CN111075794A - Method and device for monitoring leakage of hydraulic system - Google Patents
Method and device for monitoring leakage of hydraulic system Download PDFInfo
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- CN111075794A CN111075794A CN202010025793.8A CN202010025793A CN111075794A CN 111075794 A CN111075794 A CN 111075794A CN 202010025793 A CN202010025793 A CN 202010025793A CN 111075794 A CN111075794 A CN 111075794A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/36—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested
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Abstract
The invention discloses a method for monitoring leakage of a hydraulic system, which comprises the steps of obtaining an initial oil liquid height HL0 in an oil tank and an actual oil liquid height HL in the oil tank when the hydraulic system operates; and obtaining the stroke D of the oil cylinder and the height change quantity delta H of the oil in the oil tank. According to the method for monitoring the leakage of the hydraulic system, the change of the liquid level of the oil in the oil tank is linked with the displacement change of the piston in the oil cylinder by using a specific formula, the height of the oil in the oil tank during the operation of the hydraulic system is calculated by obtaining the stroke of the oil cylinder and the formula, the calculated height of the oil is compared with the actual height of the oil in the oil tank, and whether the oil leakage occurs in the hydraulic system is monitored by the comparison result, so that the effective and reliable real-time monitoring can be carried out on the hydraulic system, the problem of the oil leakage is avoided, and the stable and reliable operation of the hydraulic system is ensured. The invention also discloses a device for monitoring the leakage of the hydraulic system.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a method and a device for monitoring leakage of a hydraulic system.
Background
For a hydraulic system, especially a large-scale hydraulic system, if the hydraulic pump is not stopped in time due to a broken pipeline, large-area and large-scale hydraulic oil can be leaked outside, environmental pollution and subsequent work such as subsequent cleaning treatment and hydraulic oil refilling can be caused, and a relatively long-time shutdown accident can also be caused.
Although a bottom oil level switch is arranged in a fuel tank of a conventional hydraulic system, when a large amount of oil leaks outwards due to burst of the system, particularly an oil outlet hose of an oil pump, the operation of the oil pump is stopped only after the bottom oil level switch is operated, and a large amount of hydraulic oil is lost.
Disclosure of Invention
The invention aims to solve the problem that oil leakage in a hydraulic system cannot be monitored in time in the prior art.
In order to solve the technical problem, the embodiment of the invention discloses a method for monitoring leakage of a hydraulic system, which comprises the following steps:
acquiring an initial oil liquid height HL0 in the oil tank and an actual oil liquid height HL in the oil tank when a hydraulic system operates;
acquiring a stroke D of the oil cylinder and a height variation delta H of oil in the oil tank, and calculating a proportional factor α between the stroke D and the height variation delta H of the oil in the oil tank according to a formula of delta H- α -star D;
calculating the height HLC (HL 0-delta H) of oil in the oil tank to HL0- α (D);
an alarm value S is arranged in the hydraulic system, and when the absolute value HL-HLC is larger than S, the hydraulic system gives an alarm.
By adopting the technical scheme, the change of the liquid level of the oil in the oil tank is linked with the displacement change of the piston in the oil tank by using a specific formula, the height of the oil in the oil tank during the operation of the hydraulic system is calculated by acquiring the stroke and the formula of the oil tank, the calculated height of the oil is compared with the actual height of the oil in the oil tank, and whether the oil leaks from the hydraulic system is monitored by comparing the calculated height of the oil with the actual height of the oil in the oil tank, so that the hydraulic system can be effectively and reliably monitored in real time, the problem of oil leakage is avoided, and the stable and reliable operation.
Optionally, the alarm values S include a first alarm value S1 and a second alarm value S2, when HL-HLC > S1, the hydraulic system alarms due to a liquid level fault, and when HL-HLC > S2, all oil pumps in the hydraulic system are stopped and the hydraulic system is reset.
Optionally, in the hydraulic system, displacement sensors are provided on the cylinders, and are used for acquiring the stroke D.
Optionally, the hydraulic system has N types of cylinders, the scale factor of the ith type of cylinder is α i, and the stroke is Di, then
N, i is a positive integer.
Optionally, N is 3.
Optionally, when the scale factor α i of the ith type of cylinder is collected, the strokes of the other N-1 type of cylinders are all 0.
The embodiment of the invention also discloses a device for monitoring the leakage of the hydraulic system, which is characterized by comprising the following components: the information acquisition module is used for acquiring oil height information in the oil tank and the stroke D of the oil cylinder; the information processing module is used for calculating and processing the information acquired by the information acquisition module; and the alarm module is used for giving an alarm according to the calculation and processing results of the information processing module.
Optionally, the information acquisition module includes a liquid level sensor and a displacement sensor, the liquid level sensor is disposed in the oil tank and used for acquiring height information of oil in the oil tank, and the displacement sensor is disposed on the oil cylinder and used for acquiring a stroke D of the oil cylinder.
Optionally, the liquid level sensor is a linear liquid level sensor, the output signal range is 4-20mA, and the height stroke of the measured oil is 80-1200 mm.
Optionally, the liquid level sensor is provided with an ultra-low oil level alarm value and an ultra-high oil level alarm value.
Drawings
FIG. 1 is a flow chart of a method for monitoring a hydraulic system for leakage in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a hydraulic system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", "left", "right", "inner", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable 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 meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a method for monitoring leakage of a hydraulic system according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram illustrating the hydraulic system according to the embodiment of the present invention, and referring to fig. 1-2, in the hydraulic system 1, the total volume of oil is constant, that is, the total volume of the oil in the oil tank 10, the oil in the oil cylinder 13, and the oil in the pipeline 100 is constant. When the hydraulic system 1 operates, because the sectional area of the oil tank 10 is unchanged, the sectional area of the oil cylinder 13 is unchanged, and the volume of the pipeline 100 is unchanged, if the displacement of the piston 130 in the oil cylinder 13 is changed, the corresponding liquid level in the oil tank 10 is also changed, namely, the movement speed of the piston 130 in the oil cylinder 13 has a certain proportional relation with the liquid level change speed of the oil tank 10, the occurrence of an accidental oil injection accident can be prevented by monitoring the proportional relation, namely, if the hydraulic system 1 detects that the error of the proportional relation is larger than a certain amount, the oil quantity loss can be judged, the operation of the oil pump needs to be stopped, and therefore, the leakage and the loss of the oil quantity are reduced to the maximum extent.
Specifically, referring to fig. 1-2, in the present embodiment, if the piston 130 in the cylinder 13 retracts, the liquid level in the tank 10 will rise, and the rate of rise of the liquid level will be related to the size of the cylinder 13 and the size of the tank 10; if the piston 130 extends outward in the cylinder 13, the liquid level in the tank 10 will decrease, and the amount of the decrease in the liquid level is proportional to the amount of change in the outward extension of the piston 130 in the cylinder 13.
1-2, based on the above analysis, an embodiment of the present invention provides a method for monitoring hydraulic system leakage, comprising the steps of:
s1: acquiring an initial oil liquid height HL0 in the oil tank 10 and an actual oil liquid height HL in the oil tank 10 when the hydraulic system 1 operates;
s2, acquiring a stroke D of the oil cylinder 13 and a height change quantity delta H of oil in the oil tank 10, and calculating a scale factor α between the stroke D and the height change quantity delta H of the oil in the oil tank 10 according to a formula that the delta H is α X D;
s3, calculating the height HLC (becoming HL 0-Delta H) HL0- α (becoming D) of oil in the oil tank 10;
s4: an alarm value S is arranged in the hydraulic system 1, and when the absolute value HL-HLC is larger than S, the hydraulic system 1 gives an alarm.
That is, in step S1, the variation of the liquid level of the oil in the oil tank 10 can be accurately obtained in real time by obtaining the initial oil level HL0 in the oil tank 10 when the hydraulic system 1 is running and the actual oil level HL in the oil tank 10, where the initial oil level HL0 in the oil tank 10 refers to the height of the oil in the oil tank 10 when each component in the hydraulic system 1 has completely exhausted air and filled with oil and the oil cylinder 13 is in a completely contracted state, that is, the variation of the liquid level of the oil in the oil tank 10 is only related to the displacement variation of the piston 130 in the oil cylinder 13, so that the variation between the two has a corresponding proportional relationship.
In step S2, two processes S20 and S21 are included, in which the process S20 is to obtain the stroke D of the cylinder 13 and the variation Δ H of the height of the oil in the oil tank 10, and the process S21 is to calculate the scaling factor α between the stroke D and the variation Δ H of the height of the oil in the oil tank 10 according to the formula Δ H α × D.
Referring to fig. 1-2, in the present embodiment, the cylinder 13 is provided with a displacement sensor 111 for acquiring a stroke D of the cylinder 13. That is, the stroke D of the piston 130 in the cylinder 13 is monitored in real time by providing the displacement sensor 111 on the cylinder 13. Specifically, the displacement sensor 111 may be a magnetostrictive displacement sensor, which can directly obtain the stroke D of the piston 130 in the oil cylinder 13, or a mechanical position or angle sensor, which can measure and convert the running angle value of the oil cylinder 13 to indirectly obtain the stroke D of the piston 130 in the oil cylinder 13. In other embodiments, the displacement sensor can be in other structures and types, the invention is not limited to the above, and reasonable selection and arrangement can be carried out according to actual needs as long as the stroke of the oil cylinder can be accurately and reliably monitored in real time.
In addition, if the hydraulic system 1 includes a hydraulic motor in addition to the cylinder 13 as an actuator, the level of the oil in the oil tank 10 will not be changed because the hydraulic motor operates without a volume difference, and therefore, the method for monitoring the leakage of the hydraulic system provided by the present invention is also applicable to the hydraulic system 1 including the hydraulic motor.
Referring to fig. 1-2, in the present embodiment, a liquid level sensor 110 is installed in the oil tank 10, and is used for acquiring height information of oil in the oil tank 10, that is, the liquid level sensor 110 can acquire actual height information of oil in the oil tank 10 in real time, and continuously monitor the height of oil in the oil tank 10 in real time, so as to prevent the hydraulic system 1 from injecting oil to the outside. Specifically, in this embodiment, the liquid level sensor 110 is a linear liquid level sensor, the output signal range is 4 to 20mA, and the height stroke of the measured oil is 80 to 1200 mm. As can be seen from this, each time the signal of the level sensor 110 changes by 1mA, the height of the oil in the oil tank 10 changes by (1200-80)/(20-4) mm to 70mm, that is, when the output signal of the level sensor 110 is I mA, the corresponding change Δ H of the height of the oil in the oil tank 10 is 70 (I-4) +80 to 70I-200.
In the embodiment, the initial height HL0 of the oil in the oil tank 10 is 950mm, when the output signal of the liquid level sensor 110 is 10mA, the variation Δ H of the height of the oil in the oil tank 10 is 70 × 10-4) +80 is 500mm, and the actual height HL0- Δ H of the oil in the oil tank 10 is 950mm-500mm, which is 450 mm; when the output signal of the liquid level sensor 110 is 5mA, the variation Δ H of the oil height is 70 × (5-4) +80 ═ 150mm, and the actual oil height HL in the oil tank 10 is HL0- Δ H, 950mm-150mm, 800 mm. Therefore, the actual height information of the oil in the oil tank 10 can be monitored in real time through the liquid level sensor 110 and displayed in the display module 16 of the hydraulic system 1, so that an operator can conveniently connect the actual height information of the oil in the oil tank 10 and the residual oil amount in real time. In order to avoid too little or too much oil in the oil tank 10, the liquid level sensor 110 is provided with an ultra-low oil level alarm value and an ultra-high oil level alarm value, and the liquid level sensor 110 can give an alarm when the oil is lower than the ultra-low oil level alarm value or higher than the ultra-high oil level alarm value, so as to remind an operator of carrying out corresponding processing, thereby ensuring that the hydraulic system 1 can work stably and effectively.
In other embodiments, the liquid level sensor may have other structures and types, which are not limited in the present invention, and may be reasonably selected and set according to actual needs, as long as it is ensured that the liquid level sensor can accurately and reliably measure the variation of the height of the oil in the oil tank or the actual height information of the oil in the oil tank.
It should be noted that, the general principle of the method for monitoring the leakage of the hydraulic system provided by the present invention is that the total oil amount of the hydraulic system is not changed, and for an irregular oil tank with unequal cross sections and functional relationship between the cross sections, only a corresponding functional relationship needs to be established between the oil level and the oil variation in the oil tank; for the oil tanks with unequal cross sections and the cross sections which cannot be expressed by functions, if the structure of the oil cylinder in the hydraulic system is simple and the type of the oil cylinder is single, the hydraulic system can continuously run the oil cylinder once in the whole process, the value of the liquid level height variation in the oil tank corresponding to the stroke or the position of the oil cylinder is obtained at each small time interval, the value is made into a data table form, and the data table is input into an information processing module of the hydraulic system.
After the stroke D of the oil cylinder 13 and the variation Δ H of the oil height in the oil tank 10 are obtained through the above process, the scaling factor α between the stroke D and the variation Δ H of the oil height in the oil tank 10 can be calculated only through the formula of α × D, and the scaling factor α is provided in the information processing module 12 of the hydraulic system 1, so that the information processing module 12 can calculate and process the information collected by the liquid level sensor 110 and the displacement sensor 111.
Specifically, in step S3, when the hydraulic system 1 is running, the information processing module 12 is capable of calculating the variation Δ H of the oil height in the oil tank 10 according to the pre-collected scale factor α and the stroke D of the oil cylinder 13 collected by the displacement sensor 111 and according to the formula Δ H- α, and calculating the oil height HLC in the oil tank 10 according to the formula HLC-HL 0- Δ H-HL 0- α, that is, the information processing module 12 of the hydraulic system 1 is capable of calculating the oil height HLC in the oil tank 10.
In step S4, the information processing module 12 compares the calculated oil level HLC in the tank 10 with the actual oil level HL in the tank 10. Specifically, in the present embodiment, the information processing module 12 compares HLC and HL by taking a difference, that is, obtains a value of | HL-HLC |. The hydraulic system 1 of the embodiment is provided with an alarm value S, and when | HL-HLC | > S, the hydraulic system 1 alarms.
Specifically, when HL-HLC > S, that is, the actual oil height HL in the oil tank 10 is greater than the oil height HLC in the oil tank 10 calculated by the information processing module 12, this indicates that the total oil amount in the hydraulic system 1 is increasing, and the worker is filling oil into the oil tank.
Specifically, when HLC-HL > S, that is, the oil height HLC in the oil tank 10 calculated by the information processing module 12 is greater than the actual oil height HL in the oil tank 10, which indicates that the total amount of oil in the hydraulic system 1 is reduced, and that the hydraulic system 1 has oil leakage faults, such as pipe burst, joint loosening, oil injection from the oil tank, and the like, and needs to be checked and maintained by a worker.
Further, in the embodiment, the alarm value S includes a first alarm value S1 and a second alarm value S2, when the | HL-HLC | > S1, the hydraulic system 1 alarms due to a liquid level fault, and when the | HL-HLC | > S2, all oil pumps in the hydraulic system 1 are stopped, and the hydraulic system 1 is reset.
That is, the severity of the fault in the hydraulic system 1 is determined and identified according to the calculated difference between the oil level HLC in the oil tank 10 and the actual oil level HL in the oil tank 10, and the alarm value S is divided into two levels according to the severity of the fault, that is, the alarm value S includes a first alarm value S1 and a second alarm value S2, where the first alarm value S1 corresponds to a smaller fault, and after the operator checks the equipment, if there is no substantial fault problem, the operator can continue the operation by resetting the hydraulic system, and the second alarm value S2 corresponds to a larger fault, and when the second alarm value S2 is reached, the hydraulic system 1 should be immediately stopped, the operator cannot continue the operation, and the operator needs to detect and maintain the equipment, remove the fault, and reset the hydraulic system 1.
It should be noted that, the specific values of the first alarm value S1 and the second alarm value S2 are not limited in the present invention, and may be set and selected reasonably according to the specific situation of the hydraulic system. Specifically, in the present embodiment, the first alarm value S1 is 10mm, and the second alarm value S2 is 20 mm. In other embodiments, the first alarm value S1 and the second alarm value S2 may be other values, which is not limited in the disclosure.
Further, in the present embodiment, the hydraulic system 1 has N types of cylinders 13, and if the scale factor of the i-th type cylinder 13 is α i and the stroke is Di, then the hydraulic system 1 has N types of cylinders 13
N, i is a positive integer.
That is, the hydraulic system 1 has a plurality of type cylinders 13, each type cylinder 13 has a corresponding scale factor α and a corresponding stroke D, before the hydraulic system 1 works, the hydraulic system 1 needs to be started to acquire the scale factor α and the stroke D of the cylinder 13, in order to avoid mutual interference of the different types of cylinders 13 during parameter acquisition, therefore, when the scale factor α i of the ith type cylinder 13 is acquired, the strokes of the other N-1 type cylinders 13 are all 0.
Specifically, in the present embodiment, N is 3, that is, the hydraulic system 1 of the present embodiment is provided with 3 types of cylinders 13, which are respectively an a-type cylinder, a B-type cylinder, and a C-type cylinder, and each cylinder 13 is provided with a displacement sensor 111 for acquiring a stroke D of each cylinder 13. In this embodiment, the a-type cylinder, the B-type cylinder, and the C-type cylinder represent three types of cylinders 13 with different specifications, that is, the a-type cylinder, the B-type cylinder, and the C-type cylinder have different cylinder diameters and rod diameters, the cylinders 13 with the same cylinder diameter and rod diameter but different strokes are classified into one type, and the parameters of the various types of cylinders 13 are detailed in the following table 1:
after the oil tank 10 in the hydraulic system 1 is filled with oil, the piston 130 of each cylinder 13 performs several times of full-stroke telescopic actions to exhaust air, so as to ensure that the pipeline 100 and the cylinders 13 are filled with oil. Then, the piston 130 of each cylinder 13 is retracted to the bottom, that is, the stroke D of each cylinder 13 is 0. After the pipeline 100 and the cylinder 13 are filled with oil, the level of the oil in the oil tank 10 is recorded as the initial oil height HL 0. And then, the scale factor acquisition is carried out according to the sequence of each type of oil cylinder 13.
In addition, in the hydraulic system 1, each type of cylinder may have multiple cylinders 13, and when the scale factor is acquired, the strokes of multiple cylinders 13 of the same type need to be summed to obtain the stroke sum of the cylinders 13 of the same type.
For example, when a class a cylinder is subjected to scale factor collection, other classes of cylinders do not operate, only the class a cylinder operates, the liquid level sensor 110 of the hydraulic system 1 records the initial height HL0 of oil in the oil tank 10 before the cylinder a operates, the displacement sensor 111 on the class a cylinder can transmit the stroke D1 of each class a cylinder to the information processing module 12, the information processing module 12 sums up to obtain the stroke sum Σ D1 of the class a cylinder, meanwhile, the liquid level sensor 110 records the actual oil height HLA in the oil tank 10 after the cylinder 13 operates, and transmits HL0 and HLA to the information processing module 12, and the information processing module 12 calculates the scale factor α 1 of the class a cylinder according to the formula Δ H α ═ D, that is, α ═ HL0-HLA)/Σ D1, and the unit of each parameter is mm.
In order to ensure the accuracy and reliability of the scale factor α 1, the scale factor can be acquired for a plurality of times for the type a cylinder, then the average value is obtained, that is, the type a cylinder is enabled to perform a plurality of actions, the scale factor α 1 is acquired once for each action, then the average value is obtained, and the accuracy and reliability of the scale factor α 1 are increased.
For the type B oil cylinder and the type C oil cylinder, the scale factors α 2 and α 3 can be acquired by referring to the acquisition process of the scale factor α 1 of the type a oil cylinder, which is not described herein again.
In addition, since the change of the oil liquid level in the oil tank 10 is only related to the displacement change of the piston 130 in the oil cylinder 13, if the diameter of the piston 130 in each type of oil cylinder 13 can be known, and after the proportional factors of a certain type of oil cylinder 13 are collected, the proportional factors of other types of oil cylinders 13 can be calculated according to the ratio of the diameters of the pistons 130 in the various types of oil cylinders 13.
After the proportional factors of the various cylinders are collected, the proportional factors of the various cylinders are stored in the information processing module 12, when the hydraulic system 1 performs normal operation, the information processing module 12 can receive the stroke D collected by the displacement sensor 111 on each cylinder 13 and the actual oil height HL collected by the liquid level sensor 110 in the oil tank 10 in real time, and can calculate the oil height HLC in the oil tank 10 when the hydraulic system 1 performs operation according to the formula HL0- Δ H0- α.
The embodiment of the invention also discloses a device for monitoring the leakage of the hydraulic system, which comprises: the information acquisition module 11 is used for acquiring oil height information in the oil tank 10 and the stroke D of the oil cylinder 13; the information processing module 12 is used for calculating and processing the information acquired by the information acquisition module 11; and the alarm module 15 is used for giving an alarm according to the calculation and processing result of the information processing module 12.
That is to say, the device mainly includes information acquisition module 11, information processing module 12 and alarm module 15, wherein, information acquisition module 11 is used for acquireing the travel D of interior fluid height information of oil tank 10 and hydro-cylinder 13, including level sensor 110 and displacement sensor 111, and level sensor 110 locates in oil tank 10 for acquireing the interior fluid height information of oil tank 10, and displacement sensor 111 locates on hydro-cylinder 13 for acquireing the travel D of hydro-cylinder 13. The information processing module 12 may be an upper computer, or may be an intelligent processor (such as an industrial personal computer, an intelligent chip, etc.), as long as the information processing requirement of the hydraulic system 1 can be met, which is not limited in the present invention, and may be appropriately selected according to actual needs. The alarm module 15 may be an alarm lamp or an alarm, which is not limited in the present invention, as long as the alarm can be performed as required.
In addition, a hydraulic control module 14 and a display module 16 are further disposed in the hydraulic system 1, wherein the hydraulic control module 14 is used for controlling the operation and flow of oil in hydraulic elements such as the pipeline 100, and the display module 16 is used for displaying various information in the hydraulic system 1.
Further, in the embodiment, the liquid level sensor 110 is a linear liquid level sensor, the output signal range is 4-20mA, and the height stroke of the measured oil is 80-1200 mm. The level sensor 110 is provided with an ultra-low oil level alarm value and an ultra-high oil level alarm value.
As described above, the method for monitoring leakage of a hydraulic system according to the present invention establishes a relationship between a change in a liquid level of oil in an oil tank and a change in a displacement of a piston in the oil cylinder by using a specific formula, calculates a height of the oil in the oil tank during operation of the hydraulic system by obtaining a stroke of the oil cylinder and the formula, compares the calculated height of the oil with an actual height of the oil in the oil tank, and monitors whether the hydraulic system has oil leakage or not according to a comparison result, thereby effectively and reliably monitoring the hydraulic system in real time, avoiding the problem of oil leakage, and ensuring stable and reliable operation of the hydraulic system.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A method for monitoring a hydraulic system for leaks, comprising the steps of:
acquiring an initial oil liquid height HL0 in the oil tank and an actual oil liquid height HL in the oil tank when a hydraulic system operates;
acquiring a stroke D of the oil cylinder and a height variation delta H of oil in the oil tank, and calculating a proportional factor α between the stroke D and the height variation delta H of the oil in the oil tank according to a formula of delta H- α -star D;
calculating the height HLC (HL 0-delta H) of oil in the oil tank to HL0- α (D);
an alarm value S is arranged in the hydraulic system, and when the absolute value HL-HLC is larger than S, the hydraulic system gives an alarm.
2. The method of monitoring a hydraulic system for leakage according to claim 1, wherein the alarm values S include a first alarm value S1 and a second alarm value S2, the hydraulic system alarms when HL-HLC > S1 has a liquid level fault, all oil pumps in the hydraulic system are stopped when HL-HLC > S2, and the hydraulic system is reset.
3. A method for monitoring leakage from a hydraulic system as claimed in claim 1, wherein displacement sensors are provided on the cylinders in the hydraulic system for sensing the stroke D.
4. A method for monitoring leakage from a hydraulic system as claimed in claim 1 or 3, wherein there are N types of cylinders in the hydraulic system, and the scaling factor for the i-th type of cylinder is α i, and the stroke is Di, then
The N, i is a positive integer.
5. The method for monitoring a hydraulic system for leakage according to claim 4, wherein N is 3.
6. The method for monitoring hydraulic system for leakage according to claim 4, wherein when the scaling factor α i for the ith type of cylinder is collected, the strokes of the other N-1 types of cylinders are all 0.
7. An apparatus for monitoring hydraulic system leakage, comprising:
the information acquisition module is used for acquiring oil height information in the oil tank and the stroke D of the oil cylinder;
the information processing module is used for calculating and processing the information acquired by the information acquisition module;
and the alarm module is used for giving an alarm according to the calculation and processing results of the information processing module.
8. The apparatus according to claim 7, wherein the information acquisition module comprises a liquid level sensor and a displacement sensor, the liquid level sensor is disposed in the oil tank for acquiring the oil level information in the oil tank, and the displacement sensor is disposed on the oil cylinder for acquiring the stroke D of the oil cylinder.
9. The apparatus for monitoring leakage from a hydraulic system of claim 8, wherein the level sensor is a linear level sensor, the output signal is in the range of 4-20mA, and the height stroke of the oil is measured in the range of 80-1200 mm.
10. The apparatus for monitoring hydraulic system for leaks according to claim 9, wherein the level sensor is provided with an ultra-low level alarm value and an ultra-high level alarm value.
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| CN202010025793.8A CN111075794B (en) | 2020-01-10 | 2020-01-10 | Method and device for monitoring leakage of hydraulic system |
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| CN202010025793.8A CN111075794B (en) | 2020-01-10 | 2020-01-10 | Method and device for monitoring leakage of hydraulic system |
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