Main drive sealing pressure compensation system and method and heading machine

Abstract

The invention relates to a main drive sealing pressure compensation system and method and a heading machine. The main drive sealing pressure compensation system comprises a mounting box, a driving ring, a plurality of driving parts and a pressurizing device, the driving ring is rotatably and hermetically arranged in the first end of the mounting box through a sealing assembly, each driving part is hermetically connected with the mounting box through a sealing ring, and an output shaft of each driving part extends into the mounting box and is connected with the driving ring through a transmission structure; a first closed chamber is formed in the mounting box and is positioned in an area between the sealing assembly and each sealing ring; a pressure sealing cover is further arranged outside each driving piece in a covering mode, and a second closed cavity is formed in the area between each pressure sealing cover and the mounting box and the area between the sealing ring and the outer side wall of the driving piece; and the pressurizing device can pressurize the first closed chamber and / or the second closed chamber. The problem that normal tunneling of the tunneling machine is affected due to the fact that the pressure bearing capacity of an existing main drive seal cannot meet the ultrahigh water pressure stratum can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of tunnel construction equipment, and in particular to a main drive seal pressure compensation system, method and tunnel boring machine. Background Art

[0002] With the advancement of science and technology, the construction of urban rail transit has flourished, and the shield method has been used more and more widely. For cross-river and cross-sea tunnels and tunnels with complex geological conditions, higher requirements are placed on the sealing system of the shield machine.

[0003] The main drive seal is one of the most critical components of the shield machine. Its function is to prevent mud from entering the main bearing and prevent the main bearing lubricating gear oil from leaking out of the main drive gear cavity. It is a barrier to protect the main bearing. The reliability of the shield machine's main drive seal is the key to the normal excavation of the shield machine. The sealing system should meet the requirements of mud and water pressure, groundwater pressure, additive injection pressure and air pressure in the soil bin. For ultra-high water pressure formations, the main drive seal is under great pressure. To prevent mud from entering the main drive system of the shield machine, higher requirements are placed on the sealing structure, but the pressure bearing capacity of existing seals cannot meet the requirements of ultra-high water pressure formations.

[0004] In recent years, relevant research has been conducted to address the problem of insufficient performance of the main drive seal under high water pressure. For example, the pressure-bearing capacity of the main drive seal is improved by controlling the pressure of the grease chamber in the seal and pressurizing the drive box to compensate for the pressure on the back of the seal. However, due to the limited pressure-bearing capacity of the reducer seal, the ability of the drive box to pressurize is limited, and there are still certain restrictions on the control of pressure, which cannot achieve full adaptability to high-pressure formations. Therefore, it is necessary to design a main drive sealing system with a wide range of applications and strong pressure-bearing capacity. Summary of the invention

[0005] The purpose of the present invention is to provide a main drive seal pressure compensation system, method and tunnel boring machine, which can effectively solve the problem that the pressure bearing capacity of the existing main drive seal cannot meet the ultra-high water pressure formation and affects the normal tunneling of the tunnel boring machine.

[0006] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0007] The present invention provides a main drive seal pressure compensation system, comprising an installation box, a drive ring, a plurality of drive members and a pressurizing device; the drive ring is rotatably and sealably arranged in the first end of the installation box through a sealing assembly, and a plurality of drive members are circumferentially spaced and fixedly arranged at the second end of the installation box, and each drive member is sealed and connected to the installation box through a sealing ring, and the output shaft of each drive member extends into the installation box and is connected to the drive ring through a transmission structure to drive the drive ring to rotate; a first closed chamber is formed in the installation box and in the area between the sealing assembly and each sealing ring; a pressure sealing cover is also provided outside each drive member, and the pressure sealing cover is fixedly connected to the second end of the installation box, and the area between each pressure sealing cover and the outer side wall of the installation box, the sealing ring and the drive member forms a second closed chamber; the pressurizing device is connected to the first closed chamber and the second closed chamber, and can pressurize the first closed chamber and / or the second closed chamber.

[0008] In a preferred embodiment of the present invention, a first pressure sensor is provided outside the first end of the installation box, a second pressure sensor is provided in the first closed chamber, and a third pressure sensor is provided in each second closed chamber. The main drive seal pressure compensation system also includes a controller, which is electrically connected to the first pressure sensor, the second pressure sensor, the third pressure sensor and the pressurizing device.

[0009] In a preferred embodiment of the present invention, the pressurizing device is connected to the first closed chamber through a first pipeline in a switchable manner, and is connected to multiple second closed chambers through multiple second pipelines respectively; a first switch valve is provided on the first pipeline, and a second switch valve is provided on the second pipeline, and the controller is also electrically connected to the first switch valve and the second switch valve.

[0010] In a preferred embodiment of the present invention, a main bearing is provided in the mounting box and between the drive ring and the driving member. The outer ring of the main bearing is fixedly connected to the mounting box. Gears are fixedly provided on the output shafts of the driving members. Each gear can mesh with the inner ring of the main bearing. The drive ring is fixedly connected to the inner ring of the main bearing.

[0011] In a preferred embodiment of the present invention, the mounting box includes a grease box and a drive box which are connected and communicated with each other, the grease box and the drive box are both annular box bodies, and a baffle is provided at the inner ring hole of the grease box and at the end position away from the drive box; the drive ring and the sealing assembly are both arranged in the grease box, the outer ring clamp of the main bearing is fixed between the grease box and the drive box, the drive member is fixedly connected to the drive box, and the output shaft of the drive member extends into the drive box, and the pressure sealing cover is fixedly connected to the drive box.

[0012] In a preferred embodiment of the present invention, the drive box includes a first mounting ring, a second mounting ring and a support ring arranged axially at intervals, the support ring is connected and fixed between the first mounting ring and the second mounting ring and close to the inner ring hole of the first mounting ring, the outer diameter of the second mounting ring is larger than the outer diameter of the first mounting ring; a plurality of mounting holes are circumferentially spaced apart on the second mounting ring, the driving member is inserted into the mounting holes and is sealed and connected by a sealing ring; a mounting shaft is connected to the output shaft of the driving member, the end of the mounting shaft is rotatably connected to the first mounting ring, and the gear sleeve is fixed on the mounting shaft; the main bearing sleeve is arranged outside the first mounting ring, and its two end faces are respectively pressed against the grease box and the end faces of the second mounting ring, and its outer ring is fixed to the grease box and the second mounting ring; the pressure sealing cover is fixed to the second mounting ring, and the driving member is fixed to the second mounting ring through a bracket.

[0013] In a preferred embodiment of the present invention, the grease box includes an inner grease ring and an outer grease ring which are arranged inside and outside, and the drive ring is installed in an annular accommodating cavity surrounded by the inner grease ring and the outer grease ring. The first end of the drive ring can extend out of the grease box and be used to connect the cutter head of the tunnel boring machine, and the second end can be fixedly connected to the inner ring of the main bearing; the outer grease ring is fixedly connected to the outer ring of the main bearing, and the inner grease ring is fixedly connected to the first mounting ring; the sealing assembly includes an outer sealing assembly arranged between the drive ring and the outer grease ring and an inner sealing assembly arranged between the drive ring and the inner grease ring.

[0014] In a preferred embodiment of the present invention, the driving member includes a rotating power mechanism and a reducer connected to each other, the reducer is sealed to the installation box via a sealing ring, and is fixed to the installation box via a bracket.

[0015] The present invention also provides a main drive seal pressure compensation method, wherein a first closed chamber is formed between a seal assembly on the periphery of a drive ring of a tunnel boring machine and a seal ring on the periphery of a drive member, and a pressure seal cover is provided on the outer cover of the drive member to form a second closed chamber between the pressure seal cover, the periphery of the drive member and the seal ring; the main drive seal pressure compensation method comprises:

[0016] Real-time detection of the pressure of the mud and water bin in front of the driving ring, the pressure in the first closed chamber, and the pressure in the second closed chamber;

[0017] Calculate the pressure difference between the mud and water bin and the first closed chamber and the pressure difference between the first closed chamber and the second closed chamber, and record them as the first pressure difference and the second pressure difference respectively;

[0018] Adjusting the pressures of the first sealed chamber and the second sealed chamber so that the first pressure difference is less than or equal to a first preset upper limit value, and the second pressure difference is less than or equal to a second preset upper limit value;

[0019] The first preset upper limit value is smaller than the pressure-bearing upper limit value of the sealing component, and the second preset upper limit value is smaller than the pressure-bearing upper limit value of the sealing ring.

[0020] In a preferred embodiment of the present invention, adjusting the pressure of the first sealed chamber and the second sealed chamber comprises:

[0021] When the pressure of the mud and water bin increases so that the first pressure difference exceeds the first preset upper limit value, the first closed chamber is pressurized until the first pressure difference is less than or equal to the first preset upper limit value;

[0022] When the first sealed chamber rises so that the second pressure difference exceeds the second preset upper limit, both the first sealed chamber and the second sealed chamber are pressurized simultaneously until the second pressure difference is less than or equal to the second preset upper limit, and the first pressure difference is less than or equal to the first preset upper limit.

[0023] The present invention also provides a tunnel boring machine, including a cutter disc, a shield body and the above-mentioned main drive seal pressure compensation system; the mounting box is fixedly arranged in the shield body, and the end of the drive ring can extend out of the first end of the mounting box and connect to the cutter disc to drive the cutter disc to rotate.

[0024] As described above, the present invention sets two closed chambers on the back of the sealing assembly. By dynamically adjusting the pressure in the two closed chambers, it can ensure that unlimited pressurization is achieved within the pressure range of the sealing assembly and the sealing ring to balance the water and soil pressure outside the first end of the installation box. Through two-stage pressure compensation, the effectiveness of the sealing assembly and the sealing ring under ultra-high pressure conditions can be achieved, ensuring that the tunnel boring machine can tunnel normally under ultra-high pressure conditions, and avoiding the risk of failure of the main drive sealing system under ultra-high pressure conditions. The present invention ensures stable, safe and economical construction without changing the existing main drive of the tunnel boring machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0026] in:

[0027] Figure 1 A partial structural schematic diagram of the tunnel boring machine provided by the present invention.

[0028] Figure 2 for Figure 1 A partial enlargement of the figure.

[0029] Description of Figure Numbers:

[0030] 100. Main drive seal pressure compensation system;

[0031] 11. Rotating power mechanism; 12. Speed ​​reducer; 121. Sealing ring; 122. Mounting shaft; 123. End bearing; 124. Bracket; 13. Gear;

[0032] 2. Main bearing;

[0033] 3. Driving ring;

[0034] 4. Sealing assembly; 41. External sealing assembly; 42. Internal sealing assembly;

[0035] 5. drive box; 51. first mounting ring; 52. second mounting ring; 53. support ring;

[0036] 6. Grease box; 61. Outer grease ring; 611. First limiting ring; 62. Inner grease ring; 621. Pressing ring; 6211. Second limiting ring; 622. Inner ring body; 63. Baffle;

[0037] 7. Pressure sealing cover;

[0038] 81. first sealed chamber; 82. second sealed chamber;

[0039] 200. Shield;

[0040] 300, knife disc;

[0041] 400. Mud and water tank. DETAILED DESCRIPTION

[0042] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0043] like Figure 1 and Figure 2 As shown, the present application provides a main drive seal pressure compensation system 100, including an installation box, a drive ring 3, a plurality of drive members and a pressurizing device; the drive ring 3 is rotatably and sealably arranged in the first end of the installation box through a sealing assembly 4, and a plurality of drive members are circumferentially spaced and fixedly arranged at the second end of the installation box, and each drive member is sealed and connected to the installation box through a sealing ring 121, and the output shaft of each drive member extends into the installation box and is connected to the drive ring 3 through a transmission structure to drive the drive ring 3 to rotate; a first closed chamber 81 is formed in the installation box and in the area between the sealing assembly 4 and each sealing ring 121.

[0044] A pressure sealing cover 7 is also provided outside each driving member, and the pressure sealing cover 7 is fixedly connected to the second end of the installation box. The area between each pressure sealing cover 7 and the installation box, the sealing ring 121 and the outer side wall of the driving member forms a second closed chamber 82; the pressurizing device is connected to the first closed chamber 81 and the second closed chamber 82, and can pressurize the first closed chamber 81 and / or the second closed chamber 82 to balance the pressure outside the first end of the installation box.

[0045] When in use, the entire main drive seal pressure compensation system 100 is fixed in the shield body 200 of the tunnel boring machine, and the drive ring 3 is used to connect the cutter head 300 to drive the cutter head 300 to rotate. The area between the cutter head 300 and the first end of the installation box forms a mud and water bin 400.

[0046] When the pressure in the mud and water bin 400 (i.e., the pressure outside the first end of the installation box) rises and exceeds the pressure range of the sealing component 4, the first closed chamber 81 can be pressurized to start the first-level pressure compensation to ensure the balance of the water and soil pressure in front and the back pressure of the sealing component 4; when the water and soil pressure outside the first end of the installation box continues to rise so that the pressure applied in the first sealed chamber exceeds the pressure range of the sealing ring 121, the second closed chamber 82 and the first closed chamber 81 can be pressurized at the same time to start the second-level pressure compensation to provide back pressure for the sealing ring 121 and increase the upper limit of the pressurization of the first closed chamber 81, so that the sum of the pressures of the sealing component 4 and the first closed chamber 81 can balance the water and soil pressure, and the pressure difference on both sides of the sealing component 4 and the sealing ring 121 are within their respective pressure ranges to ensure the effectiveness of the sealing component 4 and the sealing ring 121.

[0047] Therefore, the main drive seal pressure compensation system 100 of the present application is provided with two closed chambers on the back of the seal assembly 4. By dynamically adjusting the pressure in the two closed chambers, it is possible to ensure unlimited pressurization within the pressure range of the seal assembly 4 and the seal ring 121 to balance the water and soil pressure outside the first end of the installation box. Through two-stage pressure compensation, the effectiveness of the seal assembly 4 and the seal ring 121 under ultra-high pressure conditions can be achieved, ensuring that the tunnel boring machine can tunnel normally under ultra-high pressure conditions, and avoiding the risk of failure of the main drive seal system under ultra-high pressure conditions. The present application ensures stable, safe and economical construction without changing the existing main drive of the tunnel boring machine.

[0048] In a specific implementation, a first pressure sensor is provided outside the first end of the installation box, a second pressure sensor is provided in the first closed chamber 81, and a third pressure sensor is provided in each second closed chamber 82. The main drive seal pressure compensation system 100 also includes a controller, which is electrically connected to the first pressure sensor, the second pressure sensor, the third pressure sensor and the pressurizing device.

[0049] The pressurizing device is connected to the first closed chamber 81 through a first pipeline in a switchable manner, and is connected to multiple second closed chambers 82 through multiple second pipelines in a switchable manner; a first switch valve is provided on the first pipeline, and a second switch valve is provided on the second pipeline, and the controller is also electrically connected to the first switch valve and the second switch valve to automatically control the pressurization of the first closed chamber 81 and the second closed chamber 82.

[0050] The sensors can be used to detect the pressure at various locations in real time. The controller can dynamically adjust the pressure of the first closed chamber 81 and the second closed chamber 82 according to the pressure of the front mud and water bin 400. By automatically adjusting the pressure of the two closed chambers, automatic pressure compensation is achieved, which can ensure that the tunnel boring machine can advance normally in high-pressure formations and ensure the applicability of the main drive seal under ultra-high pressure conditions.

[0051] Furthermore, a main bearing 2 is provided in the installation box and between the drive ring 3 and the driving member. The outer ring of the main bearing 2 is fixedly connected to the installation box. Gears 13 are fixedly provided on the output shafts of each driving member. Each gear 13 can mesh with the inner ring of the main bearing 2. The drive ring 3 is fixedly connected to the inner ring of the main bearing 2.

[0052] Specifically, the installation box includes a grease box 6 and a drive box 5 that are connected and communicated with each other. The grease box 6 and the drive box 5 are both annular box bodies, and a baffle 63 is provided at the inner ring hole of the grease box 6 and at the end position away from the drive box 5 to close the inner ring hole of the grease box 6; the drive ring 3 and the sealing assembly 4 are both arranged in the grease box 6, the outer ring clamp of the main bearing 2 is fixed between the grease box 6 and the drive box 5, the drive member is fixedly connected to the drive box 5, and the output shaft of the drive member extends into the drive box 5, and the pressure sealing cover 7 is fixedly connected to the drive box 5.

[0053] Reference Figure 2 The drive box 5 includes a first mounting ring 51, a second mounting ring 52 and a support ring 53 which are axially spaced apart. The support ring 53 is connected and fixed between the first mounting ring 51 and the second mounting ring 52 and is close to the inner ring hole of the first mounting ring 51. The outer diameter of the second mounting ring 52 is greater than the outer diameter of the first mounting ring 51.

[0054] A plurality of mounting holes are circumferentially spaced apart on the second mounting ring 52, and the driving member is inserted into the mounting holes and is sealed and connected via a sealing ring 121; a mounting shaft 122 is connected to the output shaft of the driving member, and an end of the mounting shaft 122 is rotatably connected to the first mounting ring 51 (for example, via an end bearing 123), and the gear 13 is sleeved and fixed on the mounting shaft 122; the main bearing 2 is sleeved outside the first mounting ring 51, and its two end faces respectively abut against the grease box 6 and the end faces of the second mounting ring 52, and its outer ring is fixedly connected to the grease box 6 and the second mounting ring 52; the pressure sealing cover 7 is fixedly connected to the second mounting ring 52, and the driving member is fixedly connected to the second mounting ring 52 via a bracket 124.

[0055] The driving member includes a rotating power mechanism 11 and a reducer 12 which are connected to each other. The reducer 12 is sealed and connected to the installation box via a sealing ring 121 , and is fixedly connected to the installation box via a bracket 124 .

[0056] Here, the rotating power mechanism 11 can be, for example, an electric motor or a hydraulic motor, or other drive structures can be used as needed. A mud and water bin 400 is formed between the cutter head 300 and the installation box of the main drive seal pressure compensation system 100. The seal assembly 4 is located between the mud and water bin 400 and the main bearing 2. The back of the seal assembly 4, the main bearing 2, the gear 13 and the drive box 5 form the above-mentioned first closed chamber 81. The pressure sealing cover 7 is a cylindrical structure with one end open, and its open end is fixedly connected to the drive box 5. The rotating power mechanism 11 and the reducer 12 are both covered and contained therein to form a second closed chamber 82. The second closed chamber 82 is located behind the first closed chamber 81.

[0057] The first mounting ring 51 and the second mounting ring 52 can be, for example, flanges, with an annular groove on the outer wall of the driving member, which is specifically provided on the outer wall of the housing of the reducer 12, and a sealing ring 121 is embedded in the annular groove to achieve sealing between the reducer 12 and the mounting hole; the housing of the reducer 12 is fixedly connected to the second mounting ring 52 through a bracket 124. The gear 13 can be, for example, integrally formed with the mounting shaft 122, and after integrally formed, connected to the output shaft of the reducer 12 through a spline or other transmission components, and the gear 13 is axially limited between the first mounting ring 51 and the step surface of the output shaft of the reducer 12. The inner ring of the main bearing 2 is a gear ring, which meshes with each gear 13. When the rotating power mechanism 11 drives each gear 13 to rotate through the reducer 12, the inner ring of the main bearing 2 can drive the drive ring 3 to rotate, and then drive the cutter disc 300 to rotate.

[0058] Furthermore, the grease box 6 includes an inner grease ring 62 and an outer grease ring 61 which are arranged inside and outside, and the drive ring 3 is installed in an annular accommodating cavity surrounded by the inner grease ring 62 and the outer grease ring 61. The first end of the drive ring 3 can extend out of the grease box 6 and be used to connect the cutter head 300 of the tunnel boring machine, and the second end thereof can be fixedly connected to the inner ring of the main bearing 2; the outer grease ring 61 is fixedly connected to the outer ring of the main bearing 2, and the inner grease ring 62 is fixedly connected to the first mounting ring 51; the sealing assembly 4 includes an outer sealing assembly 41 arranged between the drive ring 3 and the outer grease ring 61, and an inner sealing assembly 42 arranged between the drive ring 3 and the inner grease ring 62.

[0059] A first limiting ring 611 with a reduced inner diameter is formed on the inner wall of the outer grease ring 61 and close to the first end of the driving ring 3, and a second limiting ring 6211 with an increased outer diameter is formed on the outer wall of the inner grease ring 62 and close to the first end of the driving ring 3. The first limiting ring 611 and the second limiting ring 6211 can axially limit the driving ring 3 to confine the driving ring 3 in the grease box 6.

[0060] In order to facilitate processing and installation, the inner grease ring 62 includes a pressure ring 621 and an inner ring body 622 connected to each other, and the inner ring body 622 is connected to the first mounting ring 51. The inner ring of the main bearing 2 and the drive ring 3, the outer ring of the main bearing 2 and the outer grease ring 61, and the outer ring of the main bearing 2 and the second mounting ring 52 can be connected and fixed by fasteners (such as bolts).

[0061] Furthermore, the working process of the main drive seal pressure compensation system 100 is as follows:

[0062] In the initial state, the pressure in the first sealed chamber 81 and the second sealed chamber 82 is very small and can be ignored. The pressure difference between the mud and water tank 400 and the first sealed chamber 81 is recorded as the first pressure difference, and the pressure difference between the first sealed chamber 81 and the second sealed chamber 82 is recorded as the second pressure difference.

[0063] During the excavation process of the tunnel boring machine, the pressure in the mud and water bin 400 begins to change.

[0064] When the pressure in the mud and water bin 400 is low, so that the first pressure difference is lower than the first preset upper limit value, the pressurizing device does not work, and neither the first sealed chamber 81 nor the second sealed chamber 82 is pressurized.

[0065] When the pressure in the mud and water bin 400 increases, causing the first pressure difference to exceed the first preset upper limit value, the pressurizing device is started to pressurize the first closed chamber 81 until the first pressure difference is less than or equal to the first preset upper limit value (ensuring that the pressure difference between the two is controlled to be a pressure that the sealing component 4 can withstand); this process is the first level of pressure compensation.

[0066] When the pressure in the mud and water bin 400 continues to rise, so that the pressure applied to the first closed chamber 81 is relatively large, and the second pressure difference exceeds the second preset upper limit, the pressurizing device is started to pressurize both the first closed chamber 81 and the second closed chamber 82 at the same time, until the second pressure difference is less than or equal to the second preset upper limit, and the first pressure difference is less than or equal to the first preset upper limit; this process is the second level of pressure compensation. It can be understood that in the first level of pressure compensation process, the pressurization of the first closed chamber 81 does not cause the second pressure difference to exceed the second preset upper limit, so this process only pressurizes the first closed chamber 81 to provide back pressure for the sealing component 4; when the pressure in the mud and water bin 400 continues to rise, so that the pressurization of the first closed chamber 81 causes the second pressure difference to exceed the second preset upper limit, the second level of pressure compensation will be started, and the back pressure will be provided for the sealing ring 121 at the same time.

[0067] When the pressure in the mud and water bin 400 continues to decrease, the pressure in the first closed chamber 81 and the second closed chamber 82 is released simultaneously. When releasing the pressure simultaneously, it should be ensured that the first pressure difference is less than or equal to the first preset upper limit value, and the second pressure difference is less than or equal to the second preset upper limit value; when the pressure in the mud and water bin 400 is reduced to the sum of the first preset upper limit value and the second preset upper limit value, the pressure in the second closed chamber 82 is completely released.

[0068] When the pressure in the mud and water bin 400 continues to decrease, the pressure in the first closed chamber 81 continues to be released until the sealing assembly 4 can independently bear the mud and water pressure in the mud and water bin 400 (that is, when the pressure in the mud and water bin 400 is reduced to less than or equal to the first preset upper limit value), and the pressure in the first closed chamber 81 is also released.

[0069] The first preset upper limit is smaller than the upper pressure limit of the sealing assembly 4, and the second preset upper limit is smaller than the upper pressure limit of the sealing ring 121. The specific values ​​are determined according to actual needs. In general, during excavation, the pressure in the mud and water bin 400 is greater than or equal to the pressure in the first sealed chamber 81, and the pressure in the first sealed chamber 81 is greater than or equal to the pressure in the second sealed chamber 82.

[0070] Of course, the above working process is only an example for illustration. In actual application, it can be flexibly adjusted according to actual conditions. As long as the first pressure difference is less than or equal to the first preset upper limit value and the second pressure difference is less than or equal to the second preset upper limit value through dynamic adjustment control of the two-stage pressure, the two closed chambers on the back of the sealing component 4 are used to balance the water and soil pressure in the mud and water bin 400 through two-stage pressure compensation, which not only improves the bearing capacity of the sealing ring 121 and ensures the effectiveness of the sealing component 4 and the sealing ring 121, but also effectively solves the problem of insufficient pressure bearing capacity of the main drive seal of the tunnel boring machine in high-pressure construction projects, ensuring that the tunnel boring machine can dig normally.

[0071] Furthermore, the present application also provides a main drive seal pressure compensation method, wherein a first closed chamber 81 is formed between a seal assembly 4 on the periphery of a drive ring 3 of a roadheader and a seal ring 121 on the periphery of a drive member, and a pressure seal cover 7 is provided on the outer cover of the drive member to form a second closed chamber 82 between the pressure seal cover 7, the periphery of the drive member and the seal ring 121; the main drive seal pressure compensation method comprises:

[0072] Real-time detection of the pressure of the mud and water bin 400 in front of the drive ring 3, the pressure in the first sealed chamber 81, and the pressure in the second sealed chamber 82;

[0073] Calculate the pressure difference between the mud and water tank 400 and the first sealed chamber 81 and the pressure difference between the first sealed chamber 81 and the second sealed chamber 82, and record them as the first pressure difference and the second pressure difference respectively;

[0074] Adjusting the pressures of the first sealed chamber 81 and the second sealed chamber 82 so that the first pressure difference is less than or equal to a first preset upper limit value, and the second pressure difference is less than or equal to a second preset upper limit value;

[0075] The first preset upper limit value is smaller than the upper limit value of the pressure of the sealing component 4 , and the second preset upper limit value is smaller than the upper limit value of the pressure of the sealing ring 121 .

[0076] Specifically, adjusting the pressure of the first sealed chamber 81 and the second sealed chamber 82 includes:

[0077] When the pressure of the mud and water tank 400 increases so that the first pressure difference exceeds the first preset upper limit value, the first closed chamber 81 is pressurized until the first pressure difference is less than or equal to the first preset upper limit value;

[0078] When the first sealed chamber 81 rises so that the second pressure difference exceeds the second preset upper limit, both the first sealed chamber 81 and the second sealed chamber 82 are pressurized simultaneously until the second pressure difference is less than or equal to the second preset upper limit, and the first pressure difference is less than or equal to the first preset upper limit.

[0079] The entire method can achieve two-stage pressure compensation by dynamically adjusting the pressure in the two closed chambers on the back of the sealing component 4, thereby improving the pressure-bearing capacity of the main drive system. When the working environment pressure is too high, the pressure borne by the sealing component 4 when the tunnel boring machine is working can be reduced to the pressure value that the sealing component 4 can withstand, and the pressure borne by the sealing ring 121 at the driving part can also be reduced to the pressure value that the sealing ring 121 can withstand, so that the tunnel boring machine can meet the requirements of normal use under high water pressure conditions.

[0080] Furthermore, the main drive seal pressure compensation method can be implemented using the above-mentioned main drive seal pressure compensation system 100. The specific working process has been described in detail above and will not be repeated here.

[0081] Furthermore, the present application also provides a tunnel boring machine, including a cutter disc 300, a shield body 200 and the above-mentioned main drive seal pressure compensation system 100; the mounting box is fixedly arranged in the shield body 200 (specifically, the second mounting ring 52 of the above-mentioned drive box 5 is fixedly connected to the shield body 200), and the end of the drive ring 3 can extend out of the first end of the mounting box and be connected to the cutter disc 300 to drive the cutter disc 300 to rotate.

[0082] The tunnel boring machine here includes but is not limited to tunnel boring machines such as shield machines, inclined shaft tunnel boring machines, and vertical shaft tunnel boring machines. Taking the shield machine as an example, when the shield machine is working, the drive ring 3 drives the cutter head 300 to rotate, the shield body 200 moves forward, and the cutter head 300 and the mud in the mud and water bin 400 establish the pressure of the mud and water bin 400. When the pressure in the mud and water bin 400 is too high, the pressure bearing capacity of the sealing component 4 is limited, which will cause the seal to fail, causing the mud in the mud and water bin 400 to enter the driving box 5 through the sealing component 4. When the first closed chamber 81 is pressurized, the first-level pressure compensation is performed on the back of the sealing assembly 4. At this time, the drive box 5 bears a portion of the mud and water pressure in the mud and water bin 400. When the second closed chamber 82 is pressurized, the second-level pressure compensation is performed on the back of the first closed chamber 81. The upper limit of the pressurization of the first closed chamber 81 can be increased, and the pressure-bearing capacity of the drive box 5 can be increased. The two-stage pressure compensation system can increase the pressure-bearing range of the main drive seal to ensure the normal excavation of the shield machine.

[0083] The tunnel boring machine includes the above-mentioned main drive seal pressure compensation system 100, and has the same effect. The tunnel boring machine of the present application adds a pressure seal cover 7 on the basis of not changing the original system of the tunnel boring machine to realize the pressure compensation function to balance the ultra-high water pressure. When the tunnel boring machine is subjected to high water pressure, the main drive seal pressure is compensated to avoid the failure of the seal under high water pressure conditions, which causes the tunnel boring machine to be unable to dig normally, avoids mud from entering the interior of the tunnel boring machine, and ensures the normal operation of the tunnel boring machine.

[0084] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A main drive seal pressure compensation system, characterized in that: It comprises a mounting box, a driving ring (3), a plurality of driving parts and a pressurizing device; The drive ring (3) is rotatably and sealably arranged in the first end of the installation box through a sealing assembly (4); a plurality of drive members are fixedly arranged at the second end of the installation box at circumferential intervals; each of the drive members is sealably connected to the installation box through a sealing ring (121); an output shaft of each of the drive members extends into the installation box and is connected to the drive ring (3) through a transmission structure to drive the drive ring (3) to rotate; a first closed chamber (81) is formed in the installation box and in an area between the sealing assembly (4) and each of the sealing rings (121); A pressure sealing cover (7) is also provided outside each of the driving members, and the pressure sealing cover (7) is fixedly connected to the second end of the installation box. The area between each of the pressure sealing covers (7) and the installation box, the sealing ring (121) and the outer wall of the driving member forms a second closed chamber (82); the pressurizing device is connected to the first closed chamber (81) and the second closed chamber (82), and can pressurize the first closed chamber (81) and / or the second closed chamber (82).

2. The main drive seal pressure compensation system according to claim 1, characterized in that: A first pressure sensor is also provided outside the first end of the installation box, a second pressure sensor is provided in the first sealed chamber (81), and a third pressure sensor is provided in each of the second sealed chambers (82). The main drive seal pressure compensation system (100) further comprises a controller, wherein the controller is electrically connected to the first pressure sensor, the second pressure sensor, the third pressure sensor and the pressurizing device.

3. The main drive seal pressure compensation system according to claim 2, characterized in that: The pressurizing device is connected to the first sealed chamber (81) in an on-off manner through a first pipeline, and is connected to the plurality of second sealed chambers (82) in an on-off manner through a plurality of second pipelines; a first switch valve is provided on the first pipeline, a second switch valve is provided on the second pipeline, and the controller is also electrically connected to the first switch valve and the second switch valve.

4. The main drive seal pressure compensation system according to claim 1, characterized in that: A main bearing (2) is also provided in the installation box and between the drive ring (3) and the drive member. The outer ring of the main bearing (2) is fixedly connected to the installation box. A gear (13) is fixedly provided on the output shaft of each of the drive members. Each of the gears (13) can mesh with the inner ring of the main bearing (2). The drive ring (3) is fixedly connected to the inner ring of the main bearing (2).

5. The main drive seal pressure compensation system according to claim 4, characterized in that: The installation box comprises a grease box (6) and a drive box (5) which are connected and communicated with each other. The grease box (6) and the drive box (5) are both annular box bodies, and a baffle (63) is provided at the inner ring hole of the grease box (6) and at the end position away from the drive box (5); the drive ring (3) and the sealing assembly (4) are both arranged in the grease box (6), the outer ring of the main bearing (2) is clamped and fixed between the grease box (6) and the drive box (5), the drive member is fixedly connected to the drive box (5), and the output shaft of the drive member extends into the drive box (5), and the pressure sealing cover (7) is fixedly connected to the drive box (5).

6. The main drive seal pressure compensation system according to claim 5, characterized in that: The drive box (5) comprises a first mounting ring (51), a second mounting ring (52) and a support ring (53) which are arranged axially at intervals, the support ring (53) being connected and fixed between the first mounting ring (51) and the second mounting ring (52) and close to the inner ring hole of the first mounting ring (51), and the outer diameter of the second mounting ring (52) is larger than the outer diameter of the first mounting ring (51); A plurality of mounting holes are circumferentially spaced apart on the second mounting ring (52), and the driving member is inserted into the mounting holes and is sealed and connected via the sealing ring (121); a mounting shaft (122) is connected to the output shaft of the driving member, and the end of the mounting shaft (122) is rotatably connected to the first mounting ring (51), and the gear (13) is sleeved and fixed on the mounting shaft (122); the main bearing (2) is sleeved on the outside of the first mounting ring (51), and its two end surfaces are respectively pressed against the end surfaces of the grease box (6) and the second mounting ring (52), and its outer ring is fixedly connected to the grease box (6) and the second mounting ring (52); the pressure sealing cover (7) is fixedly connected to the second mounting ring (52), and the driving member is fixedly connected to the second mounting ring (52) via a bracket (124).

7. The main drive seal pressure compensation system according to claim 6, characterized in that: The grease box (6) comprises an inner grease ring (62) and an outer grease ring (61) which are arranged inside and outside the grease box. The drive ring (3) is installed in an annular accommodating cavity surrounded by the inner grease ring (62) and the outer grease ring (61). The first end of the drive ring (3) can extend out of the grease box (6) and be used to connect the cutter head (300) of the tunnel boring machine, and the second end can be fixedly connected to the inner ring of the main bearing (2). The outer grease ring (61) is fixedly connected to the outer ring of the main bearing (2), and the inner grease ring (62) is fixedly connected to the first mounting ring (51). The sealing assembly (4) comprises an outer sealing assembly (41) arranged between the drive ring (3) and the outer grease ring (61), and an inner sealing assembly (42) arranged between the drive ring (3) and the inner grease ring (62).

8. The main drive seal pressure compensation system according to claim 1, characterized in that: The driving member comprises a rotating power mechanism (11) and a reducer (12) connected to each other; the reducer (12) is sealedly connected to the installation box via a sealing ring (121) and is fixedly connected to the installation box via a bracket (124).

9. A main drive seal pressure compensation method, characterized in that: A first sealed chamber (81) is formed between a sealing assembly (4) on the periphery of a driving ring (3) of a roadheader and a sealing ring (121) on the periphery of a driving member, and a pressure sealing cover (7) is provided on the outer cover of the driving member to form a second sealed chamber (82) between the pressure sealing cover (7), the periphery of the driving member and the sealing ring (121); the main driving seal pressure compensation method comprises: Real-time detection of the pressure of the mud and water bin (400) in front of the drive ring (3), the pressure in the first sealed chamber (81), and the pressure in the second sealed chamber (82); Calculating the pressure difference between the mud and water bin (400) and the first sealed chamber (81) and the pressure difference between the first sealed chamber (81) and the second sealed chamber (82), and recording them as a first pressure difference and a second pressure difference respectively; Adjusting the pressure of the first sealed chamber (81) and the second sealed chamber (82) so that the first pressure difference is less than or equal to a first preset upper limit value, and the second pressure difference is less than or equal to a second preset upper limit value; The first preset upper limit value is smaller than the upper pressure limit value of the sealing component (4), and the second preset upper limit value is smaller than the upper pressure limit value of the sealing ring (121).

10. The main drive seal pressure compensation method according to claim 9, characterized in that: Adjusting the pressure of the first sealed chamber (81) and the second sealed chamber (82) includes: When the pressure of the mud and water bin (400) increases so that the first pressure difference exceeds the first preset upper limit value, pressurizing the first closed chamber (81) until the first pressure difference is less than or equal to the first preset upper limit value; When the first sealed chamber (81) rises so that the second pressure difference exceeds the second preset upper limit value, both the first sealed chamber (81) and the second sealed chamber (82) are pressurized simultaneously until the second pressure difference is less than or equal to the second preset upper limit value, and the first pressure difference is less than or equal to the first preset upper limit value.

11. A tunnel boring machine, characterized in that: It comprises a cutter disc (300), a shield body (200) and a main drive seal pressure compensation system (100) as claimed in any one of claims 1 to 8; The installation box is fixedly arranged in the shield body (200), and the end of the driving ring (3) can extend out of the first end of the installation box and be connected to the cutter disc (300) to drive the cutter disc (300) to rotate.

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