Telescopic cutting section internal spraying and heading machine

Abstract

The utility model relates to the technical field of mining equipment, especially to a telescopic cutting part internal spraying and heading machine. The telescopic cutting part internal spraying comprises: a telescopic shaft is connected with the output shaft of a speed reducer; the output shaft of the speed reducer drives the cutting head shaft to rotate through the telescopic shaft; a water pump is installed on the cutting head shaft; a connecting assembly is connected with the power input end and the input shaft of the water pump respectively, so that the input shaft drives the water pump to work; a sealing sleeve is arranged on the radial outer side of the cutting head shaft, and a first water channel of the water inlet channel of the water pump is arranged on the sealing sleeve; a telescopic cylinder group is arranged on the radial outer side of the sealing sleeve and fixed with the shell of the speed reducer; a second water channel of the first water channel is arranged on the telescopic cylinder group. The utility model utilizes the speed difference between the input shaft and the output shaft to drive the water pump, so that the hydraulic oil circuit for driving the water pump to work is not needed, the overall structure is simple and compact, the leakage risk is reduced, and the performance and service life of the heading machine are improved.

Description

Technical Field

[0001] This utility model relates to the field of mining equipment technology, and in particular to a telescopic cutting section internal spraying and tunneling machine. Background Technology

[0002] A tunneling machine (TBM) is a combined unit capable of cutting, loading, transporting, self-propelled movement, and dust suppression via spraying. The cutting section of a TBM includes a cutting head shaft and a cutting head. The cutting head shaft drives the cutting head to rotate, thus breaking the rock. TBMs typically have an internal spray system for cooling and dust suppression. To supply high-pressure water to the cutting head, a water pump is installed within the cutting section. Current dedicated internal spray water pumps for TBMs are hydraulically driven, requiring inlet and outlet oil pipelines. This results in numerous leaks due to complex sealing structures, difficult and costly manufacturing of parts, and hinders widespread adoption. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a telescopic cutting section internal spraying and tunneling machine to solve the problems of the spray water pump used in the internal spraying system of the telescopic cutting section of the existing tunneling machine being hydraulically driven, which is prone to increased leakage risk due to multiple sealing structures, and has complex pipelines, high manufacturing costs, and is not conducive to promotion.

[0004] The first aspect of this utility model provides a telescopic cutting section internal spray, comprising: A speed reduction mechanism has an input shaft and an output shaft, wherein the input shaft and the output shaft have a speed difference; A telescopic shaft is connected to the output shaft; A cutting head shaft is disposed at the end of the telescopic shaft away from the output shaft, such that the output shaft drives the cutting head shaft to rotate via the telescopic shaft; the cutting head shaft is provided with a mounting cavity; A water pump is installed in the mounting cavity, so that the water pump rotates together with the cutting head shaft. The water pump has a power input end and a water passage. The cutting head shaft has an inlet channel that connects to the water passage. A connecting component is provided to connect the power input terminal and the input shaft respectively, so that the input shaft drives the water pump to work; A sealing sleeve is provided on the radial outer side of the cutting head shaft, and the sealing sleeve has a first water passage that connects to the water inlet channel; A telescopic cylinder assembly is arranged radially outside the sealing sleeve and fixed to the housing of the deceleration mechanism; a second water channel is provided on the telescopic cylinder assembly to connect to the first water channel.

[0005] Preferably, the rotation axis of the water pump is parallel to or coincides with the axis of the cutting head shaft.

[0006] Preferably, the input shaft and the output shaft are spaced apart axially, and the output shaft and the telescopic shaft have a connecting channel inside, and the connecting component passes through the connecting channel to connect with the power input end and the input shaft; The connecting assembly includes a telescopic coupling and a drive shaft connected to each other. The telescopic coupling is connected to the power input end, and the input shaft is connected to the drive shaft.

[0007] Preferably, it further includes: A first bearing is radially disposed between the connecting channel on the drive shaft and the output shaft, and the lubrication system of the reduction mechanism is connected to the first bearing; A bearing cap is installed on the output shaft and abuts against the side of the first bearing facing the telescopic shaft in the axial direction. An oil seal is disposed radially between the bearing cap and the drive shaft, and axially at one end of the first bearing facing the telescopic shaft.

[0008] Preferably, it further includes: A telescopic protective cylinder is arranged on the radial outer side of the telescopic cylinder assembly, and there is an installation gap between the telescopic protective cylinder and the telescopic cylinder assembly; The water inlet pipe is located in the installation gap and is connected to the second water passage.

[0009] Preferably, the telescopic cylinder assembly includes: A telescopic inner cylinder is provided around the sealing sleeve, and the second water passage is opened on the telescopic inner cylinder; A telescopic outer cylinder is provided around the circumferential outer wall of the telescopic inner cylinder, and the installation gap is formed between the outer wall of the telescopic outer cylinder and the inner wall of the telescopic protective cylinder.

[0010] Preferably, it further includes: The second bearing is disposed on the radial inner side of the telescopic cylinder assembly, and multiple second bearings are arranged at intervals along the axial direction. A lubrication pipeline is provided in the installation gap, and a lubrication channel communicating with the lubrication pipeline and the second bearing is provided on the telescopic cylinder assembly; An exhaust pipe is provided in the installation gap, and an exhaust channel communicating with the exhaust pipe and the second bearing is provided on the telescopic cylinder assembly.

[0011] Preferably, a rotary sealing part that cooperates with the cutting head shaft seal is provided on the radial inner surface of the sealing sleeve, and a plurality of rotary sealing parts are arranged at axial intervals, and the outlet of the first water passage is arranged between two adjacent rotary sealing parts.

[0012] Preferably, the outer radial wall of the sealing sleeve is formed with a limiting boss that protrudes outward in the radial direction; The spray system within the telescopic cutting section also includes: A sealing element is axially sandwiched between the limiting boss and the telescopic cylinder assembly. The sealing element has multiple hole structures, including a water inlet hole connecting the first water passage and the second water passage, an exhaust hole connecting the exhaust channel and the second bearing, and a blind hole blocking the lubrication channel. The sealing element has a receiving groove at its axial end, and the receiving groove is formed as an annular structure surrounding the hole structures. A first sealing ring is disposed within the receiving groove, with a portion of the first sealing ring extending beyond the receiving groove and abutting against the axial end of the limiting boss or the axial end of the telescopic cylinder assembly.

[0013] The second aspect of this utility model provides a tunneling machine, including the telescopic cutting section internal spray as described in any of the above technical solutions.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: In the telescopic cutting section spraying mechanism of this utility model, the reduction mechanism has an input shaft and an output shaft with a speed difference between them; the telescopic shaft is connected to the output shaft; the cutting head shaft is located at the end of the telescopic shaft away from the output shaft, so that the output shaft drives the cutting head shaft to rotate via the telescopic shaft; a mounting cavity is provided on the cutting head shaft; a water pump is installed in the mounting cavity, so that the water pump rotates together with the cutting head shaft, the water pump has a power input end and a water passage, and a water inlet channel connected to the water passage is provided on the cutting head shaft; a connecting assembly connects the power input end of the water pump and the input shaft respectively, so that the input shaft drives the water pump. The machine operates as follows: a sealing sleeve surrounds the radial outer side of the cutting head shaft, and a first water passage is provided on the sealing sleeve to connect to the water inlet channel; a telescopic cylinder assembly surrounds the radial outer side of the sealing sleeve and is fixed to the housing of the reduction mechanism; a second water passage is provided on the telescopic cylinder assembly to connect to the first water passage, thus supplying water to the water pump. The water pump is driven by the speed difference between the input shaft and the output shaft, thereby eliminating the need for an additional hydraulic oil circuit to drive the water pump. This makes the overall structure simple and compact, easy to install, reduces leakage risk and cost, facilitates the standardization of the internal spray structure, and improves the performance and service life of the tunneling machine.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the internal spray structure of the telescopic cutting section provided for an embodiment of this utility model; Figure 2 A cross-sectional view of the internal spray structure of the telescopic cutting section provided for an embodiment of this utility model; Figure 3 A schematic diagram of the internal spray mechanism of the telescopic cutting section provided in an embodiment of this utility model from another perspective; Figure 4 For along Figure 3 A partial cross-sectional view of the structure cut open at section AA; Figure 5 for Figure 4 Enlarged structural diagram at point D; Figure 6 For along Figure 3 A partial cross-sectional view of the structure cut open from the middle section BB; Figure 7 for Figure 6 Enlarged structural diagram at point E; Figure 8 For along Figure 3 A partial cross-sectional view of the structure cut open by the CC section; Figure 9 for Figure 8 Enlarged structural diagram at point F; Figure 10 for Figure 8 A magnified structural diagram of point G in the middle.

[0018] Icons: 10-Reduction mechanism; 11-Input shaft; 12-Output shaft; 20-Telescopic shaft; 30-Cutting head shaft; 31-Water inlet channel; 32-Water outlet channel; 33-Cutting head; 40-Water pump; 41-Power input end; 51-Telescopic coupling; 52-Drive shaft; 53-Connecting bushing; 60-Sealing sleeve; 61-Rotating seal; 62-First water passage; 63-Limiting boss; 71-Telescopic inner cylinder; 72-Telescopic outer cylinder; 701-Second water passage; 702-Lubrication channel; 703-Exhaust channel; 81-First bearing; 82-Bearing cover; 83-Oil seal; 84-Second bearing; 90-Telescopic protective cylinder; 91-Installation clearance; 901-Water inlet pipe; 902-Lubrication pipe; 903-Exhaust pipe; 100-Seal; 101-First sealing ring; 102-Second sealing ring. Detailed Implementation

[0019] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0020] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0021] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0022] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0023] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0024] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0025] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0026] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0027] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0028] According to a first aspect of the present invention, a telescopic cutting section internal spray is provided, which includes a deceleration mechanism 10, a telescopic shaft 20, a cutting head shaft 30, a water pump 40, a connecting assembly, a sealing sleeve 60, and a telescopic cylinder assembly.

[0029] The specific structure of the above-mentioned component sprayed inside the telescopic cutting section according to this embodiment will be described below.

[0030] In this embodiment, as Figure 1 and Figure 2As shown, the reduction mechanism 10 has an input shaft 11 and an output shaft 12. The kinetic energy output from the input shaft 11 is transmitted to the output shaft 12 via a planetary gear train or other reduction components (such as a gear set), so that the input shaft 11 and the output shaft 12 have a speed difference. The telescopic shaft 20 is connected to the output shaft 12, so that the telescopic shaft 20 can rotate synchronously with the output shaft 12. The telescopic shaft 20 and the output shaft 12 can be circumferentially fixed by a spline structure. The telescopic shaft 20 and the output shaft 12 can be fixed axially by fastening pins or mounting screws.

[0031] like Figure 2 As shown, the cutting head shaft 30 is located at the end of the telescopic shaft 20 away from the output shaft 12. Specifically, the cutting head shaft 30 and the telescopic shaft 20 are circumferentially fixed by a connecting bushing 53. The connecting bushing 53 has keyed connection structures, such as spline structures, at both ends in its length direction, so that the output shaft 12 drives the cutting head shaft 30 to rotate via the telescopic shaft 20.

[0032] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, a cutting head 33 is mounted on one axial end of the cutting head shaft 30. The cutting head shaft 30 has a mounting cavity, which can be a groove structure formed by an inward indentation at the end of the cutting head shaft 30 facing the telescopic shaft 20. A water pump 40 is mounted in the mounting cavity, allowing the water pump 40 to rotate together with the cutting head shaft 30. The water pump 40 has a power input end 41 and a water passage. The power input end 41 can be a shaft structure, such as a gear shaft or a shaft with a key structure on its axial outer wall. The power input end 41 is located on the side of the water pump 40 facing the opening of the mounting cavity. The cutting head shaft 30 has an inlet channel 31 and an outlet channel 32 connecting the water passage. Water enters the water passage through the inlet channel 31, and the high-pressure water generated by the water pump 40 can be delivered to the outlet channel 32. Preferably, a nozzle is provided at the end of the outlet channel 32 to allow water mist to be sprayed from the nozzle.

[0033] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the sealing sleeve 60 is formed as a sleeve structure surrounding the radial outer side of the cutting head shaft 30. The sealing sleeve 60 has a first water passage 62 that connects to the water inlet channel 31. The telescopic cylinder assembly surrounds the radial outer side of the sealing sleeve 60 and is fixed to the housing of the deceleration mechanism 10. The telescopic cylinder assembly has a second water passage 701 that connects to the first water passage 62, so that water can enter the water pump 40 sequentially through the second water passage 701, the first water passage 62 and the water inlet channel 31.

[0034] In this embodiment, as Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the connecting assembly connects the power input end 41 of the water pump 40 and the input shaft 11 respectively, so that the input shaft 11 drives the water pump 40 to work. The power transmitted by the input shaft 11 can not only drive the output shaft 12, but also be transmitted to the power input end 41 through the connecting assembly. In this way, the speed difference between the input shaft 11 and the output shaft 12 is used to provide driving force for the water pump 40. Thus, there is no need to set up an additional hydraulic oil circuit to drive the water pump 40. Only the water circuit needs to be laid in the cutting section. This makes the overall structure simple and compact, easy to install, reduces the risk of leakage and cost, helps to standardize the internal spray structure, and can also improve the performance and service life of the internal spray of the telescopic cutting section.

[0035] It should be noted that in this application, the water pump 40 is mounted on the cutting head shaft 30, which has the advantage of reliable sealing. If the water pump 40 is mounted on the output shaft 12, the high-pressure water output by the water pump 40 needs to be delivered into the cutting head shaft 30 through a telescopic sealing structure, which would result in unreliable sealing.

[0036] In a preferred embodiment, such as Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the rotation axis of the water pump 40 is set parallel to or coincides with the axis of the cutting head shaft 30. This reduces the weakening of the structural strength of the cutting head shaft 30 by the opening of the mounting cavity, thereby improving the performance and service life of the cutting head shaft 30, and also improving its machinability and assembly processability.

[0037] like Figure 2 , Figure 4 , Figure 6 and Figure 8 As shown, the input shaft 11 and the output shaft 12 are axially spaced apart. A connecting channel is provided inside the output shaft 12 and the telescopic shaft 20. A connecting component passes through the connecting channel and connects to the power input end 41 and the input shaft 11. This layout improves structural compactness. Preferably, the connecting component is coaxially arranged with the output shaft 12 and the telescopic shaft 20.

[0038] Specifically, the connecting components include a telescopic coupling 51 and a drive shaft 52 connected to each other. The telescopic coupling 51 can be a telescopic universal coupling. Because the telescopic structure inevitably has gaps, and these gaps gradually increase during use, a telescopic universal coupling is used to achieve three-dimensional multi-directional steering transmission and eliminate the impact of gaps on transmission. The telescopic coupling 51 is connected to the power input end 41, and the input shaft 11 is connected to the drive shaft 52.

[0039] Preferably, the rotation axis of the water pump 40 is the same as the rotation axis of the telescopic coupling 51 and the rotation axis of the transmission shaft 52.

[0040] Furthermore, in this embodiment, as Figure 10 As shown, the internal spray of the telescopic cutting section also includes a first bearing 81, a bearing cover 82, and an oil seal 83. The first bearing 81 is radially disposed between the connecting channel on the drive shaft 52 and the output shaft 12. The lubrication system of the reduction mechanism 10 is connected to the first bearing 81, so that the lubrication system of the reduction mechanism 10 directly supplies lubricating oil to the first bearing 81. The bearing cover 82 is installed on the output shaft 12 and abuts against the side of the first bearing 81 facing the telescopic shaft 20 in the axial direction. The bearing cover 82 can be fixed to the output shaft 12 by screws or other structures. The bearing cover 82 is formed into a cylindrical structure for the drive shaft 52 to pass through. The oil seal 83 is radially disposed between the bearing cover 82 and the drive shaft 52 and axially disposed at the end of the first bearing 81 facing the telescopic shaft 20, so as to prevent the lubricating oil in the first bearing 81 from leaking.

[0041] In this embodiment, as Figure 6 and Figure 7 As shown, the telescopic cutting section spray also includes a telescopic protective cylinder 90 and a water inlet pipe 901. The telescopic protective cylinder 90 is formed into a cylindrical structure and surrounds the radial outer side of the telescopic cylinder assembly. There is an installation gap 91 between the telescopic protective cylinder 90 and the telescopic cylinder assembly, so that the inner wall of the telescopic protective cylinder 90 and the outer wall of the telescopic cylinder assembly are radially spaced apart. The water inlet pipe 901 is disposed in the installation gap 91. The water inlet pipe 901 is a tubular structure and is connected to the second water passage 701, so that external water sources can be transported through the water inlet pipe 901 to supply water to the second water passage 701.

[0042] In this embodiment, the water inlet pipe 901 can be configured as one or multiple according to the actual water supply demand, and the second water passage 701 and the first water passage 62 are configured in a one-to-one correspondence with the water inlet pipe 901. When multiple water inlet pipes 901 are configured, preferably, at least two water inlet pipes 901 are configured to be radially opposite to each other.

[0043] Furthermore, in this embodiment, as Figures 1 to 8 As shown, the telescopic cylinder assembly includes a telescopic inner cylinder 71 and a telescopic outer cylinder 72 that are slidably connected to each other. The telescopic inner cylinder 71 is formed as a cylindrical structure surrounding a sealing sleeve 60, such that the sealing sleeve 60 is radially sandwiched between the telescopic inner cylinder 71 and the cutting head shaft 30. A second water passage 701 is opened on the telescopic inner cylinder 71. The telescopic outer cylinder 72 is sleeved on the circumferential outer wall of the telescopic inner cylinder 71 and connected to the housing of the deceleration mechanism 10. An installation gap 91 is formed between the outer wall of the telescopic outer cylinder 72 and the inner wall of the telescopic protective cylinder 90.

[0044] Optionally, the sealing sleeve 60 and the telescopic cylinder assembly are configured as an integral structure, for example, the sealing sleeve 60 and the telescopic inner cylinder 71 are configured as an integral structure; preferably, in order to facilitate maintenance and modular assembly, the sealing sleeve 60 and the telescopic cylinder assembly are configured as separate structures, and the sealing sleeve 60 can be installed on the telescopic inner cylinder 71.

[0045] Furthermore, such as Figure 4 , Figure 5 , Figure 8 and Figure 9 As shown, the telescopic cutting section's internal spray also includes a bearing assembly, a lubrication pipe 902, and an exhaust pipe 903. The bearing assembly includes multiple second bearings 84 disposed radially inside the telescopic cylinder assembly. The multiple second bearings 84 are arranged axially at intervals to provide support and improve the overall structural rigidity. The lubrication pipe 902 is disposed in the installation gap 91. The telescopic cylinder assembly has a lubrication channel 702 communicating with the lubrication pipe 902 and the second bearings 84, allowing lubricating oil to flow into the lubrication channel 702 through the lubrication pipe 902 and then flow from the outlet side of the lubrication channel 702 to the second bearings 84. The exhaust pipe 903 is disposed in the installation gap 91. The telescopic cylinder assembly has an exhaust channel 703 communicating with the exhaust pipe 903 and the second bearings 84 to ensure smooth lubricating oil supply, and overflowing lubricating oil can also be discharged from the exhaust pipe 903.

[0046] It should be noted that some of the second bearings 84 are located on both sides of the sealing sleeve 60 in the axial direction. In order to ensure that the lubricating oil can lubricate all the second bearings 84, the sealing sleeve 60 can be provided with lubrication through holes for lubricating oil to pass through, as well as venting through holes for gas or overflowing lubricating oil to pass through.

[0047] It should be further noted that the water inlet of the water inlet pipe 901, the oil inlet of the lubrication pipe 902, and the exhaust port of the exhaust pipe 903 can all be located on the outer wall of the telescopic protective cylinder 90.

[0048] In this embodiment, as Figure 3 , Figure 5 and Figure 7 As shown, a rotary sealing part 61 that seals with the cutting head shaft 30 is provided on the radial inner surface of the sealing sleeve 60. Multiple rotary sealing parts 61 are spaced apart along the axial direction. The outlet of the first water passage 62 is located between two adjacent rotary sealing parts 61. This achieves a sealed connection between the first water passage 62 on the sealing sleeve 60 and the water passage in the water pump 40, ensuring that all the water flowing out of the first water passage 62 can enter the water passage.

[0049] Specifically, the structure of the rotary sealing part 61 can be that an annular groove is opened on the radial inner surface of the sealing sleeve 60, and an elastic sealing structure such as a sealing ring is embedded in the annular groove, with part of the sealing structure protruding out of the annular groove and contacting the outer wall of the cutting head shaft 30.

[0050] Preferably, sealing can be achieved by providing a rotary sealing part 61 on each side of the outlet of the first water channel 62 in the axial direction. Since the rotary sealing part 61 has a clamping effect on the cutting head shaft 30, reducing the rotary sealing part 61 can reduce the starting torque and reduce heat generation.

[0051] Furthermore, such as Figures 2 to 9 As shown, the radial outer wall of the sealing sleeve 60 has a limiting boss 63 that protrudes radially outward; preferably, the limiting boss 63 is located at one end of the sealing sleeve 60 in the axial direction. The telescopic cutting section spray also includes a sealing element 100 and a first sealing ring 101. The sealing element 100 is formed into a ring structure and is sandwiched between the limiting boss 63 and the telescopic cylinder assembly in the axial direction. The sealing element 100 has multiple hole structures, including a water inlet hole connecting the first water channel 62 and the second water channel 701, an exhaust hole connecting the exhaust channel 703 and the second bearing 84, and a blind hole blocking the lubrication channel 702 to meet the water supply requirements of the water pump 40 and the lubrication requirements of the second bearing 84; the sealing element 100 also has mounting holes, through which fasteners such as screws can be passed to fix the sealing element 100 to the telescopic cylinder assembly.

[0052] Specifically, the sealing element 100 has a receiving groove at its axial end. The receiving groove is formed as an annular structure surrounding the hole structure, so that the inner wall of the hole structure on the sealing element 100 has a boss. The first sealing ring 101 is disposed in the receiving groove, and a portion of the first sealing ring 101 extends out of the receiving groove and abuts against the axial end of the limiting boss 63 or the axial end of the telescopic cylinder assembly.

[0053] In this embodiment, the use of a seal 100 improves the ease and reliability of assembling the first sealing ring 101, resulting in better manufacturability. In other alternative embodiments, the seal 100 may be omitted, and the first sealing ring 101 may be directly installed in the groove structure on the sealing sleeve 60 and / or the telescopic cylinder assembly. In addition, in this embodiment, a second sealing ring 102 is provided between the telescopic protective cylinder 90 and the telescopic cylinder assembly. The second sealing ring 102 can be embedded in the groove structure on the telescopic protective cylinder 90 or the telescopic cylinder assembly to achieve a sealed connection between the telescopic protective cylinder 90 and the telescopic cylinder assembly.

[0054] It should be noted that, in this embodiment, both the first sealing ring 101 and the second sealing ring 102 can adopt an elastic sealing structure.

[0055] In a preferred embodiment, a ceramic coating is provided on the surface of the cutting head shaft 30 that mates with the sealing sleeve 60. The ceramic coating can be formed on the surface of the cutting head shaft 30 by spraying, thereby improving the wear resistance of the cutting head shaft 30 and extending its service life.

[0056] The telescopic cutting section spray according to this utility model has a reasonable structural layout, good manufacturability, and is conducive to production and popularization. The reduction mechanism has an input shaft and an output shaft with a speed difference between them; the telescopic shaft is connected to the output shaft; the cutting head shaft is located at the end of the telescopic shaft away from the output shaft, so that the output shaft drives the cutting head shaft to rotate via the telescopic shaft; the cutting head shaft has a mounting cavity; a water pump is installed in the mounting cavity, so that the water pump rotates together with the cutting head shaft; the water pump has a power input end and a water passage, and the cutting head shaft has a water inlet channel connecting to the water passage; the connecting assembly connects the power input end of the water pump and the input shaft respectively, so that... The input shaft drives the water pump; a sealing sleeve surrounds the radial outside of the cutting head shaft, and a first water passage is opened on the sealing sleeve to connect to the water inlet channel; a telescopic cylinder assembly surrounds the radial outside of the sealing sleeve and is fixed to the housing of the reduction mechanism; a second water passage is opened on the telescopic cylinder assembly to connect to the first water passage, thus achieving water supply to the water pump. The speed difference between the input shaft and the output shaft is used to drive the water pump, thereby eliminating the need for an additional hydraulic oil circuit to drive the water pump. This makes the overall structure simple and compact, easy to install, reduces leakage risk and cost, and facilitates the standardization of the internal spray structure, thereby improving the performance and service life of the telescopic cutting section's internal spray.

[0057] The second aspect of this utility model provides a tunneling machine that includes the telescopic cutting section spray as described above, thus having all the beneficial effects of the telescopic cutting section spray, which will not be repeated here.

[0058] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A telescopic cutting section internal spray, characterized in that, include: A speed reduction mechanism has an input shaft and an output shaft, wherein the input shaft and the output shaft have a speed difference; A telescopic shaft is connected to the output shaft; A cutting head shaft is disposed at the end of the telescopic shaft away from the output shaft, such that the output shaft drives the cutting head shaft to rotate via the telescopic shaft; the cutting head shaft is provided with a mounting cavity; A water pump is installed in the mounting cavity, so that the water pump rotates together with the cutting head shaft. The water pump has a power input end and a water passage. The cutting head shaft has an inlet channel that connects to the water passage. A connecting component is provided to connect the power input terminal and the input shaft respectively, so that the input shaft drives the water pump to work; A sealing sleeve is provided on the radial outer side of the cutting head shaft, and the sealing sleeve has a first water passage that connects to the water inlet channel; A telescopic cylinder assembly is arranged radially outside the sealing sleeve and fixed to the housing of the deceleration mechanism; a second water channel is provided on the telescopic cylinder assembly to connect to the first water channel.

2. The telescopic cutting section internal spray according to claim 1, characterized in that, The rotation axis of the water pump is set parallel to or coincides with the axis of the cutting head shaft.

3. The telescopic cutting section internal spray according to claim 1, characterized in that, The input shaft and the output shaft are spaced apart axially. A connecting channel is provided inside the output shaft and the telescopic shaft. The connecting component passes through the connecting channel and connects to the power input end and the input shaft. The connecting assembly includes a telescopic coupling and a drive shaft connected to each other. The telescopic coupling is connected to the power input end, and the input shaft is connected to the drive shaft.

4. The telescopic cutting section internal spray according to claim 3, characterized in that, Also includes: A first bearing is radially disposed between the connecting channel on the drive shaft and the output shaft, and the lubrication system of the reduction mechanism is connected to the first bearing; A bearing cap is installed on the output shaft and abuts against the side of the first bearing facing the telescopic shaft in the axial direction. An oil seal is disposed radially between the bearing cap and the drive shaft, and axially at one end of the first bearing facing the telescopic shaft.

5. The telescopic cutting section internal spray according to claim 1, characterized in that, Also includes: A telescopic protective cylinder is arranged radially outside the telescopic cylinder assembly, and there is an installation gap between the telescopic protective cylinder and the telescopic cylinder assembly; The water inlet pipe is located in the installation gap and is connected to the second water passage.

6. The telescopic cutting section internal spray according to claim 5, characterized in that, The telescopic cylinder assembly includes: A telescopic inner cylinder is provided around the sealing sleeve, and the second water passage is opened on the telescopic inner cylinder; A telescopic outer cylinder is provided around the circumferential outer wall of the telescopic inner cylinder, and the installation gap is formed between the outer wall of the telescopic outer cylinder and the inner wall of the telescopic protective cylinder.

7. The telescopic cutting section internal spray according to claim 5, characterized in that, Also includes: The second bearing is disposed on the radial inner side of the telescopic cylinder assembly, and multiple second bearings are arranged at intervals along the axial direction. A lubrication pipeline is provided in the installation gap, and a lubrication channel communicating with the lubrication pipeline and the second bearing is provided on the telescopic cylinder assembly; An exhaust pipe is provided in the installation gap, and an exhaust channel communicating with the exhaust pipe and the second bearing is provided on the telescopic cylinder assembly.

8. The telescopic cutting section internal spray according to claim 1, characterized in that, The sealing sleeve has a rotary sealing part that cooperates with the cutting head shaft seal on its radial inner surface. Multiple rotary sealing parts are spaced apart along the axial direction. The outlet of the first water passage is located between two adjacent rotary sealing parts.

9. The telescopic cutting section internal spray according to claim 7, characterized in that, The outer radial wall of the sealing sleeve is formed with a limiting boss that protrudes outward in the radial direction; The spray system within the telescopic cutting section also includes: A sealing element is axially sandwiched between the limiting boss and the telescopic cylinder assembly. The sealing element has multiple hole structures, including a water inlet hole connecting the first water passage and the second water passage, an exhaust hole connecting the exhaust channel and the second bearing, and a blind hole blocking the lubrication channel. The sealing element has a receiving groove at its axial end, and the receiving groove is formed as an annular structure surrounding the hole structures. A first sealing ring is disposed within the receiving groove, with a portion of the first sealing ring extending beyond the receiving groove and abutting against the axial end of the limiting boss or the axial end of the telescopic cylinder assembly.

10. A tunneling machine, characterized in that, Including the telescopic cutting section spray as described in any one of claims 1 to 9.

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