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CN-122014588-A - Leak detection method of vacuum pump assembly and vacuum generation system

CN122014588ACN 122014588 ACN122014588 ACN 122014588ACN-122014588-A

Abstract

The invention provides a leakage detection method and a vacuum generation system of a vacuum pump assembly, wherein the method comprises the steps of obtaining a current working air pressure value of a working port of the vacuum pump assembly under a vacuum working condition, wherein the working port is a working port applying vacuum adsorption force to a sucker, determining a first moment when the working port reaches the preset air pressure value and a second moment when the working port reaches the working air pressure value under the condition that the working air pressure value is larger than the preset air pressure value, wherein the preset air pressure value is the minimum air pressure value reached by the working port, determining the leakage rate of the vacuum pump assembly according to the first moment, the second moment, the working air pressure value and the preset air pressure value, and executing isolation operation on the vacuum pump assembly under the condition that the leakage rate is larger than a leakage rate threshold value.

Inventors

  • MO SHIZHONG
  • LI WENJIE
  • ZHANG DOUYUN

Assignees

  • 苏州汇川技术有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (13)

  1. 1. A leak detection method for a vacuum pump assembly, comprising: Acquiring a current working air pressure value of a working port of a vacuum pump assembly under a vacuum working condition, wherein the working port is a working port for applying vacuum adsorption force to a sucker; Determining a first moment when the working port reaches the preset air pressure value and a second moment when the working port reaches the working air pressure value under the condition that the working air pressure value is larger than the preset air pressure value, wherein the preset air pressure value is the minimum air pressure value reached by the working port; Determining a leakage rate of the vacuum pump assembly according to the first moment, the second moment, the working air pressure value and the preset air pressure value; and performing an isolation operation on the vacuum pump assembly to isolate the vacuum pump assembly from leakage in the event that the leakage rate is greater than a leakage rate threshold.
  2. 2. The leak detection method of a vacuum pump assembly of claim 1, wherein the step of performing an isolation operation on the vacuum pump assembly if the leak rate is greater than a leak rate threshold comprises: And controlling the vacuum pump assembly to end the vacuum working condition.
  3. 3. A leak detection method for a vacuum pump assembly as defined in claim 2, wherein, The vacuum pump assembly comprises a vacuum supply valve, wherein the vacuum supply valve is arranged on a pipeline between the working port and the vacuumizing port and is used for switching on or switching off the connection between the working port and the vacuumizing port; controlling the vacuum pump assembly to end the vacuum condition, comprising: and controlling the vacuum supply valve to be closed so as to shut off the connection between the working port and the vacuumizing port.
  4. 4. A leak detection method for a vacuum pump assembly as defined in claim 3, wherein, Controlling the vacuum supply valve to close to shut off the connection between the work port and the evacuation port, including: Determining whether the vacuum supply valve has a self-holding function, the self-holding function being a function of driving a valve element of the vacuum supply valve to reset after closing the vacuum supply valve; And if the vacuum supply valve does not have the self-retaining function, controlling the valve core to be switched to a reset state.
  5. 5. The leak detection method of a vacuum pump assembly of claim 1, wherein performing an isolation operation on the vacuum pump assembly if the leak rate is greater than a leak rate threshold comprises: Under the condition that the vacuum pump assembly has a self-holding function, a vacuum supply valve is controlled to be closed so as to shut off the connection between the working port and the vacuumizing port; The vacuum supply valve is arranged on a pipeline between the working port and the vacuumizing port and is used for switching on or switching off the connection between the working port and the vacuumizing port, and the vacuumizing port is communicated with the vacuumizing end of the vacuum pump assembly.
  6. 6. The leak detection method of a vacuum pump assembly of claim 1, wherein performing an isolation operation on the vacuum pump assembly if the leak rate is greater than a leak rate threshold comprises: Controlling a vacuum supply valve to be closed under the condition that the vacuum pump assembly has no self-holding function, so as to shut off the connection between the working port and the vacuumizing port; after the vacuum breaking valve is opened for a preset time, the vacuum breaking valve is closed; the vacuum supply valve is arranged on a pipeline between the working port and the vacuumizing port and is used for switching on or switching off the connection between the working port and the vacuumizing port, and the vacuumizing port is communicated with the vacuumizing end of the vacuum pump assembly.
  7. 7. The leak detection method of a vacuum pump assembly according to claim 5 or 6, further comprising, prior to the step of controlling the closing of the vacuum supply valve: acquiring the equipment name of the vacuum pump assembly; And determining that the vacuum pump assembly has a self-holding function when the equipment name contains characteristic characters, and otherwise, determining that the vacuum pump assembly does not have the self-holding function.
  8. 8. The leak detection method of a vacuum pump assembly of claim 1, wherein the leak rate of the vacuum pump assembly is determined from the first time instant, the second time instant, the operating air pressure value, and the preset air pressure value according to the following formula: Subtracting a preset air pressure value from the current working air pressure value to obtain an air pressure difference, wherein the air pressure difference is divided by a difference value between the first moment and the second moment.
  9. 9. The method of claim 1, wherein after the step of determining the leak rate of the vacuum pump assembly based on the first time, the second time, the operating air pressure value, and the preset air pressure value, further comprising: And if the leakage rate is smaller than or equal to the leakage rate threshold, updating the preset air pressure value to the working air pressure value, and updating the first time to the second time.
  10. 10. The method of claim 1, wherein after the step of obtaining the current operating air pressure value of the operating port of the vacuum pump assembly in the vacuum condition, further comprising: And under the condition that the working air pressure value is smaller than the preset air pressure value, updating the preset air pressure value to the working air pressure value, and updating the first moment to the second moment.
  11. 11. A vacuum generating system comprising a plurality of vacuum pump assemblies in parallel, each of said vacuum pump assemblies employing the steps of the leak detection method of the vacuum pump assembly of any one of claims 1 to 10.
  12. 12. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, realizes the steps in the leak detection method of a vacuum pump assembly according to any one of claims 1 to 10.
  13. 13. A computer program product comprising computer instructions which, when executed by a processor, implement the steps of the leak detection method of a vacuum pump assembly according to any one of claims 1 to 10.

Description

Leak detection method of vacuum pump assembly and vacuum generation system Technical Field The embodiment of the invention relates to the technical field of industrial production equipment, in particular to a leak detection method of a vacuum pump assembly and a vacuum generation system. Background In industrial production, the use of factory vacuum equipment to carry workpieces is very widespread. The factory vacuum equipment mainly comprises a vacuum pump, a vacuum pump assembly, a vacuum sucker system, a vacuum lifting appliance and the like, and the principle is that a vacuum (low pressure) state is created, maintained or utilized, for example, the vacuum sucker assembly is used for generating vacuum adsorption force (low pressure, -99 kpa-0 kpa) to suck a workpiece, so that the workpiece is convenient to carry. The plurality of vacuum pump assemblies are connected in parallel by sharing a set of vacuum pumps. The existing leakage detection method only can judge whether the vacuum pump assembly leaks or not, and under the condition of leakage, the situation that the leaked vacuum pump assembly leaks other vacuum pump assemblies connected in parallel with the leaked vacuum pump assembly cannot be avoided in time, namely, one vacuum pump assembly leaks, the workpiece connected through the sucking disc of the vacuum pump assembly is at risk of falling, the workpiece connected through the sucking disc of the vacuum pump assembly is also at risk of falling, and accordingly reliability of carrying the workpiece by the factory vacuum equipment is poor. Disclosure of Invention The embodiment of the invention provides a leakage detection method and a related device for a vacuum pump assembly, which are used for solving the problems that the existing leakage detection method only can judge whether the vacuum pump assembly is leaked or not, and under the condition of leakage, the leakage condition of other vacuum pump assemblies connected in parallel with the leaked vacuum pump assembly cannot be avoided in time, namely, one vacuum pump assembly leaks, not only does a workpiece connected through a sucker generate a falling risk, but also the workpiece connected through the sucker of the other vacuum pump assembly connected in parallel with the vacuum pump assembly generates a falling risk, so that the reliability of carrying the workpiece by factory vacuum equipment is poor. In order to solve the technical problems, the invention is realized as follows: In a first aspect, an embodiment of the present invention provides a leak detection method of a vacuum pump assembly, including: Acquiring a current working air pressure value of a working port of a vacuum pump assembly under a vacuum working condition, wherein the working port is a working port for applying vacuum adsorption force to a sucker; Determining a first moment when the working port reaches the preset air pressure value and a second moment when the working port reaches the working air pressure value under the condition that the working air pressure value is larger than the preset air pressure value, wherein the preset air pressure value is the minimum air pressure value reached by the working port; Determining a leakage rate of the vacuum pump assembly according to the first moment, the second moment, the working air pressure value and the preset air pressure value; And performing an isolation operation on the vacuum pump assembly in the event that the leak rate is greater than a leak rate threshold. Optionally, the step of performing an isolation operation on the vacuum pump assembly if the leak rate is greater than a leak rate threshold comprises: And controlling the vacuum pump assembly to end the vacuum working condition. Optionally, the vacuum pump assembly comprises a vacuum supply valve, wherein the vacuum supply valve is arranged on a pipeline between the working port and the vacuumizing port and is used for switching on or switching off the connection between the working port and the vacuumizing port; controlling the vacuum pump assembly to end the vacuum condition, comprising: and controlling the vacuum supply valve to be closed so as to shut off the connection between the working port and the vacuumizing port. Optionally, controlling the vacuum supply valve to close to shut off the connection between the work port and the evacuation port previously includes: Determining whether the vacuum supply valve has a self-holding function, the self-holding function being a function of driving a valve element of the vacuum supply valve to reset after closing the vacuum supply valve; And if the vacuum supply valve does not have the self-retaining function, controlling the valve core to be switched to a reset state. Optionally, performing an isolation operation on the vacuum pump assembly if the leak rate is greater than a leak rate threshold, comprising: Under the condition that the vacuum pump assembly has a self-holding function, a vacuum supply valve is