Annular water jacket and internal spray system for roadheader

Abstract

A ring water jacket for a roadheader. The ring water jacket is axially penetrated with a main shaft mounting hole, and radially penetrated with an internal spray water inlet channel. The internal spray water inlet channel is used to conduct the internal spray water from the outside of the ring water jacket to the inside of the main shaft. Inside the ring water jacket, two circumferentially spaced ring water cavities are provided along the circumference, namely a first ring water cavity and a second ring water cavity. A communication hole is provided inside the ring water jacket to connect the first ring water cavity and the second ring water cavity. The ring water jacket is radially provided with a cooling water inlet channel, and the cooling water inlet channel is connected to the first ring water cavity to conduct the cooling water from the outside of the ring water jacket into the first ring water cavity. The ring water jacket is radially provided with a cooling water outlet channel, and the cooling water outlet channel is connected to the second ring water cavity to discharge the cooling water from the second ring water cavity to the outside of the ring water jacket. The present invention also provides an internal spray system for a roadheader having the ring water jacket.

Description

Technical Field

[0001] The present invention relates to the technical field of tunneling equipment, and specifically relates to an annular water jacket and an internal spray system used for the cantilever section of a roadheader. Background Art

[0002] A roadheader is an engineering equipment used for tunneling in mine shafts and tunnels. This equipment uses a cutting head to cut rocks and soil, then transports the waste through a conveyor, and finally transfers the waste out. The cutting part of the roadheader mainly consists of a cutting head and a cantilever section. During the cutting process, internal spray water is required to moisten the cutting area, thereby eliminating sparks and breaking dust, which plays a great role in ensuring safety in use and protecting the health of workers.

[0003] Generally, the internal spray water is connected to a water pipe from the outer cylinder of the cantilever section, conducts through a water channel through the main shaft, reaches the cutting head, and sprays out from the water spray seat on the cutting head. Since the main shaft and the cutting head are in rotational motion, while the outer cylinder of the cantilever is stationary, a water jacket device is required when the water conducts from the outer cylinder of the cantilever into the main shaft to ensure that the water does not leak during the conduction process.

[0004] Figure 1 and Figure 2 FIG. 16 is a schematic structural diagram of a traditional internal spray system for a roadheader. The outermost layer of the annular water jacket 70 is a jacket 71, the jacket 71 is connected to a water inlet pipe 80, and a water inlet 81 communicating with the water inlet pipe 80 is provided on the outer cylinder 60 of the cantilever. The jacket 71 is fixed to the outer cylinder 60 of the cantilever using a positioning pin, so that the jacket 71 and the outer cylinder 60 of the cantilever remain stationary. The inner sleeve 72 of the annular water jacket 70 is fixedly connected to the main shaft 50 using a flat key 73, so that the inner sleeve 72 rotates with the main shaft 50. Then, a retaining ring 74 is used to hold the flat key 73 to prevent the flat key 73 from falling off. A bearing 75 is used between the inner sleeve 72 and the jacket 71 to enable the inner sleeve 72 to rotate relative to the jacket 71. The bearing 75 is pressed by an end cover 76 on the outside. A skeleton oil seal 77 is required on the outside of the bearing 75 to block the outflow of lubricating oil, and a rotary water seal 78 is required on the inside of the bearing 75 to block the mixing of internal spray water and lubricating oil. The remaining relatively stationary parts are all sealed with an O-ring 79 to prevent water leakage.

[0005] However, the structure of the traditional annular water jacket is relatively complex, difficult to process and maintain, and the cost is too high. When the rotary water seal is damaged, water will enter the bearing, causing the bearing to be damaged, and thus the entire system cannot work. Since the rotary water seal is a sliding friction, a large amount of heat will be generated, resulting in rapid wear of the material, reducing the service life of the rotary water seal, and water leakage will occur after the inner sleeve is worn. Summary of the Invention

[0006] The object of the present invention is to provide an annular water jacket and an internal spray system for a roadheader. The annular water jacket itself has a cooling system, and the entire annular water jacket can be cooled by cooling water flowing through two annular water cavities of the annular water jacket, thereby at least partially solving the above technical problems.

[0007] The present invention provides an annular water jacket for a roadheader. The annular water jacket is axially penetrated with a main shaft mounting hole, and is radially penetrated with an internal spray water inlet channel for conducting internal spray water from the outside of the annular water jacket to the inside of the main shaft. Inside the annular water jacket, two mutually separated annular water cavities are circumferentially arranged, namely a first annular water cavity and a second annular water cavity. A communication hole for communicating the first annular water cavity with the second annular water cavity is arranged inside the annular water jacket. The annular water jacket is radially provided with a cooling water inlet channel communicating with the first annular water cavity for conducting cooling water from the outside of the annular water jacket into the first annular water cavity. The annular water jacket is radially provided with a cooling water outlet channel communicating with the second annular water cavity for discharging the cooling water from the second annular water cavity to the outside of the annular water jacket.

[0008] Further, axially along the annular water jacket, the first annular water cavity and the second annular water cavity are respectively located on both sides of the internal spray water inlet channel.

[0009] Further, axially along the annular water jacket, on the inner circumferential surface of the annular water jacket, a plurality of first annular sealing grooves are arranged at intervals on both sides of the internal spray water inlet channel, and each first annular sealing groove is used for installing a first annular sealing ring.

[0010] Further, axially along the annular water jacket, on the outer circumferential surface of the annular water jacket, a second annular sealing groove is arranged on both sides of the cooling water inlet channel, and each second annular sealing groove is used for installing a second annular sealing ring; axially along the annular water jacket, on the outer circumferential surface of the annular water jacket, a third annular sealing groove is arranged on both sides of the cooling water outlet channel, and each third annular sealing groove is used for installing a third annular sealing ring.

[0011] Further, on the outer circumferential surface of the annular water jacket, a first annular groove is recessed at the top position corresponding to the internal spray water inlet channel, and on the inner circumferential surface of the annular water jacket, a second annular groove is recessed at the bottom position corresponding to the internal spray water inlet channel. The first annular groove is communicated with the second annular groove through the internal spray water inlet channel.

[0012] Further, on the outer circumferential surface of the annular water jacket, a third annular groove is recessed at the top position corresponding to the cooling water inlet channel, and the third annular groove is communicated with the cooling water inlet channel; on the outer circumferential surface of the annular water jacket, a fourth annular groove is recessed at the top position corresponding to the cooling water outlet channel, and the fourth annular groove is communicated with the cooling water outlet channel.

[0013] The present invention further provides an internal spray system for a roadheader, including the above-mentioned annular water jacket for a roadheader.

[0014] Furthermore, the internal spray system further includes a main shaft and a cantilever outer cylinder. The annular water jacket is sleeved on the main shaft through a main shaft mounting hole. An assembly hole is axially provided inside the cantilever outer cylinder. The annular water jacket and the main shaft are assembled in the assembly hole of the cantilever outer cylinder. The annular water jacket is located between the main shaft and the cantilever outer cylinder, wherein the annular water jacket is fixed on the cantilever outer cylinder and is stationary with the cantilever outer cylinder, and the main shaft can rotate inside the annular water jacket.

[0015] Furthermore, the cantilever outer cylinder is provided with an internal spray water inlet and an internal spray water channel. The internal spray water channel connects the internal spray water inlet with the internal spray water passage; the cantilever outer cylinder is provided with a cooling water inlet and a cooling water channel. The cooling water channel connects the cooling water inlet with the cooling water passage; the cantilever outer cylinder is provided with a cooling water outlet and a cooling water channel. The cooling water channel connects the cooling water passage with the cooling water outlet; an internal spray water flow passage is axially provided inside the main shaft, and an internal spray water inlet flow passage is radially provided inside the main shaft. The internal spray water inlet flow passage connects the internal spray water passage with the internal spray water flow passage, and the internal spray water channel, the cooling water channel and the cooling water channel do not communicate with each other.

[0016] Furthermore, the number of internal spray water passages is four, and every two adjacent internal spray water passages are arranged at an interval of 90 degrees in the circumferential direction of the annular water jacket; the number of internal spray water inlet flow passages is two, and the two internal spray water passages are arranged at an interval of 180 degrees in the circumferential direction of the main shaft.

[0017] The annular water jacket and the internal spray system for a roadheader provided by the embodiments of the present invention have a simple structure, reliable functions, convenient processing and maintenance, and low costs. The annular water jacket itself has a cooling system, and the entire annular water jacket can be cooled by cooling water flowing through the two annular water cavities of the annular water jacket, so that the annular water jacket will not have too high a temperature, thereby reducing the service life of the annular water jacket and the Grease Seal Ring. Furthermore, the internal spray system has multiple rotating seal points between the main shaft and the annular water jacket. This frame structure can replace and use another rotating seal point after one rotating seal point is worn, thereby reducing the maintenance times of the main shaft and increasing the service life.

[0018] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the drawings, details are described. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a traditional internal spray system for a roadheader.

[0020] Figure 2 is Figure 1 An enlarged schematic view of the annular water jacket and the main shaft in

[0021] Figure 3 is a schematic structural view of the internal spray system for a roadheader in an embodiment of the present invention (corresponding to Figure 4 a schematic cross-sectional view along line B-B in

[0022] Figure 4 is Figure 3 a schematic cross-sectional view along line A-A in

[0023] Figure 5 is Figure 4 a schematic cross-sectional view along line C-C in

[0024] Figure 6 is Figure 4 a schematic cross-sectional view along line D-D in

[0025] Figure 7 is Figure 3 An enlarged schematic view of the annular water jacket and the main shaft in Detailed implementation manners

[0026] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects proposed according to the present invention as follows:

[0027] The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Through the description of the specific implementation manners, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and illustration, and are not used to limit the present invention.

[0028] As Figures 3 to 7 shown, an internal spray system for a roadheader is provided in an embodiment of the present invention, including a main shaft 10, a cantilever outer cylinder 20 and an annular water jacket 30. The annular water jacket 30 is axially provided with a main shaft mounting hole 30a, and the annular water jacket 30 is sleeved on the main shaft 10 through the main shaft mounting hole 30a. An assembly hole 21 is axially provided in the cantilever outer cylinder 20, and the annular water jacket 30 and the main shaft 10 are assembled in the assembly hole 21 of the cantilever outer cylinder 20. The annular water jacket 30 is located between the main shaft 10 and the cantilever outer cylinder 20, wherein the annular water jacket 30 is fixed on the cantilever outer cylinder 20 and is stationary with the cantilever outer cylinder 20, and the main shaft 10 can rotate within the annular water jacket 30. In this embodiment, a positioning pin 40 is passed through the cantilever outer cylinder 20 and fixed to the annular water jacket 30 to fix the annular water jacket 30 and the cantilever outer cylinder 20 together and keep the two stationary.

[0029] The annular water jacket 30 is provided with an internal spray water inlet channel 31 penetrating radially, and the internal spray water inlet channel 31 is used to conduct the internal spray water from the outside of the annular water jacket 30 to the inside of the main shaft 10.

[0030] Two annular water chambers separated from each other are provided circumferentially inside the annular water jacket 30, namely a first annular water chamber 32 and a second annular water chamber 33. A communication hole 34 is provided inside the annular water jacket 30 to communicate the first annular water chamber 32 with the second annular water chamber 33, so that the cooling water can flow from the first annular water chamber 32 to the second annular water chamber 33 through the communication hole 34.

[0031] The annular water jacket 30 is provided with a cooling water inlet channel 35 radially, and the cooling water inlet channel 35 is communicated with the first annular water chamber 32 to conduct the cooling water from the outside of the annular water jacket 30 into the first annular water chamber 32.

[0032] The annular water jacket 30 is provided with a cooling water outlet channel 36 radially, and the cooling water outlet channel 36 is communicated with the second annular water chamber 33 to discharge the cooling water from the second annular water chamber 33 to the outside of the annular water jacket 30.

[0033] Among them, the internal spray water inlet channel 31 is not communicated with any one of the cooling water inlet channel 35 and the cooling water outlet channel 36.

[0034] In this embodiment, the number of the communication holes 34 is two, which are arranged on the lower side of the annular water jacket 30 to communicate the two annular water chambers 32 and 33, but it is not limited thereto, and the number of the communication holes 34 can be adjusted according to the actual situation.

[0035] Specifically, axially along the annular water jacket 30, the first annular water chamber 32 and the second annular water chamber 33 are respectively located on both sides of the internal spray water inlet channel 31. In this embodiment, the internal spray water inlet channel 31 is arranged at the middle position of the axial length dimension of the annular water jacket 30, and the two annular water chambers 32 and 33 are symmetrically arranged on both sides of the internal spray water inlet channel 31.

[0036] Specifically, along the axial direction of the annular water jacket 30, on the inner peripheral surface of the annular water jacket 30, a plurality of first annular sealing grooves 37 are provided at both sides of the inner spray water inlet channel 31 at intervals. Each first annular sealing groove 37 is used for installing a first annular sealing ring 41. The first annular sealing ring 41 can be an O-ring, for example, a rotating Gland ring produced by German company Technoseal can be used. By providing a plurality of first annular sealing grooves 37 at the relative movement position of the inner peripheral surface of the annular water jacket 30 with respect to the main shaft 10 and installing a first annular sealing ring 41 in one first annular sealing groove 37 selected on each side of the inner spray water inlet channel 31, the main shaft 10 is kept water-sealed during rotation. By providing a plurality of first annular sealing grooves 37 on either side of the inner spray water inlet channel 31 on the inner peripheral surface of the annular water jacket 30, a plurality of rotating sealing points can be formed, and one rotating sealing point is used on each side each time. When a rotating sealing point is worn out during use, other rotating sealing points can be replaced for continuous use, thereby reducing the maintenance times of the main shaft 10 and increasing its service life.

[0037] Specifically, along the axial direction of the annular water jacket 30, on the outer peripheral surface of the annular water jacket 30, a second annular sealing groove 38 is provided on each side of the cooling water inlet channel 35, and each second annular sealing groove 38 is used for installing a second annular sealing ring 42; along the axial direction of the annular water jacket 30, on the outer peripheral surface of the annular water jacket 30, a third annular sealing groove 39 is provided on each side of the cooling water outlet channel 36, and each third annular sealing groove 39 is used for installing a third annular sealing ring 43. The second annular sealing ring 42 and the third annular sealing ring 43 can be O-rings. By using two second annular sealing rings 42 on the outer peripheral surface of the annular water jacket 30 to seal the incoming cooling water, using two third annular sealing rings 43 to seal the outgoing cooling water, and using one second annular sealing ring 42 and one third annular sealing ring 43 located on both sides of the inner spray water inlet channel 31 to seal the incoming inner spray water, the cross-flow of water with different water pressures is prevented, and the problem of leakage is also avoided.

[0038] Specifically, at the top position corresponding to the inner spray water inlet channel 31 on the outer peripheral surface of the annular water jacket 30, a first annular groove 311 is recessed, and at the bottom position corresponding to the inner spray water inlet channel 31 on the inner peripheral surface of the annular water jacket 30, a second annular groove 312 is recessed. The first annular groove 311 and the second annular groove 312 are communicated through the inner spray water inlet channel 31.

[0039] Specifically, at the top position corresponding to the cooling water inlet channel 35 on the outer peripheral surface of the annular water jacket 30, a third annular groove 351 is recessed, and the third annular groove 351 is communicated with the cooling water inlet channel 35; at the top position corresponding to the cooling water outlet channel 36 on the outer peripheral surface of the annular water jacket 30, a fourth annular groove 361 is recessed, and the fourth annular groove 361 is communicated with the cooling water outlet channel 36.

[0040] Specifically, the number of any one of the internal spray water inlet channels 31, the cooling water inlet channels 35, and the cooling water outlet channels 36 is preferably plural. For example, taking the internal spray water inlet channel 31 as an example, in this embodiment, the number thereof is four, and the circumferential direction of the annular water jacket 30 is provided with a 90-degree interval between every two adjacent internal spray water inlet channels 31, as Figure 4 shown.

[0041] Specifically, the cantilever outer cylinder 20 is provided with an internal spray water inlet 22 and an internal spray water inlet channel 23, and the internal spray water inlet channel 23 communicates the internal spray water inlet 22 with the internal spray water inlet channel 31; the cantilever outer cylinder 20 is provided with a cooling water inlet 24 and a cooling water inlet channel 25, and the cooling water inlet channel 25 communicates the cooling water inlet 24 with the cooling water inlet channel 35; the cantilever outer cylinder 20 is provided with a cooling water outlet 26 and a cooling water outlet channel 27, and the cooling water outlet channel 27 communicates the cooling water outlet channel 36 with the cooling water outlet 26; an internal spray water outlet flow channel 11 is axially provided in the main shaft 10, and an internal spray water inlet flow channel 12 is radially provided in the main shaft 10, and the internal spray water inlet flow channel 12 communicates the internal spray water inlet channel 31 with the internal spray water outlet flow channel 11, wherein the internal spray water inlet channel 23, the cooling water inlet channel 25, and the cooling water outlet channel 27 are arranged at a staggered angle in the cantilever outer cylinder 20 so that they are not communicated with each other.

[0042] Specifically, the number of the internal spray water inlet flow channels 12 is preferably plural. For example, in this embodiment, the number is two, and the circumferential direction of the main shaft 10 is provided with a 180-degree interval between the two internal spray water inlet flow channels 12, as Figure 4 shown. In this way, after the internal spray water enters the first annular groove 311, it can separately enter the second annular groove 312 quickly through the four internal spray water inlet channels 31, and then separately enter the internal spray water outlet flow channel 11 quickly through the two internal spray water inlet flow channels 12 from the second annular groove 312.

[0043] Further, a cutting head 28 is connected to the end of the cantilever outer cylinder 20.

[0044] When the roadheader is working, the internal spray water enters from the internal spray water inlet 22, then is conducted to the first annular groove 311 via the internal spray water inlet channel 23, and then separately enters the second annular groove 312 through the four internal spray water inlet channels 31, and then separately enters the internal spray water outlet flow channel 11 of the main shaft 10 through the two internal spray water inlet flow channels 12 from the second annular groove 312, and then is conducted to the water spraying seat on the cutting head 28 from the internal spray water outlet flow channel 11, so that the internal spray water is ejected from the water spraying seat.

[0045] Cooling water enters from the cooling water inlet 24, then is conducted through the cooling water inlet channel 25 to the third annular groove 351, and then separates from the third annular groove 351 and is conducted through a plurality of cooling water inlet channels 35 to the first annular water chamber 32 of the annular water jacket 30. Then, it is conducted from the first annular water chamber 32 to the second annular water chamber 33 through the communication hole 34, and then separates from the second annular water chamber 33 and is conducted through a plurality of cooling water outlet channels 36 to the fourth annular groove 361. Then, it is conducted from the fourth annular groove 361 through the cooling water outlet channel 27 to the cooling water outlet 26, thereby realizing the cooling of the entire annular water jacket 30.

[0046] Understandably, for the convenience of the flow of the internal spray water and the cooling water, all the process holes generated during the processing that are not needed can be blocked by the plug 45.

[0047] The annular water jacket and the internal spray system for the roadheader provided by the embodiments of the present invention have a simple structure, reliable functions, are convenient for processing and maintenance, and have a low cost. The annular water jacket itself has a cooling system, and the entire annular water jacket can be cooled by the cooling water flowing through the two annular water chambers of the annular water jacket, so that the temperature of the annular water jacket will not be too high, thereby reducing the service life of the annular water jacket and the grease seal ring. Further, the internal spray system has a plurality of rotating seal points between the main shaft and the annular water jacket. This frame structure can use another rotating seal point after one rotating seal point is worn, thereby reducing the maintenance times of the main shaft and improving the service life.

[0048] The present invention has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An annular water jacket (30) for a roadheader, characterized in that, The annular water jacket (30) is axially penetrated with a main shaft mounting hole (30a), and the annular water jacket (30) is radially penetrated with an internal spray water inlet passage (31). The internal spray water inlet passage (31) is used to conduct the internal spray water from the outside of the annular water jacket (30) to the inside of the main shaft (10). Two annular water chambers separated from each other are circumferentially arranged inside the annular water jacket (30), namely a first annular water chamber (32) and a second annular water chamber (33). A communication hole (34) is arranged inside the annular water jacket (30) to communicate the first annular water chamber (32) with the second annular water chamber (33). The annular water jacket (30) is radially provided with a cooling water inlet passage (35), and the cooling water inlet passage (35) communicates with the first annular water chamber (32) to conduct the cooling water from the outside of the annular water jacket (30) into the first annular water chamber (32). The annular water jacket (30) is radially provided with a cooling water outlet passage (36), and the cooling water outlet passage (36) communicates with the second annular water chamber (33) to discharge the cooling water from the second annular water chamber (33) to the outside of the annular water jacket (30).

2. The annular water jacket (30) according to claim 1, characterized in that, Axially along the annular water jacket (30), the first annular water chamber (32) and the second annular water chamber (33) are respectively located on both sides of the internal spray water inlet passage (31).

3. The annular water jacket (30) according to claim 1, characterized in that, Axially along the annular water jacket (30), a plurality of first annular sealing grooves (37) spaced from each other are respectively arranged on the inner circumferential surface of the annular water jacket (30) on both sides of the internal spray water inlet passage (31), and each first annular sealing groove (37) is used for installing a first annular sealing ring (41).

4. The annular water jacket (30) according to claim 3, characterized in that, Axially along the annular water jacket (30), a second annular sealing groove (38) is respectively arranged on the outer circumferential surface of the annular water jacket (30) on both sides of the cooling water inlet passage (35), and each second annular sealing groove (38) is used for installing a second annular sealing ring (42); axially along the annular water jacket (30), a third annular sealing groove (39) is respectively arranged on the outer circumferential surface of the annular water jacket (30) on both sides of the cooling water inlet passage (35), and each third annular sealing groove (39) is used for installing a third annular sealing ring (43).

5. The annular water jacket (30) according to claim 1, wherein, A first annular groove (311) is recessed at the top position corresponding to the internal spray water inlet passage (31) on the outer circumferential surface of the annular water jacket (30), and a second annular groove (312) is recessed at the bottom position corresponding to the internal spray water inlet passage (31) on the inner circumferential surface of the annular water jacket (30). The first annular groove (311) is communicated with the second annular groove (312) through the internal spray water inlet passage (31).

6. The annular water jacket (30) according to claim 5, characterized in that, On the outer peripheral surface of the annular water jacket (30), a third annular groove (351) is recessed at a position corresponding to the top end of the cooling water inlet passage (35), and the third annular groove (351) communicates with the cooling water inlet passage (35); on the outer peripheral surface of the annular water jacket (30), a fourth annular groove (361) is recessed at a position corresponding to the top end of the cooling water outlet passage (36), and the fourth annular groove (361) communicates with the cooling water outlet passage (36).

7. An internal spray system for a roadheader, characterized in that, Comprising the annular water jacket (30) according to any one of claims 1-6.

8. The internal spray system according to claim 7, characterized in that, The internal spray system further includes a main shaft (10) and a cantilever outer cylinder (20). The annular water jacket (30) is sleeved on the main shaft (10) through the main shaft mounting hole (30a). An assembly hole (21) is axially provided in the cantilever outer cylinder (20). The annular water jacket (30) and the main shaft (10) are assembled in the assembly hole (21). The annular water jacket (30) is located between the main shaft (10) and the cantilever outer cylinder (20), wherein the annular water jacket (30) is fixed to the cantilever outer cylinder (20) and is stationary with the cantilever outer cylinder (20), and the main shaft (10) can rotate within the annular water jacket (30).

9. The internal spray system according to claim 8, characterized in that The cantilever outer cylinder (20) is provided with an internal spray water inlet (22) and an internal spray water inlet channel (23). The internal spray water inlet channel (23) communicates the internal spray water inlet (22) with the internal spray water inlet passage (31); the cantilever outer cylinder (20) is provided with a cooling water inlet (24) and a cooling water inlet channel (25). The cooling water inlet channel (25) communicates the cooling water inlet (24) with the cooling water inlet passage (35); the cantilever outer cylinder (20) is provided with a cooling water outlet (26) and a cooling water outlet channel (27). The cooling water outlet channel (27) communicates the cooling water outlet passage (36) with the cooling water outlet (26); an internal spray water outlet flow passage (11) is axially provided in the main shaft (10), and an internal spray water inlet flow passage (12) is radially provided in the main shaft (10). The internal spray water inlet flow passage (12) communicates the internal spray water inlet passage (31) with the internal spray water outlet flow passage (11), and the internal spray water inlet channel (23), the cooling water inlet channel (25) and the cooling water outlet channel (27) do not communicate with each other.

10. The internal spray system according to claim 9, characterized in that, The number of the internal spray water inlet passages (31) is four, and every two adjacent internal spray water inlet passages (31) are arranged at an interval of 90 degrees in the circumferential direction of the annular water jacket (30); the number of the internal spray water inlet flow passages (12) is two, and the two internal spray water inlet passages (31) are arranged at an interval of 180 degrees in the circumferential direction of the main shaft (10).

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