阅读说明：本技术 检测磨屑的检测方法和装置、判定方法和装置及工程机械 (Method and device for detecting abrasive dust, method and device for judging abrasive dust, and engineering machinery ) 是由 佘玲娟 付玲 马德福 尹莉 于 2021-07-07 设计创作，主要内容包括：本发明涉及工程机械领域,公开了一种检测磨屑的检测方法和装置、判定方法和装置及工程机械,该检测方法包括：获取监测电路的实时电流,其中,所述监测电路中连接有磨屑吸附模块,所述磨屑吸附模块用于吸附所述油液中存在的磨屑,每当所述磨屑吸附模块吸附到所述磨屑时所述实时电流产生变化；判断所述实时电流是否产生变化；以及根据判断结果,判定所述油液中是否存在所述磨屑。藉此,实现了避免因磨屑尺寸较小或者磨屑落点不在电路连接点之间而无法连通电路的情况,降低出现漏检的概率,提高可靠性。(The invention relates to the field of engineering machinery, and discloses a method and a device for detecting abrasive dust, a method and a device for judging abrasive dust and engineering machinery, wherein the method for detecting the abrasive dust comprises the following steps: acquiring real-time current of a monitoring circuit, wherein the monitoring circuit is connected with an abrasive dust adsorption module, the abrasive dust adsorption module is used for adsorbing abrasive dust existing in the oil, and the real-time current changes when the abrasive dust adsorption module adsorbs the abrasive dust; judging whether the real-time current changes or not; and judging whether the abrasive dust exists in the oil liquid or not according to the judgment result. Therefore, the situation that the circuit cannot be communicated due to the fact that the abrasive dust is small in size or the abrasive dust falling point is not located between the circuit connection points is avoided, the probability of missing detection is reduced, and reliability is improved.)

1. A detection method for detecting abrasive dust in oil is characterized by comprising the following steps:

acquiring real-time current of a monitoring circuit, wherein the monitoring circuit is connected with an abrasive dust adsorption module, the abrasive dust adsorption module is used for adsorbing abrasive dust existing in the oil, and the real-time current changes when the abrasive dust adsorption module adsorbs the abrasive dust;

judging whether the real-time current changes or not; and

and judging whether the abrasive dust exists in the oil liquid or not according to the judgment result.

2. The detection method according to claim 1, wherein the abrasive dust adsorption module is configured to generate a first magnetic field under the action of a second magnetic field, and the abrasive dust adsorption module adsorbs the abrasive dust present in the oil flowing through the first magnetic field by the first magnetic field.

3. The detection method according to claim 2, wherein the second magnetic field is generated by a second magnetic field generation module for generating the second magnetic field under energization.

4. A determination method for determining a health of a machine, the determination method comprising:

the detection method according to any one of claims 1 to 3, detecting whether or not there is abrasive dust in oil of the oil chamber of the mechanical equipment; 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 quantity of the grinding dust.

5. The method according to claim 4, wherein the monitoring circuit includes a small-chip-monitoring circuit in which the size of the abrasive dust adsorbed by the abrasive dust adsorption module is smaller than a first preset value, and a large-chip-monitoring circuit in which the size of the abrasive dust adsorbed by the abrasive dust adsorption module is greater than or equal to the first preset value, and the determination of the wear state of a component of the machine that generates the abrasive dust and/or the operating state of the machine based on the amount of the abrasive dust includes at least one of:

in case only the real-time current of the small swarf monitoring circuit is changed,

if the quantity of the abrasive dust does not reach a second preset value, judging that the part is in a normal wear state and/or the mechanical equipment is in a normal working state; and/or

If the quantity of the abrasive dust reaches the second preset value, judging that the part is in a fatigue wear state and/or the mechanical equipment is in a normal working state; and

and under the condition that the real-time current of the large abrasive dust monitoring circuit changes, judging that the part is in a severe abrasion state/severe cutting abrasion state and/or the mechanical equipment is in an abnormal operation state.

6. The judging method according to claim 4 or 5, characterized in that the amount of the abrasive dusts is determined based on the number of times the real-time current is changed.

7. A detection device for detecting abrasive dust in oil, characterized in that, this detection device includes:

the system comprises a real-time current acquisition module, a monitoring circuit and a grinding dust adsorption module, wherein the real-time current acquisition module is used for acquiring the real-time current of the monitoring circuit, the monitoring circuit is connected with the grinding dust adsorption module, the grinding dust adsorption module is used for adsorbing grinding dust existing in oil, and the real-time current changes when the grinding dust adsorption module adsorbs the grinding dust; and

a swarf determination module for:

judging whether the real-time current changes or not; and

and judging whether the abrasive dust exists in the oil liquid or not according to the judgment result.

8. The detection device according to claim 7, wherein the abrasive dust adsorption module is configured to generate a first magnetic field under the action of a second magnetic field, and the abrasive dust adsorption module adsorbs the abrasive dust present in the oil flowing through the first magnetic field by the first magnetic field.

9. The detecting device for detecting the rotation of the motor rotor according to the claim 8, wherein the second magnetic field is generated by a second magnetic field generating module for generating the second magnetic field under the effect of electrification.

10. A determination device for determining a health of a machine, the determination device comprising:

the detection device of any one of claims 7-9; and

and the health judgment 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 quantity of the abrasive dust under the condition that the abrasive dust exists in the oil liquid.

11. The apparatus according to claim 10, wherein the monitoring circuit includes a small-chip-monitoring circuit in which a size of the abrasive dust adsorbed by the abrasive dust adsorption module is smaller than a first preset value, and a large-chip-monitoring circuit in which a size of the abrasive dust adsorbed by the abrasive dust adsorption module is greater than or equal to the first preset value, and the health determination module determines the wear state of a component of the machine that generates the abrasive dust and/or the operating state of the machine based on the number of the abrasive dust includes at least one of:

in case only the real-time current of the small swarf monitoring circuit is changed,

if the quantity of the abrasive dust does not reach a second preset value, judging that the part is in a normal wear state and/or the mechanical equipment is in a normal working state; and/or

If the quantity of the abrasive dust reaches the second preset value, judging that the part is in a fatigue wear state and/or the mechanical equipment is in a normal working state; and

and under the condition that the real-time current of the large abrasive dust monitoring circuit changes, judging that the part is in a severe abrasion state/severe cutting abrasion state and/or the mechanical equipment is in an abnormal operation state.

12. The determination device according to claim 10 or 11, wherein the amount of the abrasive dust is determined based on the number of times the real-time current is changed.

13. A working machine, characterized in that the working machine comprises:

the detection device of any one of claims 7-9; and/or

The determination device as set forth in any one of claims 10 to 12.

Technical Field

The invention relates to the field of engineering machinery, in particular to a method and a device for detecting abrasive dust, a method and a device for judging abrasive dust and 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 method and a device for detecting abrasive dust, a method and a device for determining abrasive dust, and a construction machine, which solve or at least partially solve the above-mentioned problems.

In order to achieve the above object, an aspect of the present invention provides a detection method for detecting abrasive dust in oil, the detection method including: acquiring real-time current of a monitoring circuit, wherein the monitoring circuit is connected with an abrasive dust adsorption module, the abrasive dust adsorption module is used for adsorbing abrasive dust existing in the oil, and the real-time current changes when the abrasive dust adsorption module adsorbs the abrasive dust; judging whether the real-time current changes or not; and judging whether the abrasive dust exists in the oil liquid or not according to the judgment result.

Optionally, the abrasive dust adsorption module is configured to generate a first magnetic field under the action of a second magnetic field, and the abrasive dust adsorption module adsorbs the abrasive dust existing in the oil flowing through the first magnetic field by the first magnetic field.

Optionally, the second magnetic field is generated by a second magnetic field generation module for generating the second magnetic field under the effect of energization.

Further, another aspect of the present invention provides a determination method for determining a health condition of a mechanical apparatus, the determination method including: detecting whether abrasive dust exists in oil liquid of the oil chamber of the mechanical equipment according to the detection method; and under the condition that the grinding chips exist in the oil liquid, judging the wear state of a part generating the grinding chips in the mechanical equipment and/or the working state of the mechanical equipment according to the quantity of the grinding chips.

Optionally, the monitoring circuit includes a small abrasive dust monitoring circuit and a large abrasive dust monitoring circuit, the size of the abrasive dust adsorbed by the abrasive dust adsorption module in the small abrasive dust monitoring circuit is smaller than a first preset value, the size of the abrasive dust adsorbed by the abrasive dust adsorption circuit in the large abrasive dust monitoring circuit is greater than or equal to the first preset value, and the determining, according to the amount of the abrasive dust, the wear state of a component of the mechanical equipment generating the abrasive dust and/or the working state of the mechanical equipment includes at least one of: under the condition that only the real-time current of the small abrasive dust monitoring circuit changes, if the quantity of the abrasive dust does not reach a second preset value, the component is judged to be in a normal wear state and/or the mechanical equipment is judged to be in a normal working state; and/or if the quantity of the abrasive dust reaches the second preset value, judging that the part is in a fatigue wear state and/or the mechanical equipment is in a normal working state; and under the condition that the real-time current of the large abrasive dust monitoring circuit changes, judging that the part is in a severe abrasion state/severe cutting abrasion state and/or the mechanical equipment is in an abnormal operation state.

Optionally, the amount of abrasive dust is determined based on a number of times the real-time current is varied.

Accordingly, another aspect of the present invention also provides a device for detecting abrasive dust in oil, including: the system comprises a real-time current acquisition module, a monitoring circuit and a grinding dust adsorption module, wherein the real-time current acquisition module is used for acquiring the real-time current of the monitoring circuit, the monitoring circuit is connected with the grinding dust adsorption module, the grinding dust adsorption module is used for adsorbing grinding dust existing in oil, and the real-time current changes when the grinding dust adsorption module adsorbs the grinding dust; and a wear debris determination module for: judging whether the real-time current changes or not; and judging whether the abrasive dust exists in the oil liquid or not according to the judgment result.

Optionally, the abrasive dust adsorption module is configured to generate a first magnetic field under the action of a second magnetic field, and the abrasive dust adsorption module adsorbs the abrasive dust existing in the oil flowing through the first magnetic field by the first magnetic field.

Optionally, the second magnetic field is generated by a second magnetic field generation module for generating the second magnetic field under the effect of energization.

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 above-described detection device; and the health judgment 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 quantity of the abrasive dust under the condition that the abrasive dust exists in the oil liquid.

Optionally, the monitoring circuit includes a small abrasive dust monitoring circuit and a large abrasive dust monitoring circuit, the size of the abrasive dust adsorbed by the abrasive dust adsorption module in the small abrasive dust monitoring circuit is smaller than a first preset value, the size of the abrasive dust adsorbed by the abrasive dust adsorption circuit in the large abrasive dust monitoring circuit is greater than or equal to the first preset value, and the health determination module determines, according to the amount of the abrasive dust, the wear state of a component of the mechanical equipment that generates the abrasive dust and/or the working state of the mechanical equipment, and includes at least one of: under the condition that only the real-time current of the small abrasive dust monitoring circuit changes, if the quantity of the abrasive dust does not reach a second preset value, the component is judged to be in a normal wear state and/or the mechanical equipment is judged to be in a normal working state; and/or if the quantity of the abrasive dust reaches the second preset value, judging that the part is in a fatigue wear state and/or the mechanical equipment is in a normal working state; and under the condition that the real-time current of the large abrasive dust monitoring circuit changes, judging that the part is in a severe abrasion state/severe cutting abrasion state and/or the mechanical equipment is in an abnormal operation state.

Optionally, the amount of abrasive dust is determined based on a number of times the real-time current is varied.

In addition, another aspect of the present invention provides a construction machine including: the above-described detection device; and/or the above-described determination device.

Through the technical scheme, whether change according to the real-time current of the monitoring circuit who obtains determines whether there is the abrasive dust in the fluid, thereby its resistance changes when adsorbing the abrasive dust in the monitoring circuit arouses that real-time current produces the change, so, adsorb through the abrasive dust to in the fluid and detect whether there is the abrasive dust in the fluid, need not the intercommunication circuit, as long as there is the abrasive dust in the fluid just can adsorb, can avoid because of the less or abrasive dust falling point of abrasive dust size is not between the circuit connection point and the unable condition of intercommunication circuit, the probability of lou examining appears in the reduction, reliability is improved.

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 flowchart of a detection method for detecting abrasive dust in oil according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an abrasive dust adsorbing device for adsorbing abrasive dust according to another embodiment of the present invention;

fig. 5 is a schematic circuit diagram of an abrasive dust adsorbing device according to another embodiment of the present invention;

FIG. 6 is a flow chart of a determination method for determining a health of a piece of machinery provided in accordance with another embodiment of the present invention;

fig. 7 is a schematic view illustrating an installation of an abrasive dust adsorbing device on a boom rotating mechanism according to another embodiment of the present invention;

fig. 8 is a schematic view illustrating an installation of the abrasive dust adsorbing device on the arm support rotating mechanism according to another embodiment of the present invention;

FIG. 9 is a logic diagram for determining a health of a machine based on the detection of small abrasive swarf, according to another embodiment of the present invention;

FIG. 10 is a schematic diagram of logic provided in accordance with another embodiment of the present invention for determining the health of a machine based on the detection of large abrasive dust; and

fig. 11 is a block diagram illustrating a structure of a device for detecting abrasive dust in oil according to another embodiment of the present invention.

Description of the reference numerals

1 arm support rotating mechanism and 2 abrasive dust adsorption device

2-1 connector 2-2 insulating shell

2-3 iron core 2-1-1 wire winding wire socket

2-1-2 monitoring circuit plug 2-2-1 wire winding

2-2-2 wire winding wire plug 2-4 wire winding circuit resistor R1

2-5 monitoring circuit resistor R22-6 wire winding circuit current detection module

2-7 monitoring circuit current detection module 2-8 wire winding circuit power supply U1

2-9 monitoring circuit power supply U22-10 gear tooth wear judgment module

3 small abrasive dust adsorption device and 4 large abrasive dust adsorption device

5 real-time current acquisition module 6 abrasive dust judgment 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

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.

During operation of the mechanical equipment, wear of the components can produce abrasive dust that is deposited in the lubrication cavity of the mechanical equipment. The embodiment of the invention provides a device and a method for reflecting the health condition of mechanical equipment by detecting the content change of abrasive dust and/or the size of the abrasive dust in oil, which can monitor and analyze the abrasion and vibration conditions of parts in the operation process of the mechanical equipment in real time, judge the health condition of the mechanical equipment and effectively monitor and early warn the health condition of the mechanical equipment in real time.

One aspect of the embodiments of the present invention provides a method for detecting abrasive dust in oil.

Fig. 3 is a flowchart of a method for detecting abrasive dust in oil according to an embodiment of the present invention. As shown in fig. 3, the detection method includes the following.

In step S30, a real-time current of the monitoring circuit is obtained, wherein the monitoring circuit is connected with an abrasive dust adsorption module, the abrasive dust adsorption module is used for adsorbing abrasive dust existing in the oil, and the real-time current changes whenever the abrasive dust adsorption module adsorbs the abrasive dust. When the abrasive dust adsorption module adsorbs abrasive dust, the resistance of the abrasive dust adsorption module in the monitoring circuit changes, so that the real-time current changes. Alternatively, whether the real-time current changes may be comparing it with an initial current, wherein the initial current is the current of the monitoring circuit when the abrasive dust adsorbing module does not adsorb the abrasive dust. In a monitoring circuit, when the abrasive dust adsorption module adsorbs the abrasive dust, the resistance of abrasive dust adsorption module in the monitoring circuit includes the circuit of abrasive dust, compares in not adsorbing the resistance production change of abrasive dust adsorption module in the monitoring circuit when the abrasive dust, and consequently, real-time current can change. In addition, whether the real-time current changes or not can also be that the newly acquired real-time current is compared with the last acquired real-time current. When the real-time current is obtained again, the changed real-time current is obtained, and the real-time current obtained again is compared with the real-time current obtained last time, so that the real-time current change can be found, and the abrasive dust is adsorbed by the abrasive dust adsorption module. In addition, in the embodiment of the invention, one or more abrasive dust adsorption modules can be connected in a monitoring circuit, and the number of the abrasive dust adsorption modules can be determined according to the width of the cross section of the oil liquid, so that the detection range can cover the whole cross section of the oil liquid, and the phenomenon of missing detection is avoided. In addition, no matter how many abrasive dust adsorption modules are connected with a monitoring circuit, the abrasive dust adsorption modules are connected in parallel, and the real-time current and the initial current are the main circuit current of the monitoring circuit.

In step S31, it is determined whether or not the real-time current has changed. Optionally, it is determined whether the real-time current changes from the initial current, the current value of the initial current is subtracted from the current value of the real-time current to obtain a difference, and it is determined whether the difference is zero. Optionally, it is determined whether the latest obtained real-time current changes from the last obtained real-time current, the current value of the latest obtained real-time current is subtracted from the current value of the last obtained real-time current to obtain a difference, and it is determined whether the difference is zero.

In step S32, it is determined whether or not there is any abrasive dust in the oil liquid based on the determination result. When the real-time current is not changed, the abrasion dust adsorption module does not adsorb abrasion dust, and the oil liquid is judged to have no abrasion dust; when the real-time current changes, the abrasion dust adsorption module is used for adsorbing abrasion dust, and the abrasion dust is judged to exist in the oil liquid.

Through the technical scheme, whether change according to the real-time current of the monitoring circuit who obtains determines whether there is the abrasive dust in the fluid, thereby its resistance changes when adsorbing the abrasive dust in the monitoring circuit arouses that real-time current produces the change, so, adsorb through the abrasive dust to in the fluid and detect whether there is the abrasive dust in the fluid, need not the intercommunication circuit, as long as there is the abrasive dust in the fluid just can adsorb, can avoid because of the less or abrasive dust falling point of abrasive dust size is not between the circuit connection point and the unable condition of intercommunication circuit, the probability of lou examining appears in the reduction, reliability is improved.

Optionally, in an embodiment of the present invention, the abrasive dust adsorption module is configured to generate a first magnetic field under the action of a second magnetic field, and the abrasive dust adsorption module adsorbs abrasive dust present in the oil flowing through the first magnetic field by the first magnetic field. For example, the abrasive dust adsorption module may be an iron core.

Optionally, in an embodiment of the present invention, the second magnetic field is generated by a second magnetic field generating module for generating the second magnetic field under an energizing action. For example, the second magnetic field generating module is a wire winding, and the wire winding is electrified to generate a second magnetic field. Specifically, the second magnetic field may be generated under the action of an alternating current or a direct current.

Fig. 4 is a schematic structural view of an abrasive dust adsorbing device for adsorbing abrasive dust according to another embodiment of the present invention, and fig. 5 is a schematic circuit diagram of the abrasive dust adsorbing device according to another embodiment of the present invention. In the embodiment of the present invention, the grinding dust adsorption device does not include only the grinding dust adsorption module, and the monitoring circuit does not include only the grinding dust adsorption module, and components that can be connected to the grinding dust adsorption device and the monitoring circuit are described below with reference to fig. 4 and 5. In this embodiment, the abrasive dust adsorbing module is an iron core, and the second magnetic field generating module is a wire winding. The power supply supplies power to the wire winding, and the wire winding generates a magnetic field to magnetize the iron core; after being magnetized, the iron core generates a magnetic field, and the iron core adsorbs abrasive dust in oil liquid flowing through the magnetic field generated by the iron core; after the iron core is adsorbed, the resistance of the iron core in the monitoring circuit changes, so that the current of the monitoring circuit changes; and detecting the change of the current of the monitoring circuit, and judging that the oil liquid contains abrasive dust. In addition, in the embodiment, the abrasive dust of the oil in the oil cavity of the arm support rotating mechanism is detected, in the arm support rotating mechanism, the abrasive dust generated by vibration impact or abrasion of the gear teeth enters the oil circulation, and the metal abrasive dust generated by abrasion of the gear teeth is metal abrasive dust.

As shown in figure 4, the abrasive dust adsorption device mainly comprises a connector 2-1, an insulating shell 2-2, an iron core 2-3, a wire winding wire socket 2-1-1, a monitoring circuit plug 2-1-2, a wire winding 2-2-1 and a wire winding wire plug 2-2-2. The insulating shell 2-2 is screwed into the outer wall of the lubricating oil cavity through threaded connection, the wire winding 2-2-1 is arranged in the insulating shell 2-2 and is connected with a wire winding wire socket 2-1-1 on the connector 2-1 through a wire winding wire plug 2-2-2; then, an external power supply circuit is connected to the wire winding wire socket 2-1-1 to form a closed loop to supply power to the wire winding 2-2-1, for example, as shown in fig. 5, a wire winding circuit power supply U12-8 supplies power to the wire winding 2-2-1, and is connected to the wire winding wire socket 2-1-1 through a wire winding circuit resistor R12-4; in addition, a lead winding circuit current detection module 2-6 is connected in the circuit, and the lead winding circuit current detection module 2-6 is used for detecting current. In addition, in the embodiment of the invention, in the power supply circuit of the wire winding circuit power supply U12-8, one or more wire windings 2-2-1 may be connected, each abrasive dust adsorption device includes one wire winding 2-2-1, the power supply circuit of the wire winding circuit power supply U12-8 is connected with several wire windings 2-2-1 corresponding to several abrasive dust adsorption devices, as shown in fig. 5, the wire winding circuit power supply U12-8 corresponds to three abrasive dust adsorption devices, that is, the wire winding circuit power supply U12-8 supplies power to three wire windings 2-2-1, wherein the three wire windings 2-2-1 are connected in parallel. In addition, no matter the wire-winding circuit power supply U12-8 supplies power to several wire windings 2-2-1, the wire-winding circuit current detection module 2-6 detects the main current of the wire-winding circuit power supply U12-8. The lower end of the trapezoidal iron core 2-3 can increase the iron chip adsorption area, the upper part of the trapezoidal iron core is of an external thread structure and is fixedly connected with the insulating shell 2-2 by threads, two monitoring circuit plugs 2-1-2 are arranged on the connector 2-1 and are connected with the iron core 2-3, specifically, two iron core sockets are arranged on the iron core 2-3, and the monitoring circuit plugs 2-1-2 are inserted into the iron core sockets; the external power supply circuit is connected to the monitoring circuit plug 2-1-2 to form a monitoring circuit to detect the generation of the abrasive dust by the change of the real-time current of the monitoring circuit compared to the initial current, and as shown in fig. 5, a monitoring circuit power supply U22-9 is connected to the monitoring circuit plug 2-1-2 through a monitoring circuit resistor 2-5 to be connected to the core 2-3 to form a closed loop. Similarly, in the embodiment of the invention, one or more iron cores 2-3 can be connected in the power supply circuit of the monitoring circuit power supply U22-9, that is, one or more iron cores 2-3 can be connected in the monitoring circuit, each abrasive dust adsorption device comprises one iron core 2-3, and the connection of several iron cores 2-3 to the power supply circuit of the monitoring circuit power supply U22-9 corresponds to several abrasive dust adsorption devices. As shown in FIG. 5, the monitoring circuit power supply U22-9 corresponds to three abrasive dust adsorption devices, that is, the monitoring circuit power supply U22-9 is connected with three iron cores 2-3, wherein the three iron cores 2-3 are connected in parallel. In addition, no matter the monitoring circuit power supply U22-9 is connected with a plurality of iron cores 2-3, the monitoring circuit current detection module 2-7 detects the main circuit current of the monitoring circuit power supply U12-8, namely detects the main circuit current of the monitoring circuit. It should be noted that the wire winding circuit resistor, the monitoring circuit resistor, the wire winding circuit power supply, the monitoring circuit power supply, the wire winding circuit current detection module, and the monitoring circuit current detection module used in the embodiments of the present invention are all power supply, resistor, and current detection devices that are common in the art.

As shown in figure 5, when whether the oil liquid contains abrasive dust or not is detected, power is supplied through a wire winding circuit power supply U12-8, current forms a closed loop through a wire winding circuit resistor R12-4 and a wire winding 2-2-1, the wire winding 2-2-1 generates a magnetic field to magnetize an iron core 2-3, and the iron core 2-3 generates the magnetic field and adsorbs the abrasive dust through the magnetic field generated by the magnetic field. The current in the circuit can be checked through the wire winding circuit current detection module 2-6, and the strength of the iron core capacity of adsorbing abrasive dust can be realized by controlling the current of the wire winding circuit through adjusting the wire winding circuit resistor R12-4. The strong and weak ability of the iron core to absorb the abrasive dust is shown in how large the size of the abrasive dust can be absorbed. Specifically, the electromagnetic attraction force is calculated according to the following formula:the magnetic flux passing through the polarized surface of the iron core, S is the area of the polarized surface of the iron core, delta is the distance between the abrasive dust and the adsorption surface, and alpha is a correction coefficient and is generally between 3 and 4. In addition, the first and second substrates are,i is the current value (as shown in FIG. 5, I is the current of the branch where the wire winding circuit resistor R12-4 is located), W is the number of turns of the wire winding coil, G is the current of the branch where the wire winding circuit resistor R12-4 is located_δIn order to be a magnetic guide, the magnetic guide,R₀length of armature rotation position to core center, mu₀Is magnetic permeability of 0.4 pi e^-8H and r are the radii of the polarization planes. Consider abrasive dust asIs a sphere, utilizeAnd calculating R, wherein R is the size of the abrasive dust. Referring to fig. 5, when the current in the circuit is 0.08A when the wire winding circuit power supply U12-8 is 12V and the wire winding circuit resistance R12-4 is set to 150 Ω, the iron core can absorb abrasive dust of 100um size. The iron core 2-3 is connected in a monitoring circuit through a monitoring circuit plug 2-1-2, the monitoring circuit is powered by a monitoring circuit power supply U22-9, and a closed loop is formed by the monitoring circuit power supply U22-9, a monitoring circuit resistor R22-5, the iron core 2-3 and a monitoring circuit current detection module 2-7. The gear teeth enter oil liquid circulation because of abrasive dust generated by vibration impact or abrasion, and is adsorbed by the iron core 2-3 when passing through the abrasive dust adsorption device, if the resistance of the iron core 2-3 is R3, the resistance of the abrasive dust is R4, the readings of the monitoring circuit current detection modules 2-7 before the abrasive dust is adsorbed are I2, the readings of the monitoring circuit current detection modules 2-7 after the abrasive dust is adsorbed are I3, and the variation of the readings of the monitoring circuit current detection modules 2-7 is delta I, then: it should be noted that, in the above formula for calculating the current variation, it is considered that the resistances of the abrasive dusts adsorbed by the iron cores in the three abrasive dust adsorption devices are the same, but actually, in the monitoring circuit including a plurality of abrasive dust adsorption devices, the resistances of the abrasive dusts adsorbed by a plurality of abrasive dust adsorption modules may be the same or different, and may be partially the same or partially non-conductive, and so on.

In summary, 1) in the embodiment of the invention, the abrasive dust adsorption device mainly comprises the innovatively designed connector, the insulation shell, the iron core, the wire winding wire socket, the monitoring circuit plug, the wire winding and the wire winding wire plug, and the threaded connection and plug-in type assembly mode enables the abrasive dust adsorption device to be more compact in structure, smaller in volume and more convenient to install; 2) whether have the abrasive dust to discern in the fluid through adsorbing the abrasive dust and according to the change of the electric current of the monitoring circuit of abrasive dust adsorption module place, compare closed circuit conditional among the prior art more stable, better to the discernment effect whether have the abrasive dust, it is more practical.

In addition, another aspect of the embodiments of the present invention provides a determination method for determining a health condition of a mechanical device.

FIG. 6 is a flow chart of a determination method for determining a health of a machine in accordance with another embodiment of the present invention. As shown in fig. 6, the determination method includes the following.

In step S60, whether or not there are abrasive dusts in the oil liquid of the oil chamber of the machine equipment is detected, specifically, whether or not there are abrasive dusts in the oil liquid of the oil chamber of the machine equipment is detected according to the detection method for detecting abrasive dusts in the oil liquid described in the above embodiment. The oil flows in an oil 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. In the case where the oil of the oil chamber of the mechanical apparatus has the abrasive dust, executing step S61; in the case where no abrasive dust is present in the oil liquid of the oil chamber of the mechanical equipment, the execution proceeds to step S60.

In step S61, the wear state of the components of the machine that generate the abrasive dust and/or the operating state of the machine are determined based on the amount of the abrasive dust. Wherein the amount of abrasive dust is determined based on the number of times the current is varied in real time. The method described in the reference example judges the change of the real-time current, each time the real-time current changes once, the number of the abrasive dust is accumulated several times when the real-time current changes several times, and the number of the real-time current changes is the number of the abrasive dust.

Through the technical scheme, under the condition that the grinding chips are generated in the oil liquid, the abrasion state of the part generating the grinding chips in the mechanical equipment and/or the working state of the mechanical equipment are judged according to the quantity of the grinding chips, so that the health condition of the mechanical equipment is judged.

Alternatively, in the embodiment of the present invention, two monitoring circuits may be used to adsorb the grinding dust, and the wear state of the component and/or the working state of the mechanical equipment may be determined according to the amount of the grinding dust corresponding to each of the two monitoring circuits. Wherein, two monitoring circuit are big abrasive dust monitoring circuit and little abrasive dust monitoring circuit, monitor the great abrasive dust of size and the less abrasive dust of size in the fluid respectively, and the size of the abrasive dust that the abrasive dust adsorption module among the little abrasive dust monitoring circuit adsorbed is less than first default, and the size of the abrasive dust that the abrasive dust adsorption circuit among the big abrasive dust monitoring circuit adsorbed is greater than or equal to first default. Optionally, in the embodiment of the invention, in the case that the abrasive dust adsorption module generates the first magnetic field under the action of the second magnetic field to adsorb the abrasive dust in the oil liquid through the first magnetic field, the adsorption of larger abrasive dust and smaller abrasive dust can be controlled by adjusting the magnitude of the second magnetic field. Preferably, in the case that the second magnetic field is generated by the second magnetic field generating module for generating the second magnetic field under the action of energization, the different sizes of the abrasive dust adsorbed by the different abrasive dust adsorbing modules can be realized by controlling the magnitude of the current of the circuit of the second magnetic field generating module. For example, referring to the related contents described in the above embodiments, the method is implemented by adjusting the size of the wire winding circuit resistance of the circuit in which the wire winding is located. Specifically, the size of the abrasive dusts adsorbed to the abrasive dust adsorption module may be controlled with reference to the method described in the above embodiment. The determination of the wear state of the components of the mechanical equipment generating the abrasive dust and/or the working state of the mechanical equipment according to the amount of the abrasive dust includes at least one of: under the condition that only the real-time current of the small abrasive dust monitoring circuit changes, if the quantity of the abrasive dust does not reach a second preset value, the component is judged to be in a normal wear state and/or the mechanical equipment is judged to be in a normal working state; and/or the quantity of the abrasive dust reaches a second preset value, judging that the part is in a fatigue wear state and/or the mechanical equipment is in a normal working state; and under the condition that the real-time current of the large abrasive dust monitoring circuit changes, judging that the part is in a severe abrasion state/a severe cutting abrasion state and/or the mechanical equipment is in an abnormal operation state.

The following describes an exemplary determination method for determining the health condition of mechanical equipment according to an embodiment of the present invention, taking mechanical equipment as an arm support rotating mechanism and taking a component generating abrasive dust as a gear tooth. Further, in this embodiment, the abrasive dust adsorption module is an iron core.

Aiming at the problem that the gear teeth are worn and failed due to the fact that a novel arm support rotating mechanism is prone to generate large vibration impact under complex working conditions such as large load, repeated start and stop and the like for a long time, the embodiment of the invention provides a method for reflecting the health condition of the rotating mechanism by monitoring the content change of abrasive dust in oil. The method for detecting the abrasive dust in the oil is used for detecting the abrasive dust in the oil in the above embodiment, specifically, the abrasive dust adsorption device 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, by using a threaded connection. In addition, in this embodiment, a small abrasive dust adsorption device 3 that adsorbs small abrasive dust and a large abrasive dust adsorption device 4 that adsorbs large abrasive dust are used. In addition, the number of the abrasive dust adsorption devices for adsorbing abrasive dust of a certain size can be determined according to the width of the cross section of the oil, as shown in fig. 7, three abrasive dust adsorption devices 2 are installed on the boom rotating mechanism 1 for adsorbing abrasive dust of a certain size, and a specific circuit connection relationship can be shown in fig. 5. According to the above, when the abrasive dust adsorbing device shown in fig. 4 and the circuit connection relationship shown in fig. 5 are used to detect abrasive dust, when the wire winding circuit power supply U12-8 is 12V and the wire winding circuit resistance R12-4 is set to 150 Ω, the current in the circuit is 0.08A, and the iron core can adsorb abrasive dust with a size of 100 um. Can set up the first default in this application to 100um, little abrasive dust adsorption equipment 3 adsorbs the metal abrasive dust size and is less than 100um, and the metal abrasive dust size that big abrasive dust adsorption equipment 4 adsorbs is greater than or equal to 100 um. Specifically, the relationship between the resistance value of the wire winding circuit resistor R12-4 corresponding to the small abrasive dust adsorption device 3 and the large abrasive dust adsorption device 4, respectively, and the size of the adsorbed metal abrasive dust is shown in table 1.

TABLE 1

Name (R)	R1(Ω)	Metal abrasive dust size (um)
			Small abrasive dust adsorption device	＞150(±5％)	＜100(±8％)
Large abrasive dust adsorption device	≤150(±5％)	≥100(±8％)

Specifically, in this embodiment, when the health condition of the mechanical equipment is determined, the abrasive dust adsorption device and the corresponding circuit element are used, the three abrasive dust adsorption devices are arranged in one group, that is, the small abrasive dust adsorption device 3 has three, the large abrasive dust adsorption device 4 has three, the three small abrasive dust adsorption devices 3 and the three large abrasive dust adsorption devices 4 are in threaded connection with the outer wall of the circulation oil cavity of the boom rotating mechanism, the three small abrasive dust adsorption devices 3 are connected in parallel, and the three large abrasive dust adsorption devices 4 are connected in parallel. Little abrasive dust adsorbs monitoring devices 3 and big abrasive dust adsorbs monitoring devices 4 and becomes 90 contained angles and arranges, and the structure is the same, but the magnetic force is strong and weak different, can realize separating the absorption to big or small abrasive dust. It should be noted that, in fig. 8, if the oil liquid circulation direction is counterclockwise, the oil liquid passes through the abrasive dust adsorption device indicated by reference numeral 3 first, then passes through the abrasive dust adsorption device indicated by reference numeral 4, and according to the principle that small abrasive dust is adsorbed first and then large abrasive dust is adsorbed, the abrasive dust adsorption device indicated by reference numeral 3 is set to be the small abrasive dust adsorption device and the abrasive dust adsorption device indicated by reference numeral 4 is set to be the large abrasive dust adsorption device by adjusting the current. Therefore, the abrasive dust adsorption device with the reference numeral 3 can only adsorb metal abrasive dust with the size below 100um, and is a small abrasive dust adsorption device, and the abrasive dust adsorption device with the reference numeral 4 can adsorb metal abrasive dust with the size above 100um, and is a large abrasive dust adsorption device. If the oil liquid circulation direction is clockwise, according to the principle that small abrasive dust is adsorbed firstly and then large abrasive dust is adsorbed, the abrasive dust adsorption device with the reference number 3 is set to be a large abrasive dust adsorption device and the abrasive dust adsorption device with the reference number 4 is set to be a small abrasive dust adsorption device by adjusting the current.

In the normal operation process of the arm support rotating mechanism, the operation process is relatively stable, the size of abrasive dust is smaller than 100um, and the abrasive dust flows through the small abrasive dust adsorption device 3 along with the circulation flow of oil liquid to be adsorbed. When the mechanism is opened and shut down for a long time or meets with the severe operating mode and produces big impact vibration, can appear great abrasive dust granule in the fluid, the size exceeds 100um, and little abrasive dust adsorption equipment 3 can't adsorb, is adsorbed when flowing through big abrasive dust adsorption equipment 4 along with fluid circulation to take place the early warning. The positions of the small abrasive dust adsorption device 3 and the large abrasive dust adsorption device 4 are provided with abrasive dust storage grooves, so that adsorbed abrasive dust can be prevented from being brought between gear teeth again due to oil circulation impact, and further the abrasion of the gear teeth is aggravated. The small abrasive dust adsorption device 3 and the large abrasive dust adsorption device 4 are connected with the arm support rotating mechanism body through threads, can be easily disassembled and assembled, and remove abrasive dust from the hydraulic cavity, so that further aggravation of abrasion is prevented.

According to the related contents described in the above embodiments, the number of times N of change of the real-time current of the small abrasive dust monitoring circuit in which the iron core of the small abrasive dust adsorption device 3 is located is determined₁The change times N of the real-time current of the large abrasive dust monitoring circuit where the iron core in the large abrasive dust adsorption device 4 is positioned₂. Obtaining the current change times (N) of the arm support rotating mechanism in the normal working state through a plurality of test tests]As a threshold value for the wear state of the gear teeth, i.e., the second preset value described in the embodiment of the present invention, the gear tooth wear determination module 2-10 has the same configuration as that of the gear tooth wear determination moduleThe following criteria (see table 2):

1) if only the iron core in the small abrasive dust adsorption device 3 adsorbs the metal abrasive dust, the current change frequency is N₁And N is₁<[N]The gear teeth of the arm support rotating mechanism are in a normal abrasion state, and the mechanism runs normally and stably; if N is present₁≥[N]If the gear teeth of the boom rotating mechanism are in a fatigue wear state, the gear tooth wear judgment modules 2 to 10 perform red early warning, and send a stop signal to the boom rotating mechanism hydraulic control system to remind a worker to overhaul the boom rotating mechanism and eliminate hidden dangers, and the logical principle is shown in fig. 9.

2) If the iron core in the large abrasive dust adsorption device 4 adsorbs metal abrasive dust, the current change frequency is N₂，N₂If the alarm signal is more than 0, the alarm signal indicates that the boom rotating mechanism encounters extreme working conditions in the operation process and generates overload impact, so that gear teeth are severely worn or severely abraded, the gear tooth abrasion judgment module 2-10 performs red early warning and sends a stop signal to a boom rotating mechanism hydraulic control system, the service life of the boom rotating mechanism is ended, and the logic principle is as shown in fig. 10.

TABLE 2 determination of the working state and gear tooth wear state of the boom rotating mechanism

In summary, in the technical solutions provided in the embodiments of the present invention, 1) a device and a method for reflecting the wear state of the gear teeth in real time by monitoring the content of metal abrasive dust in oil are implemented, and a gear tooth wear state determination device can accurately detect and pre-warn the gear tooth wear condition of the boom rotation mechanism, thereby implementing health monitoring of the boom rotation mechanism; 2) two groups of abrasive dust adsorption devices are adopted, and through a plurality of tests, the relationship between the resistance value of a wire winding resistor and the size of metal abrasive dust is determined, the strength of the abrasive dust adsorption capacity of an iron core is adjusted, and the separation monitoring of the abrasive dust can be realized; 3) the position of the abrasive dust adsorption device is provided with an abrasive dust storage groove, so that adsorbed abrasive dust can be prevented from being brought between the gear teeth again due to the circulation impact of oil liquid, and the abrasion of the gear teeth is further aggravated; 4) the abrasive dust adsorption device is connected with the arm support rotating mechanism body through threads, can be easily disassembled and assembled, and removes abrasive dust from the hydraulic cavity, so that further aggravation of abrasion is prevented; 5) threaded connection and plug-in assembly mode make the wearing and tearing adsorption equipment structure compacter, and the volume is littleer, and it is more convenient to install.

Correspondingly, the embodiment of the invention also provides a detection device for detecting the abrasive dust in the oil.

Fig. 9 is a block diagram of a detecting apparatus for detecting abrasive dust in oil according to another embodiment of the present invention. As shown in fig. 9, the detection device includes a real-time current acquisition module 5 and a wear debris determination module 6. The real-time current acquisition module 5 is used for acquiring real-time current of the monitoring circuit, wherein the monitoring circuit is connected with an abrasive dust adsorption module, the abrasive dust adsorption module is used for adsorbing abrasive dust existing in oil, and the real-time current changes when the abrasive dust adsorption module adsorbs the abrasive dust; the abrasive dust judging module 6 is used for judging whether the real-time current changes; and judging whether the oil liquid contains abrasive dust or not according to the judgment result.

Optionally, in an embodiment of the present invention, the abrasive dust adsorption module is configured to generate a first magnetic field under the action of a second magnetic field, and the abrasive dust adsorption module adsorbs abrasive dust present in the oil flowing through the first magnetic field by the first magnetic field.

Optionally, in an embodiment of the present invention, the second magnetic field is generated by a second magnetic field generating module for generating the second magnetic field under an energizing action.

The specific working principle and the benefits of the detection device for detecting the abrasive dust in the oil provided by the embodiment of the invention are similar to those of the detection method for detecting the abrasive dust in the oil provided by the embodiment of the invention, and the detailed description is omitted here.

Accordingly, another aspect of the embodiments of the present invention further provides a determination apparatus for determining a health condition of a mechanical device. The determination device includes: the detection device described in the above embodiment; 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 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 monitoring circuit includes a small abrasive dust monitoring circuit and a large abrasive dust monitoring circuit, a size of abrasive dust adsorbed by an abrasive dust adsorption module in the small abrasive dust monitoring circuit is smaller than a first preset value, a size of abrasive dust adsorbed by an abrasive dust adsorption circuit in the large abrasive dust monitoring circuit is greater than or equal to the first preset value, and the health determination module determines, according to the amount of the abrasive dust, a wear state of a component generating the abrasive dust in the mechanical equipment and/or an operating state of the mechanical equipment, and includes at least one of: under the condition that only the real-time current of the small abrasive dust monitoring circuit changes, if the quantity of the abrasive dust does not reach a second preset value, the component is judged to be in a normal wear state and/or the mechanical equipment is judged to be in a normal working state; and/or if the quantity of the abrasive dust reaches a second preset value, judging that the part is in a fatigue wear state and/or the mechanical equipment is in a normal working state; and under the condition that the real-time current of the large abrasive dust monitoring circuit changes, judging that the part is in a severe abrasion state/a severe cutting abrasion state and/or the mechanical equipment is in an abnormal operation state.

Alternatively, in the embodiment of the present invention, the amount of the abrasive dusts is determined based on the number of times the real-time current is changed.

The specific working principle and the benefits of the determination apparatus for determining the health condition of the mechanical device provided by the embodiment of the present invention are similar to those of the determination method for determining the health condition of the mechanical device provided by the embodiment of the present invention, and will not be described again here.

In addition, another aspect of the embodiments of the present invention further provides a construction machine, where the construction machine includes the detection device and/or 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.