Micro servo electric cylinder load reliability test system and method

Abstract

The invention discloses a miniature servo electric cylinder load reliability test system and method, and belongs to the technical field of electric cylinder testing, and the system specifically comprises a test platform, a load control unit, an operation monitoring unit, a preliminary test screening unit, a repeated association test unit and an environment tolerance test unit. According to the method, the load operation performance of the servo electric cylinder is tested in combination with different load types, different operation data are detected for different load types to quantify the operation stability of the electric cylinder, the reliability verification efficiency of the electric cylinder under multiple working conditions is improved, a progressive test scheme is implemented, and the test efficiency is improved. Specifically, manufacturing defects are efficiently recognized and invalid data interference is reduced through a first-round basic test (static / dynamic / transient load), repeated test is performed through two-round stepped load progressive increase adjustment, performance limit is accurately positioned, a high-temperature test environment is added for a high-reliability electric cylinder passing a limit load test, a real and harsh working condition is further simulated, and a test result is obtained. And evaluating the attenuation degree of the reliability of the electric cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of electric cylinder testing, and more particularly to a micro servo electric cylinder load reliability testing system and method. Background Art

[0002] A servo cylinder is an electric actuator that combines a motor and a mechanical structure to precisely control position or force. Compared to ordinary servo cylinders, micro servo cylinders are smaller in size and have relatively lower power, but require higher precision.

[0003] The main purpose of load testing of micro servo cylinders is to verify their performance, reliability and safety under actual working conditions, and to ensure that they can withstand the expected load in actual work without failure or performance degradation.

[0004] Traditional test modes and methods are single, do not simulate the complex load changes in actual application scenarios, and are divorced from actual working conditions. The key data monitored by a single test mode is not comprehensive enough, and it is impossible to effectively analyze the overall operating performance of the micro servo electric cylinder under different loads. The test accuracy of load reliability needs to be improved. Therefore, a micro servo electric cylinder load reliability test system and method are proposed. Summary of the Invention

[0005] The present invention aims to solve the existing problems and provide a micro servo electric cylinder load reliability testing system and method compared with the existing technology.

[0006] The object of the present invention can be achieved by the following technical solutions: A micro servo electric cylinder load reliability test system, comprising a test platform, a load control unit, an operation monitoring unit, a preliminary test screening unit, a repeated correlation test unit, and an environmental tolerance test unit; The test platform marks multiple micro servo cylinders to be tested as test objects and numbers them; The load control unit is used to apply a set load to the telescopic end of the test object. The load types include static load, dynamic alternating load and instantaneous impact load; The operation monitoring unit is used to collect the corresponding operation data of the test object under different load types and send it to the preliminary test screening unit. The preliminary test screening unit judges whether the preliminary test stability of the test object meets the requirements based on the operation data, divides the test object into normal objects and abnormal objects, and sends the normal object number to the repeated association test unit; The repeated correlation test unit generates a correlation test instruction and sends it to the load control unit. The load control unit adjusts the static load, dynamic alternating load, and instantaneous impact load upward in a step-by-step manner and collects operation data through the operation monitoring unit. The repeated correlation test unit judges the reliability of the normal object load based on the operation data analysis, generates a strong reliability signal and a weak reliability signal, and sends the strong reliability signal to the environmental tolerance test unit. The environmental tolerance test unit is used to add a high-temperature test environment to a normal object that generates a strong reliability signal, and evaluate the reliability attenuation degree of the normal object in the high-temperature environment.

[0007] As a preferred embodiment of the present invention, the operation monitoring unit collects static data of the test object under static load, including current fluctuation, temperature fluctuation and position offset; collects dynamic data of the test object under dynamic alternating load, including position fluctuation value, speed fluctuation value and temperature rise rate; collects transient response data of the test object under transient impact load, including position callback speed, speed stabilization time and amplitude attenuation speed; wherein static data, dynamic data and transient response data are collectively referred to as operation data.

[0008] As a preferred embodiment of the present invention, the process of the initial test screening unit determining whether the initial stability of the test object meets the requirements includes: comparing and analyzing various static data with corresponding preset static data thresholds; when various static data are within the corresponding preset static data thresholds, generating a static normal signal; otherwise, generating a static abnormal signal; Compare and analyze each dynamic data with the corresponding preset dynamic data threshold. When each dynamic data is within the corresponding preset dynamic data threshold, a dynamic normal signal is generated; otherwise, a dynamic abnormal signal is generated. The transient data are compared and analyzed with the corresponding preset transient data thresholds. When the transient data are all within the corresponding preset transient data threshold range, a transient normal signal is generated; otherwise, a transient abnormal signal is generated.

[0009] As a preferred embodiment of the present invention, when any one of a static abnormal signal, a dynamic abnormal signal or a transient abnormal signal is generated, it is judged that the operating stability of the test object does not meet the requirements and the test object is classified as an abnormal object. When a static normal signal, a dynamic normal signal and a transient normal signal are generated at the same time, it is judged that the operating stability of the test object meets the requirements and the test object is classified as a normal object.

[0010] As a preferred embodiment of the present invention, the process of repeatedly determining the reliability of the normal object load by the association test unit includes: Through the operation monitoring unit, multiple sets of static data, dynamic data and transient data of normal objects are obtained, and static data sequences, dynamic data sequences and transient data sequences are generated. The load is used as the x-axis and the corresponding operation data collected in real time is used as the measured value as the Y-axis. The measured value-load linear curve of each operation data in each sequence is drawn. According to all the measured value-load linear curves, judgment is made to generate strong reliability signals and weak reliability signals.

[0011] As a preferred embodiment of the present invention, the process of determining based on all measured value-load linear curves includes: Obtain the theoretical linear fitting curves of each operating data in each sequence in the test platform, and calculate the degree of overlap between all measured value-load linear curves and the corresponding theoretical linear fitting curves; Calculate the sum of various coincidences under static load, mark it as static reliability value, calculate the sum of various coincidences under dynamic load, mark it as dynamic reliability value, calculate the sum of various coincidences under transient load, mark it as transient reliability value; The static reliability value, dynamic reliability value and transient reliability value are compared with the corresponding preset reliability parameter thresholds respectively. When the static reliability value, dynamic reliability value and transient reliability value are all greater than or equal to the preset reliability parameter thresholds, a strong reliability signal is generated; otherwise, a weak reliability signal is generated.

[0012] As a preferred embodiment of the present invention, the environmental tolerance test unit obtains the static reliability value, dynamic reliability value and transient reliability value of the normal object in normal temperature and high temperature environments respectively, calculates the difference between the reliability values in different temperature environments before and after, and obtains the static reliability attenuation value, dynamic reliability attenuation value and transient reliability attenuation value respectively, and judges the reliability attenuation degree of the normal object in a high temperature environment through attenuation threshold calculation.

[0013] The present invention also proposes a method for testing the load reliability of a micro servo electric cylinder, comprising the following steps: Step 1: Apply a set load to the telescopic end of the test object, and judge whether the initial stability of the test object meets the requirements based on the operating data under different load types, and screen out normal objects; Step 2: For normal objects, adjust the load in a step-by-step manner, and analyze the reliability of the load of normal objects based on the operating data; Step 3: Add a high-temperature test environment to the normal object that generates a strong reliability signal to evaluate the reliability attenuation of the normal object in the high-temperature environment.

[0014] Compared with the prior art, the advantages of the present invention are: This solution tests the load operating performance of servo electric cylinders based on different load types. Different operating data is detected for different load types to quantify the operating stability of the electric cylinder, improve the efficiency of reliability verification of the electric cylinder under multiple working conditions, and implement a step-by-step progressive testing solution. Specifically, the first round of basic testing (static / dynamic / transient load) is used to efficiently identify manufacturing defects and reduce invalid data interference. A second round of stepped load adjustment is used, and repeated testing is performed to obtain multiple sets of operating data. The operating data and load are used to draw a measured value-load linear curve, accurately locating performance limits, achieving a leap from "qualified" to "highly reliable" for the electric cylinder, and improving the accuracy of the load reliability judgment of the electric cylinder.

[0015] Based on the above content, for high-reliability electric cylinders that have passed the extreme load test, an additional high-temperature test environment is added to further simulate real harsh working conditions. The degree of attenuation of the electric cylinder's reliability performance in a high-temperature environment is evaluated, that is, the degree of impact of the harsh working environment on the operating reliability of the electric cylinder is determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the present invention; Figure 2 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0018] Example 1: The present invention discloses a micro servo electric cylinder load reliability test system, please refer to Figure 1 , including test platform, load control unit, operation monitoring unit, initial test screening unit, repeated correlation test unit and environmental tolerance test unit; The test platform marks multiple micro servo cylinders to be tested as test objects and numbers them; The load control unit is used to apply a set load to the telescopic end of the test object. The load types include static load, dynamic alternating load and instantaneous impact load; The operation detection unit is used to collect the corresponding operation data of the test object under different load types, and the operation data includes static data, dynamic data and transient response data; The operation monitoring unit collects static data of the test object under static load, including current fluctuation, temperature fluctuation and position offset; Collect dynamic data of the test object under dynamic alternating load, including position fluctuation value, speed fluctuation value and temperature rise rate; The transient response data of the test object under transient impact load is collected, including position callback speed, speed stabilization time and amplitude attenuation speed. The operation monitoring unit sends the operation data to the preliminary test screening unit.

[0019] The initial test screening unit determines whether the initial test stability of the test object meets the requirements based on the operating data. The specific process is as follows: Compare and analyze each static data with the corresponding preset static data threshold. When each static data is within the corresponding preset static data threshold, that is, the current is stable, the temperature is controllable, and the position has no drift, it means that the test object is running stably under the current static load, and a static normal signal is generated. On the contrary, if any static data is not within the corresponding preset static data threshold, that is, the current continues to rise or the temperature exceeds the limit or the position has a serious deviation, it means that the test object is running unstable, and a static abnormal signal is generated. Compare and analyze each dynamic data with the corresponding preset dynamic data threshold. When each dynamic data is within the corresponding preset dynamic data threshold, that is, the position and speed fluctuations are controllable and the temperature rise rate is controllable, a dynamic normal signal is generated. On the contrary, if any dynamic data is not within the corresponding preset static data threshold, that is, the position fluctuation is uncontrollable, the speed fluctuation is uncontrollable, or the temperature rise rate is uncontrollable, a dynamic abnormal signal is generated. Compare and analyze each transient data item with the corresponding preset transient data threshold value. When each transient data item is within the corresponding preset transient data threshold value range, a transient normal signal is generated; otherwise, a transient abnormal signal is generated. When any one of the static abnormal signal, the dynamic abnormal signal or the transient abnormal signal is generated, it is judged that the operation stability of the test object does not meet the requirements, and the test object is classified as an abnormal object. When the static normal signal, the dynamic normal signal and the transient normal signal are generated at the same time, it is judged that the operation stability of the test object meets the requirements, and the test object is classified as a normal object, and the normal object number is sent to the repeated association test unit; For electric cylinder load testing, static loads, dynamic loads, and transient loads are applied respectively. The corresponding monitoring data is used to determine whether the test object is normal or abnormal in the first round. The first round of basic testing (static / dynamic / transient loads) effectively identifies manufacturing defects and screens out abnormal objects. Abnormal samples in the first round should be transferred to the fault analysis process (such as disassembly, material testing, and control logic troubleshooting) rather than continuing with load sequence testing. This ensures that the second and subsequent rounds of test data only come from normal and reliable samples, reduces invalid data interference, and prevents abnormal samples from interfering with the performance baseline.

[0020] The repeated correlation test unit generates a correlation test instruction and sends it to the load control unit. The load control unit adjusts the static load, dynamic alternating load, and instantaneous impact load in a step-by-step manner and collects operation data through the operation monitoring unit. The repeated correlation test unit judges the reliability of the normal object load based on the operation data analysis. The specific process includes: The repeated correlation test unit obtains multiple sets of static data, dynamic data, and transient data of a normal object through the operation monitoring unit, generates a static data sequence with the multiple sets of static data, generates a dynamic data sequence with the multiple sets of dynamic data, and generates a transient data sequence with the multiple sets of transient data. The load is used as the x-axis and the corresponding operation data collected in real time as the measured value is used as the Y-axis. The measured value-load linear curve of each operation data in each sequence is drawn, such as the current fluctuation value-load linear curve, the temperature fluctuation value-load linear curve, and the position offset value-load linear curve for the static load; Repeat the correlation test unit to obtain the theoretical linear fitting curve of each operating data in each sequence in the test platform. Use trend line fitting comparison to calculate the coincidence degree between all measured value-load linear curves and the corresponding theoretical linear fitting curves. The higher the coincidence degree, the stronger the reliability. Calculate the sum of various coincidences under static load, mark it as static reliability value, calculate the sum of various coincidences under dynamic load, mark it as dynamic reliability value, calculate the sum of various coincidences under transient load, mark it as transient reliability value; Compare the static reliability value, dynamic reliability value, and transient reliability value with the corresponding preset reliability parameter thresholds respectively. When the static reliability value, dynamic reliability value, and transient reliability value are all greater than or equal to the preset reliability parameter thresholds, a strong reliability signal is generated; otherwise, a weak reliability signal is generated. During the second round of additional load sequence testing, higher intensity and more complex load sequences are applied to normal objects for testing, evaluating their reliability under composite load conditions, accurately locating performance limits, and achieving a leap from "qualified" to "highly reliable" for the electric cylinder, thereby improving the accuracy of the judgment of the electric cylinder's load reliability.

[0021] Example 2: Based on Example 1, this example adds a high-temperature test environment to the high-reliability electric cylinder that has passed the extreme load test to further simulate real harsh working conditions; The repeated correlation test unit sends the generated strong reliability signal to the environmental tolerance test unit. The environmental tolerance test unit is used to add a high-temperature test environment to the normal object that generates the strong reliability signal. The high temperature range of the high-temperature test environment is 60-80°C. This embodiment uses a high temperature environment of 70°C to evaluate the reliability attenuation degree of the normal object in the high temperature environment. The details are as follows: Obtain the static reliability value, dynamic reliability value, and transient reliability value of a normal object under normal temperature and high temperature environments, perform difference calculation on the reliability values under different temperature environments, and obtain the static reliability attenuation value, dynamic reliability attenuation value, and transient reliability attenuation value respectively; The static reliable attenuation value, dynamic reliable attenuation value and transient reliable attenuation value are compared with the preset attenuation thresholds respectively. When the static reliable attenuation value, the dynamic reliable attenuation value and the transient reliable attenuation value are all greater than the preset attenuation thresholds, it is judged that the reliable attenuation degree of the normal object in a high temperature environment is small. Conversely, it is judged that the reliable attenuation degree of the normal object in a high temperature environment is large, thereby improving the abnormal risk judgment under harsh working conditions.

[0022] Example 3: In combination with Example 1 and Example 2, the present invention also proposes a micro servo cylinder load reliability test method, please refer to Figure 2 , including the following steps: Step 1: Apply a set load to the telescopic end of the test object, and judge whether the initial stability of the test object meets the requirements based on the operating data under different load types, and screen out normal objects; Step 2: For normal objects, the load is adjusted upward in a step-by-step manner. The reliability of the load of normal objects is judged and analyzed based on the operating data to generate strong reliability signals and weak reliability signals respectively. Step 3: Add a high-temperature test environment to the normal object that generates a strong reliability signal to evaluate the reliability attenuation of the normal object in the high-temperature environment.

[0023] In summary, the load operating performance of the servo cylinder is tested in combination with different load types. Different operating data is detected for different load types to quantify the operating stability of the cylinder, improve the efficiency of the cylinder's reliability verification under multiple working conditions, and implement a step-by-step progressive testing plan. Specifically, the first round of basic testing (static / dynamic / transient load) effectively identifies manufacturing defects and reduces invalid data interference. The second round of stepped load adjustment accurately locates the performance limit, achieving a leap from "qualified" to "highly reliable" for the cylinder, and improving the accuracy of the cylinder load reliability judgment. For high-reliability electric cylinders that have passed the extreme load test, three rounds of environmental hardening testing are conducted to simulate real harsh working conditions. This evaluates the degree of degradation of the electric cylinder's reliability performance in a high-temperature environment, that is, to determine the extent to which harsh working conditions affect the reliability of the electric cylinder.

[0024] It should be added here that the multiple types of thresholds involved in the article, thresholds or preset values, preset ranges, etc. are set for result comparison and analysis in order to determine whether they are good or bad. The size of the values is set based on a combination of large-scale model analysis of sample data and manual experience to enter and store them, and can also be appropriately adjusted based on seasonal or common sense influencing conditions.

[0025] The above description is only a preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved conception of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A micro servo electric cylinder load reliability test system, characterized by: It includes a test platform, a load control unit, an operation detection unit, a preliminary test screening unit, a repeated correlation test unit, and an environmental tolerance test unit; The test platform marks multiple micro servo cylinders to be tested as test objects and numbers them; The load control unit is used to apply a set load to the telescopic end of the test object. The load types include static load, dynamic alternating load and instantaneous impact load; The operation monitoring unit is used to collect the corresponding operation data of the test object under different load types and send it to the preliminary test screening unit. The preliminary test screening unit judges whether the preliminary test stability of the test object meets the requirements based on the operation data, divides the test object into normal objects and abnormal objects, and sends the normal object number to the repeated association test unit; The repeated correlation test unit generates a correlation test instruction and sends it to the load control unit. The load control unit adjusts the static load, dynamic alternating load, and instantaneous impact load upward in a step-by-step manner and collects operation data through the operation monitoring unit. The repeated correlation test unit judges the reliability of the normal object load based on the operation data analysis, generates a strong reliability signal and a weak reliability signal, and sends the strong reliability signal to the environmental tolerance test unit. The environmental tolerance test unit is used to add a high-temperature test environment to a normal object that generates a strong reliability signal, and evaluate the reliability attenuation degree of the normal object in the high-temperature environment.

2. A micro servo electric cylinder load reliability test system according to claim 1, characterized in that: The operation detection unit collects static data of the test object under static load, including current fluctuation, temperature fluctuation and position offset; collects dynamic data of the test object under dynamic alternating load, including position fluctuation value, speed fluctuation value and temperature rise rate; collects transient response data of the test object under transient impact load, including position callback speed, speed stabilization time and amplitude attenuation speed; among them, static data, dynamic data and transient response data are collectively referred to as operation data.

3. A micro servo cylinder load reliability test system according to claim 2, characterized in that: The process of the initial test screening unit judging whether the initial stability of the test object meets the requirements includes: comparing and analyzing various static data with corresponding preset static data thresholds; when various static data are within the corresponding preset static data thresholds, a static normal signal is generated; otherwise, a static abnormal signal is generated; Compare and analyze each dynamic data with the corresponding preset dynamic data threshold. When each dynamic data is within the corresponding preset dynamic data threshold, a dynamic normal signal is generated; otherwise, a dynamic abnormal signal is generated. The transient data are compared and analyzed with the corresponding preset transient data thresholds. When the transient data are all within the corresponding preset transient data threshold range, a transient normal signal is generated; otherwise, a transient abnormal signal is generated.

4. A micro servo cylinder load reliability test system according to claim 3, characterized in that: When any one of the static abnormal signal, dynamic abnormal signal or transient abnormal signal is generated, it is judged that the operating stability of the test object does not meet the requirements and the test object is classified as an abnormal object. When the static normal signal, dynamic normal signal and transient normal signal are generated at the same time, it is judged that the operating stability of the test object meets the requirements and the test object is classified as a normal object.

5. The micro servo cylinder load reliability test system according to claim 4, characterized in that: The process of repeatedly correlating the test units to judge the reliability of normal object loads includes: Through the operation monitoring unit, multiple sets of static data, dynamic data and transient data of normal objects are obtained, and static data sequences, dynamic data sequences and transient data sequences are generated. The load is used as the x-axis and the corresponding operation data collected in real time is used as the measured value as the Y-axis. The measured value-load linear curve of each operation data in each sequence is drawn. According to all the measured value-load linear curves, judgment is made to generate strong reliability signals and weak reliability signals.

6. The micro servo cylinder load reliability testing system according to claim 5, characterized in that: The process of judging based on all measured values-load linear curves includes: Obtain the theoretical linear fitting curves of each operating data in each sequence in the test platform, and calculate the degree of overlap between all measured value-load linear curves and the corresponding theoretical linear fitting curves; Calculate the sum of various coincidences under static load, mark it as static reliability value, calculate the sum of various coincidences under dynamic load, mark it as dynamic reliability value, calculate the sum of various coincidences under transient load, mark it as transient reliability value; The static reliability value, dynamic reliability value and transient reliability value are compared with the corresponding preset reliability parameter thresholds respectively. When the static reliability value, dynamic reliability value and transient reliability value are all greater than or equal to the preset reliability parameter thresholds, a strong reliability signal is generated; otherwise, a weak reliability signal is generated.

7. The micro servo cylinder load reliability test system according to claim 6, characterized in that: The environmental tolerance test unit obtains the static reliability value, dynamic reliability value and transient reliability value of the normal object in normal temperature and high temperature environments respectively, calculates the difference between the reliability values under different temperature environments before and after, and obtains the static reliability attenuation value, dynamic reliability attenuation value and transient reliability attenuation value respectively. Through the attenuation threshold calculation, the reliability attenuation degree of the normal object in the high temperature environment is judged.

8. A method for testing the load reliability of a micro servo cylinder, characterized by: A micro servo electric cylinder load reliability test system according to any one of claims 1 to 7 is adopted, characterized in that it comprises the following steps: Step 1: Apply a set load to the telescopic end of the test object, and judge whether the initial stability of the test object meets the requirements based on the operating data under different load types, and screen out normal objects; Step 2: For normal objects, adjust the load in a step-by-step manner, and analyze the reliability of the load of normal objects based on the operating data; Step 3: Add a high-temperature test environment to the normal object that generates a strong reliability signal to evaluate the reliability attenuation of the normal object in the high-temperature environment.

Images