A bearing wear condition detection method and related equipment

Abstract

The present application provides a method and related equipment for detecting the wear condition of a bearing. By applying a voltage to the crankshaft end and then detecting an electrical signal on the bearing, it is determined whether the bearing is worn by detecting the electrical signal on the bearing shaft, thereby realizing the detection of the wear condition of the bearing shaft without installing an oil film thickness sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment detection, and in particular to a bearing wear condition detection method and related equipment for detecting the bearing wear condition. Background Art

[0002] The bearing is one of the key devices to ensure the normal operation of the engine. Due to equipment aging or other reasons, the bearing may wear out during the operation of the engine. In mild cases, it will cause the bearing surface to deform, knock or burn. In severe cases, it will cause the engine to seize and damage the engine.

[0003] In the existing technology, the bearing wear is mainly detected by the thermal-electric monitoring method. The thermal-electric monitoring method has been the research focus of diesel engine bearing wear monitoring in recent years. For example, the BeCOMS bearing wear online monitoring system developed by ESC in Germany is based on monitoring the low-frequency and high-frequency electromagnetic amplitudes generated by the friction of the engine metal surfaces containing different metals or alloys, such as the crankshaft and the bearing, or the piston ring and the cylinder liner. The system does not require any changes to the engine. It only uses a special adapter system to install a sensor, connect it to the signal conditioning box and the computer, and early fault detection can be achieved. Another important function of this monitoring system is to identify the wear range, even accurate to the affected bearing.

[0004] However, when monitoring the bearing wear through the thermal-electric monitoring method, it is necessary to install an oil film thickness sensor, which is difficult to install, easy to damage, and difficult to test. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a method for detecting the wear condition of a bearing and related equipment to detect the wear condition of a bearing shaft.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A method for detecting bearing wear conditions, comprising:

[0008] Outputting a discharge instruction to the power transmitter so that the power transmitter discharges toward the crankshaft end;

[0009] Detecting an electrical signal of a bearing bush corresponding to the crankshaft end;

[0010] The wear value of the bearing shell that matches the electrical signal is obtained.

[0011] Optionally, in the above-mentioned bearing wear condition detection method, the power transmitter is a constant current power transmitter, the electrical signal is a voltage signal, and obtaining the bearing wear value matching the electrical signal includes:

[0012] The corresponding resistance value is calculated based on Ohm's law, the output current of the power transmitter and the voltage signal;

[0013] The wear value of the bearing shell that matches the resistance value is obtained.

[0014] Optionally, in the above-mentioned bearing wear condition detection method, the power transmitter is a constant voltage power transmitter, the electrical signal is a current signal, and obtaining the bearing wear value matching the electrical signal includes:

[0015] Calculate the corresponding resistance value based on Ohm's law, the output voltage of the power transmitter and the current signal;

[0016] The wear value of the bearing shell that matches the resistance value is obtained.

[0017] Optionally, the above bearing wear condition detection method further includes: obtaining the crankshaft speed;

[0018] The obtaining of the wear value of the bearing bush matching the resistance value comprises:

[0019] A wear value corresponding to the crankshaft speed and the resistance value is obtained based on a preset mapping relationship.

[0020] Optionally, the above bearing wear condition detection method further includes:

[0021] Determine whether the wear value is greater than a preset value, and output a warning message when the wear value is greater than the preset value.

[0022] A bearing wear condition detection device, comprising:

[0023] A transmitter control unit, used for outputting a discharge instruction to the power transmitter, so that the power transmitter discharges to the crankshaft end;

[0024] a receiver control unit, for detecting an electrical signal of a bearing bush corresponding to the crankshaft end by controlling a power supply receiver;

[0025] The wear value calculation unit is used to obtain the wear value of the bearing shell that matches the electrical signal.

[0026] Optionally, in the above-mentioned bearing wear condition detection device, the power transmitter is a constant current power transmitter, the electrical signal is a voltage signal, and the wear value calculation unit, when acquiring the wear value of the bearing that matches the electrical signal, is specifically used to:

[0027] The corresponding resistance value is calculated based on Ohm's law, the output current of the power transmitter and the voltage signal;

[0028] The wear value of the bearing shell that matches the resistance value is obtained.

[0029] Optionally, in the above-mentioned bearing wear condition detection device, the power transmitter is a constant voltage power transmitter, the electrical signal is a current signal, and the wear value calculation unit, when acquiring the wear value of the bearing that matches the electrical signal, is specifically used to:

[0030] Calculate the corresponding resistance value based on Ohm's law, the output voltage of the power transmitter and the current signal;

[0031] The wear value of the bearing shell that matches the resistance value is obtained.

[0032] A bearing wear condition detection device, comprising:

[0033] The memory is used to store programs;

[0034] The processor is used to execute the program to implement each step of the bearing wear condition detection method as described in any one of the above items.

[0035] A bearing wear condition detection system comprises: the bearing wear condition detection device described above;

[0036] Also includes:

[0037] A power transmitter, used for discharging to the crankshaft end when a discharge instruction is obtained;

[0038] A power receiver is used to detect the current signal of the bearing corresponding to the crankshaft end.

[0039] Based on the above technical scheme, the above scheme provided by the embodiment of the present invention applies voltage to the crankshaft end and then detects the electrical signal on the bearing. By detecting the electrical signal on the bearing shaft, it is determined whether the bearing shaft is worn, thereby realizing the detection of bearing shaft wear without the need to install an oil film thickness sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 A schematic flow chart of a bearing wear condition detection method disclosed in an embodiment of the present application;

[0042] Figure 2A schematic flow chart of a bearing wear condition detection method disclosed in another embodiment of the present application;

[0043] Figure 3 A schematic flow chart of a bearing wear condition detection method disclosed in another embodiment of the present application;

[0044] Figure 4 It is a structural schematic diagram of a bearing wear condition detection device disclosed in an embodiment of the present application;

[0045] Figure 5 This is a schematic diagram of the structure of the bearing wear condition detection device disclosed in the embodiment of the present application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0047] The applicant has found through research that the bearing wear phenomenon does not appear suddenly when the engine is running, but gradually appears when the engine is running. This is a gradually changing phenomenon. Therefore, by monitoring the changes in the bearing, timely alarms can be given when excessive bearing wear occurs, ensuring that no abnormal conditions occur in the engine, and timely troubleshooting of the engine bearing wear can ensure the safe and reliable operation of the engine.

[0048] In the bearing wear condition detection scheme disclosed in the present application, the bearing wear degree is mainly monitored by measuring the resistance change between the crankshaft and the bearing. In view of the difficulty in directly measuring the bearing and the crankshaft, the bearing is connected to the engine body, and the crankshaft is connected to the phase, a resistance measuring device is now used to measure the resistance between the flywheel and the engine body, and the bearing wear degree is inferred by the change in resistance.

[0049] For details, see Figure 1 The bearing wear condition detection method disclosed in the embodiment of the present application includes steps S101-S103.

[0050] Step S101: outputting a discharge instruction to the power transmitter, so that the power transmitter discharges to the crankshaft end.

[0051] In this step, a discharge command can be output to the power transmitter at a specific time interval. When the power transmitter receives the discharge command, it discharges to the crankshaft end and adds current to the crankshaft end. Crankshaft: Bears the force from both sides and converts it into torque to be output through the crankshaft and drive other accessories on the engine to work.

[0052] The power transmitter may be a constant current power transmitter or a constant voltage power transmitter, and the specific type of power transmitter is determined by design requirements.

[0053] Step S102: Detecting the electrical signal of the bearing corresponding to the crankshaft end.

[0054] Bearing: The part where the sliding bearing contacts the journal. It is a semi-cylindrical surface in the shape of a tile and is very smooth. It is generally made of wear-resistant materials such as bronze and anti-friction alloy. In special cases, it can be made of wood, engineering plastics or rubber.

[0055] When the engine is running normally, the oil in the oil pan will form an oil film between the crankshaft and the bearing. If the crankshaft and bearing are normal, the current carried by the crankshaft cannot be conducted to the bearing. At this time, the power receiver cannot receive the electrical signal, which proves that the engine bearing is not worn. When the oil film between the engine crankshaft and the bearing is not enough to cover the entire gap between the crankshaft and the bearing, there will be a small contact area between the crankshaft and the bearing, and the current will flow between the two. At this time, the power receiver can detect the electrical signal.

[0056] Step S103: Acquire the wear value of the bearing shell that matches the electrical signal.

[0057] When the crankshaft is operating normally and there is no wear on the bearing, the resistance between the crankshaft and the bearing is infinite. When the crankshaft rotates and the bearing is slightly worn, the oil film between the crankshaft and the bearing will decrease, and the power receiver will detect current conduction. At this time, since there is less contact area between the two, according to R=ρL / S (L: contact length, S: contact area), the resistance value is larger. As the wear becomes more and more serious, the contact area will gradually increase, causing the calculated resistance value to decrease.

[0058] From the above principle analysis, it can be seen that when the bearing is worn, the power receiver will detect the electrical signal, and then calculate the size of the equivalent resistance between the crankshaft and the bearing according to the size of the point signal. The greater the resistance between the crankshaft and the bearing, the smaller the gap in the oil film between the crankshaft and the bearing, and the bearing wear is very small at this time; the smaller the resistance between the crankshaft and the bearing, the gradually reduced oil film between the crankshaft and the bearing, and the more serious the bearing wear. In this solution, there is no need to install an oil film thickness sensor to accurately detect the bearing wear.

[0059] In the technical solution disclosed in the embodiment of the present application, the power transmitter may be a constant current power transmitter, that is, the output current of the power transmitter is constant, see Figure 2At this time, the electrical signal received by the power supply receiver is a voltage signal, and obtaining the wear value of the bearing bush matching the current signal includes:

[0060] The corresponding resistance value R is calculated based on Ohm's law R=U / I, the output current (I) of the power transmitter and the voltage signal (U) detected by the receiver;

[0061] When the power transmitter is a constant current power transmitter, the current between the power receiver and the power transmitter is fixed, and the voltage can be monitored. Therefore, the resistance value R can be calculated according to R=U / I. The wear of the engine bearing can be judged based on the measurement results, and protective measures can be taken in time to ensure the safe, continuous and effective operation of the engine.

[0062] In another embodiment of the present application, the power transmitter is a constant voltage power transmitter, see Figure 3 At this time, the electrical signal received by the power supply receiver is a current signal, and obtaining the wear value of the bearing bush matching the electrical signal includes:

[0063] Calculate the corresponding resistance value based on Ohm's law, the output voltage of the power transmitter and the current signal;

[0064] The wear value of the bearing shell that matches the resistance value is obtained.

[0065] When the power transmitter is a constant voltage power transmitter, the voltage between the power receiver and the power transmitter is fixed, and the current can be monitored. Therefore, the resistance value R can be calculated according to R=U / I. The wear of the engine bearing can be judged based on the measurement results, and protective measures can be taken in time to ensure the safe, continuous and effective operation of the engine.

[0066] In the technical solution disclosed in another embodiment of the present application, considering that the power transmitter uses a power transmitter that contacts the crankshaft end, since the crankshaft is constantly rotating when the engine is running, if a conventional power transmitter is used, the power transmitter end of the power transmitter is constantly in contact with the crankshaft, which will cause wear of the power transmitter end of the power transmitter. Therefore, in the present solution, the power transmitter end of the power transmitter adopts a brush structure to prevent damage to the power transmitter end.

[0067] In the technical solution disclosed in another embodiment of the present application, it is considered that after the current is conducted to the crankshaft at the power transmitting end, the crankshaft itself will be charged, and the speed of the crankshaft will also affect the size of the detected resistance value, that is, the voltage output size of the power transmitter and the crankshaft speed can cause the size of the crankshaft charging state to change. In view of this, in this solution, the real-time crankshaft speed can also be obtained. At this time, the wear value of the bearing that matches the resistance value is obtained, specifically including: based on a preset mapping relationship, obtaining the wear value corresponding to the crankshaft speed and the resistance value. In the technical solution disclosed in the present application, a mapping relationship between the resistance value and the crankshaft speed and the wear value can be pre-selected and established, and the relationship can be stored in a preset MAP map. After obtaining the resistance value and the crankshaft speed,

[0068] In the technical solution disclosed in another embodiment of the present application, in order to ensure the normal operation of the engine and prevent the engine from seizing, the technical solution disclosed in the embodiment of the present application may also include: judging whether the wear value is greater than a preset value, and outputting a warning message number when the wear value is greater than the preset value.

[0069] Corresponding to the above method, this embodiment discloses a bearing wear condition detection device. For the specific working contents of each unit in the device, please refer to the contents of the above method embodiment.

[0070] The bearing wear condition detection device provided in an embodiment of the present invention is described below. The bearing wear condition detection device described below and the bearing wear condition detection method described above can be referenced to each other.

[0071] See also Figure 4 The bearing wear condition detection device disclosed in the embodiment of the present application may include: a transmitter control unit A, a receiver control unit B, a wear value calculation unit C,

[0072] The transmitter control unit A corresponds to step S101 in the above method, and is used to output a discharge instruction to the power transmitter, so that the power transmitter discharges to the crankshaft end;

[0073] The receiver control unit B corresponds to step S102 in the above method, and is used to detect the electrical signal of the bearing bush corresponding to the crankshaft end by controlling the power supply receiver;

[0074] The wear value calculation unit C corresponds to step S103 in the above method, and is used to obtain the wear value of the bearing shell that matches the electrical signal.

[0075] Corresponding to the above method, when the power transmitter is a constant current power transmitter, the electrical signal is a voltage signal, and the wear value calculation unit C, when acquiring the wear value of the bearing bush matching the electrical signal, is specifically used for:

[0076] The corresponding resistance value is calculated based on Ohm's law, the output current of the power transmitter and the voltage signal;

[0077] The wear value of the bearing shell that matches the resistance value is obtained.

[0078] Corresponding to the above method, when the power transmitter is a constant voltage power transmitter, the electrical signal is a current signal, and the wear value calculation unit C, when acquiring the wear value of the bearing bush matching the electrical signal, is specifically used to:

[0079] Calculate the corresponding resistance value based on Ohm's law, the output voltage of the power transmitter and the current signal;

[0080] The wear value of the bearing shell that matches the resistance value is obtained.

[0081] Corresponding to the above method, in the above device, the wear value calculation unit is also used to obtain the crankshaft speed; when obtaining the wear value of the bearing shell matching the resistance value, the wear value calculation unit is specifically used to: obtain the wear value corresponding to the crankshaft speed and the resistance value based on a preset mapping relationship.

[0082] Corresponding to the above method, the above device also includes an alarm information output unit for determining whether the wear value is greater than a preset value, and outputting a warning information signal when the wear value is greater than the preset value.

[0083] See also Figure 5 In view of the above method, the present application also discloses a bearing wear condition detection device, see Figure 5 As shown, it may include: at least one processor 100, at least one communication interface 200, at least one memory 300 and at least one communication bus 400;

[0084] In the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300, and the communication bus 400 is at least one, and the processor 100, the communication interface 200, and the memory 300 communicate with each other through the communication bus 400; obviously, Figure 5 The communication connections shown for the processor 100, the communication interface 200, the memory 300, and the communication bus 400 are merely optional;

[0085] Optionally, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;

[0086] The processor 100 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0087] The memory 300 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0088] The processor 100 is specifically configured to:

[0089] Outputting a discharge instruction to the power transmitter so that the power transmitter discharges toward the crankshaft end;

[0090] Detecting an electrical signal of a bearing bush corresponding to the crankshaft end;

[0091] The wear value of the bearing shell that matches the electrical signal is obtained.

[0092] The processor is also used to execute various steps of other methods disclosed in the above method embodiments, which will not be described in detail again.

[0093] Corresponding to the above-mentioned device, the present application also discloses a bearing wear condition detection system using the above-mentioned bearing wear condition detection device, and the system may include the bearing wear condition detection device described in the above-mentioned embodiment;

[0094] Also includes:

[0095] A power transmitter, used for discharging to the crankshaft end when a discharge instruction is obtained;

[0096] A power receiver is used to detect the current signal of the bearing corresponding to the crankshaft end.

[0097] For the convenience of description, the above system is described by dividing the functions into various modules. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0098] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0099] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0100] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0101] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0102] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for detecting bearing wear, characterized in that: include: Outputting a discharge instruction to the power transmitter so that the power transmitter discharges toward the crankshaft end; Detecting an electrical signal of a bearing bush corresponding to the crankshaft end; Acquiring a wear value of the bearing bushing that matches the electrical signal; Wherein, the power transmitter is a constant current power transmitter, the electrical signal is a voltage signal, and obtaining the wear value of the bearing bush matching the electrical signal includes: The corresponding resistance value is calculated based on Ohm's law, the output current of the power transmitter and the voltage signal; Get the crankshaft speed; Acquire a wear value corresponding to the crankshaft speed and the resistance value based on a preset mapping relationship; or, The power transmitter is a constant voltage power transmitter, the electrical signal is a current signal, and obtaining the wear value of the bearing bush matching the electrical signal includes: The corresponding resistance value is calculated based on Ohm's law, the output voltage of the power transmitter and the current signal; Get the crankshaft speed; Acquire a wear value corresponding to the crankshaft speed and the resistance value based on a preset mapping relationship; The mapping relationship between the resistance value, the crankshaft speed and the wear value is established in advance.

2. The method for detecting bearing wear according to claim 1, characterized in that: Also includes: Determine whether the wear value is greater than a preset value, and output a warning message when the wear value is greater than the preset value.

3. A bearing wear condition detection device, characterized in that: include: A transmitter control unit, used for outputting a discharge instruction to the power transmitter, so that the power transmitter discharges to the crankshaft end; a receiver control unit, for detecting an electrical signal of a bearing bush corresponding to the crankshaft end by controlling a power supply receiver; a wear value calculation unit, used for obtaining a wear value of the bearing bush matching the electrical signal; Wherein, the power transmitter is a constant current power transmitter, the electrical signal is a voltage signal, and the wear value calculation unit, when acquiring the wear value of the bearing bush matching the electrical signal, is specifically used for: Calculate the corresponding resistance value based on Ohm's law, the output current of the power transmitter and the voltage signal; Get the crankshaft speed; Acquire a wear value corresponding to the crankshaft speed and the resistance value based on a preset mapping relationship; or, The power transmitter is a constant voltage power transmitter, the electrical signal is a current signal, and the wear value calculation unit, when acquiring the wear value of the bearing bush matching the electrical signal, is specifically used for: The corresponding resistance value is calculated based on Ohm's law, the output voltage of the power transmitter and the current signal; Get the crankshaft speed; The wear value corresponding to the crankshaft speed and the resistance value is obtained based on a preset mapping relationship; wherein a mapping relationship between the resistance value and the crankshaft speed and the wear value is established in advance.

4. A bearing wear condition detection device, characterized in that: include: Memory, used to store programs; The processor is used to execute the program to implement the various steps of the bearing wear condition detection method as described in any one of claims 1-2.

5. A bearing wear condition detection system, characterized in that: include: The bearing wear condition detection device according to claim 4; Also includes: A power transmitter, used for discharging to the crankshaft end when a discharge instruction is obtained; A power receiver is used to detect the current signal of the bearing corresponding to the crankshaft end.

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