Pressure measurement system and method for sealing cavity of main bearing of roadheader and main bearing system

Abstract

The present invention provides a pressure measurement system, method and main bearing system for the sealing cavity of a main bearing of a tunnel boring machine. The pressure measurement system comprises: a pipeline pressure measuring device and a cavity pressure measuring device; the pipeline pressure measuring device can be connected to the connecting cavity to measure the pressure at the port of the connecting cavity; the cavity pressure measuring device comprises a support tube and a pressure measuring core, the pressure measuring core is installed at the front end of the support tube, the support tube can be inserted into the connecting cavity, and the pressure measuring core is located in the sealing cavity of the main bearing, thereby solving the technical problem that it is difficult to accurately measure the pressure in the sealing cavity of the main bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of tunneling equipment, and in particular to a pressure measurement system and method for a main bearing sealing cavity of a tunneling machine, and a main bearing system. Background Art

[0002] Main bearing sealing technology for tunnel boring machines is a key component of the entire machine. The seal's pressure-bearing capacity dictates that the grease pressure within the seal chamber must not exceed the seal's design-allowable pressure. Failure to do so can easily damage the seal, leading to significant project losses. Therefore, accurate measurement of the grease pressure within the seal chamber is crucial. In deep wells, submarine tunnels, and other operating conditions with high burial depths and water pressures, the main bearing seal's pressure-bearing capacity is highly demanding, making accurate measurement of the oil pressure within the seal chamber increasingly crucial. Currently, research on main bearing seals primarily focuses on grease injection control and methods, as well as seal temperature control.

[0003] Chinese invention patent application CN105627069A discloses a pressure inspection device for detecting the pressure of the main drive outer sealing chamber, but the measurement accuracy is poor; Chinese invention patent application CN111810825A proposes installing a pressure sensor at the connection between the return oil pipeline and the grease sealing chamber to monitor the grease pressure in the sealing chamber, but it is difficult to reduce the pressure fluctuations generated when the grease is injected; in the technical solution disclosed in Chinese invention patent application CN114635967A, a pressure sensor is installed on the pipeline to detect the pressure of the sealing chamber, which makes it difficult to avoid the pressure fluctuations during grease injection, resulting in large data acquisition errors.

[0004] In summary, it is difficult to accurately measure the pressure in the main bearing sealing cavity with the existing technology. Summary of the Invention

[0005] The purpose of the present invention is to provide a pressure measurement system and method for the main bearing sealing cavity of a roadheader, and a main bearing system, so as to solve the technical problem that it is difficult to accurately measure the pressure in the main bearing sealing cavity.

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

[0007] The present invention provides a pressure measurement system for a sealed cavity of a main bearing of a roadheader. The main bearing of the roadheader is provided with a communication channel communicating with the sealed cavity of the main bearing. The pressure measurement system comprises: a pipeline pressure measurement device and a cavity pressure measurement device; the pipeline pressure measurement device can be connected to the communication channel to measure the pressure at a port of the communication channel;

[0008] The cavity pressure measuring device includes a support tube and a pressure measuring core. The pressure measuring core is installed at the front end of the support tube. The support tube can be inserted into the communicating channel, and the pressure measuring core is located in the main bearing sealing cavity.

[0009] In a preferred embodiment, the cavity pressure measuring device includes a core seat, which is arranged at the front end of the support tube, and the pressure measuring core is installed on the core seat. The core seat is provided with a connecting structure for detachably fixing to the main bearing sealing cavity.

[0010] In a preferred embodiment, the connection structure includes a locking nut.

[0011] In a preferred embodiment, the cavity pressure measuring device includes a valve body connecting seat and a first valve body that can be connected to the port of the connecting channel. The valve body connecting seat is arranged outside the support tube, and the valve body connecting seat can be connected to the first valve body; the core seat and the entire pressure measuring core and at least part of the support tube can pass through the first valve body.

[0012] In a preferred embodiment, the valve body connecting seat is movably sleeved on the support tube.

[0013] In a preferred embodiment, the front end surface of the valve body connecting seat is provided with an accommodating cavity capable of accommodating at least a portion of the core seat.

[0014] In a preferred embodiment, the rear end of the support tube is provided with an electrical connector electrically connected to the pressure measuring core.

[0015] In a preferred embodiment, the pipeline pressure measuring device includes a pressure sensor and a second valve body, the pressure sensor is connected to the second valve body, and the second valve body can be connected to the port of the communicating channel so that the pressure sensor is connected to the communicating channel through the second valve body.

[0016] In a preferred embodiment, the pipeline pressure measuring device includes a pulse damper, and the pulse damper is connected to the second valve body.

[0017] The present invention provides a main bearing system for a roadheader, comprising a main bearing for the roadheader and a pressure measurement system for a sealed cavity of the main bearing for the roadheader. The main bearing for the roadheader is provided with a sealed cavity for the main bearing and a communication channel communicating with the sealed cavity for the main bearing;

[0018] The pipeline pressure measuring device is connected to the communication channel, and / or the cavity pressure measuring device is connected to the communication channel.

[0019] In a preferred embodiment, the communication channel includes a pressure measurement channel and a grease injection channel distributed along the circumferential direction.

[0020] In a preferred embodiment, at least one of the communication channels is connected to a third valve body, and the pipeline pressure measuring device and the cavity pressure measuring device are respectively detachably connected to the third valve body.

[0021] The present invention provides a method for measuring the pressure of the main bearing sealing cavity of a tunnel boring machine, using the above-mentioned pressure measurement system for the main bearing sealing cavity of the tunnel boring machine. The pressure measurement method includes: the pipeline pressure measuring device measures the pressure of the port of the connecting channel; the cavity pressure measuring device measures the pressure inside the main bearing sealing cavity.

[0022] The characteristics and advantages of the present invention are:

[0023] By inserting the support tube in the cavity pressure measuring device into a connecting channel, the pressure at the point corresponding to the connecting channel in the main bearing sealing cavity can be directly measured; and by combining it with the measurement value of the pipeline pressure measuring device, the pipe loss pressure of the connecting channel can be obtained. In this way, for other connecting channels, the pressure of the port measured by the pipeline pressure measuring device is combined with the pipe loss pressure to calculate the pressure of the point corresponding to other connecting channels in the main bearing sealing cavity.

[0024] The pressure measurement system provided by the present invention can accurately measure the grease pressure in the main bearing sealing cavity, reduce the interference problem of inaccurate pressure measurement and low precision caused by the long grease flow channel in the main bearing sealing cavity; and it is convenient to measure the pressure of multiple points in the main bearing sealing cavity, and the pressure-bearing state of the entire sealing ring is fully grasped, and the grease pressure distribution acting on the seal can be detected with high precision, especially on ultra-large diameter equipment. It is beneficial to judge the usage of each sealing point according to the obtained pressure distribution state, so that sealing problems can be discovered earlier, so that effective measures can be taken to deal with it. If overpressure occurs at a certain point, the relevant problems can be found and solved as soon as possible; and on the basis of realizing circumferential pressure measurement, the pressure measurement channels are reduced, and the economic effect of the product is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the installation state of the cavity pressure measuring device in the pressure measuring system of the main bearing sealing cavity of the tunnel boring machine provided by the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the working state of the cavity pressure measuring device shown;

[0028] Figure 3 For installation Figure 1 Schematic diagram of the cross section of the communication channel of the cavity pressure measuring device at the main bearing of the tunnel boring machine;

[0029] Figure 4 A schematic structural diagram of a cavity pressure measuring device in a pressure measuring system for a sealed cavity of a main bearing of a roadheader provided by the present invention;

[0030] Figure 5 for Figure 4 A partial enlarged view of point A in the middle;

[0031] Figure 6 for Figure 2 A partial enlarged view of point B in the middle;

[0032] Figure 7 A schematic diagram of the installation state of the pipeline pressure measuring device in the pressure measuring system of the main bearing sealing chamber of the tunnel boring machine provided by the present invention;

[0033] Figure 8 For installation Figure 7 Schematic diagram of the cross section of the connecting channel of the pipeline pressure measuring device at the main bearing of the tunnel boring machine;

[0034] Figure 9 This is a partial cross-sectional view of the main bearing of the tunnel boring machine;

[0035] Figure 10 A schematic cross-sectional view of multiple connecting channels of a main bearing of a roadheader;

[0036] Figure 11 This is the connection diagram of the main bearing of the tunnel boring machine;

[0037] Figure 12 This is a schematic diagram of the pressure measurement method of the main bearing sealing chamber of a tunnel boring machine provided by the present invention.

[0038] Description of Figure Numbers:

[0039] 1. Cavity pressure measuring device;

[0040] 11. Pressure measuring core; 12. Core seat; 13. Connection structure; 131. Locking nut;

[0041] 14. Support tube; 141. Sealing element;

[0042] 15. Valve body connecting seat; 151. Accommodating cavity;

[0043] 16. Electrical connector; 17. Housing; 18. First valve body;

[0044] 2. Pipeline pressure measuring device;

[0045] 21. Pressure sensor; 22. Pulsation damper; 23. Second valve body;

[0046] 3. Third valve body; 31. Handle;

[0047] 4. Communication channel; 41. Pressure measurement channel; 42. Grease injection channel;

[0048] 5. Main bearing sealing chamber; 51. First chamber; 52. Second chamber; 53. Third chamber;

[0049] 61. Seal mounting seat structure; 62. Rubber seal; 63. Rotating shaft; 64. Rotating shaft bearing mounting seat.

[0050] 71. Motor; 72. Reducer; 73. Pinion; 74. Gear; 75. Main bearing of tunnel boring machine. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] Option 1

[0053] The main bearing of the tunnel boring machine is provided with a communication channel 4 communicating with the main bearing sealing chamber 5 .

[0054] The present invention provides a pressure measurement system for a main bearing sealing cavity of a roadheader, the pressure measurement system comprising: a pipeline pressure measurement device 2 and a cavity pressure measurement device 1; the pipeline pressure measurement device 2 can be connected to a communication channel 4 to measure the pressure at a port of the communication channel 4;

[0055] The cavity pressure measuring device 1 includes a support tube 14 and a pressure measuring core 11 . The pressure measuring core 11 is installed at the front end of the support tube 14 . The support tube 14 can be inserted into the communication channel 4 , and the pressure measuring core 11 is located in the main bearing sealing cavity 5 .

[0056] The pressure P1 at the port of the connecting channel 4 is measured by the pipeline pressure measuring device 2; the support tube 14 can deliver the pressure measuring core 11 to the main bearing sealing cavity 5 to measure the pressure P2 in the main bearing sealing cavity 5; after calculation, the pipe loss pressure ΔP of the connecting channel 4 is obtained as P1-P2.

[0057] By inserting the support tube 14 in the cavity pressure measuring device 1 into a connecting channel 4, the pressure at the point corresponding to the connecting channel 4 in the main bearing sealing cavity 5 can be directly measured; by combining it with the measurement value of the pipeline pressure measuring device 2, the pipe loss pressure of the connecting channel 4 can be obtained. In this way, for other connecting channels 4, the pressure of the port measured by the pipeline pressure measuring device 2 is combined with the pipe loss pressure to obtain the pressure of the point corresponding to other connecting channels 4 in the main bearing sealing cavity 5.

[0058] The pressure measurement system provided by the present invention can accurately measure the grease pressure in the main bearing sealing cavity 5, reducing the problem of inaccurate pressure measurement and low precision in the main bearing sealing cavity 5 due to the long grease flow channel; and it is convenient to measure the pressure of multiple points in the main bearing sealing cavity 5, and the pressure-bearing state of the entire sealing ring is fully grasped, and the grease pressure distribution acting on the seal can be detected with high precision, especially on ultra-large diameter equipment. It is beneficial to judge the usage of each sealing point according to the obtained pressure distribution state, so that sealing problems can be discovered earlier so that effective measures can be taken to deal with them. If overpressure occurs at a certain point, the relevant problems can be found and solved as soon as possible; and, on the basis of realizing circumferential pressure measurement, the pressure measurement channel 41 is reduced, thereby improving the economic effect of the product.

[0059] like Figure 1-Figure 5 As shown, the cavity pressure measuring device 1 includes a core seat 12, which is arranged at the front end of the support tube 14. The pressure measuring core 11 is installed on the core seat 12. The core seat 12 is provided with a connecting structure 13 for detachably fixing to the main bearing sealing cavity 5. After the support tube 14 extends the core seat 12 into the main bearing sealing cavity 5, the core seat 12 is fixed by the connecting structure 13 to ensure that the pressure measuring core 11 accurately measures the pressure of the corresponding point.

[0060] In one embodiment, the connection structure 13 includes a locking nut 131, which is secured by threading. Specifically, threads can be provided at the junction between the main bearing seal chamber 5 and the communication passage 4 to enable threaded connection with the locking nut 131. The connection structure 13 is not limited to the locking nut 131; other structures capable of securing the core seat 12 to the sidewall of the main bearing seal chamber 5 may also be employed.

[0061] In one embodiment, the cavity pressure measurement device 1 includes a valve body connector 15 and a first valve body 18 that can be connected to a port of the communication channel 4. The valve body connector 15 is sleeved over the support tube 14 and can be connected to the first valve body 18. The core body seat 12 and the entire pressure measurement core 11, as well as at least a portion of the support tube 14, can pass through the first valve body 18. When disassembling the cavity pressure measurement device 1, the communication channel 4 is cut off by the first valve body 18, making it easier to replace the support tube 14, core body seat 12, and pressure measurement core 11. The first valve body 18 can be a manual valve equipped with a handle 31.

[0062] like Figure 1 、 Figure 2 and Figure 6 As shown, the valve body connection seat 15 is movably connected to the support tube 14. When disassembling the cavity pressure measuring device 1, the support tube 14 can slide in the valve body connection seat 15, so that the valve body connection seat 15 can be connected to the first valve body 18 first, which facilitates disassembly and assembly. Furthermore, a seal 141 is provided between the valve body connection seat 15 and the support tube 14. The seal 141 seals the pipeline pressure, thereby preventing the grease pressure from being released.

[0063] In one embodiment, the front end surface of the valve body connecting seat 15 is provided with an accommodating cavity 151 capable of accommodating at least part of the core seat 12. Figure 6 As shown, the locking nut 131 and the core seat 12 are connected as an integral structure, and the accommodating cavity 151 can protect the locking nut 131 and the core seat 12; in addition, the inner wall of the accommodating cavity 151 can be provided with a thread that cooperates with the first valve body 18 to achieve continuity with the first valve body 18.

[0064] The rear end of the support tube 14 is provided with an electrical connector 16 electrically connected to the pressure measuring core 11. The pressure measuring core 11 can be connected to an external host computer or other equipment through the electrical connector 16 to transmit and record measurement data. The core seat 12 and the locking nut 131 can be connected as a whole by welding; the support tube 14 can be made of a stainless steel pipe, and a shell 17 can be provided at the rear end of the support tube 14 to facilitate the installation of the connector. During the process of withdrawing the cavity pressure measuring device 1, the first valve body 18 is closed after the pressure measuring core 11 is withdrawn to the switch of the first valve body 18; after the valve body connecting seat 15 is removed, the support tube 14, the core seat 12 and the pressure measuring core 11 can be replaced.

[0065] The pipeline pressure measuring device 2 can use a common pressure sensor 21, which can be connected to the communication channel 4 to achieve pressure measurement. In one embodiment, the pipeline pressure measuring device 2 includes a pressure sensor 21 and a second valve body 23, such as Figure 7As shown, the pressure sensor 21 is connected to the second valve body 23, and the second valve body 23 can be connected to the port of the connecting channel 4 so that the pressure sensor 21 is connected to the connecting channel 4 through the second valve body 23. The pressure sensor 21 is used to measure the pressure of the grease injection point in the pipeline; the second valve body 23 is used to cut off the pressure to facilitate the replacement of the pressure sensor 21.

[0066] Furthermore, the pipeline pressure measurement device 2 includes a pulse dampener 22 connected to a second valve body 23. The pulse dampener 22 is used to reduce pressure fluctuations generated during grease injection. During grease injection, the pulse dampener 22 reduces the pressure at the injection point, reducing pressure fluctuations. This allows measurement of the current pipeline injection point pressure value P1, improving measurement accuracy. After the second valve body 23 shuts off the pressure, the pressure sensor 21 and pulse dampener 22 can be replaced. The pressure sensor 21 and pulse dampener 22 can be connected in parallel.

[0067] Both the first valve body 18 and the second valve body 23 can be connected to the port of the connecting channel 4. The first valve body 18 and the second valve body 23 can be the same valve body, that is: the valve body is connected to the port of the connecting channel 4. When the pressure of the port of the connecting channel needs to be measured, the pipeline pressure measuring device 2 can be installed through the valve body; when the pressure in the main bearing sealing cavity 5 needs to be measured, the cavity pressure measuring device 1 can be installed through the valve body.

[0068] like Figure 1 、 Figure 2 、 Figure 7 and Figure 9 As shown, the main bearing of the tunnel boring machine includes: a seal mounting seat structure 61, a rubber seal 62 and a rotating shaft bearing mounting seat 64. The rotating shaft 63 rotates through the bearing on the rotating shaft bearing mounting seat 64 and its power device. Figure 11 As shown, the main bearing 75 of the tunnel boring machine provides support and positioning for the rotating shaft, and the motor 71 is connected to the rotating shaft 63 through the reducer 72, the small gear 73 and the large gear 74 to provide rotational power for the rotating shaft 63.

[0069] Rotational friction is generated between the rubber seal 62 and the rotating shaft 63, and grease needs to be injected through the set grease channel to achieve wear reduction; due to external debris and water head pressure, the debris can easily pass through the front channel and reach the rubber seal 62. The lubricating grease at the seal needs to be continuously squeezed out and consumed to prevent the external debris from entering the main bearing seal. Under the external pressure and active squeezing and consumption of grease, grease pressure must be established in the sealing cavity to overcome the external debris pressure.

[0070] The lubricating grease is connected to the grease hole channel on the rotating shaft bearing mounting seat 64 and the grease hole channel on the sealing mounting seat structural member 61 through an external pipeline. After entering between the two sealing cavities, it is squeezed out on the front pressure side. The main bearing sealing cavity 5 can be composed of a single or multiple components. According to the external use pressure requirements, the main bearing seal can be provided with a single or multiple rubber seals 62 and lubrication channels. Normally, the pressure measurement channel 41 requires additional grease hole channels for monitoring, but due to structural limitations, it is impossible to add additional measurement channels indefinitely to achieve pressure measurement, and thus it is impossible to monitor the pressure status of the entire circle of seals. Generally, the rotating shaft bearing mounting seat 64 requires lubrication channels for multiple rubber seals 62, and the space for connecting bolts and other things limits the number of injection hole channels. Generally, the pressure measurement channel 41 for measuring the pressure in the cavity is composed of a single or multiple components.

[0071] The pressure measurement system can process data through a host computer. Multiple connecting channels 4 are equipped with pipeline pressure measurement devices 2 to monitor the pressure of any connecting channel 4. The measured pressure value P1 can be input into the host computer for data reading via sensor data signal transmission.

[0072] When grease is injected into the other connecting channels 4 at the rear end, the pressure measuring core 11 in the cavity pressure measuring device 1 can directly measure the pressure value P2 in the bearing sealing cavity, which can be input to the host computer for data reading through sensor data signal transmission.

[0073] When the host computer reads the relevant P1 and P2 values, it obtains ΔP = P1 - P2. If a pipeline pressure measuring device 2 is installed on other connecting channels 4, the pressure in the entire circumferential bearing seal cavity can be accurately measured. If a sensor installed on a channel pipeline measures a pressure value of P3, the pressure in the bearing seal cavity at the corresponding injection point is P3 cavity = P3 - ΔP. Correspondingly, by measuring the Px value on other connecting channels 4 using the pipeline pressure measuring device 2, the Px cavity value at different points can be determined, thus enabling pressure monitoring of the seal cavity at the injection point of the entire seal ring.

[0074] The pressure of the main bearing seal grease cavity is generally measured by installing a sensor on the pressure measurement channel. When using large-diameter seals, it is usually necessary to add multiple additional grease channels for measurement. Due to limitations of structural components and other related factors, it is impossible to add more points to monitor the full pressure conditions of the seal.

[0075] The pressure measurement system for the main bearing seal cavity of a roadheader, provided by the present invention, directly monitors the pressure status of each seal point in real time through the coordinated operation of a pipeline pressure measurement device 2 and a cavity pressure measurement device 1. This protects the seal from overpressure and reduces damage to the main bearing seal. Accurate pressure measurements are obtained at each point in the main bearing seal cavity, providing a comprehensive understanding of the operating status of each seal.

[0076] During the excavation process, the tunnel boring machine generally has to withstand water and soil pressure; accordingly, the main bearing seal also needs to withstand external pressure. The oil pressure in the main bearing seal cavity 5 is not allowed to be completely released, and pressure release can easily cause the seal to be over-pressurized and cause the risk of breakdown. Therefore, the rear-end components such as the pressure sensor 21 need to be replaced by cutting off the pressure. Replacement method: The pipeline pressure measuring device 2 can directly cut off the pressure of the connecting channel 4 through the second valve body 23, and then replace the pressure sensor 21 and the pulse damper 22; the cavity pressure measuring device 1, such as Figure 1-Figure 2 As shown, the core seat 12 needs to be retracted to the first valve body 18, and the pressure of the communication channel 4 is cut off through the first valve body 18 before replacement. When the components are abnormally damaged, the components can be replaced without pressure relief, reducing the risk of pressure loss in the sealing cavity and seal overload damage caused by abnormal operation.

[0077] Option 2

[0078] The present invention provides a main bearing system for a roadheader, comprising a main bearing and the aforementioned pressure measurement system for the main bearing's sealed chamber. The main bearing is provided with a main bearing sealed chamber 5 and a connecting passage 4 communicating with the main bearing sealed chamber 5. A pipeline pressure measuring device 2 is connected to the connecting passage 4, and / or a cavity pressure measuring device 1 is connected to the connecting passage 4. The rotating shaft 63 is positioned and supported by the main bearing. This main bearing system possesses the technical features and benefits of the aforementioned pressure measurement system, which will not be further elaborated here.

[0079] In one embodiment, if Figures 1-10 As shown, the communication channel 4 includes a pressure measurement channel 41 and a grease injection channel 42 distributed along the circumferential direction. The communication channel 4 can be provided on the rotating shaft bearing mounting seat 64.

[0080] By successively installing the pipeline pressure measuring device 2 and the cavity pressure measuring device 1 in the pressure measuring channel 41, the pipe loss pressure of the connecting channel 4 can be measured; by respectively installing the pipeline pressure measuring device 2 in the pressure measuring channel 41 and the grease injection channel 42, the pressure at each point in the main bearing sealing cavity 5 can be measured.

[0081] The main bearing of the tunnel boring machine may include a plurality of rubber seals 62, forming a plurality of main bearing sealing cavities 5, such as Figure 9-10As shown, the main bearing of the tunnel boring machine is provided with three main bearing sealing chambers 5, namely: a first chamber 51, a second chamber 52 and a third chamber 53; one main bearing sealing chamber 5 is provided with a pressure measuring channel 41 and multiple grease injection channels 42. Preferably, as Figure 10 As shown, all the pressure measuring channels 41 and grease injection channels 42 are spaced apart and distributed along the same circumferential line.

[0082] In one embodiment, at least one communication channel 4 is connected to a third valve body 3, and the line pressure measuring device 2 and the cavity pressure measuring device 1 are each detachably connected to the third valve body 3. The third valve body 3 can be equivalent to the first valve body or the second valve body. That is, when the third valve body is provided on the communication channel 4, the cavity pressure measuring device 1 can omit the first valve body 18, and the line pressure measuring device 2 can omit the second valve body 23. When measuring the pressure at the port of the connection channel, the line pressure measuring device 2 can be installed through the third valve body; when measuring the pressure within the main bearing seal cavity 5, the cavity pressure measuring device 1 can be installed through the third valve body.

[0083] Option 3

[0084] The present invention provides a method for measuring the pressure of the main bearing sealing cavity of a tunnel boring machine, using the above-mentioned pressure measuring system for the main bearing sealing cavity of the tunnel boring machine, such as Figure 12 As shown, the pressure measurement method includes: step S1, where the pipeline pressure measuring device 2 measures the pressure at the port of the communication channel 4; and step S2, where the cavity pressure measuring device 1 measures the pressure within the main bearing seal cavity 5. This pressure measurement method accurately measures the grease pressure within the main bearing seal cavity 5, reducing interference caused by the long grease flow path in the main bearing seal cavity 5, which can lead to inaccurate and low-precision pressure measurements.

[0085] The order of steps S1 and S2 is not limited. Furthermore, the pressure measurement method further includes: step S3, where the pipeline pressure measuring device 2 monitors the pressures of the ports of the plurality of communication channels 4 and calculates the pressures at the corresponding plurality of points within the main bearing seal cavity 5, thereby comprehensively understanding the pressure state of the entire seal ring and enabling high-precision detection of the grease pressure distribution acting on the seal.

[0086] The above descriptions are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A pressure measurement system for a sealed cavity of a main bearing of a roadheader, wherein the main bearing of the roadheader is provided with a communication channel communicating with the sealed cavity of the main bearing, characterized in that: The pressure measurement system includes: a pipeline pressure measuring device and a cavity pressure measuring device; the pipeline pressure measuring device can be connected to the communication channel to measure the pressure of the port of the communication channel; The cavity pressure measuring device includes a support tube, a pressure measuring core, a core seat, a valve body connecting seat and a first valve body that can be connected to the port of the connecting channel. The core seat is arranged at the front end of the support tube, and the pressure measuring core is installed on the core seat. The support tube can be inserted into the connecting channel and the pressure measuring core is located in the main bearing sealing cavity; the valve body connecting seat is sleeved on the outside of the support tube, and the valve body connecting seat can be connected to the first valve body; the core seat and the entire pressure measuring core and at least a part of the support tube can pass through the first valve body.

2. The pressure measurement system for the main bearing sealing chamber of a roadheader according to claim 1, characterized in that: The core seat is provided with a connection structure for being detachably fixed to the main bearing sealing cavity.

3. The pressure measurement system for the main bearing sealing chamber of a roadheader according to claim 2, characterized in that: The connecting structure includes a locking nut.

4. The pressure measurement system for the main bearing sealing chamber of a roadheader according to claim 1, characterized in that: The valve body connecting seat is movably sleeved on the supporting tube.

5. The pressure measurement system for the main bearing sealing chamber of a roadheader according to claim 4, characterized in that: The front end surface of the valve body connecting seat is provided with an accommodating cavity capable of accommodating at least a portion of the core seat.

6. The pressure measurement system for the main bearing sealing chamber of a roadheader according to claim 1, characterized in that: The rear end of the support tube is provided with an electrical connector electrically connected to the pressure measuring core.

7. The pressure measurement system for the main bearing sealing chamber of a roadheader according to claim 1, characterized in that: The pipeline pressure measuring device includes a pressure sensor and a second valve body, the pressure sensor is connected to the second valve body, and the second valve body can be connected to the port of the communication channel so that the pressure sensor is connected to the communication channel through the second valve body.

8. The pressure measurement system for the main bearing sealing chamber of a roadheader according to claim 7, characterized in that: The pipeline pressure measuring device includes a pulse damper, and the pulse damper is connected to the second valve body.

9. A main bearing system for a roadheader, characterized in that: The main bearing system comprises a main bearing of a roadheader and a pressure measurement system for a sealed cavity of a main bearing of a roadheader according to any one of claims 1 to 8, wherein the main bearing of the roadheader is provided with a main bearing sealed cavity and a communication channel communicating with the main bearing sealed cavity; The pipeline pressure measuring device is connected to the communication channel, and / or the cavity pressure measuring device is connected to the communication channel.

10. The main bearing system of the roadheader according to claim 9, characterized in that: The communication channel includes a pressure measurement channel and a grease injection channel distributed along the circumferential direction.

11. The main bearing system of the roadheader according to claim 9, characterized in that: At least one of the communication channels is connected to a third valve body, and the pipeline pressure measuring device and the cavity pressure measuring device are respectively detachably connected to the third valve body.

12. A method for measuring the pressure of a main bearing sealing cavity of a tunnel boring machine, characterized in that: The pressure measurement system for the main bearing sealing chamber of a roadheader according to any one of claims 1 to 8 is adopted, wherein the pressure measurement method comprises: The pipeline pressure measuring device measures the pressure of the port of the communication channel; The cavity pressure measuring device measures the pressure in the main bearing sealing cavity.

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