Main drive sealing system of heading machine

Abstract

The application discloses a main driving sealing system of a heading machine, which is connected at a heading end face of the main driving, and comprises a fixed ring, a rotating ring, a sealing sleeve connected to the outside of the fixed ring, an axial sealing cavity formed between the fixed ring and the rotating ring, an end face pressing ring connected to the fixed ring, a radial sealing cavity formed between the end face pressing ring and the rotating ring and communicated with the axial sealing cavity, and an end face sealing structure arranged in the radial sealing cavity and capable of moving along the axial direction of the main driving, and the end face sealing structure is capable of abutting against the end face pressing ring to seal the radial sealing cavity. The application can solve the problem that the compensation performance of the main driving sealing system is poor and the sealing performance of the whole sealing system is obviously reduced after wearing.

Description

Technical Field

[0001] This invention relates to the field of tunneling machine main drive sealing technology, and in particular to a tunneling machine main drive sealing system. Background Technology

[0002] The primary function of the main drive sealing system of a tunneling machine (TBM) is to protect the main bearing and prevent impurities in the cutterhead chamber from entering the drive box through the sealing cavity, thus preventing the TBM's transmission system from failing. Currently, the main drive sealing system mainly uses labyrinth seals, rubber seals, and continuous grease extrusion to prevent mud from entering the sealing cavity. However, the actual working conditions of a TBM during underground construction are quite complex. Due to external pressure and the pumping phenomenon of the sealing system, mud can easily enter the labyrinth cavity and the sealing cavity. Once mud enters, it is difficult to remove. Under the abrasive wear of the mud particles, the sealing structure loses its compensating performance, accelerating the failure of the sealing system and even causing damage and paralysis of the TBM's main bearing, resulting in incalculable economic losses. At the same time, continuous grease extrusion also incurs huge costs, and grease mixed with the excavated soil will also cause some environmental pollution. Summary of the Invention

[0003] The purpose of this invention is to provide a main drive sealing system for tunneling machines, which solves the problem that the current main drive sealing system has poor compensation performance and the sealing performance of the entire sealing system decreases significantly after wear.

[0004] The above-mentioned objectives of this invention are mainly achieved by the following technical solutions:

[0005] This invention provides a main drive sealing system for a tunneling machine, which is connected to the tunneling end face of the main drive. The main drive sealing system for the tunneling machine includes:

[0006] Retaining ring;

[0007] A rotating ring is sealed and fitted onto the outside of the fixed ring, and an axial sealing cavity is formed between the fixed ring and the rotating ring.

[0008] An end face pressure ring is connected to the fixed ring member. A radial sealing cavity is formed between the end face pressure ring and the rotating ring member, which communicates with the axial sealing cavity. An end face sealing structure that can move along the axial direction of the main drive is provided in the radial sealing cavity. The end face sealing structure can abut against the end face pressure ring to seal the radial sealing cavity.

[0009] In a preferred embodiment of the present invention, the rotating ring is provided with at least one pressure channel opposite to the end face sealing structure. A pressure control unit is externally connected to the pressure channel. The pressure control unit can apply pressure to the end face sealing structure through the pressure channel so that it seals against the end face pressure ring.

[0010] In a preferred embodiment of the present invention, an annular groove is formed on the end face of the rotating ring facing the radial sealing cavity, and the end face sealing structure is located in the annular groove; along the circumferential direction of the rotating ring, a plurality of piston holes are spaced apart at the bottom of the annular groove, and a piston that moves along the axial direction of the main drive is provided in the piston hole; there are a plurality of pressure channels, and each piston hole is connected to one of the pressure channels.

[0011] In a preferred embodiment of the present invention, the end face sealing structure includes an end face sealing ring and a top ring stacked together, the end face sealing ring being able to abut against the end face pressure ring, and the top ring abutting against the piston.

[0012] In a preferred embodiment of the present invention, a slag collection groove is provided on the side of the rotating ring facing the axial sealing cavity.

[0013] In a preferred embodiment of the present invention, along the circumferential direction of the rotating ring, a plurality of slag suction channels are spaced apart on the rotating ring and communicate with the slag collection trough, and the plurality of slag suction channels are connected to the suction unit.

[0014] In a preferred embodiment of the present invention, a barrier ring is connected to the side of the fixed ring facing the axial sealing cavity, a sealing element is provided between the fixed ring and the rotating ring, and the barrier ring is located between the slag collection groove and the sealing element.

[0015] In a preferred embodiment of the present invention, the rotating ring is provided with a grease injection channel, the grease injection channel is connected to the axial sealing cavity, and the outlet of the grease injection channel is disposed opposite to the barrier ring.

[0016] In a preferred embodiment of the present invention, the sealing element includes a first sealing ring, a sealing spacer ring, and a second sealing ring arranged sequentially adjacent to each other, wherein the sealing lips of the first sealing ring and the sealing lips of the second sealing ring face opposite directions.

[0017] In a preferred embodiment of the present invention, the sealing spacer ring is provided with an observation hole, and the rotating ring is provided with an observation channel communicating with the observation hole.

[0018] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0019] 1. The present invention uses an end-face sealing structure in the radial sealing chamber between the rotating ring and the end-face pressure ring to further seal the sealing cavity, which can effectively reduce the amount of grease squeezed out in the excavation chamber, avoid grease waste, and reduce the pollution of the squeezed grease to the environment.

[0020] 2. The end-face sealing structure in this invention includes an end-face sealing ring with radial compensation capability, which has a longer service life and better sealing effect.

[0021] 3. The slag collection groove of the axial sealing cavity can collect impurities and grease contained in the sealing cavity, and the mud and slag entering the sealing cavity can be discharged in time through the suction unit. This greatly reduces the damage of abrasive wear to the sealing structure, extends the service life of the sealing system, and improves the safety and reliability during the tunneling process. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0023] Figure 1 This is a cross-sectional structural diagram of the main drive sealing system of the tunneling machine according to the present invention;

[0024] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0025] Figure 3 This is a schematic cross-sectional view of the sealing ring described in this invention;

[0026] Figure 4 This is a schematic diagram of the overall structure of the sealing ring described in this invention.

[0027] Explanation of icon numbers:

[0028] 10. Main drive; 11. Inner ring; 12. Outer ring;

[0029] 20. Fixing ring; 21. Barrier ring;

[0030] 30. Rotating ring; 31. Sealing pressure ring; 311. Pressure channel; 312. Ring groove; 313. Piston hole; 314. Piston; 315. Slag suction channel; 316. Grease injection channel; 32. Sealing fixing ring; 321. Observation channel; 33. Slag collection tank; 34. Sealing element; 341. First sealing ring; 342. Sealing spacer ring; 343. Second sealing ring; 344. Observation hole;

[0031] 40. End face pressure ring;

[0032] 50. Axial sealing cavity; 51. Radial sealing cavity; 53. Sealing cavity outlet;

[0033] 60. End face sealing structure; 61. End face sealing ring; 62. Top ring;

[0034] 70. Pressure control unit; 71. Suction unit; 72. Grease pump;

[0035] X, axial direction; Y, radial direction. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0037] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] This invention provides a main drive sealing system for a tunneling machine, which is connected to the tunneling end face of the main drive 10. The main drive sealing system includes: a fixed ring 20; a rotating ring 30, which is sealed and sleeved on the outside of the fixed ring 20, and an axial sealing cavity 50 is formed between the fixed ring 20 and the rotating ring 30; and an end face pressure ring 40, which is connected to the fixed ring 20. A radial sealing cavity 51, which communicates with the axial sealing cavity 50, is formed between the end face pressure ring 40 and the rotating ring 30. The radial sealing cavity 51 is provided with an end face sealing structure 60 that can move along the axial direction X of the main drive 10. The end face sealing structure 60 can abut against the end face pressure ring 40 to seal the radial sealing cavity 51.

[0040] An end-face sealing structure 60 is provided within the radial sealing cavity 51 between the rotating ring 30 and the end-face pressure ring 40 to further seal the cavity, effectively reducing the amount of grease squeezed out of the excavation chamber, avoiding grease waste, and reducing environmental pollution from squeezed-out grease. The axially movable end-face sealing structure 60 has axial displacement compensation capability, enabling the end-face seal to maintain a good sealing effect for a long time and extending its service life.

[0041] Specifically, such as Figure 1 As shown, the sealing system of the tunneling machine described in this invention is located at the tunneling end face of the main drive 10. The main drive 10 of the tunneling machine has an inner ring 11 and an outer ring 12 that are sleeved together, and the inner ring 11 and the outer ring 12 are rotatably connected by bearings. The fixed ring 20 is fixed to the end face of the inner ring 11 by double-ended studs, and the rotating ring 30 is fixed to the end face of the outer ring 12 by double-ended studs. The rotating ring 30 includes a sealing fixed ring 32 and a sealing pressure ring 31 stacked together. The end face of the sealing fixed ring 32 is in contact with the end face of the outer ring 12; and both the sealing fixed ring 32 and the sealing pressure ring 31 are sleeved on the outside of the fixed ring 20.

[0042] An axial sealing cavity 50 extending in the axial direction X of the main drive 10 of the tunneling machine is formed between the inner side of the sealing ring 32 and the outer side of the fixing ring 20, and between the inner side of the sealing pressure ring 31 and the inner side of the fixing ring 20. An end face pressure ring 40 is fixed on the end face of the fixing ring 20 away from the inner ring 11. The double-ended stud used to fix the fixing ring 20 can simultaneously fix the end face pressure ring 40 on the fixing ring 20. The radial dimension of the end face pressure ring 40 is larger than the radial dimension of the fixing ring 20. Therefore, the end face pressure ring 40 can cover the sealing pressure ring 31, thereby forming a radial sealing cavity 51 extending in the radial direction Y of the main drive 10 between the front end face of the sealing pressure ring 31 and the rear end face of the end face pressure ring 40. The radial sealing cavity 51 is connected to the axial sealing cavity 50, and a sealing cavity outlet 53 is formed at the outlet of the radial sealing cavity 51.

[0043] Furthermore, the main drive sealing system of the tunneling machine described in this invention has an end face sealing structure 60 provided in the radial sealing cavity 51. This end face sealing structure 60 is disposed on the end face of the sealing ring 31 near the radial sealing cavity 51, and abuts against the end face of the end face ring 40 near the radial sealing cavity 51, thereby achieving sealing of the radial sealing cavity 51. Simultaneously, the end face sealing structure 60 can move along the axial direction X of the main drive 10, thereby adjusting the pressure between the end face sealing structure 60 and the end face ring 40. Therefore, even after the end face sealing structure 60 wears out after prolonged use, the axial displacement adjustment can still ensure a certain pressure between the end face sealing structure 60 and the end face ring 40, maintaining the sealing effect of the radial sealing cavity 51 in a superior state for a long time.

[0044] According to one embodiment of the present invention, such as Figure 1 As shown, the rotating ring 30 has at least one pressure channel 311 opposite to the end face sealing structure 60. A pressure control unit 70 is connected to the pressure channel 311. The pressure control unit 70 can apply pressure to the end face sealing structure 60 through the pressure channel 311 so that it seals against the end face pressure ring 40. The pressure control unit 70 can apply axial pressure X to the end face sealing structure 60 to ensure the stability of the sealing effect in the radial sealing cavity 51.

[0045] Specifically, such as Figure 1 As shown, the pressure channel 311 is located inside the sealing ring 31. It includes an axial channel opposite to the end face sealing structure 60 and a radial channel connected to the axial channel. The radial channel forms a pressure outlet on the outer surface of the sealing ring 31, and the pressure outlet is connected to a pressure control unit 70 via a pipe. The pressure control unit 70 can introduce gas or liquid with a certain pressure into the pressure channel 311, thereby acting on the end face sealing structure 60 to form a certain pressure between it and the sealing ring 31, maintaining a good end face sealing effect. At the same time, the pressure control unit 70 can adjust the pressure of the gas or liquid in the pressure channel 311 in real time according to the state of the oil squeezed out at the sealing cavity outlet 53.

[0046] Preferably, along the circumferential direction of the sealing ring 31, a plurality of pressure channels 311 are provided in the sealing ring 31 at intervals, and each pressure channel 311 is connected to the pressure control unit 70; the plurality of pressure channels 311 can make the annular end face sealing structure 60 uniformly stressed in the circumferential direction, ensuring that a good sealing effect is maintained in the entire annular space of the radial sealing cavity 51.

[0047] According to one embodiment of the present invention, such as Figures 1 to 4 As shown, an annular groove 312 is provided on the end face of the rotating ring 30 facing the radial sealing cavity 51, and the end face sealing structure 60 is located in the annular groove 312. Along the circumferential direction of the rotating ring 30, a plurality of piston holes 313 are provided at intervals at the bottom of the annular groove 312. A piston 314 that moves along the axial direction X of the main drive 10 is provided in the piston hole 313. There are multiple pressure channels 311, and each piston hole 313 is connected to a pressure channel 311.

[0048] Specifically, such as Figure 2 and Figure 3As shown, an annular groove 312 is formed on the end face of the sealing ring 31 facing the radial sealing cavity 51, and the end face sealing structure 60 is movably installed in the annular groove 312. Along the circumferential direction of the sealing ring 31, a plurality of piston holes 313 are spaced apart at the bottom of the annular groove 312. The position of each piston hole 313 corresponds to the position of the pressure channel 311 and is connected to the pressure channel 311. A piston 314 is sealed and installed in the piston hole 313.

[0049] The gas or liquid in the pressure channel 311 can apply pressure to the piston 314, pushing the piston 314 toward the end face sealing structure 60, thereby pushing the end face sealing structure 60 against the end face pressure ring 40 to achieve the sealing of the radial sealing cavity 51.

[0050] According to one embodiment of the present invention, such as Figure 2 As shown, the end-face sealing structure 60 includes a stacked end-face sealing ring 61 and a top ring 62. The end-face sealing ring 61 abuts against the end-face pressure ring 40, and the top ring 62 abuts against the piston 314. The end-face sealing ring 61 is usually made of a material with a certain degree of elasticity, so the piston 314, which is spaced apart, cannot easily apply the axial thrust in the X direction to the entire end-face sealing ring 61. A top ring 62 made of a rigid material is provided at one end of the end-face sealing ring 61 near the piston 314, through which the axial thrust of the piston 314 can be applied to the entire end-face sealing ring 61.

[0051] According to one embodiment of the present invention, as shown in Figure 1, a slag collection groove 33 is provided on the side of the rotating ring 30 facing the axial sealing cavity 50. During the tunneling operation of the tunneling machine, when a certain amount of slag enters the axial sealing cavity 50, as the slag continuously increases in the axial sealing cavity 50, it will cause wear on the entire sealing structure of the axial sealing cavity 50. Therefore, the sealing system of the present invention is provided with a slag collection groove 33 facing the axial sealing cavity 50, which can collect and store the slag in the axial sealing cavity 50.

[0052] Specifically, such as Figure 1 As shown, in this embodiment, the slag collection groove 33 is formed on the inner side of the sealing ring 31. It is an annular groove formed on the inner side of the sealing ring 31. After the mud enters the axial sealing cavity 50 and mixes with the grease, the sealing ring 31 rotates relative to the fixed ring 20, which in turn drives the grease in the axial sealing cavity 50 to rotate. Under the action of centrifugal force, the mud will preferentially enter the slag collection groove 33.

[0053] Furthermore, such as Figure 1As shown, along the circumferential direction of the rotating ring 30, multiple suction channels 315 connected to the slag collection tank 33 are spaced apart on the rotating ring 30. The multiple suction channels 315 are connected to the suction unit 71. The suction unit 71 periodically extracts the mud and slag in the slag collection tank 33 through the suction channels 315 to prevent the amount of mud and slag in the slag collection tank 33 from becoming too large and accumulating in the axial sealing cavity 50.

[0054] When the sludge in the sludge collection tank 33 is being pumped out, the pressure control unit 70 increases the pressure between the end face sealing ring 61 and the end face pressure ring 40 to completely isolate the axial sealing cavity 50 from the outside space, thus preventing the sludge from the outside from being sucked into the axial sealing cavity 50 through the sealing cavity outlet 53 during the pumping process.

[0055] According to one embodiment of the present invention, such as Figure 1 As shown, a barrier ring 21 is connected to the side of the fixed ring 20 facing the axial sealing cavity 50. A sealing element 34 is provided between the fixed ring 20 and the rotating ring 30. The barrier ring 21 is located between the sludge collection groove 33 and the sealing element 34. The barrier ring 21 can prevent the mud and sludge in the axial sealing cavity 50 from approaching the sealing element 34, thereby causing wear on the sealing element 34.

[0056] Specifically, such as Figure 1 As shown, a sealing element 34 is provided between the sealing ring 32 and the fixing ring 20. The sealing element 34 can seal the axial sealing cavity 50 and prevent mud and sludge from entering the main drive 10. The sealing element 34 includes a first sealing ring 341, a sealing spacer ring 342, and a second sealing ring 343 arranged sequentially adjacent to each other. The sealing lip of the first sealing ring 341 faces opposite directions to the sealing lip of the second sealing ring 343.

[0057] like Figure 1 As shown, a barrier ring 21 is provided between the slag collection trough 33 and the first sealing ring 341. The barrier ring 21 is fixed on the outer surface of the fixing ring 20. In this embodiment, the barrier ring 21 is made of metal and is spliced ​​together from multiple arc segments. It is fixed in a pre-drilled groove on the fixing ring 20 by screws. Of course, in other embodiments, the barrier ring 21 can be integrally machined from an elastic material and fixed on the outer surface of the fixing ring 20 by snap-fit ​​or adhesive. As long as it can form a certain barrier effect on the sludge between the slag collection trough 33 and the first sealing ring 341, it is acceptable.

[0058] According to one embodiment of the present invention, such as Figure 1 As shown, the rotating ring 30 has a grease injection channel 316, which is connected to the axial sealing cavity 50, and the outlet of the grease injection channel 316 is opposite to the barrier ring 21.

[0059] Specifically, the grease injection channel 316 is located inside the sealing ring 31. A grease injection inlet is formed on the outer surface of the sealing ring 316, and this inlet is connected to the grease pump 72 via a pipe. The grease injection channel 316 continuously supplies grease into the axial sealing cavity 50. Since the grease injection channel 316 faces the outlet of the axial sealing cavity 50 and corresponds to the barrier ring 21, the grease on the side of the barrier ring 21 facing the slag collection tank 33 tends to flow towards the slag collection tank 33. The sludge, after entering this area, will backflow and then enter the slag collection tank 33 under centrifugal force.

[0060] Preferably, a plurality of grease injection channels 316 are provided at intervals inside the sealing ring 31 along the circumferential direction of the sealing ring 31.

[0061] According to one embodiment of the present invention, the sealing spacer 342 is provided with an observation hole 344, and the rotating ring 30 is provided with an observation channel 321 communicating with the observation hole 344. The sealing status between the first sealing ring 341 and the second sealing ring 343 can be monitored in real time through the observation hole 344 and the observation channel 321.

[0062] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A main drive sealing system for a tunneling machine, characterized in that, The tunneling machine main drive sealing system, connected to the tunneling end face of the main drive (10), includes: Retaining ring (20); A rotating ring (30) is sealed and fitted onto the outside of the fixed ring (20), and an axial sealing cavity (50) is formed between the fixed ring (20) and the rotating ring (30). An end face pressure ring (40) is connected to the fixed ring (20). A radial sealing cavity (51) communicating with the axial sealing cavity (50) is formed between the end face pressure ring (40) and the rotating ring (30). An end face sealing structure (60) that can move along the axial direction (X) of the main drive (10) is provided in the radial sealing cavity (51). The end face sealing structure (60) can abut against the end face pressure ring (40) to seal the radial sealing cavity (51). The rotating ring (30) has at least one pressure channel (311) opposite to the end face sealing structure (60). The pressure channel (311) is externally connected to a pressure control unit (70). The pressure control unit (70) can apply pressure to the end face sealing structure (60) through the pressure channel (311) so that it seals against the end face pressure ring (40). The rotating ring (30) has an annular groove (312) on its end face facing the radial sealing cavity (51), and the end face sealing structure (60) is located in the annular groove (312). Along the circumferential direction of the rotating ring (30), the bottom of the annular groove (312) is provided with a plurality of piston holes (313) spaced apart. The piston holes (313) are provided with pistons (314) that move along the axial direction (X) of the main drive (10). There are a plurality of pressure channels (311), and each piston hole (313) is connected to one pressure channel (311).

2. The main drive sealing system for a tunneling machine according to claim 1, characterized in that, The end face sealing structure (60) includes an end face sealing ring (61) and a top ring (62) stacked together. The end face sealing ring (61) can abut against the end face pressure ring (40), and the top ring (62) abuts against the piston (314).

3. The main drive sealing system for a tunneling machine according to any one of claims 1-2, characterized in that, The rotating ring (30) has a slag collection groove (33) on its side facing the axial sealing cavity (50).

4. The main drive sealing system for a tunneling machine according to claim 3, characterized in that, Along the circumferential direction of the rotating ring (30), a plurality of slag suction channels (315) are provided on the rotating ring (30) at intervals and connected to the slag collection tank (33). The plurality of slag suction channels (315) are connected to the suction unit (71).

5. The main drive sealing system for a tunneling machine according to claim 3, characterized in that, A barrier ring (21) is connected to the side of the fixed ring (20) facing the axial sealing cavity (50). A seal (34) is provided between the fixed ring (20) and the rotating ring (30). The barrier ring (21) is located between the slag collection groove (33) and the seal (34).

6. The main drive sealing system for a tunneling machine according to claim 5, characterized in that, The rotating ring (30) is provided with a grease injection channel (316), which is connected to the axial sealing cavity (50), and the outlet of the grease injection channel (316) is opposite to the barrier ring (21).

7. The tunneling machine main drive sealing system according to claim 6, characterized in that, The sealing element (34) includes a first sealing ring (341), a sealing spacer (342), and a second sealing ring (343) arranged sequentially adjacent to each other, with the sealing lips of the first sealing ring (341) and the sealing lips of the second sealing ring (343) facing opposite directions.

8. The main drive sealing system for a tunneling machine according to claim 7, characterized in that, The sealing ring (342) is provided with an observation hole (344), and the rotating ring (30) is provided with an observation channel (321) that communicates with the observation hole (344).

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