CN211951054U - Hydraulic system and excavator - Google Patents
Hydraulic system and excavator Download PDFInfo
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- CN211951054U CN211951054U CN202020598365.XU CN202020598365U CN211951054U CN 211951054 U CN211951054 U CN 211951054U CN 202020598365 U CN202020598365 U CN 202020598365U CN 211951054 U CN211951054 U CN 211951054U
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Abstract
The utility model provides a hydraulic system and excavator relates to hydraulic pressure technical field, include: the oil storage device, the detection device and the filtering device are connected with each other; the detection device is connected with the oil storage device and is used for detecting the cleanliness of oil in the oil storage device; the filtering device is communicated with the oil storage device through the oil outlet path and the oil return path respectively to form a circulating oil path for filtering oil in the oil storage device. Under the condition that carries out real-time detection through detection device to the cleanliness of the fluid in the oil storage device, through operating personnel's the control or filter equipment's autonomic judgement under, the completion carries out the purpose of clean filtration to the fluid that does not reach standard, clean from whole hydraulic system's source (oil storage device) promptly, the maintenance that has avoided current hydraulic equipment to adopt the mode of fixed period maintenance to appear is out of place and leads to the easy trouble of equipment or excessive maintenance leads to the higher condition of maintenance cost, the maintenance time of equipment has effectively been shortened, the operating efficiency of equipment has been improved.
Description
Technical Field
The utility model relates to a hydraulic pressure technical field particularly, relates to a hydraulic system and excavator.
Background
The hydraulic system can reduce the size of components to a certain extent, and realize relatively accurate control, so that the hydraulic system is widely applied to large-scale machinery. The hydraulic excavator is used in a construction site as one of the hydraulic excavators, and the hydraulic excavator is easy to cause faults due to pollution of oil in a hydraulic system because the construction working condition is complex and changeable and the common operation environment is severe.
The whole hydraulic system of the existing hydraulic excavator cleans oil liquid by means of an oil absorption filter and an oil return filter in a hydraulic oil tank, and in order to guarantee normal operation of the hydraulic excavator, the faults of the excavator are reduced by adopting a periodic maintenance mode, but under the influence of actual working conditions, the cleanliness of the oil liquid in a maintenance period is often beyond the standard or is maintained excessively, so that the operation efficiency of the hydraulic excavator is lower.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulic system and excavator to the not enough among the above-mentioned prior art to solve current hydraulic equipment and lead to the lower problem of its operating efficiency because of the maintenance is not in place or excessive maintenance.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
an aspect of the embodiment of the utility model provides a hydraulic system, include: the oil storage device, the detection device and the filtering device are connected with each other; the detection device is connected with the oil storage device and is used for detecting the cleanliness of oil in the oil storage device; the filtering device is communicated with the oil storage device through the oil outlet path and the oil return path respectively to form a circulating oil path for filtering oil in the oil storage device.
Optionally, the filtering device comprises a processing module and a filtering module electrically connected to each other; the filtering module is communicated with the oil storage device through the oil outlet path and the oil return path respectively, and the processing module is electrically connected with the detection device and used for generating cleaning parameters according to cleanliness to control the filtering module to filter oil in the oil storage device.
Optionally, the filtering module comprises an oil pump and a main filtering device which are respectively communicated with the circulating oil path; the oil pump is further connected with the oil storage device through an oil outlet path, the main filtering device is further connected with the oil storage device through an oil return path, and the processing module is electrically connected with the oil pump to control oil in the oil pump driving oil storage device to return to the oil storage device after passing through the main filtering device.
Optionally, the filter equipment is still strained the device including the assistance that sets up in the oil storage device, and the assistance is strained the device and is strained the device with main and be connected through an oil route for carry out prefiltration to oil pump driven fluid.
Optionally, the filtering device further comprises a display module electrically connected to the processing module for displaying the cleaning parameters.
In another aspect, the present invention provides an excavator, including any one of the above hydraulic systems.
The beneficial effects of the utility model include:
the utility model provides a hydraulic system, include: the oil storage device, the detection device and the filtering device are connected with each other; wherein, detection device is connected with the oil storage device to make detection device carry out real-time detection to fluid among the oil storage device, and obtain the cleanliness. The filtering device is communicated with the oil storage device through the oil outlet path and the oil return path respectively so as to form a circulating oil path from the oil storage device to the filtering device and then to the oil storage device, and the filtering function of oil in the oil storage device is completed in a circulating filtering mode, so that the cleaning of the oil which does not reach the standard in the whole operation system can be completed under the condition that the original oil storage device is supplied with hydraulic oil in normal operation as far as possible. Under the condition that carries out real-time detection through detection device to the cleanliness of the fluid in the oil storage device, through operating personnel's the control or filter equipment's autonomic judgement under, the completion carries out the purpose of clean filtration to the fluid that does not reach standard, clean from whole hydraulic system's source (oil storage device) promptly, the maintenance that has avoided current hydraulic equipment to adopt the mode of fixed period maintenance to appear is out of place and leads to the easy trouble of equipment or excessive maintenance leads to the higher condition of maintenance cost, the maintenance time of equipment has effectively been shortened, the operating efficiency of equipment has been improved.
The utility model provides an excavator again, on being applied to the excavator with foretell hydraulic system, realize carrying out real-time detection and cleanness to the oil storage device who is in the camera bellows position in the excavator, improve its life and operating efficiency, reduce unnecessary trouble repair time or the time that excessive maintenance consumes.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a hydraulic system according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a hydraulic system according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a hydraulic system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a control method of a hydraulic system according to an embodiment of the present invention.
Icon: 100-an oil storage device; 200-a detection device; 301-an oil pump; 302-a primary filtration device; 303-a processing module; 304-a display module; 305-an auxiliary filtration device; 400-an engine; 401-hydraulic pump; 402-multiple-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. It should be noted that, in the case of no conflict, various features in the embodiments of the present invention may be combined with each other, and the combined embodiments are still within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the field of equipment control, more and more equipment with a hydraulic system as a control system is carried, and the main reason is that the equipment volume can be effectively reduced by adopting hydraulic control, and meanwhile, more accurate control is realized. Compared with air pressure control, the air pressure control device has the advantages of lower requirements on the sealing performance and the working environment of the whole device, lower manufacturing cost and wider use scenes. For example, in construction, hydraulic devices are commonly used such as excavators, cranes, and loaders.
Usually, based on the rationality of equipment structure arrangement, the simple and convenient and safe demand of protection that hydraulic system set up, supply source oil storage device as whole hydraulic equipment fluid generally adopts the camera bellows setting, and because the environmental operating mode of construction operation is complicated changeable, leads to the clean management and control of hydraulic equipment's fluid to be difficult to reach the requirement. The hydraulic oil is possibly polluted at any time but is difficult to monitor in real time, so that when the hydraulic oil is maintained according to the conventional fixed period mode, the period is short, the time spent on maintenance and updating is long, meanwhile, the maintenance cost is high, and the waste of parts is caused; when the period is long, although the maintenance time and cost can be saved, the pollution degree of the hydraulic oil is serious, the whole hydraulic equipment is broken down, and the construction progress is influenced. The present application may solve the above problems by the following systems and methods, which are specifically as follows:
an aspect of the embodiment of the utility model provides a hydraulic system, include: the oil storage device 100, the detection device 200 and the filtering device are connected with each other; the detection device 200 is connected with the oil storage device 100 and is used for detecting the cleanliness of oil in the oil storage device 100; the filtering device is communicated with the oil storage device 100 through an oil outlet path and an oil return path respectively to form a circulating oil path for filtering oil in the oil storage device 100.
Illustratively, as shown in fig. 1, a hydraulic system is provided, which comprises an oil storage device 100, a detection device 200 and a filtering device. The oil storage device 100 is a source responsible for pressure oil supply in hydraulic equipment, and is generally a box structure, and a plurality of joints are arranged on a box body of the oil storage device for connecting with an external hydraulic oil pipeline to realize functions of operation, oil return and the like. The detection device 200 is connected to the oil storage device 100, thereby detecting the cleanliness of the hydraulic oil (oil liquid) contained therein. The connection relationship between the detection device 200 and the oil storage device 100 may be that an oil sensor is disposed in the oil storage device 100 to sample oil, and a controller in the detection device 200 completes analysis of the sampled oil (or directly performs analysis through a processing module 303 in the filtering device), so as to obtain information related to cleanliness, for example: oil contamination level, abrasive particle classification, ferromagnetic particle concentration, and the like. The filtering device filters and cleans the oil in the oil storage device 100 through the cleanliness information detected by the detecting device 200, so that the cleanliness of the oil meets an expected target value. In order to clean the oil in the whole hydraulic system under the condition of having little influence on the normal operation of the hydraulic equipment as far as possible, the filtering device and the oil storage device 100 can form complete circular connection, namely the filtering device is respectively communicated with the oil storage device 100 through an oil outlet path and an oil return path so as to form a circulating oil path from the oil storage device 100 to the filtering device and then to the oil storage device 100, the filtering function of the oil in the oil storage device 100 is completed through a circular filtering mode, and the storage amount of the hydraulic oil in the oil storage device 100 can be always maintained in a reasonable range capable of normally operating. The condition that the maintenance of the existing hydraulic equipment is easy to break down or the maintenance cost is high due to excessive maintenance caused by the fact that the existing hydraulic equipment is not maintained in place in a fixed period maintenance mode is avoided, the maintenance time of the equipment is effectively shortened, and the operation efficiency of the equipment is improved.
It should be noted that, first, the electricity utilization parts of the detection device 200 and the filtering device can be connected to the self-contained battery of the equipment, so as to realize higher integration level.
Secondly, in order to make the cleaning effect of the oil in the oil storage device 100 better as much as possible, the distance between the interface of the oil outlet path connecting the oil storage device 100 and the filtering device and the interface of the oil return path can be further set.
Optionally, the filtering device comprises a processing module 303 and a filtering module electrically connected to each other; the filtering module is respectively communicated with the oil storage device 100 through an oil outlet path and an oil return path, and the processing module 303 is electrically connected with the detection device 200 and is used for generating cleaning parameters according to cleanliness to control the filtering module to filter oil in the oil storage device 100.
Illustratively, as shown in fig. 2, the filtering device may further include a processing module 303 and a filtering module electrically connected to each other. The connection of the circulating oil path is realized by communicating one end of the filter module with the oil storage device 100 through the oil outlet path and communicating the other end with the other position of the oil storage device 100 through the oil return path. The processing module 303 is electrically connected to the detection device 200 and the filtering module, respectively, and is used as a control center, that is, the cleaning parameters are generated by acquiring the cleanliness information of the oil in the oil storage device 100 detected by the detection device 200, so as to control the filtering module to complete the function of filtering the oil in the oil storage device 100 when the conditions are met. Automatic cleaning control is realized through the processing module 303, and the intelligent level of the hydraulic equipment is further improved.
Optionally, the filtering module includes an oil pump 301 and a main filtering device 302 respectively communicated with the circulating oil path; the oil pump 301 is further connected with the oil storage device 100 through an oil outlet path, the main filter device 302 is further connected with the oil storage device 100 through an oil return path, and the processing module 303 is electrically connected with the oil pump 301 to control the oil pump 301 to drive oil in the oil storage device 100 to return to the oil storage device 100 after passing through the main filter device 302.
Illustratively, the filter module includes an oil pump 301 and a main filter device 302. Wherein, oil pump 301 and main filter device 302 all set up on the circulating oil way. The oil pump 301 is communicated with the oil storage device 100 through an oil outlet path, the oil pump 301 may be communicated with the main filter device 302 through an oil outlet path or an oil return path (for example, in fig. 1, the oil pump 301 is communicated with the main filter device 302 through the oil outlet path and the oil return path whose end portions are communicated with each other), and the main filter device 302 is communicated with another position of the oil storage device 100 (referring to any position on the oil storage device 100 except a position connected with the oil storage device 100 and the oil outlet path) through the oil return path. The processing module 303 is connected to the oil pump 301, i.e. the oil pump 301 is an electronic oil pump 301. The processing module 303 determines and controls whether the electronic oil pump 301 is started or not according to the cleanliness information detected by the detection device 200, and drives the oil in the oil storage device 100 to return to the oil storage device 100 through the electronic oil pump 301, the main filter device 302 and the oil return path in sequence through the oil outlet path after the electronic oil pump 301 is started. After the electronic oil pump 301 is started, the oil in the oil storage device 100 may be driven to return to the oil storage device 100 through the main filter device 302, the electronic oil pump 301, and the oil outlet passage in sequence.
It should be noted that, first, the electronic oil pump 301 may include a motor portion and an oil pump 301 portion, and the two portions may be driven by a gear or may be driven coaxially. Secondly, the main filter device 302 is a device with a filtering function, and may be a device with a filtering function, and may further be provided with a magnetic filter box or the like. The filtration accuracy may be 10 microns, 15 microns, 20 microns, etc.
Optionally, the filtering apparatus further includes an auxiliary filtering apparatus 305 disposed in the oil storage apparatus 100, and the auxiliary filtering apparatus 305 is connected to the main filtering apparatus 302 through an oil outlet path, and is configured to pre-filter oil driven by the oil pump 301.
For example, as shown in fig. 2, in order to further improve the filtering effect, a two-stage filtering may be adopted, that is, an auxiliary filtering device 305 is disposed in the oil storage device 100, wherein the auxiliary filtering device 305 should be disposed at the end of the oil outlet path, so that when the oil pump 301 starts to work to drive the hydraulic oil in the oil storage device 100 into the oil outlet path, the hydraulic oil is pre-filtered by the auxiliary filtering device 305. The structure of the auxiliary filter device 305 can refer to the main filter device 302, and the filter precision of the auxiliary filter device is higher than that of the main filter device 302, so that the oil pump 301 is prevented from being damaged due to larger flow resistance when being driven.
Optionally, the filtering apparatus further comprises a display module 304 electrically connected to the processing module 303 for displaying the cleaning parameters.
For example, as shown in fig. 2, in order to further facilitate observation and control of an operator, a display module 304 may be further provided, and the display module is electrically connected to the processing module 303 to achieve real-time display of data, where the data may be cleanliness of oil in the oil storage device 100, whether the oil pump 301 is running, a rotation speed, and a blockage rate of the main filter device 302, and a flow rate sensor may be further provided in the circulating oil path to obtain data of a speed, a pressure, and the like of the oil in the circulating oil path and display the data on the display module 304. Thereby further improving the operator's understanding of the hydraulic equipment.
On the other hand, the embodiment of the present invention provides a control method for a hydraulic system, which is used for controlling any one of the above hydraulic systems; the hydraulic system comprises an oil storage device 100, a detection device 200 and a filtering device; the method comprises the following steps:
acquiring the cleanliness of the oil liquid detection in the oil storage device 100 by the detection device 200;
judging whether the cleanliness is greater than or equal to a preset value and generating a judgment result, and if so, filtering oil in the oil storage device 100; if the judgment result is no, the oil liquid in the oil storage device 100 is stopped filtering.
Illustratively, based on the foregoing hydraulic system, as shown in fig. 4, the present embodiment provides a control method of the hydraulic system, as follows:
step S10: the cleanliness of the oil liquid detected by the detection device 200 in the oil storage device 100 is acquired.
The cleanliness of the oil in the oil storage device 100 is detected in real time by the filter device control detection device 200, so that the cleanliness of the oil in the oil storage device 100 can be obtained.
Step S20: judging whether the cleanliness is greater than or equal to a preset value and generating a judgment result, and if so, filtering oil in the oil storage device 100; if the judgment result is no, the oil liquid in the oil storage device 100 is stopped filtering.
The filtering device compares the cleanliness information with a preset value to judge whether the cleanliness is greater than or equal to the preset value, so that a judgment result is generated. If the judgment result is yes, the oil in the oil storage device 100 is filtered. If the judgment result is no, the oil liquid in the oil storage device 100 is stopped filtering. The oil in the oil storage device 100 is cleaned and filtered according to the cleanliness information detected by the detection device 200 in an automatic judgment mode, the condition that the equipment is easy to break down or the maintenance cost is high due to excessive maintenance caused by the fact that the existing hydraulic equipment is not maintained in place in a fixed period maintenance mode is avoided, the maintenance time of the equipment is effectively shortened, and the operation efficiency of the equipment is improved.
Optionally, the filtering device comprises a processing module 303 and a filtering module electrically connected to each other; if the determination result is yes, the oil in the oil storage device 100 is filtered, including:
if the judgment result of the processing module 303 is yes, the cleaning parameter is generated, and the filtering module is controlled to filter the oil in the oil storage device 100 according to the cleaning parameter.
For example, when the filtering device includes the processing module 303 and the filtering module, the step S20 "if the determination result is yes, the oil in the oil storage device 100 is filtered", specifically, if the determination result is yes, a cleaning parameter is further generated according to information detected by the detecting device 200, such as a degree of pollution, an amount of oil remaining in the oil storage device 100, and the like, so as to implement more precise and intelligent control according to the cleaning parameter, thereby avoiding time and labor consumption of the filtering module during filtering, and simultaneously, monitoring the amount of oil remaining in the oil storage device 100 at any time, and preventing a phenomenon that the supply of hydraulic oil in the oil storage device 100 is insufficient when the hydraulic equipment normally operates. The safety of the equipment is further improved.
Optionally, the filtering module comprises an oil pump 301 and a main filtering device 302, and the cleaning parameters include: the rotation speed of the oil pump 301, the displacement of the oil pump 301, and the filtration accuracy of the main filter device 302.
Illustratively, the filtering module includes an oil pump 301 and a main filtering device 302, wherein the cleaning parameters may include: the rotation speed of the oil pump 301, the displacement of the oil pump 301, the filtering accuracy of the main filter device 302, and the like, so as to achieve more accurate and intelligent control.
Optionally, judging whether the cleanliness is greater than or equal to a preset value and generating a judgment result, and if so, filtering oil in the oil storage device 100; if the judgment result is no, the oil liquid in the oil storage device 100 is stopped filtering, which includes:
judging whether the cleanliness is greater than or equal to a preset value and generating a judgment result, and filtering oil in the oil storage device 100 if the judgment result is yes and the duration is greater than or equal to a first preset time; if the judgment result is negative and the duration time is greater than or equal to the second preset time, the oil liquid in the oil storage device 100 is stopped being filtered.
For example, in step S20, the method may further include that when the determination result is yes, and the determination result "cleanliness is greater than or equal to the preset value" needs to last for a certain time, and the filtering device starts to filter the oil in the oil storage device 100 after the time duration is greater than or equal to the first preset time. Similarly, when the determination result is negative, and the determination result "cleanliness is less than the preset value" needs to last for a certain time, and the duration time is greater than or equal to a second preset time, the filtering device stops filtering the oil in the oil storage device 100. By continuing the judgment result for a certain time and then selecting whether to filter and clean, the error action of the filtering device caused by the deviation of the sampling detection of the detection device 200 can be effectively avoided.
In another aspect, the present invention provides an excavator, including any one of the above hydraulic systems.
As an example, as shown in fig. 3, the hydraulic system described above is applied to an excavator. The excavator includes an engine 400, a hydraulic pump 401, a multiplex valve 402, an actuator, and an oil storage device 100. The hydraulic pump 401 is communicated with the oil storage device 100, the hydraulic pump 401 is driven by the engine 400 to output the rotating speed, when the hydraulic pump 401 operates, oil in the oil storage device 100 can be supplied to the actuating element through the hydraulic pump 401 to the multi-way valve 402 so as to drive the actuating element to operate, and when pressure is relieved, the oil is supplied to the oil storage device 100 from the actuating element to the multi-way valve 402. Meanwhile, the detection device 200 and the filtering device in the hydraulic system are connected with the oil storage device 100, so that the oil storage device 100 at the position of a camera bellows in the excavator can be detected and cleaned in real time, the service life and the operation efficiency are improved, and unnecessary fault maintenance time or time consumed by excessive maintenance is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A hydraulic system, comprising: the oil storage device, the detection device and the filtering device are connected with each other;
the detection device is connected with the oil storage device and is used for detecting the cleanliness of oil in the oil storage device;
the filtering device is communicated with the oil storage device through an oil outlet path and an oil return path respectively to form a circulating oil path for filtering oil in the oil storage device.
2. The hydraulic system of claim 1, wherein the filter arrangement includes a processing module and a filter module electrically connected to each other; the filtering module is communicated with the oil storage device through an oil outlet path and an oil return path respectively, and the processing module is electrically connected with the detection device and used for generating cleaning parameters according to the cleanliness to control the filtering module to filter oil in the oil storage device.
3. The hydraulic system according to claim 2, wherein the filter module includes an oil pump and a main filter device which are respectively communicated with each other and provided on the circulation oil path; the oil pump still with the oil storage device passes through out the oil road and connects, the main device of straining still with the oil storage device passes through back the oil road and connects, processing module with the oil pump electricity is connected, in order to control the oil pump drive fluid in the oil storage device passes through mainly strain the device back and return the oil storage device.
4. The hydraulic system as claimed in claim 3, wherein the filtering means further comprises an auxiliary filtering means disposed in the oil storage means, the auxiliary filtering means being connected to the main filtering means through an oil outlet passage for pre-filtering the oil driven by the oil pump.
5. The hydraulic system of claim 2, wherein the filter device further comprises a display module electrically connected to the processing module for displaying the cleaning parameter.
6. Excavator, characterized in that it comprises a hydraulic system according to any of claims 1 to 5.
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| CN202020598365.XU CN211951054U (en) | 2020-04-21 | 2020-04-21 | Hydraulic system and excavator |
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| CN202020598365.XU CN211951054U (en) | 2020-04-21 | 2020-04-21 | Hydraulic system and excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790195A (en) * | 2021-08-24 | 2021-12-14 | 中联重科股份有限公司 | Method and device for determining hydraulic oil maintenance information of mechanical equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790195A (en) * | 2021-08-24 | 2021-12-14 | 中联重科股份有限公司 | Method and device for determining hydraulic oil maintenance information of mechanical equipment |
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