CN113671282A - Method and device for determining health condition of mechanical equipment and engineering machinery - Google Patents
Method and device for determining health condition of mechanical equipment and engineering machinery Download PDFInfo
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- CN113671282A CN113671282A CN202110767513.5A CN202110767513A CN113671282A CN 113671282 A CN113671282 A CN 113671282A CN 202110767513 A CN202110767513 A CN 202110767513A CN 113671282 A CN113671282 A CN 113671282A
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Abstract
The invention relates to the technical field of engineering machinery, and discloses a judgment method and a judgment device for judging the health condition of mechanical equipment and the engineering machinery, wherein the judgment method comprises the following steps: monitoring whether induced electromotive force is generated in an induced electromotive force generation module, wherein all or part of the induced electromotive force generation module is positioned in a magnetic field generated by a magnetic field generation module, and the induced electromotive force is generated by adsorbing abrasive dust in oil flowing through the magnetic field in the mechanical equipment through the magnetic field based on the magnetic field generation module; judging whether the oil liquid contains the abrasive dust or not according to a monitoring result; and judging the wear state of a part generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the quantity of the abrasive dust under the condition that the abrasive dust exists in the oil liquid. Therefore, the health condition of the mechanical equipment is judged.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a judging method and a judging device for judging the health condition of mechanical equipment and the engineering machinery.
Background
The boom rotating mechanism is a hydraulic direct-drive mechanism, and the translation of a piston in the mechanism is converted into the axial rotation of the boom through hydraulic drive. The arm support rotating mechanism runs under complex working conditions such as large load for a long time, the gears are continuously meshed to cause surface abrasion, and particularly impact vibration is generated when the rotating mechanism is repeatedly started and stopped, so that the abrasion among the gears is aggravated. Long-term abrasion causes the fit clearance of gears in the mechanism to be enlarged, so that the gears cannot move stably, and finally the structure is scrapped. How to detect the wear condition of the gear teeth in the use of the rotating mechanism, especially the wear condition in the vibration process, is the key for ensuring the safe operation of the mechanism. Two techniques for detecting wear are disclosed in the prior art. One of the detection devices is a lubricating oil scrap iron detection device, as shown in fig. 1, when lubricating oil passes through a shell 3-5 of the device, scrap iron is adsorbed by a detection head and conducts magnetic steel 3-1 and ferromagnetic metal sheets 3-2, current flows through the conducted circuit, and a current measurement module measures total current flowing through each metal sheet in real time, so that the number of the conducted metal sheets in the ferromagnetic metal sheet group can be calculated according to the total current measured by the current measurement module, and further the content of the iron scrap in the lubricating oil is measured. The other is a metal abrasive dust cleaning device of the engine, a power supply is arranged in an electric control main body 4-4 of the device, and an electromagnet is arranged at the tail end of a probe 4-7 and is connected with the power supply and can adsorb abrasive dust; the device can also detect metal abrasive dust through the detection ends 4-8. Although the conventional lubricating oil abrasive dust monitoring device can monitor or clean abrasive dust in lubricating oil, the conventional lubricating oil abrasive dust monitoring device does not have the function of judging the health condition of mechanical equipment. The detection mode through abrasive dust intercommunication circuit also can lead to the unable intercommunication of circuit because of the less unable intercommunication circuit of abrasive dust size, or because of iron fillings placement is not between magnet steel and sheetmetal in the adsorption process, and then the condition of lou examining appears.
Disclosure of Invention
The object of the present invention is to provide a determination method and a determination apparatus for determining the health of a machine equipment, and a construction machine, which can solve the above problems, or at least partially solve them.
In order to achieve the above object, one aspect of the present invention provides a determination method for determining a health condition of a mechanical apparatus, the determination method including: monitoring whether induced electromotive force is generated in an induced electromotive force generation module, wherein all or part of the induced electromotive force generation module is positioned in a magnetic field generated by a magnetic field generation module, and the induced electromotive force is generated by adsorbing abrasive dust in oil flowing through the magnetic field in the mechanical equipment through the magnetic field based on the magnetic field generation module; judging whether the oil liquid contains the abrasive dust or not according to a monitoring result; and judging the wear state of a part generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the quantity of the abrasive dust under the condition that the abrasive dust exists in the oil liquid.
Optionally, the determining the wear state of the component of the mechanical equipment generating the abrasive dust and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the amount of the abrasive dust includes at least one of: under the condition that the induced electromotive force is within a first preset electromotive force range, judging that the part is not abraded or slightly abraded and/or judging that the mechanical equipment is in a normal working state; under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time does not reach a first preset numerical value, judging that the part is in normal wear and/or judging that the mechanical equipment is in a normal working state; under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in the preset time reaches a first preset value, judging that the part is in fatigue wear and/or judging that the mechanical equipment is in a normal working state; and under the condition that the induced electromotive force is in a third preset electromotive force range, judging that the part is severely worn or severely abraded and/or judging that the mechanical equipment is in an abnormal operation state and has a service life ending, wherein the maximum value of the first preset electromotive force range is smaller than or equal to the minimum value of the second preset electromotive force range, and the maximum value of the second preset electromotive force range is smaller than or equal to the minimum value of the third preset electromotive force range.
Optionally, in the case where the component is fatigue-worn, the determination method further includes: under the condition that the quantity in the preset time does not reach a second preset value, judging that the mechanical equipment can be continuously used, wherein the second preset value is larger than the first preset value; and/or determining the end of life of the component and the mechanical equipment in case the number within the predetermined time reaches the second preset value.
Alternatively, the amount of the abrasive dusts is determined based on the number of times the induced electromotive force is generated.
Accordingly, another aspect of the present invention also provides a determination apparatus for determining a health condition of a mechanical device, the determination apparatus including: the induced electromotive force monitoring module is used for monitoring whether induced electromotive force is generated in the induced electromotive force generating module, all or part of the induced electromotive force generating module is positioned in a magnetic field generated by the magnetic field generating module, and the induced electromotive force is generated by adsorbing the abrasive dust in oil flowing through the magnetic field in the mechanical equipment through the magnetic field based on the magnetic field generating module; the abrasive dust judging module is used for judging whether the abrasive dust exists in the oil liquid or not according to a monitoring result; and the health judging module is used for judging the wear state of a part generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the quantity of the abrasive dust under the condition that the abrasive dust exists in the oil liquid.
Optionally, the health determination module determines the wear state of the component of the mechanical equipment generating the abrasive dust and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the amount of the abrasive dust includes at least one of: under the condition that the induced electromotive force is within a first preset electromotive force range, judging that the part is not abraded or slightly abraded and/or judging that the mechanical equipment is in a normal working state; under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time does not reach a first preset numerical value, judging that the part is in normal wear and/or judging that the mechanical equipment is in a normal working state; under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in the preset time reaches a first preset value, judging that the part is in fatigue wear and/or judging that the mechanical equipment is in a normal working state; and under the condition that the induced electromotive force is in a third preset electromotive force range, judging that the part is severely worn or severely abraded and/or judging that the mechanical equipment is in an abnormal operation state and has a service life ending, wherein the maximum value of the first preset electromotive force range is smaller than or equal to the minimum value of the second preset electromotive force range, and the maximum value of the second preset electromotive force range is smaller than or equal to the minimum value of the third preset electromotive force range.
Optionally, in the case that the component is fatigue worn, the health determination module is further configured to: under the condition that the quantity in the preset time does not reach a second preset value, judging that the mechanical equipment can be continuously used, wherein the second preset value is larger than the first preset value; and/or determining the end of life of the component and the mechanical equipment in case the number within the predetermined time reaches the second preset value.
Alternatively, the amount of the abrasive dusts is determined based on the number of times the induced electromotive force is generated.
In addition, another aspect of the present invention provides a construction machine including the above determination device.
Through the technical scheme, whether the oil liquid contains the abrasive dust or not is detected by utilizing whether the induced electromotive force is generated or not, and under the condition that the abrasive dust is generated in the oil liquid, the abrasion state of a part generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment are/is judged according to the generated induced electromotive force and/or the quantity of the abrasive dust, so that the health condition of the mechanical equipment is judged. In addition, whether the oil liquid has abrasive dust or not is detected by using whether induced electromotive force is generated or not, the magnetic field generating module adsorbs the abrasive dust in the oil liquid flowing through the magnetic field generated by the magnetic field generating module, and after the abrasive dust is adsorbed, the magnetic field generated by the magnetic field generating module changes to further cause the magnetic flux in the induced electromotive force generating module to change so as to cause the induced electromotive force to be generated in the induced electromotive force generating module; so, adsorb through the abrasive dust to in the fluid and detect whether have the abrasive dust in the fluid, need not the intercommunication circuit, just can adsorb as long as there is the abrasive dust in the fluid, can avoid because of the less or abrasive dust falling point of abrasive dust size is not between the tie point and the unable circumstances of intercommunication circuit, reduce the probability that the hourglass detected appears, improve the reliability.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a lubricant iron scrap detection device;
FIG. 2 is a schematic view of an engine metal swarf cleaning apparatus;
FIG. 3 is a flow chart of a determination method for determining a health of a piece of machinery provided by an embodiment of the present invention;
FIG. 4 is a block diagram of a determination apparatus for determining a health condition of a machine according to another embodiment of the present invention;
fig. 5 is a partial structural schematic view of a detection device for detecting abrasive dust in oil according to another embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a device for detecting abrasive dust in oil according to another embodiment of the present invention;
fig. 7 is a schematic view illustrating an installation of a detection device on a boom rotation mechanism according to another embodiment of the present invention; and
fig. 8 is a schematic view illustrating an installation of a detection device on a boom rotation mechanism according to another embodiment of the present invention.
Description of the reference numerals
1 arm support rotating mechanism 2 detection device
2-1 connector 2-2 insulating shell
2-3 iron core 2-1-1 electromagnetic exciting coil wire socket
2-1-2 electromagnetic induction coil wire socket
2-2-1 electromagnetic exciting coil plug
2-2-2 electromagnetic induction coil plug
2-2-3 electromagnetic exciting coil 2-2-4 electromagnetic induction coil
2-4 resistance R12-5 signal processing device
2-6 power supply U1
3 module is judged to 4 abrasive dusts of induced electromotive force monitoring module
3-1 magnetic steel 3-2 ferromagnetic metal sheet group
3-3 insulating layer 3-4 insulating sleeve
3-5 casing 4-1 handle
4-2 switch 4-3 current regulating device
4-4 electric control main body 4-5 ammeter
4-6 casing 24-7 probe
4-8 detection end 4-9 detector ammeter
5 health judging module
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
An aspect of an embodiment of the present invention provides a determination method for detecting abrasive dust in oil.
FIG. 3 is a flow chart of a determination method for determining a health of a machine in accordance with an embodiment of the present invention. As shown in fig. 3, the determination method includes the following.
In step S30, it is monitored whether or not an induced electromotive force is generated in the induced electromotive force generation module, and the induced electromotive force generation module is entirely or partially in a magnetic field generated by the magnetic field generation module, and the induced electromotive force is generated by the magnetic field generation module adsorbing, by the magnetic field, the abrasive dust present in the oil flowing through the magnetic field in the mechanical device. The oil liquid flows in a cavity of the mechanical equipment. Alternatively, the mechanical equipment is not limited in the embodiment of the present invention, and any equipment that uses oil and in which abrasive dust is present may determine the health condition using the determination method provided in the embodiment of the present invention. For example, the mechanical device may be a boom rotation mechanism. Alternatively, in the embodiment of the present invention, the induced electromotive force generating module may be an electromagnetic induction coil. Alternatively, in the embodiment of the present invention, the magnetic field generating module may generate the magnetic field under the action of other magnetic fields. For example, the magnetic field generating module may be a core. In addition, other magnetic fields acting on the magnetic field generation module to generate the magnetic field may be generated by energization. For example, the other magnetic field acting on the magnetic field generating module to generate the magnetic field may be generated by an alternating current. Alternatively, an electromagnetic excitation coil is used to generate the other magnetic field, which is generated by the electromagnetic excitation coil under the action of an alternating current. Specifically, the electromagnetic excitation coil is connected with an alternating current power supply module to form a closed loop, and other magnetic fields are generated under the action of alternating current. In addition, other magnetic fields that act on the magnetic field generating module to generate a magnetic field may also be generated under the action of direct current.
In step S31, it is determined whether or not there is any abrasive dust in the oil liquid based on the monitoring result. Under the condition that the induced electromotive force generated in the induced electromotive force generation module is monitored, the fact that abrasive dust is adsorbed is indicated, and the fact that the abrasive dust exists in the oil is judged; when the condition that the induced electromotive force generated in the induced electromotive force generation module is not monitored indicates that no abrasive dust is adsorbed, it is determined that no abrasive dust exists in the oil.
In step S32, in the case where the oil contains the abrasive dusts, the wear state of the components of the machine that generate the abrasive dusts and/or the operating state of the machine are determined based on the induced electromotive force generated and/or the amount of the abrasive dusts.
Through the technical scheme, whether the oil liquid contains the abrasive dust or not is detected by utilizing whether the induced electromotive force is generated or not, and under the condition that the abrasive dust is generated in the oil liquid, the abrasion state of a part generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment are/is judged according to the generated induced electromotive force and/or the quantity of the abrasive dust, so that the health condition of the mechanical equipment is judged. In addition, whether the oil liquid has abrasive dust or not is detected by utilizing whether the induced electromotive force is generated or not, the magnetic field generating module adsorbs the abrasive dust existing in the oil liquid flowing through the magnetic field generated by the magnetic field generating module, the magnetic field generated by the magnetic field generating module changes after the abrasive dust is adsorbed, and then the magnetic flux in the induced electromotive force generating module changes, so that the induced electromotive force is generated in the induced electromotive force generating module, therefore, whether the abrasive dust exists in the oil liquid or not is detected by adsorbing the abrasive dust in the oil liquid, a circuit is not required to be connected, the adsorption can be carried out as long as the abrasive dust exists in the oil liquid, the situation that the circuit cannot be connected due to the fact that the size of the abrasive dust is small or the abrasive dust falling point is not between circuit connection points can be avoided, the probability of missing detection is reduced, and the reliability is improved.
Optionally, in the embodiment of the present invention, the determining the wear state of the component generating the abrasive dust in the mechanical apparatus and/or the operating state of the mechanical apparatus according to the generated induced electromotive force and/or the amount of the abrasive dust includes at least one of: under the condition that the induced electromotive force is within a first preset electromotive force range, judging that the part is in a non-abrasion or light abrasion state and/or judging that the mechanical equipment is in a normal working state; under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time does not reach a first preset value, judging that the part is in normal wear and/or judging that the mechanical equipment is in a normal working state; under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time reaches a first preset value, judging that the part is in fatigue wear and/or judging that the mechanical equipment is in a normal working state; and under the condition that the induced electromotive force is in a third preset electromotive force range, judging that the component is severely worn or severely cut and worn and/or judging that the mechanical equipment is in an abnormal operation state and has the end of service life, wherein the maximum value of the first preset electromotive force range is smaller than or equal to the minimum value of the second preset electromotive force range, and the maximum value of the second preset electromotive force range is smaller than or equal to the minimum value of the third preset electromotive force range. In addition, in the embodiment of the present invention, the first preset emf range may be reduced to a specific value, for example, 0.
Optionally, in an embodiment of the present invention, in a case where the component is fatigue wear, the determination method further includes: under the condition that the quantity in the preset time does not reach a second preset value, judging that the mechanical equipment can be continuously used, wherein the second preset value is larger than the first preset value; and/or determining the end of life of the component and the mechanical equipment under the condition that the quantity in the preset time reaches a second preset value. In addition, in the embodiment of the present invention, the second preset value has a value range corresponding thereto.
Alternatively, in the embodiment of the present invention, the amount of the abrasive dusts is determined based on the number of times the induced electromotive force is generated. Specifically, the number of the grinding chips is accumulated once by generating the induced electromotive force once, and the number of times of the generated induced electromotive force is accumulated several times, wherein the number of times of the generated induced electromotive force is the number of the grinding chips.
Accordingly, another aspect of embodiments of the present invention provides a determination apparatus for determining a health condition of a machine.
Fig. 4 is a block diagram of a determination apparatus for determining a health condition of a machine according to another embodiment of the present invention. As shown in fig. 4, the detection device includes an induced electromotive force monitoring module 3, a wear debris determination module 4, and a health determination module 5. The induced electromotive force monitoring module 3 is used for monitoring whether the induced electromotive force generating module generates induced electromotive force, all or part of the induced electromotive force generating module is positioned in a magnetic field generated by the magnetic field generating module, and the induced electromotive force is generated by adsorbing abrasive dust in oil flowing through the magnetic field in the mechanical equipment through the magnetic field based on the magnetic field generating module; the abrasive dust judging module 4 is used for judging whether abrasive dust exists in the oil liquid according to the monitoring result; the health judging module 5 is used for judging the wear state of the part generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the quantity of the abrasive dust under the condition that the abrasive dust exists in the oil liquid.
Optionally, in an embodiment of the present invention, the health determination module determines the wear state of the component generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the amount of the abrasive dust includes at least one of: under the condition that the induced electromotive force is within a first preset electromotive force range, judging that the part is in a non-abrasion or light abrasion state and/or judging that the mechanical equipment is in a normal working state; under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time does not reach a first preset value, judging that the part is in normal wear and/or judging that the mechanical equipment is in a normal working state; judging that the part is in fatigue wear and/or judging that the mechanical equipment is in a normal working state under the conditions that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time reaches a first preset value; and under the condition that the induced electromotive force is in a third preset electromotive force range, judging that the component is severely worn or severely cut and worn and/or judging that the mechanical equipment is in an abnormal operation state and has the end of service life, wherein the maximum value of the first preset electromotive force range is smaller than or equal to the minimum value of the second preset electromotive force range, and the maximum value of the second preset electromotive force range is smaller than or equal to the minimum value of the third preset electromotive force range.
Optionally, in an embodiment of the present invention, in a case where the component is fatigue wear, the health determination module is further configured to: under the condition that the quantity in the preset time does not reach a second preset value, judging that the mechanical equipment can be continuously used, wherein the second preset value is larger than the first preset value; and/or determining the end of life of the component and the mechanical equipment under the condition that the quantity in the preset time reaches a second preset value.
Alternatively, in the embodiment of the present invention, the amount of the abrasive dusts is determined based on the number of times the induced electromotive force is generated.
The specific operating principle and the benefits of the determination device for determining the health condition of the mechanical equipment provided by the embodiment of the invention are similar to those of the determination method for determining the health condition of the mechanical equipment provided by the embodiment of the invention, and the explanations of the specification for the determination device and the specification for the determination method can be mutually cited.
In the embodiment of the invention, the judging method can be divided into a part for detecting the abrasive dust in the oil liquid and a part for judging the health condition of the mechanical equipment, and the judging device can be divided into a detecting device for detecting the abrasive dust in the oil liquid and a module for judging the health condition of the mechanical equipment. The detection device comprises the induced electromotive force monitoring module and a grinding scrap judging module; the module for determining the health condition of the mechanical device corresponds to the health determination module described above.
Fig. 5 is a schematic view of a partial structure of a device for detecting abrasive dust in oil according to another embodiment of the present invention, and fig. 6 is a schematic view of a circuit connection diagram of the device for detecting abrasive dust in oil according to another embodiment of the present invention. In the embodiment of the present invention, the number of the detection devices may be adjusted according to actual situations. As shown in fig. 6, three detection devices are connected in parallel. The following describes an exemplary portion for detecting the wear debris in the oil in the determination method for determining the health of the mechanical equipment according to the embodiment of the present invention with reference to fig. 5 and 6. In this embodiment, the induced electromotive force generation module is an electromagnetic induction coil, and the magnetic field generation module is an iron core, so that the iron core generates a magnetic field, the electromagnetic excitation coil generates a magnetic field after the electromagnetic excitation coil is supplied with alternating current, and the iron core is affected by the magnetic field generated by the electromagnetic excitation coil. In addition, in this embodiment, connection terminals are connected between the connection of the electromagnetic excitation coil and the alternating current and between the electromagnetic induction coil and the device for monitoring whether the induced electromotive force is generated to facilitate the line connection and disconnection. Further, in this embodiment, an insulating case is also used, and the electromagnetic induction coil, the iron core, and the electromagnetic excitation coil are placed in the insulating case to increase safety. In addition, in the embodiment of the present invention, the principle of detecting the abrasive dust is as follows: firstly, alternating voltage is applied to an electromagnetic excitation coil, the electromagnetic excitation coil generates a magnetic field, the magnetic field generated by the electromagnetic excitation coil magnetizes an iron core positioned in the electromagnetic excitation coil, the iron core generates a magnetic field, and an electromagnetic induction coil is positioned in the magnetic field generated by the iron core; when the magnetic field generated by the iron core changes, the electromagnetic induction coil can generate induction voltage; when the parts of mechanical equipment are normally/abnormally abraded, a large amount of/large-particle abrasive dust is generated in oil; when the magnetic field that the iron core produced is flowed through to the abrasive dust, the iron core adsorbs to the abrasive dust and makes the magnetic field that the iron core produced change, and then makes the magnetic flux in the electromagnetic induction coil change, and then produces induced voltage in the electromagnetic induction coil, produces induced electromotive force in the electromagnetic induction coil promptly.
As shown in FIG. 5, the detection device mainly comprises a connector 2-1, an insulating housing 2-2, an iron core 2-3, an electromagnetic excitation coil 2-2-3, an electromagnetic induction coil 2-2-4, a signal processing device 2-5, a power supply U12-6 and a resistor R12-4. Wherein, the power supply U12-6 is an alternating current power supply. In addition, two electromagnetic excitation coil wire sockets 2-1-1 and two electromagnetic induction coil wire sockets 2-1-2 are arranged on the connector 2-1; the insulating shell 2-2 is provided with two electromagnetic excitation coil plugs 2-2-1 and two electromagnetic induction coil plugs 2-2-2. The insulating shell 2-2 is screwed into the outer wall of the lubricating oil cavity of the mechanical equipment through threaded connection. The electromagnetic excitation coil 2-2-3 is arranged in the insulating shell 2-2, is connected with an electromagnetic excitation coil wire socket 2-1-1 on the connector 2-1 through an electromagnetic excitation coil plug 2-2-1, and forms a closed loop with a resistor R12-4 and a power supply U12-6 through the electromagnetic excitation coil wire socket 2-1-1. The iron core 2-3 (for example, a trapezoidal iron core) is of a hollow pipeline structure, the upper part of the iron core is of an external thread structure, the iron core is fixedly connected with the insulating shell 2-2 through threads, and two electromagnetic induction coil wire sockets 2-1-2, two electromagnetic induction coil plugs 2-2-2 and a signal processing device 2-5 which are arranged on the connector 2-1 form a closed loop. In addition, the electromagnetic excitation coil 2-2-3 and the electromagnetic induction coil 2-2-4 may be wound around the core 2-3. As shown in FIG. 6, when the detection device is operated, power is supplied by a power supply U12-6, and current forms a closed loop through a resistor R12-4 of a circuit in which the electromagnetic excitation coil is located and the electromagnetic excitation coil 2-2-3. The electromagnetic exciting coil 2-2-3 generates a magnetic field, and the magnetic field generated by the electromagnetic exciting coil 2-2-3 magnetizes the iron core 2-3 so that the iron core 2-3 generates a magnetic field. The magnetic field generated by the iron core 2-3 adsorbs abrasive dust existing in oil flowing through the iron core, wherein the capacity of the iron core 2-3 for adsorbing the abrasive dust can be realized by controlling the size of the resistor R12-4. As shown in fig. 5, the electromagnetic induction coil 2-2-4 is embedded in the insulating housing 2-2, and is connected to the electromagnetic induction coil wire socket 2-1-2 on the connector 2-1 through the electromagnetic induction coil plug 2-2, and is connected to the signal processing device 2-5 through the electromagnetic induction coil wire socket 2-1-2, so as to form a closed loop, wherein the signal processing device 2-5 is a module for monitoring whether induced electromotive force is generated in the embodiment of the present invention. When the oil liquid passes through the grinding dust, the electromagnetic induction coil generates induced electromotive force, the signal processing device 2-5 detects the induced electromotive force and displays the value as U2, and the size of U2 can indirectly reflect the size of the grinding dust. For example, the size of the abrasive dust may be determined from U2 based on table 1. Among them, in the relationship shown in table 1, it is considered that the minimum size of the abrasive dusts detectable by the detecting means is 45um, and the abrasive dusts below this size will not generate induced electromotive force. It should be noted that the size of the abrasive dust that can be detected is not limited in the embodiment of the present invention, and table 1 is only an exemplary relationship.
TABLE 1 relationship between abrasive dust size and U2
| U2(mv) | 0 | 1-3 | 3-4 | 4-8 | ＞8 |
| Metal abrasive dust size (um) | 0-45 | 45-100 | 100-200 | 200-400 | ＞400 |
In addition, the signal processing device 2-5 can also have a counting function, and can count the times of the induced electromotive force generated in the electromagnetic induction coil so as to reflect the quantity of the grinding dust generated in the oil liquid, wherein the counted times of the induced electromotive force generation are the quantity of the grinding dust. In addition, as shown in fig. 5, three detection devices are adopted to detect the abrasive dust, and the three detection devices are connected in parallel at two ends of the same power supply U12-6. Wherein, detection device's quantity can set up according to the width of fluid cross section to guarantee to detect all fluid. In addition, a groove is reserved in the detection device and is used for storing abrasive dust, and for example, in the insulating shell, the adsorbed abrasive dust can be prevented from being brought into a part generating the abrasive dust in mechanical equipment again due to the impact of oil circulation, and the abrasion of the part is further accelerated. Wherein, the groove is a hollow pipeline of the iron core 2-3. The detection device is connected with the mechanical equipment body (namely the oil cavity) by threads, can be easily disassembled and assembled, takes the abrasive dust out of the oil cavity for crystal image inspection, and further determines the abrasion type of the component.
The following description will exemplarily describe a part for determining the health condition of the mechanical device in the determination method for determining the health condition of the mechanical device according to the embodiment of the present invention, by taking the mechanical device as the arm support rotating mechanism and taking a component generating the abrasive dust as the gear teeth. Wherein, the gear teeth rub to generate metal abrasive dust.
The metal abrasive dust is generated by long-time relative friction motion of the surface of the gear tooth in the running process of the rotating mechanism, different types of abrasive dust can be generated in different abrasion modes, and the abrasion condition of the gear tooth can be predicted to a certain extent by analyzing three-dimensional characteristic parameters and the quantity of the abrasive dust, as shown in table 2.
TABLE 2 relationship between swarf characterization and tooth wear status
| Abrasive dust characteristics | Wear state of gear teeth |
| Amount of abrasive dust | Judging whether the gear tooth wear stage is a normal wear stage or a severe wear stage |
| Size of abrasive dust | Judging whether the degree of gear tooth wear is slight pitting wear or severe cutting wear |
| Morphology of abrasive dust | Judging the type of gear tooth wear, whether it is fatigue wear or wear due to abnormal impact |
Aiming at the problem that the gear teeth are abraded and failed due to the fact that the boom rotating mechanism works for a long time or under complex working conditions such as large load, repeated start and stop and the like, the embodiment of the invention provides a method for reflecting the health condition of the boom rotating mechanism by monitoring the size characteristics of abrasive dust and the content of metal abrasive dust in oil, so that the traditional stage shutdown maintenance cost is saved, and the operation safety of the boom rotating driving mechanism is enhanced. The part for detecting the abrasive dust in the oil is used for detecting the abrasive dust in the oil in the above embodiment, specifically, the detecting device for detecting the abrasive dust in the oil in the above embodiment is installed on the outer wall of the oil cavity of the boom rotating mechanism, as shown in fig. 8, for example, threaded connection is adopted, wherein the number of the installed detecting devices can be determined according to the width of the cross section of the oil, as shown in fig. 7, three detecting devices 2 are installed on the boom rotating mechanism 1.
In the normal operation process of the arm support rotating mechanism, the operation process is relatively stable, particles of metal abrasive dust are generally smaller than 100um, and are adsorbed and identified by the detection device when oil circularly flows through the detection device 2, as shown in fig. 8, so that the abrasion state of the gear teeth of the arm support rotating mechanism is judged. When the boom rotating mechanism is started or stopped for a long time or suffers from severe working conditions to generate large impact vibration, larger abrasive dust particles exceeding 100 mu m can appear in oil, and are adsorbed when flowing through the detection device 2 along with the oil circulation, and early warning is generated.
Specifically, the determination of the health condition of the boom rotation mechanism and the wear state of the gear teeth can be understood with reference to table 3. Where U2 is the detected induced electromotive force. In addition, in this embodiment, the correspondence between the dimensional characteristics of the metal swarf and U2 is referred to table 1, the numerical values in table 3 and those in table 1 correspond to each other, and the arrangement of the detecting means in the embodiment corresponding to table 1 is the same as that in the embodiment corresponding to table 3.
TABLE 3 determination of the working state and gear tooth wear state of the boom rotating mechanism
And when the quantity of the abrasive dust reaches the wear threshold value S, the gear tooth is considered to reach the service life, wherein the threshold value S is the second preset value in the embodiment of the invention. In addition, the amount of the abrasive dusts reaching the threshold S is the amount of the abrasive dusts accumulated within the set predetermined time reaching the threshold S. The method for determining the working state of the boom rotating mechanism and the gear tooth wear state is shown in table 3. If the U2 that the detection device detected is 0, judge that cantilever crane rotary mechanism operating condition is normal work, judge that the wearing and tearing state of teeth of a cogwheel is for there being no wearing and tearing or slight wearing and tearing. In addition, in the embodiment of the invention, when the detected U2 is between 0 mV and 1mV, the working state of the arm support rotating mechanism is judged to be normal working, and the wear state of the gear teeth is judged to be no wear or light wear. If the voltage detected by the detection device is between 1mV and 3mV, the size of the detected abrasive dust is smaller than 100um, if a small amount of abrasive dust smaller than 100um is detected in oil, the gear teeth of the arm support rotating mechanism are in a normal wear state, and the arm support rotating mechanism is in a normal working state without stopping for inspection. Wherein, the small amount of the grinding dust is that the quantity of the grinding dust in the set preset time does not reach a first preset numerical value. If the voltage detected by the detection device is between 1mV and 3mV but a large amount of abrasive dust smaller than 100um is detected in oil, the abrasion state of the gear teeth is judged to be fatigue abrasion, but the arm support rotating mechanism is still in a normal working state. Wherein the quantity of the large amount of the abrasive dust reaches a first preset value within a preset time. In addition, under the condition that the gear tooth wear state is judged to be fatigue wear, the quantity of the abrasive dust is continuously judged, whether the quantity of the abrasive dust reaches a threshold value S within preset time is judged, wherein the threshold value S is larger than a first preset numerical value. If the quantity of the abrasive dust in the preset time does not reach a threshold value S, fatigue abrasion caused by insufficient lubrication of the gears or long-term work is possible, and the arm support rotating mechanism can be judged to be continuously used, but needs to be stopped for adjustment so as to be continuously used; and if the quantity of the abrasive dust reaches a threshold value S within the preset time, the gear is considered to reach the service life, and the service life of the rotating mechanism is ended. If the voltage detected by the detection device is greater than or equal to 3mV, the detection device detects abrasive dust greater than 100um in oil liquid, which indicates that the arm support rotating mechanism encounters extreme working conditions in the operation process and generates overload impact, so that gear teeth are severely worn or severely cut and worn, and the arm support rotating mechanism is judged to be in an abnormal working state and the service life of the arm support rotating mechanism is ended.
In summary, the embodiments of the present invention provide a technical solution for adsorbing the abrasive dust in the oil and monitoring the content of the metal abrasive dust, so as to monitor the wear state of the component in real time. The embodiment of the invention provides a method for judging the running state of mechanical equipment by the induced electromotive force generated by the grinding dust in the adsorbed oil and the content of metal grinding dust, so that the traditional periodic shutdown maintenance cost is saved, and the running safety of the mechanical equipment is enhanced. In the embodiment of the invention, the grinding dust is identified by the induced electromotive force generated by the adsorption of the grinding dust, and the identification is more stable compared with a conditionally closed circuit. In addition, in the embodiment of the invention, the grinding dust storage grooves are reserved in the grinding dust detection device, so that adsorbed grinding dust can be prevented from being brought between the components again due to the circulation impact of the oil liquid, and further the abrasion of the components is further accelerated. In addition, in the embodiment of the invention, the detection device for detecting the abrasive dust can be connected with the oil cavity of the mechanical equipment body by adopting threads, can be easily disassembled and assembled, and can take the abrasive dust out of the cavity for crystal image inspection to further determine the wear type of the gear teeth.
In addition, another aspect of the embodiments of the present invention provides a construction machine including the determination device described in the above embodiments.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A determination method for determining a health of a machine, the determination method comprising:
monitoring whether induced electromotive force is generated in an induced electromotive force generation module, wherein all or part of the induced electromotive force generation module is positioned in a magnetic field generated by a magnetic field generation module, and the induced electromotive force is generated by adsorbing abrasive dust in oil flowing through the magnetic field in the mechanical equipment through the magnetic field based on the magnetic field generation module;
judging whether the oil liquid contains the abrasive dust or not according to a monitoring result; and
and under the condition that the grinding dust exists in the oil liquid, judging the wear state of a part generating the grinding dust in the mechanical equipment and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the quantity of the grinding dust.
2. The judging method according to claim 1, wherein the judging the state of wear of a component of the mechanical apparatus that generates the abrasive dusts and/or the state of operation of the mechanical apparatus based on the induced electromotive force generated and/or the amount of the abrasive dusts includes at least one of:
under the condition that the induced electromotive force is within a first preset electromotive force range, judging that the part is not abraded or slightly abraded and/or judging that the mechanical equipment is in a normal working state;
under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time does not reach a first preset numerical value, judging that the part is in normal wear and/or judging that the mechanical equipment is in a normal working state;
under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in the preset time reaches a first preset value, judging that the part is in fatigue wear and/or judging that the mechanical equipment is in a normal working state; and
and under the condition that the induced electromotive force is in a third preset electromotive force range, judging that the part is in severe abrasion or severe cutting abrasion and/or judging that the mechanical equipment is in an abnormal operation state and the service life of the mechanical equipment is over, wherein the maximum value of the first preset electromotive force range is smaller than or equal to the minimum value of the second preset electromotive force range, and the maximum value of the second preset electromotive force range is smaller than or equal to the minimum value of the third preset electromotive force range.
3. The determination method according to claim 2, wherein in a case where the component is fatigue-worn, the determination method further comprises:
under the condition that the quantity in the preset time does not reach a second preset value, judging that the mechanical equipment can be continuously used, wherein the second preset value is larger than the first preset value; and/or
And determining the end of life of the component and the mechanical equipment when the number in the preset time reaches the second preset value.
4. The determination method according to any one of claims 1 to 3, characterized in that the amount of the abrasive dusts is determined based on the number of times the induced electromotive force is generated.
5. A determination device for determining a health of a machine, the determination device comprising:
the induced electromotive force monitoring module is used for monitoring whether induced electromotive force is generated in the induced electromotive force generating module, all or part of the induced electromotive force generating module is positioned in a magnetic field generated by the magnetic field generating module, and the induced electromotive force is generated by adsorbing the abrasive dust in oil flowing through the magnetic field in the mechanical equipment through the magnetic field based on the magnetic field generating module;
the abrasive dust judging module is used for judging whether the abrasive dust exists in the oil liquid or not according to a monitoring result; and
and the health judging module is used for judging the wear state of a part generating the abrasive dust in the mechanical equipment and/or the working state of the mechanical equipment according to the generated induced electromotive force and/or the quantity of the abrasive dust under the condition that the abrasive dust exists in the oil liquid.
6. The determination apparatus according to claim 5, wherein the health determination module determines the wear state of a component of the mechanical device that generates the abrasive dust and/or the operating state of the mechanical device based on the induced electromotive force and/or the amount of the abrasive dust generated includes at least one of:
under the condition that the induced electromotive force is within a first preset electromotive force range, judging that the part is not abraded or slightly abraded and/or judging that the mechanical equipment is in a normal working state;
under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in preset time does not reach a first preset numerical value, judging that the part is in normal wear and/or judging that the mechanical equipment is in a normal working state;
under the condition that the induced electromotive force is in a second preset electromotive force range and the quantity in the preset time reaches a first preset value, judging that the part is in fatigue wear and/or judging that the mechanical equipment is in a normal working state; and
and under the condition that the induced electromotive force is in a third preset electromotive force range, judging that the part is in severe abrasion or severe cutting abrasion and/or judging that the mechanical equipment is in an abnormal operation state and the service life of the mechanical equipment is over, wherein the maximum value of the first preset electromotive force range is smaller than or equal to the minimum value of the second preset electromotive force range, and the maximum value of the second preset electromotive force range is smaller than or equal to the minimum value of the third preset electromotive force range.
7. The determination device according to claim 6, wherein in the case where the component is fatigue-worn, the health determination module is further configured to:
under the condition that the quantity in the preset time does not reach a second preset value, judging that the mechanical equipment can be continuously used, wherein the second preset value is larger than the first preset value; and/or
And determining the end of life of the component and the mechanical equipment when the number in the preset time reaches the second preset value.
8. The determination device according to any one of claims 5 to 7, characterized in that the amount of the abrasive dusts is determined based on the number of times the induced electromotive force is generated.
9. A working machine, characterized in that the working machine comprises a determination device according to any one of claims 5-8.
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