Lip seal failure monitoring method and device

Abstract

The application provides a kind of lip seal failure monitoring method and device, failure monitoring method includes based on the early warning height of lip seal, obtain the first to be measured lip seal after aging test, the second to be measured lip seal after wear test;Compare the actual monitoring data of lip seal with the early warning data of first to be measured lip seal and / or second to be measured lip seal, judge whether lip seal is failure;The early warning data of first to be measured lip seal includes the radial data of waist of first to be measured lip seal under static sealing condition;The tangential data of waist of first to be measured lip seal under dynamic sealing condition;The early warning data of second to be measured lip seal includes the radial data of waist of second to be measured lip seal under static sealing condition;The tangential data of waist of second to be measured lip seal under dynamic sealing condition.The application also provides a kind of failure monitoring device;The above-mentioned device and method can solve the problem that the deformation condition of lip seal is not comprehensive.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a method and device for monitoring the failure of lip seals. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this invention and does not constitute prior art.

[0003] In the field of tunnel construction technology, the main drive structure of a tunnel boring machine (TBM) is a key component that drives the TBM cutterhead to break rocks and excavate. However, in the tunnel environment, the main drive structure faces a series of risks such as petroleum spills and liquid erosion. Therefore, the main drive seal is an important safeguard to protect the main drive structure from the impact of the rock-breaking environment. Currently, one function of the main drive seal is to prevent mud from entering the main bearing, and another function is to prevent the bearing lubricating oil and other materials used in the main bearing from leaking out of the main drive gear cavity. Real-time monitoring of the status of the main drive seal and providing corresponding leakage risk warnings is one of the key issues to be solved in this technical field.

[0004] The most common type of main drive for existing tunnel boring machines (TBMs) uses lip seals. Therefore, research on monitoring technology for main drive seals generally revolves around the characteristics of lip seals. Currently, the failure manifestation of main drive lip seals under harsh working conditions is generally wear failure. Harsh working conditions generally refer to the main drive lip seals installed near the outside being subjected to wear from rock particles in the mud. Lip seals installed near the inside of the main drive, due to their better environment and lubrication conditions, generally fail mainly due to aging deformation and loss of resilience. Therefore, some monitoring technologies have emerged to address this deformation. For example, stress sensing plates are installed at the contact point of the lip seal to detect whether failure has occurred by monitoring whether the stress applied to the lip is zero. However, this device carries the risk of monitoring failure due to friction between the contact surfaces. Other methods monitor the failure of the lip seal by changing the resistance value between the resistance wire on the lip seal and the circuit board in contact with the lip. However, this method still carries the risk of friction failure. Therefore, choosing a monitoring method that can more accurately, sensitively, efficiently, and comprehensively monitor the failure of lip seals is a problem that needs to be solved by those skilled in the art.

[0005] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0006] The purpose of this invention is to provide a method and device for monitoring the failure of lip seals, which solves the problem of incomplete and inaccurate monitoring of the deformation of lip seals in the field of tunnel construction technology.

[0007] The above-mentioned objectives of this invention are mainly achieved by the following technical solutions:

[0008] This invention provides a method for monitoring the failure of lip seals, comprising:

[0009] Based on the warning height of the lip seal, the first lip seal to be tested after the aging test and the second lip seal to be tested after the wear test are obtained;

[0010] By comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test, it is determined whether the lip seal has failed.

[0011] The warning data for the first lip seal under test includes: radial data of the waist of the first lip seal under test under static sealing conditions; and tangential data of the waist of the first lip seal under test under dynamic sealing conditions.

[0012] The warning data for the second lip seal under test includes: radial data of the waist of the second lip seal under static sealing conditions; and tangential data of the waist of the second lip seal under dynamic sealing conditions.

[0013] In one specific embodiment, comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed includes:

[0014] The actual monitoring data of the lip seal includes the actual radial force and the actual tangential force at the waist.

[0015] The waist tangential data and waist radial data of the first lip seal under test are the first waist tangential force and the first waist radial force, respectively;

[0016] If the actual radial force at the waist is less than the first radial force at the waist; and / or, if the actual tangential force at the waist is less than the first tangential force at the waist, then the lip seal is determined to be faulty.

[0017] In one specific embodiment, comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed includes:

[0018] The actual monitoring data of the lip seal includes the actual radial force and the actual tangential force at the waist.

[0019] The waist tangential data and waist radial data of the second lip seal under test are the second waist tangential force and the second waist radial force, respectively;

[0020] If the actual radial force at the waist is less than the second radial force at the waist; and / or, if the actual tangential force at the waist is less than the second tangential force at the waist, then the lip seal is determined to be faulty.

[0021] In one specific embodiment, comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed includes:

[0022] Obtain the waist tangential data of the first lip seal under test and the weighted tangential data of the waist tangential data of the second lip seal under test;

[0023] Obtain the waist radial data of the first lip seal under test and the weighted radial data of the waist radial data of the second lip seal under test;

[0024] By comparing the actual monitoring data with the weighted tangential data and / or the weighted radial data, it is determined whether the lip seal has failed.

[0025] In one specific embodiment, the actual monitoring data of the lip seal includes the actual radial force and the actual tangential force at the waist.

[0026] The weighted tangential data is the weighted tangential force, and the weighted radial data is the weighted radial force;

[0027] If the actual radial force at the waist is less than the weighted radial force; and / or, if the actual tangential force at the waist is less than the weighted tangential force, then the lip seal is determined to be faulty.

[0028] In one specific embodiment, obtaining the waist radial data of the first lip seal to be tested and the weighted radial data of the waist radial data of the second lip seal to be tested includes:

[0029] Determine a first weighting ratio for the waist radial data of the first lip seal to be tested, and a second weighting ratio for the waist radial data of the second lip seal to be tested;

[0030] Specifically, under the condition that the oil contains slag and stone, the first weight ratio is 0-0.3 and the second weight ratio is 0.3-1; under the condition that the oil does not contain slag and stone or the slag and stone content is less than 10%, the first weight ratio is 0-0.9 and the second weight ratio is 0.9-1; under the condition that the oil does not contain slag and stone or the slag and stone content is greater than 90%, the first weight ratio is 0-0.1 and the second weight ratio is 0.1-1.

[0031] In one specific embodiment, obtaining the waist tangential data of the first lip seal under test and the weighted tangential data of the waist tangential data of the second lip seal under test includes:

[0032] The third weighting ratio of the waist tangential data of the first lip seal under test and the fourth weighting ratio of the waist tangential data of the second lip seal under test are determined.

[0033] Specifically, in the case where the oil contains slag and stone, the third weighting ratio is 0-0.3 and the fourth weighting ratio is 0.3-1; in the case where the oil does not contain slag and stone or the slag and stone content is less than 10%, the third weighting ratio is 0-0.9 and the fourth weighting ratio is 0.9-1; and in the case where the oil does not contain slag and stone or the slag and stone content is greater than 90%, the third weighting ratio is 0-0.1 and the fourth weighting ratio is 0.1-1.

[0034] In one specific embodiment, based on the warning height of the lip seal, the first lip seal to be tested after the aging test is obtained, including:

[0035] The lip seal is compressed at an aging temperature of 60℃-150℃ and maintained for an aging time. Then, the external force on the lip seal is removed at room temperature and the seal is allowed to recover for 12 hours. The recovery height of the lip seal at the aging time is then obtained.

[0036] Based on the aging temperature, the aging time, and the recovery height, extrapolate the warning temperature and warning time of the lip seal at the warning height;

[0037] Based on the warning temperature and the warning time, an aging test is conducted on the lip-shaped seal to obtain the first lip-shaped seal to be tested.

[0038] In one specific embodiment, based on the warning height of the lip seal, a second lip seal to be tested after the wear test is obtained, comprising:

[0039] When the online speed is 0m / s-8m / s, the lip edge of the lip seal is tangentially worn until the height of the lip seal reaches the warning height, thus obtaining the second lip seal to be tested.

[0040] This invention provides a lip seal failure monitoring device, comprising:

[0041] The test unit, based on the warning height of the lip seal, obtains the first lip seal to be tested after the aging test and the second lip seal to be tested after the wear test;

[0042] The comparison unit compares the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed.

[0043] The warning data for the first lip seal under test includes: radial data of the waist of the first lip seal under test under static sealing conditions; and tangential data of the waist of the first lip seal under test under dynamic sealing conditions.

[0044] The warning data for the second lip seal under test includes: radial data of the waist of the second lip seal under static sealing conditions; and tangential data of the waist of the second lip seal under dynamic sealing conditions.

[0045] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0046] Typically, stress changes in a lip seal are reflected in its waist area. This invention, by installing flexible strain gauges in the waist area of ​​the lip seal, monitors the radial stress value of the lip seal when it is compressed within the sealing groove of the main drive. Simultaneously, it monitors the tangential stress value generated when the lip of the lip seal rubs against the shaft of the main drive, achieving more comprehensive and accurate feedback on the deformation degree of the lip seal and determining whether it has failed. Furthermore, it can quickly output alarm information, facilitating timely seal replacement by construction personnel and preventing the main drive from being affected by internal leaks or external mud intrusion. Attached Figure Description

[0047] Figure 1 This is a flowchart of the lip seal failure monitoring method of the present invention;

[0048] Figure 2 This is a flowchart of the first embodiment of the lip seal failure monitoring method of the present invention;

[0049] Figure 3 This is a flowchart of a second embodiment of the lip seal failure monitoring method of the present invention;

[0050] Figure 4 This is a flowchart of an embodiment of step S2 of the lip seal failure monitoring method of the present invention;

[0051] Figure 5 This is a flowchart of an embodiment of step S1 of the lip seal failure monitoring method of the present invention;

[0052] Figure 6 This is a block diagram of a lip seal failure monitoring device according to the present invention;

[0053] Figure 7 This is a schematic diagram of the lip seal failure monitoring device of the present invention installed on the main drive;

[0054] Figure 8 This is a schematic diagram of the structure of the first lip seal to be tested in the lip seal failure monitoring method of the present invention;

[0055] Figure 9 This is a schematic diagram of the structure of the second lip seal to be tested in the lip seal failure monitoring method of the present invention.

[0056] Explanation of reference numerals in the attached figures:

[0057] 1. Lip seal; 11. Radial strain monitoring structure; 12. Tangential strain monitoring structure;

[0058] 21. Main drive seal groove; 22. Main drive seal runway;

[0059] 3. The first lip seal to be tested;

[0060] 4. The second lip seal to be tested;

[0061] D. Radial direction of the main drive;

[0062] F. Axial direction of the main drive. Detailed Implementation

[0063] 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.

[0064] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings herein are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0065] 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.

[0066] 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.

[0067] Implementation Method 1

[0068] like Figure 1 The diagram shows a flowchart of a lip seal failure monitoring method according to the present invention, comprising:

[0069] Step S1: Based on the warning height of the lip seal 1, the first lip seal 3 to be tested after the aging test and the second lip seal 4 to be tested after the wear test are obtained;

[0070] Step S2: Compare the actual monitoring data of lip seal 1 with the warning data of the first lip seal 3 and / or the second lip seal 4 to determine whether lip seal 1 has failed.

[0071] The warning data for the first lip seal 3 to be tested includes: radial data of the waist of the first lip seal 3 under static sealing conditions; and tangential data of the waist of the first lip seal 3 under dynamic sealing conditions.

[0072] The warning data for the second lip seal 4 to be tested includes: radial data of the waist of the second lip seal 4 to be tested under static sealing conditions; and tangential data of the waist of the second lip seal 4 to be tested under dynamic sealing conditions.

[0073] The lip seal failure monitoring method provided by this invention first analyzes the installation position of the lip seal 1 to determine that, due to sealing installation requirements, the lip seal 1 will deform in the radial direction D along the main drive sealing track 22 during the static sealing stage and in the tangential direction along the main drive sealing track 22 during the dynamic sealing stage. Combining this with the specific shape of the lip seal 1, it is determined that the deformation of the lip seal 1 in both directions will manifest as deformation in the waist portion of the lip seal 1. Therefore, the inventors discovered that by establishing a radial strain monitoring structure 11 and a tangential strain monitoring structure 12 in the waist portion of the lip seal 1, the degree of deformation in the waist portion of the lip seal 1 can be directly monitored. Using radial strain monitoring structures 11 and tangential strain monitoring structures 12 in two directions in the waist portion to monitor the actual state of the lip seal 1 improves the sensitivity and accuracy of failure monitoring, provides a more comprehensive monitoring of the deformation degree of the lip seal 1, and thus avoids the risk of failure without alarm.

[0074] The inventors further discovered that the failure of the lip seal 1 mainly stems from aging failure when there is less slag in the sealing environment, and / or wear failure when there is more slag in the sealing environment. To establish a correspondence between the deformation degree of the waist of the lip seal 1 and its failure state, this application first obtains the warning height of the lip seal 1 using existing empirical statistical methods and simulation analysis. When the natural height of the lip seal 1 is lower than the warning height, the lip seal 1 is in a critical failure state. Furthermore, this method employs aging and wear experiments to obtain the first lip seal 3 and the second lip seal 4, which are at the warning height after the two experiments, respectively. Warning data for the first lip seal 3 and the second lip seal 4 are obtained. Finally, the actual monitoring data of the lip seal 1 is compared in real time with the warning data of the first lip seal 3 and / or the second lip seal 4 to determine whether the lip seal 1 has failed and to replace it in a timely manner. Using this lip seal failure monitoring method to monitor the failure status of lip seal 1 is beneficial for achieving real-time monitoring and for timely replacement of seals at risk of failure, thus avoiding the risk of oil leakage.

[0075] For details, please refer to the following: Figure 7As shown, multiple lip seals 1 are fitted inside the main drive sealing groove 21, and the multiple lip seals 1 are spaced apart along the axial direction F of the main drive. The multiple lip seals 1 are arranged in the same direction and / or opposite directions, and the lip edge of the lip seal 1 abuts against the main drive sealing track 22. Under the condition of static sealing, the waist of the lip seal 1 abuts against the main drive sealing track 22 by deforming along the radial direction D of the main drive sealing track 22, which is used to seal the circumferential gap of the main drive sealing track 22. Under the condition of dynamic sealing, the main drive sealing track 22 rotates, and the waist of the lip seal 1 abuts against the main drive sealing track 22 by deforming along the tangential direction of the main drive sealing track 22, which is used to seal the circumferential gap of the main drive sealing track 22, so as to avoid oil leakage due to excessive deformation. In this embodiment, the radial strain monitoring structure 11 is disposed at the waist of the lip seal 1 along the radial direction D of the main drive sealing track 22, and the tangential strain monitoring structure 12 is disposed at the waist of the lip seal 1 along the tangential direction of the main drive sealing track 22. In other embodiments, the device for monitoring the waist deformation of the lip seal 1 can also be an integrated monitoring device, and the integrated monitoring device is disposed at the waist of the lip seal 1. There are no specific restrictions on the form of the monitoring device.

[0076] See also Figure 7 As shown, at the end of the main drive sealing groove 21 near the cutter head, the oil in the main drive sealing groove 21 has a high content of slag and gravel. When the lip seal 1 in the end of the main drive sealing groove 21 near the cutter head is in a state of just failing, the lip seal 1 abuts against the main drive sealing track 22. Under dynamic sealing conditions, the waist of the lip seal 1 deforms in the tangential direction along the main drive sealing track 22, but the deformation of the waist of the lip seal 1 cannot provide the lip seal 1 with a sufficient size of radial deformation along the main drive sealing track 22. The oil leaks from the contact point between the lip seal 1 and the main drive sealing track 22 due to the contact force in the direction D. The failure of the lip seal 1 in the main drive sealing groove 21 near the cutter head is mainly due to the wear of the lip seal 1, that is, the wear of the lip edge of the lip seal 1, which causes the height of the lip seal 1 to become shorter. When the height of the lip seal 1 is less than the warning height of the lip seal 1, the contact force between the lip seal 1 and the main drive sealing track 22 in the radial direction D of the main drive sealing track 22 cannot achieve sealing.

[0077] See also Figure 7As shown, at the end of the main drive sealing groove 21 away from the cutter head, the oil in the main drive sealing groove 21 contains less slag and stone. When the lip seal 1 at the end of the main drive sealing groove 21 away from the cutter head is in a state of just failing, the lip seal 1 abuts against the main drive sealing track 22. Under static sealing conditions, the waist of the lip seal 1 deforms in the radial direction along the main drive sealing track 22, but the deformation of the waist of the lip seal 1 cannot provide the lip seal 1 with a sufficient size of deformation along the main drive sealing track 22. The oil leaks from the contact point between the lip seal 1 and the main drive sealing track 22 due to the radial force D of the track 22. The failure of the lip seal 1 at the end of the main drive sealing groove 21 away from the cutter head is mainly due to aging of the lip seal 1, i.e., reduced elasticity caused by material aging. When the height of the lip seal 1 is less than its warning height, the contact force between the lip seal 1 and the main drive sealing track 22 in the radial direction D of the main drive sealing track 22 cannot achieve sealing. In summary, the failure modes of the lip seal 1 are mainly divided into aging failure and wear failure.

[0078] See also Figure 1 As shown, the lip seal failure monitoring method provided by this invention, to achieve the purpose of failure monitoring, firstly obtains the warning height of the lip seal 1 based on empirical statistical methods and / or, based on experiments combined with simulation analysis; further, in order to establish a data comparison relationship between the strain values ​​monitored by the radial strain monitoring structure 11 and the tangential strain monitoring structure 12 and the warning height of the lip seal 1, this lip seal failure monitoring method, based on the warning height of the lip seal 1, uses aging experiments to obtain the first lip seal 3 to be tested and its warning data, and uses wear experiments to obtain the second lip seal 4 to be tested and its warning data. The alarm data includes: under static sealing conditions, the radial data of the waist of the first lip seal 3 to be tested is compared with the data obtained by the radial strain monitoring structure 11; under dynamic sealing conditions, the tangential data of the waist of the first lip seal 3 to be tested is compared with the data obtained by the tangential strain monitoring structure 12; under static sealing conditions, the radial data of the waist of the second lip seal 4 to be tested is compared with the data obtained by the radial strain monitoring structure 11; under dynamic sealing conditions, the tangential data of the waist of the second lip seal 4 to be tested is compared with the data obtained by the tangential strain monitoring structure 12.

[0079] See also Figure 5 and Figure 8 As shown, in a specific embodiment, based on the warning height of the lip seal 1, the first lip seal 3 to be tested after the aging test is obtained, including:

[0080] Step S11: Compress the lip seal 1 at an aging temperature of 60℃-150℃ and maintain the aging time. Then, remove the external force on the lip seal 1 at room temperature and allow it to recover for 12 hours. Obtain the recovery height of the lip seal 1 after the aging time.

[0081] Step S12: Based on the aging temperature, aging time, and recovery height, extrapolate the warning temperature and warning time of the lip seal 1 at the warning height;

[0082] Step S13: Based on the warning temperature and warning time, an aging test is conducted on the lip seal 1 to obtain the first lip seal 3 to be tested.

[0083] The aging experiment provided in this embodiment can quickly obtain the first lip seal 3 under test after aging failure, as well as the waist radial data and waist tangential data of the first lip seal 3 under test, so as to quickly obtain early warning data for a new batch of lip seals 1 and establish a failure monitoring system.

[0084] Specifically, in step S11, the lip seal 1 is compressed to the height of the main drive sealing groove 21. Next, the aging temperature is set, and the lip seal 1 is kept at the aging temperature for a specific aging time. Further, the compression of the lip seal 1 is then removed at room temperature, and after 12 hours of recovery, the recovery height is measured.

[0085] In one specific embodiment, based on step S12, the aging temperature can be set to be the same as the warning temperature, and the warning time can be extrapolated according to the following formula:

[0086]

[0087] in,

[0088]

[0089]

[0090] In the formula, t1: warning time, s; t2: aging time, s; ε: degree of compression set; ε C h0: Initial height of lip seal 1, mm; h1: Recovery height of lip seal 1, mm; h s : Height of main drive sealing groove 21, mm; h C Warning height of lip seal 1, mm.

[0091] In step S13, based on the warning time t1 and the aging time t2, under the condition of the warning temperature, the lip seal 1 is compressed and held for t1-t2 time to obtain the first lip seal 3 after aging failure.

[0092] In another specific embodiment, step S12 can also obtain the warning temperature and warning time by extrapolation, wherein the extrapolation method is shown in the following formula:

[0093] The compression set pattern of lip seal 1 after aging:

[0094]

[0095] in,

[0096] 1-ε=Bexp(-Kt α )

[0097]

[0098]

[0099] In the formula, ζ: degree of compression set; B: experimental constant; K: aging rate constant of polymer material; p: number of aging temperatures; K(T): reaction rate constant, min -1 t: heating time, s; α: empirical constant; A: exponential factor, min -1 E: activation energy, J / mol; R: molar gas constant, 8.314 J / (mol·K); T: thermodynamic temperature, K.

[0100] The experimental constant B, empirical constant α, exponential factor A, activation energy E, and polymer aging rate constant K in the formula can be derived from the above formula.

[0101] Regarding the above formula, the warning height h of the lip seal 1 is also considered. C Obtain the warning height h of the lip seal 1. C Under the condition of ε, the degree of compression set of lip seal 1 C The specific formula is as follows:

[0102]

[0103] In the formula, ε C h0: Initial height of lip seal 1, mm; h s : Height of main drive sealing groove 21, mm; h C Warning height of lip seal 1, mm.

[0104] Based on the above formulas (1) and (2), the degree of compressive permanent deformation ε at which the warning height is reached can be obtained according to the set aging temperature T. C The required heating time t.

[0105] In step S13, under the condition of aging temperature T, the lip seal 1 is compressed and heated for a time t to obtain the first lip seal 3 after aging failure; in other embodiments, the specific method of aging test is not limited.

[0106] See also Figure 9 As shown, in a specific embodiment, based on the warning height of the lip seal 1, the second lip seal 4 to be tested after the wear test is obtained, including:

[0107] Step S14: When the online speed is 0m / s-8m / s, the lip edge of the lip seal 1 is tangentially worn until the height of the lip seal 1 reaches the warning height, thus obtaining the second lip seal 4 to be tested.

[0108] The wear test provided in this embodiment can quickly obtain the second lip seal 4 under test after wear failure, as well as the waist radial data and waist tangential data of the second lip seal 4 under test, so as to quickly obtain early warning data for a new batch of lip seals 1 and establish a failure monitoring system.

[0109] Specifically, the working linear speed range of the wear tool is 0m / s-8m / s. After selecting the working linear speed of the wear tool, the wear tool performs wear operation on the lip edge of the lip seal 1 along the tangential direction of the bottom of the lip seal 1 at the working linear speed until the height of the lip seal 1 is reduced to the warning height of the lip seal 1, thus obtaining the second lip seal 4 to be tested. In other embodiments, the specific method of the wear test is not limited.

[0110] See also Figure 1As shown, in step S2, the actual monitoring data of the lip seal 1 is compared with the warning data of the first lip seal 3 to be tested to determine whether the lip seal 1 has failed. In this embodiment, the data acquired by the radial strain monitoring structure 11 and the data of the waist radial data of the first lip seal 3 to be tested are of the effective deformation degree along the radial direction D of the main drive sealing track 22. The data acquired by the tangential strain monitoring structure 12 and the data of the waist tangential data of the first lip seal 3 to be tested are of the effective deformation degree along the tangential direction of the main drive sealing track 22. In other embodiments, the data acquired by the radial strain monitoring structure 11... The data type of the radial data of the waist of the first lip seal 3 to be tested can also be the magnitude of the deformation force in the radial direction D along the main drive sealing track 22. The data type of the tangential data of the waist of the first lip seal 3 to be tested acquired by the tangential strain monitoring structure 12 can also be the magnitude of the deformation force in the tangential direction along the main drive sealing track 22. There are no specific restrictions on the data types of the radial strain monitoring structure 11, the tangential strain monitoring structure 12, the radial data of the waist of the first lip seal 3 to be tested, and the tangential data of the waist of the first lip seal 3 to be tested, but they should still be consistent.

[0111] See also Figure 1 As shown, in step S2, the actual monitoring data of the lip seal 1 is compared with the warning data of the second lip seal 4 to be tested to determine whether the lip seal 1 has failed. In this embodiment, the data acquired by the radial strain monitoring structure 11 and the data of the waist radial data of the second lip seal 4 to be tested are of the effective deformation degree along the radial direction D of the main drive sealing track 22. The data acquired by the tangential strain monitoring structure 12 and the data of the waist tangential data of the second lip seal 4 to be tested are of the effective deformation degree along the tangential direction of the main drive sealing track 22. In other embodiments, the data acquired by the radial strain monitoring structure 11... The data types of the radial data of the waist of the second lip seal 4 under test can also be the magnitude of the deformation force in the radial direction D along the main drive sealing track 22. The data types of the data acquired by the tangential strain monitoring structure 12 and the tangential data of the waist of the second lip seal 4 under test can also be the magnitude of the deformation force in the tangential direction along the main drive sealing track 22. There are no specific restrictions on the data types of the radial strain monitoring structure 11, the tangential strain monitoring structure 12, the radial data of the waist of the second lip seal 4 under test, and the tangential data of the waist of the second lip seal 4 under test, but they must remain consistent.

[0112] In one specific embodiment, such as Figure 2 As shown, by comparing the actual monitoring data of lip seal 1 with the warning data of the first lip seal 3 and / or the second lip seal 4 under test, it is determined whether lip seal 1 has failed, including:

[0113] Step S21:

[0114] The actual monitoring data of the lip seal 1 includes the actual radial force and the actual tangential force at the waist.

[0115] The waist tangential data and waist radial data of the first lip seal 3 to be tested are the first waist tangential force and the first waist radial force, respectively;

[0116] If the actual radial force of the waist is less than the first radial force of the waist; and / or, if the actual tangential force of the waist is less than the first tangential force of the waist, then the lip seal 1 is deemed to have failed.

[0117] The data type of the monitoring data in this invention adopts the form of force. By directly comparing the magnitude of the radial force of the actual waist with the magnitude of the radial force of the first waist, and comparing the magnitude of the tangential force of the actual waist with the magnitude of the tangential force of the first waist, the aging failure state of the lip seal 1 can be quickly evaluated and failure alarm information can be output.

[0118] Specifically, the actual monitoring data of the lip seal 1 includes the actual radial force and the actual tangential force of the waist. That is, in this embodiment, the data obtained by the radial strain monitoring structure 11 is the actual radial force of the waist, the data obtained by the tangential strain monitoring structure 12 is the actual tangential force of the waist, the radial force of the waist of the first lip seal 3 to be tested is the first radial force of the waist, and the tangential force of the waist of the first lip seal 3 to be tested is the first tangential force of the waist.

[0119] In real-time monitoring, the actual lumbar radial force is compared with the first lumbar radial force. When the actual lumbar radial force is less than the first lumbar radial force, an alarm is output. And / or, the actual lumbar tangential force is compared with the first lumbar tangential force. When the actual lumbar tangential force is less than the first lumbar tangential force, an alarm is output.

[0120] In another specific embodiment, such as Figure 3 As shown, by comparing the actual monitoring data of lip seal 1 with the warning data of the first lip seal 3 and / or the second lip seal 4 under test, it is determined whether lip seal 1 has failed, including:

[0121] Step S22:

[0122] The actual monitoring data of the lip seal 1 includes the actual radial force and the actual tangential force at the waist.

[0123] The waist tangential data and waist radial data of the second lip seal 4 to be tested are the second waist tangential force and the second waist radial force, respectively.

[0124] If the actual radial force of the waist is less than the radial force of the second waist; and / or, if the actual tangential force of the waist is less than the tangential force of the second waist, then the lip seal 1 is deemed to have failed.

[0125] The data type of the monitoring data in this invention adopts the form of force. By directly comparing the magnitude of the radial force of the actual waist with the radial force of the second waist, and comparing the magnitude of the tangential force of the actual waist with the tangential force of the second waist, the wear failure state of the lip seal 1 can be quickly evaluated and failure alarm information can be output.

[0126] Specifically, the actual monitoring data of the lip seal 1 includes the actual radial force and the actual tangential force of the waist. That is, in this embodiment, the data obtained by the radial strain monitoring structure 11 is the actual radial force of the waist, and the data obtained by the tangential strain monitoring structure 12 is the actual tangential force of the waist. The radial force data of the waist of the second lip seal 4 to be tested is the first radial force of the waist, and the tangential force data of the waist of the second lip seal 4 to be tested is the first tangential force of the waist.

[0127] In real-time monitoring, the actual lumbar radial force is compared with the second lumbar radial force. When the actual lumbar radial force is less than the second lumbar radial force, an alarm is output. And / or, the actual lumbar tangential force is compared with the second lumbar tangential force. When the actual lumbar tangential force is less than the second lumbar tangential force, an alarm is output.

[0128] In yet another specific embodiment, such as Figure 4 As shown, by comparing the actual monitoring data of lip seal 1 with the warning data of the first lip seal 3 and / or the second lip seal 4 under test, it is determined whether lip seal 1 has failed, including:

[0129] Step S231: Obtain the waist tangential data of the first lip seal 3 to be tested and the weighted tangential data of the waist tangential data of the second lip seal 4 to be tested;

[0130] Step S232: Obtain the waist radial data of the first lip seal 3 to be tested, and the weighted radial data of the waist radial data of the second lip seal 4 to be tested;

[0131] Step S233: Compare the actual monitoring data with the weighted tangential data and / or weighted radial data to determine whether the lip seal 1 has failed.

[0132] The lip seal failure monitoring method of the present invention adopts a method of generating early warning data by combining the waist data of the first lip seal 3 to be tested and the waist data of the second lip seal 4 to be tested according to a certain weight ratio. That is, the influence ratio of aging failure and wear failure is evaluated based on the installation position of the lip seal 1 in the main drive sealing groove 21 and the content of slag in the oil at the location. The weight ratio of the early warning data of the first lip seal 3 to be tested and the early warning data of the second lip seal 4 to be tested is set to more comprehensively determine whether the lip seal 1 has failed.

[0133] Specifically, in step S231, the waist tangential data of the first lip seal 3 to be tested and the waist tangential data of the second lip seal 4 to be tested are first combined according to a certain weight ratio to form weighted tangential data. In this embodiment, the data type of the waist tangential data of the first lip seal 3 to be tested, the waist tangential data of the second lip seal 4 to be tested, and the weighted tangential data is the deformation force along the tangential direction of the main drive sealing track 22. In other embodiments, the data type can also be the effective deformation degree along the tangential direction of the main drive sealing track 22, and there is no specific limitation on this.

[0134] Specifically, in step S232, the waist radial data of the first lip seal 3 to be tested and the waist radial data of the second lip seal 4 to be tested are first combined according to a certain weight ratio to form weighted radial data. In this embodiment, the data type of the waist radial data of the first lip seal 3 to be tested, the waist radial data of the second lip seal 4 to be tested, and the weighted radial data is the deformation force along the radial direction of the main drive sealing track 22. In other embodiments, the data type can also be the effective deformation degree along the radial direction of the main drive sealing track 22, and there is no specific limitation on this.

[0135] Specifically, in step S233, under real-time monitoring, the data acquired by the radial strain monitoring structure 11 is compared with the weighted radial data. When the data acquired by the radial strain monitoring structure 11 is less than the weighted radial data, an alarm is output. And / or, the data acquired by the tangential strain monitoring structure 12 is compared with the weighted tangential data. When the data acquired by the tangential strain monitoring structure 12 is less than the weighted tangential data, an alarm is output.

[0136] In one specific embodiment, the actual monitoring data of the lip seal 1 includes the actual radial force and the actual tangential force at the waist.

[0137] The weighted tangential data represents the weighted tangential force, and the weighted radial data represents the weighted radial force.

[0138] If the actual radial force at the waist is less than the weighted radial force; and / or, if the actual tangential force at the waist is less than the weighted tangential force, then the lip seal 1 is deemed to have failed.

[0139] In this embodiment, the actual monitoring data of the lip seal 1 will display the radial and tangential data of the waist of the lip seal 1 using the data types of actual waist radial force and actual waist tangential force, respectively. The weighted tangential data and weighted radial data of the lip seal 1 will be displayed using the data types of weighted tangential force and weighted radial force, respectively, which can be achieved quickly and intuitively.

[0140] In real-time monitoring, the actual lumbar radial force is compared with the weighted radial force. When the actual lumbar radial force is less than the weighted radial force, an alarm is output. And / or, the actual lumbar tangential force is compared with the weighted tangential force. When the actual lumbar tangential force is less than the weighted tangential force, an alarm is output.

[0141] In one specific embodiment, obtaining the waist radial data of the first lip seal 3 to be tested and the weighted radial data of the waist radial data of the second lip seal 4 to be tested includes:

[0142] Step S2321: Determine the first weighting ratio of the waist radial data of the first lip seal 3 to be tested, and the second weighting ratio of the waist radial data of the second lip seal 4 to be tested;

[0143] Specifically, under the condition that the oil contains slag and stone, the first weighting ratio is 0-0.3 and the second weighting ratio is 0.3-1; under the condition that the oil does not contain slag and stone or the slag and stone content is less than 10%, the first weighting ratio is 0-0.9 and the second weighting ratio is 0.9-1; under the condition that the oil does not contain slag and stone or the slag and stone content is greater than 90%, the first weighting ratio is 0-0.1 and the second weighting ratio is 0.1-1.

[0144] Based on the installation position of the lip seal 1 in the main drive sealing groove 21 and the content of slag in the oil at that position, combined with engineering experience, this invention sets the influence ratio of two failure modes, namely aging failure and wear failure, that is, the range of the first weight ratio and the second weight ratio. Then, under static sealing conditions, the specific value of the weighted radial data is determined, so as to achieve a more comprehensive evaluation of the failure state.

[0145] Specifically, under static sealing conditions, the weight ratio of the radial data of the waist of the first tested lip seal 3 that failed due to aging is the first weight ratio, and the weight ratio of the radial data of the waist of the second tested lip seal 4 that failed due to wear is the second weight ratio. The weighted radial data are then:

[0146] Weighted radial data = First weighting ratio × Waist radial data of the first tested lip seal 3 + Second weighting ratio

[0147] × Radial data of the waist of the second lip seal 4 to be tested

[0148] In another specific embodiment, the weighted tangential data for obtaining the waist tangential data of the first lip seal 3 to be tested and the waist tangential data of the second lip seal 4 to be tested includes:

[0149] The third weighting ratio of the waist tangential data of the first lip seal 3 to be tested and the fourth weighting ratio of the waist tangential data of the second lip seal 4 to be tested are determined.

[0150] Specifically, in the case where the oil contains slag and stone, the third weighting ratio is 0-0.3 and the fourth weighting ratio is 0.3-1; in the case where the oil does not contain slag and stone or the slag and stone content is less than 10%, the third weighting ratio is 0-0.9 and the fourth weighting ratio is 0.9-1; and in the case where the oil does not contain slag and stone or the slag and stone content is greater than 90%, the third weighting ratio is 0-0.1 and the fourth weighting ratio is 0.1-1.

[0151] Based on the installation position of the lip seal 1 in the main drive sealing groove 21 and the content of slag in the oil at that position, combined with engineering experience, this invention sets the influence ratio of two failure modes, namely aging failure and wear failure, that is, the range of the first weight ratio and the second weight ratio. In this way, the specific value of the weight tangential data under dynamic sealing conditions is determined, so as to achieve a more comprehensive evaluation of the failure state.

[0152] Specifically, under dynamic sealing conditions, the weight ratio of the waist tangential data of the first tested lip seal 3 that failed due to aging is the third weight ratio, and the weight ratio of the waist tangential data of the second tested lip seal 4 that failed due to wear is the fourth weight ratio. The weighted tangential data are as follows:

[0153] Weighted tangential data = Third weighting ratio × Waist tangential data of the first tested lip seal 3 + Fourth weighting ratio

[0154] × Tangential data of the waist of the second lip seal 4 under test

[0155] In other embodiments, the calculation method for weighted tangential data and weighted radial data is not limited to this.

[0156] Based on the same inventive concept, such as Figure 6 As shown, the present invention also provides a lip seal failure monitoring device, as in the above embodiment, specifically including:

[0157] The test unit, based on the warning height of the lip seal 1, obtains the first lip seal 3 after the aging test and the second lip seal 4 after the wear test;

[0158] The comparison unit compares the actual monitoring data of the lip seal 1 with the warning data of the first lip seal 3 and / or the second lip seal 4 to determine whether the lip seal 1 has failed.

[0159] The warning data for the first lip seal 3 to be tested includes: radial data of the waist of the first lip seal 3 under static sealing conditions; and tangential data of the waist of the first lip seal 3 under dynamic sealing conditions.

[0160] The warning data for the second lip seal 4 to be tested includes: radial data of the waist of the second lip seal 4 to be tested under static sealing conditions; and tangential data of the waist of the second lip seal 4 to be tested under dynamic sealing conditions.

[0161] The lip seal failure monitoring method provided by this invention can directly determine the state of the lip seal 1 by comparing the actual monitoring data of the lip seal 1 with the warning data of the first lip seal 3 and / or the second lip seal 4 under test. Simultaneously, aging tests and wear tests can be used to simulate the causes most likely to cause failure at the installation location of the lip seal 1, and the first lip seal 3 under test after aging failure and the second lip seal 4 under test after wear failure can be obtained experimentally. Furthermore, this lip seal failure monitoring method decomposes the deformation degree of the waist of the failed lip seal 1 into waist radial data and waist tangential data, which can divide the comparative data for judging failure, facilitating the comparison and judgment of the actual monitoring data of the lip seal 1.

[0162] Implementation Method 2

[0163] like Figure 6 The diagram shown is a block diagram of a lip seal failure monitoring device according to the present invention. This application also provides a lip seal failure monitoring device, comprising:

[0164] The test unit, based on the warning height of the lip seal, obtains the first lip seal to be tested after the aging test and the second lip seal to be tested after the wear test;

[0165] The comparison unit compares the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed.

[0166] The warning data for the first lip seal under test includes: radial data of the waist of the first lip seal under test under static sealing conditions; and tangential data of the waist of the first lip seal under test under dynamic sealing conditions.

[0167] The warning data for the second lip seal under test includes: radial data of the waist of the second lip seal under static sealing conditions; and tangential data of the waist of the second lip seal under dynamic sealing conditions. The lip seal failure monitoring device provided by this invention first analyzes the installation position of the lip seal 1 to determine that, due to sealing installation requirements, the lip seal 1 will undergo deformation in the radial direction D along the main drive sealing track 22 during the static sealing stage and deformation in the tangential direction along the main drive sealing track 22 during the dynamic sealing stage. Combining this with the specific shape of the lip seal 1, it is determined that the deformation of the lip seal 1 in both directions will manifest as deformation in the waist of the lip seal 1. Therefore, the inventors discovered that by establishing a radial strain monitoring structure 11 and a tangential strain monitoring structure 12 in the waist of the lip seal 1, the degree of deformation in the waist of the lip seal 1 can be directly monitored. By employing radial strain monitoring structures 11 and tangential strain monitoring structures 12 in two directions at the waist, the actual state of the lip seal 1 can be monitored. This helps to improve the sensitivity and accuracy of failure monitoring, and to more comprehensively monitor the degree of deformation of the lip seal 1, thereby avoiding the risk of failure without alarm.

[0168] The inventors further discovered that the failure of the lip seal 1 mainly stems from aging failure when there is less slag in the sealing environment, and / or wear failure when there is more slag in the sealing environment. To establish a correspondence between the deformation degree of the waist of the lip seal 1 and its failure state, this application first obtains the warning height of the lip seal 1 using existing empirical statistical methods and simulation analysis methods. When the natural height of the lip seal 1 is lower than the warning height, the lip seal 1 is in a critical failure state. Furthermore, the testing unit of this device employs aging and wear experiments to obtain the first lip seal 3 and the second lip seal 4 to be tested, which are respectively at the warning height after the two experiments. The device also obtains the warning data for the first lip seal 3 and the second lip seal 4. The comparison unit of this device compares the actual monitoring data of the lip seal 1 with the warning data of the first lip seal 3 and / or the second lip seal 4 in real time to determine whether the lip seal 1 has failed and replace it in a timely manner. Using this lip seal failure monitoring device to monitor the failure status of the lip seal 1 is beneficial for achieving real-time monitoring and for timely replacement of seals at risk of failure, thus avoiding the risk of oil leakage.

[0169] Since the principle behind this device for solving the problem is similar to that of the lip seal failure monitoring method, the implementation of this device can be found in the implementation of the lip seal failure monitoring method, and the repetitive parts will not be repeated.

[0170] It should be understood that in the various embodiments of this document, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0171] It should also be understood that, in the embodiments herein, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0172] Furthermore, the functional units in the various embodiments of this document can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0173] This document uses specific embodiments to illustrate the principles and implementation methods of this document. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this document. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this document. Therefore, the content of this specification should not be construed as a limitation of this document.

Claims

1. A method for monitoring the failure of a lip seal, characterized in that, include: Based on the warning height of the lip seal, the first lip seal to be tested after the aging test and the second lip seal to be tested after the wear test are obtained; By comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test, it is determined whether the lip seal has failed. The warning data for the first lip seal under test includes: radial data of the waist of the first lip seal under test under static sealing conditions; and tangential data of the waist of the first lip seal under test under dynamic sealing conditions. The warning data for the second lip seal under test includes: radial data of the waist of the second lip seal under static sealing conditions; and tangential data of the waist of the second lip seal under dynamic sealing conditions.

2. The method for monitoring the failure of lip seals according to claim 1, characterized in that, Comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed includes: The actual monitoring data of the lip seal includes the actual radial force and the actual tangential force at the waist. The waist tangential data and waist radial data of the first lip seal under test are the first waist tangential force and the first waist radial force, respectively; If the actual radial force at the waist is less than the first radial force at the waist; and / or, if the actual tangential force at the waist is less than the first tangential force at the waist, then the lip seal is determined to be faulty.

3. The method for monitoring the failure of lip seals according to claim 1, characterized in that, Comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed includes: The actual monitoring data of the lip seal includes the actual radial force and the actual tangential force at the waist. The waist tangential data and waist radial data of the second lip seal under test are the second waist tangential force and the second waist radial force, respectively; If the actual radial force at the waist is less than the second radial force at the waist; and / or, if the actual tangential force at the waist is less than the second tangential force at the waist, then the lip seal is determined to be faulty.

4. The method for monitoring the failure of a lip seal according to claim 1, characterized in that, Comparing the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed includes: Obtain the waist tangential data of the first lip seal under test and the weighted tangential data of the waist tangential data of the second lip seal under test; Obtain the waist radial data of the first lip seal under test and the weighted radial data of the waist radial data of the second lip seal under test; By comparing the actual monitoring data with the weighted tangential data and / or the weighted radial data, it is determined whether the lip seal has failed.

5. The method for monitoring the failure of a lip seal according to claim 4, characterized in that, The actual monitoring data of the lip seal includes the actual radial force and the actual tangential force at the waist. The weighted tangential data is the weighted tangential force, and the weighted radial data is the weighted radial force; If the actual radial force at the waist is less than the weighted radial force; and / or, if the actual tangential force at the waist is less than the weighted tangential force, then the lip seal is determined to be faulty.

6. The method for monitoring the failure of a lip seal according to claim 4, characterized in that, Obtaining the waist radial data of the first lip seal under test and the weighted radial data of the waist radial data of the second lip seal under test, including: Determine a first weighting ratio for the waist radial data of the first lip seal to be tested, and a second weighting ratio for the waist radial data of the second lip seal to be tested; Specifically, under the condition that the oil contains slag and stone, the first weight ratio is 0-0.3 and the second weight ratio is 0.3-1; under the condition that the oil does not contain slag and stone or the slag and stone content is less than 10%, the first weight ratio is 0-0.9 and the second weight ratio is 0.9-1; under the condition that the oil does not contain slag and stone or the slag and stone content is greater than 90%, the first weight ratio is 0-0.1 and the second weight ratio is 0.1-1.

7. The method for monitoring the failure of a lip seal according to claim 4, characterized in that, The weighted tangential data of the waist tangential data of the first lip seal under test and the waist tangential data of the second lip seal under test are obtained, including: The third weighting ratio of the waist tangential data of the first lip seal under test and the fourth weighting ratio of the waist tangential data of the second lip seal under test are determined. Specifically, in the case where the oil contains slag and stone, the third weighting ratio is 0-0.3 and the fourth weighting ratio is 0.3-1; in the case where the oil does not contain slag and stone or the slag and stone content is less than 10%, the third weighting ratio is 0-0.9 and the fourth weighting ratio is 0.9-1; and in the case where the oil does not contain slag and stone or the slag and stone content is greater than 90%, the third weighting ratio is 0-0.1 and the fourth weighting ratio is 0.1-1.

8. The method for monitoring the failure of a lip seal according to claim 1, characterized in that, Based on the warning height of the lip seal, the first lip seal to be tested after the aging test is obtained, including: The lip seal is compressed at an aging temperature of 60℃-150℃ and maintained for an aging time. Then, the external force on the lip seal is removed at room temperature and the seal is allowed to recover for 12 hours. The recovery height of the lip seal at the aging time is then obtained. Based on the aging temperature, the aging time, and the recovery height, extrapolate the warning temperature and warning time of the lip seal at the warning height; Based on the warning temperature and the warning time, an aging test is conducted on the lip-shaped seal to obtain the first lip-shaped seal to be tested.

9. The method for monitoring the failure of a lip seal according to claim 1, characterized in that, Based on the warning height of the lip seal, the second lip seal to be tested after the wear test is obtained, including: When the online speed is 0m / s-8m / s, the lip edge of the lip seal is tangentially worn until the height of the lip seal reaches the warning height, thus obtaining the second lip seal to be tested.

10. A lip seal failure monitoring device, characterized in that, include: The test unit, based on the warning height of the lip seal, obtains the first lip seal to be tested after the aging test and the second lip seal to be tested after the wear test; The comparison unit compares the actual monitoring data of the lip seal with the warning data of the first lip seal under test and / or the second lip seal under test to determine whether the lip seal has failed. The warning data for the first lip seal under test includes: radial data of the waist of the first lip seal under test under static sealing conditions; and tangential data of the waist of the first lip seal under test under dynamic sealing conditions. The warning data for the second lip seal under test includes: radial data of the waist of the second lip seal under static sealing conditions; and tangential data of the waist of the second lip seal under dynamic sealing conditions.

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