A rotary sealing assembly for a shearer boom and a central waterway system

Abstract

The present invention discloses a rotary sealing assembly and a central waterway system for a shearer. The rotary sealing assembly includes a sealing seat and a rotary sleeve. A lip-type rotary seal is provided between the sealing seat and the rotary sleeve. A first leakage hole is formed in the sealing seat. A spring support seat is sleeved outside the rotary sleeve. One end of the spring support seat is provided with a plurality of corrugated springs. A dynamic seal mounting ring is sleeved outside the spring support seat. A dynamic seal ring is installed in the dynamic seal mounting ring. A static seal ring is arranged on one side of the dynamic seal ring. An end face seal pair is formed between the dynamic seal ring and the static seal ring. The central waterway system includes a rotary sealing assembly, a water inlet seat, a water outlet seat, and a central water pipe connected between the rotary sealing assembly and the water outlet seat. The present invention adopts the combination form of end face seal and radial seal, and the combination form of the central water pipe and the rotary sleeve, solves the problem of premature failure of the central water pipe and the sealing assembly in the central waterway of the prior art, and improves the spray dust reduction effect of the coal mining face.

Description

Technical Field

[0001] The invention belongs to the technical field of internal spray of shearers, and particularly relates to a swing arm rotary seal assembly and a central waterway system of a shearer. Background Art

[0002] The control of underground coal dust in coal mines is one of the key tasks for realizing safe production in coal mines. Excessive dust not only affects the underground working environment but also may lead to safety accidents such as explosions. Most of the underground coal dust is generated when the shearer drum cuts the coal wall. Therefore, Article 636 of the "Coal Mine Safety Regulations" stipulates that: "Shearers must be equipped with internal and external spray devices, and must spray to reduce dust during coal cutting. When there is no water or the spray device cannot be used normally, the machine must be stopped."

[0003] The internal spray device of a shearer is an important component for realizing dust reduction, extinguishing sparks, and cooling pick teeth on the working face. The cooling water for internal spray is introduced from one side of the fixed swing arm center gear end cover, passes through the swing arm central waterway system, and is led out from one side of the rotating cutting square head, then connected to the cutting drum, and finally sprayed out by multiple groups of nozzles arranged on the drum. Since the cutting drum rotates during operation, that is, one end of the central water pipe needs to have a rotary seal structure. The failure of the rotary seal will affect the spray water supply pressure, thus affecting the dust reduction effect of the shearer spray, resulting in the deterioration of the working environment of the coal mining face. Moreover, the central water pipe needs to pass through the lubricating oil working area of the planetary mechanism of the shearer swing arm. When the rotary seal of the central waterway fails, the spray water will be mixed with the lubricating oil, resulting in the emulsification of the lubricating oil, affecting the normal operation of the planetary mechanism, and even causing failures such as the locking of the planetary mechanism, seriously affecting the normal use of the shearer, thus reducing the coal mining efficiency and increasing the equipment use cost.

[0004] The traditional central waterway structure consists of main components such as an inlet seat, a rotary seal, a central water pipe, and an outlet seat. The inlet seat and the rotary seal assembly are installed on the central gear cover plate, the outlet seat is installed on the cutting square head, the central water pipe is an integral slender hollow pipe, one end is inserted into the middle of the outlet seat, sealed by an O-ring, and driven by the outlet seat to rotate. The other end is inserted into the inside of the rotary seal assembly, and its outer surface forms a rotary seal pair with the radial water seal fixedly installed inside the rotary seal assembly. According to the rust prevention requirements of the central water pipe, its material is mostly selected as stainless steel. To increase wear resistance, the outer surface of the central water pipe in contact with the radial water seal adopts the process of hard chromium plating. The inlet seat is provided with a leakage hole, and when the rotary seal fails and leaks water, it can be discharged from the leakage hole. The main problems existing in its central waterway are as follows:

[0005] 1. The sealing form of the rotary seal is radial sealing. The non-coaxiality of the two ends of the central water pipe caused by processing errors and installation errors easily leads to premature failure of the chromium plating part of the central water pipe and the radial seal.

[0006] 2. The central water pipe and the sealing contact surface need to be chromium-plated, resulting in high production costs and long processing cycles.

[0007] 3. The coaxiality requirements for the two ends of the central water pipe are high, the machining accuracy requirements are high, the production costs are high, and the processing cycle is long.

[0008] 4. The leakage hole has an open structure. When the rotary seal fails and the spray water discharges from the leakage hole, it is not easy to be detected, resulting in untimely replacement of the failed part, which further leads to leakage of the spray water and causes emulsification of the lubricating oil of the planetary mechanism. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a rotary seal assembly and a central waterway system for a shearer rocker arm in view of the above-mentioned deficiencies in the prior art. By changing the rotary seal form from radial seal to a combination of end face seal and radial seal, and optimizing the central water pipe structure from an integral type to a combination of a central water pipe and a rotary sleeve, the stable transmission of the rotary motion of the central water pipe is realized. Through the compensation of the wear amount of the dynamic seal ring by the corrugated spring, the service life of the rotary seal is extended, the spray dust reduction effect of the coal mining face is improved. By changing the rotary seal form and the central water pipe structure form, the problem of premature failure of the central water pipe and the seal assembly in the central waterway of the prior art is solved, and the production cost of the central water pipe is reduced, and the processing cycle of the central water pipe is shortened.

[0010] To solve the above technical problems, the technical solution adopted by the present invention is: A rotary seal assembly for a shearer rocker arm, characterized in that: it includes a seal seat and a rotary sleeve installed in the seal seat through a bearing. A lip rotary seal is arranged between the seal seat and the rotary sleeve. A first leakage hole is opened on the seal seat. A spring support seat is sleeved outside the rotary sleeve. The spring support seat and the bearing are respectively located outside the two ends of the rotary sleeve. One end of the spring support seat is provided with a plurality of corrugated springs. A first radial O-ring is installed between the spring support seat and the rotary sleeve. A dynamic seal installation ring is sleeved outside the spring support seat. An inner retaining edge is arranged inside the dynamic seal installation ring. A second radial O-ring is installed between the spring support seat and the dynamic seal installation ring. The corrugated spring is supported between the spring support seat and the inner retaining edge. A dynamic seal ring is installed in the end of the dynamic seal installation ring by interference fit. A static seal ring is arranged on one side of the dynamic seal ring. An end face seal pair is formed between the dynamic seal ring and the static seal ring. The static seal ring is connected to the seal seat through two pin shafts. A third radial O-ring is installed between the static seal ring and the seal seat.

[0011] The above-mentioned rotary seal assembly for a shearer rocker arm is characterized in that: the bearing is axially limited by a hole retaining ring, and the rotary sleeve is axially limited by a first shaft retaining ring.

[0012] The above-mentioned swing arm rotary sealing assembly of a shearer is characterized in that: a plurality of spring mounting holes for mounting corrugated springs are formed in the spring support seat, the spring mounting holes communicate with one end of the spring support seat, one end of the corrugated spring abuts against the bottom of the spring mounting hole, and the other end of the corrugated spring supports on the inner retaining edge.

[0013] The above-mentioned swing arm rotary sealing assembly of a shearer is characterized in that: a connecting flange for connecting with the end cover of the central gear set of the shearer swing arm is arranged outside the sealing seat, a plurality of screw mounting holes are uniformly formed in the circumferential direction of the connecting flange, the inner end of the first leakage hole is located between the lip rotary seal and the shaft sleeve, the outer end of the first leakage hole communicates with one end of the connecting flange, an end face O-ring is arranged at one end of the connecting flange, the outer end of the first leakage hole is located inside the end face O-ring, and two fourth radial O-rings are arranged on the outer side of the sealing seat, and the two fourth radial O-rings are respectively arranged on both sides of the connecting flange.

[0014] The above-mentioned swing arm rotary sealing assembly of a shearer is characterized in that: the rotary sleeve is a multi-stage stepped structure, a central water pipe mounting groove and two key grooves are arranged inside one end of the rotary sleeve, and the key grooves communicate with the central water pipe mounting groove.

[0015] The above-mentioned swing arm rotary sealing assembly of a shearer is characterized in that: the spring support seat is connected with the rotary sleeve through two stepped pins, and the outer side of the stepped pins is radially limited by a second shaft retaining ring.

[0016] Meanwhile, the present invention also discloses a central water path system of a shearer swing arm, which is characterized in that: it includes at least one rotary sealing assembly as described in any one of the above, a water inlet seat fixed on the end cover of the central gear set of the shearer swing arm, a water outlet seat connected to the swing arm output shaft, and a central water pipe connected between the rotary sealing assembly and the water outlet seat, a water inlet joint is connected to the water inlet seat, a water inlet hose is connected to the water inlet joint, a water outlet joint is connected to the water outlet seat, a water outlet hose is connected to the water outlet joint, an articulated body is connected to the water outlet hose, and the articulated body is installed on the shearer helical drum.

[0017] The above-mentioned central water path system of a shearer swing arm is characterized in that: one end of the central water pipe is inserted into the rotary sleeve, the central water pipe is key-connected with the rotary sleeve through two keys, and a fifth radial O-ring is arranged between the central water pipe and the rotary sleeve.

[0018] The above-mentioned central water path system of a shearer swing arm is characterized in that: the other end of the central water pipe is inserted into the water outlet seat, a positioning pin is arranged between the central water pipe and the water outlet seat, and internal threads are arranged inside both ends of the central water pipe.

[0019] For the above-mentioned center waterway system of a shearer boom, it is characterized in that: a second leakage hole communicating with the first leakage hole is provided on the water inlet seat, and a humidity sensor is arranged at one end of the second leakage hole far from the first leakage hole.

[0020] The present invention has the following advantages compared with the prior art:

[0021] 1. The present invention improves the sealing form of the rotary seal from a single radial seal to a combination of end face seal and radial seal. Through water isolation by the end face seal and oil isolation by the radial seal, the oil-water separation of the rotary seal is realized. The main seal is an end face seal structure, which reduces the requirements for the installation error and processing error at both ends of the center water pipe of the rotary seal.

[0022] 2. The present invention adopts a combination of end face seal pairs of dynamic seal rings and static seal rings, and has a good sealing effect.

[0023] 3. The present invention uses multiple corrugated springs to push the dynamic seal ring, with strong structural stability. Through the compensation of the wear amount of the dynamic seal ring by the corrugated spring, the service life of the rotary seal is extended, and the spray dust reduction effect of the coal mining face is improved.

[0024] 4. The present invention reduces the volume of the component by reasonably optimizing the structure of the rotary seal assembly, so that the rotary seal assembly can be interchangeable for different models of shearers, reducing the production organization cost.

[0025] 5. The present invention optimizes the structure of the center water pipe from an integral type to a combination of a center water pipe and a rotary sleeve, thereby realizing the stable transmission of the rotary motion of the center water pipe. The rotary sleeve is effectively supported by bearings and self-lubricating bushings, providing a stable environment for the two-stage seal. Through the transition connection of O-rings, the requirements for the installation error and processing error at both ends of the center water pipe are reduced, the production cost of the center water pipe is reduced, and the chromium plating process on the outer surface of the center water pipe is omitted, shortening the processing cycle of the center water pipe and reducing its production cost.

[0026] In summary, the present invention changes the rotary seal form from radial seal to a combination of end face seal and radial seal, and optimizes the structure of the center water pipe from an integral type to a combination of a center water pipe and a rotary sleeve, realizing the stable transmission of the rotary motion of the center water pipe. Through the compensation of the wear amount of the dynamic seal ring by the corrugated spring, the service life of the rotary seal is extended, and the spray dust reduction effect of the coal mining face is improved. By changing the rotary seal form and the structure form of the center water pipe, the problem of premature failure of the center water pipe and the seal assembly in the prior art center waterway is solved, the production cost of the center water pipe is reduced, and the processing cycle of the center water pipe is shortened.

[0027] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0028] Figure 1 This is a schematic structural diagram of Embodiment 1 of the present invention.

[0029] Figure 2 This is a schematic structural diagram of Embodiment 2 of the present invention.

[0030] Figure 3 This is a schematic structural diagram of the central water pipe of the present invention.

[0031] Explanation of reference numerals in the drawings:

[0032] 1 - sealing seat; 1-1 - connecting flange; 1-2 - screw mounting hole;

[0033] 1-3 - first leakage hole; 2 - rotary sleeve; 2-1 - central water pipe mounting groove;

[0034] 2-2 - keyway; 3 - bearing; 4 - shaft sleeve;

[0035] 5 - lip rotary seal; 6 - hole retaining ring; 7 - first shaft retaining ring;

[0036] 8 - spring support seat; 9 - step pin; 10 - second shaft retaining ring;

[0037] 11 - corrugated spring; 12 - dynamic seal mounting ring; 12-1 - inner retaining edge;

[0038] 13 - dynamic seal ring; 14 - static seal ring; 15 - pin shaft;

[0039] 16 - first radial O-ring; 17 - second radial O-ring; 18 - third radial O-ring;

[0040] 19 - rocker output shaft; 20 - humidity sensor; 21 - first screw;

[0041] 22 - second screw; 23 - third screw; 24 - water inlet joint;

[0042] 25 - water outlet joint; 26 - water inlet hose; 27 - water outlet hose;

[0043] 28 - articulated body; 29 - central water pipe; 29-1 - key;

[0044] 29-2 - pin slot; 30 - water inlet seat; 30-1 - second leakage hole;

[0045] 31 - water outlet seat; 31-1 - positioning pin; 32 - end cover;

[0046] 33 - fourth radial O-ring; 34 - fifth radial O-ring; 35 - end face O-ring;

[0047] 36 - sixth radial O-ring. Detailed implementation mode

[0048] Embodiment 1

[0049] As Figure 1 shown, a swing arm rotary seal assembly for a shearer includes a seal seat 1 and a rotary sleeve 2 installed in the seal seat 1 through a bearing 3. A lip rotary seal 5 is arranged between the seal seat 1 and the rotary sleeve 2. A first leakage hole 1-3 is formed in the seal seat 1. A spring support seat 8 is sleeved outside the rotary sleeve 2. The spring support seat 8 and the bearing 3 are respectively located outside both ends of the rotary sleeve 2. One end of the spring support seat 8 is provided with a plurality of corrugated springs 11. A first radial O-ring 16 is installed between the spring support seat 8 and the rotary sleeve 2. A dynamic seal mounting ring 12 is sleeved outside the spring support seat 8. An inner side stop edge 12-1 is arranged inside the dynamic seal mounting ring 12. A second radial O-ring 17 is installed between the spring support seat 8 and the dynamic seal mounting ring 12. The corrugated springs 11 are supported between the spring support seat 8 and the inner side stop edge 12-1. A dynamic seal ring 13 is installed in the end of the dynamic seal mounting ring 12 by interference fit. A static seal ring 14 is arranged on one side of the dynamic seal ring 13. A face seal pair is formed between the dynamic seal ring 13 and the static seal ring 14. The static seal ring 14 is connected to the seal seat 1 through two pin shafts 15. A third radial O-ring 18 is installed between the static seal ring 14 and the seal seat 1.

[0050] During actual use, the seal form of the rotary seal is improved from a single radial seal to a combination of face seal and radial seal. Water is separated by the face seal and oil is separated by the radial seal to achieve the oil-water separation of the rotary seal. The main seal is a face seal structure, which reduces the requirements for the installation error and processing error at both ends of the central water pipe of the rotary seal.

[0051] It should be noted that the combination of the face seal pair of the dynamic seal ring 13 and the static seal ring 14 has a good seal effect.

[0052] During specific implementation, a plurality of corrugated springs 11 are used to push the dynamic seal ring 13, which has strong structural stability. Through the compensation of the wear amount of the dynamic seal ring 13 by the corrugated springs 11, the service life of the rotary seal is prolonged, and the spray dust suppression effect of the coal mining face is improved.

[0053] It should be noted that the rotary sleeve 2 adopts a multi-stage stepped structure. Since the outer part of the rotary sleeve 2 is utilized at the end where the spring support seat 8 is installed, and the inner part of the rotary sleeve 2 is utilized on the side where the central water pipe 29 is installed, making the rotary sleeve 2 into a stepped structure can compress the volume. The fixed spring support seat 8 is combined with two stepped pins 9 and a second shaft retaining ring 10, which can also reduce the volume. Using this self-lubricating bushing 4 to play the role of a bearing can also reduce the volume. By reasonably optimizing the structure of the rotary seal assembly and reducing the volume of the assembly, the rotary seal assembly can be interchangeable for different models of shearers, reducing the production organization cost.

[0054] During specific implementation, the bearing 3 adopts a ball bearing. The bushing 4 is located between the spring support seat 8 and the bearing 3, and the lip rotary seal 5 is located between the bushing 4 and the bearing 3. The bearing 3 is arranged at one end of the rotary sleeve 2 away from the end cover 32 of the central gear set of the shearer rocker arm.

[0055] It should be noted that the static seal ring 14 and the seal seat 1 are connected by two pin shafts 15, which can prevent the static seal ring 14 from rotating during operation. Both the static seal ring 14 and the seal seat 1 are provided with holes for installing the pin shaft 15, and both ends of the pin shaft 15 are inserted into the static seal ring 14 and the seal seat 1 respectively.

[0056] During specific implementation, a bushing 4 is further provided between the seal seat 1 and the rotary sleeve 2, and the inner side of the dynamic seal mounting ring 12 is in interference fit with the outer side of the dynamic seal ring 13.

[0057] In this embodiment, the fit between the bushing 4 and the rotary sleeve 2 is a tight fit, and the fit between the bushing 4 and the seal seat 1 is a clearance fit.

[0058] The bearing 3 is axially limited by a hole retaining ring 6, and the rotary sleeve 2 is axially limited by a first shaft retaining ring 7.

[0059] During actual use, the hole retaining ring 6 and the first shaft retaining ring 7 are respectively arranged at both ends of the bearing 3.

[0060] In this embodiment, the spring support seat 8 is provided with a plurality of spring mounting holes for installing the corrugated spring 11. The spring mounting holes communicate with one end of the spring support seat 8. One end of the corrugated spring 11 abuts against the bottom of the spring mounting hole, and the other end of the corrugated spring 11 supports on the inner retaining edge 12-1.

[0061] During actual use, the inside of the dynamic seal mounting ring 12 forms a three-stage stepped hole through the inner retaining edge 12-1, and the spring support seat 8 and the dynamic seal ring 13 are respectively located on both sides of the inner retaining edge 12-1.

[0062] It should be noted that a corrugated spring 11 is installed in each of the spring mounting holes. The corrugated spring 11 is arranged along the axial direction of the spring support seat 8. One end of the corrugated spring 11 extends out of the spring mounting hole and presses against one side of the inner retaining edge 12-1.

[0063] During specific implementation, one end of the dynamic seal ring 13 close to the static seal ring 14 extends to the outside of one end of the dynamic seal mounting ring 12.

[0064] In this embodiment, a connecting flange 1-1 for connecting with the end cover 32 of the central gear set of the shearer rocker arm is arranged on the outside of the seal seat 1. A plurality of screw mounting holes 1-2 are uniformly formed in the circumferential direction of the connecting flange 1-1. The inner end of the first leakage hole 1-3 is located between the lip rotary seal 5 and the shaft sleeve 4. The outer end of the first leakage hole 1-3 communicates with one end of the connecting flange 1-1. A face O-ring 35 is arranged at one end of the connecting flange 1-1. The outer end of the first leakage hole 1-3 is located within the face O-ring 35. Two fourth radial O-rings 33 are arranged on the outside of the seal seat 1, and the two fourth radial O-rings 33 are respectively arranged on both sides of the connecting flange 1-1.

[0065] During actual use, a face O-ring mounting groove for mounting the face O-ring 35 is formed on one end face of the connecting flange 1-1 close to the end cover 32, and the outer end of the first leakage hole 1-3 communicates with the face O-ring mounting groove.

[0066] During specific implementation, two radial O-ring mounting grooves for mounting the fourth radial O-rings 33 are formed on the outside of the seal seat 1.

[0067] In this embodiment, the rotary sleeve 2 is of a multi-stage stepped structure. A central water pipe mounting groove 2-1 and two key grooves 2-2 are arranged inside one end of the rotary sleeve 2, and the key grooves 2-2 communicate with the central water pipe mounting groove 2-1.

[0068] During actual use, the central water pipe mounting groove 2-1 and the rotary sleeve 2 are coaxially arranged. The key grooves 2-2 are located on the outer circle of the central water pipe mounting groove 2-1, and the two key grooves 2-2 are symmetrically arranged at one end of the rotary sleeve 2.

[0069] In this embodiment, the spring support seat 8 is connected to the rotary sleeve 2 through two stepped pins 9, and the outer side of the stepped pin 9 is radially limited by a second shaft retaining ring 10.

[0070] In specific implementation, the sealing seat 1, the rotary sleeve 2, the spring mounting seat 8, the dynamic seal mounting ring 12, and the stepped pin 9 are all made of stainless steel. The shaft sleeve 4 is a self-lubricating shaft sleeve. The static seal ring 13 is made of graphite, and the static seal ring 14 is made of silicon carbide. The outer surface of the rotary sleeve 2 that cooperates with the lip-type rotary seal 5 is subjected to silicon carbide spraying treatment.

[0071] Embodiment 2

[0072] As Figure 2 and Figure 3 shown, a central waterway system for a shearer boom includes the rotary seal assembly described in Embodiment 1, a water inlet seat 30 fixed on the end cover 32 of the central gear set of the shearer boom, a water outlet seat 31 connected to the output shaft 19 of the boom, and a central water pipe 29 connected between the rotary seal assembly and the water outlet seat 31. A water inlet joint 24 is connected to the water inlet seat 30, a water inlet hose 26 is connected to the water inlet joint 24, a water outlet joint 25 is connected to the water outlet seat 31, a water outlet hose 27 is connected to the water outlet joint 25, and an articulated body 28 is connected to the water outlet hose 27. The articulated body 28 is installed on the shearer helical drum.

[0073] During actual use, by optimizing the structure of the central water pipe from an integral type to a combination of the central water pipe 29 and the rotary sleeve 2, the stable transmission of the rotational motion of the central water pipe is realized. The rotary sleeve 2 is effectively supported by the bearing 3 and the self-lubricating shaft sleeve 4, providing a stable environment for the two-stage seal.

[0074] It should be noted that there is a gap between the central water pipe 29 and the rotary sleeve 2. The fifth radial O-ring 34 is used to make a transition connection between the central water pipe 29 and the rotary sleeve 2, which can play a static sealing role. If the centering of the central water pipe 29 is slightly off, there can be a compensation effect. At the same time, when using end face seals, the outer circle seal of the central water pipe 29 is not required, reducing the requirements for the installation error and processing error at both ends of the central water pipe 29, reducing the production cost of the central water pipe 29, and eliminating the chromium plating process on the outer surface of the central water pipe 29, shortening the processing cycle of the central water pipe 29 and reducing its production cost.

[0075] In specific implementation, the connection flange 1-1 of the rotary seal assembly is connected to the end cover 32 of the central gear set of the shearer boom through a plurality of first screws 21. The first screws 21 are installed in the screw installation holes 1-2. The water inlet seat 30 is fixed on the end cover 32 of the central gear set of the shearer boom through a plurality of second screws 22. The water outlet seat 31 is connected to the output shaft 19 of the boom through a third screw 23.

[0076] In specific implementation, two sixth radial O-rings 36 are provided between the water outlet seat 31 and the central water pipe 29, and between the water outlet seat 31 and the output shaft 19 of the boom.

[0077] It should be noted that the rocker arm output shaft 19 refers to the flange at the rotating end of the rocker arm output.

[0078] In this embodiment, one end of the central water pipe 29 is inserted into the rotary sleeve 2. The central water pipe 29 is key - connected to the rotary sleeve 2 through two keys 29 - 1, and a fifth radial O - ring 34 is arranged between the central water pipe 29 and the rotary sleeve 2.

[0079] During actual use, both keys 29 - 1 are fixedly installed on the central water pipe 29. One end of the central water pipe 29 is installed in the central water pipe installation groove 2 - 1. The keys 29 - 1 on the central water pipe 29 correspond to the key grooves 2 - 2 one by one and are assembled together, so that the central water pipe 29 is key - connected to the rotary sleeve 2 to ensure the stable transmission of the rotational movement of the central water pipe.

[0080] Specifically, the number of the fifth radial O - rings 34 is two.

[0081] In this embodiment, the other end of the central water pipe 29 is inserted into the water outlet seat 31. A positioning pin 31 - 1 is arranged between the central water pipe 29 and the water outlet seat 31, and internal threads are arranged at both ends of the central water pipe 29.

[0082] During actual use, by arranging internal threads at both ends of the central water pipe 29, the assembly process of the central water pipe is optimized, which is convenient for the disassembly and assembly of the central water pipe 29 through external threaded parts. And through reasonable structural design, both ends of the central water pipe 29 can be disassembled and assembled, reducing the installation difficulty of the components.

[0083] Specifically, the central water pipe 29 is made of stainless steel, and a pin slot 29 - 2 for inserting the positioning pin 31 - 1 is opened at the other end of the central water pipe 29.

[0084] In this embodiment, a second leakage hole 30 - 1 communicating with the first leakage hole 1 - 3 is opened on the water inlet seat 30, and a humidity sensor 20 is arranged at one end of the second leakage hole 30 - 1 far from the first leakage hole 1 - 3.

[0085] During actual use, by configuring the humidity sensor 20 at the outer end of the second leakage hole 30 - 1 and connecting the signal of the humidity sensor 20 to the main control box of the shearer, real - time feedback on the failure and water leakage of the rotary seal assembly is achieved. Thus, it is convenient to replace the failed seal in time, avoid further leakage of the spray water and its entry into the planetary mechanism to cause lubricating oil emulsification, extend the service life of the rocker arm, reduce the overhaul and maintenance time, and improve the production efficiency of the mine.

[0086] During the actual use of the present invention, the rocker arm housing remains stationary. The central gear set is installed inside the rocker arm housing. The water inlet seat 30 is installed on the end cover 32. The water inlet pipeline is connected to the water inlet seat 30 through the water inlet joint 24. All of these are stationary and are on the side of the rocker arm near the straight-tooth transmission of the arm body. Since the water inlet end is stationary and the water outlet end needs to be connected to the rotating drum, a rotary sealing structure is required for the central water path of the water supply. The rocker arm output shaft 19 drives the water outlet seat 31 to rotate. The water outlet seat 31 drives the central water pipe 29 to rotate. The central water pipe 29 drives the rotary sleeve 2 to rotate. The rotary sleeve 2 drives the spring support seat 8, the dynamic seal mounting ring 12 and the dynamic seal ring 13 to rotate. The seal seat 1 is fixed on the end cover 32 and is stationary. The static seal 14 is installed on the seal seat 1 and is also stationary. This forms an end face seal pair.

[0087] For the central water path of the traditional structure, the central water pipe also rotates, while the seal is stationary. The inner circle of the seal and the outer circle of the central water pipe form a seal pair, which is a radial seal. Moreover, the central water pipe has to pass through the middle of the entire planetary reducer, so it is a slender structure. This makes it difficult to ensure the coaxiality of the outer circles at both ends during processing, and the processing difficulty is large. In addition, there is gear lubricating oil in the planetary reducer. If the rotary seal fails and enters the planetary reducer, it will cause the gear lubricating oil to emulsify, affecting the normal operation and even causing the planetary reducer to lock up.

[0088] The above are only the preferred embodiments of the present invention and do not impose any limitations on the present invention. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A rotary seal assembly for a shearer boom, characterized in that: It includes a sealing seat (1) and a rotating sleeve (2) installed in the sealing seat (1) through a bearing (3). A lip rotary seal (5) is provided between the sealing seat (1) and the rotating sleeve (2). A first leakage hole (1-3) is opened on the sealing seat (1). A spring support seat (8) is sleeved outside the rotating sleeve (2). The spring support seat (8) and the bearing (3) are respectively located outside both ends of the rotating sleeve (2). One end of the spring support seat (8) is provided with a plurality of corrugated springs (11). A first radial O-ring (16) is installed between the spring support seat (8) and the rotating sleeve (2). A dynamic seal mounting ring (12) is sleeved outside the spring support seat (8). An inner retaining edge (12-1) is arranged inside the dynamic seal mounting ring (12). A second radial O-ring (17) is installed between the spring support seat (8) and the dynamic seal mounting ring (12). The corrugated spring (11) is supported between the spring support seat (8) and the inner retaining edge (12-1). A dynamic seal ring (13) is press-fitted inside one end of the dynamic seal mounting ring (12). A static seal ring (14) is arranged on one side of the dynamic seal ring (13). An end face seal pair is formed between the dynamic seal ring (13) and the static seal ring (14). The static seal ring (14) is connected to the sealing seat (1) through two pin shafts (15). A third radial O-ring (18) is installed between the static seal ring (14) and the sealing seat (1). A plurality of spring mounting holes for installing the corrugated springs (11) are opened on the spring support seat (8). The spring mounting holes communicate with one end of the spring support seat (8). One end of the corrugated spring (11) abuts against the bottom of the spring mounting hole. The other end of the corrugated spring (11) is supported on the inner retaining edge (12-1). A connection flange (1-1) for connecting with the end cover (32) of the central gear set of the shearer rocker arm is arranged outside the sealing seat (1). A plurality of screw mounting holes (1-2) are evenly opened along the circumferential direction of the connection flange (1-1). The inner end of the first leakage hole (1-3) is located between the lip rotary seal (5) and the shaft sleeve (4). The outer end of the first leakage hole (1-3) communicates with one end of the connection flange (1-1). An end face O-ring (35) is arranged at one end of the connection flange (1-1). The outer end of the first leakage hole (1-3) is located inside the end face O-ring (35). Two fourth radial O-rings (33) are arranged outside the sealing seat (1). The two fourth radial O-rings (33) are respectively arranged on both sides of the connection flange (1-1).

2. The rotating seal assembly of a shearer rocker arm according to claim 1, characterized in that: The bearing (3) is axially limited by a hole retaining ring (6). The rotating sleeve (2) is axially limited by a first shaft retaining ring (7).

3. A rotary sealing assembly for a shearer rocker arm according to claim 1, characterized in that: The rotating sleeve (2) is of a multi-stage stepped structure. A central water pipe installation groove (2-1) and two key grooves (2-2) are arranged inside one end of the rotating sleeve (2). The key grooves (2-2) communicate with the central water pipe installation groove (2-1).

4. A rotary seal assembly for a shearer boom according to claim 1, characterized in that: The spring support seat (8) is connected to the rotary sleeve (2) by two step pins (9), and the outer side of the step pin (9) is radially limited by a second shaft retaining ring (10).

5. A waterway system at the center of a shearer boom, characterized in that: It includes at least one rotary seal assembly as described in any one of claims 1 to 4, a water inlet seat (30) fixed on the end cover (32) of the central gear set of the shearer rocker arm, a water outlet seat (31) connected to the rocker arm output shaft (19), and a central water pipe (29) connected between the rotary seal assembly and the water outlet seat (31). A water inlet joint (24) is connected to the water inlet seat (30), a water inlet hose (26) is connected to the water inlet joint (24), a water outlet joint (25) is connected to the water outlet seat (31), a water outlet hose (27) is connected to the water outlet joint (25), and a hinge body (28) is connected to the water outlet hose (27). The hinge body (28) is installed on the shearer helical drum.

6. The center waterway system of a shearer rocker arm according to claim 5, characterized in that: One end of the central water pipe (29) is inserted into the rotary sleeve (2), the central water pipe (29) is key-connected to the rotary sleeve (2) through two keys (29-1), and a fifth radial O-ring (34) is arranged between the central water pipe (29) and the rotary sleeve (2).

7. The center waterway system of a shearer rocker arm according to claim 6, characterized in that: The other end of the central water pipe (29) is inserted into the water outlet seat (31), a positioning pin (31-1) is arranged between the central water pipe (29) and the water outlet seat (31), and internal threads are arranged at both ends of the central water pipe (29).

8. A center waterway system for a shearer rocker arm according to claim 5, characterized in that: A second leakage hole (30-1) communicating with the first leakage hole (1-3) is formed in the water inlet seat (30), and a humidity sensor (20) is arranged at one end of the second leakage hole (30-1) far from the first leakage hole (1-3).

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