A cutting internal spraying system of a continuous miner

Abstract

The present application belongs to the technical field of cutting internal spraying device, and particularly relates to a cutting internal spraying system of continuous coal mining machine. The internal spraying system is arranged in a cutting device, and the cutting device comprises a cutting drum and a cutting reducer. The water outlet channels in the inner gear ring, bearing seat and side hub of the cutting reducer are sealingly connected. The water outlet channel of the inner gear ring is sealingly connected with the water inlet channel. The water outlet channels of the bearing seat and the side hub are connected by a water sealing assembly. A drum water distributor co-rotating with the side driving disc of the cutting reducer is installed on the side driving disc. The water inlet of the drum water distributor is connected with the water outlet channel of the side hub, and the water outlet is connected with the drum water channel of the cutting drum. The nozzles fixed on the surface of the cutting drum are communicated with the drum water channel. The safe and efficient operation of the internal spraying system is realized, the service life of the water sealing system is improved, the dust on the mining working face is effectively inhibited, the cutting teeth are cooled and the consumption of the cutting teeth is reduced, and the cutting spark is avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of internal spraying devices for cutting, and specifically relates to an internal spraying system for a continuous coal mining machine. Background Technology

[0002] Continuous mining machines are widely used in underground roadway excavation and in the mining of marginal coal, "three-level" coal, irregular blocks, and coal resources unsuitable for fully mechanized mining faces. The internal spraying device for cutting refers to the process where cooling water is atomized and sprayed directly around the cutting teeth through nozzles arranged on the rotating cutting drum via internal channels during continuous mining machine operation. This serves to suppress dust, cool the cutting teeth, reduce tooth wear, and prevent cutting sparks. The "Coal Mine Safety Regulations" stipulate that internal and external spraying devices should be used when mining equipment is operating underground in coal mines. The regulations also specify the system operating pressure for both internal and external spraying devices.

[0003] Currently, the research and development of internal spray systems for continuous coal mining machines in China is still in the experimental and development stage, and there are no mature products in practical application. A cutting internal spray device for a continuous coal mining machine, provided by patent number CN108691543B, has an internal spray water channel that does not pass through the inside of the reducer, avoiding emulsification of the gear oil inside the reducer caused by water seal failure, which could lead to transmission system failure. At the same time, placing the water seal outside the reducer allows for easy maintenance by simply disassembling the roller during replacement. However, the above-mentioned internal spray device has the following problems in actual use:

[0004] (1) The water seal has a large diameter and a high operating speed, which leads to rapid wear and consumption of the water seal and a short service life.

[0005] (2) The water seal is located between the drum and the reducer. Its centering accuracy is not high. In addition, the drum vibrates and impacts a lot when cutting coal. During use, the water seal is subjected to the irregular resistance of rotational friction and random vibration, which aggravates the wear and consumption of the water seal.

[0006] (3) Due to the friction of the large-diameter water seal, the friction pair in contact with the water seal is easily worn and damaged, has low reusability, and high maintenance cost.

[0007] (4) The internal spray device lacks real-time monitoring of its usage status and fault alarm. Summary of the Invention

[0008] The present invention aims to provide a safe internal spray system for continuous coal mining machines to improve the problems described in the background art; to achieve safe and efficient operation of the internal spray system, improve the service life of the system water seal, reduce maintenance costs, and ultimately achieve effective suppression of dust at the mining working face, as well as cooling of the drum cutting teeth and reducing tooth consumption, avoiding the generation of cutting sparks, and meeting the needs of efficient and rapid tunneling of the equipment.

[0009] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: an internal spray system for a continuous coal mining machine, wherein the internal spray system is arranged inside the cutting device, the cutting device including a cutting drum and a cutting reducer; the water inlet channel of the internal spray system is located inside the housing of the cutting reducer, and the water outlet channels in the internal gear ring, bearing seat and side hub of the cutting reducer are sealed together; the water outlet channel of the internal gear ring is sealed to the water inlet channel; the water outlet channels of the bearing seat and the side hub are connected by a water seal assembly, the water seal assembly being a dynamic sealing component between the moving and stationary components of the side hub and the bearing seat;

[0010] The cutting reducer has a drum water distributor that rotates with it on the side drive disc. The water inlet of the drum water distributor is connected to the water outlet channel of the side hub, and the water outlet is connected to the drum water channel of the cutting drum. The nozzles fixed on the surface of the cutting drum are connected to the drum water channel.

[0011] Furthermore, the water seal assembly includes a water seal, a water seal seat, and an end cap; the water seal assembly is fixedly connected to the side hub via a fixing pin, and the fixing pin is prevented from coming out by a retaining ring;

[0012] Two water seals are distributed one after the other in the inner ring of the water seal seat, forming an annular water channel in the middle. The inner hole of the water seal slides and seals with the bearing seat, and the water outlet channel of the bearing seat is located in the annular water channel. The end cap is fixedly connected to the water seal seat by screws to restrict the axial movement of the water seal.

[0013] The water passage hole on the water seal seat connects the annular water channel and the water outlet channel of the side hub; the outer ring of the water seal seat is provided with an O-ring and a groove for installing the seal before and after the water passage hole. The O-ring seals the joint gap between the water seal seat and the side hub.

[0014] Furthermore, the water seal is a seal with a built-in tilting spring.

[0015] Furthermore, the bearing housing slides in contact with the water seal through the outer ceramic sleeve, and the ceramic sleeve has a corresponding opening for the water outlet channel.

[0016] Furthermore, the internal spraying system consists of two independent subsystems, compatible with the left-right symmetrical structure of the cutting reducer and the cutting drum; the cutting drum includes a middle drum and side drums symmetrically arranged on both sides, and the internal spraying system delivers water from the side drums to the middle drum;

[0017] The cutting reducer has a water passage inside its main shaft. The inlet of the water passage is connected to the drum water distributor. The water passage is connected to the drum water channel of the intermediate drum through the connecting shaft. The connecting shaft, the main shaft and the intermediate drum rotate together.

[0018] Furthermore, one end of the connecting shaft is sealed to the main shaft, and the other end is sealed to the intermediate sleeve through a fixed sleeve. The intermediate sleeve is fixedly connected to the intermediate roller, and the fixed sleeve is fixedly connected to the intermediate sleeve through screws. The joints of the intermediate sleeve, the fixed sleeve, the connecting shaft, and the main shaft are statically sealed by O-rings.

[0019] Furthermore, a liquid-passing sleeve is inserted into the water outlet channel at the joint between the internal gear ring and the housing, and at the joint between the internal gear ring and the bearing housing.

[0020] Furthermore, multiple water outlet channels are provided inside the side hub, and these channels are connected to the outlet of the liquid distribution connector I inside the side hub. The inlet of the liquid distribution connector I is connected to the water passage hole of the water seal assembly.

[0021] Furthermore, multiple water outlet channels are provided inside the intermediate drum, and these channels are connected to the outlet of the liquid separator II inside the intermediate drum. The inlet of the liquid separator II is connected to the outlet of the connecting shaft.

[0022] Furthermore, the cutting device is equipped with an internal spray system monitoring and fault alarm system, which includes a gear pump, an oil monitoring system, and a data display alarm system. By monitoring the moisture content and non-metallic particles in the gear oil inside the cutting reducer in real time and comparing them with the system's set threshold, the system can provide early warning and protection for the internal spray system's operating status.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] In this invention, cooling spray water enters from the left and right housings of the cutting reducer, passes symmetrically through the left and right side water seal assemblies inside the cutting reducer, and then flows into the drum water distributor through multiple water outlet channels on the side hub. The cooling water in the drum water distributor enters the side drum through corresponding pipeline assemblies and enters the middle drum through the main shaft. The cooling spray water enters through a single channel and flows out through multiple channels, which can significantly reduce the pressure of the cooling spray water on the water seal.

[0025] In this invention, the internal spray system consists of two independent subsystems, compatible with the symmetrical structure of the cutting reducer and cutting drum. They can be independently controlled according to different process requirements for cutting and slotting underground. Specifically, during cutting, only one side of the drum's spray system operates; during slotting, both sides of the drum's spray system operate simultaneously. This reduces the softening effect of stagnant water on the roadway floor caused by the non-working side spray water, and also reduces energy loss from the non-working water seal, extending its service life and achieving energy conservation and consumption reduction.

[0026] In this invention, the water seal assembly is placed between the side hub and the fixed bearing seat. If the water seal fails, the entire water seal assembly can be removed simply by removing the side drum end plate, drum water distributor, pipeline assembly, and the side cover, side drive disc, and bearing cover of the cutting reducer. This eliminates the need for disassembling and reassembling the entire reducer or drum. This design facilitates easy disassembly and maintenance underground, significantly reducing the labor intensity of underground workers and improving work efficiency.

[0027] In this invention, the water seal assembly is located between the side hub and the fixed bearing seat. The side hub and the fixed bearing seat are supported by the bearing, resulting in high centering accuracy. During use, the side hub drives the water seal assembly to rotate around the bearing seat. The water seal is only subject to the rotational frictional resistance of the contact surface and is not affected by the external roller cutting load, thus ensuring stable operation under load. At the same time, the diameter of the water seal and the corresponding linear velocity are greatly reduced, resulting in less wear and high reliability.

[0028] In this invention, the built-in tilting spring in the water seal provides a continuous and constant sealing force to the sealing contact surface, unlike traditional combined seals such as rotating Glyd ring seals. This eliminates tilting wear and provides strong adaptability to pressure changes. The sealing seat is made of copper alloy, which provides both rust prevention and protection against scratches and wear on the ceramic contact surface. A certain gap is maintained between the sealing seat and the ceramic surface, allowing the cooling water to exert a capillary effect on the inner sides of the water seals, mitigating the pressure impact of the cooling water. Simultaneously, the outer side of the water seal is immersed in the reducer oil, which ensures pressure balance on both sides of the water seal and provides lubrication, further guaranteeing the reliability and service life of the water seal.

[0029] In this invention, a ceramic sleeve is installed on the bearing housing. Treated using ceramic cladding technology, the surface hardness reaches 55-60 HRC, providing high surface wear resistance and rust prevention. This, combined with the frictional operation of the water seal, reduces sealing friction resistance and extends the seal's service life. Furthermore, the ceramic sleeve has an opening groove for easy replacement without affecting the bearing housing, allowing for reuse and saving maintenance costs.

[0030] In this invention, an intelligent failure monitoring and early warning system for the internal spray system is provided. By real-time monitoring of moisture and non-metallic particles in the gear oil inside the cutting reducer and comparing them with the system's set threshold, the system provides early warning and protection for the internal spray system's operating status, thereby preventing water seal failure and cooling water leakage into the cutting reducer, which could cause transmission system failure. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of the cutting device;

[0032] Figure 2 This is a diagram showing the distribution of the internal spray system within the cutting device.

[0033] Figure 3 This diagram shows the distribution of the internal spray system subsystem within the cutting device.

[0034] Figure 4 This is a schematic diagram of the connecting shaft installation;

[0035] Figure 5 This is a schematic diagram showing the routing of the water outlet channel in the internal gear ring, bearing housing, and side hub.

[0036] Figure 6 This is a schematic diagram of the water seal assembly.

[0037] Figure 7 This is a sectional view of the shell;

[0038] Figure 8 This is a schematic diagram of the internal spray system monitoring and fault alarm system;

[0039] In the diagram: 1. Cutting reducer; 2. Cutting drum; 3. Internal spray system; 1.1. Housing; 1.1-1. Water inlet channel; 1.1-2. Oil outlet channel; 1.1-3. Oil return channel; 1.2. Internal gear ring; 1.3. Bearing housing; 1.4. Left bearing; 1.5. Side hub; 1.6. Right bearing; 1.7. Main shaft; 1.8. Side drive disc; 1.9. Intermediate sleeve; 1.10. Left hub; 2.1. Side drum; 2.2. Intermediate drum; 2.3. Nozzle cover; 2.4. Nozzle; 2.5. 3.1. Piping assembly; 3.2. Drum water distributor; 3.3. Support block; 3.4. Fixing pin; 3.5. Ceramic sleeve; 3.6. Liquid distributor I; 3.7. Water seal assembly; 3.7-1. Water seal; 3.7-2. Sealing seat; 3.7-3. Screw; 3.7-4. End cap; 3.8. Liquid passage sleeve; 3.9. Liquid distributor II; 3.10. Fixing sleeve; 3.11. Connecting shaft; 4.1. Gear pump; 4.2. Oil monitoring system; 4.3. Data display and alarm system. Detailed Implementation

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] like Figure 1 As shown: A cutting internal spray system for a continuous coal mining machine, the internal spray system is arranged inside the cutting device, the cutting device includes a cutting drum and a cutting reducer.

[0042] like Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown: The water inlet channel 1.1-1 of the internal spray system is located inside the housing 1.1 of the cutting reducer. The water outlet channels in the internal gear ring 1.2, bearing housing 1.3, and side hub 1.5 of the cutting reducer are sealed together. The water outlet channel of the internal gear ring 1.2 is sealed to the water inlet channel 1.1-1. The water outlet channels of the bearing housing 1.3 and the side hub 1.5 are connected by a water seal assembly 3.7, which is a dynamic sealing component between the moving and stationary components of the side hub 1.5 and the bearing housing 1.3. The bearing housing 1.3 and the side hub 1.5 are supported and positioned by the left bearing 1.4 and the right bearing 1.6. A drum water distributor 3.2 that rotates with the cutting reducer is installed on the side drive disc 1.8. The water inlet of the drum water distributor 3.2 is connected to the water outlet channel of the side hub 1.5, and the water outlet is connected to the drum water channel 2.5 of the cutting drum. The nozzle 2.4 fixed on the surface of the cutting drum is connected to the drum water channel 2.5.

[0043] like Figure 5 , Figure 6 As shown: The water seal assembly 3.7 includes a water seal 3.7.1, a water seal seat 3.7.2, and an end cap 3.7.4; the water seal assembly 3.7 is fixedly connected to the side hub 1.5 by a fixing pin 3.4 to prevent the water seal assembly 3.7 from slipping or shifting to the side relative to the bearing seat 1.3, and the fixing pin 3.4 is prevented from coming off by a retaining ring.

[0044] Two water seals 3.7.1 are positioned one after the other within the inner ring of the water seal seat 3.7.2, forming an annular water channel in the middle. The inner hole of the water seal 3.7.1 slides and seals with the bearing housing 1.3. The water outlet channel of the bearing housing 1.3 is located in the annular water channel, which is always in communication with the water outlet channel of the bearing housing 1.3. The water outlet channels of the bearing housing 1.3 and the side hub 1.5 remain connected when they rotate relative to each other. The end cap 3.7.4 is fixedly connected to the water seal seat 3.7.2 by screws 3.7.3, restricting the axial movement of the water seal 3.7.1.

[0045] The water passage hole on the water seal seat 3.7.2 connects the annular water channel and the water outlet channel of the side hub 1.5; the outer ring of the water seal seat 3.7.2 is provided with O-rings and grooves for installing the seals before and after the water passage hole. The O-rings seal the joint gap between the water seal seat 3.7.2 and the side hub 1.5, which can prevent cooling water from leaking along the joint surface between the water seal seat 3.7.2 and the side hub 1.5.

[0046] Water seal 3.7.1 is a seal with a built-in tilting spring, which can adapt to tilting wear and has the characteristics of being more adaptable to pressure changes, and can provide a continuous and constant sealing force to the sealing contact surface.

[0047] The water seal seat 3.7.2 is made of copper alloy, which provides rust prevention and avoids scratches and wear on the sealing contact surface. A certain gap is maintained between the inner ring of the water seal seat 3.7.2 and the bearing housing 1.3, allowing the cooling water to exert a capillary effect on the inner sides of the two water seals 3.7.1, thus mitigating the pressure impact of the cooling water. A certain gap is also maintained between the inner hole of the end cap 3.7.4 and the bearing housing 1.3, placing the outer side of the water seal 3.7.1 in the reducer oil. The oil ensures that the inner and outer sides of the water seal 3.7.1 are in a pressure-balanced state, and also lubricates the outer lip of the water seal 3.7.1, further ensuring the reliability and service life of the water seal 3.7.1.

[0048] The bearing housing 1.3 slides in contact with the water seal 3.7.1 via an outer ceramic sleeve 3.5. The ceramic sleeve 3.5 has an opening corresponding to the water outlet channel. The surface of the ceramic sleeve 3.5 is clad with ceramic, achieving a surface hardness of 55-60 HRC, providing high surface wear resistance and rust prevention. This ceramic sleeve, in friction contact with the water seal 3.7.1, reduces sealing friction resistance and extends seal life. Furthermore, the ceramic sleeve 3.5 has an opening groove for easy replacement without affecting the bearing housing 1.3, allowing for reuse and saving maintenance costs.

[0049] like Figure 2 As shown: The internal spraying system consists of two independent subsystems, compatible with the symmetrical structure of the cutting reducer and cutting drum. The cutting drum includes a central drum 2.2 and two symmetrically arranged side drums 2.1. The internal spraying system supplies water from the side drums 2.1 to the central drum 2.2. Depending on the different process requirements of cutting and slotting in the mine, the spraying systems can be controlled independently. Specifically, during cutting, only one side of the drum's spraying system operates; during slotting, both sides of the drum's spraying system operate simultaneously. This reduces the softening effect of stagnant water on the roadway floor caused by the non-working side spraying water, reduces energy loss from the non-working water seal, extends service life, and achieves energy conservation and consumption reduction.

[0050] The main shaft 1.7 of the cutting reducer is equipped with a water passage. The inlet of the water passage is connected to the drum water distributor 3.2. The water passage is connected to the drum water channel of the intermediate drum 2.2 through the connecting shaft 3.11. The connecting shaft 3.11, the main shaft 1.7, and the intermediate drum 2.2 rotate together. The cooling water in the drum water distributor 3.2 enters the side drum 2.1 through the pipeline assembly 3.1, and enters the intermediate drum 2.2 through the main shaft 1.7 and the connecting shaft 3.11.

[0051] The side roller 2.1 and the intermediate roller 2.2 include multiple sets of water channels built into the inside of the roller, a nozzle cover 2.3 welded and fixed to the surface of the roller, and a nozzle 2.4 installed in the cover; cooling water enters the corresponding nozzle after passing through the roller water channels and is atomized and sprayed out, thereby cooling the corresponding cutting teeth and suppressing the generation of cutting sparks.

[0052] One end of the connecting shaft 3.11 is sealed to the main shaft 1.7, and the other end is sealed to the intermediate sleeve 1.9 through the fixing sleeve 3.10. The intermediate sleeve 1.9 is fixedly connected to the intermediate roller 2.2, and the fixing sleeve 3.10 is fixedly connected to the intermediate sleeve 1.9 by screws. The joints of the intermediate sleeve 1.9, the fixing sleeve 3.10, the connecting shaft 3.11 and the main shaft 1.7 are sealed at relative static conditions by O-rings.

[0053] The connecting shaft 3.11 is made of spring steel and has a certain elastic deformation, which can compensate for the alignment and assembly error between the connecting shaft 3.11 and the intermediate sleeve 1.9, and meet the spline transmission error between the main shaft 1.7 and the intermediate ring.

[0054] A liquid-passing sleeve 3.8 is inserted into the water outlet channel at the joint between the internal gear ring 1.2 and the housing 1.1, and at the joint between the internal gear ring 1.2 and the bearing seat 1.3.

[0055] Multiple water outlet channels are provided inside the side hub 1.5, and these channels connect to the outlets of the liquid distribution connector I3.6 within the side hub 1.5. The inlets of the liquid distribution connector I3.6 connect to the water passage holes of the water seal assembly 3.7. Multiple water outlet channels are provided inside the intermediate roller 2.2, and these channels connect to the outlets of the liquid distribution connector II3.9 within the intermediate roller 2.2. The inlets of the liquid distribution connector II3.9 connect to the outlet of the connecting shaft 3.11. Cooling spray water enters from the reducer housing water inlet channel 1.1-1, passes through the liquid sleeve 3.8, the internal gear ring 1.2, and the bearing seat 1.4 before entering the water seal assembly 3.7. It then enters the side hub 1.5 through the liquid distribution connector I3.6. Multiple water outlet channels are provided on the side hub 1.5, and the cooling spray water finally converges and enters the roller water distributor 3.2. The roller water distributor 3.2 is fixedly connected to the side drive disc 1.8 via the support block 3.3, and they rotate together. This design allows the cooling spray water to enter through a single channel in the casing and then flow out through a multi-channel diversion system via the side hub 1.5, which significantly reduces the pressure of the cooling spray water flowing through the water seal.

[0056] like Figure 8 As shown: The cutting device is equipped with an internal spray system monitoring and fault alarm system, which includes a gear pump 4.1, an oil monitoring system 4.2, and a data display alarm system 4.3. By real-time monitoring of moisture and non-metallic particles in the gear oil inside the cutting reducer and comparing them with the system's set threshold, the system can provide early warning and protection for the internal spray system's operating status.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cutting internal spray system for a continuous coal mining machine, wherein the internal spray system is arranged inside the cutting device, and the cutting device includes a cutting drum and a cutting reducer; Its features are: The water inlet channel (1.1-1) of the internal spray system is located inside the housing (1.1) of the cutting reducer. The water outlet channels in the internal gear ring (1.2), bearing housing (1.3) and side hub (1.5) of the cutting reducer are sealed together. The water outlet channel of the internal gear ring (1.2) is sealed to the water inlet channel (1.1-1). The water outlet channels of the bearing housing (1.3) and the side hub (1.5) are connected by a water seal assembly (3.7). The water seal assembly (3.7) is a dynamic sealing component between the moving and static components of the side hub (1.5) and the bearing housing (1.3). A drum water distributor (3.2) that rotates together with the side drive disc (1.8) of the cutting reducer is installed. The water inlet of the drum water distributor (3.2) is connected to the water outlet channel of the side hub (1.5), and the water outlet is connected to the drum water channel (2.5) of the cutting drum. The nozzle (2.4) fixed on the surface of the cutting drum is connected to the drum water channel (2.5). The water seal assembly (3.7) includes a water seal (3.7.1), a water seal seat (3.7.2), and an end cap (3.7.4); the water seal assembly (3.7) is fixedly connected to the side hub (1.5) by a fixing pin (3.4), and the fixing pin (3.4) is prevented from coming off by a retaining ring; Two water seals (3.7.1) are distributed one after the other in the inner ring of the water seal seat (3.7.2), forming an annular water channel in the middle. The inner hole of the water seal (3.7.1) slides and seals with the bearing seat (1.3). The water outlet channel of the bearing seat (1.3) is located in the annular water channel. The end cap (3.7.4) is fixedly connected to the water seal seat (3.7.2) by screws (3.7.3) to restrict the axial movement of the water seal (3.7.1). The water passage hole on the water seal seat (3.7.2) connects the annular water channel and the water outlet channel of the side hub (1.5); the outer ring of the water seal seat (3.7.2) is provided with an O-ring and a groove for installing the seal before and after the water passage hole. The O-ring seals the joint gap between the water seal seat (3.7.2) and the side hub (1.5).

2. The internal spraying system for cutting in a continuous coal mining machine according to claim 1, characterized in that: The water seal (3.7.1) is a seal with a built-in tilting spring.

3. The internal spraying system for cutting in a continuous coal mining machine according to claim 1, characterized in that: The bearing housing (1.3) is in sliding contact with the water seal (3.7.1) through the outer ceramic sleeve (3.5), and the ceramic sleeve (3.5) has a corresponding water outlet opening.

4. The internal spraying system for cutting in a continuous coal mining machine according to claim 1, characterized in that: The internal spraying system consists of two independent subsystems, compatible with the left-right symmetrical structure of the cutting reducer and the cutting drum; the cutting drum includes a middle drum (2.2) and side drums (2.1) symmetrically arranged on both sides, and the internal spraying system delivers water from the side drums (2.1) to the middle drum (2.2); The main shaft (1.7) of the cutting reducer is equipped with a water passage. The inlet of the water passage is connected to the drum water distributor (3.2). The water passage is connected to the drum water channel of the intermediate drum (2.2) through the connecting shaft (3.11). The connecting shaft (3.11), the main shaft (1.7) and the intermediate drum (2.2) rotate together.

5. The internal spraying system for cutting in a continuous coal mining machine according to claim 4, characterized in that: One end of the connecting shaft (3.11) is sealed to the main shaft (1.7), and the other end is sealed to the intermediate sleeve (1.9) through the fixing sleeve (3.10). The intermediate sleeve (1.9) is fixedly connected to the intermediate roller (2.2), and the fixing sleeve (3.10) is fixedly connected to the intermediate sleeve (1.9) by screws. The joints of the intermediate sleeve (1.9), the fixing sleeve (3.10), the connecting shaft (3.11), and the main shaft (1.7) are statically sealed by O-rings.

6. The internal spraying system for cutting in a continuous coal mining machine according to claim 1, characterized in that: A liquid-passing sleeve (3.8) is inserted into the water outlet channel at the joint between the internal gear ring (1.2) and the housing (1.1) and at the joint between the internal gear ring (1.2) and the bearing seat (1.3).

7. The internal spraying system for cutting in a continuous coal mining machine according to claim 1, characterized in that: The side hub (1.5) is provided with multiple water outlet channels, which are connected to the outlet of the liquid distribution connector I (3.6) in the side hub (1.5), and the inlet of the liquid distribution connector I (3.6) is connected to the water passage hole of the water seal assembly (3.7).

8. The internal spraying system for cutting in a continuous coal mining machine according to claim 4, characterized in that: The intermediate roller (2.2) is provided with multiple water outlet channels, which are connected to the outlet of the liquid separator II (3.9) in the intermediate roller (2.2). The inlet of the liquid separator II (3.9) is connected to the outlet of the connecting shaft (3.11).

9. The internal spraying system for cutting in a continuous coal mining machine according to claim 1, characterized in that: The cutting device is equipped with an internal spray system monitoring and fault alarm system, which includes a gear pump (4.1), an oil monitoring system (4.2), and a data display alarm system (4.3). By real-time monitoring of moisture and non-metallic particles in the gear oil inside the cutting reducer and comparing them with the system's set threshold, the device can provide early warning and protection for the internal spray system's operating status.

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