Flow control system of hydraulic power machine

Abstract

The invention relates to the technical field of hydraulic power machine flow control, and discloses a hydraulic power machine flow control system which comprises a data acquisition module composed of a hydraulic power machine flow acquisition unit, a hydraulic power machine hydraulic acquisition unit and a hydraulic power machine liquid temperature acquisition unit. According to the flow control system of the hydraulic power machine, the temperature value and the pressure value of liquid at the corresponding flow threshold flow velocity are calculated according to the set flow threshold, the temperature value and the pressure value serve as the corresponding threshold values, and the pressure value, the flow value and the temperature value during working of the hydraulic power machine are collected through the data collection module; according to the method, the flow of the hydraulic power machine is monitored only through the flow sensing unit, the corresponding correction value is calculated, the correction value is compared with the corresponding threshold value, the hydraulic power machine is judged through the multi-dimensional angle, the situation that the flow of the hydraulic power machine is monitored only through the flow sensing unit is avoided, judgment depends on the multi-dimensional angle is avoided, and the judgment accuracy is improved; the stability and working precision of the hydraulic power machine are prevented from being reduced by errors.

Description

Technical Field

[0001] The invention relates to the technical field of flow control of hydraulic power machines, in particular to a flow control system of a hydraulic power machine. Background Art

[0002] A hydraulic power machine is a mechanical device that uses liquid (usually oil) as a means of transmitting power. It is usually composed of components such as a hydraulic pump, a hydraulic cylinder, and a hydraulic motor, and achieves mechanical movement or performs work tasks through the flow and pressure transmission of liquid in a pipeline. Hydraulic power machines are widely used in various industrial fields, such as machinery manufacturing, construction engineering, aerospace, etc. Their advantages include high power density, smooth operation, and precise control; The flow control system of a hydraulic power machine usually includes components such as flow valves, throttle valves, flow sensors and control units. Through the coordinated work of these components, precise control of the liquid flow in the hydraulic system is achieved. At present, flow sensors are usually used to collect the actual flow of liquid through the system, and calculate whether the flow change reaches the manually preset value, so as to determine whether the flow meets the actual demand. However, a single flow sensor will have errors after long-term use, resulting in a certain deviation between the actual flow and the set value, affecting the stability and working accuracy of the hydraulic power machine. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a hydraulic power machine flow control system, which has the function of calculating the liquid temperature value and pressure value at the corresponding flow threshold flow rate according to the set flow threshold, and taking the temperature value and pressure value as the corresponding threshold, collecting the pressure value, flow value and temperature value of the hydraulic power machine when it is working through the data acquisition module, and calculating the corresponding correction value, and comparing the correction value with the corresponding threshold, and judging the hydraulic power machine from a multi-dimensional perspective. When a single flow sensor has errors after long-term use, there will be a certain deviation between the actual flow and the set value, which will affect the stability and working accuracy of the hydraulic power machine, avoid monitoring the flow of the hydraulic power machine only through the flow sensor unit, rely on multi-dimensional angle judgment, improve the accuracy of the judgment, avoid errors that reduce the stability and working accuracy of the hydraulic power machine, and solve the above-mentioned problems.

[0004] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A flow control system for a hydraulic power machine, characterized in that it includes a data acquisition module, a data processing module and a central control unit; The data acquisition module is composed of a hydraulic power machine flow acquisition unit, a hydraulic power machine hydraulic pressure acquisition unit and a hydraulic power machine liquid temperature acquisition unit; The hydraulic power machine flow acquisition unit is used to acquire the flow value of the hydraulic power machine when it is working. , and the hydraulic power machine flow collection unit will collect 5 flow values ​​within 5 seconds A traffic data set is formed and sent to the data processing module through the network; The hydraulic pressure collection unit of the hydraulic power machine is used to collect the liquid pressure value of the hydraulic power machine when it is working. , and the hydraulic power machine hydraulic pressure collection unit will collect 10 liquid pressure values ​​within 5 seconds Form a pressure data set and send it to the data processing module through the network; The hydraulic power machine liquid temperature collection unit is used to collect the liquid temperature value of the hydraulic power machine when it is working. , and the hydraulic power machine liquid temperature collection unit will collect 5 liquid temperature values ​​within 5 seconds A temperature data set is formed and sent to the data processing module through the network; The data processing module is used to pre-process the data in the flow data set, pressure data set and temperature data set, and obtain the flow correction value , Pressure correction value And temperature correction value ; The data processing module is preset with a flow threshold The data processing module is based on the flow threshold Calculate the current flow threshold according to the parameters of the power machine Pressure threshold below And temperature threshold ; The data processing module converts the flow correction value , Pressure correction value and temperature correction value The flow threshold , Pressure threshold and temperature thresholds By contrast, when any of the values ​​exceeds its corresponding threshold, the data processing module determines that the flow of the hydraulic power machine is abnormal and sends a warning signal to the central control unit; The central control unit is used to send warning information to the operation and maintenance personnel after receiving the warning signal.

[0005] Preferably, the traffic data set is , the pressure data set is , the temperature data set is .

[0006] Preferably, the flow correction value The algorithm formula is as follows: In the formula, Indicates that the traffic data set has 5 traffic values. Indicates that the calculation starts from the first flow value in the flow data set, that is, start, Indicates the fifth flow value in the current flow data set.

[0007] Preferably, the pressure correction value The algorithm formula is as follows: In the formula, 10 means there are 10 pressure values ​​in the pressure data set. Indicates that the calculation starts from the first pressure value in the pressure data set. Represents the mean of all pressure data values ​​in the pressure dataset.

[0008] Preferably, the temperature correction value The algorithm formula is as follows: In the formula, 5 means there are 5 temperature values ​​in the temperature data set. Indicates that the calculation starts from the first temperature value in the temperature data set, that is, start, Indicates the fifth temperature value in the temperature data set.

[0009] Preferably, the pressure threshold The algorithm is shown below: In the formula, Indicates the friction coefficient of the hydraulic power machine pipeline. This coefficient is a fixed value. The friction coefficient of the pipeline material is known. Indicates the length of the hydraulic power machine pipeline, Indicates the diameter of the hydraulic power machine pipeline, Indicates the density value of the fluid in the hydraulic power machine pipeline.

[0010] Preferably, the temperature threshold The algorithm formula is as follows: In the formula, Indicates the total mass of the fluid in the hydraulic power pipeline, It indicates the amount of heat released by the liquid during movement. This value is related to the composition of the fluid and is a fixed value.

[0011] Preferably, the data processing module calculates the flow correction value , Pressure correction value , Temperature correction value , Traffic threshold , Pressure threshold and temperature thresholds Temporarily stored in its internal storage medium.

[0012] Preferably, the steps of the data analysis module determining whether the flow of the hydraulic power machine is abnormal are as follows: The flow correction value With flow threshold In contrast, when the flow correction value Greater than the flow threshold When the error occurs, an abnormal signal 1 is issued; The pressure correction value With pressure threshold In contrast, when the pressure correction value Greater than the pressure threshold When the error occurs, abnormal signal 2 is issued; The temperature correction value With temperature threshold By contrast, when the temperature correction value Greater than the temperature threshold When the abnormal signal is three, When the data analysis module generates abnormal signal one, abnormal signal two or abnormal signal three, an early warning signal is issued.

[0013] Preferably, after receiving the warning signal, the central control unit not only issues a warning to the operation and maintenance personnel, but also displays the abnormal value through its display terminal.

[0014] Compared with the prior art, the present invention provides a hydraulic power machine flow control system, which has the following beneficial effects: The present invention calculates the liquid temperature value and pressure value under the corresponding flow threshold flow rate according to the set flow threshold, and uses the temperature value and pressure value as the corresponding threshold. The pressure value, flow value and temperature value of the hydraulic power machine when working are collected through the data acquisition module, and the corresponding correction value is calculated. The correction value is compared with the corresponding threshold, and the hydraulic power machine is judged from a multi-dimensional perspective. When a single flow sensor has errors after long-term use, there will be a certain deviation between the actual flow and the set value, which affects the stability and working accuracy of the hydraulic power machine. It is avoided that the flow of the hydraulic power machine is monitored only by the flow sensor unit. Relying on multi-dimensional angle judgment, the accuracy of the judgment is improved, and the error reduces the stability and working accuracy of the hydraulic power machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the system flow of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] At present, the flow rate of hydraulic power machine usually relies on a single flow sensor to collect the liquid flow rate in the hydraulic power machine and judge whether it meets the preset threshold. However, after a long time of use, the accuracy of a single flow sensor will decrease, which will lead to a certain error between the actual flow and the preset value. To solve this problem, a hydraulic power machine flow control system is proposed to improve the judgment error of a single flow sensor. Please refer to Figure 1 ,The system includes a data acquisition module, a data processing module and a central control unit; The data acquisition module consists of a hydraulic power machine flow acquisition unit, a hydraulic power machine hydraulic pressure acquisition unit, and a hydraulic power machine liquid temperature acquisition unit. By collecting the flow, temperature, and pressure data of the liquid in the hydraulic power machine while the hydraulic power machine is working, the hydraulic power machine can be analyzed and judged from a multi-dimensional perspective to provide reliable data support. These data sets are: The flow data set is , the pressure data set is , the temperature data set is ; The hydraulic power machine flow acquisition unit is used to collect the flow value of the hydraulic power machine when it is working. The hydraulic pressure collection unit of the hydraulic power machine is used to collect the liquid pressure value of the hydraulic power machine when it is working. The hydraulic power machine liquid temperature collection unit is used to collect the liquid temperature value of the hydraulic power machine when it is working. , and the hydraulic power machine flow collection unit will collect 5 flow values ​​within 5 seconds To form a flow data set, the hydraulic power machine hydraulic pressure acquisition unit collects 10 liquid pressure values ​​continuously for 5 seconds. The pressure data set and the hydraulic power machine liquid temperature acquisition unit will collect 5 liquid temperature values ​​within 5 seconds Form a temperature data set and send these data sets to the data processing module through the network; The data processing module is used to pre-process the data in the flow data set, pressure data set and temperature data set, and obtain the flow correction value , Pressure correction value And temperature correction value By calculating the correction value in the corresponding data set, the accuracy of the corresponding data set data is improved, so that the results produced when analyzing and processing it are more accurate, errors are reduced, and misjudgments are reduced; the corresponding correction value calculation method is as follows: Flow correction value The algorithm formula is as follows: In the formula, Indicates that the traffic data set has 5 traffic values. Indicates that the calculation starts from the first flow value in the flow data set, that is, start, Indicates the fifth flow value in the current flow data set; Pressure correction value The algorithm formula is as follows: In the formula, 10 means there are 10 pressure values ​​in the pressure data set. Indicates that the calculation starts from the first pressure value in the pressure data set. Represents the mean of all pressure data values ​​in the pressure data set; Temperature correction value The algorithm formula is as follows: In the formula, 5 means there are 5 temperature values ​​in the temperature data set. Indicates that the calculation starts from the first temperature value in the temperature data set, that is, start, Indicates the fifth temperature value in the temperature data set; After the data analysis module has calculated the corrected values ​​of these data, it temporarily stores these values ​​in its internal storage medium; The data processing module has a preset flow threshold , and the flow threshold It is a manually set value, which is used to manually control the liquid flow of the hydraulic power machine. At the same time, according to the flow threshold , combined with the composition of the liquid, the friction coefficient and length of the hydraulic power machine pipeline material, calculate the corresponding pressure threshold and temperature thresholds , by manually setting the flow threshold , calculate the corresponding liquid flow rate at the flow threshold When the pressure and temperature of the liquid are used as two thresholds for judgment, the operating state of the hydraulic power machine can be judged in multiple dimensions. The specific algorithm is as follows: Pressure threshold The algorithm is shown below: In the formula, Indicates the friction coefficient of the hydraulic power machine pipeline. This coefficient is a fixed value. The friction coefficient of the pipeline material is known. Indicates the length of the hydraulic power machine pipeline, Indicates the diameter of the hydraulic power machine pipeline, Indicates the density value of the fluid in the hydraulic power machine pipeline; Temperature threshold The algorithm formula is as follows: In the formula, Indicates the total mass of the fluid in the hydraulic power pipeline, Indicates the amount of heat released by the liquid during movement. This value is related to the composition of the fluid and is a fixed value. When the data analysis module sets the preset flow threshold and the calculated pressure threshold and temperature thresholds Temporarily store it in its internal storage medium and compare it with the multiple data correction values ​​calculated previously to determine the state of the hydraulic power machine. The specific judgment criteria are as follows: The flow correction value With flow threshold In contrast, when the flow correction value Greater than the flow threshold When the error occurs, an abnormal signal 1 is issued; The pressure correction value With pressure threshold In contrast, when the pressure correction value Greater than the pressure threshold When the error occurs, abnormal signal 2 is issued; The temperature correction value With temperature threshold By contrast, when the temperature correction value Greater than the temperature threshold When the abnormal signal is three, When the data analysis module generates any one of the above three abnormal signals, the data analysis module issues a warning signal and sends the warning signal to the central control unit.

[0018] The central control unit is used to send warning information to the operation and maintenance personnel after receiving the warning signal, and its display terminal shows abnormal values ​​to assist the operation and maintenance personnel in referring to the specific data of the fault.

[0019] By calculating the liquid temperature value and pressure value under the corresponding flow threshold flow rate according to the set flow threshold, and taking the temperature value and pressure value as the corresponding threshold, the pressure value, flow value and temperature value of the hydraulic power machine when working are collected through the data acquisition module, and the corresponding correction value is calculated, and the correction value is compared with the corresponding threshold. The hydraulic power machine is judged from a multi-dimensional perspective. When a single flow sensor has errors after long-term use, there will be a certain deviation between the actual flow and the set value, which affects the stability and working accuracy of the hydraulic power machine. It is avoided that the flow of the hydraulic power machine is monitored only by the flow sensor unit. Relying on multi-dimensional angle judgment, the accuracy of the judgment is improved, and the error is avoided from reducing the stability and working accuracy of the hydraulic power machine.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flow control system for a hydraulic power machine, characterized in that: It includes data acquisition module, data processing module and central control unit; The data acquisition module is composed of a hydraulic power machine flow acquisition unit, a hydraulic power machine hydraulic pressure acquisition unit and a hydraulic power machine liquid temperature acquisition unit; The hydraulic power machine flow acquisition unit is used to acquire the flow value of the hydraulic power machine when it is working. , and the hydraulic power machine flow collection unit will collect 5 flow values ​​within 5 seconds A traffic data set is formed and sent to the data processing module through the network; The hydraulic pressure collection unit of the hydraulic power machine is used to collect the liquid pressure value of the hydraulic power machine when it is working. , and the hydraulic power machine hydraulic pressure collection unit will collect 10 liquid pressure values ​​within 5 seconds Form a pressure data set and send it to the data processing module through the network; The hydraulic power machine liquid temperature collection unit is used to collect the liquid temperature value of the hydraulic power machine when it is working. , and the hydraulic power machine liquid temperature collection unit will collect 5 liquid temperature values ​​within 5 seconds A temperature data set is formed and sent to the data processing module through the network; The data processing module is used to pre-process the data in the flow data set, pressure data set and temperature data set, and obtain the flow correction value , Pressure correction value And temperature correction value ; The data processing module is preset with a flow threshold The data processing module is based on the flow threshold Calculate the current flow threshold according to the parameters of the power machine Pressure threshold below And temperature threshold ; The data processing module converts the flow correction value , Pressure correction value and temperature correction value The flow threshold , Pressure threshold and temperature thresholds By contrast, when any of the values ​​exceeds its corresponding threshold, the data processing module determines that the flow of the hydraulic power machine is abnormal and sends a warning signal to the central control unit; The central control unit is used to send warning information to the operation and maintenance personnel after receiving the warning signal.

2. A hydraulic power machine flow control system according to claim 1, characterized in that: The traffic data set is , the pressure data set is , the temperature data set is .

3. A hydraulic power machine flow control system according to claim 2, characterized in that: The flow correction value The algorithm formula is as follows: In the formula, Indicates that the traffic data set has 5 traffic values. Indicates that the calculation starts from the first flow value in the flow data set, that is, start, Indicates the fifth flow value in the current flow data set.

4. A hydraulic power machine flow control system according to claim 2, characterized in that: The pressure correction value The algorithm formula is as follows: In the formula, 10 means there are 10 pressure values ​​in the pressure data set. Indicates that the calculation starts from the first pressure value in the pressure data set. Represents the mean of all pressure data values ​​in the pressure dataset.

5. A hydraulic power machine flow control system according to claim 1, characterized in that: The temperature correction value The algorithm formula is as follows: In the formula, 5 means there are 5 temperature values ​​in the temperature data set. Indicates that the calculation starts from the first temperature value in the temperature data set, that is, start, Indicates the fifth temperature value in the temperature data set.

6. A hydraulic power machine flow control system according to claim 1, characterized in that: The pressure threshold The algorithm is shown below: In the formula, Indicates the friction coefficient of the hydraulic power machine pipeline. This coefficient is a fixed value. The friction coefficient of the pipeline material is known. Indicates the length of the hydraulic power machine pipeline, Indicates the diameter of the hydraulic power machine pipeline, Indicates the density value of the fluid in the hydraulic power machine pipeline.

7. A hydraulic power machine flow control system according to claim 1, characterized in that: The temperature threshold The algorithm formula is as follows: In the formula, Indicates the total mass of the fluid in the hydraulic power pipeline, It indicates the amount of heat released by the liquid during movement. This value is related to the composition of the fluid and is a fixed value.

8. A hydraulic power machine flow control system according to claim 3 or 4 or 5 or 6 or 7, characterized in that: The data processing module calculates the flow correction value , Pressure correction value , Temperature correction value , Traffic threshold , Pressure threshold and temperature thresholds Temporarily stored in its internal storage medium.

9. A hydraulic power machine flow control system according to claim 8, characterized in that: The steps of the data analysis module to determine whether the flow of the hydraulic power machine is abnormal are as follows: The flow correction value With flow threshold In contrast, when the flow correction value Greater than the flow threshold When the error occurs, an abnormal signal 1 is issued; The pressure correction value With pressure threshold In contrast, when the pressure correction value Greater than the pressure threshold When the error occurs, abnormal signal 2 is issued; The temperature correction value With temperature threshold By contrast, when the temperature correction value Greater than the temperature threshold When the abnormal signal is three, When the data analysis module generates abnormal signal one, abnormal signal two or abnormal signal three, an early warning signal is issued.

10. A hydraulic power machine flow control system according to claim 9, characterized in that: After receiving the warning signal, the central control unit not only issues a warning to the operation and maintenance personnel, but also displays the abnormal value through its display terminal.

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