Installation structure for secondary transmission shaft of rocker arm of coal mining machine

Abstract

The utility model discloses a coal mining machine rocker arm secondary transmission shaft installation structure, a secondary transmission shaft comprises a first shaft section and a second shaft section, a supporting sleeve is installed in a butt joint installation hole, and a center hole of the supporting sleeve comprises a first hole section in clearance fit with the first butt joint shaft section and a second hole section in transition fit with the second butt joint shaft section. An O-shaped sealing ring is installed between the second hole section and the second butt joint shaft section, an oil seal is arranged between the outer circle face of the annular wing plate and the inner circle face of the butt joint installation hole, the second shaft section is a gear shaft, and the inner diameter of the oil seal is larger than the addendum circle diameter of the gear shaft. The supporting sleeve is installed in the butt joint installation hole, the oil seal is installed on the outer circle face of the annular wing plate in an interference fit mode, external sealing of the supporting sleeve can be achieved, when the secondary transmission shaft needs to be disassembled underground, all parts located below the partition plate can be smoothly disassembled through the butt joint installation hole, and the secondary transmission shaft can be conveniently disassembled. And the working efficiency of dismounting the secondary transmission shaft underground can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rocker arms of coal mining machines, and in particular relates to a secondary transmission shaft installation structure of a rocker arm of a coal mining machine. Background Art

[0002] With the further development of coal industry technology, the requirements for the overall structure and performance of coal mining machines are getting higher and higher. As the most important component of coal mining machines, the structural design of coal mining machine rocker arms also has more requirements. Among them, the secondary transmission shaft of the coal mining machine rocker arm is a key component of the rocker arm transmission system, which is connected to the high-speed gear cavity and the arm idler cavity of the coal mining machine rocker arm. In order to achieve multi-cavity lubrication, it is necessary to add a sealing component to the secondary transmission shaft. Usually, the oil seal is installed on the shaft gear of the secondary transmission shaft, and a sealing seat and a retaining ring for fixing the oil seal are installed in the rocker arm housing. However, since the oil seal seat is fixed in the rocker arm housing, when the secondary transmission shaft needs to be disassembled underground, the retaining ring and the sealing seat need to be removed first, which takes a lot of time and affects the underground mining progress. In addition, in the process of disassembling the retaining ring and the sealing seat underground, the oil seal may not be installed in place, and the retaining ring and the oil seal may be damaged due to violent disassembly. Therefore, a secondary transmission shaft installation structure of the coal mining machine rocker arm that is easy to disassemble underground should be provided. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a secondary transmission shaft installation structure for the rocker arm of a coal mining machine in view of the deficiencies in the above-mentioned prior art. The structure is simple and the design is reasonable. By installing a support sleeve in the docking installation hole, the oil seal is installed on the outer cylindrical surface of the annular wing plate with an interference fit. Even under different cavity air pressures, during the operation of the coal mining machine, it can be ensured that the oil seal will not fall off, thereby realizing the external sealing of the support sleeve. When the secondary transmission shaft needs to be disassembled underground, all parts located under the partition can be smoothly removed through the docking installation hole, which helps to improve the work efficiency of disassembling the secondary transmission shaft underground.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a secondary transmission shaft installation structure of a coal mining machine rocker arm, characterized in that: the secondary transmission shaft includes a first shaft section and a second shaft section coaxially butt-jointedly installed on the rocker arm housing, the first butt-jointed shaft section of the first shaft section and the second butt-jointed shaft section of the second shaft section are butt-jointedly installed on a partition inside the rocker arm housing, a butt-jointed installation hole is provided on the partition, a butt-jointed installation hole is provided, a support sleeve for supporting the first butt-jointed shaft section and the second butt-jointed shaft section is installed in the butt-jointed installation hole, the center hole of the support sleeve includes a first hole section with a clearance fit with the first butt-jointed shaft section and a second hole section with a transition fit with the second butt-jointed shaft section, an O-ring is installed between the second hole section and the second butt-jointed shaft section, an annular wing plate is provided on the outer circumferential surface of the support sleeve, an oil seal is provided between the outer circumferential surface of the annular wing plate and the inner circumferential surface of the butt-jointed installation hole, the second shaft section is a gear shaft, and the inner diameter of the oil seal is larger than the tooth top circle diameter of the gear shaft.

[0005] The above-mentioned secondary transmission shaft installation structure of the coal mining machine rocker arm is characterized in that: a gear is installed in the middle of the first shaft section, the non-joint shaft section of the first shaft section is rotatably installed on the first side plate of the rocker arm housing through a first bearing, and the non-joint shaft section of the second shaft section is rotatably installed on the second side plate of the rocker arm housing through a second bearing.

[0006] The above-mentioned secondary transmission shaft installation structure of the coal mining machine rocker arm is characterized in that: a first bearing end cover is installed on the first side plate, and a second bearing end cover is installed on the second side plate. The diameter of the installation hole of the first bearing end cover is larger than the top circle diameter of the gear, and the diameter of the docking installation hole is larger than the diameter of the second bearing end cover.

[0007] Compared with the prior art, the utility model has the following advantages:

[0008] 1. The utility model installs a support sleeve in the docking installation hole, the first hole section of the support sleeve is clearance-matched with the first docking shaft section, the second hole section of the support sleeve is transitionally matched with the second docking shaft section, and an O-ring is installed between the second hole section and the second docking shaft section. The O-ring is used to realize internal sealing of the support sleeve, and an oil seal is arranged between the outer circumferential surface of the annular wing plate and the inner circumferential surface of the docking installation hole, and the inner diameter of the oil seal is larger than the tooth top circle diameter of the gear shaft. In actual use, the partition divides the rocker arm housing into a high-speed gear cavity and an arm body idler cavity. Due to the different cavity temperatures of the high-speed gear cavity and the arm body idler cavity, the air pressures in the two cavities are different. Therefore, the oil seal is installed on the outer circumferential surface of the annular wing plate with an interference fit, so that a fixed connection between the oil seal and the support sleeve can be realized. Even under different cavity air pressures, during the operation of the coal mining machine, it can be ensured that the oil seal will not fall off, thereby realizing external sealing of the support sleeve.

[0009] 2. The utility model provides an annular wing plate on the outer circumferential surface of the support sleeve, which helps to increase the diameter of the docking installation hole. When the secondary transmission shaft needs to be disassembled underground, all parts located below the partition can be smoothly removed through the docking installation hole, which helps to improve the work efficiency of disassembling the secondary transmission shaft underground.

[0010] 3. The utility model has a simple structure and a reasonable design, is easy to disassemble and inspect underground, and is easy to promote and apply.

[0011] To sum up, the utility model has a simple structure and a reasonable design. By installing a support sleeve in the docking mounting hole, the oil seal is installed on the outer cylindrical surface of the annular wing plate with an interference fit. Even under different cavity air pressures, during the operation of the coal mining machine, it can be ensured that the oil seal will not fall off, thereby realizing the external sealing of the support sleeve. When the secondary transmission shaft needs to be disassembled underground, all parts located under the partition can be smoothly removed through the docking mounting hole, which helps to improve the work efficiency of disassembling the secondary transmission shaft underground.

[0012] The present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a structural schematic diagram of the support sleeve of the utility model.

[0015] Description of reference numerals:

[0016] 1—first shaft section; 1-1—first connecting shaft section; 2—second shaft section;

[0017] 2-1—second docking shaft section; 3—gear; 4—support sleeve;

[0018] 4-1—first hole section; 4-2—second hole section; 4-3—O-ring installation groove;

[0019] 4-4—annular wing plate; 5—O-ring; 6—oil seal;

[0020] 7—partition plate; 8-1—first side plate; 8-2—second side plate;

[0021] 9-1—first bearing end cover; 9-2—second bearing end cover. DETAILED DESCRIPTION

[0022] like Figure 1 and Figure 2The secondary transmission shaft installation structure of a rocker arm of a coal mining machine is shown, wherein the secondary transmission shaft comprises a first shaft section 1 and a second shaft section 2 coaxially butt-jointedly mounted on a rocker arm housing, a first butt-jointed shaft section 1-1 of the first shaft section 1 and a second butt-jointed shaft section 2-1 of the second shaft section 2 are butt-jointedly mounted on a partition 7 in the rocker arm housing, a butt-jointed mounting hole 7-1 is provided on the partition 7, a support sleeve 4 for supporting the first butt-jointed shaft section 1-1 and the second butt-jointed shaft section 2-1 is installed in the butt-jointed mounting hole 7-1, and a center of the support sleeve 4 is provided. The core hole includes a first hole section 4-1 that is clearance-matched with the first docking shaft section 1-1 and a second hole section 4-2 that is transitionally matched with the second docking shaft section 2-1. An O-ring 5 is installed between the second hole section 4-2 and the second docking shaft section 2-1. An annular wing plate 4-4 is arranged on the outer circumferential surface of the support sleeve 4. An oil seal 6 is arranged between the outer circumferential surface of the annular wing plate 4-4 and the inner circumferential surface of the docking mounting hole 7-1. The second shaft section 2 is a gear shaft, and the inner diameter of the oil seal 6 is larger than the tooth top circle diameter of the gear shaft.

[0023] In this embodiment, by installing the support sleeve 4 in the docking installation hole 7-1, the first hole section 4-1 of the support sleeve 4 is clearance-matched with the first docking shaft section 1-1, the second hole section 4-2 of the support sleeve 4 is transitionally matched with the second docking shaft section 2-1, and an O-type sealing ring 5 is installed between the second hole section 4-2 and the second docking shaft section 2-1, and the internal sealing of the support sleeve 4 is achieved by using the O-type sealing ring 5, and an oil seal 6 is provided between the outer circumferential surface of the annular wing plate 4-4 and the inner circumferential surface of the docking installation hole 7-1, and the inner diameter of the oil seal 6 is larger than the inner diameter of the annular wing plate 4-4. The tooth top circle diameter of the gear shaft, in actual use, the partition 7 divides the rocker arm housing into a high-speed gear cavity and an arm body idler cavity. Due to the different cavity temperatures of the high-speed gear cavity and the arm body idler cavity, the air pressures in the two cavities are different. Therefore, the oil seal 6 is installed on the outer circumferential surface of the annular wing plate 4-4 with an interference fit, so that the oil seal 6 and the support sleeve 4 can be fixedly connected. Even under different cavity air pressures, during the operation of the coal mining machine, it can be ensured that the oil seal 6 will not fall off, thereby realizing the external sealing of the support sleeve 4.

[0024] In this embodiment, by providing an annular wing plate 4-4 on the outer circumferential surface of the support sleeve 4, it helps to increase the diameter of the docking mounting hole 7-1. When the secondary transmission shaft needs to be disassembled underground, all parts located under the partition 7 can be smoothly removed through the docking mounting hole 7-1, which helps to improve the work efficiency of disassembling the secondary transmission shaft underground.

[0025] In this embodiment, a gear 3 is installed in the middle of the first shaft section 1, and the non-joint shaft section of the first shaft section 1 is rotatably mounted on the first side plate 8-1 of the rocker arm housing through a first bearing, and the non-joint shaft section of the second shaft section 2 is rotatably mounted on the second side plate 8-2 of the rocker arm housing through a second bearing.

[0026] In this embodiment, a first bearing end cover 9-1 is installed on the first side plate 8-1, and a second bearing end cover 9-2 is installed on the second side plate 8-2. The diameter of the mounting hole of the first bearing end cover 9-1 is larger than the diameter of the tooth top circle of the gear 3, and the diameter of the docking mounting hole 7-1 is larger than the diameter of the second bearing end cover 9-2.

[0027] In actual use, when the secondary transmission shaft needs to be disassembled underground, the second bearing and the second bearing end cover 9-2 located below the gear shaft can be successfully removed through the docking mounting hole 7-1.

[0028] like Figure 1 As shown, when disassembling the secondary transmission shaft installation structure underground, first remove the first bearing end cover 9-1; secondly, remove the first shaft section 1 and the gear 3; then, remove the support sleeve 4, and the oil seal 6 and the O-ring 5 will be removed at the same time as the support sleeve 4, without causing damage to the oil seal 6 and the O-ring 5; then, remove the gear shaft, the second bearing and the second bearing end cover 9-2, so that all parts of the secondary transmission shaft installation structure are completely removed, which is convenient for checking the use of each part during the operation of the coal mining machine; and when installing the secondary transmission shaft installation structure underground, the operation is simple, no bolt tightening operation is required, and no bumps will be caused inside the rocker arm housing.

[0029] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A secondary transmission shaft installation structure for a coal mining machine rocker arm, characterized in that: The secondary transmission shaft comprises a first shaft section (1) and a second shaft section (2) coaxially butt-jointedly mounted on a rocker housing; a first butt-jointed shaft section (1-1) of the first shaft section (1) and a second butt-jointed shaft section (2-1) of the second shaft section (2) are butt-jointedly mounted on a partition (7) in the rocker housing; a butt-jointed mounting hole (7-1) is provided on the partition (7); a support sleeve (4) for supporting the first butt-jointed shaft section (1-1) and the second butt-jointed shaft section (2-1) is installed in the butt-jointed mounting hole (7-1); a center hole of the support sleeve (4) comprises a first butt-jointed shaft section (1-1) and a second butt-jointed shaft section (2-1) which are coaxially butt-jointedly mounted on the rocker housing; A first hole section (4-1) with clearance fit of the connecting shaft section (1-1) and a second hole section (4-2) with transition fit to the second docking shaft section (2-1); an O-ring (5) is installed between the second hole section (4-2) and the second docking shaft section (2-1); an annular wing plate (4-4) is arranged on the outer circumferential surface of the support sleeve (4); an oil seal (6) is arranged between the outer circumferential surface of the annular wing plate (4-4) and the inner circumferential surface of the docking installation hole (7-1); the second shaft section (2) is a gear shaft; the inner diameter of the oil seal (6) is greater than the tooth top circle diameter of the gear shaft.

2. A coal mining machine rocker arm secondary transmission shaft installation structure according to claim 1, characterized in that: A gear (3) is installed in the middle of the first shaft section (1); the non-joint shaft section of the first shaft section (1) is rotatably mounted on the first side plate (8-1) of the rocker arm housing via a first bearing; and the non-joint shaft section of the second shaft section (2) is rotatably mounted on the second side plate (8-2) of the rocker arm housing via a second bearing.

3. A coal mining machine rocker arm secondary transmission shaft installation structure according to claim 2, characterized in that: A first bearing end cover (9-1) is mounted on the first side plate (8-1), and a second bearing end cover (9-2) is mounted on the second side plate (8-2); the diameter of the mounting hole of the first bearing end cover (9-1) is larger than the diameter of the tooth top circle of the gear (3), and the diameter of the docking mounting hole (7-1) is larger than the diameter of the second bearing end cover (9-2).

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