A sliding bearing hob for a tunneling machine

Abstract

The utility model discloses a kind of sliding bearing hob of shield machine, belong to the field of shield machine.A kind of sliding bearing hob of shield machine, including tool shaft, the inside transverse of tool shaft is provided with main transmission pipeline, the both sides of main transmission pipeline outside are respectively surrounded with second shunt pipeline and first shunt pipeline.The utility model solves the problem that high-power grease injection pump increases equipment cost and energy consumption in the process of using existing hob, the utility model first alternately distributed second shunt pipeline and first shunt pipeline can be evenly distributed after the uniform distribution of lubricating grease transmission, first shunt pipeline and second shunt pipeline adopt tapering pipeline, using fluid dynamics principle, obtain higher flow rate and better permeability in first oil inlet position, adjust the included angle between first shunt pipeline and second shunt pipeline and main transmission pipeline, reduce included angle value can avoid lubricating grease due to viscosity extremely high.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machines, specifically a sliding bearing cutterhead for tunnel boring machines. Background Technology

[0002] The cutterhead of a tunnel boring machine (TBM) is a key rock-breaking cutter installed on the cutterhead of the TBM. It is mainly used to break hard rock in front of the tunnel. Its core is a disc-shaped cutter with a high-strength cemented carbide cutter ring. Driven by the rotation of the cutterhead, it rolls and crushes the rock under the action of strong thrust. The cutterhead is usually installed in groups on the outer edge and front area of ​​the cutterhead. It is the main cutter for tunneling in hard rock formations. Its rock-breaking principle is to use the huge thrust and the rolling pressure generated by rotation to cause shear or tensile failure of the rock. The cutterhead directly bears the reaction force of the rock.

[0003] Chinese patent CN202187769U discloses a tunnel boring machine cutterhead with a novel oil injection structure, including a cutter shaft with an oil injection hole extending from its end to the inner cavity of the cutterhead. An oil cavity plug is provided at the end of the cutter shaft. Lubricating oil or grease is injected from the hole at the end of the cutter shaft and delivered to the inner cavity of the cutterhead. The hole is then sealed with the oil cavity plug. Because the cutter shaft has a relatively regular shape, drilling and tapping on the cutter shaft are easy to achieve, giving it the advantages of simple structure and convenient processing.

[0004] In order to meet the lubrication requirements during use, the aforementioned patented hobbing cutter uses a horizontal channel to transmit grease. However, the angle between the vertical and horizontal channels is relatively large. Grease is a non-Newtonian fluid with extremely high viscosity and poor flowability. When it flows in the pipeline, it will generate huge local pressure loss when it encounters a large angle. This results in a relatively high power requirement for the grease pump when delivering grease. The high-power grease pump increases equipment cost and energy consumption. Under high pressure, it also increases the risk of failure of the sealing link. In addition, the two vertical channels have a fixed transmission direction, which cannot deliver grease and uniformly meet the lubrication requirements. Utility Model Content

[0005] The purpose of this invention is to provide a sliding bearing cutterhead for a tunnel boring machine. Firstly, the alternating distribution of the second and first branch pipes facilitates the uniform distribution of grease after transmission. Secondly, the first and second branch pipes adopt a tapered design, utilizing fluid dynamics principles to achieve higher flow velocity and better permeability at the first oil injection port. Adjusting the angle between the first and second branch pipes and the main transmission pipe, and reducing the angle value, avoids the need for a relatively high power grease pump when delivering grease due to its extremely high viscosity. This solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sliding bearing cutterhead for a tunnel boring machine, comprising a cutter shaft, a main transmission pipe arranged laterally inside the cutter shaft, and a second diversion pipe and a first diversion pipe respectively arranged around the outer sides of the main transmission pipe. The first and second diversion pipes are tapered pipes, and the larger diameter ends of the first and second diversion pipes are sealed to the main transmission pipe. A filter element is arranged inside the main transmission pipe. Three of each of the first and second diversion pipes are arranged around the main transmission pipe. The first and second diversion pipes can improve the grease transmission speed while increasing the uniformity of grease discharge, making it easier for the grease to evenly contact the lubrication position.

[0007] Preferably, the three first diversion pipes and the three second diversion pipes are alternately distributed, and the alternating distribution of the first and second diversion pipes can facilitate the uniform transmission of grease.

[0008] Preferably, a second oil inlet is provided at one end of the main transmission pipeline, and a core valve is provided on one side inside the second oil inlet. The core valve can be used to fill the second oil inlet after the grease is injected.

[0009] Preferably, the angle between the first and second branch pipes and the main transmission pipe is 45 degrees. Reducing the angle between the first and second branch pipes and the main transmission pipe facilitates the delivery and transmission of lubricating grease.

[0010] Preferably, the filter element is a sintered metal filter element, which facilitates the filtration of lubricating grease during delivery.

[0011] Preferably, tool hubs are provided on both sides of the cutter shaft. A first graphite copper sleeve is provided on the side of the tool hub facing the cutter shaft, and a second graphite copper sleeve is provided on the other side of the tool hub facing the cutter shaft. A first oil inlet is provided between the second graphite copper sleeve and the first graphite copper sleeve. The first oil inlet is sealed and connected to the first and second diversion pipes respectively. The tool hubs facilitate the installation and use of the tool ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention features a second diversion pipe surrounding one of the first oil inlets on the outside of the main transmission pipeline, and a first diversion pipe surrounding the other. The alternating distribution of the second and first diversion pipes facilitates the uniform distribution of grease after transmission. Furthermore, the first and second diversion pipes are tapered, increasing the discharge speed of the grease at the first oil inlet after transmission and diversion by these pipes. This utilizes fluid dynamics principles to achieve higher flow rates and better penetration at the first oil inlet, ensuring the grease can penetrate the pores of the first and second graphite copper sleeves. Additionally, adjusting the inclination trajectory of the first and second diversion pipes and the angle between them and the main transmission pipeline reduces the angle, preventing the high viscosity of the grease from requiring a high-power grease pump during delivery, thus avoiding increased equipment costs and energy consumption. Attached Figure Description

[0014] Figure 1 This is a side view showing the positional relationship of the buckle in this utility model;

[0015] Figure 2 This is a cross-sectional view of the internal structure of the main transmission pipeline of this utility model;

[0016] Figure 3 For the present utility model Figure 2 Enlarged view of a portion of region A in the middle;

[0017] Figure 4 For the present utility model Figure 2 Enlarged view of a portion of region B in the middle;

[0018] Figure 5 For the present utility model Figure 2 Enlarged view of a portion of region C in the middle;

[0019] Figure 6 This is a schematic diagram of the grease transmission trajectory in the main transmission pipeline of this utility model;

[0020] Figure 7 This is a schematic diagram showing the positional relationship between the first and second diversion pipes of this utility model.

[0021] In the diagram: 1. Cutter shaft; 2. End cap; 3. Cutter hub; 4. Cutter ring; 5. Gasket; 6. Core valve; 7. First floating seal; 8. First graphite copper sleeve; 9. Second graphite copper sleeve; 10. First oil inlet; 11. First diversion pipe; 12. Main transmission pipe; 13. Filter element; 14. Second floating seal; 15. Second diversion pipe; 16. Limiting cover; 17. Buckle; 18. Second oil inlet. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments.

[0023] like Figure 1 and Figure 2 As shown, a sliding bearing cutterhead for a tunnel boring machine in this embodiment includes a cutter shaft 1, and cutter hubs 3 are provided on both sides of the cutter shaft 1. A first graphite copper sleeve 8 is provided on the side of the cutter hub 3 facing the cutter shaft 1, and a second graphite copper sleeve 9 is provided on the other side of the cutter hub 3 facing the cutter shaft 1. The second graphite copper sleeve 9 and the first graphite copper sleeve 8 can assist the rotation of the cutter hub 3 and the use of the tunnel boring machine.

[0024] The core advantage of graphite copper sleeves lies in their extremely high load-bearing capacity, enabling them to adapt to the continuous operation of tunnel boring machines in complex, variable, and high-impact underground environments for extended periods. The bearing surfaces of the first graphite copper sleeve 8 and the second graphite copper sleeve 9 are in surface contact, rather than the point or line contact of rolling bearings. This means that the load is evenly distributed over a larger area. During tunnel boring, the cutter hub 3 and cutter ring 4 bear enormous thrust and radial loads, especially when breaking hard rock strata. The first graphite copper sleeve 8 and the second graphite copper sleeve 9 can better withstand these extremely high static and dynamic loads, avoiding premature failure due to excessive contact stress.

[0025] To facilitate the sealing of the grease between the second graphite copper sleeve 9 and the first graphite copper sleeve 8, and to prevent external foreign objects from entering and affecting their use, a first floating seal 7 is provided on both sides between the tool hub 3 and the tool shaft 1. A second floating seal 14 is provided between the two first floating seals 7. The second floating seal 14 and the first floating seal 7 can effectively protect the grease between the second graphite copper sleeve 9 and the first graphite copper sleeve 8, preventing external foreign objects from affecting their use and lubrication.

[0026] When subjected to severe impacts and vibrations, the second graphite copper sleeve 9 and the first graphite copper sleeve 8, which are in surface contact, have a more uniform stress distribution and do not generate stress concentration between the rollers and raceways like rolling bearings. When the geological conditions are uneven, the second graphite copper sleeve 9 and the first graphite copper sleeve 8 themselves, based on lubrication, can effectively absorb and buffer these impacts, exhibiting higher reliability and longer service life.

[0027] Furthermore, a main transmission pipe 12 is laterally arranged inside the cutter shaft 1, and a second branch pipe 15 is arranged around one side of the outside of the main transmission pipe 12, such as... Figure 4 As shown, a first diversion pipe 11 is arranged around the other side of the main transmission pipe 12. The first diversion pipe 11 and the second diversion pipe 15 can facilitate the diversion and transmission of grease, and facilitate the grease to contact the second graphite copper sleeve 9 and the first graphite copper sleeve 8 evenly.

[0028] It is worth mentioning that the first diversion pipe 11 and the second diversion pipe 15 are tapered pipes. A first oil inlet 10 is provided between the second graphite copper sleeve 9 and the first graphite copper sleeve 8. The first oil inlet 10 is sealed to the first diversion pipe 11 and the second diversion pipe 15 respectively. The tapered pipes of the first diversion pipe 11 and the second diversion pipe 15 can increase the discharge speed of the grease after diverting the grease. The larger diameter end of the first diversion pipe 11 and the second diversion pipe 15 is sealed to the main transmission pipe 12 to ensure that the grease can break through the gaps of the second graphite copper sleeve 9 and the first graphite copper sleeve 8, which facilitates the lubrication inside the cutter head. The second graphite copper sleeve 9 and the first graphite copper sleeve 8 are themselves sleeves with a very simple structure, which can be installed in a limited space, especially suitable for small diameter tunnel boring machines, and can also reduce the filling of grease.

[0029] It is worth mentioning that the second graphite copper sleeve 9 and the first graphite copper sleeve 8 are easier to seal. Since there are no rolling elements that require a cage, their installation positions can be designed to be smaller and more compact. Excellent sealing is the key to ensuring bearing life. The sealing structure of the second graphite copper sleeve 9 and the first graphite copper sleeve 8 can more effectively prevent contaminants from entering the bearing and protect the cleanliness of the grease. This is the fundamental premise for achieving a long service life.

[0030] To filter the grease and prevent foreign matter in the grease from affecting the use of the second graphite copper sleeve 9 and the first graphite copper sleeve 8, such as... Figure 5 As shown, a filter element 13 is provided inside the main transmission pipe 12. The reserved filter element 13 can filter the grease when it is transmitted and sent into the first diversion pipe 11. At the same time, it can also filter the grease to prevent the grease from flowing out from the first diversion pipe 11, so that the grease can continuously wrap around and remain around the second graphite copper sleeve 9 and the first graphite copper sleeve 8.

[0031] The filter element 13 is a sintered metal filter element. The sintered metal filter element can directly filter the transmitted grease. The filter element 13 can cover the position where the grease flows into the first diversion pipe 11 and the second diversion pipe 15, which facilitates the delivery and filtration of grease.

[0032] like Figure 6 and Figure 7 As shown, in order to ensure that the grease can be evenly distributed around the second graphite copper sleeve 9 and the first graphite copper sleeve 8, three first diversion pipes 11 and two second diversion pipes 15 are arranged around the main transmission pipe 12. The three first diversion pipes 11 and the three second diversion pipes 15 are alternately distributed, which can ensure that the grease can be evenly delivered and improve the lubrication effect.

[0033] By actively filling the lubricant, the internal lubricant can assist the rotation of the second graphite copper sleeve 9 and the first graphite copper sleeve 8, reduce the friction between the second graphite copper sleeve 9 and the first graphite copper sleeve 8, and further improve the service life and stability of the entire tunnel boring machine sliding bearing cutter.

[0034] like Figure 3 As shown, a second oil inlet 18 is provided at one end of the main transmission pipeline 12. In order to prevent the grease from being exposed during actual use, a core valve 6 is provided on one side of the inside of the second oil inlet 18, and a limit cover 16 is provided on the other side of the inside of the second oil inlet 18. A buckle 17 is provided on the other side of the limit cover 16. After the grease is injected, the core valve 6, the limit cover 16 and the buckle 17 are installed in sequence inside the second oil inlet 18 to complete the sealing of the second oil inlet 18.

[0035] To prevent grease from getting stuck at the bend between the first branch pipe 11 and the second branch pipe 15 and the main transmission pipe 12, the angle between the first branch pipe 11 and the second branch pipe 15 and the main transmission pipe 12 is 45 degrees. Reducing the angle facilitates the transmission of grease, allowing it to be diverted and transmitted from the first branch pipe 11 and the second branch pipe 15.

[0036] Both sides of the first floating seal 7 are provided with end caps 2. The end caps 2 can wrap and protect the position of the first floating seal 7. A gasket 5 is provided on the outside of the end cap 2 facing the cutter shaft 1. A cutter ring 4 is provided on one side of the outside of the cutter hub 3. The cutter hub 3 facilitates the use of the cutter ring 4.

[0037] Working principle: When using a bearing hob and lubricating it, grease is injected through the second oil inlet 18 of the main transmission pipe 12. The injected grease is transported along the main transmission pipe 12, and after being filtered by the filter element 13, it is transported towards the first branch pipe 11 and the second branch pipe 15. The grease transported by the first branch pipe 11 and the second branch pipe 15 directly delivers the grease to the first oil inlet 10 on both sides of the cutter shaft 1. The first branch pipe 11 and the second branch pipe 15 are tapered pipes. The connection position between the main transmission pipe 12 and the first branch pipe 11 and the second branch pipe 15 is... The diameter is larger than the connection position between the first diversion pipe 11 and the second diversion pipe 15 and the first oil injection port 10. Utilizing the principle of fluid dynamics, a higher flow rate and better permeability are obtained at the first oil injection port 10 position, ensuring that the grease can break through the pores of the graphite copper sleeve. After the grease is evenly replenished along the first diversion pipe 11 and the second diversion pipe 15 to the area around the first graphite copper sleeve 8 and the second graphite copper sleeve 9, the core valve 6, the limit cover 16 and the buckle 17 are filled in sequence to complete the sealing of the position of the main transmission pipe 12. Subsequently, the position of the cutter shaft 1 is used as the connection position. After the cutter shaft 1 is connected to the shield machine installation position, the cutter ring 4 is fixed to realize the subsequent drilling.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A sliding bearing cutterhead for a tunnel boring machine, comprising a cutter shaft (1), characterized in that, The cutter shaft (1) has a main transmission pipe (12) arranged horizontally inside. The main transmission pipe (12) has a second diversion pipe (15) and a first diversion pipe (11) arranged around its two sides. The first diversion pipe (11) and the second diversion pipe (15) are tapered pipes. The larger diameter end of the first diversion pipe (11) and the second diversion pipe (15) is sealed to the main transmission pipe (12). The main transmission pipe (12) has a filter element (13) inside. There are three of the first diversion pipe (11) and the second diversion pipe (15) arranged around the main transmission pipe (12).

2. The sliding bearing cutterhead of a tunnel boring machine according to claim 1, characterized in that, The three first diversion pipes (11) and the three second diversion pipes (15) are distributed alternately.

3. The sliding bearing cutterhead of a tunnel boring machine according to claim 1, characterized in that, A second oil inlet (18) is provided at one end of the main transmission pipeline (12), and a core valve (6) is provided on one side inside the second oil inlet (18).

4. The sliding bearing cutterhead of a tunnel boring machine according to claim 2, characterized in that, The angle between the first diversion pipe (11) and the second diversion pipe (15) and the main transmission pipe (12) is 45 degrees.

5. A sliding bearing cutterhead for a tunnel boring machine according to claim 1, characterized in that, The filter element (13) is a sintered metal filter element.

6. A sliding bearing cutterhead for a tunnel boring machine according to claim 1, characterized in that, Both sides of the cutter shaft (1) are provided with cutter hubs (3). A first graphite copper sleeve (8) is provided on the side of the cutter hub (3) facing the cutter shaft (1), and a second graphite copper sleeve (9) is provided on the other side of the cutter hub (3) facing the cutter shaft (1). A first oil inlet (10) is provided between the second graphite copper sleeve (9) and the first graphite copper sleeve (8). The first oil inlet (10) is sealed and connected to the first diversion pipe (11) and the second diversion pipe (15) respectively.

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