Rocker arm sealing device of coal mining machine

Abstract

The utility model provides a coal mining machine rocker arm sealing device which comprises a cover plate, a central water pipe and a sealing structure, and the central water pipe is in sealing fit with the cover plate through the sealing structure; the sealing structure comprises a water pipe sealing sleeve and a plurality of annular sealing pieces, the water pipe sealing sleeve is arranged in the cover plate, one end of the central water pipe penetrates through the cover plate and penetrates through the sealing structure, and the annular sealing pieces comprise water jacket sealing rings with Y-shaped sections and annular flaring pieces arranged in the water jacket sealing rings. The water pipe sealing sleeve is provided with an installation area used for installing the water jacket sealing ring, the water jacket sealing ring is arranged in the installation area and provided with a first annular sealing section and a second annular sealing section, and the first annular sealing section and the second annular sealing section are relatively inclined and expand outwards. The first annular sealing section and the second annular sealing section are respectively pressed against the inner wall of the mounting area and the outer wall of the central water pipe through elastic force; and the water jacket sealing ring is made of a polyurethane material. By adopting the scheme, the sealing performance of the rocker arm sealing device of the coal mining machine on the central water pipe can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rocker arms of coal mining machines, in particular to a rocker arm sealing device for coal mining machines. Background Art

[0002] The rocker arm of the coal mining machine will generate a lot of dust during the coal cutting process, which will limit the vision of the working face and make it difficult for workers to breathe. Therefore, a central waterway is designed at the planetary head of the rocker arm of the coal mining machine. The water from the coal mine working face enters the water inlet seat in the central waterway through a hose, enters the drum waterway through the central water pipe and the pipe seat, and is sprayed out from the nozzle to form an internal spray, which mainly plays a role in dust reduction.

[0003] During the operation of the coal mining machine, the central water pipe of the rocker arm will leak. Once the leaked water enters the lubricating oil circuit, it will cause the lubricating oil to emulsify, the gear temperature rise will accelerate, the gear failure will be accelerated, the transmission system will be locked, and the coal mining machine will not work normally, affecting the coal mining machine start-up rate; at the same time, after the leak, the pressure of the internal spray system will decrease, affecting the normal use of the internal spray system, and causing the coal dust concentration in the working environment to increase. The seal of the central water pipe of the rocker arm is an important component to prevent the spray water from entering the oil chamber. A good sealing system can effectively avoid the failure of the emulsion, so the selection and design of its materials and structure are crucial.

[0004] At present, the central water pipe seal of the rocker arm of the coal mining machine mainly adopts a split combined structure, which is mainly composed of rubber cloth, polyformaldehyde, springs and other components. However, the existing central water pipe sealing structure has poor sealing performance, unreasonable structure, poor wear resistance, and low smoothness of the sealing lip contact surface. According to the working principle of the central water pipe seal of the rocker arm, when the coal mining machine is mining normally, the central water pipe of the central waterway of the rocker arm is in a rotating state, the water seal does not move, and the outer diameter of the central water pipe and the inner diameter of the water seal will rub against each other, which often affects the sealing performance and leaks during use. Utility Model Content

[0005] The utility model provides a rocker arm sealing device for a coal mining machine, so as to improve the sealing performance of the rocker arm sealing device for the coal mining machine to a central water pipe.

[0006] In order to solve the above problems, the utility model provides a coal mining machine rocker arm sealing device, including a cover plate, a central water pipe and a sealing structure, the central water pipe is sealed with the cover plate through the sealing structure; the sealing structure includes a water pipe sealing sleeve and multiple annular sealing components, the water pipe sealing sleeve is arranged in the cover plate, one end of the central water pipe is penetrated in the cover plate and passes through the sealing structure, the multiple annular sealing components include a water jacket sealing ring with a Y-shaped cross-section shape and an annular expansion component arranged in the water jacket sealing ring, the water pipe sealing sleeve has an installation area for installing the water jacket sealing ring, the water jacket sealing ring is arranged in the installation area and has a first annular sealing section and a second annular sealing section that are relatively inclined and expanded outward, the annular expansion component is an elastic component, so that the first annular sealing section and the second annular sealing section are pressed against the inner wall of the installation area and the outer wall of the central water pipe respectively through elastic force; wherein the water jacket sealing ring is made of polyurethane.

[0007] Furthermore, the cross-sectional shape of the annular expansion member is V-shaped or expanded U-shaped, and the annular expansion member includes an outer ring and an inner ring connected to each other, and the ends of the outer ring and the inner ring that are separated from each other are separated around the ends of the outer ring and the inner ring that are connected to each other to press against the first annular sealing section and the second annular sealing section respectively.

[0008] Further, the annular expansion piece is clamped and / or welded in the area between the first annular sealing section and the second annular sealing section.

[0009] Furthermore, an annular retaining ring is provided at the end of the mutually adjacent side surface of the first annular sealing segment and the second annular sealing segment, and the annular expansion piece installed in the area between the first annular sealing segment and the second annular sealing segment abuts against the two annular retaining rings.

[0010] Further, the annular expansion piece is welded in the area between the first annular sealing section and the second annular sealing section by laser welding.

[0011] Furthermore, the axial length of the water jacket sealing ring is H, 0<H≤40mm; the maximum outer diameter of the water jacket sealing ring is D, D≥50mm; the difference between the maximum outer diameter and the minimum inner diameter of the water jacket sealing ring is 2*CS, 5mm≤CS≤15mm.

[0012] Furthermore, the water pipe sealing sleeve has a penetration hole for passing the central water pipe, and the penetration hole includes a limiting hole section, a mounting hole section and a matching hole section which are connected in sequence and whose radial dimensions are sequentially reduced. The central water pipe is limitedly matched with the inner wall of the matching hole section. The sealing structure also includes a sealing pressure plate, which is sleeved on the outer periphery of the central water pipe and arranged in the limiting hole section. The area surrounded by the inner wall of the mounting hole section, the sealing pressure plate and the central water pipe forms an installation area.

[0013] Furthermore, the cover plate has a mounting hole for installing the water pipe sealing sleeve, and the mounting hole has a first limit step, a first inner retaining ring, a second inner retaining ring and a second limit step sequentially spaced along its axial direction. The first limit step and the first inner retaining ring respectively abut against the two ends of the water pipe sealing sleeve in the axial direction to limit the position of the water pipe sealing sleeve in the cover plate. The coal mining machine rocker arm sealing device also includes a bearing, which is arranged between the inner wall of the mounting hole and the outer wall of the central water pipe, and the second inner retaining ring and the second limit step respectively abut against the two ends of the bearing in the axial direction.

[0014] Furthermore, the multiple annular seals also include an annular sealing ring, a rotating seal and at least two O-rings. The water jacket sealing ring, the annular sealing ring and the rotating seal are sequentially spaced along the axial direction of the water pipe sealing sleeve in the water pipe sealing sleeve to seal the area between the water pipe sealing sleeve and the central water pipe. At least two O-rings are sequentially spaced along the axial direction of the water pipe sealing sleeve on the outer periphery of the water pipe sealing sleeve to seal the area between the water pipe sealing sleeve and the cover plate.

[0015] Furthermore, the coal mining machine rocker arm sealing device also includes a main body, a cover plate is arranged on the main body and seals with the main body, and a central water pipe is arranged through the main body.

[0016] Applying the technical scheme of the utility model, a coal mining machine rocker arm sealing device is provided, including a cover plate, a central water pipe and a sealing structure, wherein the central water pipe is sealed with the cover plate through the sealing structure; the sealing structure includes a water pipe sealing sleeve and a plurality of annular sealing components, the water pipe sealing sleeve is arranged in the cover plate, one end of the central water pipe is penetrated in the cover plate and passes through the sealing structure, the plurality of annular sealing components include a water jacket sealing ring with a Y-shaped cross-section and an annular expansion component arranged in the water jacket sealing ring, the water pipe sealing sleeve has an installation area for installing the water jacket sealing ring, the water jacket sealing ring is arranged in the installation area and has a first annular sealing section and a second annular sealing section that are relatively inclined and expanded outward, the annular expansion component is an elastic component, so as to press the first annular sealing section and the second annular sealing section against the inner wall of the installation area and the outer wall of the central water pipe respectively through elastic force; wherein the water jacket sealing ring is made of polyurethane.

[0017] By adopting this scheme, the water jacket sealing ring is replaced with polyurethane material. Due to its high pressure resistance, non-deformation, strong wear resistance and other characteristics, compared with conventional annular seals, this type of sealing product has better sealing performance, better pressure resistance and wear resistance, and improved sealing reliability. On the other hand, this scheme can realize the expansion of the first annular sealing section and the second annular sealing section through an elastic annular expansion member. Compared with the sealing member composed of rubber sandwich cloth, polyformaldehyde, spring and other components in the prior art, the expansion structure and expansion method of the sealing member provided by this scheme are simpler and more stable, and even in the case of slight wear on the sealing surface, the elastic member can timely elastically compensate the first annular sealing section and the second annular sealing section to ensure that the first annular sealing section and the second annular sealing section can always abut against the inner wall of the installation area and the outer wall of the central water pipe, which is conducive to further improving and ensuring the sealing effect, and then ensuring the normal operation of the coal mining machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic structural diagram of a rocker arm sealing device for a coal mining machine provided by an embodiment of the utility model is shown;

[0020] Figure 2 Shows Figure 1 A magnified view of position A in the middle;

[0021] Figure 3 Shows Figure 1 A cross-sectional view of the water jacket seal of a coal mining machine rocker arm seal.

[0022] The above drawings include the following reference numerals:

[0023] 10. Cover plate; 101. First limiting step; 102. Second limiting step; 103. First inner retaining ring; 104. Second inner retaining ring;

[0024] 20. Central water pipe;

[0025] 31. Water pipe sealing sleeve; 311. Installation area; 32. Water jacket sealing ring; 321. First annular sealing section; 322. Second annular sealing section; 323. Annular retaining ring; 33. Annular flaring member; 331. Outer ring; 332. Inner ring; 34. Sealing plate; 35. Annular sealing ring; 36. Rotating sealing member; 37. O-ring;

[0026] 40. Subject;

[0027] 50. Bearings;

[0028] 60. End cap;

[0029] 71. First sealing ring; 72. Second sealing ring; 73. First bushing; 74. Second bushing. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0031] like Figures 1 to 3 As shown, an embodiment of the utility model provides a rocker arm sealing device for a coal mining machine, comprising a cover plate 10, a central water pipe 20 and a sealing structure, wherein the central water pipe 20 is sealed with the cover plate 10 through the sealing structure; the sealing structure comprises a water pipe sealing sleeve 31 and a plurality of annular sealing members, wherein the water pipe sealing sleeve 31 is arranged in the cover plate 10, one end of the central water pipe 20 is penetrated in the cover plate 10 and passes through the sealing structure, and the plurality of annular sealing members comprise a water jacket sealing ring 32 having a Y-shaped cross-section and a sealing ring 32 arranged in the water jacket sealing ring 32. The annular expansion piece 33, the water pipe sealing sleeve 31 has an installation area 311 for installing the water jacket sealing ring 32, the water jacket sealing ring 32 is arranged in the installation area 311 and has a first annular sealing section 321 and a second annular sealing section 322 that are relatively inclined and expanded outward, and the annular expansion piece 33 is an elastic piece, so that the first annular sealing section 321 and the second annular sealing section 322 are pressed against the inner wall of the installation area 311 and the outer wall of the central water pipe 20 respectively through elastic force; wherein, the water jacket sealing ring 32 is made of polyurethane.

[0032] In this embodiment, the water jacket seal ring 32 is replaced with a polyurethane material. Due to its high pressure resistance, non-deformation, strong wear resistance and other characteristics, compared with conventional annular seals, this type of sealing product has better sealing performance, better pressure resistance and wear resistance, and improved sealing reliability. On the other hand, this embodiment can realize the expansion of the first annular sealing section 321 and the second annular sealing section 322 through the elastic annular expansion member 33. Compared with the sealing member composed of rubber sandwich cloth, polyoxymethylene, spring and other components in the prior art, the expansion structure and expansion method of the sealing member provided in this embodiment are simpler and more stable, and even if the sealing surface is slightly worn, the elastic member can timely elastically compensate the first annular sealing section 321 and the second annular sealing section 322 to ensure that the first annular sealing section 321 and the second annular sealing section 322 can always abut against the inner wall of the installation area 311 and the outer wall of the central water pipe 20, which is conducive to further improving and ensuring the sealing effect, and then ensuring the normal operation of the coal mining machine.

[0033] Specifically, the water pipe sealing sleeve 31 in this embodiment is formed by turning a polyurethane tube material, and the specific parameters of the polyurethane are as follows:

[0034]

[0035] like Figure 2 As shown, the cross-sectional shape of the annular expansion member 33 is V-shaped or expanded U-shaped, and the annular expansion member 33 includes an outer ring 331 and an inner ring 332 connected to each other. The ends of the outer ring 331 and the inner ring 332 that are separated from each other are separated around the ends of the outer ring 331 and the inner ring 332 that are connected to each other to press against the first annular sealing segment 321 and the second annular sealing segment 322 respectively.

[0036] With this arrangement, the cross-sectional shape of the annular expansion member 33 is adapted to the spatial shape between the first annular sealing segment 321 and the second annular sealing segment 322 , which facilitates the processing of the annular expansion member 33 and the elastic expansion of the first annular sealing segment 321 and the second annular sealing segment 322 by the annular expansion member 33 .

[0037] Preferably, the annular expansion member 33 is a V-spring with a V-shaped cross section.

[0038] Specifically, the annular expansion piece 33 is clamped and / or welded in the area between the first annular sealing segment 321 and the second annular sealing segment 322 .

[0039] Such an arrangement facilitates the installation of the annular expansion member 33 and ensures the reliability and stability of the annular expansion member 33 in expanding the first annular sealing segment 321 and the second annular sealing segment 322 .

[0040] In this embodiment, an annular retaining ring 323 is provided at the end of the side surface of the first annular sealing segment 321 and the second annular sealing segment 322 that are close to each other, and the annular expansion piece 33 installed in the area between the first annular sealing segment 321 and the second annular sealing segment 322 abuts against the two annular retaining rings 323.

[0041] In this way, the annular retaining ring 323 can prevent the annular expansion member 33 from escaping from the area between the first annular sealing section 321 and the second annular sealing section 322, thereby ensuring the reliability of the installation of the annular expansion member 33.

[0042] Furthermore, the annular expansion piece 33 is laser welded in the area between the first annular sealing section 321 and the second annular sealing section 322. In this way, the annular expansion piece 33 and the water jacket sealing ring 32 are welded into one body to form an integrated sealing structure with more stable performance, which is easy to carry and install, and can be easily installed in the well or on the ground.

[0043] In this embodiment, the axial length of the water jacket sealing ring 32 is H, 0<H≤40mm; the maximum outer diameter of the water jacket sealing ring 32 is D, D≥50mm; the difference between the maximum outer diameter and the minimum inner diameter of the water jacket sealing ring 32 is 2*CS, 5mm≤CS≤15mm.

[0044]

[0045] Specifically, the outer diameter * inner diameter * width of the product groove size (i.e. the size of the water jacket sealing ring 32) in this embodiment is 70mm*50mm*24mm (i.e. D=70mm, CS=10mm, H=24mm), and the ends of the first annular sealing segment 321 and the second annular sealing segment 322 form a sealing lip, and the designed interference fit of the sealing lip is 20% (i.e. the interference fit of the first annular sealing segment 321 and the second annular sealing segment 322 with the inner wall of the installation area 311 and the outer wall of the central water pipe 20, respectively).

[0046] It is understandable that the size of the water jacket sealing ring 32 can be adjusted within the range of H, D and CS according to actual conditions, and examples are not given here one by one.

[0047] like Figure 1 As shown, the water pipe sealing sleeve 31 has a through hole for passing the central water pipe 20, and the through hole includes a limiting hole section, a mounting hole section and a matching hole section which are connected in sequence and whose radial dimensions are sequentially reduced, and the central water pipe 20 is limitedly matched with the inner wall of the matching hole section, and the sealing structure also includes a sealing pressing plate 34, which is sleeved on the outer periphery of the central water pipe 20 and arranged in the limiting hole section, and the area surrounded by the inner wall of the mounting hole section, the sealing pressing plate 34 and the central water pipe 20 forms an installation area 311. This arrangement facilitates the formation of the installation area and the installation and positioning of the water jacket sealing ring 32.

[0048] like Figure 1 As shown, the cover plate 10 has a mounting hole for mounting the water pipe sealing sleeve 31, and the mounting hole has a first limiting step 101, a first inner retaining ring 103, a second inner retaining ring 104 and a second limiting step 102 sequentially spaced along the axial direction thereof, the first limiting step 101 and the first inner retaining ring 103 respectively abut against the two ends of the water pipe sealing sleeve 31 in the axial direction to limit the position of the water pipe sealing sleeve 31 in the cover plate 10, and the rocker arm sealing device of the coal mining machine also includes a bearing 50, which is arranged between the inner wall of the mounting hole and the outer wall of the central water pipe 20, and the second inner retaining ring 104 and the second limiting step 102 respectively abut against the two ends of the bearing 50 in the axial direction. Such an arrangement facilitates the installation and limiting of the water pipe sealing sleeve 31 and the bearing 50.

[0049] Specifically, the multiple annular seals also include an annular sealing ring 35, a rotating seal 36 and at least two O-rings 37. The water jacket sealing ring 32, the annular sealing ring 35 and the rotating seal 36 are sequentially spaced along the axial direction of the water pipe sealing sleeve 31 in the water pipe sealing sleeve 31 to seal the area between the water pipe sealing sleeve 31 and the central water pipe 20. At least two O-rings 37 are sequentially spaced along the axial direction of the water pipe sealing sleeve 31 on the outer periphery of the water pipe sealing sleeve 31 to seal the area between the water pipe sealing sleeve 31 and the cover plate 10.

[0050] In this way, the sealing effect and reliability of the sealing between the central water pipe 20 and the cover plate 10 are further ensured through multiple seals.

[0051] like Figure 1 As shown, the rocker arm sealing device of the coal mining machine also includes a main body 40 , a cover plate 10 is arranged on the main body 40 and is sealed with the main body 40 , and a central water pipe 20 is arranged through the main body 40 .

[0052] Optionally, the rocker arm sealing device of the coal mining machine further includes an end cover 60, a first sealing ring 71, a second sealing ring 72, a first bushing 73 and a second bushing 74, the main body 40 and the cover plate 10 are sealed by the first sealing ring 71, the end cover 60 is arranged on the top of the cover plate 10 and is sealed with the cover plate 10 by the second sealing ring 72, the first bushing 73 is arranged on the sealing pressure plate 34 to limit the movement of the sealing pressure plate 34 along the axial direction of the cover plate 10, and the second bushing 74 is arranged on the outer periphery of the top side wall of the water pipe sealing sleeve 31. Preferably, the bearing 50 is a deep groove single row ball bearing.

[0053] In summary, the utility model provides a rocker arm sealing device for a coal mining machine. The lip installation direction of the central water pipe sealing structure (water jacket sealing ring 32) of the rocker arm is the direction of water pressure. Under normal circumstances, the sealing surface of the sealing lip and the built-in V spring are tightly combined with the central water pipe 20 to prevent water from flowing into the gear box. When the seal is used for a long time and wears and deforms, the built-in V spring generates a preload, the spring opens, and the sealing surface of the sealing lip is pushed out, thereby pressing the sealed metal surface to form an excellent sealing effect. The water jacket sealing ring 32 is made of polyurethane material, which has better wear resistance and pressure resistance, and improves the reliability of the seal. And due to the excellent characteristics of the V spring, even when the sealing surface is slightly worn, the V spring can be effectively compensated in time to ensure the continuity and stability of the seal. The utility model combines the excellent performance of polyurethane material and V spring, so that the sealing effect is better, the water jacket sealing ring 32 is more wear-resistant, and the normal operation of the coal mining machine is effectively guaranteed.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0056] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rocker arm sealing device for a coal mining machine, characterized in that: The invention comprises a cover plate (10), a central water pipe (20) and a sealing structure, wherein the central water pipe (20) is sealed with the cover plate (10) through the sealing structure; the sealing structure comprises a water pipe sealing sleeve (31) and a plurality of annular sealing members, the water pipe sealing sleeve (31) is arranged in the cover plate (10), one end of the central water pipe (20) is inserted in the cover plate (10) and passes through the sealing structure, the plurality of annular sealing members comprise a water jacket sealing ring (32) having a Y-shaped cross-section and an annular expansion member (33) arranged in the water jacket sealing ring (32), the water pipe sealing sleeve (31) is provided in the cover plate (10), one end of the central water pipe (20) is inserted in the cover plate (10) and passes through the sealing structure, the plurality of annular sealing members comprise a water jacket sealing ring (32) having a Y-shaped cross-section and an annular expansion member (33) arranged in the water jacket sealing ring (32), the water pipe sealing ring (31) is provided in the cover plate (10), and the water pipe sealing ring (31) is provided in the cover plate (10). The sleeve (31) has an installation area (311) for installing the water jacket sealing ring (32); the water jacket sealing ring (32) is arranged in the installation area (311) and has a first annular sealing section (321) and a second annular sealing section (322) that are relatively inclined and expanded outward; the annular expansion member (33) is an elastic member, so that the first annular sealing section (321) and the second annular sealing section (322) are pressed against the inner wall of the installation area (311) and the outer wall of the central water pipe (20) respectively through elastic force; wherein the water jacket sealing ring (32) is made of polyurethane material.

2. The rocker arm sealing device of a coal mining machine according to claim 1, characterized in that: The cross-sectional shape of the annular expansion member (33) is V-shaped or expanded U-shaped. The annular expansion member (33) comprises an outer ring (331) and an inner ring (332) connected to each other. The ends of the outer ring (331) and the inner ring (332) that are separated from each other are separated around the ends of the outer ring (331) and the inner ring (332) that are connected to each other, so as to press against the first annular sealing segment (321) and the second annular sealing segment (322) respectively.

3. The rocker arm sealing device of a coal mining machine according to claim 1, characterized in that: The annular expansion piece (33) is clamped and / or welded in the area between the first annular sealing section (321) and the second annular sealing section (322).

4. The rocker arm sealing device of a coal mining machine according to claim 3, characterized in that: An annular retaining ring (323) is provided at the end of the surface of one side of the first annular sealing section (321) and the second annular sealing section (322) which are close to each other, and the annular expansion member (33) installed in the area between the first annular sealing section (321) and the second annular sealing section (322) abuts against the two annular retaining rings (323).

5. The rocker arm sealing device of a coal mining machine according to claim 4, characterized in that: The annular expansion piece (33) is welded in the area between the first annular sealing section (321) and the second annular sealing section (322) by laser welding.

6. The rocker arm sealing device of a coal mining machine according to claim 1, characterized in that: The axial length of the water jacket sealing ring (32) is H, 0<H≤40mm; The maximum outer diameter of the water jacket sealing ring (32) is D, D≥50mm; The difference between the maximum outer diameter and the minimum inner diameter of the water jacket sealing ring (32) is 2*CS, 5mm≤CS≤ 15mm.

7. The rocker arm sealing device of a coal mining machine according to claim 1, characterized in that: The water pipe sealing sleeve (31) has a through hole for passing the central water pipe (20), the through hole comprising a limiting hole section, a mounting hole section and a matching hole section which are connected in sequence and whose radial dimensions are sequentially reduced, the central water pipe (20) is limitedly matched with the inner wall of the matching hole section, the sealing structure also comprises a sealing pressure plate (34), the sealing pressure plate (34) is sleeved on the outer periphery of the central water pipe (20) and arranged in the limiting hole section, and the area surrounded by the inner wall of the mounting hole section, the sealing pressure plate (34) and the central water pipe (20) forms the mounting area (311).

8. The rocker arm sealing device of a coal mining machine according to claim 1, characterized in that: The cover plate (10) has a mounting hole for mounting the water pipe sealing sleeve (31), and the mounting hole has a first limiting step (101), a first inner retaining ring (103), a second inner retaining ring (104) and a second limiting step (102) which are sequentially spaced along the axial direction thereof. The first limiting step (101) and the first inner retaining ring (103) respectively abut against the two axial ends of the water pipe sealing sleeve (31) to limit the position of the water pipe sealing sleeve (31) in the cover plate (10). The coal mining machine rocker arm sealing device also includes a bearing (50), and the bearing (50) is arranged between the inner wall of the mounting hole and the outer wall of the central water pipe (20), and the second inner retaining ring (104) and the second limiting step (102) respectively abut against the two axial ends of the bearing (50).

9. The rocker arm sealing device of a coal mining machine according to claim 1, characterized in that: The plurality of annular seals further include an annular seal ring (35), a rotary seal (36) and at least two O-rings (37); the water jacket seal ring (32), the annular seal ring (35) and the rotary seal (36) are sequentially spaced apart in the water pipe sealing sleeve (31) along the axial direction of the water pipe sealing sleeve (31) to seal the area between the water pipe sealing sleeve (31) and the central water pipe (20); and at least two O-rings (37) are sequentially spaced apart in the axial direction of the water pipe sealing sleeve (31) on the outer periphery of the water pipe sealing sleeve (31) to seal the area between the water pipe sealing sleeve (31) and the cover plate (10).

10. The rocker arm sealing device of a coal mining machine according to claim 1, characterized in that: The coal mining machine rocker arm sealing device also includes a main body (40), the cover plate (10) is arranged on the main body (40) and is sealed with the main body (40), and the central water pipe (20) is arranged to penetrate the main body (40).

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