500 and the third adjustment ring 900 are located on the opposite sides of the connecting ear of the single ear structure in their respective hinged structures. For example, in this embodiment, the transition frame connecting ear and the oil cylinder connecting ear adopt a single ear structure and a double ear structure respectively, the first adjustment ring 500 is attached to the front end face 205 of the transition frame connecting ear, and the third adjustment ring 900 is attached to the rear end face 311 of the connecting ear of the oil cylinder hinged to the transition frame.

[0053] When both the traction unit connecting lugs 305-306 and the oil cylinder connecting lug 307 adopt a single-ear structure or a double-ear structure, the second adjusting ring 700 and the third adjusting ring 900 are located on the same side of the connecting lug of the single-ear structure in their respective hinge structures; when one of the traction unit connecting lugs 305-306 and the oil cylinder connecting lug 307 adopts a single-ear structure and the other adopts a double-ear structure, the second adjusting ring 700 and the third adjusting ring 900 are located on the opposite sides of the connecting lug of the single-ear structure in their respective hinge structures. For example, in this embodiment, the traction unit connecting lug and the oil cylinder connecting lug adopt a single-ear structure and a double-ear structure respectively. The second adjusting ring 700 abuts against the front end face 308 of the traction unit connecting lug, and the third adjusting ring 900 abuts against the rear end face 311 of the connecting lug of the oil cylinder hinged to the transition frame.

[0054] Similar to the first pin shaft, a circular flange can be provided at one end of the second pin shaft. In the installed state, the end where the circular flange is located faces the front side or the rear side of the transition frame. In this embodiment, there is only one oil cylinder connecting lug, and a circular flange is provided at one end of the third pin shaft. When installing, an end cover can be fixed at the other end of the third pin shaft to enclose the corresponding end face at the connection between the third pin shaft and the connecting lug, so as to play a protective role.

[0055] Similar to the installation structure of the first pin shaft, the second pin shaft and the third pin shaft can also be installed in a transitional manner with the corresponding connecting seats through wear-resistant sleeves. The wear-resistant sleeves are fixed in the ear holes of the corresponding connecting lugs, so that the second pin shaft, the third pin shaft and the wear-resistant sleeves are in clearance fit. When the connecting lug is a double-ear structure, one end of the wear-resistant sleeve can be provided with a flange with a circular end face shape. In the installed state, the flange is installed by inlaying on the inner end face of the double-ear structure connecting lug in the front-rear direction. When the connecting lug is a single-ear structure, the wear-resistant sleeve can adopt a straight cylindrical structure without flanges at both ends.

[0056] By adjusting the installation positions of the first adjusting ring, the second adjusting ring and the third adjusting ring of the present invention, the rocker arm body 200 can be moved back and forth relative to the mining machine body, and the maximum distance that can be moved is the sum of the thicknesses of the first adjusting ring and the third adjusting ring.

[0057] In this article, the terms "front" and "rear" respectively refer to the directions close to and away from the ore body.

Claims

1. A mining machine rocker arm with adjustable position, Features: It includes a first pin shaft, a first adjusting ring, and a connected rocker arm body and a transition frame, and the ends where the rocker arm body and the transition frame are connected are respectively provided with an upper and lower group of transition frame connecting ears and an upper and lower group of rocker arm body connecting ears, the transition frame connecting ears and the rocker arm body connecting ears are matched one by one and are hinged by passing through the first pin shaft, and the hinge axis extends forward and backward, and a first adjusting ring is axially embedded and installed between the transition frame connecting ear and the rocker arm body connecting ear at each paired hinge, and the first adjusting ring is sleeved on the first pin shaft, and all the first adjusting rings are in the same position relative to the rocker arm body connecting ears in the hinged structure to which they belong, and one of the rocker arm body connecting ear and the transition frame connecting ear adopts a double-ear structure, and the other adopts a single-ear structure.

2. The position-adjustable mining machine rocker arm according to claim 1, Features: A circular flange is provided at one end of the first pin shaft, and the circular flange of the first pin shaft faces the front and rear outer sides of the rocker arm body in the installed state.

3. The position-adjustable mining machine rocker arm as claimed in claim 2, Features: The first adjustment ring is clearance-fitted with the first pin shaft, and a wear-resistant sleeve is respectively installed between the rocker arm body connecting ear and the transition frame connecting ear and the first pin shaft, the wear-resistant sleeve and the ear hole of the corresponding connecting ear are interference-fitted, and the first pin shaft and the wear-resistant sleeve are clearance-fitted.

4. The position-adjustable mining machine rocker arm according to claim 3, Features: One end of the wear-resistant sleeve between the first pin shaft and the connecting ear of the double-ear structure is provided with a flange with a circular end face shape. In the installed state, the circular flange is embedded and installed on the inner end face of the connecting ear of the double-ear structure in the front-rear direction.

5. The position-adjustable mining machine rocker arm according to claim 1, 2, 3 or 4, Features: The upper part of one end of the transition frame away from the rocker arm body is provided with a traction part connecting ear, and the lower part is provided with an oil cylinder connecting ear.

6. The position-adjustable mining machine rocker arm according to claim 1, 2, 3 or 4, Features: A strip-shaped auxiliary loading plate extending along the upper edge is fixedly mounted at the upper edge of the rear end surface of the roller mounting end of the rocker arm body, and the plate surface of the auxiliary loading plate is inclined rearward and downward.

7. The position-adjustable mining machine rocker arm according to claim 5, Features: A strip-shaped auxiliary loading plate extending along the upper edge is fixedly mounted at the upper edge of the rear end surface of the roller mounting end of the rocker arm body, and the plate surface of the auxiliary loading plate is inclined rearward and downward.

8. A mining machine rocker arm mounting structure with adjustable position, Features: Comprising a traction part, an oil cylinder, a second pin shaft, a second adjusting ring, a third pin shaft, a third adjusting ring and the position-adjustable mining machine rocker arm as described in claim 5, 6 or 7, the connecting ear of the traction part is paired with the rocker arm connecting ear on the traction part and is hinged by passing through the second pin shaft, the hinge axis extends back and forth, and a second adjusting ring is axially embedded and installed between the paired and hinged connecting ear of the traction part and the rocker arm connecting ear. The second adjusting ring is sleeved on the second pin shaft. When there are multiple paired and hinged connecting ears of the traction part and the rocker arm connecting ear, all the second adjusting rings are in the same position relative to the connecting ear of the traction part within their respective hinged structures. The connecting ear of the oil cylinder is hinged with the ear seat at one end of the oil cylinder by passing through the third pin shaft, the hinge axis extends back and forth, the third adjusting ring is sleeved on the third pin shaft and is axially embedded and installed between the two connecting ears where the transition frame is paired and connected with the oil cylinder. The thicknesses of the second adjusting ring and the third adjusting ring are equal. One of the two connecting ears in all paired and hinged connections adopts a double-ear structure, and the other adopts a single-ear structure.

9. The position-adjustable mining machine rocker arm mounting structure as described in claim 8, characterized in that: When the connecting ear of the transition frame and the connecting ear of the oil cylinder both adopt a single-ear structure or a double-ear structure, the first adjusting ring and the third adjusting ring are located on the same side of the connecting ear with the single-ear structure in their respective hinged structures. When the connecting ear of the transition frame and the connecting ear of the oil cylinder one adopts a single-ear structure and the other adopts a double-ear structure, the first adjusting ring and the third adjusting ring are located on the opposite sides of the connecting ear with the single-ear structure in their respective hinged structures; when the connecting ear of the traction part and the connecting ear of the oil cylinder both adopt a single-ear structure or a double-ear structure, the second adjusting ring and the third adjusting ring are located on the same side of the connecting ear with the single-ear structure in their respective hinged structures. When the connecting ear of the traction part and the connecting ear of the oil cylinder one adopts a single-ear structure and the other adopts a double-ear structure, the second adjusting ring and the third adjusting ring are located on the opposite sides of the connecting ear with the single-ear structure in their respective hinged structures.

10. The position-adjustable mining machine rocker arm mounting structure as described in claim 9, characterized in that: The second adjusting ring is in clearance fit with the second pin shaft, and the third adjusting ring is in clearance fit with the third pin shaft. Wear-resistant sleeves are respectively installed between the connecting ear of the traction part and the rocker arm connecting ear and the second pin shaft, and between the connecting ear of the oil cylinder and the ear seat at one end of the oil cylinder and the third pin shaft. The wear-resistant sleeve and the ear hole of the corresponding connecting ear are in interference fit, and the second pin shaft, the third pin shaft and the corresponding wear-resistant sleeve are in clearance fit.

11. The position-adjustable mining machine rocker arm mounting structure as described in claim 10, characterized in that: One end of the wear-resistant sleeve between the second pin shaft and the third pin shaft and the connecting ear with the double-ear structure is provided with a flanging with a circular end face shape. In the installed state, the circular flanging is inlaid and installed on the inner end face in the front and back directions of the connecting ear with the double-ear structure.

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