Internal misting system for non-retracting cutting head and tunneling machine

Abstract

The utility model relates to mining equipment parts technical field especially is related to a kind of internal spraying system and tunneling machine for non telescopic cutting part.It is used for the internal spraying system of non telescopic cutting part, including: water pump is installed in the inside of cutting head shaft, the circumferential outer wall of cutting head shaft is provided with sealing sleeve, sealing sleeve is opened on and has water inlet, oil inlet and oil return port;The axis of water pump is parallel or coincides with the axis of cutting head shaft and is arranged;Bearing sleeve is sleeved on the circumferential outer wall of sealing sleeve and is rotationally matched with sealing sleeve, bearing sleeve has water inlet cavity, oil inlet cavity and oil return cavity, which are communicated with water inlet, oil inlet and oil return port, and water inlet hole, oil inlet hole and oil return hole, which are communicated with water inlet cavity, oil inlet cavity and oil return cavity respectively.The axis of water pump of the utility model can be parallel or coincides with the axis of cutting head shaft and is arranged, compared with the water pump of radial installation, the weakening of cutting head shaft structure strength can be reduced, and then service life is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of mining equipment components, and in particular to an internal spraying system for a non-telescopic cutting section and a tunneling machine. Background Technology

[0002] A tunneling machine (TBM) is a combined unit capable of cutting, loading and 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. An internal spray system is typically installed within the TBM for cooling and dust suppression. To supply high-pressure water to the cutting head, a water pump is installed within the cutting section. Currently, the pump's axis is perpendicular to the cutting head shaft. This arrangement severely weakens the strength of the cutting head shaft and components such as the splined sleeve within the cutting section. To ensure strength, the diameter of the cutting head shaft or splined sleeve in the middle needs to be increased, increasing manufacturing difficulty and hindering maintenance. During maintenance, the cutting head shaft or splined sleeve must be completely disassembled to replace the water pump, thus affecting the TBM's performance and service life. Utility Model Content

[0003] In view of this, the purpose of this application is to provide an internal spraying system for a non-telescopic cutting section and a tunneling machine, so as to solve the problem that in the existing internal spraying system of the tunneling machine, the axis of the water pump is set perpendicular to the axis of the cutting head shaft, which reduces the strength of components such as the cutting head shaft and spline sleeve. In order to ensure its strength, the diameter of the middle part of the cutting head shaft or spline sleeve needs to be increased, which increases the manufacturing difficulty and is not conducive to maintenance. During maintenance, the cutting head shaft or spline sleeve must be completely removed to replace the water pump, thus affecting the performance and service life of the tunneling machine.

[0004] The first aspect of this utility model provides an internal spraying system for a non-retractable cutting section, wherein the internal spraying system for the non-retractable cutting section includes: The water pump is equipped with a water supply channel and an oil channel; The cutting head shaft has a water pump installed inside it. A sealing sleeve is provided on the circumferential outer wall of the cutting head shaft. The sealing sleeve has a water inlet communicating with the water supply channel and an oil inlet and an oil return port communicating with the oil channel, respectively. The axis of the water pump is parallel to the axis of the cutting head shaft, or the axis of the water pump coincides with the axis of the cutting head shaft. A bearing sleeve is fitted onto the circumferential outer wall of the sealing sleeve and rotates with the sealing sleeve. The inner wall of the bearing sleeve forms a water inlet cavity communicating with the water inlet, an oil inlet cavity communicating with the oil inlet, and an oil return cavity communicating with the oil return cavity. The outer wall of the bearing sleeve is provided with a water inlet hole communicating with the water inlet cavity, an oil inlet hole communicating with the oil inlet cavity, and an oil return hole communicating with the oil return cavity.

[0005] Preferably, the sealing sleeve and the cutting head shaft are formed as separate structures, and the cutting head shaft is provided with connecting channels that connect the water inlet and the water supply channel, the oil channel and the oil inlet, and the oil channel and the oil return port respectively; The inner wall of the sealing sleeve is provided with an annular groove for embedding the first sealing element. Multiple annular grooves are provided and are arranged at intervals along the axial direction of the sealing sleeve. The water inlet, the oil inlet and the oil return outlet are provided with annular grooves on both sides of the sealing sleeve in the axial direction.

[0006] Preferably, the sealing sleeve is a ceramic component; Alternatively, the surface of the sealing sleeve may be provided with a ceramic layer.

[0007] Preferably, the inner wall of the bearing sleeve is provided with a plurality of sealing parts arranged at intervals along the axial direction; in the axial direction of the bearing sleeve, the water inlet chamber, the oil inlet chamber and the oil return chamber are respectively arranged between two different and adjacent sealing parts.

[0008] Preferably, the sealing part includes a receiving groove disposed on the inner wall of the bearing sleeve and a second sealing member embedded in the receiving groove, wherein a portion of the second sealing member extends out of the receiving groove and contacts the circumferential outer wall of the sealing sleeve.

[0009] Preferably, the internal spray system for the non-retractable cutting section further includes: A connector is installed on the outer wall of the bearing sleeve, and the connector has channels that communicate with the water inlet, the oil inlet and the oil return hole respectively. Preferably, the internal spray system for the non-retractable cutting section further includes: A protective sleeve is fitted onto the circumferential sidewall of the cutting head shaft; the bearing is fitted inside the protective sleeve. Preferably, the protective cylinder has a first positioning hole extending radially, and the outer wall of the bearing sleeve has a second positioning hole extending radially. The internal spray system for the non-retractable cutting section also includes: An eccentric positioning shaft assembly includes a first positioning member installed in the first positioning hole and a second positioning member installed in the second positioning hole, wherein the first positioning member is connected to the second positioning member. Preferably, a bearing is provided between the bearing sleeve and the sealing sleeve; The two eccentric positioning shaft assemblies are arranged opposite each other on both sides of the bearing sleeve in the radial direction, one of the eccentric positioning shaft assemblies is equipped with an oil injection nozzle, and the other eccentric positioning shaft assembly is equipped with an exhaust valve.

[0010] The second aspect of this utility model provides a tunneling machine, including the internal spraying system for the non-telescopic cutting section described in any of the above technical solutions.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: In the internal spraying system for a non-retractable cutting section of this utility model, the water pump is provided with a water supply channel and an oil channel; the water pump is installed inside the cutting head shaft, and a sealing sleeve is provided on the circumferential outer wall of the cutting head shaft. The sealing sleeve has a water inlet communicating with the water supply channel and an oil inlet and an oil return port communicating with the oil channel respectively; the axis of the water pump is parallel to the axis of the cutting head shaft, or the axis of the water pump coincides with the axis of the cutting head shaft; a bearing sleeve is fitted on the circumferential outer wall of the sealing sleeve and rotates with the sealing sleeve, and the inner wall of the bearing sleeve forms The bearing sleeve has a water inlet chamber connected to the water inlet, an oil inlet chamber connected to the oil inlet, and an oil return chamber connected to the oil return port. The outer wall of the bearing sleeve has a water inlet hole connected to the water inlet chamber, an oil inlet hole connected to the oil inlet chamber, and an oil return hole connected to the oil return chamber. In this way, the channels opened on the bearing sleeve and the sealing sleeve can be used to make the axis of the water pump in the non-telescopic cutting section parallel or coincident with the axis of the cutting head shaft. Compared with the radially installed water pump, the weakening of the structural strength of the cutting head shaft can be reduced, thereby improving the performance and service life of the tunneling machine.

[0012] 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

[0013] 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.

[0014] Figure 1 A schematic diagram of the internal spray system for a non-telescopic cutting section provided for an embodiment of this utility model; Figure 2 A structural cross-sectional view of an internal spray system for a non-telescopic cutting section provided for an embodiment of this utility model; Figure 3 A schematic diagram of the structure of the sealing sleeve in the internal spray system for a non-telescopic cutting section provided for an embodiment of this utility model; Figure 4 A schematic diagram of the bearing sleeve in the internal spray system for a non-telescopic cutting section provided for an embodiment of this utility model; Figure 5 A cross-sectional view of the bearing sleeve in the internal spray system for a non-telescopic cutting section provided for an embodiment of this utility model; Figure 6 A cross-sectional view of the bearing sleeve in the internal spray system for the non-telescopic cutting section provided in an embodiment of the present invention, from another perspective. Figure 7 A structural cross-sectional view of the eccentric positioning shaft assembly in the internal spray system for a non-telescopic cutting section provided for an embodiment of this utility model; Figure 8 A schematic diagram of the eccentric positioning shaft assembly in the internal spray system for a non-telescopic cutting section provided in an embodiment of this utility model from another perspective; Figure 9 A schematic diagram of the structure of the first and second positioning members of the eccentric positioning shaft assembly in the internal spray system for a non-telescopic cutting section provided in an embodiment of the present invention, with an eccentricity of A. Figure 10 A schematic diagram of the structure of the first step and the second step of the second positioning member in the internal spray system for a non-telescopic cutting section provided in an embodiment of the present invention, wherein the eccentricity between them is A.

[0015] Icons: 10-Water pump; 11-High-pressure water outlet; 20-Cutting head shaft; 21-Internal channel; 22-Connecting channel; 30-Sealing sleeve; 31-Connecting spline; 301-Water inlet; 302-Oil inlet; 303-Oil return port; 304-Annular groove; 40-Bearing sleeve; 41-Water inlet chamber; 42-Oil inlet chamber; 43-Oil return chamber; 401-Water inlet hole; 402-Oil inlet hole; 403-Oil return hole; 40 4-Assembly hole; 44-Second positioning hole; 45-Receiving groove; 46-Lubricating oil passage; 51-First seal; 52-Second seal; 60-Connector; 70-Protective sleeve; 71-First positioning hole; 80-Eccentric positioning shaft assembly; 81-First positioning element; 811-Mounting hole; 82-Second positioning element; 821-First step; 822-Second step; 91-Oil nozzle; 92-Exhaust valve. Detailed Implementation

[0016] 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.

[0017] 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.

[0018] 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.

[0019] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] According to a first aspect of the present invention, an internal spraying system for a non-telescopic cutting section is provided, comprising a water pump 10, a cutting head shaft 20, and a bearing sleeve 40.

[0026] The specific structure of the aforementioned components of the internal spray system for the non-retractable cutting section according to this embodiment will be described below.

[0027] In this embodiment, as Figure 1 As shown, the water pump 10 is equipped with a water supply channel to deliver high-pressure water. The output end of the water supply channel forms a high-pressure water outlet 11. An oil channel on the water pump 10 is used to deliver oil, thus providing power for the operation of the water pump 10. The water pump 10 is installed inside the cutting head shaft 20, allowing the entire water pump 10 to rotate together with the cutting head shaft 20; specifically, as shown... Figure 2As shown, a groove is formed at one end of the cutting head shaft 20 along its axial direction, and the water pump 10 is installed in the groove to achieve the installation of the water pump 10 inside the cutting head shaft 20. Preferably, a pressure cap is provided on the side of the water pump 10 facing the opening of the groove. The pressure cap is fixedly connected to the cutting head shaft 20 and abuts against one end of the water pump 10 along its axial direction to fix the water pump 10 in the groove of the cutting head shaft 20.

[0028] The cutting head shaft 20 has an internal channel 21 that connects the high-pressure water outlet 11 and the spray nozzle. The internal channel 21 can be set parallel to or coincide with the axis of the cutting head shaft 20.

[0029] like Figure 2 As shown, a sealing sleeve 30 is provided on the circumferential outer wall of the cutting head shaft 20. The sealing sleeve 30 has a water inlet 301 that communicates with the water supply channel and an oil inlet 302 and an oil return port 303 that communicate with the oil channel, respectively. In this way, water can be supplied to the water supply channel and a loop can be formed with the oil channel through the sealing sleeve 30. This makes the axis of the water pump 10 parallel to the axis of the cutting head shaft 20, or the axis of the water pump 10 coincides with the axis of the cutting head shaft 20. When the water pump 10 is installed inside the cutting head shaft 20, compared with a radially installed water pump, the weakening of the structural strength of the cutting head shaft 20 can be reduced, thereby improving the performance and service life of the cutting part.

[0030] It should be noted that, as Figure 3 As shown, the water inlet 301, oil inlet 302, and oil return port 303 are all formed as through holes. The cutting head shaft 20 has radial channels that connect the water pump 10 and the water inlet 301, oil inlet 302, and oil return port 303 respectively.

[0031] To ensure reliable oil and water supply, in this embodiment, as follows: Figure 2 As shown, the bearing sleeve 40 is fitted onto the circumferential outer wall of the sealing sleeve 30 and rotates with it. The bearing sleeve 40 is formed into an annular cylindrical structure. The inner wall of the bearing sleeve 40 forms a water inlet cavity 41 communicating with the water inlet 301, an oil inlet cavity 42 communicating with the oil inlet 302, and an oil return cavity 43 communicating with the oil return cavity 303. The water inlet cavity 41, the oil inlet cavity 42, and the oil return cavity 43 are all formed into annular cavity structures surrounding the sealing sleeve 30. The outer wall of the bearing sleeve 40 is provided with a water inlet hole 401 communicating with the water inlet cavity 41, an oil inlet hole 402 communicating with the oil inlet cavity 42, and an oil return hole 403 communicating with the oil return cavity 43.

[0032] In this embodiment, external water can be introduced into the water inlet chamber 41 through the water inlet hole 401, then flow through the water inlet 301 to the corresponding radial channel on the cutting head shaft 20, and finally enter the water supply channel in the water pump 10. Furthermore, the oil driving the water pump 10 can be introduced into the oil inlet chamber 42 through the oil inlet hole 402, then flow through the oil inlet 302 to the corresponding radial channel on the cutting head shaft 20, thus entering the oil channel in the water pump 10. The oil then passes through the corresponding radial channel on the cutting head shaft 20, through the oil return port 303, into the oil return chamber 43, and finally exits from the oil return hole 403. In this way, by utilizing the channels opened on the bearing sleeve 40 and the sealing sleeve 30, the axis of the water pump 10 in the non-telescopic cutting section can be set parallel to or coincide with the axis of the cutting head shaft 20, thereby reducing the weakening of the structural strength of the cutting head shaft 20 and improving the performance and service life of the tunneling machine.

[0033] In an alternative embodiment, the sealing sleeve 30 and the cutting head shaft 20 are an integral structure.

[0034] To facilitate maintenance and modular assembly, in a preferred embodiment, such as Figure 2 and Figure 3 As shown, the sealing sleeve 30 and the cutting head shaft 20 are formed as a separate structure, such that the sealing sleeve 30 is formed as a cylindrical structure that is fixedly connected to the radial portion of the outer wall of the cutting head shaft 20; specifically, as shown... Figure 3 As shown, the sealing sleeve 30 is provided with a connecting spline 31 at one axial end. The sealing sleeve 30 and the cutting head shaft 20 are circumferentially fixed through the connecting spline 31. The sealing sleeve 30 can be axially positioned by a retaining ring or other structure installed on the cutting head shaft 20.

[0035] More specifically, such as Figure 2 As shown, when the sealing sleeve 30 and the cutting head shaft 20 are formed into a split structure, the cutting head shaft 20 is provided with connecting channels that connect the water inlet 301 and the water supply channel, the oil channel and the oil inlet 302, and the oil channel and the oil return port 303 respectively. That is, these three connecting channels 22 are set independently to realize the connection of the oil circuit or the water circuit.

[0036] In this embodiment, as Figure 2 As shown, an annular groove 304 for embedding a first sealing element 51 is provided on the inner wall of the sealing sleeve 30. The first sealing element 51 can be an annular sealing ring. Multiple annular grooves 304 are provided, that is, multiple first sealing elements 51 are also provided embedded in the annular grooves 304. Multiple annular grooves 304 are arranged at intervals along the axial direction of the sealing sleeve 30. Specifically, annular grooves 304 are provided on both sides of the water inlet 301, oil inlet 302 and oil return port 303 in the axial direction of the sealing sleeve 30, thereby achieving the sealing of the fluids transported by the water inlet 301, oil inlet 302 and oil return port 303, and preventing water or oil leakage.

[0037] In a first preferred embodiment, the sealing sleeve 30 is a ceramic part, that is, the sealing sleeve 30 is made of ceramic material, so as to improve the wear resistance of the sealing sleeve 30 and extend the service life of the entire cutting part.

[0038] In the second preferred embodiment, a ceramic layer is provided on the surface of the sealing sleeve 30. The ceramic layer can be applied by spraying onto the surface of the sealing sleeve 30 where wear resistance needs to be improved (e.g., the surface where the sealing sleeve 30 contacts the bearing sleeve 40), which has the advantage of reducing costs.

[0039] In this embodiment, as Figure 2 , Figure 5 and Figure 6 As shown, the inner wall of the bearing sleeve 40 is provided with a plurality of sealing parts arranged at intervals along the axial direction to achieve a sealing fit between the bearing sleeve 40 and the sealing sleeve 30. Specifically, in the axial direction of the bearing sleeve 40, the water inlet chamber 41, the oil inlet chamber 42 and the oil return chamber 43 are respectively arranged between two different and adjacent sealing parts, so as to effectively seal and separate the water inlet chamber 41, the oil inlet chamber 42 and the oil return chamber 43 to avoid leakage of water or oil.

[0040] Furthermore, such as Figure 2 , Figure 5 and Figure 6 As shown, the sealing part includes a receiving groove 45 provided on the inner wall of the bearing sleeve 40 and a second sealing member 52 embedded in the receiving groove 45. The receiving groove 45 is preferably formed as an annular groove, and the second sealing member 52 is formed as an annular sealing ring. A portion of the second sealing member 52 extends out of the receiving groove 45 and contacts the circumferential outer wall of the sealing sleeve 30, thereby achieving a sealing fit between the bearing sleeve 40 and the sealing sleeve 30 and ensuring sealing reliability.

[0041] In this embodiment, as Figure 2 As shown, the internal spray system for the non-telescopic cutting section also includes a connector 60 installed on the outer wall of the bearing sleeve 40 and a protective cylinder 70 sleeved on the circumferential side wall of the cutting head shaft 20; the connector 60 can be formed into a block structure, and the connector 60 has channels that communicate with the water inlet 401, the oil inlet 402 and the oil return hole 403 respectively. The connector 60 is used to assemble and fix with the pipeline for conveying oil or water, wherein the pipeline for conveying oil or water is located inside and connected to the oil supply system or water supply system outside the protective cylinder 70.

[0042] like Figure 4 As shown, an assembly hole 404 is provided on the outer wall of the bearing sleeve 40. The connector 60 is fixed to the bearing sleeve 40 by fasteners such as screws passing through the assembly hole 404.

[0043] In this embodiment, as Figure 1 and Figure 2 As shown, the cutting head shaft 20 is rotatably coupled with the protective cylinder 70, and the bearing sleeve 40 is located inside the protective cylinder 70. Furthermore, such as Figure 1 , Figure 4 , Figures 7 to 10 As shown, the protective cylinder 70 has a first positioning hole 71 extending radially, and the outer wall of the bearing sleeve 40 has a second positioning hole 44 extending radially; the internal spray system for the non-telescopic cutting section also includes an eccentric positioning shaft assembly 80 that connects the protective cylinder 70 and the bearing sleeve 40, so as to adjust the different axiality between the bearing sleeve 40 and the protective cylinder 70, thereby reducing the machining accuracy of the fixed shaft holes at both ends of the protective cylinder 70.

[0044] Specifically, the eccentric positioning shaft assembly 80 includes a first positioning member 81 mounted in the first positioning hole 71 and a second positioning member 82 mounted in the second positioning hole 44. The first positioning member 81 and the second positioning member 82 are connected. More specifically, as shown... Figure 1 , Figures 7 to 10 As shown, the portion of the first positioning member 81 that mates with the protective cylinder 70 is formed as a flange structure with multiple mounting holes 811. Fasteners such as screws pass through the mounting holes 811 and connect to the openings on the protective cylinder 70. The end of the first positioning member 81 facing the second positioning member 82 has a groove, and the outer circumferential wall of the second positioning member 82 has a boss, such that the end of the second positioning member 82 that connects with the groove on the first positioning member 81 forms a first step portion 821, and the end of the second positioning member 82 that connects with the bearing sleeve 40 forms a second step portion 821. 22. The axis of the first positioning member 81 is eccentrically set with respect to the axis of the first step portion 821, and the eccentricity between them is A, in mm; the axis of the first step portion 821 is eccentrically set with respect to the axis of the second step portion 822, and the eccentricity between them is A, in mm; before fixing the first positioning member 81 to the protective cylinder 70, rotate the flange structure as described above to adjust the eccentricity between the protective cylinder 70 and the second positioning member 82. After adjusting to the required position, select a suitable mounting hole 811 to fix the first positioning member 81 onto the protective cylinder 70. It should be noted that the adjustment range of the eccentricity is 0 to 2A.

[0045] In this implementation, such as Figure 1 As shown, two eccentric positioning shaft assemblies 80 are arranged opposite each other on both sides of the bearing sleeve 40 in the radial direction to restrict the rotation of the bearing sleeve 40.

[0046] Furthermore, such as Figure 2As shown, a bearing is provided between the bearing sleeve 40 and the sealing sleeve 30. In order to lubricate the bearing, in this embodiment, the eccentric positioning shaft assembly 80 is provided with a channel connecting the bearing between the bearing sleeve 40 and the sealing sleeve 30. One of the two eccentric positioning shaft assemblies 80 is equipped with an oil injection nozzle 91 to enable the connection of lubricating oil and allow the lubricating oil to flow to the bearing. The other eccentric positioning shaft assembly 80 is equipped with an exhaust valve 92 to meet the requirements of smooth injection of lubricating oil.

[0047] Furthermore, in this embodiment, such as Figure 6 As shown, the bearing sleeve 40 has a lubrication oil passage 46 that connects to the second positioning hole 44, thereby enabling lubricating oil to be supplied to other bearings between the bearing sleeve 40 and the sealing sleeve 30 via the lubrication oil passage 46. Optionally, the bearing sleeve 40 also has an exhaust passage that connects to the exhaust valve 92.

[0048] The internal spraying system for a non-retractable cutting section according to this utility model has a reasonable structural layout, good manufacturability, and is conducive to mass production. The water pump is equipped with a water supply channel and an oil channel. The water pump is installed inside the cutting head shaft, and a sealing sleeve is provided on the circumferential outer wall of the cutting head shaft. The sealing sleeve has a water inlet communicating with the water supply channel and an oil inlet and an oil return port communicating with the oil channel, respectively. The axis of the water pump is parallel to the axis of the cutting head shaft, or the axis of the water pump coincides with the axis of the cutting head shaft. A bearing sleeve is fitted on the circumferential outer wall of the sealing sleeve and is fitted with the sealing sleeve. The bearing sleeve rotates and fits together. The inner wall of the bearing sleeve forms a water inlet cavity communicating with the water inlet, an oil inlet cavity communicating with the oil inlet, and an oil return cavity communicating with the oil return cavity. The outer wall of the bearing sleeve is provided with a water inlet hole communicating with the water inlet cavity, an oil inlet hole communicating with the oil inlet cavity, and an oil return hole communicating with the oil return cavity. In this way, the channels opened on the bearing sleeve and the sealing sleeve can be used to enable the axis of the water pump in the non-telescopic cutting section to be parallel or coincident with the axis of the cutting head shaft. Compared with the radially installed water pump, the weakening of the structural strength of the cutting head shaft can be reduced and the service life of the cutting head shaft can be improved.

[0049] The second aspect of this invention provides a tunneling machine including an internal spray system for a non-telescopic cutting section as described above, thus having all the beneficial effects of an internal spray system for a non-telescopic cutting section, thereby improving the performance and service life of the tunneling machine.

[0050] 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. An internal spray system for a non-retractable cutting section, characterized in that, The internal spray system for the non-retractable cutting section includes: The water pump is equipped with a water supply channel and an oil channel; The cutting head shaft has a water pump installed inside it. A sealing sleeve is provided on the circumferential outer wall of the cutting head shaft. The sealing sleeve has a water inlet communicating with the water supply channel and an oil inlet and an oil return port communicating with the oil channel, respectively. The axis of the water pump is parallel to the axis of the cutting head shaft, or the axis of the water pump coincides with the axis of the cutting head shaft. A bearing sleeve is fitted onto the circumferential outer wall of the sealing sleeve and rotates with the sealing sleeve. The inner wall of the bearing sleeve forms a water inlet cavity communicating with the water inlet, an oil inlet cavity communicating with the oil inlet, and an oil return cavity communicating with the oil return cavity. The outer wall of the bearing sleeve is provided with a water inlet hole communicating with the water inlet cavity, an oil inlet hole communicating with the oil inlet cavity, and an oil return hole communicating with the oil return cavity.

2. The internal spray system for a non-retractable cutting section according to claim 1, characterized in that, The sealing sleeve and the cutting head shaft are formed as a separate structure. The cutting head shaft has connecting channels that connect the water inlet and the water supply channel, the oil channel and the oil inlet, and the oil channel and the oil return port, respectively. The inner wall of the sealing sleeve is provided with an annular groove for embedding the first sealing element. Multiple annular grooves are provided and are arranged at intervals along the axial direction of the sealing sleeve. The water inlet, the oil inlet and the oil return outlet are provided with annular grooves on both sides of the sealing sleeve in the axial direction.

3. The internal spray system for a non-retractable cutting section according to claim 2, characterized in that, The sealing sleeve is a ceramic component; Alternatively, the surface of the sealing sleeve may be provided with a ceramic layer.

4. The internal spray system for a non-retractable cutting section according to claim 1, characterized in that, The inner wall of the bearing sleeve is provided with a plurality of sealing parts arranged at intervals along the axial direction; in the axial direction of the bearing sleeve, the water inlet chamber, the oil inlet chamber and the oil return chamber are respectively arranged between two different and adjacent sealing parts.

5. The internal spray system for a non-retractable cutting section according to claim 4, characterized in that, The sealing part includes a receiving groove disposed on the inner wall of the bearing sleeve and a second sealing member embedded in the receiving groove, a portion of the second sealing member extending out of the receiving groove and contacting the circumferential outer wall of the sealing sleeve.

6. The internal spray system for a non-retractable cutting section according to claim 1, characterized in that, The internal spray system for the non-retractable cutting section also includes: A connector is installed on the outer wall of the bearing sleeve, and the connector has channels that communicate with the water inlet, the oil inlet and the oil return hole respectively.

7. The internal spray system for a non-retractable cutting section according to claim 1, characterized in that, The internal spray system for the non-retractable cutting section also includes: A protective sleeve is fitted onto the circumferential sidewall of the cutting head shaft; the bearing is fitted inside the protective sleeve.

8. The internal spray system for a non-retractable cutting section according to claim 7, characterized in that, The protective cylinder has a first positioning hole extending radially, and the outer wall of the bearing sleeve has a second positioning hole extending radially. The internal spray system for the non-retractable cutting section also includes: An eccentric positioning shaft assembly includes a first positioning member installed in the first positioning hole and a second positioning member installed in the second positioning hole, wherein the first positioning member is connected to the second positioning member.

9. The internal spray system for a non-retractable cutting section according to claim 8, characterized in that, A bearing is provided between the bearing sleeve and the sealing sleeve; The two eccentric positioning shaft assemblies are arranged opposite each other on both sides of the bearing sleeve in the radial direction, one of the eccentric positioning shaft assemblies is equipped with an oil injection nozzle, and the other eccentric positioning shaft assembly is equipped with an exhaust valve.

10. A tunneling machine, characterized in that, Includes the internal spray system for a non-retractable cutting section as described in any one of claims 1 to 9.

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