An internal spraying water supply device of a coal mining machine adopting a flexible structure central water pipe

Abstract

The application discloses a coal mining machine internal spraying water supply device with a flexible structure central water pipe, which comprises a water inlet seat, a rotary sealing assembly, a water outlet seat and a flexible structure central water pipe connected between the rotary sealing assembly and the water outlet seat, the rotary sealing assembly comprises a sealing seat and a rotary sleeve, the water outlet seat comprises an adjusting seat and a joint seat, one end of the central water pipe is inserted into the rotary sleeve, the other end of the central water pipe is inserted into the joint seat, the central water pipe comprises a hose and two pipe joints, and the pipe joints are connected with the hose through outer sleeves. The central water pipe is arranged as a flexible structure central water pipe, the problem of early sealing failure caused by the eccentric wear between the outer surface of the water pipe and the rotary sealing due to the different shafts of the two ends of the central water pipe and the different shafts of the two end installation positions is solved, the internal spraying effect of the coal mining machine is ensured, the stability is good, the material cost and the processing cost of the central water pipe are greatly reduced, and the production cycle of the central water pipe is shortened.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of internal spraying of coal mining machine, and particularly relates to an internal spraying water supply device of coal mining machine adopting a flexible structure center water pipe. BACKGROUND

[0002] The internal spraying system of coal mining machine is an important system for realizing dust reduction, spark extinguishing and cooling of cutting picks on the working face. The water for internal spraying is introduced by a water inlet seat fixed on the end cover of the center gear of the rocker arm, enters the center water pipe passing through the middle inner cavity of the planetary reducer of the rocker arm, is introduced out of the water outlet seat fixed on the rotating cutting square head, is connected to the cutting drum, and is sprayed out by the multiple groups of nozzles arranged on the drum. Since the cutting drum rotates, one end of the center water pipe needs to be a rotating sealing structure. The failure of the rotating sealing will affect the spraying water supply pressure, thereby affecting the spraying dust reduction effect of the coal mining machine, leading to the deterioration of the labor environment of the coal mining working face. Moreover, the center water pipe needs to pass through the lubricating oil working area of the planetary mechanism of the coal mining machine. When the rotating sealing of the center water pipe fails, the spraying water will mix with the lubricating oil, leading to the emulsification of the lubricating oil, affecting the normal work of the planetary mechanism, and even causing the failure of the planetary mechanism, seriously affecting the normal use of the coal mining machine, thereby reducing the coal mining efficiency and increasing the use cost of the equipment.

[0003] The conventional structure internal spraying water supply device of coal mining machine is composed of a water inlet seat, a rotating sealing, a center water pipe and a water outlet seat. The water inlet seat and the rotating sealing assembly are installed on the center gear end cover, the water outlet seat is installed on the rotating cutting square head, the center water pipe is an elongated hollow pipe, one end of which is inserted into the middle part of the water outlet seat, is sealed by an O-ring, and is driven to rotate by the water outlet seat, the other end of which is inserted into the rotating sealing assembly, and the outer surface thereof forms a rotating sealing pair with the radial water seal fixedly installed inside the rotating sealing assembly. According to the anti-rust requirement of the center water pipe, the material thereof is mostly selected to be stainless steel. In order to increase the wear resistance, the outer surface of the center water pipe in contact with the radial water seal is plated with hard chromium. In summary, the main problems of the internal spraying water supply device of the coal mining machine in the prior art are as follows:

[0004] 1. The water inlet seat and the water outlet seat for installing the center water pipe are easily out of alignment due to machining errors, installation errors and the like, causing the center water pipe and the sealing to be eccentrically worn, and leading to the premature failure of the outer surface of the center water pipe and the radial sealing;

[0005] 2. The center water pipe is limited by the structural properties of the slender shaft, and after processing, the two ends of the center water pipe are easily out of alignment, causing the center water pipe and the sealing to be eccentrically worn, and leading to the premature failure of the outer surface of the center water pipe and the radial sealing. Moreover, the center water pipe requires high machining precision, high production cost and long processing cycle;

[0006] 3. The contact surface of the center water pipe and the sealing needs to be plated with chromium, which is high in production cost and long in processing cycle. SUMMARY

[0007] The technical problem solved by the present application is to provide an internal spraying water supply device of a coal mining machine with a flexible structure center water pipe, which solves the problem of premature failure of the seal caused by the eccentric wear between the outer surface of the center water pipe and the rotary seal due to the eccentricity of the two ends of the center water pipe and the eccentricity of the installation of the two ends, ensures the normal water supply of the internal spraying system of the coal mining machine, and thus ensures the internal spraying effect of the coal mining machine.

[0008] To solve the above technical problems, the technical scheme adopted by the present application is: an internal spraying water supply device of a coal mining machine with a flexible structure center water pipe, characterized in that: it comprises a water inlet seat and a rotary sealing assembly fixed on the end cover of the center gear set of the rocker arm of the coal mining machine, a water outlet seat connected to the rocker arm outlet shaft, and a flexible structure center water pipe connected between the rotary sealing assembly and the water outlet seat, the rotary sealing assembly comprises a sealing seat and a rotary sleeve installed in the sealing seat through a bearing and a shaft sleeve, the water outlet seat comprises an adjusting seat connected to the rocker arm outlet shaft and a joint seat arranged in the adjusting seat and used for connecting with the center water pipe, one end of the center water pipe is inserted into the rotary sleeve, the other end of the center water pipe is inserted into the joint seat, the inside of the rotary sleeve and the inside of the joint seat are both provided with a key for key connection with the center water pipe, the adjusting seat is provided with a plurality of top screws for tensioning the center water pipe, and the inner end of the top screw is in tight contact with the rocker arm outlet shaft.

[0009] The center water pipe comprises a hose and two pipe joints arranged at the two ends of the hose, the pipe joints and the hose are connected through an outer sleeve, and the rotary sleeve and one of the pipe joints are limited through a U-shaped clamp, and the joint seat and the other pipe joint are also limited through a U-shaped clamp.

[0010] The adjusting seat and the rocker arm outlet shaft are provided with a sealing ring therebetween, and the adjusting seat and the joint seat are also provided with a sealing ring therebetween.

[0011] The internal spraying water supply device of the coal mining machine with the flexible structure center water pipe has the characteristics that a first leakage hole is formed in the sealing seat, a spring support seat is arranged outside the rotating sleeve, the spring support seat and the bearing are respectively arranged outside the two ends of the rotating sleeve, a plurality of corrugated springs are arranged at one end of the spring support seat, a first radial O-shaped ring is arranged between the spring support seat and the rotating sleeve, a dynamic sealing installation ring is arranged outside the spring support seat, an inner side stop rib is arranged in the dynamic sealing installation ring, a second radial O-shaped ring is arranged between the spring support seat and the dynamic sealing installation ring, the corrugated springs are supported between the spring support seat and the inner side stop rib, a dynamic sealing ring is arranged at one end of the dynamic sealing installation ring in a form of interference, a static sealing ring is arranged at one side of the dynamic sealing ring, an end face sealing pair is formed between the dynamic sealing ring and the static sealing ring, the static sealing ring is connected with the sealing seat through two pin shafts, and a third radial O-shaped ring is arranged between the static sealing ring and the sealing seat.

[0012] The internal spraying water supply device of the coal mining machine with the flexible structure center water pipe has the characteristics that a plurality of spring installation holes for installing the corrugated springs are formed in the spring support seat, the spring installation holes are in communication with one end of the spring support seat, one end of the corrugated spring is connected to the bottom of the spring installation hole, and the other end of the corrugated spring is pressed on the inner side stop rib.

[0013] The internal spraying water supply device of the coal mining machine with the flexible structure center water pipe has the characteristics that a connecting flange for connecting with the end cover of the center gear set of the rocker arm of the coal mining machine is arranged outside the sealing seat, a plurality of screw installation holes are uniformly formed in the connecting flange in the circumferential direction, the inner end of the first leakage hole is located between the lip-shaped rotary seal and the shaft sleeve, the outer end of the first leakage hole is in communication with one end of the connecting flange, one end of the connecting flange is provided with an end face O-shaped ring, the outer end of the first leakage hole is located in the end face O-shaped ring, and two fourth radial O-shaped rings are arranged outside the sealing seat and are arranged on the two sides of the connecting flange.

[0014] The spring support seat is connected with the rotating sleeve through two stepped pins, and the outer side of the stepped pin is limited in the radial direction by a second shaft stop ring.

[0015] The internal spraying water supply device of the coal mining machine with the flexible structure center water pipe has the characteristics that the pipe joint is a steel joint, a key groove matched with the key is arranged on the pipe joint, and two sealing ring installation grooves and a U-shaped clamping limiting groove are arranged on the pipe joint.

[0016] The water supply device for the internal spraying of the coal mining machine with the flexible structure center water pipe has the following characteristics: the hose comprises a synthetic rubber inner rubber layer, a synthetic rubber protective layer and one or more steel wire woven increase layers arranged between the synthetic rubber inner rubber layer and the synthetic rubber protective layer; when the hose comprises the multiple steel wire woven increase layers, the rubber separation layer is arranged between the adjacent two steel wire woven increase layers.

[0017] The water supply device for the internal spraying of the coal mining machine with the flexible structure center water pipe has the following characteristics: one end of the adjusting seat is a flange plate for connecting with the rocker arm output shaft, the flange plate and the rocker arm output shaft are connected through the third screw; the outside of the joint seat is in a stepped shape, and the hole in the adjusting seat for installing the joint seat is in a stepped structure.

[0018] The water supply device for the internal spraying of the coal mining machine with the flexible structure center water pipe has the following characteristics: one end of the joint seat and one end of the rotary sleeve are provided with two U-shaped clamping holes, the other end of the joint seat is threadedly connected with the elbow, the third shaft stopper is arranged on the joint seat and located at the end of the adjusting seat away from the center water pipe.

[0019] The water supply device for the internal spraying of the coal mining machine with the flexible structure center water pipe has the following characteristics: the water inlet pipeline is further arranged, the water inlet joint is arranged between the water inlet pipeline and the water inlet seat, the other end of the joint seat is connected with the water outlet pipeline through the elbow, the hinged body is arranged on the water outlet pipeline, and the hinged body is arranged on the spiral drum of the coal mining machine.

[0020] The water supply device for the internal spraying of the coal mining machine with the flexible structure center water pipe has the following characteristics: the second leakage hole is arranged on the water inlet seat and connected with the first leakage hole, and the humidity sensor is arranged at the end of the second leakage hole away from the first leakage hole.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. The center water pipe of the water supply device for the internal spraying of the coal mining machine is changed from the existing slender stainless steel pipe to the flexible structure center water pipe, which completely solves the problem of the early failure of the seal caused by the eccentric wear between the outer surface of the water pipe and the rotary seal due to the different shafts of the two ends of the center water pipe and the different shafts of the two end installation positions, ensures the normal water supply of the internal spraying system of the coal mining machine, and ensures the internal spraying effect of the coal mining machine.

[0023] 2. By changing the structure of the central water pipe from the existing slender stainless steel pipe to a flexible central water pipe, the present invention significantly reduces the material cost of the central water pipe and eliminates the chrome plating process on the outer surface of the central water pipe, saving water pipe processing costs and shortening its production cycle.

[0024] 3. The present invention connects the connector seat to the rocker arm output shaft through the adjusting seat, and at the same time, multiple set screws for tensioning the central water pipe are provided on the adjusting seat, which can flexibly adjust the tension of the central water pipe, thereby improving the adaptability of the device to the length error of the flexible structure central water pipe and ensuring the normal tensioning operation of the flexible structure central water pipe.

[0025] 4. This invention optimizes the central water pipe structure from an integral type to a combination of a central water pipe and a rotating sleeve, thereby achieving stable transmission of the rotational motion of the central water pipe. The rotating sleeve is effectively supported by bearings and self-lubricating bushings, providing a stable environment for the two-stage seal.

[0026] In summary, this invention completely solves the problem of premature seal failure caused by uneven wear between the outer surface of the water pipe and the rotary seal due to misalignment of the central water pipe's two ends and the installation points at both ends, by replacing the existing slender stainless steel pipe with a flexible structure water pipe. This ensures the normal water supply to the spray system inside the coal mining machine, thereby guaranteeing the spray effect within the machine. Simultaneously, the two ends of the central water pipe are keyed to the rotating sleeve and the connector seat, respectively, achieving stable transmission of the central water pipe's rotational motion with good stability. Furthermore, the use of a flexible water pipe significantly reduces the material and processing costs of the central water pipe and shortens its production cycle.

[0027] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

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

[0029] Figure 2 This is a schematic diagram of the central water pipe of the present invention.

[0030] Figure 3 for Figure 2 AA sectional view.

[0031] Figure 4 This is a schematic diagram of the connector seat of the present invention.

[0032] Figure 5 This is a schematic diagram of the rotary sealing assembly of the present invention.

[0033] Figure 6 This is a schematic diagram of the structure of the rotating sleeve of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1—Sealing seat; 1-1—Connecting flange; 1-2—Screw mounting holes;

[0036] 1-3—First leakage hole; 2—Spinning sleeve; 3—Bearing;

[0037] 4—Shaft sleeve; 5—Lip seal; 6—Bore retaining ring;

[0038] 7—First shaft retaining ring; 8—Spring support seat; 9—Step pin;

[0039] 10—Second shaft retaining ring; 11—Wave spring; 12—Dynamic seal mounting ring;

[0040] 12-1—Inner retaining edge; 13—Dynamic sealing ring; 14—Static sealing ring;

[0041] 15—Pin; 16—First radial O-ring; 17—Second radial O-ring;

[0042] 18—Third radial O-ring; 19—Rocker arm output shaft; 20—Humidity sensor;

[0043] 21—First screw; 22—Second screw; 23—Third screw;

[0044] 24—Water inlet connector; 25—Elbow; 26—Water inlet pipe;

[0045] 27—Outlet water pipe; 28—Hinged joint; 29—Central water pipe;

[0046] 29-1—Hose; 29-1-1—Inner layer of synthetic rubber;

[0047] 29-1-2—Synthetic rubber protective layer; 29-1-3—Steel wire braided reinforcing layer;

[0048] 29-1-4—Rubber separation layer; 29-2—Pipe fitting; 29-2-1—Keyway;

[0049] 29-2-2—Sealing ring mounting groove; 29-2-3—U-shaped retaining groove;

[0050] 29-3—Casing; 30—Inlet seat; 30-1—Second leakage hole;

[0051] 31—Adjusting seat; 32—End cap; 33—Fourth radial O-ring;

[0052] 34—Fifth radial O-ring; 35—End face O-ring; 36—Sixth radial O-ring;

[0053] 37—Connector seat; 38—Key; 39—Set screw;

[0054] 40—U-shaped clip; 41—Sealing ring; 42—Retaining ring for the third shaft;

[0055] 43—U-shaped card mounting hole. Detailed Implementation

[0056] like Figures 1 to 6 As shown, the present invention includes a water inlet seat 30 and a rotary sealing assembly fixed on the end cover 32 of the central gear set of the rocker arm of a coal mining machine, a water outlet seat connected to the rocker arm output shaft 19, and a flexible central water pipe 29 connected between the rotary sealing assembly and the water outlet seat 31. The rotary sealing assembly includes a sealing seat 1 and a rotating sleeve 2 installed in the sealing seat 1 via a bearing 3 and a bushing 4. The water outlet seat includes an adjusting seat 31 connected to the rocker arm output shaft 19 and a connector seat 37 disposed in the adjusting seat 31 for connection with the central water pipe 29. One end of the central water pipe 29 is inserted into the rotating sleeve 2, and the other end of the central water pipe 29 is inserted into the connector seat 37. Both the interior of the rotating sleeve 2 and the interior of the connector seat 37 are provided with keys 38 for key connection with the central water pipe 29. The adjusting seat 31 is provided with a plurality of set screws 39 for tensioning the central water pipe 29, and the inner end of the set screws 39 is pressed against the rocker arm output shaft 19.

[0057] The central water pipe 29 includes a flexible hose 29-1 and two pipe fittings 29-2 respectively disposed at both ends of the flexible hose 29-1. The pipe fittings 29-2 are connected to the flexible hose 29-1 through an outer sleeve 29-3. The rotating sleeve 2 is limited by a U-shaped clip 40 between itself and one of the pipe fittings 29-2, and the fitting seat 37 is limited by the other pipe fitting 29-2.

[0058] A sealing ring 41 is provided between the adjusting seat 31 and the rocker arm output shaft 19, and between the adjusting seat 31 and the connector seat 37. The sealing ring 41 is an O-ring.

[0059] In actual use, the central water pipe 29 in the spray water supply device inside the coal mining machine is changed from the existing slender stainless steel pipe to a flexible central water pipe 29. This completely solves the problem of premature seal failure caused by uneven wear between the outer surface of the water pipe and the rotary seal due to the misalignment of the two ends of the central water pipe 29 and the misalignment of the installation points at both ends. This ensures the normal water supply of the spray system inside the coal mining machine, thereby ensuring the spray effect inside the coal mining machine. At the same time, the two ends of the central water pipe 29 are connected to the rotating sleeve 2 and the connector seat 37 respectively through key fit, realizing the stable transmission of the rotational motion of the central water pipe 29, with good stability.

[0060] In practice, the flexible central water pipe 29 can withstand a certain water pressure and a certain torque.

[0061] It should be noted that by changing the structure of the central water pipe 29 from the existing slender stainless steel pipe to a flexible structure, the material cost of the central water pipe 29 is significantly reduced, and the chrome plating process on the outer surface of the central water pipe is eliminated, saving water pipe processing costs and shortening its production cycle.

[0062] In actual use, the connector seat 37 is connected to the rocker arm output shaft 19 through the adjusting seat 31. At the same time, multiple set screws 39 for tensioning the central water pipe 29 are provided on the adjusting seat 31, which can flexibly adjust the tension of the central water pipe 29, thereby improving the adaptability of the device to the length error of the flexible structure central water pipe and ensuring the normal tensioning operation of the flexible structure central water pipe.

[0063] It should be noted that the hole inside the adjusting seat 31 for installing the connector seat 37 has a stepped structure, which facilitates the installation of the connector seat 37 inside the adjusting seat 31. The set screw 39 is used to tighten the central water pipe 29 and leave a certain adjustment range. O-rings are installed in the two sealing ring mounting grooves 29-1-2 opened on the outer circle of the end of the adjusting seat 31 away from the flange 31-1 to accommodate this adjustment range.

[0064] In actual use, by optimizing the central water pipe structure from an integral type to a combination of central water pipe 29 and rotating sleeve 2, the stable transmission of the rotational motion of the central water pipe is achieved. The rotating sleeve 2 is effectively supported by bearing 3 and self-lubricating bushing 4, providing a stable environment for the two-stage seal.

[0065] In specific implementation, one end of the central water pipe 29 is inserted into the rotating sleeve 2, and a fifth radial O-ring 34 is provided between the central water pipe 29 and the rotating sleeve 2, as well as between the central water pipe 29 and the connector seat 37.

[0066] It should be noted that there is a gap between the central water pipe 29 and the rotating sleeve 2. The central water pipe 29 and the rotating sleeve 2 are transitionally connected by the fifth radial O-ring 34, which can play a static sealing role. If the centering of the central water pipe 29 is slightly off, it can have a compensating effect. At the same time, if the end face seal is used, the outer circle seal of the central water pipe 29 is not needed, which reduces the requirements for installation and processing errors at both ends of the central water pipe 29, reduces the production cost of the central water pipe 29, and eliminates the chrome plating process on the outer surface of the central water pipe 29, shortens the processing cycle of the central water pipe 29, and reduces its production cost.

[0067] like Figure 1 and Figure 5As shown, in this embodiment, a lip-shaped rotary seal 5 is provided between the sealing seat 1 and the rotary sleeve 2. The sealing seat 1 has a first leakage hole 1-3. A spring support seat 8 is sleeved on the outside of the rotary sleeve 2. The spring support seat 8 and the bearing 3 are located on the outside of both ends of the rotary sleeve 2, respectively. A plurality of corrugated springs 11 are provided at one end of the spring support seat 8. A first radial O-ring 16 is installed between the spring support seat 8 and the rotary sleeve 2. A dynamic sealing mounting ring 12 is sleeved on the outside of the spring support seat 8. An inner retaining edge 1 is provided inside the dynamic sealing mounting ring 12. 2-1, a second radial O-ring 17 is installed between the spring support seat 8 and the dynamic sealing mounting ring 12. The corrugated spring 11 is supported between the spring support seat 8 and the inner flange 12-1. A dynamic sealing ring 13 is interference-fitted inside one end of the dynamic sealing mounting ring 12. A static sealing ring 14 is provided on one side of the dynamic sealing ring 13. An end face sealing pair is formed between the dynamic sealing ring 13 and the static sealing ring 14. The static sealing ring 14 is connected to the sealing seat 1 through two pins 15. A third radial O-ring 18 is installed between the static sealing ring 14 and the sealing seat 1.

[0068] In practical applications, the rotary seal's sealing method has been improved from a single radial seal to a combination of end-face and radial seals. The end-face seal isolates water, while the radial seal isolates oil, achieving oil-water separation in the rotary seal. The main seal is an end-face seal structure, reducing the rotary seal's requirements for installation and machining errors at both ends of the central water pipe.

[0069] It should be noted that the combination of the end face sealing pair of the dynamic sealing ring 13 and the static sealing ring 14 provides a good sealing effect.

[0070] In practice, multiple corrugated springs 11 are used to push the sealing ring 13, which has strong structural stability. By compensating for the wear of the dynamic sealing ring 13 by the corrugated springs 11, the service life of the rotary seal is extended and the dust suppression effect of the coal mining face is improved.

[0071] It should be noted that the rotary sleeve 2 adopts a multi-stage stepped structure. This is because the side where the spring support seat 8 is installed utilizes the outside of the rotary sleeve 2, while the side where the central water pipe 29 is installed utilizes the inside of the rotary sleeve 2. Making the rotary sleeve 2 into a stepped structure can reduce its volume. The fixed spring support seat 8 is composed of two stepped pins 9 and a second shaft retaining ring 10, which can also reduce its volume. The use of this self-lubricating bushing 4, which acts as a bearing, also reduces its volume. By reasonably optimizing the structure of the rotary seal assembly, the volume of the assembly is reduced, making the rotary seal assembly interchangeable with different models of coal mining machines, thus reducing production organization costs.

[0072] In specific implementation, bearing 3 is a ball bearing, bushing 4 is located between spring support seat 8 and bearing 3, lip seal 5 is located between bushing 4 and bearing 3, and bearing 3 is arranged on the end of the end cover 32 of the rotating sleeve 2 away from the center gear set of the coal mining machine rocker arm.

[0073] It should be noted that the connection between the static sealing ring 14 and the sealing seat 1 via two pins 15 can prevent the static sealing ring 14 from rotating during operation. Both the static sealing ring 14 and the sealing seat 1 have holes for the pins 15 to be installed, and the two ends of the pins 15 are respectively inserted into the static sealing ring 14 and the sealing seat 1.

[0074] In specific implementation, the connecting flange 1-1 of the rotary sealing assembly is connected to the end cover 32 of the central gear set of the rocker arm of the coal mining machine through multiple first screws 21. The first screws 21 are installed in the screw mounting holes 1-2. The water inlet seat 30 is fixed to the end cover 32 of the central gear set of the rocker arm of the coal mining machine through multiple second screws 22. The water outlet seat 31 is connected to the rocker arm outlet shaft 19 through third screws 23.

[0075] It should be noted that rocker arm output shaft 19 refers to the flange at the output end of the rocker arm.

[0076] In this embodiment, the bearing 3 is axially limited by the retaining ring 6, the rotating sleeve 2 is axially limited by the first shaft retaining ring 7, and the spring support seat 8 is provided with a plurality of spring mounting holes for installing the corrugated spring 11. The spring mounting holes are connected to one end of the spring support seat 8, one end of the corrugated spring 11 is connected to the bottom of the spring mounting hole, and the other end of the corrugated spring 11 is pressed against the inner retaining edge 12-1.

[0077] In actual use, the bushing 4 and the rotating sleeve 2 are tightly fitted, and the bushing 4 and the sealing seat 1 are clearance fitted.

[0078] The bearing 3 is axially limited by the retaining ring 6, and the rotating sleeve 2 is axially limited by the first shaft retaining ring 7.

[0079] In actual use, the retaining ring 6 for the hole and the retaining ring 7 for the first shaft are respectively arranged at both ends of the bearing 3.

[0080] In actual use, the interior of the dynamic sealing mounting ring 12 forms a three-section stepped hole through the inner side flange 12-1, and the spring support seat 8 and the dynamic sealing ring 13 are located on both sides of the inner side flange 12-1 respectively.

[0081] 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 into the spring mounting hole and presses against one side of the inner flange 12-1.

[0082] In practice, the end of the dynamic sealing ring 13 closest to the static sealing ring 14 extends to the outer side of one end of the dynamic sealing mounting ring 12.

[0083] In this embodiment, the sealing seat 1 is provided with a connecting flange 1-1 for connecting to the end cover 32 of the center gear set of the coal mining machine rocker arm. The connecting flange 1-1 is provided with a plurality of screw mounting holes 1-2 evenly distributed along its circumference. The inner end of the first leakage hole 1-3 is located between the lip seal 5 and the bushing 4. The outer end of the first leakage hole 1-3 is connected to one end of the connecting flange 1-1. One end of the connecting flange 1-1 is provided with an end face O-ring 35. The outer end of the first leakage hole 1-3 is located inside the end face O-ring 35. The outer side of the sealing seat 1 is provided with two fourth radial O-rings 33. The two fourth radial O-rings 33 are respectively arranged on both sides of the connecting flange 1-1.

[0084] The spring support seat 8 is connected to the rotating sleeve 2 via two stepped pins 9, and the outer side of the stepped pins 9 is radially limited by the second shaft retaining ring 10.

[0085] In actual use, an end face O-ring mounting groove for mounting the end face O-ring 35 is provided on one end face of the connecting flange 1-1 near the end cover 32, and the outer end of the first leakage hole 1-3 is in communication with the end face O-ring mounting groove.

[0086] In specific implementation, two radial O-ring mounting grooves for mounting the fourth radial O-ring 33 are opened on the outer side of the sealing seat 1.

[0087] The rotating sleeve 2 has a multi-stage stepped structure.

[0088] In specific implementation, the sealing seat 1, the rotating sleeve 2, the spring mounting seat 8, the dynamic sealing mounting ring 12, and the stepped pin 9 are all made of stainless steel, the bushing 4 is a self-lubricating bushing, the static sealing ring 13 is made of graphite, the static sealing ring 14 is made of silicon carbide, and the outer surface of the rotating sleeve 2 that mates with the lip-shaped rotating seal 5 is treated with silicon carbide spraying.

[0089] like Figures 1 to 3 As shown, in this embodiment, the pipe connector 29-2 is a steel connector. The pipe connector 29-2 is provided with a keyway 29-2-1 that mates with the key 38. The pipe connector 29-2 is provided with a sealing ring mounting groove 29-2-2 for mounting the fifth radial O-ring 34 and a U-shaped retaining groove 29-2-3.

[0090] In actual use, the key 38 inside the rotating sleeve 2 and the connector seat 37 respectively mates with the keyway 29-2-1 on the two pipe connectors 29-2, thereby playing a role in preventing rotation. Both the rotating sleeve 2 and the connector seat 37 are provided with two keys 38, and each pipe connector 29-2 is provided with two keyways 29-2-1.

[0091] In practice, the fifth radial O-ring 34 is installed in the sealing ring mounting groove 29-2-2.

[0092] It should be noted that the pipe fitting 29-2 adopts a two-stage stepped fitting. The diameter of the end of the pipe fitting 29-2 closest to the hose 29-1 is larger than the diameter of the end of the pipe fitting 29-2 furthest from the hose 29-1. The keyway 29-2-1 and the sealing ring mounting groove 29-2-2 are both located at the small diameter end of the pipe fitting 29-2. The sealing ring mounting groove 29-2-2 is located near the large diameter end of the pipe fitting 29-2. The U-shaped retaining groove 29-2-3 is located at the large diameter end of the pipe fitting 29-2.

[0093] like Figure 2 As shown, in this embodiment, the hose 29-1 includes a synthetic rubber inner layer 29-1-1, a synthetic rubber protective layer 29-1-2, and one or more steel wire braided reinforcing layers 29-1-3 disposed between the synthetic rubber inner layer 29-1-1 and the synthetic rubber protective layer 29-1-2. When the hose 29-1 includes multiple steel wire braided reinforcing layers 29-1-3, a rubber separation layer 29-1-4 is disposed between two adjacent steel wire braided reinforcing layers 29-1-3.

[0094] In actual use, the 29-1 hose is actually a steel wire braided hydraulic hose. Depending on the number of steel wire braids, it can be single-layered, double-layered, triple-layered, or up to four-layered. The more steel wire layers, the stronger the hose's pressure resistance and bending resistance, and correspondingly, the larger the outer diameter. Generally, hydraulic systems can reach pressures of 30MPa to 40MPa, so a four-layered hose is chosen. Water systems have a maximum pressure of 10MPa, so a double-layered structure is sufficient. Single-layered hoses have lower strength and are less commonly used. These different layers in this type of steel wire braided hydraulic hose exist to accommodate the number of steel wire braids. For a single layer, there is only an inner layer, a braided layer, and a protective layer. The synthetic rubber inner layer 29-1-1 is in direct contact with the medium, and the synthetic rubber protective layer 29-1-2 is actually the outermost layer. If there are two or more braided layers, there will be a rubber separation layer 29-1-4 between the coal seam braided layers.

[0095] In this embodiment, one end of the adjusting seat 31 is a flange 31-1 for connecting with the rocker arm output shaft 19. Two sealing ring mounting grooves for installing sealing rings 41 are provided on the outer circle of the adjusting seat 31 away from the flange 31-1. The flange 31-1 and the rocker arm output shaft 19 are connected by a third screw 23. The exterior of the connector seat 37 is stepped, and the hole inside the adjusting seat 31 for installing the connector seat 37 is stepped.

[0096] In actual use, the flange 31-1 is provided with multiple set screw holes and third screw mounting holes, which are arranged alternately, and multiple set screw holes and third screw mounting holes are arranged on the same circumference.

[0097] In specific implementation, two sealing ring mounting grooves for installing the sealing ring 41 are provided on the outer circle of the connector seat 37.

[0098] like Figure 4 and Figure 6 As shown, in this embodiment, two U-shaped clip mounting holes 43 are provided at one end of the connector seat 37 and one end of the rotary sleeve 2. The other end of the connector seat 37 is threadedly connected to the elbow 25. A third shaft retaining ring 42 is provided on the connector seat 37. The third shaft retaining ring 42 is located on the adjusting seat 31 at the end away from the central water pipe 29.

[0099] In actual use, a central water pipe mounting hole is provided inside one end of the rotating sleeve 2 and inside one end of the connector seat 37. The connector seat 37 is installed inside the adjusting seat 31 and is axially limited by the third shaft retaining ring 42.

[0100] In specific implementation, when installing the central water pipe 29, the two pipe fittings 29-2 at both ends of the central water pipe 29 are respectively inserted into the fitting seat 37 and the rotating sleeve 2, and the keys 38 inside the rotating sleeve 2 and the fitting seat 37 are respectively assembled with the keyways 29-2-1 on the two pipe fittings 29-2. Then, the two pipe fittings 29-2 are connected to the fitting seat 37 and the rotating sleeve 2 respectively by two U-shaped clips 40. When installing the U-shaped clips 40, the two ends of the U-shaped clips 40 are respectively inserted into the two U-shaped clip mounting holes 43 on the fitting seat 37 or the rotating sleeve 2, and then continued downward, so that the two ends of the U-shaped clips 40 are inserted and limited in the U-shaped clip limiting grooves 29-2-3 on the pipe fittings 29-2. At this time, the two ends of the U-shaped clips 40 are located on both sides of the pipe fittings 29-2.

[0101] In this embodiment, a water inlet pipe 26 is also included. A water inlet connector 24 is connected between the water inlet pipe 26 and the water inlet seat 30. The other end of the connector seat 37 is connected to the water outlet pipe 27 through an elbow 25. A hinge body 28 is connected to the water outlet pipe 27. The hinge body 28 is installed on the spiral drum of the coal mining machine.

[0102] In specific implementation, a sixth radial O-ring 36 is provided between the connector seat 37 and the elbow 25.

[0103] In this embodiment, the water inlet seat 30 is provided with a second leakage hole 30-1 that communicates with the first leakage hole 1-3, and a humidity sensor 20 is provided at the end of the second leakage hole 30-1 that is away from the first leakage hole 1-3.

[0104] In actual use, by configuring a humidity sensor 20 at the outer end of the second leakage hole 30-1, the signal of the humidity sensor 20 is connected to the main control box of the coal mining machine, which realizes real-time feedback on the failure and leakage of the rotary sealing component. This facilitates timely replacement of the failed seal, prevents further leakage of spray water and its entry into the planetary mechanism, which would cause lubricating oil emulsification, extend the service life of the rocker arm, reduce maintenance time, and improve the mine's production efficiency.

[0105] In actual use, when the coal mining machine is working, the water inlet seat 30 and the sealing seat 1 and static sealing ring 14 in the rotary sealing assembly are stationary with the end cover 32. The adjusting seat 31 rotates with the rocker arm output shaft 19 and drives the joint seat 37, the central water pipe 29, the rotary sleeve 2, the spring support seat 8, the dynamic sealing mounting ring 12 and the dynamic sealing ring 13 in the rotary sealing assembly to rotate, thereby forming an end face sealing pair for sealing. During the operation, the tension of the central water pipe 29 can be adjusted by the set screw 39 in conjunction with the third screw 23.

[0106] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A coal mining machine internal spray water supply device employing a flexible structure central water pipe, characterized in that: The system includes a water inlet seat (30) and a rotary sealing assembly fixed on the end cover (32) of the rocker arm center gear set of the coal mining machine, a water outlet seat connected to the rocker arm output shaft (19), and a flexible central water pipe (29) connecting the rotary sealing assembly and the water outlet seat (31). The rotary sealing assembly includes a sealing seat (1) and a rotating sleeve (2) installed in the sealing seat (1) via a bearing (3) and a bushing (4). The water outlet seat includes an adjusting seat (31) connected to the rocker arm output shaft (19) and a water outlet seat disposed within the adjusting seat (31). The connector (37) is used to connect with the central water pipe (29). One end of the central water pipe (29) is inserted into the rotating sleeve (2), and the other end of the central water pipe (29) is inserted into the connector (37). The interior of the rotating sleeve (2) and the interior of the connector (37) are provided with keys (38) for key connection with the central water pipe (29). The adjusting seat (31) is provided with a plurality of set screws (39) for tensioning the central water pipe (29). The inner end of the set screw (39) is pressed against the rocker arm output shaft (19). The central water pipe (29) includes a flexible hose (29-1) and two pipe fittings (29-2) respectively located at both ends of the flexible hose (29-1). The pipe fittings (29-2) are connected to the flexible hose (29-1) through an outer sleeve (29-3). The rotating sleeve (2) is limited by a U-shaped clamp (40) between it and one of the pipe fittings (29-2), and between the fitting seat (37) and the other pipe fitting (29-2). A sealing ring (41) is provided between the adjusting seat (31) and the rocker arm output shaft (19), and between the adjusting seat (31) and the connector seat (37). The sealing seat (1) is provided with a first leakage hole (1-3). A spring support seat (8) is fitted on the outside of the rotating sleeve (2). The spring support seat (8) and the bearing (3) are located on the outside of both ends of the rotating sleeve (2). A plurality of corrugated springs (11) are provided on one end of the spring support seat (8). 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 fitted on the outside of the spring support seat (8). An inner retaining edge (12-1) is provided inside the dynamic seal mounting ring (12). The spring support seat (8) and the dynamic seal mounting ring (12-1) are connected. A second radial O-ring (17) is installed between the mounting rings (12). The corrugated spring (11) is supported between the spring support seat (8) and the inner flange (12-1). A dynamic sealing ring (13) is interference-fitted inside one end of the dynamic sealing mounting ring (12). A static sealing ring (14) is provided on one side of the dynamic sealing ring (13). An end face sealing pair is formed between the dynamic sealing ring (13) and the static sealing ring (14). The static sealing ring (14) is connected to the sealing seat (1) through two pins (15). A third radial O-ring (18) is installed between the static sealing ring (14) and the sealing seat (1).

2. The spray water supply device inside a coal mining machine with a flexible central water pipe as described in claim 1, characterized in that: The spring support base (8) has multiple spring mounting holes for installing the corrugated spring (11). The spring mounting holes are connected to one end of the spring support base (8). One end of the corrugated spring (11) is connected to the bottom of the spring mounting hole, and the other end of the corrugated spring (11) is pressed against the inner flange (12-1).

3. A coal mining machine internal spray water supply device with a flexible structure central water pipe as described in claim 1, characterized in that: The sealing seat (1) is provided with a connecting flange (1-1) for connecting with the end cover (32) of the center gear set of the coal mining machine rocker arm. The connecting flange (1-1) is provided with a plurality of screw mounting holes (1-2) evenly distributed along its circumference. The inner end of the first leakage hole (1-3) is located between the lip seal (5) and the bushing (4). The outer end of the first leakage hole (1-3) is connected to one end of the connecting flange (1-1). One end of the connecting flange (1-1) is provided with an end face O-ring (35). The outer end of the first leakage hole (1-3) is located inside the end face O-ring (35). The outer side of the sealing seat (1) is provided with two fourth radial O-rings (33). The two fourth radial O-rings (33) are respectively arranged on both sides of the connecting flange (1-1). The spring support seat (8) is connected to the rotating sleeve (2) by two stepped pins (9), and the outer side of the stepped pins (9) is radially limited by a second axial retaining ring (10).

4. A coal mining machine internal spray water supply device with a flexible structure central water pipe as described in claim 1, characterized in that: The pipe joint (29-2) is a steel joint. The pipe joint (29-2) is provided with a keyway (29-2-1) that matches the key (38). The pipe joint (29-2) is provided with two sealing ring mounting grooves (29-2-2) and a U-shaped card limiting groove (29-2-3).

5. A coal mining machine internal spray water supply device with a flexible structure central water pipe according to claim 1, characterized in that: The hose (29-1) includes a synthetic rubber inner layer (29-1-1), a synthetic rubber protective layer (29-1-2), and one or more steel wire braided reinforcing layers (29-1-3) disposed between the synthetic rubber inner layer (29-1-1) and the synthetic rubber protective layer (29-1-2). When the hose (29-1) includes multiple steel wire braided reinforcing layers (29-1-3), a rubber separation layer (29-1-4) is disposed between two adjacent steel wire braided reinforcing layers (29-1-3).

6. A coal mining machine internal spray water supply device with a flexible structure central water pipe according to claim 1, characterized in that: One end of the adjusting seat (31) is a flange (31-1) for connecting with the rocker arm output shaft (19), and the flange (31-1) and the rocker arm output shaft (19) are connected by a third screw (23); the exterior of the connector seat (37) is stepped, and the hole inside the adjusting seat (31) for installing the connector seat (37) is stepped.

7. A coal mining machine internal spray water supply device with a flexible structure central water pipe according to claim 1, characterized in that: Two U-shaped clip mounting holes (43) are provided at one end of the connector seat (37) and one end of the rotating sleeve (2). The other end of the connector seat (37) is threadedly connected to the elbow (25). A third shaft retaining ring (42) is provided on the connector seat (37). The third shaft retaining ring (42) is located on the adjusting seat (31) at the end away from the central water pipe (29).

8. A coal mining machine internal spray water supply device with a flexible structure central water pipe according to claim 7, characterized in that: It also includes a water inlet pipe (26), and a water inlet connector (24) is connected between the water inlet pipe (26) and the water inlet seat (30). The other end of the connector seat (37) is connected to the water outlet pipe (27) through an elbow (25). A hinge body (28) is connected to the water outlet pipe (27), and the hinge body (28) is installed on the spiral drum of the coal mining machine.

9. A coal mining machine internal spray water supply device with a flexible structure central water pipe according to claim 1, characterized in that: The water inlet seat (30) is provided with a second leakage hole (30-1) that is connected to the first leakage hole (1-3). A humidity sensor (20) is provided at the end of the second leakage hole (30-1) that is away from the first leakage hole (1-3).

Images